DE112773C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In the case of the German patents 85564 and 97664, as well as in the English The method described in patent specification 4452/90 complicates the tight state of the cotton during the mercerization or washing, the admission of the mercerization liquid resp. of Detergent for the interior of the material; this occurs especially with tightly twisted yarns and seal tissues. Hence the mercerization is uneven; the The outer layers are more strongly attacked by the lye than the inner ones. Also must the cotton should be washed very long and vigorously until the lye inside is diluted to such an extent that when the cotton is removed from the jig a No more shrinking of the inner parts due to the renewed action of the lye entry.

This inconvenience is now avoided in the present process by the fact that one works at a low temperature (as already suggested in patent 37658, for example is) and for mercerising under tension a diluted mercerising liquid uses, which would be almost ineffective at ordinary temperature. If you pause this Condition one can easily get the cotton in the untensioned condition with the thinned one Soak mercerizing agent through and through without contraction. Then you tighten If the cotton is used and the cold is applied, the lowering of the temperature is planted in it very briefly through the soaked cotton, so the washing liquid will dissolve and cold inside almost at the same rate, and the mercerising one which occurs at a low temperature The effect of the diluted solution therefore begins everywhere at the same time. A stronger attack on the outer layers is therefore excluded.

Likewise, after the mercerization has ended, one can increase the temperature almost instantly put the lye on or off. the formed connection of Dismantle cellulose again with the mercerizing agent, and then more conveniently in the loose state and wash out more thoroughly, as this means that the fibers no longer need to be feared is.

This rapid merging of the cotton placed on the jig Cold and the just as quick reversal of the shrinking effect through warming not only accelerates the process considerably, but also offers the advantage of a lesser one Wear of the (only stressed for a short time by the shrinkage force of the cotton) Machines, as well as a saving in chemicals, since the mercerized liquid is almost quantitative is recovered.

The practical execution of the procedure can, apart from the specified new Characteristics, as in those cited

Patents is indicated. The following is an example embodiment thereof described:

The diluted sodium hydroxide solution from io to 12 ° B. wetted fiber is applied to the jig, then a temperature exposed below o °. The mercerization of the cotton which takes place thereby causes it a strong tension of the same. After the mercerisirprocefs is completed, the cotton becomes brought back to normal temperature, with the tension easing.

The cotton is then removed from the jig, as completely as possible freed from the lye by squeezing, spinning, etc. and finally washed out and acidified.

Instead of the cotton in a stretched state with the diluted lye at a low temperature To treat it, it can also be loosely mercerized and then stretched. Instead of the You can apply lye to the cotton first and then cool it down immediately Apply cold lye. The fixation of the by the cold liquor in the tensioned fiber The induced state can also be washed out or neutralized instead of by heating happen or bezw by stretching beyond the original dimensions and heating. Wash out in the loose state and so on. ,

Claims (1)

Patent claim: A modification of the patent specifications 85564 and 97664 as well as in the English Patent specification 4452/90 described process for the mercerization of vegetable fibers, characterized in that the tensioned fiber is at a temperature below 0 ° of the action exposed to diluted alkalis.