Problem & Solution

Practical answers to common plastic material challenges

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Q

ABS brittle cracking——improper mold temperature and cooling

A

ABS mold temperature should be set 'differentiated' according to wall thickness: raise the temperature for thick walls to ensure welding, lower the temperature for thin walls to prevent deformation; mold temperature is neither the higher the better nor the lower the better, uniformity and matchin...

Molds & Tooling ABS；brittle cracking；mold temperature；weld line；cooling

Q

ABS brittle cracking——poor runner design

A

If ABS brittleness is strongly related to 'certain cavities/certain areas', go back and check the runner system: runner imbalance is a congenital mold problem, machine parameters can only alleviate it, and the cure requires changing the runner design.

Molds & Tooling ABS；brittle cracking；runner；uneven filling；internal stress

Q

ABS product warpage——glass fiber orientation type

A

Orientation-type warpage relies on gate design, not on hard pressing by cooling.

Molds & Tooling ABS；glass fiber；orientation；anisotropy；warpage

Q

Post-shrinkage dimensional change of ABS parts

A

For ABS dimensions, first 'unify the measurement time point' before talking about compensation: standardize the measurement aging, and many 'drifts' disappear; residual stress relaxation is gradual, and aging management is the key.

Molds & Tooling ABS；post-shrinkage；dimensions；aging；stress relaxation

Q

Inconsistency between cavities of ABS multi-cavity mold

A

For ABS multi-cavity, first test the 'filling balance' before talking about the process window: when the runners are unbalanced, adjusting the process is just robbing Peter to pay Paul; cavity-to-cavity consistency is guaranteed by the hardware balance of runners and cooling.

Molds & Tooling ABS；multi-cavity；runner balance；uneven filling；cooling

Q

ABS cold slug mark

A

The antidote for cold slug marks is the cold slug well + nozzle temperature.

Molds & Tooling ABS；cold slug mark；cold slug well；nozzle temperature；gate

Q

ABS nozzle drool

A

For drooling, first lower the nozzle temperature and add suck-back; if ineffective, replace the nozzle.

Molds & Tooling ABS；drool；nozzle；suck-back；cold slug mark

Q

Persistent black specks after ABS material change

A

ABS material change black specks rely on 'SOP prevention' rather than post-adjustment: gradient temperature purging + disassembling and cleaning dead corners are standard actions; cross-switching with PVC is extremely risky, avoid it if possible.

Molds & Tooling ABS；material change；black specks；purging；SOP

Q

ABS dimensional instability

A

For ABS dimensional drift, first check 'plasticizing and metering stability': the cushion and check ring are the primary suspects; dimensions are the result of process stability, fix the process variables and the dimensions will naturally be stable.

Molds & Tooling ABS；dimensional instability；shrinkage rate；check ring；cushion

Q

ABS ejection whitening (stress whitening)

A

ABS ejection whitening=an alarm of 'ejection force exceeding the standard': disperse the ejection force, give sufficient cooling, and reduce the gripping force to eliminate it; the ejection whitening position is the ejector pin position, and following it to find the cause is the fastest.

Molds & Tooling ABS；ejection whitening；stress whitening；ejection force；cooling

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