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  Injection molding is a cycle process, each cycle mainly includes: quantitative feeding - melting and plasticizing - pressure injection - mold filling and cooling - mold opening and parts removal. And then take out the plastic parts and then close the mold for the next cycle.   1. Thermoplastics are commonly used in rubber injection molding   The resin molecular chains in thermoplastics are linear or branched. There is no chemical bond between the molecular chains. When heated, they soften and flow. The process of cooling and hardening is physical change. Therefore, injection molding is suitable for almost all thermoplastics. Nylon (nylon), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile butadiene styrene (ABS), polystyrene (PS), Polyoxymethylene (POM), polycarbonate (PC), polyurethane (PU), polytetrafluoroethylene (PTFE) are all thermoplastic injection materials, and they are common plastics for injection molding .   2. Why are most t...

  W hat are the common design rules in plastic design ?   The following is a description of the key points of the plastic product structure design   The structural design of plastic product development should follow the following principles:   a. The structure design should be reasonable: the assembly gap is reasonable, and all plug-in structures should be reserved for gaps; ensure sufficient strength and rigidity (safety test), and properly design a reasonable safety factor.   b. The structural design of plastic parts should comprehensively consider the manufacturability of the mold, and simplify the manufacturing of the mold as much as possible.   c. The plasticity of the structure of plastic parts should be considered, that is, the injection molding production efficiency of the custom plastic injection molding companies should be high, and the rejection rate of injection molding should be minimized.   d. Consider facilitating assembly production (es...

  P lastic I njection M oulding A dvantages and D isadvantages   Compression molding is the operation of first putting powdered, granular, or fibrous plastic into the mold cavity at the molding temperature, and then closing the mold to press to shape and solidify it. C ompression moulding method  can be used for thermosetting plastics, thermoplastics, and rubber materials.   Advantages of injection moulding over compression moulding (1) In the custom plastic compression moulding process, the loss of raw materials is small and will not cause too much loss (usually 2% to 5% of product quality).   (2) The internal stress of the product is very low, and the warpage deformation is also small, and the mechanical properties are relatively stable.   (3) The wear of the mold cavity is small, and the maintenance cost of the mold is low.   (4) The cost of molding equipment is low, and its mold structure is simpler, and its manufacturing cost is usually lower than...

  I njection M olding D efects and S olutions In the daily production of modified plastic injection molding, some problems are likely to occur. The more common defects mainly include dark spots, gloss differences, and surface wrinkles (also known as orange peel). Generally speaking, these defects are often Occurs near the gate, so today we will analyze the causes of the defects from the mold and molding process.   Gloss difference   For injection molding plastic products, the difference in gloss on the surface of the textured product is most obvious. Even if the surface of the mold is very uniform, an irregular gloss may appear on the product. That is to say, the mold surface effect of some parts of the product is not well reproduced.   As the distance of the melt from the gate gradually increases, the injection pressure of the melt gradually decreases. If the distal end of the gate of the product cannot be filled, the pressure there is the lowest, so that the textur...

  Nowadays, the trend of processing technology is developing with high and new technology. These technologies include micro injection molding, high filling compound injection, water assisted injection molding, mixing and using various special injection molding processes, foam injection molding, mold technology, simulation technology and so on.   The injection manufacturing process  mainly includes four stages: filling, pressure maintaining, cooling and demoulding. These four stages directly determine the quality of the products. It is a complete continuous process.   1. Filling stage   Filling is the first step in the whole process of injection manufacturing process, from the beginning of injection molding when the mold is closed to about 95% of the mold cavity filling. Theoretically, the shorter the filling time is, the higher the molding efficiency is. But in practice, the molding time or injection speed is restricted by many conditions.   2. Pressure mai...