How to overcome the cracks in the plastic parts when injection moulding is formed?
Such as injection mould injection molding plastic parts have crack, this is mainly due to the uneven parting when output, the mold balance or mold temperature is too low, cooling time is too long or too fast, small and plastic mold draft with the impurities and release agent due to reasons such as caused by improper use.The adjustment method is:
1) adjust the mold top out of the mechanism, so that the molded parts can be uniform and reliable when the mold is out.In addition, adjust the shape of the mold cavity, and make it more oblique, so as not to be forced to crack when the mold is out of mold.
2) reasonably control the molding process, such as improving the mold temperature and uniform temperature uniformity;Meanwhile, the cooling time and infusion speed should be controlled reasonably.
3) when the plastic parts with embedded parts are injected, the embedded parts should be preheated before use, and the surface impurities and oil stains should be removed.At the same time, use the release agent properly.
4) the inlet size is too large or the shape is unreasonable, easy to produce tensile stress and make the plastic parts crack.The inlet size and shape should be improved.
5) the plastic should be clean and strictly guarded against impurities.If the filler is used, it should be mixed evenly.