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Plastic wrap, cling film, Saran wrap, cling wrap, Glad wrap or food wrap is a thin plastic film typically used for sealing food items in containers to keep them fresh over a longer period of time. Plastic wrap, typically sold on rolls in boxes with a cutting edge, clings to many smooth surfaces and can thus remain tight over the opening of a ...
For example, at 23 °C and 95% relative humidity polyvinylidene chloride has an oxygen permeability of 0.6 cm 3 μm m −2 d −1 kPa −1 while low-density polyethylene under the same conditions has an oxygen permeability of 2000 cm 3 μm m −2 d −1 kPa −1, or a factor of over 3,000 times more permeable. [15]
[3] [4] The material was then neutralised with an alkali. [3] The product was cast as a sheet on an endless belt which passed through a dryer that drove off the solvent. [5] [6] The finished product was around 30% chlorine. [4] It could be made thinner by stretching whilst being heated and thicknesses of 0.00075–0.025 inches (0.019–0.635 mm ...
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. [1] [2] [3] Heat can be applied with a handheld heat gun (electric or gas), or the product and film can pass through a heat tunnel on a conveyor.
Many films have about 500% stretch at break but are only stretched to about 100–300% in use. Once stretched, the elastic recovery is used to keep the load tight. There are two methods of producing stretch wrap: Blown: the resin is melted and extruded through an annular die, it is air-cooled. This is a slower process but provides for higher ...
Cellophane is also used in transparent pressure-sensitive tape, tubing, and many other similar applications. Cellophane is compostable and biodegradable, and can be obtained from biomaterials. [ 1 ] The original production process uses carbon disulfide (CS 2 ), which has been found to be highly toxic to workers. [ 2 ]