Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
  • D06B21/00—Successive treatments of textile materials by liquids, gases or vapours
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
  • D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
  • D06B3/10—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics
  • D06B3/20—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating of fabrics with means to improve the circulation of the treating material on the surface of the fabric

Definitions

• the invention relates to a continuous process for bleaching a textile web and a corresponding machine system.
• a bleaching liquor which contains, for example, sodium hydroxide solution and peroxide and which acts in a damper on the fabric for a certain dwell time, is applied to a textile fabric web consisting entirely or predominantly of cotton. Subsequently, the fabric is freed of the applied chemicals and the dissolved substances in an intensive wash and is then ready for the dyeing process.
• this standard method results in a good degree of whiteness and freedom from shells, but the hydrophilicity sometimes leaves something to be desired, which means that the fabric web does not greedily accept the dyeing liquor.
• the hydrophilicity is determined by how much of the waxes and fats on the cotton fiber could be dissolved by the treatment with NaOH. If this solution is not completely complete and some of the waxes and fats remain on the web, the hydrophilicity is poor and the dyeing liquid is correspondingly poorly accepted.
• the washing device consists of several individual washing machines arranged one behind the other, which are designed, for example, as roller skids. Such a series of washing machines is operated for reasons of economy in the known embodiments in countercurrent, i.e. the fresh water is added at the end of the row and flows from one washing machine to the other in the direction of web travel, in order to be directed "into the channel" at the last washing machine in the flow direction and the first web direction.
• the object of the invention is to improve the treatment result with regard to the hydrophilic properties of the web in a generic method or such a system.
• used washing liquor is not discharged immediately at the beginning of the washing machine section, but only at a later point in time in the sense of the direction of travel of the web, namely at the boundary between the direct current section and the countercurrent section.
• the invention includes that the total amount of the portion at the end of the counter current portion used washing liquid is used at the beginning of the DC section, ie immediately after the damper. However, it is preferred to use only a subset of the total amount of washing liquid used in the countercurrent section at the beginning of the direct current section.
• the combined effect of these measures is that the residual chemicals on the web are not rinsed off with a large supply of washing liquid and immediately drained off, but that the residual chemicals are only exposed to a reduced washing attack and have the opportunity to have an after-effect in the direct current section.
• the inventive design of the washing device consisting of several washing machines thus artificially extends the exposure time of the residual chemicals, in particular the chemicals relevant for the solution of the waxes and fats, in particular the sodium hydroxide solution, so that the detachment of these waxes and fats is improved accordingly and good hydrophilic properties are established.
• the previously usual brewing stage with NaOH which precedes the bleaching stage with peroxide, can be dispensed with, and real one-stage bleaching can be achieved by applying NaOH and peroxide together with a somewhat increased NaOH concentration and thus passing the web through the damper is driven.
• the saving of the brewing stage after which the NaOH had to be washed out again which is mostly possible according to the invention by the mere design of the washing process, also represents an important advantage from the point of view of reducing the environmental impact Amount of NaOH required to dissolve the waxes and fats and placed together with the peroxide in a treatment liquor, but NaOH is also present in the bleach liquor if there is a brewing stage.
• the total exposure to NaOH is, however, at one possible elimination of the brewing level is lower.
• the bleaching with NaOH and peroxide corresponds to the preferred application of the invention, but this is not restricted to this.
• the washing liquor is therefore already partially used and contains the washed-out residual chemicals, which is used in the direct current section, so that the web is treated there to a certain extent "in its own juice” and the residual chemicals in the washing liquor contain the opportunity to influence the hydrophilicity to have further influence on the web after leaving the damper.
• Claims 3 and 4 reflect the apparatus configuration of the continuous system according to the invention.
• the fabric web 10 is first prewashed intensively and then provided with a bleaching liquor which can contain, for example, sodium hydroxide solution and peroxide.
• a bleaching liquor which can contain, for example, sodium hydroxide solution and peroxide.
• the thus loaded goods 10 then has a dwell time brought behind in a damper 1, the end region is shown on the left side of the drawing.
• the damper is followed by a washing device designated as a whole by 2.
• the material web 10 then runs through a sink 3 and a roller crusher 4 and is finally wound up into a dock 5.
• the washing device 2 consists of four washing machines 6, 7, 8, 9 connected in series in the direction of travel of the web 10, which are designed as so-called roller runners and in turn are each divided into four washing compartments, as is the case with the Washing machine 6 is indicated by the reference numbers 6 .., 6 2 , 6., And 6-.
• the fresh water is fed via line 11 and a filter 11 'to a pump 13, which pumps it via a control valve 14 and a heat exchanger 15 at 16 into the last washing machine at the very end of the row of washing machines 6, 7, 8, 9 9 initiates.
• the fresh water forms at the bottom of the washing machines 6, 7, 8, 9 a washing liquor which flows in the washing machines 9 and 8 against the direction of travel of the web 10 indicated by the arrows and in the manner shown in the drawing from the washing machine 9 flows into the washing machine 8 in order to be drawn off via the line 17 into an intermediate container 18 at the entrance of the washing machine 8 (seen in the direction of travel of the product web 10), from which overflowing washing liquor via the line 19 into the heat exchanger 15 and from this into the "Channel" 20 arrives.
• the wash liquor is heated in the washing machines 6, 7, 8, 9 and has an elevated temperature. The heat is transferred in the heat exchanger 15 to the fresh water added.
• a portion of the wash liquor which has entered the intermediate container 18 is pumped via the pump 21 and the control valve 22 and the line 23 at the inlet 27 (in the direction of flow of the Material web 10 seen) of the washing machine 6, that is, at a point immediately following the damper 1, entered and flows through the washing machine 6 and then through the washing machine 7, in order to be discharged either directly into the channel or via the line at its outlet 28
• the web 10 therefore remains in the first washing machines 6, 7 in a washing liquor which has already been partially used up, flows in accordance with the running direction of the web 10 and only goes into the channel 20 at the outlet 28 of the washing machine 7. In the washing machines 6, 7, the web 10 is therefore not immediately thoroughly rinsed out, but the bleaching liquor remaining on the web 10 has the opportunity to act. In the intermediate section given by the washing machines 6, 7 there is a transition from a liquor ratio of approximately 1: 1 in the damper 1 to a liquor ratio of approximately 1: 2 to
• the amount of wash liquor removed from the intermediate container 18 by the pump 21 is 10% to 50% of the wash liquor passed through the washing machines 8.9.
• the entire washing device 2 is thus in a direct current section immediately following the damper 1

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Treatment Of Fiber Materials (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6400970

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (1)

Citations (7)

• 1990
  • 1990-02-26 DE DE4005979A patent/DE4005979A1/de active Granted
• 1991
  • 1991-02-08 ES ES91903274T patent/ES2071298T3/es not_active Expired - Lifetime
  • 1991-02-08 BR BR919105859A patent/BR9105859A/pt not_active IP Right Cessation
  • 1991-02-08 DE DE59105397T patent/DE59105397D1/de not_active Expired - Fee Related
  • 1991-02-08 EP EP91903274A patent/EP0517711B1/de not_active Expired - Lifetime
  • 1991-02-08 JP JP3503656A patent/JPH0672358B2/ja not_active Expired - Lifetime
  • 1991-02-08 WO PCT/DE1991/000102 patent/WO1991013199A1/de active IP Right Grant

Patent Citations (7)

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