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Blow extrusion of plastic film. The manufacture of plastic film for products such as food packages, shopping bags, and continuous sheeting is achieved using a blown film line. [5] This process is the same as a regular extrusion process up until the die. There are three main types of dies used in this process: annular (or crosshead), spider, and ...
Founded in Milan in 1953, Covema (Commissionaria Vendita Macchine) first devoted itself to the commercialization of plastic processing machinery. This marketing activity was a great help to the growth and development of the Luigi Bandera spa in Busto Arsizio, which at the time was making the first blown film extrusion lines to produce plastic bags and films.
A tube of extruded film being blown to expand. A film blowing machine involves one process used to make plastic film. Extruded tubular processing is most often used with polyethylene films but can be used with other polymers. [1] The film may be laminating film, shrink film, agricultural covering film, bags or film for textiles and clothing ...
In extrusion blow molding, plastic is melted and extruded into a hollow tube forming a tube like piece of plastic with a hole in one end for compressed gas - known as a parison. The parison is captured by closing it into a cooled metal mold. Air is blown into the parison, inflating it into the shape of the hollow bottle, container, or part ...
Cast – Plastics extrusion can cast film which is cooled or quenched then wound up on a roll. 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]
More specifically, Borealis polyolefins are used to make applications possible in flexible packaging (including blown film, heat seal and extrusion coating), rigid packaging (caps and closures, bottles, thin wall packaging, thermoforming), non-woven and technical fibres, and appliances.
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