Classifications

• • 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
  • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
• • 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
  • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
  • D01F2/24—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives
  • D01F2/28—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from cellulose derivatives from organic cellulose esters or ethers, e.g. cellulose acetate

Definitions

• This invention relates to the artificial silk art and more particularly to a process of stretching the artificial silk.
• the thread or filament is subjected to a temperature at which the material forming the base of the thread or filament is softened and/or rendered more or less plastic. It is apparent that the temperature used may vary within wide limits.
• the heating may be 1929, and in Great Britain effected gradually, for example, by providing several heating elements so regulated and adjusted that the temperature gradually increases, whereby the thread passing therethrough will be gradually rendered plastic.
• the thread or filament in the plastic stage is stretched as hereafter explained.
• the thread may be cooled in any manner. If desired, the thread may pass through elements having gradual decreasing temperatures, whereby the thread or filament is gradually cooled to room temperature.
• a filament or thread of any material herein described and particularly cellulose acetate may be stretched be- .yond the dry breaking point of the original thread or filament up to 2, 5, l0 and even 35 times or more its original length.
• Example-A cellulose acetate thread comprising 13 filaments is unwound at a speed of 50 meters per minute and-caused to pass through a heating apparatus, the temperature of which is regulated to or about 245 C. The thread is passed through this apparatus so that it may acquire a temperature of approximately 185 C.
• the process will modify the luster or sheen of the thread.
• the sheen or luster may be partially or totally removed, whereby a thread of a more or less dull luster may be obtained.
• This process may also be utilized to obtain artificial silk of very fine denier which is difficult to obtain directly by spinning.
• This process it is possible to spin a 45 denier silk and by stretching transform it into 20 denier silk. It is also possible to spin a 200 denier silk and by stretching transform it into a thread of a titre of 20 threads or even less.
• the invention is equally applicable to elementary filaments constituting the thread.
• a thread of 2 deniers per filament readily obtainable in the usual spinning process is stretched so that a thread having a filament denier difficult and/or practically im-. possible to obtain by the usual methods of direct spinning, viz. 1 denier per filament or even 0.1 denier per filament may be obtained.
• the artificial thread or filament may be stretched to various lengths and degrees. It has been found possible to stretch an artificial thread or filament beyond the dry breaking point of the original thread or filament and to a length extending up to 2, 5, 10 or even 35 or more times its original length.
• the process can be applied to a thread made of any material which is capable of being rendered plastic or, softened by heat. It may be applied to a thread produced from cellulose derivatives, such as the acetates, ethers, nitrates, etc. or to a mixture of one of said cellulose derivativeswith various agents, such as softening compounds and the like.
• the process can be applied to artificial silk obtained by spinning a mixture of cellulose acetate and triphenol phosphate or other substances.
• this process of stretching may be performed by a special operation on the finished filament or thread. It may also be carried, out in an operation combined with the production of the thread, at the moment when the thread or filament is spun or during the progress of any finishing operation or during the industrial application of said filament or thread, such as throwing, doubling, hanking, skeining, warping etc. It may be performed either in a continuous operation, that is, while the thread is passing between winding devices or on skeins of thread. The thread treated by this process may be twisted or the filaments thereof may be parallel to one another.
• a process of increasing the tensile strength of artificial threads which comprises rendering plastic by heating in the dry state artificial threads or filaments having a cellulose derivative as the base thereof and stretching the same beyond the'breaking point of the original dry threads or filaments.
• a process of increasing the tensile strength of artificial threads which comprises rendering plastic by heating in the dry state artificial threads or filaments having cellulose acetate as the base thereof and stretching the same beyond the breaking point of the original dry threads or filaments.
• a process of increasing the tensile strength of artificial threads which comprises rendering plastic by heating in the dry state artificial threads or filaments having a cellulose derivative as the base thereof and stretching the same until said threads or filaments are at least twice the original length.
• a process of increasing the tensile strength of artificial threads which comprises rendering plastic by heating in the dry state artificial threads or filaments having cellulose acetate as the base thereof and stretching the same until said threads or filaments are at least twice the original length.
• a process of increasing the tensile strength of artificial threads which comprises rendering plastic by heating in the dry state artificial threadsor filaments having a cellulose derivative as the base thereof and stretching the same until said threads or filaments are from 2 to 35 times the original length.
• a process of increasing thetensile strength of artificial threads which comprises rendering plastic by heating in the dry state artificial threads or filaments having cellulose acetate as the base thereof and stretching the same until said threads or filaments are from 2 to 35 times the original length.

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=10324819

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (3)

• 0
  • BE BE364067D patent/BE364067A/xx unknown
  • NL NL26401D patent/NL26401C/xx active
• 1928
  • 1928-10-30 GB GB31552/28A patent/GB323846A/en not_active Expired
• 1929
  • 1929-09-03 DE DES93717D patent/DE566930C/de not_active Expired
  • 1929-09-06 FR FR681429D patent/FR681429A/fr not_active Expired
  • 1929-10-12 US US399406A patent/US1921426A/en not_active Expired - Lifetime

Also Published As

Similar Documents