Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Combined liquid and gas or vapor
Patent
1991-05-02
1993-08-10
Coe, Philip R.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Combined liquid and gas or vapor
8151, 68 5E, 68181R, 68205R, D06B 312
Patent
active
052337170
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a method of treatment of a material web, in particular a fabric web. These types of treatment methods are employed especially when washing the fabric web in order to remove the remains of dyes, size and other treatment mediums. The method could also be employed for other purposes apart from cleaning of the fabric web, for example for impregnation or similar. The invention also concerns a suitable device for carrying out the method.
Related and comparable methods are already known, respectively devices with which washing water is sprayed onto the fabric web out of an arrangement of nozzles which extends over its entire width. For example, EP-A-43 083 shows a device for washing longer webs with which an arrangement of washing nozzles, comprising a box shaped body, is provided on each side of the fabric web at a mutual distance. The nozzles, together with the fabric web to be washed, form chamber-like recesses, so that the web can be treated very intensively with fresh water. In DE-A-14 60 174 a method and a device for continuous wet treatment of fabric material webs with liquids is described. In order to achieve a high degree of effectiveness with as small an amount of liquor as possible, the web is transported through two interconnecting chambers, whereby a high flow speed in the chambers is aimed at, since liquor is drawn-off by means of a pump from one chamber and is fed into the other chamber with high speed through a tangential nozzle.
As a rule, the known methods and devices are only concerned with how a liquid treatment medium can be applied to the material web in an especially effective way, respectively how it can be removed again. Until now, insufficient attention has been payed to the economical use of water and the problem of disposal of waste. So, for example, the degree of washing effectiveness is to a considerable extent a function of the amount of water supplied per kilogram of product. Until now a considerable amount of water has had to be employed in order to achieve the desired degree of effectiveness. Fresh water, however, causes high costs to an increasing degree, whereby the problem of purification of the soiled water must also be considered.
It is therefore a purpose of the invention to create a method of the type mentioned in the introduction with which a higher degree of treatment effectiveness is achieved with the most economical use of the treatment medium possible, and with which especially a fabric web can be washed with a small supply of fresh water by a simple and technically easily controlled means. The concentration of the wash liquor which is to be disposed of shall be as high as possible, so that, if necessary, the reclamation of the materials contained within it is also possible. According to the invention, this purpose is fulfilled with a method described below.
In practice, the confined shaft itself forms a nozzle in which the treatment medium can take effect on the material web intensively and during a sufficiently long period of time. The maintenance of an over-pressure relative to atmospheric pressure causes a turbulent flow of relatively high speed in one direction of the shaft. The use of a vaporous, respectively a gaseous, treatment medium has the advantage that the use of liquid treatment medium can be kept as low as possible. The materials detached from the fabric web by the vapor accumulate with a high concentration in the liquid components, whilst the vapor is easily drawn off and can be once again supplied after a preparation process. The material web can be additionally acted upon with a liquid treatment medium out of a separate arrangement of nozzles. The use of saturated steam and/or air and of wash liquor is also conceivable, whereby each medium is introduced into the chamber out of a separate arrangement of nozzles, respectively is applied to the material web. A wash liquor applied to the material web can, for example, be subsequently removed again by a gaseous medium, respectively partly vaporized so that no special squeezing rolle
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Keller Werner
Weber Hans
Benninger AG
Coe Philip R.
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