JP2011147495A - Pants type disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants type disposable diaper for which stimulation to the skin or the like by the welding part of a side bonding part is reduced. <P>SOLUTION: A plurality of arch-shaped welding parts 26 are arrayed along the vertical direction Y at the left and right side bonding parts 3 of the pants type disposable diaper, and edge parts on both left and right sides of the front abdominal part 11 of a diaper base material 2 and edge parts on both left and right sides of a rear back part 12 are welded at the arch-shaped welding parts 26. The respective arch-shaped welding parts 26 have an almost arch shape curved so as to be convex toward the inner side of the left and right direction X. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pants-type disposable diaper.

  As a conventional pants-type disposable diaper, there is one in which the edges of the front body and the back body are welded to each other by heat welding or the like at the left and right edges (side joints) of the front body and the back body (Patent Document 1). 2). As a material for the diaper base material that forms a pants-type diaper shape, a non-woven fabric that is soft and flexible is generally used. However, in the non-woven fabric portion that has been welded, the non-woven fabric is temporarily attached along with the welding. Since it melts and hardens, it becomes harder than before welding. For this reason, in pants-type disposable diapers, the welded part of the side joint, which has become harder due to the welding, is pressed around the waist of the wearer (especially around the hipbone), which stimulates the skin and the like, making the wearer feel uncomfortable. There are problems such as feeling. In particular, when there is a corner at the end portion on the inner side in the left-right direction of the welded portion of the side joint portion, stimulation to the skin or the like tends to be strong due to the corner.

  In order to prevent the welded portion from becoming hard, there is a method in which welding is performed by ultrasonic welding rather than heat welding. However, the equipment for ultrasonic welding has a higher equipment cost than heat welding, and diapers There is a problem that the manufacturing cost of the device increases.

Japanese Patent No. 2531924 JP 2002-102283 A

  Then, the problem which this invention should solve is providing the underpants type disposable diaper by which the irritation | stimulation to the skin etc. by the welding part of a side junction part was reduced.

  In order to solve the above problems, in the invention of claim 1, a pants-type disposable diaper, comprising a resin sheet material, and having a shape in which a front abdomen and a back part are connected via a crotch part. A diaper base material having left and right side edge portions of the front abdomen of the diaper base material and left and right side joint portions joined in a state where the left and right side edge portions of the back portion are overlapped in the front-rear direction, The left and right side joints are arranged along the vertical direction and each have a substantially arch shape curved so as to protrude toward the inner side in the left and right direction, and the front side of the diaper base material A plurality of arch-shaped welds are provided to weld the edges on the left and right sides of the abdomen and the edges on the left and right sides of the back portion.

  According to a second aspect of the present invention, in the pants-type disposable diaper according to the first aspect of the invention, the plurality of arch-shaped welded portions of the left and right side joints are vertically displaced at positions shifted in the left-right direction. The inner rows and the outer rows provided along the rows are alternately arranged one by one or plural.

  Moreover, in invention of Claim 3, in the underpants type disposable diaper which concerns on invention of Claim 1, the said right and left side junction part is along the said up-down direction in the outward side of the said left-right direction of the said arch-shaped welding part. The rims are arranged and have a substantially linear shape extending substantially parallel or oblique to the left-right direction, and the edges on the left and right sides of the front abdomen of the diaper base and the edges on the left and right sides of the back A plurality of linear welds for welding the parts are further provided.

  According to the pants-type disposable diaper according to the first aspect of the present invention, the left and right side joints are provided with a plurality of arch-shaped welds, and the arch-shaped welds are arranged along the vertical direction, Each has a substantially arcuate shape that is curved so as to be convex toward the inner side. For this reason, the irritation | stimulation to the skin etc. by the welding part of a side junction part can be reduced. Further, since the arch-shaped welded portion has the substantially arch-shaped shape as described above, even when the arch-shaped welded portion is deformed by welding, the arch-shaped welded portion is located on the inner side in the left-right direction. Corners are hard to be formed at the end.

  According to the second aspect of the present invention, the plurality of arch-shaped welded portions of the side joint portions are provided one by one or plural in the inner row and the outer row provided along the vertical direction at positions shifted in the left-right direction. They are arranged alternately one by one. Thus, by arranging the arch-shaped welded portions in the inner row and the outer row, the arch-shaped welded portions are arranged in the inner row every other or plural. Thus, without reducing the number of arch-shaped welds provided in the side joints, the vertical distance between the arch-shaped welds in the inner row that presses the skin of the wearer can be increased. The irritation | stimulation to the skin etc. by the welding part of this can be reduced more.

  According to the invention described in claim 3, the left and right side joint portions are provided with a plurality of linear weld portions each having a substantially linear shape extending substantially parallel or oblique to the left-right direction. The welding part is arranged along the up-down direction on the outer side in the left-right direction of the arch-shaped welding part. By adding the linear welds in this way, even if the arch welds are arranged at a large interval in the vertical direction, the bonding strength of the side joints can be sufficiently increased even if the number of arch welds is reduced. It can be secured. As a result, the vertical distance between the arch-shaped welds that press the wearer's skin and the like can be increased, and the stimulation of the skin and the like by the welds of the side joints can be further reduced.

It is a perspective view of the underpants type disposable diaper concerning one embodiment of the present invention. It is a figure which expands and shows the side junction part of the underpants type disposable diaper of FIG. It is a figure which shows the modification of the structure shown in FIG. It is a figure which shows the other modification of the structure shown in FIG.

  With reference to FIG.1 and FIG.2, the structure of the underpants type disposable diaper (henceforth a "diaper" only) based on one Embodiment of this invention is demonstrated. As shown in FIGS. 1 and 2, the diaper 1 includes a diaper base 2 and left and right side joints 3. Note that FIG. 2 shows an enlarged configuration of the left side joint portion 3 on the basis of the wearer, but the right side joint portion 3 also has the same configuration.

  The diaper base material 2 is configured to include a resin sheet material (for example, non-woven fabric), and has a shape in which a front abdomen 11 and a back part 12 are connected via a crotch part 13. An absorption core (not shown) that absorbs excretory fluid such as urine is disposed on the crotch portion 13 of the diaper substrate 2. In the left and right side joints 3, the left and right edges of the front abdomen 11 of the diaper substrate 2 and the right and left edges of the back 12 are joined together by welding. As a result, a pant-shaped shape of the diaper substrate 2 having the waist opening 16 and the left and right leg holes 17 is obtained. In the present embodiment, heat welding is used for welding the side joints 3, but ultrasonic welding may be used.

  Around the waist opening 16 of the diaper base material 2, a front waist elastic member 18 and a rear waist elastic member 19 for forming waist gathers are provided in a state of being stretched substantially in the left-right direction X. A leg elastic member 20 for forming leg gathers is provided around the left and right leg holes 17 of the diaper base material 2 in an extended state. Moreover, in this embodiment, the interior member 21 is provided to the skin surface side of the diaper base material 2, and the absorbent core is provided in the interior member 21.

  As shown in FIG. 2, a plurality of arch-shaped welds 26 are arranged in the left and right side joints 3 along the vertical direction Y, and the left and right edges of the front abdomen 11 of the diaper base 2 The left and right edge portions of the back portion 12 are welded by the arch-shaped weld portion 26. Each arcuate welded portion 26 has a substantially arcuate shape that is curved so as to protrude toward the inner side in the left-right direction X.

  For this reason, the irritation | stimulation to the skin by the arch-shaped welding part 26 of the side junction part 3 can be reduced. Further, since the arch-shaped welded portion 26 has a substantially arch-shaped shape as described above, even if the arch-shaped welded portion 26 is deformed by welding, the inner side of the arch-shaped welded portion 26 in the left-right direction is reduced. Corners are unlikely to be formed at the end on the side. Thereby, even if it welds the side junction part 3 using heat welding with a low equipment cost, a corner | angular part is hard to be formed in the edge part of the inner side of the left-right direction of the arch-shaped welding part 26, and the manufacturing cost of the diaper 10 Can be suppressed.

  Next, with reference to FIG.3 and FIG.4, the modification of the side junction part 3 of the above-mentioned diaper 1 is demonstrated. In the modification shown in FIG. 3, the plurality of arch-shaped welded portions 26 of the left and right side joint portions 3 are arranged in the inner row L1 and the outer row L2 provided along the vertical direction Y at positions shifted in the left-right direction X. They are arranged one by one or by turns. For this reason, the arch welds 26 distributed to the inner row L1 and the arch welds 26 distributed to the outer row L2 are alternately arranged one by one or plural in the vertical direction Y. In the configuration shown in FIG. 3, the arch-shaped welds 26 are arranged alternately in the vertical direction Y in the inner row L1 and the outer row L2.

  Thus, by arranging the arch welds 26 alternately in the inner row L1 and the outer row L2, the arch welds 26 are arranged in the inner row L1 every other one or more. Accordingly, the interval D in the vertical direction Y of the arch-shaped welded portion 26 of the inner row L1 that presses the wearer's skin or the like is increased without reducing the number of arch-shaped welded portions 26 provided in the side joint portion 3. The irritation | stimulation to the skin by the arch-shaped welding part 26 of the side junction part 3 can be reduced more.

  In the modification shown in FIG. 4, the left and right side joint portions 3 are provided with a plurality of linear weld portions 27 in addition to the arch-shaped weld portion 26 described above. The plurality of linear weld portions 27 are arranged along the vertical direction Y on the outer side of the arch-shaped weld portion 26 in the left-right direction X, and have a substantially linear shape extending substantially parallel or oblique to the left-right direction X. Each has. Therefore, in the configuration shown in FIG. 4, the left and right edges of the front abdomen 11 of the diaper base 2 and the left and right edges of the rear part 12 in the left and right side joints 3 have a plurality of arcuate welds. The portion 26 and the plurality of linear weld portions 27 are joined by welding. In the configuration shown in FIG. 4, each linear weld portion 27 extends substantially in a straight line substantially parallel to the left-right direction X.

  By adding the linear welded portion 27 to the side joint portion 3 in this way, even if the arch-shaped welded portions 26 are arranged with a large distance D in the vertical direction Y, the number of the arch-shaped welded portions 26 can be reduced. In addition, the bonding strength of the side bonding portion 3 can be sufficiently secured. As a result, the distance D in the vertical direction Y of the arch-shaped weld portion 26 that presses the wearer's skin or the like can be increased, and the stimulation to the skin or the like by the arch-shaped weld portion 26 of the side joint portion 3 can be further reduced. .

  DESCRIPTION OF SYMBOLS 1 Diaper, 2 diaper base material, 3 Side junction part, 11 Front abdominal part, 12 Rear back part, 13 Crotch part, 16 Waist opening, 17 Leg hole, 18 Front waist elastic member, 19 Rear waist elastic member, 20 Leg elastic member , 21 interior member, 26 arch-shaped welded portion, 27 linear welded portion, L1 inner row, L2 outer row, X left-right direction, Y up-down direction.

Claims (3)

A pants-type disposable diaper,
A diaper base material configured to include a resin sheet material and having a shape in which a front abdomen and a back part are connected via a crotch part,
Left and right side joints that join the left and right edges of the front abdomen of the diaper base and the left and right edges of the back part in a state where they are overlapped in the front-rear direction;
With
The left and right side joints are
Each of the edge portions on both the left and right sides of the front abdomen of the diaper base material, each of which has a substantially arcuate shape that is arranged along the vertical direction and is curved so as to protrude toward the inner side in the left-right direction. A pants-type disposable diaper comprising a plurality of arch-shaped welds for welding the left and right edges of the back portion. In the underpants type disposable diaper according to claim 1,
The plurality of arch-shaped welds of the left and right side joints are alternately distributed one by one or plurally to an inner row and an outer row provided along the vertical direction at positions shifted in the left-right direction. A pants-type disposable diaper characterized by being arranged. In the underpants type disposable diaper according to claim 1,
The left and right side joints are
The arch-shaped welded portion is arranged along the up-down direction on the outer side in the left-right direction, and has a substantially linear shape extending substantially parallel or oblique to the left-right direction. A pants-type disposable diaper, further comprising a plurality of linear welds that weld the edges on the left and right sides of the front abdomen and the edges on the left and right sides of the back part.

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