High-speed strippable aluminum paper transfer release coating

Abstract

The invention provides a high-speed strippable aluminum paper transfer release coating. The high-speed strippable aluminum paper transfer release coating is composed of, by weight percentage, 15-25% of poly-n-butyl methacrylate, 5-14% of cellulose acetate butyrate, 0.5-1% of polyether modified polysiloxane, 23-25% of butanone, 20-23% of ethyl acetate and other solvent as balance. The high-speed strippable aluminum paper transfer release coating is prepared by stirring and dispersing the poly-n-butyl methacrylate, the cellulose acetate butyrate, and half of the butanone as well as the ethyl acetate inside a high-speed dispersing machine at a rotating speed of 500-1000 rpm / second for 30 minutes, controlling the temperature to be 40-50 DEG C, then continuing to mix in the rest of the butanoneand the ethyl acetate, the other solvent and the polyether modified polysiloxane for 30 minutes, cooling the mixture down to 20-30 DEG C, and performing filtering to obtain the high-speed strippablealuminum paper transfer release coating. The high-speed strippable aluminum paper transfer release coating is applied to transferring aluminum paper and released and sliced on a high-speed online stripping machine to avoid flying aluminum scraps and ensure intactness and cleanliness, avoids drops and is high in 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...

AI Technical Summary

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

Images