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
  • D04H1/425—Cellulose series
• • 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
  • D04H1/48—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 in combination with at least one other method of consolidation
  • D04H1/49—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 in combination with at least one other method of consolidation entanglement by fluid jet in combination with another consolidation means
• • 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
  • D04H3/08—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
  • 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
  • D21F11/14—Making cellulose wadding, filter or blotting paper
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F3/00—Press section of machines for making continuous webs of paper
  • D21F3/02—Wet presses
  • D21F3/0209—Wet presses with extended press nip
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F3/00—Press section of machines for making continuous webs of paper
  • D21F3/02—Wet presses
  • D21F3/0272—Wet presses in combination with suction or blowing devices
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F3/00—Press section of machines for making continuous webs of paper
  • D21F3/02—Wet presses
  • D21F3/0281—Wet presses in combination with a dryer roll
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F9/00—Complete machines for making continuous webs of paper

Definitions

• the present invention relates to a method for converting a device comprising suction tubes and / or suction boxes for producing a nonwoven fabric in order to increase the production capacity and energy efficiency of the device and to operate the device.
• a nonwoven web is a web of limited length fibers, continuous filaments or cut yarns of any kind and of any origin, which are in some way joined together to form a nonwoven (ie, a fibrous web) and somehow bonded together have been.
• Nonwoven fabrics include fiber webs made by interlacing yarns such as those used in weaving, knitting, knitting, lace making, braiding, and tufted fabric making. Also films and papers are not among the nonwovens.
• Known processes for the production of nonwovens generally include nonwoven formation, nonwoven bonding and subsequent dewatering. Different methods of web formation are, for example, in WO
• the nonwoven can be formed in particular by a dry process, a wet process and / or an extrusion process.
• any combinations of such web-forming methods are also conceivable.
• the subsequent nonwoven consolidation can be effected, for example, mechanically or by the so-called hydroentanglement process, which is also called "spunlacing".
• hydroentanglement process the formed web is solidified by entangling the fibers, the entangling being effected by swirling, in particular by the fact that focused high-pressure water jets act on the web.
• suction tubes or suction boxes subjected to vacuum have hitherto been used following the hydroentanglement. With such suction tubes or suction boxes wanted to increase the dry content of the nonwoven web as much as possible, without sacrificing volume.
• Suction boxes can make the subsequent dryer section in terms of production capacity to a bottleneck.
• Conventional suction tubes or suction boxes comprehensive devices for the production of nonwovens have a production capacity of only 700 to 900 kg / m / hr. on. To be competitive, these systems must be rebuilt.
• TAD Through Drying
• suction tubes or suction boxes Another disadvantage of suction tubes or suction boxes is that destroyed by this the desired uniform moisture profile of the nonwoven web or at least impaired, which in particular air losses at the web edges due to a non-constant width of the web and on the technology of some suction tubes or boxes is due.
• a non-uniform moisture cross-section can bring about limitations of the production process, in particular with regard to thermal solidification.
• the air loss at the material web edges also brings a high energy consumption with it.
• nonwoven fabric composition and structure of the nonwoven material web which may also be structured or perforated, for example, the dry content of the nonwoven material web obtained after dewatering is limited.
• DE 10 2006 042 507 A1 discloses the use of a shoe press for dewatering a nonwoven material web.
• a shoe press viewed in the web running direction, has an extended press nip or press nip, as compared to a nip. Due to the relatively high pressure of the shoe press, however, it comes before the press nip the shoe press to a disturbing water retention. In addition, the relatively high pressure of the shoe press leads to a reduction in the volume of the nonwoven fabric.
• the suction pipes and / or suction boxes arranged all upstream of the drying device are removed and replaced by a belt press arranged between the former and the drying device and configured as described above, the disadvantages associated with suction tubes and suction boxes, in particular limited drainage capacity, limited production capacity, large space requirement, production of nonwovens with non-uniform moisture cross profile, fiber loss in the production by "fiber plucking" and the like, overcome and it is obtained a device with which a nonwoven fabric efficiently and inexpensively with gentle, uniform and efficient dewatering of the formed nonwoven material web and under Forming a nonwoven web with a very large volume and having a uniform moisture cross profile is obtainable.
• the roller of the belt press is designed for dispensing or receiving drying fluid with an open surface and the belts of the belt press as compared to drying fluid and preferably air and / or water vapor permeable belts are formed to allow a drying fluid to flow through the permeable belts and the nonwoven web simultaneously with the pressing of the nonwoven web against the roll by a pressure differential between the roller and the outer press belt can.
• At least one (endless) band wrapped around the drum of the belt press is permeable to water or adapted to receive water to absorb and / or accumulate the water produced by the mechanical press in the belt press to let pass.
• the roller of the belt press is designed as a blow roll so that the drying fluid can be blown from the blow roll at least through the permeable inner band, the nonwoven material web and the permeable outer press belt preferably to a hood.
• the water dewatered in the belt press is expediently also blown or guided into the hood or the permeable outer band.
• a means for solidifying the formed web to a nonwoven web is disposed between the former and the belt press to solidify the web formed in the former prior to further dewatering in the belt press.
• the solidification device may be a mechanical hardening device and particularly preferably a hydroentangling device.
• the dewatering performance of the belt press depends in particular on the roll diameter, the rolling rotational speed and the wrap angle, ie the angle at which the nonwoven material web wraps around the roll.
• good results are obtained when the diameter of the roller of the belt press is in a range of 500 mm to 1400 mm, and preferably in a range of 750 mm to 1200 mm.
• the nonwoven material web is transferred in a closed train from the former to the belt press and preferably as far as the drying device. This can be achieved particularly simply by transferring the nonwoven material web from the former to the belt press and preferably to the drying device via a single transfer belt, such as a forming screen.
• an additional dewatering press may, for example, be provided between the belt press and the thermal drying device.
• a line force in a range of 20 kN / m to 100 kN / m, and preferably a line force in a range of 50 kN / m to 90 kN / m can be generated.
• the further dewatering of the nonwoven web comprises the dewatering in the belt press, wherein the nonwoven web is disposed at least in the region of the roller between the inner band and the outer press belt and the press belt with one
• the inventive method also makes it possible to transfer the nonwoven material web with a higher solids content of the final, especially thermal drying device, whereby the machine speed is increased in the dryer section. Due to the reduced pressure in the belt press, the volume of the nonwoven web is reduced by no more than 10% in the dewatering.
• the solids content of the nonwoven web can be increased relative to the water content by more than 10% compared to the usual dewatering by suction boxes, resulting in a higher production capacity, energy consumption is reduced and the provision of additional or more expensive drying facilities is avoided.
• the roller of the belt press is designed for dispensing or receiving drying fluid with an open surface and are used as belts of the belt press against drying fluid and preferably against air and / or water vapor permeable belts pressing the nonwoven web against the roll, a drying fluid is forced through the permeable webs and nonwoven web, and way by generating a corresponding pressure difference between the roller and the outer press belt.
• any inert gas or aerosol can be used as the drying fluid, with good results, in particular with air and / or steam.
• air may, for example, have ambient temperature.
• hot air may be used as the drying fluid, preferably hot air at a temperature in a range of 50 ° C to 250 ° C, more preferably at a temperature in a range of 150 ° C to 250 ° C, and more particularly preferably at a temperature in a range of 175 ° C to 225 ° C, such as at a temperature of about 200 ° C.
• a drying fluid is preferably pressed through the nonwoven web in the belt press simultaneously with the mechanical pressurization, wherein the roller of the belt press for dispensing or receiving the Drying fluid is designed with an open surface. It can be used as a roller, in particular a suction roll or a blow roll.
• the drying fluid is preferably blown out of the blow roll at least through the permeable inner (endless) belt, the nonwoven material web and the permeable outer (endless) belt preferably in a hood ,
• the drying fluid at a pressure in the range of 0.25 bar to 0.6 bar, and more preferably at a pressure in the range of 0.30 bar to 0.55 bar, such as for example, with a pressure in the range of about 0.45 bar, above atmospheric pressure through the permeable inner band, through the nonwoven web and through the permeable outer press belt is blown to the hood.
• roller of the belt press is still surrounded by one or more other (endless) belts in addition to the inner and the outer (endless) belt, then these other (endless) belts must also be permeable to the drying fluid, provided that the nonwoven fabric Material web in the belt press to be acted upon by such a drying fluid, which - as stated above - is particularly preferred.
• a mechanical pressure of less than 140 kPa, in particular less than 100 kPa and preferably less than 90 kPa , but of more than 30 kPa and preferably more than 45 kPa is exercised.
• Nonwoven fabric and therefore no significant volume loss occurs. Also in view of a sufficiently good, but at the same time as gentle and uniform drainage, it is proposed in development of the invention, the residence time of the nonwoven material web in the extended press nip of the belt press on between 0.05 sec and 0.5 sec set. With such a relatively long residence time, an efficient drainage is ensured despite the relatively low pressure and the correspondingly gentle treatment of the nonwoven material web.
• the nonwoven material web is dewatered in the belt press by at least 20%, preferably by 30 to 75% and particularly preferably by 33 to 50%.
• this degree of dewatering denotes the percentage weight loss in the dewatering based on the total weight of the nonwoven material web prior to dewatering in the belt press.
• the belt press with only two roll wrapping the (endless) provided bands and the nonwoven material web between these two (endless) bands and the bands is arranged touching. In this case, both the inner (endless) belt and the outer press belt contact the nonwoven web.
• the belt press except the inner and the outer (endless) band may also be provided with at least one further (endless) band wrapping the roller in a predetermined wrap angle.
• the at least one further (endless) band can be arranged in particular between the outer press belt and the nonwoven material web.
• the (endless) bands wrapping the roller of the belt press comprise at least one felt belt and / or a fabric belt. It is particularly advantageous if a felt belt is used as the inner band of the belt press (endless). This also applies in particular if the nonwoven material web in the belt press is simultaneously passed through by a drying fluid and a suction roll is used as the roller of the belt press. If a blow roll is used as the roll, it is possible in particular for at least one outer (endless) band, which is viewed behind the nonwoven material web, to be provided as a felt band in the direction of flow of the drying fluid. Dewatering on a felt belt results in a substantially more uniform moisture cross profile than is the case, for example, in the case of dewatering by means of a suction box. In addition, with the drainage of a felt and the fiber losses are reduced.
• At least one (endless) band wrapped around the drum of the belt press is permeable to water or adapted to receive water to absorb and / or accumulate the water produced by the mechanical press in the belt press to let pass.
• an outer (endless) band of the belt press for example, an at least substantially smooth belt and preferably a smooth forming belt can be used.
• a structured and / or perforated nonwoven fabric is to be produced by the method according to the invention, it is provided according to a preferred embodiment of the present invention that at least one of the nonwoven fabric Web-contacting (endless) band of the belt press is provided as a structured band by which the nonwoven web is structured and / or perforated accordingly.
• the nonwoven material web in the belt press is preferably also subjected to a drying fluid simultaneously with the pressurization and more than two permeable (endless) belts are wound around the roller of the belt press, these (endless) belts can be viewed in particular in the direction of flow of the drying fluid
• a permeable (endless) belt, an endless smooth forming fabric, an endless permeable fabric belt, and an endless permeable felt belt can be viewed in particular in the direction of flow of the drying fluid
• a permeable (endless) belt, an endless smooth forming fabric, an endless permeable fabric belt, and an endless permeable felt belt can be viewed in particular in the direction of flow of the drying fluid
• a permeable (endless) belt, an endless smooth forming fabric, an endless permeable fabric belt, and an endless permeable felt belt In principle, however, it is also possible to provide fewer or more (endless) bands and / or a different sequence of these (endless) bands.
• a permeable press belt stretched around the roll a permeable wire belt, a permeable fabric belt and a permeable felt belt, or
• a permeable press belt stretched around the roll a permeable wire belt, a permeable fabric belt and a permeable felt belt, or
• a permeable press belt stretched around the roll a permeable felt belt, a permeable fabric belt and a permeable felt belt, or
• the (endless) bands of the belt press are suitably looped around the roller over the same angle of wrap.
• the wrap angle of the inner band and / or outer press belt around the roller in a range of 90 ° to 180 ° and in particular in a Range of 100 ° to 120 ° is selected.
• a residence time of the nonwoven material web required for a sufficiently high and at the same time gentle, uniform dewatering is achieved in the press nip of the belt press.
• the residence time of the nonwoven material web in the press nip at the same roll diameter and the same roll revolution speed is the greater the greater the wrap angle of the belts.
• the diameter of the roller of the belt press is selected in a range of 500 mm to 1400 mm and preferably in a range of 750 mm to 1200 mm. Since the pressure exerted on the nonwoven web in the belt press depends inter alia on the angle of wrap of the (endless) belts and on the diameter of the roller of the belt press such a relatively large diameter a relatively long press nip and a correspondingly efficient dewatering due to the longer residence time of the nonwoven material web in the press nip. In principle, the greater the diameter of the roll, the greater the residence time of the nonwoven material web in the press nip at the same wrap angle of the belts and the same roll revolution speed.
• the nonwoven material web can be guided through an additional dewatering press between the belt press and such a thermal drying device.
• a line force in a range of 20 kN / m to 100 kN / m, and more preferably a line force in a range of 50 kN / m to 90 kN / m is preferably produced to provide a gentle and uniform, but nevertheless to achieve strong drainage.
• the nonwoven material web is guided in the inventive method in a closed train of the former at least up to the belt presses and preferably up to one of these downstream thermal drying device.
• the transfer belt is formed by the forming fabric on which in the former the fleece is formed.
• the nonwoven fabric can be formed in the former by any method known to those skilled in the art, preferably by a dry method, wet method and / or an extrusion method.
• the nonwoven may be formed in the former at least partially by a wet process, in which the fibers are in particular suspended in water and deposited on a water-permeable support.
• the nonwoven in the former can also be formed at least partially mechanically.
• it may be formed, at least in part, from carded or carded piles, which are laid one on top of the other, or formed by carding machines.
• the nonwoven may be at least partially formed by the so-called spunbond method in which the nonwoven by forming fibers spun from a polymer melt passing through nozzles and drawn by means of cold air and / or mechanically drawn.
• the nonwoven in the former can finally be formed at least partially by the so-called melt-blow process.
• the nonwoven fabric is formed by depositing fibers which are directly spun from a polymer melt passing through nozzles and drawn to rupture by means of hot air streams.
• the nonwoven fabric may be formed in the former not only by one of the aforementioned methods but also, in particular, by any combination of two or more of said methods.
• the formed web may be consolidated by a consolidation process which preferably comprises mechanical consolidation and / or hydroentanglement.
• hydroentanglement the formed web is consolidated by entanglement of fibers to the nonwoven web which is accomplished by tumbling, in particular by the use of focused high pressure water jets on the web.
• the fleece can be simultaneously structured and / or perforated by the application of water jet.
• a hydroentanglement is not mandatory and can be omitted in particular when the nonwoven fibrous web is transferred in a closed train, such as by a single transfer belt, at least up to the belt press.
• the material input into the former can i) at least partially from natural fibers, preferably from northern bleached kraft pulp (NBKP), hardwood pulp (LBKP), pulp from abaca fibers or cotton, ii) at least partially artificial fibers, preferably of viscose, iii) at least partially of synthetic fibers, preferably of polyester or polyamide, iv) at least partially of mineral fibers, preferably glass fibers, v) at least partly of carbon fibers and / or vi) of a mixture of any of the foregoing consist of these substances.
• natural fibers preferably from northern bleached kraft pulp (NBKP), hardwood pulp (LBKP), pulp from abaca fibers or cotton
• artificial fibers preferably of viscose
• iii) at least partially of synthetic fibers preferably of polyester or polyamide
• iv) at least partially of mineral fibers preferably glass fibers
• Nonwoven material web before or after the belt press additionally guided over a vacuum applied suction roll.
• Fig. 2 is a schematic representation of a first exemplary
• Fig. 1 shows a schematic representation of a conventional apparatus 10 for producing nonwovens with a former 12, a Wasserstrahlverfesti- supply device 14, a plurality of suction tubes or suction boxes 16 comprehensive drainage device 18 and two thermal drying devices 20, namely two TAD or air drying units, a Dipping bath 22 for charging the dried nonwoven material web with a finishing agent and a winding device 24.
• the nonwoven fabric is formed by the wet process with a low consistency.
• a device for producing a nonwoven fabric configured as described above according to the prior art is converted according to the invention by the following steps:
• the belt press comprises a roller to the at least one applied to the roller inner band and an outer Press belt are wound, wherein a nonwoven web formed from the web formed in the former, at least in the region of the roller between the inner band and the outer press belt arranged and arranged nen arranged, and, wherein the press belt with a belt tension of at least 15 kN / m pressed to the roller and preferably pressed.
• the web is formed in a former 28 of a subject apparatus 30 for producing nonwoven webs by a particular method or combination of such methods.
• the nonwoven formed is, for example, consolidated mechanically, by means of a hydroentanglement device 32 and / or the like, and then the dewatered nonwoven material web is further dewatered.
• solidification is not always mandatory.
• Further dewatering of the nonwoven web formed from the formed web comprises dewatering by means of a belt press 34 having a roller 36 around which at least one inner endless belt 40 contacting the roller to form an elongated press nip 38 over a respective wrap angle and an outer belt press belt Endless belt 42 is looped.
• the nonwoven may be formed in particular by a dry process, a wet process and / or an extrusion process.
• the outer endless belt 42 of the belt press 34 which serves as a press belt, is tensioned around the roller 36 or pressed against this roller 36 with a belt tension of at least 15 kN / m for generating a mechanical pressure on the nonwoven material web lying between the two endless belts 40, 42 , By this press belt 42, the nonwoven fabric web and the roller 36 touching inner endless belt 40 are pressed against the roller 36.
• a drying fluid is forced through the endless belts 40, 42 and the nonwoven web by creating a pressure differential between the roller 36 and the outer press belt 42
• the endless belts 40, 42 in the present case are permeable to the drying fluid, ie permeable to the drying fluid.
• the roller 36 of the belt press 34 is designed to discharge or receive the drying fluid having an open surface. It may in particular be formed by a suction or blowing roll.
• At least one (endless) belt 40, 42 wound around the roller of the belt press is permeable to water or is designed such that it can absorb water in order to absorb the mechanical pressure occurring in the belt press 34 to absorb accumulating water and / or to let pass.
• air or water vapor can be used as the drying fluid, it being possible to use air at ambient temperature or also hot air as the drying air.
• the drying fluid is discharged from a drying fluid hood 44 at least through the permeable outer endless belt 42, which Nonwoven material web and the permeable inner endless belt 40 are sucked or guided into the suction roll.
• the drying fluid from the blow roll is blown into the hood 44 at least through the permeable inner endless belt 40, the nonwoven web, and the permeable outer endless belt 42.
• the belt press 34 can be provided, for example, with only two endless belts 40, 42 wrapping the roller 36.
• the nonwoven material web lying between these endless belts 40, 42 is in this case touched by the two endless belts 40, 42.
• the endless belts 40, 42 wrapping the roller 36 of the belt press 34, in particular in the direction of flow of the drying fluid comprise a permeable endless belt, an endless smooth forming fabric, an endless fabric belt and an endless felt belt.
• fewer or more endless belts and / or the endless belts may be provided in a different order than the one just mentioned.
• the belts wrapping the roller 36 preferably comprise, viewed in the direction of flow of the drying fluid
• a permeable press belt stretched around the roll 36 a permeable wire belt, a permeable fabric belt and a permeable felt belt, or c) a permeable press belt stretched around the roll 36, a permeable felt belt, a permeable fabric belt and a permeable felt belt, or d) a permeable felt press belt stretched around the roller 36, a permeable fabric belt and a permeable felt belt.
• the belts wrapping the roller 36 preferably comprise viewed in the direction of flow of the drying fluid
• the nonwoven material web Downstream of the belt press 34, the nonwoven material web is passed through at least one thermal drying device 46, in particular a TAD or air drying unit or a flat bed furnace.
• the nonwoven material web can be dried in such a thermal drying device 46, in particular to the final dry content.
• the nonwoven fabric may advantageously be formed with a low consistency having a solids content of in particular 0.01 to 0.1% on a smooth forming fabric or a structured forming fabric which structurally and / or perforates the nonwoven fabric.
• a so-called Schrägsiebformer or the like can be used.
• the fleece can also be structured and / or perforated at the same time by the optionally provided hydroentanglement device 32.
• Such a hydroentanglement device 32 is accordingly preferred, in particular in those cases in which the nonwoven or the nonwoven material web is additionally to be structured and / or perforated.
• the furnish in the former 28 may be i) at least partially made from natural fibers, such as northern bleached kraft pulp (NBKP), hardwood pulp (LBKP), abaca fiber pulp, cotton or the like, ii) at least partially from man-made fibers, such as Viscous or the like, iii) at least partially made of synthetic fibers, in particular of polyester, polyamide or the like, iv) at least partially of mineral fibers, in particular glass fibers or the like, v) at least partly of carbon fibers and / or vi) of a mixture of any of the aforementioned substances.
• natural fibers such as northern bleached kraft pulp (NBKP), hardwood pulp (LBKP), abaca fiber pulp, cotton or the like
• man-made fibers such as Viscous or the like
• synthetic fibers in particular of polyester, polyamide or the like
• mineral fibers in particular glass fibers or the like
• the substance entry into the former 28 at least partially consists of fibers which are longer than 2 mm, preferably longer than 3 mm and particularly preferably longer than 4 mm.
• the nonwoven material web before or after the belt press 34 be guided over a vacuum applied suction roll.
• the first exemplary embodiment of the inventively converted device 30 for the production of nonwovens shown in FIG. 2 again comprises a former 28, a hydroentangling device 32, a belt press 34 and a thermal drying device 46, which in the present case For example, it is a TAD or air drying unit.
• the web formed in the former 28 is transferred to the hydroentangling apparatus 32 in a closed loop by the forming wire 48.
• a drying fluid is preferably pressed through the endless belts 40, 42 permeable in this case and through the nonwoven material web 52 by a corresponding pressure difference.
• the roller 36 has an open surface, wherein, as already mentioned, it can be designed in particular as a suction or as a blower roll.
• the hood 44 intended for dispensing or receiving the drying fluid is arranged above the roller 36. As shown, the roller 36 may be associated with a scraper 62.
• FIG. 3 shows a schematic illustration of another exemplary embodiment of a belt press 34 of the device converted according to the invention.
• the hood 44 is arranged above the roller 36 of the belt press 34 for dispensing or receiving the drying fluid.
• an inner endless belt 40 and serving as a press belt 42 outer endless belt 42 is wound around the roller 36 of the belt press 34.
• a scraper 62 associated with the roller 36 of the belt press 34 can be seen again.
• the respective endless belts 40, 42 are guided in the same wrap around the roller 36 of the belt press 34, wherein the wrap angle is expediently slightly larger than the suction or blowing zone 64 of the roller of the belt press 34.
• TAD thermal drying device
• TAD thermal drying device

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• 2014
  • 2014-06-17 EP EP14731241.7A patent/EP3017104B1/de active Active
  • 2014-06-17 WO PCT/EP2014/062621 patent/WO2015000687A1/de active Application Filing
  • 2014-06-17 CN CN201480042662.3A patent/CN105408539B/zh active Active

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