RU1836506C - Press needle-punched woollen cloth used for dewatering of cellulose mass in paper making machine - Google Patents

Abstract

The crosslinked press for dewatering the pulp in a paper machine consists of a multilayer fabric having a base and weft threads. To improve the dewatering ability of the presscloth and facilitate assembly, the dewatering side of the presscloth includes low number weft yarns (3), whose weight per unit length is twice the weight of the remaining weft yarns 1 and 2 layers. The seam, which may be open, is transverse to the direction of movement of the cloth in the paper machine. 2 s.p. f-ly, 3 ill.

Description

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The invention relates to a crosslinked press for dewatering pulp in a paper machine, which consists of a multilayer backing. having longitudinal and transverse threads.

The aim of the invention is to expand this problem, as a result of which it is not necessary to narrow the press cloth. To direct it through the small holes in the machine. The features of the present invention are described in the appended claims.

In FIG. 1 shows a part of a cross-section of a finished press cloth, wherein the direction of movement through a paper machine extends across the plane of the drawing; in FIG. 2 is a schematic cross-sectional view of a fabric in a weaving machine; in Fig.3 - a group of loops with a locking wire in assembled form, plan.

Thus, in FIG. Figure 1 shows a fabric consisting of two layers of yarns 1 and 2, serving as weaves in the weaving process. The thicker yarn 3 is woven on the side of the fabric that forms the dewatering side. The yarns 3 have a weight per unit length that is at least twice the weight of yarns 1 and 2. The thicker yarn 3 forms an upper layer that attaches. it has the desired bulge in the pulp. In the present construction, the bending of yarn 3 is carried out in accordance with path 4, i.e. 2/2 twill knocked down in double weave. As is known, in the process of weaving, along the one of the turning edges, pet00 Сл are formed)

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5 with weft threads 1 and 2. Loops 5 are formed around the hem of the main threads 6. The loops are used to form a seam that can be open.

In FIG. 2 schematically shows a cross section of the so-called tubular fabric. Here, loops 5 are formed by threads 1 and 2 around the edge main thread 6. Thicker threads, 3 have no loops. In addition, it should be emphasized that in FIG. 2, no interlacing with the main yarn is shown. Thus, when the tubular fabric is used as a press cloth, the threads 3 are cut near the loops and along a line parallel to the loops or the hem of the main thread 6. When later the hem end is pulled out, the cloth can be straightened along its entire length. this cloth may be provided with a layer of cotton which is sewn to it and gives it better rigidity. A reinforcing shelf of cotton is formed above the hinge location, and thus above the seam that can be opened (see Swedish Patent No. 447140). From Swedish Patent Ms 429982 is essentially known as making such a seam.

When the filament warp yarns are removed, the cloth can be introduced into the press press and after it is inserted, both ends of the cloth are connected by introducing the blocking wire 7 into loops 5. Thus, the cloth takes on a tubular shape, as shown in Fig. 3.

Yarns 1 and 2, which are weft yarns but are arranged longitudinally when used in a paper machine, are preferably single-fiber polyamide or polymer yarns having the same properties and a diameter of 0.3-0.7 mm, corresponding text N ° 80-430. Yarn 3 is either a single fiber yarn, or a twisted single fiber yarn or multi-fiber yarn having a unit weight that is at least two times the weight of yarns 1 and 2, thus at least 160

tex. Preferably, twisted thin monofilament or multi-fiber yarns are used. The main yarn or weave 4 is a simple single-fiber or twisted fine single-fiber yarn.

Claims (2)

1. A crosslinked press for dewatering pulp in a dryer, made in the form of a multilayer fabric, one of the layers of which contains weft yarns of a larger diameter, the linear density of which is at least two times the linear density of the weft threads of a smaller diameter of the other layers, while the weft threads of a larger diameter are intertwined with the main threads of other layers, characterized in that, for the purpose of to increase the efficiency of the dehydration process, a layer with weft threads of a larger diameter forms the dewatering, paper side of the fabric, and the fabric in the edge zone has loops of weft threads smaller diameter, protruding behind the main threads for placement in the loops when installing the locking wire on the machine and the formation of a split seam located transverse to the movement of the cloth in a machine, wherein the weft yarns of a larger diameter have a shorter length than the weft yarns of a smaller diameter to remove from the loops in the area formed by the weft yarns of a smaller diameter. 2. Cloth according to claim 1, with the proviso that the linear density of the strands of smaller diameter is 80-430 tex, and the linear density of the strands of larger diameter is at least 160 tex. h. Cloth according to claim 1, characterized in that to increase the stiffness of the cloth, the cloth further has a cotton layer consisting of fibers attached to the dewatering side of the fabric with sewing, while the layer of cotton is cut across to the cloth along the line of the locking wire. . 2 fa 3.2 TtvM, v v.  -: .-- .; - -; -: - -; -; -: -: -.; - -: -; - - Щттттттттттшштт - ::::::::::::: ::::::::::: - ::::::: ::: - :::::; ::::. :::: ::::::: :::::::: 1.: ".; .- hg.kh.:. At.; .- /. X.;.:.:. 1 /.:. At.;.;. L; /.;.: ..;; .;.:.:.:.: y ./.:.;/: x. ;; :: 1 .., ... rt    fjJJ fJj K-K-: -j: -; -7JK- vV ::; ::::::::: J v -r; -TT-:. :::::::; ::::;: ..: a;.: y ::::: ..:. ::::: - Xv.:-; -: -: -; -; -;.; ::: -; TtvM, v v .... Гч .J ... Чч1 .., FIG. 3