Problem & Solution

Practical answers to common plastic material challenges

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Q

PVC Short Shot

A

PVC short shot relies on coordination of temperature, venting and runner; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future

Molds & Tooling PVCshort shotviscosityrunner

Q

PVC Black Streak Troubleshooting

A

Black streaks are a signal of retention carbonization—stop the machine and troubleshoot immediately; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar...

Molds & Tooling PVCblack streakcarbonizationretention

Q

PVC Corrosion Cycle

A

PVC corrosion is a self-reinforcing cycle—prevent corrosion plus prevent degradation; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in th...

Molds & Tooling PVCcorrosionmold surfacechrome plating

Q

PVC First-Piece Verification

A

PVC first-piece verification must include temperature and color; gradual degradation can only be found early by reference sample comparison; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC;first-piece verification;color reference;material change;temperature

Q

PVC Surface Roughness

A

For surface roughness, check plasticization first, then the mold surface; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future

Molds & Tooling PVCsurface roughnessplasticizationmold surface

Q

PVC Short Shot Troubleshooting

A

The solution space for PVC short shot lies in pressure and structure; limited temperature means determines that design must come first; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC;short shot;thin wall;2mm;high flow

Q

PVC Burnt: Check Temperature First

A

PVC troubleshooting has a clear priority; temperature first, shear second, venting third—checking in order is most efficient; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC;burnt;troubleshooting order;temperature;55-60%

Q

PVC Shrinkage Rate Difference

A

PVC shrinkage differs fivefold between rigid and soft; mold design must determine the category first, then set the allowance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC;shrinkage rate;0.2-0.6%;1.0-2.5%;rigid and soft

Q

PVC Vent Slot 0.01-0.02mm

A

PVC venting is precision work; the 0.01-0.02mm window is combined with dense layout and regular cleaning; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC;vent slot;0.01-0.02mm;burnt;flash

Q

PVC Yellowing Graded Early Warning

A

Color is the thermometer of PVC degradation; yellow means warn, brown means stop, black means scrap—graded response is written into the work instruction; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC;yellowing;color grading;conjugated polyene;early warning

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