IT9020995U1 - TRAY OF PAPER OR SIMILAR MATERIAL, ESPECIALLY FOR PRODUCTS INTENDED TO BE FROZEN OR COOKED IN NORMAL OR MICROWAVE OVENS - Google Patents

Description

Description of the Industrial Utility Model entitled: "PAPER MATERIAL TRAY OR SIMILAR, PARTICULARLY: FOR PRODUCTS INTENDED TO BE FROZEN. 0; BAKED IN OVENS.! NORMAL OR MICROWAVE

DESCRIPTION

The present invention generally refers to containers, preferably made of paper or similar material and, more; in particular, to a tray for products to be displayed; freezing or cooking in a normal or microwave oven, capable of replacing the usual aluminum trays currently on the market.

As is known, there are aluminum trays on the market; which are not normally suitable for use in a microwave oven for cooking products;

Containers are also known mainly consisting of paper material, preferably cardboard, possibly coupled with other materials and which are intended to receive the paste of a product that must be baked and then sold; as such in the same container . These containers are generally formed starting from a single blank having folding lines such as to form the wall of. bottom, the two side walls and the two front walls of the container. Once the container is formed starting from this blank, flaps provided on the side walls or on the front walls are folded onto the front or side walls of the container and glued therein to ensure that the container thus obtained maintains its shape. .

The most evident drawback of such containers is given by the fact that the glues used, if subjected to the heat of the oven, can deteriorate, emit toxic gases, - loosen the grip and therefore the container can open. The same drawback can occur when these containers are used for freezing, in which case the glues can congeal, harden beyond measure and therefore crack.

The present invention intends to obviate these and other drawbacks by making a tray in paper material or the like for products to be frozen, to be cooked in a normal or microwave oven of the improved type which eliminates any glued part and which can be formed starting from a single blank. with simple bending operations without its walls presenting solutions of continuity and that it exhibits a remarkable sturdiness such as to be able to replace in all respects the current aluminum trays.

More specifically, the tray in paper or syncronized material for products intended to be frozen or cooked in a normal or microwave oven is of the lens type with a bottom wall, two side walls and two front walls obtained from a single starting blank and is characterized by the fact that this blank includes, in combination:

- a corner wall located between each front wall of the tray and the side wall adjacent to it and presenting a central folding line which divides it into two parts;

- a fin protruding from each front wall and divided into two longitudinal strips by a fold line terminating at its two ends with two notches so as to form two end tabs in the outer strip of said fin;

- the assembly of the walls of the tray by folding the two parts of each corner wall along their central folding line and by folding the two parts thus folded against the external surface of the relative front wall, with the opening of the . bellows facing up;

- the locking of the corner walls thus folded, being carried out by folding the flap of the front wall on these corner walls so that its internal strip partially covers them and then inserting the end tabs of its external strip under some folded corner walls.

Advantageously, on the free edge of each side wall and of the corner wall parts adjacent to it there is a protruding flap delimited by an internal folding line, this flap, once the corner walls have been folded into a bellows and folded against the external surface of the relative front wall, forming an element for stiffening the side walls of the tray and for gripping it.

Preferably, the notches provided in said fins are curved in shape and each outer strip of said fins has two oblique fold lines which delimit said end tongues.

Conveniently, each flap protruding from the side walls has, in correspondence with the fold lines that divide each side wall from the relative corner wall, two oblique fold lines that cross it and which are intended to determine the folding angle of this flap. with respect to the side walls of the tray.

Conveniently, a lid is provided formed by a blank having on two opposite sides a flap divided by a folding line into two strips of which the inner one is intended to cover the folded flap of each side wall of the tray and the outer one is intended to be folded under this flap.

The present invention will now be described in more detail in relation to the attached drawings, in which Figure 1 is a plan view of a blank for the production of a tray with a rectangular base for products to be frozen or cooked in a normal or second microwave oven. the present invention;

Figure 2 is a perspective view showing only partially the tray in the first step of its assembly, in which the corner walls are bellowed along their central fold line;

Figure 3 is a view similar to Figure 2, but showing the tray in the second phase of its assembly, in which the bellows-folded corner walls are folded against the front walls of the tray with the opening of the bellows facing the 'tall;

Figure 4 is a view similar to Figure 2, showing the tray in the third step of its assembly, in which the flap of the front wall is folded over the corner walls so as to close the opening of the bellows;

Figure 5 is a view similar to Figure 2, showing the tray in the finished assembled state, in which the end tabs of the front wall flap are folded under the folded corner walls;

figure 6 is a plan view of a variant of blank for the production of a tray with a square base according to the invention;

Figure 7 is a perspective view showing only partially the tray in the first step of its assembly, in which the corner walls are folded into a bellows along their central fold line;

Figure 8 is a view similar to Figure 7, but showing the tray in the second phase of its assembly, in which the bellows-folded corner walls are folded against the front walls of the tray with the opening of the bellows facing the tall;

the tray in the third stage of its assembly, in which the flap of the front wall is folded over the corner walls so as to close the opening of the bellows;

Figure 10 is a view similar to Figure 7, showing the tray in the finished assembled state, in which the end tabs of the flap of the front wall are folded under the corner walls;

Figure 11 is the plan view of a blank for forming the lid to be applied to the tray of Figures 6 to 10;

Figure 12 is a perspective view of the tray of Figures 6 to 10 with the lid applied; And

Figure 13 is a sectional view of the detail of the locking of the lid on the tray of Figures 6 to Now examining Figure 1, a die is shown therein; side indicated as a whole with 1, intended to form a tray for containing products to be frozen, to be cooked in a normal or microwave oven having a rectangular base. This blank has a central rectangular area A intended to form the bottom wall of the tray. From this area two areas B extend above and below which are intended to form the side walls of the tray. Each zone B is separated from zone A by a folding area 2. Two zones C extend to the left and right of this central zone A, destined to form the frontal areas of the tray. Each zone C is separated from the central zone A by a line between each area C and each area B there is a corner area D which is separated from the related area B by a bending line 4 and from the related area C by a bending line 5. corner D is divided at its center into two equal parts E and F by a fold line 6 which starts from the intersection of the fold lines 2 and 3 and thus forms the bisector of the angle formed by these lines.

A flap G protrudes from the free edge of each zone C, separated from zone C by a folding line 7 and divided into two strips H and I by a folding line 8. The folding line 8 does not extend over the entire width of the The flap G has a curvilinear shaped notch 9 at each of its two ends. These notches 9 form in; outer strip of this fin G two end tabs 10. Furthermore, strip I has two oblique fold lines 11 extending transversely thereto and. whose purpose will be described later.

Figure 2 shows ...] a.first training phase. of the tray. As can be seen, in this first operation the parts E and F of each corner zone D are bent a. bellows along the bending line 6 until they are in contact with each other.

The figure shows the second phase of forming the tray, in which the corner areas D thus folded into a bellows are folded against the external surface of the areas C constituting the front walls, with the opening of the bellows facing upwards. .

Figure 4 shows the third step of forming the tray, in which the flap G is folded down so as to partially cover the two bellows-folded areas D and to close their openings to prevent the product contained in it from escaping. .

Figure 5 shows the final stage of forming the tray, in which the end tabs 10 are inserted

below the zones D folded into a bellows using the

two oblique folds 11 which have been made in the strip I in order to favor the folding of the tabs 10 during their insertion.

Figure 6 shows a spindle, indicated as a whole with 11, intended for the formation of a tray, but having a square base and equipped with an element for reinforcing the side walls. In this figure, the | parts identical to those of Figure 1 are indicated with the same references and therefore will not be described further.

As can be seen from Figure 6, the areas B of the blank 20 intended to form the side walls of the tray each have a protruding edge L which also extends over the parts E of the corner areas D and separated from these areas by a line. of bending 1,2. This flap has, in correspondence with the fold lines 4 between the zones B and the parts E, two oblique transverse fold lines 13.

The purpose of the flap L is to provide a stiffening element for each side wall of the tray, so as to ensure that these do not bend when the products are introduced and during freezing or baking. This flap also serves to form gripping elements of the tray in order to avoid burns and to allow easy handling.

Figure 7 shows the first phase of the assembly of this pan with a square bottom which takes place substantially like the one shown in figure 2. During this first phase in which the corner areas D are folded into a bellows, the flap L remains protruding and aligned with the side walls.

Figure 8 shows the tray of Figure 7 in the second assembly step, in which the bellows-folded corner areas D are folded against the outer surface of the front walls C with the opening of the bellows facing upwards. In this way, the portion of the flap L which is between the transverse fold lines 13 is folded downwards and the portions of the flap L which lie outside the transverse fold lines 13 come to lie above the parts E of the corner areas D. In so doing and due to the resistance of these transverse folding lines 13, the section of the central flap assumes a certain angle of inclination with respect to the relative side wall.

Figure 9 shows the third stage of assembly of the tray of Figure 7, completely similar to that shown in Figure 4.

Figure 10 shows the final stage of assembly, entirely similar to that of Figure 5.

The tray thus obtained therefore has considerable stability and robustness, given precisely by the presence of the flaps L turned downwards which act as a stiffening element for the side walls and which at the same time form gripping elements for handling the tray.

Figure 11 shows a side punch 30 which serves to form the lid for the tray shown in Figures 6 to 10. This serves to create the lid. side has a central square area M having two edges N above and below separated from the area M by a folding line 14 and divided each into two strips 0 and P by a folding line 15. The strips 0 have a trapezoidal shape with the sides obliques that converge towards the outside, while the P strips also have a substantially trapezoidal shape with the oblique sides that converge towards the inside.

Figures 12 and 13 show the tray of figures 6 to 10 with the lid applied. In order to apply the lid, fold the flaps N so that the inner strips 0 cover the flaps L and then fold the outer strips P under the flaps L. Given the shape of strips 0 and P, once the strips P have been turned under the flaps L of the tray, the lid will remain locked in place. This is best seen in the section of Figure 13.

. As said, the tray according to the present invention is preferably made of paper material and can be constituted for example by a cardboard. As a variant instead of cardboard, it is possible to use, for example, a laminate of paper and synthetic resin. Among the resins which are best suited for forming such couplings, it is possible to mention, for example, the various types of polyethylene and polypropylene and polyester which are non-toxic.

Naturally, the tray with a rectangular base represented in Figures 1 to 5 could also be provided with the stiffening flap L of the side walls and for gripping it, it could have a lid for its closure, formed as the one shown in the figure there, where the zone M, instead of being square, will be rectangular.

From the above, it can be easily seen that the tray made with the blanks described is easy to assemble, does not have continuity solutions in its various walls and therefore is completely sealed and has a pronounced sturdiness and stability that make it particularly suitable for be used as a tray for display, freezing and cooking in a normal or microwave oven of products, since, being totally made of cardboard, it does not interfere with the action of microwaves.

Claims (1)

CLAIMS 1) Tray in paper or similar material, particularly for products intended to be frozen or cooked in a normal or microwave oven, of the type having a bottom wall, two side walls and two front walls obtained from a single starting blank, characterized by the fact that such blank includes, in combination: - a corner wall located between each front wall of the tray and the side wall adjacent to it and presenting a central folding line which divides it into two parts; - a fin protruding from each front wall and divided into two longitudinal strips - by - a fold line terminating at its two ends with two notches so as to form two end tabs in the outer strip of said fin; - the assembly of the walls of the tray by folding the two parts of each corner wall along their central folding line and by folding the two parts thus folded against the external surface of the relative front wall with the opening of the bellows facing up; - the locking of the corner walls thus folded by being carried out by folding the flap of the front wall on these corner walls so that its internal strip partially covers them and closes the opening of the bellows and then inserting the end tabs of its outer strip below the folded corner walls. 2) Tray according to claim 1, characterized in that on the free edge of each side wall and of the parts of the corner wall adjacent to it there is a protruding edge delimited by an internal folding line, said edge, once the corner walls have been folded into a bellows and folded against the external surface of the relative front wall, forming an element for stiffening the lateral walls of the tray and for gripping it. ' 3. Tray according to claim 1 or 2, characterized in that the notches provided in said fins are curved in shape and each outer strip of said fins has two oblique fold lines which delimit said end tongues. 4) Tray according to claim 2, characterized in that each flap protruding from the side walls has, in correspondence with the folding lines that divide each side wall from the relative corner wall, two oblique folding lines that cross it and which are intended determining the folding angle of said flap with respect to the side walls of the tray. 5) Tray according to the preceding claims, characterized by it! fact that a lid is provided consisting of a blank having on two opposite sides a flap divided by a folding line, in two strips of which the inner one is intended to cover the folded flap of each side wall of the tray and the outer one is intended to be folded under this flap. 6) Tray made of paper or similar material, particularly for products to be frozen or cooked in a normal or microwave oven, all substantially as described above and as illustrated in the attached drawings.