CA3169570A1 - Thermal container - Google Patents
Thermal containerInfo
- Publication number
- CA3169570A1 CA3169570A1 CA3169570A CA3169570A CA3169570A1 CA 3169570 A1 CA3169570 A1 CA 3169570A1 CA 3169570 A CA3169570 A CA 3169570A CA 3169570 A CA3169570 A CA 3169570A CA 3169570 A1 CA3169570 A1 CA 3169570A1
- Authority
- CA
- Canada
- Prior art keywords
- paper
- shreds
- thermal container
- bag
- fibrous material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/38—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation
- B65D81/3888—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation wrappers or flexible containers, e.g. pouches, bags
- B65D81/3897—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents with thermal insulation wrappers or flexible containers, e.g. pouches, bags formed of different materials, e.g. laminated or foam filling between walls
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
Abstract
The present invention relates to a thermal container which comprises at least one flat back cushion and a flat front cushion extending in a different plane over the back cushion, said cushions being connected to one another at opposite side edges as well as at a further side edge of the thermal container or being integrally formed or transitioning into one another via a connecting piece so that a cavity is formed between the back cushion and the front cushion, the back cushion and the front cushion each being formed from at least one bag or at least one compartment and a fibrous material located in the at least one bag or the at least one compartment, wherein the fibrous material comprises a stack of a plurality of individual layers made from creped fibrous material lying flat one above the other, and wherein the fibrous material further comprises at least one layer of randomly oriented loose paper shreds and/or hemp shreds, which layer is not separately enclosed and is arranged in each case between two of the individual layers formed from unordered fibers and each having a crepe height 0.3 mm and < 1 mm.
Description
THERMAL CONTAINER
The present invention relates to a thermal container which comprises at least one flat back cushion and a flat front cushion extending in a different plane above the back cushion, said cushions being connected to one another at opposite side edges as well as at a further side edge of the thermal container or being integrally formed or transitioning into one another via a connecting piece so that a cavity is formed between the back cushion and the front cushion, the back cushion and the front cushion each being formed from at least one bag or at least one compartment and from a fibrous material located in the at least one bag or the at least one compartment, wherein the fibrous material comprises a stack of a plurality of individual layers made from creped fibrous material lying flat one above the other.
Publication EP 3 772 472 Al describes a thermal container of this type. Air collects between the creped individual layers lying flat one above the other, which leads to a temperature retention capability of the known thermal container of up to 72 hours.
The known thermal container has the advantage that due to the fibrous material that is predominantly used for this purpose it is ecologically harmless to recycle.
However, an even longer temperature retention capability of the thermal container would be desirable for different application purposes or at ambient temperatures deviating greatly from the temperature of the packaging material.
Publication DE 20 2019 003 407 U1 describes a packaging made from corrugated cardboard for holding and/or transporting temperature-sensitive products. The corrugated cardboard is folded to form a cuboid carton, wherein the side walls of the carton are each formed by two spaced-apart claddings Date Recue/Date Received 2022-08-04 between which a thermal insulation material is accommodated. The thermal insulation material can be, for example, a tubular bag containing paper shreds.
Such a thermal container serves to maintain the temperature of a packaged product placed in the carton over a certain period of time. Thanks to the thermal container, cooling of the packaged goods placed therein, such as food, drugs, or blood bottles that are to be kept cool, can thus be maintained over a certain period of time within a certain temperature window.
However, the known thermal container is relatively difficult to produce. For example, the size and shape of the tubular bag must be exactly adapted to the cuboid interior space formed between the claddings of the side walls, and the tubular bag must subsequently be fastened to the inside with an adhesive. This is already difficult because the paper shreds in the tubular bag keep shifting.
Since the paper shreds shift downwards even during use of the thermal container, the claddings of the side walls must be relatively close together.
Accordingly, only a limited quantity of paper shreds can be accommodated between the claddings, so that the thermal insulation effect of the cardboard side walls filled with the paper shreds is only slightly greater than that of conventional cardboard side walls.
Since the paper shreds cannot be prevented from shifting in this thermal container, the container does not have stable thermal insulation properties on all sides, thus making it unsuitable in particular for the transportation and storage of thermally sensitive products.
It is therefore the object of the present invention to provide a thermal container that has a relatively long-term temperature retention function even for thermally sensitive products.
The present invention relates to a thermal container which comprises at least one flat back cushion and a flat front cushion extending in a different plane above the back cushion, said cushions being connected to one another at opposite side edges as well as at a further side edge of the thermal container or being integrally formed or transitioning into one another via a connecting piece so that a cavity is formed between the back cushion and the front cushion, the back cushion and the front cushion each being formed from at least one bag or at least one compartment and from a fibrous material located in the at least one bag or the at least one compartment, wherein the fibrous material comprises a stack of a plurality of individual layers made from creped fibrous material lying flat one above the other.
Publication EP 3 772 472 Al describes a thermal container of this type. Air collects between the creped individual layers lying flat one above the other, which leads to a temperature retention capability of the known thermal container of up to 72 hours.
The known thermal container has the advantage that due to the fibrous material that is predominantly used for this purpose it is ecologically harmless to recycle.
However, an even longer temperature retention capability of the thermal container would be desirable for different application purposes or at ambient temperatures deviating greatly from the temperature of the packaging material.
Publication DE 20 2019 003 407 U1 describes a packaging made from corrugated cardboard for holding and/or transporting temperature-sensitive products. The corrugated cardboard is folded to form a cuboid carton, wherein the side walls of the carton are each formed by two spaced-apart claddings Date Recue/Date Received 2022-08-04 between which a thermal insulation material is accommodated. The thermal insulation material can be, for example, a tubular bag containing paper shreds.
Such a thermal container serves to maintain the temperature of a packaged product placed in the carton over a certain period of time. Thanks to the thermal container, cooling of the packaged goods placed therein, such as food, drugs, or blood bottles that are to be kept cool, can thus be maintained over a certain period of time within a certain temperature window.
However, the known thermal container is relatively difficult to produce. For example, the size and shape of the tubular bag must be exactly adapted to the cuboid interior space formed between the claddings of the side walls, and the tubular bag must subsequently be fastened to the inside with an adhesive. This is already difficult because the paper shreds in the tubular bag keep shifting.
Since the paper shreds shift downwards even during use of the thermal container, the claddings of the side walls must be relatively close together.
Accordingly, only a limited quantity of paper shreds can be accommodated between the claddings, so that the thermal insulation effect of the cardboard side walls filled with the paper shreds is only slightly greater than that of conventional cardboard side walls.
Since the paper shreds cannot be prevented from shifting in this thermal container, the container does not have stable thermal insulation properties on all sides, thus making it unsuitable in particular for the transportation and storage of thermally sensitive products.
It is therefore the object of the present invention to provide a thermal container that has a relatively long-term temperature retention function even for thermally sensitive products.
2 Date Recue/Date Received 2022-08-04 This object is achieved by a thermal container which comprises at least one flat back cushion and a flat front cushion extending in a different plane over the back cushion, said cushions being connected to one another at opposite side edges as well as at a further side edge of the thermal container or being integrally formed or transitioning into one another via a connecting piece so that a cavity is formed between the back cushion and the front cushion, the back cushion and the front cushion each being formed from at least one bag or at least one compartment and from a fibrous material located in the at least one bag or the at least one compartment, wherein the fibrous material comprises a stack of a plurality of individual layers made from creped fibrous material lying flat one above the other, wherein the fibrous material further comprises at least one layer of randomly oriented loose paper shreds and/or hemp shreds, which layer is not separately enclosed and is arranged in each case between two of the individual layers formed from unordered fibers and each having a crepe height 0.3 mm and < 1 mm.
Both cold and warm objects can be stored and transported in the thermal container according to the invention. The thermal container according to the invention is particularly suitable as a cooler bag. The at least one object, the temperature of which is to be maintained, can advantageously be inserted into the cavity formed between the back cushion and the front cushion connected thereto. The cavity can then be closed appropriately.
The creped individual fibrous layers of the back cushion and the front cushion in themselves bring about a particularly advantageous thermal insulation of the at least one object placed in the thermal container from the surroundings.
This is achieved in particular by the air inclusions or air gaps formed between the individual layers made from creped fibrous material lying flat one above the other. Due to creping of the individual layers, each of the individual layers has a plurality of peaks and troughs with air accumulating in the troughs. Since the creping is never identical from one individual layer to the next, and the individual layers are not stacked on top of one another or pressed into one
Both cold and warm objects can be stored and transported in the thermal container according to the invention. The thermal container according to the invention is particularly suitable as a cooler bag. The at least one object, the temperature of which is to be maintained, can advantageously be inserted into the cavity formed between the back cushion and the front cushion connected thereto. The cavity can then be closed appropriately.
The creped individual fibrous layers of the back cushion and the front cushion in themselves bring about a particularly advantageous thermal insulation of the at least one object placed in the thermal container from the surroundings.
This is achieved in particular by the air inclusions or air gaps formed between the individual layers made from creped fibrous material lying flat one above the other. Due to creping of the individual layers, each of the individual layers has a plurality of peaks and troughs with air accumulating in the troughs. Since the creping is never identical from one individual layer to the next, and the individual layers are not stacked on top of one another or pressed into one
3 Date Recue/Date Received 2022-08-04 another in a form-fitting manner, the troughs of the respective overlying individual layerl do not or do not completely fit into the troughs of the respective underlying individual layer, so that an air gap is maintained in all cases.
Moreover, in the present invention a layer of paper shreds and/or hemp shreds, i.e., a layer of randomly oriented paper shreds and/or hemp shreds, is arranged at least between two of the creped individual layers. Although the paper shreds are individual paper elements not connected to one another to form a closed layer, and the hemp shreds are individual hemp elements not connected to one another to form a closed layer, which shift, for example, in the side walls of the thermal container described in publication DE 20 2019 003 407 U1 and which are not held together separately by a bag or the like in the present invention, the paper shreds and/or the hemp shreds surprisingly remain largely in their respective positions between the individual layers in the present invention. This is due to the special creping of the individual layers lying on both sides of the shredded paper layer and/or shredded hemp layer.
The peaks and troughs, which are formed as a result of the creping of these individual layers and are spaced apart from one another in terms of their height by no more than 1 mm, particularly preferably by less than 0.4 mm, act like teeth that hold the paper shreds and/or the hemp shreds so that they cannot shift between the individual layers.
In the present invention, at least these two creped individual layers arranged on both sides of the shredded paper layer and/or shredded hemp layer, but preferably all of the creped individual layers, have a crepe height of 0.3 mm, so that a large amount of air can collect between the individual layers or at least between the shredded paper layer and/or shredded hemp layer and the individual layers lying on both sides of the shredded paper layer and/or shredded hemp layer, which air serves for thermal insulation.
Moreover, a large number of air gaps are formed between the paper shreds and/or hemp shreds, which in addition to the air inclusions already present
Moreover, in the present invention a layer of paper shreds and/or hemp shreds, i.e., a layer of randomly oriented paper shreds and/or hemp shreds, is arranged at least between two of the creped individual layers. Although the paper shreds are individual paper elements not connected to one another to form a closed layer, and the hemp shreds are individual hemp elements not connected to one another to form a closed layer, which shift, for example, in the side walls of the thermal container described in publication DE 20 2019 003 407 U1 and which are not held together separately by a bag or the like in the present invention, the paper shreds and/or the hemp shreds surprisingly remain largely in their respective positions between the individual layers in the present invention. This is due to the special creping of the individual layers lying on both sides of the shredded paper layer and/or shredded hemp layer.
The peaks and troughs, which are formed as a result of the creping of these individual layers and are spaced apart from one another in terms of their height by no more than 1 mm, particularly preferably by less than 0.4 mm, act like teeth that hold the paper shreds and/or the hemp shreds so that they cannot shift between the individual layers.
In the present invention, at least these two creped individual layers arranged on both sides of the shredded paper layer and/or shredded hemp layer, but preferably all of the creped individual layers, have a crepe height of 0.3 mm, so that a large amount of air can collect between the individual layers or at least between the shredded paper layer and/or shredded hemp layer and the individual layers lying on both sides of the shredded paper layer and/or shredded hemp layer, which air serves for thermal insulation.
Moreover, a large number of air gaps are formed between the paper shreds and/or hemp shreds, which in addition to the air inclusions already present
4 Date Recue/Date Received 2022-08-04 between the individual layers result in excellent thermal insulation properties of the thermal container.
The paper shreds and/or hemp shreds are unordered, i.e., they have a wide variety of orientations within the layer. They can thus lie one above the other and/or form tangles and/or project in the direction of the respectively abutting creped individual layer.
In order to form suitably large air inclusions between the individual layers and to hold the paper shreds and/or hemp shreds well, each of the individual layers preferably has a crepe height of 0.3 mm, preferably of 0.4 mm, particularly preferably of 0.6 mm, or of 0.65 mm in one exemplary embodiment. This is therefore so-called high creping.
For example, in the present invention, either 4 or 8 of the creped individual layers are stacked one above the other without intermediate paper shreds and/or hemp shreds, i.e., 4-layer or 8-layer stacks are formed, wherein one layer of the shredded paper and/or shredded hemp is arranged between each two of the 4-layer or 8-layer stacks. For example, the thermal container 16 has creped individual layers with one or three shredded paper layers and/or shredded hemp layers.
The bag or compartment also has a protective function for the fibrous material located therein.
The fibrous material used in the present invention both for the creped individual layers and for the paper shreds, which can be a primary fibrous material such as a pulp, a mechanical wood pulp or a semichemical paper pulp, and/or a secondary fibrous material such as a fibrous material obtained from recycled paper, and the hemp used for the hemp shreds have the advantage that they are both natural materials that are harmless to the environment and easy to
The paper shreds and/or hemp shreds are unordered, i.e., they have a wide variety of orientations within the layer. They can thus lie one above the other and/or form tangles and/or project in the direction of the respectively abutting creped individual layer.
In order to form suitably large air inclusions between the individual layers and to hold the paper shreds and/or hemp shreds well, each of the individual layers preferably has a crepe height of 0.3 mm, preferably of 0.4 mm, particularly preferably of 0.6 mm, or of 0.65 mm in one exemplary embodiment. This is therefore so-called high creping.
For example, in the present invention, either 4 or 8 of the creped individual layers are stacked one above the other without intermediate paper shreds and/or hemp shreds, i.e., 4-layer or 8-layer stacks are formed, wherein one layer of the shredded paper and/or shredded hemp is arranged between each two of the 4-layer or 8-layer stacks. For example, the thermal container 16 has creped individual layers with one or three shredded paper layers and/or shredded hemp layers.
The bag or compartment also has a protective function for the fibrous material located therein.
The fibrous material used in the present invention both for the creped individual layers and for the paper shreds, which can be a primary fibrous material such as a pulp, a mechanical wood pulp or a semichemical paper pulp, and/or a secondary fibrous material such as a fibrous material obtained from recycled paper, and the hemp used for the hemp shreds have the advantage that they are both natural materials that are harmless to the environment and easy to
5 Date Recue/Date Received 2022-08-04 recycle and as such exhibit low heat conduction and thus good thermal insulation properties.
Unlike paper or the corrugated cardboard used in publication DE 20 2019 003 407 U1, at least the two individual layers, which are located on both sides of the respective layer of paper shreds and/or hemp shreds, are formed from unordered fibers. These individual layers, which are in addition also creped, thus have a higher surface roughness than paper or corrugated cardboard and thus hold the paper shreds and/or hemp shreds particularly well.
In addition, the form of the fibrous material used leads to an advantageous softness and bulkiness, which ensures that the packaged good can be safely stored and transported in the thermal container.
The thermal container, according to the invention, is easy to stack but can also be used as a shopping bag.
In a preferred embodiment of the present invention, a coefficient of static friction between one of the individual layers and a layer of the paper from which the paper shreds are formed, is greater by at least a factor of 1.1, preferably by at least a factor of 1.25, particularly preferably by at least a factor of 1.34, than the coefficient of static friction between two layers of the paper from which the paper shreds are formed.
As a result, the paper shreds adhere particularly well to the creped individual layers and thus hardly shift. In particular, the paper shreds adhere better to the creped individual layers than they would adhere, for example, to cardboard packaging as used, for example, in publication DE 20 2019 003 407 U1 to form the side walls of the packaging. Even more so, in this embodiment of the invention the paper shreds adhere better to the creped individual layers than they would adhere to the tubular bag consisting of a polyethylene film in which they are accommodated in publication DE 20 2019 003 407 U1. Thus, the
Unlike paper or the corrugated cardboard used in publication DE 20 2019 003 407 U1, at least the two individual layers, which are located on both sides of the respective layer of paper shreds and/or hemp shreds, are formed from unordered fibers. These individual layers, which are in addition also creped, thus have a higher surface roughness than paper or corrugated cardboard and thus hold the paper shreds and/or hemp shreds particularly well.
In addition, the form of the fibrous material used leads to an advantageous softness and bulkiness, which ensures that the packaged good can be safely stored and transported in the thermal container.
The thermal container, according to the invention, is easy to stack but can also be used as a shopping bag.
In a preferred embodiment of the present invention, a coefficient of static friction between one of the individual layers and a layer of the paper from which the paper shreds are formed, is greater by at least a factor of 1.1, preferably by at least a factor of 1.25, particularly preferably by at least a factor of 1.34, than the coefficient of static friction between two layers of the paper from which the paper shreds are formed.
As a result, the paper shreds adhere particularly well to the creped individual layers and thus hardly shift. In particular, the paper shreds adhere better to the creped individual layers than they would adhere, for example, to cardboard packaging as used, for example, in publication DE 20 2019 003 407 U1 to form the side walls of the packaging. Even more so, in this embodiment of the invention the paper shreds adhere better to the creped individual layers than they would adhere to the tubular bag consisting of a polyethylene film in which they are accommodated in publication DE 20 2019 003 407 U1. Thus, the
6 Date Recue/Date Received 2022-08-04 coefficient of static friction between a layer of the paper from which the paper shreds are formed and one of the creped individual layers used in the present invention is greater by at least a factor of 1.9 than the coefficient of static friction between a layer of the paper from which the paper shreds are formed and the polyethylene film used in publication DE 20 2019 003 407 U1.
Assuming that the coefficient of static friction between two layers of the paper from which the paper shreds used in the present invention are formed is on average 0.4, in the present invention the coefficient of static friction between a layer of the paper from which the paper shreds are formed and one of the individual creped layers will be at least 0.5, preferably 0.55 and particularly preferably above 0.6, under the same measurement conditions.
The individual layers of the creped fibrous material preferably have a creping factor of at least 40%, in a special embodiment 44%. The latter creping factor corresponds to an elongation of 80%.
If the at least one bag in the present invention is formed from a fleece made of thermoplastic material, it offers good moisture protection for the fibrous material therein, which has good absorbency. This is particularly the case if the fleece is a polypropylene spunbond.
It is particularly advantageous if the at least one bag encompasses the fibrous material like a tube. In this case, lateral edges of the at least one bag can also be sewn up.
In another, likewise advantageous embodiment of the present invention, the at least one bag or the at least one compartment of the back cushion as well as the at least one bag or the at least one compartment of the front cushion are made from paper. As a result, the entire thermal container consists of ecologically recyclable material, namely paper and fibrous material.
Assuming that the coefficient of static friction between two layers of the paper from which the paper shreds used in the present invention are formed is on average 0.4, in the present invention the coefficient of static friction between a layer of the paper from which the paper shreds are formed and one of the individual creped layers will be at least 0.5, preferably 0.55 and particularly preferably above 0.6, under the same measurement conditions.
The individual layers of the creped fibrous material preferably have a creping factor of at least 40%, in a special embodiment 44%. The latter creping factor corresponds to an elongation of 80%.
If the at least one bag in the present invention is formed from a fleece made of thermoplastic material, it offers good moisture protection for the fibrous material therein, which has good absorbency. This is particularly the case if the fleece is a polypropylene spunbond.
It is particularly advantageous if the at least one bag encompasses the fibrous material like a tube. In this case, lateral edges of the at least one bag can also be sewn up.
In another, likewise advantageous embodiment of the present invention, the at least one bag or the at least one compartment of the back cushion as well as the at least one bag or the at least one compartment of the front cushion are made from paper. As a result, the entire thermal container consists of ecologically recyclable material, namely paper and fibrous material.
7 Date Recue/Date Received 2022-08-04 In an advantageous embodiment of the invention, this can be achieved in that the at least one bag or the at least one compartment of the back cushion as well as the at least one bag or the at least one compartment of the front cushion are formed by an inner paper bag inserted into an outer paper bag, wherein the fibrous material is located each time between an outer side of the inner paper bag and an inner side of the outer paper bag. The inner paper bag is thus inserted into the outer paper bag, and the fibrous material is inserted between the material of the inner paper bag and the material of the outer paper bag at least on the front side and the back side of this embodiment of the thermal container according to the invention. The respectively packaged item, which is typically to be kept cool, can then be placed into the inner paper bag.
In an expedient configuration of this embodiment of the invention, the inner paper bag and the outer paper bag while containing fibrous material are connected to one another. As a result, the fibrous material inside cannot slide out of the space between the outer paper bag and the inner paper bag. This also means that there is no risk of the packaged item sliding into the space between the outer paper bag and the inner paper bag.
The thermal container according to the invention is particularly ecologically valuable if the creped fibrous material is made from cellulose wadding, which is made from at least 90% recycled waste paper with waste paper qualities in accordance with DIN EN 643.
It has been found to be particularly advantageous if the paper shreds are made from shredded or chopped paper or if the hemp shreds are made from shredded or chopped hemp. For example, paper shredded for reasons of data privacy can be used in an ecologically worthwhile manner. Moreover, the dimensions of paper shredded by conventional shredding devices are ideal for achieving good temperature retention capability in the thermal container according to the invention.
In an expedient configuration of this embodiment of the invention, the inner paper bag and the outer paper bag while containing fibrous material are connected to one another. As a result, the fibrous material inside cannot slide out of the space between the outer paper bag and the inner paper bag. This also means that there is no risk of the packaged item sliding into the space between the outer paper bag and the inner paper bag.
The thermal container according to the invention is particularly ecologically valuable if the creped fibrous material is made from cellulose wadding, which is made from at least 90% recycled waste paper with waste paper qualities in accordance with DIN EN 643.
It has been found to be particularly advantageous if the paper shreds are made from shredded or chopped paper or if the hemp shreds are made from shredded or chopped hemp. For example, paper shredded for reasons of data privacy can be used in an ecologically worthwhile manner. Moreover, the dimensions of paper shredded by conventional shredding devices are ideal for achieving good temperature retention capability in the thermal container according to the invention.
8 Date Recue/Date Received 2022-08-04 Preferably, the paper shreds and/or hemp shreds have a width in a range of 0.5 cm to 1 cm. The length of the paper shreds and/or hemp shreds can be the same or different. For example, the paper shreds and/or hemp shreds can be up to 4 cm long or longer. The longer the paper shreds and/or hemp shreds, the better the thermal properties of the thermal container according to the invention.
Preferred embodiments of the present invention are explained in more detail below with reference to figures, wherein Figure 1 schematically shows in a top view a possible embodiment of a thermal container according to the invention;
Figure 2 schematically shows in a top view an embodiment of the thermal container according to the invention with a packaged item inserted;
Figure 3 schematically shows in a sectional side view a possible embodiment of a back or front cushion of an embodiment of the thermal container according to the invention; and Figure 4 schematically shows in a perspective side view another embodiment of the thermal container according to the invention.
The represented embodiments are not shown to scale in any of the figures.
Rather, for the sake of clarity, certain features are shown particularly large in the figures in comparison to other features of the invention. Most of the hidden features are shown with dashed lines.
Figure 1 schematically shows in a top view a possible embodiment of a thermal container 1 according to the invention. In the exemplary embodiment shown, the thermal container 1 is a cooler bag for transportation purposes. Such a cooler bag can have, for example, an outer width from 300 to 600 mm and an
Preferred embodiments of the present invention are explained in more detail below with reference to figures, wherein Figure 1 schematically shows in a top view a possible embodiment of a thermal container according to the invention;
Figure 2 schematically shows in a top view an embodiment of the thermal container according to the invention with a packaged item inserted;
Figure 3 schematically shows in a sectional side view a possible embodiment of a back or front cushion of an embodiment of the thermal container according to the invention; and Figure 4 schematically shows in a perspective side view another embodiment of the thermal container according to the invention.
The represented embodiments are not shown to scale in any of the figures.
Rather, for the sake of clarity, certain features are shown particularly large in the figures in comparison to other features of the invention. Most of the hidden features are shown with dashed lines.
Figure 1 schematically shows in a top view a possible embodiment of a thermal container 1 according to the invention. In the exemplary embodiment shown, the thermal container 1 is a cooler bag for transportation purposes. Such a cooler bag can have, for example, an outer width from 300 to 600 mm and an
9 Date Recue/Date Received 2022-08-04 outer length from 300 to 600 mm. The closure flap of the cooler bag can have a length from 50 to 120 mm. Other dimensions are also possible, of course.
The thermal container 1 can, however, also be used to keep objects warm In Figure 2, the thermal container 1 from Figure 1 is shown in a top view. It is open and a packaged item 15 has been inserted therein.
The thermal container 1 has a flat back cushion 2 and a flat front cushion 3.
The back cushion 2 is connected to the front cushion 3 on the opposite side edges 4, 5 of the thermal container 1. In the exemplary embodiment shown, this connection is realized by seams 16, 17 running along the side edges 4, 5.
In other embodiments of the invention, which are not shown, this connection can be made alone or in combination with the seams 16, 17 by gluing and/or crimping the material.
In the exemplary embodiment shown in Figs. 1 and 2, the back cushion 2 and the front cushion 3 are formed from the same material web in the form of a bag web. For this reason, the back cushion 2 is formed integrally with the front cushion 3 on a further side edge 6 of the thermal container 1. The material of the back cushion 2 thus merges directly into the material of the front cushion 3 at the side edge 6 which can form, for example, a lower edge of a pocket.
In other embodiments of the present invention that are not shown, the back cushion 2 and the front cushion 3 can also be formed separately and connected to one another at the side edge 6. Furthermore, it is possible that, in other embodiments of the present invention, at least one piece of material is provided between the back cushion 2 and the front cushion 3 and connected to the side edges 4, 5 and/or 6. The piece of material can, for example, be strip-like or web-like.
Date Recue/Date Received 2022-08-04 A cavity 7 is formed between the back cushion 2 and the front cushion 3, into which the packaged good 15 is inserted, as can be seen in Figure 2.
In the embodiment shown in Figs. 1 and 2, the back cushion 2 has a back cushion section 21 protruding from the front cushion 3 on one side. In other embodiments of the present invention, a closure flap can also be connected to one side to the back cushion 2. The protruding back cushion section 21 or the closure flap, as indicated schematically by the arrow A in Fig. 2, is folded onto a surface of the front cushion 3 to close the cavity 7 and is connected directly or indirectly to it. The protruding back cushion section 21 or the closure flap can, for example, be glued to the front cushion 3 by means of adhesive lines.
Adhesive tufts may be used for this as well.
The back cushion 2 and the front cushion 3 each comprise a bag 8. The bag 8 encloses a fibrous material 9 in a tube-like manner. As can be seen in Figure 4, at least one compartment 18 may be provided instead of the bag 8 in which the fibrous material 9 is located. Compared to the bag 8, the compartment 18 is not completely formed around the fibrous material 9 but can be closed in advantageous variants of the invention.
In the thermal container 1 shown in Figures 1 and 2, the fibrous material 9 is used, which is shown schematically in Figure 3 in a sectional side view that is not to scale.
The fibrous material 9 consists of a stack of a plurality of individual layers made from creped fibrous material lying flat one above the other. What is special about the creped fibrous material used here is that it is so-called high crepe. The creped fibrous material used therefore has a particularly high crepe height d of 0.3 mm, for example of 0.35 mm, per individual layer 91. In some embodiments of the present invention, the crepe height d is even greater, for example 0.5 mm or even 0.65 mm. In the material used, which is cellulose wadding in the exemplary embodiment shown, the crepe height d of Date Recue/Date Received 2022-08-04 0.65 mm leads to an elongation of 80% which in turn corresponds to a crepe factor of 44%.
High crepe is a very thin material which can also have holes, In the exemplary embodiment shown, the grammage of the creped fibrous material used is 23 grams per square meter, but can also be different in other embodiments of the invention.
In the embodiment shown, the coefficient of static friction between one of the individual layers 91 and a layer of the paper, from which the paper shreds 92 are formed, is greater by at least a factor of 1.34 than the coefficient of static friction between two layers of the paper from which the paper shreds 92 are formed. This was tested as follows:
A flat mat was used for each of the test measurements; this was checked by means of a water level. In test measurements (a) the mat was covered in each case with one layer of the paper, from which the paper shreds 92 are formed;
in test measurements (b) it was covered in each case with a polypropylene film; in test measurements (c) it was covered in each case with a layer of cardboard; and in test measurements (d) it was covered in each case with one of the creped individual layers 91, here with high crepe. Furthermore, a planar surface of a measuring body was covered with a layer of the paper from which the paper shreds 92 are formed. The dimensions of the measuring body consisting of beech wood are 10 cm x 10 cm x 1.8 cm.
The covered measuring body was placed on the covered mat. The mat was then raised on one side until the measuring body moved. The height by which the mat was raised until the measuring body moved was measured and recorded. The following measured values resulted:
Date Recue/Date Received 2022-08-04 Friction pairing Measured Measured Measured values test 1 values test 2 values test 3 (a) Paper/paper 27.2 28.0 27.2 (b) Paper/polypropylene 17,1 19.3 18.0 film (c) Paper / cardboard 27.7 32.0 27.0 joifqper / high crepe 37.8 38.1 36.5 Table 1: Measured values from static friction test In the exemplary embodiment shown, the creped fibrous material was produced in the following way:
The base material that was used is recycled cellulose wadding from selected waste paper qualities in accordance with DIN EN 643.
After a wet pulping process and removal of non-paper components, but without additional bleaching, the recycled cellulose wadding was creped out on a Yankee cylinder by means of a ceramic-coated steel scraper.
In order to achieve the high crepe height d and thus a high volume of the stack formed from the individual layers 91, the adhesion of the cellulose fibers to the cylinder surface, the geometry of the scraper as well as the angle of attack of the scraper and the draft angle of the creped cellulose wadding web are specifically adjusted. The elongation or the crepe factor is produced accordingly by the difference in speed between the Yankee cylinder and the reel-up.
After creping, the individual layers 91 are doubled, for example to form a plurality of stacks with 4 individual layers 91 each. This is preferably done on a laying machine. The individual layers 91 typically lie one above another in the same layer generation direction. However, since the creping never lies exactly one above the other, the stacking of the individual layers 91 results in a correspondingly high stack height and at the same time a high stack volume.
Date Recue/Date Received 2022-08-04 In principle, however, it is also conceivable to place the individual layers one above the other with an alternating alignment so that the creping crosses from individual layer 91 to individual layer 91 or so that the respective creping of the individual layers 91 crosses.
Paper shreds 92 are then scattered onto one of the stacks of the individual layers 91 and a further stack of the individual layers 91 is placed on this layer of paper shreds. This process can be repeated several times so that, as a result, a stack of the creped individual layers 91 is formed with at least one layer of the paper shreds 92, each arranged between two of the individual layers 91'.
The creped individual layers 91' on either side of the layer of paper shreds 92, each of which creped individual layers can have the same creping but also a different creping from the other individual layers 91, have a crepe height d <
mm, preferably <0.6 mm, in certain cases of < 0.4 mm.
The stack produced in this way is/can then be cut into the desired width depending on the size of the back cushion 2 and the front cushion 3.
Subsequently, the stack is enclosed within the bag 8.
In the exemplary embodiment shown in Figures 1, 2 and 3, the bag 8 consists of a polypropylene spunbond with which the stack of the individual layers 91 and the paper shreds 92 is enclosed in a tube-like manner. The polypropylene spunbond ensures cohesion of the individual layers 91, 911 and of the paper shreds 92.
The proportion of the bag 8 in relation to the total weight of the thermal container 1 is not more than 4 wt.%. Thus, according to Art. 16(3) of the German Packaging Act (VerpackG), the thermal container 1 can be fully credited against the quota of paper. This results in disposal cost savings.
Date Recue/Date Received 2022-08-04 As shown schematically in Figure 1, the bag 8 can be fastened to the creped fibrous material 9, which is located outside in the stack, by means of lines of hotmelt adhesive placed at a distance from one another. These lines are, for example, approximately 20 mm apart and extend along the material web from which in each case the back cushion 2 and the front cushion 3 are formed.
It is advantageous if this material web has areas filled with the fibrous material 9 and adjoining pure fleece areas. Then, a fleece area, which adjoins a back cushion section of the material band, can be used as a closing flap for closing the thermal container 1. A fleece protrusion over the areas filled with the fibrous material 9 can, for example, be approximately 50 mm.
In order to form the back cushion 2 and the front cushion 3 from the material web, the latter is cut transversely to its web running direction.
Subsequently, a section of the area of the separated material web piece filled with the fibrous material 9, which later forms the front cushion 3, is folded over the rest of this material web piece that forms the back cushion. The side edges 4, 5 are then sewn and/or glued and/or crimped together. The crimping is preferably carried out by means of gears. The gluing can be dispensed with.
Figure 4 schematically shows another embodiment of a thermal container 1' according to the invention in a perspective side view.
The thermal container 1' comprises an outer paper bag 11 and an inner paper bag 12 located in the outer paper bag 11. Fibrous material 9, which is constructed as described above, is inserted between the inner paper bag 12 and the outer paper bag 11 on at least two opposite sides of the thermal container 1'.
Date Recue/Date Received 2022-08-04 The inner paper bag 12 and the outer paper bag 11 are connected to one another while including the fibrous material 9.
Carrying handles 14 are provided on an upper side of the thermal container 1'.
Suitable closure means may also be provided on the thermal container 1'.
As shown, the thermal container 1' may have a block bottom 19 but may also be designed without the block bottom 19.
In the described embodiments, hemp shreds can be used instead of the paper shreds 92 or in addition to the paper shreds 92.
Date Recue/Date Received 2022-08-04
The thermal container 1 can, however, also be used to keep objects warm In Figure 2, the thermal container 1 from Figure 1 is shown in a top view. It is open and a packaged item 15 has been inserted therein.
The thermal container 1 has a flat back cushion 2 and a flat front cushion 3.
The back cushion 2 is connected to the front cushion 3 on the opposite side edges 4, 5 of the thermal container 1. In the exemplary embodiment shown, this connection is realized by seams 16, 17 running along the side edges 4, 5.
In other embodiments of the invention, which are not shown, this connection can be made alone or in combination with the seams 16, 17 by gluing and/or crimping the material.
In the exemplary embodiment shown in Figs. 1 and 2, the back cushion 2 and the front cushion 3 are formed from the same material web in the form of a bag web. For this reason, the back cushion 2 is formed integrally with the front cushion 3 on a further side edge 6 of the thermal container 1. The material of the back cushion 2 thus merges directly into the material of the front cushion 3 at the side edge 6 which can form, for example, a lower edge of a pocket.
In other embodiments of the present invention that are not shown, the back cushion 2 and the front cushion 3 can also be formed separately and connected to one another at the side edge 6. Furthermore, it is possible that, in other embodiments of the present invention, at least one piece of material is provided between the back cushion 2 and the front cushion 3 and connected to the side edges 4, 5 and/or 6. The piece of material can, for example, be strip-like or web-like.
Date Recue/Date Received 2022-08-04 A cavity 7 is formed between the back cushion 2 and the front cushion 3, into which the packaged good 15 is inserted, as can be seen in Figure 2.
In the embodiment shown in Figs. 1 and 2, the back cushion 2 has a back cushion section 21 protruding from the front cushion 3 on one side. In other embodiments of the present invention, a closure flap can also be connected to one side to the back cushion 2. The protruding back cushion section 21 or the closure flap, as indicated schematically by the arrow A in Fig. 2, is folded onto a surface of the front cushion 3 to close the cavity 7 and is connected directly or indirectly to it. The protruding back cushion section 21 or the closure flap can, for example, be glued to the front cushion 3 by means of adhesive lines.
Adhesive tufts may be used for this as well.
The back cushion 2 and the front cushion 3 each comprise a bag 8. The bag 8 encloses a fibrous material 9 in a tube-like manner. As can be seen in Figure 4, at least one compartment 18 may be provided instead of the bag 8 in which the fibrous material 9 is located. Compared to the bag 8, the compartment 18 is not completely formed around the fibrous material 9 but can be closed in advantageous variants of the invention.
In the thermal container 1 shown in Figures 1 and 2, the fibrous material 9 is used, which is shown schematically in Figure 3 in a sectional side view that is not to scale.
The fibrous material 9 consists of a stack of a plurality of individual layers made from creped fibrous material lying flat one above the other. What is special about the creped fibrous material used here is that it is so-called high crepe. The creped fibrous material used therefore has a particularly high crepe height d of 0.3 mm, for example of 0.35 mm, per individual layer 91. In some embodiments of the present invention, the crepe height d is even greater, for example 0.5 mm or even 0.65 mm. In the material used, which is cellulose wadding in the exemplary embodiment shown, the crepe height d of Date Recue/Date Received 2022-08-04 0.65 mm leads to an elongation of 80% which in turn corresponds to a crepe factor of 44%.
High crepe is a very thin material which can also have holes, In the exemplary embodiment shown, the grammage of the creped fibrous material used is 23 grams per square meter, but can also be different in other embodiments of the invention.
In the embodiment shown, the coefficient of static friction between one of the individual layers 91 and a layer of the paper, from which the paper shreds 92 are formed, is greater by at least a factor of 1.34 than the coefficient of static friction between two layers of the paper from which the paper shreds 92 are formed. This was tested as follows:
A flat mat was used for each of the test measurements; this was checked by means of a water level. In test measurements (a) the mat was covered in each case with one layer of the paper, from which the paper shreds 92 are formed;
in test measurements (b) it was covered in each case with a polypropylene film; in test measurements (c) it was covered in each case with a layer of cardboard; and in test measurements (d) it was covered in each case with one of the creped individual layers 91, here with high crepe. Furthermore, a planar surface of a measuring body was covered with a layer of the paper from which the paper shreds 92 are formed. The dimensions of the measuring body consisting of beech wood are 10 cm x 10 cm x 1.8 cm.
The covered measuring body was placed on the covered mat. The mat was then raised on one side until the measuring body moved. The height by which the mat was raised until the measuring body moved was measured and recorded. The following measured values resulted:
Date Recue/Date Received 2022-08-04 Friction pairing Measured Measured Measured values test 1 values test 2 values test 3 (a) Paper/paper 27.2 28.0 27.2 (b) Paper/polypropylene 17,1 19.3 18.0 film (c) Paper / cardboard 27.7 32.0 27.0 joifqper / high crepe 37.8 38.1 36.5 Table 1: Measured values from static friction test In the exemplary embodiment shown, the creped fibrous material was produced in the following way:
The base material that was used is recycled cellulose wadding from selected waste paper qualities in accordance with DIN EN 643.
After a wet pulping process and removal of non-paper components, but without additional bleaching, the recycled cellulose wadding was creped out on a Yankee cylinder by means of a ceramic-coated steel scraper.
In order to achieve the high crepe height d and thus a high volume of the stack formed from the individual layers 91, the adhesion of the cellulose fibers to the cylinder surface, the geometry of the scraper as well as the angle of attack of the scraper and the draft angle of the creped cellulose wadding web are specifically adjusted. The elongation or the crepe factor is produced accordingly by the difference in speed between the Yankee cylinder and the reel-up.
After creping, the individual layers 91 are doubled, for example to form a plurality of stacks with 4 individual layers 91 each. This is preferably done on a laying machine. The individual layers 91 typically lie one above another in the same layer generation direction. However, since the creping never lies exactly one above the other, the stacking of the individual layers 91 results in a correspondingly high stack height and at the same time a high stack volume.
Date Recue/Date Received 2022-08-04 In principle, however, it is also conceivable to place the individual layers one above the other with an alternating alignment so that the creping crosses from individual layer 91 to individual layer 91 or so that the respective creping of the individual layers 91 crosses.
Paper shreds 92 are then scattered onto one of the stacks of the individual layers 91 and a further stack of the individual layers 91 is placed on this layer of paper shreds. This process can be repeated several times so that, as a result, a stack of the creped individual layers 91 is formed with at least one layer of the paper shreds 92, each arranged between two of the individual layers 91'.
The creped individual layers 91' on either side of the layer of paper shreds 92, each of which creped individual layers can have the same creping but also a different creping from the other individual layers 91, have a crepe height d <
mm, preferably <0.6 mm, in certain cases of < 0.4 mm.
The stack produced in this way is/can then be cut into the desired width depending on the size of the back cushion 2 and the front cushion 3.
Subsequently, the stack is enclosed within the bag 8.
In the exemplary embodiment shown in Figures 1, 2 and 3, the bag 8 consists of a polypropylene spunbond with which the stack of the individual layers 91 and the paper shreds 92 is enclosed in a tube-like manner. The polypropylene spunbond ensures cohesion of the individual layers 91, 911 and of the paper shreds 92.
The proportion of the bag 8 in relation to the total weight of the thermal container 1 is not more than 4 wt.%. Thus, according to Art. 16(3) of the German Packaging Act (VerpackG), the thermal container 1 can be fully credited against the quota of paper. This results in disposal cost savings.
Date Recue/Date Received 2022-08-04 As shown schematically in Figure 1, the bag 8 can be fastened to the creped fibrous material 9, which is located outside in the stack, by means of lines of hotmelt adhesive placed at a distance from one another. These lines are, for example, approximately 20 mm apart and extend along the material web from which in each case the back cushion 2 and the front cushion 3 are formed.
It is advantageous if this material web has areas filled with the fibrous material 9 and adjoining pure fleece areas. Then, a fleece area, which adjoins a back cushion section of the material band, can be used as a closing flap for closing the thermal container 1. A fleece protrusion over the areas filled with the fibrous material 9 can, for example, be approximately 50 mm.
In order to form the back cushion 2 and the front cushion 3 from the material web, the latter is cut transversely to its web running direction.
Subsequently, a section of the area of the separated material web piece filled with the fibrous material 9, which later forms the front cushion 3, is folded over the rest of this material web piece that forms the back cushion. The side edges 4, 5 are then sewn and/or glued and/or crimped together. The crimping is preferably carried out by means of gears. The gluing can be dispensed with.
Figure 4 schematically shows another embodiment of a thermal container 1' according to the invention in a perspective side view.
The thermal container 1' comprises an outer paper bag 11 and an inner paper bag 12 located in the outer paper bag 11. Fibrous material 9, which is constructed as described above, is inserted between the inner paper bag 12 and the outer paper bag 11 on at least two opposite sides of the thermal container 1'.
Date Recue/Date Received 2022-08-04 The inner paper bag 12 and the outer paper bag 11 are connected to one another while including the fibrous material 9.
Carrying handles 14 are provided on an upper side of the thermal container 1'.
Suitable closure means may also be provided on the thermal container 1'.
As shown, the thermal container 1' may have a block bottom 19 but may also be designed without the block bottom 19.
In the described embodiments, hemp shreds can be used instead of the paper shreds 92 or in addition to the paper shreds 92.
Date Recue/Date Received 2022-08-04
Claims (6)
1. A thermal container (1, 1') comprising at least one flat back cushion (2) and a flat front cushion (3) extending in a different plane above the back cushion (2), said cushions being connected to one another at opposite side edges (4, 5) as well as at a further side edge (6) of the thermal container (1, 1') or being integrally formed or transitioning into one another via a connecting piece, so that a cavity (7) is formed between the back cushion (2) and the front cushion (3), the back cushion (2) and the front cushion (3) each being formed from at least one bag (8) or at least one compartment (18) and a fibrous material (9) located in the at least one bag (8) or the at least one compartment (18), wherein the fibrous material (9) comprises a stack of a plurality of individual layers (91) made from creped fibrous material lying flat one above the other, characterized in that the fibrous material (9) further comprises at least one layer of randomly oriented loose paper shreds (92) and/or hemp shreds, which layer is not separately enclosed and is arranged in each case between two of the individual layers (91') formed from unordered fibers and each having a crepe height (d) 0.3 mm and < 1 mm.
2. The thermal container according to Claim 1, characterized in that a coefficient of static friction between one of the individual layers (91) and a layer of the paper, from which the paper shreds (92) are formed, is greater by at least a factor of 1.1 than the coefficient of static friction between two layers of the paper from which the paper shreds (92) are formed.
3. The thermal container according to at least one of the preceding claims, characterized in that the crepe height (d) of the respective individual layers (91'), between which the respective layer of the paper shreds (92) and/or hemp shreds is arranged, is < 0.4 mm.
4. The thermal container according to at least one of the preceding claims, characterized in that the paper shreds (92) are made from shredded or chopped paper and/or the hemp shreds are made from shredded or chopped hemp.
5. The thermal container according to at least one of the preceding claims, characterized in that the paper shreds (92) and/or the hemp shreds have a width in a range of 0.5 cm to 1 cm.
6. The thermal container according to at least one of the preceding claims, characterized in that the at least one bag (8) or the at least one compartment (18) of the back cushion (2) as well as the at least one bag (8) or the at least one compartment (18) of the front cushion (3) are made from a fleece made of thermoplastic material and/or from paper.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021120900.5 | 2021-08-11 | ||
| DE102021120900.5A DE102021120900B4 (en) | 2021-08-11 | 2021-08-11 | Thermal container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3169570A1 true CA3169570A1 (en) | 2023-02-11 |
Family
ID=82557961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3169570A Pending CA3169570A1 (en) | 2021-08-11 | 2022-08-04 | Thermal container |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4134329B1 (en) |
| CA (1) | CA3169570A1 (en) |
| DE (1) | DE102021120900B4 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050118366A1 (en) * | 2003-06-25 | 2005-06-02 | Piemonte Robert B. | Barrier materials and containers made therefrom |
| WO2019113453A1 (en) * | 2017-12-08 | 2019-06-13 | Ranpak Corp. | Insulated package and method |
| US11247446B2 (en) * | 2018-10-01 | 2022-02-15 | Triple Point Innovations Llc | Re-pulpable insulated paper products and methods of making and using the same |
| WO2020263149A1 (en) | 2019-06-24 | 2020-12-30 | Ifoodbag Ab | A bag |
| DE202019104350U1 (en) | 2019-08-07 | 2020-11-10 | Profümed Karlheinz Lohr e. K. | Thermal container |
| DE202019003407U1 (en) | 2019-08-19 | 2019-11-25 | THlMM Verpackung GmbH + Co. KG | Packaging for receiving and / or transporting temperature-sensitive products and cutting set therefor |
-
2021
- 2021-08-11 DE DE102021120900.5A patent/DE102021120900B4/en active Active
-
2022
- 2022-07-04 EP EP22182890.8A patent/EP4134329B1/en active Active
- 2022-08-04 CA CA3169570A patent/CA3169570A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP4134329B1 (en) | 2023-09-27 |
| DE102021120900B4 (en) | 2024-01-25 |
| DE102021120900A1 (en) | 2023-02-16 |
| EP4134329A1 (en) | 2023-02-15 |
| EP4134329C0 (en) | 2023-09-27 |
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