Product package and a method for producing the package

Abstract

The object of the invention is a product package and a method for producing the product package. The product package comprises a recess (1a) for the product to be packed, the recess being provided with a base and with walls in connection with the base, in which case the frame part (2) of the recess (1a) has been formed by means of folds from recyclable fiber material and the aforementioned recess (1a) is lined on the inside with a separate inner lining (3), which is removable from the aforementioned frame part. The top edges of the side walls and end walls of the frame part and also the top edges of the corner parts (10) form the top edge of the recess, which top edge is arranged to function as a fastening surface for the inner lining (3), which inner lining (3) is adapted to comprise an edge section (4) extending over the top edge (5a) of the recess (1a).

Claims

1. Product package, which comprises a recess for the product to be packed, the recess being provided with a base and with walls in connection with the base, in which case a frame part of the recess has been formed by means of folds from recycleable fiber material and the aforementioned recess is lined on the inside with a separate inner lining, which is removable from the aforementioned frame part, characterized in that top edges of side walls and end walls of the frame part and also top edges of corner parts form the top edge of the recess, which top edge is arranged to function as a fastening surface for the aforementioned inner lining, which inner lining is adapted to comprise an edge section extending over the top edges of the recess, wherein the frame part has no edge flanges extending in a sideways direction, and wherein the fastening surface of the top edge of the recess for the inner lining is a folding point, where an upward pointing wall part is folded into a downward pointing wall part, and also the fastening surface on the corner parts of the recess is the top edges of two corner pieces fastened to overlap each other.

2. Product package according to claim 1, characterized in that the top surfaces of the folding points of the side walls and end walls and the top edges of the corner parts form the essentially integral top edge of the frame part and simultaneously of the recess.

3. Product package according to claim 1, characterized in that the top edges of the side walls and end walls and the top edges of the corner parts form the essentially integral top edge of the frame part and simultaneously of the recess.

4. Product package according to claim 1, characterized in that the material thickness of the essentially integral top edge of the recess is essentially between 1 . . . 2 times the material thickness of the package blank.

5. Product package according to claim 1, characterized in that the material of the frame part is recycleable board.

6. Product package according to claim 1, characterized in that the product package is a foodstuff package and the inner lining is foodstuff plastic.

7. Method for producing a product package, which product package comprises a recess for the product to be packed, the recess being provided with walls, in which case the frame part of the recess has been formed by means of folds from recycleable fiber material and the aforementioned recess is lined on the inside with a separate inner lining, which is removable from the aforementioned frame part, characterized in that a lid of the product package is fastened to an edge section of the inner lining extending over top edges of the recess, wherein the inner lining is fastened to a top edge of the recess along a folding point in the walls of frame part formed where an upward pointing wall part is folded into a downward point wall part, and wherein the frame part has no edge flanges extending in a sideways direction.

8. Method according to claim 7, characterized in that the lid of the product package is fastened with heat sealing or with some other suitable fastening method to the section of the inner lining extending over the top edge of the recess by performing the heat sealing or other fastening directly onto the section of the inner lining.

9. Method according to claim 7, characterized in that, in connection with the fastening of the inner lining, the section of the inner lining extending over the top edge of the recess is used for tensioning the inner lining against the top edge of the recess functioning as a fastening surface.

Description

(1) In the following the invention will be described in more detail by the aid of one example of its embodiment with reference to the attached simplified drawings, wherein

(2) FIG. 1 presents a product package according to the invention as viewed obliquely from the side and from above,

(3) FIG. 2 presents a top view of a product package according to the invention as an opened blank before it has been folded into a product package,

(4) FIG. 2a presents a simplified side view, not to scale, of one sectioned corner of the product package according to FIG. 2,

(5) FIG. 3 presents a top view of a second product package according to the invention as an opened blank before it has been folded into a product package,

(6) FIG. 3a presents a simplified side view, not to scale, of one sectioned corner of the product package according to FIG. 3,

(7) FIG. 4 presents a simplified side view, not to scale, of a sectioned product package according to the invention, with the lid fastened,

(8) FIG. 5 presents a simplified side view, not to scale, of one sectioned corner of the product package according to FIGS. 2 and 4, with the lid fastened, and

(9) FIG. 6 presents a simplified side view, not to scale, of one sectioned corner of the product package according to FIG. 3 with the lid fastened.

(10) FIG. 1 presents a product package 1 according to the invention as viewed obliquely from the side and from above, while FIGS. 2 and 3 present the product package from above and with the folds opened. Preferably the product package 1 according to the invention is a foodstuff package, e.g. for a ready meal. The product package 1 comprises a frame part 2 and an inner lining 3, which comprises an edge, i.e. an edge section 4, extending over the top edges of the frame part 2. The frame part 2 comprises a base, two side walls, two end walls and the corner sections 10 between them. Some suitable recyclable fiber material is used as the manufacturing material of the frame part 2. Preferably the material is e.g. corrugated board, board or some other suitable recyclable fiber material. The inner lining 3 is foodstuff plastic and after use it can easily be detached from the frame part 2, in which case the frame part 2 can be delivered to recycling.

(11) The frame part 2 is produced by folding it e.g. mechanically, from the blank 2a presented in FIG. 2 or 3 into its shape presented in FIG. 1. The blank 2a is precut to be such that a product package 1 of the desired shape and size is obtained from it by folding, which product package comprises a recess 1a provided with walls, the recess being for the food to be packed, such as for a foodstuff portion.

(12) In the blank 2a of the frame part 2 presented in FIG. 2 is a base 5, side walls composed of the two parts 6 and 7, also end walls composed of the two parts 8 and 9, and additionally corner pieces 10a. The blank 2a is arranged to be folded into an assembled frame part 2 in such a way that the first parts, i.e. the inside parts 6 and 8, of the side walls and end walls are folded in a first direction, i.e. essentially upwards from the folding points 6a and 8a, and the second parts, i.e. the outside parts 7 and 9, of the side walls and end walls are folded into a second direction, i.e. essentially downwards, from the folding points 7a and 9a. The second parts 7 and 9 of the walls are folded into attachment with the first parts 6 and 8 and fastened to them e.g. by gluing. In this case the first parts 6 and the second parts 7 of the side walls together form the side walls of the frame part of the product package 1, the thickness of which side walls is essentially double the thickness of the blank material, and correspondingly the first parts 8 and the second parts 9 of the end walls together form the end walls of the frame part of the product package 1, the thickness of which end walls is essentially double the thickness of the blank material.

(13) The folding of the frame part 2 is arranged to be carried out in such a way that the corner pieces 10a of the blank 2a overlap each other and they are fastened to each other by means of glue, in which case the corner pieces 10a form the corner parts 10 between the side walls and the end walls of the frame part 2. The corner parts 10 can be curved, as presented in the embodiment, in which case they form rounded corners. The corner parts 10 can just as well form beveled corners or also right-angled corners, as in rectangular boxes.

(14) FIG. 2a presents a simplified side view of one sectioned corner of the product package 1 made from the blank 2a presented in FIG. 2. FIG. 2a is not presented to scale and the thickness of the blank material is exaggerated.

(15) When the blank 2a has been folded to completion into a box-type frame part 2 comprising a recess 1a, the folding points 7a and 9a between the first and second parts 6 and 7 as well as 8 and 9 of the side walls and end walls and the top edges of the corner parts 10 form the essentially integral top edge 5a of the frame part 2 and simultaneously of the recess 1a. On the top edge 5a of the frame part 2 there are no edge flanges extending in the sideways direction, as there are in solutions known in the art, but instead only an essentially curved, possibly upwardly convex folding point 7a and 9a, which functions as a fastening surface for the inner lining 3.

(16) In the blank 2a of the frame part 2 presented in FIG. 3 is a base 5, side walls composed of one part 6, and likewise end walls composed of one part 8, and additionally corner pieces 10a. The blank 2a is arranged to be folded into an assembled frame part 2 in such a way that the parts 6 and 8 forming the side walls and end walls are folded essentially upwards, from the folding points 6a and 8a, in which case a box-type frame part 2 comprising a recess la is formed, the thickness of the base 5 and side walls and end walls of which frame part being essentially the same as the thickness of the blank material.

(17) FIG. 3a presents a simplified side view of one sectioned corner of the product package 1 made from the blank 2a presented in FIG. 3. FIG. 3a is not presented to scale and the thickness of the blank material is exaggerated.

(18) When the blank 2a has been folded to completion into a box-type frame part 2 comprising a recess 1a, the free edges, i.e. the top edges, of the side walls and end walls 6 and 8 and the top edges of the corner parts 10 form the essentially integral top edge 5a of the frame part 2 and simultaneously of the recess 1a. On the top edge 5a of the frame part 2 there are no edge flanges extending in the sideways direction, as there are in solutions known in the art, but instead only a fastening surface essentially the thickness of the material of the blank for fastening the inner lining 3.

(19) FIGS. 4-6 present a simplified side view of a sectioned product package 1 according to the invention, with the lid 11 fastened into position. The product package 1 is not presented to scale and for the sake of clarity the material thicknesses are presented as thicker than normal. In FIGS. 4-6 the parts of the inner lining 3 and of the lid 11 that extend to outside the top edges 5a of the product package 1 are, for the sake of clarity, presented as horizontal sections, but in reality they often bend downwards as much as the material of the lid 11 allows. When the material of the lid 11 is thin and soft, the aforementioned outer sections of the top edge 5a bend almost perpendicularly downwards when the product package 1 is in the normal position, e.g. on a table or other planar surface. The inner lining 3 and the lid 11 can be made to be such that they do not bend downwards by themselves, but instead they are deliberately folded downwards, they remain essentially horizontal, or they are folded upwards either obliquely or at a right angle.

(20) The plastic inner lining 3 is fastened to the frame part 2 and it is arranged to make the package airtight together with the lid 11. The fastening of the inner lining 3 is performed e.g. in such a way that negative pressure is produced below the frame part 2 and positive pressure above it. By means of the negative pressure the inner lining 3, which has glue on its bottom surface, is arranged to be sucked into attachment with the inside surface of the frame part 2. This occurs by sucking the air out from between the frame part 2 and the inner lining 3 placed inside it through the frame part 2 by means of the negative pressure. The positive pressure above the package also gives further assistance to the fastening. With the method described above the inner lining 3 is attached in a leak-tight manner to the inside surface of the frame part 2.

(21) As stated above, the frame part 2 has no edge flanges at all extending in the sideways direction. Instead, the inner lining 3 is dimensioned in such a way that it extends over the top edges 5a of the frame part 2 and forms an essentially narrow edge 4 resembling an edge flange. The lid 11 of the product package 1 is arranged to be fastened to this edge 4 e.g. with heat sealing or with some other suitable fastening method. Performing heat sealing directly onto the thin plastic of the inner lining 3 is considerably easier and more dependable compared to if there were a thicker edge flange under the plastic. This is because compressive force can be exerted directly onto the seam, in which case the compressive force being exerted onto the seam is certainly sufficient for achieving a reliable and leak-tight seam.

(22) FIG. 6 presents a structure according to one preferred embodiment of the invention, which is also presented in FIGS. 3 and 3a. This structure differs from, among others, the structure according to FIGS. 4 and 5 in that only a single layer of material is in the side walls and end walls of the product package, i.e. only the wall parts 6 and 8 bent essentially upwards from the base 5, of which only one of the side wall parts 6 is presented in FIG. 6. The inner lining 3 is fastened to the inside surface and top edge 5a of the frame part 2 in essentially the same way as in the structure according to FIG. 5. Likewise, the lid 11 is fastened to the top surface of the inner lining 3 in essentially the same way as in the structure according to FIG. 5.

(23) As stated previously, on the top edge 5a of the recess 1a there are no edge flanges extending in the sideways direction, but instead only a fastening surface essentially determined by the thickness of the material of the blank 2a for fastening the inner lining 3. In this case the material thickness of the essentially integral top edge 5a of the recess 1a is, depending on the structure of the wall of the product package 1, essentially between 1 . . . 2 times the material thickness of the package blank 2a.

(24) It is obvious to the person skilled in the art that the invention is not limited solely to the examples described above, but that it may be varied within the scope of the claims presented below. Thus, for example, some structural solutions can also be different to what is presented above. In this case the outer layer of the side walls and end walls of the frame part presented e.g. in FIGS. 2, 2a, 4 and 5 can be essentially narrower than the inner layer, in which case the outer layer extends from the top edge of the wall downwards for only a short distance, but however extends downwards far enough for it to strengthen the top edges of the walls and make possible a fastening surface, wider than one wall layer, for the inner lining.

(25) It is also obvious to the person skilled in the art that the product packages can also be different in shape to what is presented above. The simplest and most common frame part of a product package is of a rectangular shape, which is presented as an embodiment in all the figures. However, the shape of a package can be other than the rectangular-type shape of a box. Thus the shape can be e.g. polygonal or also round or oval, depending on e.g. the fold lines prefabricated in the blank.

(26) It is further obvious to the person skilled in the art that the product packages can be of some other material than recyclable fiber material. Thus, the frame part of a product package can be produced from some other foldable material than corrugated board. The frame part of a product package can be produced e.g. from different boards, cardboards or papers or also from woven material, or from combinations of different materials.