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
  • D01F2/00—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
  • D01F2/06—Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
  • D01F2/08—Composition of the spinning solution or the bath
  • D01F2/10—Addition to the spinning solution or spinning bath of substances which exert their effect equally well in either

Definitions

• This invention relates to a process for the production from viscose of artificial threads and other shaped objects, including films, having greatly improved properties as regards their resilience and their smaller degree of swelling.
• the invention also relates to the resulting products.
• One of the principal objects of the present invention is to provide a new and improved method for spinning artificial products such as threads and other shaped objects from viscose in such manner as to confer upon them greatly improved properties as regards their strength and elasticity.
• a further object of the invention is to provide a new and improved method for producing prodnets of the kind just indicated having unusually strong and well-defined peripheral zones.-
• a still further object of the invention is to provide improved products of the kind indicated.
• threads and other shaped objects having a strong peripheral zone and greatly improved strength and elasticity properties may be produced from viscose ifimidazole is added to a viscose and preferably a viscose which is not too ripe prior to the spinning or other shaping operation. It has been established that the difficulties arising when viscose containing monoamine is spun are obviated when using imidazole as additive in the manner indicated 7 and that it is possible to operate successfully with withdrawal speeds of 40-50 m./min.
• the imidazole is added to the viscose in amounts of' 0.06-0.4 by weight, preferably 0.l2-.0.l5 by weight,
• the imidazole may be employed .with viscoses having a conventional composition, examples of which are those having 7'8% of cellulose and 5-7% of NaOH.
• spinning ripeness of the viscose preferably should not have a gamma value lower than 42; i.e., spinning preferably is done with an unripe viscose.
• the spinning baths employed preferably contain zinc in the form of zinc sulphate in amounts of 30-50 g./l.; the acid. content (sulphuric acid) may fluctuate within the limits of 40-65 g./l.; while the sodium sulphate content may be within the usual limits, namely, between about 160 and 260 g./l.
• the spinning bath temperature lies preferably between 45 and 70 C.
• the withdrawal speed of the thread or other shaped object preferably is between 40 and 50 m./min. This speed may be further increased if known measures are taken to impart to the spinning b-ath,,at least on the first part of its travel after the spinning nozzle, a speed which is substantially equal to the thread speed, so that the friction between the thread and the spinning bath is thereby substantially reduced.
• the bath zone is preferably at least 30 cm. long.
• the thread or other shaped object is then drawn or stretched by a factor of -120%, preferably -l00%, in a second hot bath (e.g., at a temperature higher than 90 C.) which contains 2-10 g./l. of H 80
• the thread may thereafter be deposited onto a bobbin, into a centrifuge or onto a perforated web,
• Threads spun by the process according to the present invention have strength values of 400-420 g./ den., and these values may be increased still further such as to 430-460 g./100 den. by subsequent stretching. They are characterized by a very high shrinkage, a high abrasion resistance value and a low degree of swelling.
• Example Alkali cellulose consisting of linters and wood cellulose is sulphidized for 5 hours with 42% carbon disulphide and the Xanthate obtained is dissolved to form a viscose with 7.3% of cellulose and 5.5% of NaOH.
• 0.12% by weight of imidazole is introduced into the viscose.
• the viscose is then filtered, deaerated and ripened in the usual manner,
• the spinning bath has the composition of 52 g./l. of sulphuric acid, 40 g./l. of zinc sulphate and g./l. of sodium sulphate and a temperature of 7 58 C.
• the thread has 1000 individual threads withan individual titre of 1.65 den. and is guided over a path of 65 cm. in the spinning bath and is withdrawn over a suitable roller or godet at a speed of 21 m./min. The thread then travels through a second bath containing 2,914,004 Patented Mar. 7,
• Viscose spinning solution containing imidazole in the amount of 0.06-0.4% by weight based on the viscose.
• a process for the production of regenerated cellulose threads from viscose comprising incorporating into viscose 0.06-0.4% by weight based on the viscose of imidazole, extruding the resulting viscose into an aqueous bath having the composition of -50 g./I. of zinc sulphate and -65 g./l. of sulphuric acid, treating the resulting extruded object in a second hot bath containing 2-10 g./l. of sulphuric acid, and stretching same by a factor of 120%.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Artificial Filaments (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=6221647

Family Applications (1)

Country Status (6)

Cited By (1)

Citations (17)

• 1955
  • 1955-08-16 BE BE540586A patent/BE540586A/xx unknown
  • 1955-08-24 FR FR1139301D patent/FR1139301A/fr not_active Expired
  • 1955-08-31 NL NL200059A patent/NL87098C/xx active
  • 1955-09-23 CH CH337609D patent/CH337609A/de unknown
  • 1955-10-03 GB GB28119/55A patent/GB785818A/en not_active Expired
  • 1955-10-17 US US541096A patent/US2974004A/en not_active Expired - Lifetime

Patent Citations (17)

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