Problem & Lösung

Praktische Antworten auf häufige Herausforderungen mit Kunststoffmaterialien

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Q

ABS trapped air burning

A

Repeated burning at a fixed position in ABS = venting problem: first clean/open the vent grooves, then adjust the end speed; the burning point is often the last filling point, and the short shot method can locate it precisely.

Injection Molding ABS；burnt；trapped air；diesel effect；vent groove

Q

ABS injection cycle too long, low capacity

A

To reduce the ABS cycle, first 'cut the cooling': start with water circuit efficiency and wall thickness, conformal water circuits are a sharp tool; the bulk of the cycle is cooling, don't spend all your energy on the few seconds of injection.

Injection Molding ABS；molding cycle；cooling time；water circuit；conformal cooling

Q

ABS cushion fluctuation causing alternating short shot and flash

A

When short shots and flash appear alternately, suspect the check ring first.

Injection Molding ABS；check ring；cushion；metering instability；backflow

Q

Glass fiber reinforced ABS floating fiber

A

GF-ABS floating fiber relies on 'temperature coating': heating up and slowing down lets the resin wrap the fibers; GF parts with high appearance requirements need process, texture, and grade cooperation, and are difficult to eradicate by machine adjustment alone.

Injection Molding ABS；glass fiber reinforcement；floating fiber；coating；mold temperature

Q

Flame retardant ABS mold corrosion and precipitation

A

Flame retardant ABS='narrower processing window + stronger mold protection': temperature control, corrosion prevention, strong venting, and shutdown replacement—the four-piece set is indispensable; flame retardant materials are more demanding on equipment and process.

Injection Molding ABS；flame retardant；corrosion；precipitation；venting

Q

ABS burnt (trapped air burn marks)

A

Repeated burning at a fixed position=venting problem; clean the vent grooves first.

Injection Molding ABS；burnt；trapped air；diesel effect；vent groove

Q

ABS jetting marks (snake marks)

A

For ABS jetting marks, 'let the material hit the wall first when entering': the gate design cooperates with the speed curve so that the front adheres to the wall and spreads as soon as it enters the cavity, and the snake marks disappear immediately, which preserves capacity better than simply red...

Injection Molding ABS；jetting marks；snake marks；gate；injection speed

Q

ABS injection sink mark

A

For ABS sink marks, 'first manage the structural wall thickness, then manage the holding compensation': rib thickness and thick walls are the root, holding and freeze-off are the technique; only piling holding pressure on the machine without touching the structure easily introduces internal stres...

Injection Molding ABS；sink mark；shrinkage；rib position；holding pressure；freeze-off

Q

ABS injection warpage deformation

A

The main cause of ABS warpage is 'stress and uneven cooling' rather than crystallization shrinkage: balancing mold temperature, restraining holding pressure, and sufficient cooling are the main lines; ABS is easier to adjust than PP/PE, but ignoring uneven cooling still causes warpage.

Injection Molding ABS；warpage；uneven cooling；differential shrinkage；holding pressure

Q

ABS injection flash (burrs)

A

For ABS flash, first reduce the process pressure, then check the mechanical clamping and mating: reversing the order easily crushes the venting and accelerates mold wear; flash in individual cavities requires checking the filling balance rather than adjusting the overall pressure.

Injection Molding ABS；flash；burr；clamping force；parting line

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