| 摘要 |
PURPOSE:To improve both heat resisting and bend fatigue characteristics ever so better as well as to make durability improvable, by setting a twist multiplier of warp in canvas to a specific condition, in case of a conveyor belt which makes the canvas a core body and wraps it with heat resisting rubber before its vulcanization molding. CONSTITUTION:A conveyor belt 1 is constituted of canvas 4 as a core body and both sides of each of heat resisting rubber layers 2 and 3. And, the canvas 4 is produced in the following proceses that crude yarn obtained of spinning a fiber is doubled and twisted with proper pieces, making a primary twist yarn 5, then plural pieces of this primary twist yarn are further doubled and twisted, making combined twist yarn 6, and this combined twist yarn 6 is woven as setting it down to warp 7 and weft 8, respectively. In this case, a twist nuber T (time/ 10cm) of the combined twist yarn is generally expressed a relative formula as T=K/D<1/2>, but a twist coefficient K of the combined twist yarn 6 is to be set in a range of 1200<=K<=2000. And, size of a woven fold 9 of the canvas 4 obtained of spinning the combined twist yarn 6 is to be set in a range of 0.5X0.5mm.-5X 5mm.. |
