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Патент USA US2130060

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Sept. 13, 1938.
R. ‘s. BRACEWELL
2,130,060
METHOD AND APPARATUS I, FOR COATING PAPER AND THE LIKE
‘ Filed Aug. 26, 1955 -
A;
14.!
4 Sheets-Sheet 1
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‘
INVENTOR
lQ/Yssaz. 6: BRACEWELL
1477M.
ATTORNEYS
Sept. 13, 1938.
R. s. BRACEWELL
2,130,060
METHOD AND APPARATUS FOR COATING PAPER AND THE LIKE
Filed Aug. 26, 1955
4 Sheets-Sheet 2
INVENTOR
,
51698544 6 BR4C£W£4
WwY77ml
ATTORN EYS
Sept 13, 1938.
R. s. BRACEWELL
2,130,060
' METHOD AND APPARATUS FOR COATING PAPER AND THE LIKE
Filed Aug. 26, 1935'
4 Sheets-Sheet s
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, 'INVENTOR
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{:(PU-S‘SELL ‘@Bmcswm
ATTORNEYS
Sept 13, 1938.
R. s. BRACEWELL
2,130,060
METHOD AND APPARATUS FOR COATING PAPER AND THE LIKE
Filed Aug. .26, 1955
4 Sheets-Sheet 4
lN\-IENTOR
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$188621.
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BY
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A TORNEY?
Patented Sept. 13, 1938
2,130,060
/
UNITED STATES
PATENT OFFICE A
2,130,060
METHOD AND APPARATUS FOR COATING
PAPER AND THE LIKE
Russell S. Bracewell, South Hadley, Mass.
Application August 26, 1935, Serial No. 37,844
15 Claims. (01. 91-44)
This invention relates to coating webs of paper
and the like and has for its object the provision of
a method and apparatus by which traveling webs
may be coated, while traveling at relatively high
5- speeds, in a uniform and satisfactory manner
with the degree of reliability necessary for com
mercial operation.
.
An important feature of the invention is the
provision of a high speed rotating spray roll
1. mounted closely adjacent to but not in contact
with said traveling web, and rotated at a su?icient
speed to discharge color from its surface by cen
trifugal action onto said traveling web. The
velocity of color discharge for coating the web
18 is such as to disperse the color into the form of a
?nely divided spray. The surface of the spray
roll is so characterized as to cause its discharged
color to spread uniformly over the traveling web
even when the web is traveling at high speed such
20 as may occur when the web is being coated di
rectly as it emerges from a paper making ma
chine.
v
A further feature of the invention is in getting
Fig. 3 is a transverse sectional view of the suc
tion box which supports the paper web during its
coating operation;
I
Fig. 4 is a fragmentary elevational view show
ing the general relation of the color, transfer and 5
spraying rolls;
_
I
Fig. 5 is a diagrammatic view showing my in
vention applied to the coating of paper as part
of the manufacturing process;
Fig. 6 is a diagrammatic view showing an ar 10
rangement for coating both sides of the paper;
Fig. 7 is a fragmentary view showing a modi?ed
form of surface grooving for the spray roll;
Fig. 8 is a diagrammatic side view of a modi?ed
arrangement in which a second auxiliary spray
roll is used; and
Fig. 9 is a fragmentary plan view of the spray
rolls of the arrangement shown in Fig. 8.
Referring to Figs. 1 and 2, reference character
I indicates the frame of the machine which sup
ports a color reservoir 2. The reservoir, if desired
may be provided with an agitating means 3 driven
by any suitable means not shown. A color roll 5
the color onto the high speed spray roll for its
25 subsequent centrifugal discharge therefrom onto
journaled in bearing 6 rotates in the color bath
40 means for taking up color from a reservoir and
feeding it to the second or transfer roll. This is
Positioned above roll 5 is a transfer roll I0
journaled in bearings l I. Transfer roll I0 is simi
larly circumferentially grooved as at 12 to corre
spond to roll 5, the dimensions of the grooves of
roll l0 being such that the ?anges M which sepa
in the reservoir, to pick up color therefrom. Roll
the web. To this end _I provide means for pro- ‘ 5 is provided throughout its length with circum
jecting the color onto the surface of said spray roll ferential grooves 9 which are preferably narrow
in the same general direction as the moving sur
and close together. These grooves are straight
face of said spray roll preferably by a second and concentric as distinguished from a spiral
30 roll which also discharges color from its surface groove. Twelve grooves to the inch with a depth
by centrifugal action. The rotation of the second of one-eighth of an inch gives satisfactory results
or transfer roll is not as fast as that of the spray but the number and dimensions may be varied
roll for it serves to give the color only such veloc
within reasonable limits. As it is desirable to
ity and direction of discharge as will easily trans
con?ne the width of the color band picked up by
35 fer said color to the high speed spray roll. In this roll 5 to substantially the width of the web to be
manner the velocity of the color is progressively coated, scrapers or doctors ‘I, provided with pro
accelerated up to the point of its ?nal coating Jections ?tting into the grooves 9 (see Fig. 4) are
discharge onto the web.
adjustably mounted on rods 8 adjacent the end
A still further feature of the invention is the portions of roll 5.
_
accomplished preferably by a color take-up roll
dipping into a reservoir of color and having its
surface adjacent to but not in contact with the
45 transfer roll. The adjacent surfaces of said rolls
rate the grooves may enter grooves 9 of roll 5
are specially constructed for an easily controlled
flow of color from one to the other as will be
without actually contacting the walls of the latter
later described.
The color is transferred by roll ID to a spray
roll l5 positioned to just clear roll l0 and jour
naled in bearings I 6. Roll I5 is provided on its
surface with a spiral groove l8. The groove l8
may correspond in dimensions to grooves I! of roll
l0 although the actual dimensions are not critical.
In the form illustrated in Figs. 2 and 4 the spiral
groove has a lead approximately equal to the 55
,
Other and further objects will be apparent from
50 the following speci?cation and‘claims.
In the accompanying drawings,
Fig. 1 is a side elevational view of a coating
machine embodying my invention;
Fig. 2 is a fragmentary end sectional view sub
5Q stantially on line 2-2 of Fig. 1;
grooves.
2,180,060
2
spacing of cgrooves I2. Obviously if the lead is in
changes in the speed of the web. The speed of
creased the form and dimensions of the grooves
must be changed to correspond or a plurality of
roll 5 is varied with the speed of web travel and
its speed controls the thickness of the coating
applied. Roll 5 may therefore conveniently be.
spiral grooves must be used.
Guards
I9 are
mounted at the sides of rolls I0 and I5 to con?ne
driven from, the same source of power as the‘ web ‘ 5
the spray of color during the coating operation as
later described. A partition wall I9’ extends in
wardly from one side of the guard. Ii:- up to a point
feeding means through cone pulleys or other
speed regulating devices. For a speed of web
travel of around 500 feet per minute the speed of
roll 5 should be of the order of 58 R. P. M. to give
a normal coating. For the speeds given, diame
ters of 51/2 inches for roll 5, 35 inches for roll I0,
and 10% inches for roll I5 give satisfactory re
suits.
In operation color is picked up in the grooves 9
of roll 5 from which it is taken by the flanges I4 15
close to spray roll I5 as shown in dotted lines in
10 Fig. 1, so as to con?ne the downward discharge
from spray roll I5. It will be appreciated that the
high speed rotation of spray roll I5 will also set
-up a considerable current of air in the direction
of its peripheral travel due to the surface friction
15 of said periphery with respect to the air through
which it travels, and that the partition wall I8’
positioned as shown acts as a bai’?e to prevent
this peripheral air current from unduly disturb.
ing the projection of the color from the transfer
20 roll III to said spray roll I5.
The web to be coated, such as a web of paper 20,
is led into close proximity to but not in contact
with the spray roll I5 and is supported in its pas
sage over roll I5 by a suction box 2|, adjustably
25 mounted by means of screws ‘I0 on the main
frame of the device. Screws ‘I0 may be con
veniently operated by hand wheels ‘II.
As best shown in Figs. 2 and 3 the bottom of
the main portion of box 2I is formed by members
30 22 extending inwardly from the sides to leave an
opening 23 extending the full length of the box
and of a width no greater than the minimum
width of the web to be coated. Positioned be
neath members 22 are a plurality of rolls 24 ro
35 tatably mounted in bearings 25 and adapted to be
rotated at web speed by pulley 25, or the like,
from a suitable source of power, not shown.
A
pair of rods 21 (see Fig. 1) extending transversely
of the machine, between and parallel to the mem
40 bers 22 and rolls 24, slidably support deckles 28.
The upper edges of deckles 28 slide on the under
surface of members 22 and the lower portion of
the deckles are provided with projections 29 (Fig.
1) extending downwardly between rolls 24 with
45 their side edges conforming to the curvature of
the rolls and with their lower edges in proximity
to the web traveling against rolls 24. As will be
obvious deckles 28 shut off the space at the ends
of rolls 24 making the suction between that por
of roll I0. Roll III rotates at a speed su?lcient to
discharge the color onto roll I5 by centrifugal
action. The color is discharged from roll III in
narrow bands due to the circumferential groov
ing of the roll I 0 but the spiral grooving of roll
I 5 spreads these bands transversely and the color
'is discharged by a centrifugal action from the
surface of roll I5 as a smooth even coating onto
the traveling web, which is held in proper posi
tion by the suction box as it passes over roll I5.
It will be understood that the drawings do not
attempt to show the width and depth of the
grooves, or the spacing of the rolls with respect
to each other and the web, to scale. In the pre
ferred practice rolls I0 and I5 just clear each
other and roll I5 just clears the web, but the
groove dimensions and roll and web spacing, as
well as roll diameters and speeds, may be varied
as conditions may require. Preferably the grooves
are very narrow and close together.
As shown only the. bearings II of roll III are '
made adjustable, but all the bearings may be
made similarly adjustable if desired.
In Fig. 7 a different form of surface grooving
for roll I5 is shown comprising a plurality of 40
oppositely directed spiral grooves 80 and UL
In Figs. 8 and 9 is shown diagrammatically a
modified arrangement in which an additional or
auxiliary spray roll 10 is mounted behind the main
spray roll I5. The purpose of roll ‘I0 is to catch
color which is sprayed to the rear of the principal
roll and in turn spray it on the web. The two
spray rolls I5 and ‘I0 run in the same direction,
that is the top surfaces of both run in’ the direc
tion of the rolls intermediate the deckles e?ective I tion of the travel of the web being coated. Roll
‘I0 is similar to roll I5 in that it just clears the
to hold the web against the rolls.
The deckles are adapted to be adjusted on web as shown. The addition of roll ~I0 assists
their supporting rods, to position them, as shown in giving a uniform color coating to the web.
in Figs. 2 and 3, adjacent the edges of the web 20, Roll ‘III is provided with grooves ‘II which grooves
are similar in form to grooves I8 of roll I5.‘ As
55 by means of shafts 30 journaled in brackets 3|
and threaded into the deckles at 32. Shafts 30 shown in Fig. 9, these grooves ‘II and I8 prefer
are provided with hand wheels 33 by which the ably run in the same direction and are substan
shafts 30 may be rotated to advance or retract tially of the same pitch.
One important advantage resulting from the
the deckles to desired position.
Suction is supplied to box 2I from a suitable high speeds at which webs can be coated by my
device is that paper webs may be coated directly
source, not shown, through conduit 34.
Referring to Fig. 1, the web 20 is drawn from
I a suitable supply roll 40 over a guide roll 4I, be
neath a guide roll 42, beneath suction box 2|,
just described, and around guide rolls 43 and 44
as they are delivered from a paper making ma
chine substantially as a part of the paper making
operation. In Fig. 5 I have shown diagrammati
to a drying means and wind-up mechanism not
shown. 'As will be clear from Figs. 1 and 2, the
web as it travels beneath suction box 2| is brought
cally one arrangement which such an installation 65
may take. In said figure 50 indicates the de
livery end of a paper making machine from
which the web of paper 5| is led around a con
into close proximity with the surface of roll I5.
ventional drying drum 52. - As the web passes
Rolls 5, III and I5 are driven in the direction around drum 52 one side is coated by a coating 70
70
of the arrows in Fig. 1 by any suitable means not unit A made according to my invention as above
shown. Roll I5 is preferably driven at a speed described, the rolls 5, I0 and I5 being diagram
of the order of 3800 R. P. M. and roll III at a speed matically shown by the circles so designated.
From drum 52 the web is reversed around guide
of the order of 1100 R. P. M. and the speeds 0
15 these rolls need not be changed for normal rails 53 and carried around a second drying drum
3
2,180,060
said roll, and a suction box having one sidev
formed of a plurality of closely spaced rolls over
which the web'passes in close proximity to the
55 where the other side of the web is coated by a
second coating unit B. From drying drum 55 the
web travels around guide rolls 56 to any further
desired ?nishing device, such as the stack calen
spirally grooved spraying roll.
6. A devicefor coating webs of paper and the
like which comprises a spraying roll having its
surface spirally grooved, means to supply color to
said roll, a suction box having one side formed of
a plurality of closely spaced rolls over which the
web passes in close proximity to the spirally
grooved spraying roll, the sides of said box having
der 58, and thence to a wind-up 59.
A different arrangement for coating both sides
of a web is shown diagrammatically in Fig. 6 in
which the web 60 is led around a guide roll 6|
between opposed coating units C and D which si
10 multaneously coat both sides of the web. The
web is then passed through a drying chamber 62
portions extending between the web engaging
rolls, and means to adjust said portions toward
in which, guided by rolls 63, it passes between
drying jets of warm air as indicated at 64. From
and from each other to vary the width of the suc
15
tion area effective between the rolls.
7. An apparatus for coating a traveling web
the drying chamber the web is passed around
15 guide rolls 65 to a wind-up 66.
It will be understood that the term “color" as
with color comprising a high speed spray roll
mounted closely adjacent to but not in contact
with said web, said spray roll having a spirally
grooved surface adapted to receive color and 20
being rotated at sufficient speed to discharge color
therefrom by centrifugal action onto said web in
the form of a ?nely divided spray, means for
used in this speci?cation ‘and the claims includes
any of the coating materials usually employed for
coating purposes, and that the method and‘ ap
20 paratus of this invention may be used for spray
ing material in the form of a ?ne powder or dust,
such as gold, aluminum or mica, in the same man
ner as liquid materials, the webs to which pow
dered material is applied being ?rst sized or
25 otherwise treated to cause adherence thereto of
the powdered material.
I claim:
delivering color to said'spray roll by projecting
the color against the rotating surface of said
-
,
1. A device for coating webs of paper and the
like which comprises a roll for taking up color
30 from a color supply, said take-up roll being
formed with circumferential grooves, a transfer
roll having circumferential ribs running in the
grooves of the take-up roll and receiving color
therefrom, a spirally grooved roll slightly spaced
35 from the transfer roll to receive color therefrom‘
by centrifugal action and means to present the
surface to be coated in close proximity to the spi
rally grooved roll to ‘receive color therefrom by
centrifugal action.
2. A device for coating webs of paper or the
40 like which comprises a roll for taking up color
from a color supply, ‘said take-up roll being
formed with narrow closely spaced circumferen
tial grooves, a transfer roll having circumferen
tial ribs running in the grooves of the take-up
roll and receiving color therefrom, a spraying roll
positioned in close proximity to the transfer roll
to receive color therefrom by centrifugal action,
said spraying roll having its surface spirally
grooved to spread the color axially along the
spraying roll and discharge it onto the surface
to be coated.
3. A device for coating webs of paper and the
like which comprises a spraying roll having its
surface spirally grooved, means to supply color to
said roll and means to direct the web to be coated
past said roll in close proximity to the surface
thereof.
4. A device for coating webs of paper or the
like which comprises a roll for taking up color
from a color supply,_ said take-up roll being
formed with narrow closely spaced circumferen
tial grooves, a transfer roll having circumferen
tial ribs running in the grooves of the take-up
roll and receiving color therefrom, a spraying roll
positioned in close proximity to the transfer roll
to receive color therefrom by centrifugal action,
said spraying roll having its surface spirally
grooved to spread the color axially along the
spraying roll and means comprising a suction box
70 to present the web to be coated in close proxim
ity to the spraying roll.
5. A device for coating webs of paper and the
75
like which comprises a spraying roll having its
surface spirally grooved, means to supply color to
spray roll.
,
8. An apparatus for coating a traveling web
with color comprising a high speed spray rollv
mounted closely adjacent to but not in contact
with said web, said spray roll being rotated at_
sufficient speed to dischargecolor therefrom by
centrifugal action onto said web in the form of a
finely divided spray, a second vroll mounted closely
adjacent to but not in contact with said‘ spray
roll and acting to deliver color by centrifugal ac
tion onto said spray roll, the rotation of said sec
ond roll being slower than said spray roll and
with the adjacent surfaces thereof moving in the
same general direction and means for supplying
color to the surface of said second roll.
40
9. An apparatus for coating a traveling web
with color comprising a high speed spray roll
mounted closely adjacent to but not in contact
with said web, said spray roll being rotated at,
su?icient speed to discharge color therefrom by 45
centrifugal action onto said web in the form of a
?nelydivided spray, a second roll mounted closely
adjacent to but not in contact with said. spray.
roll and acting to deliver color by centrifugal
action onto said spray roll, the rotation of said 50
second roll being slower than said spray roll and
with the adjacent surfaces thereof moving in the
same general direction, and a third roll for taking
up color from a reservoir and transferring said
color to said second named roll, the surface of 55
said take-up roll being closely adjacent to but not
in contact with said second roll. '
10. An apparatus for coating a traveling web
with color, comprising a high speed spray roll
mounted with its axis of rotation extended trans 60
versely to the direction of travel of said web and
having its peripheral surface in closely adjacent
tangential relation to but not in contact with
said web, means for rotating said spray roll at
sufficient speed to discharge color from‘ its pe
ripheral surface by centrifugal action onto said
web in the form of a ?nely divided spray, a color
supply for said spray roll comprising means ‘for
projecting color against one peripheral portion of
said rotating spray roll simultaneously with the 70
discharge of color to the web from another pe
ripheral portion of said spray roll.
'
’
11. An apparatus for coating a traveling web
with color, comprising a high speed spray roll
mounted with its axis of rotation extended trans 75
4
2,130,000
.
versely to the direction of travel of said web
and having its peripheral surface in closely ad
color which comprises the step of operating a
centrifugally acting discharge surface at a speed
jacent tangential relation to but not in contact
with said web, means for rotating said spray roll
sumcient to discharge color therefrom onto said
traveling web in the form of a ?nely divided
at sufficient speed to. discharge color from its
spray, and the step of supplying color to said
peripheral surface by centrifugal action onto said
centrifugally acting discharge surface by project
web inthe form of a finely divided spray, a color
supply for said spray roll comprising means for
ing the color thereto at a velocity less than the
discharging velocity of said surface, and in the
projecting color’ against one peripheral portion
10 of said rotating spray roll simultaneously with
the discharge of color to the web from another v
peripheral portion of said spray roll, said color
being‘ projected onto said spray roll at a velocity
less than the peripheral speed of said spray roll
15 and in the same general direction as the periph
eral'movement thereof.
‘
12. An apparatus for coating a traveling web
with color, comprising a high speed spray roll
mounted with its axis of rotation extended trans
20 versely to the direction of travel of said web and
having its peripheral surface in closely adjacent
tangential relation to but not in contact with
said web, means for rotating said spray roll at
su?icient speed to discharge color from its periph
25 eral surface by centrifugal action onto said web
in the form of a ?nely divided spray, a color
supply for said spray roll comprising means for
projecting color against one peripheral portion
same direction of travel as said discharging sur
a
10
14. The method of coating a traveling web with
color which comprises the step of operating a
centrifugally acting discharge surface at a speed
sufficient to discharge color therefrom onto said
traveling web in the form of a ?nely divided 15
spray, and the step of supplying color to said
face.
centrifugally acting discharge surface by pro
jecting the color thereto from a second centrifu
gally acting discharge surface having a velocity
of discharge less than the velocity of discharge 20
of said ?rst named surface.
15. The method of coating a traveling web
with color which comprises the step of operating
a centrifugally acting discharge surface at a
speed su?lcient to discharge color therefrom onto 25
said traveling web in the form of a ?nely divided
spray, the step of supplying color to said cen
trifugally acting discharge surface by project
of said rotating spray roll simultaneously with ing the color thereto from a second centrifugally
acting discharge surface having a velocity of dis 30
30 the discharge of color to the‘ web from another
peripheral portion of said spray roll and. a battle charge less than the velocity of discharge of said
partition extending toward and away from the‘ ?rst named surface, and the step‘of feeding a
peripheral surface of said spray roll and posi
supply of color into continuous contact with the
tioned adjacent that portion of said peripheral ~> surface of said second named centrifugally act
surface upon which the color is received from ing discharge surface.
86
said projecting means.
‘
13. The method of coating a traveling web with
RUSSELL S. BRACEWELL.
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