FI88529C - Steam lever Foer paper mask - Google Patents

Description

x 88529

Two-ply paper machine wire

The present invention relates to a two-ply paper-5 machine wire, and in particular to a two-ply wire made of plastic yarns with a 5-17-strand bond, in which the weft yarns are arranged in groups and the lower layer weft yarns have a larger diameter than the upper layer weft yarns. It is known that in connection with two-to-10-layer wires, two groups of weft yarns are tied to a group of warp yarns, in which case the corresponding individual yarns of these groups must be superimposed as much as possible. The disadvantage of this bonding method is that the diameter of the lower layer weft yarns is approximately the same or only slightly larger than that of the upper layer weft yarns, because otherwise sufficient deformation is not achieved during thermal bonding and the lower weft yarns extend too little over the warp yarns. As a result, when using constant abrasion volumes, this type of bonding is limited in nature.

In connection with this method of binding, there are still two narrow points in the free running space of the wire, whereby the dewatering! to-conditions deviate from the ideal arrangement.

It is an object of the present invention, on the one hand, to increase the 'abrasion volume of the lower layer and, on the other hand, to improve: the dewatering and retention of the wire. According to the prior art, the two weft yarns of the upper layer are always placed together with the larger diameter weft yarn of the lower layer. In this case, the diameter of the lower weft yarns may be 50-100% larger than the diameter of the upper weft yarns, which is approximately the same as that of the warp yarn.

: 35 The wire fabrics of the invention can be made with 5-17-var. The essential characteristic of these wires is. a characteristic feature is that the two weft yarns of the upper layer at a time are always matched with one weft yarn of the lower layer 2 88529, so that the weft yarn of the lower layer is located on the center line between the two weft yarns of the upper layer. The warp yarn then passes only once under the weft yarn of the lower layer according to the bonding pattern, the weft yarns being provided with long runs on the run side in order to maintain the necessary abrasion volume. On the upper surface of the wire, reinforcement in the direction of the warps or wefts can be made to achieve the necessary web-forming properties.

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The following is an example of possible structural modifications of a wire fabric with a 7-arm bond:

Figure 1 shows the possible course of the warp yarns 1 in general. The weft yarns of the upper layer are denoted by the number 2 and the weft yarns of the lower layer by the number 3. The fixed point is the yarn group 7, where the warp yarn 1 passes under the weft yarn 3 of the lower layer for binding. Furthermore, in the region of groups 1 to 6, these yarns can pass over or under the upper layer yarns 2, in accordance with essentially all modification possibilities. The preferred embodiment is one in which the warp yarns 1 pass over the weft yarns of the upper yarn set 2-5.

In this case, a single-level wire structure should be achieved, in which the upper parts of these yarns are in the same plane.

Example 1 In this example, the warp yarns 1 first pass over the three weft yarns 2 of the upper layer, then under three and finally over two.

Figure 2 shows the flow of the warp yarn;

Figure 3 shows a bonding scheme; and

Figure 4 shows a plan view on the paper side.

3? 8 5 2 9

It can be seen in Figure 4 that the support portion of the weft yarns is approximately the same as that of the warp yarns, which is a preferred application, above all for wire pattern sensitive papers. Such a wire fabric can be made by using 62 warp yarns / cm, 0.17 mm in diameter, and 40 weft yarns / cm, 0.17 mm in diameter in the upper layer, and 20 warp yarns / cm, 0.30 mm in diameter in the lower layer.

Example 2 10

Fig. 5 (warp yarn flow), Fig. 6 (binding pattern) and Fig. 7 (plan view on the paper side) show another embodiment in which the warp yarn 1 is passed to pass once over three weft yarns 2. In this case, a mainly transverse run of the yarns on the paper side is achieved, which above all enables good paper retention and removal. The number and diameter of the warp yarns are the same as in Example 1. The weft yarns are then 46 / cm and their diameters are 0.17 mm and 0.14 mm.

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Example 3

According to Fig. 8, the warp yarn 1 runs in this case! over the five weft yarns 2 of the upper layer. Figures 9 and 10 ./; 25 again show a binding pattern and a plan view on the paper side. This application web contains a stronger warp yarn run and is especially suitable for kraft papers. In this application example, the upper layer has 44 warp yarns / cm, a diameter of 0.23 mm and 30 weft yarns, a diameter of 0.23 to 30 mm, and the lower layer has 15 weft yarns, a diameter of 0.40 mm.

Claims (2)

4,38529 A two-ply paper machine fabric made of plastic yarns with a 5-17-strand bond, wherein the weft yarns are arranged in groups and the lower layer weft yarns have a larger diameter than the upper layer weft yarns, characterized in that the two weft yarns of the upper layer the yarn (2) at a time is always matched with one weft yarn (3) of the lower layer so that the weft yarn of the lower layer is located on the center line between the two weft yarns of the upper layer. Wire according to claim 1, characterized in that the upper layer weft yarns (2) passing above the warp yarns (1) of the same layer form two to five intersections with said warp yarns or that they run one to two and a half above the weft yarn group (2) without going below the weft yarns. . 20 l. (2) In the case of a sketch of 25 skins and anchors of a skewer (3) In the case of sketches, a sketch of a sketch of a sketch of a skewer is used. 2. Tväskiktsvira enligt patentkravet 1, kännetecknad av att väftträdarna (2) i det övre skiktet under sin Gäng ovan-för varpträdarna (1) i samma skikt bildar tvä account fem Kors-ningspunkter med nämnda varpträdar, eller de the account is och and not cheap (2) utan att 15 däremellan gä under väftträdarna.