公开(公告)号：US10676868B2

公开(公告)日：2020-06-09

申请号：US15759089

申请日：2016-09-16

Applicant: Stora Enso OYJ

Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Esa Saukkonen ,  Nina Ruohoniemi ,  Katja Lyytikainen

IPC: D21H11/18 ,  D21H21/20 ,  B29D7/01 ,  C08J5/18 ,  D21C9/00 ,  D21H11/20

Abstract: The present invention relates to a method for manufacturing a film having an oxygen transmission rate in the range of from 1 cc/m2/24 h to 500 cc/m2/24 h according to ASTM D-3985, at a relative humidity of more than 50% at 25° C., or higher than 75% at 25° C., or higher than 85% at 25° C., wherein the method comprises the steps of: providing a first suspension comprising a microfibrillated cellulose, wherein the dry content of the suspension is in the range of from 0.1 to 10% by weight, adding a wet strength additive to said first suspension, at an amount of from 0.1 to 10 weight-% based on the amount of microfibrillated cellulose (dry/dry), thereby forming a mixture of the microfibrillated cellulose and the wet strength additive, applying said mixture to a substrate to form a fibrous web and drying said web to form said film. The present invention also relates to a film produced according to the method.

公开(公告)号：US20190048527A1

公开(公告)日：2019-02-14

申请号：US15759089

申请日：2016-09-16

Applicant: Stora Enso OYJ

Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Esa Saukkonen ,  Nina Ruohoniemi ,  Katja Lyytikainen

IPC: D21H11/18 ,  B29D7/01 ,  C08J5/18 ,  D21H21/20 ,  D21C9/00 ,  D21H11/20

CPC classification number: D21H11/18 ,  B29D7/01 ,  C08J5/18 ,  C08J2301/00 ,  D21C9/007 ,  D21H11/20 ,  D21H21/20

Abstract: The present invention relates to a method for manufacturing a film having an oxygen transmission rate in the range of from 1 cc/m2/24 h to 500 cc/m2/24 h according to ASTM D-3985, at a relative humidity of more than 50% at 25° C., or higher than 75% at 25° C., or higher than 85% at 25° C., wherein the method comprises the steps of: providing a first suspension comprising a microfibrillated cellulose, wherein the dry content of the suspension is in the range of from 0.1 to 10% by weight, adding a wet strength additive to said first suspension, at an amount of from 0.1 to 10 weight-% based on the amount of microfibrillated cellulose (dry/dry), thereby forming a mixture of the microfibrillated cellulose and the wet strength additive, applying said mixture to a substrate to form a fibrous web and drying said web to form said film. The present invention also relates to a film produced according to the method.

公开(公告)号：US20180245286A1

公开(公告)日：2018-08-30

申请号：US15754692

申请日：2016-09-16

Applicant: Stora Enso OYJ

Inventor： Isto Heiskanen ,  Kaj Backfolk ,  Katja Lyytikainen

IPC: D21H11/18 ,  D21H27/30

CPC classification number: D21H11/18 ,  D21H27/30

Abstract: A method of manufacturing a film comprising microfibrillated cellulose, wherein the method comprises the steps of: providing a first suspension comprising microfibrillated cellulose, having a dry content of from 0.2 to 2.0%, wherein the first suspension has a first Schopper-Riegler (SR) value; forming a first web of said suspension; at least partly dewatering said first web; applying a second suspension comprising microfibrillated cellulose, and/or fines and/or fibers onto a surface of said formed and at least partially dried first web, wherein the second suspension has a second Schopper-Riegler value which is higher than said first Schopper-Riegler value, thereby forming a film.

公开(公告)号：US20160060815A1

公开(公告)日：2016-03-03

申请号：US14786449

申请日：2014-04-22

Applicant: STORA ENSO OYJ

Inventor： Isto Heiskanen ,  Esa Saukkonen ,  Kaj Backfolk ,  Anna Kauppi ,  Heidi Saxell ,  Katja Lyytikainen

IPC: D21H21/30 ,  D21H11/04 ,  D21H21/28 ,  C08L1/02 ,  D21H17/37

CPC classification number: D21H21/30 ,  C08L1/02 ,  C08L2205/16 ,  D21H11/04 ,  D21H11/18 ,  D21H17/375 ,  D21H17/42 ,  D21H21/28 ,  C08L33/26

Abstract: The invention relates to a process for treating cellulose fibres which process comprises the steps of providing a slurry comprising cellulose fibers, adding anionic polyacrylamide (A-PAM) with high molar mass to the slurry in a first step and subjecting the slurry comprising fibers and A-PAM to a mechanical treatment in a second step thereby forming a composition comprising microfibrillated cellulose. The invention further relates to a composition produced according to the process.

Abstract translation: 本发明涉及一种处理纤维素纤维的方法，该方法包括以下步骤：提供包含纤维素纤维的浆料，在第一步中向浆料中加入高摩尔质量的阴离子聚丙烯酰胺（A-PAM），并对包含纤维和A -PAM在第二步中进行机械处理，由此形成包含微纤化纤维素的组合物。 本发明还涉及根据该方法生产的组合物。