公开(公告)号：US20240309558A1

公开(公告)日：2024-09-19

申请号：US18575919

申请日：2022-07-04

Applicant: TREETOTEXTILE AB

Inventor： Artur HEDLUND ,  Bengt HAGSTRÖM

IPC: D01D5/06 ,  D01D4/02 ,  D01D5/253 ,  D01F2/02

CPC classification number: D01D5/06 ,  D01D4/02 ,  D01D5/253 ,  D01F2/02 ,  D10B2201/20

Abstract: Disclosed is a process for spinning an alkaline cellulose spin dope, comprising dissolved cellulose, to cellulose filaments (10). The process comprising the steps of: —feeding the alkaline cellulose spin dope to at least one spinning head (20) with a plurality of holes (21), wherein the spinning head (20) comprises at least two parallel, rectangular spinneret dies (22), each with a plurality of holes (21), the spinneret dies (22) being arranged spaced apart with a flow spacing (23) in between them; —extruding the alkaline cellulose spin dope through the plurality of holes (21) into a flow (35) of aqueous alkaline coagulation bath liquid, the aqueous alkaline coagulation bath liquid comprising a sodium coagulation salt, whereby forming cellulose filaments (10), wherein the aqueous alkaline coagulation bath liquid flows through the flow spacing (23) and then past the spinneret dies (22) in a flow direction, the flow direction of the aqueous alkaline coagulation bath liquid being parallel to the direction in which the alkaline cellulose spin dope is extruded into the aqueous alkaline coagulation bath liquid; and —withdrawing the cellulose filaments (10) from the aqueous alkaline coagulation bath liquid.

公开(公告)号：US20230365718A1

公开(公告)日：2023-11-16

申请号：US18226465

申请日：2023-07-26

Applicant: TREETOTEXTILE AB

Inventor： Carina OLSSON ,  Bengt HAGSTRÖM ,  Tobias KÖHNKE

IPC: C08B1/00 ,  D01D1/02 ,  D01F2/02 ,  B01F33/82 ,  C08J3/05

CPC classification number: C08B1/003 ,  B01F33/821 ,  C08J3/05 ,  D01D1/02 ,  D01F2/02 ,  C08K2003/2296

Abstract: The present disclosure describes a method for the production of a spinning dope composition, said method comprising a homogenization involving mixing a cellulosic pulp material in alkali solution, mixing implying supplying a power density to agitators used in the homogenization of at least 150 kW/m3 (kW supplied to agitators per mixed unit of liquid volume), and thereafter a dissolution involving mixing of the cellulosic pulp material in the alkali solution to obtain a spinning dope composition, wherein the power density supplied to agitators used in the dissolution step is maximum 75 kW/m3 (kW supplied to agitators per mixed unit of liquid volume); and wherein the cellulosic pulp material in alkali solution is kept at a temperature of less than 0° C. during the homogenization and during at least part of the dissolution. The present disclosure is also directed to a system intended for the production of a spinning dope composition.

公开(公告)号：US20190185586A1

公开(公告)日：2019-06-20

申请号：US16093271

申请日：2017-04-12

Applicant: TREETOTEXTILE AB

Inventor： Carina OLSSON ,  Bengt HAGSTRÖM ,  Tobias KÖHNKE

IPC: C08B1/00 ,  D01D1/02 ,  D01F2/02 ,  C08J3/05

CPC classification number: C08B1/003 ,  C08J3/05 ,  D01D1/02 ,  D01F2/02

Abstract: The present invention describes a method for the production of a spinning dope composition, said method comprising a homogenization involving vigorous mixing of a cellulosic pulp material in alkali solution, vigorous mixing implying supplying a power density to agitators used in the homogenization step of at least 150 k W/m3 (k W supplied to agitators per mixed unit of liquid volume), and thereafter a dissolution involving mixing of the cellulosic pulp material in the alkali solution to obtain a spinning dope composition, wherein the power density supplied to agitators used in the dissolution step is maximum 75 k W/m3 (k W supplied to agitators per mixed unit of liquid volume); and wherein the cellulosic pulp material in alkali solution is kept at a temperature of less than 0° C. during the homogenization and during at least part of the dissolution. The present invention is also directed to a system intended for the production of a spinning dope composition.

公开(公告)号：US20250051969A1

公开(公告)日：2025-02-13

申请号：US18933506

申请日：2024-10-31

Applicant: TREETOTEXTILE AB

Inventor： Bengt HAGSTRÖM ,  Tobias KÖHNKE ,  Jonas ENGSTRÖM

IPC: D01D5/06 ,  D01D5/22 ,  D01D10/06 ,  D01F1/10 ,  D01F2/24

Abstract: A process for forming a fiber tow, involves a wet spinning procedure comprising: dissolving cellulose pulp in an alkaline aqueous solvent to form a cellulose spin dope composition; spinning the cellulose spin dope composition in a coagulation bath having a pH of more than 7.0, preferably a pH of at least 10, to produce a fiber tow; and passing the produced fiber tow through a sequence of consecutive stretching and washing steps in which the formed fiber tow is washed with a washing liquid by a counter-current flow washing procedure.

公开(公告)号：US20210301033A1

公开(公告)日：2021-09-30

申请号：US17346293

申请日：2021-06-13

Applicant: TREETOTEXTILE AB

Inventor： Carina OLSSON ,  Bengt HAGSTRÖM ,  Tobias KÖHNKE

IPC: C08B1/00 ,  D01D1/02 ,  D01F2/02 ,  C08J3/05

Abstract: The present invention describes a method for the production of a spinning dope composition, said method comprising a homogenization involving vigorous mixing of a cellulosic pulp material in alkali solution, vigorous mixing implying supplying a power density to agitators used in the homogenization step of at least 150 kW/m3 (kW supplied to agitators per mixed unit of liquid volume), and thereafter a dissolution involving mixing of the cellulosic pulp material in the alkali solution to obtain a spinning dope composition, wherein the power density supplied to agitators used in the dissolution step is maximum 75 kW/m3 (kW supplied to agitators per mixed unit of liquid volume); and wherein the cellulosic pulp material in alkali solution is kept at a temperature of less than 0° C. during the homogenization and during at least part of the dissolution. The present invention is also directed to a system intended for the production of a spinning dope composition.