DE537335C - Process for the production of cellulose or pulp which is easily divided in water for paper manufacture - Google Patents

Description

Process for the production of pulp which can be easily divided in water or pulp for papermaking. The rag pulp and pulp mills send their products partly in a damp or wet condition, partly in, air dry to the paper mills.

The drying of the pulp or pulp is partly done in Arches in drying chambers, partly in chunks, but mostly in endless Tracks on heated cylinders such as those on dewatering machines are well known are.

It is known that rag pulp and those made of wood, straw, esparto or other raw materials, which in the moist state, eg. B. with 40 or 60 % water, have been processed, papers with higher quality properties, z. B. strength properties, result as those which have previously been dried on drying cylinders to the so-called air dryness.

Because the transportation of wet or moist pulp at high cost is connected, one pulls in most cases the drying up to the so-called Air drying before, and the paper maker takes away the disadvantages associated with it with in purchase.

These drawbacks are the loss of time and strength in redissolving or opening of the semi-finished or cellulose pulp in the Hollander or in other fiberizing machines; Furthermore, every pulp and pulp loses its strength when it is exposed to high temperatures is dried.

In the present invention, by adding hygroscopic agents neutral nature to the moist matter prevents these pulps and pulps give off their last amounts of moisture. Even with strong drying then remains in the inner cavities of the fiber a fairly concentrated solution of the hygroscopic Substance back.

Such hygroscopic agents of a neutral nature are all types of sugar, such as B. Dextrose, invert sugar, wood sugar, sugary liquors from the beet and cane sugar industry as well as the sugary waste liquors from the glucose or dextrose production.

The impregnation of the pulp or pulp is effected by that at any point in the dewatering machine before the drying cylinders aqueous Solutions of the above types of sugar are sprayed on in such amounts that at least l / "° / o of these sugars is in the dry substance.

Amounts of sugar of : '/ ",'/" in the substance are only of little effect, in practice only an addition of 112% upwards is noticeable, additions of 314 to 11% are very favorable; in some cases, where very quick dissolving and high firmness are important, the sugar content is even more important. Increase by another percent.

Dextrose has proven itself particularly well. E.g. papers pointed from pulp without glucose dried on drying cylinders, compared with Papers out Pulp with r12% / a dextrose in the same way dried, far shorter tear lengths and noticeably reduced double folds on.

Claims (1)

PATENT CLAIM: Process for the production of easily divisible in water Cellulose or pulp for paper manufacture, characterized in that the substance in web, sheet or lump form is sugar before drying in dissolved form, such as dextrose, invert sugar, wood sugar solution, sugary Waste liquor from beet, cane and glucose or dextrose production in one Amount of at least o, z ° / o of the air-dry substance is added.