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Reasons and solutions for the top white of Shanghai injection molding products

by:Vowin Rapid Prototyping     2023-02-19
The reasons and solutions for the white top of Shanghai injection molding products? Shanghai Mulan Injection Molding Factory said that when the plastic parts of injection molding products are released from the mold, if the ejector pin is used, the ejector pin will often be in the Deep or shallow marks are left on the plastic parts. If these marks are too deep, the so-called dingbai phenomenon will appear, and in serious cases, the so-called top explosion will occur when the plastic parts are pushed through.

The reason for the top white phenomenon of plastic parts is mainly that the mold sticking force of the product is relatively large, and the ejection part of the plastic part causes white marks at the ejection position of the ejector pin. The specific reasons and methods are as follows:

1. The temperature of the rear mold is too low or too high: adjust the appropriate mold temperature.

2. The ejection speed is too fast: slow down the ejection speed.

3. With demoulding and chamfering: overhaul the mold (polishing).

4. The ejection of the finished product is unbalanced (broken thimble plate spring): overhaul the mold (to balance the ejection).

5. Insufficient number of thimbles or improper position: increase the number of thimbles or change the position of thimbles.

6. When the mold is demolded, the mold produces a vacuum phenomenon: clean the stains in the thimble hole, and correct the air intake effect

7. Finished bone and column rough (undercut): polish each bone and column.

8. Excessive injection pressure or holding pressure: reduce the pressure appropriately.

9. The demoulding slope of the finished mold is too small: increase the demoulding slope of the rear mold.

10. The action time or position of the side slider is improper: overhaul the mold (to make the core pulling action normal).

11. The ejector pin area is too small or the ejection speed is too fast: increase the ejector pin area or slow down the ejection speed.

12. The injection speed of the last section is too fast (burr): slow down the injection speed of the last section.

The above are the reasons and solutions for the top white of Shanghai injection molding products introduced by Shanghai Mulan Injection Molding Processing Factory.
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