Problem & Solution

Practical answers to common plastic material challenges

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Q

Poor ABS demolding (mold sticking)

A

For mold sticking, first reduce pressure and temperature, then check the draft angle and polishing.

Molds & Tooling ABS；mold sticking；draft angle；gripping force；polishing

Q

ABS black specks (carbonized specks)

A

ABS black specks mostly come from dead corner carbon deposits or material source contamination: purging is more effective than adjusting parameters; intermittent appearance is a typical feature of dead corner accumulated material, don't treat an equipment problem as a process problem.

Molds & Tooling ABS；black specks；carbonization；dead corner；purging

Q

ABS weld line (bonding line)

A

For ABS weld lines, 'if it cannot be eliminated, transfer it + raise temperature + vent': treating it as a structural design problem and avoiding it to a non-load-bearing area in advance is more effective than hard adjusting on the machine afterwards.

Molds & Tooling ABS；weld line；bonding line；venting；gate position

Q

ABS brittle cracking——sharp corner and notch stress concentration

A

A sharp corner in the structure is the starting point of a crack.

Molds & Tooling ABS；stress concentration；sharp corner；rounded corner；structural design

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——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

ABAK weld line strength

A

ABAK weld lines are the weak link of the alloy; temperature, speed, and gate are all important; dispersion quality affects the interface.; After confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence

Molds & Tooling ABAK；weld line；strength；gate；dispersion；venting

Q

ABAK warpage deformation

A

ABAK warpage improvement is an advantage over pure PA; however, process management is still necessary; uniformity is the core.; After confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence

Molds & Tooling ABAK；warpage；crystallization；mold temperature；holding pressure；wall thickness

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