WO2013099674A1 - Tissu non tissé et son procédé de fabrication - Google Patents

Tissu non tissé et son procédé de fabrication Download PDF

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Publication number
WO2013099674A1
WO2013099674A1 PCT/JP2012/082651 JP2012082651W WO2013099674A1 WO 2013099674 A1 WO2013099674 A1 WO 2013099674A1 JP 2012082651 W JP2012082651 W JP 2012082651W WO 2013099674 A1 WO2013099674 A1 WO 2013099674A1
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WIPO (PCT)
Prior art keywords
nonwoven fabric
web
fibers
small fiber
less
Prior art date
Application number
PCT/JP2012/082651
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English (en)
Japanese (ja)
Inventor
坂　渉
舛木　哲也
Original Assignee
花王株式会社
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Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN201280056980.6A priority Critical patent/CN103946434B/zh
Priority to RU2014129846/12A priority patent/RU2552908C1/ru
Publication of WO2013099674A1 publication Critical patent/WO2013099674A1/fr

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00—Heating or cooling textile fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/413—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties containing granules other than absorbent substances
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/54—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by welding together the fibres, e.g. by partially melting or dissolving
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
    • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B5/00—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating
    • D06B5/02—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through moving materials of indefinite length
    • D06B5/08—Forcing liquids, gases or vapours through textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing impregnating through moving materials of indefinite length through fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C15/00—Calendering, pressing, ironing, glossing or glazing textile fabrics
    • D06C15/02—Calendering, pressing, ironing, glossing or glazing textile fabrics between co-operating press or calender rolls

Definitions

  • the present invention relates to a nonwoven fabric and a method for producing the same.
  • the air-through nonwoven fabric has a feature that it is soft to the touch as compared with a nonwoven fabric manufactured by the heat embossing method because a heat-sealed part is formed at the intersection of fibers.
  • the air-through nonwoven fabric has a greater thickness, so it has a soft touch and is still soft. Accordingly, an air-through nonwoven fabric is suitable as the nonwoven fabric used for the portion that touches the skin.
  • Titanium dioxide is known as one of the representative pigments. However, since titanium dioxide only colors the fibers white, it is difficult to impart a pattern even if the entire nonwoven fabric can be uniformly whitened. Moreover, when titanium dioxide is kneaded into a fiber, the spinnability of the fiber tends to deteriorate. In addition, when the fiber in which titanium dioxide is kneaded is incinerated as waste, titanium dioxide remains as a burnout, and there is a problem with respect to zero emission.
  • a technique is known in which a nonwoven fabric made of fibers to which titanium dioxide is added to some extent is compressed by embossing to make the embossed part (seal part) cloudy, thereby improving reflectivity and concealment (see Patent Document 2).
  • this technique uses embossing, there is a problem that the touch of the nonwoven fabric deteriorates.
  • the pattern formed by embossing is not easily recognized as a pattern due to its fineness and regular arrangement, and is only recognized as a whitish non-woven fabric as a whole.
  • This invention relates to the nonwoven fabric manufactured by the air through method.
  • a plurality of small fiber masses that are darker than the formation of the non-woven fabric are dispersed and arranged in the form of dots over the entire area of the non-woven fabric.
  • the non-woven fabric was measured under the same pressure at the position where the small fiber lump was disposed, where T1 was the thickness of the non-woven fabric measured at 7.64 kPa at the position where the small fiber lump was disposed.
  • the present invention also relates to a method for producing a non-woven fabric comprising a step of forming a web by a card method using short fibers as a raw material and then blowing hot air to the web by an air-through method to fuse the intersections of the fibers.
  • the method for producing the non-woven fabric is obtained by fusing fibers together to obtain an air-through non-woven fabric, and then using a pair of smooth rolls and setting the linear pressure between the rolls to 100 N / cm or more and 1500 N / cm or less.
  • the nonwoven fabric is subjected to calendering to reduce the difference in thickness between the position where the small fiber mass is arranged and the position where the small fiber mass is not arranged.
  • FIG. 1 is a plan view showing an embodiment of the nonwoven fabric of the present invention.
  • FIG. 2 is a schematic view showing an apparatus suitably used for producing the nonwoven fabric shown in FIG.
  • FIG. 3 is a plan view showing an embodiment of the nonwoven fabric of the present invention.
  • FIG. 4 is a diagram illustrating a main part of the card machine in the nonwoven fabric manufacturing apparatus used in the examples.
  • FIG. 10 The top view of one Embodiment of the nonwoven fabric based on this invention is shown by FIG.
  • the nonwoven fabric 10 shown in the figure is manufactured by the air-through method.
  • the air-through method is a method in which hot air is blown to a fiber web containing heat-fusible fibers produced by various web production methods to fuse the intersections of the heat-fusible fibers in the web.
  • a method of forming a nonwoven fabric As shown in the figure, in the non-woven fabric 10, the deeply formed portions 20 and the thinly formed portions 21 are alternately extended in stripes with irregular widths and lengths.
  • the direction in which the deep portion 20 and the thin portion 21 extend generally coincides with the flow direction (MD) when the nonwoven fabric 10 is manufactured.
  • the term “geometry” refers to the distribution of constituent fibers and the color tone on the appearance resulting from the distribution among the quality of the nonwoven fabric.
  • the nonwoven fabric 10 is often white due to the material of the constituent fibers and the like, but the portion 20 having a deep formation looks relatively dark white.
  • the part 21 with a thin formation looks relatively light white.
  • the deep part 20 and the thin part 21 do not need to extend over the entire length of the nonwoven fabric, and may be intermittent. In the case of being intermittent, the extension length of the dark portion 20 and the extension length of the thin portion 21 may be the same or different. Further, the deep portion 20 and the thin portion 21 need not have a constant width along the extending direction. Rather, it is preferable that the width changes irregularly because the visual aesthetics become remarkable. The width of the dark portion 20 and the width of the thin portion 21 may be the same or different.
  • the portion 20 having a deep formation and the portion 21 having a thin formation are generally caused by the basis weight difference of the nonwoven fabric due to the distribution state of the constituent fibers.
  • the dense part 20 has a higher density of constituent fibers than the thin part 21, and as a result, the basis weight is relatively high.
  • the portion 21 with a low formation has a lower distribution density of the constituent fibers than the portion 20 with a high formation, and as a result, the basis weight is relatively low. It is not necessary for the dense portions 20 that exist in the nonwoven fabric 10 to have the same basis weight. Similarly, a plurality of thin portions 21 in the nonwoven fabric 10 need not have the same basis weight.
  • the portion 20 with a deep formation has a relatively higher basis weight than the portion 21 with a thin formation. There is no difference as much as the amount.
  • the ratio of the thickness of the dark part 20 and the thin part 21 is the thin part 20 and the thin part. The ratio is smaller than the ratio of the basis weight to the part 21 (basis weight of the part 20 having a deep formation / basis weight of the part 21 having a low formation), specifically, 1 ⁇ 2 or less.
  • the ratio of the thickness of the dense part 20 and the thin part 21 being not as different as the basis weight ratio of the dense part 20 and the thin part 21, the dense part
  • the light transmittance of 20 is relatively lower than that of the thin portion 21. Due to this, the dark portion 20 appears to be relatively whiter than the light portion 21.
  • the nonwoven fabric 10 is provided with a plurality of small fiber masses 30 that are darker than the formation of the nonwoven fabric 10.
  • the small fiber mass 30 has an irregular shape, and its outline and size are various. Further, the small fiber masses 30 are irregularly distributed in a scattered manner over the entire area of the nonwoven fabric 10.
  • the fibril mass 30 can be located on the dark portion 20. It can also be located on the thin part 21 of the formation. Or it can also be located so that the site
  • the fibril mass 30 Since the fibril mass 30 is in such a shape, size and arrangement, the fibril mass 30 exhibits a cloud-like pattern scattered on the ground of the nonwoven fabric 10, thereby forming the nonwoven fabric.
  • No. 10 has the appearance of a cloud paper that is a kind of Japanese paper.
  • the small fiber lump 30 is composed of a dense aggregate of the constituent fibers of the nonwoven fabric 10.
  • the basis weight is higher than the other parts of the nonwoven fabric 10.
  • the small fiber lump 30 has a lower light transmittance than other portions of the nonwoven fabric 10, and as a result, the fibril mass 30 has a darker color than the formation of the nonwoven fabric 10.
  • the nonwoven fabric 10 is generally white
  • the small fiber mass 30 has a darker white color than other parts of the nonwoven fabric 10.
  • the small fiber mass 30 may have a higher degree of fusion at the intersection of the constituent fibers than the other portions of the nonwoven fabric 10. By increasing the degree of fusion, the dark color (the dark white degree) of the fibril mass 30 is further increased.
  • the fibers constituting the small fiber mass 30 have fine irregularities such as fine wrinkles and / or fine cracks on the surface thereof. It is preferable.
  • the constituent fiber of a general nonwoven fabric is made of a synthetic resin having fiber forming ability, and the surface of such a fiber is usually smooth, but by forming fine irregularities on the surface of the fiber, light is emitted to the irregularities. Due to irregular reflection, the dark color of the small fiber mass 30 becomes more prominent. The formation of irregularities on the fiber surface can be confirmed by electron microscope observation of the fiber surface. Moreover, in order to form an unevenness
  • the size of the small fiber mass 30 when the nonwoven fabric 10 is viewed in plan varies. However, since the presence of an excessively large fibril mass 30 may not lead to an improvement in the appearance of the nonwoven fabric, the size of the fibril mass 30 should be within a certain range. Is preferred. From this viewpoint, for example, the equivalent circle diameter of the small fiber mass 30 by image analysis of the nonwoven fabric 10 in a plan view is preferably 0.5 mm or more and 30 mm or less, more preferably 1 mm or more and 15 mm or less, and the standard deviation at that time Is preferably 1 mm or more and 30 mm or less, and more preferably 4 mm or more and 15 mm or less.
  • the fibril lump 30 is at least 1, preferably 1 to 600, more preferably 10 to 300, and still more preferably 32 to 100 in a 10 cm square region of the nonwoven fabric 10.
  • the following arrangement is preferable from the viewpoint of improving the aesthetic appearance due to the small fiber mass 30.
  • the reflectance per unit basis weight is measured under the following measurement conditions using, for example, a color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd., and the reflectance calculated from the following formula is calculated based on the basis weight (g / M 2 ).
  • the nonwoven fabric 10 has the deep portion 20 and the thin portion 21 and the small fiber masses 30 are arranged in the form of scattered dots. Express the pattern. Moreover, since the nonwoven fabric 10 is manufactured by an air-through method, it is bulky, flexible, and has a good touch. Therefore, the nonwoven fabric 10 is particularly useful as a material constituting the outermost surface of various articles. For example, it is suitably used as a layer constituting the outermost surface of a disposable wearing article such as a disposable diaper or a disposable medical garment.
  • the basis weight of the nonwoven fabric 10 is generally 6 g / m 2 or more and 100 g / m 2 or less, particularly preferably 15 g / m 2 or more and 30 g / m 2 or less.
  • the nonwoven fabric 10 was measured under a pressure of 7.64 kPa at the position where the small fiber mass 30 was arranged (the tip of the probe is a disk and the diameter is 5 mm).
  • the thickness difference T3 defined by T3 T1 ⁇ T2 is 1 mm, where T1 is T1 and T2 is the thickness of the nonwoven fabric 10 measured under the same pressure at the position where the small fiber mass 30 is not disposed. It is as follows. That is, the thickness difference between the position where the small fiber mass 30 is arranged and the other positions is small.
  • the small fiber mass 30 is a mass in which the constituent fibers of the non-woven fabric 10 are densely gathered, there is a tendency to exhibit a hard feel, so that the difference between the thickness T2 and the thickness T1 is reduced.
  • T3 is 0 mm or more, preferably 0.1 mm or less, and more preferably 0.05 mm or less.
  • the thicknesses T1 and T2 of the nonwoven fabric 10 are measured using, for example, a dial gauge thickness gauge (JIS B-7503 (1997), UPRIHT DIAL GAUGE, No. 25, measuring element 5 mm ⁇ flat type manufactured by PEACOCK) under the pressure described above. Is done. The measurement is performed at 10 points or more for each of T1 and T2. Then, the arithmetic average value of T1 and the arithmetic average value of T2 are calculated, and the difference between them is T3.
  • a dial gauge thickness gauge JIS B-7503 (1997), UPRIHT DIAL GAUGE, No. 25, measuring element 5 mm ⁇ flat type manufactured by PEACOCK) under the pressure described above. Is done. The measurement is performed at 10 points or more for each of T1 and T2. Then, the arithmetic average value of T1 and the arithmetic average value of T2 are calculated, and the difference between them is T3.
  • Examples of the constituent fibers of the nonwoven fabric 10 include heat-fusible fibers.
  • Examples of the heat-fusible fiber include a bicomponent composite fiber composed of a low-melting point resin and a high-melting point resin, and the low-melting point resin forms a part in the fiber length direction. Specific examples include core-sheath type composite fibers and side-by-side type composite fibers.
  • the thickness of these fibers depends on the specific use of the nonwoven fabric 10, it is preferably 0.5 dtex or more and 8 dtex or less, particularly preferably 0.5 dtex or more and 3.0 dtex or less. In particular, by using fine fibers, the small fiber mass 30 can be successfully formed.
  • a thin fiber of 0.5 dtex or more and 2.5 dtex or less more preferably a thin fiber of 0.5 dtex or more and 1.5 dtex or less, and a thin fiber of 0.8 dtex or more and 1.2 dtex or less. More preferably, fibers are used.
  • Examples of the combination of the low melting point resin and the high melting point resin constituting the two-component composite fiber include polyethylene terephthalate (PET) / polyethylene (PE), polypropylene (PP) / polyethylene (PE), and the like.
  • the nonwoven fabric 10 may contain only the heat-fusible fibers described above, or may contain fibers other than the fibers in addition to the heat-fusible fibers. Examples of such fibers include fibers having no heat fusibility such as cotton and rayon. When the nonwoven fabric 10 contains fibers other than the heat-fusible fibers, the proportion of the fibers in the nonwoven fabric 10 is preferably 50% by mass or less.
  • a white pigment is kneaded into the constituent fibers of the nonwoven fabric 10 to increase the whiteness of the nonwoven fabric 10, resulting in a pattern caused by the small fiber mass 30, a dark portion 20, and a thin portion 21.
  • the pattern may be more prominent.
  • titanium oxide can be used as a white pigment.
  • the white pigment is preferably contained in an amount of 0.1% by mass or more and 5.0% by mass or less, more preferably 1.5% by mass or more and 4.0% by mass or less based on the mass of the entire fiber.
  • the nonwoven fabric 10 is manufactured by a method using a card machine, which will be described later, it is preferable to use short fibers having a fiber length of 20 mm to 75 mm, particularly 45 mm to 75 mm as the constituent fibers.
  • the nonwoven fabric 10 is basically composed of a single layer of nonwoven fabric obtained by the air-through method. However, the nonwoven fabric 10 includes other nonwoven fabrics and films as long as the appearance pattern of the nonwoven fabric 10 is not impaired. You may be in the state laminated
  • FIG. 2 shows an apparatus 100 suitably used for manufacturing the nonwoven fabric 10.
  • the apparatus 100 includes a raw cotton opening part 110, a web forming part 120, a hot air blowing part 130, and a calendering part 140 from the upstream side toward the downstream side.
  • the raw cotton opening part 110 is an opener 111 that opens the fibers that are the raw material of the nonwoven fabric 10 and an endless belt that conveys the fiber opening 11 of the fibers opened by the opening machine 111 to the web forming part 120.
  • a conveyance belt 112 is provided.
  • the web forming unit 120 includes a card machine.
  • a card machine for example, a parallel card machine, a semi-random card machine, a random card machine, or a parallel card machine in which a cross layer and a drafter are combined is used.
  • a parallel card machine that is a card machine that can easily form the dark portion 20 and the thin portion 21.
  • the card machine has a feed roller 121, a take-in roller 122, a pre-cylinder 123, a transformer roller 124, a main cylinder 127 having a plurality of workers 125 and a stripper 126 arranged on the peripheral surface, a doffer 128 and a condenser roller 129 in this order. Configured.
  • the rotation direction of each roller is the direction shown by the arrow in FIG.
  • the opened body 11 transported by the transport belt 112 is carded while being transferred by each roller in the card machine to form the web 12 and is taken out on the take-up conveyor 131.
  • the feed roller 121 and the take-in roller 122 are rollers that supply the spread body 11 that has been transported by the transport belt 112 to the pre-cylinder 123.
  • the pre-cylinder 123 is a roller that preliminarily opens the opened body 11 before supplying the opened body 11 to the main cylinder 127.
  • a stripper 150 and a worker 151 are disposed on the circumferential surface of the pre-cylinder 123. One stripper 150 and one worker 151 form one set, and a plurality of sets of strippers 150 and workers 151 are arranged.
  • the transformer roller 124 is a roller that adjusts the supply amount of the spread body 11 to the main cylinder 127 according to the rotation speed.
  • the main cylinder 127 and a plurality of pairs of workers 125 and strippers 126 on the peripheral surface thereof are transferred to the worker 125 of the opened body 11 supplied to the main cylinder 127 and the opened body 11 transferred to the worker 125. This is the part where the spread body 11 is opened by repeating the return to the main cylinder 127 by the stripper 126.
  • the doffer 128 receives the web on the main cylinder 127 that rotates at a high speed at a low speed to increase the basis weight of the web.
  • the condenser roller 129 rotates at a lower speed than the doffer 128, receives the web on the doffer 128, adjusts the shape of the web, and adjusts the delivery of the web to the transfer speed of the take-up conveyor 131.
  • the doffer 128 and the condenser roller 129 randomize the fiber arrangement by repeatedly delivering the web.
  • the hot air blowing unit 130 includes a hood 132 and a conveyor belt 133 made of a breathable net that circulates in the hood 132. Inside the hood 132, hot air is blown toward the conveyor belt 133 in the direction of the arrow in FIG.
  • the conveyor belt 133 is made of a resin such as metal or polyethylene terephthalate.
  • the hot air blowing unit 130 includes a transport belt 134 that is an endless belt that transports the web 12 taken out on the take-up conveyor 131 into the hood 132.
  • the calendar processing unit 140 includes a pair of calendar rollers 141 and 142 whose peripheral surfaces are smooth.
  • the calendar rollers 141 and 142 are made of, for example, metal, rubber, paper, or the like.
  • the calendar rollers 141 and 142 may be made of the same material or different materials. Of the calendar rollers 141 and 142, one of them is preferably made of metal and the other is made of paper.
  • a preferred method of manufacturing the nonwoven fabric 10 using the manufacturing apparatus 100 having such a configuration will be described with reference to FIG.
  • the raw fiber for example, a short fiber of heat-fusible fiber made of a two-component composite fiber is used. Furthermore, it is also preferable to use a short fiber obtained by subjecting a non-woven fabric to a defibrating treatment as a part of the raw short fiber.
  • the cut end of the nonwoven fabric refers to a portion generated by cutting, with a slitter, an unfavorable formation that occurs in the left and right side regions in the flow direction during production of the nonwoven fabric. Such cuts are usually discarded, but in the present invention, the above-described small fiber mass 30 is efficiently generated in the nonwoven fabric 10 by reusing it.
  • the cut end of the nonwoven fabric may be produced in the production process of the nonwoven fabric of the present invention, or may be produced in the production process of another type of nonwoven fabric. From the standpoint that the types of raw materials are the same, it is preferable to use cuts generated in the process of manufacturing the nonwoven fabric of the present invention. As will be described later, it is not essential to use a cut end of the nonwoven fabric as the raw fiber, and a small fiber mass can be produced in the nonwoven fabric without using the end cut.
  • the above-mentioned non-woven fabric end cut is subjected to defibrating treatment and returned to short fibers again as a part of the raw fiber.
  • Short fibers are regenerated by subjecting the end of the nonwoven fabric to defibration treatment, but it is not easy to reliably perform defibration. Some bonds (fusion, etc.) remain.
  • a defibrator can be used for defibrating the cut ends.
  • a defibrating machine the same ones conventionally used in the technical field can be used.
  • a defibrating device there can be used a device having a feed roll for supplying a piece of nonwoven fabric and a garnet cylinder around which a saw-like wire is wound and further provided with a blowing mechanism.
  • the ratio of the short fibers regenerated from the cut ends to the raw fiber is preferably 1% by mass or more and 40% by mass or less, particularly preferably 3% by mass or more and 30% by mass or less. .
  • the ratio of the regenerated fibers from the cut ends may be controlled.
  • the opened body 11 obtained by opening the raw fiber in the raw cotton opening section 110 is conveyed to the web forming section 120 by the conveying belt 112, and the web 12 is formed.
  • the spread body 11 is supplied to the pre-cylinder 123 via the feed roller 121 and the take-in roller 122 and pre-opened.
  • the pre-opened opened body 11 is peeled off from the pre-cylinder 123 by the transformer roller 124 and supplied to the main cylinder 127. And with respect to the spread body 11 supplied on the main cylinder 127, using the plurality of workers (four pairs in FIG.
  • the operating condition of the card machine in this manufacturing method is characterized in that the circumferential speed S2 of the worker 125 is very slow relative to the circumferential speed S1 of the main cylinder 127. That is, the characteristic is that the value of S1 / S2 is smaller than the conventional operating condition of the card machine. Specifically, the value of S1 / S2 is preferably set to 2/1000 or more and 80/1000 or less, more preferably 5/1000 or more and 50/1000 or less.
  • the peripheral speed itself of the worker 125 is preferably 70 m / min or less, more preferably 50 m / min or less, and even more preferably 30 m / min or less.
  • the operating condition of the card machine in this manufacturing method is one of the features that the clearance between the pre-cylinder 123 and the worker 151 is small.
  • the clearance between the worker located on the most upstream side and the pre-cylinder 123 is preferably 0.1 mm or more, particularly preferably 0.3 mm or more. 1.0 mm or less, particularly 0.8 mm or less, more preferably 0.5 mm or less.
  • the clearance between the plurality of workers 151 arranged in the pre-cylinder 123 and the pre-cylinder 123 is set so as to become narrower in order from the worker 151 arranged on the upstream side to the worker 151 arranged on the downstream side. It is normal.
  • the clearance between the worker 151 located on the most upstream side and the pre-cylinder 123 is set to be narrower than the clearance between the worker 151 located on the immediate downstream side and the pre-cylinder 123, the end of the nonwoven fabric is not used as the raw fiber.
  • the small fiber mass 30 can be successfully formed in the web 12.
  • the non-woven fabric end cut is used as the raw fiber, the small fiber mass 30 can be formed more successfully by adopting this operating condition. Furthermore, by adopting this operating condition, it becomes easy to form the portion 20 having a deep formation and the portion 21 having a low formation in the web 12.
  • a web 12 is obtained in which dark portions and thin portions are formed along the flow direction (MD), and small fiber masses are randomly arranged.
  • the web 12 is conveyed to the hot air blowing unit 130.
  • hot air heated to a predetermined temperature is directed toward the upper surface thereof, that is, the surface opposite to the surface facing the conveyor belt 133. Sprayed through. That is, air through processing is performed. Heat is applied to the web 12 by blowing hot air, and the intersections of the fibers are fused.
  • the temperature and wind speed of the hot air blown onto the web 12 are appropriately selected according to the melting point of the constituent resin of the heat-fusible fiber and the basis weight of the web 12.
  • the temperature of the hot air is preferably set to about 125 ° C. to 145 ° C.
  • the wind speed is preferably set to about 0.5 m / s to 3 m / s.
  • the preliminary nonwoven fabric 13 is obtained by being subjected to the treatment by the hot air blowing unit 130.
  • the preliminary nonwoven fabric 13 is an air-through nonwoven fabric.
  • the portion where the small fiber lump is disposed has a harder feel than the other portions of the preliminary nonwoven fabric 13 due to the denseness of the fibers and the close fusion between the fibers. Further, the contrast between the dark part and the thin part is not sufficiently clear. Therefore, for the purpose of reducing the hardness of the portion where the small fiber mass is arranged and sufficiently clarifying the contrast between the dark portion and the thin portion, the preliminary nonwoven fabric 13 in the calendering section 140 is used. To calendar processing.
  • the calender rollers 141 and 142 used for calendering may be used without being heated, or may be used in a heated state. From the viewpoint of reducing the hardness of the portion where the small fiber mass is disposed, it is preferable to use the calendar rollers 141 and 142 without heating. In this case, the surface temperature of the calendar rollers 141 and 142 is room temperature or is slightly higher than room temperature due to friction.
  • the linear pressure applied to the preliminary nonwoven fabric 13 sandwiched between the calendar rollers 141 and 142 is preferably 100 N / cm or more, particularly 300 N / cm or more, more preferably 700 N / cm or more, preferably 1500 N / cm or less, particularly 1300 N / cm.
  • part with a thin formation can fully be clarified.
  • the calendar rollers 141 and 142 can perform processing with the peripheral speed set to be the same.
  • a speed difference may be provided for the peripheral speed.
  • the peripheral speed of the calendar roller of the slower of the peripheral speed of v 1 the peripheral speed of the calendar roller of faster peripheral speeds were and v 2, (v 2 -v 1 ) / v 1
  • x100 calendar roll speed ratio
  • the circumferential speed of either calendar roller may be increased.
  • the metal calendar Increasing the peripheral speed of the roller is preferable from the viewpoint of ensuring the conveyance stability.
  • the target nonwoven fabric 10 is obtained by subjecting the preliminary nonwoven fabric 13 to calendering.
  • the non-woven fabric 10 thus obtained has stripe portions 20 having a deep texture and thin portions 21 having an irregular width and length alternately along the flow direction (MD) in the manufacturing process. It will extend in the shape. Further, the plurality of small fiber masses 30 having an irregular shape that is darker than the formation of the nonwoven fabric 10 are irregularly distributed in a scattered manner over the entire area of the nonwoven fabric 10.
  • the nonwoven fabric which has a pattern which does not depend on printing and the kneading of a pigment can be easily manufactured, without impairing the favorable touch which an air through nonwoven fabric has inherently.
  • the environmental load can be reduced and it is economical.
  • this invention was demonstrated based on the preferable embodiment, this invention is not restrict
  • one-stage calendering is performed, but two or more calendering processes may be performed as necessary.
  • the dark portion and the thin portion of the formation are alternately extended in stripes with irregular widths and lengths, And a nonwoven fabric in which a plurality of small fiber masses having an irregular shape that is darker than the ground are irregularly distributed in a scattered manner over the entire area of the nonwoven fabric, and a ground as shown in FIG.
  • the doffer 128 in the nonwoven fabric manufacturing apparatus 100 shown in FIG. 2 is preferably a single doffer as shown in the figure, but a double doffer type apparatus is also preferably used.
  • the number of card machines used for manufacturing the web is one in FIG. 2, but a plurality of card machines, for example, two or three card machines may be used.
  • This invention discloses the manufacturing method of the following nonwoven fabrics and nonwoven fabrics further regarding embodiment mentioned above.
  • a nonwoven fabric produced by an air-through method In the non-woven fabric, a plurality of small fiber masses that are darker than the formation of the non-woven fabric are dispersed and arranged in a scattered manner over the entire area of the non-woven fabric, The thickness of the nonwoven fabric measured under a pressure of 7.64 kPa at the position where the fibril mass is arranged is T1, and the thickness of the nonwoven fabric measured under the same pressure at the position where the fibril mass is not arranged.
  • a nonwoven fabric having a thickness difference T3 defined by T3 T1 ⁇ T2 of 1 mm or less when T2.
  • ⁇ 2> The nonwoven fabric according to ⁇ 1>, wherein at least one of the small fiber masses is disposed in an area of 10 cm square on average.
  • ⁇ 3> The nonwoven fabric according to ⁇ 2>, wherein the fibril mass is averagely arranged in the range of 1 to 600 in a 10 cm square area.
  • ⁇ 4> The nonwoven fabric according to ⁇ 3>, wherein the fibril mass is averagely arranged in the range of 2 to 100 in a 10 cm square area.
  • ⁇ 5> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 4>, wherein the basis weight is higher than that of other portions of the nonwoven fabric.
  • ⁇ 6> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 5>, wherein a circle-equivalent diameter of the small fiber mass by image analysis of the nonwoven fabric in a plan view is 0.5 mm or more and 30 mm or less.
  • ⁇ 7> The non-woven fabric according to any one of ⁇ 1> to ⁇ 6>, wherein in the non-woven fabric, a dark portion and a thin portion are alternately extended in a stripe shape.
  • the basis weight is relatively higher in the part where the formation is darker than the part where the formation is thin, and the ratio of the thickness between the part where the formation is thin and the part where the formation is thin is The nonwoven fabric according to any one of ⁇ 1> to ⁇ 7>, wherein the nonwoven fabric is smaller than a basis weight ratio between a dark portion and a thin portion.
  • ⁇ 9> The fiber according to any one of ⁇ 1> to ⁇ 8>, wherein the fiber constituting the fibril mass has fine irregularities such as fine wrinkles and / or fine cracks on a surface thereof.
  • ⁇ 10> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 9>, wherein the reflectance per basis weight is 1.4% / gsm or more and 5.0% / gsm or less.
  • ⁇ 11> The nonwoven fabric according to any one of ⁇ 1> to ⁇ 10>, wherein a white pigment is kneaded into the constituent fibers.
  • ⁇ 12> An absorbent article using the nonwoven fabric according to any one of ⁇ 1> to ⁇ 11> as a member.
  • ⁇ 13> The absorbent article according to ⁇ 12>, wherein the nonwoven fabric is used as an exterior material.
  • ⁇ 14> The absorbent article according to ⁇ 13>, which is a disposable diaper.
  • a method for producing a nonwoven fabric having a step of using short fibers as raw materials, forming a web by a card method, and then blowing hot air to the web by an air-through method to fuse the intersections of the fibers, After the fibers are fused to obtain an air-through nonwoven fabric, a pair of smooth rolls are used, and the linear pressure between the rolls is set to 100 N / cm or more and 1500 N / cm or less, and the air-through nonwoven fabric is subjected to calendering.
  • the manufacturing method of a nonwoven fabric which reduces the difference in thickness by the position where the small fiber lump is arrange
  • the linear pressure between the rolls is preferably set to 100 N / cm or more, particularly 300 N / cm or more, more preferably 700 N / cm or more, and 1500 N / cm or less, particularly 1300 N / cm or less, and further set to 1000 N / cm or less.
  • ⁇ 17> The manufacturing method according to ⁇ 15> or ⁇ 16>, wherein the web is formed by setting a speed of a worker in a card machine used for forming the web to 30 m / min or less.
  • a method for producing a nonwoven fabric comprising using short fibers as raw materials, forming a web by a card method, and then blowing hot air to the web by an air-through method to fuse the intersections of the fibers.
  • the speed of the worker in the card machine is set to 30 m / min or less to form a web
  • the air-through nonwoven fabric is obtained by fusing the fibers together
  • the air-through nonwoven fabric is subjected to calendering at a position where the small fiber mass is arranged and a position where the small fiber mass is not arranged.
  • a method for producing a nonwoven fabric that reduces the difference in thickness ⁇ 19> Any one of the above ⁇ 15> to ⁇ 18>, wherein a clearance between the worker located at the most upstream side among the workers arranged in the pre-cylinder and the pre-cylinder is 0.1 mm to 1.0 mm. The manufacturing method as described in.
  • the clearance between the worker located most upstream and the pre-cylinder is set to be narrower than the clearance between the worker located immediately downstream and the pre-cylinder ⁇ 15.
  • the production method according to any one of ⁇ 15> to ⁇ 19>. ⁇ 21> Using a short fiber obtained by subjecting a non-woven fabric end piece to defibration treatment as a part of the short fiber as a raw material, a plurality of irregularly shaped small pieces are formed during the formation of the web.
  • the production method according to any one of ⁇ 15> to ⁇ 20> wherein the fiber mass is irregularly distributed in a scattered manner over the entire area of the web.
  • ⁇ 22> Any one of the above ⁇ 15> to ⁇ 21>, wherein the short fiber is preferably 0.5 dtex or more and 2.5 dtex or less, more preferably 0.5 dtex or more and 1.5 dtex or less. 2.
  • ⁇ 23> Perform the calendar processing using a pair of smooth rolls, The production method according to any one of ⁇ 15> to ⁇ 22>, wherein a speed difference of 0.1% or more is set between the rolls.
  • Example 1 As the first raw fiber, a concentric core-sheath type composite fiber having a core made of PET and a sheath made of PE was used. This fiber had a length of 51 mm and contained 0.5% titanium oxide as a white pigment. Moreover, the thickness of this fiber was as shown in Table 1.
  • a core-sheath type composite fiber regenerated by defibration of the cut end of the nonwoven fabric produced in this example was used as the second raw fiber.
  • a machine called a defibrator which has a feed roll for supplying a piece of nonwoven fabric, a pre-cylinder around which a saw-shaped wire is wound, and a blower mechanism (not shown) was used.
  • the regenerated core-sheath type composite fiber it was observed that some of the fiber bonds remained.
  • the ratio of the 2nd raw material fiber was made into the value shown in Table 1 with respect to the whole raw material fiber. This second raw fiber is mixed with the first raw fiber in the raw cotton feeder 110.
  • a nonwoven fabric was produced using the apparatus 100 shown in FIG. However, as the card machine in the apparatus 100, the one shown in FIG. 4 was used. The operating conditions of each part in the apparatus 100 were as shown in Table 1.
  • the card machine shown in FIG. 4 is a parallel card machine, and the pre-cylinder 123 is provided with three sets of strippers and workers, and the main cylinder 127 is provided with six sets of strippers and workers.
  • One of the calendar rollers was made of iron and the other was made of paper. In this manner, a nonwoven fabric 10 having a basis weight of 25 g / m 2 having the pattern shown in FIG. 1 was obtained.
  • the main cylinder 127 has a diameter of 950 mm, and the pre-cylinder 123 has a diameter of 500 mm.
  • the peripheral speed of the main cylinder 127 was 1050 m / min.
  • the peripheral speed of the worker 125 arranged in the main cylinder 127 was as shown in Table 1.
  • the clearance between the three workers 151a-151c arranged in the pre-cylinder 123 and the pre-cylinder 123 is as shown in Table 1. did.
  • the clearance between the second worker 151b located immediately downstream of the first worker 151a and the pre-cylinder 123 was set to 0.5 mm.
  • the clearance between the third worker 151c located on the most downstream side and the pre-cylinder 123 was set to 0.3 mm.
  • the clearance between the three workers 125a-125f arranged in the main cylinder 127 and the main cylinder 127 is 0.5 mm (first worker 125a) and 0.5 mm (second worker 125b) from the upstream side to the downstream side.
  • Examples 2 to 11 and Comparative Examples 1 to 8 A nonwoven fabric was obtained in the same manner as in Example 1 except that the conditions shown in Table 1 were used.
  • Comparative Example 1 in which the web was embossed before air-through processing was harder than Comparative Example 2 in which the embossing was not performed.
  • a nonwoven fabric having a pattern that does not depend on printing or pigment kneading without impairing the good touch inherent to the air-through nonwoven fabric. Moreover, according to this invention, the nonwoven fabric which has such a pattern can be easily manufactured using the edge cut of the nonwoven fabric conventionally discarded.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Nonwoven Fabrics (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention porte sur un tissu non tissé (10), lequel tissu est fabriqué par un procédé de traversée d'air. Dans le tissu non tissé (10), de multiples masses de petites fibres (30) ayant une couleur plus profonde que celle du fond du tissu non tissé (10) sont dispersées et agencées dans un état disséminé sur la totalité du tissu non tissé (10). De plus, la différence d'épaisseur (T3) est de 1 mm ou moins, comme défini par la formule : T3 = T1 - T2 [où T1 est l'épaisseur du tissu non tissé (10) déterminée sous une pression de 7,64 kPa dans une position où une masse de petites fibres (30) est disposée, tandis que T2 est l'épaisseur de celui-ci déterminée sous une pression de 7,64 kPa dans une position où une masse de petites fibres (30) n'est pas disposée]
PCT/JP2012/082651 2011-12-26 2012-12-17 Tissu non tissé et son procédé de fabrication WO2013099674A1 (fr)

Priority Applications (2)

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CN201280056980.6A CN103946434B (zh) 2011-12-26 2012-12-17 无纺布及其制造方法
RU2014129846/12A RU2552908C1 (ru) 2011-12-26 2012-12-17 Нетканое полотно и способ его изготовления

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JP2011-283121 2011-12-26
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CN104562441B (zh) * 2015-01-12 2017-12-22 烟台万华循环纤维发展有限公司 一种再生纤维板的制造工艺
JP6404260B2 (ja) * 2016-05-13 2018-10-10 ユニ・チャーム株式会社 吸収性物品
JP6608860B2 (ja) * 2017-02-28 2019-11-20 ハビックス株式会社 フェイスマスク用不織布及びその製造方法
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JP6764450B2 (ja) * 2018-09-12 2020-09-30 ユニ・チャーム株式会社 吸収性物品の包装体
JP7050128B2 (ja) 2020-08-25 2022-04-07 花王株式会社 吸収性物品
CN113089187A (zh) * 2021-02-21 2021-07-09 金大付 一种医疗长纤维无纺布面料制备装置及方法
CN113201811A (zh) * 2021-04-23 2021-08-03 毛思林 一种非织造纤维低速高产杂乱梳理机

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CN103946434A (zh) 2014-07-23
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JP2013151774A (ja) 2013-08-08
RU2552908C1 (ru) 2015-06-10

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