Classifications

• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01B—MECHANICAL TREATMENT OF NATURAL FIBROUS OR FILAMENTARY MATERIAL TO OBTAIN FIBRES OF FILAMENTS, e.g. FOR SPINNING
  • D01B1/00—Mechanical separation of fibres from plant material, e.g. seeds, leaves, stalks
  • D01B1/10—Separating vegetable fibres from stalks or leaves
  • D01B1/14—Breaking or scutching, e.g. of flax; Decorticating
  • D01B1/30—Details of machines
  • D01B1/40—Arrangements for disposing of non-fibrous materials
  • D01B1/42—Arrangements for disposing of non-fibrous materials employing liquids
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01B—MECHANICAL TREATMENT OF NATURAL FIBROUS OR FILAMENTARY MATERIAL TO OBTAIN FIBRES OF FILAMENTS, e.g. FOR SPINNING
  • D01B1/00—Mechanical separation of fibres from plant material, e.g. seeds, leaves, stalks
  • D01B1/10—Separating vegetable fibres from stalks or leaves
  • D01B1/14—Breaking or scutching, e.g. of flax; Decorticating
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01C—CHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES
  • D01C1/00—Treatment of vegetable material

Definitions

• the present invention relates to flax spinning and more particularly to wet spinning of flax during which the wick or ribbon consisting of substantially parallel fibers is immersed in a bath intended to soften the cements and gums which bind the elementary fibers together. linen inside the technical fibers and to favor their dissociation during the subsequent stretching.
• the present invention relates to a method aiming to improve the existing technique, in particular in that it makes it possible, under certain conditions, to avoid passing over a bench with pins; on the other hand, it relates to a wet type flax yarn having improved properties, in particular in that it can be used in hosiery, on knitting machine.
• the spinning of flax in the wet is well known. It consists of fibers obtained from scutching, either scorched flax itself, or scorched flax, or scutching tows, to subject these fibers to different preparation operations: combing and / or carding, doubling- drawing with the aim of producing a drawing ribbon, that is to say a thin and regular ribbon, of fibers substantially parallelized, and finally carrying out the spinning by passing over a spindle bench where the drawing ribbon is transformed into a wick which is a slightly twisted ribbon, then by passing on a wet spinning bench.
• the flax yarn obtained by the wet technique has a natural appearance and a specific apparent structure, which are due to the presence of residual organic cements and to the mode of dissociation and sliding of the elementary fibers with respect to each other during the 'drawing.
• the aim set by the applicant is to propose a process for manufacturing a flax yarn, using the wet technique, which overcomes the aforementioned drawbacks, in that the yarn obtained on the one hand retains the appearance and the structure of a wet linen thread but on the other hand has sufficient flexibility for it to be used in hosiery.
• the preparation of the fiber ribbon can be carried out on any type of preparation material, linen, wool or cotton.
• the preparation of the ribbon can be carried out on preparation materials which are not necessarily of the linen type, but which can be of the wool type or even same cotton.
• Also known from document EP-A-253.828 is a process for treating a previously stained under-flax flax of the above type, in which the action of steam is at a pressure of the order of 30 bars for one duration of the order of 10 seconds, or at a pressure of the order of 15 bars for a duration of the order of 90 seconds but after the fibers have undergone a pretreatment consisting of impregnation with a basic or acid solution .
• the aim of this document is to obtain by this process a linen which is substantially free of encrusting materials.
• the wet spinning is carried out with a stretching ratio of between 50 and 140 from a ribbon which has not undergone passage on the spindle bench.
• a stretching ratio of between 50 and 140 from a ribbon which has not undergone passage on the spindle bench.
• the ribbon prior to wet spinning, the ribbon is subjected to an alkaline pretreatment, which makes it possible to improve the sliding of the elementary fibers during the stretching and the homogeneity of distribution of the cements.
• the ribbon has undergone a bleaching operation, for example with hydrogen peroxide.
• the starting material consists of scutching tows from the scouring of an undercooked linen. It is for example a flax that was prematurely picked up in the case of retting on the ground. Compared to normally rotted flax, under-rotted flax always contains more encrusting materials, since the cements which bind the fibers together could not be sufficiently degraded by the bacteriological agents of retting.
• tows undergo a preliminary cleaning treatment on a finishing card, which moreover presents them in the form of a ribbon.
• This ribbon is cut in sections of 300mm.
• the material thus cut is introduced into a reactor where it is impregnated with pure water, then subjected to a hydrolysis treatment in steam at 15 bars of pressure for a period of 40 seconds; at the expiration of this period, the opening of the discharge port of the reactor causes a sudden expansion by passing the pressure from 15 bars to atmospheric pressure and therefore the ejection by said orifice of the flax in a container containing slightly alkaline water where it is washed and then rinsed.
• the flax fibers thus treated, after drying, are transformed into a ribbon of 4 g / m per passage through the preparation machines, namely successively a passage through a finishing card, a passage in the GN4 double-stretching machine, two passages in a small combing machine , a passage in GN4 double-stretching machine and two passages in GN5 double-stretching machine without passage on a bench with spindles.
• the fineness of the ribbon is characterized by an IFS of 16.74 and a CV% of 5.07. It should be noted that with a linen not treated according to the process the IFS is normally greater than 20, which clearly shows an increase in the fineness of the fibers in the ribbon according to the invention.
• the ribbon undergoes a light degumming treatment using a solution of 2.5 g / l of sodium carbonate.
• Wet spinning is carried out on a continuous spinning machine with two drawing zones.
• the pressure of the stretching cylinders is obtained using a counterweight system.
• the ribbon goes into a tub filled with cold water; it is guided at the entrance and at the exit of the drawing train by ceramic guides.
• the spacing of the cylinders was 80 mm for the rear zone and 60 mm for the front zone; the twist was 410 rpm and the reception speed of the order of 13 m / mm.
• the wet flax yarn obtained had a metric number of 23, a resistance Rkm of 17 (CV% 20 to 25), an elongation of 1.6 to 1.8%.
• This yarn the appearance and structure of which are that of a traditional wet linen yarn, has a very great flexibility compared to a yarn obtained by the traditional process which makes it suitable for use under acceptable operating conditions on knitting looms, especially circular, and therefore suitable for use in hosiery.
• the invention is not limited to the embodiment which has been described by way of nonlimiting example.
• the length of the cut must be determined by the skilled person depending on the preparation circuit, linen, wool or cotton, which he has chosen.
• the ribbon, before wet spinning can undergo various treatments, for example a bleaching treatment, which leads to the manufacture of a bleached linen thread.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Molecular Biology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Wood Science & Technology (AREA)
• Zoology (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
• Preliminary Treatment Of Fibers (AREA)
• Treatment Of Fiber Materials (AREA)
• Artificial Filaments (AREA)
• Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9416327

Family Applications (1)

Country Status (9)

Families Citing this family (4)

Family Cites Families (6)

• 1991
  • 1991-08-12 FR FR9110504A patent/FR2680375B1/fr not_active Expired - Fee Related
• 1992
  • 1992-07-27 AT AT92402158T patent/ATE130054T1/de not_active IP Right Cessation
  • 1992-07-27 DE DE69205917T patent/DE69205917T2/de not_active Expired - Fee Related
  • 1992-07-27 EP EP92402158A patent/EP0527666B1/fr not_active Expired - Lifetime
  • 1992-08-04 BR BR929203033A patent/BR9203033A/pt not_active Application Discontinuation
  • 1992-08-11 RU SU925052233A patent/RU2066718C1/ru active
  • 1992-08-11 SK SK2482-92A patent/SK248292A3/sk unknown
  • 1992-08-11 CZ CS922482A patent/CZ283915B6/cs unknown
  • 1992-08-12 PL PL92295606A patent/PL170471B1/pl unknown

Also Published As

Similar Documents

Legal Events