1. By particles, granular particles uniform, crushing particles uneven, material instability, gap size, melt density is not the same, some will increase the difficulty of adjustment;
2. From the point of view of material impurities, granulation material granulation, after filtering some impurities are difficult to enter the material interior, relatively clean, crushing material is not easy;
3. From the perspective of color, the color after granulation is more uniform, and the color difference or uneven dispersion often occurs with toner or masterbatch, which is difficult to clean the hopper or barrel, and it is easier to clean the granulation;
4. From the material quality, granulation will often add some plasticizer, diffusion agent, graft agent, so as to ensure the quality of the material;
5. In terms of material modification, under the condition of a small amount of grafting, the mixing and mixing of several materials by twin-screw can be more uniform and produce more stable.
