EP0977802A1 - Procede de production de corps moules cellulosiques - Google Patents

Procede de production de corps moules cellulosiques

Info

Publication number
EP0977802A1
EP0977802A1 EP98916619A EP98916619A EP0977802A1 EP 0977802 A1 EP0977802 A1 EP 0977802A1 EP 98916619 A EP98916619 A EP 98916619A EP 98916619 A EP98916619 A EP 98916619A EP 0977802 A1 EP0977802 A1 EP 0977802A1
Authority
EP
European Patent Office
Prior art keywords
film
extrusion
solution
mass
gap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98916619A
Other languages
German (de)
English (en)
Inventor
Christian Schlossnikl
Siegfried Ambrosch
Heinrich Firgo
Peter Gspaltl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lenzing AG
Original Assignee
Lenzing AG
Chemiefaser Lenzing AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lenzing AG, Chemiefaser Lenzing AG filed Critical Lenzing AG
Publication of EP0977802A1 publication Critical patent/EP0977802A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets
    • B29D7/01—Films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2001/00—Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
    • B29K2001/08—Cellulose derivatives
    • B29K2001/12—Cellulose acetate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/02—Cellulose; Modified cellulose

Definitions

  • the present invention relates to a process for producing cellulosic moldings, in particular flat films and cellulosic membranes in the form of flat membranes, a solution of cellulose in an aqueous tertiary amine oxide being extruded by means of an extrusion die which has an extrusion gap, the solution being shaped in the form of a film , and the solution is passed through an air gap into a precipitation bath.
  • tertiary amine oxides can dissolve cellulose and that cellulosic shaped bodies such as fibers can be obtained from these solutions by precipitation.
  • a method for producing such solutions is known for example from EP-N - 0356419.
  • a suspension of cellulose in an aqueous tertiary amine oxide is first prepared.
  • the amine oxide contains up to 40% by mass of water.
  • the aqueous cellulose suspension is heated and water is drawn off under reduced pressure until the cellulose dissolves.
  • a process for the production of cellulosic threads is also known from DE-N-28 30 685, according to which a solution of cellulose in a tertiary amine oxide is formed into filaments in a warm state, the filaments are cooled with air and then introduced into a precipitation bath to precipitate the dissolved cellulose. The surface of the spun threads is further wetted with water to reduce their tendency to stick to adjacent threads.
  • a device and a method for producing seamless tubular films is known from WO 93/13670. According to this known method, the cellulose solution is formed into a tube by an extrusion nozzle with an annular extrusion gap, which tube is pulled over a cylindrical mandrel and introduced into the precipitation bath.
  • the tubular films obtained have wet strengths of approximately 10 to 30 N / mm 2 .
  • WO 95/07811 also describes an apparatus and a method for producing cellulosic tubular films.
  • WO 95/35340 describes a blowing process for the production of oriented cellulosic films, the cellulose solution being extruded downward into a precipitation bath via a film blowing nozzle and an air gap. It is mentioned that stretching transverse to the transport direction of the blown film can be achieved via the gas pressure in the interior of the blown film and that the ratio of mechanical longitudinal to transverse properties can be set.
  • EP-A-0 042 517 discloses the production of dialysis membranes by extrusion of the cellulose solution through nozzles with a length of 18 cm.
  • DE-A - 195 15 137 proposes, for the production of flat films, first of all to produce tubular films by means of an annular nozzle, which are then cut into flat films. A special film blowing device is used to produce the tubular films, with which the extruded tube is stretched in the air gap not only in the withdrawal direction but also in the transverse direction. This is achieved through an effective gas pressure inside the hose, which stretches the hose.
  • thermoplastic polymers such as, for example, polyethylene or polypropylene
  • films with a substantially better thickness distribution transverse to the direction of extrusion can be achieved with flat dies than is possible with round dies.
  • the permeability of the membranes is an essential property. To solve certain separation tasks, it is important to select membranes with permeability, pore size and pore structure that are optimized for the separation task.
  • Dialysis membranes made from regenerated cellulose in the form of flat films, tubular films or hollow fibers have been known for a long time, and the cellulose can be regenerated by the Cuoxam process, by the viscose process or by hydrolysis of cellulose acetate. Depending on the process used and the process conditions, membranes with different dialysis properties are obtained.
  • US Pat. No. 4,354,938 describes, for example, a process for the production of dialysis membranes by the viscose process, in which a tubular membrane is stretched between 40 and 120% before drying in the transverse direction by being inflated with air, which results in a membrane with an in Longitudinal and transverse direction leads to uniform orientation.
  • the membranes represented in this way are subject to shrinkage in the longitudinal and transverse directions of 0.5-10%.
  • the ultrafiltration performances are in the range between 2.5 ml / m 2 .h.mm Hg and 5.2 ml / m 2 .h.mm Hg with a wet thickness of 184 ⁇ m to 45 ⁇ m.
  • the complex step for producing tubular films is to be overcome.
  • An extrusion die is preferably used which has an extrusion gap with a length of at least 60 cm.
  • An advantageous embodiment of the method according to the invention is that the film-shaped solution is drawn off in the air gap in the extrusion direction at a speed which corresponds to 0.2 to 20 times the speed at which the film-shaped solution emerges from the extrusion gap.
  • the rate of withdrawal can thus be less than the rate of solution exit from the extrusion gap, e.g. in a ratio of 0.2: 1 to 0.9: 1 or greater than the rate at which the solution exits the extrusion gap, e.g. in a ratio of 2: 1 to 20: 1, preferably up to 10: 1.
  • the film-shaped solution can also be drawn off at the same or approximately the same speed at which it is extruded.
  • a further advantageous embodiment of the method according to the invention is characterized in that the film-shaped solution is stretched in the air gap in the extrusion direction and / or transversely to the extrusion direction.
  • the film-shaped solution can be stretched in the precipitation bath transversely to the direction of extrusion.
  • Another embodiment consists of leading the flat film out of the precipitation bath and then stretching it transversely to the direction of extrusion.
  • the film-shaped solution can be stretched in the air gap transversely to the extrusion direction with the aid of driven conveyor belts, which extend from the underside of the nozzle to the surface of the precipitation bath on both sides of the nozzle, as a result of which they are constantly wetted with precipitant and avoid sticking to the formed solution becomes.
  • driven conveyor belts which extend from the underside of the nozzle to the surface of the precipitation bath on both sides of the nozzle, as a result of which they are constantly wetted with precipitant and avoid sticking to the formed solution becomes.
  • the conveyor belts are inclined towards the surface of the precipitation bath, transport the formed solution through the air gap into the precipitation bath and thereby stretch the formed solution.
  • the extent of the stretching naturally depends on the angle that the conveyor belts form with the precipitation bath surface.
  • the film can also be stretched transversely to the transport direction in the precipitation bath or after the precipitation bath.
  • Other mechanisms customary in the plastics industry are also suitable for this stretching, for example those in the production of biaxially oriented polypropylene.
  • the air gap is expediently set to a length of at most 15 cm, in particular at most 3 cm.
  • the temperature of the cellulose solution during extrusion in the process according to the invention is best in the range from 80 ° C. to 120 ° C., in particular in the range from 85 ° C. to 95 ° C.
  • a further advantageous embodiment of the method according to the invention is characterized in that an extrusion die is used which has an extrusion gap with a width in the range from 50 ⁇ m and 2000 ⁇ m.
  • the process according to the invention is further characterized in that flat films can be produced with a balanced ratio of the mechanical longitudinal and transverse properties. Furthermore, films with high longitudinal strengths with only slightly reduced transverse properties can also be produced. It has proven to be expedient to lead the film out of the precipitation bath and to wash it, the film possibly being prevented from shrinking at the same time.
  • N-methylmorpholine-N-oxide has proven particularly useful as a tertiary amine oxide.
  • Drum drying, hot air drying, drying using infrared rays and microwaves and suction drum drying are particularly suitable drying processes.
  • drum drying the film can easily be prevented from shrinking by means of attached, moving belts.
  • the strength values of the film can be increased by a tension occurring during the drying process.
  • the properties of the flat films produced according to the invention can be adapted to the respective intended use by subsequent coating. It is e.g. possible to make the film hydrophobic, to influence the electrostatic behavior and the dyeability, to change the abrasion resistance and to make the film sealable.
  • the permeability of the membrane and thus also its ultrafiltration rate (UFR) can be influenced in particular by the choice of the speed at which the film-like solution is drawn off in the air gap. It shows that a lower withdrawal speed increases the permeability and thus the ultrafiltration rate of the membrane.
  • the permeability of the membrane is also changed by transverse stretching of the film-like solution or the film after entering the precipitation bath. Essential membrane properties can thus be controlled by the choice of the pull-off speed and by transverse stretching of the solution or the film.
  • the cellulosic flat film produced according to the invention is biodegradable and compostable and is particularly suitable as packaging material for food and other products, as a material for garbage bags and carrier bags, as a ngrar film, as a diaper film, as a substrate for composites, as an office film, as a household film or as a membrane, and for the separation of substance mixtures.
  • the ultrafiltration rate given in the examples is defined as the permeate volume passing through the membrane wall per unit of time, based on the membrane area and the test pressure.
  • V volume of liquid (permeate) [ml]
  • t time [h]
  • N membrane area [m 2 ]
  • p test pressure [mm Hg]
  • the cellulose solution formed as a flat film emerged from the nozzle at an outlet speed of 4.2 m min and was drawn off at the same speed. This means that the flat film was not stretched in the longitudinal direction in the air gap.
  • the film obtained had the following properties:
  • Thickness 67.0 ⁇ m
  • Example 2 The procedure was analogous to Example 1, but the cellulose solution used had a temperature of 110 ° C. and consisted of 13.8 mass% cellulose, 76.4 mass% NMMO and 9.8 mass% water, the extrusion gap of the flat die used being a width of 500 ⁇ m, the throughput was 75.6 kg / h, the air gap was 1 cm and the precipitation bath consisted of 98% by mass of water and 2% by mass of NMMO.
  • the exit speed was 5.0 m / min and the film was only pulled off at 90% of the exit speed.
  • the film obtained had the following properties: Width: 37.0 cm
  • Thickness 69.0 ⁇ m
  • Example 2 The procedure was analogous to Example 1, except that the cellulose solution used consisted of 15.0% by weight of cellulose, 74.6% by weight of NMMO and 10.4% by weight of water, the extrusion gap of the flat die used being 300 ⁇ m wide, the throughput was 37.8 kg / h and the air gap was 5 cm.
  • the exit speed was 4.2 m / min and the film was only pulled off at 40% of the exit speed.
  • the film obtained had the following properties:
  • Thickness 82.0 ⁇ m
  • Example 2 The procedure was analogous to Example 1, except that the cellulose solution used consisted of 14.6% by mass of cellulose, 75.6% by mass of NMMO and 9.8% by mass of water, the extension gap of the flat die used being 1000 ⁇ m wide, the throughput 113.4 kg / h betmg and the air gap was 2 cm.
  • the exit speed was 3.8 m / min and the film was pulled off at three times the exit speed.
  • the film obtained had the following properties:
  • the exit speed was 4.2 m / min and the film was removed at the same speed. This means that the flat film was not stretched in the longitudinal direction.
  • the film obtained had the following properties:
  • Thickness 80.0 ⁇ m
  • the exit speed was 25.0 m / min and the film was pulled off at three times the speed.
  • the film obtained had the following properties:
  • Thickness 15.0 ⁇ m
  • the exit speed was 2.5 m / min and the film was removed at 2.2 times the speed.
  • the film obtained had the following properties:
  • Thickness 135.0 ⁇ m
  • the exit speed was 5.0 m / min and the film was pulled off at 2.9 times the speed.
  • the film obtained had the following properties:
  • Thickness .85.0 ⁇ m
  • the exit speed was 5.0 m / min, and the film was drawn off at 3 times the speed and stretched in the coagulation bath by 50% in the direction of its width (cross-stretched).
  • the film obtained had the following properties:
  • Thickness 33.0 ⁇ m
  • the exit speed was 4.2 m / min and the film was removed at the same speed. This means that the flat film was not stretched in the longitudinal direction in the air gap. However, the film was stretched in the air gap in the direction of its width by 10% (cross-stretched).
  • the film obtained had the following properties:
  • Thickness 95.0 ⁇ m
  • the exit speed was 5.0 m / min and the film was removed at the same speed.
  • the film obtained had the following properties:
  • the film obtained had the following properties:
  • Example 2 The procedure was analogous to Example 1, but the temperature of the cellulose solution used was 110 ° C. and consisted of 13.8 mass% cellulose, 76.4 mass% NMMO and 9.8 mass% water, the extrusion gap of the flat die used being one length of 40 cm and a width of 500 microns and the throughput 75.6 kg / h betmg and the precipitation bath consisted of 98 mass% water and 2 mass% NMMO.
  • the exit speed was 5.0 m / min and the film was removed at the same speed. After the precipitation bath, the film was stretched by 54% in its width direction (cross-stretched).
  • the film obtained had the following properties:
  • Thickness 68.0 ⁇ m
  • the film obtained had the following properties:
  • Thickness 28.0 ⁇ m
  • the exit speed was 5.0 m / min and the film was removed at the same speed. After the precipitation bath, the film was stretched (cross-stretched) by 100% in its width direction.
  • the film obtained had the following properties:
  • Thickness 45.0 ⁇ m
  • the exit speed was 5.0 m / min and the film was removed at 3 times this speed. After the precipitation bath, the film was stretched by 100% in its width direction (cross-stretched).
  • the film obtained had the following properties:
  • the cellulose solution formed as a flat film emerged from the nozzle at an exit speed of 6.3 m / min and was drawn off at the same speed. This means that the flat film was not stretched in the longitudinal direction in the air gap.
  • the film obtained had the following properties:
  • the cellulose solution formed as a flat film emerged from the nozzle at an outlet speed of 4.2 m / min and was drawn off at 3 times this speed.
  • the film obtained had the following properties:
  • a film was produced analogously to Example 18. This film was dried by means of a drum dryer, whereby it was pressed at the edges by moving belts onto the drum of the dryer and was thereby prevented from shrinking as a result of the drying.
  • the dried film obtained had the following properties:
  • Thickness 29.3 ⁇ m
  • the cellulose solution formed as a flat film emerged from the nozzle at an exit speed of 8.3 m / min and was drawn off at the same speed.
  • the film obtained had the following properties:
  • Thickness 89.0 ⁇ m
  • the breadth of shrinkage in this case is 25%.
  • the film obtained had the following properties:
  • Thickness 85.0 ⁇ m
  • the width shrinkage in this case is 33%.
  • a cellulose solution with a temperature of 110 ° C. containing 14.2% by mass of cellulose, 76.3% by mass of NMMO and 9.5% by weight of water was produced using a flat die which had an extraction gap with a length of 40 cm and a width of 500 ⁇ m exhibited with one Throughput of 75.6 kg / h extruded vertically downwards through an air gap of 1 cm into a precipitation bath consisting of 98 mass% water and 2 mass% NMMO.
  • the cellulose solution formed as a flat film emerged from the nozzle at an exit speed of 5.0 m / min and was drawn off at a rate which was 10 times this speed.
  • the film obtained had the following properties:
  • Thickness 5.0 ⁇ m
  • the procedure was analogous to Example 22, but the cellulose solution had 14.6% by mass of cellulose, 76.1% by mass of NMMO and 9.3% by weight of water and the flat die had an extraction gap with a length of 6 cm.
  • the film obtained had the following properties:
  • Thickness 5.0 ⁇ m
  • the exit speed of the cellulose solution formed as a flat film was 4.2 m / min, and the film was drawn off at the same speed. This means that the film was not stretched in the longitudinal direction.
  • the film obtained had the following properties:
  • Thickness 70.0 ⁇ m
  • the film obtained had the following properties:
  • Thickness 73.0 ⁇ m

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de production de feuilles planes cellulosiques et de membranes cellulosiques sous forme de membranes planes, le dit procédé consistant à extruder une solution de cellulose dans un oxyde d'amine tertiaire aqueux, au moyen d'une filière d'extrusion présentant une fente d'extrusion allongée, ladite solution étant façonnée sous forme de feuille, puis à l'acheminer dans un bain de régénération par l'intermédiaire d'une fente d'aération. Ledit procédé est caractérisé en ce que l'on utilise une filière d'extrusion présentant une fente d'extrusion d'une longueur d'au moins 40 cm.
EP98916619A 1997-04-25 1998-04-24 Procede de production de corps moules cellulosiques Withdrawn EP0977802A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT70597 1997-04-25
AT0070597A AT404731B (de) 1997-04-25 1997-04-25 Verfahren zur herstellung cellulosischer flachfolien und ihre verwendung
PCT/AT1998/000108 WO1998049223A1 (fr) 1997-04-25 1998-04-24 Procede de production de corps moules cellulosiques

Publications (1)

Publication Number Publication Date
EP0977802A1 true EP0977802A1 (fr) 2000-02-09

Family

ID=3497635

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98916619A Withdrawn EP0977802A1 (fr) 1997-04-25 1998-04-24 Procede de production de corps moules cellulosiques

Country Status (5)

Country Link
US (1) US6177035B1 (fr)
EP (1) EP0977802A1 (fr)
AT (1) AT404731B (fr)
AU (1) AU7012498A (fr)
WO (1) WO1998049223A1 (fr)

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US6235392B1 (en) 1996-08-23 2001-05-22 Weyerhaeuser Company Lyocell fibers and process for their preparation
US6221487B1 (en) 1996-08-23 2001-04-24 The Weyerhauser Company Lyocell fibers having enhanced CV properties
BR9804868A (pt) * 1997-04-25 1999-08-24 Chemiefaser Lenzing Ag Processo para produ-Æo de corpos moldados de celulose
AT406958B (de) * 1998-10-22 2000-11-27 Chemiefaser Lenzing Ag Verfahren zur herstellung cellulosischer flachfolien
GB0020852D0 (en) * 2000-08-24 2000-10-11 Ucb Sa Cellulosic films and uses thereof
AT410668B (de) * 2001-06-12 2003-06-25 Ucb Sa Verfahren zur herstellung von cellulosischen flachfolien
WO2002100926A1 (fr) * 2001-06-12 2002-12-19 Ucb S.A. Procede de production de films cellulosiques plans
DE10261496A1 (de) * 2002-12-23 2004-07-01 Kalle Gmbh & Co. Kg Eßbare Flachfolie
DE102006033591B4 (de) * 2006-07-18 2008-10-16 Thüringisches Institut für Textil- und Kunststoff-Forschung e.V. Verfahren zur Stabilisierung der Spinnlösung bei der Herstellung von cellulosischen Verbundformkörpern
US20120201995A1 (en) * 2009-09-30 2012-08-09 Melle Juergen Moulded body having cladding material and carrier material and method for the production thereof

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US6177035B1 (en) 2001-01-23
ATA70597A (de) 1998-06-15
AT404731B (de) 1999-02-25
AU7012498A (en) 1998-11-24
WO1998049223A1 (fr) 1998-11-05

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