Understand the simple vacuum coating process
Release time: 2020 / 07 / 16 16:11:24 reading volume: 1464 times
A brief understanding of the vacuum bag coating process.
The composite methods of food vacuum bag packaging materials mainly include dry composite method, wet composite method, extrusion composite method, coating composite method and solvent-free composite method.
Next, we will describe the vacuum bag coating method. The coating method uses the coating as the layer structure of the composite material, and the coating method is used as the adhesive. Because the thickness of the coating is thinner than that of the film used for similar functions, the coating method is more economical than lamination. The commonly used vacuum bag coating methods of composite soft vacuum bag packaging materials are as follows:
1. Wax coating of waterproof vacuum bag.
Wax is a kind of coating material with long time and wide application. At present, it has been replaced by polyolefin in some occasions. When greater softness and stronger sealing strength are needed, the mixture of wax and polyethylene is generally used as coating layer. For example, the waterproof coating on the outside of paper cup containing cold drinks and hot drinks is the mixture coating of wax and polyethylene.
2. Varnish coating for protection of printing layer.
There are mainly two kinds of varnish, one is volatile varnish containing solvent, the other is printing varnish, the latter has no solvent, it is dried by oxidation curing rather than solvent volatilization. The varnish is often used in both varnish coating processes to protect the surface from contamination.
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