EP1612327A2 - Verbinden von Verbundgeweben - Google Patents

Verbinden von Verbundgeweben Download PDF

Info

Publication number
EP1612327A2
EP1612327A2 EP05104306A EP05104306A EP1612327A2 EP 1612327 A2 EP1612327 A2 EP 1612327A2 EP 05104306 A EP05104306 A EP 05104306A EP 05104306 A EP05104306 A EP 05104306A EP 1612327 A2 EP1612327 A2 EP 1612327A2
Authority
EP
European Patent Office
Prior art keywords
yarns
fabric
matrix material
free
extending
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.)
Withdrawn
Application number
EP05104306A
Other languages
English (en)
French (fr)
Other versions
EP1612327A3 (de
Inventor
Antony Dr. Morton
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Voith Fabrics Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH, Voith Fabrics Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1612327A2 publication Critical patent/EP1612327A2/de
Publication of EP1612327A3 publication Critical patent/EP1612327A3/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21F1/0063—Perforated sheets
    • 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

Definitions

  • the present invention relates to composite fabrics and the jointing of composite fabric ends, and has particular, though not exclusive, reference to the jointing together of the opposed ends of a papermakers dryer fabrics or like industrial fabric so as to bring the same into an endless band.
  • a non-woven membrane which is suitable for use in paper machine clothing and its method of manufacture is described in UK patents GB 2,202,873 (Lefkowitz) and GB 2,235,705 (Lefkowitz).
  • This prior non-woven membrane has a knuckle free planar surface comprising a lattice structure of interconnecting machine and cross-machine direction polymeric structural members residing in a single plane which define a matrix of spaced apertures there between.
  • a proportion of the machine direction lands contain an encapsulated machine direction yarn.
  • the tape is then directed around a tail roller and returned to a position alongside the polymer melt, having first been re-located back on the pinned drum.
  • the edge of the tape is softened, or more specifically, re-melted so that it can combine with the adjacent extrudate.
  • An endless porous sheet results, consisting of continuously joined porous tapes whose boundaries are barely discernable. Given that the attendant machinery is large enough, there is no limit to the size of fabric which can be produced.
  • the membrane can be formed by feeding a respective one of an array of bi-component yarns, the core of which has a higher melting point than that of the sheath, into every second or third peripheral groove of a pinned roller which is arranged in nip forming relationship with a press roll.
  • the material of the sheath is first melted and then the yarns move into and through the roller nip whereupon the melted sheath material is forced into lateral grooves and the vacant longitudinal grooves in the roller.
  • the melted material sets to provide the machine and cross-machine structural members to the finished membrane.
  • dryer fabric seaming was effected either by sewing, or otherwise securing, a substrate carrying laterally extending loops to each of respective fabric ends or by folding back and sewing the fabric edges to create a seam and inserting a spiral, the loops at the respective ends being interdigitated and a pintle wire introduced into the tunnel formed by the interdigitated loops to hold the ends together.
  • Another well practised procedure is to "weave-back" free warp ends into the body of the fabric and in so doing form loops from the individual warp yarns at the ends of the fabric, which can then be interdigitated and a pintle wire introduced as described above.
  • a preformed spiral yarn can be inserted into the aforementioned said loops and used to seam the fabric.
  • EP 0,399,674 discloses a method of seaming a composite dryer fabric which is an adaptation of the technique of weaving back the free warp yarns of a woven fabric.
  • naked machine direction yarns extend from either end of the composite fabric, these free yarn ends are folded back upon themselves and encapsulated on a moulding plate, to provide free loops at either end of the fabric which can be interdigitated and a pintle inserted therein to render the fabric endless.
  • the above described method is not ideal for joining composite fabric ends, in that the seam region is provided with a double layer of monofilament yarn, which can make the fabric stiff in the seam area and therefore more difficult to install on a machine.
  • a composite fabric comprising spaced apart linear yarns extending in the longitudinal plane of the fabric, wherein at least some of said yarns are turned back and extend at least partially back through the fabric in said spaced apart relationship, wherein the yarns are interconnected and encapsulated by a homogeneous matrix material leaving free loops extending from at least one end of the matrix material which are formed by the apexes of the turned back yarns.
  • the turned back portion of the yarn within the matrix material may be connected to a separate yarn running along the same line and at a position remote from the fabric end.
  • the open part of the loop may extend in a substantially transverse plane to the longitudinal extent of the fabric. This enables easy interdigitation of opposed fabric ends and insertion of a pintle wire to make a longer and/or endless fabric. By controlling the sizes of fabric lengths added on, an endless fabric of the desired length can be readily constructed.
  • the matrix material may have apertures therein in lateral offset disposition relative to the yarns and extending throughout the fabric.
  • a method of manufacture of a jointed or seamed composite fabric comprising the steps of making a first strip of fabric by providing an array of spaced apart yarns extending in a first plane, turning back at least some of the yarns in order that they extend at least partially back in said spaced apart relationship in said plane, and encapsulating said yarns in a homogeneous matrix material to leave free loops extending from one end of the matrix material formed by the apex of the turned back yarns.
  • the step of encapsulation involves leaving free yarns protruding from the other end of the matrix material.
  • the method further includes the steps of providing a second strip of fabric by providing a corresponding second array of spaced apart yarns extending in a first plane and encapsulating said yarns in said matrix material to leave free yarns protruding from at least one end of the matrix material.
  • the method may further involve the step of joining opposed ends of the first and second fabric portions of the fabric to make a longer fabric by placing in contact a respective free yarn of one portion with a respective corresponding free yarn of the other portion and interconnecting and encapsulating said contacting yarns in said matrix material to form a homogeneous length of fabric.
  • the step of interconnecting said contacting free yarns also includes the step of joining said free yarns before encapsulation in said matrix material. In one embodiment respective joints of the yarns are not substantially aligned. This has the advantage of reducing areas of localised weakness.
  • the method may include the step of joining the opposed loop bearing ends of two first sections of fabric by interdigitating the loops of the opposed ends and then interconnecting the two portions with a pintle.
  • the method further includes the step of providing a plurality of apertures in the matrix material in lateral offset disposition relative to the yarns and extending throughout the material.
  • the apertures may be formed during the encapsulation of the yarns by placing each of the array of yarns and/or turned back yarns and/or joined yarns into a respective groove of a mould comprising upstanding pins serving to form said apertures in said material and then encapsulating the yarns, within the matrix material of the mould.
  • a composite fabric is constructed in accordance with one of the methods disclosed in GB 2,202,873 or GB 2,235,705, as described earlier.
  • the fabric comprises a knuckle free non-woven membrane 2 as best illustrated in Fig. 1, having a planar surface comprising a lattice structure of interconnecting machine and cross-machine direction polymeric structural members 4, 6 residing in a single plane which define a matrix of spaced apertures 8 therebetween.
  • Each of the machine direction (md) lands 4 contains an encapsulated md yarn 10.
  • the membrane 2 forms the main body of the fabric.
  • a length 10A of each yarn 10 is left free at each end of the membrane, the length of the free portion of the yarns 10A being in the range of 1 to 500mm, typically 50mm.
  • a jointing strip 12 as best illustrated in Fig. 2, of a similar construction to main body 2 is also formed such that it has the same width, as measured in the intended cross-machine direction, and the same thickness as that of membrane 2.
  • the jointing strip 12 however is likely to be of a much shorter length, that is typically 5 to 500 cm, when measured in the intended machine direction. Similar to the main body 2 the jointing strip 12 has free yarns 10A extending from one end thereof, but has loops 14 formed from the yarns 10 extending from the opposite edge thereof.
  • the jointing strip 12 is formed on a pinned mould plate 11 having a plurality of upstanding pins 13 having the same configuration as that of the pinned drum used to construct the main body of the fabric.
  • the yarns would initially be placed through alternative grooves 15 of the mould plate (Fig. 3) and then looped back and passed through the respective adjacent empty groove 17 prior to being encapsulated in the polymeric material to provide lattice membrane structure with embedded md yarns. This fixes the loops in place such that they protrude from one edge of the membrane structure, substantially in a transverse plane to the longitudinal extent thereof as illustrated in Fig. 2. It also leaves free yarns 10A extending from, the opposite edge of the membrane structure.
  • the jointing strip 12 is then joined to the main body 2, by overlapping their respective protruding yarns 10A and interlocking these yarns together.
  • Each pair of joined yarns is placed in a respective groove of a pinned mould plate, whose upstanding pins have the same effective configuration as that of the pinned roller.
  • These yarns are then embedded in the molten matrix material using whichever method has been chosen.
  • the resultant machine and cross-machine direction lands formed are consistent with those the main body 2 and the jointing strip 12. This provides a like permeability characteristic to this region, when compared to that of the remainder of the fabric, and with the machine-direction yarns encapsulated within the md lands provides an invisible joint between the main body 2 and the jointing strip 12.
  • a similar jointing strip 12 is joined to the opposite end of the main body 2 in the same manner to form the completed composite fabric.
  • the composite fabric can be formed into an endless loop by interdigitating the loops 14 at the opposing ends and interconnecting such with a pintle in a known manner.
  • the loops 14 at one end tilt to one side, whilst the loops of the opposite end have a complementary tilt such that they evenly overlap when interdigitated.
  • Methods of joining the free yarns 10A of the main body 2 and jointing strip 12 could include techniques such as ultrasonic welding chemical bonding adhesive means, crimping and other mechanical means.
  • the jointing of the yarns may also be staggered with respect to the width of the fabric, to avoid a line of localised weakness.
  • the individual joints have been illustrated in Fig. 4 in such a staggered manner.
  • the free yarns have been described as being overlapped before interconnection, they may alternatively be laser welded. In this instance, for example, near infrared (NIR) e.g. CO 2 laser could be used, aided by a thin layer of material which concentrates the laser energy at the interface. Further it is possible to use diode lasers or ionic diode lasers.
  • NIR near infrared
  • jointing strip has been described as being formed on a pinned mould plate, it could alternatively be produced on the other means such as on a pinned roller.
  • cross-machine direction yarns may additionally be provided in some or all of the cross-machine direction lands.
  • other cross-machine direction support could be included.
  • the matrix material of the fabric may be formed from polymeric materials such as polyesters, polyamides, polyimides polyolefines, PPS, PCTA, polyurethane and rubber based materials. These would typically be processed by some sort of melt processing, as would in general be applied to thermoplastic systems. In some cases it may be desirable to secondary cure the finished product to give a thermoset, e.g. through the use of electromagnetic irradiation.
  • the matrix material is being added into the mould plate or pinned roller such could be provided in a particulate, or liquid form or indeed a sheet of such material which is then brought into liquid form by application of heat.

Landscapes

  • Woven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP05104306A 2004-06-28 2005-05-20 Verbinden von Verbundgeweben Withdrawn EP1612327A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004031213A DE102004031213A1 (de) 2004-06-28 2004-06-28 Verbinden von Verbundtextilstoffen

Publications (2)

Publication Number Publication Date
EP1612327A2 true EP1612327A2 (de) 2006-01-04
EP1612327A3 EP1612327A3 (de) 2006-09-20

Family

ID=35056886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05104306A Withdrawn EP1612327A3 (de) 2004-06-28 2005-05-20 Verbinden von Verbundgeweben

Country Status (3)

Country Link
US (1) US20060010932A1 (de)
EP (1) EP1612327A3 (de)
DE (1) DE102004031213A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016005083A1 (de) * 2014-07-10 2016-01-14 Voith Patent Gmbh Extrudierte papiermaschinenbespannung und verfahren zur deren herstellung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469651A (en) * 2009-04-21 2010-10-27 Allan Richard Manninen Seaming device for an industrial fabric

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8911033D0 (en) * 1989-05-13 1989-06-28 Scapa Group Plc Jointing of fabric ends
GB2254287B (en) * 1991-04-05 1994-10-12 Scapa Group Plc Papermakers fabric
US5601120A (en) * 1996-01-30 1997-02-11 Asten, Inc. Pin seam with double end loops and method
US8840683B2 (en) * 2003-11-19 2014-09-23 Albany International Corp. Industrial textile fabric

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016005083A1 (de) * 2014-07-10 2016-01-14 Voith Patent Gmbh Extrudierte papiermaschinenbespannung und verfahren zur deren herstellung
CN106661835A (zh) * 2014-07-10 2017-05-10 福伊特专利有限公司 挤出的造纸机网毯和其制造方法
US10501889B2 (en) 2014-07-10 2019-12-10 Voith Patent Gmbh Extruded paper machine clothing and method for the production thereof

Also Published As

Publication number Publication date
DE102004031213A1 (de) 2006-01-19
EP1612327A3 (de) 2006-09-20
US20060010932A1 (en) 2006-01-19

Similar Documents

Publication Publication Date Title
CA1309853C (en) Nonwoven fabric and method of manufacture
US8801880B2 (en) Formation of a fabric seam by ultrasonic gap welding of a flat woven fabric
EP2938779B1 (de) Verfahren zum schweissen eines nahtbereichs eines industriegewebes mit ultraschallschweissen
EP2938780B1 (de) Technisches gewebe mit spiralförmig gewickelten materialbahnen und verfahren zur herstellung davon
US8563114B2 (en) Industrial fabric comprised of selectively slit and embossed film
EP2376691B1 (de) Technisches flächengebilde mit spiralförmig gewickelten materialstreifen
CA2406859C (en) Base structure for seamed papermaker's fabrics
EP2847380B2 (de) Technisches gewebe mit spiralförmig gewickelten materialbahnen mit verstärkung
EP1789627B1 (de) Halbdurchlässige gewebe für transferbänder- und pressfilzenanwendungen
EP1612327A2 (de) Verbinden von Verbundgeweben
EP1015688B1 (de) Verbesserungen beim pressband für breit-nip-pressen
EP1699975B1 (de) Verfahren und vorrichtung zur nahtbildung in einer papiermaschinenbespannung und mit einer naht versehene papiermaschinenbespannung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR LV MK YU

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH PATENT GMBH

17P Request for examination filed

Effective date: 20070320

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR

17Q First examination report despatched

Effective date: 20080219

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20080701