EP0149332A2 - Dispositif pour fabriquer des panneaux en ciment renforcé par des fibres - Google Patents

Dispositif pour fabriquer des panneaux en ciment renforcé par des fibres Download PDF

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Publication number
EP0149332A2
EP0149332A2 EP84308626A EP84308626A EP0149332A2 EP 0149332 A2 EP0149332 A2 EP 0149332A2 EP 84308626 A EP84308626 A EP 84308626A EP 84308626 A EP84308626 A EP 84308626A EP 0149332 A2 EP0149332 A2 EP 0149332A2
Authority
EP
European Patent Office
Prior art keywords
belt
roller
vessel
nip
superposed
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Withdrawn
Application number
EP84308626A
Other languages
German (de)
English (en)
Other versions
EP0149332A3 (fr
Inventor
Jack Lawrenson
Kenneth John Pearson
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers 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 Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Publication of EP0149332A2 publication Critical patent/EP0149332A2/fr
Publication of EP0149332A3 publication Critical patent/EP0149332A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
    • B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • B28B1/526—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement by delivering the materials on a conveyor of the endless-belt type

Definitions

  • This invention relates to apparatus for making fibre-reinforced cement sheet material, particularly but not exclusively such material reinforced with glass fibres.
  • the present invention is more particularly concerned with apparatus of the kind comprising a vessel for holding an aqueous fibre-containing cement slurry and an endless water-pervious belt for receiving and de-watering a layer of the slurry and arranged to move around a series of guide rollers, one of said guide rollers cooperating with a superposed parallel roller to define the outlet for the slurry from the vessel on to the belt.
  • apparatus of this kind is described, for example, in U.K. Patent Application No. 2059867A of Bell Maschinenfabrik AG.
  • Various measures, including agitators in the vessel have been proposed to improve the mixing of the fibres into the cement and to ensure random distribution of the fibres, but none have been wholly successful.
  • apparatus of the kind comprising a vessel for holding an aqueous fibre-containing cement slurry and an endless water-pervious belt for receiving and de-watering a layer of the slurry and arranged to move around a series of guide rollers, one of said guide rollers cooperating with a superposed parallel roller to define the outlet for the slurry from the vessel on to the belt, an agitator is provided in the vessel, extending into the nip between the superposed roller and the belt where it passes around the guide roller and extending across the width of the nip, so as to cause turbulence in the slurry immediately upstream of the outlat.
  • the agitator is preferably formed by a series of similar parallel blades disposed in vertical planes and spaced from one another across the width of the nip.
  • the blades are disposed in planes parallel to the direction of novement of the belt and are mounted for reciprocating movement paral el to the width of the nip.
  • the reciprocating movement of the blades produces turbulence in the cement slurry immediately pstream of tie outlet and thereby produces improved uniformity of dis.ribution of the fibres in the cement while reducing their tendency to be oriented in one direction.
  • the blades ⁇ y each have a vertically extending upper portion connected to a comon horizontally re:iprocable carriagf and a curved lower portion whi h has one edge lying closely adjacent to the superposed roller and which has its lower end extending into tte nip between the superposed roller and the belt passing around the juide roller.
  • the carriage my be mounted on rollers above the ves el for its horizontal reciproc ting movement, and may be arranged tc be driven by a crank and connectng rod from a motor.
  • the means for reciprocting the blades are disposed convenieitly above the level of the ceme slurry in the vessel but the lower ends of the blades provide the ne cessary turbulence just where it is required, as the cement slurry er ers the outlet and is deposited on the belt.
  • Fibre-reinforced current sheet material made on apparatus in accordance with the inventiorhas been found to have consideratly improved strength properti;, particularly as regards the ratio of 'trength in the longitudinal direction to that in the transverse direction, due to the more uniform distribution of the fibres and the reduced orientation of the fibres in the cement. This is particularly noted in sheet materials using glass fibres as reinforcement.
  • the apparatus comprises a vessel 10 for holding an aqueous fibre-containing cement slurry 11, and an endless water-pervious belt 12, e.g. of felt, which is arranged to be driven around a series of guide rollers 13, 14, 15. Slurry is delivered to the vessel 10 continuously during operation through a supply pipe 16.
  • the right hand end of the vessel 10 is defined partly by the upper surface of the belt 12 as it passes around the guide roller 13 and partly by a superposed roller 17, which is driven in the opposite sense to the sense of rotation of the guide roller 13.
  • a small gap 18 between the upper surface of the belt 12 and the lowermost part of the periphery of the roller 17 constitutes the outlet from the vessel 10 and permits a thin layer 19 of the cement slurry to be deposited on the belt.
  • a rotary agitator 20 is disposed in the vessel 10 to cause turbulence in the slurry 11.
  • the layer 19 of fibre-containing cement slurry on the belt 12 is de-watered in known manner through the belt using a first gravity drainage chamber 24 and a second suction drainage chamber 25. After de-watering, the layer 19 becomes a cohesive web 26 of fibre-reinforced cement which is picked up from the belt 12 and wound on to a rotatable pivotally mounted receiving roller 27. When a sufficient thickness of fibre-reinforced cement has been built up on the surface of the roller 27, it is cut axially of the roller and taken off for pressure de-watering and curing.
  • the novel features of the present invention lie in the additional agitator provided in the vessel 10, extending into the nip between the roller 17 and the belt 12.
  • This agitator is formed by a series of similar parallel blades 30 which are disposed in vertical planes parallel to the direction of movement of the belt 12 (i.e. at right angles to the axes of the rollers 13, 17) and spaced from one another across the width of the vessel 10 and the outlet 18 immediately upstream of the latter.
  • the blades 30 each have a vertically extending upper portion 31 secured to a respective web 32 of a vertical channel section member 33 secured to a horizontal beam 34 extending across the width of the vessel 10.
  • the beam 34 is provided with upper and lower rails 35, 36 engaging grooved upper and lower rollers 37, 38 mounted on fixed pivots 39 on upstanding brackets 40 bolted to respective sides of the vessel 10.
  • the beam 34 with the channel section members 33 thus constitutes a carriage which is horizontally reciprocable between the rollers 37, 38.
  • For producing such horizontal reciprocating movement of the carriage 33, 34 it is connected via a pivotally mounted connecting rod 41 to a crank pin 42 on a disc 48 which is driven by a belt 43 from a motor (not shown).
  • the carriage speed can be varied independently of the speed of the belt 12, though their drives may be electrically linked so that increase in the speed of the belt 12 results in an increase in the speed of the carriage 33, 34.
  • the blades 30 are connected to one another near their mid-lengths by a spacer rod 44.
  • the lower portion 45 of each blade 30 is curved and has one edge 46 lying closely adjacent to the periphery of the upper roller 17.
  • the end 47 of each blade 30 extends into the nip between the upper surface of the belt 12 passing round the guide roller 13 and the superposed roller 17.
  • Horizontal reciprocating movement of the carriage 33, 34 thus causes the blades 30 to reciprocate horizontally, at right angles to their width, and to cause turbulence just where it is required for mixing the fibres more uniformly in the slurry and reducing their tendency to lie parallel to one another.
  • agitator extending into the nip between the roller 17 and belt 12 may be employed in place of or in addition to the blades 30.
  • air may be bubbled into the fibre-containing cement slurry from a tube or tubes having outlets in the nip.
  • small-bore tubes may be attached to the sides of the blades 30, the open outlet ends of the tubes being located close to the ends 47 of the blades.
  • Means may alternatively be provided for oscillating each blade 30 about a respective vertical axis lying along its upper portion 31, either in place of or in addition to the reciprocating movement of all the blades parallel to the width of the nip.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
EP84308626A 1984-01-05 1984-12-12 Dispositif pour fabriquer des panneaux en ciment renforcé par des fibres Withdrawn EP0149332A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8400226 1984-01-05
GB08400226A GB2152423A (en) 1984-01-05 1984-01-05 Apparatus for making fibre-reinforced cement sheet material

Publications (2)

Publication Number Publication Date
EP0149332A2 true EP0149332A2 (fr) 1985-07-24
EP0149332A3 EP0149332A3 (fr) 1987-01-07

Family

ID=10554598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84308626A Withdrawn EP0149332A3 (fr) 1984-01-05 1984-12-12 Dispositif pour fabriquer des panneaux en ciment renforcé par des fibres

Country Status (7)

Country Link
EP (1) EP0149332A3 (fr)
JP (1) JPS60179203A (fr)
AU (1) AU3660884A (fr)
ES (1) ES539124A0 (fr)
FI (1) FI845104L (fr)
GB (1) GB2152423A (fr)
ZA (1) ZA849882B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114274309A (zh) * 2021-12-31 2022-04-05 贵州瑞气升腾实业有限公司 一种grc构件喷射制作工艺
US12330478B2 (en) 2019-09-24 2025-06-17 Vitesco Technologies GmbH Heating arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE370422C (de) * 1923-03-02 Max Wenzel Vorrichtung zum Erzielen einer guten Durchmischung des Stoffwassers und vermehrter Querlagerung von Fasern an Langsiebpapiermaschinen mit am Stoffkasten angeordneter Stoffauslassduese
US2860552A (en) * 1955-01-26 1958-11-18 Black Clawson Co Flow evener roll for paper making machines
CH641085A5 (de) * 1979-10-08 1984-02-15 Bell Ag Maschf Maschine zur herstellung von bauplatten.
DE2950923C2 (de) * 1979-12-18 1981-11-26 Ewers, Werner, 4791 Hövelhof Vorrichtung zum kontinuierlichen Aufbringen eines breiigen Gemisches auf flache Formen zur Herstellung zementgebundener Holzspanplatten

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12330478B2 (en) 2019-09-24 2025-06-17 Vitesco Technologies GmbH Heating arrangement
CN114274309A (zh) * 2021-12-31 2022-04-05 贵州瑞气升腾实业有限公司 一种grc构件喷射制作工艺
CN114274309B (zh) * 2021-12-31 2024-02-09 贵州瑞气升腾实业有限公司 一种grc构件喷射制作工艺

Also Published As

Publication number Publication date
GB2152423A (en) 1985-08-07
EP0149332A3 (fr) 1987-01-07
ES8601753A1 (es) 1985-11-01
AU3660884A (en) 1985-12-05
FI845104A7 (fi) 1985-07-06
FI845104A0 (fi) 1984-12-21
FI845104L (fi) 1985-07-06
ZA849882B (en) 1986-07-30
ES539124A0 (es) 1985-11-01
JPS60179203A (ja) 1985-09-13
GB8400226D0 (en) 1984-02-08

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