cellophane


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cellophane,

thin, transparent sheet or tube of regenerated cellulosecellulose,
chief constituent of the cell walls of plants. Chemically, it is a carbohydrate that is a high molecular weight polysaccharide. Raw cotton is composed of 91% pure cellulose; other important natural sources are flax, hemp, jute, straw, and wood.
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. Cellophane is used in packaging and as a membrane for dialysisdialysis
, in chemistry, transfer of solute (dissolved solids) across a semipermeable membrane. Strictly speaking, dialysis refers only to the transfer of the solute; transfer of the solvent is called osmosis.
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. It is sometimes dyed and can be moisture-proofed by a thin coating of pyroxylinpyroxylin
, partially nitrated cellulose (see nitrocellulose). It is used in lacquers, plastics, and artificial leathers. Pyroxylin lacquers are made by dissolving pyroxylin in a mixture of volatile solvents and adding a plasticizer and a pigment or dye.
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. There are several steps in the preparation of cellophane from raw cellulose. The cellulose is first treated with an alkali, e.g., sodium hydroxide, and mixed with carbon disulfide to form viscose (see viscose processviscose process
, method widely used for the commercial preparation of rayon. Cellulose, prepared from either wood pulp or, less commonly, cotton linters, is treated with sodium hydroxide (an alkali) and then with carbon disulfide, the resulting product being a substance called
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). The viscose is aged for several days and then forced through a straight or circular slit into a dilute acid solution. The dissolved cellulose precipitates, and this regenerated cellulose has a lower molecular weight and a less orderly structure than the cellulose from which it is formed.

Cellophane

 

a thin, transparent, sheet material obtained from viscose (see alsoHYDRATED CELLULOSE FILMS). It is mainly used as a packaging material and as an artificial casing for sausage products.

cellophane

[′sel·ə‚fān]
(materials)
A thin, transparent sheeting of regenerated cellulose; it is moisture-proof, and sometimes dyed, and used chiefly as food wrapping or as bags for dialysis.
References in periodicals archive ?
The first clue pointing to Cellophane Man came from an incomplete DNA profile obtained from blood on a piece of cellophane found on the floor next to the head of Miss White, pictured.
Scientists made even further progress when full profiles of Cellophane Man were found on Miss White's jacket and jeans.
Repeat the above steps for the blue and green cellophane, giving you three torches that shine red, green and blue light.
Kullman is proud to partner with KieranTimberlake for the building of the Cellophane House," says Avi Telyas, CEO of Kullman.
Manchester-based, independent adhesive formulator and manufacturer, Itac solved the problem by creating an FDA Approved adhesive which does not interfere with the label's ability to alter hue, yet adheres well to the cellophane wrapping.
Obsessed with paper of all kinds, Don Victor accomplishes his greatest feat with the invention of cellophane, "as diaphanous as Fata Morgana's veil," in 1952.
Made from wood pulp from renewable forests, the Cellophane technology has even been used to develop a range of biodegradable and compostable films.
13 bar; good printability; stiffness enables production of hard packaging and blow-molded products; crease resistance--same as that of cellophane, and approx.
brick of glycerin soap * essential oils * soap dyes * small plastic rectangular container * sharp knife * clear cellophane * colored ribbon
This gives each player the opportunity to examine the cellophane in which the cards are wrapped, the box, and the cards themselves before and after the box is opened.
I like the idea of cellophane wrap on my bag, but isn't that a problem for security?
The machines read addresses best through low-gloss type windows--polystyrene, cellophane and glassine all work well.