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Practical answers to common plastic material challenges

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Q

ABS brittle cracking——metal insert stress

A

Insert parts need preheating, and sufficient interface wall thickness must be reserved.

Molding Process ABS；insert；stress cracking；shrinkage difference；preheating

Q

ABS brittle cracking——too low mold temperature, weak weld line

A

Weld line strength is guaranteed by temperature; low temperature and fast cooling is an invisible killer.

Molds & Tooling ABS；brittle cracking；weld line；mold temperature；molecular entanglement

Q

ABS brittle cracking——too small gate shear overheating

A

A small gate saves material but may exchange for brittle parts: the shear heat and internal stress at the gate are hidden killers; if appearance allows, making the gate a little bigger often solves local brittleness better than adjusting a bunch of parameters.

Molds & Tooling ABS；brittle cracking；gate；shear heat；internal stress

Q

ABS product brittle cracking——ejection system imbalance

A

For ABS ejection cracking, check the ejection mechanism first rather than the material: balancing the ejection force, increasing the load-bearing area, and giving sufficient cooling are the three axes; the ejection cracking location is often the ejector pin location, and following the ejector pin...

Molds & Tooling ABS；ejection cracking；ejection；stress concentration；ejector pin；cooling

Q

ABS product brittle cracking——excessive regrind ratio

A

ABS regrind is not unusable, but the ratio and thermal history must be controlled; the improvement in fluidity is precisely a signal of molecular weight decrease; don't be fooled by 'easy to mold'——the performance account must be calculated with impact and tensile data.

Material Drying ABS；brittle cracking；regrind ratio；molecular weight；regenerated material

Q

ABS product brittle cracking——plasticizing capacity mismatch

A

Matching the ABS plasticizing capacity with the product is the first equipment gate against brittleness: too large or too small both cause brittleness; factoring in 'residence time' when selecting the machine is far more effective than adjusting the process on the wrong machine afterwards.

Injection Molding ABS；brittle cracking；plasticizing capacity；residence time；machine matching

Q

ABS product brittle cracking——barrel dead corner degradation

A

For chronic, widespread brittleness of ABS, prioritize suspecting equipment dead corner degradation rather than the process; purging and disassembling and cleaning dead corners is the fundamental cure; repeatedly adjusting the process on equipment with dead corners only wastes material and covers...

Molds & Tooling ABS；brittle cracking；degradation；barrel dead corner；purging

Q

ABS vacuum void (shrinkage cavity)

A

For ABS bubbles, first distinguish 'vacuum void' from 'gas-containing bubble': bubbles that exist the moment the mold opens are mostly gas-containing (moisture), those that appear later inside are mostly vacuum voids; vacuum voids rely on compensation, gas-containing bubbles rely on venting; only...

Material Drying ABS；vacuum void；shrinkage cavity；holding pressure；compensation；thick wall

Q

Internal bubbles in products caused by ABS water content

A

For bubbles, check water content first, then check temperature and venting; the order cannot be reversed.

Material Drying ABS；bubbles；moisture；drying；back pressure

Q

Silver streaks (material bloom) caused by insufficient ABS raw '2079851475616104451

A

More than 90% of ABS silver streaks are moisture problems; check drying first before adjusting the process; water content not only produces silver streaks, but also catalyzes degradation and makes the product brittle, so drying is both an appearance gate and a performance gate, and must be manage...

Material Drying ABS；silver streak；material bloom；drying；moisture content；catalytic cracking

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