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Manufacture of other machinery and equipment
Joy Mining Machinery designs and manufactures equipment in four categories for low, mid and high seam applications for both room + pillar and longwall mining:
- Continuous Miners
- Haulage Products
- Bolting Systems
- Longwall Systems (Shearers, Armored Flexible Conveyors and Roof Supports)
- Joy Mining Machinery is the leading supplier or has a significant position for a majority of the products it manufactures. Independent research* on the use of longwall equipment in the US shows that more than 90% of shearer products, and nearly 50% of the Armored Flexible Conveyors and roof support products, have been supplied by Joy Mining Machinery.
- Joy Mining Machinery has an extensive installed equipment base with over 4,500 products working in underground mines around the world.
- Drawing the fibres are straightened
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- Several slivers are combined. Each sliver will have thin and thick spots, and by combining several slivers together a more consistent size can be reached. Since combining several slivers produces a very thick rope of cotton fibres, directly after being combined the slivers are separated into rovings. These rovings (or slubbings) are then what are used in the spinning process.
- Generally speaking, for machine processing, a roving is about the width of a pencil.
- Drawing frame: Draws the strand out
- Slubbing Frame: adds twist, and winds on to bobbins
- Intermediate Frames: are used to repeat the slubbing process to produce a finer yarn.
- Roving frames: reduces to a finer thread, gives more twist, makes more regular and even in thickness, and winds on to a smaller tube
A Combing machine
From Wikipedia, the free encyclopedia : Manufacture of other machinery and equipment
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