DE1560871B2 - TWO-LAYER FIBER WINDOW MADE OF NON-WOVEN FIBERS - Google Patents

Description

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sanitary bandages or the like contributes to the requirements to be made supple, soft handle of the product,

optimally fulfilled. In addition, the open adhesive pattern also leads

This object is achieved according to the invention in that essential areas of the top layer of the solves that the base layer of creped cellulose product remain adhesive-free and thus the silky cotton with a basis weight of about 6.8 to 5 appearance and the skin tolerance of the highly ver-20 g / m ² in the uncreped state and a crepe-drawn fiber layer are preserved. This last ratio of about 1.1 to 2.5 consists, the above-mentioned effect can be achieved by an only partial single layer made of synthetic fibers with an embedding of the fibers of the highly drawn fiber layer denier value of about 0.5 to 3 in reinforce the glue.
Layer with a basis weight of about 2.5 to 10 As mentioned, the application of an adhesive is 20g / m ² , in which the fibers 80 to 95% straight in the form of a regular open, eg grid-like and parallel and aligned to their full Length pattern is known per se, namely from the German, and the adhesive in per se patent specification 767 479. There the open adhesive edge is provided in the form of a regular, open fabric pattern, however, for solidifying a single-layer pattern, with the base layer and carded fleece in the sense of a gluing of the top layer through the adhesive only in the individual fibers with each other, whereby the areas defined by the pattern are additionally connected to each other at the glue points and the fibers of the top layer are pressed together. It is thus bound by embedding in the adhesive and not held in the connection of the layers of two of their orientations. The 20-layer fiber web is preferred, and the design is not such that the task of the adhesive is to make use of the strength properties of warped, light fiber webs that have at least partially penetrated the base layer, while the fibers of the top layer are only partially embedded in the adhesive without at the same time an unreasonable deterioration and whose outwardly other properties, for example the pliability-facing surfaces, are kept practically adhesive-free and the moisture permeability, are acceptable. to have to. When using the known

The invention is based on the consistent adhesion in an open, lattice-like pattern for an application of the knowledge that the disadvantages of a layered, highly warped light fiber web, such as the highly warped light fiber web, namely the poor manipulability of the upper layer in the product according to the invention and the unsatisfactory one , there would not be sufficient strengths such as grip, suppleness and moisture penetration or the problems already described in terms of permeability with the usual full-surface gluing and manipulation would arise,
no longer occur when the highly warped light In the rest of it is known from the German patent fiber web together with a light base layer 119 740, a wallcovering processed in decoratiaus creped cellulose wadding and with 35 ver to improve by the fact that on an undieser in an open adhesive pattern glued pad made of paper, fabric or the like. A tape is made. This creates a product that is glued on with parallel fibers. These are highly warped fiber webs that can achieve good feet, but apparently they have fibers of higher denier, also the advantages of highly warped value, which is lent by means of a roller with layers of synthetic fibers moistened with adhesive and then pressed onto the base A pleasant, silk-like appearance and apart from the completely different purpose of an extremely good skin-friendliness and task is the use of a retains and at the same time still the necessary grip-comparable working method with the inventive, suppleness and moisture-permeable product from the already explained above has, so optimally all requirements on a 45 th reasons not possible, so that overall no good wrapping material for sanitary towels and the like. Fulfilled. closer points of contact with the invention, it can also be due to the reduced ben.

Difficulties in manipulating the highly warped The invention is described below in an embodiment

A light track can also be explained in more detail with a high working example on the basis of the drawing.

establish speeds. 50 tert. In this represents

The open adhesive pattern is based on Fig. 1 schematically a machine for manufacturing

layer applied and fixes the fibers of the high- the two-layer fiber web according to the invention,

warped light fiber web in the desired shape. 2 shows an excerpt from the development of the

stretched, aligned position at the moment, the working surface of the machine according to FIG. 1

in which these fibers are used in contact 55 with the adhesive,

come without them coming back from FIG. 3 on a greatly enlarged scale a transverse

the adhesive bed must solve, as is the case with a cut of the two-layered according to the invention

Adhesive applicator roller is the case. As a result, the fibrous web is in the level 3-3 of FIG. 4 and

the strength of the product is secured and FIG. 4 is a photomicrograph of the

poor manipulability of the highly warped surface of the two-layered surface according to the invention

Overcome railway. The open adhesive pattern consists of fibrous web.

furthermore avoids those in a full-surface cladding in FIG. 1 machine shown includes practice occurring stiffness and moisture- supply roll 10, from which a web 11 from creped permeability of the product and also causes cellulose wadding to run off. This wad of cotton wool, which in that with a small proportion of the fibers the 65 known way by stretching and ironing on one The ends of the fibers are not bound by the adhesive; take a freely relaxed position no = discomfort has been brought off the role

which create a fluffy surface and a 10 working gap between an adhesive

roller 12 and a pressure roller 14. The gap size is set so that only a very small Pressure is exerted on the web 11. The glue roller 12 is etched on its work surface with a deep Provided pattern, for example the one shown in FIG. Honeycomb pattern formed by grooves 16 shown in FIG. However, other patterns can also be used for the working surface of the adhesive roller 12, provided that the requirement is met that the pattern is very open. The total area covered by the deep-etched Grooves of the pattern should not exceed 25% of the total work surface of the glue roll and preferably only about 15% or less of the total Working area. Furthermore, the pattern should preferably have a grid-like structure and in particular no interruptions in the grooves extending in the transverse direction of the web 11 exhibit.

In the operating state of the machine, the ribs 16 of the working surface of the adhesive roller 12 are continuously filled with a low-viscosity thermoplastic or elastomer adhesive 18 by dipping the lower region of the roller 12 into an adhesive tub 19. Before the ΪΓ? κ? Working surface of the roller 12 can reach the lap 11, euiAbstreicher 20 ensures that only a predetermined adhesive-The two-layer fiber web formed by the laying of the web 28 α on the lap 11 runs from the deflection roller 24 over a further deflection roller 30 and then around a heating roller 32. The heating roller 32 completes the setting of the adhesive located between the webs 11 and 28 a, so that the adhesive no longer has a sticky state when the two-layer fiber web runs off the heating roller 32. As can be seen from the drawing, the upper layer consisting of the synthetic fibers rests on the surface of the heating roller 32 during the setting of the adhesive. This is the preferred way of performing the setting process. Alternatively, the creped wadding layer of the two-layer fiber web can also lie against the surface of the heating roller during the setting process. In any case, it is expedient to cover the two-layer fiber web on as large a part as possible

_{2U of} the surface of the heating roller 32 to be brought into contact. To achieve this, a calender roller 34 can be provided at the outlet of the two-layer fiber web from the heating roller 32, which, based on _the axis of rotation of the heating roller 32, is at an _{angle considerably greater than 180} o to the inlet of _the two-layer fiber web. The calender _{roll 34 BMET DABD} ^ _{of the heating roller 32 has a nip 35 so that at the} completion of currency _rend ^ _{order to 'run of the heating roller 32} ^ border

The cotton wool web is essentially in the area of the Gap between the rollers 12 and 14. Some of the adhesive penetrates a little into the wad of cotton wool, during the. However, most of the adhesive remains on the surface of the cotton wool web. Also one some migration of the adhesive to the side occurs, but this is not further harmful if the Amount of adhesive transferred to the wad of cotton wool is dimensioned so that - according to the above-mentioned requirement - that of the adhesive The covered area of the cotton wool web is no larger even after the adhesive has migrated to the side is than about 25% (and preferably less than about 15%) of the total area of the lap. This open-plan structure of the adhesive on the wad of cotton gives the desired flexibility and Ensures the suppleness of the end product.

The cotton web 11 provided with adhesive runs from the gap between the rollers 12 and 14 to a deflection roller 24 which is arranged close to a stretching machine 26. From the stretching machine 26, a web 28a is delivered which consists of synthetic fibers with a denier value in the range from 0.5 to 3, which are almost completely oriented in the machine direction. This web 28 α is produced in that a number of slivers 28 made of synthetic fibers of staple length are drawn to a high degree in the stretching machine. The rovings 28 must contain a sufficient amount of fibers so that the high degree of warping still leads to a closed and uniform path 28 α. The web 28 a, the weight of which is preferably between about 2.5 to 20 g / m ² , is placed from the exit of the stretching machine 26 under constantly maintained tension on the side of the cotton web 11 which has previously been provided with the adhesive pattern.

In addition to the heating roller 32 shown, there can still be ^wide £ Heizemnchtungen z. B. additional heating rollers hot air stream, radiant heater od. The like., Can be used, which are arranged (relative to the running direction of the two-layer fiber web) either before or after the calender roll 34 and the ^acceleration of the setting process cause or the full completion of the setting process to make sure.

After the setting process, the two-layer fiber web runs over guide rollers 36 and 38 and via a further roller 40 to an end roller 13. The end roller 13 is formed on a spindle 42, which on a frame 44 pivotable about an axis 46 is mounted.

The base layer of the two-layer fiber web, ie the cotton wool layer 11, is used throughout The run from the supply roll 10 to the end roll 13 is kept under uniform tension, and in that the rollers 12, 34 and 40 are driven. The output from the stretching machine 26 Web 28 a made of synthetic fibers is up to the inlet of the two-layer fiber web to the heating roller 32 held under the same tension, so that during the joining of the web 11 with the web 28 a still practically all the fibers of the web 28 α in its parallel to the machine direction aligned state.

The practically completely preserved alignment of the individual fibers 48 of the web 28 a im finished product can be seen in the microphotography according to F i g. 4 can be seen clearly. At the same time this shows Photomicrograph showing the alignment of individual fibers 48 through the honeycomb adhesive lines 15 is securely fixed. If the proportion of fibers is relatively small, the fiber ends are not through bound the adhesive so that it

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be able to assume a tense position. This results in a reduction in the crepe ratio to about a somewhat fluffy surface, which is 1.1 to 1.5. Through this in the making of what is wanted soft, supple feel of the end-of-sight cloths commonly used technology product contributes. the base layer has a soft, supple

The representation of the F i g. 3, the cut lengthways 5 to handle, the next to the properties of the Absorpder Line 3-3 in Fig. 4 and thus as a section longitudinal tion ability, permeability and strength an adhesive line 15 is very desirable.

shows on an enlarged scale and somewhat schematic- The fibers used for the topsheet are

In the form of a table, the position of the individual fibers 48 is preferably of stack length, but can also be a finished product. It can be seen that the adhesive line 15, which is greater in length, about 10 to 75 mm or more, is deeply embedded in the wadding layer 11, with the majority of the fibers penetrating approximately into the area, but the fibers 48 only partially length of 25 mm. The main weight of the web in the adhesive 15 are embedded. The outward 28 α should appropriately be as small as possible, facing surfaces of the fibers 48 are practically The lower limit of this basic weight is adhesive-free, so that the finished product has a smooth 15 the processing ability of the web 28 a on the and - as mentioned above - given some fluffy stretching machine. In practice, surface can be possessed. Webs made from the aforesaid synthetic fibers

A number of different adhesives with a basis weight of about 2.5 to 20 g / m ^{2 can easily be used to glue the webs 11 and 28 a.} These tracks can be used with the. It is advantageous to use plastisols at an operating speed of about 6 to over, ie, colloidal dispersions of synthetic 150 m / min, which are applied to the base layer. Plastics in a suitable organic ester Subsequently, the invention will also be based on a plasticizer. Detailed numerical examples have proven to be particularly suitable,
at those plastisols that turned out to be plastic A creped wad of cotton wool that was made before creping

component polyvinyl chloride or copolymers of 25 had a basic weight of about 11 g / m ² and a crepe vinyl chloride with other vinyl plastics containing ratio of 2.2, was stretched and th and the organic phthalates, sebacate, ironing to a final crepe ratio are softened by about adipates or phosphates. Adhesive 1,2 brought. This web was in a honeycomb fabric of this type, characterized by a cutting edge printed with a plastisol adhesive, which consisted of the setting capacity, a relatively low viscosity, a low inclination to the walls, a relatively low viscosity of polyvinyl chloride - 60 parts by weight of dioctyl phthalate were dispersed and wrung within the cotton wool layer as well as through a diluted with raw alcohol. The adhesive has low volatility. In addition, they remain soft and flexible after being set in the amount of a little more than 5 g / m ² , which brought about and covered approximately 21% of the total desired supple, soft feel of the finished surface of the web. On the product provided with adhesive is cheap. A top layer of highly warped cotton wool was

The synthetic fibers made from the creped cellulose wadding are applied. This layer, the base layer, preferably had a basis weight of about 5.9 g / m ² and a weight of about 6.8 to 20 g / m ² before creping. When holding about 25 mm long viscose fibers with a creping of this layer (during the decrease of 40 denier value 1.5. The fibers were about 90% of the dry area of the paper machine) is expediently aligned parallel to the machine direction. The two-layer fiber web resulting in a crepe ratio of about 1.1 to 2.5 was assumed. Furthermore, the wet strength of the base voltage can be guided around a heating roller which is coated with melamine-formaldehyde resins, urea-45, for example by adding a temperature between about 160 and 165 ° C. On this heat roller, formaldehyde resins, polyalkylene-polyamine resins, practically complete setting of the adhesive, or similar plastics to pulp, resulted. The synthetic top layer was increased upon completion. If a treatment has taken place to increase the wetting of the setting process by means of a calender strength, it can expediently be a roller in the manner described above, and a treatment with conventional adhesive is also pressed into it.

nellen wetting agents to carry out the two-layer

The fibrous web that appeared when wet strength increased was tested in an Instron testing machine Reduction of the absorption capacity of the base - its tensile strength tested. Their ultimate breaking point was in to compensate shift again. in the machine direction at 52.5 g / mm and across

The base layer should preferably be 55 machine direction at 3.8 g / mm,
have an open, perforated structure, so that the As a comparison material, a similar two-finished, two-layer fiber web was produced quickly and easily from layered fiber web, which, however, can be penetrated as liquids. In order to achieve this to the top layer instead of the highly drawn web, the cotton wool web in the paper maize synthetic fibers can only be used in the usual manner on a patterned or in a special 60-dated web, in which only about 60% of the screen fabric is woven or the fibers were oriented in the machine direction but after being made with a needle roller. The basis weight of the carded web must be perforated. But it can also be a normal one, carried about 6.1 g / m ² . The wad layer produced in the usual way with this carded web without any further produced two-layer fiber web possessed in the teres use. 65 machine direction has a tensile strength of

Furthermore, after the crepe, the base layer should be 18.5 g / mm and cross machine direction pen must be stretched and ironed, up to a breaking point of 5 g / mm.

1 sheet of drawings 309 514/417

Claims (2)

1 2 the orientation they differ from the usual patent claims: Chen carded webs in which only about 50 to 70% of the fibers are parallel to the machine direction. 1. Two-layer fiber web made from non-woven fabrics. ten fibers for use as a cover layer for 5 The use of highly warped and sanitary napkins, diapers, tampons and the like, ideally equally light fiber webs as a cover made of a base layer and one with it for sanitary towels, diapers, tampons Adhesive-connected top layer, etc. has not been possible in practice so far, characterized in that the bases, since it has turned out to be extremely difficult to remove from creped cellulose wadding, have a basic weight of 6.8 up to 20 g / m ² in the improper, parallel-lying fibers sufficiently well creped and a crepe ratio to combine without the moisture from 1.1 to 2.5, the top layer being made of permeability, the supple feel and the molded synthetic fibers a denier of durability of the material will be lost. The 0.5 to 3 formed thin layer with a 15 bond of the fibers is usually done by a basis weight of 2.5 to 20 g / m ² , at which the gluing. Based on the only low weight sol fibers 80 to 95% straight and parallel, rather webs are directed and extended to their full length, amount of adhesive required to hold the webs in and the adhesive in itself to bring in a known manner is sufficient for the practical operation of a regular shape, open pattern 20 superiors strength>. With an increasing amount of is seen, with the base layer and the top adhesive, the webs become increasingly stiff, layered by the adhesive only in the areas defined by the loss of the desired supple feel, the patterns are connected to one another and the moisture levels are significantly reduced Fibers of the top layer through permeability and also increase, as a result of unre-embedding in the adhesive, are bound and kept in their regular permeation of the adhesive to the rer orientation. Exterior surfaces, an unfavorable appearance. Everything 2. Fiber web according to claim 1, characterized in that the stands on a covering layer for sanitary towels indicates that the adhesive contravenes at least some of the requirements. Also are has wisely penetrated the base layer, possibly non-bonded fiber webs made of highly warped, rend the fibers of the top layer only partially in 30 very thin synthetic fibers (denier value of embedded the adhesive and their outwardly 0.5 to 3) extremely sensitive. When on facing surfaces are kept practically adhesive-free, such sheets are e.g. a heat-setting adhesive. medium is applied, it is very difficult during the application to the setting of the adhesive 35 by means of an even tension in the web maintain. The use of thermoplastic adhesives will be light, because of the stickiness of the adhesive on the applicator roller, fibers The invention relates to a two-layer fiber pulled out of the web that has high orientation web of non-woven fibers for use as 40 of the individual fibers destroyed and the uniform Covering layer for sanitary towels, diapers, tampons, interrupted web structure. Although this can and the like, consisting of a base layer and a mangle by temporarily binding the webs so connected by means of an adhesive upper- when leaving the stretching machine with a subsequent layer. reduce slightly washable adhesive, On fiber webs, e.g. as a covering layer or 45, the product is only lower Top layer for sanitary towels, diapers, tampons, strength across the machine direction, and the like serve, several important requirements are taken from the German interpretative document posed. In particular, they must be as thin as possible, 1,076,075 already multilayered fiber webs (so-called be tear-resistant and moisture-permeable, a so-called composite fleece), which consists of a textile supple handle, good dimensional stability 50 fiber layer (e.g. a viscose cardigan fleece) and and are well tolerated by the skin, and they should consist of a layer of cellulose wadding and the like len also have a pleasant appearance. be established that the one, serve as a carrier- Since synthetic monofilaments and the resulting layer immediately after a full-surface attendant Fibers of staple length are known to be whipped with glue the other layer Already tried often to get fed from it in an economical 55 tension-free and both layers on-way very thin and light fiber webs to be produced are solidified under pressure without pressure, len which are suitable as such cladding layers. The other layer can also be looser in shape have highly warped webs of natural fibers in free fall onto the staple fibers beauf with adhesive (e.g. cotton) or synthetic whipped carrier layer can be applied. Such Fibers (e.g. viscose, acetate, nylon, polyester, 60 composite nonwovens are very beneficial as a material for Acrylonitrile and the like) having a denier of 0.5 are disposable, but are not up to 3 a preferred interest because they are very much suitable as a covering layer for sanitary towels or the like, have higher tensile strength than usual carded The invention is based on the object of high-webs. Under the term »highly warped fiber - warped light fiber webs for production webs «are understood to mean webs whose fibers can be used in the covering layer of sanitary towels and the like a stretching machine so largely in parallel and using such a high-performance are that about 80 to 95% of the fibers in Mazogener light fiber webs are two-layered machine direction lie. To this great extent to create web, which all to a covering layer for