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Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

740 perguntas
Q
Large compression set of PU
A
Large compression set is caused by insufficient crosslinking; increasing crosslinking degree is key
Molding Process PU compression set crosslinking degree elastic recovery reinforcing filler
Q
Surface stress whitening of PU
A
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
Molding Process PU stress whitening orientation stress annealing treatment stress concentration
Q
High density of PU rigid foam
A
PU rigid foam density is determined by blowing agent dosage and catalyst
Molding Process PU rigid foam high density blowing agent isocyanate index catalyst
Q
Coarse internal crystallization of PU
A
Coarse crystallization is caused by slow cooling; fast cooling and nucleating agent are key
Molding Process PU coarse crystallization spherulite refinement nucleating agent cooling rate
Q
PU Extruded Film Thick Edges and Thin Middle
A
U-shaped thickness is caused by die flow channel and swell differences; coat-hanger die and gap fine-tuning are key
Molding Process PU filmthickness distributioncoat-hanger diegap fine-tuningedge effect
Q
EVOH Hardness Too Low
A
Low hardness is caused by material softness and excessive plasticization; adding filler is key
Molding Process EVOHlow hardnessrigid fillerplasticizercrystallization control
Q
Large EVOH Impact Strength Fluctuation
A
Impact fluctuation is caused by unstable dispersed phase and crystallization; stable processing is key
Molding Process EVOHimpact fluctuationdispersed phase particle sizenucleating agentprocessing stability
Q
Poor EVOH Antistatic Effect
A
Poor antistatic effect is caused by insufficient addition; increasing antistatic agent is key
Molding Process EVOHantistaticantistatic agentsurface resistancemigration rate
Q
Poor EVOH Chemical Resistance
A
Poor chemical resistance is caused by EVOH chemical affinity; selecting chemical-resistant grade and coating are key
Molding Process EVOHchemical resistancechemical attackslight crosslinkingsurface coating
Q
EVOH Processing Temperature Fluctuation
A
Temperature fluctuation is caused by improper temperature control system; PID tuning and heater band replacement are key
Molding Process EVOHtemperature fluctuationPID tuningheater bandthermocouple
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