U.S. patent application number 10/575009 was filed with the patent office on 2007-08-09 for insulating material element made of mineral fiber felt for clamping-like assembly between beams and the like.
This patent application is currently assigned to Saint-Gobain Isover. Invention is credited to Jean-Luc Bernard, Horst Keller, Michael Schumm.
Application Number | 20070184740 10/575009 |
Document ID | / |
Family ID | 34436700 |
Filed Date | 2007-08-09 |
United States Patent
Application |
20070184740 |
Kind Code |
A1 |
Keller; Horst ; et
al. |
August 9, 2007 |
Insulating material element made of mineral fiber felt for
clamping-like assembly between beams and the like
Abstract
At an insulation material sheet, consisting of a mineral fiber
felt bound with a binding agent, of biosoluble mineral fibers,
rolled up in the form of a roll, the composition of the mineral
fibers features an alkali/earth alkali relation of <1 and the
fiber structure is determined by the following features, i.e.
average fiber diameter <4 .mu.m, gross density in the range of 8
to 25 kg/m3 and binding agent portion in the range of 4 to 5,5
weight %.
Inventors: |
Keller; Horst;
(Wilhelmsfeld, DE) ; Schumm; Michael;
(Schriesheim, DE) ; Bernard; Jean-Luc; (Giencourt
Breuil Le Vert, FR) |
Correspondence
Address: |
SHERIDAN ROSS PC
1560 BROADWAY
SUITE 1200
DENVER
CO
80202
US
|
Assignee: |
Saint-Gobain Isover
Les Miroirs, 18, Avenue d' Alsace
Courbevoie
FR
F-92400
|
Family ID: |
34436700 |
Appl. No.: |
10/575009 |
Filed: |
October 4, 2004 |
PCT Filed: |
October 4, 2004 |
PCT NO: |
PCT/EP04/11063 |
371 Date: |
December 12, 2006 |
Current U.S.
Class: |
442/320 ;
442/355 |
Current CPC
Class: |
Y10T 442/631 20150401;
C03C 13/00 20130101; E04B 2001/742 20130101; C03C 13/06 20130101;
E04B 1/7662 20130101; Y10T 442/50 20150401; C03C 2213/02 20130101;
E04B 2001/741 20130101 |
Class at
Publication: |
442/320 ;
442/355 |
International
Class: |
D04H 1/08 20060101
D04H001/08; D04H 13/00 20060101 D04H013/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 6, 2003 |
EP |
03022612.0 |
Jan 7, 2004 |
FR |
0400084 |
Claims
1. Insulation material element of mineral fibers, bound with a
binding agent, soluble in a physiological milieu, in form of an
insulation material plate or to a insulation material sheet rolled
up as a roll and separable into insulation material plates as a
portion of a system, prepared for clamped assembly of insulation
plates between beams, such as roof rafters, characterized in that
the composition of the mineral fibers of the insulation material
element features a alkali/earth alkali relation of <1 and that
their fiber structure is determined by an average geometric fiber
diameter of <4 .mu.m, by a gross density in the range of 8 to 25
kg/m3 and a portion of the binding agent referred to the fiber mass
of the insulation material element in the range of 4% to 5.5 weight
%.
2. Insulation material element according to claim 1, characterized
in that said binding agent is an organic binding agent.
3. Insulation material element according to claim 1, characterized
in that the binding agent, referred to the fiber mass of the
insulation material sheet, is in the range of 4.5 to 5 weight
%.
4. Insulation material element according to claim 1, characterized
in that its gross density is in the range of 8 to 14 kg/m,
preferably 11 to 14 kg/m3, especially approximately 13 kg/m3, and
the insulation material element features a thermal conducting
capacity corresponding to thermal conductivity group 040, according
to DIN 18165 or similar.
5. Insulation material element according to claim 1, characterized
in that their gross density is in the range of 18 to 25 kg/m3,
preferably 19 to 24 kg/m3, especially 23 kg/m3, and the insulation
material element features a thermal conducting capacity
corresponding to the thermal conductivity group 035, according to
DIN 18165.
6. Insulation material element assembled between beams, such as
roof rafters, without additional internal lining, according to
claim 1, characterized in that it features a fire resistance
category of at least EI 30, according to EN 113501.
7. Insulation material element according to claim 1, characterized
in that the roll up process of the mineral fiber felt, rolled up in
form of a roll, is accomplished free of a prior treatment,
eventually free of a fulling process.
8. Insulation material element according to claim 7, characterized
in that the wound up roll of the mineral fiber felt is compressed
pursuant to a compression ratio of 1:3 until 1:8, preferably 1:4
until 1:6.
9. Insulation material element according to claim 1, characterized
in that upon said section, markings are provided as cutting aids,
featured at least on one roll surface.
10. Insulation material element according to claim 1, characterized
in that the mineral fibers of the insulation material element, as
far as their solubility in a physiological milieu is concerned,
correspond to the requirement of European Guideline 97/69/EG and/or
the requirements of the German Dangerous Products Norm, Section IV,
Nr.22.
11. Insulation material element according to claim 1, characterized
in that said mineral fibers of the insulation element are produce
by internal centrifugation in the centrifuging basket process, with
a temperature at the centrifuging basket of at least 1,100.degree.
C.
12. Insulation material element according to claim 1, characterized
in that it features a fusion point according to DIN 4102, Part 17,
of <1,100.degree. C.
13. Insulation material element according to claim 1, characterized
by the following ranges of chemical composition of mineral fibers
in weight %: TABLE-US-00004 SiO.sub.2 39-55% Al.sub.2O.sub.3 16-27%
CaO 6-20% MgO 1-5% Na.sub.2O 0-15% K.sub.2O 0-15% R.sub.2O
(Na.sub.2O + K.sub.2O) 10-[[14,7]] 14.7% P.sub.2O.sub.5 0-3%
Fe.sub.2O.sub.3 (Iron total) [[1,5]] 1.5- 15% B.sub.2O.sub.3 0-2%
TiO.sub.2 0-2% Other 0-[[2,0]] 2.0%
14. Insulation material element according to claim 1, characterized
in that the fiber structure of the insulation material element is
respectively free of beads, meaning the bead portion is <1%.
15. System for clamping insulation material elements between
rafters of a building, in particular rafters of a roof,
characterized by insulation material elements with the features of
claim 1, being aligned and clamped with a clamping felt between
adjacent beams.
Description
[0001] The present invention refers to an insulation material
element, according to preamble of claim 1.
[0002] Such a "clamping felt" is known, for example, from DE 36 12
857 and is being successfully used for many years, especially for
insulation purposes between rafters in vertical roofs. For this
purpose, a glass wool felt is being used, whose fibers are being
obtained by internal centrifugation, according to the centrifuging
basket process, bound with a binding agent quantity of
approximately 6 to 7 weight % (dried, relative to the fiber mass),
which is increased with respect to conventional glass wool, and the
gross densities with nominal thickness of such insulating material
sheets produced is between 10 and 30 kg/m3. For transportation and
warehousing, the felt sheet produced is rolled up with an average
compression of 1:5 as a roll felt and, compressed in this fashion,
it is being packed in a foil. At the construction site, the foil is
cut and the roll felt, as a result of its internal tension, rolls
out in the form of a plane insulating material sheet with
plate-like character, in a certain nominal thickness. From this
rolled out insulating material sheet, normally supported by marking
lines foreseen transversally to the longitudinal direction of said
insulating material sheet, it is possible to cut off plates
corresponding to the local width of a rafter area, which are then
being mounted into said rafter area transversally towards the
production and roll up direction ("The plate from the roll"). The
cutting procedure takes place with a certain excessive measure, so
that during introduction into the rafter area, the plate segment is
laterally compressed against the rafters, which is reinforced by
the relatively high tensions then arising inside the clamping felt,
in the form of clamping forces, which, by friction at the
contiguous rafter area, avoid falling of said plate segment. From
this clamped assembly originates the expression "clamping felt".
Optionally to the insulation material sheet there are also
insulating plates made of mineral wool and being clamped between
rafters available that feature marking lines, which serve here as a
cutting aid for inserting the insulation material plates between
the rafters.
[0003] In order to insure, between the rafters, a corresponding
clamping effect of the insulating material plates cut off from the
rolled insulating material sheet, it is required that these
insulating material plates, cut off excessively, during their
assembly between the rafters, feature correspondingly high clamping
forces. For this purpose, these clamping felts are being configured
with high rigidity, which is attained due to the fact that these
glass wool felts are being produced with a relatively high binding
agent content, which is approximately between 6 and 7 weight %. Due
to this high binding agent content, on the other hand, a
correspondingly high integration of fire load is produced, which,
again, is disadvantageous from the viewpoint of technical fire
protection reasons.
[0004] Although such clamping felts are being widely used,
additional improvements are desirable. Said roll felt sheet also
has to be manufactured with a certain excessive thickness, in order
to insure that after rolling out, the sheet effectively attains the
nominal thickness, required for assembly of the clamping felt
plates. It must be observed, in this case, that opening of the roll
does not take place immediately after packing, but after a
warehousing period at the manufacturer, in the shop or consumer,
comprising weeks or months. During this period, the internal
tension of the material may progressively be lessened, as a result
of aging factors, so that the insulating material sheet for the
clamping felt, when being rolled out, does not recover its original
thickness as desired, as would occur when the roll is immediately
opened after its production. This possibly reduced resetting
feature with the passage of time is being considered by am
excessive thickness during the production phase. This excessive
thickness, which in addition to aging phenomena, also considers a
partial fragmentation of fibers during the roll up procedure, as a
consequence of the compression feature, is highly important. So, a
clamping felt with a nominal thickness of 160 mm, may require a
production in a thickness of 200 mm, in order to insure that also
months later a resetting to the nominal thickness of 160 mm takes
place surely.
[0005] On the other hand, also clamping felts of rock wool are
known (DE 199 104 167), with the rock wool being produced in the so
called nozzle blowing process or by means of other centrifuging,
eventually with the so called cascade centrifuging process. The
conventional rock wool fibers thus obtained consist of relatively
short, however thick and therefore comparably less elastic fibers
with a bead portion, i.e. a portion of not fiberized material of 10
to 30% of the fiber mass. The beads are of non-defibrated material,
therefore rougher fiber components. The gross densities of this
material are practically above 25 kg/m3, and the binding agent
content of these clamping felts of conventional rock wool, compared
to clamping felts of glass wool, with eventually 2 to 3 weight %,
is relatively low. Nevertheless, as a consequence of the high gross
density, seen from an absolute viewpoint, the integration of
binding agent is comparable to the integration which takes places
with clamping felts of glass wool. As a consequence of the
relatively reduced elasticity, such clamping felts of conventional
rock wool, in the way they have to be rolled for transportation in
the form of roll felts, before the rolling up station, are
eventually recompressed and decompressed, in order to render them
more "elastic". With such an elastification by means of application
of pressure, however, there will forcibly result a fiber rupture.
As a consequence of this event and due to the subsequent strain
exerted upon the fibers during the rolling up process, to prepare
the roll, a resetting during the roll out phase to form the
clamping felt plate, especially with high compression figures, is
unsatisfactory and is lower than with conventional glass wool
felt.
[0006] Based on the relative high gross density of conventional
glass wool felt, a compression ratio above 1:2,5 approximately is
less practicable, since in this case the mechanical properties of
the product would suffer considerably. In addition, with such a
compression relationship only a reduced economy of space may be
obtained for warehousing and transportation, as compared to glass
wool clamping felts.
[0007] To attain thermal conductivity group 035 with rock wool
material, a gross density of approximately 40 to 45 kg/m3 is
required, while with the same thermal conductivity group, with
glass wool material, a gross density of less than 20 kg/m3 is being
attained. To obtain the same thermal passage resistance, a clamping
felt plate of conventional rock wool felt is at least twice as
heavy as a plate of conventional glass wool felt, which is
negatively observed vis-a-vis the clamping condition, based on the
higher specific weight of the rock wool felt.
[0008] A characteristic feature of differentiation between glass
and rock wool as subgroups of the category of mineral wool,
consists in the alkali/earth alkali mass relation of the
composition, which in the case of rock wool is <1 and in the
case of glass wool >1. Typically, conventional rock wool has a
high portion of CaO +MgO of 20 to 30 weight % and a relatively low
portion of Na2O and K20 of approximately 5 weight %. Typically,
conventional glass wool, on its turn, features earth alkali
components of approximately 10 weight % and alkali components above
15 weight %. These figures apply especially to non-biopersistent,
i.e. biosoluble compositions.
[0009] It is an object of the present invention to create a mineral
fiber element, particularly a mineral fiber plate from the roll,
for clamped assembly between beams, such as roof rafters, which,
vis-a-vis comparable mineral fiber elements from the state of the
art, feature a lower fire load between beams, i.e. a lower absolute
binding agent content, without affecting the demands of the
prevailing fire protection and the clamping behavior, as well as
processing, especially haptic, and simultaneously--seen from an
absolute viewpoint--the excessive thickness, required during the
production of the mineral wool felt to be rolled up, should be
reduced.
[0010] According to the invention, this task is being solved by the
features, contained in the characteristic part of claim 1, and
preferred additional embodiments are marked by the characteristics
contained in the dependent claims.
[0011] The invention is distinguished by an alkali/earth alkali
mass relation of the mineral fibers of <1 and a fine fiber
structure of the insulating element, determined by the factors of
average geometric fiber diameter <4 .mu.m, gross density in the
range of 8 to 25 kg/m3 and a binding agent portion in the range of
4% to 5,5 weight %, referred to the fiber mass of the insulating
material element. Based on the chosen alkali/earth alkali mass
relation of <1, the fibers evidence a high temperature
resistance, similar to conventional rock wool fibers. The fine
fiber structure is essentially used due to the fact that fibers
with an average geometric fiber diameter of <4 .mu.m are being
used. Such a fiber structure may also be attained with glass wool,
however as compared to rock wool, it is considerably less
temperature resistant. The range of the average geometric diameter
of conventional rock wool fibers is normally above 4 to 12 .mu.m,
so that the fibers are configured in relatively coarse fashion. As
a consequence of the configuration according to the invention,
there results for a mineral fiber structure, with identical gross
density as in the case of conventional rock wool, a far larger
number of fibers in the structure and, therefore, a large number of
crossing points of said fibers. Therefore, this structure may be
adjusted to a lower gross density, and the gross density range,
according to the invention, is from 8 to 25 kg/m3 for the desired
usage of the clamping felt. Also the insulating element is
distinguished by a satisfactory insulation capacity.
[0012] Additionally, also the use of a preferentially organic
binding agent may be reduced with the product according to the
invention, as compared to glass wool, i.e. to a range of 4 weight %
up to 5,5 weight %, preferably to a range of 4,5 weight % until 5
weight %, with which the applied fire load is being reduced,
without negatively affecting the clamping behavior. Finally, as a
result of the fine fiber structure and reduced fire load the
insulation material element is sufficiently stiff. In the case of
an insulation material sheet this is at the same time windable up
to a roll without damaging the fibers. The insular mineral fiber
plate, cut off from the roll, is thereby sufficiently rigid for
clamped integration between beams, i.e. rafters. As a consequence
of the fine fiber structure, as compared to conventional rock wool,
the air portion required for the insulation effects, is raised
inside the clamping felt, which results in a corresponding increase
of the insulating effect. Both the insulation material sheet and
the insulation material plate are homogenously formed in the range
applicable for the clamping effect, meaning that they feature the
same density relations via the cross section.
[0013] Compared to conventional rock wool, from the higher,
relative binding agent content, a more rigid configuration of the
clamping felt results, but as a result of the considerably higher
gross density of the conventional rock wool, the applied absolute
fire load is being essentially reduced. In an analog fashion, also
the fire load is reduced, as compared to conventional clamped felts
made of glass wool.
[0014] As already initially outlined, the fibers according to the
invention distinguish themselves as a result of the alkali/earth
alkali mass relation of <1 by the high temperature resistance
and correspond, therefore, to the properties of conventional rock
wool. Based on the finer fiber structure, however, and on the
comparably lower gross density, there results for the structure
according to the invention, a far more elastic behavior. Compared
to conventional rock wool, the insulation material sheet, before
the roll up step, does not require special treatment, eventually a
fulling or flexing process, so that the compression and
decompression steps, required with conventional rock wool, are no
longer needed. Conveniently, the mineral wool felt, during the roll
up phase, is being compressed to a roll with a compression ratio of
1:3 to 1:8, preferably from 1:4 to 1:6.
[0015] In a similar fashion, the clamping felt of the invention
distinguishes itself by an outstanding resetting behavior, so that
the required insulation material element advantageously may be
produced with a comparably lower excessive thickness, than this
takes place with conventional products. This resetting behavior
remains preserved also after longer warehousing periods of the
rolled up roll felt, so that the insulation material sheet, when
being used, again is being reset advantageously to its nominal
thickness, which is important also vis-a-vis the technical
insulation features. The term insulation material sheet has to be
broadly seen and it comprises a never-ending sheet, as it is coming
out of the hardening oven for further mechanical processing,
meaning edge-trimming, cut-outs, etc. therefore also to a roll
convertible, meaning rolled insulation material sheets, which can
be separated on the site at the right distance to the plates.
[0016] The reduction as a result of the required excessive
thickness, based on the improved resetting behavior, has
advantageous effects at an existing, unaltered production site,
since with this feature it is also possible to produce nominal
thickness which so far could not be produced without additional
investment costs, since the maximum global thickness of the
produced felt is composed of nominal thickness and excessive
thickness.
[0017] In addition, as a consequence of the reduction of the
required excessive thickness, the operational safety of the
production may be advantageously increased. The limiting parameter
is a minimum gross density, technically predetermined by the
hardening oven, being defined from the initiating configuration of
heterogeneous phenomena in the fleece by the passage flux of hot
air during the hardening process. As a consequence of the lower
excessive thickness required, with identical fiber mass applied,
this is present in a small volume, resulting in higher gross
density in the hardening oven, i.e. the reduction of the excessive
thickness increase, the so called "safety distance". With the
utilization of the "safety distance", thus obtained, this renders
it possible to additionally minimize the product gross density,
which again results in a lighter product, which may be processed
with less fatigue (keyword: shorter assembly times).
[0018] Additionally, as compared to conventional rock wool, during
the assembly, other advantages become apparent for the product
according to the invention. During the assembly between roof
rafters, an improved resetting takes place in "lateral direction",
due to the fact that most of the fibers are aligned parallel to the
large surfaces of the product and, in addition, in this direction,
which during the roll up process is radially placed towards the
roll up nucleus, practically no fibers are being damaged during the
roll up process. The clamping felt is thus quite considerably more
rigid in the lateral direction than eventually in its "thick"
direction. It has been evidenced that this lateral clamping force
during the assembly, in the case of the product according to the
invention, does not notably decline with the passage of time, which
evidently may be attributed to the improved elasticity properties
of the product according to the invention, also exposed to aging
influences.
[0019] For embodiments according to practical usage, work is being
accomplished with a gross density in the range of 8 to 14 kg/m3,
preferably 11 to 14 kg/m3, especially approximately 13 kg/m3, and
with such gross densities, thermal conducting capacity results,
corresponding to the thermal conductivity group 040 according to
DIN 18165 or similar, are being attained. By adjusting to a thermal
conducting capacity corresponding to thermal conductivity group
035, according to DIN 18165 or similar, a gross density of 18 to 25
kg/m3, preferably from 19 to 24 kg/m3, especially approximately 23
kg/m3, will be required. For clarification it has to be adhered
that references to DIN-norms and examination requirements
respectively refer to the current version to the filing date.
[0020] With the clamping felt of the invention it is also possible
to attain fire protection constructions of at least a fire
resistance category EI 30 according to EN 131501, where the
clamping felt is integrated between beams, such as roof rafters,
without additional interior lining.
[0021] The mineral fibers for the insulation material of the
invention may especially be produced by internal centrifugation
according to the centrifuging basket procedure, with a temperature
at the centrifuging basket of at least 1.100.degree. C., with the
obtention of fibers with a fine fiber diameter in the indicated
range. Mineral wool fibers, produced with the internal
centrifugation according to the centrifuging basket process, are
known from EP 0 551 476, EP 0 583 792, WO 94/04468, as well as from
U.S. Pat. No. 6,284,684, to which reference is expressly being made
with a view to additional details.
[0022] The reduced average geometric diameter, responsible for the
fiber fineness, is being determined by the frequency distribution
of the fiber diameter. The frequency distribution can be determined
with the microscope, based on a wool sample. The diameter of a
large number of fibers is being measured and applied, resulting in
an oblique distribution towards the left side (see FIGS. 2, 3 and
4).
[0023] With a view to the temperature resistance, it is convenient,
in the case, that the insulating element feature a fusion point
according to DIN 4102, Part 17, of >1.000.degree. C.
[0024] Advantageously, the clamping felts are formed of mineral
fibers, soluble in physiological milieu, corresponding to the
requirements of the European Guideline 97/69/EG and/or the
requirements of the German Dangerous Products Norm, Section IV, Nr.
22, insuring absence of dangers to the health of the clamped felts
during their production, processing, utilization and
elimination.
[0025] Subsequently, in Table 1, the preferred composition of the
mineral fibers of a clamping felt according to the invention is
shown, per range, in weight %: TABLE-US-00001 TABLE 1 SiO.sub.2
39-55% preferably 39-52% Al.sub.2O.sub.3 16-27% preferably 16-26%
CaO 6-20% preferably 8-18% MgO 1-5% preferably 1-4.9% Na.sub.2O
0-15% preferably 2-12% K.sub.2O 0-15% preferably 2-12% R.sub.2O
(Na.sub.2O + K.sub.2O) 10-14.7% preferably 10-13.5% P.sub.2O.sub.5
0-3% preferably 0-2% Fe.sub.2O.sub.3 (iron total) 1.5-15%
preferably 3.2-8% B.sub.2O.sub.3 0-2% preferably 0-1% TiO.sub.2
0-2% preferably 0.4-1% Other 0-2.0%
[0026] A preferred smaller range of SiO.sub.2 is 39-44%,
particularly 40-43%. A preferred smaller range for CaO is 9,5-20%,
particularly 10-18%.
[0027] The composition according to the invention relies on the
combination of a high Al.sub.2O.sub.3-content, of between 16 and
27%, preferably greater than 17% and/or preferably less than 25%,
for a sum of the network-forming elements--SiO.sub.2 and
Al.sub.2O.sub.3--of between 57 and 75%, preferably greater than 60%
and/or preferably less than 72%, with a quantity of alkali metal
(sodium and potassium) oxides (R.sub.2O) that is relatively high
but limited to between 10-14,7%, preferably 10 and 13,5%, with
magnesia in an amount of at least 1%.
[0028] These compositions exhibit remarkably improved behaviour at
very high temperature.
[0029] Preferably, Al.sub.2O.sub.3 is present in an amount of
17-25%, particularly 20-25%, in particular 21-24,5% and especially
around 22-23 or 24% by weight. Advantageously, good refractoriness
may be obtained by adjusting the magnesia-content, especially to at
least 1,5%, in particular 2% and preferably 2-5% and particularly
preferably >2,5% or 3%. A high magnesia-content has a positive
effect which opposes the lowering of viscosity and therefore
prevents the material from sintering.
[0030] In case Al.sub.2O.sub.3 is present in an amount of at least
22% by weight, the amount of magnesia is preferably at least 1%,
advantageously around 1-4%, preferably 1-2% and in particular
1,2-1,6%. The content of Al.sub.2O.sub.3 is preferably limited to
25% in order to preserve a sufficiently low liquidus temperature.
When the content of Al.sub.2O.sub.3 is present in a lower amount of
for example around 17-22%, the amount of magnesia is preferably at
least 2%, especially around 2-5%.
[0031] The present invention combines, thus, the advantages of
glass wool, relative to insulating capacity and compression, with
those of rock wool, relative to temperature resistance and
distinguishes itself also by an exceptional and predominant fire
protection. Compared to rock wool, also an essential economy of
weight is important, which has indirect effects vis-a-vis the
clamping insertion technique, since the clamping felts of the
invention are practically exempt of beads not participating of the
insulation effect, meaning that the bead proportion is <1%. Due
to this the specific load to be retained with the clamping effect
of the clamping felt is lower. Additionally, there is an
improvement in the product haptic, based on the finer fiber
structure and the absence of beads, and in the case of beads, these
are unfiberized components, which, in addition to the coarser
fibers, are significantly responsible for the haptic of
conventional rock wool and are liable to contribute towards a
higher dust producing behavior. Finally, based on the elastic
behavior of the insulating material sheet of the invention, it is
possible to undertake production with comparably lower excessive
thickness.
[0032] Subsequently, the invention will be described and explained
in detail, based on the drawing. The figures show:
[0033] FIG. 1 perspective view of a roll of mineral fibers with
rolled out terminal segment,
[0034] FIG. 2 a typical fiber histogram of a conventional rock
wool,
[0035] FIG. 3 a typical fiber histogram of a conventional glass
wool, and
[0036] FIG. 4 a typical fiber histogram of the mineral wool
according to the invention.
[0037] The insulation material sheet 1, shown in FIG. 1, consisting
of mineral fibers, is partially rolled out, and the rolled out
front terminal segment is designated with number 2. In the example
shown, the insulation material sheet features a gross density of 13
kg/m3. The average geometric fiber diameter is of 3,2 .mu.m and the
binding agent portion is around 4,5 weight % referred to the fiber
mass of the insulating material sheet. The insulation material
sheet shown is not laminated and is formed of mineral fibers, where
the alkali/earth alkali relation is <1. Alternately, also a
laminated version is possible according to EP 1223 031, to which
reference is now expressly being made.
[0038] As can be gathered from the front terminal segment 2,
partially extracted from hub 3 of roll, the surface of the
insulating material sheet, located inside hub, is provided with
modular marking lines 5, aligned transversally to the longitudinal
direction of the insulating material sheet and being disposed in
uniform reciprocal distance d at the surface of said insulation
material sheet. These marking lines, which may be disposed in
different forms on the insulating material sheet, are formed by
optically active lines, which are differently colored in relation
to the insulation material sheet, being produced especially by
heated marking cylinders. These marking lines 5 serve as cutting
aids, so that simply the insulation material sheet may be cut at a
predetermined length L of the terminal segment, and the cut is
being made vertically towards the lateral borders 6 and parallel to
the front border 7 of the insulation material sheet 1, as indicated
by a knife 8 in FIG. 1. The knife is being conducted in the arrow
direction 9 through the material, so that a terminal section with
excessive measurement U is being produced, above 2 cm, for example,
which is adequate as mineral fiber plate for clamping assembly
between rafters. Alternately, the marking can also be made in the
form of pictograms and similar procedures, as long as these may act
as cutting aids.
[0039] In the example shown, the insulation material sheet 1 is
rolled up with a compression rate of 1:4,5 to the roll. With the
gross density of 13 kg/m3, the thermal conducting capacity of the
insulating material section corresponds to thermal conductivity
group 040.
[0040] The composition in weight % of the conventional, i.e.
insulation material sheet formed from conventional rock wool, as
well as insulation material sheet formed of conventional glass wool
and the insulation material sheet according to the invention,
results from Table 2, and the conventional rock wool as well as the
insulation material sheet according to the invention, feature a
fusion point of at least 1000.degree. C. according to DIN 4102,
Part 17. TABLE-US-00002 TABLE 2 insulating material conventional
conventional section according to Material rock wool glass wool
invention SiO.sub.2 57.2 65 41.2 Al.sub.2O.sub.3 1.7 1.7 23.7
Fe.sub.2O.sub.3 4.1 0.4 5.6 TiO.sub.2 0.3 0.7 CaO 22.8 7.8 14.4 MgO
8.5 2.6 1.5 Na.sub.2O 4.6 16.4 5.4 K.sub.2O 0.8 0.6 5.2
B.sub.2O.sub.3 5 P.sub.2O.sub.5 0.15 0.75 MnO 0.3 0.6 SrO 0.5 BaO
0.34 Total 100 99.95 99.89
[0041] The composition is highlighted also by the fact that the
fibers are biosoluble, i.e. they may be neutralized in a
physiological milieu. The insulation material sheet with this
composition is highlighted by intense resetting forces and
corresponding rigidity. With comparable excessive measures as in
the state of the art, sufficiently high resetting forces are
attained at the assembly between rafters under compression, which
insure a safe and firm retention of the insulation material plate
also after longer periods of utilization.
[0042] Finally, FIGS. 2 and 3 features for the conventional rock
wool and glass wool, mentioned in the description, a typical fiber
histogram of an insulation material sheet, and FIG. 4 indicates
such a histogram of fibers of an insulation material sheet
according to the invention.
[0043] From the following table 3 result preferred embodiments of
the fibers according to invention (so-called IM wool) in comparison
to conventional glass and rock wool fibers in regard of the
achieved clamping effect. Hereby GV stands for the loss due burning
(and therefore the adhesive agent portion) and WLG stand for the
thermal conductivity group according to DIN 18165. Measurement was
hereby made by an internal examination norm for determining the
clamping capability. Hereby embodiments with nominal densities from
140 to 160 mm were compared. The device used for measurement
comprises a fixed and adjustable rafter portion, which can be
adjusted in distances of 700 mm, starting from 100 mm, to 1300 mm.
The test samples are respectively examined with an overmeasure of
10 mm to the clamping felt. The measurement device was set to a
clamping width of 1200 mm and the test sample was clamped between
the rafters at a width of 1210 mm. If the felt does not clamp, the
next smaller width is used at the measurement device and the test
sample is cut to 1110 mm. The examination was continued until the
test sample was clamped into the device resulting to the indicated
figures for the clamping effect shown in table 3. TABLE-US-00003
TABLE 3 bulk density nominal clamping [kg/m.sup.3] density GV[%]
WLG effect glass wool 13 140 4 040 800 rock wool 31 140 3 040 800
IM 14 140 4 040 1200 glass wool 21 160 4 035 700 rock wool 46 160 3
035 800 IM 23 160 4 035 1200
* * * * *