The performance of the material is closely related to the injection molding conditions and the quality of the product.

Most of the injection molding materials are granular, and when these solid materials are loaded into the hopper, they generally need to be preheated first, remove moisture, and then go through the compression transport and plasticization of the screw, and they need to go through a long thermal process in the material

The screw is pushed into the mold cavity, and then cooled through the pressure holding stage.

The main factors that affect this process are material, temperature, cylinder temperature, mold filling pressure, speed. The processing properties of polymer materials, the internal structure of the molecular chain, the molecular weight size and its distribution, but also depends on the polymer

External structure. The manufacturability of injection molding is closely related to the relative density of polymer materials, thermal conductivity, specific heat capacity, glass transition and crystallization temperature, melting, decomposition temperature, and mechanical properties and rheological properties displayed in processing.

General physical properties

1. Total heat capacity

The total heat capacity refers to the total heat capacity of the injection molding material at the injection molding process temperature.

2, melting heat

Heat of fusion, also known as latent heat of fusion, is the energy required by crystalline polymers to form or melt crystals. This part of the energy is used to melt the crystalline structure of the polymer, so the injection of the product type polymer is more than the injection of the amorphous material

More energy is required to reach the specified melting temperature. No latent heat of melting is required for amorphous polymers. It takes about 452/g (100.8ca1/8) to make POM reach the injection molding temperature, and PS only needs 375d/g to melt.

3. Specific heat capacity

Specific heat capacity is the heat