JP2018038690A - Method and apparatus for manufacturing elastic sheet and absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a stretchable sheet and an absorbent article capable of highly efficiently manufacturing a high-quality stretchable sheet that includes two mutually-facing sheets and a plurality of elastic member fixed between both sheet in a stretched state, and a manufacturing apparatus.SOLUTION: At least one cutting projection 55 for cutting an elastic member of a stretchable sheet is disposed at an area 50B corresponding to a non-stretchable area, on a peripheral surface of a processing roll on an extension line of a sealing projection 54 in a rotary shaft direction CD. A front end 54a of the sealing projection 54 in a rotating direction R1 of the processing roll and a front end 55a in the rotation direction R1 in the cutting projection 55 that is present on an extension line of the sealing projection 54 are located at a same position in the rotation direction R1.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a stretchable sheet in which a plurality of elastic members are arranged in an expanded state between sheets and have a non-stretchable portion by cutting the elastic member, and a method for manufacturing an absorbent article including the stretchable sheet.

  Conventionally, in an absorbent article such as a disposable diaper, an elastic sheet having elasticity in a predetermined direction is used in order to improve adhesion to a wearer of a predetermined part such as a waist part and a waist part, As the stretchable sheet, there is known a structure in which a plurality of thread-like or band-like elastic members are arranged in a stretched state on a non-stretchable sheet that does not inherently stretch, such as a nonwoven fabric or a plastic film. Moreover, as an elastic sheet, not only the sheet | seat which has the elasticity of the whole sheet | seat but the thing which has a non-expandable part which is provided with a elasticity | stretchability only to a required part, and does not have a elasticity is also known.

  For example, in Patent Document 1, as a method for producing a stretchable sheet having a non-stretchable portion, between a first roll having a plurality of convex portions arranged on the surface and a second roll facing the first roll, between the sheets. A laminate in which a plurality of elastic members are arranged in an elongated state is passed, and the elastic member of the laminate is pressed between the convex portion of the first roll and the second roll, and both rolls. A method of cutting by heating with is described. Patent Document 1 relates to a technique for improving a pants-type disposable diaper that includes an exterior body and an absorbent main body that is disposed in the center of the exterior body on the skin-facing surface side and includes a liquid-retaining absorbent core. The stretchable sheet is used for the outer package of this diaper.

JP 2009-118986 A

  According to the manufacturing method described in Patent Document 1, a high-quality disposable diaper excellent in appearance and fit of the outer package as the stretchable sheet can be obtained. However, the quality required for absorbent articles has been increasing in recent years, and a technology capable of providing higher-quality components has been demanded.

  The subject of this invention is providing the manufacturing method and manufacturing apparatus of an elastic sheet and an absorbent article which can eliminate the fault which the prior art mentioned above has.

The present invention includes two sheets facing each other and a plurality of elastic members fixed in an extended state between the two sheets, and the sheets are joined to each other at a plurality of joint portions where the sheets are intermittently arranged. The elastic member has a stretchable region that extends in one direction without passing through the joint portion, and a non-stretchable region that is cut and has a lower stretchability than the stretchable region. A method for producing an elastic sheet, wherein the elastic region is arranged at a position overlapping with the extended region when the region is virtually extended in a direction orthogonal to the extending direction of the elastic member,
An elastic sheet precursor in which a plurality of elastic members are fixed in an extended state between two sheets is caused to travel along the extending direction of the elastic member, and a processing roll having a protruding portion formed on the peripheral surface and the processing By passing between an anvil roll disposed opposite to the roll, the step of forming the joint portion corresponding to the pattern of the convex portion and the cut portion of the elastic member in the stretchable sheet precursor,
A plurality of sealing convex portions as the convex portions for forming the joint portion are intermittently provided in both the rotation axis direction and the circumferential direction of the processing roll in a region corresponding to the expansion and contraction region on the peripheral surface of the processing roll. As well as
In a region corresponding to the non-stretchable region on the peripheral surface of the processing roll, a cutting convex portion as the convex portion for forming the cutting portion is virtually disposed in the direction of the rotation axis. At least one is arranged on the extension line when extended,
The front end in the rotational direction of the work roll in the sealing convex portion and the front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex portion are in the same position in the rotational direction. It is a manufacturing method of an elastic sheet.

The present invention also has an absorbent main body having a longitudinal direction corresponding to the wearer's front-rear direction and a lateral direction perpendicular thereto, and including a liquid-retaining absorbent in the lateral center, and the absorbent main body. The outer body disposed on the non-skin facing surface side of the front body and the back body, both side edges along the longitudinal direction of the outer body are joined to each other so that a pair of side seal portions, a waist opening portion, and a pair of In the absorbent article in which the leg opening is formed,
The exterior body includes two sheets facing each other and a plurality of elastic members fixed in an extended state between the two sheets, and the sheets are joined to each other at a plurality of joint portions in which the sheets are intermittently arranged. A plurality of elastic members extending in a lateral direction without passing through the joint portion; and a non-stretchable region having a lower elasticity than the elastic region when the elastic member is cut, A method for manufacturing an absorbent article, wherein the stretchable region is disposed at a position overlapping the stretched region when the stretchable region is virtually extended in the longitudinal direction,
An exterior body precursor in which a plurality of elastic members are fixed in a stretched state between two sheets is run along the extending direction of the elastic members, and a processing roll having protrusions formed on the peripheral surface and the processing By passing between the anvil roll disposed opposite to the roll, the outer body precursor includes the step of forming the joint portion corresponding to the pattern of the convex portion and the cut portion of the elastic member,
A plurality of sealing convex portions as the convex portions for forming the joint portion are intermittently provided in both the rotation axis direction and the circumferential direction of the processing roll in a region corresponding to the expansion and contraction region on the peripheral surface of the processing roll. As well as
In a region corresponding to the non-stretchable region on the peripheral surface of the processing roll, a cutting convex portion as the convex portion for forming the cutting portion is virtually disposed in the direction of the rotation axis. At least one is arranged on the extension line when extended,
The front end in the rotational direction of the work roll in the sealing convex portion and the front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex portion are in the same position in the rotational direction. It is a manufacturing method of an absorbent article.

The present invention also includes two sheets facing each other and a plurality of elastic members fixed in an extended state between the two sheets, and the two sheets are joined to each other at a plurality of joints arranged intermittently, and A plurality of elastic members extending in one direction without passing through the joint portion; and a non-stretchable region having a lower elasticity than the elastic region when the elastic member is cut, A manufacturing apparatus for manufacturing a stretchable sheet, wherein the stretchable region is arranged at a position overlapping with the extension region when the stretchable region is virtually extended in a direction orthogonal to the extension direction of the elastic member,
It has a processing roll having protrusions formed on the peripheral surface and an anvil roll disposed opposite to the processing roll, and a plurality of elastic members are fixed in an extended state between the two sheets between the two rolls. By supplying the stretchable sheet precursor, the stretchable sheet precursor can be formed with the joint portion corresponding to the pattern of the convex portion and the cut portion of the elastic member,
A plurality of sealing convex portions as the convex portions for forming the joint portion are intermittently provided in both the rotation axis direction and the circumferential direction of the processing roll in a region corresponding to the expansion and contraction region on the peripheral surface of the processing roll. As well as
In a region corresponding to the non-stretchable region on the peripheral surface of the processing roll, a cutting convex portion as the convex portion for forming the cutting portion is virtually disposed in the direction of the rotation axis. At least one is arranged on the extension line when extended,
The front end in the rotational direction of the work roll in the sealing convex portion and the front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex portion are in the same position in the rotational direction. It is a manufacturing apparatus of an elastic sheet.

  According to the present invention, it is possible to efficiently manufacture a high-quality stretchable sheet including two sheets facing each other and a plurality of elastic members fixed in an extended state between the two sheets. Since such an elastic sheet can also be used for the waist portion of the absorbent article, etc., according to the present invention, an absorbent article excellent in appearance, fit and the like can be obtained. In addition to the elastic member, the stretchable sheet further includes a joint portion between two opposing sheets. According to the present invention, in the production of the stretchable sheet, the formability of the joint portion is provided. And the cutability of the elastic member can be achieved at a high level.

Drawing 1 is a schematic diagram of a manufacturing method of a pants type disposable diaper as one embodiment of a manufacturing method of an absorptive article of the present invention. FIG. 2 is a perspective view schematically showing a pants-type disposable diaper manufactured by carrying out the manufacturing method shown in FIG. FIG. 3 is a developed plan view schematically showing a partially broken skin facing surface side in the developed and extended state of the diaper shown in FIG. FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 5 is an exploded perspective view schematically showing the diaper shown in FIG. 2 in an exploded manner. FIG. 6 is a perspective view schematically showing a part of the exterior body constituting the outer surface of the belly side or the back side of the diaper shown in FIG. FIG. 7 is a front view of both rolls schematically showing a processing roll and an anvil roll used in the manufacturing method shown in FIG. 1 together with an exterior body processed by both rolls. FIG. 8 is a plan view schematically showing an example of a pattern of convex portions in the processing roll according to the present invention. FIG. 9 is a plan view schematically showing another example of the pattern of convex portions in the processing roll according to the present invention. FIG. 10 is a plan view schematically showing still another example of the pattern of convex portions in the processing roll according to the present invention. FIG. 11: is a top view which shows typically an example of the arrangement pattern of the convex part in the processing roll used with the manufacturing method of the conventional absorbent article.

  Hereinafter, the manufacturing method of the stretchable sheet according to the present invention, together with the manufacturing method of the absorbent article according to the present invention, including the configuration substantially the same as the characteristic part of the manufacturing method, with reference to the drawings based on the preferred embodiments thereof explain. FIG. 1 shows an outline of a method for manufacturing a pants-type disposable diaper as an embodiment of the method for manufacturing an absorbent article of the present invention. FIGS. 2 to 6 show pants manufactured by such a manufacturing method. A mold disposable diaper 1 is shown.

  In the manufacturing method of the underpants type disposable diaper of this embodiment, as shown in FIG. 1, the diaper continuous body 20 (absorbent article continuous body) which the diaper 1 continues in one direction is manufactured, and this diaper continuous body 20 The pants-type disposable diaper 1 including the exterior body 3 having a pair of side seal portions S and S formed by the joining is continuously manufactured. To do. First, the diaper 1 will be described.

  The diaper 1 has the longitudinal direction X corresponding to a wearer's front-back direction, and the horizontal direction Y orthogonal to this, and equips the center part of the horizontal direction Y with the absorptive main body 2 containing the liquid holding | maintenance absorber 23. And the outer body 3 disposed on the non-skin facing surface side of the absorbent main body 2, and both side edges FS and RS along the longitudinal direction X of the outer body 3 in the front body F and the rear body R respectively. A pair of side seal portions S, S, a waist opening WH through which the wearer's torso is passed, and a pair of leg openings LH, LH through which the wearer's lower limb is passed are formed.

  As shown in FIG. 3, the front body F is a front side (abdominal side) of the wearer's body at the time of wearing with reference to a longitudinal center line CLx extending in the lateral direction Y by dividing the diaper 1 or the exterior body 3 into the longitudinal direction X. ) And the back body R is a portion covering the back side (back side) of the wearer's body. Further, in this specification, the “skin-opposing surface” is a surface of the absorbent article or a constituent member thereof (for example, an absorbent main body) that is directed to the skin side of the wearer when the absorbent article is worn, that is, a relatively wearer. The “non-skin-facing surface” is the surface of the absorbent article or its component that is directed to the side opposite to the skin side when the absorbent article is worn, that is, the skin of the wearer relatively. On the far side. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  The diaper 1 includes an abdominal side A disposed on the wearer's belly side when worn, a dorsal side C disposed on the dorsal side, and a crotch B positioned between them and disposed on the wearer's crotch part. have. The abdominal side A is a part of the front body F, the back side C is a part of the back body R, and the crotch B extends over the front body F and the back body R. The abdominal side part A and the back side part C are parts that are in the same position as the side seal part S in the longitudinal direction X, and are arranged around the waist including the wearer's waist part when the diaper 1 is worn. The crotch part B is a region in which recesses for forming the leg openings LH and LH are formed at both side edges along the longitudinal direction X of the exterior body 3.

  The absorbent main body 2 has a rectangular shape in plan view when the diaper 1 is expanded and stretched as shown in FIG. 3, and extends in the longitudinal direction X from the ventral side A to the dorsal side C. Is aligned with the longitudinal direction X of the diaper 1 in the unfolded and extended state, and is arranged at the central portion in the lateral direction Y of the exterior body 3 and joined to the exterior body 3 with an adhesive. The “expanded and extended state” of the diaper 1 means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the expanded diaper 1 is stretched by the elastic member of each part to design dimensions (the influence of the elastic member is not at all). It means a state in which it is expanded until it becomes the same size as when it is expanded in a flat state in the excluded state.

  As shown in FIG. 4, the absorbent main body 2 includes a liquid-permeable surface sheet 21 that forms a skin-facing surface, and a liquid-impermeable or liquid-permeable or water-repellent back sheet 22 that forms a non-skin-facing surface. And a liquid-retaining absorbent 23 interposed between the two sheets 21 and 22, which are integrated by a known joining means such as an adhesive. The absorber 23 is located in the central part of the diaper 1 or the exterior body 3 in the lateral direction Y. As the top sheet 21, the back sheet 22, and the absorber 23, various types conventionally used for this type of absorbent article can be used without particular limitation. For example, various nonwoven fabrics or apertured films can be used as the top sheet 21, and a resin film, a laminate of a resin film and a nonwoven fabric, or the like can be used as the back sheet 22. As the absorbent body 23, an absorbent core made of an absorbent material such as hydrophilic fibers such as wood pulp and synthetic fiber treated with a hydrophilizing agent or water-absorbing polymer particles can be used. You may coat | cover with core wrap sheets, such as paper and a nonwoven fabric.

  As shown in FIGS. 3 and 4, the left and right side portions along the longitudinal direction X of the skin-facing surface of the absorbent main body 2 are provided with a pair of liquid-resistant or water-repellent and breathable sheet materials. Leakage cuffs 24, 24 are provided. In the vicinity of the free end portion of each leak-proof cuff 24, one or more elastic members 25 for forming a leak-proof cuff are arranged in an extended state (one in this embodiment). The leak-proof cuff 24 stands up at least at the crotch B when the elastic member 25 arranged in an elongated state in the longitudinal direction X contracts when the diaper 1 is worn, thereby causing the urine and other excretory fluids in the lateral direction Y to be raised. To prevent the outflow.

  The outer package 3 forms the outer shape of the unfolded and expanded diaper 1 as shown in FIG. 3, and the outer periphery of the outer package 3 has contour lines of the diaper 1 in that state, that is, the ventral side A, the crotch B and A contour line of each of the back side portions C is formed. As shown in FIG. 3, the exterior body 3 has a rectangular shape in which the length in the lateral direction Y is longer than the longitudinal direction X in the abdominal side A and the back side C. In the crotch part B located between C and C, both side edges along the longitudinal direction X of the outer package 3, that is, the pair of leg edge parts LS, LS are curved in a convex arc shape toward the center in the lateral direction Y. In the plan view as shown in FIG. 3, the central region in the vertical direction X has an hourglass shape bound inward in the horizontal direction Y.

  As shown in FIGS. 3 to 5, the exterior body 3 includes two sheets 31 and 32 facing each other, and a plurality of elastic members 33 fixed between the sheets 31 and 32 in an extended state. The stretchable region 10 in which the sheets 31 and 32 are joined to each other at a plurality of joint portions 36 arranged intermittently and the plurality of elastic members 33 extend in the lateral direction Y without passing through the joint portions 36, and the elastic member 33 Is cut and has a non-stretchable region 11 that is less stretchable than the stretchable region 10, and the non-stretchable region 11 is virtually extended in the longitudinal direction X (direction perpendicular to the extending direction of the elastic member 33). The expansion / contraction region 10 is arranged at a position overlapping the extension region 12.

  The outer package 3 will be further described. The outer package 3 includes an outer layer sheet 31 that forms an outer surface of the diaper 1 in a worn state, that is, a non-skin facing surface, and an inner layer sheet 32 that is disposed to face the skin facing surface of the outer layer sheet 31. It is comprised including a laminated body. In the wearing state of the diaper 1, the outer layer sheet 31 is positioned on the side far from the wearer's body to form a non-skin facing surface (outer surface) of the diaper 1, and the inner layer sheet 32 is positioned on the side closer to the wearer's body. And the skin opposing surface (inner surface) of the diaper 1 is formed. The outer layer sheet 31 and the inner layer sheet 32 are joined to each other at a predetermined portion by a joining means such as fusion or adhesive. In addition to the same shape and the same size as the inner layer sheet 32, the outer layer sheet 31 further includes an extending portion 31E that extends from the edge of the inner layer sheet 32 in the longitudinal direction X when the sheets 31 and 32 are laminated. As shown in FIG. 3, the extended portion 31E is folded back to the skin facing surface side of the inner layer sheet 32, and the end portion in the longitudinal direction X of the absorbent main body 2 is provided on the ventral side portion A and the back side portion C. It is covered.

  A plurality of thread-like or belt-like waistline elastic members 33 are arranged in the lateral direction Y in the stretched state in the lateral side A and the back side C. The plurality of waistline elastic members 33 extend in the lateral direction Y through the region at the same position as the side seal portion S in the longitudinal direction X, that is, the opening edge 1E of the waist opening WH (the upper end of the side seal portion S). In a region sandwiched between a virtual straight line) and a virtual straight line VL (see FIG. 3) extending in the horizontal direction Y through the lower end Sb of the side seal portion S, the waist elastic members 33 are intermittently arranged in the vertical direction X. , Extending in the lateral direction Y from one of the pair of side seal portions S, S to the other.

  In the crotch part B, one or a plurality (in the illustrated embodiment, a plurality) of thread-like or belt-like leg elastic members 34 are arranged in an extended state along the leg edge LS. As a result, annular leg gathers that are substantially continuous over the entire circumference are formed at the opening edges of the pair of leg openings LH, LH (see FIG. 1).

  Both the waist elastic member 33 and the leg elastic member 34 are sandwiched and fixed between the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3 by a bonding means such as an adhesive. As these elastic members 33 and 34, those in which stretchable materials such as natural rubber, polyurethane resin, foamed urethane resin, and hot-melt stretchable member are formed into a thread shape (thread rubber) or a belt shape (flat rubber) are preferable. Used.

  The outer layer sheet 31 and the inner layer sheet 32 constituting the outer package 3 are each preferably formed of a resin as a main component from the viewpoint of using the bonding portion 36 as a fused portion. In particular, those containing a heat-fusible resin such as polyethylene, polyethylene terephthalate, and polypropylene are preferred, and nonwoven fabrics, films, and laminate sheets of nonwoven fabrics and films are particularly preferred. Examples of the nonwoven fabric include air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric.

  As shown in FIGS. 3 and 5, in the abdominal side portion A and the back side portion C, the waist elastic member 33 is cut at the arrangement site of the absorbent main body 2 in the exterior body 3 to expand and contract more than the expansion region 10. A non-stretchable region 11 having low properties is formed. In the non-stretchable region 11, a plurality of cut portions 37 of the waist elastic member 33 are intermittently arranged in both the vertical direction X and the horizontal direction Y. The non-stretchable region 11 is a region having lower stretchability than the stretchable region 10 and may have some stretchability due to the waistline elastic member 33 remaining after cutting. As described above, the non-stretchable region 11 is formed in the overlapping portion of the outer package 3 with the absorbent main body 2, thereby causing the absorbent main body 2 including the absorbent body 23 without causing vertical wrinkles. It becomes possible to make the edge part of the vertical direction X of the wearer's body follow the wearer's body, thereby preventing leakage effectively and causing the top of the heel produced in the absorbent main body 2 to hit the skin. Inconveniences such as marks are effectively prevented.

  In the diaper 1, from the same viewpoint, as shown in FIG. 5, a cut portion 38 of the leg elastic member 34 is formed at the arrangement site of the absorbent main body 2 in the exterior body 3. Due to the presence of the cut portion 38, the leg elastic member 34 substantially exhibits elastic elasticity at the outer side in the lateral direction Y from both side edges 2S, 2S along the longitudinal direction X of the absorbent main body 2. The elastic stretchability is not substantially exhibited at the arrangement site of the absorbent main body 2.

  In the ventral portion A and the dorsal portion C, at least the non-stretchable region 11 expands and contracts to a position overlapping the extension region 12 when virtually extending in the longitudinal direction X (direction orthogonal to the extending direction of the elastic member 33). Area 10 is arranged. Further, in the abdominal side A and the back side C, the stretchable region 10 is also arranged on the outer side in the lateral direction Y from the arrangement site of the absorbent main body 2. That is, the remaining portion excluding the non-stretchable region 11 (arrangement site of the absorbent main body 2) and the side edge portions FS, RS constituting the side seal portion S is the stretchable region 10 (see FIG. 3). The extension region 12 is a part of the stretchable region 10. In the stretchable region 10, the outer layer sheet 31 and the inner layer sheet 32 are joined to each other at a plurality of joints 36, and the plurality of waist elastic members 33 extend in the lateral direction Y without passing through the joints 36, Due to the stretchability of the waistline elastic member 33, it has stretchability in the lateral direction Y. The stretchable region 10 is a region having higher stretchability than the non-stretchable region 11 because the waistline elastic member 33 is not cut. The joining portion 36 is formed by fusing the outer layer sheet 31 and the inner layer sheet 32 constituting the exterior body 3. In the joining part 36, both the sheets 31 and 32 which consist of a nonwoven fabric etc. have comprised the film form or the form according to it. In addition, the planar view shape of the junction part 36 is not restrict | limited to a rectangular shape like illustration, It can set arbitrarily, such as circular shape and elliptical shape.

  As shown in FIG. 3, in the stretchable region 10 of the ventral portion A and the dorsal portion C, the plurality of joint portions 36 are formed in rows in the vertical direction X and the horizontal direction Y, respectively. The rows of joints 36 extending in the direction Y and the waist elastic members 33 are alternately arranged in the vertical direction X. Then, as shown in FIG. 6, in the natural state, that is, in the state where no external force is applied, the waistline elastic member 33 contracts in the lateral direction Y, and each of the outer layer sheet 31 and the inner layer sheet 32 has a plurality of waistline elasticity. A plurality of ridges 35 extending continuously in the longitudinal direction X over the member 33 are formed. In the present embodiment, as shown in FIG. 6, one ridge 35 is formed between the joint portions 36 and 36 adjacent in the lateral direction Y.

  In the expansion / contraction region 10 of the ventral side A and the back side C, the plurality of ridges 35 are continuous over the entire length in the direction orthogonal to the expansion / contraction direction of the exterior body 3. The expansion / contraction direction of the exterior body 3 coincides with the lateral direction Y, which is the expansion / contraction direction of the waistline elastic member 33, and accordingly, the plurality of collars 35 are continuous over the entire length in the vertical direction X. The flange 35 is hollow, and the inside thereof can function as a ventilation path through which air flows. Thus, the stretchable regions 10 of the abdominal part A and the back part C, that is, the parts other than the part where the absorbent main body 2 is arranged have a plurality of hollow ridges 35 that can function as ventilation paths in their longitudinal direction X. Since it is formed over the entire length, the diaper 1 is excellent in breathability and cushioning properties. Moreover, since the plurality of ridges 35 extending in the vertical direction X are regularly aligned in the horizontal direction Y on the outer surface of the exterior body 3, the diaper 1 is also excellent in appearance. In the abdominal part A and the dorsal part C, the collar 35 is formed only in the stretchable region 10, and the collar 35 is not formed in the non-stretchable region 11 existing in the site where the absorbent main body 2 is disposed.

  In the ventral side A and the dorsal side C, as shown in FIGS. 3 and 5, the non-stretchable region 11 is virtually extended in the longitudinal direction X (direction perpendicular to the extending direction of the waistline elastic member 33). There is a stretchable region 10 that overlaps the extended region 12 of the case. That is, the exterior body 3 of the ventral portion A and the dorsal side portion C has a stretchable region 10 that is an extended region 12 and a non-stretchable region 11 that is present in an arrangement site of the absorbent main body 2 at the center in the lateral direction Y. , And a portion existing at the same position in the lateral direction Y (the extending direction of the waistline elastic member 33). In addition, when the joint portion 36 in the extension region 12 is virtually extended to the inner side in the longitudinal direction X (the longitudinal center line CLx side of the diaper 1), the cutting portion 37 of the waistline elastic member 33 is on the extension line. At least one is arranged. In this embodiment, as shown in FIG. 3, a plurality of joints 36 are intermittently arranged in the lateral direction Y in the extension region 12, and each of the plurality of joints 36 whose positions in the lateral direction Y are different from each other. The cutting part 37 is arranged on the extension line. In other words, in the present embodiment, the number of cut portions 37 of the non-stretchable region 11 and the number of joint portions 36 of the extended region 12 are the same in the lateral direction Y.

  The diaper 1 having the configuration including the stretchable region 10 (extension region 12) and the non-stretchable region 11 as described above is manufactured through, for example, a process as shown in FIG. In the process shown in FIG. 1, an exterior body precursor (expandable sheet precursor) 30 in which a plurality of elastic members 33 and 34 are fixed in an extended state between two sheets 31 and 32, and the elastic members 33 and 34 are extended. It is made to run along a direction, and it passes between the anvil roll 60 arranged opposite to the processing roll 50 by which the convex part 53 protruded on the surrounding surface, and the convex part is projected to the exterior body precursor 30. A step of forming the joint portion 36 corresponding to the pattern 53 and the cut portions 37 and 38 of the elastic members 33 and 34. The process shown in FIG. 1 is the same as the manufacturing method of the conventional pants-type disposable diaper except for the arrangement pattern of the convex part 53 of the processing roll 50, etc.

  The arrow shown by the code | symbol MD (Machine Direction) in FIG. 1 is the conveyance direction of the exterior body precursor 30 (sheets 31 and 32), the exterior body 3 obtained by processing it, and the diaper continuous body 20, and is an elastic member. It coincides with the extension direction of 33,34. The leg elastic member 34 has a portion that extends in the transport direction MD and a portion that extends in a direction crossing the leg direction. The conveyance direction MD coincides with the transverse direction Y of the diaper 1 (extension direction of the elastic members 33, 34), and the width direction CD (Cross machine Direction) orthogonal to the conveyance direction MD is the longitudinal direction X (elastic member) of the diaper 1. In the direction orthogonal to the extending direction of 33 and 34). That is, the manufacturing method of the diaper 1 including the process of FIG. 1 manufactures a diaper with what is called a cross-flow system.

  In the manufacturing method of the diaper 1, first, as shown in FIG. 1, a strip-shaped outer layer sheet 31 continuously supplied from a raw fabric roll (not shown) and a strip-shaped outer sheet 31 continuously supplied from a raw fabric roll (not shown). A predetermined number of the waistline elastic members 33 and the leg elastic members 34 are arranged between the inner layer sheet 32 and the inner layer sheet 32 in a stretched state that is stretched to a predetermined stretch rate. At this time, the leg elastic member 34 is arranged while forming a predetermined leg-circumferential pattern via a known swing guide (not shown) that reciprocates perpendicularly to the conveying direction MD of both sheets 31 and 32. Is done. In addition, before the sheets 31 and 32 are superposed on each other, a hot melt adhesive is applied to a predetermined part of one or both surfaces of the sheets 31 and 32 by an adhesive coating machine 40. Apply. In the embodiment of FIG. 1, an adhesive is applied to the surface of the sheet 31 facing the sheet 32. A hot melt adhesive may be applied to each of the elastic members 33 and 34 before being disposed between the sheets 31 and 32.

  Then, as shown in FIG. 1, two belt-like sheets 31 and 32 having elastic members 33 and 34 sandwiched between the pair of nip rolls 41 and 41 in an expanded state are supplied and pressurized, whereby both A band-shaped exterior body precursor 30 in which a plurality of elastic members 33 and 34 are fixed in an expanded state between the sheets 31 and 32 is formed.

  Next, as shown in FIG. 1, the exterior body precursor 30 is supplied between the processing roll 50 and the anvil roll 60 along the extending direction of the elastic members 33 and 34, and this is pressurized, whereby the exterior body precursor 30 is pressed. The body precursor 30 is formed with joint portions 36 corresponding to the pattern of the convex portions 53 of the processing roll 50 and cut portions 37 and 38 of the elastic members 33 and 34, and the stretch region 10 and the extension region 12 where the joint portions 36 exist. The strip-shaped exterior body 3 having the non-stretchable region 11 where the cutting portion 37 exists is formed. The exterior body 3 formed in this way includes “two sheets 31 and 32 facing each other and a plurality of elastic members 33 and 34 fixed between the sheets 31 and 32 in an extended state. , 32 are joined to each other at a plurality of joints 36 arranged intermittently, and the elastic members 33 are cut off from the stretchable region 10 in which the plurality of elastic members 33, 34 extend in one direction without passing through the joints 36. And the non-stretchable region 11 having a lower stretchability than the stretchable region 10, and the non-stretchable region 11 is virtually extended in a direction CD orthogonal to the extending direction of the elastic member 33 (the same direction as the conveying direction MD). In this case, the stretchable area 10 is arranged at the position of the extension area 12.

  Next, as shown in FIG. 1, an inner layer sheet 32 constituting a strip-shaped exterior body 3 is prepared by previously applying an adhesive such as a hot-melt adhesive to the absorbent main body 2 manufactured in a separate process (not shown). Supply and fix intermittently on top. The adhesive for fixing the absorbent main body may be preliminarily applied not to the absorbent main body 2 but to the position where the absorbent main body 2 is arranged in the inner layer sheet 32.

  Next, as shown in FIG. 1, the leg opening LH is formed inside the annular portion that is annularly surrounded by the leg elastic members 34 in the strip-shaped exterior body 3 in which the absorbent main body 2 is disposed. The step of forming the leg opening LH can be carried out by using a technique similar to the technique in the conventional method for manufacturing this type of article such as a rotary cutter and a laser cutter. In the present embodiment, the leg opening LH is formed after the absorbent main body 2 is disposed on the belt-shaped exterior body 3, but the leg opening LH may be formed before the absorbent main body 2 is disposed. good.

  Next, the strip-shaped exterior body 3 is folded in the width direction, that is, in a direction orthogonal to the conveyance direction MD of the exterior body 3. More specifically, as shown in FIG. 1, both side portions 3 </ b> S and 3 </ b> S along the conveying direction of the belt-shaped outer package 3 are folded back so as to cover both longitudinal ends of the absorbent main body 2. After fixing both ends in the longitudinal direction, the outer package 3 is folded in the width direction together with the absorbent main body 2. In this way, the diaper continuous body 20 is obtained. Then, according to a conventional method, the diaper continuous body 20 is divided | segmented separately, Furthermore, the pants type disposable diaper 1 is obtained by mutually joining the sheet | seat in the part parted.

  The conventional manufacturing method of a pants-type disposable diaper includes a process having the same basic configuration as the process shown in FIG. 1, and in particular, an embossing roll such as a processing roll 50 and an anvil roll 60 is implemented. Regarding the “simultaneous execution step of joining the two sheets 31 and 32 and cutting the elastic member 33 arranged therebetween”, there was a point to be improved.

  Here, the problem of the pants-type disposable diaper obtained by the conventional manufacturing method will be described with reference to FIG. 3. The pants-type disposable diaper obtained by the conventional manufacturing method uses the stretchable direction of the waist elastic member 33 in the non-stretchable region 11. In the extension region 12 when virtually extending in the direction (longitudinal direction X) orthogonal to (lateral direction Y), the bonding between the outer layer sheet 31 and the inner layer sheet 32 at the bonding portion 36 becomes insufficient, and as a result, So-called sheets 31 and 32 are lifted, and the heels 35 are regularly formed as shown in FIG. 6, and the exterior body 3 that is excellent in appearance, fit, wearing feeling, and the like may not be obtained. In addition, in the non-stretchable region 11 existing at the site where the absorbent main body 2 is disposed, the formation of the cut portion 37 of the waistline elastic member 33 is insufficient, and as a result, the stretchability of the waistline elastic member 33 is not present in the non-stretchable region 11. The absorbent main body 2 which remains excessively and is disposed so as to overlap the non-stretchable region 11 may cause undesirable vertical wrinkles, which may cause a decrease in fit and a feeling of wearing.

  In view of the problem of such a conventional method for manufacturing a pants-type disposable diaper, in the method for manufacturing a pants-type disposable diaper according to this embodiment, “the joining of two sheets 31 and 32 and an elastic member disposed therebetween” In order to carry out the “simultaneous execution step of 33” smoothly without any inconvenience, the present invention has been devised by paying particular attention to the processing roll 50 that directly relates to the formation of the joining portion 36 and the cutting portion 37. One of the features, that is, one of the main features of the present invention will be described below. First, the basic structure of the processing roll 50 and the anvil roll 60 which are the premise of such a device will be described with reference to FIG.

  As shown in FIG. 7, the work roll 50 includes a cylindrical rotating body 52 that is rotatably supported in a direction R <b> 1 (see FIG. 1) around the rotation shaft 51. Further, the anvil roll 60 facing the processing roll 50 includes a cylindrical rotating body 62 that is rotatably supported in a direction R <b> 2 (see FIG. 1) around the rotation shaft 61. Both rolls 50 and 60 are arranged so as to rotate synchronously when a driving force from a driving means (not shown) is transmitted to their rotating shafts 51 and 61. The circumferential surface of the rotating body 52 of the work roll 50 has a concavo-convex shape with a large number of protruding portions 53 protruding, whereas the circumferential surface of the rotating body 62 of the anvil roll 60 has a concavo-convex shape. It is substantially smooth (macroscopically).

  Each member which comprises both the rolls 50 and 60 is comprised including metal rigid bodies, such as various tool steels (iron and steel), such as die steel. In the present embodiment, each of the rolls 50 and 60 is provided with heating means (not shown) such as a heater inside, and passes between the rolls 50 and 60 by heat conduction from the heating means. Heat is transmitted to the workpiece to be processed (exterior body precursor 30). However, in the present invention, such a heating means is not essential, and the heating means may not be attached to either of the rolls 50, 60, or the heating means may be attached to only one of them. good.

  As shown in FIG. 1, the exterior body precursor 30 (the exterior body in which the joining portion 36 and the cut portions 37 and 38 of the elastic members 33 and 34 are not formed) is moved in the extending direction of the elastic members 33 and 34 (the diaper 1 When traveling between the processing roll 50 rotating in the direction R <b> 1 and the anvil roll 60 rotating in the direction R <b> 2, the convex portion 53 of the processing roll 50 and the anvil roll 60 are A joint 36 between the outer layer sheet 31 and the inner layer sheet 32 is formed at the site where the stretchable region 10 is to be formed in the exterior body precursor 30 by pressurization with the peripheral surface and further heating from both rolls 50 and 60. At the same time, the elastic members 33 and 34 at the site where the non-stretchable region 11 is to be formed, that is, the site where the absorbent main body 2 is to be arranged are cut to form the cut portions 37 and 38, thereby obtaining the exterior body 3. The pattern of the joining part 36 and the cutting parts 37 and 38 formed in this way corresponds to the pattern of the convex part 53 of the processing roll 50 (see FIG. 7).

  The convex portion 53 on the peripheral surface of the processing roll 50 will be described. As shown in FIG. 7, a region corresponding to the expansion / contraction region 10 (extension region 12) on the peripheral surface of the processing roll 50 (hereinafter referred to as “extension region corresponding region”). 50A includes a sealing convex portion 54 as a convex portion 53 for forming the joint portion 36. The rotational axis direction CD and the circumferential direction of the processing roll 50 (the vertical direction in FIG. 7, the rotational direction shown in FIG. 1). A plurality of intermittently arranged in both directions (the same direction as R1) and a region corresponding to the non-stretchable region 11 on the peripheral surface of the processing roll 50 (hereinafter also referred to as “non-stretchable region corresponding region”) 50B At least one cutting projection 55 as the projection 53 for forming the cutting portion 37 of the elastic member 33 is arranged on the extension line when the sealing projection 54 is virtually extended in the rotation axis direction CD. Has been. In this embodiment, as shown in FIG. 7, a plurality of cutting projections 55 are intermittently arranged in both the rotational axis direction CD and the circumferential direction in the non-stretchable region corresponding region 50B.

  Further, a cutting convex portion as a convex portion 53 for forming the cutting portion 38 of the leg elastic member 34 separately from the cutting convex portion 55 at the central portion of the peripheral surface of the processing roll 50 in the rotation axis direction CD. A plurality of 56 are intermittently arranged in the circumferential direction.

  Further, as shown in FIG. 7, the non-stretchable region corresponding region 50 </ b> B is virtually extended on the peripheral surface of the work roll 50 in the rotation axis direction CD (direction orthogonal to the extending direction of the elastic member 33). There is a stretchable region corresponding region 50A that overlaps the region 50C. This extension region 50C is a region corresponding to the extension region 12 of the diaper 1 as the manufacturing object, and is a part of the expansion / contraction region corresponding region 50A, in which the sealing convex portion 54 is in both the rotational axis direction CD and the circumferential direction. Are intermittently arranged. The non-stretchable region corresponding region 50B where the cutting convex portion 55 is disposed and the extended region 50C where the sealing convex portion 54 is disposed are in the same position in the circumferential direction of the processing roll 50, and are a workpiece. It exists in the same position as conveyance direction MD of the exterior body precursor 30. FIG.

  The sealing convex portion 54 is a portion that forms the joint portion 36 between the outer layer sheet 31 and the inner layer sheet 32, and may have a configuration capable of fulfilling such a role. For example, a conventionally known heat emboss pin Ultrasonic emboss spin can be used. Further, the cutting convex portions 55 and 56 are portions that prevent the contraction force of the elastic members 33 and 34 that are fixed in an extended state between the sheets 31 and 32 from being developed, and have a configuration that can fulfill such a role. For example, a cutter blade that divides the elastic members 33 and 34 may be provided.

  In the conventional manufacturing method of a pants-type disposable diaper, the pattern shown in FIG. 11 is employed as the pattern of the convex portion 53 on the peripheral surface of the processing roll 50 having the basic configuration as described above. In the pattern of the protrusions 53 shown in FIG. 11, a plurality of seal protrusions 54 are arranged along the rotation axis direction CD (direction orthogonal to the expansion / contraction direction of the elastic member 33) in the extended region 50C. A plurality of rows 54Lx are provided at intervals in the rotation direction R1 (circumferential direction, conveyance direction MD) of the processing roll 50, and a plurality of cuts are made along the rotation axis direction CD in the non-stretchable region corresponding region 50B. A plurality of cutting convex row 55Lx, in which the convex portions 55 are arranged, are provided at intervals in the rotation direction R1. Each convex portion 53 has a rectangular shape in plan view, and the longitudinal direction thereof coincides with the rotation axis direction CD. Further, the front end 54a in the rotation direction R1 (the end on the downstream side of the rotation direction R1) of each seal projection 54 in the extension region 50C and the rotation direction R1 in each cut projection 55 in the non-stretchable region corresponding region 50B. The front end 55a (the end on the downstream side in the rotational direction R1) is not located at the same position in the rotational direction R1, but is shifted. In addition, in FIG. 11 and FIGS. 8-10 mentioned later, about the convex part 53 located in the forefront of rotation direction R1, the straight line extended in rotation axis direction CD along those front ends 54a and 55a is described. However, this straight line is for facilitating understanding of the technical contents and is not related to the actual apparatus configuration.

And in the manufacturing method of the conventional pants type disposable diaper which employ | adopted the pattern of the convex part 53 shown in FIG. 11, there existed the subject of following 1) and 2) as mentioned above. In particular, the bonding failure between the two sheets 31 and 32 in the stretchable region 10 is serious, and it has been difficult to find manufacturing conditions for achieving both the following problems 1) and 2).
1) The formation of the stretchable region 10 is hindered due to insufficient formation of the joint 36 formed by pressing the laminate of the outer layer sheet 31 and the inner layer sheet 32 by the sealing convex portion 54 in the extended region 50C. This causes inconvenience such as floating of the sheets 31 and 32.
2) About the cutting part 37 formed by the pressing with respect to the waist elastic member 33 by the cutting convex part 55 existing in the non-stretchable region corresponding region 50B, the formation of the non-stretchable region 11 is hindered due to insufficient formation. This causes inconveniences such as undesirable vertical wrinkles occurring in the absorbent main body 2 disposed so as to overlap the non-stretchable region 11.

  On the other hand, in the manufacturing method of the underpants type disposable diaper of this embodiment, the pattern shown in FIG. 8 is employ | adopted as a pattern of the convex part 53 in the surrounding surface of the processing roll 50, and, thereby, said 1) and 2) We are trying to solve the problem. The pattern of the convex part 53 in this embodiment has the front end 54a in the rotational direction R1 in each sealing convex part 54 existing in the extended region 50C and the rotational direction R1 in each cutting convex part 55 existing in the non-stretchable region corresponding region 50B. This is different from the conventional manufacturing method in which both front ends 54a and 54b are displaced in the rotation direction R1 in that the front end 55a is in the same position in the rotation direction R1. With such a configuration, in the exterior body precursor 30 that is the workpiece, the formation planned site of the extension region 12 that is the stretchable region 10 and the planned formation site of the non-stretchable region 11 are along the rotation axis direction CD of the processing roll 50. Even in the case where they are lined up, the joint body 36 is formed at the site where the extension region 12 is to be formed simply by supplying the exterior body precursor 30 between the processing roll 50 and the anvil roll 60 according to a conventional method. The cutting part 37 can be formed in the non-stretchable region 11. That is, the manufacturing method of the underpants type disposable diaper of this embodiment is compatible with the formability of the junction part of sheets, and the cutting property of the elastic member distribute | arranged to the sheet | seat at a high level.

More specifically, as shown in FIG. 8, the pattern of the convex portion 53 in the present embodiment has a plurality of seals along the rotation axis direction CD (direction orthogonal to the expansion / contraction direction of the elastic member 33) in the extension region 50 </ b> C. A plurality of rows of seal projections 54Lx in which the projections 54 for use are arranged are provided at intervals in the rotation direction R1 (circumferential direction, conveyance direction MD) of the processing roll 50, and each of the seal projections 54Lx in the seal projection row 54Lx is provided. Each of the sealing convex portions 54 has the front end 54a in the rotation direction R1 at the same position in the rotation direction R1. Then, the front end 54a (the end on the downstream side in the rotation direction R1) of the processing roll 50 in each sealing projection 54 in the sealing projection row 54Lx and the rotational axis direction CD of the sealing projection row 54Lx. The front end 55a in the rotation direction R1 (the end portion on the downstream side of the rotation direction R1) of the cutting projection 55 existing on the extended line is in the same position in the rotation direction R1.
In the present embodiment, in the non-stretchable region corresponding region 50B, a plurality of cutting projection rows 55Lx in which a plurality of cutting projections 55 are arranged along the rotation axis direction CD are spaced apart in the rotation direction R1. A column is provided. Each cutting protrusion 55 in the cutting protrusion row 55Lx has the front end 55a in the rotation direction R1 (the end on the downstream side in the rotation direction R1) at the same position in the rotation direction R1. Then, the front end 54a (the end on the downstream side in the rotation direction R1) of the processing roll 50 in each sealing projection 54 in the sealing projection row 54Lx and the rotational axis direction CD of the sealing projection row 54Lx. The front end 55a in the rotation direction R1 (the end on the downstream side in the rotation direction R1) of each of the cutting projections 55 in the cutting projection row 55Lx existing on the extension line is in the same position in the rotation direction R1. .
In each of the extended region 50C and the non-stretchable region corresponding region 50B, each convex portion 53 has a rectangular shape in plan view, and the longitudinal direction thereof coincides with the rotation axis direction CD.

  In the present embodiment, as shown in FIG. 8, the seal projection 54 is on an extension line (not shown) when the seal projection 54 is virtually extended in the rotation axis direction CD. The cutting projection 55 has the same length L1 in the rotation direction R1 (the same direction as the lateral direction Y of the diaper 1). In the present embodiment, the sealing convex portion 54 and the cutting convex portion 55 on the extension line thereof are not only the length L1 in the rotational direction R1, but also the rotational axis direction that is a direction orthogonal to the rotational direction R1. The length L2 of CD (the same direction as the longitudinal direction X of the diaper 1) is also the same.

  Further, in this embodiment, as shown in FIG. 8, the cutting projection row 55Lx of the non-stretchable region corresponding region 50B and the extension region (the diaper 1 of the diaper 1) at the same position as the non-stretchable region corresponding region 50B in the rotation direction R1. The same number of sealing convex rows 54Lx of 50C (region corresponding to the extended region 12) is arranged in the rotation direction R1.

From the viewpoint of achieving both the above-described operational effects, that is, the formability of the joint portion 36 and the cutting of the waist elastic member 33 (formation of the cutting portion 37) at a higher level, the dimensions and the like of the respective portions of the processing roll 50 are as follows. It is preferable to set as follows.
The length L1 (see FIG. 8) of the rotation direction R1 (conveyance direction MD) of the convex portion 53 (including the sealing convex portion 54 and the cutting convex portion 53, hereinafter the same unless otherwise specified) is preferably 0.00. It is 1 mm or more, more preferably 0.3 mm or more, and preferably 1.0 mm or less, more preferably 0.5 mm or less.
The length L2 (see FIG. 8) of the convex portion 53 in the rotation axis direction CD is preferably 0.1 mm or more, more preferably 1.0 mm or more, and preferably 2.0 mm or less, more preferably 1.5 mm or less. It is.
The protrusion height of the convex portion 53 from the peripheral surface of the processing roll 50 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 1.0 mm or less, more preferably 0.5 mm or less. .

The distance L3 (see FIG. 8) between the two convex portions 53, 53 adjacent in the rotation direction R1 is preferably 5 mm or more, more preferably 7 mm or more, and preferably 10 mm or less, more preferably 8 mm or less.
The distance L4 (see FIG. 8) between the two convex portions 53, 53 adjacent to each other in the rotation axis direction CD is preferably 3 mm or more, more preferably 4 mm or more, and preferably 10 mm or less, more preferably 6 mm or less. .
The number of convex portions 53 existing in an arbitrary 1 cm square region is preferably 2 or more, more preferably 4 or more, and preferably 8 or less, more preferably 6 or less.

  9 and 10 show another pattern of the convex portion 53 that can be applied to the processing roll 50. FIG. Regarding other embodiments to be described later, components different from those of the above embodiments will be mainly described, and the same components are denoted by the same reference numerals and description thereof will be omitted. For the components that are not particularly described, the description of the embodiment is applied as appropriate.

  In the pattern of the convex portion 53 shown in FIG. 9, the length L1 in the rotational direction R1 of the cutting convex portion 55 in the non-stretchable region corresponding region 50B, and the length in the rotational direction R1 of the sealing convex portion 54 in the extended region 50C. L1 is different and the former is longer. The ratio of both lengths is preferably 0.5 or more, more preferably 0.7 or more, and preferably 1. or more as the length L1 of the cutting projection 55 / the length L1 of the sealing projection 54. 2 or less, more preferably 1.0 or less. Even when the pattern of the convex portion 53 shown in FIG. 9 is adopted, the same effect as that obtained when the pattern of the convex portion 53 shown in FIG. Especially when the pattern of the convex part 53 shown in FIG. 9 is employ | adopted, the impact force produced between the processing roll 50 and the anvil roll 60 at the time of a process can be relieve | moderated further.

  In the pattern of the protrusions 53 shown in FIG. 10, the number of cutting protrusions 55 in the rotation direction R1 of the non-stretchable region corresponding region 50B is larger than the number of seal protrusions 54 in the rotation direction R1 of the extension region 50C. And few. In the pattern of the convex portion 53 shown in FIG. 10, the cutting convex portion 55 of the non-stretchable region corresponding region 50B extends when the sealing convex portion 54 of the extended region 50C is virtually extended in the rotation axis direction CD. Only one is arranged on a line (not shown). The pattern of the cutting convex portion 55 is such that one cutting convex portion 55 is arranged for one of the waistline elastic members 33 to be cut. Even when the pattern of the convex portion 53 shown in FIG. 10 is adopted, the same effect as that obtained when the pattern of the convex portion 53 shown in FIG. Especially when the pattern of the convex part 53 shown in FIG. 10 is employ | adopted, the expansion-contraction area | region 10 can be formed much more stably.

  Although the embodiment described above relates to a method for manufacturing an absorbent article, these embodiments can also be applied to a method for manufacturing an elastic sheet. The term “expandable sheet” as used herein means “a plurality of joint portions each having two sheets facing each other and a plurality of elastic members fixed in an extended state between the two sheets, and both sheets being intermittently arranged. A stretchable region joined to each other and a plurality of the elastic members extending in one direction without passing through the joint, and a non-stretchable region having a lower stretchability than the stretchable region by cutting the elastic member And the non-stretchable region has a stretchable region that overlaps with the stretched region when the non-stretchable region is virtually extended in a direction orthogonal to the stretch direction of the elastic member. This is substantially the same as the outer package 3 in the diaper 1 of the above embodiment.

  The stretchable sheet produced by the production method of the present invention is not limited to the waist part of the pants-type disposable diaper, for example, the waist part of the unfolded disposable diaper, the pants-type sanitary napkin, the disposable underwear, and the ear hook of the disposable mask. It can also be used for parts, cleaning sheets, bandages and the like.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be changed as appropriate. All the parts of only one embodiment described above can be used as appropriate.

1 Pants-type disposable diaper (absorbent article)
A Abdominal side B Crotch C Back side S Side seal part 2 Absorbent body 21 Top sheet 22 Back sheet 23 Absorber 24 Leak-proof cuff 3 Exterior body (elastic sheet)
31 outer layer sheet 32 inner layer sheet 33 waist elastic member 34 leg elastic member 35 ３６ 36 joint portion between outer layer sheet and inner layer sheet 37 cut portion of waist elastic member 38 cut portion of leg elastic member 10 stretchable region 11 non-stretchable region 12 Extension area (stretchable area)
20 Diaper continuum 30 Exterior body precursor (expandable sheet precursor)
40 Adhesive coating machine 50 Processing roll 50A Stretchable region corresponding region 50B Non-stretchable region corresponding region 50C Extension region (stretchable region corresponding region)
51 Rotating shaft 52 Rotating body 53 Convex portion 54 Sealing convex portion 54a Rotational front end of sealing convex portion 55, 56 Cutting convex portion 55a Rotating front end of cutting convex portion 60 Anvil roll 61 Rotating shaft 62 Rotating body

Claims (7)

Two sheets facing each other, and a plurality of elastic members fixed in an extended state between the two sheets, the sheets being joined to each other at a plurality of joint portions in which the sheets are intermittently arranged, and the plurality of elastic members Has a stretchable region that extends in one direction without passing through the joint portion, and a non-stretchable region that is cut and has a lower stretchability than the stretchable region when the elastic member is cut. A stretchable sheet manufacturing method in which the stretchable region is arranged at a position overlapping with the extended region when virtually extending in a direction orthogonal to the extending direction of the member,
An elastic sheet precursor in which a plurality of elastic members are fixed in an extended state between two sheets is caused to travel along the extending direction of the elastic member, and a processing roll having a protruding portion formed on the peripheral surface and the processing By passing between an anvil roll disposed opposite to the roll, the step of forming the joint portion corresponding to the pattern of the convex portion and the cut portion of the elastic member in the stretchable sheet precursor,
A plurality of sealing convex portions as the convex portions for forming the joint portion are intermittently provided in both the rotation axis direction and the circumferential direction of the processing roll in a region corresponding to the expansion and contraction region on the peripheral surface of the processing roll. As well as
In a region corresponding to the non-stretchable region on the peripheral surface of the processing roll, a cutting convex portion as the convex portion for forming the cutting portion is virtually disposed in the direction of the rotation axis. At least one is arranged on the extension line when extended,
The front end in the rotational direction of the work roll in the sealing convex portion and the front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex portion are in the same position in the rotational direction. A method for producing an elastic sheet.   The method for producing an elastic sheet according to claim 1, wherein the sealing convex portion and the cutting convex portion on the extension line have the same length in the rotational direction. A seal convex row in which a plurality of the seal convex portions are arranged along the rotation axis direction of the processing roll in a region corresponding to the expansion / contraction region on the peripheral surface of the processing roll is a circumferential direction of the processing roll. Multiple rows are provided at intervals,
A front end in the rotational direction of the processing roll in each of the sealing convex portions in the sealing convex row, and a front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex row. The manufacturing method of the elastic sheet according to claim 1 or 2, which is in the same position in the rotation direction. A cutting projection row in which a plurality of cutting projections are arranged along the rotation axis direction of the processing roll in a region corresponding to the non-stretchable region on the peripheral surface of the processing roll is a periphery of the processing roll. Multiple rows are provided at intervals in the direction,
The front end in the rotational direction of the processing roll in each of the sealing convex portions in the sealing convex row, and the front end in the rotational direction in each of the cutting convex portions in the cutting convex row, The manufacturing method of the elastic sheet of Claim 3 which exists in the same position in a rotation direction.   In the rotation direction, the cutting projection row in a region corresponding to the non-stretchable region on the peripheral surface of the processing roll and the sealing projection row in a region corresponding to the extension region with respect to the non-stretchable region are in the rotation direction. The manufacturing method of the elastic sheet of Claim 4 arrange | positioned by the same number. The absorbent body has a longitudinal direction corresponding to the longitudinal direction of the wearer and a transverse direction perpendicular thereto, and includes an absorbent main body including a liquid-retaining absorbent at the lateral center, and the non-skin facing surface of the absorbent main body The outer body arranged on the side and both side edges along the longitudinal direction of the outer body in the front body and the back body are joined together to form a pair of side seal parts, a waist opening part, and a pair of leg openings. Is an absorbent article,
The exterior body includes two sheets facing each other and a plurality of elastic members fixed in an extended state between the two sheets, and the sheets are joined to each other at a plurality of joint portions in which the sheets are intermittently arranged. A plurality of elastic members extending in a lateral direction without passing through the joint portion; and a non-stretchable region having a lower elasticity than the elastic region when the elastic member is cut, A method for manufacturing an absorbent article, wherein the stretchable region is disposed at a position overlapping the stretched region when the stretchable region is virtually extended in the longitudinal direction,
An exterior body precursor in which a plurality of elastic members are fixed in a stretched state between two sheets is run along the extending direction of the elastic members, and a processing roll having protrusions formed on the peripheral surface and the processing By passing between the anvil roll disposed opposite to the roll, the outer body precursor includes the step of forming the joint portion corresponding to the pattern of the convex portion and the cut portion of the elastic member,
A plurality of sealing convex portions as the convex portions for forming the joint portion are intermittently provided in both the rotation axis direction and the circumferential direction of the processing roll in a region corresponding to the expansion and contraction region on the peripheral surface of the processing roll. As well as
In a region corresponding to the non-stretchable region on the peripheral surface of the processing roll, a cutting convex portion as the convex portion for forming the cutting portion is virtually disposed in the direction of the rotation axis. At least one is arranged on the extension line when extended,
The front end in the rotational direction of the work roll in the sealing convex portion and the front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex portion are in the same position in the rotational direction. Manufacturing method of absorbent article. Two sheets facing each other, and a plurality of elastic members fixed in an extended state between the two sheets, the sheets being joined to each other at a plurality of joint portions in which the sheets are intermittently arranged, and the plurality of elastic members Has a stretchable region that extends in one direction without passing through the joint portion, and a non-stretchable region that is cut and has a lower stretchability than the stretchable region when the elastic member is cut. An apparatus for producing an expandable sheet, wherein the stretchable region is arranged at a position overlapping with the extended region when virtually extending in a direction orthogonal to the direction of extension of the member,
It has a processing roll having protrusions formed on the peripheral surface and an anvil roll disposed opposite to the processing roll, and a plurality of elastic members are fixed in an extended state between the two sheets between the two rolls. By supplying the stretchable sheet precursor, the stretchable sheet precursor can be formed with the joint portion corresponding to the pattern of the convex portion and the cut portion of the elastic member,
A plurality of sealing convex portions as the convex portions for forming the joint portion are intermittently provided in both the rotation axis direction and the circumferential direction of the processing roll in a region corresponding to the expansion and contraction region on the peripheral surface of the processing roll. As well as
In a region corresponding to the non-stretchable region on the peripheral surface of the processing roll, a cutting convex portion as the convex portion for forming the cutting portion is virtually disposed in the direction of the rotation axis. At least one is arranged on the extension line when extended,
The front end in the rotational direction of the work roll in the sealing convex portion and the front end in the rotational direction in the cutting convex portion on the extension line of the sealing convex portion are in the same position in the rotational direction. Telescopic sheet manufacturing equipment.

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