Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PP Burnt Mark at the End

A

Speed and venting are the adjustment directions for PP burnt; the end is the key area; monitoring prevents recurrence.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding PP;burnt mark;end;trapped air;speed;venting

Q

PP Multi-Stage Injection Application

A

PP multi-stage injection: slow entry, fast middle, slow finish; 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 future problems

Injection Molding multi-stage injection jetting venting staging

Q

PP MFI and Processing Matching

A

PP MFI is selected by wall thickness and strength; high MFI for thin walls, low MFI for structure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding MFI melt index thin wall strength

Q

PP Holding Pressure and High Shrinkage

A

PP's high shrinkage requires sufficient holding pressure, 50-80% with extended time; 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 future problems

Injection Molding holding pressure shrinkage sink mark internal stress

Q

PP Injection Pressure Range

A

PP injection 70-140MPa; good fluidity means guarding against over-pressure flash; 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 future problems

Injection Molding injection pressure short shot flash fluidity

Q

PP High-Flow Grade Processing

A

For PP high-flow material, prevent flash; thin-wall filling is its strength; 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 future problems

Injection Molding high flow MFI flash thin wall

Q

PP Injection Pressure 70-140

A

The medium-high range of PP injection pressure is the filling guarantee; the holding pressure ratio is standard; balance prevents stress.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding PP; injection pressure; 70-140MPa; thin wall; holding pressure; stress

Q

PPS Flash Overflow

A

PPS flash is a contest between low viscosity and mold condition; mold hardness maintenance is the long-term defense line; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Injection Molding PPS; flash; parting line; low viscosity; mold

Q

PPS injection pressure 50-100MPa

A

PPS pressure window 50-100MPa; staged holding pressure control is a common means of preventing flash and sink marks; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding PPS; injection pressure; 50-100MPa; holding pressure; flash

Q

PPS injection speed medium speed

A

PPS speed strategy is medium-speed keynote plus end deceleration; the balance of shear heat and weld lines relies on segmented curves; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding PPS; injection speed; medium speed; burnt; weld line

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