EP0229172A4 - Sheath core fiber and its method of manufacture. - Google Patents

Sheath core fiber and its method of manufacture.

Info

Publication number
EP0229172A4
EP0229172A4 EP19860904673 EP86904673A EP0229172A4 EP 0229172 A4 EP0229172 A4 EP 0229172A4 EP 19860904673 EP19860904673 EP 19860904673 EP 86904673 A EP86904673 A EP 86904673A EP 0229172 A4 EP0229172 A4 EP 0229172A4
Authority
EP
European Patent Office
Prior art keywords
sheath
core
fiber
group
core fiber
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
EP19860904673
Other languages
German (de)
French (fr)
Other versions
EP0229172A1 (en
EP0229172B1 (en
Inventor
John R Collier
Billie J Collier
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.)
Ohio University
Ohio State University
Original Assignee
Ohio University
Ohio State University
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 Ohio University, Ohio State University filed Critical Ohio University
Priority to AT86904673T priority Critical patent/ATE75788T1/en
Publication of EP0229172A1 publication Critical patent/EP0229172A1/en
Publication of EP0229172A4 publication Critical patent/EP0229172A4/en
Application granted granted Critical
Publication of EP0229172B1 publication Critical patent/EP0229172B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/02—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from cellulose, cellulose derivatives, or proteins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof

Definitions

  • Coextrusion of two different materials to form a side-by-side bicomponent fiber has been done extensively, primarily to develop a crimped product.
  • U.S. Patent No. 2,439,813, Kulp discloses such a product, where both components are viscose of different contractivity due to different aging times and different concentrations of cellulose, carbon disulfide, or sodium hydroxide.
  • Sheath core structures have also been formed, again usually for crimping purposes.
  • U.S. Patent No. 3,458,615, Bragaw discloses a coextrusion of two streams in the molten state and any orientation to be developed will be induced downstream from the die.
  • the Bragaw patent is directed to the production of light guides where a well controlled smooth interface is critical to maintaining internal reflection of the light passing through the core and reflected off the surface.
  • U.S. Patent No. 2,932,079, Dietzch discloses a sheath core structure which must contain at least two cores of different materials and a
  • U.S. Patent No. 2,989,798, Bannerman is also involved in the production of a sheath core fiber in which both layers are polyamides.
  • the core polyamide is hosen or modified to be more dye receptive.
  • U.S. Patent No. 2,063,180, Meyer involves a coextrusion process in which an inner stream consisting of a volatile solvent carrying a coloring substance passes through a wick and is subsequently covered by a viscose solution. During spinning the volatile solvent diffuses through the forming rayon leaving behind only the coloring substance.
  • the inner core would not exist as a discrete region since the dye would form a gradient into the rayon.
  • the invention involves creation of a sheath core fiber comprising an inner core of an oriented thermoplastic material, such as nylon, polyester, acrylic, and olefin, and any other oriented thermoplastic material, and a sheath made of a nonthermoplastic material, such as rayon, or regenerated protein and any other appropriate nonthermoplastic material.
  • an oriented thermoplastic material such as nylon, polyester, acrylic, and olefin, and any other oriented thermoplastic material
  • a sheath made of a nonthermoplastic material, such as rayon, or regenerated protein and any other appropriate nonthermoplastic material.
  • FIG. 1 is a schematic diagram of the method of producing the fiber of this invention.
  • Fig. 2 is a perspective view of a single fiber.
  • Fig. 3 is a scanning electron micrograph of a fiber produced by this invention at a magnification of 1250X.
  • the core material 10 is introduced into the chamber 11, which is provided with a die 12 at its lower end.
  • ⁇ U9STITUTE SHEET material is introduced through member 13 by gravity or pressure flow into the chamber 11.
  • the fiber solution contact region is designed to be sufficient to insure that the core 10 is thoroughly coated with the sheath- forming material prior to entering the die 12.
  • the relative amount of solution coated onto the core fiber is controlled by die opening geometry, solution rheological properties, and drag and pressure driven flow.
  • the combined sheath core fiber 14 exits the die 12 and enters the acid bath 15 where the sheath material is coagulated.
  • Fig. 2 is a scanning electron micrograph of the sheath core fiber shown in Fig. 2 at a magnification of 1250x, reveals dimples that are not elongated indicating lack of orientation of the surface and the enhanced surface area. Both of these properties contribute high sorptivity and thus comfort and dyeability.
  • the core fiber was nylon 66 and was 20 microns in diameter.
  • the die opening was approximately 800 microns and the resultant rayon skin thickness was one micron.
  • the line speed of 100 feet per minute was used with a commercial concentration spinning bath consisting of nine weight percent sulfuric acid and 13 weight percent of sodium sulfate. Much higher line speeds, of course, can be used and different die openings and/or a higher pressure head may also be used.
  • the resulting fibers maintain essentially the bulk mechanical properties of the nylon core and have the dyeability of rayon.
  • rayon fibers typically are formed from a solution containing about seven percent cellulose in a sodium xanthate form and seven percent alkali. An acceptable viscosity for spinning is achieved by ripening the viscose solution for four to five days. The fibers are formed by extruding thin filaments of this solution from a spinning bath in which the cellulose is regenerated from its xanthate form and coagulated. This is performed under tension and orientation develops in the rayon fiber, the level of which is controlled by the tension, cellulose source and character, and the spinning bath concentration and temperature.
  • the sheath material since the core material carries the tensile load, the sheath material develops very low, if any, orientation, as opposed to normal rayon fibers that are spun under tension to develop strength relating to orientation. This enables surface dimpling which results in an enhanced surface area contributing to higher sorptivity and greater dyeability. Furthermore, since the core material carries the tensile load, the acid bath, as shown ' in Fig. 1, can be spaced from the face of the die and thus precious metal faced dies are not needed in practicing this invention. In addition, since this process does not require the viscose solution to be able to be drawn into a fiber, a broader class of viscose solutions may be used.
  • core material 10 has been shown as a single monofilament, it should be kept in mind that, contemplated within the scope of this invention are multiple filament bundles, such as yarns, which may also be used as core material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Multicomponent Fibers (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Materials For Medical Uses (AREA)

Abstract

A sheath core fiber having an inner core (10) made from an oriented thermoplastic material, such as polyester, nylon, acrylic, and olefin, and a sheath (18) made of a nonthermoplastic material, such as regenerated cellulose and protein. The fiber maintains the crease and tear resistance of the core material, yet has the water sorptivity and dyeability of the sheath material. A method of manufacturing such a fiber is also disclosed.

Description

SHEATH CORE FIBER AND ITS METHOD OF MANUFACTURE BACKGROUND OF THE INVENTION .The desirability of combining the optimum characteristics of oriented thermoplastic materials, such as maintenance of crease and tear resistance, with the dyeability and sorptivity of natural materials has been recognized for some time. Attempts in this direction have usually resulted in blending the two materials together so that there is an averaging of the properties of the materials rather than an optimization of each of the component's most desirable properties.
Coextrusion of two different materials to form a side-by-side bicomponent fiber has been done extensively, primarily to develop a crimped product. For example, U.S. Patent No. 2,439,813, Kulp, discloses such a product, where both components are viscose of different contractivity due to different aging times and different concentrations of cellulose, carbon disulfide, or sodium hydroxide. Sheath core structures have also been formed, again usually for crimping purposes. For example, U.S. Patent No. 3,458,615, Bragaw, discloses a coextrusion of two streams in the molten state and any orientation to be developed will be induced downstream from the die. The Bragaw patent is directed to the production of light guides where a well controlled smooth interface is critical to maintaining internal reflection of the light passing through the core and reflected off the surface. U.S. Patent No. 2,932,079, Dietzch, discloses a sheath core structure which must contain at least two cores of different materials and a
SU sheath of a third material. This is so that crimp may be developed by differential thermal contraction of non- concentric core and sheath layers. U.S. Patent No. 2,989,798, Bannerman, is also involved in the production of a sheath core fiber in which both layers are polyamides. The core polyamide is hosen or modified to be more dye receptive. U.S. Patent No. 2,063,180, Meyer, involves a coextrusion process in which an inner stream consisting of a volatile solvent carrying a coloring substance passes through a wick and is subsequently covered by a viscose solution. During spinning the volatile solvent diffuses through the forming rayon leaving behind only the coloring substance. The inner core would not exist as a discrete region since the dye would form a gradient into the rayon.
Other prior, art references in this area, which are known to applicant, are set forth in the attached Information Disclosure Statement. SUMMARY OF THE INVENTION "
The invention involves creation of a sheath core fiber comprising an inner core of an oriented thermoplastic material, such as nylon, polyester, acrylic, and olefin, and any other oriented thermoplastic material, and a sheath made of a nonthermoplastic material, such as rayon, or regenerated protein and any other appropriate nonthermoplastic material.
Also set forth is a method of making such a fiber wherein the core fiber is drawn through the liquid sheath-forming material and thence through a die. Because the core fiber is already oriented and in solid form, there is a very low tensile load on the sheath material and thus it will not develop significant crystal orientation during the drawing process, as would be the case if it alone were being drawn from the die. This results in the production of a sheath material
SUBSTITUTE SWEET which is not oriented and, consequently, has increased sorptivity and dyeability. Yet, because the core material constitutes the major cross section of the fiber, it will maintain the strength and crease and tear resistance which are characteristic of the core material. In producing this fiber, because of the tensile strength of the existing inner core structure, it is not necessary to coagulate the sheath material immediately as it exits from the die. Thus the die face does not have to be in contact with the acid bath as is the case of a viscose fiber being drawn from a die. This lessens the necessity of having the die face con¬ structed of precious metal and significantly simplifies and reduces the cost of manufacturing the product. it is therefore an object of this invention to provide a sheath core fiber combining the most desirable characteristics of the core, coupled with the most desirable characteristics of the sheath.
It is also an object of this invention to provide a method of making such a product.
These, together with other objects and advantages of the invention, will become apparent from the following detailed description of the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of the method of producing the fiber of this invention.
Fig. 2 is a perspective view of a single fiber.
Fig. 3 is a scanning electron micrograph of a fiber produced by this invention at a magnification of 1250X.
DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawings, and particularly to Fig. 1, in the method of making the fiber of this invention, the core material 10 is introduced into the chamber 11, which is provided with a die 12 at its lower end. The liquid sheath-forming
§U9STITUTE SHEET material is introduced through member 13 by gravity or pressure flow into the chamber 11. The fiber solution contact region is designed to be sufficient to insure that the core 10 is thoroughly coated with the sheath- forming material prior to entering the die 12. The relative amount of solution coated onto the core fiber is controlled by die opening geometry, solution rheological properties, and drag and pressure driven flow. The combined sheath core fiber 14 exits the die 12 and enters the acid bath 15 where the sheath material is coagulated. The sheath core fiber 14 exits the acid bath 15, is rinsed with a water rinse 16, and is then collected on take-up roll 17.
Referring now more particularly to Fig. 2, the core material 10 is shown with the sheath material 18 surrounding the core material. Satisfactory fibers where the core 10 is 20 microns in diameter and the sheath material 18 is one micron in thickness have been produced. Thicker sheath layers have also been produced by increasing the pressure imposed in member 13. Fig. 3, which is a scanning electron micrograph of the sheath core fiber shown in Fig. 2 at a magnification of 1250x, reveals dimples that are not elongated indicating lack of orientation of the surface and the enhanced surface area. Both of these properties contribute high sorptivity and thus comfort and dyeability. The method of producing such a fiber is described in detail in the following example which involves nylon 66 for the core and viscose rayon for the sheath. While the invention is described with respect to these two materials, and this is a preferred combination, it must be kept in mind that other core materials and other sheath materials are contemplated within the scope of this invention. EXAMPLE 1
An already oriented nylon fiber was passed through a commercial viscose rayon solution and then
SUBS' * ''■ - -- drawn through a die. The core fiber was nylon 66 and was 20 microns in diameter. The die opening was approximately 800 microns and the resultant rayon skin thickness was one micron. The line speed of 100 feet per minute was used with a commercial concentration spinning bath consisting of nine weight percent sulfuric acid and 13 weight percent of sodium sulfate. Much higher line speeds, of course, can be used and different die openings and/or a higher pressure head may also be used. The resulting fibers maintain essentially the bulk mechanical properties of the nylon core and have the dyeability of rayon.
Commercial rayon fibers typically are formed from a solution containing about seven percent cellulose in a sodium xanthate form and seven percent alkali. An acceptable viscosity for spinning is achieved by ripening the viscose solution for four to five days. The fibers are formed by extruding thin filaments of this solution from a spinning bath in which the cellulose is regenerated from its xanthate form and coagulated. This is performed under tension and orientation develops in the rayon fiber, the level of which is controlled by the tension, cellulose source and character, and the spinning bath concentration and temperature.
In the instant invention, since the core material carries the tensile load, the sheath material develops very low, if any, orientation, as opposed to normal rayon fibers that are spun under tension to develop strength relating to orientation. This enables surface dimpling which results in an enhanced surface area contributing to higher sorptivity and greater dyeability. Furthermore, since the core material carries the tensile load, the acid bath, as shown 'in Fig. 1, can be spaced from the face of the die and thus precious metal faced dies are not needed in practicing this invention. In addition, since this process does not require the viscose solution to be able to be drawn into a fiber, a broader class of viscose solutions may be used.
While the core material 10 has been shown as a single monofilament, it should be kept in mind that, contemplated within the scope of this invention are multiple filament bundles, such as yarns, which may also be used as core material.
While this invention has been described in its preferred embodiment, it is appreciated that slight variations may be made without departing from the true scope and spirit of the invention.
SUBSTIT ■

Claims

C I M S
1. A sheath core fiber comprising an inner core of an oriented thermoplastic material and a sheath made of a nonthermoplastic material.
2. The article of claim 1, wherein the inner core is made of a material selected from the group consisting of polyesters, nylons, acrylics, and olefins.
3. The article of claim 1, wherein the sheath is made of a material selected from the group consisting of regenerated cellulose and regenerated protein.
4. The article of claim 2, wherein the sheath is made of a material selected from the group consisting of regenerated cellulose and regenerated protein.
5. The method of making a sheath core fiber comprising drawing the core through the sheath forming material in liquid form, thence drawing said core through a die so that the desired thickness of sheath forming material remains on said core, drawing said thus coated core through an acid bath to coagulate the sheath material on said core, and rinsing said resulting sheath core fiber with water.
6. The method of claim 5, wherein said core is made of a material selected from the group consisting of polyesters, nylons, acrylics, and olefins.
7. The method of claim 5, wherein said sheath forming material is selected from the group consisting of regenerated cellulose and regenerated protein.
8. The method of claim 6, wherein said sheath forming material is selected from the group consisting of regenerated cellulose and regenerated protein.
TE SHEET
EP86904673A 1985-07-12 1986-07-08 Sheath core fiber and its method of manufacture Expired - Lifetime EP0229172B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86904673T ATE75788T1 (en) 1985-07-12 1986-07-08 CORE AND SHADE FIBER AND PRODUCTION THEREOF.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US75432785A 1985-07-12 1985-07-12
US754327 1985-07-12

Publications (3)

Publication Number Publication Date
EP0229172A1 EP0229172A1 (en) 1987-07-22
EP0229172A4 true EP0229172A4 (en) 1989-01-26
EP0229172B1 EP0229172B1 (en) 1992-05-06

Family

ID=25034319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86904673A Expired - Lifetime EP0229172B1 (en) 1985-07-12 1986-07-08 Sheath core fiber and its method of manufacture

Country Status (6)

Country Link
EP (1) EP0229172B1 (en)
JP (1) JPS63500109A (en)
KR (1) KR930012186B1 (en)
AT (1) ATE75788T1 (en)
DE (1) DE3685208D1 (en)
WO (1) WO1987000561A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223853A1 (en) * 1992-07-20 1994-01-27 Gerd Ebert Sewing thread, process for the production of tear-resistant chain stitch seams and chain stitch seam
CZ287297A3 (en) 1995-03-14 1998-02-18 Kimberly-Clark Worldwide, Inc. Wettable article
GB2324064A (en) * 1997-04-11 1998-10-14 Courtaulds Fibres Modified lyocell fibre and method of its formation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764954A (en) * 1952-02-27 1957-01-02 Raduner & Company A G A process for dyeing or printing fibrous material of a thermoplastic synthetic resin
DE1174291B (en) * 1963-04-04 1964-07-23 Rhodiaceta Ag Process for coating yarns, woven and knitted fabrics made from polyamides with cellulose

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2312469A (en) * 1941-05-14 1943-03-02 Du Pont Sized synthetic linear polyamide yarn
JPS491241B1 (en) * 1969-10-24 1974-01-12
US4382111A (en) * 1980-05-07 1983-05-03 Meisei Chemical Works Co., Ltd. Method of treating fiber
IT1151747B (en) * 1982-04-27 1986-12-24 Montedison Spa TWO-COMPONENT SYNTHETIC FIBERS SUITABLE TO REPLACE CELULOSIC FIBERS IN PAPER AND EXTRA-PAPER FIELDS, AND PROCEDURE FOR THEIR PREPARATION

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB764954A (en) * 1952-02-27 1957-01-02 Raduner & Company A G A process for dyeing or printing fibrous material of a thermoplastic synthetic resin
DE1174291B (en) * 1963-04-04 1964-07-23 Rhodiaceta Ag Process for coating yarns, woven and knitted fabrics made from polyamides with cellulose

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8700561A1 *

Also Published As

Publication number Publication date
JPS63500109A (en) 1988-01-14
EP0229172A1 (en) 1987-07-22
DE3685208D1 (en) 1992-06-11
WO1987000561A1 (en) 1987-01-29
KR930012186B1 (en) 1993-12-24
EP0229172B1 (en) 1992-05-06
ATE75788T1 (en) 1992-05-15
KR880700108A (en) 1988-02-15

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