Shawl, also known as flying edge, overflow, overflow, etc., mostly occurs in the parting position of the mold, such as: the parting surface of the mold, the sliding part of the slider, the crack of the insert, the pores of the top rod, etc. If the spill is not solved in time, it will further expand, resulting in partial collapse of the imprint mold, resulting in a permanent obstruction. Insert cracks and the cape of the pores of the ejector bar can also cause the product to get stuck on the mold, affecting the mold release.
The injection molding process of injection mold can be roughly divided into three steps, first, temperature mastery; Second, pressure mastery; Third, the cycle of molding.
Confirm the cooling water path, the depth of screwing the screw into the plate is 1.5-1.8 times the diameter of the screw. If the screwing is insufficient, it is easy to slip the teeth, and there is a danger of mold falling. Check whether the staff, materials, tools, documents, equipment auxiliary equipment, etc. required for production are in good condition.
The characteristics of plastic injection molding are determined by the characteristics of the raw material, and there are two main points: one is the filling activity of the plastic melt during injection, and the other is the shrinkage position of the plastic in the mold cavity when it is cooled and cured. These two points determine the difference of the injection mold and the difficulty of the injection mold design. When designing injection molds, it is necessary to inquire about the characteristics of the processed plastic raw materials, so that the designed injection mold is more reasonable, and the characteristics of plastics are usefully exercised in the design process. Therefore, the questions that need to be considered in the injection mold design process are as follows.
If the temperature is too high, the low molecular weight substances in the nucleating agent will be dissected and volatilized, which reduces the active ingredients in the nucleating agent, reduces the improvement effect of brightness, and the higher temperature will destroy some crystal nuclei of PP Huaxia, reduce the middle of heterogeneous nucleation, so that the modification effect is low; If the temperature is too low, the evacuation of the nucleating agent is not good, and the brightness effect is poor. Therefore, selecting a suitable molding temperature is particularly difficult to improve clarity.
the plastic processing industry is quite vigorous, with the continuous progress of material technology, the injection molding process is now more and more mature, many manufacturers have been able to master this technology to produce and process plastics. In the middle of the injection molding process, the demand is often applied to a few molds, and the quality of the mold simply affects the quality of plastic products to some extent, so for the operator, the application of the tube mold is the basic requirement. What events do you need to pay attention to in the middle of the application process of injection molds?
