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Патент USA US2121404

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June 21, 1938).‘
J. H. O’NEIL
2,121,404
METHOD OF COATING SHEET METAL CANS
Filed Aug. 1'7, 1936
3 Sheets-:Shee’r. l.
June 21, 1938.
J; H. O’NEIL,"
‘
' 2,121,404
METHOD OE‘ COATING SHEET METAL CANS
Fixed Aug. 1'7,‘ 1936
@
3 Sheets-Sheet 2 '
‘4mm, 193a.
"
JMO’NEIL
-
‘
2,121,404
METHOD OF COATING SHEET METAL CANS
Fil‘ed Aug? 1?, 193a
'
s SheetsL-Sheet 3 -
£1
q
/
‘.2
4
> Patented June 21., 1938
2,121,404
UNITED STATES PATENT OVFFICE'
2,121,4q4
.
METHOD or COATING SHEET METAL cANs
James H. 'O’Neil, Syracuse, N. Y., asslgnor to "
_
Continental Can Company, Inc., New York,
N. Y., a corporation of New York
Application August 17, 1936, Serial vNo. 96,502.
3 Claims.
‘The invention relates to new and useful im-~
provements in a method for coating sheet metal
'
cans.
.
..
'
.
An object of the invention is. to provide a
5 method of coating sheet metalcans on the-in
terior thereof with a thermo-plastic material
whereby a coating of substantially uniform thick
ness completely covering the interior of the can
may be provided.
A further object of the invention is to provide
a method of coating a can having a neck portion
terminating in a sealing lip wherein a vacuum
- creating means may be? utilized for drawing air
from the can in such a way as to remove, excess
(01. '91_ss) ,
'
stantially uniform‘ layer on the inner surface of
the dome.
During the draining, wax will accu
mulate at the inner surface of the sealing lip
forming a thickened coating which is likely to
be thrown from, the can on to the outer face of
the lip when the can is quickly inverted.
The present invention has to do particularly
with the removing of this excess wax accumulat
ing on the inner and outer surfaces of the seal
ing lip of the can. It is believed that the ‘in? 10
vention will be better understood by a detail
description of the can and’ the apparatus for
carrying out the improved method of coating the
interior of the can.
15 coating material accumulating on the inner and
In Fig. 1 of the drawings, a can is shown in 15
vertical section which has been coated and is in
draining position. The can consists of a body
In the drawingsportion I which is, as shown, cylindrical in cross
Figure 1 is a vertical sectional view showing a‘ section. The bottom end 2 is secured to the body
20 can in inverted position, for draining the excess by a double seam 3. This bottom end is dome
20
coating from the can; .'
‘
shaped as indicated at 4. At the top end of the
Fig. 2 is a vertical sectional view of a can hav-v can body is a closure end 5 which is double
ing a coating applied to the inner surface thereof seamed to the can body at 6. This top end has a
outer faces of the sealing lip during the drain
ing thereof.
25
-
'
\
by the method embodying the invention;
cone-shaped portion extending above the double
Fig. 3 is a view in vertical section showing a
portion of an apparatus for carrying out the im
seam and terminating in a neck ‘I. The neck is
proved method;
r
Fig. 4 is a view showing a can after draining
and prior to the subjecting of the same to the
30 suction means for drawing the air from the can,
and
,
Fig. 5 is a ‘view similar to Fig. 4, but showing
the air drawn from the can and the excess wax
accumulating at the inner and outer surfaces
of the sealing lip removed by the ?ow of airfrom
the can.
--
'
In the patent granted Alfred L. Kronquest,
June 15, 1937, No. 2,084,093, there is shown a
‘machine for coating cans with a thermo-plastic
40 sealing material. The can coated is of the type
4
inturned to form a sealing lip 8 and a locking 25
shoulder 9, so that a crown cap'may be applied
to the sealing lip and the ?ange thereof crimped
underneath the shoulder 9 for sealing the can.
In carrying out the invention, the thermo
plastic material is reduced to ?uid form by heat 30
ing and is then ?ooded over the inner surface of
the can through a nozzle which is projected into
the can as shown in the Kronquest patent
above referred to. As the surplus material drains
from the can, a thin ?lm or lining of the thermo 35
plastic material will adhere to the inner surface
of the can. The lining is indicated at II] on Fig.
1 of the drawings. During this draining of the
wherein the top end is provided with a raised
cone-shaped portion terminating in a neck hav
petroleum wax from the can, a drop of wax will
form as indicated at H. The sealing lip 8 of the ' 40
can extends inwardly substantially horizontally, '
ing a sealing lip and a shoulder so that a crown
cap can be used for closing the can. The can is
and the inner edge is preferably rolled back upon
the inner surface of the sealing lip. This forms
160° F. or above.
in Fig. 4, and thus form an excess of wax which
is objectionable. Some excess wax may adhere
coated with a thermo-plastic material, preferably moreor lessv of a trap so that the wax draining 45
of petroleum wax, which has a melting point of from the can will accumulate as indicated at l2
The wax is reduced to a ?uid
form by heating and is then discharged through
a nozzle into the can while it is inverted, and . to the outer surface of the lip 8 during draining
thus the entire inner surface of the can is ?ooded
with the ?uid wax.
As the excess wax drains
from the can, it will form a‘uniform layer over
the greater portion of the inner surface of the
55 can. due to the wax adhering to the metal. When
which is also objectionable. It is found that if
the can while the wax is still in a semi-?uid con
50
dition, is turned back to an upright position, the
drop of wax accumulating at the center of the
dome will distribute itself evenly over the dome
shaped bottom. When. however, the can is
the can has a dome-shaped bottom, the drain- ' turned from an inverted position to an upright 55
ing of the wax will cause a drop of wax to form position quickly, this accumulation of wax at
at the center of the inverted dome. If the can is
inverted quickly while the wax is in ?uid form,
60 this drop of wax will ?ow so as to form a sub
the inner surface of the sealing lip which is in
dicated at l2 in the drawings, is likely to be
thrown from the can mouth and lodge on the 60
2,121,404_
2 .
which accumulated on the center of the dome
during draining, will as above noted, distribute
outer side of the lip. It is very, objectionable to
have wax on the outer face of the sealing lip,
for the reason that when the crown cap is forced
. itself evenly over the dome-shaped bottom.
into contact with the sealing lip, it will prevent
an efficient seal.
The purpose of the present invention is to pro
vide a method whereby this excess wax‘ on the
inner surface of the sealing lip may be removed
Associated with the turret is a ring member 21
which is stationary and which has a chamber
28 therein. A port 29 at a certain section of this
ring member 21 registers with a port 30 con
necting with the port l9. This ring member 21
so as to leave a thin lining in the region of the
10 sealing lip which will not be thrown from the
can when it is turned to a righted position. The
apparatus as shown in the drawings includes a
standard 13 around which a turret I4 is mounted
for rotation. This turret has an outwardly pro
15 jecting portion I5 on which is mounted a series
of nozzles 15. These nozzles are all of similar
construction and a description of one will answer
for the others. The nozzle is mounted on a sleeve
shank 11 which ?ts within a recess formed in the
20 member IS.
A set screw I8 clamps the nozzle
?rmly in the recess. This member I5 is provided
with a port l9 and the sleeve shank of the nozzle
has an opening 20 therein connected to the port
' IS. The nozzle 15 is tapered and the can indi
25 cated at C in the drawings, is inverted over this
nozzle and rests on the nozzle. The can is fed
is connected to a pipe 3| which in turn is con
nected to a suitable vacuum creating means. The
wax taken up by the air current passes into the
vacuum creating means and may be separated
therefrom by a suitable strainer. There, are a
plurality of nozzles, and these nozzles, one after
another, receive cans and are brought into opera
tive connection with the vacuum creating means
for carrying out the method above described.
The novel method consists in the closing of the
can while in inverted position and the drawing of
the air from the can by the suction means which 20
causes the air current to ?ow over the excess
wax on the inner surface of the sealing lip so as
to remove the same. The method also includes
the step of drawing air across the outer face of
the sealing lip after the air has been exhausted 25
from the can.’
into a pocket 2| in the turret and is held in the
pocket by a guide rail 22. The shoulder 23 is so
dimensioned relative to the nozzle that the can
30 body normally rests von the nozzle with the ta
Having thus described the invention, what I
claim as new and desire to secure by Letters Pat
ent is:—
l. The method of coating a sheet metal can 30
having a neck portion terminating in a sealing
of the can. The inner edge of the sealing lip
contacts with the nozzle and this contact is main
tained by the weight of the can body.
The nozzle has an annular recess 24 extending
35
around the upper end thereof. A cap 25 extend
ing into the nozzle overhangs this recess so as to
lip with a thermo-plastic material, consisting in
pered portion thereof extending into the mouth
form an annular channel.
The nozzle l6 has a
series of ports 26 which open into the sleeve l1
at their lower ends and into the channel 24 at
their upper ends. It will be noted that when a
can restsg'on the nozzle, the inner surface of the
sealing lip at the inner edge " thereof contacts
with the nozzle just below the channel 24. The
45 port 19 is adapted to be connected to a suction
creating means, and this will cause the air in the
can to ?ow out through the ports 26. As the air
?ows out through the ports 26, it will follow the
direction of the arrows indicated in Fig. 4, that
50 is, the air current will sweep down against the
thickened layer of wax on the inner surface of
‘the sealing lip, and the wax will be gradually
taken up with the ?owing air current until the
layer of wax is thinned as indicated in Fig. 5
55 of the drawings. The suction force can be/ ad
justed so that the excess wax is removed and a
. thin layer of wax remains covering the inner sur
face of the sealing lip and the parts adjacent
thereto when all of the air has been drawn from
the can. A continuation of the suction pull will
cause air to press against the under face of the
sealing lip as indicated by the arrows in Fig. 5,
and this will raise the lip su?iciently from the
nozzle to permit air to pass into the mouth and
65 out through the ports. , This shifting of the air
current to the outside of the sealing lip will1
remove any feather edge of sealing material ex
tending around on to the outer face of the sealing
lip so that there is only a thin even layer of wax
70 adhering to the inner edge of the sealing lip and
the outer face thereof.
Inasmuch as the excess wax accumulating on
the inner surface of the sealing lip has been
removed, the can can now be quickly righted to
75 the position shown in Fig. 2, and the drop of wax
?owing the material while in ?uid condition over
the entire inner surface of the can, draining the
surplus material from the can, subjecting the 35
can to a vacuum creating means for drawing air
from the can, and directing the ?ow of the air
from the can so that it passes across the ma
terial accumulating on the inner surface of the
sealing lip during draining for reducing the coat 40
ing thereon to a thin adhering covering.
2. The method of coating a sheet metal can
having a neck portion terminating in a sealing lip
with a thermo-plastic material, consisting in
?owing the material while in ?uid condition 45
over the entire inner surface of the can, draining
the surplus material from the can, subjecting the
can to a vacuum creating means for drawing air
from the can, and directing the ?ow of the air
from the_ can so that it passes across the material 50
accumulating on the inner surface of the sealing
lip during draining for reducing the coating
.thereon to a thin adhering covering, and then
causing air to ?ow across the outer face of said
sealing lip for removing coating material there 55
from.
‘
3. Themethod of coating a sheet metal can
having an inwardly curved dome-shaped bottom
end and an outwardly extending cone-shaped top
end, terminating in a neck portion provided with
a sealing lip, consisting in ?owing the material
in ?uid condition over the entire inner surface
of the can while held in an inverted position,
permitting the material to drain from the can,
subjecting the can to a vacuum creating means 65
for drawing air from the can and directing the
flow of the air so that it passes across the ma
terial accumulating on the inner surface of the
sealing lip during draining for reducing the coat
ing thereon to a thin adhering covering, and sub
70
sequently placing the can in an upright position
while the coating material is suiiiciently ?uid to
permit excess material gathering at the center
of the dome to be distributed over the dome.
JAMES H. O'NEIL.
75
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