EP0283097A2 - Verfahren zur Herstellung eines Polyamid-6-Fadens - Google Patents

Verfahren zur Herstellung eines Polyamid-6-Fadens Download PDF

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Publication number
EP0283097A2
EP0283097A2 EP88200494A EP88200494A EP0283097A2 EP 0283097 A2 EP0283097 A2 EP 0283097A2 EP 88200494 A EP88200494 A EP 88200494A EP 88200494 A EP88200494 A EP 88200494A EP 0283097 A2 EP0283097 A2 EP 0283097A2
Authority
EP
European Patent Office
Prior art keywords
thread
process according
filaments
range
stretching
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Withdrawn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
EP88200494A
Other languages
English (en)
French (fr)
Other versions
EP0283097A3 (de
Inventor
Arturo Spani
Aldo Gentilucci
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.)
ENICHEM FIBRE S.P.A.
Original Assignee
ENICHEM FIBRE SpA
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 ENICHEM FIBRE SpA filed Critical ENICHEM FIBRE SpA
Publication of EP0283097A2 publication Critical patent/EP0283097A2/de
Publication of EP0283097A3 publication Critical patent/EP0283097A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • 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
    • D01D10/02—Heat treatment
    • 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
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • 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
    • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
    • D02J1/08—Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams

Definitions

  • the present invention relates to a continuous process for the production of an interlaced and stretched thread of polyamide-6.
  • stretched threads of polyamide 6, provided with good characteristics can be prepared by means of a process in which the spinning operations are distinct from the stretching operations, with said operations being carried out in two steps separate in space and in time, such as described, e.g., in Mark, Atlas, Cernia "Man Made Fibers; Science and Technology", 2nd Volume; 1968, page 255-foll.
  • the continuous, single-step processes show, as compared to the double-step processes, some advantages, in particular as regards the cheapness and the high production rates.
  • the purpose of the present invention is overcoming the above-mentioned drawbacks.
  • the purpose of the present invention is a simple and advantageous process which makes it possible stretched fibres of polyamide-6 to be continuously manufactured with good quality and uniform characteristics, by operating at a high speed, and under conditions of stability of the thread, and of the eventually obtained bobbins.
  • an interlaced thread of polyamide-6 can be stretched over not heated rolls, by operating at a high speed, and under conditions of perfect thread stablity. It was still found, according to the present invention, that it is possible to obtain a complete relaxation of the thread after the stretching, when said interlaced and stretched thread is submitted to a treatment with steam superheated at a relatively high temperature, by operating under conditions within which the structure of the same thread is not changed, or is not substantially changed.
  • the present invention is concerned with the production of an interlaced and stretched thread of polyamide-6, by means of a continuous process, which comprises the following steps, carried out in sequence:
  • the polyamide-6 useful for the purposes of the present invention has a value of the relative viscosity of from 2.55 to 2.65, when determined in sulphuric acid solvent at 95.7% by weight, with a polymer concentration of 1% by weight in the solution.
  • Such a polyamide-6 is molten, after drying (moisture content of the order of approximately 0.05% by weight), in a screw extruder, at a temperature of the order of 275°C, and is fed to the spinneret.
  • the spinneret is provided with bores of a diameter of from 0.20 to 0.35 mm.
  • the filaments exiting the die are heated, inside a cooling chamber, by means of an air stream at room temperature (20-25°C) and with controlled moisture values, delivered perpendicularly, or approximaterly perpendicularly relatively to the filaments.
  • the cooled filaments are collected in a bundle of filaments (the thread), while to them a finish liquid is applied. From 3 to 18 filaments, and preferably 10 filaments, may be combined, to yield a bundle of filaments (thread).
  • the finish liquid is constituted by an oil/water emulsion, and is selected from those in the art, and capable of giving the thread antistatic and lubricant characteristics.
  • a thread-guide, finish-liquid-jet device can be used, which is equipped with a slot inside which the union of the filaments takes place, and with a bore through which the finish liquid is injected, by means of a metering pump.
  • the so-obtained finished thread is submitted to an interlacing treatment, so as to create at least 10, and up to 25 interlacing points per thread metre. That corresponds to values of from 10 to 4 cm between two adjacent interlacing points, as determined by APDC (Automatic Pin Drop Count). In the preferred form of practical embodiment, 15-18 interlacing points per thread metre are created.
  • all those devices can be used, which are known from the prior art, by means of which one or more continuous air stream(s) are delivered perpendicularly, or approximately perpendicularly, to the thread, so as to cause the phenomenon of entanglement of the filaments which compose the same thread.
  • the so-obtained interlaced thread is collected on a collection roll, and is stretched between said collection roll and a stretching roll.
  • the collection roll is a lapped chrome-coated roll, not heated, which revolves at a peripheral speed of, or higher than, 4,000 metres/minute, up to 5,000 metres/minute.
  • a single collection roll with a single open winding of the thread can be used, or a collection roll coupled with an idle roll, which a single closed winding of the thread, can be used.
  • a couple of lapped, chrome-plated, not heated, rolls can be used, with two or more thread windings.
  • the peripheral speed of the stretching rollers is maintained at values of from 4,800 to 6,000 metres/minute, so as to create a stretch ratio of from 1.2 to 1.35.
  • the so obtained interlaced and stretched thread is submitted to relaxation by treatment with superheated steam, carried out under conditions within which the structure of the same thread does not change, or does not substantially change.
  • steam superheated at a temperature of at least 115°C and up to 180°C, and preferably at temperatures of from 130°C to 170°C is used.
  • the contact between the thread and steam can be carried out inside a contact chamber, inside which the direct contact between the thread and the steam fed to the same chamber is carefully prevented.
  • FIG. 1 A form of contact chamber, suitable for that purposes, is shown in Figures 1 and 2 of the hereto attached drawing table.
  • FIG. 1 a perspective view of a contact chamber is shown, wherein the contact chamber is composed by two half-chambers (1) and (2), shown spaced apart from each other for the sake of clearness.
  • the two half-chambers (1) and (2) can be connected with each other, by means of screws, with the chamber being completely sealed in its rear portion, and with a port being formed which, peripherally, is of the order of 0.5 mm, and which extends through the area of passage of the thread (4), and to the front portion of the chamber.
  • the chamber is furthermore provided on the upper with a thread guide of a ceramic material (3), in order to prevent the thread (4) from coming into contact with the metal walls of the contact chamber.
  • a similar thread-guide, not shown in the Figure, is provided in the bottom portion of the contact chamber.
  • the inlet channel for superheated steam and by the reference numeral (6) the outlet channel for the exhausted steam is indicated.
  • Figure 2 shows a vertical sectional view of the half-chamber (1) of Figure 1.
  • the reference numerals (5) and (6) the superheated steam inlet and the exhausted steam outlet are still respectively indicated.
  • the outline of the inner wall of the half-chamber can be observed in particular, which is given a crown shape (8) in its upper portion.
  • the steam entering the chamber through the duct (7) having a direction substantially from down upwards, impinges the crown-­shaped inner wall of the half-chamber (1), generating a turbulent motion of steam, and preventing the thread (4) from coming into direct contact with the superheated steam entering the chamber.
  • the other half-chamber (2) does not require any particular shapes in its inner wall, which may be simply hollow, with its hollow being directed outwards.
  • the contact chamber shall be suitably thermally insulated, by means of a suitable thermally insulating material.
  • the present Applicant found that, in order to obtain a complete relaxation of the stretched thread extremely short contact times are enough, which are as short as achievable inside a contact chamber having a height of a few cm, in general of from 4 to 6 cm.
  • the steamed thread is then wound at a speed which is approximately 8-10% lower than the peripheral speed of the stretching rollers.
  • the winding is carried out at values comprised within the range of from 4,300 to 5,600 metres/minute, with a winding tension of the order of 0.10 to 0.15 g/denier.
  • a stretched thread of polyamide-6 is obtained, which has a number of interlacements practically equal to that given during the step which precedes the stretching, on bobbins of extremely good appearance and quality, free from deformations, and with a practically quantitative yield.
  • the characteristics of such a thread are uniform, and are typically comprised within the following ranges of values: count of from 22 to 78 dtex; tenacity higher than 40 cN/dtex; elongation at break lower than 45%; and residual shrink of, or lower than, 10%, in water at 100°C.
  • Such a yarn can be directly warped with optimum warping behaviours (0.01-0.03 faults per thread kg), and then transformed into a piece endowed with excellent dyeing evenness.
  • Polyamide-6 granules dried down to a moisture content of approximately 0.05% by weight, are molten inside a screw extruder of 38 mm of diameter, and having a length/diameter ratio of 24/1.
  • the molten material at a temperature of 275°C, is fed through a 4-delivery metering pump, to 4 spinnerets, each having 45 mm of diameter, and each equipped with 10 bores.
  • Each bore has a diameter of 0.25 mm, and the height to diameter ratio of the bore is of 2.
  • the extruded filaments are cooled inside a cooling chamber provided under the spinnerets, by means of an air stream fed with an inlet temperature of 22°C, a relative humidity of 60%, and a constant outlet rate of 0.5 metres/second.
  • the ceramic device manufactured by BETTINI, Model BX914A, of the slotted type is used, which is provided, at slot bottom, with a channel through which by means of a metering pump an oil/water emulsion having antistatic and lubricant characteristics, is fed.
  • the four threads, provided with the finish coating, run then, in air, through an approximately 6-metre long spinning tube, and, at tube outlet, each of them runs through an interlacement device manufactured by BARMAG, Ceramic Tangle Jet Type, Model 465664/9, provided with two bores of 1.1 mm each.
  • Each of the four interlaced threads is collected on a not heated roll/idle roll couple, with a single closed winding of the thread, which revolves at a peripheral speed of 4,500 metres/minute.
  • the stretching of the four threads takes place between said roll/idle roll couple, and a couple of not heated rolls, with 2.5 thread turns, which revolve at a peripheral speed of 5,400 metres/minute.
  • the four stretched threads subsequently run each through a contact chamber of the type disclosed in the present disclosure, and shown in the hereto attached drawing table.
  • the contact chamber has a height of 52 mm, and to the chamber superheated steam is fed at a temperature of 150°C.
  • Each of the four steamed threads is finally wound on a winding machine, which operates at a collection speed of 4,900 metres/minute, with a winding tension of 0.10-­0.15 grams/denier.
  • Packages of 10 kg of thread, free from faults, and from any phenomena of instability of bobbin, are formed.
  • the so-obtained threads of polyamide-6 have a number of interlacements practically equal to that given during the step preceding the stretching.
  • the characteristics of the threads are: - Count :44 dtex - Tenacity :42-44 cN/tex - Elongation at Break : 42 % - Residual Shrink in water at 100°C : 10 %

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Artificial Filaments (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
EP88200494A 1987-03-20 1988-03-17 Verfahren zur Herstellung eines Polyamid-6-Fadens Withdrawn EP0283097A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1977587 1987-03-20
IT19775/87A IT1203844B (it) 1987-03-20 1987-03-20 Procedimento per la produzione di un filato di poliammide-6

Publications (2)

Publication Number Publication Date
EP0283097A2 true EP0283097A2 (de) 1988-09-21
EP0283097A3 EP0283097A3 (de) 1990-07-25

Family

ID=11161117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88200494A Withdrawn EP0283097A3 (de) 1987-03-20 1988-03-17 Verfahren zur Herstellung eines Polyamid-6-Fadens

Country Status (4)

Country Link
EP (1) EP0283097A3 (de)
AR (1) AR242271A1 (de)
BR (1) BR8801341A (de)
IT (1) IT1203844B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997036736A1 (de) * 1996-03-31 1997-10-09 Bernhard Lipp Verfahren und vorrichtung zum konditionieren von kunststoffteilen mit wasserdampf
WO1997048840A1 (fr) * 1996-06-19 1997-12-24 Nylstar S.A. Fil polyamide et prodede de filage-etirage integre pour la production de ce fil

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1471395A (en) * 1974-07-20 1977-04-27 Bayer Ag Process for the production of polyamide-6 filaments yarns
FR2385822A1 (fr) * 1977-04-01 1978-10-27 Rhone Poulenc Textile Procede d'obtention de fils en polyhexamethyleneadipamide orientes au filage et non-etires
FR2490252A1 (fr) * 1980-09-17 1982-03-19 Inventa Ag Procede pour la stabilisation de files de filaments en polyamide 6
EP0124454A1 (de) * 1983-04-29 1984-11-07 Rhone-Poulenc Fibres Verfahren zur Verbesserung der Strukturgleichmässigkeit von Fasern aus thermoplastischen Polymeren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1471395A (en) * 1974-07-20 1977-04-27 Bayer Ag Process for the production of polyamide-6 filaments yarns
FR2385822A1 (fr) * 1977-04-01 1978-10-27 Rhone Poulenc Textile Procede d'obtention de fils en polyhexamethyleneadipamide orientes au filage et non-etires
FR2490252A1 (fr) * 1980-09-17 1982-03-19 Inventa Ag Procede pour la stabilisation de files de filaments en polyamide 6
EP0124454A1 (de) * 1983-04-29 1984-11-07 Rhone-Poulenc Fibres Verfahren zur Verbesserung der Strukturgleichmässigkeit von Fasern aus thermoplastischen Polymeren

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997036736A1 (de) * 1996-03-31 1997-10-09 Bernhard Lipp Verfahren und vorrichtung zum konditionieren von kunststoffteilen mit wasserdampf
WO1997048840A1 (fr) * 1996-06-19 1997-12-24 Nylstar S.A. Fil polyamide et prodede de filage-etirage integre pour la production de ce fil
FR2750144A1 (fr) * 1996-06-19 1997-12-26 Nylstar Sa Fil polyamide et procede de filage-etirage integre pour la production de ce fil

Also Published As

Publication number Publication date
EP0283097A3 (de) 1990-07-25
IT8719775A0 (it) 1987-03-20
BR8801341A (pt) 1988-11-01
AR242271A1 (es) 1993-03-31
IT1203844B (it) 1989-02-23

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