GB2041823A - Improvements in and Relating to the Manufacture of Fibre Reinforced Products - Google Patents
Improvements in and Relating to the Manufacture of Fibre Reinforced Products Download PDFInfo
- Publication number
- GB2041823A GB2041823A GB7903534A GB7903534A GB2041823A GB 2041823 A GB2041823 A GB 2041823A GB 7903534 A GB7903534 A GB 7903534A GB 7903534 A GB7903534 A GB 7903534A GB 2041823 A GB2041823 A GB 2041823A
- Authority
- GB
- United Kingdom
- Prior art keywords
- corrugated
- sheets
- sheet
- pressing
- fibres
- 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- Withdrawn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
- 239000000835 fiber Substances 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 7
- 230000032798 delamination Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000003365 glass fiber Substances 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 8
- 239000010425 asbestos Substances 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 229920003043 Cellulose fiber Polymers 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000000969 carrier Substances 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/02—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material with fibres or particles being present as additives in the layer
-
- 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
- B28B1/528—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement for producing corrugated sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
- B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
A process for overcoming delamination problems at the inner radii of corrugated fibre reinforced cement sheets, by first making by a conventional process, two or more precursor corrugated sheets whose total thickness is sufficient to produce the required thickness of finished corrugated sheet, pressing these together, and then allowing the resultant multi layer sheet to harden and set. The precursor sheets are each made thin enough to avoid delamination problems.
Description
SPECIFICATION
Improvements in and Relating to the
Manufacture of Fibre Reinforced Products
This invention relates to the manufacture of fibre reinforced corrugated sheets by processes which include the step of forming a layer on the surface of a rotating sieve from an aqueous slurry and subsequently winding the layer onto a cylinder until the required thickness of material is achieved.
In the past slurries have comprised asbestos fibres, cement and water, and more recently glass fibres, cellulose fibres, plastics fibres and other fibres have substituted the asbestos. Optionally other constituents can be included such as fillers (including low density materials) and additives to improve layer formation. In the most commonly used process, the ingredients are mixed and dispersed in water, held in an agitated storage container and then fed evenly with the addition of more water to dilute to an appropriate consistency to one or more layer forming vats in which of each a cylindrical sieve is rotated.Each of these cylindrical sieves picks up the slurry as a continuous, thin wet layer, excess water draining through the meshes of the sieve, and the layer is transferred to an endless conveyor belt made from felt, by which it is carried to a rotating cylinder to which it is transferred and on to which it is wound until the requisite thickness has been built up. On reaching the required thickness on the cylinder (known as the forming bowl) the layered product on the cylinder is cut axially and laid flat.
Corrugated sheets are made by passing these sheets through corrugating devices which bend the sheets into the required corrugated shape and place them onto corrugated sheet metal carriers (termed templates) after which the cement ingredient hardens and sets the product in the corrugated shape.
Problems occur when relatively long fibres such as glass are used when making sheets of 4 mm or greater thickness. As each corrugation is being formed it is necessary for the layers at the outer radius to shorten in the direction of the curves. When the layers are stiff and do not readily extend or compress, as occurs frequently for example when glass fibres are used, the inner layer will not shorten sufficiently along the curve of the inner radius, and the action of corrugating the sheet causes the layers at the inside radius to delaminate from the main body of the sheet and bulge inwards towards the corrugation's centre of curvature, thus making an unsatisfactory corrugated sheet product on account of it not conforming to the dimensional requirements, and the presence of a zone of delamination which could eventually spread.
This invention resides in a process for producing corrugated multi layer sheets, by first making by the conventional process two or more corrugated sheets whose total thickness is sufficient to produce the required thickness of the finished corrugated sheet, and then pressing the sheets together, before any significant hardening or setting of the cement ingredients has occurred.
For example in producing a 6 mm thick corrugated sheet, three 2.2 mm corrugated sheets are produced on a sheet forming machine as here before described, and each sheet is corrugated separately by a corrugated device. The first sheet is placed onto a template the second sheet on top of the first, and the third sheet on wp of the second. The template is then placed in a press, the pressing surfaces of which are cornigated, the lower to fit and support the underside of the template and the upper pressing surface having a corrugated form to produce the desired corrugated surface on the upper surface of the product.
Pressure is then applied causing the three sheets to bond together and to be compressed to the desired 6 mm overall thickness. The finished corrugated sheet is then removed from the press and allbwed to set and harden in the usual way.
By corrugating sheets of 2.2 mm thickness it is possible to avoid the inward bulging of the layers of the inner surface of corrugatiolis as the difference in arc length between the inner surface layers and the outer surface layers is less than when 6 mm sheets are being corrugated.
Other methods of carrying out the pressing operation include simultaneously pressing a stack of templates, each carrying the requisite number of this corrugated sheets, or using filter media between the pressing surfaces and the product to facilitate pressing by assisting with water removal, or by using pairs of rollers having suitably shaped corrugated profiles.
Claims
1. A process for producing corrugated multi layer fibre reinforced cement sheets by first
making by the conventional process described herein, two or more precursor corrugated sheets whose total thickness is sufficient to produce the required thickness of the finished corrugated sheet, and then pressing the sheets together before any significant hardening or setting of the cement ingredients has occurred, after which provision is made for adequate hardening and setting of the multi layer corrugated sheet.
2. A process as claimed in claim 1 in which the product is reinforced by glass fibres.
3. A process as claimed in claim 1 in which the product is reinforced by cellulosic fibres.
4. A process as claimed in claim 1 in which the product is reinforced by asbestos fibres.
5. A process as claimed in claim 2 in which the glass fibre possesses resistance to alkalis.
6. A process as claimed in claims 1, 2, 3, 4 and 5 in which pressing is carried out on a press having corrugated pressing surfaces.
7. A process as claimed in claims 1, 2, 3, 4 and
5 in which a number of templates (as herein defined), each carrying the requisite number of precursor corrugated sheets to produce a finished
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A process for producing corrugated multi layer fibre reinforced cement sheets by first
making by the conventional process described herein, two or more precursor corrugated sheets whose total thickness is sufficient to produce the required thickness of the finished corrugated sheet, and then pressing the sheets together before any significant hardening or setting of the cement ingredients has occurred, after which provision is made for adequate hardening and setting of the multi layer corrugated sheet.
2. A process as claimed in claim 1 in which the product is reinforced by glass fibres.
3. A process as claimed in claim 1 in which the product is reinforced by cellulosic fibres.
4. A process as claimed in claim 1 in which the product is reinforced by asbestos fibres.
5. A process as claimed in claim 2 in which the glass fibre possesses resistance to alkalis.
6. A process as claimed in claims 1, 2, 3, 4 and 5 in which pressing is carried out on a press having corrugated pressing surfaces.
7. A process as claimed in claims 1, 2, 3, 4 and
5 in which a number of templates (as herein defined), each carrying the requisite number of precursor corrugated sheets to produce a finished sheet, are stacked and pressed simultaneously in a press.
8. A process as claimed in claims 1 to 7 in which filter media are laid under and/or over each set of precursor sheets.
9. A process as claimed in claims 1 to 5 in which the pressing is done by a pair of rollers having suitably shaped corrugated profiles.
10. A multi layer corrugated fibre reinforced cement sheet made by the processes claimed in claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903534A GB2041823A (en) | 1979-02-01 | 1979-02-01 | Improvements in and Relating to the Manufacture of Fibre Reinforced Products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7903534A GB2041823A (en) | 1979-02-01 | 1979-02-01 | Improvements in and Relating to the Manufacture of Fibre Reinforced Products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2041823A true GB2041823A (en) | 1980-09-17 |
Family
ID=10502877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7903534A Withdrawn GB2041823A (en) | 1979-02-01 | 1979-02-01 | Improvements in and Relating to the Manufacture of Fibre Reinforced Products |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2041823A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999029980A1 (en) * | 1997-12-10 | 1999-06-17 | James Hardie Research Pty. Limited | Floor/ceiling construction method |
-
1979
- 1979-02-01 GB GB7903534A patent/GB2041823A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999029980A1 (en) * | 1997-12-10 | 1999-06-17 | James Hardie Research Pty. Limited | Floor/ceiling construction method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |