FI59633B - FORMERINGSVIRA FOER PAPPERS- CELLULOSA- ELLER LIKNANDE MASKINER OCH FOERFARANDE FOER FRAMSTAELLNING AV VIRAN - Google Patents

Description

[V * £ r '| [B] {11) ANNOUNCEMENT 59537 JWTA 1J UTLÄGGNINGSSKRIFT ° ° ° ° (45) ^ ^ ^ (51) Kv.ik.3 / int.ci.3 D 21 F 1/10 FINLAND I —FI N LAND (H) Pat «nttlh * k« mui - Pitcntanseknlng ^ + 5/73 (22) Haktmiipllvi - Ans6knlngad * g 0 8.01.7 3 (23) Alkupttvi —Glltlghatsdaf 08.01.73 (41) Become Public - Bllvlt offwitllg 02.03. 7I +

National Board of Patents and Registration .... M .. „.... . ,,,. .

_, (44) Date of publication and date of publication.—

Patent- och registerstyrelsen 'Anaökan utlagd och utl.tkrlft * n publk.nd 29-05.8l (32) (33) (31) Requested privilege —Begird prlorltet 01.09.72

Sweden-Sverige (SE) 113 ^ 7/72 (71) Nordiska Maskinfilt Aktiebolaget, S-301 03 Halmstad, Sweden-Sverige (SE) (72) Francisco Lorente Codorniu, Halmstad, Sweden-Sverige (SE) (7 * 4) Leitzinger Oy (5 * +) Styling wire for paper, cellulose and such machines and method of its manufacture - Formeringsvira för pappers-, Cellulosa-eller liknande Maskiner och förfarande för framställning av viran

In paper, cellulose and the like, single-layer wires woven from a metal wire or a synthetic fiber yarn made of a monofilament or multifilament are used to form a sheet. Due to their low wear resistance, metal wires have recently been frequently replaced by synthetic fiber wire wires, so-called plastic wires. Until now, these plastic wires have been made almost exclusively in a single layer, which, however, has had the disadvantage that they have been considerably more stretchable compared to a metal wire of similar fineness. For this reason, the use of plastic wires for a long time has been limited to the coarser part of wire grades and to narrow and slow-running paper machines. Although there have been major improvements in recent years, single-ply plastic fabrics for wide and fast newspaper and so-called paper looms, for example, have achieved little success. Several experiments have also failed with wide lining, power and sack paper machines - despite the use of coarse and therefore more standard plastic fabrics.

Nk. The two-ply plastic wires, which have two layers of yarn system and a second yarn system connecting the layers, have achieved completely different conditions for success with all types of paper machines due to their better durability. This has also been demonstrated in the literature during numerous trial runs. Among other things, the double-layer wire has been in use in a wide lining paper machine for 6 months compared to 8-10 days with a metal wire. Until now, the problem with this type of double-ply fabric has been that it has marked the paper web to a greater extent than the single-ply fabrics. The reason for this increased marking is that both parallel layers of weft yarns, and especially when the layer closest to the surface of the material to be shaped, must be straight and flat inside the wire, while the warp yarns are wavy and flank both outer surfaces. In similar cases, with a single-layer cloth, the error can be corrected by arranging the warp yarns under such a load that their corrugation is straightened while the weft yarns become corrugated. At a given threshold, the peaks of the waves flank the common plane. If a single ply wire is attached to this position, then the web in the shape of the sheet will rest against both wire systems and the risk of marks will be reduced.

The geometric structure of the two-layer wire arranged so far has made a similar operation impossible, but on the contrary, the straightening of the warp yarns has led to the weft yarns penetrating deeper towards the center of the wire.

The present invention relates to a forming wire for paper, cellulose and such machines, which wire consists of a layer of two synthetic weft yarns and synthetic warp yarns connecting the layers.

The invention is characterized in that each warp yarn, in addition to joining the two weft layers, also connects separately to the layer of weft yarns (cover layer) which is in use against the material to be formed, and that this warp yarn layer and the warp yarns connecting the layers substantially flank the wire against said material. (out) level. In this separate weaving, the warp yarns - which may be double-stranded - are partially joined together only with the above-mentioned layer of weft yarns, and then tension in these yarns - either by ordinary warp tension during the actual weaving or by separate finished fabric tension - causes increased waviness with said weft yarns. in the direction of the surface plane of the fabric, while the corrugated warp yarns are straightened. At a certain position, both said weft yarn layers and the layers connecting the warp yarns are flush with the same plane, which is also the outer plane of the wire.

The invention will now be described with reference to the accompanying schematic drawings, in which Figure 1 shows an example of a cross-section of a conventional two-layer forming wire and Figure 2 also an example of a cross-section of a two-layer but unstretched wire according to the invention, while Figures 3 to 6 show similar sections. Figure 7 shows an enlarged portion of the topmost layer of the wire of Figure 2 after stretching.

An ordinary two-layer forming wire, such as two-layer press and dryer wires, consists of two layers 1, 2 of weft yarns - the second layer 1 being on the side of the material to be shaped - and warp yarns 3, 4 and 5 connecting the two layers. , where the wires are mainly on top of each other. The first warp yarns (Figure 1) bind over the first two pairs, between the third pair and below the fourth and fifth pairs, and the sixth. between the pair before the pattern is repeated. The warp yarns H, 5 shown bind in the same way, but in the second order and in addition the pattern further includes three warp yarns not shown, before the passage of the first warp yarn 3 is repeated. A bond that can be shown to bind over and under two pairs of weft yarns has many variations in which each warp yarn can bind over or under one or more pairs of weft yarns. The two-layer forming wire model shown in Fig. 1 has a weft layer of straight yarns located in a plane 6 inside the wire while the warp yarns are corrugated and flank both of its outer planes 7 and 8. The geometric structure of the wire is such that any warp yarns are stretched. 4 and 5 during weaving or separately after weaving, then the weft layer 1 cannot take the same level as the warp yarns 3, ä and 5.

If, instead, according to Fig. 2, the warp yarns not only connect the two weft layers, but also bind separately to the layer of weft yarns which, in use, is on the side of the material to be shaped, then the wire according to the invention is obtained. The structure consists continuously of two layers of weft yarns 11, 12, the second layer 11 4 59633 being on the side of the material to be shaped, and the warp yarns connecting the layers, of which only one 13 is shown in Fig. 2. The warp yarn shown is woven between, over the second pair, between the third pair, over the fourth pair, between the fifth pair, under the sixth and seventh pairs, before the run repeats. In addition, the structure shown has six other warp yarns not shown before the warp yarn 13 runs again. The warp yarn 13 connects together with said six other warp yarns two layers of weft yarns 11, 12, but in addition each warp yarn also binds separately the weft yarns of the layer which, in use, is on the side of the material to be molded. Figure 2 shows this weaving of the warp yarn 13 between the first and fifth pairs of weft yarns 11, 12. This separate bonding provides stretching of the warp yarn 13 to the weft yarn 11 'in such a way that it is raised and lateral to the same plane 14 (Fig. 7) as the warp yarn 13, which also forms the outer surface of the wire. warp yarn in the pattern port in connection with each of the six intervening weft yarns 11 Figure 2 shows the position of the yarns 11, 12, 13 before stretching, but in fact is only the structure considered, because already during weaving, by warp tension, have taken the position shown in Figure 7.

The structure shown and explained - in which the separate bonding between the warp yarns 13 and the upper layer of the weft yarns 11 is double-stemmed - is to be considered only as an example, and thus this double-stitching length can vary and can be changed to another pattern, e.g. Some such models are shown in Figures 3-6.

According to Figure 3, the warp yarn is woven between the first pair of weft yarns 11, 12, over the second pair, between the third pair, over the fourth pair, between the fifth pair, over the sixth pair, between the standing pair and under the eighth pair and the ninth pair before the binding is repeated.

According to Figure 4, the warp yarn is woven between the first pair of weft yarns 11, 12, over the second pair, between the third and fourth pairs, over the fifth pair, between the sixth pair and under the seventh and eighth pairs before the binding is tightened.

5,59633

According to Figure 5, the warp yarn is woven between the first pair of weft yarns 11, 12, over the second pair, between the third pair, over the fourth pair, between the fifth pair, over the sixth pair, between the seventh pair and under the eighth, ninth and tenth pairs before the binding is repeated.

Finally, as shown in Fig. 6, the warp yarn is woven between the first pair of weft yarns 11, 12, over the second pair, between the third pair, over the fourth pair, between the fifth pair and under the sixth, seventh and eighth pairs before the binding is repeated.

Claims (7)

59633 A forming wire for paper, cellulose and such machines, which wire consists of a layer of two synthetic weft yarns (11, 12) and synthetic warp yarns (13) connecting the layers, characterized in that each warp yarn (13) in addition to joining both weft layers are also connected separately to the layer (top layer) of weft yarns (11) which is in use against the material to be formed, and that this warp yarns connecting the weft yarn layer and the layers are substantially adjacent to the (outer) plane (14) of the wire against said material. A method of making a forming wire according to claim 1, which wire consists of two synthetic layers of weft yarns (11, 12 and synthetic warp yarns (13) connecting the layers), characterized in that each warp yarn (13) not only connects both weft layers but is joined together. separately with the layer (cover layer) of the weft yarns (11) in use against the material to be formed, in addition to which the warp yarns are tightened and the wire heat-sealed so that the weft yarns and the warp yarns connecting the weft yarn layers substantially flank the wire against said material (outer) ( 14). A method according to claim 2, characterized in that both layers of weft yarns (11, 12) are made to form a pair in which the yarns substantially overlap and in which each warp yarn binds in order between a pair of weft yarns (11), over another pair, between a third pair, a fourth over the pair, between the fifth pair, and under the sixth and seventh pairs before the run repeats (Fig. 2). A method according to claim 2, characterized in that the two layers of weft yarns (11, 12) form a pair in which the yarns substantially overlap and in which each warp yarn (13) binds in order between the first pair of weft yarns, over the second pair, between the third pair, between the fourth pair. over a pair, between a fifth pair, over a sixth pair, between a seventh pair, and under an eighth and ninth pair before the run is repeated (Fig. 3). 7 59633 A method according to claim 2, characterized in that the two layers of weft yarns (11, 12) form a pair in which the yarns substantially overlap and in which each warp yarn (13) binds between the first pair of weft yarns, over the second pair, between the third and fourth pairs , over the fifth pair, between the sixth pair, and under the seventh and eighth pairs before the run is repeated (Fig. 4). A method according to claim 2, characterized in that the two layers of weft yarns (11, 12) form a pair in which the yarns substantially overlap and in which each warp yarn (13) is bound in sequence between the first pair of weft yarns, over the second pair, between the third pair, between the fourth over a pair, between a fifth pair, over a sixth pair, between a seventh pair, and under an eighth, ninth, and tenth pair before the run repeats (Figure 5). A method according to claim 2, characterized in that the two layers of weft yarns (11, 12) form a pair in which the yarns substantially overlap and in which each warp yarn (13) binds in sequence between the first pair of weft yarns, over the second pair, between the third pair, between the fourth over the pair, between the fifth pair, and under the sixth, seventh, and eighth pairs before the run repeats (Fig. 6). 59633