JPS5939559B2 - Wet processing method for textiles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for wet-processing textiles using a high-temperature dyeing device equipped with a heat exchanger for indirectly heating and cooling the textiles to be wet-processed and the dye liquor.

The high-temperature dyeing apparatus is equipped with a heat exchanger for heating and cooling the wet-processed fabric and the dye liquor.

Steam and water are supplied to this heat exchanger for heating and cooling, respectively.

Conventional wet processing equipment, in which the fabric is directly immersed in a high-temperature dye solution to dye it in one color and then washed with water, is operated by inserting water and the fabric to be dyed into the dye tank, and then After high-temperature steam is sent into a heat exchanger and heated to 40°C, a dyeing agent and an auxiliary agent are added to the dyeing bath, the temperature of the dye liquor is raised, and dyeing is performed, and then the fabric is sampled.

During sampling, it is necessary to maintain the temperature at about 80° C. to prevent color unevenness between the part of the fabric being sampled and the part of the fabric immersed in the dye solution.

Therefore, the sampling operation is carried out after the dyeing temperature reaches 80° C. or lower by feeding cold water into the heat exchanger.

During the sampling operation, when the temperature of the dye liquor drops to about 50° C., the dye liquor is discharged and the fabric is flushed one to three times with water.

In such conventional methods, cooling water that has been heated by passing through a heat exchanger is often directed to a discharge conduit without being utilized.

However, it is also known to store the cooling water and reuse it later as cooling water.

However, this requires large storage containers, which reduces the effectiveness of reusing the cooling water.

The object of the invention is to provide a method for the wet treatment of textiles, which makes it possible to save large amounts of water without requiring additional costs.

This problem can be solved according to the present invention when wet-processing textiles using a high-temperature dyeing device having a heat exchanger, during the cooling phase when the heat exchanger is supplied at a low temperature and the heat exchanger is heated. The solution is to supply the leaving water directly to the wet treated fabric as wash water.

In the wet throughput method according to the invention, it is particularly advantageous to supply the fabric with water flow from the heat exchanger as soon as the temperature of the fabric has fallen below about 100°C.

The drawing schematically shows a wet processing apparatus for carrying out the method of the invention.

A heat exchanger 9 is attached to the dyeing tank 1. Cooling water is supplied to the heat exchanger 9 through a regulating valve 6 during the cooling phase, and steam is supplied to the heat exchanger 9 via a regulating valve 5 during the heating phase. are being supplied respectively.

The water heated by passing through the heat exchanger 9 is removed via a drain valve 8, and the condensed water is removed via a separate pipe fitted with a drain valve I.

According to the present invention, heated water is supplied to the dyeing tank 1 from a pipe provided with a discharge valve 8 via a regulating valve 3 to directly cool and wash the dyeing tank 1.

This washing starts when the temperature of the fabric and dye liquor is below 100°C, preferably below 80°C, and is advantageously carried out over a temperature range of 80° to 50°C.

During this time, the fabric is sampled in the same manner as in the past.

While the water discharged from the heat exchanger 9 is at a temperature of 80° C. or higher, it is desirable to open the discharge valve 8 and supply the hot water to an external storage device (not shown).

In the figure, 4 is an overflow valve for keeping the liquid level in the dyeing tank 1 constant.

Further, 10 is a supply valve provided on a pipe for supplying new water to the dyeing tank 1 before the dyeing operation, and 2 is a discharge valve provided on a pipe for discharging the dye liquor from the dyeing tank 1 after the dyeing operation.

In the wet processing method according to the present invention, after the high-temperature dyeing operation is completed, the dye liquor is cooled in order to sample the dyed fabric, and when the temperature of the dye liquor drops to about 80°C or less, the dye liquor is used for cooling. The heated water from the heat exchanger 9 is sent directly to the dyeing tank 1 via the control valve 3.

The dye liquor in the dyeing tank 1 is discharged through a discharge valve 2.

The dyed fabric is thus both cooled and washed during sampling.

The cooling and washing of the fabric takes place according to a predetermined program or time-temperature relationship.

In order to cool and wash the fabric according to a predetermined program, the change in temperature of the dye liquor over time is measured with a suitable measuring device, and the opening degree of the control valve 3 is automatically adjusted according to the measured temperature of the dye liquor at that time. The amount of water according to a predetermined program may be supplied from the control valve 3 into the dyeing tank 1 per unit time.

The control valve 3 is thus opened when the temperature of the dye liquor is, for example, below 80°C, and is closed when it is above 80°C, and the cooling water discharge valve 8 is kept open at all times. I can do it.

The level of water supplied via the regulating valve 3 is always kept at a constant value by an overflow valve 4 which is opened when the regulating valve 3 is opened.

If the heat exchanger 9 or the incoming water is not collected in a storage device, the water savings due to the cooling washing step from approximately 80° C. to 50° C. described above will be at least equivalent to the volume of the dye bath 1.

Also, if the water from the heat exchanger 9 is collected in a storage device, the amount of water saved will be less, but there is an advantage that the volume of the cooling water storage tank will be smaller.

Although the wet processing method according to the invention is particularly suitable for the cold cleaning of textiles in a temperature range of about 80°C to 50°C according to a preset program, the above-mentioned The temperature range can also be quite wide.

By using pre-warmed wash water, temperature differences inside the dye bath are eliminated, the cooling effect is improved, and wash water and working time can be saved.

The wet processing power method according to the invention also has the advantage that existing high-temperature dyeing equipment can be adapted to the method with only slight modifications to its structure.

[Brief explanation of drawings]

The drawing is a schematic explanatory diagram showing a processing apparatus for carrying out the wet processing method of the present invention. In the figure, 1 is a dyeing tank, 2, 7.8 is a discharge valve, 3.5.
6 is a control valve, and 9 is a heat exchanger.

Claims (1)

[Scope of Claims] 1. When wet-processing textiles using a high-temperature dyeing device equipped with a heat exchanger for indirectly heating and cooling the textiles and dye liquor to be wet-processed, heat exchange is performed during the cooling phase. 1. A method for wet processing of textiles, characterized in that water that is supplied to a container at a low temperature and leaves a heat exchanger in a heated state is directly supplied as wash water to the textiles to be wet-processed. 2. The wet processing power method according to claim 1, characterized in that the diverted water from the heat exchanger is supplied to the fabric immediately when the temperature of the fabric becomes about 100° C. or lower.