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    Conductive pp injection molding material

    Time: 2019-03-14 18:34 Author: admin Hits: Times

    Brittleness of the part means that the part is easy to crack or break in some parts. Brittleness is mainly due to the breakdown of the macromolecules due to material degradation, which reduces the molecular weight of the macromolecules, thereby reducing the overall physical properties of the polymer. How to solve the brittleness of conductive pp injection molding products?

    The reason for the brittleness is that the drying conditions are not suitable, the injection temperature is not set properly, the gate and runner system are not designed properly, the screw design is not suitable, the welding mark strength is not high, and excessive recycled materials are used.

    Set proper drying conditions before injection. If the plastic is dried for several days or the drying temperature is too high, although it can remove volatiles and other substances, it will also easily lead to material degradation, especially heat-sensitive plastics.

    Reduce the use of recycled materials and increase the proportion of raw materials. Use high-strength plastic.

    Conductive pp injection molding material

    Increasing the size of the main flow channel, the runner and the gate, and the too small size of the main flow channel, the runner, and the gate may easily cause excessive shear heat and cause the decomposition of the polymer.

    Select a well-designed screw to make the temperature distribution more uniform during plasticization. If the temperature of the material is not uniform, it is easy to accumulate excessive heat locally, resulting in degradation of the material.

    Reduce the temperature of the barrel and nozzle. Reduce back pressure, screw speed and injection speed, reduce the generation of excessive shear heat, and avoid polymer decomposition. If it is brittleness caused by insufficient welding mark strength, the welding mark strength can be improved by increasing the melt temperature and increasing the injection pressure. The brittleness of conductive pp injection molding materials can be solved by the above methods.


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