Problem & Solution

Practical answers to common plastic material challenges

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Q

PC Mold Release Agent Induced Streaks

A

Mold release agent does more harm than good to PC; do not use it if possible, and if it must be used, select a compatible type and strictly control the dosage; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PC;mold release agent;streaks;haze;transparent parts

Q

PC Draft Angle and Ejection

A

Mechanical stress in the demolding stage is often overlooked; sufficient draft angle and balanced ejection can eliminate a large category of hidden cracking causes; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PC;draft angle;ejection whitening;ejection;scratching

Q

Structural Factors of PC Stress Cracking

A

Structural design determines the upper limit of the stress distribution of PC parts; fillets, uniform wall thickness and gentle transitions are the three anti-crack design principles, which must be implemented before mold making; after confirming effectiveness, solidify the parameters and practic...

Molding Process PC;stress concentration;fillet;wall thickness;notch sensitivity

Q

Material Factors of PC Stress Cracking

A

Crack resistance is first a material property; MFR selection and regrind control are the source, and the process can only be optimized on this basis; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PC;molecular weight;MFR;crack resistance;regrind ratio

Q

PC Internal Stress Polariscope Detection

A

Polariscope detection is a quantitative tool for PC stress management; only by turning invisible internal stress into a measurable indicator can preventive control be achieved; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Production & Quality PC;internal stress;polariscope;birefringence;stress detection

Q

Low PC Weld Line Strength

A

PC weld line strength is weak; the three moves are raising temperature, raising speed and relocating; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting s...

Molds & Tooling weld lineconfluencestrengthoverflow well

Q

PC Trapped Air Burning

A

For PC burning, first clear the venting; high-temperature materials fear trapped air more; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar prob...

Molds & Tooling burnttrapped airventingfinal speed

Q

Distinguishing PC Bubbles and Vacuum Voids

A

Bubble defects must first be classified and characterized; water vapor, vacuum voids and degradation gas correspond to three completely different rectification routes of drying, holding pressure and temperature control; after confirming effectiveness, solidify the parameters and practices into th...

Material Drying PC;bubbles;vacuum voids;holding pressure;degradation

Q

Non-Moisture Causes of PC Silver Streaks

A

Silver streaks are the most common PC defect but have multiple causes; exclude them item by item in the order of moisture, temperature, shear and contamination to avoid repeated ineffective drying; after confirming effectiveness, solidify the parameters and practices into the work instruction to ...

Material Drying PC;silver streaks;shear;contamination;troubleshooting order

Q

PC High-Gloss Paint-Free

A

PC high-gloss paint-free saves processes; mold mirror surface is the key; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Extrusion & Post high glosspaint-freemirror surfacemold

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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