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Патент USA US2129349

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Sept. 6, 1938.
J, B, EBEN
2,129549
METHOD OF’ MAKING CENTER SPOT CROWNS
Filed July 14, 1956
' 15
£592.
1
QM M 45%
0;;
INVENTOR
$MW
A; ATTORNEY,
,
2,129,349
‘Patented Sept. 6, 1938
UNITED STATES PATENT OFFICE
,
2,129,349
METHOD OF MAKING CENTER ‘SPOT
CROWNS
.‘Iay Bernard Eisen, Yonkers, N. Y., assignor to
Ferdinand Gutmann & 00., Brooklyn, N. Y., a
corporation of Newv York
Application July 14, 1936, Serial ‘No. zcones
14 Claims.
(Cl. 113-80)
The invention relates to a method of making
center spot crowns, and more particularly to a
ing 170° to 180° F., greatdii?culty was experi
procedure by which the center spot discs may be
?nished paper spot was to ‘be applied to‘ the
enced in conditioning these adhesives when a‘
secure an initial bond between the center'spot
disc and the cushion disc immediately upon the
cushion-disc. This is due to the difficulty of trans
mitting heat through paper to the adhesive with ‘.5
'sui’iicent rapidity to permit the operation of the
spotting machine at normal speeds.
,
I have found by experiment, that the use of
heat for conditioning the adhesive between the
center spot disc ‘andthe cushion disc is unneces
sary, and have devised the ‘herein described meth
od by means of which the heating of any Part of
the spotting machine is unnecessary, and yet
avoid side slipping of a center spot disc .upon its
initial application to a- cushion disc togan extent 16
to limit the number of imperfect vcaps due to a
displacement of the center spot disc or its ‘posi
tioning oif center to an extent to interfere with
application of the center spot to said disc, in
'20 order to avoid displacement of said spot between
the proper sealing ofa bottle.
By applying center spot discs to the cushion 20
?rmly adhered to the cushion disc of a crown
‘ ii without applying heat to the adhesive during the
bonding of the center spot disc to the cushion disc.
Prior to the present inventionpthe practice for
many years in the production of center spot
crowns has been to cut the center spot discs from
10 a‘strip of facing material having associated there
‘ with or applied thereto, a heat fusible adhesive
it in a dry state, and applying heat to the center
spot material and therethrough to- the adhesive
‘ simultaneously with the depositing of the center
l5 spot disc upon the cushion disc of a crown. This
‘
practice was followed because it was necessary to
‘the time that it was deposited upon the cushion
‘disc and the time that the completely assembled
structure‘ was delivered to the ?nishing head or
pressure drum. In some instances; further heat
“25‘ was applied to the assembly in order to secure a
‘stronger bond between the center spot and the
cushion discs. In some instances, a heated cut~
, ting die was used, and the heat for fusing the‘ad
‘ihesive was transmitted from the heated cutting
30 die through thematerial o! the center spot disc
‘ to the adhesive. In other instances, the practice
was to heat the cushion‘ disc of the crown prior
to the depositing of a cold disc thereon by means
‘ of a cold cutting and plunger die.
When the center spots were of a metal foil, such
as aluminum or tin, heat was rapidly conducted to
the adhesive so as to permit the operation of the
spotting machine at the high speeds necessary
to make the method commercial. When pre
40‘ heating the cushion discs when a cold plunger
, die was used in cutting the center spot discs from
a strip, ,it has been found necessary to subject
‘ the caps, with the center spot thereon, to an ele
vated temperature between the application of the
45 center spot discs to the cushion disc and the de
livery of the completely assembled crown to the
?nishing drum’.
,
‘
With the use of adhesives having a low melting
point, such as gutta-percha and some resinous
adhesives, no difficulty was experienced in prop
erly‘ conditioning the adhesive by the transmis
sion of heat thereto through the center spot ma
terial, whether the material of this spot were a
metal foil or a ?nished paper. With adhesives
.55 having a higher melting point, or one approach
discs of crowns without the use of ‘heat, the
adhesive takes a ?nal set more rapidly than when
heat fusible adhesives are ‘used, and the bond
between the center spot disc and the cushion
disc is stronger and ?rmer when the crowns leave '25
the ?nal pressure stage ‘than when a setting
of the adhesive ‘is dependent upon its cooling
after leaving the pressure stage.
-
A cold method also has the advantage that it
reduces likelihood of mutilation of the decoration 30
upon the metal shell which, in machine handling,
is apt to be scraped when the crown is at a fairly
highgtemperature during its passage through the
spotting machine.
,In the practice of the method of “the invention, 35
I use a strip of facing material having ,upon one
side thereof a thin coating of a vdry adhesive.
Immediately prior to ‘the cutting of each disc from
this strip, ‘I apply to the adhesive coating a pene
trating volatile ‘solvent in su?icient volume to 40
make the adhesive su?iciently tacky .to ensure
a light bonding of the center spot disc to the
cushion disc by the pressure "applied thereto by
the plunger die. This bond is su?iciently strong
to permit the withdrawal of the plunger die after 45
deposit of the center spot .disc upon the cushion
disc without likelihood of displacement of the
disc. The adhesive, when the center spot disc is
applied to the cushion disc._ is sufficiently tacky
to avoid any side slipping of a center spot disc .50
as it is pressed ,upon ‘the cushion ‘disc by the
plunger, although the solvent will not have been
absorbed suf?ciently to condition the ‘adhesive for
the making of the ‘permanent or ?nal bond be;
tween the discs. This is due to the fact that the 55
2
2,129,349
time ‘interval between the application of the sol
vent to the adhesive and the deposit of the center
spot disc upon the cushion disc is not sufficiently
great to permit a complete absorption of the sol
vent by the adhesive.
The essential characteristic of the invention
is the complete elimination of all heat or heated
."
By the ?rst procedure above referred to, the
shell I0 is brought below an ordinary dropper l3
for depositing an adhesive, such as a solution or
material suitable for use as a center spot in
crown caps.
tacky adhesive by means of a feeding plunger [5,
of a varnished kraft or express paper or other
The invention consists primarily in a method
of making center spot crowns embodying therein
the feeding of a strip of facing material having
a coating of an adhesive soluble by an organic
solvent, upon the under face thereof in relation
20 to cold cutting dies including a plunger die, ap
plying a liquid organic solvent to the coating
upon said strip prior to the delivery of the strip
in relation to said dies, whereby said adhesive is
made tacky, cutting a disc from said strip and
25 depositing it upon a cushion disc in a metal shell
while at normal factory temperatures, applying
pressure to said center spot disc when depositing
it upon said cushion disc, and thereafter apply
ing a continuing pressure to said center spot disc
30 by a pressure ‘plunger maintained at normal
as in the crown assembling machine. After the 15
cushion disc H has been deposited in the metal
shell upon the tacky adhesive, it is brought by
the functioning of the machine below a die mech
anism consisting of a female die l6 and a plung
er die I‘! of the usual construction. These dies 20
are cold in the sense that they are at the ordi
nary factory temperatures.
The crowns in rapid succession are brought
below the die l6 and each crown has a momen
tary dwell while in this position. During the 25
dwell of the crown, or while it is stationary be
low the die IS, a center spot disc is cut from a
strip I8 of facing material, the under side of
which has a coating [9 of a‘ soluble adhesive
which, while the strip is in the roll 20, is dry 30
factory temperatures, whereby said center spot
There is a wide choice of soluble adhesives with
disc is applied to said cushion disc without sub—
jecting the adhesive to an elevated temperature;
and in such other novel steps and practices as
which the strip of facing material may be coated,
but preferably I employ a cellulose derivative ad
hesive containing a synthetic resin, this being
particularly pointed out in the claims hereto
35
readily obtainable as an open market product.
After passing from the roll 20, the strip I8 is
appended.
Referring to the drawing,
intermittently fed toward the die mechanism [6
and I1, during which movement the coated sur
35 are hereinafter. set forth and described, and more
Fig. 1 is a view partly in section showing the
40 depositing in a metal shell of an adhesive for
securing a cushion disc within said shell;
Fig. 2 is a similar view showing the application
of heat to the adhesive to evaporate the ve
hicle thereof;
Fig, 3 shows the depositing of a cushion disc
upon the tacky adhesive in the shell;
_
Fig. 4 is a, view illustrating the manner of ap
plying a solvent to a strip of material having
the under surface thereof coated with a soluble
50 adhesive, and the cutting of center spot discs
therefrom and their deposit upon the cushion
disc; and
Fig. 5 shows the ?nal pressure stage during
which the ?nal bond between the center spot
55 disc and the cushion disc is made.
face 19 engages a roller 2| in a tank containing
a volatile solvent 22 for the material of the coat 40
ing IS. The solvent, which I prefer to use is
ethyl acetate or ethyl acetate mixed with toluene.
After leaving the roller 2|, the coating I9 is sub
‘ jected to the vapors from a bath 23 of the same
solvent which is used in the bath 22.
A screen 46
24 is used to prevent the sagging of the strip
inwardly of the tank containing the bath 23,
thus avoiding direct contact of the coating at
this point with the liquid solvent. A hood 25 is
positioned above the bath to con?ne the solvent
in a manner to prevent its escape into the air.
The vapor from the bath 23 not only prevents
the evaporation of the solvent applied to the
coating l9 by the roller 2| which is not imme
diately absorbed by said coating, but also serves
Like numerals refer to like parts throughout
to diffuse such solvent in a manner to ensure a
the several views.
In the practice of the method of my invention,
substantially uniform
distribution thereof
throughout the entire area of the coating l9
upon the strip 18. The baths 22 and 23 are
closely adjacent the die mechanism, so that when
the strip reaches the die mechanism, the ad
, two procedures may be followed.
60
at l2.
emulsion of casein, in the shell. As shown in
Fig. 2, the adhesive is then subjected to an ele
vated temperature from a heater shown conven
tionally at I4, to remove the vehicle of the casein
adhesive and make the adhesive tacky. In the
next step, a cork disc II is deposited upon the
parts in applying the center spot disc to the
cushion disc, so that the method is equally ap
10 plicable to the production of center spot crowns
whether the facing material be of a metal foil or
45
In the drawing, the ordinary metal shell of a
crown cap having a ?uted skirt is shown at III,
the cushion disc therein at l I and the center spot
In the ?rst of these, the cushion disc is ap
plied to the metal shell and the center spot is
applied to the cushion disc in a continuing oper
ation in the same machine. By the other pro
cedure, the cushion disc may be assembled in
65 the metal shell in one machine and the center
spot may be applied to the cushion disc of the
assembled crown in another machine.
hesive thereon is tacky but not suf?ciently soft
to cause fouling of the dies.
The intermittent advancement of the strip ma
terial and its travel toward the dies l6 and I] 65
after the application of the solvent to the coat
ing l9, affords a time interval during which the I
By the ?rst method, the steps shown in the ‘ solvent may act to make the coating 19 sufficient
ly tacky so that when it is pressed by the plung
er die I"! against the cushion disc II, it will 70
adhere thereto with sufficient strength to ensure
its remaining in the position centrally of the
cushion “disc without the application of pressure
several views of the drawing are followed in rap
70 id succession by a continuing operation of one
machine. By the second method, Figs. 1, 2 and 3
illustrate the assembly of the crown cap without
the center spot in one machine, and Figs. 4 and 5
illustrate the application of the center spot in an
othcv'risc completed crown.
until the crown reaches the pressure drum, where
it is subjected to a continuing pressure for a time
.'
oneness
,
tory
stick
or
adhesion
oi’
the center spot disc to
i 1 sunlcient to secure the desired strong bond be
tween the center spot I! end the cushion disc H.
‘A disc is out from the strip It by the descent
10: the plunger l1 through the die member l8.
. and said plunger carries the strip into contact
with, and depositeit upon, the cushion disc il
l of the ‘crown, developing a slight momentary
‘ pressure‘ whichhwith the slightly tacky, adhesive,
"will cause a temporary bonding of the center
the cushion ‘disc.
‘
In the accompanying drawing, the various
mechanisms“ are shown ‘merely conventionally.
and it is obvious that other means of applying
the adhesives to the coating ll of the strip I!
may be employed, if desired,
1 ‘
Having described the invention, what I claim
as new and desire to have protected by Letters
spot to the‘ cushion disc without possibility of ~Patent, is:
side slipping of the disc to an extent to position
it‘off center.
‘
I
,
‘ Following upward movement of the plunger die
Ill, the center spot ‘disc it! will be adhered to the
‘
15 cushion disc Ii with sufficient tenacity to avoid
displacement of this disc while it is being con
‘veyed from adjacent the (die mechanism to the
‘point where it is delivered to the collecting drum,
‘shown conventionally at 26.
of the strip in relation to saiddies, whereby said
adhesive is‘made tacky, cutting ardisc from said
entire area of the center spot by a spring pressed
metal shell while at normal factory temperatures,
applying pressure to said center spot disc when
depositing it upon said cushion disc, and there
after applying a continuing ‘ pressure to said
, ~ After delivery of the crown to this drum, a
‘20, continuing
pressure is applied throughout the
‘ ‘ ‘plunger 21, which pressure is maintained until
‘ ,jthecrown is discharged from the drum. This
25 ordinarily is.an interval of from eight to ten
, seconds.
7
The spring/pressed presser plunger 21 is main
tained i at normal‘ factory temperatures, the
“ , method being such as to not require the applica
30 tion of ‘heat ‘to the assembly for the purpose of
‘securing an adequate bond betweenthe cushion
disc II and the metal shell ‘l0, and between the
‘4 ‘center spot disc i2 andthe cushion disc I L. The
,"ss,
v1. A method of making center spot crowns em
bodying therein the feeding of a strip of facing
material having a‘ coating of an‘adhesive soluble
by an organic solvent, upon the under face there
of in relation to cold cutting dies including a. 15
plunger die, applying a liquid organic solvent to
the coating upon said strip prior to the delivery
strip and depositing it upon a cushion disc in a
center spot disc by a presser plunger maintained 25
at normal factory temperatures, whereby said
center spot disc is‘ applied to said cushion disc
without subjecting the adhesive, to an elevated
temperature.
‘
,
‘
2. A method of making center spot crowns 30
‘embodying therein the feeding of ‘ a strip of
facing material having a coating of an adhesive
soluble by‘an organic solvent, upon the under
face thereof in relation to cold cutting dies in
cluding a plunger die, applying a volatile liquid 35
organic solvent to the coating upon said strip
‘evaporation of the volatile solvent applied to the , prior to the delivery of the strip in relation to
‘time interval during which the assembled cap is
subjected to pressure from said‘ plunger 21 is such
as to permit the setting of the adhesive by the
said dies, whereby said adhesive is made tacky,
cutting a disc from said strip and depositing it
upon a cushion disc in‘a metal shell while at
40 ‘ ‘When it is desired to follow the second pro- ‘. normal factory temperatures, applying pressure 40,
1 cedure herein referred to, the ?rst three steps
to said center spot disc when depositing it upon
. 1,- shown in Figs. ,1 and 3 are practiced in one ma
said cushion disc, and thereafter applying a
‘ ‘ chine, and the completely assembled cap, except
1‘ for the presence, of the center spot disc, is fed continuing pressure to said center spot disc by
to a second machine in which the steps shown in a presser plunger maintained‘at normal factory 45
temperatures, whereby said center spot disc is
Figs. 4 and 5- are practiced.
adhesive coating it! upon the strip I8 of facing
‘materiaL-J
,;,In those’ instances where the machine used
permits the. ?rst procedure herein, referred ‘to,
,this procedure is preferable, but if it be-attempted
50 to practice the method following this procedure
winqordinary crown assembling machines, the
‘ length of these machines may not be adequate
to‘ permit such practice without modifying the
a machine structure, in which event it is preferable
to divide the method into two stages as heretofore
referred to._
>
-
,
_ ‘Since no heat is required in the method of the
i ‘ invention, it is particularly adapted for the pro
, X duction of center spot crowns using a ?nished
co, paper as theifacing material, although it may
‘ ‘i be advantageously used with metal foils.
By the term “soluble adhesive’, as herein used,
, is meant, an ‘adhesive soluble by an organic sol
vent, and by the term “volatile solvent” is meant
65 a liquid organic solvent which will‘vaporize with
-
‘ sufficient rapidity at ordinary temperatures to
' a permit the adhesiveto set rapidly as a result of
;‘the elimination of the solvent without the appli
‘ cation of heat.
It is not my intention to limit the invention
to ‘the particular adhesive‘ herein referred to,
I since there is a wide selection of adhesives which
react rapidly to a volatile solvent applied thereto,
but I have found thatthe cellulose derivative ad
hesive herein referred to gives a highly satisfac
applied to said cushion disc without subjecting '
the adhesive to an elevated temperature. ‘
3. A method of making center spot crowns em
bodying therein the feeding of a strip. of facing 50
material having a coating of a soluble cellulose
derivative adhesive containing a synthetic resin
upon the under face thereof in relation to cold
cutting dies including a plunger die, applying a
liquid organic solvent to the coating upon said 55
strip prior to the delivery of the stripin relation ’
to said dies, whereby said adhesive is made tacky,
cutting a disc from said strip and ‘depositing it
upon a cushion disc in a metal shell while at
normal factory temperatures, applying pressure
to said center spot disc when depositing it upon
said ‘cushion disc, and thereafter applying a
60
continuing pressure to said center spot disc by a
presser plunger maintained at normal factory
temperatures, whereby said center ‘spot disc is 65
applied to said cushion disc without subjecting
the adhesive to an elevated temperature.
4. A method of making center spot crowns em
bodying therein the feeding of a strip of facing,
material having a coating 'of a soluble cellulose
derivative adhesive containing a synthetic resin
upon the under face thereof in relation to cold
cutting dies including a plunger die, applying a
volatile liquid organic solvent to the coating upon
said strip prior to the delivery of the strip in rela
2,129,349
tion to said dies, whereby said adhesive is made
tacky, cutting a disc from said strip and deposit
ing it upon a cushion disc .ina metal shell while
at normal factory temperatures, applying pres
sure to said center spot disc when depositing it
upon said cushion disc, and thereafter applying a
continuing pressure to saidcenter spot disc by a
presser plunger maintained at normal factory
temperatures, whereby said center spot disc is
10 applied to said cushion disc without subjecting
the adhesive to an elevated temperature. ,
5. A method of making center spot‘ crowns em
bodying therein the feeding of a strip of facing
material having a coating of a soluble cellulose
15 derivative adhesive‘containirig a synthetic resin
upon the under face thereof in relation to cold
cutting dies. includinga plunger die, applying
ethyl acetate to the coating upon said strip prior
to the delivery of the strip in relation to said dies,
20 whereby said adhesive is made tacky, cutting a
disc from said strip and depositing it upon a
cushion disc in a metal shell while at normal fac
tory temperatures, ‘applying pressure to said
.center spot disc when depositing it upon said
25 cushion disc, and thereafter applying a continu
ing pressure to said center spotdisc by a presser
plunger maintained at normal factory tempera
' tures, whereby said center spot disc is applied to
said cushion disc without ‘subjecting the adhesive
30 to an elevated temperature.
6. A method of making center spot crowns em
cutting dies including a plunger die, applying a
liquid organic solvent to the coating upon said
strip and subjecting said coating with the liquid
solvent thereon to the vapors of said solvent prior
to the delivery of the strip in relation to said dies,
whereby said adhesive is made tacky, cutting a ‘
disc from said strip and depositing it upon a
cushion disc in a metal shell while at normal fac
tory temperatures, applying‘ pressure to said
center spot disc when depositing it upon said 10
cushion disc, and thereafter applying a continuing
pressure to said center spot disc by'a presser
plunger maintained at normal factory tempera
tures, whereby said center spot disc is applied to
said cushion disc without subjecting the adhesive 15
to an elevated temperature.
9. A method of making center spot crowns em
bodying therein the feeding of a strip of facing
material having a coating of a soluble cellulose
derivative adhesive containing a synthetic resin 20
upon the under face thereof in relation to cold
cutting dies including a plunger die, applying
ethyl acetate to the coating upon said strip and
subjecting said coating with the ethyl acetate
thereon to the vapors of ethyl acetate prior to the 25
delivery of the strip in relation to said dies, where
by said adhesive is made tacky, cutting a disc
from said strip and depositing it upon a cushion
disc in a metal shell while at normal factory tem
peratures, applying pressure to said center spot 30
disc when depositing it upon said cushion disc,
bodying therein the feeding of a strip of facing
and thereafter applying a continuing pressure to
material having a coating of a soluble cellulose
derivative adhesive containing a synthetic resin
said center spot‘ disc by a presser plunger main
tained at normal factory temperatures, whereby
35 upon the under face thereof in relation to cold
said center spot disc is ‘applied to said cushion
disc without subjecting the adhesive to an ele
cutting dies including a plunger die, applying an
admixture of ethyl acetate and toluene to the
coating upon said strip prior to the delivery of the
strip in relation to said dies, whereby said ad
hesive is made tacky, cutting a disc from said
‘strip and depositing it upon ‘a cushion disc in a
.metal shell while at normal factory temperatures,
applyingpressure to said center spot disc when
vated temperature.
10. A method of making center spot crowns em
bodying therein the feeding of a strip‘of facing
material having a coating of a soluble cellulose 40
derivative adhesive containing a synthetic resin
upon the under face thereof in relation to cold
cutting dies including a plunger die, applying an
admixture of ethyl acetate and toluene to the
after’ applying a continuing pressure to said center coating upon said strip and subjecting said coat 45
spot disc by a presser plunger maintained at nor
ing with the solvent admixture thereon to the
mal factory temperatures, whereby ‘said center vapors of ethyl acetate and toluene prior to the
spot disc is applied to said cushion disc without _ delivery of the strip in relation to said dies, where
subjecting the adhesive to an elevated tempera
by said adhesive is made tacky, cutting a disc from
said strip and depositing it upon a cushion disc 50
ture.
,
in a metal shell while at normal factory tempera
p 'I. A method of making center spot crowns em
bodying therein'the feeding of a strip of facing tures, applyingv pressure to said center spot disc
material having a coating of an adhesive soluble when depositing it upon said cushion disc, and
by an organic solvent, upon the under face thereof thereafter applying a continuing pressure to said
in relation to cold cutting dies including a plunger center spot disc by a presser plunger maintained 55
at normal factory temperatures, whereby said
die, applying a liquid organic solvent to the coat
ing upon} said strip and subjecting said coating center spot disc is applied to said cushion disc
with the'liquid solvent, thereon to the vapors of without subjecting the adhesive to an elevated
depositing it upon said cushion disc, and there
said's'olvent ‘prior to the delivery of the strip in
60 relation‘ to said dies, whereby said adhesive is
made tacky, cutting a disc from said, strip and
depositing it upon a cushion disc in a metal shell
while at‘ normal factory temperatures, applying
pressure to said center spot disc when depositing
65 it upon said cushion disc, and thereafter applying
a continuing pressure to said center spot disc by a
presser plunger maintained at normal factory
temperatures, whereby said center spot disc is ap
plied to said cushion disc without subjecting the
70 adhesive to an elevated temperature.
8. A method of making center spot crowns em~
' bodying therein the feeding of a strip of facing
material having a coating of a soluble.cellulose
derivative adhesive containing a synthetic resin
75 upon the under face thereof in relation to‘ cold
temperature.
11. A method of making center spot crowns 60
embodying therein depositing an adhesive in the
shell of a crown cap, subjecting said adhesive
to an elevated temperature to make it tacky,
depositing a cushion disc within said shell upon
said tacky adhesive, bringing the crown by a
continuing operation below cold cutting dies in
cluding a plunger die, feeding a strip of facing
material having a coating of an adhesive soluble
by an organic solvent, upon the under face
thereof in relation to said dies, applying a liquid 70
organic solvent to the coating upon said strip
prior to the delivery of the strip in relation to
said dies, whereby said adhesive is made tacky,
cutting a disc from said strip and depositing it
upon a cushion discin a metal shell while at 75
‘
9,199,349
5
‘normal factory temperatures, applying pressure
derivative adhesive containing a synthetic resin
upon the under face thereof in relation to said
said cushion disc, and thereafter applying a con- ‘ dies, applying ethyl acetate to the coating upon
tinuing pressure to said center spot disc by a said strip prior to the delivery of the strip in re
presser plunger maintained at normal factory lation to said dies, whereby said adhesive is made
temperatures, whereby said center spot disc is tacky. cutting a disc from said strip and deposit
applied to said cushion disc without subjecting , ing it upon a cushion disc in a metal shell while
the adhesive to an elevated temperature.
at normal factory temperatures, applying pres
to said center spot disc when depositing it upon
12. A method of making center spot crowns
10 embodying therein depositing an adhesive in the
shell of a crown cap, subjecting said adhesive
to ‘an'elevated temperature to make it tacky, de
sure to said center spot disc when depositing it
upon said cushion disc, and thereafter applying 10'
a continuing pressure to said center spot disc
by a presser plunger maintained at normal fac
positing a cushion disc within said shell upon tory temperatures, whereby said center spot disc
said tacky adhesive. bringing the crown by a ‘is applied to said cushion disc without subjecting
15 continuing operation below cold cutting dies in ‘ the adhesive to an elevated temperature.
cluding a plunger die, feeding a strip of facing
14. A' method of making center spot crowns
material having a coating of a soluble cellulose , embodying therein depositing an adhesive in the
derivative adhesive containing a synthetic resin shell of a crown cap, subjecting said adhesive
upon the under face thereof in relation to said to an elevated temperature to make it tacky, de
dies, applying a liquid organic solvent to the positing a cushion disc within said shell upon
coating upon said‘ strip prior to the delivery of said tacky adhesive, bringing the crown by a
the strip in relation to said dies, whereby, said 1 continuing operation below cold cutting dies in
adhesive is made tacky, cutting a disc from said cluding a plunger die, feeding a strip of facing
strip and depositing it upon a cushion disc in a
material having 'a coating of a soluble cellulose
metal shell while at normal factory tempera
tures, applying pressure to said center spot disc
derivative adhesive ‘ containing a synthetic resin 25
‘when depositing it upon said cushion disc, and
thereafter applying a continuous pressure to said
center spot disc by a presser plunger maintained
30 at normal factory temperatures, whereby said
center spot disc is applied to said cushion disc
without subjecting the adhesive to an elevated
temperature.
13. A method of making’ center spot crowns
embodying therein depositing an adhesive in the
shell of a crown cap, ‘subjecting said adhesive to
an elevated temperature to make it tacky, de
.upon the under face thereof in relation to said
dies, applying an admixture of ethyl acetate and
toluene to the coating upon said strip prior to the
delivery of the strip in relation to said dies,
whereby said adhesive is made tacky, cutting a
disc from said strip and depositing it upon a
cushion disc in a metal shell while at normalfac
tory temperatures, applying pressure to said cen
ter spot disc when depositing it upon said cush
ion disc, and thereafter applying a continuing 35
pressure to said center spot disc by a presser
plunger maintained at normal factory temper~
positing a cushion disc within said shell upon said ‘ atures, whereby said‘center spot disc is applied
to said cushion disc without subjecting the ad—
tacky adhesive, bringing the crown by a contin
hesive to an elevated temperature.
uing operation below cold cutting dies includ
40
ing a plunger die, feeding a strip of facing ma
JAY BERNARD EISEN.
terial having a coating of a soluble cellulose
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