Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PA6 Product Melt Fracture Marks

A

PA6 shear marks = 'gate buffering': bring down the speed through the gate and enlarge the gate; low-viscosity material high-speed filling must guard against surface layer instability; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurr...

Molds & Tooling PA6; shear marks; melt fracture; gate

Q

PA6 '2079851475616104452 Metering Fluctuation

A

Stable PA6 metering = 'check ring health': low-viscosity nylon has extremely high requirements for check ring sealing; cushion fluctuation is the most intuitive alarm; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA6; metering fluctuation; check ring; cushion

Q

PA6 Product Delamination

A

PA6 delamination = 'contamination': mixing in incompatible material is the first cause; nylon is incompatible with other polyolefins, material mixing is a big taboo, and find the pollution source first; after confirming effectiveness, solidify the parameters and practices into the work instructio...

Material Drying PA6; delamination; contamination; release agent; moisture content

Q

PA6 '2079851475616104452 Mold Sticking

A

PA6 mold sticking = 'gripping force': reduce pressure and temperature to reduce gripping, draft angle and polishing to reduce resistance; the demolding resistance of crystalline nylon must be managed with emphasis; after confirming effectiveness, solidify the parameters and practices into the wor...

Injection Molding PA6; mold sticking; holding pressure; draft angle; shrinkage

Q

PA6 '2079851475616104452 Ejection Whitening

A

PA6 ejection whitening = 'concentrated stress': disperse ejection force and give sufficient cooling; crystalline nylon has large gripping force, and the ejection system must leave sufficient margin; after confirming effectiveness, solidify the parameters and practices into the work instruction to...

Injection Molding PA6; ejection whitening; gripping force; cooling; ejection

Q

PA6 '2079851475616104452 Jetting Marks

A

PA6 jetting marks = 'hit the wall first after entering': gate direction cooperates with the speed curve; let the front spread against the wall, and the snake-shaped marks disappear; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA6; jetting marks; gate; injection speed

Q

PA6 Product Poor Surface Gloss

A

PA6 gloss = 'mold temperature + drying': mold temperature manages replication, drying manages surface state; moisture will drag down gloss, and drying is the prerequisite for gloss; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence.

Material Drying PA6; gloss; mold temperature; drying; polishing

Q

PA6 '2079851475616104452 Yellowing

A

PA6 yellowing = 'management of heat + oxygen': check at three places of material temperature, residence, and drying temperature; nylon is sensitive to thermal oxidation, and heat history must be strictly controlled; after confirming effectiveness, solidify the parameters and practices into the wo...

Material Drying PA6; yellowing; thermal oxidation; material temperature; drying temperature

Q

PA6 Product Insufficient Toughness (Dry-state Brittleness)

A

PA6 'dry-state nylon assembly = time bomb': condition first and then assemble; dry-state and wet-state toughness are worlds apart, and assembly timing and conditioning management must be included in the process.

Material Drying PA6; dry-state brittleness; clips; conditioning; assembly

Q

PA6 Product Post-crystallization Dimensional Drift

A

PA6 post-crystallization = 'the crystallinity given by mold temperature is insufficient': raising mold temperature to lock crystallization is fundamental; dimensions must be managed 'after aging', and parts molded at low mold temperature must especially guard against post-crystallization.

Molds & Tooling PA6; post-crystallization; dimensional drift; mold temperature; annealing

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