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일반적인 플라스틱 재료 문제에 대한 실질적인 답변

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Q

ABS check ring wear causing alternating short shot/flash

A

For ABS alternating short shot and flash, suspect the check ring first: this is a typical fault signal of the metering system; only by stabilizing the cushion do the process parameters make sense, otherwise the more you adjust, the more chaotic it gets.

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

Q

ABS hopper bridging, unstable feeding

A

ABS 'if the feeding is unstable, no matter how accurate the process is, it is in vain': bridging and crushed material are common culprits; include the plasticizing time in monitoring, it often alarms before the product has problems.

Molding Process ABS；bridging；hopper；feeding；crushed material

Q

ABS mold sticking (difficult demolding)

A

For ABS mold sticking, first 'reduce pressure and temperature', then 'repair the draft angle and polishing', and finally deal with vacuum adsorption; the polishing quality along the demolding direction often affects the demolding feel more than the draft angle.

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

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 brittle cracking——product structure stress concentration

A

A sharp corner in the ABS structure is the starting point of a crack: rounded corners, uniform wall thickness, and reasonable reinforcing ribs are the three structural means to prevent brittleness; many 'material brittleness' cases are actually mines buried by the design, and must be removed from...

Molds & Tooling ABS；brittle cracking；stress concentration；sharp corner；rounded corner；structural design

Q

ABS brittle cracking——raw material purity and additive problems

A

If ABS brittleness 'gets better after changing material', the problem is in the raw material rather than the process: purity, molecular weight distribution, and additive compatibility are the three gates; no matter how good the process is, it cannot save congenitally poor material.

Material Analysis ABS；brittle cracking；raw material purity；additive；molecular weight distribution

Q

ABS brittle cracking——draft angle and insert problems

A

ABS's draft angle and insert preheating are often overlooked: insufficient draft angle plus forced ejection = cracking, no insert preheating = interface stress cracking; these two details of structural parts must be fixed at the design stage.

Molds & Tooling ABS；brittle cracking；draft angle；insert；shrinkage difference；preheating

Q

ABS brittle cracking——improper screw plasticizing parameters

A

ABS screw parameters should be 'moderate': the speed and back pressure are not the higher the better, shear heat is an invisible degradation source; using the actual melt state as the criterion is more reliable than memorizing the parameter table.

Processing Machinery ABS；brittle cracking；screw speed；back pressure；shear heat

Q

ABS brittle cracking——unreasonable temperature parameters

A

ABS temperature is a 'double-edged sword': too low causes under-plasticization brittleness, too high causes degradation brittleness; set the range according to the grade, adjust the rear section according to the regrind, and judge by the melt state rather than the displayed temperature, only then...

Processing Machinery ABS；brittle cracking；melt temperature；plasticizing；degradation；temperature window

Q

ABS brittle cracking——improper mold temperature and cooling

A

ABS mold temperature should be set 'differentiated' according to wall thickness: raise the temperature for thick walls to ensure welding, lower the temperature for thin walls to prevent deformation; mold temperature is neither the higher the better nor the lower the better, uniformity and matchin...

Molds & Tooling ABS；brittle cracking；mold temperature；weld line；cooling

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