Biaxially stretched polyester film (BOPET for short) is […]
Biaxially stretched polyester film (BOPET for short) is made of bright material (also called big bright material, which means that the titanium dioxide content of the raw polyester chips is 0.1%, after drying, melting, extrusion, casting and vertical and horizontal drawing Stretched high-end film, widely used). BOPET film has the characteristics of high strength, good rigidity, transparency, high gloss, etc .; odorless, tasteless, colorless, non-toxic, outstanding strength and toughness; its tensile strength is 3 times that of PC film and nylon film, and the impact strength is BOPP 3-5 times the film, with excellent wear resistance, folding resistance, pinhole resistance and tear resistance; the heat shrinkage is extremely small, at 120 ℃, only shrink 1.25% after 15 minutes; Good antistatic property, easy to vacuum aluminize, can be coated with PVDC, thereby improving its heat sealability, barrier property and printing adhesion.
BOPET also has good heat resistance, excellent cooking resistance, low temperature freezing resistance Property, good oil resistance and chemical resistance. With the exception of nitrobenzene, chloroform, and benzyl alcohol, most of the BOPET film cannot dissolve it. However, BOPET will be corroded by strong alkali, so please pay attention when using it. BOPET film has low water absorption rate, good water resistance, and is suitable for packaging food with high water content. Uniaxially stretched polyester film (abbreviated as CPET) is a film made of semi-dulling material (added titanium dioxide to raw material polyester chips), dried, melted, extruded, cast and longitudinally stretched. The grade and price are the lowest, mainly used for packaging of pharmaceutical tablets.
Due to less usage, manufacturers have less large-scale production, accounting for about 5% of the polyester film field, Chinese enterprises also import less, the standard thickness is 150μm. Due to the characteristics of polyester film determines its different uses. Polyester films for different purposes have different requirements for raw materials and additives, as well as processing techniques, and their thickness and technical indicators are also different; in addition, only BOPET has multiple uses, so the films classified according to use are BOPET high The barrier performance and heat resistance of the film: the use of nano-materials with special properties and unique processing technology, so that the nano-materials are uniformly dispersed in the nano-size PET matrix, through stretching orientation in the film production process, so that the PET film is extremely excellent The barrier performance transmittance drops exponentially, and the heat resistance is also greatly improved, which can expand the application field of PET, greatly extend the shelf life of the packaged goods, and can also be used for hot filling or disinfection Sterilization occasions. Different manufacturers have different classification names according to the quality of polyester film.
Chinese manufacturers cable insulation material are generally divided into superior products, first-class products and qualified products, while foreign manufacturers are generally divided into A-level products, B-level products and C-level products. Among the products sold by general manufacturers, Grade A products account for 97-98%, Grade B products only account for 2-3%, Grade C products are unqualified products, and are not sold in the circulation field. The main reason is that the price of raw materials is high. Generally, manufacturers use the recycled materials as raw materials, or sell them as staple fibers to textile mills for textile raw materials. Foreign manufacturers sometimes sell stock films on a quarterly or semi-annual basis as Grade B products. This practice is a consistent practice of some manufacturers in Southeast Asian countries, with the goal of reducing inventory.