JP2007260148A - Pants-type absorbent article and manufacturing method thereof - Google Patents

Abstract

The present invention provides a pant-type absorbent article that is excellent in the appearance of a diaper before or during wearing, is easy to wear, and does not easily tear an outer packaging material or peel off an absorbent main body.
A pant-type absorbent article 1 comprising an absorbent main body 10 including an absorbent core 4 and an outer packaging material 11 disposed on the non-skin contact surface side of the absorbent main body 10, wherein the absorbent article has an absorbent property. The core 4 is composed of a plurality of core pieces 43 divided at least in the width direction at least in the crotch portion C, and the outer packaging material 11 is formed using an elastic sheet, and the absorbent main body 10 is The outer packaging material 11 is stretched in the width direction of the absorbent article.
[Selection] Figure 4

Description

  The present invention relates to a pants-type absorbent article and a method for producing the same.

Conventionally, as an underpants-type disposable diaper, an absorbent main body including an absorbent core, and an absorbent main body for the purpose of achieving an improved fit to the wearer and a non-diaper (no wrinkle-induced wrinkle) appearance. A disposable diaper provided with an outer packaging material made of an elastic material, which is disposed on the non-skin contact surface side, has been proposed. However, even if the outer packaging material is generally stretchable, the absorbent main body fixed to the outer packaging material hardly stretches. Therefore, when trying to spread such a diaper, it is difficult to spread or the absorbent body There is a problem in that the stretchable material is loaded at the boundary between the portion where there is and the portion where there is no, and the cut (break) occurs.
Then, what joined the absorptive main body containing an absorptive core at a plurality of places greatly separated in the plane direction is known so that expansion and contraction of an outer packaging material may not be inhibited (refer to patent documents 1 and 2).
However, when the absorbent main body and the outer packaging material are joined at a plurality of locations that are largely separated in the plane direction, the absorbent main body may peel off from the outer packaging material when the outer packaging material is extended.
In addition, even if the outer packaging material has elasticity, the absorbent main body fixed to the outer packaging material hardly expands and contracts. There is a case that the appearance does not become clean due to bumping, and the width of the crotch part is not so narrow, and there is a problem that it is not sufficient in terms of ease of wearing.

Utility Model Registration No. 2589680 No. 6-5782

  Accordingly, an object of the present invention is to provide a pant-type absorbent article that is excellent in the appearance of a diaper before or during wearing, is easy to put on, and does not easily cause tearing of the outer packaging material or peeling of the absorbent main body, and such a pant-type An object of the present invention is to provide a method for producing a pant-type absorbent article that can stably and continuously produce the absorbent article.

  The present invention is a pants-type absorbent article comprising an absorbent main body including an absorbent core and an outer packaging material disposed on the non-skin contact surface side of the absorbent main body, wherein the absorbent core is at least A portion disposed in the crotch portion is composed of a plurality of core pieces divided in the width direction, and the outer packaging material is formed using an elastic sheet, and the absorbent main body is formed in the width direction of the absorbent article. The object is achieved by providing a pant-type absorbent article that is fixed to the outer packaging material in a state of being stretched.

  Further, the present invention is a method for producing the pant-type absorbent article, wherein the outer packaging material has a configuration in which the outer packaging material is continuous in a band shape, and the outer packaging material continuous body that is conveyed in a stretched state in the longitudinal direction, A process of obtaining an absorbent article continuum by intermittently fixing the absorbent main body, and folding the absorbent article continuum in two, forming a side seal portion, cutting and separating into individual absorbent articles The object is achieved by providing a method for producing a pant-type absorbent article comprising the step of:

The pants-type absorbent article of the present invention is excellent in the appearance of a diaper before or during wearing, is easy to wear, and is less likely to break the outer packaging material or peel off the absorbent main body.
According to the method for producing a pant-type absorbent article of the present invention, the pant-type absorbent article can be stably and continuously produced.

The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 shows a perspective view of a pants-type disposable diaper as an embodiment of the pants-type absorbent article of the present invention. FIG. 2 shows a plan view of the developed state of the diaper shown in FIG. FIG. 3 shows an exploded perspective view of the diaper shown in FIG. 4 shows a cross-sectional view taken along the line II-II of FIG. 2 in a state where the diaper shown in FIG. 1 is naturally contracted.

  The pants-type disposable diaper 1 of the present embodiment includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and a liquid-retaining absorbent body 4 interposed between both sheets 2 and 3. A substantially vertically long absorbent main body 10 and a stretchable outer packaging material 11 disposed on the back sheet 3 side (non-skin contact surface side) of the absorbent main body 10.

  The outer packaging material 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 diaper 1 is divided in the longitudinal direction in the unfolded state 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. In the outer packaging material 11, both side edges A 1 and A 2 on the ventral side A and both side edges B 1 and B 2 on the back side B are joined to each other, and the pair of side seal parts S is attached to the diaper 1 by the joining. , S, a waist opening 5 and a pair of leg openings 6 are formed.

  As shown in FIG. 2, 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 main 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 disposed in an extended state. When the diaper is worn, the elastic member 81 is contracted, so that the side cuff 8 is erected and the outflow of the liquid in the width direction of the absorbent main body 10 is prevented. In FIG. 3, a sheet material for forming the side cuffs 8 and 8 is indicated by reference numeral 82. In the completed diaper 1, the sheet material 82 has a portion 82 </ b> S having a predetermined width on the outer side in the width direction of the absorbent main body 10 wound down on the non-skin contact surface side of the back sheet 3. It is fixed via an adhesive 16 between both side portions 2S of the surface sheet 2 that is wound down to the non-skin contact surface side and the outer packaging material 11. Both side portions 2 </ b> S of the top sheet 2 are also fixed to the back sheet 3 with an adhesive 17.

The outer packaging material 11 will be described in detail.
The outer packaging material 11 in the disposable diaper of the present invention has stretchability at least in the width direction of the diaper (left-right direction in FIG. 2, hereinafter also referred to as “diaper width direction”).
As shown in FIGS. 3 and 4, the outer packaging material 11 in the present embodiment has a structure in which two elastic sheets 12 and 13 are laminated, and one elastic sheet 12 is the diaper 1. The other elastic sheet 13 is formed on the inner surface side of the elastic sheet 12 and is partially joined to the elastic sheet 12. These two elastic sheets 12 and 13 give the outer packaging material 11 elasticity in the diaper width direction.

In the present specification, the “extensible sheet” means a sheet having a maximum elongation in at least one direction of 100% or more (a sheet having a length extending twice or more). “Elastic sheet” refers to the elongation recovery rate when the sheet is stretched to 100% elongation in one direction where the maximum elongation is 100% or more (the elongation recovery at 100% elongation). Ratio) is at least 70% or more. In the case of having a plurality of directions where the maximum elongation is 100% or more, the case where the elongation recovery rate is 70% or more in any one of the directions corresponds to “having stretchability”.
The stretchable sheet in the present invention is different from a conventionally used gather type stretchable material in which an elastic member is fixed in a stretched state to a substantially non-stretchable sheet material to provide stretchability. It expresses elasticity.

  In the present embodiment, the two stretchable sheets 12 and 13 can be extended more in the diaper width direction than in the longitudinal direction of the diaper (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 disposable diaper is often designed to be smaller than the infant's body shape in its unstretched state. In order for the mother to wear the diaper on the infant, the outer packaging material 11 preferably has an elongation of 100% or more. Moreover, by using an elastic sheet having an elongation recovery rate of 70% or more in the diaper width direction, the diaper can be fitted to the body shape, and it is possible to prevent the appearance from slipping or slipping off.

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 a stretchable sheet having a length of 50 mm and a width of 25 mm is prepared, and the sample piece is fixed to the chuck interval L ₀ using a Tensilon device, and the length L _b when stretched 100% at a speed of 300 mm / min ( After extending to L _b = L ₀ × 2), the length of the sample piece when the stress becomes zero after starting to return at the same speed as the tensile speed is defined as the length L _a after recovery from extension. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = [(L _b −L _a ) / (L _b −L ₀ )] × 100

The outer packaging material 11 in the present embodiment is configured by using elastic sheets 12 and 13 having elasticity even if a plurality of elastic members in the form of threads or narrow bands are not fixed in an extended state (substantially in a natural state) Sheet without any wrinkles).
Examples of the elastic sheet include (1) a sheet in which stretchable fiber aggregates are integrated on both sides of an elastic fiber sheet composed of elastic fiber aggregates, and (2) at least one surface of a net-like elastic sheet. In addition, a sheet in which stretchable fiber aggregates are integrated in a natural state, and (3) an elastic nonwoven sheet composed only of an aggregate of elastic fibers are preferably used.
The plurality of stretchable sheets 12 and 13 may be formed from stretchable sheets having the same configuration, or may be formed from stretchable sheets having different configurations.

The sheet (1) will be described in detail.
Examples of the raw material for the elastic fiber sheet comprising an aggregate of elastic fibers include styrene butadiene styrene block copolymer (SBS), styrene isoprene styrene block copolymer (SIS), and styrene ethylene butylene styrene block copolymer (SEBS). Elastic raw materials such as styrene elastomers such as styrene ethylene propylene styrene block copolymer (SEPS), olefin elastomers, polyester elastomers and polyurethane elastomers can be used singly or in combination of two or more. As the elastic fiber sheet made of an aggregate of elastic fibers, for example, a material obtained by melting these elastic raw materials and forming a nonwoven fabric by a spunbond method, a melt blown method, or a spinning blown method is used.

Examples of stretchable fiber aggregates include fiber webs and non-woven fabrics produced by various manufacturing methods in which a number of slits extending in a specific direction are dispersed and formed so as to be stretchable in a direction perpendicular to the specific direction. .
Examples of a method for integrating the elastic fiber sheet and the extensible fiber aggregate include, for example, a method of laminating them and interlacing the fibers by hydroentanglement or the like, a part having a pattern using an adhesive, a heat roll, or the like. Examples include a method of bonding, and a method of bonding by thermal fusion of fiber intersections in a state where some of the constituent fibers of the non-elastic fiber layer have entered the elastic fiber layer.
By using such a sheet only on the outer surface of the diaper or on both the outer surface and the inner surface, it is possible to realize a disposable diaper that has good elongation, is soft like a cloth, is supple, and has a smooth touch. Further, the elastic fiber sheet preferably has fine fibers, and a spinning blow method is preferred as its production method.

The sheet (2) will be described in detail.
As the net-like elastic sheet, for example, a base-like sheet using elastic yarn as at least a weft, or a base-like sheet formed by arranging a large number of elastic bodies formed by slitting an elastic film in a base-like shape Is mentioned. As the stretchable fiber assembly, the same stretchable fiber assembly as in the sheet (1) can be used.
As a method for integrating the net-like elastic sheet and the extensible fiber assembly, the same method as the integration method in the sheet of (1) can be used.
By using a net-like elastic sheet as the elastic sheet, the strength of the outer surface is high, and the outer surface is not easily broken when the diaper is attached or detached. The net-like elastic sheet is preferably flat with no irregularities in terms of touch.

The sheet (3) will be described in detail.
As the sheet (3), an elastic nonwoven fabric sheet made of an aggregate of elastic fibers in the sheet (1) can be used. By using such a sheet, it is possible to realize a disposable diaper that has good elongation and is easy to put on.

  A plurality of waist elastic members 51, 51 are arranged along the opening peripheral edge of the waist opening at the peripheral edge 50 of the waist opening in each of the ventral side A and the back side B. These waist elastic members 51, 51 are fixed in an extended state between the two sheets 12, 13 via an adhesive 52. In addition, leg elastic members 61a and 61b are also provided along the peripheral edge of each opening on the peripheral edge 60 and 60 of the leg opening that exists across the ventral side A, crotch C and back side B. It is arranged. These leg elastic members 61 a and 61 b are fixed in an extended state between the two elastic sheets 12 and 13 via an adhesive 62. Elastic material such as natural rubber, polyurethane resin, foamed urethane resin, hot melt elastic member, etc. is formed into a thread (thread rubber) or a belt (flat rubber) for the waist elastic member and leg elastic member, respectively. What has been used is preferably used.

In the diaper 1 of the present embodiment, the elastic sheet 12 constituting the outer surface side of the outer packaging material 11 sandwiches the waist elastic members 51 and 51 by the two elastic sheets 12 and 13 as shown in FIG. It has a length that extends further than the portion to be fixed. And the part 12a, 12b extended rather than the elastic sheet 13 in the elastic sheet 12 is return | folded by the absorptive main body 10 side, as shown in FIG.
As for the absorptive main body 10, the skin contact surface side in the longitudinal direction both ends is covered with the folded parts 12a and 12b of the elastic sheet 12, and the covered parts are the folded parts 12a, It is bonded to 12b via an adhesive. By covering both longitudinal ends of the absorbent main body 10 with the stretchable sheet 12, it is possible to prevent the longitudinal end of the absorbent main body 10 from being turned over when the diaper 1 is put on or worn. .

  In the diaper 1 of this embodiment, as shown in FIG.3 and FIG.4, between the two elastic sheets 12 and 13 in each of the abdominal part A and the back part B is side seal part A1, A2. , B1 and B2 are bonded to each other by heat sealing, high frequency sealing or ultrasonic sealing, and the peripheral edge 50 of the waist opening 5 and the peripheral edge 60 of each of the pair of leg openings 6 are hot-melt adhesive. They are joined together by adhesives 52 and 62 such as agents.

Next, the absorbent main body 10 will be described in detail.
As shown in FIGS. 3 and 4, the absorbent main body 10 mainly covers the absorbent body 4, the surface sheet 2 that mainly covers the skin contact surface side of the absorbent body 4, and the non-skin contact surface side of the absorbent body 4. The back sheet 3 is provided. Each of the top sheet 2, the back sheet 3, and the absorber 4 has a rectangular plan view shape, and is integrated to form a vertically long absorbent main body 10. As the top sheet 2, a liquid-permeable sheet conventionally used for this type of diaper or the like can be used. As the back sheet 3, a liquid-impermeable or water-repellent sheet conventionally used for this type of diaper can be used.

  As shown in FIGS. 4 and 5, the absorbent body 4 includes a liquid-retaining absorbent core 41, a liquid-permeable covering sheet 42 that covers the absorbent core 41, and an elasticity for raising the absorbent body 4. And a member 45.

  The water absorbent core 41 is, for example, a fiber aggregate made of pulp fibers, continuous fibers (tow) or the like, or a fiber aggregate and a water absorbent polymer (mixed product of water absorbent polymer and fiber material). It is configured as a subject. Examples of the constituent fibers of the water absorbent core 41 include hydrophilic fibers such as pulp fibers, rayon fibers, cotton fibers, and cellulose acetate, polyolefin fibers such as polyethylene and polypropylene, and condensation fibers such as polyester and polyamide. Examples of water-absorbing polymers include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride) copolymer. Examples thereof include a polymer, a saponified product thereof, and polyaspartic acid. The constituent fibers and the water-absorbing polymer of the water-absorbent core 41 can be used singly or in combination of two or more.

  Examples of the covering sheet 42 include a sheet made of tissue paper or a liquid-permeable nonwoven fabric. The covering sheet 42 may be composed of a single sheet or may be composed of two or more sheets.

  As shown in FIGS. 4 and 5, the absorbent core 41 includes a plurality of core pieces 43 in which a portion C <b> 1 disposed in the crotch portion C is divided in the expansion / contraction direction (that is, the diaper width direction) of the outer packaging material 11. Become. As for the absorptive core 41 in the absorber 4 in this embodiment, the part C1 distribute | arranged to the crotch part C is comprised from the three core pieces 43. FIG. In the absorbent body 4, the elastic member 45 for starting up the outer part of the absorbent main body 10 (outer part of the side core piece 43 </ b> B) is stretched adjacent to the outer part of the side core piece 43 </ b> B and included in the covering sheet 42. It is arranged.

Next, the joining state between the absorbent main body 10 and the outer packaging material 11 will be described in detail.
Of the three core pieces 43 described above, the core piece 43 at the center in the width direction is referred to as “center core piece 43A”, and the core pieces 43 on both sides are referred to as “side core pieces 43B”. The portion having the central core piece 43A inside the thickness direction in the absorbent main body 10 is called a portion corresponding to the central core piece 43A (hereinafter also referred to as the central absorbent portion 10A), and the side core piece 43B is inside the thickness direction. The portion having the inter-core region inside the thickness direction is referred to as the portion corresponding to the side core piece 43B (hereinafter also referred to as the side absorbent portion 10B), and the portion corresponding to the inter-core region (hereinafter referred to as the inter-core portion). 10C).

FIG. 4 is a view showing a cross-section in the width direction of the diaper 1 in a state where the diaper 1 is unfolded and naturally contracted.
As shown in FIG. 4, the absorbent main body 10 in the present embodiment has at least a range from the one inter-core portion 10 </ b> C to the other inter-core region 10 </ b> C through the adhesive 15 in the diaper width direction. 11 is fixed. When a range from at least one inter-core portion 10C to the other inter-core region 10C is fixed to the outer packaging material 11, (a) one inter-core portion 10C and the other inter-core portion 10C are respectively outer packaging materials. (B) one side absorption part 10B and the other side absorption part 10B are fixed to the outer packaging material 11 respectively. Is included. The aspect of (a) and the aspect of (b) can be compatible.

  Here, the absorbent main body 10 is fixed to the outer packaging material 11 means that in the thickness direction of the diaper, the core piece 53 or a sheet substantially integrated with the core piece 53 (such as the covering sheet 42 described above). It means that the outer packaging material 11 is joined between all layers. The substantially integrated sheet is a sheet in which an interface with the core piece is bonded so as not to cause a deviation between the core piece 53 and a core so that no deviation occurs between the core piece 53 and the core piece 53. The sheet | seat which has wrapped the piece 53, etc. are mentioned. The method of joining the sheet so that there is no deviation between the core piece 53 is a method of joining the interface with the core piece with a solid-coated adhesive, or the interface with the core piece by spray coating, Examples include a method of bonding with an adhesive that has been substantially coated by spiral coating or the like.

  In the embodiment (a), (a1) one inter-core portion 10C and the other inter-core portion 10C are fixed to the outer packaging material 11, respectively, and the inter-core portions 10C, 10C in the absorbent main body 10 are fixed. When the gap is fixed to the outer packaging material 11 over its entire width, (a2) one inter-core portion 10C and the other inter-core portion 10C are fixed to the outer packaging material 11, respectively, and the absorbent main body 10, when the part between the cores 10 </ b> C and 10 </ b> C is partially fixed to the outer packaging material 11 (a <b> 3), one inter-core part 10 </ b> C and the other inter-core part 10 </ b> C are fixed to the outer packaging material 11, respectively. In the absorbent main body 10, the case where the space between the core portions 10C and 10C is not fixed to the outer packaging material 11 over the entire width thereof is included.

In the aspect of (b), (b1) one side absorbent part 10B and the other side absorbent part 10B are respectively fixed to the outer packaging material 11, and both the side absorbent parts 10B, When the space between 10B is fixed to the outer packaging material 11 over its entire width, (b2) one side absorption portion 10B and the other side absorption portion 10B are fixed to the outer packaging material 11 respectively, and the absorbency When the space between the two side absorption parts 10B, 10B in the main body 10 is partially fixed to the outer packaging material 11, (b3) one side absorption part 10B and the other side absorption part 10B are respectively included in the outer packaging material 11. Any of the case where the space between the two side absorbent parts 10B, 10B in the absorbent main body 10 is not fixed to the outer packaging material 11 over the entire width is included.
In the aspect of a1, a2, b1, and b2, it is preferable that at least a part of the central absorbent portion 10A is fixed to the outer packaging material 11.

The absorptive main body 10 in the diaper 1 of this embodiment is being fixed to the outer packaging material 11 of the state extended in the diaper width direction.
Therefore, as shown in FIG. 4, in the diaper 1 in a state of being expanded and contracted naturally (a state in which no external force is applied), the outer packaging material 11 is contracted in the diaper width direction, and in conjunction with the contraction. Primarily, the inter-core portion 10C of the absorbent main body 10 contracts in the width direction, and the width of the absorbent main body 10 in the crotch part C decreases. The absorptive main body 10 in the contracted state has a width at the crotch C that is narrower than a width at each of the abdominal side A and the back side B.
In the diaper 1 in the naturally contracted state before wearing, the width of the absorbent main body 10 is narrowed by the shrinkage of the outer packaging material 11 and the width of the crotch part C is also narrowed. It has a clean appearance with no bumps.
In addition, when putting on (or putting on) a diaper, the crotch part smoothly enters the wearer's crotch and is easy to wear. Further, even during wearing of the diaper, the groin of the diaper, particularly the portion along the leg circumference of the crotch C, is less likely to be bumpy and has a clean appearance.
Furthermore, when a force for extending the diaper in the width direction is applied during wearing or during wearing of the diaper, in the diaper 1 of the present embodiment, at least up to the elongation rate when the absorbent main body 10 is fixed, The outer packaging material 11 can be extended. For this reason, the outer packaging material 11 is not easily broken, and the absorbent main body 10 is not easily peeled from the outer packaging material 11.

Next, a preferable method for continuously producing the above-described pants-type disposable diaper 1 will be described with reference to FIG.
In the present embodiment, as the sheet for forming the outer packaging material 11, the first and second belt-like sheets 120 and 130 each having elasticity in the longitudinal direction are used.
As each of the 1st and 2nd strip | belt-shaped sheet | seats 130 and 130, the sheet | seat manufactured previously as a strip | belt-shaped sheet | seat which has a stretching property in a longitudinal direction outside a diaper manufacturing line can also be used. Prior to the step of extending the belt-like sheets 120 and 130 in the longitudinal direction, the non-stretchable belt-like sheet is subjected to processing for imparting stretchability, and the belt-like sheets exhibiting the stretchability are designated as the first and second belt-like sheets 120. , 130 can also be used.

  In the present embodiment, the first belt-like sheet 120 and the first belt-like sheet that are each fed out from a roll-shaped raw fabric or the like, or provided with elasticity on the upstream side from the step shown in FIG. 6 as described above. The sheet 130 is continuously conveyed to the joining portion G1 of the both, and the sheets 120 and 130 are bonded together at the joining portion G1.

  As shown in FIG. 6, the first belt-like sheet 120 and the second belt-like sheet 130 are bonded together with the leg elastic members 61a and 61b and the waist elastic member 51 sandwiched between the two sheets. Yes. Specifically, each of the belt-like sheets 120 and 130 is extended in the longitudinal direction between the front and rear rolls at two locations. The front and rear nip rolls (not shown) are each composed of a pair of rolls, and the rotational speeds (circumferential speed and sheet feed speed) of the pair of rolls constituting the rear nip roll are faster than the pair of rolls constituting the front nip roll. In this way, the speed difference and the belt-like sheets 120 and 130 are expanded. Then, both belt-like sheets 120 and 130 are conveyed to the nip roll 71 while maintaining the stretched state.

Before the two belt-like sheets 120 and 130 are overlaid, an adhesive for fixing the elastic member is applied to a predetermined part of one or both of the two belt-like sheets 120 and 130, and the elastic members are elastic. In a state where the members 61a, 61b, 51 are sandwiched in an extended state, the two belt-like sheets 120, 130 are narrowed by the nip roll 71 to fix the elastic members 61a, 61b, 51 and to join the two belt-like sheets 120, 130 together. To do. The leg elastic members 61a and 61b are introduced between the belt-like sheets while being swung by a known rocking guide in a direction perpendicular to the flow direction of the belt-like sheets 120 and 130.
By this bonding, a stretched outer packaging material continuous body 110 is obtained.

The stretched outer packaging material continuum 110 is conveyed to the merging portion G2 with the absorbent main body 10 while maintaining the stretched state, and the above-described outer packaging material continuum 110 is maintained on the outer packaging material continuum 110 while maintaining the stretched state. The absorbent main body 10 having the configuration is intermittently bonded and fixed.
And according to a conventional method, the trim 110 for leg opening formation is removed with a rotary cutter, a laser cutter, etc., and the diaper continuous body 100 is obtained.
Next, the both side portions 12a and 12b of the outer packaging material continuous body 110 in the diaper continuous body 100 are folded back so as to cover both end portions of the absorbent main body 10, and the both end portions are fixed.
Next, when passing through the nip roll 74, the degree of extension of the outer packaging material continuous body 110 is slightly weakened, then the diaper continuous body 100 is folded in half, and then the side seal portions S and S are heat sealed, ultrasonic sealed, The pants-type disposable diaper 1 can be obtained by cutting into individual diapers after being formed by a high-frequency seal or the like or simultaneously with forming the side seal portions S and S.

  The point which does not explain especially the manufacturing method mentioned above can be performed similarly to the manufacturing method of the conventional so-called cross-flow type pants-type disposable diaper. The adhesive 15 for fixing the absorbent main body 10 to the outer packaging material continuous body 110 can be applied to either or both of the absorbent main body 10 and the outer packaging material continuous body 110. The trim 111 for forming the leg opening can be removed before the absorbent main body 10 is fixed.

L1 to L4 in FIG. 6 respectively indicate lengths corresponding to the full width of one diaper at each stage of the manufacturing process. L4 has shown the dimension of the diaper width direction in the state which developed the diaper and contracted naturally.
The elongation rate of the outer packaging material continuum (outer packaging material) 110 when fixing the absorbent main body 10 (elongation rate based on the length L4, ie, (L2 / L4) × 100) is 130 to 300%. It is preferable that there is, more preferably 140 to 280%, still more preferably 150 to 270%.

  Further, the elongation rate of the outer packaging material continuum (outer packaging material) 110 when the abdominal side A and the back side B of the outer packaging material continuum (outer packaging material) 110 are overlapped (the elongation rate based on the length L4, That is, (L3 / L4) × 100) is preferably 130 to 300%, more preferably 140 to 280%, and still more preferably 150 to 270%.

  According to this embodiment, the above-described pants-type disposable diaper can be efficiently and continuously produced in this manner.

  Hereinafter, other embodiments of the pant-type absorbent article of the present invention will be described. About these embodiment, a different point from the diaper 1 mentioned above is demonstrated, and description is abbreviate | omitted about the same point. About the point which is not demonstrated especially, the description about the diaper 1 mentioned above is applied suitably. In addition, the same code | symbol is attached | subjected to the same member.

  In the pants-type disposable diaper according to another embodiment of the present invention, a stretchable belt-like sheet that becomes the sheet 12 on the non-skin contact surface side of the two sheets 12 and 13 constituting the outer packaging material at the time of manufacture. While the belt 120 is stretched in the flow direction, the belt-like sheet 130 that becomes the sheet 13 on the skin contact surface side of the two sheets 12 and 13 is not substantially stretched or has a lower stretch rate than the belt-like sheet 120 ( For example, both belt-like sheets 120 and 130 are joined to form a continuous outer packaging material 110 in a state of being stretched only to a stretching ratio of 1/2 or less. And the absorptive main body 10 is intermittently fixed on the outer packaging material continuous body 110, maintaining the expansion | extension state of the strip | belt-shaped sheet | seat 120. FIG.

  In the diaper of this embodiment, the contraction force of the sheet 13 on the skin contact surface side made of an elastic sheet is transmitted to the absorbent main body 10 so that the inter-core portion 10C of the absorbent main body 10 in the natural state contracts. The two sheets 12 and 13 constituting the outer packaging material 11 are joined to each other. The effect similar to the said diaper 1 is show | played when the part 10C between cores of the absorptive main body 10 in a diaper expands / contracts. The portion where the two sheets constituting the outer packaging material are joined is only required to shrink the inter-core portion 10C of the absorbent main body 10, and the entire area in the width direction of the crotch portion is applied to the entire surface, or in the form of dots or spirals. May be joined by applying a curved or lattice pattern such as Ω or Ω, or may be joined at a plurality of locations spaced apart in the width direction of the crotch, for example, at the locations of the plurality of side core pieces 43A and 43B. Moreover, as joining means, arbitrary methods, such as adhesives, such as hot melt, embossing, an ultrasonic wave, and a heat seal, can be used, for example.

  In this embodiment, the sheet 13 (band-like sheet 130) on the skin contact surface side of the two sheets 12, 13 constituting the outer packaging material may be a stretchable sheet as with the diaper 1. Further, it may be a sheet having extensibility but not elasticity, or a sheet having neither elasticity nor extensibility. However, non-extensible nonwoven fabrics such as a spunbond nonwoven fabric, an air-through nonwoven fabric, a heat roll nonwoven fabric, and a spunlace nonwoven fabric are preferable in terms of texture, cost, and strength.

In the diaper shown in FIG. 7A, both end portions in the longitudinal direction of the absorbent main body 10 (only one end is shown) are covered with a sheet material 8 </ b> A separate from the stretchable sheet 12. The sheet material 8A extends over the entire width of the diaper in the width direction. In addition, the sheet material 8A is fixed to the side seal portions A1 and A2 at both ends of the diaper width direction, and the portion overlapped with the absorbent main body 10 is also fixed on the absorbent main body 10 with an adhesive. The entire one surface of the sheet material 8A can be fixed on the outer packaging material 11 on which the absorbent main body 10 is arranged.
The diaper shown in FIG. 7 (a) is obtained by replacing the both side portions of the elastic sheet 12 with the skin contact surface side of the absorbent main body in the manufacturing method of the diaper 1 described above, and two strip-shaped sheet materials. 8A is introduced so that a part thereof overlaps both ends in the longitudinal direction of the absorbent main body 10, and a portion of the sheet material 8A overlapping the absorbent main body 10 is bonded and fixed on the absorbent main body 10. Can be obtained.

In the diaper shown in FIG. 7B, both end portions in the longitudinal direction of the absorbent main body 10 (only one end is shown) are covered with a sheet material 8B separate from the elastic sheet 12.
The sheet material 8 </ b> B has a width that is slightly wider than the width of the absorbent main body 10, and covers a portion overlapped with the absorbent main body 10 and its periphery. The entire sheet material 8B is fixed on the outer packaging material 11 on which the absorbent main body 10 is disposed.
The diaper shown in FIG. 7B is a method of manufacturing the diaper 1 described above. Instead of turning both side portions of the elastic sheet 12 back to the skin contact surface side of the absorbent main body, a strip-shaped sheet material 8B is used. The sheet material 8B is intermittently introduced so as to be overlapped on both ends in the longitudinal direction of the absorbent main body 10, and the entire surface of the sheet material 8B is bonded and fixed to the opposite surface.

In the above-described embodiment, the sheet materials 8A and 8B are fixed to the extended outer packaging material 11 (outer packaging material continuous body 110). Therefore, even if the diaper expands or contracts during the manufacturing process of the diaper or when the diaper is worn, the sheet materials 8A and 8B spread smoothly in the length when the wrapping material 11 is fixed to the outer packaging material 11. Therefore, the sheet material 8A, 8B does not peel off or break.
Therefore, as these sheet materials 8A and 8B, in addition to a sheet having stretchability and a sheet having stretchability, those having substantially neither stretchability nor stretchability can be used.
As a material used as these sheet materials, a resin film, a nonwoven fabric, a laminate of a resin film and a nonwoven fabric, etc. by various manufacturing methods can be used.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to each embodiment mentioned above, It can change suitably.
For example, the pant-type absorbent article in the present invention may be a pant-type (including what is called a shorts-type) sanitary napkin.

  Further, the absorbent body (or absorbent core) used in the present invention may be as shown in FIG. In FIG. 8, the code | symbol 42 is the tissue paper (mounting paper) which coat | covers the skin contact surface side and the non-skin contact surface side of the absorptive core 41, and each absorber 4 shown in FIG. The part which covers the skin contact surface side is removed and shown. The central core piece 43A preferably has a multilayer structure. For example, in FIG. 8C, the central core piece 43A has a two-layer structure including an upper layer 41c and a lower layer 41d. Similarly, the central core piece 43A shown in FIGS. 8A and 8B can have a multilayer structure such as a two-layer structure.

The continuous outer packaging material 110 in the stretched state in the manufacturing method of the present invention is conveyed to the nip roll 71 in a state where the first belt-like sheet 120 and the second belt-like sheet 130 are not stretched, and the nip roll 71 bonds the both sheets together. It may be elongated.
For example, the sheets 120 and 130 can be bonded and stretched after the bonding as follows.
First, before the two belt-like sheets 120 and 130 are overlapped, an adhesive for fixing the elastic member is applied to a predetermined portion of one or both of the two belt-like sheets 120 and 130 facing each other. In a state where the elastic members 61a, 61b, 51 are sandwiched in an extended state, the two belt-like sheets 120, 130 are narrowed by the nip roll 71 to fix the elastic members 61a, 61b, 51 and between the two belt-like sheets 120, 130. Join.
By this bonding, a stretched outer packaging material continuous body 110 is obtained.
Next, the outer wrapping material continuous body 110 is extended in the longitudinal direction between the first nip roll 72 and the second nip roll 73 while being continuously conveyed. The first and second nip rolls 72 and 73 are each composed of a pair of rolls, and the rotational speeds of the pair of rolls constituting the second nip roll 73 (peripheral speed, sheet thickness) rather than the pair of rolls constituting the first nip roll 72. It is driven to increase the feed speed), and the speed difference and the outer packaging material continuous body 110 can be extended. In the embodiment described above, L2 = L1 in FIG. 6 is satisfied, but in this embodiment, L2> L1.

FIG. 1 is a perspective view showing a pants-type disposable diaper which is an embodiment of a pants-type absorbent article of the present invention. FIG. 2 is a plan view showing a developed state of the diaper shown in FIG. FIG. 3 is an exploded perspective view of the diaper shown in FIG. 4 is a cross-sectional view taken along the line II-II of FIG. 2 in a state in which the diaper shown in FIG. 1 is naturally contracted. 5A and 5B are diagrams showing an absorber used in the diaper shown in FIG. 1, in which FIG. 5A is a plan view and FIG. 5B is a sectional view taken along line III-III in FIG. FIG. 6 is a schematic perspective view showing an outline of a preferable manufacturing method of the pants-type disposable diaper shown in FIG. 1. Fig.7 (a) and FIG.7 (c) are each a top view which shows the skin contact surface side of the diaper belly side part in the diaper of other embodiment of this invention. Fig.8 (a)-FIG.8 (c) are each a top view which shows the other example of the absorber or absorbent core preferably used for the underpants type absorbent article of this invention.

Explanation of symbols

1 Pants-type disposable diapers (pants-type absorbent articles)
2 Top sheet 3 Back sheet 4 Absorber 41 Absorbent core 43 Core piece 43A Central core piece (core piece)
43B Side core piece (core piece)
44 Inter-core region 10 Absorbent body 10C Inter-core portion (corresponding to inter-core region)
DESCRIPTION OF SYMBOLS 11 Outer packaging material 12 Sheet | seat which comprises the non-skin contact surface side of outer packaging material 13 Sheet | seat which comprises the skin contact surface side of outer packaging material

Claims (6)

A pants-type absorbent article comprising an absorbent main body including an absorbent core and an outer packaging material disposed on the non-skin contact surface side of the absorbent main body,
The absorbent core is composed of a plurality of core pieces divided at least in the width direction at least in the crotch part,
The outer packaging material is formed using an elastic sheet,
A pants-type absorbent article formed by fixing the absorbent main body to the outer packaging material in a state where the absorbent body is extended in the width direction of the absorbent article.   The absorbent core includes a central core piece located in the center of the absorbent article in the width direction, a pair of side core pieces located on both sides of the absorbent core, and a pair of side core pieces between the central core piece and the pair of side core pieces. An area between the cores, and at least a range of the absorbent main body from a portion corresponding to one inter-core region to a portion corresponding to the other inter-core region is fixed to the outer packaging material. The underpants type absorbent article as described.   The pants-type absorbent article according to claim 1 or 2, wherein the outer packaging material is composed of two sheets, and the sheet on the non-skin contact surface side of the two sheets is the stretchable sheet.   The pants-type absorbent article according to claim 3, wherein the skin contact surface side of the two sheets is also an elastic sheet.   The two sheets constituting the outer packaging material are the same as the sheet on the skin contact surface side and the adhesive or heat in a state where the stretchable sheet on the non-skin contact surface side is extended in the width direction of the absorbent article. The underpants-type absorbent article according to claim 3, which is obtained by bonding with a pellicle. It is a manufacturing method of the underpants type absorbent article according to claim 1,
The outer packaging material has a configuration in which the outer packaging material is continuous in a strip shape, and the absorbent main body is intermittently fixed to the outer packaging material continuous body that is conveyed in a longitudinal direction to obtain an absorbent article continuous body. Process,
The manufacturing method of the underpants type absorbent article which comprises the process of forming the side seal part after cutting the absorbent article continuous body in two, cutting it, and separating it into individual absorbent articles.

Images