A kind of PU film direct gluing method

Abstract

The invention discloses a direct gluing method for a PU film. The method comprises the steps that a PET film is attached to the one face of the PU film by oppositely pressing rubber rollers, a conveyer belt conveys the PU film coated with the PET film to a gluing rubber roller for gluing the other face of the PU film, and then the conveyer belt conveys the glued PU film to a drying oven for solidifying the glue; after the PU film with the solidified glue is output from the drying oven, a PET film wind-up roll peels off the PET film attached to the PU film, and a wind-up barrel rolls up the glued PU film. The direct gluing method for the PU film overcomes the defect that a PU film produced based on the existing technology is low in glueyness. Due to the fact that a layer of tensile protective film is arranged on the bottom face of the PU film in a compound mode during direct gluing, the PU film is directly glued and the problem that the PU film is scratched and is easily stretched during direct gluing is solved at the same time. Surface gluing uniformity and adhesiveness of the PU film are ensured.

Description

technical field [0001] The invention relates to film gluing, in particular to a method for directly gluing a PU film. By attaching a PET film to one side of the PU film and then directly gluing the other side of the PU film, the gluing performance of the PU film is improved. Background technique [0002] The surface energy of PU material at room temperature is low, and it will become longer under tension. After the temperature rises, it will become softer and will be close to the state of melt flow, so it cannot be coated. The PU film will be stretched and softened when heated. The surface energy of the PU film at room temperature is very low, and the adhesion with most adhesives is very low, so the traditional direct coating method cannot be used on the PU film. The PU gluing process realizes that the glue is coated on the release paper, and then it is combined with the PU film after drying in an oven, and the glue is transferred to the PU film. The disadvantage of this pro...

AI Technical Summary

Problems solved by technology

[0002] The surface energy of PU material at room temperature is low, and it will become longer under tension. After the temperature rises, it will be softer and will be close to the state of melt flow, so it cannot be coated

The PU film will be stretched and softened when heated. The surface energy of the PU film at room temperature is very low, and the adhesion with most adhesives is very low, so the traditional direct coating method cannot be used on the PU film. The PU gluing process realizes that the glue is coated on the release paper, and then it is combined with the PU film after drying in an oven, and the glue is transferred to the PU film. The disadvantage of this process is: because the surface energy of the PU material is very low, resulting in its It cannot be well compounded with glue, so that the adhesiveness is too low, and this process is complicated and the production efficiency is not high

Images