A release coating suitable for high-speed peeling transfer aluminum-coated paper

Abstract

The invention provides a kind of release coating that is suitable for the transfer aluminized paper of high-speed stripping, and this release coating is to be to comprise the polybutyl methacrylate of 15-25%, the acetic acid butyric acid of 5-14% by weight percentage Cellulose, 0.5%-1% polyether-modified silicone, 23-25% methyl ethyl ketone, 20-23% ethyl acetate and the rest of other solvents are firstly mixed with polybutyl methacrylate and acetic acid butyric acid Put half of the cellulose, butanone and ethyl acetate into the high-speed disperser, stir and disperse at a speed of 500-1000rpm / sec for 30 minutes, control the temperature between 40-50°C, and then add the remaining butanone and ethyl acetate Esters, other solvents, and polyether-modified silicone, continue to mix and stir for 30 minutes, let the materials cool naturally to between 20-30°C, and filter to obtain. The release coating of the present invention is applied to transfer aluminum-plated paper, and it is peeled and cut on a high-speed in-line peeling machine with a machine speed of 200-280m / min, so that no flying aluminum will occur, the coating is complete and clean, and there is no drop point. , and the coating has good solvent resistance.

Description

technical field [0001] The invention relates to a release coating, in particular to a release coating for transferring aluminized paper, more particularly to a release coating for transfer aluminized paper suitable for high-speed peeling. Background technique [0002] The early gold and silver cardboard used in the packaging boxes of tobacco, wine, food, daily necessities, etc. was mainly produced by the composite method, that is, the aluminum foil or aluminized film is directly composited with the paper. Since the aluminum foil and plastic film in the product cannot be degraded or recycled, Cause environmental pollution and a lot of waste of resources. In order to protect the environment and save resources, the production of gold and silver cardboard began to adopt the direct plating process and the transfer process. [0003] The direct plating method is to vapor-deposit the paper directly with the aluminum plating machine, but the problems it encounters are: (1) The moist...

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Problems solved by technology

[0003] The direct plating method is to vapor-deposit the paper directly with the aluminum plating machine, but the problems it encounters are: (1) The moisture content of the paper changes greatly when the aluminum plating is exhausted. Moisture has a great influence, which will affect the performance of paper fibers to a certain extent, so that there will be more problems in the subsequent processing; (2) because the thickness of the aluminum plating layer is usually only about 30nm, if the surface of the paper is not pre-coated Cloth treatment, it is impossible to make the aluminized layer uniform and smooth, and the aluminized effect will be very poor, and even the follow-up process can hardly be carried out.

The release coating plays a key role in the transfer process. At present, the release coatings suitable for heat transfer printing on the market mainly include wax type and resin type. Wax release coating is the most widely used type release coating. However, because part of the wax in the wax release coating will melt and penetrate into the ink when the transfer temperature is high, thereby affecting the color of the product; most resin release coatings have poor layability, and the release layer is relatively brittle after film formation. In high-speed in-line peeling, it will cause defects such as film breakage and unclean peeling, and the existing resin-type release coatings are not resistant to solvents and have poor adhesion to PET surfaces.

[0005] With the continuous improvement of the process requirements of my country's cigarette pack printing technology, foreign high-speed in-line stripping machines (with a machine speed of 200-280m / min) have gradually replaced domestic ordinary stripping machines (with a machine speed of 100-180m / min). The use of equipment puts forward higher requirements for the release coating. In addition to the rapid peeling of the carrier film under heat and pressure, it is also required that the peeling and cutting cannot be "flying aluminum" during high-speed operation, and the transfer coating must be complete. Clean, no drop, better film-forming properties, and the final printing requires a higher solvent resistance than ordinary release coatings. The existing release coatings obviously cannot meet this requirement

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