The dyeing of the fabric in the dyeing machine, the temperature is more than 100℃, the dyeing machine will produce pressure, at this time can not be used to wipe the wet cloth, because the glass is affected by the temperature difference, will produce intense thermal expansion and contraction, so that the collapse, and even cause a major accident. In addition, when the bath ratio is adjusted, the upper and lower ends of the cut-off valve should be closed in time.