GB2143865A

GB2143865A - Wet open-width treatment of continuous fabric

Info

Publication number: GB2143865A
Application number: GB08417287A
Authority: GB
Inventors: Max Stuhlmiller
Original assignee: Babcock Textilmaschinen GmbH
Current assignee: Babcock Textilmaschinen GmbH
Priority date: 1983-07-08
Filing date: 1984-07-06
Publication date: 1985-02-20
Also published as: IT8421793A0; DE3324650A1; IT8421793A1; IT1174580B; GB2143865B; GB8417287D0

Abstract

A plant for the wet open-width treatment of continuous fabric comprises a number of treatment devices (12, 19) in each of which a collector (13, 20) is connected to a recirculating pump (14) for delivering the treatment medium via pipelines (15, 21) to lances (16, 22) including nozzles. The treatment devices (12, 19) are interspersed with squeezing elements (18, 24, 25). <IMAGE>

Description

SPECIFICATION Wet Open-width Treatment of Continuous Fabric The invention concerns the wet open-width treatment of continuous fabric, especially for washing out water-soluble sizing, for washing out after boiling-off and bleaching processes, for washing after dyeing and printing and similar processes.

It is known that in similar processes the treatment dye solution is fed against the flow of the fabric run through the treatment, as for instance through individual treatment sections or alternatively through several treatment sections arranged in series. In each treatment section the fabric only comes into contact with the treatment dye solution once and the treatment effect is achieved during that period. Therefore, if a difficult fabric is being treated, a great number of treatment sections, i.e. even treatment devices if required, must be provided for the fabric to run through, or if the same number of treatment sections is used, there must be a greater amount of treatment medium, i.e. higher concentrations of the treatment medium used to achieve the desired effect.Both possibilities, i.e. increased use of materials or increased use of treatment medium are both elaborate and costly.

The invention at issue is therefore intended to solve the problem of achieving a better treatment effect without increasing the machinery required or the use of expensive chemicals.

According to one aspect of the invention there is provided a process for the wet open-width treatment of continuous fabric, especially after washing out water-soluble sizing, for washing out after boiling-off and bleaching processes, for post-dyeing and post-printing washes and similar processes, wherein the treatment dye solution used for one treatment section is collected after the treatment and again fed through the same treatment section, and is only then drawn off or diverted to the next treatment section.

The repeated reintroduction of the treatment dye solution after the treatment process into the same treatment section has proved effective with this method.

According to another aspect of the invention there is provided a device for carrying out the above process, wherein the dye solution collector of one treatment section is connected to a recirculating pump through which nozzles, positioned above pipelines and lances can re-feed the treatment dye solution collected in the container to the fabric being treated in that section.

In order to ensure the effectiveness of such a process, there is a self-cleaning dirt filter positioned between the dye solution collector and the recirculating pump.

Where the treatment section is designed for vertically guided fabric, there should preferably be two lances with nozzles at both sides of the first section of cloth running upwards, and two further lances above the last two upper rolls of the section. It has proved to be effective for the treatment section to be provided with indirect heating.

Where the treatment section is designed for horizontally guided fabric, it is advisable to locate the lances with the nozzles near the three lower redirecting rolls for the fabric. It is also effective here to provide this treatment section with a fixture for the dosed addition of chemicals, soap or similar products positioned in a dipping vat of the treatment section. The dosed addition of chemicals, soap and similar products should be dependent upon the quantity of treatment dye solution used in the complete treatment.

According to a further aspect of the invention there is provided plant comprising devices as above, wherein in the fabric run for a washing treatment, between an inlet device and an outlet device, there are, in the direction of the cloth run, one after another a washing compartment for vertically guided cloth with a two-circuit washing dye solution guideway, a squeezing element, a washing section for horizontally guided cloth with a two-circuit washing dye solution guideway, a further squeezing element, a further washing compartment for vertically guided cloth with a two-circuit washing dye solution guideway, a further squeezing element, an acid vat and a further squeezing element.

The invention can be further explained with the use of examples and with reference to the attached drawing.

The plant shown in the drawing consists of tree treatment sections 12, 1 9 and an acid vat 26. The first section is a washing compartment 12 with e.g. 11 metres cloth content. It can be operated in complete counterflow as a washing machine or an impregnation compartment. The compartment is, as can be seen from the drawing, also equipped with four rows of lances 1 6 with spray nozzles, the first two of which are arranged at an angle against one another, thereby spraying the first vertically guided fabric 10 from both sides.

The other two rows are arranged above the last two upper rolls 1 7. The lances 1 6 are fed via a self-cleaning filter from a recirculating pump 14 with dye solution from the compartment. A two circuit system is therefore in operation here, i.e.

with normal counterflow and with additional recirculation. It is possible for the quantity of the recirculated water here to amount to 8 times the amount of the water in the counterflow.

The second treatment section 1 9 is a section with horizontal water guidance. Here also there is provision for a two-circuit system. The lances 22 are arranged near the three lower redirecting rolls 23. The recirculated volume of water can amount to 5 times that carried in the counterflow. The clean water from the counterflow is pumped into the upper vat 28, the recirculated water from the ground tub 20 is pumped via a self-cleaning filter into the lances 22. This combined system achieves an excellent washing effect while at the same time having low-tension fabric guidance. In addition, this treatment section is equipped with a dosing fixture for the addition of soap. This is added in the middle vat 28 of this treatment section. The required dose of chemicals is gauged in accordance with the amount of water used in the counterflow.

The third treatment section 12 is equipped like the first treatment section 12, but can only be operated in a counterflow as a washing compartment.

All recirculating devices 14 can be quantitycontrolled. The two treatment sections 12 with vertically guided fabric 10 are equipped with indirect heating. At the end of the plant there is an acid vat 26, positioned between two final squeezing elements 25, in order to neutralize the cloth. The plant can be supplied with, e.g. warm water (500 C) from the works supply. If the temperature in treatment section 1 9 is to be increased to 800 C, then a heat exchanger built into the circuit and fed at the intake end with hot pressurized water at 12 bar, 1 700 C, is switched on.

Example 1 Greige cloth intended for piece dyeing, is intensively impregnated in section 12 with a surface active agent at 500C. After this, there is intensive soaping in section 1 9 in the area of the recirculating system up to 800 C, and in the upper region and in the second section 12, rinsing takes place. This section 1 2 is again operated with water at 500C. The sections 12 and 19 are operated in countercurrent. There is no addition of chemicals in the vat.

Example 2 Colour-woven cloth, which can be, depending on the quality, previously singed (denapped), is rinsed in section 12 without surface active agents at 500 C, washed with soap in section 1 9 in the lower region at 500C and subsequently rinsed in the upper region and in the further section 12 at the same temperature. In the acid vat, the cloth is acidified to approx. pH (isoelectric point of wool) with acetic acid. Section 12 and 1 9 are operated in countercurrent.

Claims

1. Process for the wet open-width treatment of continuous fabric, especially for washing out water-soluble sizing, for washing out after boilingoff and bleaching processes, for post-dyeing and post-printing washes and similar processes, wherein the treatment dye solution used for one treatment section is collected after the treatment and again fed through the same treatment section, and is only then drawn off or diverted to the next treatment section.

2. Process according to claim 1, wherein the refeeding of the treatment dye solution to the same treatment section is carried out repeatedly after the treatment process.

3. A device for carrying out the process according to claim 1 or 2, wherein the dye solution collector of one treatment section is connected to a recirculating pump, through which nozzles, positioned above pipelines and lances can re-feed the treatment dye solution collected in the container to the fabric being treated in that section.

4. A device according to claim 3, wherein it is fitted with a self-cleaning dirt filter between the dye solution collector and the recirculating pump.

5. A device according to claim 3 or 4, wherein where the treatment section is designed for a vertical fabric run, the lances with the nozzles are so arranged that there are two lances at both sides of the first section of the fabric running upwards, and two further lances above the last two upper rolls.

6. A device according to claim 5, wherein the treatment section is provided with indirect heating.

7. A device according to claim 3 or 4, wherein where the treatment section is designed for the horizontal guidance of the fabric, the lances with the nozzles are arranged near the three lower redirecting rolls for the fabric.

8. A device according to claim 7, wherein the treatment section is provided with a fixture for the dosed addition of chemicals, soap or similar products, positioned in a dipping vat of the treatment section.

9. A device according to claim 8, wherein the dosed addition of chemicals, soap and similar products is dependent upon the quantity of treatment dye solution used in the overall treatment.

10. Plant comprising devices according to any one of claims 3 to 9 wherein the fabric run for a washing treatment, between an inlet device and an outlet device there are, in the direction of the cloth run, one after another a washing compartment for vertically guided cloth with a two-circuit washing dye solution guideway, a squeezing element, a washing section for horizontally guided cloth with a two-circuit washing dye solution guideway, a further squeezing element, a further washing compartment for vertically guided cloth with a two-circuit washing dye solution guideway, a further squeezing element, an acid vat and a further squeezing element.

11. Process for the wet open-width treatment of continuous fabric, substantially as hereinbefore described in example 1 or 2 and with reference to the accompanying drawing.

1 2. A device for the wet open-width treatment of continuous fabric, substantially as hereinbefore described with reference to the accompanying drawing.

1 3. Plant for the wet-open width treatment of continuous fabric, substantially as hereinbefore described with reference to the accompanying drawing.