DE2051717A1 - Patterned paper with a simulated, woven structure - Google Patents

Description

DIPL.-INQ. KLAUS BEHN DlPL-PHYS. ROBERT MÜNZHUBER

PATENT LAWYERS

β MUNICH aa WIDENMAVERSTRASSES TEL. (0811) 02 20 30-29 0102

US. Sign: A 32870 Doe.

Oct 21, 1970

Company TACHIEAWA EESEAEOH INSTCTUiEE, 199, Nakanocho, Shirakawabashi Higashi 4-chome, Sanjo, Higashiyama-Ku,

Kyoto / Japan %

Patterned paper with a simulated, woven structure

The invention relates to patterned self-binding formed paper and, in particular, a paper product made from viscose fibers that are not fully regenerated, which is provided with a pattern by a special pattern device. It is the object of the invention a modified papermaking process makes it inexpensive, excellent and looks like a woven fabric Paper with high strength and especially high

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To create wet strength.

The "primary source value" (PSV) mentioned in the description is calculated from the following equation:

W χ 100 = primary swelling value (PSV) in%,

^W D

where W daa is the weight of the fibers (in the case of cellulose of about 0.5 g) which, after being ^{immersed in distilled water at 20 °} C. for 5 minutes, are centrifuged with a force of 1,000 G for 3 minutes. Wp. Is the weight of the oven-dry pars.

The "water content value" (WV) mentioned in the description is calculated from the following equation:

W χ 100 = water content value (WV) in #, ^W d

where W is the weight of a wet sheet (5 g wet sheet) is. W, is the weight of an oven-dry sheet after it was treated for 1 minute in a 90 to 100 C hot solution of 3 g sulfuric acid per liter and washed thoroughly is.

The product of the invention is obtained by the following process. When spinning a viscose with high

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The viscosity and high Y value in a low-concentration acid bath result in incompletely regenerated cellulose threads with a PSV in the range from 800 to 10,000%. The threads are cut and dispersed in the water, resulting in a stock solution. The stock solution is sent to a paper machine. A wet paper is formed there. The wet sheet thus obtained is pressed in places with a pattern device when the WV of the sheet is between $ 600 and $ 6,000. The paper is then taken to a post-treatment section, ie the cellulose is completely regenerated, desulphurised, bleached and washed. The wet sheet is then dried / net in the drying section.

The product of the invention has three distinctive features, first, that the product has three parts of different thickness and density. This difference in thickness and density results from the set point comparison% seal of the wet sheet, namely when its WV 600-6000 $ located. A part or a larger part of the fibers in the pressed areas move as a result of this compression into the non-pressed areas which adjoin the pressed areas. As a result, the pressed areas (first part) become thinner or perforated and - apart from the perforated areas - have the highest density. On the other hand, the

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non-pressed adjacent to the pressed areas Areas (second part) thicker and have a higher density. There are also areas (third part) on which no compression takes place and which thereby retained the original thickness and density

A specialty is paper sheets with only a first and a second part, without the one described below third part.

Second, the product has an uneven pattern. The thinner ones Areas (first part) form indentations and the thicker areas (second part) like the areas with original thickness (third part) have protrusions on the side facing the pattern device.

Third, the individual fibers which make up the product are _/ connected by .a self-bonding force chemically with one another. After the sampling process, a sheet of nasal paper still contains incompletely regenerated cellulose fibers and, accordingly, the hydrogen chains between the adjacent fibers are formed in the regeneration bath during the entire regeneration process. Daduroh gives the paper a high tear strength and a particularly high wet tear strength. The paper sheet of the invention is different

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At this point completely different from the well-known paper products, due to the intertwining properties of each Fibers are made with each other or or from non-woven fabrics or from papers made of ßayon which are formed by the binding force of the tiined materials enclosed between the fibers.

The sample process is used to clarify the product the invention explained in detail »There are three basic processes, to pattern a wet sheet of paper.

In the first method, a wire mesh is used as a pattern device. A wet sheet is passed through a number of sleeves together with the wire mesh. Then a pattern of the wire mesh is applied to the wet sheet. In this case, the bumps of the wire mesh correspond to the pressed areas and the meshes of the wire mesh correspond to the non-pressed areas. As a result, the finished product differs in three parts, that is, as in ™

4, in the thinner areas 2, the areas with original thickness 3 and the thicker areas 1. In addition, the pressed areas make 2 indentations and the unpressed areas 1 and 3 are protrusions With regard to the U side 4 facing the pattern device.

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In the second method, one of the press rolls is used as a pattern device used. The wet sheet of paper is pressed by passing it through the press rollers. One of these Roller has a number of protrusions regularly arranged on the surface. The ones with ledges The press roller provided is made of metal and the other is made of rubber. In such a device, the pre-

^. Jumps the pressed, i.e. the thinner areas and the indentations located between the projections not pressed, i.e. the thicker areas. In this pattern process, if the ratio of a protrusion area to an indentation area is correctly selected, the corresponding areas selected so that the finished product differs only in two parts, the thinner and the thicker Areas where the missing areas have the original thickness. In this case, the unpressed form

W areas of protrusions and the pressed areas of indentations with respect to the side facing the pattern device.

■ · ■ ..: '.:; ■■; ·> Iw

In the third method, a metal plate is used as a pattern device on which a number of patterns regularly made therein are stamped. ¹ The sheet of nasee paper is fed through the press rollers and

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represst, wherein one of the rolls from the metal plate environmentally biases v, ird "In this pattern the procedures comply with the punched areas not pressed, d _o h" the thicker areas and the solid part of the plate corresponds to the pressed area. Are the pressure taking place by movement of the fibers is limited to the non-compressed, in the vicinity of the pressed portions areas _o In this T'Tust erverfahren areas with an original thickness exist, namely at the inner part of the pattern of the final product.

In the invention, the fibers, the PSY ranging from 800 to 10,000%, and the // V ranging from 600 to 6,000% bond together firmly to form a fairly firm, wet sheet. The fibers of the leaf can easily move through simple compression due to their flow properties, due to their high PSY or WV. This results in _{clear patterns (} by the pattern process mentioned above. The pattern obtained is solidified in the moist sheet during the subsequent regeneration treatment and remains as it is in the end product.

With this sample process, it is easy to exchange the sample device depending on the use of the product. For example, when sampling with a wire mesh, different

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BATH

dene products are obtained by changing the mesh of the wire mesh or the knitted fabric of the same.

When sampling, by means of roller rollers equipped with press rollers can make different products by changing the features ^ crack shape, the number of total protrusions or the ratio of the total area of the projections to the total area of the indentations ^ obtained v / ground. This is true also for the punched plate too. Also, the patterns can be made up of a combination of different shapes the product will be transferred. '

Embodiments of the invention are shown in the figures, for example shown, namely show:

Fig. 1 is a plan view of a wire mesh, Fig. 2 is a cross section along the line A-A 'in Fig. 1,

Fig. 3 is a top plan view of a using a wire mesh produced paper sheet,

Fig. 4 shows a cross section along the line B-B 'in Fig. 3,

Fig. 5 is a top plan view of a multi-protruded fluff roll;

Fig. 6 shows a cross section along the line G-C in F, ig. 5 »

Fig. 7 is a cross section of a paper sheet which has been produced using a pattern roller;

8 is a plan view of a pattern device acting, punched plate wrapped around one of the rollers,

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Pig. 9 shows a cross section through a stamped plate

along the line DD ¹ in Mg. 8 and ·

Pig.-10 a cross-section through a sheet of paper, which is produced by a stamped plate acting as a pattern device.

This pattern process gives the product suppleness and flexibility. Besides, the product looks and feels like it's woven. On the other hand, the manufacturing cost of the material is low as in this invention Cellulose is used as the starting material and a binder is therefore superfluous. The product can can be used in a variety of ways and can be used, for example, as a single use, such as the top support for baby diapers or sanitary napkins, as sheets in hotels or hospitals, Thrown away as a throw over hospital uniforms or medical articles and after use will.

There are various products that transfer a woven pattern onto paper or onto non-woven fabrics. So A

For example, in U.S. Patent Specification Ho. 2,771,363, a patterned paper using a heavy, in a Large-mesh wire screen located on the paper machine. In this process, part of the pasers at the hump points of the umbrella move to the perforated ones Umbrella areas, dividing a damp sheet of paper through two parts, namely the thinner and the thicker one

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Areas is formed. This makes this product quite similar to that of the invention. However, in that product the sheet formed by matting of the fiber components " That is, the sheet is formed by mechanical force. This is where the product mentioned differs entirely different from that of this invention, in which the fiber components are chemically bonded to one another by self-binding force £ to be connected. Moreover, in that invention, the density of the product is essentially throughout the sheet same. In contrast, in this invention is density of the leaf is different in each part, that is, the greatest density is in the thinner part, a higher density in the thicker part Part and the original density in the part of the original thickness.

On the other hand, a non-woven material is used in U3 specification Io. 3 240 657 explains, in which tk is assumed to be a carding strand and a pattern of knots and holes uniformly distributed over the surface is transferred to the material using a pattern device. In this patent the strength of the sheet is due to a binder as shown in Examples 1 and 2. This shows that that product differs from the product of the invention.

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separates, in which the fiber components chemically bond with one another, through a self-binding force. Moreover, in the _f described by that patent products, the density of the thinner portion is equal to that of the

thicker part, as described in U.S. Patent Specification No. 2,771,363.

The US patent specifications Έο 3081 is 5.14 and 3,081,515 include a product made of perforated non-woven ma- ä TERIAL. Both patents deal with almost the same subject. In these products the material comprises a plurality of yarn-like groups of fibers, the fibers forming the groups being substantially parallel. In addition, the fibers in the material are in the middle

mechanical equilibrium and the associated fiber segments are in mechanical equilibrium at each connection point Engagement with each other.

On the other hand, the fibers randomly Λ in this invention are distributed, not parallel and not disposed in thread-like groups. In addition, the fiber components are chemically bonded to one another through a self-binding force.

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Claims (4)

- 12 - PATENT CLAIMS [1 Δ patterned paper or the like made of incompletely regenerated viscose fibers, characterized in that the product is composed of the following three parts: from thin areas (2) with the greatest density, or from perforated areas, from thicker areas (1) with a relatively high density and from areas (3) with original thickness and density, but whose density is lower than that of the other areas, the thinner areas (2) forming indentations and the thicker areas * (1), like the areas (3) with have original thickness projections with regard to the side facing the pattern device and the paser constituents forming the product are chemically bonded to one another by self-bonding force. 2. Paper according to claim 1, characterized in that the product is composed of the following two parts: the thinner area (2) with higher density or ^: the perforated area and the thicker areas (1) j with lower diameter,. ί 1 09883/1039 3. Paper according to claim 1, characterized in that all thinner areas are in communication with one another and all of the individual thicker areas are islands surrounding the thinner areas. 4. Paper according to claim 2, characterized in that all the thicker areas are in communication with one another and all of the individual, thinner areas are islands surrounding the thicker areas. 10 9883/1039 Blank page