JP3625000B2 - Pants-type disposable diaper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the side edge portion of the ventral side portion and the side edge portion of the back side portion are welded and joined on the left and right sides to form a waist opening and a pair of leg openings, and the pair of leg openings More particularly, the present invention relates to a pants-type disposable diaper having an elastic member that forms a continuous gather around the entire circumference of the circumference, and more specifically, a pants-type disposable diaper that can be adapted to wearers of various body types. About.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as disposable diapers, unfolded disposable diapers using fastening means such as tape fasteners have been mainstream, but recently, pants-type disposable diapers have been put on the market. This pants-type disposable diaper is easy to put on and take off even in a standing position, and is useful for toilet training to promote infant `` diaper separation '' or for adults such as incontinence. ing.
[0003]
As shown in FIG. 4, the pants-type disposable diaper 100 welds and joins the side edges of the abdominal side A located on the abdomen side of the wearer and the back side part located on the dorsal side when worn. By doing so, a waist opening and a pair of leg openings are formed.
Further, in such a conventional pants-type disposable diaper 100, each of the peripheral edge portions 17 of the pair of leg openings is provided with an elastic member 118 such as a flat rubber, and is continuous over substantially the entire periphery of each peripheral edge portion 17. A gather is formed, and the peripheral edge 17 of the leg opening is deformed in accordance with the wearer. Thereby, in this conventional underpants-type disposable diaper 100, followability and adaptability are exhibited with respect to the active movement of the wearer, the difference in body shape between the wearers, etc., so that leakage of body fluids and the like is avoided. It has become.
[0004]
However, in the conventional pants-type disposable diapers as described above, there is a limit to the adaptability to the difference in body shape between wearers. There are problems such as the opening being too tight, the feeling of wearing being worsened, the wearer being marked, and the wearer's skin being damaged.
[0005]
Therefore, the objective of this invention is providing the underpants type disposable diaper which can be adapted to the wearer of various body types.
[0006]
[Means for Solving the Problems]
The present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the two sheets, and a ventral part positioned on the abdomen side of the wearer when worn, and a dorsal side And a crotch part located between the abdominal side part and the back side part, and the side edge part of the abdominal side part and the side edge part of the back side part are left and right. An elastic member that is welded and bonded to each other to form a waist opening and a pair of leg openings, and that forms a continuous gather on the peripheral edge of each of the pair of leg openings over substantially the entire circumference of the peripheral edge. In the pants-type disposable diaper, the welded joint between the side edge of the abdominal side and the side edge of the back side extends over a predetermined length from the opening edge of the leg opening. Weak connection with lower bonding strength than other parts Includes a part, the bonding strength of the weak joint Ri 300~800gf / 30mm der, the elastic member forming the gather the periphery of the leg opening, the weak junction of the fusion bonded part The above object is achieved by providing a pants-type disposable diaper characterized in that the ends are arranged so as to overlap each other .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a pants-type disposable diaper of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of a pants-type disposable diaper according to the present invention.
[0008]
The pants-type disposable diaper 10 of the present embodiment includes a liquid-permeable top sheet, a liquid-impermeable back sheet 12 and an absorbent body disposed between the two sheets, and the wearer's stomach side when worn. Is divided into a ventral side A located on the back side, a back side part located on the dorsal side, and a crotch C located between the ventral side part A and the dorsal side part. The side edge A ′ of the abdominal side A and the side edge of the back side are welded and joined to the left and right, respectively, to form a waist opening and a pair of leg openings. Further, the peripheral edge 16 of the waist opening and the peripheral edge 17 of the pair of leg openings are provided with elastic members (waist elastic member 18 and leg elastic member 19), and the peripheral edge 16 of the waist opening and the pair of legs are provided. A continuous gather is formed over substantially the entire circumference of each peripheral edge 17 of the leg opening.
[0009]
More specifically, each of the back sheet 12 and the absorbent body is formed in an hourglass cross-sectional shape in which the central portion in the longitudinal direction is confined. Further, the back sheet 12 is longer and wider than the absorbent body, and the top sheet and the back sheet 12 are bonded to each other at the periphery of the absorbent body, and the absorbent body is interposed between the two sheets. The top sheet may be formed longer and wider than the absorbent body in the same manner as the back sheet 12.
As the top sheet, the back sheet 12 and the absorbent body, those usually used for pants-type disposable diapers are used without particular limitation.
[0010]
The weld joint 15 extends outward from the absorber at the side edge A ′ of the ventral side A and the side edge of the back side by a technique such as heat sealing, high frequency sealing, and ultrasonic sealing. The back sheet 12 is welded between the left and right side edges. In addition, you may weld-process in the state which faced the surface sheet together with the surface sheet and the back surface sheet 12 which extended outward from the absorber.
[0011]
Four waist elastic members 18 are disposed in parallel to the opening edge 16 'of the waist opening in each of the ventral side A and the dorsal side, four on the ventral side A and the dorsal side. In addition, three leg elastic members 19 are arranged in parallel to the opening edge 17 'of the left and right leg openings from the abdominal side A through the crotch C to the back side. These leg elastic members 19 are arranged over a width of about 4 cm from the opening edge 17 ′ of the leg opening.
The waist elastic member 18 and the leg elastic member 19 have the same waist elastic member in the weld joint 15 when the side edge A ′ of the ventral side A and the side edge of the back side are welded and joined. 18 and the end portions of the same leg elastic member 19 are arranged so as to overlap each other, and are substantially continuous in the peripheral edge 16 of the waist opening and the peripheral edge 17 of the leg opening. The gather is to be formed.
[0012]
The waist elastic member 18 and the leg elastic member 19 are preferably made of natural rubber, polyurethane resin, foamed polyurethane resin or the like formed in a band shape. The waist elastic member 18 has an elongation rate of 30% and an elongation stress of 10 to 50 gf. The waist elastic member 18 is bonded and fixed between the top sheet and the back sheet 12 with an adhesive in an elongation rate of 60 to 140%. ing. The leg elastic member 19 has an elongation rate of 30% and an elongation stress of 10 to 50 gf. The leg elastic member 19 is bonded to the top sheet and the back sheet 12 with an adhesive in an elongation rate of 60 to 140%. It is fixed.
The “stretch rate” is the ratio of the length of the stretched portion to the natural length. For example, when a 10 cm length is stretched to 20 cm, the stretch rate is 100%.
[0013]
Each of these components is the same as the conventional known technology.
[0014]
Thus, in the pants-type disposable diaper 10 of the present embodiment, as shown in FIG. 1, a welded joint 15 between the side edge A ′ of the abdominal side A and the side edge of the back side. Is provided with a weakly joined portion 15a joined with a joining strength smaller than that of other portions over a predetermined length from the opening edge 17 'of the leg opening.
[0015]
More specifically, the welding joint 15 has a width of 5 to 15 mm, and the entire length from the opening edge 16 ′ of the waist opening to the opening edge 17 ′ of the leg opening. It is formed over. The welded joint 15 includes the weak joint 15a from the opening edge 17 'of the leg opening to 30 mm, and the strong joint 15b on the waist opening side of the weak joint 15a.
[0016]
The weakly joined portion 15a and the strongly joined portion 15b are formed by welding in a line shape along the width direction of the welded joint portion 15. This linear welding is performed in parallel in the length direction of the welded joint 15 at intervals of 3 to 5 mm in the weak joint 15a, and the joint strength in the weak joint 15a is 300 to 800 gf / 30 mm. ing. In addition, the same linear welding is performed in parallel in the length direction of the welded joint 15 at intervals of 0.5 to 2 mm in the strong joint 15b, and the joint strength in the strong joint 15b is 1000 to 5000 gf / It is 30 mm. As described above, in the pants-type disposable diaper 10 of the present embodiment, the welding of the same linear pattern by the same technique is performed at a weaker joint 15a with a gap than the strong joint 15b, thereby reducing the weakness. The joint strength of the joint portion 15a is set smaller than that of the strong joint portion 15b.
[0017]
As shown in FIG. 2, the bonding strength is 300 mm by holding the abdominal part A and the back part B, which are joined over 30 mm at the weakly joined part 15a or the strong joined part 15b, by the chuck. This is the tensile force obtained by performing a 180 ° peel test with a Tensilon tensile test device at / min. In the case of a sample whose width is less than 30 mm, the tensile force is converted to a width of 30 mm.
[0018]
In the pants-type disposable diaper 10 of the present embodiment having the above-described configuration, when a wearer with a large leg circumference wears and a force is applied to the peripheral edge 17 of the leg opening, the joint of the weak joint 15a is released, The leg opening is enlarged to fit around the leg of the wearer, and is brought into contact with the leg of the wearer with an appropriate force.
When a wearer with a small leg is worn, the wearer 15 is worn with the weak joint 15a joined.
[0019]
Thus, according to the pants-type disposable diaper 10 of this embodiment, the joint of the weak joint 15a is detached according to the size of the wearer's leg, and the leg opening is expanded to fit the wearer's leg. Therefore, even if a wearer with a large leg size with respect to the waist is worn, a good wearing feeling can be obtained, and the wearer's skin may be scratched or the wearer's skin may be damaged. Can be avoided.
[0020]
According to the pants-type disposable diaper 10 of this embodiment, since the joint strength of the weak joint portion 15a is 800 gf / 30 mm or less, the joint of the weak joint portion 15a is worn by a wearer whose legs are tight. In addition, it easily disengages due to the force from around the legs.
According to the pants-type disposable diaper 10 of this embodiment, since the joint strength of the weak joint portion 15a is 300 gf / 30 mm or more, when a wearer who does not have a tight leg wears it, it must be carelessly detached. I can't.
[0021]
According to the pants-type disposable diaper 10 of the present embodiment, since the weakly joined portion 15a is provided from the opening edge 17 'of the leg opening to 30 mm, it can be applied particularly to a wide range of leg circumference sizes.
According to the pants-type disposable diaper 10 of the present embodiment, since the weak joint 15a is provided only from the opening edge 17 'of the leg opening to 30 mm, the leg can be removed even after the weak joint 15a is detached. The fit of the peripheral edge portion 17 of the leg opening by the elastic member 19 is maintained substantially equal to that before the weak joint portion 15a is detached.
According to the pants-type disposable diaper 10 of the present embodiment, since the weak joint 15a is provided only from the opening edge 17 'of the leg opening to 30 mm, even after the weak joint 15a is detached, the weak joint 15a is strong. The shape of the waistline is maintained without being changed by the joining of the joining portion 15b, and a good wearing property is exhibited without causing an increase in displacement or the like during wearing.
[0022]
The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, the weak joint 15a may not be provided from the opening edge 17 'of the leg opening in the welded joint 15 to 30mm, from the opening edge 17' of the leg opening to 10mm, 20mm, or the like. It may be provided. However, the weak joint 15a is preferably provided within a range of 5 to 30 mm from the opening edge 17 ′ of the leg opening. If it is less than 5 mm from the opening edge 17 ′ of the leg opening, the range of the leg size that can be applied is narrow, and it may be difficult to adapt to the wearer's body shape. Pants-type disposable diapers are easy to slip off during wearing.
[0023]
The weak joint 15a and the strong joint 15b of the welded joint 15 may not be formed by welding in a line shape along the width direction of the welded joint 15, and may be other weld patterns such as dots. It can be welded. Moreover, it can also be set as the welding pattern from which the weak junction part 15a and the strong junction part 15b differ.
The difference in bonding strength between the weak bonding portion 15a and the strong bonding portion 15b can be generated by changing the distance between the welding patterns as in the above-described embodiment. Other techniques such as changing the shape of the welding pattern or changing the size of the welding pattern as shown can also be used.
The pants-type disposable diaper may be provided with a trunk elastic member for forming a gather continuously in the waistline direction closer to the crotch than the waist elastic member.
[0024]
【The invention's effect】
As described above, according to the pants-type disposable diaper of the present invention, it can be applied to wearers of various body types.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a pants-type disposable diaper of the present invention.
FIG. 2 is a plan view of a main part showing another example of the pants-type disposable diaper of the present invention.
FIG. 3 is an explanatory view showing a method for measuring the bonding strength of the welded joint in the pant-type disposable diaper of the present invention.
FIG. 4 is a plan view of a principal part showing a conventional pants-type disposable diaper.
[Explanation of symbols]
10 Pants-type disposable diaper 12 Back sheet 15 Welded joint 15a Weak joint 15b Strong joint 16 Peripheral part 16 ′ (of waist opening) Opening edge 17 (of waist opening) Peripheral part 17 (of leg opening) 'Opening edge 18 (of the leg opening) Waist elastic member 19 Leg elastic member 20 Pants-type disposable diaper 25a Welded part A Ventral part C Inseam

Claims (3)

A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the two sheets, and a ventral part located on the abdomen side of the wearer when worn, and a back located on the back side It is divided into a side part and a crotch part located between the ventral side part and the dorsal side part, and the side edge part of the abdominal side part and the side edge part of the dorsal side part are welded and A waist opening and a pair of leg openings are formed by joining, and an elastic member is formed on each peripheral edge of the pair of leg openings to form a gather that is continuous over substantially the entire circumference of the peripheral edge. In pants-type disposable diapers,
The welded joint between the side edge of the abdominal side and the side edge of the back side has a smaller joint strength than the other parts over a predetermined length from the opening edge of the leg opening. With a weakly joined part,
Bonding strength of the weak joint Ri 300~800gf / 30mm der,
The pants-type disposable diaper characterized in that the elastic member that forms the gathers at the peripheral edge of the leg opening is disposed so that ends thereof overlap each other at the weak joint of the weld joint. . The pants-type disposable diaper according to claim 1, wherein the weakly bonded portion is provided over a length of 5 to 30 mm from an opening edge of the leg opening in the welded bonded portion. The pants-type disposable diaper according to claim 1 or 2, wherein the welded joint includes a strong joint having a joint strength of 1000 to 5000 gf / 30 mm as the other part.

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