DE69733765T2 - METHOD AND DEVICE FOR HEAT TREATMENT OF TEXTILES - Google Patents

Abstract

Textiles, e.g. cops of spun cotton yarn, are heat treated in steamer 6 by:- evacuating the steamer using pump 2; admitting liquid, e.g. water, into steamer bath 8 from tank 19; heating the bath to form steam for a preselected time; and pumping the liquid back into tank 19 for reuse. The treatment may be repeated with liquid from chemical tank 20, and then with liquid wax from tank 21. The steamer is then evacuated, and the textile cooled and dried. The first vacuum is at least 1000 mbar absolute. The process reduces recondensation and energy losses.

Description

The The present invention relates to a method of heat treatment of textiles, in particular spun cops or spools, in a heated damper, which over Valves with a water and / or chemical supply and a Vacuum pump is connected, as well as to a device for carrying out the Process.

Under "textiles" are any Structures understood from textile raw materials, which both from fibrous as well as from flat Structures present.

It It is known that a heat treatment is advantageous Effects for the further processing of yarns etc. results.

Also can Textiles by a treatment in a vapor phase, possibly under Addition of chemicals, conditioned or refined.

suitable damper have been known for many years and consist essentially of a cylindrical vessel with a hinged lid. At the inside of the damper there is a water bath; by means of a heating device Steam generated and thus the appropriate heat treatment of the introduced Material causes. To prevent the penetration of steam into the interior of the To improve textiles, a vacuum is created before the heating for the Water bath is turned on.

These known damper have the disadvantage that much energy for the production and maintenance of the vacuum needed and that also the steam is sucked by the vacuum pump and must be condensed. This will only be a limited intrusion reaches the vapor of the material to be treated and / or it result in long treatment times.

It It is an object of the invention to provide a method and a device create, which uses less energy, a better penetration of the steam allowed in the material to be treated and also the Cycle times and the entire heat treatment to reduce. This object is achieved by the in claims 1 and 9 identified technical features solved.

Preferably In the second step, a vacuum of at least 50 mbar is generated.

For a liquid bath With 300 liters, the method described saves energy of 12 kWh per cycle or 35 to 40 kWh for one treatment. In addition, this must be during the evacuation from the damper do not return pumped water be condensed. The non-condensed volume corresponds approximately 20 liters per treatment cycle.

from that results in the further advantage that the necessary amount of fresh water, by the inventive Recirculation of the liquid, too by an order of magnitude reduced.

One Another advantage is the simple and economical supply of Chemicals and / or finishing additives which the vacuum pump not or only very slightly burden.

The heat treatment or the results achieved can be improved in a simple way be the second to sixth step at least once be repeated.

The Treatment can be optimized by successively increasing the treatment Temperatures of the vapor phases from the first to the at least following Heat treatment cycle.

During the heat treatment is preferably a saturated steam temperature of at least 350 K. while of the first cycle and set at least 380 K during further cycles.

By the increase in the residence time, at constant temperature, the Results can be improved without increasing the energy consumption.

In addition, can by ventilation Energy saved and as a result the total treatment time is shortened, for example, by interrupting and rebuilding the vacuum the end of the first heat treatment.

Preferably water and / or chemicals are fed from storage tanks, their volumes are matched to the volume of the liquid bath and the, along with the damper form a closed system in which only the loss share of the liquid fed from outside is determined by the residual moisture of the material to be treated and by the evacuation arises. This will cause a return of the liquid allows and subsequently an economic one and environmentally friendly process.

The invention further provides an apparatus for carrying out the above method consisting of a heated damper connected via valves connected to a water and / or chemical supply and a vacuum pump, which with at least one container, a pump and with at least two valves are equipped for the supply of liquid and / or chemicals; The valves regulate the supply of liquid to the damper and drain.

Preferably is an electric heater at least within the liquid bath in the damper built-in. Such an electric heater is particularly advantageous because it can be controlled very flexibly and thus achieves a favorable effect. Other heating systems, for example hot steam, can also be used economically will be available depending on Energy sources.

The Vacuum pump is preferably a water ring pump or a rotary vane pump. A Water ring pump is very cost effective and reaches a vacuum up to about 30 mbar. For a vacuum up to 5 mbar is a rotary vane pump necessary.

below For example, a device according to the invention will be described with reference to the associated Drawings:

1 is a simplified, schematic representation of the damper for the treatment of yarn clots according to the invention,

2 shows a characteristic temperature profile for the vapor phase in the damper according to 1 and

3 shows the from the temperature in 2 resulting pressure curve in the damper, relative to the ambient atmosphere.

In 1 is a purging line with the reference 1 designated. A vacuum pump 2 with an electric motor M is with the purging line 1 connected. A vacuum line 3 is with the input side of the vacuum pump 2 (a rotary vane pump) and communicates via the valve V1 and the suction line 4 with the interior of the damper 6 ,

Another valve V2 in the suction line 4 connects them to the outside air supply line 5 ,

Within the known per se damper 6 is a liquid bath 8th and an electric heater 10 arranged; the aqueous liquid 9 can reach a level N1.

At one end is the damper 6 with one around the vertical axis 7a swiveling lid 7 Mistake. The material G to be treated is opened by opening the lid 7 in the damper 6 introduced where it is steamed.

supply lines 11 lead by the electric heater 10 to the control unit whose control function is indicated by +/-.

A fluid line 12 flows into the damper 6 and is connected to the pump line 13 and with the supply line 22 ,

The pump line 13 passes through the valve V3, a liquid pump 14 with electric drive motor M and the pressure lines 15 to the valves V7, V8 and V9. The valves V7-V9 are in turn on the filling and discharge lines 16 - 18 with the lower part of the liquid reservoir 19 - 21 connected. Each of these reservoirs (tanks) is equipped with a vent line 19 ' - 21 ' Mistake.

The valves V4-V6 are also with the filling and discharge lines 16 - 18 as well as with supply lines 22 connected.

The operation of the device after 1 is relatively simple: the inside of the damper 6 is via the vacuum line 3 and the purging line 1 evacuated by closing valve V2, opening valve V3 and activating the vacuum pump 2 , As a result, the material G to be treated is substantially deaerated.

The valve V4 of the water tank 19 will be opened now; the valve V9 remains closed, allowing the water through the supply line 22 and the fluid line 12 is sucked into the damper, where it is the water bath 8th fills up to level N1. The valve 4 is then closed and at the same time the heating 10 activated by switching on the supply voltage; as a result, inside the damper 6 a vapor phase is built up and saturated vapor permeates the material G.

After a predetermined treatment time, the heating 10 switched off by the controller, the valves V3 and V9 are opened, the valve V4 remains closed and the liquid pump 14 is turned on; the water gets into the water tank 19 pumped back and reached about the level N2. The displaced air is via the vent line 19 ' directed to the outside.

The acids or bases are similarly removed from the reservoir 20 in the damper 6 guided and pumped back.

Another advantage of this device is the connection with the liquid wax reservoir 21 after the last steaming process to facilitate further processing for the material G, namely spun yarn in the form of yarn packages.

The 2 and 3 show the applied characteristics of the heat treatment in practice Development of yarn packages, starting from an ambient pressure of 1000 mbar. For scaling reasons, the negative pressures are in 3 shown on a shortened scale.

As in 3 shown, the damper 6 evacuated to a pressure of 5 mbar, then water from the water tank 19 fed and heated and a vapor phase of about 350 K generated and maintained for about 2 minutes; compare 2 , During this process, the pressure in the damper turns 6 at about 420 mbar.

Thereafter, the vacuum is interrupted and a residual amount of water vapor is passed through the suction line 4 and vent the valve V2 to the atmosphere; compare 1 ,

As in 3 is shown again, then a vacuum of 5 mbar is produced and a second treatment cycle begins. In this case, the temperature of the vapor phase is increased to 380 K; the (over) pressure rises during this warming of the from the chemical tank 20 supplied liquid to 1300 mbar.

The same happens in the third cycle, during which an aqueous wax solution from the liquid wax tank 21 for the formation of the liquid bath 8th is used.

It has in the sense of optimizing this heat treatment as very beneficial proved the temperatures and duration of subsequent treatment cycles increase compared to the first cycle.

Of the first cycle 1.C starts after the first evacuation 1.V and lasts 3.0 minutes; the second and third cycles 2.C and 3.C each have one Duration of 4.0 minutes. The whole heat treatment is after the fourth evacuation ended 4.V, while the residual moisture out the material is removed. The one used in this treatment Material is spun yarn of cotton; the cops have one Net weight of 120 g.

Like from the 2 and 3 It can be seen that the entire treatment, including the wax treatment of the yarn, lasts only 18.5 minutes despite the size of the cops.

Depending on the material to be treated and the process cycles selected for it may be advantageous for economic reasons, in addition to a steam condenser after the vacuum pump 2 to install.

Of the Treatment process can also be performed with vacuum above 50 mbar. However, the treatment duration is increased and the quality of the treatment reduced, especially when pressed the material to be treated and / or hard.

Claims (11)

Process for the heat treatment of textiles (G) in a heated damper ( 6 ), which has valves (V4-V9) and a pump ( 14 ), with a valve (V3) with a water and / or chemical supply ( 19 - 21 ) and via valves (V1, V2) with a vacuum pump ( 2 ), wherein: in a first step, the damper ( 6 ) is loaded with the material (G) to be treated, followed by several subsequent steps of evacuating the air, exposing the fabric (G) for a predetermined time in a vapor phase, cooling, drying, evacuating again and finally removing the fabrics (G) the damper ( 6 ), characterized in that: - in a second step, the vacuum pump ( 2 ) is turned on until in the damper ( 6 ) an absolute pressure of at least 100 mbar is reached, - in a third step, a feed valve (V7-V9) of the water and / or chemical supply ( 19 - 21 ) is opened and a predetermined amount of liquid is passed into the damper to a liquid bath ( 9 ), in a fourth step the liquid bath ( 9 ) and the vapor phase to be formed by a built-in heating element ( 10 ) are heated to a predetermined temperature, - the material to be treated (G) is held for a predetermined time in the saturated steam phase and then the liquid from the damper ( 6 ) in the reservoir ( 19 - 21 ) is pumped back, - in a fifth step, the vacuum pump ( 2 ) is activated again, - in a sixth step, after preselected evacuation, cooling and drying time, the vacuum pump ( 2 ) is turned off and ambient air into the damper ( 6 ), and - in the last step, the material (G) again from the damper ( 6 ) is taken out. The method of claim 1, wherein in the second Step generated vacuum is at least 50 mbar. Method according to claim 1 or 2, wherein the steps be repeated two to six at least once. A method according to claim 2 or 3, wherein the temperatures the vapor phase from the first to at least one subsequent one Heat treatment can be increased. The method of claim 4, wherein the Steam temperature during the heat treatment in the first cycle is at least 350 K and at least 380 K in another cycle. Method according to claim 4 or 5, wherein the time with constant temperature during the first treatment cycle shorter is as while the subsequent heat treatments. Method according to one of claims 4 to 6, wherein in a Intermediate step before the end of the first treatment cycle the vacuum is interrupted and rebuilt. Method according to one of the preceding claims, in the water and / or chemicals according to the volume of the to be formed liquid bath in the damper sized storage containers supplied and together with the damper a closed system form, which only by the residual moisture of the material and the evacuated amount of steam lost amount of liquid from the outside again supplied become. Apparatus for carrying out the method according to one of the preceding claims including a heated damper connected via Valves with a water and / or chemicals supply and a Vacuum pump, the at least one container, a pump and at least two valves for the liquid and / or chemicals supply having, wherein the valves the supply and disposal of the liquid to and from the damper regulate. Apparatus according to claim 9, wherein an electrical Heating element is installed, which is at least in the space of the liquid bath inside the damper located. Apparatus according to claim 9 or 10, wherein the Vacuum pump is a water ring pump or a rotary vane pump.