DE3940162A1 - Sealed dish or packing foodstuff - is made by folding rectangular sheet of plastics coated cardboard - Google Patents

Abstract

A liq. tight and gas tight packing is made in the form of a shallow rectangular dish which is provided with a cover. The dish is made from a sheet of thin cardboard which is coated with plastics which enables the cover to be heat sealed to the dish flanges. The dish is made from a rectangular blank which is folded to form sloping side walls and turned out flanges (17,18,19,20). The edges (29) to (32) of these flanges form continuous lines with the sides of the square areas (21) to (24) at the dish corners when the blank is folded to form the dish. USE - Packing of foodstuff.

Description

The invention relates to a liquid and gastight lid pack from a pot or bowl-shaped body made of heat sealable Cardboard plastic multi-layer composite material and one on it sealable lid from at least one side heat sealable plastic in particular Plastic multi-layer composite material, in which the body a blank with a fold polygonal bottom panel, from folded up around fold lines Sidewall panels with fold lines folded outwards, circumferential sealing edge fields parallel to the bottom field for the lid with external cut edges and from between the side wall panels formed by folding pockets Corners consist of at least two each Fold lines include delimited triangle fields, each with  a triangular tip the bottom field and with at least the the triangle tip adjacent to the respective side wall panel touch the other edge of the triangle with a sealing edge field, being from these two other triangle tips to each other parallel, the neighboring field of seals cross crossing fold lines.

Lid packs of this or similar type are used to pack perishable products such as foodstuffs in a durable manner. If necessary, they should also enable the product contained in them to be heated in a stove or the like. Depending on the type of product to be packaged and its treatment for permanent storage and the type of heating for the purpose of consumption, different requirements must be placed on the lid pack:
In the case of fresh or short-lived and deep-frozen foods, only a limited liquid and possibly also water vapor tightness against cold burn is required for the pack of fresh or frozen foods.

In the case of foods to be packed aseptically, a Liquid and gas tightness for the pack for Food demands.

Practical requirements meet these requirements Lid packs made of sheet metal, glass and full plastic or from a plastic multilayer composite. In However, food packaged in sheet metal cannot be Warm the microwave oven. Glass packs have that Disadvantage that they are heavy, bulky and break easily, especially if they have the shape  of a tray in which the food is served can. Packs of full plastic or from one Plastic multilayer composite have the disadvantage that they are generally more expensive and in terms of their Environmental friendliness can be critically assessed.

Also with one known from practice and patent literature Lid pack of the type mentioned at the beginning (DE 36 12 998 A1), whose body consists of one Cardboard plastic multi-layer composite material meets the requirements mentioned. The cut for the However, the body has a complicated shape with corners provided incisions and undercuts, which is why complicated for the production of such a blank Knife shapes are required.

The invention has for its object a lid pack to create the type mentioned, in which the Cut for the body is as simple as possible.

This object is achieved in that in unfolded state of the blank from the floor panel to Seal edge field leading and the adjacent side wall field averted fold line of each triangular field in the interior of the body and the length of an overlap of the incised seal edge fields like that Distance parallel from the triangle tips Is fold lines, and that the cut edges of the blank make no incisions such that in the unfolded State of the cut all cut edges on the continuous outer edge of the sealing edge fields.

The lid pack according to the invention is because of the chosen Cardboard plastic multi-layer composite material for the body environmentally friendly and gives the pack in conjunction with the  relatively large coverage areas of the sealed Sealing edge fields in the area of the corners of the lid pack one sufficient rigidity. Within the set limits the folding geometry will not be blanks with complicated Cut edges needed. From the geometry of the body and It depends on the folding geometry, whether more or less or even there is no waste when cutting. In any case, they are Simply cut edges. Because of the seamless body and its exclusively outer cut edges effectively prevents that packed in the lid pack External product that affects durability Influences, is exposed. The lid pack is suitable therefore especially for frozen or short-term durable foods or for aseptically packaged Food. Their content can be combined in one simple stove as well as when using a metal-free Heat the composite in a microwave oven.

Optimal use of the composite material for the Lid pack with the simplest cut of the Cut edges of the blank is achieved when the of parallel folding lines starting from the triangle tips Cutting edge of the cut in the area of the side wall panels cut at a right angle. In this case all cut edges of the blank straight, that is, there is no waste when creating the blanks.

Provided the condition that that of the triangle tips outgoing parallel fold lines the cutting edge of the Cutting in the area of the side wall panels under one cut right angle, is not met, you get to the corners of the blank either offset inwards or outside, whereby because of the generally longer length of the Sidewall panels compared to the corner panels Offset inward less waste when cutting  brings. The production of such a blank requires designed accordingly due to the offset Knife. The alternative of using the space becomes an offset inside preferred because of this Alternatives are the floor panel and the height of the side panel panels are the same size as a waste-free blank. At a cut with an offset of the corners to the outside on the other hand, the dimensions of the floor field and / or the Height of the side wall fields smaller.

According to further embodiments of the invention, the Corner fields of the carcasses open or closed Folding pockets may be provided. Under "open pockets" means one does not touch corners and under "closed pockets" on the side panels adjacent triangular fields. The condition for open Folding pockets is that of the ground field Angles of the triangular field the angle of which one leg from the starting from the floor panel, on the side wall panel adjacent fold line is formed larger than the angle is one leg from the fold line between the Triangular field and the neighboring seal edge field and its other leg from that of the parallel fold lines in the Seal edge field is formed by that of the bottom field outgoing fold line of the Triangular field. The condition for closed Folding pockets is that the two angles mentioned are the same are. To prevent yourself from being closed Folding pockets form liquid nests that form when heated the contents of the packaging with a microwave are problematic, can the adjacent triangle and side wall panels be sealed.

The angles of the two triangular fields, the legs of which from the fold lines starting from the bottom panel are formed,  determine the inclination of the side walls to the floor. If the side walls are to have the same slope, then to choose these angles right away. Should they have uneven slope then they should be chosen differently. If they are not the same There is a different height of the angles Sidewall panels.

The corner fields of a body can be created with the Design triangular fields differently. After a first one Alternatives can be the adjacent fold lines of the two triangular fields collapse. According to a second alternative, the Fold lines include a triangle or square. in the In the case of a triangular field, its tip can be aligned with that Peaks of the neighboring triangular fields touching the ground field collapse. The tips of the two triangular fields adjacent to the side wall panels but can also be arranged at a distance from one another, which is both a triangular field and a Vierfeldfeld can be realized. Rectangular and trapezoidal fields. In all versions, the Angle of the side triangular fields and the middle Triangular or quadrangular corners with open and realize closed pockets.

The lid of the lid pack can vary depending on the application both from a sealable cardboard plastic or from a plastic multilayer composite - also with Aluminum foil insert - exist.

In the following the invention is based on a Drawing illustrating embodiments explained. In detail show:

Fig. 1 a bowl-shaped body of a lid pack in a perspective view,

Fig. 2 shows the cabinet of FIG. 1 in side view,

Fig. 3 shows the body of Fig. 1 in top view,

Fig. 4 shows a blank for the body of Fig. 1 in top view,

Fig. 5 shows a detail of the blank according to Fig. 4 in the region of a corner panel in an enlarged representation,

Fig. 6 shows a detail from six different basic types of blanks in the region of a corner of the field,

Fig. 7 shows a detail corresponding to FIG. 5, in a modified embodiment

Fig. 8 shows a further embodiment,

Fig. 9 is a cup-shaped body of a cover wrap, in a variant to Fig. 1 embodiment in a perspective representation

Fig. 10 the body of FIG. 9 in side view;

Fig. 11 the body of FIG. 9 in plan view

Fig. 12 shows a blank for the body of Fig. 9 in plan view

Fig. 13 shows a detail of the blank according to Fig. 12 in the region of a corner panel in an enlarged representation,

Fig. 14-18 of cutouts to Fig. 12 modified blanks for different corner arrays in an enlarged scale;

Fig. 19 is a lid pack with the body of FIG. 9 fragmentary cross-section with single-layer sealing edge panel,

FIG. 20 shows the lid pack according to FIG. 19 in detail in cross section with a folded sealing edge field in the area of the overlap and

FIG. 21 shows the lid pack according to FIG. 19 in detail in cross section with the carton plastic multilayer composite material for the body and the lid shown in detail.

Although the invention applies to all embodiments Lid packs with a rectangular bottom is explained, can the features of the invention also Lid packs with a different format bottom, for example in a lid pack with a triangular bottom. So much for the drawing Blanks and clippings of blanks shows are the Fold lines drawn with dash-dotted lines.

The lid pack according to FIGS . 1 to 3 in connection with FIGS . 19 to 20 consists of a bowl-shaped body K made of sealable cardboard plastic multilayer composite material and a sealed lid D. As can be seen from FIG. 21, the body K is on a carrier 1 a single-layer barrier layer 3 is laminated onto one side of cardboard. A heat-sealable layer 5 is applied to the barrier layer 3 .

It goes without saying that the cardboard insert 6 can also be dispensed with in the case of the cover D if high rigidity of the cover is not important.

The in Figs. 1 to 3 shown bowl-shaped body K with open pockets in the corners, which is formed by folding a rectangular blank consisting of a rectangular bottom panel 12, adjacent to this bottom panel 12 outwardly inclined to the bottom panel 12 arranged side wall panels 13 to 16 with outwardly folded sealing edge panels 17 to 20 parallel to the bottom panel 12 and corner panels 25 to 28 arranged between the side panel panels 13 to 16 . This body K is formed by unfolding the blank shown in Fig. 4 and is characterized in that the blank has no incisions and undercuts in the edge area and all cut edges 29 to 32 of the blank coincide with the outer edges of the sealing edge fields 17 to 24 of the unfolded blank .

In the illustrated in Fig. 4 blank, the bottom panel 12 is defined by four fold lines 33 to 36, which fold lines run parallel to 40 37. Between these parallel fold lines 33 to 40 lie the side wall panels 13 to 16 , which are laterally delimited by fold lines 41 to 48 . The sealing edge panels 17 to 20 adjoining the side wall panels 13 to 16 are delimited on one side by the folding lines 37 to 40 and on the other side by the cutting edges 29 to 32 of the blanks.

As also shown in FIG. 5 in an enlarged representation for all corner areas, another fold line 49 runs between the fold lines 41 , 42 which, with the two fold lines 41 , 42 and a further fold line 50 , delimit identical triangular fields 51 , 52 which limit the corner field 25 form. A pair of parallel folding lines 53 to 56 each extend from the corners of the triangular fields 51 , 52 lying on the folding line 50 , which run through the sealing edge fields 17 , 18 , 21 and cut the cutting edges 29 , 30 at a right angle. Under this condition, which is decisive for waste-free cutting, the sum angle of the triangles 53 enclosed by the folding lines 41 , 42 is . If it is smaller, the cutting edges 29 , 30 are offset inward in the corner region ( FIG. 7), and if it is larger, there is an offset outward ( FIG. 8) and thus no waste-free cutting.

By unfolding the blank so that the common fold line 49 of the triangular fields 51 , 52 lies inside the body K and the fields 57 , 58 lying between the parallel fold lines 53 to 56 rest on the adjacent sealing edge fields 17 , 18 , a body K results with inclined walls and continuous sealing edge running parallel to the floor, in which the cutting edges 29, 80 of each side coincide. Between the triangular fields 51 , 52 and the adjacent side wall fields 13 , 14 there are pockets open towards the inside of the body K. In the area of the corners, in the plane of the sealing edge fields, support fields 59 to 62 protrude into the body K, which are supported by the triangular fields 51 , 52 and are therefore suitable as supports for cover packs to be stacked one above the other.

In Figs. 6 to 17 are 1 to FIGS. 5 to corresponding elements the same reference numerals, increased by the number 100, 200, 300, etc., is used. For this reason, only the main differences between the modified exemplary embodiments are discussed below.

Six basic types for the corner fields, which all comprise at least two triangular fields, can be assigned to all of the exemplary embodiments. As shown in FIG. 6, starting from type 1.), there can be another field between the two triangular fields, for example a triangular field with tip type 2.) touching the bottom field, or with tip type 3.) touching the sealing edge field, or a Square field, in particular a rectangle type 5.), or a trapezoid with a short side adjacent to the floor field type 4.), or with a long side adjacent to the floor field type 6.), in order to obtain different corners. With all types, corners with open or closed pockets can be obtained from waste-free or waste-containing blanks via the selected geometry of the corner fields, as the further detailed exemplary embodiments show.

The exemplary embodiments of FIGS . 7, 8 differ from those of FIGS. 1 to 5 primarily in that the parallel fold lines 153 to 156 and 253 to 256 do not intersect the cut edges 129 , 130 , 229 , 230 at a right angle, which is why either in the area of the corner fields 121 , 157 , 158 (sum angle of the triangle fields 151 , 152 <53 °) or in the area of the sealing edge fields 217 , 218 (sum angle of the triangle fields 251 , 252 <53 °) cutting loss occurs.

The exemplary embodiments of FIGS . 9 to 13 differ from those of FIGS. 1 to 5 above all in that the adjacent folding lines 349 a, 349 b of the two triangular fields 351 , 352 do not coincide, but instead include an isosceles triangular field 300 (basic type 2 ). In accordance with the exemplary embodiments in FIGS. 1 to 5, the tips of the outer triangular fields 351 , 352 touching the bottom field 312 lie together. In contrast to the previous exemplary embodiments, in the flat state of the blank, the outer fold lines 353 , 356 are flush with the fold lines 341 , 342 of the bottom.

Because of these aligned fold lines, a body results in the unfolded state, in which the pockets formed on one side by the triangular fields 351 , 332 are closed.

At an angle δ = 19 ° enclosed by the folding lines 341 , 349 a, 342 , 349 b, the triangular field is perpendicular to the floor field 312 and the wall fields 313 , 314 are inclined outwards with respect to the floor field.

The embodiment of FIG. 14 differs from that of FIG. 13 only in that the angle δ = 27 °. For the unfolded blank, this means that the triangular field 400 is inclined inwards to the bottom field 412 and the wall fields 413 , 414 are perpendicular.

The embodiment of FIG. 15 differs from that of the two previous embodiments in that the two angles δ ₁ , δ ₂ , which include the fold lines 541 , 549 a, 542 , 549 b of the triangular fields 551 , 552 , are of different sizes. This results in a central triangular field 500 with fold lines 541 , 549 a, 542 , 549 b of different lengths and side wall fields 513 , 514 of different widths. In the unfolded state, this modified geometry leads to the sidewall panels 513 , 514 being inclined to different degrees. Because of the aligned folding lines 541 , 553 and 542 , 556 , the pockets delimited on one side by the triangular fields 551 , 552 remain closed as in the two previous exemplary embodiments. Also, because of the parallel fold lines 553 to 556 which cut the cut edge of the blank at a right angle, the cut remains waste-free.

The embodiment of FIG. 16 differs from that of FIGS. 9 to 14 above all in that the corners of the triangular fields 651 , 652 touching the bottom field 612 are arranged at a distance from one another (basic type 5 ). This means that the field 600 lying between these triangular fields 651 , 652 , for example a square field, is a rectangular field in this case. Because of the non-aligned fold lines 641 , 653 , 642 , 656 , the pockets formed by the triangular fields 651 , 652 are open in the unfolded state. The rectangular field 600 is perpendicular to the floor field 612 , while the side wall fields 614 are inclined outwards.

The exemplary embodiment of FIG. 17 is modified compared to that of FIG. 16 in that on the one hand the square field is a trapezoidal field and on the other hand the fold lines 741 , 753 , 742 , 756 are aligned. Because of the aligned fold lines, the pockets in the corners are closed when unfolded.

The embodiment of FIG. 18 differs from that of FIG. 16 primarily in that between the outer triangular fields 851 , 852 a triangular field 800 is inserted which, in contrast to the exemplary embodiments in FIGS. 13, 14, is rotated by 180 °, so that it touches the bottom panel 812 with two tips and the folding line 850 of the outer triangular panels 851 , 852 with one tip. In the unfolded state, the side wall panels 813 , 814 are perpendicular to the base panel 812 , the pockets are open and the triangular panel 800 is inclined towards the inside.

Claims (12)

1.Liquid and gas-tight lid pack made of a pot-shaped or bowl-shaped body (K) made of heat-sealable cardboard multi-layer composite material and a cover (D) which can be sealed thereon made of at least one side heat-sealable plastic, in particular cardboard plastic or plastic multi-layer composite material, in which the body (K) consists of a Folding lines provided with a polygonal bottom panel ( 12 ), from side panel panels ( 13-16 ) folded up by folding lines ( 33-36 ) of the bottom panel ( 12 ) with side panels ( 13-16 ) folded outwards by folding lines ( 37-40 ) and parallel to the bottom panel ( 12 ), circumferential sealing edge fields ( 17-24 ) for the lid (D) with external cut edges ( 29-32 ) and corner fields formed between the side wall fields ( 13-16 ) by folding pockets, each of which has at least two triangular fields ( 51 , 52 ) delimited by folding lines comprise, each with a tip the bottom field ( 12 ) and with at least the j The respective side wall panel ( 13-16 ) of the adjacent tip of its two other tips touch a sealing edge panel ( 17-20 ), whereby folding lines ( 53-55 ), which run parallel to one another and cross the adjacent sealing edge panel ( 17-24 ), originate from this characterized in that, in the unfolded state of the blank, the fold line ( 49 ) of each triangular field ( 51 , 52 ) leading from the bottom field ( 12 ) to the sealing edge field ( 17-24 ) and facing away from the adjacent side wall field ( 13-16 ) in the interior of the body (K ) and the length of an overlap of the incised sealing edge fields ( 17-24 ) is equal to the distance from parallel folding lines ( 53-56 ) starting from the tips of the triangular fields ( 51 , 52 ), and that the cutting edges ( 29-32 ) of the blank run without incisions such that in the unfolded state of the blank all cut edges ( 29-32 ) on the continuous outer edge of the sealing edge fields ( 17-24 ) are left egen. 2. Lid pack according to claim 1, characterized in that the starting from the tips of the triangular fields ( 51 , 52 ), parallel folding lines ( 53-56 ) the cutting edges ( 29-32 ) of the blank in the region of the side wall panels ( 17-24 ) under cut at a right angle. 3. Lid pack according to claim 1 or 2, characterized in that of the angles away from the ground field of each triangular field ( 51 , 52 ) the angle, one leg of the starting from the bottom field ( 12 ), adjacent to the side wall field ( 13 , 14 ) fold line ( 41 , 42 ) is larger than the angle, one leg of the fold line ( 50 ) between the triangular field ( 51 , 52 ) and the sealing edge field ( 17 , 18 , 21 ) and the other leg of that of the parallel fold lines ( 53-56 ) are formed in the sealing edge field ( 17 , 18 , 21 ), which starts from the folding line ( 4 ) of the triangular field ( 51 , 52 ) starting from the bottom field ( 13 ) and not adjoining the side wall field ( 13 , 14 ). 4. Lid pack according to claim 1 or 2, characterized in that from the ground field distant angles of each triangular field ( 51 , 52 ) the angle, one leg of the starting from the bottom field ( 12 ), on the side wall panel ( 13 , 14 ) adjacent folding line ( 41 , 42 ) is not equal to the angle, one leg of the fold line ( 50 ) between the triangular field ( 51 , 52 ) and the sealing edge field ( 17 , 18 , 21 ) and the other leg of that of the parallel fold lines ( 53-56 ) are formed in the sealing edge field ( 17 , 18 , 21 ), which starts from the folding line ( 49 ) of the triangular field ( 51 , 52 ) starting from the bottom field ( 13 ) and not adjoining the side wall field ( 13 , 14 ). 5. Lid pack according to one of claims 1 to 4, characterized in that the angles of the two triangular fields, the legs of which are formed by the fold lines ( 41 , 42 , 49 ) extending from the bottom field ( 12 ), are the same. 6. Lid pack according to one of claims 1 to 4, characterized in that the angles of the two triangular fields ( 551 , 552 ), the legs of which are formed by the fold lines ( 541 , 542 , 549 a, 549 b) starting from the bottom field ( 512 ) , are unequal. 7. Lid pack according to one of claims 1 to 5, characterized in that the adjacent folding lines ( 49 ) of the two triangular fields ( 51 , 52 ) starting from the bottom field ( 12 ) coincide. 8. Lid pack according to one of claims 1 to 6, characterized in that the starting from the bottom panel ( 312 ), adjacent fold lines ( 349 a, 349 b) include an in particular isosceles triangular panel ( 300 ). 9. A lid pack according to one of claims 1 to 8, characterized in that the two tips of the bottom panel ( 312 ) touching the triangular panels ( 351 , 352 ) adjoining the side panel panels ( 313 , 314 ) are arranged at a distance from one another. 10. Lid pack according to one of claims 1 to 7 and 9, characterized in that the starting from the bottom panel ( 612 , 712 ), adjacent fold lines of the two triangular panels ( 751 , 752 ) include a square ( 600 , 700 ). 11. Lid pack according to claim 10, characterized in that the square ( 600 ) is a rectangle. 12. Lid pack according to claim 10, characterized in that the square ( 700 ) is a trapezoid.