Control of glue quantity
The control here has two meanings, one is the amount of glue, the other is the problem of uniformity. The amount of glue is basically determined by the depth of gravure roll dot and glue concentration. But when these two factors are fixed, the gravure roll on the glue, how much by the rubber pressure roller hardness, pressure and scraper pressure.
The pressure of the scraper is small or even not tight, or there are mechanical impurities to jack up the gap, then the amount of glue is more. But the rubber pressure roller is very soft, the elasticity is very good, and the pressure is very big, then glue is also less. This point can be squeezed from the rubber pressure into the depth of the gravure roll dot, to drive out a part of the glue, so as to reduce the amount of glue transfer.
For dry compounding, whether the glue is uniform or not is the fundamental means to ensure the unity of quality. If the mechanical precision is not high, the scraper is not straight, or there are mechanical impurities on the left or right between the plate roller and the knife surface, and the pressure between the left and right sides is not the same, which will cause uneven gluing, and finally make the peeling strength of the composite unqualified, resulting in scrapping.
The solution is the same as that in gravure printing.
(1) The scraper should be checked frequently to ensure the straightness of the blade.
(2) Knife rest and version of the roller parallelism reliable, not before and after, one up and down.
(3) The scraper and roller should be checked frequently to remove the mechanical impurities between them.
(4) The pressure on the left and right sides of the rubber roller should be equal, and the elastic hardness of the rubber roller itself should be consistent. That is to say, when manufacturing the rubber roller, the mixing material should be uniform, the curing conditions should be the same, and the quality of any point should be the same.
(5) If necessary, according to the determination method of residual solvent in drying, check whether the glue amount on the left, middle and right points is equal. If any problem is found, correct it in time.
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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