WO2000066056A1

WO2000066056A1 - Hygiene product comprising a film with a nap arrangement

Info

Publication number: WO2000066056A1
Application number: PCT/EP2000/003868
Authority: WO
Inventors: Werner Wagner; Thomas Allgeuer
Original assignee: Hcd Hygienic Composites Development Gmbh; Dow Europe S.A.
Priority date: 1999-04-28
Filing date: 2000-04-28
Publication date: 2000-11-09
Also published as: EP1189561A1; AU4753100A; DE19919397A1

Abstract

The invention relates to a method and device (205) for producing a film (200) comprising fibrous web which is located on at least one side and which consists of a nap arrangement in order to produce a hygiene product. The naps were worked, in an integrated manner, at least from the film material located on the surface merely by pressing and generating pressure in openings of a matrix, alone or by using a calender (220) and by the subsequent withdrawal thereof.

Description

Hygiene product with a film with hair arrangement

The invention relates to a method for producing a hygiene product, a hygiene product manufacturing device and a hygiene product, wherein a film is used which has a fibrous web.

From the post-published DE 198 43 109 A1, for example, a textile backsheet for the hygiene sector is known which has a fibrous web.

Hygiene products known from the rest of the state of the art, such as disposable diapers and sanitary napkins, have an upper side, there called a top sheet, and a lower side, there called a backsheet, between which an absorbent layer is arranged. The so-called top sheet, that is to say the top layer of the hygiene product facing the body, is usually designed in such a way that it is permeable to liquids. The so-called backsheet, that is, the layer of the hygiene product facing away from the body, on the other hand, is usually impermeable to body fluids. The absorbent layer is an absorbent insert, for example made of cellulose, natural fibers, synthetic fibers, wool or cotton wool, which can additionally contain superabsorbents. Such a product is known for example from DE 92 19 163.

Proceeding from this prior art, therefore, the task arises, on the one hand, of providing a hygiene product which can be produced simply and inexpensively and in which the top side, the top sheet, and optionally the underside, the back sheet, in addition to their barrier properties, have further advantageous properties have, for example, a textile handle and are aesthetically pleasing and skin-friendly. On the other hand, a rational method for producing a hygiene product and a corresponding hygiene product manufacturing device should also be provided. This object is achieved with a hygiene product with the features of claim 1, with a hygiene product manufacturing method with the features of claim 22 and with a hygiene product manufacturing device with the features of claim 31. Advantageous further developments are specified in the subclaims.

A hygiene product according to the invention has at least one structure consisting of top sheet, back sheet and absorbent layer, in which the top sheet contains a film made of a thermoplastic, and preferably consists of such a film. The topsheet film has a fiber web on one side (surface), which was integrated into the surface material of this film. The surface of the top sheet equipped with the fiber pile is preferably located on the side facing away from the absorbent layer. Under conditions of use of the hygiene product, the surface of the top sheet of the fibrous web is on the side facing the body of the user. The top sheet is provided with continuous perforations which, under conditions of use, allow liquids, in particular body fluids, to penetrate in the direction and preferably only as far as the absorbent layer. The topsheet film is preferably multi-layer, that is to say at least two layers. According to one embodiment, the backsheet has no perforations and is impermeable to liquids.

Preferred is a hygiene product in which the topsheet is designed as described above and the backsheet comprises or preferably consists of a single-layer or preferably multi-layer film made of a thermoplastic. In this preferred embodiment, the backsheet film has a fiber web on at least one side and thus the surface, which is integrated from the superficial material of this film. This surface of the back sheet, which is equipped with the fiber pile, is located on the Absorbing layer facing away Under conditions of use of the hygiene product, the surface of the back sheet characterized by the fiber pile is on the side facing away from the body of the user or wearer

The topsheet and backsheet films can each - independently of one another - be single-layered, or preferably have multiple layers. The topsheet and backsheet can be identical in structure and composition and differ, for example, only in that the topsheet is perforated. In another embodiment of the present invention, topsheet and backsheet constructed differently and differ, for example, in the type and number of layers used, composition and / or configuration of the fiber pile. The backsheet can be breathable or water-vapor permeable

The so-called fiber pile or harp pile, which characterizes the surface of the top sheet and, if appropriate, also the surface of the back sheet, is formed from a large number of fine, essentially upward-facing hairs which consist of the same thermoplastic material as the film layer lying on the surface of which the hairs were formed. Film surfaces with 2000 to 12,000 individual hairs per square centimeter have proven to be advantageous. The hairs preferably have a diameter of approximately 20 micrometers (μm) to approximately 140 micrometers, with a diameter of approximately 20 to approximately 80 micrometers being particularly preferred The length of the hair is advantageously in the range from approximately 80 micrometers to approximately 800 micrometers. Depending on the type and function of the hygiene product, the fibrous web, in particular the fibrous web of the topsheet, can contain additional substances, for example (skin) nourishing, disinfecting, odor Absorbing, odor-inhibiting and / or fragrance-emitting nature contain Suitable substances include cosmetics, odoriferous or odorous substances and ointments The fleece gives the topsheet a velvety or velor-like surface that, when in contact with the skin, feels textile-like and particularly pleasant to the user, especially when compared to a smooth or only embossed plastic film. The areas of the topsheet surface that are used with the body are in the hygiene products or the skin of the user (for example in the case of bed inserts) or the wearer (for example in the case of diapers or feminine hygiene articles) of the user is preferably substantially completely covered with the pile of harps

Hygiene products with the structure described here are usually disposable items and are not intended for repeated use. Such hygiene products have the function of absorbing and holding body excretions, in particular liquid body excretions such as urine, blood, sweat, and are in use with the body of the user or wearer Constant contact Preferred hygiene products are feminine hygiene articles, in particular sanitary napkins or sanitary napkins and panty liners, wound dressing or wound covering material, bed liners and in particular incontinence articles such as baby diapers, adult diapers or adult incontinence pads

In addition to a structure with a liquid-permeable, perforated topsheet with a fiber pile surface, an absorbent intermediate layer and a liquid-impermeable backsheet, preferably also with a fiber pile surface, the hygiene products can also contain further structures, elements or agents, in particular structures, elements or agents that support the function, for example agents for attaching the hygiene product or parts thereof, means for holding the hygiene product or parts thereof together, an elastic cuff or a lateral leak protection or leg leak protection The fibrous web is preferably present where there is direct, permanent body contact with the user of the product Possibility, that the fiber pile surface is at least partially covered with a material. The material can originate, for example, from another product which is brought into contact with the hygiene product.

Under conditions of use, the topsheet or the cover layer forms the surface of the hygiene product facing the body of the user - for example in the case of bed liners - or wearer - for example in the case of diapers, panty liners or sanitary napkins - usually with skin contact. This topsheet is a single-layer or a multi-layer plastic film which is provided with the fiber web described on the surface facing the body of the user or wearer. The plastic film consists of a thermoplastic polymer or of several different thermoplastic polymers and advantageously does not contain a nonwoven fabric.

Suitable polymers are, for example, polylactate (PLA), polyamides, polyvinyl alcohols, polyesters, polyether esters and polyester amides and in particular polyolefins, and also mixtures thereof. Preferred polyolefins are propylene homopolymers and / or copolymers and in particular ethylene homopolymers and / or copolymers. Preferred ethylene copolymers are copolymers of ethylene with one or more aliphatic alpha-olefins with between three and twenty carbon atoms, in particular butene, pentene, hexene or octets, ethylene-styrene copolymers, copolymers of ethylene with an ionomer, ethylene copolymers with vinyl acetate or ethylene Copolymers with acrylic acid (acrylate).

The polymers for the top sheet are advantageously selected so that the top sheet is soft and stretchable.

Multi-layer topsheets or topsheet films are in particular two, three, four and five-layer plastic films, the individual layers being able to have the same or a different composition. Advantageously, the perforated plastic film used for the top sheet has a specific weight of approximately twenty to eighty grams per square meter.

The top sheet of the hygiene product is perforated. Perforations mean, for example, holes, slits or other regular or irregularly shaped openings. Accordingly, perforating is understood as a process for the production of these openings. The perforation of the top sheet is continuous, i.e. the perforations extend through the entire thickness of the top sheet as channels that flow through the liquid. For a given top sheet, the size and / or the density of the perforations can be variable. For example, edge areas of the top sheet, if they play only a minor role in its functionality, may be imperforate or have only a few and / or smaller perforations. Areas that are subject to greater stress and are particularly important for functionality (high impact zone) may have larger perforations and / or a higher density of perforations.

The absorbent layer has the function of physically and / or chemically binding body fluids. In the hygiene product, this layer is arranged between the top sheet and the back sheet. Suitable materials for producing this layer are known and include, for example, cellulose, natural fibers, synthetic fibers, wool, foam or cotton wool. To increase the absorbency, the layer can contain suitable additives, for example superabsorbents.

The backsheet or the underlayer of the hygiene product forms the side facing away from the body of the user or wearer under conditions of use. This side can also come into contact with skin when handling the hygiene product, for example when putting on a baby diaper with the skin of the person changing it. A velvety and Velor-like surface and a good grip are therefore advantageous for a backsheet. The backsheet of the hygiene product is essentially impermeable to water. In the preferred hygiene products, the backsheet comprises or consists of a single or multi-layer plastic film. This plastic film consists of one or more different thermoplastic polymers. Suitable polymers are, for example, polylactate (PLA), polyamides, polyvinyl alcohols, polyesters, polyether esters and polyester amides and in particular polyolefins, and also mixtures thereof. Preferred ethylene homopolymers and / or copolymers, for example those mentioned herein, and in particular propylene homopolymers and / or copolymers.

The polymers for the backsheet are advantageously selected such that the backsheet has high tear strength, puncture resistance and, if desired, for example in the case of baby diapers, abrasion resistance. With a suitable choice of materials, the backsheet helps to fix the hygiene product on a given surface. For example, the backsheet of a feminine hygiene article is designed in such a way that it supports its fixation in the slip, or the backsheet of a bed insert in such a way that it prevents slipping in bed or at least makes it difficult.

Multi-layer backsheets are in particular two, three, four or five layers

Plastic films, where the individual layers can have the same or a different composition.

Advantageously, the plastic film provided with hair pile used for the backsheet has a specific weight of approximately 20 to 100

Grams per square meter.

In a preferred embodiment, both the top sheet and the back sheet of the hygiene product have a fibrous web. The hairs that make up the fiber of the backsheet can be longer than that

Hairs that make up topsheets. The fiber web covers at least partial areas of the respective film surface (s). If desired, the respective film surfaces are essentially completely covered with fiber web

Disposable or so-called disposable hygiene products can be manufactured and used in large numbers, whereby in addition to the functional properties, a special skin tolerance is guaranteed

Furthermore, it is proposed that for the production of a film with at least one side of a pile of fibers from a harp arrangement, the hairs are integrated, at least from the film material lying on the surface, by pressing into openings in a die solely by means of a calender and subsequent removal, for this purpose the film is made of thermoplastic material in contact with the die in heated condition The calender exerts such pressure on the heated film material that it at least partially penetrates the openings of the die. Surprisingly, it has been found that even with very fine openings, evacuation of cavities in the die is not necessary is to create a hair film Rather, the calender exerts such pressure that after the film has been removed from the die, the hairs formed have reached their final shape. You do not need to be further processed, but can be in their dimensions such as how they are shaped, used or further processed, for example in the form of applying a coating or other. The material used for the film is preferably such that a temperature effect on the dimensioning of the hairs and the arrangement of the teeth causes only insignificant, negligible changes, apart from the start of melting of the hairs when the melting temperature is exceeded In the selection of the film material, the use of a thermoplastic material has proven itself, in which the polymer used was produced by the metallocene process. The properties associated with this are favorable when producing the hairs. According to a further development, a film is used which remains largely dimensionally stable when energy is supplied up to the softening temperature. This means that, unlike a thicker film, the film retains its dimensions. In particular, the film has no foaming agent in the area of the hair, which would lead to an increase in volume when heated. Rather, it has been found that when a sufficiently high pressure in the calender nip is set with a corresponding setting of the speed of the film passed through the nip, the pressure in the openings is so great that the pressed-in material takes on the shape of the cavity.

A further development provides that the film is pressed into cylindrical cavities to form the hairs and is pulled off from them. The final diameter of the hairs is preferably between approximately 5 μm and approximately 80 μm, but is at most as large as the diameter of the cylindrical cavities.

In order to obtain a high degree of dimensional accuracy, the method can be adapted so that the hairs are stretched at most by a third of their length, in particular in such a way that only a stretching of at most 10% occurs. For this purpose, the withdrawal angle from the surface of the die can be set variably. The speed of rotation of the calendered roller provided with cavities serves in particular as a parameter for setting the take-off angle. Increased accuracy is obtained if the prevailing pressure in the calender nip is taken into account and material parameters are used depending on, for example, the processing temperature. This enables map-controlled production, with a map generated with respect to a material using corresponding adaptations can be adapted to different calender systems. The film is preferably lifted off the die at an angle between 5 ° and 75 °

The functional property of the film can be influenced by different processing stations. For example, a perforated film with a rake arrangement is achieved by connecting a corresponding perforation station. The manufacturing process is accelerated if the processing station is built inside the calender alongside mechanical perforation it is possible to extract an extractable substance, for example, by stretching the film. A corresponding station, such as a roll designed for stretching, can also be switched internally. There is also the possibility of designing the film, which is provided with a harp arrangement, in terms of color, for example by printing Printing is preferably carried out on the surface provided with the hairs, the printed surface also being able to be post-treated. For example, a fixing agent is applied after the printing the film is fed into a suitable device, which allows printing, preferably over the entire width of the film web. Depending on the intended use, commercial ink, such as is also used in inkjet printers, is suitable for printing. Inkjet printing also enables the film to be printed in color

Equipping at least one of the two sides of the hygiene product with a film with a rake arrangement and a printed surface results in increased softness for the user of the hygiene product in this area, as well as a calming effect, for example on toddlers, due to a suitable selection of motifs. Undesired skin reactions due to those which are otherwise perceived as disturbing Material surfaces can thereby be avoided in a targeted manner. In particular, the film with the rake arrangement is also suitable for products prolonged skin contact or regularly recurring skin contact

It is advantageous if topsheet and backsheet are made essentially from the same material, namely from a single or multi-layer film made of a thermoplastic material, with a fibrous web located on at least one side, which has been worked out integrally from the superficial material of the film, whereby the film used for the topsheet is provided with perforations located within the fiber web, which allow water and aqueous solutions to penetrate the film due to capillary forces and / or normal flow behavior, but the film used for the backsheet does not have these perforations

The particular advantage of the above-mentioned arrangement is then that in an online process no different films have to be kept for the topsheet and the backsheet, but rather a practically untreated film can be used as the backsheet film, while the topsheet film with corresponding perforations is provided

Furthermore, the film provided with a rake arrangement can also be used only in partial areas of a hygiene product, for example in those areas which have skin contact when the product is used

A method of manufacturing the film that is possible for the product includes, for example, the following process steps

A thermoplastic material is melted or in the form of a film on a surface which is adjustable in temperature and which, compared to the desired structure, is worked out as a negative structure (matrix) with a low tendency to adhesion compared to the plastic material and with numerous fine cavities in the form applied by blind holes and kept at melting temperature at least in the contact area with the surface,

- by pressure on the plastic material, it is pressed into the cavities with compression of the remaining volume in the cavities, so that the matrix is filled, but the cavities are only partially filled by the thermoplastic material,

the deformed thermoplastic material is solidified by cooling, still on the surface, whereby it assumes the corresponding surface structure on the side brought into contact with the surface,

- The pressure on the plastic material is released, as a result of which the plastic material at least partially prints out into the compressed air inside the cavities, the solidified plastic material is removed from the surface as a structured film, the thermoplastic material introduced into and drawn from the cavities forms a pile consisting of protrusions and nubs

In this way, a semifinished product structured on at least one side can be created, in which the projections have reached hair fibers

The hairs forming the pile could also be stretched by combing, brushing, squeegee and / or shear crushing, and on average the length of the projections of the pile could be increased by at least twice the original length

Another method for producing the film provides that the thermoplastic material in at least above the Softening temperature in the heated state in openings of the matrix is pressed by means of a calender system to the extent that it is solidified in the openings so that when it is pulled out of the openings it is at least slightly plastically deformed to form the hairs.

Another method provides that the thermoplastic material, when heated at least above the softening temperature, is pressed into openings in the matrix by means of a calender system and is solidified in the openings to such an extent that it hardly needs to be deformed when pulling off the openings to remove the hairs to build.

When the thermoplastic material is peeled off, it is possible to influence the formation of hairs by the angle at which speed of rotation and thus the transport speed of the film, the film is pulled off the matrix. Other influencing factors are the dwell time on the roll and the force with which the film is pulled off the matrix. The formation of hairs can also be influenced by heating the film. The heating can take place via direct heat conduction, for example from the matrix to the film, or indirectly by means of radiation such as microwaves or ultrasound or other energy supply such as, for example, by convection.

Suitable materials for the film are polyolefins or copolymers in which at least one of the polymers is a polyolefin. Other thermoplastic materials, such as polyamides, such as polyvinyl alcohols, polyesters, polyether esters or polyester amides, can also be used for production.

Film surfaces with 2000 to 12,000 individual hairs have proven to be advantageous, the hairs preferably having a diameter of 20 to 80 μm and a length of 80 μm to 800 μm. When used in For products with direct skin contact or contact with objects, the hairs should be dimensioned as follows: average diameter 40 μm to 60 μm, length 100 μm to 240 μm, density of the hairs between 280 and 550 hairs per square centimeter

The invention is explained below with the aid of a few exemplary embodiments. The drawing used as the basis shows in its figures

1 shows a schematic representation of an incontinence article in a top view, partly in section,

Fig. 2 is a schematic plan view of a top sheet film and one

Backsheet film in comparison,

3 shows a schematic diagram of a hygiene product manufacturing device

example 1

An LDPE film with a thickness of 100 .mu.m is provided with hairs on a heated roller at a temperature of 120 to 150.degree. C., which is provided with cavities, in a density of 3000 hares / cm ² with the aid of brush rollers longer hairs are drawn from the hairs on the surface of the foal, which have an average diameter of 40 μm and a length of 80 to 500 μm. The resulting pile is present on one side and gives the film a vhes-like surface on this side. The process depends essentially on the method of operation described in patent application 198 43 109. The disclosure of this document is used in full

To produce a disposable diaper 100 (see FIG. 1), an essentially liquid-impermeable outer layer, here referred to as backsheet 20, is required.The layer lying on the body is referred to as top sheet 30. The latter is liquid-permeable. There is a layer between films 20 and 30 Absorption layer 40 Top and back sheets 30 and 20 are connected to one another at the outer edges, see above that the absorption layer is enclosed in the manner of a pillow between these films. Furthermore, holding parts 36 and stabilizing parts 60 and 62 are present

In this example, the top and back sheets consist of the same film described above, but immediately before the incontinence article is manufactured, the top sheet is provided with numerous fine perforations I using a spiked roller, which have an average diameter of 2 mm and a density of 15 perforations / cm ² with an even distribution, so that the hairs, which are on the outside of the top sheet, absorb the liquid first and guide it to the perforations, under which the absorption mass lies directly, so that the liquid migrates into the pillow due to the capillary forces

The film used for the backsheet is the same film as for the topsheet, but without the perforations

The differences are shown schematically in FIG. 2, in which a film with perforations is shown on the left side and an identical film without perforations is shown on the right side

Example 2

A multilayer film with a thickness of 60 μm is produced on a double extruder system, the more easily deformable top layer of the film having a thickness of 30 μm and the support layer also having a thickness of 30 μm. A mixture of two polymers of different densities is used for the top layer are two metallocene-based polyolefin products sold under the brand name Affinity ™ Polyolefin Plastomer (POP) by The Dow Chemical Company In the aforementioned polymers, a mixture of 30 parts of Affinity ™ HM 1250 with a melt index of 30 g / min and a density of 0.885 g / cm ³ and 70 parts of Affinity ™ HM1100 with a melt index of 18 g / min is used. The mixing ratio can also be reversed.

An LLDPE is used for the carrier layer, which has a melt index of 1 and a density of 0.916 and which can be obtained from The Dow Chemical Company under the name ELITE ™ 5400 EPE (Enhanced Polyethylene).

Lubricants, pigments, stabilizers and release agents are also added to the film in a content of up to 10 percent by weight. The film is produced using the so-called chill-roll process. The film is then fed to a system having a matrix roll and a rubber roll, and is formed in the gap formed between these rolls.

The matrix roller is made of steel and has, for example, 1000 to 4000 blind holes per cm ² . The blind holes have a diameter of 60 μm and a depth of 400 μm. The rubber roller consists of a

Steel roll core with a jacket made of temperature-insensitive

Fluororubber is provided. The matrix roller is brought to 140 ° C. The

The rubber roller is cooled. After the polyethylene film has passed through the nip, 3000 hairs per cm ^{2 have been} formed. The hairs are crushed by shear pressure

Extension process fine fibers with more than twice the length of the

Knobs pulled. After the process has been carried out, a textile-like film is obtained which can be used for a backsheet and in a perforated version for a topsheet.

Example 3 A polypropylene film with a thickness of 60 μm and a melting range of approximately 180 ° C. is laminated together with a polypropylene-polyethylene copolymer film with a thickness of 80 μm and greater rigidity than the first-mentioned film. The harder film is to do this in a known manner Slotted nozzle extruder manufactured and drawn off from a supply roll, while the softer film is immediately applied in the melt-flow state from an extruder via a slot die to a roller. The roller is provided with cavities that have hairs on the softer film with a rake density of 5000 rakes / cm ² produce At the same time, the stiffer film is brought up to the roller and laminated with the softer film to form a two-layer film

Brush rollers and doctor blades, as described in German patent application 198 43 109, produce hairs with a length of 80 to 100 μm, which have a diameter between 10 and 60 μm

A thin, superabsorbent sanitary napkin is made from the film, in which a thin cellulose superabsorbent layer between two films is held like a pillow. The topsheet, i.e. the film that is close to the body, is 7 mm thick with fine perforations with a diameter of 7 μm of 100 perforations / cm ² , which are introduced with the aid of a laser. The backsheet was used without these perforations

Example 4

The film, which is provided with a velor-like surface, is subjected to a special stamping perforation. A tool is used for this purpose, which consists of a needle roller with approximately 15.4 needles per cm ² with a needle diameter of 2 mm and a free-standing, working tip of 5.5 mm long and a counter roller, which is designed as a matrix roller, works as A steel roller is used for the matrix roller, which can be cooled and heated.The steel roller has a jacket made of fluororubber The surface made of fluororubber is about 5 mm thick. A powerful laser is used to drill holes in the fluororubber layer. The needles of the needle roller engage in these holes Matrix roller also has 15.4 holes per cm ^2. When the tool is closed, the needles in the mat part run according to an involute curve

The matrix holes have an opening of 1.9 mm and have a depth of 2 mm. The perforation is in the form of Matπx-Patrix projections or perforations. The needles push the film into the opposite openings, stretch the film to breakage and open it the film finally At a needle roller temperature of 60 ° C, the film is permanently shaped, that is, stretched

The perforated film retains the fine fiber structure on its surface. At the same time, it takes on the three-dimensional shape formed by needle stretching

The desired velor-like film is produced, which shows frustoconical depressions that are open at the end. This results in a well-suited coverstock or topsheet material, which can also be used with other products

The surface of the film is soft to the touch like a textile, the impinging liquid is forced into the conical depressions and fed through the openings to the absorbent layers underneath

The return of the liquid to the surface, also called "rewettmg", is prevented by the fine valve-like openings at the cone tips of the film. The forming or perforation of the velor film takes place at around 60 ° C, since at this temperature there is neither undesirable changes to the film itself, the fine velor fibers are destroyed.

The perforations can be reduced as well as enlarged and can be arranged functionally or aesthetically as desired in the particular case.

Another type of perforation is created by stretching the film material. For this purpose, the film material has, for example, polypropylene with chalk and / or a beta nucleating agent. The nuclei agent is preferably added in a concentration of between 0.1 ppm to 100 ppm and extracted before stretching, in particular stretching the film. In addition to chalk, other fillers can also be added to the thermoplastic film material. In addition to fillers, it is also possible to add miscible additives that separate out during crystallization. Due to the phase separation that occurs, openings arise in the film material. An extractable substance can thus be arranged in the film in such a way that openings are formed in film areas of adjacent hairs when the substance is extracted from the film. In particular, tests have shown that mixing the thermoplastic material to be extruded with the substance does not interfere with hair formation by being pressed into the die opening. For the extraction, for example, the film is stretched, as a result of which the openings are created between hair roots of the hair arrangement in a predetermined manner.

A thin, superabsorbent sanitary napkin is made from the two films, i.e. from the velor backsheet version and from the perforated topsheet film, in which a thin cellulose superabsorbent layer is held like a pillow between the two films . The topsheet, i.e. the film that lies in the area close to the body, has fine perforations with a diameter of 2 mm and a density of 14 to 16 perforations / cm ² The velor film without the perforations mentioned can be used as a backsheet

Furthermore, the hairs are tapered in the shape of a truncated cone at least at their tips.The truncated cones are regularly arranged in rows and are spaced about 120 μm apart from one another in relation to their respective center point.The truncated cones have a diameter of approximately half their height of 140 μm in size from 60 μm to At the base, i.e. at the root of the truncated cone, which merges into a region of the film that has just remained, the hairs have a diameter of approximately 80 to 100 μm. At the tip of the truncated cone, the diameter is approximately between 30 μm and 45 μm The truncated cones are roughly straight, but can also be slightly inclined to one side. The truncated cone itself is slightly curved, with the curvature pointing towards the inside of the truncated cone. An open truncated cone edge is furrowed and has an irregular structure that the truncated cone in ih Rem interior are partially hollow, with the frustum of the cone open at the top having a jagged, almost crown-like shape

FIG. 3 shows a possible way of processing a film 200 by means of a hygiene product manufacturing device 205, whereby not all processing stations, such as for example for joining the top and bottom of the hygiene product, are shown. Thermoplastic material 210 is transformed into a prefabricated film 200 from a feed device 215 Calender 220 guided The calender 220 has a first roller 230 and a second roller 240. The first roller 240 has openings 245, which are followed by cavities 250. A surface 260 of the first roller 240 preferably has a coating which has an extremely low tendency to adhere to the The film 200 is partially pressed into the cavities 250 as it passes through the calender gap 270 in order to to form the harp arrangement The cavities 250 are preferably designed to have a cylindrical shape in at least a predominant section. The film 200 is correspondingly heated in the device 205 shown, in that the film 200 is guided on the first roller 230 along a wrap angle between 25 and 90 ° until it reaches the calender gap 270 However, the film is only heated up to a maximum just below the melting temperature by means of the first roller 230, preferably up to or slightly above the softening temperature. After passing through the calender gap, the film 200 preferably remains below for a wrap angle of between 15 ° and 130 ° 90 °, on the first roller 230 During this wrapping, the 200 can be cooled or, if desired, heated even further, for example to be cooled only afterwards

Adjacent to the first roller 230 is a third roller 280 as a pull-off device 290. The pull-off device 290 is preferably movably arranged around the circumference of the first roller 230. This makes it possible to set a desired wrap angle depending on the thermoplastic material and processing speed. The pull-off device 290 allows that the film 200 is removed at a pull-off angle between 5 ° and 75 ° from the first roller 230. However, the pull-off device 290 can also be designed in such a way that pull-off angles beyond 75 ° can be achieved. On the one hand, the pull-off angle can be influenced via the diameter of the third roller 280, but also on constructive measures

According to a further development, the pulling device 290 includes a further fourth roller 300, which is shown in dashed lines. The third 280 and fourth 300 rollers are arranged such that they can move with respect to one another. The pulling angle can also be changed during operation. The pulling angle itself, which is indicated as a double arrow, is like defined as follows: it includes the angle between a first tangent to the first roller 230 and a second tangent to the third roller 280. The first tangent runs through the point at which the film on top of it lies last against the first roller 230. The second tangent passes through the point on the third roller 280 where the film 200 has the last contact on the third roller 280. Two pull-off angles are shown, which indicates that the pull-off angle can be changed.

At least one further processing station 310 is connected downstream of the pull-off device 290. In this case, the further processing station 310 is a device for designing the color of the film, for example by means of printing. The processing station can also

310 be an expansion device. In this film 200 is used to build up

Perforations or corresponding material properties, as are possible by overstretching, are treated accordingly. A further processing station in the form of a matrix-patrix perforation system 320 is connected upstream of the device for color design. This system 320 has a needle roller 325 and a matrix roller 330 and is used for perforating the

Films 200

Claims

Expectations

1 hygiene product with a liquid-permeable top (30), which is intended for permanent skin contact, and with a preferably liquid-impermeable bottom (20), an absorbent layer being arranged between the top (30) and the bottom (20), characterized in that that the top (30) has a multilayer, perforated film (200), the top layer of which is wholly or partly covered with a fiber pile, the film having a harp arrangement which is worked out from the top film layer

2 hygiene product according to claim 1, characterized in that the underside (20) has a vapor-permeable and liquid-impermeable multilayer film which is covered with a fiber pile

3 hygiene product according to claim 1 or 2, characterized in that the underside (20) has a multilayer, imperforate film, the top layer of which is wholly or partly covered with a fiber pile

4 hygiene product according to one of claims 1 to 3, characterized in that the hygiene product has a first and a second side, each having a film (200) with a harp arrangement

5 hygiene product according to one of claims 1 to 4, characterized in that the harp arrangement of the first side has a different length than that of the second side

6 Hygiene product according to one of claims 1 to 5, characterized in that the top (30) and / or the bottom (20) have at least one strip with the film with a fibrous web

7. Hygiene product according to one of claims 1 to 6, characterized in that the hairs (2) making up the pile of the underside (20) have a length of 100 microns to 400 microns, and the hairs making up the pile of the top (30) ( 2) have a length of 50 microns to 150 microns.

8. Hygiene product according to one of the preceding claims, characterized in that an additional substance is applied to the fibrous web.

9. Hygiene product according to one of the preceding claims, characterized in that at least one substance with a skin-care effect is applied to the fiber web of the upper side (30).

10. Hygiene product according to one of the preceding claims, characterized in that a hair (2) has an approximately crater-like shape at its tip, which is at least partially hollow in its interior.

11. Hygiene product according to one of the preceding claims, characterized in that the fibrous web of the underside (20) fixes the

Hygiene product supported on a contact surface.

12. Hygiene product according to one of the preceding claims, characterized in that the top layer of the upper side (30) is only partially covered with the fibrous web and a connecting means is arranged on a surface section without fibrous web of the upper side (30), in particular adhesive is applied.

13. Hygiene product according to one of the preceding claims, characterized in that it is an incontinence product.

14. Hygiene product according to one of the preceding claims, characterized in that it is a bed insert.

15. Hygiene product according to one of the preceding claims 1 to 14, characterized in that it is dressing material, in particular a wound dressing, or wound covering material.

16. Hygiene product according to claim 15, characterized in that the hairs (2) of the fibrous web of the wound dressing or the wound covering material have a different length in the wound contact area than outside the wound contact area.

17. Hygiene product according to claim 16, characterized in that the fibrous web has a length of 50 to 150 microns in the wound contact area and outside of this area has a length of 0 to 80 microns.

18. Hygiene product according to one of the preceding claims, characterized in that the top (30) and the bottom (20) are made essentially from the same material, namely from a single or multilayer film made of a thermoplastic with one on at least one side located fibrous web, which was integrated from the superficial material of the film, whereby the film used for the top (20) is provided with perforations (1) below the fibrous web, but the film used for the underside (30) has these perforations ( 1) does not have.

19. Hygiene product according to one of the preceding claims, characterized in that the hairs (2) have a diameter of approximately 5 μm to approximately 80 μm, in particular an average diameter between 40 μm and 70 μm.

20. Hygiene product according to one of the preceding claims, characterized in that the hairs (2) have a length of 80 to 800 microns, preferably a length between 110 microns and 400 microns, in particular between 130 mm and 190 microns.

21. Hygiene product according to one of the preceding claims, characterized in that the film (200) is printed.

22. Hygiene product manufacturing method, in which a film (200) is used, which comprises a thermoplastic polymer and is further processed into a hygiene product, characterized in that a fibrous web is produced on at least one side of the film from a hair arrangement, with hairs (2) integrated at least from the superficial film material only by pressing, pressure generation and cooling into cavities (250) of a die by means of a calender (220) and subsequent removal of the film material adhering to the cavities (250) are worked out and whereby the top (30) is intended for permanent skin contact.

23. The method according to claim 22, characterized in that the film (200) is drawn off in such a way that the hairs (2) are stretched at most by a third of their length, in particular in such a way that only a stretching of at most 10% occurs.

24. The method according to claim 22 or 23, characterized in that a pulled-off hair (2) assumes an approximately crater-shaped shape at its tip.

25. The method according to claim 22, 23 or 24 for perforating the film (200) with a hair arrangement, characterized in that at a temperature below that at which there is a destruction of the hairs (2) comes, a matrix-patrix perforation with a needle roller (325) against a perforated matrix roller (330).

26. The method according to any one of claims 22 to 25, characterized in that an extractable substance is arranged in the film (200) such that openings are formed in film areas of adjacent hairs (2) when the substance is extracted from the film (200).

27. The method according to any one of claims 22 to 26, characterized in that the film (200) to a top (30) and bottom (20) of the

Hygiene product is processed further.

28. The method according to any one of claims 22 to 27, characterized in that a hygiene product is produced that has a liquid-permeable top (30) and a liquid-permeable bottom (20), an adsorbent layer being arranged between them and for the top (30 ) a multilayer perforated film (200) is used, the top layer of which is wholly or partly covered with a fiber pile, the top (30) being provided for permanent skin contact.

29. The method according to any one of claims 22 to 28, characterized in that the film (200) is arranged with its rake arrangement so that the hairs (2) point into an interior of the hygiene product.

30. Hygiene product manufactured according to one of claims 22 to 29.

31. Hygiene product manufacturing device with one

Hair film production device (205) for producing a film (200), which has at least one side of a fibrous web from a hair arrangement, with a calender (220) and a feed device (215) for the film (200), wherein

a roller (230) of the calender (220) has cavities (250), - A pressure in a calender nip (270) and a rotational speed of a calender roll can be set such that a thermoplastic material guided through the calender nip (270) is pressed into the cavities (250) and - The film (200) from the feed device (215) in the calender gap

(270) for pressing into the cavities (250), characterized in that the cavities (250) have a diameter of up to 0.15 millimeters and the roller (230) only up to a maximum just below the melting temperature of the film (200) is heated up.

32. Device (205) according to claim 31, characterized in that a pulling device allows a change in the pulling angle.

33. Device (205) according to one of claims 31 or 32, characterized in that a further processing station (310) is connected downstream of the device, in particular a printing station.

34. Device (205) according to one of claims 31, 32 or 33, characterized in that a perforation station is connected in series or upstream.