JP6892768B2 - Disposable diapers - Google Patents

Description

The present invention relates to disposable diapers.

Conventionally, various types of disposable diapers have been known, and these disposable diapers are usually located between the front abdomen, which is applied to the ventral side of the wearer, and the back back, which is applied to the dorsal side of the wearer, and the wearer. It has a crotch part that hits the crotch part of the diaper, and an absorber is provided in the crotch part. As a disposable diaper, for example, a pair of fastening members are provided on the left and right sides of the back back, and the fastening members are used to join a tape-type disposable diaper that is formed in a pants shape when worn, or a front abdomen and a back back. Pants-type disposable diapers in which a waist opening and a pair of leg openings are formed are widely known. In addition to these, Patent Documents 1 to 3 disclose disposable diapers in which the front abdomen and the back of the diaper body are connected by a belt member. The disposable diapers disclosed in Patent Documents 1 to 3 are formed so that the front side edge and the rear side edge of the diaper body include an inclined side portion extending outward in the width direction of the diaper and inward in the front-rear direction. Belt members are attached to the inclined side portions of the front side edge and the rear side edge. By forming the disposable diaper in this way, the belt member can be positioned on the outer surface side of the diaper body, and the belt member can be positioned around the wearer's waist when wearing the diaper. It has become.

Japanese Unexamined Patent Publication No. 9-10261 Japanese Unexamined Patent Publication No. 9-2900003 Japanese Unexamined Patent Publication No. 2004-236850

Disposable diapers are required to prevent leakage of excrement from the wearer as a basic characteristic of disposable diapers. Therefore, disposable diapers are required to have an appropriate fit around the wearer's crotch and waist when worn. However, the disposable diapers disclosed in Patent Documents 1 to 3 have room for improvement in that respect.

The present invention has been made in view of the above circumstances, and an object thereof is a disposable diaper formed by connecting the front abdomen and the back back of a diaper body with a belt member, and has excellent fit to a wearer. The purpose is to provide disposable diapers that are excellent in preventing the leakage of excrement.

The disposable diaper of the present invention that has been able to solve the above problems is a diaper body having an anterior abdomen, a posterior back, and a crotch located between them in the anterior-posterior direction, and an absorber provided in the crotch. , A disposable diaper having a belt member attached to one side and the other side in the width direction on the outer surface side of the diaper body, and the belt member is fixed to the anterior fixing area fixed to the anterior abdomen and the posterior back. It has a posterior fixed area and a belt intermediate area that is located between them and is not fixed to the diaper body. The anterior fixed area and the belt intermediate area are separated by the anterior boundary line, and the posterior fixed area and the belt intermediate are separated. The region is separated by a posterior border, the anterior border is formed including an anterior ramp extending inward in the width direction and outward in the anterior-posterior direction, and the posterior border is inward in the width direction. It is formed including a posterior inclined line extending outward in the front-rear direction, and the angle formed by the front inclined line with respect to the front-rear direction is defined as an angle α, and the angle formed by the rear inclined line with respect to the front-rear direction is defined as an angle α. When the angle β is defined, both the angle α and the angle β are more than 45 ° and 75 ° or less, and the angle β is larger than the angle α.

In the disposable diaper of the present invention, the belt intermediate region, which is a non-fixed region of the belt member connecting the front abdomen and the back of the diaper body to the diaper body, is a diaper at the back of the diaper rather than the front abdomen when the diaper is worn. Since the diaper body is formed so as to extend diagonally upward from the main body, the back part of the diaper body is pulled up along the diaper, and the diaper body is in close contact with the wearer's diaper, resulting in excellent fit. Therefore, leakage of excrement from the back side of the diaper is less likely to occur.

The rear end of the rear boundary line is preferably located inward in the front-rear direction with respect to the rear edge of the diaper body. If the belt member is attached to the diaper body in this way, the back part of the diaper body can widely cover the wearer's buttocks, and when the diaper is worn, the rear end of the diaper body is a belt. It is supported by the member, and the rear end of the diaper body is less likely to bend back to the outer surface side of the diaper.

The length in the front-rear direction from the front end of the front boundary line to the rear end of the rear boundary line is preferably 50% or more and 95% or less of the length in the front-rear direction of the diaper body. By constructing the disposable diaper in this way, the diaper body is formed to have a length shorter than the length in the front-back direction of the diaper body while covering a wide range from the ventral side to the dorsal side including the wearer's crotch. The intermediate area of the belt can improve the fit of the wearer's waist. Therefore, when wearing a diaper, the disposable diaper is preferably held around the wearer's crotch and waist, and excrement such as urine is less likely to leak.

The rear side edge of the diaper body preferably includes a straight portion extending in the width direction, and the straight portion preferably has 50% or more of the length in the width direction of the diaper body. When the diaper body is formed in this way, the diaper body can widely cover the back side of the wearer at the posterior end portion. Further, since the intermediate region of the belt is formed so as to extend diagonally upward from the back back of the diaper body, when the diaper is worn, both sides of the rear end of the diaper body in the width direction are covered with the belt member. It becomes easier to improve the adhesion of the rear end of the diaper body to the wearer's skin.

It is preferable that the distance from the rear edge of the diaper body at the rear end of the rear boundary line is longer than the distance from the front edge of the diaper body at the front end of the front boundary line. When the belt member is attached to the diaper body in this way, when the diaper is worn, the dorsal side of the diaper is more likely to be covered by the diaper body than the ventral side of the wearer. Therefore, when the wearer takes a bending posture toward the front side, the diaper body is less likely to be disturbed on the ventral side of the wearer, and when the wearer is sleeping in the supine position, excretion from the back side of the diaper is performed. Leakage of things is less likely to occur.

It is preferable that the front fixing region and / or the rear fixing region of the belt member is formed so that the length in the front-rear direction is longer on the outer side than on the inner side in the width direction. The outer side of the belt member in the width direction is easily affected by the movement of the wearer's legs when wearing the diaper. Therefore, the anterior-posterior length of the anterior fixed region and / or the posterior fixed region is formed longer on the lateral side in the width direction, and the anterior fixed region and / or the posterior fixed region is formed on the lateral side in the width direction. By forming the area so as to have a larger area, the belt member is less likely to come off from the diaper body when the diaper is worn.

It is preferred that the absorber extends from the crotch to the anterior abdomen and / or the posterior back, with the anterior and / or posterior borders overlapping the absorber. If the disposable diaper is formed in this way, the rigidity at the front boundary line and the rear boundary line of the diaper body is increased, and when the diaper is worn, the diaper body is moved by the belt member at the front side boundary line and the rear side boundary line. Even if it is pulled, the diaper body will not easily bend at the front and rear boundaries.

The belt member is preferably elastic. By forming the belt member in this way, it becomes easy to improve the fit around the waist of the disposable diaper.

In the disposable diaper of the present invention, the belt intermediate region, which is a non-fixed region of the belt member connecting the front abdomen and the back of the diaper body to the diaper body, is a diaper at the back of the diaper rather than the front abdomen when the diaper is worn. Since the diaper body is formed so as to extend diagonally upward from the main body, the back part of the diaper body is pulled up along the diaper, and the diaper body is in close contact with the wearer's diaper, resulting in excellent fit. Therefore, leakage of excrement from the back side of the diaper is less likely to occur.

A front perspective view of a disposable diaper of the present invention in a used state is shown. A plan view of the disposable diaper as viewed from the back seat side in a state where the belt member of the disposable diaper shown in FIG. 1 is cut and unfolded in a plane is shown. A plan view of a disposable diaper viewed from the back seat side with the belt member of the disposable diaper shown in FIG. 1 moved to the outer surface side of the diaper body is shown. A plan view of the disposable diaper shown in FIG. 3 as viewed from the top sheet side is shown. The VV cross-sectional view of the disposable diaper shown in FIGS. 3 and 4 is shown.

The configuration of the disposable diaper according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments shown in the drawings. FIG. 1 shows a front perspective view of a disposable diaper in a used state, and FIG. 2 shows a disposable diaper in a state in which the belt member of the disposable diaper shown in FIG. 1 is cut and unfolded in a flat shape as viewed from the back sheet side. FIG. 3 shows a plan view of the disposable diaper in a state where the front and back of the belt member of the disposable diaper shown in FIG. 1 are inverted and moved to the outer surface side of the diaper body as viewed from the back sheet side. FIG. 4 shows a plan view of the disposable diaper shown in FIG. 3 as viewed from the top sheet side, and FIG. 5 shows a VV cross-sectional view of the disposable diaper shown in FIGS. 3 and 4. In the figure of the present application, the arrow x represents the width direction, the arrow y represents the front-back direction, and the direction perpendicular to the surface formed by the arrows x, y represents the thickness direction z. In FIGS. 2 to 4, the upper side of the drawing corresponds to the front side of the diaper, and the lower side of the drawing corresponds to the rear side of the diaper.

The disposable diaper 1 has a diaper body 2 and a belt member 11. The diaper body 2 is a portion worn so as to cover the wearer's crotch when wearing the diaper, and the belt member 11 is a portion worn so as to cover the left and right hips of the wearer when wearing the diaper. Is.

The disposable diaper 1 and the diaper body 2 have a front-rear direction y and a width direction x. The anteroposterior direction y corresponds to a direction extending in the anteroposterior direction of the wearer's crotch when the diaper is worn. The width direction x means a direction that is on the same surface as the disposable diaper 1 (particularly the diaper body 2) and is orthogonal to the front-back direction y, and corresponds to the left-right direction of the wearer when the diaper is worn. The disposable diaper 1 also has a skin side and an outer side. The skin side means the side facing the skin of the wearer when wearing the diaper, and the outer surface side means the side facing the wearer when wearing the diaper.

The diaper body 2 has an anterior abdomen P, a crotch R, and a back Q in the anterior-posterior direction y. The front abdomen P corresponds to the portion that is applied to the ventral side of the wearer when wearing the diaper, and the back back Q corresponds to the portion that is applied to the back side of the wearer when wearing the diaper. Further, a portion located between the front abdomen P and the back back Q and touching the wearer's crotch is referred to as a crotch R. The front abdomen P, the crotch R, and the back back Q include a portion to which the belt member 11 is fixed when the diaper body 2 is divided into three in the front-rear direction y, and the front abdomen P and the back back Q include the front abdomen P. The portion between the rear portion Q and the rear portion Q where the belt member 11 is not fixed can be the crotch portion R.

The diaper body 2 is provided with an absorber 5 at the crotch portion R. The absorber 5 may be provided at least in the crotch portion R, and is preferably provided extending from the crotch portion R to the anterior abdomen P and / or the back back Q. In the diaper body 2, it is preferable that the absorber 5 is arranged between the top sheet 3 and the back sheet 4 in the thickness direction z. The top sheet 3 is a sheet located on the wearer side when the diaper is worn, and is arranged on the skin surface side of the absorber 5. The top sheet 3 is preferably liquid permeable. The back seat 4 is a seat located on the side opposite to the wearer, that is, on the outside when the diaper is worn, and is arranged on the outer surface side of the absorber 5. The back sheet 4 is preferably liquid impermeable. The urine or the like excreted from the wearer passes through the top sheet 3 and is housed by the absorber 5, and the back sheet 4 prevents the excrement from leaking to the outside.

Examples of the liquid-permeable top sheet 3 include non-woven fabrics formed of hydrophilic fibers such as cellulose, rayon, and cotton, and polyolefins (for example, polypropylene and polyethylene), polyesters (for example, PET), and polyamides (for example, nylon). ) Etc., and a non-woven fabric formed from hydrophobic fibers such as), wherein the surface of the hydrophobic fibers is hydrophilized by a surfactant or the like can be used. Further, as the top sheet 3, a woven cloth, a knitted cloth, a perforated plastic film or the like may be used.

As the liquid-impermeable backsheet 4, a non-woven fabric formed of hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon), a plastic film, or the like is used. be able to. The back sheet 4 may be composed of a laminate of two or more sheets, and for example, a laminate of a non-woven fabric and a plastic film may be used. In this case, at least one sheet constituting the laminated body may be liquid-impermeable, and the sheets constituting the laminated body may have the same size or different sizes. Liquid impermeable also includes the meaning of water repellency.

The absorber 5 is not particularly limited as long as it contains an absorbent material capable of absorbing excrement such as urine. As the absorber 5, for example, a molded body obtained by molding an absorbent material into a predetermined shape can be used. The absorber 5 may be covered with a covering sheet such as a paper sheet (for example, tissue paper or thin paper) or a liquid permeable non-woven fabric. Examples of the absorbent material include hydrophilic fibers such as pulp fibers and water-absorbent resins such as polyacrylic acid-based, polyaspartic acid-based, cellulosic-based, and starch / acrylonitrile-based. Further, the water-absorbent material may include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and heat-sealing fibers such as polyamide fibers. These heat-sealing fibers may be hydrophilized with a surfactant or the like in order to enhance the affinity with urine or the like.

The absorbent material preferably contains hydrophilic fibers from the viewpoint of increasing the absorption rate of urine and the like. Further, from the viewpoint of increasing the absorption capacity, the absorbent material preferably contains a water-absorbent resin. Therefore, the absorber preferably contains hydrophilic fibers (particularly pulp fibers) and a water-absorbent resin. In this case, for example, it is preferable to use an aggregate of hydrophilic fibers mixed or sprayed with a water-absorbent resin.

The absorber 5 may be a sheet-shaped absorber. Examples of the sheet-shaped absorber include those formed so as to have a water-absorbent resin between the non-woven fabrics and not to have pulp fibers. Since the sheet-shaped absorber thus formed has a water-absorbent resin between the non-woven fabrics, a high absorption capacity can be realized. Further, since the sheet-shaped absorber does not have pulp fibers between the non-woven fabrics, it can be formed thin without being bulky.

The sheet-shaped absorber may use a water-absorbent fiber as an absorbent material. Also in this case, the sheet-like absorber is formed thin without being bulky. Examples of the water-absorbent fiber include fibers containing a protonated or salt-formed carboxyl group. For example, a water-absorbent fiber can be obtained by hydrolyzing an acrylic fiber to convert a nitrile group contained in the acrylic fiber into a carboxyl group. At this time, it is preferable that the carboxyl group contained in the water-absorbent fiber forms an alkali metal salt or an ammonia salt. Further, the water-absorbent fiber can be produced by immersing the hydrophilic fiber in acrylic acid and precipitating acrylic acid on the fiber surface.

The shape (planar shape) of the absorber 5 is not particularly limited. The shape of the absorber 5 may be appropriately determined according to the intended use, and examples thereof include a rectangle, an hourglass shape, and a battledore shape. The absorber 5 is formed in an hourglass shape, that is, a constricted shape in the middle portion in the front-rear direction y from the viewpoint of being sandwiched between the thighs of the wearer and being pressed in the width direction x so as not to be distorted. Is preferable.

It is preferable that rising flaps 6 are provided on both sides of the top sheet 3 in the width direction x (see FIG. 5). By providing the rising flap 6, it is possible to prevent lateral leakage of excrement such as urine. For the rising flap 6, for example, the side sheets 7 extending in the front-rear direction y are joined to both sides of the top sheet 3 in the width direction x, and the standing elastic member 8 is provided on the inner side of the side sheet 7 in the width direction x. It can be formed by providing it. By providing the side seat 7 and the standing elastic member 8 in this way, the inner side of the side seat 7 in the width direction x rises toward the wearer's skin due to the contraction force of the standing elastic member 8, and the rising flap 6 rises. It is formed. The rising flap 6 or the side sheet 7 can be made of a sheet material that can be used for the back sheet 4, and is preferably made of, for example, a liquid-impermeable plastic film or a liquid-impermeable non-woven fabric.

In the rising flap 6 (that is, the inner side of the width direction x of the side sheet 7), the inner surface of the end portion in the front-rear direction y may be joined on the top sheet 3, thereby moving the urine or the like outward in the front-rear direction y. Leakage is prevented.

When a non-woven fabric is used as each of the sheet materials described above, it is preferable to use a spunbonded non-woven fabric, an air-through non-woven fabric, a point-bonded non-woven fabric, a melt-blown non-woven fabric, an air-laid non-woven fabric, an SMS non-woven fabric, or the like. Mass per unit area of each sheet is preferably from 10 g / ^{m 2} or more, 12 g / ^{m 2} or more, and also preferably 40 g / ^{m 2} or less, 30 g / ^{m 2} or less is more preferable.

Elastic members for legs extending in the front-rear direction y may be provided on both sides of the crotch portion R of the diaper body 2 in the width direction x (not shown). By providing the elastic member for the leg, gathers can be formed around the leg of the wearer to improve the fit around the leg and prevent lateral leakage. It is preferable that the elastic member for the leg is provided so that at least a part thereof is located outside the absorber 5 in the width direction x.

As the elastic member provided in the disposable diaper 1, an elastic elastic material used for a normal disposable diaper such as polyurethane thread, polyurethane film, and natural rubber can be used. The elastic member is preferably attached in a stretched state using a known joining means such as an adhesive (for example, hot melt adhesive) or welding (for example, ultrasonic welding). For example, a polyurethane yarn having a fineness of 40 to 1,240 dtex is stretched to a magnification of 1.1 to 5.0 times, arranged, and fixed. As the joining means, a rubber-based hot melt adhesive is preferably used. The magnification is 1.0 times in the non-stretched state.

The shape (planar shape) of the diaper body 2 is not particularly limited. Examples of the shape of the diaper body 2 include a rectangle, an hourglass shape, a battledore shape, and the like. The diaper body 2 has an hourglass shape, that is, the crotch portion R is narrower than the anterior abdomen P and the back back Q, because the diaper body 2 is sandwiched between the wearer's thighs and is not easily distorted even when pressed in the width direction x. It is preferably formed in.

Belt members 11 are attached to one side and the other side of the width direction x on the outer surface side of the diaper body 2. Specifically, the right side belt member 11A and the left side belt member 11B are attached to the outer surface side of the diaper body 2. In the disposable diaper 1 shown in the drawing, the outer surface side of the diaper body 2 is composed of the back seat 4, and the belt member 11 is attached to the back seat 4. The belt member 11 is attached so as to connect the front abdomen P and the back back Q of the diaper body 2, and the waist opening for passing the wearer's torso by the front abdomen P, the back back Q, the right belt member 11A, and the left belt member 11B. The portion can be formed, and the leg opening for passing the wearer's leg can be formed by the crotch portion R and the right side belt member 11A or the left side belt member 11B.

In the belt member 11, one side in the front-rear direction y is fixed to the front abdomen P, and the other side in the front-rear direction y is fixed to the back back Q. As shown in FIGS. 2 to 4, the belt member 11 is located between the anterior fixing area 12 fixed to the anterior abdomen P, the posterior fixing area 13 fixed to the posterior back Q, and the diaper body. It has a belt intermediate region 14 that is not fixed to 2, the front fixed region 12 and the belt intermediate region 14 are separated by a front boundary line 15, and the rear fixed region 13 and the belt intermediate region 14 are separated by a rear boundary line 16. It is divided. In FIG. 3, the front fixed area 12 and the rear fixed area 13 are shown by cross-hatching. The front boundary line 15 is formed so as to include an inclined line extending inward in the width direction x and outward in the front-rear direction y (hereinafter, the inclined line is referred to as a "front inclined line"), and is rearward. The side boundary line 16 is formed so as to include an inclined line extending inward in the width direction x and outward in the front-rear direction y (hereinafter, the inclined line is referred to as a “rear inclined line”). By attaching the belt member 11 to the diaper body 2 in this way, the belt member 11 can be positioned on the outer surface side of the diaper body 2 (back sheet 4) as shown in FIG. 3, and the belt member 11 can be shown in FIG. The belt member 11 can be positioned around the waist of the disposable diaper 1 as shown in FIGS. 1 and 2 by inverting the front and back of the belt intermediate region 14 from the state of being folded. As shown in FIG. 3, the disposable diaper 1 can be easily manufactured by attaching the belt member 11 so as to overlap the outer surface side of the diaper main body 2 at the time of manufacturing.

The belt member 11 may be made of a sheet material that can be used for the top sheet 3 and the back sheet 4. The belt member 11 may have elasticity. In that case, the belt member 11 may be provided with an elastic member (belt elastic member), or the belt member 11 may be composed of an elastic sheet. In the former case, the belt member 11 is configured by, for example, arranging elastic members between the non-woven fabrics.

The front side fixing area 12 and the rear side fixing area 13 of the belt member 11 are areas where the belt member 11 is fixed to the diaper body 2, and the belt member 11 may be fixed to the diaper body 2 by a known joining means. .. The front side fixing region 12 and the rear side fixing area 13 of the belt member 11 may be adhered to the diaper body 2 by, for example, an adhesive, or may be welded to the diaper body 2 by heat sealing or ultrasonic welding. These may be used in combination. On the other hand, the belt intermediate region 14 is located between the front fixing region 12 and the rear fixing region 13 of the belt member 11, and the belt member 11 is not fixed to the diaper body 2 in the region.

In the front fixed region 12 and the rear fixed region 13, the belt member 11 may be joined to the diaper body 2 over the entire surface of the region, and the belt member 11 is partially (for example, in a predetermined joining pattern) the diaper main body. It may be joined to 2. When the belt member 11 is joined to the diaper body 2 with an adhesive, the adhesive may be applied to the entire surface in the front fixing area 12 and the rear fixing area 13, or a predetermined shape such as a net shape, a linear shape, or a scattered point shape may be applied. It may be applied in a pattern. For example, when the adhesive is applied in a linear adhesive pattern, the linear adhesive pattern may be linear or curved (for example, meandering linear or spiral). It may be a combination of.

The front fixed region 12 is formed so that the posterior edge of the front-rear direction y defines the front boundary line 15, and the rear fixed region 13 is formed so that the front edge of the front-rear direction y defines the rear boundary line 16. It is formed. The front boundary line 15 is formed to include a front inclined line extending inward in the width direction x and outward in the front-rear direction y, and the belt member 11 is formed so as to be folded back at the front inclined line. The rear boundary line 16 is formed to include a rear inclined line extending inward in the width direction x and outward in the front-rear direction y, and the belt member 11 is formed so as to be foldable at the rear inclined line. When the belt member 11 is not folded back at the front side inclination line and the rear side inclination line, the belt intermediate region 14 is arranged so as to overlap the crotch portion R of the diaper body 2 and is folded back along the front side inclination line and the rear side inclination line. Therefore, the belt intermediate region 14 can be positioned around the waist of the disposable diaper 1. In order to facilitate the folding back of the belt member 11, it is preferable that 70% or more of the total length of the front boundary line 15 is formed from the front inclined line, and the ratio is more preferably 80% or more and 90%. The above is more preferable. As shown in FIGS. 2 and 3, it is particularly preferable that the front boundary line 15 is entirely formed from the front inclined line. Similarly, 70% or more of the total length of the rear boundary line 16 is preferably formed from the rear inclined line, and the ratio is more preferably 80% or more, further preferably 90% or more. It is particularly preferable that the rear boundary line 16 is entirely formed from the rear inclined line, as shown in FIGS. 2 and 3. From the point of view that the front boundary line 15 and the rear boundary line 16 include the front side inclination line or the rear side inclination line and can be easily formed in a desired shape, the belt member is formed by the front side boundary line 15 and the rear side boundary line 16. It is preferable that 11 is welded to the diaper body 2.

The front fixed region 12 is preferably provided so as to extend to or near the front edge of the belt member 11. Therefore, the front side edge of the front side fixed region 12 is preferably in a region within 15 mm from the front side edge of the belt member 11, more preferably 10 mm or less, and further preferably 5 mm or less. Further, it is preferable that the entire front side edge of the front side fixed region 12 is in such a region. The rear fixing region 13 is preferably provided so as to extend to or near the rear edge of the belt member 11. Therefore, the rear side edge of the rear side fixing region 13 is preferably in a region within 15 mm from the rear side edge of the belt member 11, more preferably within 10 mm, still more preferably within 5 mm. Further, it is preferable that the entire rear edge of the rear fixed region 13 is in such a region.

The length of the front fixed region 12 in the front-rear direction y is 5 mm or more longer than the length of the front boundary line 15 in the front-rear direction y (the length of the front boundary line 15 from the front end to the rear end in the front-rear direction y). It is preferable, 10 mm or more is more preferable, and 15 mm or more is further preferable. Similarly, the length of the rear fixed region 13 in the front-rear direction y is the length of the rear boundary line 16 in the front-rear direction y (the length of the rear boundary line 16 from the front end to the rear end in the front-rear direction y). ), 5 mm or more is preferable, 10 mm or more is more preferable, and 15 mm or more is further preferable. If the front side fixing area 12 and the rear side fixing area 13 are provided in this way, the belt member 11 can be easily firmly fixed to the diaper body 2. On the other hand, the upper limit of the length of each of the front fixed region 12 and the posterior fixed region 13 in the front-rear direction y is not particularly limited, but may be, for example, 250 mm or less, or 200 mm or less. Further, the length of each of the front fixed region 12 and the rear fixed region 13 in the width direction x is preferably 70% or more, more preferably 80% or more of the length of the belt member 11 in the width direction x. 90% or more is more preferable.

In the present invention, the various lengths, positions, and angles of the disposable diaper are such that the elastic member provided on the disposable diaper (when the elastic member is provided on the disposable diaper) is completely extended, that is, the elastic member is removed. The measurement is performed in a state where the elastic member is cut into small pieces or in a state where the contractile force of the elastic member is not exhibited.

The belt intermediate region 14 is a portion of the belt member 11 that is movably formed with respect to the diaper body 2 with the front boundary line 15 and the rear boundary line 16 as base points, and is worn when the disposable diaper 1 is worn. It is used to be located around the left and right hips of a person. In the disposable diaper 1, the belt member 11 is attached to the diaper body 2 so that the belt intermediate region 14 extends diagonally upward when the diaper is worn. Therefore, when the angle formed by the front inclined line of the front boundary line 15 with respect to the front-rear direction y is an angle α and the angle formed by the rear inclined line of the rear boundary line 16 with respect to the front-rear direction y is an angle β. , The angle α and the angle β are both more than 45 ° and 75 ° or less. If the belt member 11 is attached to the diaper body 2 in this way, the diaper body 2 is suspended by the belt member 11, and the diaper is less likely to slip off when the diaper is worn. In addition, it becomes easy to form a large leg opening formed by the crotch portion R of the diaper body 2 and the belt member 11. On top of that, in the disposable diaper 1, the angle β is formed larger than the angle α. If the disposable diaper 1 is formed in this way, the belt intermediate region 14 extends diagonally upward at the back back Q when the diaper is worn, so that the back back Q of the diaper body 2 is pulled up along the buttocks. The diaper body 2 is brought into close contact with the wearer's buttocks, resulting in excellent fit. Therefore, it is possible to prevent the leakage of excrement from the back side of the diaper. The angle β is preferably 50 ° or more, more preferably 55 ° or more, more preferably 70 ° or less, and even more preferably 65 ° or less. On the other hand, the angle α is preferably 48 ° or more, more preferably 50 ° or more, preferably 68 ° or less, more preferably 63 ° or less, still more preferably 60 ° or less. Further, the angle β is preferably larger than the angle α by 2 ° or more, more preferably 3 ° or more, and further preferably 5 ° or more.

The belt member 11 is preferably attached to the diaper body 2 so that the rear end of the rear boundary line 16 is located inward in the front-rear direction y with respect to the rear edge 10 of the diaper body 2. If the belt member 11 is attached to the diaper body 2 in this way, the diaper body 2 can widely cover the wearer's buttocks, and when the diaper is worn, the rear end portion of the diaper body 2 ( The portion of the diaper body 2 located outside the rear boundary line 16 in the front-rear direction y) is supported by the belt member 11, and the rear end portion of the diaper body 2 is less likely to bend back to the outer surface side of the diaper. Specifically, the rear end of the rear boundary line 16 is 10 mm or more inward (more preferably 20 mm or more inward, more preferably 30 mm or more) in the front-rear direction y with respect to the rear side edge 10 of the diaper body 2. It is preferably located inward). The length of the rear end of the rear boundary line 16 from the rear edge 10 of the diaper body 2 is a straight line extending in the front-rear direction y from the rear end of the rear boundary line 16 as the starting point of the diaper body 2. It means the length of the straight line until it reaches the trailing side edge 10.

It is also preferable that the belt member 11 is attached to the diaper body 2 so that the front end of the front boundary line 15 is located inward in the front-rear direction y with respect to the front edge 9 of the diaper body 2. In this case, the diaper body 2 can cover the wearer's ventral side widely, and when the diaper is worn, the front end of the diaper body 2 (in the diaper body 2, the front-back direction y from the front boundary line 15). The portion located on the outer side of the diaper is supported by the belt member 11, and the front end portion of the diaper body 2 is less likely to bend back to the outer surface side of the diaper. Specifically, the front end of the front boundary line 15 is 10 mm or more inward in the front-rear direction y (more preferably 25 mm or more inward, and further preferably 50 mm or more inward) with respect to the front side edge 9 of the diaper body 2. It is preferably located at. The length of the front end of the front boundary line 15 from the front edge 9 of the diaper body 2 is such that a straight line extending in the front-rear direction y from the front end of the front boundary line 15 reaches the front edge 9 of the diaper body 2. It means the length of the straight line until it is completed.

The belt member 11 is preferably provided so that the rear end of the rear boundary line 16 is located inward in the front-rear direction y of the diaper body 2 with respect to the front end of the front boundary line 15. That is, the distance from the rear edge 10 of the diaper body 2 at the rear end of the rear boundary line 16 is longer than the distance from the front edge 9 of the diaper body 2 at the front end of the front boundary line 15. Is preferable. The separation distance means a separation distance with respect to the front-rear direction y, and includes a case where the separation distance is 0 mm. When the belt member 11 is attached to the diaper body 2 in this way, when the diaper is worn, the dorsal side of the diaper is more likely to be covered by the diaper body 2 than the ventral side of the wearer. Therefore, when the wearer takes a bending posture toward the front side, the diaper body 2 is less likely to be disturbed on the ventral side of the wearer, and when the wearer is sleeping in the supine position, the diaper body 2 is from the back side of the diaper. Leakage of excrement is less likely to occur.

The disposable diaper 1 is preferably formed so that the length of the belt intermediate region 14 in the front-rear direction y is shorter than the length of the diaper body 2 in the front-rear direction y. _{Specifically, the length L 1} in the front-rear direction y from the front end of the front boundary line 15 to the rear end of the rear boundary line 16 is 95% or less of _{the length L 2 in} the front-rear direction y of the diaper body 2. It is preferable that it is formed so as to be. By configuring the disposable diaper 1 in this way, the diaper body 2 covers a wide range from the ventral side to the dorsal side including the wearer's crotch, and is shorter than the length y in the front-back direction of the diaper body 2. The belt intermediate region 14 formed by the diaper can enhance the fit of the wearer's waist circumference. Therefore, when the diaper is worn, the disposable diaper 1 is preferably held around the wearer's crotch and waist, and excrement such as urine is less likely to leak. _{The length L 1} in the front-rear direction from the front end of the front boundary line 15 to the rear end of the rear boundary line 16 is preferably 93% or less, preferably 90% or less of _{the length L 2 in} the front-rear direction y of the diaper body 2. The following is more preferable, and 87% or less is further preferable. _{On the other hand, from the viewpoint of ensuring the waist length of the disposable diaper 1, the length L 1} in the front-rear direction from the front end of the front boundary line 15 to the rear end of the rear boundary line 16 is the length L 1 of the diaper body 2. It is preferably 50% or more, more preferably 60% or more, further preferably 70% or more, and even more preferably 75% or more _{of the length L 2 in} the anterior-posterior direction y. The length in the front-rear direction y from the front end of the front boundary line 15 to the rear end of the rear boundary line 16 is the front edge of the rear fixed region 12 from the front edge of the rear fixed region 13. It means the length to the end.

The diaper body 2 preferably includes a straight portion whose rear side edge 10 extends in the width direction x, and the straight portion preferably has 50% or more of the length of the diaper body 2 in the width direction x. When the diaper body 2 is formed in this way, the diaper body 2 can widely cover the back side of the wearer at the rear end portion. Further, since the belt intermediate region 14 is formed so as to extend diagonally upward from the rear back portion Q of the diaper main body 2, when the diaper is worn, both sides of the rear end portion of the diaper main body 2 in the width direction x are belt members. Covered by 11, it becomes easy to improve the adhesion of the rear end portion of the diaper body 2 to the wearer's skin. It is also preferable that the diaper body 2 is formed so that the front side edge 9 includes a straight portion extending in the width direction x, and the straight portion has 50% or more of the length of the diaper body 2 in the width direction x. In this case, the diaper body 2 can widely cover the wearer's ventral side at the front end, and the belt member 11 enhances the adhesion of the front end of the diaper body 2 to the wearer's skin. Is possible. The straight portion extending in the width direction x included in the front side edge 9 and / or the rear side edge 10 of the diaper body 2 preferably has a length of 60% or more of the length of the width direction x of the diaper body 2, and is 70. % Or more is more preferable, and 80% or more is further preferable. The front side edge 9 and / or the rear side edge 10 of the diaper body 2 may be formed entirely of straight portions extending in the width direction x. The length of the straight line portion described here means the length at which the straight line portion extends continuously. Further, the straight portion is preferably formed so as to pass through the center of the diaper body 2 in the width direction x.

The anterior boundary 15 and / or the posterior boundary 16 is preferably formed so as to overlap the absorber 5. If the front boundary line 15 and / or the rear boundary line 16 is formed in this way, the rigidity of the front boundary line 15 and the rear boundary line 16 of the diaper body 2 is increased. Therefore, even if the diaper body 2 is pulled by the belt member 11 at the front boundary line 15 or the rear boundary line 16 when the diaper is worn, the diaper body 2 is less likely to bend at the front boundary line 15 or the rear boundary line 16. , The feeling of wearing a diaper is improved. Preferably, both the anterior boundary line 15 and the posterior boundary line 16 are formed so as to overlap the absorber 5. Further, from the viewpoint of stably fixing the belt member 11 to the diaper body 2, it is preferable that the front fixing region 12 and / or the rear fixing region 13 is formed so as to overlap the absorber 5, and the front fixing region 12 and the rear fixing region 12 and the rear are preferably formed. It is more preferable that both of the side fixed regions 13 are formed so as to overlap with the absorber 5.

It is preferable that the front fixed region 12 and / or the posterior fixed region 13 is formed so that the length in the front-rear direction y is longer on the outer side than on the inner side in the width direction x. The outer side of the belt member 11 in the width direction x is easily affected by the movement of the wearer's legs when the diaper is worn. Therefore, the length of the front fixed region 12 and / or the posterior fixed region 13 in the front-rear direction y is formed longer on the outer side of the width direction x, and the front fixed region 12 and / or the posterior fixed region 13 is wide. By forming the belt member 11 so as to have a wider area on the outer side of the direction x, the belt member 11 can be prevented from peeling off from the diaper body 2 when the diaper is worn. Preferably, both the front fixed region 12 and the posterior fixed region 13 are formed so that the length in the front-rear direction y is longer on the outer side than on the inner side in the width direction x.

The posterior fixed region 13 is preferably formed in a larger area than the anterior fixed region 12. In the disposable diaper 1, the dorsal portion is stretched when the wearer takes a bending posture toward the front side, and in this case, the force of the belt member 11 peeling from the diaper body 2 in the posterior fixed region 13 is likely to act greatly. Become. This tends to be a larger force than the peeling force acting on the front fixed region 12 when the wearer takes a posture of leaning back to the rear side. Therefore, by providing the rear fixing area 13 in a larger area than the front fixing area 12, the belt member 11 can be stably fixed to the diaper body 2.

The belt member 11 is preferably stretchable from the viewpoint of enhancing the fit around the waist of the disposable diaper 1. In this case, it is preferable that the belt member 11 has elasticity in the front-rear direction y at least in the belt intermediate region 14. In order to form the belt member 11 in this way, it is preferable to provide an elastic member for the belt extending in the front-rear direction y at least in the belt intermediate region 14 of the belt member 11.

When the belt member 11 is provided with the elastic member for the belt and the elastic member for the leg is provided on both sides of the diaper body 2 in the width direction x, the elastic member for the belt is provided with a stronger contraction force than the elastic member for the leg. Is preferable. By providing the elastic member for the belt and the elastic member for the leg in this way, the fit around the waist of the wearer is improved when wearing the diaper, and the elastic member for the leg is hard to hit around the wearer's leg. It is possible to improve the wearing feeling of the diaper. The contraction force of each elastic member is measured as follows. First, the elastic member attached to the disposable diaper is stretched, and the stretch length L of the elastic member is measured in a state where the disposable diaper is completely unfolded as shown in FIG. Next, the contraction force of the elastic member is obtained by measuring the contraction force when the elastic member is removed from the disposable diaper and extended to a length L. When a plurality of each elastic member is provided, the contraction force of the plurality of elastic members is obtained.

The length of the belt member 11 in the front-rear direction y is preferably formed to be the same as or shorter than the length of the diaper body 2 in the front-rear direction y. When the belt member 11 has elasticity, it is preferable that the length y in the front-rear direction in the stretched state of the belt member 11 is formed in this way.

The length of the belt member 11 in the width direction x (the length of each of the right belt member 11A and the left belt member 11B in the width direction x) is preferably 50% or less of the length of the diaper body 2 in the width direction x. The right side belt member 11A and the left side belt member 11B are preferably provided on the diaper body 2 so as not to overlap each other. The right belt member 11A and the left belt member 11B are also preferably provided so as to be separated by 3% or more of the length x in the width direction of the diaper body 2. If the belt member 11 is provided in this way, the diaper body 2 is pulled in the width direction x by the belt member 11 when the diaper is worn, and the diaper body 2 is moved in the width direction x on the ventral side or the dorsal side of the wearer. It becomes easier to spread. The length of the belt member 11 in the width direction x is preferably 20% or more, more preferably 30% or more, still more preferably 35% or more of the length of the diaper body 2 in the width direction x. Further, the separation distance between the right side belt member 11A and the left side belt member 11B is more preferably 5% or more, more preferably 50% or less, and more preferably 40% or less of the length x in the width direction of the diaper body 2. , 30% or less is more preferable. The separation distance between the right side belt member 11A and the left side belt member 11B described here means the separation distance at the portion where the right side belt member 11A and the left side belt member 11B are closest to each other in the width direction x.

The belt member 11 is preferably formed in a rectangular shape, for example. In this case, the production of the disposable diaper 1 can be simplified. The belt member 11 is also formed in a shape in which the inner edge of the belt intermediate region 14 in the width direction x bulges outward in the width direction x in a state where the belt intermediate region 14 is located on the outer surface side of the diaper body 2. It is also preferable. In this case, the belt intermediate region 14 is formed so as to include, for example, a portion where the inner edge in the width direction x curves outward in the width direction x. Since the inner edge of the belt intermediate region 14 in the width direction x forms the upper edge of the belt member 11 around the wearer's waist when the diaper is worn, the belt intermediate region 14 is formed in this way. When wearing a diaper, the upper edge of the belt member 11 is less likely to bend downward, and the feeling of wearing the diaper can be improved.

In the disposable diaper 1 shown in the drawing, the front side edge 9 and the rear side edge 10 of the diaper body 2 are formed from straight portions extending in the width direction x, and the front side boundary line 15 and the rear side boundary line 16 of the belt member 11 are formed. The disposable diaper of the present invention is formed so as to be located inward in the front-rear direction y from the front side edge 9 and the rear side edge 10 of the diaper body 2, but the front side edge and the rear side edge of the diaper body are the width of the diaper. Even if it is formed including an inclined side portion extending outward in the direction and inward in the front-rear direction, and a belt member is attached to the diaper body along the inclined side portion of the front side edge and the rear side edge. Good.

1: Disposable diaper 2: Diaper body 3: Top sheet 4: Back sheet 5: Absorber 11: Belt member, 11A: Right belt member, 11B: Left belt member 12: Front fixed area 13: Rear fixed area 14: Belt Intermediate region 15: Front border 16: Rear border

Claims (8)

A diaper body having an anterior abdomen and a posterior back and a crotch located between them in the anterior-posterior direction, and an absorber provided in the crotch.
A disposable diaper having a belt member attached to one side and the other side in the width direction on the outer surface side of the diaper body.
The belt member is attached so as to connect the anterior abdomen and the posterior back of the diaper body, and is fixed between the anterior fixed region fixed to the anterior abdomen and the posterior fixed region fixed to the posterior back. It has a belt intermediate region that is located and is not fixed to the diaper body, the front fixed region and the belt intermediate region are separated by a front boundary line, and the rear fixed region and the belt intermediate region are separated by a rear boundary line. When worn, the belt member is positioned around the waist of the disposable diaper by inverting the front and back of the belt intermediate region from the state where the belt member is overlapped on the outer surface side of the diaper body. A waist opening for the wearer's torso and a leg opening for the wearer's legs are formed.
The front boundary line is formed to include a front slope line extending inward in the width direction and outward in the front-rear direction.
The rear boundary line is formed to include a rear inclined line extending inward in the width direction and outward in the front-rear direction.
When the angle formed by the front inclined line with respect to the front-rear direction is an angle α and the angle formed by the rear inclined line with respect to the front-rear direction is an angle β, both the angle α and the angle β are 45 °. A disposable diaper characterized in that it is super 75 ° or less and the angle β is larger than the angle α. The disposable diaper according to claim 1, wherein the rear end of the rear boundary line is located inward in the front-rear direction with respect to the rear edge of the diaper body. The length in the front-rear direction from the front end of the front boundary line to the rear end of the rear boundary line is 50% or more and 95% or less of the length of the diaper body in the front-rear direction. The disposable diaper described in 2. The one according to any one of claims 1 to 3, wherein the rear side edge of the diaper body includes a straight portion extending in the width direction, and the straight portion has 50% or more of the length of the diaper body in the width direction. Disposable diapers. A claim that the distance from the rear edge of the diaper body at the rear end of the rear boundary is longer than the distance from the front edge of the diaper body at the front end of the front boundary. The disposable diaper according to any one of 1 to 4. Claims 1 to 5 in which the front fixed region and / or the rear fixed region of the belt member is formed so that the length in the front-rear direction is longer on the outer side than on the inner side in the width direction. Disposable diaper according to any one of the above. The absorber is provided extending from the crotch portion to the anterior abdomen and / or the posterior back portion, and the anterior boundary line and / or the posterior boundary line is formed so as to overlap with the absorber. The disposable diaper according to any one of 1 to 6. The disposable diaper according to any one of claims 1 to 7, wherein the belt member is elastic.

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