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
  • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
  • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
  • D01F8/14—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyester as constituent
• • 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
  • D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
  • D01D5/30—Conjugate filaments; Spinnerette packs therefor
  • D01D5/34—Core-skin structure; Spinnerette packs therefor
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
  • D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
  • D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
• • 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
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
• • 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
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
  • D04H1/541—Composite fibres, e.g. sheath-core, sea-island or side-by-side; Mixed fibres
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
  • Y10T428/2913—Rod, strand, filament or fiber
  • Y10T428/2929—Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/637—Including strand or fiber material which is a monofilament composed of two or more polymeric materials in physically distinct relationship [e.g., sheath-core, side-by-side, islands-in-sea, fibrils-in-matrix, etc.] or composed of physical blend of chemically different polymeric materials or a physical blend of a polymeric material and a filler material
  • Y10T442/641—Sheath-core multicomponent strand or fiber material

Definitions

• the present invention relates to a self-extensible thermoadhesive conjugate fiber having a low modulus, self-extendability during thermal bonding, and exhibiting a soft texture when formed into a heat-bonded nonwoven fabric, and a method for producing the same. .
• heat-adhesive composite fibers represented by core-sheath type heat-adhesive composite fibers with a heat-adhesive resin component as the sheath and a fiber-forming resin component as the core are produced by the card method, airlaid method, wet papermaking method, etc. After forming the fiber web, it is used as a non-woven fabric by melting the heat-adhesive resin component by hot air dryer treatment or hot roll treatment to form an interfiber bond.
• an adhesive using an organic solvent as a solvent is not used, the amount of emission of harmful substances such as an organic solvent is small.
• fiber structures such as fiber cushions and bed mats have been widely used for non-woven fabric applications.
• the nonwoven fabric may be in direct contact with the skin, so the nonwoven fabric has flexibility and drapeability like cloth, and paper It is required to have moderate bulkiness that is not like.
• Nonwoven fabrics having such characteristics have been continuously studied.
• thermocompression-bonded and softened or melted by a joint or the like One method of thermally bonding webs obtained from heat-bonding fibers is a heat roll method in which a portion of the web is thermocompression-bonded and softened or melted by a joint or the like.
• the nonwoven fabric is easily bent at the boundary between the thermocompression bonding region and the non-thermocompression bonding region, and the resulting nonwoven fabric is obtained. Is excellent in drape.
• the fibers in the thermocompression bonding area are flattened by crimping, the crimped part becomes hard and the bulkiness of the nonwoven fabric is lost, and the resulting nonwoven fabric has a paper-like feel.
• another method for thermally bonding a web obtained from thermally adhesive fibers is an air-through method in which hot air is blown over the entire web to soften or melt the intersections of the fibers.
• hot air is passed while leaving a certain amount of bulk of the web, so the obtained nonwoven fabric is bulky, the obtained nonwoven fabric does not have a region that becomes partially hard, and the surface touch is smooth. It becomes.
• irregular folds are likely to appear on the non-woven fabric, resulting in a non-woven fabric with poor drape.
• Patent Document 1 discloses the following method. That is, by setting the orientation index of the heat-adhesive resin component to 25% or less and the orientation index of the fiber-forming resin component to 40% or more by high-speed spinning, the adhesion point strength is strong, and the fusion index is melted at a lower temperature. A heat-adhesive conjugate fiber that is attached and has a low heat shrinkage rate is obtained. This is a technique for producing a nonwoven fabric having drapeability and bulkiness and having sufficient nonwoven fabric strength by adhering a mixed cotton web of the heat-adhesive conjugate fiber and non-thermal adhesive fiber by an air-through method.
• the current short fiber manufacturing process is still not sufficiently stable and the yield is poor. Furthermore, considering the performance of the obtained short fibers, the cost performance is not sufficient, and it can be said that there are still many difficult issues for commercial production of short fibers by the high-speed spinning method. Furthermore, when a heat-bonding nonwoven fabric is formed with a heat-adhesive conjugate fiber alone, the number of bonding intersections in the non-woven fabric increases, so it is difficult to obtain a non-woven fabric with a soft texture and poor drapeability. There is a tendency to obtain a woven fabric. Therefore, in general, nonwoven fabrics are manufactured by blending non-thermal adhesive fibers in order to reduce the number of bonding intersections. In this case, the nonwoven fabric strength tends to decrease because the number of bonding intersections in the nonwoven fabric decreases. is there. Therefore, the nonwoven fabric has a sufficient level of strength and soft texture. It wasn't.
• a fiber-forming resin component is a composite fiber constituting a core component and the core component is polyethylene terephthalate (hereinafter referred to as PET) is shown in Patent Document 1 as an example. Is not disclosed.
• PET polyethylene terephthalate
• the melting point of the core component is higher than the melting point of the sheath component, compared to when the core component of the thermoadhesive conjugate fiber is polypropylene (hereinafter referred to as PP). Since it can be made sufficiently high, the thermal bond strength of the resulting nonwoven fabric can be further improved.
• a composite fiber having such a core component as PET has a relatively high rigidity, and thus has a potential to obtain a bulkier nonwoven fabric.
• a nonwoven fabric is produced using a composite fiber that has been subjected to a low-strength stretching treatment as described in Patent Document 1 or a simple fiber that has not yet been stretched, the oriented crystallinity of the core component of the composite fiber used is not satisfactory. The thermal shrinkage was large because it was sufficient.
• high-speed spinning as described in Patent Document 1 is applied to a composite fiber whose core component is PET, in order to prevent the core component from solidifying rapidly, the core component of the composite fiber during spinning is used.
• the melting temperature of the sheath component of the composite fiber must be increased in accordance with the melting temperature. As a result, the polymer constituting the sheath component deteriorated and the spinning draft was large, and there was a problem that yarn breakage was very likely to occur during spinning.
• Patent Document 1 Japanese Patent Application Laid-Open No. 2 0 0 5-3 5 0 8 3 6 Disclosure of Invention
• the present invention has been made against the background of the above-described prior art.
• the purpose of the present invention is to use polyethylene terephthalate as a fiber-forming resin component, a high adhesive strength, a bulky and good drapeability.
• Another object of the present invention is to provide a low-modulus self-extensible thermoadhesive conjugate fiber that can produce a fiber structure. Means for solving the problem
• thermoadhesive resin component As a result of intensive studies to solve the above-mentioned problems, the present inventors used a crystalline thermoplastic resin having a melting point 20 ° C. lower than that of PET as the thermoadhesive resin component.
• the unstretched yarn taken at a spinning speed of 0,00 m / min or less is cold-stretched 1.05 to 1.30 times while being unheated or cooled in a refrigerant, and then the glass transition of the thermoadhesive resin component It has high adhesive strength, sufficient bulkiness, and draping properties by relaxing relaxation heat at a temperature 1 ° C or higher than both the glass transition point of the resin component and the fiber-forming resin component.
• the inventors have invented a low-modulus self-stretching thermoadhesive conjugate fiber as a resin component.
• the above problem is a composite fiber composed of a fiber-forming resin component and a heat-adhesive resin component, wherein the fiber-forming resin component is made of polyethylene terephthalate (PET), and the heat-adhesive resin component is a fiber forming component.
• PET polyethylene terephthalate
• the heat-adhesive resin component is a fiber forming component. It consists of a crystalline thermoplastic resin having a melting point 20 ° C or more lower than the resin component, and has a breaking elongation of 130-600% and a tensile stress of 0.3-1 .Oc N / dte X, 120 ° C.
• This can be solved by the invention of a self-extensible thermoadhesive conjugate fiber characterized by a dry heat shrinkage of less than ⁇ 1. 0%.
• the above-mentioned problem is that the unstretched yarn of the composite fiber taken up at a spinning speed of 1300 m / min or less is cold-drawn 1.05 to 1.30 times and then the glass transition point of the thermoadhesive resin component.
• This can be solved by the invention of a method for producing a heat-adhesive conjugate fiber, characterized by relaxing heat shrinkage at a temperature higher by 10 ° C. or more than both glass transition points of the fiber-forming resin component.
• the non-woven fabric produced using the low modulus self-extensible thermoadhesive conjugate fiber of the present invention does not require the operation of reducing the bonding intersection by blending non-thermoadhesive fibers. It exhibits a soft texture based on its low modulus characteristics and self-extension. At the same time, the non-woven fabric maintains the high adhesive strength unique to heat-bonded non-woven fabrics composed of thermoadhesive conjugate fibers alone.
• the present invention is a composite fiber composed of a fiber-forming resin component and a heat-adhesive resin component. More specifically, a low-modulus self-extensible heat having a fiber-forming resin component as PET and a crystalline thermoplastic resin having a melting point 20 ° C. lower than PET as its heat-adhesive resin component. Adhesive conjugate fiber.
• the fiber-forming resin component also melts in the process of melting and adhering the heat-adhesive resin component. This is preferable because the fiber structure cannot be manufactured.
• the range of the melting point difference is preferably 20 to 180 ° C.
• This composite fiber is prepared by using a known composite fiber melting method or a die, and a spinning speed of 100-! Obtained unstretched yarn with SOO mZm in, then cold-drawn 1.05 to 1.30 times, and further composed of PET glass transition point (hereinafter referred to as Tg) and thermal adhesive resin component 10 ° C or higher than both Tg of the thermoplastic crystalline resin to be used, a temperature of 1 ° C or lower than the melting point of the thermoadhesive resin component, preferably 20 ° C or higher than their Tg, It can be obtained by relaxing heat shrinkage treatment at a temperature of 20 ° C.
• the temperature higher than both Tg of PET and Tg of thermoplastic crystalline resin, which is a thermoadhesive resin component, is often higher than Tg of PET (about 70 ° C). It becomes temperature. Therefore, it is preferable to perform the relaxation heat shrinking treatment at a temperature of 80 ° C or higher, preferably 90 ° C or higher. A more preferable temperature is 100 ° C or higher.
• the temperature during the relaxation heat shrink treatment can be performed in hot air or warm water. In the present invention, since the melting point of the crystalline thermoplastic resin constituting the heat-adhesive resin component is 20 ° C.
• thermoplastic crystallinity constituting the heat-adhesive resin component This is because the Tg of the resin is often lower than that of PET. If the temperature of the relaxation heat shrink treatment is lower than this temperature range, Since the shrinkage rate at the time of wearing becomes large, it is not preferable. If the temperature of the relaxation heat shrink treatment is too high above this temperature range, the resin of the thermoadhesive resin component may soften and become pseudo-glue. Relaxing heat shrinkage treatment is 0.5 to 0.8 times 5 times so that no tension is applied in hot water, even if the tow is passed through hot air with no tension applied after stretching. A method of feeding may be used.
• the fiber having a low magnification drawing is formed to have a crystal having a crystal axis inclined in a random direction from the fiber axis direction while shrinking in the fiber axis direction due to residual strain. Furthermore, when the temperature is applied to the fiber, the crystal size of the crystal increases, and the crystal size further increases even if the crystals existing close to each other come into contact with each other. For this reason, a phenomenon occurs in which the fibers appear to be stretched. This phenomenon is called self-extension, and the composite fiber of the present invention exhibits this self-extension.
• the self-elongation rate increases when the draw ratio exceeds 1.0 times, and the self-elongation ratio becomes maximum at a draw ratio of 1.20 times.
• the point is how to arrange the crystal direction at random with respect to the fiber axis before crystal thickening, so the fiber contracts greatly before crystallization. It is thought that it should be done.
• cold drawing at a temperature 1.05 to 1.30 times lower than the drawing temperature during the hot drawing operation using hot water, steam, or a plate type heater in the fiber drawing process. If you apply The residual strain of the amorphous part can be increased while suppressing orientational crystallization by stretching, which is suitable for obtaining the conjugate fiber of the present invention.
• “cold rolling” includes not only stretching at room temperature but also stretching in an atmosphere that is actively cooled to a temperature below room temperature. Specifically, a method of stretching in a non-heated state at room temperature or in a refrigerant cooled to room temperature or lower can be mentioned. More specifically, a method of cold drawing in air, a method of drawing in a cold water bath, and the like can be preferably exemplified.
• the refrigerant is inert to the fiber-forming resin component and the heat-adhesive resin component forming the composite fiber of the present invention, in addition to air and water, and swells and dissolves.
• Noble gases, nitrogen, carbon dioxide, or other gases, or liquids such as various oils that are not soluble in PET and the thermoadhesive resin component can be appropriately selected.
• the temperature of the refrigerant at the time of cold drawing can be 0 to 30 ° C, preferably 10 to 25 ° C.
• the self-elongation rate at 120 ° C of the composite fiber exceeds 1.0%, that is, the dry heat shrinkage rate at 120 ° C of the composite fiber is less than 1.0%, and the 100% of the composite fiber.
• the draw ratio needs to be in the range of 1.05 to 1.30 times. When the draw ratio is less than 1.05 times, the tensile strength at 100% elongation is 1.0 c N / dte X or less, but the self-elongation rate is less than 1.0%. I can't do it. If the draw ratio exceeds 1.30 times, the tensile strength at 100% elongation will exceed 1.
• the stretching temperature is preferably as low as possible.
• cold water is used as the refrigerant, it is particularly preferably set to 0 ° C. or more and 25 ° C. or less. Performing the drawing operation at such a low temperature can suppress crystallization due to orientation and heat generation by gradually heating the heat generated from the composite fiber during drawing, so that the heat shrinkage rate of the obtained composite fiber can be suppressed.
• the 100% elongation stress should be 0.3 to 1. O c NZ dtex. If the tensile stress is less than 0.3 c N / dtex, the strength of the nonwoven fabric tends to be insufficient and the texture of the nonwoven fabric tends to deteriorate. It becomes inferior to (drapability) and is not preferable.
• the spinning speed needs to be 1300 m / min or less, preferably 1200 m / min or less, more preferably 100-1 1 0 0 m / min.
• the spinning speed exceeds 1300 m / min, the orientation of the undrawn yarn increases, but the effect of developing a high self-elongation ratio by low-stretch drawing operation, which is a characteristic of the composite fiber of the present invention, is reduced. .
• the form of the low-modulus self-extensible thermoadhesive conjugate fiber of the present invention may be a conjugate fiber in which a fiber-forming resin component and a thermoadhesive resin component are bonded together in a so-called side-by-side type. It may be a core-sheath type composite fiber in which the forming resin component is a core component and the heat-adhesive resin component is a sheath component.
• the core-sheath type composite fiber include a concentric core-sheath type composite fiber and an eccentric core-sheath type composite fiber.
• thermoadhesive resin component it is necessary to select a crystalline thermoplastic resin.
• a crystalline thermoplastic resin the molecular chains that are oriented at the time of spinning shrink significantly as they become non-oriented at the same time as melting.
• the crystalline thermoplastic resin include a polyolefin resin and a crystalline copolymer polyester.
• polyolefin resin examples include crystalline polyolefin resins such as crystalline polypropylene, high density polyethylene ', medium density polyethylene, low density polyethylene', and linear low density polyethylene.
• the crystalline thermoplastic resin constituting the thermoadhesive resin component is Tylene, propylene ', 1 pentene, 1 pentene, or acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, isocrotonic acid, mesaconic acid, citraconic acid or hymihydrate Copolyolefins obtained by copolymerizing at least one of succinic acid or unsaturated compounds composed of these esters or acid anhydrides with the above polyolefin may be used.
• Examples of the crystalline copolyester used as the heat-adhesive resin component are preferably the following polyesters.
• unsubstituted or sulfone such as isophthalic acid, naphthalene-1,2,6-dicarboxylic acid, sodium 5-sulfoisophthalate, or 5-sulfoisophthalic acid, is added to an ano- ylene terephthalate.
• Aromatic dicarboxylic acids with acid groups aliphatic dicarboxylic acids such as adipic acid or sebacic acid, alicyclic dicarboxylic acids such as 1,4-cyclohexamethylenedicarboxylic acid, 0) -hydroxyalkylcarboxylic acids Polyesters obtained by copolymerizing aliphatic diols such as polyethylene glycol or polytetramethylene glycol, or alicyclic dienoles such as hexamethylene-1,4-dimethanol so as to exhibit a desired melting point be able to.
• the alkylene terephthalate contains terephthalic acid or its ester-forming derivative as the main dicarboxylic acid component, and ethylene glycolone, diethyleneglycolole, trimethylenglycol, tetramethylene glycol, hexane as the main diol component. Mention may be made of polyesters obtained by using as raw materials one to three combinations of methylene glycol or derivatives thereof.
• the ester-forming derivative include lower dialkyl esters having 1 to 6 carbon atoms and lower diaryl esters having 6 to 10 carbon atoms.
• Preferred ester-forming derivatives are dimethyl esters or diphenyl esters.
• the copolymerization rate of these components exhibits the desired melting point, and it is desirable to adjust variously depending on the copolymerization component. Mole% is preferred.
• the heat-adhesive resin component is a fiber-forming resin component of PE
• two or more types of crystalline thermoplastic resins whose melting point is 20 ° C or more lower than that of PET may be in the form of polymer blends, and amorphous thermoplastic resins as long as adhesion and low heat shrinkage are not significantly impaired.
• a crystalline thermoplastic resin having a melting point difference from PET of less than 20 ° C. may be contained.
• the elongation at break of the low-modulus self-extensible thermoadhesive conjugate fiber of the present invention needs to be in the range of 1300 to 600%, preferably 1700 to 4500%. It is within the range.
• the breaking elongation of the composite fiber of the present invention is less than 130%, the orientation of the heat-adhesive resin component is high, so that the adhesiveness is inferior and the nonwoven fabric strength is lowered.
• the breaking elongation of the composite fiber of the present invention exceeds 600%, the strength of the composite fiber is substantially decreased, and the strength of the heat-bonded nonwoven fabric cannot be increased.
• the method for controlling the breaking elongation of the composite fiber within the range of 130 to 60% depends on the type of polymer to be combined and the melt viscosity, but the hole diameter of the nozzle that discharges the polymer is spun.
• One way is to select the speed appropriately.
• the main effect is to select the spinning speed appropriately.
• the spinning speed is preferably in the range of 100 to 1300 m / min, depending on the type and combination of the polymers. If the spinning speed is increased, the breaking elongation can be decreased, and if the spinning speed is decreased, the breaking elongation can be increased. '
• the low modulus self-extensible thermoadhesive conjugate fiber of the present invention has a feature that the 120 ° C. dry heat shrinkage rate is less than 1.0%.
• the lower limit of the dry heat shrinkage rate is not particularly limited, but about 12.0% is estimated as the lower limit.
• Thermal bonding When manufacturing nonwoven fabrics, the composite fibers self-elongate before thermal bonding, which increases the thickness in the thickness direction.
• the low-modulus fibers are oriented in the thickness direction in the nonwoven fabric. Therefore, when compression in the thickness direction is taken into consideration, it becomes a soft texture, and when used as a surface material for sanitary materials, the feeling of pressure in the vertical direction to the skin is reduced, and drapability is also good Become.
• the fiber cross section of the conjugate fiber is preferably a concentric core-sheath type cross section or an eccentric core-sheath type cross section.
• the web shrinks more because the three-dimensional crimp appears when the web is formed.
• the adhesive strength of the web is reduced, and the effect aimed by the present invention can be somewhat reduced.
• the fiber cross section of the composite fiber may be a solid fiber or a hollow fiber, and is not limited to a round cross section, but is a multi-leaf type cross section such as an elliptical cross section or a 3-8 leaf cross section.
• the multi-leaf type cross section represents a cross-sectional shape having a plurality of convex portions such that the leaves extend from the central portion in the outer peripheral direction.
• the fineness of the conjugate fiber may be selected according to the purpose and is not particularly limited, but is generally used in the range of about 0.01 to 500 decitex. This fineness range can be achieved by setting the diameter of the die through which the resin is discharged during spinning to a predetermined range.
• the composite ratio of the fiber-forming resin component and the heat-adhesive resin component is not particularly limited, but is selected according to the requirements for the strength, bulk, or heat shrinkage rate of the target nonwoven fabric or fiber structure. It is preferable that the ratio of the fiber-forming resin component and the heat-adhesive resin component is about 10 .Z 90 to 90/10 by weight.
• the form of the fiber can be any form such as multifilament, monofilament, staple fiber, chop or tow.
• the heat-adhesive conjugate fiber of the present invention is particularly effective in improving the drapability in a random nonwoven fabric having a fiber structure. Therefore, the self-extensible thermoadhesive conjugate fiber of the present invention can be used to produce a non-woven fabric composed of it alone. If necessary, it may be mixed with other fibers to produce a nonwoven fabric.
• the card method, air A lay method, wet papermaking method, etc. are used to form a web, and this is heated in a hot air dryer or with an emboss roll to heat-bond the fibers together. An excellent flexible heat-bondable nonwoven fabric can be obtained.
• the intrinsic viscosity of the polyester was determined at 35 ° C according to a conventional method after weighing a certain amount of the polymer and dissolving it in 0_chlorophenol at a concentration of 0.012 gm1.
• the melt flow rate was measured according to Japanese Industrial Standard K 1 7 2 10 0 condition 4 (measurement temperature 190 ° C, load 2 1.1 8 N).
• the maleolate flow rate is a value measured using a polymer pellet before melt spinning as a sample.
• the melting point and glass transition point of the polymer were measured at a temperature increase rate of 20 ° C. using a thermal analyst 220, manufactured by TA Instruments Japan Co., Ltd.
• the fineness of the composite fiber was measured by the method described in Japanese Industrial Standard L—1 0 1 5: 2 0 0 5 8.5.1 Method A.
• the composite fiber of the present invention is 100% elongated in strength and elongation due to the efficiency of constant-length heat treatment Since stress tends to fluctuate, it is necessary to increase the number of measurement points when measuring strength and elongation and 100% elongation stress with a single yarn. Since the number of measurement points is preferably 50 or more, here the number of measurement points is 50 and each value is defined as the average value. In addition, it was possible to measure 100% elongation stress by reading the stress at the time of elongation 1 ° 0% of the load-strain curve when measuring the strength and elongation.
• the 120 ° C. dry heat shrinkage of the composite fiber was measured at 120 ° C. in accordance with Japanese Industrial Standard L 1 10 15: 2 0 0 5 8. 15 b).
• the area shrinkage of the composite fiber tube was measured by the following method.
• a card web having a basis weight of 30 g g / m 2 made of 100% heat-adhesive composite short fibers cut to a fiber length of 51 mm was prepared, and the web was cut into 25 cm squares.
• the cut web was left for 2 minutes in a hot air dryer (Satake Chemical Machinery Co., Ltd. hot air circulating constant temperature dryer: 4 1 -S 4) maintained at 150 ° C for heat treatment, and then combined.
• the fibers were thermally bonded together.
• the area A i was calculated by measuring the vertical and horizontal dimensions of the web after thermal bonding and multiplying it, and the area shrinkage rate was calculated by the following formula.
• a test piece having a width of 5 cm and a length of 20 cm was cut out from the web (thickness 5 mm) obtained by the above-described method in the machine direction (fiber or web flow direction of the nonwoven fabric manufacturing process).
• the tensile strength was measured at a grip interval of 10 cm and an elongation rate of 20 cmZm i ⁇ .
• the adhesive strength was a value obtained by dividing the tensile breaking force by the weight of the test piece. (1 0) Flexibility (cantilever value)
• test piece with a width of 2.5 cm and a length of 25 cm was cut in the machine direction from the heat-bonded web (thickness 5 mm) obtained by the above-mentioned method, and the Japanese Industrial Standard L— 1 0 8 6: 1 9 8 3 6. 1 Measured by the method of 2.1. The cantilever value only in the machine direction was shown.
• the specific method for measuring the force inch lever value is as follows. In other words, a test piece cut out along a table was placed on a flat surface with a smooth surface and a 45 ° slope at one end. Next, accurately align one end of the test piece with one end on the slope side of the horizontal platform (the 45 ° slope and horizontal platform joint), and position the other end of the test piece on the 45 ° slope side. Measure as the length from one end. Since the length of the specimen is 25 cm, this value is 25 cm. Next, gently slide the test piece in the direction of the slope using an appropriate method, and when the center point of one end of the test piece reaches the same plane as the slope, the position of the other end is set to the 45 degree slope. Measure as the length from one end of the side.
• This value is measured value A.
• the difference between 2 5 cm and this measured value A is the cantilever value.
• Each test piece was measured on the front and back of 5 pieces, and the average value was taken as the cantilever value of the test piece. The larger the cantilever value, the harder the specimen, and the worse the drapeability of the specimen. The smaller the force cantilever value, the softer the specimen and the better the drapeability of the specimen.
• PET Polyethylene terephthalate
• IV 0.64 d LZ g
• T g 70 ° C
• the sheath component thermal adhesive resin
• HD PE High-density polyethylene
• the core component weight ratio and the sheath component weight ratio are 50 wt% using a known core / sheath composite fiber die.
• Composite fiber is formed so that the weight ratio is 50 wt%, discharge rate 0.70 g, 'mi hole, spinning speed 1 1 50 mm Spinning was performed under the in condition to obtain an undrawn yarn.
• the undrawn yarn was cold-drawn by 1.20 times, and then cold-drawn into an aqueous solution of oil containing 80 wt%: 20 wt% of lauryl phosphite tocalium salt and polyoxyethylene-modified silicone.
• the yarn was dipped and a mechanical crimp of 11 pieces / 25 mm was applied using a push-in type clamper with a stuffed inner box.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 6.4 dtex, strength 0.76 c N / dtex, elongation 4 4 2%, 10 0% elongation stress 0.3 7 c NZ dte X, 1 20 ° C Dry heat shrinkage rate-2.6%.
• Example 1 and Example 1 except that the undrawn yarn obtained in Example 1 was stretched 2.5 times in warm water at 70 ° C. and then stretched 1.2 times in 90 ° C. warm water.
• a composite fiber was produced under the same conditions.
• the resulting heat-adhesive conjugate fiber has a single yarn fineness of 2.6 dtex, strength of 2.49 c N dtex, elongation of 37.1%, 120 ° C dry heat shrinkage of 2.5%. Hot. Since the elongation of the heat-adhesive conjugate fiber was less than 100%, the 10% elongation stress could not be measured.
• the web area shrinkage of 100% of this heat-adhesive conjugate fiber is 5%, the nonwoven fabric strength is 20.5 kg, the cantilever value is 12.90 cm, and 7 pieces. Comparative Example 2
• a composite fiber was produced under the same conditions as in Example 1 except that the drawing treatment was not performed.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 6.47 dte X s strength 0.60 c./dtex, elongation 4 6 0.3%, 10 0% elongation stress 0.37 c N / dtex, 120 ° C.
• the dry heat shrinkage rate was 0.7%.
• This web composed of 100% heat-adhesive conjugate fiber has a web area shrinkage of 1.4.5%, a nonwoven fabric strength of 14.5 kg / g, and a force niche value of 7.90 cni. It was.
• Example 2
• a composite fiber was produced under the same conditions as in Example 1 except that the draw ratio of cold drawing was 1.1 times.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 6.4 1 dtex, strength 0.65 5 c N, / dtex, elongation 4 2 4.1%, 10 0% elongation capacity 0.4 1 c NZ dtex, 12.0 ° C. Dry heat shrinkage was 1.9%.
• the web composed of 100% heat-adhesive conjugate fiber had a web area shrinkage of 15.6%, a nonwoven fabric strength of 16.5 kg gg, and a cantilever value of 8.10 cm.
• a composite fiber was produced under the same conditions as in Example 1 except that the draw ratio of cold drawing was 1.30.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 6.2 2 dte X, the strength is 0.7 2 c N / dtex, the elongation is 3 8 1.8%, and the elongation is 10%. 6 c NZ dtex, 120 ° C. Dry heat shrinkage was 2.0%.
• the web area shrinkage rate of the heat-adhesive conjugate fiber 100% was 16.1%
• the nonwoven fabric strength was 17.1 kggZ g
• the cantilever value was 8.90 cm. Comparative Example 3
• a composite fiber was produced under the same conditions as in Example 1 except that the draw ratio of cold drawing was 1.4 times.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 6.1 4 dtex, strength 0.75 c N / dtex, elongation 3 4 6.8%, 10 0% elongation stress 0.5 3 c NZ dtex, 1 2 0. (: The dry heat shrinkage rate was 0.6%.
• the product shrinkage was 1.8%
• the nonwoven fabric strength was 18.4 kg / g
• the cantilever was 10.1 cm.
• a composite fiber was produced under the same conditions as in Example 1 except that the cold drawing was performed while cooling in a water bath controlled at a water temperature of 20 ° C.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 6.5 2 dte X, strength 0.65 c N / dtex, elongation 4 59.3%, 10 0% elongation stress 0.39 c N / dtex, 120 ° C. Dry heat shrinkage rate was 1 to 3.2%.
• the web area shrinkage ratio of the heat-adhesive composite fiber 10% was 19.5%
• the nonwoven fabric strength was 15.3 kg
• the cantilever value was 8.13 cm.
• PET Polyethylene terephthalate
• IV 0.64 dL / g
• Tg 70 ° C
• sheath component Thermoadhesive resin component
• MF R 40 g Z 1 0 min
• T m 15 2 ° C
• a composite fiber is formed using a known core-sheath-type composite fiber die so that the core component weight ratio and the sheath component weight ratio are 50 wt%: 50 wt%.
• Spinning was performed at a discharge rate of 0.7 1 g / min nZ hole and a spinning speed of 1 2 500 m / min to obtain an undrawn yarn.
• the undrawn yarn was cold-drawn by 1.2 times, and then cold-drawn into an aqueous solution of an oil agent consisting of 80 wt%: 20 wt% of lauryl phosphate calcium salt and polyoxyethylene-modified silicone.
• an oil agent consisting of 80 wt%: 20 wt% of lauryl phosphate calcium salt and polyoxyethylene-modified silicone.
• a mechanical crimp of 11 pieces / 25 mm was applied using an indentation type gripper with a stuffing box. Further, the crimped yarn was subjected to drying and relaxation heat treatment in hot air at 90 ° C under no tension, and then cut to a fiber length of 51 mm.
• the resulting single-filament fineness of the heat-adhesive conjugate fiber is 5.7 dte X, strength 0.94 c NZ dtex, elongation 3 9 2%, 10 0% elongation stress 0.35 c ⁇ / ' dtex, 120 ° C.
• the dry heat shrinkage was 13.8%.
• the web area shrinkage rate of the web composed of 100% of this heat-adhesive conjugate fiber (however, the heat-bonding temperature was changed to 180 ° C) was 1 1.2%, and the nonwoven fabric strength was 1.2.3.
• k gZ 'g, the cantilever value was 8.3 O cm.
• the low-modulus self-extensible thermoadhesive conjugate fiber of the present invention uses PET as a fiber-forming resin component and has a low spinning speed during production, and therefore has very few yarn breaks during spinning. Further, when a nonwoven fabric is produced using the composite fiber, a bulky nonwoven fabric having high adhesion, high drape, and good texture can be obtained.

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