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How To Deal With Sink Marks On The Surface Of Injection Molded Products?
Original: Original | Author: DGMF Mold Clamps | Publish Time: 2020-09-15 | 4469 Views | Share:
How to deal with sink marks on the surface of injection molded products?


1. Noun explanation

Uneven product wall thickness causes uneven surface shrinkage and sinks marks.

 Figure 1 Schematic diagram of sink marks

Figure 1 Schematic diagram of sink marks

 

2. Failure analysis and troubleshooting methods

 

1. Improper control of molding conditions. Properly increase the injection pressure and injection speed, increase the compression density of the melt, extend the injection and pressure holding time, compensate for the shrinkage of the melt, and increase the injection buffer volume. But the holding pressure cannot be too high, otherwise, it will cause bumps.

 

If dents and sink marks occur near the gate, they can be solved by extending the holding time;


When the plastic part has a depression in the wall thickness, the cooling time of the plastic part in the mold should be appropriately extended;


If the dents and sink marks around the insert are caused by the partial shrinkage of the melt, this is mainly caused by the temperature of the insert being too low, try to increase the temperature of the insert;