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
• • 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
  • D04H3/16—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 filaments produced in association with filament formation, e.g. immediately following extrusion
• • 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
  • D04H3/007—Addition polymers
• • 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
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2401/00—Physical properties
  • D10B2401/10—Physical properties porous
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2505/00—Industrial
  • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2505/00—Industrial
  • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
  • D10B2505/204—Geotextiles

Definitions

• the present invention relates to a non-woven fabric having excellent workability.
• a ventilation layer construction method has become widespread in construction of wooden houses, and the like, in which a ventilation layer is provided between an outer wall material and a heat insulating material so that moisture entering the wall body can be released to the outside through the ventilation layer.
• a house wrap material which is a moisture-permeable waterproof sheet having both a waterproof property for preventing rainwater from entering from the outside of a building and moisture permeability for allowing moisture generated in a wall body to be released to the outside, is used.
• a waterproof tape such as a butyl tape having excellent durability and adhesiveness over a long period of time is used particularly for a portion requiring waterproofness
• the waterproof tape is attached to the skeleton of the building, and then a house wrap material is attached onto the waterproof tape.
• house wrap materials are required to have adhesiveness with respect to waterproof tapes.
• Patent Document 1 proposes a non-woven fabric for a house wrap material which is a long-fiber non-woven fabric composed of thermoplastic continuous filaments, in which the filament has a fiber orientation degree of 35 to 70 degrees in the longitudinal direction of the non-woven fabric, the filaments are pressure-bonded to each other on one surface of the non-woven fabric, a large number of partial thermocompression bonding portions which are intermittent in any direction are formed over the entire non-woven fabric, and in the partial thermocompression bonding portion, at least some of the filaments are bonded to each other and aggregated.
• Patent Document 1 Japanese Patent Laid-open Publication No. 2014-040677
• the present invention has been made in view of the above circumstances, and aims to provide a non-woven fabric having an excellent adhesive force with respect to adhesive tapes, for example, waterproof tapes.
• the present inventors have found that, by setting a thickness CV value that is a coefficient of variation of a thickness of a non-woven fabric and porosity seen from the surface, and a porosity seen from the surface CV value that is a coefficient of variation of the porosity seen from the surface to be in specific ranges, a non-woven fabric having a smooth surface and an excellent adhesive force with respect to adhesive tapes can be obtained.
• the present invention has been completed based on the findings, and is configured as follows.
• a non-woven fabric having a smooth surface and an excellent adhesive force with respect to an adhesive tape, for example, a waterproof tape.
• a non-woven fabric of the present invention is a non-woven fabric made from fibers containing a thermoplastic resin as a principal component, and has a thickness CV value of 1.0% or more to 10.0% or less, a porosity seen from the surface of 10% or more to 30% or less, and a porosity seen from the surface CV value of 10% or more and 30% or less.
• a thickness CV value of 1.0% or more to 10.0% or less
• a porosity seen from the surface of 10% or more to 30% or less a porosity seen from the surface CV value of 10% or more and 30% or less.
• thermoplastic resin for the non-woven fabric of the present invention examples include polyesters, polyamides, polyolefins, and mixtures or copolymers thereof.
• polyesters are preferably used because they have excellent mechanical strength, and excellent durability such as heat resistance, water resistance, and chemical resistance.
• a polyester is a high molecular polymer with an acid component and an alcohol component as monomers.
• aromatic carboxylic acids such as terephthalic acid (ortho-form), isophthalic acid, and terephthalic acid
• aliphatic dicarboxylic acids such as adipic acid and sebacic acid
• alicyclic dicarboxylic acids such as cyclohexanecarboxylic acid; and the like
• the alcohol component ethylene glycol, diethylene glycol, and the like can be used.
• polyester examples include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene naphthalate, polylactic acid, and polybutylene succinate.
• PET polyethylene terephthalate
• PBT polybutylene terephthalate
• PTT polytrimethylene terephthalate
• polyethylene naphthalate polylactic acid
• polybutylene succinate examples of the polyester
• PET polyethylene terephthalate
• PET polyethylene terephthalate
• PET polyethylene terephthalate
• is excellent in heat resistance, and is also excellent in rigidity is most preferably used.
• additives such as a nucleating agent, a matting agent, a lubricant, a pigment, an antifungal agent, an antibacterial agent, a flame retardant, a metal oxide, an aliphatic bisamide and/or an alkyl-substituted aliphatic monoamide, and a hydrophilic agent can be added as long as the effect of the present invention is not impaired.
• a metal oxide such as titanium oxide exhibits effects of improving the spinnability by reducing the surface friction of the fibers and preventing bonding between the fibers, and improving the bonding property of the long-fiber non-woven fabric by increasing the thermal conductivity at the time of bonding molding of the long-fiber non-woven fabric with a heat roll.
• aliphatic bisamides such as ethylene-bis-stearic acid amide, and/or alkyl-substituted aliphatic monoamides have effects of enhancing the property of mold-releasing between a heat roll and a non-woven fabric web and improving the conveying performance.
• the non-woven fabric of the present invention is made of a fiber containing the thermoplastic resin as a principal component.
• the "principal component” mentioned herein is a component that accounts for 50 mass% or more among the components of the fiber.
• the fiber according to the present invention is preferably a composite fiber in which a low-melting-point polymer having a melting point lower than that of a high-melting-point polymer is disposed around the high-melting-point polymer.
• the fibers constituting the non-woven fabric are firmly fused to each other, and the number of fusion points between the fibers in the non-woven fabric can also be increased as compared with a case where fibers having different melting points are mixed, so that the mechanical strength can also be improved.
• the difference between the melting point of the high-melting-point polymer and the melting point of the low-melting-point polymer is preferably 10°C or more and 140°C or less.
• it is preferably a low-melting-point polymer having a melting point lower than the melting point of the high-melting-point polymer in the range of 10°C or more and 140°C or less.
• the melting point difference is set to 140°C or less, more preferably 120°C or less, and still more preferably 100°C or less, it is possible to prevent the low-melting-point polymer component from bonding to a heat roll at the time of bonding, and the productivity from decreasing.
• the melting point of the high-melting-point polymer in the present invention is preferably in the range of 160°C or more and 320°C or less.
• the melting point is preferably 160°C or more, more preferably 170°C or more, and still more preferably 180°C or more, for example, when the non-woven fabric is used as a house wrap material, it is possible to obtain a non-woven fabric having excellent form stability such that the form can be maintained even if processing of application of heat is performed.
• the melting point to 320°C or less, more preferably 300°C or less, and still more preferably 280°C or less, it is possible to prevent the productivity from decreasing due to a large amount of heat energy consumed for melting when the non-woven fabric is produced.
• the melting point of the low-melting-point polymer in the composite fiber is preferably in the range of 150°C or more and 310°C or less while the melting point difference is ensured.
• the melting point is set to 150°C or more, more preferably 160°C or more, and still more preferably 170°C or more, when the non-woven fabric is used as a house wrap material, it is possible to obtain a non-woven fabric having excellent form stability such that the form can be maintained even if processing of application of heat is performed.
• the melting point to 310°C or less, more preferably 290°C or less, and still more preferably 270°C or less, a non-woven fabric having an excellent bonding property and an excellent mechanical strength when the non-woven fabric is produced can be easily obtained.
• the melting point of the thermoplastic resin is measured under the conditions of a heating rate of 20°C/min and a measurement temperature range of 30°C to 350°C using a differential scanning calorimeter (for example, "DSC-2" type manufactured by Perkin-Elmer Inc.), and a temperature exhibiting an extreme value in the obtained melting endothermic curve is taken as the melting point of the thermoplastic resin.
• a temperature at which the resin having been heated on a hot plate melts under microscopic observation is taken as the melting point.
• thermoplastic resin is a polyester
• examples of a combination of a pair of a polyester-based high-melting-point polymer and a polyester-based low-melting-point polymer include, for example, combinations of PET/PBT, PET/PTT, PET/polylactic acid, and PET/copolymerized PET, and among these, a combination of PET/copolymerized PET is preferably used since it has excellent spinnability.
• isophthalic acid-copolymerized PET is preferably used since it has particularly excellent spinnability.
• Examples of the composite form of the composite fiber include, for example, a concentric core-sheath type, an eccentric core-sheath type, and a sea-island type, and among these, the concentric core-sheath type is preferable since fibers can be uniformly and firmly bonded.
• examples of the cross-sectional shape of the composite fiber include shapes such as a circular cross section, a flat cross section, a polygonal cross section, a multi-leafed cross section, and a hollow cross section. Among them, it is a preferable aspect to use a fiber having a circular cross-sectional shape as the cross-sectional shape of the composite fiber.
• the content ratio by mass of the high-melting-point polymer to the low-melting-point polymer is preferably in the range of 90:10 to 60:40, more preferably in the range of 85:15 to 70:30.
• the content of the high-melting-point polymer is set to 60 mass% or more and 90 mass% or less, the non-woven fabric can have excellent durability.
• the content of the low-melting-point polymer is 10 mass% or more and 40 mass% or less, fibers constituting the non-woven fabric are firmly bonded to each other, so a non-woven fabric excellent in mechanical strength can be obtained.
• the average single fiber diameter of the fiber according to the present invention is preferably in the range of 10.0 um or more and 26.0 um or less.
• the average single fiber diameter is set to 10.0 um or more, preferably 10.5 um or more, and more preferably 11.0 um or more, a non-woven fabric excellent in mechanical strength can be obtained.
• the average single fiber diameter is set to 26.0 um or less, preferably 25.0 um or less, and more preferably 24.0 um or less, the uniformity of the non-woven fabric is improved, a non-woven fabric having a dense surface can be obtained, and for example, when the non-woven fabric is used as a house wrap material, a non-woven fabric having less surface unevenness can be obtained.
• a value obtained by using the following method is employed for an average single fiber diameter ( ⁇ m) of the non-woven fabric.
• the non-woven fabric of the present invention is made of a fiber containing the thermoplastic resin as a principal component.
• the non-woven fabric is preferably a long-fiber non-woven fabric which is generally excellent in productivity and incurs low cost.
• the non-woven fabric is more preferably a spunbond non-woven fabric which is more excellent in productivity and incurs low cost, and further can gain higher mechanical strength by bonding the temporary set web with a pair of thermocompression rolls.
• the non-woven fabric of the present invention has a thickness CV value of 1.0% or more and 10.0% or less.
• the thickness CV value is 1.0% or more, preferably 3.0% or more, and more preferably 5.0% or more, the adhesive force with respect to adhesive tapes can be further enhanced.
• the thickness CV value is 10.0% or less, preferably 8.0% or less, and more preferably 7.0% or less, a non-woven fabric having sufficient mechanical strength is obtained.
• the thickness CV value (%) of the non-woven fabric refers to a value measured and calculated in the following method.
• the thickness CV value (%) of the non-woven fabric can be adjusted by making the form of the fibers constituting the non-woven fabric (such as a composite fiber) as described above, or by setting the conditions of the temperature and pressure of the rolls used when the fiber webs are bonded, the tension applied to the fiber webs at that time, and the like to be in the ranges described below.
• the non-woven fabric has a porosity seen from the surface of 10% or more and 30% or less.
• the porosity seen from the surface is 10% or more, preferably 13% or more, and more preferably 15% or more, the adhesive force with respect to adhesive tapes can be further enhanced.
• the porosity seen from the surface is 30% or less, preferably 27% or less, and more preferably 25% or less, a non-woven fabric having sufficient mechanical strength is obtained.
• the porosity seen from the surface (%) of the non-woven fabric can be adjusted by making the form of the fibers constituting the non-woven fabric (such as a composite fiber) as described above, or by setting the conditions of the temperature and pressure of the rolls used when the fiber webs are bonded, the tension applied to the fiber webs at that time, and the like to be in the ranges described below.
• the non-woven fabric has a porosity seen from the surface CV value of 10% or more and 30% or less.
• porosity seen from the surface CV value is set to 10% or more, preferably 13% or more, more preferably 15% or more, a non-woven fabric in which voids are appropriately arranged is obtained, and the adhesive force with respect to adhesive tapes can be further enhanced.
• the porosity seen from the surface CV value is set to 30% or less, preferably 25% or less, and more preferably 20% or less, a non-woven fabric that is more homogeneous and has high mechanical strength is obtained.
• the basis weight of the non-woven fabric of the present invention is preferably 20 g/m 2 or more and 60 g/m 2 or less.
• the basis weight of the non-woven fabric is 20 g/m 2 or more, preferably 25 g/m 2 or more, more preferably 25 g/m 2 or more, a non-woven fabric that is excellent in mechanical strength can be obtained.
• the basis weight of the non-woven fabric is 60 g/m 2 or less, preferably 55 g/m 2 or less, and more preferably 50 g/m 2 or less, a non-woven fabric that is lightweight and excellent in workability can be obtained.
• the basis weight of the non-woven fabric a value measured according to the following procedure based on "6.2 Mass Per Unit Area” in the "General Test Method for Non-woven Fabric” of JIS L1913:2010 is employed.
• the apparent density of the non-woven fabric of the present invention is preferably 0.40 g/cm 3 or more and 0.70 g/cm 3 or less.
• the apparent density of the non-woven fabric is set to 0.40 g/cm 3 or more, or more preferably 0.43 g/cm 3 or more, the surface of the non-woven fabric becomes smoother, and the mechanical strength can be further enhanced.
• the apparent density of the non-woven fabric is set to 0.70 g/cm 3 or less, or more preferably 0.67 g/cm 3 or less, the anchor effect is easily exhibited between adhesive tapes and the non-woven fabric, and a non-woven fabric having an excellent adhesive force with respect to the adhesive tapes can be obtained.
• the apparent density of the non-woven fabric is assumed to be calculated by using the following method by adopting a thickness value measured according to the following procedure based on "5.1” "Testing Method for Woven and Knitted Fabrics” of JIS L1906:2000.
• the non-woven fabric of the present invention is particularly suitable for building material applications. That is, the building material of the present invention contains the non-woven fabric of the present invention.
• the non-woven fabric of the present invention is preferably produced by sequentially performing the following steps (a) to (c).
• thermoplastic resin (a) The step of spinning a thermoplastic resin
• thermoplastic resin is melted and extruded from a spinneret.
• a composite fiber in which a low-melting-point polymer having a melting point lower than the melting point of a high-melting-point polymer is disposed around the high-melting-point polymer is used as a fiber containing a thermoplastic resin as a principal component
• a polyester-based high-melting-point polymer and a polyester-based low-melting-point polymer be melted at a melting point or more and (melting point +70°C) or less, respectively, and the fibers are spun out from pores with a spinneret having a spinneret temperature at a melting point or more and (melting point +70°C) or less as a composite fiber in which a low-melting-point polymer having a melting point lower by 10°C or more and 140°C or less than the melting point of the high-melting-point polymer is disposed around the high-melting-
• thermoplastic resin melted and extruded from the spinneret and spun is preferably spun into fibers having a circular cross-sectional shape.
• fiber webs are formed from the fibers spun in step (a).
• the spun fibers are sucked by an ejector, sprayed from a slit-like opening plate to a lower portion of the ejector, and further deposited on a moving net conveyor to form fiber webs.
• step (c) it is preferable to preheat the fiber webs collected on the net conveyor and to perform step (c) consecutively to step (b).
• a method in which the collected fiber webs are preheated by hot air from above the net conveyor, or a flat roll is placed on the net conveyor to preheat the space between the net conveyor and the flat roll is preferably used.
• the preheating is preferably performed to set the temperature of the non-woven webs to 100°C or more and 160°C or less.
• the preheating is preferably performed to set the temperature of the non-woven webs to 100°C or more, preferably 110°C or more, and more preferably 120°C or more.
• the transportability of the non-woven webs can be improved.
• the temperature of the non-woven webs to 160°C or less, preferably 150°C or less, and more preferably 140°C or less, appropriate crystallization of the non-woven webs can be promoted.
• the non-woven webs obtained in step (b) are bonded. Most of all, it is preferable to bond the non-woven webs such that the ratio A of the average single fiber diameter calculated by suing the following formula (1) is 0.85 or more and 0.95 or less.
• A (Average single fiber diameter of non-woven webs before bonding ( ⁇ m))/(Average single fiber diameter of non-woven fabric after bonding ( ⁇ m))
• step (b) it is preferable to bond the non-woven webs obtained in step (b) such that the temperature of the non-woven webs is in the above range and the ratio A is 0.85 or more and 0.95 or less.
• the ratio A is preferably 0.85 or more and preferably 0.88 or more
• a non-woven fabric having an excellent adhesive force with respect to adhesive tapes can be obtained.
• the non-woven webs such that the ratio A is preferably 0.95 or less or 0.92 or less a non-woven fabric having excellent mechanical strength can be obtained.
• a value obtained by the following method is employed as the average single fiber diameter ( ⁇ m) of the non-woven webs before bonding of the formula (1), and a value obtained by the same method as the method for measuring and calculating the average single fiber diameter of the non-woven fabric is employed as the average single fiber diameter ( ⁇ m) of the non-woven fabric after bonding.
• the above-described ratio A can be adjusted by changing the discharge amount of the thermoplastic resin in step (a) or the pressure in step (b).
• the temperature for bonding by a heat roll is preferably lower than the melting point of the thermoplastic resin having the lowest melting point present on the surface of the fibers constituting the fiber webs by 5°C or more and 60°C or less.
• the temperature for bonding is preferably lower than the melting point of the thermoplastic resin having the lowest melting point present on the surface of the fibers constituting the fiber webs by 5°C or more and 60°C or less.
• the linear pressure of the heat roll for bonding is preferably 290 N/cm or more and 890 N/cm or less.
• the linear pressure of the heat roll for bonding is preferably 290 N/cm or more, or more preferably 390 N/cm or more.
• the non-woven fabric of the present invention will be specifically described based on examples. However, the present invention is not limited only to these examples. Unless otherwise described, each physical property is measured based on the methods described above.
• the intrinsic viscosity (IV) of the thermoplastic resin was measured by using the following method.
• the average single fiber diameter of the non-woven webs before bonding was calculated by using the above method using "VHX-D500" manufactured by KEYENCE CORPORATION as a scanning electron microscope.
• the average single fiber diameter of the non-woven fabric after bonding of the fabric according to the present invention was calculated by using the above-described method using "VHX-D500" manufactured by KEYENCE CORPORATION as a scanning electron microscope.
• the basis weight of the non-woven fabric was calculated by the above method.
• the thickness of the non-woven fabric was evaluated by using the above-described method using "Teclock” (registered trademark) SM-114 manufactured TECLOCK Co., Ltd. as a thickness gauge.
• the apparent density of the non-woven fabric was calculated by using the above method.
• the thickness CV value of the non-woven fabric was calculated by using the above-described method using "VHX-D500" manufactured by KEYENCE CORPORATION as a scanning electron microscope.
• the porosity seen from the surface and the porosity seen from the surface CV value of the non-woven fabric were calculated by using the above-described method using "VHX-D500" manufactured by KEYENCE CORPORATION as a scanning electron microscope.
• the polyester-based resin A and the polyester-based resin B were melted at temperatures of 295°C and 280°C, respectively. Then, the polyester-based resin A as a core component and the polyester-based resin B as a sheath component were spun from the pore at a spinneret temperature of 295°C and a core: sheath mass ratio of 80:20, and then a filament having a circular cross-sectional shape was spun.
• the obtained fibers were sucked by an ejector, and the fiber arrangement was regulated and deposited on a net conveyor whose movement speed was adjusted so that the basis weight of the obtained non-woven fabric was 25 g/m 2 by an opening plate to collect a fiber web.
• the average single fiber diameter of the fiber webs before bonding was 11.3 um. Then, the collected fiber webs were preheated at 160°C.
• the preheated non-woven webs were bonded by a calender roll composed of a pair of flat rolls under the condition that the surface temperature of each of the upper and lower flat rolls was 185°C and the linear pressure was 686 N/cm.
• the average single fiber diameter of the non-woven fabric after bonding was 12.1 um, and the ratio A of the average single fiber diameter was 0.93.
• the obtained non-woven fabric had a thickness CV value of 6.5%, a porosity seen from the surface of 25%, and a porosity seen from the surface CV value of 25%, a basis weight of 25 g/m 2 , an apparent density of 0.42 g/cm 3 , and an adhesive force with respect to an adhesive tape of 15.1 N/25 mm. The results are shown in Table 1.
• a non-woven fabric was obtained under the same conditions as in example 1 except that, in the (step of forming fiber webs), the moving speed of the net conveyor to adjust the basis weight of the non-woven fabric obtained to 25 g/m 2 was changed to adjust the moving speed of the net conveyor to 40 g/m 2 , and preheating at 160°C for the fiber webs was changed to preheating at 150°C.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 12.4 um
• the ratio A of the average single fiber diameter was 0.91.
• the obtained non-woven fabric had a thickness CV value of 6.8%, a porosity seen from the surface of 21%, and a porosity seen from the surface CV value of 21%, a basis weight of 40 g/m 2 , an apparent density of 0.57 g/cm 3 , and an adhesive force with respect to an adhesive tape of 16.4 N/25 mm.
• Table 1 The results are shown in Table 1.
• a non-woven fabric was obtained under the same conditions as in example 1 except that, in the (step of forming fiber webs), the moving speed of the net conveyor to adjust the basis weight of the non-woven fabric obtained to 25 g/m 2 was changed to adjust the moving speed of the net conveyor to 60 g/m 2 , and preheating at 160°C for the fiber webs was changed to preheating at 130°C.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 12.5 um
• the ratio A of the average single fiber diameter was 0.90.
• the obtained non-woven fabric had a thickness CV value of 7.3%, a porosity seen from the surface of 15%, and a porosity seen from the surface CV value of 15%, a basis weight of 60 g/m 2 , an apparent density of 0.60 g/cm 3 , and an adhesive force with respect to an adhesive tape of 18.9 N/25 mm.
• Table 1 The results are shown in Table 1.
• a non-woven fabric was obtained under the same conditions as in example 3 except that, in the (step of forming fiber webs), preheating at 130°C for the fiber webs was changed to preheating at 100°C
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 13.1 um
• the ratio A of the average single fiber diameter was 0.86.
• the obtained non-woven fabric had a thickness CV value of 6.5%, a porosity seen from the surface of 10%, and a porosity seen from the surface CV value of 29%, a basis weight of 60 g/m 2 , an apparent density of 0.67 g/cm 3 , and an adhesive force with respect to an adhesive tape of 15.7 N/25 mm.
• Table 1 The results are shown in Table 1.
• a non-woven fabric was obtained under the same conditions as in example 1 except that, in the (step of forming fiber webs), preheating at 160°C for the collected fiber webs was changed to preheating at 90°C
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 13.3 um
• the ratio of the average single fiber diameter was 0.85.
• the obtained non-woven fabric had a thickness CV value of 4.7%, a porosity seen from the surface of 12%, and a porosity seen from the surface CV value of 34%, a basis weight of 25 g/m 2 , an apparent density of 0.63 g/cm 3 , and an adhesive force with respect to an adhesive tape of 10.1 N/25 mm.
• Table 2 The results are shown in Table 2.
• a non-woven fabric was obtained under the same conditions as in example 1 except that, in the (step of forming fiber webs), preheating at 160°C for the collected fiber webs was changed to preheating at 170°C.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 11.8 um
• the ratio of the average single fiber diameter was 0.96.
• the obtained non-woven fabric had a thickness CV value of 10.3%, a porosity seen from the surface of 33%, and a porosity seen from the surface CV value of 27%, a basis weight of 25 g/m 2 , an apparent density of 0.36 g/cm 3 , and an adhesive force with respect to an adhesive tape of 12.4 N/25 mm.
• the results are shown in Table 2.
• a non-woven fabric was obtained under the same conditions as in example 2 except that, in the (step of forming fiber webs), preheating at 150°C for the collected fiber webs was changed to preheating at 90°C.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 13.4 um
• the ratio of the average single fiber diameter was 0.84.
• the obtained non-woven fabric had a thickness CV value of 5.1%, a porosity seen from the surface of 11%, and a porosity seen from the surface CV value of 35%, a basis weight of 40 g/m 2 , an apparent density of 0.80 g/cm 3 , and an adhesive force with respect to an adhesive tape of 8.9 N/25 mm.
• the results are shown in Table 2.
• a non-woven fabric was obtained under the same conditions as in example 2 except that, in the (step of forming fiber webs), preheating at 150°C for the collected fiber webs was changed to preheating at 180°C.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 11.7 um
• the ratio of the average single fiber diameter was 0.96.
• the obtained non-woven fabric had a thickness CV value of 14.3%, a porosity seen from the surface of 31%, and a porosity seen from the surface CV value of 28%, a basis weight of 40 g/m 2 , an apparent density of 0.50 g/cm 3 , and an adhesive force with respect to an adhesive tape of 10.4 N/25 mm.
• Table 2 The results are shown in Table 2.
• a non-woven fabric was obtained under the same conditions as in example 3 except that, in the (step of forming fiber webs), preheating at 130°C for the collected fiber webs was changed to preheating at 90°C.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 13.4 um
• the ratio of the average single fiber diameter was 0.84.
• the obtained non-woven fabric had a thickness CV value of 5.3%, a porosity seen from the surface of 7%, and a porosity seen from the surface CV value of 36%, a basis weight of 60 g/m 2 , an apparent density of 0.75 g/cm 3 , and an adhesive force with respect to an adhesive tape of 5.9 N/25 mm.
• the results are shown in Table 2.
• the obtained non-woven fabric had a thickness CV value of 18.5%, a porosity seen from the surface of 27%, and a porosity seen from the surface CV value of 31%, a basis weight of 60 g/m 2 , an apparent density of 0.46 g/cm 3 , and an adhesive force with respect to an adhesive tape of 8.2 N/25 mm.
• Table 2 The results are shown in Table 2.
• a non-woven fabric was obtained under the same conditions as in example 1 except that, in the (step of forming fiber webs), the thickness of the obtained non-woven fabric set to 0.06 mm was adjusted to a thickness of 0.08 mm at the time of bonding.
• the average single fiber diameter of the fiber webs before bonding was 11.3 ⁇ m
• the average single fiber diameter of the non-woven fabric after bonding was 11.6 um
• the ratio of the average single fiber diameter was 0.97.
• the obtained non-woven fabric had a thickness CV value of 12.1%, a porosity seen from the surface of 34%, and a porosity seen from the surface CV value of 37%, a basis weight of 25 g/m 2 , an apparent density of 0.31 g/cm 3 , and an adhesive force with respect to an adhesive tape of 10.8 N/25 mm.
• Table 2 The results are shown in Table 2.
• the characteristics of the obtained non-woven fabric were as shown in Tables 1 and 2, and the spunbond non-woven fabrics of examples 1 to 4 were excellent in adhesive strength with respect to adhesive tapes, and exhibited good characteristics as non-woven fabrics.
• the bonding was excessive and a filmed portion was not excellent in adhesive strength with respect to adhesive tapes, or crystallization of fibers was promoted by preheating, bonding of the non-woven fabrics was weak, the adhesive areas with respect to the adhesive tapes were poor, and the adhesive strength with the adhesive tapes was not excellent.
• the bonding of the non-woven fabric was weak, the adhesive area with respect to the adhesive tape was poor, and the adhesive strength with respect to the adhesive tape was not excellent.

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• 2023
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