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EP0267489B1 - Procédé et dispositif pour appliquer et imprégner une étoffe de nappe de fibres avec des liquides visqueux - Google Patents

Procédé et dispositif pour appliquer et imprégner une étoffe de nappe de fibres avec des liquides visqueux Download PDF

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Publication number
EP0267489B1
EP0267489B1 EP87115755A EP87115755A EP0267489B1 EP 0267489 B1 EP0267489 B1 EP 0267489B1 EP 87115755 A EP87115755 A EP 87115755A EP 87115755 A EP87115755 A EP 87115755A EP 0267489 B1 EP0267489 B1 EP 0267489B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
viscose
nozzles
web
coating
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.)
Expired - Lifetime
Application number
EP87115755A
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German (de)
English (en)
Other versions
EP0267489A3 (en
EP0267489A2 (fr
Inventor
Klaus Dipl.-Ing. Basfeld
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 EP0267489A2 publication Critical patent/EP0267489A2/fr
Publication of EP0267489A3 publication Critical patent/EP0267489A3/de
Application granted granted Critical
Publication of EP0267489B1 publication Critical patent/EP0267489B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B1/00—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating
    • D06B1/08—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating from outlets being in, or almost in, contact with the textile material

Definitions

  • the invention relates to a method and a device for applying and impregnating nonwovens with viscous liquids.
  • Nonwoven fabric is to be understood in particular to mean a structure of an irregular structure in which there is a cavity structure distributed unevenly over the surface.
  • Such nonwovens can have natural as well as artificially produced fibers as base material, which are additionally stabilized by cross-linking.
  • Such structures are difficult to soak, especially if the embedding process is to take place very quickly and without the inclusion of air or gas.
  • Such a production stage exists, for example, in the production of fiber-reinforced cellulose casings, which are preferably made from a nonwoven web and viscose.
  • Cellulose casings are e.g. used in the packaging of food, in particular they are used as sausage casings. A distinction is made between one-sided and two-sided viscous casings depending on the type of viscose applied during manufacture.
  • the form which is viscose-coated on both sides, generally has better and more uniform embedding of the nonwoven fabric, provided that air pockets can be avoided on both sides of the nonwoven in the short time of applying the viscose. It is understandable that the targeted air displacement is easier to carry out with a one-sided coating, especially since after leaving the nozzle in which the coating is applied, there is still a free distance until the beginning of the precipitation, the one-sided displacement of the air from the fleece.
  • the cellulose casings in tubular form which are viscose on both sides and are customary today are generally produced by first forming a nonwoven web into a tubular. Viscose is applied to this tube from both sides in the coating device (GB-A-1336850). The viscose is applied almost simultaneously for reasons of the decreasing strength in the viscose wetting of the natural fiber fleece that is usually preferred.
  • nozzle systems are used, which consist of an outer and an inner ring nozzle. Via these ring nozzles the viscose is given under pressure Quantities applied. The impregnation of the fleece without the inclusion of air is difficult because it is a highly viscous aqueous liquid.
  • the viscosity of the viscose is essentially determined by the solids content of cellulose and the degree of polymerization. The higher the two values, the higher the viscosity. For the processing of the viscose, one would like a low viscosity in order to quickly and optimally soak the nonwoven fabric. However, the quality of the end product increases with a high solids content and degree of polymerization. The degree of polymerization determines the shrinkage behavior and the elasticity of the regenerated cellulose, the solids content the porosity and in connection with the degree of polymerization the final strength of the shell. This results in a compromise for the production, which is usually a solids content that is actually too low.
  • viscose is used with 6.5 to 7% by weight, i.e. a solid content that is not optimal.
  • the object of the present invention was to provide an improved device and an improved method, in particular for coating on both sides of nonwovens.
  • the invention relates to a device for applying and impregnating nonwovens with a viscous liquid with application nozzles, characterized in that on at least one On the web side A of the nonwoven fabric, at least 2 nozzles D1 and D3 are arranged offset in the conveying direction, the nozzle gaps 10 and 12 of which are separated from one another by a nozzle lip 19 and that, opposite this lip 19, a nozzle D2 for the counter-coating is arranged on a web side I of the nonwoven fabric,
  • web side A is the outer web side of the nonwoven.
  • the nozzles are preferably annular slot nozzles, the outlet opening of which is 0.3 to 6 mm wide.
  • the nozzles D1 and D3 are preferably offset from one another by approximately 2 mm to 8 mm,
  • the invention further relates to a method for the two-sided application and impregnation of nonwovens with a viscous liquid, at least two nozzles D1 and D3 applying the viscous liquid to at least one web side A.
  • Nozzle D3 is arranged offset in the conveying direction to nozzle D1; The fleece is thus coated first by the nozzle D1 and then only by the nozzle D3.
  • the counter-coating of the web side I is carried out with a nozzle D2, which is located opposite the nozzle lip common to the nozzles D1 and D3.
  • the application is carried out any area through the nozzle D2 approx. 0 to 2 x 10 ⁇ 2 seconds later than the order through the nozzle D1.
  • the viscous liquid emerges from the nozzle D3 at a higher pressure than from the nozzle D1.
  • the outlet pressure from the nozzle is regulated in such a way that the nonwoven web to be coated moves in the direction of the outlet of the coating device due to the staggered pressure build-up.
  • the solids content of the viscous liquid is preferably 7.5 to 9.0% by weight.
  • the viscous liquid may contain additives that improve the appearance and properties, e.g. Color pigments, adhesives or release agents, as well as substances that regulate the adhesive and reactive properties.
  • the manufacturing process for a cellulose casing according to the invention preferably proceeds as follows:
  • the web cut from nonwoven depending on the viscose tube diameter to be produced is formed into a tube with an overlap.
  • the hose is impregnated and coated on both sides with viscose.
  • After passing through an air gap the viscose-coated nonwoven tube into a precipitation bath, where the viscose is precipitated, while maintaining regenerated cellulose.
  • the regenerated cellulose is then washed, passed through a plasticizer bath and dried under supporting air.
  • the amount of water to be evaporated depends on the level of the solid content of cellulose in the viscose. Higher solids content means lower water content, which is another reason to be able to process high solids contents via the nozzle.
  • the coating according to the invention takes place in a cascade-like manner starting with an outer coating via an annular nozzle.
  • the distribution of the outer viscose systematically increases the pressure on the nonwoven, and the full pressure load is only reached when the coating device passes through at the end of the annular gap that exists between the nozzle bodies inside and outside to guide the nonwoven web.
  • the nonwoven is floated through the viscose and transported through the nozzle combination with an outflowing viscose without significant frictional stress.
  • the viscose distribution optimizes the increase in pressure on the nonwoven fabric so that a draft-free structure of the viscose goods is achieved even with thin nonwoven fabrics.
  • the viscosing process takes place in the device according to FIG. 1.
  • the nonwoven fabric formed into a tube runs over a cylindrical calibration mandrel 3.
  • the tube runs between an outer nozzle combination 1 and the assigned inner nozzle 2.
  • the outer combination consists of two individual nozzles 5 and 6.
  • the viscose is guided via a pump and inlet 7, not shown, into the annular chamber 9 of the nozzle 5, which is dimensioned such that a pressure loss to be neglected during Distributing the viscose occurs.
  • the viscose which is under pressure flows through a narrow nozzle gap 10 onto the nonwoven fabric.
  • the procedure for the second outer nozzle 6 via inlet 8, annular chamber 11 and nozzle gap 12 is similar. Viscoses with different properties can be fed in via inlet 7 and 8.
  • the inner nozzle 2 is fed via a viscose feed, not shown.
  • the viscose passes through the collecting space 15 into the nozzle gap 16, from there under pressure on the nonwoven fabric 4.
  • the nonwoven fabric 4 initially runs along the outer nozzle lip 18 and is exposed to viscose via the nozzle gap 10.
  • the pressure is generally such that the viscose does not rise in the 17 A annular gap.
  • the high viscosity leaves ventilation channels free.
  • the counteracting takes place via the inner nozzle gap 16. This embeds the fleece without excessive pressure.
  • the inner nozzle lip 21 ends under the nozzle gap 10 for optimal fleece support.
  • the pre-coated fleece runs into the pressure zone between nozzle lips 19 and 20.
  • the viscose flows over the nozzle ring gap 12. Since the highest pressure drop exists along the outer nozzle lip 20, the viscose is forced to exit via the annular gap 17 E. It thus moves the sensitive, now viscose-damped nonwoven fabric towards the nozzle outlet without stressing the nonwoven fabric.
  • the system of double loading from the outside and single coating via the inner nozzle described in the example is sufficient to build up the cascade-shaped viscose load with the wedge effect of the viscose pressure build-up.
  • the double action is preferably on the outside because these nozzles are more easily accessible for the viscose feed; it could of course also be inside.
  • the number of ring nozzles inside or outside can be an even or odd number.
  • a viscose produced according to customary methods is applied to a nonwoven fabric made of natural fibers with 21 g / m2 paper basis weight and 322 mm cutting width with the following data.
  • Solids content cellulose 7.7% by weight
  • Use of carbon disulfide 29% by weight on cellulose
  • Sodium hydroxide solution 5.7% by weight
  • Degree of polymerization 530
  • the viscosity of this viscose is 410 falling seconds at 20 ° C.
  • This viscose can only be processed to a limited extent with the usual viscous system at a production speed of 750 m / h. Sufficient soaking is not achieved in the overlap area of the seam; there are air pockets. There is a strong unevenness in the distribution of viscose on the nonwoven fabric due to excessive tensile forces or frictional forces in the nozzle. The finished product shows strongly fluctuating pressures.
  • Example 1 is repeated, but the viscose was applied according to the invention with a device according to FIG. 1.
  • the application speed was 750 m / h.
  • the cellulose tube was pressed open with water. It burst at overpressure of 0.69 bar.
  • the nonwoven embedding showed no air pockets.
  • the subsequent painting could be carried out better on the particularly flat surface than was the case with goods made with low-viscosity viscose and the usual nozzle system.
  • Example 2 is repeated with a cellulose casing made of non-woven fabric with 17 g / m2 paper basis weight and 200 mm cutting width. The same good results are obtained.
  • the cylindrical calibration mandrel 3 forms the support of the fleece tube until the viscose coating has ended.
  • About the A viscose is applied in accordance with Example 1 to nozzle D1. It additionally contains a coloring.
  • the same viscose is applied via nozzle D3.
  • a fiber fleece with a cutting width of 206 mm and a paper weight of 21 g / m2 is coated at a speed of 800 m / h. Total fleece embedding is achieved with perfect seam penetration. The regenerated cellulose layer is even without color streaks.
  • the viscosification is carried out with the substances and the same processing speed as in Example 4.
  • a conventional nozzle is used which has only one annular gap pressurized with viscose, through which the viscose reaches the nonwoven fabric.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Reinforced Plastic Materials (AREA)

Claims (8)

  1. Dispositif pour le revêtement et l'imprégnation de voiles avec des liquides visqueux au moyen de tuyères d'application, caractérisé en ce qu'il est prévu, sur au moins un côté A de la bande de voile, au moins 2 tuyères D1 et D3, décalées l'une par raport à l'autre dans le sens du transport, dont les fentes de tuyères 10 et 12 sont séparées l'une de l'autre par une lèvre de tuyère 19, et en ce qu'il est prévu, en face de cette lèvre 19, sur un côté I du voile, une tuyère D2 pour le revêtement opposé.
  2. Dispositif selon la revendication 1, caractérisé en ce que le côté A correspond à la face extérieure, et le côté I à la face intérieure.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les tuyères sont des tuyères annulaires à fente avec une ouverture de 0,3 à 6 mm.
  4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que les tuyères D1 et D3 sont décalées de 2 à 8 mm l'une par rapport à l'autre.
  5. Procédé pour le revêtement et l'imprégnation de voiles avec un liquide visqueux au moyen de tuyères, caractérisé en ce qu'on applique, sur au moins un côté A de la bande de voile, par au moins 2 tuyères, une tuyère D1 et une tuyère D3 décalée par rapport à la première dans le sens du transport, le liquide visqueux par les fentes de tuyères 10 et 12 séparées par une lèvre de tuyère 19, et que le côté de bande I opposé au côté de bande A est revêtu par une tuyère D2 disposée en face de la lèvre de tuyère 19.
  6. Procédé selon la revendication 5, caractérisé en ce que le liquide visqueux sort de la tuyère D3 avec une pression supérieure à la sortie de la tuyère D1.
  7. Procédé selon la revendication 5 ou 6,caractérisé en ce que la sortie du liquide visqueux des tuyères est réglée de manière telle que la bande de voile à traiter est déplacée en direction de la sortie du dispositif de revêtement.
  8. Procédé selon l'une des revendications 5 à 7, caractérisé en ce qu'on utilise de la viscose comme liquide visqueux.
EP87115755A 1986-11-08 1987-10-27 Procédé et dispositif pour appliquer et imprégner une étoffe de nappe de fibres avec des liquides visqueux Expired - Lifetime EP0267489B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3638189 1986-11-08
DE19863638189 DE3638189A1 (de) 1986-11-08 1986-11-08 Verfahren und vorrichtung zum auftragen und durchtraenken von vliesstoffen mit viskosen fluessigkeiten

Publications (3)

Publication Number Publication Date
EP0267489A2 EP0267489A2 (fr) 1988-05-18
EP0267489A3 EP0267489A3 (en) 1989-11-02
EP0267489B1 true EP0267489B1 (fr) 1992-12-02

Family

ID=6313526

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87115755A Expired - Lifetime EP0267489B1 (fr) 1986-11-08 1987-10-27 Procédé et dispositif pour appliquer et imprégner une étoffe de nappe de fibres avec des liquides visqueux

Country Status (5)

Country Link
US (1) US4808439A (fr)
EP (1) EP0267489B1 (fr)
JP (1) JP2563115B2 (fr)
DE (2) DE3638189A1 (fr)
FI (1) FI91783C (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3826616A1 (de) * 1988-08-05 1990-02-08 Hoechst Ag Textilverstaerkte schlauchfoermige verpackungshuelle auf basis von cellulose
US5407616A (en) * 1991-12-19 1995-04-18 E. I. Du Pont De Nemours And Company Method for making cylindrical preforms
US5514417A (en) * 1994-08-04 1996-05-07 Schuller International, Inc. Method of and apparatus for coating a molded fibrous workpiece
EP0790776B1 (fr) * 1994-11-14 2000-02-02 Wolff Walsrode Aktiengesellschaft Procede de production de tuyaux souples en viscose par precipitation

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224885A (en) * 1961-10-10 1965-12-21 Union Carbide Corp Method of producing cellulosic sausage casings
NL7018431A (fr) * 1969-12-27 1971-06-29
CH536181A (de) * 1971-03-23 1973-04-30 Aweta Anstalt Verfahren und Anlage zur Herstellung von textilarmierten Körpern
DE2365079A1 (de) * 1973-12-28 1975-07-03 Hoechst Ag Verfahren und vorrichtung zum impraegnieren oder beschichten von textilmaterialien
US4169186A (en) * 1978-04-17 1979-09-25 Asahi-Dow Limited Molding material structure
US4221756A (en) * 1978-09-15 1980-09-09 Western Electric Company, Incorporated Methods of enclosing a plurality of conductors in a partitioned jacket
US4390490A (en) * 1980-04-07 1983-06-28 Teepak, Inc. Fibrous casing extrusion
JPS584954U (ja) * 1981-07-01 1983-01-13 シャープ株式会社 やぐらこたつ
FR2577466B1 (fr) * 1985-02-21 1989-09-22 Ashimori Ind Co Ltd Materiau tubulaire de revetement a base de resines synthetiques, procede et appareil de fabrication
US4681722A (en) * 1985-10-07 1987-07-21 Owens-Corning Fiberglas Corporation Method of making a lineal structural member

Also Published As

Publication number Publication date
FI874894L (fi) 1988-05-09
JPS63126959A (ja) 1988-05-30
DE3782918D1 (de) 1993-01-14
EP0267489A3 (en) 1989-11-02
FI874894A0 (fi) 1987-11-05
FI91783C (fi) 1994-08-10
EP0267489A2 (fr) 1988-05-18
US4808439A (en) 1989-02-28
FI91783B (fi) 1994-04-29
DE3638189A1 (de) 1988-05-11
JP2563115B2 (ja) 1996-12-11

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