TW202114610A - Absorbent article - Google Patents

Abstract

To provide an absorbent article for which tearing of the inside end of a seal pattern is suppressed when being worn and tearing along said inside end is possible when being removed. The above problem is solved by an absorbent article characterized in that: a leg opening portion is included, formed by a stomach-side exterior body, a back-side exterior body, and an interior body at one end in a direction orthogonal to the width direction of a side seal part 21; the side seal part 21 has a first seal pattern in which a plurality of horizontally-long, linear first seal sections 71 are arranged so as to be spaced apart by predetermined intervals in the direction orthogonal to the width direction, and a second seal pattern in which second seal sections 72 are arranged in the respective predetermined intervals; the second seal pattern is positioned more toward the center than the width-direction inside end of the first seal pattern; and the first seal sections 71 and the second seal sections 72 are separated from each other in the direction orthogonal to the width direction.

Description

Absorbent articles

The present invention relates to an absorbent article of pants-type disposable diapers.

Absorbent articles such as trouser-type disposable diapers are, for example, absorbent articles provided to wearers who have difficulty in going to the toilet for excretion. Here, when the absorbent article is to be worn, the caregiver must easily wear the absorbent article on the wearer, and the wearer must also be able to move easily. Previously, this absorbent article was designed so that the caregiver can easily wear the absorbent article on the wearer by providing elastic members at the waist opening and leg openings, and it is also designed to have followability and Make it easy for the wearer to move.

When undressing, the caregiver removes the absorbent article while the wearer remains standing or lying down. For example, by tearing the side seal portion of the absorbent article in the vertical direction, the caregiver can easily remove the absorbent article from the wearer. Therefore, the cracked part can also be designed to be relatively easy to crack (Patent Documents 1 to 3).

Based on this foundation, Patent Document 1 discloses an invention of a pants-type disposable diaper, which is provided with a fragile part, which is located on the inner side of the side seal part in the width direction, extends along the side seal part and along this side The breaking strength of the sealing part is lower than that of other parts of the exterior body, so that the sealing part can be broken along this side. However, this invention has the following problems. When the caregiver wants to wear the absorbent article on the wearer, or when the wearer performs daily actions, stress is easily applied to the vicinity of the side seal portion. If it is an absorbent article with a fragile part in the side seal part, the fragile part may break without warning due to this stress.

Patent Document 3 discloses a pants-type disposable diaper provided with a first seal pattern to a third seal pattern in the side seal portion. The first seal pattern is located on the proximal side with respect to the center of the body in the width direction, the second seal pattern is located on the distal side with respect to the center of the body in the width direction, and the third seal pattern is located between the first and second seal patterns . This pants-type disposable diaper (absorbent article) is designed so that the caregiver uses both hands to grasp the ventral exterior body and the back exterior body near the side seal part, and make the ventral exterior body and the back exterior body The two sides of the body are pulled apart away, so that the side seals in the ventral body and the back body are peeled and broken, so that the body is removed from the wearer. Specifically, the entire first seal pattern to the third seal pattern are designed so that the abdominal exterior body and the back exterior body can be separated and peeled off. Regarding this design, the document clearly states that "...at each of the aforementioned intervals, the first seal pattern and the second seal pattern must be simultaneously broken...". However, if it is this type, depending on the amount of force exerted by the caregiver, part of the side seal may not be broken, or although the first seal pattern is broken but the second seal pattern is not broken, there will be caregivers. It is not easy to implement a broken situation easily.

[Prior Technical Literature] (Patent Document) Patent Document 1: Japanese Patent Application Publication No. 2018-139718 Patent Document 2: Japanese Patent Application Publication No. 2019-22602 Patent Document 3: Japanese Patent Application Publication No. 2018-183486

[The problem to be solved by the invention] Therefore, the main problem to be solved by the present invention is to provide an absorbent article, the seal pattern part is not easy to crack when worn, but can be easily cracked along the inner end part of the seal pattern when removed.

[Technical means to solve the problem] The absorbent articles that solve the above problems are as follows. ＜The first aspect＞ An absorbent article, characterized in that it has: The inner body, the ventral outer body at one end of the longitudinal direction of the inner body, and the back outer body at the other end; A pair of side seals, which are formed by superimposing and welding the two sides in the width direction of the aforesaid ventral exterior body and the two sides in the width direction of the back exterior body; and, The leg opening is formed by the ventral exterior body, the back exterior body, and the interior body at one end of the side seal portion that is orthogonal to the width direction; Wherein, the side seal portion has a first seal pattern and a second seal pattern, and the first seal pattern has a plurality of horizontally elongated first seals arranged at predetermined intervals in a direction orthogonal to the width direction. The second seal pattern is constituted by arranging second seal portions at each of the aforementioned predetermined intervals, The second seal pattern is located closer to the center than the inner end in the width direction of the first seal pattern, and The first sealing portion and the second sealing portion are separated in a direction orthogonal to the width direction.

(Effect) A side seal portion arranged in a direction (up and down direction) orthogonal to the width direction of the absorbent article, the side seal portion has a first seal pattern and a second seal pattern, and a plurality of the first seal patterns are arranged The horizontally elongated seal portion is formed, so if, for example, the caregiver uses his left and right hands to grasp each of the back exterior body and the ventral exterior body near the side seal portion in the waist opening, both sides in the width direction When an external force is applied to the sides (that is, the left direction and the right direction) to pull the side seals apart, the exterior body is split along the first seal pattern and the second seal pattern on the inner side of these seal patterns. In addition, when wearing, for example, the caregiver grasps the appropriate part of the waist opening and slides the absorbent article to the crotch. At this time, the external force applied to the side seal is different from the external force applied when removing, and it is difficult to make the side seal The part is split. Further, if the second seal pattern is located closer to the center than the inner end in the width direction in the first seal pattern, and the first seal portion is separated from the second seal portion, the inner end portion in the seal pattern is continuous, so that The side seal part is not easy to accidentally split.

＜The second aspect＞ The absorbent article according to the first aspect, wherein the ratio of the length of the predetermined interval between the first sealing parts to the length of the second sealing part in the direction orthogonal to the width direction is 1.5: 1.0 to 3.0: 1.0.

(Effect) If the ratio is within this range, the external force when the absorbent article is ruptured during removal can be appropriately transmitted from the specific sealing part in the first sealing pattern to the second sealing closest to this sealing part. The seal in the pattern. On the other hand, when worn, the inner end of the first sealing portion and the inner end of the second sealing portion in the exterior body are alternately continuous and not easily split.

＜The third aspect＞ The absorbent article according to the first aspect or the second aspect, wherein each of the aforementioned second sealing parts is longitudinally elongated.

(Effect) If the second sealing portion after welding is longitudinally elongated, the exterior body is guided along the sealing portion, so when the absorbent article is split, the side seal portion is likely to be split in the vertical direction.

＜The fourth aspect＞ The absorbent article according to any one of the first aspect to the third aspect, wherein each of the second sealing parts on the leg opening side among the second sealing parts is located in the The center part in the width direction in the first sealing part.

(Effect) Following the action of the wearer's thigh base (where the thigh and the body are connected), the shape of the leg opening side in the side seal portion is changed. This change causes the open side of the leg to receive an external force. If each of the second seal portions on the leg opening side is located at the center of the first seal portion in the width direction, the end edge of the second seal portion in the longitudinal direction is the first seal closest to the end edge. The distance of the inner end of the first sealing portion in the pattern is relatively long. In this way, it is relatively difficult to transmit external force from the end edge to the inner end. Therefore, even if the wearer makes the base of the thigh move freely, the first seal portion and the second seal portion on the leg opening side of the side seal portion are not easily split during wearing.

＜Fifth aspect＞ The absorbent article according to any one of the first aspect to the fourth aspect, wherein, with respect to the longitudinal direction of the first seal part, the second seal pattern is on the leg opening side The longitudinal direction of each of the aforementioned second sealing portions is oblique.

(Effect) Of the one end and the other end in the longitudinal direction of the second seal portion arranged obliquely, the distance N1 between this end and the inner end of the first seal pattern closest to this end is N1, and the other end is closest to The distance N2 of the inner end side of the first seal pattern at the other end is different in length from the distance N1 and the distance N2. Assuming that the distance N1 is longer than the distance N2, the external force is relatively difficult to transmit between the distance N1. Therefore, even if the wearer allows the thigh base to move freely, the first seal portion and the second seal portion on the leg opening side in the side seal portion are not easily split.

＜Sixth aspect＞ The absorbent article according to any one of the first aspect to the fifth aspect, wherein each of the second sealing portion on the leg opening side in the second sealing pattern is longitudinal Long dotted line.

(Effect) Since this second sealing part is a longitudinally long broken line, there is a gap between the solid line and the solid line that are adjacent in the longitudinal direction. To tear along this interval, it is necessary to apply a stronger external force than to tear along a solid line.

＜Seventh aspect＞ The absorbent article according to any one of the first aspect to the sixth aspect, wherein the length of the first sealing portion in the longitudinal direction is 2.0 to 5.0 mm; The ratio of the length of the longitudinal direction of the said 1st sealing part to the length of the longitudinal direction of the said 2nd sealing part is 1.0:0.1-1.0:0.5.

(Effect) If it is in the range of the ratio, the side seal part welded by the first seal part will not easily crack during wearing.

[Effects of the invention] According to an absorbent article of the present invention, the inner end of the sealing pattern is not easily split when worn, and can be split along the inner end when removed.

Hereinafter, a pants-type disposable diaper as an example of an absorbent article will be explained in detail with reference to the drawings. In addition, the dotted parts in the figure indicate adhesives such as hot-melt adhesives.

Fig. 1 to Fig. 6 and Fig. 11 show an example of a pants-type disposable diaper. This shorts-type disposable diaper (hereinafter also referred to as a diaper) has: the outer body 20 from the front body F to the back body B; and, it is fixed to the outer body 20 so as to extend from the front body F to the back body B The inner surface of the inner body 10; the inner body 10 is composed of an absorbent body 18 between the liquid-permeable top sheet 11 and the liquid-impermeable sheet 12. A trouser-type disposable diaper is made. When it is manufactured, the back surface of the inner body 10 is joined to the inner surface (top surface of the outer body 20 (the dotted part in FIG. 2) by joining means such as hot melt adhesive). ) Afterwards, the inner body 10 and the outer body 20 are folded at the center of the front and rear direction (longitudinal direction) of the boundary between the front body F and the back body B, and the two sides are mutually welded by thermal welding or ultrasonic welding. The side seal 21 is joined and formed to form a waist opening and a pair of left and right leg openings.

(Example of the structure of the interior body) The inner body 10, as shown in FIGS. 4-6, has a structure in which an absorbent body 18 is present between the top sheet 11 and the liquid-impermeable sheet 12, and the absorbent body 18 absorbs and maintains the top sheet 11 The excretion fluid. The planar shape of the inner body 10 is not particularly limited, and it is generally formed into a substantially rectangular shape as shown in the figure.

As the top sheet 11 covering the surface side (skin contact surface side) of the absorber 18, a porous or non-porous non-woven fabric or a porous plastic sheet can be suitably used. As the raw material fibers constituting the nonwoven fabric, in addition to synthetic fibers such as olefin-based, polyester-based, and polyamide-based fibers such as polyethylene or polypropylene, recycled fibers such as rayon or cuproammonium fibers, and cotton can also be used. For natural fibers such as spunlace, spunbond, thermal bond, meltblown, and needle punching, non-woven fabrics can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drape, and the thermal bonding method is excellent in terms of bulkiness and flexibility. When a large number of through holes are formed in the top sheet 11, urine and the like can be quickly absorbed. In the illustrated form, the top sheet 11 is wound around the side edge of the absorber 18 and extends to the back side of the absorber 18.

As the liquid-impermeable sheet 12 covering the back side (skin non-contact surface side) of the absorber 18, a liquid-impermeable plastic sheet such as polyethylene or polypropylene can be used, but it is suitable for preventing stuffiness in recent years. Use a moisture-permeable sheet. This water-shielding and moisture-permeable sheet is, for example, a microporous formed by melting and mixing inorganic particles such as calcium carbonate in an olefin resin such as polyethylene or polypropylene, and forming the sheet, and then extending in one or two axial directions. Sex film. In the illustrated form, the liquid-impermeable sheet 12 is folded back to the back side on both sides in the width direction of the absorber 18 together with the top sheet 11, but it is not limited to this structure, and other conventional structures can also be adopted.

On both sides of the inner body 10, three-dimensional pleats BS are formed mainly to fit around the legs. This three-dimensional wrinkle BS, as shown in FIGS. 5 and 6, is a two-layered wrinkle sheet 15 by folding back, and the wrinkle sheet 15 forms a fixed part, a main body, an overturned part, and a free part. The fixing part is fixed to the side of the back of the inner body 10; the body part, from then on, the fixing part extends through the side of the inner body to the side of the surface of the inner body; the falling part is the body part The front and rear end portions of the inner body are fixed to the sides of the inner body in a fallen state; the free part is formed by making the unfixed parts between the fallen parts non-fixed; between the two layers, in the free part An elongated corrugated elastic member 16 is arranged at the front end portion of the device. Furthermore, with this structure, the three-dimensional wrinkle BS, the free part that protrudes more than the side edge of the absorber by the contraction of the wrinkle elastic member 16 becomes a two-dot chain line as shown in Figure 6 in the product state. Stand up as shown. As the corrugated sheet 15, a non-woven fabric having water repellency can be suitably used.

As the corrugated elastic member 16, commonly used styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used. And other raw materials. In order not to be easy to see from the outside, the thickness may be 925 dtex or less, the tension may be 150 to 350%, and the interval may be 7.0 mm or less. In addition, as the corrugated elastic member 16, in addition to the wire shape as shown in the figure, a band-shaped member having a certain width can also be used.

The raw material fibers constituting the aforementioned corrugated sheet 15 are also the same as the top sheet 11. In addition to synthetic fibers such as polyethylene or polypropylene, olefin-based, polyester-based, and polyamide-based synthetic fibers, it can also be rayon or Recycled fibers such as cuproammonium fibers, and natural fibers such as cotton, can use non-woven fabrics obtained by appropriate processing methods such as spunbonding, thermobonding, meltblown, and needle punching, but especially to prevent stuffiness. A non-woven fabric with excellent air permeability that suppresses the mass per unit area can be used. Furthermore, in order to prevent the permeation of urine and the like, prevent skin inflammation and improve the touch (dryness) of the skin, it is desirable to use a silicone-based, paraffin-metal-based, alkyl chromium chloride-based water repellent, etc. Water treatment non-woven fabric, used as the corrugated sheet 15.

(Example of structure of exterior body) The exterior body 20, as shown in FIGS. 4 to 6, is formed into a two-layer structure composed of a pressing piece 20A and a back sheet 20B, respectively. The pressing piece 20A and the back sheet 20B are made of non-woven fabric or the like. Between the pressing piece 20A and the back piece 20B, and between the back piece 20B at the edge of the waist opening to the inner side of the folded portion 20C, the elastic members 24 to 26, 28 are arranged, and In the natural length state, the exterior body 20 is contracted by the contraction force of the elastic member to impart stretchability to the exterior body 20. In the planar shape, the concave leg girth lines 29 are formed to form leg openings on both sides of the middle, so that the whole is formed into a roughly hourglass shape.

In the illustrated form of the exterior body 20, as an elastic member, in the expanded shape shown in FIGS. 1 and 2, there is a waist elastic member 24 arranged in the vicinity of the waist opening 23, and on the front body F and the back body B The lower waist elastic members 25 are arranged along the width direction at intervals in the longitudinal direction, and each of the front body F and the back body B is provided with a plural number different from the group of the lower waist elastic members 25 The curved elastic members 26, 28; the curved elastic members 26, 28 are bent to extend from the side seal 21 on one side toward the crotch along the leg opening on one side, and extend across the crotch and along the leg opening on the other side until The pattern of the other side seal part 21 does not cross each other but is arrange|positioned at intervals. These elastic members 24 to 26, 28 are fixed in a state of being stretched to a predetermined elongation rate along the respective extending directions. In addition, in this exterior body 20, it is not necessary to provide an elastic member which continues from the side seal part of the front body F to the side seal part of the back body B along the leg line 29. As shown in FIG.

The waist elastic member 24 is formed by joining the front body F and the back body B to the side seal 21, and is arranged at intervals in the longitudinal direction near the edge of the waist opening. A member which imparts elasticity to the waist of the body so as to wear the diaper on the body. The waist elastic member 24 uses a rubber thread in the example shown in the figure, but for example, a belt-shaped elastic member may be used. In addition, the waist elastic member 24 of the illustrated form is sandwiched between the non-woven fabrics of the folded portion 25C of the back sheet 20B in the waist, but it may be sandwiched between the pressing piece 20A and the back sheet 20B.

The lower waist elastic member 25 is an elongated elastic member such as a rubber thread arranged at intervals in the longitudinal direction in the range of the front and rear direction with the side seal 21, which respectively affect the waist circumference of the front body F and the back body B. Partially imparts stretchability to make the diaper fit tightly to the body. In addition, the boundary line between the waist elastic member 24 and the lower waist elastic member 25 does not need to be clear. For example, in the front body F and the back body B, among the elastic members arranged at intervals in the longitudinal direction in the width direction, even if the number cannot be specified, as long as a few on the upper side function as waist elastic members, The remaining elastic member may function as a lower waist elastic member.

In the back body B, the back side curved elastic member 26 provided separately from the lower waist elastic member 25 is an elongated elastic member such as a rubber thread, and is arranged along a predetermined curve. The back side bending elastic member 26 may also be one but preferably plural. In the example shown in the figure, there are 4 elongated elastic members such as rubber threads. These back side bending elastic members 26 are arranged at intervals without crossing each other. . In this back-side bending elastic member 26, instead of arranging two or three elastic members at close intervals in a bundle, they are separated by an interval of about 3-20 mm so as to form a predetermined expansion and contraction area. At intervals of about 6 to 16 mm, 3 or more are arranged, preferably 4 or more.

In the front body F of the exterior body 20, the abdominal bending elastic member 28 provided separately from the lower waist elastic member 25 is an elongated elastic member such as a rubber thread, and is arranged along a predetermined curve. The ventral curved elastic members 28 may also be one but preferably plural. In the example shown in the figure, there are four filamentous elastic members. These ventral curved elastic members 28 are arranged at intervals without intersecting each other. In this ventral bending elastic member 28, instead of arranging two or three elastic members in a bundle at close intervals, they are separated by an interval of about 3 to 20 mm so as to form a predetermined expansion and contraction area. It is preferably At intervals of about 6 to 16 mm, 3 or more are arranged, preferably 4 or more.

In addition, as shown in FIG. 2, the lower waist elastic member 25 and the bending elastic members 26, 28 arranged in the front body F and the back body B can be continuously fixed to the exterior body 20 at the time of manufacture. The cutting pattern of, carefully cuts the middle part in the width direction of the part overlapping with the absorbent body 18 (the part enclosed by the two-dot chain line in the figure) to create a non-shrinkable part where the shrinkage force does not work, and is more than this non-shrinkable part The part extending further to the side constitutes a contraction part (that is, the remaining continuous part of the lower waist elastic member 25 and the curved elastic members 26, 28) where the contraction force acts. Thereby, it is possible to prevent unnecessary shrinkage in the width direction of the inner body (especially the absorber 18). Of course, the lower waist elastic member 25 and the bending elastic members 26 and 28 can also be arranged continuously across the inner body 10.

The exterior body 20 described above can be manufactured by, for example, the techniques described in Japanese Patent Application Laid-Open No. 4-28363 and Japanese Patent Application Laid-Open No. 11-332913. In addition, the bending elastic members 26, 28 are cut in the inner body 10 to make the elastic members 26, 28 discontinuous. Japanese Patent Application Publication No. 2002-35029, Japanese Patent Application Publication No. 2002-178428, and The cutting method described in Japanese Patent Application Laid-Open No. 2002-273808.

Unlike the example shown in the figure, the curved elastic members 26 and 28 may be provided on either the front body F or the back body B only. In addition, when the curved elastic members 26 and 28 are provided on both the front body F and the back body B, part or all of the group of the curved elastic members 28 arranged on the front body F and the group of the curved elastic members 28 arranged on the rear body F can also be used. Part or all of the group of the curved elastic members 26 of the body B is in a cross shape (not shown), but it is suitable for the group of the curved elastic members 28 arranged on the front body F as shown in the example, and is arranged The groups of the curved elastic members 26 on the back body B do not cross each other, and are separated in the longitudinal direction at the center part in the front-rear direction, especially at a position slightly offset from the front body F.

The elongation rate of the elastic members 24 to 26 and 28 during fixation can be appropriately specified: for normal adult use, the waist elastic member 24 can be set to about 160 to 320%, and the lower waist elastic member 25 can be 160 to 320 %, and the bending elastic members 26 and 28 are about 230 to 320%.

(Mask sheet) 1 and 4, in order to cover the front end and rear end of the inner body 10 installed on the inner surface of the outer body 20, and to prevent the front edge and rear of the inner body 10 For the leakage of the edge, mask sheets 50 and 60 may also be provided. If the illustrated form is described in further detail, the front mask piece 50 extends from the inner surface of the folded portion 20C at the waist side end among the inner surface of the front body F to the front end portion of the inner body 10 across the entire width direction. Overlapping position; the rear mask sheet 60 extends from the inner surface of the folded back portion 20C at the waist side end of the inner surface of the back body B to the position overlapping with the rear end of the inner body 10 across the entire width direction . The folded-back portion 20C is extended to a portion overlapping the inner body 10, and the folded-back portion 20C is configured by folding the outer body 20 back on the inner surface, and can also form a portion equivalent to the mask sheets 50 and 60 of the illustrated example.

(Absorber) The absorber may have a single-layer structure or a multilayer structure. The absorbent body 18 is a member containing superabsorbent polymer particles, preferably a mixed accumulation assembly of pulp fibers and superabsorbent polymer particles. The absorbent body 18 can be packaged with a packaging sheet 14 having liquid permeability and liquid retention properties such as crepe paper in order to maintain the shape, polymer, and the like.

As the superabsorbent polymer particles, the particles used in such absorbent articles can be used directly, for example, using a 500μm standard sieve (JIS Z8801-1: 2006) to screen (5 minutes vibrating sieve) and on the sieve The ratio of remaining particles is preferably 30% by weight or less, and a 180μm standard sieve (JIS Z8801-1: 2006) is used for sieving (5 minutes vibrating sieve) and the ratio of remaining particles on the sieve is preferably 60 More than weight%.

Although there are no particular limitations on the superabsorbent polymer particles, superabsorbent polymer particles having a water absorption speed of 35 to 60 seconds and a water absorption amount of 50 to 70 g/g can be suitably used. As superabsorbent polymer particles, starch-based, cellulose-based, synthetic polymer-based, etc. can be used, and starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and carboxymethyl can be suitably used. Cross-linked products of base cellulose sodium, acrylic acid (salt) polymer, etc. The mass per unit area of the superabsorbent polymer particles can be appropriately specified in accordance with the absorption amount required by the product. Although it cannot be generalized, it can be set to 100 to 350 g/m ² .

The overall shape of the absorber 18 can be appropriately defined, and it can also be individually made into a rectangular shape, and it is preferably formed in an hourglass shape having a crotch portion with a narrower width than the front and rear sides of the gathered portion 13. The size of the gathered portion 13 can be appropriately determined, and the width of the narrowest part can be set to about 40 to 60% of the full width of the absorber 18.

(Side seal part) In one example, covering the outer body 20 of the front body F and the back body B, the ventral side is the ventral outer body, the back side is the dorsal outer body, and the width of the ventral outer body is Both side portions and both side portions in the width direction of the back exterior body are overlapped and welded to form a pair of side seal portions 21. At one end of the side seal 21 in the direction orthogonal to the width direction (up and down direction), a leg opening is formed by the ventral exterior body, the dorsal exterior body, and the interior body. At the other end, the leg opening is formed by The ventral exterior body and the back exterior body form a waist opening. The side seal 21 has a first seal pattern and a second seal pattern. The first seal pattern is configured by arranging a plurality of horizontally elongated first seal portions 71 at predetermined intervals in the vertical direction. The sealing pattern is configured by arranging the second sealing portion 72 at each of the aforementioned predetermined intervals. The first seal portion 71 and the second seal portion 72 are welded to the ventral exterior body and the back exterior body, so the side seal portion on the ventral exterior body side and the side seal on the back exterior body side In the sealing part, the side sealing part 21 welded cannot be peeled off.

In the side seal portion 21 of Patent Document 2, a plurality of seal portions are arranged at intervals in the longitudinal direction. However, in this state, if the side seal portion 21 is to be split in the vertical direction, the exterior body at the same interval, For example, it may crack on the outside in the width direction, and it may not easily continue to crack afterwards. However, in the side seal 21 shown below, the side seal 21 shown in FIG. 11 can be continuously split from the waist opening to the leg opening, and the absorbent article can be easily removed.

For example, suppose that a caregiver uses his right hand and left hand to grasp the vicinity of the side seal in each of the ventral exterior body and the back exterior body provided with the side seal portion 21, and keep the right and left hands away from each other. An external force is applied to the side seal portion 21 in the direction. In this way, for example, the inner side in the width direction of the absorbent article in the first sealing portion 71, followed by the inner side in the width direction of the absorbent article in the second sealing portion 72, and then the absorbent article in the first sealing portion 71 The inner side in the width direction, plus the inner side in the width direction of the absorbent article in the second sealing part 72, will be split sequentially, that is, the first sealing part 71 and the second sealing part 72 are in the absorbent article. The inner side in the width direction gradually splits in the up and down direction. The inventors discovered that this type of cracking is that the vicinity of the welded part is easy to crack, and the parts other than the vicinity of the welded part are not easily cracked.

The width 21W of the side seal portion may be 2.0 to 7.0 mm, for example, and more preferably 4.0 to 5.0 mm. If it is shorter than 2.0 mm, it is difficult to weld the ventral exterior body and the back exterior body, and if it is longer than 7.0 mm, the area of the side seal portion is too large.

The first sealing portion 71 of the first seal pattern may be a horizontally elongated shape, and the horizontally elongated shape includes, for example, a horizontally rectangular shape, a horizontally rectangular shape with recessed ends, and a horizontally oblong shape. In addition, shapes such as a horizontally rectangular shape formed at intervals in the horizontal direction, a horizontally rectangular shape with a recessed end portion, and a horizontally oblong shape are also included in this horizontally elongated shape. The length 71L in the longitudinal direction of the first sealing portion 71 may be 2.0 to 5.0 mm, and the length 71W in the short direction may be 0.2 to 1.0 mm.

The second sealing portion 72 of the second sealing pattern may also have a circular shape, a longitudinally elongated shape, a longitudinally rectangular shape, a longitudinally rectangular shape with recessed ends, or a longitudinally oblong shape. In addition, the shape of a longitudinally rectangular shape formed at intervals in the longitudinal direction, a longitudinally rectangular shape with a recessed end portion, and a longitudinally oblong shape may be a longitudinally elongated dashed line shape. In addition, the length 72L in the longitudinal direction of the second sealing portion 72 may be 0.5 to 1.5 mm, and the length 72W in the shorter direction may be 0.2 to 1.0 mm.

The interval 71S between the first seal portions 71 of the first seal pattern may be 1.5 to 4.0 mm. If it exceeds 4.0 mm, the portion where the ventral exterior body and the back exterior body are not welded increases, and the strength as the side seal portion 21 is too low. If it is less than 1.5 mm, there are too many welded parts, and the side seal portion 21 becomes hard, which may impair the flexibility of the absorbent article. In addition, the interval 71N between the first seal portion 71 of the first seal pattern and the second seal portion 72 of the second seal pattern may be at least 0.5 mm or more. If it is less than 0.5mm, the interval part may be accidentally cracked.

It is preferable that the second seal pattern is located in a form in which the first seal pattern is located closer to the center than the inner end in the width direction. For example, the distance 71M between the inner end of the first seal portion 71 of the first seal pattern and the inner end of the second seal portion 72 of the second seal pattern may be 0.2 to 2.5 mm. In addition, being closer to the center means that, for example, when the first seal pattern is divided into three equal parts in the longitudinal direction, it can be set to the outer end in the width direction in the center portion.

Assuming that the second seal pattern is superimposed on the line connecting the widthwise inner ends of each of the first seal portions 71 in the first seal pattern, and the widthwise inner ends of the second seal pattern are connected, when When the absorbent article is worn, the side seal portion 21 tends to split along the inner end in the width direction of each of the first seal pattern and the second seal pattern, which is not preferable.

The ratio of the length 71S of the predetermined interval between the first sealing parts 71 to the length 72L in the direction orthogonal to the width direction in the second sealing part 72 is 1.5:1.0 to 3.0:1.0. When the person grasps the outer body and slides the absorbent article until the crotch is worn for a person, the side seal 21 is continuous and not easy to split, so it is preferable. Specifically, the sealing part 72 arranged in the interval between the two sealing parts 71, 71, for example, even if it is biased toward one of these sealing parts 71, 71, it will be far away from the other sealing part 71, so even if it is side sealed One part of the part 21 is cracked, and the cracking will not continue.

It is preferable that the length 71L of the longitudinal direction of the 1st sealing part 71 is longer than the length 72L of the longitudinal direction of the 2nd sealing part 72. In addition, the ratio of the length 71L in the longitudinal direction of the first sealing portion 71 to the length 72L in the longitudinal direction of the second sealing portion 72 can be adjusted appropriately, for example, it can also be set to 1.0:0.1 to 1.0:0.5, and more preferably It is set to 1.0: 0.2 to 1.0: 0.3. Also, it may be 7.5:1 to 2.5:1. When the length 71L of the first sealing part and the length 72L of the second sealing part are the same degree, for example, if the length 71L of the first sealing part is relatively long, the length 72L of the second sealing part is also relatively long. As a result, the strength of the side seal portion 21 is weakened. Furthermore, if the length 71L of the first sealing portion 71 is relatively short, the length 72L of the second sealing portion is also relatively short, so that the total area of the sealing portion is small, and therefore the strength of the side sealing portion 21 is weakened.

The second sealing portion 72 is formed by a method of thermal welding or ultrasonic welding as shown in FIG. 10. The second sealing portion 72 may be formed by forming a thinner thickness than the vicinity of the sealing portion (FIG. 10(a)), or may be formed by forming a through hole (FIG. 10(b)). The same applies to the first sealing portion 71, and the thickness may be formed to be thin, or the through hole may be formed. The thickness D1 of the sealing parts 71 and 72 is preferably 0.30 times or less compared to the thickness D2 in the vicinity of the sealing part, since the welding becomes stronger and the sealing parts 71 and 72 have high strength.

<Other embodiment 1> In the second seal pattern, each of the second seal portions 72 on the leg opening side is located at the center of the width direction in the first seal pattern, so that each of the second seal portions 72 is provided on the side The seal 21 is not easy to break due to the daily actions of the wearer while wearing it, so it is preferable. In addition, when the side seal 21 is to be torn in the case of removing the absorbent article, the second seal 72 is located at the center, so for example, the exterior body does not exceed the second seal 72 and does not go outward in the width direction. Split, the result is continuous splitting in the up and down direction.

At both ends in the width direction of the exterior body, from the waist opening to the leg opening, side seals 21 are provided, specifically, the first seal pattern and the second seal pattern are provided. The leg opening side in the second seal pattern refers to, for example, the amount that can be set to 20-25 portions from the second seal portion 72 located closest to the leg opening in the second seal pattern to the waist opening direction. The group of the second sealing portion 72. In addition, the leg opening side in the second seal pattern means that it can also be set to 0.15 to 0.30 times the total length from the lower end (leg opening) of the side seal 21 in the upward direction to the vertical direction of the side seal 21 The group of the second sealing portion 72 in the range.

Furthermore, when the outer body 20 is covered with the mask sheets 50 and 60, the leg opening side in the second seal pattern means that it can also be set in the side seal portion 21 from the leg opening to the mask sheet The range of the lower end edge of 50 (that is, the range in which the mask sheet 50 is not arranged in the exterior body 20), and the range from the leg opening to the lower end of the mask sheet 60 (that is, the outer In the housing 20, there is no area where the mask sheet 60 is arranged). In addition, when the thickness of the lower part in the vertical direction in the ventral exterior body or the back exterior body is relatively thin, the leg opening side in the second seal pattern means that it can also be the side The thickness of the sealing part 21 is relatively thin. Here, the lower part in the vertical direction among the abdominal exterior body or the back exterior body can be referred to as a portion where the mask sheet is not arranged, for example. The part of the side seal 21 where the mask sheets 50 and 60 are not arranged, or the part where the thickness of the exterior body is relatively thin, has relatively low strength. Therefore, in order to prevent tearing when wearing the absorbent article, the second sealing part arranged in these parts may be located in the center part of the width direction of the first sealing part, as described later, and set diagonally as much as possible. Do not make the strength too low. In addition, if the sealing parts 71, 72 are too close to each other or even overlap, the strength of the sealing parts 71, 72 becomes low, and when the absorbent article is worn, it may be split along the first and second sealing patterns. .

The central part in the width direction in the first seal pattern refers to, for example, the part in the center where the longitudinal direction of the first seal pattern is divided into three equal parts, or the longitudinal direction of the first seal pattern After being divided into quarters, the parts after removing the ends on both sides.

<Other embodiment 2> As shown in FIG. 9, with respect to the longitudinal direction of the first sealing portion 71, the longitudinal direction of each of the second sealing portions 72 on the leg opening side in the second sealing pattern is preferably diagonal form. In this form, even if the wearer moves the base of the thigh freely, the side seal 21 on the side of the leg opening is unlikely to be split. In this form, the angle θ between the longitudinal direction of the first sealing portion 71 and the longitudinal direction of the second sealing portion 72 is 30∘～90∘, preferably 30∘～60∘, more preferably 40∘ ~50∘. If it is less than 30∘ or more than 90∘, when the side seal 21 is to be split, the split direction is guided by the diagonally arranged second sealing portion 72, which may further go outward in the width direction of the absorbent article. The crack may be broken, and the crack may be interrupted at the second sealing portion 72 arranged diagonally of the side seal portion 21.

<Other embodiment 3> As shown in FIG. 8, it can be revealed that the first sealing portion 71 has a horizontal dotted line shape (FIG. 8( c )), and the second sealing portion 72 has a vertical dotted line shape (FIG. 8( b )).

<Other embodiment 4> All of the sealing parts of the second seal pattern are located in a form in which the inner end in the width direction of the first seal pattern is located closer to the center, so that the inner end of the first seal and the second seal Separated, and it is not easy to split when wearing, so it is better. <Explanation of terms in the specification> Unless otherwise stated in the specification, the following terms in the specification have the following meanings.・The "front-rear direction" refers to the direction indicated by the symbol LD in the figure (longitudinal direction), and the "width direction" refers to the direction (left-right direction) indicated by the symbol WD in the figure.・"Up and down direction" refers to the direction (vertical direction) shown by the symbol VE in Figure 3 in a pants-type disposable diaper. Specifically, it refers to the straight line connecting the center of the waist opening and the center of the inner body In the direction, the pants-type disposable diaper is formed with side seals to form a waist opening and a pair of left and right leg openings.・"Expanded state" refers to a state that is flat and unfolded without shrinking or slack.・"Elongation" refers to the value when the natural length is set to 100%. For example, the elongation of 200% means the same meaning that the elongation is 2 times.・"Mass per unit area" is measured as follows. After pre-drying the sample or test piece, place it in a test room or device in a standard state (the temperature of the test site is 23±1°C, and the relative humidity is 50±2%) to make it a constant state. Preliminary drying refers to making the sample or test piece constant in an environment with a temperature of 100°C. In addition, for fibers with a legal moisture content of 0.0%, preliminary drying is not required. Using a template (100 mm×100 mm) for sample collection, a sample with a size of 100 mm×100 mm was cut out from the test piece in a state of constant weight. Measure the weight of the sample and multiply it by a factor of 100 to calculate the weight per square meter as the mass per unit area.・"Thickness" is automatically measured with an automatic thickness measuring device (KES-G5 portable compression tester) under the conditions of a load of 0.098N/cm ² and a pressurized area of 2 cm ² .・"Water Absorption" is measured in accordance with JIS K7223-1996 "Test Method for Water Absorption of Super Absorbent Resin".・"Water absorption rate" is the "time to end point" when JIS K 7224-1996 "Test Method for Water Absorption Rate of Super Absorbent Resins" is carried out using 2g of super absorbent polymer and 50g of physiological saline.・In the absence of a description of the environmental conditions in the test or measurement, the test or measurement is in a test room or device in a standard state (the test site is at a temperature of 23±1°C and a relative humidity of 50±2%) get on.・As long as there is no special description, the size of each part refers to the size in the unfolded state and not in the natural length state.

[Industrial availability] The present invention can be used in all absorbent articles of pant-type disposable diapers like the above-mentioned examples.

10: Inner body 11: Top piece 12: Liquid-impermeable tablets 13: Folding part 14: Packaging film 15: pleated sheet 16: pleated elastic member 18: Absorber 20: Exterior body 20c: Turn-back part 21: Side seal 21W: The width of the side seal 24: Waist elastic member 25: Elastic member under the waist 26, 28: Bending elastic members 29: Leg circumference B: back BS: Three-dimensional wrinkles F: Predecessor 71: The first sealing part 71L: The length of the first seal in the longitudinal direction 71W: The length of the short side of the first seal 71N: The interval between the first sealing part and the second sealing part 71M: The distance between the inner end of the first seal and the inner end of the second seal 71S: The length of the specified interval between the first sealing parts 72: The second sealing part 72L: The length of the second seal in the longitudinal direction 72W: The length of the short side of the second seal

Fig. 1 is a plan view (inner side) of the pant-type disposable diaper in an expanded state. Fig. 2 is a plan view (outer side) of the pant-type disposable diaper in an unfolded state. Fig. 3 is a perspective view of the wearing state of the pants-type disposable diaper. Fig. 4 is a cross-sectional view taken along line 4-4 in Fig. 1. Fig. 5 is a cross-sectional view taken along line 5-5 in Fig. 1. Fig. 6 is a cross-sectional view taken along line 6-6 in Fig. 1. Fig. 7 is an explanatory diagram of a side seal. Fig. 8 is an explanatory diagram of a side seal. Fig. 9 is an explanatory diagram of a side seal. Fig. 10 is a cross-sectional view taken along line x-x in Fig. 7. Fig. 11 is a cross-sectional view of the pants-type disposable diaper after the side seals are split.

Domestic deposit information (please note in order of deposit institution, date and number) no

Foreign hosting information (please note in the order of hosting country, institution, date, and number) no

21: Side seal

21W: The width of the side seal

71: The first sealing part

71L: The length of the first seal in the longitudinal direction

71W: The length of the short side of the first seal

71N: The interval between the first sealing part and the second sealing part

71M: The distance between the inner end of the first seal and the inner end of the second seal

71S: The length of the specified interval between the first sealing parts

72: The second sealing part

72L: The length of the second seal in the longitudinal direction

72W: The length of the short side of the second seal

Claims (7)

An absorbent article, characterized in that it has: The inner body, the ventral outer body at one end of the longitudinal direction of the inner body, and the back outer body at the other end; A pair of side seals, which are formed by superimposing and welding the two sides in the width direction of the aforesaid ventral exterior body and the two sides in the width direction of the back exterior body; and, The leg opening is formed by the ventral exterior body, the back exterior body, and the interior body at one end of the side seal portion that is orthogonal to the width direction; Wherein, the side seal portion has a first seal pattern and a second seal pattern, and the first seal pattern has a plurality of horizontally elongated first seals arranged at predetermined intervals in a direction orthogonal to the width direction. The second sealing pattern is configured by arranging second sealing portions at each of the aforementioned predetermined intervals; In addition, the second seal pattern is located closer to the center than the inner end in the width direction of the first seal pattern, The first sealing portion and the second sealing portion are separated in a direction orthogonal to the width direction. The absorbent article according to claim 1, wherein the ratio of the length of the predetermined interval between the first sealing parts to the length of the second sealing part in the direction orthogonal to the width direction is 1.5 : 1.0～3.0: 1.0. The absorbent article according to claim 1 or 2, wherein each of the second sealing portions is longitudinally elongated. The absorbent article according to any one of claims 1 to 3, wherein each of the second seal portions on the leg opening side among the second seal portions is located in the first seal portion The central part of the width direction. The absorbent article according to any one of claims 1 to 4, wherein, with respect to the longitudinal direction of the first seal portion, the second seal on the leg opening side in the second seal pattern The longitudinal direction of each part is oblique. The absorbent article according to any one of claims 1 to 5, wherein each of the second seal portions on the leg opening side in the second seal pattern is in the shape of a longitudinally long dotted line. The absorbent article according to any one of claims 1 to 6, wherein the length of the first sealing portion in the longitudinal direction is 2.0 to 5.0 mm; The ratio of the length of the longitudinal direction of the said 1st sealing part to the length of the longitudinal direction of the said 2nd sealing part is 1.0:0.1-1.0:0.5.

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