BE1022171B1 - THERMALLY INSULATING ELEMENT WITH HOLLOW WALL (S) BASED ON NATURAL MATERIAL OF ALVEOLAR STRUCTURE OR CORK FOR ISOTHERMAL PACKAGING - Google Patents

Abstract

The invention relates to an isothermal packaging based on at least one natural isothermal material of honeycomb structure or cork (2) comprising at least one thermally insulating element with hollow wall (s) based on natural isothermal material of honeycomb structure. or cork (1), said element having a thickness of at least 15 mm and at most 600 mm and comprising at least a first sheet based on at least one natural isothermal material (10), a gas blade ( 11), a second sheet based on at least one isothermal natural material (12) and one or more securing means (13, 13 ') between said sheets based on at least one isothermal natural material, the (s) said means (13, 13 ') being located at the periphery of said sheets (10, 12) based on at least one isothermal natural material, said means comprising one or more modules based of at least one isothermal natural material (130), the said module (s) (130) being in the form of protuberances emanating from at least one sheet e based on at least one natural isothermal material (10,12) or being added (s) to said sheet (10,12), said (s) said securing means (13) also comprising first fixing means (131), at least one of the two sheets (10, 12) being based on at least one natural isothermal material of honeycomb or cork structure, the said first means (s) (S) fixing and said (s) module (s) of attachment, forming the attachment means or means, being combined or not, said thermally insulating element with hollow wall (s) comprising accumulators of positive or negative cold in or less a sheet of gauze (11).

Description

Thermally insulating element with hollow wall (s) based on natural material of honeycomb structure or cork for isothermal packaging 1. Field of the invention

FIELD OF THE INVENTION The field of the invention is that of thermally insulating elements with hollow walls (s) based on isothermal natural material of honeycomb structure or cork for isothermal packaging, their method of obtaining and their use.

More specifically, the invention relates to an isothermal package comprising at least one thermally insulating element with hollow wall (s) based on at least one isothermal natural material of alveolar structure or cork, said isothermal packaging being intended for any type thermally sensitive products (PST) in solid, liquid or gaseous form such as, for example, fresh or frozen foodstuffs, cosmetics, medicines, vaccines, living organisms, etc., requiring controlled temperature transport in a defined time space. 2. Solutions of the prior art

Isothermal or thermal insulation materials are materials characterized by a low thermal conductivity that can isolate, to a certain extent, the surrounding environment. They are used to reduce heat exchange between two different temperature environments and thus avoid the establishment of a thermal equilibrium between the two environments. When said materials are incorporated within a package, they allow a constant temperature to be maintained inside the package they constitute, independently of variations in outside temperature. In the building, according to the French standard RT2012, a material is considered as thermal insulation if its thermal conductivity is less than 0.065 W / m.K for a temperature of 20 ° C.

Said isothermal or thermal insulating materials are generally in the form of a solid matrix in which is imprisoned a dispersion of static gas pockets, this immobilization having the object of making impossible the thermal convection phenomena. The materials constituting the solid matrix are for example composite and / or synthetic materials, most of which are derived from petroleum refining such as polystyrene, polypropylene, polyurethane. The trapped gas is usually air.

Historically, thermal insulating materials, more particularly used in the field of insulated packaging, use composite and / or synthetic materials, most of which are derived from petroleum refining such as expanded polystyrene (EPS), expanded polypropylene ( EPP), extruded expanded polyethylene (EPE), polyurethane (PU) or extruded expanded polyethylene foam or polyurethane foam. The problem related to the use of such composite and / or synthetic materials lies in their low biodegradability, their low recyclability, their significant environmental impact (such as their deplorable carbon footprint or their contribution to the greenhouse effect) because they require processes used to obtain them releasing a very large quantity of carbon or the fact that the isothermal packages based on said composite and / or synthetic materials are not for the most part approved for food contact, see for some of these composite materials and / or synthetic their isothermal properties too low, their low resistance to fire and / or shock, their low mechanical strength or the fact that their combustion releases highly toxic gases.

The document US1527167 describes an isothermal package with natural materials, said package being composed of a first envelope of corrugated cardboard type and a second envelope itself cardboard in the form of a hollow panel partitioning system, said hollow panel partitioning obtained being optionally filled with natural fibrous materials such as cotton, bran, hair, kapok, sawdust, wadded fabrics (fuzz) or fine cork cutter which allow a thermal insulation of the 'packaging. The hollow panel partitioning is reproduced throughout the interior surface of said package to maintain below or above a temperature over a given space and time. Fresh perishable goods are placed inside this improved packaging and reinforced by the double envelope to ensure the preservation of their freshness by sufficient isothermal during their transport to the final recipient.

However, the transport of fresh perishable goods usually requires the use of positive or negative cold accumulators. By the term "positive cold" is meant a temperature between 0 ° C and 10 ° C, preferably between 0 ° C and 8 ° C. By the term "negative cold" is meant a temperature of 0 ° C or less. The package as described in document US 1527167 can not be in line with the regulation of direct food contact because of the composition of its basic structure made essentially of cardboard, material remaining constantly in contact with perishable goods even if those These are pre-packed and carefully packaged using an approved overpack in contact with food. In addition, the package as described in US 1527167 can in no case be used with positive or negative cold accumulators such as blocks of water ice or ice cubes of water, eutectic gels, dry ice,. ... The natural material used is cardboard which is inherently sensitive to humidity and therefore to the appearance of drops of water caused by the heating or thawing of ice packs in the form of eutectic gel, ice cubes. water, ice block of water or dry ice. Under the effect of the appearance of water flakes, the materials used may be damaged, deteriorated, moistened or soaked, which may lead to: • a risk of development of harmful bacteria and contamination of the fresh products transported causing problems of water hygiene and public health, • a decrease in the mechanical rigidity during its transport, • a contamination of other packages by phenomenon of oozing during the transport by the interception and the friction of these packings.

In addition, said packaging of natural materials is by its structure difficult to reuse or recyclable but also has a low mechanical strength resulting in a limitation in the load weight, volume and nature of perishable materials transported.

In addition, the method used and described in the invention patent No. US 1527167 to give some insulation to the package promotes thermal bridge leaks further weakening the insulation performance of the package.

The document FRI 318983 describes a thermally insulating element comprising a first sheet of expanded polystyrene to which a second cork sheet is glued directly with the aid of a plastic glue, the said element being free of an air gap between the two. leaves. In addition, the document FRI 3118983 also describes the use of such an element within an isothermal package. Such an element and the packaging comprising it have because of the use of polystyrene an inability to achieve a hollow wall due to the low impact resistance of said polystyrene, a deplorable environmental impact and low biodegradability. 3. OBJECTIVES OF THE INVENTION The object of the invention is notably to overcome these disadvantages of the prior art.

More specifically, an object of the invention, in at least one of its embodiments, is to provide a thermally insulating element with hollow wall (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging, which has an exemplary environmental impact, which can be used in the context of direct food contact, which is rot-proof against gases and liquids, which is sterilizable, which is chemically neutral, which is biodegradable, recyclable and reusable and which has improved thermal insulation properties.

Another object of the invention, in at least one of its embodiments, is to implement a method for obtaining said heat insulating element with hollow wall (s) based on at least one natural material. isothermal structure honeycomb or cork for isothermal packaging. The invention, in at least one of its embodiments, is further intended to provide an isothermal package whose base material constituting it is recyclable, reusable and biodegradable, said isothermal packaging: • having a low environmental impact and properties improved thermal insulation, • being dismountable and remountable at will, storable flat to save space in its storage and transport supply, • being biodegradable, recyclable and / or reusable, • requiring the use of less large quantity of cold accumulator (eutectic gels or dry ice for example). 4. Presentation of the invention

According to a particular embodiment, the invention relates to a thermally insulating element with hollow wall (s) based on isothermal natural material of honeycomb structure or cork for isothermal packaging, said element having a thickness of at least 15 mm and not more than 600 mm.

According to the invention, such a thermally insulating hollow wall element (s) comprises at least a first sheet based on at least one isothermal natural material, a gas strip, a second sheet based on at least one an isothermal natural material and one or more securing means between said sheets based on at least one isothermal natural material, said medium (s) being located (s) on the periphery of said sheets based on at least one isothermal natural material and comprising one or more modules based on at least one isothermal natural material, preferably based on at least one natural isothermal material of alveolar or cork structure, the said modulus (s) in the form of protrusion (s) emanating from at least one sheet based on at least one isothermal natural material, preferably at least one sheet based on at least one isothermal natural material of alveolar or cork structure, or being added to said sheet, the said securing means (s) also comprising first fastening means, at least one of the two sheets being based on at least one isothermal natural material with honeycomb or cork structure, preferentially the first and second sheets are based on at least one isothermal natural material of honeycomb structure or cork, the (s) said (s) first (s) means (s) fixing and (s) said (s) module (s) securing, forming the one or more securing means, being merged or not.

The general principle of the invention is based on the introduction of a blade of gas between two sheets, said sheets being based on at least one isothermal natural material of which at least one is based on at least one material isothermal natural honeycomb structure or cork, preferably the first and the second sheet are based on at least one isothermal natural material of honeycomb structure or cork.

Thus, the invention is based on a completely new and inventive approach, the inventors having determined that surprisingly the introduction of said blade confers on an isothermal package comprising said thermally insulating hollow wall element (s) a increase in the order of 15% of the thermal insulation properties; in addition, the use of sheets based on at least one isothermal natural material at least one of which is based on at least one isothermal natural material of alveolar or cork structure, preferably both sheets are based on less isothermal natural material of honeycomb structure or cork, provides a thermally insulating element with hollow wall (s) having a low environmental impact, said thermally insulating element being biodegradable, reusable, rotproof to gases and liquids sterilizable and chemically neutral. Moreover, the coupling of the air gap with the great flexibility of the isothermal natural material of alveolar or cork structure promotes the shock absorption and the flexibility of the thermally insulating element with hollow wall (s) according to the invention. The invention makes it possible to avoid the use of spacer type stiffening means within said element, with respect to an element of the same size based on synthetic material.

By the term "isothermal natural material" is meant an isothermal material derived from nature, which has received no or very few modifications of man. Said natural material is an organic material of plant origin (cotton, hemp, wood fibers or cellulose, sound, hemp, flax, cork, ...) or animal (hair, sheep wool, ... ).

By the term "isothermal natural material with honeycomb structure or cork" is meant an organic material of plant origin consisting of cell in the form of microalveoles, pentagonal or hexagonal, whose height does not exceed 40 to 50 micrometers, the smaller cells measuring only 20 or even 10 micrometers, said cells being filled with a mixture of gaseous 95% similar to the gases in the air. Preferably, the natural material with honeycomb structure is cork in expanded form (cork having been heated at high temperature and inflated with air), natural (raw cork having undergone no treatment, except scalding) or agglomerated (made cork from cork granules and / or cork dust to which a binder is added, said binder can be natural or synthetic, preferably a binder suitable for direct food contact and respecting health and public hygiene such as glue polyurethane food for example or any non-toxic natural resin such as suberin, for example. "By" gas blade "is meant the space or voids between the first and second sheets.

By the terms "based on isothermal natural material" or "based on isothermal natural material of alveolar structure or cork" is meant respectively to designate the fact that the thermally insulating element according to the invention consists of at least 50% in weight in at least one isothermal natural material or in at least one isothermal natural material of honeycomb or cork structure, preferably in at least 70% by weight in at least one natural material or in at least one isothermal natural material of alveolar structure or cork, more preferably at least 90% by weight in at least one isothermal natural material or in at least one isothermal natural material of alveolar or cork structure 2, most preferably at least 99% by weight in at least one isothermal natural material or at least less isothermal natural material of alveolar structure or cork.

By the terms "said means being located at the periphery of said sheets of isothermal natural material", it is meant that the securing means are located on or at a short distance from the edges of the sheets on the full-face side or on the edge of said sheets. By the terms "short distance" is meant a distance expressed as an absolute value with respect to the edges or the edge of said sheets of at least 0 mm, preferably at least 20 mm, more preferably at least 25 mm. mm, most preferably at least 30 mm. Said distance being a function of the final positioning of the thermally insulating hollow wall element (s) within the isothermal package, a distance of at least 15 mm in the horizontal part and at least 20 mm in the horizontal part. the vertical part with respect to the final positioning of the thermally insulating element within the isothermal package are preferred, a distance of at least 15 mm in the horizontal part and at least 25 mm in the vertical part with respect to the final positioning of the thermally insulating element within the isothermal packaging are more preferred, a distance of at least 20 mm in the horizontal part and at least 30 mm in the vertical part relative to the final positioning of the thermally insulating element within the insulated package are preferred. -

By the term "sheet" is meant a flat or curved plate, the first and second sheet preferably having dimensions (length, width, radius of curvature) identical.

By the terms "first fastening means" is meant mechanical type fastening means such as rabbet, mortise, tenon, blind hole and ankle and / or chemical such as glues, mastics and adhesives. Preferentially, it is meant to designate chemical fixing means such as food glues.

By the terms "said (s) first (s) fixing means (s) and said (s) securing module (s), forming the means or securing, being merged", it is meant that each fastening means is single-piece, the said first fastening means and the said fastening module (s) are merged so as to constitute one or more pieces (one or more securing means) in one piece, that is to say they consist of the same material. As is the case for example of a thermally insulating element obtained by molding a first sheet, one or more securing means and the second sheet.

According to a particular embodiment of the preceding embodiment, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of alveolar or cork structure is such that the first sheet based on minus an isothermal natural material at a thickness of at least 5 mm and at most 200 mm, preferably at a thickness of at least 6 mm and at most 200 mm, more preferably at a thickness of at least 8 mm and not more than 200 mm, most preferably not less than 10 mm and not more than 200 mm, the gas strip to a thickness of not less than 5 mm and not more than 200 mm, preferably at a thickness of at least 6 mm and at most 200 mm, more preferably at a thickness of at least 8 mm and at most 200 mm, most preferably at a thickness of at least 10 mm and not more than 200 mm, the second sheet based on at least one natural isoth material at a thickness of at least 5 mm and at most 200 mm, preferably at a thickness of at least 6 mm and at most 200 mm, more preferably at a thickness of at least 8 mm and at least at most 200 mm, most preferably at a thickness of at least 10 mm and at most 200 mm.

According to a particular embodiment, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging is such that the (s) said (s) modulus (s) is (are) in the form of protrusion (s) emanating from two sheets based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar structure or cork, or being added to said sheets, said one or more securing means also comprising first fastening means, at least one of the two sheets being based on at least one isothermal natural material with honeycomb or cork structure.

According to a particular embodiment, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging is such that the securing means located at the periphery said sheets of natural material are arranged in such a way that, in conjunction with the first and second sheets, they completely trap the air knife.

Advantageously, the thermally insulating element with hollow wall (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging is such that it comprises following the second foil based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar or cork structure, an additional structure comprising at least one gas strip and a sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar structure or cork, said structure being reproduced n times, with n an integer greater than or equal to 1, preferably n is less than or equal to 3, more preferably n is less or equal to 2, most preferably n is 1. The repetition of the sheet / gas blade / sheet structure leading to an improvement of the properties thermal insulation.

According to a preferred embodiment or according to the invention, the insulating thermal element with hollow wall (s) is such that the first and the second sheet are secured in such a way that one is offset with respect to the other in the vertical and / or horizontal direction, so as to create a free edge, said free edge acting as first assembly means to form the isothermal package. The term "shifted" is meant to mean that one of the sheets has undergone with respect to the other sheet which faces a horizontal displacement and / or vertical in the plane of said sheets.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on isothermal natural material is cork in expanded form (cork having been heated at high temperature and inflated with air), natural (raw cork having undergone * no treatment, except scalding) or agglomerated (cork made from granules and / or cork dust to which a binder is added, said binder being natural or synthetic preferably a binder suitable for direct food contact and respecting health and public hygiene such as a polyurethane food glue for example or any non-toxic natural resin such as suberin for example .The advantage of a thermally insulating element is based on cork is that said element is biodegradable, rotproof to liquids and gases, has a long service life, is chemically neutral and has a high high flexibility and dimensional stability.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging is such that the blade gas comprises at least one gas selected from nitrogen, oxygen, carbon dioxide, argon, krypton and mixtures thereof. This type of gas makes it possible to obtain improved thermal insulation properties.

According to an alternative embodiment, the gas blade consists essentially of air.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging is such that s) securing means (s) comprising one or more modules based on at least one isothermal natural material, the said module (s) being in the form of excrescences emanating from at least one sheet based on at least one isothermal natural material. Preferably, the one or more modules are based on cork in expanded form (cork having been heated at high temperature and inflated with air), natural (raw cork having undergone no treatment, except scalding) or agglomerated (made cork from granules and / or cork dust to which a binder is added, said binder can be natural or synthetic, preferably a binder suitable for direct food contact and respecting health and public hygiene such as a polyurethane food glue for example, or any non-toxic natural resin such as suberin, for example, the advantage of the means (s) for joining together comprising modules based on at least one isothermal natural material, more preferably based on at least one isothermal natural material with cellular or cork structure, is that it (s) allows (tent) to have a thermally insulating element with a low impact env irrational, said thermally insulating element being biodegradable.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of alveolar structure or cork is such that at least a part or the whole of at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of honeycomb or cork structure, is covered with at least one thermal insulating material. Said thermal insulating material is selected from paraffin, aerogels such as silica aerogels, preparations based on cork dust such as so-called clogging preparations. The advantage associated with the use of at least one thermal insulating material deposited on at least a part or all of at least one sheet based on at least one isothermal natural material, preferably at least one sheet based on at least one isothermal natural material with cellular or cork structure, is that it makes it possible to improve the insulating properties thereof but also to confer additional properties such as an improvement of the water-repellent, anti-fire or antibacterial properties element. In addition, the simultaneous use of a gas strip comprising krypton or argon coupled with a thermal insulating material deposited on at least a part or all of at least one sheet based on at least one material isothermal material, preferably at least one sheet based on at least one isothermal natural material with cellular or cork structure, makes it possible to obtain an isothermal package comprising said thermally insulating hollow-walled element (s) having a 30% increase in thermal insulation properties.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of alveolar structure or cork, is such that it comprises a or stiffening means, the said medium (s) being located (s) in the gas strip or said means comprising one or more stiffening units based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar or cork structure, said unit (s) being in the form of excrescences emanating from at least one sheet based on at least a natural material isothermal or being added (s) to said sheet, preferably two sheets, the (s) said stiffening means (s) also comprising second attachment means, said (s) second (s) means (s) for securing and said stiffening unit (s), forming the means (s) stiffening, being confused or not.

By the terms "said stiffening means (s) also comprising second fixing means, said second attachment means (s) and said unit (s) of stiffening, forming the stiffening means or means, being merged or not ", is meant to designate the fact that each stiffening means is single-piece, said (s) second (s) means (s) fixation and said joining unit (s) are fused so as to constitute one or more pieces (one or more stiffening means) in one piece, that is to say that they consist of the same material. As is the case for example of a thermally insulating element obtained by molding a first sheet, one or more securing means, the stiffening means or means and the second sheet.

By the terms "second fixing means" means fixing means of mechanical type such as rabbet, mortise, tenon, blind hole and ankle and / or chemical such as glues, mastics and adhesives. Preferentially, it is meant to designate chemical fixing means such as food glues. The advantage associated with said means (s) stiffening is that they allow, by their presence, to give the insulating element constant strength and rigidity regardless of the size of said element. It should be noted that the presence or absence of said stiffening means is related to the importance of the size of said thermally insulating element but also the importance of the hollow wall (s).

Preferably, the stiffening units are based on at least one isothermal natural material with honeycomb or cork structure, more preferably on the basis of cork in expanded form (cork having been heated at high temperature and inflated with air), natural (cork crude having no treatment, except scalding) or agglomerated (cork made from granules and / or cork dust to which a binder is added, said binder may be natural or synthetic, preferably a binder suitable for contact direct food and respecting health and public hygiene such as a polyurethane food glue for example or any non-toxic natural resin such as suberin for example.The stiffening units can take many forms such as parallelepiped or cylindrical.Preferentially, the stiffening units are in the shape of a rectangular parallelepiped gulaire, a stiffening means comprising such a unit forming for example a spacer.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging, is such that it comprises, on at least one slice, preferably on all of its slices, a first mechanical type assembly means in the form of at least one rabbet and / or at least one mortise and / or at least one a blind hole and / or at least one tenon. The presence of this first assembly means is to allow the self assembly of a plurality of thermally insulating elements with hollow wall (s) but also to avoid the presence of any "temperature leaks" or thermal bridges.

According to a preferred embodiment or according to the invention, the first mechanical type assembly means comprises at least one securing means.

According to a preferred embodiment or according to the invention, the thermally insulating hollow wall element (s) based on at least one isothermal natural material of alveolar structure or cork, is such that the first sheet to base of at least one isothermal natural material, the second sheet based on at least one isothermal natural material, the securing means (s) comprising one or more modules based on at least one isothermal natural material and the stiffening means (s) comprising one or more stiffening units are based on at least one isothermal natural material of honeycomb or cork structure, preferably based on cork in expanded form (cork having been heated to a high temperature). and inflated with air), natural (raw cork not having undergone any treatment, except scalding) or agglomerated (cork made from granules and / or cork dust to which we add a lian t, said binder may be natural or synthetic, preferably a binder suitable for direct food contact and respecting health and public hygiene such as a polyurethane food glue for example or any non-toxic natural resin such as suberin for example.

The embodiments of the thermally insulating element are not limited to the modes described above but may also result from a combination of two or more of them.

The method of manufacturing the hollow-wall thermally insulating element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging according to the invention is a method according to which the first sheet to base of at least one isothermal natural material, preferably based on at least one isothermal natural material of honeycomb structure or cork, comprising or not one or stiffening means, is secured to the second sheet based on at least an isothermal natural material, preferably based on at least one isothermal natural material of alveolar structure or cork, by one or more securing means, said second sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of honeycomb or cork structure, comprising or not stiffening means.

According to a preferred embodiment, the method of manufacturing the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging according to the invention is such that at least one of the fastening modules, preferably all of the modules, based on at least one isothermal natural material, preferably based on at least one isothermal natural material of honeycomb structure or cork, forming in all or part of the securing means or means, said (s) module (s) being in the form of excrescences, is (are) obtained by digging or recessing at least one sheet-based at least one isothermal natural material, preferably based on at least one isothermal natural material of honeycomb or cork structure, by compression of at least one sheet based on at least one isothermal natural material, preferentially based on at least one isothermal natural material of alveolar or cork structure, by extrusion of at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar structure or cork, or by molding a structure consisting of at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar or cork structure, and said modules or are added to said sheet by gluing. Preferably, said one or more modules are in the form of excrescences, is (are) obtained by digging or recessing at least one sheet based on at least one isothermal natural material, preferably based on less an isothermal natural material of alveolar structure or cork.

According to a preferred embodiment, the method of manufacturing the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging according to the invention is such that the stiffening unit (s) constituting the stiffening means (s) based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar or cork structure, is or are obtained by digging or recessing at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of cellular or cork structure, by compression of at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar structure or cork, by extrusion of at least one sheet e based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar or cork structure, or by molding a structure consisting of at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of cellular or cork structure, and said stiffening units constituting the means (s) of stiffening or are added to said sheet by gluing. Preferably, the stiffening unit or units constituting the stiffening means (s) based on at least one isothermal natural material, preferably based on at least one isothermal natural material of alveolar or cork structure, is or are obtained by digging or hollowing at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal natural material of cellular or cork structure.

According to a preferred embodiment, the method of manufacturing the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging according to the invention is such that at least a portion of at least one sheet based on at least one isothermal natural material, preferably based on at least one isothermal material of honeycomb or cork structure, is covered with at least one material thermal insulation before joining. Said thermal insulating material is selected from paraffin, aerogels such as silica aerogels, preparations based on cork dust such as so-called clogging preparations. The thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork for isothermal packaging according to the invention has a wide field of use. The invention is particularly intended for the possible uses of the insulating thermal element for the production of an isothermal packaging for transport and handling conditions related to said transport (strength, size, ...). The invention therefore also relates to isothermal packages based on at least one isothermal natural material of cellular or cork structure comprising one or more heat-insulating elements with hollow wall (s) as described above.

According to a preferred embodiment, the isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is such that it comprises: a. a first thermally insulating element or base provided with a second mechanical and / or chemical type mechanical assembly means, preferably of the mechanical type, b. a second or a plurality of second heat-insulating hollow-walled elements based on at least one isothermal natural material of alveolar structure or cork as described above forming the side walls of the package, the plurality of said second elements being able to self-assemble, the second or second elements being provided or not with a first means of assembly of mechanical and / or chemical type, preferably of mechanical type, the second means of assembly of said first element or base allowing both to maintain vertical and / or horizontal the one or the plurality of second elements forming the side walls of the package, c. a third insulating element or cover provided with a third assembly means of mechanical and / or chemical type, preferably mechanical type.

The term "isothermal packaging" is intended to denote a package whose overall heat transfer coefficient K is less than or equal to 1.50 W / m2.K, preferentially less than or equal to 1.30 W / m2.K, plus preferably less than or equal to 0.80 W / m2.K, most preferably less than or equal to 0.40 W / m2.K.

To characterize the performance of an isothermal package, the overall heat transfer coefficient K is determined. The coefficient K represents the amount of heat transmitted through a unit area, per unit of time, and per degree of temperature difference. The said coefficient K is measured according to the AFF method (described in the link http: // arobase- com.fr/aff/image/fichierUpload/medicamentch2et3.pdf) and described hereinafter as well as in the AFNOR NF S99 700 standard. the measurement is reliable, the test device must not modify one of the thermal parameters of the materials and must not provide additional exchanges with respect to the normal use of the tested enclosure (container, packaging or vehicle).

The overall coefficient K is measured by a suitable test device, taking into account all the materials involved in the design of the device and assembly techniques. By maintaining a constant temperature difference between inside and outside (steady state), the overall coefficient of heat transfer is deduced from relation (1):

(1)

With q: representing the heat flux, expressed in W, is the amount of heat exchanged (between the inside and outside) per unit of time, said flow is equal to. the thermal power expended (generally by electrical resistances) S: representing the heat exchange area in m2. S is the geometric mean of the inner surface Sj and outer surface Se of the isothermal package and is given by relation (2):

(2) ΔΤ: representing the temperature difference between outside and inside in Kelvin. The temperature of each medium is the average of the temperatures of this medium.

The quantity of heat, expressed in Joules (J), exchanged during a period t is given by relation (3):

(3) - Where t is expressed in seconds

If the enclosure (container or packaging) is not perfectly tight or if it undergoes openings during the period of use, the amount of heat exchanged by the air infiltrations (transfer of heat by transfer of material) will be added to the quantity exchanged through the walls.

The steady-state indoor heating method (heat loss per unit area) consists of placing the insulating volume in a test cell. The temperature of the test cell is maintained at + 5 ° C and the internal temperature of the insulating box is kept constant at + 35 ° C, with ventilated electrical resistances.

The determination of the two surfaces Si and Se is done taking into account the singularities of the structure of the box or irregularities of the surface, such as rounded off, recesses for passage of the wheels, etc. If for example, the body has a corrugated sheet type coating, the surface to be considered is the right surface of this coating and not the developed surface. The overall heat transfer coefficient K is thus calculated using the average values of temperature and thermal power during the last six hours of the steady state.

Advantageously, the first insulating element or base and / or the third insulating element or cover are based on at least one isothermal natural material, preferably based on at least one isothermal natural material with honeycomb or cork structure, more preferably based on cork in expanded form (cork having been heated at high temperature and inflated with air), natural (raw cork not having undergone any treatment, except scalding) or agglomerated (cork made from granules and / or dust cork to which a binder is added, said binder can be natural or synthetic, preferably a binder suitable for direct food contact and respecting health and public hygiene such as a polyurethane food glue for example or any natural resin non-toxic such suberin for example, more preferably the first insulating or base element and / or the third element solant or cover are thermally insulating elements with hollow wall (s) based on at least one isothermal natural material of alveolar structure or cork as described above.

According to a preferred embodiment of the preceding embodiment, the isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is such that the second mechanical type of assembly means and the first means of mechanical type assembly, and / or the third mechanical type assembly means and the first mechanical type assembly means fit into each other in such a way that their interlocking does not reveal any edge law. By the term "right edge" is meant the fact that the line of separation between said means is a broken line. Such an engagement method advantageously makes it possible to reduce the formation of thermal bridges.

Thus the third thermally insulating element or cover makes it possible to hold together the plurality of said second heat-insulating hollow-walled elements based on at least one isothermal natural material of alveolar or cork structure, as previously described, between they, so that the junction of the third assembly means, in the form of a rim for example, said cover with the first means of assembly, in the form of protrusion, said second elements promotes the absence of thermal bridges within the packaging.

According to an advantageous alternative, positive or negative cold accumulators such as water ice blocks or water ice cubes, eutectic gels, dry ice, etc. are placed in at least one gas blade of at least one of thermally insulating elements with hollow wall (s) based on at least one isothermal natural material of alveolar structure or cork as described above.

According to a preferred embodiment, the isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is such that the first, the second and / or the third mechanical type assembly means is selected from the rabbet, mortise, tenon, blind hole and ankle assembly means, preferably rebate type.

According to another preferred embodiment, the isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is such that the first, the second and / or the third assembly means of type Chemical is selected from the group of adhesives, sealants and adhesives.

According to a preferred embodiment, the isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is such that the ends or upper and / or lower edges of the second or second thermally insulating elements to hollow wall (s) based on at least one isothermal natural material of alveolar or cork structure forming the side walls of said isothermal packaging based on at least one isothermal natural material of alveolar structure or cork are located in the same plan.

According to a preferred embodiment, the packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is such that the first insulating element or base and / or the third insulating element or cover, preferably the first insulating element or base and the third insulating element or cover, is / are provided with a rim forming a part of the first and / or third mechanical type assembly means. Said flange may be of variable size and height which advantageously favors for the base or first insulating element to avoid seepage during the transport of material secreting a liquid and thus avoiding any propagation of said liquid. The isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork according to the invention is able to be inserted into a corrugated cardboard that can go up to the pallet container of 1 to 2 m 3, in a bag backpack or in a tote bag or any other natural envelope or not and having the function of maintaining said first, second and third elements together. Isothermal packaging based on at least one isothermal natural material honeycomb structure or cork according to the invention is intended for all types of heat-sensitive products (PST) (fresh or frozen food products, cosmetics, drugs, vaccines , living ...) requiring transport under controlled temperature in a defined space-time and meeting the needs of temperature phases ranging from -200 ° C. to + 130 ° C., the performance of the packaging according to the invention being can cover these needs. 5. List of Figures Other features and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment, given as a simple illustrative and nonlimiting example, and the accompanying drawings, drawings not being to scale, among which: • Figure 1 shows a thermally insulating element based on at least one isothermal natural material honeycomb structure or cork (1) according to the invention, so "exploded" (the various constituents being not joined), said thermally insulating element (1) comprising at least a first sheet based on at least one isothermal natural material (10), a gas strip (11), a second sheet based on at least one isothermal natural material (12) and securing means between said sheets of isothermal natural material (13, 13 '), said means being located at the periphery of said based on at least one isothermal natural material, and comprising modules (130, 130 ') based on at least one isothermal natural material, added (s) to said sheet, said securing means (13, 13') ) also comprising first fastening means (131, 131 '), at least one of the two sheets being based on at least one isothermal natural material with honeycomb structure or cork. FIG. 2 illustrates various possible forms of modules (130) constituting the securing means (13). FIG. 3 describes, in an "exploded" manner (the various constituents being not joined), the possible positions of the securing means based on FIG. at least one isothermal natural material (13, 13 '), said means comprising first fastening means (131, 13Γ) and modules (130, 130') based on isothermal natural material of alveolar structure or cork in a thermally insulating element according to the invention (1), said element (1) comprising at least a first sheet based on at least one isothermal natural material (10), a gas strip (11), a second sheet based on at least one isothermal natural material (12). FIG. 4 shows, in an "exploded" manner (the various constituents being not joined), a thermally insulating element based on at least one isothermal natural material of alveolar or cork structure (1), at least one first sheet with a base at least one isothermal natural material (10), a gas strip (11), a second sheet based on at least one isothermal natural material (12) and securing means (13, 13 ') between said sheets in isothermal natural material (10, 12), said means (13, 13 ') being situated at the periphery of said sheets (10, 12) based on at least one isothermal natural material, and comprising modules (130, 130') ) based on at least one isothermal natural material and fixing means (131, 131 '), at least one of the two sheets (10, 11) being based on at least one isothermal natural material with honeycomb structure or cork , said element (1) being provided with stiffening means (1 5), comprising a unit of natural isothermal material (150) and a second attachment means (151). FIG. 5 shows, in an "exploded" manner (the various constituents being not joined), a thermally insulating element based on at least one isothermal natural material of alveolar or cork structure (1), at least one first sheet based on at least one isothermal natural material (10), a gas strip (11), a second sheet based on at least one isothermal natural material (12) and securing means (13, 13 ') between said sheets in isothermal natural material (10, 12), said means (13, 13 ') being situated at the periphery of said sheets (10, 12) based on at least one isothermal natural material, and comprising modules (130, 130') ) based on at least one isothermal natural material and fixing means (131, 13 Γ), at least one of the two sheets (10, 11) being based on at least one isothermal natural material with honeycomb structure or cork said element (1) being provided with stiffening means (15 ), comprising a unit of natural isothermal material (150) and a second securing means (151). FIG. 6 shows, in an "exploded" manner (the various constituents being not joined), a lateral part of a thermally insulating element based on at least one isothermal natural material of alveolar or cork structure (1), at least a first sheet based on at least one isothermal natural material (10), a gas strip (11), a second sheet based on at least one isothermal natural material (12) and securing means (13, 13). ') between said sheets of isothermal natural material (10, 12), said means (13, 13') being located at the periphery of said sheets (10, 12) based on at least one isothermal natural material, and comprising modules (130, 130 ') based on at least one isothermal natural material and fixing means (131, 13Γ), at least one of the two sheets (10, 11) being based on at least one isothermal natural material to alveolar structure or cork, said element (1) being provided with a medium stiffening (15), comprising a unit of natural isothermal material (150) and a second fixing means (151). FIG. 7 shows a horizontal cross-section of the isothermal package according to the invention (2) placed on a first insulating element or base, said package comprising a plurality of second heat-insulating elements with hollow wall (s) (21) based on at least one isothermal natural material of alveolar or cork structure forming the side walls of the isothermal package (2), the plurality of said second elements being able to self-assemble, the second element or elements with or without a first mechanical assembly means (210), the second assembly means (200) of said first element or base (20) allowing both to maintain vertical and / or vertical horizontal and a third insulating element or cover (30) provided with a third mechanical assembly means (300). FIG. 8 shows a vertical cross-section of the isothermal package according to the invention (2) placed on a first insulating element or base (20), said isothermal package (2) comprising a first insulating element or base (20) provided with a second mechanical (200) and / or chemical (201) type joining means, a second or a plurality of second heat-insulating hollow-walled (21) -based second heat-insulating members less an isothermal natural material of honeycomb structure or cork according to the invention forming the side walls of the isothermal package (2), the plurality of said second elements being able to self-assemble, the said second or second elements being provided or not a first mechanical assembly means (210) and / or chemical (211), the second assembly means (200) of said first element or base (20) allowing both to maintain vertical right and / or horizontally said second element forming the side walls of said package and a third insulating member or cover (30) provided with a third mechanical (300) and / or chemical (301) assembly means.

Of course, the invention is not limited to the embodiments mentioned above. In particular, the skilled person can provide any variant in the morphology of the modules of the securing means and the units of the stiffening means and in the positioning of the first and second sheets facing one another constituting the insulation element according to the invention. 6. Description of an embodiment of the invention

An example of a thermal insulating element according to the invention is presented hereinafter as well as an embodiment of said element. In addition, an example of isothermal packaging comprising said element and an embodiment of said packaging are also presented.

Design of an insulating element (1) according to the invention forming the wall of the short side of an isothermal packaging according to the invention (2).

First sheet (10):

This first sheet (10) of flat surface comprising an inner face, an outer face and constituting the short side of an isothermal packaging (2) according to the invention, in the present case of the example such that said sheet (10) is of dimensions: 350 mm long, 245 mm wide and 20 mm thick. * As the inner face of said sheet reveals after digging, recessing, molding or any other method for producing an outgrow forming a solidarization module (130) distributed on the periphery of this face of 10 mm thick and / or height, a width of 25 mm vertically and 20 mm horizontally located at a distance of 0 mm from the edge of said sheet revealing a "hollow zone" forming the gas blade ( 11) on the remaining total surface of the inner face of this sheet (10). This first sheet (11) is longer than the second sheet (12) in the present case of this example and given the desired geometric shape.

However, it is also possible to consider a second method in the production of said first sheet (10) of the same dimensions as mentioned above, but with a minimum thickness of the order of 15 mm, thus making it possible to produce an outgrowth (130) of thickness and / or minimum height reduced by half compared to what has been described above is 5 mm thick thus allowing the second sheet (12) of different dimensions than the first (10) but being made of the same a manner that promotes, optimizes and facilitates a quality assembly of the two sheets constituting the insulating element (1) and thus making it possible to avoid any risk of thermal bridges.

Finally, the dimensions, the thicknesses, the distances and the positioning respectively of the protrusions or joining modules (130) of said sheets are such that they facilitate the quality finishing of a digging, casting recess or any other method allowing the realization of an outgrowth or securing module (130) distributed on the periphery of this face.

Second sheet (12):

This second sheet (12) comprising an inner face, an outer face and constituting the short side, in the present case of the example of an insulating element to produce an isothermal package such as dimensions: 330 mm in length, 282 mm width and 10 mm thick. As the inner face of said sheet is positioned on the protrusion or module of securing the first sheet so that this assembly creates reveals on the one hand: - the first assembly means (210) in form rebound type growths on each side of each of the sheets respectively located horizontally and vertically. Each first assembly means (210) in the form of a rabbet-like projection of identical dimensions on either side vertically of the insulating element (1) created created thus after assembly of the internal faces of the two said sheets ( 10, 12) for producing the insulating element (1) having the function in the present case of the example of an isothermal package (2) to fulfill the role of the short side, is located; from outside the edge of said inner face of the insulating member (1) namely 10 mm wide from the edge of said inner face of the insulating member (1) and of a vertical length of 245 mm. - First assembly means (210) in the form of rebound type growths on each side of each of the sheets (10, 12) respectively located horizontally and vertically. Each first assembly means (210) in the form of a rabbet-like projection of identical dimensions on either side horizontally and from bottom to top of the insulating element (1) created created thus after assembly of the faces internals of said two sheets (10, 12) for producing the insulating element (1) having the function in the present case of the example of an isothermal package (2) to fulfill the role of the short side, is located; from outside the edge of said outer face of the insulating member (1) namely 20 mm wide from the edge of said inner face of the insulating member (1) and a horizontal length of 330 mm. on the other hand creates and lets appear:

The second sheet (12) protruding vertically in base and height of 20 mm on either side of said first sheet (10) so that the latter exceeds in turn but horizontally 10 mm from and other of the insulating element (1) so that this dimensional difference creates the rebate clearance (210) sufficient thus conferring on the insulating element (1) achieved to fit easily and without difficulty in the assembly with the other parts constituting the insulated packaging (2). Finally, whatever the method of manufacture and / or assembly used for producing the two sheets (10, 12) constituting the insulating element (1), the latter create in its heart a so-called hollow wall conferring a blade of air (11) trapped and hermetically closed using the securing means (130) made from the securing modules and fastening means (131) such as synthetic glue or natural resin respecting hygiene and public health .

However, it is also possible to consider a second method in producing said second sheet (12) of the same dimensions as mentioned above, but with a minimum thickness of the order of 15 mm, thus making it possible to produce a module of integral or outgrowth (130) of thickness and / or minimum height of 5 mm in thickness thus allowing the first sheet (10) of different dimensions than the second (12) but being made in the same way favoring, optimizing and facilitating a quality assembly of the two sheets (10, 12) constituting the insulating element and also making it possible to avoid any risk of thermal bridges. The assembly of the two sheets (10, 12) revealing the first assembly means (210) in the form of a rebate-like projection as described above both horizontally and vertically. on both sides of said element (1), filling in this case the example for an isothermal packaging (2) the function of the short side.

Finally, the dimensions, the thicknesses, the distances and the positioning of the securing modules (130) or protuberances respectively of the sheets (10, 12) are such that they facilitate the quality finishing of a digging, * d ' recessing, molding or any other method allowing the realization.

In addition, the possibility of providing within the hollow wall of the insulating element (1), the presence of stiffening units (150) in the form of excrescences located on the inner face of said first (10) and / or second sheet (12) by the digging technique, recessing, molding or any other method allowing the realization and promotes not only the advantage of providing sufficient stiffness that would require the insulating element (1) but also to be able to divide within it a plurality of hollow zones while conferring similar insulation performances since all of them can receive totally and / or partially an airgel projection (100, 120) favoring the advantage of a good resistance to compression, performing the insulation of the element by filling any surface roughness occurring during the production of said sheets (10, 12), not being harmful to public health e; it is the same for the mixture of cork dust with a natural binder; or else a paraffin spray improving the coefficient of friction on the one hand between the insulating elements in their assembly to form an isothermal package (2), to perform the element (1) by its insulating quality and by the filling of any surface roughness occurring during the production of said sheets (10, 12) performing all the element (1), to have the ability to respect the hygiene and public health in a general manner or any other substance thus promoting the improvement of the performance of the packaging (2) proper and that these same elements (1) can also be simultaneously, in their (s) zone (s) hollow (s) said blade gas (11) ), depending on the desired thermal insulation performance, filled partially or totally in addition to at least one gas such as argon, krypton etc .... or their mixture; further improving the expected thermal insulation performance. In addition, the sizes, the dimensions, the thicknesses, the flow rates, the number of hollow walls are variable according to the needs and. applications). The plurality of stiffening unit (150) in the form of protrusion of shapes and sizes and their positioning is possibly variable depending on the needs and desired performance.

However, it should be noted that the absence of stiffening unit (150) in the form of an excrescence makes it possible also to promote some compensation for the increase in the thickness of the fastening modules (130) in the form of protrusion located initially on the periphery of said sheet (10, 12) and the maximum number possible up to n times four, n denoting here the unit of initial thickness of the sheet (10, 12) concerned, this improvement has for advantage of allowing the insulating element (1) to increase its damping performance of possible shocks to reduce the total weight of the insulating element (1) thus produced due to less material need while giving it performance like.

Such an increase is not recommended for elements (1) said to be smaller because the effect would be reversed and the wall could crack or open and for a thickness as cited above. In addition, it is possible to remedy this by increasing the thickness of the securing modules (130) in the form of excrescences located initially at the periphery of said sheet (10, 12) and at the maximum possible number up to n times two, n denoting here the initial thickness of the sheet (10, 12) concerned, or for larger sheet thicknesses (10, 12) such as greater than or equal to the order of 50 mm minimum where the stress would arise more.

Design of an insulating element (1) according to the invention forming the wall of the long side of an isothermal package according to the invention (2). _. . .

First (10) and second sheet (12):

For the realization in the case of the present example of the realization of an insulating element (1) having as function within an isothermal packaging (2) to fulfill the role of "long side"; the method used is identical in all respects with that described above concerning the so-called "small side" with the only difference of dimensions so for the first sheet (10) we note 500 mm length, 240 mm width and for the second sheet (12) we note 460 mm in length, 280 mm in width. Thus conferring the respective qualities and performances between the small and the big side.

Design of the first thermally insulating element or base (20) and the third thermally insulating element or cover (30) of the insulated package (2).

These two parts (20, 30) are in fact basically only their own exact replica on the design of said sheet but in larger dimensions. The base (20) and the cover (30) are constituted respectively such that a flat surface sheet comprising an inner face, an outer face and dimensions in the present case of the example such that: 500 mm in length, 390 mm width and 40 mm thickness, reveals after digging, recessing, molding or any other method allowing the realization on the inner face of said sheet of a second assembly means (200) or a third assembly means (300) in the form of a protrusion distributed on the periphery of said face 20 mm thick and / or height, a width of 20 mm located at a distance of 0 mm from the edge of the said sheet revealing a "hollow zone" on the remaining total surface respectively of the base (20) and the cover (30).

The base (20) on the one hand, serving as a structural support for assembly and assembly maintaining in vertical position the assembly of the insulating elements (1) such as the small and large sides of the isothermal packaging. And secondly allowing by design to support a maximum load as defined in the collective agreement governing the transport of packages and / or handling is 30Kg maximum.

The cover (30) providing with the aid of the third assembly means (300) in the form of protuberances located at its periphery on its inner face to fit like a jaw all around and uniformly of said first assembly means ( 210) in the form of grooves on the upper part of each of the internal faces of the insulating elements (1) constituting the package (2) while at the same time allowing the cover (300) to rest simultaneously on the upper width of each outer faces of the insulating elements (1) constituting the package (2). By this design, the lid (300) of said isothermal package (2) gives the latter a uniform and almost hermetic closure thus maintaining a sufficient assembly pressure of the insulating elements (1) between them to promote the absence of thermal bridges at within the isothermal packaging.

Finally, the dimensions, the thicknesses, the distances and the positioning respectively of said first (200), second (210) and third (300) assembly means, said joining modules (130) and / or said stiffening units (150). ), in the form of excrescences are such that they facilitate the quality finishing of a digging, recessing, molding or any other method for achieving.

Assembly phase of the insulated packaging (2) within an outer envelope such as corrugated cardboard:

Each part (1, 20, 30) constituting the isothermal package (2) can be mounted or dismounted and repositioned as desired.

Each part (1, 20, 30) is positioned within an outer casing such as a corrugated cardboard larger in size of 1 to 2mm than said isothermal package so that the mounting of the insulating elements (1) comprising the Isothermal packaging (2) can be done easily and without any difficulty. Corrugated cardboard has the sole function, a possible role of maintaining the isothermal packaging (2). When mounting the cardboard taped to its base and the insulated packaging (2) assembled and then tightly closed, fold over the insulated packaging (2) and tape together the upper parts of the corrugated cardboard that is now ready to be shipped.

The general design of the present invention makes it possible to maintain the optimization of the performance of the isothermal packaging (2) while using on the one hand less raw material such as cork, but also on the other hand to favor a use less eutectic gels in contrast to composite packaging such as polystyrene existing on the market, at least about 35% less.

In the present case of the example, the isothermal packaging (2) of rectangular shape consists of several insulating elements such as a structural base (20), two long sides followed by two small sides consisting of thermal insulating elements (1) and finally its lid (30) for its closure.

This assembly is done as follows:

First stage :

After having correctly taped the bottom of the carton, the first insulating element or base (20) of the insulated package (2) is inserted into said corrugated cardboard envelope, so that the planar surface of this first insulating element or base (20) ) lies flat at the bottom.

Second step :

Once positioned flat and at the bottom of said carton the base, the large side of the isothermal package (1) will be positioned vertically so that the first assembly means (210) in the form of lower protrusion of the thermally insulating element (1) constituting the long side fully rests on the second assembly means (200) in the form of protrusion respectively in length of the base (20). The outer face of the thermally insulating element (1) constituting the long side will be against the inner face of the long side of the envelope of the corrugated cardboard, leaving the visual of the inner face of the insulating member (1) appear. Repeat this step again by symmetrically placing the insulating element (1) constituting the second long side with respect to the first.

Third step :

When positioned vertically along the length of the first connecting means (210) in the form of a lower protrusion of the insulating element (1) constituting the long side and fully resting on the second connecting means ( 200) respectively in the form of protrusion of the base (20), ensuring that the first assembly means (210) of "rebate" type located on the lower part of the inner face of the insulating element (1). ) constituting the large side fits perfectly at right angles from the lower part of the second assembly means (200) in the form of an excrescence and over the entire length of the first thermally insulating element or base (200) of the isothermal packaging (2).

Fourth step:

Once positioned vertically, the two insulating elements (1) having the function of forming the long sides of the insulated package (2), inserting the insulating element (1) having the function in the isothermal package (2) the small side. Taking care to put the outer face of said insulating member (1) facing the inner portion of the short side of the corrugated cardboard envelope by inserting this insulating member by sliding it between the two thermally insulating elements (1) forming the long sides and already arranged. Repeat in the same way this assembly using a second insulating element (1) whose function is to form a small side. Providing an insulated packaging (2) mounted which it will only remain to close with the third insulating element or cover (300) of the isothermal package (2).

Fifth step:

Once positioned vertically the four second insulating elements (1) on the first 2 insulating elements or base (20) it remains only to take the third insulating element or cover (30) of the insulated packaging (2) taking care to position the inner face of said protruding element and to position this third thermally insulating element or lid by taking the first assembly means (210) in the form of upper rabbets of all the insulating elements (1). ) and allowing after a slight pressure to insert it properly abutment so that on the one hand the third assembly means (300) in the form of protrusion of the third thermally insulating element or cover (30) fits perfectly flat on the entire periphery formed and located on the upper part of the outer face of the first assembly means (210) in the form of an excrescence of each of the insulating elements (1) thus making it possible to ensure an almost hermetic closing quality of the isothermal packaging (2) and to maintain a sufficient pressure in order to firmly hold the insulating elements (1, 20, 30) together, and thus promoting the absence of thermal bridges.

Finally, it remains more than fold the upper parts of the cardboard on the flat outer face of the cap of the insulated packaging (2) thus using Scotch tape the complete closure of the isothermal package (2).

Claims (19)

1. Isothermal packaging based on at least one isothermal natural material of cellular or cork structure (2) comprising at least one thermally insulating element with hollow wall (s) based on isothermal natural material of alveolar structure or cork ( 1), said element having a thickness of at least 15 mm and at most 600 mm and comprising at least a first sheet based on at least one isothermal natural material (10), a gas strip (11), a second sheet based on at least one isothermal natural material (12) and one or more securing means (13, 13 ') between said sheets based on at least one isothermal natural material, said (s) ) means (13, 13 ') being located on the periphery of said sheets (10, 12) based on at least one isothermal natural material, said means (s) comprising one or more modules based on minus an isothermal natural material (130), said module (s) (130) being in the form of excrescences emanating from at least one sheet based on at least one isothermal natural material (10, 12) or being added to said sheet (10, 12), the said medium (s) of fastening (13, 13 ') also comprising first fixing means (131), at least one of the two sheets (10, 12) being based on at least one isothermal natural material of alveolar structure or cork, the (s) said first fastening means (s) and the said fastening module (s), forming the fastening means (s), being merged or not, said thermally insulating wall element ( s) hollow (s) comprising positive or negative cold accumulators in at least one gas blade (11). 2. Isothermal packaging according to claim 1, such that the thermally insulating hollow wall element (s) based on isothermal natural material of honeycomb structure or cork (1) comprises following the second sheet-based at least one isothermal natural material (12), an additional structure (14) comprising at least one gas strip (141) and a sheet based on at least one isothermal natural material (142), said structure being reproduced n times , where n is an integer greater than or equal to 1. 3. Isothermal packaging according to any one of the preceding claims, such that the sheets (10, 12) constituting the thermally insulating element with hollow wall (s) based on isothermal natural material of alveolar structure or cork (1) are cork-based in expanded, natural or agglomerated form 4. Isothermal packaging according to any one of the preceding claims, such that the gas strip (11) comprises at least one gas selected from nitrogen, oxygen, carbon dioxide, argon, krypton and mixtures thereof. 5. Isothermal packaging according to any one of the preceding claims, such as one or more modules based on at least one isothermal natural material (130), are in the form of excrescences emanating from at least one sheet based on at least one isothermal natural material (10, 12). 6. Isothermal packaging according to any one of the preceding claims, such that at least a part or all of the at least one sheet based on at least one isothermal natural material (10, 12) is covered with at least one material thermal insulation (100, 120). 7. Isothermal packaging according to any one of the preceding claims, such that the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork comprises one or more stiffening means (15). ), the means (s) being located in the gas strip (11), the one or more means comprising one or more imitates of isothermal natural material (150), the said unit (s) ( 150) in the form of excrescences emanating from the at least one sheet based on at least one isothermal natural material (10, 12) or being added to said sheet (10, 12), said stiffening means (15) also comprising second fastening means (151), the said second fastening means (151) and the said stiffening unit (s). (150) forming the stiffening means (s) (15), being merged or not. 8. Isothermal packaging according to any one of the preceding claims, such that the thermally insulating hollow wall element (s) based on at least one isothermal natural material of honeycomb structure or cork (1) comprises, on at least one slice (16), a first mechanical type assembly means (161) in the form of at least one rabbet and / or at least one mortise and / or at least one blind hole and / or from less a tenon. 9. Isothermal packaging based on at least one isothermal natural material of honeycomb structure or cork (2) according to claim 1, as it comprises: a. a first thermally insulating or base element (20) provided with a second mechanical and / or chemical type joining means (200), b. a second or a plurality of second thermally insulating hollow-walled elements based on at least one isothermal natural material of honeycomb or cork structure (21) forming the side walls of the package (2); plurality of said second heat-insulating hollow-walled members (s) based on isothermal natural material of honeycomb or cork structure (21) being able to self-assemble, said second or second thermally insulating elements (21). ) with or without a first mechanical and / or chemical type assembly means (210), the second assembly means (200) of said first element or base (20) making it possible both to maintain the right to vertically and / or horizontally said second thermally insulating element (s) forming the side walls of said package (2), c. a third thermally insulating element or cover (30) provided with a third mechanical and / or chemical type assembly means (300). 10. Isothermal packaging according to claim 9, such that the mechanical type of assembly means (100, 200, 300) are selected from the inking means rabbet type, mortise, tenon, blind hole and dowel. The isothermal package of claim 9, wherein the chemical type joining means (100, 200, 300) is selected from the group of adhesives, sealants and adhesives. 12. Isothermal packaging according to any one of claims 9 to 11, such as the ends or upper and / or lower edges of the second or second heat-insulating elements hollow wall (s) based on isothermal natural material of honeycomb structure or cork forming the side walls of said package are located in the same plane. 13. Isothermal packaging according to any one of claims 9 to 12, such as the second or the plurality of second heat-insulating elements hollow wall (s) based on at least one isothermal natural material of honeycomb structure or cork ( 21) comprises following the second sheet based on at least one isothermal natural material (12), an additional structure (14) comprising at least one gas strip (141) and a sheet based on at least one isothermal natural material (142), said structure being reproduced n times, with n an integer greater than or equal to 1. 14. Isothermal packaging according to any one of claims 9 to 13, such that the sheets (10, 12) constituting the second or the plurality of second heat-insulating elements hollow wall (s) based on at least one material natural isothermal structure of 0 alveolar or cork (21) are cork-based in expanded form, natural or agglomerated An isothermal package according to any one of claims 9 to 14, such that the gas strip (11) comprises at least one gas selected from nitrogen, oxygen, carbon dioxide, argon, krypton and their mixtures. 16. Isothermal packaging according to any one of claims 9 to 15, such as one or more modules based on at least one isothermal natural material (130), is (are) in the form of excrescences emanating from the at least one sheet based on at least one isothermal natural material (10, 12). 17. Isothermal packaging according to any one of claims 9 to 16, such that at least a part or all of the at least one sheet based on at least one isothermal natural material (10, 12) is coated with at least a thermal insulating material (100, 120). 18. Isothermal packaging according to any one of claims 9 to 17, such as the second or the plurality of second thermally insulating hollow wall elements (s) based on at least one isothermal natural material of honeycomb structure or cork (21). ) comprises one or more stiffening means (15), the means (s) being located in the gas strip (11), the one or more means comprising one or more imitates of isothermal natural material (150), the ) said unit (s) (150) in the form of excrescences emanating from at least one sheet based on at least one isothermal natural material (10, 12) or being added to said sheet (10, 12), said stiffening means (15) also comprising second fastening means (151), said second fastening means (151) and the said stiffening unit (s) (150) forming the stiffening means (15), being merged or not. 19. Isothermal packaging according to any one of claims 9 to 18, such as the second or the plurality of second heat-insulating elements with hollow wall (s) based on at least one isothermal natural material of honeycomb structure or cork ( 21) comprises, on at least one wafer (16), a first mechanical type assembly means (161) in the form of at least one rabbet and / or at least one mortise and / or at least one blind hole and / or at least one tenon.