Window lamination method for paper

Abstract

The invention discloses a window lamination method for paper. The window lamination method comprises the following steps: step 1, a two-sided corona film with one side pre-coated with hot melt glue isadopted, the other side of the two-sided corona film is bonded with the surface of the paper to be subjected to window lamination, full lamination of the two-sided corona film on the paper is realized, and an early semi-finished product is obtained; step 2, windowing is performed on the early semi-finished product, that is, a window is die-cut in a predetermined position of the early semi-finished product, scraps produced in die cutting are removed, and an intermediate semi-finished product is obtained; step 3, a heat seal film provided with co-polypropylene on at least one side is adopted, hot melt glue of the intermediate semi-finished product is covered with the side, provided with co-polypropylene, of the heat seal film, the heat seal film and the intermediate semi-finished product are bonded together through hot pressing by a hot pressing roller, and a finished paper product subjected to window lamination is obtained. The window lamination method has the advantages that the process difficulty is low, the effect of the window lamination finished product is good and the production efficiency is high.

Description

technical field [0001] The invention relates to a window-opening and film-coating method for paper. Background technique [0002] Window lamination is a special kind of paper lamination process. In addition to the advantages of film-coated products, it also makes the goods packaged in paper more visible. [0003] Existing paper window laminating method, the steps are: [0004] A. First open the window on the printed paper, that is, die-cut the window at the predetermined window position and remove the waste generated by die-cutting. [0005] B. Apply oil-based glue to the paper with the window opened by the coating roller. [0006] C. Heat and press the paper made in step B and the BOPP film through the upper and lower pressure rollers to complete the window lamination. [0007] In addition, before implementing the above-mentioned existing paper window-opening and film-covering method, the following preparatory work needs to be carried out: [0008] First, the thickness ...

AI Technical Summary

Problems solved by technology

If too much glue is applied, there will be glue overflowing on the edge of the window

And as long as the window is glued, there will be more or less glue on the window position of the product, which directly affects the hygiene, safety and appearance of the product.

[0016] Second, after the glue is applied, the paper needs to be dried before it can be coated, and the length of the drying time depends on the characteristics of the product, the amount of glue applied, and the temperature and humidity of the environment. It is difficult to control very big

[0017] Third, because gluing and laminating cannot be produced simultaneously in line, the problem of paper surface scratching is prone to occur during the process of transferring to laminating process after gluing

When the order quantity is large, the production is extremely difficult

[0018] Fourth, because the paper after die-cutting and opening is used for gluing, and the paper after opening the window will become uneven due to the opening of the window, making the effect of gluing uneven. Some parts of the entire paper surface have excessive glue, while some There is too little glue in the position, causing some products to open glue, and some products have glue overflow problems

[0020] First, due to food packaging requirements, water-based glue must be used for lamination, and the phenomenon of glue marks on silver cardboard with water-based glue cannot be solved

[0021] Second, in order to prevent sticking to the bottom during printing, the powder spraying will be more during printing, so as to use the powder spraying to play a drying effect, so that the surface roughness of the paper will become higher, which will affect the ductility of the adhesive (leveling and elongation) ), resulting in uneven glue application, which can lead to snow spots and bright spots or “fogging” on the surface of the final product due to poor film compaction

[0022] Third, due to thermal expansion and contraction, after the paper is heat-coated, after the paper cools and shrinks, the film at the window opening will wrinkle, and the edge of the window will appear blistering

[0023] Fourth, the window position is prone to glue overflow, which affects the appearance and quality of the product

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