Problem & Solution

Practical answers to common plastic material challenges

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Q

PC Injection Nozzle Blockage

A

For PC nozzle blockage, 'first check the heating system': nozzle temperature is the lifeline; PC becomes viscous as soon as it cools, and the state of the heater band and thermocouple must be regularly inspected; after confirming effectiveness, solidify the parameters and practices into the work ...

Injection Molding PC; nozzle blockage; heater band; temperature; cold material

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 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/ABS Flow Marks

A

PC/ABS flow marks = 'front cools too fast': raising temperature and speed is the main line; high-gloss housings have the highest requirements for front management, and the matching of speed and temperature needs repeated refinement.

Injection Molding PC/ABS; flow mark; mold temperature; injection speed; front

Q

PC Birefringence (Rainbow Pattern)

A

PC rainbow pattern = 'optical development of internal stress': reducing pressure, raising temperature, and annealing can alleviate it; optical parts must minimize orientation stress from flow design, this is more of a design problem than a process problem.

Injection Molding PC; birefringence; rainbow pattern; internal stress; orientation

Q

PC Flash

A

With PC's high-pressure process, the clamping margin must be left sufficient.

Injection Molding PC; flash; clamping force; holding pressure; parting line

Q

PC Jetting Marks

A

Let the melt stream 'stick to the wall first and then spread out', and the jetting marks disappear.

Injection Molding PC; jetting mark; snake pattern; gate; injection speed

Q

PC Short Shot Caused by High Viscosity

A

For PC short shot, first 'raise temperature and speed up', then 'large gate', and finally 'change grade': high viscosity is PC's nature; when the structure allows, shortening the flow length and enlarging the gate is more effective than forcibly raising pressure, and also better protects the mold.

Injection Molding PC; short shot; high viscosity; melt temperature; injection pressure

Q

PBT Keycap Application

A

The quality of PBT keycaps lies in shrinkage control; only with uniform wall thickness plus precise holding pressure can the wear resistance advantage be perfectly presented; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding PBT; keycap; wear resistance; shrinkage; holding pressure

Q

PBT Gate Design Specification

A

PBT gate design takes large size matched with high speed as the principle; the 0.8-1.0t empirical formula is the benchmark for mold design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding PBT; gate; 1.5mm; 0.8-1.0t; high speed

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