Properties and uses of BOPP film

By choosing different raw material formulas and process conditions, products with different specifications, different performances and different uses can be manufactured. BOPP film can be divided into three types according to performance and application: general-purpose, heat-sealing, and capacitive.

(1) Universal BOPP film. The product is made of PP as raw material, with appropriate amount of additive masterbatch. The product has the characteristics of good uniformity, high strength, high transparency, small heat shrinkage, low moisture permeability, and moderate corona treatment. It can be used to print colored pictures, calendars, packaging patterns and trademarks; it can be used as the base of various adhesive tapes to make adhesive tapes; it can be used for vacuum metallization, and a thin layer of tight structure Metal foil, made of BOPP aluminized and other packaging materials, is widely used in food, clothing, utensils, tea, coffee, milk powder and other packaging. Common specifications for this type of product include 20um printing composite film, 30um adhesive tape film and 40um calendar film.

(2) Heat-sealing BOPP composite film. The product can be made of PP and COPP (ethylene-propylene copolymer) with appropriate additives and co-extruded three-layer film. It can also be made by coating a thin layer of chlorinated polypropylene (or vinylidene chloride-acrylate-acrylonitrile) with BOPP film as the base material. In addition to the characteristics of general-purpose optical film, this kind of product also has low-temperature heat-sealing performance, relatively

Low friction coefficient and moisture permeability. This product is widely used in all kinds of packages that require direct heat sealing and require to maintain a flat surface and good appearance. Such as candy, biscuit, food and other carton outer packaging, all kinds of magnetic tape outer packaging, especially suitable for tobacco packaging. Tobacco packaging develops rapidly at home and abroad, and BOPP tobacco packaging film quickly replaces cellophane because of its light weight and moisture resistance. used as smoke

The BOPP heat-sealing film for grass packaging is required to be smoother and have a lower surface friction coefficient (below 0.38) to adapt to high-speed packaging. The commonly used specification is 22um.

(3) Capacitive BOPP film. This kind of product is made of PP raw material with high purity and ash content less than 0.1×10-3. In addition to general-purpose basic properties, it is also necessary to have good electrical properties such as breakdown voltage, volume resistance, dielectric constant, and dielectric loss. These products are used in the manufacture of oil-impregnated power capacitors and metallized film capacitors. Product specifications below 20pm, and in

Developing in the direction of thinness, the thinnest BOP capacitor film has reached 4um ~ 6um.