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Q

Floating fibers of glass fiber reinforced PPO

A

For floating fiber treatment of PPO high-fiber reinforcement, speed is the key variable; both too fast and too slow cause problems; venting and temperature must cooperate to obtain a uniform surface.; after confirming effectiveness, solidify the parameters and practices into the work instruction ...

Extrusion & Post PPO; floating fiber; glass fiber; injection speed; venting; appearance

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

Haze and blooming on PPO surface

A

PPO haze is the surface mapping of multiple factors of moisture, temperature, and speed; item-by-item investigation starts from drying; cavity surface consistency is the basic guarantee.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent re...

Material Drying PPO; haze; surface; gloss; mold temperature; air entrapment

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

High internal stress and easy cracking of PPO

A

The high internal stress of PPO is the inherent result of rigid molecular chains; annealing post-treatment is industry practice; stress cracking verification must simulate the actual media environment.; after confirming effectiveness, solidify the parameters and practices into the work instructio...

Production & Quality PPO; internal stress; cracking; annealing; mold temperature; solvent

Q

PPO gate jetting snake patterns

A

PPO jetting marks are an exclusive defect explicitly pointed out by material suppliers; gate form selection is more curative than parameter adjustment; multi-stage injection is an effective process compensation means.

Injection Molding PPO; jetting; snake patterns; gate; fan gate; multi-stage injection

Q

Insufficient filling due to poor PPO flowability

A

The root of PPO filling problems lies in the material flowability; high pressure and high speed is the standard process orientation; designing the mold runners for high-viscosity materials is a prerequisite.; after confirming effectiveness, solidify the parameters and practices into the work inst...

Injection Molding PPO; filling; flowability; viscosity; short shot; high pressure and high speed

Q

Degradation from PPO melt temperature out of control

A

PPO degradation is the cumulative effect of the product of temperature and time; low melt temperature and short cycles are the basic principle for protecting molecular weight; the 300℃ thermal stability boundary cannot be used as a process target.

Processing Machinery PPO; degradation; melt temperature; residence time; molecular chain; yellowing

Q

Silver streaks and bubbles from insufficient PPO drying

A

PPO's low water absorption easily makes people relax drying management; the 0.05% moisture content red line must be quantitatively verified; drying is the lowest-cost defect prevention means.

Material Drying PPO; silver streaks; drying; bubbles; moisture content; 110℃

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