JP2019188758A - Elastic laminate sheet, tab member, and sanitation material - Google Patents

Abstract

To enhance peel strength between a stretchable film and an unwoven fabric while maintaining moderate stretchability.SOLUTION: The elastic laminate sheet has a stretchable film, an unwoven fabric laminated on at least one surface of the stretchable film, and a crimp line depressed by crimping the unwoven fabric and the stretchable film, the crimp line extends in one direction which obliquely intersects with a contraction direction of the stretchable film, a plurality of crimp lines are arranged in line in a crosswise direction orthogonal to one direction and inclination angle of the direction to the contraction direction is 15° to 75°.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stretchable laminated sheet, a tab member, or a sanitary material provided with a tab member.

  An elastic laminate sheet in which a nonwoven fabric is laminated on an elastomer layer is known (see Patent Document 1 and Patent Document 2). For example, in paragraph “0011” of Patent Document 1, “the stretchable laminated sheet 1 is composed of a low stretchable laminate sheet A1 and a high stretchable laminate sheet A2 constituting the laminate, and the low stretchable laminate sheet A1 and the high stretchable laminate sheet A1. The elastic laminate sheets A2 are alternately arranged in one direction. " The paragraph “0012” includes “the low stretch laminate sheet A1 and the high stretch laminate sheet A2, the first joining regions 5a and 6a in which the elastomer layer 3 and the nonwoven fabric 2 are joined, and the first The second bonding regions 5b and 6b in which the elastomer layer 3 and the nonwoven fabric 2 are bonded to each other are weaker than the bonding regions 5a and 6a. In addition, in the paragraph “0037”, “the longitudinal direction of the strip-shaped first bonding region 6a intersects MD, and the longest axis among the symmetry axes of the strip-shaped first bonding region 6a; The angle formed by the arrangement direction (MD) of the high stretch laminate sheet A2 and the low stretch laminate sheet A1 is preferably more than 0 ° and not more than 90 °, and more preferably not less than 10 ° and not more than 90 °. Is described.

Japanese Patent No. 5600275 Japanese Patent No. 523001

  For example, when a sanitary material, such as an open-type disposable diaper, is worn on the object to be worn, the tab portion of the sanitary material is pulled and fixed while adjusting the tightening force. When the above stretchable laminated sheet is applied to the tab portion, if stretchability is prioritized, the peel strength between the elastomer layer and the nonwoven fabric tends to decrease, making it difficult to improve both.

  The stretchable laminated sheet according to one aspect of the present invention includes a stretchable film, a nonwoven fabric laminated on at least one surface of the stretchable film, and a crimping line that is depressed by crimping the nonwoven fabric and the stretchable film. The crimping line extends in one direction obliquely intersecting the stretching direction of the stretchable film, and a plurality of crimping lines are provided side by side in the lateral direction perpendicular to the one direction, and the one direction with respect to the stretching direction The inclination angle is 15 ° or more and 75 ° or less.

  When the region where the nonwoven fabric and the stretchable film are bonded is enlarged, the peel strength is improved, but the stretchability of the stretchable film may be lowered. The stretchable laminated sheet includes a crimping line extending in one direction, and one direction that is the extending direction of the crimping line is tilted with respect to the stretchable direction. Is 15 ° or more and 75 ° or less. Therefore, it is difficult to impair the stretchability as compared with the aspect in which the crimping line is along the stretch direction. As a result, it is advantageous for improving the peel strength between the stretchable film and the nonwoven fabric while maintaining appropriate stretchability.

  The tab member according to one aspect of the present invention includes an elastic laminate sheet having a nonwoven fabric laminated on at least one surface of the elastic film and the elastic film, and one of a pair of engaging portions forming a mechanical fastener. And an engagement portion fixed to the stretchable laminated sheet, and the stretchable region of the stretchable laminated sheet includes a crimped line that is depressed by crimping the nonwoven fabric and the stretchable film, and the crimping line is a stretchable film. Extending in one direction obliquely intersecting the expansion / contraction direction, and a plurality of crimping lines are provided side by side in a lateral direction orthogonal to the one direction, and an inclination angle in one direction with respect to the expansion / contraction direction is 15 ° or more, and It is 75 degrees or less, and the engaging portion is provided at one end of the both ends in the expansion / contraction direction of the stretchable laminated sheet.

  A sanitary material according to one aspect of the present invention includes a tab portion including one engaging portion and a main body portion including the other engaging portion among a pair of engaging portions forming a mechanical fastener. The tab portion is composed of a stretchable laminated sheet having a nonwoven fabric laminated on at least one surface of the stretchable film and the stretchable film, and one engaging portion fixed to the stretchable laminated sheet. The stretchable region of the stretchable laminated sheet is provided with a crimp line that is depressed by crimping the nonwoven fabric and the stretchable film, and the crimp line extends in one direction that obliquely intersects the stretch direction of the stretchable film. There are a plurality of crimping lines arranged in a horizontal direction orthogonal to one direction, the inclination angle in one direction with respect to the expansion / contraction direction is 15 ° or more and 75 ° or less, and the engaging portion is an elastic laminate. One of the two ends of the sheet It is provided at the end.

  According to one aspect of the present invention, it is advantageous for improving the peel strength between the stretchable film and the nonwoven fabric while maintaining appropriate stretchability.

FIG. 1 is a perspective view of the stretchable laminated sheet according to the first embodiment. FIG. 2 is an enlarged plan view showing a region indicated by an arrow A in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. FIG. 4 is an enlarged plan view showing a modification of the stretchable laminated sheet according to the first embodiment. FIG. 5 is a diagram schematically showing a production process of the stretchable laminated sheet. FIG. 6 is a plan view of the tab member shown with a part broken away. FIG. 7: is a perspective view which shows the state before fixing with the tab part which shows the disposable diaper which is an example of a sanitary material. FIG. 8: is a perspective view which shows the state after showing the disposable diaper which is an example of a sanitary material, and fixing with the tab part. FIG. 9 is an enlarged plan view of the stretchable laminated sheet according to the second embodiment. FIG. 10 is an enlarged plan view of the stretchable laminated sheet according to the third embodiment. FIG. 11 is an enlarged plan view of the stretchable laminated sheet according to the fourth embodiment. (A) of FIG. 12 is a front view which shows an example of the elastic film fixed with the sealing material in order to perform 100% expansion | extension. (B) is a front view showing an example of a stretchable film in which a stretchable film once stretched is fixed again with a sheet material in order to perform the second 100% stretch. (A) of FIG. 13 is sectional drawing of the state which fixed the elastic film, (b) is sectional drawing of the state expanded 100%, (c) is sectional drawing of the state returned to the original. 14A is a cross-sectional view in a state in which an elastic film once stretched is fixed, FIG. 14B is a cross-sectional view in a state in which 100% is stretched, and FIG. 14C is a cross-section in a state in which the stretched film is restored to 50%. FIG. FIG. 15 is a perspective view showing an example of a jig for expanding and contracting the stretchable laminated sheet before measuring the peel strength. FIG. 16A is a front view showing an example of a method for measuring the peel strength of the stretchable laminated sheet, and FIG. 16B is a cross-sectional view of the front view taken along line bb.

  The stretchable laminated sheet according to one aspect of the embodiment includes a stretchable film, a nonwoven fabric laminated on at least one surface of the stretchable film, and a crimp line that is depressed by crimping the nonwoven fabric and the stretchable film. The crimping line extends in one direction obliquely intersecting the stretching direction of the stretchable film, and a plurality of crimping lines are provided side by side in the lateral direction perpendicular to the one direction, and the one direction with respect to the stretching direction The inclination angle is 15 ° or more and 75 ° or less.

  When the region where the nonwoven fabric and the stretchable film are bonded is enlarged, the peel strength is improved, but the stretchability of the stretchable film may be lowered. The stretchable laminated sheet includes a crimping line extending in one direction, and one direction that is the extending direction of the crimping line is tilted with respect to the stretchable direction. Is 15 ° or more and 75 ° or less. Therefore, the stretchability is unlikely to be reduced as compared with the aspect in which the crimping line is along the stretch direction. As a result, it is advantageous for improving the peel strength between the stretchable film and the nonwoven fabric while maintaining appropriate stretchability.

  In the stretchable laminated sheet, the crimping line is formed by arranging a plurality of crimped portions in which the nonwoven fabric and the stretchable film are crimped and recessed, aligned in the one direction, and the crimping portion is one in the lateral direction. Long form in the direction. Providing a single crimping line divided into a plurality of crimping parts is advantageous for improving stretchability.

  In the above stretchable laminated sheet, a plurality of auxiliary crimping portions that are recessed by crimping the nonwoven fabric and the stretchable film are provided between the plurality of crimping lines. It can be made into a form smaller than the width | variety of the expansion-contraction direction. The width of the auxiliary crimping part in the direction of expansion and contraction is smaller than the width of the crimping line in the direction of expansion and contraction, so there is little decrease in stretchability. To be advantageous.

  In at least a part of the non-crimped part where the nonwoven fabric and the stretchable film of the stretchable laminated sheet are not crimped, the nonwoven fabric can be embedded in the stretchable film. Since the nonwoven fabric is embedded in the stretchable film not only in the crimping line but also in the non-crimped portion, it is advantageous in improving the peel strength between the stretchable film and the nonwoven fabric.

  In the stretchable laminated sheet described above, the plurality of crimping portions of one of the adjacent crimping lines among the plurality of crimping lines are arranged in the horizontal direction with respect to the plurality of crimping portions of the other crimping line. Can be.

  In the stretchable laminated sheet described above, the plurality of crimping portions of one of the adjacent crimping lines among the plurality of crimping lines are arranged offset from the lateral direction with respect to the plurality of crimping portions of the other crimping line. Can be.

  In the stretchable laminated sheet, the stretchable film from which the nonwoven fabric was peeled off was stretched by 75% at a speed of 300 mm / min under the conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5%. The load at the time of returning to the initial position before stretching at a speed of / min and then performing 50% stretching at a speed of 300 mm / min can be set to 2.5 N / 25 mm or less. This load is advantageous in maintaining stretchability when applied to a tab portion of a sanitary material such as an adult diaper.

  Said load in said elastic laminated sheet can be made into the form which is less than 1.6 N / 25mm. This load is advantageous in maintaining stretchability when applied to a tab portion of a sanitary material such as a baby diaper.

  In the above stretchable laminated sheet, the stretchable film and the nonwoven fabric are peeled at a peel rate of 500 mm / min along the peel direction opposite to each other under the conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5%. The integrated average of the plurality of adhesive strengths obtained during the peeling test is 3.5 N / 15 mm or more. This form is advantageous for improving the peel strength.

  The tab member according to one aspect of the embodiment includes one of a stretchable laminated sheet having a nonwoven fabric laminated on at least one surface of the stretchable film and the stretchable film, and a pair of engaging portions forming a mechanical fastener. And an engagement portion fixed to the stretchable laminated sheet, and the stretchable region of the stretchable laminated sheet includes a crimped line that is depressed by crimping the nonwoven fabric and the stretchable film, and the crimping line is a stretchable film. Extending in one direction obliquely intersecting the expansion / contraction direction, and a plurality of crimping lines are provided side by side in a lateral direction orthogonal to the one direction, and an inclination angle in one direction with respect to the expansion / contraction direction is 15 ° or more, and It is 75 degrees or less, and the engaging portion is provided at one end of the both ends in the expansion / contraction direction of the stretchable laminated sheet.

  This tab member is advantageous in improving the peel strength between the stretchable film and the nonwoven fabric while maintaining appropriate stretchability.

  In the tab member described above, the stretchable laminated sheet further includes a stretch restriction region in at least one of the two regions sandwiching the stretch region in the stretch direction, and the stretch restriction region is depressed by a non-woven fabric and a stretch film being pressed. It is possible to provide one or a plurality of regulation crimping portions, and the length of the regulation crimping portion in the expansion / contraction direction can be longer than the lateral width of the crimping line. Since the stretchability is suppressed in the regulated crimp portion, for example, it is suitable as a portion where an engaging portion is provided or fixed to another member.

  The sanitary material according to one aspect of the embodiment includes a tab portion including one engaging portion and a main body portion including the other engaging portion among the pair of engaging portions forming the mechanical fastener. The tab portion is composed of a stretchable laminated sheet having a nonwoven fabric laminated on at least one surface of the stretchable film and the stretchable film, and one engaging portion fixed to the stretchable laminated sheet. The stretchable region of the stretchable laminated sheet is provided with a crimp line that is depressed by crimping the nonwoven fabric and the stretchable film, and the crimp line extends in one direction that obliquely intersects the stretch direction of the stretchable film. There are a plurality of crimping lines arranged in a horizontal direction orthogonal to one direction, the inclination angle in one direction with respect to the expansion / contraction direction is 15 ° or more and 75 ° or less, and the engaging portion is an elastic laminate. Of the both ends of the sheet expansion and contraction direction, One end is provided at the end.

  The tab portion of this sanitary material is advantageous in improving the peel strength between the stretchable film and the nonwoven fabric while maintaining appropriate stretchability.

  Of the terms used in the above forms, the term “film” is meant to include a wide range of sheet-like and belt-like (tape-like) forms. “Pressurized and depressed” means a state in which the portion is fixed in a partially compressed state and is thinner than a non-compressed non-compressed portion. The crimping line is at least both of an aspect in which a plurality of crimping parts are arranged in a line and a single line is formed, and an aspect in which a single line is formed by a single crimping part extending in a line shape. included. The “stretching direction of the stretchable film” means a direction in which the stretchability is substantially the highest. The “inclination angle in one direction with respect to the expansion / contraction direction” means the smaller angle of the intersection angles between the direction that obliquely intersects the expansion / contraction direction and the expansion / contraction direction.

  Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  The stretchable laminated sheet according to the embodiment can be suitably used for applications that require excellent stretching, for example, diaper applications, and applications that require aesthetic appearance, and applications that require excellent contact properties (such as touch). Also, it can be suitably used.

  As shown in FIGS. 1, 2, and 3, the stretchable laminated sheet 1 </ b> A according to the first embodiment is a sheet material in which nonwoven fabrics 3 and 4 are laminated on both sides of a stretchable film 2. The direction in which the stretchable film 2 is sent out in a state of being laminated on the nonwoven fabrics 3 and 4 is MD (Machine Direction), and the direction orthogonal to the MD is CD (Cross Machine Direction). In this embodiment, the stretchability of the CD is higher than the stretchability of the MD, and the CD is in the stretch direction D1. Moreover, although this embodiment demonstrates to the example the aspect by which the nonwoven fabrics 3 and 4 were laminated | stacked on both surfaces of the elastic film 2, the aspect by which the nonwoven fabric 3 was laminated | stacked only on one side may be sufficient.

  The stretchable laminated sheet 1A includes a stretchable area AR1 and a stretch regulation area AR2. The expansion / contraction restriction area AR2 means an area having lower elasticity than the expansion / contraction area AR1. The stretchable area AR1 and the stretch regulation area AR2 are provided with crimped portions 5 and 6 that are depressed by the nonwoven fabric 3 and the stretchable film 2 being crimped. The crimping parts 5 and 6 are formed by embossing using a nip roll having a predetermined uneven pattern on the surface. Basically, the larger the area occupied by the crimping parts 5 and 6, the lower the stretchability, and the form of the crimping parts 5 and 6 makes it possible to distinguish between the stretchable area AR1 and the stretchable regulation area AR2. In the expansion / contraction restriction area AR2, the concave / convex pattern of the crimping part 6 is not particularly provided, and the entire area may be crimped. Moreover, in this embodiment, although the crimping | compression-bonding parts 5 and 6 (refer FIG. 6) are formed in one nonwoven fabric 3 side among the nonwoven fabrics 3 and 4 laminated | stacked on both surfaces of the elastic film 2, it is the same on both surfaces The crimp parts 5 and 6 may be provided. Hereinafter, description will be made centering on the stretchable area AR1.

  The stretchable film 2 and the nonwoven fabrics 3 and 4 are uniformly bonded (fixed) over the entire surface, but are particularly firmly bonded at the crimping portion 5. More specifically, the nonwoven fabrics 3 and 4 are embedded in the stretchable film 2 at a part of the laminated surfaces 3a and 4a that are in contact with the stretchable film 2, and a portion other than the crimping portion 5 (non-crimping portion) 7 Compared to the above, the crimping part 5 is buried deeper. In addition, the meaning that the nonwoven fabrics 3 and 4 are embed | buried in the stretchable film 2 means that at least one part of the nonwoven fabrics 3 and 4 directly penetrates into the stretchable film 2 and is integrated without using an adhesive or the like. Means state.

  A plurality of crimping parts 5 are provided in the stretchable area AR1. The plurality of crimping portions 5 are arranged in one direction D2 obliquely intersecting with the expansion / contraction direction D1, and the crimping line 8 is formed by the plurality of crimping portions 5 arranged in this one direction D2. That is, the one direction D2 in which the plurality of crimping parts 5 are arranged is the extending direction of the crimping line 8. The one direction D2 is provided to be inclined with respect to the stretch direction D1 of the stretchable film 2.

  In the crimping part 5, the length La in one direction D2 is longer than the width Wa in the horizontal direction D3 orthogonal to the one direction D2. That is, it is sufficient for the crimping part 5 to be able to specify a long shape that is long in one direction D2, and may be, for example, an ellipse, a rectangle, or other shapes.

  The length La in the longitudinal direction of the crimping part 5 can be set to 0.3 mm to 4.0 mm, can be set to 0.5 mm to 3.0 mm, and can be set to 0.7 mm to 2.0 mm. . Further, the width Wa in the lateral direction D3 orthogonal to the longitudinal direction of the crimping part 5 can be set to 0.1 mm to 3.0 mm, can be set to 0.2 mm to 2.0 mm, and can be set to 0.3 mm to 1 mm. 0.0 mm. Moreover, the depth da recessed as the crimping | compression-bonding part 5 can be 0.1 mm-5.0 mm, can be 0.2 mm-2.0 mm, and shall be 0.3 mm-1.0 mm. Can do. The depth da depressed as the crimping part 5 means the distance between the surface 7a of the non-crimped part 7 that is not crimped and the bottom 5a of the crimping part 5. Further, the thickness db of the stretchable laminated sheet 1A can be set to 0.3 mm to 6.0 mm, can be set to 0.5 mm to 4.0 mm, and can be set to 1.0 mm to 3.0 mm.

  Here, “one direction D2 that obliquely intersects with the expansion / contraction direction D1” means that the direction is not the direction along the expansion / contraction direction D1 and is not the direction along the direction orthogonal to the expansion / contraction direction D1. More specifically, the inclination angle θ in one direction D2 that obliquely intersects the expansion / contraction direction D1 is 15 ° or more, may be 22.5 ° or more, and may be 45 ° or more. Further, the inclination angle θ is 75 ° or less, 67.5 ° or less, or 45 ° or less. Further, the inclination angle θ is 15 ° to 75 °, preferably 22.5 ° to 67.5 °, and more preferably 40 ° to 50 °.

  The stretchable laminated sheet 1A includes a plurality of crimping lines 8 extending in one direction D2. Specifically, the plurality of crimping lines 8 are provided so as to be arranged in parallel in the lateral direction D3 orthogonal to the one direction D2.

  When specifying the crimping line 8, for example, any one crimping part 5 can be determined as a reference. Specifically, the longitudinal direction of the reference crimping part 5 is specified, and a straight line passing through the reference crimping part 5 along the longitudinal direction is assumed. Next, if the longitudinal direction of the crimping part 5 on the straight line is substantially aligned with the straight line, it can be confirmed that the crimping line 8 is formed by the plurality of crimping parts 5 arranged on the straight line. . In addition, the longitudinal direction of the crimping | compression-bonding part 5 is substantially meaning with respect to this straight line, for example, the meaning which accept | permits the case where it has about several degrees inclination to the right and left with respect to a straight line.

  Next, two adjacent crimping lines 8 are compared. In the present embodiment, the plurality of crimping parts 5 forming the other crimping line 8 are arranged in the horizontal direction D3 with respect to the plurality of crimping parts 5 forming one crimping line 8. On the other hand, for example, as shown in FIG. 4, the plurality of crimping parts 5 </ b> X forming the other crimping line 8 are shifted from the lateral direction D <b> 3 with respect to the plurality of crimping parts 5 </ b> X forming one crimping line 8. It may be a modified example of arrangement (staggered arrangement).

  The stretchable film 2 may be made of a resin material containing an elastomer. The type of elastomer is not particularly limited. For example, styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene / butylene-styrene block copolymer (SEBS), polyurethane, ethylene copolymer (For example, ethylene vinyl acetate, ethylene-propylene copolymer, ethylene-propylene-diene terpolymer), propylene oxide (PO) and the like. In view of convenience in the manufacturing process, a multilayer structure having a skin of polyolefin or the like on at least one surface of the elastomer core may be used.

  The resin material constituting the stretchable film 2 may contain components other than those described above. For example, the resin material may be a stiffening agent (eg, polyvinyl styrene, polystyrene, poly α-methyl styrene, polyester, epoxy resin, polyolefin, coumarone-indene resin), viscosity reducing agent, plasticizer, tackifier (eg, Aliphatic hydrocarbon tackifiers, aromatic hydrocarbon tackifiers, terpene resin tackifiers, hydrogenated terpene resin tackifiers), dyes, pigments, antioxidants, antistatic agents, adhesives, antitacking agents , Slip agent, heat stabilizer, light stabilizer, foaming agent, glass bubble, starch, metal salt, microfiber and the like.

  Nonwoven fabrics 3 and 4 can be widely used as materials that can be processed into fibers, and can be adjusted to desired softness by appropriately combining materials, adjusting the fiber length, fiber thickness, and the like. The material of the nonwoven fabrics 3 and 4 may be, for example, polypropylene fiber, a mixed fiber obtained by blending polyester fiber and polyolefin fiber, a polyethylene terephthalate core material, and a concentric composite fiber in which the core material is covered with polyethylene. The manufacturing method of the nonwoven fabrics 3 and 4 may be, for example, a spunbond method, a spunlace method, or a thermal bond method.

  Next, a method for producing the stretchable laminated sheet 1A will be described. The stretchable laminated sheet 1A can be advantageously produced by a simultaneous melt extrusion lamination method. In the process according to an example of the simultaneous melt extrusion laminating method, a laminate process (see FIG. 5) in which the nonwoven fabrics 3 and 4 are laminated on the stretchable film 2 to produce the stretchable laminated sheet 1A, and the stretchable laminated sheet 1A is stretched. An Activate process to be performed and a Slitting process for forming a slit for conveyance in the stretchable laminated sheet 1A are executed.

  As shown in FIG. 5, in the Laminate process, for example, a stretchable laminated sheet 1 </ b> A is manufactured using a simultaneous melt extrusion laminating apparatus (manufacturing apparatus) 100. The manufacturing apparatus 100 includes a nip roll 101 that forms the press-bonding portions 5 and 6 having a predetermined pattern, and a cooling roll 102 that is disposed to face the nip roll 101. The manufacturing apparatus 100 is connected to an extruder (not shown), and a die (usually a T die) 103 that supplies the stretchable film 2 between the nip roll 101 and the cooling roll 102, and both sides of the stretchable film 2. And a non-woven fabric supply roll (not shown) for supplying a pair of non-woven fabrics 3 and 4 to be laminated.

  The stretchable film 2 is fed out from the T die 103 in the form of a melt flow, and is guided between the first nonwoven fabric 3 and the second nonwoven fabric 4 between the nip roll 101 and the cooling roll 102, where it is cooled. And solidified. The cooling roll 102 can be formed from a calendar roll having a substantially smooth surface.

  The nip roll 101 has convex portions that form the crimping portions 5 and 6 on the surface thereof. The height of the convex portion can be appropriately provided according to the desired depth of the crimping portion 5. By sandwiching the stretchable laminated sheet 1A between the nip roll 101 and the cooling roll 102, the crimping parts 5 and 6 and the non-crimping part 7 are formed on one nonwoven fabric 3 side of the stretchable laminated sheet 1A. . In the crimping part 5, the nonwoven fabrics 3 and 4 are denser than the non-crimping part 7, and the nonwoven fabrics 3 and 4 are firmly bonded to the stretchable film 2. Moreover, in the non-crimp part 7, although the adhesive strength of the nonwoven fabrics 3 and 4 and the stretchable film 2 is lower than the crimp part 5, it is adhere | attached uniformly with fixed adhesive strength.

  The stretchable laminated sheet 1A discharged from the nip roll 101 and the cooling roll 102 is transported to the take-up roll by various transport rolls 104 and is held by the take-up roll.

  After the Laminate process, the Activate process is executed, and then the Slitting process is executed. In the Activate process, in order to relax the initial strength of the nonwoven fabric and reduce the stress, the stretchable laminated sheet 1A is subjected to a certain stretching process in the CD direction (stretching direction D1). By performing the Activate process after the Laminate process, the nonwoven fabrics 3 and 4 laminated on the stretchable film 2 are deformed, resulting in a reduction in the stress of the stretchable laminated sheet 1A as a whole. In the present embodiment, the slitting process is performed after the slitting process. In the Slitting process, although it depends on the shape and size of the stretchable laminated sheet 1A, the wide stretchable laminated sheet 1A is usually subjected to a cutting process so as to have a desired CD direction (stretching direction D1). Apply.

  Next, with reference to FIG. 6, the tab member 10 used for the open-type disposable diaper 20 (refer FIG. 7, FIG. 8) is demonstrated. When the diaper 20 is worn on a wearing target (such as an infant or an elderly person), the diaper 20 is provided with a tab portion 21 that is pulled so as to be wound around the waist of the wearing target. The member forming the tab portion 21 is the tab member 10.

  The tab member 10 includes the above-described stretchable laminated sheet 1A processed into a predetermined shape and an engaging portion 11A. The stretchable laminated sheet 1A includes a stretchable area AR1 and a stretch regulation area AR2. The stretchable area AR1 includes a crimping line 8 extending in one direction D2 that obliquely intersects the stretchable direction D1 of the stretchable film 2. The crimping line 8 is formed by a plurality of crimping portions 5 arranged in one direction D2. The inclination angle θ in one direction D2 with respect to the expansion / contraction direction D1 is 15 ° or more and 75 ° or less. A plurality of crimping lines 8 are provided side by side in the lateral direction D3 orthogonal to the one direction D2. The crimping | compression-bonding part 5 is a shape longer in one direction D2 than the horizontal direction D3.

  The expansion / contraction restriction area AR2 only needs to be provided in at least one of the two areas sandwiching the expansion / contraction area AR1 in the expansion / contraction direction D1, and is provided in both in this embodiment. The expansion / contraction regulation area AR2 includes a plurality of crimping parts (regulation crimping parts) 6 in which the nonwoven fabrics 3 and 4 and the stretchable film 2 are crimped and recessed. The length Lb in the expansion / contraction direction D1 of the restriction crimping portion 6 is longer than the width Wa in the lateral direction D3 of the crimping line 8 in the expansion / contraction region AR1. The regulation crimping part 6 according to the present embodiment is, for example, rectangular, and is regularly arranged in a direction (MD) orthogonal to the expansion / contraction direction D1. The wider the regulation pressure-bonding portion 6, the resistance at the time of expansion and contraction, and the effect of regulating the stretchability becomes greater.

  The engaging portion 11 </ b> A is one of a pair of engaging portions 11 </ b> A and 11 </ b> B that form the mechanical fastener 22. The mechanical fastener 22 is meant to include a structure called a hook-and-loop fastener or a hook and loop fastener, for example, and means a fastener that can be attached and removed in a plane. The mechanical fastener 22 includes a pair of planar engaging portions 11A and 11B that are in contact with each other, and raised portions 11a that are physically engaged with each other are provided on the contact surfaces of the pair of engaging portions 11A and 11B. Yes. As the raised portions 11a that are engaged with each other, in addition to the relationship between the hooks and the loops, both are hooks, both the hook and the loop are provided on each contact surface, or a mushroom-like raised portion or the like. May be.

  11 A of engaging parts are being fixed so that it may overlap with one expansion-contraction restriction area AR2 among the two expansion-contraction restriction areas AR2 of the tab member 10. When the engaging portion 11A is pulled and attached to another engaging portion 11A, the engaging portion 11A is provided in the expansion / contraction restriction area AR2 of the tab member 10, so that the displacement due to expansion / contraction is small and stable attachment is possible. become.

  Next, with reference to FIG.7 and FIG.8, the open type disposable diaper 20 is demonstrated. The disposable diaper 20 according to the present embodiment is an example of a sanitary material. The disposable diaper 20 includes a rectangular laminate 25 that includes an outer liquid impermeable polymer film 23 and an inner liquid absorbing layer 24. The laminate 25 is provided with a tab portion 21 formed by the tab member 10 described above.

  The tab portion 21 is provided with one of a pair of engaging portions 11A forming the mechanical fastener 22, and the laminate (main body portion) 25 is provided with the other engaging portion 11B. The other engaging portion 11B is provided, for example, on the front surface of a region that covers the lower abdomen of the wear target. When the diaper 20 is worn on a wearing subject, the left and right tab portions 21 are pulled so that the polymer film 23 is wound around the waist of the wearing subject. The left and right tab portions 21 are pulled with an appropriate expansion and contraction force, and finally, the engaging portion 11A of the tab portion 21 is attached to the engaging portion 11B of the laminate 25 and fixed.

  The tab portion 21 is provided with expansion / contraction restriction areas AR2 at two positions sandwiching the expansion / contraction area AR1, the engaging portion 11A is fixed to one expansion / contraction restriction area AR2, and the other expansion / contraction restriction area AR2 is the polymer film 23. It is fixed to. Accordingly, when the diaper 20 is worn on the object to be worn by pulling the tab portion 21, the tab portion 21 is not easily displaced and has high shape stability, so that it can be easily adjusted to an appropriate stretching force when worn. Further, when the engaging portion 11A of the tab portion 21 is attached to another engaging portion 11B, the displacement due to expansion and contraction at the engaging portion 11A is small, and stable attachment is possible.

  Next, effects of the stretchable laminated sheet 1A, the tab member 10, and the disposable diaper 20 (an example of a sanitary material) according to the present embodiment will be described.

  Assuming a stretchable laminated sheet having a region where a nonwoven fabric and a stretchable film are pressure-bonded, if the pressure-bonded region is enlarged, the peel strength is improved, but the stretchability of the stretchable film may be reduced. There is.

  Here, the stretchable laminated sheet 1A according to the present embodiment includes the crimping line 8 extending in one direction D2, and the one direction D2 that is the extending direction of the crimping line 8 is in the stretching direction D1. In particular, the inclination angle θ is 15 ° or more and 75 ° or less. Accordingly, the stretchability is unlikely to be lowered as compared with the aspect in which the crimp line 8 is along the stretch direction D1. As a result, it is advantageous for improving the peel strength between the stretchable film 2 and the nonwoven fabrics 3 and 4 while maintaining appropriate stretchability. In particular, the tab member 10 is manufactured using the stretchable laminated sheet 1A according to the present embodiment, and the tab member 10 is used to manufacture the diaper 20 so that a caregiver, a parent, or the like can wear the diaper 20 on the object to be worn. When being worn, the tab portion 21 can be stopped at a predetermined position by pulling the tab portion 21 equally easily on the left and right. As a result, leakage due to the displacement of the diaper 20 can be effectively suppressed.

  Furthermore, the crimping line 8 according to the present embodiment is formed by a plurality of crimping portions 5. That is, one crimping line 8 is provided so as to be divided into a plurality of crimping parts 5, which is advantageous for improving stretchability. Furthermore, in terms of appearance and feel, it is more advantageous to form a single crimping line 8 with a plurality of crimping portions 5 than to form a single crimping line continuously. . Specifically, in the form in which the crimping portions are continuously formed to form a single crimping line, the concave and convex shapes are easily noticeable because the concave portions are connected in a line shape. However, by dividing into a plurality of crimping portions 5, the crimping portions 5 are scattered even on one crimping line 8. As a result, the unevenness becomes inconspicuous, and the touch becomes easy to come close to a normal nonwoven fabric without the crimping part 5.

  Furthermore, in this embodiment, since the nonwoven fabrics 3 and 4 are embedded in the stretchable film 2 not only in the crimping line 8 but also in the non-crimped portion 7, the peel strength between the stretchable film 2 and the nonwoven fabric 3 is improved. Become advantageous.

  The stretchable laminated sheet 1A is a laminate in which the nonwoven fabric 3 is laminated on the stretchable film 2, and in addition to the above-described excellent stretchability, it is excellent in touch and appearance, and directly touches the skin. It is suitable for use and can be widely used.

  Moreover, in the manufacturing method of the stretchable laminated sheet 1A according to the present embodiment, the nonwoven fabrics 3 and 4 are deformed by performing the Activate process after the Laminate process, and as a result, the stress reduction of the stretchable laminated sheet 1A is achieved. It contributes to. Furthermore, since the elastic laminate sheet 1A is provided with the crimping line 8 extending in one direction D2 against this low stress, it is advantageous for maintaining and improving the peel strength.

  Moreover, since the tab member 10 according to the present embodiment has the configuration of the stretchable laminated sheet 1A described above, it is possible to improve the peel strength between the stretchable film 2 and the nonwoven fabric 3 while maintaining appropriate stretchability. It is advantageous.

  Moreover, in the case of the diaper 20 which concerns on this embodiment, since the elastic laminated sheet 1A is used in the tab part 21, the peeling strength of the elastic film 2 and the nonwoven fabric 3 is maintained, maintaining moderate elasticity. It is advantageous for improvement. Specifically, the diaper 20 is easy to wear and can be worn quickly, and after the wear, the stretchable laminated sheet 1A is flexible and should be worn comfortably from infants to the elderly and sick. Can do. In the diaper 20, the attachment / detachment at the engaging portion 11 </ b> A may be repeated, but the stretchable laminated sheet 1 </ b> A has a high peel strength and thus is resistant to repeated attachment / detachment.

  Next, another embodiment of the stretchable laminated sheet 1A applicable to the diaper 20 (an example of a sanitary material) will be described with reference to FIG. 9, FIG. 10, or FIG.

  As shown in FIG. 9, the stretchable laminated sheet 1 </ b> B according to the second embodiment further includes an auxiliary pressure-bonding portion 51 with respect to the stretchable laminated sheet 1 </ b> A according to the first embodiment. Specifically, in the stretchable laminated sheet 1B, a plurality of crimping lines 8 are formed by a plurality of crimping portions 5 arranged in one direction D2, and a plurality of the crimping lines 8 are arranged in the lateral direction D3. Further, auxiliary crimping portions 51 are provided between the adjacent crimping lines 8 so as to align with the respective crimping portions 5 in the lateral direction D3. The auxiliary crimping part 51 is depressed by the non-woven fabric 3 and the stretchable film 2 being crimped, and is formed by a nip roll like the crimping part 5. The auxiliary crimping part 51 is provided in an auxiliary manner in order to increase the peel strength between the nonwoven fabric 3 and the stretchable film 2 and needs to be formed within a range that does not impair the stretchability. Therefore, at least the width Wb of the auxiliary crimping portion 51 in the expansion / contraction direction D1 needs to be smaller than the width of the crimping portion 5 in the expansion / contraction direction D1 (width in the expansion / contraction direction of the crimping line) Wc. The width Wd in one direction D2 of the auxiliary crimping portion 51 is smaller than the length La in one direction D2 of the crimping portion 5, and the area of the auxiliary crimping portion 51 is, for example, half or less, desirably 1/3 or less, Desirably, it is 1/5 or less.

  As shown in FIG. 10, the stretchable laminated sheet 1 </ b> C according to the third embodiment further connects a plurality of crimping parts 5 in one direction D <b> 2 with respect to the stretchable laminated sheet 1 </ b> B according to the second embodiment. A connecting portion 52 is provided. Specifically, in the stretchable laminated sheet 1 </ b> C, a crimping line 8 is formed by a plurality of crimping parts 5 arranged in one direction D <b> 2 and a connecting part 52 that couples the plurality of crimping parts 5. In both the crimping part 5 and the connecting part 52, the nonwoven fabric 3 and the stretchable film 2 are crimped and recessed. The crimping part 5 has a width Wa in the lateral direction D3 wider than the connecting part 52.

  As shown in FIG. 11, in the stretchable laminated sheet 1D according to the fourth embodiment, a crimping line 8 is formed by one crimping portion 5A extending along one direction D2, and this crimping line 8 are arranged in a row in the horizontal direction D3 orthogonal to the one direction D2. The width Wf of the crimping line 8 in the lateral direction D3 is substantially constant in one direction D2.

  The stretchable laminated sheets 1B, 1C, and 1D according to the second to third embodiments include a crimping line 8 that extends in one direction D2, and the one direction D2 that is the extending direction of the crimping line 8 is Inclined with respect to the expansion / contraction direction D1, in particular, the inclination angle θ is not less than 15 ° and not more than 75 °. Accordingly, the stretchability is unlikely to be lowered as compared with the aspect in which the crimp line 8 is along the stretch direction D1. As a result, it is advantageous for improving the peel strength between the stretchable film 2 and the nonwoven fabric 3 while maintaining appropriate stretchability.

  Furthermore, the stretchable laminated sheets 1B and 1C according to the second and third embodiments are provided with an auxiliary pressure bonding part 51, which is advantageous in improving the peel strength. In addition, the stretchable laminated sheets 1C and 1D according to the third and fourth embodiments are formed by the crimping portions 5 and 5A in which the crimping line 8 is continuous, which is advantageous in improving the peel strength. In addition, in the stretchable laminated sheet 5D according to the fourth embodiment, it is possible to adopt a form in which the auxiliary crimping portion 51 is provided.

  Further, in the stretchable laminated sheets 1A to 1D according to the above embodiments, for example, the form and dimensions of the crimping line 8 are defined so that the value (load) for evaluating stretchability is the following value. You can also. Specifically, the stretchable film from which the nonwoven fabric was peeled off under the conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5% was stretched by 75% at a speed of 300 mm / min, and then 300 mm / min. The load when returning to the initial position before stretching at a speed and then stretching 50% at a speed of 300 mm / min can be made to be 2.5 N / 25 mm or less. By prescribing such a load, for example, it is advantageous for maintaining stretchability when applied to a tab portion of a sanitary material such as an adult diaper.

  Moreover, this load can be made into the form which is 1.6 N / 25mm or less. By prescribing such a load, for example, it is advantageous in maintaining stretchability when applied to a tab portion of a sanitary material such as a baby diaper. This load can be 0.5 N / 25 mm or more.

  Moreover, in the stretchable laminated sheets 1A to 1D according to the above-described embodiments, for example, the form and dimensions of the crimping line 8 can be defined so that the value for evaluating the peel strength is the following value. Specifically, a peel test in which the stretchable film and the nonwoven fabric are peeled at a peel rate of 500 mm / min along the peel direction, which is the opposite direction, under conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5%. I do. And it is advantageous to the improvement of peeling strength by calculating | requiring the integral average of several adhesive strength obtained in the middle of peeling, and setting this value to be 3.5 N / 15mm or more.

  Further, the arrangement of the plurality of crimping portions 5 forming the crimping line 8 does not need to be strictly aligned in one direction D2 (completely coaxial), and may have some variation. For example, even if the plurality of crimping parts 5 are shifted in the horizontal direction D3 and are arranged in a zigzag manner, it is only necessary to identify the one direction D2 as a tendency. Specifically, if the lateral displacement width of the crimping part 5 is about the width Wa in the lateral direction D3 of the crimping part 5, the one direction D2 can be easily specified.

  In addition, the arrangement of the plurality of crimping lines 8 arranged in the horizontal direction D3 is not limited to the arrangement in which the adjacent crimping lines or the auxiliary crimping parts 51 are sandwiched so as to sandwich the auxiliary crimping part 51 and the like. .

  Further, the plurality of crimping lines 8 arranged in the lateral direction D3 are not limited to the same mode, and for example, the above-described embodiments or other modes can be appropriately combined. Such a crimp line 8 may be arranged arbitrarily or repeatedly so as to be repeated at a constant period. For example, regarding the arrangement of the plurality of crimping lines 8, the crimping part 5 of the first crimping line 8 is elliptical, the crimping part 5 of the second crimping line 8 adjacent to the first crimping line 8 is rectangular, The crimping part 5 of the third crimping line 8 adjacent to the second crimping line 8 has a rhombus shape, and the pattern of the first to third crimping lines 8 is arranged in the horizontal direction D3 so as to repeat as one cycle. May be. Further, for example, while the shape of each crimping part 5 forming the first crimping line 8 and the second crimping line 8 is common (ellipse or the like), the spacing between the crimping parts 5 arranged in one direction D2 is different, or the crimping part 5 may be different in size.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these examples. In addition, about the elastic film, each Example and the comparative example used the common elastic film. Specifically, an elastic film having a basis weight of 45 gsm manufactured using a SIS copolymer (manufactured by Nippon Zeon Co., Ltd., trade name “Quitac 3390” 50%, “Quitac 3620” 50%) was used. Moreover, in Examples 1-4 described later and Comparative Examples 1 and 2, a spunbonded nonwoven fabric (basis weight 32 gsm) of PET 90% and PP 10% was used as the nonwoven fabric material.

[Example 1]
Using a simultaneous melt extrusion laminating apparatus as shown in FIG. 5, the lamination conditions are as follows: elastomer melting temperature in the extruder: 240 ° C., nip pressure: 0.1 Mpa, bottom surface of the nip roll recess, and cooling roll surface. A stretchable laminated sheet in which a nonwoven fabric was laminated on both sides of the stretchable film was prepared at a distance of 3 mm. The elastomer was put into a single screw extruder and discharged from a T die so that the basis weight of the resulting stretchable film was 45 g / m ² . Next, immediately before the melt stretchable film enters a gap between the cooling roll and the nip roll, a separately prepared non-woven fabric was inserted from both the nip roll side and the cooling roll side. A stretchable laminated sheet having a three-layer structure in which a nonwoven fabric is laminated on both sides of a stretchable film by contacting a meltable stretchable film and a nonwoven fabric between a cooling roll and a nip roll and solidifying the melt stretchable film. Obtained. The resulting elastic laminate sheet was taken up by a take-up roll.

  The stretchable laminated sheet according to Example 1 was provided with a crimping line (see FIG. 2) having a pattern corresponding to the first embodiment. The longitudinal dimension of the plurality of crimping portions forming the crimping line was 0.7 to 2 mm. The inclination angle of the crimping line with respect to the expansion / contraction direction, that is, the inclination angle in one direction in which the crimping line extends was 45 °. Moreover, the occupation ratio of the crimping | compression-bonding part in a predetermined area | region was 9%.

[Example 2]
A stretchable laminated sheet according to Example 2 was produced in the same manner as in Example 1 except that the crimping pattern was different. The stretchable laminated sheet according to Example 2 was provided with a crimping line having a pattern (see FIG. 9) corresponding to the second embodiment. The longitudinal dimension of the plurality of crimping portions forming the crimping line was 0.7 to 2 mm. The tilt angle in one direction with respect to the expansion / contraction direction was 45 °. The auxiliary pressure bonding part was substantially circular and the inner diameter was 0.3 mm. Further, the occupation ratio of the crimping part and the auxiliary crimping part in the predetermined region was 13%.

[Example 3]
A stretchable laminated sheet according to Example 3 was produced in the same manner as in Example 1 except that the crimping pattern was different. The stretchable laminated sheet according to Example 3 was provided with a crimping line having a pattern (see FIG. 10) corresponding to the third embodiment. The inclination angle in one direction with respect to the expansion / contraction direction was 45 °. The longitudinal dimension of the plurality of crimping portions forming the crimping line was 0.7 to 2 mm. The width in the lateral direction of the connecting portion that connects the plurality of crimping portions was 0.2 mm. Moreover, the auxiliary | assistant crimping | compression-bonding part was substantially circular and the internal diameter was 0.3 mm. Moreover, the occupation ratio of the crimping | compression-bonding part in a predetermined area | region, a connection part, and an auxiliary | assistant crimping | compression-bonding part was 17%.

[Example 4]
A stretchable laminated sheet according to Example 4 was produced in the same manner as in Example 1 except that the crimping pattern was different. The stretchable laminated sheet according to Example 4 was provided with a crimping line (see FIG. 11) having a pattern corresponding to the fourth embodiment. The inclination angle in one direction with respect to the expansion / contraction direction was 45 °. The lateral width of the crimping part forming the crimping line was 0.7 mm. Moreover, the auxiliary | assistant crimping | compression-bonding part was substantially circular and the internal diameter was 0.3 mm. Moreover, the occupation ratio of the crimping | compression-bonding part in a predetermined area | region was 7%.

[Comparative Example 1]
A stretchable laminated sheet according to Comparative Example 1 was produced in the same manner as in Example 1 except that the crimping pattern was different. The stretchable laminated sheet according to Comparative Example 1 did not include a crimping part that forms a crimping line, and instead, substantially circular crimping parts were evenly arranged. The inner diameter of the crimping part was 0.3 mm, and the occupation ratio of the crimping part in the predetermined area was 4%.

[Comparative Example 2]
A stretchable laminated sheet according to Comparative Example 2 was produced in the same manner as Comparative Example 1 except that the crimping pattern was different. The stretchable laminated sheet according to Comparative Example 2 did not include a crimping part that forms a crimping line, and instead, substantially circular crimping parts were evenly arranged. The inner diameter of the crimping part was 0.3 mm, and the occupation ratio of the crimping part in the predetermined region was 6%. That is, in Comparative Example 2, the interval between the crimping parts was closer than that in Comparative Example 1.

[50% load, 50% return load]
In order to evaluate the stretchability of the stretchable laminated sheets according to Examples 1 to 4 and Comparative Examples 1 and 2, measurements of “50% going load” and “50% return load” were performed. In this measurement, a sample was prepared in a room maintained at a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5%, and the measurement was performed after storage for 1 hour. To cut out a stretchable laminated sheet sample, measure the dimensions with a stainless ruler (manufactured by Shinwa Co., Ltd.), place the identification ruler on the sample to be cut out, and cut out with a knife (feather S Seikan single blade, blade thickness: 0.245 mm). It was.

  A stretchable laminated sheet sample was cut into a rectangle of 50 mm in the stretch direction (CD) and 25 mm in the direction perpendicular to the stretch direction (MD), and the nonwoven fabric was peeled from both sides of the stretch film 2X. When peeling the nonwoven fabric from the elastic film 2X, the elastic film 2X was not extended by 3 mm or more. As shown in FIG. 12 (a), two sealing materials 31, 32 (3M) cut into a length of 40 mm, respectively, at both ends in the stretching direction (CD) of the stretchable film 2X from which the nonwoven fabric was peeled off. ScotchTM Premium Grade Filament Tape part number “898, width 25 mm”), two sealing materials 33 and 34 cut to 40 mm in length (3M, Scotch Premium Grade Film Tape part number “898”) . The sealing material 31 and the sealing material 32 were attached so that the adhesive surfaces overlap each other, and the sealing material 33 and the sealing material 34 were attached so that the adhesive surfaces overlap each other. Moreover, the sealing materials 31-34 were affixed so that the sample length of MD direction of the elastic film 2X might be set to 25 mm.

  As shown in FIG. 13, the seal material pasting portion in the prepared sample is respectively attached to the upper chuck 35 and the lower fixed chuck 36 of the Tensilon tester (Orientec Co., model number RTG-1225). Installed. At that time, the upper chuck 35 was adjusted so that the distance between the chucks was 15 mm, and was fixed so that no tension was applied. The chuck had a width of 25 mm or more and a height of 25 mm or more. After fixing, it was confirmed that the stretchable film 2X had no wrinkles or folds. The sample was stretched 15 mm vertically upward at a rate of 300 mm / min, and then the sample was returned to the initial inter-chuck distance at a rate of 300 mm / min. This was evaluated as a 100% stretched sample. The 170% stretched sample described later was stretched 25.5 mm at a speed of 300 mm / min as described above, and then returned to the initial chuck distance at a speed of 300 mm / min.

  When returning to the initial position, the chucks 35 and 36 were once unfixed and the sample was removed. Again, as shown in FIG. 12B, this sample was sealed with sealing materials 37 (38) and 39 (40) from above the sealing materials 31 (32) and 33 (34), respectively. As shown in FIG. 14 (a), the measurement sample was fixed so that the first pulled range was held between the chucks 35 and 36 of the tensile strength tester separated by 15 mm (the load was applied to the measurement sample during fixation). To avoid it). Next, the measurement sample (elastic film 2X) was stretched by 11.25 mm at a speed of 300 mm / min (FIG. 14B), and then returned to a stretching distance of 0 mm. The load (N / 25 mm) was continuously recorded, and the going load at the position of the stretch distance 7.5 mm (chuck distance 22.5 mm) (see FIG. 14C) at the first trip was “50”. % Load ". At the first return, the return load at an extension distance of 7.5 mm (distance between chucks: 22.5 mm) was evaluated as “50% return load”.

[Tensile strength]
Moreover, in order to evaluate the difficulty of fracture of the stretchable laminated sheets according to Examples 1 to 4 and Comparative Examples 1 and 2, the tensile strength was measured. In the measurement of tensile strength, a sample was prepared by the same method as the stress measurement described above, and a 100% stretched sample (measurement sample) was prepared. As shown in FIG. 14, the measurement sample was fixed so that the first pulled range was held between the chucks (fixed portions) of the tensile strength tester 15 mm apart as shown in FIG. 14. (Make sure that no load is applied to the measurement sample during fixation). In this state, the measurement sample was stretched at a speed of 100 mm / min until the sample broke. The load (N / 25 mm) was recorded continuously, and the maximum load was evaluated as the tensile strength.

[Peel strength]
Moreover, the measurement for evaluating the peeling strength of the elastic laminated sheet which concerns on Examples 1-4 and Comparative Examples 1 and 2 was performed. This measurement was performed after a sample was prepared in a room maintained at a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5% and stored for 1 hour. To cut out the sample, the dimensions were measured with a stainless ruler (manufactured by Shinwa Co., Ltd.), the ruler was placed on the sample to be cut out, and cut out with a knife (feather S Seikan single blade, blade thickness: 0.245 mm).

  A stretchable laminated sheet sample (non-woven fabric / stretchable film / nonwoven fabric three-layer structure) was cut out to a width of 45 mm (CD direction) and a length of 80 mm (MD direction)) to prepare a measurement sample.

  As shown in FIG. 15, a jig was prepared for sandwiching the long side portion 1a of the measurement sample 1X by 10 mm from both ends. For the jig, stainless steel panels 41, 42, 43, 44 having a width: 52 mm, a length: 100 mm, and a thickness of 2 mm are prepared, and are sufficiently along the long side portion 1a of each stainless steel panel 41, 42, 43, 44. Hook fasteners 45, 46, 47, and 48 (mechanical fastener part number “NC-2141”, width 25 mm, manufactured by 3M Co.) were pasted on a wide plane.

  Two sides that become the long side portion 1a of the sample 1X were sandwiched by 15 mm between stainless panels 41, 42, 43, and 44 having surface fasteners 45, 46, 47, and 48, respectively. Thereafter, the sample 1X was stretched by 15 mm at a speed of 50 mm / min in the expansion / contraction direction, and returned to the same original width as a 100% stretched sample. A sample stretched 25.5 mm and returned to the same original width was used as a 170% stretched sample. For the sample 1X after elongation, the portion sandwiched between the stainless steel panels 41, 42, 43, and 44 was removed, and cut into a width of 15 mm (CD direction) and a length of 80 mm (MD direction).

  As shown in FIG. 16, the non-woven fabric 3Y that was laminated (laminated) from the one end of the short side portion of the sample 1X to a distance of 20 mm was peeled from the stretchable film 2Y. When the width of the nonwoven fabric 3Y was increased after peeling, the width was returned to 15 mm before peeling. In addition, the peeled nonwoven fabric 3Y is the side where the crimping | compression-bonding part is formed. On the surface of the non-peeled nonwoven fabric 4Y, a Japanese paper tape (3M, flat paper masking tape 243J, product number “243JDIY-24”) 49 was adhered without protruding from the sample 1X.

From the end of the peeling nonwoven 3Y to parallel at the 10 mm, with two cut to length 30mm nonwoven fixing tape 61, 62 (3M ^Co., Scotch TM Premium Grade Filament Tape No. "898 Width 25mm") The end of the sandwiched and peeled nonwoven fabric 3Y was fixed. The peeling was not part at the way, nonwoven fixing tape 63, 64 (3M ^Co., Scotch TM Premium Grade Filament Tape No. "898 Width 25mm") nonwoven end was affixed.

  The sample was fixed to a Tensilon tester (Orientec Co., Ltd., model number RTG-1225) without tension so that the distance between chucks was 20 mm. The shape of the chucks 65 and 66 was 25 mm or more in width and 25 mm or more in height. At this time, the nonwoven fabric fixing tapes 61 and 62 attached to the end of the peeled nonwoven fabric 3Y were fixed to the chuck 65 so as not to protrude from the lower portion of the chuck 65 which can operate at the upper portion. Further, the lower layer of the chuck 66 was fixed with the remaining layer (layer made of stretchable film / nonwoven fabric / Japanese paper tape) 10 mm from the end portion after the nonwoven fabric 3Y was peeled off.

  The tensile peel strength was recorded by pulling the chuck 65 vertically upward at a speed of 500 mm / min. At that time, the angle formed by the sample surface made of the nonwoven fabric / stretchable film / nonwoven fabric / Japanese paper tape with respect to the sample plane forming the peeling interface between the nonwoven fabric 3Y and the stretchable film 2Y from the lower fixed chuck 66 is about 60 °. To keep.

  The integrated average of data recorded between 25 mm from 15 mm to 40 mm from the start of pulling of the recorded tension (N / 15 mm) was taken as the adhesive strength. The integral average is the following formula (1) when the adhesive strength f (x) (N / 15 mm) is continuous at the measurement lengths a, b, (a <x <b) (a = 15 mm, b = 40 mm). It is represented by Note that f (x) was obtained from the tension recorded from the Tensilon tester.

  In this example and comparative example, the adhesive strength determined above was performed five times on the same sample, and the average value was taken as the peel strength.

  Table 1 shows measured values of “50% going load”, “50% return load”, “tensile strength”, and “peel strength” in Examples 1 to 4 and Comparative Examples 1 and 2.

  The case where the elastic laminated sheet is used for the tab portion of an open type diaper is assumed. Here, when the wear target is an adult such as an elderly person, if the “50% load” is 2.5 (N / 25 mm) or less, the caregiver or the like pulls the tab portion without being particularly conscious, It can be made to wear to the wearing object without difficulty. In addition, when the subject to be worn is an infant or the like, if the “50% load” is less than 1.6 (N / 25 mm), the parent or the like pulls the tab without being particularly conscious of it, and further wears it comfortably on the subject to be worn. Can be made.

  Further, if the peel strength is 3.5 (N / 15 mm) or more, the nonwoven fabric is peeled off from the stretchable film while wearing a diaper or while wearing (in use). There is no end. If the “tensile strength” is 14 (N / 15 mm) or more, the tab portion will not break and break in normal use.

  As shown in Table 1, in Examples 1 to 4, the “50% load” was less than 1.6 (N / 25 mm), and the peel strength was 3.5 (N / 15 mm) or more. It was. In Comparative Examples 1 and 2, the peel strength was less than 3.5 (N / 15 mm).

  Next, Examples 5 to 8 and Comparative Examples 3 and 4 will be described. In Examples 5 to 8 and Comparative Examples 3 and 4, unlike Example 1 and the like, a spunbonded nonwoven fabric (basis weight 38 gsm) of 90% PET and 10% PP was used as the nonwoven fabric material.

[Example 5]
A stretchable laminated sheet according to Example 5 was produced in the same manner as in Example 1 except that the nonwoven fabric was different.

[Example 6]
A stretchable laminated sheet according to Example 6 was produced in the same manner as in Example 2 except that the nonwoven fabric was different.

[Example 7]
A stretchable laminated sheet according to Example 7 was produced in the same manner as in Example 3 except that the nonwoven fabric was different.

[Example 8]
A stretchable laminated sheet according to Example 8 was produced in the same manner as in Example 4 except that the nonwoven fabric was different.

[Comparative Example 3]
A stretchable laminated sheet according to Comparative Example 3 was produced in the same manner as Comparative Example 1 except that the nonwoven fabric was different.

[Comparative Example 4]
A stretchable laminated sheet according to Comparative Example 4 was produced in the same manner as Comparative Example 2, except that the nonwoven fabric was different.

  For Examples 5 to 8 and Comparative Examples 3 and 4, "50% bound load", "50% return load", "tensile strength", and "peel strength" were measured using the same measurement method as described above. Measurements were made. The measured values are shown in Table 2.

  As shown in Table 2, in Examples 5 to 8, “50% load” was 2.5 (N / 25 mm) or less, and the peel strength was 3.5 (N / 15 mm) or more. It was. In Comparative Examples 3 and 4, the peel strength was less than 3.5 (N / 15 mm).

  Next, Examples 9 to 12 and Comparative Examples 5 and 6 will be described. In Examples 9 to 12 and Comparative Examples 5 and 6, unlike the above Example 1 and the like, a spunbonded nonwoven fabric (basis weight 50 gsm) of 90% PET and 10% PP was used as the nonwoven fabric material.

[Example 9]
A stretchable laminated sheet according to Example 9 was produced in the same manner as in Example 1 except that the nonwoven fabric was different.

[Example 10]
A stretchable laminated sheet according to Example 10 was produced in the same manner as in Example 2 except that the nonwoven fabric was different.

[Example 11]
A stretchable laminated sheet according to Example 11 was produced in the same manner as in Example 3 except that the nonwoven fabric was different.

[Example 12]
A stretchable laminated sheet according to Example 12 was produced in the same manner as in Example 4 except that the nonwoven fabric was different.

[Comparative Example 5]
A stretchable laminated sheet according to Comparative Example 5 was produced in the same manner as Comparative Example 1 except that the nonwoven fabric was different.

[Comparative Example 6]
A stretchable laminated sheet according to Comparative Example 6 was produced in the same manner as in Comparative Example 2, except that the nonwoven fabric was different.

  For Examples 9 to 12 and Comparative Examples 5 and 6, “50% going load”, “50% return load”, “tensile strength”, and “peel strength” were measured using the same measurement method as described above. Measurements were made. The measured values are shown in Table 3.

  As shown in Table 3, the “50% bound load” of Examples 9 and 10 was less than 1.6 (N / 25 mm), and the peel strength was 3.5 (N / 15 mm) or more. . The “50% bound load” of Examples 11 and 12 was 2.5 (N / 25 mm) or less, and the peel strength was 3.5 (N / 15 mm) or more. In Comparative Examples 3 and 4, the peel strength was less than 3.5 (N / 15 mm).

  Next, Examples 13 to 18 and Comparative Examples 7 to 14 will be described. In Examples 13 to 18 and Comparative Examples 7 to 14, a spunbonded nonwoven fabric (basis weight 32 gsm) of 90% PET and 10% PP was used as the nonwoven fabric material, unlike Example 1 and the like described above.

[Example 13]
A stretchable laminated sheet according to Example 13 was produced in the same manner as in Example 1 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction. The arrangement | positioning of the crimping | compression-bonding part which concerns on Example 3 is aligned in the horizontal direction with adjacent crimping lines.

[Example 14]
A stretchable laminated sheet according to Example 14 was manufactured in the same manner as in Example 13 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Example 15]
A stretchable laminated sheet according to Example 15 was produced in the same manner as in Example 13 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Example 16]
The stretchable laminated sheet according to Example 13 was manufactured in the same manner as in Example 1 except that the inclination angle formed by one direction, which is the extension direction of the crimping line, and the arrangement of the crimped portions were different. . The arrangement of the crimping portions according to Example 16 is shifted from the lateral direction between adjacent crimping lines, and is in a staggered arrangement.

[Example 17]
A stretchable laminated sheet according to Example 17 was manufactured in the same manner as in Example 16 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Example 18]
A stretchable laminated sheet according to Example 18 was produced in the same manner as in Example 16 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Comparative Example 7]
A stretchable laminated sheet according to Comparative Example 7 was produced in the same manner as in Example 13, except that one direction which is the extending direction of the crimping line was different in inclination angle with respect to the stretch direction.

[Comparative Example 8]
A stretchable laminated sheet according to Comparative Example 8 was produced in the same manner as in Comparative Example 7, except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Comparative Example 9]
A stretchable laminated sheet according to Comparative Example 9 was produced in the same manner as in Comparative Example 7, except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Comparative Example 10]
A stretchable laminated sheet according to Comparative Example 10 was produced in the same manner as in Comparative Example 7, except that one of the extending directions of the crimping line had a different inclination angle with respect to the stretchable direction.

[Comparative Example 11]
A stretchable laminated sheet according to Comparative Example 11 was manufactured in the same manner as in Example 16 except that one direction which is the extending direction of the crimping line was different in inclination angle with respect to the stretch direction.

[Comparative Example 12]
A stretchable laminated sheet according to Comparative Example 12 was produced in the same manner as Comparative Example 11, except that one direction which is the extending direction of the crimping line was different in inclination angle with respect to the stretchable direction.

[Comparative Example 13]
A stretchable laminated sheet according to Comparative Example 13 was produced in the same manner as in Comparative Example 11, except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

[Comparative Example 14]
A stretchable laminated sheet according to Comparative Example 14 was produced in the same manner as in Comparative Example 11 except that one direction which is the extending direction of the crimping line was different in inclination angle with respect to the stretchable direction.

  Also for Examples 13 to 18, “50% going load”, “50% return load”, “tensile strength”, and “peel strength” were measured by the same measurement method as described above. The measured values are shown in Table 4. Further, for “Comparative Examples 7 to 14”, “50% going load”, “50% return load”, “tensile strength”, and “peel strength” were measured by the same measurement method as described above. The measured values are shown in Table 5.

  As shown in Table 4, the “50% load” in Examples 13 to 18 was less than 1.6 (N / 25 mm), and the peel strength was 3.5 (N / 15 mm) or more. . Further, as shown in Table 5, in Comparative Examples 7, 8, 11 and 12, all of the “50% load” is 1.6 (N / 25 mm) or more, and the peel strength is 3.5. (N / 15 mm). In Comparative Examples 9, 10, 11, and 12, the peel strength was less than 3.5 (N / 15 mm).

  Next, Examples 19 to 21 and Comparative Examples 15 to 18 will be described. In Examples 19 to 21 and Comparative Examples 15 to 18, unlike the above Example 1 and the like, a spunbonded nonwoven fabric (basis weight 50 gsm) of 90% PET and 10% PP was used as the nonwoven fabric material.

[Example 19]
A stretchable laminated sheet according to Example 19 was manufactured in the same manner as in Example 5 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction. The arrangement | positioning of the crimping | compression-bonding part which concerns on Example 3 is aligned in the horizontal direction with adjacent crimping lines.

[Example 20]
A stretchable laminated sheet according to Example 20 was produced in the same manner as in Example 19 except that one direction which is the extending direction of the crimping line was different in inclination angle with respect to the stretch direction.

[Example 21]
A stretchable laminated sheet according to Example 21 was produced in the same manner as in Example 19 except that one of the extending directions of the crimping line was different in inclination angle with respect to the stretchable direction.

  As shown in Table 6, the “50% bound load” of Examples 15 to 17 was less than 1.6 (N / 25 mm), and the peel strength was 3.5 (N / 15 mm) or more. . In each of Comparative Examples 15 to 18, the “50% load” was 1.6 (N / 25 mm) or more, and the peel strength was less than 3.5 (N / 15 mm). In Comparative Examples 9, 10, 11, and 12, the peel strength was less than 3.5 (N / 15 mm). In addition, about the comparative examples 15 and 16, in the case of measurement of peeling strength, since the nonwoven fabric fractured | ruptured, it was not measurable.

  As mentioned above, although embodiment and the Example were described, this invention is not limited only to said embodiment or Example. For example, the sanitary material using the stretchable laminated sheet is not limited to a disposable diaper, and may be a disposable sanitary cap. Further, the stretchable laminated sheet can be used not only for a tab portion of a disposable diaper but also for a head fixing portion of a disposable sanitary cap. Furthermore, the stretchable laminated sheet can also be used for applications such as supporters, bandages, mask ear hooks, and heat retaining members.

  1A, 1B, 1C, 1D ... stretchable laminated sheet, 2 ... stretchable film, 3 ... non-woven fabric, 4 ... non-woven fabric, 5, 5A ... crimping part, 6 ... regulating crimping part (crimping part), 7 ... non-crimping part, 8 ... crimp line, 11A, 11B ... engagement part, 22 ... mechanical fastener, 25 ... laminate (main body part), 51 ... auxiliary crimp part, D1 ... stretch direction, D2 ... one direction, D3 ... lateral direction, .theta .... tilt Angle, Wb: width of the auxiliary crimping portion in the expansion / contraction direction, Wc: width of the crimping line in the expansion / contraction direction.

Claims (12)

Stretch film,
A non-woven fabric laminated on at least one surface of the stretchable film;
The non-woven fabric and the stretchable film are crimped and depressed, and a crimping line,
The crimping line extends in one direction that obliquely intersects the stretching direction of the stretchable film,
A plurality of the crimping lines are provided side by side in the lateral direction orthogonal to the one direction,
The stretchable laminated sheet, wherein an inclination angle in one direction with respect to the stretch direction is 15 ° or more and 75 ° or less. In the crimping line, the nonwoven fabric and the stretchable film are crimped and recessed, and a plurality of crimped portions are formed side by side in the one direction.
The stretchable laminated sheet according to claim 1, wherein the crimping portion is longer in the one direction than in the lateral direction. Between the plurality of crimping lines, the nonwoven fabric and the stretchable film are crimped and provided with a plurality of recessed auxiliary crimping portions,
The stretchable laminated sheet according to claim 1 or 2, wherein a width of the auxiliary crimping portion in the stretch direction is smaller than a width of the crimping line in the stretch direction.   The stretchable laminated sheet according to any one of claims 1 to 3, wherein the nonwoven fabric is embedded in the stretchable film in at least a part of the non-crimped portion where the nonwoven fabric and the stretchable film are not crimped. .   The plurality of crimping parts of one of the crimping lines adjacent to each other among the plurality of crimping lines are arranged in the lateral direction with respect to the plurality of crimping parts of the other crimping line. 2. The stretchable laminated sheet according to 2.   The plurality of crimping portions of one of the crimping lines adjacent to each other among the plurality of crimping lines are arranged offset from the lateral direction with respect to the plurality of crimping portions of the other crimping line. 2. The stretchable laminated sheet according to 2.   Under the conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5%, the stretchable film from which the nonwoven fabric was peeled was stretched by 75% at a speed of 300 mm / min, and then stretched at a speed of 300 mm / min. The stretchability according to any one of claims 1 to 6, wherein the load when returning to the previous initial position and then performing 50% elongation at a speed of 300 mm / min is 2.5 N / 25 mm or less. Laminated sheet.   The stretchable laminated sheet according to claim 7, wherein the load is less than 1.6 N / 25 mm.   Under the conditions of a temperature of 23 ± 2 ° C. and a humidity of 50 ± 5%, a peel test is performed in which the stretchable film and the nonwoven fabric are peeled at a peel rate of 500 mm / min along the peel direction opposite to each other. The stretchable laminated sheet according to any one of claims 1 to 8, wherein an integrated average of a plurality of adhesive strengths obtained during peeling is 3.5 N / 15 mm or more. A stretch laminate sheet comprising a stretch film and a nonwoven fabric laminated on at least one surface of the stretch film; and
It is one of a pair of engaging parts that form a mechanical fastener, and includes an engaging part fixed to the stretchable laminated sheet,
The stretchable region of the stretchable laminated sheet is
The non-woven fabric and the stretchable film are crimped and provided with a depressed crimp line,
The crimping line extends in one direction that obliquely intersects the stretching direction of the stretchable film,
A plurality of the crimping lines are provided side by side in the lateral direction orthogonal to the one direction,
The inclination angle of the one direction with respect to the expansion / contraction direction is 15 ° or more and 75 ° or less,
The engaging portion is a tab member provided at one end of both ends of the stretchable laminated sheet in the stretchable direction. The stretchable laminated sheet further comprises a stretch restriction region in at least one of the two regions sandwiching the stretchable region in the stretch direction.
The stretch regulation region includes one or a plurality of regulation crimping portions that are recessed by crimping the nonwoven fabric and the stretchable film,
The tab member according to claim 10, wherein a length of the restriction crimping portion in the expansion / contraction direction is longer than a width of the crimping line in the lateral direction. Of the pair of engaging portions forming the mechanical fastener, a sanitary material including a tab portion including one of the engaging portions and a main body portion including the other engaging portion,
The tab portion is
A stretch laminate sheet comprising a stretch film and a nonwoven fabric laminated on at least one surface of the stretch film; and
The one engaging portion fixed to the stretchable laminated sheet,
The stretchable region of the stretchable laminated sheet is
The non-woven fabric and the stretchable film are crimped and provided with a depressed crimp line,
The crimping line extends in one direction that obliquely intersects the stretching direction of the stretchable film,
A plurality of the crimping lines are provided side by side in the lateral direction orthogonal to the one direction,
The inclination angle of the one direction with respect to the expansion / contraction direction is 15 ° or more and 75 ° or less,
The engaging portion is a sanitary material provided at one end of both ends of the stretchable laminated sheet in the stretch direction.

Images