FI78140C - Woven felt especially for use in 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

78140

This invention relates to a woven felt having n Kudeta soo for use in particular in the paper industry and comprising weft yarns and warp yarns, some of which are used at the ends of the felt to form loops. whose zones adjacent to the loops have m weft level strength (m> 1).

To connect the loops to each other, a pin can be used, which is threaded through the loops inserted into each other's gaps, or coil springs are used, which are first threaded into the loops and then connected with the pins.

Such woven blankets are used especially in the paper industry, especially as drying blankets.

The felt is passed around the drying cylinders of a paper machine and then its ends are joined together.

To form the zone C adjacent to the loops, it is known to weave this zone back again by giving the warp yarns which have reached the head of the felt the position of the other warp yarns in the group, which in turn are cut before zone C. Some of the warp yarns form loops at the felt end.

But these loops, which are not in planes perpendicular to the plane of the weft yarns, have the direction of the weft yarns. . greater space requirement than wire thickness. Given that the loops must be inserted into the loops of the loops at the other end of the felt, a loop density of only about 25% at each end can be used.

The woven felt according to the invention allows a higher loop density to be used and is characterized in that each zone adjacent to the loops comprises for each subwarp formed by the warp yarns a first group of warp yarns forming a lower layer comprising p weft plane and an upper layer comprising m - p weave plane , printed on the lower layer, and a second group of warp yarns forming a layer comprising m weft levels, wherein at least some of the warp yarns belonging to the first group form loops.

In the woven felt according to the invention, the loops formed from the warp yarns of the group G1 are in planes perpendicular to the weft yarns and take up considerably less space. Thus, the density of the loops can be increased and consequently the strength of the joint can be increased.

According to one embodiment of the invention, the zone adjacent to the loops is thicker than the actual felt (m> n), which makes it possible to use loops higher than the thickness of the actual felt, without, of course, exceeding the thickness of the adjacent loop, thus avoiding traces on the paper. .

According to another embodiment of the invention, the zone adjacent to the loops has the same thickness as the actual felt, which prevents the formation of marks on the paper due to bumps.

The invention will now be described in more detail in the light of certain embodiments by way of non-limiting example with reference to the accompanying drawings.

Figure 1 shows a woven felt of a known type. Figure 2 shows the end of a nonwoven felt according to the invention with excessive thickness.

Figure 3 shows the end of a woven felt according to the invention, where there is no excessive thickness.

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The woven felt 11 in Figure 1 comprises two felt ends 12 with loops 13. Once the loops 13 have been inserted into each other's gaps, the felt ends can be joined together by threading a rod 14 through the loops.

Each loop 13 consists of a warp yarn 15 which, when woven backwards with the weft yarns 16, takes the place of a warp yarn 17 which is cut at a certain distance from the end 12 of the felt.

Figure 2 shows a felt head according to the invention.

The blanket comprises two tissue levels (a, b). The weft yarns 16 are shown as dots. The end of the felt is divided into four zones A, B, C, D, where zone D comprises loops 13 and zone A the actual unmodified felt.

Each partial warp in zones B and C comprises a first group of warp yarns G1 with four warp yarns 1, 2, 3, 4 and a second group G2 with four warp yarns 5, 6, 7, 8.

The total thickness of zone C is three tissue levels a, b, c (m = 3).

The structure of the first group G1 is shown in the anterior plane, and that of the second group G2 in the posterior plane.

The warp yarns 1, 2, 3, 4 pass in two weft planes a, b in zones A and B (p - 2) and likewise in zone C, where they form the lower layer 20. The warp yarns 1, 2, 3, 4 pass under one weft yarn in plane a, then over one weft yarn in plane b at the end of two weft yarns and then below one weft yarn in plane a at the end of two gaps, etc. Zone A represents the actual felt. In zone D, the wires 1-4 form four adjacent loops 13.

4,78140

The yarns 1, 2, 3, 4 form an upper layer 20 ', which is printed on the lower layer 20, causing excessive thickness on the wrong side of the felt. The upper layer 20 'is located only in zone C, and the wires 1, 2, 3, 4 run in a single plane c (m - p = 1). Each of the warp yarns 1, 2, 3, 4 passes periodically first over one weft yarn and then under three weft yarns. Yarns 1 to 4 end at the end of zone C.

The warp yarns 5, 6, 7, 8 run between two planes a, b in zone A. In zone B, the yarns 6 and 8 are cut off. Yarns 5 and 7 run between two planes a, b in zone C.

The yarns 5 and 7 arriving at the end of the zone C are replaced by the yarns 6 and 8 in the re-weaving, extending there close to the end point of the yarns 6 and 8, where they are cut. Thus, in zone C, each yarn 5 and 7 passes under one weft yarn in plane a, then over one weft yarn in plane c at the end of two weft yarn spacing, etc., until the end of zone C. Upon reaching here, both yarns 5 and 7 return back above the weft yarns of plane c and below the weft yarns of plane a symmetrically with respect to plane b.

To make zones B, C, D, a weaver's machine (a machine that re-weaves the fabric perpendicular to the original weaving direction) must be used.

In zone C, the wires 5 and 7 are used to attach the lower layer 20 to the upper layer 20 '.

For group G2, an alternative could be to continue weaving the four yarns 5, 6, 7, 8 in three planes a, b, c until the end of zone C next to zone D, where they would be cut.

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It is obvious that if there were four weft levels in zone C, a zone C 'with three weft levels could be added between zones B and C, resembling zone C in Figure 2, so that the change in excess thickness is not too abrupt.

Figure 3 shows a woven felt with no excess thickness in zone C near the loops (m = n).

The felt (zone A) comprises two tissue levels a, b (n = 2).

In zone C, the wires 1, 2, 3, 4 of group G1 form the lower layer 20 in one plane (p = 1) and the upper layer 20 'in one plane (m - p = 1), where zone D has four loops 13.

The yarns 6 and 8 of group G2 are cut in zone B, and the yarns 5 and 7 form zone C. These yarns 5 and 7 are woven again in place of yarns 6 and 8, as in the example of Fig. 2.

Figures 2 and 3 show only one end of the felt, but it is clear that the other end is preferably formed in the same way so that the zones with loops are best suited for joining the ends of the felt.

Claims (3)

6,78140 1. A woven felt with n weft levels, intended specifically for use in the paper industry, comprising weft yarns (16) and warp yarns (1, 2, 3, 4, 5, 6, 7, 8), some of which are used at the ends of the felt ( 12) to form loops (13), the adjacent zones (C) of the loops (13) having m weft level strength (m> 1), characterized in that each zone (C) adjacent to the loops (13) comprises each of warp yarns (1, 2, 3, 4, 5, 6, 7, 8), a first group (G1) of warp yarns (1, 2, 3, 4) forming a lower layer (20) comprising p-weave and m-p a layer (20 ') printed on the lower layer (20) and a second group (G2) of warp yarns (5, 7) forming a layer comprising m weft planes, wherein at least some of the warp yarns (1, 2, 3) of the first group (G1) , 4) forming loops (13). Woven felt according to Claim 1, characterized in that the zone (C) next to the loops (13) is thicker than the rest of the felt (11) (m> n). Woven felt according to Claim 1, characterized in that the zone (C) next to the loops (13) is as thick as the rest of the felt (11) (m = n). In addition to the filter plan, the filter is specially designed for the paper industry and the filter filter is equipped with a filter (16) and a spindle (1, 2, 3, 4, 5, 6, 7, 8), in the case of filters (for the purpose of the image (13) and the color of the zone (C) and the color of the image (13)