Paper-plastic packaging is also a kind of composite film packaging, which is generally composed of paper prints (kraft paper, coated paper, etc.) and two to three layers of plastic film. Specific commonly used are divided into paper-plastic composite film and paper-plastic aluminum composite film .
With the improvement of living standards, people's awareness of environmental protection is also being strengthened. Kraft paper gives a warm and nostalgic feeling with a simple appearance. Its natural brown color adds a charm to the packaging and is popular among consumers. After a few years ago and remediation of excessive packaging, along with environmental awareness, driven by cutting-edge fashion, style is quietly packaging changes, the brand at the forefront of the guide, paper and plastic packaging industry is becoming a very large hot spot.
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One. Material structure of paper-plastic packaging
 Paper-plastic packaging film is to use film adhesive to compound the film and paper printed matter together.
The surface types involved in paper-plastic composites are very complex.In terms of their composite materials, the plastic layers include biaxially stretched polypropylene (BOPP), polyethylene (PE), nylon (ny lon), polyester (PET), poly Vinyl chloride (PVC), etc .; paper layer is pure paper, coated paper (coated paper and colored paper); ink layer can be divided into water-based ink layer and oil-based ink layer.
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two. Application of paper-plastic packaging
Paper-plastic composite films are generally used in various foods such as candy, biscuits, melon seeds, etc. Paper-plastic aluminum packaging is widely used in the processing of liquid dairy products, vegetable protein beverages, fruit juice beverages, alcoholic products and drinking water. Sterile packaging materials can Packaging includes milk, juice and beverages, alcohol, water, tomato products, soups, sweets, nutritious food and other products.
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two. Advantages of paper-plastic packaging
Paper-plastic packaging gives the surface of the printed product bright color (rich in three-dimensional sense), bright and smooth, moisture-proof, anti-fouling, anti-color drop, improved tear strength, anti-extrusion and a certain degree of fresh-keeping function. Paper and plastic products having a large load bearing, not easily damaged, long life, anti-acid, anti-aging, not hygroscopic, mycophenolate borers, easy deformation characteristics, it is widely used in covers of books, wine, shoebox , The production of decorative boxes, gifts, toys and other product packaging boxes.
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3. Processing / production process of paper-plastic packaging
At present, the paper-plastic composite process mainly includes dry composite and water-based cold lamination composite.
Dry compounding is to apply emulsion acrylate adhesive on the plastic film, dry the water, and the adhesive layer is viscous under the action of the hot press roller, so as to achieve the purpose of bonding the compound surface, this method has compound adaptation The advantages of strong performance, high bonding strength , fast production efficiency and low cost have become the mainstream composite technology .
Water-based adhesive lamination refers to the application of water-based adhesive emulsion on a polymer film , which is directly laminated with paper under a small pressure and adopts a natural curing process.
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