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Патент USA US3025973

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March 20, 1962
Filed March 13, 1958
3 Sheets-Sheet 1
F m.
FE 3
March 20, 1962
Filed March 13, 1958
5 Sheets-Sheet 2
March 20, 1962
Filed March 15, 1958
J. V . BAU
3 Sheets-Sheet 3
BY (7
Patented Mar. 20, 1962
FIGURES 4 and 5 are plan views of portions of FIG
URES 2 and 3;
FIGURE 6 illustrates one way of slitting and trimming
the product produced;
Jordan V. Bauer, 1001 Grand Ave., Keokuk, Iowa, as
signor of forty-?ve percent to Russell H. Curtis, St. 5
FIGURE 7 illustrates the manner in which the ?at
Charles, Ill., and ten percent to Richard L. Johnston,
product is wound into a cylindrical ?lter;
Arlington Heights, Ill.
FIGURE 8 illustrates the manner in which the product
Filed Mar. 13, 1958, Ser. No. 721,270
8 Claims. (Cl. 210-493)
This invention relates to an improved method of manu
shown in FIGURE 7 can be used as an oil ?lter, e.g., in
an automobile;
FIGURE 9 illustrates a partial plan section of FIG
URE 8;
facturing ?lter devices of the type disclosed in US. Pat
ent 2,599,604 and is directedto certain improvements
FIGURE 10 illustrates the manner in which a product
similar to that shown in FIGURE 7 can be used as an
in the fabrication of such ?lter devices, and to new and
useful products.
air filter, e.g., in an automobile to ?lter air going to the
U.S. Patent 2,599,604 disclosed a novel type of ?lter 15
element using a corrugated ?ltering medium in a unique
FIGURE 11 illustrates a multiple ?lter made in ac
cordance with the invention;
FIGURE 12 illustrates a multi-layer ?at ?lter utilizing
ing this ?lter element a strip of single faced corrugated
the products of the invention.
?lter paper, with con?ned ?utes along one edge of the
The new method of manufacture proposed in this in
strip sealed shut, is wound convolutely on a core. As 20
vention also uses single-faced corrugated ?lter medium
the strip is wound a sealing compound is extruded along
manner of construction.
According to one way of mak
the other edge of the strip so as to seal or plug the open
as the construction material for the ?lter element, but
?utes of the element during the winding operation. The
the procedure in ‘forming the ?ute seals has been changed
?rial result of this procedure is a cylindrical paper as
to overcome the drawbacks of the previous method.
sembly with the corrugations running parallel to the axis 25 present process also makes it possible to make a ?at prod
of the core, and with each of the ?ute passages through
uct which can be used as such or rolled as hereafter de
the element alternately plugged or sealed at one end, and
open at the other end. Thus, any ?uid that enters the
Single-faced corrugated paper is'a well known product
as used for packaging and wrapping purposes. It is pro
through the ?lter paper comprising the side walls of the 30 duced in large quantities by means of a machine known
as a “corrugator” or “single-facer.” It is manufactured
?utes to exit from the open ?utes at the other end of the
?lter element.
by means of a high speed continuous operation which
consists of corrugating one web of paper by means of
By this means there is obtained a ?lter device which
heated ?uted rolls, applying an adhesive to the tips of
is compact in size, rigid in structure and large in ?lter~
ing area. The drawback of this method of fabrication, 35 the corrugations and then bringing the corrugated web
into contact with a ?at web of paper and forming a bond
however, has been that it has not proved practical for
between the two sheets. The result is a continuous sheet
mass production methods of manufacture. Although
open ?utes at one end of the ?lter element has to pass
the present invention can be used to manufacture a ?lter
of so-called “single-faced corrugated paper” comprising
device of similar structure, it differs from the prior in
a corrugated sheet bonded at the tips of the corrugations
vention in that it presents an improved method of fabrica 40 to a ?at sheet of paper or so-called “liner.” For the pur
poses of this invention a corrugating machine of the con
tion which avoids the di?iculties involved in the former
ventional type may be used to make up the single-faced
manufacturing procedure, and makes the mass production
corrugated ?lter paper used in the fabrication of the ?lter
of such ?lter devices at low cost feasible.
One of the objects of the present invention, therefore,
is to provide a new and improved process for making 45 ' One way in which this process differs from the prior
?ltering devices of the type described.
invention of US. Patent 2,599,604 is that in the present
invention the operation of forming the con?ned ?ute seals
Another object is to provide a ?at product which can
on one side of the corrugated ?lter strip is done simul
be cut to suit the needs of the user and is capable of
taneously along with the corrugating operation, rather
being shipped and stored in the ?at state. Such a product
can be used as a ?at ?lter, or multiples thereof can be 50 than subsequent to this operation, and the second op
eration of plugging the open ?utes on the other side of
placed side by side and used as a ?lter for gases or
the corrugated ?lter strip is done in such a way that the
liquids. Moreover, this product can be rolled by the
product can be unwound to a ?at state and used in a
user into cylindrical form and inserted into a conven
tional cylindrical ?lter housing.
?at state or rewound to form cylindrical ?lters. The
A further object is to provide a product of the type 55 ?nal ?lter in either case consists of multiple layers of a
described in which elastomeric materials are used at least
single-faced corrugated material having predetermined
for blocking or sealing the open ?utes of a ?lter made
?utes plugged or sealed as herein described.
from a single-faced corrugated ?ltering medium and can
In order to clarify the above explanation it should be
also be used for sealing or blocking the con?ned ?utes.
understood that the term “con?ned” ?utes is used to
Other objects and advantages of the invention will be
designate the ?utes enclosed or con?ned between the
apparent from the following description in conjunction
with the accompanying drawings, in which:
corrugated and the ?at sheets, whereas the term “open”
?utes refers to the open or exposed ?utes of the corrugated
FIGURE 1 illustrates generally in elevation a form of
apparatus suitable for practicing the process of the in
FIGURE 2 is an enlarged view of a portion of FIG
ure 1;
FIGURE 3 is an enlarged View of another portion of
By performing the con?ned ?ute sealing operation si
multaneously at the time the sheet is being corrugated,
and performing the open ?ute sealing operation in the
manner herein described, three important advantages are
achieved over the prior method of fabrication.
First, it makes Practically the multiple production 'of
th? corrugated ?lter winding strips from a single Wide
width of the corrugated sheet. Second, by eliminating
the necesslty of, making the open ?ute seal during the
?nal com/0111i}: winding operation, that operation is no
kmger “messy” and complicated, but instead becomes a
prisin‘ga corrugated sheet of paper faced on one side with
Simple “'dry” winding procedure which can readily be
within the con?ned ?utes of the single-faced corrugated
sheet, a narrow ribbon or ?llet of a sealing compound 9 is
handled on a mass production basis.
Third, it makes it
a ?at sheet of paper. The adhesive 5 used in the corru
gating operation is preferably a conventional starch paste
of the type commonly used for corrugating purposes as
described in my United States Patent 2,051,025.
As the means of providing an area of closure or a seal
PDssible to use conventional existing types of paper ‘fabri
applied to the inside surface of the flat or “liner” sheet 7,
eating machinery to perform all of the major manufac 10 just before it goes into the corrugating machine. This
turing operations involved.
sealing compound 9 is extruded onto the paper by means
of an extruding nozzle 10 as is shown in the drawing. The
A primary feature of the invention, therefore, is a
method of preparing a sheet of single-faced corrugated
amount of sealing compound 9 applied, is so regulated that
when trapped between the corrugations and the liner, each
‘?lter medium ‘complete with both con?ned and open ?ute
‘seals formed in situ at the proper locations, so that the 15 con?ned ?ute is ?lled in and plugged to form a seal about
% to 1/2 inch wide running the length of the sheet.
For practical reasons it is usually desirable to make two
multiple of individual ?lter winding strips, each with both
{con?ned and open ?ute seals completed and ready for the
or more of these seals, ‘starting close to one edge of the
‘operation of ‘being wound on a core to form a ?lter
sheet and spacing them across the width of the sheet at a
20 distance equal to double the width of the ?nally desired
?lter element Winding strips. [As shown in FIGURE 4, a
Another feature of the invention is the production of a
product, suitable for the construction of ?lter elements
second nozzle 10:: is provided to extrude the second con
?ned seal. By using two confined ?ute seals in combina
‘when 'convolute wound on a core, consisting of a strip of
single-faced corrugated ?lter medium with the con?ned
tion with one open ?ute vseal, for example, a single wide
?utes along one edge sealed shut and the open ?utes along 25 sheet can be trimmed and slit to give two individual ?lter
the other edge ?lled in level with the top of the corruga
element winding strips, whereas with three con?ned ?ute
tions by means of an elastomeric sealing compound.
seals and two open ?ute seals, four winding strips could
A further feature of the invention is the production of
be obtained from a single wide sheet of the corrugated
corrugated ?lter elements suitable for the ?ltration of both
paper. The width of the paper used should be selected
liquid and gaseous ?uids by the methods of fabrication 30 of course so that a minimum amount of material would be
lost in side trim.
herein disclosed.
In referring to FIGURES 1, 2 and 3 illustrating the in
For purposes of illustration the use of two “con?ned"
?utes and one “open” ?ute seal was chosen to demon~
vention, FIGURE 1 is a diagram which illustrates the
method of fabricating a corrugated ?lter paper and the
strate the practice of this invention. To make each of
forming of the ?ute seals. It also demonstrates the func 35 these seals a separate nozzle is required for extruding the
‘sheet may be trimmed and slit to give either one or a
tion and relationship of the various equipment compo
sealing compound, only one, however, of the two nozzles
nents. FIGURE 2 is an enlarged detail showing the cor
required for the two con?ned (?ute seals is visible in the
diagrams in FIGURES 1 and 2 which illustrate the inven
rugating machine vand the method forming the “con?ned”
?ute seals. FIGURE 3 is an enlarged detail showing the
method of forming the “open" ?ute seals. FIGURES 4
and 5 show plan views of parts of FIGURES 2 and 3. In
tion, the second nozzle being shown in FIGURE 4.
As is illustrated in FIGURE 1, the single-faced sheet of
?lter paper 8, complete with two con?ned ?ute seals, after
passing out of the corrugating machine is carried over a
series of guide rolls 11 and 12 to a winding machine 14
each drawing when used to designate the same part.
Where it is wound into a large roll 15. This winding op
FIGURE 2 shows a diagram of a typical corrugating
machine. It comprises essentially of two ?uted corru 45 eration is performed under suf?cient tension to keep the
corrugated sheet 8 fairly taut as it is being w'ound. Just
gating rolls 1 and 2, mounted one above the other with a
FIGURES 1 to 5 the same reference numbers are used in
smooth surfaced so-called “pressure roll" 3 running in
previous to the roll winding machine 14, is located the
contact and parallel to the lower corrugating roll 2. All of
means for making the “open” ?ute seal. This consists of
these rolls are steam heated to about 350° P. so as to
an extrusion nozzle 16 whereby a narrow ribbon or ?llet
of sealing compound 17 is applied to the open ?utes of the
facilitate molding the paper. Adjacent to the lower cor
corrugated sheet 8, at a position midway between the
rugating roll 2 is a conventional roller type mechanism 4
closed ?ute seals.
adapted to apply an adhesive 5 to the tips of the corruga
Adjacent to, and in line with the extrusion nozzle 16, is
tions of the corrugated paper sheet 6 as it passes through
located a roll stand 18 holding a roll of narrow tape 19
the machine.
about 1 to 11/2 inches wide. This tape 19 is composed of
FIGURE 2 also illustrates the manner in which the ?lter
paper or other thin sheet material so coated or impreg
paper is made up into a single-faced corrugated sheet and
nated with Wax or other impervious material as to make it
the method forming the con?ned ?ute seals simultaneous
non-adherent to the sealing compound. The roll of tape
with the corrugating operation. In producing the corru
19 is so located that as the corrugated sheet 8 is being
gated ?lter sheet the paper is fed into the machine from
two rolls of ?lter paper mounted on roll stands adjacent 60 wound, the tape 19 is also wound along with the corru
gated sheet 8, in line with the ?llet of applied sealing com
to the corrugating machine. One sheet 6 is passed between
pound, so that the sealing compound 17 is trapped between
the upper and lower corrugating rolls 1 and 2 where it is
the corrugations and vthe “barrier” formed by the tape 19.
molded into corrugations, and then passes around the
The amount of sealing compound 17 applied is so regu
lower corrugating roll 2 and out of the machine between
65 lated that when thus con?ned between the corrugations
the lower corrugating roll 2 and the pressure roll 3.
and the tape 19 a section of each of the open ?utes is
As the corrugated sheet 6 passes down around the lower
?lled in level with the tops of the corrugations for an area
corrugating roll 2, an adhesive 5 is applied to the tips of
of about 3% to 1/2 inch wide, running the length of the
the corrugations by means of an adhesive applicator mech
sheet. After a full roll of the corrugated paper and tape
anism 4. The other sheet of ?lter paper 7 is fed into the
machine so as to pass between the pressure roll 3 and the 70 assembly 15 has been wound the sheet is cut off and a new
roll started. This completed roll is then tied so that it
lower corrugating roll 2 and meets the corrugated sheet 6
at this point. The adhesive bond between the corrugated
will not unwind and is set aside to age for 24 hours or
and the ?at sheet of ?lter paper is thereby formed, and the
more to allow the sealing compound to cure.
assembly passes out of the machine in the form of a con
After the sealing compound has cured the next step
tinuous sheet of single-faced corrugated paper 8, com 75 in the procedure is to unwind the roll of corrugated paper
15 and then slit the sheet into two individual ?lter wind
of such nature that they could be applied by any one
familiar with the art. As a variation, the ?lter element
ing strips. As the roll is unwound the barrier tape 19 is
stripped from the corrugated sheet and discarded. The
corrugated sheet is then passed through a paper slitting
machine where the edges are trimmed and the sheet slit
lengthwise down the middle of each sealed area. As a
may be wound on a solid or closed core, and mounted
in a housing designed for a straight flow through the ?lter
element, rather than using the hollow core arrangement
demonstrated in the examples.
Another example of a variation in design that would
still be within the concept of the invention, would be
result of this operation two ?lter winding strips are ob—
tained, each one with the con?ned ?utes along one edge
the construction of a ?lter element having two stages of
plugged shut and the open ?utes along the other edge
?lled in level with the tops of the corrugations. FIGURE 10 ?ltration in a single unit. This result could be obtained
by not slitting the single-faced corrugated ?lter sheet (as
6 shows a section of the single-faced corrugated ?lter
shown in FIGURE 6) into two separate ?lter winding
sheet 20 with two con?ned seals 21 and 22 and one open
strips. By leaving it intact, complete with its two con
seal 23, and illustrates how the sheet is trimmed and slit
?ned ?ute seals and one open ?ute seal, and then winding
to given two ?lter winding strips 24 and 25.
The next operation consists of cutting the ?lter wind— 15 it convolutely on a core, a ?lter element would be ob
tained that would have two stages of ?ltration in series
ing strips into lengths as required for the desired ?lter
contained in a single unit, as shown in FIGURE 11.
elements. Each length constitutes the paper materials for
an individual element, and when convolutely wound on a
core to form a cylindrical unit with the corrugations
For some purposes a dual or multistage ?ltration device
may be more desirable than a single stage unit.
FIGURE 12 illustrates how a ?at ?lter can be assem
running parallel to the axis of the core, each of the ?ute 20
bled from a plurality of ?at ?lter elements A to P, each
passages through the unit will be alternately plugged at
like 24 and 25 but united ?at and with alternate ends
one end and open at the other end. The assembled unit
reversed. The assembly is ?tted snugly in a rectangular
therefore meets the requirements of an effective ?lter
device in that any ?uid entering the open ?utes at one
The sealing compounds used for the purpose of this in
end of the unit must pass through the ?lter paper com 25
vention are an important factor in the successful appli
prising the walls of the ?ute before emitting from the
cation of the method of fabrication, and must meet cer
open ?utes at the other end of the unit.
tain requirements in order to perform satisfactorily for
The drawing in FIGURE 7 illustrates the manner in
this purpose. These requirements apply particularly to
which a corrugated ?lter winding strip 26, with the con
?ned ?utes 27 sealed along one edge and the open ?utes 30 the sealing compound used to form the open ?ute seals.
In the case of the con?ned ?ute seals a much greater
28 ?lled in along the other edge, is convolutely wound
on a core 29 to form the ?lter element.
One method of
constructicon in winding the corrugated ?lter strip on the
latitude is allowable and the requirements are not so
The properties required in a sealing compound to be
core is to paste or otherwise fasten leaders and tail strips
to the corrugated ?lter strip so as to facilitate attaching 35 used for the open ?ute seals are as follows:
( 1) It must have negligible shrinkage during curing to
the one end of the strip to the core and the other end
assure complete sealing and plugging of the ?utes;
to the body of the element when the winding operation
(2) It must be sul?ciently ?uid or ?owable to be
is completed. In ‘FIGURE 7 the tail strip 30 is shown
applied to the ?lter medium, and yet be su?iciently thixo
as attached to the corrugated ?lter strip 26. In starting
and ending the winding of the ?lter strip 26 a dab of seal 40 tropic in character that it will not ?ow out of position
after being applied;
ing compound is used to seal the gap that occurs at the
(3) It should be curable or capable of setting to a
junction of the corrugated ?lter strip with the leader and
tail strips.
A preferred method of construction, where consider
substantially immobile state;
(4) When cured the sealing compound must be ?exible
able ?uid pressures are to be encountered, is to wind 45 and rubberlike in character so that the ?lter winding strips
can be ?exed in the winding operation without fracture
the ?lter element to such a diameter that it is a snug push
of the ?lter medium or the seals;
?t into a cylindrical metal container. By thus enclosing
(5) When cured it must have su?icient strength to
the paper structure it will withstand high ?uid pressures
maintain an effective seal under any pressure conditions
without rupturing. FIGURE 8 illustrates, in elevation
and partly in cross-section, a ?lter using this type of
construction wherein the corrugated ?lter paper element
likely to be encountered;
(6) When cured the sealing compound must withstand
31 is wound on a tubular core 32 and enclosed in a cylin
drical metal can 33. The bottom 38 of the can 33 is
unit might be subjected;
any range of temperature conditions to which the ?lter
provided with spaced projections 39 which retain the
(7) It must withstand deterioration from oil, water or
?lter element in a spaced position above the bottom. 55 other ?uidls likely to come in contact with the ?lter
(See also FIGURE 9.) This forms a ?lter element car
(8) It is desirable that the temperature required for
tridge adapted for use in a conventional automotive oil
?lter housing of the center post type. The openings 34
and 35 permit mounting the ?lter cartridge on the center
post and gaskets 36 and 37 act as seals.
The arrows in
curing the sealing compound be low enough that exces
sive heating of the ?lter assembly is not required.
Available sealing compounds which are suitable for
the drawing indicate the path of oil ?ow through the
the purposes of this invention and which meet the re
quirements outlined above are the liquid types of poly
sul?de polymers, as described in Industrial and Engineer
FIGURE 10 illustrates, in elevation and partly in cross
ing Chemistry, vol. 43, No. 2, pp. 324 to 328 (February
section, a ?lter adapted for air ?ltration. In this exam
ple, the corrugated paper ?lter element 40 is wound on a 65 1951) which is incorporated herein by reference. Com
mercial products of this type are manufactured by the
tubular core 41 and enclosed in a metal housing 42.
Thiokol Chemical Corporation of Trenton, NJ. They
The arrows in the drawing show the path of air ?ow
are sold under the trade names of Thiokol LP-2 and
through the ?lter unit.
Thiokol LP-3. These liquid polymers with the addition
These examples illustrating the use of the invention
should not be construed as limiting the use of the inven 70 of a curing agent will convert to tough solvent resistant
synthetic rubbers at room temperatures. For the pur
tion to the particular purpose or structure chosen to
poses of this invention these materials are so compounded
demonstrate practice of the invention. The ?lter element
as to give a sealing compound ?uid enough to be ex-_
of this invention is suitable for other ?ltration purposes
than those illustrated. While different applications would
truded onto the moving web of paper, but su?iciently
require some changes in design, these changes would be 75 thixotropic that it will not ?ow out of position after '
being applied. An example of the formulation of a suit
able sealing compound for the purposes of the invention
may be made of metal, plastic or glass. By employing
these different materials of construction, it is possible
is as follows:
to adapt the broad concept of this invention to an in
numerable number of practical applications.
Base Compound
“Thiokol” liquid polymer LP-2 ________________ __ lOO
Semi-reinforcing carbon black _________________ __
acid _________________________________ __
The invention is hereby claimed as follows:
1. A process of manufacturing a ?lter element which
comprises continuously corrugating a continuous strip of
sheet material, applying adhesive to the tips of the cor
rugations of said sheet material, continuously applying a
l3 1 10 relatively thick, narrow strip of a sealing composition to
a continuous sheet of liner material in a predetermined
Curing Compound
Lead peroxide ______________________________ __
acid ________________________________ __
Dibutyl phthalate ___________________________ __
The base compound is mixed by means of a 3-roll paint
relatively narrow area running lengthwise of said sheet
of liner material, said corrugated material and said liner
material being permeable to ?uids but substantially non
15 permeable to solids, continuously bringing said liner
material into contact with said corrugated sheet material
so that it adheres thereto at the tips of the corrugations
by means of said adhesive and the con?ned ?utes be
tween the corrugated sheet and the liner sheet are plugged
mill. The curing compound is made by dispersing the
by said sealing composition in said predetermined area,
lead peroxide in the dibutyl phthalate on a 3-roll paint 20 continuously ?lling the ?utes on the surface of the cor
mill. The stearic acid is used to body up the mix and
rugated sheet which is opposite the surface adjacent the
keep the lead peroxide from‘settling.
liner with a ?owable elastomeric sealing composition in
The sealing compound is prepared for use by thor
a predetermined relatively narrow area running length
oughly mixing the curing compound with the base com
wise of said sheet but spaced transversely from said ?rst
pound in the ratio of 15 parts of curing compound to 25 mentioned predetermined area containing said ?rst men
130 parts of base compound. The mixed compound has
tioned sealing composition, said elastomeric sealing com
a working life of about 3 to 4 hours and at a tempera
ture of about 80° F. cures in about 24 to 48 hours.
The above described sealing compound is suitable for
both the open and con?ned ?ute seals. In the case of
the con?ned ?ute seals, however, the sealing compound
requirements are not as critical as those of the open ?ute
seals. For example, it is not essential that the sealing
compound used for the con?ned ?ute seals be of a ?exible
or elastomeric nature because when used in this position
a non-?exible sealing compound does not prevent the
?exing of the corrugated sheet. The sealing compound
used for forming the con?ned ?ute seals is, therefore,
not necessarily limited to the elastomeric type of com
position being one which sets on standing to a ?exible
substantially immobile seal which is impermeable to
?uids, continuously covering said elastomeric sealing com
position with a strip of a removable barrier sheet running
lengthwise, said barrier sheet being adapted to be stripped
from said elastomeric composition after the latter is set,
winding said combined corrugated sheet and liner con
taining-said barrier sheet into a roll, allowing the elasto
meric composition in said roll to set, thereafter unwind
ing said roll and removing said barrier sheet, and rewind
ing said corrugated sheet material containing said sealing
composition into a convolute ?lter element.
2. A method of manufacturing a paper product for
pound required for the open ?ute seals, but may consist 40 ?ltration purposes which comprises making a single-faced
of a less complex sealing material.
Examples of such
sealing materials would be polyvinyl acetate polymer
emulsions, and synthetic resin adhesives of the urea
corrugated sheet from ?lter paper and simultaneously
with the corrugating operation sealing shut the con?ned
?utes in selected areas running the length of the sheet by
formaldehyde and phenol-formaldehyde type. Other
means of a sealing compound, and then subsequently
suitable sealing adhesives or compounds will be apparent 45 ?lling in the open ?utes of the corrugated sheet level
to those familiar with the art. Additional means of
with the tops of the corrugations, at selected distances
supplementing the closure of the con?ned ?ute seals
from the con?ned ?ute seals by means of an elastomeric
would be by crushing or ?attening the corrugations of
sealing compound, and after the sealing compound has
the single-faced corrugated sheet along the area of the
cured, slitting the sheet lengthwise down the middle of
con?ned ?ute seals by means of pressure applied to those
each of the sealed areas to produce two or more individ
areas when the single-faced corrugated sheet emerges
?lter strips each having the con?ned ?utes sealed
from the corrugating machine. The con?ned ?utes can
along one edge and the open ?utes along the other edge
also be closed by seams such as shown at 5 in FIGURE
?lled in level with the tops of the corrugations by means
1 of US. 2,599,604.
of said sealing compound.
The paper or other ?brous sheet materials used for '
3. A_ product suitable for use in making ?lter elements
the purposes of this invention should be of such porosity
as to be suitable for the ?ltration usage involved.
would preferably be prepared in the paper mill to meet
such speci?cations as: ?ber composition and structure,
which comprises a corrugated sheet material united at the
tips of the corrugations to a liner sheet material thereby
forming con?ned ?utes between the corrugated sheet
material and the liner sheet material and open ?utes on
porosity, caliper, bursting strength, etc. Further require 60 the
surface of the corrugated sheet opposite the surface
ments might be treatments with synthetic resins or other
to said liner, said sheet materials being permeable
materials for the purpose of imparting water resistance,
but substantially nonpermeable to solids and
wet strength, sti?'ness or other desirable properties to the
capable of acting as a ?ltering media, the con?ned ?utes
?lter paper sheet.
It will be understood that the ?ltering unit disclosed 65 being sealed in a predetermined area and the open ?utes
being ?lled in level with the tops of the corrugations by
herein is not limited to ?ltering the oil in automotive
means of an elastomeric sealing composition in another
engines. The unit is also well adapted for ?ltering other
predetermined area spaced from said ?rst predetermined
types of ?uids or for removing entrained particles in
area, said elastomeric sealing composition being ?exible
gases. While different applications of this nature would
require minor changes in design and possibly different 70 in character so that said product can be wound without
fracture of said permeable sheet materials and without
materials of construction, these changes are considered
to be of a nature that anyone familiar with the art can
apply. For example, the corrugated ?lter element may
_be fabricated from sheets of glass ?ber mat or cloth
fracture of the seal produced by said sealing composition.
4. A product as claimed in claim 3 in which the elas
tomeric sealing composition is provided with means to
‘rather than from‘ paper, and the core of the ?lter element 75 prevent said elastomeric sealing composition from adher
ing to said liner sheet when the resultant material is
wound convolutely with the corrugations facing inwardly.
5. A paper product suitable for fabricating ?lter ele
ments which comprises a strip of single-faced corrugated
?lter paper with the con?ned ?utes sealed shut adjacent
one edge and the open ?utes adjacent the other edge ?lled
in level with the tops of the corrugations by means of
an elastomeric sealing composition which is ?exible in
character so that said product can be wound without
fracturing the ?lter paper and without fracturing the 10
sealing composition.
6. A paper product as claimed in claim 5 in which
the elastorneric sealing composition is covered with a strip
of a material so that the elastorneric composition before
it is set does not come directly in contact with surfaces 15
rather than said strip and said ?utes,
7. A ?lter element consisting of multiple layers of the
product of claim 3.
8. A ?lter element constructed of a product as claimed
in claim 3 convolutely wound to form a cylindrical ?lter
References Cited in the ?le of this patent
Hazell _______________ __ June 28, 1938
Wellborn _____________ __ Apr. 4, 1950
Bauer ______________ __ June 10, 1952
Root _____ -2 _________ .. Oct. 18, 1955
Cox _________________ __ Dec. 6,
Rabbitt ______________ __ Jan. 24,
Fricke _______________ __ June 5,
Jaume _______________ __ Apr. 21,
Great Britain _________ __ July 28,
Great Britain __________ __ Jan. 2,
Great Britain ________ .. Mar. 20,
Austria ______________ __ Ian. 25,
France _______________ __ July 13,
“Industrial and Engineering Chemistry,” vol. 43, No.
2, pp. 324-328, February 1951-.
Patent No, 3,025v963
March 20“ 1962
Jordan V0 Bauer
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
Column {3, line 33, for "constructicon" read
—- cogstructlon -—; column 9, line 16, for "rather" read
Signed and sealed this 31st day of July 1962,
Attesting Officer
Commissioner of Patents
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