Functionalized corrugated cardboard

1. A functionalized corrugated cardboard comprising:

a first and second facing sheet;

a first fluted sheet;

an intermediate sheet; and

a second fluted sheet,

wherein:

the intermediate sheet is disposed between the first fluted sheet and the second fluted sheet;

the first fluted sheet is bonded to the intermediate sheet;

the second fluted sheet is bonded to the intermediate sheet;

the first facing sheet consists of a first multilayer, functionalized plastic film; and

the intermediate sheet consists of a second multilayer, functionalized plastic film; and

the second facing sheet consists of a third multilayer, functionalized plastic film;

and wherein:

a structure of the first multilayer, functionalized plastic film and a structure of the second functionalized plastic film differ;

a composition of the layers of the first multilayer, functionalized plastic film and a composition of the layers of the second multilayer, functionalized plastic film differ;

a thickness of at least one of the layers of the first multilayer, functionalized plastic film and a thickness of at least one of the layers of the second multilayer, functionalized plastic film differ;

a number of layers of the first multilayer, functionalized plastic film and a number of layers forming the second multilayer, functionalized plastic film differ; and/or

the functionality of the first multilayer, functionalized plastic film and the functionality of the second multilayer, functionalized plastic film differ;

and wherein

the third multilayer, functionalized plastic film is the same or differs from the first multilayer, functionalized plastic film.

2. The functionalized corrugated cardboard as claimed in claim 1 , wherein:

the first multilayer, functionalized plastic film comprises at least first one layer functioning as a barrier layer against a first gas, against a first amount of moisture, against a migration of a first low-molecular-weight fraction, against an impairment of a first taste, against an impairment of a first odor, against a first oil, against a first fat, or against a first liquid;

the second multilayer, functionalized plastic film comprises at least one second layer functioning as a barrier layer against a second gas, against a second amount of moisture, against a migration of a second low-molecular-weight fraction, against an impairment of a second taste, against an impairment of a second odor, against a second oil, against a second fat, or against a second liquid.

3. The functionalized corrugated cardboard as claimed in claim 1 , wherein the first multilayer, functionalized plastic filmcomprises at least one of an absorption layer for a liquid, a surface layer comprising a release coating, a printed layer with information, a printed layer with an identification, a printed layer with information and an identification, a decorative layer, and a layer for improving a mechanical property of the functionalized corrugated cardboard.

4. The functionalized corrugated cardboard as claimed in claim 1 , wherein the first multilayer, functionalized plastic film comprises:

a first surface layer which is optionally sealable or comprises a release coating;

optionally a first adhesion-promoter layer;

a functional layer;

optionally a second adhesion-promoter layer; and

a second surface layer comprising an optionally sealable layer;

wherein:

the functional layer is disposed between the first surface layer and the second surface layer;

the first adhesion-promoter layer, when present, is disposed between the first surface layer and the functional layer; and

the second adhesion-promoter layer, when present, is disposed between the second surface layer and the functional layer.

5. The functionalized corrugated cardboard as claimed in claim 4 , wherein:

the first surface layer is sealable and comprises a polyolefin layer comprising a thermoplastic polyolefin homopolymer, a thermoplastic polyolefin copolymer, or a mixture thereof;

when present, the first adhesion-promoter layer comprises a layer based on a first modified, thermoplastic polyolefin; and

when present, the second adhesion-promoter layer comprises a layer based on a second modified, thermoplastic polyolefin.

6. The functionalized corrugated cardboard as claimed in claim 4 , wherein the functional layer is based on a thermoplastic polymer comprising an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, a vinylidene chloride copolymer, or a mixture thereof further comprising an ethylene-vinyl acetate copolymer.

7. The functionalized corrugated cardboard as claimed in claim 4 , wherein the functional layer is based on at least one thermoplastic aliphatic polyamide, at least one thermoplastic (semi)aromatic polyamide, at least one copolyamide, or a mixture thereof.

8. The functionalized corrugated cardboard as claimed in claim 4 , wherein the functional layer is based on a polymer which is superabsorbent.

9. The functionalized corrugated cardboard as claimed in claim 4 , wherein:

the first adhesion-promoter is present;

the second adhesion-promoter is present; and

the first multilayer, functionalized plastic film further comprises a third adhesion-promoter layer, a fourth adhesion-promoter layer, and an additional functional layer.

10. The functionalized corrugated cardboard as claimed in claim 1 , wherein the first multilayer, functionalized plastic film has a total thickness from 35 to 350 μm.

11. The functionalized corrugated cardboard as claimed in claim 1 , wherein the functionalized corrugated cardboard further comprises a very fine flute or a microflute.

12. The functionalized corrugated cardboard as claimed in claim 1 , wherein the second multilayer, functionalized plastic film comprises:

a first surface layer which is optionally;

a functional layer;

optionally a second adhesion-promoter layer; and

a second surface layer comprising an optionally sealable layer;

wherein:

the functional layer is disposed between the first surface layer and the second surface layer;

the first adhesion-promoter layer, when present, is disposed between the first surface layer and the functional layer; and

the second adhesion-promoter layer, when present, is disposed between the second surface layer and the functional layer.

13. The functionalized corrugated cardboard as claimed in claim 12 , wherein:

the first surface layer is sealable and comprises a polyolefin layer comprising a thermoplastic polyolefin homopolymer, a thermoplastic polyolefin copolymer, an olefin copolymer, or a mixture thereof;

when present, the first adhesion-promoter layer comprises a layer based on a first modified, thermoplastic polyolefin; and

when present, the second adhesion-promoter layer comprises a layer based on a second modified, thermoplastic polyolefin.

14. The functionalized corrugated cardboard as claimed in claim 12 , wherein the functional layer is based on a thermoplastic polymer comprising an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, a vinylidene chloride copolymer, or a mixture thereof further comprising an ethylene-vinyl acetate copolymer.

15. The functionalized corrugated cardboard as claimed in claim 12 , wherein the functional layer is based on at least one thermoplastic aliphatic polyamide, at least one thermoplastic (semi)aromatic polyamide, at least one copolyamide, or a mixture thereof.

16. The functionalized corrugated cardboard as claimed in claim 12 , wherein the functional layer is based on a polymer which is superabsorbent.

17. The functionalized corrugated cardboard as claimed in claim 12 , wherein:

the first adhesion-promoter is present;

the second adhesion-promoter is present; and

the first multilayer, functionalized plastic film further comprises a third adhesion-promoter layer, a fourth adhesion-promoter layer, and an additional functional layer.

18. The functionalized corrugated cardboard as claimed in claim 1 , wherein the second multilayer, functionalized plastic film has a total thickness from 35 to 350 μm.

19. The functionalized corrugated cardboard as claimed in claim 1 , wherein:

a structure of the first multilayer, functionalized plastic film and a structure of the third functionalized plastic film differ;

a composition of the layers of the first multilayer, functionalized plastic film and a composition of the layers of the third multilayer, functionalized plastic film differ;

a thickness of at least one of the layers of the first multilayer, functionalized plastic film and a thickness of an at least one of the layers of the third multilayer, functionalized plastic film differ;

a number of layers of the first multilayer, functionalized plastic film and a number of layers forming the third multilayer, functionalized plastic film differ; and/or

the functionality of the first multilayer, functionalized plastic film and the functionality of the third multilayer, functionalized plastic film differ.