JP2008148875A - Method of manufacturing pants type absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of efficiently and continuously manufacturing a pants type absorbent article which is excellent in an appearance and a wearing feeling and is high in finish accuracy. <P>SOLUTION: This method comprises: a process of fixing a girth part elastic member 71 between a belt-like base material sheet 140 and an elastic member fixing sheet 150 and obtaining an inner layer sheet continuous body 130 having a flexible part 17; a process of joining outer layer sheet continuous bodies 120a and 120b composed of a belt-like flexible sheet to the inner layer sheet continuous body 130 in a stretched state and obtaining an exterior material continuous body 110 for which the flexible part 17 of the inner layer sheet continuous body 130 and the outer layer sheet continuous bodies 120a and 120b are not joined at least partially; a process of fixing an absorbent main body 10 to the exterior material continuous body 110 and obtaining an absorbent article continuous body 100; and a process of folding the absorbent article continuous body 100 into two, then forming a side sealing part S, cutting it and separating it into individual pants type absorbent articles 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a pant-type absorbent article.

Conventionally, as a pants-type absorbent article, a disposable diaper including an absorbent main body including an absorbent core and an exterior material disposed on the non-skin contact surface side of the absorbent main body is known.
Further, by fixing an elastic member that gives elastic stretchability to the waist part of the diaper in a stretched state to a member other than the outermost layer sheet located on the outer surface of the diaper, the gathers due to the contraction of the elastic member can be removed from the diaper. A disposable diaper that is not formed on the surface has been proposed (see Patent Document 1).

JP 11-4853 A

Since the disposable diaper described in Patent Document 1 does not have gathers on the outer surface, it gives a clean appearance, but only the portion where the elastic member is fixed in the member arranged inside the outer layer sheet. However, there is room for improvement in terms of difficulty in slippage and fit.
Moreover, the elastic sheet obtained by the method which does not form a gather is known as a material used for clothes. If an exterior material of a pants-type diaper is formed with such a non-gather type stretchable sheet, no gathers are formed on the outer surface, so that the appearance is clean.
However, it is difficult to obtain the optimal stretchability with only the stretchable sheet. For example, when it is desired to partially enhance the stretchability of the exterior material for the purpose of improving the wearability, the stretchable sheet is partially stretchable. It is necessary to perform a process for changing the manufacturing process, which leads to a complicated manufacturing process and an increase in manufacturing cost.

  In addition, using such non-gather type stretchable sheets, disposable diapers are manufactured especially by the so-called cross-flow method (a method in which a diaper is manufactured through a continuous diaper configured in the width direction of the diaper). In this case, the sheet is stretched due to the tension applied to the sheet during conveyance, and the amount of elongation varies with the variation in tension. Therefore, the joining position of the absorbent main body to the sheet and the leg hole to the sheet A stable production of pant-type disposable diapers with high finishing accuracy, which is likely to shift in the formation position of the sheet, the folding position when the sheet is folded in two, and the sealing position when sealing a predetermined portion of the folded sheet Difficult to do.

  Accordingly, an object of the present invention is to provide a method for producing a pant-type absorbent article that is capable of efficiently and continuously producing a pant-type absorbent article having excellent appearance and wearing feeling and high finishing accuracy.

  The present invention comprises an absorbent main body and an exterior material, and the exterior material has an outer layer sheet made of a stretchable sheet and an inner layer sheet disposed on the absorbent body side of the outer layer sheet. And an elastic part formed by fixing a waist part elastic member between the base sheet and the elastic member fixing sheet, and the exterior body has a space between the elastic part of the inner layer sheet and the outer layer sheet. A method for producing a pant-type absorbent article having a non-joined part that is not joined, wherein the waistline elastic member is fixed between a belt-like base sheet and an elastic member fixing sheet, and the elastic part is provided. A step of obtaining an inner layer sheet continuous body, an outer layer sheet continuous body composed of a belt-shaped elastic sheet is joined to the inner layer sheet continuous body in an expanded state, and the stretchable portion of the inner layer sheet continuous body and the outer layer sheet continuous body, Is at least partially joined A step of obtaining an outer packaging material continuous body, a step of obtaining an absorbent article continuous body by fixing an absorbent main body to the exterior material continuous body, and a side seal portion after folding the absorbent article continuous body in two The object is achieved by providing a method for producing a pant-type absorbent article comprising the steps of forming, cutting and separating into individual pant-type absorbent articles.

  According to the method for producing a pant-type absorbent article of the present invention, a pant-type absorbent article having excellent appearance and wearing feeling and high finishing accuracy can be stably and continuously produced.

The present invention will be described below based on preferred embodiments with reference to the drawings.
First, an example of a pants-type absorbent article manufactured according to the present invention will be described.

  A pants-type disposable diaper 1 (hereinafter also referred to as diaper 1) shown in FIG. 1 is an example of a pants-type absorbent article produced according to the present invention. As shown in FIG. 3, a liquid-permeable topsheet 2, A substantially vertically long absorbent main body 10 having a liquid impervious or liquid impervious (water repellency, etc.) back sheet 3 and a liquid retaining absorbent core 4 interposed between both sheets 2 and 3; And the exterior material 11 arranged on the back sheet 3 side (non-skin contact surface side) of the absorbent main body 10.

  As shown in FIG. 2, the diaper 1 is positioned between the abdominal side A disposed on the wearer's abdomen and the dorsal side B disposed on the dorsal side during wearing in the longitudinal direction in the deployed state. It is divided into the crotch part C. The exterior material 11 has defined the outline of a diaper, and the unfolded state WHEREIN: The both-sides edge has the shape of the hourglass shape which was bound inward in the longitudinal direction center part. In the exterior 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 a pair of side seal portions S is attached to the diaper 1 by the joining. , S, a waist opening 5 and a pair of leg openings 6 and 6 are formed.

  The absorbent main body 10 is formed by integrating the top sheet 2, the back sheet 3, and the absorbent core 4. 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 front sheet, a resin film or a laminate of the nonwoven fabric and the nonwoven fabric can be used as the back sheet, and the absorbent core 4 has high absorbency. A material composed of polymer particles and a fiber material and covered with tissue paper (not shown) can be used.

  In the present diaper 1, 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. ing. In the vicinity of the free end of each side cuff 8, a plurality of side cuff elastic members 8a are arranged in an expanded state. The side cuff 8 stands up when the diaper is worn to prevent the liquid from flowing out. In FIG. 3, a sheet material for forming the side cuffs 8 and 8 is indicated by reference numeral 82. The portions 82 </ b> S that extend outward from both side edges of the absorbent core 4 in the sheet material 82 are fixed between the absorbent core 4 and the backsheet 3 or between the backsheet 3 and the inner layer sheet 13. Yes.

The exterior material 11 includes an outer layer sheet 12 made of a stretchable sheet and an inner layer sheet 13 disposed on the absorbent main body 10 side of the outer layer sheet 12.
As shown in FIG. 3, the outer layer sheet 12 in the diaper 1 is divided into an abdominal outer layer sheet 12A located on the abdominal side A side and a back outer layer sheet 12B located on the back side B side. The seat 13 is continuous over the abdomen A, the crotch C, and the dorsal B.
Each of the ventral outer layer sheet 12A and the back outer layer sheet 12B and the inner layer sheet 13 are laminated together. The ventral outer layer sheet 12A and the dorsal outer layer sheet 12B form the outer surface of the diaper 1 in the ventral part A and the dorsal side B.

As shown in FIG. 3, the inner layer sheet 13 has a structure in which a base sheet 14 and two elastic member fixing sheets 15 are laminated. The two elastic member fixing sheets 15 are fixed to the absorptive body 10 side (skin contact surface side) surface of the base sheet 14 in the abdominal side A and the back side B via an adhesive 72. .
Further, a waistline elastic member 71 is fixed between the base sheet 14 and each of the two elastic member fixing sheets 15. The waistline elastic member 71 in the present diaper 1 is cut at the center part in the diaper width direction in each of the abdominal side part A and the back side part B and divided into left and right sides, as shown in FIG. Stretchable portions 17, 17 that extend and contract in the diaper width direction are formed on the left and right sides of the inner layer sheet 13 in each of the part A and the back side part B, and the width of the inner layer sheet 13 in each of the ventral side part A and the back side part B A central portion in the direction is a non-stretchable portion 18.

The expansion / contraction portions 17 and 17 of the inner layer sheet 13 are generally called gathers, and the elastic member 71 fixed in an expanded state contracts to the base sheet 14 and / or the elastic member fixing sheet 15 to generate a relatively large wrinkle. Occurs.
The waistline elastic member 71 is disposed on the waistline 70 of the diaper 1. The waist part 70 is a part below the waist part elastic member 51 and above the upper end part of the leg opening. When the waist elastic member 51 and the waistline elastic member 71 cannot be distinguished from each other by their form, stretchable characteristics, etc., the distance from the opening peripheral edge 53 of the waist opening in the longitudinal direction of the diaper (absorbent article) is 3 cm. To around 12 cm is a waistline elastic member 71.

The base sheet 14 is made of a non-extensible sheet, and the outer layer sheet 13 is made of an elastic sheet.
“Non-extensible sheet” has a maximum elongation of 10% or less (length up to 1.1 times) at least in the same direction as the width direction of the diaper (absorbent article) (left-right direction in FIG. 2). Preferably). The non-extensible sheet preferably has a maximum elongation in the longitudinal direction (same as the machine direction) of 10% or less in the state of the strip-shaped base sheet 140 used at the time of production, and the longitudinal direction and the direction orthogonal thereto The maximum elongation in both directions is preferably 10% or less.
The “stretchable sheet” has a maximum elongation of at least 100% in the same direction as the width direction (the left-right direction in FIG. 2) of the diaper (absorbent article) and is stretched to 100% in that direction. After that, the stretch recovery rate when contracted (elongation recovery rate at 100% stretch) is 70% or more, from the point that the stretch is sufficient to improve the wearability, and the fit is improved. preferable. The stretchable sheet has a maximum elongation of 100% or more in the longitudinal direction (the same as the machine direction) in the state of the belt-like outer layer sheet continuous body 120a, 120b used during production, and an elongation recovery rate in the direction of 70% or more. It is preferable that

[Measurement method of maximum elongation]
A sample piece having the same dimensions as the sample piece used in the method for measuring the elongation recovery rate described later is stretched under the same conditions, and the elongation at the time of fracture is defined as the maximum elongation. The point of time when the fracture occurs is a point at which the tensile load shows the maximum value in the relationship curve between the elongation rate and the load.

  The stretchable sheet used for the diaper 1 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 expands greatly and contracts after expansion (maximum elongation of 100% or more and elongation recovery rate of 100% or more at 100% elongation), but slightly in the diaper longitudinal direction. However, it only stretches (for example, a 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 having a length of 50 mm and a width of 25 mm is prepared. Using a Tensilon device, the sample piece is fixed at the chuck interval L0, and the length L2 at the time of 100% elongation at a speed of 300 mm / min (L2 = L0 × 2) Then, the length of the sample piece when the tensile load becomes 0 after starting to return at the same speed as the tensile speed is defined as the length L1 after the elongation recovery. The elongation recovery rate at 100% elongation is calculated from the following equation.
Elongation recovery rate at 100% elongation (%) = [(L2-L1) / (L2-L0)] × 100

The outer layer sheet 12 in the diaper 1 is made of an elastic sheet.
The elastic sheet is different from a non-extensible sheet in which gathers are formed by fixing a plurality of elastic members in the form of threads or strips in a stretched state, and the gathers are not substantially formed in a natural state.
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. A sheet in which stretchable fiber aggregates are integrated in a natural state, (3) an elastic nonwoven sheet composed only of elastic fiber aggregates, and (4) a mixed aggregate of elastic fibers and stretchable fibers. The sheet formed is preferably used.

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 the method of integrating the elastic fiber sheet and the extensible fiber aggregate include, for example, a method of laminating them and tangling the fibers by hydroentanglement or the like, a part having a pattern using an adhesive, a heat roll, 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. The elastic fiber sheet preferably has fine fibers, and the spinning method is preferred as its production method.

The sheet (2) will be described in detail.
As a net-like elastic sheet, for example, a base-like sheet using elastic yarn as at least a weft, or a base-like sheet having 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.

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.

As shown in FIG. 3, the ventral outer layer sheet 12 </ b> A and the back outer layer sheet 12 </ b> B are joined via the inner layer sheet 13 and the adhesive 16 only at the respective peripheral edges, as shown in FIGS. 4 and 5. Further, in the portion 73 where the waistline elastic member 71 is arranged in the longitudinal direction of the diaper 1, the inner layer sheet 13 and the outer layer sheet 12 are joined except for the side seal portion S and a part of the vicinity thereof. It has not been. That is, most of the stretchable portion 17 of the inner layer sheet 13 is not joined to the outer layer sheet 12. In the diaper 1, most of the portion including the portion 74 where the elastic member fixing sheet 15 is disposed in the outer package 11 and the portion 73 is between the stretchable portion 17 of the inner layer sheet 13 and the outer layer sheet 12. Is a non-joined part that is not joined. The stretchable portion 17 of the inner layer sheet 13 is a portion of 50% or more of its area from the viewpoint of suppressing the occurrence of wrinkles due to the stretchable action of the inner layer sheet from the viewpoint of appearance without impairing the physical properties of the stretchable outer layer sheet. Is preferably not joined to the outer layer sheet 12, and more preferably 80% or more of the part is not joined to the outer layer sheet 12.
In addition, the vertical direction of a diaper (absorbent article) is a direction orthogonal to the width direction of a diaper (absorbent article), and is the up-down direction in FIG.2 and FIG.4.

  In the diaper 1, the outer layer sheet 12 and the inner layer sheet 13 in the portion 73 are not damaged from the physical properties of the outer layer sheet having elasticity, and also from the viewpoint of suppressing the generation of wrinkles due to the stretching action of the inner layer sheet. Is preferably not joined in a region more than half of the range in which the elastic member 51 is disposed in the diaper width direction of the ventral side A and / or the back side B, excluding the vicinity of the side seal portion It is preferable that it is not joined in the substantially whole area. Moreover, the range in which both the sheets 12 and 13 are not joined can be made different between the ventral portion A and the dorsal portion B.

A plurality of waist elastic members 51, 51 are arranged along the opening peripheral edge 53 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. In addition, the leg portions 60 and 60 of the leg opening portion along the crotch C side of the ventral side portion A and the back side portion B forming the rec opening portion are also provided along the peripheral edge of each opening portion. Elastic members 61a and 61b are arranged.
As the waist elastic member, the waistline elastic member, and the leg elastic member, elastic materials such as natural rubber, polyurethane-based resin, urethane foam-based resin, and hot-melt-type elastic members are each formed into a thread shape (thread rubber) or a band shape ( A flat rubber is preferably used.

As shown in FIGS. 4 and 5, the waist elastic member 51 is fixed to the absorptive main body side of the inner layer sheet 13 by an adhesive 52 or the like in each of the abdominal side A and the back side B. . More specifically, the waist elastic member 51 includes an adhesive 52 and the like between the inner layer sheet 13 and the extended portion 13a of the inner layer sheet 13 folded back to the inner surface side of the diaper at the opening peripheral edge 53 of the waist opening. It is fixed by joining.
The fact that the waistline elastic member 71 and the elastic member fixing sheet 15 are fixed to the absorbent main body 10 side of the base sheet 14 prevents the elastic member 71 from directly touching the wearer and the diaper displacement. It is preferable from the viewpoint of effectively preventing the drop. Moreover, it is preferable to arrange | position the waist part elastic member 71 about 2-12 each to the stomach side part A and the back side part B, for example. The elastic member 71 divided into the left and right as in the present embodiment is counted as one by combining the left and right two. The number of the waistline elastic members 71 may be different between the abdominal side A and the back side B.

The leg elastic members 61a and 61b are fixed in an extended state between the outer layer sheet 12 and the inner layer sheet 13 by an adhesive 16 or the like.
In the diaper 1, the cross section shown in FIG. 3 or 4 on the abdomen side is substantially the same as the cross section on the back side at the same position in the diaper width direction. In FIG. 3, reference numerals of corresponding members appearing in the cross section on the dorsal side are shown in parentheses.

  In the diaper 1, the outer layer sheet 12 constituting the outer surface side of the exterior material 11 and the inner layer sheet 13 disposed on the inner side thereof are respectively at the opening peripheral edge 53 of the waist opening 5, as shown in FIGS. 3 and 4. The diaper 1 has extended portions 12a, 12b, 13a, and 13b that are folded back on the inner surface side. The length L2 (the length from the opening peripheral edge 53, see FIG. 5) of the non-extensible extended portions 13a and 13b of the inner layer sheet 13 folded is the stretched extended portion of the outer layer sheet 12 folded. It is preferable to be longer than the length L1 of 12a, 12b (length from the opening peripheral edge 53, see FIG. 5). As for the absorptive main body 10, the skin contact surface side in the longitudinal direction both ends is covered with the extension parts 13a and 13b of the non-extensible inner layer sheet 13, and the covered part is the extension part 13a. , 13b is bonded through an adhesive 19.

Next, an embodiment of the method for producing a pant-type absorbent article of the present invention will be described with reference to FIG. 6 by taking as an example the case of continuously producing the diaper 1 described above.
In the present embodiment, as shown in FIG. 6, a plurality of thread-like waistline elastic members 71 and two belt-like elastic member fixing sheets 150 and 150 are provided on a belt-like base material sheet 140 that is continuously conveyed. The waistline elastic member 71 is introduced in an extended state between each elastic member fixing sheet 150 and the base sheet 140. Prior to this introduction, an adhesive is applied to the base sheet 140 and / or the elastic member fixing sheet 150 by a known adhesive application device 80. In the present embodiment, the application of the adhesive is intermittently applied so that the application part and the non-application part of the adhesive are alternately formed. The strip-shaped base sheet 140 preferably has a maximum elongation in the longitudinal direction of 10% or less. In the present embodiment, a sheet having a maximum elongation of 10% or less in both the longitudinal direction and the width direction is used. As the base material sheet 140 and the elastic member fixing sheet 150, a nonwoven fabric, a laminate of a nonwoven fabric and a resin film, a woven fabric, or the like can be used.
Next, the two sheets 140 and 150 in a state where the elastic member 71 is sandwiched are narrowed by the nip roll 81, and the two are adhered and integrated at the adhesive application portion. In this way, the inner layer sheet continuous body 130 is obtained.
Next, the inner layer sheet continuous body 130 is introduced between the pair of rolls 83 and 84 of the precut device 82, and the elastic member 71 is cut at the non-applied portion of the adhesive.

And the two outer layer sheet | seat continuous bodies 120a and 120b which each consist of a strip-shaped elastic sheet are joined to the inner layer sheet | seat continuous body 130 in the expansion | extension state.
As the outer layer sheet continuous body 120a, 120b, an elastic sheet manufactured in advance as a belt-like sheet having elasticity in the longitudinal direction outside the diaper production line can also be used. In the present embodiment, FIG. As shown, before extending the outer layer sheet continuous body 120a, 120b in the longitudinal direction, the non-stretchable belt-like sheet 120 ′ is processed to obtain a stretchable sheet exhibiting stretchability or a low-stretch belt-like shape. The sheet 120 ′ is processed to obtain a belt-like stretchable sheet with improved stretchability.

  In the present embodiment, as shown in FIG. 6, the process of causing the non-stretchable belt-like sheet 120 ′ to exhibit stretchability or the process of improving the stretchability of the low-stretchable belt-like sheet 120 ′ includes teeth and grooves. This is an in-line process using a pair of tooth gap rolls 85 engaged with each other. Specifically, the belt-like sheet 120 ′ in which the non-elastic fiber layer is integrated on both sides or one side of the elastic layer made of an elastic fiber layer, a net-like elastic sheet, an elastic film or the like is bitten by the pair of tooth gap rolls 85. Therefore, the non-elastic fiber layer can be divided, the constituent fibers can be stretched, or the heat-sealing points between the fibers can be destroyed to change the structure so that the elastic layer does not hinder expansion and contraction. Yes. By changing the non-elastic fiber layer to a structure that hardly inhibits the expansion and contraction of the elastic layer, a stretchable sheet that exhibits or improves stretchability is obtained.

In the present embodiment, two stretchable sheets are used as the outer layer sheet continuous bodies 120a and 120b. In any case, it is preferable that the maximum elongation in the longitudinal direction is 100% or more and the elongation recovery rate at 100% elongation is 70% or more.
As shown in FIG. 6, these outer layer sheet continuous bodies 120a and 120b are stretched between the first nip roll 86 and the second nip roll 87, respectively, while being transported with a gap therebetween, and the stretched state. Is maintained to the merging portion (nip roll 88) G1 with the inner layer sheet continuous body 130.
The first and second nip rolls 86 and 87 are each composed of a pair of rolls, and the rotational speed (peripheral speed, sheet feeding speed) of the pair of second nip rolls 87 is higher than the pair of rolls of the first nip roll 86. Driven to be faster, the speed difference, outer layer continuous sheet 120a, 120b is extended. The outer layer sheet continuums 120a and 120b are preferably joined to the inner layer sheet continuum 130 in a state of being stretched to an elongation of about 70 to 150%.

In the merging portion G1, the outer layer sheet continuums 120a and 120b and the inner layer sheet continuum 130 are clamped by the nip roll 88 with the leg elastic members 61a and 61b interposed therebetween. Prior to the narrow pressure by the nip roll 88, an adhesive is applied in a predetermined pattern to the outer layer sheet continuums 120a and 120b and / or the inner layer sheet continuum 130 using a known adhesive application device 91. As shown in FIG. 3, the application of the adhesive 16 is performed so that the application part and the non-application part of the adhesive are alternately generated in the flow direction, and the expansion / contraction part (elastic member 71) of the inner layer sheet continuous body 130 is formed. Is performed such that at least a part is not adhered between each of the outer layer sheet continuous bodies 120a and 120b.

The outer layer continuous sheet 120a, 120b, the inner layer continuous sheet 130, and the elastic members 61a, 61b are integrated by the sandwiching pressure by the nip roll 88, and the exterior material continuous body 110 is obtained. The outer layer sheet continuous bodies 120a and 120b when they are integrated are in an extended state, and the belt-shaped base sheet 140 is in a slightly extended state. When joining the outer layer continuous sheets 120a and 120b to the inner layer continuous sheet 130, the waistline elastic member 71 sandwiched between the base sheet 140 and the elastic member fixing sheet 150 is in an extended state.
The leg elastic members 61a and 61b are introduced between the outer layer sheet continuums 120a and 120b and the inner layer sheet continuum 130 while being moved by a known slide guide. The introduced leg elastic members 61 a and 61 b are fixed between the outer layer sheet continuous body 120 and the inner layer sheet continuous body 130 via the adhesive 16, and by the precut roll 89, the width direction of the crotch part of the diaper It is cut at the site located in the center.

  The exterior material continuum 110 is conveyed to the merging portion G2 between the absorbent main body 10 and the elastic member 51 while maintaining the extended state of the outer layer sheet continuum and the belt-like base material sheet described above, and the exterior material continuation in that state is continuous. The absorbent main body 10 having the above-described configuration is intermittently bonded and fixed on the body 110, and the waist elastic members 51 and 51 are continuously introduced. And the trim 90 for leg opening formation is removed using well-known cutting devices, such as a rotary cutter and a laser cutter, and the diaper continuous body 100 is obtained.

  Next, the extended portions 13a and 13b of the inner layer continuous sheet 130 and the extended portions 12a and 12b of the outer continuous sheet 120a and 120b in the diaper continuous body 100 are integrated so as to sandwich the waist elastic members 51 and 51 therebetween. Folded to the skin contact surface side of the absorbent main body 10, the extended portions 13 a, 13 b of the inner layer continuous sheet 130 are placed on the skin contact surface side of both ends in the longitudinal direction of the absorbent main body 10 via an adhesive 18. Adhere and fix.

Then, the diaper continuous body 100 is folded in two while maintaining the stretched state, and then the side seal portions S, S are formed by heat sealing, ultrasonic sealing, high frequency sealing, or the like, or the side seal portions S, S The pants-type disposable diaper 1 is obtained by cutting into individual diapers at the same time as forming.
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 exterior material continuum 110 can be applied to either or both of the absorbent main body 10 and the exterior material continuum 110. The trim 90 for forming the leg opening can be removed before the absorbent main body 10 is fixed.

According to this embodiment, the diaper 1 can be efficiently and continuously produced in this manner.
The obtained diaper 1 has the non-joint part in which the exterior body 11 is not joined between the stretchable part 17 of the inner layer sheet 13 and the outer layer sheets 12a and 12b. Therefore, the elastic member 71 that forms the stretchable part 17 is provided. Even if wrinkles and wrinkles occur in the stretchable portion 17 of the inner layer sheet 13 due to shrinkage, the stretchable portion 17 is covered with the outer layer sheet 12, and the wrinkles and wrinkles are formed on the outer surface of the diaper made of the outer layer sheet 12. Does not appear, and a good appearance like a clean underwear is obtained.
Moreover, since the outer layer sheet 12 has stretchability derived from the stretchability of the stretchable sheet, the substantially entire region of the outer package 11 expresses stretchability and fits well to the wearer's body shape in a wide range, while the inner layer The wearing pressure at the waistline portion can be locally increased by the stretchable portions 17, 17 of the sheet 13, and the slipping-off performance during wearing can be improved.

Moreover, according to the manufacturing method of the present embodiment, the strip-shaped stretchable sheet having stretchability in the longitudinal direction is used for the outer layer sheet continuous bodies 120a and 120b, and the width direction of the pant-type absorbent article (left and right in FIG. 2). It is possible to stably produce a pants-type absorbent article having good stretchability in the direction) and high finishing accuracy.
That is, even if the outer layer sheet continuums 120a and 120b are sheets having excellent stretchability in the longitudinal direction, the outer packaging obtained by bonding them with the inner layer sheet continuum 130 that is substantially unstretched in the stretched state. The material continuum 110 is hardly stretched any more, or when it is slightly stretched, the further stretch is abruptly suppressed (so-called stretch retention). Therefore, if the exterior material continuum 110 is transported by applying a certain level of tension, even if the tension applied to the exterior material continuum 110 varies during transportation, the elongation amount (elongation rate) of the exterior material continuum 110 is Fluctuation hardly occurs. Therefore, for example, a joining position when the absorbent main body 10 is joined to the exterior material continuous body 110, or a formation position when the leg hole 112 is formed in the exterior material continuous body 110 before and after fixing the absorbent main body 10. The folding position when folding the exterior material continuum 110 (diaper continuum 100) to which the absorbent main body 10 is fixed in two, the predetermined position of the exterior material continuum 110 (diaper continuum 100) to which the absorbent main body 10 is fixed A pant-type disposable diaper with high finishing accuracy is prevented by preventing a shift in the sealing position when sealing and forming the side seal S, the cutting position when cutting and dividing the diaper continuous body 100 into individual diapers, and the like. It can be manufactured stably.

  Further, in the present embodiment, when the outer layer sheet continuous bodies 120a and 120b and the inner layer sheet continuous body 130 are joined, the portions composed only of the inner layer sheet continuous body 130 are generated on both sides of the exterior material continuous body 110. It is joined. Therefore, for example, when both sides of the exterior material continuous body 110 are folded and fixed on both ends of the absorbent main body 10, the substantially non-extensible base sheet 130 is gripped and such an operation is performed. Since it can be performed, the folding position and the fixing position can be controlled with higher accuracy than when both sides of the outer layer sheet continuous body 120a, 120b made of an elastic sheet are gripped. In addition, even when the both sides of the exterior material continuous body 110 are gripped and transported by a pair of rolls, belts, etc., the portions are not easily stretched, and therefore, meandering prevention, transport speed acceleration / deceleration, etc. are performed with high accuracy be able to.

  In the present embodiment, the adhesive 16 that adheres between the inner layer sheet continuous body 130 and the outer layer sheet continuous body 120a, 120b is used in the flow direction of the outer body continuous body 110 as described above. Since the coating part and the non-coating part are intermittently applied so as to occur alternately, a range wider than the width of the elastic member fixing sheet 15 in the diaper longitudinal direction is between the inner layer sheet 13 and the outer layer sheets 12a and 12b. It can be set as the non-joining part which is not joined.

  Moreover, since the pre-cut process which cut | disconnects the waist part elastic member 71 of the inner layer sheet continuous body 130 was given before joining the inner layer sheet continuous body 130 and the outer layer sheet continuous body 120a, 120b, a waistline after joining both continuous bodies Compared with the case where the partial elastic member 71 is cut, it is possible to suppress or reduce damage to the outer layer sheet continuous bodies 120a and 120b.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to embodiment mentioned above, It can change suitably.
For example, in the above embodiment, two outer layer sheet continuums 120a and 120b are joined to one inner layer sheet continuum 130 to obtain one exterior material continuum 110, but instead, One outer layer sheet continuum is joined to one inner layer sheet continuum to obtain an exterior material continuum, and this is used to provide an outer layer sheet continuous across the abdomen, crotch, and back side. A pants-type disposable diaper can also be manufactured.
Also, two outer layer sheet continuums are joined to two inner layer sheet continuums to obtain two exterior material continuums, which are located on the ventral side exterior side and the back side side. A pants-type disposable diaper, etc., comprising a back side exterior body, one end of the absorbent main body in the longitudinal direction being fixed to the abdominal side exterior body, and the other end being fixed to the back side exterior body it can.

Moreover, in the said embodiment, the waist part elastic member 71 and the elastic member fixing sheet 150 are provided on the surface 140a (see FIG. 6) opposite to the surface facing the outer layer continuous sheet in the belt-like base sheet 140. 150 is fixed, but instead, the waistline elastic member 71 and the elastic member fixing sheets 150 and 150 may be fixed to the surface 140b of the base sheet 140 facing the outer layer sheet continuous body.
Points that are not particularly described in these modified examples can be performed in the same manner as in the above-described embodiment. In addition, the description omitted in one embodiment and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately applied between the embodiments. Can be substituted.

  Further, the pant-type absorbent article produced in the present invention may be a pant-type (including what is called a shorts-type) sanitary napkin or the like.

FIG. 1 is a perspective view showing a pants-type disposable diaper as an example of a pants-type absorbent article manufactured according to the present invention. Fig.2 (a) is an expansion | deployment top view which shows the expansion | deployment state of the diaper shown in FIG. 1, FIG.2 (b) is an expansion | deployment top view which shows the state which removed the absorptive main body from Fig.2 (a). . It is a disassembled perspective view of the diaper shown in FIG. FIG. 4 is a cross-sectional view taken along line II-II in FIG. FIG. 5 is a sectional view taken along line III-III in FIG. It is a model perspective view which shows the outline of the preferable manufacturing method of the diaper shown in FIG.

Explanation of symbols

1 Pants-type disposable diapers (pants-type absorbent articles)
2 Top sheet 3 Back sheet 4 Absorbent core 5 Waist opening 6 Leg opening 10 Absorbent body 11 Exterior material 12A Ventral outer layer sheet (outer layer sheet)
12B Backside outer layer sheet (outer layer sheet)
120a, 120b Outer layer continuous sheet 13 Inner layer sheet 17 Stretchable part 130 Inner layer continuous sheet 14 Base material sheet 140 Band-shaped base sheet 15 Elastic member fixing sheet 150 Band-shaped elastic member fixing sheet 110 Exterior material continuous body 100 Diaper continuous body

Claims (3)

The outer sheet includes an absorbent main body and an exterior material, and the exterior material includes an outer layer sheet made of a stretchable sheet and an inner layer sheet disposed on the absorbent body side of the outer layer sheet, and the inner layer sheet is a base sheet. A waist part elastic member is fixed between the elastic member fixing sheet and the elastic member fixing sheet, and the exterior body is not joined between the elastic part of the inner layer sheet and the outer layer sheet A method for producing a pants-type absorbent article having a non-joined portion,
Fixing the waistline elastic member between a belt-like base material sheet and an elastic member fixing sheet, and obtaining an inner layer sheet continuous body having the stretchable part;
An outer layer sheet continuous body made of a belt-shaped stretchable sheet is joined to the inner layer sheet continuous body in an expanded state, and at least a portion between the stretchable portion and the outer layer sheet continuous body of the inner layer sheet continuous body Obtaining an unbonded exterior material continuum,
A process of obtaining an absorbent article continuum by fixing the absorbent main body to the exterior material continuum, and after folding the absorbent article continuum in two, a side seal portion is formed and cut into individual pant types The manufacturing method of the underpants type absorbent article which comprises the process isolate | separated into an absorbent article. In the pant-type absorbent article, the outer layer sheet is divided into a ventral outer layer sheet positioned on the ventral side and a dorsal outer layer sheet positioned on the dorsal side, and the inner layer sheet is ventral Part, crotch and back side,
The underpants-type absorbent article according to claim 1, wherein in the step of obtaining the exterior material continuum, two exterior layer sheet continuums are joined to one inner layer sheet continuum to obtain one exterior material continuum. Manufacturing method.   In the step of obtaining the exterior material continuum, the outer layer sheet continuum is joined to the inner layer sheet continuum so that portions consisting only of the inner layer sheet continuity are formed on both sides of the exterior material continuum. Or the manufacturing method of the underpants type absorbent article of 2.

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