Invention Publication
- Patent Title: MULTILAYER FILM COMPRISING HIGHLY REFINED CELLULOSE FIBERS
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Application No.: US17995445Application Date: 2021-04-14
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Publication No.: US20230151552A1Publication Date: 2023-05-18
- Inventor: Isto Heiskanen , Kaj Backfolk , Anna Kauppi , Jukka Kankkunen
- Applicant: Stora Enso OYJ
- Applicant Address: FI Helsinki
- Assignee: Stora Enso OYJ
- Current Assignee: Stora Enso OYJ
- Current Assignee Address: FI Helsinki
- Priority: SE 504247 2020.04.15
- International Application: PCT/IB2021/053071 2021.04.14
- Date entered country: 2022-10-04
- Main IPC: D21H27/38
- IPC: D21H27/38 ; D21H11/18 ; D21F11/04 ; D21H21/26

Abstract:
The present invention relates to a method for manufacturing a multilayer film comprising highly refined cellulose fibers, the method comprising the steps of: a) forming a first wet web by applying a first pulp suspension comprising highly refined cellulose fibers on a first wire; b) partially dewatering the first wet web to obtain a first partially dewatered web; c) forming a second wet web by applying a second pulp suspension comprising highly refined cellulose fibers on a second wire; d) partially dewatering the second wet web to obtain a second partially dewatered web; e) joining the first and second partially dewatered web to obtain a multilayer web; and f) further dewatering, and optionally drying, the multilayer web to obtain a multilayer film comprising highly refined cellulose fibers.
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