Class (93) = Natural Fibers (Part 02) | Cotton | Jute | Hemp (Source, Preparation and Uses)

Download "Solution Pharmacy" Mobile App to Get All Uploaded Notes, Model Question Papers, Answer Papers, Online Test and other GPAT Materials - https://play.google.com/store/apps/details?id=co.bolton.nqilv COTTON Synonyms Sans-karpas; Hind. Beng- Kapas; Mar- Khapus. Biological source: Cotton consists of the epidermal trichomes (epidermal hairs) of the seeds of Gossypium herbaceum Linn and other species of Gossypium. Family: Malvaceae. Preparation: Bolls of cotton are collected from the ripe and dehisced fruits of Gossypium. The trichomes are separated from the seeds by a ‘ginning’ process. Raw cotton is subjected to combing process so as to separate short fibres are spun and woven as cloth. The combers waste consisting mainly of short fibres is boiled with dilute caustic soda and soda ash solution for 10-15 hours at a pressure of 1-3 atmospheres. Bleaching is done by treatment with sodium hypochlorite solution and dilute hydrochloric acid. It is washed with water and dried and finally sterilized. Constituents: Raw cotton contains about 90 percent of cellulose and small amounts of wax and fat remains of protoplasm and ash. Absorbent cotton is almost pure cellulose. Uses: It employed as a surgical dressing; it serves as a mechanical protection to absorb blood, mucus or pus and to keep bacteria from infecting wounds, It is also used as a filtering medium and an insulating material. HEMP Biological Source: Hemp is the pericyclic fibre obtained from Cannabis sativa Linn., belonging to family Cannabinaceae. Chemical Constituents: Hemp mainly consists of cellulose and lignin. Uses: The historically mentioned uses are printing inks, paints, varnishes, paper, bibles, bank notes, food, textiles (the original Levi’s jeans were made from Hemp cloth), canvas and building materials. Due to its high tensile strength, bast fibres are ideal for such specialized paper products as: tea bags, industrial filters, currency paper, or cigarette paper. JUTE Synonym: Gunny Bio