DE69819771T2 - BRACKET MATERIAL WITH SURFACE RELIEF - Google Patents

Description

Territory of invention

The present invention relates to an assembly item for use in assembling monolithic Structures for use in pollution control devices. In particular The present invention relates to a flat material with reduced Surface tension, that for assembly and support of monoliths used in pollution control devices be used.

background the invention

Typically, foaming flat materials in pollution control devices for the assembly and support of a fragile monoliths used within a case. typically, the monoliths are made of ceramic, but can also be made of a metal like stainless steel. The housings are typically made also made of a metal and preferably of stainless steel. metal housing usually have coefficients of thermal expansion that much higher than the thermal expansion coefficients of ceramic monoliths are. The foaming flat Materials are positioned between the monolith and the case, to protect the monolith from damage and to prevent the exhaust gases from bypassing the monolith and escaping untreated. Typically, the exhaust gases are from the supported catalysts only treated effectively after reaching the optimum operating temperature. A possibility for shortening the time period required for the monolith and the Catalyst reach the optimal operating temperature is the catalyst closer to shift to the engine, which also leads to higher operating temperatures leads. Because of the higher Operating temperatures require thicker mounting mat materials. The thicker mounting mat holds the housing relatively cool, while they maintain a high temperature gradient across the mounting mat gets what kind of the property of the mounting mat for holding the monolith advantageous is. The types of catalyst monoliths that are typical of these Applications, but have relatively small monolith cross-sections, thereby wrapping the smaller contours of the monolith with the thicker assembly materials without the flat material rips or breaks, becomes difficult.

JP-A-02061313 discloses a structure that of a ceramic honeycomb with many cells inside, one buffer material wrapped around the ceramic honeycomb and that Buffer material-receiving metal container that has an exhaust gas inlet opening the front and the back opposite the ceramic honeycomb lies, includes. The area of the ceramic honeycomb to be touched Buffer material contains many holes and / or recesses.

JP-A-61089916 discloses a sealing mat, made of a heat-resistant fiber such as asbestos, rock wool, ceramic fiber, carbon fiber etc. There are hollow curves on one or both sides of the sealing mat with an optional profile and in an optional number. The formation of means of hollow curves is optional. by virtue of the formation of hollow curves moves on exposure excessive compression part of the convex parts of the surface of the sealing mat to the concave Divide and the compression is reduced. As a result, the probability of breakage of the honeycomb catalyst is extraordinary reduced.

The present invention makes one Mounting item available, to assemble a pollutant control element in the form of a monolithic Structure in one housing a pollutant control device is useful.

The mounting item includes a flat Material with a main top and a main underside, the thickness, width and length of the flat Material are dimensioned so that it is in the longitudinal direction around the pollutant control element is wound and the pollutant control element mounted in the housing and the flat Material at least one bleed line in at least either the Main or the main bottom. The assembly item has at least a cut line that extends in a direction perpendicular to the length over the entire width of the flat Material extends to the tension in at least either the To relieve main top or bottom of the sheet if the sheet material for mounting the pollutant control element in the housing in the longitudinal direction is wrapped around the element.

In a preferred embodiment has the flat Material two bleed lines across the width of the flat Material. In another preferred embodiment it is with the flat Material around a foaming flat Material.

The present invention also provides a pollutant control device that includes a housing, a pollutant control element disposed in the housing, and an assembly of the invention disposed between the pollutant control element and the housing. One of the advantages of the assembly articles of the invention is that the invention uses relatively thicker surfaces materials in pollutant control devices without tearing or breaking the flat material.

The term "gate line" used here means a controlled one and intended discontinuity in an area of the flat Material that is not the entire thickness of a pollutant control element used flat Material penetrates.

The term "foaming" used here flat Material "means a flat Material used to assemble a pollution control element within a housing, that is a foaming Contains material, that swells, foams or expands when there is sufficient thermal energy on it acts, is usable.

The term "non-foaming" used here flat Material "means an essentially inorganic, fibrous sheet material, that is not a foaming Contains material and not about the measure beyond expands that after the inherent thermal expansion coefficient of non-foaming Materials are expected when thermal energy acts on them.

Summary of the drawings

1 Fig. 4 is an exploded perspective view of a catalyst showing the mount of the present invention.

2 is another illustration of the catalyst of 1 in which the assembly of the present invention is shown peeled from the monolith.

3A 10 is a top view of an embodiment of the assembly of the invention, and 3B Fig. 3 is a front view of an oval monolith used in the assembly of Fig 3A is wrapped up.

4A 10 is a top view of an embodiment of the mount of the invention, and 4B Fig. 3 is a front view of an oval monolith used in the assembly of Fig 4A is wrapped up.

5A 10 is a top view of an embodiment of the mount of the invention, and 5B Fig. 3 is a front view of an oval monolith used in the assembly of Fig 5A is wrapped up.

6A is a top view of a sheet material having a plurality of bleed lines, and 6B Fig. 3 is a front view of a round monolith used in the assembly of 6A is wrapped up.

7A is a cross section of a sheet material having a plurality of cut lines, and 7B Fig. 3 is a front view of a round monolith used in the assembly of 7A is wrapped up.

8A Figure 16 is a top view of a sheet material having a plurality of bleed lines on both faces, and 8B Fig. 3 is a front view of a round monolith used in the assembly of 8A is wrapped up.

The 9 and 10 are top views of other embodiments of the assembly of the invention.

11 Figure 3 is a perspective view of a tool for making one embodiment of the assembly articles of the invention.

Full Description of the preferred embodiments

Although the assembly items of the present invention for use in a variety of pollutant control devices such as catalytic converters and diesel particulate filters, elements or traps are suitable, their use here in connection with a Catalyst described. The description is intended for the use of the assembly items of the present invention is illustrative and is not intended to be so be understood that the use of the assembly items on Catalysts is limited.

With reference to the 1 and 2 includes the catalyst 10 a metal case 12 with a usually conical inlet 14 and an outlet 16 , The housing, also known as a capsule or sheath, can be made of suitable materials known in the art for such uses and is typically made of metal. The housing is preferably made 12 made of stainless steel. A monolithic catalyst element 18 , which consists of a honeycomb-shaped, monolithic body made of either ceramic or metal, is located in the housing 12 , Suitable catalytic elements, also known as monoliths, are known in the art and include those made of ceramic or metal. In this embodiment, the cross section of the monolith 18 usually oval and has areas of maximum or greater radius of curvature 19 and areas of minimum or smaller radius of curvature 13 on. The monolith 18 serves to support the catalyst materials for the catalyst. A usable one Monolith is disclosed, for example, in US RE 27 747 (Johnson). A plurality of gas flow channels pass through the monolith 21 , The catalyst materials applied to the catalyst monoliths include those known in the art, for example metals such as ruthenium, osmium, rhodium, iridium, nickel, palladium and platinum and metal oxides such as vanadium pentoxide and titanium dioxide. Useful catalyst coatings are described in greater detail, for example, in U.S. Patent No. 3,441,381 (Keith et al.).

For For the purposes of the invention, the monolith can take any form associated with a flat Material can be wrapped. Examples of such forms include those with the cross section of a circle, an ellipse, a trapezoid, a square, a rectangle, a triangle and a polygon.

The monolith 18 surrounds an object relieving the surface tension 20 , The assembly item 20 comprises a flat material 22 that is used to mount catalysts with surface discontinuities or cut lines 24 in the top 23 of the flat material is usable. The top 23 is the area of the sheet material that is adjacent to the housing when the sheet material 22 is mounted in a catalytic converter. The bottom 25 is the area of the sheet material that is adjacent to the monoliths when the sheet material is mounted in a catalyst.

As in the 3A and 3B the bleed lines extend more clearly 24 attached to the two ends of the sheet material 22 border, in the transverse direction across the width and perpendicular to the length of the sheet material 22 , 3B illustrates a flat material 22 which is an oval shaped monolith 18 surrounds and demonstrates how the bleed lines 24 relieve the surface tension in the blank. In this embodiment, the gate lines are located 24 preferably on the top 23 of the flat material 22 at the point or area of the surface that has the smallest radius of curvature 13 of the monolith corresponds when the sheet material is wrapped around the monolith.

As in 3B you can see the cut lines 24 openings 26 in flat material 22 whose position, depth and width are predictable. Predictable openings are advantageous because they can be considered when designing the housing for the catalyst. For example, because the openings in the sheet materials are predictable, a single catalyst housing design can be used to prevent bypassing the exhaust gases through the predictable openings, and the number of housings can be easily reproduced in the desired number.

The 4A and 5A illustrate other embodiments of the stress relieved mount of the invention. The flat material 22 of 4A has two pairs of bleed lines 24 in the top 23 that correspond to the smallest radius of curvature of the monolith. As in 4B is shown, two predictable openings 26 are formed in the area of the highest tension when the sheet material 22 around an oval-shaped monolith 18 is wrapped. The 5A and 5B show an embodiment of the assembly object of the invention with three pairs of gate lines 24 in the top 23 of the flat material 22 and the resulting predictable openings 26 that are formed after the monolith 18 is wrapped in the sheet material. One of the advantages of a sheet material having a plurality of or more gate lines in areas with a high surface tension is that the length of the sheet material required to wrap a given monolith is increased by each additional gate line that is additionally formed in a surface of the sheet material. is reduced.

The 6A and 6B show an assembly object 20 , comprising a flat material 22 with a plurality of bleed lines 24 on the top 23 of the flat material. As in 6B is shown, results in the majority of the gating lines 24 predictable openings 26 on the surface of the sheet material. A flat material with a plurality of cut lines on the surface of the flat material is preferred for round monoliths with a relatively small diameter.

7A shows an assembly object 30 , comprising a flat material 22 with a plurality of bleed lines 24 by attaching strips 32 from a mounting material on one layer 34 of the flat material so that the stripes 32 abut each other, be formed. The Stripes 32 are attached adjacent to each other so that bleed lines 24 on the surface of the sheet material 22 be formed. The cut lines result in predictable openings in the surface of the flat material 26 after the sheet material as in 7B represented by a round monolith 18 is wrapped. The Stripes 32 can be attached to the sheet of sheet material by sewing, staples, adhesives and the like. The width of the cut lines can be determined by the arrangement of the strips on a layer of the flat material. The Stripes 32 and the layer of sheet material 34 can be made from the same materials as those below for the sheet materials 22 are described. It is also envisaged that the layer of flat material comprises strips of assembly material which adhere to strips in an offset manner in order to form alternating cut lines on both sides of an assembly object.

The 8A and 8B illustrate an assembly object 20 of the invention, which is a flat material 22 with bleed lines 24 covered on both sides of the sheet material. The gate lines 24 on the inside 25 of the flat material 22 preferably have a larger width than the corresponding ones score-lines 24 on the outside 23 of the flat material 22 to allow compression of the inside of the sheet material.

As in the 9 and 10 is illustrated, the gate lines 24 on the surface of the sheet material 22 be present in each pattern as long as the openings created after wrapping a monolith are predictable and do not result in any further undesirable tearing or enlargement of the opening. The gate lines are preferably straight or linear in shape.

The bleed lines can be made via the Latitude or longitude of the flat Material or both can be formed. Preferably extend the gate lines over the entire width of the flat Material.

With the flat material 22 it can be any elastic blank that is suitable for mounting monoliths, filter elements or traps within a housing. The sheet material can include non-foaming materials, foaming materials, or a combination thereof. The structure of the sheet material can be multi-layered, for example two or more relatively thin foaming or non-foaming sheet materials are glued or laminated together to form a uniform, thick sheet material. Useful adhesives include non-woven adhesives and hot melt adhesives. A non-woven adhesive is a preferred adhesive.

Examples of usable non-foaming sheet materials include those made from ceramic fibers. useful ceramic fibers include alumina-boron-silica fibers, Aluminum-silica fibers, Aluminum oxide-phosphorus pentoxide fibers, zirconium dioxide-silicon dioxide fibers, Zirconia-alumina fibers and alumina fibers. Commercially available Fibers include those of the FIBERMAX brands available from Unifrax, SAFFIL LD, available from ICI Chemicals and Polymers, ALCEN alumina fibers available from Denka and MAFTECH fibers are available from Mitsubishi.

The fibers are usually through blow or spinning processes known in the industry. The Fibers are made using various known methods including the Blowing the fibers onto a screen, as is common in the nonwoven industry, formed into a path. Non-foaming sheet materials can also using wet laying or paper making techniques. Not frothing Sheets of ceramic fibers are usually compressed and are kept in the compressed state to facilitate handling during the To facilitate the wrapping process. Compression techniques include the resin bond, the sewing or the vacuum packaging.

The flat material preferably comprises 22 an elastic, pliable, foaming blank comprising about 5 to about 65% by weight of non-foamed vermiculite particles or flakes, such as flakes, which are either untreated or by ion exchange with an ammonia compound such as ammonium dihydrogen phosphate, ammonium carbonate, ammonium chloride or another suitable ammonium compound as described in U.S. Patent No. 4,305,992 (Langer et al.); about 10 to about 60 weight percent inorganic fibers including alumino-silicate fibers, glass fibers, zirconia-silica and crystalline alumina fibers; about 3 to about 25% by weight of an organic binder, for example natural rubber latexes, styrene-butadiene latexes, butadiene-acrylonitrile latexes, latexes of acrylate or methacrylate polymers and copolymers and the like and up to about 40% by weight. % of an inorganic filler such as expanded vermiculite, hollow glass microspheres and bentonite and other clays and the like. Useful foaming sheets also include those described in U.S. Patent No. 5,523,059 (Langer).

More examples of usable ones foaming area Materials include those described in U.S. Patent No. 3 916,057 (Hatch et al.), 4,305,992 (Langer et al.), 4,385,135 (Langer et al.), 5,254,410 (Langer et al.), 4,865,818 (Merry et al.), 5 151,253 (Merry et al.) And 5,290,522 (Rogers et al.) are. Useful commercially available foaming Mats and sheets include those sold under the INTERAM brand by the Minnesota Mining and Manufacturing Company, St. Paul, Minnesota, sold.

The thickness of available single-layer foaming flat Materials typically range from about 0.5 mm to about 15 mm. If two foaming Webs by mechanical means such as an adhesive, staples or sewing and the like are attached to each other, the thickness of the flat materials typically from about 1 mm to about 30 mm. Preferably enough the thickness of the sheet material used in the present invention from about 0.8 mm to about 20 mm, and more preferably from about 6 mm to about 20 mm.

The bleed lines can be formed in or cut into one of the surfaces or both surfaces of the sheet material and are preferably formed in the surface of the foaming sheet material that is adjacent to the housing or the casing of the catalyst, the top. The gate lines are also preferably formed in the surface of the foaming sheet material in such a way that they correspond to the minimum radius of curvature of the monolith. The only restriction on the depth of a gating line located on the surface of the flat material is that the gating line does not go completely through the entire width of the flat material or otherwise up to such a depth may be cut so that when the sheet material is wrapped around the monolith and subjected to a load, the cut line does not tear or propagate completely over the sheet material.

On the other hand, the gate line not so superficial be that the gate line when the sheet material around the monolith is wrapped and subjected to a load, to an unpredictable tearing or an unpredictable magnification, resulting in an undesirable Depth, width or direction of the bleed line leads. The depth of the bleed lines also has a relation to the radius of curvature of the monolith on, which has a direct relationship to the amount of on has the surface tension acting on the blank. With decreasing radius of curvature elevated yourself the height the surface tension in the corresponding area of the cut. The limit of the depth of the Gate lines for any particular end use can be done by a skilled person without undue experimentation be determined.

Preferably, the depth of the gate line range from 20 to about 90% of the thickness of the sheet material. Yet is more preferred the depth of the cut lines is about 50% of the thickness of the flat material.

The width of the bleed lines is not limited, if the flat Material is flat provided the depth and breadth of the resulting Gap or the resulting opening in the area of the flat Material is reproducible if the flat material is a monolith is wrapped. Usable cross-sectional shapes for bleed lines include vertical line, "V" shaped, "U" shaped, triangular and square shapes. Usually the width of the Bleed lines are up to about 20 mm. The width is preferably the gate lines 0 (embossed) up to about 5 mm.

The distance between several neighboring ones Bleed lines hang depending on the specific end use. Hence the distance between cut lines so that the tension on the surface of the Relief is cut without the bleed line undesirably widening or tears, resulting in a predictable opening leads, if the flat Material is wrapped around a monolith. Usually the distance between adjacent cut lines from about 1 mm to about 100 mm, wherein a distance between several adjacent gate lines of approximately 1 mm to about 30 mm is preferred.

The gate lines can be through any of the devices known in the art in the area be shaped or formed. Usable devices for production Bleed lines include cutting, such as punching, and the formation of bleed lines, for example by fastening of spaced strips on a layer of sheet material or through other educational devices.

The cut lines are preferably cut into a surface made of a foaming or non-foaming sheet material by means of any cutting device such as a utility knife, a razor and the like. Even more preferably, the gate lines can be cut into the surface at a predetermined size and shape at the same time as the sheet material is punched out from a large sheet (not shown). In 11 is the matrix 40 with a base plate 42 and one through the border punch 46 defined deepening 44 shown. Inside the recess 44 there are two chamfer punching tools 48 and a foamed ejection material 50 , The border punch 46 and the gate punch tools 48 are usually made of a metal such as steel or stainless steel, and the base plate can be any rigid material such as wood, plastic or metal and the like.

The thickness or height of the gate dies 48 corresponds to the desired depth of the resulting gating lines and is less than the height of the border punch. The different heights of the first punching tool and the border punching tool can be set depending on the thickness of the specially cut flat material. Of course, the length of the sheet material is determined by the circumference of the monolith to be wrapped. The length of the sheet materials of the invention is such that the two ends of the wound blank meet without overlapping and without having a visible gap between the ends.

In use, a sheet of the foaming or non-foaming assembly material is placed on the die 40 positioned, by means of a punch (not shown), pressure is exerted on the flat material, and a mounting object provided with cut lines and punched out can be made due to the foamed and elastic ejection material 50 can be easily removed from the die.

In use, the bleed sheet materials of the invention are placed between the monolith and the housing in a manner similar to that for a catalyst or a diesel particulate filter. This can be done by first wrapping the monolith with an assembly of the invention, ensuring that the gate lines are at the points of the minimum or minimum radius of curvature of the monolith (if the shape of the monolith is not round), such as in the 3 - 5 is shown, the wrapped monolith is inserted into a housing and the housing is then welded or otherwise closed. The sheet materials of the invention preferably have an approach 27 and a recess 29 that interlock, such as in 3A is shown, whereby despite small variations in the size of the monolith a gas seal tion is guaranteed.

The gate lines of the invention represent an economical and simple means of relief the while the wrapping of monoliths occurring surface tension in foaming and not frothing flat Materials represent. The flat Materials of the invention can have any thickness, with the cut lines for thicker (thicker than about 6 mm) and / or less flexible foaming and non-foaming flat Materials have a special use and a special usability. The bleed lines also offer the advantage of using shorter pieces foaming sheet material to allow than would otherwise be possible without bleed lines. This leads to more effective use of raw materials and lower manufacturing costs.

Aims and advantages of this invention are further illustrated by the following examples, where the special materials and their quantities are not interpreted as such may be that they made this invention inadmissible limit. Unless otherwise stated all parts and percentages are by weight.

Examples

Examples 1-3 and Comparative Example C1

Two layers of 685.8 mm x 685.8 mm foaming sheet (INTERAM brand, type 100 mat, 3100 g / m ² , available from Minnesota Mining and Manufacturing Company) were laminated together using a non-woven adhesive to create a sheet was formed with a total thickness of about 9.8 mm. Four cuts of 100 mm × 500 mm were cut with the help of a universal knife. Example 1 was made by cutting with a utility knife across the width of the sample from the foamed blank about half the thickness of the sheet material. Two cut lines, which corresponded to the small radii of the monolith, were cut into the flat material of the sample. Examples 2 and 3 were made as described above, except that they had 2 and 3 bleed lines (4 and 6 in total) for each small radius of curvature of the monolith. Comparative example C1 was a flat material of 100 mm × 500 mm described above without gating lines.

Each of Examples 1, 2 and 3 and Comparative Example C1 were made around a ceramic monolith with the dimensions 3.18 inch (8 cm) (minor axis) x 6.68 inch (17 cm) (major axis) (from Corning, Corning, NY), to the actual Length too determine that to achieve a complete wrapping of the monolith is required. A "complete Wrapping "the monolith for the Purpose of the examples means that the two ends of the wound flat Material meet without overlapping, and there is no visible gap between the ends.

The one for a full wrap length of the monolith required each sample was as follows:

The above data demonstrate that with the foaming flat Materials of the invention for wrapping a monolith less foaming Material than with a flat Material with no surface tension is relieved is required.

Example 4

A sheet material of the invention provided with bleed lines was developed with an in 11 illustrated tool manufactured. The height of the border punch was (above the base plate) 0.5 inch (1.27 cm) and the height of the gate punch (above the base plate) was about 0.302 inch (0.77 cm); the material was steel. The width or dimension of the border punch or the die cut tools were about 0.042 inch (1.07 mm) and 0.028 inch (0.71 mm), respectively. The ejection material was an elastomeric material with a thickness of 0.375 inch (0.95 cm).

A sample of the laminated sheet described above in Examples 1-3 was cut using a ROTOMATIC II punch available from Ampak, Inc., Anderson, SC. The GE Punched and cut line material could be easily removed from the tool without tearing or breaking. The sheet material, which was provided with cut lines, was bent by hand to simulate the wrapping of a monolith. The two cut lines formed cut lines in the flat material with a uniform width and depth and without undesired tearing or expansion.

Example 5 and comparative sample C2

Two foamed mats of the INTERAM brand, type 100, were laminated together with a non-woven adhesive, whereby a flat material with a basis weight of about 6200 g / m ^{2 was} formed. The sheet was made into two sheets of approximately 97 mm x 400 mm to wrap a ceramic oval monolith with a 5 inch (12.7 cm) major axis, a 2.5 inch (6.35 cm) minor axis and one 4.37 inch (11.1 cm) long cut. To cut the monolith was first wrapped with the flat material, and the supernatant was cut off. The monolith was wrapped with the cut flat material C2 (no cut lines), and surface cracks occurred in the areas with the smallest radius of curvature (main axis).

Two bleed lines were created in the other flat Material of 97 mm × 400 mm cut with such a distance that each gate line Areas of the smallest radius of curvature corresponded. The gating lines extended to a depth of about 50% of the depth of the flat Materials and over the entire width of the blank. The flat material was on the suitable length cut and the monolith was wrapped. In the area of the gate lines became even openings observed, with no additional random Tear the surface was to be observed.

Example 6 and Comparative Example C3

Flat materials were like made in Example 5 except that the sheet material of Example 6 on its surface over 8 evenly spaced Bleed lines had. Each of the cut lines extended completely across the width of the sheet material. Any of the above flat Materials were made around a round ceramic monolith with a 2.66 inches (6.76 cm) in diameter and 4 inches (10.2 cm) in length. A random one Crack on the surface the comparison material extended across the width of the sheet material. The flat Material from Example 6 gave uniform openings in the region of the gate lines without an additional random Tear.

Example 7

A web of the foaming The INTERAM assembly line, type 100, was made in nine strips from 4 inch (10.2 cm) x 1 inch (2.54 cm) cut. These strips were foamed onto the surface INTERAM brand assembly track, type 100, 4 inch (10.2 cm) x 9 inch (22.9 cm) Glued (Case Sealing Adhesive, Minnesota Mining and Manufacturing Company) with the stripes touching. The flat material was wrapped around the round monolith as in Example 5 in such a way that the gate lines openings results that pointed away from the monolith. The openings were predictable and even. There were No additional random Cracks observed.

Claims (14)

Mounting object ( 20 ) that is used to install a pollutant control element ( 10 ) in a housing ( 12 ) of a pollutant control device is usable, the assembly object ( 20 ) a flat material with a main upper ( 23 ) and a main underside ( 25 ) and the thickness, width and length of the sheet material ( 22 ) are dimensioned such that it is wound in the longitudinal direction around the pollutant control element and the pollutant control element is mounted in the housing and the flat material has at least one cut line in at least either the main upper ( 23 ) and the main underside ( 25 ), whereby the assembly item ( 20 ) is characterized in that at least one gate line ( 24 ) over the entire width of the flat material ( 22 ) extends in a direction perpendicular to the length so that the tension in at least either the main upper ( 23 ) and the main underside ( 25 ) is reduced or relieved if the flat material ( 22 ) is wrapped in the longitudinal direction around the pollutant control element ( 10 ) in the housing ( 12 ) to assemble. A pollutant control device comprising: a housing ( 12 ); one in the case ( 12 ) arranged pollutant control element ( 10 ) and one between the pollutant control element ( 10 ) and the housing ( 12 ) arranged assembly item ( 20 ), whereby the assembly item ( 20 ) a flat material ( 22 ) with a main top and a bottom, a thickness, a length and a width, the sheet material ( 22 ) in the longitudinal direction around the pollutant control element ( 10 ) is wound, which makes it in the housing ( 12 ) and at least one gate line ( 24 ) has at least either on the main top or the main underside, the pollutant control device being characterized in that at least one gate line ( 24 ) over the entire width of the flat material ( 22 ) extends in a direction perpendicular to the length, so that the tension is reduced or relieved in at least either the main top and the bottom. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the sheet material at least two cut lines ( 24 ) in at least one of the main top and the bottom. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the depth of the at least one gating line ( 24 ) ranges from about 5 to about 90% of the thickness of the sheet material. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the at least one gate line ( 24 ) in the main top of the flat material ( 22 ) is located. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the sheet material ( 22 ) is foaming. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the sheet material ( 22 ) is foaming, at least one gate line ( 24 ) over the entire width of the main top surface of the flat material ( 22 ) and perpendicular to the length of the sheet material ( 22 ) and the depth of the at least one gating line ( 24 ) about 50% of the thickness of the flat material ( 22 ) is. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the sheet material ( 22 ) comprises a flat material layer with a surface which is used to hold strips of the flat material ( 22 ) is suitable, the strips being made of flat material ( 22 ) are arranged side by side on the surface of the flat material layer, whereby the at least one cut line ( 24 ) is obtained. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the at least one gate line ( 24 ) Is U-shaped. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the at least one gate line ( 24 ) has a straight shape. Pollutant control device according to claim 2, wherein the pollutant control element ( 10 ) has a round shape and the flat material ( 22 ) a plurality of gate lines ( 14 ) in the main top, the main top of the housing ( 12 ) is opposite. Pollutant control device according to claim 2, wherein the sheet material ( 22 ) at least one gate line ( 24 ) in the main underside, the main underside of the pollutant control element ( 10 ) is opposite. The pollutant control device according to claim 14, wherein the main underside comprises a plurality of the cut lines ( 24 ) having. Pollutant control device according to claim 2 or assembly object ( 20 ) according to claim 1, wherein the gate line extends over the width of the mounting object ( 20 ) extends, the gate line having a sine wave or a zigzag pattern.