Pillar Plastic Mould

1 Classification

It may be classified by if there is a half line on the B pillar lower part, while for the product with half line, there could be insert or slide in the mould.

As customers may use different raw material, shrinkage varies; some may do blast test, some may not; some may have an airbag in it, it is not good to determine the shrinkage by experience, while an answer from awarded raw material supplier is better.

2 Defects

Normally the product designers are not able to give a perfect work as they may not expert on mold construction and injection molding process, we gone solve it ourselves.

Point 1

To make the circled surface at cavity side so there will be a boundary line for texture.

Point 2

A Use no cross ribs which lead sink marks, T ribs would be better.

B Notice the hole positions for both left and right part, which may be different.

C Make the surface straight stand, one half for core side and the other for lifter, more stable.

D Make bigger draft angle for surfaces without assembly need, more than 1 degree.

Point 3

Differences for PL made by slide and insert

Using slide costs a little higher but gets longer life span and more operation choices, less risk to have eject marks and damages for lifer.

Point 4 For pillar plastic mould gating system

A One point direct gate even for mass production, but too big gate.

B One point submarine gate to make too obvious PL, three points would be better.

C One point direct gate and one submarine gate, leading weld lines and streaks at sub gate.

D\E Three point edge gates and back side injection, and for 2.5mm wall thickness, the flow length should be not more than 400mm.

Point 5 Reverse Ejection

Circled areas are not easy to release product from pillar plastic mould and deformation is also a problem, thus we need a reverse ejection structure that to have a fixed block next to the lifer in mould, so that the plastic part will not stick to the moving components.

Core here to function as a limit to prevent the part from moving following the slider.

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