Insulated packaging and process for its manufacture

Abstract

The invention relates to an insulating packaging (100) with an outer layer (110) made of paper and an inner layer (130) made of heat-insulating material. According to the invention, 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, in particular fiberized, paper or cardboard material or a tissue material, and the at least two parts (111, 112; 111A, 111B) of the outer layer (110) are connected by means of at least one material-locking embossing (116, 117, 151, 152). The invention further relates to a method for producing an insulating packaging.

Description

TECHNICAL FIELD

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

[0002] CH 540828 A discloses a shipping bag in which an outer layer of paper is bonded to a plastic inner lining. The bubble wrap preferred 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] Based on the above-mentioned prior art, the object of the present invention is to provide an insulating packaging that offers good thermal insulation and allows for simple, environmentally friendly disposal after use. Furthermore, a method for producing such a packaging is to be provided. DISCLOSURE OF THE INVENTION

[0004] The object is achieved with an insulating packaging according to claim 1 and a method according to claim 12. Further developments of the invention are the subject of the dependent claims.

[0005] According to the invention, an insulating packaging with at least one outer layer made of paper and at least one inner layer made of heat-insulating material is characterized in that the outer layer has at least two parts which surround the inner layer at least largely and preferably completely, wherein the inner layer is formed from a shredded, in particular fiberized, paper or cardboard material or a tissue material, and the at least two parts of the outer layer are connected by means of at least one, preferably two, material-locking embossings.

[0006] The term “tissue material” refers to a single- or multi-layered natural fiber cloth creped at high temperature on a crepe cylinder, whereby the layers can also have small air chambers created by additional embossing.

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

[0008] The material-to-material embossing creates a very high tear resistance, which has been confirmed in tests with up to 25 kg. This makes the insulated packaging according to the invention also very suitable for heavier goods, especially frozen or refrigerated ones.

[0009] In a preferred embodiment of the present invention, the material-locking embossing is designed as knurling. The knurling interlocks two superimposed layers of the outer layer with their fibers by means of the intermeshing gears. Pre-moistening the areas of the form-locking embossing ensures an even more intensive bond. Moistening can be achieved using a fluid, which in particular comprises water and / or a dispersion adhesive.

[0010] Particularly preferably, the inner layer is at least partially bondable or bonded 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, preferably at least 4 parts water to 1 part dispersion adhesive, particularly preferably at least 6 parts water to 1 part dispersion adhesive. This facilitates handling during further processing of the insulating packaging due to a more homogeneous application of the insulating material and prevents the insulating material of the inner layer from moving unevenly into certain areas during use of the insulating packaging, which could result in a lack of insulation in other areas.

[0011] According to an advantageous development 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 180° over the first part along a second fold line. When folded, the second part partially or completely covers the inner layer on the side facing away from the first part. As a result, the inner layer is completely surrounded by the outer layer, preventing any paper dust from the shredded paper or cardboard material from escaping.

[0012] According to an alternative to the first and second parts of the outer layer being formed by folding a single paper web, the first and second parts of the outer layer can also be formed by two separate paper webs that sandwich 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, material-locking embossing, preferably formed by transverse knurling.

[0013] According to a further advantageous embodiment of the invention, a third part of the outer layer is designed as an overlapping part along a first fold line running parallel to the second fold line, foldable by 180° over the first part, wherein the overlapping part covers the inner layer, in particular in regions, and is covered by the second part, in particular completely. This variant represents a paper-saving version of an insulating packaging according to the invention, in which a tight wrapping 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 with the inner layer located between them are preferably folded along a third fold line to form a pocket-shaped receiving space, wherein the third fold line is preferably arranged centrally with respect to the longitudinal extent of the inner layer and aligned parallel to the second fold line. The pocket-shaped receiving space is thus 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 passage of heat.

[0015] Particularly advantageously, at least one, preferably two, of the material-locking embossments, in particular as 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 material-locking embossments also ensure high tear resistance of the insulating packaging laterally.

[0016] The tear-out strength of the insulating packaging can be further increased if at least one material-locking embossing extending transversely to a longitudinal axis of the insulating packaging connects 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 arranged near the lateral edges of the insulating packaging and having a material-locking embossing onto a back of the insulating packaging and bonding it to this at least in places 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, preferably a maximum of 2 parts water to 1 part dispersion adhesive, particularly preferably a maximum of 1 part water to 1 part dispersion adhesive. Furthermore, the dispersion adhesive is preferably the same dispersion adhesive used to bond the inner layer to the outer layer.

[0018] Insulated packaging with high stability 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 packaging is characterized by the following process steps: - Laying out an outer layer in one plane, - applying a fluid, which in particular comprises 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 first part of the outer layer provided with the fluid, - preferably folding an overlapping part arranged on the first part of the outer layer at a first fold line over at least part of the inner layer, - applying a particularly second part of the outer layer over the first part of the outer layer and preferably the overlap 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-locking 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 provided with a material-locking embossing onto the back of the insulating packaging and at least partially gluing the side strip to the back by means of an adhesive, in particular a dispersion adhesive optionally diluted with water.

[0020] According to a first alternative, the second part of the outer layer is applied over the first part of the outer layer and the overlapping part is formed by folding the second part of the outer layer along 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 applying 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 a further alternative, instead of folding over an overlapping part, a further material-locking embossing is provided which runs transversely to the longitudinal axis and by means of which the first part is connected to the second part of the outer layer outside the inner layer.

[0023] It is particularly advantageous to wet the areas of the material-bonded embossing with a fluid, particularly water or a dispersion adhesive diluted with water, before the embossing is applied. Wetting ensures a more intensive bond between the paper layers through better interlacing of the fibers during embossing, particularly through 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 insulating packaging and a method particularly suitable for its production, based on the figures. It shows: Fig. 1A a top view of the back of a finished insulating packaging before filling and closing a closure flap, Fig. 1B a plan view of the front of a finished insulating packaging before filling and closing the closure flap, Fig. 2 a plan view of the spread out 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 production after folding an overlap 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 embossing 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-locking embossings, and Fig. 6 an alternative embodiment in which the first part and the second part of the outer layer are formed from a single paper web folded in the longitudinal direction, 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 running on one side in the longitudinal direction. EMBODIMENTS OF THE INVENTION

[0025] Fig. 1A shows a plan view of the back of a finished insulating packaging 100. Two side strips 103, 104 running parallel to a longitudinal axis L are each provided with a material-locking embossment 151, 152 and folded over onto the back of the insulating packaging 100. The folded side strips 103, 104 are bonded to the back of the insulating packaging 100 by means of several spaced-apart adhesive dots or a continuous or sequentially interrupted adhesive bead. The adhesive dots or the adhesive bead are not shown and are preferably formed by a water-soluble dispersion adhesive.

[0026] The front of the insulating packaging 100 is, however, as in Fig. 1B, is smooth, with a closure flap 122 connected to an outer layer 110 via a fold line 123. After filling the finished insulating packaging 100, the closure flap 122 is folded over at the fold line 123 and connected to the front of the insulating packaging 100, for example by an adhesive strip.

[0027] Fig. 2 shows a first alternative for producing a Fig. 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 part 113 adjoins the left side of the first part 111. The length of the overlapping part 113 in the direction of the longitudinal axis L is preferably approximately one-quarter to one-half the length of the first part 111.

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

[0030] A spraying area 118, shown in dash-dotted lines, extends in the direction of the longitudinal axis L over the central regions of the overlapping part 113, the first part 111, and approximately half of the second part 112, with one edge strip 103 or 104 preferably remaining free. The spraying area 118 can be delimited during production by a first auxiliary frame that can be placed on the paper web of the outer layer 110, wherein the outer layer 110 is evenly moistened with a fluid in the spraying area by means of a spray device (not shown). This fluid is formed from pure water or from 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 subframe is removed and, instead, a second subframe (also not shown) is placed on the central area of ​​the first part 111. A second subframe, for example, approximately 20 mm thick, made of paper or cardboard material, preferably shredded using a cyclone mill, is applied to the subframe 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 is bonded to the first part 111 of the outer layer 110. This largely prevents the inner layer 130 from slipping later.

[0032] After applying the inner layer 130, the second subframe is removed, and then the overlapping part 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 overlapping part 113 is also moistened by the fluid in the spray area 118, the inner layer 130 also bonds to the inside of the overlapping part 113 at 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 overlapping part 113 partially located thereon along 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 to the upper side of the inner layer 130.

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

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

[0036] Afterwards, the Fig. 3, the package comprising the first part 111, inner layer 130, overlapping part 113 and second part 112 is folded along a third fold line 125 extending approximately in the middle of the inner layer 130 transversely to the longitudinal axis L to form a pocket-shaped receiving space 140, which Fig. 4. As can be seen from Fig. 4, the receiving space 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 closure flap 122, which projects beyond the receiving space 140, remains in a single layer and serves to close the receiving space 140 after the receiving space 140 has been filled with the transported goods. For this purpose, it is attached to the front of the insulating packaging 100 after folding over, for example by means of an adhesive strip.

[0038] The receiving space 140 is laterally closed by the two longitudinally extending material-locking embossments 151 and 152 on the side strips 103 and 104, respectively. After being closed by the material-locking embossments 151 and 152, the inner layer 130 is completely enclosed.

[0039] In Fig. 5 shows a second variant of an insulating packaging 100, in which one of the Fig. 3 corresponding intermediate product is created by joining a first part 111 of an outer layer 110 made of a first paper web and a second part 112 of an outer layer 110 made of a second paper web, including an inner layer 130 corresponding in structure to the first embodiment. The parts 111 and 112 trimmed to the desired size are preferably joined together at their front and rear ends in the longitudinal direction by means of a transversely running material-locking embossment 116 and 117, respectively. The closure flap 122 protrudes, for example, beyond one of the embossments 116. After folding around the transverse fold line 125, another Fig. 4 corresponding package with a receiving space 140, which is then connected by two longitudinal material-locking embossments 151 and 152 analogously to Fig. 1 arranged side strips 103 and 104. It is understood that in this second variant, too, both surfaces of the two parts 111 and 112 that come into contact with the inner layer 130 can be wetted in advance. The side strips 103 and 104 can be Fig. 1 To further increase the tear resistance, it must be folded over onto the back of the insulating packaging 100 and glued to it in spots or strips.

[0040] In a third, in Fig. 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 centrally extending longitudinal axis L, after the inner layer 130 has been applied to one half 111A. Subsequently, both parts 111A and 111B are joined together near their open outer side by means of a longitudinally extending material-locking embossing 151 to form a tubular intermediate product. This intermediate product is then again processed analogously to Fig. 4 is folded along a fold line 125 running transversely in the center of the inner layer 130 into a package with a receiving space 140 and sealed on the long sides by means of material-locking embossing. In this third variant, both surfaces of the two parts 111A and 111B that come into contact with the inner layer 130 are also pre-wetted.

[0041] The material of the inner layer 130 is generally preferably produced from shredded paper or cardboard material by dry shredding using a micro-impact mill or eddy current mill. This produces 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 the TU Dresden. Due to the coarser shredding, the resulting particles interlock better, so that the inner layer 130 holds together well and individual particles do not slip within the surrounding outer layer 110. Much less paper dust is also produced, which significantly improves the working conditions when applying the inner layer.

[0042] The thickness of the inner layer 130 is approximately 20 mm in its raw state, so that a finished insulating packaging 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, outside temperature, the temperature of the intended transport container or loading space, the intended transported goods, and the planned transport duration. If particularly stringent requirements are placed on the stability of the insulating packaging and / or its insulating properties, it can, if necessary, also have two or more outer layers, between which additional inner layers of insulating material can be provided if necessary.

[0043] The method according to the invention can be carried out manually with several workstations connected in series. In this case, it is useful 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 of the main flow direction and pushed onto the outer layer 110.

[0044] An inventive insulating packaging 100 is not only suitable for shipping chilled or heated food or other goods, such as chilled pharmaceuticals or medical supplies, but also for shipping sensitive, sharp-edged or fragile goods, for which envelopes with a plastic bubble lining have previously been used. LIST OF REFERENCE SYMBOLS 100 insulated packaging 101 side margins (out of 100) 102 side margins (out of 100) 103 shoulders (out of 100) 104 side stripes (out of 100) 110 outer layer 111 first part (of the outer layer 110) 111A first part (of the outer layer 110) 111B second part (of the outer layer 110) 112 second part (of the outer layer 110) 113 Overlap part (to 111) 114 (first) fold line (at 113) 115 (second) fold line (between 111 and 112) 116 material-locking embossing (cross knurling) 117 material-locking embossing (cross knurling) 118 Spray area 119 Fluid layer 122 closure tab (on 112) 123 fold line (at 122) 125 (third) fold line (in the middle of 130) 130 inner layer 140 recording room 151 material-locking embossing (longitudinal knurling) 152 material-locking embossing (longitudinal knurling) L Longitudinal axis (of 100) QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CH 540828 A

[0002] DE 10 2015 223 333 B4

[0041]

Claims

[1] Insulating packaging (100) with at least one outer layer (110) of paper and at least one inner layer (130) of heat-insulating material, characterized by that the outer layer (110) has at least two parts (111, 112; 111A, 111B) which at least largely surround the inner layer (130), wherein the inner layer (130) is formed from a shredded, in particular fiberized, paper or cardboard material or a tissue material, and the at least two parts (111, 112; 111A, 111B) of the outer layer (110) are connected by means of at least one material-locking embossing (116, 117, 151, 152). [2] Insulated packaging (100) according to claim 1, characterized by that the material-locking embossing (116, 117, 151, 152) is designed as knurling. [3] Insulating packaging (100) according to claim 1 or 2, characterized bythat the inner layer (130) can be or is connected at least partially to the outer layer (110) by means of a fluid which in particular comprises water and / or a dispersion adhesive. [4] Insulating packaging (100) according to at least one of the preceding claims, characterized by in 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) partially or completely on the side facing away from the first part (111; 111A). [5] Insulating packaging (100) according to at least one of claims 1 to 3, characterized bythat 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 which enclose the inner layer (130) between them. [6] 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 in regions, and is covered by the second part (112), in particular completely. [7] Insulating packaging (100) according to one of claims 4 to 6, characterized bythat the first part (111; 111A) of the outer layer (110) and at least the second part (112; 111B) of the outer layer (110) with the inner layer (130) lying between them are folded along a third fold line (125) to form a pocket-shaped receiving space (140), 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). [8] Insulating packaging (100) according to one of the preceding claims, characterized by that at least one of the material-locking embossments (151, 152) connects the first part (111; 111A) and the second part (112; 111B) of the outer layer (110) close to a lateral edge (101, 102) of the insulating packaging (100), but outside the inner layer (130) running parallel to the direction of a longitudinal axis (L) of the insulating packaging (100). [9] Insulating packaging (100) according to one of the preceding claims, characterized by that at least one material-locking embossment (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). [10] Insulating packaging (100) according to one of the preceding claims, characterized by that at least one side strip (103, 104) arranged near lateral edges (101, 102) of the insulating packaging (100) and having a material-locking embossing (151, 152) is folded over onto a back side of the insulating packaging (100) and is glued to it at least at certain points by means of an adhesive, in particular a dispersion adhesive. [11] Insulating packaging (100) according to one of the preceding claims, characterized by that the outer layer (110) is formed from a Clupak paper or a kraft paper. [12] Method for producing an insulating packaging (100), in particular according to one of the preceding claims, characterized by 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 at least to 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 portion of the first part (111) of the outer layer (110) provided with the fluid, - folding an overlapping part (113) arranged on the first part (111) of the outer layer at a first fold line (114) over at least 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 overlap 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-locking 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 dispersion adhesive diluted with water. [13] Method for producing an insulating packaging (100) according to claim 12, 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 overlap part (113) is carried out by folding the second part (112) of the outer layer (110) at a second fold line (115). [14] Method for producing an insulating packaging (100) according to claim 12, characterized bythat 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). [15] Method for producing an insulating packaging (100) according to claim 12, characterized by that instead of turning over an overlapping part (113), a material-locking embossing (117) running transversely to the longitudinal axis (L) is provided, by means of which the first part (111) is connected to the second part (112) of the outer layer (110) outside the inner layer (130). [16] Method for producing an insulating packaging (100) according to claims 12 to 15, characterized bythat the areas of the material-locking embossments (116, 117, 151, 152) are wetted with a liquid, in particular water and / or a water-soluble dispersion adhesive, before the embossments (116, 117, 151, 152) are introduced.

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