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Патент USA US2406057

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Aug. 0, 3945.
w. H. ARRETT ET AL.
COATING APPARATUS
Eiled NOV. 30, 1944
3 SheeiIZS-Sheei‘ 1
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William H. Boar-refit
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' \N. H. BARRETT ET AL
COATING APPARATUS
Filed Nov. '50, 1944
5 Sheets-Sheet 2 .
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Aug. 2@, 1946;
_ W, H, BARRETT ET AL
I
_
'
7 2,406,057
COATING APPARATUS
' Filed Nov. so, 1944
s Sheets-‘Sheet s
INVENTORS:
Wmlliqm HjBarr-ejl‘f.
BY Bernard K‘Asdell
ATTORNEY
‘
'
2,405,057
Patented Aug. 20, 1946
UNHTEDV STATES PATENT OFFICE
2,406,057
COATING APPARATUS
William newer: and Bernard K. Asdell, Inter-‘
national Falls, Minn, assignors to Minnesota
and Ontario Paper Company, Minneapolis,
Minn.
Application November 30, 1944, Serial No. 565,926
12 Claims.
(Cl. 91-49)
1
2
This invention relates to the art of coating
sheet material and more particularly to coating
tinuous manner while moving at high rates of
Figure 4 is a sectional view‘with parts broken
away of the‘ fountain which shows the lower‘ nip
formed by the applicator roll and the metering
roll having an excess of coating material therein;
speed.
and
webs of paper which can be processed in a con
There are numerous methods of coating a web
material such as paper having the desired ob
Figure 5 is a view of the back of the fountain
ject of applying coating that will be smooth, uni
shown in Figures 2 and 3.
Referring to the drawings in detail: [0 indi
form in appearance, and of a desired Weight or
cates a web of paper coming from a source not
thickness.
10 shown; the web of paper passes roll II and then
roll l2- and then into contact with the backing
It is an object of this invention to provide an
means or drier roll 13. The coating material to
apparatus which will apply such a ?lm of coat
be applied to the web of paper on the backing
ing material to a web of paper traveling upwards
means 13 is supplied to a fountain l4 and the
of two thousand feet per minute. By the term
paper as used herein, it is intended to include 15 surplus coating material from the fountain flows
over the back side ‘of the fountain and into a
any and all materials in sheet form wherein a
container 23. A resilient surfaced applicator roll,
coating may be applied and treated in accord
I6 is so mounted that it contacts the paper upon
the backing means and dips into the fountain
Another object of this invention is the pro
vision of a coating unit so arranged that the 20 l4. Mounted in the fountain at a selected dise
tance from the applicator r011 I6 is metering
coating materials having wide variations in solid
roll I5 and it is generally preferred that the me
content may be applied to a fast moving web of
tering roll be a hard surfaced unit. This meter
paper in a predetermined weight per unit of
ance with this invention.
paper.
The coating apparatus disclosed in co-pending
application, Serial No. 511,753, ?led November
24, 1943, provides an excellent coating on the pa
per, but it has the disadvantage that at speeds
upward of two thousand feet when coating pa
ing roll controls the amount of coating material
which is carried by the applicator roll l6. Im
mediately above the applicator roll at a selected
distance therefrom is mounted a hard surfaced
doctor roll IT. This doctor roll removes a por
tion of the coating material on the applicator
per of over one hundred inches in width that the 30 roll I6 and smooths upon the' applicator roll’s
doctor roll tends to de?ect. The deflection of the
doctor roll at high speed tends to result in an
uneven coating across the width of the sheet of
paper. It has been discovered that if the doctor
periphery the coating material remaining there
apparatus;
that herein described.
on.
The doctor roll I‘! is generally a hard sur
faced roll and has its periphery wiped substan
tially clean by‘ a resilient surfaced roll 18 which
roll is supported between the rolls, the problem 35 is mounted immediately above the doctor roll.
To remove the coating from the resilient surfaced
of de?ection at high speed is substantially if not
roll, a doctor blade I9 is provided. The coating
completely overcome.
material removed by the doctor blade is returned
Additional features of the invention reside in
through troughelike member“ and pipe 2| to
the coating fountain, the applicator roll, and pro
visions whereby pressure applied to the appli 40 coating container 23. The coating material in
the container 23 is withdrawn by pump 25 and
cator roll and the doctor roll can be determined
forced through pipe 26 and into fountain [4 ad
and controlled. The invention has numerous
jacent the top of the fountain.
‘
other features which will be hereinafter described
When applying coating of ten pounds or more
in detail and particularly pointed out in the
45 per side to a web of paper, it is preferred that
appended claims.
such coating be applied in two applications rather
In the drawings forming a part of this inven
than in a single application. As disclosed in Fig
tion, similar reference numerals indicate corre
ure 1, coating units generally indicated at 40,.
sponding parts in all the drawings in which:
4], 42, and 43 are of identical construction as
Figure 1 is a side elevational view of a coating
Figure 2 is a view of a modi?ed form of the
‘
The paper [0 after having the coating applied
invention;
by applicator roll I6 of coating unitlo' passes
Figure 3 is a second modi?cation of the coat
ing apparatus in which a nest of the driers are
around a substantial portion of the surface of the
drier l3. After the coating has'at least pre
used in place of one large drier;
65 liminarily set, a felt is brought in contact with
2,406,057
3
4
the paper for a portion of its travel over the
of coating material is maintained with a head
drier surface.
higher than the nip formed by the applicator
Some of the reasons for the use
of the felt is to prevent drier wrinkles, and to
hold the paper in close contact with the drier
surface. The felt passes over rolls 33, 34, and v
35 and 36 and then comes in contact with the
coated paper. The felt leaves the surface of the
roll and the metering roll. The excess coating
from the fountain shown in Figure 1 is returned
to the container by pipe 22. A resilient surfaced
applicator roll l5 rotates into the fountain and
picks up coating in excess to that to be applied to
paper atrroll 28 and the paper and the felt travel
the paper. A metering roll or doctor roll I5 which
together over rolls 30, 3| and 32.
is positioned at a selected distance from the ap
The paper then receives its second ?lm on the 10 plicator roll surface l6 controls the amount of
same side by coating unit 4| and then passes
coating on the applicator roll. The coating on
around drier roll 37. The paper leaves the drier
the applicator roll after passing metering roll I5
roll at roll 46. The felt 154 contacts the paper on
is smoothed and a portion removed by rotating
a portion of its travel around the’ surface of the
hard surfaced doctor roll H’. The hard surfaced
drier 31 and this felt leaves the surfaceof the 15 doctor roll may be composed of various materials
paper at roll 45 and then the paper and the felt
travel together over rolls 41 and 48‘. The felt
which is endless then passes over rolls 49, 59,
'
and 5|. The paper continues over roll 52 and ,
then is carried by felt 53 over rolls 54, 55 and 56. 20
The felt 53 then travels over rolls 5T, 58, and 59.
The coated paper after leaving felt 53 passes in
contact vwith roll 60 and thenreceives its ?rst
but it is‘ believed essential that the hardness of the
doctor roll I1 be considerably harder than that
of the resilient applicator roll IS.
The coating
material removed by doctor roll IT is wiped from
the surface of this roll by resilient surfaced roll
I8 and any coating material removed by the roll
I8 is doctored therefrom and returned to the
' coating container.
coating on the opposite side by coating unit 43.
The rolls I6 and H are supported by upright
The‘ coated paper travels around a substantial 25 member 85 which is pivoted at 84. The doctor
- portion of the surface of the drier 39 and leaves
roll I 5 is supported by a member which is pivoted
the drier surface at roll 64. . The'felt 5! which
at 91. ' The purpose of the pivot of doctor roll and
the applicator roll is to permit separation of the
applicator roll from the doctor roll and the doctor
of the paper on the drier. The paper travels 30 roll from the drier surface. To control the
with felt BI over rolls' 65, 65, and 6?. The end
amount of pressure applied by metering roll or
lessfelt?l then passes over rolls 59, ‘I0 and 62,
doctor roll I5 to the resilient applicator surface
then back in contact with the coated surface of
I5 is a pressure adjusting rod 88 vsecured to the
the paper. The paper after leaving the roll 6?
metering roll support. This rod is connected
passes around the surface of the drier 39 and 35 to an eccentric 89 and extending from this eccen
contacts the paper on thes'urface 'of the ‘drier
39 passes 'over roll ‘63 after leaving the surface
receives its second coating on the opposite side
of the sheet by coating unit: 42. The coated
tric 89 is'handle 99. By turning the handle 90
the pressure between the rolls I5 and I5 can be
paper is contacted on a portion of the “drier sur
controlled and varied. A member 9| is hingedly
face 38. by felt ‘II. The felt parts. contact with
connected to the member 85 at 92, and this mem
the surface'of the coated paper at roll ‘I3. for a 40 ber'is pivotally connected to upright member 94
space ‘while the coated paper travels 'to and
at 93. The upright member 94 is pivoted at one
end of 95 and connected at the other end to
around the roll ‘I4 and thereafter the felt and
member 96. The member 96 is connected with
paper pass over rolls 15, ‘I6, and ‘IT. The paper
a hydraulic or other power cylinder 9'! for vary
then passes over roll 8i to suitable means not
shown, for winding in rolls;
‘
'
4
ing the pressure of the coating unit against the
drier surface. For supporting the roll I8 is mem
ber 98 secured to the'roll‘ and pivotally secured
to the upright member 94 at 99. For varying the
In Figure 2 of the drawings, there‘is shown a
modi?cation of the apparatus disclosed in Figure
1, and in this modi?cation, the paper I9 passes
over rolls II and I2, and then into contact with
pressure between the rolls I6, I7, and I8 there
the surface of a heated drying roll.
is provided a member I99 which connects mem
The paper
ber 9| and 98 through the medium of eccentric
IIH. For turning the eccentric there is provided
the drier roll leaves that surface and passes over
a handle I92 whereby the pressure between these
a jump roll ‘I03 and then back into contact with
rolls may be varied and controlled.
the drier surface. The paper leaves the surface
Although the contact of the coated paper with
of the drier at roll 29.' The coated surface of the
the‘ drier surface in the modi?cation vshown in
paper is contacted on aportion ‘of its travel over
Figure 2 is less than that shown in Figure 1-, the
the'd'rier surface with a positively driven felt.
rate of speed of drying is expedited by the fact
The purpose of this felt is to eliminate to a great
that the steam generated in the drying coated
extent, if not completely, the formation of drier
wrinkles and also to hold the coated paper in 60 paper is permitted to be dissipated while the
paper is out of contact with the drier surface.
close contact with the drier surface. The endless
In Figure 3 is shown another modi?cation
felt leaves the surface of the coated paper and
wherein the single drying roll is replaced by a
passes over roll'28' where the coated paper and
nest of drying rolls. The paper ID in this modi
the felt travel together for a given distance.
?cation as it passes over roll Ila, which in some
In the coating of paper on the felt side, it some
cases is heated so as to bring the temperature of
times occurs that, this surface of the paper is
the paper to be coated to approximately the tem
resistant'to the absorptionof moisture, and the
perature of the coating material. In this modi
moisture from the coating material does not uni
?cation, the backing roll I95 contacts the paper
formly wet the‘ paper; This di?iculty may be
as the coating is being applied by resilient roll IS.
overcome by lightly brushing the surface of the
The paper after being coated passes around the
paper. This is accomplished‘, in Figure 2 by'_hav-'
surface of drying rolls I06, I61, I98, and I09. 'At
ing the surface of the paper lightly contacted with
the surface of the roll I8.
the drying roll I09, the coating surface of the pa
The coating material is pumped from a suitable
per is in contact with the heated surface. It is to
coating container to a fountain wherein a pond, 75 be understood that the nest of rolls may vary‘
after traveling over 'a'portion of the surface of
5
6
in size from each other and in number depending
uponthe amount of drying surface necessary to
set the coating material.- Also, a nest of drying
ceiving'coat-ing from the fountain, 'aimetering
rolls has the advantage over a single drying roll
in that it permits a controlled temperature to be
used in the drying of the coatingmaterial. For
example, the temperature on roll I06 may be from
selected distance‘ therefrom, and a roll above the
doctor roll and contacting the surface of the
225-275" F., while the temperature of roll I01
roll at a selected distance from the applicator
roll, a doctor rollabove the applicator'roll at'a
doctor roll.
-
'
4. A coating apparatus comprising,- a backing
roll, an applicator roll having a surface with re
silient properties, a fountain having an open side
may be varied from 275-325“ F., and the tem-'
perature of the roll I08 may be varied from 325 10 directedtoward the applicator roll- so that the
fountain and the‘ applicator roll form a coating
375° F. While the temperature‘ of the roll I09
container, a hard surfacev metering roll mounted
may be considerably above the temperature of
in the fountain at ‘a selected distance from the
the other rolls without resulting in damage to
applicator roll, a doctor roll above the applicator
the coated surface. The coating material is sup
roll at a selected distance therefrom, and a roll
plied to the container 23 and this coating is re
for cleaning thesurface of the-doctor roll.
moved by pump 25 and passes through line 26 into
.5. A coating unit including a, backing cylin
the fountain M. A- sufficient head of coating
drical» member, a fountain, an applicator roll re
material is maintained in the fountain l4 so that
ceiving coating from the fountain, a metering roll
the lower nip of the metering roll and the ap
plicator roll is ?ooded. Thisassures that foam 20 at a selected distance from the applicator roll,
ing of the coating material will be substantially
a doctor roll above the applicator roll, and at a
if not entirely eliminated. The coating material
on the resilient surfaced applicator roll 16 after
selected distance therefrom, and means for sep
arating the metering roll from the applicator roll,
and means of separating the applicator roll and
it passes the metering roll is smoothed and a
,
portion of it removed by hard surfaced doctor roll 25 the backing roll.
6. A coating apparatus comprising, a backing
H. A portion of the coating material on the
roll, an applicator roll with a surface having re
surface of the doctor roll I1 is removed by re
silient properties, a fountain having an open side
silient surfaced roll M which has its surface
directed toward the applicator roll so that the
cleaned by a suitable doctor blade and the coat
ing material so removed is returned to the coat 30 fountain and the applicator roll form a coating
container, a metering roll mounted in the foun
ing container 23. The direction of rotation of
tain at a selected distance from the applicator
the rolls is disclosed in Figure 3, and the direction
roll, a doctor roll above the applicator roll and
of rotation is the same in each of the apparatus
shown. It may be pointed out that the surplus
at a selected distance therefrom, a roll above the
coating material is pumped to the fountain and 35 doctor roll for cleaning the surface of the doc
tor roll, and means for cleaning the surface of
the back of the fountain is lower than the side
the roll cleaning the surface of the doctor roll.
walls for permitting the coating material to flow
'7. A coating apparatus comprising, a backing
over the back of the fountain l4 and return to
roll, an applicator roll for transferring coating
the coating container 23.
When using mineral-adhesive coating material 40 material to a moving web of paper, a fountain
having an open side directed toward the appli
it is preferred that the solids content of the coat
cator roll so that the fountain and the appli
ing material be above 60% solids, and generally
cator roll form a coating container, a doctor roll
within the range of about 61% to 75% solids.
above the applicator roll and at a selected distance
The apparatus and process herein disclosed per
mits the coating of paper from about four hun 45 therefrom, a roll mounted above the doctor roll
and adapted to contact the surface of the doctor
dred feet per minute to about two thousand feet
per minute without changing the viscosity or
roll, and a doctor blade for cleaning the surface
other characteristics of the coating material.
of the roll that contacts the surface of the doc
It is to be understood that changes, modi?
tor roll.
8. In a coating apparatus comprising, a back
cations, etc., may be made by those skilled in the
ing means for supporting a moving web of paper;
art without departing from the spirit of the inven
resilient surfaced applicator roll for transferring
tion as described herein.
What is claimed:
coating material to paper supported between the
1. In a coating unit including a backing means,
backing means and said roll, a fountain having
an applicator roll for transferring coating mate 55 an open side directed toward the applicator roll
rial to a material to be coated supported by the
so that the fountain and the applicator roll form
backing means, a fountain having an open side
a coating container, a metering roll mounted in
directed toward the applicator roll so that the
the fountain maintained at a selected distance
fountain and the applicator roll form a coating
from the applicator roll, a doctor roll above the
container, a metering roll mounted in the foun 60 applicator roll and at a selected distance there
tain at a selected distance from the applicator
from, a roll mounted above the doctor roll for
roll, and a doctor roll above the applicator roll
contacting the surface of the doctor roll, means
at a selected distance therefrom.
for cleaning the surface of the roll that contacts
2. A coating apparatus including a backing roll,
the doctor roll surface, and means for returning
an applicator roll for transferring coating mate 65 the coating material to the fountain removed
rial to a moving web supported by the backing
from the roll contacting the surface of the doctor
roll, a fountain having on open side directed to
roll.
9. A coating apparatus comprising, a backing
ward the applicator roll so that the fountain and
applicator roll form a coating container, a doc
roll, an applicator roll for applying coating ma
tor roll above the applicator roll at a selected 70 terial to a traveling web of paper, a fountain hav
distance therefrom, and a roll mounted above the
ing an open side directed toward the applicator
doctor roll and contacting the surface of the
roll so that the fountain and the applicator roll
form a coating container, a metering roll mounted
doctor roll.
3. A coating unit including a backing cylin
in the fountain at a selected distance from the
drical member, a fountain, an applicator roll re
75 applicator roll, a doctor roll mounted above the
2,406,057
applicator roll and at a selected distance there
from; a roll for, cleaning the surface, of they doc
tor rolLand means for controlling the pressure
between the applicator roll, the doctor roll and
the roll for cleaning the doctor roll surface.
10. In combination with a nest of coated paper
driers, a backing means, a fountain having an
8
tance from the applicator roll, a hard surfaced
doctor roll mounted above the’ applicator roll
and’ at a selected distance therefrom, and a re
silient surfaced roll mounted above the doctor
roll for cleaning the surface of the doctor roll.
12. A coating unit including a backing roll, an
applicator roll for transferring coating material
to a web of paper and the like supported by the
open.’ side, an applicator roll for rotating into and
out of the fountain at the open side, a metering
backing roll, a fountain having an open side di
roll mounted in the, fountain at a selected dis 10 rected toward the applicator roll so that the
tance fromrthe applicator roll, a doctor roll
fountain and the applicator roll form a coating
mounted above the applicator roll and at a se
container, a metering roll at a selected distance
lected ‘distance therefrom, and means [for clean
from the applicator roll for controlling the
ing the surface of the doctonroll.
, _
A
_
amount of coating material carried by the appli
11. In a coating apparatus comprising, a back 15 cator roll from the coating container, and a
ing means, an applicator roll having a surface
with resilientrpropertiesa fountain having, an
openside directedtoward the applicator roll ‘so
that the applicator roll and the fountain form
a coating container, a hard ‘surfaced ‘metering 20
roll mounted in the fountain at a selected dis
doctor roll at a selected distance from the appli
cator roll for smoothing the coating on the said
applicator roll.
WILLIAM H. BARRETT.’
BERNARD K. ASDELL.
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