Solving Uneven Shrinkage in POF Folded Films
author: Shenzhen Guangda Yuan Film Co., Ltd.
2025-06-04
Uneven shrinkage on POF folded films after heat treatment is a common challenge, but Shenzhen Guangdayuan's advanced technology offers precise solutions. Their POF folded films, crafted with a three - layer co - extrusion process (PE/PP/PE), address this issue through molecular orientation control developed in collaboration with Harbin Institute of Technology.
Guangdayuan's films feature a shrinkage rate difference of ≤5% between horizontal and vertical directions (standard: 70 - 80% horizontal, 10 - 15% vertical). The dual - axis temperature control system (±1℃ accuracy) in coating machines ensures uniform heating during production, while the automatic cutting equipment maintains fold line precision (±0.5mm error). Testing shows that films shrink to a surface flatness error of <0.3mm when heated at 180 - 200℃ with hot air circulation.
These films excel in diverse industries: food packaging (snacks, frozen goods), where uniform shrinkage ensures tight seals; electronics (component packaging), requiring precise fit for anti - static protection; and household appliances (surface protection), where aesthetic consistency matters. The 100% recyclable PE/PP material complies with FDA and EC 1935 - 2004 standards, ideal for eco - conscious applications.
With 20 + years of expertise and 16,000㎡ facilities, Guangdayuan guarantees that their POF folded films not only resolve shrinkage unevenness but also deliver long - term reliability—proven by 1,000 - hour weathering tests and 5kg drop resistance without cracking.
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