EP0244964B1 - Manufacture of flexible intumescent sheet - Google Patents
Manufacture of flexible intumescent sheet Download PDFInfo
- Publication number
- EP0244964B1 EP0244964B1 EP87303189A EP87303189A EP0244964B1 EP 0244964 B1 EP0244964 B1 EP 0244964B1 EP 87303189 A EP87303189 A EP 87303189A EP 87303189 A EP87303189 A EP 87303189A EP 0244964 B1 EP0244964 B1 EP 0244964B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheet
- manufacture
- flexible intumescent
- fibrous material
- intumescent sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000002657 fibrous material Substances 0.000 claims abstract description 4
- 239000011230 binding agent Substances 0.000 claims abstract description 3
- 238000004804 winding Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 5
- 239000007900 aqueous suspension Substances 0.000 claims description 4
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052902 vermiculite Inorganic materials 0.000 claims description 3
- 239000010455 vermiculite Substances 0.000 claims description 3
- 235000019354 vermiculite Nutrition 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 2
- 239000000835 fiber Substances 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 6
- 239000011707 mineral Substances 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 3
- 230000002028 premature Effects 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920013646 Hycar Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical compound C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
- F01N3/2857—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing the mats or gaskets being at least partially made of intumescent material, e.g. unexpanded vermiculite
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F13/00—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production
- D21F13/04—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production on cylinder board machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/40—Inorganic fibres or flakes siliceous vitreous, e.g. mineral wool, glass fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
- D21H13/44—Flakes, e.g. mica, vermiculite
Definitions
- This invention relates to the manufacture of flexible intumescent sheet.
- intumescent sheet comprising heat-expandable micaceous mineral, such as vermiculite; inorganic fibrous material, for example refractory aluminosilicate fibres, rockwool or glass fibres; and organic binder, such as natural rubber, styrene-butadiene rubber, butadiene-acrylonitrile rubber, or other elastomeric material.
- the sheet is suitable for use as a mounting for ceramic catalyst-supports in metal containers, particularly in automobile exhaust systems.
- the sheet is of dry bulk density at least 0.5 gm/ml and is typically of thickness 2.5 mm.
- aqueous suspension of vermiculite ore 70 parts by weight
- aluminosilicate fibres sold under the name FIBERFRAX (20 parts by weight)
- styrene-butadiene latex sold under the name HYCAR (equivalent to 10 parts by weight solids)
- FIBERFRAX aluminosilicate fibres sold under the name FIBERFRAX
- HYCAR styrene-butadiene latex
- the slurry is distributed from the head box over the width of the water-permeable conveyor felt of the machine and is progressively de-watered as it travels on the felt. From the felt, the de-watered layer is passed to the drum (or ′making roll′) of the machine, on which it is wound until a thickness of 5 mm has been built up.
- the hollow laminar cylinder formed is then slit axially, and the sheet thus released is laid flat and dried to moisture content of about 2% by weight.
- operation of the drum can be continued until a thickness of 10 mm or more has been built up.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Laminated Bodies (AREA)
- Paper (AREA)
- Catalysts (AREA)
- Bedding Items (AREA)
- Building Environments (AREA)
- Making Paper Articles (AREA)
- Materials For Medical Uses (AREA)
Abstract
Flexible intumescent sheet according to British patent 1 513 808, comprising heat-expandable micaceous mineral, inorganic fibrous material and organic binder, is made on standard board-making machinery incorporating a winding drum, so that a laminar product is obtained, not a monolithic one. The mineral particles in the sheet are thus more uniformly distributed across its thickness, and the product shows less tendency to premature failure in use.
Description
- This invention relates to the manufacture of flexible intumescent sheet.
- In the specification of British patent 1 513 808 published June 1978 there is described flexible intumescent sheet comprising heat-expandable micaceous mineral, such as vermiculite; inorganic fibrous material, for example refractory aluminosilicate fibres, rockwool or glass fibres; and organic binder, such as natural rubber, styrene-butadiene rubber, butadiene-acrylonitrile rubber, or other elastomeric material. The sheet is suitable for use as a mounting for ceramic catalyst-supports in metal containers, particularly in automobile exhaust systems. The sheet is of dry bulk density at least 0.5 gm/ml and is typically of thickness 2.5 mm. In the manufacture of it a standard paper-making technique is employed, in which an aqueous suspension of the ingredients is de-watered as a layer on a Fourdrinier screen, and the resulting green sheet is compressed to a bulk dry density of 0,5 gm/ml or more, and dried at about 90°C to give the final paper. Now, although precautions may be taken to attain substantially uniform distribution of the solid particles of the aqueous suspension across the thickness of the paper, yet it is a matter of great difficulty to ensure this when forming paper of thickness above 2.5 mm. What happens is that the particles, especially those of the micaceous mineral, tend to concentrate at that surface of the layer undergoing dewatering which is adjacent to the Fourdrinier screen. A consequence of this lack of uniformity in distribution of the heat-expandable micaceous mineral is that, when the product is used as a mounting for ceramic catalyst supports in automobile exhaust systems, non-uniform expansion of it occurs and there is a tendency (through the strains which are then set up) for premature failure of the mounting to occur.
- We have now found that this tendency to non-uniform distribution of the mineral is much reduced if the dewatered sheet is wound onto a drum so as to obtain a laminar product (as in standard board making techniques) instead of forming it (as in paper making techniques) to its desired thickness as a monolithic product.
- The invention is further illustrated by the following Example:
- An aqueous suspension of vermiculite ore (70 parts by weight), aluminosilicate fibres sold under the name FIBERFRAX (20 parts by weight) and styrene-butadiene latex sold under the name HYCAR (equivalent to 10 parts by weight solids) is prepared as in Example 1 of British patent specification 1 513 808, and to it is added alum solution to reduce the pH to 4.5. The suspension is then pumped to the head box (flow box) of a standard board making machine ("intermittent machine"), generally as described on page 291, Chapter 12, of "Paper and Board Manufacture" by Julius Grant, James H Young and Barry G Watson (publishers: Technical Division, the British Paper and Board Industiy Federation, London 1978). The slurry is distributed from the head box over the width of the water-permeable conveyor felt of the machine and is progressively de-watered as it travels on the felt. From the felt, the de-watered layer is passed to the drum (or ′making roll′) of the machine, on which it is wound until a thickness of 5 mm has been built up. The hollow laminar cylinder formed is then slit axially, and the sheet thus released is laid flat and dried to moisture content of about 2% by weight.
- If desired, operation of the drum can be continued until a thickness of 10 mm or more has been built up.
Claims (2)
1. A process for the manufacture of flexible intumescent sheet for use as a mounting for ceramic catalyst supports in automobile exhaust systems, by dewatering a layer of aqueous suspension comprising heat-expandable vermiculite ore, inorganic fibrous material, and organic binder, and drying the dewatered layer to a sheet of bulk dry density at least 0.5 gm/ml, characterised by winding the dewatered layer onto a drum so as to obtain a laminar product of thickness greater than 2.5 mm, and then drying the laminar product.
2. A process according to claim 1, in which the inorganic fibrous material is refractory aluminosilicate fibre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87303189T ATE62282T1 (en) | 1986-05-09 | 1987-04-13 | MANUFACTURE OF A FLEXIBLE INFLATABLE CARDBOARD. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8611317 | 1986-05-09 | ||
| GB868611317A GB8611317D0 (en) | 1986-05-09 | 1986-05-09 | Flexible intumescent sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0244964A1 EP0244964A1 (en) | 1987-11-11 |
| EP0244964B1 true EP0244964B1 (en) | 1991-04-03 |
Family
ID=10597569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87303189A Expired - Lifetime EP0244964B1 (en) | 1986-05-09 | 1987-04-13 | Manufacture of flexible intumescent sheet |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0244964B1 (en) |
| JP (1) | JPS62268899A (en) |
| AT (1) | ATE62282T1 (en) |
| DE (1) | DE3769005D1 (en) |
| ES (1) | ES2021707B3 (en) |
| GB (2) | GB8611317D0 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3576708A (en) * | 1968-02-21 | 1971-04-27 | Nicolet Ind Inc | Asbestos materials of high dielectric strength and method of making same |
| US3954555A (en) * | 1972-09-29 | 1976-05-04 | National Gypsum Company | Fiber reinforced plastic articles and method of preparation |
| US3954556A (en) * | 1974-06-10 | 1976-05-04 | Johns-Manville Corporation | Inorganic composition for high temperature use and method of forming a millboard therefrom |
| CA1042587A (en) * | 1974-11-04 | 1978-11-14 | Minnesota Mining And Manufacturing Company | Intumescent sheet material |
| FR2396832A1 (en) * | 1977-07-08 | 1979-02-02 | Redco Sa | COMPOSITION OF MATERIAL BASED ON MINERAL FIBERS |
-
1986
- 1986-05-09 GB GB868611317A patent/GB8611317D0/en active Pending
-
1987
- 1987-04-13 AT AT87303189T patent/ATE62282T1/en active
- 1987-04-13 EP EP87303189A patent/EP0244964B1/en not_active Expired - Lifetime
- 1987-04-13 GB GB8708826A patent/GB2190110B/en not_active Expired
- 1987-04-13 ES ES87303189T patent/ES2021707B3/en not_active Expired - Lifetime
- 1987-04-13 DE DE8787303189T patent/DE3769005D1/en not_active Expired - Fee Related
- 1987-05-08 JP JP62112240A patent/JPS62268899A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE3769005D1 (en) | 1991-05-08 |
| GB2190110A (en) | 1987-11-11 |
| JPS62268899A (en) | 1987-11-21 |
| GB8708826D0 (en) | 1987-05-20 |
| GB2190110B (en) | 1989-12-06 |
| ES2021707B3 (en) | 1991-11-16 |
| GB8611317D0 (en) | 1986-06-18 |
| ATE62282T1 (en) | 1991-04-15 |
| EP0244964A1 (en) | 1987-11-11 |
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