Method for manufacturing a laminated packaging material, the laminated packaging material and packaging containers made therefrom

Patent metadata

Field	Value
Publication number	US-10994525-B2
Application number	US-201615779336-A
Country	US
Kind code	B2
Filing date	Nov 25, 2016
Priority date	Nov 27, 2015
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The present invention relates to a method for manufacturing of a laminated cellulose-based liquid or semi-liquid food packaging material, wherein the laminated packaging material has a bulk material layer, wherein a further sheet is laminated to the bulk material layer by an aqueous adhesive composition. The invention further relates the laminated packaging materials obtained by the method and to a packaging container for liquid food packaging, comprising the laminated packaging material or being made from the laminated packaging material obtained by the method.

First claim

The invention claimed is:

1. Method of manufacturing a laminated packaging material for liquid food carton packaging, the method comprising:
providing a first web comprising a layer A of paper or paperboard or other cellulose-based material,
providing a second web comprising a film or sheet B,
applying an aqueous composition comprising an adhesive, at an amount from 1 to 4 g/m 2 , dry content, onto the surface of one of the first and second webs,
forwarding the first and second webs, one of which having the aqueous adhesive composition applied to its surface, towards a pressure roller nip to be joined and laminated together by the interjacent aqueous adhesive composition while passing the nip, and while the aqueous adhesive composition is partly absorbed into at least one of the first and second web surfaces of A and B, and wherein there is no forced drying or curing or crosslinking of the applied aqueous adhesive composition,
applying two heat sealable thermoplastic layers so that the first web comprising the layer A of paper or paperboard or other cellulose-based material and the second web comprising the film or sheet B are positioned between the two heat sealable thermoplastic layers and so that the two heat sealable thermoplastic layers are outermost layers in the laminated packaging material, and
winding the first and second webs which have been joined and laminated together by the interjacent aqueous adhesive composition after passing through the pressure roller nip onto a reel, and the applying of the two heat sealable thermoplastic layers occurring after the first and second webs which have been joined and laminated together by the interjacent aqueous adhesive composition are unwound from the reel.

2. Method as claimed in claim 1 , wherein the lamination is taking place at ambient temperature.

3. Method as claimed in claim 1 , wherein the layer A is a bulk layer in the laminated packaging material.

4. Method as claimed in claim 1 , wherein the aqueous adhesive composition comprises an adhesive binder polymer selected from the group consisting of polyvinyl alcohol (PVOH), polysaccharides and polysaccharide derivatives.

5. Method as claimed in claim 1 , wherein the second web of the film or sheet B has a surface roughness of 200 Bendtsen or lower, as defined by SCAN (Scandinavian Pulp and Paper Norms) P21-67 and in TAPPI UM535 (ISO 8791-2), and wherein the aqueous adhesive composition is applied onto the second web.

6. Method as claimed in claim 5 , wherein the aqueous adhesive composition comprises an acrylic-modified polyolefin adhesive polymer, and the aqueous adhesisve composition has a solids content from 30 to 50 weight %.

7. Method as claimed in claim 5 , wherein the aqueous adhesive composition comprises an adhesive binder polymer and the amount of applied adhesive binder polymer is from 0.5 to 2 g/m 2 .

8. Method as claimed in claim 1 , wherein the web of film or sheet B is a paper or paperboard or cellulose-based layer, and the aqueous adhesive composition comprises an adhesive binder polymer selected from PVOH, polyvinyl acetate, starch or starch derivatives and cellulose or cellulose derivatives.

9. Method as claimed in claim 5 , wherein the aqueous adhesive composition comprises an adhesive binder polymer and the adhesive binder polymer is applied at an amount from 1 to 3 g/m 2 , dry content.

10. Method as claimed in claim 1 , wherein the layer A has a moisture content from 5 to 10%.

11. Method as claimed in claim 1 , wherein the layer A has a surface roughness of 300 Bendtsen or higher, as defined by SCAN (Scandinavian Pulp and Paper Norms) P21-67 and in TAPPI UM535 (ISO 8791-2).

12. Method as claimed in claim 1 , wherein a web speed of lamination through the roller nip is at least 200 m/min.

13. Method as claimed in claim 1 , wherein the adhesion between layer A and film or sheet B is at least 60 N/m.

14. Method as claimed in claim 1 , wherein the film or sheet B is laminated to the outside of layer A so that the film or sheet B is on an outside of a packaging container made from the packaging material, and comprises a print substrate or a pre-laminated structure comprising a print substrate comprising a printed decorative pattern, and an outer transparent, protective polymer layer.

15. Method as claimed in claim 1 , wherein the film or sheet B is laminated to the inside of layer A so that the film or sheet B is on inside of a packaging container made from the packaging material, and comprises at least one barrier layer or barrier coating.

16. Method as claimed in claim 1 , wherein the layer A has a moisture content from 5.5 to 7.5%.

17. Method of manufacturing a laminated packaging material configured to be converted into liquid food carton packaging, the laminated packaging material that is converted into liquid food carton packaging comprising multiple layers, the method comprising:
providing a first web comprising a layer A of paper or paperboard or other cellulose-based material, the layer A of the paper or paperboard or other cellulose-based material being the thickest of all of the multiple layers of the laminated packaging material and contributing most to mechanical properties and dimensional stability of the laminated packaging material, the layer A having a moisture content from 5% to 10% and a surface roughness of 300 Bendtsen or higher as defined by SCAN (Scandinavian Pulp and Paper Norms) P21-67 and in TAPPI UM535 (ISO 8791-2);
providing a second web comprising a film or sheet B, the second web comprising the film or sheet B being a metallised polymer film;
applying an aqueous composition comprising an adhesive, at an amount from 1 to 4 g/m 2 , dry content, onto the surface of one of the first and second webs;
forwarding the first and second webs, one of which has the aqueous adhesive composition applied to its surface, towards a pressure roller nip to be joined and laminated together by the interjacent aqueous adhesive composition while passing the nip, and while the aqueous adhesive composition is partly absorbed into at least one of the first and second web surfaces of A and B;
after the applying of the aqueous adhesive composition onto the surface of one of the first and second webs there is no forced drying or curing or crosslinking of the applied aqueous adhesive composition; and
applying two heat sealable thermoplastic layers so that the first web comprising the layer A of paper or paperboard or other cellulose-based material and the second web comprising the film or sheet B are positioned between the two heat sealable thermoplastic layers and so that the two heat sealable thermoplastic layers are outermost layers of the multiple layers of the laminated packaging material, and
winding the first and second webs which have been joined and laminated together by the interjacent aqueous adhesive composition after passing through the pressure roller nip onto a reel, and the applying of the two heat sealable thermoplastic layers occurring after the first and second webs which have been joined and laminated together by the interjacent aqueous adhesive composition are unwound from the reel.

18. Method as claimed in claim 17 , wherein the aqueous adhesive composition comprises an adhesive binder polymer selected from the group consisting of polyvinyl alcohol (PVOH), polysaccharides and polysaccharide derivatives.

19. Method of manufacturing a laminated packaging material configured to be converted into liquid food carton packaging, the laminated packaging material that is converted into liquid food carton

Assignees

• Tetra Laval Holdings & Finance

Inventors

• Öhman Peter
• Collaud Alain
• Berlin Mikael
• Balogh Joakim
• Ewing Teresa

Classifications

• B32B2307/748

  Releasability · CPC title

• B32B2307/518

  bi-axially · CPC title

• B32B27/10

  of paper or cardboard · CPC title

• B32B2307/402

  Coloured · CPC title

• B32B2307/718

  Weight, e.g. weight per square meter · CPC title