[0001] The present invention relates to a container of sheet material, preferably paper,
for foodstuffs, in particular for products such as pastries, small cakes and the like,
of the type consisting of a portion of a flexible sheet material defined by a substantially
flat bottom wall and a side wall emerging from said bottom wall, said bottom wall
and side wall forming a cavity having an upwardly-facing opening under a situation
of normal use of the container, said side wall having a border at the top that defines
the contour of said cavity opening.
[0002] It is known that containers of paper material for foodstuffs, in particular confectionery
products of reduced sizes such as pastries and the like, known in the art under the
name of "bun cases", generally consist of a single portion of paper material, of circular
shape for example, obtained by cutting-off, and suitably shaped so as to form a flat
bottom wall and a tapering side wall of truncated conical form to promote formation
of packages and containers suitable for stacking.
[0003] The bottom wall and side wall form a cavity having an upwardly-facing opening in
the position of normal use of the container. In addition, the side wall is usually
made up of a pleating consisting of pleats and undulations disposed in a substantially
vertical extension direction, i.e. a direction corresponding to the apothem of the
frustum of cone and defining an indented upper border.
[0004] Generally bun cases are obtained starting from a flat sheet of paper material of
suitable sizes which is drawn by means of male-female moulds capable of producing
the flat bottom wall as well as the corresponding pleating on the side wall.
[0005] Following the drawing operation, a slight spring back of the paper defining the side
wall makes the container take its final frusto-conical shape.
[0006] In particular, looking at a section taken in a plane perpendicular to the bottom
wall, it is possible to see that in these containers of known type there is a side
wall defined by a rectilinear strip which is radius-joined to the bottom wall.
[0007] As a matter of fact, the above described containers involving reduced costs and easy
accomplishment, are commercially widespread and have been on the market for more than
90 years with a substantially unchanged shape.
[0008] In spite of their commercial success, this typology of bun cases is not free from
some drawbacks and/or operating limits.
[0009] Firstly, the particular frusto-conical shape does not offer a substantial resistance
to side deformations. This is mainly due to the fact that the side wall, taking into
account how it is manufactured (i.e. starting from a flat sheet), involves use of
excess material required for carrying out the side pleating.
[0010] In other words, if pressures are exerted on the side walls of the container from
the inside to the outside, the paper forming the container will tend to open and go
back to its original flat condition.
[0011] It should be also recognized that should the paper forming the container get damp,
due to the presence of the food product put inside it for example, the side wall would
tend to further loose its resistance to deformations and take its flat conformation
again.
[0012] Practically it often happens that when a food product is kept in a refrigerator (a
damp environment) the side wall will go back to its flat shape again, even if only
partly, so that replacement of the container before sale is required.
[0013] It is also to be pointed out that the container shape appears to have been substantially
unchanged and standardized for many years and therefore a modification of same surely
will help in giving a new particular aspect to the container/cake assembly making
it different and aesthetically more agreeable as compared with containers of known
type.
[0014] Accordingly, the present invention aims at substantially solving the above mentioned
drawbacks.
[0015] Within the scope of this technical task it is an important aim of the invention to
devise a container of paper material having an increased stiffness as compared with
known containers, in particular with reference to occurrence of side deformations.
[0016] It is another aim of the invention to enable the containers to be still stacked up
and also to give the same a particular shape and an aesthetically appreciable look.
[0017] It is a further aim of the invention to limit, and if possible prevent, side-wall
deformations due to dampness, the presence of which makes it necessary to replace
the container.
[0018] The technical task mentioned and the aims specified are substantially achieved by
a container of paper material for foodstuffs such as pastries which is characterized
in that said side wall, in section along a plane substantially perpendicular to the
bottom wall, is defined by a stretch of material joining said bottom wall to said
opening contour, and wherein said stretch has at least one curved portion.
[0019] Description of a preferred but not exclusive embodiment of a container of paper material
in accordance with the invention is now given by way of non-limiting example with
reference to the accompanying drawings, in which:
- Fig. 1 is a perspective view of a container in accordance with the present invention;
- Fig. 2 is a diagrammatic side view of the container in Fig. 1;
- Fig. 3 shows a partial section of the container in Fig. 1 taken in a horizontal plane;
- Fig. 4 is a diagrammatic side view of another variant of the container in accordance
with the invention; and
- Fig. 5 is a diagrammatic side view of a container of known type.
[0020] With reference to the drawings, the container of paper material in accordance with
the invention has been generally denoted by 1.
[0021] It is preferably made up of a single unitary sheet portion of flexible material,
generally paper (although a container manufacture involving more than one sheet, i.e.
one sheet for the bottom wall and one, fastened to the first one, for the side wall
for example, could be provided, even if with higher costs and more complicated manufacturing
processes).
[0022] This portion of paper material, cut out in the form of a circle for example if the
container must be of a circular shape, defines a flat bottom wall 2 from which a side
wall 3 emerges.
[0023] Since in its preferred embodiment the container is made starting from a single flat
sheet of paper material, the material designed to define the side wall 3 after the
first bending of same appears to be in excess and therefore is unable to define a
perfectly smooth wall.
[0024] Under this situation there are substantially two possible alternative solutions.
[0025] In a first typology of container (not shown) flattening of the side wall is carried
out by pressing the wall on itself so that it takes a conformation which is smooth
to the touch as much as possible.
[0026] It is apparent that since an excess material is present, a given number of uneven
pleats or wrinkles the predominant extension of which is transverse to the bottom
wall, will be created on the side wall itself.
[0027] Looking at this typology of containers it is possible to notice that in a section
of the side wall along a plane substantially parallel to the bottom wall, the profile
defined by the side wall will be of a substantially circular type, as much as possible
approaching the profile that would be defined by a perfectly smooth surface.
[0028] The excess material however highlights a certain number of regions of material overlapping
in said closed profile.
[0029] The other generally preferred typology of container (see Fig. 1) is on the contrary
provided with a series of small substantially vertical pleats evenly disposed on the
container.
[0030] This typology is that shown in the accompanying figures in which the side wall shows
a pleating formed of pleats or undulations 4 extending in a direction substantially
transverse to the bottom wall 2.
[0031] In detail, pleats are such structured that they give a tridimensional course to the
side wall that in a section of the container taken in a plane parallel to the bottom
wall, appears as provided with a closed circular profile 11 of undulated extension
giving the idea of a sinusoid (see Fig. 3).
[0032] The crests or hills of this sinusoid define a raised region 5 on the extension surface
of the side wall whereas the valleys define hollow regions.
[0033] Given the alternated and even succession of hills and valleys in the section, the
raised regions 5 and hollow regions 6 extend in mutual side by side relationship along
the whole extension of the side wall.
[0034] It is to be noted that the presence of a side wall of tridimensional extension resulting
from the undulations greatly increases resistance of the container to the stresses
tending to deform the container itself by flattening.
[0035] The bottom wall 2 and side wall 3 form a cavity 7 adapted to house a foodstuff and
having an upwardly-facing opening in the position of normal use of the container.
[0036] This opening defining the container cavity 7 is delimited by the bottom wall 2 and
the side wall 3 terminating at the upper part thereof with a border 8 defining the
contour of this opening.
[0037] In the preferred embodiment of the present invention the presence of any band turned
over outwardly in the extension of the side wall 3 to define an overturned rim is
not provided.
[0038] In other words, the side wall 3 emerges from the bottom wall 2 and terminates at
border 8 where it defines the opening contour.
[0039] As can be viewed from Fig 1, the upper border of the side wall is free and has a
substantially sinusoidal conformation seen from the top.
[0040] If the shape of the container being the object of the invention is examined in detail,
with reference in particular to Figs. 2 and 4 showing the container itself in a diagrammatic
side view, it is possible to see that in section along a plane substantially perpendicular
to the bottom wall 2 the side wall is defined by a stretch of material joining the
bottom wall 2 and the opening contour 8.
[0041] Advantageously, this stretch 9 has at least one curved portion 10.
[0042] Preferably the shape of this curved portion is adapted to give the side wall a substantially
concave course the concavity being directed towards the container cavity.
[0043] Generally, due to the fact that the container is made from a single sheet of paper
material, the curved portion substantially extends along the whole length of the stretch
defined in section by the side wall.
[0044] As shown in Fig. 2, the trace of the side wall in section in a vertical plane may
be defined for example by an arc of a circumference; alternatively, it may have a
more complicated course (shown in Fig. 3) consisting of a first stretch coming out
of the bottom wall which is substantially rectilinear, then of a curved portion 10
and finally of an end portion which is substantially rectilinear too and delimited
by border 8.
[0045] At all events, in both solutions shown the container is characterized in that the
side wall has a substantially outward-swelling conformation.
[0046] The containers of the invention have been mainly conceived for holding cakes of small
sizes (as previously said, they substantially are "bun cases") and therefore the bottom
wall will generally be of circular shape, as shown in the drawings, and will have
a diameter preferably included between 10 and 110 mm, more preferably in the range
of 20 to 90 mm.
[0047] The invention achieves important advantages.
[0048] First of all, after a long period of time a container of a particular shape has become
available for the first time which is capable of giving a different aesthetical impact
to the confectionery product on display.
[0049] From a more technical point of view, the particular conformation of the side wall
is of such a nature that the container ensures an optimal behaviour in terms of side
deformations.
[0050] In particular, in case of pressure exerted on the container and directed from the
inside to the outside, the wall would tend to close on the product instead of opening.
[0051] Even in the case of a damp environment, due to the conformation of the side wall
the paper fibre will tend to close on the product instead of opening and falling down.
[0052] It is not to be forgotten that the possibilities of stacking the products for storage
and transport is maintained substantially unchanged so that under this point of view
too, disadvantages are not contemplated with respect to the known art.
1. A container of sheet material, preferably paper, for foodstuffs, of the type comprising
a sheet portion of flexible material defining a substantially flat bottom wall (2)
and a side wall (3) emerging from said bottom wall (2), said bottom wall (2) and side
wall (3) forming a cavity having an upwardly-facing opening (7) in the normal use
position of the container itself, the side wall (3) under use conditions of the container
being delimited at the lower part thereof by the bottom wall (2) and at the upper
part by a border (8) defining a contour of the opening (7), characterized in that said side wall (3) in section along a plane substantially perpendicular to the bottom
wall (2) is defined by a stretch of material (9) joining said bottom wall to said
opening contour, said stretch (9) having at least one curved portion (10).
2. A container as claimed in claim 1, characterized in that said side wall (3) has a predetermined number of pleats (4) the predominant extension
of which is substantially transverse to the bottom wall, said pleats defining a closed
profile (11) of undulated, preferably sinusoidal course in a section of the side wall
(3) along a plane substantially parallel to said bottom wall (2).
3. A container as claimed in anyone of the preceding claims, characterized in that the curved portion (10) of the side wall (3) is substantially concave, with a concavity
facing the container cavity.
4. A container as claimed in anyone of the preceding claims, characterized in that said bottom wall (2) has a substantially circular conformation with a diameter preferably
included between 10 and 110 mm.
5. A container as claimed in anyone of the preceding claims, characterized in that said curved portion (10) substantially extends along the whole length of the stretch
(9) defined in section by the side wall (3).
6. A container as claimed in anyone of the preceding claims, characterized in that said container is made of a paper material and is defined by a single unitary sheet
portion suitably curved and bent.
7. A container as claimed in anyone of the preceding claims, characterized in that it does not have any border band turned over on the outside of said cavity (7) in
the extension of the side wall (3).
8. A container as claimed in anyone of the preceding claims, characterized in that said side wall (3) has an outward-swelling conformation.
9. A container of paper material for foodstuffs comprising a holding body defining a
cavity (7) having an upwardly-facing opening under conditions of normal use of the
container, the holding body consisting of a substantially flat bottom wall (2) and
a side wall (3) emerging from the bottom wall (2) and terminating with a free border
(8) defining a contour of said opening, characterized in that said side wall (3) has an outward-swelling shape adapted to at least partly surround
a food product housed in the container.