The Saw Gin belongs to second-generation tool invented by Eli Whitney in 1794, in the USA and the latest version is shown in following figure. It consists of a series of circular saws, 305 to 407 mm (12 to 18 inches) in diameter. All the saws are mounted closely on an axle and are made to revolve at high speed in order to tear the lint away from a roll of seed cotton. The saw projects slightly between bars or ribs, which are so, spaced that they prevent the seed from going forward. Fibres are thus torn away from the seeds with high speed. The seed cotton is fed continuously into a rounded box or hopper. The action of the saws keeps it revolving in a loosely compacted roll. The seed falls through a grid into a collecting box or seed conveyor. The lint is whipped off the teeth of the saws by high-speed brushes or an air blast.
The Saw Ginning Technology is normally used for short and medium staple cotton i.e. up to 28 mm and the plant designs developed so far in the world is keeping in view the machine picked cotton with higher trash contents and most of the cleaning equipments and feeders to the gins have been designed to handle high trash cotton however the fibre parameters get deteriorated in terms of neps, length and spinability parameters more particularly when any long or extra long fibre is ginned on Saw Gin.
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