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Influence of mold temperature on injection molding
Jan 22, 2018


1. Mold temperature is the most desired variable in injection molding -- no matter what plastic is injected, it is necessary to ensure the basic wetting of the mold surface.A hot mold surface keeps the plastic surface liquid long enough to form pressure in the cavity.If the cavity is filled and before the frozen epiderm is hardened, the cavity pressure can press the soft plastic onto the metal, so the surface of the cavity is duplicated.On the other hand, if the plastic that enters the cavity at low pressure is suspended, no matter how short it is, the slight contact with the metal will cause a stain, sometimes referred to as the gate spot.

2. For each kind of plastic and plastic parts, there is a mold surface temperature limits, more than the limit of one or more adverse effects may appear (for example: components can overflow flash).Higher mold temperature means lower flow resistance.In a number of injection molding machine, this natural means faster through the runner and cavity, because the injection flow control valve is not correct the change, filling faster will cause higher in the runner and cavity pressure effectively.

3. It may cause overspill.Because the hotter model does not freeze the plastic that enters the edge of the overflow area before the high pressure is formed, the melt can spill over the edge of the spout and spill over into the gap.


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