Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

GF-PC Surface Floating Fiber

A

GF-PC floating fiber = 'insufficient encapsulation': raise temperature and slow down to let the resin wrap the fibers; the appearance surface needs process + texture + grade cooperation, and machine adjustment alone is hard to eradicate it.

Molds & Tooling PC; glass fiber; floating fiber; encapsulation; melt temperature

Q

GF-PC Warpage (Fiber Orientation)

A

For GF-PC warpage, 'first look at the fiber orientation map': gate design is the breakthrough point; orientation-type warpage has a fixed direction, pressing it hard with cooling is ineffective, it must be adjusted from the orientation source.

Molds & Tooling PC; glass fiber; warpage; orientation; Moldflow

Q

PC Injection Machine Screw Wear Acceleration

A

Glass fiber material must be equipped with a wear-resistant plasticizing system.

Injection Molding PC; glass fiber; screw wear; metering; bimetallic

Q

PC Anti-UV Grade Yellowing

A

Outdoor PC 'must be equipped with a UV protection solution': ordinary PC not being sun-resistant is the material's nature; consider anti-UV at the material selection stage, as afterwards remediation is costly and ineffective.

Molding Process PC; yellowing; ultraviolet; anti-UV; aging

Q

PC Product Flaking (Delamination)

A

PC delamination is checked from both ends of 'shear and contamination': gate shear is the process inducement, contamination is the material inducement; delamination is an interface problem, find the root cause first before talking about the process.

Extrusion & Post PC; delamination; shear; contamination; orientation

Q

PC Cracking Around Inserts

A

PC insert parts = triple insurance of 'preheating + wall thickness + low stress': PC is most sensitive to stress, and the insert interface is a disaster area; do not use inserts if possible, and if they must be used, do the three things well.

Molding Process PC; insert; cracking; preheating; stress

Q

PC Product Surface Flow Marks

A

Flow mark treatment = constant front temperature and speed.

Injection Molding PC; flow mark; front temperature; speed curve; mold temperature

Q

PC Thin-Wall Part Flow End Burning

A

PC thin-wall 'high-speed process must match venting capacity': the faster the speed, the more the venting must be in place; the venting design of thin-wall parts must be front-loaded, do not wait until burning occurs to fix it.

Molds & Tooling PC; thin wall; burning; venting; high-speed filling

Q

PC and ABS Material Change Cross-Contamination

A

PC/ABS material change 'cross-contamination' is prevented by SOP: gradient temperature cleaning + disassembling and cleaning dead corners are standard actions; frequent cross material changes are the enemy of quality, use a dedicated line if possible.

Extrusion & Post PC; material change; cross-contamination; purging; SOP

Q

PC Product Melt Fracture Marks

A

PC melt fracture marks = 'shear exceeding the limit': for extrusion lower temperature of the melt and raise die temperature, for '2079851475616104452 reduce speed and enlarge the gate; PC has high viscosity and high shear sensitivity, and speed management must leave margin.

Extrusion & Post PC; melt fracture; shear; die; gate

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