Plastic Coffee Tray Mould

Main steps of plastic coffee tray mould testing

1. Check whether plastic in the barrel is correct and whether it is baked according to regulations (if different materials are used for test and production, it is likely to have different results)

2. Clean up material pipe, in order to prevent inferior compound or miscellaneous materials from being injected into the mould, because inferior compound and miscellaneous materials may cause mold to be stuck. Check whether the temperature of tube and mould is suitable for processing raw materials

3. Adjust pressure and amount of injection to produce finished plastic injection molded parts with satisfactory appearance. However, it cannot have burrs, especially when some cavity products are not completely solidified. Before adjusting various control conditions, you should think more about it, because the filling rate is slightly changed, which may cause a large filling change

4. Be patient and wait until the conditions of the machine and mold are stable. The medium-sized machine may have to wait for more than 30 minutes. You can use this time to check possible problems that may occur in the finished product

5. Advancement time of the screw should not be shorter than the solidification time of gate plastic. Otherwise, the weight of plastic injection molded parts will be reduced, which will impair the performance of finished plastic molded products. And when mold is heated, screw advance time also needs to be lengthened to compact finished plastic molded products

6. Reasonable adjustment to reduce total processing cycle

7. Run newly transferred conditions for at least 30 minutes to stabilize, and then at least continuously produce a dozen full-mode samples, mark date and quantity on a holder, and place them separately according to the cavity to test the stability of operation, export reasonable control tolerances (especially valuable for multi-cavity molds)

8. Measure continuous sample and record its important size (should be re-sampled when the sample is cooled to room temperature)

9. Compare dimensions of each mold sample

10. If finished plastic molded products size does not change and processing conditions are normal, it is necessary to observe whether the quality of each finished product of cavity is acceptable, and size can be within tolerance. Write down the number of cavities that is continuous or large or less than the average value to check whether the size of the mold is correct

11. Make processing run time longer to stabilize melt temperature and hydraulic oil temperature

12. According to the size of all finished plastic injection molded parts is too large or too small to adjust machine conditions, if shrinkage rate is too large and the finished product appears to be insufficient, it can also be used to increase gate size

13. If the size of each cavity is too large or too small, if cavity and gate size are correct, then machine conditions should be changed, such as filling rate, mold temperature and pressure of each part, and whether the hole is filled slowly

14. According to the matching situation of finished cavity products or displacement of core, it may be individually modified. It may be possible to test filling rate and mold temperature again in order to improve uniformity

15. Inspect and modify the failure of the injection machine. All future data that will help to successfully establish the same processing conditions should be saved in order to obtain a product that meets quality standards