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Why Have Burn Marks in Injection Molding?
Original: Orignal | Author: DGMF Mold Clamps | Publish Time: 2021-11-27 | 2554 Views | Share:
When it comes to molding defects, burn marks in injection molding are some of the most common. Why have burn marks in injection molding?

Burn marks in injection molding cause 3: Mold failure

If the mold release agent discharge hole is blocked and the precipitated material was cured, the mold is provided an exhaust position is not correct or not, and filling too fast, too late insulating air discharged from the high-temperature gas to compression mold the resin will decompose coker. In this regard, it should be clear the obstruction, reducing mold clamping force, the exhaust gas to improve the poor mold.


Determining the position and form of the mold gate is also very important, should be fully considered in the design of the melt flow properties of the exhaust gas and the state of the mold.

In addition, the amount of the releasing agent cannot be too high to maintain the cavity surface finish.

Burn marks in injection molding cause 4: raw materials do not meet the requirements

If the feed moisture and volatile matter content are too high, the melt index is too large, excess lubricant will cause burning and paste spot fault.

In this regard, should the use of hopper dryer or other drying methods pre-treating the feedstock, with a smaller change in melt index of the resin and reduce the amount of lubricant.