Hereinafter, one embodiment of the present invention will be described by way of an example of a panty type disposable diaper (training panty), but it goes without saying that the present invention can also be applied to a tape type disposable diaper or a pad type absorbent article I will not.
1 to 9 show an example of a panty type disposable diaper. In the drawings, the term "front-rear direction" refers to a direction connecting the bather side (front side) and the rear side (rear side), the term "width direction" refers to a direction (lateral direction) Refers to the direction in which the diaper is worn, that is, in the direction perpendicular to the waist-opening direction in a state in which the diaper is folded in two at the groin portion in such a manner that both side portions of the front and back portions of the diaper are overlapped, And the direction of connecting the groin portion.
This disposable diaper of the panty type is also provided with a bodyside outer sheet 12F covering the bather side of the wearer's waist and a back side outer sheet 12B covering the back side and both sides in the width direction of the bather side outer sheet 12F and both side edges in the width direction of the back side outer sheet 12B, So that the waist portion 100 is formed by fusion bonding by heat seals, ultrasonic welding or the like throughout the entire upper and lower direction. Reference numeral 12A denotes each bonded portion, and a plurality of these bonded portions 12A constitute a side seal portion. As shown in the figure, when the back side outer sheet 12B is extended downward from the welded portion 12A, processing such as a heat seal is integrally performed in the vertical direction range up to this portion, 14 can be formed. The second elongated elastic stretchable member 16 of the rearward extending portion 14 to be described later can be prevented from being pulled out by forming the directed welded portion 12E. In this case, it is general that the welded portion 12A is a set of small welded portions and the welded portion ratio of the welded portion 12A is low, considering that the side portion is easily torn. However, in the directed welded portion 12E, It is not necessary to consider that the second elongate-up elastic stretchable member 16 is welded and fixed reliably by increasing the deposition area ratio as compared with the welded portion 12A. It is also possible to melt the edge portion of the hip cover portion 14C in the curved line so as to prevent the second elongate-elastic elastic stretchable member 16 of the hip cover portion 14C from being pulled.
The front end of the inner body 200 is connected to the inner surface of the center portion in the width direction of the outer side sheet 12F in the waist portion 100 by means of a hot melt adhesive or the like and the rear end portion of the inner body 200 is bonded to the inner surface in the widthwise central portion of the back side outer sheet 12B And the double skin outer sheet 12F and the outer skin sheet 12B are not connected to each other at the groin side but are separated from each other. The distance Y may be about 150 to 250 mm. Although not shown, a configuration in which the double-faced outer sheet 12F and the back-up outer sheet 12B are continuously covered in the groin portion, that is, the bust-side outer sheet 12B and the back outer sheet 12B are continuously covered with a single outer sheet.
7 and 8, the upper opening (opening) of the waist portion 100 becomes the waist opening WO passing the body of the wearer, and the lower side of the waist portion 100 on both sides in the width direction of the inner body 200, A portion surrounded by side edges of the leg opening LO passes through the legs. In a state in which each welded portion 12A is peeled and developed, an hourglass shape is formed as shown in Fig. The inner body 200 extends in such a manner that the inner body 200 passes through the groin portion to cover the biceps, receives the excrement and absorbs the liquid, and the waist portion 100 is a portion that supports the inner body 200 to the wearer.
(Outer sheet)
As shown in FIGS. 4 and 5, the double-side external sheet 12F and the double-side external sheet 12B are made by attaching two sheet-like materials 12 and 12, and the inner sheet- The outer sheet-like material 12 positioned on the outer side is folded inwardly around the waist side edge of the inner sheet-like material 12, and this folded portion 12r is formed so as to cover up to the waste side end portion of the inner body 200 And is fixed to the opposing surface with a hot-melt adhesive or the like. The sheet-like material 12 is not particularly limited as long as it can be bonded by welding, but it is preferably a nonwoven fabric. If it is a nonwoven fabric, what the raw fiber is is not particularly limited. For example, synthetic fibers such as olefins, polyesters and polyamides such as polyethylene and polypropylene, regenerated fibers such as rayon and cupra, natural fibers such as cotton and the like, and mixtures containing two or more of them Fibers, composite fibers, and the like. The nonwoven fabric may be produced by any process. Examples of the processing method include widely known methods such as a spun lace method, a spun bond method, a thermal bond method, a melt blunting method, a needle punch method, an air through method, a point bond method and the like. In the case of using a nonwoven fabric, its weighing amount is preferably about 10 to 30 g / m 2 .
In addition, in the bodyside outer sheet 12F and the back sheet 12B, elongate elastic stretchable members 15 to 19 such as elastic strands are provided between the both sheet materials 12 and 12 at predetermined elongation ratios in order to improve fitability to the waist . As the elongate and elastic elastic members 15 to 18, 19T and 19U, it is possible to use synthetic rubber or natural rubber. Hot melt bonding, heat sealing or ultrasonic bonding can be used for attaching the two sheet-like materials 12, 12 of the outer sheets 12F, 12B, or for fixing the elongate elastic stretchable members 15 to 19 sandwiched therebetween. Strongly fixing the front surfaces of the outer sheets 12F and 12B is undesirable because it interferes with air permeability of the sheets. It is preferable that the elongate elastic stretchable members 15 to 19 are strongly adhered to each other and the other portions are not adhered or weakly adhered.
More specifically, the back side outer sheet 12B has a back side body portion 13 occupying a vertical range such as the side seal portion by the bonded portion 12A group, and a side row extending portion 14 directed toward the lower side of the back side body portion 13. [ The dorsal extended portion 14 includes a widthwise central portion 14M overlapping the inner body 200 and a hip cover portion 14C directed to both sides thereof.
In the illustrated example, the upper end of the dorsal extended portion 14 is directed to the lower side of the dorsal main body portion 13 with the same width as that of the dorsal main body portion 13, The closer the width is, the narrower the width. A portion which is equal in width to the diving main body 13 may be omitted. With this configuration, the outer rim 14e in the width direction of the hip cover portion 14C becomes linear or curved so as to be closer to the internal body 200 as it gets closer to the groin, so that the hip portion is easily covered.
6, the width direction length 14x of the hip cover portion 14C (the maximum distance in the width direction of the side edge of the inner body 200 and the outer edge 14e in the width direction of the hip cover portion 14C, ) Is 80 to 160 mm, and the length 14y of the hip cover portion 14C in the up-and-down direction (direction of length) is 30 to 80 mm. If the area of the rectangle defined by the widest portion in the width direction of the dorsal runner 14 and the widest portion in the up and down direction is S, the area of the dorsal runner 14 is 20 to 80%, particularly 40 to 60% , It is preferable that the hips are excellent in appearance and fit.
The dorsal main body portion 13 can be conceptually divided into an upper end portion (waist portion) W in a vertical direction and a lower side portion U lower than the upper end portion. The range is different depending on the size of the product, And the length of the lower portion U in the vertical direction may be 35 to 220 mm.
Between the inner surface of the inner sheet material 12 and the outer surface of the folded portion 12r of the outer sheet material on the upper end portion (waist portion) W of the diving main body portion 13, Elastic stretching members 17 are fixed in a state of being stretched along the width direction at a predetermined elongation at intervals in the vertical direction. One or more of the elastic stretchable members 17 of the rear waist portion may be overlapped with the inner body 200 and may have a width overlapping the inner body 200 But may be disposed on both sides in the width direction except for the direction central portion. As this elastic stretching member of dorsal waist 17, the diameter 155 ~ 1880dtex, especially 470 ~ 1240dtex degree of the rubber band (in the case of synthetic rubber. For natural rubber, the cross-sectional area 0.05 ~ 1.5mm 2, particularly 0.1 ~ 1.0mm 2 or so), Preferably about 3 to about 22 in an interval of 4 to 12 mm and an extension ratio of about 150 to 400%, particularly about 220 to 320%. The elastic stretchable members 17 of the rear waist portion need not all have the same thickness and stretch ratio. For example, the elastic stretchable member may have different thicknesses and elongation ratios at the upper and lower portions of the rear waist portion.
In the lower portion U of the dorsal main body portion 13, the outer side surface of the inner sheet-like material 12 and the inner side surface of the outer sheet-like material 12, except for the widthwise central portion overlapping the inner surface body 200, And a plurality of first elongate elastic stretchable members 15 are fixed in a state of being elongated along the width direction at a predetermined elongation at intervals in the up and down direction so as to be continuous over the entire width direction at the respective portions on both sides in the width direction .
As the three superior elastic stretching member 15 of the first, thickness 155 ~ 1880dtex, in particular approximately 470 ~ 1240dtex rubber bands (in the case of synthetic rubber. For natural rubber, the cross-sectional area 0.05 ~ 1.5mm 2, particularly 0.1 ~ 1.0mm 2 degree) , Preferably about 5 to 30 at an interval of 1 to 15 mm, particularly 3 to 8 mm, and an extension ratio of 200 to 350%, especially about 240 to 300%.
In the dorsal runner portion 14, between the outer surface of the inner sheet-like material 12 and the inner surface of the outer sheet-like material 12, A plurality of second elongate-elastic elastic members 16 are fixed in a state elongated along the width direction at a predetermined elongation at intervals in the up-and-down direction so as to be continuous over the whole direction (at least over the entire hip cover portion 14C) .
The rubber of the second three superior elastic stretching members as 16, weight 155 ~ 1880dtex, especially 470 ~ 1240dtex degree (in the case of synthetic rubber. For natural rubber, the cross-sectional area 0.05 ~ 1.5mm 2, particularly 0.1 ~ 1.0mm 2 or so), It is preferable to fix 2 to 10 pieces at an interval of 5 to 40 mm, particularly 5 to 20 mm, and an extension ratio of 150 to 300%, especially 180 to 260%.
On the other hand, the bather-side outer sheet 12F is basically the same as the bather side body portion (the portion occupying the vertical direction range as the side seal portion by the bonded portion 12A group) basically with the back side body portion 13 of the back side outer sheet 12B, Like shape and does not have the same bending direction portion 14 as the back side facing sheet 12B.
That is, among the upper end portion (waist portion) W and the lower portion U of the double-side external sheet (bodyside body portion) 12F, the inner side surface of the inner sheet-like material 12 at the upper end portion W and the inner surface of the folded portion 12r of the outer sheet- Side elastic members 18 are stretched along the width direction at a predetermined elongation at intervals in the vertical direction so as to be continuous throughout the entire width direction. The elastic stretchable member 18 of the abdominal side waist portion is preferably similar to the elastic stretchable member 17 of the rear waist portion so as to be similar in number, thickness, elongation, spacing, and up-and-down orientation, The difference in the number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, 10 mm or less, preferably 5 mm or less.
Further, between the outer surface of the inner sheet-like material 12 and the inner surface of the outer sheet-like material 12 in the lower portion U of the double-side outer sheet 12F (bodyside body portion), a widthwise middle portion A plurality of third elongate elastic members 19 are stretched along the width direction at a predetermined elongation at intervals in the up-and-down direction so as to be continuous over the entire width in the widthwise direction, . The upper and lower directional arrangement range of the third elongate-long-and-short-elastic elastic member 19 may be a part of the lower portion, but is preferably substantially entire (a range in which the expansion and contraction force acts as a whole).
As the third elongate-top elastic stretchable member 19, it is preferable that the number, thickness, elongation, spacing, and up-and-down arrangement of the first elongate elastic stretchable member 15 be similar to each other, but they can be different from each other The difference in the number is 10 or less, preferably 5 or less, the difference in thickness is 1880 dtex or less, preferably 470 dtex or less, the difference in elongation is 100% or less, preferably 40% or less, Or less, preferably 5 mm or less.
Side outer sheet 12F is a portion occupying the upper and lower range of the bonded portion 12A. Like the back side, the bifurcated outer sheet 12F has a bifurcated main body portion occupying the same vertical range as the bonded portion 12A, Side direction leading portion that is directed toward the rear side. Thus, the shape of the leg periphery of the double-side outer sheet 12F can be shaped to fit along the inguinal region. In this case, it is preferable that the area of the bather-side extending portion is 10 to 80% of the area of the backward extending portion, more preferably 20 to 50%. If the bather-side extension portion is excessively large, it may be detrimental to fitability, which is not preferable.
On the other hand, as shown in the figure, if the first, second, and third elastic thin elastic members 15, 16, and 19 are located on both sides in the width direction except for the widthwise central portion overlapping with the inner body 200, It is preferable that the inner sheet 200 and the outer sheets 12F and 12B are not peeled off easily. However, in this embodiment, in addition to the form in which the elastic stretchable members are present only on both sides in the width direction, The present invention includes a configuration in which the elastic stretchable member is cut at the widthwise central portion overlapping with the inner body 200 so that the elastic stretchable member does not act (practically, there is no elastic stretchable member). Then, a part or all of the first, second and third elongate elastic members 15, 16 and 19 are inserted into the inner body 200 so as to exert an elastic force across the entire width direction of the dorsal main body part 13 and the dorsal extended part 14 It is also possible to extend from one side in the width direction to the other side.
(Interior)
The inner body 200 can adopt any shape, but is rectangular in the illustrated example. As shown in Fig. 3, the inner body 200 is provided with a topsheet 30 serving as a body side, a liquid-pervious sheet 11, and an absorbent element 50 interposed therebetween. Permeable sheet 11 may be fixed on the back surface of the liquid-pervious sheet 11 so as to cover the entire back surface of the inner body 200 or to cover the whole portion exposed between the double-side external sheet 12F and the back external sheet 12B. Further, an intermediate sheet (secondary sheet) for rapidly transferring the liquid permeated through the surface sheet 30 to the absorbent element 50 can be formed between the surface sheet 30 and the absorbent element 50, but heat transfer to the skin is prevented Between the topsheet 30 and the absorbent element 50, at least the portion overlapped with the pocket portion 57 to be described later, preferably the entirety, is not provided. In addition, barrier cuffs 60 and 61 standing up toward the body can be formed on both sides of the inner body 200 to prevent excretion from leaking to both sides of the inner body 200. Although not shown, the respective constituent members of the inner body 200 can be appropriately mutually fixed by applying, for example, a bead or a spiral, such as a hot-melt adhesive. Further, the inner body 200 can be made detachable with respect to the outer sheets 12F and 12B by using a mechanical fastener or a pressure-sensitive adhesive.
(Surface sheet)
The topsheet 30 has a property of transmitting liquid, and examples thereof include nonwoven fabrics of porous or nonporous, porous plastic sheets, and the like. Of these, the nonwoven fabric does not specifically specify what the raw fiber is. For example, synthetic fibers such as olefins, polyesters and polyamides such as polyethylene and polypropylene, regenerated fibers such as rayon and cupra, natural fibers such as cotton and the like, and mixtures containing two or more of them Fibers, composite fibers, and the like. The nonwoven fabric may be produced by any process. Examples of the processing method include widely known methods such as a spun lace method, a spun bond method, an SMS method, a thermal bond method, a melt blunting method, a needle punch method, an air through method and a point bond method. Particularly, in order to easily detect the temperature change from the surface side, the nonwoven fabric processed by the spunbond method or the SMS method is suitable in that the balance between thinness and strength is excellent, and the nonwoven fabric processed by the air- (Low basis weight) is suitable because it is quick in absorption and also feels smooth and smooth.
The topsheet 30 may be a single sheet or a laminated sheet formed by pasting two or more sheets. Similarly, with respect to the planar direction, the topsheet 30 may be a single sheet or two or more sheets attached thereto.
When the topsheet 30 is made of a nonwoven fabric and has a thickness of about 0.1 to 3 mm, particularly 0.5 mm or less, and an adhesion amount of about 10 to 40 g / m 2 , particularly about 25 g / m 2 or less, It is preferable because it has excellent heat transfer properties.
When the barrier cuffs 60 and 61 are made, both side portions of the topsheet 30 are rotated to the other side of the absorbing element 50 through the gap between the liquid-pervious sheet 11 and the barrier cuffs 60 and 61, It is preferable to bond the transparent sheet 11 and the barrier cuffs 60 and 61 with a hot-melt adhesive or the like. Thereby, it is possible to obtain an effect that the rigidity of both side portions of the inner body 200 is improved.
(Second sheet)
As described above, the secondary sheet 44 (see Fig. 20 (c)), which has a higher liquid permeation rate than the topsheet 30, can be made to rapidly transfer the liquid permeated through the topsheet 30 to the absorber. This second sheet 44 not only moves the liquid quickly to the absorber to improve the absorption performance by the absorber but also prevents the absorbed liquid from being " backed " from the absorber, have. The second sheet 44 may be omitted.
As the second sheet 44, a material such as the topsheet 30, spun lace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond or crepe paper can be exemplified. In particular, the air-through nonwoven fabric is preferable because it is bulky. As the air-through nonwoven fabric, it is preferable to use a core-sheath structure conjugate fiber. In this case, polypropylene (PP) may be used as the resin used for the padding, but polyester (PET) having high rigidity is more preferable. And coating weight is 20 ~ 80g / m 2 is preferable, 25 ~ 60g / m 2 is more preferred. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to increase the volume of the nonwoven fabric, it is also preferable to use eccentric fibers, hollow fibers and eccentric hollow fibers which are not in the center of the core as mixed fibers of all or a part of the raw fibers.
The second sheet 44 may be formed so as to extend over the full width of the absorbent body 56 in addition to being disposed at a center shorter than the width of the absorbent body 56. The length of the secondary sheet 44 in one direction of the oil may be the same as the length of the absorber 56 or may be in the range of a short length centered on the region containing the liquid.
(Liquid-pervious sheet)
The material of the liquid-pervious sheet 11 is not particularly limited, but for example, olefin resin such as polyethylene or polypropylene, laminate nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, waterproof film, And a nonwoven fabric (in this case, a liquid-pervious sheet is constituted by a waterproof film and a nonwoven fabric). Of course, in addition to the above, it is also possible to exemplify a liquid-permeable material having moisture permeability, which has been widely used in recent years from the standpoint of prevention of retraction. Examples of the sheet having a liquid-impervious and moisture-permeable material include, for example, kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, molding the sheet, Sheet can be exemplified. Further, by using a nonwoven fabric using micro denier fibers, a waterproof film is not used by a method of strengthening leakage resistance by applying a heat or a pressure to reduce the gap of the fiber and coating a super absorbent resin or a hydrophobic resin or a water repellent Permeable sheet 11 can also be used as the liquid-pervious sheet 11.
Permeable sheet 11 is preferably extended to both side portions of the side surface of the topsheet 30 of the absorbent element 50 by turning both sides of the absorbent element 50 in order to enhance the fluid tightness. Thereby, it is possible to obtain an effect that both side rigidity of the inner body 200 is improved. The width of this serial part is suitably about 5 ~ 20mm on each side.
Further, the inner or outer surface of the liquid-pervious sheet 11 may be designed by printing or coloring. Permeable sheet 11 may be provided with a design different from that of the groin portion external sheet 12M by using printing or coloring. Further, the exudate indicator 80 whose color changes due to contact with moisture can be formed inside the liquid-pervious sheet 11. Preferably, the excretion indicator 80 is provided between the liquid-pervious sheet 11 and the absorbent body 56. It is preferable that the excretion indicator 80 is provided over 30% or more, particularly 60% or more of the total length of the absorbent body 56. At least the widthwise center of the absorbent body 56 Therefore, it is desirable to make it. When the absorber 56 is wrapped by the wrapping sheet 58 to be described later, the exudation indicator 80 may be formed either on the absorbent body 56 side of the wrapping sheet 58 or on the liquid-pervious sheet 11 side. The other members making up the exiting indicator 80 may be disposed between the liquid-pervious sheet 11 and the absorber 56. If the excretion indicator 80 is made to overlap with the pocket portion 57 of the absorbent body 56 to be described later, it is preferable that a small amount of body fluid is discolored well. In this case, it is preferable that 30% or more, particularly 50% or more of the excretion indicator 80 overlap with the pocket portion 57, and the pocket portion 57 is made to penetrate the absorber 56 in the up and down direction ) desirable.
(Barrier cuff)
The barrier cuffs 60 and 61 are belt-like members extending in the entire front-rear direction along both side portions of the inner body 200. The barrier cuffs 60 and 61 cut off the yoga and the thin side moving along the upper side of the topsheet 30, It is made to prevent.
In this embodiment, as shown in Figs. 3 and 4, the barrier cuffs 60 and 61 are formed on the left and right sides of the inner body 200, respectively. The inner barrier cuffs 61 rise obliquely toward the center in the width direction from the side of the inner body 200 and the outer barrier cuffs 60 are arranged on the outer side in the width direction of the inner barrier cuff 61 The base portion is raised obliquely toward the center in the width direction and the portion on the tip side of the middle portion is rising obliquely toward the outside in the width direction.
More specifically, the inner barrier cuff 61 folds the band-shaped barrier sheet 62 having the same length as the front-back direction length of the inner body 200 in the width direction and overlaps the barrier sheet 62 in the width direction, , And a plurality of elongate elastic members (63) stretched along one direction of the oil and spaced apart in the width direction. The elongate elastic stretchable member 63 is not fixed at the front and rear ends in contrast to the barrier sheet 62, and is fixed so that the barrier cuff extends and retracts in the front and rear portions in the middle portion. As the barrier sheet 62, a nonwoven fabric excellent in flexibility, uniformity and hiding properties such as spun bond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.) and melt blown nonwoven fabric is subjected to water repellency treatment And it is preferable that the fiber adhesion amount is 10 to 30 g / m 2 or so. As the elongate elastic stretchable member 63, an elastic band or the like can be used. When a spandex rubber is used, the thickness is preferably 420 to 1120 dtex, and more preferably 620 to 940 dtex. The elongation percentage at the time of fixing is preferably 150 to 350%, and more preferably 200 to 300%. Although not shown, a waterproof film may be interposed between barrier sheets which are folded in two.
It is preferable to dispose one or two elastic elongate and contractible members 63 at the tip end of the inner barrier cuff 61 and one or two elastically stretchable and contractible members 63 at the middle portion between the tip end and the proximal end. When the elongate elastic stretchable member 63 is present in the middle portion, it tends to touch the skin with a curved surface in a range extending from the intermediate portion to the distal end portion as a point. The arrangement position of the elongate elastic flexible member 63 in the middle portion is preferably in the range of 30 to 70% of the height of the inner barrier cuff 61 (length in the width direction of the projecting portion). In the infant diaper, the height of the inner barrier cuff 61 is preferably about 15 to 35 mm, so that the arrangement range of the elongate elastic stretchable member 63 is preferably 5 to 25 mm from the tip end to the base end, more preferably 12 to 18 mm . When the elongate elastic stretchable members 63 are arranged in parallel at the tip end and / or the middle portion of the inner barrier cuff 61, the arrangement interval 61d is preferably 2 to 10 mm, more preferably 2 to 6 mm.
An end portion of the inner barrier cuff 61 opposite to the folded portion in the width direction is an attachment portion (inner attachment portion) 65 fixed to the back surface of the side edge portion of the inner body 200. The portion other than the attachment portion 65 is an attachment portion (Corresponding to the folded portion side and corresponding to the inwardly projecting portion) of the projecting portion 66. The front and rear end portions of the projecting portion 66 are fixed to the surface of the surface sheet 30 by the hot melt adhesive agent or heat seal 67 So that the longitudinally intermediate portion is a non-fixed free portion (innermost free portion), and the elongate elastic stretchable member 63 is fixed in the elongated state along the forward and backward directions.
The outer barrier cuff 60 has the same structure as the inner barrier cuff 61 in its basic structure, but its attachment portion (outer attachment portion) 68 is located at the center of the inner barrier cuff 61 in the width direction (Outer projecting portion) 69 of the inner barrier cuff 61 through the side portion of the inner body 200 in the attaching portion 68 and the inner barrel cuff 61 in the inner barrier cuff 61 on the side of the inner projecting portion 66 A base portion fixed to the front and rear surfaces of the inner projecting portion 66 in the forward and rearward directions while extending to the front and back surfaces of both ends in the forward and backward directions and a distal end portion fixed to the base portion by folding outward in the width direction The arrangement and the number of the long-and-upper elastic elastic members 63 differ.
However, also with respect to the inner barrier cuff 61, the tip end portion of the inner projected portion is folded outward in the width direction, specifically, the half of the height of the inner barrier cuff 61 (the width direction length of the projected portion) 3 or less, the distal end portion may be folded outward in the width direction and fixed to the base portion like the outer barrier cuff 61.
The number of elongate elastic members 63 provided in the free portion (outer free portion) of the outer barrier cuff 60 is preferably 2 to 6, more preferably 3 to 5. The arrangement interval 60d is 3 to 10 mm. With this configuration, the skin tends to touch the skin in a range in which the elongate elastic stretchable member 63 is arranged. The elongate elastic stretchable member 63 may be disposed not only at the distal end but also at the base. The thickness and extension ratio of the elongate elastic elastic member 63 disposed in the outer barrier cuff 60 are the same as or similar to those of the inner barrier cuff 61, but the thickness is the same as or thicker than the inner barrier cuff 61 and the elongation is equal to the inner barrier cuff 61 , Or lower.
The length L6 of the front and rear fixing portions 67 of the projecting portions 66 and 69 is preferably equal to or shorter than that of the outer barrier cuff 60. In the barrier cuffs 60 and 61, It is preferable that the inner barrier cuffs 61 are formed to be equal to or longer than the outer barrier cuffs 60 in the longitudinal direction fixed length of the member 63. [ The boundary between the attachment portion 65 and the protruding portion 66 may be the same between the outer barrier cuff 60 and the inner barrier cuff 61 but it is preferable that the boundary of the outer barrier cuff 60 is spaced toward the center in the width direction than the boundary of the inner barrier cuff 61 , And the distance therebetween is preferably within 10 mm.
It is preferable to form a line-like base fixing portion by a hot-melt adhesive or a heat seal on the side edge portions of the projecting portions 66, 69 of the attachment portions 68, 65 of the outer barrier cuff 60 and the inner barrier cuff 61. Further, the other fixing portion can be fixed in an appropriate pattern by using a hot-melt adhesive or the like. It is preferable that the base fixed portion on the line is located near the side of the front surface side of the inner body 200 (specifically, at a position of 0 to 5 mm, preferably 0 to 3 mm in the width direction at the side edge) or the back side. In this case, since the barrier cuffs are folded and fixed to the front surface side only at both ends in the forward and backward directions, in the crotch portion where the restriction to the center in the width direction by the front-back fixing portion 67 does not sufficiently act, the outer barrier cuff 60 and the inner barrier Both of the cuffs 61 stand up toward the outside in the width direction and the pockets formed by the inner barrier cuffs 61 are widened. When the line-shaped base fixed portion is located beyond 5 mm in the width direction from the side surface on the front surface side, the barrier cuff stands up toward the center in the width direction and the pocket formed by the inner barrier cuff 61 becomes narrow in the groin portion. not. In the case of being located on the back side, the position of 0 to 20 mm is appropriate from the side edge of the inner body 200, but it may be located beyond 20 mm.
An object to be fixed to the attachment portions 68 and 65 of the outer and inner barrier cuffs 60 and 61 can be an appropriate member such as the topsheet 30, the liquid-pervious sheet 11, and the absorbent element 50 in the inner body 200, The other barrier cuff may be fixed to the inner body 200 through one barrier cuff.
In the thus configured outer and inner barrier cuffs 60 and 61, the contracting force of the elongate elastic stretchable member 63 acts to bring both ends in the forward and backward directions closer to each other, while the forward and backward end portions of the protruding portions 66 and 69 are fixed so as not to stand up. Since the free portion is an unfixed free portion therebetween, only the free portion stands up so as to touch the body side as shown in Fig. Particularly, when the attachment portions 68 and 65 are located on the back side of the inner body 200, since the outer and inner barrier cuffs 60 and 61 rise as the crotch portion and its vicinity open outward in the width direction, 61 are brought into contact with the periphery of the legs to improve the fit performance. On the other hand, at the front and back sides (abdomen and back) of the groin portion, the outer and inner barrier cuffs 60 and 61 are regulated not to open outward in the width direction by the front and rear fixing parts 67, Since the lower half of the barrier cuff 60 also stands up, it is surely prevented from being raised from both sides of the inner body 200 in the abdomen and the abdomen. Since the front and rear fixing parts 67 of the protruding parts 66 of the inner barrier cuffs 61 are not folded and the front and back fixing parts 67 of the protruding parts 68 of the outer barrier cuffs 60 are folded outwardly, 60 and 61 are maintained so that the outer and inner barrier cuffs 60 and 61 securely rise up at wide intervals and fit to the periphery of the legs respectively, .
7, the rising height of the inner barrier cuffs 61 (the width direction length of the protruding portion 66 in the expanded state) W5 (the length in the widthwise direction of the protruding portion 66 in the expanded state) can be appropriately determined, Is preferably 10 to 50 mm, more preferably 15 to 35 mm, and the standing height W6 of the outer barrier cuff 60 (the width direction length of the projecting portion 69 in the expanded state) is preferably 15 to 60 mm, particularly 20 to 40 mm. When the inner barrier cuffs 61 are laid on the surface of the topsheet 30, the distance W4 between the tip ends is preferably 60 to 170 mm, more preferably 70 to 120 mm. It is also preferable that the outer barrier cuff 60 is parallel to the surface of the topsheet 30, and the distance W3 between folding wrinkles located most innermost when flatly folded is 60 to 190 mm, particularly 70 to 140 mm.
It is also possible to make only one of the outer and inner barrier cuffs 60 and 61, unlike the one shown in the drawing.
(Absorption element)
The absorbent element 50 of the present example has the absorbent body 56 and the package sheet 58 that covers the entire absorbent body 56, but the package sheet 58 may be omitted.
(Absorber)
The absorber 56 may be formed of an aggregate of fibers. As this fibrous aggregate, it is preferable to have a hydrophilic property, and a tow (fiber bundle) of synthetic fibers such as cellulose acetate or the like is required in addition to the lamination of short fibers such as cotton-like pulp and synthetic fibers A filament aggregate obtained by opening the filament can be used. The fiber adhesion amount can be, for example, about 120 to 200 g / m 2 when the surface pulp or the short fiber is laminated, and about 30 to 120 g / m 2 for the filament assembly. The fineness in the case of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of filament aggregates, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimp of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably 15 to 50 per 1 inch. In addition, there are many cases where uniformly crimped crimped fibers are used.
The absorber 56 is extended from the front-rear direction center CL to the front side by 30 to 48% of the total length L5 and to the rear side by 25 to 45% of the total length L5. As shown in Fig. 6, the absorber 56 may have a shape of an hourglass having a front end portion 56F, a rear end portion 56B, and a narrow portion 56N located between the front end portion 56F and the rear end portion 56B and narrower than the front end portion 56F and the rear end portion 56B It is preferable that the absorptive body 56 itself and the barrier cuffs 60 and 61 have improved fitability around the legs. As a specific size, assuming that the front-rear direction length of the front end portion 56F of the absorber 56 is L1, the length in the front-rear direction at the overlapping portion between the absorber 56 and the double-side external sheet 12F is L2, 56 and the back side outer sheet 12B is L4, the minimum width of the constricted portion 56N is W1, the width of the absorbent front end 56F and the width of the rear end 56B of the absorbent article are W2, (1) to (4).
70 mm? W1? W2? 190 mm (1)
0.5? W1 / W2? 0.85 (2)
0 mm? L1-L2? 70 mm (3)
0 mm? L3-L4? 50 mm (4)
If W1 and W2 are too narrow, the standing up of the barrier cuffs 60 and 61 becomes unstable and the amount of water absorption becomes insufficient. If the widths W1 and W2 are excessively wide,
In the above numerical range, there is no absorber 56 in the vicinity of the attaching portion 65 of the barrier cuffs 60, 61 in the groin portion, so that the degree of freedom of movement of the barrier cuffs 60, 61 is increased, and the barrier cuffs 60, It becomes easy to open outward in the direction and tends to touch the skin with respect to the skin, and the followability in the pit surface against the movement of the legs is also improved. Since the absorber 56 on the side of the inner body 200 exists in a sufficient range on the front and rear sides, the standing of the barrier cuffs 60 and 61 is stabilized with this as a starting point. The portions reaching the groin portion from both sides of the front and rear sides are displaced portions that are opened outward in the width direction in a posture in which the barrier cuffs 60 and 61 stand inward in the width direction on the basis of both side edges in the width direction of the inner body 200, The posture change of the barrier cuffs 60 and 61 is supported by the absorber 56 existing up to the side of the inner body 200, so that the overall rising shape of the barrier cuffs 60 and 61 is stabilized. If the constricted portion is too large beyond the above-described numerical range, the degree of freedom of the barrier cuffs 60 and 61 in the groin portion becomes excessively high, and there is a fear that a space is likely to be formed around the leg. There is no possibility that the barrier cuffs 60 and 61 stand up unstable. On the other hand, if the constricted portion becomes too small, the degree of freedom of the barrier cuffs 60 and 61 is lowered.
The longitudinal length L7 of the constricted portion 56N as a whole is preferably 80 mm or more, particularly preferably 120 to 260 mm. If the longitudinal length L7 of the constricted portion 56N is too short, the degrees of freedom of the barrier cuffs 60 and 61 are reduced and the fit of the absorber 56 to the peripheries of the legs is lowered to impede the movement of the legs. The standing can not be stabilized.
(Superabsorbent polymer particles)
It is preferable that the absorbent body 56 be dispersed and contained in the entirety of the absorbent polymer particles. The superabsorbent polymer particles include " powder " in addition to " particle ". The particle size of the superabsorbent polymer particles can be used as it is for the absorbent article of this kind, and it is preferably 1000 탆 or less, particularly 150 to 400 탆. The material of the superabsorbent polymer particles can be used without any particular limitation, but it is appropriate that the absorption amount is 40 g / g or more. Examples of the superabsorbent polymer particles include starch-based, cellulose-based and synthetic polyacrylate-based polymers, and examples thereof include starch-acrylic acid (salt) graft copolymer, a starch-acrylonitrile copolymer cantilever, a crosslinked product of sodium carboxymethylcellulose, (Salt) copolymer and the like can be used. The shape of the superabsorbent polymer particles is suitably in the form of a particulate material usually used, but other shapes may also be used.
As the superabsorbent polymer, a material integrated with an antibacterial substance can be used. Particularly, zeolite particles (hereinafter referred to as "antimicrobial deodorant zeolite") formed by substituting a part or all of ions capable of ion exchange in zeolite with silver ions are contained in a superabsorbent polymer, It is appropriate to use an antimicrobial deodorant superabsorbent polymer particle which is produced by attaching the sexual zeolite particle to the surface of the superabsorbent polymer particle by electrostatic.
As the superabsorbent polymer particles, those having an absorption rate of 40 seconds or less are appropriately used. When the absorption rate exceeds 40 seconds, a so-called reverse flow in which the liquid supplied into the absorber 56 returns to the absorber 56 is apt to occur.
As the superabsorbent polymer particles, a gel strength of 1000 Pa or more is suitably used. Thus, even when the absorbent body 56 having a high volume is used, stickiness after liquid absorption can be effectively suppressed. It is preferable that the absorption rate is 50 seconds or less for the superabsorbent polymer.
The content of the superabsorbent polymer particles is preferably about 100 to 400 g / m 2 , more preferably 170 to 220 g / m 2 , and the content of the superabsorbent polymer is larger than the content of the hydrophilic fibers. Specifically, It is preferable to set the fiber aggregate 1 so that the superabsorbent polymer is about 1.1 to 2.0, particularly about 1.4 to 1.6. This poly hemp content of less than 170g / m 2, the training purposes as if available, but if the user does not aware of disposed several times excretion (urination) has a case leakage to water absorption is low, more than 220g / m 2 A sharp texture is easily transmitted to the wearer, and it becomes strongly aware that the diaper is being used by the wearer during training.
If necessary, the superabsorbent polymer particles can adjust the scattering density or the amount of scattering in the planar direction of the absorbent body 56. For example, the amount of liquid excreted can be made larger than that of other sites. When male and female differences are taken into consideration, it is possible to increase the scattering density of the front side for men and increase the scattering density of the central portion for women. Further, it is also possible to form a portion having no polymer in a local (for example, spot-like) plane direction in the absorber 56. Alternatively, when the pocket portion 57 to be described later is formed on the absorber 56, the superabsorbent polymer may be arranged around the pocket portion 57 with the highest density as compared with the region other than the absorber. Specifically, it is preferable that the superabsorbent polymer is in the range of about 1.4 to 2.2 for the fibrous aggregate 1 in weight comparison. In addition, the high absorbent polymer may be arranged at a high density only in the vicinity of the front end of the pocket portion 57.
(Wrapping sheet)
When the package sheet 58 is used, a tissue paper, in particular, a crepe paper, a nonwoven fabric, a polylair nonwoven fabric, a sheet with a small hole, or the like can be used as the material. However, it is preferable that the sheet is a narrow gap so that the superabsorbent polymer particles do not escape. Since the temperature change from the surface side can be easily detected, the adhesion amount is preferably small and low. The thickness is preferably about 0.05 to 3 mm, more preferably 0.2 mm or less, and the adhesion amount is about 5 to 25 g / m 2 , particularly preferably 15 g / m 2 or less, because the heat transfer from the back side to the skin is excellent. When a nonwoven fabric is used, a nonwoven fabric processed by a spunbond method or an SMS method, particularly a nonwoven fabric processed by the SMS method, is suitable in that it is excellent in balance between thinness and strength, and its material is polypropylene, polyethylene / Propylene and the like can be used.
As shown in the drawing, when there is a joint of the package sheet 58 on the surface (wearer side) of the absorbent element 50, in order to effectively detect the temperature change to the wearer, the overlapping width of the seam It is preferable that the width of the area is narrower than 40 W and the size is 40 mm or less, particularly 20 mm or less. Even if this is so narrowed, the superabsorbent polymer particles do not escape due to the above reasons. It is also preferable that the joint of the package sheet 58 is formed on the side portion so as not to include the center in the width direction in contact with the urine drainage port. Particularly, it is preferable that the overlapping portion of the seam sheet of the package sheet 58 on the body side is not overlapped with the portion having the temperature change material to be described later.
(Groin portion outer sheet)
On the back side of the inner body 200, there is a groin portion outer sheet 12M exposed to the outer surface of the product. As the material of the groin portion external sheet 12M, the same materials as those of the double-side external sheet 12F and the double-side external sheet 12B can be used. However, May also be used. Specifically, various nonwoven fabrics such as spun bond nonwoven fabric, melt blown nonwoven fabric, point bond nonwoven fabric, air-through nonwoven fabric, air point nonwoven fabric, spun lace nonwoven fabric and SMS nonwoven fabric made of fibers such as PP, PP / PE and PP / PET, Or a deodorant or the like added thereto may be used.
A high body pressure is applied to the groin portion sheath 12M when sitting. Therefore, a material having a high friction fastness (not fluffy) is preferable.
The groin portion external sheet 12M may be printed or colored so as to be a sheet having design elements. In the case of concurrently with the design sheet described above, it is preferable that the respective designs are arranged so as not to overlap with each other.
It is preferable to use the stretch nonwoven fabric as the groin portion outer sheet 12M to stretch in one direction of the oil of the inner body 200 to improve fitability of the groin portion.
The rigidity of both side portions of the inner body 200 is improved if the groin portion outer sheets 12M are turned from the side in the width direction to the side surface of the body and are adhered and fixed to the outer surface of the barrier sheet 62 with a hot- In such a configuration, it is preferable to use a sheet having a high strength (firmness) in the groin portion sheathing sheet 12M. Specifically, a sheet having a sheet MD direction and a CD direction of 100 mm or more, preferably 150 mm or more in the degree of laminating degree measured according to the Clark method (JIS L1096 C method) may be used.
In the illustrated example, the groin portion outer sheet 12M is sandwiched between the inner body 200 and the outer side sheets 12F, 12B and the bather side and the back side outer sheets 12F, 12B, It is also possible to stick it to the outside of the rear outer sheets 12F and 12B. The grooved portion outer sheet 12M can be attached to the inner surface or outer surface of the back surface of the inner body 200 and the outer and inner sheets 12F and 12B of the inner and outer sheets by a hot melt adhesive or the like.
(Temperature change material)
The absorber 56 is provided with a pocket portion 57 so as to include a portion of 20% of the total length L6 of the article from the center CL in the front-rear direction in the front and back direction of the article. In this pocket portion 57, The temperature change material 40 is disposed. The distance between the front end portion of the pocket portion 57 and the front end portion of the absorber 56 may be 5 to 30% of the total length L6 of the article, but is preferably 10 to 20%. It is preferable that the pocket portion 57 has a thickness of 0 to 50% with respect to an average thickness of the peripheral region, but it is more preferable that the pocket portion 57 is formed to penetrate the absorbent body 56 in the front and back direction. When the pocket portion 57 penetrates the absorber 56 in the front and back directions, the pocket volume for accommodating the temperature change material 40 is increased and the temperature change is efficiently transmitted to the wearer's body.
More specifically, as shown in the drawing, the pocket portion 57 is accommodated in the range of 0 to 40% of the total length L6 of the article from the center CL in the front-rear direction of the article to the front side, To 20% of the total width W2 of the absorber 56, and 57% of the width thereof is 25 to 60% of the total width W2 of the absorber 56. As shown in the drawing, it is preferable that the temperature changing substance 40 is provided only in the pocket portion 57 of the absorber 56 from the standpoint of not interfering with the urine diffusibility and cost-effectiveness, . The shape of the pocket portion 57 can be appropriately shaped, such as a triangular shape, a circular shape, an oval shape, as well as a step shape as shown in the figure. In the case of the panty disposable diaper according to the present embodiment, as shown in Fig. 6, the front-rear direction range in which the pocket portion 57 is provided is a line connecting the lower end portions of the side seals (welded portions 12A) It is preferable that it is appropriately separated from the urination port and effectively brings about a temperature change in a region which is in close contact with the abdomen side portion of the wearer. It is preferable that the distance between the front end of the pocket portion 57 and the front end of the absorber 56 is 20 mm or more in order to prevent yaw leaking from the abdominal side end portion of the absorber 56.
It is preferable that the temperature change material 40 is uniformly provided throughout the pocket portion 57, but it may be varied depending on the region.
The temperature changing substance 40 absorbs or emits heat by dissolving heat, hydration heat, or reaction heat in contact with the urine, and cooling or heating the urine. Examples of the temperature-changing substance 40 that absorbs heat by dissolving the urine are sodium acetate, sodium carbonate, sodium sulfate, sodium thiosulfate, sodium phosphate, sodium phosphate, ammonium acetate, potassium acetate, ammonium chloride, Salicylates such as sodium acetate and urea, and sugar alcohols such as xylitol and sorbitol. Examples of the temperature-changing substance 40 that releases heat by dissolution of urine include aluminum chloride, aluminum sulphide, aluminum sulphate and the like. In the present invention, it is preferable to use organic compounds such as sugar alcohols or urea such as sorbitol and xylitol, which exhibit an endothermic action. In particular, sorbitol and xylitol have excellent solubility, excellent chemical stability, and do not adversely affect the human body, so that they can be used optimally. When a substance which absorbs or heats by the dissolution of urinary tract is used, the solubility of urinary tract in a 100 ml water at a temperature of 20 ° C is preferably 30 g or more, particularly 50 g or more, since a sufficient temperature change can not be exhibited . It is also preferable to generate a calorie change of 20 cal / g or more, more preferably 35 cal / g or more. The change in the amount of heat per unit area is preferably 1 cal / cm 2 or more.
Examples of the substance absorbing or releasing heat by reaction with urine include orthoesters, ketals such as menton ketals obtained by reacting menthol with an alcohol having a carbon content of 1 to 8 or a polyol having a carbon content of 2 to 8, And their structural or optical isomers. An example of the temperature-changing substance 40 that absorbs or emits heat by swelling by the urine is polyacrylic acid partially crosslinked by lightly crosslinking.
The temperature-changing substance 40 is preferably used in a particulate form (including powder form), but it is also possible to use another form such as a fibrous form.
Further, in the form in which the above-described ex- planatory indicator 80 overlaps with the pocket portion 57, particularly in the form in which the ex- planatory indicator 80 overlaps with the pocket portion 57 which allows the absorber 56 to pass through in the up-down direction, moisture The excretion indicator may be discolored due to sweat of the wearer or contact of moisture emitted from the body during use or use, even though the excretion indicator is not excreted. However, when the temperature-changeable substance 40 is a substance having hygroscopicity, for example, a substance having a high solubility in water and a large surface area as described above (specifically, particulate sorbitol or xylitol is suitable) It is possible to prevent discoloration of the unexpected excretion indicator.
In the case of the diaper thus constructed, after passing through the topsheet 30 during urination and sufficiently moving forward by the yoga diffusing action absorbed by the absorbent body 56, it comes into contact with the temperature changing material 40 in the pocket portion 57. Thereby, a temperature change occurs in the pocket portion 57, and this temperature change is transmitted to the wearer's side portion without passing through the absorber 56. [ Thus, when the structure contributes to a change in the yaw rate after sufficiently diffusing and moving, the phenomenon in which the temperature change caused by the supplied urine is weakened or disappears due to the temperature of the urine supplied later can be suppressed, A temperature change suited to the usage amount of the thermosetting resin is generated. Further, since a sufficient temperature change occurs in the pocket portion (front and back penetration portion) 57, it is hardly thermally insulated and is efficiently transmitted to the body. In the illustrated example, the pocket portion 57 of a sufficient size is located almost in the abdomen or lower abdomen of the wearer, and the abdomen or lower abdomen of the wearer is relatively bulged on the body surface. Therefore, So that the temperature change in the pocket portion 57 is easily transmitted to the wearer.
As shown in Fig. 10, the pocket portion 57 including the temperature changing material 40 is arranged at a position of 25 to 45% of the total length L6 of the article with respect to the center CL in the front and rear direction of the article, It is also preferable that the width is extended to 25 to 60% of the entire width W2 of the absorber 56 along the widthwise center of the article to 20 to 40% of the length L6. In this configuration, since the pocket portion 57 including the temperature change material 40 is extended to include the urination position, there is an advantage that a sufficient temperature change can be generated in many cases even when the amount of urine is small. The pocket portion 57 of the illustrated example is in a rectangular shape, but it can be formed into a suitable shape such as a triangular shape within the above-described size range. Since the others are basically the same as the above-mentioned form, the explanation will be omitted.
11, the pocket portion 57 including the temperature changing substance 40 is formed in an annular shape so as to surround the central region 55 of the absorber 56, and the line width 57B thereof is set to 5 - 10%. In this case, the central region 55 is extended along the widthwise center of the article from 15 to 35% of the total length L6 and 15 to 35% of the total length L6 to the rear side from the center CL of the article in the front- Of the total width W2 of the absorber 56 is preferably 40 to 75%. In this configuration, the yoga absorbed by the absorber 56 can reach the pocket portion 57 including the temperature change material 40, and can be brought into contact with the temperature change material 40 even if the yoga is diffused in any direction at the excreted position. Thus, more urine can be brought into contact with the temperature change material 40 in the pocket portion 57, or it can be surely brought into contact with the temperature change material 40 in the pocket portion 57 even if the urine diffusion direction is biased. Others are basically the same as above, so I will not explain it.
The amount of the temperature change material to be used can be determined as appropriate, but when sugar alcohol is used as the temperature change material, the total content of the product is preferably about 4 to 20 g, and more preferably about 8 to 12 g in the case of a diaper for toilette training. (The content per unit area) of the temperature changing substance in the portion where the temperature changing substance 40 is present is about 200 to 1200 g / m 2 , particularly about 400 to 600 g / m 2 in the case of the diaper for toilette training desirable.
Here, in order to clearly perceive the urination to the wearer, it is preferable that the surface of the topsheet 30 has a temperature change of 4 degrees or more, particularly 5 degrees or more. Specifically, when there is no other member between the topsheet 30 and the absorbent element 50 in each of the above-described modes, in order to achieve such a temperature change, it is preferable that the following conditions are satisfied.
Material of liquid-permeable top sheet 30: Non-woven fabric.
Thickness of liquid-permeable top sheet 30: 0.1 to 0.5 mm
Adhesion amount of liquid-permeable surface sheet 30: 10 to 40 g / m 2
Material of the packaging sheet 58: crepe paper or SMS nonwoven fabric.
Thickness of the packaging sheet 58: 0.05 to 0.2 mm.
Adhesion amount of the packaging sheet 58: 5 to 25 g / m 2
Types of temperature-changing substances 40: causing endothermic reaction by dissolution of urinary tract and cooling urine.
Solubility of temperature-changing substance 40 (for 100 ml of water at a temperature of 20 캜): 30 g or more, particularly 50 g or more.
Total area of the pocket portion 57: 2500 to 8000 mm 2
(The total amount of the temperature change material used is the same as the limiting value in the total area of the pocket portion): 500 to 1000 g / m < 2 >
<Temperature change experiment>
(Example 1)
A disposable diaper having a structure shown in Figs. 1 to 10 was produced. Detailed specifications were as follows.
Liquid permeable top sheet 30: an air-through nonwoven fabric made of PE / PP conjugate fiber having a thickness of 2 mm and an adhered amount of 25 g / m 2 .
Packing sheet 58: crepe paper having a thickness of 1 mm and an adhesion amount of 15 g / m 2 .
The size of the absorber 56: from the position 205 mm forward to the position 190 mm from the center in the front-rear direction, and from the position 70 mm to the left 70 mm to the right 70 mm from the center in the width direction. The area is 55,300mm 2 .
Type of the temperature change material 40: sorbitol (the dissolution heat is minus 26 cal / g, "Sorbite" made by Donghwa Chemical Ind. Co., Ltd.)
Solubility of the temperature changing substance 40 (for 100 ml water at a temperature of 20 캜): 70 g.
The size of pocket portion 57 is 70 mm in overall length and 40 mm in overall width, and the front end portion is spaced 75 mm from the front end portion of absorber 56. The area is 2800mm 2 .
Adhesion amount of the temperature change material 40 in the pocket portion 57: 500 g / m 2 .
Structure of the Absorber 56: pulp fiber and superabsorbent polymer particles (uniformly dispersed in the thickness direction of the absorbent body 56 and in the direction orthogonal thereto)
Pulp deposition amount in absorber 56: 110 g / m 2
Adhesion amount of the superabsorbent polymer in the absorber 56: 160 g / m 2 .
Absorption rate of superabsorbent polymer: 35 sec.
(Example 2)
As shown in Fig. 13, a disposable pull-on diaper having the same structure as that of Example 1 was produced, except that the temperature change material 40 was distributed in a predetermined range on the upper surface of the absorber 56 by a predetermined amount. Detailed specifications were as follows.
Liquid permeable top sheet 30: an air-through nonwoven fabric made of PE / PP conjugate fiber having a thickness of 2 mm and an adhered amount of 25 g / m 2 .
Packing sheet 58: Crepe paper having a thickness of 1 mm and an adhesion amount of 15 g / m 2 .
The size of the absorber 56: from the position 205 mm forward to the position 190 mm from the center in the front-rear direction, and from the position 70 mm to the left 70 mm to the right 70 mm from the center in the width direction. The area is 55,300mm 2 .
Type of the temperature change material 40: sorbitol (the dissolution heat is minus 26 cal / g, "Sorbite" made by Donghwa Chemical Ind. Co., Ltd.)
Solubility of the temperature changing substance 40 (for 100 ml water at a temperature of 20 캜): 70 g.
The size of the portion having the temperature changing material 40: a distance from the front side of 160 mm to the rear side of 40 mm from the front side of the front side, a position of 50 mm from the side of 50 mm to the right side Single range of up to. The area is 20,000 mm 2 .
The amount of deposition of the temperature change material 40 in the portion where the temperature change material 40 is present: 500 g / m 2 .
Structure of the Absorber 56: pulp fiber and superabsorbent polymer particles (uniformly dispersed in the thickness direction of the absorbent body 56 and in the direction orthogonal thereto)
Pulp deposition amount in absorber 56: 110 g / m 2 .
Adhesion amount of the superabsorbent polymer in the absorber 56: 160 g / m 2 .
Absorption rate of superabsorbent polymer: 35 sec.
(Example 3)
A disposable pull-on disposable diaper having the same structure as that of Example 1 was produced as Example 3, except that the absorber 56 had no pockets 57 and no temperature change material 40.
(Experimental Method and Experimental Results)
The artificial urine was supplied to the beakers at a temperature of 37 ° C and a volume of 50 cc at a distance of about 15 cm to the center of the diaper in the front-rear direction center and in the width direction for about 3 seconds, A range of 5 cm in diameter was measured at a predetermined time in a noncontact type thermometer in the widthwise center position (near the front end portion of the pocket portion 57) away from the entire length of the article by 70 mm.
A graph of the measurement results is shown in Fig. As can be seen from this graph, in Example 1 according to the present invention, the temperature lowering rate is faster and the lowest temperature is lower than that in Example 2, and the minimum temperature can be maintained for a sufficient time.
<Other Preferred Forms>
When the particulate temperature change material 40 is used, the temperature change material 40 may be configured to move within the pocket portion 57 without being fixed, but the particulate matter of the temperature change material 40 may move freely within the diaper, The temperature change of the temperature change material 40 may be insufficient. For example, the temperature change material 40 may be fixed to the sheet (in the case of the illustrated form, the package sheet 58) constituting the bottom of the pocket portion 57 by fixing means such as an adhesive.
Further, the particulate temperature-change material 40 can be placed in a solid state by heating and melting it and solidifying it, and the temperature-change material 40 has no or only a small amount of free-flowing particulate matter, It is also possible to prevent the moving object from moving.
When a member to be heated together with the temperature changing substance 40 is present in the production of this type, it is preferable that the melting point of the temperature changing substance 40 is lower than that of the member heated together with the temperature changing substance 40. That is, since the disposable diaper usually comprises a thermoplastic resin such as polyethylene or polypropylene, it is preferable that the temperature-changing material 40 has a melting point equal to or lower than that of the resin. Among general thermoplastic resins, polyethylene having a low melting point has a melting point of usually about 100 to 130 DEG C, so that the melting point of the temperature changing material is preferably 130 DEG C or lower, more preferably 100 DEG C or lower. It is preferable to have a melting point of 70 占 폚 or more so that the temperature changing substance 40 does not melt during storage of the product. As the temperature changing material 40, sorbitol and xylitol having a melting point of usually about 95 to 110 占 폚 (depending on purity) are exemplified.
Since the temperature changing substance 40 is applied to the interior of the diaper or to the member constituting the diaper in a state of being heated and melted, the temperature changing substance 40 may be a fiber aggregate such as the nonwoven fabric or the absorbent member 56 , If the viscosity of the temperature changing material 40 at the time of melting is low, it is difficult to penetrate into the gap between the fibers, and there is a fear that the adhesion force is lowered. If the viscosity of the temperature changing material 40 at the time of melting is high, it is difficult to arrange the material at a predetermined position. From this point of view, it is preferable that the temperature change material 40 has a viscosity of 5 to 80 poise at a temperature (for example, 70 to 130 ° C) at the time of melting.
Particularly, by melting and fixing the temperature change material 40 by fusing it with a member adjacent to the periphery, the movement of the temperature change material 40 is eliminated, and a temperature change function can reliably be exerted in the fusion region (for example, . The fused portion of the temperature changing material 40 can also be expected to have an effect as a bonding portion for adhering and fixing the upper and lower members.
The fused portion of the temperature change material 40 is not particularly limited as long as it is a member adjacent to the periphery, but in the case of the illustrated example, the fused portion may be at least one of the absorber 56 and the package sheet 58. When the temperature change material 40 is fused, it is preferable that the fused portion is entirely within the pocket portion 57. However, if the temperature change material 40 is included in addition to the pocket portion 57, It can be fused to an adjacent member.
As a method for fusing the temperature change material 40 to a fusing target such as the absorber 56, a temperature change material 40 having a suitable shape such as a particulate phase (including powder phase) or a short fiber phase is raised to a predetermined position on the upper surface of the fusion target member, The temperature change material 40 is heated together with the fusion target member after the temperature change material 40 is contained in the predetermined portion of the object member (including the case sandwiched between the plurality of members), so that only the temperature change substance 40 is melted and attached to the fiber of the fusion member , And then cooled to solidify the temperature changing material 40 (first method). According to the first method, although depending on the conditions such as the amount of the temperature changing material 40 and the heating time, it is preferable that a particulate temperature change material smaller than that before melting or a lump formed by integrating a plurality of melted temperature change materials The temperature-changing substances 40 on the surface of the substrate are adhered to a plurality of places, or the temperature-changing substances 40 such as a film or a skeleton are continuously attached.
As another method, a method of applying a melt of the temperature changing material 40 to a predetermined portion of a member to be fusion-bonded by applying a nozzle or the like and cooling and solidifying it may be used in a manner simulating the application of the hot-melt adhesive used in the technical field of the absorbent article (Second Method).
In the first method, in the case where the temperature changing material 40 is contained in the fusion-spliced member, in addition to mixing the temperature-changing substance 40 such as particulates or the like to the material (fiber or the like) In the case of a fiber aggregate having a gap extending from the outside to the inside, the temperature change material 40 on the particle surface is imparted with initial velocity to the object to be fused more strongly than the free fall, May be introduced into the member to be fusion-bonded.
In the case of the first method, the heating means is not particularly limited, but for example, the means shown in Figs. 16 to 19 may be employed. The means shown in Figs. 16 and 17 uses an air through-dryer for heating by passing air at a high temperature. In the means shown in Fig. 16, the object to be fused 300 in which the temperature changing material 40 is arranged at a predetermined portion is heated by hot air 302 passing in a direction orthogonal to the conveying surface while being conveyed by the belt conveyor 301, And is cooled by the wind 303 passing in a direction orthogonal to the conveying surface. 17 (a) and 17 (b), the fusing object member 300 in which the temperature change material 40 is arranged at a predetermined portion is wound by a suction roll 311 provided in a heating chamber 310 to which high temperature air is supplied While being heated by hot air 312 passing from the outside of the suction roll 311 to the inside thereof, and cooled by being wound and conveyed by a cooling roll 313 provided outside the heating chamber 310.
The heating means shown in Fig. 18 conveys the heat of the heating roll 320 to the temperature change material by contact, by transferring the fusion object member 300 in which the temperature change material 40 is arranged at a predetermined portion, , And heating on one side.
The heating means shown in Fig. 19 is a heating means for heating the object to be fused 300 in which the temperature changing substance 40 is arranged at a predetermined portion between at least one pair of rolls 330, 331, 340 and 341 serving as heating rolls, Is transferred to the temperature change material by contact and heated. In this case, as shown in the same figure (a), both rolls 330 and 331 may be formed into smooth rolls having smooth surfaces so as not to form irregularities on the fusion target member 300, and as shown in the same figure (b) The irregularities may be formed on one surface of the fusion-bonded member 300 by using an embossing roll having irregularities of a predetermined pattern on one surface of the roll 340. Particularly, in the latter case, the convex partial pattern of the embossing roll 340 may be formed so as to match only the region of the fusion-bonded portion of the temperature change material, and only the region is heated. Since the fused portion is formed only in the region corresponding to the convex partial pattern of the embossing roll 340, the temperature changing material 40 may be arranged in a range wider than the convex partial pattern of the embossing roll 340. When the method of partially heating the member to be fusion-bonded 300 is adopted, it is not necessary to dispose the temperature-change substance 40 only in a predetermined region of the member to be fusion-bonded 300, 40 may be disposed, and only a predetermined region may be partially heated to form a partially welded portion. Further, if the convex partial pattern of the embossing roll 340 has a plurality of steps, it is possible to divide the convex portion pattern of the embossing roll 340 into a portion where the temperature changing material 40 is thickly fused and a portion where the temperature changing material 40 is thinly fused.
The heating and melting of the temperature changing material 40 in the first method can be performed not only at the time of manufacturing the member to be fused, but also at an appropriate stage of the subsequent manufacturing process, for example, Or after completion of assembly up to the product state, it is also possible to apply to the inner body 200 or the entire diaper. As the heating method in this case, for example, the means shown in Figs. 16 to 19 described above can be applied.
In the first method, the temperature changing material 40 fused to the fusion-bonded member is once melted and liquefied and solidified, so that the surface area is reduced. Therefore, since the contact area of the temperature change material 40 with the urine is reduced, the rate of temperature change is suppressed, and the sustainability is improved. However, if the rate of temperature change is uniformly lowered, the wearer may be less likely to perceive the temperature change. Thereafter, a granular material having a low density is used as the temperature changing material 40, and the whole is not melted but a part thereof is melted into a solid having a high density, while the remaining material remains as a granular material having a low density I do not need to do it). When the particles of the temperature change material 40 on the particle surface have the same particle diameter, the lower the density, the larger the surface area and the higher the contact efficiency with the urine, and the faster the rate of temperature change. This tendency is conspicuous particularly when the temperature change material 40 dissolves in the urine and changes in temperature occur. Therefore, as described above, when only a part of the temperature change material 40 is melted, the temperature change material 40 that retains the particulate phase has a very rapid temperature change action, and the melted and solidified temperature change material 40 has a temperature change action , It is possible to obtain a temperature change that combines rapid efficacy and long-lasting effect. In order to balance the rapidity and the delayed effect of the temperature change, the residual ratio of the particulate matter is suitably about 30 to 70% by weight. From the viewpoint of preventing the movement of the temperature changing material 40, the residual ratio of the particulate matter is suitably about 0 to 50% by weight. Therefore, the residual ratio of the particulate matter is preferably 30 to 50 wt%.
As the particulate temperature change material 40 having a low density, granules, particles having a large surface irregularities, porous particles such as fine particles on the surface or inside are suitable. The degree of density may be appropriately determined, but preferably 50% or less (having a space (space) of 50% or more with respect to the apparent volume) of the true density. For example, in the case of sorbitol, the true density is 1.50g / cm 3, so, the preferred bulk density is less than 0.75g / cm 3, is 0.50 ~ 0.70g / cm 3 is more preferable, 0.55 ~ 0.65g / cm 3 Particularly preferred. When the particle size is large, the small particle size of the external appearance is small, but the surface area is not large. Therefore, when the particulate temperature change substance 40 is used, the average particle size (JIS K 1474-2007 MEDIUM) is preferably 200 to 600 μm .
The temperature changing substance 40 can be fused to the inside of the diaper or to the member constituting the diaper by the above-described method. However, the fused portion is hardened by this method, so that the feeling of fit becomes hard and the fitability to the body is also lowered. Therefore, a combination of the softening means to be described later is required. That is, the first means is to crush the fused temperature change material 40 by adding mechanical pressure to the portion including the fused portion of the temperature change material 40. Such a treatment is preferable because a continuous process can be performed by sandwiching the member to be fused and sandwiching it between the rolls. Heating may be carried out at the time of pressurization, but it is preferable to pressurize without changing the temperature since it is difficult to crush the temperature change material.
The pressurizing step may be carried out by partially scattering, for example, an embossing process or the like, in addition to the entirety of the target portion. Fig. 14 shows the latter pressurized configuration, reference numeral 45 denotes a pressurizing section, and reference numeral 46 denotes a non-pressurized section. In the latter pressing type, it is preferable that the center distance 45d of the pressing portion 45 is in the range of 2 to 25 mm both in the front-back direction and the width direction. The ratio of the area per unit area of the pressing portion 45 and the portion having the non-pressing portion 46 is preferably about 20 to 70%, more preferably about 30 to 50%. If the spacing of the pressing portions 45 is too wide or the area of the non-pressing portions 46 is excessively large, the softening tends to become insufficient. If the spacing of the pressing portions 45 is too narrow or the area of the non- So that the amount of the temperature-changing material 40 which is separated from the fusion-bonded member at the time of pulverization increases. In addition, the arrangement of the pressing portions 45 can be appropriately determined, and it is also possible to zigzag as shown in Fig. 14 (b) in addition to a matrix form as shown in Fig. 14 (a). A part of the temperature-changed substance 40 which has been pulverized and broken down by the press working is allowed to freely move inside the diaper, away from the fused member. The amount of this free glass (particulate matter) is preferably small, specifically 0 to 30% by weight, particularly 0 to 10% by weight, of the entire temperature changing material 40. In the present invention, the particulate matter in a state capable of freely moving within the diaper is not fixed to the member constituting the diaper, and may be in the form of granules or powdery (Powder), it is assumed that it includes a suitable shape such as a short fibrous shape or a block shape. However, for each " particle ", the maximum length when measuring the length in an arbitrary direction is 30 mm or less, and the maximum weight is 1 g or less. Of course, when the " particle " is too large, it accompanies discomfort when worn, so the maximum length is actually 10 mm or less and the maximum weight is 0.2 g or less.
15, the fused portion of the temperature changing material 40 is intermittently formed in at least one of the front-back direction and the width direction (that is, alternately with the fused portion and the non-fused portion). More specifically, in the example shown in Fig. 15 (a), the fused portions of continuous cord-like or band-shaped temperature change materials 40 along the front-back direction are formed in a plurality of rows at intervals 47 in the width direction. In the example shown in Fig. 15 (b), the fusion-bonded portions of the temperature-changeable material 40 having a proper shape are arranged in an intermittent pattern in both the forward and backward directions and the width direction. In this case, the shape of the fused portion of the temperature changing material 40 is a step shape in the illustrated example, but may be a diamond shape, a triangle shape, or a circular shape. The fused portions of the temperature changing material 40 are arranged in a matrix form in the illustrated example, but may be arranged in any arrangement such as a zigzag shape. The interval of the fused portions of the temperature changing material 40 can be properly determined, but is preferably set to about 3 to 15 mm in both the front-back direction and the width direction. The width 48 in the intermittent direction of each of the temperature changing materials 40 is preferably about 3 to 40 mm, more preferably about 5 to 10 mm. If the gap 47 between the fusion-bonded portions of the temperature change material 40 is excessively wide or the width 48 is excessively narrow, the capacity of the temperature change material 40 may be insufficient. If the gap 47 is excessively narrow or the width 48 is excessively wide, have.
The intermittent disposition of the fused portion of the temperature changing material 40 may be performed by intermittently placing the temperature changing material 40 in a predetermined intermittent pattern with respect to the member to be fused and then heating it, 40 < / RTI > in a predetermined intermittent pattern. Also in the second means, the unfused (particulate) content of the temperature changing substance 40 is preferably about 0 to 30% by weight, particularly preferably 0 to 10% by weight.
The third means is that 30 to 90% by weight (particularly preferably 50 to 70% by weight) of the temperature changing substance 40 is fused to the portion containing the plurality of temperature changing substances 40 such as particulates, (70 to 10% by weight, particularly 50 to 30% by weight) of the temperature changing substance 40 is not fused. By controlling the fusion ratio of the temperature change material 40 as described above, the hardening due to fusion of the temperature change material 40 can be reduced. In the first method, the temperature change material 40 is placed in a predetermined range of the member to be fusion-bonded, and the temperature change 10 to 90% by weight of the substance 40 is fused and the remaining is not fused. The first to third means may be adopted in any one, two or three combinations.
The degree of softening by these methods can be appropriately adjusted, but it is preferable that the stiffness of the portion of the diaper having the fused portion of the temperature changing material 40 is 15 to 50 cN / 50 mm, particularly 20 to 35 cN / 50 mm . It is preferable that the stiffness of the portion where the temperature changing material 40 does not have the fused portion is about 1 to 25 cN / 50 mm, particularly about 5 to 15 cN / 50 mm. In a normal case, And the difference in rigidity with respect to the portion is preferably about 5 to 20 cN / 50 mm.
The term "rigidity" refers to the torsional rigidity (strength) and is measured by the following method in accordance with JIS K 7171 (test method of plastic-torsional rigidity). The torsional rigidity of the inner body 200 in the front-rear direction of the product is measured using a Tensilon tester (curvature radius R1 = 5.0 ± 0.1 mm at the tip of the indenter, and radius of curvature R2 = 5.0 ± 0.2 mm at the tip of the support plate). The test piece is produced by removing the elastic stretchable member that affects the measurement from the inner body 200 and removing it in a rectangular shape of 80 mm in one direction of oil in the diaper and 50 mm in the diaper width direction. 50 mm in the unit of the curvature value is the length of the short side of the test piece and the width of the test piece bent by the indenter in the test. The above test pieces were placed on a pair of support plates each having a distal end on a circular arc and arranged at an interval between the ends (upper ends) of both distal ends so that one direction of the oil was perpendicular to each plate And place the tip of the indenter to barely touch the specimen. The indenter is lowered under the condition of 5 kg of load cell (196 cN of range) and a speed of 30 mm / min, and a load-deflection curve is obtained. The maximum value of the obtained curvature stress is defined as the curvature value (cN / 50 mm). When the portion to be measured is smaller than the sampling size, it is measured with a test piece of a small scale, and converted into proportional calculation based on the size ratio (ratio).
It is also proposed to make the temperature change material 40 in the pocket portion as a fibrous (or planar) material (not shown) as another method for preventing the movement of the temperature change material 40 without interfering with the flexibility. Since the layer of the fibrous temperature change material 40 is flexible, hardening hardly occurs even in the portion where the temperature change material 40 is present. Further, since the surface area is large and there is a minute gap between the layers, dissolution into moisture (urine) is rapid. And does not move freely within the diaper. Of course, almost no particulate matter that can be moved in the diaper is left.
In order to make the temperature changing material 40 a fibrous layer, general fiber technology or a hot melt adhesive application technique can be applied. As typical techniques, a spunbond method, a melt blown method in a fiber technology, and a curtain spray method in a hot-melt adhesive application technique can be mentioned. In these methods, although a fibrous material is obtained by using different types of nozzle units, the nozzle unit is common in that it has a plurality of discharge ports and an air discharge port for discharging the melt to the seal. The temperature changing substance 40 supplied to the nozzle unit in the molten state is discharged from the discharge port. The temperature changing substance 40 discharged from the discharge port is formed into a fiber shape by the air jetted from the air jetting port and dispersed on the conveyor or on the member constituting the diaper to form a layer of the filamentary fiber do. It is preferable that the air is heated air. The temperature of the heated air is preferably equal to or higher than the melting point of the temperature changing material 40 by 50 ° C or more, and more preferably 50 to 120 ° C higher than the melting point. The jetting pressure of the air is preferably 1.0 to 3.0 kg / cm < 3 >.
Alternatively, it is also possible to form sediments of the temperature-change material 40 on the surface by mimicking the method of producing cotton candy, and then form or cut them appropriately. When the temperature-changeable substance 40 is a sugar alcohol exhibiting a sugar-like property, it is also an appropriate method to apply such a cotton candy manufacturing technique.
The fibrous temperature change material 40 does not necessarily have to be fused. A part of the fibrous material of the fused temperature-change material 40 can be strongly fixed by fusion to a member constituting the diaper, but as described above, the fibrous layer alone is sufficient to prevent movement in the diaper. However, it is also possible to use this fibrous layer as a layer for positively bonding. The thickness of the fiber of the temperature changing material 40 can be properly determined, but may be about 1 to 1000 dtex, preferably about 1 to 4 dtex.
The other points, such as the portion where the layer 40 of the fibrous temperature-change material 40 is made, the amount of the temperature-change material 40, and the stiffness are the same as the fused portion of the temperature-change material 40 in the main mode described above. do.
On the other hand, the movement of the temperature change material 40 can be solved by fusing a temperature change material to an appropriate member inside the absorbent article as described above. However, the portion where the temperature change material 40 is fused is hardened, There is a risk. 20 (a) and Fig. 21, the temperature-changeable material 40 in the pocket portion 57 is bonded to the surface side member (the portion of the package sheet 58 located on the front surface side of the absorber 56) and the back side member (The portion located on the back side of the absorber 56 in the sheet 58), and only a part 41 thereof is fused to the front side member and the back side member in a frame shape, and the remaining portion 42 is the non- And is enclosed in a movable state to a portion surrounded by the sealing member.
The inside of the mold-shaped fusion portion 41 is surrounded by the package sheet 58 which is the front side member and the back side member and the periphery is surrounded by the mold-shaped fusion portion 41. Therefore, The temperature changing material 42 can move only within the range of the fused portion 41 of the frame shape. Therefore, the movement of the temperature change material 40 is suppressed, and a desired temperature change occurs. Since the fused portion 41 of the temperature changing material 40 has a frame shape, the entirety of the fused portion 41 is much more flexible than that in which the entire surface is fused, and the hardening due to fusion of the temperature changing substance can be suppressed.
The frame-shaped fused portion 41 may be only one, but it is preferable to provide a plurality of frame-shaped fused portions 41 to a certain small size. In the latter case, it is possible to provide a plurality of rectangular or circular frame-shaped fused portions, but it is preferable to form the fused portion 41 of the lattice pattern as shown in the figure. The lattice pattern may be a lattice pattern composed of only fused lines along oblique directions intersecting the front and back direction and the width direction, as shown in Fig. 22, in addition to the fused line along the front-back direction and the fused line along the width direction . 22 (a), each of the fused lines may be formed in a continuous line. However, as shown in Fig. 22 (b), the fused portion M and the non-fused portion N of the temperature change material are alternately arranged 22 (c), a pattern in which one of the fused lines passes through the unfused portion N of the other fused line at each crossing position, or a pattern in which the fused portion of the temperature- M and the unfused portion N are alternately arranged, the fused portion 41 of the temperature change material is discontinuous, so that if the fused portion N of both fused lines is located at each of the intersections, 41 is more preferable because hardening by the above-mentioned method is further reduced.
Specifically, it is preferable that the stiffness of the portion of the diaper having the fused portion of the temperature changing material 40 is 15 to 50 cN / 50 mm, particularly 20 to 35 cN / 50 mm. Particularly, it is preferable that the stiffness of the portion where the temperature changing material 40 does not have the fused portion is about 1 to 25 cN / 50 mm, particularly about 5 to 15 cN / 50 mm, The difference in rigidity of the portion is preferably about 5 to 20 cN / 50 mm.
The term "rigidity" refers to the torsional rigidity (strength) and is measured by the following method in accordance with JIS K 7171 (test method of plastic-torsional rigidity). The torsional rigidity of the inner body 200 in the front-rear direction of the product is measured using a Tensilon tester (curvature radius R1 of the indenter end portion R1 = 5.0 +/- 0.1 mm, curvature radius R2 of the support plate distal end portion = 5.0 +/- 0.2 mm). The test piece is manufactured by removing the elastic stretchable member that affects the measurement from the inner body 200 and peeling it out in a rectangular shape of 80 mm in one direction of the oil and 50 mm in the width direction of the diaper. 50 mm in the unit of the curvature value is the length of the short side of the test piece and the width of the test piece bent by the indenter in the test. The test pieces were placed on a pair of support plates arranged in line with the positions of the intervals between the tip ends (upper ends) of both end portions of the test piece, with one direction of the oil being directed in a direction orthogonal to each plate , And the tip of the indenter is placed so as to barely touch the test piece. The indenter is lowered under the condition of 5 kg of load cell (196 cN of range) and a speed of 30 mm / min, and a load-deflection curve is obtained. The maximum value of the obtained curvature stress is defined as curvature value (cN / 50 mm). When the part to be measured is smaller than the above-mentioned sampling size, it is measured with a test piece having a small scale and converted into proportional calculation based on the size ratio.
Although the size of the mold-shaped fusion portion 41 can be determined as appropriate, the width 41w of the frame line is preferably about 1 to 5 mm, and the inside area of the frame is preferably about 100 to 1000 mm 2 . When there is a fused pattern on the lattice, it is preferable that the length (center distance) 41d between the crossing positions is about 10 to 40 mm, and the crossing angle? (Angle inside the frame) is 60 to 120 degrees. In the case of employing the lattice pattern of the fused lines on the dotted line described above, when the length of the fused portion M in each fused wire is L and the interval between the gaps is d, 0.1L? D? Is satisfied. The position of the unfused portion N is not limited to each of the intersections, and if the above relationship is satisfied, the unfused portions N may be located at positions other than the respective intersections.
In the case where there is a member to be heated together with the temperature changing material 40, the melting point of the temperature changing substance 40 is heated together with the temperature changing substance 40 It is preferable that the material is lower than that of the member.
In the case where the member to be fused of the temperature change material 40 is a fibrous aggregate such as the nonwoven fabric or the absorber 56, if the viscosity of the temperature changeable substance 40 at the time of melting is too high, the penetration into the gap between the fibers becomes difficult, If the viscosity is too low, it is difficult for the fused portion to be continuous in a frame shape. From this point of view, it is preferable that the temperature change material 40 has a viscosity of 5 to 80 fs at a temperature (for example, 70 to 130 ° C) at the time of melting.
It is preferable to use a conventional member as shown in Fig. 20 (a) as the surface side member and the back side member interposed between the temperature changing substances 40, and it is also possible to use the absorber 56 in addition to the package sheet 58. [ Further, although not shown, in the case of a two-layered absorber having a front-side absorber and a back-side absorber superimposed on the backside thereof, the front-side member may be a front-side absorber and the back- You may.
It is also possible to make a dedicated member as at least one of the front side member and the back side member without using a member normally used for a diaper. Fig. 20 (b) shows this example, and the first and second liquid-permeable sheets 45 and 46 are formed as the front side member and the back side member, respectively. In this case, as shown in Fig. 23 (a), the front side member is a front side layer 47a in a layer structure formed by folding a liquid-permeable sheet 47 and the back side member is adjacent to the back side of the front side layer 47a And the back side layer 47b disposed thereon. The number of times of folding is not particularly limited. As shown in Fig. 23 (a), the number of times of folding is not limited to two, and it is also possible to fold in three (folding in a Z-shape in cross section) as shown in Fig. 23 (b). In the latter case, the intermediate layer 47b of the sheet 47 serves as a back side member for the temperature change material 40 on the upper side and the surface side member for the temperature change material 40 thereunder. As the liquid-permeable sheets 45 to 47, materials such as the surface sheet 30 and the second sheet 44 described above, and materials such as the package sheet 58 can be used.
When the temperature change material 40 is fused in a frame shape, it is preferable that the fused portion is entirely within the pocket portion 57, but it may be a part thereof. In the case where the temperature change material 40 is contained in addition to the pocket portion 57, Can be fused to adjacent members around the periphery.
The size of the front surface side member and the back surface side member is not particularly limited as long as it is in a range over which the temperature changing material 40 can be provided. However, if the surface side member and the back surface side member are larger than the range in which the temperature changing material 40 is provided 40), it is preferable that the temperature change material does not fall between the front surface side member and the back surface side member.
As a method of fusing the temperature changing material 40 to the front surface side member and the back surface side member in a frame shape, there is a method of changing the temperature of the particulate (including the powder phase) between the front side member 48 and the back side member 49 The object to be processed 400 in which the substance 42 is sandwiched is subjected to heat embossing at a temperature at which the temperature changing material 42 is melted while being embossed with a frame portion such as a lattice or the like. (A first method) in which irregularities of a predetermined pattern are formed on the surface of one or both of the rolls 340 so that only the frame-shaped fused portion is processed and heated. Thus, the fused portion 41 is formed only in the pressurized heating region corresponding to the convex partial pattern of the embossing roll 340. The inner portion of the frame, which is the other region, is not pressurized and heated, Do not. This first method is preferable because it is possible to form the frame-shaped fused portion 41 only by heat embossing in an appropriate pattern.
As a second method, as shown in Fig. 13 (b), on the opposing face of either the front side member 48 or the back side member 49, the application of the hot melt adhesive used in the technical field of the absorbent article is simulated, The molten liquid 41 of the changing substance is applied in a frame form using a nozzle or roll transfer or the like and at the same time at least the particle temperature change material 42 is arranged inside the mold 41 and the other member is superimposed thereon, 41 is adhered to the surface side member 48 and the back side member 49 by the cooling and solidification thereof. This second method is also easy to incorporate into the production line of the absorbent article and is a preferable form.
As a third method, it is also proposed to combine the first method and the second method described above as shown in Fig. 13 (c). In other words, the melt 41 of the temperature-changing substance is placed at various positions at intervals in the first direction on the opposing face of either the front side member 48 or the back side member 49, And the other member is superimposed thereon so that the melt 41 is applied as an adhesive to the surface side member 48 and the back surface side The member 49 is adhered and thereafter the heat embossing process is performed in a line along the first direction at an interval in the second direction at a temperature at which the temperature changing material 42 is melted. When incorporating this third method into the production line of the absorbent article, it is preferable that the first direction is the line CD direction and the second direction is the MD direction.
As a fourth method, which is completely different from those of the first to third methods, as shown in Fig. 13 (d), between the front side member 48 and the back side member 49, Melting point temperature changing material 42b of the low melting point temperature changing material 42b is arranged in a frame shape and a granular high melting point temperature changing material 42a having a relatively high melting point is disposed inside the frame, A method of heating the melting point temperature changing material 42a so as not to be soluble is also proposed. According to the fourth method, pattern heating and pattern coating are unnecessary (pattern heating or the like may be performed)
In the case of the fourth method, the heating means is not particularly limited. For example, the heating means shown in Fig. 16, the heating means shown in Figs. 17 (a) and (b) And the heating means shown in Fig. 19 (a) can be used.
The heating and melting of the temperature change material 40 in the fourth method is not only a process of adhering the front surface side member and the back surface side member to other members but also a proper step of the subsequent manufacturing process, (Before completion of assembly up to the product state), or after completion of assembly up to the product state, it may be performed on the inner body 200 or the entire diaper. As the heating method in this case, for example, the heating means shown in Figs. 16 to 19 described above can be applied.
The fused portion formed by the above-described first to fourth methods described above depends on the conditions such as the amount of the temperature change material 40 and the heating time, but a plurality of the temperature change materials melted with respect to the front side member and the back side member are integrated The temperature change material 40 in the form of a lump or film is attached in a frame shape. Then, the fused temperature-change material 40 is once melted and liquefied and solidified, resulting in a reduced surface area. Therefore, in the case of the temperature change material 40, since the contact area with the yaw becomes small, the rate of temperature change is controlled and the sustainability is improved. Thus, it is a preferable form to use a particulate material having a low density as the temperature changing material 40. Then, the difference between the effects of quick-action and delayed action can be further confirmed. When the particle size of the particulate temperature change material 40 is about the same as the particle size, the lower the density is, the larger the surface area is, and the higher the contact efficiency with the urine is, the faster the temperature change rate is. This tendency is conspicuous particularly when the temperature change material 40 dissolves in the urine and changes in temperature occur.
The particulate temperature change material 40 having a low density can use the same materials as those described above, and the soul density of the fused portion may be higher than those.
On the other hand, in the case of continuous production by a production line, it is preferable that the material is supplied in a continuous strip shape, and after the fusing of the frame-shaped fused portion, the predetermined size is cut in the MD direction. In this case, however, there is a fear that the temperature change material may be separated from the cutting end in the manufacturing process of the product, the transportation process to the customer, the use process by the user, and the like. As shown in Fig. 25 (a), after the first to fourth methods described above are carried out while conveying the front surface side member and the back surface side member, which are in the form of continuous strips, in a predetermined direction, The front surface side member 48 and the back surface side member 49 on which the mold-shaped fusion portion 41 is formed are cut at predetermined intervals in the MD direction, and the cut end portions (both upstream and downstream in the wave direction with respect to the cut position) It is preferable to perform line-shaped heat embossing along the CD direction. Reference numeral 41E denotes the embossed portion. In this case, since the interval from the cutting position to the fused portion 41 of the line-shaped temperature changing material along the adjacent CD direction is narrowed, the amount of the falling particulate temperature changing substance 42 can be reduced. Particularly, it is preferable that the heat emboss 41E forms a fusion portion of the line-shaped temperature change material along the CD direction as in the first method described above. However, it is preferable that the surface side member 48 and the back side member 49 have strength As shown in Fig.
Further, when the fused portion 41 of the temperature-change material on the line is formed along the CD direction at intervals in the MD direction by the first to fourth methods described above, as shown in Fig. 25 (b) The gap Dc between the fused portions of the temperature change material on the line along the CD direction adjacent to the one side or the other side of the MD in the intended cutting position CT may be made narrower than the interval Do between the other portions. In this case also, since the interval from the cutting position to the fused portion 41 of the temperature-change material on the line along the adjacent CD direction becomes narrow, the amount of the particulate temperature change material 42 falling off can be reduced.
The cutting in these methods may be carried out by cutting each product, depending on the type of the front-side member and the back-side member, in addition to performing the cutting beforehand in advance to the other member.
On the other hand, in order to prevent the movement of the temperature change material 40, when the temperature change material is fused to an appropriate member in the absorbent article as described above, the contact efficiency with moisture decreases due to the decrease of the surface area of the temperature change material, There is a possibility that the efficiency is lowered. It is also proposed to use the molded piece 40T obtained by compression molding the particulate temperature change material 40 as shown in Fig. 26 (a) as the temperature change material in the pocket portion 57. [ One molding piece 40T may be used. However, if the molding piece 40T is too large, it is preferable that the molding piece 40T exists as a plurality or a plurality of small pieces because it gives a wearer a sense of foreign body. These temperature change material forming pieces 40T are not bonded to the adjacent members and are sealed in a movable state but are larger than the gap between the fibers of the package sheet 58 and the gap between the fibers of the absorbent body 56 and are interposed between these members, It can hardly move either in the direction along the surface or in the thickness direction. In addition, since the molded piece 40T of the temperature changing material has a porous structure, the surface area, that is, the contact area with moisture is very large as compared with the simple molten solidified material of the temperature changing material particles. Therefore, Even if it is a very small percentage. Therefore, the movement of the temperature change material 40 is suppressed, and the contact efficiency between the temperature change material and the moisture is not easily lowered, so that a desired temperature change is likely to occur.
It is preferable to use a conventional member as shown in Fig. 26 (a) as the surface side member and the back side member sandwiching the molding material 40T of the temperature change material. In addition to the package sheet 58, the absorber 56 may also be used. Although not shown, in the case of a two-layer structure absorber, there are a front-side absorber and a back-side absorber superimposed on the backside thereof, the front-side member is a front-side absorber and the back- It is also possible.
It is also possible to use a dedicated member as at least one of the front side member and the back side member without using a member normally used in a diaper. Fig. 26 (b) shows this example, and dedicated first and second liquid-permeable sheets 45 and 46 are provided as the front side member and the back side member, respectively. In this case, as shown in Fig. 27 (a), the front side member is a front side layer 47a in a layer structure formed by folding one liquid-permeable sheet 47, and the back side member is a back side layer And the back side layer 47b disposed adjacent thereto may be used. The number of times of folding is not particularly limited, and it is also possible to fold it three times (a method of folding the end face into a Z-shape) as shown in Fig. 27 (b), in addition to folding in two as shown in Fig. 27 (a). In the latter case, the intermediate layer 47b of the sheet 47 serves as a back side member for the molded piece 40T of the temperature change material on the upper side thereof, and serves as a surface side member for the molded piece 40T of the temperature change material thereunder. As the liquid-permeable sheets 45 to 47, materials such as the surface sheet 30 and the second sheet 44 described above, and materials such as the package sheet 58 can be used. In addition, it is preferable to fold the end portion of the sheet such that the folded portion like the package sheet 58 described above is wrapped, thereby preventing the temperature change material 40 from falling off from the end portion.
The molded piece 40T of the temperature change material may be formed only by the above-described temperature change material 40, but may be molded by mixing other materials as long as it is 50% or less. For example, when the superabsorbent polymer particles are mixed, the moisture absorbed or absorbed by the temperature-modifying substance 40 is absorbed immediately and remains on the surface of the article, so that the temperature change can be effectively transmitted to the wearer. In order to maintain the cooled or heated urine, hydrophilic fibers such as pulp and hydrophilic synthetic fibers may be mixed.
The range in which the molded piece 40T of the temperature change material is provided (the range along the diaper surface direction) is preferably the entirety within the pocket portion 57, but may be a part thereof. When the temperature change material 40 is contained in addition to the pocket portion 57 The temperature change material 40 can be formed in the form of a molded piece 40T.
The size of the front side member and the back side member is not particularly limited as long as it is not less than the range of forming the molding piece 40T of the temperature changing material. However, if the front side member and the back side member are larger than the range of forming the molding piece 40T of the temperature changing material Is released from the periphery of the portion where the molded piece 40T of the temperature-change member 40T is present), so that it becomes difficult for the temperature-changing material to fall between the front-side member and the back-side member.
Generally, when compressing the particles to fill the voids between the particles, the compressive force is increased, the bridges supported between the particles are collapsed, the voids are collapsed to deform the particles themselves, and a part of the particles are broken, The gap is filled and the particles are strongly adhered to each other due to the deformation of the particles, and at the contact points of the particles, the surface melts due to the heat generated by the friction between the particles and bonds between the particles, It becomes a lump. The compression-molded piece 40T of the temperature change material is formed using this principle. In the case of a material which is difficult to form particles, a binder (binder) can be used. Sugar alcohols such as sorbitol and xylitol are optimum temperature change substances in that they are easy to form.
The degree of compression of the molded piece 40T can be appropriately determined depending on the particle diameter and density of the raw material particles. As raw material particles, porous particles having a low density such as granules, particles having a large surface irregularities, particles having fine pores on the surface or inside are suitable. The degree of density of the raw material particles may be appropriately determined, but it is preferably 50% or less of the true density (having a gap (space) of 50% or more with respect to the apparent volume). For example, in the case of sorbitol, the true density is 1.50g / cm 3, so, the preferred bulk density is less than 0.75g / cm 3, is 0.50 ~ 0.70g / cm 3 is more preferable, 0.55 ~ 0.65g / cm 3 Particularly preferred. If the particle size is large, the sphere density of the outer appearance is small, but the surface area is not large. Therefore, when the particulate temperature change material 40 is used, the average particle size (JIS K 1474-2007 MEDIUM) is preferably 200 to 600 μm. The sphere density of the molded piece 40T may be higher than these, and concretely, it is preferably compressed to about 50 to 80% of the true density, particularly about 55 to 70%. When the sugar alcohols having an average particle diameter of 200 to 600 μm and a sown density of about 0.50 to 0.70 g / cm 3 are used, the sieve density of the molded piece 40 T is 0.75 to 1.10 g / cm 3 More preferably about 0.80 to about 1.00 g / cm < 3 >.
The size of the molded piece 40T can be determined as appropriate, but if it is too small, it is easy to move. If it is too large, it gives a foreign body feel. Therefore, it is preferable that the thickness is 0.5 to 2.0 mm and the area is a flat piece of 50 to 1000 mm 2 . In addition, the amount of particulate minutes by weight, or molded piece 40T formed which remains in the process of compression molding bending, etc. strips (細片) of area 50mm 2 or less present in the article by fragmentation or broken down by in the diaper manufacturing process after Is preferably 50% or less, more preferably 30% or less, with respect to the transfer capacity of the above-described temperature change material. (That is, the weight ratio of the molded part 40T having a thickness of 0.5 to 2.0 mm and an area of 50 to 1000 mm 2 to the total weight of the temperature change material is preferably 50% or more, particularly 70% or more).
On the other hand, in the absorbent article having such a molded piece 40T, the molded piece 40T of the temperature-changing substance is preliminarily manufactured by compression molding such as tableting (tumbling) or the like, However, as an apparatus for manufacturing an absorbent article, there is a problem that new development of a manufacturing facility becomes necessary because a technique of incorporating something with a certain size such as a tablet is not used in general. For this reason, the present invention also proposes a technique of incorporating a molded piece of a temperature change material between predetermined members by use or application of existing technology. That is, as shown in Fig. 28, the particulate temperature change material 40p is sandwiched between the predetermined surface side member 48 and the back side member 49, and is compressed by the pair of rolls 340 and 341 to form a part of the particulate temperature change material 40p Or all of them are compressed and formed as a molded piece 40T. As can be seen from these manufacturing forms, all of the temperature change materials included in the product may be the molded piece 40T, or some of the temperature changing substances 40p may become the particulate phase 40p while remaining in the particulate form or collapsing after being molded once .
As the pair of rolls 340 and 341 used for compression molding, it is possible to use a smooth roll having no irregularities on the surface of both rolls 340 and 341, or to use an emboss roll having irregularities of a predetermined pattern on either or both surfaces It is possible. Even in the case of the former, since the entirety of 40p of the temperature change material on the particle phase is not compressed at once, the whole is not formed as one large molded piece, and as shown in Fig. 28 (b), a large number of cracks are formed in the whole, Small pieces) 40T are formed. In the latter case, a plurality of small pieces 40T having a regular shape can be formed by the emboss pattern. It is also preferable that the number of small pieces having an area of 50 to 1000 mm 2 is 50% or more.
As shown in Figs. 10 (b) and 27, when the front surface side member and the back surface side member are sheets, the products are easily manufactured by carrying out the compression molding process described above before bonding these sheets to other members can do. When the particulate matter of the temperature change material is placed between the sheets and compressed, the particulate matter may move between the sheets during the compression in the batch, and may be shifted or fall off. Such a problem can be solved to some extent by causing the surface of the sheet to have a lot of surface fuzz or to have a large volume. However, by mixing a certain amount of fibrous material such as pulp or synthetic fiber into the particulate matter of the temperature changing material, . In this case, the mixing ratio of the fibrous material is suitably 50% or less, preferably 10 to 30%. Sugar alcohols such as sorbitol and xylitol can be mixed with materials that are difficult to be compression molded because they are easy to form particles. When the amount of the temperature changing substance is 50% or more, up to about 30% of superabsorbent polymer particles .
When the absorber is used as either the front side member or the back side member, particularly when the front side member is the package sheet 58 and the back side member is the absorbent body 56 as in the same example, The temperature of the particulate change material is dispersed between the two-layered absorbers, and then the absorber 56 and the temperature-change material are wrapped with the wrapping sheet 58 to form a package absorber. Thereafter, the package absorber is compressed with a pair of rolls Products can be manufactured. As described above, in the general manufacturing method of the absorbent article, since the pressure is applied to the absorbent body 56 after being packed with the package sheet 58 by a pair of rolls for the purpose of fixing the package sheet 58, Such a manufacturing method can be adopted only by changing the pressing conditions by molding, and it is very easy to apply to existing facilities. It is also easy to appropriately mix the superabsorbent polymania or fibrous material in the molded piece 40T by adjusting the method of scattering the particulate temperature change material and the method of forming the absorber 56. [
[Industrial Availability]
INDUSTRIAL APPLICABILITY The present invention can be applied to a wide range of uses such as panty type, tape type, or pad type absorbent article. Particularly, in addition to disposable diapers for training, it can be used for the purpose of suppressing the propagation of germs caused by cooling of excretion, suppressing bad odors, and preventing poor circulation.
