Problem & Solution

Practical answers to common plastic material challenges

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Q

PC Mold Sticking and Scratching

A

For PC mold sticking, first reduce the holding pressure, then the draft angle and polishing; 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 pr...

Molds & Tooling mold stickingholding pressuredraft angleejection

Q

PC Black Specks Thermal Decomposition

A

For PC black specks, check dead corners and regrind; degradation above 320°C is the root; 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 probl...

Molds & Tooling black speckscarbonizationdead cornersdegradation

Q

PC Internal Stress Cracking

A

PC internal stress is the culprit of cracking; high mold temperature, annealing and polariscope detection; 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 troubleshoot...

Molds & Tooling internal stresscrackingmold temperatureannealing

Q

PC Warpage and Deformation

A

For PC warpage, check mold temperature uniformity, with annealing to relieve stress as an aid; 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 ...

Molds & Tooling warpagemold temperatureinternal stressannealing

Q

PC Sink Marks and Holding Pressure

A

For PC sink marks, first check the wall thickness and rib thickness, followed by holding pressure feeding; 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 troubleshoot...

Molds & Tooling sink markholding pressurewall thicknessrib area

Q

PC Short Shot Insufficient Filling

A

PC short shot is due to high viscosity; raise temperature, raise speed, vent and enlarge the gate; 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 simi...

Molds & Tooling short shothigh viscosityventinggate

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

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

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

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