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Патент USA US3027336

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March 27, 1962
3,027,326
R. s. MOFFETT
INSULATIONMATERIAL
Filed May 2o, 1959
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United States Patent O
3,327,326
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ICC
Patented Mai'. 27, 1952
2
1
der 11 is applied to a dry mixer 12.
Chemicals from a
3,027,326
KNSULATÍON MATERIAL
source of tire-resistant chemicals 13, rodent and roach
repellent from a source of rodent and roach repellent 14,
Robert S. Moffett, Woodland Hills, Calif., assignor toV
Insul-Seal Products, Inc., Pasadena, Calif., a corpora
and dye from a dye source 15 are also applied to the dry
mixer 12.
tion of California
Boric acid, H3BO3, and ammonium sulfate, (NH4)2SO4,
Filed May 20, 1959, Ser. No. 814,529
3 Claims. (Cl. 252-62)
are combined with the wood fiber ñuif to give initial fire
This invention relates to an improved insulation mate
rial of the shredded wood iiber type.
Insulation materials consisting of asbestos or glass fibers
arewell known. Such insulating materials have a gen
erally satisfactory resistance to burning and a compara
tively low heat transfer coefiicient. However, such insu
resistant properties to the ñuff. Such fire-resistant prop
erties are evidenced by a greenish glow which surrounds
10 portions of the ñuff as the ñuff slowly chars in response
to the application of a direct llame.
The fire-retardant
quality of the flniT so treated is considerably superior to
this property in conventional asbestos or glass über in
sulating materials.
lating materials do melt or char to an extent suñicient to
transfer a flame through the material. Furthermore, a
The treatment of the wood fiber ñutf formed from used
newsprint with boric acid and ammonium sulfate does not
signiñcant amount of heat is transmitted through such in
remove ink and-other impurities from the fluff which ex
isted in the newsprint. These impurities have been found
sulating materials,
to be attractive to rodents and roaches of various types.
According to the present invention, an improved re
sistance to charring and a lower coeiiicient of heat trans 20 It has been found that the addition of potassium alum,
A12(SO4) 3K2SO4~24H2O, to the ñuff renders the end prod
fer in an insulation material is exhibited by the end prod
uct unattractive to such rodents and roaches.
uct of a process consisting of treating shredded wood
The use of used newsprint, even when treated to the
fiber material with ammonium sulfate, boric acid, potas
extent previously described, results in a gray material
sium alum, a dye from the family of dyes consisting of
the diamino derivatives of triphenyl methane, and water. 25 which lacks any attractiveness in its color. A dye is there
fore added to the material in order to give the end prod
In addition, a liquid aromatic agent is utilized to give the
uct insulating material a satisfactory color appearance
end product insulating material an acceptable aroma.
for commercial use. A dye from the family of dyes con
These constituents are then chemically combined. After
chemical processing, the insulation material is dried by
being fluidized Aby air and is >then packed into appropriate
sisting of diamino derivatives of triphenyl methane also
30 adds fire-retardant qualities to the insulating material. An
example of such a dye is Brilliant Green, diethylamino
triphenyl methane, whose chemical representation is
containers.
A moisture absorption test of the material shows the
following typical characteristics:
35
Percent
Loss in
Time of Exposure, Hours
Weight,
Percent
Gain in
Weight,
50 o
75%
Relative
Relative
Percent
Gain in
Weight,
u
Relative
Humidity Humidity Humidity
l. 15
1. 55
1. 78
1. 81
2. 49
3. 37
5. 90
10. 8U
32. 5
The resulting dry mix out-put is fed to a wet mixer 16.
Water from a water source 17 and liquid aromatic from
a source of liquid aromatics 18 are also applied to the
wet mixer 16.
An example of such a liquid aromatic is “Alamask
The tire-resistant quality of the insulation material is 45 CPM,” which has the following composition:
illustrated by the following test. After being maintained
Percent
at a constant temperature of 135° Fahrenheit for thirty
nine days, the insulation material is subjected directly to
a dame from a Bunsen burner for a period of fifteen min
utes. After removal of the llame, smoldering of the in
sulation material is visible for no longer than two and
one-half minutes. The maximum penetration of oharring
Organic aldehydes __________________________ __ 3.5
Acetates as Iso Dorynl ______________________ __ 9.9
Organic
ketones ____________________________ __ 5.7
50
Essential oil terpenes ________________________ __ 60.3
Organic esters as phthalate ___________________ __ 20.6
Alamask CPM has the additional properties when com
into the insulation material is ñve inches.
bined with the other constituents in the proportions given
The dielectric strength of the insulation material is illus
trated by the fact that no appreciable difference exists be 55 herein of adding to the tire-resistance of the material and
of adding to the roach repellency of the material, there
tween the dielectric strength of air and the dielectric
by increasing the over-all eñ‘iciacy of insulating material.
strength of the end product insulation material at relative
Chemical reactions between the various constituents
humidities less than 50%. At relative humidities in the
occur in the wet mixer 18. The output of the wet mixer
range of 75 to 100%, lthe dielectric strength of the insula
tion material is approximately two-thirds that of free air. 60 consists of a damp insulating material. This damp in
sulating material is simultaneously dried and transported
The drawing is a block diagram illustrating the process
by which the insulating material is produced.
Referring to the drawing, wood liber from a source of
wood über 10 is fed to a wood fiber shredder 11. The
primary constituent of the insulating material according
to the invention is shredded wood über. Used newsprint
furnishes a satisfactory source of such wood fiber. The
newsprint is finely shredded so as to have a flour or ñuiï
like consistency by the shredder 11.
The huit-like shredded wood liber output of the shred
to a packer 20 by means of a solids ñuidizer 21.
The
solids iluidizer 21 preferably utilizes air as the iluidizing
agent. The dried insulating material is packed into con
tainers 22 by the packer 20.
Although some variation in the proportions of the
various constituents may be made without having a de
cisively adverse effect upon the performance of the in
sulating material, the preferred embodiment of the in
sulating material is produced by a process utilizing the
3,027,326
n,
d
previously named constituents in the following propor
tions by weight:
the family of dyes consisting of diamino derivatives of
triphenyl methane, and water in substantially the follow
ing weight ratios to each other:
Parts
Parts
Shredded wood fiber as used newsprint ________ __ 68
Ammonium
sulfate _________________________ __
4
Shredded Wood fiber ________________________ __ 68
Boric acid (powdered 991/2% pure) ___________ __
6.5
Ammonium
Potassium alum ____________________________ __
4
Boric acid _________________________________ __
6.5
Brilliant Green dye _________________________ __
4
Potassium
4
Alamask CPM_ ____________________________ __
2
Water (liquid form) ________________________ __
8
sulfate _________________ ___ ______ __
alum ______________ __ ____________ __
4
Dye from the fami-1y of dyes consisting of diamino
derivatives of t-riphenyl methane ____________ __
4
thereby giving a total of 96.5 parts. The remaining 3.5
parts required to constitute 100 parts of the finished
product consist of water taken in during processing in
Water ____________________________________ __
8
the form of vapor from the air.
sisting of the steps of mixing together sixty-eight parts by
and subsequently iluidizing the resultant material.
V3. The method of producing insulating material con
'
It has been found that the tire-resistant quality of the
insulating material is improved by the addition of the
dye and the aromatic agent over this quality in similar
weight of shredded wood ñber in the form of used news
print, four parts by weight of ammonium sulphate, six
and onedhalf parts by weight of boric acid, four parts by
weight of potassium alum, and four parts by weight of
Brilliant Green dye, in substantially the given propor
insulating material not so treated. Thus, there is a chemi
cal co~action between the above ingredients which irn
proves the nre-resistant quality, although the actual chem
tions, ina dry mixer so as to produce a dry mix, trans
ferring the dry mix to a wet mixer, wetting the dry mix
in the wet mix by the addition of substantially ten parts
ical mechanism causing this improvement is not corn
pletely understood by me at this time.
l claim:
'
by weight water, and ñuidizing the resulting wet mix by
1. The insulation material formed by the mixing of
constituents consisting essentially of shredded wood über,
ammonium sulfate, boric acid, and potassium alum in
substantially the following weight ratios to each other:
air so as to produce a dry product.
References Cited in the ñle of this patent
UNITED STATES PATENTS
Parts
Shredded wood fiber ________________________ __ 68
Ammonium
sulfate _________________________ __
4
Boric acid _________________________________ __
6.5
Potassium
alum ______________ __ ____________ __
4
Water ____________________________________ __
8
and subsequently iluidizing the resultant material.
2. The insulating material formed by mixing constitu
ents consisting essentially of shredded wood fiber, arn
monium sulfate, boric acid, potassium alum, a dye from
30
12,594
329,973
1,911,279
2,110,470
2,120,431
2,147,793
2,470,641
Holmes _____________ __ Mar. 27,
Tanczos ________ _______ Nov. 10,
Hochstetter __________ __ May 30,
Norton __ _____________ __ Mar. 8,
Stafford _____________ __ June 14,
Kropp ______________ __ Feb. 21,
Portz _______________ __ May 17,
1855
1885
1933
1938
1938
1939
1949
OTHER REFERENCES
“The Condensed Chemical Dictionary,” 5th ed., pp.
31 and 1121 (1956), Reinhold Pub. Corp., N_Y.
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