EP0218934A2 - Procédé de nettoyage de boyaux synthétiques en cellulose régénérée - Google Patents

Procédé de nettoyage de boyaux synthétiques en cellulose régénérée Download PDF

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Publication number
EP0218934A2
EP0218934A2 EP86112752A EP86112752A EP0218934A2 EP 0218934 A2 EP0218934 A2 EP 0218934A2 EP 86112752 A EP86112752 A EP 86112752A EP 86112752 A EP86112752 A EP 86112752A EP 0218934 A2 EP0218934 A2 EP 0218934A2
Authority
EP
European Patent Office
Prior art keywords
washing
regenerated cellulose
cellulose
elements
deflection
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.)
Granted
Application number
EP86112752A
Other languages
German (de)
English (en)
Other versions
EP0218934B1 (fr
EP0218934A3 (en
Inventor
Hans-Gert Kirchner
Bernd Dr. Wahle
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.)
Dow Produktions und Vertriebs GmbH and Co oHG
Original Assignee
Wolff Walsrode 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 Wolff Walsrode AG filed Critical Wolff Walsrode AG
Publication of EP0218934A2 publication Critical patent/EP0218934A2/fr
Publication of EP0218934A3 publication Critical patent/EP0218934A3/de
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Publication of EP0218934B1 publication Critical patent/EP0218934B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L1/00—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
    • D06L1/12—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
    • D06L1/20—Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents combined with mechanical means

Definitions

  • the invention relates to a method for faster cleaning of products made from regenerated cellulose, in which the product to be cleaned passes through at least one washing segment, where it is first expressed with the aid of squeezing elements and then washed out via deflection elements with the washing medium flowing in countercurrent.
  • the coagulation of cellulose xanthate which is caused by the neutralization of the sodium hydroxide solution by sulfuric acid, also follows formation of cellulose by acid hydrolysis (regenerated cellulose).
  • acid hydrolysis regenerated cellulose
  • noticeable amounts of salts, in particular sodium sulfate which remain together with the regenerating agent sulfuric acid and constituents of the precipitation bath in the cellulose and must be removed by subsequent washing.
  • regenerated cellulose products are either in a vertical arrangement (vertical wash), in which the up and down continuous material webs are sprayed with water at the top, with salt and acid-laden water flowing out at the lower deflection points or in horizontal wash baths (tub washing), which often are arranged one above the other in several floors, washed out with water in countercurrent.
  • vertical wash in which the up and down continuous material webs are sprayed with water at the top, with salt and acid-laden water flowing out at the lower deflection points or in horizontal wash baths (tub washing), which often are arranged one above the other in several floors, washed out with water in countercurrent.
  • the aim of the present invention was therefore to provide a more efficient washing-out process for regenerated cellulose products in order to ultimately increase the production speed.
  • the present invention therefore relates to a process for cleaning products made from regenerated cellulose, preferably cellophane films or synthetic casings, which is characterized in that the regenerated cellulose product is passed through at least one washing segment, where it is first squeezed out with the aid of a squeezing element and then with simultaneous deflection is washed out via deflection elements with the washing water conducted in countercurrent.
  • washing segments should be run through, wherein the individual washing segments can be combined in a common container or each can be lined up one behind the other or one above the other.
  • each of these washing segments (6) should have a Squeeze element (1) must be equipped, the line pressure can be adjusted with the usual methods (hydraulics, spring pressure, etc.).
  • the squeezing element should preferably consist of a pair of rollers, at least one of the rollers should have an elastic coating. It is therefore expedient to choose a combination of an upper hard roller and a lower rubber-coated roller, for example a combination of an upper roller made of stainless steel and a lower roller with a hard rubber coating of medium Shore hardness.
  • Each washing segment (6) has at least one deflecting element (2), preferably a deflecting roller, the residence time of the product to be washed out being increased with the number of deflecting elements.
  • the washing water (7) is conducted in counterflow to the direction of the product (3) to be washed out. In the case of a common container for the individual washing segments, this is ensured by flow guide plates (5).
  • the squeezing elements (1) can also be equipped with fresh water nozzles (4) on the inlet side, which flush away the heavily salt-laden water escaping during squeezing, some of which runs off on the product (3).
  • line pressures of 1 to 1,000 N per cm should be used during the squeezing process.
  • the dwell time between successive squeeze elements should be set so that the absorbent product by absorbing fresh water reaches a high degree of swelling.
  • the dwell time can be controlled by the machine speed, but also by the number of deflecting elements, preferably deflecting rollers, and the dimension of the washing segments.
  • the suction speed of the material is known to be influenced by the temperature of the wash water.
  • line pressures of 100 to 500 N per cm are preferred. Due to the high absorbency of these materials, relatively short residence times of less than 10 seconds can be sufficient to achieve the maximum possible water absorption.
  • the cleaning method according to the invention makes it possible to achieve washing-out degrees which are superior to those of the prior art, with a considerable reduction in the size of the system, water and energy. It is also possible to significantly increase the production speed.
  • cellulose tubes are cleaned, which are known to be produced by coating a fiber paper formed into a tube with viscose and subsequent coagulation and regeneration in a precipitation bath with a high salt and acid content.
  • the washing segments used in the examples each have three deflection rollers, a base area of 50 ⁇ 50 cm and a height of 75 cm, measured between the lower deflection roller and squeeze rollers.
  • the synthetic intestine emerging from the pre-cleaning trough made of regenerated cellulose with a load of 0.5 to 0.7 g salt per g cellulose is pressed off with the first squeezing rollers at a line pressure of 120 N / cm and passes through at a speed of 7.5 m / min five washing segments with a total washing distance of 12.5 m.
  • the water temperature is 40 ° C, the throughput 25 l / min.
  • the artificial intestine has a residual salt content of on average ⁇ 0.001 g of salt per g of cellulose, determined as the residue that can still be removed with water.
  • Example 1 an artificial intestine made of regenerated cellulose with a salt load of 0.8 to 1 g salt per g cellulose is cleaned in five washing segments at a speed of 10 m / min.
  • the residual salt content after cleaning is 0.002 g salt per g cellulose.
  • an artificial intestine made of regenerated cellulose is cleaned, the water throughput being increased to 60 l / min.
  • the residual salt content averages 0.0015 g salt per g cellulose.
  • Example 3 an intestine with a salt load of 1.2 to 1.4 g of salt per g of cellulose is cleaned at a speed of 15 m / min in seven washing segments corresponding to a total washing distance of 17.5 m.
  • the average residual salt content is 0.0025 g of salt per g of artificial casing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Artificial Filaments (AREA)
  • Paper (AREA)
EP86112752A 1985-10-12 1986-09-16 Procédé de nettoyage de boyaux synthétiques en cellulose régénérée Expired - Lifetime EP0218934B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853536537 DE3536537A1 (de) 1985-10-12 1985-10-12 Verfahren zur reinigung von produkten aus regenerierter cellulose
DE3536537 1985-10-12

Publications (3)

Publication Number Publication Date
EP0218934A2 true EP0218934A2 (fr) 1987-04-22
EP0218934A3 EP0218934A3 (en) 1988-09-14
EP0218934B1 EP0218934B1 (fr) 1990-03-21

Family

ID=6283497

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112752A Expired - Lifetime EP0218934B1 (fr) 1985-10-12 1986-09-16 Procédé de nettoyage de boyaux synthétiques en cellulose régénérée

Country Status (4)

Country Link
US (1) US4790044A (fr)
EP (1) EP0218934B1 (fr)
DE (2) DE3536537A1 (fr)
FI (1) FI864079A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000018991A1 (fr) * 1998-09-29 2000-04-06 Lenzing Aktiengesellschaft Procede de production de fibres cellulosiques

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5741529A (en) 1996-07-31 1998-04-21 Alfacel S.A. Adjustable reaction tubs for cellulose
US5736087A (en) * 1996-10-30 1998-04-07 Alfacel S.A. Method for finishing of sausage casings
CN114539800B (zh) * 2022-04-01 2023-08-04 浙江理工大学 一种高韧性高透明可热封纤维素膜的制备方法及应用

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972209A (en) * 1974-11-18 1976-08-03 Serkov Arkadij T Apparatus for washing yarn during movement thereof
FR2317410A1 (fr) * 1975-07-11 1977-02-04 Evsei Moiseevich Mogilevsky Procede de lavage, au cours de leur deplacement continu, de fils de viscose fraichement formes et dispositif pour la mise en oeuvre dudit procede

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2916767A (en) * 1956-12-07 1959-12-15 Du Pont Film casting apparatus including means to restrain transverse shrinkage of the film
US3857261A (en) * 1973-08-27 1974-12-31 Riggs & Lombard Inc Textile scouring range
DE2425374A1 (de) * 1974-05-25 1975-12-04 Artos Meier Windhorst Kg Verfahren und vorrichtung zur nassbehandlung, insbesondere zum waschen von laufenden warenbahnen
US4025304A (en) * 1974-09-14 1977-05-24 Vepa Ag Process for the wet treatment of tension-free guided material
US3889390A (en) * 1974-10-18 1975-06-17 Du Pont Regenerated cellulose softener recovery method and apparatus
JPS5274094A (en) * 1975-12-15 1977-06-21 Toyo Boseki Correct apparatus for loop size of fibre in continuous treat machine
US4372135A (en) * 1979-05-11 1983-02-08 Greenville Steel Textile Machinery Corporation Horizontal washer apparatus
US4520520A (en) * 1983-02-01 1985-06-04 Johnston Lawton L Mercerization process and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3972209A (en) * 1974-11-18 1976-08-03 Serkov Arkadij T Apparatus for washing yarn during movement thereof
FR2317410A1 (fr) * 1975-07-11 1977-02-04 Evsei Moiseevich Mogilevsky Procede de lavage, au cours de leur deplacement continu, de fils de viscose fraichement formes et dispositif pour la mise en oeuvre dudit procede

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Kurt Götze :"Chemiefasern nach dem Viskoseverfahren",2.Band,3.Aufl.,Springer Verlag (1967),S.881 bis 885 und 910 bis 913 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000018991A1 (fr) * 1998-09-29 2000-04-06 Lenzing Aktiengesellschaft Procede de production de fibres cellulosiques
US6645409B2 (en) 1998-09-29 2003-11-11 Lenzing Aktiengesellschaft Process for the production of cellulosic fibres

Also Published As

Publication number Publication date
FI864079A (fi) 1987-04-13
DE3536537A1 (de) 1987-04-16
DE3669741D1 (de) 1990-04-26
EP0218934B1 (fr) 1990-03-21
FI864079A0 (fi) 1986-10-09
US4790044A (en) 1988-12-13
EP0218934A3 (en) 1988-09-14

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