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Патент USA US2133214

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Oct. 11, 1938.
- H. T. SCOTT
2,133,214
COATING APPARATUS
Original Filed Oct. 16, 1934
5 Sheets-Sheét 1v
CRWMWIL
oét. '11, 1938.
H. "r. SCOTT
2,133,214
COATING APPARATUS
Original Filed Oct. 16, 1934
5 Sheets-Sheet_2
Oct. 11, 1938.
2,133,214
H. T. SCOTT
COATING APPARATUS
Original Filed Oct. 16, 1954
5-5
1
FIJ.
________,._______
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5 Sheets-Sheet 5
Oct. 11, 1938.
2,133,214
H. T. scoTT
COATING APPARATUS
originalriled Oct. 16, 1954
5 Sheets-‘Sheet 4
WWW/mm
_
Oct. 11, 1938.
H. T. SCOT'II"
’ 2,133,214
COATING APPARATUS
Origi?al Filed Oct. 16, 1934
‘ 5 Sheets-Sheet 5
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................. .0
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Patented Oct. 11, 1938
' 2,133,214.
UNITED ‘STATES PATENT OFFICE 2,133,214
'
COATING APPARATUS
Henry T. Scott, Toledo, Ohio, assignor to The~
'
American Paper Bottle Company, Toledo, Ohio,
a corporation of Ohio
'
'
Original application October 16, 1934, Serial No.
' 748,563.
Divided and this application October
29, 1936, Serial No. 108,258v
12 Claims. (CI. 91-46) ,
'
.
This invention relates to coating apparatus and that all contained air is expelled. After the con
particularly to apparatus for applying coatings to tainer has‘ been completely submerged it is car
containers primarily intended for the packaging .ried through the pa'ra?ln bath in such manner
that all of its surfaces are thoroughly exposed to
and dispensing of liquids.
In Patent No. 2,047,891, issued July 14, 1936, is ‘the par'aihn, the container not being positively
disclosed a paper container which, while well held by any of the carrying mechanism but being
adapted to serve as an envelope for commodities
so transported in a carrier that it may have
of various kinds, is particularly suitable for the
limited movements relatively to the carrier in all
directions and may freely respond, to a limited
‘ packaging of liquids. It is fabricated of relatively
10 stiff paper and is in the form of a tube of rec
tangular cross section with its upper and lower
ends sealed. Where liquids are to be charged
into the container prior to sealing it is essential
that the container in its entirety be given a coat
extent, to the surging movements of the para?in 10
bath brought aboutby the operation of the mech
anism.
Each individual paper ?ber of the con
tainer, both upon the outer and inner surfaces
thereof is so exposed to the coating substance that
ll ing of some substance which will render the same
the container as it issues from the bath is com
liquid proof so that no leakage may subsequently
occur. The coating material which I may employ
pletely and thoroughly coated with the impreg
nating substance.
20 packaged. Where food products are to be'pack
-
This application is a division of my copending
may vary considerably, or in accordance with the
characteristics of the materials which are to be
application Serial No. ‘748,563, ?led October 16,
20
' 1934.
aged, particularly milk or milk products, it is
highly desirable that the liquid proo?ng coating
substance should be of such character as to re
main neutral in the presence of the liquid contents
of the package while at the same time performing
its function of preventing contact with the paper
of the liquid contents of the container, thereby
preventing softening of the walls of the con
tainer and alsodoccupying any minute openings in
30 the paper itself ‘or between the joints of the con
tainer and thereby preventing direct leakage.
The mechanismv which comprises the subject
matter of the present invention has been designed
While primarily the coating apparatus which I
disclose by way of example is designed for the
handling and treating of paper containers of
square cross-section, it will be obvious to one
skilled in the art that, by making changes in the 25
design and arrangement of the component ele
ments of the invention, the apparatus may be
readily adapted for the coating of containers‘
which vary widely in shape, size and materials of
construction.
30
I
In the drawings:
I
'
especially to receive from a container fabricating
machine a container of the'type shown in my
Figure 1 is a view of the coating apparatus
taken from the ‘side, many of the parts being
shown in section and others having‘ been removed
for the purpose of more fully disclosing interior
patent above referred to, to move this container
details;
through a bath of molten paraffin to drain the '
excess parailin therefrom after issuing from the
bath, and ?nally to eject the container from the
40 para?lning apparatus and to position the same so
as to be readily engageable by a conveyor mecha
nism for transporting _ to other apparatus for
charging, closing and sealing. The container as
_
_
Figure 2 is a view of the apparatus as it would
be seen from the right (Figure 1) certain of the
operating'parts being shown in elevation and
certain parts being broken away to show the 40
underlying elements;
' Figure 3 is a" view of theapparatus-as from
the left, (Figure 1) certain of the~parts being
it comes to the para?ining unit has its bottom . shown in section and others partially ‘broken
,
45 closed and top open. It is introduced into the ‘away;
Figure 4 is a side elevation, partly broken away,
bath of paraffin bottom end foremost so that the
molten para?in has access to the interior of ‘the of a container receiving unit which forms part
I
container only after the open end of the container of the apparatus; ‘ I
has been moved below the surface -of the paraffin
bath. As the container ?lls 'with paramn the air
which is contained therein is displaced by the
paraf?n, the incoming stream of paraffin running immediately to the bottom of the container and
a
Figure 51s a section on line 5-5 of Figure 1;
Figure 6 is a section on line 6-6 of Figure 1; 66
Figure 7 is a section on line 'I—‘| of Figure 3;
Figure 8 is a section on line 8-8 of Figure 6;
and
e
.
perspective view of one of
Figure 9 is a
the level of the liquid rising rapidly from the bot
tom toward the open top thereof thus insuring . container carriers.
the
2
2,133,214
The apparatus is designed for the rapid han
Idling of a continuous series of paper containers,
receiving successive containers presented to it,
passing these containers through the parai?n
bath and effecting the discharge thereof. It is
primarily intended to form portion of a rapidly
operating automatic machine in which blanks are
rapidly detached from a pack, erected into tubu
lar form, closed at one end, coated, charged,
10 closed and sealed.
15
v20
25
30
It may of course be made to
have any desired capacity and rate of operation.
The casing or housing in which the bath of
paraffin is enclosed and which also houses the
operating ports of the coating mechanism is in
dicated at III, the lower portion of this housing
being especially designed for the retention of a
substantial body of molten para?in while the up
per portion may be of lighter construction. A
removable bottom plate is indicated at H and
this plate may be taken off whenever it is desired
to clean the apparatus. The normal para?in
level is indicated by the letter L and it will be
understood that additional quantities of paraii‘ln
will be introduced from time to time to replace
that which passes out in the shape of surface
coatings upon the containers which pass through
the apparatus. A conveyor chain is indicated at
|2 this chain being endless and is supported upon
three sprockets l3, l4 and I5 one of which, as
for instance the sprocket l5, may be intermit
tently driven by any suitable mechanism. A
guide l6 serves to support the conveyor chain at
' one point where it changes the direction of its
travel. Mounted upon certain of the individual
35 links of this chain are container carrying ele
ments I8 and there are a relatively large number
of these elements, only a few being illustrated.
Carriers l8 are closely spaced and the chain isso
driven that each carrier is advanced from its
40 container receiving position, indicated at B in
Figure 1, to its container discharging position,
indicated at D, by a series of step‘ by step move
ments. One of the carriers is shown in perspec
tive in Figure 9 and it is shown in this ?gure at
45 the angle which it makes with the horizontal
when the conveyor chain link to which it is se
cured is moving in a vertical path. It comprises
end of the carrier and safeguarding these ends
against injury from such contact.
The carriers shown to the right (Figure 1) de
scend in the operation of the device and are emp
ty. As each carrier reaches the position of the
carrier indicated at B the motionof the conveyor
chain is temporarily halted and a container is
introduced into the same to occupy the position
shown in Figure 9. The means for introducing
the container will now be described.
10
A container receiving chute is indicated gener
ally at S, this chute being vertically disposed to
receive containers successively dropped into the
same by mechanism which is not illustrated.
The
chute includes oppositely facing stationary guide
plates 30 and oppositely facing swinging guide
plates 3|. Plates 3| are secured at their lower
ends to the upstanding side members 32 of a
U-shaped‘ frame generally indicated at 33.
Frame 33 has integral therewith a laterally ex
tending cylindrical bearing member 34 which is
rotatably supported upon a cylindrical stud 35
mounted in the end of a supporting frame‘ mem
ber 36. The frame, therefore, together with the
plates 3|, may swing or oscillate about the axis of
stud 35 from the position in which it is shown in
Figure 4 to the position in which it is shown in
Figure 5. Assuming that a container is dropped
into the chute with open end lowermost, as indi
cated at C’ in Figure 4, the swinging motion of
the movable portion of the chute, including the
plates 3| and frame 33, effects the movement of
the container. to the position indicated at C2 in
Figure 5, the closed bottom of the container being
then lowermost and the container occupying a
position inclined to the horizontal.
To effect this swinging movement, the frame 33
is operatively connected to a drive shaft'31, the
teeth of a segment 33 integral with sleeve 34
meshing with the teeth of a second segment 39 40
pivotally mounted upon a stud 40 and segment
39 being integral with an arm 4| which is con
nected by means of a link 42 with the upper
end of a‘ lever 43, lever 43 being pivoted to the
frame at 44 and carrying a roller 45 which lies
within a camway formed within a cam 46 mounted
upon shaft 31. Rotation of cam 46 therefore re
, essentially a ?ve-sided. box-like member with
sults in oscillation of the frame from its upper
.somewhat greater interior dimensions than the
50 exterior dimensions of the container, indicated
at C in chain lines, which it is to house and to
transport through the bath. Any suitable means
vertically disposed position to its lower inclined
may be utilized for securing the rear wall of the
container to a chain link and the rear wall of the
55 carrier, which faces the open side, is also provided
65
70
75
The movements of the container positioning‘
frame just described are coordinated with the
movements of the conveyor chain and, when a
container has been removed to the position indi
cated at C" in Figure 5, it is in register with the
?n may enter the carrier and which also permit carrier B within the housing In, and also in reg
the introduction of ejecting rods for effecting ister with an aperture formed in the wall of the
the discharge of the container, in a manner to housing. It is therefore in a position to be moved
laterally inwardly of the housing and into the
be hereinafter more fully described.
mouth of carrier B which is positioned to receive
The other two larger walls of the carrier, indi
cated at 20 and 2|, are imperforate and the wall it. The means for effecting this inward move
20 is also curved or made concave, as shown, ment includes the pusher 40' slidably mounted
while the wall 2| is preferably ?at. The end upon the frame for horizontal movement, the
walls of the carrier have apertures 22 formed pusher 40' having the same inclination to the
horizontal as have the apertures formed in the
therein to permit the free entry and escape of housing and also the carrier B. For effecting
liquid paraffin. That end of the carrier which sliding movement of the pusher it is connected to
is lowermost at the time that the container to be an intermittently oscillating lever 4|’ by means
coated is introduced therein, is provided with an of link 42', lever 43’, and link 44', the lever 43'
70
inner central transversely extending rib 23 which . being mounted upon a fixed pivot 45'.
acts as a limiting stop for the movement of the
The means for oscillating lever 4| ' is not illus
container toward that end of the carrier during trated, but it will be understood that any suitable
the para?ining operation, thus preventing the means may be employed to operatively'connect
end ?aps E of the container from striking the this lever to shaft 31 and to produce oscillations 75
with a series of apertures |9 through which paraf
60
position in timed relation to the other operating
parts of the mechanism.
3
2,188,214
Frame member ‘I has a hub“ which is keyed
of this lever at properly timed-intervals. Imme
diately after oscillating to thrust a container 0 to stud “so as to‘ be rotatable therewith, hub
laterally into the carrier B the pusher is retracted . 66 lying intermediate‘ hubs 66 and 6! ,of frame‘
and the frame 33 and blades 3| are swung to ver- - member ii. A springxpressed detent I‘! carried
tical position to receive a-following container. by hub it normally hasits outer end projecting
The conveyor chain is actuated and as the carrier within shallow recess 68' formed‘ in hub 62 and.
just changed moves downwardly, an unloaded hence hubs 62, 63 and 68 wlllnormally rotate in
carrier coming into register with the container unison about the axis of stud 04.. Secured to the i '
charging opening formed in" the housing wall and ends of ‘frame members BI and.” respectively
'10 ready to receive the next following container. are the guiding and retaining blades ‘II which are 10
The carrier. B within which a container has just container holding members, having inturned outer
been placed will be moved downwardly into the ends 10' to insure retention of thecontainer as
para?in bath, thence horizontally toward the left the entire frame as an entirety swings’ down
‘ (Figure l) , and ?nally upwardly until it occupies
15 the position D. 1
As may be seen from an inspection of Figure 1,
one of the bottom edges of thecontainer C ?rst‘
reaches the level of the upper surface of the
'20
paramn and the bottom of the container is lower;
most during the time that the container is actually undergoing the process of immersion so that
any air originally within the same'is displaced by
, molten paraffin, ?owing upwardly and making its
escape from the paraf?n bath. Eventually the
25 carrier turns around the axis of sprocket l3 and
assumes a horizontal position. In this movement
the open side of the carrier is turned downwardly
and, when the carrier has reached a completely
horizontal position, as indicated at B’, is facing
30 directly downwardly, the container either resting
against that wall of the carrier which has hereto
fore been designated the rear wall, and which is
as
connected‘to the associated chain link, or resting
against the curved guide plate 41 and being moved
along this plate by the action of the carrier.
When the carrier reaches the position indicated
at B3- the container which it carries is about to
wardly.
'
'
-
'
As will be seen from Figure 6, a container just 15'
discharged from the housing ‘will occupy the posi
tion C3, its open end being lowermost. It will
be understood of course that as the container is
ejected from the housing, the receiving‘ frame
just described is in register with the aperture
formed in the housing. A rotatory movement is
then transmitted to the stud 64 by mechanism
which is ‘illustrated in Figure 3 and is seen to
include a segment 1| ?xed on stud 64, the teeth
of this segment meshing with the teeth of a
segment 12 pivotally supported at 13' upon a
frame member. Oscillation of segment 12 is ef
fected by means 'of link 14 the lower end ‘of
which is connected to a lever 15 carryinga roller
16 which is-in engagement with a cam 11 mount
ed on shaft 31.
Two cushioning springs 18, adapted to be en
gaged by one or the other. of abutment 19 respec
tively on link 14, dampen shocks incidental to the
operation of the ‘mechanism just described, the
adjacent ends of these springs bearing against a
common central spring abutment 80.
By reason of the fact that the hubs of frame
emerge from the para?in bath with its closed bot- , members 6| are not positively connected to the
tom uppermost so that the para?in will drain
rapidly from its interior.‘ Eventually, and after a
further series of step-by-step movements of the
conveyor, the carrier with its coated container
oscillating driving studs 64 but are only releas
ably connected to this stud through the inter 40
mediary of the detent 61, it is not possible for
reaches the position D (Figure l) , and may then
be ejected from the housing. For the purpose of
45 bringing about this ejection, an ejecting mecha
nism is provided which includes a plurality of
tainer come to rest after having been only par
tially introduced into the rocking frame and be
tween the container supporting blades 10, por 45
tion of the container‘ for instance still overlying
breakage to occur should for‘ instance a con
parallel ejecting ?ngers 50 supported at their 'the edge of the discharge aperture formed in the
rear ends upona vertically disposed plate 5| the
lower end of which is slidably supported upon
50 guide rods, one of which is indicated at 52.
Each ?nger 50 is in alignment with an aper
, ture formed in a perforated guide plate 53 and
also in alignment with the perforations l9 formed
in the rear wall of carrier D when thatcarrler
has reached the discharge position shown in
Figure 1. Slide 5| is operatively connected by
means of a link 54, lever 55 and link 56 with
the upper end of oscillating lever ll previously
referred to and will be reciprocated forwardly and
60 rearwardly when lever 4| is actuated. When re
ciprocated forwardly or to the left (Figure 1), the
465
housing.
Should the rocking frame, including .
members GI and 65, start downwardly with a con
tainer in such position as this the opposition to 50
the movement of frame member BI and its as
sociated blades 10 offered by the container will
‘he su?iciently great to‘ cause the detent 61 to be
cammed into its receiving recess and out of recess 55
68, thus permitting rotation ‘of hub Stand frame
member 65 relatively to hubs G2 and 63 and frame
' member 6|.
The operator perceiving the sepa-v _
ration of the two elements of the transfer frame
will stop the machine and remove the jammed
container whereupon the frame member 6| may
?ngers 50 after passing through the perforations :be again swung to its normal relative position
in guide plate I3 and through the registering with respect to frame member 65, the detent 61
perforations I! in the rear wall of the carrier D again entering recess 68 and releasably locking
65
will contact with the inner wall of the container " the hubs together.
After a container discharged from the housing
0 housed within the carrier and will thrust this
container outwardly through an aperture formed
in the housing to permit its passage and into a
rocking frame 60 which at that instant is posi
tioned to receive it. The rocking frame 80 in-4
in a normal manner has been lowered to the posi- .
a supporting stud,“ so that this frame member
tor 82 which comprises an angular member the
lower horizontal end of which is secured to a re
tion in which it has been indicated at C4 in Fig
urge‘6 it is to be removed from between the arms
‘Ill and moved forwardly into a position to be en
. eludes a member 6| one end of which is provided , gaged by a conveyor. This movement from be
' with two hubs 62 and 63 rotatably mounted upon - tween arms ‘lli is effected by means of an extrac
may have swinging movement about the axis of
75 stud 64.
70
ciproeable member II and the vertical portion of 76
4
2,188,214
which lies parallel to the housing wall and, in its
rearmost position, lies within a recess formed
within the housing wall. Member 83 is guided
in its reciprocating movements by means of paral
lel guides one of which is indicated at 84 and to
the under side of this member is secured a rack 85
the teeth of which mesh with the teeth of a gear
86 ?xed upon a shaft 81. Shaft 81 is rotatably
supported in a bearing 88 and carries at its outer
10 end a pinion 89 the teeth of this ‘pinion meshing
with the teeth of a rack 90 slidably supported for
longitudinal movements and carrying a roller 9|
which lies within a camway formed in the rev
oluble cam 82 also ?xed on shaft 31. Revolu
15 tion of cam 82 therefore results in reciprocating
movement of slide 83 and hence causes the ex
tractor ?nger to move outwardly between blades
18 at the proper time and to remove a container
which may be standing between these blades.
20
As mentioned previously, the container will then
pass on to a suitable conveyor which is not il—
lustrated. The transfer frame including frame
members GI and 65 is enclosed save for a con
tainer outlet port formed in the forward wall
25 thereof and within this housing is located a heat
into the para?in bath, to the horizontal position,
the sides of the container which were previous
ly vertical,‘ become horizontal and the air and
moisture locked in the pores of the paper may
escape more easily from these sides. Further
movement of the container through the para?in
bath is accompanied by rotation thereof so that
the two remaining sides are in an approximately
horizontal position facilitating the escape of the
air and moisture. The movement of the con
zontal or at least causes them to assume substan
tial angles to the vertical. This is desirablelinas
much as the moisture content of the paper, as
well as the minute quantities of air caught in the
interstices of the ?bers, are more readily dis
the lower portion of a vertically disposed paper
sheet will tend to re-attach themselves as they
move upwardly or downwardly, as the case may
be, along the surfaces of the sheet. When the
sheet is horizontally disposed, or disposed at a
a heating medium such as steam, as it'is desired
to maintain the paraffin upon the container walls
in liquid condition at this point. Also mounted
30 upon this housing is a steam chamber 94 for main
of moisture or air once discharged will rapidly
at the proper point‘.
'
The various mechanisms described are of
course actuated in a desired timed relationship,
35 a container to be coated being inserted into an
empty carrier at the same time that a coated
container is being ejected from the housing.
I find it to be» preferable, in fabricating con
tainers to be subsequently coated vwith a coating
40 substance such as paraffin, to utilize a paper
which is porous in order that the paraffin may
15
lodged from horizontally disposed paper surfaces
than from vertically disposed paper surfaces.
Thus particles of‘ moisture and air expelled from 20
ing unit, in this case including the conduit 93, for
taining the interior temperature of the housing
10
tainer through the bath is such that the container
is rolled within the bath to present the several
sides of the container successively to the hori
substantial angle to the vertical, any particles
separate themselves from the sheet by moving
vertically upwardly or downwardly and will not
30
have opportunity for 'such re-attachment. It is
important, therefore, that the mechanism be'of
such character that the container as it passes
through the bath causes each of the ?at sides
thereof, at one time or another, to be disposed
either horizontally or at a substantial angle to
the- vertical.
It will be appreciated that, due to the fact that
the container has parallel opposing side walls,
when it is disposed in a truly horizontal position,
air expelled from the upper surface of the lower 40
penetrate into the interstices thereof.
Hard ' side wall, and some air expelled from the vertical
side walls may, upon rising, be intercepted by
the upper horizontally disposed side wall and
trapped against the lower surface thereof. Like
45 uniform over the surface of the article made
papers can be rendered liquid-proof only with
great di?iculty and the coating is often non
therefrom.
To insure that the paper used has
the necessary mechanical strength and stiffness, '
and at the same time the necessary porosity, a
somewhat thicker sheet is used than would be
50 necessary were the paper harder.
A paper of
the solid bleached sulphite type having a weight
wise water expelled from the upper side wall and
vertical walls will descend and be intercepted by
the lower horizontal side wall. Because of the
further rolling motion imparted to the container,
however, any such intercepted water or air is
not permitted to remain upon or cover any'spot
of approximately .028 pound per .001 inch thick
upon which it is originally deposited, but will be
ness per square yard has been found to be satis
factory. Kraft paper may also be used and also
caused to flow laterally so that at one time or
another every portion of the entire area of each
combinations of kraft and sulphite papers. In
any event, paper of the desired porosity will
have a considerable nap comprising projecting
'?bers or ?laments and it is desired that all of
wall of the container is fully exposed to the bath.
My invention. contemplates the provision of
any suitable‘ means for‘ passing paper articles
successively through a bath of para?'ln and by
these projecting ?bers be thoroughly coated dmw
ing the coating operation
As the container enters the pra?in bath, the
moisture and air between the ?bers of the paper
is expelled by the action of the para?in. It is es
sential that the spaces left vacant by the ex
a clusion of moisture and air be ?lled with coating
materlal so that a continuous leakproof coating
is provided. As the container enters the para?in
bath, its lowermost side wall is ?rst presented to
the liquid paraffin in such a position that the air
and moisture in the pores of the ‘paper may pass
freely upward. Following, this, the then upper
most side wall will be-so presented and immersed.
The bottom also is disposed at such angle that
the discharge of moisture and air therefrom is
75 facilitated.‘ As the container progresses further
means of which the positions of the articles are
so changed during their progress through the
paraf?n that each of .the several sides of each 60
article are at one time or another disposed either
horizontally or at an angle which so departs from
the vertical that the moisture andv air particles
may freely rise or fall therefrom,,depending upon
the speci?c gravity thereof as compared with
that of the bath.
' The carriers which I employ for the purpose
of immersing the containers are sumciently large
interiorly to permit limited axial and transverse
movements of any container housed therein dur 70
ing the coating operation. The containers will,’v
to a considerable extent, oscillate within their re
spective housings in passing through the bath
due to the surging of the para?in bath itself,
produced by the action of the carriers which are
5
. 2433,2914
successively entering the bath upon one side and conveniently regulated by varying the depth of
successively leaving it upon the other side of the the paraffin bath, lowering the level of the upper
machine. The loose retention of the containers
within the carriers permits the para?in to reach
all surfaces of each container, both. the interior
and the exterior surfaces, and the slight move
surface of the bath resulting in a decreased time
of immersion, and raising of the level of the upper
surface resulting in an increased time of immer~>
ments which each container mayhave within
As each container emerges from the para?in
bath it is disposed with its closed bottom end up
permost, permitting the coating to flow out of the
interior of the container and off of its outside sur
faces. The lowermost surface of the container.
its carrier are suf?cient to insure the complete
and thorough coating of all the projecting ?bers.
10 It is highly important that these ?bers be coated
as, in the absence of such protective coating upon
a ?ber, it will absorb moisture from the air or
moisture with which it comes in direct contact
and'will transmit this moisture to the wall of
15 the container, thereby softening the same and
decreasing, its mechanical strength. It is, of
course, of equal importance that the air and
moisture between‘ the interstices of the paper
?ber of the container walls themselves be ex
20 pelled and :replaced by para?in. Complete im
pregnation of. the ?bers themselves by parai?n
is not desired, but thorough continuous coating
is essential.
With containers fabricated of paper such as
25 have been described, it has been found that an
immersion of substantially ten seconds produces
the desired effect upon the walls thereof, the air
and moisture being expelled and the projecting
?laments or ?bers being completely coated while
30 at the same time mechanical strength is main
tained. Longer immersion oftentimes results in
production -of containers of decreased strength
due to impregnation of the ?bers. When the
paper is immersed for approximately ten seconds,
35 as aforesaid, the temperature of the para?in is
preferably maintained at approximately 165
175° F. It will be appreciated that with dif
ferent weights and types of paper the time of im
mersion will'vary and also that the temperature
40 to which the para?in has been heated will have a
bearing. ‘In any case, the object will be to im
merse the paper for a sufficient time to insure that
its moisture'and air content is expelled, the pro
jecting ?bers thereof coated, and the interstices
.45 of the paper wall ?lled with paraffin. Continued
immersion after these results have been achieved
is detrimental.
'
_
For the purpose of maintaining the paraffin at
the desired temperature, suitable heating ele
ments are incorporated within the housing l0.
50
Such a heating element is indicated generally at
I00 and is seen to comprise a suitable tortuous
conduit through which steam or other heated
?uid may be passed. Gas heated or electrically
55 heated elements may, of course, be substituted
for that shown. Also, and for the purpose of
heating the upper portion of the mechanism en
closed within the housing, a second heating unit
m is provided, this unit in the present instance
60 also comprising a tortuous conduit for the circu
lation of steam. All parts of the conveyor, all of
sion.
.,
rests on a convex surface of the carrier so that
there is a comparatively small area of contact of
the container with the carrier, permitting the para?in to have maximum opportunity to escape 15
between the lower wall of the container and the
convex inner surface of the then bottom support
ing Wall of the carrier. The duration of the drain
ing of the containers may be approximately
eighteen seconds, but at any ratesuf?cientliy long 20
to permit the ‘flowing off of all free ?owing
para?in.
.
-
When a freshly immersed container reaches the
discharge position, in which position the carrier
in which it is housed occupies the'position indi 25
cated at D in Figure 1, its walls are substantially
free of excess paraffin, the draining operation‘
being substantially completed. A slight further
drainage occurs, however, after ejection of the
container from the carrier and during inversion 30.
of the container by the mechanism previously de
scribed and which is illustrated in Figure 6. Thus,
after the container has been again positioned
vertically ‘with closed end lowermost, as indicated
at C4 in Figure 6, there is a slight downward 35
drainage along the vertical walls and this para?in
when later solidi?ed, stiffens, reinforces and
renders entirely leakproof the bottom section of
the container, where the pressure of any liquid
later introduced is naturally the greatest.
' 40'
Having thus described the invention, what is
claimed as new and desired to be secured by Let
ters Patent is:
-1. An apparatus for coating tubular ?at sided
paper containers comprising a closed compart
45'
ment the lower portion of which constitutes a re
ceptacle for a bath of molten coating material,
heating means in said compartment above the
surface of the paraffin, for maintaining the tem
perature of the atmosphere within the compart
ment higher than that at which the coating ma
50'
terial solidi?es, an endless chain within the com
partmcnt and guided to have an elongated ver
tical reach, and article carriers mounted on the
chain and adapted to be submerged in the bath,
carriers emerging from the bath being carried
upwardly along said vertical reach of the chain
and through a heated atmosphere to a point of
discharge, whereby perfect drainage of the con
60
tainers is realized.
2. In 'a coating apparatus, in combination, a
the carriers, and in fact, all parts enclosed within ' carrier member substantially rectangular in
the housing, are maintained at all times at a transverse section and having an open side for
temperature above that of the melting point of
the introduction of articles to be retained there
paramn so that any paraffin which is carried up
wardly out of the bath upon the conveyors will
remain liquid and fall again to the bath without
by, the side wall opposite said opening having av 65
instance, the speed of the conveyor. Inasmuch
minor aperture for the insertion of apusher ele~
ment to eject any article within the carrier, and
a conveyor upon which‘ the carrier is mounted.
3. In a coating apparatus, in combination, a
carrier member comprising an elongated box-like
structure for the reception of a ?at walled tubular
as the coating unit may comprise a portion of a
container having opposed parallel flaps project
congealing and thereby clogging the machine.
The time of immersion of the containers may
be varied in various ways, as by regulating for
complete automatic machine, however, it is not
desirable to vary its operating speed and hence
75 the time of immersion of the containers may be
ing from one end thereof, said carrier having a
part projecting inwardly from one end wall there
of to engage a container intermediate the end
6
2,188,214
?aps thereof and thereby prevent the flaps from
engaging said end wall.
4. Coating apparatus comprising in combina
, tion, a receptacle for a bath of liquid coating ma
terial, an elongated boxlike carrier member polyg
onal in transverse section and adapted to en
velop and retain a container of similar polygonal
cross-section but having a slightly smaller cross
section than the carrier member so as to have
10 limited movement therein, said carrier member
being provided with apertures for the in?ow and
out?ow of liquid, and means for moving the car
rier member into, through and out of the bath.
5. Coating apparatus comprising, in combina
15 tion, a receptacle for a bath of liquid coating
material, an elongated box-like carrier member
polygonal in transverse section and adapted to
envelop and retain a container of similar but
smaller polygonal cross-section, said carrier be
20 ing open at one side and having means at its
ends to limit longitudinal movement of a con
tainer therein, and means for moving the car
rier member into, through and out of the bath.
6. In a coating apparatus, in combination, a
carrier member comprising an elongated box
like structure for the reception of a flat walled
tubular container, one wall having a convex inner
face upon which a container may rock when the
carrier member and container are immersed.
30
7. In an apparatus for coating elongated paper
containers, each having an open end and a
closed end, comprising a receptacle for a bath
of molten paraffin or the like, a casing above the
them with their major axes inclined to the ver
tical and passing them through said insertion ap
erture, a conveyor enclosed by the receptacle and
casing for receiving, whileso inclined, contain
ers successively inserted through said insertion 5
aperture, lowering them into the bath while so
inclined, lifting the coated containers from the
bath and presenting the same to the discharge
aperture, the conveyor being mounted for move
ment in a plane and having means to support 10
the containers received and carried thereby at
an angle to said plane, and means within the cas
ing for successively ejecting coated containers
through said discharge aperture.
9. The combination set forth in claim 8 in 15
which said mechanism includes means for receiv
ing containers with axes vertically disposed and
bottom end uppermost and revolving the con
tainer until the bottom end is lowermost.
10. The combination set forth in claim 8 in 20
which a device is positioned without the casing
and adjacent the container discharge port for
successively receiving containers and depositing
the same, bottom end lowermost, upon a con
tainer receiving element.
25
11. In a coating apparatus, in combination, a
receptacle for a bath of ?uid coating material, a
plurality of article carriers, each being construct
ed to retain a tubular ?at sided open ended paper
container with the axis of the container at all 30
times in substantial coincidence with the axis of
the carrier, and means upon which said carriers
are mounted and by which they are successively '
receptacle and having spaced apertures therein
35 for‘ the insertion and discharge of containers,
mechanism adjacent the container insertion
aperture for successively receiving containers, p0;
moved in a plane along the same endless path,
a portion of which path lies beneath,'and a por 35
sitioning them with their major axes inclined to
the vertical and passing them through said in
40 sertion aperture, and a conveyor enclosed by the
receptacle and casing for receiving, while so in
clined, containers successively inserted through
said insertion aperture, lowering them into the
posed that the tubular container carried therein
is inclined with its axis at an angle to the hori
zontal and inclined to the‘ plane of the endless 40
path in which the carriers are moving, whereby
all of its flat surfaces are angularly disposed
with respect to the surface of the bath during‘
bath while so inclined, lifting the coated con
the immersion thereof.
45 tainers from the bath and presenting the same
to the discharge aperture, the‘ conveyor being
mounted for movement in a plane and having
means to support the containers received and
carried thereby at an angle to said plane.
8. In an apparatus for coating elongated paper
50
containers, each having an open end and a closed
end, comprising a receptacle for a bath of molten
para?in or the like, a-casing above the- recep
tacle and having spaced apertures therein for
55 the insertion and discharge of containers, mech
anism adjacent the container insertion aperture
for successively receiving containers, positioning
tion above, the surface of the bath, each carrier,
when being lowered into the bath, being so dis- '
'
12. An apparatus for coating tubular ?at sided 45
paper containers comprising an endless chain,
guide means therefor whereby the chain is sup
ported for movement in a plane, a plurality of
box like open sided container carriers mounted
on the chain, each being so formed and so at
tached to the chain that a paper container sup 50
ported therein will have its flat sides disposed
angularly to the plane in which the chain is sup
ported, and stationary means for preventing
escape of containers from the carriers during a
portion of the travel of each carrier.
HENRY T. SCO'I'I‘.
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