JP5360327B1 - Pants-type disposable diaper and method for manufacturing the same - Google Patents

Abstract

[PROBLEMS] To provide a pants-type disposable diaper having good appearance of side seal portions formed on both right and left side portions of a diaper and having a good touch at the side seal portions.
A pants-type disposable diaper in which a pair of side seal portions 4 is formed. The pair of side seal portions 4 includes a main joint region 40 extending in the vertical direction and an outer side in the left-right direction than the main joint region 40. And a sub-joining region 50 extending in the vertical direction. Here, the sub-joining region 50 is a region formed by providing one or a plurality of emboss rows in which a plurality of sub-embossed portions 51 are arranged at intervals in the vertical direction. Is set to be weaker than the bonding strength of the main bonding region 40.
[Selection] Figure 3

Description

  The present invention relates to a disposable diaper that is attached to a crotch of a wearer and absorbs and holds a liquid such as urine, and a method for manufacturing the disposable diaper. More specifically, the present invention relates to a disposable diaper molded into a pants shape by joining the left and right sides of a front body and a back body at a side seal portion, and a method for manufacturing the disposable diaper.

  2. Description of the Related Art Conventionally, a pants-type disposable diaper that is worn by, for example, infants and the elderly is known. A general pants-type disposable diaper includes an absorbent main body having a liquid absorption function, and a cover sheet for holding the absorbent main body in the crotch of the wearer. In the cover sheet, the left and right ends of the front body and the back body are joined in advance, whereby a disposable diaper is molded into a pants shape. For this reason, the wearer can put on the pants-type disposable diaper by inserting both legs from the opening around the waist. Moreover, in the side seal part, since both ends of the front body and the back body are joined with appropriate joint strength, the wearer can easily take off the pants-type disposable diaper by breaking the side seal part. Can do.

  Such a side seal part is generally formed by heat-sealing thermoplastic sheet members constituting a diaper cover sheet by heat sealing or ultrasonic sealing. For example, heat sealing is a method of introducing a plurality of laminated thermoplastic sheets between a pair of rolls consisting of an embossing roll having a block engraved with a bonding pattern on one side and a flat anvil roll. In this technique, a thermoplastic sheet is heated and pressed by a roll to melt and join the sheet. Ultrasonic sealing is a method of introducing ultrasonic vibrations while pressing the sheets by introducing a plurality of laminated thermoplastic sheets between a block engraved with a bonding pattern and an ultrasonic horn that transmits ultrasonic vibrations. This is a technique for joining by melting the sheet with frictional heat.

  As described above, for example, Patent Literature 1 and Patent Literature 2 disclose a technique for forming a pair of side seal portions on the left and right side portions of a disposable diaper by heat sealing or ultrasonic sealing.

JP-T-2004-523374 JP 2002-102283 A

  However, the cover sheets constituting the front body and the back body of the disposable diaper are bound only at the joint portion extending in the vertical direction, and are not bound at portions other than the joint portion. That is, the front body cover sheet and the back body cover sheet are not bound to each other on the outer side in the left and right direction with respect to the joint portion. There was a problem that the sheet opened and fluttered and the appearance was not good.

  By the way, there are many diaper cover sheets to which an elastic stretch member for imparting stretchability is fixed. For example, the elastic stretchable member is sandwiched between layers of a plurality of sheet members at the waist and abdomen portions of the front and back bodies, and is fixed with a hot melt adhesive or the like. As a method for applying the hot melt adhesive, for example, there are a case where the hot melt adhesive is applied onto the surface of the sheet member constituting the cover sheet and a case where the hot melt adhesive is directly applied to the elastic elastic member. In addition, in addition to fixing the elastic elastic member, a hot melt adhesive may be applied to the cover sheet in order to bond the front body and the back body cover sheets together. Here, as described above, when the side seal portions are formed on the left and right side portions of the disposable diaper, a joining technique such as heat sealing or ultrasonic sealing is used. These heat seals and ultrasonic seals join thermoplastic sheets together by heat fusion. However, if a hot melt adhesive is present in the joining portion of this thermoplastic sheet, heat is used to dissolve the hot melt adhesive, and the thermoplastic sheet to be joined can be sufficiently heated. It becomes impossible to bond, the bonding strength is not stable, the melted hot melt adhesive develops stickiness in the bonded part, and the embossed pattern of the bonded part is solidified and hardened, causing problems To do. For this reason, regarding the joining at the side seal portion, it is considered preferable not to apply the hot melt adhesive to the joining portion. Therefore, in the disposable diaper, it is preferable not to apply the hot-melt adhesive and not fix the elastic stretchable member to the site where the side seal portion is to be formed. For example, the hot melt adhesive or the elastic elastic member is fixed at least in the side seal part by intermittently applying a hot melt adhesive for fixing the elastic elastic member except for the part forming the side seal part. Can be in a state that does not exist. However, intermittent application of hot melt adhesive creates areas where hot melt adhesive does not exist on the left and right sides (side seal portions) of the disposable diaper. Is a region where the front body and the back body are not bound to each other in the region on the outer side in the left-right direction from the joint (main joint region) for the purpose of binding the cover sheet of the front body and the cover sheet of the back body (Non-binding site) exists. Then, the left and right side ends of the disposable diaper have a problem that the front body cover sheet and the back body cover sheet open in a fluttering manner at the non-binding portion, and the appearance is not good.

  On the other hand, in order to prevent the front body, the cover sheet, and the back body cover sheet from opening on the left and right sides as described above, the joint portions thereof are formed at positions close to the left and right edges of the diaper. Is also possible. However, a pants-type diaper obtains individual pants-type diapers by laminating a plurality of continuous sheet materials as described later, joining them with a pair of two joints, and cutting between them. Therefore, if there is not too much space between the joints, there is a possibility that the joints may not be cut at the time of cutting, and the joints may be cut. If it does so, the dispersion | variation in the joint strength of a junction part will become large. Moreover, since the cross section of many joining parts is exposed to a cut part, it will also be inferior to the touch. For this reason, conventionally, it is not preferable to form a joint (main joint region) for the purpose of binding the cover sheet of the front body and the cover sheet of the back body at positions close to the left and right edges of the diaper. It was said.

  As described above, with the conventional technology, it has been difficult to improve both the appearance of the side seal part of the pants-type disposable diaper and the touch of the side seal part. For this reason, at present, it is a technology related to the side seal part of the pants-type disposable diaper, and on the left and right side parts of the diaper, the front body cover sheet and the back body cover sheet are prevented from opening and deteriorating in appearance. There is a need for a technique for preventing the touch of the left and right sides of a diaper from being damaged.

Therefore, as a result of intensive studies on the means for solving the problems of the conventional invention, the inventor of the present invention binds the right and left side parts of the front body and the back body of the disposable diaper in the main joining region, and A pants-type disposable diaper is formed on the outer side in the left-right direction with respect to the joining area by forming a sub-joining area with a weaker joining strength than the main joining area to prevent the front cover sheet and the back cover sheet from opening. It has been found that the appearance of the can be improved and that the touch on the left and right sides can be prevented from being damaged. Then, the inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and completed the present invention.
Specifically, the present invention has the following configuration.

A first aspect of the present invention relates to a pants-type disposable diaper.
The pants-type disposable diaper of the present invention is divided into a front body 1 that contacts the abdomen of the wearer, a back body 2 that contacts the back of the wearer, and a crotch 3 positioned between the front body 1 and the back body 2. Is done. The pants-type disposable diaper is a pair of sides that are heat-sealed and bonded by heat sealing or ultrasonic sealing in a state where the left and right side portions of the front body 1 and the left and right side portions of the back body 2 are overlapped with each other. A seal portion 4 is formed.
Here, the pair of side seal portions 4 includes a main joint region 40 extending in the up-down direction and a sub-joint region 50 positioned on the outer side in the left-right direction than the main joint region 40 and extending in the up-down direction.
The sub-joining region 50 is a region formed by providing one or a plurality of embossed rows in which a plurality of sub-embossed portions 51 are arranged at intervals in the vertical direction.

  As in the above configuration, the pants-type disposable diaper of the present invention has a front body and a rear part on the outer side of the main joint region 40 for the purpose of binding the left and right sides of the front body and the back body. A sub-joining region 50 is formed for the purpose of preventing the body from being released. Thus, by providing the sub-joining area | region 50, the problem that the cover sheet of a front body and the cover sheet of a back body open and it looks bad in the right and left both sides of a diaper can be solved. Further, the bonding strength of the sub-joining region 50 is weaker than that of the main joining region 40. In other words, the sub-joining region 50 is not intended to bind both the front and rear body parts of the diaper, but it is sufficient if the cover sheet can be prevented from being released on both side parts of the diaper. The bonding strength can be made much weaker than the bonding strength of the main bonding region 40. Thereby, even if the subjoining area | region 50 is provided, the touch of a diaper is hardly impaired, As a result, the wearing feeling of a diaper can be improved.

  In the present invention, the bonding strength of the sub bonding region 50 is preferably 50% or less with respect to the bonding strength of the main bonding region 40.

  Like the said structure, the touch strength of the subjoining area | region 50 whole can be maintained to a soft thing by making the joining strength in the subjoining area | region 50 into the half or less of the joining strength in the main joining area | region 40. FIG. Moreover, when the wearer takes off the disposable diaper by setting the joining strength in the sub-joining region 50, it is possible to prevent the right and left side parts of the diaper joined by the third seal part 4 from being easily broken.

  In the pants-type disposable diaper of the present invention, no adhesive is applied to the main joint region 40 and the sub-joint region 50, and the front body 1 and the back body 2 are obtained only by heat sealing using heat sealing or ultrasonic sealing. It is preferable that the right and left both sides are joined. For example, in the main joint region 40 and the sub-joint region 50, the sheet members constituting the left and right sides of the front body 1 and the back body 2 are not joined by an adhesive, and the front body 1 and the back body 2 It is preferable that the elastic elastic member is not attached to the sheet member constituting the left and right side portions with an adhesive.

  As described above, when an adhesive such as a hot melt adhesive is present at the site where the main joining region 40 and the sub joining region 50 are to be formed, the main joining is performed by a heat sealing technique using heat sealing or ultrasonic sealing. Even if it is going to form the area | region 40 and the subjoining area | region 50, the heat | fever produced by the heat seal or the ultrasonic seal will be used in order to melt | dissolve a hot-melt-adhesive. As a result, the thermoplastic sheet to be bonded cannot be sufficiently heated and the bonding strength is not stable, or the melted hot-melt adhesive exhibits stickiness in the bonded portion, or the embossed pattern of the bonded portion is The trouble that it hardens and hardens in the disordered state occurs. For this reason, it can be said that it is preferable not to apply a hot-melt adhesive to the joining portion in terms of joining at the side seal portion. However, if the hot-melt adhesive is not applied to the side seal part, there is a problem that the front cover sheet and the back cover sheet open and flicker in the left and right sides of the diaper. Therefore, in a preferred embodiment of the present invention, in order to solve these problems at the same time, the hot melt adhesive is not applied to the part where the side seal portion is to be formed, and this hot melt adhesive is applied. By forming not only the main joining region 40 but also the sub joining region 50 in the part that is not, and preventing the cover sheet of the front body and the cover sheet of the back body from opening, the both sides of the disposable diaper look good, And it is supposed to join with good stability.

  In the pants-type disposable diaper of the present invention, at least two or more of the plurality of sub-embossed portions 51 formed in the sub-joint region 50 reach the left and right edges 4a of the front body 1 and the back body 2. Is preferred.

  As in the above configuration, the plurality of sub-embossed portions 51 reach the left and right side edges 4a of the front body 1 and the back body 2, so that the front body cover sheet and the back body cover sheet can be more reliably provided. Can be prevented from opening.

  In the pants-type disposable diaper of the present invention, the main joining region 40 is preferably a region formed by providing a plurality of embossed rows in which a plurality of main embossed portions 41 are arranged at intervals in the vertical direction. Similarly, the sub-joining region 50 is preferably a region formed by providing a plurality of embossed rows in which a plurality of sub-embossed portions 51 are arranged at intervals in the vertical direction. In this case, the bonding strength of the sub bonding region 50 is preferably 30% or less with respect to the bonding strength of the main bonding region 40.

Like the said structure, both the main joining area | region 40 and the subjoining area | region 50 are formed of the some emboss row | line | column provided in the left-right direction at intervals, and the joining strength in the subjoining area | region 50 is By being significantly weaker than the bonding strength in the main bonding region 40, it is possible to effectively prevent the front body cover sheet and the back body cover sheet from being opened and the touch of the diaper from being impaired.
Moreover, the main joining area | region 40 is a junction part for giving joint strength required at the time of wearing to both side parts, and the subjoining area | region 50 is a junction part for stopping so that the left-right direction outer side of the main joining area | region 40 may not open. is there. Accordingly, it is preferable that the bonding strength between the main bonding region 40 and the sub-bonding region 50 has such a large difference as described above. That is, when there is no significant difference in bonding strength between the main bonding region 40 and the sub bonding region 50, a large force is required to break the side seal portion 4. Then, in addition to being stressed by the user, the wearer will be shaken with a broken force, and the wearer will also feel uncomfortable.

Moreover, in the underpants type disposable diaper of this invention, it is preferable that the main junction area | region 40 is provided over the full length of the up-down direction in the right-and-left both sides part of an underpants type disposable diaper. On the other hand, the vertical length of the sub-joining region 50 is preferably shorter than the vertical length of the main joining region 40. Furthermore, it is preferable that the sub-joining area | region 50 is offset and arrange | positioned in the position which does not correspond with the edge part of the up-down direction of a diaper. Note that the length in the vertical direction in this case refers to the interval between the outer edges of the emboss pattern located at the outermost part.
If it is the position of such a subjoining area | region 50, since a junction part is not exposed to the upper end and lower end of a diaper, it can avoid giving a wearer a discomfort by a hard junction part touching skin. On the other hand, since it is necessary to give the main joining area | region 40 the intensity | strength which the circumference | surroundings and leg circumference | surroundings during wearing and the circumference | surroundings of a leg are not torn, it is better to be provided over the full length of the diaper.

The 2nd side surface of this invention is related with the manufacturing method of a pants-type disposable diaper. The pants-type disposable diaper has a front body 1 that contacts the wearer's abdomen, a back body 2 that contacts the back of the wearer, and a crotch part 3 positioned between the front body 1 and the back body 2.
In the production method of the present invention,
Obtaining a diaper continuum in which a plurality of disposable diapers are arranged in the left-right direction;
Folding the diaper continuum at the crotch 3 and superimposing the front body 1 and the back body 2;
A joining step of forming side seal portions 4 for heat-sealing and joining the left and right sides of the front body 1 and the left and right sides of the back body 2 by heat sealing or ultrasonic sealing;
Cutting the diaper continuous body in a vertical direction at positions corresponding to the left and right edges 4a of the front body 1 and the back body 2 to obtain individual pants-type disposable diapers.
Here, the side seal portion 4 formed in the joining step has a main joining region 40 extending in the up-down direction and a sub-joining region 50 positioned on the outer side in the left-right direction and extending in the up-down direction from the main joining region 40. ing.
Further, the sub-joining region 50 is a region formed by providing one or a plurality of emboss rows in which a plurality of sub-embossed portions 51 are arranged at intervals in the vertical direction. The bonding strength of the main bonding region 40 is weaker.
In the cutting step, the diaper continuous body is cut in the vertical direction at the boundary position between the two sub-joining regions 50.

  By following the above steps, the pants-type disposable diaper according to the first aspect of the present invention can be produced continuously and efficiently.

  INDUSTRIAL APPLICABILITY The present invention can provide a pants-type disposable diaper that has good appearance of the side seal portions formed on the left and right side portions of the diaper and that has a good hand feeling in the side seal portions.

FIG. 1 is an external perspective view showing an example of a disposable diaper according to the present invention. FIG. 2 is a development view showing an example of a disposable diaper according to the present invention. FIG. 3 shows an example of a bonding pattern in the side seal portion. FIG. 4 is a view for explaining a bonding pattern in the side seal portion. Fig.4 (a) is sectional drawing of the disposable diaper in Y1-Y1 in FIG. FIG.4 (b) is sectional drawing of the disposable diaper in Y2-Y2 in FIG. FIG. 4C is an enlarged plan view showing the side seal portion. FIG. 5 is an enlarged view showing a joining pattern of a main joining region included in the side seal portion. FIG. 6 is an enlarged view comparing the main joint region and the sub joint region included in the side seal portion. FIG. 7 is a flowchart showing an example of a method for manufacturing a disposable diaper. FIG. 8 shows another example of the bonding pattern in the side seal portion. FIG. 9 shows another example of the bonding pattern in the side seal portion.

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, and includes those appropriately modified by those skilled in the art from the following embodiments.
In the specification of the present application, the term “vertical direction” refers to the vertical direction when the waist opening is the upper end and the crotch is the lower end in a pants-type disposable diaper in which both ends of the front body and the back body are joined. It means a direction (direction indicated by an arrow Y in FIG. 1 and the like). In addition, the “left-right direction” means the circumferential direction of the disposable diaper in the state where both ends of the front body and the back body are joined (the direction indicated by the arrow X in FIG. 1 and the like).
In the present specification, “A to B” means “A or more and B or less”.

(1. Overall configuration of disposable diapers)
The present invention is widely applicable to publicly known pants-type disposable diapers. A pants-type disposable diaper is a disposable diaper of a type in which both sides of a front body and a back body are joined in advance. For example, the pants-type disposable diaper may be of a type having a configuration in which an absorbent main body is cross-linked between a front body exterior body and a back body exterior body formed as separate bodies. Further, the pants-type disposable diaper may be of a type in which an absorbent main body is fixed around the crotch part to an exterior body integrally formed by hanging from the front body to the back body, Among these types of pants-type disposable diapers, the front body outer body and the rear body outer body are provided as separate bodies, and a pants-type disposable diaper of the type in which the absorbent main body is bridged between them is taken as an example The contents of the present invention will be specifically described.

  FIG. 1 is a perspective view showing an example of a disposable diaper 100 as seen from the front body side. FIG. 2 is a development view showing an example of the disposable diaper 100, and shows a state in which the disposable diaper 100 is viewed from the skin contact surface side. As shown in the developed view of FIG. 2, when the disposable diaper 100 is worn, the disposable diaper 100 is applied to the front body 1 that contacts the wearer's abdomen, the back body 2 that contacts the back of the wearer, and the inseam of the wearer. The crotch part 3 is separated. In the present embodiment, the disposable diaper 100 includes a front body exterior body 1a on a front body 1 and a back body exterior body 2a on a back body 2. And the absorptive main body 3a is bridge | crosslinked by the crotch part 3 between the front body exterior body 1a and the back body exterior body 2a. That is, in the present embodiment, the absorbent main body 3a has one end in the longitudinal direction fixed to the front body exterior body 1a, and the other end in the longitudinal direction fixed to the back body exterior body 2a.

  From the unfolded state shown in FIG. 2, the left and right ends of the front body exterior body 1a and the back body exterior body 2a are joined in a state of being overlapped with each other. A pair of left and right side seal portions 4 is formed at the joint portion. Then, in the pair of side seal portions 4, both end portions of the front body exterior body 1 a and the both end portions of the back body exterior body 2 a are joined to correspond to each other from the developed state shown in FIG. 2 to FIG. 1. Assemble to the state shown. As shown in FIG. 1, a waist opening 5 is formed by the upper end edge of the front body exterior body 1a and the upper end edge of the rear body exterior body 2a. Moreover, the both ends of the front body exterior body 1a and the back body exterior body 2a are joined in the side seal part 4, and the leg periphery opening part 6 located around a wearer's leg part at the time of mounting | wearing is formed. . For this reason, the wearer can put on the disposable diaper 100 by putting both legs from the waist opening 5 and taking out each leg from the opening 6 around the legs.

  As shown in FIGS. 1 and 2, the pair of side seal portions 4 includes a main joint region 40 and a sub-joint region 50. The main joint region 40 is intended to fix the left and right end portions of the front body exterior body 1a and the back body exterior body 2a, and extends in the vertical direction to form the front body exterior body 1a and the back body. The exterior body 2a is joined. On the other hand, the sub-joining region 50 is formed outside the main joining region 40 in the left-right direction. The sub-joint region 50 is basically formed to prevent the left and right edges of the front body exterior body 1a and the back body exterior body 2a from being opened to the back, and extends in the vertical direction to extend the front body. The exterior body 1a and the back body exterior body 2a are lightly joined. That is, the bonding strength in the sub bonding region 50 is set to be weaker than at least the bonding strength in the main bonding region 40.

(2. Front body exterior body and back body exterior body)
Next, the structure of each part of the disposable diaper 100 will be described.
As shown in FIGS. 1 and 2, the front body exterior body 1a and the back body exterior body 2a are absorbent between the front body exterior body 1a and the back body exterior body 2a when the disposable diaper 100 is worn. It is a member for holding the main body 3a. The front body exterior body 1a is a member that contacts the abdomen of the wearer when worn, and the rear body exterior body 2a is a member that contacts the back of the wearer when worn.

  Moreover, the front body exterior body 1a and the back body exterior body 2a are mutually joined in the both-sides edge part of the left-right direction, and a pair of side seal part 4 is formed in this junction part. FIG. 3 is an enlarged view of the bonding pattern of the side seal portion 4. As shown in FIG. 3, the side seal portion 4 includes a main joint region 40 that extends in the vertical direction from the upper end to the lower end on the left and right sides of the front body exterior body 1 a and the rear body exterior body 2 a, and the main joint region 40. Also has a sub-joining region 50 for joining the left and right side portions of the front body exterior body 1a and the back body exterior body 2a on the outer side in the left-right direction. In the present embodiment, the main bonding region 40 and the sub bonding region 50 are each formed by a plurality of embossed portions (a main embossed portion 41 and a sub embossed portion 51) gathering. Here, the embossed portions (the main embossed portion 41 and the sub-embossed portion 51) mean each joint point. The main joint region 40 is a band-like region extending in the vertical direction with a width extending from the inner edge of the innermost embossed portion 41 to the outer edge of the outermost one of the plurality of main embossed portions 41. Similarly, the sub-joining region 50 is a band-like region extending in the vertical direction with the width extending from the inner edge of the innermost portion to the outer edge of the outermost portion of the plurality of sub-embossed portions 51. As shown in FIG. 3, the main bonding region 40 and the sub bonding region 50 are formed by arranging a plurality of main embossed portions 41 and a plurality of sub embossed portions 51 in a regular pattern, respectively. . Detailed description of the main joint region 40 and the sub joint region 50 will be described later.

  4A is a cross-sectional view showing a state in which the disposable diaper in the unfolded state shown in FIG. 2 is cut in the longitudinal direction of the disposable diaper along the line Y1-Y1 in FIG. is there. FIG. 4B is a cross-sectional view showing a state in which the disposable diaper in the unfolded state shown in FIG. 2 is cut in the longitudinal direction of the disposable diaper along the line Y2-Y2 in FIG. Originally, various sheet materials are extremely thin, but in FIG. 4A and FIG. 4B, the drawing is performed with a conceptual thickness for easy understanding.

  The front body exterior body 1a and the back body exterior body 2a have an outer sheet 10 on the skin non-contact surface side and an inner sheet 12 on the skin contact surface side. The outer sheet 10 and the inner sheet 12 are formed of, for example, a flexible fiber nonwoven fabric or a plastic sheet. The non-woven fabric and the plastic sheet are bonded with, for example, a hot melt adhesive. However, it is preferable that the hot melt adhesive that joins the outer sheet 10 and the inner sheet 12 does not exist at the site where the main joining region 40 and the sub joining region 50 are to be formed. If a hot melt adhesive is present at a site where the main joining region 40 and the sub joining region 50 are to be formed, the main joining region 40 and the sub joining region 50 are formed by a heat sealing technique using heat sealing or ultrasonic sealing. Even if it tries to form, the heat generated by heat sealing or ultrasonic sealing will be used to dissolve the hot melt adhesive. As a result, the thermoplastic sheet to be bonded cannot be heated sufficiently and the bonding strength is not stable, or the melted hot melt adhesive develops stickiness in the bonded portion, or the hot melt adhesive is solidified. And the problem of becoming hard occurs. Therefore, it is preferable not to apply the hot melt adhesive to the joint portion that forms the side seal portion 4.

  In addition, a plurality of waist stretchable materials 20 are disposed in an extended state along end portions around the waist of the front body exterior body 1a and the back body exterior body 2a. Some of the plurality of waist elastic members 20 are joined to the front body exterior body 1a and the back body exterior body 2a in an expanded state, and form waist gathers by contracting. Moreover, the Tammy elastic material 21 is arrange | positioned at the downward side (crotch lower part side) of the some waist elastic material 20. As shown in FIG. The tammy stretchable material 21 is fixed in an expanded state between the outer sheet 10 and the inner sheet 12, and when the tammy stretchable material 21 contracts, a tammy gather is formed around the abdomen of the disposable diaper.

  As shown in FIGS. 4A and 4B, the front body exterior body 1a and the back body exterior body 2a include an outer sheet 10 in the outermost layer on the skin non-contact surface side. Further, in the front body exterior body 1a and the back body exterior body 2a, the outer sheet 10 is folded back to the skin contact surface side at the folding line 11a at the upper end edge to form the folded portion 11. The fold line 11a on which the outer sheet 10 is folded corresponds to the upper ends of the front body exterior body 1a and the back body exterior body 2a, and becomes an opening edge of the waist opening 5 when the disposable diaper is assembled. The folded portion 11 of the outer sheet 10 extends in the vertical direction with a length that does not reach, for example, the position where the tammy stretchable material 21 is disposed.

  As shown in FIGS. 4A and 4B, in the front body exterior body 1a and the back body exterior body 2a, the outer sheet 10 includes a plurality of waist stretch materials 20 and a plurality of tammy stretch materials 21, which are folded lines. It is arranged in an extended state in the direction along 11a. The number of waist elastic materials 20 should just be two or more, for example, may be 2-15, 4-12, or 6-9. In addition, a plurality of tammy stretchable materials 21 are attached to the outer sheet 10 below the waist stretchable material 20. The number of the Tammy stretchable materials 21 may be, for example, 10 to 30, 15 to 25, or 18 to 20. As shown in FIGS. 4 (a) and 4 (b), the plurality of waist elastic members 20 and the plurality of tammy elastic members 21 are juxtaposed substantially in parallel in the longitudinal direction of the disposable diaper. As shown in the developed view of FIG. 2, the plurality of waist elastic members 20 and the plurality of tammy elastic members 21 are located on the left and right ends of the front body exterior body 1a and the back body exterior body 2a in the extended state. It is preferable to extend to the seal part 4. The plurality of waist elastic materials 20 and the plurality of tammy elastic materials 21 may be fixed by, for example, applying or spraying an adhesive having high fluidity such as a hot melt adhesive. However, it is preferable that the plurality of waist stretchable materials 20 and the plurality of tammy stretchable materials 21 are not present at the sites joined by the side seal portions 4. When the waist elastic material 20 and the tammy elastic material 21 are present in the side seal part 4, heat is generated when trying to join the left and right side parts of the front body exterior body 1 a and the back body exterior body 2 a in the side seal part 4. This is because the heat generated by the seal or ultrasonic seal is used to melt various elastic elastic members, and the joining of the left and right sides of the front body exterior body 1a and the back body exterior body 2a is not stable.

4 (a) and 4 (b), a cushion forming sheet 13 is arranged between the folded portion 11 formed by folding the outer sheet 10 and the plurality of waist elastic members 20. Preferably it is. The cushion forming sheet 13 is a sheet material arranged for the purpose of enhancing the cushioning property and flexibility of the waist gather. The cushion forming sheet 13 is preferably formed of, for example, a nonwoven fabric. The nonwoven fabric of the cushion forming sheet 13 may be a hydrophilic nonwoven fabric or a water-repellent nonwoven fabric. As for this cushion formation sheet 13, it is preferable that the skin contact surface side is intermittently joined to the inward surface (skin non-contact surface side) of the folding | returning part 11 in the direction along the folding line 11a. “Intermittently joining” means that the joined part and the non-joined part continue at a constant interval. When the waist stretchable material 20 and the tammy stretchable material 21 are contracted by intermittently joining the cushion forming sheet 13 and the folded portion 11 in the direction along the folded line 11a, the cushion formed sheet 13 and the folded portion 11 are interposed between each other. A space is created in the waist, and this space can enhance the cushioning and flexibility of the waist gather. The cushion forming sheet 13 is formed to extend in the vertical direction of the diaper. The upper end side of the cushion forming sheet 13 extends to the position of the folding line 11a of the outer sheet 10, and the lower end side of the cushion forming sheet 13 is partially Is superimposed on the skin contact surface side of the inner sheet 12. However, the cushion forming sheet 13 does not have a length that reaches the lower end of the inner sheet 12.
In addition, the disposable diaper which has such a cushion formation sheet 13 is disclosed by Unexamined-Japanese-Patent No. 2011-254996.

  As shown in FIGS. 4A and 4B, the inner sheet 12 is located on the skin contact surface side of the outer sheet 10. The inner sheet 12 sandwiches and fixes a part of the plurality of waist elastic members 20 and the plurality of tammy elastic members 21 between the inner sheet 12 and the outer sheet 10. Although the inner sheet 12 does not reach the upper edge of the outer sheet 10, the inner sheet 12 is formed with a length that reaches the lower edge of the outer sheet 10. The inner sheet 12 may be such that a part of the upper side overlaps the cushion forming sheet 13. Furthermore, the upper part of the inner sheet 12 may overlap the cushion forming sheet 13 and the folded portion 11 of the outer sheet 10.

  Thus, the front body exterior body 1a and the back body exterior body 2a are configured by a plurality of sheet materials overlapping. For example, in the present embodiment, in the first laminated portion 71 that is the uppermost part of the front body exterior body 1a and the back body exterior body 2a, the outer sheet 10, the cushion forming sheet 13, and the The folded portion 11 of the outer sheet 10 overlaps three times. Moreover, in the 2nd lamination | stacking part 72 located in the lower part of the 1st lamination | stacking part 71, the outer sheet | seat 10, the inner sheet | seat 12, the cushion formation sheet | seat 13, and the folding | returning part 11 of the outer sheet | seat 10 in order from the skin non-contact surface side. Quadruple overlap. Moreover, in the 3rd lamination | stacking part 73 located in the lower part of the 2nd lamination | stacking part 72, the outer sheet | seat 10, the inner sheet | seat 12, and the cushion formation sheet 13 have overlapped in order from the skin non-contact surface side. Moreover, in the 4th lamination | stacking part 74 which is the lowest part of the front body exterior body 1a and the back body exterior body 2a, the outer sheet | seat 10 and the inner sheet | seat 12 have overlapped in order from the skin non-contact surface side. . Thus, the front body exterior body 1a and the back body exterior body 2a may have different numbers of overlapping sheet materials depending on the part in the side seal portion 4.

  As described above, the front body exterior body 1a and the back body exterior body 2a configured by overlapping a plurality of sheet materials are joined at the pair of side seal portions 4 located at the left and right ends. That is, the left and right side portions of the front body exterior body 1a and the back body exterior body 2a are joined in a state of being overlapped with each other, and a pair of side seal portions are provided on both sides of the front body exterior body 1a and the back body exterior body 2a. 4 is formed. As a method for joining the front body exterior body 1a and the back body exterior body 2a, for example, heat sealing or ultrasonic sealing is preferably used.

(2-1. Main junction area)
Here, the main joint region 40 included in the side seal portion 4 will be described in detail.
FIG. 4C is an enlarged plan view showing one end portions of the front body exterior body 1a and the back body exterior body 2a joined at the side seal portion 4. The cross-sectional view of FIG. 4A, the cross-sectional view of FIG. 4B, and the plan view of FIG. 4C are all shown to have the same vertical dimension. In particular, FIG. 4C shows an embodiment of a joining pattern of the main joining region 40 in the side seal portion 4. The joining pattern of the main joining region 40 is not limited to that shown in FIG.

  As shown in FIG. 4C, the main joint region 40 extending linearly in the vertical direction of the diaper is divided into two regions: an upper joint region 40a located at the upper part and a lower joint region 40b located at the lower part. Is done. In FIG.4 (c), the upper junction area | region 40a and the lower junction area | region 40b are divided and shown by the dotted line extended in a horizontal direction. The upper bonding region 40a and the lower bonding region 40b do not need to equally divide the main bonding region 40. For example, as shown in FIG. 4C, the upper bonding region 40a is lower than the lower bonding region 40b. It may be formed longer or vice versa. Referring to FIG. 4A, FIG. 4B, and FIG. 4C, the upper joining region 40a and the lower joining region 40b are different in the number of laminated sheet materials to be joined. That is, the upper bonding region 40a has a larger number of laminated sheet materials to be bonded than the lower bonding region 40b. For example, in the embodiment shown in FIG. 4, the upper joint region 40 a includes the front body exterior body 1 a and the back body exterior body 2 a, the first stacked unit 71, the second stacked unit 72, and the third stacked unit 73. Are joined. For this reason, when the number of the sheet material which comprises the front body exterior body 1a and the back body exterior body 2a is match | combined, the upper joining area | region 40a will overlap and join 6 sheets or 8 sheet materials. On the other hand, in the embodiment shown in FIG. 4, the lower joint region 40 b joins the front body exterior body 1 a and the back body exterior body 2 a at the fourth laminated portion 74. For this reason, when the number of the sheet material which comprises the front body exterior body 1a and the back body exterior body 2a is match | combined, the lower joining area | region 40b will overlap and join four sheet materials.

  However, in the main joining region 40, the number of sheet materials joined by the upper joining region 40a and the lower joining region 40b is not limited to the above form. That is, the upper joint region 0a may be any member that overlaps and joins the sheet material of the number equal to or greater than the lower joint region 40b above the lower joint region 40b, and the lower joint region 40b is located below the upper joint region 40a. In addition, it is preferable that the sheet material having a number equal to or less than the upper bonding region 40a is overlapped and bonded.

  As shown in FIG. 4C, the upper joint region 40a is a region where a plurality of upper embossed portions 41a are formed, and the lower joint region 40b is a region where a plurality of lower embossed portions 41b are formed. . In the upper joint region 40a, a plurality of upper embossed portions 41a are formed in a plurality of rows along the vertical direction of the diaper. In the example shown in FIG. 4C, the upper embossed portions 41a are formed in three rows. Of the plurality of rows of the upper embossed portion 41a, the distance from the leftmost row to the rightmost row is the width of the upper joint region 40a. Similarly, a plurality of lower embossed portions 41b are formed in the lower joint region 40b in a plurality of rows along the vertical direction of the diaper. In the example shown in FIG. 4C, the lower embossed portions 41b are formed in three rows. Of the plurality of rows of the lower embossed portion 41b, the distance from the leftmost row to the rightmost row is the width of the lower joint region 40b. The upper embossed portion 41a and the lower embossed portion 41b forming the upper joint region 40a and the lower joint region 40b preferably have a plurality of rows, for example, four to ten rows. Further, the number of rows of the upper embossed portions 41a and the number of rows of the lower embossed portions 41b may be different.

  Here, as shown in FIG. 4C, the width B1 of the lower bonding region 40b is wider than the width Bu of the upper bonding region 40a so as to extend in the left-right direction of the diaper (B1> Bc). ). For example, the width B1 of the lower bonding region 40b is 105% to 150%, 110% to 145%, 115% to 140%, or 120% to 135% with respect to the width Bu of the upper bonding region 40a. It is preferable that In particular, it is preferable that the lower bonding region 40b is wider than the upper bonding region 40a so as to extend both to the left and right of the diaper. Specifically, for example, when the width Bu of the upper joint region 40a is 2 mm to 20 mm, 4 mm to 15 mm, or 5 mm to 10 mm, the width Bl of the lower joint region 40b is 3 mm to 30 mm, 5 mm to 5 mm. It is preferable that it is 20 mm or 6 mm-15 mm. As described above, by making the width B1 of the lower bonding region 40b wider than the width Bu of the upper bonding region 40a, the bonding strength of the lower bonding region 40b with a small number of sheets to be bonded can be improved. The balance with the bonding strength of the upper bonding region 40a having a large number of sheets can be improved. Accordingly, the hardness of the upper bonding region 40a and the lower bonding region 40b is made uniform, and as a result, the touch of the entire side seal portion 4 (particularly the main bonding region 40) is improved. Furthermore, since the lower bonding area 40b has a small number of sheets to be bonded, the bonding section may be easily peeled off when the diaper is worn, but the adhesive strength is improved by increasing the width of the lower bonding area 40b. , Peeling when wearing diapers is prevented. Moreover, since the adhesive strength can be improved without increasing the area of the lower embossed portion 41b itself by expanding the width of the lower bonding region 40b, the side seal portion 4 is easily broken when the diaper is discarded. Become.

The bonding pattern in the main bonding region 40 will be described in more detail.
FIG. 5 is a further enlarged view showing, in an enlarged manner, the portion of the broken line frame shown in FIG. FIG. 5 shows an arrangement relationship between the plurality of upper embossed portions 41a and the plurality of lower embossed portions 41b. As shown in FIG. 4, the upper embossed portion 41a and the lower embossed portion 41b are each formed in three rows, and the respective central rows are located on the same straight line. On the other hand, the left end row and the right end row of the lower embossed portion 41b are formed at positions extending in the left-right direction of the diaper than the left end row and the right end row of the upper embossed portion 41a. For this reason, the width B1 of the lower bonding region 40b is wider than that of the upper bonding region 40a.

  As FIG. 5 shows, it is preferable that each upper embossing part 41a and each lower embossing part 41b are formed in the short line shape extended in the left-right direction of a diaper. The “short-line” upper embossed portion 41a has at least the length Lu in the left-right direction of the upper embossed portion 41a longer than the vertical width Wu of the upper embossed portion 41a, and the value of the length Lu is This means that it is less than half the value of the width Bu of the upper bonding region 40a. Similarly, the “short-line-like” lower embossed portion 41b means that at least the length L1 in the left-right direction of the lower embossed portion 41b is longer than the vertical width Wl of the lower embossed portion 41b and has a length Ll. It means that the value is half or less of the value of the width B1 of the lower junction region 40b. Thus, by forming the upper embossed portion 41a and the lower embossed portion 41b in a short line shape, the side seal portion 4 (particularly the main joining region 40) can be easily broken when the diaper is discarded. That is, since the upper embossed part 41a and the lower embossed part 41b are extended in the left-right direction of a diaper, the force at the time of breaking a diaper can be guide | induced to the outer side of a diaper. For this reason, by making the upper embossed part 41a and the lower embossed part 41b into a short line shape, when the wearer puts a force to break the diaper, the side seal part 4 is easily broken by a series of operations. .

  Moreover, it is preferable that the joining area by each upper embossed part 41a and each lower embossed part 41b is the same. In particular, it is preferable that the length Lu of the upper embossed portion 41a and the length Ll of the lower embossed portion 41b are the same, and the width Wu of the upper embossed portion 41a and the width Wu of the lower embossed portion 41b are the same. For example, in the form shown in FIG. 5, the length Lu of the upper embossed portion 41a and the length Ll of the lower embossed portion 41b are both 0.5 mm to 10 mm, 1 mm to 5 mm, or 1.5 mm to 3 mm. It is preferable. Moreover, it is preferable that the width Wu of the upper embossed part 41a and the width Wl of the lower embossed part 41b are both 0.2 mm to 5 mm, or 0.4 mm to 3 mm. In the present embodiment, as described above, the bonding strength in the lower bonding region 40b can be ensured by increasing the width B1 of the lower bonding region 40b. Therefore, even when the bonding area of the lower embossed portion 41b that forms the lower bonding region 40b is the same as the bonding area of the upper embossed portion 41a that forms the upper bonding region 40a, Bond strength can be secured. Furthermore, by making the bonding area of the lower embossed portion 41b and the bonding area of the upper embossed portion 41a the same, it becomes easy to break the upper bonded region 40a and the lower bonded region 40b through a series of operations when the diaper is discarded.

In FIG. 5, the symbol Su indicates the horizontal spacing between adjacent upper embossed portions 41 a in the upper joint region 40 a. As shown in FIG. 5, it is preferable that the horizontal intervals Su of the rows of adjacent upper embossed portions 41 a are all equal. In particular, the horizontal interval Su between the adjacent upper embossed portions 41a is preferably equal to the length Lu of the upper embossed portions 41a (Su = Lu).
Reference sign S1 indicates the horizontal spacing between adjacent rows of lower embossed portions 41b in the lower joint region 40b. As shown in FIG. 5, it is preferable that the intervals S1 in the left-right direction between the rows of adjacent lower embossed portions 41 b are all equal.
Further, when the interval Su between the rows of the upper embossed portions 41a and the interval Sl between the rows of the lower embossed portions 41b are compared, the value of the interval Sl is preferably larger than the value of the interval Su (Sl> Su). ). For example, the value of the interval S1 between the rows of the lower embossed portions 41b is 110% to 200%, 120% to 180%, or 130% to 160% with respect to the value of the interval Su of the upper embossed portions 41a. 140% to 150% is preferable. As described above, in the present invention, the interval S1 between the rows of the lower embossed portions 41b is secured larger than the interval Su between the rows of the upper embossed portions 41a. The bonding region 40a can be wider than the width Bu.

  As shown in FIG. 5, the width B1 of the lower bonding region 40b is wider than the width Bu of the upper bonding region 40a, so that a plurality of lower portions positioned in the outermost row in the left-right direction in the lower bonding region 40b. A protruding portion O that protrudes outward in the left-right direction with respect to the width of the upper bonding region 40a is formed in the bonding region 40b. In FIG. 5, the protruding portion O is indicated by hatching. The protruding portion O is preferably formed in each of the lower joint regions 40b located in the outermost row in both the left and right directions. For example, the length of the protruding portion O in the left-right direction is preferably 0.1 mm to 1 mm, 0.3 mm to 0.8 mm, or 0.5 mm to 0.6 mm.

In FIG. 5, the symbol Pu indicates the vertical spacing between the plurality of upper embossed portions 41 a in a certain row. As shown in FIG. 5, it is preferable that the vertical intervals Pu of the upper embossed portions 41a are all equal.
Moreover, the symbol Pl indicates the vertical spacing of the plurality of lower embossed portions 41b in a certain row. As shown in FIG. 5, it is preferable that the intervals P1 in the vertical direction of the lower embossed portion 41b are all equal.
Further, when the vertical interval Pu of the upper embossed portion 41a is compared with the vertical interval Pl of the lower embossed portion 41b, the value of the interval Pl is preferably smaller than the value of the interval Pu (Pu). > Pl). For example, the value of the vertical interval Pl of the lower embossed portion 41b is 50% to 95%, 55% to 90%, or 60% to 85% with respect to the value of the vertical interval Pu of the upper embossed portion 41a. It is preferable that it is 65 to 80%. Thus, the bonding strength of the lower bonding region 40b with a small number of sheets to be bonded is improved by making the vertical interval Pl of the lower embossed portion 41b narrower than the vertical interval Pu of the upper embossed portion 41a. Therefore, the balance with the bonding strength of the upper bonding region 40a having a large number of sheets to be bonded can be improved. For this reason, the hardness of the upper joining area | region 40a and the lower joining area | region 40b is equalized, As a result, the touch of the side seal part 4 whole becomes favorable.

As shown in FIG. 5, in the upper bonding region 40 a, it is preferable that the rows of adjacent upper embossed portions 41 a are shifted from each other in the vertical direction of the diaper. In FIG. 5, the symbol Du indicates the distance of deviation between the row of the upper embossed portions 41 a located at the left and right ends and the row of the upper embossed portions 41 a located at the center. For example, the column displacement distance Du of the upper embossed portions 41a is preferably about half the vertical interval Pu of the plurality of upper embossed portions 41a in a certain row.
Similarly, in the lower joining region 40b, it is preferable that the row | line | column of the adjacent lower embossing part 41b is a position mutually shifted | deviated to the up-down direction of the diaper. In FIG. 5, reference sign D <b> 1 indicates the distance of deviation between the row of the lower embossed portions 41 b located at the left and right ends and the row of the lower embossed portions 41 b located at the center. For example, it is preferable that the distance D1 between the rows of the lower embossed portions 41b is about half of the vertical interval Pl between the plurality of lower embossed portions 41b in a row.

  As described above, with respect to the bonding pattern in the main bonding region 40, a plurality of main embossed portions 41 are arranged at intervals in the vertical direction to form a plurality of columns, and the plurality of columns are formed at intervals in the left-right direction. The above pattern is described as an example. However, the bonding pattern in the main bonding region 40 is not limited to the above embodiment. For example, the bonding pattern in the main bonding region 40 may be a straight line extending in the vertical direction, and the main embossed portion 41 forming the main bonding region 40 is a vertically long shape parallel to the side edge of the diaper. It may be. Moreover, the main embossed part 41 may have an inclination of about 1 to 45 degrees, or about 2 to 30 with respect to the side edge of the diaper. Since the main embossed portion 41 has an inclination as described above, the linear pressure can be increased, which is advantageous when the bonding strength is to be maintained or stabilized.

(2-2. Sub-joining region)
Subsequently, the sub-joining region 50 included in the side seal portion 4 will be described in detail.
FIG. 6 is an enlarged view of the inside of the broken line frame shown in FIG. That is, the enlarged view shown in FIG. 6 shows the upper part of the main joint region 40 and the upper part of the sub-joint region 50.

  As shown in FIG. 6, the side seal portion 4 includes a main joining region 40 and a sub joining region 50. In this embodiment, the main joining area | region 40 is a strip | belt-shaped area | region extended in the up-down direction in which the several main embossing part 41 was arrange | positioned at intervals in the up-down direction and the left-right direction as above-mentioned. Also, as shown in FIG. 6, there is a blank space S between the outer edge of the main joint region 40 and the left and right edges 4a of the front body exterior body and the rear body exterior body. Thus, by providing the margin S between the main joint region 40 and the end edge 4a, it is possible to prevent the hard main joint region 40 from being exposed to the end edge 4a and directly touching the wearer's skin. In general, a pants-type diaper is obtained by laminating a plurality of continuous sheet materials, joining them by two pairs of main joining regions 40, and cutting between them to obtain individual pant-type diapers. Therefore, if there is not too much space between the main joining regions 40, there may occur a case where the main joining regions 40 cannot be cut at the time of cutting, and the main joining regions 40 may be cut. If it does so, the dispersion | variation in the joining strength of the main joining area | region 40 will become large. Therefore, by providing the margin S between the main joining region 40 and the edge 4a as described above, a continuous sheet material can be cut between the pair of main joining regions 40 more reliably. From such a viewpoint, it is preferable that the length of the margin S in the left-right direction is at least about 3 mm to 20 mm, or about 5 mm to 10 mm. However, if there is a margin S between the main joining region 40 and the edge 4a, the left and right ends of the front body exterior body and the back body exterior body will be open to the open, and the overall appearance of the diaper may be deteriorated. There is. Therefore, in the present invention, the sub-joining region 50 is formed in the portion of the margin S existing between the main joining region 40 and the end edge 4a, and the portion of the margin S is joined lightly so as not to impair the touch of the diaper. This prevents the left and right ends of the front body exterior body and the back body exterior body from being opened.

  The joining in the sub-joining region 50 is not intended to fix the left and right ends of the front body exterior body and the back body exterior body so as not to peel off when worn, but the left and right sides of the front body exterior body and the back body exterior body It aims at joining lightly so that both ends may not be opened. For this reason, the bonding strength in the sub bonding region 50 is set lower than the bonding strength in the main bonding region 40. For example, the bonding strength in the sub-bonding region 50 is preferably 50% or less, more preferably 30% or less, and more preferably 15% or less, assuming that the bonding strength in the main bonding region 40 is 100%. It is particularly preferred. For example, the bonding strength in the sub bonding region 50 may be 1% to 50%, 1% to 30%, or 1% to 15% with respect to the bonding strength in the main bonding region 40.

The pants-type disposable diaper is designed such that when it is taken off, one or both of the left and right sides can be torn and deployed. In order to reproduce this operation, the “joining strength” is determined by using the tensile strength tester and pulling the main joint region 40 and the sub-joint region 50 from the inside of the diaper in the direction of 180 degrees, and pulling the strength peak value. And
That is, in the present specification, “joining strength” means the tensile strength measured by the method described below.
First, a part including the main joint region 40 and the sub-joint region 50, which are measurement targets of the joint strength, is cut into a predetermined shape (horizontal direction: 25 mm × vertical direction: 30 mm), respectively, and a main joint region test piece and a sub-joint region test. A piece. Subsequently, the main joint region test piece is set in a tensile strength tester (trade name: Strograph V1-B, manufactured by Toyo Seiki Seisakusho Co., Ltd.). The main joint region test piece is set by unfolding the main joint region test piece left and right with the main joint region 40 as the center, and sandwiching and fixing the developed ends from above and below with a chuck. At this time, the distance between the left and right chucks is 20 mm. In this state, the tensile tester is operated, and the tensile strength of the main joining region test piece is measured by pulling the main joining region test piece in the left-right direction. At this time, the tensile speed is set to 200 mm / min, and the measurement is terminated when the main joint region test piece is broken. Then, the maximum tensile strength is confirmed from the obtained measurement chart. This maximum tensile strength is referred to as “joining strength” in the present specification. The sub-joining region 50 can measure “joining strength” in the same manner as the joining strength of the main joining region 40 after the joining portion in the main joining region 40 has been peeled off to the region of S2 in FIG. .

  A specific description will be given by showing numerical values. First, the bonding strength in the main bonding region 40 is preferably 5.0 N / 25 mm or more. For example, the bonding strength in the main bonding region 40 is preferably 5.0 N / 25 mm to 30.0 N / 25 mm. When the bonding strength of the main bonding region 40 is less than 5.0 N / 25 mm, the bonding strength becomes too low, and when the diaper is worn and pulled up with the side edge side of the diaper, the main bonding region 40 peels off. There is a risk that the entire diaper will break. On the other hand, if the bonding strength of the main bonding region 40 exceeds 30.0 N / 25 mm, the bonded portion may hit the skin and feel pain. Further, in order to easily remove the pant-type diaper from the wearer, it is necessary to tear the side edge of the diaper. However, when the bonding strength of the main bonding region 40 exceeds 30.0 N / 25 mm, such a side edge is required. It may be difficult to tear the part.

  On the other hand, the bonding strength in the sub bonding region 50 is preferably 50% or less, 30% or less, or 15% or less with respect to the bonding strength in the main bonding region 40. For example, the bonding strength in the sub bonding region 50 is preferably 0.75 N / 25 mm to 15.0 N / 25 mm. When the bonding strength of the sub-joining region 50 is less than 0.75 N / 25 mm, the joining strength becomes too low, and the sub-joining region 50 is easily peeled depending on the wearer's action, and the sub-joining region 50 is provided. The meaning is almost lost. On the other hand, if the bonding strength of the sub-joining region 50 exceeds 15.0 N / 25 mm, the joining width of the main joining region 40 and the sub-joining region 50 is long, and it is inconvenient because a force is required to break. In addition, when the bonding strength of the sub-joining region 50 exceeds 15.0 N / 25 mm, the touch of the sub-joining region 50 becomes hard, and there is a risk of causing pain when touching the wearer's skin.

As described above, various methods are conceivable as a method for setting the bonding strength in the sub-bonding region 50 to be weaker than the bonding strength in the main bonding region 40.
In order to set the bonding strength in the sub-joint region 50 to be weak, for example, (A) the joint area in the sub-joint region 50 is made smaller than the joint area in the main joint region 40, or (B) in the sub-joint region 50 The sum of the vertical lengths of the plurality of sub-embossed portions 51 arranged in the vertical direction is made shorter than that in the main joint region 40, or (C) the depth of each sub-embossed portion 51 in the sub-joint region 50 is set. It is conceivable to make the depth smaller than the depth of each main embossed portion 41 in the main bonding region 40. Hereinafter, an example of a method for reducing the bonding strength in the sub-joining region 50 will be described, but the sub-joining region 50 in the present invention is not limited to this.

  Regarding (A), in order to set the bonding strength in the sub-joining region 50 to be weak, the joining area in the sub-joining region 50 may be made smaller than the joining area in the main joining region 40. That is, even if the area of each sub-embossed portion 51 provided in the sub-joined region 50 is the same as the area of the main embossed portion 41 provided in the main-joined region 40, the vertical direction of the emboss pattern in the sub-joined region 50 The bonding strength in the sub-joining region 50 can be weakened by making the spacing in the horizontal direction and the spacing in the left-right direction wider than the emboss pattern in the main joining region 40.

  For example, in FIG. 6, the symbol Ps indicates the vertical interval between the plurality of sub-embossed portions 51 in a certain row. As shown in FIG. 6, the vertical interval Ps between the sub-embossed portions 51 is preferably wider than the vertical interval Pu between the main embossed portions 41 (upper embossed portions 41 a). For example, the vertical interval Ps between the sub-embossed portions 51 is preferably 200% to 1000% or 300% to 600% with respect to the vertical interval Pu between the main embossed portions 41. Further, in FIG. 6, reference sign Ds indicates the distance of vertical displacement between the sub-embossed portion 51 located in a certain row and the sub-embossed portion 51 located in the adjacent row. Thus, in the case where the rows of the sub-embossed portions 51 are offset, the shift distance Ds is preferably wider than the vertical interval Pu between the main embossed portions 41. For example, the distance Ds is preferably 150% to 500%, or 200% to 300% with respect to the interval Pu.

  Further, in FIG. 6, a symbol Gs indicates a space in the left-right direction between the rows of the sub-embossed portions 51. As shown in FIG. 6, the horizontal gap Gs between the rows of the sub-embossed portions 51 is preferably wider than the horizontal gap Gs between the rows of the main embossed portions 41. For example, the horizontal gap Gs of the rows of the sub-embossed portions 51 is preferably 120% to 500%, or 150% to 300% with respect to the horizontal gap Gs of the rows of the main embossed portions 41. In this way, by making the vertical and horizontal intervals of the emboss pattern in the sub-joint region 50 wider than the emboss pattern in the main joint region 40, the joint area in the sub-join region 50 can be reduced. It can be made narrower than the bonding area.

  More specifically, the bonding area ratio of the sub bonding region 50 is preferably smaller than the bonding area ratio of the main bonding region 40. Here, the bonding area ratio of the sub-joining region 50 is a ratio of the total area of the plurality of sub-embossed portions 51 to the total area of the sub-joining region 50. Similarly, the bonding area ratio of the main bonding region 40 is the ratio of the total area of the plurality of main embossed portions 41 to the entire area of the main bonding region 40. The total area of the main bonding area 40 and the sub-bonding area 50 is the area of the band-shaped area extending in the vertical direction with the width from the inner edge of the embossed portion to the outer edge of the outermost one of the embossed portions. Can be obtained as The total area of the plurality of main embossed portions 41 and the total area of the plurality of subembossed portions 51 are obtained by multiplying the area of each embossed portion by the number of embossed portions belonging to the main bonded region 40 or the subbonded region 50. be able to. The bonding area ratio of the sub-joining region 50 determined thereby is preferably 1% to 50%, more preferably 1% to 30% with respect to the bonding area ratio of the main bonding region 40, 1% to 15% is particularly preferable. The area of one sub-embossed portion 51 is preferably about 50% to 200% and more preferably 70% to 150% with respect to the area of one main embossed portion 41.

  Further, as shown in FIG. 6, the width Bs of the sub-joining region 50 is preferably narrower than the width Bu of the main joining region 40 (upper joining region 40a). The width Bs of the sub-joining region 50 is preferably 40% to 95% or 50% to 70% with respect to the width Bu of the main joining region 40 (upper joining region 40a).

  Regarding (B) above, in order to set the bonding strength in the sub-joining region 50 to be weak, the sum of the vertical lengths of the plurality of sub-embossed portions 51 arranged in the vertical direction in the sub-joining region 50 is determined as the main joining region. It may be shorter than that in 40. That is, in the present specification, “joining strength” is defined as a peak value of tensile strength when the main joining region 40 and the sub joining region 50 are opened from the inside of the diaper in the direction of 180 degrees and pulled as described above. Therefore, it can be said that the longer the sum of the vertical lengths of the plurality of embossed portions arranged in the vertical direction, the higher the bonding strength, and the shorter the lower the bonding strength. In this case, “the total length in the vertical direction of the plurality of embossed portions arranged in the vertical direction” means that when a virtual line extending in the vertical direction is drawn parallel to the side edge of the disposable diaper, the virtual line is taken. This means the sum of the lengths of the sides in the vertical direction of the plurality of embossed portions. In addition, when the information height side of each embossed part is not parallel to the assumed line, it means the length that each embossed part crosses the assumed line in the vertical direction. For example, the sum of the vertical lengths of the plurality of sub-embossed portions 51 arranged in the vertical direction in the sub-joint region 50 is the length in the vertical direction of the plurality of main embossed portions 41 arranged in the vertical direction in the main joint region 40. 1% to 50%, 1% to 30%, or 1% to 15% is preferable.

  Regarding (C) above, in order to set the bonding strength in the sub-joining region 50 to be weak, the depth of each sub-embossed portion 51 in the sub-joined region 50 is set to be greater than the depth of each main embossed portion 41 in the main joint region 40. It may be shallow. When the side seal portion 4 is formed by heat sealing or ultrasonic sealing, the height of the pattern block used for heat sealing or ultrasonic sealing is actually the same height as that obtained by performing processing called cylindrical polishing. The surface is processed by forming a curve like a cylindrical surface. Therefore, the embossed pattern arranged on the pattern block once becomes the same height. Therefore, after the embossed pattern is processed to the same height, the pattern block forming each sub-embossed portion 51 of the sub-joining region 50 may be further polished so that the height of the pattern block is reduced. For example, the height of the pattern block that forms the sub-embossed portion 51 is preferably 3 μm or less lower than the height of the pattern block that forms the main embossed portion 41. For example, the height of the pattern block that forms the sub-embossed portion 51 is preferably about 3 μm to 100 μm or 5 μm to 50 μm lower than the height of the pattern block that forms the main embossed portion 41. The height of the pattern block that forms the sub-embossed portion 51 may be gradually increased toward the pattern block that forms the main embossed portion 41. By doing in this way, it can be made shallower than the depth of each sub-embossed part 51 in junction field 50 formed in side seal part 4, and the depth of each main embossed part 41 in main junction field 40. If the depth of each sub embossed part 51 becomes shallow, the joint strength in sub joint field 50 will become weak as a result. In addition, if the joining strength in the subjoining area | region 50 can be set to an appropriate range by adjusting the depth of each subembossing part 51, the embossing pattern of the main joining area | region 40 and the embossing pattern of the subjoining area | region 50 will be the same. The same pattern may be used.

  In the above description, the embossing pattern of the sub-joining region 50 is compared with the embossing pattern of the main joining region 40, but the embossing pattern of the sub-joining region 50 and the embossing pattern of the main joining region 40 include In some cases, each region has different bonding strength. For example, the embossing pattern of the sub-joining region 50 and the embossing pattern of the main joining region 40 may have different joining area ratios, vertical spacings between the embossed portions, horizontal spacings, and the like depending on the parts. As described above, when the sub-joining region 50 and the main joining region 40 have a plurality of types of joining area ratios, vertical spacings between the embossed portions, lateral spacings, and the like, The comparison of 40 may be performed by cutting out predetermined portions adjacent in the left-right direction. For example, as described in the description of the method of measuring the “bond strength”, the sub-joint region 50 and the main joint region 40 are compared with each other in a predetermined region (left-right direction: 25 mm × vertical direction: 30 mm) adjacent in the left-right direction. Cut out and compare.

  Further, as shown in FIG. 6, the embossing pattern of the sub-joining region 50 includes a plurality of sub-embossed portions 51 arranged in the vertical direction with a plurality of rows, and the plurality of rows of the sub-embossed portions 51. Are preferably formed with an interval in the left-right direction in a state where they are offset from each other. Moreover, it is suitable for each sub-embossed part 51 that the length in the left-right direction is 2 mm to 5 mm and the length in the vertical direction is 0.3 to 5 mm. Furthermore, the vertical distance between the sub-embossed portions 51 is preferably in the range of 5 mm to 50 mm.

  Moreover, it is preferable that the subjoining area | region 50 is formed in the position within 5 mm from the edge 4a of the right-and-left both sides of a diaper. That is, it means that any of the sub-embossed portions 51 provided in the sub-joining region 50 is disposed within 5 mm from the end edge 4a of the diaper. For example, in FIG. 6, the distance between the outermost edge of the subjoining area | region 50 and the edge 4a of the both sides of a diaper is shown by code | symbol S1. This distance S1 is preferably within 5 mm. Thus, even if the left and right end edges of the front body exterior body and the back body exterior body are turned up by forming the sub-joining region 50 at a position within 5 mm from the edge 4a of the diaper, the turn up width is a maximum of 5 mm. It is effective because it can be suppressed within. As will be described later, the sub-joining region 50 may reach the edge 4a of the diaper, and the distance S1 may be 0 mm. Since the joining strength of the sub joining region 50 is lower than that of the main joining region 40, even if the cross section of the sub embossed portion 51 is exposed at the end edge 4a of the diaper, the touch of the end edge 4a of the diaper is not touched. It can prevent damage.

  In addition, as shown in FIG. 6, it is preferable that a region (non-joined region) without a joint exists between the main joint region 40 and the sub-joint region 50. In FIG. 6, the width of the non-joining region existing between the main joining region 40 and the sub-joining region 50 is indicated by reference sign S2. For example, the width S2 of the non-bonded region is preferably 0.5 mm to 4 mm, or 1 mm to 3 mm, and particularly preferably 1.5 mm or more. By doing in this way, when discarding a disposable diaper, when peeling the side seal part 4, it becomes easy to peel the subjoining area | region 50. FIG. That is, when peeling the side seal part 4, normally, it peels toward the outer side from the inner side of a diaper. For this reason, the main joining area | region 40 is peeled first, and the sub joining area | region 50 is peeled after that. Here, since the non-joining region exists between the main joining region 40 and the sub-joining region 50, the force that the user breaks the side seal portion 4 is not removed after the main joining region 40 is completely broken. Further momentum is generated in the bonding region, the sub-bonding region 50 is reached with the momentum, and the sub-bonding region 50 is broken. For this reason, the user can feel that the side seal part 4 is easily broken. In the present invention, since the side seal part 4 has the main joint region 40 and the sub joint region 50, the entire width of the side seal part 4 is wider than the conventional side seal part that does not have the sub joint region 50. Become. In this respect, the non-joining region is provided between the main joining region 40 and the sub-joining region 50 as described above, and the sub-joining region 50 is formed by giving the user a sense that the side seal portion 4 is easily broken. The difficulty of breaking the side seal portion 4 due to the provision can be eliminated.

(2-3. Side seal portion forming step)
Then, with reference to FIG. 7, the formation process of the side seal part performed in the manufacturing method of an underpants type disposable diaper is demonstrated. The step of forming the side seal portion is basically performed at the final stage of the manufacturing method for the pants-type disposable diaper. FIG. 7 conceptually shows a final-stage flow of the manufacturing method of the pants-type disposable diaper.

  As shown in FIG. 7, according to a general manufacturing method, a diaper continuous body 100 ′ in which a plurality of disposable diapers are arranged in the left-right direction is obtained (step S1). The diaper continuous body 100 ′ is a continuous body 1 a ′ by connecting a plurality of front body exterior bodies in the left-right direction at a site where the side seal portion 4 is to be formed, and a plurality of rear body exterior bodies. The body is connected in the left-right direction at a site where the side seal portion 4 is to be formed, thereby forming a continuous body 2a ′. Moreover, in the diaper continuous body 100 ′, the absorbent main body 3a is disposed so as to be orthogonal to the front body exterior body, the continuous body 1a ′, and the back body exterior body continuous body 2a ′. At this time, a hot melt adhesive for fixing the waist stretchable material 20 and the tammy stretchable material 21 to the exterior body is applied to the portion where the side seal portion 4 is to be formed in the diaper continuous body 100 ′. Preferably not. That is, the hot melt adhesive is partially applied intermittently along the left-right direction (flow direction) of the diaper continuous body 100 ′, and the intermittent portion 110 is a portion where the side seal portion 4 is to be formed. Has been adjusted to match. As a result, the elastic expansion member and the hot melt adhesive for fixing the elastic expansion member do not exist at the site where the side seal portion 4 is to be formed.

  Subsequently, the diaper continuous body 100 'is folded in the vertical direction in the crotch region where the absorbent main body 3a is disposed (step S2). Accordingly, the continuum 1a ′ of the front body exterior body and the continuum 2a ′ of the rear body exterior body are overlapped with each other. At this time, the positions of the intermittent portion 110 formed on the continuum 1a ′ side of the front body exterior body and the intermittent portion 110 formed on the back body exterior body 2a ′ side coincide with each other.

  Then, the side seal part 4 is formed with respect to the diaper continuous body 100 'with which the front body and the back body are overlapped (step S3). The side seal part 4 is formed at a position corresponding to the left and right side parts of the front body and the back body when the individual pants-type disposable diaper 100 is obtained. Here, as shown in FIG. 7, the side seal portion 4 is formed on the right side of one pant-type disposable diaper and formed on the left side of another adjacent pant-type disposable diaper. Are formed side by side in two lines. Forming the two side seal portions 4 at a time means that the two embossed patterns are engraved on the pattern block of the embossing roll that performs heat sealing or ultrasonic sealing. For this reason, by introducing the diaper continuous body 100 'between such an embossing roll and an anvil roll, the side seal portion 4 is formed side by side by only one rotation of the embossing roll and the anvil roll. It becomes. Here, as shown in the enlarged view of the side seal portion 4 in FIG. 7, as described above, each side seal portion 4 has a main joint region 40 and a cutting line (dashed line) than the main joint region 40. ) And a sub-joining region 50 provided at a position close to it. As shown in the enlarged view of FIG. 7, the two side seal portions 4 are formed in a state where the sub-joining regions 50 are adjacent to each other. That is, the planned cutting line (dashed line) of the diaper continuous body 100 ′ is located between the two sub-joining regions 50.

  Thereafter, the diaper continuous body 100 ′ in which the side seal part 4 is formed is cut in the vertical direction along a planned cutting line (a chain line) positioned between the two side seal parts 4 (step S <b> 4). That is, the diaper continuous body 100 ′ is cut at the boundary between the two sub-joining regions 50. Thereby, the individual underpants type disposable diaper 100 is cut off from the diaper continuous body 100 '. Through the above steps, the pants-type disposable diaper 100 of the present invention can be manufactured.

(2-4. Other embossed pattern in side seal part)
Next, with reference to FIG. 8A, FIG. 8B, FIG. 9A, and FIG. 9B, a pattern different from the emboss pattern shown in FIG. The embossed pattern shown in FIGS. 8 and 9 is different from the pattern in FIG. 3 and the like, and at least two of the plurality of sub-embossed portions 51 formed in the sub-joining region 50 are the front body 1 and the embossed pattern. The left and right side edges 4a of the back body 2 are reached. As shown in the patterns shown in FIGS. 8 and 9, the plurality of sub-embossed portions 51 reach the left and right end edges 4 a of the front body 1 and the back body 2. It is possible to prevent the edge 4a from being opened.

  More specifically, in the emboss pattern of FIG. 8A, a plurality of substantially elliptical sub-embossed portions 51 are spaced apart in the vertical direction along the planned cutting line (dashed line) of the diaper continuous body. They are arranged in rows. For this reason, by cutting the diaper continuous body along the planned cutting line, the plurality of sub-embossed portions 51 on the planned cutting line is divided into two. Thereby, in the subjoining area | region 50 in each side seal part 4, the parted subembossed part 51 will reach the edge 4a of the right and left sides of a diaper.

  In the embossing pattern shown in FIG. 8B, the sub-joining region 50 is formed by a plurality of short embossed sub-embossed portions 51, and this sub-joining region 50 is in the vicinity of the planned cutting line (dashed line). It is relatively concentrated. A plurality of short embossed sub-embossed portions 51 are also arranged on the planned cutting line in rows spaced in the vertical direction. In the emboss pattern shown in FIG. 8B, the row of the sub-embossed portions 51 arranged on the planned cutting line is displaced in the vertical direction from the row of the adjacent sub-embossed portions 51.

  The emboss pattern in FIG. 9A is a modification of the emboss pattern in FIG. In the emboss pattern shown in FIG. 9A, the rows of the sub-embossed portions 51 arranged on the planned cutting line and the rows of the sub-embossed portions 51 located on both sides thereof are shifted in the vertical direction. It has become a thing.

  In the emboss pattern shown in FIG. 9B, a plurality of long sub-embossed portions 51 that are long in the left-right direction extend vertically along the planned cutting line so as to straddle the planned cutting line (dashed line). Arranged in a row in the direction. The long line-shaped sub-embossed portion 51 has a length in the left-right direction of 3 mm to 15 mm, and preferably 5 mm to 10 mm. The long-line-shaped sub-embossed portion 51 is divided into members belonging to the two sub-joining regions 50 by cutting the diaper continuous body along the planned cutting line. According to the embossing pattern shown in FIG. 9 (b), it is possible to more reliably prevent the edges of both side portions of the disposable diaper from being turned up.

  The embossing pattern in the side seal portion 4 has been described above by taking a preferable form as an example. However, in the present invention, the embossing pattern of the side seal portion 4 is not limited to the above embodiment, and can be appropriately changed by those skilled in the art from the above embodiment within the obvious range.

(3. Absorbent body)
Finally, the structure of the absorbent main body 3a held by the front body exterior body 1a and the back body exterior body 2a described above will be described.
The absorbent main body 3a is held in a state of being bridged between the front body exterior body 1a and the back body exterior body 2a, and is positioned at the wearer's crotch portion when the disposable diaper 100 is worn. Absorb and retain liquid such as urine. The absorptive main body 3a is arrange | positioned over the front body 1 and the back body 2 centering on the crotch part 3 of a disposable diaper.
As shown in FIG. 2, the absorbent main body 3 a has an absorbent body 31, a top sheet 32, a back sheet 33, and a pair of three-dimensional gathers 34 as a basic configuration.

  The absorber 31 is a member for absorbing a liquid such as urine and holding the absorbed liquid. The absorber 31 is disposed between the liquid-permeable top sheet 32 and the 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. A well-known material can be employ | adopted for the absorptive material which comprises the absorber 31. FIG. As an absorptive material, it is good also as using a flap pulp, a superabsorbent polymer, or a hydrophilic sheet, for example. Moreover, as an absorptive material, 1 type may be used independently among flap pulp, a superabsorbent polymer, or a hydrophilic sheet | seat, and it is good also as using 2 or more types together. The absorbent material is usually formed and used in a single-layer or multi-layer mat shape. The shape of the absorber 31 can be appropriately designed according to the shape, size, and application of the disposable diaper. For example, the shape of the absorber 31 may be an hourglass shape as shown in FIG. Moreover, it is good also as a rectangular shape, an elliptical shape, or a gourd shape currently used for the general disposable diaper.

  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 absorbent body 31. For this reason, the top sheet 32 is made of a liquid-permeable material having high flexibility. Moreover, the top sheet 32 is arrange | positioned so that the skin contact surface side of the absorber 31 may be coat | covered. 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 thermoplastic resin fiber such as polypropylene, polyethylene, polyester, or nylon may be hydrophilized and further made into a nonwoven fabric.

  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 to the outside of the diaper. For this reason, the back sheet 33 is made of a liquid-impermeable material. The back sheet 33 covers the absorbent body 31 from the non-skin contact surface side in order to prevent liquid leakage from the bottom surface of the absorbent body 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.

  The pair of three-dimensional gathers 34 are members that stand along both side edges of the absorber 31 and prevent side leakage of urine excreted by the wearer. Each of the three-dimensional gathers 34 is provided with a three-dimensional gather stretchable material 35 at its tip, and when the three-dimensional gather stretchable material 35 contracts, it rises in the direction of the wearer's skin contact. For this reason, the pair of three-dimensional gathers 34 serves as a urine leak-proof wall, and urine that has not permeated through the top sheet 32 or urine that has not been absorbed by the absorber 31 can be obtained from the openings around the legs of the disposable diaper. Prevent leaking side leaks. The three-dimensional gather 34 can employ | adopt the well-known structure used for the conventional disposable diaper. The three-dimensional gather 34 can be formed, for example, by sandwiching and fixing a stretched three-dimensional gather stretchable material 35 between the layers of the water-repellent sheet. As the water-repellent sheet, for example, a non-woven sheet obtained by a production method such as card embossing or spunbond can be used, and it is particularly preferable to use a non-woven sheet such as SMS or SMMS having high waterproofness. The three-dimensional gather elastic member 35 is usually made of a thread-like elastic rubber. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, and polyester can be used.

  The present invention relates to a pants-type disposable diaper for infants and the elderly. Therefore, the present invention can be suitably used in industries related to child care and nursing care.

DESCRIPTION OF SYMBOLS 1 ... Front body 1a ... Front body exterior body 2 ... Back body 2a ... Rear body exterior body 3 ... Crotch part 3a ... Absorbent main body 4 ... Side seal part 4a ... Edge 40 ... Main joint area 40a ... Upper joint area 40b ... Lower bonding region 41 ... main embossed portion 41a ... upper embossed portion 41b ... lower embossed portion 50 ... sub-joined region 51 ... sub-embossed portion 100 ... disposable diaper 100 '... diaper continuous body 110 ... intermittent portion

Claims (2)

A front body (1) in contact with the wearer's abdomen, a back body (2) in contact with the back of the wearer, and a crotch portion (3) positioned between the front body (1) and the back body (2) A pant-type disposable diaper manufacturing method comprising:
Obtaining a diaper continuum in a state where a plurality of the disposable diapers are continuous in the left-right direction;
Folding the diaper continuum at the crotch (3) and superimposing the front body (1) and the back body (2);
A joining step of forming side seal portions (4) for heat-sealing and joining the left and right sides of the front body (1) and the left and right sides of the back body (2) by heat sealing or ultrasonic sealing;
Cutting the diaper continuum vertically at positions corresponding to the left and right edges (4a) of the front body (1) and the back body (2) to obtain individual pants-type disposable diapers; Including,
The side seal part (4) formed in the joining step is
A main joining region (40) extending in the vertical direction;
A sub-joining region (50) located on the outer side in the left-right direction than the main joining region (40) and extending in the vertical direction;
Have
The sub-joining region (50) is a region formed by providing one or a plurality of embossed rows in which a plurality of sub-embossed portions (51) are arranged at intervals in the vertical direction,
The bonding strength of the sub-bonding region (50) is weaker than the bonding strength of the main bonding region (40),
In the cutting step,
The manufacturing method of the underpants type disposable diaper which cut | disconnects the said diaper continuous body to an up-down direction in the boundary position of two subjoining area | regions (50). In the cutting step, the diaper continuous body is cut in the vertical direction while dividing at least two of the plurality of sub-embossed portions (51) formed in the sub-joining region (50).
The manufacturing method of the underpants type disposable diaper of Claim 1.

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