Environment-friendly code-spraying BOPP (Biaxially Oriented Polypropylene) high-speed cigarette packing heat shrinkage film and preparation method thereof

Abstract

The invention provides an environment-friendly code-spraying BOPP (Biaxially Oriented Polypropylene) high-speed cigarette packing heat shrinkage film and a preparation method thereof. The BOPP thin film is characterized by being prepared by three layer structures including an upper surface layer, a core layer and a lower surface layer through direct co-extrusion and compounding, wherein the uppersurface layer is prepared from ingredients including 90 to 99 weight parts of copolymer polypropylene and 1 to 10 weight parts of printable anti-adhesion masterbatch; the core layer is prepared from the ingredients including 55 to 79 weight parts of homopolymer polypropylene, 20 to 35 weight parts of stiffening agent masterbatch and 1 to 10 weight parts of smoothening-anti-static agent masterbatch; the lower surface layer is prepared from the ingredients including 45 to 84 weight parts of copolymer polypropylene, 10 to 30 weight parts of non-migration smoothening-anti-adhesion masterbatch A, 5to 15 weight parts of non-migration smoothening agent masterbatch B and 1 to 10 weight parts of anti-adhesion masterbatch. The thin film maintains original good machine applicability, high stiffness,high elasticity modulus and excellent optical performance; the problem that an original thin film cannot durably maintain surface printing or code spraying is effectively solved.

Description

technical field [0001] The invention belongs to the field of film materials, and in particular relates to an environment-friendly heat-shrinkable film for BOPP high-speed cigarette packaging and a preparation method thereof. Background technique [0002] Some large tobacco companies use inkjet printing technology on the BOPP film of cigarette packaging to add digital codes to their products in order to identify and prevent counterfeiting of their own brands. The general BOPP packaging film for cigarettes on the market is a non-polar polymer with low surface tension. If ink is required to be attached to the film surface, corona treatment must be performed on the surface of the BOPP film. In the process of corona treatment, due to the high-voltage discharge of the equipment, the air is ionized, producing ozone, nitrogen monoxide, nitrogen dioxide and other nitrogen oxide compounds, among which nitrogen monoxide and nitrogen dioxide will form nitric acid with water dissolved in...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: on the basis of the original environmentally friendly BOPP high-speed cigarette packaging heat shrinkable film that can spray codes, the surface corona treatment is not carried out, and a new type of surface layer is used to add materials so that the additives on the lower surface of the film do not migrate to other parts. One surface layer is removed, so that it will not affect the adhesion of ink on the surface of the film, so that the film has a more durable and effective printing or coding function; and the film still maintains the original good machine applicability, good stiffness, high elastic modulus, Excellent optical performance, effectively solving the problem that ordinary cigarette packaging films cannot maintain surface printing or coding capabilities for a long time

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