Most of the junior and intermediate injection molding technicians only use the first-level injection method for injection molding production. Many problems such as overflow and shrinkage in production can be solved with only one-stage injection adjustment. As a result, it gradually became a habit that has not changed for many years.
When there are some serious shrinkage or filling difficulties, in order to allow the melt to fill the cavity or solve the problem of shrinkage, higher pressure and faster injection speed must be used. Problems such as overflow. Therefore, the quality requirements of the mold are relatively high, and the mold part, the overflow edge, and the white top need to be repaired every time.
Learn and develop the good habit of multi-level injection. Many problems such as top white and overflow can be solved by adjusting the machine, thus reducing the cost and time of many mold repairs.
To be simple, when the original injection parameters are unchanged, when the injection reaches about 90% of the filling volume, immediately switch to the second level with a slightly lower pressure and speed to continue to fill the cavity and hold the pressure. Or, after shooting the cavity, start the third stage and maintain pressure with a lower pressure and speed. I believe the overflow problem will be solved well. Using the “positioning injection” method is also a good way to solve the problem of overflow and top white.
If there is also a shrinkage problem, properly extend the holding time or increase the holding pressure of the third stage of the holding pressure, and at the same time reduce the speed of the third stage. Shrinkage problems that are not particularly serious should be solved simultaneously.
If the problems of overflow and top white are indeed too serious and cannot be solved through the adjustment of the machine, it is not too late to send it for repair.
Therefore, learning multi-level injection tuning technology will have many benefits and can help people solve many technical problems. Junior and intermediate personnel must be proficient, otherwise the tuning technology will not be able to progress to a higher level.
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