KR840000043B1 - Process for the treatment of textiles in jet dyeing apparatus - Google Patents

Abstract

Textiles of rope form spun from mixed synthetic fiber is treated with gaseous or liquid agent in jet dyeing apparatus. Textile is circulated in endless form in bath sealed to the atmosphere, and treated under isothermal condition with fluidizing steam avoiding unnecessary cooling and reheating step. Kinetic energy transferred tangentially to textile by gas flow pressure from complex nozzle is used for textile transportation.

Description

Fabric treatment method in jet dyeing machine

The present invention relates to a process for treating rope-like fabrics woven from natural or synthetic fibers or blended fibers of these fibers with a gaseous or liquid treatment agent in a jet dyeing apparatus, which can be hermetically sealed against ambient air pressure. This is done by circulating the fabric in endless form by placing the fabric to be treated in a bath, circulating the treatment in the same direction and acting on the crop, while maintaining the same state for at least the treatment period.

Methods of this kind are well known in the textile industry. An important feature of this type of operation is that the rope-like fabric is equally struck by the kinetic energy produced by tangentially striking the treatment liquid in the dyeing machine onto the rope-like fabric passed through the nozzle through one or several nozzles. It is to be purified to move. The circulation of the rope-like fabric is similar to that of the winch back, but in this case the transport of the fabric is not carried out by the rotation of the winch, but by the circulation of the treatment liquid and the pressure of the treatment liquid from the nozzles. .

German Patent Application Laid-open No. 2659086 discloses a method of applying a gas stream to a liquid in the flow system of the fabric and the liquid through an additional nozzle, in addition to the liquid transporting the fabric, in order to create bubbles in the liquid containing the blowing agent. It is. Improved distribution of liquid to rope-like fabrics is expected.

In all known treatment methods using jet dyeing apparatus, the transport of the fabric through the treatment table is based on the presence of the treatment liquid. That is, the introduction of the fabric into the dyeing apparatus itself, which performs similarly through a nozzle, requires the presence of liquid in the dyeing apparatus. Feeding the fabric into a jet dyeing machine in a dry state has not been possible until now.

In some cases, especially if the fabric has already been pretreated in a continuous operation or for no reasonable reason such pretreatment, the rope-like fabric should be fed into a jet dyeing machine without the use of a liquid treatment medium for dyeing.

In the practice of dyeing and other treatment methods, the discharge of the treatment liquid and the supply of other treatment liquids, i.e. for a short time each time the bath is changed, is carried out by means of purely mechanical devices (winds, rollers). It is a defect in jet dyeing that must be stopped or maintained. Another impairment of the efficiency of known working methods is the fact that the process of simultaneously putting the pretreatment liquid and the fabric into a jet dyeing apparatus and the subsequent heating process of bringing the fabric to dyeing temperature with steam require a separate operating step.

As a result, heating the fabric in all known ways can only be done through the treatment liquid itself. It is therefore an object of the present invention to enable the transport of fabric into or into the jet dyeing apparatus when the dyeing apparatus is not filled or insufficiently filled with the treatment liquid. Such a case is particularly interesting when it is desired to achieve a very low bath ratio in the wet treatment operation.

The problem is that, according to the present invention, the kinetic energy transmitted when the gas discharged from the nozzle or the composite nozzle under overpressure impinges the fabric in tangent to the direction of movement of the fabric into the jet dyeing device of the rope-like fabric or It was solved by using it for transportation through the dyeing apparatus.

According to the principle of the present invention using gas flow as the driving device for rope-like fabrics, the difficulties arising from transporting the fabrics by fluid alone have been surprisingly overcome.

By treating the rope-like fabric with a gas jet in the jet dyeing apparatus according to the present invention, the fabric can be introduced into the empty jet dyeing apparatus without the action of a fluid, ie a pretreatment bath. For the treatment according to the new method, the fabric to be treated must be in a dry state or in a water-containing state. In most cases by using flow steam as the gas, simultaneous feeding into and out of the dye bath and heating of a uniform and fast fabric and piece-dye unit are effected depending on the steam temperature. Subsequent operations in the liquid medium can then be carried out isothermally by introducing the treatment liquid at the temperature of the heated fabric. Thus, unnecessary cooling and reheating in the middle of the individual process steps can be avoided.

A particularly valuable applicability of the process of the invention is the use of heat-adhesive dyes according to the batchwise exhaustion method, in which the fabric to be dyed is placed in a dye bath, steamed and evacuated—this dye for ambient air pressure. Sealing bath-heating to approximately dyeing temperature using steam, then bringing the whole dyeing solution into contact with the fabric and liquid in a steam-filled dyeing bath under overpressure acting on the treatment liquid at the dyeing temperature, finally isothermal This is done by circulating the fabric at the same time while circulating the dye solution. By operating the jet nozzle partially or fully using a gas (usually steam), it is possible to perform a piece-dyeing operation in accordance with the so-called rapid color principle.

In other cases, air or nitrogen (if oxygen contained in the air is not desired) can be used as a propellant to initiate or maintain the transport of the fabric.

After the dye bath is filled with the treatment liquid, the fabric is continuously transported with the treatment liquid and gas stream. In general, in the wet treatment operation, the method of the present invention facilitates the transport of the fabric using the gas stream and the bath circulation through the pure white pump. In addition to treating the rope-like fabric with a gas jet as an additional or single means, the circulation of the fabric in the jet dyeing machine can be mechanically assisted by a drive roller or roller system at the same time.

In the present invention, the treatment process can be carried out at a very low bath ratio by the above-mentioned specific means and by special measures to reliably improve the sliding characteristics of the fabric at the bottom of the container.

Improved sliding of the dyeing can be achieved by directing the fabric onto a round rod, polygonal rod or rat-shaped profile arranged parallel to the direction the fabric is circulating on the bottom of the container. .

The smooth surface condition of the sliding device described above made of a heat resistant synthetic material, preferably polytetrafluoroethylene, facilitates uniform distribution of the fabrics into the storage compartment and their transport, thereby avoiding undesirable local packing of the fabrics. prevent. The outer diameter of the profile is in the range of 0.5 to 5 cm, preferably 1.5 to 3 cm. The above-mentioned sliding device is generally arranged 1 to 10 cm above the bottom surface of the dye bath, but the spacing is irrelevant for implementing the method of the present invention.

Lateral spacing between rods or profiles is chosen to ensure reliable fabric circulation, depending on the nature of the rope-like fabric. Lateral spacing of 1 to 3 cm is appropriate and can be adjusted as needed.

By means of a device and means according to the method of the invention, withdrawal and recharging of the treatment bath under isothermal conditions and, if not necessary, at temperatures higher or lower than 100 ° C .; At the same time, the continuous circulation of the fabric is possible due to the transport of the fabric by the gas stream. This means that the overall processing time is considerably shortened and undesirable stagnation of the fabric is avoided.

Moreover, this method of operation makes it possible, for the first time, to carry out a multi-stage heat treatment step continuously without requiring stagnation of the fabric and intermediate cooling of the fabric when uniformity is required under high temperature conditions. This allows the fabric to continue to be transported at an intermediate stage without treatment solution and heat loss. In this case the transport of the fabric is carried out by one of the gases or the fluids or a mixture of both. This method of modification is particularly useful for dyeing, for example after alkalizing polyester fibers or filament fabrics.

Another advantage of the new method of operation can be found in the dyeing process of fabrics containing textured polyester filaments, where the optimal shrinkage effect reduces the risk of wrinkles and deformation. The advantages according to the method of the invention are also given when the treatment following the first treatment bath is not carried out under isothermal conditions.

Jet dyeing apparatuses, dyeing apparatuses, etc., which are well known to experts, can be suitably carried out in the processing operation for the textile process within the scope of the dyeing apparatus of the method of the present invention, and other finishing agents that remain permanently on the fabric instead of the dye. Can be used. However, all the processes used for pretreatment or aftertreatment, especially water washing, can also be carried out according to the new principles.

The following examples merely illustrate the possibilities offered by the novel method but are not intended to limit the scope of the invention.

Example 1

A dry knitted fabric made of polyester fiber material textured into a known dyeing device is placed on a rope, the fabric being transported to a drive roller at a vapor overpressure (about 128 ° C.) controlled at 1.5 bar. Under mechanical assistance by means of steam, it is carried out using the steam flow from the nozzle.

After the feeding process is completed, the fabric is sealed to form an endless rope-like fabric. Thereafter, the inlet opening of the jet dyeer is sealed and the fabric is circulated once more using distillation continuously (same conditions as above).

The condensate from the bottom of the dye bath is discharged and collected for reuse. By the action of steam, the temperature to the circulating fabric is raised to approximately the temperature of the indented steam, and the dyeing tank itself is filled with steam of the same temperature.

After this treatment for 10 minutes to heat the fabric, with the aid of compressed air, about 130% of the following general formula of disperse dyes (based on the weight of the fabric) in the form of an aqueous dispersion and adjusted to a pH of about 4.5 The aqueous dye solution at 0 ° C. is introduced into the dye bath from the sealed production vessel through the nozzle against the vapor pressure (condensation) therein.

The flow of the rope-like fabric is maintained by the introduced treatment liquid, and is continuously transported to the treatment liquid circulation by the circulation pump after the inflow process is finished. Steam introduction is suppressed during this treatment step. The fabric circulated faster using the indented treatment solution is dyed for 20 minutes at 130 ° C. with a bath ratio of 1: 5.5.

The treatment liquid is then discharged through the hot outlet. At this time, the transport of the fabric is gradually taken over and carried out by the vapor of the nozzle in accordance with the gradual discharge of the dyeing apparatus. A first wash bath at about 105 ° C. is introduced into the device without purifying the fabric. The steam supply to the nozzle is then stopped. The transport of the fabric is carried out only through the cooling bath. Reductive purification is carried out by introducing sodium hydroxide solution, hydrosulfite and auxiliaries in amounts commonly used at about 80 ° C. into the bath. After about 10 minutes under this condition, the treatment liquid is discharged again and washed with warm water (about 50 ° C.) and cold water to complete the post treatment. This results in a uniform red stain on the knit fabric.

Example 2

In a jet dyeing machine, 70 kg of dry cotton knit fabric is placed on a rope. It is carried out using the vapor stream discharged from the nozzle system at a controlled steam overpressure (approximately 120 ° C.) and the treatment liquid supplied through the nozzle at the same time. The treatment solution is heated to 30 ° C. and the fabric to be dyed is wetted by the mechanical action of steam and water flow.

After the feed process is complete, the flow through the nozzle is blocked and the knitted fabric is sealed to form an endless rope-like fabric. Subsequently, the jet dyeing apparatus is evacuated only by momentarily operating the nozzle with steam. The inlet opening of the jet dyeing device is then sealed, and the fabric is circulated again until the temperature of the treatment liquid reaches 60 ° C. by using a vapor stream (same conditions as above) and circulating the treatment liquid.

In this process, 1 g / l ethylenediamine sodium tetraacetate-based sequestering agent, 20 cm 3 / l of 32.5% sodium hydroxide solution and 2.5 g / l sodium dithionite are sequentially added to the aqueous bath before The kiri liquor is circulated for 5 minutes to disperse the material. Subsequently, 3% of Vat Orange 7 dye (C. No. 71105), based on the weight of the dry fabric, is suspended in a small amount of water at 40 ° C in a jet dyeing apparatus.

The fabric is dyed for 30 minutes at 60 ° C. with the treatment solution thus prepared, and the fabric is transported only to the circulating treatment solution. After dyeing, the treatment liquid is discharged, and the fabric is transported by steam discharged from the conveyor nozzle according to the discharge of the dyeing apparatus. Cold water is supplied to clean the dyed fabric. The cleaning is done without going through an intermediate step and without purifying the fabric.

The transport of the fabric by steam is maintained until a sufficient amount of water takes over the action alone in the dyeing apparatus. This will soon stop the supply of steam to the nozzle.

In the meantime, the washing water is allowed to reach a temperature of 30 DEG C, followed by overflowing with cold water, and washing until the dyeing obtained is clean. After that, the water supply to the jet dyeing unit was stopped, the water in the dyeing unit was heated to 30 ° C., and the leuco compound used for the fabric was batted by applying 2 cm 3 / l of 33% hydrogen peroxide during the 10 min treatment. Oxidize. Rather than stagnating the dye, supply cold water and wash until the dye is clear.

After drying, a knitted fabric uniformly dyed orange is obtained. The dyeing operation performed here is excellent in the following points: By carrying out a one-step dyeing process without any intermediate step, the dyeing time of 20 to 30 minutes is shortened by the means according to the present invention, and compared to the hydrophilic method. The consumption of sulfite is reduced by about 10%.

Claims (1)

In a jet dyeing apparatus, rope-like fabrics woven from natural or synthetic fibers to be treated or blended fibers thereof are circulated in an endless form by placing them in a bath which is hermetically sealed against ambient pressure. In a fabric processing method in which a gaseous or liquid treatment agent is circulated in the same direction and applied to the fabric while maintaining this state for at least the treatment period, the gas discharged under overpressure from the nozzle or the composite nozzle is tangential to the traveling direction. A method of treating a fabric in a jet dyeing device, characterized in that the kinetic energy delivered when impinging on the bed is used for transporting to or through the device on the rope.