Since there is usually some slippage between the warp sheet and the surface of the back roller, the wavelength of the fault produced in the fabric is likely to be rather greater than the circumference of the back roller.

• 这种现象只有在后梁能灵活自如地转动时才消失。通常由于后梁表面与经纱片之间会有一定的相对滑动,织物中的疵点片段长度有可能大于后梁的周长。