There are two reasons for the degradation of the composite film after the composite film is placed for a long time or the composite fastness of the packaging content declines. One is that the adhesive does not have functionality, and the other is that there are too many additives in the inner film. In view of this problem, this paper gives three solutions for the reference of soft package industry colleagues.
However, the peeling force between the inner film and the PET film of vm-pet will be reduced if the material is placed for a long time, such as half a month, a month or longer; or after some contents are packed, especially the corrosive medium (acid, spicy, salty, wine, oil, surfactant, mothproof agent, etc.), or After pasteurization or boiling disinfection, the composite material appeared wrinkle and separation phenomenon.
One reason is that the adhesive does not have the function, and the other is that there are too many additives in the inner film.
Three solutions: 1. Select high-quality functional adhesives. This kind of adhesive has excellent properties of resisting medium and boiling, and can resist the erosion of various substances such as acid, spicy, salty, wine, oil, surfactant, household insecticide, spices, etc., and can withstand pasteurization or boiling sterilization test.
2. PE film with less additive content is selected as the inner layer of the composite. At present, PE film with additive content less than 300ppm is called low smoothness film, the content of 300-500ppm is called medium smoothness film, and the content of 500-800ppm is called high smoothness film. If the PE film with low smoothness is used, the problem of low peeling force or fading of fastness will not occur. If the PE film with medium smoothness, especially with high smoothness, there will be quality problems. In some special cases, the PE film with additive up to 1300ppm should be used. For example, for refrigerated food packaging bags with skylight, special high content antifogging PE film should be used. At this time, many adhesives are not suitable. The peeling force between layers is less than 0.6n/15mm when the composite is just compounded and matured. Therefore, using PE film with less additives as inner layer of composite is one of the methods to avoid quality failure. 3. Use special adhesive. If you must use high smoothness PE film, you need to choose a special adhesive.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, a world famous manufacturing city, is a subsidiary company of Beite packaging (China) Co., Ltd
With an area of 6000 square meters, it is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of advanced production equipment in China
We provide customers with high-quality products and first-class service with the support of the humanized management system and a group of experienced technical personnel.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for food, daily chemicals, and other special-shaped bags
Electronic, toys, medicine, cosmetics, industrial products and other industries of internal and external packaging.
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