U.S. patent application number 11/664093 was filed with the patent office on 2008-05-08 for mineral fibre insulation board.
Invention is credited to Ebbe Jartved, Preben Riis.
Application Number | 20080104919 11/664093 |
Document ID | / |
Family ID | 39358500 |
Filed Date | 2008-05-08 |
United States Patent
Application |
20080104919 |
Kind Code |
A1 |
Riis; Preben ; et
al. |
May 8, 2008 |
Mineral Fibre Insulation Board
Abstract
A mineral fibre board having at least two resilient edges in
order to prevent any small gaps in the joints between two adjacent
boards when these are installed. The purpose of the invention is to
improve the effect of the insulation layer and thereby either
reducing the heat loss to a minimum in order to comply with new
standards for low energy consumption buildings or to improve the
fire properties of a fire protection insulation layer on e.g. steel
constructions. The invention also concerns a method for producing
the mineral fibre board by mechanical compression by rollers.
Inventors: |
Riis; Preben; (Roskilde,
DK) ; Jartved; Ebbe; (Copenhagen, DK) |
Correspondence
Address: |
FINNEGAN, HENDERSON, FARABOW, GARRETT & DUNNER;LLP
901 NEW YORK AVENUE, NW
WASHINGTON
DC
20001-4413
US
|
Family ID: |
39358500 |
Appl. No.: |
11/664093 |
Filed: |
September 29, 2005 |
PCT Filed: |
September 29, 2005 |
PCT NO: |
PCT/DK05/00618 |
371 Date: |
October 22, 2007 |
Current U.S.
Class: |
52/506.01 ;
52/741.3 |
Current CPC
Class: |
E04B 1/80 20130101; E04B
2001/7695 20130101 |
Class at
Publication: |
52/506.01 ;
52/741.3 |
International
Class: |
E04B 1/80 20060101
E04B001/80 |
Claims
1-18. (canceled)
19. A mineral fibre insulation board comprising mineral fibres and
a binder, said board having two major surfaces being approximately
parallel to each other and four minor surfaces forming the side
surfaces of the insulation board, where at least two of the minor
surfaces each represents a surface of a zone of the board being
resilient to a greater extent than the remaining part of the board
and extending a distance into the insulation board, said zone being
resilient to such an extent as to prevent substantially any gaps to
neighboring boards when compressed against these during
installation and said board having a density of more than 60
kg/m.sup.3, wherein only two minor surfaces are provided with said
zone, said two surfaces having one corner in common.
20. A mineral fibre insulation board according to claim 19, said
greater resiliency being such that the zone is compressible by
hand.
21. A mineral fibre insulation board according to claim 19, wherein
said zone extends for a distance into the insulation board measured
perpendicularly to said minor surface of at least 5 mm.
22. A mineral fibre insulation board according to claim 19, wherein
said zone extends for a distance into the insulation board measured
perpendicularly to said minor surface of no more than 50 mm along
the entire length, or the major length, of said minor surface.
23. A mineral fibre insulation board according to claim 19, wherein
the insulation board comprises at least two layers of mineral fibre
insulation having different densities and extending parallel with
said major surface.
24. An insulating construction comprising an inner surface against
which one layer of insulation boards is installed and fastened by
fastening means and an outer covering layer wherein the insulation
layer comprises one layer of insulation boards according to claim
19.
25. An insulating construction according to claim 24, wherein the
insulation boards are fastened by mechanical means.
26. An insulating construction according to claim 25, wherein the
fastening means is placed along parts of the edges of the
insulation boards.
27. An insulating construction according to claim 24, wherein the
outer covering layer is chosen from metal foil, render, wood,
etemit, compressed mineral fibre boards, paint, and fleece, and
mixtures thereof.
28. An insulating construction according to claim 24, wherein there
is an open space where air may circulate between the insulation
layer and the outer covering layer.
29. An insulating construction according to claim 24, wherein the
inner surface is the facade of a building.
30. An insulating construction according to claim 24, wherein the
inner surface is a steel construction.
31. A method for producing a mineral fibre insulation board for
heat, sound, or fire insulation comprising mineral fibres and a
binder, said board having two major surfaces being approximately
parallel to each other, and having four minor surfaces where at
least two minor surfaces represent a surface of a resilient zone of
the board wherein said mineral fibre insulation having a density of
at least 60 kg/m.sup.3 and the method comprises the following
steps: (a) mixing mineral fibres and a binder into a web; (b)
curing the binder; and (c) providing two of said minor surfaces
that have one corner in common, with a resilient zone by a
mechanical treatment comprising that the boards pass a zone where
rollers compress said two minor surfaces to make the board more
resilient in that zone.
32. A method according to claim 31, wherein only one board passes
the said zone with rollers at a time.
33. A method according to claim 31, wherein the board is supported
on the majority of its top surface while passing the zone with
rollers.
34. A method according to claim 31, wherein more than one roller is
applied and the rollers extend different distances into the minor
surface of the board.
35. A mineral fibre insulation board according to claim 19, wherein
said board having a density of more than 70 kg/m.sup.3.
36. A mineral fibre insulation board according to claim 19, wherein
said board having a density of more than 80 kg/m.sup.3.
37. A mineral fibre insulation board according to claim 19, wherein
said two minor surfaces are perpendicular to each other.
38. A mineral fibre insulation board according to claim 21, wherein
said zone extends for a distance into the insulation board measured
perpendicularly to said minor surface of at least 8 mm.
39. A mineral fibre insulation board according to claim 22, wherein
said zone extends for a distance into the insulation board measured
perpendicularly to said minor surface of no more than 30 mm, along
the entire length, or the major length, of said minor surface.
40. A mineral fibre insulation board according to claim 22, wherein
said zone extends for a distance into the insulation board measured
perpendicularly to said minor surface of no more than 20 mm, along
the entire length, or the major length, of said minor surface.
41. An insulating construction according to claim 30, wherein the
steel construction is a load carrying steel construction which
needs to be fire protected.
42. A method for producing a mineral fibre insulation board for
heat, sound, or fire insulation according to claim 31, wherein the
two of said minor surfaces are perpendicular to each other.
43. A method according to claim 34, wherein a first roller extends
a shorter distance into the board than a following roller.
Description
[0001] The invention concerns a mineral fibre board of relatively
high density for heat, sound or fire insulation. The board has at
least two resilient minor side surfaces in order to prevent any
small gaps in the joints between two adjacent boards. The purpose
of the invention is to improve the effect of the insulation layer
and thereby either reducing the heat loss to a minimum in order to
comply with new standards for low energy consumption buildings or
to improve the fire properties of a fire protection insulation
layer on e.g. steel constructions. The invention also concerns a
method for producing the mineral fibre board and a method for
installing the boards.
[0002] It is known to manufacture and use mineral wool insulation
boards with at least one resilient edge for e.g. between rafter
insulation in buildings. Methods for manufacturing such a board has
been described in DE 32 03 622 and in U.S. Pat. No. 5,213,885. The
purpose has been to make the insulation adjust easily to
differences in the distances between rafters or beams in order to
avoid cutting the board into the correct size at the building site.
This will save time and reduce the insulation workers exposure to
airborne mineral fibres considerably. Mineral wool insulation for
this purpose would typically have densities in the range 20-35
kg/m.sup.3.
[0003] For some purposes e.g. external facade insulation or fire
protection of steel constructions, higher densities of the
insulation boards are used compared to standard building
insulation, e.g. insulation between the rafters. This higher
density gives a higher strength and mechanical stability of the
insulation board, and it is prevented that the insulation could
buckle out from the surface to which it is attached in the area
between the fasteners.
[0004] The increased focus on high energy efficient insulation of
buildings due to the increased costs for energy and concerns about
environmental issues has revealed that it is not enough to increase
the thickness and the insulation properties of the insulation
layer. It is also necessary to optimise the way the insulation is
installed. It is essential for an effective insulation to minimise
cold bridges, e.g. the fasteners for the insulation, and to avoid
any gaps between the insulation boards. According to ISO 6946
(1997) it is necessary to compensate for possible gaps between the
insulation boards by using a thicker insulation layer. This will
obviously increase the use of insulation material thereby
increasing the costs of the building without gaining a better
overall heat insulation.
[0005] Until now there are only two ways to avoid gaps between the
insulation boards. The first is to have more than one layer of
insulation installed so that the spaces between the boards in the
e.g. two layers of boards do not over-lap. This method will make
the insulation more time consuming to install. The second method is
to give the edges of the boards a shape or profile which will
prevent an open access to the insulated surface along a straight
line perpendicular to the surface against which the insulation is
placed. This shape or profile could be groove and tongue like. This
method will make each insulation board more expensive to produce,
primarily because the production will have a higher waste of
mineral wool.
[0006] The present invention has solved the above mentioned
problems by making at least two of the minor side surfaces on a
high density mineral fibre insulation board resilient, i.e. more
elastically compressible than the rest of the board. This has not
been done before for mineral fibre insulation densities
considerably higher than densities used for standard building
insulation, e.g. between rafter insulation below the roof of a
building. It has furthermore been found that it is possible to
manufacture such boards.
[0007] It has not been obvious to make resilient minor side
surfaces in mineral fibre insulation boards for e.g. facade
insulation, external roof insulation, fire and heat insulation for
marine purposes since it has been essential to have a hard and
non-compressible insulation board for these purposes. The specific
need for a hard, stable and non-compressible insulation board for a
number of purposes has been the main reason for manufacturing these
boards at higher densities and thereby higher costs than what would
typically be used for insulation inside buildings, e.g. between
rafter insulation.
[0008] By resilient minor side surfaces according to the invention
minor side surfaces are understood, which are easily compressible
by hand, and which are elastically compressible in such a way that
removing the compression will make the minor side surface of the
board regain substantially its original dimension, however minor
deviations from its original dimension should be expected. The rest
of the board away from the resilient surfaces has a higher
stiffness. The stiffness may be defined according to EN826.
Preferably, the whole minor surface should be substantially equally
resilient.
[0009] In the manufacturing it is more difficult to make resilient
minor side surfaces when the density of the mineral fibre
insulation board is increased. A higher force on the rollers
compressing the minor side surfaces of the insulation board is
needed. This will make it more difficult to let the board or stack
of boards pass a station for manufacturing of resilient minor side
surfaces. This problem has been solved by the inventive method also
claimed. The method is to let one board or a stack of boards pass
two zones i.e. two compression stations with rollers on one side of
the conveyor and a smooth conveyor surface on the opposite side of
the rollers for holding the stack of boards in position. Due to the
high density of the boards a high compression force by the rollers
is necessary, and therefore the smooth conveyor surface is
necessary for securing a well-defined position of the board or
stack of boards on the main conveyor band on which the board or
stack of boards is moved. The well-defined position of the board or
stack of boards is important for obtaining a specific depth of the
resilient zone.
[0010] The high compression force by the rollers will often make
boards bend. This problem may be solved by letting only one board
pass the station at a time and supporting the board on its top
major surface while passing the zones (the same zone could be
passed more than once). This support could be in the form of a
conveyor band covering the majority of the top surface. The support
could also be in the form of a smooth surface. This support will
prevent the board from bending due to the compression force. Any
bending of the board during the compression will mean that the
resilient zone will not get the specified depth. Furthermore,
bending may cause de-lamination of the board, especially when the
board is a dual density board.
[0011] The inventive mineral fibre insulation board will have the
advantage that the resilient minor side surfaces will compensate
for the tolerances of the boards. These tolerances are often in the
millimetre range, and are present in both the width and length of
the board and in the angles of the board resulting in deviations
from a purely rectangular box shape. The tolerances are due to the
fast cutting out the boards from the mineral fibre web moving on
the conveyor line. The tolerances will often be in the range up to
5 mm and sometimes even up to 8 mm. This means in practice that
there might be difference in the width or length of a board of 5 mm
from one end to the other in the width or length direction. These
tolerances will lead to small gaps between a numbers of the boards
on a facade when traditional boards without resilient minor side
surfaces are used. The resilient minor side surfaces will make it
possible to press the boards together by hand when installing the
boards and by compressing the minor side surfaces slightly the
elastically compressible zone will fill out any gaps between the
boards.
[0012] Due to these tolerances the resilient zone do not need to
extend for a distance into the insulation board measured
perpendicularly to the minor surface of no more than 50 mm,
preferably no more than 30, and even more preferably no more than
20 mm, along the entire length, or the major length, of said minor
surface.
[0013] Also when installing insulation boards on a non planar
surface the resilient minor side surfaces will help to avoid that
two boards which are bended relative to each other (meaning that
there is an angle between the planes of the major surfaces of the
two boards larger than 0 degrees) will only touch each other along
one thin line, resulting in a poor insulation along this line. A
non planar surface could be the case when renovating the facades of
old buildings.
[0014] There are different methods for fastening the type of
insulation boards described by the invention. One possibility is
mechanical fixings like steel pins which in the case of external
wall insulation may be hammer driven or fastened in drilled holes.
In the case of fire insulation of metal constructions the steel
pins may be stud welded through the insulation board as described
in WO 03/086697. Some kind of head for holding the insulation is
placed on the pin before or after fixation of the pin.
[0015] The inventive mineral fibre insulation board will be
especially advantages when fasteners placed between two
neighbouring boards are applied. It will be easy to push the two
boards closely together so that the elastically compressible zone
will close any gap around the fastener and thereby avoiding that
the fastener may create a small air gap between the two insulation
boards, which otherwise often would be the case, because the boards
due to the fastener cannot be pushed closely together. The same
will be the case when fasteners for the external wall cladding are
placed between the insulation boards.
[0016] For several purposes it may be advantageous to make the
inventive mineral fibre insulation board from a dual density or
triple density mineral fibre product. A dual density insulation
board will have two closely connected layers of mineral fibres
where the density of the one layer is different from the density of
the other. Typically the layer with the highest density will make
up the smallest fraction of the total thickness of the insulation
board. This would be beneficial in the case of building facade
insulation where a higher density of the outer layer of the
insulation would make the insulation layer more resistant to
mechanical damages during installation of the outer visible surface
layer on the facade. If the outer layer is a render layer applied
directly to the surface of the mineral fibre insulation layer a
high insulation density in the surface will be preferable.
[0017] For especially roof insulation triple density as described
in WO0073600 is also relevant for this invention
[0018] For manufacturing a mineral fibre board with elastically
compressible minor side surface or edge surfaces it must be
realised that mineral fibre insulation comprises a large number of
individual fibres having different lengths and diameters. For
providing a stable mineral fibre board a binder, e.g. in the form
of drops of a thermosetting resin, is added to the mineral fibres.
Said binder is cured in a curing oven and will thereafter make the
fibres stick to each other at the points where the fibres are in
contact with each other. A method for making one or more minor side
surface surfaces of this mineral fibre insulation board elastically
compressible is to compress one or more rollers a distance into the
minor side surface or edge surface. This compression by the roller
will break some of the points of binding in the mineral fibre board
and thereby make the edge portion of the mineral fibre board softer
and more elastically compressible than the rest of the board. The
diameter of the compression applying roller(s) must be relatively
small in order to concentrate the compression forces in the desired
region. The diameter is usually 200-500 mm. The rollers are pressed
a distance of 15-50 mm, preferably 20-30 mm into the edge. The
numbers of rollers would often be 1-7, preferably 2-4.
[0019] For boards of a high density the first roller will be
pressed a shorter distance into the board than the following
rollers. Usually there will be an increase of the distance by which
the roller is pressed into the board from roller to roller, also
when several rollers are applied. The distances will be dependent
on the density of the board and if it is a dual density or mono
density board.
[0020] The strength and the mechanical stability of the mineral
fibre board are not only related to the density of the board but
also to the binder content. Therefore, the elasticity of the edge
portions should be seen in relation to the overall elasticity of
the board. The binder content of the board according to the
invention is at least 2%, preferably at least 3%, and even more
preferably at least 4%. When the boards are intended for fire
protection purposes the binder content may be down to 0.8%,
preferably down to 1.4%.
[0021] The fibre orientation will usually be substantially parallel
to the major surfaces of the board when boards of one mono density
are applied. If the board is a dual density the fibre orientation
will be more complex.
[0022] The invention concerns a mineral fibre insulation board for
heat, sound or fire insulation comprising mineral fibres and a
binder, said board having two major surfaces being approximately
parallel to each other, and having four minor surfaces forming the
side surfaces of the insulation board, where at least two of the
minor surfaces each represents a surface of a resilient zone of the
board covering substantially the surface of the resilient zone
which zone goes a distance from the minor surface into the
insulation board, where said resilient zone having sufficient
elastic properties to prevent substantially any gaps to
neighbouring boards when compressed against these during
installation and in that the board has a density being sufficiently
high to apply the board for purposes such as external wall
insulation or fire insulation of steel constructions. By resilient
is basically meant that it is easily compressed by hands during
installation. The inner portion of the board away from any of the
surfaces is substantially stiff and not resilient. The density of
the board is more than 60 kg/m.sup.3, preferably at least 70
kg/m.sup.3, and even more preferably at least 80 kg/m.sup.3. The
resilient zone along at least two of the edges (i.e. the minor
surfaces) has a depth of at least 5 mm, preferably at least 8 mm
over the majority of the resilient zone measured from the outer
surface of the edge (i.e. the minor surfaces). There may also be a
transition zone when going from the resilient zone to the stiff
part of the board, where the flexibility is gradually reduced. The
resilient zone extending for a distance into the insulation board
measured perpendicularly to said minor surface of no more than 50
mm, preferably no more than 30, and even more preferably no more
than 20 mm, along the entire length, or the major length, of said
minor surface. For a number of purposes the insulation board may
comprise at least two different layers of mineral fibre having
different densities. This is also known as a dual density board.
Preferably, two minor surfaces with a resilient zone have one
corner in common, i.e. this is two minor surfaces being
perpendicular to each other.
[0023] Furthermore the invention concerns an insulating
construction comprising an inner surface against which one layer of
insulation boards is installed and fastened by fastening means and
an outer covering layer characterised in that the insulation layer
comprises one layer of the insulation boards described above. In
this construction there will be no gaps between the insulation
boards. The insulation boards for this construction may be fastened
by mechanical means. The fastening means may be placed along parts
of the edges of the insulation boards. The outer covering layer for
the construction is usually selected from the group of: metal foil,
render, wood, eternit, compressed mineral fibre boards, paint or
fleece, e.g. made from glass fibres. Other outer coverings may also
be applied. An open space where air may circulate between the
insulation layer and the outer covering layer is often applied in
order to ventilate the construction and remove moisture. The inner
surface of this construction is often the facade of a building or
the inner surface is a steel construction, e.g. a load carrying
steel construction which needs to be fire protected.
[0024] The invention also concerns a method for producing a mineral
fibre insulation board for heat, sound or fire insulation
comprising mineral fibres and a binder, said board having two major
surfaces being approximately parallel to each other, and having
four minor surfaces (edges) where at least two minor surfaces
(edges) represents a surface of a resilient zone of the board, this
resilient zone goes a distance into the board where said mineral
fibre insulation having a density of at least 60 kg/m.sup.3 and the
method comprises the following steps: 1) Mixing mineral fibres and
a binder into a web 2) Curing the binder 3) Providing at least two
of the four minor surfaces of the board with a resilient zone by a
mechanical treatment comprising that the boards passes a zone where
rollers compresses the minor surface to make the board more
resilient in that zone. Due to the high density often only one
board passes the said zone with rollers at a time, and often the
board is supported on the majority of its top and bottom surface
while passing the zone with rollers. Typically, the rollers will
extend different distances into the minor surface in order to
gradually compress the minor surface and thereby forming a more
homogenous resilient zone.
[0025] Finally, the invention concerns a method of installing
mineral fibre insulation for heat, sound or fire insulation where
the boards have at least two resilient edges and said boards have a
density of at least 60 kg/m.sup.3 and in that any gaps between the
boards are avoided by pressing the boards together so that said
resilient edges are compressed by hand and therefore closes any
gaps between two boards and in that only one layer of insulation
boards are installed on the surface.
[0026] In a first embodiment of the invention the mineral fibre
insulation board is made for being applied for heat insulation of
building facades. The density of the board is approximately 60
kg/m.sup.3, preferably more than 60 kg/m.sup.3, and even more
preferably more than 70 kg/m.sup.3. The board has a length of
400-1000 mm, preferably 500-700 mm and even more preferably
approximately 600 mm. The board has a height of 600-2000 mm,
preferably 800-1500 mm and even more preferably 1000-1200 mm. The
board has a thickness of 100-400 mm, preferably 150-300 mm and even
more preferably approximately 200 mm. The board has two edges which
are made resilient into a depth of 5-15 mm, preferably 8-13 mm and
even more preferably 10-12 mm. These two resilient edges have one
corner in common.
[0027] In a further embodiment of the invention a dual density
mineral fibre insulation board is used. This board will have an
average density and all dimensions as described in the previous
embodiment. But this board will have a top layer where the density
is higher than in the lower layer of the board. The top layer would
typically have a thickness of 8-20 mm, preferably 10-15 mm. The
density of the top layer will be a factor of 1.5-3, preferably a
factor of 2 higher than the density of the lower layer.
[0028] In a further embodiment of the invention the mineral fibre
insulation board is made for being applied for fire insulation of
metal constructions, e.g. steel or aluminium constructions, such as
the load-bearing steel constructions in buildings or ship bulkheads
and decks on ships e.g. on the lower side of decks, including the
girders.
[0029] With the existing products without resilient edges it is
necessary to cut the bats into the exact size in order to avoid
small gaps between the bats. This will take longer time and, in the
case of a fire differences in the thermal expansions of the
materials may form small gaps between the bats. Also sintering of
the mineral fibre insulation material may cause small gaps. Such
gaps will reduce the time it takes the heat and eventually the fire
on a ship to spread from one deck to another or in a building the
time it takes the load bearing steel construction to reach a
temperature where it looses its mechanical strength.
[0030] A fire insulation board according to the invention will have
at least two resilient edges giving an elastically compressible
zone along a region of the edge, which due to its elasticity will
regain its original shape after compression. The compression of
this zone means that the risk of gaps occurring during a fire is
considerably reduced.
[0031] When applying the idea of one or more resilient edges for
fire insulation on metal constructions, the mineral wool would
typically have a higher density compared to heat insulation in a
building. The density of the mineral wool board according to this
embodiment would typically be in the range of more than 60 to 150
kg/m.sup.3, preferably in the range of 70 to 140 kg/m.sup.3, and
even more preferably in the range of 80 to 130 kg/m.sup.3. This
range is often used for fire protection on ships. For fire
protection on off-shore installations densities up to 165
kg/m.sup.3 are used. The product Conlit.RTM. is a stone wool based
product developed for optimal fire protection characteristics. This
product has densities in the range 150-190 kg/m.sup.3. The
thickness of fire insulation may be down to the range 20-75 mm.
[0032] A preferred embodiment for manufacturing the mineral fibre
insulation board according to the invention is to let a stack of
4-8 boards pass a first zone with 2-4 rollers on one side of the
conveyor and a smooth conveyor surface on the opposite side of the
rollers for holding the stack of boards in position. This is
necessary due to the high density of the boards. The distance
between the rollers and the opposite smooth surface must be
adjusted so that the rollers will compress the edges of the boards
the necessary distance, e.g. 20 mm giving a resilient depth of the
surface of approximately 10-12 mm. As the two resilient edges on
the inventive insulation board preferably should have a common
corner to facilitate easy installation, the stack of boards is
turned 90 degrees after the first compression. Then the stack will
pass a second zone with 2-4 rollers on one side of the conveyor and
a smooth conveyor surface on the opposite side of the rollers. A
third and a fourth zone could also be applied if more than two
resilient edges on the boards are needed. Instead of the 2-4
different zones, the stack of boards could pass the same zone more
than one time after being rotated. This would reduce the necessary
equipment on the factory line.
[0033] Another preferred embodiment for manufacturing the mineral
fibre insulation board according to the invention is to let one
board pass a first zone with 2-4 rollers on one side of the
conveyor and a smooth conveyor surface on the opposite side of the
rollers. Then the board is turned 90 degrees and following this the
board will pass a second zone with 2-4 rollers on one side of the
conveyor and a smooth conveyor surface on the opposite side of the
rollers. While passing the first zone and the second zone the board
is being supported on its top major surface. This support could be
in the form of a conveyor band covering the majority of the top
surface preventing the board from bending due to the compression
force. Also in this embodiment the more than two zones may be
needed, and the board could pass the same zone more than one
time.
[0034] Another way to provide the insulation board with resilient
zones along edges is to cut a pattern with knifes or saws in the
edge, or to enter a number of needles or nails a certain distance
into the edge. The resiliency will be determined by how close and
how deep the cuts are made or how close and how deep the needles
are entered.
[0035] A further method for improving the resiliency of the
insulation board is to produce this according to the folding method
described in EP 741 827 B1. The folding technique is illustrated in
FIGS. 1 and 3 of EP 741 827 B1 and described in claim 1 step f).
This folding will arrange the fibres predominantly perpendicular to
the major surfaces of the fibre web being produced. The folding
will therefore also increase the resiliency of the web in the
production conveyor direction. When this web is cut into insulating
boards, these boards will be more resilient in one direction when
pressing on two opposite edges than in the direction perpendicular
to this when pressing on the two other edges. Thereby the demands
for the resiliency of the edges are reduced.
[0036] In the following the invention is described further with
reference to the figures.
[0037] FIG. 1 An insulation board with two resilient edges
marked.
[0038] FIG. 2 Four boards without resilient edges mounted on a
facade
[0039] FIG. 3 Four boards without resilient edges mounted on a
non-planar facade
[0040] FIG. 4 Four boards with resilient edges mounted on a
facade
[0041] FIG. 5 A stack of boards passing a compression station seen
from top.
[0042] FIG. 6 A stack of boards passing a compression station seen
from the side.
[0043] The mineral fibre insulation board 1 in FIG. 1 has two
resilient edges 2 meeting in the upper left corner 3. This makes it
possible to install the insulation in an easy way so that all
connections between boards can be made involving at least one
resilient edge.
[0044] FIG. 2 illustrates the result of installing boards 1 without
resilient edges. Due to the inaccuracy of cutting out the boards
different gaps between the installed boards will occur. If the edge
are not strictly perpendicular to the major surfaces, a V-shaped
gap 4 may be the result. The open side of the V may be on both
sides of the insulation 4, 5. If the board shape deviates from a
rectangular box shape several open gaps may occur between the
boards 6.
[0045] FIG. 3 illustrates the result of installing boards 1 without
resilient edges when the wall surface is non planar. V-shaped gaps
7 will be the result even if the shape of the boards is
perfect.
[0046] FIG. 4 illustrates equivalent situations as in FIGS. 2 and
3, but with use of the new board with resilient edges. In this case
there are no gaps between the boards.
[0047] FIG. 5 shows the compression station from above and FIG. 6
shows it from a side view. The stack of boards 22, which also could
be one single board 1, is moved on the conveyor (not shown) along
the factory line. The rollers 20 will compress one edge slightly in
a local zone. The opposite conveyor 21 formed by a moving band 23
and at least two rollers 24, keeps the stack of boards 22 in the
right position. The first roller 20 which is being passed will
often extend a shorter distance into the stack of boards 22 than
the following rollers 20' and 20''. It is important that the whole
minor surface is compressed in this process.
[0048] In an example of the invention the mineral fibre insulation
board is made for being applied for heat insulation of building
facades. The density of the board is approximately 60 kg/m.sup.3,
preferably more than 60 kg/m.sup.3, it has a length of 600 mm a
height of 1000 mm and a thickness of 200 mm. The board has two
edges which are made resilient into a depth 10-12 mm. These two
resilient edges have one corner in common.
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