NZ731046B2 - Construction panel having improved fixing strength - Google Patents
Construction panel having improved fixing strength Download PDFInfo
- Publication number
- NZ731046B2 NZ731046B2 NZ731046A NZ73104615A NZ731046B2 NZ 731046 B2 NZ731046 B2 NZ 731046B2 NZ 731046 A NZ731046 A NZ 731046A NZ 73104615 A NZ73104615 A NZ 73104615A NZ 731046 B2 NZ731046 B2 NZ 731046B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- fibres
- group
- fibers
- amount
- average length
- Prior art date
Links
- 238000010276 construction Methods 0.000 title description 2
- 239000010440 gypsum Substances 0.000 claims abstract description 29
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 29
- 239000000654 additive Substances 0.000 claims abstract description 15
- 239000011159 matrix material Substances 0.000 claims abstract description 15
- 230000000996 additive Effects 0.000 claims abstract description 9
- 239000003365 glass fiber Substances 0.000 claims description 18
- 229920002472 Starch Polymers 0.000 claims description 14
- 239000008107 starch Substances 0.000 claims description 14
- 235000019698 starch Nutrition 0.000 claims description 14
- 229920003043 Cellulose fiber Polymers 0.000 claims description 7
- 229920002678 cellulose Polymers 0.000 claims description 6
- 239000001913 cellulose Substances 0.000 claims description 6
- 239000000835 fiber Substances 0.000 abstract description 14
- 238000009434 installation Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 3
- 241000229754 Iva xanthiifolia Species 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011120 plywood Substances 0.000 description 8
- 239000004615 ingredient Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005192 partition Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- ASCUXPQGEXGEMJ-GPLGTHOPSA-N [(2R,3S,4S,5R,6S)-3,4,5-triacetyloxy-6-[[(2R,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(4-methylanilino)oxan-2-yl]methoxy]oxan-2-yl]methyl acetate Chemical compound CC(=O)O[C@@H]1[C@@H](OC(C)=O)[C@@H](OC(C)=O)[C@@H](COC(=O)C)O[C@@H]1OC[C@@H]1[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](OC(C)=O)[C@H](NC=2C=CC(C)=CC=2)O1 ASCUXPQGEXGEMJ-GPLGTHOPSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004698 Polyethylene (PE) Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 230000003115 biocidal Effects 0.000 description 1
- 239000003139 biocide Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 230000001143 conditioned Effects 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000789 fastener Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002209 hydrophobic Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/42—Glass
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/02—Cellulosic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
- C04B2111/0062—Gypsum-paper board like materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- 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
- E04C2/04—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 concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
-
- 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
- E04C2/04—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 concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/043—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 concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of plaster
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
improved panel to retain fixing means and support fixtures that do not require a time-consuming installation process, by including a mixture of fibers in the plasterboard. A plasterboard comprises a gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt% relative to the gypsum, the gypsum matrix further having a first group of fibers and a second group of fibers embedded therein, wherein the fibers of the first group of fibers have an average length that is at least three times the average length of the fibers of the second group of fibers. ive to the gypsum, the gypsum matrix further having a first group of fibers and a second group of fibers embedded therein, wherein the fibers of the first group of fibers have an average length that is at least three times the average length of the fibers of the second group of fibers.
Description
CONSTRUCTION PANEL HAVING IMPROVED FIXING STRENGTH
Field of the invention
The present invention relates to panels for use in building construction. In particular, the
present invention relates to panels for providing partitions to which items such as sinks,
televisions, or radiators may be affixed.
Background to the invention
Light-weight panels such as plasterboard (e.g. gypsum plasterboard), polystyrene board and
fibreboard are commonly used to provide partitions within buildings. Their advantages for
this application include the fact that they are light and quick to install.
However, in certain cases, such light-weight panels may have the drawback that they are not
strong enough to support fixtures (e.g. sinks, televisions, radiators, fire extinguishers, shelves
and any other item that requires attachment to the panel). In such cases, the weight of the
fixture may cause the fixing means (e.g. screws) to be pulled out of the panel, such that the
fixture falls away from the partition.
Typically, this problem has been addressed by providing plywood sheets to increase the
fixing strength of the panel. In this case, the plywood sheet is provided on the side of the
panel opposite to that on which the fixture is to be located. The plywood sheet may provide
increased strength for retaining one or more fixing means (e.g. screws) employed to secure
the fixture to the panel. Typically, the plywood sheet is positioned within the partition
framework, and the plasterboard then fixed to the plywood, so that it lies outside the partition
framework.
As an alternative, metal support means may be provided. These may comprise fixing plates,
channels, straps, or metal fasteners. As is the case for plywood sheets, the metal support
means are generally positioned on the side of the panel opposite that to which the fixture is to
be secured, and act to receive and secure fixing means, e.g. fixing screws, that are used to
attach the fixture to the panel.
Both these arrangements have the disadvantage that they require the panels and the
additional supporting components to be affixed to each other on-site. Moreover, when metal
support means are used, a plurality of such support means may be needed to support the full
set of fixing means required to secure the fixture to the panel. Thus, the installation process
may be time-consuming and expensive.
Furthermore, the addition of metal support means or plywood sheets increases the weight and
thickness of the partition, and/or results in a reduction in cavity wall space. In general, the
plywood itself must be cut to size on site, thus increasing the time required for installation
and possibly leading to the release of dust and potentially harmful components.
Therefore, there is a need to provide improved panels that are able to retain fixing means and
support fixtures, and that do not require time-consuming installation processes.
Summary of the invention
It has been found that by including a mixture of fibres in the plasterboard, an improvement in
the ability of the panel to retain fixing means may be achieved. This may allow stronger
plasterboards to be produced, or lighter plasterboards having acceptable strength.
It has also been observed that by using a mixture of fibres, the viscosity of stucco slurry may
be decreased, thereby allowing for easier manufacture of the plasterboard.
Therefore in a first aspect, the present invention may provide a plasterboard comprising a
gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt%
relative to the gypsum, the gypsum matrix further having a first group of fibres and a second
group of fibres embedded therein, wherein the fibres of the first group of fibres have an
average length that is at least three times the average length of the fibres of the second
group of fibres.
Preferably, the fibres of the first group of fibres have an average length that is at least four
times the average length of the fibres of the second group of fibres.
By including shorter fibres in addition to longer fibres, it may be possible to increase the
strength of the plasterboard, while avoiding increases in the viscosity of the stucco slurry
used to produce the board. Excessive viscosity of the slurry tends to be linked to the
formation of voids and/or the need to reduce line speeds during production in order to avoid
this.
The first group of fibres may comprise inorganic fibres, such as glass fibres. The glass fibres
typically have an average length greater than 1 mm, preferably greater than 2 mm, most
preferably greater than 3 mm. In general, the glass fibres have an average length less than 10
mm, preferably less than 8 mm.
Preferably, the glass fibres are coated with a sizing agent to increase their affinity to gypsum,
as is known in the art.
The second group of fibres may comprise organic fibres, such as cellulose-based fibres
(for example, cellulose fibres or wood fibres). The cellulose-based fibres typically have an
average length greater than 100 μm, preferably greater than 200 μm. In general, the cellulose-
based fibres have an average length less than 1.8 mm, preferably less than 1 mm,
most preferably less than 800 μm. In general, the thickness of the cellulose-based fibres is
greater than 10 μm, preferably greater than 20 μm. Typically, the thickness of the cellulose-
based fibres is less than 60 μm, preferably less than 40 μm.
The apparent density of the cellulose-based fibres before incorporation into the gypsum
product is typically less than 250g/L.
In other embodiments, the organic fibres may be e.g. polyethylene, polypropylene, or
polyester fibres.
Typically, the fibres of the first group of fibres have an average length that is greater than 1
mm, preferably greater than 2 mm, most preferably greater than 3 mm. In general, the fibres
of the first group of fibres have an average length that is less than 10 mm, preferably less than
8 mm.
The fibres of the second group of fibres typically have an average length greater than 100 μm,
preferably greater than 200 μm. In general, the fibres of the second group of fibres have an
average length less than 1.8 mm, preferably less than 1 mm, more preferably less than 800
μm.
In general, the thickness of the fibres of the second group of fibres is greater than 10 μm,
preferably greater than 20 μm. Typically, the thickness of the fibres of the second group of
fibres is less than 60 μm, preferably less than 40 μm.
In general, the first and second groups of fibres are present in a total amount that is less than
wt% relative to the gypsum matrix, preferably less than 15 wt%, more preferably less than
wt%.
Preferably, the polymeric additive is distributed in the gypsum matrix in an amount of at least
2 wt%, most preferably at least 3 wt%.
Typically, the polymeric additive is a starch. Preferably, the polymeric additive is present in
an amount of less than 20 wt% relative to the gypsum matrix, preferably less than 15 wt%.
In certain embodiments of the first aspect of the invention, the plasterboard has paper
facings. These paper facings may comprise both cellulose fibres and glass fibres, as this is
thought to improve the fire resistance of the plasterboard. In other cases, the plasterboard may
have a mat partially or fully embedded at its surface, for example, a glass mat.
In certain embodiments of the first aspect of the invention, the gypsum matrix comprises a
hydrophobic additive, such as silicone oil or wax.
In certain embodiments of the first aspect of the invention, the gypsum matrix may contain a
biocide.
In certain embodiments of the first aspect of the invention, the gypsum matrix may contain an
anti-shrinkage agent such as unexpanded vermiculite, microsilica, and/or clay, in order to
improve the fire-resistance of the product.
Certain embodiments of the first aspect of the invention may include foam or lightweight
aggregate such as perlite. Such additives are known in the art to produce lower-density
boards having acceptable thickness.
Detailed description
The invention will now be described by way of example only.
Gypsum plasterboards were prepared using the following general methodology:
Stucco and other dry additives were weighed into a bag and shaken to mix them. Water and
wet additives were weighed into a bowl. The fibres were weighed, added to the wet
additives in the bowl, and mixed together using an electric mixer for 30 s.
The dry powdered additives were added to the wet additives in the bowl and mixed in with
the electric mixer for 30 s.
The resultant slurry was sandwiched between two sheets of boardline paper and allowed to
hydrate for 25 minutes measured from the time of mixing. The board was then dried in an
oven for 50 minutes at 180°C with a relative humidity greater than 80%.
Example 1
A gypsum plasterboard was prepared from the following ingredients:
• stucco;
• ethylated starch in an amount of 5wt% relative to the amount of stucco (the starch is
available from Grain Processing Corporation under the trade name Coatmaster
K57F);
• glass fibre in an amount of 5wt% relative to the amount of stucco. The glass fibres
had an average length of 6 mm;
• cellulose fibre in an amount of 2 wt% relative to the amount of stucco. The cellulose
fibres had an average length of 500 micron and an average diameter of 35 micron.
Example 2
A gypsum plasterboard was prepared from the following ingredients:
• stucco;
• ethylated starch in an amount of 10wt% relative to the amount of stucco (the starch is
available from Grain Processing Corporation under the trade name Coatmaster K57F);
• glass fibre in an amount of 5wt% relative to the amount of stucco. The glass fibres
had an average length of 6 mm;
• cellulose fibre in an amount of 5 wt% relative to the amount of stucco. The cellulose
fibres had an average length of 500 micron and an average diameter of 35 micron.
Comparative example 1
A gypsum plasterboard was prepared from the following ingredients:
• stucco;
• ethylated starch in an amount of 5wt% relative to the amount of stucco (the starch is
available from Grain Processing Corporation under the trade name Coatmaster
K57F);
• glass fibre in an amount of 5wt% relative to the amount of stucco. The glass fibres
had an average length of 6 mm.
Comparative example 2
A gypsum plasterboard was prepared from the following ingredients:
• stucco;
• ethylated starch in an amount of 10wt% relative to the amount of stucco (the starch is
available from Grain Processing Corporation under the trade name Coatmaster
K57F);
• glass fibre in an amount of 5wt% relative to the amount of stucco. The glass fibres
had an average length of 6 mm.
Comparative example 3
A gypsum plasterboard was prepared from the following ingredients:
• stucco;
• starch in an amount of 6wt% relative to the amount of stucco (the starch is available
from Tate & Lyle under the trade name Merifilm);
• glass fibre in an amount of 2wt% relative to the amount of stucco. The glass fibres
had an average length of 6 mm.
Comparative example 4
A gypsum plasterboard was prepared from the following ingredients:
• stucco;
• starch in an amount of 6wt% relative to the amount of stucco (the starch is available
from Tate & Lyle under the trade name Merifilm);
• glass fibre in an amount of 1wt% relative to the amount of stucco. The glass fibres
had an average length of 6 mm;
• polypropylene fibre in an amount of 1 wt% relative to the amount of stucco. The
polypropylene fibres had an average length of 6mm.
Screw pull-out strength
Screw pull-out tests were carried out on samples measuring 100mm by 100mm that had been
conditioned at a temperature of 23°C and a relative humidity of 50%. A 50mm single thread
wood screw was inserted into the sample, passing through a metal load transfer element
positioned on the surface of the sample. The load transfer element has a first portion that is
configured to lie between the screw head and the surface of the sample, and a second portion
that is configured to engage with a testing machine so as to allow a load to be applied to the
screw along the axis of the screw. The screw was tightened to a torque of 1Nm.
The specimen was then mounted in a Zwick Universal Testing Machine and a 10N pre-load
applied to the screw along the axis of the screw. Subsequently, the load was increased by
setting a constant cross-head speed of 10mm/minute until pull out was achieved.
The results are set out in Table 1. These are averages, each taken from 8 samples.
Table 1
Example Average screw pull-out strength
Example 1 494.9
Comparative example 1 305.1
Example 2 671.0
Comparative example 2 535.5
Comparative example 3 574
Comparative example 4 558
In compliance with the statute, the invention has been described in language more or less
specific to structural or methodical features. The term “comprises” and its variations, such as
“comprising” and “comprised of” is used throughout in an inclusive sense and not to the
exclusion of any additional features.
It is to be understood that the invention is not limited to specific features shown or described
since the means herein described comprises preferred forms of putting the invention into
effect.
The invention is, therefore, claimed in any of its forms or modifications within the proper
scope of the appended claims appropriately interpreted by those skilled in the art.
Claims (9)
1. A plasterboard comprising a gypsum matrix having a polymeric additive distributed therein in an amount of at least 1 wt% relative to the gypsum, the gypsum matrix further having a first group of fibres and a second group of fibres embedded therein, wherein the 5 fibres of the first group of fibres have an average length that is at least three times the average length of the fibres of the second group of fibres.
2. A plasterboard according to claim 1, wherein the fibres of the first group of fibres have an average length in the range of 2-10 mm.
3. A plasterboard according to claim 1 or claim 2, wherein the first and second groups of fibres are present in a total amount that is less than 20wt% relative to the gypsum matrix.
4. A plasterboard according to any one of the preceding claims, wherein the first group of 15 fibres comprises glass fibres.
5. A plasterboard according to any one of the preceding claims, wherein the second group of fibres comprises cellulose fibres. 20
6. A plasterboard according to claim 5, wherein the cellulose-based fibres have a length in the range of 200 micron to 1.8 mm.
7. A plasterboard according to claim 5 or claim 6, wherein the cellulose-based fibres have a thickness in the range of 20-60 micron.
8. A plasterboard according to any one of the preceding claims, wherein the polymeric additive is starch.
9. A plasterboard according to any one of the preceding claims, wherein the polymeric additive is present in an amount of less than 20 wt% relative the gypsum matrix.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB1420676.7A GB201420676D0 (en) | 2014-11-20 | 2014-11-20 | Construction panel having improved fixing strength |
GB1420676.7 | 2014-11-20 | ||
PCT/GB2015/053536 WO2016079529A1 (en) | 2014-11-20 | 2015-11-19 | Construction panel having improved fixing strength |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ731046A NZ731046A (en) | 2021-01-29 |
NZ731046B2 true NZ731046B2 (en) | 2021-04-30 |
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