Processing Machinery
3 조회수
LLDPE shear rigidity
문제 현상
After increasing screw speed, melt viscosity does not decrease noticeably, output improvement is limited and torque increases
원인 분석
LLDPE's short-chain branch structure lacks long-chain branch entanglement, with weak shear-thinning ability; it shows "rigidity during shear", with limited viscosity decrease under high shear and increased motor torque and wear
해결 방법
①Design screw and motor power according to LLDPE rheological properties; ②match high-viscosity grades with high-power extruders; ③avoid relying on high speed to increase output; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
LLDPE's shear rigidity is the core constraint of equipment selection; old equipment with insufficient power is inevitably limited when processing LLDPE; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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