JPS5835676Y2 - continuous dyeing equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a continuous dyeing device for spun tow, which has particularly good dyeing fastness and dyeing uniformity of the dyed tow, and eliminates the discharge of dye-containing waste liquid during the dyeing process. This relates to a continuous dyeing device that does not have any.

Conventionally, various methods have been proposed for dyeing wet-spun synthetic fibers in a tow state.

For example, in the continuous dyeing of polyacrylonitrile tow, the spun tow is passed through a dye solution flowing in countercurrent through a series of stepwise connected vessels, and at the point where the tow leaves the vessel, Japanese Patent Publication No. 50-10431 proposes a method of adjusting the amount of dye supplied so that the dye concentration is high and the dye concentration is extremely low at the entrance where the tow enters the container.

Although hydrogel fibers can be dyed efficiently using this method, the dye adsorption behavior of hydrogel fibers, the adjustment of the dye concentration in the dyeing bath, and the dye shedding behavior during the washing process of dyed fibers must be maintained under constant conditions. One of the difficulties is that it is difficult to dye the tow without causing dyeing spots in the thickness direction of the tow and in the fiber axis direction.

In addition, dyed tow needs to be washed after washing, and there are problems in treating the wastewater containing dye discharged during this washing process, and dyes are also contained in the wastewater drained from the dyeing bath for tow. Therefore, a great deal of effort must be put into processing it.

This continuous dyeing method for tow is applicable not only to wet-spun tow, but also to continuous dyeing of dry-spun tow, which has been actively developed in recent years.

Another disadvantage of continuously dyed tow is that it lacks color fastness.

In view of the above-mentioned current situation, the present invention enables the production of uniformly dyed tow with few dyed spots and good dyeing fastness, and eliminates the need for dyeing wastewater facilities or This was the result of a study to develop a dyeing device that could be made extremely small and save on operating costs. This is a continuous dyeing device consisting of a dyeing device, a heat treatment device for dyed tow, and a washing machine for dyed tow. It is located in a continuous dyeing device connected via a liquid pump via a pipeline.

An example of the dyeing apparatus of the present invention will be explained with reference to FIG.

2 is a countercurrent washer for spinning tow, 1 is a liquid receiving tank thereof, and 3 is a liquid supply port of the countercurrent washer for tow.

4 is a back roller located in the liquid receiving tank, and 5 is a front roller located on the exit side of the countercurrent washer.

6 is a dyeing tank, 7 and 8 are guide rollers, 9 is a squeezing roller, and 10.11 is a dipping roller.

14 is a heat treatment device, and 12, 13, 15, 16 and 17 are guide rollers.

20 is connected to the lower end of a countercurrent washer 21 for tow dyed in a liquid receiving tank.

18 is a back roller, 22 is a front roller, and 23 is a water injection pipe.

Reference numeral 19 denotes a waste liquid discharge port of a washing waste water receiving tank for dyed tow, which is connected by a pipeline 24 to a washing liquid supply port 3 for spinning tow via a liquid sending pump 25 .

The continuous dyeing device of the present invention is most effective when used as a continuous dyeing device for tows made of wet-spun hydrogel-like acrylonitrile fibers or dry-spun coagulated acrylonitrile fibers.

In the conventional continuous dyeing equipment, there is no connection between the dyed tow washing waste liquid discharge port and the spun tow washing liquid supply port, and it takes a lot of effort to dispose of the dye waste liquid from dyed tow. However, the device of this invention is
The structure is such that the dye-containing waste liquid is reused as washing water for the spun tow, so the dye supplied to this dyeing device is almost completely adsorbed into the fibers, preventing the dye from getting mixed into the waste water. There are hardly any.

In addition, preliminary dyeing is performed during the washing process of the spun tow, and by combining this with the main dyeing process, dyed I-U with no staining spots and high color fastness can be obtained.

Furthermore, a major feature of the present invention is that a heat treatment device 14 is provided after the main dyeing tank.

As this heat treatment device, one selected from a normal pressure steamer, a pressurized heating steamer, a hot plate, a heating roller, and a hot water treatment bath can be used, and these heat treatment devices can also serve as a stretching device.

Since the dye adsorption power of the tow treated by this heat treatment apparatus is significantly improved, the amount of dye washed out in the washing process of the dyed tow is reduced, so that process control of the dyeing apparatus of the present invention becomes extremely easy.

As the dyeing tank 6, various types of dyeing tanks can be used, such as a room temperature immersion type, a hot solvent immersion type, and a pressure heating type.

Next, one or more staining examples using the apparatus of the present invention will be shown.

The first tow was made by dry spinning an acrylonitrile polymer copolymerized with 3% sodium methallylsulfonate using a conventional method.
It was washed using a countercurrent washing machine with hot water flowing as shown in the figure.

In this washing machine, dye-containing wastewater discharged from washing of dyed tow is passed through a wastewater outlet 19 to a pipeline 2.
4 and is supplied through the liquid supply port 3 by the liquid feeding pump 25.

Next, the tow, which was light colored but uniformly dyed with no dyeing spots in the thickness direction of the tow and in the fiber axis direction, was then subjected to main dyeing in a dyeing tank 6 at room temperature, and then passed through heated steam at 105°C. After passing through the heat treatment device 14, the dyed tow was fed to a countercurrent washing machine 21 supplied with hot water and washed while being stretched.

The cleaning waste liquid is collected in the liquid receiving tank 20 and is discharged through the discharge port 19.
The liquid is supplied to the tow countercurrent washer 2 through the liquid supply port 3.

Waste water from washing the spun tow was collected in a liquid receiving tank 1, and then sent to a treatment process for solvent recovery.

In addition, a hydrogel tow obtained by dissolving the same acrylonitrile polymer used in the above dry spinning in dimethylacetamide and wet spinning using a conventional method was dyed using the continuous dyeing apparatus of the present invention in exactly the same manner as the above method. did.

When dyeing tow with the dyeing device of the present invention, the tow is first pre-dyed in the washing process and then main-dyed, so the dye with a low concentration is absorbed first and then the main dyeing is carried out. Therefore, the dye is evenly adsorbed into the yarns forming the tow, and this prevents differences in dye adsorption speed between the yarns forming the tow, resulting in no dyeing spots and fast dyeing. Can be made into tow-dyed products with excellent propertiesb
In addition, since the tow dyed in this manner is further heat-treated, the adsorption efficiency of the dye into the yarn forming the tow is further increased, making it possible to obtain a tow dyed product with extremely good color fastness.

As described above, the present invention connects the waste liquid discharge port for washing the dyed tow with the liquid supply port of the countercurrent type water washer for unstretched tow by a pipeline via a liquid sending pump. Since the dye in the low concentration dye-containing waste liquid of several percent can be almost completely adsorbed to the tow in a swollen state after solidifying in a countercurrent washing machine, not only is there no need to dispose of the dye-containing waste water. This is also advantageous in terms of thermoeconomics since it is used to wash away the solvent contained in the spun, undrawn tow.

In addition, since the dye supplied to the tow dyeing system can be completely adsorbed into the tow, there is no tilling phenomenon that occurs due to differences in dye affinity in so-called tow dyeing, and it is extremely stable in the vertical direction. It is possible to reduce spots and has an extremely large practical effect.

[Brief explanation of drawings]

FIG. 1 shows the continuous dyeing apparatus of the present invention. 1...Tow washing waste water receiving tank, 2...Tow countercurrent washer, 3...Liquid supply port, 4...
...Back roller, 5...Front roller,
6... Dyeing tank, 7, 8... Guide roller, 9... Squeezing roller, 10.11...
・Dipping roller, 12゜13.15, 16.17...
... Guide roller, 14 ... Heat treatment device, 18
... Back roller, 19 ... Waste liquid discharge port, 20 ... Waste water receiving tank, 21 ... Washing machine for dyed tow, 22 ... ... Front roller, 23 ... Water injection pipe, 24 ... Pipeline, 25 ... Liquid pump.

Claims (5)

[Scope of utility model registration request] (1) A continuous dyeing device consisting of a countercurrent washing machine for spun tow, a dyeing device for washing washed tow, a heat treatment device for dyed tow, and a washing machine for dyed tow, which includes a washing machine for dyed tow. A continuous dyeing device in which the waste liquid discharge port is connected via a pipeline to the liquid supply port of a countercurrent washing machine for spun tow. (2) The continuous dyeing apparatus according to claim 1, wherein the countercurrent washing machine for the spun tow is a countercurrent hot water washing machine. (3) The continuous dyeing apparatus according to claim 1, wherein the heat treatment apparatus for dyed tow is selected from a hot water bath, a steam bath, a heated roller, and a hot plate. (4) The continuous dyeing device according to claim 1 or 2, wherein the heat treatment device for dyed tow is a hot stretching device. (5) The continuous dyeing apparatus according to claim 1, wherein the dyed tow washing machine is a tow stretching machine.