EP0149332A2 - Apparatus for making fibre-reinforced cement sheet material - Google Patents
Apparatus for making fibre-reinforced cement sheet material Download PDFInfo
- 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- Withdrawn
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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.
Abstract
Description
- This invention relates to apparatus for making fibre-reinforced cement sheet material, particularly but not exclusively such material reinforced with glass fibres.
- Various types of machines have been developed for making cement sheet materials reinforced with asbestos 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.
- A problem which arises in such machines, particularly when using glass fibres, is the tendency for the fibres to become unevenly distributed and to be aligned predominantly in one direction, the direction of movement of the belt, with the result that the strength of the sheet material produced is lower than it could be with uniform random distribution of the fibres, and in particular is substantially lower in the direction transverse to the direction of movement of the belt than it is in the direction of movement. 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.
- According to the present invention, in 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. Advantageously 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.
- Conveniently the blades π 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. With such an at angement, 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.
- A specific embodiment of the invention will now be described in more detail by way of example and with reference to the accompanying drawings, in which:
- FIGURE 1 is a schematic side elevational view of an apparatus in accordance with the invention,
- FIGURE 2 is a longitudinal sectional view to a larger scale of the left hand end of Figure 1, and
- FIGURE 3 is an end elevation, to a larger scale again, showing the mounting of the parallel blades in the apparatus of Figures 1 and 2.
- As shown in Figures 1 and 2, 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 ofguide rollers vessel 10 continuously during operation through asupply pipe 16. The right hand end of thevessel 10 is defined partly by the upper surface of thebelt 12 as it passes around theguide roller 13 and partly by a superposed roller 17, which is driven in the opposite sense to the sense of rotation of theguide roller 13. Asmall gap 18 between the upper surface of thebelt 12 and the lowermost part of the periphery of the roller 17 constitutes the outlet from thevessel 10 and permits athin layer 19 of the cement slurry to be deposited on the belt. In accordance with normal practice, arotary agitator 20 is disposed in thevessel 10 to cause turbulence in the slurry 11. - The
layer 19 of fibre-containing cement slurry on thebelt 12 is de-watered in known manner through the belt using a firstgravity drainage chamber 24 and a secondsuction drainage chamber 25. After de-watering, thelayer 19 becomes acohesive web 26 of fibre-reinforced cement which is picked up from thebelt 12 and wound on to a rotatable pivotally mountedreceiving roller 27. When a sufficient thickness of fibre-reinforced cement has been built up on the surface of theroller 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 thebelt 12. This agitator is formed by a series of similarparallel 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 therollers 13, 17) and spaced from one another across the width of thevessel 10 and theoutlet 18 immediately upstream of the latter. Theblades 30 each have a vertically extendingupper portion 31 secured to arespective web 32 of a verticalchannel section member 33 secured to ahorizontal beam 34 extending across the width of thevessel 10. Thebeam 34 is provided with upper andlower rails lower rollers pivots 39 onupstanding brackets 40 bolted to respective sides of thevessel 10. Thebeam 34 with thechannel section members 33 thus constitutes a carriage which is horizontally reciprocable between therollers carriage rod 41 to acrank pin 42 on adisc 48 which is driven by abelt 43 from a motor (not shown). The carriage speed can be varied independently of the speed of thebelt 12, though their drives may be electrically linked so that increase in the speed of thebelt 12 results in an increase in the speed of thecarriage - The
blades 30 are connected to one another near their mid-lengths by aspacer rod 44. Thelower portion 45 of eachblade 30 is curved and has oneedge 46 lying closely adjacent to the periphery of the upper roller 17. Theend 47 of eachblade 30 extends into the nip between the upper surface of thebelt 12 passing round theguide roller 13 and the superposed roller 17. Horizontal reciprocating movement of thecarriage 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. Measurements of the modulus of rupture of glass-fibre reinforced cement sheet material were made on the apparatus described above, in directions parallel and transverse to the length of the sheet, i.e. to the direction of movement of thebelt 12, firstly with agitation by reciprocation of theblades 30 and secondly without such reciprocation, for comparison. The ratio of modulus of rupture in the longitudinal direction to that in the transverse direction was approximately 1.3 for the sheet made with such agitation and approximately 1.6 for the sheet made without agitation, showing the improvement resulting from the present invention. - Other forms of agitator extending into the nip between the roller 17 and
belt 12 may be employed in place of or in addition to theblades 30. For example, air may be bubbled into the fibre-containing cement slurry from a tube or tubes having outlets in the nip. For this purpose, small-bore tubes may be attached to the sides of theblades 30, the open outlet ends of the tubes being located close to theends 47 of the blades. Means may alternatively be provided for oscillating eachblade 30 about a respective vertical axis lying along itsupper portion 31, either in place of or in addition to the reciprocating movement of all the blades parallel to the width of the nip.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08400226A GB2152423A (en) | 1984-01-05 | 1984-01-05 | Apparatus for making fibre-reinforced cement sheet material |
GB8400226 | 1984-01-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0149332A2 true EP0149332A2 (en) | 1985-07-24 |
EP0149332A3 EP0149332A3 (en) | 1987-01-07 |
Family
ID=10554598
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84308626A Withdrawn EP0149332A3 (en) | 1984-01-05 | 1984-12-12 | Apparatus for making fibre-reinforced cement sheet material |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0149332A3 (en) |
JP (1) | JPS60179203A (en) |
AU (1) | AU3660884A (en) |
ES (1) | ES8601753A1 (en) |
FI (1) | FI845104L (en) |
GB (1) | GB2152423A (en) |
ZA (1) | ZA849882B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114274309A (en) * | 2021-12-31 | 2022-04-05 | 贵州瑞气升腾实业有限公司 | GRC member injection manufacturing process |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE370422C (en) * | 1923-03-02 | Max Wenzel | Device for achieving good mixing of the stock water and increased cross storage of fibers on fourdrinier paper machines with stock outlet nozzle arranged on the stock box | |
US2860552A (en) * | 1955-01-26 | 1958-11-18 | Black Clawson Co | Flow evener roll for paper making machines |
DE2950923B1 (en) * | 1979-12-18 | 1981-03-26 | Werner 4791 Hövelhof Ewers | Device for the continuous application of a pulpy mixture on flat molds for the production of cement-bonded chipboard |
GB2059867A (en) * | 1979-10-08 | 1981-04-29 | Bell Ag Maschf | Apparatus for producing building-panels |
-
1984
- 1984-01-05 GB GB08400226A patent/GB2152423A/en not_active Withdrawn
- 1984-12-12 EP EP84308626A patent/EP0149332A3/en not_active Withdrawn
- 1984-12-13 AU AU36608/84A patent/AU3660884A/en not_active Abandoned
- 1984-12-19 ZA ZA849882A patent/ZA849882B/en unknown
- 1984-12-21 FI FI845104A patent/FI845104L/en not_active Application Discontinuation
- 1984-12-27 ES ES539124A patent/ES8601753A1/en not_active Expired
- 1984-12-28 JP JP59275011A patent/JPS60179203A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE370422C (en) * | 1923-03-02 | Max Wenzel | Device for achieving good mixing of the stock water and increased cross storage of fibers on fourdrinier paper machines with stock outlet nozzle arranged on the stock box | |
US2860552A (en) * | 1955-01-26 | 1958-11-18 | Black Clawson Co | Flow evener roll for paper making machines |
GB2059867A (en) * | 1979-10-08 | 1981-04-29 | Bell Ag Maschf | Apparatus for producing building-panels |
DE2950923B1 (en) * | 1979-12-18 | 1981-03-26 | Werner 4791 Hövelhof Ewers | Device for the continuous application of a pulpy mixture on flat molds for the production of cement-bonded chipboard |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114274309A (en) * | 2021-12-31 | 2022-04-05 | 贵州瑞气升腾实业有限公司 | GRC member injection manufacturing process |
CN114274309B (en) * | 2021-12-31 | 2024-02-09 | 贵州瑞气升腾实业有限公司 | GRC component injection manufacturing process |
Also Published As
Publication number | Publication date |
---|---|
EP0149332A3 (en) | 1987-01-07 |
FI845104L (en) | 1985-07-06 |
GB2152423A (en) | 1985-08-07 |
ES539124A0 (en) | 1985-11-01 |
FI845104A0 (en) | 1984-12-21 |
AU3660884A (en) | 1985-12-05 |
ES8601753A1 (en) | 1985-11-01 |
GB8400226D0 (en) | 1984-02-08 |
JPS60179203A (en) | 1985-09-13 |
ZA849882B (en) | 1986-07-30 |
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18W | Application withdrawn |
Withdrawal date: 19871124 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PEARSON, KENNETH JOHN Inventor name: LAWRENSON, JACK |