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Патент USA US2117180

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May 10, 1938. >
Filed' Oct. 14, 1935
Patented May. 10, 1938
Alfred L. Kronquest, Syracuse, N. Y., assignorto
Continental Can Company, Inc., New York,
N. Y., a corporation of New York
Application October 14, 1935, Serial No. 44,970
3 Claims. (Cl. 220-64)
‘The invention relates to new and useful im
provements in sheet metal containers, and more
particularly to a container which is adapted ‘for
the packaging of beverages.
An object of the invention is to provide a sheet
metal container which is so constructed that it
may be sealed by the clinching of a cap thereto,
and wherein the entire inner surface of the con
tainer is covered by a plastic non-metallic coat
ing applied to the container after it is completed
and ‘ready for ?lling, which plastic material is
lip 8 is bent back upon itself as indicated at
8a so that the raw edgev of the metal is well back
from the edge of the opening. The container is
closed by att ching to this top end a cap I l which
is clinched“ “'“neath the shoulder as shown in 5
Fig. 3 of the drawing. This cap is provided with
‘a sealing disk l2 which may be of any suitable
material such as cork. In Fig. 4 of the draw
ing, the metal at the mouth of the nozzle is
shown as turned outward and back upon the 10 '
outer face of the lip as indicated at 8b. This is
of such a character that it remains ductile at another way of strengthening the edge of the
refrigerating temperatures and does not break or . metal and placing the raw edge so that it will
?ake upon bending or ?exing of the walls of the
16 container.
A further object of the invention is to pro
vide a container of the above type wherein the
plastic material covering the inner surface there
'of is of such a character that it remains solid
80 and una?ected when submitted to a tempera
ture such as used in the pasteurizing of certain
In the drawing-
Figure 1 is a view showing a portion of a con
tainer made from sheet metal which is to be
coated for use in the packaging of beverages;
Fig. 2 is a similar view showing the coating
applied to the entire inner surface of the con
Fig. 3 is a vertical sectional view through a
container embodying the improvements after the
container is ?lled with the beverage and sealed,
Fig. 4 is a detail in section showing a slightly
modi?ed form of construction.
be embedded in the sealing gasket.
In the packaging of certain beverages in con- 15
tainers made of metal it is desirable and some
times necessary to cover the metal forming the
inner surface of the container with a. coating so
as to prevent the beverage from contacting with
the metal. It is well known, for example, that
beer if it contacts with the metal will cloud. 20
Efforts have been made to coat the metal sheets
in the flat prior to the construction of the con
tainer with an enamel which does not a?ect the
?avor or ‘color of the beverage. Such enamels
are sometimes scratched and fractured during
handling and are caused to blister in the region
of the side seam during the heat of solder bond
ing. Eiforts have been made to heal the frac
tures and cover the‘side seam by applying to 30
the container body'after it is completed, a coat
ing of enamel in a volatile solvent vehicle, but
this has not been altogether satisfactory and re
quires a baking of each individual container for
a long period of time to harden the enamel.
The invention is directed to a sheet metal con
According to applicant's invention, the con-'v
tainer which is especially adapted‘for the pack- ' tainer may be made from sheet metal such as
aging of beverages. In the present illustrated tin plate, and after the container is fabricated
embodiment of the invention, the container in~ and ready for ?lling, then the container is pro“
cludes a body portion made from a sheet metal vided on the interior thereof with a thermo- 40
blank which is bent into cylindrical form. The plastic, non-metallic coating. A material suit-_
edges of the blank are united by a solder bonded able for lining such a" container for beverages
lock and lap seam 2 of a novel construction not must have certain characteristics. It should be
described herein“ A bottom end 3 is secured t0 a thermoplastic material which can be heated
the body portion by a double seam 4. A top end and ?owed over the surface of the metal parts 45
5 is secured to the body portion by a double seam for the coating of the same. It should be a ma
t. This top end 5 is shaped so as to project up
terial which, when reduced to refrigerating tem
wardly from the double seam 6 as indicated at peratures will still be ductile and will not break or
‘l. The upwardly projecting portion is provided ?ake upon bending or ?exing the walls of the
with an opening centrally of the top end which container. Then again, it is often‘desirable to 50
is used for the ?lling of the container and for pasteurize certain beverages, as for example, in
the dispensing of the contents of the container the packaging of .beer it is placed in the recep
when it is opened. The metal surrounding the tacle and the receptacle closed, after which the
opening in the top end is shaped so as to provide receptacle is heated to a'temperature from 140°
’ a sealing lip B and a locking shoulder 9. The F. to 155° F.,_ according to the‘character of the 55
' beer and the desired pasteurizing effect to be
obtained. Thematerial used should, therefore,
be of a character that will remain solid when
heated to a temperature of 160° F. or there
Applicant, has found that certain petroleum
Waxes derived from the very high boiling of non
volatile fractions of petroleum oil, have all of the
characteristics named.
These waxes are com
monly separated in the de-waxing'of residual lu
bricating oils, such as cylinder stocks, and ac
cording to their method [of production and re
?ning, they are either amorphous or microcrys
These waxes are commonly known as
15 petrolatum waxes.
One of these waxes is known
to the trade as “Cerese Wax”. This wax, be
cause of its microcrystalline character, is duc
tile. When formed into thin sheets, it may be
subjected to repeated ‘pending stresses without
20 fracture.- When applied to metal sheets and al
lower to solidify, it adheres tenaciously thereto
even at temperatures below its melting point, and
when such wax coated sheets of metal are
chilled,‘ to temperatures in the neighborhood of
40° F., that is, refrigerating temperatures, the
wax does not chip off or ?ake when the metal is
bent so as to permanently indent the same.
Then again, this “Cerese Wax” does not melt un
der 160° R, which is well above the tempera
30 tures used in pasteurizing beer. a
The wax is reduced to a molten condition by
applying heat thereto.
It is preferably heated
to a temperature of 250° F. or more and the
liquid wax is then caused to- ?ow over every part
of the interior surface of the container. . The
container is then inverted for draining the wax
therefrom. As the wax flows from the mouth
of the container it will contact with the edge
thereof and ?ow by capillary attraction some
40 distance on to the outer surface of the lip.
ing heat to the contents so as to bring the beer
to the proper pasteurizing temperature. This
varies with the character of the beer from 140°
F. to 155° F. This heating of the container does
not, in any way, affect the wax lining, as the 5
wax, as above noted, has a melting point well
above that used in the pasteurizing of the beer. ’
In the pasteurizing of the beer, a pressure is
developed on the container of F approximately
ninety pounds per square inch. This pressure 10
on the lining in the region of the seams does not
cause the beer to break through the coating, as
the liquid wax penetrates into the crevices be
tween the metal parts ?lling the same so that
the internal pressure developing on the con 15
tainer merely forces the wax coating more ?rm
ly into the crevices and prevents the beverage
from in any way, reaching the metal parts or
the solder bond joining the same.
During the handling of the beer container and 20
the storing of the same in refrigerators, they
are often knocked and the thin walls indented.
The coating is so tenaciously adherent to the
metal and so ductile that it will bend with the
wall without fracturing or ?aking, even when 25
the wax is at a refrigerating temperature.
The container produced above has all the ad
vantages of the glass bottle, both as to ease in
‘sealing and opening the container, and as to
non-injurious effects upon the beverage. It has
the added advantage that it does not transmit
lightjso that the beverage is maintained free
from any injurious effect of light rays thereon.
The,container as described has the further ad
vantage of cheapness in cost of manufacture so 35
that it may be thrown away after it is opened
and the beverage dispensed therefrom, and thus
the expense of reclaiming the container for use
is avoided. Nevertheless, the containers may be
re-used, if desired, and can be readily cleansed 40
Therefore, when the container is cooled, it-will ' and sterilized, ready for re?lling through the
be lined with a coating of wax which tenaciously
adheres to the metal. This wax covers every
particle of the metal, and extends even through
45 the mouth to the outer face of the container.
When the closure cap is applied to the con
tainer, therefore, the lining thereof will contact
with the lining of the container, and when the
container is sealed, every particle of metal
50 throughout the entire container including the
closure is covered by a material which is chem
ically inert to the action of the beer thereon,
so that the beer will not cloud or be otherwise
affected through contact with the metal.
The application of the hot wax to every part
of the interior of the container renders the sur
face of the container completely sterile. When
the container is cooled, a coating or lining is
formed which tenaciously adheres to the walls
60 thereof covering the side seam and the double
seams at the top and bottom of the container
so that when ?lled with a beverage there is no
chance of its contacting with the metal.
After the container has been coated with the
65 wax, and the wax properly set or hardened by
cooling, the container is then preferably passed
immediately, while still sterile,'into a ?lling ma
chine where it is ?lled with the beverage that is
to be stored therein.
Instead, however, of applying the coating at
the time when the'container is to be ?lled, it may
be coated by the manufacturer of the container
rather than by the packer.
In the packaging of, beer, the containers are
75 passed through a suitable apparatus for impart
applying of a new coating of the petroleum wax
to the interior thereof.
This application is a continuation in part of
my application Serial No. 23,751, ?led May 27, 45
While the invention as illustrated is applied
to,a container wherein one of the ends has a
?lling and pouring opening, closed by a cap, it
will be understood that the shape of the con— 50
tainer and the manner of closing the same may
be greatly varied without departing from the
spirit of the invention set forth in the appended
claims. While it may be practicable to coat a
sheet of metal with an enamel and die shape a 65
blank out therefrom to form a can end without
breaking the enamel, a- body for a container
cannot be formed by coating the metal in the
?at with an enamel and thus produce a protec
tion so that the contents of the can will not 60
come in contact with any metal whatever, for
the reason that after the body portion is formed
and the edges interlocked a solder bond is neces
sary toseal the‘ side seam and the liquid content
under pressure may work into the side seam 65
and contact with the solder. It is essential
therefore that the body portion at least of the
container shall be coated with‘ the petroleum
wax, so as to completely cover the crevice leading
to the solder bonded side seam.
Having thusdescribed the invention, what I
claim'as new and desire to secure by Letters
Patent, is-
1. A container for beverages including a body
portion and a lining completely covering and
tenaciously adhering to the inner surface of the
body portion, said body portion being formed of
sheet metal, said lining being formed from pet
acterized by having a melting point of approxi
mately 160° F._, and of being ductile at approxi
mately 40° F., whereby the lining is undisturbed
rolatum waxes- separated in the de-waxing of
the pasteurizing of the beverage and remains
residual lubricating oils and characterized by ‘ in.
unbroken upon the bending or ?exing of the 5
having a. melting point of approximately 160° body
wall of the container at ‘refrigerating tem
F., and of being ductile at approximately 40° F., peratures.
whereby the lining is undisturbed in the pasteur
3. A container for beverages including a body
izing of the beverage and remains unbroken
and a lining ‘completely covering and te
upon the bending or ‘flexing of the body wall of portion
naciously adhering to’ the inner surface of the
the container at refrigerating temperatures.
body portion, said body portion being formed
2. A container for beverages comprising a
of sheet metal, said lining being formed from
sheet metal body portion, sheet metal ends petrolatum
waxes characterized by having a melt
seamed thereto, one of said ends having a ?ll
ing point of approximately 160° F., and of being
lng and pouring opening and a closure for said ductile at approximately 40° F., whereby the lin
opening, and a‘ lining completely covering and ing is undisturbed in the pasteurizing of the
'tenaciously ‘adhering to the inner surface of the beverage
and remains unbroken upon the bend
body portion and the ends, said lining being
ing or ?exing of the body wall of the container
formed of petrolatum waxes separated in the de-' " ‘at
20 waxing of residual lubricating oils and char
refrigerating temperatures.
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