The injection moulding process is relatively simple to understand but for newbies to the industry things can seem quite complicated at first. To help ease some of this we’ve sought out some popular dos and don’ts for the injection moulding process which we will share in this two-part post.

In part one of our post we’ll look at four things you should definitely do during the injection moulding process and in part two we’ll look at four things to avoid.

DO keep material contamination free

Keeping the material free of contamination is important if you want to produce tough clear parts. One way to do this is by purging your injection moulding machine thoroughly on a regular basis, especially when moving from a dark colour to a light colour.

DO keep injection speed slow

In order to reduce streaking and spray gate you should use a slow injection speed. Most modern machines allow you to programme your injection speed and if this is the case with your machine you should use slow or moderate speed or profile to produce the best possible appearance and a reasonable fill time.

DO keep melt temperatures low

You should always try and use the lowest possible melt temperature to help you achieve a satisfactory appearance and fill. Depending on the dwell time of the material in the cylinder the suggested operating range is 250°C – 270°C.

DO maintain mould temperature within accepted range

For best cycle times you should try and maintain your mould temperature at around 15°C – 40°C. It is worth noting that the mould temperature may be increased to enhance fill but mould temperatures above 55°C should be avoided if you want to reduce the risk of part sticking.

Lookout for part 2 of our post where we look at four things you don’t want to do during the injection moulding process.

Plastic & Chemical Trading are renowned for their extensive knowledge in injection moulding. Their years of experience and international partnerships ensure that you get world class solutions you won’t find anywhere else in Southern Africa.

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