U.S. patent application number 09/965918 was filed with the patent office on 2002-05-23 for method and apparatus for strengthening a textile web.
Invention is credited to Fehrer, Monika.
Application Number | 20020059707 09/965918 |
Document ID | / |
Family ID | 3689454 |
Filed Date | 2002-05-23 |
United States Patent
Application |
20020059707 |
Kind Code |
A1 |
Fehrer, Monika |
May 23, 2002 |
Method and apparatus for strengthening a textile web
Abstract
A method and an apparatus for strengthening a textile web (8),
especially a felt web, by needling parallel yarns (11) in the
longitudinal direction are described. In order to provide an
advantageous structure of the textile web (8) it is proposed that
the yarns (11) are needled onto the textile web (8) at a lateral
distance from one another and with a needling limited to the yarn
zones.
Inventors: |
Fehrer, Monika; (Leonding,
AT) |
Correspondence
Address: |
Kurt Kelman
COLLARD & ROE, P.C.
1077 Northern Boulevard
Roslyn
NY
11576
US
|
Family ID: |
3689454 |
Appl. No.: |
09/965918 |
Filed: |
September 28, 2001 |
Current U.S.
Class: |
28/107 |
Current CPC
Class: |
D04H 3/105 20130101;
D04H 13/00 20130101; D04H 1/46 20130101; D04H 18/02 20130101 |
Class at
Publication: |
28/107 |
International
Class: |
D04H 018/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 22, 2000 |
AT |
A 1961/2000 |
Claims
1. A method for strengthening a textile web, especially a felt web,
by needling parallel yarns in the longitudinal direction, wherein
the yarns are needled onto the textile web at a lateral distance
from one another and with a needling limited to the yarn zones.
2. An apparatus for performing the method as claimed in claim 1
with a drivable needle board equipped with needles and
reciprocating in the direction of the needle penetration and with a
stitch base opposite of the needle board which forms a guide
surface for the textile web which can be drawn off in the direction
of passage of the textile web, wherein the stitch base (2) is
provided in the guide surface for the textile web (8) with parallel
guide grooves (13) for the yarns (11) to be needled, which grooves
are aligned in the direction of passage (7) of the textile web (8)
and that the needles (6) of the needle board (4) penetrate the
guide grooves (13).
Description
FIELD OF THE INVENTION
[0001] The invention relates to a method for strengthening a
textile web, especially a felt web, by needling parallel yarns in
the longitudinal direction.
DESCRIPTION OF THE PRIOR ART
[0002] In order to strengthen nonwoven fabric it is known to needle
said nonwoven webs with a reinforcing fabric. This is connected to
a condensing of the nonwoven caused by the needling, which occurs
over the entire surface of the nonwoven because the nonwoven needs
to be connected with the reinforcing fabric all over. An additional
factor is that substantially only nonwovens can be strengthened
which can provide respective fibers for needling with the
reinforcing fabric.
[0003] In order to obtain a surface covering for wallpaper for
example it is known (U.S. Pat. No. 3,783,479 A) to needle cut yarn
sections in an entangled position onto a backing. Yarns positioned
parallel adjacent to one another could also be needled onto a
backing material (U.S. Pat. No. 4,595,438 A). There is a needling
over the entire surface of the backing as in the needling of yarn
sections, which thus consequently leads to a consistent
strengthening of the backing.
SUMMARY OF THE INVENTION
[0004] The invention is thus based on the object of providing a
method for strengthening a textile web, and especially a felt web,
of the kind mentioned above in such a way that a planar condensing
of the textile web to be strengthened is effectively prevented.
[0005] The invention achieves the object in such a way that the
yarns are needled onto the textile web at a lateral distance from
one another and a needling limited to the yarn zones.
[0006] By needling the yarns at a mutual distance from one another
and as a result of limiting the needling zone to the yarns, the
textile web can be strengthened substantially in the longitudinal
direction without having to accept any consistent strengthening of
the textile web over its width. The properties of the textile web
are therefore maintained between the yarns irrespective of the
needling of the yarns, which is relevant for a number of
applications of said textile webs. The yarns which are needled onto
the textile web at a lateral distance from one another and usually
provide sufficient fiber material in order to ensure an effective
anchoring of the yarns with the textile web to be strengthened also
form a surface structure which cannot be easily achieved and
represents advantageous preconditions for certain applications,
e.g. in the use of such textile webs with individually needled
yarns for filters.
[0007] In order to perform the needling of yarns onto the textile
web it is possible to assume a conventional needling device with a
drivable needle board reciprocating in the direction of the needle
penetration and a stitch base opposite of the needle board which
forms a guide surface for the textile web which can be drawn off in
the direction of passage of the textile web. It is merely necessary
to ensure a sufficient guidance of the yarns to be needled with the
textile web, so that the needles disposed in respective rows cannot
miss the yarns. For this purpose the stitch base can be provided in
the guide surface for the textile web with parallel guide grooves
for the yarns which are aligned in the direction of passage of the
textile web, so that the needles of the needle board penetrate the
guide grooves and draw fibers from the textile web and introduce
the same into the yarn. If fibers of the yarns are to be drawn into
the textile web, the yarns must be guided on the side of the
textile web facing the needle board, which entails a more complex
construction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The method in accordance with the invention is explained in
closer detail by reference to the enclosed drawings, wherein:
[0009] FIG. 1 shows an apparatus in accordance with the invention
for strengthening a textile web in a simplified side view, and
[0010] FIG. 2 shows a sectional view along line II-II of FIG. 1 on
an enlarged scale.
[0011] The apparatus according to the shown embodiment is provided
with a needling device 1 consisting of a stitch base 2, a stripper
3 and a needle board 4 which is inserted in a needle beam 5. The
needle beam 5 is driven in a reciprocating manner by way of an
eccentric drive in the direction of penetration of the needles 6.
In contrast to conventional needle boards, the needles 6 of the
needle board 4 are disposed in parallel rows aligned in the
direction of passage 7 of the textile web, which rows extend with a
substantial lateral distance from one another.
[0012] The textile web 8 to be strengthened is drawn off from a
supply roll 9 and supplied simultaneously with yarns 11 drawn off
from supply coils 10 to the pair of input rollers 12 of the
needling device 1 whose stitch base 2 forms a guide surface for the
textile web 8. Guide grooves 13 for yarns 11 are provided in the
guide surface. Since the rows of needles extend along the guide
grooves 13, the textile web 8 which covers the guide grooves 13
with the yarns 11 is needled with yarns 11, with the needles 6
which penetrate the textile web 8 from above drawing fibers from
the textile web 8 and needling them into yarns 11. The textile web
8 thus strengthened with the yarns 11 needled onto the lower side
can then be drawn off by way of a pair of draw-off rollers 14 from
the needling device 1.
[0013] If it is not intended to needle fibers from the textile web
8 into the yarns 11, which requires a textile web with a respective
fiber structure, but instead fibers from the yarns 11 to the
textile web 8, it is necessary that the yarns 11 of textile web 8
are supplied on the side opposite of the stitch base 2. The
guidance of such yarns 11 facing the stripper 3 requires special
measures. For this purpose finger-like spacer elements for the
yarns 11 can be provided which reach into the needle zones, which
yarns 11 are prevented from a lateral migration during the needling
between said spacer elements which extend in the longitudinal
direction through the guiding gap between stitch base 2 and
stripper 3.
* * * * *