DE3325958A1 - Method for the continuous fixing of reactive dyes - Google Patents

Abstract

In the dyeing of cellulose webs with reactive dyes, dye fixing without prior intermediate drying is more and more popular in practice. While wet batch processes require suitable machinery for this object and are therefore cost-intensive, in the case of fixation by wet-steaming difficulties occur again and again as a result of flucuating steam conditions and on account of condensation phenomena. According to the invention, the existing problems are dealt with by preheating the wet material from dye application with IR or microwave radiation to from 75 DEG C to the boiling point of the liquor and then immediately thereafter steaming for 1-15 seconds with HT steam.

Description

Continuous fixing method

of reactive dyes The present application relates to a process for fixing padding liquors applied to textile webs with reactive dyes by preheating the web and briefly steaming with superheated steam.

In DE-PS 811 946 a device is described which consists of a There is a printing machine, a damper and a dryer, combined into one compact system. A special feature of the damper is that it is in an integrated form a preheater is connected upstream, which with hot air or superheated steam, or through IR beam he or high frequency radiator is operated. The purpose of this system is Prints that at that time were mainly made with vat dyes are, since reactive dyes were not yet known, in one operation, that is fully continuous, to print, fix and dry. The fixation should go through the preheating can be accelerated so that a small damper was sufficient for this. The temperature therefore becomes as high as possible during preheating, i.e. H. as close as Usually brought to the boiling point of water. The steaming itself takes place with wet or saturated steam by blowing the printed goods with steam.

This procedure, which is designed for fusing prints, Can be used to fix reactive dyes padded onto textile webs are not used because the inflated wet steam, the applied liquor faded and thus uneven colorations would be produced. This can be due to printing the heavily thickened printing paste didn't happen.

From DZ AS 2 658 863 there is another method for continuous Dyeing of textile webs is known, also, but separately at the front damper preheated and at the same time the water content is reduced before steaming. In order to should the t41-grition of the applied dyes as well as a condensation and a The dilution of the liquor associated with this is primarily encountered on the surface of the goods. Preheating takes place by means of IR radiation or microwaves to temperatures from 97 - 104 ° C. A reduction in the water content of the goods should definitely be achieved take place only at these temperatures, but ntlr in the presence of air, at least not in saturated steam is possible. Especially to achieve short steaming times partial evaporation is beneficial because it increases the concentration of the rate-limiting factor for dye fixation is increased In DE-OS 27 40 967 finally describes a similar process in which the preheating takes place by means of direct flame action on the textile web. It is then steamed, if necessary, in saturated steam.

In all of the processes mentioned, a lot of energy has to be expended for heating will. There is also the risk of original legalities due to the relatively long fixing times, especially when fixing reactive dyes, cannot be ruled out. Often it is Distance between pre-heater and damper too large so that the goods cool down, then again, the dimension of the preheating shafts is too large, the transport routes for the Goods are too long.

The present invention is therefore based on the object of a method to create, according to the reactive dyes applied to textile webs quickly and it doesn't matter, it can be fixed without a particularly large expenditure of energy.

This object is achieved in that one of the Applizierell Reactive dyes from wet web continuously very quickly on 75 ° C to the maximum boiling point of the liquor and heat it immediately afterwards briefly steamed with overheated steam.

By preheating to 75 ° C up to the maximum boiling point of the liquor partial drying takes place, but sufficient moisture remains the goods back so that the fixation can be carried out with superheated steam.

The purpose of the present invention is to immediately after Padding caused by an infrared heater or high frequency Heating process to heat up the wet goods completely evenly in an extremely short time and thereby initiate the fixing process. The goods must not be heated during this process dry.

The procedure is carried out as follows: The application of the Fleet containing reactive dyes is produced by padding, spraying, foaming, Paddling, etc. made. The wet arenbahn then runs through you immediately IR slot or microwave slot installed in front of the damper. This one is either built in a straight line or it contains pulleys for higher speeds. The goods are heated to 75 ° C to the boiling point of the liquor. The heating process takes 1 - 15 s, with no significant reduction in web moisture. It is an advantage to dry to 30-50% moisture. Immediately afterwards is steamed with superheated steam at 120 - 140 ° C. The steaming process also lasts only 1 - 15 s, preferably only 3 - 10 s.

The reactive dyes are complete, free of migration and no matter fixed.

The required device does not require much effort and the The energy requirement can be precisely adapted to the needs in the process.

Example 1 A mercerized cotton fabric with a basis weight of 115 g / m² is padded on a padder at room temperature and a liquor pick-up of 60% (based on the weight of the dry goods) with an aqueous liquor which contains per liter: 20 g of the reactive dye formula 20 g of the reactive dye of the formula (CuPc = copper phthalocyanine) 30 9 sodium sulfate (anhydrous) and 22 cm3 sodium hydroxide solution 32.5%.

The padded goods are then passed through an IR shaft for 9 seconds, heated to 90 ° C and then for 10 s in a pressureless steamer with steam from 160 ° C blown.

The result is a uniform, brilliant green coloration.

Example 2 A bleached cotton fabric with a linen weave (104 g / m²) is padded at room temperature, the liquor pick-up 55%, based on the Weight of the dry goods. The padding liquor contains 15 gil of the dye CI No. 61 200, Reactive Blue 19, and 40 g / l Duisburg sodium sulfate "R" and 20 ml / l sodium hydroxide solution 32.5%.

The material is passed through an IR slot at 87 for 7 seconds ° C and then for 12 s in a pressureless steamer with steam at 150 ° C blow. The result is a brilliant, completely even and deep blue coloration.

Claims (5)

Claims 1. A method for the continuous fixing of on textile Fabric webs of uniformly applied reactive dyes characterized by that the wet 6Zare is quickly heated to 75 ° C to the boiling point of the liquor and immediately afterwards 1 to 15 s is steamed with HT steam. 2. The method according to claim 1, characterized in that the preheating dan takes place within 0.3 to 15 s. 3. Process according to claims 1 and 2, characterized in that the steam treatment is carried out at temperatures of 100 - 180 ° C 4. Procedure according to claim 1, characterized in that the preheating is carried out with IR radiators will. 5. The method according to claim 1, characterized in that the preheating done with microwaves.