JP6389187B2 - Disposable diaper manufacturing method and disposable diaper - Google Patents

Description

  The present invention relates to a method for manufacturing a disposable diaper and a disposable diaper.

  Generally, a disposable diaper includes a torso that is worn around the waist of the wearer, and a crotch that has an end fixed to the torso and is worn between the wearer's crotch. The said trunk | drum is provided with the elastic member for trunk | drums which expands-contracts to a trunk periphery direction so that it may fit a wearer's body. On the other hand, the crotch includes an absorbent body on the inner side (skin surface side) of the exterior sheet, and further includes a leg elastic member that expands and contracts along the side edge to fit the wearer's leg. .

  In the disposable diaper, the body part may be manufactured while conveying each material in the longitudinal direction (see, for example, Patent Document 1 and hereinafter referred to as Prior Art 1). That is, in the above prior art 1, an elastic laminate is formed by adhering the body elastic member to a continuous sheet material such as a non-woven fabric that is continuously supplied in an elongated state in the longitudinal direction of the continuous sheet material. The body is continuously fed in the feed direction. In this case, the feeding direction of the elastic laminate and the extending direction of the elastic member for the trunk portion coincide with each other. It is preferable because it can be easily produced continuously.

  However, in the prior art 1, the body part and the crotch part are manufactured on different production lines, so that it is not easy to make the whole manufacturing equipment compact, and the body part and the crotch exterior body are separated from each other. The manufacturing work tends to be complicated because it is made of these materials. Furthermore, when a shape other than a rectangle is adopted for the torso and crotch that are individually manufactured to cover the wearer's buttocks, etc., when the crotch and torso of a predetermined shape are cut out from the continuous sheet material Further, it is necessary to cut and remove unnecessary portions, and there is a problem that waste of materials (so-called trim loss) occurs.

In order to solve these problems, it has been proposed that the crotch manufacturing process is manufactured on the same manufacturing line as the trunk manufacturing process upstream of the crotch separate process (for example, Patent Document 2). (Refer to the prior art 2).
In the prior art 2, a base sheet having a predetermined width is conveyed along the continuous direction of the base sheet, and an intermediate portion in the width direction of the base sheet is used as a crotch exterior sheet portion. A crotch portion is formed by laminating an absorber and a top sheet on the seat portion, and a ventral trunk sheet portion and a back trunk sheet portion are formed on both sides in the width direction of the base sheet, respectively. Is done. The crotch part is separated from the abdominal trunk sheet part and the back trunk sheet part in the dividing step, and the separated crotch part is cut at a predetermined interval and separated into individual crotch parts. The The divided crotch portions are rotated 90 degrees so that the length direction thereof is the width direction of the base sheet, and straddle the ventral trunk portion and the back trunk portion. After that, the ventral trunk part and the back trunk part are cut at predetermined positions and separated into individual diapers.

JP2010-264283A JP2010-051667A

  In the prior art 2, since the abdomen trunk sheet portion, the dorsal trunk sheet portion and the crotch portion are generated from a single base sheet, the entire manufacturing facility can be made compact. There are advantages. Moreover, in the said prior art 2, at the time of the said division | segmentation production | generation, the ventral | drum side trunk part and back | dorsal side trunk | drum of the said diaper which were divided | segmented are the curved-shaped dividing lines which become wide as it goes to a center part from both ends, respectively. When divided, the fit of the obtained disposable diaper is enhanced.

  However, in the said prior art 2, the said elastic member for trunk | drum and the elastic member for leg part are arrange | positioned linearly along the conveyance direction at the said base material sheet. For this reason, when the dividing line is provided in a curved shape, the side edges of the divided body seat portion and crotch portion are curved, whereas the elastic member disposed in the vicinity of the side edge is curved. It is in a straight line that does not follow. As a result, in the obtained disposable diaper, for example, as shown in FIG. 12, the body elastic member (52) expands and contracts in the horizontal plane, and the leg elastic member (53) expands and contracts in the vertical plane. Therefore, these elastic members (52, 53) expand and contract in a direction not along the circumferential direction of the wearer's legs (54), thereby reducing the fit of the disposable diaper (51) and causing leakage of urine etc. There is a fear.

  An object of the present invention is to provide a disposable diaper manufacturing method that can simplify manufacturing equipment, manufacturing operations, etc., can efficiently produce materials with little waste, and can obtain a disposable diaper with excellent fit. And to provide its disposable diapers.

For example, the present invention will be described with reference to FIGS. 1 to 11 showing an embodiment of the present invention.
That is, the method of the present invention relates to a method of manufacturing a disposable diaper, which includes a ventral trunk (2), a back trunk (3), and a crotch (4) installed on the two trunks (2, 3). A disposable diaper manufacturing method comprising an absorbent body (6) for absorbing excrement in the crotch (4),
A base sheet (10) in which a continuous sheet material (W) having a predetermined width and a plurality of elastic members (14) respectively disposed along both side edges of the continuous sheet material (W) are laminated in a feeding direction ( A substrate supply step (S1) for continuous supply to A),
Along the two virtual dividing lines (23, 23) extending in the length direction (L) of the base sheet (10), the base sheet (10) is placed on the ventral trunk part (11). And a base material dividing step (S3) for dividing the crotch exterior sheet portion (12) and the back trunk sheet portion (13),
The front end portion of the crotch outer sheet portion (12) is cut one after another at a predetermined cutting pitch (L1) in the length direction (L) and divided into crotch outer bodies (7) having a predetermined length. Crotch parting step (S4),
The crotch outer body (7) is rotated so that the crotch outer body (7) is rotated by 90 °, and the ventral trunk part (11) and the back trunk sheet are rotated. Crotch portion attaching step (S5) for intermittently attaching at a predetermined arrangement pitch (L2) in the length direction (L) so as to straddle the portion (13),
The central portion in the width direction of the base sheet (10) before the base material splitting step (S3), the crotch exterior sheet portion (12) after the base material splitting step (S3), or the individual parts. An absorbent body attaching step (S2) for attaching the absorbent body (6) to any of the crotch outer body (7);
The abdominal trunk sheet portion (11) and the back trunk sheet portion (13) to which the crotch exterior body (7) is attached are connected to each other between the crotch exterior bodies (7) adjacent to each other. A diaper dividing step (S8) for cutting each of the disposable diapers (1) at an intermediate position into individual disposable diapers (1),
In the step before the base material supply step (S1), among the elastic members (14), at least a plurality of center-side elastic members (15) are arranged near the center in the width direction of the base material sheet (10). The central elastic member (15) includes a central portion (C) where the distance to one or the other side edge of the base sheet (10) increases and a side edge portion (E) where the distance decreases. Is further arranged in a waveform of a waveform that repeats at a predetermined pitch (P) in the length direction (L) and is laminated,
In the base material dividing step (S3), for each of the plurality of center-side elastic members (15), the side edge side of the base material sheet (10) is placed on the side edge side of at least a part of the center-side portion (C). The dividing line (23) passes, and the virtual dividing lines (23) pass through the center side in the width direction of the base sheet (10) rather than at least a part of the side edge portion (E). The substrate sheet (10) is divided.

  The disposable diaper of this invention is a disposable diaper manufactured by the said manufacturing method, Comprising: The center part which attached at least the crotch part (4) of the said abdominal side trunk | drum (2) and back side trunk | drum (3) A part of the elastic member for body part (5) is arranged in a curved shape in the vicinity of the lower end edge of the part excluding the part, and at least the middle in the longitudinal direction of the outer body (7) of the crotch part (4) The leg elastic members (8) are arranged in a curved shape in the vicinity of each side edge of the portion.

  Here, the “curved shape” in which the elastic member near the center, the elastic member for the trunk portion, and the elastic member for the leg portion are arranged may include a straight line portion, or may be a fold obtained by bending a straight line. Although it includes a curved shape, it means that the whole may be a smooth curved shape.

  The ventral trunk part, crotch exterior sheet part, and back trunk part are divided from a base sheet in which a continuous sheet material having a predetermined width and an elastic member are laminated. These have a common material supply process. For this reason, the entire manufacturing facility can be made compact, and material management, material replacement, and the like can be simplified by sharing materials.

  The center-side elastic member is arranged in a curved shape in which a side edge portion having a small distance to one side edge of the base sheet and a center portion having a large distance are repeated at a predetermined pitch. The dividing line passes through the side edge side of the base sheet rather than at least a part of the central portion with respect to the central elastic member, and the width direction central side of the base sheet from at least a portion of the side edge portion Pass through. Therefore, in the vicinity of the lower end edge of the portion of the obtained disposable diaper's ventral trunk and back trunk, excluding the central part to which the crotch is attached, respectively, as a part of the elastic member for the trunk, A part of the member is arranged in a curved line, and on the other hand, a part of the center-side elastic member as a leg elastic member is arranged in a curved line in the vicinity of each side edge of the crotch outer casing. These curved body elastic members and leg elastic members are connected to each other in an annular shape, and thus expand and contract in the circumferential direction surrounding the wearer's legs or a direction similar thereto. As a result, the fit of the disposable diaper is improved and leakage of urine and the like is suppressed.

It is a partially broken front view of a disposable diaper of a 1st embodiment of the present invention. It is a system diagram of the manufacturing process of the disposable diaper of 1st Embodiment. It is explanatory drawing which shows the manufacture procedure of the disposable diaper of 1st Embodiment. It is explanatory drawing of the base-material division | segmentation process of 1st Embodiment. It is explanatory drawing of the crotch part separation process and crotch part attachment process of 1st Embodiment. It is explanatory drawing of the base-material division | segmentation process of 2nd Embodiment of this invention. It is explanatory drawing of the crotch part attachment process of 2nd Embodiment. It is explanatory drawing of the base-material supply process which shows 3rd Embodiment of this invention. It is explanatory drawing of the base-material division | segmentation process of 4th Embodiment of this invention. It is a schematic block diagram of the XX arrow directional cross section of FIG. It is explanatory drawing of the crotch part attachment process of 4th Embodiment. It is a schematic front view of the disposable diaper of the prior art 2. FIG.

  As for the disposable diaper obtained by the said manufacturing method, an expansion | deployment state becomes an H type. In this H-type disposable diaper, the crotch portion is folded in two and each end portion of the abdominal side body portion is made to face each end portion of the back side body portion, and the facing end portions are mutually connected as necessary. After fixing, it is packaged in a packaging process. At this time, the end portions of the body portion may be fixed so as not to be separated by adhesion or the like, or may be fixed detachably using a fixing means such as a hook-and-loop fastener.

  The disposable diaper has the above-mentioned abdominal body part, back-side body part and crotch part having equal length, and when obtaining these abdominal-side body part, back-side body part and crotch part, It is preferable because the entire base sheet can be used effectively without waste.

  Each of the dividing lines is not limited to a specific shape, and may be formed, for example, in a straight line shape along the length direction. In this case, the configuration of the dividing device is simple and the division can be easily performed. right. However, in the present invention, the dividing line may be set in a curved shape along the central elastic member, and a distance to one or the other side edge of the base sheet is large in the central portion, The distance may be small at the side edge portion.

  When the above-mentioned body part for a torso part and the crotch part exterior sheet part are divided by two curvilinear dividing lines, from the obtained both body part sheet part and the crotch part exterior sheet part, an unnecessary part is Without being cut off, a body portion having a wide middle portion and a crotch outer body having a narrow middle portion are formed. The dividing line has a curved shape along the elastic member closer to the center, and the elastic members of the body part sheet portion and the crotch exterior sheet portion divided in the dividing step are along the curved side edges. . As a result, disposable diapers with excellent fit can be obtained, and efficient production can be achieved with little waste of materials.

The elastic member disposed on the continuous sheet material may be an elastic member that expands and contracts in a predetermined direction, and may be a thread body and / or a belt-like body.
Of these elastic members, one or a plurality of the central elastic members may be disposed on one side edge half and the other side edge half in the width direction of the continuous sheet material. it can.

  The plurality of center-side elastic members arranged in plurality may be arranged in parallel in the curved shape in each of the half part on one side edge side and the half part on the other side edge side of the continuous sheet material. Each of the two dividing lines can be set in a curved line passing between elastic members arranged in parallel. In this case, the elastic member close to the center is a torso elastic member in each of the divided abdominal body seat portion and the back torso seat portion, and in the vicinity of both side edges of the crotch exterior sheet portion, respectively. It becomes an elastic member for legs. Therefore, the elastic members for the trunk and legs are arranged on the continuous sheet material in a single process, and the process can be further simplified.

  The linear or curvilinear dividing line passes through the side edge side of the base sheet with respect to the central elastic member with respect to the central portion, and the center side in the width direction of the base sheet with respect to the side edge portion. It may be set to pass through. In this case, the central elastic member is cut along the dividing line between the central portion and the side edge portion. For this reason, in the central elastic member, the side edge portion becomes a torso elastic member in the abdominal body seat portion and the back torso seat portion, and the central portion has both side edges of the crotch exterior sheet portion. It becomes an elastic member for legs in the vicinity.

  In a general disposable diaper, an absorber is arranged in a portion of the body portion to which the crotch portion is attached in an overlapping manner. Therefore, it is not preferable that the expansion / contraction force of the body elastic member acts, and a measure may be taken to eliminate the expansion / contraction force for the body elastic member in this portion. However, when the dividing line is set so as to cut the elastic member near the center as described above, the elastic member near the center does not remain in the portion where the crotch exterior body is attached among the seat portions for both trunks. There is no need to eliminate the elastic force of the elastic member, and all the elastic force of the elastic member near the center can be used effectively without waste.

  The crotch outer sheet portion may be cut at an arbitrary position in the crotch part separation step. However, when the dividing line is curved, the divided crotch exterior sheet portion has a shape that repeats a wide portion and a narrow portion, and when cut at the wide portion, the middle of the divided crotch portion The part becomes narrow. That is, in the obtained disposable diaper, at least one of the abdominal side trunk part and the back side trunk part has a vertical width at the center part where the crotch part is attached larger than the vertical widths at both end parts. The width of the outer covering body increases toward the both ends from the central portion in the length direction. As a result, the disposable diaper will have a shape around the wearer's leg.

  When the dividing line is curved, in the crotch parting step, when the crotch exterior sheet portion is cut and separated at a central position in the wide part, the belly side of the obtained crotch exterior body and It has the same shape as the back side. On the other hand, when the crotch exterior sheet portion is cut and separated at a position spaced in the length direction from the center position in the wide portion, the areas of the stomach side and the back side of the crotch exterior body are different from each other. For example, the absorption capacity of the absorbent body on one side can be increased, or the back side can be widened to satisfactorily wrap the wearer's buttocks.

The two dividing lines are preferable because the crotch outer body can be formed symmetrically.
In addition, the abdomen trunk sheet portion and the dorsal trunk sheet portion may both have a shape in which a wide portion and a narrow portion are repeated at a predetermined pitch. In the crotch part attaching step, when the wide parts of both body part sheet parts are opposed to each other and each end part of the crotch part exterior body is attached to these wide parts, the obtained disposable diaper is A central part becomes wide and can wrap a wearer's buttocks well.

  In the present invention, in the above-mentioned crotch portion attaching step, by narrowing the half pitch phase of one waistline seat portion in the length direction, the wide width portion of the ventral trunk portion and the narrow width of the back trunk portion The end portions of the crotch outer body may be attached to the wide width portion of one trunk portion sheet portion and the narrow portion of the other trunk portion seat portion, respectively.

The base material sheet is not limited to a specific material or structure, and one or more kinds such as a nonwoven fabric or a synthetic resin sheet can be used alone or in combination.
For example, in the base sheet (10), the outer continuous sheet material (W1) and the inner continuous sheet material (W2) having a smaller width are laminated to each other, and these continuous sheet materials (W1 and W2) are laminated. The plurality of elastic members (14) are disposed in the portion, and both side edges of the outer continuous sheet material (W1) are exposed as extended portions (W3) outward from the side edges of the inner continuous sheet material (W2). Every
After the crotch attaching step (S5), the outer continuous sheet material (W1) is bent along the side edge of the inner continuous sheet material (W2), and the extended portion (W3) is made the inner continuous sheet material ( W2) may be laminated.

In this case, the outer sheet material is laminated on the upper portion of the inner sheet material with the upwardly extending portion folded back at the upper edge of each body portion. As a result, this disposable diaper is in a state in which the upper end edges of the abdominal body part and the back body part are wrapped with the outer continuous sheet material, and there is no risk of peeling at the upper end edge, and the appearance is good.
Further, in this case, each end portion of the crotch portion in the length direction is disposed between the extended portion of the outer sheet material and the inner sheet material, and thereby leakage of urine and the like can be prevented more satisfactorily.

Further, as the inner continuous sheet material, two inner continuous sheet materials are used that are spaced apart from each other on one side edge side and the other side edge side of the base sheet, and each inner continuous sheet material is a base material. You may equip the side edge part of the center part side of a sheet | seat with a flap-shaped cuff, respectively.
In this case, a disposable diaper in which a part of the inner continuous sheet material constituting the base sheet also serves as a flap-shaped cuff and has flap-shaped cuffs on both sides of the crotch can be manufactured at low cost.

  In addition, the said absorber attachment process may be performed at arbitrary timing until it separates into a disposable diaper. For example, it is also possible to attach the absorbent body to each crotch outer body fixed to the body sheet portion after the crotch part attaching step. Before the base material dividing step, the absorbent body is attached at a predetermined interval in the center portion in the width direction of the base material sheet, or after the base material dividing step, the crotch exterior sheet portion is provided at a predetermined interval. An absorber may be attached. In these cases, a top sheet made of a liquid-permeable sheet is continuously supplied and attached to cover the absorber, or a back sheet made of a liquid-impermeable sheet is continuously placed between the absorber and the base sheet. Can be supplied and installed.

Features described and / or illustrated in connection with one such embodiment or each of the following examples may be in the same or similar form in one or more other embodiments or other examples, and / or It can be utilized in combination with or instead of the features of other embodiments or examples.

The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and drawings are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined only by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 5 show a first embodiment of the present invention.
As shown in FIG. 1, this disposable diaper (1) has a crotch part (2), a crotch part (2), a back side trunk part (3), and a crotch part spanned between each middle part (2.3). 4). The ventral trunk (2) and the back trunk (3) are made of an elastic laminate in which a trunk elastic member (5) is laminated on a sheet material (W) such as a nonwoven fabric. Each end of 2) is fixed to each corresponding end of the back trunk (3) by welding or the like. The crotch part (4) includes an absorbent body (6) that absorbs excrement on the inside of the crotch exterior body (7), and leg portions along both side edges of the crotch exterior body (7). An elastic member (8) is disposed.

The disposable diaper (1) is manufactured by a manufacturing method including the following steps, for example, as shown in FIGS.
-Substrate supply step (S1): The substrate sheet (10) is continuously supplied in the feed direction (A).
-Absorber attachment process (S2): The said absorber (6) is attached to the intermediate part of the width direction of the said base material sheet (10).
-Substrate splitting step (S3): The base sheet (10) is formed along the two virtual split lines (23, 23) extending in the length direction (L), and the ventral trunk sheet portion ( 11), a crotch exterior sheet portion (12), and a back trunk portion seat portion (13).
Crotch part separation step (S4): The crotch exterior sheet portion (12) is cut into predetermined lengths (cutting pitches) (L1) and separated into crotch exterior bodies (7).
-Crotch part attaching step (S5): After the crotch part exterior body (7) is rotated by a predetermined angle (90 degrees), the abdominal trunk part (11) and the back trunk part (13) ) In the length direction (L) for every predetermined length (arrangement pitch) (L2).
Folding step (S6): The crotch outer body (7) is folded twice, and the abdomen trunk sheet part (11) and the dorsal trunk sheet part (13) are overlapped with each other.
Joining step (S7): The abdominal trunk sheet portion (11) and the back trunk sheet portion (13) are welded to each other at an intermediate position between the adjacent crotch exterior bodies (7). Fixed.
Diaper individual separation step (S8): The above-mentioned ventral trunk sheet portion (11) and dorsal trunk sheet portion (13) are cut at the position where the welding and fixing are performed, and individual disposable diapers (1 ).

  As shown in FIG. 2 and FIG. 3, the base material sheet (10) continuously supplied in the feeding direction (A) in the base material supplying step (S1) is made of two non-woven fabrics each having a predetermined width. A continuous sheet material (W) and an elastic member (14) sandwiched between the two sheet materials (W) in a state of being stretched in the longitudinal direction. 14) are fixed to each other by an adhesive such as a hot melt adhesive.

  The elastic member (14) includes a body elastic member (5) disposed on the side edge side of the base sheet (10) and a leg elastic member (8) disposed on the center side. As the material of these elastic members (14), polyurethane, natural rubber, thermoplastic resin, or the like can be used. The shape can be a thread, ribbon, or the like. One or a plurality of elastic members (14) may be used. When a thermoplastic resin is used as a material, a hot melt adhesive may be unnecessary if the material itself has a function of adhering to the continuous sheet material (W). The trunk elastic member (5) and the leg elastic member (8) may have the same material and shape, or may have different materials and shapes.

  In the half on one side edge side and the other half on the other side edge side of the base sheet (10), each of the elastic members (14) is disposed near the center in the width direction of the base sheet (10). A plurality of, for example, two elastic members (15, 15) are curved and arranged in parallel to each other. The curve shows that the center portion (C) having a large distance to one or the other side edge of the base sheet (10) and the side edge portion (E) having a small distance are in the length direction (L ) At a predetermined pitch (P). That is, a plurality of the elastic members (15) arranged in parallel with each other are provided on the half including the one side edge and the half including the other side edge. The elastic member (15) arranged in the half of the one side edge and the elastic member (15) arranged in the half of the other side edge are mutually in the central portion (C). They are arranged in line symmetry with each other along the waveform of a waveform having a predetermined pitch (P) (wavelength) which is close to each other and moves away from each other at the side edge portion (E). Of the two centrally arranged elastic members (15, 15) arranged in parallel, the elastic member (15) at the center side of the base sheet constitutes the elastic member for the leg part (8), and the base sheet side edge side The elastic member (15) constitutes a part of the body elastic member (5).

  In the absorber attachment step (S2), a back sheet (16) made of a liquid-impermeable material is bonded in advance to the intermediate portion in the width direction of the base sheet (10), and the back sheet (16) The said absorber (6) is attached and arrange | positioned for every predetermined space | interval. For example, as shown in FIG. 2, the absorbent body (6) includes a roll pulp (17) pulverized by a pulverizer (18) in an absorbent body forming step (S9), and a deflated fluff is formed into a pattern drum (19 ). In addition, as said liquid-impermeable material, a polyethylene film, the nonwoven fabric which has water repellency and air permeability, etc. are preferable, for example.

  When the absorbent body (6) is attached, a top sheet (20) made of a liquid-permeable material covering the absorbent body (6) and flap-shaped cuffs (21) disposed on both sides of the absorbent body (6) are provided. Attached to the substrate sheet (10). The cuff (21) is generated in the cuff forming step (S10), for example, as shown in FIG. In addition, as a liquid-permeable material which comprises the said top sheet (20), a liquid-permeable nonwoven fabric, a mesh sheet, etc. are preferable, for example.

A transfer sheet is interposed between the top sheet (20) and the absorbent body (6) as necessary. The transfer sheet diffuses urine and the like quickly, and the absorbed urine and the like are absorbed into the top sheet (20 ) To prevent leakage.
Further, a superabsorbent polymer may be mixed in the fluff of the absorbent body (6). In this case, the absorbent body (6) may be wrapped with a tissue so that the superabsorbent polymer does not spill out of the fluff. In the present invention, the absorbent body may be constituted by carrying a superabsorbent polymer on a nonwoven fabric or the like.

  As shown in FIG. 3, the base material sheet (10) to which the absorbent body (6) is attached is divided into two virtual dividing lines (23 by the dividing device (22) in the base material dividing step (S3).・ Abdominal trunk sheet part (11), crotch exterior sheet part (12), and back trunk sheet in order from one side edge to the other side edge, cut along 23) Divided into three parts (13).

  More specifically, as shown in FIG. 4, each of the dividing lines (23) is set so as to pass between the two center-side elastic members (15) arranged in parallel. Therefore, these dividing lines (23) are divided into the central portion (C) where the distance to the side edge of the base sheet (10) becomes larger and the side edge portion where the distance becomes smaller. (E) is set in a curved shape that is repeated at the predetermined pitch (P). That is, the pair of curved dividing lines (23) approach each other in the central portion (C) and have a waveform with a predetermined pitch (P) (wavelength) that is the same as each other in the side edge portion (E). They are curves and are set symmetrically with respect to each other. In this case, the waveform of the dividing line (23) and the waveform of the elastic member (15) may be set to the same amplitude and phase. As a result, in the obtained body sheet portions (11, 13) and crotch outer sheet portions (12), the wide width portion and the narrow width portion are repeated at the pitch (P), respectively.

  Of the central elastic member (15), the elastic member on the center side of the continuous sheet material (W) with respect to the dividing line (23) is the leg crotch outer sheet portion (12) as the leg elastic member (8). ) In the vicinity of the side edge. The elastic member on the side edge side of the continuous sheet material (W) with respect to the dividing line (23) is the curved side edge of each of the body portion sheet portions (11, 13) as the body elastic member (5). Located in the vicinity.

As shown in FIG. 5, the crotch outer sheet portion (12) is adjacent to each other for each predetermined length (L 1) by the cutting device (24) in the crotch part separation step (S 4). It cut | disconnects between them and is divided into a crotch exterior body (7). The predetermined length (L1), that is, the length of the crotch outer body (7) is set to a dimension equal to the pitch (P). The cut portion is set at a position shifted (separated) in the length direction (L) from the central portion in the wide portion of the crotch exterior sheet portion (12). Thus, the crotch outer body (7) obtained has a width that increases from the central portion in the length direction (L) toward both ends, and the area on one end side is larger than the area on the other end side. large. In the vicinity of both side edges of the crotch outer body (7), leg elastic members (8) are arranged along the curved side edges.
In the first embodiment, the cut portion is shifted in the length direction (L) from the center of the wide portion. However, in the present invention, the crotch outer sheet portion (12) may be cut at the center of the wide portion.

  As shown in FIG. 3 and FIG. 5, the separated crotch outer body (7) is rotated 90 degrees by the transfer device (25) in the crotch attaching step (S5), and then the abdomen. It is attached at intervals of a predetermined length (L2) in the length direction so as to straddle the side body seat portion (11) and the back body seat portion (13). That is, the crotch outer body (7) has one end portion on the narrow area side fixed to the center position of the wide portion of the abdominal body seat portion (11) and the other end portion on the wide area side on the back side trunk. It is fixed to the center position of the wide portion of the part sheet portion (13). The wide portions of these body seat portions (11, 13) are repeated at the pitch (P), and the predetermined length (L2) of the mounting interval is equal to the dimension of the pitch (P). .

In the first embodiment, the other end portion on the wide area side of the crotch outer body (7) is fixed to the wide portion of the back body seat portion (13), so that the disposable diaper obtained is a wearer. Will be able to wrap the buttocks well. However, in the present invention, the other end portion on the wide area side of the crotch outer body (7) is fixed to the abdomen trunk sheet portion (11), and the absorption disposed on the inner side of the crotch outer body (7). The absorption capacity on the ventral side of the disposable diaper may be large due to the large area of the body (6).
In the first example, the ventral trunk part (11) and the back trunk part (13) were set to have the same width. However, in the present invention, for example, the back trunk part seat portion (13) may be formed wider than the abdominal trunk part sheet portion (11), and the wearer's buttocks may be satisfactorily wrapped.

In FIG. 3, the crotch outer body (7) installed on the both body seat portions (11, 13) is folded in half by the bi-folding device (26) in the folding step (S6), The part seat portion (11) and the back body seat portion (13) are overlapped with each other. After that, in the joining step (S7), the body part sheet portions (11, 13) are welded and fixed to each other at an intermediate position between the adjacent crotch exterior bodies (7) by the sealing device (27). Thereafter, in the diaper separation step (S8), the welding site is cut by the cutting device (28) to generate individual disposable diapers (1).
Thereafter, the individual disposable diaper (1) is changed to an appropriate posture by the reversing device (29) of FIG. 2 and sent to the next packaging step.

  As shown in FIG. 1, in the separated disposable diaper (1), the cut end of the ventral trunk (2) and the cut end of the dorsal trunk (3) are fused and fixed to each other. It is in a state, and it has an annular shape at both body parts (2, 3).

  The cut portion which is the welding portion is set at an intermediate position between the adjacent crotch outer bodies (7) in FIG. 4, and the interval between the adjacent crotch outer bodies (7) is the pitch (P). Is the same dimension as Therefore, in the disposable diaper (1) obtained by the above manufacturing method, the length of both body parts (2, 3) is equal to the pitch (P). On the other hand, the length of the crotch outer body (7) is set to a dimension equal to the pitch (P). Therefore, the abdominal side trunk | drum (2), back side trunk | drum (3), and crotch part (4) of this disposable diaper (1) are mutually equal length.

In the crotch outer body (7) of FIG. 5, each end is fixed to the wide part of the abdomen trunk sheet part (11) and the wide part of the dorsal trunk sheet part (13). . Therefore, as for both the trunk | drums (2 * 3) of the disposable diaper (1) of FIG. 1, the vertical width in the center part which attached the crotch part (4) is wider than the vertical width in both ends.
The dividing line (23) of FIG. 3 is set in a curved shape along the central elastic member (15). Therefore, the body elastic members (5) are arranged in a curved shape along the lower end edge in the vicinity of the lower end edge of the two body parts (2, 3) of the disposable diaper (1) in FIG.

  As described above, the crotch outer body (7) is widened from the central portion in the length direction toward both ends, and the leg elastic members (8) are provided near the side edges, respectively. It is arranged in a curved shape along the side edge. Therefore, as shown in FIG. 1, in the disposable diaper (1), the elastic members (14) are curved along the lower end edges of the body parts (2, 3) and both side edges of the crotch part (4). Are arranged in a ring and are connected to each other. Therefore, these elastic members (14) expand and contract in the circumferential direction of the wearer's leg (30) or in a direction approximate thereto.

In the first embodiment, the dividing line is set between a pair of central elastic members. However, in the present invention, the dividing line (23) may be set so as to cross the elastic member near the center as in the second embodiment shown in FIGS.
That is, in the second embodiment, as in the first embodiment, of the elastic members (14) arranged on the base sheet (10), two elastic members (15) arranged closer to the center in the width direction. 15) is arranged in a curved line, and this curve has a central portion (C) where the distance to the side edge of the base sheet (10) increases and a side edge portion where the distance decreases ( E) is repeated at a predetermined pitch (P) in the length direction (L). In this embodiment, the waveform of the dividing line (23) has the same phase and the same wavelength (pitch (P)) as the waveform of the elastic member (15). The amplitude of the waveform of (23) is smaller than the amplitude of the waveform of the elastic member (15).

  However, in the case of the second embodiment, unlike the first embodiment, the dividing line (23) in the base material dividing step (S3) is closer to the central portion (C) than the central elastic member (15). Is also set so as to pass through the side edge side of the base sheet (10) and pass through the center side of the base sheet (10) at the side edge portion (E) rather than the central elastic member (15). Therefore, the dividing line (23) crosses the elastic member (15) between the central portion (C) and the side edge portion (E). As a result, the elastic member (15) closer to the center has an elastic part for the trunk part in the narrower part of the ventral trunk part (11) and the back trunk part (13). It arrange | positions as a member (5), and a center side part (C) is arrange | positioned as the elastic member for legs (8) in the vicinity of the both-sides edge of a crotch exterior sheet | seat part (12).

After the crotch exterior sheet portion (12) obtained by the above division is divided into crotch exterior bodies, as shown in FIG. 7, the transfer device (25) performs the above-described transfer device (25) in the crotch attachment step (S5). It is attached at intervals of a predetermined length (L2) in the length direction so as to straddle the ventral trunk part (11) and the back trunk part (13). The crotch outer body (7) is fixed to the wide portion of each body seat portion (11, 13), but the central elastic member (15) does not remain in the wide portion. Therefore, it is not necessary to eliminate the expansion / contraction force of the central elastic member (15) at the site where the crotch outer body (7) is attached, and the expansion / contraction force of the central elastic member (15) can be used effectively without waste. it can. Moreover, as shown in FIG. 7, a center-side elastic member (15) is disposed along the entire periphery of the periphery of the so-called leg hole, so that the wearer can insert the leg portion, as in the first embodiment. Through the subsequent steps, a disposable diaper with excellent fit can be obtained.
Note that the number of the central elastic members (15) is not limited to a specific number, and may be one or three or more. Other configurations of the second embodiment are the same as those of the first embodiment, and the description thereof is omitted.

  In the present invention, when the dividing line is set in a curved line, the wide portion of the ventral trunk portion and the narrow portion of the dorsal trunk portion face each other, and one wide portion and the other The crotch outer body may be attached so as to straddle the narrow part of the.

  In the present invention, for example, the elastic member may be sandwiched between one continuous sheet material having a predetermined width and two continuous sheet materials having a narrow width disposed along each side edge. Furthermore, the both side edges of one wide continuous sheet material may be folded inward, and the folded portion may sandwich the elastic member to form a base sheet having a predetermined width.

In the first embodiment, a back sheet, a top sheet, a flap-like cuff (also referred to as a side sheet, a three-dimensional gather) and the like are laminated on the base sheet. However, in the present invention, at least one of these laminated sheet materials may also be used as the continuous sheet material constituting the base sheet.
For example, in the first embodiment, the continuous sheet material is composed of a nonwoven fabric or the like. However, in the present invention, for example, at least one continuous sheet material may be constituted by a liquid-impermeable sheet material, and this continuous sheet material may also be used as a back sheet.

  Further, for example, as in the third embodiment shown in FIG. 8, a continuous sheet material (W) having a predetermined width and an outer edge portion (21a) of a flap-shaped cuff (21) disposed on the inner side thereof are used as a base material. The sheet (10) may be configured. That is, in this third embodiment, the elastic member (14) is arranged on the side edge side of one continuous sheet material (W) having a predetermined width, and the back sheet (16) is interposed in the middle portion in the width direction. The absorber (6) is attached by the pattern drum (19). Above the absorber (6), a top sheet (20) and a flap-like cuff (21) fixed along both side edges are arranged. The elastic member (14) is sandwiched between the outer edge (21a) of the cuff (21) and the continuous sheet material (W). Therefore, the outer edge portion (21a) of the cuff (21) constitutes a part of the continuous sheet material (W). The base sheet (10) is formed by the outer edge portion (21a), the continuous sheet material (W) having the predetermined width, and the elastic member (14) therebetween. Reference numeral (21b) denotes an elastic body for the cuff disposed at the inner edge of the cuff (21). The other configurations of the third embodiment are the same as those of the first embodiment, and illustration and description thereof are omitted.

  In the present invention, in the third embodiment, the outer edge portion of the top sheet serves as a continuous sheet material instead of the outer edge portion of the cuff, and this and the continuous sheet material having the predetermined width sandwich the elastic member. Thus, the base sheet may be formed. In these cases, the continuous sheet material having the predetermined width may also be used as the back sheet material, thereby further reducing the number of stacked sheets.

  As in the fourth embodiment shown in FIGS. 9 to 11, the dividing line may be set linearly.

  In the fourth embodiment, as shown in FIG. 9, a plurality of center-side elastic members (15) are provided in each of the half on one side edge side and the other side edge side of the base sheet (10). They are curved and arranged in parallel with each other. The curved elastic member (15) has a predetermined pitch (P) in the length direction (L) between the central portion (C) and the side edge portion (E), as in the first embodiment. Is repeated. On the other hand, the two parting lines (23, 23) for dividing the base sheet (10) into three parts are both formed in a straight line parallel to each other along the length direction (L) of the base sheet (10). ing.

  Therefore, in the fourth embodiment, the structure of the dividing device (22) for dividing is simple, and it is necessary to align the curved shape of the central elastic member (15) and the curved shape of the dividing line (23). No splitting operation is easily performed.

  Each of the dividing lines (23) corresponds to the base sheet (10) with respect to the central elastic member (15) in the half of each side edge of the base sheet (10) rather than the central part (C). ) And the center side in the width direction of the base sheet (10) rather than the side edge portion (E).

  The central elastic member (15) is cut along the dividing line (23) between the central portion (C) and the side edge portion (E). As a result, the elastic member (15) closer to the center has a portion (E) closer to the side edge to the ventral trunk portion seat portion (11) and the back trunk portion seat portion (13). On the other hand, the central portion (C) is disposed as a leg elastic member (8) in the vicinity of both side edges of the crotch exterior sheet portion (12).

As shown in FIG. 11, in the case of the present embodiment, the center-side elastic body is hardly left in the portion to which the crotch exterior body (7) is attached among the body seat portions (11, 13).
The curved body elastic member (5) and leg elastic member (8) are arranged so as to be connected in a ring shape. For this reason, these curved elastic members (5, 8) expand and contract in the circumferential direction surrounding the wearer's legs or in a direction similar thereto.

  As shown in FIG. 9, the base sheet (10) includes an outer continuous sheet material (W1) and two inner continuous sheet materials (W2) having a narrower width. As shown in FIG. 9 and FIG. 10, a plurality of elastic members (14) are arranged between the continuous sheet materials (W1, W2) on the side in the width direction, and the back is located at the center in the width direction. The sheet (16), the absorber (6), and the top sheet (29) are arranged in order from the outside. Both side edges of the top sheet (29) are welded to the middle part of each inner continuous sheet material (W2) by welding parts (31). Of each inner continuous sheet material (W2), the inner portion of the welded portion (31) constitutes a flap-shaped cuff (21), and the flap-shaped cuff (21) includes an elastic member for cuff.

  The extending portions (W3) on both side edges of the outer continuous sheet material (W1) protrude beyond the side edges of the inner continuous sheet material (W2). The base sheet (10) is divided into three along the dividing line (23), and then the crotch exterior sheet portion (12) is cut at a predetermined length (L1) to obtain a crotch exterior (7). ) Is cut off. After the crotch outer body (7) is rotated by 90 degrees, as shown in FIG. 11, it straddles the abdominal trunk sheet portion (11) and the back trunk sheet portion (13), It is attached at intervals of a predetermined length (L2). After the crotch attaching step (S5), the outer continuous sheet material (W1) is bent along the side edge of the inner continuous sheet material (W2), and the protruding extended portion (W3) is the inner continuous sheet. Overlaid on wood (W2).

The disposable diaper obtained by the above process is in a state in which the upper end edges of the abdominal side trunk part and the back side trunk part are wrapped with the outer continuous sheet material (W1), and therefore the upper end edge is not likely to be peeled off.
Other configurations of the present embodiment are the same as those of the first embodiment and the third embodiment, and illustration and description thereof are omitted.

  The manufacturing method of the disposable diaper described in each of the above-described examples is illustrated in order to embody the technical idea of the present invention, and the shape, dimensions, material, manufacturing procedure, etc. of each member are the same as those in this embodiment. The present invention is not limited to this, and various modifications can be made within the scope of the claims of the present invention.

  For example, in the said 1st Example, the absorber was attached to the center part with respect to the base material sheet | seat before dividing | segmenting at the said base material division | segmentation process. However, in the present invention, the absorber may be attached to the crotch outer sheet portion obtained by the division in the base material dividing step, or each crotch outer body fixed to the body sheet portion, for example, An absorbent body may be attached to the crotch outer body that has been separated.

In the first embodiment, the production of a so-called pants-type disposable diaper has been described. However, the present invention may produce a so-called tape-type disposable diaper.
In the present invention, constituent materials such as the continuous sheet material, elastic member, and absorber, dimensions, and shapes are not limited to those of the above-described embodiments.

  The present invention can be used for disposable diapers and their manufacture.

1: Disposable diaper 2: Ventral trunk 3: Dorsal trunk 4: Crotch 5: Elastic member for trunk 6: Absorber 7: Crotch exterior 8: Elastic member for leg
10: Base sheet
11: Seat part for abdominal trunk 12: Crotch exterior sheet part 13: Seat part for back trunk
14: Elastic member 15: Middle elastic member
23: Dividing line A: Feeding direction C: Center side portion E: Side edge side portion L: Length direction L1: Cutting pitch (predetermined length for cutting) L2: Arrangement pitch (predetermined length for mounting)
P: Pitch
S1: Base material supply process S2: Absorber attachment process S3: Base material division process
S4: Crotch part separation process S5: Crotch part attachment process S8: Diaper individual part process W: Continuous sheet material W1: Outer continuous sheet material W2: Inner continuous sheet material W3: Extension part

Claims (10)

A ventral trunk (2), a back trunk (3), and a crotch (4) installed on the two trunks (2, 3), and excrement in the crotch (4) It is a manufacturing method of a disposable diaper provided with the absorber (6) which absorbs,
A base sheet in which a continuous sheet material (W) having a predetermined width and a plurality of elastic members (14) for body parts and leg parts arranged along both side edges of the continuous sheet material (W) are laminated. A base material supplying step (S1) for continuously supplying (10) in the feed direction (A);
Along the two virtual dividing lines (23, 23) extending in the length direction (L) of the base sheet (10), the base sheet (10) is placed on the ventral trunk part (11). And a base material dividing step (S3) for dividing the crotch exterior sheet portion (12) and the back trunk sheet portion (13),
The front end portion of the crotch outer sheet portion (12) is cut one after another at a predetermined cutting pitch (L1) in the length direction (L) and divided into crotch outer bodies (7) having a predetermined length. Crotch parting step (S4),
The crotch outer body (7) is rotated so that the crotch outer body (7) is rotated by 90 °, and the ventral trunk part (11) and the back trunk sheet are rotated. Crotch portion attaching step (S5) for intermittently attaching at a predetermined arrangement pitch (L2) in the length direction (L) so as to straddle the portion (13),
The central portion in the width direction of the base sheet (10) before the base material splitting step (S3), the crotch exterior sheet portion (12) after the base material splitting step (S3), or the individual parts. An absorbent body attaching step (S2) for attaching the absorbent body (6) to any of the crotch outer body (7);
The abdominal trunk sheet portion (11) and the back trunk sheet portion (13) to which the crotch exterior body (7) is attached are connected to each other between the crotch exterior bodies (7) adjacent to each other. A diaper dividing step (S8) for cutting each of the disposable diapers (1) at an intermediate position into individual disposable diapers (1),
In the step prior to the base material supply step (S1), among the trunk and leg elastic members (14), at least near the center in the width direction of the base material sheet (10) An elastic member (15) is arranged, and the central elastic member (15) is small in distance from the central portion (C) where the distance to one or the other side edge of the base sheet (10) is large. And a step of laminating the side edge portion (E) to be arranged in a curved shape having a waveform repeating at a predetermined pitch (P) in the length direction (L),
In the base material dividing step (S3), for each of the plurality of center-side elastic members (15), the side edge side of the base material sheet (10) is placed on the side edge side of at least a part of the center-side portion (C). The dividing line (23) passes, and the virtual dividing lines (23) pass through the center side in the width direction of the base sheet (10) rather than at least a part of the side edge portion (E). Divide the base sheet (10) ,
The base sheet (10) is formed by laminating an outer continuous sheet material (W1) and an inner continuous sheet material (W2) narrower than the outer continuous sheet material (W1). The plurality of body and leg elastic members (14) are disposed, and both side edges of the outer continuous sheet material (W1) are extended outward from the side edges of the inner continuous sheet material (W2) ( Leave it exposed as W3)
After the crotch attaching step (S5), the outer continuous sheet material (W1) is bent along the side edge of the inner continuous sheet material (W2), and the extended portion (W3) is made the inner continuous sheet material ( W2),
put it here,
As the inner continuous sheet material (W2), two inner continuous sheet materials (W2) that are spaced apart from each other on one side edge side and the other side edge side of the base sheet (10) are used. A method for manufacturing a disposable diaper, characterized in that the inner continuous sheet material (W2) is provided with a flap-shaped cuff (21) at each side end on the center side of the base sheet (10) .   The said base material sheet (10) is divided | segmented so that the said dividing line (23) may become the linear form each extended in the said length direction (L) in the said base material division | segmentation process (S3). A manufacturing method for disposable diapers.   In the substrate dividing step (S3), the dividing line (23) has a corrugated curved shape along the central elastic member (15), and the base portion (C) has a base material. The base sheet (10) is divided so that a distance to the one or other side edge of the sheet (10) is large and the distance is small at the side edge portion (E). Manufacturing method for disposable diapers.   A plurality of the central elastic members (15) arranged in parallel with each other in one half including one side edge and another half including the other side edge of the base sheet (10). The base sheet (10) is divided so that each of the curved dividing lines (23) includes the elastic members (15, 15) arranged in parallel into two groups. The manufacturing method of the disposable diaper of Claim 3.   In the crotch part dividing step (S4), the crotch outer sheet at a position spaced apart by a predetermined dimension in the length direction (L) from the central part in the length direction (L) in the side edge portion (E). The method of manufacturing a disposable diaper according to claim 3, wherein the portion (12) is cut and separated.   The dividing line (23) passes through the side edge side of the base sheet (10) with respect to the central elastic member (15) rather than the central part (C), and the side edge part (E). The manufacturing method of the disposable diaper in any one of Claim 1 to 5 formed so that it may pass the width direction center side of a base material sheet (10) rather than. A disposable diaper manufactured by the manufacturing method according to claim 1,
The elastic member (5) for the torso is provided in the vicinity of the lower end edge of the abdomen side torso (2) and the back torso (3) except at least the central part to which the crotch (4) is attached. Some are arranged in a curve,
The leg elastic members (8) are arranged in a curved shape at least in the vicinity of the side edges of the outer body (7) of the crotch part (4) at least in the middle part in the length direction. Disposable diapers. The disposable diaper according to claim 7 , wherein the ventral trunk (2), the back trunk (3), and the crotch (4) are set to have the same length. At least one of the ventral trunk (2) and the back trunk (3) is such that the vertical width at the central portion to which the crotch portion (4) is attached is wider than the vertical width at both ends.
The disposable diaper according to claim 7 , characterized in that the outer body (7) of the crotch part (4) is wider in width from the central part in the length direction toward both ends. The ventral body (2) and back body (3) are for the body and legs sandwiched between the outer sheet material (W1), the inner sheet material (W2), and both sheet materials (W1 and W2). and a section for the elastic member (14), the outer sheet material (W1) extending portion (W3) each barrel of upward (2, 3) inside the sheet material is folded at the upper edge of the (W2) The crotch portion (4) has end portions in the length direction extending from the extended portion (W3) of the laminated outer sheet material (W1) and the inner sheet material (W2). The disposable diaper of Claim 7 arrange | positioned by being pinched | interposed between.