DE6925092U - CELLULOSE FIBER WEB. - Google Patents

Description

According to the invention, a pulp or paperboard web, which is produced with a conventional paper machine from the cylinder or "Fourdrinier" type, and which is normally difficult to fiberize, is extraordinarily mechanical are easily shredded if the cardboard or the approach or entry for the production of the same with certain Quantities of certain types or groups of chemical compounds is impregnated. It was found that these types or groups of chemical compounds in suitable amounts applied the cohesion or the adhesiveness of the with it treated pulp or pulp layers in an unusual way effectively reduce, so that when the pulp layer

dried and a mechanical abrasion or crushing process is subjected, the layer-forming fibers are substantially completely separated from one another and form a very loose fiber web. The height or bulkiness of this fiber material web is 33 1/3 or more percent higher than that of the same fiber material web ,. not chemically before the fiberization process was treated.

Apparently, the selected high-performance chemicals break or reduce the usual bond between the strands, so that these chemicals act as an agent which reduces the adhesion between the strands. This effect, which reduces the adhesion, is also revealed in the fact that the tensile strength of the treated pulp layer or cardboard is only about 1/3 to 1 ½ that of an equally untreated layer. For a treated layer, for example, a tensile strength of about 0.14l kg / cm is typical for a layer or cardboard that has a weight of 0.130 kg / m, in contrast to an untreated layer or cardboard, the usual ones
owns.

2 typically has a tensile strength of 0.421 to 0.562 kg / cm

The chemicals that cause this remarkable decrease in the tensile strength of the pulp layer or paperboard as well as the comparatively easy mechanical frayability of the material and the increase in height or bulk Effectiveness of the defibrated material can generally be referred to as a cationic long-chain pettalkyl compound which preferably have at least 12 carbon atoms in at least one alkyl chain. One of the important Characteristic of these compounds is their cationic nature, due to

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which they are chemically attracted to the anionic fibers. It also appears that the highly effective adhesive reduction of these chemicals is long-chain chemical Bold-type compounds is peculiar to. It is also important from the standpoint of effective adhesion reduction that these chemical compounds have at least 12 carbon atoms in the alkyl chain or - if a compound of the dialkyl type is used - have in at least one of the alkyl chains.

The active chemicals can also be subgenerically divided into the following groups: quaternary ammonium compounds, tertiary, secondary and primary amine salts. Some of the quaternary ammonium compounds were found to be more advantageous than some of the amines for reducing the tensile strength of the layer or cardboard from usually 0.421, 0.492 or 0.562 kg / cm ² to 0.14 l or 0.211 kg / cm. However, a number of the long chain type primary amines having about 16, 18 or more carbon atoms have been found to be very effective in reducing adhesion.

The following are some illustrative but non-limiting examples of the chemicals mentioned above four groups specified:

Quaternary ammonium salts

Mono cottonseed fat alkyl triHethyl ammonium chloride, mono coconut oil alkyl trimethyl ammonium chloride, Monosteary1-trimethy1-ammoniur- ^{v Ί} orid, Monooleyl-trimethyl-ammoniumchj-orid,

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Mono-soy fatty alkyl trimethyl ammonium chloride, dilauryl dimethyl ammonium chloride, difatty alkyl dimethyl ammonium chloride, with hydrogenated TaIg fatty alkyl residues, disoy fatty alkyl dimethyl ammonium chloride, N-alkyl (C ₁₀ ,,,, A -dimethyl benzyl ammonium chloride, coconut fatty alkyl dimethyl benzyl ammonium chloride;

Tertiary amine salts

Monostearyl dimethyl amine hydrochloride;

Secondary amine salts

Dicoconut fatty alkyl amine hydrochloride, ditallow fatty alkyl amine hydrochloride with hydrogenated pettalkyl radicals,

Dioleyl amine hydrochloride;

Primary amine salts

Dodecyl amine hydrochloride, Palmityl amine hydrochloride, coconut oil alkyl amine chloride, Coconut oil alkyl amine acetate, Stearyl amine hydrochloride, Stearyl amine acetate, Oley] amine hydrochloride, Oleyl amine acetate, soy fatty alkyl amine chloride, Tallow fatty alkyl amine chloride.

Any one or more of the selected compounds listed above can be attached to the pulp or the pulp layer

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a number of different locations or at different procedural steps in the usual cardboard manufacturing process can be added. For example, the chemicals can be added to the pulp slurry in a material container before it is added be added to the paper or board machine, which is advantageous when it is desired that the chemicals are in contact with the cellulose fibers for a period of time, e.g. 5 to 10 minutes, before the pulp Paper machine is fed. If there is prolonged contact of the chemicals with the pulp before the layer is not formed necessary or desired, the chemicals can be added added to the first chamber of the paper machine.

Depending on the type of paper or cardboard manufacturing machine used, the desired speed the process and the desired degree of impregnation of the fibers with the chemicals, the chemicals introduced into the layer in the wet press section of the paper machine by means of a known device such as by means of a size press or the like. Here, the chemicals introduced into the previously formed pulp layer or cardboard, while this is still relatively fruity and before the layer or cardboard is finally dried on the machine.

A suitable type of "Fourdrinier" paper machine and the method of making paper on this machine is described in U.S. Patent No. 2,488,700 to G.L. Bedwell, granted on November 22, 1949, c ^ fenbartj and a suitable type of a cylinder engine is disclosed in U.S. Patent No. 2,005,839 to Jacob Edge, issued June 25, 1955 *. Regarding of paper machines and their use in the present invention, reference is made to these patents.

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The amount of the chemical or chemicals added to the pulp furnish, slurry, or pulp layer is essential and may vary with the type of pulp used and the amount of reduction desired Adhesion strength vary within the limits given below. Usually this amount is between 0.1 and 5 percent by weight, based on the dry weight of the pulp, and in most cases the chemicals are already highly effective at the lower end of this range with amounts below 1.0 #.

A range of 0.25 % to $ 0.5 is preferred. In most cases, the amount should be over $ 0.1. The small amount of 0.1% already gives the pulp a certain softness. In order to improve the pulpability of the pulp significantly, the addition of chemicals should not be less than $ 0.25. When practicing the process on an industrial scale using sulfite pulp, the best results are obtained with an amount of $ 0.3 to $ 0.5. When using cellulose obtained by the sulphate process, the pulp is somewhat harder and less easy to shred. In this case, amounts of $ 0.5 or slightly higher should be used. Levels of 1% or more are usually not required. Such increased amounts can lead to a further improvement in the pulpability of the pulp. However, this effect does not generally justify the increased chemical costs.

Within the above range of $ 0.25 to $ 0.5, the effectiveness of the chemical treatment of the pulp in accordance with the present invention in increasing the friability of the pulp length is substantially proportional to the amount of chemical used. For example, it has been found that in the case of sulfite pulp an amount of $ 0.3, based on the dry pulp weight, reduces the tensile strength of the pulp layer to 1/3 of the tensile strength of the untreated pulp layer.

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Using 0.5 % of the chemical in the same sulphite pulp pulp results in a reduction in the tensile strength of the pulp layer to about 1 ½ of the tensile strength of the untreated pulp layer. This extraordinary reduction in the tensile strength of the pulp ply is accompanied by a corresponding improvement in the fiberisation properties of the pulp ply, so that the ply is very easily fiberized and provides a bulky, clean and uniformly long fiber material.

'The present invention is practically applied to all usual Pulpetypen, which in a conventional manner by the well-' · known "Karft" - or neutral, soda, sulfite, sulfite process are prepared.

As a raw material, i.e. as a piping, according to the invention pulping, impregnating and layering can be any one or a combination of more of the "Various types of pulp materials are commonly used are used in paper and cardboard production, for example wood, Baumwo11inters, flax, hemp, ramie, Bagasse and Esparto pulps. Generally speaking, it is it is desirable to use relatively long fiber material to achieve this a maximum resistance of the individual fibers and a high resistance to breaking, Z ^ rpowders and sputtering as the layer shreds.

After introducing the chemicals into the pulp layer or paperboard at any desired location mentioned above the formed and impregnated moist layer is then passed over conventional drying cylinders, such as those in a paper machine can be used to make a substantially dried paperboard with a moisture from about 5 to 10 percent by weight, which is usually

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A thickness of about 1.6 to 3.2 mm, the dried cardboard normally being rolled up into rolls for storage or shipping and finally being mechanically defibrated to form the above-described highly loose and fluffy defibrated material or fiber fleece to manufacture. The finished loose material can be used for any purpose, such as for diapers, sanitary napkins or other sanitary products or for stuffing or upholstering, especially where a bulky or bulky material is required. The bulky and voluminous properties of this material are also beneficial in absorbing body fluids. It has surprisingly been found that the material produced according to the invention has a particularly high moisture absorption capacity. This is much higher than with conventional shredded cellulose fibers. This is all the more surprising since the chemicals used usually serve to make such a fiber material hydrophobic, ie water-repellent, so that it would be expected that the absorbency of the material would be lower. The surprising effect is evidently due to the fact that the bulkiness and bulkiness of the material according to the invention is so great that an extraordinarily high moisture absorption capacity is created.

In Fig. 1, a sheet of the cellulose fiber web or cardboard according to the invention is shown in perspective. These Cardboard is particularly bulky and light and is particularly suitable for use as a filter or filter paper and for packaging purposes.

1. Claims

Claims (8)

PROTECTION CLAIMS 1. Cellulose fiber web, characterized in that that the fibers by a surfactant in the form of a cationic long-chain term fatty alkyl compound with at least 12 carbon atoms are impregnated in at least one alkyl chain and in an amount from OyI to 5.0 # i ». 2. Cellulose fiber web according to claim 1, characterized in that the amount of the surface-active agent is below 1.0 i » . 3. cellulosic fibrous web according to claim 1, characterized ekennzeichnet g, that the amount of the interfacial active agent 0.25 to l, 0 # is. 4. Cellulose fiber web according to one of claims 1 to 3, characterized in that the tensile strength the .bahn reduced to about 1/3 to 1/4 of the normal tensile strength without surfactant is. LAVIKOITIVl ROBCHKCZ ACCOUNT Mt) KCH SXVXSOHB UVE MÜMOBKJf -2- XK- V. WBCBiEI-BAHK Mt) BOBBW 4/8 «* 00 BBAKK Mt) WCBBK (. ((OO 5. Cellulose fiber web according to one of claims 1 to 41, characterized in that it «u» zerfasertii. and loosened '. 6. cellulosic fibrous web according to any one of claims 1 to 5, characterized gekennz eichnet _t that the surfactant is a quaternary Aiumoniumsalz or a salt of a primary, secondary or tertiary amine. 7. Cellulose fiber web after a del? Claims 1 to 6, characterized in that it consists of wood pulp fibers. 8. Cellulose fiber web according to claim 7, characterized in that g e characterizes t that the surfactant is a dialkyl difatty alkyl quaternary ammonium salt is. \ 692509213.1173