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At present, the common heat shrinkable film on the market has PE shrink film, PVC shrink film, PP shrink film, POF co-extruded shrink film, etc. In the family of heat shrinkable packaging film, POF three-layer co-extruded heat shrink film is a kind of A new generation of products that are gradually emerging and accepted by people.
POF-C3 heat-shrinkable packaging film is a kind of multi-layer environment-friendly non-toxic heat-shrinkable packaging material produced by co-extrusion blow molding process with PE and PP as main raw materials. Originated in Italy in the early 1990s, the main features of the product are:
1. High transparency and high gloss, which can clearly display the appearance of the product, improve the exhibition effect, and reflect a higher grade of goods.
2, good flexibility, easy to use. Because this flexibility allows the packaged item to be cushioned when subjected to external impact, the package used for the crisp container also prevents the container from breaking up and scattering.
3, high shrinkage. The highest shrinkage rate is up to 75%. The shrinking flap force generated by its high shrinkage rate can tightly pack a group of items to be packaged. It plays a very good role in binding, and is very suitable for the assembly and packaging of multiple items, especially for profiled products. The packaging of the item is very good. Moreover, the shrinkage force of the POF-C3 film processed through a special process is controllable to meet the requirements of different goods on the contraction force.
4, good welding performance, high strength, suitable for manual, semi-automatic and high-speed automatic packaging.
5, good cold resistance, can maintain flexibility at -50 degrees Celsius without the occurrence of embrittlement, suitable for packaging in cold storage and transportation.
6, non-toxic environmental protection. The main raw materials of POF-C3 heat-shrinkable packaging film include LLDPE, TPP, PPC and necessary functional auxiliaries such as slip agent, anti-blocking agent and anti-static agent, which are non-toxic materials. Conforms to American PDA standard, can pack food.
7, moisture and dust.
8, low packaging costs, better than carton and other material packaging.
In recent years, China has gradually introduced equipment and raw materials to produce PDF-C3 heat-shrinkable films. Currently, more than 10 production lines have been put into operation, showing a good momentum of development. At present, the company with the largest production scale in the country is Baoding Baoyuan New Plastic Packaging Material Co., Ltd., which belongs to Hebei Dingshuo Group. It is a Sino-foreign joint venture that specializes in the production of POF-C3 heat-shrinkable packaging film. The annual designed production capacity is 12,000 tons. , The product scale is complete, its equipment and technology are introduced abroad, with the international advanced level.
POF-C3 series of heat shrinkable packaging film is very versatile and fully compatible with today's environmental protection non-toxic world consumer trends. This material can not only reduce the user's packaging production costs, transport costs, reduce the packaging volume to save space, can greatly increase productivity, but also because it has more transparency, can improve product visibility, can be in a highly competitive, commodity A wide array of supermarkets quickly grabs the attention of consumers on the shelves; and caters to the consumer's convenience and economical psychological characteristics, bundles and packages goods, and is particularly suitable for packaging and deluxe goods in supermarkets. Has been widely valued and applied. The packaging applications in beverages, convenience foods, daily chemical products, audio and video products, books, medicines, electronic components and other product areas have become very popular. Basically, the generation of PVC heat shrinkable packaging films has become the mainstream product in heat shrinkable packaging materials.
At present, POF-C3 series heat-shrinkable packaging film is still in the preliminary stage of application in China, and its application scope is still narrow. It is limited to beverages, audio-visual products, convenience foods, and a small amount of daily chemical products. The annual demand is about 2.5-3 million tons. However, the application potential in the following areas is quite large.
1) Cultural and educational supplies - books, photo albums, pen holders, etc.
2) Crafts - plasters, vases, stonework, etc.;
3) Electrical appliances - dry batteries, batteries, meters, switches, electronic components, etc.;
4) Hardware - such as mechanical parts, small machinery, tools, etc.;
5) Communication equipment - such as telephones, fax machines, etc.;
6) Other products such as medicine, food, tobacco, alcohol, ceramics, paper, glass products, etc.
In addition to being used directly for packaging, POF heat shrinkable film can also be used for printing after corona treatment to meet the high demand packaging of goods. In addition, the new packaging area and scope continue to expand with the practice of market development and consumption.
At present, PVC heat shrinkable film also occupies a considerable heat shrink packaging market, opening up great potential. With China's accession to the WTO and its integration with the international market, the increasing demand for large quantities of exported goods and the rapid development of domestic supermarkets, the number of POF-C3 heat-shrinkable packaging films will rapidly increase. -C3 series heat shrinkable film market is very broad.
The heat shrinkable film is designed based on the principle of high-extraction molecular chain stretching and orientation, and is molded by quenching. The physical principle is that when the ionomer is in a highly elastic state, its orientation is stretched, and then the polymer is quenched to below the glass transition temperature, the molecular orientation is frozen, and when the article is heated during packaging Due to the relaxation of stress caused by molecular motion, the molecule returns to its original state and shrinks.