PVC heat shrinkable film can be divided into soft PVC and hard PVC. Among them, hard PVC accounts for about 2 / 3 of the market and soft PVC accounts for 1 / 3. Soft PVC is generally used for floor, ceiling and leather surface. However, because soft PVC contains softener (which is also the difference between soft PVC and hard PVC), it is easy to become brittle and difficult to preserve, so its application scope is limited. Hard PVC does not contain softener, so it has good flexibility, easy to form, not easy to crisp, non-toxic, pollution-free and long storage time. Therefore, it has great development and application value. Hereinafter referred to as PVC. The essence of PVC is a kind of vacuum blister film, which is used for the surface packaging of various panels, so it is also called decorative film and adhesive film. It is used in many industries such as building materials, packaging, medicine and so on. Among them, the proportion of building materials industry is * *, accounting for 60%, followed by packaging industry, and several other industries with small-scale application.
Common shrink films in daily life include POF, PE and PVC; Among them, its functions are non-toxic, environmental protection, high transparency, large shrinkage, good sealing performance, high gloss, toughness, tearing, uniform heat shrinkage, etc; Chaohong plastic packaging is a professional manufacturer specializing in the production of various shrink films, providing our customers with high-quality products. POF heat shrinkable film general multilayer coextrusion polyolefin heat shrinkable film. It is linear low density polyethylene (LLDPE) as the intermediate layer, CO polypropylene (PP) as the internal and external, through three extrusion plastic extruders, and mold molding, membrane bubble inflation and other special treatments. It is mainly used for product packaging of regular and irregular shapes. Due to its non-toxic, environmental protection, high transparency, large shrinkage, good sealing performance, high gloss, toughness, tearing and uniform heat shrinkage, it is suitable for high-speed automatic packaging. It is a substitute for traditional PVC heat shrinkable film. It is widely used in automotive products, plastic products, stationery and books. PVC heat shrinkable film can be used for insulating packaging of electrical and electronic components (such as the outer packaging of dry batteries); Packaging of general articles and packaging in contact with food, etc. Using it as packaging material can not only simplify the packaging process and reduce the packaging volume, but also because the contracted transparent film tightly wraps the packaged articles, it can clearly show the color and shape of the articles. Therefore, PVC heat shrinkable film is widely used in commodity packaging.
Heat shrinkable film began to enter China's market, and relevant production equipment was also introduced into China in the same period. At present, several domestic plastic machinery manufacturers can manufacture double bubble heat shrinkable film production equipment. For domestic heat shrinkable film manufacturers, most of their equipment are purchased, and some production equipment of * * heat shrinkable film products (such as POF, PVDC, etc.) need to be imported. However, after years of introduction, digestion and absorption, individual domestic heat shrinkable film manufacturers can also manufacture high-performance POF heat shrinkable film production equipment by themselves.
Heat shrinkable films are divided into cross-linked heat shrinkable films and non cross-linked heat shrinkable films. Crosslinked heat shrinkable film is a high value-added product. The network structure brought by ionizing radiation treatment increases the toughness of the film, which is not prone to quality problems such as delamination, unsealing, insufficient shrinkage and surface damage as ordinary heat shrinkable film. However, due to the complex process of cross-linked heat shrinkable film and large equipment investment, only a few countries in the world, including the United States, China and Japan, can produce this product.
