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.

DON’T use high backend pressures

You should try and avoid using high back pressures this will help to reduce brittleness, scars, wrinkles, sink marks and excessive flash. One exception is when you’re using regrind material or colour concentrates.

DON’T use large mould vents

Excessive gas is not produced during the process therefore it is not necessary for you to use large mould vents. Small conventional vents of 0.03 – 0.13 mm are usually sufficient.

DON’T discard scrap material

The best part of injection moulding is that if you have done everything correctly from the start you do not have to discard scrap material. If the material was initially dried and processed properly and is free of contamination it can be blended with virgin material up to a level of 25%.

DON’T rely on visual inspections

When it comes to judging the physical properties of a moulded part do not rely on visual inspections. Rather test the moulded part under exacting conditions. This is necessary to ensure that the part can stand up to its intended use without any failures or issues.

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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