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
  • D04H3/08—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
  • D04H3/147—Composite 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
• • 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
  • D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
  • D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
• • 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
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/009—Condensation or reaction polymers
  • D04H3/011—Polyesters
• • 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
  • D04H3/05—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 in another pattern, e.g. zig-zag, sinusoidal

Definitions

• the present invention relates to a flexible, touch-friendly spunbonded nonwoven fabric.
• non-woven fabrics for sanitary use such as disposable diapers and sanitary napkins are required to have excellent texture and flexibility because of the feel when worn.
• Long-fiber non-woven fabrics such as spunbond non-woven fabrics are used in various applications due to their properties such as strength, air permeability and bending resistance and high productivity.
• various resins such as polyester resins and polyolefin resins, copolyester resins have come to be considered for use in spunbonded nonwoven fabrics as the raw materials thereof.
• non-woven fabric comprising core-sheath fibers comprising a copolyester resin of a polyalkylene glycol and an aromatic polyester as a sheath component and a polyester resin as a core component has been proposed (see Patent Document 2).
• the copolymerized polyester resin as exemplified in the specification is a resin obtained by copolymerizing 45% by mass of polyethylene glycol with polytetramethylene terephthalate. Since the fiber containing is too high in water absorbability, when it is made into a non-woven fabric, it has a tacky feel and has a problem of being inferior in texture.
• Patent Document 2 since the technology uses a rigid polyester resin for the core, there is a problem that the bending rigidity of the fiber is high and the flexibility is poor when it is a spunbonded nonwoven fabric. .
• the objective of this invention is to provide the spun bond nonwoven fabric which has a softness
• the present inventors obtained the finding that flexibility and touch can be greatly improved in a copolyester resin obtained by copolymerizing polyethylene glycol in a specific amount.
• the spunbonded nonwoven fabric of the present invention is a spunbonded nonwoven fabric composed of a monocomponent fiber consisting of a copolyester resin obtained by copolymerizing 5% by weight or more and 40% by weight or less of polyethylene glycol in a polyester resin,
• the non-woven fabric has a ⁇ MR of 0.5% or more and 15% or less.
• the polyester resin is polyethylene terephthalate.
• ADVANTAGE OF THE INVENTION According to this invention, a softness
• the nonwoven fabric of the present invention is a spunbonded nonwoven fabric composed of a monocomponent fiber consisting of a copolyester resin obtained by copolymerizing 5% by weight or more and 40% by weight or less of polyethylene glycol in a polyester resin, It is a spun bond nonwoven fabric characterized by ⁇ MR being 0.5% or more and 15% or less.
• polyester resin used in the present invention examples include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polylactic acid. Particularly preferred is polyethylene terephthalate.
• polyethylene terephthalate By using polyethylene terephthalate, it has excellent flexibility and touch, and can be drawn at a high spinning speed, so that oriented crystallization can easily proceed and mechanical strength can be obtained.
• the number average molecular weight of the polyethylene glycol contained in the copolyester resin used in the present invention is preferably 4,000 or more and 20,000 or less.
• the number average molecular weight of polyethylene glycol is preferably 4,000 or more and 20,000 or less.
• the number average molecular weight of the polyethylene glycol contained in the copolymerized polyester resin in the present invention refers to a value measured and calculated by the following method.
• (1) Collect about 0.05 g of copolyester resin.
• (2) 1 mL of 28% ammonia water is added to this, and it heats at 120 degreeC for 5 hours, and dissolves a sample.
• (3) After cooling, 1 mL of purified water and 1.5 mL of 6 mol / L hydrochloric acid are added, and the volume is adjusted to 5 mL with purified water.
• the mixture is centrifuged and filtered through a filter with a mesh pore size of 0.45 ⁇ m.
• the filtrate is subjected to molecular weight distribution measurement by GPC.
• the number average molecular weight of polyethylene glycol is calculated using a calibration curve of molecular weight prepared using a standard sample of known molecular weight.
• polyethylene glycol is quantified using a calibration curve of solution concentration prepared with a polyethylene glycol aqueous solution, and the copolymerization amount of polyethylene glycol in the copolymer is calculated.
• the copolymerization amount of the polyethylene glycol contained in the copolyester resin used in the present invention is characterized by being 5% by weight or more and 40% by weight or less.
• the copolymerization amount of polyethylene glycol is characterized by being 5% by weight or more and 40% by weight or less.
• the copolymerization amount of polyethylene glycol refers to a value measured by the method described in the examples.
• a pigment for coloring, an antioxidant, a lubricant such as polyethylene wax, a heat stabilizer, and the like can be added to the copolyester resin used in the present invention as long as the effects of the present invention are not impaired. .
• the melting point of the copolyester-based resin used in the present invention is preferably 200 ° C. or more and 300 ° C. or less, more preferably 220 ° C. or more and 280 ° C. or less.
• the melting point is preferably 200 ° C. or more, more preferably 220 ° C. or more, heat resistance that can withstand practical use is easily obtained.
• the melting point is preferably 300 ° C. or less, more preferably 280 ° C. or less, the yarn discharged from the die becomes easy to cool, and the fusion between the fibers is suppressed, and the obtained spunbonded nonwoven fabric has a disadvantage.
• the melting point of the copolyester-based resin in the present invention refers to a value determined from the peak top temperature of the endothermic peak obtained by measurement under the condition of a temperature rising rate of 16 ° C./min under nitrogen with a differential scanning calorimeter. .
• the method for producing the copolyester of the present invention is produced by a known transesterification method or a polymerization method such as an esterification method.
• a transesterification method an ester-forming derivative of terephthalic acid and ethylene glycol are charged in a reaction vessel and reacted in the range of 150 ° C. to 250 ° C. in the presence of a transesterification catalyst, and then a stabilizer, a polycondensation catalyst, etc. are added. It can be obtained by heating in the range of 250 ° C. or more and 300 ° C. or less under reduced pressure of 500 Pa or less and reacting for 3 hours or more and 5 hours or less.
• esterification method terephthalic acid and ethylene glycol are charged in a reaction vessel and an esterification reaction is carried out at 150 ° C. to 270 ° C. under nitrogen pressure, and after completion of the esterification reaction, a stabilizer, a polycondensation catalyst, etc. are added and 500 Pa or less It can be obtained by heating in the range of 250 ° C. or more and 300 ° C. or less under reduced pressure and reacting for 3 hours or more and 5 hours or less.
• the addition time of polyethylene glycol is not particularly limited, and may be added together with other raw materials before the esterification reaction and the transesterification reaction, and the esterification reaction and the transesterification reaction It may be added before completion of the polycondensation reaction after completion.
• transesterification catalysts examples include zinc acetate, manganese acetate, magnesium acetate, titanium tetrabutoxide, etc.
• polycondensation catalyst antimony trioxide, germanium dioxide, titanium tetrabutoxide etc. Can be mentioned.
• ⁇ MR of the spunbonded nonwoven fabric of the present invention is 0.5% or more and 15% or less.
• ⁇ MR which is a parameter conventionally used as an index of moisture absorption and release of fibers
• the present inventors have found that ⁇ MR, which is a parameter conventionally used as an index of moisture absorption and release of fibers, has a high correlation with the feel of a spunbond nonwoven fabric.
• ⁇ MR 0.5% or more, more preferably 2% or more
• the surface of the spunbond non-woven fabric is in a state of appropriately absorbing moisture, and it is possible to obtain a good touch with a moist feeling when touching the surface.
• ⁇ MR by setting ⁇ MR to 15% or less, more preferably 10% or less, and further preferably 7% or less, a non-sticky feeling can be obtained.
• ⁇ MR is in the above range, it is possible to have slipperiness and flexibility suitable for high-speed production of a spunbonded nonwoven fabric, and a spunbonded nonwoven fabric having excellent high-order processability
• the ⁇ MR can be adjusted by the type of polyester component, the number average molecular weight of the polyethylene glycol contained, and the copolymerization amount.
• ⁇ MR refers to a value measured and calculated by the following method.
• 3 g of a measurement sample is freeze-ground and dried under vacuum at a drying temperature of 110 ° C. for 24 hours to measure its bone-dry mass (W d ).
• the above sample was subjected to 20 ° C. ⁇ 65% R. H.
• the sample is allowed to stand in a constant temperature and humidity controlled atmosphere for 24 hours, and the mass (W 20 ) of the sample in equilibrium is measured.
• the thermostat / humidifier setting is set to 30 ° C. ⁇ 90% R.H. H.
• the mass (W 30 ) after standing for 24 hours is measured, and calculated based on the following equation.
• ⁇ MR (W 30 -W 20 ) / W d (%).
• the copolyester-based fiber constituting the spunbonded nonwoven fabric of the present invention is a monocomponent fiber.
• the fiber When the fiber is a monocomponent fiber, it becomes a spunbonded nonwoven fabric having a soft touch because the flexibility of the copolyester resin is reflected. Furthermore, since the spinnability is improved as compared with the composite fiber, it becomes a spunbonded nonwoven fabric with few defects.
• the average single fiber diameter of the copolyester-based fiber constituting the spunbonded nonwoven fabric of the present invention is preferably 10 ⁇ m or more and 16 ⁇ m or less.
• the average single fiber diameter is preferably 10 ⁇ m or more, more preferably 11 ⁇ m or more.
• the processability at the time of post-processing can be improved, and the number of defects can be reduced.
• the average single fiber diameter is set to 16 ⁇ m or less, more preferably 15 ⁇ m or less, the feel when touching the surface of the spunbond nonwoven fabric obtained from the copolyester-based fiber becomes smooth.
• the flexibility is further improved by expressing a decrease in the second moment of area due to the narrowing of the average single fiber diameter.
• the average single fiber diameter of the copolyester-based fiber is drawn by an ejector and drawn, and then 10 small pieces of sample are randomly taken from the non-woven web collected on the net, and 500 to 500 by a microscope The surface photograph of 1000 times is taken, the width of a total of 100 fibers is measured from 10 samples from each sample, and the value ( ⁇ m) calculated from the arithmetic mean value is indicated.
• the spun bond nonwoven fabric of the present invention has a bending return of 0.2 cm -1 or more and 1.0 cm -1 or less.
• the bending back property is 1.0 cm -1 or less, a feeling of fitting the hand at bending back is obtained, and when it is 0.2 cm -1 or more, a moderate return difficulty is obtained, and a natural feeling is obtained.
• the bendability is more preferably 0.8 cm -1 or less, and further preferably 0.6 cm -1 or less.
• 0.3 cm -1 or more is more preferable, and 0.4 cm -1 or more is more preferable.
• the bendability can be controlled by the thermoplastic resin, the additive, the fiber diameter, and / or the spinning speed, the basis weight, the apparent density, and the method of bonding described above.
• the bendability of the spunbond nonwoven fabric referred to in the present invention refers to bending rigidity (B) and bending hysteresis (2HB) in two orthogonal directions by a bending tester (for example, “KES-FB2”, manufactured by Kato Tech Co., Ltd.) It is a value measured by the following equation.
• ⁇ Bending rigidity (B in direction 1 + B in direction 2) / 2
• Bending hysteresis (2HB in direction 1 + 2HB in direction 2) / 2
• Bendlessness bending hysteresis / bending stiffness
• Spunbonded nonwoven fabric of the present invention preferably has a bending stiffness is less than 10 ⁇ N ⁇ cm 2 / cm or more 300 ⁇ N ⁇ cm 2 / cm.
• bending stiffness is less than 300 ⁇ N ⁇ cm 2 / cm, pliable soft feeling is obtained, by at 10 ⁇ N ⁇ cm 2 / cm or more, in order to moderate the bending response is obtained.
• the flexural rigidity more preferably not more than 250 ⁇ N ⁇ cm 2 / cm, more preferably not more than 200 ⁇ N ⁇ cm 2 / cm. Further, 20 ⁇ N ⁇ cm 2 / cm or more is more preferable, and 30 ⁇ N ⁇ cm 2 / cm or more is more preferable.
• the flexural rigidity can be controlled by the thermoplastic resin, the additive, the fiber diameter, and / or the spinning speed, the basis weight, the apparent density, and the method of bonding described above.
• the spunbonded nonwoven fabric of the present invention preferably has a tensile modulus of 5 MPa or more and 100 MPa or less.
• the tensile elastic modulus is 100 MPa or less, deformation is facilitated, so that the feel following the hand can be obtained, and by being 5 MPa or more, an appropriate sense of resistance can be obtained.
• the tensile elastic modulus is more preferably 80 MPa or less, still more preferably 60 MPa or less. Moreover, 7 MPa or more is more preferable, and 9 MPa or more is still more preferable.
• the tensile modulus of elasticity can be controlled by the thermoplastic resin, the additive, the fiber diameter, and / or the spinning speed, the basis weight, the apparent density, and the method of bonding described above.
• the tensile modulus of elasticity of the spunbonded nonwoven fabric referred to in the present invention is the same as "6.3.1 standard time” in “6.3 Tensile strength and elongation (ISO method)" in JIS L 1913: 2010 "General nonwoven fabric test method”.
• the tensile test with a grip distance of at least 5 cm, which is similarly implemented, is the arithmetic mean of tensile modulus in two directions orthogonal to each other.
• the tensile elastic modulus is obtained by obtaining a curve (stress-strain curve) obtained by the load and the elongation, and determining the largest slope (the increase in load with respect to the elongation is large) in the region of the elongation 20% or less It is the value divided by the area.
• the cross-sectional area of the present invention is the product of the sample width and the thickness (T 0 ) under a load of 0.5 g / cm 2 measured with a compression tester (for example, “KES-FB3”, manufactured by Kato Tech Co., Ltd.) is there.
• the spunbond nonwoven fabric of the present invention has a tensile strength per unit area per unit area of 0.3 (N / 5 cm) / (g / m 2 ) or more and 10 (N / 5 cm) / (g / m 2 ) or less preferable.
• the tensile strength per unit weight is 0.3 (N / 5 cm) / (g / m 2 ) or more, it can withstand the process passability when manufacturing a disposable diaper or the like and the use as a product, By being 10 (N / 5 cm) / (g / m 2 ) or less, flexibility can be obtained.
• the tensile strength per unit area is more preferably 8 (N / 5 cm) / (g / m 2 ) or less, and still more preferably 6 (N / 5 cm) / (g / m 2 ) or less. Moreover, 0.4 (N / 5 cm) / (g / m 2 ) or more is more preferable, and 0.5 (N / 5 cm) / (g / m 2 ) or more is more preferable.
• the tensile strength per unit weight can be controlled by the thermoplastic resin, the additive, the fiber diameter, and / or the spinning speed, the basis weight, the apparent density, and the method of bonding described above.
• the tensile strength of the spunbond nonwoven fabric referred to in the present invention is in accordance with "6.3.1 standard time” of "6.3 Tensile strength and elongation (ISO method)" in JIS L 1913: 2010 "General nonwoven fabric test method". It is the value which divided the average of the tensile strength (strength when a sample broke) of two directions which intersect at right angles with the weight per unit by the tension test which grips at least 5 cm which is carried out.
• the bending resistance of the spunbonded nonwoven fabric of the present invention is preferably 70 mm or less.
• the bending resistance can be adjusted by the resin, the basis weight, the average single fiber diameter and the emboss roll (crimp ratio, temperature and linear pressure).
• the bending resistance in the present invention is calculated according to “6.7.3 41.5 ° cantilever method” in “6.7 Curing resistance” of JIS L 1913: 2010 “General nonwoven fabric testing method”.
• a calculation method first, five test pieces of width 25 mm ⁇ 150 mm are collected, and the short sides of the test pieces are placed on the scale base line on a horizontal table having a 45 ° slope. Next, the test piece is manually slid in the direction of the slope, and when the center point of one end of the test piece contacts the slope, the movement length of the position of the other end is read by the scale. The average value measured and calculated for the back and front of five test pieces is the bending resistance in the present invention.
• the basis weight of the spunbonded nonwoven fabric of the present invention is preferably 5 g / m 2 or more and 50 g / m 2 or less, and more preferably 10 g / m 2 or more and 30 g / m 2 or less.
• the flexibility of the spunbonded nonwoven fabric can be suitably developed.
• the present invention based on “6.2 mass per unit area” in JIS L1913: 2010 “General nonwoven fabric test method” in the present invention, three 20 cm ⁇ 25 cm test pieces are collected per 1 m width of the sample, and the standard is used. weigh each mass (g) in the state, and it refers to a value represented the arithmetic mean value at 1 m 2 per mass (g / m 2).
• the spunbonded nonwoven fabric of the present invention preferably has an apparent density of 0.01 g / cm 3 or more and 0.30 g / cm 3 or less.
• the apparent density is more preferably 0.25 g / cm 3 or less, further preferably 0.20 g / cm 3 or less. Further, 0.03 g / cm 3 or more, more preferably, 0.05 g / cm 3 or more is more preferable.
• the apparent density of the spunbonded nonwoven fabric in the present invention is a value obtained by dividing the above-mentioned basis weight by the thickness.
• the spunbonded nonwoven fabric of the present invention can be widely used for medical hygiene materials, living materials, industrial materials, etc., but it is excellent in flexibility, good in touch feeling, and moreover, good in processability because there are few product defects.
• it can be suitably used for sanitary materials.
• it is a disposable diaper, a catamenial product, a base fabric of a poultice material and the like.
• the spunbond method for producing a spunbonded nonwoven fabric is as follows: the resin is melted, spun from a spinneret and then cooled and solidified into a yarn obtained by pulling and drawing with an ejector, onto a moving net It is a manufacturing method which requires the process of heat-bonding after collecting and forming a non-woven fiber web.
• spinneret and ejector As a shape of the spinneret and ejector used, various things, such as round shape and a rectangle, are employable. Above all, it is a preferred embodiment to use a combination of a rectangular cap and a rectangular ejector from the viewpoint that the amount of compressed air used is relatively small and fusion and rubbing of yarns are unlikely to occur.
• the spinning temperature for melting and spinning the copolyester resin is preferably 240 ° C. or more and 320 ° C. or less, more preferably 250 ° C. or more 310 C. or less, more preferably 260 ° C. or more and 300 ° C. or less.
• the copolyester resin is melted and measured in an extruder, supplied to a spinneret, and spun as long fibers.
• the spun filament yarn is cooled, but as a method of cooling the spun yarn, for example, a method of forcibly blowing cold air onto the yarn, ambient temperature around the yarn And a method of adjusting the distance between the spinneret and the ejector, or a method combining these methods.
• the cooling conditions can be appropriately adjusted and adopted in consideration of the discharge amount per single hole of the spinneret, the temperature for spinning, the ambient temperature, and the like.
• the cooled and solidified yarn is drawn by a compressed air jetted from an ejector and drawn.
• the spinning speed is preferably 2000 m / min or more, more preferably 3000 m / min or more, and still more preferably 4000 m / min or more.
• the obtained long fibers are collected on a moving net to form a non-woven fiber web.
• drawing is performed at a high spinning speed
• the fibers coming out of the ejector are collected by the net in a controlled state by a high speed air flow, and a non-woven fabric with little fiber entanglement and high uniformity is obtained. be able to.
• the nonwoven fiber web thus obtained can be integrated by heat bonding to obtain the intended spunbonded nonwoven fabric.
• a heat embossing roll in which engravings (concave and convex portions) are respectively formed on the upper and lower pair of roll surfaces, and one roll surface is flat (smooth)
• the method of heat bonding by various rolls such as a heat embossing roll consisting of a combination of a heat embossing roll consisting of a combination of a roll in which the surface of the roll is engraved (concave and convex part) and a pair of flat rolls (upper and lower)
• the embossing bonding area ratio at the time of heat bonding is 5% or more and 30% or less.
• the bonding area By setting the bonding area to preferably 5% or more, more preferably 10% or more, strength which can be practically used as a spunbonded nonwoven fabric can be obtained.
• the bonding area By setting the bonding area to preferably 30% or less, more preferably 20% or less, sufficient flexibility can be obtained particularly when used as a spunbonded non-woven fabric for sanitary materials.
• the bonding area mentioned here occupies the entire nonwoven fabric of a portion in which the convex portion of the upper roll and the convex portion of the lower roll overlap and abut on the non-woven fiber web when heat bonding is performed by a roll having a pair of irregularities. Say the percentage. Further, when heat bonding is performed using a roll having an unevenness and a flat roll, the ratio of the convex portion of the roll having an unevenness to the whole nonwoven fabric of the portion in contact with the non-woven fiber web is said.
• the shape of the engraving applied to the heat embossing roll may be circular, oval, square, rectangular, parallelogram, rhombus, regular hexagon, regular octagon, or the like.
• the linear pressure of the heat embossing roll during heat bonding is preferably 5 to 70 N / cm.
• the linear pressure of the roll is preferably 5 N / cm or more, more preferably 10 N / cm or more, further preferably 20 N / cm or more, it is possible to obtain sufficient strength for practical heat bonding as a nonwoven fabric.
• the linear pressure of the roll is preferably 70 N / cm or less, more preferably 60 N / cm or less, more preferably 50 N / cm or less, sufficient flexibility can be obtained particularly when used as a nonwoven fabric for sanitary materials. You can get it.
• ⁇ Device gel permeation chromatograph GPC ⁇ Detector: Differential refractive index detector RI (Tosoh RI-8020, sensitivity 128x) ⁇ Photodiode array detector (SPD-M20A manufactured by Shimadzu Corporation) ⁇ Column: TSKgel G3000PW XL (one) (Tosoh) -Solvent: 0.1 M sodium chloride aqueous solution-Flow rate: 0.8 mL / min ⁇ Column temperature: 40 ° C Injection volume: 0.05 mL Standard sample: polyethylene glycol, polyethylene oxide. (2) ⁇ MR (%): As a constant temperature and humidity chamber, ESPEC "LHU-123" was used for measurement.
• Thickness T 0 (mm) As a compression tester, “KES-FB3” manufactured by Kato Tech Co., Ltd. was used for measurement.
• Tensile modulus (MPa) As a tensile tester, "AGS1 KNX” manufactured by Shimadzu Corporation was used for measurement. The measurement of the thickness T 0 (mm) of the sample, using the same apparatus as in (2).
• Apparent density (g / cm 3 ) It was calculated by dividing the fabric weight by the thickness T 0 (mm).
• Tactile evaluation Ten randomly selected people touched the surface of the non-woven fabric by hand and were evaluated according to the following criteria. The total score of the evaluation results for each non-woven fabric was taken as the tactile evaluation of the non-woven fabric. ⁇ 3: The surface is particularly smooth and the touch is very good. 2: the surface is smooth and the touch is excellent ⁇ 1: the surface is sticky and the touch is poor
• Example 1 The polyethylene glycol contained is melted with an extruder using a copolymerized polyethylene terephthalate having a number average molecular weight of 5500 and a copolymerization amount of 12% by weight from a rectangular die having a spinning temperature of 290 ° C. and a pore diameter ⁇ of 0.30 mm. After cooling and solidifying the yarn spun at a single-hole discharge rate of 0.6 g / min, it is pulled and drawn by compressed air with an ejector pressure of 0.30 MPa with a rectangular ejector, and is moved onto a moving net It collected and obtained the non-woven fiber web which consists of copolyester long filaments.
• the obtained web was made of metal and using an embossing roll with a bonding area ratio of 16% made of metal and water dot pattern engraved on the upper roll, and using a pair of upper and lower heat embossing rolls composed of a metal flat roll on the lower roll.
• Thermal bonding was performed at a temperature of 230 ° C. under a linear pressure of 50 N / cm, and a spunbond nonwoven fabric with a basis weight of 18 g / m 2 was obtained.
• the evaluation results of the obtained spunbonded nonwoven fabric are shown in Table 1.
• Example 2 A spunbond nonwoven fabric was obtained in the same manner as in Example 1 except that the copolymerization amount of the polyethylene glycol contained was 8% by weight. The evaluation results of the obtained spunbonded nonwoven fabric are shown in Table 1.
• Comparative Example 1 A spunbond nonwoven fabric was obtained in the same manner as in Example 1 except that the copolymerization amount of the polyethylene glycol contained was 45% by weight. The evaluation results of the obtained spunbonded nonwoven fabric are shown in Table 1.
• Comparative Example 2 A spunbond nonwoven fabric was obtained in the same manner as in Example 1, except that the amount of polyethylene glycol copolymerized was 2% by weight. The evaluation results of the obtained spunbonded nonwoven fabric are shown in Table 1.
• Examples 1 and 2 were the results having excellent feel and high flexibility.
• Comparative Example 1 when the copolymerization amount of polyethylene glycol is too large, although it has flexibility, the surface of the non-woven fabric is sticky and there is a problem that the feel is remarkably deteriorated.
• Comparative Example 2 when the amount of copolymerization was too small, the bending resistance increased, and the sheet was hard and the result was inferior in texture.

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• Artificial Filaments (AREA)

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• 2019
  • 2019-01-23 KR KR1020207021147A patent/KR102570892B1/ko active IP Right Grant
  • 2019-01-23 SG SG11202006937PA patent/SG11202006937PA/en unknown
  • 2019-01-23 EP EP19743580.3A patent/EP3744888A4/en active Pending
  • 2019-01-23 CN CN201980010085.2A patent/CN111655919A/zh active Pending
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  • 2019-01-25 TW TW108102855A patent/TWI776012B/zh active
• 2023
  • 2023-10-27 JP JP2023184872A patent/JP2023178500A/ja active Pending

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