Problem & Solution

Practical answers to common plastic material challenges

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Q

PP Burnt Trapped Air

A

For PP burnt, first clear venting, reduce final speed and control melt temperature; 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 ...

Molds & Tooling burnttrapped airventingfinal speed

Q

PP Bubble and Shrinkage Void

A

PP bubbles and shrinkage voids are divided into two types, holding pressure, drying and venting treat the symptoms; 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 refere...

Material Drying bubbleshrinkage voidholding pressuredrying

Q

PP Flash Overflow

A

PP flash is due to good fluidity, reduce pressure and check clamping and parting line; 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 t...

Injection Molding flashfluidityclampingparting line

Q

PP Silver Streak Moisture

A

PP silver streaks are mostly due to moisture, check drying, venting and storage; 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

Material Drying silver streakmoisturedryingventing

Q

PP Weld Line Low Thermal Conductivity

A

PP weld lines are due to low thermal conductivity, increase temperature, increase speed and overflow areas; 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 ...

Molds & Tooling weld linelow thermal conductivityconfluenceoverflow

Q

PP Sink Mark High Shrinkage

A

PP sink mark is the nature of high shrinkage, three moves of holding pressure, material reduction and strong cooling; 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 refe...

Molds & Tooling sink markhigh shrinkageholding pressurematerial reduction

Q

PP Warpage from Uneven Crystallization

A

The root of PP warpage is uneven crystallization, dual uniformity of mold temperature and wall thickness; 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 si...

Molds & Tooling warpagecrystallizationmold temperaturewall thickness

Q

PP Black Speck Thermal Decomposition

A

Temperature and residence are the main causes of PP black specks; equipment and purging are equally important; monitoring prevents degradation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PP;black speck;thermal decomposition;300°C;residence;purging

Q

PP Short Shot Underfilling

A

PP short shot is due to rapid solidification, increase temperature, increase speed, vent and enlarge gates; 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 ...

Molds & Tooling short shotrapid solidificationventinggate

Q

PP Uneven Gloss

A

Mold temperature stability is the core of PP uneven gloss; high mold temperature is the improvement direction; inspection ensures consistency.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PP;uneven gloss;mold temperature;fluctuation;high mold temperature;inspection

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