FR2545514A1 - WOVEN BELT IN PARTICULAR FOR THE PAPER INDUSTRY - Google Patents

Abstract

1. A woven band with n weft planes, particularly conceived for paper manufacturing, comprising weft filaments (16) and warp filaments (1, 2, 3, 4, 5, 6, 7, 8), some of them serving to constitute loops (13) at the ends (12) of the band (11) and the zones (C) adjacent to the loops (13) having a thickness of m (m > 1) weft planes, characterized in that each zone (C) adjacent to the loops (13) comprises for each armure repeat of the warp filaments (1, 2, 3, 4, 5, 6, 7, 8) a first group (G1) of warp filaments (1, 2, 3, 4) forming a lower layer (20) of p weft planes and an upper layer (20') folded back on the lower layer (20) with (m-p) weft planes, and a second group (G2) of warp filaments (5, 7) forming a layer with m weft planes, some at least of the warp filaments (1, 2, 3, 4) of the first group (G1) serving to constitute loops (13).

Description

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  Woven tape especially for the paper industry.

  The present invention relates to a woven web with N weft planes intended in particular for the paper industry comprising weft threads and catenary threads, some of which serve to form at the ends of the band loops and whose zones

  neighboring loops have a thickness of m (m> 1) frame planes.

  To join the loops one can use a ring which is threaded in the interlaced loops or use spirals which are

  threaded in the loops and connected themselves by a ring.

  Such woven strips are used especially in the industry

  paper mill in particular as dryer fabric.

  The band is wrapped around the machine's drying cylinders

  to make the paper and then junction.

  It is known to form the neighboring C zone loops

  this area by taking the warp ends which reached the

  the place of the following warp threads that were interrupted before

  zone C Some of these warp yarns form loops at the end

the band.

  But these loops which are not in planes perpendicular to the frames have a congestion in the direction of the frames higher than

  the thickness of a thread Since these loops must be interlaced

  with the loops on the other end we can only have one

  25% density of loops at each end.

  The woven strip according to the invention making it possible to obtain a higher density of loops is characterized in that each zone adjacent to the

  loops for each armor ratio warp threads a pre-

  first group of warp yarns forming a lower layer of p planes

  frame and a top layer folded over the lower layer

  having (m p) weft planes and a second group of warp yarns forming a layer having m weft planes, at least some of

  chain son of the first group used to constitute loops.

  In the woven strip according to the invention, the loops obtained by the warp yarns of group G 1 are in planes perpendicular to the wefts and are therefore much less bulky. The density of these loops can therefore be increased and consequently the strength of the junction.

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  According to one embodiment of the invention, the neighboring zone of the loops is thicker than the rest of the strip (m> n), which makes it possible to use loops of a height greater than the thickness of the strip, but obviously without exceeding the thickness of the neighboring zone of the loops in order to avoid the marking of the paper by the loops and

the abrasion of the loops.

  According to one embodiment of the invention, the neighboring zone of the loops has the same thickness as the rest of the band, which avoids the marking of the

paper by the extra thicknesses.

  The invention will now be described in more detail by referring to

  particular embodiments cited as a non-standard example.

  restrictive and represented by appended drawings.

  Figure 1 shows a woven strip of the known type.

  FIG. 2 represents an end of a woven strip according to

the invention with extra thickness.

  FIG. 3 represents an end of a woven strip according to

the invention without extra thickness.

  The woven strip 11 shown in FIG.

  mites 12 provided with loops 130 When the loops 13 are interlaced one

  can introduce a ring 14 to join the band.

  Each loop 13 is constituted by a warp thread 15 which when reweaving with the weft threads 16 has taken the place of the warp thread.

  neighbor 17 interrupted at a distance from the end 12.

  FIG. 2 shows the end of the strip according to

the invention.

  The strip comprises two weft planes (a, b) The weft threads 16 are represented by dots The end of the strip is cut into four zones in the order A, B, C, D, the zone D comprising loops i 3

  and zone A the unmodified band.

  Each armor ratio of the warp yarns in zones B and C comprises a first group G1 consisting of four warp threads 1, 2, 3,

  4 and a second group G 2 consisting of four warp threads 5, 6, 7, 8.

  The total thickness of zone C is three weft planes a, b, c

(m = 3).

  The evolution of the sons of the first group Gi is figured in the first

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  plane and that of the second group G 2 in the background.

  The warp threads 1, 2, 3, 4 work on two planes (p = 2) of weft a, b in the zones A and B and also in the zone C where they form the lower layer 20 The warp yarns 1, 2, 3, 4 pass under a weft yarn of the plane a then on a weft yarn of the plane b located two intervals farther and then under a weft yarn of the plane located two intervals further and so on. represents the

  band In the zone D the son 1 to 4 form four loops 13 adja-

  Centes. The wires 1, 2, 3, 4 form an upper layer 20 'folded on

  the lower layer 20 making extra thickness on the reverse side of the strip.

  The upper layer 20 'is located only in the zone C and the son 1, 2, 3, 4 work in a single plane c (mp = 1) Each warp 1, 2, 3, 4 passes successively over One weft yarn and below three weft yarns yarns 1 to 4 are interrupted towards the end of the zone C. The warp yarns 5, 6, 7, 8 work between the two planes a, b in the zone A In zone B the wires 6 and 8 are interrupted The wires and 7 work between two planes a, b in zone B and between three planes a, b, c in zone C. Arrived at the end of the zone C the son 5 and 7 were arranged during the reweaving by passing them instead of the son 6 and 8 up to the vicinity of the end of the son 6 and 8 o they are interrupted Thus in the area C each wire 5 and 7 goes under a wire of

  frame of the plane a, then on a weft yarn of the plane c located two inter-

  valles farther and so on to the end of the zone C Then returning each wire 5 and 7 passes on the weft son of the plane c and under the weft son of the plane a in a symmetrical path

  in plan b of the path followed on the way.

  To make the areas B, C, D can be used a splicing machine (machine to reweave the fabric perpendicular to its direction of

weaving of origin).

  In zone C wires 5 and 7 serve to connect the lower layer

  20 to the upper layer 20 '.

  For the group G 2 could alternatively use the four son, 6, 7, 8 to the end of the zone C adjacent to the zone D in

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  changing the four wires between the three planes a, b and c and cutting these four wires at the end of the zone C. Obviously if in zone C there were four weft planes we could add between zone B and the zone C a zone C 'with three frame planes similar to the zone C of the present FIG. 2 so that the

  variation of the thickness is not too abrupt.

  FIG. 3 shows a woven strip in which it

  there is no extra thickness in the neighboring zone C loops (m = n).

  The band (zone A) has two frame planes a, b (n = 2).

  In zone C, the wires of the group G 1, 2, 3, 4 form a lower layer 20 at a plane (p = 1) and an upper layer 20 'at a plane (mp = 1) with four loops 13 in the zone D. The son of group G 2, 6 and 8 are interrupted in zone B and son 5 and 7 constitute zone C These son 5 and 7 are rewound in

  taking the place of the son 6 and 8 as in the example of Figure 2.

  Figures 2 and 3 show only one end of the

  but it is clear that the other end consists of

  in a similar way so that areas with loops

  can best cooperate at the junction of the band.

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Claims (3)

  1 / woven web with N weft planes intended in particular for the paper industry having weft threads (16) and warp threads (1, 2, 3, 4,5, 6, 7, 8) some of which serve at the ends (12) of the band (11), loops (13) and whose adjacent zones (C) have loops (13) having a thickness of m (ml 1), which are characterized in that each zone (C) adjacent to the boueles (13) comprises for each ratio   armoring of the warp threads (1, 2, 3 4, 5, 6, 7, 8) a first group of   pe (G 1) of warp yarns (1, 2, 3, 4) forming a lower layer (20) of p weft planes and an upper layer (20 v) folded over the lower layer (20) having (mp) weft planes and a second group (G 2) of chane wires (5, 7) forming a layer having m weft planes, at least some of the chaff wires (1, 2, 3, 4) of the first group ( G 1) serving constitute loops (13).   2 / web woven according to ravendieation 1, characterized in that the area (C) adjacent loops (13) is thicker than the rest of the band (11) (m> n).   3 / Woven strip according to claim 1 caraetérisée in that the area (C) adjacent loops (13) to the same thickness as the rest of the band (11) (m = n).