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Why Have Burn Marks in Injection Molding?
Original: Orignal | Author: DGMF Mold Clamps | Publish Time: 2021-11-27 | 2552 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?


D. appropriately controlling the injection speed and the screw speed;


E. is a reasonable set of gate location and select the correct form of the gate, this point is very important, practice shows that the introduction of an expanded type point gate, latent gate (tunnel gate) is better. Preferably selected position of the gate into the cavity in a larger melt transition chamber after the first injection, the flow does not feed directly into the large cavity.

Burn marks in injection molding cause 2: Properly controlled molding conditions

This also results in scorch and a plastic surface of the important reasons paste spot, in particular the size of its great influence on the speed of injection, when the slow feed stream into the cavity, the melt flow state of a laminar flow; when the injection speed rising to a certain value, the flow state gradually become turbulent.


In general, the plastic surface layer is more bright, and smooth flow is formed, is formed of plastic parts under turbulent flow conditions not only the surface paste prone spots, but the internal plastic parts prone to porosity. Accordingly, the injection speed is not too high, the material should flow in a laminar flow state controlling filling.