Problem & Solution

Practical answers to common plastic material challenges

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Q

LCP Dimensional Fluctuation and Batch Instability

A

LCP's low shrinkage amplifies process fluctuations; metering and mold temperature stability are the keys to dimensions; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling dimensional fluctuation check ring mold temperature accuracy SPC

Q

LCP Burning and Discoloration

A

For LCP burning, check venting and dead-spot stagnation first; residence time is a red line for high-temperature materials; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling burnt discoloration trapped air stagnation degradation

Q

Brittle Fracture of LCP Products

A

For LCP brittle fracture, the three factors of degradation, hydrolysis and orientation must be investigated simultaneously; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troublesh...

Material Drying brittle fracture molecular degradation weld line sudden thickness change

Q

LCP Flash and Overflow

A

Low-viscosity LCP is extremely sensitive to mold fitting accuracy; mold repair and clamping take priority over pressure reduction; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling flash low viscosity clamping force parting line

Q

LCP Short Shot and Incomplete Filling

A

LCP short shots are mostly due to rapid crystallization sealing; raising mold temperature, speeding up and venting take priority over raising melt temperature; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling short shot rapid crystallization mold temperature venting

Q

LCP Screw Wear and Check Ring Leakage

A

Glass-fiber LCP is highly abrasive; check ring leakage can disguise itself as process fluctuation and must be regularly checked; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding screw wear check ring metering fluctuation glass fiber

Q

LCP Nozzle Drool and Stringing

A

Low-viscosity LCP must be paired with a small-orifice nozzle plus suck-back, tackling drool with both measures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding nozzle drool small-orifice nozzle stringing suck-back

Q

LCP Warpage and Anisotropic Shrinkage

A

Anisotropy is the root cause of LCP warpage; selecting a mineral-filled grade plus symmetric orientation is most effective; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling warpage anisotropy mineral filling shrinkage rate

Q

Large Drop in Weld Line Strength of LCP

A

LCP weld lines are inherently weak; design avoidance and overflow well transfer are more effective than machine adjustment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process weld line butt weld overflow well strength drop

Q

Air Entrapment Blistering When LCP Thin Wall Fills into Thick Sections

A

Thin wall entering thick wall easily entrains air; adjusting flow direction and venting is more effective than simply raising temperature; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive...

Thermoforming thin wall filling thick air entrapment vent groove gate position

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