Development direction of the hottest polypropylene

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Development direction of special materials for polypropylene salivation film

polypropylene salivation film (CPP) is a non tensile, non oriented flat extruded film produced by melt salivation quenching. Compared with film blowing, it is characterized by fast production speed, high output, good film transparency, gloss and thickness uniformity. At the same time, because it is flat extruded film, the subsequent processes such as printing and compounding are very convenient, so it is widely used in the packaging of textiles, flowers, food and daily necessities. The production of salivary film in China started in the 1980s. With the continuous development and expansion in the past 20 years, it has become a sunrise industry with considerable production capacity and production level in the packaging industry

cpp can be produced in two ways: single-layer salivation and multi-layer coextrusion salivation. The single-layer film mainly requires good low-temperature heat sealing performance and flexibility of the material. The multi-layer coextrusion salivation film can generally be divided into three layers: heat sealing layer, supporting layer and corona layer. In terms of material selection, it is wider than the single-layer film, and the relative humidity can be selected separately by 80%; Choose materials that meet the requirements of all levels and endow the film with different functions and uses. Among them, the heat sealing layer should be heat sealed, which requires that the melting point of the material is low, the heat fusibility is good, the heat sealing temperature should be wide, and the sealing product should be easy; The supporting layer supports the film and increases the stiffness of the film; The corona layer should be printed or metallized, requiring moderate surface tension, and the addition of additives should be strictly limited

After printing and bag making, CPP can be used alone for the outer packaging of food, clothing, sanitary napkins, flowers, etc., and can also be used as the base film of various composite films, such as compounding with PET film, BOPP film, etc., and used for packaging fast food products, tea, etc; It is compounded with barrier resins EVOH, PA, PVDC, etc. through adhesives, and is used to package foods containing oil or soup. Other applications such as high and medium temperature evaporation film and vacuum aluminum coating are also important. With the increasing market demand, the development of salivary film products mainly focuses on ultra-low temperature heat sealing film, cold resistant film, high temperature cooking film, etc. Some special-purpose films are also being developed and applied, such as antistatic films, pesticide films, highly transparent and ultra flexible films, which are gradually being introduced to the market and occupy new application fields

with the development of CPP production scale and extrusion equipment, the use of raw materials and the range of options are increasing, which makes the polypropylene special material for salivation develop in the direction of more refinement, specialization and higher performance. Various special materials with more refined division of labor continue to emerge, and each material plays its own role at different levels, giving the film new properties to meet different market needs. At the same time, the special production of high-performance raw materials for the special requirements of users is also emerging, which will bring greater profits to the resin production enterprises

at present, the hot spot in the development of special materials is low-temperature heat sealing materials. The industrialized butene/propylene random copolymer is a newly launched product in the market. Compared with the conventional B/C random copolymer, when the heat sealing temperature is the same as 100 ℃ -112 ℃, the heat sealing strength of this product is much higher, and there is less frost and fog

in recent years, with the strengthening of the consumer market, the application field of CPP has been expanding and developing rapidly. So far, there are more than 30 CPP manufacturers, more than 40 production lines, and the total production capacity is about 150000-170000 tons/year. The cleaning method of Jinan assay tensile machine however, the special material for salivation film is more dependent on imported material than BOPP film and film blowing. At present, the annual import volume accounts for about 60% of the total consumption. However, the calculation formula edited in the domestic CPP special experimental data collection and test experimental software can accurately and automatically generate the calculation results. The variety of materials used is relatively single, which is only produced by Shanghai Petrochemical Co., Ltd. and Beijing Yanshan Petrochemical Company. It is generally used for composite film heat sealing layer, while semi cooking film, aluminized film, resin for high-temperature cooking film, etc. are generally used for composite code heat sealing layer. In addition, the multi-layer coextrusion blown film market is in the growth stage in the past two years, and some varieties of CPP films are subject to competition and impact

at present, CPP has become an indispensable product in the packaging industry. Manufacturers use new equipment and materials to continuously expand production scale, improve production efficiency and increase product types; Expanding new application fields, but salivary film still depends partly or entirely on imports. How to speed up its localization is a major problem that needs to be solved as soon as possible in the plastic processing and resin production industries

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