JP2008264077A - Absorbent article and manufacturing method of absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article with an absorbent body for which a plurality of low rigidity parts are formed. <P>SOLUTION: The absorbent article 1 of this invention comprises an at least partially liquid permeable surface sheet 2, a liquid impermeable back surface sheet 3, and a liquid retaining absorbent body 10 disposed between the surface sheet 2 and the back surface sheet 3. Then, the absorbent body 10 is provided with a plurality of openings 13 as the low rigidity parts where rigidity is lower than surrounding areas. Also, for the buckling rigidity value of the absorbent body 10, (1) a load in 5 mm compression is ≤0.8N and (2) a value for which the load in the 5 mm compression is subtracted from the maximum load is ≤0.2N. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article.

  Conventionally, various measures have been made for absorbent articles in order to improve permeability in excrement such as menstrual blood and to obtain deformability that conforms to the shape of the body. For example, by forming a plurality of embosses on the absorber, the absorber can be deformed so as to follow the shape of the body. However, the embossed part formed in the absorbent body is in a high-density state by compressing the fibers constituting the absorbent body. May decrease.

On the other hand, an absorbent article has been proposed in which a needle-like protrusion or the like is inserted into the absorbent body and a through-hole or the like penetrating the back surface of the absorbent body is formed to make the absorbent body flexible (for example, Patent Document 1).
Japanese Patent No. 3556581

  Here, the absorbent article of Patent Document 1 is intended to soften the absorbent body by inserting a needle-like protrusion or the like into the absorbent body and forming a through-hole or the like that penetrates the back surface of the absorbent body. The fiber density around the through-holes formed by the needle-like protrusions is increased, and the rigidity is increased. For this reason, the shape of the through-hole or the like is not easily deformed when a force is applied to the absorber in a direction in which the absorber is extended, or when a force is applied in a direction in which the absorber is contracted. For this reason, this absorber may be hard to deform | transform flexibly following the shape and movement of the body, and this may give a wearer a foreign object feeling.

  An object of this invention is to provide an absorbent article provided with the absorber in which the some low-rigidity part was formed.

  (1) It has a width direction and a longitudinal direction perpendicular to the width direction, and at least a part is a liquid-permeable top sheet, a liquid-impermeable back sheet, and between the top sheet and the back sheet A liquid-retaining absorbent body, wherein the absorbent body has a plurality of low-rigidity portions whose rigidity is lower than that of the surrounding region, and the buckling rigidity value of the absorbent body (1) The absorbent article in which the load at the time of 5 mm compression is 0.8 N or less, and (2) the value obtained by subtracting the load at the time of 5 mm compression from the maximum load is 0.2 N or less.

  (2) The buckling rigidity value of the absorbent article is (1) the load at 5 mm compression is 1.6 N or less, and (2) the value obtained by subtracting the load at 5 mm compression from the maximum load is 0. The absorbent article as described in (1) which is 4N or less.

  (3) The absorbent body has a non-low rigidity region where the low rigidity portion is not formed, and the non-low rigidity region has a length in the longitudinal direction of 40 mm or more and a length in the width direction of 10 mm. In addition to the above, the absorbent article according to (1) or (2), which is formed at a position 30 mm or more away from the longitudinal rear edge disposed on the rear side of the body when worn.

  (4) Each of the plurality of low-rigidity portions has a length in the longitudinal direction of 0.5 mm to 15 mm, and a length in the width direction of 0.5 to 15 mm. Absorbent article according to crab.

  (5) The absorbent article according to any one of (1) to (4), wherein each of the plurality of low-rigidity portions is an opening.

  (6) The absorbent article according to (5), wherein a plurality of high-rigidity regions are formed in the absorbent body, and each of the plurality of openings is formed in each of the plurality of high-rigidity regions.

  (7) The absorbent article according to (6), wherein each of the plurality of openings is formed by forming a cut in each of the plurality of high-rigidity regions and widening the cut.

  (8) The plurality of openings are formed continuously in the longitudinal direction and are formed to form a plurality of rows extending in the longitudinal direction, and the longitudinal direction is between the plurality of rows. The absorbent article according to any one of (5) to (7), wherein an attached wire extending to the surface is formed.

  (9) The absorbent article according to any one of (1) to (4), wherein each of the plurality of low-rigidity parts is a low-weight part having a lower weight than a surrounding region.

  (10) The absorbent article according to (9), wherein a basis weight in the plurality of low basis weight portions is 0.5 or less with respect to a basis weight in the surrounding area.

  (11) The absorbent article according to any one of (1) to (4), wherein an auxiliary absorbent is further disposed between the absorbent and the topsheet.

  (12) A laminate in which an absorbent material is laminated is disposed between the absorber and the top sheet, and a part of the absorbent material constituting the laminate is a part of the plurality of openings. The absorbent article according to any one of (5) to (8), which is disposed so as to enter the opening.

  ADVANTAGE OF THE INVENTION According to this invention, an absorbent article provided with the absorber in which the some low-rigidity part was formed can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view of an absorbent article 1 according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of the absorbent article 1. FIG. 3 is an enlarged view of the absorber 10 in the region a in FIG. FIG. 4 is a partially enlarged view of the absorbent article 1 in FIG. FIG. 5A is a diagram illustrating a process of forming the compression portion 11 on the absorbent body 10 ′ with the embossing roll 700. FIG.5 (b) is a top view of absorber 10 'in which the compression part 11 was formed. FIG. 5C is an enlarged view of the formed compression portion 11. FIG. 6A is a diagram illustrating a process of forming the cut 131 in the compression portion 11 of the absorbent body 10 ′ with the cutter roll 800. FIG. 6B is a plan view of the absorbent body 10 ′ in which the cut 131 is formed in the compression unit 11. FIG. 6C is an enlarged view of the cut 131 formed in the compression unit 11. FIG. 7A is a diagram illustrating a process for widening the cut 131 formed in the absorber 10 ′ by the gear roll 900. FIG. 7B is a plan view of the absorbent body 10 ′ in which the notch 131 is widened. FIG. 7C is an enlarged view of the widened cut 131. FIG. 8 is a plan view of an absorbent article 1A according to the second embodiment of the present invention. FIG. 9 is a cross-sectional view taken along the line BB of the absorbent article 1A. FIG. 10 is a CC cross-sectional view of the absorbent article 1A. FIG. 11 is a plan view of an absorbent article 1B according to the third embodiment of the present invention. FIG. 12 is a DD cross-sectional view of the absorbent article 1B. FIG. 13 is a cross-sectional view of an absorbent article 1C according to the fourth embodiment of the present invention. FIG. 14 is a plan view of an absorbent article 1D according to the fifth embodiment of the present invention. FIG. 15 is an EE cross-sectional view of the absorbent article 1D.

[1] First Embodiment An absorbent article 1 according to a first embodiment of the present invention will be described with reference to FIGS.

[1.1] Overall Structure As shown in FIGS. 1 and 2, the absorbent article 1 is substantially vertically long, and at least a part of the liquid-permeable top sheet 2 and a liquid-impermeable back sheet 3 are used. And a liquid retaining absorbent 10 disposed between the top sheet 2 and the back sheet 3. The absorber 10 is formed with a plurality of openings 13 as low rigidity portions.

  As shown in FIG. 2, the back sheet 3, the absorbent body 10, and the top sheet 2 are laminated. In other words, the absorber 10 is disposed so as to be sandwiched between the top sheet 2 and the back sheet 3. The outer edge portions of the top sheet 2 and the back sheet 3 disposed so as to overlap each other beyond the outer edge in the width direction or the longitudinal direction of the absorbent body 10 are bonded so as to be bonded by an adhesive such as a hot melt adhesive. The Here, the front sheet 2 and the back sheet 3 are as described later.

[1.2] Absorber [1.2.1] Overall Configuration As shown in FIGS. 1 to 4, the absorber 10 includes a plurality of high-rigidity compression portions 11 and the remaining non-compression portions 12. Each of the plurality of compression portions 11 is a vertically long absorbent body in which an opening 13 is formed. The absorber 10 absorbs liquid and has a liquid retaining property for retaining the absorbed liquid.

The absorbent body 10 is formed by laminating pulp 20 as an absorbent material with a basis weight adjusted in the range of 50 to 600 g / m ^{2 on} the upper surface of the tissue 30 as a covering sheet having a basis weight of 15 g / m ² , The end portion of the tissue 30 is folded back and the pulp 20 is taken up, and the ends of the tissue 30 in the short direction are overlapped with each other and pressed with embossing or the like.

  Examples of the absorbent material include, in addition to the above-mentioned pulp, for example, chemical pulp, rayon, acetate, natural cotton, polymer absorber, fibrous polymer absorber, synthetic fiber, foam, etc., alone or a mixture thereof it can. In particular, it is preferable that it is difficult to lose its shape and has little chemical stimulation. These may have been mixed at the time of spinning to enhance molecular orientation and to have a cross-sectional shape such as Y-type or C-type. Moreover, in order to improve the slipperiness between fibers, the oil agent may be applied to or contained in the fibers.

  As a covering sheet, in addition to the above-mentioned tissue, for example, cellulose fibers such as pulp, chemical pulp, rayon, acetate, natural cotton, and thermoplastic resins such as polyethylene, polypropylene, polyethylene terephthalate, or a core-sheath type, core Non-woven fabrics formed by hydroentangling, spunbonding, through-air, etc., by combining single and composite sheath-type eccentric and side-by-side type fibers.

[1.2.2] Compression part The compression part 11 is an area formed so as to have higher rigidity than the surrounding area, and a plurality of compression parts 11 are formed at predetermined intervals in the planar direction of the absorbent body 10. . Here, the non-compressed portion 12, which is a region having lower rigidity than the compressed portion 11, is formed in the region around the compressed portion 11. In other words, the absorbent body 10 has a plurality of compression parts 11 and a remaining non-compression part 12.

  The compression part 11 is an area where the opening 13 is formed. In other words, it is an area where the cutter blade for forming the slit-shaped cut 131 is pressed. That is, in order to form the notch 131 with the cutter blade, it is preferable that the portion to which the cutter blade is pressed is highly rigid. Therefore, this portion is adjusted to be highly rigid. Here, since it is not preferable that the rigidity of the absorbent body 10 as a whole becomes too high, the compression portion 11 is formed only in a region in the vicinity of the portion where the cutter blade is pressed.

The compression part 11 in this embodiment is formed by pressing a predetermined region of the absorbent body 10 from both sides with an embossing roll or the like to be described later. The density of the compressed portion 11 formed by pressing a predetermined region of the absorbent body 10 ′ in a state where the density is uniform is 0.12 to 1.0 g / cm ³ , preferably 0.2 to 0.6 g / cm ^3. The density of the non-compressed portion 12 which is an unpressed region is 0.06 to 0.12 g / cm ³ , preferably 0.07 to 0.1 g / cm ³ .

  The density in the compression part 11 and the non-compression part 12 is calculated | required as follows. First, predetermined portions of the compression unit 11 and the non-compression unit 12 are cut, and an enlarged photograph of the cut surface is taken with a digital microscope (VHX-100 manufactured by Keyence). And while calculating | requiring each minimum thickness from an enlarged photograph and cutting out the absorber 10 30 mm x 30 mm and measuring a basic weight, it calculates | requires by calculating the density in each.

  Moreover, since the compression part 11 is an area | region formed by pressing in the thickness direction, it forms so that thickness may become thinner than the non-compression part 12. FIG. That is, the compression part 11 is an area | region where both surfaces in the absorber 10 were formed in concave shape.

[1.2.3] Opening The opening 13 is mainly formed in the compression part 11. Specifically, as shown in FIG. 1, the opening 13 is formed in an elliptical shape that connects both ends formed in the non-compressed portion 12 on the outer side in the longitudinal direction of the compressed portion 11. That is, the opening 13 is mainly formed in the compression part 11, but both ends in the longitudinal direction and the vicinity thereof are formed in the non-compression part 12. The opening 13 is formed to have a longer dimension than the compression portion 11 in the longitudinal direction.

  The dimension in the width direction of the opening 13 is 0.5 to 15 mm, preferably 1 to 5 mm, and the dimension in the longitudinal direction is 0.5 to 15 mm, preferably 5 to 10 mm. When the dimension in the width direction and the longitudinal direction of the opening 13 is smaller than 0.5, a force for contracting the absorbent body 10 in the longitudinal direction or the width direction is applied even if a large number of openings 13 are formed in the absorbent body 10. The flexibility may be inferior due to less shrinkage. Conversely, when the dimension in the width direction and the longitudinal direction of the opening 13 is larger than 15 mm, it becomes difficult to be flexibly deformed in the thickness direction of the absorbent body 10, for example, so that the absorbent article including the absorbent body 10 is along the body. When arranged, it is difficult to adjust to subtle unevenness of the body, and the absorbent body 10 may be twisted, which is not preferable. The opening 13 is preferably 10% or less with respect to the surface area of the absorber 10.

  As shown in FIG. 1, the openings 13 are formed in a staggered pattern in the planar direction. Here, the interval between adjacent openings 13 is preferably 2 mm to 20 mm. When this interval is smaller than 2 mm, the absorbent body 10 may be broken and the absorbent body 10 may be damaged. For example, when an absorbent article including the absorbent body 10 is arranged along the body, It may be difficult to adjust to unevenness. Moreover, when this space | interval is larger than 20 mm, it becomes difficult to deform | transform flexibly in the thickness direction in the absorber 10, and is not preferable.

  Further, as described above, both ends of the opening 13 in the longitudinal direction are formed in the non-compressed portion 12. As will be described later, the opening 13 is formed by widening the slit-shaped cut 131 formed in the compression portion 11 extending in the longitudinal direction in the width direction. By the widening process, the end in the longitudinal direction of the cut 131 is formed. By breaking the fiber entanglement around the part, the opening 13 is formed so as to keep the opening 13 open. The opening 13 is formed such that both ends in the longitudinal direction of the opening 13, in other words, both ends in the longitudinal direction of the notch 131 are positioned at the non-compressed portion 12. That is, the opening 13 is formed so that both ends in the longitudinal direction of the opening 13 are located in the non-compressed portion 12 where fiber entanglement easily occurs. Here, both end portions formed in the non-compressed portion 12 in the opening 13 are formed at positions separated from the longitudinal end portion in the compressed portion 11 by 0.5 mm to 10 mm.

  The opening 13 is formed by widening a slit-shaped cut 131 in the width direction. In this widening process, a gear roll 900 is used as will be described later. As shown in FIG. 4, the absorber 10 is a portion where the gear teeth 911 and 922 formed on the first gear roll 910 and the second gear roll 920 constituting the gear roll 900 are in contact with each other, and between the notches 131. A linear attached wire 140 is formed therebetween. That is, the opening 13 is formed continuously in the longitudinal direction and is formed to form a plurality of rows extending in the longitudinal direction, and an auxiliary wire 140 extending in the longitudinal direction is provided between the plurality of rows. It is formed. The form of the attached wire 140 differs depending on the position and angle at which the gear teeth 911 and 921 of the absorbent body 10 ′ contact.

[1.2.4] Manufacturing method The manufacturing method of the absorber 10 is demonstrated with reference to FIGS.
First, the pulp 20 as an absorbent material having a basis weight adjusted in the range of 50 to 600 g / m ² is laminated on the tissue 30 as a covering sheet having a basis weight of 15 g / m ² , and the end of the tissue 30 in the short direction And the pulp 20 is rolled up, the ends of the tissue 30 in the short direction are overlapped, and pressed with embossing or the like to form the absorbent body 10 '.

  Next, as shown in FIG. 5A, a plurality of compression portions 11 are formed on the absorbent body 10 ′ with an embossing roll 700 as embossing means. Specifically, the first embossing roll 710 having protrusions 711 formed on the surface at predetermined intervals and the first embossing roll 710 are arranged so as to face each other with a predetermined gap so that the protrusions 721 correspond to the protrusions 711. A plurality of compression parts 11 are formed by passing absorber 10 'between the 2nd embossing rolls 720 formed.

  As shown in FIGS. 5 (b) and 5 (c), the high-rigidity compressed portions 11 that are pressed in the thickness direction on the surface of the absorber 10 'are formed in a staggered manner. . The compression part 11 is formed in a rectangular shape that is long in the longitudinal direction of the absorbent body 10 ′. Here, the length in the longitudinal direction of the compression part 11 is 1 to 20 mm shorter than the length in the longitudinal direction of a slit-shaped cut 131 described later. For example, the length in the longitudinal direction of the high rigidity region 11 is 1 to 25 mm. In this case, the length of the highly rigid region 11 in the width direction is 2 to 15 mm. Further, the interval between the high-rigidity regions 11 is 0.5 to 20 mm.

  Subsequently, as illustrated in FIG. 6A, a slit-shaped cut 131 is formed in the compression portion 11 formed in the absorbent body 10 ′ by the cutter roll 800. Specifically, a first cutter roll 810 having cutter blades 811 formed on the surface at predetermined intervals, and a second cutter having a flat surface arranged to face the first cutter roll 810 with a predetermined gap therebetween. A slit 131 is formed in each of the plurality of compression portions 11 by passing the absorbent body 10 ′ between the roll 820.

  The cutter blade 811 is formed so as to correspond to each of the plurality of compression portions 11 formed by the embossing roll 700. Further, the length of the cutter blade 811 in the MD direction is formed to be longer than the length of the protrusion 711 in the MD direction. That is, as shown in FIGS. 6B and 6C, the length in the longitudinal direction of the slit-shaped cut 131 formed in the compression portion 11 is longer than the length in the longitudinal direction of the compression portion 11. Formed as follows. The notches 131 are formed so that both ends in the longitudinal direction extend from the compression portion 11 to the non-compression portion 12.

  The slit-shaped cut 131 is formed with a length of 2 to 30 mm in the longitudinal direction, and extends from both ends of the compressed portion 11 to the non-compressed portion 12 by 0.5 to 10 mm. Here, when the length in the longitudinal direction of the notch 131 is smaller than 2 mm, it is not preferable because the notch 131 may not be widened even by processing with a gear roll 900 described later. Moreover, although the length dimension in the longitudinal direction of each notch 131 may differ, in order to make uniform how to apply the force to each notch 131 at the time of widening by the gear roll 900, the length of each other is the same as much as possible. Is preferred. Even when the lengths in the longitudinal direction are different, it is preferable that the difference is within 50% of the length in the longitudinal direction.

  Further, the interval in the width direction between the cuts 131 is 2 to 20 mm, and the interval in the longitudinal direction is 2 to 20 mm. Here, when the interval is narrower than 2 mm, the absorbent body 10 may break when widened by the gear roll 900, which is not preferable.

  Here, the cutter blade 811 cuts a plurality of places in the absorbent body 10 ′ to form the cut 131, but the place where the cutter blade 811 cuts is mainly the compression portion 11, and therefore, compared with the non-compression portion 12. It can cut suitably. In other words, the fibers are difficult to move in the compression section 11, the high density of the fibers is high, the cutter blades are difficult to move, and the air layer formed between the fibers is small, so the cutter blade 811 slips. Since it becomes difficult, the notch 131 is formed suitably.

  Further, as shown in FIG. 7A, the notch 131 is formed by widening the absorbent body 10 'in which the slit-like cut 131 is formed in the high-rigidity region 11 in the width direction by the gear roll 900 as the biting means. Is widened to form the opening 13. Specifically, a first gear roll 910 in which gear teeth 911 formed on the surface so as to extend in the circumferential direction are formed at predetermined intervals in a width direction orthogonal to the circumferential direction, and a predetermined gap from the first gear roll 910. The absorbent body 10 'is passed between the second gear roll 920 having gear teeth 921 which are arranged so as to face each other and are alternately meshed with the gear teeth 911 so as to extend in the circumferential direction. Thus, the absorbent body 10 'is widened in the width direction and the cut 131 is widened in the width direction. Here, the gear teeth 911 may be continuous streaks (a shape extending in the CD direction) or intermittent (a shape extending intermittently in the CD direction). For example, the gear teeth 131 may be intermittently formed according to the length in the longitudinal direction of the absorbent body 10 ′.

  Specifically, two gear teeth 911 abut from the upper surface between a predetermined notch 131 and a notch 131 adjacent to the predetermined notch 131, and an intermediate position between the two gear teeth 911 from the lower surface. The gear teeth 921 are brought into contact with the position, and the width is increased by passing the gear roll.

  Here, by performing the widening process with the above-described gear roll 900, as shown in FIGS. 4 and 7B, between the predetermined opening 13 and the opening 13 adjacent to the predetermined opening 13 in the width direction. The attached wire 140 is formed. The form of the attached wire 140 differs depending on the position and angle at which the gear teeth 911 and 921 of the absorbent body 10 ′ contact. For example, when the gear teeth 911 are widened by the above-described gear roll 900 such that the gear teeth 911 are in contact with the notches 131, the attached wire 140 is formed so as to connect the plurality of openings 13 to each other.

  By the above-mentioned widening process, the entangled state of the fibers arranged at both ends of the cut 131 (both ends of the opening 13) is broken so that the fibers are loosened, so that the widened opening state is maintained. ing. In the present embodiment, since both ends of the cut 131 (both ends of the opening 13) are located in the non-compressed portion 12, the entangled state can be suitably broken and the fibers can be loosened during the widening process. Thereby, the absorber 10 which has the opening 13 which can maintain an opening state suitably can be formed.

[1.3] Rigidity (buckling strength)
[1.3.1] Absorber The buckling strength as rigidity in the absorber 10 is a load of 0.8 N or less when compressed at 5 mm, and a value obtained by subtracting the load during compression of 5 mm from the maximum load is 0.2 N. The following is preferable. Here, the measuring method of the buckling strength in the absorber 10 is as follows.

(1) The rear end portion of the absorber is cut by 3 mm, and is cut out with a dimension of 50 mm in the longitudinal (MD) direction × 20 mm in the width (CD) direction.
(2) The absorbent body 10 is formed into a columnar shape so that the longitudinal (MD) direction edges are opposed to each other, and the staple (stapler core: No. 10-M: Max Co., Ltd.) is fastened at two locations.
(3) The absorber 10 is compressed by 15 mm under the condition of 25 mm / min by Instron (model number 5564) manufactured by Instron Japan.
(4) Read the numerical value when the compression load is 0.05 N from the position where the compression load is 0.05 N and the maximum compression load. Here, the state where the compression load is 0.05 N is the state where the terminal hits the sample.

  When the buckling strength of the absorbent body 10 is the above value, it can be said that the absorbent body 10 can be flexibly deformed in the width direction. Therefore, the absorbent article 1 provided with the absorber 10 can be flexibly deformed in the width direction.

[1.3.2] Absorbent article Moreover, the buckling strength as rigidity in the absorbent article 1 is a value obtained by subtracting the load at the time of 5 mm compression from the maximum load when the load at the time of 5 mm compression is 1.6 N or less. Is preferably 0.4 N or less. Here, the measuring method of the buckling strength in the absorbent article 1 is as follows.
(1) The absorbent article 1 is cut at 3 mm from the rear end of the absorbent body 10 and cut out with a dimension of 50 mm in the longitudinal (MD) direction × 20 mm in the width (CD) direction.
(2) The absorbent article 1 is formed into a cylinder so that the longitudinal (MD) direction edges face each other with the topsheet 2 side facing outward, and staples (stapler core: No. 10-M: Max Co., Ltd.) It is fixed by fastening two places.
(3) The absorbent article 1 is compressed 15 mm under the condition of 25 mm / min by Instron (model number 5564) manufactured by Instron Japan.
(4) Read the numerical value when the compression load is 0.05 N from the position where the compression load is 0.05 N and the maximum compression load. Here, the state where the compression load is 0.05 N is the state where the terminal hits the sample.

  When the buckling strength of the absorbent article 1 is the above-described value, it can be said that the absorbent article 1 can be flexibly deformed in the width direction. That is, at the time of wearing, the absorbent article 1 is deformed flexibly in the width direction so as to conform to the shape of the body, and is deformed following an action such as walking.

[1.4] Others Here, the opening 13 changes its shape preferentially over the surrounding area of the opening 13. Specifically, when a force is applied to the absorbent article 1 so that the absorbent article 1 extends in the plane direction, the opening 13 preferentially spreads and when it is applied to shrink in the plane direction. Is preferentially deformed so that the width of the opening 13 becomes narrower. Since a plurality of openings 13 are formed in the absorbent article 1, each of the openings 13 is deformed as described above, so that it is possible to prevent the force from being concentrated at one place and being bent carelessly. In other words, since the absorbent article 1 is deformed following the movement of the body, it is possible to suppress the occurrence of large wrinkles. Thereby, giving a wearer a foreign material feeling can be suppressed.

[2] Second Embodiment An absorbent article 1A according to the second embodiment will be described with reference to FIGS. As shown in FIG. 8, the absorbent article 1 </ b> A in the second embodiment is different except that the absorbent article 1 </ b> A in the second embodiment has a non-low rigidity region 15 in which the opening 13 is not formed at the center of the absorbent article 1 in the first embodiment. The same applies to the absorbent article 1 in the first embodiment. Below, 1 A of absorbent articles are demonstrated centering on the point which is different from the absorbent article 1 in 1st Embodiment.

  As shown in FIG. 8, the absorbent article 1A is formed such that a plurality of openings 13 are dispersed in the plane direction, and a non-low-rigid region 15 in which no opening 13 is formed is formed in the center of the absorbent article 1A. Is done. The non-low-rigid area 15 is formed at a position where an excretion part from which menstrual blood or the like is excreted comes into contact.

  Specifically, as shown in FIG. 9, a non-low rigidity region 15 is formed in the center in the width direction in the center region in the longitudinal direction. Openings 13 are formed outside the non-low rigidity region 15 in the width direction. As shown in FIG. 10, the non-low rigidity region 15 is not formed in the outer region in the longitudinal direction, and only the opening 13 is formed.

  Here, the non-low-rigid region 15 preferably has a length in the longitudinal direction of 40 mm or more, and more preferably 60 to 120 mm. The non-low-rigidity region 15 preferably has a length in the width direction of 10 mm or more, and more preferably 25 to 50 mm.

  Furthermore, the non-low-rigidity region 15 is formed at a position 30 mm or more away from the rear end in the longitudinal direction arranged on the rear side of the body when the absorbent article 1A is mounted.

  This is because the opening 13 is a region where body fluid that has contacted the topsheet 2 cannot be drawn into the absorber 10, and it is preferable not to form the opening 13 in a region where body fluid is likely to adhere, walking, etc. This is because it is preferable that an opening 13 is formed in the rear region of the labia, which is a portion where the skin surface moves greatly during the operation.

  Here, the shape of the non-low-rigidity region 15 is not particularly limited. For example, the non-low-rigidity region 15 can be formed in a bowl shape, a rectangle, a circle, a quadrangle, a triangle, or the like.

  By forming the non-low-rigid area 15 as described above, menstrual blood excreted from the excretory part is suitably absorbed, and the area flexibly deformed in the area where the skin surface moves greatly during operation. To do.

[3] Third Embodiment An absorbent article 1B according to the third embodiment will be described with reference to FIGS. As shown in FIG.11 and FIG.12, the absorbent article 1B in 3rd Embodiment is an absorbent article which has arrange | positioned the rectangular auxiliary absorber 130 on the absorber 10 in 1st Embodiment. Below, the absorbent article 1B is demonstrated centering on the point which is different from the absorbent article 1 in 1st Embodiment.

  As shown in FIGS. 11 and 12, in the absorbent article 1 </ b> B, the auxiliary absorbent body 130 is disposed on the top sheet 2 side of the absorbent body 10. Specifically, a rectangular auxiliary absorbent body 130 that is long in the longitudinal direction is disposed in the center area of the surface of the absorbent body 10 having the opening 13 formed on the entire surface on the surface sheet 2 side.

  The auxiliary absorbent body 130 has the same structure as the absorbent body 10 and is disposed at substantially the same position in the plane direction as the non-low-rigidity region 15 of the second embodiment. Further, the length in the longitudinal direction and the width direction of the auxiliary absorbent body 130 is the same as that of the non-low-rigidity region 15 in the second embodiment.

  The auxiliary absorbent body 130 is joined to the absorbent body 10 while being placed on the surface of the absorbent body 10 on the surface sheet 2 side. The auxiliary absorbent body 130 and the absorbent body 10 can be joined by embossing with an adhesive or a heated embossing roll and thermally fusing each other.

Here, as an adhesive, for example, a pressure sensitive adhesive or heat sensitive adhesive mainly composed of rubbers such as SEBS, SBS, SIS or the like, or olefins such as linear low density polyethylene, or polyvinyl which is composed of a water-soluble polymer. Examples thereof include water-sensitive adhesives such as alcohol, carboxymethyl cellulose, gelatin and the like, and polyvinyl acetate and sodium polyacrylate made of a water-swellable polymer. Examples of the adhesive coating pattern include spiral coating, control seam coating, coater coating, curtain coater coating, and summit gun coating. The basis weight of the adhesive is 1 to 30 g / m ² , preferably 3 to 10 g / m ² . Moreover, the embossing pattern in embossing can illustrate dot shape, a grid | lattice shape, a linear shape, a wave shape, etc., Although it is not limited to any, A dot-like embossing pattern is preferable in order not to give a foreign material feeling.

[4] Fourth Embodiment With reference to FIG. 13, an absorbent article 1C in the fourth embodiment will be described. As shown in FIG. 13, the absorbent article 1 </ b> C in the fourth embodiment is not the auxiliary absorbent body 130 of the absorbent article 1 </ b> B in the third embodiment, but a laminated body 132 laminated in a state where the pulp is not covered with the covering sheet. It is different in that. Below, 1 C of absorbent articles are demonstrated centering on the point which is different from the absorbent article 1B in 3rd Embodiment.

  As shown in FIG. 13, in the absorbent article 1 </ b> C, pulp that is not covered with the covering sheet is laminated on the top sheet side of the absorbent body 10. Specifically, the pulp is laminated and disposed on the surface of the absorbent body 10 on the surface sheet 2 side, and a part of the pulp enters the opening 13 to form the laminated body 132. A support sheet 133 is disposed on the back sheet 3 side of the laminated body 132, and a cover sheet is disposed on the top sheet 2 side.

  The position at which the stacked body 132 is disposed is substantially the same position in the plane direction as the non-low-rigidity region 15 of the second embodiment, as in the third embodiment. Further, the size of the laminate 132 in the longitudinal direction and the width direction is the same as that of the non-low-rigidity region 15 in the second embodiment.

  Here, the laminated body 132 is the back sheet 3 in the state which has arrange | positioned the support sheet 133 which suppresses the omission of a pulp to the back sheet 3 side (non-skin contact surface side) of the absorber 10 in which the some opening 13 was formed. It can form by laminating | stacking a pulp on the surface sheet 2 side (skin contact surface side) of this absorber 10, attracting | sucking from the side (non-skin contact surface side). Here, in this embodiment, although the laminated body 132 is comprised with a pulp, it is not limited to this, It can select from the absorption material mentioned above suitably, and can use it.

[5] Fifth Embodiment An absorbent article 1D in the fifth embodiment will be described with reference to FIGS. As shown in FIGS. 14 and 15, the absorbent article 1 </ b> D according to the fifth embodiment has a plurality of low weight parts 14. The position, size, and shape of the low weight portion 14 are the same as those of the absorbent article 1 in the first embodiment.

  The low basis weight 14 is an area formed so that the basis weight is smaller than the area around the low basis weight 14. The low basis weight 14 can be formed by reducing the amount of the absorbent material stacked in a predetermined region. Specifically, it can be formed by laminating an absorbent material on a support member having an uneven surface. Thereby, the absorber 10 in which unevenness is formed on one surface is formed. And the area | region in which this recessed part was formed, and was formed so that it might become thin in the thickness direction becomes the low weight part 14. The low basis weight 14 is preferably 0.5 or less with respect to the peripheral basis weight of the low basis weight 14.

  As shown in FIG. 15, the absorber 10 is arranged such that the surface on which the irregularities are formed faces the back sheet 3 side. Accordingly, the low basis weight portion 14 is disposed so as to be dispersed in the planar direction of the absorbent article 1D, and the flat surface of the absorbent body 10 is disposed on the surface sheet 2 side. The top sheet 2 is disposed along a flat surface of the absorbent body 10.

  Here, the shape of the low weight portion 14 changes preferentially over the surrounding area of the low weight portion 14. Specifically, when a force is applied to the absorbent article 1D such that the absorbent article 1D extends in the plane direction, the fibers of the low weight per unit area 14 are preferentially loosened and added in such a manner that the absorbent article 1D contracts in the plane direction. If it is, the low weight 14 is preferentially compressed. Since the absorbent article 1D is formed with a plurality of low-weight parts 14, each low-weight part 14 is deformed as described above, so that it is prevented from being bent inadvertently due to a force being concentrated on one place. it can. In other words, since the absorbent article 1D is deformed following the movement of the body, it is possible to suppress the occurrence of large wrinkles. Thereby, giving a wearer a foreign material feeling can be suppressed.

  Further, in the present embodiment, the low basis weight 14 is formed so as to be dispersed over the entire surface of the absorbent body 10, but is not limited thereto, and is low in a predetermined region like the absorbent article 1 </ b> A of the second embodiment. The basis weight 14 may not be formed.

  Moreover, you may arrange | position the auxiliary | assistant absorber 130 to the surface sheet 2 side of the absorber 10 like the absorbent article 1B of 3rd Embodiment.

[6] Other Embodiments Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be implemented in various other forms.

[6.1] Opening In the above-described embodiment, the opening 13 has been described with respect to the aspect in which both end portions in the longitudinal direction extend to the non-compressed portion 12, but the present invention is not limited to this. You may form so that it may be located in. That is, the length in the longitudinal direction of the opening 13 may be formed to be shorter than the length in the longitudinal direction of the compression portion 11. By forming the opening 13 in this way, the opening 13 can be made difficult to be crushed even when the absorber 10 is deformed. Therefore, the absorber 10 which can maintain an open state even after deform | transforming continuously can be provided. In addition, this absorber is the same as the absorber 10 mentioned above except that the size (length in the longitudinal direction) of the opening 13 (cut 131) is different, and is the same as the method for manufacturing the absorber 10 described above. It can be manufactured by the method.

  In the above-described embodiment, the opening 13 has an elliptical shape that is long in the longitudinal direction. However, the present invention is not limited to this, and the opening 13 may be an elliptical shape that is long in the width direction or an elliptical shape that is inclined by a predetermined angle with respect to the longitudinal direction. It may be a circle or a rectangle. Here, when the absorbent body 10 is used in a state where it is disposed in a predetermined absorbent article, the portion is formed according to the position to be formed so as to be easily deformed according to body grooves or body movements. Alternatively, the shape of the opening 13 may be adjusted. For example, by forming the opening 13 formed in the central portion in the width direction so that the opening area is larger than the opening 13 formed on the side edge in the width direction, the central region in the width direction of the absorber 10 is a peripheral region. It is preferable because it deforms more flexibly and deforms along the central region of the body with large irregularities. Here, the same applies to the low basis weight portion 14.

  Further, for example, by increasing the area of the opening 13 formed behind the labia rather than the opening 13 formed in front of the labia in the body, it corresponds to a portion where the skin surface moves greatly during walking or the like. The area to be made can be flexibly deformed. Here, enlarging the opening area in the predetermined region includes not only increasing the area of the opening 13 itself, but also including arranging the openings 13 so as to be dense with each other. Here, the same applies to the low basis weight portion 14.

  Moreover, in the above-mentioned embodiment, although the opening 13 is formed in the staggered pattern in the plane direction in the absorber 10, it is not limited to this, You may form in a grid | lattice form or at random. Here, the same applies to the low basis weight portion 14.

  In the above-described embodiment, the openings 13 are formed so as not to overlap each other in the longitudinal direction and the width direction. However, the present invention is not limited thereto, and the openings 13 may be alternately formed so as to overlap in the longitudinal direction or the width direction. it can. For example, the opening 13 can be formed so as to overlap 0.5 to 5 mm in the longitudinal direction or the width direction. Here, overlapping in the longitudinal direction or the width direction means that the openings 13 do not overlap but overlap when the opening 13 is projected in the longitudinal direction or the width direction. By forming the opening 13 so as to overlap in the longitudinal direction or the width direction in this way, the stretchability and stretchability of the absorbent body 10 are enhanced, and it is possible to flexibly deform following the movement of the wearer. . Here, the same applies to the low basis weight portion 14.

“6.2” compression unit 11
In the above-described embodiment, the compression unit 11 is formed corresponding to the position where the notch 131 is formed, but is not limited to this, and is formed so as to be continuous in a predetermined direction in consideration of the deviation generated in the cutter roll 800. May be. For example, the compression part 11 can be formed in a rectangular shape continuous in the width direction. In this case, the cuts 131 are formed at predetermined intervals in the width direction, and even if a slight shift occurs in the cutter roll 800, it is possible to suppress the cut 131 from protruding from the compression unit 11 and forming only the non-compression unit 12.

“6.3” Opening Manufacturing Method In the present embodiment, as the embossing means, a first embossing roll 710 having protrusions 711 formed on the surface at predetermined intervals is opposed to the first embossing roll 710 with a predetermined gap. Although the embossing roll 700 which has the 2nd embossing roll 720 arrange | positioned so that the processus | protrusion 721 may be corresponded with the processus | protrusion 711 is used, it is not limited to this. For example, you may use the embossing roll comprised by the 1st embossing roll 710 in which the processus | protrusion 711 is formed in the surface at predetermined intervals, and the flat roll in which the processus | protrusion is not formed in the surface. Here, the positional relationship in the vertical direction between the first embossing roll and the flat roll is not particularly limited.

  In this embodiment, the widening process in the case where the cuts 131 are formed in a staggered manner has been described. For example, the widening process in the case where the cuts 131 are formed in a lattice shape is performed as follows. be able to. That is, the gear teeth 911 are positioned between the predetermined notch 131 and the notch 131 adjacent to the predetermined notch 131, and the gear teeth 921 are positioned on the notch 131 and passed through the gear roll 900 for widening processing. be able to.

  Further, in the above-described embodiment, the notch 131 is widened by the gear roll 900, but the invention is not limited thereto, and the absorbent body 10 in which the notch 131 is formed may be widened by applying tension in the process. Moreover, you may widen by pulling in CD direction with a nip roll or a crown roll.

  Further, in the above-described embodiment, the opening 13 is formed by widening the notch 131. However, the opening 13 is not limited to this, and is formed by providing a region where the absorbent material is not stacked when forming the absorber. Also good. For example, it can be formed by laminating an absorbent material on a support member having an uneven surface. Specifically, an absorbent body in which a plurality of openings are formed is formed by laminating an absorbent material on a support member on which a convex portion higher than the thickness of the absorbent body is formed. Here, the laminated body of the absorbent material in which a plurality of openings are formed is formed by covering with a covering sheet. By forming in this way, since the opening (hole) is not formed in the covering sheet, it is preferable because pulp and polymer absorber (SAP) as an absorbent material do not leak.

[7] Component [7.1] Surface Sheet A nonwoven fabric is used as the surface sheet 2 in the embodiment described above. As fibers constituting this nonwoven fabric, fibers containing a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate, etc., which are fibers made of the resin alone or a core-sheath type, a core-sheath eccentric type, and a side-by-side type composite fiber It can be illustrated. Further, in order to control the wettability of these fibers, hydrophilicity or a water repellent oil agent may be attached to the fiber surface or kneaded. These oils are usually effective in an amount of 0.2 to 1.0% by mass. In consideration of hydrophilicity with body fluids, cellulose-based liquid hydrophilic fibers such as pulp, chemical pulp, rayon, acetate, and natural cotton may be included. The fiber is preferably 1.1 to 6.6 dtex, and the basis weight of the nonwoven fabric is preferably adjusted in the range of 15 to 120 g / m ² . The nonwoven fabric as the surface sheet 2 can be exemplified by a nonwoven fabric produced by hydroentangling, spunbonding, or the like, using these fibers alone or in combination.

  Moreover, as another form in the surface sheet 2, the sheet-like material of the structure which permeate | transmits liquids, such as a woven fabric and a perforated plastic sheet, can be illustrated, for example. Here, as the perforated plastic sheet, a perforated sheet made of a thermoplastic resin such as PE, PP, or PET, a porous foam material, or the like can be used. Further, as the porous plastic sheet, a porous plastic sheet in which an inorganic filler made of titanium oxide, calcium carbonate, or the like is mixed in a range of 0.5 to 10% by mass as necessary may be used. . In addition, a perforated film obtained by perforating, heat embossing, machining or the like may be used for a film made of a thermoplastic resin. This perforated film may be bonded to a non-woven fabric and used as a composite sheet.

  It is preferable that the surface sheet 2 has extensibility. The entire surface sheet 2 may be provided with extensibility or may be provided with extensibility partially. For example, the stretchability may be imparted to a region in the center in the width direction (a region that comes into contact with the buttocks) on the rear side in the longitudinal direction, which is a particularly easily stretched region. In order to give the surface sheet 2 extensibility, for example, a plurality of cuts extending in the longitudinal direction may be formed in the surface sheet 2 in the width direction, or a process for relaxing the binding force between the fibers may be added. Examples of a method for easing the binding force between the fibers of the fiber assembly constituting the top sheet 2 include a method for tendering the top sheet 2 and a method for performing a wavy embossing process. Further, the top sheet 2 may be stretchable by folding it so that it can be creased or by performing corrugation processing in which grooves are formed.

[7.2] Back Sheet As the back sheet 3, for example, polyethylene, polypropylene, polyethylene terephthalate having a thickness of 15 to 60 μm, polyvinyl alcohol, polylactic acid, polybutyl succinate, or nonwoven fabric, paper, and a laminate material thereof are used. It can be illustrated. Moreover, the air permeable film obtained by being filled with an inorganic filler and performing a extending | stretching process may be sufficient. Specifically, examples of the film and non-woven fabric that are mainly composed of low-density polyethylene resin and adjusted in the range of 15 to 30 g / m ² per unit area include spunbond non-woven fabric, point bond non-woven fabric, and through-air non-woven fabric. Examples of these are water-repellent treatments.

  The back sheet 3 preferably has extensibility. For example, extensibility may be imparted by corrugation processing in which grooves are partially or entirely formed. Further, as another method for imparting extensibility, a method of making a cut, cutting out in a circular shape, or forming an opening may be used, but corrugating is preferable from the viewpoint of liquid impermeability in the back sheet 3. .

  Here, a cushion sheet, a diffusion sheet, or the like may be disposed between the top sheet 2 and the absorbent body 10 described above.

It is a top view of absorbent article 1 in a 1st embodiment of the present invention. 1 is a cross-sectional view of an absorbent article 1. FIG. It is an enlarged view of the absorber 10 in the area | region a in FIG. It is the elements on larger scale of the absorbent article 1 in FIG. (A) It is a figure explaining the process which forms the compression part 11 in absorber 10 'with the embossing roll 700. FIG. (B) It is a top view of absorber 10 'in which the compression part 11 was formed. (C) It is an enlarged view of the compression part 11 formed. (A) It is a figure explaining the process which forms the cut 131 in the compression part 11 in absorber 10 'with the cutter roll 800. FIG. (B) It is a top view of absorber 10 'by which the cut 131 was formed in the compression part 11. FIG. (C) It is an enlarged view of the notch 131 formed in the compression part 11. FIG. (A) It is a figure explaining the process which widens the notch 131 formed in absorber 10 'with the gear roll 900. FIG. (B) It is a top view of absorber 10 'with which notch 131 was expanded. (C) It is an enlarged view of the widened cut 131. FIG. It is a top view of 1 A of absorbent articles in 2nd Embodiment of this invention. It is BB sectional drawing of 1 A of absorbent articles. It is CC sectional drawing of 1 A of absorbent articles. It is a top view of absorbent article 1B in 3rd Embodiment of this invention. It is DD sectional drawing of the absorbent article 1B. It is sectional drawing of 1 C of absorbent articles in 4th Embodiment of this invention. It is a top view of absorbent article 1D in 5th Embodiment of this invention. It is EE sectional drawing in absorbent article 1D.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Back sheet 10 Absorber 13 Opening 14 Low weight part

Claims (12)

Having a width direction and a longitudinal direction perpendicular to the width direction,
An absorbent article comprising at least a part of a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent disposed between the top sheet and the back sheet. And
The absorbent body has a plurality of low-rigidity portions having lower rigidity than the surrounding area,
The buckling stiffness value of the absorber is
(1) The load at the time of 5 mm compression is 0.8 N or less, and
(2) An absorbent article in which a value obtained by subtracting a load at the time of 5 mm compression from the maximum load is 0.2 N or less. The buckling stiffness value of the absorbent article is
(1) The load at the time of 5 mm compression is 1.6 N or less, and
(2) The absorbent article according to claim 1, wherein a value obtained by subtracting the load at the time of 5 mm compression from the maximum load is 0.4 N or less. The absorber has a non-low rigidity region where the low rigidity portion is not formed,
The non-low rigidity region has a length in the longitudinal direction of 40 mm or more, a length in the width direction of 10 mm or more, and 30 mm or more from the longitudinal rear edge arranged on the rear side of the body when worn. The absorptive article according to claim 1 or 2 formed in the position spaced apart to the front side.   The absorption according to any one of claims 1 to 3, wherein each of the plurality of low-rigidity portions has a length in the longitudinal direction of 0.5 mm to 15 mm and a length in the width direction of 0.5 to 15 mm. Sex goods.   The absorbent article according to any one of claims 1 to 4, wherein each of the plurality of low-rigidity portions is an opening. In the absorber, a plurality of high rigidity regions are formed,
The absorbent article according to claim 5, wherein each of the plurality of openings is formed in each of the plurality of high-rigidity regions.   The absorbent article according to claim 6, wherein each of the plurality of openings is formed by forming a cut in each of the plurality of high-rigidity regions and widening the cut. The plurality of openings are formed continuously in the longitudinal direction and formed in a plurality of rows extending in the longitudinal direction,
The absorptive article according to any one of claims 5 to 7 in which a forming line extending in the longitudinal direction is formed between the plurality of rows.   The absorbent article according to any one of claims 1 to 4, wherein each of the plurality of low-rigidity parts is a low-weight part having a lower basis weight than a surrounding region.   The absorbent article according to claim 9, wherein the basis weight in the plurality of low basis weight portions is 0.5 or less with respect to the basis weight in the surrounding area.   The absorbent article according to any one of claims 1 to 4, wherein an auxiliary absorbent is further disposed between the absorbent and the topsheet. Between the absorbent body and the surface sheet, a laminated body in which an absorbent material is laminated is disposed,
The absorbent article according to any one of claims 5 to 8, wherein a part of the absorbent material constituting the laminate is disposed so as to enter a part of the plurality of openings.

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