WO1979000026A1 - Procede pour former une jonction dans un tissu a deux couches - Google Patents

Procede pour former une jonction dans un tissu a deux couches

Info

Publication number
WO1979000026A1
WO1979000026A1 PCT/SE1978/000006 SE7800006W WO7900026A1 WO 1979000026 A1 WO1979000026 A1 WO 1979000026A1 SE 7800006 W SE7800006 W SE 7800006W WO 7900026 A1 WO7900026 A1 WO 7900026A1
Authority
WO
WIPO (PCT)
Prior art keywords
threads
weft threads
zone
warp thread
warp
Prior art date
Application number
PCT/SE1978/000006
Other languages
English (en)
Inventor
I Strandly
Original Assignee
Nordiskafilt Ab
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
Priority claimed from SE7707787A external-priority patent/SE406608B/sv
Application filed by Nordiskafilt Ab filed Critical Nordiskafilt Ab
Priority to BR7808666A priority Critical patent/BR7808666A/pt
Priority to DE19782856951 priority patent/DE2856951A1/de
Publication of WO1979000026A1 publication Critical patent/WO1979000026A1/fr

Links

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
    • D21F1/0054—Seams thereof

Definitions

  • belt fasteners In these types of products so called belt fasteners are used.
  • the loops of these fasteners are of metal and usually U-shaped. They are attached either on the cloth itself or on sepa ⁇ rate fastener strips which are sewn onto the cloth ends.
  • the dryer section In addition to the dryer section there are, however, several other positions in which it is necessary to de ⁇ liver an open cloth the ends of which are to be interconnec- ted directly in the machine. For instance, in Inverform machines the cloth does not as a rule lend itself to end ⁇ less mounting.
  • belt fasteners are unsuitable for use to join together forming fabrics and certain filter types, a number of alternative possibilities have been developed
  • the seam In forming fabrics, it is important that the seam are has approximately the same openness as the rest of the fabric in order to avoid too pronounced marking and to reumble the risk of web breaks. It is likewise important tha the locking loops are designed so as to avoid that they themselves or the warp threads in connection therewith are exposed to more wear than the rest of the fabric.
  • double-layer forming fabrics comprisi two layers of weft threads and warp threads interconnecti these layers have found increasingly wide applications.
  • OMPI Wlr ⁇ also risks of web breaks. Another disadvantage is that the warp thread in connection with the loop formations is ex ⁇ posed on the wear side of the fabric, resulting in in ⁇ creased wear.
  • the present invention relates to a method of providing a row of loops at each end of a forming fabric, filter cloth or similar weave of a kind comprising two layers of weft threads with the threads positioned in pairs substan- tially one on top of the other, and warp threads inter ⁇ connecting the weft layers, said rows of loops intended to be interconnected by a locking wire to form an endless fabric, web.
  • the method of the invention is characterised in removing permanently the weft threads in a first zone closest to one end edge of said fabric, removing temporarily the weft threads in a second zone adjacent said first zone, arranging said temporarily removed weft threads, alternatively a corresponding number of weft threads, together with one coarse folding wire and possibly also one or several thin folding wires as a warp in a sewing machine similar to a loom, of a kind known per se, wherein said coarse wire temporarily replaces said locking wire intended finally to interconnect the two fabric ends, where two warp thread ends in succession in accordance with the pattern repeat bind between the threads of the outermost one of said pairs in said second zone of weft threads, carrying one of said warp thread ends, after having woven said warp thread end into said second zone of weft threads in accordance with the correct weaving pattern, in a loop around said possibly existing thin folding wire (or wires) as well as around said coarse folding wire and thereafter carrying ' said warp thread end in the reverse direction in
  • OMPI after having been. oven into said second zone of weft threads in correct pattern, binds about said outermost pair and possibly the thin folding thread (or threads) and then back in the place of one of the other warp threads to a pick-up point in said second zone of weft threads, at which point the two warp threads meet, whereas the third warp thread end after having been woven into said second zone of weft threads in correct pattern is carried to a pick-up point in connection with the outermost pair of weft threads, where one warp thread end in accordance with the pattern repeat binds between alternatively above or below, .the threads of the outermost one of said pairs in said second zone of weft threads without being followed by a warn thread end having the same alternative binding pattern, carrying said warp thread end, after having woven said warp thread end in accordance with the correct weaving pattern into said second zone of weft threads, around said outermos ' pair of weft threads and possibly said thin folding wire or wires to
  • All loops included in the loop rows that are intended to be joined together by a locking wire are formed when warp threads in accordance with the pattern repeat bind between the weft threads of the outermost pair preceding the seam loop itself. In this manner, the warp thread in connection with the seam loop is well protected against wear. Owing to this arrangement, also the seam loop itself will have less thickness than the rest of the fabric, which also spares the seam loop itself from wear , . Because one or several threads, which may be thin, at need are inserted only in one layer (single layer) between the double-layer fabric and the coarse folding wire, the openness is decreased in this part of the seam, whereby heavy marking is reduced and there are less risks of web breaks.
  • Fig. 1 shows the pattern design of the intended fabric
  • Figs. 2a, 2b, 2c, and 2d show four different stages of producing a seam loop.
  • Figs. 3 to 6 illustrate the method in connection wit all threads of the applied pattern of the fabric.
  • the hori zontal rows 1 and 2 illustrate the weft threads of the weave and the vertical rows 3 the warp threads of the wea
  • Cross yarns 1 form the upper layer of weft threads and cross yarns 2 the lower layer.
  • Blackened squares indicate that the warp thread crosses the respective weft. thread on the upper face. Accordingly, warp thread 3a binds
  • Fig. 2a shows warp thread 3a, permanently freed of weft threads in a first zone 4 at the right-hand part of the Figure.
  • the weft threads have been temporarily removed, and a corresponding number of threads have thereafter been inserted to serve as.
  • the warp in a known sewing machine (not shown) which is similar to a loom.
  • wire section 6 is shown as positioned laterally of the very seam area.
  • a thin extra folding wire 7 as well as a coarser folding wire 8.
  • the shed of the first warp thread 3a is formed in such a manner that weft threads 11b, 11c, 12c, 11d, 11e, 11g and folding wires 7 and 8 form the upper shed whereas weft threads 11a, 12a, 12b, 12d, 11f, 12f, and 12g form the lower shed.
  • the shed is closed in the manner indicated in Fig. 2b.
  • Fig. 2c the following shed is shown, formed in a manner identical with the shed associated with warp thread 3b in accordance with Fig. 1.
  • Warp thread 3a is folded about folding wires 7 and 8 and is reintroduced over a portion of zone 5 to a pick-up location between threads 11a and 11c.
  • the warp thread 3b is inserted in the shed up to the same pick-up location.
  • the shed is again in closed position.
  • Warp thread 3a has formed the seam loop about folding wires 7 and 8.
  • warp thread 3a is shown on the one hand in its regular position and on the other in its re-introduced position after having been folded in the position of warp thread 3b. Both warp threads 3a and 3b, arranged in succession,- weave between threads 11g and 12g of the outermost pair in zone 5.
  • warp threads 3d and 3e both weave between weft threads 1g and 2g of the outermost pair in zone 5.
  • One of these warp threads e.g. warp thread 3d
  • warp thread 3d is inserted, as illu ⁇ strated in Fig. 5, first in zone 5 and is thereafter carri in a loop around the thin folding wire 7 as well as the coarse folding wire 8 back into zone 5 in the position of the second warp thread 3e up to an appropriate pick-up location (not. shown), where the warp thread 3d meets warp thread 3e.
  • the loop 9b thus formed like loop 9a formed by warp threads 3a, serve as seam loops for the final joining together of the fabric ends.
  • Warp threads 3f and 3g weave in accordance with the pattern repeat design of Fig. ' 1 respectively above and bel the weft threads 1g and 2g of the outermost pair in zone 5
  • One of these warp threads, e.g. warp thread 3f is, as illustrated in Fig. 6, woven first into zone 5 and is thereafter carried around the thin folding wire 7 back into zone 5 in the position of the second warp thread 3g up to an appropriate pick-up location (not shown), where warp thread 3f meets warp thread 3g. In this case no seam loop is formed around folding wire 8.
  • the warp threads in connection with the seam loops as well as the same loops themselves are in positions wherein they are well protected against wear.
  • the additional folding wires, which are. re ⁇ tained in position by the warp threads that do not form seam loops, may be adjusted to ensure the correct size of the seam loops, in addition to which the openness is reduced to avoid pronounced marking and risks that web breaks may occur.
  • the invention is applicable to most double-layer fabrics of various patterns and is especially suitable for fabrics having non-symmetric patterns wherein the warp thread weaves differently in the two weft yarn layers.
  • the weaving pattern according to Fig. 1 is formed so that the warp threads 3a, 3d and 3f after having been folded may be reinserted in the place of the v/arp thread 3b, 3e and 3g, respectively.
  • Such an embodiment requires that at least a first and a third warp thread lying adjacent a second warp thread of the same alternative binding, i.e. at least two of three consecutive warp thread ends according to the weaving repeat bind between alternatively above or below the threads at the outermost pair of weft threads of zone 5.
  • the warp thread lying between is thereby carried to a pick-up point in connection to the said outermost pair of weft threads.

Landscapes

  • Woven Fabrics (AREA)
  • Paper (AREA)
  • Looms (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

Procede pour former un rang de boucles a chaque extremite d'un tissu formant texture, tel un filtre ou un tissu similaire, ledit tissu comprenant deux couches de fils de trame, ces fils etant disposes par paires sensiblement l'un au-dessus de l'autre et des fils de chaine reliant lesdites trames, dans lequel les fils de trame sont enleves de facon permanente dans une premiere zone (4) situe plus pres d'un bord extreme dudit tissu et enleves de facon temporaire dans une seconde zone (5) adjacente a la premiere zone, dans lequel un certain nombre de fils de trame correspondant aux fils de trame enleves temporairement, avec au moins un fil de pliage (7, 8), sont tires comme une chaine dans une machine similaire a un metier a tisser, et dans lequel l'un desdits fils de pliage (8) est epais et remplace temporairement le cordon qui doit finalement relier les deux extremites du tissu. Le procede comprend differentes variantes selon la position des fils de chaine conformement au schema de tissage lorsqu'ils croisent les fils de trame appartenant a la partie situe le plus a l'exterieur et precedant la boucle elle-meme.
PCT/SE1978/000006 1977-07-05 1978-06-22 Procede pour former une jonction dans un tissu a deux couches WO1979000026A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR7808666A BR7808666A (pt) 1977-07-05 1978-06-22 Processo de provimento de uma fileira de lacadas em cada ponta de um tecido de formacao,de um pano de filtro,ou de um tecido semelhante
DE19782856951 DE2856951A1 (de) 1977-07-05 1978-06-22 A method of producing a seam in double-layer forming fabrics

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE7707787 1977-07-05
SE7707787A SE406608B (sv) 1977-07-05 1977-07-05 Forfarande for astadkommande av en skarv pa dubbellagrade formeringsviror
SE7807034A SE422478B (sv) 1977-07-05 1978-06-20 Forfarande for astadkommande av en skarv pa dubbellagrade formeringsviror

Publications (1)

Publication Number Publication Date
WO1979000026A1 true WO1979000026A1 (fr) 1979-01-25

Family

ID=26656835

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1978/000006 WO1979000026A1 (fr) 1977-07-05 1978-06-22 Procede pour former une jonction dans un tissu a deux couches

Country Status (10)

Country Link
EP (1) EP0006866A1 (fr)
JP (1) JPS5438980A (fr)
AU (1) AU521640B2 (fr)
CA (1) CA1093940A (fr)
FI (1) FI59838C (fr)
FR (1) FR2450299A1 (fr)
GB (1) GB2035890B (fr)
MX (1) MX148934A (fr)
NZ (1) NZ187738A (fr)
WO (1) WO1979000026A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4267226A (en) * 1979-09-19 1981-05-12 Wurttembergische Filztuchfabrik Fabric web and a method of making a fabric web for a dewatering machine
US4401137A (en) * 1978-11-30 1983-08-30 Albany International Corp. Forming fabric seam and method of producing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE310869B (fr) * 1966-08-29 1969-05-12 Rosenfors Bruk Ab
SE322980B (fr) * 1968-07-08 1970-04-20 Nordiska Maskinfilt Ab

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE310869B (fr) * 1966-08-29 1969-05-12 Rosenfors Bruk Ab
SE322980B (fr) * 1968-07-08 1970-04-20 Nordiska Maskinfilt Ab

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401137A (en) * 1978-11-30 1983-08-30 Albany International Corp. Forming fabric seam and method of producing
US4267226A (en) * 1979-09-19 1981-05-12 Wurttembergische Filztuchfabrik Fabric web and a method of making a fabric web for a dewatering machine

Also Published As

Publication number Publication date
CA1093940A (fr) 1981-01-20
FR2450299B1 (fr) 1983-10-07
EP0006866A1 (fr) 1980-01-23
FI782024A (fi) 1979-01-06
JPS5438980A (en) 1979-03-24
GB2035890B (en) 1982-04-28
FI59838C (fi) 1988-05-04
MX148934A (es) 1983-07-14
FR2450299A1 (fr) 1980-09-26
FI59838B (fi) 1981-06-30
AU521640B2 (en) 1982-04-22
AU3778278A (en) 1980-01-10
GB2035890A (en) 1980-06-25
NZ187738A (en) 1981-11-19

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