A kind of single polyethylene composite packaging material and preparation method thereof

Abstract

The invention discloses a composite packaging material with single polyethylene. The composite packaging material comprises a heat-seal layer and a surface printing layer which are subjected to composition to form the composite packaging material. The heat-seal layer comprises metallocene PE (polyethylene) and low-density polyethylene (LDPE), the surface printing layer comprises linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE), and the heat-seal layer and the surface printing layer are subjected to composition by the aid of solvent-free composition processes. A method for preparing the composite packaging material includes (1), preparing the heat-seal layer; (2), preparing the surface printing layer; (3), carrying out gravure internal printing on the surface printing layer and then carrying out composition on the surface printing layer and the heat-seal layer by the aid of the solvent-free composition processes. The composite packaging material and the method have the advantages that the composite packaging material which is a product has exquisite printed patterns and is bright, beautiful and soft in appearance, the composite strength of the composite packaging material is 3-5 N / 15 mm, the heat-seal strength of the composite packaging material is 20-30 N / 15 mm, the breakage rate of the composite packaging material is lower than 0.1%, the composite packaging material is good in drop resistance and high in mechanics index, the waste packaging recovery rate can reach 95% at least, and accordingly environmental pollution due to white garbage can be reduced; the composite packaging material can be used for packaging expanded, bread foot and daily chemical products and the like.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a single polyethylene composite packaging material and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, the demand for plastic flexible packaging is also increasing. The application of a large number of plastic flexible packaging has also produced a large amount of plastic waste while facilitating people's lives. The flexible packaging products currently on the market mainly use composite materials of different combinations such as biaxially oriented polypropylene, biaxially oriented polyester, biaxially oriented polyamide, polyethylene, and cast polypropylene. Due to the large difference in melting point and crystallization temperature of this composite material, it is difficult to separate and recycle after being discarded, and only the overall recycling method can be adopted, which leads to a...

AI Technical Summary

Problems solved by technology

Due to the large difference in melting point and crystallization temperature of this composite material, it is difficult to separate and recycle after being discarded, and only the overall recycling method can be adopted, which leads to a great limitation in the scope of reuse, and the repeated application value of the material cannot be maximized. good play

According to the research report of my country Plastic Packaging Association, the consumption of plastic packaging materials in my country in 2016 is about 20 million tons, of which less than 5% can be recycled and reused, causing a lot of waste