[0001] This invention relates to a liquid container provided with a pour opening. The container
may be fashioned from a web of paperboard or from individual blanks, the paperboard
being provided with liquid impervious laminations.
[0002] The container is in the general form of a rectangular parallelepiped, commonly termed
a brick-type container, which can be formed from a paperboard web of indefinite length
or from individual blanks. At least one surface of the web, which is to be the inside
of the container, is laminated with liquid impervious materials such as polyethylene,
surlyn, and foil. Usually, however, both web surfaces are laminated.
[0003] The container of this invention is particularly adapted to hold and to dispense liquid
foodstuffs, such as milk fruit juices, and drinks. Containers of the type to which
this invention relates are often referred to as aseptic containers or packages, since
aseptic conditions (sterile atmosphere and the like) usually accompany the package
forming and package filling process or operation. The prior art is already aware of
this general type of container, as shown for example in U.S. Patent 3,347,444 to Rausing
and 3,232,514 to Swede. These packages, in larger sizes (1 liter and above) as well
as the package of this invention, is adapted for consumer use, i.e., use wherein the
consumer does not necessarily dispense the entire contents of the container in a single
pouring operation. Instead, a reclosure of the container is to be made for a subsequent
dispensing of a portion of the contents.
[0004] As exemplified by the Swede patent, brick-type packages are often formed with triangular
flap ears, known in this art as dog ears. The triangular flap ears are often positioned
with the base of the triangle of each ear coincident with the top and bottom edges
of the side walls or panels of the carton. The triangular flap ears generally extend
along the sides of the carton, being maintained in that position by a spot of an adhesive.
Sometimes the tabs may extend and lie on the top and bottom walls of the carton, also
maintained in that position by a spot of adhesive.
[0005] A variety of opening devices and pour spout devices has evolved in this art, such
devices facilitating successive openings and reclosings of the dispensing opening
or spout.
[0006] According to the practice of the present invention, a pour opening is provided in
the top wall of the container, the pour opening being die-cut, for example, and covered
on its outside surface with a peelable seal membrane. The die-cut has the polymers
extruded over the opening on the inside. The die-cut board edges around the perimeter
must be covered. A patch is sealed to these extrusions layers from the outside. The
pour opening is positioned adjacent to and at one side of one -of the triangular flaps
or dog ears. In use, the consumer initially peels off the flexible seal or otherwise
ruptures it, to thereby enable dispensing of the carton contents. Thereafter, assuming
that not all of the contents have poured out of the carton, the user bends back one
of the triangular tabs, being that tab closely associated or closely adjacent to the
pour opening such that the tip of the dog ear enters the opening and extends underneath
it, with the rigidity or stiffness of the dog ear maintaining it up against the interior
surface of the container. In this manner, contamination of the contents of the carton
is inhibited by blocking the pour opening with a portion of the triangular flap ear.
According to the invention, the pour opening may be provided on the top of the carton,
or on one of the sides, or be positioned underneath one of the triangular flap ears
at the top of the carton. In each case the opening is on any panel that does not have
a fin seal. The pour opening is so configured as to maximize its area of closure by
the triangular flap ear.
[0007] While the invention is illustrated in a brick type carton formed from a continuous
web of paperboard, it is not limited to such a carton construction; rather it is applicable
to aseptic packages of generally brick type or parallelepiped geometrical form, whether
formed from webs or individual blanks.
[0008] The full nature of the invention will be understood from the accompanying drawings
and the following description and claims. It should be understood, however, that references
in the following description to terms such as base, front, rear, and side wall members
are for convenience of description, and such terms are not necessarily intended to
be used in a limiting sense.
F I G . 1 is a perspective view of the top portion of a brick style container of this
invention in its filled and sealed state.
F I G . 2 is a view taken along section 2-2 of FIG. 1.
F I G . 3 is a view similar to FIG. 1 and illustrates the pour opening as it is being
uncovered by a peelable sealing membrane.
F I G . 4 is a view similar to FIG. 3, and illustrates how the dog ear or triangular
flap tab is bent back approximately 270° for the purpose of at least partially closing
the pour opening and thereby inhibiting contamination of the container contents.
F I G . 5 is a perspective view of another style brick-shaped container, having its
fin seal in a location other than as shown in the container illustrated in FIG. 1,
and showing the location of the pour opening feature of the invention herein.
F I G . 6 is a top view of another pour opening shape.
F I G . 7 is a top view of a third pour opening shape.
F I G . 8 is a top view of a fourth pour opening shape.
[0009] In Figures 1 and 5, the numeral 10 denotes generally a brick type package fashioned
from paperboard or other resilient, stiff and foldable material, the paperboard usually
being coated with one or more layers of an impervious substance such as polyethylene.
Aluminum foil and other resins are often employed. Such brick type packs may be formed
from a continuous web, the continuous web being suitably scored to facilitate its
folding into the brick type form with subsequent filling and closing of the container,
or from individual blanks. Such containers have a seam running along three of the
four side, top and bottom wall or panel portions. One such container is illustrated
in FIG. 1, and a second container, having a seam running along different wall panels
than the container of FIG. 1 is illustrated in FIG. 5. It will be understood, however,
that the manner of fashioning the brick type container and the location of the seam,
if any, is not material for the practice of this invention.
[0010] The numeral 12 denotes the top wall or panel of the container, the top wall provided
with a pour opening and seal assembly denoted generally by the numeral 14. The numeral
12 denotes the top wall or panel of the container, the top wall provided with a pour
opening and seal assembly denoted generally by the numeral 14. The numeral 16 denotes
one of the two side walls or panels, while the numeral 18 denotes the front wall or
panel. The numeral 22 of FIG. 1 denotes a seam running vertically and generally centrally
of side wall 16, with triangular flap half or dog ear 24 extending downwardly along
side panel 16 and affixed thereto as by a spot of a suitable adhesive. The tab 24
carries seam portion 26. Ear 24 is defined by a lateral continuation or extension
of top wall 12 as well as a vertical continuation of side wall 16, the tab being folded
into the illustrated triangular form in a manner which is conventional in the art.
[0011] Referring now to FIG. 2 of the drawings, the numeral 32 denotes a pour opening in
the paperboard substrate 34 from which the carton is fashioned. The opening may be
die-cut or may be formed in any other convenient manner. The numeral 36 denotes a
peelable layer of polyester/foil/heat seal coating. The numeral 34 denotes a layer
of S.B.S. paperboard. The interior of the carton, corresponding to the lower portion
of FIG. 2, includes layers 40, 42, 44 formed to surlyn/ foil/surlyn or low density
polyethylene, respectively.
[0012] Referring now to Figures 3 and 4 of the drawings, a description will now be offered
of the mode of use of the closure of this invention. The package 10, filled with,
for example, fruit juice or milk or other liquid foodstuff, is grasped and peelable
layer 36 removed. The remaining layers spanning aperture 32 are removed, as by rupturing
or tearing, to thereby expose and open hole 32. This is illustrated at FIG. 3. Next,
the contents of the container are partially dispensed. The carton is now ready for
storage until the next partial dispensing of the contents. At this time, dog ear or
triangular flap ear 24 is pulled away from its adhesive fastening to side wall 16,
rotated approximately 270°, with the tip of ear 24 now being inserted into hole 32.
The resultant configuration of the container is illustrated at FIG. 4 and it will
be observed that aperture 32 is very nearly closed, thereby inhibiting contamination
of the contents of the container during storage.
[0013] As previously mentioned, the pour opening may be provided on the top of the carton,
or on one of the sides, or be pcsitioned underneath one of the triangular flap ears
at the top of the carton. In each case the opening is on any panel that does not have
a fin seal. Moreover, the pour opening is so configured as to maximize its area of
closure by the triangular flap ear. For example, as illustrated in FIG. 6, 7, and
8, the pour opening may be triangular, circular, or oval in shape.
[0014] The prior art is aware of somewhat similar constructions. For example, U.S. Patent
1,437,511 to Gereke shows a folding carton with a die-cut tab that goes into a slot
for reclosing. Pouring of the contents is accomplished by bowing the sidewall, creating
a pour spout. The present invention requires the puncturing of barrier laminations
under a die-cut liquid pour opening or the removal of a barrier heat-sealed patches.
The pour opening acts as the reclosure lock by snapping the pre-formed heat-seal extension
(dog ear) into the trailing edge of the opening. U.S. Patent 2,861,732 to Parker discloses
a pre-scored pour spout similar to a milk container design. The point of the spout
snaps into a die-cut slot. In the present invention, die-cut slots, spouts or extended
flaps are not employed. Instead, pouring is accomplished through a die-cut opening
that is covered by a barrier extrusion or coatings barrier sealed patches which eliminate
the need to form a spout. The only similarity to the prior art is that the point of
the spout is held down by a slot in the-top panel. U.S. Patent 2,946,496 to Stagmeier
is similar to the Gereke patent in that it uses glue flaps, perforations, slots and
tabs to develop an opening and reclosing feature. In this construction, glue is for
sealing and perforations do not have to be torn away. U.S. Patent 3,226,003 to Hickin
is similar to the Stagmeier patent in that an opening and closing feature is created
using normal folding carton techniques. U.S. Patent 3,232,514 to Swede, which discloses
an aseptic package for liquids, also shows an opening and closing concept that uses
perforations that must be torn. This type of tear opening is difficult to accomplish
as a practical matter because the polymeric extrusion layers on the board do not tear
easily.
[0015] Generally speaking, the present invention is directed to a liquid impermeable carton
for and of stiff resilient, and foldable material, such as paperboard, the carton
being in the form of a rectangular parallelepiped having a front wall, a rear wall,
two side walls, a bottom wall, a top wall, and a triangular flap ear at least at the
top of one side wall edge and whose base is at the edge. The triangular flap ear is
normally folded and lies against a carton wall. The improvement comprises a pour opening
in a wall, the pour opening being adjacent to one side of the base of the triangular
flap ear. The pour opening is normally covered by a seal, which is opened upon initial
partial dispensing of the container contents. The container is adapted to be filled
with a liquid foodstuff such as milk or fruit juice, whereby after rupturing the seal
and dispensing a portion of the container contents, the triangular flap ear is bent,
and its tip is inserted into the pour opening to inhibit contamination of the container
contents.
[0016] Although the invention has been described above by reference to a preferred embodiment,
it will be appreciated that other constructions may be devised, which are, nevertheless,
within the scope and spirit of the invention and are defined by the claims appended
hereto.
1. A liquid impermeable carton formed of stiff, resilient and foldable material, such
as paperboard, the carton being in the form of a rectangular parallelepiped having
a front and rear wall (18), two side walls (16), a bottom wall and a top wall(12),
a triangular flap ear (24) at least at the top of one side wall edge and whose base
is at said edge, the triangular flap ear being normally folded and lying against a
carton wall, the improvement comprising, a pour opening (32) in a wall, the pour opening
being adjacent to one side of the base of the triangular flap ear (24), the pour opening
normally being covered by a seal (36) which is opened upon initial partial dispensing
of the container contents, the container being adapted to be filled with a liquid
foodstuff such as milk or fruit juice, whereby after rupturing the seal and dispensing
a portion of the container contents the triangular flap ear is bent and its tip inserted
into the pour opening to inhibit contamination of the container contents.
2. The carton of claim 1 wherein the seal (36) includes a peelable covering extending
across the pour opening (32) and normally covering it.
3. The carton of claim 1 wherein the pour opening (32) is located on the carton top
wall (12) and wherein the triangular flap ear (24) is positioned along a side wall
(16).
4. The carton of claim 1 wherein the pour opening (32) is located on a side wall (16)
and wherein the triangular flap ear (24) is positioned along the carton top (12).
5. The carton of claim 1 wherein the pour opening (32) is positioned beneath the triangular
flap ear (24).
6. The carton of claim 1 wherein the carton (10) is formed from a one piece blank.
7. The carton of claim 3 wherein a side seam (22) runs along that side of the carton
against which said triangular flap ear (24) is normally positioned.