GB2108165A

GB2108165A - Impregnating textile webs

Info

Publication number: GB2108165A
Application number: GB08230681A
Authority: GB
Inventors: Claus Tischbein; Ulrich Burkhardt
Original assignee: Babcock Textilmaschinen GmbH
Current assignee: Babcock Textilmaschinen GmbH
Priority date: 1981-10-29
Filing date: 1982-10-27
Publication date: 1983-05-11
Also published as: NL8204203A; IT8224009A0; GB2108165B; FR2515710A1; FR2515710B1; DE3142958A1; IT1191062B

Abstract

Travelling runs of cloth, such as textile webs, textile-like webs or the like, are heated up and impregnated agents are then applied thereto in foamed form as foam films or runs of foam. The impregnating agents may be finishing agents, or chemical products, or dyestuffs.

Description

SPECIFICATION Method of impregnating travelling runs of cloth by means of foamed impregnating agents The invention relates to a method of impregnating travelling runs of cloth, such as textile webs, textile-like webs or the like, and refers more especially to the application of impregnating agent in foamed foam to the runs of cloth.

In order to keep the consumption of energy low in the case of the wet treatment of runs of cloth, which energy consumption results from the drying generally necessary after the wet treatment, the application of the impregnating agents such as finishing agents, chemical products, dyestuffs or the like has been carried out in recent times at low humidity in the form of impregnating agent foams.

In order that the collapsing of the foams on the runs of cloth is more rapid and hence the delivery of liquid thereto is rapid, only foams which are stable for a relatively short time have hitherto been employed. With this practice, however, considerable difficulties have frequently arisen owing to the erratic collapsing of these foams on the runs of cloth entailing spot formations and markings. Moreover, with the methods known hitherto the penetration into the runs of cloth of the liquid yielded from the foams is poor.

Objects of the present invention are to obviate of mitigate these disadvantages and more especially to solve the problem of making possible the use of stable and reliably controllable foams, that attainment of a purposeful collapsing of the foams on the runs of cloth, and particularly the ensurance of efficient penetration into the runs of cloth of the liquid yielded from the foams.

In accordance with the present invention a method of impregnating travelling runs of cloth, such as textile webs, textile-like webs or the like comprising heating up the runs of cloth prior to the application thereto of the impregnating agents, and not till then applying on to the heated-up runs of cloth the impregnating agents finishing agents, chemical products or dyestuffs in foamed form as foam films or runs of foam.

The impregnating agents may be finishing agents, chemical products or dyestuffs.

In the case of a preferred embodiment of the invention the application of the foam films or runs on to the heated runs of cloth is carried out only after formation of the films or runs is accomplished and at some spacing forward of the formation station. The quantities of the foams supplied in foam applicatory devices may in so doing be intended for films of about 0.5 to 5 mm thickness, the foam films or runs being delivered in the first instance, for example, on to an applicatory roll which then carries it to the hot runs of cloth.

By these means the quantitative supplying and foam film forming are separated from the collapsing of the foam on the run of cloth and can thus be reliably controlled.

The heating-up of the runs of cloth is preferably carried out at such an intensity that steam is developed from the moisture or residual moisture contained in the runs of cloth and is retained until the impregnating agent foam is applied. The steam formed in the run of cloth owing to the heating up of the cloth is condensed, when this is done, due to transfer of heat to the foam, whereby a vacuum is formed through which the foam or rather the liquid emanating from the foam is sucked into the run of cloth and penetrates deeply into the latter.

It has been shown to be advantageous, with runs of cloth which are wet in the initial state, to dry same to a standard propitious for the absorption of the impregnating agent foam, about 35 to 40% in the case of cellulose fibres, at least the final part of the drying treatment being carried out in a medium with high steam content. With runs of cloth which are dry in the initial state, the heating up of the runs of cloth should preferably take place by means of steam at ambient pressure.

In order to ensure heating up to the very depths of the associated yarns or fibres of the run of cloth, the heating up of the runs of cloth is preferably carried out by blowing or sucking steam through the runs of cloth.

The purposeful collapsing of the foam on the runs of cloth may be further assisted by subjecting the runs of cloth, after application of the impregnating agent foam, to a further heat treatment, for example in a steam space.

1. A method of impregnating travelling runs of cloth, such as textile webs, textile-like webs or the like, comprising heating up the runs of cloth prior to the application of the impregnating agents and then applying the impregnating agents to the runs of cloth in foamed form as foam films or runs of foam.

2. A method according to claim 1, in which the impregnating agents are finishing agents.

3. A method according to claim 1, in which the impregnating agents are chemical products.

4. A method according to claim 1, in which the impregnating agents are dyestuffs.

5. A method according to any one of the preceding claims, comprising applying the foam films or runs of foam on to the heated runs of cloth only after formation of the films or runs is accomplished and at some spacing forward of the formation station.

6. A method according to any one of the preceding claims, comprising heating up the runs of cloth at such an intensity that steam is

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of impregnating travelling runs of cloth by means of foamed impregnating agents The invention relates to a method of impregnating travelling runs of cloth, such as textile webs, textile-like webs or the like, and refers more especially to the application of impregnating agent in foamed foam to the runs of cloth. In order to keep the consumption of energy low in the case of the wet treatment of runs of cloth, which energy consumption results from the drying generally necessary after the wet treatment, the application of the impregnating agents such as finishing agents, chemical products, dyestuffs or the like has been carried out in recent times at low humidity in the form of impregnating agent foams. In order that the collapsing of the foams on the runs of cloth is more rapid and hence the delivery of liquid thereto is rapid, only foams which are stable for a relatively short time have hitherto been employed. With this practice, however, considerable difficulties have frequently arisen owing to the erratic collapsing of these foams on the runs of cloth entailing spot formations and markings. Moreover, with the methods known hitherto the penetration into the runs of cloth of the liquid yielded from the foams is poor. Objects of the present invention are to obviate of mitigate these disadvantages and more especially to solve the problem of making possible the use of stable and reliably controllable foams, that attainment of a purposeful collapsing of the foams on the runs of cloth, and particularly the ensurance of efficient penetration into the runs of cloth of the liquid yielded from the foams. In accordance with the present invention a method of impregnating travelling runs of cloth, such as textile webs, textile-like webs or the like comprising heating up the runs of cloth prior to the application thereto of the impregnating agents, and not till then applying on to the heated-up runs of cloth the impregnating agents finishing agents, chemical products or dyestuffs in foamed form as foam films or runs of foam. The impregnating agents may be finishing agents, chemical products or dyestuffs. In the case of a preferred embodiment of the invention the application of the foam films or runs on to the heated runs of cloth is carried out only after formation of the films or runs is accomplished and at some spacing forward of the formation station. The quantities of the foams supplied in foam applicatory devices may in so doing be intended for films of about 0.5 to 5 mm thickness, the foam films or runs being delivered in the first instance, for example, on to an applicatory roll which then carries it to the hot runs of cloth. By these means the quantitative supplying and foam film forming are separated from the collapsing of the foam on the run of cloth and can thus be reliably controlled. The heating-up of the runs of cloth is preferably carried out at such an intensity that steam is developed from the moisture or residual moisture contained in the runs of cloth and is retained until the impregnating agent foam is applied. The steam formed in the run of cloth owing to the heating up of the cloth is condensed, when this is done, due to transfer of heat to the foam, whereby a vacuum is formed through which the foam or rather the liquid emanating from the foam is sucked into the run of cloth and penetrates deeply into the latter. It has been shown to be advantageous, with runs of cloth which are wet in the initial state, to dry same to a standard propitious for the absorption of the impregnating agent foam, about 35 to 40% in the case of cellulose fibres, at least the final part of the drying treatment being carried out in a medium with high steam content. With runs of cloth which are dry in the initial state, the heating up of the runs of cloth should preferably take place by means of steam at ambient pressure. In order to ensure heating up to the very depths of the associated yarns or fibres of the run of cloth, the heating up of the runs of cloth is preferably carried out by blowing or sucking steam through the runs of cloth. The purposeful collapsing of the foam on the runs of cloth may be further assisted by subjecting the runs of cloth, after application of the impregnating agent foam, to a further heat treatment, for example in a steam space. CLAIMS

6. A method according to any one of the preceding claims, comprising heating up the runs of cloth at such an intensity that steam is developed from the moisture contained in the runs of cloth and is retained until the impregnating agent foam is applied.

7. A method according to any one of the preceding claims, in which, with runs of cloth wet in the initial state, the runs of cloth are dried to a standard propitious for the adsorption of the impregnating agent foam, and at least the final part of the drying treatment is carried out in a medium with high steam content.

8. A method according to any one of claims 1 to 6, in which, with runs of cloth dry in the initial state, heating up of the runs of cloth takes place by means of steam at ambient pressure.

9. A method according to any one of claims 1 to 8, comprising heating up the runs of cloth by blowing or sucking steam through the runs of cloth.

10. A method according to any one of claims 1 to 5, in which the runs of cloth, after the application of the impregnating agent foam, are subjected to a further heat treatment.

11. A method according to claim 10, in which the further heat treatment is carried out in a steam space.