[Discussion] In 0PP/PET-Al/PE, freeze delamination occurs between OPP and PET-Al — what causes it and how to solve it?
- In the OPP/PET-Al/PE structure, freeze-induced delamination occurs between OPP and PET-Al.
- The case uses Huangshan Meibang 2275 adhesive; other materials are fine, and the issue is delamination between OPP and PET metallized film after prolonged freezing.
- Wang reported no metallized-layer transfer, but white ink was printed on BOPP using Duofute ink; ink adhesion was poor, and benzene-free inks perform poorly on OPP.
- Suggested checks include PET corona value and unknown coating, metallized film quality or oxidation from overlong storage, adhesive mixing ratio/coating weight, and layer misalignment from uneven tension caused by temperature differences between materials.
- One view noted that if the PE layer delaminates, the PE and adhesive should be checked, and recommended freeze-specific PE grades with better elasticity to reduce temperature-difference effects.
Wang Xiaobing of Baotou Zhongxin: In 0PP/PET-Al/PE, freeze delamination occurs between OPP and PET-Al. What causes it and how to solve it?
A flexible packaging friend: What adhesive grade are you using? Is it freeze-resistant?
Wang Xiaobing of Baotou Zhongxin: It is Huangshan Meibang's 2275. The other materials are fine; it is just that between OPP and PET metallized film, delamination occurs after prolonged freezing.
Gao Feng of Huaxin Color Printing: There are many causes of delamination. If the inner layer does not delaminate, check whether there is metallized layer transfer?
Zhuhai Letong: It may be poor aluminum film quality, causing transfer of the metallized layer.
Chengdu Yongchangtai: Use type 121 PET.
Wang Xiaobing of Baotou Zhongxin: The aluminum layer has not transferred.
Jiang of Guangdong Hengchang Packaging: Test the PET corona value and check for any unknown coating.
Long Touhua of Modern Packaging: Usually this phenomenon is more likely to be metallized layer transfer.
Wanhe Paper & Plastic: Could the aluminum film have been stored too long?
Long Touhua of Modern Packaging: It is possible; if stored too long, it may have oxidized.
Wang Xiaobing of Baotou Zhongxin: But the aluminum film has not delaminated.
Chen Shaobo of Jiaxing Flexible Packaging: Was white ink printed on the BOPP?
Wang Xiaobing of Baotou Zhongxin: Yes, Duofute ink was used.
Chen Shaobo of Jiaxing Flexible Packaging: How is the ink adhesion?
Wang Xiaobing of Baotou Zhongxin: Not very good. When printed on OPP, all benzene-free inks are not good. Benzene-free ink prints very well on PA.
Chen Shaobo of Jiaxing Flexible Packaging: Then this possibility is relatively high.
Shenglong Color Printing Consumables Supplier: The coating weight also matters. If the adhesive mixing ratio is not properly controlled, this phenomenon can also occur.
Liu Xiaoyong of Nanjing Packaging: Could it be layer misalignment caused by uneven tension from temperature differences between materials? You could try an adhesive with better toughness.
Shenglong Color Printing Consumables Supplier: Actually, if it is the PE layer that delaminates, then you have to look for problems with the PE and the adhesive. There are PE grades made specifically for freezing; their elasticity is much better, so temperature differences will not affect them.
Wang Xiaobing of Baotou Zhongxin: Yes. (If you have different opinions, you are welcome to continue the discussion at Packaging Frontier Network www.pack168.com. Everyone is welcome to continue communicating on our website; friends who provide more solutions can receive reading points for technical articles on the website. To claim points, please contact Xiaoyang: 15813331361, Xiaolai: 18475695660.)
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