Pre-treatment equipment – polyester imitation silk pre-treatment equipment – continuous alkali reducer
Continuous alkali reducing machines mainly include Debaca from Italy, M type from Onomori from Japan, and Holland from Brugman from the Netherlands.
Its basic components include padding machine, steaming box, washing machine, etc., as shown in Figure 10-16.
This machine is a kind of open-width continuous alkali reducing machine, with a maximum speed of 60m/min and a steam box temperature of 120°C.
(1) Padding machine: The immersion tank of the padding machine has a double-layer closed structure, which can obtain a stable temperature. The liquid tank bath ratio is small, and the fabric passes through multiple cloth guide rollers to increase the immersion time. The maximum line pressure of the two-roll station-type small rolling mill is 200N/cm, which is suitable for small batch and multi-variety production and has fast recovery of alkali liquid.
(2) Steaming box: The steaming box is of guide roller type and can be used under high temperature and normal pressure. The air flow is a natural convection method of blowing out from the upper part and inhaling from the lower part. The bottom is equipped with a steam direct heating tube and heat transfer tube. Oil indirect heater, the inlet of the steam box is a steam seal, and the outlet is a water seal. The water seal tank can also be used as a cleaning tank, which can basically wash out the oligomers after the reaction. The steaming box adopts a multi-chamber modular design (the basic model has four chambers and a fabric capacity of 85m). There is a set of tension rollers between every two chambers to maintain a certain tension on the fabric. Some steam boxes are stacked loosely or arranged in long rings to reduce tension.
(3) Washing machine: The washing machine adopts a wave-type overflow washing machine. It has the advantages of low tension, high cleaning efficiency, small footprint and energy saving. When the fabric is being cleaned, the flow rate of the water at the same position on the front and back sides of the fabric is different, resulting in a pressure difference. The osmotic effect caused by the pressure difference causes the water on one side of the fabric to penetrate through the fabric tissue and flow to the other side. As a result of this osmotic flow, the residual alkali liquid and oligomers inside the fabric tissue are pushed to the surface of the fabric, and then the water on the fabric surface and the speed difference of the fabric are used to remove the residual alkali liquid and oligomers by shearing action. The object is washed away from the fabric to achieve the purpose of cleaning. There are also high-efficiency pad washing machines that use three-compartment zigzag cloth threading for water washing.
The main features of this equipment are: the finishing process is continuous, the process conditions of the fabric in the machine will not change instantaneously, and the weight reduction rate is uniform; process parameters such as padding pressure, steaming temperature, steaming time and alkali concentration They are all controlled by computers, so they can avoid the impact of changes in process conditions and parameters on fabric weight loss; fabric tension, water washing, air pumps, etc. can be automatically adjusted and are easy to operate; there is no need to use cationic surfactants as accelerators. Compared with the hanging trough treatment, the amount of caustic soda can be greatly reduced; the finished product feels soft, has good drape, and has a soft finish. The disadvantage is that the fabric is still subject to greater tension during processing, which will damage the crepe effect of crepe fabrics to a certain extent. In addition, the equipment investment is large, and the output per unit time is also lower than that of the hanging tank dipping method.
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