Hot runner system can be seen as an extension of injection molding machinery. The function of the hot runner system is to thermally insulated to send the thermoplastic melt to the plastic mold. The hot runner can be heated independently while it is thermally insulated in the injection mold, which can compensate for heat loss …
The Difference between insert molding and Double Color molding The so-called two-color injection molding refers to the molding method of injecting two kinds of plastics with different colors into the same mold. It can make the plastic parts with two different colors, and it can make the plastic parts show regular patterns or irregular patterns, …
Acrylic is also called polymethyl methacrylate (PMMA). Due to the defects , such as low surface hardness, easy scratching, low impact resistance and poor molding fluidity, the modification of PMMA appears alot. Such as copolymerization of methyl methacrylate with styrene and butadiene, mixing of PMMA with PC, etc. The flow of PMMA is worse than …
The problem of shrinkage of plastic injection parts (surface shrinkage and internal shrinkage) is due to the insufficient melt replenishment when the thick part is cooled. We often encounter these sink problems, no matter how to increase the pressure, increase the water lines numbers,and extend the time of the injection, the shrinkage problem is unsolvable. …
The plastic mold can be viewed as an exchanger that carries the heat of the hot melt away from the plastic mold by the circulating refrigerant. The role of the cooling system 1. Improve productivity 2. Ensure the effective of a mold In the whole cycle of thermoplastic injection molding, the mold cooling time accounts …
If the plastic parts are unevenly shrink-ed, the internal stress distribution will be uneven. If the stress exceeds the rigidity of the plastic part, the warpage and deformation of the plastic part will be found, which will affect the dimensional stability of the plastic part. But what is warpage? When internal stress (due to uneven …
In plastic injection molding, the temperature of the melt in the cavity is generally between 200 and 300 degree, the melt is formed in the cavity, cooled, and solidified into a product profile. When the injection molded product is taken out of the mold, the temperature is generally 60 degree about, the heat released by …
PET chemical name is polyethylene terephthalate, also known as polyester. At present, GF-PET is the most used among customers, mainly for preform injection. The rheology of PET in molten state is better, and the effect of pressure on viscosity is greater than temperature. Therefore, the fluidity of the melt is mainly affected by pressure. Plastic …
In a sense, the injection mold is also a displacement device where the hot plastic melt enters into the mold cavity while displaces the air in the mold cavity. In fact, the air in the mold is not limited to the cavity, especially the three-plate injection mold, and the air existing in the flow path …
Transparent parts have their special characteristics and functionality. The poly-carbonate injection molding will inevitably be used for auto part. When injection molding, we often encounter some thick-walled transparent injection molded parts. For performance reasons, these plastic parts are made of PC. When the average wall thickness exceeds 6mm and the MAX wall thickness is more …