JP2013138795A - Disposable diaper, method for manufacturing the same, and device for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposal diaper with a shrinking action of a stretching/contracting material which prevents distortion on the waist opening part and crumbling the outer side of the diaper, and to provide a method for manufacturing the diaper and a manufacturing device thereof.SOLUTION: A waste stretching/contracting material 51, which is arranged on a waste part of a disposal diaper, is provided on a width-direction center part of a front body side or a back body side of the disposal diaper in a discontinuous manner, so that distortion on the waist opening part 4 can be prevented by the effect of the shrinking action of the waste stretching/contracting material 51.

Description

  The present invention relates to a disposable diaper that is attached to a wearer's crotch and absorbs and holds a liquid such as urine. Moreover, this invention relates to the manufacturing method of a disposable diaper, and the manufacturing apparatus of a disposable diaper. More specifically, the present invention relates to a disposable diaper or the like in which a waist elastic material is disposed in the vicinity of a waist opening and a waist gather is formed.

  Conventionally, disposable diapers used, for example, for infants and the elderly are known. There are various types of disposable diapers, for example, pants-type disposable diapers and tape-type disposable diapers are known (for example, Patent Document 1, Patent Document 2, and Patent Document 3). The pants-type disposable diaper is a type of disposable diaper in which both front and rear body side parts are joined in advance. As this pants-type disposable diaper, first, as shown in Patent Document 1, an integrated type in which an outer cover sheet is integrated from the front body to the back body is known. Moreover, as a pants-type disposable diaper, as shown in Patent Document 2, the cover sheet of the exterior is separated at the front body and the back body, and the absorbent main body is bridged between the front body exterior body and the back body exterior body. A crosslinked type is also known. Furthermore, as shown in Patent Document 3, the tape-type disposable diaper is a type in which adhesive tape is attached to both sides of the front body or the back body, and the front body and the back body are bonded using the adhesive tape when worn. It is a disposable diaper.

  In the disposable diaper described above, generally, a plurality of waist elastic members are fixed in an extended state along the periphery of the waist opening formed by bonding the front body and the back body. As described above, by arranging a plurality of waist elastic members, when the waist elastic material contracts, wrinkles are generated in the vicinity of the waist opening. This collar forms a waist gather near the waist opening. This waist gathers can contact a wearer's skin and can improve the adhesiveness of a disposable diaper. Therefore, by forming the waist gathers, the fit of the diaper can be improved and leakage of excrement can be prevented.

  For example, in a pants-type disposable diaper, it has been conventionally known that a plurality of abdominal circumference stretchable materials are provided at positions corresponding to the circumference of a wearer's abdomen (for example, Patent Document 4). The elastic material around the abdomen is fixed in a stretched state around the front and back of the disposable diaper. When the elastic material around the abdomen contracts, a gather around the abdomen around the abdomen of the disposable diaper is formed. Thus, it is said that by forming gathers around the abdomen, the fit of the disposable diaper is improved, and the sliding of the diaper can be effectively prevented. In addition, by forming an abdominal gather, there is also an advantage that the flexibility of the abdomen part of the disposable diaper is increased and the wearing feeling given to the wearer is improved.

  Furthermore, when a stretchable material around the abdomen is provided in the disposable diaper, a technique is also known in which a part of the stretchable material around the abdomen is discontinuous in a region overlapping with the absorbent main body (for example, Patent Document 5), In general, since it is necessary to absorb liquid such as urine excreted by the wearer even in the abdomen portion of the disposable diaper, an absorptive main body is also provided in this abdomen portion. However, when an abdominal stretchable material is provided in the area where the absorbent main body is disposed, the entire disposable diaper is distorted due to the shrinkage force of the abdominal stretchable material, the absorbent main body is twisted, and the position of the absorbent body is There is a risk of slipping. Therefore, in the region overlapping with the absorbent main body, the distortion and positional deviation of the disposable diaper and the absorbent main body can be eliminated by making the belly stretchable material partially discontinuous.

JP 2009-254662 A JP 2010-233733 A Japanese Patent Laid-Open No. 2005-323585 JP 2011-50484 A JP 2010-125127 A JP-A-7-157728

  However, in the conventional disposable diaper, the waist elastic material disposed in the waist area is continuously disposed over the entire periphery of the waist opening. For this reason, due to the shrinking action of the waist stretchable material, the waist circumference of the disposable diaper is distorted, and the overall shape of the disposable diaper is destroyed. For example, FIG. 9A shows an example of a conventional disposable diaper in which waist elastic materials are continuously arranged over the entire periphery of the waist opening. As shown in FIG. 9 (a), when the waist elastic material is disposed on the entire periphery of the waist opening, wrinkles particularly gather at the center of the waist around the disposable diaper. For this reason, the center part of the waist circumference part was distorted severely, and the malfunction that the height of the center part of the waist circumference part and the height of both right and left end parts became uneven occurred.

  In particular, as shown in FIG. 9A, in a conventional disposable diaper 1000 (crosslinked disposable diaper) of a type in which an absorption main body 1030 is bridged between a front body exterior body 1010 and a back body exterior body 1020. In order to prevent the disposable diaper from slipping down as much as the tightening around the legs of the wearer is alleviated, the waist elastic material 1051 is fixed at the waist with a high elongation rate. For this reason, in the conventional disposable diaper 1000, the distortion generated in the waist circumference portion described above is more prominent as compared with other types of disposable diapers.

  Further, as shown in FIG. 9 (a), a disposal tape 1040 is generally attached to the conventional disposable diaper 1000 on the back body side. The disposal tape 1040 has a function of winding up the disposable diaper that has been rounded compactly, in order to hold the disposable diaper in a rounded state. In a general disposable diaper, as shown in FIG. 9B, the disposal tape 1040 includes a base piece that adheres to the diaper, an intermediate piece that continues to the base piece, and an uppermost piece that continues to the intermediate piece. And is bonded to the outer surface of the diaper in a state of being folded back at the connecting point of each piece and folded into a Z shape (for example, Patent Document 5). The disposal tape 1040 is preferably disposed as close to the edge of the waist opening as possible in order to wind up the disposable diaper after use.

However, as described above, in the conventional disposable diaper 1000, a plurality of waist elastic members 1051 are arranged along the entire periphery of the waist opening. Further, since a crease (gather) is generated at the place where the waist elastic material 1051 is disposed due to the contraction force of the waist elastic material, the disposal tape 1040 is attached close to the edge of the waist opening. I couldn't.
Further, when the disposal tape 1040 is provided close to the place where the waist elastic material 1051 is disposed, there is a problem that the waste tape is easily peeled off due to the influence of wrinkles generated when the waist elastic material 1051 contracts. . In other words, if wrinkles occur due to the waist elastic material, as shown in FIG. 9 (b), the folded portion of the base piece and the intermediate piece of the disposal tape 1040 (shown by broken circles in FIG. 9 (b)). May be peeled off the outer surface of the disposable diaper. As described above, if even a part of the disposal tape 1040 is peeled off from the outer surface of the disposable diaper, the entire disposal tape 1040 is easily peeled off, or the portion removed from the outer surface of the disposable diaper is another diaper in the manufacturing process. There is a problem that the manufacturing process becomes complicated.
Therefore, conventionally, the disposal tape 1040 has to be attached at a position away from the edge of the waist opening and the waist elastic material, and the entire length of the disposal tape 1040 has to be formed longer than necessary. It was.

  Therefore, at present, there is a need for a disposable diaper, a method for manufacturing the same, and a device for manufacturing the same that can prevent the waist opening from being distorted due to the contracting action of the waist elastic material and the outer shape of the disposable diaper to be destroyed. Yes. In addition, a disposable diaper capable of disposing a disposal tape for wrapping a disposable diaper after use as close to the edge of the waist opening as possible, a manufacturing method thereof, and a manufacturing apparatus thereof It has been demanded.

Therefore, as a result of intensive studies on the means for solving the problems of the conventional invention, the inventor of the present invention has determined that the waist stretchable material disposed around the abdomen of the disposable diaper is the front body side or the back of the disposable diaper. It was found that discontinuous provision at the center of the body in the width direction can prevent the waist opening from being distorted by the shrinkage of the waist stretch material. Then, the present inventor has realized that the conventional problems can be solved based on the above knowledge, and has completed the present invention.
Specifically, the present invention has the following configuration.

The 1st side of the present invention is related with a disposable diaper.
In the disposable diaper of the present invention, first, a plurality of waist elastic members 51 are provided in a direction along the edge of the waist 1 in the vicinity of the edge forming the waist opening.
And some or all of the plurality of waist elastic members 51 are discontinuously provided at the center in the width direction on either the front body side or the back body side of the disposable diaper.

  As described above, by making the plurality of waist elastic members discontinuous in the waist area of the disposable diaper, it is possible to prevent the waist area from being distorted by the contraction action of the waist elastic material. Furthermore, if the waist stretchable material is discontinuous at the center in the width direction on the front or back body side of the disposable diaper, a disposal tape should be attached to the area where the waist stretchable material becomes discontinuous. Is possible. Therefore, the disposal tape can be arranged as close to the edge of the waist opening as possible.

  Further, in the disposable diaper of the present invention, at least a part of the plurality of waist elastic members 51 is discontinuously provided in the center part in the width direction on both the front body side and the back body side of the disposable diaper. There may be.

  As in the above configuration, by making the waist elastic material discontinuous at the center in the width direction on both the front body side and the back body side, the waist area is distorted by the shrinking action of the waist elastic material. It is possible to improve the balance of the outer shape of the front body side and the back body side while preventing the occurrence. In other words, since the phenomenon that the waist of the disposable diaper is extremely distorted can be eliminated at both the front body side and the back body side, the height of the width direction center part and both sides of the width direction can be reduced. Can be aligned.

Moreover, the disposable diaper of the present invention is located between the waist circumference 1 near the edge forming the waist circumference opening, the crotch 3 located in the crotch of the wearer, and between the waist circumference 1 and the crotch 3. The abdominal circumference part 2 to have.
And the absorptive main body 30 extended in the longitudinal direction of a disposable diaper centering on the abdominal circumference part 2 and the crotch part 3 is provided.
The abdomen circumference part 2 is provided with a plurality of abdomen circumference elastic members 52 along the width direction of the disposable diaper.
Here, the plurality of belly stretchable members 52 are preferably provided discontinuously at the central portion of the absorbent main body 30.

  As in the above configuration, by providing a plurality of belly stretchable materials around the abdomen of the disposable diaper, the fit between the disposable diaper and the wearer's body is improved. Moreover, it can prevent that an absorptive main body distortion | strain by providing a several belly circumference elastic material discontinuously. Furthermore, in the above configuration, the region where the waist elastic material is discontinuous and the region where the belly elastic material is discontinuous are both located in the center of the disposable diaper in the width direction. Distortion can be prevented from occurring in the central part of the disposable diaper, which is likely to be distorted, and the shape of the entire disposable diaper can be maintained beautifully.

  In the disposable diaper of the present invention, the waist stretchable material discontinuous region 61 where the waist stretchable material 51 is discontinuous is more than the waist stretchable material discontinuous region 62 where the belly stretchable material 52 is discontinuous. However, it is preferable that the length of the disposable diaper in the width direction is short.

  For example, if the waist stretchable material discontinuous region is larger than the abdominal stretchable material discontinuous region, the tightening force of the waist stretchable material is reduced, and the disposable diaper falls from the wearer's body. . For this reason, it is preferable that the waist stretchable material discontinuous region is formed at least shorter than the belly stretchable material discontinuous region. Thereby, the distortion which generate | occur | produces in the center part of a disposable diaper can be eliminated effectively, ensuring the suitable fastening force of the grade which a disposable diaper does not slip | deviate from a wearer's body.

The disposable diaper of the present invention preferably further includes a disposal tape 40 for holding the disposable diaper in a rolled state when the disposable diaper is discarded.
And it is preferable that the disposal tape 40 is attached so that all or a part of the disposal tape is located in either the waist or stretchable material discontinuous region 61 of the front body or the back body.

  As shown in the above configuration, attaching the disposal tape to the area where the waist elastic material is discontinuous (the waist elastic material discontinuous area) brings the waste tape closer to the edge of the waist opening. Can be arranged. Furthermore, since the waist elastic material is discontinuous, the waste tape is not easily peeled off due to the shrinkage effect of the waist elastic material. For this reason, the disposal tape makes it easy to hold and hold the curled disposable diaper.

The 2nd side surface of this invention is related with the manufacturing apparatus of a disposable diaper.
The disposable diaper manufactured by the manufacturing apparatus of the present invention includes a waist circumference portion 1 in the vicinity of an edge forming a waist circumference opening, a crotch portion 3 located at a wearer's crotch, and a waist circumference portion and a crotch portion. The abdominal circumference part 2 is located. The waist 1 is provided with a plurality of waist elastic members 51 on the outer sheet along the width direction of the disposable diaper. The waist 2 is provided on the outer sheet along the width direction of the disposable diaper. A plurality of belly stretchable members 52 are provided. Moreover, the absorptive main body 30 extended in the longitudinal direction of a disposable diaper centering on the abdominal circumference part 2 and the crotch part 3 is provided.
And the manufacturing apparatus of this invention has a waist circumference elastic material attachment part, an abdominal circumference elastic material attachment part, and an elastic material cutting part.
The waist stretchable material attaching part has a non-adhesive part 51a located at the waist part 1 of the disposable diaper at the center in the width direction on the front body side or the back body side of the disposable diaper. The plurality of waist elastic members 51 are attached in an extended state so that the adhesive portions 51b are located on both sides.
Further, the abdominal circumference elastic material attaching part has a non-adhesive part 52a located at the center part in the width direction on the front body side or the back body side of the disposable diaper in the abdominal circumference part 2 of the disposable diaper, and the width of the non-adhesive part 52b. A plurality of belly stretchable members 52 are attached in an extended state so that the adhesive portions 52b are located on both the left and right sides in the direction.
The stretchable material cutting section cuts the waist elastic material 51 at the non-bonded portion 52a of the waist elastic material 52 while cutting the waist elastic material 51 at the non-bonded portion 51a of the waist elastic material 51, and The surrounding elastic material 51 and the belly elastic material 52 are made discontinuous.
As a result, in the non-bonded portions 51a and 52a, the waist elastic member 51 and the belly elastic member 52 that have been stretched are released from the stretched state and contracted in the left-right direction from the cutting position. Therefore, the waist elastic member 51 and the abdominal elastic member 52 are located in the bonded portions 51b and 52b, and the waist elastic material 51 and the abdominal elastic material 52 are discontinuous in the non-adhered portions 51a and 52a. Disposable diapers are manufactured.

  As described above, the manufacturing apparatus of the present invention can make the waist elastic material and the belly elastic material discontinuous almost simultaneously by the elastic material cutting part. For this reason, it is not necessary to provide separate means for discontinuous the waist elastic material and the waist elastic material, and the manufacturing process can be speeded up, the manufacturing apparatus can be simplified, and the manufacturing cost can be reduced. Therefore, according to the manufacturing method of this invention, the disposable diaper from which the distortion in the center part of the width direction was eliminated can be manufactured efficiently.

  In the manufacturing apparatus of the present invention, the stretchable material cutting portion preferably includes an anvil roller 241 having a smooth surface and a cutter roller 242 having a cutting blade portion 243 at positions facing each other. Further, the outer sheet is arranged between the anvil roller 241 and the cutter roller 242 so that the extending directions of the waist elastic member 51 and the belly elastic member 52 are orthogonal to the rotation axes of the anvil roller 241 and the cutter roller 242. Is introduced. The waist elastic member 51 and the belly elastic member 52 on the outer sheet are pressure cut by the cutting blade portion 243 of the cutter roller 242.

  As in the above configuration, by introducing an outer sheet between the anvil roller and the cutter roller and cutting the waist stretchable material and the belly stretchable material almost simultaneously, it is possible to manufacture disposable diapers in the flow work Become. This speeds up the production of disposable diapers.

In the manufacturing apparatus of the present invention, the stretchable material cutting unit may include an ultrasonic vibration device 244 and a cutter roller 242. The ultrasonic vibration device 244 is disposed on one surface side of the outer sheet and generates frictional heat on the one surface of the outer sheet by fine vibration.
The cutter roller 242 faces the ultrasonic vibration device 244 and is rotatably disposed on the other surface side of the outer sheet. The cutter roller 242 has a cutting blade portion 243 on the surface facing the ultrasonic vibration device 244.
The waist elastic member 51 and the belly elastic member 52 on the outer sheet can be melted by frictional heat by passing the ultrasonic vibration device 244 and the cutting blade portion 243 in a pressure contact state.

  According to the above configuration, the sheet is introduced between the cutter roller 242 provided with the cutting blade portion and the ultrasonic vibration device 244 that finely vibrates, and is passed through pressure contact, so that frictional heat generated by rubbing the ultrasonic vibration device and the sheet is generated. Since the waist elastic member 51 and the belly elastic member 52 in the seat can be fused, it is possible to prevent each elastic member from being cut and to suppress the deterioration of the cutting blade. is there.

In the manufacturing apparatus of the present invention, the cutter roller 241 preferably has a plurality of cutting blade portions 243 provided at a predetermined angle with respect to the rotation axis of the cutter roller 242.
Further, the plurality of cutting blade portions 243 include a first cutting blade portion 243a that cuts the waist elastic member 51 on the front body side of the disposable diaper, and a first cutting blade portion 243a that cuts the waist elastic material 51 on the rear body side of the disposable diaper. The second cutting blade portion 243b, the third cutting blade portion 243c for cutting the front waist side elastic material 52 on the front body side of the disposable diaper, and the fourth cutting portion for the back waist side elastic material 52 on the rear body side of the disposable diaper. It is preferable to have a cutting blade portion 243d.
The first cutting blade portion 243a, the second cutting blade portion 243b, the third cutting blade portion 243c, and the fourth cutting blade portion 243d are other cutting blade portions in the rotation axis direction of the cutter roller 242. It is preferable to be provided at a position that does not overlap any of the above.

  By arranging the cutting blade portion of the cutter roller at a predetermined angle with respect to the rotation axis of the cutter roller as in the above configuration, each elastic material can be cut without lowering the linear pressure of the cutting blade portion. It becomes possible. Further, a first cutting blade portion, a second cutting blade portion, a third cutting blade portion, and a fourth cutting blade portion are formed, and the position of each cutting blade portion is the rotation axis of the cutter roller. By avoiding overlapping with any of the other cutting blades in the direction, the elastic material is not cut at two or more points at the same time. That is, if the elastic material is cut at two or more points at the same time, the linear pressure of the cutting blade may decrease, and the elastic material may not be cut. However, the cutting blade is always cut so that the elastic material can be cut at one point. By designing the arrangement, the linear pressure can be prevented from decreasing and the stretchable material can be cut without interruption.

The 3rd side surface of this invention is related with the manufacturing method of a disposable diaper.
The disposable diaper manufactured by the manufacturing method of the present invention includes a waistline portion 1 in the vicinity of an edge forming a waistline opening, a crotch part 3 positioned at the wearer's crotch, and a space between the waistline part and the crotch part. The abdominal circumference part 2 is located. The waist 1 is provided with a plurality of waist elastic members 51 on the outer sheet along the width direction of the disposable diaper. The waist 2 is provided on the outer sheet along the width direction of the disposable diaper. A plurality of belly stretchable members 52 are provided. Moreover, the absorptive main body 30 extended in the longitudinal direction of a disposable diaper centering on the abdominal circumference part 2 and the crotch part 3 is provided.
And the manufacturing method of this invention includes a waist circumference elastic material attachment process, an abdominal circumference elastic material attachment process, and an elastic material cutting process.
The waist elastic material attaching step includes a non-adhesive portion 51a located at the waist portion 1 of the disposable diaper at the center in the width direction of the front body side or the back body side of the disposable diaper, and the width direction left and right of the non-adhesive portion 51a. The plurality of waist elastic members 51 are attached in an extended state so that the adhesive portions 51b are located on both sides.
Further, in the abdominal circumference stretchable material attaching step, the non-adhesive portion 52a is positioned in the center of the disposable diaper in the width direction of the front body side or the back body side of the disposable diaper, and the width of the non-adhesive portion 52b. A plurality of belly stretchable members 52 are attached in an extended state so that the adhesive portions 52b are located on both the left and right sides in the direction.
In the elastic material cutting step, the waist elastic material 51 is cut at the non-bonded portion 51 a of the waist elastic material 51, while the waist elastic material 52 is cut at the non-bonded portion 52 a of the waist elastic material 52. The surrounding elastic material 51 and the belly elastic material 52 are made discontinuous.
As a result, in the non-bonded portions 51a and 52a, the waist elastic member 51 and the belly elastic member 52 that have been stretched are released from the stretched state and contracted in the left-right direction from the cutting position. Therefore, the waist elastic member 51 and the abdominal elastic member 52 are located in the bonded portions 51b and 52b, and the waist elastic material 51 and the abdominal elastic material 52 are discontinuous in the non-adhered portions 51a and 52a. Disposable diapers are manufactured.

  By cutting the stretchable waist elastic material as described above, the waist elastic material can be easily discontinuous at high speed. For this reason, according to the manufacturing method of this invention, the disposable diaper from which distortion | strain of the waist circumference part was eliminated can be manufactured efficiently.

  As described above, according to the present invention, a disposable diaper that can prevent a situation in which the waist opening is distorted by the contraction action of the waist elastic material and the outer shape of the disposable diaper is destroyed, its manufacturing method, and its manufacturing apparatus. Can provide. In addition, a disposable diaper that can dispose of a disposal tape for winding up a disposable diaper after use as close to the edge of the waist opening as possible, a manufacturing method thereof, and a manufacturing apparatus thereof Can be provided.

FIG. 1 is a perspective view showing an example of the disposable diaper of the present invention. FIG. 2 is a development view showing an example of the disposable diaper of the present invention. FIG. 3 is a cross-sectional view showing an example in which the disposable diaper is cut along the line XX in FIG. FIG. 4 is a cross-sectional view showing an example of another embodiment of the present invention. FIG. 5 is a cross-sectional view showing an example of another embodiment of the present invention. FIG. 6 is a schematic diagram for explaining a cushion structure applicable to the present invention. FIG. 7 is a perspective view showing an outline of the manufacturing apparatus of the present invention. FIG. 8 is a schematic side view showing a preferable shape and arrangement of the cutting blade portion of the cutter roller. FIG. 9 is a perspective view showing an outline of a manufacturing apparatus according to another embodiment of the present invention. FIG. 10 is a perspective view showing an outline of a manufacturing apparatus according to still another embodiment of the present invention. FIG. 11 is a diagram for explaining a conventional disposable diaper.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.
Here, in the present specification, “A to B” means “A or more and B or less”.
In the present specification, the “longitudinal direction” of the disposable diaper basically means the direction connecting the front body and the back body (vertical direction in FIG. 2), and the “width direction” means the basic direction. Specifically, it means a direction (left-right direction in FIG. 2) orthogonal to the longitudinal direction.

(1. disposable diapers)
First, a disposable diaper according to the present invention will be described.
Hereinafter, in the present invention, specifically, among the pants-type disposable diapers, the outer sheet is separated at the front body and the back body, and the absorbent main body is crosslinked between the front body exterior body and the back body exterior body. A disposable disposable diaper will be described as an example. However, in the present invention, a pants-type disposable diaper in which an exterior sheet is hung from the front body to the back body and an adhesive tape is attached to both sides of the front body or the back body, and the front body is used by using the adhesive tape when worn. The present invention can also be applied to a tape-type disposable diaper that bonds the back and back parts.

(1-1. Overall configuration of disposable diapers)
FIG. 1 is a schematic view showing a first embodiment of a cross-linked disposable diaper 100, and shows a state where the disposable diaper 100 is viewed from the back body exterior body 2 side. FIG. 2 is a development view of the disposable diaper 100 shown in FIG. 1, and shows a state in which the disposable diaper 100 is viewed from the surface that contacts the wearer's skin (skin contact surface). In FIG. 2, various sheet materials constituting the disposable diaper are transparently drawn in order to show the positional relationship between the stretchable materials arranged in various places. Moreover, FIG. 3 is sectional drawing which shows the example of the state which cut | disconnected the disposable diaper 100 in the longitudinal direction in the line segment of XX in FIG. In addition, although the various sheet | seat materials which form a disposable diaper are usually very thin things, in FIG. 3, it has drawn conceptually with thickness.

  As shown in FIGS. 1 and 2, the disposable diaper 100 includes a front body exterior body 10, a rear body exterior body 20, and an absorbent main body 30. The front body exterior body 1 is located on the front body side that contacts the wearer's abdomen when worn, and the back body exterior body 20 is located on the back body side that contacts the wearer's back when worn. The absorbent main body 30 has one end side in the longitudinal direction fixed to the front body exterior body 1 and the other end side fixed between the rear body exterior body 20. For this reason, in this invention, the absorptive main body 30 is in the state bridge | crosslinked between the front body exterior body 10 and the back body exterior body 20. FIG. As means for fixing the absorbent main body 30 to the front body exterior body 10 and the back body exterior body 20, known means can be used. For example, a hot melt adhesive or other fluid adhesive is used. It may be fixed by a fixing method, or may be fixed by heat welding such as heat sealing or ultrasonic welding.

  Further, as shown in FIG. 1, both side edges in the width direction of the front body exterior body 10 and the back body exterior body 20 are joined to each other, so that the front body exterior body 10 and the back body exterior body 20 are connected in an annular shape. . For this reason, as shown in FIG. 1, a waist circumference opening 4 positioned around the wearer's waist when worn and a leg circumference opening 5 located around the wearer's leg when worn. In this way, a crosslinked disposable diaper 100 is formed. The wearer puts both legs into the waist opening 4 so that the abdomen is in contact with the front body exterior body 10 and the back is in contact with the back body exterior body 20, and each leg is placed around the leg. By taking out from the opening part 5, the bridge | crosslinking type disposable diaper 100 can be mounted | worn.

  Further, as shown in FIG. 2, the disposable diaper 100 includes a waist circumference portion 1 in the vicinity of an edge forming the waist circumference opening 4, a crotch portion 3 located in the crotch of the wearer, and a waist circumference portion 1. It is divided into an abdominal area 2 located between the crotch 3. The waist circumference portion 1 is an area where a plurality of waist circumference elastic members 51 are arranged. Further, the abdominal circumference portion 2 is an area where a plurality of abdominal circumference stretchable materials 52 are arranged. Moreover, the absorptive main body 3 is arrange | positioned centering on the crotch part 3 and extended in the longitudinal direction of a disposable diaper.

  “The vicinity of the edge forming the waist opening 4” (waist waist 1) is, for example, from the edge forming the waist opening 4 to the position where the absorbent body 31 of the absorbent main body 30 exists. Means an area. Further, “the vicinity of the edge forming the waist opening 4” (waist waist 1) means, for example, the region from the edge forming the waist opening 4 to the position where the absorbent main body 30 exists. , May mean. It is preferable that at least the waist elastic member 51 disposed in the waist circumference portion 1 does not overlap with the absorbent body 31 of the absorbent main body 30.

(1-2. Configuration of each part of disposable diaper)
Next, each part structure of the disposable diaper 100 which concerns on 1st Embodiment is demonstrated concretely using drawing.

(1-2-1. Front body exterior body and back body exterior body)
The front body exterior body 10 and the back body exterior body 20 are in contact with the wearer's abdomen and back, and absorbability located between the front body exterior body 10 and the back body exterior body 20 when the disposable diaper 100 is worn. It is a member for suspending the main body 30.

  In the developed view shown in FIG. 2, the front body exterior body 10 includes a long side that is a side that becomes the waist circumference end, both sides that are joint portions of the back body exterior body 20, and the absorbent main body 30. The shape has a short side that is a side to be joined and a hypotenuse that connects both sides and the short side. Similarly, the back body exterior body 20 is also a side where the long side that is the side that becomes the waist circumference end, both sides that are the joint portion of the front body exterior body 10, and the absorbent main body 30 are joined. The shape has a short side and a hypotenuse that connects both sides and the short side. However, for the front body exterior body 10, the slope of the hypotenuse connecting both sides and the short side is. The back body exterior body 20 is gentler than the slope of the hypotenuse connecting the both side pieces and the short side. For this reason, even when the front body exterior body 10 and the back body exterior body 20 are joined, the leg periphery opening 5 is relatively wide on the front body exterior body 10 side, and the wearer's leg portion is Easy to move.

  Both side edges of the front body exterior body 10 and the back body exterior body 20 are overlapped with each other and joined by a known joining means such as heat embossing or sonic welding.

  The front body exterior body 10 is basically configured by overlapping an inner sheet 11 and an outer sheet 12. Between the inner sheet 11 and the outer sheet 12, a plurality of waist elastic members 51 and a plurality of belly elastic members 52 are disposed along the width direction of the disposable diaper. Similarly, the front body exterior body 10 is basically configured by overlapping an inner sheet 21 and an outer sheet 22. Between the inner sheet 21 and the outer sheet 22, a plurality of waist elastic members 51 and a plurality of belly elastic members 52 are disposed along the width direction of the disposable diaper.

  The front body exterior body 10 and the back body exterior body 20 have basically the same configuration. For this reason, the structure demonstrated below about the front body exterior body 1 can employ | adopt the same structure also in the back body exterior body 20. FIG.

(1-2-1-1. Inner sheet and outer sheet)
3 is a cross-sectional view showing a state in which the disposable diaper 100 is cut in the longitudinal direction along the line XX in FIG. In FIG. 3, the right side is the surface that contacts the wearer's skin when worn (skin contact surface), and the left side is the surface that does not contact the wearer's skin when worn (skin non-contact surface). is there. As shown in the cross-sectional view of FIG. 3, the front body exterior body 10 and the back body exterior body 20 are configured by overlapping inner sheets 11, 21 and outer sheets 12, 22. The inner sheets 11 and 21 are disposed on the skin contact surface side, and the outer sheets 12 and 22 are disposed on the skin non-contact surface side. As shown in FIG. 3, the absorbent main body 30 is bonded to the inner sheets 11 and 21. The outer sheets 12 and 22 are folded back to the skin contact surface side at the edge forming the waist opening 4 so as to cover the end of the absorbent main body 30 from the skin contact surface side. Yes. For this reason, the absorbent main body 30 is partially located between the inner sheets 11 and 21 and the outer sheets 12 and 22. And the absorptive main body 30 is fixed to the front body exterior body 10 and the back body exterior body 20 so that it may be clamped between the inner sheets 11 and 21 and the outer sheets 12 and 22.

  The inner sheets 11 and 21 and the outer sheets 12 and 22 are formed of, for example, a flexible fiber nonwoven fabric, a plastic sheet, or a laminate sheet thereof. The inner sheets 11 and 21 and the outer sheets 12 and 22 are bonded by, for example, a hot melt adhesive. Further, between the inner sheets 11 and 21 and the outer sheets 12 and 22, a plurality of waist elastic members 51 and a plurality of belly elastic members 52 are fixed in an extended state along the width direction of the disposable diaper. Yes.

(1-2-1-2. Elastic material around waist)
The waist elastic material 51 is disposed in an elongated state along the vicinity of the edge of the waist opening 4 formed by the front body exterior body 10 and the back body exterior body 20, and contracts to provide a waist circumference for the disposable diaper. This is a member for forming a waist gather near the opening 4.

  As shown in FIG. 3, the waist elastic material 51 is fixed in an extended state between the inner sheets 11 and 21 and the outer sheets 12 and 22. The number of waist elastic members 51 is preferably two or more, and may be, for example, 2 to 15, 4 to 12, or 6 to 9. The plurality of waist elastic members 51 are arranged at predetermined intervals in the longitudinal direction of the disposable diaper, for example, as shown in FIG. The plurality of waist elastic members 51 are preferably juxtaposed substantially in parallel.

  In addition, as shown in FIG. 2, the waist elastic material 51 is disposed in the waist 1 of the disposable diaper. In the example shown in FIG. 2, the waist circumference 1 is an area from the edge of the waist circumference opening 4 to the position where the absorbent body 31 of the absorbent main body 30 is formed. For this reason, the waist elastic material 51 is arranged without overlapping the absorbent body 31 of the absorbent main body 30.

  In addition, as shown in FIG. 2, the plurality of waist elastic members 51 are discontinuous in the central portion of the disposable diaper in the width direction, and the waist elastic members 51 are discontinuous. A continuous region 61 is formed. The waist stretchable material discontinuous region 61 may be formed in either the front body exterior body 10 or the back body exterior body 20, but is formed in both the front body exterior body 10 and the back body exterior body 20. It is preferable. Further, in the example shown in FIG. 2, the plurality of waist elastic members 51 formed in the waist region 1 are all discontinuous, but in the present invention, of the plurality of waist elastic members 51. , At least a part is required to be discontinuous.

  As described above, in the waist circumference portion 1 of the disposable diaper, the plurality of waist circumference stretchable materials 51 are discontinuous, so that the center portion of the waist circumference portion 1 is distorted by the contraction action of the waist circumference stretchable material 51. Can be prevented. For this reason, for example, as shown in FIG. 1, the phenomenon that the waist 1 of the disposable diaper 100 is extremely distorted can be eliminated. Can be aligned.

  Further, if the waist elastic material 51 is discontinuous, for example, as shown in FIG. 1, the disposal tape 40 is attached to the waist elastic material discontinuous region 61 where the waist elastic material 51 is discontinuous. It is also possible. As the disposal tape 40, a known configuration can be adopted. For example, the disposal tape 40 has a base piece that adheres to the diaper, an intermediate piece that continues to the base piece, and an uppermost piece that continues to the intermediate piece, and is folded at the connecting point of each piece and folded into a Z shape. In this state, it is possible to use a diaper bonded to the outer surface. By disposing the disposal tape 40 as close as possible to the edge of the waist opening, even after the disposal tape 40 has a relatively short length, the disposable diaper after use can be sufficiently used. Demonstrates the ability to hold in a rolled state. For this reason, the material cost of the disposal tape 40 can be reduced.

  Moreover, the length WD in the width direction of the waist stretchable material discontinuous region 61 is, for example, 3% to 25% with respect to the length W in the width direction of the entire front body exterior body 10 (or the back body exterior body 20). %, 5% to 20%, 7% to 15%, or 10% to 13%. When the length WD in the width direction of the waist stretchable material discontinuous region 61 is less than 5% with respect to the width W of the entire body exterior body 1, distortion generated in the waist 1 is eliminated. I can't. On the other hand, when the value of WD exceeds 25% with respect to the value of W, the fastening force by the waist elastic member 51 is reduced, and the disposable diaper 100 may be displaced from the wearer's body. For this reason, the value of WD is preferably 3% to 25% with respect to the value of W.

  Moreover, although mentioned later, in the example shown by FIG.1 and FIG.2, the belly circumference elastic material 52 provided in the stomach periphery part 2 of the disposable diaper is also provided discontinuously in the width direction center part of a disposable diaper. ing. For this reason, a region where the abdominal circumference stretchable material 52 is discontinuous (abdominal circumference stretchable material discontinuous region 62) is formed. At this time, the length WD in the width direction of the waist elastic member discontinuous region 61 is preferably shorter than the length TD in the width direction of the belly elastic member discontinuous region 62. Specifically, the value of WD is preferably, for example, 20% to 95%, 30% to 80%, or 40% to 70% with respect to the TD value.

  In FIG. 2, reference signs C <b> 1 and C <b> 2 indicate cut marks of the waist elastic members 51 in the front body exterior body 10 and the back body exterior body 20. That is, for example, when the waist stretchable material 51 of the front body exterior body 10 is formed discontinuously, the center part in the width direction becomes a non-adhesive part in the waist circumference part 1 of the outer sheet 12 of the front body exterior body 10, and the width direction A plurality of stretched waist elastic members 51 are fixed so that the left and right side portions are bonded portions. At this time, when the outer sheet 12 and the waist elastic material 51 are fixed, for example, an adhesive may be applied on the outer sheet, and the waist elastic material 51 may be disposed on the adhesive. For example, after applying an adhesive directly to the waist elastic material 51 by a known slit coat coating method or a sheath coating method, the waist elastic material 51 to which the adhesive is applied may be disposed on the outer sheet 12. Good. Thereafter, the stretchable waist elastic material 51 is covered with the inner sheet 11 and sandwiched between the outer sheet 12 and the inner sheet 11. Then, the waist elastic member 51 is cut at the non-bonded portion at the location indicated by the reference C1. As a result, the stretchable material around the waist that has been stretched is released from the stretched state at the non-bonded portion, and contracts in the left-right direction from the cutting position. In this manner, a disposable diaper in which the waist elastic material 51 is discontinuous can be manufactured.

  A known elastic elastic member can be used for the waist elastic material 51. For example, thread elastic rubber or flat elastic rubber can be used for the waist elastic member 51. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used. The material for forming the waist elastic material 51 is not necessarily limited to these materials, and various known materials having elasticity such as a thermoplastic elastomer, a plastic sheet, or a rubber sheet can be used. . It is particularly preferable to use a thermoplastic elastomer. Examples of the thermoplastic elastomer include styrene elastomers, olefin elastomers, polybutadiene elastomers, polyester elastomers, polyamide elastomers, urethane elastomers, vinyl chloride elastomers, and fluorine elastomers. , Ionomer resins, or silicone resins can be used. These thermoplastic elastomers may be used alone or in combination of two or more.

  Further, it is preferable to use a material having a larger core diameter and stronger tensile strength than the waist elastic material 52 as the waist elastic material 51. Since the waist elastic member 51 is formed of another material having a higher tensile strength than the waist elastic material 52, the degree of adhesion between the waist 1 of the disposable diaper and the wearer's body can be increased. It is possible to prevent an accidental shift.

(1-2-1-3. Elastic material around the abdomen)
The abdominal circumference stretchable material 52 is arranged in an extended state in the width direction in the abdominal circumference part 2 of the front body exterior body 1 and the back body exterior body 2, and contracts to the abdominal circumference part 2 of the disposable diaper. It is a member for forming an abdominal gather.
As shown in FIG. 2, the plurality of belly stretchable members 52 are arranged on the belly circumference part 2 where the absorbent body 31 of the absorbent main body 3 is located, of the front body exterior body 1 and the back body exterior body 2. ing. The plurality of belly stretchable members 52 are fixed in an extended state between the inner sheets 11 and 21 and the outer sheets 12 and 22 that constitute the front body exterior body 1 and the back body exterior body 2. For this reason, when the plurality of abdominal circumference elastic members 52 contract, abdominal circumference gathers are formed in the abdominal circumference portions 2 of the front body exterior body 1 and the back body exterior body 2.

  It is preferable that the number of the plurality of belly stretchable members 52 is, for example, 10 to 30, 12 to 28, 15 to 25. The number of the plurality of belly stretchable members 52 is preferably greater than the number of the plurality of waistline stretchable members 51 described above. Moreover, it is preferable that the belly circumference elastic material 52 is formed linearly in the width direction of the front body exterior body 1 and the back body exterior body 2. Moreover, it is preferable that each of the plurality of abdominal circumference elastic members 52 is disposed substantially in parallel.

  As shown in FIG. 2, when the disposable diaper is viewed from the surface (skin contact surface) side that comes into contact with the wearer's skin, some of the plurality of belly stretchable materials 52 overlap with the absorbent main body 30. Has been placed. Further, among the plurality of belly stretchable members 52, the one that overlaps with the absorbent body 31 of the absorbent main body 30 is partially discontinuously formed at the center in the width direction of the front body exterior body 1 and the back body exterior body 2. Has been. Here, the abdominal circumference stretchable material 52 is not a completely discontinuous region where the absorbent body 31 overlaps the absorbent body 31, and the abdominal circumference stretchable material 52 is partially part of the absorbent body 30. It may be superposed on the absorber 31.

  A known elastic elastic member can be used for the belly circumference elastic material 52. For example, it is preferable to use thread-like elastic rubber for the belly stretchable material 52. For example, it is preferable that the abdominal circumference elastic material 52 employs a rubber thread having a smaller core diameter and a lower tensile strength than the waist circumference elastic material 51. In the abdominal circumference part 2, by arranging the abdominal circumference elastic member 52 having a low tensile strength, it is possible to avoid giving an unnecessary feeling of pressure while fitting the disposable diaper to the abdomen of the 100 wearer.

  Further, in FIG. 2, reference numerals C <b> 3 and C <b> 4 indicate cut marks of the abdominal circumference stretchable material 52 in the front body exterior body 10 and the back body exterior body 20. That is, for example, when forming the elastic material 52 around the abdomen of the front body exterior body 10 discontinuously, the center part in the width direction becomes a non-adhesive part in the abdomen circumference part 2 of the outer sheet 12 of the front body exterior body 10. A plurality of stretched belly stretchable materials 52 are fixed on the outer sheet 12 so that the left and right side portions are bonded portions. At this time, when fixing the outer sheet 12 and the abdominal stretchable material 52, for example, an adhesive may be applied on the outer sheet, and the abdominal stretchable material 52 may be disposed on the adhesive. The abdomen stretchable material 52 coated with the adhesive may be disposed on the outer sheet after the adhesive is directly applied to the abdomen stretchable material 52 by a known slit coat coating method or a sure wrap coating method. Thereafter, the stretched belly stretchable material 52 is covered with the inner sheet 11 and sandwiched between the outer sheet 12 and the inner sheet 11. And the abdominal circumference elastic material 52 is cut | disconnected in the non-bonding part in the location shown by code | symbol C1. As a result, the stretchable material 52 around the abdomen that has been stretched is released from the stretched state at the non-bonded portion, and contracts in the left-right direction from the cutting position. In this way, it is possible to manufacture a disposable diaper in which the belly stretchable material 52 is discontinuous.

(1-2-3. Absorbent body)
The absorbent main body 30 is held in a state of being bridged between the front body exterior body 10 and the back body exterior body 20, and is positioned on the wearer's abdomen 2 and crotch 3 when the disposable diaper 100 is worn. It is a member for absorbing and holding liquid such as urine excreted by the wearer.

  FIG. 3 is a cross-sectional view of the disposable diaper 100 taken along the line XX shown in FIG. The absorptive main body 30 has an absorbent body 31, a top sheet 32, a back sheet 33, a three-dimensional gather 34, and a cover sheet 35 as a basic configuration.

(1-2-3-1. Absorber)
The absorber 31 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 31 is disposed between a liquid-permeable top sheet 32 and a liquid-impermeable back sheet 33. The absorber 31 has a function of absorbing the liquid that has passed through the top sheet 32 and is made of an absorbent material.

  As the absorbent material constituting the absorber 31, a known material can be adopted. As the absorbent material, for example, flap pulp, superabsorbent polymer, or hydrophilic sheet may be used. In addition, as the absorbent material, one kind of flap pulp, superabsorbent polymer, or hydrophilic sheet may be used alone, or two or more kinds may be used in combination. The absorbent material is usually formed and used in a single-layer or multi-layer mat shape. Further, the absorbent material may be surrounded by a nonwoven fabric such as tissue to protect the pulp and polymer from being thrown out.

  The absorber 31 is preferably enclosed in a region between the top sheet 32 and the back sheet 33. That is, it is preferable that the top sheet 32 and the back sheet 33 are joined to each other so as to surround the absorber 31.

(1-2-3-2. Top sheet)
The top sheet 32 is a member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorber 31. For this reason, the top sheet 32 is made of a liquid-permeable material having high flexibility. Further, the top sheet 32 is disposed so as to cover the surface of the absorber 31.

  The example of the impermeable material which comprises the top sheet 32 is a woven fabric, a nonwoven fabric, or a porous film. Further, for example, a fiber made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon, which has been subjected to a hydrophilization treatment and further made into a non-woven fabric may be used.

(1-2-3-3. Backsheet)
The back sheet 33 is a member for preventing the liquid that has passed through the top sheet 32 and absorbed by the absorber 31 from leaking. For this reason, the back sheet 33 is made of a liquid-impermeable material. The back sheet 33 is disposed so as to cover the bottom surface of the absorber 31 in order to prevent liquid leakage from the bottom surface of the absorber 31.

  An example of the impermeable material constituting the back sheet 33 is a liquid impermeable film made of polyethylene resin. In particular, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

(1-2-3-4. Solid gathers)
The three-dimensional gather 34 is a member that rises along both side edges of the absorber 31 and prevents side leakage of urine excreted by the wearer. A pair of solid gathers 34 may be formed along both side edges of the absorber 31, or two or more pairs may be formed. Since the three-dimensional gather 34 becomes a leakage barrier for urine in a standing state (a state in which the elastic elastic member contracts), urine that has not permeated through the top sheet 32 or urine that has not been absorbed by the absorber 31 can be obtained. Prevents leaks from opening around the legs of disposable diapers.

  In the three-dimensional gather 34, one or a plurality of three-dimensional gather stretchable members 53 are arranged along the longitudinal direction of the disposable diaper, and stand up by using the contraction force of the three-dimensional gather stretchable member 53. That is, the three-dimensional gather stretchable material 53 is fixed to the sheet material in a stretched state. When the three-dimensional gather stretchable material 53 contracts, the sheet material constituting the three-dimensional gather 34 contracts and the three-dimensional gather 34 rises. The position at which the three-dimensional gather expansion / contraction material 53 is disposed can be appropriately changed according to the shape of the three-dimensional gather and the shape and size of the disposable diaper, but is generally disposed near the upper edge of the three-dimensional gather 34. The

  As a sheet material constituting the three-dimensional gather 34, it is preferable to use a material having water repellency. As an example of the water-repellent material, it is preferable to use a nonwoven fabric such as spunbond or card emboss from the viewpoint of high water repellency and good air permeability. In particular, it is preferable to use a clogged nonwoven fabric such as SMS (spunbond / meltblown / spunbond) or SMMS (spunbond / meltblown / meltblown / spunbond) because of its high water pressure resistance.

(1-2-3-5. Cover sheet)
The cover sheet 35 is a member for reinforcing the back sheet 33 and improving its feel. As shown in FIG. 3, the cover sheet 35 is bonded to the skin contact surface side of the back sheet 33. As the material constituting the cover sheet 35, a woven fabric or a non-woven fabric is used. In particular, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester as a material constituting the cover sheet 35.

(1-3. Second embodiment of disposable diaper)
FIG. 4 is a cross-sectional view showing a disposable diaper according to the second embodiment of the present invention. In the second embodiment, the outer sheets 12 and 22 are folded back at the edge of the waist opening 4, and the waist elastic material 51 is disposed at a position where the outer sheets 12 and 22 are folded. That is, according to the second embodiment, the waist elastic member 51 is not sandwiched between the inner sheets 11 and 21 and the outer sheets 12 and 22 but is sandwiched between the folded portions 12a and 22a of the outer sheets 12 and 22. This is different from the first embodiment. As described above, the waist elastic member 51 may be one that folds the outer sheets 12 and 22 and is sandwiched between the folded portions 12a and 22a.

  In the second embodiment, the plurality of waist elastic members 51 are arranged at positions that do not overlap with the absorbent main body 30. That is, the waist part 1 where the plurality of waist elastic members 51 are arranged is a region from the edge forming the waist elastic member 51 to the position where the absorbent main body 30 exists.

  For example, when the disposable diaper according to the second embodiment is manufactured, first, the plurality of waist elastic members 51 and the belly elastic members 52 are attached to the inner surfaces of the outer sheets 12 and 22 in an expanded state. At this time, the waist elastic material 51 and the waist elastic material 52 are not bonded to the outer sheets 12 and 22 in the center portion in the width direction of the disposable diaper, and are bonded to the outer sheets 12 and 22 in the left and right side portions in the width direction. It has become. Next, only the abdominal circumference elastic material 52 is covered with the inner sheets 11 and 21. Then, with the abdominal circumference stretchable material 52 sandwiched between the inner sheets 11, 21 and the outer sheets 12, 22, the abdominal circumference stretchable material 52 is cut at the non-bonded portion. Thereby, the belly stretchable material 52 is discontinuous at the center in the width direction. Then, the absorptive main body 30 is fixed to the skin contact surface side of the inner sheets 11 and 21. Next, the outer sheets 12 and 22 are folded at the edge of the waist opening 4 to form the folded portions 12a and 22a. The folded portions 12a and 22a cover the end of the absorbent main body 30 from the skin contact surface side while covering the waist elastic member 51 from the skin contact surface side. The waist elastic member 51 is cut at the non-adhesive portion in a state where the waist elastic material 51 is sandwiched between the folded portions 12a and 22a of the outer sheets 12 and 22. This makes the waist elastic 51 discontinuous. In this way, in the second embodiment, a disposable diaper in which the waist elastic member 51 and the belly elastic member 52 are discontinuous can be manufactured.

(1-4. Third embodiment of disposable diaper)
FIG. 5 is a cross-sectional view showing a disposable diaper according to the third embodiment of the present invention. The third embodiment is an example in which a cushion structure is employed for waist gathers. The cushion structure means that a cushion function is provided between seat layers while arranging a plurality of waist elastic members 51 between the seat layers constituting the front body exterior body 10 and the back body exterior body 20 to improve fit. It is a structure that can reduce the stimulation given to the wearer's skin by gathering around the waist by forming a space to fulfill. More specifically, a cushion forming sheet is further arranged between the seat layers sandwiching the waist elastic material, and the sheet in contact with the skin of the wearer and the cushion forming sheet are intermittently joined in the width direction of the disposable diaper. By doing so, the space which fulfills a cushion function can be formed.

As shown in FIG. 5, cushion forming sheets 13, 23 are arranged between the folded portions 12 a, 22 a formed by folding the outer sheets 12, 22 and the plurality of belly stretchable members 51. .
The cushion forming sheet 13 is a sheet material arranged for the purpose of enhancing the cushioning properties and flexibility of the abdominal gathers. The cushion-forming sheet 13 has its skin contact surface side intermittently joined to the inward surface (non-skin contact surface side) of the folded portion 11a in a direction along the turn-up line 12. Here, “intermittently joining” means that the joining part 71 and the non-joining part 72 are continuous at a constant interval, as shown in FIG. 6.

  FIG. 6 schematically shows an enlarged portion of the front body exterior body 10 where the folded portion 12a of the outer sheet 12 is formed. 6A shows a state where the waist elastic member 51 is extended, and FIG. 6B shows a state where the waist elastic member 51 is contracted. As shown in FIG. 6, the cushion forming sheet 13 and the folded portion 12 a are intermittently joined along the extending direction of the waist elastic material 51. That is, the cushion forming sheet 13 and the folded portion 12a are joined along the extending direction of the waist elastic member 51 so that the joining portions 71 and the non-joining portions 72 are alternately continued. Thereby, when the abdominal circumference elastic material 51 shrink | contracts, as FIG.6 (b) shows, the space S arises between the cushion formation sheet 13 and the folding | returning part 12a. The space S enhances the cushioning and flexibility of the waist gathers.

  Further, as shown in the cross-sectional view of FIG. 5, among the plurality of waist elastic members 51, some (three in the example of FIG. 5) waist elastic members 51 ′ arranged near the absorbent main body 30. In addition to the cushion forming sheets 13 and 23, one or a plurality of sheet materials may be interposed between the folded portions 12a and 22a of the outer sheets 12 and 22. In the example shown in FIG. 5, the inner sheet 11, the cover sheet 35, and the cushion forming sheet 13 are arranged between the waist elastic member 51 ′ disposed near the absorbent main body 30 and the cushion forming sheet 13 on the front-covering exterior body 10 side. A back sheet 33 and a top sheet 34 are interposed. As described above, one or a plurality of sheet materials are interposed between some of the waist elastic members 51 ′ arranged near the absorbent main body 30 among the plurality of waist elastic materials 51 and the cushion forming sheet 13. By doing so, the space formed by the cushion structure can be reduced. Therefore, the lower side of the waist gathers has a structure in which the space formed by the cushion forming sheet 13 is smaller and the unevenness is suppressed compared to the upper side. Therefore, the lower side of the waist gathers has cushioning properties, but is less irritating to the wearer's skin and can exhibit high flexibility. That is, since the lower side of the waist gathers has high adhesion to the wearer's skin, the wearing feeling of the disposable diaper is improved by suppressing the unevenness due to the cushion structure as compared with the upper side.

(2. Disposable diaper manufacturing method and manufacturing apparatus)
(2-1. First Embodiment of Manufacturing Method and Manufacturing Apparatus)
Next, a preferred embodiment of a method for manufacturing a disposable diaper and a manufacturing apparatus according to the present invention will be described with reference to the drawings. FIG. 7 is a perspective view schematically showing a manufacturing apparatus 200 used in the present invention. As shown in FIG. 7, the manufacturing apparatus 200 includes an adhesive application part 210, an elastic material attaching part 220, a covering material attaching part 230, an elastic material cutting part 240, and an exterior sheet cutting part (not shown). With such a manufacturing apparatus 200, a method for manufacturing a disposable diaper is executed.

  First, a long outer sheet (12, 22) having a predetermined width is fed from a roll (not shown) and conveyed toward the downstream side of the apparatus. At this stage, the outer sheet 12 forming the front body exterior body 10 of the disposable diaper and the outer sheet 22 forming the rear body exterior body 20 are integrated as shown in FIG. Also good. The outer sheets (12, 22) are conveyed to the adhesive application unit 210 along the direction of the arrow in FIG. In the adhesive application unit 210, an adhesive is applied to one side of the outer sheet (12, 22) (the side on which the inner sheet is later attached), and the waist elastic member 51 b and the belly elastic member An adhesive portion 52b is provided. Reference numeral 51b indicates an adhesive portion to which the waist elastic member 51 is bonded later, and reference numeral 52b indicates an adhesive portion to which the belly elastic member 52 is bonded later. The waist elastic member 51b and the belly elastic member 52b are provided on the front body side and the back body side, respectively. Each bonding portion has a substantially rectangular shape, and is provided intermittently at a predetermined regular length in the longitudinal direction (flow direction) of the outer sheet (12, 22). For this reason, a space between two adjacent bonded portions is a non-bonded portion. That is, a waist elastic material non-adhesive portion 51a is formed between adjacent waist elastic material adhesive portions 51b, and similarly, an abdominal elastic material non-adhesive portion between adjacent waist elastic material adhesive portions 52b. 51b is formed. About the width | variety and length of an adhesion part, and the length of the non-adhesion part 5, it selects suitably according to the use of the elastic material affixed on an outer sheet | seat (12,22). In the present invention, it is preferable that each waist elastic member 51b is longer than each belly elastic member 52b. In other words, it is preferable that the waist stretchable material non-attachment portion 51a has a shorter length than each abdomen stretchable material non-bonded portion 52a.

  In FIG. 7, when the waist elastic material 51 and the belly elastic material 52 are fixed to the outer sheet 12, an adhesive is applied on the outer sheet 12 and various elastic materials are arranged on the adhesive. An example is shown. However, in the present invention, for example, an adhesive is intermittently applied directly to the waist stretchable material 5 and the belly stretchable material 52 in advance by a known slit coat coating method or sure wrap coating method. The waist elastic member 51 and the belly elastic member 52 to which the adhesive is intermittently applied may be fixed to the outer sheet 12.

  As shown in FIG. 7, a stretchable material attaching portion 220 is disposed on the downstream side of the adhesive application portion 210. In this stretchable material attaching portion 220, a rotatable cylindrical stretchable material guide roller 221 is disposed so that its rotation axis is orthogonal to the conveying direction of the outer sheets (12, 22). The elastic material guide roller 221 is disposed so that its peripheral surface is in contact with the outer sheet (12, 22), and the waist elastic material 51 fed from an elastic material roll (not shown) is attached to the waist elastic material bonding portion. The abdominal circumference stretchable material 52 is crimped to the abdominal circumference stretchable material bonding portion 52b. 7 shows an example in which the waist elastic material 51 and the waist elastic material 52 are attached to the outer sheet (12, 22) simultaneously by the elastic material guide roller 221. However, the waist elastic material 51 and the waist elastic material 51 The material 52 may be attached to the outer sheet (12, 22) at a different stage by each elastic material guide roller.

  As shown in FIG. 7, a coating material mounting portion 230 is disposed on the downstream side of the elastic material mounting portion 220. In the covering material mounting portion 230, a rotatable turning roller 231 is disposed, and an inner sheet (11, 21) fed out from a roll (not shown) is guided to the turning roller 231 and the outer sheet (12, 22). The various elastic materials 51 and 52 stuck on the top are covered. Further, a smoothing roller 232 that is rotatable so as to face the turning roller 231 is disposed on the non-stretchable surface side of the outer sheets (12, 22). For this reason, the various elastic materials 51 and 52 are stuck between the outer sheets (12, 22) and the inner sheets (11, 21) by pressing by the turning roller 231 and the smoothing roller 232.

As shown in FIG. 7, a stretchable material cutting portion 240 is disposed on the downstream side of the covering material attaching portion 230. The stretchable material cutting portion 240 is composed of a rotatable anvil roller 241 and a cutter roller 242 that are arranged to face each other. The anvil roller 241 has a smooth surface, and the cutter roller 242 has one or a plurality of cutting blade portions 243. The outer sheet (12, 22) and the outer sheet (11, 21) are transported together and the rollers 241 and 242 are rotated simultaneously with the cutting blade 243 of the cutter roller 242 facing the anvil roller 241. , The non-bonded portion of the exterior sheet is synchronized so as to be positioned between the cutting blade portion 243 and the anvil roller 241. As a result, the stretchable material of the non-bonded part is cut by the pressing of the cutting blade part 243 and the anvil roller 241.
More specifically, the cutting blade portion 243 of the cutter roller 242 cuts the waist elastic member 51 at the waist elastic member non-adhesive portion 51a of the exterior sheet and the belly at the belly elastic member non-adhesive portion 52a. The rotation of the anvil roller 241 and the cutter roller 242 is synchronized with the conveying speed of the exterior sheet so that the surrounding stretchable material 52 can be cut.

  Each of the anvil roller 241 and the cutter roller 242 may be heated to a predetermined temperature. For example, the heating temperature of the anvil roller 241 and / or the cutter roller 2423 can be appropriately designed according to the material and number of stretch materials, the material of the exterior sheet, the conveyance speed of the exterior sheet, and the like. It is preferable to set it as 100-150 degreeC. By performing such heating, only the stretchable material in the non-bonded portion can be cut at a higher speed.

  Here, with reference to FIG. 8, the preferable shape and arrangement | positioning of the cutting blade part 243 of the cutter roller 242 are demonstrated. FIG. 8 is a side view conceptually showing the cutter roller 242 of a preferred embodiment, and shows the shape and arrangement of the cutting blade portion 243.

  In the form shown in FIG. 8A, a plurality of fine blades are arranged in a line to form a cutting blade portion 243, and the group of thin blades arranged on a straight line is relative to the rotation axis of the cutter roller 242. Thus, they are inclined at a predetermined angle θ. The number of fine blades forming each cutting blade portion can be changed as appropriate, and can be appropriately increased or decreased according to the required length required for each cutting blade portion. Further, in FIG. 8A, the symbol R and the alternate long and short dash line indicate the rotation axis of the cutter roller 242. As shown in FIG. 8A, each cutting blade portion (thin blade group) is a smooth surface of the cutter roller 242 so as to be inclined by a predetermined angle θ with respect to the rotation axis R of the cutter roller 242. It is provided above. For example, the angle θ is preferably 5 to 40 degrees, 10 to 30 degrees, or 15 to 20 degrees. Thus, by forming the cutting blade portion 24 with a plurality of thin blades, it is possible to prevent the various stretchable materials from being cut. Further, by inclining the cutting blade portion 24 composed of a group of thin blades arranged in a row with respect to the rotation axis of the cutter roller 242 by a predetermined angle, each elastic material can be obtained without lowering the linear pressure of each cutting blade portion. Can be cut.

  FIG. 8B shows another example of the shape and arrangement of the cutting blade portion 243. As shown in FIG. 8B, the cutting blade part 243 includes a first cutting blade part 243a, a second cutting blade part 243b, a third cutting blade part 243c, and a fourth cutting blade part 243d. Have. The first cutting blade portion 243a cuts the waist elastic member 51 on the front body side. The second cutting blade portion 243b cuts the waist elastic member 51 on the back body side. The 3rd cutting blade part 243c and the belly circumference elastic material 52 of the front body side are cut | disconnected. The 4th cutting blade part 243d cut | disconnects the belly circumference elastic material 52 by the back body side. Thus, the respective cutting blade portions are arranged differently according to the stretchable material to be cut. Further, as shown in FIG. 8, each cutting blade portion is formed by arranging a plurality of thin blades side by side. The number of fine blades forming each cutting blade portion can be changed as appropriate, and can be appropriately increased or decreased according to the required length required for each cutting blade portion. Further, in FIG. 8B, the symbol R and the alternate long and short dash line indicate the rotation axis of the cutter roller 242. As shown in FIG. 8B, each cutting blade portion (thin blade group) is a smooth surface of the cutter roller 242 so as to be inclined by a predetermined angle θ with respect to the rotation axis R of the cutter roller 242. It is provided above. For example, the angle θ is preferably 5 to 40 degrees, 10 to 30 degrees, or 15 to 20 degrees. Furthermore, each cutting blade part is provided in the arrangement | positioning which does not overlap with any other cutting blade part in the rotating shaft direction (left-right direction in the figure) of the cutter roller 242. That is, the dotted line in FIG. 8B is an auxiliary line for explanation, but as the auxiliary line indicates, any other cutting blade part is present in the left-right direction (rotational axis direction) of a certain cutting blade part. Is not located.

  In this way, by disposing each cutting blade portion of the cutter roller 242 at a predetermined angle with respect to the rotation axis of the cutter roller, each elastic material can be cut without reducing the linear pressure of each cutting blade portion. Is possible. Further, a first cutting blade portion 243a, a second cutting blade portion 243b, a third cutting blade portion 243c, and a fourth cutting blade portion 243d are formed, and the position of each cutting blade portion is determined by the cutter. By not overlapping any of the other cutting blades in the direction of the rotation axis of the roller, the elastic material is not cut at two or more points at the same time. That is, if the elastic material is cut at two or more points at the same time, the linear pressure of the cutting blade may decrease, and the elastic material may not be cut. However, the cutting blade is always cut so that the elastic material can be cut at one point. By designing the arrangement, it is possible to prevent the line pressure from decreasing and cut the elastic material efficiently without interruption.

  Further, FIG. 2 shows a development view of a disposable diaper in which each elastic material is cut by the cutter roller 242 of the form shown in FIG. As shown in FIG. 2, reference numeral C1 indicates a cutting trace by the first cutting blade 243a, reference C2 indicates a cutting trace by the second cutting blade 243b, and reference C3 indicates a third cutting edge. The cutting trace by the blade part 243c is shown, and the code | symbol C4 has shown the cutting trace by the 4th cutting blade part 243d. In this way, when simultaneously cutting the corresponding elastic material by each cutting blade portion, by adopting the cutter roller 242 of the form shown in FIG. 8B, each elastic material is unbreakable at high speed. It can cut without.

The exterior sheet from which the elastic material has been cut as described above is cut and molded by a known cutting means in an exterior sheet cutting portion (not shown), which is a process following the cutting of the elastic material, and the front body exterior body of each leaf 10 and the back body exterior body 20. For example, the exterior sheet is cut by the exterior sheet cutting portion with every other non-adhesive portion. After that, the absorbent main body 30 manufactured in a separate process by a known means is fixed to the skin contact surface side of the front body exterior body 10 and the back body exterior body 20 of each leaf. Thereby, what is called a bridge type disposable diaper is manufactured.
However, the manufacturing apparatus and the manufacturing method of the disposable diaper of the present invention are not limited to those for manufacturing a cross-linked disposable diaper. Other than that, a pants-type disposable diaper or a tape-type disposable diaper is adopted by using a normal method. Can also be manufactured.

(2-2. Second Embodiment of Manufacturing Method and Manufacturing Apparatus)
Next, a second embodiment of the manufacturing method and the manufacturing apparatus of the disposable diaper according to the present invention will be described.
FIG. 9 is a schematic perspective view showing a manufacturing apparatus according to the second embodiment. In short, FIG. 9 shows an example in which the waist elastic member 51 and the belly elastic member 52 are cut in different processes by different cutting devices. For example, in order to manufacture the disposable diaper having the form shown in FIGS. 4 and 5, it is necessary to cut the waist elastic material 51 and the belly elastic material 52 at different stages. For example, taking the disposable diaper shown in FIG. 4 as an example, the belly stretchable material 52 needs to be cut when the inner sheet 11 is placed on the belly stretchable material 52. On the other hand, the waist elastic member 51 has the inner sheet 11 disposed on the waist elastic member 52, the absorbent main body 30 disposed on the inner sheet 11, and the outer sheet 12 folded back at the waist opening edge. , Need to cut. As described above, the waist elastic member 51 and the belly elastic member 52 may be cut at different stages by different cutting devices. Hereinafter, an example of a manufacturing method and a manufacturing apparatus for cutting the waist elastic material 51 and the waist elastic material 52 separately will be described.

  As shown in FIG. 9, on the upstream side of the manufacturing apparatus 200, a plurality of waist elastic members 51 and a plurality of belly elastic members 52 are arranged at appropriate positions on the outer sheets (12, 22). The plurality of waist elastic members 51 and the plurality of belly elastic members 52 are fixed on the outer sheet (12, 22) such that the bonded portions and the non-bonded portions are alternately continued. Next, the inner sheets (11, 21) are disposed only on the belly stretchable material 52. Thereby, the belly stretchable material 52 is sandwiched and fixed between the outer sheets (12, 22) and the inner sheets (11, 21).

  Subsequently, after the inner sheets (11, 21) are arranged, the sheets including the outer sheets (12, 22), the inner sheets (11, 21), the waist elastic material 51, and the waist elastic material 52 are It is introduced into the elastic material cutting part 240a. The first stretchable material cutting portion 240a includes a first anvil roller 241a and a first cutter roller 242a. And the 1st cutter roller 242a has the abdominal circumference elastic material cutting blade part 243e which cuts the abdominal circumference elastic material 52 in a non-bonding part. As described above, the waist elastic member 52 is cut at the non-bonded portion by the belly elastic member cutting blade 243e. Thereby, as shown in FIG. 9, an abdominal circumference elastic material discontinuous region 62 is formed.

  Next, the absorptive main body 30 is arrange | positioned by the well-known apparatus (illustration omitted) in the belly circumference elastic material discontinuous area | region 62. FIG. Thereafter, the outer sheet (12, 22) is folded back to the skin contact surface side at a position corresponding to the edge of the waist opening by a known folding device 245. Thereby, the waist elastic material 51 is clamped by the folding | returning part of an outer sheet | seat (12, 22).

  On the downstream side of the folding device 245, the second stretchable material cutting portion 240b is located. The second elastic material cutting portion 240b includes a second anvil roller 241b and a second cutter roller 242b. And the 2nd cutter roller 242b has the waist elastic | stretch material cutting blade part 243f which cut | disconnects the waist elastic material 51 in a non-bonding part. For this reason, the sheet including the outer sheets (12, 22), the inner sheets (11, 21), the waist elastic member 51, and the belly elastic member 52 is formed by the second anvil roller 241b and the second cutter roller 242b. When introduced in between, only the waist elastic member 51 sandwiched between the folded portions of the outer sheets (12, 22) is cut at the non-bonded portion. As a result, as shown in FIG. 9, a waist stretchable material discontinuous region 61 is formed.

As described above, when it is difficult to cut the waist elastic material 51 and the waist elastic material 52 in the same process and the same apparatus, the waist elastic material 51 and the waist elastic material 52 are separated at different stages by different cutting devices. It is also possible to cut.
9 shows an example in which the outer sheets (12, 22) are integrated, the outer sheet (12, 22) is divided into two parts, a front body exterior body and a rear body exterior body. It is also possible to produce cross-linked disposable diapers. For example, in the case of manufacturing a cross-linked disposable diaper, before the absorbent main body 30 is placed and fixed on the inner sheet (11, 21), the outer sheet (12, 22) is attached to the front body exterior body and the rear body. It suffices that the absorbent main body 30 is placed and fixed so as to be laid on the front body exterior body and the rear body exterior body after being divided into those forming the body exterior body.

(2-3. Third Embodiment of Manufacturing Method and Manufacturing Apparatus)
Next, a third embodiment of the manufacturing method and the manufacturing apparatus of the disposable diaper according to the present invention will be described. In short, the third embodiment adopts the cutter roller 242 and the ultrasonic vibration device 244 as the stretchable material cutting portion. In the above-described embodiment, the description has been given of the case where the cutter roller 242 and the anvil roller 241 are used as the elastic material cutting part. However, in the third implementation failure, the ultrasonic vibration device 244 is used instead of the anvil roller 241. This is different from the above embodiment.
Hereinafter, an explanation will be made focusing on the stretchable material cutting portion provided with the cutter roller 242 and the ultrasonic vibration device 244.

FIG. 10 shows the structure of the ultrasonic vibration device 244 and the cutter roller 242 extracted from the configuration of the disposable diaper manufacturing apparatus. The outer sheet (12, 22) and the inner sheet (11, 21). A state in which the sheet S holding the waist elastic member 51 and the belly elastic member 52 passes between the ultrasonic vibration device 244 and the cutter roller 242 is shown in perspective.
As shown in FIG. 2, the sheet S is fed between the ultrasonic vibration device 244 and the cutter roller 242. The cutter roller 242 has a cutting blade portion 243 protruding on the surface of the peripheral side surface, and rotates while pressing the sheet S between the ultrasonic vibration device 244 and the cutting blade portion 243 of the cutter roller 242. In this way, when the ultrasonic vibration device 244 and the cutter roller 242 sandwich the sheet S from each surface, the ultrasonic vibration energy generated from the ultrasonic vibration device 244 becomes the contact point between the sheet S and the cutter roller 242. Is transmitted to. When the ultrasonic vibration energy is transmitted, frictional heat due to the ultrasonic vibration is greatly generated at the point where the cutter roller 242 and the sheet S are in contact with each other. The waist elastic material 51 and the belly elastic material 52 included in the sheet S start to melt due to the frictional heat, and finally the waist elastic material sandwiched between the ultrasonic vibration device 244 and the cutter roller 242. 51 and the belly circumference elastic material 52 are melted.

  The ultrasonic vibration device 244 can generate frictional heat on the sheet sandwiched between the ultrasonic vibration device 244 and the cutter roller 242 by vibrating with a fine vibration width. The ultrasonic vibration device 244 may be one that vibrates perpendicularly to the surface of the sheet to be introduced and generates frictional heat by continuously striking the sheet. Further, the ultrasonic vibration device 244 may be a device that slightly vibrates in parallel with the surface of the sheet to be introduced and generates frictional heat by sliding on the surface of the sheet. For example, the ultrasonic vibration device 244 generates ultrasonic waves of 15 kHz to 40 kHz, or 20 kHz to 30 kHz. For this reason, the ultrasonic vibration device 244 vibrates with a fine width of, for example, 10 μm to 100 μm in a direction perpendicular to or parallel to the sheet surface.

  As shown in FIG. 2, the ultrasonic vibration device 244 includes a horn 2441 that is in contact with a friction target sheet, a booster 2442 connected to the horn 2441, and a converter 2443 connected to the booster 2442. Converter 2443 converts the high frequency electrical signal into mechanical vibration and conducts it to booster 2442. The booster 2442 increases or decreases the vibration generated by the converter 2443 to vibrate the horn 2441. The horn 2441 vibrates in resonance with the ultrasonic vibrations of the converter 2443 and the booster 2442, and applies vibration energy to the friction target sheet. In addition, the horn 2441 is preferably circular, elliptical, or spherical with a contact point or contact line in contact with the frictional object as a vertex in order to collect and apply the frictional energy to the frictional object. Further, the horn 2441 may be formed in a simple shape such as a rectangular parallelepiped or a cubic body so as to resonate with ultrasonic vibrations, and the crimping surface for crimping the friction object is formed as a flat surface. It is good to be.

  The cutter roller 242 is a drum-like device that rotates in a direction in which the sheet can be conveyed toward the downstream side. The cutter roller 242 sandwiches the sheet in cooperation with the ultrasonic vibration device 244 and friction by rubbing with the ultrasonic vibration device 244. The sheet is blown using heat. A protruding cutting blade 243 is formed on the surface of the peripheral side surface of the cutter roller 242. That is, to be precise, the sheet passes between the horn 11 of the ultrasonic vibration device 244 and the cutting blade portion 243 of the cutter roller 242 in a pressed state. The cutter roller 242 is preferably formed of a hard material whose shape is not deformed even by frictional heat generated by the ultrasonic vibration device 244. The material of the cutter roller 242 is preferably a hard and sticky material with small thermal expansion. For example, the cutter roller 242 can be made of metal such as stainless steel, copper, or die steel. The cutting blade portion 243 formed on the cutter roller 242 may be formed with a convex shape by winding a metal plate around the surface of the peripheral side surface of the cutter roller 242. Further, the cutting blade portion 243 may be engraved on the surface of the cutter roller 242 to form a convex shape.

  Further, a spacer (not shown) for maintaining a fine gap between the horn 11 of the ultrasonic vibration device 244 and the cutting blade portion 243 of the cutter roller 242 may be provided. This spacer is provided, for example, between the horn 11 and the cutter roller 242 main body, or between the ultrasonic vibration device 244 main body and the cutter roller 242 main body. By providing the spacer, it is possible to always keep the fine gap width between the ultrasonic vibration device 244 and the cutting blade 243 constant even when the ultrasonic vibration device 244 vibrates.

  As described above, in the third embodiment of the manufacturing method and the manufacturing apparatus of the disposable diaper according to the invention, the sheet S is placed between the cutter roller 242 provided with the cutting blade portion and the ultrasonic vibration device 244 that vibrates finely. Since each of the elastic members can be melted and melted by using the frictional heat generated by rubbing the ultrasonic vibration device and the sheet S, the elastic material 51 around the waist and the elastic material 52 around the abdomen can be fused. Can be prevented, and the deterioration of the cutting blade portion can be suppressed.

The manufacturing method and manufacturing apparatus of the so-called cross-linked disposable diaper have been described above. However, the manufacturing method and manufacturing apparatus of the present invention are also adopted as a manufacturing method and manufacturing apparatus of other pants-type disposable diapers and tape-type disposable diapers. can do.
Moreover, in this specification, in order to express the content of this invention, embodiment of invention was described, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

  The present invention can be applied to diapers for infants and the elderly, a manufacturing method thereof, and a manufacturing apparatus. Therefore, the present invention can be suitably used in industries related to childcare and nursing care.

DESCRIPTION OF SYMBOLS 1 Waist circumference part 2 Abdominal circumference part 3 Crotch part 4 Waist circumference opening part 5 Leg circumference opening part 10 Front body exterior body 11 Inner sheet 12 Outer sheet 12a Folding part 13 Cushion formation sheet 20 Rear body exterior body 21 Inner sheet 22 Outer body Seat 23 Cushion forming sheet 22a Folding part
30 Absorbent body 31 Absorber 32 Top sheet 33 Back sheet 34 Three-dimensional gather 35 Cover sheet 40 Disposable tape 51 Waist elastic material 51a Waist elastic material non-adhesive part 51b Waist elastic material adhesive part 52 Abdominal elastic material 52a Belly Around elastic material non-adhesive part 52b Abdominal elastic material adhesive part 53 Three-dimensional gather elastic material 61 Waist elastic material discontinuous area 62 Abdominal elastic material discontinuous area 71 Joining part 72 Non-joining part 100 Disposable diaper 200 Manufacturing apparatus 210 Adhesive Application unit 220 Stretch material attachment portion 221 Stretch material guide roller 230 Cover material attachment portion 231 Turning roller 232 Smoothing roller 240 Stretch material cutting portion 241 Anvil roller 242 Cutter roller 243 Cutting blade portion 243a First cutting blade portion 243b Second cutting Blade portion 243c Third cutting blade portion 243d Fourth cutting blade portion 24 4 Ultrasonic vibration device 2441 Horn 2442 Booster 2443 Converter 245 Folding device

Claims (8)

The waist circumference part (1) near the edge forming the waist circumference opening, the crotch part (3) located in the crotch of the wearer, and the abdomen circumference part (between the waist circumference part and the crotch part) 2) a disposable diaper having
The waist portion (1) is provided with a plurality of waist stretchable members (51) in a direction along an edge of the waist opening,
The abdominal circumference part (2) is provided with a plurality of abdominal circumference elastic members (52) along the width direction of the disposable diaper,
Having an absorbent main body (30) extending in the longitudinal direction of the disposable diaper around the abdomen (2) and the crotch (3);
At least some of the plurality of waist elastic members (51) are discontinuously provided in the widthwise center of either or either of the front body side and the back body side of the disposable diaper,
The disposable diapers, wherein the plurality of belly stretchable members (52) are discontinuously provided at a central portion of the absorbent main body (30).
The waist elastic material discontinuous region (61) in which the waist elastic material (51) is discontinuous is the waist elastic material discontinuous region (61) in which the belly elastic material (52) is discontinuous ( The disposable diaper according to claim 1, wherein a length in the width direction of the disposable diaper is shorter than 62).
The disposable diaper further includes a disposal tape (40) for holding the disposable diaper in a rolled state when the disposable diaper is discarded,
The disposal tape (40) is arranged such that all or part of the disposal tape is located in the waist elastic material discontinuous region (61) provided in either the front body or the back body. The disposable diaper according to claim 1 or 2, wherein the disposable diaper is attached.
The waist circumference part (1) near the edge forming the waist circumference opening, the crotch part (3) located in the crotch of the wearer, and the abdomen circumference part (between the waist circumference part and the crotch part) 2)
A plurality of waist elastic members (51) are provided on the outer sheet along the edge of the waist opening at the waist (1),
The abdominal circumference part (2) is provided with a plurality of abdominal circumference elastic members (52) on the outer sheet along the width direction of the disposable diaper,
A manufacturing apparatus for manufacturing a disposable diaper having an absorbent main body (30) extending in the longitudinal direction of the disposable diaper around the abdomen (2) and the crotch part (3),
In the waist part (1) of the disposable diaper, a non-adhesive part (51a) is positioned at the width direction central part of the front body side or the back body side of the disposable diaper, and the width direction of the non-adhesive part (51a) A waist elastic material attaching portion for attaching the plurality of waist elastic materials (51) in an extended state such that the adhesive portions (51b) are located on both left and right sides;
A non-adhesive part (52a) is located at the center part in the width direction on the front body side or the back body side of the disposable diaper in the abdominal part (2) of the disposable diaper, and the width direction of the non-adhesive part (52a) An abdominal circumference stretchable material attaching portion for attaching the plurality of abdominal circumference stretchable materials (52) in an extended state so that the adhesive portions (52b) are located on both left and right side portions;
While cutting the waist elastic material (51) at the non-bonded portion (51a) of the waist elastic material (51), the waist elastic material at the non-bonded portion (52a) of the waist elastic material (52). The manufacturing apparatus of a disposable diaper which comprises the elastic | stretch material cutting part which cut | disconnects (52) and makes the said waist elastic | stretch material (51) and the said belly elastic material (52) discontinuous.
The stretchable material cutting part is
An anvil roller (241) having a smooth surface and a cutter roller (242) having a cutting blade (243) are provided at positions facing each other,
Between the anvil roller (241) and the cutter roller (242), the extending direction of the waist elastic material (51) and the belly elastic material (52) is the anvil roller (241) and the cutter. The outer sheet is introduced so as to be orthogonal to the rotation axis of the roller (242),
The disposable body according to claim 4, wherein the waist elastic member (51) and the belly elastic member (52) on the outer sheet are pressure-cut by the cutting blade portion (243) of the cutter roller (242). Diaper manufacturing equipment.
An ultrasonic vibration device (244) and a cutter roller (242);
The ultrasonic vibration device (244) is disposed on the one surface side of the outer sheet and generates frictional heat with respect to the one surface of the outer sheet by fine vibration.
The cutter roller (242) is disposed rotatably on the other surface side of the outer sheet so as to face the ultrasonic vibration device (244), and has a cutting blade on the surface facing the ultrasonic vibration device (244). Part (243),
By passing the waist elastic member (51) and the belly elastic member (52) on the outer sheet in a pressure contact state between the ultrasonic vibration device (244) and the cutting blade part (243). The manufacturing apparatus of the disposable diaper of Claim 4. Fusing by the said frictional heat.
The cutter roller (241) has a plurality of cutting blade portions (243) provided at a predetermined angle with respect to the rotation axis of the cutter roller (242),
The plurality of cutting blade portions (243)
A first cutting blade (243a) for cutting the waist elastic material (51) on the front body side of the disposable diaper;
A second cutting blade (243b) for cutting the waist elastic material (51) on the back body side of the disposable diaper;
A third cutting blade portion (243c) for cutting the elastic material (52) around the abdomen on the front body side of the disposable diaper;
A fourth cutting blade portion (243d) for cutting the elastic material (52) around the abdomen on the back body side of the disposable diaper;
The first cutting blade portion (243a), the second cutting blade portion (243b), the third cutting blade portion (243c), and the fourth cutting blade portion (243d) are formed on the cutter roller ( The manufacturing apparatus of the disposable diaper according to claim 5 or 6, provided in a position that does not overlap any of the other cutting blade portions in the rotation axis direction of 242).
The waist circumference part (1) near the edge forming the waist circumference opening, the crotch part (3) located in the crotch of the wearer, and the abdomen circumference part (between the waist circumference part and the crotch part) 2)
A plurality of waist elastic members (51) are provided on the outer sheet along the edge of the waist opening at the waist (1),
The abdominal circumference part (2) is provided with a plurality of abdominal circumference elastic members (52) on the outer sheet along the width direction of the disposable diaper,
A manufacturing method for manufacturing a disposable diaper having an absorbent main body (30) extending in the longitudinal direction of the disposable diaper around the abdomen (2) and the crotch part (3),
In the waist part (1) of the disposable diaper, a non-adhesive part (51a) is positioned at the width direction central part of the front body side or the back body side of the disposable diaper, and the width direction of the non-adhesive part (51a) A waist elastic material attaching step for attaching the plurality of waist elastic materials (51) in an extended state so that the adhesive portions (51b) are located on both left and right sides;
A non-adhesive part (52a) is located at the center part in the width direction on the front body side or the back body side of the disposable diaper in the abdominal part (2) of the disposable diaper, and the width direction of the non-adhesive part (52a) An abdominal circumference stretchable material attaching step for attaching the plurality of abdominal circumference stretchable materials (52) in an extended state so that the adhesive portions (52b) are located on both left and right side portions;
While cutting the waist elastic material (51) at the non-bonded portion (51a) of the waist elastic material (51), the waist elastic material at the non-bonded portion (52a) of the waist elastic material (52). The manufacturing method of a disposable diaper including the elastic material cutting process which cut | disconnects (52) and makes the said waist elastic | stretch material (51) and the said belly elastic material (52) discontinuous.

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