Insulating packaging and methods for its manufacture

Abstract

Insulating packaging (100) comprising at least one outer layer (110) of paper and at least one inner layer (130) of heat-insulating material, wherein the outer layer (110) has at least two parts (111, 112; 111A, 111B) that at least largely surround the inner layer (130), wherein the inner layer (130) is formed from a shredded paper or cardboard material, and wherein the at least two parts (111, 112; 111A, 111B) of the outer layer (110) are joined by means of at least one interlocking embossing (116, 117, 151, 152), wherein the interlocking embossing (116, 117, 151, 152) is designed as knurling, and wherein the areas of the interlocking embossing are primed with a fluid, in particular water or water-diluted fluid, before the embossing is applied. Dispersion adhesive, be wetted.

Description

TECHNICAL AREA

[0001] The present invention relates to an insulated packaging, in particular for shipping foodstuffs, and a method for its manufacture. STATE OF THE ART

[0002] A shipping bag is known from CH 540828 A in which an outer layer of paper is bonded to an inner lining made of plastic. The bubble wrap preferably used as the inner lining also has a certain insulating effect, but for recycling purposes it must be separated from the outer paper layer by a laborious tearing process.

[0003] From DE 10 2021 120 900 A1, an insulating packaging is known which consists of a front cushion and a back cushion, the pocket-shaped receiving pouches of which are filled with a fibrous material containing, for example, paper scraps. The front and back cushions are sewn, glued, or crimped together at the side edges using gears.

[0004] Based on the prior art described above, the object of the present invention is to provide an insulating package that offers good thermal insulation, allows for simple and environmentally sound disposal after use, and exhibits increased tear resistance. Furthermore, a method for manufacturing such a package is to be provided. REVELATION OF THE INVENTION

[0005] The problem is solved with an insulating packaging according to claim 1 and a method according to claim 11. Further developments of the invention are the subject of the dependent claims.

[0006] According to the invention, an insulating packaging with at least one outer layer of paper and at least one inner layer of heat-insulating material is characterized in that the outer layer has at least two parts that at least largely and preferably completely surround the inner layer, wherein the inner layer is formed from a shredded paper or cardboard material, and the at least two parts of the outer layer are connected by means of at least one, preferably two, material-interlocking embossings, wherein the material-interlocking embossing is designed as a knurling and wherein the areas of the material-interlocking embossings are moistened with a fluid, in particular water or water-diluted dispersion adhesive, before the embossings are applied.

[0007] Because the inner layer also consists of heat-insulating material made of paper or cardboard, the insulating packaging according to the invention can be returned directly to the paper recycling process after use without further separation.

[0008] The material-bonded embossing results in very high tear resistance, which has been confirmed in tests with loads of up to 25 kg. This makes the insulated packaging according to the invention very suitable even for heavier goods, especially frozen or chilled products.

[0009] According to the invention, the material-locking embossing is designed as knurling. The knurling interlocks the fibers of two superimposed layers of the outer layer by means of the interlocking gears. Prior moistening in the areas of the form-locking embossing ensures an even stronger bond. This moistening is achieved using a fluid, which in particular contains water and / or a dispersion adhesive.

[0010] Particularly preferably, the inner layer is at least partially bonded or connected to the outer layer by means of a fluid, which in particular comprises water and / or a dispersion adhesive. The mixing ratio between water and dispersion adhesive is preferably at least 2 parts water to 1 part dispersion adhesive, more preferably at least 4 parts water to 1 part dispersion adhesive, and particularly preferably at least 6 parts water to 1 part dispersion adhesive. This facilitates handling during further processing of the insulating packaging by ensuring a more homogeneous application of the insulating material and prevents the insulating material of the inner layer from shifting unevenly to certain areas during use of the insulating packaging, which could result in insufficient insulation in other areas.

[0011] According to an advantageous embodiment of the invention, the inner layer is applied to the first part of the outer layer, and the second part of the outer layer is designed to be foldable by 180° over the first part at a second fold line, wherein the second part, in its folded state, partially or completely covers the inner layer on the side facing away from the first part. This ensures that the inner layer is completely enclosed by the outer layer, preventing any paper dust from the shredded paper or cardboard material from escaping.

[0012] As an alternative to producing the first and second parts of the outer layer by folding a single paper web, the first and second parts of the outer layer can also be formed by two separate paper webs enclosing the inner layer between them. In this case, a fold line between the first and second parts of the outer layer is replaced by a transverse, interlocking embossing, preferably formed by a transverse knurling.

[0013] According to a further advantageous embodiment of the invention, a third part of the outer layer is designed as an overlapping section, foldable by 180° over the first part at a first fold line that runs parallel to the second fold line, wherein the overlapping section covers the inner layer, particularly partially, and is covered by the second part, particularly completely. This variant represents a paper-saving version of an insulated packaging according to the invention, in which a tight covering of the inner layer is achieved without transverse knurling.

[0014] The first part of the outer layer and at least the second part of the outer layer, together with the inner layer lying between them, are preferably folded along a third fold line to form a pocket-shaped receiving space. This third fold line is preferably arranged centrally with respect to the longitudinal extent of the inner layer and is aligned parallel to the second fold line. The pocket-shaped receiving space is thereby surrounded on all sides by at least two layers of the outer layer and an inner layer located between these two layers, and is thus excellently insulated against the transmission of heat.

[0015] Particularly advantageously, at least one, preferably two, of the interlocking embossed features, in the form of longitudinal knurling, connects the first part and the second part of the outer layer close to a lateral edge of the insulating packaging but outside the inner layer, running parallel to the direction of a longitudinal axis of the insulating packaging. The interlocking embossed features also ensure high tear resistance of the insulating packaging laterally.

[0016] The tear resistance of the insulating packaging can be further increased if at least one material-locking embossing runs transversely to a longitudinal axis of the insulating packaging, connecting the first part and the second part of the outer layer.

[0017] An additional increase in tear resistance is achieved by folding at least one side strip, located near the lateral edge of the insulating packaging and featuring a material-locking embossing, over to the back of the insulating packaging and bonding it at least at specific points using an adhesive, in particular a dispersion adhesive. The mixing ratio between water and dispersion adhesive is preferably a maximum of 3 parts water to 1 part dispersion adhesive, more preferably a maximum of 2 parts water to 1 part dispersion adhesive, and particularly preferably a maximum of 1 part water to 1 part dispersion adhesive. The dispersion adhesive is preferably the same dispersion adhesive used to bond the inner layer to the outer layer.

[0018] A highly stable insulated package is preferably also characterized by the fact that the outer layer is made of Clupak paper or kraft paper that has been pre-shrunk under the influence of moisture.

[0019] A method according to the invention for producing an insulating package is characterized by the following process steps: - Laying out an outer layer in a plane, - Applying a fluid, which in particular contains water and / or a dispersion adhesive, to a first part of the outer layer and at least to a partial area of ​​a second part of the outer layer, - Applying an inner layer of heat-insulating material to at least a portion of the fluid-containing first part of the outer layer, - preferably folding over an overlapping part arranged on the first part of the outer layer at a first fold line over at least a part of the inner layer, - Applying, in particular, a second part of the outer layer over the first part of the outer layer and preferably the overlapping part, - Folding the package, consisting of the first part of the outer layer, the inner layer and at least the second part of the outer layer, around a third fold line, preferably running centrally in the inner layer parallel to the second fold line, to form a pocket-shaped receiving space, - Introducing at least one material-bonding embossing which connects the first part and the second part of the outer layer parallel to both lateral edges, but outside the inner layer in the longitudinal direction of the insulating packaging, - Folding at least one side strip with a material-locking embossing onto the back of the insulating packaging and at least partially bonding the side strip to the back using an adhesive, in particular an optionally water-diluted dispersion adhesive.

[0020] According to a first alternative, the application of the second part of the outer layer is done over the first part of the outer layer and the overlapping part by folding the second part of the outer layer over a second fold line.

[0021] According to a second alternative, the second part of the outer layer is applied over the first part of the outer layer and the overlapping part by laying on a separate paper web forming the second part, which is connected to the first part of the outer layer by a material-locking embossing running transversely to the longitudinal axis of the insulating packaging outside the inner layer.

[0022] According to another alternative, instead of folding over an overlapping part, a further, transversely to the longitudinal axis, material-locking embossing is provided, by which the first part is connected to the second part of the outer layer outside the inner layer.

[0023] It is particularly advantageous that the areas of the material-bonding embossing are moistened with a fluid, especially water or water-diluted dispersion adhesive, before the embossing is applied. This moistening ensures a more intensive bond between the paper layers through improved fiber interlocking during embossing, particularly knurling. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Further features, advantages, and embodiments of the invention will become apparent from the following description of embodiments of an insulated package and a method particularly suitable for its manufacture, with reference to the figures. These show: Fig. 1A A top view of the back of a finished insulated package before filling and closing a flap, Fig. 1B A top view of the front of a finished insulated package before filling and closing the flap, Fig. 2 a top view of the unfolded first part and second part of an outer layer of an insulating packaging according to Fig. 1 with an inner layer of insulating material applied to the first part, Fig. 3. A side view of the insulating packaging during manufacturing after folding an overlapping part over the inner layer and folding the second part of the outer layer over it. Fig. 4 A side view of the insulating packaging during production after folding a package from the first part and second part of the outer layer with the inner layer in between to form a receiving space, but before the introduction of the material-locking embossings along the side edges, Fig. 5 an alternative to Fig. 3, in which the second part of the outer layer is formed by a separate paper web which is connected to the first part of the outer layer by means of additional material-bonding embossing, and Fig. 6 an alternative embodiment in which the first part and the second part of the outer layer are formed from a single longitudinally folded paper web, which, after application of the inner layer to a first part, is folded and closed to form a tube by means of a material-locking embossing extending longitudinally on one side. FORMS OF EXECUTION OF THE INVENTION

[0025] Fig. Figure 1A shows a top view of the reverse side of a finished insulating package 100. Two side strips 103, 104, running parallel to a longitudinal axis L, are each provided with a material-interlocking embossing 151, 152 and folded over to the reverse side of the insulating package 100. The folded-over side strips 103, 104 are bonded to the reverse side of the insulating package 100 by several mutually bonded adhesive dots or a continuous or sequentially interrupted bead of adhesive. The adhesive dots or the bead of adhesive are not shown and are preferably formed by a water-soluble dispersion adhesive.

[0026] The front of the insulated packaging 100, however, is as shown in Fig. Figure 1B shows a smooth, smooth-formed closure flap 122, which is connected to an outer layer 110 via a fold line 123. After the finished insulating packaging 100 is filled, the closure flap 122 is folded over at the fold line 123 and attached to the front of the insulating packaging 100, for example by means of an adhesive strip.

[0027] Fig. 2 shows a first alternative for producing a in Fig. The insulating packaging 100 shown in Figure 1. For this purpose, a section of a single continuous paper web is laid out in a plane as the outer layer 110 and preferably cut to the required length. The outer layer 110 has a first part 111 and a second part 112.

[0028] In the example shown, an overlapping section 113 adjoins the first section 111 on its left side. The length of the overlapping section 113 in the direction of the longitudinal axis L is preferably approximately one quarter to one half of the length of the first section 111.

[0029] On the right side of the second part 112, a closure flap 122 is attached, which is later folded onto the front of the finished insulating packaging 100 after it has been filled, and fixed there, for example, by means of an adhesive strip not shown.

[0030] A spray area 118, shown in dashed-dotted lines, extends in the direction of the longitudinal axis L over the central areas of the overlapping part 113, the first part 111, and approximately half of the second part 112, preferably leaving an edge strip 103 or 104 free. During manufacturing, the spray area 118 can be delimited by a first auxiliary frame that can be placed on the paper web of the outer layer 110, wherein the outer layer 110 in the spray area is uniformly moistened with a fluid by means of a spray device (not shown). This fluid is pure water or a mixture of water and a dispersion adhesive, for example, in a mixing ratio of 6 parts water to 1 part dispersion adhesive. The fluid layers 119 are in Fig. 3 indicated by fine dotted lines.

[0031] After moistening the spray area 118, the first auxiliary frame is removed and a second auxiliary frame (not shown) is placed on the central area of ​​the first part 111. A layer of paper or cardboard material, preferably shredded by an eddy current mill, approximately 20 mm thick, is applied to this second auxiliary frame as a heat-insulating inner layer 130. Because the inner layer 130 is located entirely within the spray area 118, at least the lower layer of the inner layer 130 bonds with the first part 111 of the outer layer 110. This largely prevents the inner layer 130 from shifting later.

[0032] After the inner layer 130 has been applied, the second auxiliary frame is removed, and then the overlap section 113 is folded over the left part of the inner layer 130 along a first fold line 114 running transversely to the longitudinal axis L. Since the overlap section 113 is also moistened by the fluid in the spray area 118, the inner layer 130 bonds with the inside of the overlap section 113 on its upper side.

[0033] In the next step, the second part 112 of the outer layer 110 is folded over the inner layer 130 located on the first part 111 and the partially overlapping part 113 at a second fold line 115 running transversely to the longitudinal axis L. Since the part of the second part 112 of the outer layer 110 adjacent to the second fold line 115 is also wetted by the fluid applied in the spray area 118, this part also bonds with the top surface of the inner layer 130.

[0034] As in Fig. As can be seen in Figure 3, preferably a part of the second part 112 of the outer layer 110, which is folded over the overlapping part 113, is also wetted with the fluid. This creates a connection between the overlapping part 113 and the second part 112 of the outer layer 110 to securely hold the inner layer 130.

[0035] The inner layer 130 is, as in Fig. 3 shown, after folding in the overlapping part 113 and folding over the second part 112, completely surrounded by the outer layer 110 and fixed at the top and bottom by the fluid layers 119.

[0036] Then the in Fig. 3. The package shown, consisting of first part 111, inner layer 130, overlapping part 113 and second part 112, is folded at a third fold line 125 running approximately in the middle of the inner layer 130 transversely to the longitudinal axis L to form a pocket-shaped receiving space 140, which is in Fig. 4 is shown. As from Fig. As can be clearly seen in Figure 4, the recording chamber 140 is surrounded downwards and on both sides by at least three layers of the outer layer 110 and the inner layer 130 embedded between them.

[0037] The single layer remaining is the closure flap 122 extending beyond the receiving space 140, which serves to close the receiving space 140 after it has been filled with the transported goods and which, for this purpose, is attached to the front of the insulating packaging 100 after being folded over, for example by means of an adhesive strip.

[0038] The receiving chamber 140 is laterally closed by the two longitudinally extending, interlocking embossed features 151 and 152 on the side strips 103 and 104, respectively. After closure by the interlocking embossed features 151 and 152, the inner layer 130 is completely enclosed.

[0039] In Fig. 5 shows a second variant of an insulated packaging 100, in which one of the Fig. 3. A corresponding intermediate product is formed by joining a first part 111 of an outer layer 110 from a first paper web and a second part 112 of an outer layer 110 from a second paper web, including an inner layer 130 whose structure corresponds to that of the first embodiment. The parts 111 and 112, trimmed to the desired dimensions, are preferably joined longitudinally at their front and rear ends by means of transverse, material-interlocking embossing 116 and 117, respectively. The closing flap 122, for example, extends beyond one of the embossings 116. After folding around the transverse fold line 125, a new, [unclear] product is formed. Fig. 4 corresponding package with a receiving space 140, which is subsequently connected by two longitudinally extending material-locking embossings 151 and 152, respectively, analogous to the Fig. The side strips 103 and 104 arranged in the first variant are laterally sealed. It is understood that, in this second variant as well, both surfaces of the two parts 111 and 112 that come into contact with the inner layer 130 can be pre-wetted. The side strips 103 and 104 can be sealed as in Fig. 1. To further increase tear resistance, fold over to the back of the insulating packaging 100 and glue it in spots or strips.

[0040] In a third, in Fig. In the variant shown in Figure 6, a first part 111A and a second part 111B of the outer layer 110 are produced by folding a single paper web lengthwise along a longitudinal axis L, particularly one running centrally, after the inner layer 130 has been applied to one half 111A. Subsequently, both parts 111A and 111B are joined near their open outer surface by means of a longitudinal, interlocking embossing 151 to form a tube-like intermediate product. This intermediate product is then processed analogously to the Fig. 4. The inner layer 130 is folded along a transverse fold line 125 in the center to form a package with a receiving space 140 and sealed on the long sides by means of interlocking embossing. In this third variant as well, both surfaces of the two parts 111A and 111B that come into contact with the inner layer 130 are first moistened.

[0041] The material of the inner layer 130 is generally preferably produced from shredded paper or cardboard by dry fiberization using a micro-impact mill or eddy current mill. This process yields particles approximately the size of small balls of wool. These are thus significantly larger than the particles produced according to German patent DE 10 2015 223 333 B4 of TU Dresden. Due to the coarser fiberization, the resulting particles interlock more effectively, so that the inner layer 130 holds together well and individual particles do not shift within the surrounding outer layer 110. Much less paper dust is also generated, which significantly improves working conditions during the application of the inner layer.

[0042] The inner layer 130 is approximately 20 mm thick in its raw state, so that a finished insulated package 100, after slight compression of the inner layer 130, has a thickness of approximately 35 to 40 mm. The layer thickness can also vary depending on the season, ambient temperature, temperature of the intended transport container or cargo space, the goods being transported, and the planned transport duration. For particularly high demands on the stability of the insulated package and / or its insulating properties, it can also have two or more outer layers, between which further inner layers of insulating material can be provided if necessary.

[0043] The method according to the invention can be carried out manually using several workstations connected in series. In this case, it is advantageous to use auxiliary tools, such as stops, gauges, or auxiliary frames, when cutting the paper web, applying the fluid in the spray area, and applying the inner layer 130. However, fully automated production is also possible, in which the transport and folding of the paper webs, the application of the fluids and adhesives, and the insertion of the inner layer 130 are carried out continuously by machine according to precise coordinates. The inner layer 130 can then, for example, be prepared laterally to the main flow direction and pushed onto the outer layer 110.

[0044] An insulated packaging 100 according to the invention is not only suitable for shipping chilled or heated food or other goods, such as chilled pharmaceuticals or medical materials, but also for shipping sensitive, sharp-edged or fragile goods, for which envelopes with a plastic air cushion lining have previously been used.

Claims

[1] Insulating packaging (100) comprising at least one outer layer (110) of paper and at least one inner layer (130) of heat-insulating material, wherein the outer layer (110) has at least two parts (111, 112; 111A, 111B) that at least largely surround the inner layer (130), wherein the inner layer (130) is formed from a fiberized paper or cardboard material, and the at least two parts (111, 112; 111A, 111B) of the outer layer (110) are joined by means of at least one interlocking embossing (116, 117, 151, 152), wherein the interlocking embossing (116, 117, 151, 152) is designed as knurling, and wherein the areas of the interlocking embossing are coated with a fluid, in particular water, before the embossing is applied. be moistened with diluted dispersion adhesive. [2] Insulating packaging (100) according to claim 1, characterized bythat the inner layer (130) can be at least partially connected or joined to the outer layer (110) by means of a fluid which in particular contains water and / or a dispersion adhesive. [3] Insulating packaging (100) according to at least one of the preceding claims, characterized by , that the inner layer (130) is applied to the first part (111; 111A) of the outer layer (110) and the second part (112; 111B) of the outer layer (110) is designed to be foldable by 180° over the first part (110; 111A) at a second fold line (115), wherein the second part (112; 111B) in the folded state covers the inner layer (130) in some areas or completely on the side facing away from the first part (111; 111A). [4] Insulating packaging (100) according to at least one of claims 1 to 2, characterized by, that the first part (111) of the outer layer (110) and the second part (112) of the outer layer (110) are formed by two separate paper webs enclosing the inner layer (130) between them. [5] Insulating packaging (100) according to at least one of the preceding claims, characterized by , that a third part of the outer layer (110) is designed as an overlapping part (113) at a first fold line (114) which runs parallel to the second fold line (115) and is foldable by 180° over the first part (111), wherein the overlapping part (113) covers the inner layer (130), in particular partially, and is covered by the second part (112), in particular completely. [6] Insulating packaging (100) according to any one of claims 3 to 5, characterized by, that the first part (111; 111A) of the outer layer (110) and at least the second part (112; 111B) of the outer layer (110) are folded with the inner layer (130) lying between them to form a pocket-shaped receiving space (140) at a third fold line (125), wherein the third fold line (125) is preferably arranged centrally with respect to the longitudinal extent of the inner layer (130) and is aligned parallel to the second fold line (115). [7] Insulating packaging (100) according to any one of the preceding claims, characterized by , that at least one of the material-interlocking embossings (151, 152) close to a lateral edge (101, 102) of the insulating packaging (100), but outside the inner layer (130) and running parallel to the direction of a longitudinal axis (L) of the insulating packaging (100) connects the first part (111; 111A) and the second part (112; 111B) of the outer layer (110). [8] Insulating packaging (100) according to any one of the preceding claims, characterized by , that at least one material-locking embossing (116, 117) extending transversely to a longitudinal axis (L) of the insulating packaging (100) connects the first part (111; 111A) and the second part (112; 111B) of the outer layer (110). [9] Insulating packaging (100) according to any one of the preceding claims, characterized by , that at least one side strip (103, 104) arranged near the lateral edges (101, 102) of the insulating packaging (100) and having a material-locking embossing (151, 152) is folded over to a back side of the insulating packaging (100) and is bonded to it at least at points by means of an adhesive, in particular a dispersion adhesive. [10] Insulating packaging (100) according to any one of the preceding claims, characterized by , that the outer layer (110) is made of Clupak paper or kraft paper. [11] Method for manufacturing an insulating packaging (100), in particular according to one of the preceding claims, characterized by the following procedural steps - Laying out an outer layer (110) in a plane, - Applying a fluid, which in particular comprises water and / or a dispersion adhesive, to a first part (111) of the outer layer (110) and to at least a partial area of ​​a second part (112) of the outer layer (110), - Applying an inner layer (130) of heat-insulating material to at least a partial area of ​​the fluid-containing first part (111) of the outer layer (110), - Overlapping an overlapping part (113) arranged on the first part (111) of the outer layer at a first fold line (114) over at least a part of the inner layer (130), - Applying a second part (112) of the outer layer (110) over the first part (111) of the outer layer (110) and the overlapping part (113), - Folding the package consisting of the first part (111) of the outer layer (110), the inner layer (130) and at least the second part (112) of the outer layer (110) around a third fold line (125) preferably running centrally in the inner layer (130) parallel to the second fold line (115) to form a receiving space (140), - Introducing at least one material-bonding embossing (151, 152) which connects the first part (111) and the second part (112) of the outer layer (110) parallel to both lateral edges (101, 102), but outside the inner layer (130) in the longitudinal direction of the insulating packaging (100), - Folding at least one side strip (103, 104) provided with a material-locking embossing (151, 152) onto the back of the insulating packaging (100) and at least partially bonding the side strip (103, 104) to the back by means of an adhesive, in particular a water-diluted dispersion adhesive. [12] Method for producing an insulating packaging (100) according to claim 11, characterized by , that the application of the second part (112) of the outer layer (110) over the first part (111) of the outer layer (110) and the overlapping part (113) is carried out by folding over the second part (112) of the outer layer (110) at a second fold line (115). [13] Method for producing an insulating packaging (100) according to claim 11, characterized by, that the application of the second part (112) of the outer layer (110) over the first part (111) of the outer layer (110) and the overlapping part (113) is carried out by laying on a separate paper web forming the second part (112), which is connected to the first part (111) of the outer layer (110) by a material-locking embossing (116) running transversely to the longitudinal axis (L) of the insulating packaging (100) outside the inner layer (130). [14] Method for producing an insulating packaging (100) according to claim 11, characterized by , that instead of folding over an overlapping part (113), a material-locking embossing (117) extending transversely to the longitudinal axis (L) is provided, by which the first part (111) is connected to the second part (112) of the outer layer (110) outside the inner layer (130). [15] Method for producing an insulating packaging (100) according to claims 11 to 14, characterized by, that the areas of the material-bonding embossings (116, 117, 151, 152) are moistened with a liquid, in particular water and / or a water-soluble dispersion adhesive, before the embossings (116, 117, 151, 152) are applied.

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