How Does Table Mould Temperature Affect Injection Moulding?
Table Mould(FURNITUREMOULD) temperature is the most important variable in injection moulding - regardless of the type of plastic, it must be ensured that the surface of the table mould is substantially wet. A hot table mould surface keeps the plastic surface liquid for a long time, enough to create pressure in the cavity.
If the cavity fills up and the cavity pressure presses the soft plastic against the metal before the frozen skin hardens, the replication of the cavity surface is high. On the other hand, if the plastic entering the cavity at low pressure is suspended, no matter how short the time is, its slight contact with the metal will cause stains, sometimes referred to as gate stains.
Higher table mould temperatures mean less flow and less force. On many injection moulding machines, this naturally means higher effective pressures in the runners and cavities. May overflow the burrs. Since the hotter model does not freeze the plastic that enters the flash burr area before the high pressure is formed, the furnace charge flies around the ejector rod and overflows into the gap of the dividing line. This suggests that there is a need for good injection rate control, and some modern flow control programmers can do this.
Typically, an increase in the temperature of the table mould reduces the condensation layer of the plastic in the morning cavity, making the molten material flow more easily within the cavity, resulting in greater part weight and a more flawless surface quality. At the same time, the increase in the temperature of the table mould also increases the tensile strength of the part.
Many moulds, especially engineering thermoplastics, operate at relatively high temperatures, such as 80 degrees Celsius or 176 degrees Fahrenheit. If the table mould is not insulated, the heat lost to the air and the injection moulding machine can easily be lost as much as the shot cylinder.
Therefore, the table mould and the machine board are insulated, and if possible, the surface of the table mould is insulated. If a hot runner mould is considered, the test will reduce the heat exchange between the hot runner portion and the cooled injection moulded part. Such an approach can reduce the warm-up time of energy loss.