JP4804388B2 - Disposable diapers - Google Patents

Description

  The present invention is a disposable diaper

  A pants-type disposable diaper is generally configured to include an absorbent main body and an exterior body that is positioned on the non-skin contact surface side of the absorbent main body and fixes the absorbent main body (for example, Patent Documents). 1). In such a disposable diaper, an elastic member made of thread rubber, flat rubber, or the like is fixed in an extended state around the periphery of the waist opening, and the diaper is fixed to the wearer's body by a portion where the elastic member exists. ing.

  Apart from such a diaper, there is also known one using an elastic sheet for the exterior body for the purpose of improving the fit of the diaper to the wearer (see, for example, Patent Document 2). In addition, a technique has been proposed in which the exterior body is composed of two stretchable sheets stacked, and an elastic member is disposed in the waist opening and the leg opening (see Patent Document 3).

JP 2002-65733 A Japanese Patent Laid-Open No. Sho 62-162001 JP 2003-290284 A

If an elastic member made of thread rubber or flat rubber is fixed to the waist part of a disposable diaper that uses an elastic sheet for the exterior body, the elastic property of the waist part (peripheral part of the waist opening) can be reduced. It can be increased without being restricted by the expansion and contraction characteristics.
However, an exterior body made of an elastic sheet is difficult to be folded back so as to sandwich an elastic member because the width of the elastic sheet is reduced when the diaper is manufactured, and when the outer package expands and contracts when the diaper is used. The portion where the stretchable sheet is folded and fixed easily peels off from the portion where the portion is joined, and the exposed adhesive may cause discomfort to the skin.

  Accordingly, an object of the present invention is to obtain a good fit by the stretchable sheet and to enhance the stretchability characteristic of the waist by the waist elastic member, and to hold the waist elastic member in a predetermined position. It is providing the disposable diaper which the edge part by the side of the diaper of a part formation sheet cannot peel easily.

  The present invention is a disposable diaper comprising an absorbent main body including an absorbent core, and an exterior body positioned on the non-skin contact surface side of the absorbent main body and fixing the absorbent main body, The exterior body is formed using a stretchable sheet and has stretchability in the diaper width direction, and a waist end forming sheet made of a non-stretchable sheet is a waist elastic member at a waist portion of the diaper. Folded so as to wrap, the skin end of the waist end forming sheet located closer to the inner surface of the diaper than the waist end is joined to the non-stretch sheet facing the skin end through an adhesive The above-described object is achieved by providing a disposable diaper.

  According to the disposable diaper of the present invention, the stretchable sheet can provide good fit, and the waist elastic member can enhance the elastic property of the waist, and the waist elastic member is held in place. The end of the end forming sheet on the inner surface side of the diaper is difficult to peel off.

The present invention will be described below based on preferred embodiments with reference to the drawings.
A pants-type disposable diaper 1 (hereinafter also referred to as diaper 1) according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 to 5, the diaper 1 of the first embodiment includes a liquid-permeable top sheet 2, a liquid-impermeable or liquid-permeable (water repellency, etc.) back sheet 3 and both sheets 2, A substantially vertically long absorbent main body 10 having a liquid-retaining absorbent core 4 interposed between the three, and located on the back sheet 3 side (non-skin contact surface side) of the absorbent main body 10 And an exterior body 11 that fixes the absorbent main body 10.

  The exterior body 11 has an hourglass shape in which both side edges are bound inward in the central portion in the longitudinal direction, and defines the outline of the diaper. The exterior body 11 is divided in the longitudinal direction into an abdominal side A disposed on the wearer's abdomen, a back side B disposed on the dorsal side, and a crotch C positioned therebetween. The ventral portion A and the back portion B correspond to the longitudinal front and rear end portions of the exterior body 11, and the crotch portion C corresponds to the longitudinal center portion of the exterior body 11. The exterior body 11 has both side edges A1, A2 of the ventral side A and both side edges B1, B2 of the back side B joined together, and the disposable diaper 1 has a waist opening 5 and a pair of leg openings. 6 is formed. By this joining, a pair of side seal portions S, S are formed on the left and right side edges of the disposable diaper 1 to form a pants shape. For these bondings, for example, heat sealing, high frequency sealing, ultrasonic sealing, or the like is used.

  The top sheet 2, the back sheet 3 and the absorbent core 4 are integrated to form a vertically long absorbent main body 10. As the top sheet 2, the back sheet 3, and the absorbent core 4, various types conventionally used for this type of article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet. The absorbent core 4 may be composed of a superabsorbent polymer particle and a fiber material and covered with tissue paper (not shown).

  As shown in FIGS. 2 and 5, side cuffs 8 and 8 made of a liquid resistant or water repellent and breathable material are formed on the left and right sides of the absorbent body 10 in the longitudinal direction. . In the vicinity of the free end of each side cuff 8, a side cuff elastic member 81 is arranged in an extended state. Accordingly, when the disposable diaper 1 assembled as shown in FIG. 1 is worn, the side cuff 8 is erected by contraction of the side cuff elastic member 81, and the liquid in the width direction of the absorbent main body 10 is raised. Is prevented from flowing out. As shown in FIGS. 3 and 5, the sheet material 82 for forming the side cuffs 8, 8 has a predetermined width portion 82 </ b> S on the outer side in the width direction of the absorbent main body 10 on the skin contact surface side of the back sheet 3. , And is fixed between the absorbent core 4 and the back sheet 3, but may be fixed between the back sheet 3 and the outer package 11.

  As shown in FIGS. 3 to 5, the exterior body 11 has a structure in which an outer layer sheet 12 made of a stretchable sheet and an inner layer sheet 13 made of a non-stretchable sheet are laminated. The outer layer sheet 12 forms the outer surface of the diaper, and the inner layer sheet 13 is disposed on the inner surface side of the outer layer sheet 12. The stretchable sheet forming the outer layer sheet 12 only needs to have stretchability in at least the diaper width direction (left-right direction in FIG. 2) when the diaper is in an unfolded state (see FIG. 2). The non-stretchable sheet that forms the inner layer sheet 13 does not have stretchability at least in the diaper width direction when the diaper is in a developed state. Details of the outer layer sheet 12 and the inner layer sheet 13 will be described later.

In the peripheral part (waist part) 50 of the waist opening part 5 of each of the ventral part A and the back part B in the diaper 1 of this embodiment, the opening peripheral edge (waist end part) 5a, 5b of the waist opening part 5 is provided. A plurality of waist elastic members 51, 51.
Moreover, in the peripheral part (waist part) 50 of the waist opening part 5 of each of the stomach side part A and the back side part B in the diaper 1, as shown in FIG. 4, the waist edge part formation sheet 16 which consists of a non-stretch sheet | seat. However, the waist elastic members 51, 51. Are held or fixed at predetermined positions on the waist 50 by the waist end forming sheet 16.

  In the waist part 50 in the diaper 1 of the present embodiment, as shown in FIG. 4, the waist elastic member 51 is fixed by the adhesive 17 between the two opposing faces of the folded waist end part forming sheet 16. Has been. In addition, an adhesive is provided between the opposing surfaces of the outer end sheet 12 and the inner layer sheet 13 constituting the exterior body 11 and the end portions 12e, 13e, and 7e of the auxiliary sheet 7 described later, which are folded in half. 17 is fixed.

More specifically, as shown in FIG. 3, the waist end portion forming sheet 16 has a rectangular shape that is long in the diaper width direction, and covers the entire width of the ventral side portion A and the back side portion B. Are arranged. Further, as shown in FIG. 4, the waist end portion forming sheet 16 is folded in two with the positions of the opening peripheral edges (waist end portions) 5 a and 5 b of the waist opening 5 as fold lines. The skin side end portion 16a located on the inner side of the diaper (P side in FIG. 4) from 5b is joined to the end portion 7e of the auxiliary sheet 7 facing the skin side end portion 16a via the adhesive 17. Yes.
As shown in FIG. 4, in the same position as the skin side end 16a in the diaper longitudinal direction (X direction in FIG. 4), the end 12e of the outer layer sheet 12 made of an elastic sheet is located. The end portion 7e of the auxiliary sheet 7 is located between the skin side end portion 16a and the end portion 12e of the outer layer sheet 12, and the skin side end portion 16a is the end portion 7e of the auxiliary sheet 7 made of a non-stretchable sheet. It is joined to.
Thereby, it is prevented that the skin side edge part 16a peels toward the diaper inner surface side (P side in FIG. 4).

On the other hand, when the skin side end portion 16a of the waist end portion forming sheet 16 is directly fixed to the outer layer sheet 12, the outer layer sheet 12 is made of an elastic sheet that expands and contracts in the diaper width direction. When the diaper is manufactured, the skin side end portion 16a cannot be firmly fixed to the outer layer sheet 12, or the skin side end portion 16a is detached from the outer layer sheet 12 while the diaper is worn, and the exposed adhesive is worn by the wearer. It tends to cause inconveniences such as stickiness in contact with the skin.
In particular, in the diaper 1 of the present embodiment, the outer layer sheet 12 is bonded to the inner layer sheet 13 in a state of being extended in the diaper width direction. Therefore, in the natural state of the diaper 1, the outer layer sheet 12 is contracted as shown in FIG. 5, while the outer layer sheet 12 is stretched from the state while the diaper is worn, and further, The expansion and contraction is repeated following the change in the circumference of the waist. Therefore, while excellent fit is obtained for the ventral side A and the back side B, when the skin side end 16a is fixed to such a stretchable sheet, the skin side end 16a is peeled off. Although it is easy, as in the diaper 1 of the present embodiment, such inconvenience can be prevented by joining the skin side end portion 16a to the non-stretchable sheet.

  The length (length in the diaper width direction) in which the skin side end portion 16a of the waist end forming sheet 16 is fixed to the non-stretchable sheet facing the waist end portion 16a is the abdominal side portion A and the back side. It is preferably 50% or more with respect to the total width La, Lb (see FIG. 2) of each part B, more preferably 80% or more, and it is fixed over substantially the entire length in the diaper width direction. It is further preferable from the viewpoint of preventing peeling of the skin side end portion 16a. The width L2 (the length in the longitudinal direction of the diaper, see FIG. 4) in which the skin side end portion 16a of the waist end forming sheet 16 is fixed to the non-stretchable sheet facing the waist end portion 16a is 10 mm. It is preferable that it is above, and it is preferable that it is 15-130 mm.

  The end portion 7e of the auxiliary sheet 7 to be joined to the skin side end portion 16a in the present diaper 1 has the other surface opposite to the one side joined to the skin side end portion 16a, and the inner layer sheet by the adhesive 17 in the same manner. 13 end portions 13e. The end portion 13e of the inner layer sheet 13 is further joined to the end portion 12e of the outer layer sheet 12 by the adhesive 17, and the other surface of the end portion 12e of the outer layer sheet 12 is further formed by the adhesive 17 to form a waist end portion. The sheet 16 is joined to the outer end 16b. The outer side edge part 16b of the waist edge part formation sheet 16 is an edge part located in the diaper outer surface side (Q side in FIG. 4) from the waist edge parts 5a and 5b.

  As described above, in the present diaper 1, the skin side end portion 16 a is joined to the end portion 7 e of the auxiliary sheet 7. As shown in FIGS. 2 and 3, the auxiliary sheet 7 reinforces or assists the fixing of the longitudinal end of the absorbent main body 10 to the exterior body 11, and the end of the absorbent main body is the skin of the wearer. This prevents inconvenience due to direct contact with the diaper and has a long rectangular shape in the width direction of the diaper. In addition, the auxiliary seat 7 is disposed over the entire width of the abdominal side A and the back side B. As for the auxiliary sheet | seat 7, the both ends of the diaper width direction are being fixed to the side seal parts S and S, and the part (shaded part of FIG. 2) which covers the edge part of the absorptive main body 10 is absorptive by the adhesive agent which is not shown in figure. It is fixed to the main body 10.

The non-stretchable sheet, which is an object to be joined to the skin side end 16a of the waist end forming sheet 16, has a width (length in the diaper width direction) equal to or greater than the width of the absorbent body 10 (length in the diaper width direction). Preferably, it has a width (length in the diaper width direction) substantially equal to the width of the outer package 11.
The non-stretchable sheet is bonded (preferably bonded by an adhesive) to the outer package 11 or the outer layer sheet 12, or the outer surface side of the diaper from the waist end portions 5a and 5b of the waist end forming sheet 16 (FIG. 4). It is preferable to be bonded (preferably bonded with an adhesive) to a portion located on the Q side.
Moreover, the part located in the diaper outer side surface (Q side in FIG. 4) of the waist edge part formation sheet 16 from the waist edge parts 5a and 5b may function as this non-stretchable sheet. An example is shown in FIG.

  Further, the non-stretchable sheet to be joined to the skin side end portion 16a may be disposed so as to be in contact with some or all of the waist elastic members 51, 51. May be. The former is advantageous in that the strength of the waist portion 50 is increased to prevent inconvenience such as tearing of the waist portion 50 when worn, and the latter is advantageous in that the waist portion 50 can be softened.

  In the present diaper 1, the end portion 12 e of the outer layer sheet made of a stretchable sheet is located on the crotch C side (the lower side in FIG. 4) from the position of the waist elastic member 51 in each of the ventral side portion A and the back side portion B. Is located on the side). In the diaper longitudinal direction (X direction in FIG. 4), when the position of the waist elastic member 51 and the stretchable sheet overlap, gradually increasing the diameter of the waist opening, and observing the change in stress at that time, Stress suddenly increases from a certain point. This means that the size range around the waist of the wearer that can be handled with one size diaper is narrow, but by not overlapping the waist elastic member 51 and the elastic sheet, The range of dimensions around the waist can be expanded.

The diaper 1 will be further described.
In this diaper 1, between the outer layer sheet 12 and the inner layer sheet 13 in each of the ventral portion A and the back portion B, the side seal portions A1, A2, B1, and B2 are heat sealed, high frequency sealed, or super They are joined together by a sonic seal. An adhesive such as a hot melt adhesive may be used in combination with heat sealing, high frequency sealing, ultrasonic sealing, or the like. The peripheral edge 50 of the waist opening 5 and the peripheral edge 60 of each of the pair of leg openings 6 are joined together by an adhesive such as a hot-melt adhesive. And between the outer layer sheet | seat 12 and the inner layer sheet | seat 13 in each of the ventral | abdominal side part A and the back | dorsal side part B is not joined in most parts except these parts. Specifically, between the outer layer sheet 12 and the inner layer sheet 13, the side seal portions A 1, A 2, B 1, B 2, the peripheral edge portion 50 of the waist opening 5, and the peripheral edge portions 60 of each of the pair of leg openings 6. And it is joined in the diaper width direction center part of each of the abdominal part A and the back part B, and it is not joined in parts other than those. The adhesive 14 in FIG. 5 is an adhesive that joins the central part of the diaper width direction of the ventral side A.

  Thus, in a wide range in the ventral side A and the back side B, the stretchability of the outer layer sheet 12 is damaged by the adhesive by not joining the outer layer sheet 12 and the inner layer sheet 13. The back side part B and the abdominal side part A each have good stretchability, and the back side part B and the abdominal side part A fit the wearer well when worn. In addition, by making it possible to minimize the portion hardened by the adhesive, the outer surface of the diaper and the portion not covered by the absorbent main body 10 on the inner surface of the exterior body 11 are made soft and comfortable to the touch. Can do. Moreover, when breathable sheets, such as a nonwoven fabric, are used as the outer layer sheet 12 and the inner layer sheet 13, the breathability is maintained satisfactorily, so that a diaper that is not stuffy can be provided.

In addition, leg elastic members 61a and 61b are arranged along the peripheral edge of each opening on the peripheral edge 60 and 60 of the leg opening that exists across the abdominal part A, crotch C and back side B. Has been. These leg elastic members 61 a and 61 b are fixed in an extended state between the outer layer sheet 12 and the inner layer sheet 13 via an adhesive 62.
In the peripheral edge part 50 of the waist opening part 5, the waist part elastic member 51 is being fixed via the adhesive agent 17 between the waist end part formation sheets 16 folded in half. Further, at the peripheral edge portions 60 and 60 of the pair of leg openings 6, the outer layer sheet 12 and the inner layer sheet 13 are joined, and the leg elastic members 61 a and 61 b are fixed between the sheets 12 and 13. Therefore, the fit of the peripheral edge portions 60 and 60 of the leg opening 6 and the peripheral edge portion 50 of the waist opening 5 can be enhanced without being restricted by the expansion and contraction characteristics of the elastic sheet constituting the outer layer sheet 12. .
As the waist elastic member 51 and the leg elastic members 61a and 61b, elastic materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot melt elastic member are made into a thread (thread rubber) or a belt (flat), respectively. Those formed on rubber) are preferably used.

The elastic sheet used for the outer layer sheet 12 of the diaper 1 will be described.
The outer layer sheet 12 has elasticity as described above. “Elasticity” means that the maximum elongation in at least one direction is 100% or more, and the elongation is 100% or more in one direction, the elongation is 100% or more and then stretched when contracted. It means that the recovery rate (elongation recovery rate at 100% elongation) is at least 70% or more. In the case of an elastic sheet having a plurality of directions having a maximum elongation of 100% or more, the elongation recovery rate may be 70% or more in only one of the directions.

  The outer layer sheet 12 can extend larger in the diaper width direction than in the diaper longitudinal direction (vertical direction in FIG. 2). More specifically, in the diaper width direction, it stretches greatly and contracts after stretching (maximum elongation of 100% or more and elongation recovery rate of 70% or more), but in the diaper longitudinal direction, it stretches only slightly (for example, , Maximum elongation of 50% or less).

The elongation recovery rate of the elastic sheet is measured by the following measuring method.
[Method for measuring elongation recovery rate]
A sample piece of an elastic sheet having a length of 50 mm and a width of 25 mm is prepared, and a chuck interval K is used by using a tensile testing machine ("Tensilon" RTC-1150A manufactured by Orientec Co., Ltd.).
After fixing the sample piece to 0 and stretching it to the length K2 at the time of 100% elongation at a speed of 300 mm / min (K2 = K0 × 2), the stress began to return at the same speed as the tensile speed. The length of the sample piece at that time is defined as a length K1 after recovery from elongation. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = [(K2−K1) / (K2−K0)] × 100

  As the stretchable sheet forming the outer layer sheet 12, various sheets having stretchability can be used. For example, the outer layer sheet 12 is preferably formed of a nonwoven fabric made of thermoplastic fibers from the viewpoint of improving air permeability. In addition, the outer layer sheet 12 is preferably made of a laminated sheet from the viewpoint of improving the texture, and at least the layer on the non-skin contact surface side is formed of an air-through nonwoven fabric. An elastic sheet made of elastic fiber (elastomer) having elasticity is generally not preferable from the viewpoint of texture because it gives a slimy feeling when touched.

  More specifically, as the stretchable sheet forming the outer layer sheet 12, for example, (1) a sheet in which a stretchable fiber layer is integrated on both sides or one side of an elastic fiber layer, and (2) a net-like sheet A sheet in which stretchable fiber layers are integrated on both sides or one side of the elastic sheet, (3) a sheet in which stretchable fiber layers are integrated on both sides or one side of the elastic sheet, (4) A stretchable sheet in which a large number of elastic filaments arranged so as to extend in one direction without intersecting each other is bonded to a stretchable nonwoven fabric over their entire length in a substantially non-stretched state can be preferably used. Examples of the method of integrating the elastic fiber layer and the extensible fiber layer include, for example, laminating them and hydroentangled them, or entangled fibers by air-through, etc., heat embossing, adhesive, ultrasonic bonding, etc. The method of letting it be mentioned.

  As the sheet of (1), for example, (a) a substantially inelastic non-elastic fiber layer is disposed on at least one surface of the elastic fiber layer, and both fiber layers have a fiber form of the constituent fibers of the elastic fiber layer. In a state where the fibers are kept in contact with each other by thermal fusion at the intersection of the fibers, a part of the constituent fibers of the inelastic fiber layer has entered the elastic fiber layer and / or a part of the constituent fibers of the elastic fiber layer Examples include stretchable nonwoven fabrics that are in a state of entering into the inelastic fiber layer. Moreover, as said (1)-(3) sheet | seat, it has (b) the elastic layer which has elastic elasticity, and a substantially inelastic nonelastic fiber layer, and both the said layers are laminated | stacked on the thickness direction. A stretchable sheet obtained by stretching a partially bonded laminated sheet can be preferably used.

  The stretchable nonwoven fabric (a) will be described. At the interface between the elastic fiber layer and the non-elastic fiber layer and in the vicinity thereof, the intersection of the constituent fiber of the elastic fiber layer and the constituent fiber of the non-elastic fiber layer is heat-sealed, and it is bonded substantially uniformly over the entire surface. Has been. By joining all over, it is prevented that both layers are separated and a space is formed, and a stretchable nonwoven fabric having a multi-layer structure with a sense of unity, such as a single nonwoven fabric. "The state in which the constituent fibers of the elastic fiber layer maintain the fiber form" means that even if most of the constituent fibers of the elastic fiber layer are given heat, pressure, etc., the film or film-fiber structure A state that is not deformed. In the elastic fiber layer, the intersections of the constituent fibers are thermally fused in the layer. Similarly, in the non-elastic fiber layer, the intersection of the constituent fibers is thermally fused in the layer.

  When non-elastic fiber layers are arranged on both sides of the elastic fiber layer, at least one of the constituent fibers is in a state where a part of the constituent fibers enter the elastic fiber layer and / or one of the constituent fibers of the elastic fiber layer. The part is in a state of entering at least one of the inelastic fiber layers. In order to allow the constituent fibers of the non-elastic fiber layer to enter the elastic fiber layer and / or to allow the constituent fibers of the elastic fiber layer to enter the non-elastic fiber layer, the constituent fibers of the elastic fiber layer and the constituent fibers of the non-elastic fiber layer are changed. It is preferable that at least one of the non-elastic fiber and the elastic fiber is in a web state (a state where heat fusion is not performed) before the heat fusion treatment. From the viewpoint of allowing the constituent fibers to enter other layers, the fiber layer in the web state is preferable because the short fibers have a higher degree of freedom than the long fibers.

  Moreover, it is preferable to use the air-through method in order to allow the constituent fibers of the non-elastic fiber layer to enter the elastic fiber layer and / or to allow the constituent fibers of the elastic fiber layer to enter the non-elastic fiber layer. By using the air-through method, the constituent fibers can be made to enter the opposing fiber layer, and the constituent fibers can be easily made to enter from the opposing fiber layer. Further, by using the air-through method, it becomes easy to allow the constituent fibers of the inelastic fiber layer to enter the elastic fiber layer while maintaining the bulkiness of the inelastic fiber layer. In particular, when the constituent fibers of the inelastic fiber layer are entangled with the constituent fibers of the elastic fiber layer, it is preferable that they are entangled only by the air-through method. In order to entangle the fibers by the air-through method, the gas blowing pressure, the blowing speed, the basis weight and thickness of the fiber layer, the conveyance speed of the fiber layer, etc. may be adjusted appropriately. Preferably it is done.

  In the hot air treatment (particularly, the air-through method), a part of the constituent fibers of the non-elastic fiber web enters the elastic fiber web, and at the same time, the constituent fibers of the non-elastic fiber web and / or the constituent fibers of the non-elastic fiber web are elastic. The constituent fibers of the fiber web are heat-sealed at their intersections. In this case, care should be taken so that the constituent fibers of the elastic fiber web do not become a film or film-fiber structure by the hot air treatment.

  The elastic fiber layer has a property that it can be stretched and contracts when tension is released. The elastic fiber layer preferably has a residual strain of 20% or less, particularly 10% or less when contracted after 100% elongation in at least one direction parallel to the surface. This residual strain value is preferably satisfied at least in the diaper width direction, and more preferably in both the diaper width direction and the diaper longitudinal direction.

  The elastic fiber layer is an aggregate of fibers having elasticity. Examples of a method for forming an elastic fiber include a melt blown method in which a molten resin is extruded from a nozzle hole, and the extruded molten resin is elongated with hot air to thin the fiber, and a semi-molten resin is cooled with cold air. There is also a spunbond method in which stretching is performed by a mechanical draw ratio. As a special method of the melt blown method, there is a spinning blow method in which the spun bond method is combined with the melt blown method.

  The elastic fiber layer may be in the form of a web or a nonwoven fabric made of elastic fibers. For example, it may be a web or a non-woven fabric formed by a spinning blow method, a spun bond method, a melt blow method, or the like. As the constituent fiber of the elastic fiber layer, for example, a fiber made of thermoplastic elastomer, rubber or the like can be used. In particular, fibers made from thermoplastic elastomers can be melt-spun using an extruder in the same way as ordinary thermoplastic resins, and the fibers thus obtained are easily heat-sealed. Is suitable for stretchable nonwoven fabrics.

  Examples of the thermoplastic elastomer include styrene elastomers such as SBS, SIS, SEBS, and SEPS, olefin elastomers, polyester elastomers, and polyurethane elastomers. These can be used individually by 1 type or in combination of 2 or more types.

  The inelastic fiber layer has extensibility but is substantially inelastic. As used herein, extensibility refers to the case where the constituent fiber itself is stretched, and even if the constituent fiber itself is not stretched, the two fibers that have been heat-sealed at the intersection of the fibers are separated from each other, or the fibers are heat-sealed. For example, the three-dimensional structure formed by a plurality of fibers may be structurally changed, the constituent fibers may be broken, and the entire fiber layer may be elongated.

  Examples of the fibers constituting the inelastic fiber layer include fibers made of polyethylene (PE), polypropylene (PP), polyester (PET or PBT), polyamide, and the like. The fibers constituting the inelastic fiber layer may be short fibers or long fibers, and may be hydrophilic or water repellent. Further, core-sheath type or side-by-side composite fibers, split fibers, irregularly shaped cross-section fibers, crimped fibers, heat-shrinkable fibers, and the like can also be used. These fibers can be used singly or in combination of two or more. The inelastic fiber layer can be a continuous filament or short fiber web or nonwoven.

  The stretchable sheet (b) will be described. This stretchable sheet is a laminate sheet in which substantially inelastic nonelastic fiber layers are laminated on both sides or one side of an elastic layer having elastic stretchability, and these are partially joined in a regular pattern. It can be obtained by stretching.

  This laminated sheet is manufactured as follows, for example. On the fiber web (first inelastic fiber layer) supplied from the card machine, an elastic fiber is supplied to form an elastic layer, on which another card machine or fiber web (second inelastic fiber layer) is formed. Fiber layer). The obtained laminated sheet having a three-layer structure is subjected to hot air treatment by an air-through dryer. The laminated sheet after the hot air treatment is subjected to hot embossing by an embossing device including an embossing roll in which embossing convex portions are regularly arranged on the peripheral surface and an anvil roll arranged to face the embossing roll. In addition, although the hot air process with a dryer is performed for the purpose of the heat | fever fusion | bonding of an elastic fiber and a non-elastic fiber, and the penetration | invasion of a fiber, this hot air process is also omissible.

  The elastic layer preferably includes elastic fibers made of an elastic material. Examples of the elastic material include a thermoplastic elastomer, rubber, ethylene / propylene copolymer, and the like. Among these, a thermoplastic elastomer is preferable because a fibrous elastic body can be formed relatively easily. Examples of the thermoplastic elastomer include polyurethane, styrene (SBS, SIS, SEBS, SEPS, etc.), olefin (copolymers such as ethylene, propylene, butene, etc.), vinyl chloride, and polyester. These can be used individually by 1 type or in combination of 2 or more types. The content of elastic fibers made of an elastic material in the elastic layer is preferably 50 to 100% by weight, particularly 75 to 100% by weight. As an elastic layer, it can replace with what consists of a fiber layer, and a film-like thing, a net-like thing, etc. can also be used. As the film or net forming material, the above-mentioned various elastic materials can be used.

The stretchable sheet (4) will be described.
As the elastic filament, for example, an elastic resin obtained by spinning an elastic resin spun from a spinning nozzle in a melted or softened state 1.1 to 400 times (more preferably 4 to 100 times) is used. be able to. Examples of the elastic resin include thermoplastic elastomers and rubbers. In particular, when a thermoplastic elastomer is used as a raw material, melt spinning using an extruder is possible in the same way as a normal thermoplastic resin, and the filament thus obtained is suitable because it can be easily heat-sealed to a nonwoven fabric. is there. Examples of the thermoplastic elastomer include various materials described as the elastic fiber material described above, and these can be used alone or in combination of two or more. A core-sheath type or side-by-side type composite fiber made of these resins can also be used. In particular, it is preferable to use a styrene-based elastomer, an olefin-based elastomer, or a combination thereof in terms of moldability, elastic properties, and cost of the elastic filament.

  The elastic filament is bonded to the nonwoven fabric in a substantially non-stretched state. As a mode of joining the elastic filament and the nonwoven fabric, for example, fusion, adhesion with an adhesive, or the like can be given. The elastic filaments are preferably bonded to the nonwoven fabric by fusion, and the elastic filaments are preferably bonded to these nonwoven fabrics while being sandwiched between two identical or different nonwoven fabrics. The nonwoven fabric to which the elastic filament is bonded can be extended in the same direction as the direction in which the elastic filament extends. Stretchable refers to the case where the constituent fibers themselves of the nonwoven fabric are stretched, and even if the constituent fibers themselves are not stretched, the fibers that are joined at the intersection point are separated from each other, or the fibers are joined by joining the fibers. This includes the case where the formed three-dimensional structure is structurally changed, the constituent fibers are broken, and the whole nonwoven fabric is elongated. The elastic filament preferably has a diameter of 10 to 200 μm, particularly 20 to 130 μm. The elastic filament is bonded to the non-woven fabric over its entire length. It does not require that all the fibers in contact with the elastic filament (component fibers of the non-woven fabric) are bonded to the elastic filament. In addition, it means that the elastic filaments and the constituent fibers of the nonwoven fabric are joined in such a manner that there is no intentionally formed non-joined part. Since the elastic filament is bonded to the nonwoven fabric over its entire length, the bonding force between the elastic strand and the nonwoven fabric can be sufficiently increased. As a result, even if the stretchable sheet is stretched, the elastic filament is difficult to peel from the nonwoven fabric. If the elastic filament is peeled from the nonwoven fabric, in the natural state (relaxed state), floating occurs between the elastic filament and the nonwoven fabric, and wrinkles are easily generated in the stretchable sheet.

  Next, the non-stretchable sheet which comprises the inner layer sheet | seat 13, the waist edge part formation sheet 16, and the auxiliary sheet | seat 7 is demonstrated. The non-stretch sheet refers to a sheet having an elongation recovery rate (%) measured by the above [Method for measuring elongation recovery rate] of 20% or less, or a sheet that breaks before 100% elongation. The non-stretchable sheet may or may not have extensibility, but the maximum elongation is preferably 90% or less.

  As the non-stretch sheet, a nonwoven fabric, a laminated material of a nonwoven fabric and a resin film, a porous film, and the like are preferable. The non-stretch sheet is preferably formed from a nonwoven fabric made of thermoplastic fibers from the viewpoint of improving air permeability and texture, and is formed from a water-repellent nonwoven fabric from the viewpoint of preventing excrement leakage. Are preferred.

Next, disposable diapers according to other second to sixth embodiments of the present invention will be described.
About the diaper of 2nd-6th embodiment, a different point from the diaper 1 of 1st Embodiment is mainly demonstrated, About the same point, the same code | symbol is attached | subjected and description is abbreviate | omitted. About the point which is not demonstrated in particular, the description about the diaper 1 mentioned above is applied suitably.

The exterior body 11 in the diaper 1A of 2nd Embodiment is comprised from the sheet | seat 1 of the outer layer which consists of an elastic sheet, as shown in FIG. And in each waist part 50 of the abdominal part and back part in diaper 1A, as shown in FIG. 6, each end part 12e and 7e of the outer-layer sheet | seat 12 and the auxiliary sheet | seat 7 which comprise the exterior body 11 are two. It is fixed via an adhesive 17 between two opposing surfaces of the folded waist end forming sheet 16.
And the skin side edge part 16a of the waist edge part formation sheet 16 is joined with the edge part 7e of the auxiliary sheet 7 facing this skin side edge part 16a, and the other surface of the edge part 7e of the auxiliary sheet 7 is Similarly, the adhesive 17 is joined to the end 12e of the outer layer sheet 12. Further, the other surface of the end portion 12 e of the outer layer sheet 12 is further joined to the outer end portion 16 b of the waist end portion forming sheet 16 by an adhesive 17.

As shown in FIG. 7, the exterior body 11 in the disposable diaper 1B of the third embodiment has a structure in which an outer layer sheet 12 made of a stretchable sheet and an inner layer sheet 13 made of a non-stretchable sheet are laminated. . And in each waist part 50 of the abdominal side part and back side part in diaper 1B, as shown in FIG. 7, each edge part 12e and 13e of the outer-layer sheet 12 and the inner-layer sheet 13 which comprise the exterior body 11 are two. It is fixed via an adhesive 17 between two opposing surfaces of the folded waist end forming sheet 16.
And the skin side edge part 16a of the waist edge part formation sheet 16 is joined with the edge part 13e of the inner layer sheet 13 which opposes this skin side edge part 16a, and the other surface of the edge part 13e of the inner layer sheet 13 is Similarly, the adhesive 17 is joined to the end 12e of the outer layer sheet 12. Further, the other surface of the end portion 12 e of the outer layer sheet 12 is further joined to the outer end portion 16 b of the waist end portion forming sheet 16 by an adhesive 17.

As shown in FIG. 8, the exterior body 11 in the disposable diaper 1C of the fourth embodiment has a structure in which an outer layer sheet 12 made of an elastic sheet and an inner layer sheet 13 made of a non-elastic sheet are laminated. . And in the waist part 50 of each of the ventral | abdominal part and back | dorsal part in the diaper 1C, as shown in FIG. 8, between the two opposing surfaces of the waist end part forming sheet 16 folded in half, the outer layer sheet 12 The end 12 a is fixed via an adhesive 17.
And the skin side edge part 16a of the waist edge part formation sheet 16 is connected to the edge part 13a of the inner layer sheet | seat 13 located in the diaper inner surface side P from this skin side edge part 16a via the adhesive agent 18 in the thickness direction of a diaper. It is joined. The other surface of the skin side end portion 16a is joined to the end portion 12e of the outer layer sheet 12 by an adhesive 17, and the other surface of the end portion 12e of the outer layer sheet 12 is further bonded to the waist end portion by an adhesive 17 It is joined to the outer end 16 b of the forming sheet 16.

  According to the diapers 1 </ b> A to 1 </ b> C of the second to fourth embodiments, the skin side end portion 16 a is on the end portion 7 e of the auxiliary sheet 7 made of a non-stretchable sheet or the end portion 13 e of the inner layer sheet 13 made of a non-stretchable sheet. By joining, the effect similar to the diaper 1 of 1st Embodiment is show | played, such as peeling of the skin side edge part 16a being prevented. However, like the diapers 1, 1B, and 1C of the first, third, and fourth embodiments, the exterior body 11 includes an inner layer sheet 13 made of a non-stretchable sheet and an outer layer sheet 12 made of a stretchable sheet. It is preferable from the viewpoint of fixing the absorbent main body 10 and maintaining or improving the stretchability of the outer layer sheet 12 to obtain a good fit, and like the diaper 1C, Since the skin side end portion 16a is joined to the non-stretchable sheet located on the inner surface side of the diaper with respect to the skin side end portion 16a in the thickness direction of the diaper, it becomes difficult for fingers to be caught when the diaper is pulled up This is preferable from the viewpoint of preventing a problem that the joint is peeled off.

In the diapers 1D and 1E of the fifth and sixth embodiments, the stretchable sheet 12 constituting the exterior body 11 has a non-stretchable extension portion 16, and the non-stretchable extension The portion 16 constitutes the waist end forming sheet 16.
In the waist part 50 of each of the ventral part and the back part in the diapers 1D and 1E of the fifth and sixth embodiments, as shown in FIGS. The waist elastic member 51 is fixed by the adhesive 17 between the two facing surfaces.
The skin side end portion 16a of the waist end portion forming sheet 16 in the diaper 1D of the fifth embodiment is fixed to the end portion 7e of the auxiliary sheet 7 located on the outer diaper side Q of the skin side end portion 16a with an adhesive. Has been. The skin side end portion 16a of the waist end portion forming sheet 16 in the diaper 1E of the sixth embodiment is bonded to the outer end portion 16b of the waist end portion forming sheet 16 which is opposed to the end portion 16a by folding in half. It is joined via the agent 17.

  Also by the diapers 1D and 1E of the fifth and sixth embodiments, the skin side end portion 16a is joined to the non-stretched portion in the same manner as the non-stretchable sheet. The effect similar to the diaper 1 of 1st Embodiment is produced, such as being prevented.

  To make a part of the elastic sheet non-stretchable, a method of heating with a heated metal roll, hot air, steam or the like, a method of applying pressure at the same time as heating, a method of bonding a non-stretchable sheet over substantially the entire surface, What is necessary is just to reduce or delete the function of the elastic fiber etc. which expresses elasticity by the method of apply | coating an appropriate amount of adhesives.

  Further, the adhesive for joining the skin side end portion 16a of the waist end forming sheet 16 to the non-stretchable sheet is an adhesive for holding or fixing the waist elastic member 51 between the waist end forming sheets 16 folded in half. It may be the same as or different from the agent. As the adhesive used in the present invention, various known adhesives conventionally used for disposable diapers and the like can be used, and a hot melt adhesive is preferable. In the present invention, the skin side end portion 16a of the waist end portion forming sheet 16 is difficult to peel off even when using an adhesive that exhibits tackiness even after several days have passed since coating. It is possible to prevent inconveniences such as the adhesive being exposed to the skin.

As mentioned above, although embodiment of this invention was described, this invention is not restrict | limited to said each embodiment, It can change suitably.
For example, in the disposable diaper of the present invention, the exterior body 11 in the abdominal side A and the back side B has a structure in which an inner layer sheet 13 made of a non-stretchable sheet and an outer layer sheet 12 made of a stretchable sheet are laminated. The exterior body 11 in the crotch part C may be composed of only one non-stretchable sheet.
Moreover, the disposable diaper of the present invention is a so-called unfolded type of diapers that fastens fastening tapes provided on both sides of the back side part to a landing tape provided on the outer side of the abdomen part, in addition to a pants-type disposable diaper. It may be a disposable diaper.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

FIG. 1 is a partially broken perspective view showing a pants-type disposable diaper according to a first embodiment of the present invention. FIG. 2 is a developed plan view showing a developed and extended state of the disposable diaper shown in FIG. 1. FIG. 3 is an exploded perspective view of the disposable diaper shown in FIG. 1. 4 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 5 is a cross-sectional view taken along the line III-III in FIG. 2 in a state in which the diaper is contracted. FIG. 6 is a cross-sectional view (corresponding to FIG. 4) of the disposable diaper of the second embodiment. . FIG. 7 is a cross-sectional view (corresponding to FIG. 4) of the disposable diaper of the third embodiment. . FIG. 8 is a cross-sectional view (corresponding to FIG. 4) of the disposable diaper of the fourth embodiment. . FIG. 9 is a cross-sectional view (corresponding to FIG. 4) of the disposable diaper of the fifth embodiment. . FIG. 10 is a cross-sectional view (corresponding to FIG. 4) of the disposable diaper of the sixth embodiment. .

Explanation of symbols

1,1A-1D Pants-type disposable diapers 2 Top sheet 3 Back sheet 4 Absorbent core 5 Waist opening 6 Leg opening 10 Absorbent body 11 Exterior body 12 Outer sheet made of stretchable sheet 13 Outer layer made of non-stretchable sheet Sheet 16 Waist edge forming sheet 16a Skin side edge of waist edge forming sheet 16b Outer edge of waist edge forming sheet 51 Waist elastic member

Claims (7)

A disposable diaper comprising an absorbent main body including an absorbent core and an exterior body positioned on the non-skin contact surface side of the absorbent main body and fixing the absorbent main body,
The exterior body is formed using an elastic sheet and has elasticity in the diaper width direction,
In the waist part of the diaper, a waist end forming sheet made of a non-stretchable sheet is folded so as to wrap the waist part elastic member, and the skin located on the inner side of the diaper from the waist end part of the waist end forming sheet The disposable diaper by which the side edge part is joined via the adhesive agent to the non-stretch sheet | seat which opposes this skin side edge part.   The disposable diaper according to claim 1, wherein the skin-side end portion is joined to a non-stretchable sheet located on the outer surface side of the diaper from the skin-side end portion in the thickness direction of the diaper.   The auxiliary sheet | seat which consists of a non-stretch sheet | seat is distribute | arranged so that the edge part of the longitudinal direction of the said absorptive main body may be arranged, The said skin side edge part is joined to this auxiliary sheet | seat. Disposable diapers.   The disposable diaper in any one of Claims 1-3 with which the said waist end part formation sheet separate from this elastic sheet is connected with the said elastic sheet.   The stretchable sheet has a non-stretched extension part, and the non-stretched extension part constitutes the waist end forming sheet. Or disposable diapers.   The disposable diaper according to any one of claims 1 to 5, wherein the exterior body has a structure in which an inner layer sheet made of a non-stretchable sheet and an outer layer sheet made of the stretchable sheet are laminated.   The disposable diaper in any one of Claims 1-6 in which the edge part of the said elastic sheet is located in the crotch part side from the position of the said waist part elastic member in each of a stomach side part and a back side part.

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