The surface of Car Parts Mould keeps the plastic surface liquid for a long time, which is enough to form pressure in the cavity. If the cavity is full and the cavity pressure can press the soft plastic against the metal before the frozen skin hardens, the temperature of the cavity surface will be high. On the other hand, if the plastic entering the cavity at low pressure is suspended, no matter how short the time is, the slight contact with the metal will cause stains, sometimes called gate stains.
For every kind of plastic and plastic parts, there is a limit of mould surface temperature. If this limit is exceeded, one or more adverse effects may occur (for example, components may overflow burrs). Higher mould temperature means less flow resistance. On many injection moulding machines, this naturally means faster flow through the gate and cavity, because the injection flow control valve used does not correct this change, and faster filling will cause higher effective pressure in the runner and cavity.
It may cause flash burrs. Since the hotter mould does not freeze the plastics entering the flash edge area before high pressure forming, the melt can flash burrs around the ejector rod and overflow into the gap of the dividing line. This shows that there is a need for good injection rate control, and some modern flow control programmers can really do this.
Generally, the increase of the temperature of the car parts mould will reduce the condensation layer of the plastic in the cavity, and make the molten material flow more easily in the cavity, thus obtaining greater parts weight and better surface quality. At the same time, the increase of die temperature will also increase the tensile strength of parts. Many moulds, especially engineering thermoplastics, run at relatively high temperature. If the mould is not insulated, the heat lost to the air and injection moulding machine can easily be as much as that lost from the shooting cylinder. Therefore, the mould should be insulated from the machine plate, and if possible, the surface of the mould should be insulated. If the hot runner mould is considered, try to reduce the heat exchange between the hot runner and the cooled injection moulded part. This method can reduce energy loss and preheating time.
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