WO2006088213A1 - Procede de fabrication de tissu non tisse de filament ultrafin - Google Patents

Procede de fabrication de tissu non tisse de filament ultrafin Download PDF

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Publication number
WO2006088213A1
WO2006088213A1 PCT/JP2006/303090 JP2006303090W WO2006088213A1 WO 2006088213 A1 WO2006088213 A1 WO 2006088213A1 JP 2006303090 W JP2006303090 W JP 2006303090W WO 2006088213 A1 WO2006088213 A1 WO 2006088213A1
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Prior art keywords
filament
filaments
nonwoven fabric
present
ultrafine
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PCT/JP2006/303090
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English (en)
Japanese (ja)
Inventor
Akihiro Suzuki
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University Of Yamanashi
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Priority to JP2007503794A priority Critical patent/JP4887501B2/ja
Publication of WO2006088213A1 publication Critical patent/WO2006088213A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/02—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of forming fleeces or layers, e.g. reorientation of yarns or filaments
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

Definitions

  • the present invention relates to a method for producing a nonwoven fabric composed of ultrafine filaments and a production apparatus therefor, and in particular, to produce a nonwoven fabric composed of ultrafine filaments by improving the molecular orientation of filaments by performing an ultra-high draw ratio by an infrared method. It relates to means. Background art
  • the inventor has invented a means for obtaining ultrafine filaments and nonwoven fabrics by an infrared method at a stretch ratio of 1,00,000 times or more with molecular orientation.
  • Japanese Patent Laid-Open No. 2000-166-1 1 5, Japanese Patent Laid-Open No. 2000-0 10 8 5 1, etc. These provided a means for obtaining ultrafine molecularly oriented filaments and a non-woven fabric composed thereof by convenient means.
  • the present invention relates to a non-woven fabric made of ultrafine filaments that have been developed and further improved in molecular orientation, and a means that enables kneading and stable production thereof.
  • Biodegradable fibers have been strongly demanded for household and industrial materials such as agricultural materials and omya packaging materials in order to shift to a resource recycling society.
  • Biodegradable fibers have many uses, especially in the field of non-woven fabrics, and various manufacturing methods are proposed. (For example, JP 2000-273750, JP 2001-123371).
  • the nonwoven fabric having a small filament diameter has been demanded.
  • due to poor spinnability and stretchability it was difficult to easily and inexpensively produce a nonwoven fabric with a small filament diameter.
  • biodegradable fibers in a broad sense include biodegradable absorbable fibers (for example, JP-A-8-182751), non-woven fabrics composed of biodegradable absorbable fibers from the medical aspect, suture prosthetic materials, adhesions It is used in various fields such as prevention materials, artificial skin, and cell culture substrates (for example, JP 2000-157622, JP 2004-321484). Even in this field, filaments that are thin and strong are used. There is a need for nonwoven fabrics. Disclosure of the invention
  • the present invention is a further development of the above-described conventional technology.
  • the purpose of the present invention is to improve the molecular orientation easily by a simple means without the need for a special high-accuracy high-level apparatus. It is possible to continuously produce a long-fiber non-woven fabric made of ultrafine filaments.
  • Another object of the present invention is to provide a non-woven fabric for medical use comprising ultrafine polyethylene terephthalate filaments.
  • the object of the present invention is to form an ultrafine biodegradable filament having a high degree of molecular orientation based on spinning a thick biodegradable filament under stable spinning conditions. It is to be able to produce a long fiber nonwoven fabric. Still another object is to provide a nonwoven fabric used for biodegradable and absorbable filaments, suture prosthesis materials, adhesion prevention materials, artificial skin, cell culture substrates and the like. Means for solving the problem
  • the present invention provides a means for obtaining a nonwoven fabric comprising a highly stretched filament by stretching an original filament with infrared rays.
  • the original filament may be one that has already been manufactured as a filament and wound on a reel or the like. This is a filament that is used in the spinning process and becomes a raw material for the stretching means of the present invention.
  • the filament is a substantially kneaded fiber, and is distinguished from a short fiber having a length of several millimeters to several tens of millimeters.
  • the original filament is preferably present alone, but it can be used even if it is assembled in several to several tens.
  • the filament in the present invention includes a combination of a single filament made of a single filament and a multifilament composed of a plurality of filaments.
  • j per single yarn
  • r means the single filament
  • yj and for a multifilament, It means “one filament y”.
  • the raw filament of the present invention is polyethylene terephthalate or aliphatic polyester Polyester including Nylon (including Nylon 6, Nylon 6 6) Polyamide including Polypropylene Polyethylene, Polyvinyl alcohol polymer, Acrylonitrile polymer, Fluoropolymer, Vinyl chloride polymer, Styrene Any filament made of a thermoplastic polymer such as a polymer, polyoxymethylene, or an ether ester polymer can be used.
  • polyethylene terephthalate, nylon (including nylon 6, nylon 66), and polypropylene have good stretchability and molecular orientation, and are particularly suitable for the production of a nonwoven fabric comprising the ultrafine filaments of the present invention.
  • a high-strength, high-elasticity polymer such as aramid also has good stretchability by the infrared beam of the present invention, and is particularly suitable for producing the ultrafine nonwoven fabric of the present invention.
  • the present invention can provide a production means particularly suitable for obtaining a non-woven fabric composed of highly stretched biodegradable filaments.
  • Biodegradable filaments are filaments made of biodegradable polymers.
  • Biodegradable polymers JISK 3 6 1 1) are relatively easily degraded by microorganisms and biological enzymes that live in natural soils and seawater. The product is considered to be a harmless polymer material.
  • the biodegradable filament in the present invention is composed of the biodegradable polymer described above, and the polymer is a thermoplastic polymer.
  • the polymer is a thermoplastic polymer.
  • the main component (30% or more).
  • a filament Fatty polyesters typified by polylactic acid, poly-strength prolactone, polybutylene succinate and their modified polymers, etc., these are the main components (30% or more) and contain other components. There may be.
  • the biodegradable filament has good strength after 12 months in the ground.
  • the filament is preferably 1/2 or less, more preferably 30% or less, and most preferably 10% or less. It is biodegradable and requires biodegradability in the ground to contribute to a recycling society.
  • the biodegradability of the present invention means broadly biodegradable and includes cases where it has biodegradability and absorbability.
  • Biodegradability is a property that is used in direct contact with living tissues such as cells, blood, and connective tissues and decomposes in the living body, but does not become a harmful substance but is absorbed in the living body.
  • the biodegradable absorbable filament in the present invention is composed of the above-described biodegradable absorbable polymer, for example, a filament composed of the following polymer. It consists of aliphatic polyesters typified by polydalicolic acid, polylactide, polydaltamic acid, poly p-dioxy acid, poly monomalic acid, poly i8-hydroxybutyric acid and their modified polymers. 30% or more) and may contain other components.
  • the present invention provides a means for forming a non-woven fabric after the original flame bran has been stretched.
  • the original filament may be one that has already been manufactured as a filament and wound up by pobbins or the like, or in the spinning process, the melted or dissolved filament has become a refilled flame due to cooling or solidification.
  • the filament may be used as a sex filament that is used in the spinning process and becomes a raw material for the stretching means of the present invention.
  • Biodegradable resins in particular polylactic acid and polyglycolic acid, have high thermal decomposability, and therefore cannot be spun at high temperatures.
  • the original filament of the present invention may be thick, it has a relatively large molecular weight.
  • the original filament of the present invention is characterized in that the stretchability is not significantly impaired even when the molecules are already oriented.
  • the stretching start portion stretched by the infrared light beam may be stretched with an expanded portion that is larger than the diameter of the original filament.
  • Such a unique phenomenon has not been observed in ordinary synthetic fiber drawing. This phenomenon is also thought to be due to the fact that the drawing temperature was raised to around the melting point of the biodegradable filaments, enabling drawing in a narrow region. In this way, by stretching with an expanding portion, it was possible to stretch 100 times or more, or 500 times or more, and 1,000 times or more under suitable conditions.
  • the original filament fed from the filament feeding means is stretched.
  • Various types of delivery means can be used as long as the filament can be delivered at a constant delivery speed such as a combination of drive rollers of several stages.
  • the original filament re-delivered by the filament delivery means is further sent by the gas flowing in the running direction of the original filament through the blower pipe.
  • the stretching tension is very small, if unevenness of tension occurs due to resistance in the middle of the filament being sent out, the stretchability is greatly affected. For this reason, it is desirable that such a blower pipe be sent so that the resistance is low.
  • the thing with the same shape as this blower tube is also used as a stretching tension adjusting means in the production of nonwoven fabric. The shape and the like of the blower tube are described in the nonwoven fabric manufacturing means.
  • the original filament that has been introduced is stretched by heating with an infrared light beam, but the heating is very narrow and is characterized by being heated in the range.
  • a guide for regulating the position of the filament is provided. It is possible to have such a function depending on the shape of the outlet of the above-mentioned blast pipe, but the blast pipe places emphasis on the ventilation of the gas that sends the filament and the ease of passing the filament. It is preferable to regulate the position of the filament with the design tool.
  • the guide can be a combination of thin tubes, grooves, coats, thins and pars.
  • the original filament of the present invention is heated to an appropriate temperature for stretching by an infrared light beam irradiated by an infrared heating means (including a laser). Infrared rays heat the original filament, but the range that is heated to the appropriate temperature for drawing is up and down in the axial direction of the filament at the center of the filament.
  • the thickness is preferably within 4 mm (length: 8 mm), more preferably 3 mm or less, and most preferably 2 mm or less.
  • the present invention makes it possible to stretch with a high degree of molecular orientation by abruptly stretching in a narrow area and region, and even with ultra-high magnification stretching, it is possible to reduce stretching breakage.
  • the center of the filament means the center of the filament bundle of the multifilament.
  • heating by a laser is particularly preferable.
  • a carbon dioxide laser with a wavelength of 10.6 ⁇ m and a YAG (yttrium, aluminum, garnet) laser with a wavelength of 1.06 j «m are particularly preferable.
  • Lasers can narrow the radiation range to a small extent and are concentrated at a specific wavelength, so it is a wasteful energy source. There are few ruggies.
  • the carbon dioxide laser of the present invention has a power density of 1 OW cm 2 or more, preferably 2 OW cm 2 or more, and most preferably 3 OW cm 2 or more. This is because the ultrahigh magnification stretching of the present invention can be achieved by concentrating energy of high power density in a narrow stretch region.
  • the infrared light beam is preferably irradiated from a plurality of locations.
  • the melting temperature of the polymer is high and it is difficult to melt, and in the case of filaments that are originally difficult to stretch, asymmetric heating makes y stretching difficult. Because it becomes.
  • Such irradiation from a plurality of places may be performed from a plurality of light sources of infrared light fluxes, but by reflecting the light flux from one light source with a gutter, a plurality of times along the path of the original filament. It can also be achieved by irradiation.
  • Mirrors can be used not only for fixed types but also for rotating types such as polygon mirrors.
  • a means for irradiating light sources from a plurality of light sources to a source filament from a plurality of places there is a means for irradiating light sources from a plurality of light sources to a source filament from a plurality of places.
  • a high-power light source can be obtained by using a plurality of laser oscillation devices that are stable and inexpensive with a relatively small laser light source.
  • drawing is performed by heating a filament or the like to an appropriate drawing temperature and applying tension thereto.
  • the stretch tension of the filament yarn that is applied when producing the nonwoven fabric composed of the filament yarn with improved orientation according to the present invention is very small, preferably 1 OMPa or less, more preferably 1 MPa or less, per single yarn, Most preferably, the film is stretched at 0.1 MPa or less. 1 Exceeds OMP a. In order to stretch, it is desirable to have such a small tension range. With such a low stretching tension, an extremely large magnification such as a stretching ratio of 100 times or more, preferably 500,000 times or more, and eventually 1,000 times or more can be realized.
  • the reason why the film can be stretched at such an ultra-high magnification is that the stretching temperature is extremely high, around the melting point, and it is a very narrow stretch region while maintaining the temperature. Seem.
  • the ordinary roller-to-roller stretching of synthetic fibers is characterized in that it is stretched in a significantly different range compared to stretching with a tension of 1 OMPa to 1 OOMPa.
  • the stretching tension of the filament rod is stretched by the tension generated by the gas flow in the blower pipe and the tension given by the filament's own weight. This is in principle different from general stretching in which stretching is performed by the tension given by the speed difference between the rollers or by the tension due to winding.
  • the drawn filament obtained is drawn at an ultrahigh magnification of 100 times or more, preferably 500 times or more, more preferably 1,00 times or more.
  • the drawing of the present invention is ultra-high magnification of 100 times or more.
  • the feature of the present invention is that it is possible to stretch the film. In this way, the ultra-high magnification can be stretched because it is very narrow and can be stretched in the region, so that the stretching temperature can be increased to around the melting point of the original filament. Therefore, the drawing tension is reduced, but the feature of the present invention is that a means for controlling the drawing tension and the ultrahigh magnification is found.
  • the degree of orientation f measured by birefringence of the original filament in the present invention is expressed by the following equation. In this equation, density correction is necessary, but it is complicated and is ignored.
  • ⁇ is the birefringence obtained by actual measurement
  • An c is the birefringence of the crystal of each polymer, which is obtained from theoretical values, etc., and these values do not necessarily match, but are generally used values.
  • polyethylene terephthalate it is 0.24
  • nylon 6 or 66 it is 0.096
  • isotactic polypropylene it is 0.042.
  • the birefringence value of crystals of polylactic acid and poly (L-glycolic acid) is said to be about 0.033.
  • the measurement method of birefringence in the present invention is based on the letter decision method.
  • the draw ratio ⁇ in the present invention is represented by the following equation from the diameter d o of the original filament and the diameter d of the filament after drawing.
  • the filament density is assumed to be constant.
  • the fiber diameter was measured with a scanning electron microscope (SE), and the average value of 10 points was measured based on the photograph taken at 350 times the original filament and 1000 times the drawn filament.
  • X-ray orientation degree f of the filament in the present invention is expressed by the following X-ray half-width method.
  • H represents the half value of the intensity distribution along the device surface of the surface having the main peak of the polymer crystal.
  • the present inventor was able to produce a nonwoven fabric made of stretched filaments by accumulating the stretched filaments on a traveling conveyor (Japanese Patent Laid-Open No. 20 0 4). — 1 0 7 8 5 1).
  • the non-woven fabric is significant in that a non-woven fabric composed of highly fine filaments and highly molecular oriented filaments can be easily produced.
  • the present invention relates to a means for further improving the degree of orientation of the filament constituting the nonwoven fabric.
  • a blower tube is provided after stretching. The original filament is heated by an infrared ray beam and passed through a blower tube.
  • the filament is controlled on the basis of the velocity of air in the blower tube and accumulated as a filament obtained at a constant magnification on the conveyor belt.
  • a conventional non-woven fabric manufacturing method is the spun pond method, which also uses a blower pipe (often called air soccer) just after spinning.
  • the blower pipe in the present invention differs in function from the air soccer in the spunbond method. In air soccer in the spunbond method, it is used to increase the draft ratio from the molten polymer immediately after spinning, and the higher the wind speed used for that purpose, the better. However, there is a sound velocity wall in the wind speed, and how to overcome that wall This is the current issue of the method.
  • the blower tube according to the present invention is not used for increasing the draft ratio from the molten resin in spinning, but is used as a means for applying tension for stretching the flamen cocoon once formed, and 10 MPa or less. It is used as a means for adjusting to a very small stretching tension. Therefore, a certain wind speed range is most suitable.
  • the blower speed generated by the blower pipe in the present invention is not a measured wind speed but a calculated wind speed calculated from the amount of air flowing through the blower pipe. This is because the wind speed in a narrow pipe is not accurate because the measurement equipment gives the wind speed when measuring the wind speed in a narrow space.
  • the wind speed in the blast pipe in the present invention is preferably 1.5 mnosec or more and 1 OmZsec or less, more preferably 2 m / s ⁇ c or more and 7 m / sec or less, 3 m / sec. Most preferably, it is 6 m / sec or less. This value is about two orders of magnitude smaller than the sound speed of 331 3 6 ⁇ 5.
  • the molecular orientation of the filament is improved, and the filament diameter is also reduced by the ultrahigh magnification drawing. In other words, by making these ranges, the filament drawing effect is best.
  • the molecular orientation of the filament is smaller than that of the present invention while approaching the speed of sound and using the wind speed, and the filament diameter that can be easily realized by the present invention is 10 microns or less. It is difficult to make a non-woven fabric by the spunbond method.
  • a nonwoven fabric having a filament diameter of 10 m or less can be easily obtained, and a nonwoven fabric comprising filaments of 5 / m or less, 3 / m or less can be obtained.
  • room temperature gas is usually used, but heated air is used when it is desired to heat the stretched filament (for example, to bring about a heat treatment effect).
  • an inert gas such as nitrogen gas is used, and in order to prevent the scattering of moisture, a gas containing water vapor or moisture is used.
  • the blower pipe in the present invention does not necessarily have a cylindrical shape, and may have a groove shape. When multiple streams are used simultaneously, rectangles and other shapes are also used.
  • the cross section of the tube for flowing a single filament is preferably a circle, but may be rectangular or other shapes.
  • the gas flowing through the pipe may be supplied from one of the branched pipes, or may be supplied by a hole from the outer pipe to the inner pipe in duplicate.
  • Filament air-entangled nozzles used for synthetic fiber interlace spinning and Taslan processing are also used as the blower tube of the present invention.
  • a multiple simultaneous suction system used as an air soccer of a spunbond nonwoven fabric can also be used in the present invention. However, since a large amount of air as much as a span pond is not required, the structure may be simple.
  • the nonwoven fabric made of filaments according to the present invention is preferably heat-treated after being accumulated on a conveyor.
  • the drawn filaments in the present invention are highly molecularly oriented and are accumulated on a conveyor at an ultra-high speed, so that the heat treatment is insufficient. Therefore, heat treatment is performed on the conveyor, but simply by heating with hot air or infrared rays on the conveyor, as with normal nonwoven fabrics, the aggregate of filaments on the conveyor shrinks as a whole, resulting in a narrow width. Not only the molecular orientation but also the whole As a result, there are cases where the shape is disordered and the density of the nonwoven fabric increases.
  • the heat treatment means for the nonwoven fabric in the present invention it is desirable to hold both ear ends of the aggregate of filament rafts accumulated on the conveyor and heat-treat at an appropriate heat treatment temperature.
  • the filament ridge is a flat nonwoven fabric.
  • it is flattened by embossing or hot pressing to form a nonwoven fabric.
  • such processing makes the nonwoven fabric harder and impairs the texture.
  • the heat treatment means of the present invention since the pressing action does not work on the flat surface, it is not only a soft and good texture but also a large porosity in the nonwoven fabric, and a good filter characteristic. It is very important not to impair this texture because the nonwoven fabric of the present invention is a nonwoven fabric made of ultrafine filaments, so that the good texture of ultrafine filaments is not lost by heat treatment. is there.
  • the aggregate of the flame candy accumulated on the compare is gripped by the front and rear nip rollers, and the heat treatment is performed at a reasonable temperature in a state where the grip interval is reduced.
  • the gripping interval is preferably 1 to 2 or less, more preferably 13 or less, and 1/5 or less of the width of the filament aggregate.
  • the heat treatment temperature at the time of producing the nonwoven fabric in the present invention is a heat treatment temperature for ordinary thermoplastic synthetic fibers.
  • the heating means of the heat treatment in the present invention hot air can be blown from the competitor, heating with an infrared heater, or a combination thereof can be used.
  • the apparatus can be simplified by using a thermal cylinder instead of the mesh conveyor, or by transferring the mesh conveyor from a mesh conveyor to a conveyor made of a thermal cylinder and using the gripping means on the thermal cylinder.
  • Nonwoven orientation of filaments Bok is the improvement of the present invention, full Iramento constituting the nonwoven fabric, when a polyethylene terephthalate, a double refraction is 2 0 X 1 CT 3 or more, preferably 3 0 X 1 0- 3 or more
  • Nonwoven fabric composed of highly molecularly oriented ultra-fine polyester filaments, characterized in that the fiber diameter is 8 microns or less, preferably 5 // m or less, most preferably 3 / m or less It can be.
  • Polyester is low in cost, has high heat resistance, and can increase strength and Young's modulus, so it is used in various industrial applications, not as garments, and by making it a highly molecular oriented ultrafine filament. Development is expected in more advanced applications.
  • Filaments constituting the nonwoven fabric of the present invention when a Poridarikoru acid or poly L-lactic acid or Ranaru broad biodegradable polymer, in birefringence 1 2 X 1 0- 3 or more, preferably 1 5 X 1 0_ 3
  • a highly molecularly oriented ultrafine material characterized in that the fiber diameter is 7 micrometer or less, preferably 5 m or less, most preferably 3 jum or less. It can be set as the nonwoven fabric which consists of a biodegradable polymer filament.
  • Biodegradable polymers can also be made flexible by increasing the fiber diameter, increasing the covering power and improving the degradability.
  • the strength and Young's modulus can be increased by improving the degree of orientation, the suitability for use in various applications could be increased. The invention's effect
  • the present invention can provide a long-fiber nonwoven fabric comprising ultrafine filaments that are highly molecularly oriented.
  • a meltblown nonwoven fabric as a nonwoven fabric made of ultrafine filaments in the city.
  • Shotama a small lump of resin
  • the non-woven fabric of the present invention is similarly composed of ultrafine filaments, but is composed of highly molecularly oriented filaments, which are strong and free of yachts and lumps.
  • the nonwoven fabric according to the present invention is characterized not only in that the filament is extremely fine, but also in the diameter of the flame candy. Ultra-fine and uniform filament diameter makes it a glossy non-woven fabric and improves various properties such as printability.
  • a nonwoven fabric by a spunbond method As a long-fiber nonwoven fabric, a nonwoven fabric by a spunbond method has been conventionally used, but it is not highly molecularly oriented as in the present invention, and the filament diameter is not suitable for making an ultrafine filament as in the present invention.
  • the melt blow method uses a large amount of hot air, and the spun pond method also uses a large amount of compressed air. However, in the present invention, the amount of air used is small, which is economical.
  • the nonwoven fabric of the present invention is It can be used as a high-performance filter by processing the tort.
  • the nonwoven fabric composed of the ultrafine filaments of the present invention is composed of polyethylene terephthalate-based filaments
  • the nonwoven fabric also has suitability as a medical nonwoven fabric such as a filter for removing leukocytes.
  • the present invention provides a nonwoven fabric comprising ultrafine filaments of biodegradable polymers and biodegradable absorbable polymers. Since the filament diameter is thin, the number of filaments per unit area is very large (proportional to the inverse of the square of the fiber diameter) and covering power increases. Further, the non-woven fabric made of the biodegradable ultrafine filament of the present invention also has features such as no lumps, uniform filament diameter, and high filament strength. Used as a non-woven fabric for agricultural use, as a non-woven fabric made of biodegradable polymer. The nonwoven fabric made of the biodegradable absorbable filament of the present invention is widely used for suture prosthetic materials, anti-adhesion materials, artificial skin caps, cell culture substrates, etc. Brief Description of Drawings
  • FIG. 1 is a conceptual diagram of a process for producing a nonwoven fabric comprising stretched filaments with improved orientation according to the present invention.
  • FIG. 2 is a conceptual diagram of a blower pipe used in the present invention.
  • FIG. 3 shows an example of the arrangement of guns for irradiating the original filament of the present invention with infrared rays from a plurality of locations.
  • FIG. 3A is a plan view and FIG. 3B is a side view.
  • Fig. 4 shows another example of irradiating the original filament raft of the present invention with infrared rays from a plurality of locations.
  • FIG. 5 is a chart showing the experimental results of a composite manufactured using non-woven polyethylene phthalate as the original filament.
  • Fig. 6 is a chart of the experimental results when conducted under conditions different from those in Fig. 5.
  • FIG. 7 is an electron micrograph of the ultra-fine nonwoven fabric obtained by the present invention (magnification of 500).
  • Figure 8 is a Chicago photomicrograph (magnification 1 5 0 0) 0
  • Figure 9 ultrafine nonwoven fabric obtained in the present invention, an electron microscopic ⁇ photograph commercial meltblown nonwoven fabric (magnification 3, 5 0 0).
  • Fig. 10 is a table of experimental results when a non-woven fabric was produced using poly-L-lactic acid polymer as the original filament.
  • Fig. 11 is a chart showing the experimental results when a non-woven fabric was produced using polyglycolic acid polymer as the original filament.
  • Fig. 12 is an electron micrograph of the ultra-fine nonwoven fabric obtained from the experimental results shown in Fig. 11 (magnification, a is 1, 000 times, b is 1, 5,000 times).
  • FIG. 1 is a conceptual diagram showing an example of a nonwoven fabric manufacturing apparatus according to the present invention.
  • a number of original filaments 1 are wound on reel 1 1 and attached to frame 1 2 (only 3 are shown for the sake of simplicity).
  • These original filaments 1a, 1b, 1c are guided by the rotation of the feeding nip rolls 14a, 14b through the snail fillers 13a, 13b, 13c, which are guides.
  • the fed original filament 1 is heated by the line-shaped infrared light flux emitted from the infrared radiation device 15 in the process of descending by its own weight.
  • the range of the heating part N due to the infrared light beam during the travel of the original filament 1 is shown by hatching.
  • the light beam that has passed through the original filament 1 without being absorbed is reflected by the concave surface 16 shown by the dotted line and returned to the heating part N to be condensed.
  • a concave surface ⁇ is also provided on the infrared radiation device 15 side (however, a window is opened at the advancing portion of the light beam from the infrared radiation device), but it is omitted in the figure.
  • the original filament 1 is heated by the radiant heat of the infrared rays in the heating part N, and passes through the blower pipe 21 provided below that part. Then, the stretching tension is controlled by the air velocity of the air in the blower pipe, so that the stretched filaments 17a, 17b, 17c are collected on the traveling conveyor 18 and the web 1 9 is formed. From the back of the competitor 18, air is sucked in the direction of the arrow d by negative pressure suction, which contributes to the stability of the web 19 travel. The negative pressure d is pulled by the tension exerted on the drawn filament 17 and contributes to the thinning and orientation of the filament, and these tensions are also considered as part of the drawing tension of the present invention.
  • the reels 1 1 of the original filament 1 are installed in multiple stages in the direction of travel of the conveyor 1 8, and the web 1 1 9 is designed to increase productivity. It should be noted that the infrared radiating device 15 and the four-sided plate 16 can be used for several stages, as shown in FIG.
  • the original filament 1 is heated by the infrared radiation device 15 to become a stretched filament 17, and then passed through the blower tube 1 2, so that a constant tension is obtained.
  • the drawn filament 17 is given air in a certain wind speed range. With this constant wind speed, the filaments are most highly oriented and are accumulated on the competitor 18 with the highest draw ratio.
  • FIG. 2 shows an example of the air duct used in the present invention.
  • the air introduced by arrow a joins the main pipe 2 2 through the branch pipe 2 3 in the main pipe 2 2 through which the stretched filament 17 passes.
  • Fig. B shows a double tube 24 with a hollow inside, and the air introduced from the arrow b is guided to the filament passage through a number of holes 25 formed in the inner wall of the double tube.
  • Fig. C shows an example of a nozzle used as an air entanglement nozzle 26 used for interlace spinning. Air is blown from both sides c 1 and c 2.
  • Fig. D shows a conceptual diagram with a partial cross section showing an example of a blower pipe 27 through which a number of flame ridges are blown simultaneously.
  • the air that has been introduced into the filament inlet 28 of the filament traveling direction F and guided from the direction A is air sent in from the inlet 29 of the air.
  • the nozzle shown in FIG. C can be used for interlace cutting after stretching according to the present invention.
  • the blast pipe of FIG. 1 shows an example of a closed type, a part of it is released and a groove-shaped one can be used.
  • FIG. 3 shows an example of means for irradiating the original filament from a plurality of locations with the infrared light beam employed in the present invention.
  • Figure A is a plan view and Figure B is a side view.
  • the infrared light beam 3 1 a irradiated from the infrared irradiator passes through the region P (in the dotted line) of the original filament 1 and reaches ⁇ 3 2 and is reflected by ⁇ 3 2 and the infrared light beam 3 1 b Nari, ⁇ 3 3 Is reflected to produce an infrared luminous flux 3 1 c.
  • the infrared light beam 3 1 c irradiates the original filament through the region P after 120 degrees from the irradiation position of the first original filament.
  • the infrared light beam 3 1 c that has passed through the region P is reflected by ⁇ 3 4 and becomes an infrared light beam 3 1 d, and is reflected by ⁇ 3 5 and becomes an infrared light beam 3 1 e.
  • Infrared luminous flux 3 1 ⁇ passes through region P and irradiates original filament 1 to the irradiation position of the first original filament beam after 120 degrees opposite to infrared luminous flux 3 1 c.
  • the original filament 1 can be heated uniformly from a symmetrical position by 120 degrees by the three infrared light beams 3 1 a, 3 1 c, and 3 1 e.
  • FIG. 4 is a plan view showing an example of using a plurality of light sources as another example of means for irradiating the original filament from a plurality of locations with the infrared light flux employed in the present invention.
  • the infrared luminous flux 3 7 a radiated from the infrared radiation device is radiated to the original filament 1.
  • an infrared luminous flux 3 7 b emitted from another infrared emitting device is also emitted to the original filament 1.
  • an infrared luminous flux 37c emitted from another infrared emitting device is also emitted to the original filament 1.
  • a prototype of non-woven fabric was made.
  • the laser oscillator at this time was manufactured by Onizuka Glass Co., Ltd., and a carbon dioxide laser oscillator with a maximum output of 1 OW was used.
  • a spot radiation device was used in this example, and the laser power density was 17.8 W cm 2 and the beam diameter was 4. Omm.
  • FIG. 5 shows the results of an experiment conducted by changing the amount of air fed into the blower tube at a feed rate of 0.28 mZ for the original filament.
  • a blower pipe having an inner diameter of 12 mm and a length of 11 Omm was used.
  • the air flow rate is 20 LZ
  • wind speed conversion is 2.9 mZs ec, that is, from about 3 mZ
  • 40 L min wind speed is 5.9 m / sec, that is, about 6 mZ
  • the filament diameter is 10 microns.
  • the birefringence also increases. However, after 40L, the filament diameter increases and the birefringence decreases.
  • the draw ratio is 100 times or more
  • the nonwoven fabric is made of filaments drawn to 500 times or more and even 1000 times or more.
  • Fig. 6 shows the results of experiments with varying the delivery speed in the range of air volume 101_ / min, which is considered to be the optimum wind speed range, from 2.9 m / sec, wind speed conversion of 2.9 m / sec to 30 L min, wind speed conversion of 4.4 mZs ⁇ o. Show. From this figure, it can be seen that the filament diameter is very fine, 3-4 microns. Further, in a birefringent 20X 10- 3 or more, and the longitudinal 30X 10_ 3, it can be seen that is also up orientation. From Fig. 5 and Fig.
  • the polyethylene terephthalate filament has a wind speed range of 1.5 mZs ec or more and 10. msec or less. It is understood that it is most preferably 2 m / sec or more and 7 msec or less, and 3 mZsec or more and 6 m / sec or less.
  • the nonwoven fabric according to the present invention is also characterized by being free of lumps and having a very uniform filament diameter.
  • Figures 7 and 8 show micrographs of the nonwoven fabric obtained by the present invention.
  • Fig. 9 shows a SEM photograph of a commercially available Meltobu mouth non-woven fabric. The stretching tension at this time was estimated from the batch method of the prior application (Japanese Patent Laid-Open No. 2003-166115), and was 0.48 MPa at a cutting speed of 180 OmZ and 0.41 MPa at 2000 mZ. It was. The measurement of the strength and elongation, etc., was in accordance with JISL 1015.
  • Example 2 Japanese Patent Laid-
  • Example 1 the conveyor mesh? ⁇ The web accumulated on top was heat-treated by gripping both ends of the web on the conveyor and blowing hot air at 190 ° C. Before the heat treatment, the cotton-like web aggregate was completely flattened by the heat treatment.
  • the physical properties of the nonwoven fabric obtained by the heat treatment were Young's modulus of 0.43 GPa, tensile strength of 2.7 GPa, and elongation of 28%.
  • the commercially available melt blown non-woven fabric had a Young's modulus of about 0.004 GPa, two orders of magnitude smaller, a high elongation of 97% and low dimensional stability, and a tensile strength of about 3.5 GPa.
  • the measurement of the strength and elongation, etc. was based on JI S L 1085.
  • an unstretched filament (filament diameter 1 10 im) made of ZS) was used. Using this raw filament, a non-woven fabric was prototyped under the same conditions as in Example 3. Air volume 10 LZ, which is considered to be the optimum wind speed range, converted from wind speed 2.29 m / sec to 40 L / min, converted to wind speed 5.9 m s ec Shown in Fig. 1. The filament diameter is 3 to 7 microns. It can be seen that the degree of orientation is also increased to around 2 0 X 10 ⁇ 3 . Under these preferable conditions, the nonwoven fabric is made of a filament stretched at a draw ratio of 100 times or more, 500 times or more, and further 100 times or more. In addition, the nonwoven fabric according to the present invention is also characterized by being free of lumps and having a very uniform filament diameter. A micrograph of the nonwoven fabric obtained by the present invention is shown in FIG.
  • the nonwoven fabric according to the present invention is used as a nonwoven fabric for packaging, a filter, clothing, etc., particularly for medical non-woven fabrics for separating white blood cells, and the nonwoven fabric comprising the stretched biodegradable filament of the present invention is Nonwovens made of biodegradable and absorbable filaments are used as anti-adhesion materials.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

La présente invention concerne un procédé pratique de fabrication de tissu non tissé de filament ultrafin, qui présente une orientation moléculaire élevée, par l'intermédiaire de moyens simples et faciles à partir de tous types de polymères thermoplastiques sans la nécessité d’utiliser un quelconque appareil spécial de haute précision/haut niveau. En particulier, un procédé de fabrication de tissu non tissé de polymère absorbé décomposé in vivo ou polymère biodégradable dont l’aptitude à l’étirage est mauvaise est prévu, ledit procédé consistant à chauffer des filaments écrus par l'intermédiaire de faisceaux infrarouge, à les étirer sous régulation de tension en utilisant un tuyau à soufflage, et à les empiler sur un convoyeur.
PCT/JP2006/303090 2005-02-16 2006-02-15 Procede de fabrication de tissu non tisse de filament ultrafin WO2006088213A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112481708A (zh) * 2019-09-11 2021-03-12 宁波国际材料基因工程研究院有限公司 一种高通量聚合物纤维制备设备及其制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6334194U (fr) * 1986-08-22 1988-03-04
JP2001192932A (ja) * 1999-12-28 2001-07-17 Kuraray Co Ltd 極細繊維
JP2004107851A (ja) * 2002-09-17 2004-04-08 Yamanashi Tlo:Kk 延伸されたフィラメントの製造方法およびその製造装置および高度に分子配向した極細フィラメント

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Publication number Priority date Publication date Assignee Title
JPS6334194A (ja) * 1986-07-30 1988-02-13 日立マクセル株式会社 Ｉｃカ−ド用基板
JP3918987B2 (ja) * 2001-08-27 2007-05-23 株式会社山梨ティー・エル・オー 極細繊維、その製造方法及び製造装置
JP4081554B2 (ja) * 2003-03-07 2008-04-30 国立大学法人山梨大学 延伸された芯鞘型フィラメント

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS6334194U (fr) * 1986-08-22 1988-03-04
JP2001192932A (ja) * 1999-12-28 2001-07-17 Kuraray Co Ltd 極細繊維
JP2004107851A (ja) * 2002-09-17 2004-04-08 Yamanashi Tlo:Kk 延伸されたフィラメントの製造方法およびその製造装置および高度に分子配向した極細フィラメント

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112481708A (zh) * 2019-09-11 2021-03-12 宁波国际材料基因工程研究院有限公司 一种高通量聚合物纤维制备设备及其制备方法

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