The outer packaging of goods has become a problem that many manufacturers pay attention to. With the increasing demand of people, the film coating technology is widely used in the outer packaging, which makes the products colorful and dazzling, which greatly arouses consumers' desire to buy. However, due to factors such as materials, process technology, equipment, environment, etc., the laminating process will cause blistering, wrinkling, de-inking, peeling and peeling of the laminating film. Let's talk about how to avoid the development of these phenomena for specific situations.
After the occurrence of this phenomenon, it immediately attracted the attention of the factory's quality management personnel. After specific analysis by the technicians, the reasons are roughly as follows:
The printed material itself
As a printed matter, the nature of paper, the performance of the ink, and the density of printed graphics and text, etc., all affect the quality of the film. If you use poorly formed paper to print, due to the inconsistency in the size of the ink absorption and the absorption speed in the format, it will cause the quantitative change of the paper tightness, evenness, smoothness, and moisture. If the ink printing layer is too thick or thick, the wetting, spreading, and penetrating ability of the adhesive molecules will be poor, the movement of the molecules between each other will be relatively less active, and the mechanical bonding force will be small. In addition, in the printing process, in order to prevent the printed matter from sticking, kerosene is often added to the ink to quickly condense the ink layer, causing the surface of the ink layer to crystallize, and the surface of the printed matter is smooth and tough. Wetting affinity seriously affects the bonding fastness.
Process operation impact
When laminating the product, first coat a layer of adhesive on the surface of the plastic film. After drying, it still fails to meet the requirements of the laminating film. In this case, increase the concentration of the solvent to dilute the adhesive for quick drying, but the moisture content is too high, and air bubbles are likely to appear when the film is pressurized, which will then peel and fall off. At the same time, the film easily absorbs grease, moisture, dust and other substances in the air, thereby reducing its surface function. Excessive humidity will also affect the volatilization of the solvent in the adhesive. Too much residual solvent will cause air isolation in the film and make the film not stick up. At the same time, uneven roller pressure, uneven rubber roller, and dirt on the rubber roller will cause wrinkles when laminating.
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