At present, various polyurethane adhesives on the market have different internal molecular structure, performance and price due to different manufacturers. In the selection of adhesives, we should not only meet the standard or use requirements, but also take into account the economy, instead of blindly pursuing excess quality, resulting in increased costs. Generally, it is decided by the nature and storage conditions of the packaged products, such as freezing or cooking, food or non food, etc.; the adhesive should be selected for composite films with different uses and different kinds of elemental films. For example, when there is no aluminum foil for general use, the general adhesive with moderate price can not only meet the standard and application requirements, but also reduce the cost. If there is aluminum foil composite, and is to package such as mustard, juice, soy sauce, peanuts and other food, it is necessary to select a special adhesive for aluminum foil with acid and spicy substances. In the process of composite aluminum foil and aluminum coating, the adhesive with higher molecular weight, more uniform molecular weight distribution, good solvent release and good coating performance should be selected. Although the adhesive with small molecular weight has good coating performance, it has strong intermolecular mobility and destroys the coating through the extremely thin aluminum layer. Cooking adhesive should be used in the manufacture of cooking bag, because the composite material will be layered when the common adhesive is cooked at high temperature, which will damage the packaging bag. The adhesive used in food packaging materials must have good resistance to medium erosion, because many foods contain fat, salt and acid substances, and the composition is very complex. The adhesive should have a stabilizer to the medium to avoid the layering of packaging materials due to the medium erosion. Do not choose the adhesive with high molecular weight, uneven distribution of molecular weight and poor solvent release, because the solvent itself has strong penetration capacity, which will damage the coating and affect the bonding strength. At the same time, the molecular weight of the adhesive with high molecular weight in the production process is inevitably uneven, and has poor affinity for aluminum coating, especially OPP printing film and BOPP printing film combined with aluminum coating film The surface is more obvious, mainly because of the high surface tension of the adhesive, poor coating performance, film shrinkage phenomenon, especially in the high-speed machine compound, the glue solution coating is not uniform, it is easy to cause "spots" phenomenon, resulting in product appearance quality problems.
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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