[0001] The present invention concerns the field of cardboard packaging and in particular
it concerns a container provided with at least one conical, truncated cone-shaped
or truncated pyramid-shaped portion provided with an improved opening system.
[0002] The invention further concerns a process and a machine for making the above opening
system.
[0003] Cardboard containers and in particular cardboard containers having a truncated conical
shape, such as, for example, those used for packaging panettone, pandoro and similar
products, currently have a knock-out opening system disposed on the bottom.
[0004] In detail, said systems have lines of weakness or pre-cutting which define a removable
portion of said container, removal of which forms a sufficiently large opening in
the package to allow access to the contents of the container for removal thereof.
[0005] In this case opening is very awkward in that the container must be turned upside
down.
[0006] Alternatively, the lines of weakness or pre-breaking define a strip of cardboard,
removal of which allows the container to be divided into two parts, usually a top
and a bottom part.
[0007] The removable portion or dividing strip therefore has a protruding tab or strip,
connected to the lines of weakness, on which the consumer acts by pulling to cause
removal of the above portion.
[0008] During tear-off removal of the removable portion or the dividing strip, it is possible
for tearing of the carton not to proceed along the lines of weakness, but to proceed
in a direction of its own, especially as the distance between the point of application
of the pulling force (tongue) and the point instantly affected by the tear increases.
[0009] In this case, a smaller tear than necessary in the removable portion or premature
breaking of the separating strip can occur; in both cases it is necessary to intervene
on the container again to be able to access the content thereof.
[0010] Furthermore, provision of the tear-off strip makes the shape of the container more
complex and therefore requires more costly cardboards.
[0011] The object of the present invention is to solve the problems of the prior art by
proposing a container provided with an improved opening system that allows opening
thereof in any condition.
[0012] Another object of the present invention is to provide an improved opening system
that is simple and intuitive for any user to use and allows the product to be presented
upright, ready for use on the supporting base.
[0013] Yet another object of the present invention is to provide such an opening system
that is cheap to make and reliable.
[0014] Another object of the present invention is to provide a machine to produce such an
opening system that is cheap and simple to make.
[0015] The container according to the invention has the characteristics claimed in appended
independent claim 1.
[0016] Advantageous embodiments of the container according to the invention are apparent
from dependent claims 2 to 6.
[0017] The machine for making the opening system according to the invention has the characteristics
of appended independent claim 8.
[0018] Advantageous embodiments of said machine are apparent from the dependent claims.
[0019] Essentially, the container according to the invention has a truncated cone or truncated
pyramid shape comprising a side wall closed at the bottom by a base and at the top
by a lid and is provided on the inside with a single adhesive tape of plastic material
applied to a perimeter thereof and constrained to a pull tab cut in the cardboard
of said side wall, so that pulling on said tab causes guided tearing of a strip of
said side wall with a width substantially corresponding to the width of said inner
tape.
[0020] The machine for applying the tape of plastic material to a blank shaped as a section
of circular crown forming said side wall of the container substantially comprises
an application head for said tape that can be moved along a circular path to apply
said tape, by means of a presser member, to said blank along a portion of circumference
parallel to the portions of circumference of the section of circular crown of which
said blank is made up.
[0021] Further objects and advantages of the present invention will be made clearer following
the present description made purely by way of non-limiting illustration with reference
to the attached drawings, in which:
- Figure 1 is an axonometric top view of a container for panettone or pandoro according
to the present invention, with a cup-shaped bottom;
- Figure 1a is an axonometric bottom view of a container for panettone or pandoro according
to the present invention, with a recessed bottom;
- Figure 2 is a view like that of Figure 1, showing the container in the opening stage;
- Figure 3 is a development of the truncated cone-shaped side surface of the container
of Figure 1 or 1a, seen from the outside;
- Figure 4 is a development of the truncated cone-shaped surface of the container of
Figure 1 or 1a, seen from the inside;
- Figure 5 is a diagrammatic plan view of the machine for making the opening system
according to the present invention; and
- Figure 6 is a diagrammatic view of the portion of machine visible from the arrow A
of Figure 5.
[0022] In Figures 1, 1a and 2 a cardboard container 1 particularly for leavened products
such as panettone, pandoro and the like according to the present invention is illustrated.
[0023] The term cardboard, used in the present description, must be understood in the broad
sense and also comprises multiply materials having at least one cardboard layer.
[0024] The container 1 has a truncated cone-shaped or truncated pyramid-shaped side wall
2, closed at the bottom by a base 3 and at the top by a lid 4.
[0025] The base 3 can have a tray shape which protrudes at the bottom from the side wall
2 of the container (Figure 1), as illustrated in the figures, or can have a flat shape
and be recessed into the side wall 2 (Figure 1a). It is fixed by gluing or bonding
(welding) to the side wall 2 by means of an edge folded to the inside thereof, in
a per se known manner. In a likewise known manner, the lid 4 can be made from the
same blank as the side wall 2, or from a separate blank, as in the embodiment shown
in the appended figures.
[0026] During assembly of the container, the lid 4 is fixed by gluing or bonding, to the
truncated cone-shaped side wall 2. The side wall 2 is made from a blank 23, which,
developed in plan view, as shown in Figures 3 and 4, is shaped as a sector of circular
crown and is provided, at one end thereof, with a flap 40 defined by a scored line
5. The flap 40, during assembly of the container 1, is superimposed on the other end
of the blank 23 and glued or bonded thereon to bring the blank 23 to its truncated
cone-shaped condition.
[0027] In the bottom part, the truncated cone-shaped side wall 2 has an improved opening
system according to the present invention.
[0028] Said opening system consists of a thin tape 6 of plastic material, sufficiently strong,
adhesive on only on side, which is applied firmly to the truncated cone-shaped wall
2 of the container 1 so as to encompass the entire circumference thereof.
[0029] Thanks to its adhesive side, the tape 6 is made to adhere by gluing to the truncated
cone-shaped portion 2.
[0030] Suitable tapes for the present invention are polyester or polypropylene tapes which
have a width in the range of 1 to 4 mm. The tape 6 preferably has a width of about
3 mm.
[0031] The crosswise measurement of the tape 6, that is to say its width, is chosen within
the above range to give a good mechanical strength thereto and allow application thereof
to the cardboard of the container following a curved path substantially without folds
or creases.
[0032] The tape 6 is disposed at a fixed distance from the lower edge of the truncated cone-shaped
side wall so as to run along the entire length thereof. At the end, opposite said
flap 40, the tape 6 is connected to a tab 7 made on the blank 23 of the truncated
cone-shaped wall 2 of the container. The tab 7 which protrudes slightly from the blank
23 is defined by two curved side incisions or cuts 70 made on the blank 23, and represents
a gripping means for the user.
[0033] The user, by acting on the tab 7, and in particular by pulling it perpendicularly
and away from the side surface of the truncated cone-shaped wall 2, causes a "scissor
effect". In other words, as can be seen in Figure 2, a guided tear is caused in the
truncated cone-shaped wall.
[0034] In particular, a cardboard strip 8 whereon the tape 6 of plastic material is applied
is removed by tearing from the truncated cone-shaped wall 2. The removed strip 8 has
substantially the same width as the tape 6 of plastic material.
[0035] The tearing with consequent removal of the strip of cardboard 8 continues until the
tape of plastic material has run along the entire circumference of the truncated cone-shaped
side wall 2 whereon it is applied, causing separation of the top part and of the bottom
part of the container 1.
[0036] Of course, the tear can be stopped before the occurrence of complete detachment of
said two parts of the container, which remain attached for a portion, but in any case
determining such an opening as to allow the product to be removed from beneath. In
this case the container can be closed again in the event of partial consumption of
the product.
[0037] According to an alternative embodiment, not shown, the blank 23 could advantageously
have two parallel lines of weakness coinciding with the area of application of the
tape 6. In particular, it could have an upper and a lower line of weakness which run
along the entire circumference of the truncated cone-shaped wall and are placed at
a reciprocal distance substantially equal to the width of the tape 6. In this case,
the tape 6 is applied to the truncated cone-shaped wall between the two lines of weakness.
Application of the single adhesive tape 6 to the truncated cone-shaped wall 2, that
is along a curve, which represents the essential characteristic of the opening system
of the container according to the invention, is not a simple operation.
[0038] For this purpose, a special machine which also forms the subject matter of the present
invention has been designed.
[0039] The machine for performing application of the tape 6, shown diagrammatically in Figure
5, comprises an unwinding reel 9 for the adhesive tape 6 and a series of rollers 10
for conveying and aligning the tape, made of Teflon® to reduce friction with the adhesive
side of the tape 6. Downstream of the conveying rollers there is a straightening guide
10, able to rotate the orientation of the tape 6 by 90°, to send it to idle roller
50, also of Teflon®, which deflects the path thereof by 90°.
[0040] Downstream of the roller 50 there is provided a second straightening guide 11', which
sends the tape to a series of guide rollers 19, 21, with horizontal axes, two of which
21 are dancing rollers, to keep the tape always at the right tension.
[0041] Downstream of the guide rollers 19, 21, the tape 6 undergoes a further rotation around
its direction of travel by means of a straightening guide 13, to be sent to a second
idle roller 14 which returns it, through a third idle roller 51 and a further straightening
guide 52, to an application head 12, wherein means are disposed for drawing of the
tape 6 and application thereof to the blank 23.
[0042] The application head 12 is carried by a rocking arm 16 hinged around a centre of
rotation coinciding with the axis of the roller 14 and moved in rotation by an actuator,
such as a cylinder-piston assembly 15. The free end of the arm 16, which during the
stroke of the arm describes an arc of circumference equal to the curved path of application
of the tape 6, has a pressure element responsible, during the stroke of the arm 16,
for adhesion of the tape 6 to the blank 23.
[0043] The blank 23, in the open condition, that is to say in the condition shown in Figures
3 and 4, is brought level with the application head 12 of the tape 6 by means of a
step by step conveyor chain 20 and is drawn by means of a pair of pusher nibs 18.
[0044] The blank 23, coming from a special store, not shown, is disposed on the conveyor
chain 20 transversally to the direction of travel F, as shown in Figure 5.
[0045] The conveyor chain 20 is disposed so that the midline thereof passes through the
centre of rotation 14 of the rocking arm 16.
[0046] The cylinder-piston assembly 15 and the conveyor chain 20 are synchronised so that
the latter stops for the time necessary for application of the tape 6, when the blank
23 arrives under the application head 12.
[0047] Many modifications and variants can be made to the aforesaid machine without departing
from the scope of protection thereof. By way of example, it would be possible to keep
the application head 12 fixed and provide for rotation of the blank 23 around a centre
of rotation coinciding with the centre of the circle to which the sector of circular
crown forming the blank 23 belongs, so that the presser element of the application
head 12 likewise exerts its function, that is to say makes the tape 6 adhere to the
blank 23 along a curved path.
[0048] Downstream of the application machine 12, there may be a system for collecting the
blanks and assembling the container.
[0049] The invention is not limited to the particular embodiment described previously and
illustrated in the appended drawings, but numerous modifications of detail within
the reach of a person skilled in the art can be made thereto, without thereby departing
from the scope of said invention, as set forth by the appended claims.
1. A cardboard container for confectionery products, in particular leavened products,
such as panettone, pandoro and the like, having a truncated cone-shaped or truncated
pyramid-shaped side wall (2) closed at the bottom by a base (3) and at the top by
a lid (4), characterised in that on the inside of said side wall (2) there is applied a tape of plastic material (6),
encompassing at least one portion of the perimeter of said side portion and which
can be gripped at one end by means of a pull tab (7) cut in said side portion (2),
so that by pulling said pull tab (7) guided tearing of a strip of cardboard (8) of
said side portion (2), encompassed on the inside by said tape (6), is caused.
2. A container according to claim 1, characterised in that said tape (6) of plastic material is applied to the lower part of said side wall
(2) and encompasses the entire inside perimeter thereof, at the height at which it
is disposed.
3. A container according to claim 1 or 2, characterised in that said tape (6) has a width comprised between 1 and 4 mm, advantageously 3 mm.
4. A container according to any one of the preceding claims, characterised in that said tape (6) is adhesive on only one side and is applied to said side wall (2) on
the inside by gluing.
5. A container according to any one of the preceding claims, characterised in that said tape (6) is delimited by at least one line of weakness of said side wall (2),
running along a respective edge thereof.
6. A container according to any one of the preceding claims, wherein said tape of plastic
material (6) is disposed on a blank (23) forming said side wall (2), shaped as a sector
of circular crown.
7. An opening system for containers (1) of the truncated cone-shaped or truncated pyramid-shaped
type, comprising a side wall (2) closed at the bottom by a base (3) and at the top
by a lid (4), characterised in that said opening system consists of a single adhesive tape (6) of plastic material, applied
to said side wall (2) on the inside, encompassing the respective perimeter entirely
or partially at the height at which it is disposed, and having one end constrained
to a pull tab (7) cut in the cardboard of said side wall (2), so that by pulling said
tab (7) guided tearing of a strip (8) of cardboard of said side wall (2) of a width
substantially corresponding to that of said tape (6) is caused, and hence opening
of the container (1).
8. A machine for application of a single adhesive tape 6 to the truncated cone-shaped
side wall (2), in the form of a blank (23), of a container 1 according to any one
of claims 1 to 6, comprising means of feeding said tape (6) in web form to an application
head (12), means of feeding said blanks (23) step by step, so as to prepare them sequentially
beneath said application head (12), means of causing a relative rotation along an
arc of circumference between said blank (23) and said application head (12), so that
during said rotation a presser member of the application head (12) causes adhesion
of said adhesive tape (6) along the corresponding portion of circumference of the
blank (23).
9. A machine according to claim 8, wherein said feeding means for the tape (6) comprise
an unwinding reel (9), a series of tape conveying and aligning rollers (10), a series
of guide rollers (19, 21), idle rollers (50, 14, 51), straightening guides (11, 11',
13, 52), able to rotate the orientation of the tape (6) by 90°, as well as drawing
means for the tape (6) disposed in said application head (12).
10. A machine according to claim 8 or 9, characterised in that said tape application head (12) is mounted on a rocking arm (16) hinged in the centre
of the circle to which the sector of circular crown of said blank (23) belongs when
it is in the tape application position, so that rocking of said arm (16) causes application
of the tape (6) along said arc of circumference.
11. A machine according to claim 10, characterised in that said rocking arm (16) is driven by an actuator, such as a cylinder-piston assembly
(15).
12. A machine according to claim 8, wherein said feeding means for the blanks (23) comprise
a step by step conveyor chain (20), bearing, at regular distances, pairs of pusher
nibs (18) for said blanks (23).
13. A method of applying a single adhesive tape (6) to cardboard blanks (23) in the form
of sectors of a circular crown, forming the side wall (2) of a container (1) according
to any one of claims 1 to 6, comprising the following stages:
- picking up of each blank (23) from a store and positioning thereof on a conveyor
chain (20);
- step by step feeding of the blank (23) to position it under a head (12) for application
of said single adhesive tape (6);
- driving of said application head (12) along a circular path such as to apply the
tape (6) to the blank (23) along an arc of circumference parallel to the arcs of circumference
delimiting said sector of circular crown forming the blank (23).