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 ?
11, customers avoided paying for cellophane wraps because the TSA might rip them off minutes afterwards.
Cellophane film was obtained from Kesorm Rayon Ltd.
For each ornament, cut cellophane into 10 to 12 circles 2 1/2 to 3 1/2 inches in diameter.
Suncatcher Heart You will need: Pink cellophane Glitter glue Method: Fold the cellophane in two and cut out a heart so you have two heart shapes.
Try following a smoker opening a fresh packet of fags: off comes the cellophane, which is dropped on to the pavement, next goes the foil, then the match.
Fortunately, a customer told Haeberli and Hoang about a company that manufactures cellophane bags that are 100 percent biodegradable and made from specially farmed trees.
In the musical, Chicago, the character Amos sings the song Mister Cellophane which has the line "see right through me, never know my name".
The money was down when Mr Cellophane disappointed under Frankie Dettori at Yarmouth last week, but he raced pretty freely in a single-figure field, giving the impression that the 7f trip on soft ground stretched his stamina after a two-month absence.
To keep the flowers from touching the fruit salad, wrap the vase in cellophane and place it in the cut-out watermelon.
To make Moxon's Mechanick Exercises, or, the Doctrine of Handy-Works Applied to the Art of Printing (1999), the third installment, which was finished first, Gatten used a time-consuming process that involves affixing cellophane tape to book pages, removing the pulp by immersing the pages in hot water, and transferring the remaining ink directly to the filmstrip by hand.
I received this little green envelope with a piece of cellophane covering with my name and department and the amount .