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
  • 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
  • D01D10/0409—Supporting filaments or the like during their treatment on bobbins
• • 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
  • D01D10/06—Washing or drying

Definitions

• Our present invention relates to the manufacture of artificial silk and more particularly to drying artificial silk.
• the same effect may be produced in a much simpler way by preventing the moisture from escaping through the perforations towards the interior of the bobbin and forcing it to escape exclusively through the outer surface of the winding.
• the bobbins may for instance be closed at their both ends, or a number of bobbins may be superposed in known manner to form a column of bobbins and the ends of the column may be closed, or the bobbins may be slid on a tube, the external diameter of which is approximately the inner diameter of the bobbin, or the inner surface of the bobbin may be covered by fitting an elastic sleeve; briefiy, there may be used any means by which the perforations are closed and a perforated bobbin is transformed in a certain degree into a nonperforated one.
• any means is used and lies within the scope of the invention which causes drying to be started at the outer layers of the Winding and to be progressively carried towards the interior layers, so that the outer layers of threads are dried first, whereas the layer of threads lying directly on the bobbin is dried last.
• the uniformity of the different portions of a hank of threads as to their dyeing properties may be still further improved and ensured by interrupting the drying operation prematurely, that is to say before the winding of thread is dried throughout.
• a silk is obtained which, when perfectly dry, contains 6 to '7 grams of water per grams of dry cellulose hydrate.
• drying is interrupted prior to obtaining this content of water, for instance at a content of water of say 15, 20 or 25 per cent.
• the essence of the invention therefore is the drying of a winding of threads only from the outer surface of the winding towards the support of the winding in such a manner that the innermost layers of the winding are less dried than the outer layers thereof.
• Example 1 A winding of wet viscose silk, spun in a so-called Muller II bath containing sulfuric acid and sodium sulfate, and wound on perforated bobbins, is washed free from acid by the suction or pressure method and then contains so much moisture that 315 grams of wet fibers correspond with 100 grams of dry cellulose.
• the bobbins are then dried with air having a relative content of moisture of 30 per cent at a temperature of between and C. while closing the perforations in one of the aforesaid manners until the winding contains 16 to 18 per cent of moisture and grams of dry cellulose weighing 116 to 118 grams.
• the silk After having been kept for some time in a moistening room, the silk is twisted at an atmosphere having a high content of moisture on twisting machines in which there are several rows of bobbins one above the other and further treated in the usual way.
• Example 2 Vinylse silk spun in a spinning bath containing sulfuric acid, sodium sulfate and magnesium sulfate, and wound on perforated bobbins, is washed free from acid by the suction or pressure method, and then has a wet weight of about 260 gramscalculated on 100 grams'of dry cellulose, and is dried, while closing the perforations, at a temperature of between 40 and 60 C. with air having a relative content of moisture of 60 per cent, until the winding contains 25 per cent of moisture or a weight of about grams per 100 grams of dry cellulose.
• the further treatment is as described in Example 1.
• the process may be applied with advantage in all cases where awet fiber is collected on a solid, unyielding and perforated support and where drying produces a considerable shrinking of the thread both in a longitudinal and a lateral direction.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Treatment Of Fiber Materials (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6448692

Family Applications (1)

Country Status (5)

• 1934
  • 1934-03-08 FR FR769850D patent/FR769850A/fr not_active Expired
  • 1934-03-08 US US714722A patent/US2042787A/en not_active Expired - Lifetime
  • 1934-03-09 BE BE401900D patent/BE401900A/xx unknown
  • 1934-03-09 NL NL68698A patent/NL37713C/xx active
  • 1934-03-14 GB GB8060/34A patent/GB417307A/en not_active Expired

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