US3778873A - Process for the production of composite fibers, apparatus suitable to realize the same and fibers obtained thereby - Google Patents

Process for the production of composite fibers, apparatus suitable to realize the same and fibers obtained thereby Download PDF

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Publication number
US3778873A
US3778873A US00151860A US3778873DA US3778873A US 3778873 A US3778873 A US 3778873A US 00151860 A US00151860 A US 00151860A US 3778873D A US3778873D A US 3778873DA US 3778873 A US3778873 A US 3778873A
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US
United States
Prior art keywords
yarn
fibers
temperature
thermal shock
applying
Prior art date
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Expired - Lifetime
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US00151860A
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English (en)
Inventor
W Conti
P Corsini
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SnamProgetti SpA
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SnamProgetti SpA
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Publication date
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
    • D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
    • D01D10/04—Supporting filaments or the like during their treatment
    • D01D10/0436—Supporting filaments or the like during their treatment while in continuous movement
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
    • D01D5/30—Conjugate filaments; Spinnerette packs therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S57/00—Textiles: spinning, twisting, and twining
    • Y10S57/905—Bicomponent material

Definitions

  • a synthetic composite fiber is produced by a novel process and apparatus which includes drawing the yarn by air-suction and subjecting the yarn to a high temperature thermal shock to obtain a rigid wave or crimp in the fiber and thereafter applying a continuously high but decreasing temperature to obtain uniform crystallization of the fiber.
  • the present invention relates to a process for the production of composite fibers, to the apparatus suitable to realize the same and to the fiber article itself.
  • the present invention relates to a process for the production of composite fibers constituted by two polymers and/or copolymers, having different physical and/or chemical characteristics by means of which process said fibers acquire a helocoidal tridimensional configuration which gives the final manufactured fiber bulk and comfort; further the invention relates to the apparatus suitable to realize the process and to the fibers produced by the apparatus and process of the invention.
  • the suitable polymers may be different also exclusively in the molecular weight or in the crystallization velocity, the main difference consisting however in the different shortening of the two polymers constituting each filament when this is drawn and treated at suitable temperatures, higher than the ones the manufactured fiber is thereafter subjected to, namely the ones of dyeing, washing and the like.
  • the composite fibers leaving the spinneret plate are drawn and after drawing they have a potential for more than an actual crimping potential so that for developing all the crimping the yarns have to be subjected to a heat treatment commonly called (development).
  • development heat treatment
  • processes are known by which the (development) heat treatment produces a certain bulking effect.
  • the development is carried out under tension which is often feeble or weak, resulting in reduced and irregular crimping whereby the manufactured fibers present scarce bulk and above all are unsightly in appearance and contain dyeing flaws.
  • the bicomposed filament obtained by the known techniques contains an insufficiently rigid crimping so that, after knitting or weaving operations, because of the relative tensions present in such manufacturing operations due to the frictions among crossing of the threads, the bulk of the fiber in the finished cloth is even further lowered.
  • the thermal shock is a necessary feature for obtaining a sufficiently rigid wave or crimp. It is obvious that the tridimensional waviness must have reversals of the rotation direction, medium yarn twisting being zero; we have found that the higher the number of reversals of the rotation direction the higher the crimping stiffness. We have also found that the higher the thermal shock, the more frequent are reversals. Further, we have found that subsequent high temperature treatment allows the crystallinity to be made uniform, thereby avoiding dyeing flaws. By means of the aforesaid process a yarn is obtained having textile characteristics remarkably better than those of yarns obtained by the known art processes.
  • a further object of the present invention is the provision of apparatus by means of which the process object of the present invention may be carried out, which is illustrated in the accompanying drawing, FIG. 1.
  • the apparatus is comprised of bobbin 1 for collecting the yarn coming from the spinneret (not shown), a feeding calender 2, a stationary pin 3 heated at a temperature in the range of from 60C to 100C, preferably of about C, a stationary idle roll 4, a drawing godet 5, an electrically-charged ring 5a through which the yarn passes for separating the individual filaments of the yarn from one another, a pistol 6 working with air (Venturi) substantially in the form of an ejector (said pistol sucks the yarn through the system, thereby eliminating the drawbacks of entanglements present in conventional systems which make use of rolls, and further allows high (development) rates), an oven or other suitable heating device 7 wherein after a zone at a temperature ranging from 200C to 600C, preferably from 250C to 350C, (in said zone the thermal shock occurs
  • thermal shock is meant the sudden temperature rise to which the yarn is subjected at the oven entrance
  • the yarn at the oven entrance is substantially lower than the temperature of the first zone of the oven.
  • the yarn and the air at the entrance to the oven are at room temperature. The oven temperature after said first zone lowers naturally because of the natural emission of air at room temperature into the oven.
  • a further object of the present invention is a filament constituted by two polymers having a ratio by weight preferably of l/ l a number of waves per centimeter in the range of from 6 to 12, preferably of about 10, a rate of from 5 to 25 percent, preferably of about 10 percent, wherein the rate is defined by the following formula:
  • thermo shock is in the range of from 200C to 600C.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Artificial Filaments (AREA)
US00151860A 1970-06-10 1971-06-10 Process for the production of composite fibers, apparatus suitable to realize the same and fibers obtained thereby Expired - Lifetime US3778873A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2575170 1970-06-10

Publications (1)

Publication Number Publication Date
US3778873A true US3778873A (en) 1973-12-18

Family

ID=11217626

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Application Number Title Priority Date Filing Date
US00151860A Expired - Lifetime US3778873A (en) 1970-06-10 1971-06-10 Process for the production of composite fibers, apparatus suitable to realize the same and fibers obtained thereby

Country Status (10)

Country Link
US (1) US3778873A (enrdf_load_html_response)
BE (1) BE768266A (enrdf_load_html_response)
CA (1) CA939494A (enrdf_load_html_response)
DE (1) DE2128748A1 (enrdf_load_html_response)
ES (1) ES392464A1 (enrdf_load_html_response)
FR (1) FR2096054A5 (enrdf_load_html_response)
GB (1) GB1344491A (enrdf_load_html_response)
LU (1) LU63314A1 (enrdf_load_html_response)
NL (1) NL7107879A (enrdf_load_html_response)
TR (1) TR19031A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207730A (en) * 1977-12-30 1980-06-17 Palitex Project Company Gmbh Process and apparatus for bulking textile yarns

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069836A (en) * 1958-08-01 1962-12-25 Du Pont Yarn relaxation process using fluid jets
US3448501A (en) * 1966-05-16 1969-06-10 Rhone Poulenc Sa Process for the manufacture of a compacted yarn
US3551549A (en) * 1965-05-13 1970-12-29 Monsanto Co Stretching nylon filaments in a gas vortex
US3558760A (en) * 1965-06-18 1971-01-26 Du Pont Process for spinning two component polyamide filaments
US3655862A (en) * 1968-08-17 1972-04-11 Metallgesellschaft Ag Aspirator jet for drawing-off filaments

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069836A (en) * 1958-08-01 1962-12-25 Du Pont Yarn relaxation process using fluid jets
US3551549A (en) * 1965-05-13 1970-12-29 Monsanto Co Stretching nylon filaments in a gas vortex
US3558760A (en) * 1965-06-18 1971-01-26 Du Pont Process for spinning two component polyamide filaments
US3448501A (en) * 1966-05-16 1969-06-10 Rhone Poulenc Sa Process for the manufacture of a compacted yarn
US3655862A (en) * 1968-08-17 1972-04-11 Metallgesellschaft Ag Aspirator jet for drawing-off filaments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207730A (en) * 1977-12-30 1980-06-17 Palitex Project Company Gmbh Process and apparatus for bulking textile yarns

Also Published As

Publication number Publication date
ES392464A1 (es) 1973-08-16
BE768266A (fr) 1971-11-03
NL7107879A (enrdf_load_html_response) 1971-12-14
TR19031A (tr) 1978-02-06
GB1344491A (en) 1974-01-23
FR2096054A5 (enrdf_load_html_response) 1972-02-11
CA939494A (en) 1974-01-08
DE2128748A1 (de) 1971-12-16
LU63314A1 (enrdf_load_html_response) 1971-09-13

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