The singeing process and points for attention
When the fabric passes quickly through the flame, the scattered fluff on the fabric can quickly heat up and burn, while the cloth is thicker and denser, and the temperature rises slowly, leaving the flame when the temperature of the fabric has not risen to the point of ignition. Thus it can not only burn down the fluff but not burn or damage the fabric. Of course, fabric at high temperature for a long time will also be damaged, should be paid attention to. According to the above analysis, it can be considered that the condition of increasing temperature difference between wool and fabric itself is more favorable to the burning of wool. Therefore, the current tendency is to speed up reasonably under the condition that the flame is strong enough. The thermal properties of polyester fiber must be taken into account when it is sintered. It is a kind of thermoplastic fiber, which can melt at 485 °combustion (230 °) 240 °soften 255N 260 °, and the effect of heat will cause the change of polyester properties. To this end, more attention should be paid to increase the temperature difference between the fluff and the cloth body, either burning down the fluff at a stroke or raising the temperature of the cloth too high, otherwise, the firing is not easy to clean, and it is easy to melt the polyester wool into a small ball, which results in defects after dyeing. Or a larger contraction of the door, cloth body hard. In order to achieve this goal, besides controlling the flame temperature and the distribution speed, some necessary measures should be added. One is to blow cold air on the cloth surface between adjacent vents and before dropping the cloth, and the other is to install cold water rollers above the fire mouth. It is effective to use cold water roll to reduce the temperature of cloth, and it can prevent the excessive burning through the hole of thin fabric, but the temperature of cooling water should be controlled properly. In order to improve cooling efficiency and prevent condensation water droplets on the roller surface. After firing, the fabric is often stained with Mars, if not extinguished in time, easily cause the fabric burning or causing holes. So immediately after passing through the last fire, the fabric goes into the fire tank or box to extinguish the remaining sparks. The fire-extinguishing tank contains hot water or desizing liquid, and is installed with guide roll and guide roll. Fire extinguishers can be used for some varieties that need dry cloth.