Top-3 Injection Moulding Defects and How to Fix Them?

Injection Moulding is one type of moulding used in manufacturing automotive parts. It is not much easy to manufacture automotive parts moulding, as it may involve some defects which are difficult to fix them. Thus, manufacturers like HQ Mould will take care to fix such defects to avoid risks. Some of the defects affecting the output of automotive parts such as

·         Flow Lines

·         Sink Marks

·         Vacuum Voids

Flow Lines:

Flow lines defects caused due to the flow of molten plastics into the mould in varying speed by making some bends in the output. This condition may also occur when the molten plastic flows through the mould of having varying wall thickness.

Remedies:

·         It is necessary to have injection speeds and pressure applied to the molten plastics maintaining at an optimal level. In addition to this, check the cavities filled properly or not.

·         Round corners and locations avoided to change the direction of flow of molten plastics.

Sink Marks:

If the cooling method is not done properly for the molten plastic, then it will result in sink marks. Most of the automotive parts moulding manufacturer maintains cooling time to avoid sink marks.

Remedies:

Lower the molding temperature, raise the holding pressure and finally increase the holding time so that the molten plastics will get adequate cooling time.

Vacuum Voids:

They are some air pockets that get trapped nearer to the surface of an injection moulded prototype, due to uneven solidification.

Remedies:

·         Here too similar to sink marks, increase the holding pressure and holding time as well.

·         Checking the alignment of mould parts properly to avoid vacuum voids.