DE1233240B - Sieve or the like woven from plastic threads. - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 07b

German class: 5Od-6/10

Number: 1233 240

File number: P 36884 VI a / 50 d

Filing date: May 25, 1965

Opened on: January 26, 1967

The invention relates to fabrics made of plastic threads such as sieves or the like. And especially on paper machine screens, which are composed of a fabric web to form an endless belt or screen are, the individual warp thread piles are distributed over a larger area.

It is known that plastic paper machine screens have greater abrasion resistance than metal screens own. It is the joining of the ends of a web-shaped woven screen into an endless screen by welding the abutting plastic threads not possible because of the strength achieved the joint would be too small. Glued overlapping joints are therefore not appropriate because they result the permeability of the screen is impaired.

To avoid these disadvantages, you have z. B. Circular looms of unusual dimensions for making endless sieves are used, so that connecting joints are not necessary. The required for this However, the effort involved is very great. That is why it has already been suggested that the shocks of each Distribute the warp threads over a larger area so that two thread ends are not directly next to each other lie. In these known designs, however, the warp thread stacks are relatively thick, so that an undesirable thickening of the screen in the connection area cannot be avoided. Do you want to avoid this thickening leading to increased wear is a middle layer of the weft threads between the overlapping warp thread ends required, which can only be achieved with thinner weft threads is. The production of a screen with weft threads of different thicknesses, however, is not economically feasible.

The object of the invention is to provide sieves or the like woven from plastic threads with butt joints high strength in the fabric without a noticeable thickening of the same and without the disadvantages to create the known sieves, but the permeability of the sieve is not or practical is not affected. According to the invention this is achieved in that the warp threads are independent of the weft threads remaining in their original position at their points pointing in the thread direction End faces are connected to each other. The individual thread connections are in a larger one Area widely distributed. This creates a flat joint, with practically no thickening of the warp thread ends of the sieve. Should two of the barely thickened joints be next to each other lie, there is an exit to the sides

Sieve or the like woven from plastic threads.

Applicant:

Dr. Plate G. m. B. H., Bonn, Dransdorfer Weg 21

Named as inventor:
Bernhard Domin, Bonn

Possibility to soften because the next connection points are further away.

The ends of the warp threads to be connected to one another are preferably cut obliquely and connected to one another glued. Since the individual connection points are not in a row, but over a large

ao ßere area are arranged distributed, impaired even a slightly thicker adhesive point, the permeability of the screen cannot be felt. In some use cases the warp thread connections can also alternate in pairs without scattering in one each Row should be attached to both ends of the planar joint. Here there is the possibility of that the two rows formed by the connections leave marks, but appear this only as a dotted line at the joint ends.

In the F i g. 1 to 4 of the drawing are excerpts from various embodiments of the invention Paper machine screens shown in plan view, from which various options for Connecting the warp threads to the endless sieve can be seen.

Each screen is woven in a known manner from warp threads A and weft threads B , which are made of plastic. The connection points C are highlighted in the drawing for greater clarity of the representation.

In Fig. 1 shows two rows of diagonally cut and glued warp thread connections C at the top and five rows at the bottom. Between rows 1 and 2 there is a gap of two undisturbed mesh pitches, while it is of different sizes between rows 3 to 7. The row groups 1, 2 and 3, 7 are eleven mesh divisions apart. The number of connection points is unevenly distributed across all rows.

F i g. 2 shows another example with four rows 1 to 4 of oblique warp thread connections C. Here lie

609 758/213

the rows of each row group also two stitches apart, the row groups 1, 2 and 3, 4, on the other hand, are thirteen stitches apart. The outer rows contain 1 and 4 the same number of connection points C, as well as the inner rows 2 and 3.

F i g. 3 shows a six-row connection, the two outer rows 1 and 6 having the same number of connection points C have like the four inner rows 2 to 5 together.

According to FIG. 4 there are only two rows of obliquely cut warp thread connections nineteen mesh pitches apart. The warp thread connections are alternating in pairs attached without scattering in a row 1 or 2 at both ends of the joint.

In all cases, the inventive idea is applied not to lay the connection points of the warp threads in a line, as in the case of welded metal wires, but over a field with at least one undisturbed area. To distribute mesh spacing, wherein 'the field extends over many weft threads. This avoids an accumulation of adhesive points and the permeability of the screen is almost the same everywhere. Due to the long overlap of the warp threads in the wide butt joint, the: adhesive points of the warp threads are also largely relieved of tensile forces, since the entire fabric or braid of the mesh field carries along with it. This is another great advantage of the large screen connection: '■; -: ■? 30th

Also by the fact that during the production of the screen connector the weft threads in this zone are neither replaced by new ones nor temporarily removed, the warp threads are inevitably exactly in the crank arcs of the weft threads, whereby neither the mesh structure nor the screen surface on ■■ _ the connection point of the screen can be changed.

In order to increase the durability of the sieve, the entire sieve is made after the warp threads have been glued coated with a plastic solution, in particular a polyurethane compound.

painter temperature, or harden with heat; Through this the crossing points of the threads are connected to one another, which increases the strength of the Sieve pile is increased and the shape of the mesh structure is preserved.

Claims (5)

Patent claims: 1. From plastic threads woven screen od. Like, in particular paper machine screen, which consists of a Fabric web is put together to form an endless sieve, with the individual warp thread piles are distributed over a larger area, characterized in that the warp threads (^ 4) are independent from the weft threads (Z?) remaining in their original position to their in the thread direction facing end faces are connected to one another. 2. A sieve according to claim 1, characterized in that the connecting points (C) of the warp threads (A) are arranged in two or more rows (1 to 7) having the same or different distances and which have at least one undisturbed stitch between them. ■ "· 3. Sieve according to claim 1 or 2, characterized in that : indicates that the connecting points (C) of the warp threads (Λ) are combined in two groups of rows which are spaced apart by a greater number of meshes. . 4: Screen according to one or more of claims 1 to 3, characterized in that the warp threads (A) are cut at an angle at their connection points (C) and are glued together. 5. Sieve according to one or more of claims 1 to 4, characterized in that the endlessly composed fabric is coated with a cured plastic solution, in particular poly urethane. '..' Considered publications:
German Patent No. 660 162; : German interpretative document No. 1186 730. 1 sheet of drawings 609 759/213 1.67 © Bundesdruckerei Berlin