Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

Gel particles / fish eyes

A

The essence of gel particles (fish eyes) is ultra-high molecular weight components or cross-linked gels in the resin that are not completely melted. The solution approach is "heat up + filter + change material": increase plastication temperature to ensure full melting, use screens to filter gel p...

Extrusion & Post gel particles fish eyeshigh molecular weight componentsplastication temperaturescreen filtrationresin purity

Q

Discoloration / burnt / black specks

A

This problem is a typical manifestation of discoloration / burnt / black specks in extrusion molding. The core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, speed, pressure) and precision correction of the die/...

Extrusion & Post degradation yellowingprocessing temperatureresidence timeheat stabilizerPVC dehydrochlorination

Q

Bamboo pattern / pulsating extrusion

A

The essence of the bamboo pattern is periodic instability in the matching of extrusion and haul-off speeds. The core of the solution is to eliminate speed fluctuation sources — stabilize the screw rotation speed transmission system, optimize the temperature control PID to eliminate periodic tempe...

Extrusion & Post bamboo patternextrusion-haul-off matchingscrew rotation speed fluctuationtemperature control PIDuniform feeding

Q

Melt fracture/sharkskin

A

The essence of melt fracture is that the die wall shear stress exceeds the critical shear stress of the polymer melt. The solution idea is 'reduce shear + modify interface': lower the extrusion speed or raise the die temperature to reduce the shear rate, and use PPA processing aids to improve the...

Extrusion & Post melt fractureshear stressdie temperatureextrusion speedPPA processing aid

Q

Pipe bending/not straight

A

The essence of pipe bending is that longitudinal cooling asymmetry or axis deviation causes inconsistent shrinkage rates on each side. The core of the solution is to ensure that the cooling system is coaxial with the extrusion axis and that circumferential cooling is uniform, while eliminating tr...

Extrusion & Post pipe bendingcooling uniformitytraction deflectiondie temperaturecoaxiality

Q

Uneven release agent coating

A

This problem is a typical manifestation of uneven release agent coating in transfer molding; the core of the solution lies in the rational design of the runner and gate system, the effective transmission of transfer pressure, and the uniform control of mold temperature. It is recommended to start...

Extrusion & Post draft anglemold polishingholding pressurecooling timerelease agent

Q

Excessive Release Agent

A

This problem is a typical manifestation of excessive release agent in the RIM process; the core of the solution lies in ensuring the precise ratio and full mixing of the two components, while controlling the reaction temperature and curing conditions within the optimal window. It is recommended t...

Extrusion & Post demolding draft anglemold polishingholding pressurecooling timerelease agent

Q

Delamination / Peeling

A

This problem is a typical manifestation of delamination/peeling in '2079851475616104452; the core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, pressure, speed) and rationality checks of mold design. It is reco...

Extrusion & Post delaminationtemperaturematerial

Q

Jetting / Jetting Mark

A

This problem is a typical manifestation of jetting/jetting marks in '2079851475616104452; the core of the solution lies in eliminating the root cause of the defect through systematic optimization of process parameters (temperature, pressure, speed) and rationality checks of mold design. It is rec...

Extrusion & Post jetting markgate sizeinjection speedcold slug wellsnake-shaped mark

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