From the point of view of raw materials and process flow, the reasons for the adhesion of the composite film come from the following eight aspects: the wrong proportion of adhesive, improper storage of adhesive, water content of diluent, residual alcohol, residual solvent, excessive coating amount of adhesive, insufficient aging and additives.
1. The adhesive ratio is wrong, and the weight of the adhesive is wrong, resulting in insufficient curing. In this regard, all materials should be weighed and recorded to facilitate inspection; secondly, the prepared adhesive should be fully stirred in the right way to avoid local uneven mixing.
2. Improper storage of adhesive, incomplete sealing of curing agent, reaction with moisture in the air, consumption of another part, resulting in insufficient content of curing agent after mixing. Therefore, check the sealing condition of the adhesive before use.
3. The diluent contains water. The purity of the diluent is not high and contains excessive moisture. The proportion of adhesives is out of proportion due to alcohols. The storage of diluent should be sealed to prevent water vapor from entering. The water content of diluent should be tested regularly.
4. Alcohol residue the alcohol component of alcohol soluble ink or ink thinner is not dried, so that it reacts with curing agent and causes sticky. Alcohol soluble ink should use alcohol soluble adhesive, printing solvent should not use alcohol ratio.
5. There are too many residual solvents in the solvent residual composite, and the solvent is wrapped in the adhesive, which hinders the curing. Often check whether the air inlet and exhaust of the drying system is normal, and control the compound speed when the glue amount is large.
6. Too much adhesive coating, too much adhesive coating, too large film roll diameter, resulting in slow internal hardening of adhesive. Adhesive coating to be appropriate, mature to be sufficient.
7. Insufficient aging, too low aging temperature, slow curing and insufficient crosslinking. Appropriate curing temperature and time should be selected. If necessary, fast curing adhesive should be selected.
8. The influence of additives in the composite membrane substrate, such as the additives in PVDC can delay and prevent the crosslinking and curing of the adhesive, the softener in PVC can react with - NCO group of the curing agent, and the plasticizer of soft PVC can penetrate into the adhesive, which will reduce the adhesive force and thermal stability. Therefore, the amount of curing agent should be increased appropriately.
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.
We uphold the integrity of cooperation, good quality, thoughtful service business philosophy, the industry's recognition, products sold all over the world; welcome to call friends from all walks of life
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