Why Granulate Before Injection Molding? What Are the Benefits of Granulation?

Post-granulation, the product quality will be higher for the following reasons:

1. The granules are uniformly sized, with particle granules being uneven, unstable material, varying gap sizes, and inconsistent melt density, which can increase the difficulty of adjustment.

From the perspective of material impurities, during granulation, some impurities are difficult to penetrate into the material interior after filtration, making the material relatively clean, while the granulation of crushed materials is more challenging.

3. After granulation, the color is more even, and it doesn't often have color discrepancies or uneven dispersion like color powder or color masterbatch, making it easier to clean the hopper or material drum; granulation is more easily washable.

4. During the granulation process, plasticizers, dispersants, grafting agents, and other additives are often added to ensure the quality of the material.

5. Considering material modification, several materials achieve greater uniformity and stability in production through twin-screw mixing and blending when grafted in small quantities.

The Difference Between Granulation and Injection Molding: These are two processes. Granulation involves melting some waste plastics and extruding them through a cutting machine to form granules. During the granulation process, additives can be added to improve the properties of the waste plastics, such as toughening agents. Injection molding is the process of melting plastic materials and then forming plastic products by hitting the mold with pressure. A popular saying is: Injection molding is made from plastic products, while granulation is made from "raw materials" to produce plastic products!