Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

Local over-thinning in ABS '2079851475616104458

A

ABS deep drawing must rely on a plug to 'deliver' the material to the corner: plug assist + zone heating + thicker sheet work together; local over-thinning is a material distribution problem, not something that can be solved by simply adjusting the temperature.

Thermoforming ABS；'2079851475616104458；wall thickness too thin；draw ratio；plug assist

Q

ABS extrusion die lip buildup (die drool)

A

ABS die drool=the accumulation of 'residence degradation': cleaning treats the symptoms, temperature-speed matching treats the root; the interval pattern of periodic scoring lines can be used to deduce the buildup shedding cycle, facilitating the formulation of the maintenance rhythm.

Extrusion & Post ABS；extrusion；die lip buildup；die drool；degradation

Q

Melt fracture on ABS extrusion surface

A

The main line for ABS extrusion surface roughness is 'reducing outlet shear': raise temperature, reduce speed, polish, and add PPA in sequence; when pursuing output, find the balance point between speed and surface quality.

Extrusion & Post ABS；extrusion；melt fracture；sharkskin；die temperature

Q

ABS stress cracking (solvent induced)

A

ABS 'stress + solvent = cracking': reducing internal stress and avoiding solvents both work together; residual stress is a time bomb, the solvent is just the fuse, and high-stress parts must have the stress reduced from the process.

Production & Quality ABS；stress cracking；solvent；annealing；residual stress

Q

ABS dimensional instability

A

For ABS dimensional drift, first check 'plasticizing and metering stability': the cushion and check ring are the primary suspects; dimensions are the result of process stability, fix the process variables and the dimensions will naturally be stable.

Molds & Tooling ABS；dimensional instability；shrinkage rate；check ring；cushion

Q

ABS ejection whitening (stress whitening)

A

ABS ejection whitening=an alarm of 'ejection force exceeding the standard': disperse the ejection force, give sufficient cooling, and reduce the gripping force to eliminate it; the ejection whitening position is the ejector pin position, and following it to find the cause is the fastest.

Molds & Tooling ABS；ejection whitening；stress whitening；ejection force；cooling

Q

Poor ABS demolding (mold sticking)

A

For mold sticking, first reduce pressure and temperature, then check the draft angle and polishing.

Molds & Tooling ABS；mold sticking；draft angle；gripping force；polishing

Q

ABS delamination and peeling

A

For ABS delamination, first check 'compatibility and contamination': mixing, color masterbatch carrier, and purging are the three major suspects, don't suspect the process first; delamination is an interface problem, and only by finding the pollution source can it be cured.

Material Drying ABS；delamination；peeling；compatibility；contamination

Q

ABS discoloration (yellowing)

A

ABS yellowing='a record of thermal history': controlling temperature, limiting time, and reducing shear simultaneously; the actual melt temperature is often higher than the setting, shear heat must be measured, and the drying step cannot be ignored either.

Material Drying ABS；yellowing；thermal degradation；melt temperature；shear heat

Q

ABS black specks (carbonized specks)

A

ABS black specks mostly come from dead corner carbon deposits or material source contamination: purging is more effective than adjusting parameters; intermittent appearance is a typical feature of dead corner accumulated material, don't treat an equipment problem as a process problem.

Molds & Tooling ABS；black specks；carbonization；dead corner；purging

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