Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

PPO Thick-Wall Sink Marks

A

PPO sink mark treatment is constrained by the short holding pressure process orientation; structural design thickness reduction is the optimal solution; gate position determines feeding efficiency.; After confirming effectiveness, fix the parameters and practices into the work instruction to prev...

Molds & Tooling PPO; sink mark; thick wall; holding pressure; gate; stress

Q

Excessive PPO Holding Pressure and Cooling Time

A

The short holding pressure and short cooling process orientation of PPO is opposite to that of crystalline materials; understanding the freezing characteristics of amorphous materials is key; cycle optimization cannot come at the expense of quality.; After confirming effectiveness, fix the parame...

Molds & Tooling PPO; holding pressure; cooling time; cycle; amorphous; stress

Q

Improper PPO Runner Design

A

PPO runner design has clear industry norms; short and thick runners reduce pressure loss; hot runners have significant value for long-flow parts.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPO; runner; sprue; nozzle; hot runner; cold slug

Q

PPO Shrinkage Rate Estimation Deviation

A

The low shrinkage of PPO brings dimensional stability advantages; but precise values still depend on grade data; glass fiber directionality design cannot be ignored.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PPO; shrinkage rate; dimensions; grade; glass fiber; mold correction

Q

Improper PPO mold temperature management

A

High mold temperature of PPO is the core means of reducing internal stress; the 100~150℃ range requires oil temperature controller support; mold temperature uniformity is more important than absolute temperature.

Molds & Tooling PPO; mold temperature; internal stress; oil temperature controller; surface quality; 100℃

Q

PPO mold sticking and difficult ejection

A

PPO mold sticking treatment returns to the three basic elements of demolding: draft angle, polishing, and ejection; release agent is an auxiliary means rather than a radical cure; the holding pressure optimization space is often overlooked.

Molds & Tooling PPO; mold sticking; ejection; draft angle; polishing; ejector pin

Q

PPO burnt marks

A

For PPO burning, first distinguish the two causes of venting trapped gas and equipment stagnant material; fixed positions are characteristic of venting problems; random distribution points to equipment dead spots.; after confirming effectiveness, solidify the parameters and practices into the wor...

Molds & Tooling PPO; burning; venting; stagnant material; dead spots; trapped gas

Q

PPO warpage deformation

A

PPO warpage treatment takes cooling uniformity as the core; wall thickness consistency is the first principle in the design stage; the low shrinkage of amorphous materials does not mean freedom from deformation.; after confirming effectiveness, solidify the parameters and practices into the work ...

Molds & Tooling PPO; warpage; uneven cooling; wall thickness; mold temperature; deformation

Q

Imbalance of PP multi-cavity

A

Multi-cavity consistency relies on the dual balance of runners and cooling; managing data by cavity position is the foundation of refinement.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PP; multi-cavity; imbalance; runner; cooling; weighing

Q

Trapped gas burning of PP products

A

The location of trapped gas burning is the point to add venting; venting design for thin-wall high-speed parts should be considered in advance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PP; trapped gas; burning; venting; end; injection speed

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