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
• • 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
  • D01D5/00—Formation of filaments, threads, or the like
  • D01D5/08—Melt spinning methods

Definitions

• the invention relates to a method for producing fibers made of polytetramethylene adipamide using the melt spinning process with the process steps melt the starting polymer in an extruder, possibly additive containing polymer to a melt spinning device, press this molten polymer through spinnerets to form of filaments, cool the spun filaments through blowing with air, applying a preparation to the filaments, pulling off the filaments with a suitable pulling device, stretch the spun filaments and relax of the drawn filaments.
• polytetramethylene adipamide The manufacture of fibers from polytetramethylene adipamide is known. Usually made of this as polyamide 4.6, sometimes also known as nylon 4.6, polymer spun fibers are mainly used in technical textiles.
• polyamide 4.6 sometimes also known as nylon 4.6
• polymer spun fibers are mainly used in technical textiles.
• One of essential advantages of those made from polytetramethylene adipamide Fibers is their opposite to other aliphatic polyamides such as polyamide 6.6 (polyhexamethylene adipamide) or polyamide 6 (polycaproamide) higher thermal resistance.
• JP-A 05 - 132 820 A further description of a spinning process is in JP-A 05 - 132 820 included.
• a granulate becomes one Melt melted at a temperature of 290 - 320 ° C. Spinning takes place in this temperature range. The freshly spun Material is applied after applying a non-aqueous Preparation, continuously extended.
• a spinning temperature of 300 ° C +/- 3 ° C and granulate as the starting material is described by Schmack et al. (Chemical Fibers International 45 (1995), pp. 475-477) recommended. Contains preparation this document no information.
• Polytetamethylene adipamide falls during polymer production inevitably in the form of powder. On normal extruders like they are usually used for fiber production this powder does not melt in the way that a Get homogeneous melt for easy melt spinning becomes. It must therefore, as JP-A 59-088810 teaches, with a twin screw extruder can be used when polymer powder should be melted. That kind of extruders is often not available in fiber production plants, so that expensive investments are needed to polytetramethylene adipamide to be able to process into fibers.
• non-aqueous preparations use because according to the information given there under the influence of aqueous preparations on the fiber surface so-called spherolites can form the stretching behavior of the spun material.
• Such non-aqueous ones Preparations contain the actual one, for example Preparative in mineral oil.
• the disadvantage of the non-aqueous preparation is in addition to the opposite aqueous preparation systems higher costs especially in the poorer washability of the preparations and one see increased wastewater pollution.
• the task was to provide a procedure make, which does not have the disadvantages mentioned here and this is the prerequisite for a more cost-effective production of fibers made of polytetramethylene adipamide.
• pellets preferably have a cylinder-like shape.
• the length of the pellets is usually between 0.1 and 8 mm, preferably between 1 and 6 mm.
• the diameter of the pellets lies between 0.1 and 5 mm, preferably between 1.5 and 4 mm, particularly preferably between 2.5 and 3.5 mm.
• polytetramethylene adipamide as a polymer for fiber production Is used is not just a homopolymer of these Composition, but also a copolymer with at least To understand 85% polytetramethylene adipamide units.
• Caprolactam is mainly used. Preferred shares of caprolactam in the polymer is 3 - 10%.
• the thermal properties of polytetramethylene adipamide influenced, i.e. that with an increased proportion of comonomers the melting point is lowered.
• the polymer can contain additives, for example stabilizing agents, contain. These can already occur during polymer production added or via a master batch into the molten polymer be dosed. Other ways of adding additives are the extruder addition to the molten polymer or powdering the additive onto the pellets before melting.
• a polymer comes with a caprolactam content in the above Range, the melt temperature can be approx. 300 ° C be.
• the fibers are formed in the melt spinning process usual way by feeding the melt to spinnerets and pressing the melt through the nozzle openings, the Fiber formation occurs. Cooling takes place below the nozzle in the usual way in melt spinning by blowing on Air.
• a preparation on water is applied to the freshly spun threads Base applied. Products that are not water-soluble are in the Preparation preparation in the form of an emulsion included.
• the fiber production can be both continuous after a Spin-stretch process, as well as discounted.
• the first-mentioned method is the freshly spun web not wound up, but immediately after spinning fed to a stretching zone and stretched there.
• the corresponding coils will be then submitted to a stretching machine.
• the stretching can be carried out in one or two stages become. After stretching, the yarn can pass through a so-called relaxation zone are driven, the am Exit of this zone arranged godets at slower speed operated as the feed godets.
• a another possibility is the relaxation process in the winding zone to lay, i.e. that the take-up unit with a is driven at a lower speed than the supply unit.
• the process described is preferred for production of filament yarns made of polytetramethylene adipamide insert. It but can also be used for the production of staple fibers. In addition, spunbonded nonwovens made from this polymer can also be used for the conditions described in the spinning part are produced.
• the length of the pellets showed an average of 4.2 mm with a standard deviation from 1.3 mm.
• As an average value for the diameter of the Pellets were found to be 2.7 mm.
• the standard deviation was 0.08 mm.
• the temperature in the melt line was 302 ° C.
• the melt was fed to a die with 36 openings and pressed through it.
• the freshly spun threads were cooled by blowing with 150 m 3 / h of air.
• An aqueous preparation was then applied via preparation godets.
• the concentration of the preparation in the preparation batch was approx. 15%.
• the filaments thus spun were wound up at a speed of 600 m / min.
• the bobbins were a stretching machine that used the yarn Deducted 580 m / min, submitted. On the stretching machine was in one Ratio of 1: 3.91 over a so-called hot plate, at which a temperature of 210 ° C was set, stretched. The temperature of the intake godets was 105 ° C, that of the discharge godets 215 ° C. After that, with a relaxation ratio relaxed from 1: 0.97.
• the yarn produced in this way showed the following data: Yarn titer 235 dtex Filament count 36 strength 69.8 cN / tex Elongation at break% 15.9% Hot air shrinkage (190 ° C) 3.3%

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Family Cites Families (4)

• 1999
  • 1999-03-02 EP EP99104127A patent/EP0942079A3/fr not_active Withdrawn
  • 1999-03-08 CA CA002265059A patent/CA2265059A1/fr not_active Abandoned
  • 1999-03-08 ZA ZA9901846A patent/ZA991846B/xx unknown
  • 1999-03-08 KR KR1019990007487A patent/KR19990077675A/ko not_active Withdrawn
  • 1999-03-08 JP JP11060662A patent/JPH11315413A/ja active Pending
  • 1999-03-09 BR BR9900983-8A patent/BR9900983A/pt not_active Application Discontinuation

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