plastic mould and custom injection moulding tips

Plastic material identification Judging thermoplastics and thermosets: All thermosets have no softening process when heated or burned, only become brittle and coked; All thermoplastics, which are heated or burned, undergo a soft melting process , but different plastics burn. The phenomenon is different. pp PP burns slowly, the upper end of the flame is yellow, the middle is blue, there is a dripping drop, and after extinguishing the flame, there is a paraffin smell. The SAN burns slowly, the flame flashes, the yellow light, and the black smoke. When it is extinguished, there is a PS-like odor (smell). https://www.youtube.com/watch?v=_jYs-kv2tVY POM POM has medium flammability and continues to burn. The flame is pure blue, no charcoal flies, the plastic melts and turns black, and it has a very pungent smell of formaldehyde. Methacrylate is flammable and does not self-destruct after leaving the fire. The top of the flame is yellow, the bottom is blue, and there is a slight tail of...

Gas-assisted injection molding is an innovative technology developed on the traditional injection molding . GIM (Gas-assisted injection molding) was adopted in production  since 1980s. The gas-assisted injection molding system directly injects inert gas (usually nitrogen) into the melt plastic in the mold cavity through the sectional pressure control system, which makes the plastic part expand and cause hollowness, but still keeps the shape of the product surface. Gas-assisted injection molding can be regarded as a variant of hollow blow molding . The process of gas-assisted injection molding is to inject an accurately measured plastic melt which accounts for a certain proportion of the mold cavity. This process is called "short-shot-injection molding", and then directly inject a certain volume and pressure of high-pressure nitrogen into the molten plastic, and the gas diffuses along the direction of minimum resistance surrounded by the plastic melt. Because the plastic tem...

There are many classification for plastic injection molds . According to the basic injection mold gating system, it can be divided into three types: Two-plate mold; Three-plate mold; Hot runner mold, also called runner-less mold. Other plastic molds, such as side core pulling mechanism,  core-unscrewing  de-molding mechanism,  are evolved from these three types of molds.   Two-plate mold Two-plate mold or single parting surface mold is the simplest and most widely used mold in injection molding . The 2 plates mold are divided into two parts: the moving half and the fixed half by P/L. Core side is in the moving mold half and the cavity side is in the fixed mold half. The runner is in the fixed mold, and the main runner is arranged on the parting surface.  After molding, the injection molded product and runner remain in the moving mold half, the product and the injection system are ejected off from the same parting surface. And the movable mold half i...