EP0053897B1 - Biegsames stärkegebundenes Papier ohne Asbest - Google Patents

Biegsames stärkegebundenes Papier ohne Asbest Download PDF

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Publication number
EP0053897B1
EP0053897B1 EP81305597A EP81305597A EP0053897B1 EP 0053897 B1 EP0053897 B1 EP 0053897B1 EP 81305597 A EP81305597 A EP 81305597A EP 81305597 A EP81305597 A EP 81305597A EP 0053897 B1 EP0053897 B1 EP 0053897B1
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EP
European Patent Office
Prior art keywords
fibres
sheet material
weight
asbestos
slurry
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
Application number
EP81305597A
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English (en)
French (fr)
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EP0053897A1 (de
Inventor
Robert Allan Lancaster
Noel Christopher Mckenzie
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
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T&N Materials Research Ltd
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Filing date
Publication date
Application filed by T&N Materials Research Ltd filed Critical T&N Materials Research Ltd
Priority to AT81305597T priority Critical patent/ATE11311T1/de
Publication of EP0053897A1 publication Critical patent/EP0053897A1/de
Application granted granted Critical
Publication of EP0053897B1 publication Critical patent/EP0053897B1/de
Expired legal-status Critical Current

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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
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H17/63—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 relates to starch-bound paper, and provides non-asbestos alternatives to starch-bound asbestos papers.
  • Starch-bound asbestos papers contain asbestos fibres as the predominant raw material, these fibres being bound together with small amounts of hydrolysed starch 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.
  • 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.
  • EP-A-027 705 (priority: 19.10.79; date of filing: 09.10.80; date of publication: 29.04.81) describes non-asbestos sheet material comprising a matrix of unfired ball clay which is reinforced by vitreous fibres derived from wool-form material and by organic web-forming fibres, the whole being bound together by hydrolysed starch; said sheet material being made by dewatering on a water-permeable conveyor a layer of aqueous slurry of unfired ball clay, wool-form vitreous fibres, organic web-forming fibres and hydrolysed starch, and compressing and drying the dewatered layer; said aqueous slurry containing, by weight of solids content, the organic web-forming fibres in said slurry having a freeness in the range 60-90° Schopper-Riegler; the sheet material being of thickness 0.1-1.5 mm and of flexibility such that a specimen thereof measuring 50 mmx230 mm, with the 230 mm side parallel to the grain of the
  • the non-asbestos flexible sheet material of EP-A-027 705 can be made by substituting for the vitreous fibres (which are, of course, silicate material) particles of the silicate mineral mica or the silicate mineral chlorite, with the proviso that at least 75% by weight of those particles should pass through a sieve of aperture 250,um.
  • the aqueous slurry employed should have its solids content of ball clay in the range 30-60% by weight; and the solids content of the silicate mineral in the slurry should be in the range 25-55% by weight.
  • 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 their 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 manufacturing 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 the mineral mica or chlorite (the primary reinforcement) does.
  • the organic web-forming fibres are preferably cellulose fibres, but may alternatively be polyethylene or polypropylene fibres of the kind commercially available under the name "Pulpex”.
  • Mica and chlorite are non-fibrous charged-layer-silicate minerals.
  • the structure of mica is well known.
  • the chlorites have structures containing infinite two-dimensional ions of opposite electrical charge, the negatively charged layers having compositions ranging from the positively charged layers having the composition
  • 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. in kaolinite) are uncharged.
  • the hydrolysed starch is preferably a farina starch.
  • 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 in the range 700-1100 kg/m 3 , its tensile strength at least 3 MPa and its burst strength at least 40 KPa.
  • the papers of the invention may be impregnated with other materials, such as resins, to give special properties for particular purposes. They may have surface coatings e.g. of shellac varnish or synthetic resin applied to them. They may also be given a backing e.g. of manilla paper, to increase mechanical strength, especially tensile strength, when that is required in the wrapping of conductors and the like, and they may be incorporated in double or multiple layer constructions with glass threads between adjacent paper layers to give particularly high strength, as when wrapping cables.
  • other materials such as resins
  • They may have surface coatings e.g. of shellac varnish or synthetic resin applied to them. They may also be given a backing e.g. of manilla paper, to increase mechanical strength, especially tensile strength, when that is required in the wrapping of conductors and the like, and they may be incorporated in double or multiple layer constructions with glass threads between adjacent paper layers to give particularly high strength, as when wrapping cables.
  • the invention is further illustrated by the following Example.
  • the stock (slurry) of A above was made into flexible sheet material in 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 Federation, 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 properties of the paper thus obtained were:-
  • a specimen of paper (50 mmx230 mm, with the 230 mm side parallel to the grain) should show no evidence of breaking when bent through 180°C around a mandrel of 50 mm diameter, with use of just enough force to keep the specimen in contact with the mandrel.

Claims (4)

1. Biegsames Nichtasbest-Bahnmaterial mit einer Dicke von 0,1 bis 1,5 mm aus einer Matrix aus einem nichtgebrannten plastischen Ton, der durch ein Silikatmaterial und durch organische bahnbildende Fasern verstärkt ist, wobei das ganze durch hydrolysierte Stärke miteinander verbunden ist, und wobei das Bahnmaterial hergestellt wird durch Entwässern einer Schicht aus einer wäßrigen Aufschlämming auf einer wasserdurchlässigen Fördereinrichtung sowie durch Verpressen und Trocknen der entwässerten Schicht, und wobei die wäßrige Aufschlämmung, bezogen auf das Gewicht des Feststoffgehalts, folgende Bestandteile enthält
Figure imgb0008
wobei die organischen bahnbildenden Fasern in der Aufschlämmung ein Mahlgrad zwischen 60 und 90° Schopper-Riegler besitzen, das Bahnmaterial eine solche Flexibilität besitzt, daß eine Probe davon mit einer Abmessung von 50x230 mm, wobei die 230 mm-Seite parallel zu dem Korn des Materials verläuft, keine Anzeichen eines Brechens aufweist, wenn sie um 180° un einen Dorn mit einem Durchmesser von 50 mm gebogen wird, wobei gerade soviel Kraft angewendet wird, un die Probe in Kontakt mit dem Dorn zu halten, dadurch gekennzeichnet, daß das Silikatmaterial aus Teilchen des Minerals Glimmer oder Chlorit besteht, wobei wenigstens 75 Gew.-% durch ein Sieb mit einer Öffnung von 250 µm hindurchgehen, die Teilchen nicht mehr als 55 Gew.-% des Feststoffgehalts der Aufschlämmung ausmachen und der plastiche Ton zu nicht weniger als 30 Gew.-% des Feststoffgehalts der Aufschlämmung beiträgt.
2. Nichtasbest-Bahnmaterial gemäß Anspruch 1, dadurch gekennzeichnet, daß die organischen bahnbildenden Fasern aus Zellulosefasern bestehen.
3. Nichtasbest-Bahnmaterial nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie Reyon-Fasern als zusätzliche Verstärkung enthalten.
4. Nichtasbest-Bahnmaterial nach Anspruch 3, dadurch gekennzeichnet, daß der Gehalt an Reyon-Fasern 1 bis 10 Gew.-% beträgt.
EP81305597A 1980-12-05 1981-11-26 Biegsames stärkegebundenes Papier ohne Asbest Expired EP0053897B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81305597T ATE11311T1 (de) 1980-12-05 1981-11-26 Biegsames staerkegebundenes papier ohne asbest.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8039121 1980-12-05
GB8039121 1980-12-05

Publications (2)

Publication Number Publication Date
EP0053897A1 EP0053897A1 (de) 1982-06-16
EP0053897B1 true EP0053897B1 (de) 1985-01-16

Family

ID=10517787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81305597A Expired EP0053897B1 (de) 1980-12-05 1981-11-26 Biegsames stärkegebundenes Papier ohne Asbest

Country Status (5)

Country Link
EP (1) EP0053897B1 (de)
JP (1) JPS57121700A (de)
AT (1) ATE11311T1 (de)
DE (1) DE3168399D1 (de)
ZA (1) ZA818290B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130263B (en) * 1982-11-12 1985-10-02 T & N Materials Res Ltd Non-asbestos sheet material
DE19704478A1 (de) * 1997-02-06 1998-08-13 Merck Patent Gmbh Lasermarkierbare Papiere und Kartonagen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2031043A (en) * 1978-06-20 1980-04-16 Turner & Newall Ltd Fibrous Sheet Material
GB2057029B (en) * 1979-02-05 1983-03-30 Hollingsworth & Vose Co Sheet material containing exfoliated vermiculite
AU533396B2 (en) * 1979-10-19 1983-11-24 Turner & Newall Limited Non-asbestos paper

Also Published As

Publication number Publication date
JPS57121700A (en) 1982-07-29
ZA818290B (en) 1982-11-24
EP0053897A1 (de) 1982-06-16
DE3168399D1 (de) 1985-02-28
ATE11311T1 (de) 1985-02-15

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