Since degraded rubber and miscellaneous materials may clog the mold, in order to prevent degraded rubber or miscellaneous materials from being injected into the mold, thoroughly clean the barrel, find the optimum temperature and pressure conditions, and establish a standard mold testing procedure.

Check whether the temperature of the barrel and mold is suitable for processing raw materials, adjust the pressure and injection volume, because the filling rate does not change much, it may cause the filling volume to change. When the mold is propelled by the screw during heating, the time should be extended appropriately to compact the finished product.

If the cavity size is still correct, try to change the machine conditions, if the cavity size is too large or too small, please correct it, such as mold filling rate, mold temperature and various pressures, and check if some cavities are filled slowly, check the injection molding machine Faults, such as defects in oil pumps, oil valves, thermostats, etc., will cause changes in processing conditions. Even a perfect mold will not work well on a poorly maintained machine.

Properly keep all sample inspection records during mold trial, and keep all data that will help to successfully establish the same processing conditions in the future, so that the product meets the quality standard. At present, the factory trial mold often ignores the mold temperature, but in the short-term mold trial and future mass production, it is the most difficult to master the mold temperature. Incorrect mold temperature can affect sample size, shrinkage, gloss, flow pattern and starvation.