Gluing-free transfer printing film used for EVA surface printing

Abstract

The invention relates to the field of EVA surface printing, in particular to a gluing-free transfer printing film used for EVA surface printing. The transfer printing film comprises, in sequence frombottom to top, a transfer printing underlayer, an underpainting layer, a humidity-sensitive layer and a shape memory face layer. A preparation of the gluing-free transfer printing film comprises the following steps that: a supporting body is prepared, and the transfer printing underlayer is sprayed on the supporting body; the underpainting layer with colors is sprayed, the humidity-sensitive layeris sprayed, and leveling, drying and solidification are conducted; and the shape memory face layer is sprayed on the humidity-sensitive layer, and leveling, drying and solidification are conducted. The provided gluing-free transfer printing film used for EVA surface printing has the following beneficial effects: the shape memory layer adopts shape memory materials, so when the layer is partiallybent and heated, the shape is changed and solidified and the layer is not prone to creases or cracks; when the shape memory face layer is heated, the moisture-penetrability is higher, water is combined with the humidity-sensitive layer through the shape memory face layer, and a pattern changes from colorless to colorful, so rich changes of patterns are realized; and the firmness of the pattern onthe gluing-free transfer printing film is good.

Description

technical field [0001] The invention relates to the field of EVA surface printing, in particular to a glue-free transfer film used for EVA surface printing. Background technique [0002] In the field of chemistry and organic chemical industry, EVA refers to "ethylene-vinyl acetate copolymer" and its rubber and plastic foaming materials, molecular formula (C2H4)x.(C4H6O2)y, used to make refrigerator conduits, gas pipes, Civil engineering plates, containers and daily necessities, etc. It is solid at room temperature, and when heated and melted to a certain extent, it becomes a fluid with a certain viscosity. EVA rubber and plastic products are new environmentally friendly plastic foam materials, which have the advantages of good cushioning, shock resistance, heat insulation, moisture resistance, chemical corrosion resistance, anti-bacteria and waterproof, and are non-toxic and non-absorbent, so they are widely used in slippers, sandals, etc. production. Traditional EVA surf...

AI Technical Summary

Problems solved by technology

Traditional EVA surface printing mostly adopts thermal transfer printing to print the pattern on the substrate. Although the printed pattern can meet the requirements of the designer and is suitable for mass production, it has some defects: the pattern feels hard to the touch. , poor air permeability; horizontally pulling the heat transfer pattern is prone to small cracks, and when the pattern is bent with the substrate, the pattern at the bending part is prone to creases; heat transfer uses sublimation ink to print the picture on the transfer paper first, Then transfer to the surface of the medium, the finished picture is easier to scratch off, and the firmness is poor