The adhesive material (15) and the plastic housing material (4) fill the spaces (13, 14) without the formation of cavities.

ProtoFlow, however, does not show areas of distortions or sink in your part.

This ensures that there is no sagging or deformation during the cooling process.

7 Sink: As plastic solidifies in a mold it freezes from the outside in.

8 Sink: As plastic solidifies in a mould it freezes from the outside in.

If the risk of sink is too high in some sections, then other strength-building methods should be considered.

When interior of a part solidifies before its surface, a small recess in an otherwise flat surface may appear, called a sink mark.

A second fluid pressure reducing valve (79) allows a relatively low holding pressure in the article sufficient to complete the article and hold any thick sections of the article from sinking.

From left to right, Figure 1 represents a part designed with thick features and the resulting sink once molded.

This is often used to combat sink or fill problems, but also increases the likelihood of flash and may cause the part to stick in to the mould.

From left to right, Figure 1 represents a part designed with thick features and the resulting sink once moulded.

When you have a surplus of material meeting at internal rib-to-wall intersections, sink marks can appear on the visible side of the part.

In thick sections this results in inward pulling stresses (due to contraction) that can cause depressions (sink marks) in the outer surfaces of the part.

Bosses should follow molding design guideline rules of properly designed walls of 40-60 percent of the surrounding area to avoid sink.

This is called warp, and is easily avoided by following the same rules used with sink, namely staying within the general wall thickness guidelines.