A time-stable high-gloss, low-haze, ultra-smooth bopp film

Abstract

The invention discloses an aging-stable, high-gloss, low-haze and ultra-smooth BOPP (Biaxially-oriented Polypropylene) film which is formed by coextru-lamination of a core layer, a surface layer and an inner layer, wherein the surface layer comprises the following ingredients in percentage by weight: 96%-99.8% of copolypropylene resin, 0.1%-3% of a smooth agent and 0.1%-1% of an antiblocking agent; the core layer comprises the following ingredients by weight percentage: 99.5%-99.7% of homopolypropylene resin and 0.3%-0.5% of an antistatic agent; and the inner layer comprises the following ingredients in percentage by weight: 97%-99.8% of copolypropylene resin, 0.1%-0.2% of the smooth agent and 0.1%-1% of the antiblocking agent. According to the film, the matching relationship between two assistants is optimized, the synergistic effect of the two assistants is made full use of, the contradiction between smoothness and anti-blocking due to the fact that excessive smooth agent is added to obtain an ultra-smooth effect in the existing product is overcome well, the friction coefficient of the film is reduced obviously, and the optical property of the film is ensured simultaneously.

Description

Technical field [0001] The invention relates to a packaging material, especially a packaging film. Background technique [0002] Slip performance is an important performance index of BOPP film. In the process of using BOPP film, there is a certain amount of friction with the equipment, which will make the surface of the film grind and lose its luster. More importantly, the packaging is becoming increasingly high-speed and automated. The large friction coefficient causes the film’s running resistance to increase, and it is also easy to Static electricity is generated due to friction, and the film adheres to the equipment, which seriously hinders high-line packaging speed. Good smoothness is conducive to the improvement of the adaptability of BOPP film to packaging equipment. The high-speed packaging process of downstream products also proposes the smoothness of the film. In response to higher and higher requirements, the importance of smooth film development has become increasing...

AI Technical Summary

Problems solved by technology

[0005] The Chinese invention patent with the publication number of 101269722 on September 24, 2008 discloses a super-smooth biaxially stretched polypropylene film for shrinkable cigarettes that is easy to unwrap and shrink. The coefficient of friction of the film, without considering the effect of additives on the optical properties of the film

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