DEV0009850MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: March 20, 1939 Advertised on May 24, 1956

GERMAN PATENT OFFICE

The subject of patent 710 790 is the use of surface-active activated carbon or silica gel containing cellulose wadding for dressing and for medical and sanitary purposes. object of the present application is first of all the process for the production of surface-active cellulose wadding, also expansions in the combination of applications. As a carrier of the surface-active Properties are essentially silica gel and active charcoal. The recently for Fuller's earth used for adsorption purposes is of minor importance. Active coal both and silica gel, as tests on the paper machine have shown, have a negligible one low tendency to become embedded in the thin cellulose fleece during cellulose wadding. Out A snow-white fleece emerges from the paper pulp that appears black. The coal suspension goes almost completely in the throughfeed (Fourdrinier machine). The use of paper chemical intermediaries has no influence on this result. It would also result in an extensive electrical charge reversal Charcoal, which could promote binding to the fiber, destroy the active properties of the charcoal.

It has now been found that there is a critical level of saturation of the pulp to be more active Charcoal or silica gel, above which the

, 609 527/432

Claims (8)

V 9850 IYaI30 ί storage is getting better and better. However, here too the loss is considerable. But while adding το '/ »a snow-white cellulose wadding results, the amount of stored coal can only be negligibly small, with an addition of ΐοοΎο coal, ie a content of So ⁰ Zo, a cellulose wadding containing about 15% coal to win. By reusing the flow in the closest cycle, a process that is completely loss-free from the outside can be developed with the technical means currently known. This reuse can be done by filtering (Adgofilter) or by using the run-through as spray water, for which there has recently been a turbo-mechanical design. ^{Characterized:} coat of the need to use fresh water from which is then only necessary for the washing of the cloths, and in an amount corresponding to the evaporation loss of the drying drum. This method therefore gives the possibility of achieving a carbon storage (silica gel storage) of up to 40% in the very tightest cycle and at high concentrations. .25 In spite of the elimination of external losses, an internal one is liable to the above-described procedure Loss at. This is the loss of activity. The coal suffers in the course of this. Procedure one Activity loss of 30 to 40%. A different method was therefore sought, the such A ^ avoids losses. This was found according to the invention in the method described below. The fleece removed from the paper web by the top cloth is passed through the bottom cloth of the Drying drum fed. In this section the fleece is still completely wet and suitable for the addition of charcoal or silica gel. It is unsuitable at the moment of drying. According to the invention the cellulose fleece is now through immediately after its entry into the drying cylinder a battery of nozzles operated with compressed air with an aqueous suspension of activated carbon or splashed with silica gel. The very finely atomized wet coal is stored in the fleece, with the Spray angle must be tried out, and lies firmly in the after drying and creping Cellulose wadding embedded. In this way you can easily get 30 to 50% activated carbon or silica gel Make the cellulose wadding it contains. A loss So activity could not be determined, so that this process must be considered particularly suitable for the production of surface-active cellulose wadding. In order to make the cellulose fleece particularly receptive to the charcoal or Silica gel suspension, can be added to the paper pulp in the Dutch kieselguhr, in the purified, burned up or in the technical form. The addition of kieselguhr increases the absorbency the cellulose wadding is significantly increased while saving cellulose. With this procedure can similar to the procedure described at the beginning for the incorporation of activated carbon or silica gel in the same excess process with The closest recycling can be worked without loss, since a loss of activity is an internal loss comes in omission, so the process pursues a pure material utilization. The so changed material The texture of the cellulose web is particularly suitable for the storage of active charcoal or silica gel good conditions, whereby it is recommended the grain size of the activated carbon or of the silica gel to be selected as fine as possible. A little bolus can be added for better binding. In the further processing of cellulose wadding, which in this way as carbon cellulose wadding or If silica gel cellulose wadding has been obtained, these two cellulose wadding can be used together are taking into account the following guidelines. The adsorption properties of the active Coals are different from those of silica gel. While activated carbon is predominantly hydrocarbons and other viscous compounds are adsorbed, the adsorption properties of the silica gel are to the Water solubility bound. So silica gel adsorbs vapors, especially near the dew point, that is also odorous substances, insofar as they are soluble in water. As already mentioned, it can of course also be used as a further surface-active substance bleaching earth are used, just like any other at the moment unknown surface-active body according to its active properties. The good odor-binding one The effect of the fuller's earth makes it easily usable for sanitary purposes. Since the carbon cellulose wadding not only has a black appearance, but also stains to a very small extent, it is recommended to use it to be layered with silica gel cellulose wadding. This also gives you the advantage of a combination different adsorption widths. One wants to summarize various adsorption properties go on, you can put the carbon cellulose wadding on one of the soap with silica gel wadding, wrap on the other side with fuller's earth cellulose wadding, or any other Choose combinations in the layering. Finally, the yarns used for the covering can be spun with silica gel. The cellulose wadding can also be made up of closed sheets, which z. B. for the Use as a replaceable sweat sheet or insoles (for sweaty feet), too in technical application, e.g. B. for odor-tight, but air-permeable covering, etc. can be of importance. ■ Patent claims: i. Process for the production of surface-active cellulose wadding according to patent 710,790 with the addition of surface-active substances such as activated carbon or silica gel or fuller's earth, during the manufacturing process of the. Line., Cotton wool, characterized in that it is added to the paper pulp in such a high concentration that in the course of this oversupply process there is a substantial storage 527/432 V 9850 IVa / 30 ί into the cellulose fleece with the closest reuse of the throughput .. 2. Process for the production of surface-active cellulose wadding with the addition of surface-active ones Substances such as activated carbon or silica gel or fuller's earth during the manufacturing process the cellulose wadding, characterized in that these substances are suspended in known spraying processes on the drying cylinder can be atomized onto the fleece. : 3. The method according to claim 2, characterized in that that the suspension is sprayed on in the inlet section of the drying cylinder, in particular immediately after it has arrived of the cellulose fleece on the drying cylinder. 4. The method according to claim 2 and 3, characterized in that the injection either perpendicular to the nonwoven web or twisting therefrom takes place in the opposite direction to the nonwoven movement, so that . Vlie's movement and injection movement collide. 5. The method according to claim 2 to 4, characterized in that the brought into suspension Substances are used in a very finely ground condition. 6. The method according to claim 2 to 5, characterized in that various active substances, z. B. activated carbon and silica gel, can be used in a mixture with one another. 7. The method according to claim 2 to 6, characterized in that the sprayed-on suspension neutral binders such as boluses can be added. 8. The method according to claim 2 to 7, characterized in that the used for spraying Cellulose wadding in the same production process in an excess process according to claim ι is weighted with kieselguhr that the kieselguhr used for this purpose in their so-called technical use form or in purified, especially in burned-up form Form is added. ι 609 527/432 5.56