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Dec. 3, 1946.
_ '
I F‘iled June 5, 1944
Samuel? Bsnsga?sk
-' ‘2,412,031
Patented Dec. 3, 1946
Samuel Bergstein, Cincinnati. Ohio, assignor to ’
Robert Morris Bergstein and Frank David
Bergstein, trustees
Application June 5, 1944, Serial No. 538,764 ~
7 Claims. (01. 229-37)
My invention relates to cartons designed to be
proofed or sealed by immersing them in proof
ing agents._ Such cartons are used for the pack
aging of milk, dairy products, frozen foods, and
There has been a marked commercial
growth in recent years in the use of/dlpping proc- ,
the like.
erence is made to the accompanying drawing
Figure 1 is a partial‘ plan view of a paperboard
blank for a carton embodying my invention.
' Figure 2 is a partial perspective view showing
a stage in the formation of van end closure.
Figure 3' is a partial perspective view showing
esses for paperboard containers in the packag
a later stage thereof.
ing industry, employing a variety of ?uid seal
Figure 4 is a partial sectional view taken across
ing mediums including molten para?in wax, wax
the carton end closure after immersion in the
and rubber mixtures, and. other sealing and 10
proo?ng substances, to all of which my present
I have'discovered that by providing a seal-end
invention pertains. The cartons are provided on
carton blank wherein the edges of an underly
one end at least with closure ?aps, which are
ing sealing flap are ‘recessed, ‘I provide a struc
folded over and adhesively secured. In some in
which, when sealed, is characterized by a
stances, the carton is provided with similar flaps
at both ends and is ?lled and closed; after which
crevice along opposite edges of the closure, where
by when such a, carton is dipped‘ or immersed
in the sealing medium, an excess or surplus oi
the entire carton is dipped in a bath of the proof
ing and sealing substance. In other instances,
the medium is retained in the crevice. .
as in milk bottles, the carton is erected, closed
When a so-called “seal-end" carton is closed
at one end as described, and then passed through
and adhesively secured, an intermediate ?ap lies
a bath of the proo?ng and sealing substance.
above a pair of shorter'?aps and is covered by
Afterward, it is ?lled, and then closed at the top
an outer flap. The intermediate .;'and outer ?aps
by suitable closure means.
Both types of procedure and both types of car
ton present essentially the same problem.
each, at one or both ends, there is a closure
formed by adhesively secured ?aps lying in face
to-face relationship, with certain of the ?aps
present cut edges at opposite sldesfof the closure,
The adhesive used in re- .
25 which are coterminous.
taining the ?aps in their closed positions is not
relied upon to effect a seal. When the carton‘
is dipped, there may be formed a very thin skin
or coating, overlying'the cut edges of the board»
presenting free or cut surfaces along'opposite side
edges of the closure. It is at these places that
the greatest weakness in such packages is en
countered. A slight imperfection in the coating
and the bent edges of the underlying ?aps, which
will make, the structure initially liquid tight.
elsewhere, as on a wall surface, or rupture or
There is little or no penetration of the sealing
medium between the layers oi.’ board at the side
abrasion of the sealing medium on a wall surface
due to handling and shipping, does not neces
sarily weaken or rapidly destroy the effective
ness of the package itself‘. But the slightest im
perfection or rupture of the coating along the
free edges of the ?aps at the end of a container
The slightest rupture of this thin skin, however,
destroys the ‘sealed character of the container.
edges of the closure, and such penetration as
there is cannot usually be relied upon. ‘
However, if the edges of the intermediate ?ap
are cut away 'or recessed, there is presented, be
tween the outer ?ap and the inner ?aps, a recess‘
starts leakage and loss of e?ectiveness almost 40 having a width at least as great as the thickness
' of a layer of board. The sealing medium collects
The principal object of my invention is the
provision of means for overcoming this weakness
and providing along the edges of the closure not
only a tight and dependable seal, but a seal oi
such strength and resistance as to minimize ‘dam
age in handling and shipping. It is my object
to accomplish this in a simple. and inexpensive
These and other objects of my invention, which
will be set forth hereinafter or will be apparent
to one skilled in the art upon reading these speci
in this recess directly bridging the gap between
the outer ?ap and the inner ?ap, uniting them
together in sealed relationship. The thickness
of the sealing medium/in this recess is su?lcient to
give the seal strength and resistance to handling
and scu?lng so that the abrasions normally ex
pected duringuse cannot destroy the seal. The
seal has none of the characteristics of a thin
skin, but rather possesses the characteristics of
a solid plug.
It is not, however, preferred'to recess or cut
?cations, I accomplish by that certain construc
back the edges of the intermediate ?ap through
tion and arrangement of parts, of which I shall
out the entire length of these edges. This would
now describev an exemplary embodiment. Re! 65
pressure on both sides of the closure to insure A
proper setting of the adhesive, and aconformity
be likely to leave minute. openings at the corners
of the closure where the ?rst folded ?aps might
not accurately contact adjoining walls. A very
?uid sealing‘ medium might run through these
cracks, entering the interior of the container in
undesired amounts.
ofthe ?aps which is as complete as possible.
The carton, having been closed on one end as ,
described, may then be bodily‘ immersed in a bath
of proo?ng and sealing substance. Or, if the
‘carton is of a type having the illustrated closure
at eachrend, it may then be ‘inverted-?lled, with
As a consequence, I prefer
to relieve the opposite edges of the intermediate
-?ap between the extreme ends thereof, leaving '
these extreme ends of full width.
, '
Referring to Figure 1,.I have shown a flat, out
- the desired contents, and similarly closed-'andi'ad
hesively secured on the opposite. end, after which
.it will be’dipped in a bath of proo?ng substance.
{While I have mentioned dipping, itwill be under
l0 '
and creased paperboard carton blank comprising
main body panels -I, 2, 3 and l and a glue flap 5
stood that this is the normal procedure; but that
articulated together by longitudinal score lines
other modes of applying the p'roo?ng and sealing
in the usual fashion.‘ Closure?aps are articu
lated by a common score line .to the ends of the 15 substance may be employed without departing
1 from the spirit of my invention, such for example,
body walls. A pair of closure ?aps. 6 and 1, are
as painting, spraying, or otherwise ‘applying the
short ?aps, articulated to opposite walls I and 3.
coating agent or, in the instance of cartons made _
An intermediate [flap 8 is articulated to the body
of proofed boards, immersion of theends thereof
wall 2, while an outer flap 9 is articulated to the
as distinguished from complete submergence in’
body wall 4. The ?ap 9 is of full dimensions to
a bath.
~extend entirely across the end of the carton.
Figure‘ 4 is a semi-diagrammatic cross-section
‘ [The ?ap 8 is similarly dimensioned in general;
a1 view of the carton showing the closureand the],
but its side edges are recessed, as shown at l0‘ and
effect of dipping it into a‘ bath of- proo?ng sub
_ ll, not, however, for the full length of these side
edges. , Adjacent the articulation of flap 8 to wall 25 stance, or otherwise applying thé ‘substance as
2., there are full width portions 12 and I3 of minor
extent, and similar full width portions l4 and i5
occur adjacent the outer end of the flap.
described. The
by ?aps
the intermediate
6 andv ‘I lie vin?ap
a single
8 and
the ‘
outer‘flap 9, all of these flaps lying parallel and
The blank shown in Figure 1 is not complete
in face-to-face relationship; but it will be seen
and has been shown with one closure only. The 30 that the edges of the intermediate flap 8 are >
spaced inwardly of the corresponding‘edges' of
vother end of thebody may be provided with an
the overlying ?ap 9 and the upper ends of the
exactly similar closure, where the carton is to be '
?lled‘and closed and then dipped bodily in the . body walls of the carton, leaving, recesses. ‘The
formation of the external coating iii of proo?ng
sealing bath. Where the carton is to be closed
on one end only and then dipped, the other end 35 substance results in the introduction of the sub
may be provided with any desired type of closure
stance into the recesses, as shown in Figure 4 at
appropriate to the uses to which the carton is to
be put. The size and cross-sectional shape of the
H not
i8. Itso
as to
that or
it -" »
carton form no limitation upon my invention nor
does the number of enclosing body walls pos 40 ?lled. Hence, as distinguished from the forma:
sessed by the carton, since it will be clear to one
tion of a comparatively thin skinof sealingss
skilled in the art upon reading these speci?ca
of the board
over superposed
at the opposite
and coterminous
sides of theout
‘edges, ; ,
tions how the teachings hereof may be applied
to cartons of other polygonal cross-section.
with uncertain
between the
board layers,'in
of the my
a ,1‘
The paperboard blank of Figure 1 is tubed in 45 stance
the ordinary way on the ordinary carton tubing
heavy deposit of sealing substance at I1 and“! _
devices by being bent on a pair of intermediate
?lls a de?nite recess in the structure anddirectly
score lines, glue or other suitable adhesive being
joins the outer ?ap 9 with the ends of the ‘body I ‘
applied to the meeting surfaces of wall I and glue
walls and immediately adjacent portions of the
flap 5, and these being adhered together, as will
short flaps 6 and 1.. These masses of sealing sub
be ‘readily understood. The glue ?ap 5 may be
stance are quite strong; andlthe bond, and:_con
sequently the seal, is not liable to destruction
adhered either inside or outside the wall I. The
blank may initially be made of proofed board if
under ordinary handling strains.
desired; but this is not necessary for most pur
Yet, the formation of my seal is a matter’ of] _
poses in view of the immersion treatment to 55 negligible expense. It requires only a slight mod: which it will be subjected. The tubed blank is
blanks are
of cut
very slight
the carton‘
addi- 1 .
shipped'in the flap or collapsed form to the pur-_
tional quantity of sealing substance in' there
The user squares up‘ the tubular body of the
cesses, as at H and I8. ‘ The physical operations
blank and effects a closure. The ?rststage of 60 of closure and immersion are not altered ashsuch, v i
‘this closure is illustrated in Figure 2 where the
and ‘may be performed either by hand or on
' short ?aps 6 and ‘I have first been folded in.- Glue
orother adhesive may be applied to ?aps 6 and 1
standard and available equipment. '
Modi?cations maybe made in my‘ invention
without departing from the spirit of it. ‘Having, '
if desired, and preferably will be so applied.
A next stage is shown in Figure 3 where the in?‘ 65 thus described my invention in an exemplary em;
termediate flap 8 has been folded over upon and
bodiment, what I claim as new and desire to se
preferably adhered to the short ?aps 6 and 1.
cure by Letters'Patent is:
> ~
1. A carton blank having enclosingbody walls I
Finally, the outer flap 9 will be‘ folded over upon‘
the intermediate flap 8 with the interposition of
in articulation and end closure ?aps articulated
adhesive between’ their meeting surfaces.» The 70 to said body walls, said end closure ?aps adapted
to be folded in sequence to form a plural layered-jv
closure may be effected in any way desired; and
there are machines'available for the purposev
in which
and adhesive
the flapsunion,
lie inone
of‘ said ?aps,
en?v }
which requires no description here. The closure
may, if desired, be accomplished over a mandrel,
being an outer ?ap dimensioned to covertlievenif; v
and preferably there will be means for exerting 75 tire end cross-section of said ‘body; another off.
said closure ?aps being an intermediate ?ap sim-'
ilarly dimensioned to cover the entire end cross
section of said carton‘ body, excepting that edge
portions thereof where exposed in the closure
are slightly recessed so as to extend inwardly of
the corresponding edges of the outer flap to form
recesses in said closure adapted to be ?lled with
sealing substance.
flap is con?ned to intermediate portions thereof,
end portions of said edges being of full width,
said carton body having at its opposite end a sim
ilar series of closure ?aps. _
6. A sealed carton comprising enclosing body
walls in articulation and an end closure compris
ing flaps articulated to said body walls and ad
hered in face-to-face engagement, intermediate
and outer ones of said flaps dimensioned to cover
the end of said carton, said intermediate flap
the recessed edges of said intermediate. ?ap have
having edge portions thereof recessed inwardly of
at the ends one or more of said edge portions of
corresponding edges of the outer ?ap, and a coat
substantially full dimension so as to be cotermi
ing of sealing substance on said carton covering
2. The structure claimed in claim 1, wherein
nous with adjacent portions of the outer ?ap at
at least opposite edge ‘portions of said closure
corners of the closed carton body.
and enteringsaid recesses whereby to seal edge
3. A blank for a paperboard carton scalable 15 portions of said outer ?ap directly to inner ?aps
by immersion or the like, said blank comprising
past the recessed edges of said intermediate ?ap. ‘
a body portion having four walls and a glue ?ap
7. A sealed carton comprising enclosing body
in articulation and an end closure comprising
walls in articulation and an end closure compris
closing ?aps, an opposite pair of said ?aps being
ing ?aps articulated to said body walls and ad
short enough in length to lie in the same plane 20' hered in face-to-face engagement, intermediate
across an end of the carton formed from said
and outer ones of said ?aps dimensioned to cover
blank, another flap, adapted to overlie said ?rst
the end or’ said carton, said intermediate ?ap
mentioned ?aps, being dimensioned to cover the
having edgerportions thereof recessed inwardly of
entire cross section of the end of said carton ex
corresponding edges of the Outer ?ap, and a coat
cepting that its' side edges are slightly recessed, 25 ing of sealing substance on said carton covering
and a fourth ?ap adapted to overlie the last men
at least opposite edge portions of said closure and
tioned ?ap and dimensioned to cover the entire
entering said recesses whereby to seal edge por-i
cross section of the end of said carton.
' tions of said outer flap directly to inner ?aps past
4. The structure claimed in claim 3, wherein
the recessed edges of said intermediate flap, the
the recessing of the edges of the third mentioned 30 said recessed edges of said intermediate flap hav
flap is con?ned to intermediate portions thereof, 7 ing portions at their corners‘of full width.
end portions of said edges being of full width.
5. The structure. claimed in claim 3, wherein
the recessing of the edges of the third mentioned
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