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Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

740 perguntas
Q
MP hardness too low
A
low hardness is caused by material softness and excessive plasticization; adding filler is key
Molding Process MP hardness too low rigid filler plasticizer crystallization control
Q
MP large impact strength fluctuation
A
impact fluctuation is caused by dispersed phase and crystallization instability; stable processing is key
Molding Process MP impact fluctuation dispersed phase particle size nucleating agent processing stability
Q
MP poor antistatic effect
A
poor antistatic effect is caused by insufficient addition; increasing antistatic agent is key
Molding Process MP antistatic antistatic agent surface resistance migration rate
Q
MP processing temperature fluctuation
A
temperature fluctuation is caused by an improper temperature control system; PID tuning and heater band replacement are key
Molding Process MP temperature fluctuation PID tuning heater band thermocouple
Q
MP large compression set
A
large compression set is caused by insufficient crosslinking; increasing crosslinking degree is key
Molding Process MP compression set crosslinking degree elastic recovery reinforcing filler
Q
MP surface stress whitening
A
stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
Molding Process MP stress whitening orientation stress annealing stress concentration
Q
MP compression molding incomplete curing
A
MP thermoset curing requires the three parameters of temperature, time and pressure to be sufficient
Molding Process MP compression molding incomplete curing curing temperature curing time compression pressure
Q
MP internal coarse crystallization
A
coarse crystallization is caused by slow cooling; fast cooling and nucleating agent are key
Molding Process MP coarse crystallization spherulite refinement nucleating agent cooling rate
Q
MP extruded film thick edges thin middle
A
U-shaped thickness is caused by die flow channel and swell difference; coat-hanger die and gap fine-adjustment are key
Molding Process MP film thickness distribution coat-hanger die gap fine-adjustment edge effect
Q
glass fiber aspect ratio too large affecting processing
A
excessive aspect ratio is caused by initial fibers being too long; selecting chopped fibers is key
Molding Process glass fiber aspect ratio chopped fiber fiber length aspect ratio control fiber entanglement
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