FABRIC WEB MATERIAL AND METHOD FOR THE PRODUCTION THEREOF

Abstract

A web material made of a woven fabric is divided into web sections by tear lines. The tear lines weaken the web material without causing a complete separation of the web sections from the web material. The web sections are separable from the web material by being torn off along the tear lines. Cuts are formed in the woven fabric along transverse sections of each tear line, the transverse sections running essentially transversely to the longitudinal extension of the web material, which cuts are spaced apart from each other and are oriented in the longitudinal direction of the web material or transversely to the transverse section of the tear line, with the cuts being connected to only one transverse section of the tear line.

Claims

1. A process for the production of a web material formed from a woven fabric, wherein the woven fabric is formed from interwoven tapes, in particular plastic tapes, wherein the web material is divided into web sections by tear lines extending across the width of the web material, wherein the tear lines weaken the web material without causing a complete separation of the web sections from the web material, and the web sections are separable from the web material being torn off along the tear lines, wherein each tear line has at least one transverse section running transversely or at least predominantly transversely to the longitudinal extension of the web material, characterized in that cuts are introduced into the woven fabric at the at least one transverse section of the tear line, which cuts are spaced apart from each other and are oriented in the longitudinal direction of the web material or transversely to the transverse section of the tear line, with the cuts being connected to only one transverse section of the tear line.

2. A process according to claim 1, characterized in that the cuts are introduced into the woven fabric in such a way that the cuts will extend only in one of two web sections located opposite to each other on a tear line.

3. A process according to claim 1, characterized in that the cuts are introduced into the woven fabric in such a way that the cuts will extend in both web sections located opposite to each other on a tear.

4. A process according to claim 1, characterized in that the cuts are introduced into the woven fabric across a length of at least one tape width.

5. A process according to claim 1, characterized in that the cuts introduced into the woven fabric at mutual spacings of four to ten tape widths.

6. A process according to claim 1, characterized in that the cuts are introduced into the woven fabric by means of a laser, a mechanical cutting device or a punching device.

7. A process according to claim 1, characterized in that the woven fabric formed by interwoven tapes made of polyethylene, polypropylene and/or polyethylene terephthalate.

8. A process according to claim 1, characterized in that the web material comprises at least two layers of material, wherein at least one material layer is a woven fabric.

9. A process according to claim 8, characterized in that at least one material layer of the web material is formed from polyethylene, polypropylene or polyethylene terephthalate.

10. A web material made of a woven fabric formed from interwoven tapes, in particular plastic tapes, comprising tear lines extending across the width of the web material, which are formed in the web material at a distance from one another and divide the web material web sections, wherein the tear lines weaken the web material without causing a complete separation of the web sections from the web material, and the web sections are separable from the web material by being torn off along the tear line with each tear line having at least one transverse section running transversely or at least predominantly transversely to the longitudinal extension of the web material, characterized in that cuts are formed in the woven fabric the at least one transverse section of the tear line, which cuts are spaced apart from each other and are oriented in the longitudinal direction of the web material or transversely to the transverse section of the tear line, with the cuts being connected to only one transverse section of the tear line.

11. A web material according to claim 10, characterized in that the cuts are formed in the woven fabric in such a way that the cuts will extend only in one of two web sections located opposite to each other on a tear line.

12. A web material according to claim 10, characterized in that the cuts are formed in the woven fabric in such a way that the cuts will extend in both web sections located opposite to each other on a tear line.

13. A web material according to claim 10, characterized in that the cuts are formed in the woven fabric across a length of at least one tape width.

14. A web material according to claim 10, characterized in that the cuts are formed in the woven fabric at mutual spacings of four to ten tape widths.

15. A web material according to claim 10, characterized in that the tapes are formed from polyethylene, polypropylene or polyethylene terephthalate.

16. A web material according to claim 10, characterized in that the web material comprises at least two layers of material, wherein at least one material layer is a woven fabric.

17. A web material according to claim 16, characterized in that at least one material layer of the web material is formed from polyethylene, polypropylene or polyethylene terephthalate.

18. A sack, characterized in that the sack is formed from a web section of a web material according to claim 10.

Description

[0018] Further advantageous embodiments of the process according to the invention and of the web material according to the invention are explained in further detail below with reference to the figures.

[0019] FIG. 1 shows a first embodiment of the web material according to the invention in sections in an isometric view.

[0020] FIG. 2 shows a further embodiment of the web material according to the invention in sections in a plan view.

[0021] First, reference is now made to FIG. 1, which shows a first embodiment of a web material 1 according to the invention in sections in an isometric view. The web material 1 is formed from a woven fabric 1a shaped into a tube and produced, for example, in a circular loom. The woven fabric 1a is formed from interwoven tapes 2a (weft tapes) and 2b (warp tapes). The tubular web material 1 is laid flat, whereby two edges 3 and an upper side 4 and a lower side 5 are formed.

[0022] The web material 1 has tear lines 6 which are formed in the web material 1 at a distance from one another and define web sections 7 of a length corresponding to the distance between adjacent tear lines 6. If the web material serves for the production of sacks, the web sections 7 form sack bodies, and the length of the web sections defines the length of the sack body. For reasons of simplification, only one tear line 6 is shown in FIG. 1. The tear line 6 runs around the tubular web material 1 in a stepped manner, the tear line 6 being illustrated as a dashed line on the lower side 5. As can be seen in FIG. 1, the tear line 6 runs differently on the lower side 5 compared to the upper side 4.

[0023] The tear line 6 is designed so as to be stepped in order to form stepped gusseted sacks from the web sections and comprises a plurality of transverse sections 6a interconnected by longitudinal sections 6b. The transverse sections 6a of the tear line 6 run essentially transversely to the longitudinal extension of the web material 1. The longitudinal sections 6b of the tear line 6 run essentially in the direction of the longitudinal extension of the web material.

[0024] The tear lines 6 divide the tubular web material 1 into adjacent or, respectively, oppositely located web sections 7, with the tear lines 6 weakening the web material 1 without causing a complete separation of the web sections 7 from the web material 1. By applying an appropriate force onto the web material 1, web sections 7 can be separated from the web material 1 along the tear line 6 by being torn off.

[0025] According to the invention, cuts 8 spaced apart from each other are formed in the woven fabric la at the transverse sections 6a of the tear line 6, these cuts 8 extending in the longitudinal direction of the web material 1 or transversely to the transverse sections 6a of the tear line 6. The cuts 8 are each connected to only one of the transverse sections 6a of the tear line 6, i.e., they do not serve for connecting adjacent transverse sections 6a to each other. Rather, such a connection is exclusively the task of the longitudinal sections 6b of the tear line 6. In this embodiment, the cuts 8 extend in both web sections 7 divided by the tear line 6.

[0026] The cuts 8 are formed in the web material 1 across a length of approximately three tape widths and with a mutual spacing of five to six tape widths along the transverse sections 6a of the tear line 6 in the woven fabric 1a.

[0027] The cuts 8 divide at least those tapes 2a into individual pieces which run closest to the tear line 6. As a result of this division, those sections of the tape 2a which possibly become unthreaded from the web material 1 when web sections 7 are being torn off are limited in terms of their length. Hence, only short sections of tapes 2, if any, can stick out after the tearing-off process. As a result, the optical appearance of the web sections 7 after they have been torn from the web material 1 is improved.

[0028] FIG. 2 shows a further embodiment of the web material 9 according to the invention in sections in a schematic plan view. The web material 9 is formed from a flat woven fabric 9a, the woven fabric 9a being formed from interwoven tapes. During further processing, this flat woven fabric is shaped into a tube. For clarity, the woven fabric 9a is not depicted in detail in FIG. 2. In FIG. 2, the tubular web material 9 lies flat on a support.

[0029] The web material 9 is divided into web sections 11 by tear lines 10. In this embodiment variant, too, the tear lines 10 only weaken the web material 9, but do not cause a complete separation of the web sections 11. As can be seen clearly in FIG. 2, the tear lines 10 run through the woven fabric in a stepped manner also in this embodiment and each have a plurality of transverse sections 10a interconnected by longitudinal sections 10b. The transverse sections 10a of the tear lines 10 run essentially transversely to the longitudinal extension of the web material 9. The longitudinal sections 10b of the tear lines 10 run essentially in the direction of the longitudinal extension of the web material 9. The web sections 11 can be separated from the web material 9 by being torn off along the tear lines 10.

[0030] Cuts 12 spaced apart from each other are formed in the woven fabric 9a along the transverse sections 10a of the tear lines 10, these cuts 12 extending in the longitudinal direction of the web material 9 or transversely to the transverse sections 10a of the tear lines 10. The cuts 12 are each connected to only one of the transverse sections 10a of the tear lines 10, i.e., they do not serve for connecting adjacent transverse sections 10a to each other. Such a connection is exclusively the task of the longitudinal sections 10b of the tear lines 10. The cuts 12 each extend in both web sections 11 located opposite to each other on a tear line 10.

[0031] In the web material 9, the cuts 12 are formed across a length of four to five tape widths and with a spacing of eight to ten tape widths along the transverse sections 10a of the tear lines 10 in the woven fabric 9a.

[0032] Similarly to the embodiment of the web material 1 as illustrated in FIG. 1, in this embodiment, too, the tapes extending closest to the tear line 10 are divided, whereby only short sections of tapes—if any—become unthreaded when web sections 11 are being torn off. As a result, the optical appearance of the web sections 11 after they have been torn from the web material 9 is improved.

[0033] It should be mentioned that the course of the tear lines 6 and 10, respectively, is determined according to the further use of the web sections 7 and 10, respectively. Furthermore, it should be indicated that the cuts 8 and 12, respectively, can also be formed obliquely to the respective tear lines 6 and 10 in the woven fabric, or some cuts 8 and 12, respectively, can be formed transversely and some cuts 8 and 12, respectively, can be formed obliquely to the respective tear lines 6 and 10 in the woven fabric.

[0034] Sacks for loose material can, for example, be folded from the web sections 7 and 10, respectively, wherein the woven fabric can be coated. However, there is also the possibility that the web material 1 or 9 comprises only the woven fabric 1a, 9a and the web sections are supplied to another use.