JP3737709B2 - Pants-type disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pants-type disposable diaper that absorbs and holds excrement.
[0002]
[Prior art]
Consists of a front sheet made of a heat-fusible and liquid-permeable fiber nonwoven fabric, a back sheet made of a heat-meltable and substantially liquid-impervious fiber nonwoven fabric, and a liquid-absorbent core interposed between the sheets The two sides that overlap in the shape of a palm in the front and rear waist area are connected via a plurality of heat-sealing wires that are intermittently arranged in the vertical direction near the outer edges of the side parts, and the waist opening and a pair of leg openings A pants-type disposable diaper in which is defined is known.
[0003]
The diaper in a worn state can be removed by tearing both sides of the front / rear waist area vertically from the waist opening to the leg opening along the heat-bonding line, separating the front / rear waist area back and forth be able to. Such diapers are disclosed in Japanese Utility Model Laid-Open Nos. 7-34814, 10-80, and 10-81.
[0004]
[Problems to be solved by the invention]
In the diapers disclosed in these publications, when the fibers forming the top sheet and the back sheet are oriented in the waist direction of the diaper, when tearing both sides of the front and back waist area in the longitudinal direction, In some cases, it does not run in the longitudinal direction, and it runs in the trunk direction (fiber orientation direction) toward the outer edges of both sides. In a diaper, when the tear line that runs around the trunk reaches the outer edge, the tearing on both sides ends halfway, and then the sides of the tear line reach the outer edge. It must be troublesome.
[0005]
The problem of the present invention is that even if the tear line runs in the direction around the trunk toward the outer edges of both sides, it can be prevented from reaching the outer edges, and both sides can be torn smoothly in the vertical direction. An object of the present invention is to provide a pants-type disposable diaper that can be used.
[0006]
[Means for Solving the Problems]
The premise of the present invention for solving the above-mentioned problems is that the front waist region and the back waist region that face each other, and a crotch region positioned between the waist regions, the front and back waist regions overlap each other. A pants-type disposable diaper in which both side portions are connected via a joint region extending in the vertical direction and a waist opening and a pair of leg openings are defined.
[0007]
As a feature of the present invention based on this premise, the joint area extends in the vicinity of the outer periphery of the both side portions in the waist circumference direction, and a plurality of joint areas are arranged in the vertical direction between the waist circumference opening and the leg circumference opening. A plurality of first regions where the first heat-sealing lines of the strips are formed, and a plurality of regions adjacent to the inside of the first heat-sealing wires that are intermittently arranged in the longitudinal direction and located in the upper and central portions of the joining region consists of a second region in which the second heat Chakusen the strip is formed, the second heat Chakusen is, extends into the longitudinal direction, at least the first heat Chakusen adjacent to said longitudinal direction It has a vertical dimension extending over two strips, and at the upper part and the central part of the joining area, the both side parts can be separated in the longitudinal direction along the second heat-sealing line, and the lower part of the joining area Then, the two side portions can be separated in the longitudinal direction along the first heat-sealing line.
[0008]
As an example of an embodiment of the present invention, the size of the first heat-sealing wire located at the lower part of the joining region is measured in the waist circumference direction at the first heat located at the upper part and the central part of the joining region. The lower end of the second heat-sealing line and the inner end of the first heat-sealing line adjacent to the lower end of the second heat-sealing line, which are longer than those in the circumferential direction of the fusing line and located at the lowermost center of the joining region, are substantially Connected.
[0009]
As another example of the embodiment of the present invention, both side portions in at least one of the front and rear waist regions are bent inward in the waist direction of the diaper, and are formed at the upper and middle portions of the joint region. The first heat-sealing line located and a part of the first heat-sealing line located in the lower part of the joining area extend to the bent portions on both sides, and the second heat-sealing line is It extends near the inside of the bent part.
[0010]
As another example of the embodiment of the present invention, the second heat-sealing line extends in a substantially V shape or a substantially C shape toward the waist of the diaper.
[0011]
As another example of the embodiment of the present invention, the second heat-sealing line extends substantially in an arc toward the waist of the diaper.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The details of the pants-type disposable diaper according to the present invention will be described below with reference to the accompanying drawings.
[0013]
1 and 2 are a perspective view of the diaper 1A partially cut away and a partial perspective view of the diaper 1A. FIG. 3 shows the side portions 7 and 8 from the waist opening 5 to the leg opening 6. It is a partial perspective view of diaper 1A shown in the state where it was torn in the vertical direction. In FIG. 1, the direction around the trunk is indicated by an arrow X, and the vertical direction is indicated by an arrow Y. The inner surface of the top sheet 2 and the back sheet 3 refers to a surface that faces the core 4, and the outer surfaces of the sheets 2 and 3 refer to surfaces that do not face the core 4.
[0014]
The diaper 1 </ b> A is composed of a heat-melt and liquid-permeable top sheet 2, a heat-melt and liquid-impervious back sheet 3, and a liquid-absorbent core 4 interposed between the sheets 2 and 3. ing. The core 4 is bonded to at least one inner surface of the top sheet 2 and the back sheet 3.
[0015]
The diaper 1 </ b> A has a front waistline region 18 and a back waistline region 20 that face each other, and a crotch region 19 that is positioned between the front and back waistline regions 18, 20. The diaper 1 </ b> A has a waist opening 5 and a pair of leg openings 6.
[0016]
In the diaper 1 </ b> A, both side portions 7 and 8 of the front and rear waist regions 18 and 20 are overlapped with each other, and the side portions 7 and 8 are fixed via a joining region 11 extending in the vertical direction. Both side portions 7 and 8 of the front and rear waist regions 18 and 20 are formed of a top sheet 2 and a back sheet 3 that extend outward from the both side edges of the core 4 in the waist direction. For fixing these side portions 7 and 8, fusion means such as heat sealing or ultrasonic bonding is used.
[0017]
The joining area 11 includes a first heat-sealing line forming area 13 (first area) in which a plurality of first heat-sealing lines 12 are arranged in the vertical direction between the trunk periphery opening 5 and the leg periphery opening 6. 1 region), and a plurality of second heat-sealing wires 14 that are located in the upper portion 11a and the central portion 11b of the joining region 11 and are intermittently arranged in the vicinity of the inside of the first heat-welding wire 12 in the vertical direction. The second heat-sealing line forming region 15 (second region) is formed. In the joining area 11, the lower end 14a of the second heat-sealing wire 14 located at the lowermost part of the center portion 11b and the inner end 12a of the first heat-sealing wire 12 adjacent thereto are close to each other. , 14 are substantially connected to the inner end 12a and the lower end 14a.
[0018]
The first heat-sealing line 12 extends in the vicinity of the outer edges 9 and 10 of the side portions 7 and 8 in the circumferential direction. The dimension L2 of the first heat-sealing line 12 located in the lower portion 11c of the joining area 11 in the waist direction is the waist-direction of the first heat-sealing line 12 located in the upper part 11a and the central part 11b of the joining area 11. Longer than that. It is preferable that the dimension L1 of the 1st heat-fusion line 12 located in the upper part 11a and the center part 11b of the joining area | region 11 exists in the range of 2-5 mm, and is located in the lower part 11c of the joining area | region 11. It is preferable that the dimension L2 of the 1st heat sealing | fusion line 12 of the trunk periphery direction exists in the range of 5-10 mm. It is preferable that the longitudinal distance L3 between the first heat-sealing wires 10 adjacent to each other is in the range of 0.05 to 1 mm.
[0019]
The second heat-sealing line 14 extends in the vertical direction so as to draw a substantially square shape toward the waist. The second heat-sealing line 14 has a vertical dimension L4 that extends over substantially four strips of the first heat-sealing line 12 adjacent in the vertical direction. The 2nd heat-sealing line 14 should just have the vertical dimension L4 which straddles at least 2 stripes of the 1st heat-sealing line 12 adjacent to a vertical direction, and the vertical dimension L4 exists in the range of 2-15 mm. It is preferable. It is preferable that the vertical separation dimension L5 of the second heat-sealing wires 14 adjacent to each other is in the range of 0.3 to 2 mm. The second heat fusion line 14 located in the upper part 11a of the joining region 11 preferably has an opening angle θ1 in the range of 30 to 90 °, and the second heat fusion wire located in the central portion 11b of the joining region 11. The line 14 preferably has an opening angle θ2 in the range of 15 to 60 °.
[0020]
In the diaper 1 </ b> A, as shown in FIG. 3, by pulling the front and rear waist areas 19 and 20 in the direction of arrow Z, the side parts 7 and 8 are torn in the vertical direction from the waist opening 5 to the leg opening 6. be able to. In the upper part 11a and the center part 11b of the joining area | region 11, the side parts 7 and 8 are torn in a zigzag along the periphery of the 2nd heat-sealing line 14 connected to a vertical direction. In the lower part 11c of the joining area | region 11, the side parts 7 and 8 are torn along the periphery of the 1st heat-sealing line 12 located in a line with a vertical direction.
[0021]
In the joining region 11, the density per unit area of the first heat-sealing wire 12 is higher than that per unit area of the second heat-sealing wire 14, and the tear strength of the first heat-sealing wire forming region 13 is the first. 2 It is larger than that of the heat fusion line forming region 15. In the diaper 1 </ b> A, when the fibers and polymers forming the front and back sheets 2, 3 are oriented in the waist circumference direction, when tearing the side parts 7, 8, the tear line becomes the outer edge 9 of the side parts 7, 8. , 10 may be run. However, in the diaper 1 </ b> A, the tear line is prevented from running to the outer edges 9 and 10 by the first heat-sealing line forming region 13 having a high tear strength, and the tear line does not reach the outer edges 9 and 10.
[0022]
In the diaper 1 </ b> A, after the tear line toward the outer edges 9, 10 reaches the first heat-seal line forming region 13, the tear line is changed from the first heat-seal line formation region 13 to the second heat-seal line formation region 15. Then, the side portions 7 and 8 are torn along the second heat-sealing line 14 in the longitudinal direction again.
[0023]
In the diaper 1A, the lower end 14a of the second heat-sealing wire 14 located at the lowermost center portion 11b of the joining area 11 and the inner end 12a of the first heat-sealing wire 12 adjacent thereto are substantially connected. The tear line does not run from the lower end 14a toward the inner end 12a, and the tear line does not run inward in the waist direction of the diaper 1A. In the diaper 1 </ b> A, the side portions 7 and 8 can be smoothly torn in the longitudinal direction in the joining region 11.
[0024]
At the periphery of the waist opening 5, a plurality of waist elastic members 16 extending in the waist direction are interposed between the top sheet 2 and the back sheet 3, and are stretched on the inner surfaces of the sheets 2 and 3. It is attached. At the periphery of the leg opening 6, a plurality of leg elastic members 17 extending in the leg direction are interposed between the top sheet 2 and the back sheet 3, and are extended on the inner surfaces of the sheets 2 and 3. It is attached. In FIG. 1, the elastic members 16 and 17 are contracted, and a large number of gathers are formed along the periphery of the waist opening 5 and the periphery of the leg opening 6.
[0025]
4 and 5 are partial perspective views of diapers 1B and 1C showing another embodiment. The diaper 1B of FIG. 4 is different from that of FIG. 1 in that both side portions 7 of the front waist region 18 are bent inward in the waist direction in a state where the outer surfaces of the topsheet 2 are in contact with each other. There is. The diaper 1C of FIG. 5 is different from that of FIG. 1 in that both sides 7 and 8 of the front and rear waist regions 18 and 20 are folded inward in the waist direction with the outer surfaces of the topsheet 2 being in contact with each other. It is in the song.
[0026]
In these diapers 1 </ b> B and 1 </ b> C, the first heat fusion line 12 located in the upper part 11 a and the central part 11 b of the joining area 11 and a part of the first heat fusion line 12 located in the lower part 11 c of the joining area 11 are both sides. The second heat-sealing wire 14 extends in the vicinity of the inner side of the bent portion 21. The first heat-sealing wires 12 extend in the vicinity of the outer edges 9 and 10 in the circumferential direction and are closely arranged in the vertical direction. The second heat-sealing line 14 extends in the longitudinal direction so as to draw a substantially square shape toward the trunk periphery in the upper part 11a and the central part 11b of the joining region 11.
[0027]
In these diapers 1B and 1C, since the side portions 7 and 8 are fixed in a triple or quadruple state at the bent portion 21, the tear strength of the first heat-sealing line forming region 13 is shown in FIG. It can be made larger than that, and when the side portions 7 and 8 are torn, it is possible to reliably prevent the tear line from reaching the outer edges 9 and 10 in the first heat-sealing line forming region 13.
[0028]
In these diapers 1B and 1C, even if the tear line runs toward the outer edges 9 and 10, the tear line that has reached the first heat-seal line formation region 13 returns to the second heat-seal line formation region 15 again, It does not reach the outer edges 9,10.
[0029]
6 and 7 are partial perspective views of diapers 1D and 1E showing another embodiment. The diaper 1D in FIG. 6 is different from that in FIG. 1 in that the second heat-sealing line 14 in the upper part 11a and the central part 11b of the joining region 11 is formed in a vertical direction so as to form a substantially V-shape toward the waist. It is to extend to. The first heat-sealing wires 12 extend in the vicinity of the outer edges 9 and 10 in the circumferential direction and are closely arranged in the vertical direction. The vertical dimension of the second heat-sealing wire 14 is preferably in the range of 5 to 15 mm. The vertical separation distance of the second heat-sealing line 14, the opening angle of the second heat-sealing line 14 located in the upper part 11 a of the joining area 11, and the second heat-sealing line located in the central part 11 b of the joining area 11. The opening angle of 14 is preferably in the same range as that of FIG.
[0030]
In this diaper 1D, the side portions 7 and 8 are split in a zigzag manner along the peripheral edge of the second heat-sealing line 14 in the upper portion 11a and the central portion 11b of the joining region 11, and the lower portion of the joining region 11 is formed. In 11c, the side parts 7 and 8 are torn along the peripheral edge of the first heat-sealing line 12 aligned in the vertical direction.
[0031]
The diaper 1E of FIG. 7 is different from that of FIG. 1 in that the second heat-sealing line 14 is substantially inward in the waist direction and outward in the waist direction in the upper part 11a and the central part 11b of the joining region 11. In other words, it extends in the vertical direction so as to draw an arc. The first heat-sealing wires 12 extend in the vicinity of the outer edges 9 and 10 in the circumferential direction and are closely arranged in the vertical direction. The vertical dimension of the second heat-sealing wire 14 is preferably in the range of 5 to 15 mm. The vertical separation dimension of the second heat-sealing wire 14 is preferably in the same range as that of FIG.
[0032]
In this diaper 1E, the side parts 7 and 8 are torn along the peripheral edge of the second heat-sealing line 14 in the vertical direction at the upper part 11a and the central part 11b of the joining area 11, and the joining area 11 In the lower part 11c, the side parts 7 and 8 are torn along the peripheral edge of the first heat-sealing line 12 arranged in the vertical direction.
[0033]
In the illustrated diapers 1 </ b> A to 1 </ b> E, the second heat-sealing wire 14 is substantially arc-shaped or substantially V-shaped toward the waist, or substantially arcs toward the waist. Although extended, the 2nd heat-sealing line 14 may be extended substantially linearly to the vertical direction.
[0034]
For the topsheet 2, a hydrophilic fiber nonwoven fabric or a plastic film having a large number of fine holes can be used. For the back sheet 3, a hydrophobic fiber nonwoven fabric, a liquid-impervious plastic film, a two-layer nonwoven fabric obtained by superimposing the hydrophobic fiber nonwoven fabric, or a composite sheet in which a plastic film is fixed to the hydrophobic fiber nonwoven fabric is used. be able to.
[0035]
For the back sheet 3, a composite nonwoven fabric obtained by sandwiching a fiber nonwoven fabric by a melt blown method having high water resistance between fiber nonwoven fabrics by a spunbond method having high strength and high flexibility can also be used.
[0036]
As a nonwoven fabric, what was manufactured by each manufacturing method of a spunlace, a needle punch, a melt blown, a thermal bond, a spun bond, a chemical bond, and an air through can be used. As a constituent fiber of the nonwoven fabric, polyolefin-based, polyester-based, polyamide-based fibers, polyethylene / polypropylene, or core-sheath type composite fibers or parallel type composite fibers made of polyethylene / polyester can be used.
[0037]
The core 4 is a mixture of fluff pulp and superabsorbent polymer particles, or a mixture of fluff pulp, superabsorbent polymer particles and thermoplastic synthetic resin fibers, and is compressed to a required thickness. The core 4 is preferably entirely covered with tissue paper in order to prevent the polymer particles from falling off or out of shape. As the polymer particles, starch-based, cellulose-based or synthetic polymer-based particles can be used.
[0038]
【The invention's effect】
According to the pants-type disposable diaper according to the present invention, even when the tear line runs toward the outer edges of the sides when tearing the both sides of the front and rear waist area, the tear line runs to the outer edges. One region prevents it from reaching the outer edge. In this diaper, after the tear line toward the outer edge reaches the first region, the tear line returns from the first region to the second region, and both side portions again tear in the longitudinal direction along the second heat fusion line. go. In this diaper, both sides can be smoothly torn in the longitudinal direction in the joining region.
[0039]
In a diaper in which the lower end of the second heat fusion line located at the lowermost center of the joining area and the inner end of the first heat fusion line adjacent thereto are substantially connected, the tear line is the second heat fusion line. It runs from the lower end toward the inner end of the first heat-sealing line, and the tear line does not run inward around the waist of the diaper, and the two sides at the lower part of the joint area are torn smoothly. Can do.
[0040]
The first heat-sealing line located at the upper part and the central part of the joining area and the first part located at the lower part of the joining area are bent at both sides in at least one of the front and rear waist areas toward the inside of the waist of the diaper. In the diaper in which a part of one heat-sealing line extends to the bent portions on both sides, the diapers are fixed in a state where both sides are triple or quadrupled at the bent portions. The tear strength can be further increased, and the tear line can be reliably prevented from reaching the outer edges of the side portions in the first region.
[Brief description of the drawings]
FIG. 1 is a perspective view of a diaper partially cut away.
FIG. 2 is a partial perspective view of a diaper.
FIG. 3 is a partial perspective view of a diaper shown in a state in which a side portion is torn in a vertical direction.
FIG. 4 is a partial perspective view of a diaper showing another embodiment.
FIG. 5 is a partial perspective view of a diaper showing another embodiment.
FIG. 6 is a partial perspective view of a diaper showing another embodiment.
FIG. 7 is a partial perspective view of a diaper showing another embodiment.
[Explanation of symbols]
1A to 1E Pants-type disposable diaper 5 Trunk opening 6 Leg opening 7 Both sides 8 Both sides 9 Outer edge 10 Outer edge 11 Joint area 11a Upper part 11b Central part 11c Lower part 12 First heat-sealing line 12a Inner end 13 First heat Fusion wire forming region (first region)
14 Second heat fusion line 14a Lower end 15 Second heat fusion line formation region (second region)
18 Front waistline area 19 Inseam area 20 Rear waistline area 21 Folding part L4 Vertical dimension

Claims (5)

The front waist region and the rear waist region that face each other, and a crotch region positioned between the waist regions, and the two sides of the front and back waist regions that overlap each other are connected via a joint region that extends in the vertical direction. In a pants-type disposable diaper in which a waist opening and a pair of leg openings are defined,
The joint region includes a plurality of first heat-sealing lines extending in the trunk direction in the vicinity of the outer edges of the both side portions and closely arranged in the vertical direction between the trunk opening and the leg opening. A plurality of second heat-sealing lines, which are located in the formed first region, and at the upper and middle portions of the joining area, are arranged in the longitudinal direction intermittently in the vicinity of the inside of the first heat-sealing wire. consists of a formed second regions, the second heat Chakusen is, extends into the longitudinal direction, has a longitudinal dimension extending over at least two rows of said first heat Chakusen adjacent to said longitudinal direction ,
At the upper and middle portions of the joining area, the both side parts can be torn and separated in the longitudinal direction along the second heat-sealing line, and at the lower part of the joining area, the both side parts are separated from the first heat fusion line. The diaper characterized by being tearable and separable in the longitudinal direction along the fusion line.   The size of the first heat-sealing line located in the lower part of the joining area is larger than that of the first heat-welding line located in the upper part and the central part of the joining area. 2. A diaper that is long and substantially connects a lower end of the second heat-sealing line located at the lowermost center of the joining area and an inner end of the first heat-sealing line adjacent thereto. .   The first heat-sealing line and the joining area, which are located in the upper part and the center part of the joining area, in which both side parts in at least one of the front and rear waist areas are bent inwardly in the trunk surrounding direction. A part of the first heat-sealing line located at a lower portion of the first and second heat-sealing lines extends to a bent portion of the both side portions, and the second heat-sealing line extends to the inside of the bent portion. 2 diapers.   The diaper according to any one of claims 1 to 3, wherein the second heat-sealing line extends in a substantially V shape or a substantially C shape toward the circumference of the waist of the diaper.   The diaper according to any one of claims 1 to 3, wherein the second heat-sealing line extends substantially in an arc toward the waist of the diaper.

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