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BoPET film has been used in the production of banjos and drumheads since 1958 due to its durability and acoustical properties when stretched over the bearing edge of the drum. They are made in single- and double-ply versions, with each ply being 2–10 mils (0.051–0.254 mm) in thickness, with a transparent or opaque surface, originally used ...
Two methods are widely used for producing BOPP films, namely, a bi-directional stenter process or a double-bubble blown film extrusion process. [39] Biaxial orientation increases strength and clarity. [40] BOPP is widely used as a packaging material for packaging products such as snack foods, fresh produce and confectionery.
They were rebranded Innovia Films. The acquisition expanded the company's footprint by providing a manufacturing facility in Mexico. Their manufacturing process is the Tenter system. In 2020 CCL Industries acquired Flexpol S.p.a. a BOPP films producer in Plock, Poland who have both Tenter and Cast polypropylene production.
[2] [3] [4] This consists of a 37.5μm thick polypropylene sheet sandwiched between two 0.1 μm polyolefin sheets, [4] [3] creating a thin film 37.7 μm thick. The molten polymer undergoes snap cooling as it passes by gravity feeding through a brass mandrel , which imparts on the thin film many properties, including its transparency . [ 2 ]
The original production process uses carbon disulfide (CS 2), which has been found to be highly toxic to workers. [2] The newer lyocell process can be used to produce cellulose film without involving carbon disulfide. [3] "Cellophane" is a generic term in some countries, [4] while in other countries it is a registered trademark.
Extruded film can be stretched, thinned, or oriented in one or two directions. Blown or tubular process forces air into an extruded ring to expand the film. Flat tenter frames stretch the extruded film before annealing. [3] [4] Calender rolls can be used to form film from hot polymers [5] Solution deposition is another film forming process.
Cosmo Films (Now Cosmo First Limited [2]) is an Indian multinational corporation that manufactures bi-axially oriented polypropylene films (BOPP) for packaging, label, lamination and industrial applications. The company is headquartered in New Delhi, India. [3] Its manufacturing units are situated in India and South Korea.
Shrink wrap, also shrink film, is a material made up of polymer plastic film. When heat is applied, it shrinks tightly over whatever it is covering. When heat is applied, it shrinks tightly over whatever it is covering.