FAQ

Summarize the main steps of plastic mold trial

Summarize the main steps of plastic mold trial
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In order to avoid unnecessary waste of time and trouble during mass production, it is indeed necessary to pay patience to adjust and control various processing conditions, find out the best temperature and pressure conditions, and formulate standard test procedures for the establishment of routine Working methods.

  • 1. Check whether the plastic in the barrel is correct and whether it is baked according to the regulations (if different raw materials are used for trial mold and production, different results are likely to be obtained).
  • 2. The cleaning of the material tube should be thorough to prevent the bad degumming material or miscellaneous material from being injected into the mold. Because of poor gel and miscellaneous materials, the mold may be stuck. Check whether the temperature of the material pipe and the temperature of the mold are suitable for the raw materials processed.
  • 3. Adjust the pressure and injection volume to produce products with satisfactory appearance. But do not run off the flash, especially when there are some mold cavity products that have not yet completely solidified. Before adjusting various control conditions, you should think about it, because a slight change in the mold filling rate may cause a large change in mold filling.
  • 4. Wait patiently until the conditions of the machine and the mold stabilize, that is, the medium-sized machine may also wait more than 30 minutes. You can use this time to view possible problems with the product.
  • 5. The time for the screw to advance should not be shorter than the time for the gate plastic to solidify, otherwise, the weight of the product will be reduced and the performance of the product will be damaged. And when the mold is heated, the screw advance time also needs to be lengthened in order to compact the product.
  • 6. Reasonably adjust to reduce the total processing cycle.
  • 7. Operate the newly adjusted conditions for at least 30 minutes until it is stable, and then continuously produce at least a dozen full-mold samples, mark the date and quantity on their holders, and place them separately according to the mold cavities to test their stability And derive reasonable control tolerances (especially valuable for multi-cavity molds).
  • 8. Measure the continuous sample and record its important dimensions (it should be measured when the sample is cooled to room temperature).
  • 9. Compare the measured size of each mold sample, you should pay attention to:
    (1) Whether the product size is stable;
    (2) Whether certain sizes have a tendency to increase or decrease, and show that the machining conditions of the machine are still changing, such as poor temperature control or oil pressure control;
    (3) Whether the dimensional change is within the tolerance range.
  • 10. If the product size no longer changes, and the processing conditions are normal, you need to observe whether the product quality of each cavity can be accepted, and its size can be within the allowable tolerance. Record the number of cavities that are measured continuously or larger or smaller than the average value in order to check whether the size of the mold is correct.

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