Injection molding cone surface joint guide mechanism The injection molding conical surface guide mechanism is a high-precision mold guide device that achieves precise alignment between the moving and fixed molds through the mating of conical surfaces. It is widely used in molds requiring high clamping accuracy, such as those used for precision gears and optical lenses. Compared to traditional guideMore

Pay attention to the relationship between injection and pressure holding Injection and holding pressure are two key stages in the injection molding process that are closely connected but have very different functions. Correctly distinguishing the relationship between the two is crucial to ensuring product quality. The injection stage is the process by which the melt fills the mold cavity throughMore

Reasons for installing exhaust system in injection mold Installing an exhaust system in an injection mold is a necessary measure to ensure product quality and smooth molding. Its core function is to exhaust the air in the cavity and the volatiles generated by the plastic melt. If the exhaust is poor, it will lead to a series of quality defectsMore

Typical structure of injection mold base The injection mold frame is the mold’s foundational framework, supporting and securing various functional components. Its typical structure consists of a fixed die plate, a fixed die plate, a movable die plate, a movable die plate, guide pins and bushings, and tie rods. These components are connected by screws to form a stable load-bearingMore

Cavity arrangement of injection molds The cavity arrangement of the injection mold is a key link in the design of multi-cavity molds. It directly affects the mold size, melt flow balance, molding efficiency and product quality. It needs to comprehensively consider the product structure, injection molding machine parameters and production needs for scientific planning. The core principle of cavity arrangementMore

Cooling of injection molds The injection mold’s cooling system is a key factor in determining molding efficiency and product quality. Its function is to quickly dissipate the heat released by the solidifying melt, allowing the product to cool and set within the specified time. Cooling time typically accounts for 50%-70% of the molding cycle. Optimizing the cooling system can shortenMore

The basic structure of injection mold The basic structure of an injection mold consists of six major systems: the molding component, the gating system, the guide mechanism, the ejection mechanism, the temperature control system, and the mold frame. These systems work together to complete the molding and demolding of the product. The molding component is the core part that directlyMore

Injection mold dimensional tolerances are a key parameter for ensuring product precision. They directly impact the product’s assembly performance and performance. They must be determined by comprehensively considering factors such as plastic shrinkage, product tolerance requirements, and mold manufacturing precision. Mold dimensional tolerances generally adhere to the “one-way deviation” principle: the cavity dimension takes a lower tolerance (to ensure theMore

Common problems and solutions during injection molding During the injection molding process, various quality issues are prone to occur due to factors such as raw materials, equipment, molds, and processes. Promptly identifying and resolving these issues is crucial to ensuring smooth production. Short shots are a common problem, manifesting as a product that does not fill the mold cavity andMore

Multi-stage machine adjustment method for serious overflow and whitening of injection molded parts When injection molded parts exhibit severe flash and whiteout, single parameter adjustments often fail to completely resolve the issue. A multi-stage tuning approach is required, systematically optimizing multiple steps from mold clamping, injection, holding pressure, to ejection, to systematically eliminate the defects. Stage 1: Optimize clamping parametersMore

CAE technology for injection molding CAE (Computer-Aided Engineering) technology for injection molding is an advanced technique that uses computer simulation software to numerically simulate the injection molding process. By establishing mathematical models to simulate melt flow, cooling, and pressure holding, it predicts potential defects during the molding process, thereby optimizing mold design and process parameters, reducing mold trial costs, andMore

Lubrication of injection units Lubrication of the injection molding machine is a crucial maintenance measure to ensure its proper operation and extend its service life. Moving parts within the injection molding machine, such as the screw, guide rails, and bearings, experience intense friction in high-speed, high-pressure environments. Poor lubrication can lead to increased component wear, increased resistance, increased energy consumption,More

The key component of the injection device – the barrel The barrel is the core component of the injection molding machine, responsible for plasticizing, melting, and conveying the plastic. Its structural design, material selection, and processing precision directly impact the plasticizing quality and production efficiency of the injection molding machine. The barrel’s primary function is to heat and melt solidMore

Effect of injection speed on melt filling Injection speed is a key parameter in determining melt filling quality during injection molding. It directly influences the melt’s flow pattern, pressure distribution, and temperature changes within the mold cavity, significantly impacting the product’s appearance, mechanical properties, and molding efficiency. When the injection speed is low, the melt flows more smoothly and laminarlyMore

Injection molded products and plastics used Injection molded products are various plastic parts produced through the injection molding process. They are widely used in the automotive, electronics, home appliances, medical device and other fields. Their structures are diverse, ranging from micro electronic connectors to car bumpers, and their performance requirements vary significantly depending on the application scenario. For example, automotiveMore

Design of straight-through cooling water channel for injection molding Injection molding straight-through cooling channels are the most common structure in mold cooling systems. They utilize straight holes machined into the mold plate or core as cooling medium channels, using circulating water or oil to remove mold heat and achieve uniform cavity temperature control. They are widely used in small andMore

In injection mold design, when the location of trapped air in the cavity is hidden or traditional exhaust grooves are difficult to effectively exhaust, installing inserts for exhaust at the trapped air locations is an efficient and flexible solution. This method installs inserts with exhaust functions in areas where trapped air is likely to occur (such as the bottom ofMore

Fixed mold demoulding driven by hydraulic cylinder Fixed mold demolding driven by a hydraulic cylinder is a flexible and efficient demolding method suitable for molds with undercuts on the fixed mold side, deep cavities, or products that easily stick to the fixed mold. Its core is to use a hydraulic cylinder to power the demolding mechanism (such as push platesMore

Different types of screws should be selected for different plastics The injection molding machine screw is the core component of the plasticizing system. Its structural parameters (such as aspect ratio, compression ratio, and screw groove depth) must match the characteristics of the plastic. The melt temperature, viscosity, and fluidity of different plastics vary significantly, so the corresponding screw type mustMore

Injection molding silver streaks (silver wire, material flowers) and solutions Injection molding silver streaks, also known as silver streaks or material smears, are white or silver streaks that appear on the surface of a product, severely impacting its appearance. Their formation is closely related to factors such as the raw material condition, process parameters, and mold design. Silver streaks canMore

Things that can easily cause overflow and whitening but are not easy to notice Flash and whiteout are common cosmetic defects in injection molding. Besides obvious causes like loose mold clamping and excessive ejection pressure, subtler details can also contribute, requiring a multi-faceted investigation. One often overlooked factor is improperly designed mold vents. Vents not only evacuate air from theMore

Calculation method of general molding dimensions for injection molding Calculating general injection molding dimensions is fundamental to ensuring product precision. Factors such as the plastic’s shrinkage, mold manufacturing tolerances, and the product’s operating environment must be comprehensively considered, adhering to the basic principle of “average shrinkage + tolerance allocation.” First, determining shrinkage is central to dimensional calculation. Shrinkage varies significantlyMore

Hydraulic – Single toggle clamping device The hydraulic single-toggle clamping mechanism is a key component in injection molding machines that combines the advantages of hydraulic drive and mechanical force amplification. Its core structure consists of a single toggle connecting rod, a clamping cylinder, a movable platen, and a fixed platen. It is widely used in small and medium-sized injection moldingMore

On-site treatment methods for light spots on matte surface injection molded parts Shining spots on matte-finished injection molded parts are a common defect that affects the appearance quality. They manifest as localized shine or uneven gloss. On-site treatment requires rapid investigation of the cause and targeted measures based on a combination of process parameters, mold conditions, and raw material characteristics.More

Assembly of injection mold core As the core molding component of the mold, the injection molding core’s assembly accuracy directly impacts the dimensional accuracy and surface quality of the finished product. The assembly process must adhere to strict procedures and specifications to ensure accurate core positioning and secure fixation. Pre-assembly preparation is essential for ensuring assembly quality. First, the coreMore

Air entrapment in the injection mold cavity is a common problem that affects product quality. Its location distribution is closely related to the mold structure, product shape, and melt flow path. Accurately determining the location of trapped air is a prerequisite for solving the problem. First, the dead corners or deep cavities of the product are high-incidence areas for trappedMore

Conventional structure of injection molded inclined slider The conventional structure of an injection molding slant slider is a common mechanism used in molds to form undercuts or oblique structures on the outside of the product. Its structure primarily consists of a slant slider, a guide runner, a wedge block, a positioning device, and a reset mechanism. These components work togetherMore

Working principle of injection molding inclined ejector mechanism The injection molding inclined ejector mechanism is a key mechanism in the mold for solving the problem of demoulding the inner undercut of the product. Its working principle is based on the synthesis and decomposition of mechanical motion. By converting the vertical motion of the ejection mechanism into the tilting motion ofMore

Injection molding inclined top, hydraulic inclined slider core pulling Injection molding inclined ejector and hydraulic inclined slider core pulling are two important core pulling methods used in molds for molded products with undercuts or complex structures. They are widely used in the production of complex products such as automotive parts and home appliance housings. Inclined ejector core pulling relies onMore

Design of injection molded wedge The design of the injection molding wedge block is the key to ensuring the stable position of the mold side core pulling mechanism during the injection molding process. It is mainly used to prevent the side core pulling slider from retreating or deflecting under the pressure of the plastic melt, ensuring the structural dimensional accuracyMore

Injection pressure-stabilizing mold clamping device The injection molding pressure-stabilizing clamping device is a core component of the injection molding machine. Its main function is to provide stable clamping force during the injection process, ensuring that the mold is tightly closed and preventing the plastic melt from overflowing from the parting surface. At the same time, it drives the mold toMore

Injection molding external pull plate fixed distance parting mechanism The external pull-plate spacing parting mechanism for injection molding is a crucial device for enabling the orderly opening of multiple parting surfaces in molds. It is widely used in molds with side core pulls, complex cavities, or those requiring sequential removal of runner slurry and finished product. Compared to internal pull-plateMore

Injection molding annealing treatment Injection molding annealing is a crucial step in eliminating internal stress and improving mechanical properties. It’s particularly suitable for transparent plastics like polycarbonate and polymethyl methacrylate, which are prone to internal stress. During the injection molding process, the plastic melt fills the mold at high speed and high pressure. During the cooling process, factors such asMore

Injection molding ejector plate demoulding mechanism The injection molding ejector plate demolding mechanism is a commonly used method for demolding products with deep cavities, thin walls, or complex shapes. It uses a single ejector plate to push the product from the core as a whole, resulting in uniform demolding force and a less prone to product deformation. The ejector plateMore

Injection molded push rod plate return spring The injection molding push rod plate return spring is a key component in the injection mold’s ejection system. Its primary function is to return the push rod plate to its initial position after ejection is complete, preparing for the next injection molding cycle. During the injection molding process, after the product has cooledMore

Injection molding drawing dimensions, title bar and modification bar As an important technical document for injection molding production, the dimension specifications of injection molding drawings directly affect the production accuracy and assembly performance of the products. Therefore, they must be accurate, clear and standardized. The dimension specification marking must include the key dimensions of the product, such as length, width,More

Preparation before transparent plastic injection molding Transparent plastic injection molding places extremely high demands on the production environment and material handling. Any minor impurities or operational errors can affect the product’s transparency and surface quality, so pre-molding preparations require meticulous attention to detail. First, material pretreatment is essential. Transparent plastics such as PMMA and PC easily absorb moisture from theMore

Issues that should be paid attention to in injection molding of transparent thick-walled plastic parts Transparent, thick-walled plastic parts face numerous challenges during the injection molding process. Not only must they exhibit excellent light transmittance, but they must also be free of internal defects such as bubbles, shrinkage cavities, and silver streaks, while also avoiding surface scratches or deformation toMore

Injection molding humidity control Injection molding humidity conditioning is a post-processing technique tailored to the specific characteristics of certain plastic materials. Its primary purpose is to adjust the performance of plastic parts, eliminate internal stresses, stabilize dimensional accuracy, and improve reliability by controlling ambient humidity and temperature. This treatment is particularly suitable for highly hygroscopic plastics such as polyamide (nylon),More

Injection molding machine adjustment skills: fast-first-slow-later injection method and its application During the injection molding process, injection speed control is one of the key factors affecting the quality of plastic parts. The fast-first, slow-later injection method, as a classic machine adjustment technique, plays an important role in solving the molding problems of complex structural plastic parts. This method involves usingMore

Injection molding process to improve dimensional accuracy of plastic parts Dimensional accuracy of plastic parts is a key indicator of injection molded product quality, directly impacting their assembly performance and reliability. Improving dimensional accuracy in the injection molding process involves multiple steps, including raw material selection, mold design, and process parameter optimization. These steps require coordinated effort to achieve preciseMore

Injection clamping force Injection clamping force is a critical parameter of an injection molding machine. It refers to the maximum clamping force applied by the machine’s clamping mechanism to the mold. Its magnitude is directly related to the stability of injection molding production and the quality of the molded part. During the injection molding process, the plastic melt fills theMore

Injection shrinkage voids, also known as vacuum bubbles, are a common defect in the injection molding process. These voids appear as holes inside or on the surface of a plastic part, severely impacting its mechanical properties and appearance. These voids are typically circular or oval in shape, hollow within, and may be surrounded by signs of stress concentration. Not onlyMore

Dimensional tolerances of plastic products The dimensional tolerance of plastic products refers to the maximum allowable deviation between the actual dimensions of a plastic product and its nominal design dimensions. It is a key indicator of the dimensional accuracy of plastic products and directly impacts the product’s assembly performance, usability, and appearance. Properly determining the dimensional tolerance of plastic productsMore

Plastic performance The performance of plastics refers to the various properties exhibited during use, directly impacting the applicability, reliability, and lifespan of plastic products. These properties include mechanical, thermal, chemical, electrical, and optical properties. Different plastics exhibit variations in these properties, enabling them to meet diverse application requirements. Understanding the performance of plastics is crucial for selecting appropriate plastic materials,More

Types and properties of plastics Plastics are materials primarily composed of high-molecular-weight polymers, processed and shaped with various additives. They come in a wide variety of types with diverse properties and are widely used in various fields, including industry, agriculture, and daily life. Plastics can be divided into two main categories: thermoplastics and thermosetting plastics, depending on how their propertiesMore

Plastic molding shrinkage The molding shrinkage of a plastic refers to the difference between the dimensions of a plastic part and the corresponding dimensions of the mold cavity, expressed as a percentage of the mold cavity dimensions, after the part has been removed from the mold and cooled to a stable state at room temperature. This characteristic is inherent toMore

Causes of air marks next to small bosses of plastic parts and machine adjustment techniques Air marks near small bosses on plastic parts are a common quality defect in injection molding. They not only affect the part’s appearance but can also weaken its structural strength, posing a hazard to product performance. Air marks typically appear as cloud-like or streaky marksMore

Common undercut structure and inclined top side core pulling of plastic parts In the design and production of plastic parts, undercut structures are common design elements that enable plastic parts to achieve specific functions or assembly requirements, but they also pose considerable challenges to mold design and molding. Common undercut structures include inner undercuts, outer undercuts, and local raised undercuts.More

Venting in areas with thin plastic walls but large areas Thin-walled, large areas of plastic parts (such as mobile phone casings and automotive dashboards) present challenging venting challenges during injection molding. These areas experience long melt flow distances and rapid cooling rates, making poor venting highly susceptible to defects such as bubbles, burning, and material shortages. Rapid, high-pressure melt fillingMore

Injection water hole center position and cavity pressure As a core component of the mold cooling system, the design of the injection molding water hole’s center position directly influences the mold temperature distribution, which in turn has a significant impact on the cavity pressure. The water hole center position refers to the distance between the water hole axis and theMore

Injection shrinkage marks are common surface defects on plastic parts, often appearing in areas of uneven wall thickness, at the base of ribs, or near the gate. These marks not only affect the product’s appearance but may also indicate stress concentration within the internal structure, reducing the part’s mechanical properties. These defects are caused by the lack of sufficient meltMore

Injection mold trial management Injection molding trials are a critical step in new product development or mold commissioning. Their purpose is to verify mold design rationality, determine optimal process parameters, and test whether the plastic part meets quality requirements, providing a reliable basis for mass production. Mold trial management involves the systematic planning, organization, coordination, and control of the entireMore

Factors affecting color instability in injection molding production Color instability in injection molding is a common problem that affects product appearance consistency. This manifests as noticeable color variations between molded parts within or across batches. This can negatively impact product aesthetics, or even lead to customer returns and financial losses. Numerous factors contribute to color instability, encompassing raw materials, equipment,More

Injection molding burn (carbonization) and solutions Injection burn (carbonization) is a common and serious defect in injection molding production. It manifests as black or brown scorch marks on the surface of the plastic part, which not only affects the product’s appearance but can also degrade mechanical properties and even generate toxic gases that harm the production environment. This defect oftenMore

Injection molding process of three commonly used transparent plastics Commonly used transparent plastics in injection molding include polymethyl methacrylate (PMMA), polycarbonate (PC), and polystyrene (PS), each with unique properties and injection molding process requirements. PMMA, commonly known as organic glass, offers excellent light transmittance and weather resistance, but its heat resistance and impact strength are relatively low. When injection moldingMore

Pneumatic demoulding for soft plastic injection molding Pneumatic demolding for injection molding soft rubber is a highly efficient demolding method developed for soft plastic products (such as silicone, TPU, and EVA). It utilizes compressed air pressure to eject the soft rubber product from the mold cavity, avoiding the damage that traditional mechanical demolding can cause. Soft rubber products typically exhibitMore

Crystallization characteristics of thermoplastics The crystallization characteristics of thermoplastics are one of their most important physical properties, directly affecting their mechanical, thermal, and processing capabilities. During the molding process, the molecular chains of crystalline thermoplastics gradually align from a disordered molten state into an ordered crystalline structure. This process is called crystallization. The degree of crystallinity and the integrity ofMore

Injection hot injection nozzle classification As a key component of the hot runner system, there are many types of injection molding hot nozzles. Different types of hot nozzles are suitable for different injection molding scenarios and material properties. According to the structural form, injection molding hot nozzles can be divided into two categories: open hot nozzles and needle valve hotMore

Key points for using hot runner injection molds As an advanced injection molding machine, the correct use of hot runner injection molds is crucial for ensuring production efficiency and product quality. Before use, the hot runner system must be thoroughly inspected, including the integrity of components such as the hot runner plate, hot nozzle, heating elements, and temperature sensors. TheMore

While hot runner systems can improve efficiency and product quality in injection molding, they can also cause air entrapment due to improper design or operation. Air entrapment typically manifests as defects such as scorching, bubbles, and missing material on the surface of the plastic part, and in severe cases, can even lead to mold damage. One of the main causesMore

Injection hot runner plate outlet groove In injection molding hot runner systems, the design of the hot runner plate’s wire troughs is a crucial component in ensuring proper system operation. Their primary function is to provide wiring pathways for electrical components such as heating elements and temperature sensors on the hot runner plate, protecting wires from high temperatures, high pressures,More

Determine the gate type for injection molding In injection molding, determining the gate type is a critical step in mold design, directly impacting part quality, production efficiency, and mold manufacturing costs. As the channel connecting the runner and cavity, the gate’s primary function is to control the melt’s flow rate, filling time, and pressure loss. It also ensures timely coolingMore

Injection molding forced demoulding Forced demolding in injection molding is a demolding method used under specific conditions. It is mainly suitable for plastic parts with relatively simple structures and a certain degree of elasticity and plasticity. In particular, when the undercut or raised portion of the plastic part is small, demolding is achieved by utilizing the elastic deformation of theMore

Application experience of the sliding mechanism of the front mold of injection molding The front mold slide mechanism for injection molding is an important device for solving the problem of demolding complex plastic parts. It is especially suitable for the production of plastic parts with complex structures such as undercuts and bosses. Compared with the rear mold slide, the frontMore

The main parameters involved in the gas-assisted injection molding process As an advanced injection molding technology, the gas-assisted injection molding process eliminates sink marks, reduces the weight of plastic parts, and shortens the molding cycle by injecting high-pressure gas into the melt. The core of this process lies in the precise control of various parameters, of which the gas injectionMore

Injection molding peeling and solutions Injection molding peeling is a common quality defect in production, manifesting as delamination and flaking on the surface of plastic parts. This not only affects the product’s appearance but can also weaken its mechanical properties. This problem often occurs during the production of thin-walled plastic parts or complex structures, and is particularly pronounced when aMore

Injection nozzle leakage and solution Injection nozzle leakage is a common problem in injection molding production. It occurs when melt leaks from the gap between the nozzle and the mold’s sprue bushing during the injection or pressure-holding phases. This not only wastes raw materials but also leads to defects such as missing material and flash in the molded parts. InMore

Injection molding jet cooling water channel Injection molding jet cooling channels are a highly efficient mold cooling structure. They deliver high-pressure coolant (usually water or oil) directly to the mold cavity surface in a jet-like manner, significantly improving heat transfer efficiency and shortening cooling time. They are particularly suitable for deep-cavity, thin-walled, or complex-shaped plastic parts. Compared with traditional through-coolingMore

Injection molding layout is a key step in mold design, determining the number and arrangement of cavities. It directly impacts mold size, molding efficiency, and consistent part quality. Scientifically and rationally planning maximizes mold space utilization, reduces production costs, and facilitates mold manufacturing and maintenance while ensuring part precision. Planning must adhere to the four principles of balance, economy, processMore

Excessive internal stress in injection molding and its solution Injection molding internal stress is generated during the molding process due to molecular orientation and uneven cooling. Excessive internal stress can lead to defects such as cracking, warping, and dimensional instability in the part, and can even cause failure due to stress release during use. Internal stress is primarily categorized asMore

Injection molded hexagon socket screw assembly drawing and specifications Injection molding hexagon socket screws are key fasteners in mold assembly, used to connect mold plates, secure parts, and transfer loads. The preparation of assembly drawings and the selection of specifications and dimensions directly impact the mold’s connection strength and stability. Hexagon socket screws, characterized by their small wrench space andMore

Injection mold drawing The drawing of an injection mold is the final presentation of the mold design process and the core technical document guiding mold manufacturing, assembly, and inspection. Its standardization and accuracy directly determine the mold’s production quality and efficiency. A complete set of injection mold drawings, including 2D engineering drawings and 3D models, must clearly express the mold’sMore

Management of Injection Mold Design Drawings The management of injection mold design drawings is a core component of the entire mold production lifecycle, encompassing processes such as drawing, review, archiving, version control, and distribution. The degree of standardization directly impacts mold design quality, manufacturing efficiency, and ease of subsequent maintenance. A complete set of mold design drawings includes assembly drawings,More

Life of injection molds The lifespan of an injection mold is a crucial indicator of mold performance. It refers to the number of parts a mold can produce while ensuring quality. Its length directly impacts production costs and efficiency. Mold life is typically divided into sharpening life and total lifespan. The sharpening life refers to the number of parts aMore

Insulation of injection molds Insulation of injection molds is crucial for improving injection molding efficiency and ensuring consistent part quality. Its core purpose is to reduce heat loss during the molding process, maintaining stable cavity and core temperatures, thereby reducing energy consumption and shortening the molding cycle. During mold operation, the cavity surface must maintain a certain temperature (typically 50-120°C,More

Conical surface positioning of injection mold plate Conical surface positioning of injection molding templates is a key technology for ensuring precise alignment between the movable and fixed molds during mold closing. The conical surface structure on the template achieves both radial and axial positioning, significantly improving mold closing accuracy and reducing problems such as cavity wear and part flash causedMore

Thread automatic demoulding mechanism The threaded automatic demolding mechanism is a core component in the automated production of threaded plastic parts. It automatically rotates the threaded core or cavity and ejects the plastic part during the mold opening process, eliminating the need for manual intervention. This significantly improves production efficiency and reduces labor costs. This mechanism is widely used inMore

The demolding mechanism for threaded plastic parts is a key component in injection mold design. Its function is to smoothly remove plastic parts with internal or external threads from the mold cavity or core while maintaining the integrity and precision of the threads. Due to the helical nature of the thread structure, traditional linear ejection methods cannot be used forMore

Injection position of injection screw The injection molding screw’s ejection position is a key process parameter determining part quality. This refers to the screw’s position at the front end during the injection phase, directly impacting the melt fill rate, pressure retention, and part weight stability. The ejection position should be determined based on the part’s volume, the runner system’s capacity,More

Dimensioning requirements for injection molded parts Dimensioning of injection molded parts is a crucial bridge between design and production. Its standardization directly impacts mold manufacturing accuracy and part assembly performance. Dimensioning must balance design intent, process feasibility, and ease of testing, adhering to the principles of clarity, completeness, and rationality. Compared to mechanical parts, dimensioning of injection molded parts requiresMore

Injection molded connecting rod reset mechanism The injection molding link pre-reset mechanism is a key device in mold design, ensuring the ejector system resets before mold closing. Its core function is to prevent ejector components such as ejectors and lifters from colliding with the cavity and core, thereby protecting mold precision and extending mold life. In complex molds, when thereMore

Use the pulling rod to pull off the nozzle material mechanism The sprue slug-breaking mechanism, which utilizes a pull rod, is a crucial device in injection molds for automatically separating the plastic part from the sprue material. This significantly improves production automation, reduces manual labor, and lowers production costs. This mechanism uses the pull rod’s pulling force on the sprueMore

Injection molding cooling water channel accessories Injection molding cooling water channel accessories are a crucial component of the mold cooling system. Their performance and quality directly impact the cooling medium’s circulation efficiency and cooling effectiveness, which in turn affects the molding quality and production efficiency of plastic parts. There are many types of cooling water channel accessories, including water pipeMore

Calculation of volume flow rate of injection molding cooling medium Calculating the volume flow rate of injection molding coolant is a key step in mold cooling system design, directly impacting cooling efficiency and part quality. Insufficient flow of the coolant (usually water or oil) results in slow cooling and uneven cooling of the part, leading to defects such as warpingMore

Injection molding cold glue residue and solution Cold glue residue is a common defect in injection molding. It occurs when the melt solidifies in the runner, gate, or cavity due to excessive cooling during the injection molding process, forming residual cold glue. This not only affects the appearance quality of the plastic part but can also cause problems such asMore

Preparation work before starting injection molding Preparatory work before starting the injection molding machine is crucial for ensuring smooth production and product quality. This includes equipment inspection, raw material preparation, mold installation, and other aspects, requiring meticulous attention to detail. First, the operator must conduct a comprehensive inspection of the injection molding machine, including ensuring that the power supply voltageMore

Precision injection molds are core equipment for the production of high-precision plastic products. Their design and manufacturing directly determine product quality and production efficiency. Compared to conventional injection molds, precision injection molds have more stringent requirements in terms of dimensional accuracy, surface roughness, and structural stability. For example, for precision plastic parts used in electronic connectors, medical devices, and otherMore

Injection molded fastening screws Injection molding fastening screws are essential standard components for mold assembly and plastic part connection. They secure mold components (such as the mold plate, core, cavity, guide pins and sleeves) together or serve as a secure anchor for later assembly of plastic parts. Their selection and use directly impact the mold’s structural stability and the reliabilityMore

A machine adjustment method to solve the problem of gas entrapment caused by melt backflow Air entrapment caused by melt backflow is a complex defect caused by a sudden change in the melt flow direction during injection molding. It manifests as bubbles or scorch marks inside or on the surface of the plastic part, or a loose structure is formedMore

Injection hinge reset mechanism The pre-reset mechanism for injection molding hinges is a key device that ensures the smooth demolding of hinged plastic parts. Its core function is to reset the hinge core or slider before other molded parts during the mold closing process, avoiding mold damage or part deformation due to interference. Hinge structures are often used in clamshellMore

General requirements for injection molding gating systems The injection molding gating system, the melt channel connecting the injection molding machine nozzle to the mold cavity, must be designed to meet the overall requirements of “full filling, smooth flow, retention, and clean discharge.” Specifically, this means ensuring that the plastic melt completely fills the mold cavity, flows smoothly and without turbulence,More

Location of injection gate The selection of injection molding gate location is a critical step in mold design that determines the quality of plastic parts. It directly affects the plastic melt’s filling path, pressure distribution, pressure holding effect, and residual stress. A reasonable gate location can significantly reduce defects such as warping, sink marks, and weld marks. The gate locationMore

Injection molded rib exhaust Injection molding ribs, a key design element for enhancing the structural strength of plastic parts, are often in the form of narrow strips or grids. These ribs are prone to defects such as bubbles, burning, and insufficient filling during the molding process due to poor venting. The thickness of the ribs is typically 0.5-0.7 times theMore

Injection molding of springs between movable plates The springs between the movable plates in injection molding are key elastic components used in molds to achieve functions such as resetting, buffering, and pre-tightening the plates. They are widely used in ejector mechanisms, core-pulling mechanisms, and parting surface control. As components that can move relative to each other in the mold, theMore

Lateral core pulling mechanism of slider bending pin The lateral core-pulling mechanism of a slider and bent pin is a crucial device for lateral molding and demolding of plastic parts in injection molds. It utilizes the inclined surface of the bent pin to drive the slider’s lateral movement, completing the core-pulling and reset actions. It is widely used in theMore

The injection molding slider locating beads are key components that ensure the precise positioning of the mold slider after mold opening. The rationality of their design directly affects the operational stability of the mold and the molding accuracy of the plastic part. In injection molds, sliders are often used to mold side holes, side recesses, and other structures of plasticMore

Adjustment of injection molded sliding feet (vibration damping pads) The injection molding shoe (vibration damping pad) is a key component installed at the bottom of the injection molding machine. Its main function is to support the equipment, adjust the machine body level, and reduce vibration and noise. The accuracy of its adjustment directly affects the operating stability of the injectionMore

Injection Molding Black Lines (Black Stripes) and Solutions Injection molding black streaks are a common surface defect on plastic parts. These streaks appear as black lines or spots along the plastic’s flow direction, affecting not only the part’s appearance but also its mechanical properties. In applications requiring high aesthetic standards, such as automotive interiors and appliance housings, black streaks canMore

Non-national standard plastic mold steel sold in the domestic market Non-GBP plastic mold steel circulating in the domestic market refers to steel products that fail to meet national standards (such as GB/T 1299-2014 “Tool and Die Steel”). These products exhibit significant fluctuations in composition, mechanical properties, and processing performance, posing numerous risks to injection mold manufacturing. This type of steelMore

Some Experiences in Improving the Quality of Injection Molded Products Strict control of raw materials is fundamental to improving the quality of injection molded products. The purity, particle size distribution, and moisture content of plastic particles directly impact the molding process and the performance of plastic parts, so a comprehensive raw material inspection process must be established. For example, eachMore

Process principles and characteristics The core principle of the injection molding process is to utilize the thermoplastic properties of plastics. After heating and melting solid plastic particles, the molten plastic is injected into the mold cavity at high pressure through the screw of the injection molding machine. After cooling and solidification, the plastic part is produced in the same shapeMore

Spacer type cooling water channel In injection mold cooling system design, septum-type cooling channels are widely used in the molding of complex plastic parts due to their efficient heat dissipation capabilities. Traditional straight-through cooling channels struggle to adapt to the curved surfaces or deep cavities of irregularly shaped plastic parts, resulting in uneven cooling. Septum-type cooling channels, however, employ septumsMore

Molecular structure and aggregation state of polymers The properties of polymers are closely related to their molecular structure and aggregation state. Molecular structure determines the basic properties of polymers, while aggregation state is the spatial arrangement of molecular chains, which directly affects the physical and processing properties of polymers. The molecular structure of a polymer includes the chemical composition, molecularMore

Changing the wall thickness of different parts of the plastic part Plastic part wall thickness is a crucial parameter in injection molding design, directly impacting the part’s mechanical properties, molding process, and appearance. Improperly designed variations in wall thickness can easily lead to defects such as sink marks, bubbles, and warping. Therefore, properly adjusting the wall thickness of different partsMore

In the injection molding process, auxiliary runners serve as a critical structure connecting the main runners to the mold cavity. Their design directly impacts the mold quality and production efficiency of the plastic part. The auxiliary runners’ primary function is to smoothly and evenly deliver the molten plastic to each cavity, while also taking into account factors such as pressureMore

Injection parting surface positioning Injection molding parting surface positioning is a critical step in mold design. Its role is to ensure accurate alignment between the movable and fixed molds during mold closing, guaranteeing the dimensional accuracy of the cavity and the quality of the molded part. Inadequate parting surface positioning accuracy can lead to defects such as flash, dimensional deviations,More

Cross-section design of injection molding runners Injection runners are crucial channels connecting the main runner and the gate. Their cross-sectional design directly impacts the melt’s flow properties, pressure loss, cooling rate, and raw material consumption. A reasonable cross-sectional shape and size can significantly improve injection molding efficiency and part quality. The cross-sectional design of the runner must comprehensively consider factorsMore

Injection Molded Square Guide Pillar Design Injection molding square guide pins are crucial components in mold guide systems. Compared to round guide pins, their unique square structure provides more stable guidance, particularly when withstanding lateral forces. They are widely used in large and precision molds, as well as molds requiring anti-rotation features. The design quality of square guide pins directlyMore

Second plate formwork automatic pouring cut-off mechanism The two-platen automatic gate-off mechanism is a key feature in achieving runner-less or low-runner injection molding. By automatically severing the connection between the gate and the part during mold opening, it eliminates the need for manual gate trimming and significantly improves production efficiency and part quality. This mechanism is particularly suitable for mass-producedMore

Process principle of multi-stage injection molding The multi-stage injection molding process achieves high-quality molding of complex plastic parts by dividing the injection process into multiple stages and precisely controlling parameters such as injection speed, pressure, and holding pressure in each stage. This process overcomes the limitations of traditional single-stage injection, which struggles to balance filling speed and pressure. It canMore

Composite demoulding of movable mold push plate and movable mold push rod The combined ejection mechanism of a movable mold plate and ejector rod is a highly efficient demolding solution designed for complex plastic parts. Through the coordinated action of the ejector plate and ejector rod, it solves the demolding challenges of deep-cavity, thin-walled, and multi-ribbed parts, which are difficultMore

Define the parameters of the injection molding machine Defining injection molding machine parameters is fundamental to ensuring smooth production and part quality. These parameters encompass every aspect of the process, including the injection system, mold clamping system, hydraulic system, and temperature control system. Each parameter has a specific meaning and function and must be precisely set based on the part’sMore

Fixed mold demoulding design Fixed mold release design is a crucial step in injection mold design. It addresses the potential for plastic parts to adhere to the fixed mold after molding. Through rational mechanical design, the plastic part can be smoothly ejected from the fixed mold, avoiding deformation, scratches, or mold damage caused by poor demolding. Fixed mold release designMore

The fixed-distance parting mechanism is a key device in injection molds, controlling the mold parting sequence and distance. It is widely used in the molding of parts with complex cores, undercuts, or parts that require core extraction before parting. Its core function is to open the mold in stages according to a preset sequence during the mold opening process, preciselyMore

Selection of injection molding guide pin diameter Injection molding guide pins serve as guiding components within the mold. Their diameter directly impacts mold opening and closing precision, motion smoothness, and service life. Guide pins primarily ensure accurate positioning of the movable and fixed molds during mold closing, prevent collision between the core and cavity, and withstand lateral forces generated duringMore

Single-cylinder direct pressure mold clamping device The single-cylinder direct-pressure clamping mechanism is a core component for closing and locking the mold in injection molding machines. Using a single hydraulic cylinder to directly provide clamping force, it features a simple structure, rapid response, and high clamping accuracy. It is widely used in small and medium-sized injection molding machines and precision moldingMore

Different sized cavities use different sized gates In the design of multi-cavity injection molds, when there are differences in cavity size, using gates of different sizes is a key measure to ensure uniform quality of plastic parts in each cavity. The gate is the key part connecting the runner and the cavity, and its size directly affects the melt fillingMore

Roughness expression method and meaning Surface roughness, a geometric parameter that describes the microscopic unevenness of an object’s surface, is of great significance in fields such as mechanical manufacturing, mold design, and product testing. Its value directly affects the fit, wear resistance, sealing, and appearance of parts. Roughness can be expressed using parameter symbols, numerical notations, and graphical symbols. DifferentMore

Calculation of demoulding force during core pulling During the injection molding process, calculating the ejection force during the core pulling process is a critical step in mold design. Its value directly determines the driving force of the core pulling mechanism, component strength, and the selection of the power source. The ejection force refers to the force required to extract theMore

Rack and pinion arc core pulling mechanism The rack-and-pinion arc core-pulling mechanism is a key device in injection molds, used to solve the demolding problem of plastic products with arc-shaped lateral protrusions or depressions. Through the meshing transmission of the gear and rack, it converts linear motion into circular motion, enabling precise core extraction. It is widely used in theMore

Injection molding size deviation and solution Injection molding dimensional deviations refer to deviations between the actual dimensions of a plastic product and its designed dimensions that exceed the allowable range. This is a common quality defect in injection molding production. These deviations not only affect the assembly performance and functionality of plastic products but, in severe cases, can also leadMore

Surface roughness of injection molded parts The surface roughness of injection-molded parts is a key indicator of mold quality and plastic product performance. It directly impacts the appearance, performance, and lifespan of plastic products. Surface roughness refers to the microscopic irregularities on the mold cavity and core surfaces. Its magnitude is determined by a variety of factors, including mold processingMore

Assembly of injection molded struts As a crucial support component in the mold structure, injection molding stays are primarily used to enhance the rigidity of the mold cavity or core, preventing deformation caused by excessive melt pressure during the injection molding process, which can affect the dimensional accuracy and surface quality of the plastic product. The quality of their assemblyMore

Thermal diffusivity, heat transfer coefficient, specific heat capacity and density of common plastics Plastics are widely used in modern industry. Their thermal properties, such as thermal diffusivity, heat transfer coefficient, specific heat capacity, and density, have a crucial impact on the molding process and performance of plastic products. Understanding these parameters can help engineers optimize the injection molding process andMore

Models of commonly used travel switches for injection molding In the automated operation of injection molding machines, limit switches play a crucial role. They precisely detect and control various actions, such as mold opening and closing, ejection, and core pulling, ensuring stable operation according to pre-programmed procedures, thereby guaranteeing the molding quality and production efficiency of plastic products. Numerous typesMore

Types of injection molding side core pulling mechanisms In the injection molding process, when plastic products contain lateral holes, lateral bosses, or lateral grooves, they must rely on a lateral core pulling mechanism to achieve demolding. The proper selection of a lateral core pulling mechanism has a crucial impact on the molding quality, production efficiency, and mold life of theMore

Irregular Injection Molding Sinks and Solutions Irregular injection molding pits are a common surface defect on products. These irregularly shaped depressions not only affect the product’s appearance but can also weaken its structural strength, leading to breakage and other issues during use. The occurrence of these pits is related to a variety of factors, including raw material properties, the injectionMore

Selection of surface roughness values for injection molding The surface roughness of injection-molded products is a key indicator of surface quality. It not only impacts the product’s aesthetics but also significantly influences its performance, assembly accuracy, and wear resistance. Choosing the optimal surface roughness value requires comprehensive consideration of factors such as the product’s application scenario, functional requirements, material properties,More

Injection molding glue is not strong and solution Injection molding combines two different plastic materials through the injection molding process to create products with specific functions and appearances. These products are widely used in electronics, automotive, and daily necessities. However, a weak overmolding is a common quality issue in this process. This can manifest as delamination and shedding between theMore

Injection molding eight-shaped rocker secondary demoulding mechanism During the injection molding process, complex products with deep cavities, undercuts, or thin walls often face difficulty removing them from the mold in a single demolding operation, potentially leading to deformation and damage. The figure-eight swing lever secondary demolding mechanism is a highly effective demolding solution. By utilizing the swing lever’s unique motionMore

Solutions to the problem of gate air marks in PC injection molded parts PC materials, due to their excellent mechanical properties, heat resistance, and transparency, are widely used in electronics, automotive, medical devices, and other fields. However, during the PC injection molding process, gate air marks are a common quality defect. These marks appear as cloud-like or silvery lines nearMore

During the K-material injection molding process, ejector pin breakage is a common production problem, impacting not only production efficiency but also potentially leading to product scrap and increased production costs. K-material, a styrene-butadiene copolymer, exhibits excellent transparency and toughness. However, during injection molding, its melt flow and cooling shrinkage characteristics can exert significant stress on the ejector pins, making itMore