NEWS
What are the causes of mould release difficulties in plastic injection moulding?
Release time:
Apr 12,2023
In the plastic injection moulding, plastic parts from the mould cavity, whether using a single or multiple components of the ejector mechanism, its demoulding work is generally a one-time completion. However, sometimes due to the special shape of the plastic part or the needs of production automation, after the completion of a demoulding work, the plastic part is still difficult to remove from the cavity or can not be automatically dislodged, at this time, it is necessary to add another demoulding action in order to make the plastic part to fall off. Difficulty in demoulding is mainly due to the tightness of the gate or the part inside the mould. Among the reasons:
1、Equipment: insufficient ejector force.
2、Mould
(1) Unreasonable structure or improper position of mould release.
(2) Insufficient slant of demoulding.
(3) Mould temperature is too high or poor ventilation.
(4) Roughness of sprue wall or cavity surface.
(5) The nozzle and the mould inlet coincide with the non-servicing or the nozzle diameter is larger than the diameter of the inlet.
3、Technical aspects
(1) The barrel temperature is too high or the injection volume is too much.
(2) The injection pressure is too high or the holding pressure and cooling time is long.
4, raw material aspects: insufficient lubricant.
The traditional plastic moulding parts of the demoulding method is roughly divided into four kinds of top, push, pumping, spinning. Now there is a newest demoulding technology can easily solve the plastic demoulding problem. In the plastic moulding industry, especially the need to use a variety of resin compounds for highly complex design, appearance of high gloss finishing, there are many unsolvable problems.
Nano-mould release coatings can be formed on the surface of plastic moulds and even on the insert surface of plastic moulds, which can significantly reduce the friction coefficient of these surfaces and achieve a high gloss finish without the use of traditional release agents. Even in critical cases where the design and plastic compounds used result in long machine/tool maintenance downtimes, resulting in low production output and economic impracticality, nano-mould release coatings can extend uninterrupted production times and significantly reduce machine/tool maintenance downtimes. Make plastic mould production play ** efficiency and role, reduce waste. Nano release coatings not only improve the smoothness and accuracy of plastic mould surfaces, but also significantly increase the productivity of the plastic mould manufacturing industry!
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