GB2201175A - Compressed straw panels with paper facing - Google Patents
Compressed straw panels with paper facing Download PDFInfo
- Publication number
- GB2201175A GB2201175A GB08803629A GB8803629A GB2201175A GB 2201175 A GB2201175 A GB 2201175A GB 08803629 A GB08803629 A GB 08803629A GB 8803629 A GB8803629 A GB 8803629A GB 2201175 A GB2201175 A GB 2201175A
- Authority
- GB
- United Kingdom
- Prior art keywords
- compressed straw
- straw
- compressed
- bonded
- core
- 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.)
- Granted
Links
- 239000010902 straw Substances 0.000 title claims abstract description 40
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 11
- 230000001070 adhesive effect Effects 0.000 claims abstract description 11
- 239000003365 glass fiber Substances 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 abstract description 6
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 238000005192 partition Methods 0.000 abstract description 2
- 150000001639 boron compounds Chemical class 0.000 description 12
- 239000000843 powder Substances 0.000 description 9
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920001807 Urea-formaldehyde Polymers 0.000 description 7
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical compound O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910021538 borax Inorganic materials 0.000 description 4
- 239000002917 insecticide Substances 0.000 description 4
- 235000010339 sodium tetraborate Nutrition 0.000 description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- RDMZIKMKSGCBKK-UHFFFAOYSA-N disodium;(9,11-dioxido-5-oxoboranyloxy-2,4,6,8,10,12,13-heptaoxa-1,3,5,7,9,11-hexaborabicyclo[5.5.1]tridecan-3-yl)oxy-oxoborane;tetrahydrate Chemical compound O.O.O.O.[Na+].[Na+].O1B(OB=O)OB(OB=O)OB2OB([O-])OB([O-])OB1O2 RDMZIKMKSGCBKK-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 230000000749 insecticidal effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical group [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000004079 fireproofing Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/10—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
- E04C2/16—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of fibres, chips, vegetable stems, or the like
- E04C2/18—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products of fibres, chips, vegetable stems, or the like with binding wires, reinforcing bars, or the like
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
A panel 1, for example for partitions in the interior of buildings or for packaging, comprises a flat, rectangular section core 4 of compressed straw covered with a paper liner 2 bonded to its outer surfaces by means of a melamine formaldehyde containing adhesive. A glass fibre mesh 3 is bonded into the interface between the two principal faces of the compressed straw core 4 and the paper liner 2. <IMAGE>
Description
COMPRESSED STRAW ELEMENTS
The invention relates to elements, including structural members such as building panels, made of compressed straw.
Compressed straw panels comprising a compressed straw core bonded to a paper liner by means of an urea formaldehyde resin are known. Such compressed straw panels, under adverse conditions, are liable to absorb moisture, to distort or deflect under ioad, and to harbour insects.
According to a first aspect of tne invention, an element comprises compressed straw mixed with an insecticidal boron compound. It is found that certain boron compounds are especially useful as insecticides in compressed straw panels, for example, and further that certain of these insecticides have the added advantage of acting as fire-proofing agents.
The boron compound is preferably in powder form, and is preferably mixed in a proportion of 0.18 to 5e active ingredient by weight of the mixture.
The boron compound may be boric acid, but is preferably a sodium borate such as disodium octaborate tetrahydrate or, alternatively, borax.
A method of making such an element comprises mixing straw with an insecticidal boron compound and compressing the mixture.
Where the boron compound is a powder it is preferably mixed by sprinkling the powder over the straw, but may be mixed by passing the straw through a cloud of the powder.
Alternatively, the boron compound may be mixed as a solution with the straw, either by spraying the straw with the solution or by dipping the straw in the solution. Such a solution may comprise aqueous boric acid, or a sodium borate in water or an organic solvent.
According to a second aspect, the invention provides a compressed straw element having a paper liner bonded to a compressed straw core by means of an adhesive, and a reinforcing mesh at the interface of the core and the liner.
The reinforcing mesh, which is preferably of glass fibre but may alternatively be of plastics, mineral, metal, cotton or hessian, imparts an improved tensile strength to the surfaces of the element which is preferably a compressed straw panel, and thus reduces the risk of deflection and expansion or contraction of the element under varying loads and environmental conditions.
According to a third aspect, the invention provides a compressed straw element having a paper liner bonded to a compressed straw core by means of an adhesive comprising a melamine formaldehyde resin. It is found that an adhesive of melamine formaldehyde resin has improved resistance to water over the more conventional resin of urea formaldehyde alone. The melamine formaldehyde resin may be mixed with another resin such as urea formaldehyde.
Preferably, the compressed straw element in accordance with the first aspect of the invention also has the reinforcing mesh in accordance with the second aspect of the invention, and/or the adhesive comprising melamine formaldehyde in accordance with the third aspect ofS-the invention.
In order that the invention may be better understood, a preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying diagrammatic drawing of a compressed straw panel.
A panel 1, for example for partitions in the interior of buildings or for packaging, comprises a flat, rectangular section core 4 of compressed straw covered with a paper liner 2 bonded to its outer surfaces by means of an adhesive. In order to strengthen the panel and reduce the risk of deflection and differential movement of the panel surfaces due to changing environmental conditions and mechanical loads, a glass fibre mesh 3 is bonded into the interface between the two principal faces of the compressed straw core 4 and the paper liner 2. The glass fibre mesh 3 is bonded by the same layer of adhesive which bonds the paper liner 2 onto the compressed straw board 4.
Typical glass fibre meshes are from 3 to 30 grams per square metre in density, formed in an open mesh arrangement with the glass fibre threads forming warps and wefts with between 0.2 and 2 threads per cm in each direction. Each thread is formed of one or more yarns, each yarn being typically from 20 to 100 grams in weight per 1000 metres in length.
The glass fibre mesh is found to be particularly effective. Firstly, it has a high tensile strength and a low elasticity, contributing to the strength of the panel 1. Secondly, the glass fibre mesh has excellent properties of moisture and fire resistance. However, other forms of mesh could be formed, for example from plastics, mineral, metal, cotton or hessian.
The adhesive could be a thermosetting resin of conventional type, for example of urea formaldehyde.
However, it is found that the best resin for this purpose, with optimum resistance to water and optimum bond strength, is a resin of melamine formaldehyde.
However, melamine formaldehyde is more expensive than urea formaldehyde, and it is preferred to use a mixture of the two. In one example, the resin adhesive consists of 100 parts by weight urea formaldehyde liquid resin with 15 parts by weight liquid melamine formaldehyde resin with up to 100 parts by weight of fillers, water and catalysts (hardener). The proportion of melamine formaldehyde is not
critical; optimal properties are obtained with 100% melamine formaldehyde as the resin, but significant
benefits are still obtained where the proportion lies
in the range of 5 to 30 parts by weight to 100 parts of
urea formaldehyde.
The compressed straw panel comprises a mixture of compressed straw and a boron compound which acts as an
insecticide and as a fire-proofing agent. The boron compound may be mixed as aqueous boric acid
(H3BO3), disodium octaborate tetrahydrate
(Na2B8013 4H2O approx.) or Borax
(Na2B407 10H2O) in water or an organic solvent.
Such a solution is mixed with the straw before -compression by spraying the solution onto the straw or by dipping the straw into the solution.
Alternatively, the boron compound, which may be any of the compounds listed- above, is mixed dry as a powder, optionally mixed with a suitable powder diluent, either by sprinkling the powder onto the straw
from a vibrator feeder, for example, or by passing the straw through a cloud of the powder supplied under compressed air.
Whether the boron compound is mixed as a solution or as a powder, a typical dosage rate of the active
ingredient is in the range from 0.1% to 5% by weight of the mixture.
It has been found that boron compounds, in particular those identified above, are particularly advantageous as insecticides and fire-proofing agents for compressed straw panels, are inexpensive and are easily and safely applied.
Although the invention has been illustrated with reference to a flat, rectangular section panel, it is envisaged that the invention would be equally applicable to any structural member of compressed straw, for example, bricks and tiles and structural members of irregular shapes, and to other compressed straw elements such as are used for packaging.
Claims (3)
1. A compressed straw element having a paper liner bonded to a compressed straw core by means of an adhesive and a reinforcing mesh at the interface of the core and the liner.
2. An element as claimed in Claim 1 wherein the mesh is of glass fibre, plastics, mineral fibre, metal, cotton or hessian.
3. A compressed straw element as claimed in Claim 1 or 2 wherein the paper liner is bonded to the compressed straw core by means of an adhesive comprising a melamine formaldehyde resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8803629A GB2201175B (en) | 1986-06-10 | 1988-02-17 | Compressed straw elements |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8614023A GB2191516B (en) | 1986-06-10 | 1986-06-10 | Manufacture of building panels. |
| GB8803629A GB2201175B (en) | 1986-06-10 | 1988-02-17 | Compressed straw elements |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8803629D0 GB8803629D0 (en) | 1988-03-16 |
| GB2201175A true GB2201175A (en) | 1988-08-24 |
| GB2201175B GB2201175B (en) | 1989-12-13 |
Family
ID=26290890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8803629A Expired GB2201175B (en) | 1986-06-10 | 1988-02-17 | Compressed straw elements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2201175B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998025002A1 (en) * | 1996-12-06 | 1998-06-11 | Agro Biomass Consult Aps | Method for production of cores for doors, partitions, furniture and the like, and such cores |
| US6263629B1 (en) | 1998-08-04 | 2001-07-24 | Clark Schwebel Tech-Fab Company | Structural reinforcement member and method of utilizing the same to reinforce a product |
| WO2001081056A1 (en) * | 2000-04-27 | 2001-11-01 | Mura Imre Jr | Reinforced particle board and method for manufacturing thereof |
| US6667350B1 (en) | 2002-10-17 | 2003-12-23 | Plymouth Foam, Incorporated | Calcium borate infused foam building materials and the like and method of making same |
| US6701683B2 (en) | 2002-03-06 | 2004-03-09 | Oldcastle Precast, Inc. | Method and apparatus for a composite concrete panel with transversely oriented carbon fiber reinforcement |
| US6729090B2 (en) | 2002-03-06 | 2004-05-04 | Oldcastle Precast, Inc. | Insulative building panel with transverse fiber reinforcement |
| US6898908B2 (en) | 2002-03-06 | 2005-05-31 | Oldcastle Precast, Inc. | Insulative concrete building panel with carbon fiber and steel reinforcement |
| AT413998B (en) * | 2000-08-31 | 2006-08-15 | Passauer Walter | STRAW insulating |
| US7100336B2 (en) | 2002-03-06 | 2006-09-05 | Oldcastle Precast, Inc. | Concrete building panel with a low density core and carbon fiber and steel reinforcement |
| ES2299391A1 (en) * | 2006-11-14 | 2008-05-16 | Andoni Murua Etxabe | Method for obtaining structural component, involves adding polymerized resins to part of sawdust of small particle size that interact with agglomerate block |
| US7627997B2 (en) | 2002-03-06 | 2009-12-08 | Oldcastle Precast, Inc. | Concrete foundation wall with a low density core and carbon fiber and steel reinforcement |
-
1988
- 1988-02-17 GB GB8803629A patent/GB2201175B/en not_active Expired
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998025002A1 (en) * | 1996-12-06 | 1998-06-11 | Agro Biomass Consult Aps | Method for production of cores for doors, partitions, furniture and the like, and such cores |
| US6399214B1 (en) * | 1996-12-06 | 2002-06-04 | Agro Biomass Consult Aps | Method for production of cores for doors, partitions, furniture and such cores |
| US6263629B1 (en) | 1998-08-04 | 2001-07-24 | Clark Schwebel Tech-Fab Company | Structural reinforcement member and method of utilizing the same to reinforce a product |
| WO2001081056A1 (en) * | 2000-04-27 | 2001-11-01 | Mura Imre Jr | Reinforced particle board and method for manufacturing thereof |
| AT413998B (en) * | 2000-08-31 | 2006-08-15 | Passauer Walter | STRAW insulating |
| US6729090B2 (en) | 2002-03-06 | 2004-05-04 | Oldcastle Precast, Inc. | Insulative building panel with transverse fiber reinforcement |
| US6701683B2 (en) | 2002-03-06 | 2004-03-09 | Oldcastle Precast, Inc. | Method and apparatus for a composite concrete panel with transversely oriented carbon fiber reinforcement |
| US6898908B2 (en) | 2002-03-06 | 2005-05-31 | Oldcastle Precast, Inc. | Insulative concrete building panel with carbon fiber and steel reinforcement |
| US7100336B2 (en) | 2002-03-06 | 2006-09-05 | Oldcastle Precast, Inc. | Concrete building panel with a low density core and carbon fiber and steel reinforcement |
| US7627997B2 (en) | 2002-03-06 | 2009-12-08 | Oldcastle Precast, Inc. | Concrete foundation wall with a low density core and carbon fiber and steel reinforcement |
| US6667350B1 (en) | 2002-10-17 | 2003-12-23 | Plymouth Foam, Incorporated | Calcium borate infused foam building materials and the like and method of making same |
| ES2299391A1 (en) * | 2006-11-14 | 2008-05-16 | Andoni Murua Etxabe | Method for obtaining structural component, involves adding polymerized resins to part of sawdust of small particle size that interact with agglomerate block |
| ES2299391B1 (en) * | 2006-11-14 | 2009-04-01 | Andoni Murua Etxabe | PROCESS OF OBTAINING A CONSTRUCTION ELEMENT, AND PRODUCTS OBTAINED IN THIS PROCESS. |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2201175B (en) | 1989-12-13 |
| GB8803629D0 (en) | 1988-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990610 |