JPH0144825B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel method for preventing tailing in cold patch batch dyeing in which dyeing is carried out continuously using reactive dyes.

Conventionally, a cold patch batch dyeing method as disclosed in Japanese Patent Publication No. 56-3945 has been known, but according to this method, circular knitted knitted fabrics, etc. are continuously dyed in a cylindrical shape. Although it has the advantage of being able to dye efficiently with relatively compact equipment, it has the advantage of being able to dye efficiently with relatively compact equipment, but on the other hand, it has the advantage of being able to dye efficiently with relatively compact equipment.
There is a drawback that a phenomenon called ``2'' occurs, and a solution to this problem is desired.

The present invention has been made as a result of intensive research on these points, and is characterized by a cold pad batch dyeing method using reactive dyes, in which the fabric is immersed in a dye solution. The time required to reach the squeezing solution is 0.5 to 2.0 seconds, and the dye solution is squeezed out immediately before selective adsorption of the dye used occurs, and the dye solution consumed by picking up as the fabric runs is constantly replenished. It's about doing.

That is, the present invention is characterized in that when dipping and squeezing are performed continuously, the time from dipping to squeezing is very short, 0.5 to 2.0 seconds, so that the liquid is squeezed out immediately. This will be explained in detail below.

The illustrated drawing schematically shows the apparatus used in the present invention, and its configuration includes an introduction reel 2, a feed roll 3, a dye tank 4, a guide roll 5, a regulation roll 6, a nip roll 7, a feed reel 8, 9, 1
0, it consists of a shake-off device 11, and new liquid supply devices 12, 12 are provided thereto.

Taking the case where a tubular knitted fabric is used in the present invention as an example, the knitted fabric 1 is sequentially introduced into a dye tank 4 via an introduction reel 2 and a feed roll 3 in an overfeed or tensionless state, and then a guide roll 5
After passing through the process, it is pulled up in a state impregnated with the dye solution, and a balloon is formed by filling air into it.Nipprol 7
After being squeezed, it is fed out by feeding reels 8, 9, and 10. In such a configuration, the present invention reduces the time from the dye bath 4 to the nip roll 7 by 0.5 to 2.0.
This is actually possible by shortening the distance from immersion in the dye solution until it is squeezed out, so-called dip time, or by running at high speed. In other words, this idea is to shorten the dip time to reduce the selective adsorption of dyes that cause tailing, and to run at high speeds to quickly consume the dye liquor in the dye liquor tank 4 and make it possible to use new liquor quickly. The purpose is to dye both the starting end and the ending end under the same conditions by replenishing the dye solution next time.Replenishing the necessary amount of dye solution in this way means that the reactive dye remaining in the dye solution tank 4 is This prevents decomposition by alkali and prevents changes in density and hue.

It should be noted that the new liquid is supplied by the new liquid supply devices 12, 12 either constantly or in a constant quantity under the control of a timer or a liquid level controller (not shown).
This is a system in which a dye solution and auxiliary agents such as an alkali and a dipping agent are separately prepared, and the necessary amounts are mixed together using an alkali mixer or the like and then supplied.

In the dyed object treated in this way, the dye used is not selectively adsorbed, and new solution is always supplied, so that the conventional tailing phenomenon can be eliminated.

In addition, in the present invention, setting the time from immersion to squeezing to less than 0.5 seconds may cause staining due to insufficient penetration and problems in handling the equipment due to increased speed. If it exceeds this, selective adsorption of the dye will become large, which is not desirable.In addition, in the case of cylindrical deformation, it is possible to correct distortions and wrinkles by expanding the cloth by filling air after dipping, and the squeezing liquid has a squeezing rate of 85 to 110.
%, a rubber hardness of 45 to 45 degrees shore is used, which is suitable for preventing edge marks.

Further, as the dye used in the present invention, commonly used reactive dyes such as vinyl sulfone type, fluorochloropyrimidine type, and dichloroquinosaline type can be used. The treatment object obtained by the above method is left to stand at room temperature for 4 hours or more, or the dye is fixed by high frequency heating, infrared heating, etc., to complete the treatment. This will be explained below with reference to examples.

Example 1 A 50# milled circular knit fabric of cotton thread was passed through the following prescription reactive dye solution (gray color) at a running speed of 30 m/min.
After dipping for a second, after 0.5 seconds, the liquid was squeezed with a 50 degree shore roller to a 90% squeezing rate, fixed at 25℃ for 15 hours, and then soaped using the usual method. Obtained.

Levafix Yellow E-3RL (Bayer)
0.6g/ 〃 Red E-4B 0.4g/ Blue E-B 2.4g/ Leonil KS (Hoechst) 10.0g/ Soda ash 15.0g/ Example 2 A 50# pile circular knitted fabric of cotton yarn was treated with the following recipe reactive dye solution (Brown). color) at a running speed of 35 m/min.
After immersing for 0.5 seconds, after 0.3 seconds, the liquid was squeezed to 90% squeezing rate with a 55 degree shore roller, and after fixing at 25℃ for 15 hours,
As a result of soaping using a conventional method, a product with no tailing and no dark spots compared to conventional win-dyed products was obtained.

Cibacron Yellow F-3R (Ciba Geigy)
2.0g/ Scarlet F-3G 20.0g/ Navy Blue F-G 4.5g/ Urea 100g/ Leonil KS (Hoechst) 5g/ Soda ash 40g/ Caustic soda (38 degrees Baume) 2c.c./

[Brief explanation of drawings]

The drawing is a side view illustrating the apparatus used in the present invention. 1...Knitted fabric, 4...Dye liquid tank, 7...Nipprol, 11, 12...New liquid supply device.

Claims (1)

[Claims] 1. In the cold patch batch dyeing method using reactive dyes, the time from immersing the fabric in the dye solution to squeezing the solution is 0.5 to 2.0 seconds, and dyeing is carried out immediately before selective adsorption of the dye used. A method for preventing tailing in cold pad batch dyeing, which is characterized by squeezing the liquid and constantly replenishing the dye liquid consumed as the fabric runs.