JP2022054154A - Cutter device and method for manufacturing underwear type absorbent article - Google Patents

Abstract

To provide a technology that when a portion of a continuum of a plurality of articles for wearing is removed during transportation in its continuous direction and opening edge parts for leg opening parts are formed on both sides of the removed portion, is capable of forming the opening edge parts so as to be symmetric as designed.SOLUTION: A cutter blade 57 has a projected curved part 60 that intersects one side edge 120 along a transportation direction MD of a continuous sheet, a cutting target, at two intersection points A1, A2 and projects on the side opposite to the one side edge 120 side in a plan view. One side 60A and the other side 60B of the projected curved part 60 are asymmetric on the basis of a transportation direction center line CLm passing through the middle point P of the two intersection points A1, A2 and extending in a transportation orthogonal direction CD.SELECTED DRAWING: Figure 6

Description

The present invention relates to a cutter device used to form a leg opening at the time of manufacturing a worn article having a leg opening such as a disposable diaper, and a method for manufacturing a pants-type absorbent article using the cutter device.

A pants-type absorbent article, which is a type of worn article, typically includes a front body including a ventral portion arranged on the ventral side of the wearer and a dorsal portion arranged on the dorsal side of the wearer. It has a back body and a pair of leg openings through which both legs of the wearer can pass through the inseam, which is arranged in the crotch part of the wearer, and has a pants-type shape. Further, in such a method for manufacturing a pants-type absorbent article, typically, a plurality of absorbent articles are formed in one direction to form an absorbent article continuum, and the absorbent article continuum is formed in the continuous direction thereof. Includes a step of excising a portion of the absorbent article continuum to form a leg opening while transporting along.

A rotary cutter device is known as a device for forming a leg opening. The rotary cutter device is typically an anvil roll having a cutter roll provided with a cutter blade protruding from the outer peripheral surface and a planar receiving portion arranged opposite to the outer peripheral surface of the cutter roll and receiving the cutter blade. It is composed including and. By passing an object to be cut such as the absorbent article continuum between these two rolls, a part of the object to be cut is cut, and the object to be cut is cut. Patent Document 1 describes an improved technique of a rotary cutter device (leg circumference forming device) for forming a leg opening of an absorbent article.

In Patent Document 2, when a composite sheet in which a stretchable sheet and a low stretchable sheet having a lower extensibility are laminated is used as a constituent member of an absorbent article, a rotary cutter is used for the composite sheet. It is described that when a leg opening is formed by using an apparatus, there is a problem that the composite sheet cannot be cut as designed, such as an uncut portion due to the elasticity of the elastic sheet (patented). (Refer to [0006] to [0008], etc. of Document 2), as a cutter device capable of solving this problem, a cutter blade that abuts on the composite sheet from the stretchable sheet side and the composite sheet from the low extensibility sheet side. It is described that the cutter blade has a surface-shaped receiving portion that receives the cutter blade while being in contact with the cutter blade. Patent Document 2 does not describe devising the shape of the cutter blade in order to solve the above problem.

Japanese Unexamined Patent Publication No. 2010-227544 JP-A-2015-186548

In the step of transporting a continuum of worn articles such as the absorbent article continuum along the continuous direction and cutting a part of the continuum to form a leg opening, the continuous body is transported in the transport direction. A predetermined portion to be excised that straddles the boundary between two adjacent worn articles is excised, thereby simultaneously forming an opening edge (leg edge) of a leg opening on one side of each of the two worn articles. The two leg edges formed are usually required to be symmetrical in the transport direction with respect to their boundaries. However, depending on the configuration of the continuum of the worn article, the elasticity, the position of the portion to be excised, and the like, it may be difficult to form a plurality of adjacent leg edges in the transport direction symmetrically as designed. No technology has yet been provided that can solve this problem.

An object of the present invention is to cut a part of a continuum of a plurality of worn articles while transporting them in the continuous direction, and to form opening edges of leg openings on both sides of the cut portion. It relates to providing a technique capable of forming the opening edges of the above symmetrically as designed.

According to the present invention (first invention), at the time of manufacturing a worn article having a pair of leg openings through which both legs of the wearer are passed, the members constituting the front body of each of the plurality of worn articles are connected in one direction. The first continuous sheet having elasticity in one direction is transported in a transport direction parallel to the one direction, and the members constituting the rear body of each of the plurality of worn articles are connected in one direction and in the one direction. The elastic second continuous sheet is conveyed in the same direction as the first continuous sheet at a predetermined interval in the transfer orthogonal direction orthogonal to the transfer direction with respect to the first continuous sheet, and the two continuous sheets are conveyed. During transport, from at least one of the two continuous sheets, a portion to be excised having a shape that straddles the boundary between the two worn articles in a plan view in the transport direction and is symmetrical in the transport direction with respect to the boundary. A cutter device used to cut and simultaneously form one of the pair of leg openings in each of the two worn articles.
In one embodiment of the cutter device of the present invention (first invention), the cutter blade is provided on the outer peripheral surface, and the cutter blade is rotated around a rotation axis on one surface of the continuous sheet having the cut target portion. It has a cutter roll to be abutted and a receiving portion for receiving the cutter blade while abutting on the other surface of the continuous sheet.
In one embodiment of the cutter device of the present invention (first invention), the cutter blade intersects one side edge of the continuous sheet along the transport direction at two intersections, and in a plan view, the cutter blade intersects with the one side edge side. Has a convex curved portion that is convex on the opposite side.
In one embodiment of the cutter device of the present invention (first invention), the convex curved portion is connected to one side with respect to a transport direction center line extending in the transport orthogonal direction through the midpoint of the two intersections. The other side is asymmetric.

Further, the present invention (second invention) constitutes a wearable article continuum in which a plurality of the worn articles are connected in one direction at the time of manufacturing the worn article having a pair of leg openings through which both legs of the wearer are passed. While transporting the continuous sheet having elasticity in one direction in the transport direction parallel to the one direction, the boundary between the two worn articles in a plan view is straddled in the transport direction and the boundary is reached. A cutter device used to cut a portion to be cut that has a shape symmetrical with respect to the transport direction and simultaneously forms one of the pair of leg openings of each of the two worn articles. be.
In one embodiment of the cutter device of the present invention (second invention), a cutter roll having a cutter blade on an outer peripheral surface and bringing the cutter blade into contact with one surface of the continuous sheet while rotating the cutter blade around a rotation axis. It has a receiving portion that receives the cutter blade while abutting on the other surface of the continuous sheet.
In one embodiment of the cutter device of the present invention (second invention), the cutter blade has a closed shape in a plan view, and has a midpoint between the frontmost point and the rearmost point in the rotation direction of the cutter blade. One side and the other side are asymmetric with respect to the transport direction center line extending in the transport orthogonal direction through the transport.

Further, the present invention has an absorbent body having a vertical direction extending from the ventral side of the wearer to the dorsal side through the crotch portion and a lateral direction orthogonal to the vertical direction, and includes an absorbent body that absorbs and retains body fluid. A pair of side seal portions, which are provided with an exterior body arranged on the non-skin facing surface side of the absorbent body, and both side portions of the exterior body along the vertical direction of the front body and the back body are joined to each other. A method for manufacturing a pants-type absorbent article in which a waist opening and a pair of leg openings are formed.
In one embodiment of the method for manufacturing a pants-type absorbent article of the present invention, a first continuous sheet in which members constituting the front body of each of the plurality of absorbent articles are connected in one direction and has elasticity in the one direction is provided. A second continuous sheet, in which the members constituting the back body of each of the plurality of absorbent articles are connected in one direction and have elasticity in the one direction, while being conveyed in the transport direction parallel to the one direction. The absorbent body is transported in the same direction as the first continuous sheet at a predetermined interval in the transport orthogonal direction orthogonal to the transport direction with respect to one continuous sheet, and is placed on one surface of both continuous sheets being transported. Is intermittently placed in both continuous sheets in the transport direction to form an absorbent article continuum.
In one embodiment of the method for manufacturing a pants-type absorbent article of the present invention, two of the above in plan view from at least one of the first continuous sheet and the second continuous sheet before or after the arrangement of the absorbent body. The pair of the two absorbent articles is cut by a cutter device and has a shape that straddles the boundary between the absorbent articles in the transport direction and has a shape symmetrical to the transport direction with respect to the boundary. It has a leg opening forming step of forming one of the leg openings at the same time.
In one embodiment of the method for manufacturing a pants-type absorbent article of the present invention, the cutter device has a cutter blade on an outer peripheral surface, and the cutter blade is rotated around a rotation axis on one surface of the continuous sheet. It has a cutter roll to be abutted and a receiving portion for receiving the cutter blade while abutting on the other surface of the continuous sheet.
In one embodiment of the method for manufacturing a pants-type absorbent article of the present invention, the cutter blade intersects one side edge of the continuous sheet along the transport direction at two intersections, and the one side edge side in a plan view. It has a convex curved portion that is convex on the opposite side to the above.
In one embodiment of the method for manufacturing a pants-type absorbent article of the present invention, the convex curved portion is unilateral with reference to a transport direction center line extending in the transport orthogonal direction through the midpoint of the two intersections. And the other side are asymmetric.
Other features, effects and embodiments of the invention are described below.

According to the present invention, when a continuum of a plurality of worn articles is partially excised during transportation in the continuous direction, and the opening edges of the leg openings are formed on both sides of the excised portion, they are formed. A technique is provided in which the open edges of the above can be formed symmetrically as designed.

FIG. 1 is a schematic perspective view of a pants-type absorbent article which is an embodiment of a worn article manufactured by the present invention (first invention). FIG. 2 is a developed plan view schematically showing a skin-facing surface (arrangement side of the absorbent body) in the unfolded and stretched state of the diaper shown in FIG. FIG. 3 is a schematic exploded perspective view of the diaper shown in FIG. FIG. 4 is a perspective view schematically showing a schematic configuration of the diaper production line shown in FIG. 1. 5A and 5B are views showing a leg opening forming step in the diaper manufacturing process shown in FIG. 4, FIG. 5A is a perspective view of an embodiment of the cutter device of the present invention, and FIG. 5B is a perspective view. It is a top view schematically showing how the part to be cut is cut from a continuous sheet by the cutter device, omitting the cutter device. FIG. 6 is a schematic plan view of a cutter blade in the cutter roll when the cutter device shown in FIG. 5A is viewed from the cutter roll side. FIG. 7 is an explanatory diagram of an approximate arc of each part of the cutter blade shown in FIG. FIG. 8 is a schematic perspective view of a pants-type absorbent article which is another embodiment of the worn article manufactured by the present invention (second invention). 9 is a diagram showing a leg opening forming step in the diaper manufacturing process shown in FIG. 8, and FIG. 9 (a) is a perspective view of another embodiment of the cutter device of the present invention, FIG. 9 (b). ) Is a plan view schematically showing how the cutter device cuts the cut target portion from the continuous sheet, omitting the cutter device. FIG. 10 is a schematic plan view (corresponding to FIG. 6) of the cutter blade in the cutter roll when the cutter device shown in FIG. 9A is viewed from the cutter roll side. FIG. 11 is an explanatory diagram (corresponding to FIG. 7) of an approximate arc of each part of the cutter blade shown in FIG.

Hereinafter, the present invention will be described based on the preferred embodiment thereof with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. The drawings are basically schematic, and the ratio of each dimension may differ from the actual one.

The cutter device of the present invention is used to form a leg opening in the manufacture of a worn article having a pair of leg openings through which both legs of the wearer are passed.
1 to 3 show a pants-type disposable diaper 1 which is an embodiment of a pants-type absorbent article which is a kind of worn articles to which the present invention (first invention) is applied.

The diaper 1 has a vertical direction X corresponding to the front-back direction of the wearer, that is, a direction extending from the ventral side to the dorsal side through the crotch portion, and a horizontal direction Y orthogonal to the vertical direction X, and absorbs and retains body fluid. The absorbent body 2 including the absorbent body 22 and the outer body 4 arranged on the non-skin facing surface side of the absorbent main body 2 are provided, and the vertical direction X of the outer body 4 in each of the front body F and the back body R is provided. Both side portions 4S are joined to each other to form a pair of side seal portions S, S, a waist opening WH, and a pair of leg openings LH, LH. A pair of leak-proof cuffs 3 and 3 that stand up on the wearer's skin side when the diaper 1 is worn are provided on both sides of the absorbent body 2 along the vertical direction X.

In the present specification, the "skin facing surface" is a surface of the absorbent article or a component thereof (for example, an absorbent body) that is directed toward the wearer's skin side when the absorbent article is worn, that is, relative to the wearer's skin. The "non-skin facing surface" is the surface of the absorbent article or its constituents that faces the opposite side of the skin when the absorbent article is worn, that is, relative to the wearer's skin. The distant side. The term "when worn" as used herein means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained.

The diaper 1 is arranged in the crotch part of the wearer, and includes the inseam B including the part facing the excretion part (not shown) facing the excretion part such as the wearer's penis, and the wearer's ventral side of the crotch part B. It is divided into three parts: a ventral part A arranged on the (front side) and a dorsal part C arranged on the back side (rear side) of the wearer rather than the inseam B. The diaper 1 is formed symmetrically on one side and the other side with the horizontal center line CLy (see FIG. 2) in between. The ventral part A is a part of the front body F of the diaper 1, and the dorsal part C is a part of the back body R of the diaper 1. The inseam B straddles the vertical center line CLx (see FIG. 2) in the vertical direction X, and exists from the front body F to the back body R.
The horizontal center line CLy is a virtual straight line extending in the vertical direction X by bisecting the expanded and extended diaper 1 in the horizontal direction Y as shown in FIG. The vertical center line CLx is a virtual straight line that bisects the expanded and extended diaper 1 in the vertical direction X and extends in the horizontal direction Y.
The "expanded and extended state" means that the diaper 1 is separated by the side seal portion S to be in the expanded state, and the elastic member of each portion is extended to remove the influence of the elastic member. It refers to the state in which it is expanded to the size) when it is expanded in a flat state.
In the present invention, the ventral portion A, the inseam B, and the dorsal portion C can be each region when the unfolded and extended diaper 1 is divided into three equal parts in the vertical direction X.

In the present embodiment, as shown in FIG. 2, the absorbent main body 2 has a rectangular shape in a plan view, the longitudinal direction thereof coincides with the vertical direction X of the diaper 1, and the center of the lateral direction Y of the exterior body 4. It is arranged in a portion and extends in the vertical direction X from the ventral portion A to the dorsal portion C via the inseam B. The contour of the absorbent body 2 in a plan view coincides with the contour of the absorbent body 22.
The absorbent body 2 is a liquid-permeable surface sheet 21 arranged at a position relatively close to the wearer's skin, and a liquid-impermeable or impermeable surface sheet placed at a position relatively far from the wearer's skin. It is composed of a back sheet (not shown) having a property or water repellency (that is, leak-proof), and an absorber 22 interposed between the sheets.
The absorber 22 includes an absorbent core (not shown) capable of absorbing and retaining body fluid, and a core wrap sheet (not shown) that covers the outer surface of the absorbent core including the skin facing surface and the non-skin facing surface. It is composed of including.
These members constituting the absorbent main body 2 are integrated by a known joining means such as an adhesive.
As the above-mentioned members constituting the absorbent main body 2, those usually used in this kind of absorbent article can be used without particular limitation. For example, various non-woven fabrics, perforated films and the like can be used as the front surface sheet 21, and a resin film or a laminate of a resin film and a non-woven fabric or the like can be used as the back surface sheet. The absorbent core is typically mainly composed of a water-absorbent material, and contains one or more selected from a fiber material such as wood pulp and a water-absorbent polymer as the water-absorbent material. The core wrap sheet has liquid permeability and is typically made of paper, non-woven fabric or the like. The core wrap sheet may be omitted.

In the present embodiment, the exterior body 4 has a ventral exterior body 4A constituting the ventral side portion A and a dorsal exterior body 4C constituting the dorsal side portion C. Both exterior bodies 4A and 4C are separated from each other in the vertical direction X, and the absorbent main body 2 is bridged and fixed to both exterior bodies 4A and 4C.
The following description of the exterior body 4 applies to both exterior bodies 4A and 4C unless otherwise specified.

The ventral exterior body 4A has a rectangular shape in which the length of the diaper 1 in the horizontal direction Y is longer than that in the vertical direction X in a plan view in the expanded and extended state of the diaper 1 as shown in FIG.
On the other hand, the back side exterior body 4C has a side relatively far from the vertical center line CLx (a region existing at the same position in the side seal portion S and the vertical direction X) and the vertical center line CLx in the expanded and extended state of the diaper 1. The plan view shape is different from the side relatively close to the side, the former has a rectangular shape in which the length in the horizontal direction Y is longer than the vertical direction X in the plan view, and the latter has the length in the horizontal direction Y. (Width) changes in the vertical direction X, and more specifically, it gradually decreases toward the vertical center line CLx. The rectangular portion in the plan view of the dorsal exterior body 4C is arranged around the wearer's torso together with the rectangular portion in the plan view of the ventral exterior body 4A (in the present embodiment, the entire area of the ventral exterior body 4A). The waist circumference D is formed. The portion where the width of the dorsal exterior body 4C changes in the vertical direction X forms a part of the inseam B, and the side edge portions 4S and 4S along the vertical direction X are the leg openings LH, respectively. An open edge (hereinafter, also referred to as "leg edge") LS is formed.

As shown in FIG. 2, the exterior body 4 has a larger area than the absorbent main body 2 (absorbent body 22), and has an extending portion extending outward from the peripheral edge of the absorbent main body 2. The extending portion of the exterior body 4 from the peripheral edge of the absorbent body 2 is also referred to as a flap portion. Further, among the flap portions, the portions located on both side edges of the absorbent main body 2 along the vertical direction X and the portions located outside in the lateral direction Y with respect to the virtual extension line thereof are also referred to as side flap portions.

In the present embodiment, the exterior body 4 (ventral exterior body 4A, dorsal exterior body 4C) absorbs the outer layer sheet 41 arranged at a position relatively far from the absorbent body 2 as shown in FIG. The inner layer sheet 42 arranged at a position relatively close to the sex body 2 is included. Both sheets 41 and 42 are joined to each other and integrated by joining means such as adhesive and fusion. Except for the folded-out extending portion 41E described later, the outer layer sheet 41 is the outermost layer of the exterior body 4, forms the non-skin facing surface of the exterior body 4, forms the outer surface of the diaper 1, and also forms the inner layer sheet. Reference numeral 42 denotes the innermost layer of the exterior body 4, which forms the skin facing surface of the exterior body 4. The absorbent body 2 is joined to the skin-facing surface of the inner layer sheet 42.

As the outer layer sheet 41 and the inner layer sheet 42, non-woven fabrics and resin films produced by various manufacturing methods can be used, respectively. Examples of the non-woven fabrics include spunbonded non-woven fabrics, air-through nonwoven fabrics, needle punched nonwoven fabrics and the like. Both the sheets 41 and 42 may have a single-layer structure or a laminated structure in which two or more sheets are laminated. Further, both the sheets 41 and 42 may be elastic sheets having elasticity in the lateral direction Y, or may be non-expandable sheets having no elasticity. As an example of the stretchable sheet, "a large number of elastic filaments arranged so as to extend in one direction without intersecting each other, in a substantially non-stretched state, contain non-elastic fibers" described in JP-A-2009-61743. An example is an elastic sheet bonded to a stretchable non-woven fabric. For example, the outer layer sheet 41 can be used as this stretchable sheet, and the inner layer sheet 42 can be used as a non-stretchable sheet.

The waist peripheral portion D of each of the ventral exterior body 4A and the dorsal exterior body 4C, that is, the region existing at the same position in the vertical direction X with the side seal portion S has elasticity in the lateral direction Y. Specifically, a plurality of elastic members 5 around the waist are arranged between the outer layer sheet 41 and the inner layer sheet 42 constituting the exterior body 4 of the waist circumference D so as to be stretchable in the lateral direction Y. Due to the elastic elasticity of the elastic member 5, the waist circumference D has elasticity in the lateral direction Y.
The plurality of elastic members 5 around the waist extend in the lateral direction Y in the waist peripheral portion D, and are intermittently arranged in the vertical direction X. The waist circumference D is manufactured by fixing the elastic member 5 between the sheets 41 and 42 in a laterally extended state, and then releasing the elastic member 5 from the extended state. In the wearing state of the diaper 1, a plurality of folds (gathers) extending in the direction intersecting the elastic member 5 (vertical direction X) are formed on the surface of the waist circumference D due to the contraction of the elastic member 5.
The portion of the waist circumference D that overlaps with the absorber 22 (absorbent body 2) in a plan view is processed so that the elastic member 5 is not elastically stretchable because the elastic member 5 around the waistline is divided. Therefore, the portion does not have elasticity in the lateral direction Y.

In this embodiment, leg gathers are formed on the leg edge LS. The leg gather is configured to include the exterior body 4, and more specifically, a leg portion elastic member fixed to the dorsal exterior body 4C and the dorsal exterior body 4C and having a portion extending along the leg edge portion LS. It is configured to include 6. The leg gather is manufactured by fixing the elastic member 6 in the stretched state between the outer layer sheet 41 and the inner layer sheet 42 constituting the dorsal exterior body 4C, and then releasing the elastic member 6 from the stretched state. There is. In the wearing state of the diaper 1, the contraction of the elastic member 6 forms a substantially continuous annular leg gather on the leg edge LS.

Unless otherwise specified, various known materials usually used for this kind of absorbent article are used as materials for various elastic members in diaper 1, including the above-mentioned elastic members 31, 5 and 6 constituting the diaper 1. An elastic material can be used without particular limitation, and examples thereof include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, elastic polyolefin, and polyurethane. As the form of the elastic member, a thread-like (thread rubber, etc.) or string-like (flat rubber, etc.) having a rectangular, square, circular, polygonal cross section, or a multifilament type thread-like member is preferably used. can.

In the present embodiment, the outer layer sheet 41 of the ventral exterior body 4A and the dorsal exterior body 4C respectively extends outward from the end portion of the inner layer sheet 42 in the vertical direction X, as shown in FIGS. 2 and 3. It has a protrusion 41E. The extending portion 41E is folded back toward the inner layer sheet 42 side and covers the end portion of the absorbent main body 2 in the vertical direction X. The extension portion 41E folded back to the inner layer sheet 42 side is bonded to other members (inner layer sheet 42, absorbent main body 2, leak-proof sheet 30) facing the extension portion 41E by an adhesive.

Next, the method for producing the pants-type absorbent article of the present invention will be described with reference to the drawings, taking as an example the preferred method for producing the diaper 1 described above. FIG. 4 shows a schematic configuration of a manufacturing line for manufacturing diaper 1, and FIG. 5 shows a portion corresponding to a leg opening LH (leg opening LS) forming step (leg opening forming step) in the manufacturing line. It is shown.

In the method for manufacturing a pants-type absorbent article of the present invention, the first continuous sheet 11 is conveyed in the transport direction MD parallel to the continuous direction thereof, and the second continuous sheet 12 is conveyed in the transport direction with respect to the first continuous sheet 11. Conveying orthogonal to MD At a predetermined interval in the orthogonal direction CD, the CD is transported in the same direction as the first continuous sheet 11, that is, in the transport direction MD, and is transported to one surface (upper surface in FIG. 4) of both sheets 11 and 12 being transported. , The step of forming the diaper continuous body 13 which is an absorbent article (wearing article) continuous body by intermittently arranging the absorbent main body 2 in the transport direction MD and straddling the sheets 11 and 12 (continuous body). It has a forming step).

In the present embodiment, the transport direction MD corresponds to the horizontal direction Y of the diaper 1, and the transport orthogonal direction CD corresponds to the vertical direction X of the diaper 1. Further, unless otherwise specified, the rotation axes of various rolls such as the cutter roll 55 and the anvil roll 56, which will be described later, are parallel to the transport orthogonal direction CD and orthogonal to the transport direction MD.

In the first continuous sheet 11, the members constituting the front body F of each of the plurality of diapers 1 (absorbent articles), specifically, in the present embodiment, the ventral exterior body 4A are connected in one direction (horizontal direction Y). It has elasticity in the one direction, that is, the transport direction MD. The reason why the first continuous sheet 11 (the continuous body of the ventral exterior body 4A) has elasticity in the transport direction MD is mainly the elasticity of the waist circumference elastic member 5 arranged in the same direction MD in an extended state. It is due to.
Further, in the second continuous sheet 12, the members constituting the back body R of each of the plurality of diapers 1 (absorbent articles), specifically, in the present embodiment, the dorsal exterior body 4C is unidirectionally (horizontally Y). It is configured in a row and has elasticity in the one direction, that is, the transport direction MD. The reason why the second continuous sheet 12 (the continuous body of the dorsal exterior body 4C) has elasticity in the transport direction MD is mainly the elasticity of the waist circumference elastic member 5 arranged in the same direction MD in an extended state. It is due to.

Specifically, in the method of manufacturing the diaper 1, as shown in FIG. 4, first, the strip-shaped outer layer sheet 41 continuously supplied from the raw fabric roll (not shown) and the raw fabric roll (not shown). ), A plurality of elastic members around the waist and elastic members 6 for the legs are arranged between the strip-shaped inner layer sheets 42 in an elongated state extended to a predetermined elongation rate. At this time, the leg portion elastic member 6 is arranged while forming a predetermined leg circumference pattern via a known swing guide (not shown) that reciprocates perpendicularly to the transport direction MD. Further, on the strip-shaped outer layer sheet 41 and the strip-shaped inner layer sheet 42, before superimposing them, an adhesive coating machine (FIG. (Not shown) is applied with an adhesive such as a hot melt type adhesive.

Next, the strip-shaped outer layer sheet 41 and the strip-shaped inner layer sheet 42 in which the elastic members 5 and 6 are sandwiched between the nip roll pairs 51 are sent and pressed to pressurize the strip-shaped outer layer sheets 41, thereby having a plurality of elasticitys between the strip-shaped sheets 41 and 42. The members 5 and 6 form a strip-shaped exterior body 4 arranged in an extended state.
After that, the elastic member precut means 52 is used to divide the elastic member 5 at the position where the absorbent main body 2 is planned to be arranged in the exterior body 4 into a plurality of pieces so that the elastic member 5 does not exhibit the elastic elasticity. ..

Next, using the slitter 53, the strip-shaped exterior body 4 is divided into two in the transport orthogonal direction CD, and the first continuous sheet 11 (continuous body of the ventral exterior body 4A) and the second continuous sheet 12 (dorsal side) are divided into two. (Continuous body of exterior body 4C) is formed, and both sheets 11 and 12 are further separated from each other in the transport orthogonal direction MD by using widening means (not shown). Both sheets 11 and 12 thus separated are guided so as to be parallel to each other by a known means such as a guide roll.

Next, an adhesive such as a hot melt type adhesive is previously applied to the absorbent main body 2 manufactured in another step, and the absorbent main body 2 coated with the adhesive is shown in FIG. In addition, the absorbent main body 2 is rotated 90 degrees with respect to the transport direction, and is intermittently supplied to and fixed to both the strip-shaped sheets 11 and 12 being transported in a state parallel to each other, so that the plurality of diapers 1 are formed. A band-shaped diaper continuum 13 connected in the lateral direction Y is formed (continuum forming step). The adhesive for fixing the absorbent main body 2 to both sheets 11 and 12 may be applied in advance to the planned placement position of the absorbent main body 2 on both sheets 11 and 12 instead of the absorbent main body 2. ..

After that, in the outer layer sheets 41 of both sheets 11 and 12 (ventral exterior body 4A and dorsal exterior body 4C) of the diaper continuous body 13, the inner layer sheet 42 is outside from the end of the transport orthogonal direction CD (longitudinal direction X). The extending portion 41E extending toward the inner layer sheet 42 is folded back. As a result, as shown in FIG. 2, both ends of the transport orthogonal direction CD, that is, the vertical direction X of the absorbent main body 2 are covered with the extended portion 41E of the folded outer layer sheet 41.

Next, as shown in FIGS. 4 and 5, during the transportation of the diaper continuous body 13 formed in the continuous body forming step, at least one of the first continuous sheet 11 and the second continuous sheet 12 has a predetermined shape. The part CT to be excised is excised by the cutter device 54, and one of the pair of leg openings LH and LH (see FIG. 1) of each of the two diapers 1 (absorbent articles) adjacent to each other in the transport direction MD in the diaper continuum 13. At the same time (leg opening forming step).

In the present embodiment, only the second continuous sheet 12 (the continuum of the dorsal exterior body 4C) excises the excision target portion CT using the cutter device 54, and the first continuous sheet 11 (the ventral exterior body) is excised. The continuum of 4A) is not cut by the cutter device 54. The cut end portion formed by excising the excision target portion CT in the second continuous sheet 12 finally becomes the leg edge portion LS possessed by the dorsal exterior body 4C of each diaper 1 (see FIG. 2).
In the present embodiment, after the absorbent main body 2 is fixed to both the strip-shaped sheets 11 and 12 (after the continuous body forming step), the excision target portion CT is excised from the diaper continuous body 13 using the cutter device 54. However, before arranging the absorbent main body 2, the part CT to be excised may be excised from one or both of the strip-shaped sheets 11 and 12 using the cutter device 54.

Next, as shown in FIG. 4, the diaper continuous body 13 is folded in half in the transport orthogonal direction CD, the sheets 11 and 12 are overlapped with each other, and then the two diapers adjacent to the transport direction MD in the diaper continuous body 13 are adjacent to each other. The side seal portion S is formed by performing a treatment involving heating and melting of the exterior body 4, such as ultrasonic treatment and heat / pressurization treatment, at or near the boundary between the two. After that, the plurality of diapers 1 are continuously manufactured by cutting the diaper continuum 13 into individual diapers 1 while transporting the diaper continuum 13.

Hereinafter, the cutter device 54, which is one of the characteristic configurations of the present invention, will be described. As shown in FIGS. 4 and 5, the cutter device 54 manufactures a diaper 1 (a pants-type absorbent article which is a kind of worn article) having a pair of leg openings LH and LH through which both legs of the wearer are passed. At times, the first continuous sheet 11 in which the members constituting the front body F of each of the plurality of diapers 1 are connected in one direction (horizontal direction Y in the present embodiment) and have elasticity in the one direction is used with the one direction. A second continuous sheet in which the members constituting the back body R of each of the plurality of diapers 1 are connected in one direction (horizontal direction Y in the present embodiment) and have elasticity in the one direction while being transported in the parallel transport direction MD. 12 is transported to the transport direction MD in the same direction as the first continuous sheet 11 at predetermined intervals in the transport orthogonal direction CD with respect to the first continuous sheet 11, and both during transport of both continuous sheets 11 and 12. From at least one of the continuous sheets 11 and 12, the part CT to be excised, which has a shape that straddles the boundary between the two diapers 1 and 1 in the plan view and is symmetrical to the transport direction MD with respect to the boundary, is excised. Then, it is used to simultaneously form one of the pair of leg openings LH and LH of each of the two diapers 1, 1.

As shown in FIG. 5, the cutter device 54 has a cutter blade 57 on an outer peripheral surface, and while rotating the cutter blade 57 around a rotation axis, abuts the cutter blade 57 on one surface of a continuous sheet having a cut target portion CT. It has a cutter roll 55 and an anvil roll 56 as a receiving portion for receiving the cutter blade 57 while abutting on the other surface of the continuous sheet. Reference numeral RC in the figure indicates the rotation direction of the cutter roll 55. The cutter blade 57 rotates in the rotation direction RC.
Both the cutter roll 55 and the anvil roll 56 have a cylindrical shape, and are arranged so that their outer peripheral surfaces face each other. The cutter blade 57 projects from the outer peripheral surface of the cutter roll 55. The cutter device 54 is configured such that a part of the cutting object is cut by the cutter blade 57 by passing a cutting object such as a diaper continuum between the rolls 55 and 56.
In the present embodiment, as described above, of the continuous sheets 11 and 12 conveyed toward the cutter device 54, the second continuous sheet 12 (the continuous body of the dorsal exterior body 4C) is to be cut by the cutter device 54. ), And the cutter blade 57 abuts on one surface (upper surface in the form shown in FIG. 5) of the second continuous sheet 12.
As shown in FIG. 5, the second continuous sheet 12 is relative to the side edge 120, which is relatively close to the first continuous sheet 11 and is conveyed to the MD in the same direction alongside the continuous sheet 12, and from the first continuous sheet 11. The excision target portion CT exists along the side edge 120 relatively close to the first continuous sheet 11 and has the side edge 120 and the leg portion elastic member 6. It is sandwiched between. The center of the transport direction MD of the excision target portion CT substantially coincides with the boundary of each diaper 1 (the transport direction center line CLm described later) in the second continuous sheet 12.

FIG. 6 shows a plan view of the cutter blade 57 included in the cutter device 54, that is, the outer peripheral surface of the cutter roll 55 provided with the cutter blade 57 along the rotation axis (conveying orthogonal direction CD) of the cutter roll 55. It is a figure which shows the state which was cut and expanded.
In the present specification, unless otherwise specified, the meaning of terms such as "plan view" or "plan view" of a cutter blade provided on a curved surface such as the outer peripheral surface of a cutter roll 55 is as described above. , Refers to a state in which the curved surface is developed in a plane.
As shown in FIG. 6, the cutter blade 57 intersects one side edge 120 along the transport direction MD of the second continuous sheet 12 to be cut at two intersections A1 and A2, and is one side in a plan view. It has a convex curved portion 60 that is convex on the side opposite to the edge 120 side.
In the form shown in FIG. 6, the convex curved portion 60 has a substantially arc shape in a plan view, but the plan view shape of the convex curved portion 60 is not limited to the arc shape, and the gist of the present invention is used. It can be selected as appropriate within the range that does not deviate.

In the cutter blade 57, the portion used for cutting the cut target portion CT from the second continuous sheet 12 is a transport orthogonal direction CD (cutter roll) in the convex curved portion 60 rather than the side edge 120 of the second continuous sheet 12. Only the portion located inside (in the direction of the rotation axis of 55) (the portion located on the right side of the side edge 120 in FIG. 6). The portion of the convex curved portion 60 located outside the transport orthogonal direction CD from the side edge 120 is a so-called discard blade that is not used for excision of the excision target portion CT.

As shown in FIG. 6, in the cutter device 54, the convex curved portion 60 of the cutter blade 57 intersects two points A1 with one side edge 120 along the transport direction MD of the second continuous sheet 12 to be cut. It is characterized in that one side 60A and the other side 60B are asymmetric with respect to the transport direction center line CLm extending in the transport orthogonal direction CD (rotation axis direction of the cutter roll 55) through the midpoint P of A2.

One side 60A of the convex curved portion 60 including the intersection point A1 is located on the front side, and the other side 60B including the intersection point A2 is located on the rear side with respect to the rotation direction RC of the cutter roll 55. Therefore, with respect to the excision target portion CT of the object to be cut (second continuous sheet 12) being transported in the transport direction MD, one side 60A (intersection point A1) of the convex curved portion 60 and the other side 60B (intersection point A2). ), The one side 60A cuts the downstream side of the transport direction MD of the excision target portion CT, and the other side 60B cuts the upstream side of the transport direction MD of the excision target portion CT. The intersection point A1 corresponds to the excision start position of the excision target portion CT, and the intersection point A2 corresponds to the excision end position of the excision target portion CT.
Based on this, in the following, one side 60A of the convex curved portion 60 is also referred to as an “entry side portion 60A”, and the other side 60B is also referred to as an “exit side portion 60B”.
In FIG. 6, the curve indicated by reference numeral 60Bm is a virtual line having a symmetrical relationship with respect to the exit side portion 60B with respect to the transport direction center line CLm. If the entry side portion 60A and the exit side portion 60B are symmetrical with respect to the transport direction center line CLm, the virtual line 60Bm coincides with the entry side portion 60A, but in the present invention, the entry side portion 60A and the exit side portion 60A. Since the portion 60B is asymmetrical with respect to the center line CLm in the transport direction, the virtual line 60Bm and the entry side portion 60A do not match in FIG. 6, and at least a part thereof is deviated from each other.

The second continuous sheet 12 cut by the cutter blade 57 is formed by connecting the members constituting the rear body R of each of the plurality of diapers 1 in one direction (conveying direction MD), and the cutter is formed from the second continuous sheet 12. As described above, the excision target portion CT (see FIG. 5) excised by the blade 57 straddles the boundary between the two diapers 1 and 1 in the plan view and is symmetrical to the transport direction MD with respect to the boundary. It has a shape.
That is, the excision target portion CT excised from the second continuous sheet 12 by the cutter blade 57 is the transport direction center line CLm (two adjacent adjacent sheets in the continuous sheet 12) that bisect the excision target portion CT into the transport direction MD. One side (upstream side of the transport direction MD) and the other side (downstream side of the transport direction MD) have a symmetrical relationship with respect to the boundary line of the diapers 1 and 1). Further, as a matter of course, the second continuous sheet 12 is formed by cutting the cut target portion CT symmetrical to the transport direction MD with the cutter blade 57 sandwiching the transport direction center line CLm extending in the transport orthogonal direction CD. The cut end portion to be cut, that is, the connecting body of one leg edge portion LS and the other leg edge portion LS of the two diapers 1 and 1 adjacent to each other with the transport direction center line CLm interposed therebetween is similarly the transport direction center line. It is symmetrical with respect to the transport direction MD with CLm in between.
That is, in the present invention, since the symmetrical excision target portion CT is formed in the transport direction MD with the transport direction center line CLm in between, in other words, the two plurality of adjacent diapers 1 and 1 on the second continuous sheet 12 are formed. In order to make one leg edge LS and the other leg edge LS symmetrical with respect to their boundary (center line CLm in the transport direction), that is, "a continuum of a plurality of worn articles is being transported in the continuous direction. When a part is excised and the opening edges of the leg openings are formed on both sides of the excised part, the opening edges are formed symmetrically as designed. " As shown in FIG. 6, the (convex curved portion 60) is formed asymmetrically in the transport direction MD with the transport direction center line CLm interposed therebetween.

Conventionally, this type of cutter blade usually has the same shape as the shape of the part to be cut, and if the cutter blade 57 is taken as an example, the plan view shape of the target part CT to be cut is centered in the transport direction. Since it is symmetrical with respect to the transport direction MD with the line CLm in between, the entry side portion 60A is aligned with the exit side portion 60B in the transport direction so that the convex curved portion 60 also has the same symmetry with reference to FIG. It is typical of the prior art to match the virtual line 60Bm, which has a symmetrical relationship with the center line CLm. However, when the second continuous sheet 12 having elasticity in the transport direction MD is cut in the same direction MD by using a cutter blade symmetrical to such a transport direction MD, the excised object thus excised. It was found that the partial CT was unintentionally asymmetrical in the transport direction MD. It is presumed that this is due to the change in the transport tension of the second continuous sheet 12 (object to be cut) that occurs during cutting.

Explaining this point with reference to FIG. 5B, since the cutting of the continuous sheet 12 by the cutter device 54 is performed during the transportation of the continuous sheet 12, the cutting target portion CT is being cut by the cutter blade. Where the transport tension parallel to the transport direction MD is applied to the continuous sheet 12, the cut target portion CT has a shape (specifically, a substantially planar semicircular shape) having a predetermined length in the transport orthogonal direction CD. Therefore, the length (width) L1 of the transport orthogonal direction CD of the continuous sheet 12 at the start of cutting and the boundary between the two diapers 1 and 1 in which the cutter blade is adjacent to the transport direction MD (the transport direction center line CLm in FIG. 6). The difference from the width L2 of the continuous sheet 12 at the time when the continuous sheet 12 is reached becomes relatively large, and accordingly, the unit length received by the continuous sheet 12 with respect to the transport orthogonal direction CD during the cutting of the continuous sheet 2 is per unit length. The transport tension (linear pressure) of is changed relatively greatly. When the transport tension of the continuous sheet 12 is T, the linear pressure T1 = T / L1 of the continuous sheet 12 at the start of cutting and the linear pressure T2 = T / L2 of the continuous sheet 12 when the cutter blade reaches the boundary. At some point, since L1> L2, the magnitude relationship of T1 <T2 is established with respect to the linear pressure during cutting of the continuous sheet 12. Due to such a partial difference in linear pressure of the continuous sheet 12, the elongation of the continuous sheet 12 changes during cutting, and as a result, the portion to be excised from the continuous sheet 12 unintentionally becomes. It is presumed that the MD is asymmetrical in the transport direction. In particular, as in the form shown in FIG. 5, when only the continuous sheet 12 which is one of the two continuous sheets 11 and 12 being transported to the unidirectional MD at intervals in the transport orthogonal direction CD is cut. The degree of change in the linear pressure during cutting tends to be remarkable, and it is more difficult to make the plan view shape of the cut target portion CT after cutting symmetrical with respect to the transport direction MD.

On the other hand, in the present invention, as described above, the convex curved portion 60 of the cutter blade 57 has one side edge along the transport direction MD of the object to be cut (the second continuous sheet 12 in the present embodiment). One side (entry side portion) 60A and the other side (exit side) with reference to the transport direction center line CLm that virtually extends to the transport orthogonal direction CD through the midpoint P of the two intersections A1 and A2 with the side edge 120). Since the convex curved portion 60 is made asymmetric with the side portion) 60B, that is, the convex curved portion 60 is made asymmetric with respect to the transport direction MD with the transport direction center line CLm interposed therebetween, the manufacturing of the worn article shown in FIGS. 4 and 5. A form in which the degree of change in the linear pressure of the sheet during cutting tends to be relatively large, such as the method (cutting only one of two continuous sheets being transported to the one-way MD at intervals in the transport orthogonal direction CD). It is possible to make the plan view shape of the cut target portion CT after excision symmetrical with respect to the transport direction MD.

From the viewpoint of ensuring that the above-mentioned effects are exhibited, the side edge 120 of the second continuous sheet 12 (the transport direction MD of the object to be cut) in the convex curved portion 60 of the cutter blade 57 with reference to FIG. The distance between the two intersections A1 and A2 with (one side edge along) is the distance between the parts corresponding to the two intersections A1 and A2 after the excision of the excision target portion CT (see FIG. 5) (hereinafter,). , Also referred to as "cutting part separation distance"), preferably longer. That is, the convex curved portion 60 that is asymmetrical to the transport direction MD across the transport direction center line CLm is cut by the convex curved portion 60, and is symmetrical to the transport direction MD across the transport direction center line CLm. It is preferable that the maximum length of the MD in the transport direction is longer than that of the CT of the portion to be excised.
Regarding the excision portion separation distance, the excision target portion CT typically does not have elasticity, but if the excision target portion CT has elasticity, the excision portion separation distance is measured. At that time, the CT of the excision target portion to be measured is measured in a state of being extended to the design dimension.

From the viewpoint of ensuring that the above-mentioned action and effect are exhibited, the intersection A1 located on the front side of the rotation direction RC of the above-mentioned cutter roll 55 and the intersection point located on the rear side of the rotation direction RC with reference to FIG. With respect to the transport direction center line CLm extending in the transport orthogonal direction CD (rotation axis direction of the cutter roll 55) through A2, their midpoint P, and the midpoint P, the transport direction center line CLm and the convex curved portion 60 The intersection is B, the intersection of the vertical bisector DL1 of the intersection A1 and the intersection B and the convex curved portion 60 is C1, the intersection of the intersection A2 and the vertical bisector DL2 of the intersection B and the convex curved portion 60 is the intersection. When C2 is used, the radius of curvature R1 of the arc passing through the intersections A1, C1, B (the arc on the entry side 60A side) and the radius of curvature of the arc passing through the intersections A2, C2, B (the arc on the exit side 60B side). It is preferable that they are different from R2.

In order to make the planar view shape of the cut target portion CT after excision symmetrical with respect to the transport direction MD, the radius of curvature R1 and R2 need to be different from each other, and the magnitude relationship of "radius of curvature R1> radius of curvature R2" is established. It may be established, but it is more preferable that the magnitude relationship of "radius of curvature R1 <radius of curvature R2" is established. That is, in the convex curved portion 60, the entrance side portion 60A (the portion corresponding to the downstream side of the transport direction MD of the excision target portion CT) is on the exit side portion 60B (the portion corresponding to the upstream side of the transport direction MD of the excision target portion CT). It is more preferable that the radius of curvature is smaller than that of the corresponding portion).
The fact that the magnitude relationship of "radius of curvature R1 <radius of curvature R2" is established means that the arc on the exit side 60B side having the radius of curvature R2 (the arc passing through the intersections A2, C2, B) has the radius of curvature R1. This means that the length is shorter than the arc on the entry side 60A side (the arc passing through the intersections A1, C1, B). In FIG. 6, since the magnitude relationship of “radius of curvature R1 <radius of curvature R2” is established, the virtual line 60Bm having a symmetrical relationship with the arc of the exit side portion 60B and the center line CLm in the transport direction is on the entry side. It is located inside the arc on the portion 60A side (see FIG. 6).

In the cutter device 54, the ratio of the radius of curvature R1 to the radius of curvature R2 varies depending on the plan view shape of the convex curved portion 60, but for example, the plan view shape of the convex curved portion 60 is an arc shape as shown in FIG. In the case of a shape according to the above, on the premise of the former <the latter, the latter / former is preferably 1.01 or more, more preferably 1.02 or more, and preferably 1.5 or less, more preferably 1.3 or less. be.

In the present embodiment, as shown in FIG. 5B, an elastic member 6 extending in a direction intersecting the transport direction MD is in an extended state in the vicinity of the cut target portion CT in the second continuous sheet 12 having the cut target portion CT. It is fixed at. Then, the cut target portion CT exists at the same position in the CD in the transport orthogonal direction with the elastic member 6 (overlaps with the projected image when the elastic member 6 is projected onto the transport direction MD), and the elastic member 6 and the transport. Where a portion CT2 that does not exist at the same position in the orthogonal direction CD (does not overlap with the projected image when the elastic member 6 is projected onto the transport direction MD) is provided, the latter portion CT2 has an intersection point as described above. The radius of curvature R1 of the arc passing through A1, C1, B (the arc on the entry side 60A side) is smaller than the radius of curvature R2 of the arc passing through the intersections A2, C2, B (the arc on the exit 60B side). Is preferable. The partial CT2, that is, the side edge 120 along the transport direction MD of the second continuous sheet 12 in the cut target portion CT and its vicinity thereof are transported due to the influence of the absorber 22, which has relatively high rigidity and is not easily affected by the transport tension. It is a part that is difficult to restore when the tension is released, and its characteristics are significantly different from those of the partial CT1. It is preferable that the magnitude relationship of the above-mentioned "radius of curvature R1 <radius of curvature R2" is established only in the partial CT1.

8 to 10 show other embodiments of the present invention (second invention). Regarding other embodiments described later, components different from the above-described embodiments described with reference to FIGS. 1 to 7 will be mainly described, and similar components will be designated by the same reference numerals as those of the above-described embodiments and the description thereof will be omitted. do. The description of the embodiment is appropriately applied to the components not particularly described.

The present invention includes not only a worn article (pants-type absorbent article) having a structure in which the exterior body 4 is divided into a plurality of parts in the vertical direction X, such as the diaper 1 shown in FIG. 1, but also a diaper 1A shown in FIG. It can also be applied to a structure in which the exterior body 4 is continuous in the vertical direction X. The diaper 1A is configured in the same manner as the diaper 1 except that the exterior body 4 is continuous in the vertical direction X and does not have the ventral exterior body 4A and the dorsal exterior body 4C. A worn item having a pair of leg openings LH, LH through which both legs are passed.

9 and 10 show a portion corresponding to the leg opening forming step in the production line for manufacturing the diaper 1A shown in FIG. In the diaper 1 production line, the excision target portion CT is excised from one of a plurality of continuous sheets 11 and 12 (second continuous sheet 12) transported to the one-way MD at intervals in the transport orthogonal direction CD. Although the leg opening LH was formed (see FIG. 5), in the production line for manufacturing the diaper 1A, the leg opening LH was formed by excising the excision target portion CT from the continuous sheet 40 which was not divided into the transport orthogonal direction CDs. do.
The continuous sheet 40 is a so-called strip-shaped exterior body 4 in which the exterior bodies 4 of each of the plurality of diapers 1A are connected in one direction (horizontal direction Y), and has elasticity in the one direction, that is, the transport direction MD. .. The continuous sheet 40 has elasticity in the transport direction MD mainly due to the elasticity of the waist circumference elastic member 5 arranged in the same direction MD in an extended state.

As shown in FIG. 9, the cutter device 54A used for manufacturing the diaper 1A comprises a diaper continuous body 13A in which a plurality of diaper 1A are connected in one direction, and the continuous sheet 40 having elasticity in the one direction is used. A shape that straddles the boundary between two diapers 1A and 1A in a plan view and is symmetrical to the transfer direction MD with the boundary as a reference while being transferred to the transfer direction MD parallel to one direction. It is used to excise the part CT to be excised and simultaneously form one of the pair of leg openings LH and LH of each of the two diapers 1A and 1A.
In the form shown in FIG. 9, the excision target portion CT is located at the center of the transport orthogonal direction CD of the continuous sheet 40. In the continuous sheet 40, the transport orthogonal direction CD and the absorbent main body 2 are alternately arranged in the transport direction MD. Around each of the plurality of excision target portion CTs of the continuous sheet 40, leg portion elastic members 6 on one side of each of the two diapers 1A and 1A adjacent to each other in the transport direction MD are arranged, and the excision target portion CTs are plurality. The leg is surrounded by an elastic member. The center of the transport direction MD of the excision target portion CT substantially coincides with the boundary (transport direction center line CLm) of each diaper 1A in the continuous sheet 40.
The cutter device 54A has a cutter blade 58 on the outer peripheral surface, and brings the cutter blade 58 into contact with one surface (upper surface in the form shown in FIG. 9) of the continuous sheet 40 while rotating the cutter blade 58 around the rotation axis in the rotation direction RC. It has a cutter roll 55 and an anvil roll 56 as a receiving portion for receiving the cutter blade 58 while abutting on the other surface of the continuous sheet.

As shown in FIG. 10, the cutter device 54A has a shape in which the cutter blade 58 is closed in a plan view, and the frontmost point D1 and the rearmost point D1 of the rotation direction RC of the cutter blade 58 having the shape closed in the plan view. It is characterized by the asymmetry between one side 58A and the other side 58B with respect to the transport direction center line CLm extending in the transport orthogonal direction CD (rotation axis direction of the cutter roll 55) through the midpoint P with D2. ..

One side 58A (frontmost point D1) and the other side 58B (rearmost point D2) of the cutter blade 58 with respect to the part to be cut CT of the object to be cut (continuous sheet 40) being transported in the transport direction MD. It is 58A on one side that merges in order and cuts the downstream side of the transport direction MD of the excision target portion CT, and 58B on the other side that cuts the upstream side of the transport direction MD of the excision target portion CT. The foremost point D1 corresponds to the excision start position of the excision target portion CT, and the rearmost point D2 corresponds to the excision end position of the excision target portion CT.
Based on this, in the following, the one side 58A of the cutter blade 58 is also referred to as an "entry side portion 58A", and the other side 58B is also referred to as an "outside portion 58B".
In FIG. 10, the curve indicated by reference numeral 58Bm is a virtual line having a symmetrical relationship with respect to the exit side portion 58B with respect to the transport direction center line CLm. As described above, since the entry side portion 58A and the exit side portion 58B of the cutter blade 58 are asymmetrical with respect to the transport direction center line CLm, the virtual line 58Bm and the entry side portion 58A coincide with each other in FIG. No, at least part of the two are out of alignment.
The cutter device 54A also has the same effect as the cutter device 54.

From the viewpoint of ensuring the action and effect of the cutter device 54A, the separation distance between the frontmost point D1 and the rearmost point D2 is set to the frontmost point D1 after excision of the excision target portion CT (see FIG. 9). It is preferable that the distance is longer than the distance between the corresponding portion and the portion corresponding to the rearmost point D2 (corresponding to the above-mentioned "cutting portion separation distance"). That is, the cutter blade 58 that is asymmetrical to the transport direction MD across the transport direction center line CLm is cut by the cutter blade 58, and the cut target portion that is symmetrical to the transport direction MD across the transport direction center line CLm. It is preferable that the maximum length of the transport direction MD is longer than that of the CT.

From the viewpoint of ensuring that the action and effect of the cutter device 54A are exhibited, one side of the cutter blade 58 is based on the virtual straight line VL connecting the frontmost point D1 and the rearmost point D2 in the cutter blade 58. The portion located on the (dorsal side C side in the illustrated form) is referred to as the first portion 581, and the portion located on the other side (ventral side A side in the illustrated form) is referred to as the second portion 582. For each of the portion 581 and the second portion 582, the transport direction center line CLm and the cutter blade 58 (first portion 581) with respect to the frontmost point D1, the rearmost point D2, the midpoint P, and the transport direction center line CLm. , The two intersections with the second part 582) are B, the foremost point D1 and the vertical bisector DL1 of each intersection B, and the cutter blade 58 (first part 581, second part 582). When the intersection point is C1, the intersection point D2 and the vertical bisection line DL2 of each intersection point B and the cutter blade 58 (first part 581, second part 582) is C2, the first part 581. And at least one of the second portions 582, the radius of curvature R1 of the arc passing through the points D1, C1, B (the arc on the entry side 58A side) and the arc passing through the points D2, C2, B (the exit side 58B side). It is preferable that the radius of curvature R2 of the arc) is different from each other.
It is more preferable that the radius of curvature R1 and the radius of curvature R2 are different from each other in both the first portion 581 and the second portion 582.

In the cutter device 54A as well, similarly to the cutter device 54 described above, the magnitude relationship of the radius of curvature R1 and R2 is not particularly limited, and even if "radius of curvature R1> radius of curvature R2", "radius of curvature R1 <radius of curvature R2". However, the latter is more preferable from the viewpoint of ensuring the action and effect of the cutter device 54A. That is, the cutter blade 58 is located on the entry side portion 58A (on the downstream side of the transport direction MD of the excision target portion CT) in the portion of the first portion 581 and the second portion 582 where the radius of curvature R1 and the radius of curvature R2 are different from each other. It is more preferable that the corresponding portion) has a smaller radius of curvature than the protruding side portion 58B (the portion corresponding to the upstream side of the transport direction MD of the excision target portion CT).

In the cutter device 54A, the ratio of the radius of curvature R1 to the radius of curvature R2 varies depending on the plan view shape of the cutter blade 58, but for example, when the plan view shape of the cutter blade 58 is a shape as shown in FIG. 10 or a shape similar thereto. Assuming the former <the latter, the latter / former is preferably 1.01 or more, more preferably 1.02 or more, and preferably 1.5 or less, more preferably 1.3 or less.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention. The configuration provided in one of the above embodiments can be applied to other embodiments.

1,1A Pants-type disposable diapers (pants-type absorbent articles)
2 Absorbent body 3 Leakage-proof cuff 4 Exterior body 40 Continuous sheet (strip-shaped exterior body)
4A Ventral exterior body 4C Dorsal exterior body 41 Outer layer sheet 42 Inner layer sheet 5 Elastic member around the waist 6 Leg elastic member F Front body R Back body LH Leg opening LS Leg edge 11 1st continuous sheet 12 2nd continuous sheet 13,13A diaper continuum (absorbent article continuum)
CT excision target part 54, 54A Cutter device 55 Cutter roll 56 Anvil roll 57, 58 Cutter blade 581 First part 582 Second part 60 Convex curved part 60A, 58A Enter side part 60B, 58B Out side MD transport direction CD transport orthogonal direction RC cutter roll rotation direction

Claims (13)

At the time of manufacturing a worn article having a pair of leg openings through which both legs of the wearer pass, the members constituting the front body of each of the plurality of worn articles are connected in one direction and have elasticity in the one direction. A second continuous sheet in which one continuous sheet is transported in a transport direction parallel to the one direction, and members constituting the back body of each of the plurality of worn articles are connected in one direction and has elasticity in the one direction. , The first continuous sheet is transported in the same direction as the first continuous sheet at a predetermined interval in the transport orthogonal direction orthogonal to the transport direction, and at least of both continuous sheets during transport of both continuous sheets. From one side, the part to be excised, which straddles the boundary between the two worn articles in a plan view in the transport direction and has a shape symmetrical to the transport direction with respect to the boundary, is excised and the two worn articles are cut. A cutter device used to simultaneously form one of each of the pair of leg openings.
A cutter roll having a cutter blade on the outer peripheral surface and bringing the cutter blade into contact with one surface of the continuous sheet having the cut target portion while rotating the cutter blade around the axis of rotation, and contacting the other surface of the continuous sheet. It has a receiving part that receives the cutter blade while in contact with it.
The cutter blade has a convex curved portion that intersects one side edge of the continuous sheet along the transport direction at two intersections and is convex on the side opposite to the one side edge side in a plan view.
The convex curved portion is a cutter device in which one side and the other side are asymmetric with respect to a transport direction center line extending in the transport orthogonal direction through the midpoint of the two intersections. The cutter device according to claim 1, wherein the separation distance between the two intersections in the convex curved portion is longer than the separation distance between the portions corresponding to the two intersections after the excision of the excision target portion. Of the two intersections, the one located on the front side in the rotation direction of the cutter blade is A1, the one located on the rear side is A2, the middle point is P, the center line in the transport direction and the convex curved portion. The intersection is B, the intersection of the intersection A1 and the vertical bisector of the intersection B and the convex curved portion is C1, the intersection A2 and the vertical bisector of the intersection B and the convex curved portion. When the intersection is C2,
The cutter device according to claim 1 or 2, wherein the radius of curvature of the arc passing through the intersections A1, C1, B and the radius of curvature of the arc passing through the intersections A2, C2, B are different from each other. The cutter device according to claim 3, wherein the radius of curvature of the arc passing through the intersections A1, C1, B is smaller than the radius of curvature of the arc passing through the intersections A2, C2, B. At the time of manufacturing a worn article having a pair of leg openings through which both legs of the wearer are passed, a continuous sheet having a plurality of the worn articles connected in one direction to form a wear article continuum and having elasticity in the one direction. Is being transported in a transport direction parallel to the one direction, and the boundary between the two worn articles is straddled in the transport direction in a plan view from the continuous sheet and is symmetrical in the transport direction with the boundary as a reference. A cutter device used to excise a portion to be excised that has a shape and simultaneously form one of the pair of leg openings of each of the two worn articles.
A cutter roll having a cutter blade on the outer peripheral surface and rotating the cutter blade around the axis of rotation to abut on one surface of the continuous sheet, and a cutter blade abutting on the other surface of the continuous sheet. Has a receiving part to receive
The cutter blade has a closed shape in a plan view, and with reference to a transport direction center line extending in the transport orthogonal direction through the midpoint between the frontmost point and the rearmost point in the rotation direction of the cutter blade. A cutter device in which one side and the other side are asymmetric. The distance between the frontmost point and the rearmost point is longer than the separation distance between the portion corresponding to the frontmost point and the portion corresponding to the rearmost point after excision of the excision target portion. Item 5. The cutter device according to item 5. In the cutter blade, the portion located on one side is defined as the first portion and the portion located on the other side is defined as the second portion with reference to the virtual straight line connecting the frontmost point and the rearmost point.
For each of the first portion and the second portion, the frontmost point is D1, the rearmost point is D2, the middle point is P, and the two intersections of the transport direction center line and the cutter blade are B. The intersection of the foremost point D1 and the vertical bisector of each of the intersections B with the cutter blade is C1, and the intersection of the intersection D2 and the vertical bisector of each of the intersections B with the cutter blade is C2. If so,
Claimed that the radius of curvature of the arc passing through the points D1, C1, B and the radius of curvature of the arc passing through the points D2, C2, B are different from each other in at least one of the first portion and the second portion. Item 5. The cutter device according to Item 5. Claimed that the radius of curvature of the arc passing through the points D1, C1, B in at least one of the first portion and the second portion is smaller than the radius of curvature of the arc passing through the points D2, C2, B. Item 7. The cutter device according to Item 7. An absorbent body including an absorber that has a vertical direction extending from the ventral side of the wearer to the dorsal side via the crotch side and a lateral direction orthogonal to the vertical direction and absorbs and retains body fluid, and the absorbent body of the absorbent body. It is provided with an exterior body arranged on the non-skin facing surface side, and a pair of side seal portions, a waist opening portion and a pair are joined to each other on both sides of the exterior body along the vertical direction in each of the front body and the back body. It is a method of manufacturing a pants-type absorbent article in which a leg opening is formed.
A first continuous sheet in which members constituting the front body of each of the plurality of absorbent articles are connected in one direction and has elasticity in the one direction is transported in a transport direction parallel to the one direction, and the plurality of the absorbent articles are conveyed. A second continuous sheet in which the members constituting the back body of each absorbent article are connected in one direction and has elasticity in the one direction is designated in a transport orthogonal direction orthogonal to the transport direction with respect to the first continuous sheet. The absorbent body is transported in the same direction as the first continuous sheet at intervals, and the absorbent main body is intermittently bridged to both continuous sheets in the transport direction on one surface of both continuous sheets being transported. The process of arranging to form an absorbent article continuum,
Before or after the arrangement of the absorbent body, the boundary between the two absorbent articles is straddled in the transport direction from at least one of the first continuous sheet and the second continuous sheet in a plan view, and the boundary is used as a reference. A leg opening forming step of simultaneously forming one of the pair of leg openings of each of the two absorbent articles by cutting the cut target portion having a shape symmetrical in the transport direction with a cutter device. Have,
The cutter device has a cutter blade on the outer peripheral surface, and is in contact with a cutter roll that abuts on one surface of the continuous sheet while rotating the cutter blade around a rotation axis, and abuts on the other surface of the continuous sheet. While having a receiving part to receive the cutter blade,
The cutter blade has a convex curved portion that intersects one side edge of the continuous sheet along the transport direction at two intersections and is convex on the side opposite to the one side edge side in a plan view.
A method for manufacturing a pants-type absorbent article in which one side and the other side of the convex curved portion are asymmetric with respect to a transport direction center line extending in the transport orthogonal direction through the midpoint of the two intersections. .. The pants-type absorption according to claim 9, wherein the separation distance between the two intersections in the convex curved portion is longer than the separation distance between the portions corresponding to the two intersections after the excision of the excision target portion. Manufacturing method of sex goods. Of the two intersections, the one located on the front side in the rotation direction of the cutter blade is A1, the one located on the rear side is A2, the middle point is P, the center line in the transport direction and the convex curved portion. The intersection is B, the intersection of the intersection A1 and the vertical bisector of the intersection B and the convex curved portion is C1, the intersection A2 and the vertical bisector of the intersection B and the convex curved portion. When the intersection is C2
The method for manufacturing a pants-type absorbent article according to claim 9 or 10, wherein the radius of curvature of the arc passing through the intersections A1, C1, B and the radius of curvature of the arc passing through the intersections A2, C2, B are different from each other. The method for manufacturing a pants-type absorbent article according to claim 11, wherein the radius of curvature of the arc passing through the intersections A1, C1 and B is smaller than the radius of curvature of the arc passing through the intersections A2, C2 and B. An elastic member extending in a direction intersecting the transport direction is fixed in an extended state in the vicinity of the cut target portion in the continuous sheet having the cut target portion.
The excision target portion has a portion existing at the same position in the transport orthogonal direction with the elastic member and a portion not present at the same position with the elastic member in the transport orthogonal direction, and the intersection point in the latter portion. The method for manufacturing a pants-type absorbent article according to claim 12, wherein the radius of curvature of the arc passing through A1, C1, B is smaller than the radius of curvature of the arc passing through the intersections A2, C2, and B.

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