Why granulation before injection molding? What are the benefits of granulation?

The product quality will be higher after granulation for the following reasons:

1. The particles and granular particles are uniform, the crushed particles are not uniform, the material is unstable, the gap size and melt density are different, and some will increase the difficulty of adjustment;

2. From the perspective of material impurities, when the granulated material is granulated, it is difficult for some impurities to enter the interior of the material after filtration, which is relatively clean and difficult to pulverize the material;

3. From the perspective of color, the color after granulation is relatively uniform, and there is often a color difference or uneven dispersion with toner or color masterbatch, it is difficult to clean the hopper or barrel, and the granulation is easier to clean;

4. In terms of material quality, some plasticizers, diffusing agents, grafting agents, etc. are often added during granulation, so as to ensure the quality of materials;

5. Considering the modification of materials, in the case of a small amount of grafting of several materials, the twin-screw stirring and mixing are more uniform, and the production is more stable.

The difference between granulation and injection molding: these are two processes, granulation is that some waste plastics are extruded by melt and cut into granules using a cutting machine. During the granulation process, some additives can be added to improve the properties of waste plastics. such as tougheners. Injection molding is the formation of plastic products by melting plastic material and then hitting a mold with pressure. The popular saying is: injection molding is made of plastic products, and granulation is plastic products made of "raw material"!