How is plastic made?

Plastic is molded by casting, extruding, blow molding or injecting resin into a mold at a certain temperature and pressure.

Plastics are high molecular compounds polymerized by addition polymerization or polycondensation of monomers. Its deformation resistance is between fiber and rubber, and it is composed of synthetic resin, filler, plasticizer, stabilizer, lubricant, pigment and other additives.

The main component of plastic is resin. Resin refers to a polymer compound without various additives. The word resin was originally named after the lipids secreted by animals and plants, such as rosin and shellac. Resin accounts for about 40% ~ 100% of the total weight of plastics.

Injection characteristics of transparent plastics

PMMA has high viscosity and poor fluidity, so it must have high feed temperature and high injection pressure, and the influence of injection temperature is greater than injection pressure. The increase of injection pressure is beneficial to improve the shrinkage of products.

The injection temperature range is wide, the melting temperature is 65438 060℃, the decomposition temperature is 270℃, the feed temperature adjustment range is wide, and the process is good. Therefore, to improve the fluidity, we can start with the injection temperature, which has poor impact, poor wear resistance, easy to scratch and brittle crack. Therefore, we should increase the mold temperature and improve the condensation process to overcome these defects.