Problem & Solution

Practical answers to common plastic material challenges

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Q

PP Shrinkage 1.0-2.5

A

PP's high shrinkage is a characteristic of crystalline materials; directionality and post-shrinkage are challenges; mold compensation and verification are equally important.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PP; shrinkage; 1.0-2.5%; crystallization; directionality; post-shrinkage

Q

PP Mold Temperature 20-80

A

The wide range selection of PP mold temperature is process flexibility; balance surface and cycle; independent temperature control compensates deformation.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PP; mold temperature; 20-80°C; surface; cycle; independent temperature control

Q

PPS Poor Surface Gloss

A

For PPS matte problems, check mold temperature first; 130-150°C is the temperature threshold for glossy surfaces; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; gloss; matte; mold temperature; polishing

Q

PPS Warpage

A

PPS warpage treatment prioritizes structure; pin-point gates homogenize orientation plus balanced cooling, and over-holding is as bad as under-holding; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; warpage; fiber orientation; pin-point gate; holding pressure

Q

PPS Draft Angle

A

PPS demolding must accommodate its brittleness; the three elements of draft angle, balanced ejection, and polishing are all indispensable; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; draft angle; 0.25-1°; ejector whitening; polishing

Q

Cautious Use of Hot Runners for PPS

A

PPS hot runners are usable but conditional; the valve-gate prohibition for glass fiber grades and temperature control accuracy are two disciplines; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; hot runner; valve gate; wear resistance; temperature control

Q

PPS Mold Steel Selection

A

PPS mold material selection is a triple requirement of heat resistance, wear resistance, and corrosion resistance; HRC55-60 is the baseline for mass-production life; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; mold steel; SKD-11; HRC55-60; abrasion

Q

PPS Check Valve and Retention

A

The low viscosity of PPS amplifies the impact of check valve failure; behind metering stability lies valve health; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; check valve; metering; cold material spot; nozzle

Q

PPS Burning and Gas

A

The PPS venting system must be designed for high-contamination conditions; groove depth precision plus frequent cleaning, and vacuum venting is the ultimate solution; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; burnt; vent groove; 5-8/1000mm; vacuum venting

Q

PPS Insufficient Filling Troubleshooting

A

PPS short shot troubleshooting prioritizes temperature, with structure as the backstop; after the process reaches its limit, the gate and flow-length ratio are the fundamental solutions; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPS; insufficient filling; short shot; flow-length ratio; gate

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