After decades of elimination and screening, solvent based two-component polyurethane adhesives are basically used in dry composite adhesives. So what are the characteristics of this polyurethane two-component adhesive used in composite soft packaging? This article will list 8 characteristics of dry composite adhesive for you.
Characteristics of polyurethane two-component adhesive used in soft packaging 1. In appearance: light color, good transparency, suitable for packaging. 2. Good adhesion: the composite flexible packaging uses a wide range of substrates, with different properties and different states of materials, which requires strong adaptability of adhesives and good adhesion to various materials, while polyurethane adhesives have good adhesion to paper, plastic film, aluminum foil and fabric. 3. Good softness: suitable for all kinds of base materials of flexible packaging, with good folding resistance and good elasticity. 4. Good processability: after continuous improvement, polyurethane adhesive for composite production can have good initial adhesion, good fluidity and wettability, and has strong adhesion with composite ink. 5. Good heat resistance: This is an extremely important requirement for composite flexible packaging processing. On the one hand, the packaged products have the requirements of pasteurization at 85 ℃, boiling sterilization at 100 ℃, high-temperature cooking at 121 ℃, and ultra-high-temperature cooking at 135 ℃. On the other hand, the composite film processing process needs to go through 60-90 ℃ drying channel and composite roller, and the bag making process should be resistant to 160-220 ℃ hot knife. 6. Cold resistance: at low temperature, it will not harden, brittleness and stratification. Many foods need to be frozen, refrigerated and stored. It can also be used when the temperature is low in northern winter. 7. Anti medium: after curing and crosslinking, polyurethane adhesive can resist most of the chemical media such as acid, spicy, fragrant and salt. 8. Good hygiene: no odor, safe. At present, FDA recognizes that aromatic polyurethane adhesives are only used in packages boiled below 100 ℃, while aliphatic polyurethane adhesives are only used for high-temperature cooking.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
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 the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
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