Liquid packaging film adhesion, this is the liquid packaging film maintenance and use of the process of more common problems, usually due to the production process details are not in place, among which the problem is more likely to appear in the ink, the following analysis why the liquid packaging film will pan adhesion phenomenon.
Adhesion of liquid packaging film, which is a common problem in the maintenance and use of liquid packaging film, is usually caused by the lack of detailed treatment in the production process, among which the problem is more likely to appear in the ink. Next, we will analyze why the liquid packaging film will appear adhesion phenomenon by Demao packaging.
After the plastic film is rolled up by intaglio, it is made into packaging bags by cutting and dividing. After stacking, the ink between printing surfaces or the ink and the blank surface of printing are adhered together, and cannot be separated (if the ink is pulled hard, the ink will fall off and the product will be scrapped). Should be from the possible causes of adhesion, that is, ink sticky, humidity is too high, too much pressure and so on.
1. Causes the adhesion intrinsic factor: the ink itself heat resistance is poor, has certain viscosity. When a large amount of solvent remains in the printing ink, it looks like the paint is not dry - although it looks dry to the naked eye, it is actually wet and sticky. After the printed matter is rolled up, the residual solvent is difficult to steam out, and the resin in the ink can not be dried and solidified, resulting in severe adhesion of the finished product. If the adhesive product is determined by gas chromatography, the residual solvent content often reaches tens of thousands of PPM, and the residual solvent will make the product contain odor. This not only affects the compound strength, but also affects the food flavor and hygiene scale. Starting from the function, drying premise and load of the dryer; secondly, use the fast drying flux as far as possible; finally, the printing materials should be kept moisture-proof, which is to prevent the moisture in the raw materials from swelling the resin in the ink and producing viscosity.
2. The proportion of the ink is not proper, causing sticky. If you need special function (heat-resistant, oil-resistant) ink, this kind of ink to add hardener, and hardener is a low molecular substance, it has viscosity. Resin heat resistance is poor, in the preparation of gravure ink with synthetic resin, the resin with high global softening point should be selected. Generally, the resin with global softening point between 105 ℃ and 0 ℃ is too low to heat resistance.
3. The winding is too tight. In the printing process, the film should not be too high tension or too long, too tight. As the printing machine does not stop running, the winding is increasing, especially in a part of the mesh hole is too deep, area is too large, easy to convex rib, adhesion will occur.
4. Ink and substrate are not firmly bonded. To solve this problem, we can try from two aspects. On the one hand, it is necessary to accurately select ink and control the quality of ink to adapt to the substrate. On the other hand, the surface of the substrate should be treated to improve its affinity to ink. It is best to deal with one side, put an end to the phenomenon of double-sided tension, which is due to the double-sided electrical treatment of the ink surface affinity is too good and produce anti stick.
Understanding the causes of the adhesion phenomenon of liquid packaging film is helpful to remind workers of the details that should be paid attention to in the production of liquid packaging film, so as to avoid such problems as far as possible, and improve the quality of liquid packaging film
Dongguan Beite packaging materials Co., Ltd. is a large-scale company specializing in the production of food grade composite packaging. It is a professional manufacturer of composite packaging bags. It uses new equipment to produce packaging bags and roll films, providing comprehensive, environmental protection and safety packaging services for the market. 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. We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.