PP is a semi crystalline material that is harder and has a higher melting point than PE. Due to the brittleness of homopolymer type PP at temperatures above 0C, many commercial PP materials are random copolymers with 1-4% ethylene added or block copolymers with higher ethylene content. Copolymer type PP materials have lower thermal deformation temperature (100 ℃), low transparency, low glossiness, and low rigidity, but have stronger impact strength. The impact strength of PP increases with the increase of ethylene content.

Characteristics of PP granulator

1. Good flowability, but with a large shrinkage range and value, it is prone to shrinkage, dents, and deformation.

2. The plastic wall thickness must be uniform to avoid missing glue and sharp corners to prevent stress concentration.

3. Crystalline materials have low moisture absorption and are prone to melt rupture. They are prone to decomposition in long-term contact with hot metals.

4. The cooling speed is fast, and the pouring system and cooling system should slowly dissipate heat, and pay attention to controlling the molding temperature.

The PP granulator can be optimized and reasonably configured according to the requirements of the processing material system and process formula, including its aspect ratio, barrel structure, screw arrangement, mesh changing structure, exhaust quantity and position, feeding method, electrical control method, etc. To achieve multifunctional and versatile processing of polymer materials.