JPS6156348B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for dyeing and/or finishing, drying and fixing lengths of textile material in a continuous process, and also to related to a device for

PRIOR ART One method for impregnating and drying textile materials is known from DE 2214714.4-26, in which the material is treated with an impregnating solution containing a flammable organic fluid, which organic fluid impregnates the material. Burned to dry. Burning out (hereinafter referred to as burnout) of an organic fluid (e.g. methanol) supplied to a length of textile material with an impregnating solution on or in close proximity to the material provides rapid and uniform heat transfer, thus providing rapid and uniform heat transfer over a short period of time. complete drying within a short distance. Even for particularly critical materials such as polyester or cotton/polyester blend fibers, running is avoided and uniform drying is obtained with this method.

Similarly, a dye solution (containing a flammable organic fluid) is applied to a length of textile material, dried by burnout of this organic fluid, and then a so-called thermal contacting device with a number of cylinders is applied. Devices for feeding fixed bands including
2246781.8-26). These cylinders are arranged in a chamber heated by hot air, around which the length of textile material is wrapped. The dried dyestuff and/or finishing medium is fixed into the fibers by contacting the length of material with the cylinder (a process known in the dyeing art as the "thermosol method"). In this known method, the exhaust gases produced by the burnout of the organic fluid in the drying zone are sent to the fixing zone, so that the heat content can be utilized for the fixing process.

It has now been found that some improvements in the further development of this known method are desirable.

Depending on the combustible organic medium used, a certain minimum temperature is required in the combustion chamber in order to achieve complete combustion or to ensure that the exhaust gas is free of harmful substances (this minimum temperature may be , approximately 600℃).

Furthermore, since the metal objects in the drying zone are heated, in order to achieve a constant residual moisture, drying should be started at a low speed of movement of the material and only after a certain period of time (approximately half an hour) has elapsed. For the first time, you have to increase the speed to the final speed. In this way,
Continuous operation of dry zones with this equipment arranged one behind the other is extremely difficult, if not entirely impossible.

For heavy materials, varying penetration resulting from varying velocities creates irregularities. On the other hand, in the case of lighter fabrics, which absorb less solution and thus are supplied with less energy overall, the heating times are very long and give rise to the risk of incomplete combustion.

Problem to be Solved by the Invention It is therefore an object of the invention to provide a method according to the preamble of claim 1, in which continuous operation is achieved at a constant speed for all types of materials. The object of this method is to provide a method which combines the benefits of economical thermosol methods with the benefits of mild, low-diffusion drying.

Means for solving the problem According to the present invention, this object is achieved in the first claim.
This was achieved through the features of the section.

Effects Since the exhaust gas from the drying zone is then combusted in the stationary zone in the present invention, the drying zone in which the certain length of material is dried by burnout of the organic fluid can be operated at a constant speed. The desired residual moisture content in the length of material is controlled by the amount of air, and under these conditions a certain temperature (approximately 200-250°C) is maintained in the dry zone combustion chamber. Sets up rapidly. In such an operating method, residual harmful substances are still contained in the exhaust gas from the dry zone, which is then completely combusted in the stationary zone to form CO ₂ and water.

Such methods allow the use of relatively simple organic solvents such as methanol or ethanol, as well as more difficult solvents that may require higher temperatures and higher amounts of oxygen for complete combustion as well. However, the requirement for these difficult solvents does not exist in dry zones for material-related reasons.

It is likewise possible in the process according to the invention to operate with substantially shorter dye fixation times than in conventional processes (using separately operated tenter or cylinder fixing machines). Admitted. The main reason for this is to be found in the high proportion of water vapor contained in the exhaust gas from the dry zone (this amount is due to the water contained in the dye solution and the evaporation of water resulting from the combustion of the organic solvent). ). As a result, fixation of the dye is not carried out in dry air, but at high temperatures in an atmosphere enriched with water vapor.

Thus, in the method according to the invention, at a predetermined constant speed of the length of textile material, the dryness, i.e. the desired residual moisture in the length of material, is transferred to the combustion zone. It can be controlled by the amount of air fed and thus by the degree of combustion of the organic solvent. This is because complete combustion is ensured by the subsequent combustion of the exhaust gas in a fixed zone. This takes into account environmental and safety requirements on the one hand and is more economical on the other hand.

Another advantage of the method according to the invention is that it can be easily implemented with a simple structure. because,
This is because the capacity of a device operated according to the method according to the invention is determined to a large extent by its fixing zone (thermosol device), which has a secondary and /or a third chamber section may be provided. The device can thus also be used, for example, in heavy cotton fabrics, which would otherwise have insufficient evaporation capacity.

The advantages of the method according to the invention also include considerable energy savings as a result of the complete combustion of the exhaust gas from the drying zone in the stationary zone. The arrangement of fixed zones (thermosol devices) directly connected to the drying zone facilitates shorter heating times than required with known devices.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Advantageous embodiments of the invention are the subject matter of the embodiment claims and will be explained in more detail below with reference to the embodiments shown in the drawings.

The illustrated apparatus for dyeing and/or finishing, drying and fixing a length of textile material 1 comprises an impregnating zone 2, a drying zone 3 and a fixing zone 4. The impregnation zone 2 is equipped with a trough 5 and a pair of squeezing rollers 6. The retention zone 7 is arranged between the impregnation zone 2 and the drying zone 3.

The drying zone 3 includes a combustion chamber 8 through which the length of material 1 passes in vertical direction and the length of material 1 in the impregnating zone 2 with the dye or other finishing medium in solution. Organic solvents, such as methanol, are burned.

An igniter 9, which is located in the lower region of the drying zone 3 and consists of, for example, an infrared radiator and a gas flame, evaporates and ignites the methanol. The resulting combustion gases flow upwards (arrow 10) into the combustion chamber 8 along the radiation wall 13 and then downwards according to the arrows 11, 12 and into the exhaust gas outlet opening 14 connected to the fan.

The length of material 1 is guided over guide rollers 15 and removed from drying zone 3 via feed rollers 16. Fresh air is supplied to the drying zone 3 through the intake opening 17. A measured introduction of fresh air into the combustion chamber 8 takes place by means of an air valve 18;
This simultaneously prevents leakage of combustion gases. In the illustrated embodiment, as shown in particular in FIG. 1b,
The center lines 19a of the large number of cylinders 19 of the fixed band are included in the upper and lower two horizontal planes E ₁ and E ₂ in parallel and spaced apart by a certain distance T, and the center lines of each vertically adjacent cylinder are each included in the above-mentioned constant distance. They are arranged horizontally spaced apart and offset by half the distance T/2.

A hot air jet device 20 or 21 is arranged on each outside of this cylinder arrangement (i.e. above and below), in which jets 22 are provided in the mid-plane area of adjacent cylinders and in the gap area between successive cylinders. The hot gas exiting the jet 22 therefore preferably blows the length of material 1, on the one hand in the cylinder top zone area and on the other hand in the gaps between the successive cylinders (arrows 23,
24). A good heating effect on a certain length of material is thus ensured, since the cylinder 19, which is open at both ends, is likewise kept at the temperature of the hot air circulating from inside. It is.

Each of the upper and lower jet devices 20, 21 includes a fan 25 or 26 and an associated burner 2.
7 (burner 27 attached to fan 25 of the upper jet device can be seen in FIG. 2). The hot gas flowing out from the jet devices 20, 21 is drawn out from the chamber containing the cylinder 19 through the grid 28 by fans 25, 26, heated by the burner 27, and then supplied to the jet devices 20, 21 again. .

Exhaust gas pipe 29 connected to dry zone 3
opens into a hot air circulation system on the suction side of the fan 25 or 26, whereby the exhaust gas extracted from the drying chamber 3 is further combusted in the stationary zone 4 by a burner 27. This serves to heat the circulating hot gas. In this way, harmful substances contained in the exhaust gas from the dry zone 3, which are still present during incomplete combustion, are reliably removed. The exhaust air fan 30 functions to extract excess exhaust air from inside the fixed band 3.

After passing the fixed strip 4, the length of material 1 passes over two cooling rollers 31, 32 and is then wound onto roller 33. The length of textile material, which has not yet been dyed, lies on the roller 34 and runs from there towards the impregnation zone 2.

A temperature sensor (not shown) is located in the combustion chamber 8 of the drying chamber 3.
This temperature sensor cooperates with a fan connected to the exhaust gas pipe 29 to determine the air flow rate through the combustion chamber 8 in order to regulate the main temperature within the combustion chamber. If the temperature within the combustion chamber rises above the theoretical value, the air flow rate is increased and the temperature returns to the theoretical value.

A temperature sensor 36 is disposed outside the material inlet slot 35 of the stationary zone 4 to measure the temperature of the flowing air and is connected to the exhaust air fan 30 in order to regulate the main temperature within the stationary zone 4. connected to. If the temperature in the stationary zone 4 exceeds a predetermined theoretical value, the exhaust air fan 30 is activated to increase the amount of exhaust air.

A valve 37 is arranged in the exhaust gas pipe 29 connecting the drying zone 3 to the fixed zone 4. Yet another valve 38
is in the exhaust air pipe 39 which is connected to the exhaust gas pipe 29. These two valves 37, 38
are interlocked and driven in the opposite direction. When the device is being started, first valve 37 is closed and valve 38 is opened. Once the drying zone 3 reaches its preselected operating temperature after a short period of operation, valve 37 is opened and valve 38 is closed. The exhaust gas from the combustion chamber 8 of the drying zone 3 then passes into the stationary zone 4 where it is further combusted.

The first cylinder 19 of the fastening band 4 advantageously has a coating of plastic material, preferably of polytetrafluoroethylene, so that when the device is not assembled in an optimal manner, the length can be extended onto the first cylinder. to facilitate cleaning of these rollers in the event dye is wiped from the material.

The present invention will be explained in more detail with reference to the following example.

Polyester lining material (width 1.5m length 1m
(approximately 50g weight) in the dyeing zone for 40m/
It is applied at a speed of min. The dye solution consists of dye, water and 34% methanol by volume.

The applied material is then dried by combustion of methanol applied to the material in a drying zone, the length of material passes through a vertical drying section with a length of 1.6 m, and the material temperature is Maintained below 100℃. The residual moisture in the length of material is less than 1% when leaving the drying zone.

Immediately after leaving the drying zone, the length of material is continuously introduced at a constant rate into the stationary zone where it undergoes a thermosol process. Depending on the dye, the air temperature in the fixation zone is between 200 and 220°C. The residence period of the length of material in the fixing strip with 10 cylinders is about 26 s.

For uniform drying of dye within the dry zone,
There is no undesired dye diffusion in the fixation zone. On the contrary, a uniformly dyed material is obtained without uneven sides and without running on both sides.

By using the exhaust gas from the dry zone and further combusting it in the fixed zone, the gas consumption for heating the circulating air in the fixed zone is reduced.
7 cbm/h (compared to about 11 cbm/h of hot gas consumption without using exhaust gas from the dry zone). Also, the exhaust air released from the fixed belt is completely free of harmful substances.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for carrying out the method according to the present invention, FIGS. 1a and 1b are enlarged vertical cross-sectional views of the drying zone and fixed zone in FIG. 1, and FIG.
FIG. 2 is a partial cross-sectional view taken along line - in the figure. In the figure, 1 is a textile material of a certain length, 2 is an impregnation zone, 3 is a drying zone, 4 is a fixing zone, 7 is a retention zone,
8 is a combustion chamber, 9 is an ignition device, 13 is a heat radiation wall, 14
17 is an exhaust gas outlet opening, 17 is an intake opening, 18 is an air valve, 19 is a cylinder, 19a is a center line of the cylinder, 20, 21 are jet devices, 22 is a jet, 25, 26 are fans, 27 is a burner, 28 is a Grating, 29 is an exhaust gas pipe, 30 is an exhaust air fan, 31, 32 are cooling rollers, 33 is a take-up roller, 34 is a roller, 35 is an inlet slot, 36 is a temperature sensor, 37, 38 are valves, 39 is an exhaust air The pipes, E ₁ and E ₂ are horizontal planes, and T is the separation distance.

Claims (1)

Claims: 1. A method for dyeing and/or finishing, drying and fixing a length of textile material in a continuous process, the length of textile material comprising: (a) a dye and/or (b) a solution containing a finishing medium and any adjuvants and/or chemicals and a flammable organic fluid is first passed through an impregnation zone applied to the length of textile material; (c) then fixed by hot gas running over a number of cylinders in a fixed zone and using contact heat transfer between them and exhaust gases from the drying zone; (d) dyeing and/or finishing and drying a length of textile material in a continuous process, characterized in that the exhaust gases from the drying zone are further combusted in the fixing zone; and how to fix it. 2. A method for dyeing and/or finishing, drying and fixing a length of textile material according to claim 1 in a continuous process, in which a stream of hot gas heated by a burner circulates in the fixing zone. In a method for dyeing and dyeing a length of textile material in a continuous process, the waste gas from the drying zone is delivered to a burner for further combustion together with the recycled hot gas. /or methods of finishing, drying and fixing. 3. For dyeing and/or finishing, drying and fixing lengths of textile material in a continuous process: (a) dyes and/or finishing media and any auxiliary and/or chemical agents and flammable organic fluids; (b) is then dried in a drying zone by burnout of the organic fluid; (c) (d) in a method in which the exhaust gas from the drying zone is fixed by a hot gas running over a number of cylinders in a fixed zone and utilizing contact heat transfer therebetween and exhaust gas from the drying zone; Apparatus for dyeing and/or finishing, drying and fixing a length of textile material in a continuous process, carrying out the method, characterized in that it is further combusted in a continuous process. 4. In the apparatus for dyeing and/or finishing, drying and fixing in a continuous process a length of textile material as claimed in claim 3, the temperature sensor 36 is located outside the inlet or outlet slot 35 of the fixing strip 4. dyeing a length of textile material in a continuous process characterized in that it controls the general temperature within the fixation zone in cooperation with a fan 30 for exhaust air disposed in the fixation zone and extracted from the fixation zone; and/or finishing, drying and fixing equipment. 5. In the apparatus for dyeing and/or finishing, drying and fixing lengths of textile material in a continuous process as claimed in claim 3, the valve 37 connects the combustion chamber 8 of the drying zone 3 to the fixing zone 4. A valve 38 is disposed in the exhaust gas pipe 29 communicating with the combustion chamber 8, and a valve 38 is disposed in the exhaust air pipe 39 communicating with the combustion chamber 8, these two valves being actuated in conjunction and in opposite directions. Apparatus for dyeing and/or finishing, drying and fixing lengths of textile material in a continuous process, characterized in that: 6. A device for dyeing and/or finishing, drying and fixing in a continuous process a length of textile material according to claim 3, in which at least the first cylinder 19 of the fixing band 4 is made of plastic material. Apparatus for dyeing and/or finishing, drying and fixing lengths of textile material in a continuous process, characterized in that it has: 7. In the apparatus for dyeing and/or finishing, drying and fixing a certain length of textile material in a continuous process as described in claim 3, (a) the center line of the cylinder 19 in the fixing band 4 is vertically Contained in parallel on two horizontal planes E ₁ and E ₂ with a fixed distance T apart, and the center lines of each vertically adjacent cylinder are spaced apart in the horizontal direction by half (T/2) of the above fixed distance. (b) hot air jet devices (20 or 21) are respectively arranged on the two outer sides of said cylinder arrangement; (c) said jets 22 are in each case Apparatus for dyeing and/or finishing, drying and fixing a length of textile material in a continuous process, characterized in that it is arranged in the mid-plane area of adjacent cylinders and in the gap area between successive cylinders. 8. Apparatus for carrying out a process for dyeing and/or finishing, drying and fixing lengths of textile material in a continuous process, comprising: (a) dyes and/or finishing media and optional auxiliaries and/or chemicals; and (b) a solution containing a flammable organic fluid is first passed through an impregnation zone applied to the length of textile material, and (b) then dried in a drying zone by burning out the organic fluid. (c) then fixed by a hot gas running over a number of cylinders in a fixed zone and utilizing contact heat transfer therebetween and the exhaust gases from the drying zone; (d) the exhaust gases from the drying zone; is further combusted in the stationary zone, further in which hot gas heated by a burner circulates through the stationary zone, and the exhaust gas from the drying zone is combined with the circulating hot gas stream. In such a device, the exhaust gas pipe 29 of the drying zone 3 is sent to the burner.
a length of fabric, characterized in that it is open into the hot gas stream on the suction side of at least one fan 25, 26 arranged in the fastening band 4 and circulating the hot gas; Equipment for dyeing and/or finishing, drying and fixing materials in a continuous process.