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US20070028997A1 - Forming fabric for use in a paper machine, and method and apparatus for manufacturing such a forming fabric - Google Patents

Forming fabric for use in a paper machine, and method and apparatus for manufacturing such a forming fabric Download PDF

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Publication number
US20070028997A1
US20070028997A1 US11/498,275 US49827506A US2007028997A1 US 20070028997 A1 US20070028997 A1 US 20070028997A1 US 49827506 A US49827506 A US 49827506A US 2007028997 A1 US2007028997 A1 US 2007028997A1
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United States
Prior art keywords
yarns
forming fabric
fabric according
another
planar structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US11/498,275
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English (en)
Inventor
Walter Best
Christian Molls
Paul Wales
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heimbach GmbH and Co KG
Original Assignee
Heimbach GmbH and Co KG
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Filing date
Publication date
Application filed by Heimbach GmbH and Co KG filed Critical Heimbach GmbH and Co KG
Assigned to HEIMBACH GMBH & CO. KG reassignment HEIMBACH GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MOLLS, CHRISTIAN, BEST, WALTER, WALES, PAUL
Publication of US20070028997A1 publication Critical patent/US20070028997A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/344—Stretching or tensioning the joint area during joining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/69—General aspects of joining filaments 
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0054—Seams thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2313/00—Use of textile products or fabrics as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/14—Filters

Definitions

  • the invention relates to a forming fabric, for use in the sheet-forming section of a paper machine, having or comprising a textile planar structure in which crossing yarns are engaged into one another at crossing points and in which, in order to enhance inherent stability, yarns are fused to one another at crossing points.
  • the invention further relates to a method for manufacturing such forming fabrics, in which method a textile planar structure is manufactured from yarns that intersect one another and are engaged into one another at crossing points, and in which yarns are then fused to one another at crossing points by heating to melting temperature.
  • the invention also refers to an apparatus for manufacturing a forming fabric of this kind.
  • Forming fabrics are long, wide belts that circulate in the first part of a paper machine, called the sheet-forming section, forming a flat upper run.
  • the previously prepared fiber pulp is applied onto the forming fabric and dewatered through the forming fabric, so that a paper web still having a high liquid content is gradually formed.
  • the paper web is further dewatered mechanically and thermally.
  • Single- or multiple-layer woven fabrics are generally used as forming fabrics.
  • a woven fabric (or even a knitted fabric) obtains its inherent stability or diagonal stability from the fact that crossing yarns are engaged into one another, forming a weave pattern.
  • the inherent stability of the textile planar structure is not sufficient to ensure stable and problem-free circulation of the forming fabric through the sheet-forming section. Additional measures have therefore been taken in order to improve the dimensional stability, in particular the diagonal stiffness, of such textile planar structures.
  • One of these measures consists in adhesively bonding the yarns to one another at the crossing points, by the fact that the fabric structure is equipped with adhesive polymers. This method is cost-intensive because the dispersion must be applied very evenly, and because drying consumes a great deal of time and energy. Permeability is furthermore considerably decreased, which has a negative effect on the sheet-forming process. A further disadvantage is the fact that the adhesion at all crossing points resulting from this method causes a stiffening that is often not desired.
  • U.S. Pat. No. 5,888,915 A proposes, in order to improve the dimensional stability of such textile planar structures, to use bicomponent yarns in which the melting temperature of the outer casing is lower than that of the core.
  • a woven or knitted fabric or yarn layer equipped with bicomponent yarns of this kind is then heated, in a continuous furnace, to a temperature that is above the melting temperature of the outer casing of the bicomponent yarns, but below the melting temperature of the core of those yarns, so that the casing melts and a fused or adhesive bond to other yarns is produced in this fashion at the crossing points.
  • Forming fabrics having good dimensional stability can be manufactured using this method.
  • Manufacture is costly, however, since the bicomponent yarns are expensive, and heating of the entire forming fabric in a continuous furnace is energy-intensive.
  • the longitudinal and transverse yarns are fused to one another at crossing points as a consequence of a heating to melting temperature that is confined to those crossing points.
  • the heating can be applied in single-point fashion by means of high-frequency, inductive, and/or laser energy.
  • the energy can also be applied in planar fashion if the crossing points are first equipped with an additive that promotes absorption of the energy and that concentrates energy uptake at the crossing points despite the planar application, so that only those points are heated to melting temperature and consequently fused to one another.
  • the additive should be a light-absorbing dye, e.g. black dye, or a photoactive substance.
  • the additive can be applied between the yarns or onto the yarns. It is also proposed instead to add the additive to the yarn material during the extrusion operation.
  • a further object is to make available a method suitable for manufacture, and an apparatus therefor.
  • the first object is achieved, according to the present invention, by a forming fabric in which the planar structure comprises crossing first and second yarns, the first yarns having the property that they absorb laser energy and can be brought, by absorbed laser energy, to melting temperature at least at the surface; and in which first and second yarns are fused to one another at at least some of their crossing points. For many situations it is sufficient if only some of the first and second yarns are welded to one another, and those only at some of their crossing points.
  • the basic idea of the invention is therefore to use for some of the yarns, in the context of a forming fabric, particular yarns which are distinguished by the fact that they absorb laser light.
  • the textile planar structure can be additionally stabilized by the fact that the first yarns are heated by means of a laser to melting temperature, and at at least some of the crossing points (if not at all) a fused join is thus produced with the second yarns, which absorb only little or no laser light.
  • This manner of producing the fused join is substantially less time-consuming and energy-intensive than the known methods, especially since the first yarns themselves require little additional cost.
  • a further advantage consists in the fact that the dimensional stability can be individually adapted to particular requirements by correspondingly varying the number of first yarns as well as the number of crossing points at which welding or fusing is performed. This is because in many cases, a forming fabric that is too stiff and therefore insufficiently adaptable is also disadvantageous.
  • the first yarns can contain an additive that imparts the ability to absorb laser light.
  • additives are near-infrared-active (NIR-active) substances that absorb, for example, in the region of the wavelengths 808 nm, 940 nm, 980 nm, or 1064 nm. Suitable for this are, for example, carbon or colorless additives such as Gentex's Clearweld® or BASF's Lumogen® IR.
  • the additive preferably extends over the entire length of the first yarns and is evenly distributed over the length and cross section.
  • the additive can be incorporated into the first yarns and/or applied onto the surface of the first yarns and/or introduced at the crossing points between the first and second yarns. If the additive is incorporated, the proportions by weight should be approximately 0.10% to 2.5%.
  • the first yarns prefferably be bicomponent yarns, only one of the two components containing the additive.
  • the bicomponent yarns should preferably comprise a core and a casing surrounding it, the additive then being contained only in the casing.
  • Planar structures suitable according to the present invention are those in which crossing yarns are engaged with one another, as is the case, for example, with woven and knitted fabrics.
  • the planar structure should preferably comprise longitudinal and transverse yarns, in which context the first yarns can extend only in the longitudinal direction, only in the transverse direction, or in both directions. Depending on the dimensional stability requirements, only some of the longitudinal and/or transverse yarns can then also be embodied as first yarns.
  • the first yarns should preferably be part of the weave of the yarns in the planar structure, i.e. should not have been additionally introduced into the existing woven fabric, knitted fabric, etc., in order not to disrupt the desired yarn distribution and structure. It is definitely useful if the first yarns are distributed in the planar structure in a consistently regular pattern.
  • the first yarns are, if possible, advantageously engaged into the planar structure in such a way that they do not reach as far as the paper side of the forming fabric. If the planar structure is embodied with multiple plies, the first yarns should be engaged only in an internally located layer and/or a roller-side layer.
  • Possible materials for the yarns are any type of thermoplastic material that is suitable for the respective application, i.e. that permanently withstands the respective ambient conditions in the paper machine.
  • at least the first yarns, but better yet all the yarns can be embodied as single-component yarns that can additionally be fiber-reinforced; i.e. individual yarns, or all the yarns, can contain a fiber reinforcement.
  • Forming fabrics have a finite length, with ends joinable via a seam.
  • first yarns In the region of the two ends, i.e. in the seam region, first yarns should be present that extend in the transverse direction and are welded to second yarns extending in the longitudinal direction.
  • the first yarns In order to achieve particularly high strength there, the first yarns should be present in a higher concentration in the seam region than in the remaining region of the forming fabric, and the first and second wires should be welded to one another at as many crossing points as possible.
  • the longitudinal yarns inserted in correctly woven fashion into the respectively opposite end during the stitching process are then fused to the first yarns. This creates the possibility of shortening the seam region without thereby impairing the strength of the seam. In this fashion the seam region can be reduced from a usual extension of, for example, 100 mm in the longitudinal direction to, for example, 60 mm, i.e. the seam region can be shortened by 20-60% in the machine direction.
  • the second object is achieved, according to the invention, by a method in which first and second yarns are used in the manufacture of the planar structure, in which context the first yarns can absorb laser energy; and in which first and second yarns are fused by means of laser energy at at least some of their crossing points or at all their crossing points.
  • Welding of the first and second yarns at the crossing points can occur in a consistently regular pattern, but also in stochastically distributed fashion.
  • a further possibility is that of guiding the laser over the forming fabric in a diagonal direction, the angle between the diagonal direction and the transverse direction being selected so that the first and second yarns are fused to one another at as many crossing points as possible.
  • the laser can follow the weave ridges of the fabric weave.
  • the distances between the laser tracks can be selected, in the longitudinal direction, depending on the desired embodiment. Regardless thereof, it is not excluded for the laser to be guided over the forming fabric in spiral tracks.
  • the laser first shines through the second yarn before striking the first yarn.
  • the concentration of the additive in the first yarns, and the energy of the laser, should be correlated in such a way that the first yarns are melted only at the surface facing toward the laser, so that there is only a slight negative effect on the structure and shape of the yarns.
  • the third part of the object is achieved, according to the present invention, by an apparatus that comprises a tensioning device with which the forming fabric, rendered endless, is stretchable; and such that a laser device having at least one laser head is associated with the tensioning device in such a way that at least one laser beam is directable onto the forming fabric in the stretched state; and that the tensioning device and laser device are embodied in such a way that a relative motion is producible between the forming fabric and laser beam.
  • first and second yarns can be welded to one another by means of the at least one laser head.
  • tensioning device Particularly suitable as a tensioning device are two spaced-apart tensioning rollers with which a longitudinal tension is impartable to the forming fabric pulled onto the tensioning rollers, for example by the fact that the spacing of the tensioning rollers is modifiable.
  • At least one of the tensioning rollers should be connected to a drive motor in such a way that a forming fabric pulled onto the tensioning rollers can be caused to circulate continuously or in steps, in which context the drive motor can also be embodied reversibly.
  • the at least one laser head is movably guided transversely with respect to the forming fabric pulled onto the tensioning device, and preferably over the entire width of the tensioning device.
  • the at least one laser head should also be movably guided longitudinally with respect to the forming fabric pulled onto the tensioning device. This can usefully be done in such a way that the at least one laser head is supported on a guide rail that extends transversely with respect to the forming fabric and is displaceable in the longitudinal direction of the forming fabric, the forming fabric being in each case pulled onto the tensioning device.
  • a programmable control device for controlling the tensioning device and laser device and their motors for moving, for example, the tensioning rollers and/or the laser head.
  • This control device can additionally be combined with a sensor that is mounted on the laser device and serves to sense yarns of the forming fabric that differ from the other yarns of the forming fabric in terms of a property that can be sensed by the sensor.
  • the sensor can be, for example, an optoelectronic sensor (photocell) if the first yarns of the forming fabric according to the present invention have a different color and/or a different brightness from the second yarns.
  • the sensor allows the first yarns to be located, and allows the laser to be moved to the locations designated for welding.
  • the invention is illustrated in more detail in the drawing, with reference to an exemplifying embodiment.
  • the drawing shows, in an oblique view, an apparatus for partial manufacture of forming fabric 2 according to the present invention.
  • Forming fabric 2 was previously woven in a finite length, and its ends were then stitched to one another so that an endless structure was produced. Forming fabric 2 was then stretched between two rollers 3 , 4 arranged at a distance from one another, one of the rollers being movably guided in such a way that forming fabric 2 acquires a specific longitudinal tension. At least one of rollers 3 , 4 is driven clockwise in motorized fashion. Upon activation of the drive system, forming fabric 2 is moved at a predetermined speed in the direction of arrow A, while rollers 3 , 4 execute a rotary motion in the direction of arrow B, C. It is understood that rollers 3 , 4 are supported in an apparatus frame (not depicted in further detail) in which the drive system is also housed.
  • Forming fabric 2 was manufactured in a finite length, and was converted into the endless form shown by way of a seam joining the ends.
  • Forming fabric 2 is made of a woven fabric that, in this embodiment, comprises longitudinal yarns (labeled 5 by way of example) extending in the machine direction (arrow A) and transverse yarns (labeled 6 by way of example) extending perpendicular thereto.
  • Longitudinal and transverse yarns 5 , 6 are produced from a thermoplastic that is usual for use in forming fabrics, and constitute second yarns for purposes of the present description. Longitudinal and transverse yarns 5 , 6 are engaged into one another in accordance with a specific weave pattern.
  • Transverse yarns 7 are engaged into longitudinal yarns 5 and are part of the weave pattern. They constitute first yarns for purposes of the present description. They contain an additive that makes them capable of absorbing laser energy, so that they can be brought to melting temperature with the aid of a laser beam.
  • a laser apparatus 8 is arranged above the plane of rollers 3 , 4 .
  • Laser apparatus 8 has longitudinal rails 9 , 10 (depicted only in shortened fashion here) that extend, parallel to one another, parallel to the plane of rollers 3 , 4 and above them, and are immovably joined to the apparatus frame.
  • Longitudinal rails 9 , 10 have a spacing that is larger than the width of forming fabrics 2 that are to be processed in apparatus 1 .
  • transverse rail 11 Mounted displaceably in the directions of double arrow D on longitudinal rails 9 , 10 is a transverse rail 11 . It extends perpendicular to longitudinal rails 9 , 10 and thus parallel to the axes of rollers 3 , 4 .
  • a transverse rail 11 Mounted on transverse rail 11 via an arm 12 is a laser 13 , which can be displaced back and forth on transverse rail 11 in the directions of double arrow E. It can furthermore be pivoted about the longitudinal axis of transverse rail 11 in the directions of double arrow F.
  • the movements of transverse rail 11 relative to longitudinal rails 9 , 10 , and the movement of laser head 13 relative to transverse rail 11 are brought about by means of motors (not depicted here in further detail).
  • Apparatus 1 comprises a programmable control device (likewise not depicted here in further detail), similar to a CNC controller, with which the individual motors for moving laser head 13 and rollers 3 , 4 can be controlled, and laser head 13 can be activated.
  • laser head 13 is moved only in the transverse direction via transverse rail 11 .
  • Rollers 3 , 4 are halted when a first transverse yarn 7 comes to rest below laser head 13 .
  • Laser head 13 is then guided along transverse yarn 7 over the width of forming fabric 2 , and activated at the positions designated for welding.
  • transverse yarn 7 heats up at the surface to melting temperature, with the consequence that it fuses to longitudinal yarns 5 at crossing points 14 , so that a welded join is produced there after cooling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Filtering Materials (AREA)
  • Making Paper Articles (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
US11/498,275 2005-08-04 2006-08-03 Forming fabric for use in a paper machine, and method and apparatus for manufacturing such a forming fabric Abandoned US20070028997A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05017006A EP1749924B1 (de) 2005-08-04 2005-08-04 Formiersieb für den Einsatz in einer Papiermaschine sowie Verfahren zur Herstellung eines solchen Formiersiebes
EP050170067 2005-08-04

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US20070028997A1 true US20070028997A1 (en) 2007-02-08

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US (1) US20070028997A1 (pt)
EP (1) EP1749924B1 (pt)
CN (1) CN1908297A (pt)
AT (1) ATE378461T1 (pt)
BR (1) BRPI0603075B1 (pt)
CA (1) CA2552009C (pt)
DE (1) DE502005001993D1 (pt)
ES (1) ES2294609T3 (pt)
PT (1) PT1749924E (pt)
RU (1) RU2337199C2 (pt)
ZA (1) ZA200606449B (pt)

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US20090061151A1 (en) * 2007-09-05 2009-03-05 Lafond John J Formation of a fabric seam by ultrasonic gap welding of a flat woven fabric
US20090139599A1 (en) * 2007-09-05 2009-06-04 Dana Eagles Process for producing papermaker's and industrial fabric seam and seam produced by that method
US20090288731A1 (en) * 2007-04-12 2009-11-26 Woongjin Chemical Co, Ltd 3d fabric and preparing thereof
US20100024178A1 (en) * 2007-09-05 2010-02-04 Robert Hansen Process for Producing Papermaker's and Industrial Fabric Seam and Seam Produced by that Method
US20130007999A1 (en) * 2011-07-06 2013-01-10 Ashish Sen Seaming process for pmc fabric having monofilament yarns
US20130264318A1 (en) * 2009-01-28 2013-10-10 Albany International Corp. Industrial Fabric for Producing Tissue and Towel Products, and Method of Making Thereof
US8591703B2 (en) * 2011-07-06 2013-11-26 Voith Patent Gmbh Monofilament yarn for a paper machine clothing fabric
US20150096704A1 (en) * 2012-04-24 2015-04-09 Voith Patent Gmbh Stabilized woven seam for flat-weave endless fabric belts
EP2702203B1 (de) 2011-02-24 2015-06-17 Voith Patent GmbH Stabilisierte webnaht für flachgewebte endlosgewebebänder
US9771684B2 (en) 2013-12-17 2017-09-26 Voith Patent Gmbh Woven fabric belt for a fibrous-web machine
WO2019063518A1 (de) * 2017-09-27 2019-04-04 Voith Patent Gmbh Bespannung
WO2020076534A1 (en) * 2018-10-10 2020-04-16 Astenjohnson, Inc. Pintle insertion tool
US20210071364A1 (en) * 2019-05-22 2021-03-11 First Quality Tissue Se, Llc Woven base fabric with laser energy absorbent md and cd yarns and tissue product made using the same
WO2021236366A1 (en) 2020-05-19 2021-11-25 Astenjohnson, Inc. Seam for an industrial textile with energy absorbent yarns
US11332854B2 (en) 2013-07-17 2022-05-17 Voith Patent Gmbh Clothing and method for producing a clothing

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US20090288731A1 (en) * 2007-04-12 2009-11-26 Woongjin Chemical Co, Ltd 3d fabric and preparing thereof
US7694696B2 (en) * 2007-04-12 2010-04-13 Woongjin Chemical Co., Ltd. 3D fabric and preparing thereof
JP2010538178A (ja) * 2007-09-05 2010-12-09 オルバニー インターナショナル コーポレイション 製紙用および工業用の布の製造方法
US8062480B2 (en) * 2007-09-05 2011-11-22 Albany International Corp. Process for producing papermaker's and industrial fabric seam and seam produced by that method
WO2009032628A3 (en) * 2007-09-05 2009-05-07 Albany Int Corp Process for producing papermaker's and industrial fabrics
US20100024178A1 (en) * 2007-09-05 2010-02-04 Robert Hansen Process for Producing Papermaker's and Industrial Fabric Seam and Seam Produced by that Method
US20090061151A1 (en) * 2007-09-05 2009-03-05 Lafond John J Formation of a fabric seam by ultrasonic gap welding of a flat woven fabric
US7794555B2 (en) 2007-09-05 2010-09-14 Albany International Corp. Formation of a fabric seam by ultrasonic gap welding of a flat woven fabric
US8801880B2 (en) 2007-09-05 2014-08-12 Albany International Corp. Formation of a fabric seam by ultrasonic gap welding of a flat woven fabric
US20100323148A1 (en) * 2007-09-05 2010-12-23 Albany International Corp. Formation of a fabric seam by ultrasonic gap welding of a flat woven fabric
US7897018B2 (en) 2007-09-05 2011-03-01 Albany International Corp. Process for producing papermaker's and industrial fabrics
US20090139599A1 (en) * 2007-09-05 2009-06-04 Dana Eagles Process for producing papermaker's and industrial fabric seam and seam produced by that method
US8088256B2 (en) * 2007-09-05 2012-01-03 Albany International Corp. Process for producing papermaker's and industrial fabric seam and seam produced by that method
US20120031554A1 (en) * 2007-09-05 2012-02-09 Albany International Corp. Process for Producing Papermaker's and Industrial Fabric Seam and Seam Produced by that Method
EP3550073A1 (en) * 2007-09-05 2019-10-09 Albany International Corp. Process for producing papermaker's and industrial fabrics
TWI489025B (zh) * 2007-09-05 2015-06-21 Albany Int Corp 處理纖維/紗線或單纖紗以及處理造紙機、工業或經工程化織物之方法，以及其所產生之產品
KR101515783B1 (ko) 2007-09-05 2015-05-04 알바니 인터내셔널 코포레이션 제지산업용 직물의 제조방법
US8647474B2 (en) * 2007-09-05 2014-02-11 Albany International Corp Process for producing papermaker's and industrial fabric seam and seam produced by that method
US20090056900A1 (en) * 2007-09-05 2009-03-05 O'connor Joseph G Process for producing papermaker's and industrial fabrics
US8801903B2 (en) * 2009-01-28 2014-08-12 Albany International Corp. Industrial fabric for producing tissue and towel products, and method of making thereof
US20180155874A1 (en) * 2009-01-28 2018-06-07 Albany International Corp. Industrial Fabric for Production of Nonwovens, and Method of Making Thereof
US20130264318A1 (en) * 2009-01-28 2013-10-10 Albany International Corp. Industrial Fabric for Producing Tissue and Towel Products, and Method of Making Thereof
EP2702203B1 (de) 2011-02-24 2015-06-17 Voith Patent GmbH Stabilisierte webnaht für flachgewebte endlosgewebebänder
US8591703B2 (en) * 2011-07-06 2013-11-26 Voith Patent Gmbh Monofilament yarn for a paper machine clothing fabric
US20130007999A1 (en) * 2011-07-06 2013-01-10 Ashish Sen Seaming process for pmc fabric having monofilament yarns
US20150096704A1 (en) * 2012-04-24 2015-04-09 Voith Patent Gmbh Stabilized woven seam for flat-weave endless fabric belts
US9714483B2 (en) * 2012-04-27 2017-07-25 Voith Patent Gmbh Stabilized woven seam for flat-weave endless fabric belts
US11332854B2 (en) 2013-07-17 2022-05-17 Voith Patent Gmbh Clothing and method for producing a clothing
US9771684B2 (en) 2013-12-17 2017-09-26 Voith Patent Gmbh Woven fabric belt for a fibrous-web machine
WO2019063518A1 (de) * 2017-09-27 2019-04-04 Voith Patent Gmbh Bespannung
US11280048B2 (en) 2017-09-27 2022-03-22 Voith Patent Gmbh Fabric
WO2020076534A1 (en) * 2018-10-10 2020-04-16 Astenjohnson, Inc. Pintle insertion tool
US11332879B2 (en) 2018-10-10 2022-05-17 Astenjohnson International, Inc. Pintle insertion tool
US20210071364A1 (en) * 2019-05-22 2021-03-11 First Quality Tissue Se, Llc Woven base fabric with laser energy absorbent md and cd yarns and tissue product made using the same
US12180654B2 (en) * 2019-05-22 2024-12-31 First Quality Tissue Se, Llc Woven base fabric with laser energy absorbent MD and CD yarns and tissue product made using the same
WO2021236366A1 (en) 2020-05-19 2021-11-25 Astenjohnson, Inc. Seam for an industrial textile with energy absorbent yarns

Also Published As

Publication number Publication date
EP1749924A1 (de) 2007-02-07
ZA200606449B (en) 2007-05-30
DE502005001993D1 (de) 2007-12-27
ES2294609T3 (es) 2008-04-01
BRPI0603075A (pt) 2008-03-18
BRPI0603075B1 (pt) 2016-09-27
CA2552009C (en) 2009-04-07
PT1749924E (pt) 2008-01-24
RU2006128331A (ru) 2008-02-20
EP1749924B1 (de) 2007-11-14
RU2337199C2 (ru) 2008-10-27
CA2552009A1 (en) 2007-02-04
ATE378461T1 (de) 2007-11-15
CN1908297A (zh) 2007-02-07

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