Paper-plastic compounding-transfer process using single-component solvent-free glue

Abstract

The invention provides a paper-plastic compounding-transfer process using single-component solvent-free glue. The process comprises compounding of a transfer film and a paper, and peeling of a transfer base film. The glue of the compounding of the transfer film and the paper is single-component solvent-free polyurethane glue with an average relative molecular weight of 1000-6000, the free NCO<-> content of the glue is 2-10%, and a viscosity of the glue at 55-85 DEG C is 200-800 MPa.s. An apparatus for the compounding of the transfer film and the paper comprises a coating unit, a humidifying unit, a compounding unit, a cooling unit and a winding unit, wherein the coating unit is a five-roll glue delivery coating structure composed of a glue storage steel roll, a metering steel roll, a gluetransfer roll, a coating steel roll and a coating pressure roll. The compounding of the transfer film and the paper is performed and then a curing process is performed and then peeling of the transferbase film is performed. According to the compounding-transfer process, a cigarette packet transfer cardboard with good folding resistance, strong adhesion and anti-humidity change performance is obtained by controlling the NCO<-> content, the viscosity and the relative average molecular weight of the glue, and controlling coating uniformity and a coating layer thickness.

Description

technical field [0001] The invention relates to a paper-plastic composite-transfer process, in particular to a paper-plastic composite-transfer process applied to the production of cigarette pack transfer cardboard, and more particularly to a paper-plastic composite-transfer process applied to the production of cigarette pack transfer cardboard and using a single-component non-toxic Paper-plastic composite-transfer process of solvent glue. Background technique [0002] Cigarette packaging boxes are mainly used to protect cigarettes and facilitate storage and transportation of cigarettes. At present, the paper used to make cigarette packaging boxes is mainly hard-wrapped white cardboard and soft-wrapped coated paper. These papers are all high-grade wrapping papers. In order to increase the decoration and anti-counterfeiting properties of cigarette packaging boxes, transfer cardboard (cigarette pack transfer cardboard) obtained by laminating white cardboard or coated paper wi...

AI Technical Summary

Problems solved by technology

At present, cigarette pack transfer cardboard is produced by wet lamination process: that is, after coating the self-crosslinking type modified acrylate polymer emulsion on the transfer film surface (aluminum layer or zinc sulfide layer) of the transfer film, it is combined with paper Pressing, entering the oven for thermal curing, and then peeling off the base film to achieve the purpose of compound-transfer, this process has the advantages of convenient coating construction, good leveling, no organic solvent volatilization, etc., but the product has the advantages of compound firmness and Performance defects such as poor folding resistance (especially poor wet strength) have not been overcome; in addition, the composite process is to glue the transfer film surface of the transfer film through a three-roller glue transfer method. The three-roller glue transfer structure is mainly composed of anilox It is composed of steel roller, glue roller, and coating roller. The transfer method is mainly that the anilox steel roller transfers the glue from the glue tank to the glue roller, and then applies pressure to the glue through the coating roller. On the surface of the substrate, this three-roller glue transfer method cannot coat high-viscosity solvent-free glue, and the uniformity is very poor, and the amount of glue is controlled by pressure, so the accuracy is even worse

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