Problem & Solution

Practical answers to common plastic material challenges

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Q

PC Warpage Deformation

A

For PC warpage, mainly check 'holding pressure and uneven cooling' rather than crystallization: as an amorphous material, PC's warpage is more of a stress problem; restraining the holding pressure and making the temperature field uniform, warpage is mostly controllable.

Molds & Tooling PC; warpage; uneven cooling; holding pressure; stress

Q

PC Weak Weld Line Strength

A

PC weld lines rely on 'high-temperature meeting + good venting': PC molecular chains have large rigidity, and the meeting temperature is decisive; plan the gate in advance for structural parts to move the weld line out of the load path, rather than reinforcing afterwards.

Molds & Tooling PC; weld line; venting; melt temperature; strength

Q

PC Gate Blush (Gate Mark)

A

PC gate blush is solved by 'enter slowly, flow fast': lower the speed through the gate, enlarge the gate, and then stabilize the holding pressure switchover; the gate area of transparent parts is where shear is most concentrated and needs key care.

Molds & Tooling PC; gate blush; shear; injection speed; mold temperature

Q

PC Product Stress Cracking

A

The core of PC management is 'internal stress management': cracking is often a time bomb that explodes after leaving the factory; restraining the holding pressure and eliminating uneven cooling is far more effective than screening cracked parts afterwards.

Molds & Tooling PC; stress cracking; residual stress; annealing; solvent

Q

PC Product Yellowing

A

PC yellowing = 'thermal history exceeding the standard': lower temperature, shorten time, and reduce shear all together; the actual melt temperature is often higher than the set value, shear heat must be actually measured; PC has strong thermal sensitivity, and temperature management must leave s...

Molds & Tooling PC; yellowing; thermal degradation; residence time; shear heat

Q

PBT Flame-Retardant Grade Processing

A

Flame-retardant PBT is the grade family with the strictest temperature discipline; anti-corrosion and the recycling ban are supporting requirements; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; flame retardant; thermal stability; mold corrosion; sprue material

Q

PBT Poor Demolding

A

PBT poor demolding is investigated along three lines: pressure, temperature, and structure; the basic condition of the mold is fundamental; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; poor demolding; holding pressure; draft angle; polishing

Q

PBT Warpage Deformation Troubleshooting

A

PBT warpage troubleshooting first distinguishes pure material from glass fiber; uneven cooling and fiber orientation are two different rectification routes; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; warpage; uneven cooling; fiber orientation; wall thickness

Q

PBT Cold Material Jetting Marks

A

PBT jetting marks are investigated along two lines: nozzle temperature and gate; the cold slug well is the interception means on the structure side; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; jetting mark; cold material; nozzle temperature; gate

Q

PBT Gas Burning

A

PBT gas burning gives priority to venting; PBT's characteristic of heavy mold deposit makes vent cleaning a high-frequency maintenance item; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PBT; gas burning; venting; mold deposit; speed reduction

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