WO2023085276A1 - 長繊維不織布、及びそれを用いた袋状物 - Google Patents
長繊維不織布、及びそれを用いた袋状物 Download PDFInfo
- Publication number
- WO2023085276A1 WO2023085276A1 PCT/JP2022/041584 JP2022041584W WO2023085276A1 WO 2023085276 A1 WO2023085276 A1 WO 2023085276A1 JP 2022041584 W JP2022041584 W JP 2022041584W WO 2023085276 A1 WO2023085276 A1 WO 2023085276A1
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- WIPO (PCT)
- Prior art keywords
- nonwoven fabric
- long
- fiber nonwoven
- bag
- fiber
- Prior art date
Links
- 239000004745 nonwoven fabric Substances 0.000 title claims abstract description 89
- 239000000835 fiber Substances 0.000 claims abstract description 111
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 19
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 19
- -1 polyethylene terephthalate Polymers 0.000 claims abstract description 16
- 230000005484 gravity Effects 0.000 claims abstract description 12
- 239000000470 constituent Substances 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 239000011347 resin Substances 0.000 claims abstract description 9
- 239000004744 fabric Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 19
- 238000009987 spinning Methods 0.000 description 19
- 238000004080 punching Methods 0.000 description 12
- 238000004049 embossing Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 229920000728 polyester Polymers 0.000 description 10
- 238000005304 joining Methods 0.000 description 7
- 238000007906 compression Methods 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000011179 visual inspection Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 2
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920002215 polytrimethylene terephthalate Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 description 1
- 235000003403 Limnocharis flava Nutrition 0.000 description 1
- 244000278243 Limnocharis flava Species 0.000 description 1
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D29/00—Sacks or like containers made of fabrics; Flexible containers of open-work, e.g. net-like construction
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
- D01F6/62—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from 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
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/04—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres
- D04H1/08—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres having existing or potential cohesive properties, e.g. natural fibres, prestretched or fibrillated artificial fibres and hardened by felting; Felts or felted products
- D04H1/16—Laminated felts in which the separate layers are united by a felting process
-
- 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
- D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
- D04H3/10—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 yarns or filaments made mechanically
- D04H3/105—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 yarns or filaments made mechanically by needling
Definitions
- the present invention relates to a long-fiber nonwoven fabric and a bag-like article with excellent shrinkability.
- Patent Literature 1 discloses a technique that can contribute to energy saving by blending an amorphous polyester so that it can shrink at a low temperature, so that less heat energy is exerted on the shrinking process.
- Patent Document 2 discloses a highly shrinkable nonwoven fabric containing short fibers of isophthalic acid-copolymerized polyethylene terephthalate.
- Patent Document 1 is not a single polyethylene terephthalate, but a blend, so it is difficult to recycle.
- Patent Document 2 is a short-fiber nonwoven fabric, it is inferior in strength to a long-fiber nonwoven fabric.
- the present invention has been made in view of the above-mentioned problems of the prior art, and its object is to provide a long-fiber nonwoven fabric with good recyclability and high shrinkability, and to provide a thermo-compression-bondable bag using the same. , is.
- the present invention is as follows.
- a long fiber nonwoven fabric made of a resin containing 99% or more polyethylene terephthalate, having a dry heat area shrinkage of 30% or more at 100°C for 3 minutes, and a birefringence ( ⁇ n) of the constituent fibers of 10 ⁇ 10 -3 to 60. ⁇ 10 ⁇ 3 , and the specific gravity of the constituent fibers is 1.335 to 1.340 g/cm 3 .
- the filament nonwoven fabric according to item 1 wherein the ratio of dry heat area shrinkage in the machine direction and the cross direction is 0.95 to 1.05. 3.
- the long-fiber nonwoven fabric of the present invention is made of a resin having a polyethylene terephthalate component of 99% or more, it has good recyclability and can be used to obtain a bag-like article that can be thermocompression bonded.
- the long-fiber nonwoven fabric of the present invention will be described.
- polyester is preferable, and polyethylene terephthalate (PET), which is a general-purpose thermoplastic resin and is inexpensive, is particularly preferable.
- Other resins that can be used include polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), polyethylene naphthalate (PEN), polycyclohexanedimethylterephthalate (PCHT), polytrimethylene terephthalate (PTT), and other homogenous resins.
- Polyester can be exemplified. In the present invention, PET is used.
- PET is excellent in properties such as strength and heat resistance.
- a polyester other than PET may be blended as long as the content is less than 1% by mass.
- the intrinsic viscosity of PET is not particularly limited, it is preferably 0.63 dl/g or more.
- the long-fiber nonwoven fabric of the present invention may also contain commonly used additives such as paints, pigments, matting agents, antistatic agents, flame retardants, and reinforcing particles.
- the method for producing the long-fiber nonwoven fabric is not particularly limited, but it is preferably produced by a spunbond method from the viewpoint that the long-fiber nonwoven fabric can be easily obtained in terms of productivity and mechanical strength properties.
- a method is used in which the resin to be used is fiberized at a spinning speed lower than the conditions under which stable filaments can be obtained by oriented crystallization to form a sheet.
- the spinning speed must be appropriately changed depending on the resin used, and the spinning speed when using PET is preferably 2000 to 3500 m/min, more preferably 2000 to 3000 m/min.
- the average fiber diameter of the long fibers (single fibers) constituting the long fiber nonwoven fabric is preferably about 1 to 20 dtex, more preferably about 2 to 15 dtex.
- the basis weight of the long-fiber nonwoven fabric can be set in consideration of the mechanical strength properties required for the final product, but is preferably 100 g/m 2 or more in order to obtain the stress that causes shrinkage by heat treatment. Considering the ability to pass the mechanical entanglement step after obtaining the long-fiber nonwoven fabric, it is preferable to limit the pressure bonding of the long-fiber nonwoven fabric to the extent that transportability is obtained. If the average fiber diameter and basis weight are within the above ranges, each property such as strength, workability, and flexibility can be made excellent in a well-balanced manner.
- the birefringence ( ⁇ n) of the constituent fibers of the long-fiber nonwoven fabric of the present invention is preferably 60 ⁇ 10 ⁇ 3 or less. It is more preferably 55 ⁇ 10 ⁇ 3 or less, still more preferably 50 ⁇ 10 ⁇ 3 or less.
- the birefringence of the fiber exceeds 60 ⁇ 10 ⁇ 3 , the polymer molecules are oriented and crystallized, inhibiting shrinkage and resulting in a low shrinkage rate.
- the birefringence can be controlled by the ejection conditions, cooling conditions, and drawing conditions during fiberization.
- the spinning speed is preferably 2000 to 3500 m/min, more preferably 2500 to 3000 m/min.
- the specific gravity of the constituent fibers of the long-fiber nonwoven fabric is preferably 1.330-1.340 g/cm 3 , more preferably 1.335-1.340 g/cm 3 . Within the above range, properties such as strength, workability and flexibility can be well balanced and excellent.
- Methods for mechanically entangling the fibers of the long-fiber nonwoven fabric include methods such as needle punching and water punching, but needle punching is preferred because it does not require drying and enables a high basis weight. Penetrate and entangle the needle with a needle punch. Since the filament nonwoven fabric of the present invention is composed of fibers having a high area shrinkage ratio, the filament strength is low and the fibers are easily cut by needle punching. For this reason, problems such as reduction in strength after needle punching are likely to occur. The number of penetrations and needle depth need to be appropriately set according to the type of needle to be used, the desired mechanical strength characteristics and basis weight, and are not limited.
- the long-fiber nonwoven fabric of the present invention can be easily formed into a bag-like article by bonding by thermocompression.
- a bag-like article using the long-fiber nonwoven fabric of the present invention is also within the scope of the present invention.
- the bag-like article of the present invention has joints in which long-fiber nonwoven fabrics are joined together by thermocompression.
- the joining strength of the joining portion is one-third or less of the strength of the long-fiber nonwoven fabric. Within this range, it is possible to easily open the bag from the joint.
- the bag-like object can be brought into close contact with the contents to be put into the bag-like object by heat shrinkage.
- ⁇ Area shrinkage> According to 6.10 of JIS L 1913 (2010), a long fiber nonwoven fabric is cut into 250 mm squares at arbitrary 10 points, and 200 mm length marks are attached at 3 points each in the vertical and horizontal directions. Heat treatment is performed at 100° C. for 3 minutes in a constant temperature dryer, and the area shrinkage rate is determined from the dimensional change before and after the heat treatment.
- This heat-sealed sample is spread out, according to JIS L 1913 (2010) 6.3 Tensile strength and elongation rate (ISO method), a constant speed elongation type tensile tester (Tensilon manufactured by Orientec) and the same tester , the product width of the sample is 50 mm long, 200 mm long, 3 test pieces are pulled at a grip interval of 100 mm, measured at a speed of 200 mm / min, and the average value of the resulting tensile strengths is the bonding strength (N / 5 cm ).
- the entangled long-fiber nonwoven fabric is measured in a size of 20 cm ⁇ 20 cm according to the method described in JIS L 1913 (2010), and the mass per unit area is measured.
- Example 1 A polyester having an intrinsic viscosity of 0.63 dl/g and a polyethylene terephthalate content of 99% or more was used as a raw material for the nonwoven fabric. Spinning is performed at a spinning temperature of 285°C at a single hole discharge rate of 1.74 g/min from a spinneret with an orifice diameter of ⁇ 0.30 mm. Dry air is supplied at a pressure of 0.85 kg/cm 2 to an ejector positioned 900 mm directly below the mouthpiece, and stretched in one step to 1.0 downward. While opening the fiber bundle onto the conveyor net at the position m, the speed was adjusted so that the fiber arrangement was random, and the fiber bundle was deposited.
- the single filament fineness is 6.0 dtex
- the converted spinning speed is 2800 m/min
- the ⁇ n is 41 ⁇ 10 ⁇ 3
- the specific gravity is 1.338 g/cm 3
- the dry heat area shrinkage ratio in the longitudinal direction and the transverse direction is 1.0. 01, a long fiber nonwoven fabric having a basis weight of 200 g/m 2 was obtained.
- embossing is performed at 60° C. and a linear pressure of 30 kN/m by an embossing roll having truncated pyramid-shaped protrusions arranged in a staggered manner with a compression area ratio of 8% installed on the inline, and a thermocompression type long-fiber nonwoven fabric.
- One side of the thermocompression-bonded filament nonwoven fabric was entangled by needle punching at a needle density of 95/cm 2 and a needle depth of 10 mm to obtain an entangled filament nonwoven fabric.
- the entangled long-fiber nonwoven fabric was cut into a length of 25 cm and a width of 10 cm, preheated at 190°C for 10 seconds, then folded in half, and a bonding temperature of 190°C and a bonding pressure of 1 cm from the end of the long-fiber nonwoven fabric.
- Thermocompression bonding was performed at 15 kg/cm 2 for a bonding time of 5 seconds to obtain a bag-shaped article having a bonded portion.
- the entire surface of the thermocompression-bonded portion was bonded to form a bonded portion.
- the content was placed in this bag-shaped material and heat-treated at 100° C. for 3 minutes to obtain a heat-shrinkable bag-shaped material. It was confirmed by visual inspection that the bag-like article and the content were in close contact due to heat shrinkage. Furthermore, both longitudinal ends of the joint portion of the bag were cut and the joint strength was evaluated by the method described above.
- Example 2 A polyester having an intrinsic viscosity of 0.63 dl/g and a polyethylene terephthalate content of 99% or more was used as a raw material for the long fiber nonwoven fabric.
- Spinning is performed at a spinning temperature of 285°C at a single hole discharge rate of 1.74 g/min from a spinneret with an orifice diameter of ⁇ 0.30 mm.
- Dry air is supplied at a pressure of 0.85 kg/cm 2 to an ejector placed 900 mm directly below the spinneret to draw the fiber bundle in one step, and spread the fiber bundle onto a conveyor net 1.0 m below the fiber.
- the deposition rate was adjusted so that the arrangement was random.
- the single filament fineness is 6.0 dtex
- the converted spinning speed is 2800 m/min
- the ⁇ n is 41 ⁇ 10 ⁇ 3
- the specific gravity is 1.338 g/cm 3
- the dry heat area shrinkage ratio in the longitudinal direction and the transverse direction is 1.0. 01, a long fiber nonwoven fabric having a basis weight of 200 g/m 2 was obtained.
- embossing is performed at 60° C. and a linear pressure of 30 kN/m by an embossing roll having truncated pyramid-shaped protrusions arranged in a staggered manner with a compression area ratio of 8% installed on the inline, and a thermocompression type long-fiber nonwoven fabric.
- One side of the thermocompression-bonded filament nonwoven fabric is entangled by needle punching at a needle density of 49/cm 2 and a needle depth of 8 mm, and then the density is 51/cm 2 from the needle punched surface.
- the entangling treatment was performed by needle punching at a needle needle depth of 8 mm to obtain an entangling long-fiber nonwoven fabric.
- the entangled long-fiber nonwoven fabric was cut into a length of 25 cm and a width of 10 cm, preheated at 190°C for 10 seconds, folded in half, and 1 cm from the end of the long-fiber nonwoven fabric was joined at a temperature of 190°C and a joining pressure of 12 kg/kg. cm 2 and bonding time of 5 seconds, thermocompression bonding was performed to obtain a bag-like object having a bonded portion. The entire surface of the thermocompression-bonded portion was bonded to form a bonded portion. The content was placed in this bag-shaped material and heat-treated at 100° C. for 3 minutes to obtain a heat-shrinkable bag-shaped material. It was confirmed by visual inspection that the bag-like article and the content were in close contact due to heat shrinkage. Furthermore, both longitudinal ends of the joint portion of the bag were cut and the joint strength was evaluated by the method described above.
- Example 3 Polyester having an intrinsic viscosity of 0.63 dl/g and a polyethylene terephthalate content of 99% or more was used as a raw material for the long-fiber nonwoven fabric.
- Spinning is performed at a spinning temperature of 285°C at a single hole discharge rate of 1.74 g/min from a spinneret with an orifice diameter of ⁇ 0.30 mm.
- Dry air is supplied at a pressure of 0.85 kg/cm 2 to an ejector placed 900 mm directly below the spinneret to draw the fiber bundle in one step, and spread the fiber bundle onto a conveyor net 1.0 m below the fiber.
- the deposition rate was adjusted so that the arrangement was random.
- the single filament fineness is 6.7 dtex
- the converted spinning speed is 2500 m/min
- the ⁇ n is 48 ⁇ 10 ⁇ 3
- the specific gravity is 1.335 g/cm 3
- the dry heat area shrinkage ratio in the longitudinal direction and the transverse direction is 1.0. 02, a long fiber nonwoven fabric having a basis weight of 150 g/m 2 was obtained.
- embossing is performed at 60° C. and a linear pressure of 30 kN/m by an embossing roll having truncated pyramid-shaped protrusions arranged in a staggered manner with a compression area ratio of 8% installed on the inline, and a thermocompression type long-fiber nonwoven fabric.
- One side of the thermocompression bonding type long-fiber nonwoven fabric is entangled by needle punching at a needle density of 49/cm 2 and a needle depth of 8 mm .
- An entangling treatment was performed by needle punching at 8 mm to obtain an entangled long-fiber nonwoven fabric.
- the entangled long-fiber nonwoven fabric was cut into a length of 25 cm and a width of 10 cm, preheated at 190°C for 10 seconds, folded in half, and 1 cm from the edge of the long-fiber nonwoven fabric was joined at a temperature of 170°C under a joining pressure of 10 kg/. cm 2 and a bonding time of 5 seconds to obtain a bag-like article having a bonded portion.
- the entire surface of the thermocompression-bonded portion was bonded to form a bonded portion.
- the content was placed in this bag-shaped material and heat-treated at 100° C. for 3 minutes to obtain a heat-shrinkable bag-shaped material. It was confirmed by visual inspection that the bag-like article and the content were in close contact due to heat shrinkage. Furthermore, both longitudinal ends of the joint portion of the bag were cut and the joint strength was evaluated by the method described above.
- Polyester having an intrinsic viscosity of 0.63 dl/g and a polyethylene terephthalate content of 99% or more was used as a raw material for the long-fiber nonwoven fabric.
- Spinning is performed at a spinning temperature of 285°C at a single hole discharge rate of 1.74 g/min from a spinneret with an orifice diameter of ⁇ 0.30 mm.
- Dry air is supplied at a pressure of 0.85 kg/cm 2 to an ejector placed 900 mm directly below the spinneret to draw the fiber bundle in one step, and spread the fiber bundle onto a conveyor net 1.0 m below the fiber.
- the deposition rate was adjusted so that the arrangement was random.
- the single filament fineness is 4.8 dtex
- the converted spinning speed is 3800 m/min
- the ⁇ n is 70 ⁇ 10 ⁇ 3
- the specific gravity is 1.348 g/cm 3
- the dry heat area shrinkage ratio in the longitudinal direction and the transverse direction is 1.0.
- a long fiber nonwoven fabric having a basis weight of 200 g/m 2 was obtained.
- thermocompression-bonded long-fiber nonwoven fabric was entangled on one side by needle punching at a needle density of 95/cm2 and a needle depth of 10 mm to obtain an entangled long-fiber nonwoven fabric.
- the entangled long-fiber nonwoven fabric was cut into a length of 25 cm and a width of 10 cm, preheated at 100°C for 10 seconds, folded in half, and 1 cm from the end of the long-fiber nonwoven fabric was joined at a temperature of 100°C under a joining pressure of 15 kg/. cm 2 and a bonding time of 5 seconds to obtain a bag-like article having a bonded portion.
- the entire surface of the thermo-compression bonded portion was a joint portion.
- the content was placed in this bag-shaped material and heat-treated at 100° C. for 3 minutes to obtain a heat-shrinkable bag-shaped material. Although the heat shrinkage was weak, it was confirmed by visual inspection that the bag-like article and the contents were in close contact. Furthermore, both longitudinal ends of the joint portion of the bag were cut and the joint strength was evaluated by the method described above.
- Polyester having an intrinsic viscosity of 0.63 dl/g and a polyethylene terephthalate content of 99% or more was used as a raw material for the long-fiber nonwoven fabric.
- Spinning is performed at a spinning temperature of 285°C at a single hole discharge rate of 1.74 g/min from a spinneret with an orifice diameter of ⁇ 0.30 mm.
- Dry air is supplied at a pressure of 2.30 kg/cm 2 to an ejector placed 900 mm directly below the spinneret to draw the fiber bundle in one step, and spread the fiber bundle onto a conveyor net 1.0 m below the fiber.
- the deposition rate was adjusted so that the arrangement was random.
- the single filament fineness is 4.7 dtex
- the converted spinning speed is 4500 m/min
- the ⁇ n is 103 ⁇ 10 ⁇ 3
- the specific gravity is 1.370 g/cm 3
- the dry heat area shrinkage ratio in the longitudinal direction and the transverse direction is 1.05.
- a long fiber nonwoven fabric having a basis weight of 105 g/m 2 was obtained.
- embossing is performed at 60° C. and a linear pressure of 30 kN/m by an embossing roll having truncated pyramid-shaped protrusions arranged in a staggered manner with a compression area ratio of 8% installed on the inline, and a thermocompression type long-fiber nonwoven fabric.
- One side of the thermocompression-bonded long-fiber nonwoven fabric was entangled by needle punching at a needle density of 58 needles/cm 2 and a needle depth of 8 mm to obtain an entangled long-fiber nonwoven fabric.
- the entangled long-fiber nonwoven fabric was cut into a length of 25 cm and a width of 10 cm, preheated at 190°C for 10 seconds, folded in half, and 1 cm from the edge of the long-fiber nonwoven fabric was joined at a temperature of 190°C under a joining pressure of 3 kg/. cm 2 and a bonding time of 5 seconds to obtain a bag-like article having a bonded portion. Only a part of the thermocompression-bonded portion was joined to form a joined portion. The content was placed in this bag-shaped material and heat-treated at 100° C. for 3 minutes to obtain a heat-shrinkable bag-shaped material. It was not possible to visually confirm that the bag-shaped object and the contents were in close contact with each other. Furthermore, both longitudinal ends of the joint portion of the bag were cut and the joint strength was evaluated by the method described above.
- Table 1 shows the measurement results of each physical property value.
- the dry heat area shrinkage rate at 100 ° C. for 3 minutes is 30% or more
- the ethylene terephthalate component of the constituent polymer is 99% or more
- the birefringence ( ⁇ n) is 10 ⁇ 10 -3 to 60 ⁇ 10 ⁇ 3 and specific gravities of 1.335 to 1.340 g/cm 3
- Examples 1 to 3 are long-fiber nonwovens with high shrinkability and excellent strength.
- polyester with a polyethylene terephthalate content of 99% or more is used, recyclability is good.
- the present invention it is possible to provide a long-fiber nonwoven fabric with good recyclability, high shrinkability, excellent mechanical strength properties, light weight and excellent handleability, which can greatly contribute to the industrial world.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Nonwoven Fabrics (AREA)
Abstract
Description
1.ポリエチレンテレフタレート成分が99%以上の樹脂から成る長繊維不織布であり、100℃で3分間の乾熱面積収縮率が30%以上、構成繊維の複屈折率(Δn)が10×10-3~60×10-3、及び、構成繊維の比重が1.335~1.340g/cm3である、ことを特徴とする長繊維不織布。
2.縦方向と横方向との乾熱面積収縮率の比が0.95~1.05である、ことを特徴とする上記1に記載の長繊維不織布。
3.機械交絡されていることを特徴とする上記1又は2に記載の長繊維不織布。
4.上記1から3のいずれか1に記載の長繊維不織布を用いた袋状物であり、当該長繊維不織布同士が熱圧着により接合した接合部を有する、ことを特徴とする袋状物。
5.前記接合部における接合強度が、前記長繊維不織布の基布強度の3分の1以下である、ことを特徴とする上記4に記載の袋状物。
6.当該袋状物に入れる内容物と加熱収縮により密着することを特徴とする上記4または5に記載の袋状物。
本発明の長繊維不織布について説明する。本発明の長繊維不織布に用いられる樹脂は、中でもポリエステルが好ましく、汎用熱可塑性樹脂で安価なポリエチレンテレフタレート(PET)が特に好ましい。用いられる樹脂として、他には、ポリブチレンテレフタレート(PBT)、ポリブチレンナフタレート(PBN)、ポリエチレンナフタレート(PEN)、ポリシクロヘキサンジメチルテレフタレート(PCHT)、ポリトリメチオレンテレフタレート(PTT)などのホモポリエステルが例示できる。本発明では、PETを用いる。PETは、強力や耐熱性等の特性に優れているからである。なお、1質量%よりも少なければ、PET以外のポリエステルがブレンドされていてもよい。PETの固有粘度は、特に限定されないが、0.63dl/g以上が好ましい。また、本発明の長繊維不織布には、通常使用される添加剤、例えば、塗料、顔料、艶消剤、制電剤、難燃剤、強化粒子を含んでもよい。
繊維の複屈折率が60×10-3を超えると、ポリマー分子が配向し結晶化するために収縮を阻害し、収縮率が低いものとなる。複屈折率は、繊維化する際の吐出条件、冷却条件、延伸条件で制御可能である。特に高い収縮率を求める場合には、紡糸速度2000~3500m/minが好ましく、2500~3000m/minで紡糸するのがより好ましい。
次に機械交絡方法について説明する。長繊維不織布の繊維を機械交絡させる方法としてはニードルパンチまたはウォーターパンチなどの方法があるが、乾燥が不要、高い目付けが可能であることからニードルパンチが好ましい。ニードルパンチでニードルを貫入させ交絡させる。本発明の長繊維不織布は面積収縮率が高い繊維で構成されているため、フィラメント強力が低く、ニードルパンチ加工により繊維切断されやすくなる。このため、ニードルパンチ後の強度低下等の問題が起こりやすい。ペネ数や針深は使用するニードルの種類、得たい機械強力特性や目付により適宜設定する必要があり、限定されるものではない。
本発明の長繊維不織布は、熱圧着により接合させることで容易に袋状物を成形することができる。本発明の長繊維不織布を用いた袋状物も本発明の範疇である。本発明の袋状物は、長繊維不織布同士が熱圧着により接合した接合部を有する。本発明の袋状物は、前記接合部の接合強度が、前記長繊維不織布の強度の3分の1以下が好ましい。この範囲であると、袋状物を接合部から開きたい場合には容易に開くことが可能となる。また袋状物は、袋状物に入れる内容物と加熱収縮により密着させられることができる。
初めに、特性評価方法について説明する。
JIS L 1913(2010)の6.10に準拠し、長繊維不織布を任意の10箇所で250mm角に裁断し、たて方向およびよこ方向それぞれ3箇所に200mm長さを表す印をつける。恒温乾燥機にて100℃で3分間熱処理し、熱処理前後での寸法変化により、面積収縮率を求める。
長繊維不織布から取り出した単繊維について、ベレックコンペンセーターを装着した偏向顕微鏡を用いてレターデーションと繊維径とを求め、n=5の平均値を繊維の複屈折率(Δn)とする。
密度勾配管を用いて繊維の比重をn=4で測定し、平均値を求める。
JIS L 1913(2010)の6.10に準拠し、長繊維不織布を任意の10箇所で250mm角に裁断したサンプルを用いて、たて方向およびよこ方向それぞれ3箇所に200mm長さを表す印をつける。サンプルを恒温乾燥機100℃で3分間熱処理し、熱処理前後での寸法変化より、縦方向/横方向の比を求める。
交絡処理した長繊維不織布からサンプルを2枚カットし、ヒートシーラー(富士インパルス(株)製 Auto Sealer FA-450-5W系)を用いて幅方向に268℃で2分間ヒートシールを行う。このヒートシールしたサンプルを広げたものを、JIS L 1913(2010)の6.3 引張強さ及び伸び率(ISO法)に従い、定速伸長型引張試験機(オリエンテック製テンシロン)と同試験機を用いて、サンプルの製品巾から巾50mm長さ200mm試料片3点につき、つかみ間隔100mmで引張り、速度200mm/分で測定し、得られた引張強さの平均値を接合強度(N/5cm)とする。
交絡処理した長繊維不織布をJIS L 1913(2010)記載の方法に準拠し、20cm×20cmのサイズで測定し、単位面積当たりの質量を測定する。
交絡処理した長繊維不織布を用い、JIS L 1913(2010)の6.3 引張強さ及び伸び率(ISO法)に従い、定速伸長型引張試験機(オリエンテック製テンシロン)と同試験機を用いて、不織布の製品巾から巾50mm長さ200mmの試料片5点につき、つかみ間隔100mmで引張り、速度200mm/分で測定し得られた引張強さの平均値を、基布強度(N/5cm)とする。
不織布の原料として固有粘度0.63dl/gのポリエチレンテレフタレート成分99%以上のポリエステルを使用した。紡糸温度285℃にてオリフィス径φ0.30mmの紡糸口金より単孔吐出量1.74g/minで紡出し、紡糸口金直下120mmより風速0.75m/secの20℃空気にて冷却しつつ、紡糸口金直下900mmの位置に配したエジェクタに0.85kg/cm2の圧力で乾燥エアを供給し、1段階で延伸させ、下方1.0
mの位置のコンベアネット上へ繊維束を開繊させつつ繊維配列がランダムになるように速度調整して堆積させた。単糸繊度が6.0dtex、換算した紡糸速度が2800m/min、Δnが41×10-3、比重が1.338g/cm3、縦方向と横方向の乾熱面積収縮率の比が1.01、目付が200g/m2の長繊維不織布を得た。
長繊維不織布の原料として固有粘度0.63dl/gのポリエチレンテレフタレート成分99%以上のポリエステルを使用した。紡糸温度285℃にてオリフィス径φ0.30mmの紡糸口金より単孔吐出量1.74g/minで紡出し、紡糸口金直下120mmより風速0.75m/secの20℃空気にて冷却しつつ、紡糸口金直下900mmの位置に配したエジェクタに0.85kg/cm2の圧力で乾燥エアを供給し、1段階で延伸させ、下方1.0mの位置のコンベアネット上へ繊維束を開繊させつつ繊維配列がランダムになるように速度調整して堆積させた。単糸繊度が6.0dtex、換算した紡糸速度が2800m/min、Δnが41×10-3、比重が1.338g/cm3、縦方向と横方向の乾熱面積収縮率の比が1.01、目付が200g/m2の長繊維不織布を得た。
長繊維不織布の原料として、固有粘度0.63dl/gのポリエチレンテレフタレート成分99%以上のポリエステルを使用した。紡糸温度285℃にてオリフィス径φ0.30mmの紡糸口金より単孔吐出量1.74g/minで紡出し、紡糸口金直下120mmより風速0.75m/secの20℃空気にて冷却しつつ、紡糸口金直下900mmの位置に配したエジェクタに0.85kg/cm2の圧力で乾燥エアを供給し、1段階で延伸させ、下方1.0mの位置のコンベアネット上へ繊維束を開繊させつつ繊維配列がランダムになるように速度調整して堆積させた。単糸繊度が6.7dtex、換算した紡糸速度が2500m/min、Δnが48×10-3、比重が1.335g/cm3、縦方向と横方向の乾熱面積収縮率の比が1.02、目付が150g/m2の長繊維不織布を得た。
長繊維不織布の原料として、固有粘度0.63dl/gのポリエチレンテレフタレート成分99%以上のポリエステルを使用した。紡糸温度285℃にてオリフィス径φ0.30mmの紡糸口金より単孔吐出量1.74g/minで紡出し、紡糸口金直下120mmより風速0.75m/secの20℃空気にて冷却しつつ、紡糸口金直下900mmの位置に配したエジェクタに0.85kg/cm2の圧力で乾燥エアを供給し、1段階で延伸させ、下方1.0mの位置のコンベアネット上へ繊維束を開繊させつつ繊維配列がランダムになるように速度調整して堆積させた。単糸繊度が4.8dtex、換算した紡糸速度が3800m/min、Δnが70×10-3、比重が1.348g/cm3、縦方向と横方向の乾熱面積収縮率の比が1.05、目付が200g/m2の長繊維不織布を得た。
長繊維不織布の原料として、固有粘度0.63dl/gのポリエチレンテレフタレート成分99%以上のポリエステルを使用した。紡糸温度285℃にてオリフィス径φ0.30mmの紡糸口金より単孔吐出量1.74g/minで紡出し、紡糸口金直下120mmより風速0.75m/secの20℃空気にて冷却しつつ、紡糸口金直下900mmの位置に配したエジェクタに2.30kg/cm2の圧力で乾燥エアを供給し、1段階で延伸させ、下方1.0mの位置のコンベアネット上へ繊維束を開繊させつつ繊維配列がランダムになるように速度調整して堆積させた。単糸繊度は4.7dtex、換算した紡糸速度は4500m/min、Δn103×10-3、比重1.370g/cm3、縦方向と横方向の乾熱面積収縮率の比が1.05からなる目付105g/m2の長繊維不織布を得た。
Claims (6)
- ポリエチレンテレフタレート成分が99%以上の樹脂から成る長繊維不織布であり、
100℃で3分間の乾熱面積収縮率が30%以上、
構成繊維の複屈折率(Δn)が10×10-3~60×10-3、及び、
構成繊維の比重が1.335~1.340g/cm3である、ことを特徴とする長繊維不織布。 - 縦方向と横方向との乾熱面積収縮率の比が0.95~1.05である、ことを特徴とする請求項1に記載の長繊維不織布。
- 機械交絡されていることを特徴とする請求項1又は2に記載の長繊維不織布。
- 請求項1又は2に記載の長繊維不織布を用いた袋状物であり、
当該長繊維不織布同士が熱圧着により接合した接合部を有する、ことを特徴とする袋状物。 - 前記接合部における接合強度が、前記長繊維不織布の基布強度の3分の1以下である、ことを特徴とする請求項4に記載の袋状物。
- 当該袋状物に入れる内容物と加熱収縮により密着する、ことを特徴とする請求項4に記載の袋状物。
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JPS6269872A (ja) * | 1985-09-17 | 1987-03-31 | 旭化成株式会社 | 収縮性不織シ−ト |
JPS63235560A (ja) * | 1987-03-23 | 1988-09-30 | 旭化成株式会社 | 熱収縮性不織シ−トとその製造方法 |
JPH082552A (ja) * | 1994-06-20 | 1996-01-09 | Unitika Ltd | 熱収縮性包装材及びこの包装材を用いた包装方法 |
JP2003336151A (ja) | 2002-05-13 | 2003-11-28 | Toyobo Co Ltd | 高収縮不織布及びその使用方法 |
JP2014240531A (ja) | 2013-06-11 | 2014-12-25 | 東洋紡株式会社 | 低温で高収縮な長繊維不織布 |
WO2020116569A1 (ja) * | 2018-12-07 | 2020-06-11 | 東洋紡株式会社 | 長繊維不織布およびそれを用いたフィルター補強材 |
JP2020190072A (ja) * | 2020-08-26 | 2020-11-26 | 東洋紡株式会社 | スパンボンド不織布およびそれを用いた成型体の製造方法 |
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JPS60194159A (ja) * | 1984-03-15 | 1985-10-02 | 旭化成株式会社 | ポリエステル長繊維不織布およびその製造法 |
JPS6269872A (ja) * | 1985-09-17 | 1987-03-31 | 旭化成株式会社 | 収縮性不織シ−ト |
JPS63235560A (ja) * | 1987-03-23 | 1988-09-30 | 旭化成株式会社 | 熱収縮性不織シ−トとその製造方法 |
JPH082552A (ja) * | 1994-06-20 | 1996-01-09 | Unitika Ltd | 熱収縮性包装材及びこの包装材を用いた包装方法 |
JP2003336151A (ja) | 2002-05-13 | 2003-11-28 | Toyobo Co Ltd | 高収縮不織布及びその使用方法 |
JP2014240531A (ja) | 2013-06-11 | 2014-12-25 | 東洋紡株式会社 | 低温で高収縮な長繊維不織布 |
WO2020116569A1 (ja) * | 2018-12-07 | 2020-06-11 | 東洋紡株式会社 | 長繊維不織布およびそれを用いたフィルター補強材 |
JP2020190072A (ja) * | 2020-08-26 | 2020-11-26 | 東洋紡株式会社 | スパンボンド不織布およびそれを用いた成型体の製造方法 |
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