SE1200506A1 - Method of forming a finishing edge of a package, packaging and a molding tool - Google Patents

Abstract

A method of forming a package (1), comprising the steps of: forming a carton blank (10) into a container having a bottom (13) and one or more side walls (15, 30) extending upwardly from the bottom (13), providing a mold space (32) into which an upper edge (18,38) of said one or more side walls (15,30) extends, the mold space having substantially upwardly extending from the side wall (15,30) whose upper edge (18,30) ) extends into the mold space (32), forming a closing edge (16) by injecting a material into the mold space (32), the closing edge (16) being attached to said one or more carton side walls (15,30) along a contact surface (I) formed by an upper part of said one or more carton side walls (15,30) and a lower part of the formed end edge (16), the material being injected with an injection point (P2) located on an inside of the carton blank, the injection point being located in the vicinity of the upper edge (18,38) of said one or several cardboard side walls (15,30). Selected for publication: fig. 4

Description

A further object of the present invention is to provide a molding tool for use in forming such a package as described above.

According to a first aspect, the present invention is realized by a method of forming a carton, comprising the steps of: forming a carton blank into a container having a bottom and one or more side walls extending upwardly from the bottom, providing a mold space into which an upper edge of said one or more side walls extends, the mold space having substantially an upwardly extending from the side wall whose upper edge extends into the mold space, forming a termination edge by injecting a plastic material into the mold space, the termination edge being attached to said one or more longitudinal carton side walls formed by an upper part of said one or more carton side walls and a lower part of the molded end edge, the material being injected with an injection point located on an inside of the carton blank, the injection point being located near the upper edge of said one or more carton side walls.

The present invention can make it possible to produce a package in which the volume on the closing edge of the package is reduced. Due to the location of the injection point, both the height of the vertical part of the termination edge and the width of any horizontal part of the termination edge can be reduced. By reducing the volume on the closing edge, a more cost-effective packaging can be achieved. The plastic material often has a higher climate impact than the cardboard blank, therefore it is advantageous to reduce the amount of plastic material in a package because less plastic is used and thereby less natural resources are consumed, e.g. oil.

A plastic closing edge enables tight closure of the lid and thus makes it possible to use troughs as MAP (modified atmosphere packaging). A plastic sealing edge can provide a good seal between the edge of the carton and the contents of the package. This is often advantageous because moisture in the package, for example from food or the like, tends to enter the edges of the package and soak the carton so that it loses mechanical strength and has an aesthetically less appealing appearance. A further advantage of using a plastic material may be that the closing edge will be sufficiently rigid to be able to be used as a ridge or top for a snap lock on the lid. The plastic material can be both thermoplastic plastic and / or thermosetting plastic.

In addition, the stability of the termination edge made by this method may still be sufficient to withstand forces acting on it from above or below, making it easy to heat seal or otherwise connect a lid to the top surface of the termination edge. A further advantage of this method can be that the plastic material is injected against the edge of the carton in such a way that the injection force presses the edge of the carton against the wall of the mold, thereby reducing the risk of getting the material on the wrong side of the carton. This can also make it possible to use injection molding where the injection point connects to a side surface of the finishing edge. This in turn makes it possible to design the mold tool in a more compact way.

By placing the injection point on an inside of the carton blank, the injection point will not interfere with any horizontal part of the sealing edge that can be used as part of a seal, separately or integrated with the snap lock. In addition, the injection point will be hidden on the inside of a package produced by the method of the present invention. This can lead to a more aesthetic design of the packaging. the injection point may be located 1-2 millimeters below the upper edge of said one or more carton side walls. The positioning accuracy when forming the carton blank is ~ 1 mm, so to be on the safe side, the injection point needs to be located at least ~ 1 mm below the planned edge. The profile of the closing edge dictates the maximum distance to the cardboard edge, which can typically be 2 mm. In further embodiments, the injection point may be positioned more than 2 mm below the carton edge. the injection point may be located 0.3-2 millimeters from said one or more carton side walls. Preferred distance is ~ 1 mm.

The profile of the termination edge defines the injection point. The thickness of the plastic at the injection point depends on the shape of the trough. The deeper the trough is or the sharper the corners, the more pleated the carton needs to be. The more pleated the cardboard is, the more uneven the upper edge of the side walls, which means that more plastic is needed to cover the cardboard.

According to another embodiment of the present invention, in the step of forming a termination edge, the injection point comprises a plurality of injection points along a circumference near the upper edge of said one or more carton side walls. This can make the production of a package more time efficient because the mold space fills with the injection material faster. Using a plurality of injection points, even distribution of the injected material in the mold space can also be ensured.

According to another embodiment of the present invention, the step of forming the carton blank comprises forming the upper part of said one or more carton side walls, to which the shaped end edge will be attached, in such a way that it forms a continuous straight line. Since the finishing edge material is injected against the carton edge in such a way that the injection force presses the carton edge against the mold wall, no bent carton edge is required to ensure that the carton edge is pressed against the mold wall.

This can simplify the production of the package as no extra production step is needed to create such curved cardboard side walls. An additional advantage may be that a more aesthetic design of the packaging is possible.

According to another embodiment of the present invention, the step of forming the termination edge comprises injecting the material into the mold space via a side-ported hot channel nozzle.

By the term "side ported hot channel nozzle", in connection with the present description, it should be understood that the tip of the nozzle is at an angle relative to the body of the nozzle. This makes it possible to inject the termination edge material into a vertical surface. A further advantage may be that a more compact design of the mold tool is possible because the nozzle body can be placed vertically in the mold tool.

According to a second aspect, the present invention provides a package comprising a carton blank, the carton blank being formed as a container having a bottom and one or more side walls extending upwardly from the bottom, the package further comprising a shaped termination edge attached to said one or more carton side walls. along a contact surface formed by a continuous straight upper part of said one or more cardboard side walls and a lower part of the formed closing edge.

This can simplify the production of the package as no extra production step is needed to create such curved cardboard side walls. Another advantage is that if the bending is excluded, the carton and its plastic coating are not subjected to stresses and the probability of holes in these is reduced. An additional advantage may be that a more aesthetic design of the packaging is possible. Another advantage can be that the volume of the closing edge is reduced, which enables a more cost-effective packaging. The sealing edge material, for example a plastic material, often has a higher climate impact than the cardboard material, therefore it is advantageous to reduce the amount of sealing edge material in a package because less plastic is used and thus less natural resources are consumed, e.g. oil.

Finishing edge material can be both thermoplastic plastic and / or thermosetting plastic.

According to an embodiment of the present invention, the contact surface between a continuous straight upper part of said one or more cardboard side walls and a lower part of the shaped closing edge can be between 2-3 millimeters long. This interval provides a good balance between the strength of the finishing edge and the cost of the material and the climate impact of the finishing edge.

According to another embodiment of the present invention, at least a part of said one or more carton side wall just below the upper part forms a continuous straight line. An advantage may be that a more aesthetic design of the packaging is possible.

The end edge may be provided with a horizontal part extending outwards from the outside of the end edge and with an extension along at least a part of the end edge in a circumferential direction. In this way, the horizontal part can serve as part of a snap lock by holding the closure or lid securely in place on the package. The horizontal part can be divided into different parts, each of which extends only along a part of the circumferential direction of the closing edge. The horizontal part can also be continuous and extend along an entire turn around the opening of the package. Such a horizontal part can be used as part of a seal, separately or integrated with the snap lock.

According to one embodiment, the distance between the horizontal part of the closing edge and the upper edge of said one or more cardboard side walls is between 0.8-3 millimeters. The positioning accuracy in forming the carton blank is ~ 1 mm, so to be on the safe side when the finishing edge is injection molded, a small distance is needed between the horizontal closing edge and the upper edge of said one or more carton side walls. 10 15 20 25 30 35 6 According to another embodiment, the horizontal part is between 0.4-4 millimeters wide. An advantage of having a horizontal part of the finishing edge that is narrower than ~ 4 mm can be that a permanent mold space can be used in the mold tool that forms the package without disturbing the molding process.

This eliminates the need to have a collar ring to form the mold space when the molding process is complete, thus a more cost effective molding tool is possible and consequently a cheaper package can be produced. In another embodiment of the present invention, the termination edge is formed by injection molding on the carton blank with an injection point located to an inside of the carton blank, the injection point being located near the upper edge of said one or more carton side walls.

Due to the location of the injection point, both the height of the vertical part of the termination edge and the width of any horizontal part of the termination edge can be reduced. By reducing the volume on the closing edge, a more cost-effective packaging can be achieved. The plastic material often has a higher climate impact than the cardboard material, therefore it is advantageous to reduce the amount of plastic material in a package because less plastic is used and thereby less natural resources are consumed, e.g. oil. The injection point may comprise a plurality of injection points along a circumference near the upper edge of said one or more carton side walls. Using a plurality of injection points, an even distribution of the injected material can be ensured.

According to a third aspect, the present invention provides a molding tool for use in forming a package, the molding tool comprising a first molding body and a second molding body, the first molding body being substantially cup-shaped and the second molding body being shaped as a protrusion, substantially in accordance with the first mold body, the first and second mold bodies being adapted to together form a mold space for receiving and molding a carton blank into a container having a bottom and one or more carton side walls extending upwardly from the bottom, the mold space being formed on such that there is an enlarged mold cavity portion into them into which an upper edge of the carton side walls has been adapted to extend, the enlarged mold cavity portion being connected to a hot channel nozzle, a termination edge being able to be formed at said 10 15 20 25 30 35 7 one or more carton side walls by injection of a plastic material in the expanded part of the mold space, the plastic material being injected with an injection point located on an inside of the carton blank, the injection point being located in the vicinity of the upper edge of said one or more carton side walls.

The third aspect can generally have the same features and benefits as the first and second aspects.

Other objects, features and advantages of the present invention will become apparent from the following detailed description and from the drawings.

In general, all terms used in the claims are to be construed in accordance with their usual meaning in the technical field, unless otherwise expressly stated herein. All references to "an element, apparatus, component, means, step, etc.]" shall be construed as referring to at least one instance of the element, apparatus, component, means, step, etc. , unless otherwise expressly stated.

The steps of any method described herein need not be performed in the exact order described, unless expressly stated.

Brief Description of the Drawings The above, as well as additional objects, features and advantages of the present invention, will be better understood from the following illustrative and non-limiting detailed description of embodiments of the present invention, taken in conjunction with the accompanying drawings, in which like reference numerals will be used for similar elements, in which: Fig. 1-2 show a package according to an embodiment.

Fig. 3 is a schematic drawing illustrating a conventional injection point.

Fig. 4 is a schematic drawing illustrating an injection point according to embodiments.

Fig. 5 is a schematic drawing illustrating a part of a forming tool in accordance with embodiments, during the process of forming a carton blank into a package.

Fig. 6 is a schematic drawing illustrating a side ported hot channel nozzle according to embodiments. Fig. 7 is a schematic drawing illustrating a part of a forming tool according to embodiments.

Fig. 8 is a schematic drawing illustrating a forming tool according to embodiments. The mold tool is displayed in its open position.

Fig. 9 shows the mold of Fig. 8 in its closed position.

Fig. 10 shows the mold of Figs. 8 and 9 in a position where a dispenser has removed a molded package from the other mold half.

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in more detail with reference to the accompanying drawings, in which embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for accuracy and completeness, and for fully conveying the scope of the invention to those skilled in the art.

An object of the present invention is to reduce the volume of a plastic part, e.g. a closing edge, smooth packaging. Since the material of the finishing edge often has a higher climate impact than a cardboard material, this is advantageous from an environmental point of view. A package with a smaller volume on the closing edge reduces the need for plastic, which means that less natural resources are consumed, e.g. oil. This gives a package according to the invention a lower climate impact. It can also mean that the packaging gets a more competitive price.

The finishing edge can be designed by injection molding on the cardboard blank with the injection point located to an inside of the finishing edge.

By using injection molding, it is possible to create relatively complicated shapes. It is also possible to use the injection molding of the plastic material to securely attach the finishing edge to the cardboard blank. By locating the injection point, the point where the plastic material is introduced into the mold space, to an inside of the end edge, it is possible to place the injection nozzle in a part of the injection molding tool that is not used for a number of other functions. This facilitates the design of the mold tool. The number of injection points may vary depending on needs. In some embodiments there is only one injection point but in other embodiments there are several injection points evenly distributed along the circumference of the carton edge. Figs. 1 and 2 describe a rectangular package 1 with a rectangular bottom 13 and four side walls 15 integrated with the bottom 13 extending upwards from the bottom 13. Figs. 1 and 2 show that the four side walls 15 are in fact shaped as a single continuous side wall 15 with arcuate corner portions and straight portions between the corners. A similarly shaped rectangular package can also be made by folding the corners.

The side walls 15 are provided with a closing edge 16. A horizontal part 12 of a closing edge 16 of the package 1 is 4 millimeters, but according to embodiments of the present invention the width can be as narrow as 0.5 millimeters because the space required for the injection port does not make any demands. on the dimensions of the horizontal part 12 of the closing edge 16 as will be described below. Compare with having the injection position in the corner of the end edge. This would require that the width of the termination edge would need to be at least 7 mm in order to have sufficient space in the corners for the vam channel nozzle and the injection port to fit. According to certain embodiments of the present invention, a space 14 between the horizontal part 12 of the closing edge 16 and an end part 18 of a cardboard blank 10 need only be about 1 mm, as will be described below.

As can be seen in Fig. 4, an injection point P2 is located on the inside of the carton side wall 30. A hot channel nozzle is used to inject the plastic material into a plastic cavity 32. The plastic material is passed through the injection port and into the hot channel where it is injected via the vam channel nozzle. Since the vam channel nozzle is located on the inside of the package, close to the injection point P2, the space required for the injection port does not place any demands on the dimensions of the closing edge, ie. the sealing edge can be designed based on the requirements of the package as such. Of course, the injection port still needs to be fitted with the closing edge, but this is usually not a problem because the total height of the closing edge is sufficient. Compare with the vam channel nozzle was placed on the outside of the package, as can be seen in Fig. 3, with an injection point P1 between an upper edge 38 of the side wall 30 of the carton and a horizontal portion 34 of the plastic cavity 32. This requires that a vertical portion 36 between the upper edge 38 of the carton side wall and the horizontal portion 34 of the plastic cavity 32 be at least 4 mm as this is the space taken up by the injection port. . According to embodiments of the present invention, as visualized in Fig. 4, the vertical portion 36 between the horizontal portion 34 of the plastic cavity 32 and the upper edge 38 of the carton 30 need only be about 1 mm high to bridge the positioning inaccuracy of the carton when forming the carton blank into a container.

Figs. 3-4 also describe how differently placed injection points place different demands on the end part of the carton. In Fig. 3, the injection point P1 is located on an outside of the package. To be sure that the injected material ends up on the right side of the carton side wall 30, e.g. on the inside, the end portion of the carton side wall 30 must be bent so that the bending stress of the end portion of the carton side wall 30 presses the upper edge 38 against the mold wall, which is visualized by the arrow in fig. In Fig. 4, the injection point P2 is described in accordance with an embodiment of the present invention. According to the present embodiment, the injected material is injected near the upper edge 38 of the carton side wall 30, which leads to the injection force pressing the carton side wall edge 38 against the mold wall. This in turn leads to no part of the injected material ending up on the wrong side, e.g. the outside of the carton. Accordingly, there is no need to have a curved or curved end portion on the carton side wall 30. This can simplify the forming of the carton blank into a container. A further advantage is that less plastic may be needed for the lower part of the closing edge, which is clearly visible when comparing Fig. 3 and Fig. 4. The injection point P2 can be placed 1-2 millimeters below the upper edge 38 of the carton side wall 30.

The distance to the carton edge 38 is determined, among other things, by the desired edge profile and positioning accuracy in the design of the carton blank.

Fig. 5 shows a schematic cross-sectional view of a forming tool 50, for forming a package, during the process of forming a carton 58 into a package. The package is formed by moving a core 56 in the direction of a mold space plate 54. While the package is being formed, the carton blank 58 is pressed, on one side by a dispenser 52 and the mold space plate 54, e.g. to the left of the plastic cavity 32 in Fig. 5, and on the other side of the core 56 and the mold cavity plate 54, e.g. below the plastic cavity 32 in Fig. 5. The dimensions of the plastic cavity 32 depend on the desired dimensions of the sealing edge of the package. According to certain embodiments of the present invention, the carton 58 travels over the plastic cavity 32 during molding of the package, and if the cavity 32 is too wide, the molding process is disrupted. This causes the upper part of the edge of the carton blank 58 to become uneven because it is not completely pressed during the molding or in the carton cavity because the edge of the carton blank 58 is placed in the plastic cavity 32 when the molding is finished so that no pressure is applied. on the cardboard edge. In other words, the wider the plastic cavity 32, the longer a portion of the upper edge of the carton blank 58 is formed without holding pressure from e.g. the dispenser 52 and the mold cavity plate 54, for example to the left of the plastic cavity 32 in Fig. 5. Without holding pressure, the formation of the folds can be disadvantageous and the upper edge of the carton blank 58 can become uneven. This can lead to the contact surface I between the plastic and the carton not being filled perfectly and this can lead to the packaging not becoming gas-tight. In the case where the desired finishing edge is 4 mm wide or narrower, this does not pose a problem.

If the desired finishing edge is wider than 4 millimeters, a static plastic cavity, e.g. the plastic cavity 32 in Fig. 5, not an alternative and instead a collar ring is necessary. The collar ring applies pressure to the carton blank during the forming process and is later moved to form a plastic cavity. The width of the edge of a package according to the present invention can be as narrow as 0.5 millimeters as described above. Accordingly, according to certain embodiments of the present invention, the need for a collar ring is eliminated, which in turn facilitates the design of the forming tool 50 and leads to a cheaper forming tool 50 and a simpler forming process.

Fig. 6 shows a side ported hot channel nozzle which can be used for forming the package according to the present invention. A tip of the nozzle 62 is at an angle relative to the body 64 of the nozzle. This makes it possible to inject on vertical surfaces, e.g. on the cardboard side wall 30.

The angle between the tip 62 of the nozzle and the body 64 of the nozzle depends on the type of nozzle used. Since the body 64 of the nozzle may be vertically located in the mold, it is possible to provide the nozzle in a part of the mold which is not provided with a number of other functions. This facilitates the design of the mold tool.

Fig. 7 is a schematic drawing illustrating a portion of the forming tool 50 according to embodiments of the present invention. The carton blank has been formed into a container by the core 56 and the mold space plate 54.

The carton side wall 30 may be between 0.25-0.8 mm thick. The mold space 32 consists of a vertical part 73 and the horizontal part 34. The vertical part 73 can be between 3.6 to 5 mm high and the horizontal part 34 can be between 0.5 mm and 3.5 mm wide. The horizontal part may comprise a projecting part 74 which width may be between 0-3.0 mm. The height 76 of the protruding 10 15 20 25 30 35 12 of the part 74 can be between 0-0.8 mm. The contact surface I between the carton blank 30 and the mold cavity 32 may be between 1-4 mm high and the vertical portion 36 of the mold cavity 32 located between the end of the carton side wall 30 and the horizontal portion of the mold cavity 32 may typically be 1 mm, but the height of the vertical portion 36 varies in practice between 0-2 mm as explained above.

Figures 8-10 show cross-sectional views of the mold 50 for forming the package 1. The mold generally comprises a first mold half or body 80 and a second mold half or body 90. The first mold body 80 is provided with two cup-shaped recesses 83a, 83b. The second mold body 90 is provided with two projections 101a and 101b, as best seen in Fig. 10. When joined together, an upper part of the projections 101a and 101b together with the recesses 83a and 83b form two cavities where the carton blank 10 is adapted to be formed. to a container and to be provided with a closing edge 16 and thereby form the package 1.

The first mold half 80 further comprises a clamping plate 81, an insulating plate 82 and the mold cavity plate 54. The second mold half further comprises the dispenser 52, the core 56, a hot channel nozzle 100a, 100b, a rear mold plate 91, a support plate 92, a pneumatic cylinder 93, a clamping plate 94, an insulating plate 95, an inlet 96 for molding material, a location ring 97, a pipe plate 98 and a hot channel pipe 102.

Package 1 is manufactured in principle as follows.

A flat board blank 10 is placed on top of the first mold half 80 and held in place by vacuum. When the mold is closed, ie. when the two mold halves 80 and 90 are first close to each other, the projections 101a and 101b will push the cardboard blank into the recesses 83a and 83b and thus the flat cardboard blank is formed into a container with a bottom 13 and one or more side walls 15 extending upwards from the bottom 13 Initially, when the projections 101a and 101b push the carton blank into the recesses 83a and 83b, the dispenser 52 is in its forward position, as can be seen in Fig. 8, so that it directs force on the carton blank during molding, e.g. so that folds are formed correctly. During closing of the mold, the dispenser is moved back to its final position as can be seen in Fig. 9. The force from the mold is directed by the pneumatic cylinders 93.

For a container 1 which is circular or elliptical or the like, one usually speaks of a side wall. For a rectangular container or the like, one usually speaks of more than one side wall (for example, four side walls if it is a rectangular container and three if it is a triangular-shaped container 10 15 20 25 30 35 13 container). Note that even in the case of several side walls, they should still preferably be formed in one piece from a single cardboard blank and the connection between the side walls formed as a continuous but sharply curved or pleated part of the cardboard blank. In a sense, it can be said that such a container also has only a single side wall, with this single side wall formed of four identical straight parts and four curved parts or corner parts.

Fig. 9 illustrates the forming tool 50 in its closed position. The recesses 83a and 83b and the projections 101a and 101b are shaped in such a way that when the mold is closed there is a space which is just spacious enough to accommodate the carton blank between them. Which compressive strength is to be used on the carton blank depends, among other things, on which carton material and which design of the container is chosen. Such parameters are well known to a skilled person and will therefore not be described in detail here.

At the bottom of the recesses 83a and 83b, i.e. in the part corresponding to the top part of the side wall 15 of the container, the recesses 83a and 83b and the projections 101a and 101b are designed in such a way that a mold space 32 is formed. The mold space 32 has a complete extent around the circumference of the recesses 83a and 83b. The mold space 32 is intended to be filled with liquid plastic by a so-called injection molding method. Plastic material heated to such a temperature that it is moldable is injected under pressure into the mold cavity 32 and will fill the entire mold cavity 32. The plastic material will thus assume the shape corresponding to the mold cavity 32. Thereafter, the plastic material is cooled to a solid shape which corresponds to the mold space 32.

The plastic material is injected into the mold space 32 by means of the hot channel nozzle 100a, 100b. The hot channel nozzle 100a, 100b is placed in the second mold body 90 on an inside of the mold space 32. Thus, the hot channel nozzle 100a, 100b connects to the cavity 32 so that, seen from the package 1, the plastic material will be injected from an inside of the closing edge.

Suitable molding composition includes various thermoplastics that can be melted. In other words, they can be applied in a molten state to the mold space where they solidify and immediately adhere to the carton blank or to a plastic coating on the carton and at the same time form a rigid closing edge. Suitable polymers which are the basis for these plastic materials are polyolefins, polyesters and polyamides.

Environmentally friendly molding compositions include biodegradable plastic material, for example any of the following: polylactide (PLA), biodegradable polyester, starch-based plastic material or polyhydroxyalkanoate, especially PHB.

By using such materials, the degree of recycling of the packaging can be increased in its entirety, even if the production has taken place partly by injection molding. The above-mentioned biodegradable plastic materials can also be used for surface treatment of the carton blank.

Fig. 10 shows the last step of the manufacturing process of the package. The dispenser 52 is moved to a forward position. In this operation, the dispenser 52 removes the finished package 30 including the closing edge 16 from the projections 101a and 101b. The package 1 is now released and can be removed by, for example, a robot.

Those skilled in the art will appreciate that the present invention is in no way limited to the preferred embodiments described above.

On the contrary, many modifications and variations are possible within the scope of the appended claims. For example, the packages of the present invention may be provided with hooks / openings or hinges on the closing edge.

These additional functions may require additional moving parts of the mold.

Claims (15)

10 15 20 25 30 35 15 PATE NTK RAV A method of forming a package (1), comprising the steps of: forming a carton blank (10) into a container having a bottom (13) and one or more side walls (15,30) extending upwardly from the bottom (13) , providing a mold space (32) into which an upper edge (18,38) of said one or more side walls (15,30) extends, the mold space having a substantially upwardly extending from the side wall (15,30) whose upper edge (15,30) 18,30) extends into the mold space (32), forming a sealing edge (16) by injecting a material into the mold cavity (32), the sealing edge (16) being attached to said one or more carton side walls (15,30) along a contact surface (l) formed by an upper part of said one or more carton side walls (15,30) and a lower part of the formed end edge (16), the material being injected with an injection point (P2) located on an inside of the carton blank, the injection point being located near the upper edge (18,38) of the board a one or more cardboard side walls (15.30). A method according to claim 1, wherein the injection point (P2) is located 1-2 millimeters below the upper edge (18,38) of said one or more carton side walls (15,30). A method according to any one of claims 1-2, wherein the injection point (P2) is located 0, 3-2 millimeters from said one or more carton side roads (15,30). A method according to any one of claims 1-3, wherein the injection point (P2) in the step of forming the termination edge (16) comprises a plurality of injection points along a circumference near the upper edge (18,38) of said one or more carton side walls (15,30 ). A method according to any one of claims 1-4, wherein the step of forming the carton blank (10) comprises forming the upper part of said one or more carton side walls (15,30), to which the shaped end edge (16) will be attached, so as to in such a way that it forms a continuous straight line in a cross section parallel to a normal to the bottom (13). 10 15 20 25 30 35 16 A method according to any one of claims 1-5, wherein the step of forming the termination edge (16) comprises injecting the material into the mold space (32) via a side ported hot channel nozzle (72,74). A package (1) comprising a carton blank (10), the carton blank (10) being formed as a container having a bottom (13) and one or more side walls (15, 30) extending upwardly from the bottom (13), wherein the package (1) further comprises a shaped sealing edge (16) attached to said one or more carton side walls (15,30) along a contact surface (I) formed by a continuous straight upper part of said one or more carton side walls (15,30) and a lower part of the shaped end edge (16). A package (1) according to claim 7, wherein the contact surface (I) is between 1-4 millimeters long, preferably between 2-3 millimeters long. A package (1) according to any one of claims 7-8, wherein at least a part of said one or more carton side walls (15,30) just below the upper part, in a cross section parallel to a normal to the bottom (13), forms a continuous straight line. A package (1) according to any one of claims 7-9, wherein the closing edge (16) is provided with a horizontal part (12) extending outwards from the outside of the closing edge (16) and with an extension along at least a part of the closing edge (16). ) in a circumferential direction. A package (1) according to claim 10, wherein the distance between the horizontal part (12) of the closing edge (16) and the upper edge (18,38) of said one or more cardboard side walls (15,30) is between 0.8-3 millimeters. A package (1) according to any one of claims 10-11, wherein the horizontal part (12) is between 0.4-4 millimeters wide. A package (1) according to any one of claims 7-12, wherein the closing edge (16) is formed by injection molding on the carton blank (10) with an injection point (P2) located on an inside of the carton blank (10), wherein the injection point (P2) is located in the vicinity of the upper edge (18,38) of said one or more carton side walls (15,30). A package (1) according to any one of claims 7-13, wherein the injection point (P2) comprises a plurality of injection points along a circumference near the upper edge (18,38) of said one or more carton side walls (15,30). A mold tool for use in molding a package, the mold tool comprising a first mold body (80) and a second mold body (90), the first mold body (80) being substantially cup-shaped and the second mold body being formed as a protrusion, substantially in accordance with the first mold body, the first and second mold bodies being adapted to together form a mold space for receiving and molding a carton blank (10) into a container having a bottom (13) and one or more carton side walls (15). , 30), which extend upwards from the bottom (13), the mold space being formed in such a way that between them there is an extended mold space part (32) into which an upper edge of the cardboard side walls (15, 30) has been adapted to stretch wherein the enlarged mold cavity part (35) is connected to a hot channel nozzle (100a, 100b), wherein a closing edge (16) can be formed fixed to said one or more cardboard side walls (15, 30) by injection. of a plastic material in the expanded part (32) of the mold space via the hot channel nozzle, the plastic material being injected with an injection point (P2) located on an inside of the carton blank, the injection point being located near the upper edge (18, 38) of said one. or several cardboard side walls (15.30).