EP0055033A1 - Non-asbestos paper - Google Patents
Non-asbestos paper Download PDFInfo
- Publication number
- EP0055033A1 EP0055033A1 EP81305598A EP81305598A EP0055033A1 EP 0055033 A1 EP0055033 A1 EP 0055033A1 EP 81305598 A EP81305598 A EP 81305598A EP 81305598 A EP81305598 A EP 81305598A EP 0055033 A1 EP0055033 A1 EP 0055033A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fibres
- sheet material
- slurry
- flexible sheet
- layer
- 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.)
- Withdrawn
Links
Classifications
-
- 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
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
Definitions
- This invention provides non-asbestos alternatives to asbestos papers.
- Asbestos papers contain asbestos fibres as the predominant raw material, these fibres being bound together with small amounts of hydrolysed starch, acrylic resin, or polyvinyl acetate to provide the necessary strength and flexibility.
- Such papers find use for a variety of purposes, e.g. as high temperature flexible insulation in electrical equipment. They are commonly made in the form of flexible sheet of thickness 0.1-1.5 mm. on conventional paper-making machines such as the Fourdrinier. In the process an aqueous slurry of the ingredients which are to compose the product is progressively dewatered as a layer on a water-permeable conveyor (usually of wire mesh), the dewatered layer being subsequently compressed and dried.
- a water-permeable conveyor usually of wire mesh
- the present invention provides non-asbestos flexible sheet material which has flexibility and toughness such that it is specially suited to conversion to corrugated form, suitable for use as thermally insulating material for pipes, domestic hot water boilers and the like.
- non-asbestos flexible sheet material of thickness 0.1-1.5 mm. comprises a matrix of unfired ball clay which is reinforced by organic web-forming fibres and by either
- Ball clay provides a flexible cohesive matrix.
- Ball clay is a fine-grained, highly plastic, mainly kaolinitic sedimentary clay.
- 'kaolinitic' and 'kaolinite' are mineralogical ones, indicating chemical composition and chemical structure; they are not to be confused with the term 'kaolin', used to denote a highly refractory clay which approaches the mineral kaolinite in chemical composition and structure but which - by contrast with ball clay - is hardly plastic at all.
- Various types of ball clay have varying proportions of kaolinite, micaceous material, and quartz, with small amounts of organic matter and other minerals.
- Ball clays are used mainly in the manufacture of pottery and refractories, in admixture with other clays (such as the kaolin mentioned earlier) to impart plasticity to them and to increase the green strength of the unfired ware.
- the function of the organic web-forming fibres is primarily to enable the paper to be formed on conventional paper-making machinery, but additionally those fibres impart strength to the ball clay matrix of the finished paper, just as do the vitreous fibres derived from wool-form material or the non-fibrous charged-layer-silicate mineral (the primary reinforcement).
- the organic web-forming fibres are preferably cellulose. fibres, but may alternatively be polyethylene or polypropylene fibres of the kind commercally available under the name PULPEX. In the preparation of the aqueous slurry to be dewatered, the web-forming fibres are employed at a freeness of 60-90° Schopper-Riegler.
- vitreous fibres derived from wool-form material provide the primary reinforcement
- the material may be mineral wool or glass wool. If glass wool is used, it is preferably employed in a form which has been treated with a silane coupling agent (e.g. gamma-aminopropyl triethoxysilane).
- a silane coupling agent e.g. gamma-aminopropyl triethoxysilane.
- the wool-form vitreous fibre material employed has fibres which are predominantly in the range 0.25-5mm in length.
- the particles should be capable of passing a sieve of aperture 250 um.
- the non-fibrous charged-layer-silicate mineral employed is preferably a mica or a chlorite.
- the chlorites have structures containing infinite two-dimensional ions of opposite electrical charge, the negatively charged layers having compositions ranging from [Mg 3 (AlSi 3 O 10 )(OH) 2 ]- to [Mg 2 Al(Al 2 Si 2 O 10 )(OH) 2 ]-, the positively charged layers having the composition [Mg 2 Al(OH) 6] +.
- Such non-fibrous charged-layer-silicate minerals are to be distinguished from non-fibrous layer silicate minerals such as kaolinite, talc and pyrophyllite, where the infinite 2-dimensional layers (e.g. A1 2 (OH) 4 Si 2 O 5 in kaolinite) are uncharged.
- the binder employed consists essentially of a synthetic resin, said resin being of the acrylic or polyvinyl acetate variety.
- Suitable acrylic resins are available in the form of synthetic polymeric latices consisting of a fine suspension in water of a copolymer based on an acrylic ester as the principal monomer.
- Suitable polyvinyl acetate resins are also available as synthetic resin emulsions consisting of a fine suspension in water of a polymer based on vinyl acetate.
- the paper may also contain a small proportion, suitably in the range of 1-10% of rayon fibres, to impart green strength to the sheet material between the dewatering and drying operations, and also to impart additional strength to the finished paper.
- the density of the paper will ordinarily be within the range 700-1100 kg/m 3 , its tensile strength at least 3 MPa and its burst strength at least 40 KPa.
- the paper can be corrugated in a corrugating machine of standard construction, and withstands very well the stresses imposed by passage between the corrugating rollers of the machine.
- the stock (slurry) of A above was made into flexible sheet material is an entirely conventional way on a Fourdrinier flat wire paper machine, such as is described in chapters 10 and 11 of "Paper and Board Manufacture” by Julius Grant, James H. young, and Barry G. Watson (Publishers: Technical Division, the British Paper and Board Industry Frederation, London 1978).
- the slurry is progressively dewatered as it travels on the water-permeable conveyor of the machine, and the dewatered material is consolidated by pressing between rollers, and then dried to low moisture content (suitably 2% by weight).
- the finished paper can at once or .later be submitted to a corrugating process as described, for example, in Chapter 24 (page 262ff) of "Paper - Its Merchanting and Usage", Editor S. Carter Gilmour (publ. The National Association of Paper Merchants, with Longmans, Green & Co.).
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
Non-asbestos alternatives to asbestos papers comprise a matrix of unfired ball clay which is reinforced by organic web-forming fibres such as cellulose and by either:
- (i) vitreous fibres derived from wool-form material or
- (ii) fine particles of a non-fibrous charged-layer-silicate mineral such as mica
the whole being bound together by a binder which consists es- sentiaiiy of a synthetic resin of the acrylic or polyvinyl acetate variety.
Description
- This invention provides non-asbestos alternatives to asbestos papers.
- Asbestos papers contain asbestos fibres as the predominant raw material, these fibres being bound together with small amounts of hydrolysed starch, acrylic resin, or polyvinyl acetate to provide the necessary strength and flexibility. Such papers find use for a variety of purposes, e.g. as high temperature flexible insulation in electrical equipment. They are commonly made in the form of flexible sheet of thickness 0.1-1.5 mm. on conventional paper-making machines such as the Fourdrinier. In the process an aqueous slurry of the ingredients which are to compose the product is progressively dewatered as a layer on a water-permeable conveyor (usually of wire mesh), the dewatered layer being subsequently compressed and dried.
- The present invention provides non-asbestos flexible sheet material which has flexibility and toughness such that it is specially suited to conversion to corrugated form, suitable for use as thermally insulating material for pipes, domestic hot water boilers and the like.
- According to the invention, non-asbestos flexible sheet material of thickness 0.1-1.5 mm. comprises a matrix of unfired ball clay which is reinforced by organic web-forming fibres and by either
- (i) vitreous fibres derived from wool-form material, or
- (ii) fine particles of a non-fibrous charged-layer-silicate mineral
- In the product of the present invention (referred to in the rest of the description as 'paper'), the ball clay provides a flexible cohesive matrix. Ball clay is a fine-grained, highly plastic, mainly kaolinitic sedimentary clay. (The terms 'kaolinitic' and 'kaolinite' are mineralogical ones, indicating chemical composition and chemical structure; they are not to be confused with the term 'kaolin', used to denote a highly refractory clay which approaches the mineral kaolinite in chemical composition and structure but which - by contrast with ball clay - is hardly plastic at all.) Various types of ball clay have varying proportions of kaolinite, micaceous material, and quartz, with small amounts of organic matter and other minerals. Ball clays are used mainly in the manufacture of pottery and refractories, in admixture with other clays (such as the kaolin mentioned earlier) to impart plasticity to them and to increase the green strength of the unfired ware.
- The function of the organic web-forming fibres is primarily to enable the paper to be formed on conventional paper-making machinery, but additionally those fibres impart strength to the ball clay matrix of the finished paper, just as do the vitreous fibres derived from wool-form material or the non-fibrous charged-layer-silicate mineral (the primary reinforcement). The organic web-forming fibres are preferably cellulose. fibres, but may alternatively be polyethylene or polypropylene fibres of the kind commercally available under the name PULPEX. In the preparation of the aqueous slurry to be dewatered, the web-forming fibres are employed at a freeness of 60-90° Schopper-Riegler.
- If vitreous fibres derived from wool-form material provide the primary reinforcement, the material may be mineral wool or glass wool. If glass wool is used, it is preferably employed in a form which has been treated with a silane coupling agent (e.g. gamma-aminopropyl triethoxysilane). Preferably, the wool-form vitreous fibre material employed has fibres which are predominantly in the range 0.25-5mm in length.
- If fine particles of a non-fibrous charged-layer-silicate mineral are used as primary reinforcement, the particles should be capable of passing a sieve of aperture 250 um. Preferably at least 75% by weight of the particulate non-fibrous charged-layer-silicate mineral present should meet this specification.
- The non-fibrous charged-layer-silicate mineral employed is preferably a mica or a chlorite. The chlorites have structures containing infinite two-dimensional ions of opposite electrical charge, the negatively charged layers having compositions ranging from [Mg3(AlSi3O10)(OH)2]- to [Mg2Al(Al2Si2O10)(OH)2]-, the positively
charged layers having the composition [Mg2Al(OH)6] +. Such non-fibrous charged-layer-silicate minerals are to be distinguished from non-fibrous layer silicate minerals such as kaolinite, talc and pyrophyllite, where the infinite 2-dimensional layers (e.g. A12(OH)4Si2O5 in kaolinite) are uncharged. - As already stated, the binder employed consists essentially of a synthetic resin, said resin being of the acrylic or polyvinyl acetate variety.
- Suitable acrylic resins are available in the form of synthetic polymeric latices consisting of a fine suspension in water of a copolymer based on an acrylic ester as the principal monomer.
- Suitable polyvinyl acetate resins are also available as synthetic resin emulsions consisting of a fine suspension in water of a polymer based on vinyl acetate.
- The paper may also contain a small proportion, suitably in the range of 1-10% of rayon fibres, to impart green strength to the sheet material between the dewatering and drying operations, and also to impart additional strength to the finished paper.
- The density of the paper will ordinarily be within the range 700-1100 kg/m3, its tensile strength at least 3 MPa and its burst strength at least 40 KPa. The paper can be corrugated in a corrugating machine of standard construction, and withstands very well the stresses imposed by passage between the corrugating rollers of the machine.
- The invention is further illustrated by-the following Examples.
-
- (i) Lapponia pulp (bleached softwood sulphate pulp) in sheet form was made into an aqueous slurry of solids content about 3% by weight and treated in a disc refiner until its freeness value was 90° Schopper Riegler.
- (ii) The pulp of (i) (500 g. dry weight = 16.7 kg. wet weight) was added to 90 ltres of water in a mixing tank, and the diluted pulp was agitated vigorously for 1 minute. There were then added, with vigorous stirring:
- mineral wool free from 'shot', ie. free from granular vitreous material; filament length 0.25-5mm
- ball clay (90% passing a sieve of aperture 5 µm)
- rayon fibre (3 denier; chopped to 3-8 mm. fibre length)
- acrylic latex (commercially available anionic emulsion of a self-crosslinking acrylic copolymer: pH 4; particle size 0.2 µm; 45.5% solids content; film curing at 120°C or below) diluted with 10 times its volume of water
- papermakers' alum to reduce the pH to 4/4.5
- in proportions such that the solids content of the resulting slurry was made up of 30% vitreous fibres derived from mineral wool, 5% cellulose fibres, 56% unfired ball clay, 3% rayon fibres and 6% acrylic resin.
- (iii) The slurry of (ii) was diluted to 1-3% solids content
- The stock (slurry) of A above was made into flexible sheet material is an entirely conventional way on a Fourdrinier flat wire paper machine, such as is described in chapters 10 and 11 of "Paper and Board Manufacture" by Julius Grant, James H. young, and Barry G. Watson (Publishers: Technical Division, the British Paper and Board Industry Frederation, London 1978).
- The slurry is progressively dewatered as it travels on the water-permeable conveyor of the machine, and the dewatered material is consolidated by pressing between rollers, and then dried to low moisture content (suitably 2% by weight). The finished paper can at once or .later be submitted to a corrugating process as described, for example, in Chapter 24 (page 262ff) of "Paper - Its Merchanting and Usage", Editor S. Carter Gilmour (publ. The National Association of Paper Merchants, with Longmans, Green & Co.).
- As in Example 1, except that under (ii), the acrylic latex is replaced by:-
- polyvinyl acetate emulsion (viscosity at 25°C, 10-18 poise; pH 4-4.5; stabilised with polyvinyl alcohol; solids content 53%) diluted with 10 times its volume of water; polyvinyl acetate content of slurry (ii) was 6% by weight.
-
- (i) Lapponia pulp (bleached softwood sulphate pulp) in sheet form was made into an aqueous slurry of solids content about 3% by weight and treated in a disc refiner until its freeness value was 90° Schopper Riegler.
- (ii) The pulp of (i) (500 g. dry weight = 16.7 Kg. wet weight) was added to 90 litres of water in a mixing tank, and the diluted pulp was agitated vigorously for 1 minute. There were then added, with vigorous stirring:
- non-fibrous charged-layer silicate mineral (mica or chlorite), at least 75% by weight of which passes through a sieve of aperture 250 µm.
- ball clay (90% passing a sieve of aperture 5 µm )
- rayon fibre (3 denier; chopped to 3-8mm. fibre length)
- acrylic latex (particle size 0.2 pm; 45.5% solids content) diluted with 10 times its volume of water papermakers' alum to reduce the pH to 4/4.5
- in proportions such that the solids content of the resulting slurry was made up of 46% non-fibrous charged-layer-silicate mineral, 5% cellulose fibres, 40% unfired ball clay, 3% rayon fibres and 6% acrylic resin.
- (iii) The slurry of (ii) was diluted to 1-3% solids content.
- As in Example 3, except that under (ii), the acrylic latex is replaced by:-
- polyvinyl acetate emulsion (53% solids content) diluted with 10 times its volume of water
- As in Example 1.
the whole being bound together by a binder which consists essentially of a synthetic resin, said resin being of the acrylic or polyvinyl acetate variety; said flexible sheet material being made by dewatering on a water-permeable conveyor a layer of aqueous slurry of unfired ball clay, organic web-forming fibres, and either (i) vitreous fibres derived from wool-form material or (ii) fine particles of a non-fibrous charged-layer-silicate mineral, said slurry containing a synthetic resin of the acrylic or polyvinyl acetate variety; and compressing and drying the dewatered layer; said aqueous slurry containing, by weight of solids content,
Claims (5)
1. Non-asbestos flexible sheet material of thickness 0.I-1.5mm comprising a matrix of unfired ball clay which is reinforced by organic web-forming fibres and by either
(i) vitreous fibres derived from wool-form material, or
(ii) fine particles of a non-fibrous charged-layer-silicate mineral the whole being bound together by a binder which consists essentially of a synthetic resin, said resin being of the acrylic or polyvinyl acetate variety'; said flexible sheet material being made by dewatering on a water-permeable conveyor a layer of aqueous slurry of unfired ball clay, organic web-forming fibres, and either (i) vitreous fibres derived from wool-form material or (ii) fine particles of non-fibrous charged- layer-silicate mineral, said slurry containing a synthetic resin of the acrylic or polyvinyl acetate variety; and compressing and drying the dewatered layer; said aqueous slurry containing, by weight of solids content,
2. Flexible sheet material according to claim 1, in which the organic web-forming fibres are cellulose fibres.
3. Flexible sheet material according to claim 1 or 2, made from a slurry which includes rayon fibres as additional reinforcement for the sheet material.
4. Flexible sheet material according to claim 3, in which the content of rayon fibres in the slurry is 1 to 10% by weight of slurry solids.
5. Flexible sheet material according to any preceding claim, in which the organic web-forming fibres present in the slurry have a freeness of 60-90° Schopper-Riegler.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8040810 | 1980-12-19 | ||
GB8040810 | 1980-12-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0055033A1 true EP0055033A1 (en) | 1982-06-30 |
Family
ID=10518120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81305598A Withdrawn EP0055033A1 (en) | 1980-12-19 | 1981-11-26 | Non-asbestos paper |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0055033A1 (en) |
JP (1) | JPS57128299A (en) |
ZA (1) | ZA818291B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109209A2 (en) * | 1982-11-12 | 1984-05-23 | T&N Materials Research Limited | Flexible sheet material |
FR2545115A1 (en) * | 1983-04-27 | 1984-11-02 | T & N Materials Res Ltd | FLEXIBLE SHEET WITHOUT ASBESTOS AND JOINT CONSISTING OF SUCH A SHEET |
FR2610954A1 (en) * | 1987-02-17 | 1988-08-19 | Armstrong World Ind Inc | WATER RESISTANT SILICATE AND POLYMER STRUCTURE MATERIAL AND METHOD OF MANUFACTURING THE SAME |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59187697A (en) * | 1983-04-01 | 1984-10-24 | 株式会社クラレ | Filler fixing agent for paper |
JPH04135453U (en) * | 1991-06-10 | 1992-12-16 | 積水化成品工業株式会社 | Supporting materials and collective packaging for instrument panels, etc. |
JP6430377B2 (en) | 2013-05-30 | 2018-11-28 | 京セラ株式会社 | Unit, electronic device, and method of manufacturing electronic device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2031043A (en) * | 1978-06-20 | 1980-04-16 | Turner & Newall Ltd | Fibrous Sheet Material |
WO1980001576A1 (en) * | 1979-02-05 | 1980-08-07 | Hollingsworth & Vose Co | Sheet material containing exfoliated vermiculite |
EP0027705A1 (en) * | 1979-10-19 | 1981-04-29 | Turner & Newall Plc | Starch bound non-asbestos paper |
-
1981
- 1981-11-26 EP EP81305598A patent/EP0055033A1/en not_active Withdrawn
- 1981-11-30 ZA ZA818291A patent/ZA818291B/en unknown
- 1981-12-18 JP JP56205047A patent/JPS57128299A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2031043A (en) * | 1978-06-20 | 1980-04-16 | Turner & Newall Ltd | Fibrous Sheet Material |
WO1980001576A1 (en) * | 1979-02-05 | 1980-08-07 | Hollingsworth & Vose Co | Sheet material containing exfoliated vermiculite |
EP0027705A1 (en) * | 1979-10-19 | 1981-04-29 | Turner & Newall Plc | Starch bound non-asbestos paper |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0109209A2 (en) * | 1982-11-12 | 1984-05-23 | T&N Materials Research Limited | Flexible sheet material |
EP0109209A3 (en) * | 1982-11-12 | 1984-06-27 | T&N Materials Research Limited | Flexible sheet material |
FR2545115A1 (en) * | 1983-04-27 | 1984-11-02 | T & N Materials Res Ltd | FLEXIBLE SHEET WITHOUT ASBESTOS AND JOINT CONSISTING OF SUCH A SHEET |
FR2610954A1 (en) * | 1987-02-17 | 1988-08-19 | Armstrong World Ind Inc | WATER RESISTANT SILICATE AND POLYMER STRUCTURE MATERIAL AND METHOD OF MANUFACTURING THE SAME |
BE1001197A3 (en) * | 1987-02-17 | 1989-08-16 | Armstrong World Ind Inc | Structure of material based on silicate and polymer, water resistant, and manufacturing method thereof. |
Also Published As
Publication number | Publication date |
---|---|
JPS57128299A (en) | 1982-08-09 |
ZA818291B (en) | 1982-11-24 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Designated state(s): AT BE DE FR GB IT NL SE |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19830606 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: MCKENZIE, NOEL CHRISTOPHER Inventor name: LANCASTER, ROBERT ALLAN Inventor name: HARGREAVES, BRIAN |