Title of Invention

A PROCESS FOR PRODUCING A FLEECE WITH METALLIC WIRE FILAMENTS AND A FLEECE

Abstract A process for producing a fleece (1) comprising metallic wire filaments (2), using at least the following steps: a) forming a layer (3) comprising wire filaments (2); b) producing first cohesive connections (4) between at least some of the metallic wire filaments (2) using a first joining process; c) producing second cohesive connections (5) between metallic wire filaments (2) using a second joining process. The invention also describes corresponding fleeces and advantageous possible uses, for example in the treatment of exhaust gas from motor vehicles.
Full Text - 1 -
Joining of metallic wire filaments to form fleeces to
produce honeycomb bodies
The present invention relates to a process for
producing a fleece comprising metallic wire filaments,
and to a process for producing a honeycomb body having
at least one fleece, and also to a fleece having a
multiplicity of metallic wire filaments and a honeycomb
body formed therewith.
Metallic fiber fleeces are used, for example, as filter
material for exhaust gases from stationary and mobile
internal combustion engines. They are used in
particular to retain particulates (ash, soot, etc.)
contained in the exhaust gas, these particulates being
at least partially retained by the fiber fleece and
being chemically converted, if appropriate using a
catalyst. On account of the high thermal and dynamic
stresses on the fiber fleeces, in particular in exhaust
systems of mobile internal combustion engines of, for
example, vehicles, boats, etc., particular demands are
imposed on a fiber fleece of this type with regard to
their long-term strength; in particular, permanent
connection of the fibers to one another is necessary.
Fiber fleeces of this type are produced, for example,
by welding or by forming sintered connections between
the wire filaments.
When producing the fleeces, it is necessary to take
into account the fact that under certain circumstances
they also need to be joined to further components in
order ultimately to form an exhaust-gas treatment
device. For this purpose, it is on occasion necessary
for a specific shape to be imparted to the fiber
fleece. However, the desired shaping is impeded by the
connections which have been formed between the fibers,
and consequently considerable difficulties have arisen
in series production with a view to manufacture of

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exhaust-gas treatment units of this type. For example,
additional handling tools of special configuration are
required, and on account of the poor formability of the
smooth fiber fleeces, these tools are also subject to
considerable wear. Moreover, there is a risk of the
fiber fleece tearing uncontrollably at various
locations, in which case under certain circumstances
fibers may subsequently become detached in the exhaust
system.
It is an object of the present invention to at least
partially alleviate the technical problems which have
been outlined in connection with the prior art. In
particular, it is an object to specify a process for
producing a metallic fleece which allows simple series
production even of exhaust-gas treatment units.
Furthermore, it is intended to specify a process for
producing a honeycomb body which involves using a
metallic fleece which can be subjected to accurate
shaping even for series production. Finally, it is also
intended to propose a fleece which makes it easy to
produce honeycomb bodies and apparatuses for exhaust-
gas treatment.
These objects are achieved by the process for producing
a fleece having the features of patent claim 1, the
process for producing a honeycomb body having the
features of patent claim 6 and the fleece having the
features of patent claim 9. Further advantageous
configurations of the invention are described in the
dependent patent claims. It should be noted that the
features listed individually in the patent claims can
be combined with one another in any technologically
appropriate way so as to form further configurations of
the invention.
The process according to the invention for producing a
fleece comprising metallic wire filaments comprises at
least the following steps:

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a) forming a layer comprising wire filaments;
b) producing first cohesive connections between at
least some of the metallic wire filaments using a
first joining process;
c) producing second cohesive connections between
metallic wire filaments using a second joining
process.
A "fleece" is to be understood in particular as meaning
a sheet-like structure in which the wire filaments that
form the fleece can be arranged in ordered fashion or
randomly with respect to one another. Examples of a
fleece include woven fabrics, grid structures, knitted
fabrics, irregular layers, etc. The fleece may in
principle also comprise at least one filler, such as
for example other types of fleeces, powders or the
like, with the latter ultimately being captively
connected to the fleece. The fleece is formed by wire
filaments which comprise a corrosion-resistant material
which is able to withstand high temperatures. The "wire
filament" is a term used to signify in particular an
element of elongate length and in particular also
encompasses elements in wire form, elements in chip
form and similar elements. The metallic wire filaments
in particular comprise a material which substantially
comprises steel as base material, preferably with high
chromium contents (e.g. in a range from 18 to 21% by
weight) and/or aluminum contents (e.g. at least 4.5% by
weight, in particular at least 5.5% by weight). In
principle, aluminized wire filaments can also be used.
These metallic wire filaments are preferably designed
with a filament length in the range from 0.1 to 50 mm
(in particular in a range from 1 to 10 mm) and a
filament diameter in the range from 0.01 to 0.1 mm (in
particular in a range from 0.02 to 0.05 mm). The weight
per unit area of a fleece of this type is preferably in
the range from 750 to 1500 g/m2. The porosity of the
fleece that is to be produced is preferably in a range

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from 3 0% to 80%, in particular in a range from 45% to
60%.
According to step a) , first of all a layer comprising
wire filaments is formed. This is to be understood as
meaning in particular that the wire filaments are
arranged in a loose assembly against and/or on top of
one another. For this purpose, the wire filaments
(random or oriented) are placed, for example, on a
support, so that the wire filaments are in contact with
one another. The layer is formed until a desired layer
thickness, a specified layer weight and/or a desired
porosity is present. The layer therefore represents the
starting component for the fleece, without any cohesive
connections yet being present between the wire
filaments.
In step b) , first cohesive connections are produced
between at least some of the metallic wire filaments
using a first joining process. The first cohesive
connections are designed in such a way that the fleece
can still be readily shaped, in particular can still be
wound helically, wound in a S shape or deformed in a
similar way. It is preferable for the majority of the
metallic wire filaments to have already been connected
to one another by the first joining process, preferably
at least 80% of the wire filaments. Furthermore, it is
preferable for at least some of the metallic wire
filaments to have a plurality of first cohesive
connections to adjacent wire filaments, which should be
the case in particular for at least 40% of the wire
filaments. It is very particularly preferable for step
b) to be executed such that cohesive connections with
regard to a metallic wire filament are formed only in a
subregion of the wire filament which is significantly
smaller than the filament length; by way of example,
these first cohesive connections are formed only in a
subregion amounting to less than 20% (in particular
less than 5%) of the filament length.

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With this type of configuration of the first cohesive
connections, there is only a relatively small or
reduced number of cohesive connections or connection
points stiffening the fleece, so that on the one hand
it is ensured that the fleece is transportable and even
also deformable, but on the other hand the risk of
insufficient anchoring or fixing of a significant
proportion of the wire filaments is avoided. The first
joining process is preferably a joining process
selected from the group consisting of manufacturing
processes relating to joining by welding and joining by
soldering. In principle, it is possible to work with or
without filler.
Then, in a further step c), second cohesive connections
are produced between the metallic wire filaments using
a second joining process. In other words, this means in
particular that the formation of the first and second
cohesive connections takes place locally and temporally
separately. During the second joining process,
additional second cohesive connections or connection
points are generated, which lead to further stiffening
of the fleece. In particular, a first flexural strength
after step b) (maximum force occurring during bending
of the fleece (width: 50 mm) up to a bending angle of
90° with a free bending length of 2 0 mm) is
considerably lower than a second flexural strength
after step c) has been carried out, the second flexural
strength preferably being at least 50%, in particular
100% greater than the first flexural strength. Since
the absolute flexural strength value is dependent on
the specific configuration of the fleece, it is
possible here, purely by way of example (0.3 mm fleece
thickness 0.022 mm filament diameter, 85% porosity), to
specify a value for the flexural strength. The first
flexural strength is in this case in a range from 600
to 12 00 mN and preferably below 1000 mN, whereas after
step c) by way of example a second flexural strength of

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at least 1500 mn is produced. After step c) , it is
preferable for at least 90% of all the wire filaments
to have at least one first and/or at least one second
cohesive connection.
The process proposed here proposes two-stage generation
of the desired fleece property in terms of its
structural integrity. This opens up the possibility of
the fleece first of all being brought into a readily
shapeable state, then being deformed into its final
shape and finally acquiring its ultimately desired
rigidity in a subsequent joining process. This allows,
for example, the production of structured fleeces which
are ultimately able to withstand the high dynamic and
thermal stresses in the exhaust system of mobile
internal combustion engines for a prolonged period of
time.
Furthermore, it is proposed that a welding process be
used as first joining process to carry out step b) . It
is very particularly preferable for resistance welding
processes to be used to form the first cohesive
connections. In this context, what is known as roller
seam welding, in which at least two roller-like
electrodes are arranged on either side of the fleece,
has proven particularly suitable. Applying a voltage to
the electrodes and bringing them into contact with the
wire filament layer leads to the formation of cohesive
connections between the metallic wire filaments. On
account of the spatially delimited zone of action of
the welding process, first cohesive connections are
also generated only in relatively locally limited
subregions of the layer or fleece. This allows the
desired fleece property to be set in a targeted fashion
for further treatment of the fleece.
According to a further configuration of the process, it
is proposed that a high-temperature treatment of the
fleece to form sintered connections be used as second

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joining process to carry out step c). In this case, it
is very particularly preferable for the fleece to be
exposed to a temperature of over 800°C, in particular
over 1100°C. The environment surrounding the fleece can
in this case be realized with a vacuum and/or a
shielding gas atmosphere. The second cohesive
connections are in particular characterized by what are
known as sinter necks, which form as a result of
surface diffusion between the metallic wire filaments.
The second cohesive connections are usually positioned
in the region of contact between adjacently fixed wire
filaments.
According to a further configuration of the process,
step b) comprises forming a connection plan, so that at
least one anisotropic fleece property is produced. An
"anisotropic" configuration of a property is to be
understood in particular as meaning that the extent of
this property differs significantly as seen in
different directions of the fleece. This means, for
example, that the fleece after step b) is flexurally
rigid in one direction and flexurally yielding in
another direction. To achieve this, it is proposed that
a connection plan be formed. A "connection plan" is to
be understood as meaning a predetermined arrangement of
zones of first cohesive connections. This connection
plan may comprise a plurality of zones of first
cohesive connections arranged in a defined way with
respect to one another such that they form a type of
pattern. The connection plan can be formed with a
plurality of zones, at least some of which are parallel
to one another and/or at least some of which cross one
another. The specific configuration of the connection
plan is dependent mainly on the type of deformation of
the fleece which is still desired. The different
configuration of the connection plan allows in
particular the following fleece properties to be made
anisotropic: flexural strength, strength, cold-
formability, tensile strength.

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According to a further configuration of the process, at
least one of the following steps is carried out between
step b) and step c) :
transporting the fleece,
deforming the fleece,
coating the fleece.
During transporting of the fleece, the fleece is, for
example, removed from a support or moved together with
the support to a different location. In this context,
it is also possible for the fleece to be at least
partially elastically deformed, rotated, etc. The
deformation of the fleece comprises, for example, the
introduction of openings, winding of the fleece,
twisting and/or structuring of the fleece. During the
deformation of the fleece, it is preferable to effect a
permanent, plastic deformation of the sheet-like
structure to form a more complex structure, for example
in the manner of a spiral, a cylinder, with a
corrugated or zigzag shape, etc. The coating of the
fleece may comprise the application of a filler, with
this filler being temporarily or permanently fixed to
the fleece. A temporary coating could, for example,
comprise attaching an adhesive for fixing further
components or a powder (solder, filter material, etc.).
One example of a permanent coating is the application
of any additional material comprising at least one
alloying element which is at least partially introduced
into the surface of the fleece, if appropriate at the
same time as step c) is being carried out.
A further aspect of the invention proposes a process
for producing a honeycomb body having at least one
fleece comprising a multiplicity of metallic wire
filaments, which comprises at least the following
steps:
w) forming a layer of wire filaments;

- 9 -
x) producing first cohesive connections between at
least some of the metallic wire filaments using a
first joining process;
y) arranging at least one fleece so as to form a
honeycomb body;
z) producing second cohesive connections between
metallic wire filaments using a second joining
process.
A honeycomb body is characterized in particular by the
fact that it is designed with a multiplicity of
passages, which are usually arranged substantially
parallel to one another and at least some of which a
fluid can flow through. Honeycomb bodies of this type
are used, for example, to remove pollutants from
exhaust gases from mobile internal combustion engines.
The honeycomb bodies serve, for example, as supports
for a catalytically active coating and/or as a
particulate trap. At least one fleece comprising a
multiplicity of metallic wire filaments is provided
here for building up the honeycomb structure. For
details as to the production of the wire filament
fleece (steps w) and x) ) , reference should be made to
the explanations given above in connection with steps
a) and b).
After the first cohesive connections have been
produced, according to step y) the process step of
arranging at least one fleece so as to form a honeycomb
body takes place. This arranging step comprises, for
example, deforming the fleece, aligning the fleece with
respect to further components of the honeycomb body
(such as for example additional sheet-metal foils),
integrating the fleece in a housing, and the like. It
is preferable for step y) to be carried out in such a
way that the desired configuration of the honeycomb
body having the at least one fleece is present, and
finally in step z) the desired long-term strength or
rigidity of the fleece or honeycomb body is realized.

- 10 -
It is in this context particularly advantageous for
step y) to encompass the assembly of the at least one
fleece with other metallic components, and for cohesive
connections also to be formed between at least some of
the components during step z) . Further metallic
components, which may form part of a honeycomb body,
include, for example, a metallic housing, at least one
metal foil (which likewise at least partially delimits
passages) and metallic connection elements which, for
example, allow a plurality of fleeces to be connected
to one another and/or close off at least some of the
passages in the honeycomb body. In connection with step
y) , the intention is in particular the alternate
stacking of a smooth fleece and a corrugated metal
foil, which are then wound and/or intertwined to form a
honeycomb body. This assembly made up of metal foil and
fleece is then inserted into a housing, which takes
place with a prestress which is such that the assembly
made up of fleece and metal foil is temporarily fixed.
In this arrangement of the components with respect to
one another, second cohesive connections are then
formed during step z).
It is in this context also advantageous for step z) to
comprise a soldering process (specifically what is
known as "brazing") carried out at temperatures above
800°C and under vacuum. It is in this context
advantageous for at least subregions of the components
to be provided with a soldering material, which then
forms further cohesive connections between at least
some of the components. Therefore, during step z) , on
the one hand the fleece is stiffened by the formation
of second cohesive connections between the wire
filaments, and at the same time a connection is
produced between the components. The brazing process
described here preferably takes place at temperatures
above 1000°C. This process step also improves the
quality or strength of the connections.

- 11 -
A further aspect of the invention proposes a fleece
having a multiplicity of metallic wire filaments, some
of the wire filaments being cohesively connected to one
another according with a connection plan, so that the
fleece has at least one anisotropic fleece property.
With regard to the anisotropy, reference is made to the
explanations given above. The at least one fleece
property comprises at least one of the following
properties of the fleece: flexural strength, strength,
cold-formability, tensile strength.
The starting point here is in particular that the wire
filaments are arranged randomly with respect to one
another. It is in principle possible for the fleece
also to be formed using oriented or ordered wire
filaments, so that, for example, the arrangement of
these filaments already produces an anisotropy.
Nevertheless, the preferred option here is a fleece in
which the wire filaments are arranged randomly with
respect to one another and the anisotropy has been
produced by specially formed first cohesive
connections. Accordingly, the fleece can be produced in
particular by the above process which has been
described in accordance with the invention.
The invention also proposes a honeycomb body comprising
a plurality of passages, the passages at least
partially being formed by a fleece of the type
described above. In this context, a single fleece is
preferably used to delimit a plurality of passages, and
in the case of a helical structure of the honeycomb
body it is even possible for a single fleece to
partially delimit all the passages at least in part.
The invention also proposes an apparatus for exhaust-
gas treatment, comprising at least one fleece of the
type according to the invention, at least one fleece
produced by a process according to the invention, or at

- 12 -
least one honeycomb body of the type mentioned above.
The exhaust gas to be purified at least partially flows
through this apparatus, with solid particulates at
least in part accumulating in or on the fleece. This
apparatus is preferably designed as a filter or
particulate trap.
Therefore, it is particularly advantageous for a
vehicle comprising an internal combustion engine to be
combined with at least one apparatus of the above type.
The vehicle is preferably a truck or passenger car, in
which case the apparatus is integrated in its exhaust
system. The internal combustion engine is, for example,
a spark-ignition engine or a diesel engine.
The invention and the technical background are
explained in more detail with reference to the figures.
The figures also show particularly preferred exemplary
embodiments of the invention, although without the
invention being restricted to these embodiments. The
figures are diagrammatic in form and in general cannot
serve to illustrate size ratios. In the figures:
Fig. 1 shows a perspective illustration of a first
variant embodiment of a fleece;
Fig. 2 shows a detail view of the fleece from fig.
1;
Fig. 3 shows the sequence of a first fleece
production variant;
Fig. 4 shows a detail view of a honeycomb body with
a fleece;
Fig. 5 shows a further variant embodiment of a
honeycomb body with a fleece; and

- 13 -
Fig. 6 shows a vehicle with an exhaust-gas-treatment
apparatus.
Fig. 1 provides a diagrammatic and perspective
illustration of a fleece 1 which is formed by a
multiplicity of metallic wire filaments 2. The fleece 1
has first cohesive connections 4, which together form a
connection plan 6. In the variant embodiment
illustrated, some of the first cohesive connections 4
are formed as a parallel line, in particular a weld
seam, this connection plan 6 being crossed by a
"zigzag"-like configuration of a further first cohesive
connection 4. If the fleece is considered in a state in
which second cohesive connections 5 have not yet been
generated, the fleece 1 has anisotropic fleece
properties. The anisotropy is configured to be
different in particular in the direction of the fleece
thickness 17 (z direction) or in its plane (x direction
and y direction). It is very particularly preferable
for an anisotropy to be formed with regard to the x and
y directions, so that the fleece 1 is, for example,
flexurally yielding in the x direction and flexurally
rigid in the y direction. The weld seams illustrated
may have a width of up to 100 mm, in which case the
distance between the adjacent weld seams may be
designed to be smaller than the width of the weld
seams. The term weld seam is used to describe a zone
with a high number of cohesive connections, in
particular compared to the layer or fleece before and
after a welding operation.
Figure 2 now shows a detail of the fleece from figure 1
at a time when second cohesive connections 5 have been
formed. The second cohesive connections 5 are
preferably formed as sintered connections which are
produced in contact regions of the wire filaments 2.
The wire filaments 2 advantageously have a filament
length 16 in the range from 1 to 10 mm and a filament
diameter 15 in the range from 0.02 to 0.05 mm. On

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account of the random arrangement of the wire filaments
2 with respect to one another, pores 18 are formed,
allowing the fleece 1 to be gas-permeable. The porosity
of the fleece is in the range from, for example, 45% to
6 0%. After first cohesive connections 4 and second
cohesive connections 5 have been formed, the anisotropy
which was previously present is greatly reduced or no
longer significant. In this context, it should
fundamentally be pointed out that the fleece properties
relate to the actual fleece and not to its assembly
with further components which may influence the
rigidity.
Fig. 3 illustrates a variant embodiment of the process
for producing a fleece 1. Wire filaments 2 are placed
by means of a distributor 19 onto a support 3 5 (if
appropriate designed as a conveyor belt), so as to form
a layer 3 comprising wire filaments 2. When the desired
composition of the layer 3 is present, this loose
assembly of wire filaments 2 is provided, in a further
step, with first cohesive connections by means of a
first joining process, so as to generate a fleece 1. In
the variant embodiment illustrated, the joining process
is carried out by means of a welding installation 20,
with the sketched illustration showing a roller seam
welding process (resistance welding). After the fleece
1 with anisotropic fleece properties has been formed,
it is possible to carry out various further process
steps for producing, for example, a honeycomb body,
before the second cohesive connections 5 are finally
produced in a further process step (illustrated on the
right-hand side of fig. 3) . In the illustration, this
is done by means of a furnace 21 in which, for example,
temperatures of over 1000°C are present, with sintered
connections being formed between the wire filaments 2.
Fig. 4 illustrates a variant embodiment of a honeycomb
body 7 having a fleece 1. The honeycomb body 7 has a
multiplicity of passages 11 through which an exhaust

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gas can flow in a direction of flow 23. The passages 11
are delimited on the one hand by a fleece 1 and on the
other hand by metal foils 9. The metal foils 9 are in
structured form with corrugation peaks 25 and
corrugation valleys 26. Flow-influencing means 24,
which project into inner regions of the passages 11,
are provided for the purpose of influencing the
direction of flow 23 of the exhaust gas and/or of the
particulates 22 contained therein. Therefore, some of
the exhaust gas is diverted toward the fleece 1, with
the particulates 22 accumulating at the wire filaments
2 of the fleece 1.
A further configuration of a honeycomb body 7 as what
is known as a "wall-flow filter" is illustrated in fig.
5. This honeycomb body 7 likewise has a plurality of
passages 11 which are closed on alternate sides. The
passages 11 in turn are at least partially formed by a
fleece 1, it being possible for exhaust gas to enter
inner regions of the honeycomb body 7 in a direction of
flow 23, and this exhaust gas, as a result of the
positioning of connection elements 10 at the end sides
36, being forced to penetrate fully through the fleece
1. To prevent blockages, it is possible to provide
openings 27 in the fleece 1, constituting a type of
bypass, if the fleeces 1, on account of a high level of
accumulated particulates, form an excessively high flow
resistance to the exhaust gas. This honeycomb body 7 is
arranged in a metallic housing 8 and is preferably
soldered to it.
Finally, fig. 6 illustrates a preferred intended use of
the fleece 1 or the honeycomb body 7. This figure
illustrates a motor vehicle 13 having an internal
combustion engine 14. The internal combustion engine 14
generates an exhaust gas which is at least partially
purified by means of the exhaust system 29 illustrated.
For this purpose, the exhaust gas first of all flows
through a primary catalytic converter 28. It then flows

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through an oxidation catalytic converter 3 0 and an
apparatus 12 for exhaust-gas treatment, which is
designed here as a particulate trap 31. The combination
of an oxidation catalytic converter 30 and a
particulate trap 31, by virtue of the provision of
nitrogen oxides, allows continuous regeneration of the
particulate trap 31, so that if appropriate it is
possible to dispense with thermal regeneration, i.e.
burning off of soot constituents. The exhaust gas then
also flows to a muffler 32 before leaving the exhaust
system 29.

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List of designations

1 Fleece
2 Wire filament
3 Layer
4 First connection
5 Second connection
6 Connection plan
7 Honeycomb body
8 Housing
9 Metal foil
10 Connection element
11 Passage
12 Apparatus
13 Vehicle
14 Internal combustion engine
15 Filament diameter
16 Filament length
17 Fleece thickness
18 Pore
19 Distributor
20 Welding installation
21 Furnace
22 Particulate
23 Direction of flow
24 Flow-influencing means
25 Corrugation peak
26 Corrugation valley
27 Opening
28 Primary catalytic converter
29 Exhaust system
30 Oxidation catalytic converter
31 Particulate trap
32 Muffler
33 Width
34 Distance
35 Support
36 End side

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Patent claims
1. A process for producing a fleece (1) comprising
metallic wire filaments (2), using at least the
following steps:
a) forming a layer (3) comprising wire filaments (2) ;
b) producing first cohesive connections (4) between
at least some of the metallic wire filaments (2)
using a first joining process;
c) producing second cohesive connections (5) between
metallic wire filaments (2) using a second joining
process.

2. The process as claimed in claim 1, in which a
welding process is used as first joining process to
carry out step b).
3. The process as claimed in claim 1 or 2, in which a
high-temperature treatment of the fleece (1) to form
sintered connections is used as second joining process
to carry out step c).
4. The process as claimed in one of the preceding
claims, in which step b) comprises forming a connection
plan (6) , so that at least one anisotropic fleece
property is produced.
5. The process as claimed in one of the preceding
claims, in which at least one of the following steps is
carried out between step b) and step c) :
transporting the fleece (1) ,
deforming the fleece (1) ,
coating the fleece (1).
6. A process for producing a honeycomb body (7)
having at least one fleece (1) comprising a
multiplicity of metallic wire filaments (2) , which
comprises at least the following steps:
w) forming a layer (3) of wire filaments (2);

- 19 -
x) producing first cohesive connections (4) between
at least some of the metallic wire filaments (2)
using a first joining process;
y) arranging at least one fleece (1) so as to form a
honeycomb body (7);
z) producing second cohesive connections (5) between
metallic wire filaments (2) using a second joining
process.
7. The process as claimed in claim 6, in which step
y) comprises assembling the at least one fleece (1)
with other metallic components (8, 9, 10) , and during
step z) cohesive connections are formed between at
least some of the components (1, 8, 9, 10) .
8. The process as claimed in claim 6 or 7, in which
step z) comprises a soldering process carried out at
temperatures above 800°C and under vacuum.
9. A fleece (1) having a multiplicity of metallic
wire filaments (2) , some of the wire filaments (2)
being cohesively connected to one another according to
a connection plan (6) , so that the fleece (1) has at
least one anisotropic fleece property.
10. The fleece (1) as claimed in claim 9, in which the
wire filaments (2) are arranged randomly with respect
to one another.
11. A honeycomb body (7) comprising a plurality of
passages (11), the passages (11) at least partially
being formed by the fleece (1) as claimed in claim 9 or
10.
12. An apparatus (12) for exhaust-gas treatment,
comprising at least one fleece (1) as claimed in claim
9 or 10, at least one fleece (1) produced by the
process as claimed in one of claims 1 to 8, or at least
one honeycomb body (7) as claimed in claim 11.
- 20 -
13. A vehicle (13) comprising an internal combustion
engine (14) in combination with at least one apparatus
(12) as claimed in claim 12.


A process for producing a fleece (1) comprising
metallic wire filaments (2), using at least the
following steps:
a) forming a layer (3) comprising wire filaments (2);
b) producing first cohesive connections (4) between at least some of the metallic wire filaments (2) using a first joining process;
c) producing second cohesive connections (5) between metallic wire filaments (2) using a second joining process.
The invention also describes corresponding fleeces and advantageous possible uses, for example in the treatment of exhaust gas from motor vehicles.




Documents:

04666-kolnp-2007-abstract.pdf

04666-kolnp-2007-claims.pdf

04666-kolnp-2007-correspondence others.pdf

04666-kolnp-2007-description complete.pdf

04666-kolnp-2007-drawings.pdf

04666-kolnp-2007-form 1.pdf

04666-kolnp-2007-form 2.pdf

04666-kolnp-2007-form 3.pdf

04666-kolnp-2007-form 5.pdf

04666-kolnp-2007-gpa.pdf

04666-kolnp-2007-international publication.pdf

04666-kolnp-2007-international search report.pdf

04666-kolnp-2007-pct request form.pdf

04666-kolnp-2007-translated copy of priority document.pdf

4666-KOLNP-2007-(15-09-2011)-ABSTRACT.pdf

4666-KOLNP-2007-(15-09-2011)-AMANDED CLAIMS.pdf

4666-KOLNP-2007-(15-09-2011)-DESCRIPTION (COMPLETE).pdf

4666-KOLNP-2007-(15-09-2011)-DRAWINGS.pdf

4666-KOLNP-2007-(15-09-2011)-EXAMINATION REPORT REPLY RECIEVED.PDF

4666-KOLNP-2007-(15-09-2011)-FORM 1.pdf

4666-KOLNP-2007-(15-09-2011)-FORM 2.pdf

4666-KOLNP-2007-(15-09-2011)-FORM 3.pdf

4666-KOLNP-2007-(15-09-2011)-OTHERS.pdf

4666-KOLNP-2007-(15-09-2011)-PETITION UNDER RULE 137.pdf

4666-KOLNP-2007-CORRESPONDENCE OTHERS 1.1.pdf

4666-KOLNP-2007-CORRESPONDENCE OTHERS 1.2.pdf

4666-KOLNP-2007-OTHERS.pdf

4666-KOLNP-2007-PCT REQUEST 1.1.pdf

abstract-04666-kolnp-2007.jpg


Patent Number 250041
Indian Patent Application Number 4666/KOLNP/2007
PG Journal Number 48/2011
Publication Date 02-Dec-2011
Grant Date 30-Nov-2011
Date of Filing 03-Dec-2007
Name of Patentee EMITEC GESELLSCHAFT FUR EMISSIONS-TECHNOLOGIE MBH
Applicant Address HAUPTSTRASSE 128, 53797 LOHMAR
Inventors:
# Inventor's Name Inventor's Address
1 HIRTH, PETER BIRKENWEG 56, 51503 ROSRATH
2 BRUCK, ROLF FROBELSTRASSE 12, 51429 BERGISCH GLADBACH
PCT International Classification Number B23K 31/02,B23K 1/00
PCT International Application Number PCT/EP2006/004483
PCT International Filing date 2006-05-12
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 10 2005 023 385.6 2005-05-17 Germany