Basic structure of a clothing for a machine for producing or processing a fibrous material web and method for the production thereof

Abstract

A basic structure of a clothing for a machine for producing or processing a fibrous web, in particular a paper, cardboard or tissue web. The basic structure has at least a first flat fabric of fabric type A and a second flat fabric of fabric type B, and, furthermore, two loop elements. The loop elements are formed in each case from a flat fabric piece which has a first portion of fabric type A and a second portion of fabric type B. The first portion is laid down on the second portion in such a way that the folding point is formed at a spacing of less than 5 cm, in particular less than 1 cm, from the changeover position between the fabric type A and the fabric type B. The first and the second flat fabric are arranged above one another, and the two loop elements are arranged in each case at a face-side, front end.

Claims

1. A basic structure of a clothing, the basic structure comprising: at least one first flat woven fabric of woven fabric type A and at least one second flat woven fabric of woven fabric type B; two loop elements respectively connected between said at least one first flat woven fabric and said at least one second flat woven fabric to form a continuous fabric structure including said at least one first flat woven fabric, said at least one second flat woven fabric and said two loop elements, said two loop elements being respectively formed from a flat woven fabric portion which has a first section of woven fabric type A and a second section of woven fabric type B; said first section of woven fabric type A being laid on said second section of woven fabric type B to form a fold location at a distance of less than 5 cm from a changeover location between said woven fabric type A and said woven fabric type B; and said first flat woven fabric and said second flat woven fabric being arranged on top of one another and said two loop elements being respectively arranged on a front face end.

2. The basic structure according to claim 1, wherein said fold location is formed at a spacing distance of less than 1 cm from said changeover location.

3. The basic structure according to claim 1, wherein one or both of said two loop elements has a front edge of said woven fabric of type A connected said first flat woven fabric and a front edge of said woven fabric of type B connected to said second flat woven fabric.

4. The basic structure according to claim 3, wherein in a first and/or a second of said two loop elements said front edge of said woven fabric of type A is welded to said first flat woven fabric and said front edge of said woven fabric of type B is welded to said second flat woven fabric.

5. The basic structure according to claim 1, wherein in the region of said fold locations of said loop elements, cross machine direction threads are removed so as to form seam loops.

6. The basic structure according to claim 5, wherein 3 to 8 CD threads are removed from each fold location to form said seam loops.

7. The basic structure according to claim 1, further comprising cross machine direction threads (special threads), which are neither in woven fabric type A nor woven fabric type B, provided in direct proximity to said seam loops.

8. The basic structure according to claim 1, wherein said woven fabric types A and B differ in at least one parameter.

9. The basic structure according to claim 8, wherein said woven fabric types A and B have a different weaving pattern or a different CD thread density.

10. The basic structure according to claim 1, comprising a plurality of flat woven fabrics of woven fabric type A and/or a plurality of flat woven fabrics of woven fabric type B.

11. The basic structure according to claim 1, wherein at least one of said woven fabric type A or said woven fabric type B have a machine direction thread density of between 30% and 45%.

12. The basic structure according to claim 11, wherein said thread density of MD threads lies between 34% and 42%.

13. The basic structure according to claim 1 for a clothing of a machine for producing or processing a fibrous material web of paper, cardboard, or tissue.

14. A clothing for a machine for producing or processing a fibrous material web, the clothing comprising at least one basic structure according to claim 1.

15. The clothing according to claim 14 configured for a paper machine for producing or processing fibrous material web of paper, cardboard, or tissue.

16. The clothing according to claim 14, being a seam felt.

17. A method of producing a basic structure of a clothing of a machine for producing or processing a fibrous material web, the method comprising: a) providing at least one first flat woven fabric of woven fabric type A and at least one second flat woven fabric of woven fabric type B; b) providing two flat woven fabric portions, which have a first section of woven fabric type A and a second section of woven fabric type B, connecting the two flat woven fabric portions between the at least one first flat woven fabric and the at least one second flat woven fabric to form a continuous fabric structure, and forming loop elements by laying the first section of fabric type A on the second section of fabric type B to form a fold location at a distance of less than 5 cm from a changeover location between the woven fabric type A and the woven fabric type B; and c) arranging the at least one first flat woven fabric and the at least one second flat woven fabric above one another and the two loop elements respectively on a front end.

18. The method according to claim 17, which comprises forming the fold at a distance of less than 1 cm.

19. The method according to claim 17, further comprising: d) connecting the loop elements to the at least one first flat woven fabric and the at least one second flat woven fabric in such a way that, in the first loop element and the second loop element, in each case a front edge of woven fabric type A connected to the first flat woven fabric and the front edge of woven fabric type B is connected to the second flat woven fabric.

20. The method according to claim 19, which comprises welding the front edge of woven fabric type A to the at least one first flat woven fabric and welding the front edge of woven fabric type B to the at least one second flat woven fabric.

Description

(1) Further advantageous features of the invention will be explained with the aid of exemplary embodiments with reference to the schematic drawings.

BRIEF DESCRIPTION OF THE FIGURES

(2) FIGS. 1a and 1b show a flat woven fabric portion, or a loop element, according to one aspect of the invention

(3) FIG. 2 shows a basic structure according to one aspect of the invention

(4) FIG. 2a shows a basic structure according to a further aspect of the invention

(5) FIG. 3 shows a woven fabric for use in a method according to a further aspect of the invention

DETAILED DESCRIPTION OF THE INVENTION

(6) FIG. 1a shows a flat woven fabric portion 6 which may be used as a basis for producing a loop element 2. The flat woven fabric portion 6 consists of a first section 6a, which is of woven fabric type A, and a second section 6b, which is of woven fabric type B. Woven fabric type A and woven fabric type B may advantageously be provided in that they differ in at least one parameter, in particular a different weaving pattern or a different CD thread density. In terms of production technology, it is highly advantageous for the two woven fabric types to have the same MD thread density. Sometimes, it may also be provided that woven fabric type A is the same as woven fabric type B.

(7) In order to have high flexibility in the production of basic structures 1, or clothings, the flat woven fabric portion should have a short length in MDcompared with the basic structure. In particular, the flat woven fabric portion 6 may be configured to be shorter than 5 m, preferably 2 m or shorter.

(8) The first section 6a and the second section 6b may in this case have the same length. Often, however, it is advantageous for these two sections 6a, 6b to have different lengths. The length ratio is preferably between 40%/60% and 30%/70%. In the case of a flat woven fabric portion 6 having a length of for example 2 m, the first section 6a may be 1.20 m long and the second section 6b may be 0.80 m long.

(9) The different lengths have the advantage that the front edges 3a, 3b do not come to lie directly on one another in the future fold, but are offset.

(10) In order to form a loop element 2 from a flat woven fabric portion 6, the flat woven fabric portion may be folded and placed on itself. This is shown in FIG. 1b. The fold location 4 is in this case arranged in the region of the changeover location 60, in particular on the changeover location 60. In order to form seam loops 5, which serve for subsequently making the basic structure 1, or the clothing, endless, CD threads may be removed at the fold location. Often, it is sufficient to remove between 3 and 8 CD threads. The CD threads may in this case be removed from woven fabric type A and woven fabric type B. If, for example, the removal from one woven fabric type is more complicated than from the other, it is however also possible to remove CD threads from only one woven fabric type. If, as represented in FIG. 1b, the two sections 6a, 6b have different lengths, the front edges 3a, 3b do not come to lie on one another, which may be advantageous for the subsequent further processing.

(11) The two layers of the loop element 2 may advantageously be connected to one another. Such connection may, for example, be carried out using one or more stitch connections 7. Such connection or stitching is advantageous inter alia since the two layers of the loop element 2 cannot be displaced relative to one another during the further processing.

(12) Connection in the region of the seam loop 5, for example at a distance of less than 2 cm from the seam loop 5, may also be advantageous in order to fix the seam loop 5 and subsequently allow easier insertion of two seam loops 5 into one another in order to make the basic structure 1 endless.

(13) FIG. 2 shows a basic structure 1 according to one aspect of the invention. This basic structure is formed from a first flat woven fabric 10 of woven fabric type A and a second flat woven fabric 20 of woven fabric type B, as well as two loop elements 2a, 2b. The loop elements 2a, 2b may in particular be configured as described in FIG. 1a, or 1b.

(14) The first flat woven fabric 10 and the second flat woven fabric 20 are in this case arranged above one another. In a similar way as for the loop elements 2, 2a, 2b, these two layers 10, 20 may also be connected, in particular stitched, to one another. The stitch connections 7 are not represented explicitly in FIG. 2, but may nevertheless be present.

(15) In order to form a continuous basic structure 1, the four components in FIG. 2 are connected to one another.

(16) In this case, in the loop elements 2a, 2b, the front edge 3a of woven fabric type A is connected to the first flat woven fabric 10 and the front edge 3b of woven fabric type B is connected to the second flat woven fabric 20. This connection 8 may in particular be carried out in the form of a weld seam 8. The welding may for example be carried out by laser welding, in particular by laser transmission welding, or by ultrasound welding. As an alternative or in addition, the connection 8 may also be produced in the form of an adhesive connection or a stitch connection.

(17) The basic structure 1 formed in this way has two seam loops 5a, 5b. By inserting these seam loops 5a, 5b into one another and subsequently inserting the pintle wire, the basic structure 1 may be made endless. Often, before making it endless (or afterwards), the basic structure 1 is also provided with further elements, for example nonwoven overlays, additional woven elements, films or foam elements. This depends on the future use of the clothing formed in this way.

(18) While a basic structure 1 consisting of four woven elements, as represented in FIG. 2, is generally advantageous, it is nevertheless possible and provided for that the basic structure may be constructed from more elements. An example of this is represented in FIG. 2a. The basic structure 1 indicated there differs from the basic structure 1 of FIG. 2 in that, in addition to the first flat woven fabric 10 and the second flat woven fabric 20, it comprises a further first flat woven fabric 11 and a further second flat woven fabric 21. The two flat woven fabrics respectively of the same woven fabric type may also be connected to one another in a suitable way, for example by means of a weld seam 8a. This may, for example, be advantageous if the flat woven fabric is not in the form ofquasiendlessroll goods, but of prefabricated woven fabric portions of fixed length. In such a case, in addition to the first (second) flat woven fabric 10 (20) and the further first (second) flat woven fabric 11 (21), even more flat woven fabrics may also be required in a similar way in order to construct the basic structure therefrom.

(19) With reference to the example of FIG. 3, one of the advantages which clothings according to one aspect of the invention have will be explained again. By the separation of the loop elements 2, 2a, 2b from the flat woven fabrics 10, 20, it is possible to produce these woven parts of the basic structure 1 without knowledge relating to the dimension of the future clothing being required for this. In this regard, FIG. 3 shows a woven fabric, the weft direction of the loom corresponding to the CD direction of the future clothing, and the warp direction to the MD direction. In the CD direction, the woven fabric may be produced with the maximum width of the available loom, in order to be able to fulfil all width requirements of the future clothing as far as possible. If narrower clothings are desired, this may be achieved by corresponding trimming. The offcut thereby created also occurs in current production methods, and does not represent a specific disadvantage of the present concept.

(20) In the MD direction, the woven fabric types A and B alternate in a regular pattern. This is based on the length of the flat woven fabric portions 6 subsequently required for the loop elements together with the desired length ratio of the woven fabric types A and B. For example, it may be provided that the flat woven fabric portions 6 have a length of 2 m, the first section 6a having a length of 1.2 m and the second section 6b having a length of 80 cm. The flat woven fabric portions 6 and the sections 6a, 6b may also be longer or shorter. In each case, the woven fabric of FIG. 3 may be preproduced as roll goods with the regular changeover of woven fabric types A and B. In order to produce a basic structure 1, two flat woven fabric portions 6 may be taken from this roll and loop elements 2, 2a, 2b may be formed therefrom. The length required for the specific order, or the basic structure 1, may then be set independently of the loop elements by a suitable length of the first flat woven fabric 10 and of the second flat woven fabric 20.

LIST OF REFERENCES

(21) 1 basic structure 2, 2a, 2b loop element 3a, 3b front edge 4 fold location 5 seam loop 6 flat woven fabric portion 6a first section 6b second section 7 stitch connection 8 weld seam 10, 11 first flat woven fabric 20, 21 second flat woven fabric 60 changeover location