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Taizhou Union Plastic Mould Co.,Ltd

ADD:No.26, MaoFeng Street, Beicheng Development Area, Huangyan Dist., Taizhou, Zhejiang, China

Post Code: 312080

Contact:Ms vicky






Do You Know The Insulation Method Of Injection Mold?
Mar 08, 2019

Mold temperature is the most important variable in injection molding -- no matter what plastic is injected, the basic wetness of the mold surface must be ensured. A hot mold surface keeps the plastic surface liquid long enough to create pressure in the mold cavity. If the cavity is filled and the soft plastic is pressed against the metal before the frozen epidermis hardens, the surface of the cavity is duplicated higher.

On the other hand, if the plastic entering the mold cavity at low pressure is suspended, no matter how short the time, the slight contact with the metal will cause stains, sometimes called gate stains.

For each type of plastic and plastic parts, there is a limit of mold surface temperature beyond which one or more adverse effects may occur (e.g., components may overflow rough edges). Higher mold temperature means less flow resistance

On many injection molding machines, this naturally means faster flow through the gate and cavity, as the injection flow control valves used do not correct this change and faster filling results in higher effective pressure in the gate and cavity.

May cause overflows of rough edges. Since the hotter model does not freeze the plastic that enters the overflow edge area before high pressure is formed, the melt can overflow the rough edges around the ejector rod and spill into the parting line gap. This indicates the need for good injection rate control, and some modern flow control programmers can do just that.

Generally, the rise in mold temperature will reduce the plastic in the cavity condensation layer, so that the molten material in the cavity more easily flow, so as to obtain greater parts weight and better surface quality. At the same time, the temperature of the mold will increase the tension strength of the parts.

Mold insulation method

Many molds, especially engineering thermoplastics, operate at relatively high temperatures, such as 80 degrees Celsius or 176 degrees Fahrenheit. If the mold is not insulated, the amount of heat lost to the air and the injection molding machine can easily be as much as the jet cylinder.

So the mold a skeleton plate heat insulation, if possible, the surface of the mold heat insulation. If a hot runner mold is considered, try to reduce the heat exchange between the hot runner portion and the cooled injection parts. This method can reduce energy loss and heating time.