plastic mould and custom injection moulding tips

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 caused by contact with the "cold" mold surface. https://www.youtube.com/watch?v=QGq0YxrIHPs Hot runner molds have been successfully used to shoot various plastic materials . Almost all plastic materials that can be shot with cold runner molds can be processed with hot runner molds. The minimum injection parts are less than 0.1g, and the maximum injection parts are more than 30kg. Hot runner molds are widely used in electronics, automobiles, medical, daily necessities, toys, packaging, construction, office equipment and etc., industries The most important two technical factors: The control of plastic temperature; The control of plastic flow. A typic...

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 can make the plastic parts show regular patterns or irregular patterns, so as to improve the practicability and aesthetics . Compared with traditional injection molding, two-color injection molding has the following advantages: the two-color mold can inject two resins with different characteristics and colors into a single two-color product, which can reduce the assembly and post-treatment of molded products. The printing cost is saved, and increase the beautiful visual effect of the product . Two-color injection molding not only has the function of anti-slip and friction-increase, but the flexible resin material makes it more ergonomic and feels better. The quality of the two-color injection molding product is high,...

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 that of PS and ABS. The melt viscosity is sensitive to temperature changes. In the molding process, the melt viscosity is changed mainly from the injection temperature. https://www.youtube.com/watch?v=5PHkIec5_X0 PMMA is an amorphous polymer with a melting temperature of more than 160 ° C and a decomposition temperature of 270 ° C. DRYING PMMA has a certain degree of water absorption, which reaches 0.3-0.4%, while injection molding must have a humidity below 0.1%, usually 0.04%. The presence of water causes bubbles, streaks, and reduced transparency in the melt. Therefore, drying treatment is required. The drying temperature is 80-90 DEG C wi...

The problem of sink marks 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 mark 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. Among the plastic raw materials, due to the rapid cooling rate, the abnormal sink problem of the PC injection  molding is the most difficult to solve, and the abnormal sink problem of  PP material is also difficult to handle also. Therefore, when encountering thick and large plastic part injection problems, it is necessary to take some unconventional injection molding techniques, otherwise it will be difficult to deal with. [caption id="attachment_3644" align="aligncenter" width="635"] different wall thickness[/caption] Here is some effective techniques to deal with the  problems of this inject...