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US 11,999,132 B2Granted
Heat sealable packaging material comprising microfibrillated cellulose and products made therefrom
AssigneeStora Enso OYJ
InventorsKaj Backfolk, Isto Heiskanen, Esa Saukkonen, Jukka Kankkunen, Ville Ribu, Kimmo Nevalainen
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Abstract
The present invention is directed to a packaging material comprising a layer of microfibrillated cellulose (MFC) and an aluminum layer having a thickness of 0.1-20 μm, wherein the layer comprising MFC and/or the aluminum layer has been laminated or extrusion coated on at least one side with a thermoplastic polymer and wherein the amount of aluminum is sufficient to make the packaging material heat sealable by induction. The MFC layer contains at least 60% by weight of microfibrillated cellulose.
Claims11
A packaging material comprising:
- a layer that comprises at least 60% by weight of microfibrillated cellulose, and
- a continuous aluminum layer having a thickness of 1 to less than 3 μm and an amount of aluminum of 3 to 10 g/m2 packaging material,
- wherein the layer comprising microfibrillated cellulose is laminated or extrusion coated with a thermoplastic polymer in an amount of at least 5 g/m2 and the amount of aluminum is sufficient to make the packaging material heat sealable by induction;
- wherein the layer comprising microfibrillated cellulose has a grammage between 10 to 50 g/m2 and an oxygen transmission rate of less than 20 cm3/m2·day (50% RH, 23° C.);
- and
- wherein the packaging material exhibits an oxygen transmission rate of less than 5 cm3/m2·day (50% RH, 23° C.).
3 more elements
Dependencies are inferred from the claim text.