Invention Grant
- Patent Title: Paper or paperboard product comprising at least one ply containing high yield pulp and its production method
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Application No.: US16334371Application Date: 2017-09-20
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Publication No.: US11299853B2Publication Date: 2022-04-12
- Inventor: Hans Hoglund , Gunilla Pettersson , Sven Norgren , Per Engstrand
- Applicant: Hans Hoglund , Gunilla Pettersson , Sven Norgren , Per Engstrand
- Applicant Address: SE Matfors; SE Sundsvall; SE Sundsvall; SE Aby
- Assignee: Hans Hoglund,Gunilla Pettersson,Sven Norgren,Per Engstrand
- Current Assignee: Hans Hoglund,Gunilla Pettersson,Sven Norgren,Per Engstrand
- Current Assignee Address: SE Matfors; SE Sundsvall; SE Sundsvall; SE Aby
- Agency: Schott, P.C.
- Priority: SE1630229-1 20160921
- International Application: PCT/EP2017/073745 WO 20170920
- International Announcement: WO2018/054957 WO 20180329
- Main IPC: D21F3/02
- IPC: D21F3/02 ; D21H11/02 ; D21H11/08 ; D21H11/10

Abstract:
A method of producing a paper or paperboard product having at least one ply comprising high yield pulp (HYP), comprising the steps of: —providing a furnish comprising at least 50% of high yield pulp (HYP) of a total pulp content in said furnish, said high yield pulp being produced with a wood yield above 85%; —dewatering the furnish to form a moist web and pressing said moist web to a dry solids content of at least 40-70%; and —densifying the moist web to a density above 600 kg/m3 in a press nip of a paper machine at a temperature above a softening temperature of water-saturated lignin comprised in said high yield pulp to provide a paper or paperboard product, containing at least 30% high yield pulp (HYP) of a total pulp content of said product.
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