Hemp is the pericyclic fibre obtained from Cannabis sativa Linn., belonging to family Cannabinaceae.
HEMP
Biological Source
Hemp is the pericyclic fibre obtained from Cannabis sativa Linn., belonging to
family Cannabinaceae.
Geographical Source
Hemp is grown at any altitude from Norway to the Equator.
The raw materials are imported from China, Hungary, America, Germany,
Switzerland, Australia, Canada, France, and Norway.
History
The history of Cannabis
sativa dates back to more than 6,000 years. The history of China has in its
credit of having a Hemp textile production even before 4,500 B.C. which later
spread to Asia in around 1,000 B.C. and reaching Europe by 800 B.C. In 1175 Cannabis sativa was grouped under
taxable goods, and in 1535 an act came into force which compelled all land
owners to sow 1/4 of an acre, or otherwise they be fined was formed by Henry
VIII. During this period Hemp became a major crop and till 1920s about 80% of
clothing was made from Hemp textiles. Traditionally, Hemp was processed by
hand, which required huge labour and was costly. In 1917 American George W.
Schlichten invented and patented a new machine for separating the fibre from
the internal woody core (‘Hurds’) reducing labour costs. By 1930, due to the
tough competition by the other varieties of hemp imported by Philippines and
Mexico, the hemp production by United States had fell to less than 200 acres.
Later on during World War II, farmers in the United States were encouraged to
cultivate both cannabis hemp and flax for the purpose of war under the banner
of ‘Hemp For Victory’, In 1937 the production of Cannabis sativa was restricted except for industrial use or research purpose but in 1970 its
production was categorized as illegal for all purpose. In 1992/93 the first
licenses were granted for growing Hemp of the low THC varieties (THC is the
narcotic substance found in the leaves) under the ruling that Hemp is grown for
‘special purposes’ or ‘in the public interest’. At present, approximately 2,500
hectares are being grown.
Chemical Constituents
Hemp mainly consist of cellulose and lignin.
Uses
Hemp is mentioned historically to have more than 25,000
diverse 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.
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