There Are Inevitably Some Shortcomings In The Crate Mould
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    • Last updated August 4, 2020
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There Are Inevitably Some Shortcomings In The Crate Mould

Posted By xiu umin     August 4, 2020    

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Under normal circumstances, plastic products produced by injection moulding have good luster and color on the surface, but there are some disadvantages inevitably in some cases. Besides the material problem of plastic itself, the colorant and glossiness on the surface of Crate Mould, what other reasons will cause this kind of influence in injection moulding?

(1) The mould finish of crate is poor, the surface of cavity is rusted, etc., and the mould exhausts badly.

(2) There is something wrong with the casting system of crate mould. Cold bullet holes should be enlarged, and runners, main runners, runners and gates should be polished.

(3) The material temperature and mould temperature are low, and the gate can be heated locally if necessary.

(4) Injection moulding process pressure is too low, speed is too slow, injection moulding time is insufficient, back pressure is insufficient, compactness is poor, and surface is blackened.

(5) Plastic should be fully plasticized, but material degradation should be prevented, heating should be stable, and it should be fully cooled, especially for thick-walled materials.

(6) Prevent cold materials from entering parts, and use self-locking springs or reduce nozzle temperature when necessary.

(7) Too many recycled materials are used, the quality of plastic or colorant is poor, water vapor or other impurities are mixed, and the quality of lubricant used is poor.

(8) The clamping force must be sufficient.

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