JP5573806B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  The disposable diaper is an absorbent article that is worn so as to wrap around the wearer's torso, and includes an absorbent body for absorbing and holding excrement.

  In the disposable diaper as described above, the stretched stretchable material is fixed. This stretchable material is fixed for the purpose of improving the feeling of wearing and fitting and preventing leakage of excrement from the opening or edge of the diaper.

However, simply fixing the stretchable stretchable material can impart stretchability to the stretchable material fixing portion, but the flexibility, cushioning properties, and the like may be insufficient. For example, there were the following problems.
1) Tightening with an elastic material is too strong and rubber marks (timer marks) are attached to the wearer's skin.
2) Since the stretchable material fixing part is likely to become hard due to the application of adhesive or the heat fusion of the stretchable material, the flexibility and tactile feel of the diaper is impaired.
3) If the elastic material fixing part is hard, not only the wearer's own skin but also the fingers of the person performing the replacement work may be damaged.

  Therefore, in the disposable diaper, various proposals have been made to improve flexibility, cushioning properties, etc. while imparting stretchability to the stretchable material fixing portion. For example, the outer layer sheet, the inner layer sheet, and a plurality of elastic members form an outer packaging material for the absorbent article, and the outer layer sheet and the inner layer sheet are intermittently formed in the trunk periphery direction and the orthogonal direction thereof. A pants-type absorbent article joined to each other has been proposed. In this absorbent article, the elastic member is arranged so as not to pass through the joint (see Patent Documents 1 to 5).

  In this pant-type absorbent article, the elastic member is configured not to be fixed to the outer layer sheet and the inner layer sheet. A plurality of ridges extending from the outer end portion of the waist portion to the inner end portion are formed on the entire circumference of the waist portion.

JP 2008-136793 A JP 2008-136794 A JP 2008-142316 A JP 2008-142341 A JP 2008-142342 A

  The pants-type absorbent articles described in Patent Documents 1 to 5 are formed by shrinking the outer layer sheet and the inner layer sheet in the waist circumferential direction by an elastic member to form a plurality of ridges. And it is thought that the convex curved surface formed of the said wrinkles gives volume in the thickness direction of an exterior sheet and an inner layer sheet | seat, and is aiming at improving the softness | flexibility, cushioning property, etc. of an elastic material arrangement | positioning part.

  However, the above structure is a special structure in which an elastic member is arranged so as not to pass through the intermittent joint portion between the exterior sheet and the inner layer sheet. In this structure, the elastic member is not restricted by any of the exterior sheet and the inner layer sheet, and can be freely extended. For example, even when the elastic member is disposed at a stretch rate of 300% at the time of manufacture, the elastic member may stretch locally exceeding the stretch rate of 300% at the time of use. That is, the elastic member may extend excessively beyond an ideal expansion rate. Therefore, there is a problem that the elastic member that is tightly stretched may come into contact with the skin through the inner layer sheet to cause pain and discomfort. Furthermore, in order to obtain the special structure described above, a precise joining technique is required at the time of manufacture, and there is a problem that the manufacture is difficult.

  The present invention has been made in view of the problems of the prior art as described above. Specifically, the present invention provides a disposable diaper that can be easily manufactured while providing a comfortable wearing feeling without excessive stretching of the elastic material.

  The inventor has intensively studied in order to solve the above problems. As a result, 1) an expansion / contraction part that expands / contracts the diaper body in the waist direction is formed, 2) a gather-forming sheet that covers the expansion / contraction part is disposed at a position overlapping the expansion / contraction part, and 3) in the waist direction The stretched portion in the stretched state and the gather forming sheet are joined intermittently toward the waistline direction, and 4) a fastening tape is joined at a position overlapping the stretchable portion and the gather forming sheet. Thus, the present invention has been completed by conceiving that the above-mentioned problems can be solved. Specifically, the following disposable diapers are provided by the present invention.

[1] After enveloping the inseam of the wearer and enveloping the inseam enveloping part in which the absorbent body is disposed, the front enveloping part enclosing the front of the wearer's torso, and the back of the wearer's torso A diaper main body formed from each part of the enveloping part, an expansion / contraction part formed so as to expand / contract one of the front enveloping part and the rear enveloping part in the trunk circumference direction, and the expansion / contraction A gather-forming sheet that is disposed at a position that overlaps with the part and forms a gather that covers the stretchable part, a left fastening tape that extends to the left in the waist direction from the left edge of the one enveloping part, and the It consists of a right fastening tape that extends to the right in the trunk direction from the right edge of one enveloping part, and is provided with a fastening material, and the one encapsulating part is fastened to the other encapsulating part. A fastening tape, and the stretchable part in a state of being stretched in the direction of the waist, and the gather And forming the sheet are joined via a joint that has been formed intermittently toward the waist direction, the extendable portion, and the diaper main body is formed by a stretchable nonwoven fabric of separate, one direction The stretchable nonwoven fabric in a state stretched to the gathered sheet and the gather-forming sheet are joined via the joint portion formed intermittently toward the one direction, whereby the stretchable nonwoven fabric and the A gather band integrally formed with a gather forming sheet is formed, and the gather band has a waist circumference with respect to the one enveloping portion so that the one direction coincides with the waist circumference direction. continuously toward, and are entirely bonded, the left fastening tape is joined to a position overlapping the stretchable portion and the left side edge portion of the gather forming sheet, the left fastening tape, Joined serial stretch unit and directly on at least one of the left edge of the gather forming sheet Rutotomoni, the right fastening tape is joined to a position overlapping the stretchable portion and the right edge of the gather forming sheet, wherein A disposable diaper in which a right fastening tape is directly joined to the right edge of at least one of the stretchable part and the gathered sheet .

[ 2 ] The gather band is configured to be wider than the width of the one enveloping part in the trunk surrounding direction, and extends to the left in the trunk circumferential direction from the left edge of the one encapsulation part. And the left fastening tape is joined to the skin contact surface of the one enveloping part so as to have a right extending part located on the right side in the waist direction from the right edge of the one enveloping part. The disposable diaper according to [ 1 ], wherein the gathering band is joined to the left extension portion, and the right fastening tape is joined to the right extension portion of the gather band.

[ 3 ] A left reinforcing sheet is joined at a position overlapping with the left edge of the gather band, the left fastening tape has its tip directed toward the center in the waist direction, and the fastening material is attached. With the surface facing the gather band side, the right reinforcing sheet is joined to the position overlapping the left edge of the left reinforcing sheet, and the right reinforcing sheet is joined to the position overlapping the right edge of the gather band. The right fastening tape, with its front end facing toward the waist and in the state where the fastening material is attached to the gather band side, the right edge of the left reinforcing sheet; The disposable diaper according to [ 1 ] or [ 2 ], which is bonded to the overlapping position.

[ 4 ] A joint between the left edge of the gather band and the left reinforcing sheet is formed at a position overlapping the joint between the left fastening tape and the left reinforcing sheet, and the right side of the gather band. The disposable diaper according to [ 3 ], wherein a joint portion between an edge portion and the right reinforcing sheet is formed at a position overlapping with a joint portion between the right fastening tape and the right reinforcing sheet.

[ 5 ] The gathered band is formed by integrally forming a stretchable nonwoven fabric in which stretched stretchable materials are disposed between layers of a plurality of nonwoven fabric sheets, and the gather-forming sheet. portion to be bonded to the encapsulation portion of said one, said in a state of being contracted to a length of 40% to 90% relative to the original size of the nonwoven fabric sheet, it said is joined to the encapsulation portion of said one [1] - The disposable diaper according to any one of [ 4 ].

  In the disposable diaper of the present invention, since the gather forming sheet is joined to the stretchable part, the stretchable material constituting the stretchable part is not excessively stretched and a comfortable wearing feeling can be obtained.

  Further, since the gather forming sheet is intermittently joined to the stretchable portion, the gather forming sheet 82 is bent and deformed into a corrugated shape as the stretchable portion 80 contracts as shown in FIGS. 1D and 1E. A gather 88 is formed. The gather 88 provides a cushioning function like an air cushion, and the gather inner space 86 improves air permeability. This structure can be manufactured by intermittently joining a gathered sheet to the stretchable part. Therefore, the disposable diaper of this invention can be manufactured easily.

  Furthermore, since the gathers are formed by the gather forming sheet that floats from the stretchable part, the gathers are easily deformed and the shape followability is excellent as compared with the case where the gathers are formed by the stretchable part itself. That is, the gather fit to the wearer's skin is high. Therefore, even when the wearer performs a sitting operation, a crawling operation, a roll-over operation, etc., the gathers can easily follow the wearer's skin, and diaper displacement can be prevented.

  Furthermore, since the stretchable part is covered with the gather forming sheet, it is difficult for the hard touch feeling such as the stretchable material constituting the stretchable part and the adhesive for fixing the stretchable material to be transmitted to the wearer's skin. Therefore, a soft tactile sensation can be given to the wearer's skin.

  Moreover, since the fastening tape is joined to the position overlapping with the stretchable part and the gather forming sheet, the force for pulling the fastening tape when the diaper is attached is directly transmitted to the stretchable part and the gather forming sheet. Therefore, it is easy to fit the gathers to the wearer's skin when the diaper is worn. Furthermore, there is an effect that the gathers can easily follow the operation of tilting the body forward while the wearer is sitting.

It is a schematic plan view which shows typically one Embodiment of the disposable diaper of this invention. It is a schematic end view which shows typically the lamination | stacking state of the member of the A-A 'cutting | disconnection end surface of the disposable diaper shown to FIG. 1A. It is a schematic back view of the disposable diaper shown to FIG. 1A. It is a perspective view which shows typically the expansion-contraction part vicinity of the disposable diaper shown to FIG. 1A. It is a schematic end view which shows typically the X-X 'cut end surface of the disposable diaper shown to FIG. 1D. It is a schematic plan view which expands the expansion-contraction part of a disposable diaper shown to FIG. 1A, a gathers formation sheet, and a junction part, and cuts off a part of gathers formation sheet, and is shown typically. The form of a junction part is shown. It is a schematic plan view which expands the expansion-contraction part of the disposable diaper of this invention, a gathers formation sheet, and a junction part, cuts off a part of gathers formation sheet, and is shown typically. The form of the junction part different from the form shown to FIG. 1F is shown. It is a schematic plan view which expands the expansion-contraction part of the disposable diaper of this invention, a gathers formation sheet, and a junction part, cuts off a part of gathers formation sheet, and is shown typically. The form of the junction part different from the form shown to FIG. 1F or FIG. 2A is shown. It is a schematic plan view which expands the expansion-contraction part of the disposable diaper of this invention, a gathers formation sheet, and a junction part, cuts off a part of gathers formation sheet, and is shown typically. The form of the junction part different from the form shown in FIG. 1F, FIG. 2A, or FIG. 2B is shown. It is a schematic plan view which shows typically the gather band of the disposable diaper shown to FIG. 1A. FIG. 3B is a schematic end view schematically showing an A-A ′ cut end surface of the gather band shown in FIG. 3A. FIG. 3B is a schematic end view schematically showing a B-B ′ cut end surface of the gathered band shown in FIG. 3A. FIG. 3B is a schematic end view schematically showing a C-C ′ cut end face of the gather band shown in FIG. 3A. It is a schematic back view of the gather band shown in FIG. 3A. It is a schematic plan view which shows typically the gather band and fastening tape of a disposable diaper shown to FIG. 1A. FIG. 4B is a schematic end view schematically showing an A-A ′ cut end surface of the gather band and the fastening tape shown in FIG. 4A. It is a schematic plan view which shows typically another embodiment of the disposable diaper of this invention. FIG. 5B is a schematic end view schematically showing a stacked state of members on the A-A ′ cut end face of the disposable diaper shown in FIG. 5A. It is a schematic plan view which shows typically another embodiment of the disposable diaper of this invention. FIG. 6B is a schematic end view schematically showing a stacked state of members on the A-A ′ cut end face of the disposable diaper shown in FIG. 6A. It is a schematic back view of the disposable diaper shown to FIG. 6A.

  Hereinafter, the form for implementing the disposable diaper of this invention is demonstrated concretely. However, the present invention widely includes disposable diapers having predetermined specific items. Therefore, the present invention is not limited to the disposable diaper specifically shown below.

[1] Characteristic configuration of the present invention:
The disposable diaper of this invention is at least (1) the diaper main body 70, (2) the expansion-contraction part 80, (3) the gather formation sheet 82, and (4) stop like the disposable diaper 1 shown to FIG. 1A-FIG. 1C. A receiving tape 11 is provided as a constituent element.

[1-1] Diaper body:
As shown in FIGS. 1A to 1C, the diaper body 70 is formed from (a) a crotch envelope portion 4, (b) a front envelope portion 2, and (c) a rear envelope portion 6.

[1-1A] Inseam enveloping part:
As shown in FIG. 1A to FIG. 1C, the crotch enveloping portion 4 is a portion where the crotch of the wearer is encapsulated in the diaper main body 70 and the absorber 22 is disposed. That is, the crotch envelope has a function of absorbing and holding excrement.

  In the disposable diaper 1 shown in FIGS. 1A to 1C, a diaper main body 70 is formed in an hourglass shape (a shape having a wide waist end edge 70c, 70d side and a narrow constriction on the crotch side). In this case, between the straight line connecting the constriction starting points on the side of the waist edge 70c (that is, the front end of the diaper main body) and the straight line connecting the constriction starting points of the waist end edge 70d (that is, the rear end of the diaper main body) side. The region is referred to as “inseam enveloping portion”.

  It does not specifically limit about the structure of an absorber, The absorber used for a conventionally well-known absorbent article can be used. A specific configuration of the absorber will be described later. In the present invention, an absorbent body may be arranged in addition to the crotch enveloping part. For example, as shown in FIGS. 1A to 1C, the absorber 22 may be disposed in the front enveloping part 2 and the rear enveloping part 6.

[1-1B] Front enveloping part and rear enveloping part:
As shown in FIGS. 1A to 1C, the front envelope part 2 is a part of the diaper main body 70 that encloses the front of the wearer's torso, and the rear envelope part 6 is the wearer's torso of the diaper main body 70. This is the part that encloses the surrounding back.

  As described above, in the disposable diaper 1 shown in FIGS. 1A to 1C, the diaper main body 70 is formed in an hourglass shape. Therefore, an area between the waist end edge 70c (that is, the front end of the diaper main body) and a straight line connecting the constriction starting points on the side of the waist end edge 70c is referred to as a “front covering portion”. On the other hand, a region between the waist end edge 70d (that is, the diaper main body rear end) and a straight line connecting the constriction starting points on the waist end edge 70d side is referred to as a “rear envelope”.

[1-2] Stretchable part:
As shown in FIGS. 1A to 1C, the expansion / contraction part 80 expands / contracts one of the front envelope part 2 and the rear envelope part 6 (the rear envelope part 6 in the illustrated example) in the waist direction. It is the part formed so that it may make it. The stretchable portion has a function of forming a gather by bending and deforming the gather forming sheet by the shrinkage force of the stretchable material (rubber, thermoplastic elastomer, etc.) constituting the stretchable portion.

  “One of the front and rear envelope portions” means either one or both of the front and rear envelope portions. However, as shown in FIGS. 1A to 1C, it is preferable that an expansion / contraction part 80 for extending / contracting the rear covering part 6 in the trunk periphery direction is formed. When gathers are formed on the back envelope side, the gathers fit against the wearer's back. Therefore, it is difficult to form a gap between the wearer's back and the diaper, and leakage of soft stool is prevented.

  The “trunk circumference direction” refers to a direction surrounding the wearer's trunk when the wearer wears a diaper. In other words, it is the width direction (left-right direction) of the front encapsulation part or the rear encapsulation part. In the disposable diaper 1 shown in FIGS. 1A to 1C, the expansion / contraction part 80 so as to contract the rear envelope part 6 in a direction parallel to the waist edge 70 c (or in a direction orthogonal to the left edge 70 a and the right edge 70 b). Is formed.

  "Forming to expand and contract in the direction around the trunk" means that it is not sufficient to simply form the stretchable part, and the stretchable direction of the stretchable part needs to be along the trunk circumference of the one enveloping part Means. For example, a linear stretchable material easily stretches in the longitudinal direction and hardly stretches in the short direction. In the case where the stretchable portion is configured using the stretchable material that easily stretches in a specific direction as described above, it is necessary to form the stretchable portion so that the specific direction is along the trunk circumference direction. The disposable diaper 1 shown in FIG. 1A to FIG. 1C has an elastic part that expands and contracts in the waistline direction by arranging a linear elastic material (in this example, an elastic material) in parallel with the waist edge 70c of the back envelope part 6. 80 is formed.

  However, as long as the one enveloping part expands and contracts in the direction around the trunk, it is not necessary that the direction around the trunk and the expansion and contraction direction of the stretchable part 80 match completely as in the disposable diaper 1 shown in FIGS. 1A to 1C. . For example, a linear elastic material may be arranged so as to draw a convex curve upward or downward with respect to a direction parallel to the waist edge.

  In addition, the expansion-contraction part should just be "formed so that one enveloping part may be expanded-contracted in the trunk periphery direction". That is, it is not necessary that the expansion / contraction part is formed in “one enveloping part” itself. For example, as shown in FIGS. 1A to 1C, a stretchable nonwoven fabric 58 separate from the diaper main body 70 and a gather band 78 integrally formed with a gather forming sheet 82 are provided. 80 may be formed. The specific configuration of the gather band will be described later.

  The stretchable part can be formed of a stretchable nonwoven fabric. For example, in the stretchable portion 80 shown in FIGS. 1A to 1C, a stretched linear stretchable material 56 is disposed between two nonwoven fabric sheets 52 and 54. Further, a linear elastic material 56 is fixed to the two nonwoven fabric sheets 52 and 54. And the two nonwoven fabric sheets 52 and 54 and the elastic material 56 are formed by the elastic nonwoven fabric 58 which behaves integrally. With such a structure, unlike the pants-type absorbent articles of Patent Documents 1 to 5, the elastic material does not extend beyond the sheet width. That is, the stretchable material is not stretched excessively beyond the ideal stretch rate.

  However, the stretchable nonwoven fabric forming the stretchable portion does not necessarily have the configuration shown in FIGS. 1A to 1C. For example, the number of nonwoven fabric sheets for fixing the stretchable material is not limited to two, and may be three or more.

  Moreover, as a stretchable nonwoven fabric, a stretchable film may be fixed to the nonwoven fabric sheet, and the nonwoven fabric sheet and the stretchable film behave integrally. Such a stretchable nonwoven fabric also has the same effect as the stretchable nonwoven fabric 58 having the structure shown in FIGS. 1A to 1C. This form includes not only one in which an elastic film is disposed between two nonwoven fabric sheets but also one in which an elastic film is disposed on the surface of one nonwoven sheet.

  Further, as the stretchable nonwoven fabric, the nonwoven fabric itself may be stretchable. For example, a commercially available elastic nonwoven fabric, elastomer spunbond nonwoven fabric, etc. can be used. Specifically, Straflex (produced by Idemitsu Unitech Co., Ltd.), Espancione (produced by KB Seiren Co., Ltd.) and the like can be suitably used under the trade names below. These elastic nonwoven fabrics and elastomer spunbond nonwoven fabrics are stretchable by themselves.

  As described above, the “stretchable nonwoven fabric” referred to in the present specification includes a stretchable material bonded to a nonstretchable nonwoven fabric sheet and the nonwoven fabric itself has stretchability. Are also widely included.

  Disposable diapers often have a structure in which an elastic material is disposed between layers of a nonwoven fabric sheet. Therefore, it is not always necessary to separately provide a stretchable nonwoven fabric. That is, you may utilize a part of structure of the conventional disposable diaper as an expansion-contraction part. For example, when a waist elastic material is arranged between the layers of a plurality of non-woven sheets constituting the post-encapsulating part, that part can be used as an elastic part.

[1-3] Gather forming sheet:
As shown in FIGS. 1A to 1C, the gather forming sheet 82 is a sheet-like member that is disposed at a position overlapping the stretchable portion 80. The gather forming sheet has a function of forming a gather covering the stretchable part.

  “Arranged at a position overlapping with the expansion / contraction part” means that the position of the expansion / contraction part and the arrangement position of the gathering sheet overlap. The disposable diaper 1 shown in FIGS. 1A to 1C includes a gathered band 78 in which a stretchable nonwoven fabric 58 separate from the diaper main body 70 and a gather forming sheet 82 are integrally configured. A portion 80 is formed. Therefore, the position of the expansion / contraction part 80 and the arrangement position of the gather formation sheet 82 are completely overlapped. Such a form is preferable in that the function of the gathered sheet for covering the stretchable part can be sufficiently exhibited.

  In the present invention, unlike the disposable diaper 1 shown in FIGS. 1A to 1C, the position of the stretchable part 80 and the arrangement position of the gather forming sheet 82 do not have to completely overlap. However, it is preferable to arrange the gathered sheet so as to cover 60% or more of the width of the stretchable part (the length in the direction parallel to the waist edge).

  The gather forming sheet is preferably disposed on the skin contact surface of the stretchable part. The “skin contact surface” means a surface that directly contacts the wearer's skin when the disposable diaper is worn, that is, an innermost surface of the disposable diaper. By arranging the gather forming sheet on the skin contact surface of the stretchable part, the flexibility and fit of the wearer with respect to the skin can be improved.

  The constituent material of the gather-forming sheet is preferably a nonwoven fabric, and more preferably a water-repellent nonwoven fabric. By using the water-repellent nonwoven fabric, excrement leaking through the gathered sheet is less likely to occur. As the “water-repellent nonwoven fabric”, the same material as the side sheet described later can be used.

The basis weight of the gathered sheet is preferably 8 to 50 g / m ² . If it is less than 8 g / m ² , the gather that comes into contact with the skin is too thin, the gather is not stiff, and the effect of improving the fit is difficult to obtain. On the other hand, if it exceeds 50 g / m ² , 1) the sheet is too rigid and difficult to bend in conjunction with the contraction of the elastic material, making it difficult to form a gather structure. 2) The sheet is too bulky and the skin There is a risk that the gathers that come into contact with the garment will be awkward and the feeling of wear will be reduced.

  The gather forming sheet may be formed with a hole for communicating the inner space of the diaper and the inner space of the diaper (referring to a space formed between the gather forming sheet and the stretchable part). By adopting such a structure, moisture flows from the inner space of the diaper into the gather space through the hole, and the moisture that has passed through the gather space is discharged to the outer space of the diaper.

  The “hole” means an opening that allows communication between the inner space of the diaper and the space in the gathers, and the shape thereof is not particularly limited. For example, shapes such as a circle, an ellipse, and a polygon (triangle, square, etc.) can be mentioned.

  The “hole” includes not only one that is always open, but also one that can be opened and closed. For example, a hole having a tongue piece that functions as a valve can be formed by forming slits having convex trajectories or a plurality of intersecting slits on the gather forming sheet. The tongue piece allows moisture to pass through while preventing urine and body fluid from entering the gathered space.

  The form of the slit is not particularly limited. Examples of the “slit having a convex locus” include a) a slit having a curved portion (such as an inverted U-shaped slit) and b) a slit having a bent portion (such as an inverted V-shaped slit). Examples of “a plurality of intersecting slits” include c) a cross-shaped slit formed by intersecting two slits, and d) a star-shaped slit formed by intersecting three slits. Can do.

  Further, a plurality of holes may be formed in the gather forming sheet. By forming a plurality of holes, the air permeability is improved and the moisture is easily discharged to the outside of the diaper.

The specific number of “plurality” is not particularly limited. It depends on the opening area of the hole. If the opening area is 0.5 to 10 mm ² , 5 to ²⁰⁰ holes are preferably formed, more preferably 10 to 100 holes. The effect of improving air permeability can be obtained by setting the number to 5 or more. On the other hand, by setting it to 200 or less, it is possible to effectively prevent urine and body fluid from flowing into the gather space.

  It is also a preferable form that the medicine is attached to the gathered sheet. By attaching the drug, it is possible to impart a medicinal effect based on the drug to the gathered sheet that is in direct contact with the skin of the wearer.

  The type of drug is not particularly limited. For example, in addition to having a moisturizing agent (aloe extract, propylene glycol, etc.) and a moisturizing effect, an additive for skin care (eucalyptus extract etc.) having urease inhibitory activity can be mentioned. Further, disinfectants, antibacterial agents (edetacetic acid, benzalkonium chloride, etc.), deodorants (various polyphenol compounds, etc.) and the like can be mentioned.

[1-4] Fastening tape:
As shown in FIGS. 1A to 1C, the fastening tape 11 includes a left fastening tape 11A and a right fastening tape 11B. The left fastening tape 11 </ b> A extends to the left in the trunk direction from the left edge 70 a of one of the encapsulating parts (rear enveloping part 6). Then, the right fastening tape 11B extends to the right in the trunk direction from the right edge 70b in one of the enveloping portions (the rear enveloping portion 6). That is, the left and right fastening tapes make a pair. The fastening tape has a function of fastening one encapsulation part (for example, the rear encapsulation part) to the other encapsulation part (for example, the front encapsulation part).

[1-5] Relationship between stretchable part and gathered sheet:
In the disposable diaper of the present invention, as shown in FIGS. 1A to 1C, the stretchable portion 80 in a state of being stretched in the waistline direction and the gather forming sheet 82 are intermittently formed toward the waistline direction. It is joined via the joint 84.

  The “expanded and contracted portion” means a stretched portion in a state where a contracting force is acting. For example, a stretchable nonwoven fabric in which stretched stretchable materials are disposed between layers of a plurality of nonwoven fabric sheets is in a state of being shrunk from its original size in a natural state, and no shrinkage force is acting. Therefore, such a stretchable nonwoven fabric is joined to the gathered sheet in a stretched state from the contracted state. On the other hand, stretchable nonwoven fabrics, elastic nonwoven fabrics, or elastomeric spunbonded nonwoven fabrics, etc., in which a stretchable film is fixed to a nonwoven fabric sheet, are in their original size in a natural state (a state where no tension is applied), and shrinkage force acts. Not. Accordingly, the gather-forming sheets are joined in a state where these stretchable nonwoven fabrics and the like are stretched from the original size.

  The expansion / contraction part and the gathering sheet are joined by joining the surface of the expansion / contraction part and the gathering sheet.

  “Intermittently” means that the joint is formed discontinuously or intermittently. In this joined state, the stretchable part and the gathered sheet are inseparable from each other at the joined part. On the other hand, in the non-joined part, the stretchable part and the gather forming sheet are not restrained each other and are in a state of being freely separated.

  In the present invention, the gather forming sheet or the gap between one joint and the other joint in the stretchable part contracts to form a gather. Therefore, it is preferable that the space | interval of joining parts shall be 2-50 mm toward the trunk periphery direction, and it is especially preferable to set it as 5-10 mm.

  Note that “intermittent” may be intermittent in the direction around the trunk (that is, the contraction direction of the stretchable portion). In other words, there is no particular limitation as to what shape the joining portion is formed in a direction (orthogonal direction) perpendicular to the trunk periphery direction. However, it is preferable that the joining portion is continuously formed in the orthogonal direction. Such a form can form the gather which goes in the said orthogonal direction, and is excellent in the touch and air permeability. For example, there can be mentioned joints formed continuously in the orthogonal direction and at regular intervals with respect to the trunk circumference direction.

  FIG. 1F is a schematic plan view schematically showing the stretchable portion 80, the gather forming sheet 82, and the joining portion 84 of the disposable diaper 1 shown in FIGS. 1A to 1C, with a part of the gather forming sheet 82 cut out. is there. As shown in FIG. 1F, the joint portion 84 includes a plurality of linear joint portions 90 that extend in the orthogonal direction (the vertical direction in the drawing). And the linear junction part 90 is intermittently formed toward the trunk periphery direction. Furthermore, each of the linear joint portions 90 is a form in which a plurality of dot-like joint portions 92 are formed as an aggregate arranged in a row in the orthogonal direction.

  In the example shown in FIG. 1F, the linear joint 90 is oriented in the orthogonal direction. Therefore, compared with the case where it is orientated toward the waist direction, moisture and the like can easily flow in the orthogonal direction, and exhaust of moisture and the like from the waist edge side of the diaper can be promoted. Moreover, it is easy to make a diaper follow the curvilinear shape around a wearer's trunk | drum, and it is excellent also in fitting property and a feeling of wear.

  In the present specification, the term “linear” widely includes shapes extending in the orthogonal direction, and includes shapes such as strips and strips in addition to so-called linear shapes. In addition, in order for a plurality of dot-like joints to be recognized as an “aggregate”, it is necessary that the distance between adjacent dot-like joints be 5 mm or less.

  Moreover, the form shown to FIG. 2A is the same as the form shown to FIG. 1F, and the structure of an expansion-contraction part is the same, and the form of a junction part differs. The joint portion 84A includes a plurality of linear joint portions 90A that extend in the orthogonal direction. And 90 A of linear junction parts are intermittently formed toward the trunk periphery direction. Furthermore, the linear joint 90A is formed as an aggregate of circular dot joints 92A. Therefore, in addition to the effect of the form shown in FIG. 1F, there is an effect that it is difficult to cause pain even when the joint portion 84A, which is likely to have a hard touch, hits the skin.

  Also, the configuration shown in FIG. 2B is the same as the configuration shown in FIG. The joint portion 84B includes a plurality of linear joint portions 90B that extend in the orthogonal direction. And the linear junction part 90B is intermittently formed toward the trunk periphery direction.

  Further, each of the linear joint portions 90B is formed as an aggregate in which a plurality of dot-like joint portions 92B are arranged in a matrix satisfying n <m with n rows in the orthogonal direction and m columns in the waist circumference direction. It is a form that has been. In this form, by setting “n <m”, more dot-shaped joint portions 92B are arranged in the waist direction in each linear joint portion 90B than in the orthogonal direction, and the above-mentioned direction from the waist direction is It is formed in a linear shape with a long orthogonal direction.

  In the example shown in FIG. 2B, the linear joint 90B is formed as an aggregate of circular dot-shaped joints 92B, and the dot-shaped joints 92B are formed as an aggregate arranged in a matrix of 2 rows and 5 columns. Has been.

In the form as described above, it is preferable to form 1 to 30 linear joint portions having a width of 1 to 4 mm and a length of 2 to 80 mm in the orthogonal direction. Each linear joint has a dot-like joint with an area of 1 to 4 mm ² per line arranged in a matrix at intervals of 0.5 to 5 mm in the waist direction and at intervals of 0.5 to 3 mm in the orthogonal direction. It is preferable to make it an aggregate.

  In FIG. 2A and FIG. 2B, it demonstrated by the example which formed the linear junction part as an aggregate | assembly of a dot-like junction part. However, as shown in FIG. 2C, it is also preferable that the joining portion 84C be formed intermittently in the trunk direction and continuously in the orthogonal direction (linear joining portion 90C). The configuration shown in FIG. 2C is the same as the configuration shown in FIG.

  Especially, like the form shown to FIG. 2C, the form formed in the linear form extended in the said orthogonal direction like the junction part 84C, and the junction part 84C are located in a line across the waist edge 70c is preferable. If it is set as such a form, the space in gathers which leads to the interior space of a diaper will be opened toward a waist edge. Accordingly, the inner space and the outer space of the diaper communicate with each other through the gather inner space. That is, it is preferable in that sufficient ventilation can be achieved and exhaust of moisture and the like is promoted.

  From the same idea as the embodiment shown in FIG. 2C, it is preferable to form a plurality of joints aligned in a line so as to ride on a straight line extending in the orthogonal direction as in the embodiment shown in FIGS. 2A and 2B. . Such a form also facilitates the formation of a linear gather continuous in the orthogonal direction, as in the form shown in FIG. 2C. Therefore, it is preferable in that the formed gathers are not easily crushed and the air permeability is easily improved.

  In the disposable diaper of this invention, it is also preferable that the gather formation sheet | seat and the expansion-contraction part are joined by the junction part formed intermittently toward both the circumference direction of the diaper and the said orthogonal direction.

  For example, a plurality of dot-like joints may be arranged in a staggered manner. Even in such a form, in addition to being able to form a gather, a gather internal space that connects the internal space of the diaper and the external space is formed. Therefore, the air permeability can be improved as well as the form shown in FIGS. 2A to 2C as well as the flexibility and the shape following ability.

[1-6] Gather band:
As shown in FIGS. 1A to 1C and 3A to 3E, the disposable diaper of the present invention is a gather band in which a stretchable nonwoven fabric 58 separate from the diaper main body 70 and a gather forming sheet 82 are integrally formed. 78 is preferably provided. In this form, the stretchable nonwoven fabric constituting the gather band constitutes the stretchable part. Therefore, even if the expansion / contraction part is not formed in the diaper main body, a gather can be formed.

  As shown in FIGS. 3A to 3E, the gather band 78 is a joint in which a stretchable nonwoven fabric 58 in a state of being stretched in one direction and a gather-forming sheet 82 are intermittently formed in the one direction. It is joined via the part 84. And the gather band 78 is joined to one enveloping part (rear enveloping part 6) so that one direction (namely, the expansion-contraction direction of the elastic nonwoven fabric 58) may correspond with the trunk periphery direction.

  The gather band 78 shown in FIGS. 1A to 1C is continuously and entirely bonded to one enveloping part (rear enveloping part 6) in the circumferential direction. Such a form can impart the stretchability of the gather sheet to one of the encapsulating parts.

However, as a reference example, the gather band may be intermittently joined to one of the enveloping portions in the direction around the trunk. For example, a hot melt adhesive is applied intermittently (for example, in the form of stripes) to one of the enveloping portions in the circumferential direction of the trunk, and the gather band is joined. Thereby, a clearance gap is formed between one enveloping part and a gather band, and air permeability and cushioning properties can be improved.

Further, as a reference example, only the end edge portion of the gather band on the waist end edge side may be joined, and the end edge portion on the crotch side may be unjoined. Such a configuration can form a pocket structure in which the left and right three-dimensional gathers and gather bands are combined to open to the crotch side. The pocket structure has an effect of trapping soft stool.

  The joining of the gather band and one enveloping part is preferably joining with a hot melt adhesive. In this case, the hot melt adhesive may be applied to the gather band or may be applied to one of the encapsulated portions.

  As shown in FIGS. 1A to 1C, the gather band 78 is preferably configured to be wider than the width of the one enveloping portion (the rear enveloping portion 6) in the trunk periphery direction. And the left extension part 60 extended from the left side edge 70a of one enveloping part to the left side of the trunk direction and the right extension part 62 located on the right side of the trunk part direction from the right edge 70b of one of the encapsulation parts. It is preferable that it is joined to the skin contact surface of one enveloping part so that it may have.

  The said form can expand / contract freely regardless of the joining state of the left extension part and right extension part of a gather band with one enveloping part. That is, the behavior of the left extension part and the right extension part is not restricted by one of the encapsulating parts. Therefore, it is easy to follow the movement of the wearer, and the fit can be improved. Moreover, even if the left extension part and the right extension part extend and contract greatly and rub against the skin of the wearer, mechanical irritation is reduced by the gathers formed on the surface. It is preferable that the left extension part or the right extension part is extended by 10 to 150 mm from the side edge of one enveloping part.

  However, as shown in FIG. 6A to FIG. 6C, the gather band 78 is configured to be narrower than the width of the one enveloping part (the rear enveloping part 6) in the trunk periphery direction, and the left extension part and the right extension part May not be included. Even if it is such a form, the effect of the soft improvement by a gather and improvement of air permeability can be acquired.

  In the disposable diaper 1 shown in FIGS. 1A to 1C, a gather band 78 includes a stretchable nonwoven fabric 58 in which stretched stretchable material 56 is disposed between a plurality of nonwoven fabric sheets 52 and 54, and a gather forming sheet 82. It is structured. In such a form, the part joined to one enveloping part among gather bands is joined to one enveloping part in the state contracted to 40 to 90% length with respect to the original size of a nonwoven fabric sheet. It is preferable that

  When the diaper is attached, the fastening tape is pulled to both sides, so that the one enveloping part is extended to the original size. Since the gather band is always in a contracted state, the embodiment has an advantage that a gather is formed even if the one encapsulating portion is extended to the original size. In such a form, the gather band as shown in FIG. 6A to FIG. 6C is configured to be narrower than the width of the one enveloping part in the trunk periphery direction, and does not have a left extension part and a right extension part. It is valid.

  "The state in which the length of the nonwoven fabric sheet is contracted to 40 to 90%" means that the gather band is longer than the natural length (that is, in a fully contracted state) and the original size of the nonwoven fabric sheet (that is, the maximum size) (Long) is a specific definition of a state of contraction to have a shorter dimension. If the gather band is joined to one of the encapsulating portions in the above state, the gather band cannot be fully stretched, and the stretchability of the stretchable nonwoven fabric cannot be exhibited 100%. However, when the stretchable nonwoven fabric is contracted, the gather forming sheet can be bent to form a gather. Further, even if one of the enveloping portions is extended to the original size as described above, the gather band (and hence the gather forming sheet) is still in a contracted state, and a gather is formed. In this embodiment, the gather band may be intermittently joined to one enveloping part or may be continuously joined to one enveloping part.

  As shown in FIGS. 1A to 1C, the gather band 78 is preferably configured as a continuous body from the left side edge part to the right side edge part of one enveloping part (rear enveloping part 6). In such a form, since gathers are also formed in the middle part of the one enveloping part in the trunk circumference direction, it is difficult to form a gap on the back side of the diaper. Therefore, it is possible to effectively prevent loose stool leakage that has passed through the groin.

  However, the gather band may be divided into left and right. For example, a left gather band is attached to the left edge of one enveloping part, a right gather band is attached to the right edge of one enveloping part, and the gather band is located at the center of the one enveloping part around the trunk It is good also as a form which does not exist.

  Further, in the gather band 78 shown in FIGS. 1A to 1C, the stretchable material 56 is continuously arranged except for the arrangement site of the fastening tape 11. However, a portion where the stretchability is not exhibited may be formed in a part of the gather band by cutting the stretchable material in the middle.

  The disposable diaper 1 shown to FIG. 1A-FIG. 1C arrange | positions one continuous gather band from the left side edge part of one enveloping part (rear enveloping part 6) to a right side edge part. However, when the size is large like an adult diaper, two gather bands may be arranged in parallel. Even in this case, the basic configuration of the gather band is the same. According to the size of the diaper and the number of gather bands, the gather band size, the arrangement pitch of the stretchable material, and the like may be appropriately adjusted.

  In the disposable diaper of this invention, it is preferable that the gather band 78 is arrange | positioned at the skin contact surface of one enveloping part (rear enveloping part 6), as shown to FIG. 1A-FIG. 1C. According to this form, the contact area of the gathers with respect to a wearer's skin can be increased, and the effect of a soft skin contact and a fit improvement becomes large.

  However, in a form in which the gather band has a left extension part and a right extension part, the gather band may be arranged on the outermost surface of one enveloping part. Even in such a form, it is possible to obtain an effect of improving stretchability in the left extension part and the right extension part. Moreover, in this form, the gathers formed in the left extension part and the right extension part are exposed on the skin contact surface side. Therefore, even if the left extension part and the right extension part greatly expand and contract and rub against the wearer's skin, mechanical stimulation is reduced.

  In the disposable diaper of the present invention, as shown in FIGS. 1A to 1C, the gather band 78 is separated from the waist edge 70 c of one enveloping part (rear enveloping part 6), and is disposed slightly on the crotch side. Also good. In a manufacturing process, since it cuts | disconnects between adjacent disposable diapers individually, in order to avoid cutting the gather band 78, the space | interval of a waist edge and the edge of a gather band shall be 4-50 mm. preferable.

  Moreover, it is preferable that the both ends edge of the gather formation sheet | seat which comprises a gather band is folded in the surface side or back surface side of the elastic nonwoven fabric which comprises a gather band. When the edge of the gather forming sheet is exposed at the end of the gather band, the edge and the wearer's skin rub against each other as the gather band expands and contracts, giving mechanical stimulation to the wearer's skin. There is a fear.

  The length of the gather band in the direction (orthogonal direction) orthogonal to the trunk circumference direction is not particularly limited. What is necessary is just to set suitably according to the size of a diaper, the number of gather bands, etc. The disposable diaper 1 shown to FIG. 1A-FIG. 1C is a diaper for infants, and the one gather band 78 is arrange | positioned. If it is such a form, it is preferable that the length to the said orthogonal direction of a gather band shall be 20-100 mm.

[1-7] Relationship between stretchable part and gather forming sheet and fastening tape:
In the disposable diaper of this invention, as shown to FIG. 1A-FIG. 1C, the left fastening tape 11A is joined to the position which overlaps with the expansion-contraction part 80 and the left side edge part of the gathers formation sheet 82. FIG. The right fastening tape 11 </ b> B is joined to a position overlapping the right and left edge portions of the stretchable portion 80 and the gather forming sheet 82.

  In the structure as described above, the force pulling the fastening tape is directly transmitted to the stretchable part and the gathering sheet. Therefore, there is an effect that the gather can be easily fitted to the wearer's skin when the diaper is worn. Even if the wearer sits down and moves the body forward, the back gathers follow, and the back side gap is filled. In addition, since the contraction force of the expansion / contraction part is directly transmitted to the fastening tape, the fastening material (such as the hook material of the mechanical fastener) sufficiently penetrates into the material to be secured (such as the loop material of the mechanical fastener). There is an effect that the engaging force is increased.

  In order to obtain the effect more reliably, as shown in FIGS. 1A to 1C, the left fastening tape 11 </ b> A is directly joined to at least one left side edge of the stretchable part 80 and the gather forming sheet 82. Is preferred. And it is preferable that the right fastening tape 11B is directly joined to the right edge of at least one of the expansion-contraction part 80 and the gather formation sheet 82. FIG.

  The disposable diaper 201 shown in FIGS. 6A to 6C is also joined to a position where the left fastening tape 11A overlaps with the stretchable portion 80 and the left edge of the gather forming sheet 82. The right fastening tape 11 </ b> B is joined to a position overlapping the right and left edge portions of the stretchable portion 80 and the gather forming sheet 82. Therefore, there is an effect that the force pulling the fastening tape is directly transmitted to the stretchable part and the gather forming sheet.

  However, the disposable diaper 201 shown to FIG. 6A-FIG. 6C is pinched | interposed between the side sheet | seat 19 and the cover sheet | seat 24 in which the fastening tape 11 comprises one encapsulation part (rear encapsulation part 6). And it is the form which is not joined directly to the at least one side edge part of the expansion-contraction part 80 and the gathers formation sheet 82. FIG.

  In the disposable diaper of the present invention, the fastening tape may be joined to the surface of the stretchable part and the gather-forming sheet side of the gathered sheet, or the fastening tape may be joined to the surface of the stretchable part side. .

  The form in which the fastening tape is joined to the surface of the gather forming sheet side is excellent in the appearance of the diaper because the root side of the fastening tape is not exposed to the outside. On the contrary, the form in which the fastening tape is joined to the surface of the stretchable part is not exposed to the wearer's skin because the root side of the fastening tape is not exposed to the skin contact surface of the wearer. . Any form can be selected in consideration of the advantages of the above forms and the ease of manufacture.

  In the disposable diaper 1 shown in FIGS. 1A to 1C or the disposable diaper 101 shown in FIGS. 5A to 5B, the fastening tape 11 is bonded to the surface of the gather band 78 on the gather forming sheet 82 side. Accordingly, the appearance of the diaper is excellent.

  In the said form, as shown to FIG. 1A-FIG. 1C or FIG. 5A-FIG. 5B, it is preferable that the fastening tape 11 (11A, 11B) is joined to the side edge vicinity of the gather band 78. FIG. In the state before using a diaper, as shown to FIG. 4A and 4B, the fastening tape 11 may be folded by the skin contact surface side of a diaper. In such a state, the user may not be able to see the position of the fastening tape 11 from the outer surface side of the diaper. In such a case, if the fastening tape 11 is joined to the left and right side edges of the gather band 78, particularly the left extension 60 and the right extension 62, the user can use the left and right sides of the gather band 78. The position of the fastening tape 11 can be grasped by touching the edge with a hand.

  In addition, about the part to which a fastening tape is joined among gather bands, it is preferable to make it the state which does not have a stretching property by cut | disconnecting a stretching material. When the fastening tape is joined to the stretchable portion, the wrinkles are likely to approach the joint where the feel is hard, and the wearer may feel a foreign object. Specifically, the stretchable material of the part can be partially broken, or a method of not having stretchability by a technique such as disposing the stretchable material in the part can be exemplified.

  Moreover, it may replace with the said method or may employ | adopt the method of superimposing the non-stretch another raw material on the said part in combination with the said method. For example, in the gather band 78 shown in FIGS. 4A to 4B, the non-stretchable left reinforcing sheet 64 is joined at a position overlapping the left edge (the portion where the left fastening tape 11 </ b> A is joined). In addition, a non-stretchable right reinforcing sheet 66 is joined to a position overlapping the right edge (a portion where the right fastening tape 11B is joined).

  In the disposable diaper of this invention, it is preferable that the left reinforcement sheet 64 is joined to the position which overlaps with the left side edge part of the gather band 78, as shown to FIG. 4A-FIG. 4B. And the left edge of the left reinforcing sheet 64 is in the state where the left fastening tape 11A has its front end directed toward the center of the waist and the surface with the fastening material 48 attached to the gather band 78 side. It is preferable that it is joined at a position overlapping with.

  Similarly, it is preferable that the right reinforcing sheet 66 is joined at a position overlapping the right edge of the gather band 78. And the right edge of the right reinforcing sheet 66 in the state where the right fastening tape 11B is directed to the center in the waist direction and the surface to which the fastening material 48 is attached is directed to the gather band 78 side. It is preferable that it is joined at a position overlapping with.

  The above structure is preferable in that it is easy to continuously produce a gather band to which a fastening tape is attached. Usually, when manufacturing a gather band continuously, a long nonwoven fabric sheet and a long linear elastic material are continuously sent out and manufactured. If it does so, it is necessary to join a fastening tape in parallel with sending directions, such as a long nonwoven fabric sheet, and it is technically difficult.

  Therefore, the structure shown in FIGS. 4A and 4B is manufactured such that a plurality of the structures shown in FIG. 4A and FIG. 4B are continuous in the horizontal direction of the drawing, and the structure shown in FIGS. In this structure, the fastening tape is joined to the gather band in a state where the tip is directed to the center side in the waistline direction. Two fastening tapes that are continuously formed so that the tip side faces backward may be attached so as to straddle adjacent gather bands, and the middle of the two continuously formed fastening tapes may be cut. By doing so, it becomes possible to simultaneously form a large number of gather bands to which fastening tapes are attached, and continuous production of the gather bands to which fastening tapes are attached is facilitated.

  In the example shown in FIGS. 4A and 4B, the left reinforcing sheet 64 and the right reinforcing sheet 66 are entirely bonded to the surface of the side edge portion of the gather band 78. The left reinforcing sheet 64 and the right reinforcing sheet 66 are disposed with the fastening tape 11 facing the front side in the waistline direction and the surface on which the fastening material 48 is attached facing the gather band 78. It is joined to the surface of the side edge. When the fastening tape 11 is developed starting from the joint 68 between the left reinforcing sheet 64 and the right reinforcing sheet 66, the structure shown in FIGS. 1A to 1C is obtained.

  However, the fastening tape and the reinforcing sheet need not be directly joined. For example, a reinforcing sheet, a gather band, and a fastening tape may be laminated in this order, and these members may be joined to each other.

  In the example shown in FIGS. 4A and 4B, the left reinforcing sheet 64 and the right reinforcing sheet 66 are formed to have the same width as the fastening tape 11. However, the reinforcing sheet is preferably formed wider than the fastening tape. This is to make it easier to convey the force when the fastening tape is pulled to the gather band.

  In the example shown in FIGS. 4A and 4B, the joint 69 between the left edge of the gather band 78 and the left reinforcing sheet 64 is formed at a position overlapping the joint 68 between the left fastening tape 11A and the left reinforcing sheet 64. Has been. A joint 69 between the right edge of the gather band 78 and the right reinforcing sheet 66 is formed at a position overlapping the joint 68 between the right fastening tape 11 </ b> B and the right reinforcing sheet 66.

  Such a form is preferable because the gather band, the reinforcing sheet, and the fastening tape can be laminated and joined at one place. The joining method of these members is not particularly limited. For example, a joining method such as heat sealing or ultrasonic sealing can be employed.

  The bonding is preferably performed at a plurality of bonding points. This is because, when bonded in a continuous plane shape, the bonded portion may be cured to an extent comparable to the resin plate. The bonding pattern is not particularly limited. For example, a pattern in which a large number of junction points such as a rectangle, an ellipse, or a circle that are long in the circumferential direction can be formed.

  As for the fastening tape, not only the shape of the fastening tape 11 shown in FIGS. 1A to 1C and 4A to 4B but also a conventionally known fastening tape may be used. The disposable diaper 101 shown in FIGS. 5A to 5B uses a conventionally known fastening tape as the fastening tape 11 in the same configuration as the disposable diaper 1 shown in FIGS. 1A to 1C.

  In the example shown in FIGS. 1A to 1C, the fastening tape 11 and the reinforcing sheets (the left reinforcing sheet 64 and the right reinforcing sheet 66) are configured in a rectangular shape. However, the shape of the fastening tape or the reinforcing sheet is not particularly limited. For example, it may be a trapezoid whose tip is linearly narrowed or a Mt. Fuji shape that is narrowed by drawing a curve, or the tip may be cut into a waveform.

  In the disposable diaper of the present invention, as shown in FIGS. 1A to 1C, the left fastening tape 11 </ b> A is joined to the left extension 60 of the gather band 78, and the right fastening tape 11 </ b> B is the right extension of the gather band 78. It is preferable to be joined to 62. In such a form, by pulling the fastening tape, the left extension part and the right extension part can be sufficiently extended, and the fit of the wearer to the skin can be improved.

[2] Other configurations:
The disposable diaper of this invention is not specifically limited about structures other than the said characteristic structure. For example, the following configuration can be employed.

[2-1] Diaper body:
The diaper main body is composed of a structure in which an absorbent body and various sheets covering the absorbent body are integrally configured. For example, the disposable diaper 1 shown in FIGS. 1A to 1C includes an absorbent body 22 and a diaper body 70 in which a top sheet 18, a side sheet 19, a back sheet 20, and a cover sheet 24 that cover the absorbent body 22 are integrally formed. I have.

[2-1A] Absorber:
An absorber is a structure constituted by an absorptive material. Used to absorb and retain the wearer's urine. Examples of the absorbent material include fluff pulp, super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, and the like. As the fluff pulp, wood pulp or non-wood pulp defibrated, etc., as the SAP, sodium polyacrylate, etc., as the hydrophilic sheet, tissue, absorbent paper, and hydrophilic treatment were performed. It is preferable to use a nonwoven fabric or the like.

  As the absorbent body, it is preferable to use one or two or more absorbent materials formed into a mat shape. The mat may be a single layer or multiple layers. Especially, what combined 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be mixed in the fluff pulp mat, or may be used in the form of a layer between a plurality of fluff pulp mats.

  In order to prevent SAP from falling off and to give shape stability, it is preferable to encapsulate the entire absorbent body with the hydrophilic sheet. For example, the absorber 22 shown in FIGS. 1A to 1C is obtained by encapsulating the upper surface side of the absorber 22 with an upper tissue (not shown), and encapsulating the side surface side and the bottom surface side of the absorber 22 with a lower tissue (not shown). In addition, a form in which the entire absorbent body 22 is encapsulated with a hydrophilic sheet is adopted.

  What is necessary is just to use what was shape | molded in desired shapes, such as rectangular shape and an hourglass shape, according to the objective. For example, the absorber 22 shown in FIGS. 1A to 1C is an example using a rectangular absorber.

[2-1B] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface on the side which opposes a wearer's skin at the time of mounting | wearing of a diaper) may be coat | covered. Since it is necessary to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the wearer is made of a liquid-permeable material.

  Examples of the liquid permeable material include woven fabric, nonwoven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As said nonwoven fabric, the nonwoven fabric manufactured by manufacturing methods, such as air through (card hot air) and card | curd embossing, can be used conveniently. The hydrophilic treatment can be performed by applying, spraying, impregnating, etc., a surfactant to the raw cotton of the nonwoven fabric.

  The top sheet is “at least partially” made of a liquid-permeable material. The position is not particularly limited. However, it is preferable that the part which overlaps with the arrangement position of the absorber in the crotch envelopment part when viewed in plan is made of a liquid-permeable material.

  In addition, in the diaper main body, it is not necessary that the entire surface on the side facing the wearer's skin is covered with the top sheet. For example, as shown in FIGS. 1A to 1C, a top sheet 18 is disposed only at the center of the diaper around the waist, and a side sheet 19 made of a breathable water repellent material is disposed at the side of the diaper around the waist. Also good. As the breathable water repellent material, it is preferable to use a non-woven sheet obtained by a method such as card embossing or spunbonding. In particular, it is preferable to use a non-woven fabric sheet such as SMS or SMMS having a high waterproof property.

[2-1C] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface on the side which turns away from a wearer's skin at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material in order to prevent the wearer's urine from leaking outside the diaper.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorber, for example, as shown in FIGS. 1A to 1C, it is preferable that the back sheet 20 is disposed so as to cover at least the position where the absorber 22 is disposed. .

  Examples of the liquid impermeable material include a liquid impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film is a film in which a large number of fine pores of 0.1 to several μm are formed, and is liquid-impermeable but moisture-permeable. Therefore, it is possible to prevent the diaper internal space from being steamed while ensuring leakage prevention.

  As shown in FIGS. 1A to 1C, a form in which the cover sheet 24 is bonded to the outer surface side of the back sheet 20 may be employed. A cover sheet is a sheet | seat arrange | positioned so that the outer surface of a back sheet may be coat | covered. The cover sheet is disposed for the purpose of reinforcing the back sheet and improving the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[2-2] Solid gather:
The three-dimensional gather is a leak-proof wall that is arranged on the skin contact surface of the diaper and rises three-dimensionally. It is used for the purpose of preventing a lateral excretion of excrement in combination with the leg elastic material by contacting the skin of the wearer. As in the three-dimensional gather 26 shown in FIGS. 1A to 1C, a structure in which the three-dimensional gather stretchable material 36 in an expanded state is sandwiched and fixed between layers of the nonwoven fabric sheet 32 is often used. . With such a structure, the three-dimensional gather 26 stands up three-dimensionally due to the contraction force of the three-dimensional gather expansion / contraction material 36.

  As shown in FIGS. 1A to 1C, the three-dimensional gathers 26 are often arranged in a pair on the left and right sides of the absorber 22. However, two or more pairs of right and left solid gathers may be arranged on both sides of the absorber.

  The material of the nonwoven fabric sheet is not particularly limited. However, similarly to the side sheet, a nonwoven fabric sheet made of a breathable water-repellent material can be suitably used.

  The nonwoven fabric sheet may exclusively form a three-dimensional gather, or may form a three-dimensional gather and other members of the diaper. In the case of a tape-type disposable diaper, as shown in FIGS. 1A to 1C, the three-dimensional gather 26 and the side sheet 19 are often configured by a nonwoven fabric sheet 32 made of a water-repellent nonwoven fabric or the like.

[2-3] Various elastic materials:
In the disposable diaper of the present invention, it is preferable to arrange an elastic material such as a leg elastic material.

[2-3A] Leg elastic material:
A leg elastic material is an elastic material arrange | positioned at a crotch envelope part. Leg gathers are formed in the crotch envelope by the leg stretchable material.

  As shown in FIGS. 1A to 1C, a plurality of linear elastic materials are often used as the leg elastic material 40. Further, in many cases, at least the crotch enveloping portion 4 adopts a form in which a plurality of left and right pairs of linear elastic members are linearly arranged along both side edges of the absorbent body 22.

[2-3B] Configuration of stretchable material, others:
As the stretchable material, a flat rubber made of natural rubber, a thread rubber made of an elastic thread of a synthetic rubber (urethane rubber, etc.) can be suitably used. Moreover, a stretchable net, a stretchable film, a stretchable foam (such as urethane foam), or the like can also be used.

  The stretchable material is preferably fixed in a stretched state of 120 to 400%, and is preferably fixed in a stretched state of 200 to 300%. By setting it as this range, sufficient stretching force can be applied without applying an excessive tightening force to the wearer. The stretchable material can be fixed by adhesion using an adhesive, welding by heat, ultrasonic waves, or the like. As the adhesive, a hot-melt adhesive or other highly fluid adhesive can be used. Examples of the welding method include heat sealing.

  The method for fixing the elastic material is not particularly limited. However, an adhesive may be applied to or sprayed on at least one of the stretchable material and the nonwoven fabric sheet sandwiching the stretchable material, and the like. Examples of the coating method include spiral coating.

  The disposable diaper 1 shown to FIG. 1A-FIG. 1C has fixed the leg elastic material 40 so that it may be pinched | interposed between the side sheet 19 comprised by the nonwoven fabric sheet 32, and the back sheet | seat 20. FIG. However, as shown in FIGS. 1A to 1C, the leg stretchable material 40 may be fixed so as to be sandwiched between the side sheets 19 and the cover sheet 24.

[2-4] Fastening tape:
A fastening material is attached to the fastening tape. The kind of fastening material is not specifically limited. However, it is preferable to use a hook material of a mechanical fastener (planar fastener). Mechanical fasteners are preferable in that they have a high fastening force, and the fastening force is unlikely to be lowered even when the detachment is performed a plurality of times. For example, as shown in FIG. 1A to FIG. 1C, a fastening material 48 is attached in the vicinity of the tip of the base material 50 constituting the fastening tape 11. On the other hand, as shown in FIGS. 1A to 1C, a front patch 13 made of a material to be secured 46 (a loop material of a mechanical fastener) is attached to the front envelope portion 2. By fixing the fixing material 48 to the to-be-fixed material 46, the cylindrical structure surrounding a wearer's trunk | drum can be formed.

  The number of fastening tapes is not particularly limited. However, an appropriate number of fastening tapes may be provided in accordance with the dimensions of the wearer's body shape (specifically, the waist circumference, leg circumference, etc.). In general, a pair of disposable diapers for infants (one each on the left and right) is attached, and a pair of disposable diapers for adults (two on the left and two on the left) are attached.

  The disposable diaper of this invention is demonstrated more concretely, referring drawings. However, the disposable diaper of this invention includes all the disposable diapers provided with the invention specific matter, and is not limited to the following examples.

[Example 1]
As Example 1, a tape-type disposable diaper 1 shown in FIGS. 1A to 1C was produced. This tape-type disposable diaper 1 is an M size for infants, the diaper main body 70 has a length in the front-rear direction of 455 mm, the width of the front enveloping part 2 and the rear enveloping part 6 is 252 mm, and the inseam enveloping part 4 An hourglass shape with a width of 235 mm was formed.

  As shown in FIGS. 3A to 3E, the gather band 78 is configured such that a stretchable nonwoven fabric 58 separate from the diaper main body 70 and a gather forming sheet 82 are integrally formed.

As the nonwoven fabric sheets 52 and 54 constituting the stretchable nonwoven fabric 58, a water-repellent SMS nonwoven fabric sheet having a basis weight of 15 g / m ² was used. The size of the nonwoven fabric sheets 52 and 54 was 62 mm wide × 348 mm long. A stretchable non-woven fabric 58 was obtained by arranging and fixing a thread rubber having a thickness of 480 dtex at a stretch rate of 250% between the non-woven fabric sheets 52 and 54 as the stretchable material 56. Thirteen elastic members 56 were arranged at a pitch of 5 mm.

As the gather forming sheet 82, a polypropylene nonwoven fabric sheet made of a spunbond nonwoven fabric and having a basis weight of 18 g / m ² was used. The gather forming sheet 82 was joined to the skin contact surface of the stretchable nonwoven fabric 58 extended to the original size of the nonwoven fabric sheets 52 and 54 by ultrasonic sealing to form a gather band 78.

  The joint portion 84 is formed by collectively forming a plurality of rectangular joint portions having a width of 0.4 mm and a length of 10 mm, and the rectangular joint portions are spaced by 7 mm in the waist direction and are orthogonal to the waist direction. It was assumed that the electrodes were arranged at intervals of 1 mm.

  The gather band 78 shown in FIGS. 1A to 1C was joined to one enveloping portion (rear enveloping portion 6) continuously and entirely in the direction around the trunk. At this time, the left extension part 60 or the right extension part 62 was joined so as to extend 48 mm from the left edge 70a or the right edge 70b of one envelope part (rear envelope part 6). Moreover, the gather band 78 was spaced apart from the waist edge 70c, and was arrange | positioned a little on the crotch side. The distance between the waist edge 70c and the edge of the gather band 78 was 12 mm.

  The structure of the fastening tape or the like is as shown in FIGS. 4A to 4B. As the left reinforcing sheet 64 and the right reinforcing sheet 66, sheets made of a spunbond nonwoven fabric made of polypropylene were used. The shape was a rectangular shape with a width of 35 mm and a length of 25 mm. As the fastening tape 11, a fastening material 48 was attached to the tip of a base material 50 made of a spunbond nonwoven fabric made of polypropylene. The shape of the base material 50 was a rectangular shape having a width of 35 mm and a length of 29 mm. As the fastening material 48, a hook material of a mechanical fastener was used. The shape was a rectangular shape with a width of 35 mm and a length of 15 mm.

  The gather band 78, the reinforcing sheet (the left reinforcing sheet 64, the right reinforcing sheet 66), and the fastening tape 11 were laminated and joined at one place. An ultrasonic seal was adopted as a joining method. The joining portions 68 and 69 have a pattern in which a large number of joining points of a rectangle (width 1 mm × length 4 mm) long in the trunk circumference direction are formed 4 mm inside from the side edge of the gather band 78.

  The disposable diaper of the present invention can be used as a disposable diaper for an infant or an adult such as an elderly person or a disabled person who needs care, more specifically as a tape-type disposable diaper.

1: Disposable diaper 2: Front enveloping part 4: Crotch enveloping part 6: Rear enveloping part 11: Fastening tape 11A: Left fastening tape 11B: Right fastening tape 13: Front patch 18: Top sheet, 19: Side sheet, 20: Back sheet, 22: Absorbent body, 24: Cover sheet, 26: Solid gather, 32: Non-woven sheet, 36: Solid gather elastic material, 40: Leg elastic material, 46 : Fastening material, 48: Fastening material, 50: Base material, 52, 54: Nonwoven fabric sheet, 56: Stretchable material, 58: Stretchable nonwoven fabric, 60: Left extension part, 62: Right extension part, 64 : Left reinforcing sheet, 66: Right reinforcing sheet, 68, 69: Joint part, 70: Diaper body, 70a: Left edge, 70b: Right edge, 70c, 70d: Waist edge, 78: Gather band, 80: Extendable part , 82: Gather forming sheet, 8 , 84A, 84B, 84C: joint, 86: gathered space, 88: gather, 90, 90A, 90B, 90C: linear joint, 92, 92A, 92B: dot joint, 101, 201: disposable diapers .

Claims (5)

Inseam envelopment part that encloses the inseam of the wearer and in which the absorbent body is arranged, a front envelopment part that encapsulates the front part of the wearer's torso, and a rear envelopment part that encapsulates the back part of the wearer's torso A diaper body formed from each part of
An expansion / contraction part formed so as to expand / contract one of the front enveloping part and the rear enveloping part in the trunk circumference direction;
A gather forming sheet which is disposed at a position overlapping with the stretchable part and forms a gather covering the stretchable part;
From the left fastening tape that extends to the left in the barrel direction from the left edge of the one enveloping part, and the right fastening tape that extends to the right in the trunk direction from the right edge of the one enveloping part A fastening material, and a fastening tape for fastening the one encapsulating part to the other encapsulating part,
The stretchable part in a state of being stretched in the waistline direction and the gather forming sheet are joined via joints formed intermittently in the waistline direction,
The stretchable part is formed of a stretchable nonwoven fabric that is separate from the diaper main body,
The stretchable nonwoven fabric in a state stretched in one direction and the gather-forming sheet are joined together via the joint portion formed intermittently in the one direction, so that the stretchability A gather band formed integrally with the nonwoven fabric and the gather forming sheet is formed,
The gather band is continuously and entirely bonded to the one enveloping portion toward the waist direction so that the one direction matches the waist direction,
The left fastening tape is joined to a position overlapping the left and right edges of the stretchable part and the gather forming sheet, and the left fastening tape is attached to at least one left edge of the stretchable part and the gathering sheet. directly bonded Rutotomoni,
The right fastening tape is joined to a position overlapping the right and left edges of the stretchable part and the gathering sheet, and the right fastening tape is attached to at least one right edge of the stretchable part and the gathering sheet. Disposable diapers that are joined directly . The gather band is configured to be wider than the width of the one enveloping part in the trunk-circumferential direction, and extends to the left in the trunk-circumference direction from the left edge of the one encapsulating part. It is joined to the skin contact surface of the one encapsulating part so as to have a right extending part located on the right side of the trunk direction from the right edge of the one encapsulating part,
The left fastening tape is joined to the left extension of the gather band,
The disposable diaper according to claim 1 , wherein the right fastening tape is joined to the right extension of the gather band. The left reinforcing sheet is joined to the position overlapping the left edge of the gather band,
The left fastening tape overlaps with the left edge of the left reinforcing sheet, with the tip thereof directed toward the center of the waist and the surface with the fastening material directed toward the gather band. And joined to the position to
The right reinforcing sheet is joined at a position overlapping the right edge of the gather band,
The right fastening tape overlaps with the right edge of the left reinforcing sheet in a state where the front end is directed to the center side in the waistline direction and the surface to which the fastening material is attached is directed to the gather band side. The disposable diaper of Claim 1 or 2 joined to the position to do. While the joint between the left edge of the gather band and the left reinforcing sheet is formed at a position overlapping the joint between the left fastening tape and the left reinforcing sheet,
The disposable diaper of Claim 3 currently formed in the position where the junction part of the right edge part of the said gathering band and the said right reinforcement sheet overlaps with the junction part of the said right fastening tape and the said right reinforcement sheet. The gathered band is configured integrally with a stretchable nonwoven fabric in which stretchable stretch materials are disposed between layers of a plurality of nonwoven fabric sheets, and the gathered sheet,
A portion of the gather band that is joined to the one encapsulating part is joined to the one encapsulating part in a state of being contracted to 40 to 90% of the original size of the nonwoven fabric sheet. The disposable diaper as described in any one of Claims 1-4 .

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