JP2008006272A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an engagement force of a fastening tape to an outer face back sheet without largely changing the designs of the outer face back sheet and the fastening tape. <P>SOLUTION: This disposable diaper consists of an absorbent body 4, a liquid permeable top sheet 3 covering the surface side of the absorbent body 4, a leakage prevention sheet 6 covering the back face side of the absorbent body, the outer face back sheet 2 provided in the outer face side of the leakage prevention sheet 6 and formed of a nonwoven fabric, and the mechanical joining type fastening tape 10 having hook elements 10B provided in the back side both sides of the diaper; when wearing the diaper, the fastening tape 10 is directly engaged with the surface of the outer face back sheet 2; and multiple openings 12 penetrating through the outer face back sheet 2 are provided in the outer face side of the outer face back sheet 2 at least in the engagement range 11 set as the engagement area of the fastening tape 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tape-type disposable diaper that does not have a front target tape on the outer surface of the front body of the diaper, and more particularly to a tape-type disposable diaper having a mechanical engagement force with a fastening tape increased by a simple means.

  Conventionally, as shown in FIG. 17, for example, a commercially available tape-type paper diaper is provided with fastening tapes 50 and 50 for attaching diapers on both sides of the back body of the paper diaper. After applying the front and back bodies to the wearer's body, the fastening tapes 50 and 50 are brought to the ventral side and fixed to the surface of an impervious sheet such as a polyethylene sheet on the outer surface of the paper diaper with an adhesive. The paper diaper is fixed to a front target tape 51 (hereinafter referred to as FTT) made of a plastic material such as polyethylene, nonwoven fabric, tricot or the like.

  In such a tape-type paper diaper, it is difficult to attach a diaper firmly after one stop, and in many cases, the diaper is actually attached by several reattachments. For example, when one fastening tape 50 is fastened to the FTT 51 and the other fastening tape 50 does not reach the FTT, there is an annoyance that must be fastened and how many times the fastening is repeated. While doing so, the FTT sometimes broke.

  In order to cope with these problems, the fastening tape 50 is not an adhesive type, but a mechanical engagement type using a hook or the like, and a back sheet constituting an outer surface of the diaper is a non-woven fabric. Various disposable diapers that are directly engaged with the surface of the outer backsheet (nonwoven fabric) have been proposed.

  For example, in Patent Document 1 below, a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body interposed between both sheets, a fastening tape for fixing a diaper at the time of wearing, and the fastening tape In a disposable diaper having a release tape that folds the fastening tape by a folding portion when it is not needed and adheres the adhesive surface thereof, the back sheet has a load of 100 g when stretched in the width direction of the disposable diaper by 100%. / Cm to 300 g / cm, bulk softness is 55 g or less, and breaking strength is 250 g / cm or more. The fastening tape has a 180 ° peeling force against the back sheet (adhered to the back sheet, 40 The peel strength after 24 hours at 80 ° C. is 400 g / cm or less and under a load of 500 g. A disposable diaper characterized in that the holding time is 10 minutes or more and the back sheet does not have a reinforcing film for adhering the fastening tape is disclosed.

  Moreover, in the following patent document 2, it has a fastening piece attached to the back side both ends of a paper diaper, and has a hook element in the fastening surface of this fastening piece, and the outer sheet | seat which comprises the back surface of the said paper diaper is nonwoven fabric. When the paper diaper is mounted, the hook element of the fastening piece is a paper diaper that can be engaged with an arbitrary portion of the surface of the nonwoven fabric outer sheet, and is attached to at least one of the nonwoven fabric outer sheet and the sheet below the nonwoven fabric. A paper diaper is disclosed in which target printing, which is a measure of the position at which the hook element of the fastening piece is fastened, is made visible from the outside.

  Furthermore, in the following Patent Document 3, a liquid-permeable top sheet covering the front surface side, a liquid-impermeable back sheet covering the back surface side, an absorbent body interposed between the sheets, and the outside of the back sheet FTT-less type (not equipped with FTT) configured to form a front body and a back body by folding a diaper body comprising a diaper fastening fastening tape fixed to both sides of the back from the longitudinal center. In this disposable paper diaper, there is disclosed a disposable paper diaper in which a strip sheet on which target printing is displayed with the fastening position of the fastening tape displayed at the abdomen position of the front body is provided so that the printing is visible from the outside.

  On the other hand, the proposal which uses the nonwoven fabric itself as a surface fastener female material is also made. For example, in Patent Document 4 below, a large number of thermoplastic long fibers are accumulated, and the long fibers themselves are softened in a large number of heat fusion zones arranged at regular intervals between the long fibers. Alternatively, it is fixed by self-fusion by melting and satisfies a predetermined stretch strength at the same time, and a part of the long fiber is cut or a part of the heat-fusing area is broken by a needle punch, or A female material for a hook-and-loop fastener made of a stretchable nonwoven fabric excellent in flexibility, characterized in that a part of the long fiber protrudes in a loop shape on the surface is disclosed.

Moreover, in the following patent document 5, in the hook-and-loop female material in which the loop part which protrudes on the one surface side of a nonwoven fabric is formed, the loop formed by the needle punch method on one surface side of the hydroentangled web A hook-and-loop female member characterized by having a portion is disclosed.
JP-A-7-308343 JP 2002-253608 A JP 2003-153952 A JP 2000-160464 A JP-A-11-299508

  However, like the disposable diapers shown in Patent Documents 1 to 3, in the case of a structure in which the mechanical fastening tape is directly engaged with the nonwoven fabric constituting the outer backsheet, the mechanical fastening tape and the outer backsheet Engagement force could not be ensured sufficiently, and the mechanical fastening tape sometimes detached from the outer backsheet during mounting.

  On the other hand, if the hook-and-loop female material (nonwoven fabric) described in Patent Documents 4 and 5 is used as the outer backsheet, sufficient engagement force can be obtained. Since it is necessary to use a bulky non-woven fabric in order to form a protruding structure, there is a problem that the properties of the usable non-woven fabric are considerably limited.

  By the way, in disposable diapers using this type of hook-and-loop fastener, in order to respond to the movement of the wearer, the flap to which the fastening tape is bonded has elasticity, the fastening tape itself has elasticity, Or it is common to make a wearer easy to move by giving stretchability to the engaging portion forming region and giving stretchability around the abdomen. Further, even if the stretchability is not positively imparted in this way, the abdomen extends and contracts due to the elongation of the constituent sheet material accompanying the movement of the wearer.

  However, the conventional disposable diaper locking part has a structure in which the peel strength from the male material does not differ depending on the part, for example, when the fastening tape is pulled and locked to the center side to try to attach tightly In addition, the fastening force of the fastening tape acts strongly, and it becomes easy to release the lock. On the other hand, if you try to attach it loosely and lock it close to the side part, the fastening force of the fastening tape hardly acts and is unnecessary. It was locked by strength.

  And in this configuration, when trying to secure the necessary and sufficient locking state in the state where the abdomen is extended, the peeling strength between the female material sheet and the embossed area constituting the locking portion and the fastening tape is increased. Or, the fastening tape or side flaps can be easily stretched to loosen the stretching force around the abdomen, but in the aspect of increasing the peel strength, it is not easy to reattach the fastening tape, and the advantages of the hook-and-loop fastener are reduced, On the other hand, if the stretching force around the abdomen is weakened, the front and back bodies are likely to be misaligned, which causes a leak.

  Also, for example, depending on the shape of the abdomen due to the age of the wearer and the hyperactivity such as turning over, the front and back bodies may frequently shift, and at this time, the fastening tape is in the product length direction. Often it will be peeled off. Therefore, at this time, the width difference between the front and rear bodies is larger at the side edges in the width direction than at the center part in the width direction of the product, so that both side edges in the width direction are more difficult to peel off than the center part in the width direction of the product. desired.

  Accordingly, the first problem of the present invention is that a mechanically joined fastening tape is provided on both sides of the diaper on the back side, and when the diaper is mounted, the fastening tape is directly applied to the surface of the outer backsheet (nonwoven fabric) made of nonwoven fabric. An object of the present invention is to provide a disposable diaper in which the engaging force of the fastening tape with respect to the outer back sheet is improved without a major design change of the outer back sheet and the fastening tape.

  The second problem is to provide a disposable diaper that can always be in a locked state having a suitable strength regardless of the fastening position of the fastening tape with respect to the engagement region.

In order to solve the above-mentioned problem, the present invention according to claim 1 includes an absorber, a liquid-permeable top sheet that covers the surface side of the absorber, a leak-proof sheet that covers the back side of the absorber, It consists of an outer back sheet made of nonwoven fabric provided on the outer surface side of the leakage sheet, and a mechanically joined fastening tape having hook elements provided on both sides on the back side of the diaper, and the fastening tape is used for attaching the diaper. In the disposable diaper adapted to directly engage the surface of the outer back sheet,
A disposable diaper characterized in that a plurality of apertures penetrating the outer back sheet are provided at least in a predetermined range set as an engaging area of the fastening tape with respect to the outer surface side of the outer back sheet. Provided.

  According to the first aspect of the present invention, the fastening pieces (hook pieces, etc.) of the fastening tape are engaged with the numerous openings provided in the predetermined range, thereby engaging the fastening tape. it can. Thereby, even if it is a non-woven fabric with a low fabric weight, sufficient engagement force can be given and it can be used now as a nonwoven fabric outer surface backsheet of a paper diaper. The engaging force of the fastening tape can be adjusted by the formation ratio of the openings.

  As the present invention according to claim 2, there is provided the disposable diaper according to claim 1, wherein the opening is formed at a ratio of 5 to 20% within a predetermined range set as the engagement region.

  The present invention according to claim 2 defines the area ratio of the holes to be applied by the hole opening treatment from the viewpoint of securing an appropriate engagement force of the hook elements or maintaining the strength of the nonwoven fabric. Further, the engaging force of the fastening tape can be adjusted by a simple method that only adjusts the area ratio of the holes.

  As the present invention according to claim 3, the opening is formed by performing an opening process from the surface side which is the inner surface side of the diaper to the surface side which is the outer surface side of the diaper, and the edge of the opening stands on the outer side of the diaper. A disposable diaper according to any one of claims 1 and 2 is provided.

  As the present invention according to claim 3, the opening is formed from the surface side which is the inner surface side of the diaper toward the surface side which is the outer surface side of the diaper, and even if the opening edge is slight, the outer surface side. The hook element is easily hooked and the engaging force is easily generated.

  As the present invention according to claim 4, there is provided the disposable diaper according to any one of claims 1 to 3, wherein the opening is formed by introducing opening means on a production line.

  In the invention according to the fourth aspect, since the opening is formed by introducing opening means on the production line, it can be easily manufactured. Examples of the hole opening means include hole opening means such as a cutter, emboss, and air.

  According to a fifth aspect of the present invention, there is provided a hook-and-loop fastener comprising a plurality of engaging elements formed on a region corresponding to a predetermined range set as the engagement region on the inner surface side of the outer backsheet. A disposable diaper according to any one of claims 1 to 4 is provided.

  According to the fifth aspect of the present invention, by providing the female material sheet on the inner surface side of the outer back sheet, the female material sheet is exposed from the opening, and the engagement force with the fastening tape can be further improved.

  According to a sixth aspect of the present invention, the engagement region is provided so as to extend from the center in the width direction of the product toward the left and right side edges, and the engagement force with the hook element is the width direction of the product. The disposable diaper in any one of Claims 1-5 comprised so that it may become low in steps or continuously toward the left-right both-sides edge direction from a center is provided.

  The invention described in claim 6 is a first aspect configured in accordance with the use situation of the user who attaches / detaches the diaper and the wearer who wears the diaper. For example, this 1st aspect can be used conveniently as a diaper for newborn infants just after birth. Specifically, in a baby diaper, a newborn diaper used soon after birth may be designed so that the engagement force decreases from the center in the width direction of the product toward the left and right side edges. Originally, in a diaper for a newborn baby, a newborn baby who is a wearer hardly moves violently, so a high engagement force is not required. However, it may be necessary for a user unaccustomed to handling diapers to set the engagement force to be high in order to give a sense of security during use. Therefore, by configuring in the first aspect, the engagement force is set higher near the center in the width direction when used as a diaper for a newborn after birth, and the baby grows and engages. The engaging force is gradually lowered to an appropriate strength as the position moves in the width direction side edge direction and as the user gets used to handling the diaper. Thereby, according to the usage situation of the user and wearer of a diaper, the locked state of suitable strength can always be implement | achieved regardless of the fastening position with respect to the engaging area of a fastening tape.

  As an aspect of the present invention according to claim 7, the engaging region is provided so as to extend from the center in the width direction of the product toward both left and right edges, and the engaging force with the hook element is in the width direction of the product. The disposable diaper in any one of Claims 1-5 comprised so that it may become high in steps or continuously toward the left-right both-sides edge direction from a center is provided.

  The invention described in claim 7 is a second aspect configured in accordance with the use situation of the user and the wearer. The diaper according to the present embodiment is intended for 1 to 2 years old or older children who are used to handling diapers among baby diapers and in which the movement of a baby as a wearer is active. Since such a diaper may be used up to the limit of the adaptive size, it has been desired to set the engagement force to increase particularly as it moves from the center in the width direction to the side edge. By setting the engagement force strongly at the side edge of the engagement area in this way, it is possible to prevent the fastening tape from being pulled in the direction of the left and right edges by the movement of the baby and unintentionally released from the fastened state. it can. Furthermore, according to the use situation of the user and wearer of the diaper, it is possible to always realize a locked state having a suitable strength regardless of the fastening position with respect to the engagement region of the fastening tape.

  As the present invention according to claim 8, the engaging region is provided so as to extend from the center in the width direction of the product toward both left and right edges, and the engaging force with the hook element is in the vertical direction of the product. The disposable diaper according to any one of claims 1 to 5, wherein the disposable diaper is configured to be maximized on the upper side and lowered stepwise or continuously toward the lower side.

  The invention according to claim 8 is a third aspect configured in accordance with the use situation of the user and the wearer. The diaper according to this aspect is intended for an infant or the like whose upper part of the abdomen (around the umbilicus) protrudes greatly. Specifically, the engagement force of the engagement region is maximized on the upper side in the vertical direction, so that the engagement is firmly performed in the vicinity of the waist opening edge where the engagement state is most easily released by the abdominal pressure. . On the other hand, the lower abdomen is prevented from being tightened unnecessarily firmly by configuring the engaging force to be lowered stepwise or continuously toward the lower side in the vertical direction of the engaging region. Thereby, according to the usage situation of the user and wearer of a diaper, the locked state of suitable strength can always be implement | achieved regardless of the fastening position with respect to the engaging area of a fastening tape.

  As the present invention according to claim 9, the engaging region is provided so as to extend from the center in the width direction of the product toward both left and right edges, and the engaging force with the hook element is in the vertical direction of the product. The disposable diaper according to any one of claims 1 to 5, wherein the disposable diaper is configured to be maximized on the lower side and lowered stepwise or continuously toward the upper side.

  The invention according to claim 9 is a third aspect configured in accordance with the use situation of the user and the wearer. The diaper according to this embodiment is intended for an adult with a large lower abdomen overhang. The diaper according to this aspect is maximal in the lower side in the vertical direction of the engagement region, contrary to the invention described in claim 8 above. And is designed to be locked. On the other hand, since the engaging force is set to be low stepwise or continuously toward the upper side in the longitudinal direction of the engaging region, it is not unnecessarily firmly tightened in the vicinity of the waistline opening edge. Thereby, according to the usage situation of the user and wearer of a diaper, the locked state of suitable strength can always be implement | achieved regardless of the fastening position with respect to the engaging area of a fastening tape.

  As described above in detail, according to the present invention, it is possible to improve the engaging force of the fastening tape with respect to the outer back sheet without requiring a major design change of the outer back sheet and the fastening tape. In addition, it is possible to always achieve a locked state having a suitable strength regardless of the fastening position of the fastening tape with respect to the engagement region.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially broken development view of a disposable paper diaper according to the present invention, and FIG. 2 is a transverse sectional view.
[Structure of disposable diaper 1]
1 and 2, the disposable diaper 1 is made of cotton-like pulp or the like, has a certain degree of rigidity such as an hourglass shape (or rectangular shape), and is surrounded by the crepe paper 5 and the absorption. A liquid-permeable top sheet 3 made of a perforated or non-porous nonwoven fabric or a perforated plastic sheet disposed so as to cover the surface side (use surface side) of the body 4, and disposed on the back side of the absorbent body And a leak-proof sheet 6 made of polyethylene or the like disposed so as to cover at least the entire area of the absorbent body 4 and a non-woven fabric provided on the outer surface side (non-skin contact surface side) of the leak-proof sheet 6. In addition, an outer back sheet 2 that defines the outer shape of the diaper, and a three-dimensional gather BS that stands on the surface side are formed on both sides of the paper diaper, and the leakage preventing sheet 6 and the back sheet 2 are formed on both sides of the diaper. The side nonwoven fabric 7, 7 for composing the side-flap portions SF together, is mainly composed of mechanical joining type fastening tapes 10, 10 Metropolitan provided on the diaper dorsal sides. Further, at the abdomen waist portion and the back waist portion of the paper diaper, the outer back sheet 2, the leak-proof sheet 6 and the liquid-permeable top sheet 3 extend together, and an end flap portion EF where the absorbent body 4 does not exist is formed. ing.

  In attaching, as shown in FIG. 3, the front and back bodies of the disposable diaper 1 are respectively applied to the wearer's body, and then the fastening tapes 10 and 10 are brought to the ventral side, A paper diaper is mounted in direct engagement with the surface.

In the following, each configuration will be specifically described in detail.
The absorbent body 4 is made of, for example, fluffy pulp and a water-absorbing polymer. In the illustrated example, the absorbent body 4 has a substantially hourglass shape having constricted portions on both sides in order to reduce the contact with the legs. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. When the absorbent body 4 is surrounded by the crepe paper 5 as in the illustrated example, the crepe paper is interposed between the liquid-permeable surface sheet 3 and the absorbent body 4 as a result, and the absorbency is excellent. The crepe paper 5 quickly diffuses body fluid and prevents reversal of these menstrual blood and the like.

  As the liquid-permeable top sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, an air through method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.

  The leak-proof sheet 6 is made of a sheet material having at least a water shielding property such as an olefin resin sheet such as polyethylene or polypropylene, and is installed in a range covering at least the entire area of the absorber 4 in order to prevent leakage. In recent years, those having moisture permeability are preferably used from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. In addition, if importance is attached to absorbability of body fluids, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the production process of synthetic fibers, or a metal such as stannic chloride Use a non-woven fabric that has been treated with salt to make the synthetic fiber swelled or porous, such as by partially dissolving the surface to make it porous and depositing metal hydroxide, and applying hydrophilicity by applying capillary action. It is desirable to make it.

  The liquid-permeable top sheet 3 protrudes slightly outward from the side edge of the absorber 4 and is joined to the leak-proof sheet 6. The side nonwoven fabric 7 has an outer portion extending to the outer edge rather than the vicinity of the side edge portion of the absorbent body 4 and is joined to the leakage preventing sheet 6 and the outer back sheet 2, and the laminated sheet portion constitutes a side flap SF. Yes.

  In the side flap portion SF, a plurality of elastic elastic members 8 and 8 in the illustrated example are arranged in the longitudinal direction of the paper diaper, and a planar gather is formed. The flat gathers hold the paper diaper tightly around the legs when worn, thereby improving fit and preventing the paper diaper from shifting.

  On the other hand, a three-dimensional gather BS standing on the surface side is formed by the nonwoven fabric sheet portion on the inner side of the fixed portion of the side nonwoven fabric 7. The three-dimensional gather BS has a standing end near the side edge of the absorbent body 4, and the tip thereof is double-folded along the longitudinal direction of the paper diaper. One elastic elastic member 9 is formed inward of the folded portion. If necessary, a plurality of elastic elastic members are provided, and the three-dimensional gather BS is erected using the elastic force.

  As the elastic elastic members 8 and 9, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester and the like that are usually used can be used. .

  The material fibers constituting the side nonwoven fabric 7 can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, recycled fibers such as rayon or cupra, and natural fibers such as cotton. The nonwoven fabric obtained by an appropriate processing method such as a spunbond method, an air-through method, a melt blown method, a needle punch method can be used. In particular, the side nonwoven fabric 7 constituting the side flap portion SF has a feeling of wrinkles. In order to eliminate it and to prevent stuffiness, it is preferable to use a non-woven fabric that suppresses the basis weight and has excellent air permeability.

  The mechanical joining type fastening tape 10 has a base of a fastening base material 10A such as plastic, polylaminated nonwoven fabric, nonwoven fabric, paper, etc. joined to a diaper. A hook element 10B is provided on the protruding piece portion of the fastening substrate 10A and on the surface side (surface on the liquid-permeable top sheet 3 side). The hook element 10B is bonded to the fastening base material 10A with an adhesive so as not to be peeled off. The hook element 10B has a large number of engaging pieces 10b, 10b,. As shown in FIG. 4, the shape of the engaging piece 10b is, for example, (A) letter shape, (B) J shape, (C) mushroom shape, (D) T shape, (E) double J Although there exist things, such as a letter shape (the shape which combined the J-shaped thing back to back), any shape may be sufficient. A shape that is easily entangled with fibers of the opening 12 or the outer back sheet 2 described later, for example, a letter shape, a J shape, a T shape, or a double J shape is preferable. In the product state, the fastening tape 10 is folded to the liquid-permeable top sheet 3 side, and the hook element 10B is detachably bonded to the side nonwoven fabric 7.

  Examples of the material fibers constituting the nonwoven fabric of the outer backsheet 2 include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, an air-through method, or a needle punch method can be used. In general, when mechanical engagement with the fastening tape is intended, it is necessary to use a non-woven fabric having appropriate engagement force by raising, but in the disposable diaper 1 according to the present invention, this engagement force is arbitrary. can do.

[Structure of engagement range 11]
The outer surface backsheet 2 made of the aforementioned non-woven fabric is subjected to a hole opening process on a predetermined range 11 (hereinafter referred to as an engagement range) assumed as an engagement region of at least the fastening tape 10 on the outer surface side. The engagement force with the hook element 10B is increased. The engagement range 11 can be set arbitrarily, but it is desirable to set it sufficiently wide in consideration of the body type difference.

  As shown in FIGS. 5 and 6, a large number of apertures 12, 12... Are provided in the engagement range 11 by performing an aperture treatment that penetrates the outer backsheet 2. As shown in FIGS. 5 (A) to (C), the planar shape of the opening 12 is a slit-like linear opening that is long in the diaper longitudinal direction or long in the diaper width direction, or circular, elliptical, or It can be a rounded hole shape such as a jade ball shape. Further, the arrangement may be regular or irregular, and is arbitrary over the engagement range 11. Further, the cross-sectional shape of the opening 12 is formed such that the edge of the opening 12 is flat with respect to the surface of the diaper as shown in FIGS. 6 and 7A. As shown in (B), it can be formed so as to stand outside the diaper, or can be formed (not shown) so as to stand inside the diaper. Among these, those that can further increase the engagement force of the fastening tape 10 with the engagement piece 10b are formed with the edge of the opening 12 standing outside the diaper, as shown in FIG. 7B. It is an aspect.

  In order to lock the fastening tape 10 in the engagement range 11 subjected to such an opening process, as shown in FIG. 7, the fastening tape 10 is brought into the wearer's stomach side and pulled, The hook element 10 </ b> B is engaged with the engagement range 11. As a result, the engagement piece 10 b enters the opening 12, a tensile force in the wearer's abdomen direction (arrow direction in FIG. 7) is applied, and the engagement piece 10 b is locked to the opening 12. As a result, the engagement force of the fastening tape 10 can be increased. In addition, the engaging piece 10b which does not penetrate | invade in the opening 12 is applied with the engaging force by engaging with the nonwoven fabric fiber which protruded from the surface of the outer surface backsheet 2. FIG.

  As described above, in the diaper according to the present invention, the engagement piece 10b enters the opening 12 to increase the engagement force. Therefore, as the outer backsheet 2, the engagement piece 10b and the outer backsheet are used. It is possible to use any engagement force with the nonwoven fabric fiber protruding from the surface of 2. In particular, when the outer back sheet 2 is applied to a material in which it is difficult to obtain an engaging force between the engaging piece 10b and the nonwoven fiber protruding from the surface of the outer back sheet 2, such as SMS or a spunbonded nonwoven fabric. The effect of increasing the engagement force according to the present invention is remarkably exhibited. Moreover, since these nonwoven fabrics are excellent in strength characteristics by using SMS or a spunbond nonwoven fabric as the outer back sheet 2, a diaper that maintains a sufficient strength even if the engagement range 11 is subjected to a hole opening treatment. can do.

  From the viewpoint of securing an appropriate engaging force of the hook element 10B or maintaining the strength of the nonwoven fabric, the opening ratio of the opening 12 is within a predetermined range set as the engaging range 11, and is an area ratio of 5 to 20%. It is desirable to form with. When the opening ratio is less than 5%, the engagement pieces 10b entering the opening 12 are reduced and a sufficient engagement force cannot be obtained. When the opening ratio exceeds 20%, the strength of the nonwoven fabric itself is weak. The joint may be broken.

  Further, when the aperture 12 is formed in the slit shape shown in FIGS. 5A and 5B, the slit width is 0.5 mm or less, preferably 0.2 to 0.5 mm, and the slit center interval Is preferably 5 to 15 mm and 7 to 10 mm.

  On the other hand, when the opening 12 is formed by a circular hole or the like shown in FIG. 5C, the diameter (maximum diameter) of one circle is 0.5 to 4 mm, preferably 1.0 to 3 mm. The center distance is 5 to 15 mm, preferably 7 to 10 mm. In addition, when forming in oval shape other than a circle | round | yen, or a ball shape, it is desirable for one shape to be the magnitude | size which fits in the dimension of 3 mm x 3 mm.

  The disposable diaper 1 according to the present invention has an advantage that the engagement force of the fastening tape 10 can be easily adjusted by adjusting the formation ratio of the openings 12.

  By the way, a female material sheet 16 of a hook-and-loop fastener having a locking portion in which a large number of female elements are formed at least in a region corresponding to the engagement range 11 is provided on the inner surface side of the outer backsheet 2, and The female element can be exposed from the holes 12, 12.

  The female material sheet 16 of the hook-and-loop fastener is composed of a sheet-like material including female elements suitable for locking with the hook elements 10B provided on the fastening tapes 10 and 10, and various known female material sheets in the conventional example. Can be used after appropriate processing. The female material sheet 16 is made of, for example, a web made of natural fibers such as a woven fabric, synthetic fibers, regenerated fibers, cotton, etc., in which a large number of loop-shaped or arch-shaped female elements are formed on one side, and the spunlace method or the like. A non-woven fabric in which a number of loop-shaped and arch-shaped female elements are remarkably formed on one side by applying the above processing method, or a non-woven fabric formed by sticking this to a base sheet can be used. Here, in order to achieve a stepwise or continuous difference in peel strength for each section of the engagement range 11 to be described later, for example, a female material sheet having a different density of female elements for each section may be used. it can. It can also be achieved by appropriately crushing the female element by embossing one female sheet for each section.

  Next, the opening process for the engagement range 11 will be described in detail. In order to perform a hole opening process on the non-woven fabric constituting the outer back sheet 2, as shown in FIG. 8, in the production line, the processing equipment 13 in which the cutter roll 14 and the anvil roll 15 are arranged to face each other. This can be done by passing a non-woven web (outer backsheet web) between the rolls 14 and 15. Convex cutters 14a, 14a are arranged on the surface of the cutter roll 14 at a predetermined interval in the circumferential direction, and the outer back sheet 2 is rotated at a speed equivalent to the line speed of the web (outer back sheet 2). Open holes 12, 12... Are formed in the engagement range 11 (FIG. 9). In the opening process, it is desirable to introduce a cutter from a surface side that is the inner surface side of the diaper to a surface side that is the outer surface side of the diaper. As a result, as shown in FIG. 7B, the edge of the opening 12 can be provided so as to stand on the outer side of the diaper, and the engagement piece 10b can be easily caught and engagement force is generated. It becomes easy.

  The outer back sheet 2 that has been subjected to the hole opening treatment as described above is bonded to the inner surface side (skin contact surface side) of the leak-proof sheet 6 coated with an adhesive, and then to the next assembly step. Sent.

  Here, when the leak-proof sheet 6 and the outer back sheet 2 are bonded, at least in the engagement range 11, the adhesive application range (the adhesive area between the leak-proof sheet 6 and the outer back sheet 2) is the leak-proof function. It is preferable that the bonding area of the sheet 6 and the outer back sheet 2 is 5 to 90%, preferably 20 to 80%. When the application range of the adhesive exceeds 90% of the bonding area, the edges of the openings 12, 12,... Are also bonded to the leak-proof sheet 6, and the engagement pieces 10b cannot be engaged. Moreover, when the application range of the adhesive is less than 5% of the bonding area, the outer back sheet 2 may be peeled from the leak-proof sheet 6 when the fastening tape 10 is peeled off.

  The adhesive strength between the leakproof sheet 6 and the outer back sheet 2 is preferably 250 gf / 25 mm or more. If it is less than 250 gf / 25 mm, when the fastening tape 10 is peeled off, the outer back sheet 2 may peel off from the leak-proof sheet 6.

  Such an adhesion mode and condition between the outer back sheet 2 and the lower sheet can be similarly applied to the case where the female sheet is provided as the lower sheet.

  In the disposable diaper 1 according to the present invention, as shown in FIG. 10 (A), the engagement range 11 is between the engagement piece 10b of the fastening tape 10 from the center in the width direction of the product toward the left and right side edges. The engagement force is changed stepwise, or the engagement force with the engagement piece 10b of the fastening tape 10 is stepwise from one side to the other side of the product as shown in FIG. 10B. Can be changed. Specifically, as a first aspect, the engagement force of the fastening tape 10 with the engagement piece 10b can be reduced stepwise from the center of the diaper in the width direction toward the left and right side edges. Moreover, as a 2nd aspect, it can be set as the structure which becomes high stepwise from the width direction center of a product toward the right-and-left both-sides edge direction with the engaging piece 10b. As a third aspect, the engagement force with the engagement piece 10b can be maximized on the upper side in the longitudinal direction of the product and can be lowered stepwise or continuously toward the lower side. Furthermore, as a fourth aspect, the engagement force with the engagement piece 10b can be maximized on the lower side in the longitudinal direction of the product and can be lowered stepwise or continuously toward the upper side.

  FIG. 10 (A) shows the engagement range 11 according to the first and second aspects. The engagement range 11 includes a section D1 located in the center and sections D2 adjacent to both sides thereof. It is divided into five sections, D2 and further sections D3 and D3 adjacent to both sides thereof. The engagement force of each section will be described by taking the engagement range 11 according to the first aspect as an example. As shown in FIG. 11, the section D1 located at the center has the highest engagement force and is adjacent to the section D2. Further, the engagement force is configured to decrease in the order of the section D3 adjacent to the section D2. On the other hand, FIG. 10 (B) shows the engagement range 11 according to the third and fourth aspects, and the engagement range 11 is divided into sections D4 to D6 from the upper side in the longitudinal direction of the product. Yes.

  Although the specific engagement force of each section can be determined as appropriate, it is generally desirable that the peel strength is divided into stages with a difference in the range of 100 gf to 1500 gf, preferably 140 to 400 gf. When the peel strength is less than 100 gf, sufficient locking cannot be obtained, and when it exceeds 1500 kgf, the locking force is too strong, and fluffing in the engagement range 11 is likely to occur when peeling off.

  In addition, the measuring method of this peeling strength is measured as follows. First, a cloth tape having a width of 50 mm × a length of 100 mm is folded in the width direction to form a two-fold cloth tape having a width of 25 mm × 100 mm, and the fastening tape is firmly attached to one end of the cloth tape. At this time, the hook element of the fastening tape is positioned outside the tip of the cloth tape.

  On the other hand, a female material sheet according to the present invention is attached to a stainless steel flat plate with a double-sided adhesive tape with the female element forming surface as the upper surface. Furthermore, both ends are fixed with craft tape.

  Next, after the hook element of the fastening tape and the female element forming surface are brought into contact with each other, the fastening tape and the female material sheet are pressure-bonded by reciprocating from the cloth tape side with a roller having a mass of 2 kg. Further, a 1 kg weight is suspended from the other end of the fabric tape opposite to the fastening tape for 10 seconds to apply a shearing force to the crimped portion to ensure the locking.

  Thereafter, the stainless steel flat plate and the other end of the cloth tape opposite to the fastening tape are chucked with a jig of a tensile tester. At this time, the tensile direction of the jig for chucking the other end of the cloth tape on the opposite side to the fastening tape of the cloth tape is set to 90 °.

  Thus, after setting the jig on the tensile tester so that the final peel angle is 90 °, the crimped part is peeled off at 300 mm / min, and the uneven weight average value measured at that time is defined as the peel strength. The measured value is an average of 3 to 10 effective measured values. In addition, in the measurement, the sample is set so that the measurement is in the CD-to-CD direction. Further, the size of the test piece is such that the fastening tape is 47 mm ± 3 mm (MD direction) × 93 mm (CD direction), and the female base sheet 23.5 ± 1.5 mm (MD direction) × 24 mm (CD direction). To do. Here, the MD direction is the product longitudinal direction, and the CD direction is the product width direction.

  In addition, a tensile tester (AOUTGRAPH AGS-G100N made by SHIMADZU) can be used for the peel strength test.

  On the other hand, the number of sections of the locking portion is not limited to the five sections in the illustrated example, and may be three sections or five sections or more. However, if the peel strength is to be lowered step by step, it is desirable that the section has a size that accommodates the hook elements formed on the fastening tape.

  Note that, in this embodiment, the peel strengths of the sections located in line symmetry with respect to the center line in the product width direction are configured to be the same, but they are not necessarily the same.

  Further, as shown in the relationship between the engagement force and the position of the locking portion shown in FIG. 12, for example, the peel strength continuously decreases from the central portion in the product width direction toward both side edges without providing a partition. It may be configured.

  Moreover, it is desirable that the engagement range 11 is designed so that the shearing force with the fastening tape is 1 kg to 10 kg, preferably 3 to 8 kg, regardless of the section. If it is less than 1 kg, the lock is easily released, and if it exceeds 10 kg, the lock is too strong.

  In addition, the measuring method of this shear force is measured as follows. First, a female material sheet according to the present invention is affixed to a stainless steel flat plate with a double-sided adhesive tape with the female element forming surface as an upper surface. Furthermore, both ends are fixed with craft tape. At this time, a blank of a flat plate made of stainless steel is left around the female base sheet.

  Next, after the hook elements of the fastening tape are brought into contact with the female element forming surface, the fastening tape and the female base sheet are pressed against each other by reciprocating from the cloth tape side with a roller having a mass of 2 kg.

  Thereafter, the blank portion of the stainless steel flat plate and one end of the fastening tape are chucked with a jig of a tensile tester. At this time, the distance between chucks is set to 50 mm. Thus, when the chucking is completed, the jig is pulled in the shearing direction between the fastening tape and the female base sheet at a tensile speed of 30 mm / min, and the maximum shearing force is measured. The measured value is an average of 3 to 10 effective measured values. In addition, in the measurement, the sample is set so that the measurement is in the CD-to-CD direction. Further, the size of the test piece is such that the fastening tape is 47 mm ± 3 mm (MD direction) × 93 mm (CD direction), and the female base sheet 23.5 ± 1.5 mm (MD direction) × 24 mm (CD direction). To do. Here, the MD direction is the product longitudinal direction, and the CD direction is the product width direction.

  Next, a mode in which the engagement force between the engagement range 11 and the fastening tape 10 is changed stepwise will be described in detail with reference to FIGS. In FIG. 13, when the areas of the sections D1 to D3 of the engagement range 11 are formed to be equal, the openings 12 having the same size are formed in each section, but the number of openings to be formed is defined as the section D1. This is a configuration pattern when the number is the smallest and then increased sequentially with the sections D2 and D3. Further, FIG. 14 shows that when the areas of the sections D1 to D3 of the engagement range 11 are formed to be equal, the same number of openings 12 are formed in each section, but the size of the openings 12 is the section D1. This is a configuration pattern in the case of making it the smallest and then sequentially increasing the sections D2 and D3. FIG. 15 shows that when the areas of the sections D1 to D3 of the engagement range 11 are formed to be equal, the total area of the opening portions formed in each section is the same, but the total length of the opening edges is the same. Is the configuration pattern in the case where the size is the largest in the section D1, and then is sequentially reduced in the sections D2 and D3.

  In this case, when the female material sheet 16 does not intervene, or when the engaging force of the female material sheet 16 is weaker than the engaging force of the outer back sheet 2, the opening portion of the section is smaller than the area of the section. By reducing the ratio of the total area, the engaging force of the section becomes stronger, and conversely, by increasing the ratio of the total area of the apertures to the area of the section, the engaging force of the section becomes weaker. . Therefore, in the engagement range 11 of the configuration pattern shown in FIG. 13, since the size of the opening 12 formed in each section is the same, the engagement force is maximized in the section D1 having the smallest number of openings, and the opening is opened. As the number of holes is increased, the engaging force becomes weaker in the order of the sections D2 and D3. Further, in the engagement range 11 of the configuration pattern shown in FIG. 14, since the number of openings formed in each section is the same, the engagement force is maximized in the section D1 where the size of the opening is the smallest. As the size increases, the engagement force decreases in the order of the sections D2 and D3. On the other hand, in the engagement range 11 of the configuration pattern shown in FIG. 15, since the total area of the apertures formed in each section is the same, the engagement force with which the engagement piece 10b engages with the flat section of each section There will be no difference. However, the engagement force due to the engagement piece 10b engaging with the opening edge becomes the maximum in the section D1 having the largest total length of the opening edges, and as the total length of the opening edges is decreased, the section is increased. It becomes weaker in the order of D2 and D3.

  Further, in the case where the engagement force of the female material sheet 16 is stronger than the engagement force of the outer back sheet 2, the ratio of the total area of the apertures to the area of the section is increased to increase the ratio of the section. On the contrary, by reducing the ratio of the total area of the apertures to the area of the section, the engaging force of the section becomes weaker. Therefore, in the engagement range 11 of the configuration pattern shown in FIGS. 13 and 14, the engagement force is minimized in the section D1 where the total area of the opening portions is the smallest, and the engagement force increases in the order of the sections D2 and D3. On the other hand, in the engagement range 11 of the configuration pattern shown in FIG. 15, the engagement force due to the engagement with the opening edge of the engagement piece 10b is the same in the section D1 where the total length of the opening edges is the largest. It becomes the maximum and becomes weaker in the order of the sections D2 and D3 as the total length of the opening edges is reduced.

  In addition, when the engagement force of the female material sheet 16 and the engagement force of the outer back sheet 2 are not equal or large, it depends on the engagement force due to the engagement between the engagement piece 10b and the opening edge. Therefore, the engagement force becomes stronger by increasing the total length of the opening edges. Therefore, in the engagement range 11 of the configuration pattern shown in FIG. 13, the engagement force is minimized in the section D1 having the smallest number of openings, and the engagement force increases in the order of the sections D2 and D3 as the number of openings increases. Become. Further, in the engagement range 11 of the configuration pattern shown in FIG. 14, the engagement force becomes the smallest in the section D1 where the size of the opening is the smallest, and in accordance with the increase in the size of the opening, the sections D2 and D3 are arranged in this order. Engagement force increases. Further, in the engaging range 11 of the configuration pattern shown in FIG. 15, the engaging force becomes maximum in the section D1 having the largest total length of the opening edges, and the engaging force becomes weaker in the order of the sections D2 and D3.

  In the above-described configuration, as shown in FIG. 10 (B), the engagement force changes stepwise from one side in the longitudinal direction of the product, specifically, the relationship with the hook element. A configuration in which the resultant force is maximized on the upper side in the longitudinal direction (D4) of the product and gradually decreases toward the lower side, or the engaging force with the hook element is on the lower side in the longitudinal direction of the product The present invention can be similarly applied to any of the configurations configured to be maximum in (D6) and to be lowered stepwise or continuously toward the upper side.

  By the way, the female material sheet 16 can be a printed or colored sheet. By using a printed or colored sheet as the female material sheet 16, various designs can be applied to the diaper, and the design can be improved. Further, the printing or coloring applied to the female material sheet 16 can also serve as a target printing functioning as a mark when the fastening tape 10 is fastened. Thereby, it is not necessary to make the leak-proof sheet 6 a printed or colored sheet, and the material cost can be suppressed. Further, printing or coloring applied to the female material sheet 16 is effective in terms of facilitating the visual recognition of the engagement range 11 and the opening 12. In addition, the said printing or coloring can also be made the same in all the divisions, and can also be made a different coloring for every division.

  As shown in FIG. 16, in the engagement range 11, a portion D <b> 0 where the opening 12 does not exist in the boundary portion of each section is provided in order to facilitate the visual recognition of the engagement range 11 or the distinction between the sections D <b> 1 to D <b> 3. , D0... Can be provided. Thereby, it is not necessary to provide target printing in the engagement range 11.

  In addition, a white sheet with high opacity may be used as the outer back sheet 2, and the entire female material sheet 16 or leak-proof sheet 6 may be printed or colored. Thus, the engagement region can be clearly recognized by comparing the white color of the outer back sheet 2 with the printing or coloring of the female material sheet 16 or the leak-proof sheet 6 viewed from the opening 12. The opacity of the outer back sheet 2 is 40% or more, preferably 45% or more, more preferably 50% or more, as measured by JIS P8138.

  On the other hand, a sheet with low opacity may be used as the outer back sheet 2, and printing or coloring may be performed on a region corresponding to the engagement range 11 of the female material sheet 16 or the leak-proof sheet 6. Through the outer back sheet 2, printing or coloring becomes easy to visually recognize, and the engagement range 11 can be clearly recognized. The opacity of the outer back sheet 2 is 50% or less, preferably 45% or less, more preferably 40% or less, as measured by JIS P8138.

Repeat the operation of fixing a fastening substrate having a mushroom-like engagement piece having a height of 285 μm and a head diameter of 420 μm on a sheet made of a spunbonded nonwoven fabric having a basis weight of 20 g / m ² , A comparative experiment of the fifth peel strength after the peel was repeated four times was performed. Table 1 shows that the hole 12 made of a circular hole having a diameter of 0.5 mm is formed at a ratio of 3% with respect to the engagement range 11 with the edge of the hole 12 facing toward the outer surface of the diaper. In the case of applying (Example 1), the case of applying a hole processing at a rate of 5% (Example 2), the case of applying the hole processing of a rate of 10% (Example 3), When the opening 12 made of a 5 mm circular hole is formed at a ratio of 10% with respect to the engagement range 11 with the edge of the opening 12 facing toward the surface that is the inner surface of the diaper (Example 4) ), And the results for the case where the opening process is not performed (Comparative Example 1). Table 2 shows that the opening 12 made of a vertical slit having a width of 1 mm was made at a ratio of 3% with respect to the engagement range 11 with the edge of the opening 12 facing toward the outer diaper surface side. In the case (Example 6), when the hole was drilled at a rate of 5% (Example 7), when the hole was drilled at a rate of 10% (Example 8), a vertical slit having a width of 1 mm In the case where the opening 12 is made at a ratio of 10% with respect to the engagement range 11 and the edge of the opening 12 is directed toward the surface that is the inner surface of the diaper (Example 9), the width is 1 mm. (Example 10) In the case where the opening 12 made of the vertical slits is formed with the edge of the opening 12 facing the outer surface side of the diaper at a ratio of 20% with respect to the engagement range 11 This is also the result for the case (Example 11) where the hole-opening was performed at a rate of 23%. In Tables 1 and 2, ◎: strong engaging force, ◯: slightly strong engaging force, Δ: medium engaging force, x: small engaging force. Each evaluation (double-circle)-(triangle | delta) is evaluation when the comparative example 1 (x) is made into a reference | standard.

  As shown in Tables 1 and 2, it was proved that the engagement force can be improved by performing the opening process as compared with the case where the opening process is not performed (Comparative Example 1). Note that the fifth peel strengths of Example 5 and Example 11 are low in peel strength due to insufficient material strength of the outer back sheet 2 because of the high hole area ratio. In an actual diaper, it is difficult to repeat the fastening operation five times or more in a normal use case, so there seems to be no problem.

[Other examples]
(1) In the above embodiment, the cutter roll was used as the opening means, but the opening may be formed by an embossing roll, or the sheet is placed on the upper surface of the support having a large number of openings. In this state, it is also possible to employ a method of suctioning from below the support or forming a hole by pressurizing with air pressure from the upper surface of the support.
(2) The shape of the opening 12 can be various shapes such as an elliptical shape, a triangular shape, a quadrangular shape, a rhombus, and other polygonal shapes other than those described in the above embodiment. .

It is a partial fracture development view of disposable diaper 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is a wearing state figure of disposable diaper 1. It is sectional drawing of the hook element 10B part which shows the shape of the engagement piece 10b. (A)-(C) are the enlarged views of the engagement range 11 part which shows the example of a pattern shape of the opening 12 provided in the engagement range 11. FIG. It is VI-VI sectional drawing of FIG. 4 (A)-(C). It is explanatory drawing which shows the engagement state to the opening 12 of the engagement piece 10b. It is a figure which shows the hole opening process point. It is a formation point figure of the engagement range 11 with respect to the web (outer surface backsheet 2) in a production line. (A), (B) is the principal part enlarged view of the disposable diaper 1 which shows the engagement range 11 which concerns on this invention. It is a figure for demonstrating the stepwise difference of engagement force. It is a figure for demonstrating the case where engagement force changes continuously. It is a schematic diagram which shows the structure pattern (the 1) of the opening 12 given to the engagement range 11. FIG. It is a schematic diagram which shows the structure pattern (the 2) of the opening 12 given to the engagement range 11. FIG. It is a schematic diagram which shows the structure pattern (the 3) of the opening 12 given to the engagement range 11. FIG. It is a schematic diagram which shows the structure pattern (the 4) of the opening 12 given to the engagement range 11. FIG. It is a perspective view of the conventional disposable paper diaper.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 2 ... Outer surface back sheet, 3 ... Liquid-permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Leak-proof sheet, 7 ... Side nonwoven fabric, 8.9 ... Elastic elastic member, 10 ... Fastening tape, 11 ... engagement range, 12 ... opening, 16 ... female material sheet

Claims (9)

An absorbent body, a liquid-permeable top sheet that covers the surface side of the absorbent body, a leak-proof sheet that covers the back side of the absorbent body, and an outer back sheet made of a non-woven fabric provided on the outer surface side of the leak-proof sheet; The fastening tape comprises a mechanically joined fastening tape having hook elements provided on both sides of the back side of the diaper, and the fastening tape is directly engaged with the surface of the outer back sheet when the diaper is mounted. In disposable diapers,
A disposable diaper characterized in that a large number of apertures penetrating the outer back sheet are provided at least in a predetermined range set as an engaging area of the fastening tape with respect to the outer surface side of the outer back sheet.   The disposable diaper according to claim 1, wherein the opening is formed at a rate of 5 to 20% within a predetermined range set as the engagement region.   The said opening is formed by performing the opening process toward the surface side which becomes a diaper outer surface side from the surface side used as a diaper inner surface side, and the opening edge stands up on the diaper outer side. The disposable diaper described in Crab.   The disposable diaper according to any one of claims 1 to 3, wherein the opening is formed by introducing opening means on a production line.   The female material sheet of the hook-and-loop fastener which has the latching | locking part in which many female type elements were formed in the area | region corresponding to the predetermined range set as said engagement area | region at least is provided in the inner surface side of the said outer surface back seat | sheet. The disposable diaper in any one of -4.   The engagement region is provided so as to extend from the center in the width direction of the product toward the left and right side edges, and the engagement force with the hook element is directed from the center in the width direction of the product toward the left and right side edges. The disposable diaper in any one of Claims 1-5 comprised so that it may become low in steps or continuously.   The engagement region is provided so as to extend from the center in the width direction of the product toward the left and right side edges, and the engagement force with the hook element is directed from the center in the width direction of the product toward the left and right side edges. The disposable diaper in any one of Claims 1-5 comprised so that it may become high stepwise or continuously.   The engagement region is provided so as to extend from the center in the width direction of the product toward the left and right side edges, and the engagement force with the hook element is maximized on the upper side in the longitudinal direction of the product, and on the lower side. The disposable diaper in any one of Claims 1-5 comprised so that it may become low in steps or continuously.   The engaging region is provided so as to extend from the center in the width direction of the product toward the left and right side edges, and the engaging force with the hook element is maximized on the lower side in the vertical direction of the product, and on the upper side. The disposable diaper in any one of Claims 1-5 comprised so that it may become low in steps or continuously.

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