JP6389421B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  Conventionally, as a disposable diaper that receives excrement from a wearer, a tape that is worn around a waist with a fastening tape between a front part that contacts the abdomen side of the wearer and a rear part that touches the back side of the wearer The type is used. For example, in the tape-type disposable diaper disclosed in Patent Document 1, in the landing tape to which the fastening tape is fastened, by providing ribs that project along the vertical direction, good peel strength can be obtained.

  In the disposable diaper of patent document 2, the female member of a mechanical fastener is attached to the outer surface of a back seat via the sheet | seat member which can be expanded-contracted to the trunk periphery direction of a diaper. In the diaper, the female member repeatedly undulates the peaks and valleys in the left and right direction around the trunk, and the loop portion of the female member tends to stand up at the top of the mountain, making it easy to engage the male member of the fastening tape. Become.

  In the disposable diaper of Patent Document 3, in the target tape to which the fastening tape is connected, a fixed portion fixed to the center portion in the width direction of the abdominal side portion, and a free portion extending from the fixed portion to both sides in the width direction. Provided. The free part is fixed to the outer surface of the ventral part so as not to be fixed or peelable. The free portion is provided with an elastic expansion / contraction portion that elastically expands and contracts in the width direction. Thereby, in the wearing state of the disposable diaper, the abdomen part is elastically tightened in the circumference direction by elastic expansion and contraction of the target tape.

  In Patent Document 4, a fastening tape is provided by opening an opening in the backsheet material to expose the inner layer on the lower side of the backsheet, or by folding the inner layer on the side facing the user to the outer surface side of the backsheet. A method of forming a joining member that can be mechanically engaged with a joint member is disclosed.

JP-A-10-118120 Japanese Patent Laid-Open No. 10-99375 JP 2010-200288 A Japanese National Patent Publication No. 11-500028

  By the way, as in Patent Documents 1 to 3, when a member for fastening the fastening tape is provided on the outer surface of the front part, it is necessary to prepare the member separately and join it on the outer surface. The manufacturing cost of a disposable diaper will increase. In the method of Patent Document 4, a complicated process of providing an opening in the back sheet at the front portion or folding back the inner layer and the back sheet is required, so that the manufacturing cost of the disposable diaper increases.

  This invention is made | formed in view of the said subject, and aims at reducing the manufacturing cost of a tape-type disposable diaper.

The invention according to claim 1 is a disposable diaper, which is attached to a substantially sheet-like main body portion having a front portion, a crotch portion and a rear portion in order in a longitudinal direction, and both side portions of the rear portion, and the front portion. A pair of connecting portions that connect the both side portions to both side portions of the front portion, and the main body portion includes an absorbent core, and a top sheet that covers an inner surface of the absorbent core. An exterior sheet that is disposed at the outermost portion of the main body and covers the entire outer surface of the absorbent core, and at least the outer surface is formed of a nonwoven fabric, and a plurality of elastic members that are joined to the exterior sheet at the front portion. has, by the plurality of elastic members contracts, said a fold forming portion for forming a number of folds in a region overlapping with at least the front end portion of the absorbent core in the outer sheet, the plurality of elastic members A plurality of line-like shapes each extending in the left-right direction and arranged in the longitudinal direction, and each extending in the longitudinal direction and arranged in the left-right direction on the inner surface of the exterior sheet in the front portion regions and adhesive adheres to said plurality of elastic members, that are joined to the outer sheet by adhesive in the plurality of line-shaped region.

Invention of Claim 2 is the disposable diaper of Claim 1 , Comprising: On the inner surface of the said exterior sheet | seat in the said back part, The other other line shape which is the arrangement | sequence similar to these line-shaped area | regions An adhesive is attached to the region, and the elastic member extending in the left-right direction at the rear end of the exterior sheet is joined to the exterior sheet by the adhesive in the plurality of other line-shaped regions.

According to a third aspect of the invention, a disposable diaper according to claim 1 or 2, each of the pair of connecting portions comprises two fastening tape extending in the lateral direction are arranged in the longitudinal direction .

The invention of claim 4 is a disposable diaper according to any one of claims 1 to 3, by the plurality of elastic members of the plication portion is contracted, the front end portion of said absorbent core A wrinkle is formed.

Invention of Claim 5 is a disposable diaper in any one of Claim 1 thru | or 4 , Comprising: The site | part which overlaps with the said front-end part of the said absorption core in the said main-body part is the said top sheet, the said absorption Only the core, the back sheet that covers the outer surface of the absorbent core, and the exterior sheet that covers the outer surface of the back sheet are included as sheet components.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing cost of a tape type disposable diaper can be reduced.

It is a top view of a disposable diaper. It is sectional drawing of a disposable diaper. It is a perspective view of a disposable diaper. It is a figure which shows the outer surface of a front part. It is sectional drawing of a front part. It is a figure which shows the disposable diaper in the middle of manufacture.

  FIG. 1 is a plan view showing a disposable diaper 1 according to one embodiment of the present invention in an unfolded state. The disposable diaper 1 is a tape-type disposable diaper in which a part that is in contact with the wearer's stomach side and a part that is in contact with the back side are fastened around the waist by connecting parts 4 that are fastening sheets on both the left and right sides. Receive excrement from the wearer. In FIG. 1, the disposable diaper 1 is drawn with the surface on the side in contact with the wearer at the time of wearing (that is, the wearer side) facing forward.

  FIG. 2 is a cross-sectional view of the disposable diaper 1 cut along a plane perpendicular to the longitudinal direction (that is, the vertical direction in FIG. 1) at the position AA shown in FIG. As shown in FIGS. 1 and 2, the disposable diaper 1 is disposed on a substantially sheet-like main body 2 and on both sides of the main body 2 (that is, both ends in the left-right direction perpendicular to the longitudinal direction). A pair of side seats 3 is provided over the entire length of the main body 2 in the longitudinal direction.

  The upper part 201 and the lower part 203 in FIG. 1 of the main body 2 are parts that contact the skin of the wearer's abdomen and dorsal side, respectively. In the following description, “front part 201” and “rear part” Part 203 ". Further, a portion 202 that is continuous from the front portion 201 and the rear portion 203 between the front portion 201 and the rear portion 203 and faces the crotch portion of the wearer is referred to as a “crotch portion 202”. In the disposable diaper 1, the main body 2 has a front part 201, a crotch part 202, and a rear part 203 in order in the longitudinal direction, and the width of the front part 201 and the rear part 203 is larger than the width of the crotch part 202.

  The disposable diaper 1 further includes a pair of connection parts 4 attached to both sides of the rear part 203. Each connecting portion 4 is arranged in the longitudinal direction of the main body portion 2 and extends in the left-right direction, and is positioned on the inner side in the left-right direction of the two fastening tapes 41 (that is, on the main body portion 2 side). A substantially rectangular common base 42 is provided. The structure and shape of the two fastening tapes 41 are the same. Each fastening tape 41 includes a tape-like tape base portion 413 extending in the left-right direction, and a first fastening portion 411 and a second fastening portion 412 provided on one main surface 414 of the tape base portion 413. In FIG. 1, in order to facilitate understanding of the drawing, the first fastening portion 411 and the second fastening portion 412 are indicated by parallel diagonal lines. The main surface 414 of the tape base 413 is a surface that faces the front portion 201 (see FIG. 3) of the main body 2 when the disposable diaper 1 is attached to the wearer. On the main surface 414 of the tape base 413, the second fastening part 412 is disposed away from the first fastening part 411 via the intermediate region 415 toward the main body part 2 side.

  Each of the first fastening portion 411 and the second fastening portion 412 is a hook member of a hook-and-loop fastener, and is on the outer surface of the front portion 201 of the main body portion 2 (that is, the surface opposite to the surface in contact with the wearer). It can be attached to a later-described attached region 26 (see FIG. 3). The fastening portions 411 and 412 are joined to the main surface 414 of the tape base 413 by a hot melt adhesive or the like. The fastening portions 411 and 412 have a fine hook structure provided on a base sheet formed of resin or the like and a surface opposite to the surface to be joined to the tape base 413 of the base sheet. A fine hook structure is a collection of many fine hook elements. In the fine hook structure, various shapes of hook elements may be used as long as the engagement with the attachment region 26 is possible.

  When the disposable diaper 1 is attached to the wearer, each connection as shown in FIG. 3 with the front part 201 and the rear part 203 of the main body 2 in contact with the abdomen and the back of the wearer, respectively. The first fastening part 411 and the second fastening part 412 of the part 4 are fastened to the fastened area 26 on the outer surface of the front part 201. Thereby, both side portions of the rear portion 203 are connected to both side portions of the front portion 201.

  As shown in FIG. 2, the main body 2 includes a liquid-permeable top sheet 21, a water-repellent or liquid-impervious back sheet 23, and an absorbent core disposed between the top sheet 21 and the back sheet 23. 22. The top sheet 21 covers the inner surface (surface on the wearer side) of the absorbent core 22, and the back sheet 23 covers the outer surface of the absorbent core 22. In FIG. 2, for convenience of illustration, each component of the disposable diaper 1 is drawn away in the thickness direction. Moreover, in FIG. 1, the outline of the absorption core 22 is drawn with the thick broken line, in order to make an understanding of a figure easy. As shown in FIG. 1, the width of the absorbent core 22 in the front part 201 and the rear part 203 is larger than the width of the absorbent core 22 in the crotch part 202. In other words, the absorption core 22 has an hourglass shape.

  The main body 2 further includes an exterior sheet 24 that covers the outer surface of the back sheet 23, and a heel forming part 25 that is provided in the front part 201. The exterior sheet 24 is disposed on the outermost side of the main body 2 and is joined to the outer surface of the back sheet 23. The exterior sheet 24 directly or indirectly covers the entire outer surface of the top sheet 21, the back sheet 23, and the absorbent core 22. The wrinkle forming unit 25 forms a large number of wrinkles in the above-described adherend region 26 of the exterior sheet 24. Details of the heel forming portion 25 will be described later.

  As shown in FIG. 2, the top sheet 21 is joined to the back sheet 23 via a hot melt adhesive around the absorbent core 22. Further, the laterally outer portion of the side sheet 3 is hot melted over the entire length in the longitudinal direction at a portion exposed from the topsheet 21 of the backsheet 23 and a portion in the vicinity of the lateral edge of the topsheet 21. Joined via an adhesive. The side sheet 3 includes a side sheet main body 31 and an elastic member 32a that is joined to a free end that is an inner edge portion in the left-right direction of the side sheet main body 31 by a hot melt adhesive and extends in the longitudinal direction.

  At both ends in the longitudinal direction of the main body 2 shown in FIG. 1, the inner portions in the left-right direction of each side seat 3 (that is, the central portion in the left-right direction of the main body 2) are on the wearer side of the top sheet 21. It is joined to the surface via a hot melt adhesive. As shown in FIG. 1 and FIG. 2, in the crotch part 202 of the main body 2, two elastic members 32 b extending in the longitudinal direction in the vicinity of the lateral edge of the side seat 3 are connected to the side seat 3. It is sandwiched between the back sheet 23 and joined by a hot melt adhesive. As these hot melt adhesives, polyolefin-based, rubber-based, vinyl acetate-based and the like are used. Note that the bonding between the top sheet 21 and the back sheet 23 and the bonding between the side sheet 3 and the top sheet 21 and the back sheet 23 may be performed by thermal fusion bonding, ultrasonic bonding, or the like.

  In each side seat 3, the inner portion 313 between both end portions in the longitudinal direction of the side seat body 31 (that is, the central portion in the longitudinal direction) is not joined to the top sheet 21 (and other configurations). . As the elastic member 32a contracts, as shown in FIG. 2, the portion 313 rises toward the wearer and becomes a side wall (so-called three-dimensional gather) in contact with the vicinity of the base of the wearer's leg. Further, the elastic member 32b contracts, so that the side sheet 3, the back sheet 23, and the exterior sheet 24 rise toward the wearer side and inward to form a leg gather, and when the disposable diaper 1 is worn, Adhere close to the base.

  The top sheet 21 is a liquid-permeable sheet material that quickly captures the moisture of excrement from the wearer and moves it to the absorbent core 22. The top sheet 21 is, for example, a liquid-permeable nonwoven fabric formed of hydrophobic fibers (polypropylene, polyethylene, polyester, polyamide, nylon, etc.) whose surfaces are hydrophilically treated with a surfactant. Point bond nonwoven fabric, air-through nonwoven fabric, and spunbond nonwoven fabric are used. In addition, as the top sheet 21, a nonwoven fabric (for example, a spunlace nonwoven fabric) formed of hydrophilic fibers such as cellulose, rayon, or cotton may be used.

  The absorbent core 22 is made by mixing a hydrophilic fiber such as pulverized pulp fiber or cellulose fiber with a superabsorbent polymer (SAP (Super Absorbent Polymer)) or a superabsorbent material such as a superabsorbent fiber. It is formed by wrapping with a liquid-permeable nonwoven fabric or the like, and absorbs moisture that has passed through the top sheet 21 and quickly fixes it. Tissue paper, liquid-permeable nonwoven fabric, etc. that wraps hydrophilic fibers are joined to the hydrophilic fibers and water-absorbing material with a hot-melt adhesive, and the shape of the hydrophilic fibers is lost. Prevent later dropout). In the present embodiment, the absorbent core 22 includes pulp fibers and SAP.

  As the back sheet 23, a water-repellent or liquid-impervious nonwoven fabric (for example, a spunbond nonwoven fabric, a meltblown nonwoven fabric, an SMS (spunbond / meltblown / spunbond) nonwoven fabric) formed of hydrophobic fibers, A liquid-impermeable plastic film or a laminated sheet in which these nonwoven fabrics and plastic films are laminated is used. When a plastic film is used for the back sheet 23, a plastic film having moisture permeability (breathability) may be used from the viewpoint of preventing the disposable diaper 1 from being steamed and improving the wearer's comfort. preferable.

  As the exterior sheet 24, similarly to the back sheet 23, a water-repellent or liquid-impervious nonwoven fabric formed of hydrophobic fibers, or a laminated sheet in which these nonwoven fabrics and a plastic film are laminated is used. . Thereby, the water | moisture content of the excrement which reached | attained the exterior sheet | seat 24 is prevented from seeping out to the outer side of the main-body part 2. FIG. When a laminated sheet is used in the exterior sheet 24, the nonwoven fabric is disposed on the side opposite to the back sheet 23. That is, in the exterior sheet 24, at least the outer surface is formed of a nonwoven fabric. When the back sheet 23 prevents moisture from seeping outside the main body 2, a non-woven fabric or the like formed of hydrophilic fibers may be used as the exterior sheet 24, similar to the top sheet 21. .

  As the side sheet main body 31, for example, a water-repellent or liquid-impervious nonwoven fabric (spunbond nonwoven fabric, melt blown nonwoven fabric, SMS nonwoven fabric, or the like) formed of hydrophobic fibers is used. As the elastic members 32a and 32b, for example, a thread-like polyurethane (polyurethane thread), a strip-like polyurethane film, a thread-like or strip-like natural rubber, and the like are used. In this embodiment, a thread-like or strip-like polyurethane is used as each elastic member. Used (the same applies to elastic members 251 and 252 described later).

  Next, details of the wrinkle forming portion 25 will be described. FIG. 4 is a diagram illustrating an outer surface of the front portion 201 in a state where the disposable diaper 1 is unfolded. FIG. 5 is a cross-sectional view of the main body 2 cut along a plane perpendicular to the longitudinal direction at a position BB shown in FIG. In FIG. 5, the cross section of the main-body part 2 in the state which the several elastic member 251 mentioned later contracted is shown.

  As shown in FIG. 4, the heel forming portion 25 includes a plurality of elastic members 251 provided in the front portion 201. Each of the plurality of elastic members 251 extends in the left-right direction and is sandwiched between the back sheet 23 and the exterior sheet 24. The plurality of elastic members 251 have substantially the same length and are constant in the longitudinal direction from the end on the front portion 201 side in the main body portion 2 to the vicinity of the crotch portion 202 (that is, substantially over the entire front portion 201). Are arranged at a pitch of. The region where the plurality of elastic members 251 are arranged overlaps the front end 221 that is the end of the absorbent core 22 on the front portion 201 side.

  A plurality of line-shaped regions 241 each extending in the longitudinal direction are set on the inner surface of the exterior sheet 24 in the front portion 201 (that is, the surface on the back sheet 23 side). In FIG. 4, parallel diagonal lines are given to the plurality of line-shaped regions 241. The plurality of line-shaped regions 241 have substantially the same length, and are arranged with a gap having a constant width in the left-right direction (and at a constant pitch). Each line-shaped region 241 is an adhesive application region. Note that, depending on the design of the disposable diaper 1, the intervals between the plurality of elastic members 251 and the intervals between the plurality of line-shaped regions 241 may not be constant.

  In the front part 201, the back sheet 23 and the exterior sheet 24 are made to adhere to each other by an adhesive 250 (for example, a hot-melt adhesive, which is shown in black in FIG. 5) attached to the plurality of line-shaped regions 241. A plurality of elastic members 251 that are stretched are joined to both the outer surface of the back sheet 23 and the inner surface of the exterior sheet 24. In other words, in each combination of two linear regions 241 adjacent to each other in the left-right direction, the back sheet 23 and the exterior sheet 24 are not joined to each other between the two linear regions 241, and a plurality of A line-shaped non-joining region 242 where the elastic member 251 is not joined to either the back sheet 23 or the exterior sheet 24 is set. The non-bonding region 242 is a non-application region of adhesive. In the inner surface of the exterior sheet 24, for example, in an area other than the area where the plurality of line-shaped areas 241 and the plurality of non-joined areas 242 are arranged, for example, an adhesive is densely applied, and the exterior sheet 24 and the back sheet 23 Are joined.

  As shown in FIG. 5, when the plurality of elastic members 251 are contracted, in each non-bonded region 242, the portion of the exterior sheet 24 bulges outwardly (to the side opposite to the elastic member 251) in a convex shape. That is, a plurality of ridges 243 are formed in the exterior sheet 24 by the contraction of the plurality of elastic members 251. The large number of ridges 243 exist with a gap having a constant width in the left-right direction, and the height thereof is substantially constant. The above-described adherence region 26 is a region where the line-like regions 241 and the non-bonding regions 242 are alternately arranged, and a large number of ridges 243 are distributed in the adherence region 26.

  As described above, the outer surface of the exterior sheet 24 is a non-woven fabric surface, and the fibers of the non-woven fabric have a substantially fine loop structure at the top of each ridge 243. As described above, the first and second fastening portions 411 and 412 of the fastening tape 41 have a fine hook structure, and the fine hook structure can be easily engaged with a large number of hooks 243. That is, the fastening portions 411 and 412 can be fastened to the fastened region 26.

  In addition, when the wearer wears the disposable diaper 1, when a force acts on the fastening tape 41 fastened to the fastened region 26 in the waist direction (direction in which the elastic member 251 extends), When 243 falls, the area where the fine hook structures of the first and second fastening portions 411 and 412 engage with the surface of the flange 243 increases. As a result, the fastening strength of the fastening tape 41 (force leading to peeling between the fastening portions 411 and 412 and the fastening region 26) is increased with respect to the force in the circumferential direction. The width of the line-shaped region 241 and the width of the non-bonded region 242 in the adherence region 26 are constant, for example, both are 2.5 millimeters (mm). From the viewpoint of preventing the fastening tape 41 from being easily detached from the to-be-attached region 26 due to the force acting in the waistline direction, the width of the non-joining region 242 is preferably 1 mm or more and 5 mm or less.

  Further, in a state in which the plurality of elastic members 251 are contracted, in each non-bonded region 242, the back sheet 23 bulges in a convex shape toward the inner side (opposite to the elastic member 251). That is, a large number of wrinkles are also formed on the backsheet 23. In addition, since the back sheet 23 is joined to the entire outer surface of the thin absorbent core 22, a large number of wrinkles are formed at the front end 221 of the absorbent core 22. Thereby, in the front part 201, it becomes possible to improve the air permeability inside the disposable diaper 1. In addition, since the absorption core 22 has a certain degree of rigidity, the interval between the ridges formed in the absorption core 22 does not necessarily coincide with the interval between the non-joining regions 242, but in FIG. The interval between the ridges formed in the region 22 is made to coincide with the interval between the non-bonding regions 242.

  As shown in FIG. 1, with respect to the longitudinal direction, a plurality of elastic members 252 extending in the left-right direction are also provided at the end of the main body 2 on the rear portion 203 side. The plurality of elastic members 252 are sandwiched between the back sheet 23 and the exterior sheet 24 and are arranged at a constant pitch in the longitudinal direction. The region where the plurality of elastic members 251 are arranged does not overlap with the rear end that is the end of the absorbent core 22 on the rear portion 203 side (of course, it may overlap). A plurality of line-shaped regions having the same arrangement as the plurality of line-shaped regions 241 (see FIG. 4) in the front portion 201 are set on the inner surface of the exterior sheet 24 in the rear portion 203. The plurality of line-shaped regions are arranged with a certain width between them in the left-right direction. The back sheet 23 and the exterior sheet 24 are joined to each other at the end of the exterior sheet 24 on the rear portion 203 side (that is, the rear end) by the adhesive adhering to the plurality of line-shaped regions and stretched. The plurality of elastic members 252 in a state are joined to both the outer surface of the back sheet 23 and the inner surface of the exterior sheet 24. Therefore, when the plurality of elastic members 252 contract, a large number of wrinkles are formed in the exterior sheet 24 and the back sheet 23.

  In the disposable diaper 1, the elastic member 251 disposed at the end portion on the front portion 201 side in the main body portion 2 and the elastic member 252 disposed at the end portion on the rear portion 203 side contract, whereby these end portions A waist gather is formed, and the main-body part 2 closely_contact | adheres to a wearer's waist circumference at the time of wear of the disposable diaper 1. FIG. Leakage of urine etc. from around the legs and around the waist is prevented by the aforementioned leg gathers and waist gathers.

  Next, manufacture of the disposable diaper 1 is demonstrated paying attention to the joining process of the elastic members 251 and 252. Drawing 6 is a figure showing disposable diaper 1 in the middle of manufacture. When the disposable diaper 1 is manufactured, the long first sheet member 91 that is to become the plurality of exterior sheets 24 in the plurality of disposable diapers 1 passes below the application portion. The application unit has a plurality of nozzles arranged at a constant pitch in the width direction of the first sheet member 91, and the adhesive is applied to the plurality of line-shaped regions 82 on the first sheet member 91. At this time, since the adhesive is intermittently discharged from the plurality of nozzles to the first sheet member 91 that moves continuously, as shown in FIG. A plurality of line-shaped regions 82 are repeatedly formed at regular intervals in the longitudinal direction of the member 91 (hereinafter referred to as “sheet longitudinal direction”). Actually, an adhesive is appropriately applied to a region other than a region where the plurality of line-shaped regions 82 are arranged.

  The first sheet member 91 to which the adhesive is applied has a plurality of elastic members 81 that extend in the width direction and are arranged at a constant pitch in the longitudinal direction of the sheet. Placed on top. A long second sheet member 92 (indicated by a two-dot chain line in FIG. 6) that is to become the plurality of back sheets 23 is disposed on the first sheet member 91 with the plurality of elastic members 81 interposed therebetween. Is superimposed on. As a result, the first sheet member 91 and the second sheet member 92 are joined to each other, and the plurality of stretched elastic members 81 are joined to both the first sheet member 91 and the second sheet member 92.

  On the second sheet member 92, the absorbent core 22 is repeatedly formed at regular intervals in the sheet longitudinal direction, and the second sheet member is formed so that the sheet member that is to be the plurality of top sheets 21 covers the entire absorbent core 22. 92 is joined. Subsequently, on the laminate of these sheet members, a pair of connection portions 4 are repeatedly arranged at a constant interval in the sheet longitudinal direction, and on both sides of the laminate (near both edges along the sheet longitudinal direction), A pair of sheet members scheduled to be a plurality of side sheets 3 are joined. At this time, a part of the connection portion 4 is joined between the sheet member that becomes the side sheet 3 and the first sheet member 91. Then, the disposable diaper 1 is completed by cut | disconnecting the laminated body of a sheet | seat member along the cutting lines C1 and C2 shown with a dashed-two dotted line in FIG.

  At this time, the cutting line C <b> 1 between two continuous disposable diapers 1 is set at a position at which the plurality of line-shaped regions 82 are cut. Therefore, the plurality of line-shaped regions in the front part 201 of one disposable diaper 1 and the other line-shaped regions in the rear part 203 of the other disposable diaper 1 are the same arrangement. Become. Further, the elastic members 81 on the plurality of linear regions in the front part 201 become the elastic members 251 and the elastic members 81 on the plurality of linear regions in the rear part 203 become the elastic members 252 (see FIG. 1). As described above, in the manufacture of the disposable diaper 1, the elastic members 251 and 252 forming the waist gathers and the numerous ridges 243 can be efficiently bonded to the exterior sheet 24 by the adhesive on the group of line-shaped regions 82. It is. With the above process, the production of the disposable diaper 1 is completed.

  Here, the loop member of a hook-and-loop fastener is prepared separately, and the disposable diaper of the comparative example joined on the outer surface of a main-body part is assumed. The loop member of the surface fastener has a fine loop structure on a base sheet formed of resin or the like. Since such a loop member is expensive, in the disposable diaper of the comparative example using a loop member, a certain limit arises in the reduction of the manufacturing cost. Moreover, since the breathability of a base sheet is low, the inside of the disposable diaper of a comparative example becomes easy to get steamed in a front part.

  On the other hand, in the disposable diaper 1 of FIG. 1, the plurality of elastic members 251 are joined to the exterior sheet 24 arranged at the outermost part of the main body 2, and the plurality of elastic members 251 contracts, thereby fastening tape. A large number of non-woven fabric ridges 243 to which 41 can be fastened are formed in the fastened area 26 on the outer surface of the front portion 201. Thereby, in the disposable diaper 1, it becomes possible to fasten the fastening tape 41 to the outer surface of the front part 201, without providing the loop member of a hook-and-loop fastener separately. Thus, the manufacturing cost of the tape-type disposable diaper 1 can be reduced by omitting the expensive loop member and omitting the joining process of the loop member. Since the elastic member 251 of the heel forming portion 25 is joined to the main body portion 2 simultaneously with the elastic members 251 and 252 forming the waist gathers, the addition of the heel forming portion 25 (addition of the elastic member 251 for forming the heel 243) ) Costs are negligible.

  In the disposable diaper 1, due to the contraction of the plurality of elastic members 251, a gathering gather for fitting the front part 201 of the main body part 2 to the wearer is formed. Thereby, the wearing feeling of the disposable diaper 1 in a wearer can be improved. Since the elastic member 251 provided in the heel forming portion 25 is thread-like or belt-like, the air permeability of the front portion 201 is improved as compared with the case where a sheet-like elastic member having a large width in the longitudinal direction of the main body portion 2 is used. It is possible to suppress the stuffiness inside the disposable diaper 1.

  In addition, on the inner surface of the exterior sheet 24 in the front portion 201, each extends in the longitudinal direction, and an adhesive is attached to the plurality of line-shaped regions 241 arranged in the left-right direction, and the plurality of elastic members 251 include a plurality of elastic members 251. The line-shaped region 241 is bonded to the exterior sheet 24 with an adhesive. Thereby, many ridges 243 extending in the longitudinal direction can be formed with high accuracy, and a preferable appearance of the disposable diaper 1 can be obtained.

  The disposable diaper 1 can be variously modified.

  If a large number of ridges 243 are formed in the outer sheet 24 at least in a region overlapping with the front end 221 of the absorbent core 22, the number of thread-like or belt-like elastic members 251 in the heel forming portion 25 is arbitrarily determined. Good. In addition, a large number of wrinkles may be formed in the adherend region 26 by joining one sheet-like elastic member having a large width in the longitudinal direction of the main body 2 to the exterior sheet 24. In this case, the elastic member is preferably joined to the exterior sheet 24 in a stretched state in the left-right direction.

  Depending on the design of the disposable diaper 1, the elastic member may be bonded to the exterior sheet 24 with an adhesive applied in a pattern other than the arrangement of the plurality of line-shaped regions 241, and a large number of wrinkles may be formed in the exterior sheet 24. . Moreover, the range of the to-be-attached area | region 26 in the disposable diaper 1 may be suitably changed as long as it overlaps with the front end part 221 of the absorption core 22 partially or entirely.

  In the disposable diaper 1, the portion of the main body 2 that overlaps the front end 221 of the absorbent core 22 includes only the top sheet 21, the absorbent core 22, the backsheet 23, and the exterior sheet 24 as a sheet component (that is, a sheet shape). Of course, other sheet components may be included. Further, the exterior sheet 24 may also serve as the back sheet 23. In this case, only the top sheet 21, the absorbent core 22, and the exterior sheet 24 that directly covers the entire outer surface of the absorbent core 22 are included in the main body 2. It is provided as a seat component.

  In the disposable diaper 1 in which the loop member of the hook-and-loop fastener is omitted, it is possible to easily form the large attachment region 26 by forming a large number of ridges 243 in the exterior sheet 24. Therefore, the above-described method of forming a large number of ridges 243 is particularly suitable for the disposable diaper 1 in which each connection portion 4 includes two fastening tapes 41 and thus requires a relatively large securing region 26. I can say that. Of course, only one fastening tape 41 may be provided for each connecting portion 4.

  The configurations in the above-described embodiments and modifications may be combined as appropriate as long as they do not contradict each other.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Main body part 4 Connection part 21 Top sheet 22 Absorption core 23 Back sheet 24 Exterior sheet 25 Wrinkle formation part 26 Sticking area | region 41 Fastening tape 201 Front part 202 Crotch part 203 Back part 221 Front end part 241 Line shape Region 243 ２５０ 250 Adhesive 251,252 Elastic member

Claims (5)

Disposable diapers,
A substantially sheet-like main body portion having a front portion, a crotch portion and a rear portion in order in the longitudinal direction;
A pair of connecting portions that are attached to both side portions of the rear portion and fastened to the outer surface of the front portion, thereby connecting the both side portions to both side portions of the front portion;
With
The main body is
An absorbent core;
A top sheet covering the inner surface of the absorbent core;
An outer sheet that is arranged at the outermost part in the main body and covers the entire outer surface of the absorbent core, and at least the outer surface is formed of a nonwoven fabric;
The front portion includes a plurality of elastic members joined to the exterior sheet, and the plurality of elastic members contracts, whereby a plurality of wrinkles are formed in a region overlapping at least the front end portion of the absorbent core in the exterior sheet. A wrinkle forming part to be formed;
Equipped with a,
The plurality of elastic members each have a thread shape or a belt shape extending in the left-right direction and arranged in the longitudinal direction,
In the inner surface of the exterior sheet in the front portion, each extends in the longitudinal direction, and an adhesive is attached to a plurality of linear regions arranged in the left-right direction,
Wherein the plurality of elastic members, disposable diaper, characterized that you have been joined to the outer sheet by adhesive in the plurality of line-shaped region. The disposable diaper according to claim 1 ,
In the inner surface of the exterior sheet in the rear portion, an adhesive is attached to a plurality of other line-shaped regions that are arranged in the same manner as the plurality of line-shaped regions,
A disposable diaper, wherein an elastic member extending in the left-right direction at a rear end portion of the exterior sheet is joined to the exterior sheet by an adhesive in the plurality of other line-shaped regions. The disposable diaper according to claim 1 or 2 ,
Each of the pair of connecting portions includes two fastening tapes arranged in the longitudinal direction and extending in the left-right direction. The disposable diaper according to any one of claims 1 to 3 ,
A disposable diaper characterized in that a heel is formed at the front end of the absorbent core by contraction of the plurality of elastic members of the heel-forming portion. The disposable diaper according to any one of claims 1 to 4 ,
In the main body, the portion overlapping the front end of the absorbent core is only the top sheet, the absorbent core, the back sheet covering the outer surface of the absorbent core, and the exterior sheet covering the outer surface of the back sheet. A disposable diaper characterized in that it contains as a seat component.

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