Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4374—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece using different kinds of webs, e.g. by layering webs
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
  • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
  • D04H1/492—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres by fluid jet
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
  • D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
  • D04H1/498—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres entanglement of layered webs
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
  • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
  • D04H1/732—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by fluid current, e.g. air-lay
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H18/00—Needling machines
  • D04H18/04—Needling machines with water jets
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/005—Synthetic yarns or filaments
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/015—Natural yarns or filaments
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
  • D04H3/105—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by needling
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically
  • D04H3/11—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically by fluid jet
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
  • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
  • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

• the invention relates to a method for producing a composite nonwoven fabric web with at least two layers, a first layer being formed by long fibers and a second layer being formed by short fibers.
• the invention also relates to a device for carrying out such a method.
• Such composite nonwoven webs are used, for example, for the production of wet wipes.
• Such wet wipes are used nowadays in different areas, for example as care wipes for babies, hygiene articles for adults, disinfecting wipes, but also cleaning wipes for surfaces, vehicles or other products.
• Care wipes and hygiene articles should be particularly soft and of high quality, which means that medium to higher manufacturing costs are acceptable.
• wet wipes for cleaning are sometimes subject to significantly different requirements, in particular primarily low production costs.
• each layer of fibers is successively formed into a web of material or brought onto such a web and connected to it.
• the second layer to be applied to the first layer is usually produced separately with the help of a former and in particular as a pre-drained material web with a dry content of usually more than 30% on the material web, which is also designed as a material web and / or made of long fibers,
• the existing first layer is laid, usually in a dry process or air process.
• Another known headbox is the inclined screen headbox.
• the long fiber is to be understood as meaning, in particular, a fiber that is relatively long compared to the short fiber, in particular a synthetic and / or synthetic fiber.
• Such long fibers can, for example, have a length between 10 and 150 mm, particularly preferably between 30 and 40 mm.
• continuous filaments can also be provided as long fibers, as in the case of threads of the spunbond type.
• the short fiber is to be understood as meaning, in particular, a fiber that is relatively short compared to the long fiber.
• Such short fibers can, for example, have a length between 0.2 and 9 mm.
• the second layer can be formed from an aqueous dispersion comprising dispersed natural fibers, recycled fibers such as waste paper, man-made fibers and mixtures of such fibers. If short fibers are mentioned in the following, this can also be understood to mean an aqueous dispersion comprising the short fibers.
• the object of the present invention is therefore to improve the production of a composite nonwoven web for clearing at least one of the disadvantages mentioned above, in particular to reduce the production costs of such a web.
• the invention solves the problem set by a method with the features of the main claim and by a device with the features of claim 21.
• Advantageous embodiments and developments of the invention are disclosed in the subclaims, the description and the figures.
• the method according to the invention for producing composite nonwoven webs provides that the short fibers are applied to the first layer in a production line in a wet laying process through a headbox with a round or cross flow distributor in combination with a rotating and / or static turbulence generator.
• a headbox can be, for example, a so-called perforated roll headbox.
• the perforated roller in particular can form a rotating turbulence generator.
• the headbox can have a static turbulence generator, in particular a diffuser block.
• the generation of the second layer, in particular the application of a second layer to the first layer is particularly simple and efficient can take place so that the production of the composite nonwoven web can take place particularly inexpensively.
• the headbox with rotating turbulence generator can in particular be designed as an open headbox.
• the short fibers to be applied in particular an aqueous dispersion comprising the short fibers, can be applied to the first layer via an outlet gap, the first layer being preferably continuously transported in a conveying direction below the headbox, in particular the perforated roll headbox.
• a closed headbox in particular with a static turbulence generator, can be provided, so that higher speeds can be used. It has surprisingly been shown that for use in the method according to the invention at production speeds of up to 100 m / min, a rotating turbulence generator, at production speeds A static turbulence generator is particularly suitable for speeds of over 100 m / min. Furthermore, the headbox can be flown against on one side.
• the surface-related mass of the first layer can be between 10 and 80 g / m 2 .
• the first layer When passing the headbox, the first layer is particularly preferably transported on a sieve belt, further preferably on its surface, so that excess water of the dispersion of the second layer can be removed immediately below and / or in the direction of production after the headbox. This can be done, for example, by suction.
• wet consolidation can take place, for example likewise on a sieve belt or on a cylinder or drum.
• the first layer makes up between 20 and 80 percent by weight of the composite.
• the second layer can also make up between 20 and 80 percent by weight of the composite.
• At least one first layer with a basis weight between 10 g / m 2 and 80 g / m 2 and at least one second layer with a basis weight between 5-100 g / m 2 in a very wide production speed range from 50 m / min up to 500 m / min can be brought together to form the composite nonwoven web if the lower edge of the outlet gap of the headbox of the wet laying process is between a height level of the screen belt and a height level up to 150 mm above the screen belt and / or below a discharge angle of - 20 ° to + 20 ° to the direction perpendicular to the surface of the sieve belt.
• the height level and / or the delivery angle for example, the local area in which the second layer is applied to the first layer, as well as the impulse entered here in the first layer or the energy entered here can be adapted to the respective process conditions and match the first and second layers so that the composite nonwoven fiber web produced by the method according to the invention has particularly uniform properties.
• the height level and delivery angle of the wet laying process can be set in such a way that a structural change in the first layer due to the impact of the second layer is prevented.
• water from the dispersion is additionally sucked off in order to apply an additional force component acting towards the first layer to the second layer.
• This suction is preferably carried out below the sieve belt, for example using flax suction devices, foil strips or similar suction devices, which preferably allow uniform suction of water transversely to the production direction.
• these suction devices can be varied with regard to the height level of their suction and the suction angle, in each case relative to the screen belt.
• these dewatering devices can also be varied in the machine direction with regard to their distance from the head outlet.
• the suction devices can preferably be designed as gravity drainers, in which only gravity acts on the water, or as vacuum drainers that extract the water with a vacuum of up to 800 mbar absolute pressure.
• the first layer can comprise a single layer of long fibers which has been produced in a single process step.
• the first layer can also comprise two or more layers of long fibers which are produced in two or more separate process steps and then connected to one another.
• the first layer can comprise a first layer which is produced with the aid of a first carding process, and a second layer which is applied to and connected to the first layer with the aid of a second carding process.
• the short fibers forming the second layer can be applied to the first layer in a single layer or in two or more layers.
• the short fibers preferably pass a gap in the headbox during the wet laying process.
• This gap can in particular at least partially be formed or limited by a perforated roller. This enables a particularly simple and broad-area distribution of the short fibers.
• the first layer is preferably produced by unwinding a nonwoven web or by a carding process. Thereby a particularly high strength of the composite nonwoven can be achieved.
• the carding of the first layer can in particular take place immediately before the application of the second layer, in particular online in the same production line.
• the first layer can consequently in particular represent a carded fleece.
• the first layer comprises several, for example two, layers, each can comprise a carded fleece. Each of these layers is then also referred to as a card (“C"). If the composite nonwoven web comprises a single second layer, which is also referred to as pulp (“P”), the composite nonwoven web would also be called "CCP".
• Pre-consolidation of the first layer preferably takes place - in particular immediately - prior to the application of the second layer.
• the pre-consolidation can in particular take place on a sieve belt.
• the pre-consolidation takes place in particular by means of a water jet.
• a hydrodynamic needling or turbulence known per se for this application in particular a water nozzle, can be used.
• the short fibers are preferably dispersed to form an aqueous dispersion.
• the dispersion can impart plastic properties to the fibers in the course of several minutes, whereby the efficiency of entanglement by water jets can be optimized when the dispersion is applied to the first layer.
• At least one compacting of the at least two layers takes place after the application of the second layer.
• water can be withdrawn from the second layer at the same time, in particular the excess water can be filtered off through the lower layer.
• a step for intertwining the natural fibers of the second layer by means of a water jet device can take place.
• the fibers can be entangled in particular on a sieve belt.
• a water nozzle known per se for this application can again be used for this purpose.
• the second layer - in particular immediately after compacting - at least one intertwining of the short fibers of the second layer - particularly preferably exclusively - with one another and / or with the long fibers of the first layer by means of hydroentanglement.
• the hydroentanglement can take place when the at least one layer rests on a sieve belt or when at least one layer rests against a drum.
• a first hydroentanglement of the layers can take place when they are in contact with a screen belt and a downstream second waterjet consolidation when they are in contact with a drum.
• a water nozzle known per se for this application can in turn be used for this and all of the hydroentanglement processes mentioned below.
• the first layer preferably forms a lower layer and the second layer an upper layer, or the second layer forms a middle layer and the first layer each forms one upper and one lower layer.
• the second layer that is to say the short fibers, is arranged in particular between the two first layers, that is to say the long fibers.
• the upper layer and the lower layer do not necessarily have to be of the same type, in particular do not have to be the same position in a temporally preceding stage. Rather, the upper first layer and the lower first layer can be constructed differently and in particular manufactured separately.
• the long fibers can be selected from the group of artificial and / or synthetic fibers, in particular from viscose, polyester, polypropylene, polyamide, polyacrylic, polyvinyl alcohol and polyethylene fibers as such or as a mixture.
• Natural fibers can also be used, for example selected from the group of cotton, hemp, flax, jute or bamboo fibers, as such or as a mixture, also with those from the group of artificial and / or synthetic fibers.
• fibers made from biopolymers for example polyactide or polyhydroxybutryrate, as such or as a mixture, also with those from the group of artificial and / or synthetic fibers and / or natural fibers, can be used.
• the concentration of the short fibers in the headbox with rotating or static turbulence generator is particularly preferably between 0.5 and 10 grams / liter.
• the pre-consolidation of the first layer, the wet laying process of the second layer and the compression of the at least two layers are preferably carried out on a common, first screen belt, and then hydroentanglement - in a first embodiment of the invention also exclusively - when the layers are in contact with one Drum.
• a first hydroentanglement takes place on the separately formed second screen belt and the second hydroentanglement takes place on a drum
• an advantage lies in the process-related decoupling of the wet laying process from the hydroentangling process.
• the characteristics of forming and hydroentanglement screens can differ significantly.
• the process can be designed to be more energy-efficient, in particular with less water and fiber losses, and more precisely controllable.
• the separation of the water circuits, in particular the forming area and the hydroentanglement makes it possible to operate the individual circuits individually depending on the requirements.
• an additional first layer is applied to the second layer by means of an additional Carding, or unwinding a roll web, is applied.
• the second carding unit or unwinding device required for this is integrated into the production line.
• the second, first layer can in particular be applied continuously to the layers that have already been produced. In this way it is possible to produce composite nonwoven webs, for example of the CPC, SPC, or SPS structure.
• the C-ply can consist of bicomponent fibers or comprise two-component fibers.
• Bicomponent fibers are to be understood as meaning those fibers in which at least one component has thermoplastic properties.
• the C-ply can also consist of one-component fibers, at least some of which have thermoplastic properties.
• the carding process preferably comprises a process step of air-through-bonding before the second layer is applied to the first layer in a further process step.
• the fibers become the heated air is applied to the first layer in such a way that the fibers at least partially fuse / stick to one another in areas in which they lie against one another.
• the further process step preferably comprises a water jet consolidation for compacting and / or joining the second layer to the first layer.
• the process steps of carding, in particular air through-bonding and compacting and joining, in particular hydroentanglement, can take place inline, i.e. in a common production line.
• the first layer can be produced, rolled up, transported and then unwound in order to apply the second layer, for example by means of through-bonding.
• the production of particularly thick and highly absorbent, two-layer composite nonwoven material web is possible, which are particularly suitable for the production of hygiene articles.
• the device according to the invention for producing a composite nonwoven web is characterized in that in a production line at least one conveyor device for transporting at least the first layer in a conveying direction and a headbox arranged above this conveyor device with a rotating and / or static turbulence generator, in particular a perforated roller headbox or Headbox with diffuser block, for applying the Kurzfa fibers or dispersion of short fibers to the first layer for producing the second layer is arranged.
• a headbox By arranging such a headbox, the manufacturing costs of such a material web can in particular be significantly reduced.
• a system that is relatively space-saving and relatively inexpensive both in production and in assembly and in operation can be provided.
• the conveyor device is designed in particular in such a way that the composite non-woven fabric strip can be transported from the beginning of the production line to an end of the production line.
• the device can comprise several conveying services, such as, for example, conveyor belts, drive rollers, deflection rollers, embossing rollers and / or drums.
• the conveying device in question, above which the headbox is arranged, can for example be designed as a sieve belt.
• One or more carding units preferably with a rotating or static turbo lenz generator for producing the first layer, are preferably arranged upstream and / or downstream of the headbox in the conveying direction.
• the first layer can in particular be designed as a carded fleece.
• the conveying device preferably comprises a first sieve belt, the headbox preferably being arranged above this first sieve belt.
• the first screen belt can in particular be designed as a forming screen.
• the first sieve belt is used in particular for particularly effective dewatering of the suspension through the sieve support. Furthermore, the entire water balance of the system can thereby be improved and consequently the costs associated with operating the system can be reduced.
• the first screen belt preferably extends with a section both below the headbox and below at least one water jet consolidation device.
• the first layer of which comprises only one or more C-layers and the second layer of which comprises one or more P-layers also for production speeds of more than 100 m / min and for surface weights of the first layer of 25 g / m 2 or larger is particularly suitable
• a first screen belt is provided in the conveying direction after the headbox, on wel chem pre-consolidation, moistening and fixing of the first layer takes place.
• a second main web is provided behind in the production direction, on which a feed Bringing the first and the second layer together and an initial hydrodynamic hardening of both layers takes place before the two layers are transferred to further process steps.
• a second water jet device for compacting at least the first and second layer, a first water jet consolidation device for entangling the short fibers of the second layer with one another and / or a second water jet consolidation device for entangling the short fibers of the second layer arranged with the long fibers of the first layer.
• the second water jet device for compacting the layers is preferably arranged above a first conveyor device for transporting the web, such as the first sieve belt, and the first hydroentangling device above a separate second conveyor device for transporting the web, such as a second sieve belt.
• the headbox preferably comprises a turbulence generator in the form of perforated rollers or diffusers. In an alternative embodiment, such a turbulence generator is not provided.
• Figure 1 - a first embodiment of the device according to the invention
• FIG. 2 shows a flow chart of a first embodiment of the method according to the invention with the device according to FIG.
• Figure 3 - a second embodiment of the device according to the invention.
• FIG. 5 shows a flow chart of a second embodiment of the method according to the invention with the device according to FIG. 3 or FIG. 4;
• FIG. 6 - a fourth embodiment of the device according to the invention.
• FIG. 7 shows a flow chart of a third method according to the invention with the device according to FIG. 6;
• FIG. 8 - a supply system for one of the aforementioned devices; and FIG. 9 is a flow diagram of the system according to FIG.
• the devices 30a, 30b, 30c and 30d shown in FIGS. 1, 3, 4 and 6 as well as the methods 100a, 100b, 100c shown in FIGS. 2, 5 and 7 serve in particular to produce a composite nonwoven web 7 with at least two layers 1, 2, 3, a first layer 1, 3 being formed by long fibers 4, 6 and a second layer 2 by short fibers 5.
• FIG. 1 shows a first exemplary embodiment of the device 30a according to the invention, with which a first exemplary embodiment of the method 100a according to the invention shown in FIG. 2 can be operated.
• the device 30a comprises a production line 9 which, viewed in a conveying direction 8, has a first area 31 for forming the first layer 1, a second area 32 for forming the second layer 2, a third area 34 for consolidating the two layers 1, 2 and has a fourth area 35 for finishing the web 7.
• the material web 7 is transported from the first area 31 to the fourth area 35 by means of a conveyor device 27, which is not shown in full.
• a carding unit 10 for producing, in particular carding 101, the first layer 1 is provided in the first region 31.
• the second area 32 comprises a pre-consolidation unit 11, a headbox 12 with a rotating or static turbulence generator, in particular a perforated roller headbox, and a compression unit 13 a water intake 20 is arranged.
• the pre-consolidation unit 11 comprises a first water jet device for pre-consolidation 102 of the first layer 1.
• the headbox 12 comprises a transverse or circular flow distributor 23 and a unit providing the short fibers 5 or an aqueous dispersion 5a comprising the short fibers 5, such as a storage tank.
• the headbox 12 is used to apply 103 the second layer 2 to the first layer 1, also referred to as wet laying.
• the compression unit 13 comprises a second water jet device for compressing 104 at least the applied second layer 2.
• the headbox 12 and / or the compression unit 13 is the water receiver 20 for at least partially dewatering the second layer applied to the first layer 1 2 arranged, in particular to filter from the excess water through the lower layer.
• a consolidation unit 16 in particular a centrifugal consolidation device for hydroentangling 107 of the two layers 1, 2, is arranged.
• the water jet hardening 107 takes place in particular on both flat sides of the material web 7.
• the material web 7 runs around a first drum 24 and a second drum 25.
• a finishing unit 17 is arranged in the third area 34, in particular a further water jet hardening device for one-sided forming or embossing 108 of the web of material 7.
• a third drum 26 is provided for this purpose.
• FIG. 3 shows a second exemplary embodiment of the inventive device 30b and FIG. 4 shows a third exemplary embodiment of the inventive device 30c, whereby a second exemplary embodiment of the inventive method 100b shown in FIG. 5 can be operated with both devices 30b, 30c.
• the device 30b, 30c each comprises a production line 9 which, viewed in a conveying direction 8, has a first area 31 for forming the first layer 1, a second area 32 for forming the second layer 2, and a third area 34 for solidifying the two layers 1, 2 and a fourth area 35 for finishing the web 7.
• the material web 7 is transported from the first area 31 to the fourth area 35 by means of a conveying device 27, which is not shown in full.
• the devices 30b, 30c differ in particular in the arrangement and configuration of the conveying device in the second and third areas 32, 34.
• the first layer 1 is again provided.
• the second area 32 comprises a preconsolidation unit 11, again a headbox 12 with rotating or static turbulence generator and a compression unit 13.
• the preconsolidation unit 11 in this case comprises a first water jet device for preconsolidating 102 the first layer 1.
• the headbox 12 in this case comprises a cross or circular flow distributor 23 and also a unit providing the short fibers 5 or an aqueous dispersion 5a comprising the short fibers 5, such as a storage tank.
• the headbox 12 is used to apply 103 the second layer 2 to the first layer 1.
• the compression unit 13 comprises a second water jet device for compressing 104 at least the applied second layer 2.
• first consolidation unit 15 in particular a first hydroentanglement device for hydroentanglement 106, in particular the second layer 2, and a second consolidation unit 16, in particular a hydroentanglement device for hydroentanglement 107 of the two layers 1, 2 arranged.
• the hydroentanglement one hundred and seven he follows in particular exclusively on the upper flat sides of the web 7, that is, exclusively on the second layer 2.
• the web 7 rests on a conveyor 27 on a conveyor.
• the hydroentanglement 107 takes place on the flat sides of the web 7.
• the web 7 runs around a first drum 24 and a second drum 25.
• a forming unit 17 is arranged in the third area 34, in particular a further hydroentangling device for one-sided forming or Embossing 108 of the web 7.
• a third drum 26 is provided.
• a first screen belt 21 and in the third area 34 a separately formed second screen belt 22 is arranged as part of the conveyor 27 for transporting the web 7 in the second area 32.
• the first sieve belt 21 transports the web 7 to behind the compression unit 13.
• the steps of pre-consolidation 102, wet laying 103 and compression 104 take place.
• the second sieve belt 22, which takes over the web 7 after compression 104 transports the material web 7 exclusively in the area of the first consolidation device 15.
• a separately formed second screen belt 22 is in particular not provided in this device 30c.
• Common to both devices 30b and 30c is the fourth area 35, in which drying 109 of the web 7 by means of a dryer drum 18 and rolling 110 of the web 7 onto a winding roll 19 takes place.
• FIG. 6 shows a fourth exemplary embodiment of the device 30d according to the invention, with which a third exemplary embodiment of the method 100c according to the invention, shown in FIG. 7, can be operated.
• the device 30d comprises a production line 9 which, viewed in a conveying direction 8, has a first area 31 for forming the first layer 1, a second area 32 for forming the second layer 2, a third area 33 for forming an additional second first layer 3, a fourth area 34 for consolidating the three layers 1, 2, 3 and a fifth area 35 for finishing the web 7.
• the material web 7 is transported from the first area 31 to the fifth area 35 by means of a conveyor device 27, which is not shown in full.
• the device 30d differs from the device 30a shown in FIG. 1 in particular in the arrangement of a further carding unit 14 for carding 105 a further layer 3.
• a first carding unit 10 for producing, in particular special carding 101, the first layer 1 is provided.
• the second area 32 comprises a preconsolidation unit 11, again a headbox 12 with rotating or static turbulence generator and a compression unit 13.
• the preconsolidation unit 11 again comprises a first water jet device for preconsolidating 102 the first layer 1.
• the headbox 12 comprises a cross or circular flow distributor 23 as well a unit providing the short fibers 5 or an aqueous dispersion 5a comprising the short fibers 5, such as a storage tank.
• the headbox 12 is used to apply 103 the second layer 2 to the carded first layer 1.
• the compression unit 13 comprises a second water jet device for compressing 104 at least the applied second layer 2. Below the pre-consolidation unit 11, the headbox 12 and / or the Compression unit 13 is again that Sieve belt 21 as well as the water absorption 20 for at least partially dewatering the second layer 2 applied to the first layer 1 is arranged.
• the second carding unit 14 for carding 105 a further first layer 3 is arranged in the third area 33.
• This additional first layer 3 also comprises long fibers 6, which, however, do not necessarily have to correspond to the long fibers 4 of the first layer 1 produced by means of the first carding unit 10.
• This additional first layer 3 results in a three-layer composite nonwoven in which the outer flat sides are each formed by a first layer 1, 3 and the second layer 2 is arranged between the two first layers.
• a consolidation unit 16 in particular a hydroentanglement device for hydroentanglement 107 of the three layers 1, 2, 3 is arranged in the fourth area 34.
• the hydroentanglement 107 takes place in particular on the two outer flat sides of the web 7.
• the web 7 runs around a first drum 24 and a second drum 25.
• a forming unit 17 is arranged in the third area 34, in particular a further hydroentangling device for one-sided forming or embossing 108 of the web of material 7.
• a third drum 26 is provided for this purpose.
• the material web 7 is dried 109 by means of a dryer drum 18 and the material web 7 is rolled up 110 onto a winding roll 19.
• FIG. 8 shows an example of a supply system 121, in particular a water management system, with which the exemplary embodiment of a method 100d shown in FIG. 9 can be operated.
• the supply system 121 is concerned, on the one hand, with the provision of an aqueous dispersion 5a comprising the short fibers 5 for the headbox 12 and, on the other hand, with the provision, use and recycling of water provided in the aforementioned context.
• aqueous dispersion 5a short fibers 5 of a dispersing unit 114 are first used by means of a bundle conveyor 113 to be carried out therein Dispersing 111 promoted.
• the resulting cleaned mass is fed by a pump 115 to a mixer and / or container 116 for storage 112.
• the provision to the headbox 12 is carried out by pumping 117 the dispersion 5a from the container 116.
• water can be withdrawn from the second layer 2 by the screen belt 21 and the water intake located underneath it 20 take place.
• active pumping or suction 118 can take place on the underside of the sieve belt 21.
• the water obtained with the water intake 20 is fed to a water tank 119. From this water tank 119, water can be pumped 120 to the headbox 12, the container 116, a conveying line for pumping 117 the dispersion 5a from the container 116 and / or a conveying line for pumping 115 the pulpy mass from the dispersion unit 114.
• the last two possibilities mentioned serve in particular to avoid clogging of the pumps 115, 117.
• This water circuit enables a particularly efficient and cost-effective operation of the system.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Nonwoven Fabrics (AREA)
• Manufacturing Of Multi-Layer Textile Fabrics (AREA)

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Publications (1)

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Family Applications (1)

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• 2020
  • 2020-01-10 DE DE102020100472.9A patent/DE102020100472A1/de active Pending
  • 2020-12-08 US US17/791,214 patent/US20230340709A1/en active Pending
  • 2020-12-08 CN CN202080092380.XA patent/CN114929959B/zh active Active
  • 2020-12-08 BR BR112022013381A patent/BR112022013381A2/pt unknown
  • 2020-12-08 WO PCT/EP2020/085108 patent/WO2021139945A1/de unknown
  • 2020-12-08 EP EP20824161.2A patent/EP4087967A1/de active Pending

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