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Патент USA US2112799

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2,112,799
‘Patented Mar. 29, 1938
UNITED STATES PATENT OFFICE
2,112,799
'
‘
TREATING FILTER FIBERS
Robert C. Williams, Columbus, Ohio, assignor to
The Ironsides Company, Columbus, Ohio, a
corporation of Ohio.
No Drawing. Application July ‘I, 1936, :
Serial No. 89,482
2 Claims. 101. 183-45)
This invention relates to an improved com
position, composed primarily of petroleum hydro
carbons and deliquescent salts, especially adapt
ed for the purpose of treating hemp and other
5 cellulosic or vegetable ?bers in order to render
the latter, when in the form of a loose assemblage,
more e?icient when employed in air ?ltration
capacities.
‘
Hemp ?bers are being used to a limited extent
‘,0 as air ?lters in conditioning apparatus for re
moving dust or solid particles from air or other
gaseous ?uids and also for thermal insulation
purposes. The same, however, are of vegetable
origin and do not possess the in?ammable prop
15 erties of rock, glass or other siliceous wools. I
have found that such hemp ?bers, however, when
sprayed with a substantial percentage of a com
bination of petroleum hydrocarbons, calcium
chloride, bentonite and water preseng coated sur
20 faces of the above combination of materials in a
tion of the above formula, adapted for use in air
conditioning equipment in which the air passing
through the ?lter is not refrigerated and con
sistently has a high relative humidity, it is pos
sible that a lower percentage of deliquescent. salt
would be preferable. In other words, a lower
ratio of the calcium chloride to the petroleum
hydrocarbon ‘under such conditions would check
excessive moisture absorption, which may be un-'
desirable because of possible excess drippage. 10
The formula given above, however, contains sum
cient calcium chloride to serve quite effectivelyv
under conditions of relatively low humidity, and _
also affords a substantial measure of ?re resist
15
ance under such conditions.
The low cost of such treating material is .very
advantageous and when the ?lter becomes
charged with dust so that the resistance to- the
passage of air is too great, the entire ?lter is dis
carded without involving any considerable eco
form which effectively retains dust, or other
nomic loss.
solid particulate impurities occurring in the air
and which contact with such surfac'es. Further
The bentonite serves to satisfactorily emulsify
the oil in the water and being inexpensive is quite
more, dust which adheres to these coated ?bers
acts as a wick, becoming permeated with the com
position and thereby enabling the latter to retain
additional dust.
An important advantage of this novel treating
composition is that the ratio of petroleum oil
to deliquescent salt can be established, so that
under various atmospheric conditions, sufficient
?reproo?ng effect can be obtained whereby the
hemp ?bers, which of themselves bum readily,
when coated with said composition do not sup
' port combustion on being subjected momentarily,
or for a short period, to a ?ame.
An example of my preferred'formula in per
centages by weight is as follows:
'
desirable in this connection. Other emulsifying
agents not adversely affected by the high con
centration of deliquescent salt will also serve
satisfactorily. It is believe d preferable to mix
the ingredients in the following order, namely,
water, bentonite, deliquescent salt and oil.
Examples of other formulas which may be suc
Per cent
Water
____
3'7 .5
Bentonite _____________________________ __
Calcium chloride ______________________ __
45
at 100° F.) __________________________ __
Neutral degras ________________________ __
Per centv
Calcium chloride ___________________ __-____ 36.5
Water--.
Technical white oil vis. 100 sec. Saybolt
Bentonite _____________________________ __
This formula produces a substantially odorless
product. Spray equipment, which is fed under a
slight pressure, is preferably employed to handle
the product without dilution with water, as the -
22.0
1.1
100.0 40
4.0
36.5
at 100° F _____________________________ __ 23.0
1.9
37.5
Light para?in oil (vis. 100 sec. Saybolt
Per cent
4° BentoniteWater
Calcium
___
_____
__
chloride ____ __, _______________ __
37.5
1.9
37.5
Technical white oil (vis. 100 sec. Saybolt
vat 100° F.) __________________________ __
23.1
100.0
texture thereof is short. Dilution with water,
v In the latter formula, a para?in oil having a
prior to spraying, if it is desirable, can be accom
viscosity of approximately>80 sec. Saybolt at 100°
d‘. has also been found satisfactory. However,
the formulas having the technical white oil have
been more satisfactory from the standpoint of the
elimination of odor.
plished by merely stirring the water into the
emulsion.
In the case of an air ?lter composed of a loose
55 assemblage of hemp ?bers coated with a composi
30
_ cessfully employed are as follows:
2
5
2,112,799
No ?re hazards of any kind exist during the
applicatlonolthe emulsion tothehemp?bers and
appreciable protectionlsextcnded the nberswhen
to collect solid particulate impurities occurrins in
air passed through the ?bers and to preclude
combustion when momentarily subjected to a
coetedwiththecompodtiomabovesettorth.
?ame.
.
Whatisclaimedis:
1. As anew articleol' manufacture, an In‘ alter
-
_
.
L'Iheartieleassetforthinclaimlinwhich 5
the ?bers are hemp. the‘deliquescent salt 18 cal- ,_
vegetnble ?bers canted with 3 mm
deposited from an emulsion of hydrocarbon oil-
clilm chloride, and. the oil is technical white 011
having a viscosity 0! 100 Seconds 8871101‘; 8'1
in-Inter containing a. dt salt and ben-
100" 1".
l0 tonite; the film so deposited being in an amount
'
'
7
ROBERT C. WILLIAMS-
l0
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