Problem & Solution

Practical answers to common plastic material challenges

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Q

PC Jetting Marks (Snake Pattern)

A

PC jetting marks 'let the melt stream stick to the wall first and then spread out': gate design coordinated with the speed curve lets the front stick to the wall as soon as it enters the cavity; jetting marks on transparent parts have nowhere to hide, and gate direction design must avoid it from ...

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

Q

PC Injection Melt Temperature Actually Measured Too High

A

PC 'set temperature ≠ melt temperature': shear heat must be actually measured; PC is sensitive to overheating, the actual melt temperature must be included in monitoring, not just looking at the displayed setting; after confirming effectiveness, solidify the parameters and practices into the work...

Injection Molding PC; melt temperature; shear heat; back pressure; screw speed

Q

PC Product Surface Orange Peel

A

PC orange peel = 'poor replication': supplement both pressure and temperature; end replication of high-gloss parts is the difficulty, mold temperature and holding pressure must be given sufficiently; after confirming effectiveness, solidify the parameters and practices into the work instruction t...

Molds & Tooling PC; orange peel; surface replication; holding pressure; mold temperature

Q

PC Frequent Black Specks at Injection Startup

A

PC startup black specks = 'shutdown management problem': lowering temperature and purging at shutdown is an iron rule; the number of startup scrap shots is a direct measure of whether the shutdown SOP is in place; after confirming effectiveness, solidify the parameters and practices into the work...

Injection Molding PC; startup; black speck; shutdown; carbonization

Q

PC Product Drop Fracture

A

For PC drop failure, 'first draw the fracture path map': check where it breaks; weld lines, sharp corners, and internal stress are the three high-incidence areas, and path analysis locates the fastest; after confirming effectiveness, solidify the parameters and practices into the work instruction...

Processing Machinery PC; drop; fracture; weld line; stress concentration

Q

PC Thin-Wall Transparent Part Flow Marks

A

PC thin-wall transparent parts 'have the highest requirements for flow stability': fine matching of speed and shear is the key; transparent parts amplify even tiny flow fluctuations; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurre...

Molds & Tooling PC; thin wall; flow mark; shear; hot runner

Q

PC Product Abnormal Odor

A

PC odor = 'degradation or contamination': first lower the temperature, then check the material source; odor is a signal of thermal history and cleanliness, and must be controlled from both the process and raw material ends; after confirming effectiveness, solidify the parameters and practices int...

Material Drying PC; odor; degradation; volatiles; contamination

Q

PC Product Abnormal Dimensional Shrinkage After Demolding

A

For PC dimensional deviation, 'first unify the measurement benchmark': non-unified measurement conditions are the illusion of many 'drifts'; PC's low shrinkage does not mean you can do whatever you want, the benchmark must come first.

Molds & Tooling PC; shrinkage; dimension; holding pressure; measurement

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 Silver Streaks Reappearing After Post-Processing

A

Reduce internal stress first, then machine.

Extrusion & Post PC; machining; crack; annealing; internal stress

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All Topics 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382