JP2002523261A - Mounting material for pollution control equipment - Google Patents

Abstract

(57) Abstract: Interconnection material elements such as mounting pads and mats that can be manufactured and transported in sheet, strip or roll form. Methods are provided for forming the element and for mounting the pollution control element in a pollution control device.

Description

DETAILED DESCRIPTION OF THE INVENTION

TECHNICAL FIELD The present invention relates to mounting materials for pollution control devices, and more particularly to mats and pads for mounting materials manufactured as interconnecting elements.

BACKGROUND ART Pollution control devices are widely used in automobiles to control air pollution.
Currently, two types of devices are used: catalytic converters and diesel particulate filters or traps. Catalytic converters are generally one or two
With a catalyst applied to one ceramic monolith. Such a monolith is housed in a metal container.

[0003] Ceramic monoliths tend to be fragile and have a coefficient of thermal expansion that is significantly different from the coefficient of thermal expansion of the contained metal container. Therefore, when the ceramic monolith is mounted in the container, it must be able to resist mechanical shock due to shock and vibration and heat shock due to thermal cycling. To avoid damaging the ceramic monolith from mechanical shock, to offset the difference in thermal expansion between the ceramic monolith and the metal housing, and to prevent the passage of gas between the monolith and the housing, the mat Is generally provided between the ceramic monolith and the metal housing.

[0004] Diesel particulate filters comprise a porous ceramic filter, also called a monolith, mounted in a metal container. A mounting mat is generally provided between the monolith and the metal housing.

[0005] Mounting mats for ceramic monoliths are generally die cut from a sheet of mounting material. The mounting material sheet comprises, for example, one or more layers of ceramic fibers and / or intumescent material. Individual mats are die cut and then packaged in boxes. Before mounting the monolith in the metal housing, the individual mats are removed from the box and wrapped around the monolith. The mat is fixed in place by stapling or pasting on tape. Thereafter, each monolith / mat assembly is inserted into the metal housing.

In catalytic converters, pads of mounting material are also used between the outer housing section and the inner spacer. An inner spacer separates the two monoliths mounted within the housing. The mounting material pad is die cut from a sheet of mounting material. The die-cut pads are packaged in a box, removed prior to assembling the catalytic converter housing, and then glued in place in the housing.

Applicants have recognized the need for an improved method of manufacturing and packaging mounting materials, such as pads and mats, such that processing is reduced both during manufacturing of the mounting material and during assembly of the pollution control device. are doing.

SUMMARY OF THE INVENTION This need is satisfied by the present invention in which a plurality of mounting elements, such as pads or mats, are manufactured as interconnecting elements. The elements can be manufactured and transported in strip, sheet or roll form. The interconnect elements allow for easy handling during packaging and assembly, reducing packaging costs.

According to a first aspect of the present invention, there is provided a mounting material laminate comprising an adhesive layer, a release liner, and a mounting material layer. The release liner releasably adheres the adhesive layer thereto. The mounting material layer has an adhesive layer adhered to one side thereof. Two or more portions of the mounting material layer and corresponding portions of the adhesive layer define two or more mounting laminate sections. The two or more sections can be separated from each other and from the release liner. Each of these sections is preferably used to mount a pollution control element in a pollution control device.

According to a second aspect of the present invention, there is provided a method of mounting a pollution control element on a pollution control device. The method includes providing a mounting material laminate comprising an adhesive layer, a release liner for releasably adhering the adhesive layer, and a mounting material layer for adhering the adhesive layer to one surface. Two or more portions of the mounting material layer and corresponding portions of the adhesive layer define two or more mounting laminate sections. This method uses 1
Separating one mounting laminate section from the other mounting laminate section and separating from the release liner, providing a housing, providing a contamination control element, and removing a portion of one mounting laminate section. The method further includes bonding the one mounting laminate section to one of the housing and the pollution control element using the portion of the adhesive layer to be formed, and positioning the pollution control element within the housing.

[0011] According to a third aspect of the present invention, there is provided a method of forming a mounting material laminate.
The method includes the steps of providing a release liner, an adhesive layer, and a mounting material layer, and connecting the release liner and the mounting material layer via the adhesive layer, wherein two or more of the mounting material layers Causing the portions and corresponding portions of the adhesive layer to define two or more mounting laminate sections; and forming a line of weakness between adjacent mounting laminate sections. Each of the sections can be separated from the other sections and the release liner along the line of weakness, and each of the sections is suitably used to mount a contamination control element in a contamination control device.

According to a fourth aspect of the present invention, there is provided a mounting material structure comprising a mounting material layer having two or more portions defining two or more mounting sections. Each of these sections can be separated from the other sections along the line of weakness and is preferably used to mount a pollution control element in a pollution control device. The mounting material layer can have an adhesive on one side. In addition, the mounting material layer has a release material (
That is, a material which can easily remove the adhesive) can be provided.

According to a fifth aspect of the present invention, there is provided a mounting material element (ie, mat or pad) comprising a mounting material layer having two sides. An adhesive is disposed on one side of the mounting material layer and a release material is disposed on the other side.

The objects, features and advantages of the present invention will become apparent by consideration of the detailed description and accompanying drawings.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS. 1 and 2, a mounting material laminate 10 is shown. The laminate 10 includes a mounting material layer 20, a release liner 30, and an adhesive layer 40 (shown in FIG. 2 but not shown in FIG. 1). Adhesive layer 40 is adhered to one side 42 of mounting material layer 20 and is releasably adhered to release liner 30. The plurality of portions 22 of the mounting material layer 20 and the corresponding portions of the adhesive layer 40 form a plurality of mounting laminate sections 50. Adjacent sections 50 are separated from one another by weakening lines 52 and can be separated from one another along these lines 52. Section 50 can also be separated from release liner 30.

The mounting material layer 20 comprises one or more layers of a ceramic material and / or an intumescent material, or any other material suitable for mounting a pollution control element in a pollution control device. Examples of mounting materials are disclosed in U.S. Patent Nos. 3,916,057 and 5,380,580, the disclosures of which are incorporated herein by reference. The present invention is not intended to be limited to any particular type of mounting material layer. Layer 20 may have a thickness T _M of about 0.040 inches (1.0 mm) to about 0.6 inches (15.0 mm).

In the illustrated embodiment, the tape 32 is formed by combining the release liner 30 and the adhesive layer 40. Tape 32 is applied to mounting material layer 20 before cutting laminate 10 into a plurality of strips or sheets. The tape 32 is available from 3M Company as "High Adhesive Transfer Tape 927 (High Tack Adh)
active Transfer Tape No. 927) ". The 3M tape has a release liner with a silicone coated paper substrate and an adhesive layer with a layer of acrylic pressure sensitive adhesive.
The paper substrate has a thickness of about 0.004 inches and the adhesive layer has a thickness of about 0.002 inches. The adhesive layer is releasably adhered to the paper substrate. Adhesive layer 40 can also include a film having a layer of pressure sensitive adhesive on both sides. Other release liners and adhesive layers not explicitly discussed herein may be used in place of those described above. Further, the particular thickness of the adhesive layer and the thickness of the release liner may vary from the dimensions described above for the tape used in the illustrated embodiment.
The tape 32 can also have a width that is less than the width of the mounting material layer 20, such that the tape covers only a portion of one side of the layer 20. For example, one or more tapes 32
May be applied to a mounting material layer 20 having a width of about 2 inches to about 10 inches. In the illustrated embodiment, the width of the tape 32 is
Is approximately equal to the width of

The mounting material layer 20 or a separate mounting material element (ie, mat or pad) includes an adhesive applied to one side 42 and a release material (eg, a silicone material or the like) applied to the other side 44. Can also be provided. In this way, the release liner can be eliminated. Such a mounting structure can be rolled up without the separate release liner, with the adhesive side in contact with the release material side. The wound mounting material structure can then be unwound and the desired number of mounting sections removed and each mounting section used to mount the contamination control element. For example, when the mounting sections are mounting mats, each mounting mat can be wrapped around the pollution control element such that the adhesive adheres the mounting mat to the pollution control element. At this time, the release material surface of the wound mounting mat is exposed. If a low friction release material is used, the resulting wraparound contamination control element can be easily inserted into the housing of the contamination control device. Instead of being rolled, the mounting structure without the release liner can be in the form of a strip or sheet. At this time, a plurality of strips or sheets can be stacked one by one such that the adhesive surface of each strip or sheet is in contact with the release material surface of another strip or sheet. Alternatively, separate mounting material elements (ie, mats or pads) with adhesive on one side and release material on the other side can be similarly stacked.

The adhesive layer 40 located on one side 42 of the mounting material layer 20 may include, for example, a patterned hot melt adhesive, a microsphere adhesive, and any other repositionable adhesive known to those skilled in the art. It can be a repositionable adhesive. When using a repositionable adhesive, a primer is often used to secure the repositionable adhesive to the desired substrate (here, the mounting material layer 20). If a repositionable adhesive is used, release liner 30 can be optional. When a release liner is not used, it is desirable to apply a release material such as a low adhesive back size (LAB) to the other surface 44 of the mounting material layer 20. This layer of mounting material 20 can be rolled up such that the repositionable adhesive on one side 42 contacts the release material on the other side 44. The release material allows the roll of the mounting material layer 20 to be more easily unwound. Strips or sheets of layer 20, or individual mats or pads of mounting material, also with or without any release material, such that the repositionable adhesive on one side 42 contacts the other side 44, Can be stacked one by one.

The weakening line 52 can be constituted by a line having at least one hole, a score line or an embossed line. As used herein, the term "scoring line" or "scored portion" refers to a cutting line or portion that extends only part way through the thickness of the material. As used herein, the term "embossed line" or "embossed portion" refers to a fold line or fold without a cut in the material, which can be formed by a blunt edge (not shown) of a die rule. Further, the weakening line 52 is formed by the perforated first
And a second portion that is engraved or embossed. Within a single line of weakness 52, any combination of perforated, inscribed, and embossed portions is possible.

In the embodiment of FIG. 2, each weakening line 52 comprises a perforated line 53. Perforated wire 5
3 is formed by the die rule 60. Die rule 60
Notched blade 62 with two teeth 64a-64c and two side blades 66
And Alternatively, the notched blades 62 may be two or four spaced apart.
It may have one or more teeth. Side blades 66 extend laterally with respect to notched blade 62. Blades 62 and 66 are mounted on wooden die board 6
8 and a wooden die board is mounted on a reciprocating member of a press machine (not shown). The teeth 64 a-64 c of the blade 62 completely cut the sections of the mounting material layer 20, the adhesive layer 40 and the release liner 30 to form three holes 53 a in the laminate 10. The side blades 66 completely cut the laminate 10 to form the separation lines 54 in the laminate 10. After penetrating the laminate 10, the blades 62 and 66 engage a polymer sheet (not shown), such as a 0.25 inch polypropylene sheet, located below the laminate 10. The uncut portions of the mounting material layer 20 and the adhesive layer 40 leave adjacent sections 50 interconnected until they are separated from each other and from the release liner 30 during the assembly operation. The non-cut portions of the release liner 30, along with the non-cut portions of the mounting material layer 20 and the adhesive layer 40, convert the plurality of sections 10a of the laminate 10 into a strip form until the sections 50 are required. Leave interconnected to maintain. The particular width W of the uncut portions 10b of the laminate 10 and the number of uncut portions 10b will keep the sections 50 interconnected until the sections 50 need to be separated from each other and from the release liner 30. It is preferable to select

Although not shown in FIG. 2, the die rule 60 includes a plurality of notched blades 62.
And three or more side blades 66. Blades 62 and 66 cut laminate 10 into a plurality of discrete strips 100 of a plurality of interconnect sections 50. Here, each section 50 is positioned end to end with at least one other section 50, as shown in FIG. As shown in FIG. 1, the strip 100 is formed by rolling the strip 100 into a roll.
It can also be wound around the feeding roll 110. The die rule 60 may also have a plurality of notched blades 62 and three or four notched side blades (not shown). The notched side blades generate a plurality of separation lines 540 consisting of weakened lines, as shown in FIG. Thus, the notched blades 62 and the notched side blades can cut the laminate 10 into a sheet 102 of a plurality of interconnect strips 100, each strip 100 having a plurality of interconnect sections 50. In the embodiment of FIG. 4, each section 50 is positioned side by side with at least one other section 50 and positioned end to end with at least one further section 50. The sheet 102 is fed from a feeding roll 1 so that the sheet 102 is in a roll form.
It can also be wound around 10.

FIGS. 5 and 6 show a die rule 160 formed according to a second embodiment of the present invention. The same elements have the same reference characters. In this embodiment, the die rule 160 includes at least one sawtooth blade 1 having a plurality of teeth 164.
62 and two or more side blades (not shown). The side blades
Made similar to blade 66 and extending at approximately a 90 degree angle to serrated blade 162. The serrated blades and side blades are mounted on a wooden die board 68, which is mounted on a reciprocating member of a press machine (not shown). In the illustrated embodiment, the plurality of teeth 164 are configured to cut the mounting material layer 20 almost completely, thereby forming a perforated wire in the layer 20. The teeth 164 also form a plurality of holes in the adhesive layer 40 and the release liner 30. The side blades completely cut the laminate 10 to form separation lines 54 in the laminate 10. Alternatively, the side blades may be notched or serrated. Notched or serrated side blades form a plurality of separation weakening lines 540 in the laminate 10 to form one or more interconnect strips 100. After the serrated blades and the side blades have penetrated the laminate 10,
Engage with a polymer sheet (not shown) such as a 5 inch polypropylene sheet.
The plurality of teeth 164 can also be formed such that they only cut through the mounting material layer 20, while only cutting through the porosity of the adhesive layer 10 and release liner 30.

FIGS. 7 and 8 show a die rule 260 formed according to a third embodiment of the present invention. The same elements have the same reference characters. In this embodiment, die rule 260 comprises a plurality of first serrated blades 262 and second serrated side blades (not shown). The first and second blades form a plurality of perforated wires 252 in the mounting material layer 200 to define a plurality of mounting sections 270, as shown in FIG. Each section 270 is provided with a tab 272 at one end and a tab receiving notch 274 at the opposite end. Layer 200 is preferably formed from the same material as layer 20 described above. The second lateral blade has a
00 may be cut completely to separate layer 200 into a plurality of separate strips of mounting section 270.

FIGS. 10 and 11 show a die rule 360 formed according to a fourth embodiment of the present invention. The same elements have the same reference characters. In this embodiment, die rule 360 comprises a plurality of first blades 362 and second side blades (not shown). Each of the first and second blades includes a mounting material layer 30.
In order to form a plurality of scribe lines 351 at zero, a substantially straight blade edge 362a is provided.
The score line 351 defines a plurality of mounting sections 370, which have a similar shape to the mounting section 270 shown in FIG. The second side blade is a layer 3
00 may be cut completely to separate layer 300 into a plurality of discrete strips of mounting section 370.

The plurality of mounting laminate sections 50 can form a plurality of mounting material pads 350, and the plurality of mounting sections 270, 370 can form a plurality of mounting material mats 352. The pads 350 and mats 352 are intended for use in mounting a pollution control element on a pollution control device. The pad 350 is preferably formed from a ceramic material. Mat 352 is preferably formed from one or more layers of a ceramic material and / or an intumescent material.

Referring to FIG. 12, the housing 300 of the catalytic converter 310 is shown.
The housing 300 includes first and second outer casing sections 302, 30
4 and first and second inner spacers 306 and 308. Sections 302, 304 and spacers 306, 308 are preferably formed from a metal such as stainless steel. Between the first outer casing section 302 and the first spacer 306, there are first, second and third mounting material pads 350a-35
0c is positioned. Between the second outer casing section 304 and the second spacer 308, there are fourth, fifth and sixth mounting material pads 350d-350
f is positioned. Pads 350a-350f help maintain thermal form of energy within catalytic converter housing 300. Spacers 306, 308 can be welded or otherwise connected to outer casing sections 302, 304.

The catalytic converter 310 further includes two conventional ceramic monoliths 330, 332, as shown in FIG. In FIG. 11, the second casing section 304 is not shown. Each of the monoliths 330, 332 is surrounded by a mounting material mat 352. Each mat 352 has a tab 372 at one end that is received in a notch 374 located at the opposite end of the mat 352. Mat 3
52 acts to rigidly but resiliently support the monoliths 330, 332 in the connected casing sections 302, 304 by the in-situ expansion of the mounting material.

[0029] The catalytic converter 310 is assembled as follows. The section 50a shown in FIG. 1 can constitute the pads 350b and 350e, and
0b can constitute pads 350a, 350c, 350d and 350f. Pads 350a-350f are removed from release liner 30 and
6, 308 are adhesively fixed. As shown in FIG. 1, release liner 30 includes first and second substantially flat portions 112a, 112 extending generally transversely to each other.
Preferably, it passes over the plate 112 with b. Those flat portions 112a
, 112b form a sharp edge 112c. Release liner 3
5 is wound around a take-up roll 114 following the outer surface of the plate 112. The release liner 30 is more easily separated from the laminate section 50 as it passes through the sharp edge 112c, thereby allowing the operator to remove the section 50 from the release liner 3.
0 can be easily removed.

[0030] Spacers 306, 308 having bonded pads 350a-350f can be welded or otherwise connected to casing sections 302, 304. The plurality of mats 352 are separated from each other along the perforated line 252 or the score line 351. They are then wrapped around the monoliths 330, 332 and secured in place, such as by stapling or tape over. Surrounding monolith 330,
332 is then inserted into first casing section 302. Then the second
Of casing sections 304 are combined with the first section 302 and are welded or otherwise connected to the first section 304.

A plurality of mats 352 can also be formed from the laminate 10 such that they have an adhesive layer that allows them to adhere themselves directly to the monoliths 330, 332. Further, pad 350 may be formed without an adhesive layer.

Also, the first end of the release liner 30 of each laminate strip 100 has a tab (not shown) that allows an operator to easily separate the release liner from the first laminate section 50 of the strip 100. It can also extend beyond the mounting material layer 20 to form.

Further, the weakening line may be formed by a die rule that first penetrates the release liner 30 and the adhesive layer 40 before penetrating the mounting material layer 20. Accordingly, the weakening line is formed such that a perforated line or score line is formed in the mounting material layer 20.
The release liner 30 and the adhesive layer 40 are completely cut and the mounting material layer 20 is cut.
May be formed by cutting only partially.

In addition, the mat 352 may include a diesel particulate filter or a monolith used between the metal layers of the return wall end cone that can be used in a catalytic converter.
It can also be used to cover other pollution control elements. When used for end cone applications, the mat 352 is used for insulation and not for mounting purposes. Therefore, the present invention is applicable to any purpose of use in a pollution control device (for example, for insulation).
Can be applied to providing such a material layer.

[Brief description of the drawings]

FIG. 1 is a perspective view of a roll-shaped laminate.

FIG. 2 is a perspective view of a die rule formed according to a first embodiment of the present invention, with a portion of the rule removed.

FIG. 3 is a plan view of a portion of a laminate cut into a plurality of discrete strips.

FIG. 4 is a plan view of a portion of a laminate cut into a plurality of interconnected strips.

FIG. 5 is an enlarged view of a portion of a die rule formed according to a second embodiment of the present invention, with a portion of the rule removed.

FIG. 6 is a view taken along section line 6-6 in FIG. 5;

FIG. 7 is an enlarged view of a portion of a die rule formed according to a third embodiment of the present invention, with a portion of the rule removed.

FIG. 8 is a view taken along section line 8-8 of FIG. 7;

FIG. 9 is a plan view of a portion of a mounting material layer separated into a plurality of interconnected mounting sections.

FIG. 10 is an enlarged view of a portion of a die rule formed according to a fourth embodiment of the present invention, with a portion of the rule removed.

FIG. 11 is a view taken along section line 11-11 of FIG. 10;

FIG. 12 is an exploded view of a catalytic converter housing.

FIG. 13 is a plan view of the catalytic converter with the second outer casing section removed.

──────────────────────────────────────────────────続 き Continuation of front page (81) Designated country EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE ), OA (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, GM, KE, LS, MW, SD, SZ, UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE , KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, UZ, VN, YU, ZWF Term (reference) 3J103 AA02 AA21 BA43 EA07 FA15 FA17 GA02 GA32 HA03 HA47 HA51 4F100 BA03 BA07 BA10A DC13A DC22A GB32 GB56 JL05 JL11B JL14C 4J004 AA10 AB01 CA04 CB02 CC06 CC07 DA04 DB02 EA01 EA05 FA08 GA03

Claims (31)

[Claims] 1. An adhesive layer, a release liner for releasably adhering the adhesive layer, and a material layer for adhering the adhesive layer to one surface, wherein two or more portions of the material layer And a corresponding portion of the adhesive layer defines two or more laminate sections;
And wherein the two or more sections are separable from each other and from the release liner, each of the sections comprising a layer of material suitable for use in a pollution control device. 2. The material laminate according to claim 1, wherein the laminate is in the form of a strip in which the two or more sections are positioned end to end. 3. The material laminate according to claim 1, wherein the laminate is in the form of a sheet in which the two or more sections are positioned at least next to one another. 4. The material laminate according to claim 1, wherein the laminate is in the form of a roll. 5. The material laminate of claim 1, wherein adjacent ones of said two or more laminate sections can be easily separated from one another along a line of weakness. 6. The material stack according to claim 5, wherein the weakening line comprises a line having at least one hole formed through the material layer. 7. The material laminate of claim 1, wherein adjacent ones of said portions of said material layer can be easily separated from one another along a line having one or more holes. 8. The material laminate according to claim 7, wherein adjacent ones of said portions of said adhesive layer can be easily separated from one another along a line having one or more holes. 9. The material laminate according to claim 1, wherein adjacent portions of the release liner corresponding to the laminate sections are partially separated from one another by weakening lines. 10. The material laminate according to claim 1, wherein each of said laminate sections is in the form of a mounting pad adapted to be positioned between an outer casing section of a pollution control device and a spacer element. 11. The material laminate according to claim 1, wherein each of said laminate sections is in the form of a mounting mat adapted to be wrapped around a pollution control element. 12. A method for mounting a pollution control element on a pollution control device, comprising: an adhesive layer, a release liner for releasably bonding the adhesive layer, and bonding the adhesive layer to one surface. Providing a material stack comprising a material layer, wherein two or more portions of the material layer and a corresponding portion of the adhesive layer define two or more laminate sections. Separating the one laminate section from the other laminate section and from the release liner; providing a housing; providing a contamination control element; Bonding said one laminate section to one of said housing and said pollution control element using said portion of said adhesive layer forming part; Positioning the pollution control element in the housing. 13. The method of claim 12, wherein said pollution control element comprises a monolith. 14. The step of providing a housing includes the steps of providing first and second outer casing sections and at least one spacer, wherein the bonding step includes attaching the one laminate section to the first laminate section. And bonding to one of the second outer casing section and the spacer.
2. The method according to 2. 15. The method of claim 12, wherein said one laminate section comprises a mounting mat adapted to be wrapped around said pollution control element. 16. A method for forming a material laminate, comprising: providing a release liner, an adhesive layer, and a material layer; and connecting the release liner and the material layer via the adhesive layer. Causing two or more portions of the material layer and a corresponding portion of the adhesive layer to define two or more laminate sections; and a line of weakness between adjacent laminate sections. Forming each of the sections along a line of weakness from the other of the sections and the release liner, and attaching each of the sections to a contamination control element within a contamination control device. Making it suitable for use in insulation. 17. The method of claim 16, wherein each of said laminate sections is in the form of a mounting pad adapted to be positioned between an outer casing section of said pollution control device and a spacer element. 18. The method of claim 16, wherein each of said laminate sections is in the form of a mounting mat adapted to be wrapped around said pollution control element. 19. A contamination control device, comprising a layer of material having two or more portions defining two or more sections, each of said sections being separable from another of said sections along a line of weakness. Material structure suitable for use in mounting or isolating pollution control elements in buildings. 20. The material structure of claim 19, wherein the material structure is in the form of a strip in which the two or more sections are positioned end to end. 21. The material structure according to claim 19, wherein the material structure is in the form of a sheet in which the two or more sections are positioned at least side by side with one another. 22. The material structure according to claim 19, wherein said material structure is in the form of a roll. 23. The material structure according to claim 19, wherein said weakening line comprises a line having at least one hole. 24. The material structure of claim 19, wherein said weakening line comprises a score line. 25. The material structure according to claim 19, wherein said material layer comprises an intumescent material. 26. The material structure of claim 19, wherein each of said sections is in the form of a mounting pad adapted to be positioned between an outer casing section of a pollution control device and a spacer element. 27. The material structure of claim 19, wherein each of said sections is in the form of a mounting mat adapted to be wrapped around a pollution control element. 28. The material layer having an adhesive on one side thereof.
Material structure as described. 29. The material layer having a release material on the other side.
8. The material structure according to 8. 30. A material element comprising a layer of material having two sides, having an adhesive on one side and a release material on the other side, wherein the material is in a pollution control device. Material element suitable for use or insulation of the element. 31. A material structure comprising a plurality of material elements separable from each other, each element comprising a layer of material having both sides, comprising a repositionable adhesive on one side, said material comprising: Material structure suitable for use or insulation of a pollution control element in a pollution control device.