FI59838B - FOERFARANDE FOER ATT AOSTADKOMMA OEGLERADER PAO DUBBELLAGRADE FORMERINGSVIROR - Google Patents

Description

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FINLAND-FINLAND (*) Pattnttlhakcmui - PatcnMniOkning 78202 U

(22) H * k * mi * p4lvl - Ansöknlngsdag 26.06.78 * '(23) AlkupSIvi — Glltlghctsdag 26.06.78 (41) Tullut | ulki> «kil - Bllvlt offentilg 06. 01.79

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O ', (44) Date of issue and date of issue. - - n

Patent and registration authorities of the United Kingdom of Great Britain and Northern Ireland published 30.06.81 (32) (33) (31) Requested «tuolkeui — Begird prloritet 05-07.77 20.06.78 Sweden-Sweden (SE) 7707787-3, 780703 ^ -9 (71) ) Nordiskafilt AB, Gamletullsgatan 3, S-302 Halmstad, Sweden-Sverige (SE) (72) Ingvald Strandly, Oslo, Norway-Norge (NO) (7 * 0 Leitzinger Oy (5 * 0 Method for forming rows of loops in two-layer forming wires - For the purposes of this Regulation, the former Member State shall be responsible

Most coatings or wires in the paper, pulp and asbestos cement industries are endless. Usually the coverings are finished without end already when weaving with the so-called circular weaving technique or also by joining the ends of the fabric together during manufacture, for example by threading. Threading is usually performed by the manufacturer during the manufacture of the product. Due to the design of the machine, certain covers can be joined together when installed in the machine, and in these cases the cover must be equipped with a suitable locking device. Interconnection in the immediate vicinity of the installation is most common for drying blankets and drying cloths. A so-called belt buckle is often used for these product types. The loops or rings in these belt buckles are metal and usually U-shaped. They are attached either directly to the cover or to a special locking band which is knitted onto the ends of the cover.

However, in addition to the drying section, there are several other items where the coating must be delivered as an open structure to be attached directly to the machine. For example, it is common in inverter machines that the base wire is not allowed to be installed indefinitely. Because the belt buckle cannot be used to join forming wires or certain types of filters, several alternatives to 2,59838 belt buckles have been developed in recent years. In practice, the most useful is the so-called loop lock, in which the ends of the warp yarn are released and then pulled back into the fabric, after which they form lock loops at the end of the fabric. The locking loops at both ends are then connected during installation by one or more locking wires. Such a joint applied to a single-layer structure is disclosed, for example, in the Swedish publication 322 980.

In forming wires, it is important that the openness of the splice area is approximately the same as that of the rest of the wire in order to avoid too strong marking and to reduce the risk of the web breaking. It is also important that the locking loops be formed in such a way that they or the associated warp yarn are not subjected to abrasion to a greater extent than the rest of the wire.

In recent years, double-layer forming wires with two layers of weft yarns and warp yarns connecting these layers have become increasingly used. Examples of such forming wires are given in Swedish publications 366 353 and 385 486. In the past, attempts have also been made to provide wire types according to these publications with loop locks in order to make them useful in applications where the wire has to be connected directly to a machine. However, these two-layer wires cannot be provided with locking loops in a natural way due to e.g. their asymmetrical patterns. When the warp yarns have to be pulled back into the fabric after the loops have been formed, this must be done in such a way that the yarn is corrugated to the pattern of the wire, which has resulted in several loops becoming too small or too large, with openings in the locking yarn and other between the wire, causing stronger marking and also the risk of breaking the web. Another disadvantage has been that the warp yarn immediately associated with the formation of the loop has entered the wear side of the wire, which has resulted in its heavy wear.

The present invention relates to a method of forming rows of loops in a forming wire, filter cloth or the like consisting of two layers of weft yarns which are substantially superimposed in pairs, and warp yarns connecting the two layers, which rows of loops are arranged to be connected to each other by interlocking yarn.

The invention is characterized in that in the first zone the weft yarns closest to the second end edge of the fabric are permanently removed, that in the subsequent second zone the weft yarns are temporarily removed, a sewing machine in which a coarser yarn temporarily replaces the locking yarn which finally connects both ends of the fabric, that when two successive warp yarn ends according to the pattern bind between the outer pair of yarns in said second zone of weft yarns, one of these warp yarn ends is weft yarns, pulled in a loop around both the thin or thin and coarser tuft yarn that may be present and then back into the other n warp yarn to a receiving point in the second zone of weft yarns, where both warp yarns meet that when at least two of the three successive warp yarn ends in the pattern bind between the outer pair of yarns in the second zone of weft yarns, one of these warp yarn ends is to the second zone of weft yarns, pulled in a loop around any thin or thin and coarser bending yarn that may be present and then back to another warp yarn location at the receiving point in the second zone of weft yarns where both warp yarns meet, and the third warp yarn after weaving to the second zone shall be drawn at the receiving point immediately associated with the outermost pair of weft yarns in the second zone so that when two consecutive warp yarn ends binds over and / or below the yarns of the outer pair of weft yarns in the second zone of weft yarns, one of these warp yarn ends, after being woven into said second zone of weft yarns as shown in the figure, is drawn around said outer pair and thin or thin bending yarns and back to the location of the second warp yarn at a receiving point in the second zone of weft yarns, where both warp yarns meet that when at least two of the three consecutive warp yarn ends bind over and / or below the outer pair of yarns in the second zone of weft yarns, one of these warp yarns is woven into the second zone of weft yarns as shown, drawn around the outer jbar and the thin or thin bending yarns and then back into place of the second warp yarn at a receiving point in the second zone of weft yarns, at which point both warp yarns meet, while the third warp yarn head, after being woven into the second zone of weft yarns as shown, is drawn to a receiving point directly adjacent to the outermost pair of weft yarns, so that when one warp yarn yarn binds alternately to the outermost pair of weft yarns in the second zone above or below without being followed by a similarly alternating warp yarn head, this warp yarn head, after being woven into the second zone of weft yarns as shown, is drawn around the outer pair and any thin or thin bending yarns at a receiving point directly adjacent to the outer pair of weft yarns, and the warp yarn ends on each side of the fabric are treated in the same way and preferably simultaneously, the coarser bending yarn being common to the warp yarn ends on both edges of the fabric.

All the loops in the rows of loops to be connected by the locking yarn are formed when the warp yarns are bonded between the weft yarns in the outermost pair preceding the locking loop itself, as shown. In this case, the warp yarn joins the locking loop protected against wear. This method also makes the thickness of the locking loop itself smaller than that of the rest of the wire, which also saves the locking loop itself from wear, placing one or more thin yarns in only one layer between the two-layer wire and the rough bending wire, if necessary, reducing the openness of this part of the seam. decreases. At the same time, these additional yarns do not enlarge the loops in any way because they are arranged in one layer between the weft yarns of both layers.

In the following, the invention will be clarified with reference to the accompanying schematic drawings, in which the invention is contemplated as applying to a seven-layer double-layer forming wire in which each warp yarn is drawn in sequence and alternately over a second pair of weft yarns, under a third pair, over a pair of seventh and fifth pairs, before the operation is repeated.

Figure 1 shows the pattern of the wire in question.

Figures 2a, 2b, 2c, 2d show four different steps for providing a snap ring.

Figures 3-6 show a method for arranging all the yarns in the wire pattern used.

In Figure 1, the horizontal rows 1 and 2 show the weft yarns of the fabric and the vertical rows 3 the warp yarns of the fabric. The cross-yarns 1 form the upper layer of weft yarns and the cross-yarns 2 the lower layer. The full screen shows that the warp yarn crosses the corresponding weft yarn above the weft yarn. ' In this case, the warp yarn 3a passes - over the first weft yarn pair 1a and 2a - between the second weft yarn pair Ib and 2b - between the third weft yarn pair le and 2c - between the fourth weft yarn pair Id and 2d - between the fifth weft yarn pair le and 2e - over the sixth weft yarn pair lf and 2f and 2g before the cycle is repeated.

Fig. 2a shows a warp yarn 3a permanently released from the weft yarns in the first zone 4 in the right-hand side of Fig. 6 59838. In the following second zone 5, the weft yarns are temporarily removed, and a corresponding number of yarns are then placed as warps in a known sewing machine resembling a weaving tree (not shown). The left figure shows the wire part 6, which is located on the side of the seam area itself. In addition, a thin additional bending thread 7 and a coarser bending thread 8 are arranged in the sewing machine. In Fig. 2a, the tension of the first warp yarn 3a is formed so that the weft yarns 11b, 11c, 12c, lld, lie, lgg and the bending yarns 7 and 8 , 12b, 12d, 11f, 12f and 12g form a downstream. After the warp yarn 3a is inserted, the tongue is closed as shown in Fig. 2b. In Fig. 2c, the following tension is formed, which is identical to the tension of the warp yarn 3b of Fig. 1. The warp yarn 3a is wound around the bending yarns 7 and 8 and pulled back through a part of the zone 5 to the receiving point between the yarns 11a and 11c. The warp yarn 3b is arranged to pass in the same reception point. Figure 2d is a sentiment from the other side closed. The warp yarn 3a has formed a lock loop around the bending yarns 7 and 8. In the left part of Fig. 3, the warp yarn 3a is shown partly in its normal position and partly pulled back after it has been bent in place of the warp yarn 3b. Both successive warp yarns 3a and 3b bind between the yarns 11g and 12g in the outermost pair of zone 5. This can also be deduced from the pattern shape according to Fig. 1, in which the warp yarns 3a and 3b pass under the upper weft yarn Ig but over the lower weft yarn 2g.

In the pattern of Figure 1, the warp yarn 3c passes over the upper pair of weft yarns Ig and 2g in zone 5, but is followed by a warp yarn 3g which is attached between said pair of weft yarns. For this reason, the warp yarn 3a cannot form a locking loop, but as shown in Fig. 4 it is pulled around the thin bending yarn 7 at the receiving point between said bending yarn and the outer pair of weft yarns 11g and 12g.

According to the pattern shown in Fig. 1, the warp yarns 3d and 3e are both attached between the outermost pair of weft yarns Ig and 2g in the zone 5. One of these warp yarns, e.g. warp yarn 3d, is first woven into zone 5 as shown in Fig. 5 and then drawn in a ring or loop around both 7 59838 thin bending yarn 7 and coarser bending yarn 8 back to zone 5 at the location of the second warp yarn 3e (not shown) , where the warp yarn 3d meets the warp yarn 3e. The formed loop 9b, like the loop 9a formed by the warp yarn 3a, forms locking loops or rings for the final fastening of the wire.

As shown in Fig. 1, the warp yarn 3f and 3g are attached over and under the outermost pair of weft yarns Ig and 2g in zone 5, respectively. One of these warp yarns, e.g. warp yarn 3f, is first woven into zone 5 according to Fig. 6 and then a thin bend is drawn around the yarn 7 back to zone 5 in place of the second warp yarn 3g and further to a suitable receiving point (not shown) where the warp yarn 3f meets warp yarn 3g. In this case, no bending loop or ring is formed around the wire 8.

The second wire end (right side of Figures 3-6) operates in the same manner to form both locking loops 10a (Figure 4) and 10b (Figure 6). Before installation on the paper machine, the wire is opened by removing the bending wire 8, and after installation, the locking loops 9 and 10 are re-arranged, after which one or more locking wires pass through them.

The seam made in this way has both the warp threads associated with the locking loops and the locking loops themselves well protected against wear. The additional bending yarns held in place by the warp yarns that do not form locking loops can be adapted to fit the size of the locking loops, thereby reducing the openness to avoid strong marking and the risk of breakage.

The invention can be applied to several double-layered wires with different patterns, and the invention is particularly suitable for wires with an asymmetrical pattern, in which the warp yarn binds different weft yarns in both weft yarn layers.

In the embodiment shown, the binding pattern according to Figure 1 is adapted so that the warp yarns 3a, 3d and 3f can be retracted after being bent in place of the adjacent warp yarn 3b, 3e, 859838 3g. In other binding patterns, it may be more convenient to form a loop so that after bending, the warp yarn is not pulled back to the location of the nearest adjacent warp yarn, but then to the location of the next yarn, if this location is more suitable for the pattern. In such an embodiment, at least the first and adjacent warp yarns (i.e., the third warp yarn) having a similarly alternating bond must pass alternately over or under the yarns of the outer pair of weft yarns in zone 5, with at least two of the three successive warp yarn ends alternately . The warp yarn in the middle is then drawn to the receiving point and is directly connected to said outer pair of weft yarns.

Claims (2)

9,59838 A method of forming rows of loops in a forming wire, filter cloth fabric or the like, comprising two layers of weft yarns (1, 2, 11, 12) arranged substantially in pairs on top of each other and warp yarns (3) connecting the two layers, the rows of loops being arranged to be joined together by a locking yarn a-wool to form an endless web of fabric, characterized in that the weft yarns in the first zone (4) closest to the second end edge of the fabric are permanently removed, the weft yarns (11, 12) in the subsequent second zone (5) are temporarily removed, the temporarily removed or equivalent number of weft yarns and the coarser and possibly also one or more thin bending yarns (8 and 7) are retracted as warps into a fabric-like sewing machine known per se, in which the coarser yarn (8) temporarily replaces the locking yarn which finally connects both ends of the fabric, and when the two the next warp yarn end (3a, 3b) runs between the outermost pair of yarns (11g, 12g) in the second zone (5) of the weft yarns, one (3a) of these warp yarn ends after being woven into the second zone (5) of the weft yarns as shown. , is drawn in a loop around any thin or thin and coarser bending yarns (7 and 8) which may be present and then back to the second warp yarn (3b) at a receiving point in the second zone of weft yarns where both warp yarns (3a, 3b) meet that two of the three successive warp yarn ends (3) run as shown between the outermost pair of yarns in the second zone (5) of the weft yarns (11g, 12g), one of these warp yarn ends, after being woven into the second zone (5) of the weft yarns, being pulled in a loop both the thin or thin and coarser bending wire (7 and 8) and the like which may be present and then back to the location of one of the other warp yarns at the receiving point in the second zone (5) of weft yarns, where both warp yarns meet, while the third warp yarn, after being woven into the second zone (5) of warp yarns as shown, is drawn to a point directly connected to the outermost pair (llg, 12g) in the zone (5), 59838 ίο that when two successive warp yarn ends (3f, 3g) pass over a pair of outermost yarns (llg, 12g) in the second zone (5) of weft yarns as shown. and / or below, one (3f) of these warp yarn ends, after being woven into the second zone (5) of warp yarns as shown, is pulled around said outer pair (11g, 12g) and optionally thin or thin bending yarns (7) and then back in place of the second warp yarn (3g) at a receiving point in the second zone (5) of weft yarns, where both warp yarns at (3f, 3g) face each other that when at least two of the three successive warp yarn ends (3) pass over and / or below the outer yarn pair in the second zone of the weft yarns (11g, 12g) as shown, one of these warp yarns, after woven into the second zone (5) of weft yarns according to the figure, drawn around the outer pair (11g, 12g) and possibly thin or thin bending yarns (7) and then back to the second warp yarn in place at the receiving point in the second zone (5) of weft yarns, where the two warp yarns meet each other, while the third warp yarn end, after being woven according to the pattern into the second zone (5) of weft yarns, is drawn to a receiving point directly adjacent to the outermost pair of weft yarns (11g, 12g); alternately over the outer pair of yarns (llg, 12g) in the second zone (5) of weft yarns, or a without being followed in the same way by an alternating warp yarn head, this warp yarn head (3c), after being woven into the second zone of weft yarns (5) as shown, is pulled around the outer pair (11g, 12g) and possibly thin or thin bending yarns (7) to a receiving point directly adjacent to the outermost pair of weft yarns (11g, 12g), and that the warp yarn ends at both edges of the fabric are treated in the same manner and preferably simultaneously, with a coarser bending yarn (8) common to the warp yarn ends of both fabric ends. A method according to claim 1, characterized in that the rows of loops 11 59838 to be connected to each other are arranged on an asymmetrical patterning wire, filter cloth or similar fabric, wherein in the figure each warp yarn has more passages in the first layer of weft yarns than in the second layer. 12,59838