0010010 nbsp; 0010010 nbsp; 0010010 nbsp; Laminating adhesives have two types of composite processes: dry laminating adhesives and wet laminating adhesives. Solvent-free hot-melt adhesives are pre-coated. The compound process is as follows:
First, pre-coat the hot-melt adhesive, and then level the pre-coating of the hot-melt adhesive. At this time, the printed matter is transported, and the film is hot-pressed, and the product is cut after the pressing.
The emulsion-type adhesive compound wet-coating process is as follows: First adjust the BOPP film to achieve tension balance, mix with the emulsion-type adhesive and thinner, and apply the obtained adhesive on the BOPP film. At the time of conveying the printed matter, the film is hot-pressed, and the product is cut after curing.
2, equipment for two composite processes
Solvent-free hot-melt adhesive pre-coating film dry lamination is a hot-pressing process, as long as the laminating (composite) machinery with hot-press structure can be used. Emulsion-type adhesives, namely wet-coating with glue, belong to the process of volatile curing of ready-coating. Need to use the instant coating and water coating machine.
3, description of two compound processes
Solvent-free hot melt adhesive pre-coating film dry composite process. The compound production process has been simplified to a single hot press. As long as the operator gives reasonable heat. In order to achieve a better fusion of hot melt adhesive and to the composite carrier. The ink printing layer is divided into diffusion dislocations, and the compounding can be completed. Milk-filled adhesive is a wet compounding process with glue. It is to replace the solvent-based adhesives with serious pollution in the wet-coating process of instant glue with emulsion adhesives. Because the volatilization effect of organic solvent in the production process of instant rubber coating cannot be achieved, and the solvent content is low. Therefore, the drying part of the wet-coating wet composite mechanical equipment is simply omitted, and the solvent is directly absorbed by the substrate and then slowly volatilized. Become a better "wet" and "cold" lamination process. This makes the core technology of the emulsion-type cavity adhesive, namely the glue-wetting wet composite process, manifested as the control of coating, cold pressing and drying.
0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 0010010 nbsp; 4, the development of two composite processes
The dry film coating process uses environmentally friendly BOPP film as a composite material, which has high film quality, simple equipment structure, convenient operation, high production efficiency, and waste composite products can be processed in 60 oC pulping water. The advantages of sorting and recycling such as plastic separation and disintegration have been adapted to the requirements of 21 century for better post-press processing, greenness, and sterility, and comply with IS 014000 series of environmental management standards.
In addition to the prevention and improvement of the adhesion phenomenon of the wet film coating process, the main thing is to continue to improve the emulsion adhesive to make it better to achieve fast drying speed, strong adhesion and high toughness. Strong adhesion, good weather resistance and recyclability.
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