Invention Application
- Patent Title: MULTILAYER FILM COMPRISING MFC
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Application No.: PCT/IB2021/057940Application Date: 2021-08-31
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Publication No.: WO2022049482A1Publication Date: 2022-03-10
- Inventor: HEISKANEN, Isto , BACKFOLK, Kaj , KAUPPI, Anna , LYYTIKÄINEN, Katja , KANKKUNEN, Jukka , KORVENNIEMI, Juha
- Applicant: STORA ENSO OYJ
- Applicant Address: P.O. Box 309
- Assignee: STORA ENSO OYJ
- Current Assignee: STORA ENSO OYJ
- Current Assignee Address: P.O. Box 309
- Agency: PERSSON, Kristin
- Priority: SE2051029-3 2020-09-01
- Main IPC: D21H11/18
- IPC: D21H11/18 ; B32B29/02 ; D21F11/08 ; D21H27/30
Abstract:
The present invention relates to a method for manufacturing a multilayer film comprising microfibrillated cellulose (MFC) in a paper-making machine, the method comprising the steps of: a) forming a bottom web layer by applying a first pulp suspension comprising at least 50% by dry weight of cellulose based fibrous material having an SR (Schopper-Riegler) value in the range of 18-75 on a bottom web wire; b) forming or applying an intermediate web layer formed from a second pulp suspension comprising at least 50% by dry weight of MFC having an SR value in the range of 80-100 on the bottom web layer; c) applying a top web layer formed from a third pulp suspension comprising at least 50% by dry weight of cellulose based fibrous material having an SR (Schopper-Riegler) value in the range of 18-75 on the intermediate web layer to form a multilayer web; and d) dewatering, and optionally drying, the formed multilayer web to obtain a multilayer film comprising MFC.
Information query