Degradable BOPP packing film and manufacturing method thereof

Abstract

The invention discloses a degradable BOPP packing film and a manufacturing method thereof; the packing film is formed by co-extrusion of three layers of materials, namely surface-layer materials, core-layer materials and inner-layer materials, wherein the surface-layer materials and the inner-layer materials are formed by blending the following components by weight percent: 90-93 percent of random copolymer polypropylene modified raw materials, 4-7 percent of smoothing agents and 2-4 percent of antisticking agents; and the core layer is formed by copolymerization of the following components by weight percentage: 90-93 percent of homopolymer polypropylenes, 4-7 percent of binary polyketone polymers and 2-4 percent of anti-static agents. The manufacturing method thereof comprises the preparation of random copolymer polypropylene modified raw materials, the preparation of surface-layer materials and inner-layer materials, the preparation of core-layer materials, chilling and dual-axis two-way stretching, thus obtaining the degradable BOPP packing film. The packing film can meet the performance requirements of small commodity packages such as cigarettes, food, beverages, stationery and the like, and can simultaneously complete the degradation in a shorter time, thereby realizing the harmless automatic treatment of two-way stretching polypropylene films and the protection of environment.

Description

technical field [0001] The invention relates to a manufacturing method of a packaging film, in particular to a degradable BOPP packaging film and a manufacturing method thereof. Background technique [0002] At present, the annual consumption of various ordinary plastic BOPP films in my country is about 1.30-1.35 million tons. Mainly all kinds of ordinary BOPP films, such as BOPP printing film, paper-plastic composite film, adhesive tape film, etc. Among them, the highly transparent, heat-sealable, and heat-shrinkable BOPP films used for packaging of small commodities such as food, cigarettes, beverages, and stationery account for about 135,000 to 140,000 tons. [0003] Various high-transparency, high-gloss, heat-sealable, and heat-shrinkable BOPP films have played an important role in the beautification and protection of various cigarettes, food, beverages, stationery and other small commodities, especially cigarette packaging films. High standard. BOPP heat-shrinkable f...

AI Technical Summary

Problems solved by technology

However, packaging films such as cigarettes cannot be effectively degraded. Due to the existing BOPP heat shrinkable film, after opening the package, it becomes a discarded waste film, and these discarded waste films are ordinary polypropylene plastic films, which are not degradable and not recycled. value, and it is inconvenient to recycle, it can only be directly turned into garbage

These ordinary polypropylene plastic waste films cannot be decomposed within decades after being buried deep in the garbage. If they are collected and burned together with the garbage, they will also cause environmental pollution. Therefore, these non-degradable waste films have become the biggest hazards to the social environment. one of the factors

[0004] At present, although some modified blown packaging films (IPE / IPP) added with photosensitizer and starch can be photodegraded or biodegraded, the photosensitizer is toxic, and the starch plastic cannot be completely degraded, so it is only used for agricultural film, garbage bags, etc. , there is still the problem of environmental pollution

At the same time, the degradable packaging film cannot meet the performance requirements of small commodity packaging such as cigarettes, food, beverages, and stationery in terms of mechanical, optical, hygienic, and physical properties, especially the requirements of high transparency and high gloss.

At present, natural biodegradable materials such as PLA and PBS are expensive and cannot be used in high-magnification double-drawing, high-speed, and wide-width production lines. At the same time, they cannot meet the requirements of low specific gravity, low cost, and high physical properties, so they are not suitable for packaging for the above-mentioned small commodities. Therefore, it is urgent to provide an environmentally friendly packaging film that can be applied to the packaging of the above-mentioned small commodities.

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