Packaging bag with thermal insulation

Abstract

The invention relates to a packaging bag with a back part (1) and a front part (2), preferably each being made entirely or at least predominantly of paper, which are joined to each other by adhesive at the sides, and with whose lower end regions a bottom is formed, preferably also which are joined by adhesive at their lower end regions, wherein in the region of the upper end of the front part (2) an opening (4) which can be closed with a flap (13) is formed between the front part (2) and the back part (1), wherein the back part (1) comprises an overhanging area (1a) which has no connection to the front part (2) at the sides and which comprises the flap (13) which can be folded towards the front part (2), preferably which can be secured by means of an adhesive strip, wherein a thermal part (5) is provided which is folded around the lower end regions (9) and covers the front part (2) and back part (1) at least partially.The invention also relates to a method for its manufacture.

Description

[0001] The invention relates to a packaging bag with a back part and a front part, preferably each being made entirely or at least predominantly of paper, which are joined to each other by adhesive at the sides, and with whose lower end regions a bottom of the packaging bag is formed, preferably which are also joined by adhesive at their lower end regions, wherein in the area of ​​the upper end of the front part an opening is formed between the front part and the back part which can be covered by a flap, wherein the back part includes an overhanging area which has no connection to the front part at the sides and which includes the flap which can be folded towards the front part, preferably which can be secured by means of an adhesive strip.

[0002] The invention also relates to a method for manufacturing a packaging bag with thermal insulation, in particular a packaging bag with a thermal part, which surrounds a front part and a back part with a flap-forming overhang area, at least partially, which in the area of ​​their overlap define a receiving area for goods.

[0003] The front and back parts are preferably planar, in particular arc-shaped elements, preferably partially folded elements, preferably made entirely or at least predominantly of paper or of a composite material comprising paper.

[0004] The lateral connection, and preferably a connection at the lower end regions between the front and back sections, is located in an area of ​​the packaging bag where goods can be inserted into the interior. The volume of the packaging bag is defined by the laterally and preferably bottomally connected areas, particularly those bonded with adhesive, as well as by the top opening.

[0005] The bottom of the packaging bag is formed at the lower end of the front and back parts. In the invention described here, the front and back parts can preferably be adhesively joined at this point; however, this is not strictly necessary. For example, the two parts can also be held in contact with each other without adhesive, which allows for a closed bottom.

[0006] The overhang area of ​​the back piece is an area of ​​the back piece that is not covered by the front piece; in particular, the overhang area has no connection whatsoever to the front piece.

[0007] In particular, the overhang extends upwards beyond the upper end of the front section, and thus also beyond the opening, at least when the flap is not folded over to cover the opening. Preferably, the fillable volume of the packaging bag is therefore not limited by this overhang, or, when the opening is covered, only limited upwards.

[0008] A packaging bag according to these characteristics is known from publication DE 10 2022 131 182 A1 of the same applicant.

[0009] The problem with this type of packaging bag is that when filling it with hot goods, such as food, the user's fingers may be exposed to high temperatures, which can make handling the bag uncomfortable depending on the temperature level.

[0010] It is therefore an object of the invention to further develop a packaging bag of the type mentioned above in such a way that its use with hot goods, such as food, is improved. A further object of the invention is to be able to keep a hot product warm more effectively.

[0011] This problem is solved by the packaging bag comprising a thermal insert which is folded around the lower end regions of the front and back sections and which at least partially covers the front and back sections. Preferably, the thermal insert is partially adhesively bonded to the front and back sections, in particular by forming an integral, non-removable part of the packaging bag.

[0012] Preferably, the thermal element extends from the bottom of the packaging bag to the rear and / or front over more than 50%, preferably more than 70%, of the total height of the packaging bag. The rear extension is preferably higher than the front extension.

[0013] Preferably, a thermocouple is understood to be an element, in particular a planar arc-shaped element, preferably made of the same material as the front part and / or back part, which, by its presence alone and / or in combination with other elements, such as the front part and / or back part, provides improved thermal insulation compared to a packaging bag without such a thermocouple.

[0014] Preferably, the invention achieves the creation of an air layer between the thermal element and the back section and front section it covers, which provides an insulating effect in addition to the thermal element itself. For this reason, it is particularly intended that the thermal element is not bonded to the back section and / or front section over its entire surface, but only in certain areas, in order to allow for the existence of an air layer.

[0015] A user who grasps the packaging bag does not directly touch the front and back parts due to the covering of the thermal part, but only indirectly via the thermal part, which means that the user's fingers are exposed to less heat from warm contents in the bag because the thermal part and preferably the enclosed air layer have a thermally insulating effect.

[0016] A preferred further development provides that in a state in which the flap covers the opening, in particular folded towards the front part, the flap also covers at least part of the area of ​​the thermal part covering the front part.

[0017] Preferably, this achieves the effect that, even when the packaging bag is closed, for example when the user is carrying a hot meal, an additional insulating layer of air is trapped between the flap and the thermal insert, and preferably the flap itself also has an insulating effect. Preferably, the flap, when covering the opening, may have a height between its fold axis and the opposite lower edge that is at least 50% of the total height of the packaging bag.

[0018] The invention preferably provides that the portion of the thermal element covering the front part is bonded to the front part at its upper edge across the entire width of the packaging bag. Alternatively, but also cumulatively to the aforementioned feature, it is preferably provided that the portion of the thermal element covering the back part is bonded to the back part at its upper edge across the entire width of the packaging bag in an adhesive area. This prevents convective escape of the air layer upwards from the area between the thermal element and the front part or between the thermal element and the back part of the packaging bag, thus improving the insulation effect.

[0019] The invention may also preferably provide that a pocket, in particular an upwardly open pocket, is formed between the part of the thermal part covering the front part and the front part and / or between the part of the thermal part covering the back part and the back part.

[0020] In particular for this purpose, but also independently of the aforementioned design, it may be provided that the part of the thermal part covering the back part and / or the part of the thermal part covering the front part has no adhesion to the back part at its upper edge, at least in some areas, in particular over the entire width or at least over the predominant width of the packaging bag.

[0021] A pocket formed in this way, especially one open at the top, can be filled with, for example, a napkin.

[0022] Preferably, this achieves a further improvement in heat insulation when selling a hot meal by including a napkin in this bag.

[0023] Furthermore, it may preferably be provided that the part of the thermal part covering the front part is completely or only partially bonded to the front part at its lateral edge, and / or that the part of the thermal part covering the back part is completely or only partially bonded to the back part at its lateral edge, in particular that unbonded areas are arranged around at least one bonded area at the lateral edge.

[0024] However, it is also possible to glue the thermal part and the front part laterally over the entire height of the section of the thermal part that covers the front part, or to glue the thermal part and the back part laterally over the entire height of the section of the thermal part that covers the back part, thereby forming a pocket that is at least laterally closed with an enclosed layer of air, or even forming a completely closed chamber with enclosed air, if, in addition, the section of the thermal part covering the front part is glued to the front part at its upper edge over the entire width of the packaging bag and / or if the section of the thermal part covering the back part is glued to the back part at its upper edge over the entire width of the packaging bag.

[0025] A preferred embodiment provides that the front part is folded around the lower end of the back part at its lower end. Preferably, the front part is glued to the back part at this folded end. This fold of the front part is preferably located within the fold of the thermal part, by which the thermal part is folded around the lower end of the front and back parts.

[0026] It is further preferably provided that the fold of the front part includes a fold, preferably a glued fold, of the lower end region of the back part, enclosed in itself. Here, the front part is preferably glued to the self-folded area of ​​the back part at its end.

[0027] It is preferably provided that the folded end of the front section terminates at the same height as, or below, the folded-over section of the back section, or extends above the end of the folded-over section of the back section. In any such extending area, the folded end of the front section can then be, for example, adhesively attached to the back section above the folded-over section of the back section.

[0028] All of the aforementioned folds, in particular those carried out in the area of ​​the bottom of the packaging bag, can preferably be carried out around the same fold line.

[0029] The aforementioned problem is solved in a process for manufacturing a packaging bag by first providing a single sheet of material from which the packaging bag is made.

[0030] It is then provided that the sheet is divided between two opposite ends into a first end-side partial sheet, a second end-side partial sheet and an intermediate sheet lying between the two end-side sheets, e.g. by cutting, wherein the divided components of the sheet form the thermal part, the front part and the back part, in particular wherein the first end-side sheet forms the thermal part, the second end-side sheet forms the back part with overhang area and the intermediate sheet forms the front part.

[0031] In particular, the splitting takes place across the full width of the arc in a direction perpendicular to the direction of the spacing between the opposite ends of the arc.

[0032] Preferably, the thermoformed part thus formed has a greater length than the front part and a shorter length than the back part with overhang area, in each case considered in the direction of the spacing of the original ends of the arc.

[0033] The process then further involves placing the front part onto the thermal part with adhesive areas in between, forming a partial area of ​​the thermal part not covered by the front part, and placing the back part with an overhang area onto the front part with adhesive areas in between, forming a partial area of ​​the back part not covered by the front part, which forms the overhang area, thereby positioning the front part between the thermal part and the back part.

[0034] The two steps of placing the device can be performed in any order.

[0035] When the front part is placed on the thermal part, a partial area of ​​the front part not covered by the thermal part is preferably also formed, which is smaller than the partial area of ​​the thermal part not covered by the front part.

[0036] The adhesive areas between the thermal insert and the front part preferably comprise an adhesive bead that extends across the entire width of the thermal insert along its edge region, which is completely covered by the front part and / or which is located near the future opening of the packaging bag. More preferably, at least one adhesive area is provided on each of the two lateral side regions between the thermal insert and the front part that are opposite each other in the width direction.

[0037] When placing the back part with overhang onto the front part, preferably an area of ​​the front part not covered by the back part is also formed, which is shorter than the overhang area.

[0038] The adhesive areas between the thermal insert and the backing layer are preferably positioned such that the front and backing layers are joined in their overlapping area at the future side edges of the packaging bag, particularly over the majority or entire height of the side edges. Preferably, a single adhesive strip is used on each side edge.

[0039] Preferably, the two aforementioned uncovered sub-areas are arranged on opposite sides of the front part or border on opposite edges of the front part, which are spaced apart in the direction of the spacing of the original ends of the arc.

[0040] Furthermore, the method involves adhesively attaching the portion of the thermal insert not covered by the front part to the back part, forming a fold at least within the thermal insert. This ensures that the thermal insert encloses the front and back parts around the bottom of the packaging bag. Preferably, the fold is formed in such a way that it surrounds what will later become the bottom of the packaging bag.

[0041] Preferably, the adhesive attachment of the thermal part to the back part is only carried out in certain areas of the future side edge of the packaging bag, so that a pocket is formed, especially one open at the top, which was previously designated, for example, to hold a napkin.

[0042] A preferred further development of the method provides that when the fold is formed in the thermal part, a fold is also formed in the front part, in particular in a part of the front part not covered by the back part, which represents an end area of ​​the front part that is close to or forms the later bottom of the packaging bag.

[0043] It is further preferred that the part of the front part not covered by the back part is bonded to the back part by adhesive, in particular over the entire width.

[0044] It is preferably further developed that when the fold is formed in the thermal part and the fold in the front part, a fold is also formed in the back part, with which the back part is folded onto itself, and in particular also glued onto itself.

[0045] Particularly preferably, all folds that lie in the folding of the thermal part are formed around the same folding axis and preferably simultaneously in the same folding process.

[0046] The invention may preferably provide that, in order to bring the packaging bag into a delivery state, the overlapping area forming the flap is folded onto the part of the thermal part covering the back part.

[0047] The fold line of the flap-forming extension is particularly preferably located at a distance from the opening, especially at a distance that allows the packaging bag to be grasped by hand in the space between the flap and the opening when the opening is not covered, preferably without inserting a finger through the opening into the interior of the packaging bag. Preferably, this distance is more than 2 centimeters, more preferably more than 3 centimeters.

[0048] Exemplary embodiments of the invention are described with reference to the following figures. Figure 1 shows: a packaging bag according to the invention in a side section through the plane of the side area where an adhesive bond is present; Figure 2 shows: the method for manufacturing the bag in several steps.

[0049] In the lateral section of the Figure 1 and 2 The distances shown between the elements described below do not exist in the actual packaging bag and are only used here to make some elements clearer. All directional terms mentioned before and after, such as top, bottom, or side, refer to a packaging bag configuration in which the opening is positioned above the bottom of the bag.

[0050] The Figure 1Figure 1 shows a back part 1 and a front part 2, which are joined at their side edges by means of an adhesive area 3 located between these parts in the vertical direction of the packaging bag. It is preferably provided that this adhesive area 3 extends from the lower end of the front part 2 and back part 1 to their ends.

[0051] A receiving area is formed between the parts thus connected, which serves to receive a heated item (not shown here).

[0052] The receiving area is open at the top at opening 4 and closed at the lower end of back part 1 and front part 2 by a base area 9, in which front part 2 and back part 1 at least make contact and are held in contact with each other. These parts may preferably be glued together at their lower end areas, but this is not mandatory.

[0053] The parts can also be held in contact additionally or solely by folding the front part 2 at its lower end towards and around the back part 1, and stabilizing this fold by incorporating it into a fold above or around it. Adhesive bonding can preferably be provided as an additional measure.

[0054] Here, the end of the folded-over front section 2 is adhesively attached to a folded-over end of the back section 1, in particular in an adhesive area 10 extending across the full width of the packaging bag. The adhesive area 10 can extend into the lateral adhesive areas 3 if these – as described above – extend to the respective ends of the front section 2 and back section 1. The folded-over end of the back section 1 is preferably adhered in the fold to an adhesive area 16. This can preferably extend across the entire width of the packaging bag.

[0055] In the Figure 1 The folded-over end of the front part 2 and the folded-over end of the back part 1 are arranged at the same height.

[0056] However, it is also possible that the end of the folded-over front section 2 extends upwards beyond the end of the folded-over back section 1. In particular, such an extending end of the front section 2 above the folded-over end of the back section 1 can be attached to the back section 1 by adhesive. This is not shown here.

[0057] The construction is such that a thermal part 5 is arranged in at least partial, preferably predominant, overlap with the front part 2, which is folded around the lower end areas of the front part 2 and back part 1 up to the back part 1 and also covers the back part 1 at least partially, preferably predominantly.

[0058] In the lower fold area, the thermal part 5 is folded in a fold 6, which surrounds the previously mentioned fold from the lower area of ​​the front part 2 onto the back part 1 and also a fold of the lower end area of ​​the back part 1 onto itself and stabilizes these folds.

[0059] Preferably, the thermal insert 5 is adhesively bonded to the backing insert 1 at its lateral edges in adhesive areas 7, particularly only partially, whereby an upwardly open pocket 8 is formed between the backing insert 1 and the thermal insert 5, into which, for example, a napkin can be inserted when food is sold in the packaging bag. However, the lateral adhesive areas 7 can also extend over the entire height where the thermal insert 5 covers the backing insert 1.

[0060] The thermal part 5 can also be connected in adhesive areas, preferably only laterally arranged at the edge, with the end of the front part 2 folded over onto the back part 1, but this is not shown here.

[0061] The portion of the thermal part 5 that covers the front part 2 is preferably bonded at its upper edge, near the opening 4, by means of an adhesive area 11 across the full width of the packaging bag. Along the side edge, the thermal part 5 is bonded to the front part 2 only partially in at least one adhesive area 12, where two adhesive areas 12 are shown here, but it can also be bonded along the entire side height.

[0062] According to the invention, improved thermal insulation is achieved by arranging the thermocouple 5 on the front and back of the packaging bag and around its bottom, and by enclosing or even enclosing an air layer between itself and the covered parts 1, 2.

[0063] In the state shown here, the opening 4 is covered by a flap 13, which is formed adjacent to the end of the overhanging section 1a of the back part 1, which is folded over the opening 4 in a fold 14. The overhanging section 1a thus extends upwards from the opening 4 in the back part 1 and, after the fold 14, back downwards, preferably forming the flap 13 together with the downwardly extended section.

[0064] In the covered state of the opening 4, the partial area of ​​the thermal part 5 is preferably also at least partially covered by the tab 13, which is arranged in overlap with the front part 2.

[0065] The fold 14 of the overhang area 1a is located at a distance from the opening 4, so that a clearance area 15 of the back part 1 is formed above the opening 4, at which the packaging bag can be manually grasped when open, particularly when the flap 13 at the fold is folded towards the back part 1 and the portion of the thermal part 5 covering it. Figure 2 illustrates an advantageous multi-step manufacturing process by which the previously described packaging bag can be produced from a single sheet, e.g., of paper.

[0066] For this purpose, a single sheet, e.g. made of paper, is provided, which in step I is divided into three components by cuts 20, forming back part 1, front part 2 and thermal part 5.

[0067] In step II, the front part 2 is placed onto the thermal part 5, with adhesive areas inserted in between, which are applied, for example, to the thermal part 5. Preferably, these are the ones intended for Figure 1 The aforementioned adhesive areas 11 and 12. Adhesive areas are applied to the side areas of the attached front part 2, in particular those for Figure 1 the aforementioned lateral adhesive areas 3, and in step III the back part 1 is glued onto the front part 2, with the back part 1 extending over the front part 2 (here shown upwards) with an overhang area 1a, which later forms the tab 13.

[0068] In step IV, the portion of the thermal part 5 that is not covered by the front part 2 and which points downwards in this illustration is folded 6 around the lower end area of ​​the back part 1 and the front part 2, so that this portion lies on the back part 1 and is glued there, in particular only laterally and partially, preferably at least in the aforementioned gluing areas 7, so that the upwardly open pocket 8 is created.

[0069] Preferably, in step IV, the folding 6 of the thermal part 5 also simultaneously creates a folding of the lower end area of ​​the front part 2 onto the back part 1 and of the lower area of ​​the back part 1 onto itself, in particular wherein an adhesive area 16 is applied in the folding of the back part onto itself.

[0070] At the end of the overhanging area 1a, which forms the tab 13, an adhesive area can preferably be provided in order to be able to glue the tab 13 firmly onto the thermal part 5 when covering the opening 4.

[0071] Further training may provide that, for a delivery state of the packaging bag in step V, the flap 13 is first folded over onto the back part 1 or the thermal part 5 covering it, so that the packaging bag has an uncovered opening 4.

[0072] For use, the opening 4 can be covered by folding the tab 13 towards the front part 2, as shown in step VI, which is not part of the manufacturing process but takes place during use.

Claims

1. Packaging bags with a back part (1) and a front part (2), preferably each made entirely or at least predominantly of paper, which are bonded together at the sides and form a base with their lower end regions, preferably also bonded at their lower end regions, wherein an opening (4) which can be closed with a flap (13) is formed in the area of ​​the upper end of the front part (2) between the front part (2) and the back part (1), wherein the back part (1) comprises an overhanging area (1a) which has no connection to the front part (2) at the sides and which comprises the flap (13) which can be folded towards the front part (2), preferably which can be secured by means of an adhesive strip. characterized by the fact that a thermal part (5) is provided which is folded around the lower end areas (9) and covers the front part (2) and back part (1) at least partially.

2. Packaging bag according to claim 1, characterized by the fact that the tab (13) in a state in which the tab (13) covers the opening (4), in particular is folded towards the front part (2), at least partially covers the area of ​​the thermal part (5) covering the front part (2).

3. Packaging bag according to any of the preceding claims, characterized by the fact that the part of the thermal part (5) covering the front part (2) is glued to the front part (2) in an adhesive area (11) at its upper edge over the entire width of the packaging bag and / or that the part of the thermal part (5) covering the back part (1) is glued to the back part (1) in an adhesive area (11) at its upper edge over the entire width of the packaging bag.

4. Packaging bag according to any of the preceding claims, characterized by the fact thata pocket, in particular an upwardly open pocket, is formed between the part of the thermal part (5) covering the front part (2) and the front part (2) and / or between the part of the thermal part (5) covering the back part (1) and the back part (1).

5. Packaging bag according to any of the preceding claims, characterized by the fact that the portion of the thermal part (5) covering the back part (1) and / or the portion of the thermal part (5) covering the front part (2) has no adhesion to the back part (1) at least partially at its upper edge, in particular over the entire width of the packaging bag or at least over the predominant width of the packaging bag, in particular wherein the upwardly open pocket (8) according to claim 4 is formed between the back part (1) and the portion of the thermal part (5) covering it, in particular which can be filled with a napkin.

6. Packaging bag according to any of the preceding claims, characterized by the fact that the part of the thermal part (5) covering the front part (2) is fully or only partially bonded to the front part (2) at its lateral edge, and / or the part of the thermal part (5) covering the back part (1) is fully or only partially bonded to the back part (1) at its lateral edge, in particular that unbonded areas are arranged around at least one bonded area at the lateral edge.

7. Packaging bag according to any of the preceding claims, characterized by the fact that the front part (2) is folded around the lower end of the back part (1) at its lower end, and in particular is glued to the back part (1) at its end.

8. Packaging bag according to claim 7, characterized by the fact thatin the folding of the front part (2) a fold, preferably a glued fold, of the lower end region of the back part (1) is enclosed on itself, in particular wherein the front part (2) is adhesively connected in the region of its end to the area of ​​the back part (1) folded on itself, in particular also being adhesively connected to the back part (1) over the area of ​​the back part (1) folded on itself.

9. Method for producing a packaging bag with a thermal part (5) which surrounds a front part (2) and a back part (1) with an overhanging area (1a) forming a flap (13), at least partially, which in the area of ​​their overlap define a receiving area for goods, in particular according to one of the preceding claims, comprising the following steps: a. providing a single sheet, preferably made of paper, b.Dividing the sheet between two opposite ends into a first end-end partial sheet, a second end-end partial sheet and an intermediate sheet lying between the two end-end sheets, wherein the divided components of the sheet form the thermal part (5), the front part (2) and the back part (1), in particular wherein the first end-end sheet forms the thermal part (5), the second end-end sheet forms the back part (1) with overhang area (1a) and the intermediate sheet forms the front part (2), c.The front part (2) is placed on the thermal part (5) with intervening adhesive areas (11, 12) forming a partial area of ​​the thermal part (5) not covered by the front part (2), and the back part (1) with overhang area (1a) is placed on the front part (2) with intervening adhesive areas (3) forming a partial area of ​​the back part (1) not covered by the front part (2), which forms the overhang area (1a), thereby positioning the front part (2) between the thermal part (5) and the back part (1), i.e., adhesive attachment of the partial area of ​​the thermal part (5) not covered by the front part (2) to the back part (1) forming a fold (6) at least in the thermal part (5).

10. Method according to claim 9, characterized by the fact thatWhen the fold (6) is formed in the thermal part (5), a fold is also formed in the front part (2), in particular in a part of the front part (1) not covered by the back part (1), preferably wherein the part of the front part (2) not covered by the back part (1) is bonded to the back part (1), in particular over its entire width.

11. Method according to claim 10, characterized by the fact that When the fold (6) in the thermal part (5) and the fold in the front part (2) are formed, a fold is also formed in the back part (1), with which the back part (1), in particular its lower end area, is folded onto itself.

12. Method according to claim 10 or 11, characterized by the fact that all folds are formed around the same folding axis, and in particular simultaneously.

13. Method according to any of the preceding claims, characterized by the fact thatTo transfer the packaging bag into a delivery state, the protruding area (1a) forming the flap (13) is folded onto the part of the thermal part (5) covering the back part (1).

Images