SE516292C2 - Packaging composed of a bottom inner part and a bottom outer part - Google Patents

Abstract

Package made of corrugated board and consisting of a bottom-provided inner part (10) and a bottom-provided outer part (11), especially suitable as a package for shipping fish. These parts are dimensioned so that together they afford a strong package with multi-layer walls, and they are obtained from plane blanks which are punched out in one piece and provided with fold lines. The ends of the package consist of three layers (g, g1, g2') of corrugated board and include a first (g1) and a second (g2') wall panel constituting part of the outer part (10). The third layer is formed by a wall panel constituting part of the bottom-provided inner part (10) and is arranged between the said first and second wall panels. At the top, the first and second wall panels are held at a distance from each other by means of an essentially horizontal transition portion (g2'') formed in one piece with these wall panels. The said first (g1) an second (g2') wall panels form between them a space leading down towards the bottom of the assembled package, and the second wall panel (g2') is fixed to the inner bottom (b) of the assembled package.

Description

25 30 516 292 The three gift | de | fe | are | laid close together and the outer subfield has an elongated portion that is folded over the top edge. Tabs in handle openings in the inner and middle subfields are, like a tab in the extended portion, inserted into a locking opening in the outer subfield and keep the outer part in an upright condition. The inner part and the outer part are held together by a fl ik in each outer end part of the outer part extending through the respective handle opening and by friction directly abutting against the respective end side of the inner part.

The package made of corrugated board composite corrugated board known from U.S. Pat. No. 4,046,309 is complicated in terms of manufacture.

Industrial production of the complicated substances that make up the starting material for the inner part, outer part and lid requires sophisticated and thus expensive machinery. Manufacturing, and in principle also the use of the material, can only take place where such machinery is available, or at a limited distance from it. The reality is that, for economic reasons, it is not possible to transport pre-punched blanks to corrugated board transport packaging over longer distances from the place of manufacture of packaging materials to end users.

As is well known, food distribution is a global problem. Food is produced and / or available as a natural resource in many parts of the world, but unfortunately in many such places there are no resources or conditions for more extensive investments, such as those that would be required for industrial production of transport packaging according to what is known from the US 4 046 309.

Another problem with the distribution of food, for example distribution by air freight, is that it is required that the distribution packaging is liquid-tight. The package known from US 4,046,309 is intentionally designed to dispense melt water from ice used for cooling the transported product. For this purpose, there are drainage openings in both the inner part and the outer part. In addition, the construction of the inner part, which in principle is a so-called. slot box also has no possibility of achieving either liquid or vapor tightness. The inner part (slot box) of the known construction is also not replaceable with other construction, since according to the description in the patent specification it is a necessary ingredient to allow »10 15 20 25 30 516 292 to enable subsequent refilling of ice as this is required. The filling operation is performed so that the lid is first removed, the composite package is turned upside down, the outer part is removed, after which the bottom closure of the slit box (inner part) is opened up and new ice is inserted into the bottom of the inner part, after which restoration to initial condition takes place in reverse order.

In addition to the mentioned problems with complicated, expensive production equipment, non-optimal utilization of strength obtainable with corrugated board, problems with transport when the mode of transport requires liquid tightness, further problems arise with the construction according to US 4,046,309 when high barrier properties are required, e.g. ex. water vapor tightness, which is impossible to achieve with the known construction.

This cannot be used or modified to give the packaged product a longer shelf life than can be achieved with ice cooling.

A further example of a transport packaging of corrugated board can be found in German OS 2 262 539. This packaging is intended for fresh fish and is a single-layer construction of heavily corrugated board. The package is specially designed to enable meltwater to drain from ice. The construction lacks the prerequisites for achieving barrier properties. Japanese patent publication 10-273131 describes a single-layer transport trough for fresh fish made of corrugated board. The construction is based on the traditional trough construction in solid cardboard technology with surface-mounted so-called delta corner flaps, which are formed in one piece with associated gable and side wall panels and thus do not expose any cut edges towards the interior of the trough. The single-layer construction of corrugated board requires strong material to provide the required strength, especially as co-orientation of the longitudinal direction of the corrugations is possible only in two opposite sides of the trough erected from the planar blank. The trough has a lid that is pressurized on the top of the trough and is held in place by elastically resilient handles on the trough ends. The contact surface between the lid and the trough top is small, especially along the long sides. Liquid, and in particular vapor-gas-tight closure is thus practically impossible to achieve. s »u- e 10 15 20 25 30 516 292 In the field of solid board technology, there are a number of different constructions, partly consisting of inner and outer parts, but not intended to form strong transport packages, nor possible to seal / seal to liquid and vapor tight condition.

For example, U.S. Pat. The construction thus has a single layer of solid cardboard as the bottom. Because the end flaps of the trough are extended, you get three layers of material in the ends. The banner forms the middle layer and the trough is kept in an upright condition with the help of ears on the extended end flaps. These ears are brought into locking engagement with punches in the edges of the side walls.

OBJECT OF THE INVENTION An object of the invention is to use a corrugated board as a material for a package, to achieve a strong packaging construction, which is possible to produce industrially with relatively simple production machines, and in addition through its basic construction can be made liquid and vapor tight.

A further object is to provide an improved, affordable alternative to the initially mentioned transport packages intended for fresh fish, the improvement eliminating the shortcomings specified for the known constructions. Another purpose is to provide a transport package that meets high requirements for transportability, including requirements for air transport.

The purpose is ultimately to geographically approximate the production source for packaging materials and the production source for the product to be packed in the transport packaging.

THE INVENTION Said objects of the invention are achieved with a packaging construction of the general kind which appears from the preamble of the appended claim 1 and with the features stated in the characterizing part of said claim. further 10 15 20 25 30 516 292 Further developments of the basic concept according to the said requirements and preferred embodiments appear from the subclaims.

BRIEF DESCRIPTION OF THE RELATIONS Fig. 1a-1c Fig. 1d Fig. 2a-2c Fig. Zu Fig. 3a-3c Fig. 3d Figs. of the invention, is a section through the sealed and sealed package according to the first embodiment and shows the principle of the gable construction of the package, shows sub-elements and erection parts which give a package composed of inner part and outer part according to a second embodiment of the invention, is a section through the closed and sealed package according to the second embodiment and showing the principle of the gable construction of the package, showing sub-elements and erection sub-elements which give a package composed of inner part and outer part according to a third embodiment of the invention, is a section through the closed and sealed the package according to the third embodiment and shows the principle of packaging Fig. 4d is a section through the closed and sealed package according to the invention. fourth embodiment and shows the principle of the gable construction of the package, Fig. 5 shows a flat blank intended to form the outer part of the composite package, and Fig. 6 shows a flat blank for the inner part of the composite package according to Figs. 2-2d.

DESCRIPTION OF EMBODIMENTS Figure 1a shows a sub-element of a composite package. This sub-element constitutes an inner part 10 in the form of a trough raised from a flat blank of corrugated board. With the exception of long side flap fields, the blank has the same configuration as the blank in Figure 6, i.e. the blank for the inner part in figure 1a comprises a bottom wall panel b, opposite pairs of long side wall panels I, opposite pairs of short side or end wall panels g and corner panels c1, c2. These fields are formed in a blank punched out of corrugated board whose corrugations in the longitudinal direction are oriented as shown by the lines D and are connected to each other via bigan instructions or lines of weakness w1-w7. As can be seen from Figure 1a, the corner fields c1, c2 of the raised inner part are placed externally towards the associated card or end sides and thus give a smooth inside, at the same time as the partial fields through their so-called delta corner construction provides tightness and does not expose any free cut edges to the interior of the inner part. In the case of the raised inner part, the longitudinal direction of the corrugations in the short sides or ends is substantially vertical as indicated by the lines D. Depending on the requirements for tightness, the corrugated board material used for punching blanks can be coated, single-sided or double-sided with a suitable thermoplastic material, for example polyethylene, polypropylene or equivalent to provide liquid tightness and a certain vapor barrier.

More sophisticated coating materials can also be used if necessary if a higher degree of barrier is desired, especially when the inner part is provided with long-side wall flaps (eg according to Figures 2a-2d). Figure 1b shows a sub-element of the composite package in the form of an outer part 11. This outer part is raised from a flat blank of corrugated board. Subject »10 15 20 25 30 516 292: net is in its basic configuration a substance for a so-called slot box and is punched out with the same simple punching technique used for such, which together with the uncomplicated punching of the inner part in figure 1a, gives an overall concept well adapted to production facilities with traditional equipment. The blank for the outer part of Figure 1b, as well as for the outer parts of the other embodiments shown, is shown in Figure 5. It comprises side walls forming fields g1, I1, bottom forming fields or flaps b1, b2, top forming fields or flaps t1, a joint fields f and fields or flaps g2 intended for special purposes as will be described later. The blank is punched from corrugated board material with the longitudinal direction of the corrugations oriented as shown by lines D. The left panel l1 in Figure 5 is connected to associated top-bottom panels or flaps and the panels g1 via start-up or weakening lines w8-w11. The right field l1 is connected to the associated top-bottom field or flaps and the right field g1 via bending or weakening lines w8. w10 and w11. The joint flap f is traditionally intended to be folded around its bending line w9 and when folding the blank around the second bending line w9 is fastened, e.g. glued, to the side of the right panel 11 in Figure 5 which is intended to form the inside of the raised outer part 11.

The fields b1, b2 and t1 and g2, respectively, have also been called flaps, due to the simple reason that in the planar state of the blank in Figure 5 they are mutually separated by slits. In the embodiment shown in Figure 5, these slits extend from the respective intended line, which is defined by the flaps t1, g2 and b1, b2 free, bounding edges d1 and d2, respectively, lying at the same level perpendicular to the level of the respective set of bending lines w8, w12 and w10, w13. For reasons which will become apparent later, in certain embodiments the slits between the flaps t1 and g2 should have a width at least equal to the material thickness of the part forming the inner part of the composite package. In the embodiment shown in Figure 5, the side wall panels g1 are intended to form the ends or short sides of the outer part. In fields g1 there are punch lines and weakenings h, intended to form carrying handles for the composite package. The vertical height of the outer part 11 is determined by the distance between the sets of starting lines w8, w12 and w10, w3, respectively. As previously mentioned, the flaps g2 and t1 in the embodiment of Figure 5 are of the same length, which is advantageous from a production point of view, but not an absolute condition. For reasons which will appear later, on the other hand, it is essential that the flaps g2 have a length which is greater than the vertical, internal height of the outer part 11 minus the material thickness of the inner part. In each flap field g2, a bending or weakening line w14 is formed parallel to the line w12. The distance perpendicular from the line w14 to the free end edge d1 of the flap g2 is at least equal to, preferably greater than the distance between the lines w12 and w13 minus the material thickness of the inner part 10.

Between the lines w12 and w14 a first sub-area g2 "is formed by each flap field g2.

These sub-areas, as well as the sub-areas g2 'between the bending lines w14 and the end edges d1, are of significant importance for the packaging construction as a whole, as will be seen later.

After the sub-elements included in the embodiment according to Figures 1a-1d have now been described, a description will be made of the package consisting of inner part and outer part according to Figures 1a-1d. in the raised and bottom-sealed outer part. The bottom closure of the outer part can be made in the traditional way, e.g. with tape or staples. The inner part has a height substantially corresponding to the outer part. The side edges s' of the opposite gable flaps g2 of the outer part which, due to the location of the slits s and the bending line w9, are slightly retracted in relation to the insides of the side walls l1, allow the flaps g2 to fold towards the bottom b b of the inner part 10, first around the lines w12 and then around the lines w14. By dimensioning each length of the flap g2 between the line w14 and the end edge d1 of the flap in the manner indicated, the end edge d1 of each flap g2 can be snapped past an unstable position, where the sub-area g2 'is substantially vertical, to a stable position according to Figure 1d. In this position the inner part 10 is kept stable and fixed to the bottom of the outer part. ||: »| A cavity is formed between each flap g2 and the associated end panel g1. The flap and gable field form in principle a stable hollow beam. Since the longitudinal direction of the corrugations in the material in the end panel g1 and the part g2 'are co-oriented, i.e. vertical, a construction is obtained that can withstand high vertical loads. In addition, there is a contribution from the end part g of the inner part, which also has the longitudinal direction of the corrugations oriented vertically.

The beam structure at each end also has a substantially horizontal and very stable transition portion g2 '". This batch is used to in the transverse direction of the composite package, i.e. along the gable, seal the longitudinal side flaps t1 against the beam surfaces g2 '”. Longitudinally, the flaps t1 are sealed in an overlapping area t1 '.

The seal can be obtained very tightly and can be made by heat sealing of sealable thermoplastic material, which has been pre-coated on the material, or another type of seal can be used, e.g. using hot melt, cold sealing glue or tape.

In some applications, a tighter seal may be required than is possible in the embodiment of Figures 1a-1d. Such an embodiment is shown in Figures 2a-2d.

The difference with respect to the exemplary embodiment in Figures 1c-1d is that the inner part is provided with longitudinal side flaps c1. Otherwise the outer part is unchanged and the arrangement of flaps is effected by slits, giving in the same way as before the possibility of placing the inner part in the outer part and then folding or folding down the flaps g2, in this case with the difference that the long side flaps cl extend up from the inner part 10 and gives edge areas cl '. It should be noted that each longitudinal side flap c1 has a longitudinal extent equal to the inner length of the longitudinal wall l1 of the outer part. As a result, the long side flap of the inner part will extend all the way to the corners of the composite package.

With the edge areas c1 ', the longitudinal side flaps c1 of the inner part are sealed against the horizontal transition area g2 "and the flaps c1 are mutually sealed in an overlap area c1".

In the exemplary embodiment according to Figures 2a-2d, the inner part is made of the blank shown in Figure 6. Although such a blank provides optimal tightness and is otherwise easy to handle, however, other variants of inner parts and blanks for such parts are possible. Thus, Figures 4a-4d show a variant of the inner part where the longitudinal side flaps c1 are slightly shortened in relation to the longitudinal side flaps according to Figures 2a-2d extending out into the corners of the composite package. In addition, the long side flaps are of different mutual lengths. In other respects, the construction corresponds to what has been described previously, however, in the same way as in Figures 1a-1d, the horizontal transition areas g2 "are used only for sealing the long-walled flaps t1. -1d.

Finally, in Figures 3a-3d there is another variant of the inner part. This then has only a longitudinal side flap c1, and this is of shorter length than the inner wall 11 and is thus also not sealable against the horizontal transition areas g2 "of the beam constructions in the composite package.

With the described embodiments, a strong packaging construction of corrugated board can be manufactured with simple means of production and which, due to its basic construction, is well suited as liquid and vapor-tight transport packaging, e.g. for fresh fish. The packaging also meets high requirements for transportability, including transport by air, and is thus applicable to food products that require fast handling. At the same time, however, the shelf life of packaged foods can be significantly extended by appropriately coating the corrugated material with some barrier material. Since the packaging can be made tight due to the unique sealing possibilities, such a coating with a barrier against water and steam-creating material is completely defensible. Although the invention has been described with reference to exemplary embodiments, it will be understood that further alternatives and modifications are possible, and that the invention is limited only by what is stated in the appended claims.

Claims (8)

10 15 20 25 30 516 292 11 un. o: PATENT REQUIREMENTS Packaging made of bottomed inner part (10) and bottomed outer part (11), where both parts consist of corrugated board and are dimensioned together to give a composite, strong packaging with multilayer walls (l, I1; g, g1 , g2 ') and multi-layered bottom (b, b1), and where each of the parts is raised from folded instructions (w1-w7, w8-w14), flat, one-piece punched blanks, and at least a pair of substantially vertical , opposite side walls of the composite package comprise three layers of corrugated board (g, g1, g2 '), including a first (g1) and a second wall panel (g2') forming part of the outer part, and which are held at a distance from each other by a , formed in one piece with these wall panels, substantially horizontal transition portion (g2 "), characterized in that the third layer (g) is formed by a third wall panel, constituting a direct continuation of the bottom of the bottomed inner part (10) and arranged between said first oc h second wall panel, and that said first (g1) and second (g2 ') wall panels, down towards the bottom of the composite package, between them form a cavity occupying said third wall panel, and that the second wall panel (g2') is fixed to the the inner bottom of the composite package (b). Packaging according to claim 1, characterized in that the substantially horizontal transition portion (g2 ") extends between a pair of mutually parallel folding directions, a first (w12) of these coinciding with said vertical side wall (g1). upper boundary edge, and the vertical between the second folding guide (w14) and the inner bottom (b) of the inner part (10) is defined a distance which is less than the length of the second wall panel (g2 ') perpendicular to said second folding guide (w14). Packaging according to claim 2, characterized in that said at least a pair of substantially vertical opposite side walls (g, g1, g2 ') form the short sides of the composite package, that the outer part (11) on opposite long sides is provided with each other overlapping longitudinal side flaps (t1) extending longitudinally substantially up to one of said first fold directions (w12), respectively, and said flaps being sealed longitudinally to each other in the overlapping area (t1 ') and in transverse seals to each of the said transition parties (g2 ”). Packaging according to claim 3, characterized in that the inner part (10) is designed as a tight inner package, completely missing free, inwardly facing cut edges, e.g. in the form of an inner part with externally placed delta corner fields (c1, c2). 5. A package according to claim 4, characterized in that the material of the inner part is coated with a vapor and liquid barrier having thermoplastic, at least on the side thereof facing inwards. Packaging according to any one of claims 3-5, characterized in that the inner part (10) on opposite sides is provided with overlapping longitudinal side flaps (cl) with an extension in longitudinal direction substantially up to each of one of said first folding instructions (w12), respectively. , and that said flaps are sealed to each other longitudinally in the overlapping area (c | ") and transversely sealed to said respective one of the transition portions (g2"). Packaging according to one or more of Claims 1 to 6, characterized in that the inner part and / or the outer part are coated with heat-sealable thermoplastic material, at least in the said transition portions (g2 ") and on any overlapping wall-bottom flaps intended for sealing. some of claims 1-7, Packaging according to any one or the like that the outer part is made in the form of a so-called slot box.