Problem & Solution

Practical answers to common plastic material challenges

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Q

Haze and blooming on PPO surface

A

PPO haze is the surface mapping of multiple factors of moisture, temperature, and speed; item-by-item investigation starts from drying; cavity surface consistency is the basic guarantee.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent re...

Material Drying PPO; haze; surface; gloss; mold temperature; air entrapment

Q

Silver streaks and bubbles from insufficient PPO drying

A

PPO's low water absorption easily makes people relax drying management; the 0.05% moisture content red line must be quantitatively verified; drying is the lowest-cost defect prevention means.

Material Drying PPO; silver streaks; drying; bubbles; moisture content; 110℃

Q

Drying management of PP '2079851475616104452

A

Low moisture absorption material does not mean no drying is needed; moisture-proof management in the rainy season cannot be omitted.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a...

Material Drying PP; drying; moisture absorption; silver streaks; storage; humidity

Q

Silver streaks on PP injection molded parts

A

Investigate PP silver streaks along the three clues of moisture, degradation, and shear; verify by drying first, then check the temperature history.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PP; silver streaks; moisture; degradation; shear; drying

Q

Static electricity problem of BOPP film

A

Static management is a necessary condition for BOPP high-speed production; material antistatic and environmental control work together.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying PP; BOPP; static electricity; antistatic; ionized air; humidity

Q

PP '2079851475616104452 Silver Streak

A

When silver streaks appear on PP, don't rush to blame drying—first check regrind, masterbatch, and additive volatilization, then shear heat; PP silver streaks are more a 'volatiles and shear' problem than the raw material itself absorbing water.

Material Drying PP;silver streak;regrind;additive volatilization;shear heat;venting

Q

PP Regrind-Induced Embrittlement

A

PP regrind requires 'control ratio, control heat history, control drying' simultaneously, monitored with melt index and impact data; better flowability does not equal better usability—it is often exactly the signal of molecular weight drop and performance degradation.

Material Drying PP;regrind;embrittlement;degradation;molecular weight;melt index

Q

PP Part Internal Bubble

A

For PP bubbles, first distinguish 'vacuum bubble' from 'gas bubble': vacuum bubbles rely on feeding (holding pressure + gate position), gas bubbles rely on venting and volatiles control (drying + cooling + venting)—failure to distinguish leads in the opposite direction.

Material Drying PP;bubble;vacuum bubble;holding pressure;regrind;venting

Q

POM Dimensional Drift

A

Precision part dimensions are based on the post-aging state; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems

Material Drying POMdimensional driftagingpost-crystallization

Q

POM Silver Streak

A

For POM silver streaks, troubleshoot moisture first then shear; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems

Material Drying POMsilver streakmoistureshear

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