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Патент USA US2403261

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July l2, 1946.
Fi1ed~Apri1 1_, 19'44
Patented July 2, 1946
Llewellynn J. Clark, Grand Rapids, Mich., assign
or to The Tanglefoot Company, Grand Rapids,
Mich., a corporation of Michigan
Application April 1, 1944, Serial No. 529,063
2 Claims. (Cl. 183-75)
My invention relates to ñlter structures adapt
ed particularly for cleaning or conditioning air
outer sheets I0 and II and
the intermediate or spacer sheet I2. The outer
` inar and comprises the
' or other gases by withholding and removing dust
sheets I 0 and II are coated on one side with
and other particles from the flowing air. More
specifically, the invention contemplates the pro
duction of filtering structure in which flow pas
sageways are provided whose walls have sticky
or tacky substance applied to their inner faces
so that dust or other foreign matter flowing
sticky substance I3, the spacer sheet I2 being
interposed between the sticky sides of the outer
sheets to be bonded thereto by- the sticky ma
terial. This intermediate 0r spacer sheet isof
sinuous cross section or corrugate form the crown
caught by the sticky substance and thus with
or apex portions I5 being engaged by the sticky
sides of the outer sheets so that the resulting
passages I4 will be vclosed except for longitudinal
drawn from the. flow for cleaning and condition
flow therethrough of air or gas. With >this ar
ing thereof.
So-called “Tanglefoot” sticky iiypaper has been
rangement the sticky material on the outer sheets
between the crown portions of the corrugation
in use for many years for catching insects, and
one of the objects of the invention is the utili-4
'will be exposed to the interior of the passages,
zation of such paper sheets coated with sticky
substance in the production of iilter fabric'or ele
_ments for filtering and- cleaning air or other
will creep a distance along the side walls of the
passages to increase the sticky area exposed to
air or gas flow. Dust or other foreign particles
through the passageways with air or gas will be
but, by capillary attraction, the sticky substance
20 in the air flow will strike the sticky surface‘and
In accordance with my invention the filtering
will be withheld from the flow for cleaning and
conditioning thereof. In orderto increase the
effectiveness of withdrawal of dust and foreign
particles from the air iiow by the sticky sub
fabric or element may be in sheet form compris
ing an intermediate channeled or corrugated
sheet between outer sheets of paper coated on
their inner sides with tacky substance which acts
“ stance, the intermediate sheet I2 may be con
as a bond to secure the' outer sheets to the in
termediate sheet, and which is exposed in the
passages deñned by the sheets for catching and
withdrawing dust or other foreign matter from
the air or gas flowing through the passages.
structed so that the channels therein are longi
tudinally wavy or sinuous as indicated at I 6, Fig
ure 2. With this arrangement the sticky area '
exposed to dust or other particles in the passages
30 I4 will be materially increased without any sub
From the ñltering fabric thus formed, various
types of filter structures may. be produced. For
stantial interference with or reduction of the air
iiow through the passages.
example the filter fabric may be cut into small
The sticky substance should be such that it will
be non-running but sufliciently tacky through a
sheets or units which may be assembled and ar
ranged in various ways for flow of the air or gas 35 relatively wide range of temperature. For exam
through the sticky passages of the assembly,
The various features and utility of my inven
tion will become apparent from the following
specification and accompanying drawing, in
which drawing:
ple, the sticky substance could be such that it
would not run at 135° F. and would still stay
tacky at _20° F. A formula to be used might be
the following:
Per cent
. Non-drying vegetable oil from ________ __ 25 to 35
Figure 1 is a transverse section of a portion of
Blown non-drying vegetable oil _______ __ 5 to 10
the ñlter fabric or element;
’ Wood rosin__'_ ______________________ __ 55 to 65
Figure 2 is a plan View of a portion of the in
Vegetable wax (carnauba wax) ______ __ 2 to 6
termediate or spacer element of the fabric;
In the`v fabrication of the ñlter units or sheets,
Figure 3 shows the end of a filtering structure
the outer sheets I0 and I I are preferably of paper
formed by rolling or winding up a length of the
impervious to the sticky substance so that the
filtering fabric;
outer sides thereof will not be sticky. The inner
Figure 4 is a cross section of a filter structure
or spacer element I2 could be of paper of a y
in which the sheets of the filter fabric are assem
bled in stepped relation for intercepting air or 50 more ñbrous or porousnature so that the sticky
substance from the outer layers may travel there
gas flow for cleaning thereof; and
along by capillary attraction or ooze through the
Figure 5 Vshows sheets of the fabric assembled
pores thereof, thus to further increase the sticky
within a rectangular housing to form a filter
area exposed in the passages I4 to the air or
structure cell or unit.
Referring to Figure 1 the filtering fabric is 1am 55 gas flow.
of such viscosity as to be retained as a coating
on the walls for removing dirt from air flowing
through said passages, said unit consisting of
two fibrous outer sheets of material impervious
Figure 3 shows a cylindrical ñlter structure in
which a band of the ñlter fabric is wound into
a roll I1 and housed within a tubular container
I8. A ñlter structure of this shape may be
readily included in piping through which Vair or
gas Yñows to be cleaned by the filter roll.
Figure 4 .shows a filter structure in which a
to the tacky substance Yused to prevent the outer
surfaces of the outer sheets from becoming sticky,
an intermediate sheet of sinuous form between
saidouter sheets to separate them, said interme
diste sheet being pervious to the tacky substance
' fabric are stacked together'in stepped relation
within a suitable container or housing 29 having 10 yused, the inner surfaces of the outer sheets being
an inlet opening 2| Vin one side and an outlet' " coated with a tacky substance, said tacky sub
opening 22 in the other side. When this filter " ' stance constituting the sole means for bonding
plurality of rectangular sheets I9 of the ñlter
the intermediate sheet to the outer sheets to com
structure is placed in the path o_f air. or gas to ..
be cleaned, the air or gas will' flow-»throughthe '
plete the unit,l the said three sheets forming va
ñlter unit defining ñow passages for circulating
air in which the exposed tacky substance'serves
inlet opening 2l for distribution of theñow .15
'_ through
outflow from
the passages
the other
I4 of
ñlter sheets
into the
to remove the dirt from the flow.
2. -A self-supporting air ñltering unit formed
outlet 22 of the housing.
Figure 5 shows a plurality of rectangular sheets i ' with a plurality of air passages through ithav
23 of .the Vvfilter fabric, assembled in a _vertical 20 ing a tacky substance on the walls of saidpas
sages of such viscosity as to be retained as a
stack Within va rectangular, box ,or‘ housing 24_
to _form .aiiltering structure unit or cell which
coating Ion said walls for removing dirt from air
flowing through said passages, said unit consist
may beused alone or of which ar number could
beajssembled and arranged to form a iilter strucè,
ture.. VAOther forms .and _shapes yof íilter .structures
`couldreadily- be builtup by lengthsor unit pieces
of thei'llter fabric.
_ ._
_Itwilllof Vcourse _be _understood `that various
Y _ details >of construction .and arrangement may be
varied throughv a wide range without departing
_ from .the ¿principles of thisinvention jand~ it is’V
therefore not _the purpose to. limit vthe patent
granted hereon. otherwise than necessitated by
thescope'of the appended claims.
YI_ claim as my invention;> ._
Y '
1. .A self-_supporting air filtering unit formed
with a plurality of air >passages through it having
a tacky substance on the Walls of said passages
ing of two outer1 sheets spaced apart and an
intermediatezsheet of sinuous form separating
theouter sheets and deíining a plurality' of air
passages through said unit, a tacky substance
covering theinner surfaces .of the outerv sheets
__ and the intermediatejsheet, the said sheets being
of iibrous material unlike in perviousness to the .
Ytacky substance, the outer sheets being impervi
ous to the tacky substance to prevent the outer
ysurfacesthereof from becoming sticky yand the
. intermediate „sheet being porous andîpervious to.
the tacky substance so that-said substance may
travel therealong by capillary action through the
pores of said intermediate sheet.
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