GB2209544A

GB2209544A - Method for the production of net-like sheet structure

Info

Publication number: GB2209544A
Application number: GB8820789A
Authority: GB
Inventors: Eberhard Abendroth; Peter Zeisberg; Heiner Vogel; Sylvia Kappler; Wolfgang Wunsch; Gunter Tasler; Werner Franke; Karl-Heinz Lehmann
Original assignee: Kombinat Textima VEB
Current assignee: Kombinat Textima VEB
Priority date: 1987-09-04
Filing date: 1988-09-02
Publication date: 1989-05-17
Also published as: FR2620139A1; FR2620139B1; DE3826357A1; DD269298A3; GB8820789D0

Description

1 m 1 It 2209541t METHOD FOR THE PRODUCTION OF SEW-WOVEN, NET-LIKE SHEET

STRUCTURE This invention relates to a method for the production of a sew-woven, net- like sheet structure on a sew-weaving machine equipped with a row of slider needles, in which weft elements are connected with warp elements to form the sheet structure by means of stitches formed of filaments.

A method and a machine according to the features named in the introduction have already been disclosed (US-PS 3 603 114).

In this method, finished textile filaments are used as weft and warp elements.

The connecting of the weft elements to the warp elements is carried out in that method by means of warp f ilaments or sewing -filaments, which are twisted to form a knitted connection.

The use of finished textile filaments as weft and warp elements is accompanied by higher costs, compared with general material strips, sheet strips, fibre rovings, fibre hanks, rovings. or the like.

These cheaper materials cannot, however, be fed to the machine as weft and warp elements and converted to a textile sheet fabric consisting of filaments, because it is not possible with the machine, in addition to the production of the sheet structure, to improve these weft and warp elements, which initially do not possess the structure of textile filament material, to a filament-like POOR QUALITY 2 quality of filament-like structures.

With the invention, the reduction of the aforementioned disadvantages and a less expensive manner of producing sew-woven sheet structures which are composed, in weft and warp, of filaments is aimed at.

The objective posed for the invention was to create a method for the production of a sew-woven, net-like sheet structure, by which weft and warp elements, such as in particular sheet strips, which initially do not possess the structure of textile filaments, can be worked into a textile sheet structure consisting of filaments, wherein an improvement of the weft and warp elements to a fi.lament-like quality or to filament-like structure can also be carried out on the machine which produces the sheet structure.

According to the present invention the weft and warp elements are sheathed. In an advantageous case the sheating of the weft elements is carried out before they are connected with the warp elements and the latter are sheathed during this connection, and the connection of the weft elements to the warp elements is effected also simultaneously, with the filaments that form the sheathing of the warp elements.

A further process feature consists in that the weft elements and the warp elements are given a sheathing before they are connected together and that the warp elements are sheathed a second time during this connecting operation, the connecting of the weft and warp elements together being carried out also simultaneously, by the filaments of the second sheathing.

11 1 3 1 The method includes also a working sequence, according to which the sheathing of the weft elements takes place during the production of the sewwoven sheet structure at a section of the mesh-forming station of the sew-weaving machine which is not used for forming the sheet structure, and that the weft elements thereupon, after they have been pulled from the meshforming station, are fed to this station a second time and are processed in a different section of the production of the mesh-forming station, in which the sheet structure is carried out.

It is also a subject of the method that the weft elements and the warp elements are treated in the manner explained in the previous paragraph in respect of the weft elements only.

Claims

Further features of the invention will be seen from the sub-Claims. With the method according to US-PS 3 058 193, it has indeed already been disclosed to sheath non-woven strips in order to produce filament-like structures or chenille, but it is not possible simultaneously with the sheathing to carry out also production of a sheet structure by means of the filament-like structure. Moreover, the known method cannot serve for utilising the sheathing filaments also as a connecting filament for the weft and warp elements. The method according to this invention leads basically to the following advantages: 1. Weft and warp elements, such as for example sheet strips, which initially do not possess the structure of 4 textile filaments and therefore can only be woven with difficulty or indeed not at all, can be improved to a filament-like quality on the machine that produces the sheet structure. 2. By using the improved weft and warp elements, a textile sheet structure, which is composed of filaments or filament-like structures, can be produced in a continuous process. 3. The sheathing of the warp elements can be carried out during the connecting of these elements to the weft elements, and the warp elements are also sheathed with the connecting filaments. As as result of these advantages, the invention provides a sew-woven, netlike sheet structure, economical to manufacture, which can be used particularly advantageously as agricultural textile or geotextile. Nets for fishing or other purposes can also be produced inexpensively and appropriate for their use by this invention. The invention is explained in more detail by means of an example of embodiment thereof. The Figures in the associated drawings show: Fig. 1: a schematic front view of the mesh forming station of a sewweaving machine, showing a sketched netlike sheet structure and feeds for weft and warp elements, Fig. 2: an enlarged portion of a sheathed weft or warp element in an unstretched condition and tP 0 Fig. 3: the same as Fig. 2, but with a different type of sheathing. According to Fig. 1, the mesh forming station of the sewweaving machine comprises a row ot slider needles 1, the slider needles la of which have U-shaped cross-sections, and in which sliders lb slide to and fro. A number of eye-pointed needles 2 cooperates with the slider needle row 1. Through the eye-pointed needles 2, sewing filaments 3 are threaded, which the slider needles 1 convert into stitches, in order thereby to sheath weft and warp elements 4; 5 with a known stitch arrangement and to connect them together. According to the chosen example of Figure 1, the mesh forming station has been divided into three sections A, B and C. Section A serves for improving warp elements 5, such as for example general material strips, sheet strips, fibre rovings, fibre hanks, rovings or the like, by sheathing into filament-like structures of smaller diameter. For this purpose, warp elements 5 are fed to the slider needles la, by the warp elements being previously pulled, above the slider needles la, through a narrowingdown device 6 provided with apertures, in order to adopt the cross-section of filaments. After the narrowing-down, sheathing of the warp elements 5 is carried out by means of the sewing filaments 3, which are worked into chain stitches. In doing this, the warp elements 5 are shifted to and fro, either around one slider needle la or around two slider needles la, so that the warp elements 5, in the first case, are sheathed by one chain stitch row (Fig. 2) and, in the second case, by two chain stitch rows (Fig. 6 3). To enable the theoretical form of the stitches of the chain stitching to be shown, the sections of sheathed warp elements 5 have been illustrated in an unstretched condition. In practice, however, the warp elements 5 appear in substantially stretched form, the chain stitches constituting, in an appropriately distorted and stretched form, the sheathing. The shifting of the warp elements 5 around the slider needles la is carried out by means of the narrowing-down device 6, which is constructed to move to and fro. The narrowing-down device 6 can also be moved up and down during the feed of the warp elements 5. The narrowingdown device 0' is constructed, in addition to its shifting capability, at least to be adjustable in the region above the slider needles!a. The crossed arrow X indicates the aforementioned directions. The sheathed warp elements 5, improved into filament-like structures, can then be fed, either directly or via a known intermediate store such as, for example, a magazine frame connected in series with a winding device, to section B of the mesh forming station. Guide rollers 7 to 14 are provided for direct feed of the warp elements 5 into section B. In section B of the mesh forming station, the connecting of the warp elements 5 to the weft elements 4 to give a net-like, sew-woven sheet structure is then carried out, as will be explained in more detail in a succeeding part of this description. The weft elements 4; 4'; 4" are prepared in section C of J 7 the mesh forming station. This procedure takes place in a manner analogous to that for the warp elements in section A. Weft elements 4; 4'; and C may also consist of general material strips, sheet strips, fibre rovings, fibre hanks, roving or the like. A narrowing-down device 15 fulfils the same functions in section C as the narrowing-down device 6 in section A. After sheathing of the weft elements 4, 4' and 4" has been carried out, it is possible, in one case, to feed only one weft element 4 to section B of the mesh forming station and to reel and temporarily store the other weft elements 4' and 4". In section C of the mesh forming station of Fig. 1, it is accordingly shown schematically that the weft element 4 runs over a guide roller 16 directly into section B, and that the wef t element 4' and 4" are reeled up, using guide rollers 17, 18, in order to serve as a reserve available immediately or later. Suitable known winding devices can be connected in a sequence 'with one another, in order to make possible a magazine-like storage of the weft elements 4' and 4". Although in Fig. 1 for the sake of simplicity only a few weft and warp elements 4; 5 have been assumed, it will be understood that the invention is, of course, concerned with using a large number of weft and warp elements 4; 5. Thus, in a different application, all the weft elements 4; 4' and 4" can be fed into section B and other weft elements, not shown, can be temporarily stored. Depending upon the density that a sheet structure to be produced should have, any numbers of weft elements 4 and warp elements 5 may be used. 8 The introduction or feeding-in of the weft elements 4 into section B of the mesh forming station is carried out by means of a weft element placing device 19, which may be constructed and operated according to the examples of USPS 3 665 732; US-PS 3 756 043 or DD-PS 255 853. If weft elements 4 are to be fed in diagonally, then the procedure according to DD-PS 217 553 can be adopted. Basically, within the scope of the present invention the free choice is available of providing the weft elements 4 perpendicularly and/or obliquely to the working direction, since many of the known methods of placing weft elements 4 can be employed. The operation of connecting the weft elements 4 to the warp elements 5 in section B of the mesh forming station is now as follows. The warp elements 5 which run, above the row of slider needles 1, through a reciprocating (direction of arrow Y) guide means 20, are displaced around one or two slider needles la and placed on the weft elements 4. BY means of the sewing filaments 3 threaded through the eye-pointed needles 2, which are formed into chain stitch lines, the weft and warp elements 4; 5 are provided with their connections at the crossing points. Before the connection is made, the weft element placing device 19 introduces one or more weft elements 4 beneath the slider needle row 1. According to section B of Fig. 1, one weft element 4 is introduced at each connecting cycle. Due to the fact that the warp elements 5 are already sheathed in section A, the warp elements 5 are sheathed z i 9 9 agai n a second t i me dur i ng connect i on w i th the we f t elements 4 by the same filaments 3. The invention proves to be especially advantageous, however, when unsheathed warp elements S' are fed to section B of the mesh forming station. These elements should then be conducted through a further narrowing-down device 21, which fulfils the same functions as the narrowing-down devices 6; 15. In the result of this process variant, the warp elements S' are sheathed only once. simultaneously with the connection to the weft elements 4. If the nature of the warp elements S; S' or also of the weft elements 4 requires, the narrowing-down can be carried out in several steps, for which purpose, for example, one additional device of this type would need to be provided above each of the narrowing-down devices 6; 15; 21. A further effect arising from this invention consists in that the compactness of the sew-woven sheet structure can be varied, by the narrowing-down devices 6; 15; 21 or the guide means 20 being moved additionally up and down above the slider needle row 1. In section B of Fig. 1, various warp elements 5; S' have been illustrated and paired with the uniform weft elements 4. In practice, either warp elements 5 or warp elements S' will preferably be used. It was desired, however, to show both variants in one illustration of a net-like sheet structure. To summarize, from the above explanations, the following two aspects of the invention which should be emphasized appear amongst others.

1 1 1. The weft elements 4 can be sheathed in time before they are connected with the warp elements 5 and the latter be sheathed during this connection, the connecting of the weft elements with the warp elements being carried out also simultaneously with the sewing filaments 3 which constitute the sheathing of the warp elements 5.

P 2. The sheathing of the weft elements 4 can be carried out during the production of the sew-woven sheet structure at section C of the mesh forming station, which is not used for the production of the sheet structure, and these weft elements 4 can thereupon, after they have been pulled from the mesh forming station, be fed again to this station a second time and processed in section B, in which the production of the sheet structure is carried out.

The individual detailed functions of sections A, B and C can, of course, be varied or allocated in a different manner, without thereby departing from the invention.

11 V 17 CLAIMS 1. Method for the production of a sewwoven, net-like sheet structure on a sew-weaving machine eguipped with a row of slider needles, in which weft elements are connected with warp elements to form the sheet structure by means of stitches formed of filaments, characterized in that the weft and warp elements are sheathed.

2. Method according to Claim 1, characterized in that the weft and warp elements are sheathed by means of stitches of the chain stitch binding.

3. Method according to Claim 1 or 2, characterized in that the weft elements are sheathed in time before the connection with the warp elements and the latter are sheathed during the connection, the connection between the weft elements and warp elements being effected also simultaneously, with the filaments which form the sheathing of the warp elements.

4. Method according to Claim 1 or 2, characterized in that the weft elements and the warp elements are provided with a sheathing before the connection, and that the warp elements are sheathed a second time during the connecting toghether, the connection of weft elements and warp elements being carried out also simultaneously, with the filaments of the second sheathing.

5. Method according to any one of Claims 1 to 3, characterised in that the sheathing of the weft elements is carried out during the production of the sew-woven sheet structure at a section of the mesh forming station of the sew-weaving machine which is not used for the production of the sheet structure, and that the weft elements are thereupon, after they are pulled from the mesh forming station, fed to the latter a second time and are processed in a different section of the mesh forming station in which the production of the sheet structure is carried out.

6. Method according to Claim 1, 2 or 4, characterized in that the weft elements and the warp elements are treated in the same manner as the weft elements alone according to Claim 5.

7. Method according to any one of Claims 1 to 6, characterised in that the weft and warp elements are displaced to and fro during the sheathing.

8. Method according to Claim 4, 6 or 7, characterized in that the warp elements are fed directly to the mesh forming station after sheathing.

9. Method according to Claim 4, 6 or 7, characterised in that the warp elements are wound onto an intermediate store after sheathing.

10. Method according to any one of Claims 3 to 7, characterized in that the weft'elements are wound onto an intermediate store after sheathing.

11. Method according to any one of Claims 1 to 10, characterized in that sheet strips are used as weft and warp elements.

12. Method according to any one of Claims 1 to 11, characterized in that the sheet strips, before they pass q 1 1 1 13 into the mesh forming station, are narrowed down to a smaller width.

13. Method according to Claim 12, characterized in that the narrowingdown of the sheet strips takes place at various distances from the mesh forming station.

14. Method according to Claim 12 or 13, characterized in that the narrowing-down of the sheet strips is carried out in two successive steps.

is. Method according to any one of Claims 1 to 14, characterized in that the weft and warp elements are laid one upon another approximately perpendicularly and are processed into a net having square apertures.

16. sew-woven, net-like sheet structure, characterized in that onto a first layer of sheathed, approximately mutually parallel weft elements 4, a second layer of sheathed, also approximately mutually parallel warp elements 5 is attached, the warp elements 5 being situated substantially perpendicularly on the weft elements 4, and that the weft and warp elements 4; 5 are connected together at crossing points by filaments 3, which also form the sheathing of the warp elements 5.

17. A method as claimed in claim 1, substantially as hereinbefore described.

18. A sew-woven, net-like sheet structure substantially as described with reference to any one of the embodiments shown in the accompanying drawings.

Published 1988 at The Patent Office. State House. 6671 High Holborn. London WC1R 47 F Further copies mkv be obtained frorn The Pat-ent Office, Sales Branch, St Mary Cray. orpington. Kent BR5 3RD Printed by Muluplex techniques ltd. S Maiy Cray, Kent Con, 1 87