Problem & Solution

Practical answers to common plastic material challenges

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Q

PC Cracking Around Inserts

A

PC insert parts = triple insurance of 'preheating + wall thickness + low stress': PC is most sensitive to stress, and the insert interface is a disaster area; do not use inserts if possible, and if they must be used, do the three things well.

Molding Process PC; insert; cracking; preheating; stress

Q

PC/ABS Warpage

A

PC/ABS large flat part warpage = 'cooling balance + holding restraint': as an amorphous blend, stress management is the main line; large parts especially need the mold temperature field made uniform.

Molding Process PC/ABS; warpage; cooling balance; holding pressure; annealing

Q

PBT Ultrasonic Welding

A

Ultrasonic welding is PBT's supporting advantageous process; parameters and energy director design determine weld quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PBT; ultrasonic welding; weld; energy director; parameters

Q

PBT Voids and Sink Marks

A

The difficulty of PBT voids and sink marks lies in fast solidification and a short window; precise holding and structural thinning are used together; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PBT; void; sink mark; holding pressure; fast solidification

Q

PBT Glass Fiber Reinforced Warpage Mechanism

A

The essence of PBT/GF warpage is fiber orientation plus induced crystallization; when process improvement is limited, material-side anti-warpage formulation is the radical cure route; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurr...

Molding Process PBT; glass fiber; warpage; induced crystallization; anisotropy

Q

PBT Shrinkage Rate 1.5-2.8%

A

PBT has large shrinkage and strong directionality; allowance must be calculated by direction, and mold-trial correction is the necessary path for precision parts; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PBT; shrinkage rate; 1.5-2.8%; directionality; allowance

Q

PBT glass fiber reinforced warpage

A

PBT reinforced warpage is a typical manifestation of shrinkage anisotropy; gate design and filler form (fiber changed to beads) are the main countermeasures.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PBT; glass fiber reinforcement; warpage; orientation; shrinkage; gate

Q

PARA Rib Plate Edge Effect

A

The edge effect of PARA rib plate design is a material characteristic; thickness ratio and position are design variables; simulation analysis predicts deformation in advance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molding Process PARA; rib plate; edge effect; fiber orientation; thickness; simulation

Q

PA6 Weld Line Strengthening

A

Weld lines cannot be eliminated, only strengthened and avoided, and venting plus overflow are the key measures; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting refer...

Molding Process PA6 weld line strength overflow well

Q

PA6 Thick-Wall Sink Marks and Burnt

A

Thick-wall PA6 parts need prevention of both sink marks and overheating; holding compensation and cooling enhancement work in both directions, and the gate channel is the throat of feeding compensation; after confirming effectiveness, solidify the parameters and practices into the work instructio...

Molding Process PA6; thick wall; sink mark; vacuum void; feeding compensation

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