JP2002180363A - Method and apparatus for strengthening textile web - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a method for strengthening a textile web, especially felt web so as to effectively prevent compression of the face of a web to be strengthened. SOLUTION: The method for strengthening a textile web 8, especially a felt web, by needling parallel yarns 11 in the longitudinal direction is described. In order to provide an advantageous structure of the textile web 8, it is proposed that the yarns 11 are needled on the textile web 8 at a lateral distance from one another and with a needling limited to the yarn zone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for curing a fibrous web, in particular a felt web, by fastening parallel yarns in the longitudinal direction.

[0002]

2. Description of the Related Art In order to reinforce a fiber web, it is known that a reinforcing woven fabric is needle-punched on the web.
This performs compression of the fiber web by needle punching over the entire web surface. This is because the fibrous web must be bonded face-to-face to the reinforcing woven fabric. Furthermore, to a large extent, only fibrous webs that are ready to prepare fibers for needlepunching reinforced fabrics can be reinforced.

[0003] It is known to secure cut pieces of yarn in a random orientation to a carrier web in order to obtain a surface coating formed, for example, from yarns for wall cloths (US Patent Application No. 37/37).
83479). Instead of thread pieces, parallel rows of threads can also be fastened to the carrier web (U.S. Pat. No. 4,595,438), in which a needle punch is performed over the entire carrier web as in fastening thread pieces. Inevitably, a consistent curing of the carrier web takes place.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a fiber web of the first type, in particular a felt web, in order to effectively prevent the compression of the surface of the web to be reinforced. It is to improve the curing method.

[0005]

SUMMARY OF THE INVENTION The present invention solves the given problem by fastening the yarn to the web with a needle punch confined to the yarn area spaced laterally from each other.

By pinning the yarns at intervals and limiting the extent of the needle punch to the yarns, the web can be significantly strengthened in the machine direction without having to accept consistent cure across the width of the web. The properties of the web are therefore maintained between the threads independently of the fastening of the thread, which is important for many uses of such webs. The yarns that are fastened to the web at laterally spaced intervals generally use sufficient fibrous material to ensure effective anchoring of the yarns to the web to be reinforced, or surfaces that are not immediately available otherwise. Further forming the structure, this surface structure provides an advantageous prerequisite for a particular use case when using such a web, for example, with a thread that is individually fastened for a filter.

A web guide having a needle board provided with a needle capable of reciprocatingly driving in the piercing direction and a bead plate facing the needle board so that the bead plate can be pulled out in the web passing direction in order to hold the yarn on the web. We start with a conventional needle punching device that forms a surface. Only sufficient guidance of the thread to be needle-punched into the web need be provided, so that the needles in the appropriate rows do not penetrate the thread and fail. For this purpose, the needles of the needle board penetrate into the guide grooves, since the bed plate has, on the guide surface of the web, parallel guide grooves directed in the direction of web passage for the thread to be fastened. The fiber is drawn from the web and put into the yarn. If the fibers of the yarn form a loop and are drawn into the web, the yarn must be guided on the side of the web facing the needle board, which involves a costly construction.

The method according to the invention will be described in detail with reference to the drawings.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The device according to the embodiment shown has a needle punching device 1 consisting of a bed plate 2, a stripper plate 3 and a needle board 4 inserted into a needle beam 5. The needle beam 5 is reciprocated in the piercing direction of the needle 6 via the eccentric transmission.
However, unlike conventional needle boards, the needles 6 of the needle board 4 are arranged in parallel rows that are oriented in the web passing direction 7 and extend with a clear mutual spacing.

The web 8 to be cured is drawn from a supply roll 9 and, together with a yarn 11 drawn from a supply bobbin 10,
The web 8 is supplied to a pair of entrance rollers 12 of the needle punching apparatus 1 having a bed plate 2 forming a guide surface. The guide surface is provided with a guide groove 13 for the yarn 11. Since the row of needles extends along the guide groove 13, the web 8 covering the guide passage 13 having the yarn 11
The needle 6 is needle-punched together with the web 1 and pierces the web 8 from above.
Penetrate to 1. The web 8 thus hardened can be pulled out of the needle punching device 1 via the pull-out roller pair 14 together with the thread 11 held on the lower side.

Assuming a web having a suitable fiber web structure, rather than penetrating the fibers from the web 8 to the yarn 11, when the fibers penetrate from the yarn to the web 8, the yarn 11 on the side opposite to the bed plate 2 Must be supplied to the web 8. Such thread 1 facing stripper plate 3
The first guidance requires special means. For this purpose, finger-like spacing strips reaching the needle area can be provided for the thread 11, these spacings extending longitudinally through the guiding gap between the bed plate 2 and the stripper plate 3. Between the pieces, the yarn 11 is prevented from deflecting laterally during needle punching.

[Brief description of the drawings]

FIG. 1 shows a simplified side view of an apparatus according to the invention for curing a fibrous web.

FIG. 2 shows a cross section along the line II-II in FIG. 1 on an enlarged scale.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Needle punch apparatus 2 Bed plate 4 Needle board 6 Needle 7 Web passing direction 8 Textile web 11 Thread 13 Guide groove

Claims (2)

[Claims] 1. A method of curing a fibrous web by fastening parallel yarns in the longitudinal direction, wherein the yarns are fastened to the web with needle punches limited to the yarn area at a lateral interval from each other. How to cure the fiber web. 2. A needle board having a needle which can be reciprocally driven in the piercing direction and having a needle, and a bed plate facing the needle board, wherein the bed plate forms a guide surface for a web which can be pulled out in a web passing direction. In one embodiment, the bed plate (2) has, in the guide surface of the web (8), parallel guide grooves (13) directed in the web passing direction (7) for the thread to be fastened (11), Device according to claim 1, characterized in that the needles (6) of the board (4) penetrate into the guide grooves (13).