A method for manufacturing a packaging material and a packaging material made by the method

Patent metadata

Field	Value
Publication number	US-2016376750-A1
Application number	US-201515125616-A
Country	US
Kind code	A1
Filing date	Mar 13, 2015
Priority date	Mar 14, 2014
Publication date	Dec 29, 2016
Grant date	—

Abstract

The invention refers to a method to produce a packaging material comprising the steps of; treating at least one surface of a paperboard substrate with a binder and with a metal salt, printing at least a part of said treated surface with ink, and applying at least one polymer layer on said printed surface. The packaging material produced in accordance with the invention shows good printability and simultaneously good adhesion of the applied polymer layer.

First claim

1 . A method of manufacturing a packaging material comprising the steps of:
providing a paperboard substrate, comprising cellulosic fibres, treating at least one surface of said substrate with a binder and with a metal salt, printing at least a part of said treated surface with ink, and applying at least one polymer layer on said printed surface.

2 . A method according to claim 1 , wherein the binder is chosen from the group of microfibrillated cellulose (MFC), starch, polyDADMAC, carboxymethyl cellulose (CMC), polyvinylpyrrolidone (PVP), polyvinyl alcohol (PVA), polyethyleneimine (PEI) and polyethylene glycol (PEG) and/or any combination of these.

3 . A method according to claim 1 , wherein the binder comprises MFC which is applied to the surface in an amount of at least 0.1 g/m 2 .

4 . A method according to claim 1 , wherein the binder comprises starch which is applied to the surface in an amount of at least 0.1 g/m 2 .

5 . A method according to claim 1 , wherein the binder comprises polyDADMAC which is applied to the surface in an amount of at least 0.05 g/m 2 .

6 . A method according to claim 1 , wherein the binder is applied in a separate step, prior to the treatment of the surface with a metal salt.

7 . A method according to claim 1 , wherein the treatment with a binder and a metal salt is done by addition of a composition comprising a binder and a metal salt to the surface of the paperboard substrate.

8 . A method according to claim 1 , wherein the metal salt is applied to the surface in an amount of at least 0.01 g/m 2 .

9 . A method according to claim 1 , wherein the polymer layer comprises polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP), polylactic acid (PLA), combinations thereof, and/or biobased materials of any of these.

10 . A packaging material made by the method of claim 1 .

11 . A packaging material comprising:
a paperboard substrate, a first, innermost, layer comprising a binder, a second layer, applied on said first layer, comprising a metal salt, aqueous based ink printed on at least a part of said second layer, and a thermoplastic polymer layer applied on said printed second layer.

12 . A packaging material comprising:
a paperboard substrate, an innermost layer comprising a binder and a metal salt, aqueous based ink printed on at least a part of said innermost layer, and a thermoplastic polymer layer applied on said printed innermost layer.

13 . A method as in claim 1 , wherein the metal salt is applied to the surface in an amount of at least 0.1 g/m 2 .

Assignees

• Stora Enso Oyj

Inventors

• Miikki Nina
• Sirviö Petri
• Backfolk Kaj

Classifications

• B32B2307/75

  Printability · CPC title

• B32B27/36

  comprising polyesters · CPC title

• D21H21/18

  Reinforcing agents · CPC title

• B41M5/5254

  characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title