The influence of melt index on plastic materials

- Apr 28, 2021-

1. The melting index will affect the performance of the plastic. For plastic raw materials, generally high melt index, high fluidity, convenient molding and processing, good stiffness and barrier properties; poor impact resistance, environmental stress cracking resistance, outdoor properties, and chemical resistance properties; the smaller the melt index , The fracture strength, hardness, toughness, aging stability and other properties are all improved.

2. Processing such as spinning and injection molding of polyester is carried out in the molten state. The viscosity of the melt is one of the most important parameters in its rheological properties, and it is also the key to ensuring product quality.

3. The melt index is a parameter that characterizes the flow rate of the raw material in the screw. The flow rate of the polymer is measured under the given shear force, which is related to the shear force and temperature.

4. The friction coefficient between the material with high melt index and the screw in the extruder is relatively small, so the output is relatively small. The material with high melting index generally has more impurities, which puts a lot of pressure on the machine head, which is easy to cause network blockage.

5. Whether the fluidity of the test material can meet the production requirements, if the test result is unqualified, it cannot be used as a production raw material.

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