How to solve the problem that the film product is not bonded?
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In order to improve the surface gloss effect and mechanical resistance of printed products, the film is a frequently used surface treatment method for printed products, which is suitable for the packaging of various products, and can achieve the role of protecting and beautifying the goods and increasing the added value of the products.
In the film coating process, the most prone to quality problems is that the film of the film-covered product does not adhere well to the printed product and is easily detached. This will directly affect the use effect and the service life of the film-covered product. In order to solve this problem, it is necessary to comprehensively consider printing ink, printing process, and lamination process.
Printing ink
The lamination process is relatively simple, and the adhesive is used to bond the printed product to the film. The porous structure on the surface of the non-image area of the printed product is conducive to the penetration and diffusion of the adhesive. Therefore, the ink in the graphic area of the printed matter is the main reason that affects the binding of the printed product and the film.
The effect of the ink on the coating effect is mainly the effect of the surface properties of the ink after drying on the adhesive. When the ink is dry, the main component of the surface layer is the ink diluting agent, and also contains some other substances, for example, the silty particles in the white ink component will float on the surface layer of the ink due to insufficient binding force with the linking material, and then be dried; The aluminum hydroxide in the oil component is too light due to its light weight, and it also floats on the surface of the ink; the film-forming resin of the bright paste component can improve the film forming effect of the ink and is also on the surface of the ink.
When the film is covered, the white ink pigment particles on the surface of the ink will hinder the adhesive and affect the further penetration of the adhesive on the surface of the ink layer; the aluminum hydroxide in Willy oil is easy to form a barrier layer and hinder the adhesion of the adhesive. The interaction between the agent and the ink layer results in blistering or false bonding; the bright paste has an advantageous effect on the film coating, and the composition and the adhesive (the main component is a conjugated multi-bond terpene resin) have similar properties and affinity effects. it is good. Therefore, when adding an ink diluting agent, it is necessary to comprehensively consider the film coating effect of the product.
In addition, the particle size of the ink will also affect the coating effect. If the particle size is too large, it will affect the bonding effect between the film and the surface of the printed product, and it is likely to cause blistering and thus the adhesion is not true. In particular, gold and silver inks, because the metal pigment particles will be separated out after the ink is dried, hindering the mutual combination of the ink layer and the adhesive, the products printed using gold and silver ink are not suitable for film coating.
printing art
Pre-laminated prints need to be printed. As mentioned above, the surface properties of the dried ink will affect the film coating effect. However, under the premise of using suitable ink, the printing web, ink layer thickness, drying effect and the like will also cause the film adhesion to be impractical.