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
  • 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

Definitions

• This invention relates to the production of filaments of synthetic linear condensation 1937 now Patent No. 2,130,948, all of w. H.
• Carothers are capable of being formed by melt-spinning into filaments, ribbons, and the like, which possess the unusual property of being capable of being cold-drawn," i. e., drawn or elongated under application of stress in the solid state, with resulting orientation of internal structure and corresponding marked benefits to their mechanical properties.
• filaments of synthetic linear condensation polymers particularly to coarser filaments
• the production of filaments of circular cross section may readily be accomplished by following the teachings of the prior art but this has not been the case with respect to filaments of polymeric hexamethylene adipamide.
• An object of the present invention is to provide a process of manufacturing polymeric hexamethylene adipamide filaments which are substantially perfectly circular in cross section.
• a further object is to provide such a process which will produce filaments in no way impairedwith respect to their other properties.
• the above objects are accomplished according to the present invention by extruding molten polymeric hexamethylene adipamide through a circular orifice into a quenching liquid having substantially'no solvent action on the polymer and maintained at .atemperature of at least 35 C.
• theiquenching liquid is water and, for practicaloperationpit would be kept at a temperature of 35F-4Q" C.
• the filament is subsequently cold-drawn after being thoroughly soaked in water or many be cold-drawn at a temperature somewhat above room temperature.
• the present invention resides in the discovery that, if extruded filaments of polymeric hexamethylene adipamide are quenched in a non-solvent quenching liquid maintained at a temperature of 35 C. or more, the cross sectional shape of the extruded filament is not changed but retains the shape of the orifice through which the molten polymer was extruded. This is especially observable in the manufacture of coarser filaments and it is the manufacture of such filaments to which the present invention is most advantageously applicable.
• the filament thus quenched is preferably soaked in water before being cold-drawn, or is cold-drawn while at a temperature somewhat above room temperature, either of which techniques facilitates the cold-drawing.
• the molpolymer may be molten when it contacts the quenching liquid or may be set or partially set subsequent operationsunder commercial conditions. Specimens of filaments thus produced were drawn by hand, i. e., stretched by'hand until they ceased to yield, without any intermediate treatment. Filaments quenchedin the quenching liquid maintained at 40 C. or less 7 could be drawn satisfactorily in this manner.
• filament specimens quenched at 70 C. could be Temperature Time of soak- Deviation of quenching ing before from liquid drawing circularity 0. Days Percent 12 l 31. 6 20 l 21. 1 25 l 12. 8 i0 1 7. 2 l 1. 9 l) 1. 7) 40) 2) 2. 9) 2 1. 4 2 1. 4 70) 2) l. 3) 70) 3) I. 6) 80) 2) 2. 4) 80) 3) l. 9)
• the quenching liquid may consist of a mixture of compounds. Also, it may contain wetting agents, dyes, and the like.
• the quenching liquid is used in the form of a bath or a spray although the former is apt to be more convenient.
• the temperature of the liquid may be regulated or kept constant by any suitable means.
• the colddrawing is facilitated by first soaking the filament in water, the duration of said soaking being regulated to avoid any difiiculty in, the cold drawing. Usually a period of 24 hours will be suificient but, as shown hereinbefore, a soaking of 48 hours or even longer maybe desirable where the filament has been quenched in a liquid maintained at a relatively high temperature. Rather than soaking the filament in water, it may be warmed to a temperature of from about 50 C.
• the present invention provides a method of ensuring'the substantiahcircularity of cross sections of filaments of polymeric hexamethylene extruded from a circular orifice and is of great practical value in the production of filaments of this material for uses in which circularity of the filament is of prime importance.
• This circularity oi the filament is achieved in accordance with this invention at some sacrifice of tensile strength but without significant impairment of the other important properties of the filament.
• Process of manufacturing filaments of polymeric hexamethylene adipamide of circular cross section which comprises extruding molten polymer through a circular orifice into a quenching liquid having substantially no solvent action on said polymer and maintained at a temperature of 35 C. to 45 C.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Artificial Filaments (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Priority Applications (5)

Applications Claiming Priority (1)

Publications (1)

Family

ID=23363917

Family Applications (1)

Country Status (5)

Cited By (11)

Families Citing this family (1)

• 0
  • BE BE461575D patent/BE461575A/xx unknown
  • NL NL56120D patent/NL56120C/xx active
• 1940
  • 1940-07-25 US US347492A patent/US2285552A/en not_active Expired - Lifetime
• 1941
  • 1941-07-25 GB GB9451/41A patent/GB550852A/en not_active Expired
• 1945
  • 1945-11-14 FR FR917428D patent/FR917428A/fr not_active Expired

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