CZ20013742A3 - Process and apparatus for strengthening strips of fabric - Google Patents

Abstract

A method for strengthening a textile web, especially a felt web, comprises the process of needling parallel yarns 11 to the web in the longitudinal direction of the web, wherein the yarns are needled onto the textile web at a lateral distance from one another and with needling limited to the yarn zones. An apparatus for strengthening a textile web comprises a needle board equipped with needles, and a stitch base located opposite the needle board and forming a guide for the textile web, wherein the stitch base is provided with parallel guide grooves aligned in the direction of passage of the textile web and which receive yarns to be needled to the web, and the needles of the needle board only penetrate the guide grooves.

Description

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a method for strengthening a textile web, in particular a felt web, by needling threads parallel in the longitudinal direction. The invention further relates to an apparatus for carrying out this method.

BACKGROUND OF THE INVENTION

For reinforcing fibrous webs, it is known to connect these webs by needling with a reinforcing fabric, but this is associated with densification of the fibrous web resulting from needling over the entire surface of the web, since the web must be flatly connected to the reinforcing fabric. In addition, only the fibrous webs can be reinforced, which can provide the corresponding fibers for needling with the reinforcing fabric.

In order to obtain a surface treatment material made of yarns, for example for wallpaper, it is known, for example, from U.S. Pat. No. 3,783,479, to stitch undirected cut pieces of thread on the carrier web, of the carrier belt, which necessarily leads to continuous strengthening of the carrier belt.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve the method of reinforcing textile belts, in particular felt belts of the aforementioned type, so as to effectively prevent the surface densification of the reinforced textile belt.

• ···· • « • « • •and ·· • • • • ·· • • · • · i · • · • • · • · · ··· ·· • · ··

-.2—

SUMMARY OF THE INVENTION

The invention proposes a method for strengthening a textile web, especially a felt web, by needling parallel yarns arranged longitudinally, whose principle consists in that the yarns are needled onto the textile web at a mutual paragraph ^(PEM in a lateral direction, and a needling limited to the field * thread.

By connecting the yarns with spacing to each other, and by having the needling area limited to the yarn area, the textile web can be considerably strengthened in the longitudinal direction without having to continuously densify the web over its width. Therefore, the properties of the textile belt remain between the yarns independently of the needling of the yarns, which is important for many applications of such textile belts. In addition, the spun-bonded yarns of the textile web, which generally provide sufficient textile material to provide effective anchoring of the yarns with the reinforced textile web, form a surface structure that is otherwise not readily achievable and which provides advantageous prerequisites for certain areas of application, for example when using such textile belts with individual threads needled thereto for filters.

For attaching the threads by needling to the textile belt, it is also possible to start from a known needling apparatus comprising a needle plate reciprocating back and forth in the needling direction provided with needles and a needle pad positioned against the needle board forming the guide surface for the textile belt in the direction of its passage through the device. It is only necessary to ensure that the threads to be threaded are sufficiently accurate

• ·· »· · and ·· · · * · · »* • · and a • a a • · and • · 9 9 9 • · • 999 99 • · 999

They should be stitched together with the textile belt so that the needles arranged in corresponding rows cannot miss the needled threads. To this end, the needling pad may comprise parallel guide channels in the textile belt guide surface arranged in the direction of passage of the textile belt for needled threads, the needles of the needle plate being stitched into the guide channels while pulling fibers out of the textile belt and of threads. If the yarns are to be pulled into the textile belt with the formation of loops, then the yarns must be guided on the side of the textile belt facing the needle board, which entails a more expensive construction.

BRIEF DESCRIPTION OF THE DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified side elevational view of the webbing reinforcing apparatus of the present invention; and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

DETAILED DESCRIPTION OF THE INVENTION

The device according to the illustrated embodiment comprises a needling device 1 consisting of a needling pad 2, a wiper and a needle plate 4 which is inserted in the beam 5. The needle plate beam 5 is reciprocally driven back and forth by an eccentric drive in the needle needling direction. from the known needle plates, however, the needles 6 of the needle plate 4 are arranged in parallel rows, arranged parallel to the direction of passage 7 of the device, which are arranged with distinct spacing from one another.

The textile web 9 to be strengthened is withdrawn from the 9 9. 91

4, and at the same time it is fed with the yarns 11 withdrawn from the stock bobbins 10, between a pair 12 of the feed rollers of the needling device 1, the needling pad 2 forming the guide surface for the textile strip 8. Since the rows of needles extend along the guide channels 13, the textile strip 8, which covers the guide channels 13 with the yarns 11, is interconnected with the yarns 11 by needling, wherein the needles 6 stitching from above into the textile strip 8 pull out The textile web 8 with threads 11 attached by needling on its underside, reinforced in this way, can then be withdrawn by means of a pair of take-off rollers 14 from the needling device 1.

If the fibers of the textile web 8 are not to be needled into the yarns 11, which is believed to be a textile web with a corresponding fiber structure, but are to be stitched from the yarn 11 into the textile web 8, the yarns 11 must be fed 2. The guidance of such yarns 13 facing the wiper 3 requires special precautions. For this purpose, finger-like distance holders 11 extending into the area of needles may be used to prevent lateral deflection between these distance holders arranged in the longitudinal direction between the needle pad 2 'and the wiper.

Claims (2)

Method for strengthening a textile web, in particular a felt web, by needling parallel threads arranged in the longitudinal direction, characterized in that the yarns are attached by needling to the textile web with lateral spacing relative to each other by needling limited to the thread regions. Apparatus for carrying out the method according to claim 1, comprising a needle plate reciprocating back and forth in the needling direction provided with needles, and a needle pad positioned against the needle board which forms a guide surface for the textile strip retractable in the direction of its passage through the device. in that the needling pad (2) comprises in the guide surface for the textile web (8) parallel guide channels (13) arranged in the direction (7) of the textile web passage (8) for the threads (11) connected by needling, wherein the needles (6) of the needle plate (4) are inserted into the guide channels (13).