Why should I granulate before injection? What's the advantage of granulation?
The process of granulation is to rearrange the structure of the plastic by melting, and the injection is exactly the same. No change in physical properties. Their relationship is upstream and downstream, not tied together. Granulation in order to facilitate injection molding.
Direct crushing material can also be used, but the direct crushing of the material due to uneven particle size, resulting in uneven storage process, the process becomes more unstable. And granulation, the particles are generally more homogeneous, and later injection molding process is relatively stable! As for the difference between granulation and injection: This is the two process, granulation is a number of waste plastics through melting, extrusion, in the cutting machine to cut into granular. During the granulation process, some additives can be added to improve the performance of waste plastics. Something like a toughening agent. Plastic injection is the formation of plastic products by melting the plastic material and then by pressing it into the mold. Popular to say is: injection molding is the raw material into plastic products, and granulation is to make plastic products again "raw material""!
The material should be added with color or some additives, and it will not be fully uniform in the injection machine screw after manual mixing, which will lead to problems of color, flower or other material performance. Secondly, the broken material also particles broken and broken sheet (bottle), the particle breakage has little effect on sheet material broken because the density is too low, the injection molding machine in storage screw is easy to slip, the injection molding process is affected. Of course, if the product requirements are not high, as long as the broken material does not affect the injection, you can use the broken material.
The purpose of granulation is to consider from the quality, complete use of broken material injection molding can be completely. Some products, however, have problems with injection molding of fully cracked materials and have to use granulation materials.
