WO2013054923A1 - 複合伸縮性材料およびその製造方法 - Google Patents
複合伸縮性材料およびその製造方法 Download PDFInfo
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- WO2013054923A1 WO2013054923A1 PCT/JP2012/076529 JP2012076529W WO2013054923A1 WO 2013054923 A1 WO2013054923 A1 WO 2013054923A1 JP 2012076529 W JP2012076529 W JP 2012076529W WO 2013054923 A1 WO2013054923 A1 WO 2013054923A1
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- Prior art keywords
- nonwoven fabric
- fabric sheet
- concave
- sheet portion
- convex
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 86
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- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 203
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- 238000007493 shaping process Methods 0.000 claims description 20
- 230000000052 comparative effect Effects 0.000 description 23
- 230000037303 wrinkles Effects 0.000 description 17
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- OCKGFTQIICXDQW-ZEQRLZLVSA-N 5-[(1r)-1-hydroxy-2-[4-[(2r)-2-hydroxy-2-(4-methyl-1-oxo-3h-2-benzofuran-5-yl)ethyl]piperazin-1-yl]ethyl]-4-methyl-3h-2-benzofuran-1-one Chemical compound C1=C2C(=O)OCC2=C(C)C([C@@H](O)CN2CCN(CC2)C[C@H](O)C2=CC=C3C(=O)OCC3=C2C)=C1 OCKGFTQIICXDQW-ZEQRLZLVSA-N 0.000 description 4
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
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- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Images
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Definitions
- the present invention relates to a composite stretchable material and a method for producing the same.
- a composite stretchable material having a stretchable portion composed of two sheet materials and a plurality of elastic members disposed between the two sheet materials, wherein the two sheet materials are stretchable in the stretchable portion. And the elastic member is arranged in the stretchable part so as not to pass through the joint part between both sheet materials and fixed to both sheet materials at both ends thereof.
- a composite stretchable material is known in which each of the both sheet materials forms a plurality of ridges extending continuously over a plurality of the elastic members (see Patent Document 1).
- Such a composite stretchable material has a gather that is soft to the touch and has a beautiful appearance (a stretchable part having a large number of wrinkles), and can form such a gather on an absorbent article or the like.
- an object of the present invention is to provide a composite stretchable material having a feature that the thickness at the time of contraction is thin and, as a result, it is in close contact with the wearer's body and feels good, and a method for producing the same.
- a composite stretchable material composed of a first nonwoven fabric sheet portion and a second nonwoven fabric sheet portion overlapping each other, and an elastic member disposed between the first nonwoven fabric sheet portion and the second nonwoven fabric sheet portion.
- Each of the nonwoven sheet portions is formed with a recess and a protrusion in the thickness direction of the nonwoven sheet portion
- the concave portions and the convex portions which are alternately and repeatedly formed in a first direction, extend along a second direction orthogonal to the first direction to define a concavo-convex row,
- the concavo-convex rows are separated from each other by a non-concave region extending without including the concave portion and the convex portion along the first direction;
- the convex part protrudes from the thickness direction position of the non-concave area of the corresponding nonwoven fabric sheet part,
- the concave portion formed between the two convex portions adjacent to each other reaches the position in the thickness direction of the non-concave region, While the non-concave regions of the first nonwoven fabric sheet portion and the second nonwoven fabric sheet portion face each other, the convex portion of the first nonwoven fabric sheet portion faces the second nonwoven fabric sheet portion and the The non-concave
- the elastic member is disposed in all the non-concave regions. This is because by arranging the elastic members in all the non-recessed regions, the shrinkage force applied to the composite stretchable material is made more uniform throughout, so that the wrinkles can be formed more uniformly.
- the first non-woven fabric sheet portion and the second non-woven fabric sheet portion that overlap each other are joined only in the non-concave region and not joined in the concave-convex row. This is because by restricting the joint portion between the nonwoven fabric sheets to the non-concave region, it is possible to prevent the formation of large wrinkles by forming the wrinkles that are shaped into the concave and convex rows.
- first nonwoven fabric sheet portion and the second nonwoven fabric sheet portion that overlap each other are formed in a single nonwoven fabric sheet, and the single nonwoven fabric sheet is bent parallel to the first direction. Preferably, they are folded along a line and overlap each other. This is because a composite stretchable material can be easily prepared from a single nonwoven fabric sheet.
- a composite stretchable material composed of a first nonwoven fabric sheet portion and a second nonwoven fabric sheet portion overlapping each other, and an elastic member disposed between the first nonwoven fabric sheet portion and the second nonwoven fabric sheet portion.
- a method of manufacturing In each of the nonwoven fabric sheet portions, a shaping step of forming concave and convex portions in the thickness direction of the nonwoven fabric sheet portion, The concave portions and the convex portions, which are alternately and repeatedly formed in a first direction, extend along a second direction orthogonal to the first direction to define a concavo-convex row, The concavo-convex rows are separated from each other by a non-concave region extending without including the concave portion and the convex portion along the first direction; The convex portion protrudes from the position in the thickness direction of the non-concave region of the corresponding nonwoven fabric sheet portion, and The concave portion formed between the two convex portions adjacent to each other reaches the position in the thickness direction of the non-concave region, The shaping stage; An elastic member disposing step of disposing the elastic material in a state of being stretched in the first direction on at least one non-concave region of one of the first nonwoven sheet portion and the second nonwoven
- a composite stretchable material composed of a first nonwoven fabric sheet portion and a second nonwoven fabric sheet portion overlapping each other, and an elastic member disposed between the first nonwoven fabric sheet portion and the second nonwoven fabric sheet portion.
- a method of manufacturing By passing between a continuous gear roll and a non-tooth gear roll that rotate in opposite directions while meshing with each other, a concave portion and a convex portion facing each other in the thickness direction of the nonwoven fabric sheet portion are formed in each of the nonwoven fabric sheet portions.
- the continuous gear roll has a plurality of continuous teeth spaced apart in the circumferential direction, and each continuous tooth is continuous in the width direction;
- the toothless gear roll has a plurality of discontinuous teeth spaced in the circumferential direction, and each discontinuous tooth is interrupted in the width direction by at least one missing tooth portion, and these missing tooth portions are arranged in the circumferential direction.
- the concave portions and the convex portions which are alternately and repeatedly formed in the first direction, define a concave-convex row; and
- the concavo-convex rows are separated from each other by a non-concave region extending without including the concave portion and the convex portion along the first direction,
- the shaping stage An elastic member disposing step of disposing the elastic material in a state of being stretched in the first direction on at least one non-concave region of one of the first nonwoven sheet portion and the second nonwoven sheet portion.
- the first nonwoven fabric sheet portion and the second nonwoven fabric sheet portion are overlapped, and the convex portion of the first nonwoven fabric sheet portion enters the concave portion of the second nonwoven fabric sheet portion, and the first A superposition step for allowing the convex portion of the second non-woven fabric sheet portion to enter the concave portion of the first non-woven fabric sheet portion;
- FIG. 7 which expanded the cross-section periphery of the elastic member. Peripheral direction of the peripheral gear roll and the continuous gear roll is developed in a straight line, and the peripheral portion around the meshed portion between the partial gear roll and the continuous gear roll and the non-woven sheet deformed between them is arranged.
- FIG. in the discontinuous tooth portion of the missing gear roll the peripheral portion of the missing gear roll and the continuous gear roll is linearly expanded, and the meshed portion of the missing gear roll and the continuous gear roll and the non-woven sheet disposed and deformed therebetween
- FIG. An example of the graph showing the measurement result of the surface shape of the composite elastic material of the comparative example 1.
- the composite stretchable material of the present invention is used for absorbent articles such as disposable diaper exterior sheets and three-dimensional gathers.
- the waistline stretchable portion and the waistline stretchable portion that contact the wearer's waist portion and its surrounding parts when worn using the composite stretchable material of the present invention for disposable diapers. Can be formed.
- stretch material of this invention can be used especially suitably for the site
- FIG. 1 shows an embodiment of an apparatus 10 for producing the composite stretchable material 3 of the present invention.
- the nonwoven fabric sheet 1 is wound around and held by a nonwoven fabric sheet feeding portion 11, and is then transferred to the preheating roll 13 by unwinding in the material transport direction (MD), that is, the first direction. .
- MD material transport direction
- the preheating roll 13 preheats the unwound nonwoven fabric sheet 1A so as to be easily deformed, and is set to 50 to 130 ° C. in this embodiment.
- the preheating temperature is determined according to the type of nonwoven fabric.
- the preheated nonwoven fabric sheet 1B is then transferred to the shaping device 15.
- the shaping device 15 includes a toothless gear roll 15A and a continuous gear roll 15B.
- the temperature is set to 50 to 130 ° C. so as to facilitate shaping as with the preheating roll 13.
- the preheated nonwoven fabric sheet 1B passes between the intermittent gear roll 15A and the continuous gear roll 15B that mesh with each other and rotate in opposite directions. Then, as will be described in detail later, the concave portion 51 and the convex portion 53 are formed by being deformed and stretched in a three-point bend shape and extending along a second direction orthogonal to the first direction. Accordingly, the concave portions 51 and the convex portions 53 that are alternately and repeatedly formed in the first direction define the concave / convex rows 41, and these concave / convex rows 41 are formed on the nonwoven fabric sheet 1 ⁇ / b> C across the non-concave regions 43.
- FIG. 2 shows a perspective view of the toothless gear roll 15A and the continuous gear roll 15B according to the present embodiment and a schematic view of the nonwoven fabric sheet 1C after shaping.
- the continuous gear roll 15 ⁇ / b> B has a plurality of continuous teeth 27 spaced in the circumferential direction, and each of these continuous teeth is continuous in the width direction.
- the toothless gear roll 15A has a plurality of discontinuous teeth 29 spaced in the circumferential direction, and each of the discontinuous teeth 29 is discontinuous in the width direction by at least one missing tooth portion 31. These missing tooth portions 31 are aligned in the circumferential direction.
- the concavo-convex rows 41 and the non-concave regions 43 are formed in the nonwoven fabric sheet 1C.
- FIG. 3 shows a front view of the toothless gear roll 15A and the continuous gear roll 15B.
- the width Wvc of the missing tooth portion 31c at the center of the missing tooth gear roll 15A is 2 mm
- the width Wvs of the missing tooth portion 31s other than the missing tooth portion at the center of the missing tooth gear roll 15A is 1 mm
- the width Wg of the continuous portion of the discontinuous teeth 29 is common and is 4 mm. The reason why the central missing tooth portion 31c is wider than the other missing tooth portion 31s is that the nonwoven fabric sheet 1 is folded at the stage of folding the nonwoven fabric sheet 1 described later.
- FIG. 4 shows a partial side view of the toothless gear roll 15A and the continuous gear roll 15B according to this embodiment.
- the height TH of the teeth 27 and 29 of the toothless gear roll 15A and the continuous gear roll 15B is about 1 mm, and the interval TP between the apexes of the adjacent teeth 27 and 29 is 1 mm.
- gear 27 and 29 has the flat part 35, and the length TL of the circumferential direction of the flat part 35 is about 0.1 mm.
- the thread-like elastic member 2 is wound and stored around the elastic member feeding portion 17, and is transferred to the adhesive application portion 19 by unwinding from there.
- the elastic member 2 is given a predetermined tension in advance, and the subsequent process is performed while the tension is maintained.
- the adhesive application unit 19 applies the adhesive to the elastic member 2 ⁇ / b> A transferred from the elastic member feeding unit 17.
- the adhesive application unit 19 performs continuous slit coating and places the elastic member 2A along a portion where hot melt is discharged from a slit nozzle (not shown), thereby providing hot around the elastic member 2A. Apply melt.
- FIG. 5 shows a composite stretched material 3A in the present embodiment, which is a combination of the nonwoven sheet 1C and the elastic material 2B at this stage, that is, a composite stretchable material 3A being manufactured.
- the composite stretchable material 3A in the state of FIG. 5 is transferred to the folding device 23.
- the folding device 23 is a wrapping sailor, and the wrapping sailor folds the composite stretchable material 3A with the central axis CL (see FIG. 5) as a fold line, and one side portion of the nonwoven fabric sheet 1C on the other side. On top of one side. Therefore, in the present embodiment, when the composite stretchable material 3A in the state of FIG. 5 passes through the folding device 23, the upper nonwoven fabric sheet portion 1U that is the right half of the nonwoven fabric sheet 1 in FIG. Folded. And it superimposes on the lower nonwoven fabric sheet part 1L which is the left half of the nonwoven fabric sheet 1 on FIG. As a result, the composite stretchable material 3A in the state of FIG. 5 becomes the composite stretchable material 3B in the state of FIG.
- the folding device 23 is folded along the central axis CL, but as long as the folding device 23 is along the folding line parallel to the concavo-convex row 41, the folding device 23 is folded around as needed. Also good.
- the composite elastic material 3 which concerns on this embodiment is manufactured by overlapping two nonwoven fabric sheet parts 1U and 1L in one nonwoven fabric sheet 1, two nonwoven fabric sheets are separately mentioned above. These nonwoven fabric sheets may be overlapped thereafter.
- the composite stretchable material 3B that has passed through the folding device 23 is transferred to the laminating press 25 and pressure is applied. Thereby, the nonwoven fabric sheet portions 1U and 1L are joined to each other through the elastic member 2B in the non-convex region 43, and the final composite stretchable material 3C is completed.
- the nonwoven fabric sheet 1 uses a spunbonded nonwoven fabric with a material weight of 17 g / m2.
- the present invention is not limited to this.
- a spunbond nonwoven fabric, a melt blown nonwoven fabric, a heat roll nonwoven fabric, an SMS nonwoven fabric combining a spunbond nonwoven fabric and a melt blown nonwoven fabric, an air-through nonwoven fabric, a spunlace nonwoven fabric, an airlaid nonwoven fabric, and the like can be used.
- a raw material of a nonwoven fabric sheet polyethylene, polypropylene, polyester, acrylic, or the like can be used as a raw material of a nonwoven fabric sheet.
- the elastic material 2 uses Lycra (registered trademark) 470DTEX.
- an elastic member such as urethane spandex can be used.
- the fineness it is preferable to use a plurality of elastic yarns of about 30 to 1500 Dtex and use elastic yarns having the same fineness or different finenesses. When it becomes 30 Dtex or less, the number of elastic yarns used per unit width increases and the production equipment becomes large. When it becomes 1500 Dtex or more, the interval between adjacent elastic yarns becomes large, and the upper and lower nonwoven fabric sheet portions 1U and 1L are meshed with each other.
- the elastic member synthetic rubber such as styrene-butadiene, butadiene, isoprene, or neoprene, natural rubber, EVA, SIS, SEBS, SEPS, stretchable polyolefin, polyurethane, or the like can be used.
- synthetic rubber such as styrene-butadiene, butadiene, isoprene, or neoprene, natural rubber, EVA, SIS, SEBS, SEPS, stretchable polyolefin, polyurethane, or the like can be used.
- FIG. 7 shows a partially enlarged perspective image view of the composite stretchable material 3 manufactured by the above method
- FIG. 8 shows a development view of FIG.
- the composite stretchable material 3 is composed of the upper nonwoven sheet portion 1U and the lower nonwoven sheet portion 1L in which the concavo-convex rows 41 are formed, and the elastic material 2 disposed between these nonwoven sheet portions. It is composed of In the upper nonwoven fabric sheet portion 1U and the lower nonwoven fabric sheet portion 1L, a plurality of linear concave and convex rows 41 that are substantially parallel to each other are formed across the non-concave regions 43 as described above.
- the concavo-convex row 41 includes concave portions 51 and convex portions 53 that are alternately and repeatedly formed.
- the convex portions 53L of the lower nonwoven fabric sheet portion 1L enter the concave portions 51U of the upper nonwoven fabric sheet portion 1U, and the convex portions of the upper nonwoven fabric sheet portion 1U. 53U has entered the recess 51L of the lower nonwoven fabric sheet portion 1L.
- FIG. 9 is a front view of FIG. 7 in which the periphery of the cross section of the elastic member 2 is enlarged.
- the non-concave regions 43U and 43L are joined to each other via the elastic member 2, and more strictly, applied by the adhesive application unit 19.
- the bonded portions 45 are formed by the bonded adhesive.
- the bonding portion 45 is distributed so as to cover the entire periphery of the elastic member 2.
- the non-recessed regions 43 ⁇ / b> U and 43 ⁇ / b> L may be bonded to each other, and the entire periphery of the elastic member 2 may be bonded. There is no need to cover.
- the thickness of the concavo-convex row 41 of the composite stretchable material 3 in the contracted state is thicker than the diameter or cross-sectional height of the elastic member 2, the touch when the composite stretchable material 3 is touched is improved. Therefore, it is preferable.
- the non-concave region 43 hardened by the adhesive applied around the elastic member 2 protrudes from the uneven column 41, and the non-protruded region 43 touches the wearer's body before the uneven column 41. This is because it prevents the user from feeling a foreign object.
- FIG. 10A and FIG. 10B show the non-tooth gear roll 15A and the continuous gear roll 15B in which the peripheral direction of the partial gear roll 15A and the continuous gear roll 15B is linearly developed, and the nonwoven fabric sheet 1 arranged and deformed between them.
- the enlarged cross-sectional image figure of a meshing part periphery is shown.
- FIG. 10A shows a sectional view of the missing tooth portion 31 of the missing gear roll 15A
- FIG. 10B shows a sectional view of the discontinuous tooth 29 portion of the missing gear roll 15A.
- the nonwoven fabric sheet 1 introduced into the missing tooth portion 31 of the missing gear roll 15 ⁇ / b> A has a radius of the continuous gear roll 15 ⁇ / b> B.
- a non-concave region 43 is formed without being deformed although pushed outward in the direction.
- the nonwoven fabric sheet 1 that is caught between the discontinuous teeth 29 of the toothless gear roll 15A and the continuous teeth 27 of the continuous gear roll 15B is locked to the tooth tip portion 33. It will be.
- the non-convex region 43 of the nonwoven fabric sheet 1 pressed by the continuous gear roll 15B at the toothless portion 31 of the missing gear roll 15A and the tooth tip portion 33B of the continuous gear roll 15B at the discontinuous tooth 29 portion of the missing gear roll 15A are locked.
- the position of the radial direction in each gear roll 15A, 15B with the bottom part of the recessed part 51 of the nonwoven fabric sheet 1 to become becomes substantially the same. That is, the thickness direction position in the nonwoven fabric sheet 1 becomes substantially the same. Therefore, even after the concavo-convex row 41 and the non-concave region 43 are formed on the nonwoven fabric sheet 1, they are present on substantially the same surface.
- the said surface is defined as the reference plane RP about each nonwoven fabric sheet part 1U and 1L.
- the reference plane RP is planar, and the non-concave area 43 extends on the reference plane RP.
- the convex portion 53 protrudes from the reference plane RP, that is, from the position in the thickness direction of the non-concave region 43.
- the convex portion 53 is separated from the reference surface RP of the upper nonwoven fabric sheet 1U and the lower nonwoven fabric sheet 1L by an amount protruding from the reference surface RP. Therefore, a fixed interval is left between the non-concave regions 43U and 43L facing each other between the upper nonwoven fabric sheet 1U and the lower nonwoven fabric sheet 1L. This is because one side of the shaping device 15 is a missing gear roll 15A and the other is a continuous gear roll 15B, so that the convex portion 53 protrudes in only one direction from the reference plane RP, and the side having the convex portion 53.
- the elastic member 2 can be disposed in a space defined at a constant interval between the non-concave regions 43U and 43L of the upper nonwoven fabric sheet 1U and the lower nonwoven fabric sheet 1L.
- the elastic member 2 by disposing the elastic member 2 between the nonwoven fabric sheet portions 1U and 1L, the operation of the convex portion 53 entering the concave portion 51 is not hindered.
- the nonwoven fabric sheet portions cannot be brought close to each other by the diameter of the elastic member 2 and hinder the function of the concave portion entering the convex portion. .
- the folding device 23 is used when folding the nonwoven fabric sheet 1C of the composite stretchable material 3A in the above process.
- tension is further applied to the nonwoven fabric sheet portion 1U in the first direction by the folding device 23.
- this tension is applied by a sailor edge (not shown) of the entraining sailor which is one specific embodiment of the folding device 23.
- the uneven pitch (length per one cycle in the first direction of the concave portion 51 and the convex portion 53) of the concave / convex row 41 of the upper nonwoven fabric sheet portion 1U is slightly smaller than the concave / convex pitch of the concave / convex row 41 of the lower nonwoven fabric sheet portion 1L.
- Will spread. After that, when the upper nonwoven fabric sheet portion 1U is overlapped with the lower nonwoven fabric sheet portion 1L, the tension is released and the tension applied before the introduction to the folding device 23 is applied. Will return. Next, the uneven pitch returns to the state before the composite stretchable material 3 ⁇ / b> A is introduced into the folding device 23.
- the two nonwoven sheets are separately shaped into the same shape without folding one nonwoven sheet, as described above. Even if they are overlapped, In this case, when the nonwoven fabric sheets are overlapped with each other, a tension higher than that of the other nonwoven fabric sheet is applied to the one nonwoven fabric sheet in the first direction. Thereby, the same structure as the case where one nonwoven fabric sheet is folded can be taken.
- the convex portions 53U and 53L of the nonwoven fabric sheet portions 1U and 1L enter the concave portions 51L and 51U of the nonwoven fabric sheet portions 1L and 1U.
- Example 1 The composite stretchable material 3 of Example 1 is the composite stretchable material 3 manufactured by the manufacturing method according to the embodiment of the present invention.
- the elastic member laminating magnification is stretched to 3 in the non-concave region 43 between the nonwoven fabric sheet portions 1U and 1L shaped by the shaping device 15.
- the elastic members 2 to which the adhesive is applied are arranged at intervals of 5 mm. That is, the non-woven fabric sheet portions 1U and 1L folded in the direction in which the convex portions 53U and 53L face each other are joined in the non-concave region 43.
- Comparative Example 1 The composite stretchable material of Comparative Example 1 is stretched so that the elastic member laminating magnification is 3 between the two nonwoven fabric sheet portions not subjected to the shaping process as described above, as in Example 1. And elastic members to which an adhesive is applied are arranged at intervals of 5 mm. Thereby, the laminated nonwoven fabric sheet parts are joined.
- Comparative Example 2 The composite stretchable material of Comparative Example 2 is stretched so that the elastic member bonding magnification is 3 in the non-concave region 43 between the nonwoven fabric sheet portions 1U and 1L shaped by the shaping device 15.
- elastic members to which an adhesive is applied are arranged at intervals of 5 mm.
- the reference planes RP of the nonwoven fabric sheet portions 1U and 1L are substantially at the same position. Will be placed.
- the convex portions 53U and 53L of the nonwoven fabric sheet portions 1U and 1L are different from the first embodiment in that they do not enter the concave portions 51L and 51U of the nonwoven fabric sheet portions 1L and 1U.
- each measurement item and the measurement method are as follows. In addition, these are measured in the state when the composite stretchable material is in a contracted state. This is because, in a situation where such a composite stretchable material is used, the composite stretchable material is in a contracted state or a state close to the contracted state.
- the surface shape of the specimen is measured in a direction parallel to the concavo-convex row 41 using a laser shape measurement system (KS-1100, manufactured by KEYENCE), and the height of each ridge is measured.
- KS-1100 laser shape measurement system
- the heel refers to a portion that protrudes on one side beyond the average height of the surface shape
- the height of the ridge is the height of the highest point among the measurement points contained in one ridge. Say it.
- the measurement conditions of the surface shape are a measurement range of 30 mm, a measurement pitch of 5 ⁇ m, and a moving average of 12 points before and after in the analysis stage after measurement.
- An example of the measurement results of Comparative Example 1, Comparative Example 2, and Example 1 are shown in FIGS. 11A, 11B, and 11C, respectively.
- Average thickness The average thickness is obtained by measuring the thickness of the composite stretchable material five times when a test piece is sandwiched between measuring devices and a pressure of 3 gf / cm 2 is applied, and averaged.
- ⁇ pitch A wrinkle pitch means the length of the nonwoven fabric sheet which divided the length (30 mm) of the measurement range by the number of wrinkles detected by measurement.
- Example 1 is clearly lower in the average height of the crease when compared with Comparative Example 1 and Comparative Example 2, and Example 1 is also apparent in the average thickness of the composite stretchable material. thin. Therefore, it can be said that the composite stretchable material of Example 1 is thinner than those of Comparative Examples 1 and 2, and as a result, it is in close contact with the wearer's body and feels good. Moreover, about the standard deviation of the height of the wrinkles, Example 1 is sufficiently lower than Comparative Examples 1 and 2, and the uniform wrinkles as the composite stretchable material of Example 1 formed in the uneven rows It can be understood that it is formed. From the above, it can be said that the composite stretchable material of Example 1 has a good feel and is also excellent in aesthetics. These can also be understood by looking at the graphs of FIGS. 11A-11C.
- the standard deviation of the height of the ridge is preferably 0.3 or less. This is because it can be said that it is sufficiently good in touch and excellent in aesthetics.
- the wrinkle pitch of Example 1 is shorter than that of Comparative Example 1, and the wrinkle density of Example 1 is higher than that of Comparative Example 1. From now on, it can be understood that the composite stretchable material of Example 1 forms finer wrinkles, and as a result, the total thickness of the composite stretchable material is reduced.
- the wrinkle density is preferably 15 pieces / cm to 25 pieces / cm.
- FIG. 12 is a graph showing the thicknesses of the composite stretchable materials of Example 1A and Comparative Example 2A, measured by changing the elastic material elastic laminating magnification. Note that the composite stretchable materials of Example 1A and Comparative Example 2A were prepared by changing only the elastic member laminating magnification of the composite stretchable materials of Example 1 and Comparative Example 2 described above.
- Example 1A when the elastic member laminating magnification is about 2, the thickness in the contracted state hardly changes between Example 1A and Comparative Example 2A. However, it can be understood that when the elastic member laminating magnification is increased, Example 1A is thinner than Comparative Example 2A. The difference is significant when the elastic member bonding magnification is about 3. Thus, it can be understood that the composite stretchable material of the present invention is not easily thickened in the contracted state even if the stretchability is increased by increasing the elastic member laminating magnification. This is because, in Example 1A, the concave portions 51 and the convex portions 53 are inserted into each other, so that the large wrinkles are not formed by forming the wrinkles as formed in the concave and convex rows. Therefore, it can be understood from this result that the effect can be exhibited even if the stretchability is increased.
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Abstract
Description
互いに重なり合う第一の不織布シート部分及び第二の不織布シート部分と、前記第一の不織布シート部分と前記第二の不織布シート部分との間に配置された弾性部材とから構成される複合伸縮性材料であって、
前記不織布シート部分の各々には、その不織布シート部分の厚さ方向に凹部及び凸部が形成され、
第一の方向に交互に繰り返し形成された前記凹部及び前記凸部が、前記第一の方向に直交する第二の方向に沿って各々延びて、凹凸列を画定し、
前記凹凸列が、前記第一の方向に沿って前記凹部及び前記凸部を含むことなく延びる非凹凸領域によって互いに隔てられており、
前記凸部が、対応する前記不織布シート部分の前記非凹凸領域の厚さ方向位置から突出しており、
互いに隣接する2つの前記凸部同士の間に形成される前記凹部が、前記非凹凸領域の厚さ方向位置まで到っており、
前記第一の不織布シート部分と前記第二の不織布シート部分との前記非凹凸領域が互いに対向しつつ、前記第一の不織布シート部分の前記凸部が前記第二の不織布シート部分を向くと共に前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分を向くように重ね合わせられると共に、前記第一の方向に伸張した状態の前記弾性部材が、互いに整列する前記非凹凸領域同士の間に配置され、
互いに整列された前記非凹凸領域同士が弾性部材を介して接合され、
前記第一の不織布シート部分の前記凸部が前記第二の不織布シート部分の前記凹部内部に入り込むと共に、前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分の前記凹部内部に入り込んでいる、
複合伸縮性材料が提供される。
互いに重なり合う第一の不織布シート部分及び第二の不織布シート部分と、前記第一の不織布シート部分と前記第二の不織布シート部分との間に配置された弾性部材とから構成される複合伸縮性材料を製造する方法であって、
前記不織布シート部分の各々に、その不織布シート部分の厚さ方向に凹部及び凸部を形成する賦形段階であって、
第一の方向に交互に繰り返し形成された前記凹部及び前記凸部が、前記第一の方向に直交する第二の方向に沿って各々延びて、凹凸列を画定し、
前記凹凸列が、前記第一の方向に沿って前記凹部及び前記凸部を含むことなく延びる非凹凸領域によって互いに隔てられており、
前記凸部が、対応する前記不織布シート部分の前記非凹凸領域の厚さ方向位置から突出しており、かつ、
互いに隣接する2つの前記凸部同士の間に形成される前記凹部が、前記非凹凸領域の厚さ方向位置まで到っている、
賦形段階と、
前記第一の方向に伸張した状態の前記弾性材料を前記第一の不織布シート部分又は前記第二の不織布シート部分のうちの一方の少なくとも1つの前記非凹凸領域の上に配置する弾性部材配置段階と、
前記第一の不織布シート部分と前記第二の不織布シート部分との前記非凹凸領域が互いに対向しつつ、前記第一の不織布シート部分の前記凸部が前記第二の不織布シート部分を向くと共に前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分を向くように、前記第一の不織布シート部分と前記第二の不織布シート部分とを重ね合わせて、前記第一の不織布シート部分の凸部が前記第二の不織布シート部分の凹部内部に入り込むと共に、前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分の前記凹部内部に入り込むようにする重ね合わせ段階と、
互いに整列された前記非凹凸領域同士を、前記弾性部材を介して互いに接合する接合段階と、
を含む、
複合伸縮性材料を製造する方法が提供される。
互いに重なり合う第一の不織布シート部分及び第二の不織布シート部分と、前記第一の不織布シート部分と前記第二の不織布シート部分との間に配置された弾性部材とから構成される複合伸縮性材料を製造する方法であって、
互いに噛み合いながら互いに逆方向に回転する、連続ギヤロールと欠歯ギヤロールとの間を通過させることによって、前記不織布シート部分の各々に、その不織布シート部分の厚さ方向を向く凹部及び凸部を形成する賦形段階であって、
前記連続ギヤロールは周方向に離間された複数の連続歯を有し、各前記連続歯は幅方向に連続しており、
前記欠歯ギヤロールは周方向に離間された複数の不連続歯を有し、各前記不連続歯は少なくとも1つの欠歯部分によって幅方向に中断されており、これらの欠歯部分は周方向に整列されており、
第一の方向に交互に繰り返し形成された前記凹部及び前記凸部が、凹凸列を画定し、かつ、
前記凹凸列が、前記第一の方向に沿って前記凹部及び前記凸部を含むことなく延びる非凹凸領域によって互いに隔てられている、
賦形段階と、
前記第一の方向に伸張した状態の前記弾性材料を前記第一の不織布シート部分又は前記第二の不織布シート部分のうちの一方の少なくとも1つの前記非凹凸領域の上に配置する弾性部材配置段階と、
前記第一の不織布シート部分と前記第二の不織布シート部分との前記非凹凸領域が互いに対向するように、かつ前記賦形段階において前記連続ギヤロール側に位置する方の面同士が対面するように、前記第一の不織布シート部分と前記第二の不織布シート部分とを重ね合わせて、前記第一の不織布シート部分の凸部が、前記第二の不織布シート部分の凹部内部に入り込むと共に、前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分の前記凹部内部に入り込むようにする重ね合わせ段階と、
互いに整列された前記非凹凸領域同士を、前記弾性部材を介して互いに接合する接合段階と、
を含む、
複合伸縮性材料を製造する方法が提供される。
(実施例1)
実施例1の複合伸縮性材料3は、本発明の実施形態に係る製造方法によって製造した複合伸縮性材料3である。実施例1の複合伸縮性材料3では、賦形装置15によって賦形された不織布シート部分1U,1L同士の間の非凹凸領域43に、弾性部材貼り合わせ倍率が3になるように伸長されていると共に接着剤が塗布されている弾性部材2が、5mm間隔で配置されている。すなわち、凸部53U,53L同士が向き合う方向に折り重ねられた不織布シート部分1U,1L同士が、非凹凸領域43で接合されている。
(比較例1)
比較例1の複合伸縮性材料では、上述のような賦形処理をされていない2つの不織布シート部分同士の間に、実施例1と同様に弾性部材貼り合わせ倍率が3になるように伸長されていると共に接着剤が塗布されている弾性部材が5mm間隔で配置されている。それにより、重ね合わされた不織布シート部分同士が接合されている。
(比較例2)
比較例2の複合伸縮性材料は、賦形装置15によって賦形された不織布シート部分1U,1L同士の間の非凹凸領域43に、弾性部材貼り合わせ倍率が3になるように伸長されていると共に接着剤が塗布されている弾性部材が、5mm間隔で配置されている。そして、凸部53U,53Lが互いに逆方向を向く方向に、つまり完成形の複合伸縮性材料の外側を向くように折り重ねられた不織布シート部分1U,1L同士が非凹凸領域43で接合されている。比較例2の複合伸縮性材料では、凸部53U,53Lが互いに逆方向を向く方向に不織布シート部分1L,1U同士を重ね合わせるので、不織布シート部分1U,1Lの基準面RP同士がほぼ同じ位置に配置されることになる。その結果、不織布シート部分1U,1Lの凸部53U,53Lが、不織布シート部分1L,1Uの凹部51L,51U内部に入り込まないという点で、実施例1と異なる。
(皺の高さ)
レーザ形状測定システム(KEYENCE製 KS-1100)を用いて試験体の表面形状を凹凸列41と平行な方向に測定して、各皺の高さを測定する。ここで、皺とは表面形状の平均高さを超えて一方の面側に突出している部分のことをいい、皺の高さとは1つの皺に含まれる測定点の中で最も高い箇所の高さのことをいう。表面形状の測定条件は、測定範囲が30mmであり、測定ピッチが5μmであり、測定後の解析段階で前後12点の移動平均を取っている。比較例1、比較例2及び実施例1のこの測定結果の一例を図11A、図11B及び図11Cにそれぞれ示す。
(平均厚さ)
平均厚さとは、試験体を測定装置で挟み、3gf/cm2の圧力を印加したときの複合伸縮性材料の厚さを5回測定して、平均したものである。
(皺ピッチ)
皺ピッチとは、測定範囲の長さ(30mm)を測定で検知された皺の個数で割った不織布シートの長さをいう。
(皺密度)
皺密度とは凹凸列と平行な方向の1cmあたりの皺の個数をいう。
1U 上側不織布シート部分
1L 下側不織布シート部分
2 弾性部材
3 複合伸縮性材料
15 賦形装置
15A 欠歯ギヤロール
15B 連続ギヤロール
23 折り重ね装置
27 連続歯
29 不連続歯
31 欠歯部分
41 凹凸列
43 非凹凸領域
51 凹部
53 凸部
Claims (6)
- 互いに重なり合う第一の不織布シート部分及び第二の不織布シート部分と、前記第一の不織布シート部分と前記第二の不織布シート部分との間に配置された弾性部材とから構成される複合伸縮性材料であって、
前記不織布シート部分の各々には、その不織布シート部分の厚さ方向に凹部及び凸部が形成され、
第一の方向に交互に繰り返し形成された前記凹部及び前記凸部が、前記第一の方向に直交する第二の方向に沿って各々延びて、凹凸列を画定し、
前記凹凸列が、前記第一の方向に沿って前記凹部及び前記凸部を含むことなく延びる非凹凸領域によって互いに隔てられており、
前記凸部が、対応する前記不織布シート部分の前記非凹凸領域の厚さ方向位置から突出しており、
互いに隣接する2つの前記凸部同士の間に形成される前記凹部が、前記非凹凸領域の厚さ方向位置まで到っており、
前記第一の不織布シート部分と前記第二の不織布シート部分との前記非凹凸領域が互いに対向しつつ、前記第一の不織布シート部分の前記凸部が前記第二の不織布シート部分を向くと共に前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分を向くように重ね合わせられると共に、前記第一の方向に伸張した状態の前記弾性部材が、互いに整列する前記非凹凸領域同士の間に配置され、
互いに整列された前記非凹凸領域同士が弾性部材を介して接合され、
前記第一の不織布シート部分の前記凸部が前記第二の不織布シート部分の前記凹部内部に入り込むと共に、前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分の前記凹部内部に入り込んでいる、
複合伸縮性材料。 - 全ての前記非凹凸領域に前記弾性部材が配置されている、
請求項1に記載の複合伸縮性材料。 - 互いに重なり合う前記第一の不織布シート部分及び前記第二の不織布シート部分が、前記非凹凸領域でのみ接合されており、前記凹凸列では接合されていない、
請求項1又は2に記載の複合伸縮性材料。 - 互いに重なり合う前記第一の不織布シート部分及び前記第二の不織布シート部分が、単一の不織布シート内に形成されており、
前記単一の不織布シートが、前記第一の方向に平行な折り曲げ線に沿って折り曲げられ、互いに重ね合わされている、
請求項1~3のいずれか1項に記載の複合伸縮性材料。 - 互いに重なり合う第一の不織布シート部分及び第二の不織布シート部分と、前記第一の不織布シート部分と前記第二の不織布シート部分との間に配置された弾性部材とから構成される複合伸縮性材料を製造する方法であって、
前記不織布シート部分の各々に、その不織布シート部分の厚さ方向に凹部及び凸部を形成する賦形段階であって、
第一の方向に交互に繰り返し形成された前記凹部及び前記凸部が、前記第一の方向に直交する第二の方向に沿って各々延びて、凹凸列を画定し、
前記凹凸列が、前記第一の方向に沿って前記凹部及び前記凸部を含むことなく延びる非凹凸領域によって互いに隔てられており、
前記凸部が、対応する前記不織布シート部分の前記非凹凸領域の厚さ方向位置から突出しており、かつ、
互いに隣接する2つの前記凸部同士の間に形成される前記凹部が、前記非凹凸領域の厚さ方向位置まで到っている、
賦形段階と、
前記第一の方向に伸張した状態の前記弾性材料を前記第一の不織布シート部分又は前記第二の不織布シート部分のうちの一方の少なくとも1つの前記非凹凸領域の上に配置する弾性部材配置段階と、
前記第一の不織布シート部分と前記第二の不織布シート部分との前記非凹凸領域が互いに対向しつつ、前記第一の不織布シート部分の前記凸部が前記第二の不織布シート部分を向くと共に前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分を向くように、前記第一の不織布シート部分と前記第二の不織布シート部分とを重ね合わせて、前記第一の不織布シート部分の凸部が前記第二の不織布シート部分の凹部内部に入り込むと共に、前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分の前記凹部内部に入り込むようにする重ね合わせ段階と、
互いに整列された前記非凹凸領域同士を、前記弾性部材を介して互いに接合する接合段階と、
を含む、
前記複合伸縮性材料を製造する方法。 - 互いに重なり合う第一の不織布シート部分及び第二の不織布シート部分と、前記第一の不織布シート部分と前記第二の不織布シート部分との間に配置された弾性部材とから構成される複合伸縮性材料を製造する方法であって、
互いに噛み合いながら互いに逆方向に回転する、連続ギヤロールと欠歯ギヤロールとの間を通過させることによって、前記不織布シート部分の各々に、その不織布シート部分の厚さ方向を向く凹部及び凸部を形成する賦形段階であって、
前記連続ギヤロールは周方向に離間された複数の連続歯を有し、各前記連続歯は幅方向に連続しており、
前記欠歯ギヤロールは周方向に離間された複数の不連続歯を有し、各前記不連続歯は少なくとも1つの欠歯部分によって幅方向に中断されており、これらの欠歯部分は周方向に整列されており、
第一の方向に交互に繰り返し形成された前記凹部及び前記凸部が、凹凸列を画定し、かつ、
前記凹凸列が、前記第一の方向に沿って前記凹部及び前記凸部を含むことなく延びる非凹凸領域によって互いに隔てられている、
賦形段階と、
前記第一の方向に伸張した状態の前記弾性材料を前記第一の不織布シート部分又は前記第二の不織布シート部分のうちの一方の少なくとも1つの前記非凹凸領域の上に配置する弾性部材配置段階と、
前記第一の不織布シート部分と前記第二の不織布シート部分との前記非凹凸領域が互いに対向するように、かつ前記賦形段階において前記連続ギヤロール側に位置する方の面同士が対面するように、前記第一の不織布シート部分と前記第二の不織布シート部分とを重ね合わせて、前記第一の不織布シート部分の凸部が、前記第二の不織布シート部分の凹部内部に入り込むと共に、前記第二の不織布シート部分の前記凸部が前記第一の不織布シート部分の前記凹部内部に入り込むようにする重ね合わせ段階と、
互いに整列された前記非凹凸領域同士を、前記弾性部材を介して互いに接合する接合段階と、
を含む、
前記複合伸縮性材料を製造する方法。
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WO2014196669A3 (ja) * | 2013-09-30 | 2015-01-15 | ユニ・チャーム株式会社 | 使い捨てオムツ |
JP2015066369A (ja) * | 2013-09-30 | 2015-04-13 | ユニ・チャーム株式会社 | 使い捨てオムツ |
CN106163476A (zh) * | 2014-05-02 | 2016-11-23 | 尤妮佳股份有限公司 | 一次性尿布及制造一次性尿布的方法 |
EP3138546A4 (en) * | 2014-05-02 | 2017-04-19 | Unicharm Corporation | Disposable diaper and method for manufacturing disposable diaper |
AU2015254383B2 (en) * | 2014-05-02 | 2018-11-22 | Unicharm Corporation | Disposable diaper and method for manufacturing disposable diaper |
Also Published As
Publication number | Publication date |
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BR112014008462A2 (pt) | 2017-04-25 |
EP2767267B1 (en) | 2016-09-21 |
JP5709720B2 (ja) | 2015-04-30 |
CN103874474A (zh) | 2014-06-18 |
EP2767267A4 (en) | 2015-05-27 |
CN103874474B (zh) | 2015-09-16 |
EP2767267A1 (en) | 2014-08-20 |
JP2013081715A (ja) | 2013-05-09 |
US9597855B2 (en) | 2017-03-21 |
US20140302286A1 (en) | 2014-10-09 |
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