Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PA66 product flow marks

A

PA66 flow mark='front': stabilize speed and maintain temperature; the front's temperature and rhythm determine surface quality; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PA66; flow mark; mold temperature; speed curve

Q

PA66 injection molded product material shortage—venting type

A

PA66 fixed-point material shortage='venting': short shot method locates, open vents at fixed points; if the air trap is not removed, the higher the pressure the more defects; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; material shortage; venting; short shot method

Q

PA66 product heat-resistance deformation

A

PA66 heat resistance 'check by wet state': heat deflection temperature drops after water absorption; dry-state data cannot be directly used for wet-state design, sufficient margin must be left; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent r...

Processing Machinery PA66; heat deflection; wet state; grade

Q

PA66 '2079851475616104452 metering instability

A

PA66 metering='check ring health': high temperature and high pressure accelerate check ring wear; cushion fluctuation is the most intuitive alarm; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; metering; check ring; cushion

Q

PA66 product delamination

A

PA66 delamination='contamination': mixing in incompatible material is the primary cause; nylon and polyolefin are incompatible, mixing materials is a major taboo; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Extrusion & Post PA66; delamination; contamination; release agent

Q

PA66 mold sticking

A

PA66 mold sticking='gripping force': reduce pressure and temperature to reduce gripping, draft and polishing to reduce resistance; crystalline nylon demolding resistance must be managed as a priority; after confirming effectiveness, fix the parameters and practices into the work instruction to pr...

Molds & Tooling PA66; mold sticking; holding pressure; draft angle

Q

PA66 ejector whitening and cracking

A

PA66 ejector whitening='concentrated stress': distribute ejection force and give sufficient cooling; high-rigidity nylon ejection systems must leave sufficient margin; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PA66; ejector whitening; gripping force; ejection

Q

PA66 '2079851475616104452 jetting marks

A

PA66 jetting mark='hit the wall at entry': gate direction coordinates with the speed curve; letting the front spread against the wall can eliminate it; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PA66; jetting mark; gate; speed

Q

Poor surface gloss of PA66 products

A

PA66 gloss='mold temperature + speed': fast-crystallizing nylon needs high-temperature fast replication; mold temperature and speed are the two levers of gloss; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Molds & Tooling PA66; gloss; mold temperature; replication; polishing

Q

PA66 high melt viscosity and insufficient injection pressure

A

PA66 'use shear thinning characteristics to help filling': increasing speed is smarter than hard-pulling pressure; high-viscosity nylon should make good use of its rheological characteristics, and equipment pressure margin must also be sufficient.

Injection Molding PA66; viscosity; shear thinning; injection pressure; gate

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