EP0244964A1 - Manufacture of flexible intumescent sheet - Google Patents

Manufacture of flexible intumescent sheet Download PDF

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Publication number
EP0244964A1
EP0244964A1 EP87303189A EP87303189A EP0244964A1 EP 0244964 A1 EP0244964 A1 EP 0244964A1 EP 87303189 A EP87303189 A EP 87303189A EP 87303189 A EP87303189 A EP 87303189A EP 0244964 A1 EP0244964 A1 EP 0244964A1
Authority
EP
European Patent Office
Prior art keywords
sheet
manufacture
layer
flexible intumescent
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.)
Granted
Application number
EP87303189A
Other languages
German (de)
French (fr)
Other versions
EP0244964B1 (en
Inventor
Alasdair Ian Stevenson
John Dinsdale Crabtree
Brian Hargreaves
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
T&N Materials Research Ltd
Original Assignee
T&N Materials Research Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by T&N Materials Research Ltd filed Critical T&N Materials Research Ltd
Priority to AT87303189T priority Critical patent/ATE62282T1/en
Publication of EP0244964A1 publication Critical patent/EP0244964A1/en
Application granted granted Critical
Publication of EP0244964B1 publication Critical patent/EP0244964B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Catalysts (AREA)
  • Materials For Medical Uses (AREA)
  • Building Environments (AREA)
  • Making Paper Articles (AREA)
  • Bedding Items (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 0.5gm/ml and is typically of thickness 2.5mm. 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 0.5gm/ml or more, and dried at about 900C 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 2.5mm. 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:
    • 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 Industry 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 5mm 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 10mm or more has been built up.

Claims (3)

1. A process for the manufacture of flexible intumescent sheet by dewatering a layer of aqueous suspension comprising heat-expandable micaceous mineral, 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 in that the dewatered layer is before drying wound onto a drum so as to obtain a laminar product.
2. A process according to claim 1, in which the laminar layer formed on the drum is of thickness greater than 2.5mm.
3. A process accoring to claim 1 or 2, in which the inorganic fibrous material is refractory aluminosilicate fibre.
EP87303189A 1986-05-09 1987-04-13 Manufacture of flexible intumescent sheet Expired - Lifetime EP0244964B1 (en)

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
GB868611317A GB8611317D0 (en) 1986-05-09 1986-05-09 Flexible intumescent sheet
GB8611317 1986-05-09

Publications (2)

Publication Number Publication Date
EP0244964A1 true EP0244964A1 (en) 1987-11-11
EP0244964B1 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)

Citations (5)

* Cited by examiner, † Cited by third party
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
US3954556A (en) * 1974-06-10 1976-05-04 Johns-Manville Corporation Inorganic composition for high temperature use and method of forming a millboard therefrom
US3954555A (en) * 1972-09-29 1976-05-04 National Gypsum Company Fiber reinforced plastic articles and method of preparation
GB1513808A (en) * 1974-11-04 1978-06-07 Minnesota Mining & Mfg Intumescant sheet material
GB2001371A (en) * 1977-07-08 1979-01-31 Redco Sa Composition of a material based on mineral fibres

Patent Citations (5)

* Cited by examiner, † Cited by third party
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
GB1513808A (en) * 1974-11-04 1978-06-07 Minnesota Mining & Mfg Intumescant sheet material
GB2001371A (en) * 1977-07-08 1979-01-31 Redco Sa Composition of a material based on mineral fibres

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H. HENTSCHEL VON OBERING: "Chemische Technologie der Zellstoff- und Papierherstellung", 3rd edition, 1967, pages 552-559, VEB Fachbuchverlag Leipzig, DD *

Also Published As

Publication number Publication date
GB8611317D0 (en) 1986-06-18
EP0244964B1 (en) 1991-04-03
GB2190110B (en) 1989-12-06
ES2021707B3 (en) 1991-11-16
GB2190110A (en) 1987-11-11
JPS62268899A (en) 1987-11-21
DE3769005D1 (en) 1991-05-08
GB8708826D0 (en) 1987-05-20
ATE62282T1 (en) 1991-04-15

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