Process for coating film on sheet material

Abstract

The invention discloses a process for coating liquid medicine on surfaces of patterns and letters on a sheet material to form a protecting film. The process comprises the following steps: a coating rubber roll is driven to rotate through a motor; a material guide roll is driven to rotate in the same direction through another motor; a liquid medicine roll is arranged behind the coating rubber roll, and is clung to and extruded with the coating rubber roll; liquid medicine enters the space between the liquid medicine roll and the coating rubber roll through an injection port; the liquid medicine roll is driven to rotate through a motor, so as to generate a medicine film with certain thickness on the surface of the coating rubber roll; simultaneously, the material to-be-coated is guided by the guide roll, and passes through the gap between the guide roll and the coating rubber roll; and the medicine film is coated on the material to-be-coated. According to the process, the film coated on the sheet material is level, the quantity of micro-pores is greatly reduced, and requirements for solidification can be met without further carrying out a flattening step.

Description

[0001] technical field [0002] The invention belongs to a method for coating a layer of film on the surface of a sheet, in particular to a method of coating a medicinal solution on the surface of a sheet pattern or text to form a protective film or coating the medicinal solution on The surface of the sheet is a process for forming an attached film for transfer printing. Background technique [0003] The traditional method of covering the sheet with a film is to use a motor to drive the material guide roller to drive the coating rubber roller to rotate in the opposite direction, and set the liquid medicine roller in front of the coating rubber roller, the liquid medicine roller and the coating glue. The rollers are pressed against each other, and the liquid medicine enters between the liquid medicine roller and the coating rubber roller from the injection port, and the liquid medicine roller is driven by the rotation of the coating rubber roller, and a certain thickness of t...

AI Technical Summary

Problems solved by technology

Due to the mechanical structure itself, there is a large error in the adjustment of this gap size, especially for thin coatings, it is difficult to control

[0005] What is more serious, there are micropores and unevenness on the film produced by the traditional process, and there are steps to eliminate the unevenness and micropores of the membrane in the subsequent procedure. The existing steps include using gravity to flatten, and some using wind pressure Flattening, and eliminating micropores by infrared radiation, etc., all steps require the coating material to be spread flat on the equipment, which not only takes up a large space, but also prolongs the forming time

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