Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

COC Cracking in High Temperature and High Humidity Environment

A

COC damp heat cracking is protected by the dual protection of formulation stabilization and low-stress process; antioxidant content is a key indicator when selecting grades; damp heat verification cannot be omitted.; After confirming effectiveness, fix the parameters and practices into the work i...

Material Drying COC; damp heat; cracking; antioxidant; aging; storage

Q

COC Improper Screw Speed Poor Plasticizing

A

COC plasticizing parameters have a clear official window; screw speed and back pressure are adjusted in linkage; actual melt measurement is the final basis for judging the plasticizing state.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent re...

Processing Machinery COC; screw speed; plasticizing; unmelted particles; shear; window

Q

COC Excessive Back Pressure Degradation

A

COC back pressure 150 bar is the red line drawn by the supplier; mixing demand cannot be solved by exceeding back pressure; the damage of shear heat to high-viscosity materials is often underestimated.

Material Analysis COC; back pressure; shear heat; degradation; 150bar; mixing

Q

COC Hot Runner Internal Heating Failure

A

COC hot runner selection follows the material supplier's recommendation: external heating first; the uncontrollable temperature zone of internal heating is a breeding ground for degradation and blockage; the gate temperature must be actually measured.

Molds & Tooling COC; hot runner; external heating; gate; temperature control; degradation

Q

COC Pre-filled Syringe Molding Defects

A

COC pharmaceutical packaging material molding is based on the PDA process window; temperature control of deep-cavity parts is the core of dimensional accuracy; pharmaceutical packaging material inspection must give equal weight to function and appearance.; After confirming effectiveness, fix the ...

Injection Molding COC; syringe; pre-filled; wall thickness; sealing; pharmaceutical packaging material

Q

COC Microfluidic Chip Poor Bonding

A

COC microfluidic bonding is a precise balance of temperature, pressure and cleanliness; the narrow window requires high temperature control accuracy of the equipment; each batch of bonding parameters needs to be sampled by destructive testing.

Molding Process COC; microfluidics; bonding; thermocompression; channel; Tg

Q

COC Optical Distortion Birefringence

A

The birefringence of COC optical parts shares the same origin as internal stress; a low-stress process is a prerequisite for optical performance; polarized light inspection should be incorporated into the standard inspection process for optical parts.

Injection Molding COC; birefringence; optics; internal stress; polarized light; annealing

Q

COC Bubbles and Vacuum Bubbles

A

COC bubbles need to be treated according to the two causes of air entrapment and vacuum; bubble inspection of transparent parts should use optical methods; low hygroscopicity does not mean they can be stored open.

Injection Molding COC; bubble; vacuum bubble; air entrapment; holding pressure; transparent

Q

COC Obvious Weld Lines

A

COC weld lines have nowhere to hide on transparent parts; the gate scheme can cure the problem more radically than process adjustment; weld line planning for optical parts should be completed at the mold design stage.; After confirming effectiveness, fix the parameters and practices into the work...

Injection Molding COC; weld line; transparent; gate; confluence; optics

Q

COC Flash

A

COC high-pressure injection process has high requirements on clamping and mold precision; flash treatment first checks hardware gap then adjusts process; transparent part flash should take mold repair as the ultimate solution.

Injection Molding COC; flash; clamping force; parting line; injection pressure; trimming

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