Problems and improvement methods of water-based la

2022-10-24
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FM bridge laminating machine water-based laminating adhesive problems and improvement schemes

at present, there are many tensile testing machines used to test the tensile properties of materials on the market.

water-based laminating adhesive is accepted by users because of its good environmental protection, no harm to human body and the environment, low power consumption, low cost, no diluent, and small amount of glue, replacing the oily laminating adhesive diluted with toluene that pollutes the environment

the water-based laminating adhesive is compounded and coated evenly on the FM bridge laminating machine, with less coating amount, strong adhesion, and strong product brightness and clarity

but there are problems in the gluing Department: at present, the domestic production bridge laminating machine can accept magnet scanning and field scanning methods, and the search part adopts roller reverse gluing

the reverse gluing method of the roller is: the direction of the gluing roller is the same as that of the squeegee roller. There is a squeegee plate on the squeegee roller to scrape the excess glue. The amount of glue is controlled by the gap between the gluing roller and the squeegee roller. The speed of the machine is basically the same. The linear speed of the glue coating roller and the glue scraping roller is basically about 2..2. The glue coating roller is fast and the glue scraping roller is slow

after the reversing rubber coating roller and rubber scraping roller are quenched and tempered with 45 pipe, the outer diameter is chrome plated and then refined. The outer diameter runout is controlled within 0.01mm, and the gloss is between 0.4-0.8

due to the use of water-based laminating adhesive, there are chrome removal, chrome blistering and rust, resulting in two rolls unable to glue, uneven glue application and dot shaped, resulting in the scrapping of laminating products. After replacing the new roll, there was de chrome and chrome blistering in the first half of the year, causing losses to manufacturers and customers

in the past, it was thought that the quality of chromium plating was poor, and the same problem occurred in several chrome plating plants, but the customers who used oil-based adhesive coating did not have the problem of chromium removal and chromium foaming. Therefore, it is judged that there are acid and alkali in the water-based laminating adhesive. In addition, water is used to clean the roller. In some areas, there are alkali or salt in the well water, forming acid and alkali or salt decay, and the roller appears to be dechromated and rusted

solution

the water-based laminating adhesive needs to change the material of two rollers and the gluing method:

1. The use of stainless steel rollers instead of chromium plating rollers solves the problem of chromium removal, but because the runout of stainless steel can only be controlled at 0.02mm, the thickness of gluing is uneven, resulting in uneven surface brightness of laminating products, serious glue consumption and high cost

2. the coating roller adopts 255 dangerous house ceramic roller, scrape off the excess glue with a scraper, and apply the glue evenly, but the cost of the ceramic roller is high, and the amount of glue depends on the density of the line, so there is little choice

3. the rubber roller is used for the rubber coating roller, and the rubber scraping roller is made of stainless steel. The runout of stainless steel is eliminated by the rubber elasticity. The rubber coating roller/PAN turns, and the rubber scraping roller reverses. The two rollers are driven by synchronous teeth, and the linear speed of the two rollers is the same. The glue amount is controlled by the pressure of the two rollers. The speed of the machine affects the glue amount. The glue is evenly applied, but the glue is torn by the two rollers to form dots. The high viscosity glue is more obvious, and there are a few white spots after lamination, which is not suitable for high-grade paper

4. rubber roller is used for rubber coating, stainless steel is used for rubber scraping roller, and the gloss of stainless steel is controlled within 0.8. The rubber scraping roller is stationary and does not rotate. The glue amount is controlled by the pressure of two rollers. The speed of the machine affects the glue amount, and the glue amount is uniform. However, there are longitudinal lines, which affect the lamination effect and require high cleanliness of glue, so it is inconvenient to clean the squeegee roller

5. the rubber coating roller adopts rubber roller, the rubber scraping roller adopts stainless steel, and the rotation direction of the rubber coating roller is the same as that of the rubber scraping roller. The squeegee of the squeegee roll adopts a rubber squeegee. The squeegee roll should be very slow. The linear speed of the two rolls is between 4.5 ~ 5.5. The glue amount is controlled by the pressure of the two rolls. The speed of the machine affects the glue amount. The glue amount is uniform. It is suitable for a wide range of paper, no white spots, and oily laminating glue and glue application. It is very economical and applicable

only youth that has made contributions to the people 6. Rubber roller is used for rubber coating roller, stainless steel is used for rubber scraping roller, and both rubber coating roller and rubber scraping roller are controlled by a separate motor. The rubber scraping roller can rotate clockwise, and the belt scraper can also reverse, forming a low speed. Between the line ratio, the glue amount is controlled by the pressure of the two rollers and the glue scraping speed. The speed of the machine affects the glue amount

the glue is evenly applied, which is suitable for all kinds of laminating glue and all kinds of printing paper lamination. There is a large choice. The finished laminating product has high gloss, high definition and no white spots, but the cost of this mechanism is high

(author/zhangbaoding)

source of information/China Packaging News

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