"Cellophane" is a generic term in some countries, while in other countries it is a registered trade mark.
Cellulose from "wood, "cotton, "hemp, or other sources is dissolved in "alkali and "carbon disulfide to make a solution called "viscose, which is then extruded through a slit into a bath of dilute "sulfuric acid and "sodium sulfate to reconvert the viscose into cellulose. The film is then passed through several more baths, one to remove "sulfur, one to bleach the film, and one to add softening materials such as "glycerin to prevent the film from becoming brittle.
A similar process, using a hole (a "spinneret) instead of a slit, is used to make a fibre called "rayon. Chemically, cellophane, rayon and cellulose are "polymers of "glucose; they differ structurally rather than chemically.
Cellophane was invented by Swiss chemist "Jacques E. Brandenberger while employed by Blanchisserie et Teinturerie de Thaon. In 1900, inspired by seeing a wine spill on a restaurant's tablecloth, he decided to create a cloth that could repel liquids rather than absorb them. His first step was to spray a waterproof coating onto fabric, and he opted to try viscose. The resultant coated fabric was far too stiff, but the clear film easily separated from the backing cloth, and he abandoned his original idea as the possibilities of the new material became apparent.
It took ten years for Brandenberger to perfect his film, his chief improvement over earlier work with such films being to add glycerin to soften the material. By 1912 he had constructed a machine to manufacture the film, which he had named Cellophane, from the words cellulose and diaphane ("transparent"). Cellophane was patented that year. The following year, the company Comptoir des Textiles Artificiels (CTA) bought the Thaon firm's interest in Cellophane and established Brandenberger in a new company, La Cellophane SA.
"Whitman's candy company initiated use of cellophane for "candy wrapping in the United States in 1912 for their "Whitman's Sampler. They remained the largest user of imported cellophane from France until nearly 1924, when "DuPont built the first cellophane manufacturing plant in the US. Cellophane saw limited sales in the US at first since while it was waterproof, it was not moisture proof—it held water but was permeable to water vapor. This meant that it was unsuited to packaging products that required moisture proofing. DuPont hired chemist William Hale Charch, who spent three years developing a "nitrocellulose lacquer that, when applied to Cellophane, made it moisture proof. Following the introduction of moisture-proof Cellophane in 1927, the material's sales tripled between 1928 and 1930, and in 1938, Cellophane accounted for 10% of DuPont's sales and 25% of its profits.
The British textile company "Courtaulds' viscose technology had allowed it to diversify in 1930 into viscose film, which it named "Viscacelle". However, competition with Cellophane was an obstacle to its sales, and in 1935 it founded "British Cellophane Limited (BCL) in conjunction with the Cellophane Company and its French parent company CTA. A major production facility was constructed at "Bridgwater, "Somerset, England, from 1935 to 1937, employing 3,000 workers. BCL subsequently constructed plants in "Cornwall, Ontario (BCL Canada), as an adjunct to the existing Courtaulds viscose rayon plant there (from which it bought the viscose solution (AKA dope)), and in 1957 at "Barrow-in-Furness, Cumbria. Those last two plants were closed in the 1990s.
Cellulose film has been manufactured continuously since the mid-1930s and is still used today. As well as packaging a variety of food items, there are also industrial applications, such as a base for such "self-adhesive tapes as "Sellotape and "Scotch Tape, a "semi-permeable membrane in a certain type of "battery, as "dialysis tubing (Visking tubing), and as a release agent in the manufacture of "fibreglass and "rubber products. Cellophane is the most popular material for manufacturing "cigar packaging; its permeability to moisture makes cellophane the perfect product for this application as cigars must be allowed to "breathe" while in storage.
Cellophane sales have dwindled since the 1960s, due to alternative packaging options. The "polluting effects of "carbon disulfide and other by-products of the process used to make viscose may have also contributed to this; however, cellophane itself is 100% "biodegradable, and that has increased its popularity as a food wrapping.
When placed between two plane polarizing filters, cellophane produces prismatic colours due to its "birefringent nature. Artists have used this effect to create stained glass-like creations that are kinetic and interactive.
Cellophane is biodegradable, but highly toxic "carbon disulfide is used in most cellophane production. Viscose factories vary widely in the amount of "CS2 they expose their workers to, and most give no information about their quantitative safety limits or how well they keep to them.
In the UK and in many other countries, "cellophane" is a registered trademark and the property of Futamura Chemical UK Ltd, based in "Wigton, "Cumbria, United Kingdom. In the US and some other countries "cellophane" has become "genericized, and is often used informally to refer to a wide variety of "plastic film products, even those not made of cellulose, such as "plastic wrap.
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