Material Drying
4 조회수
EVOH barrier property decreases after moisture absorption
문제 현상
After EVOH is exposed to humidity >80%RH for 24h, OTR increases from 0.1 to 10cc/m²·24h
원인 분석
EVOH vinyl alcohol groups are strongly hydrophilic; after moisture absorption, hydrogen bonds are destroyed by water molecules and barrier properties drop sharply
해결 방법
1) Sandwich the EVOH layer between PE layers to prevent moisture absorption; 2) Increase EVOH layer thickness to 15-20μm to compensate moisture absorption loss; 3) Multi-layer coextrusion with EVOH not exposed on the outer layer; 4) Avoid long-term high-humidity exposure after package sealing
핵심 요약
EVOH moisture absorption causing a sharp drop in barrier property is its inherent characteristic, requiring sandwich structure protection
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!