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    15
    
    
    2023
    
    
    
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    06
    

    

    
    
    
    
    
    Pre-coating film relative to the more prominent advantages

    
    
    
    Author:

    
    
    
    

    

    

    

    
    
    If the pre-coating film is used for coating, it can effectively prevent bubbles or demoulding of the coated product.
    That is, the common point of foaming and stripping of film products processed by gluing wet composite process is that the film is separated from the matrix of paper printed matter, which destroys the tightness and smoothness of paper/plastic composite.
    Just different forms of expression. Blistering is the emergence of needle tips, rice grains, stripes, cracks and other shapes of local void. Delamination is a large area or the whole paper, plastic separation.
    Careful analysis of various manifestations of the accident cases, "film length", "glue hair sticky" is a basic law. The reason for the change of "film length" and "adhesive hair" is that there is a large amount of organic solvent in the adhesive used in the wet composite process.
    These organic solvents cannot be fully utilized in the production process, and remain in the adhesive layer, which is compounded by film and paper prints.
    The organic solvent remaining in the adhesive layer is constantly moving in the paper/plastic composite. The movement of organic solvent molecules is carried out simultaneously in different directions in order to escape from the glue layer matrix and volatilize to the atmosphere.
    One part moves in the middle of the adhesive layer to soften the adhesive and make the adhesive sticky. The other part is interspersed with the adhesive layer and moves to the paper to form diffusion in the ink printing layer and destroy the adhesion and penetration of ink to the paper;
    There is also a part of the film through the glue layer, to the film movement, blocked after gathering on the inner surface of the film, the film to produce swelling, so that it becomes longer, local convex bubble.
    The softening of the glue reduces the thermosetting adhesive force of the polymer material; the diffusion and dispersion of the ink causes damage to the paper adhesion; the swelling of the film becomes longer, and it must stretch to the outside and separate from the paper print matrix.
    The use of glue wet composite process, or early or late, or light or heavy, will inevitably appear blistering or stripping.
    There is no solvent in the hot melt adhesive used for pre-coating. There is no effect of organic solvent on the softening of glue, the diffusion of ink, the swelling of film, etc. The thermoplastic adhesive force of the polymer material is generated after it is separated from the heat source, and it is firm and durable. Therefore, it can effectively prevent the occurrence of quality accidents such as foaming and stripping of film coated products.
    

    
   
    

    
    
    
    

    

    
    
    

        

                    
    

        
    
    
    
    
    
    


    
    
    
    
    
    
    
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