KR101744036B1 - Pant-type disposable diaper and manufacturing method therefor - Google Patents

Abstract

Provided is a pull-on type disposable diaper having good side-seal portions formed on left and right sides of a diaper and having a good feel on the side-sealed portion. The present invention relates to a pants-type disposable diaper having a pair of side seal parts (4), wherein the pair of side seal parts (4) have a main bonding area (40) And a sub-junction region (50) located outside the direction and extending in the vertical direction. The joining strength of the sub-joining region 50 is determined by the ratio of the number of the embossing regions 51 to the number of the embossing regions 51. The joining region 50 is a region formed by one or more rows of embossing rows in which a plurality of sub- Is set to be weaker than the bonding strength of the bonding region (40).

Description

TECHNICAL FIELD [0001] The present invention relates to a disposable diaper and a method of manufacturing the disposable diaper,

The present invention relates to a disposable diaper for absorbing and retaining liquid such as urine, which is attached to a crotch of a wearer, and a method of manufacturing the disposable diaper. More particularly, the present invention relates to a disposable diaper which is formed in a pants shape by joining the left and right side portions of the front and back portions of the trunk with the side seal portion, and a method of manufacturing the same.

BACKGROUND ART [0002] Conventionally, for example, a disposable diaper having a pants shape is mounted for infants or elderly people. A typical pants-type disposable diaper includes an absorbent main body having a liquid absorbing function and a cover sheet for holding the absorbent main body in the wearer's crotch. The cover sheet is previously bonded to both the front and rear portions of the body and rear portion of the body so that the disposable diaper is formed into a pants shape. Therefore, the wearer can insert the pants-type disposable diaper by inserting the leg portions in the opening portion around the waist. In addition, in the side seal portion, since the body front portion and the both end portions of the rear portion of the body are joined at a proper bonding strength, the side seal portion is torn, so that the wearer can easily take off the disposable diaper of pants type.

Such a side seal portion is generally formed by thermally fusing thermoplastic sheet members constituting the diaper cover sheet by a heater seal or an ultrasonic seal. For example, a heater seal is a laminated sheet having a plurality of thermoplastic sheets stacked between an embossing roll having a block on which a bonding pattern is formed on one side and a pair of rolls made of a flat anvil roll, To heat and pressurize the sheet to melt the sheet. Further, the ultrasonic seal is formed by introducing a plurality of thermoplastic sheets laminated between a block in which a bonding pattern is formed and an ultrasonic horn for transmitting ultrasonic vibration, and ultrasonic vibration is applied while pressing the sheet to melt the sheet with frictional heat Technology.

As described above, a technique of forming a pair of side seal portions on the left and right side portions of the disposable diaper by the heater seal or the ultrasonic seal is disclosed in, for example, Patent Documents 1 and 2. [

[Patent Document 1] Japanese Patent Laid-Open No. 2004-523374 [Patent Document 2] Japanese Unexamined Patent Publication No. 2002-102283

However, the cover sheet constituting the body front surface portion and the back surface portion of the body of the disposable diaper is bonded only at the joint portions extending in the vertical direction, and is not bonded at portions other than the joint portions. That is, since the cover sheet of the body front face portion and the cover sheet of the rear body portion of the body are not bonded to each other at the portions outside the joining portion in the left and right direction, the cover sheet of the body front face portion and the cover sheet of the body rear face portion are opened There was a problem that this was not good.

However, in many cases, the diaper cover sheet is fixed with an elastic stretchable member for imparting stretchability. For example, the elastic stretchable member is sandwiched between the layers of the plurality of sheet members at the waist circumference of the front portion of the trunk and the rear portion of the trunk and around the abdomen, and is fixed with a hot-melt adhesive or the like. As a method of applying the hot-melt adhesive, for example, there is a case of applying to the surface of the sheet member constituting the cover sheet and a case of applying directly to the elastic stretchable member. In addition to fixing the elastic stretchable member to the other cover sheet, a hot-melt adhesive may be applied to join the cover sheets of the body front portion and the back portion of the body to each other. Here, as described above, when the side seal portion is formed on the right and left side portions of the disposable diaper, a bonding technique called a heater sealing or an ultrasonic sealing is used. These heater seals and ultrasonic seals are made to bond the thermoplastic sheets together by heat fusion. However, if a hot-melt adhesive is present at the joining portion of the thermoplastic sheet, heat to melt the hot-melt adhesive is used, the thermoplastic sheet to be joined can not be heated sufficiently and the bonding strength is not stabilized or the melted hot- There arises a problem that tackiness is manifested or the embossing pattern of the joint is solidified in a disordered state and hardened. Therefore, with regard to the joining of the side seal portion, it is considered that it is preferable not to apply the hot-melt adhesive to this joining portion. Therefore, it is preferable not to apply a hot-melt adhesive to the portion of the disposable diaper where the side seal portion is to be formed, and to prevent the elastic stretchable member from being fixed. For example, by intermittently applying a hot-melt adhesive for fixing the elastic stretchable member, except for a portion where the side seal portion is formed, it can be said that at least the hot-melt adhesive and the elastic stretchable member do not exist in the side seal portion. However, by applying the hot-melt adhesive intermittently, both left and right side portions (side-sealed portions) of the disposable diaper have areas where no hot-melt adhesive is present. Therefore, both of the completed disposable diapers have a cover sheet of the front portion of the body and a cover sheet There is a region (non-bonded portion) in which the body front portion and the rear portion of the body do not bond to each other in the left and right direction outer region than the joint portion (main bonding region) for binding purposes. In this case, the left and right ends of the disposable diaper have the problem that the cover sheet of the body front portion and the cover sheet of the back portion of the body are opened at the non-sticking portion, and the appearance is poor.

It is also conceivable to form the joining portions at positions close to both ends of the left and right sides of the diaper in order to prevent the front surface of the trunk, the cover sheet and the back cover portion of the body from being opened at the left and right sides as described above. However, as described later, the pants-type diaper is obtained by laminating a plurality of continuous sheet materials, joining them by a pair of two pairs, and cutting them between the pair, thereby obtaining the individual pants-type diaper. Therefore, if there is no gap between the joints, there is a case where the joints are not cut off at the time of cutting, and there is a fear that the joints are cut off. Then, the deviation of the joining strength of the joining portion becomes large. Also, since the cross section of a plurality of joints is exposed to the cut portion, the touch is also lowered. Therefore, conventionally, it has been pointed out that it is not preferable to form the joints (main joint regions) for binding the cover sheet of the front portion of the trunk and the cover sheet of the rear portion of the trunk portion at positions close to the edges of the left and right sides of the diaper.

As described above, according to the conventional technique, it is difficult to make both the aesthetic appearance of the side seal portion of the pull-on type disposable diaper better and the feel of the side seal portion better. Therefore, the present invention relates to a side seal portion of a pull-on type disposable diaper, which prevents both the cover sheet at the front of the body and the cover sheet at the rear portion of the body from being open at both right and left sides of the diaper, There is a demand for a technique for preventing damage.

The inventors of the present invention have made intensive investigations on the means for solving the problems of the above-described prior art. As a result, the inventors of the present invention have found that the body front portion of the disposable diaper and the left and right side portions of the back portion of the body are fastened at the main joint region, And the cover sheet of the body front portion and the cover sheet of the body rear portion are prevented from opening so that the beauty of the pull-on type disposable diaper is improved and at the same time, It is possible to prevent the tactile sensation of both sides from being damaged. On the basis of the above finding, the present inventors came to the idea that the problems of the prior art can be solved and accomplished the present invention.

More specifically, the present invention has the following configuration.

A first aspect of the present invention relates to a pull-on disposable diaper.

The disposable diaper according to the present invention comprises a body front portion 1 which is in contact with the abdomen of a wearer, a rear body 2 which is in contact with the back portion of the wearer, a body front portion 1 and a crotch portion And (3). The pants-type disposable diaper includes a pair of side seal portions 4 which are joined together by heaters or ultrasonic seals in a state in which the left and right side portions of the body front portion 1 and the left and right side portions of the body rear portion 2 are superimposed, Respectively.

The pair of side seal portions 4 includes a main bonding region 40 extending in the up and down direction, a sub bonding region 50 located outside the main bonding region 40 in the lateral direction and extending in the up and down direction, Lt; / RTI >

The non-bonded region 50 is an area formed by one or more rows of embossing lines in which the plurality of embossed portions 51 are arranged in the vertical direction at intervals.

As described above, the pull-on type disposable diaper according to the present invention is characterized in that the body front portion and the back portion of the body are loosened at the left and right outer portions than the main joint region 40 for the purpose of binding the body front portion and the left and right sides of the back portion of the body A non-junction region 50 is formed for the purpose of preventing the above-described problem. By providing the non-joined region 50 in this way, the cover sheet on the front surface of the trunk and the cover sheet on the back surface of the trunk can be opened and closed so that the appearance of the diaper is deteriorated. In addition, the bonding strength of the non-bonding region 50 is weaker than that of the main bonding region 40. That is, the non-joined region 50 is not intended to bond both the front and back sides of the body of the diaper, but it is sufficient if it is possible to prevent the cover sheet from being unwound from both sides of the diaper. Can be made much weaker than the bonding strength of the main bonding region (40). Therefore, even if the non-joined region 50 is provided, the feeling of the diaper is hardly damaged, and consequently the feeling of wearing of the diaper can be improved.

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

By making the bonding strength in the non-bonding region 50 equal to or less than half of the bonding strength in the main bonding region 40 as in the above-described configuration, the entire non-bonding region 50 can be kept soft. Further, by setting the bonding strength to be low in the non-joined region 50, it is possible to prevent the left and right side portions of the diaper bonded by the side seal portion 4 from being torn easily when the wearer removes the disposable diaper.

In the pull-on disposable diaper of the present invention, the adhesive is not applied to the main bonding region 40 and the sub-bonding region 50, and only the body front portion 1 and the back body portion 2 are joined to each other on the left and right sides. For example, in the main bonding region 40 and the sub bonding region 50, the sheet members constituting both the left and right side portions of the body front portion 1 and the back side portion 2 of the body are not bonded by the adhesive, It is preferable that the elastic stretchable member is not provided on the sheet member constituting both left and right side portions of the front portion 1 and the back side portion 2 of the body by an adhesive.

As described above, if there is an adhesive such as a hot-melt adhesive on the portion to be formed by the main bonding region 40 and the sub-bonding region 50, the main bonding region 40 is formed by a heat sealing technique using a heater seal or an ultrasonic seal, The heat generated by the heater seal or the ultrasonic seal is used to melt the hot-melt adhesive. In this case, the thermoplastic sheet to be bonded can not be heated sufficiently, so that the bonding strength is not stabilized or the adhesive property is developed by the melted hot-melt adhesive, or the embossing pattern of the bonding portion is solidified by solidification in the state of being disturbed. For this reason, regarding the bonding in the side seal portion, it can be said that it is preferable not to apply the hot-melt adhesive to the bonding portion. However, if the hot-melt adhesive is not applied to the side-seal portion, there is a problem that the cover sheet of the front portion of the body and the cover sheet of the back portion of the body are opened from the left and right sides of the diaper. Therefore, in order to solve this problem at the same time, in the preferred embodiment of the present invention, the hot-melt adhesive is not applied to the area where the side seal part is to be formed, and not only the main bonding area 40, The region 50 is formed to prevent the cover sheet of the body front portion and the cover sheet of the rear portion of the body from being opened so that the both side portions of the disposable diaper can be stably and stably bonded.

In the pull-on disposable diaper according to the present invention, at least two or more of the plurality of sub-embossed portions 51 formed in the sub-joint region 50 are provided on both the left and right ends of the body front portion 1 and the back body portion 2 4a.

The plurality of embossed portions 51 reach the end edges 4a on both the left and right sides of the trunk front portion 1 and the rear portion 2 of the body so that the cover sheet of the front portion of the trunk and the body The cover sheet of the rear portion can be prevented from being opened.

In the pants-type disposable diaper of the present invention, the main bonding region 40 is preferably an area formed by providing a plurality of embossing rows in which a plurality of main embossing portions 41 are arranged in parallel with each other in the vertical direction. Likewise, it is preferable that the sub-junction region 50 is an area formed by providing a plurality of embossing rows in which a plurality of sub-embossing portions 51 are arranged in parallel with each other in the vertical direction. In this case, it is preferable that the bonding strength of the non-bonding region 50 is 30% or less with respect to the bonding strength of the main bonding region 40.

The main bonding region 40 and the sub bonding region 50 are formed by a plurality of embossing lines spaced apart in the left and right direction and the bonding strength in the sub bonding region 50 It is possible to effectively prevent the cover sheet of the body front surface portion and the cover sheet of the rear surface portion of the body from being opened and the diaper tactile sensation to be damaged.

The main bonding region 40 is a bonding portion for giving a necessary bonding strength to both side portions and the sub bonding region 50 is a bonding portion for preventing the outside of the main bonding region 40 from being opened. Therefore, it is preferable that the bonding strength between the main bonding region 40 and the non-bonding region 50 has a large difference as described above. That is, when there is not a large difference in the bonding strength between the main bonding region 40 and the non-bonding region 50, a large force is required to tear the side sealing portion 4. Then it becomes a stress of the user and it shakes the wearer with the moment of tearing, and it causes discomfort to the wearer.

In the pants-type disposable diaper of the present invention, it is preferable that the main bonding region 40 is formed on both left and right sides of the pull-on type disposable diaper over the entire length in the up-and-down direction. The length of the sub-junction region 50 in the up-and-down direction is preferably shorter than the length of the main junction region 40 in the up-down direction. Further, it is preferable that the non-joined region 50 is offset and disposed at a position that does not coincide with the upper and lower ends of the diaper. In this case, the length in the up-and-down direction indicates the distance between the outermost edges of the embossed patterns located at the outermost position.

In the position of the sub-joint region 50, since the joint portion is not exposed at the upper or lower end of the diaper, it is possible to avoid a discomfort to the wearer due to the contact of the hard joint portion with the skin. On the other hand, the main joint region 40 should be formed over the entire length of the diaper in the up and down direction, since it is necessary to reduce the strength of the diaper around the waist portion when worn and worn.

A second aspect of the present invention relates to a method of manufacturing a pull-on type disposable diaper. The pull-on type disposable diaper includes a body front portion 1 abutting on the wearer's abdomen, a body back portion 2 abutting on the back of the wearer, and a crotch portion 3 located between the body front portion 1 and the body back portion 2 ).

A method for producing a disposable diaper according to the present invention includes the steps of obtaining a diaper continuum in which a plurality of disposable diapers are juxtaposed in the left and right direction and a step of folding back the diaper continuation body at the crotch part 3 to superimpose the body front part 1 and the body back part 2 A joining step of forming left and right side portions of the body front portion 1 and side and side portions of the body rear portion 2 by heat sealing and bonding by a heater seal or an ultrasonic seal; And a cutting step of cutting the individual pants-type disposable diaper in a vertical direction at a position corresponding to an end edge (4a) on both left and right sides of the trunk front part (1) and the back body part (2).

The side seal portion 4 formed in the bonding step has a main bonding region 40 extending in the up and down direction and a sub bonding region 50 located outside the main bonding region 40 in the left and right direction and extending in the up and down direction: Lt; / RTI >

The auxiliary bonding region 50 is an area formed by providing one or more rows of embossing lines in which a plurality of sub-embossing portions 51 are arranged in parallel with each other in the vertical direction. The bonding strength of the sub- (40).

Then, in the cutting step, the diaper continuum is cut in the vertical direction at the boundary positions of the two sets of the non-joined regions 50.

According to the above process, the pull-on type disposable diaper according to the first aspect of the present invention can be continuously and efficiently manufactured.

Disclosure of Invention The present invention can provide a pull-on disposable diaper having a good appearance of the side seal portion formed on both left and right sides of the diaper and having a good feel on the side seal portion.

1 is an external perspective view showing an example of a disposable diaper according to the present invention.
2 is a developed view showing an example of a disposable diaper according to the present invention.
3 is a view showing an example of a bonding pattern of the side seal portion.
4 is a view for explaining a bonding pattern of the side seal portion. 4 (a) is a sectional view of the disposable diaper of Y1-Y1 in Fig. 2. Fig. 4 (b) is a sectional view of the disposable diaper of Y2-Y2 in Fig. 2. Fig. 4 (c) is an enlarged plan view showing the side seal portion.
5 is an enlarged view showing a bonding pattern of the main bonding region included in the side seal portion.
6 is an enlarged view of the main bonding region and the sub bonding region included in the side seal portion.
7 is a flowchart showing an example of a method of manufacturing a disposable diaper.
Fig. 8 shows another example of the bonding pattern of the side seal portion.
Fig. 9 shows another example of the bonding pattern of 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 examples described below, but includes those appropriately modified to the extent that a person skilled in the art can easily understand the following embodiments.

In this specification, the term " vertical direction " refers to a vertical direction of the pants type disposable diaper in a state in which both the front and rear portions of the torso are joined to each other in the vertical direction Quot; direction "). In the case of "left and right", it means the circumferential direction (the direction indicated by the arrow X in FIG. 1 and the like) of the disposable diaper in a state in which the both front and back portions of the body are joined.

In the present specification, "A to B" means "A to B ".

 (1. Overall configuration of disposable diaper)

The present invention can be widely applied to a known one as long as it is a pants-type disposable diaper. The disposable diaper of pants type is a disposable diaper of a type in which both side portions of the body front portion and the back side of the body are previously joined. For example, the pull-on type disposable diaper may be of a type having a structure in which the absorbent main body is bridged between the outer surface of the front surface of the body and the back surface of the body. The pants-type disposable diaper may also be of a type in which the absorbent main body is fixed around the crotch part to an external body integrally formed from the body front part to the back side of the body. Hereinafter, the disposable diaper according to the present invention will be described with reference to a pants-type disposable diaper of a pant-type disposable diaper of a type in which the body front-face outer body and the back body of the body are provided in different bodies, Will be described in detail.

Fig. 1 is a perspective view showing an example of the disposable diaper 100 on the body front side. 2 is an exploded view showing an example of the disposable diaper 100 and shows a state in which the disposable diaper 100 is seen from the side of the skin contacting face. As shown in the developed view of Fig. 2, the disposable diaper 100 is provided with a body front portion 1 which is in contact with the abdomen of the wearer when it is mounted, a body rear portion 2 which is in contact with the back portion of the wearer, And a crotch part (3) where the crotch part is divided. In the present embodiment, the disposable diaper 100 is provided with the trunk front face external body 1a on the trunk front portion 1 and the trunk back face external body 2a on the trunk rear portion 2. The absorbent main body 3a is bridged to the crotch part 3 between the body front-side outer body 1a and the body rear-side outer body 2a. That is, in the present embodiment, the absorbent main body 3a is fixed at one end side in the longitudinal direction to the body front face side external body 1a, and the other end side in the longitudinal direction is fixed to the body back side external body 2a have.

2, the left and right ends of the trunk front-face outer body 1a and the rear-body outer body 2a of the body are joined together in a superimposed state. A pair of right and left side seal portions 4 are formed at this joint portion. In the pair of side seal portions 4, both end portions of the body front-face outer body 1a and the both end portions of the body rear face portion outer body 2a are joined and joined to form a state shown in Fig. 1 . As shown in Fig. 1, the waist opening 5 is formed by the upper edge of the trunk front face outer body 1a and the upper edge of the body rear face portion outer body 2a. Further, the body side front portion outer body 1a and the body rear side portion body 2a are joined together at the side seal portion 4, thereby forming the perimeter opening portion 6 positioned around the leg portion of the wearer. Therefore, the wearer can mount the disposable diaper 100 which inserts the leg portions at the waist opening 5 and releases the leg portions at the peripheries opening 6.

As shown in Figs. 1 and 2, the pair of side seal portions 4 has a main bonding region 40 and a sub bonding region 50. As shown in Fig. The main joint region 40 is intended to fix both the left and right ends of the body front and front body external portions 1a and 2a to each other and extends vertically to form a body front face external body 1a And the body rear face portion outer body 2a are joined to each other. On the other hand, the non-joined region 50 is formed outside the main bonded region 40 in the lateral direction. The auxiliary joint region 50 is basically formed so as to prevent the left and right edges of the body front and rear body portions 1a and 2a from being opened for a long distance, And the external body 1a and the body rear face portion external body 2a are lightly joined. That is, the bonding strength of the non-bonding region 50 is set to be at least weaker than the bonding strength of the main bonding region 40.

 (2. External body of the body front and rear body of the body)

Next, the configuration of each part of the disposable diaper 100 will be described.

As shown in Figs. 1 and 2, when the disposable diaper 100 is worn, the trunk front and back outer body 1a and the back body of the trunk 2a are made of the trunk front outer sheath 1a, (3a) positioned between the absorbent main body (2a). The trunk frontal outer body 1a is a member in contact with the abdomen of the wearer at the time of wearing, and the back body of the torso 2a is a member in contact with the back portion of the wearer when worn.

Further, the body front-side outer body 1a and the body rear-side outer body 2a are joined to each other at both side ends in the lateral direction, and a pair of side seal portions 4 are formed at the joint portion. Fig. 3 is an enlarged view of the bonding pattern of the side seal portion 4. Fig. 3, the side seal portion 4 includes a main bonding region 40 extending in the vertical direction from the upper end to the lower end in both left and right side portions of the trunk front and back outer bodies 1a and 2a, Bonded region 50 joining the left and right side portions of the body front-side external body 1a and the body rear-side external body 2a to the outside of the main junction region 40 in the lateral direction. In the present embodiment, the main bonding region 40 and the sub-bonding region 50 are formed by collecting a plurality of embossing portions (main embossing portion 41 embossing portions 51). Here, the embossing portion (main embossing portion 41, sub embossing portion 51) means one of the bonding points. The main bonding region 40 is a band-shaped region extending in the vertical direction from the inner edge of the innermost one of the plurality of main embossing sections 41 to the outer edge of the outermost one of the plurality of main embossing sections 41, the width being the width. Likewise, the sub-joined region 50 is a region of the innermost portion of the plurality of sub-embossed portions 51 that extends from the inner edge of the innermost portion to the outer edge of the outermost portion of the sub- Area. As shown in FIG. 3, the main bonding region 40 and the sub bonding region 50 are formed by arranging a plurality of main embossing portions 41 and a plurality of sub-embossing portions 51 in a regular pattern. A detailed description of the main bonding region 40 and the auxiliary bonding region 50 will be described later.

4 (a) is a cross-sectional view showing a state in which the disposable diaper shown in Fig. 2 is cut along the Y1-Y1 line segment in Fig. 2 in the longitudinal direction of the disposable diaper. Fig. 4 (b) is a cross-sectional view showing a state in which the disposable diaper shown in Fig. 2 is cut along the line segment Y2-Y2 in Fig. 2 in the longitudinal direction of the disposable diaper. Although various sheet materials are originally thin, they are structured to have a conceptual thickness in order to facilitate the explanation in FIGS. 4 (a) and 4 (b).

The trunk front face outer body 1a and the body rear face outer body 2a each have an outer sheet 10 on the side facing the skin and an inner sheet 12 on the side facing the skin. The outer sheet 10 and the inner sheet 12 are formed of, for example, a flexible fibrous nonwoven fabric or a plastic sheet. The fibrous nonwoven fabric or the plastic sheet is adhered, for example, by a hot-melt adhesive. It is preferable that no hot melt adhesive for joining the outer sheet 10 and the inner sheet 12 is present at a portion where the main bonding region 40 and the auxiliary bonding region 50 are to be formed. If there is a hot-melt adhesive on a portion where the main bonding region 40 and the sub-bonding region 50 are to be formed, the main bonding region 40 and the sub-bonding region 50 are formed by a heat seal technique using a heater seal or an ultrasonic seal The heat generated by the heater seal or the ultrasonic seal is used to melt the hot melt adhesive. As a result, the thermoplastic sheet to be bonded can not be heated sufficiently, so that the bonding strength is not stabilized, or there is a problem that the melted hot-melt adhesive exhibits tackiness at the bonded portion or the hot-melt adhesive becomes hard and hard. Therefore, it is preferable not to apply the hot-melt adhesive to the joint portion where the side seal portion 4 is formed.

A plurality of waist elastic members 20 are arranged in a stretched state along the rim of the waist circumference of the trunk front face outer body 1a and the body rear face outer body 2a. Some of the plurality of waist elastic members 20 are joined to the trunk front outer body 1a and the back body outer body 2a in a stretched state and form a waist gather by contraction. A dummy stretchable material 21 is disposed on the lower side (crotch side) of the plural waist elastic members 20. The dummy stretchable material 21 is fixed in a stretched state between the outer sheet 10 and the inner sheet 12 and the dummy stretchable material 21 is contracted to form dummy wrinkles around the abdomen of the disposable diaper.

As shown in Figs. 4 (a) and 4 (b), the outer body 1a of the torso front portion and the outer body 2a of the torso back portion are provided with the outer sheet 10 on the outermost layer on the side facing the skin. The outer sheet 10 is folded back to the side where the upper sheet 10 is in contact with the skin at the fold line 11a and the folded back portion 11 is folded back, . The folded line 11a folded back to the outer sheet 10 corresponds to the upper ends of the trunk front face outer body 1a and the rear face body outer body 2a of the body and when the disposable diaper is made, (5). The folded back portion 11 of the outer sheet 10 extends in the vertical direction to a length that does not reach, for example, the position where the dummy stretchable member 21 is disposed.

As shown in Figs. 4 (a) and 4 (b), a plurality of waist elastic members 20 and a plurality of dummy elastic members (not shown) are formed on the outer sheet 10 at the body front- 21 are folded back and arranged in a stretched state in the direction along the broken line 11a. The number of waist elastic members 20 may be two or more, and may be, for example, two to fifteen, four to twelve, or six to nine. A plurality of dummy stretchable members 21 are provided on the outer sheet 10 below the waist elastic member 20. The number of the dummy elastic members 21 may be, for example, 10 to 30, 15 to 25, or 18 to 20. A plurality of waist stretchable members 20 and a plurality of dummy stretchable members 21 are arranged substantially parallel to each other at predetermined intervals in the longitudinal direction of the disposable diaper as shown in Figs. 4 (a) and 4 (b). 2, a plurality of waist elastic members 20 and a plurality of dummy elastic members 21 are fixed to the body front and back outer bodies 1a and 2a in the stretched state, To the side seal portions 4 located at both left and right ends of the side seal portion 4. The plurality of waist elastic members 20 and the plurality of dummy elastic members 21 may be fixed by applying or spraying a highly fluid adhesive such as a hot melt adhesive. However, it is preferable that a plurality of waist elastic members 20 and a plurality of dummy elastic members 21 are not present at a portion to be joined by the side seal portion 4. If the waist elastic member 20 and the dummy elastic member 21 are present on the side seal portion 4, the side seal portion 4 is provided with the left and right side portions of the torso front outer portion 1a and the torso rear portion outer portion 2a The heat generated by the heat seal or the ultrasonic seal is used for melting various elastic elastic members and the joints of the body front and rear external bodies 1a and 2a are not stable It is not.

4 (a) and (b), a cushion-forming sheet 13 is provided between a folded back portion 11 formed by retracting the outer sheet 10 and a plurality of waist elastic members 20, Is preferably disposed. The cushion-forming sheet 13 is a sheet material arranged for the purpose of enhancing the waistline cushioning and flexibility. 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. The cushion-forming sheet 13 is folded back toward the inward surface of the folded portion 11 (the surface facing the skin) of the folded portion 11 and intermittently joined in the direction along the folded line 11a desirable. "Intermittently bonded" means that the joint and non-joint are continuous at a constant interval. The cushion forming sheet 13 and the folded back portion 11 are folded back and intermittently joined in the direction along the folded line 11a so that when the waist elastic member 20 and the dummy stretchable member 21 contract, A space is formed between the forming sheet 13 and the folded portion 11, and the waist flap cushioning and flexibility can be improved through this space. The upper end of the cushion-forming sheet 13 extends to the position of the fold line 11a of the outer sheet 10 and the cushion-forming sheet 13 13 are partially overlapped on the side of the inner sheet 12 where the skin contacts. However, the cushion-forming sheet 13 does not have a length reaching the lower end of the inner sheet 12.

Disposable diapers having such a cushion-forming sheet 13 are disclosed in Japanese Patent Application Laid-Open No. 2011-254996.

As shown in Figs. 4 (a) and 4 (b), the inner sheet 12 is positioned on the side of the outer sheet 10 which faces the skin. The inner sheet 12 fixes a part of a plurality of waist stretchable members 20 and a plurality of dummy stretchable members 21 between the outer sheets 10. The inner sheet 12 does not reach the upper edge of the outer sheet 10, but is formed to reach the lower edge of the outer sheet 10. The upper portion of the inner sheet 12 may be partially overlapped with the cushion-forming sheet 13. The upper portion of the inner sheet 12 may be partially overlapped with the folded portion 11 of the cushion-forming sheet 13 and the outer sheet 10.

As described above, the trunk front-side outer body 1a and the rear-side body portion 2a of the torso are constructed by overlapping a plurality of sheet materials. For example, in the present embodiment, in the first laminated portion 71, which is the uppermost portion of the trunk front outer portion 1a and the trunk rear outer portion 2a, the outer sheet 10, the cushion The sheet 13 and the folded back portion 11 of the outer sheet 10 are triple-overlapped. The outer sheet 10, the inner sheet 12, the cushion-forming sheet 13 and the outer sheet 10 (hereinafter, referred to as " outer sheet 10 " Folded portions 11 are folded in four.

The outer sheet 10, the inner sheet 12, and the cushion-forming sheet 13 are sequentially stacked on the third laminate portion 73 located at the lower portion of the second laminate portion 72, They are superimposed on each other. The outer sheet 10 and the inner sheet 12 are arranged in order from the side where the skin is abutted against each other in the order of 2 They are superimposed on each other. As described above, the score of the sheet material superimposed on the side seal portion 4 of the trunk front outer sheave 1a and the back body outer sheath 2a may be different depending on the region.

As described above, the body front face portion outer body 1a and the body back face portion outer body 2a, which are formed by stacking a plurality of sheet materials, are joined at a pair of side seal portions 4 located at left and right ends. That is, both the left and right side portions of the trunk front-side outer body 1a and the rear-side body portion 2a of the trunk are joined together in a state of being superimposed on each other, and the trunk front-side outer body 1a and the rear- A pair of side seal portions 4 are formed. For example, a heater seal or an ultrasonic seal is preferably used as a method of joining the body front-face outer body 1a and the body rear-face outer body 2a.

 (2-1 main bonding region)

Here, the main bonding region 40 included in the side seal portion 4 will be described in detail.

Fig. 4 (c) is an enlarged plan view showing one end portion of the trunk front-side outer body 1a and the rear portion of the trunk-side body 2a joined by the side seal portion 4. Fig. Sectional view of Fig. 4 (a), a sectional view of Fig. 4 (b), and a plan view of Fig. 4 (c) Particularly, FIG. 4 (c) shows an embodiment of the bonding pattern of the main bonding region 40 in the side seal portion 4. The bonding pattern of the main bonding region 40 is not limited to that shown in Fig. 4 (c).

As shown in Fig. 4 (c), the main bonding region 40 extending linearly in the up-and-down direction of the diaper has an upper bonding region 40a located at the upper portion and a lower bonding region 40b located at the lower portion . In FIG. 4 (c), the upper bonding region 40a and the lower bonding region 40b are separated by a dotted line extending in the 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. 4 (c) May be formed longer than the junction region 40b, or vice versa. Referring to Figs. 4 (a), 4 (b) and 4 (c), the upper joining region 40a and the lower joining region 40b have different numbers of laminated sheet members. That is, the number of laminated sheet members joining the lower joining region 40b is increased in the upper joining region 40a. For example, in the embodiment shown in FIG. 4, the upper bonding region 40a is formed by laminating the body front-face outer body 1a and the body rear-face outer body 2a to the first lamination portion 71, (72) and the third lamination portion (73). Therefore, when the number of the sheet materials constituting the trunk front-side outer body 1a and the back-side body 2a of the trunk are combined, the upper joining region 40a overlaps and joins 6 or 8 sheets of sheet material. In the embodiment shown in Fig. 4, the lower junction region 40b is joined to the fourth stacking portion 74 with the trunk front-side outer body 1a and the rear-side body portion 2a. Therefore, when the number of the sheet members constituting the trunk front-side outer body 1a and the back-side body 2a of the trunk portion is the same, the lower joining region 40b joins and joins the four sheet members.

However, in the main bonding region 40, the number of sheet members to be bonded by the upper bonding region 40a and the lower bonding region 40b is not limited to the above-described one. That is, the upper bonding region 40a may be formed by stacking the uppermost bonding region 40a and the lower bonding region 40b at a position above the lower bonding region 40b, It is preferable that the sheet members of the number equal to or smaller than that of the upper joining region 40a are stacked and joined.

The upper bonding region 40a is a region where a plurality of upper embossments 41a are formed and the lower bonding region 40b is a region where a plurality of lower embossments 41b are formed to be. 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. 4 (c), the upper embossing portion 41a is formed in three rows. The distance from the left end column to the right end column of the plurality of rows of the upper embossing portion 41a is the width of the upper joining region 40a. Likewise, a plurality of lower embossments 41b are formed in the lower junction area 40b in a plurality of rows along the vertical direction of the diaper. In the example shown in Fig. 4 (c), the lower embossing portion 41b is formed in three rows. The distance from the left end column to the right end column of the plurality of rows of the lower embossing portion 41b is the width of the lower junction region 40b. The number of rows of the upper embossing portion 41a and the lower embossing portion 41b forming the upper joining region 40a and the lower joining region 40b is preferably a plurality of rows. For example, it may be four rows to ten columns. The heat of the upper embossing portion 41a and the heat of the lower embossing portion 41b may be different from each other.

Here, as shown in Fig. 4 (c), the width B1 of the lower junction area 40b is wider than the width Bu of the upper junction area 40a in the left and right direction of the diaper so as to have a wide width (Bl> Bc) . For example, the width Bl of the lower junction region 40b may be in the range of 105% to 150%, 110% to 145%, 115% to 140%, or 120% to 135% of the width Bu of the upper junction region 40a. . In particular, it is preferable that the lower junction region 40b is wider on both the left and right sides of the diaper relative to the upper junction region 40a. For example, when the width Bu of the upper bonding 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 bonding region 40b is 3 mm to 30 mm, Or 6 mm to 15 mm. By making the width B1 of the lower junction region 40b larger than the width Bu of the upper junction region 40a as described above, it is possible to improve the bonding strength of the lower junction region 40b in which the number of sheets to be joined is small, It is possible to improve the balance with the bonding strength of the upper bonding region 40a having a large number of the bonding regions 40a. Therefore, the hardness of the upper bonding region 40a and the lower bonding region 40b is made uniform, and as a result, the feeling of the entire side sealing portion 4 (in particular, the entirety of the main bonding region 40 is improved. The number of sheets to be joined is small, so there is a possibility that the joining portion may be easily peeled off when the diaper is worn. However, by widening the width of the lower joining region 40b, the bonding strength is improved and peeling at the time of wearing the diaper is prevented. The width of the lower bonding region 40b is widened so that the bonding strength can be improved without enlarging the area of the lower embossing portion 41b itself. This makes it easier to break the side seal portion 4 in the disposal of the diaper.

The bonding pattern in the main bonding region 40 will be described in more detail.

Fig. 5 is an enlarged view showing an enlarged portion of a broken-line frame shown in Fig. 4 (c). Fig. 5 shows the arrangement relationship of a plurality of upper embossments 41a and a plurality of lower embossments 41b. As shown in FIG. 4, the upper embossing portion 41a and the lower embossing portion 41b are formed in three rows, and the center rows of the upper embossing portion 41a and the lower embossing portion 41b are located on the same straight line. On the other hand, the row of the left end of the lower embossing portion 41b and the row of the right end of the lower embossing portion 41b are formed at a position diffused from the left end of the upper embossing portion 41a to the left end of the diaper. Thus, the width Bl of the lower junction region 40b becomes wider than that of the upper junction region 40a.

As shown in FIG. 5, it is preferable that each upper embossing portion 41a and each lower embossing portion 41b is formed as a short line extending in the left-right direction of the diaper. The upper embossing portion 41a of the "short line?" Means that at least the length Lu in the left-right direction of the upper embossing portion 41a is longer than the width Wu in the up-down direction of the upper embossing portion 41a, Value is less than or equal to half of the width Bu value of the upper junction region 40a. Likewise, the "bottom-line embossed portion 41b" of the "single-line" is defined as the length Ll in the left-right direction of at least the lower embossing portion 41b is longer than the width Wl in the vertical direction of the lower embossing portion 41b, Half or less of the width Bl of the lower junction region 40b. Thus, by forming the upper embossed portion 41a and the lower embossed portion 41b in a line shape, it is easy to break the side seal portion 4 (particularly the main bonding region 40) at the time of disposing of the diaper. That is, since the upper embossed portion 41a and the lower embossed portion 41b extend in the left-right direction of the diaper, the force at the time of breaking the diaper can be led to the outside of the diaper. Therefore, by making the upper embossed portion 41a and the lower embossed portion 41b a single line, it is easy to break the side seal portion 4 by a series of operations when the wearer gives a force to break the diaper.

It is preferable that the joint areas of the upper embossments 41a and the lower embossments 41b are the same. The length Lu of the upper embossing portion 41a is equal to the length L1 of the lower embossing portion 41b and the width Wu of the upper embossing portion 41a is equal to the width Wu of the lower embossing portion 41b . 5, the length Lu of the upper embossing portion 41a and the length L1 of the lower embossing portion 41b are both preferably 0.5 mm to 10 mm, 1 mm to 5 mm, or 1.5 mm to 3 mm, for example Do. It is preferable that the width Wu of the upper embossing portion 41a and the width Wl of the lower embossing portion 41b are both 0.2 mm to 5 mm or 0.4 mm to 3 mm. In this embodiment, as described above, the bonding strength of the lower bonding region 40b can be secured by enlarging the width Bl of the lower bonding region 40b. Even if the bonding area of the lower embossed portion 41b forming the lower bonded region 40b is equal to the bonding area of the upper embossed portion 41a forming the upper bonded region 40a, ) Can be ensured. Further, by making the bonding area of the lower embossing portion 41b and the bonding area of the upper embossing portion 41a the same, it is easy to break the upper bonding region 40a and the lower bonding region 40b by a series of operations at the time of disposing of the diaper Loses.

In FIG. 5, Su designates the interval in the left-right direction of the row of adjacent upper embossments 41a in the upper joining region 40a. As shown in Fig. 5, it is preferable that the intervals Su in the left-right direction of the adjacent rows of the upper embossments 41a are the same. Especially, the interval Su in the left-right direction of the row of the adjacent upper embossing portions 41a is preferably equal to the length Lu of the upper embossing portion 41a (Su = Lu).

And also shows the interval in the left-right direction of the row of the adjacent lower embossed portion 41b in the junction area 40b under the symbol S1. As shown in Fig. 5, the intervals S1 in the left-right direction of the rows of the adjacent lower embossments 41b are preferably the same.

Further, when the row spacing Su of the upper embossing portion 41a is compared with the row spacing Sl of the lower embossing portion 41b, the value of the interval Sl is preferably larger than the value of the interval Su (S1> Su). For example, the value of the interval S1 of the lower embossing portion 41b is 110% to 200%, 120% to 180%, or 130% to 160%, and is 140% or more of the column spacing Su of the upper embossing portion 41a. To 150%. As described above, according to the present invention, the width S1 of the lower embossed portion 41b is made wider than the row spacing Su of the upper embossed portion 41a, Width of width Bu.

5, the width B1 of the lower junction region 40b is wider than the width Bu of the upper junction region 40a, so that the number of the plurality of the junction regions 40b located in the outermost row in the lateral direction in the lower junction region 40b In the lower junction region 40b, a protruding portion O projecting outward in the lateral direction than the width of the upper junction region 40a is formed. In Fig. 5, the projected portion O is shown by oblique lines. It is preferable that the protruding portions O are formed in the lower junction regions 40b located in the outermost rows in both right and left directions. For example, the length of the projecting 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, reference character Pu denotes the interval in the vertical direction of the plurality of upper embossments 41a in any column. As shown in FIG. 5, it is preferable that the upper and lower spacings Pu of the upper embossing portion 41a are all the same.

In addition, the reference numeral P1 denotes an interval in the vertical direction of the plurality of lower embossments 41b in any column. As shown in Fig. 5, it is preferable that the intervals P1 in the vertical direction of the lower embossments 41b are all the same.

When the distance Pu between the upper embossing portion 41a and the lower embossing portion 41b is compared with the distance Pl between the upper embossing portion 41a and the lower embossing portion 41b, . For example, the upper and lower embossments 41b may have a spacing Pl of 50% to 95%, 55% to 90%, or 60% to 85% of the upper embossments 41a, , And it is preferably 65% to 80%. As described above, by making the distance Pl in the vertical direction of the lower embossing portion 41b narrower than the distance Pu in the vertical direction of the upper embossing portion 41a, it is possible to improve the bonding strength of the lower bonding region 40b, It is possible to improve balance with the bonding strength of the upper bonded region 40a having a large number of sheets to be bonded. Therefore, the hardness of the upper bonding region 40a and the lower bonding region 40b is made uniform, and consequently, the overall feeling of the side sealing portion 4 is improved.

As shown in Fig. 5, in the upper joining region 40a, the adjacent rows of the upper embossing portions 41a are desirably shifted from each other in the vertical direction of the diaper. In FIG. 5, reference symbol Du denotes a displacement distance between a row of the upper embossing portion 41a located on both the left and right sides and a row of the upper embossing portion 41a located at the center. For example, it is preferable that the shift distance Du of the upper embossed portion 41a is about half of the vertical distance Pu between the upper embossments 41a in any row.

Likewise, in the lower junction area 40b, the rows of the adjacent lower embossments 41b are desirably shifted from each other in the vertical direction of the diaper. In Fig. 5, reference symbol D1 denotes a distance between the heat of the lower embossing portion 41b located at the right and left ends and the heat of the lower embossing portion 41b located at the center. For example, it is preferable that the displacement distance Dl of the row of the lower embossing portions 41b is about half of the interval Pl between the upper and lower direction of the plurality of lower embossments 41b in any row.

A plurality of main embossing portions 41 are arranged at intervals in the vertical direction with respect to the bonding pattern in the main bonding region 40 to form a plurality of rows and the plurality of rows are formed with intervals in the left- I explained the pattern as an example. However, the bonding pattern of the main bonding region 40 is not limited to the above embodiment. For example, in the main bonding region 40, the bonding pattern may be a straight line extending in the vertical direction. Further, the main embossing portion 41 forming the main bonding region 40 may have a longitudinal shape parallel to the side edge of the diaper. The main embossing portion 41 may have a slope of about 1 to 45 degrees or about 2 to 30 degrees with respect to the side edge of the diaper. As the main embossing portion 41 has an inclination, the line pressure can be increased, which is advantageous when it is desired to maintain or stabilize the bonding strength.

 (2-2 joint region)

Next, the non-bonded 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 dashed line shown in Fig. That is, the enlarged view shown in FIG. 6 shows the upper portion of the main bonding region 40 and the upper portion of the non-bonding region 50.

As shown in FIG. 6, the side seal portion 4 includes a main bonding region 40 and a sub bonding region 50. In this embodiment, as described above, the main bonding region 40 is a band-shaped region in which a plurality of main embossing portions 41 are vertically arranged and spaced apart in the left-right direction. In addition, as shown in Fig. 6, a margin S exists between the outer edge of the main bonding region 40 and the edge 4a on both the left and right sides of the trunk front face exterior body and the trunk rear face exterior body. By providing the margins S between the main bonding region 40 and the edge 4a as described above, the main bonding region 40, which is hard to touch, is exposed to the edge 4a to prevent direct contact with the wearer's skin can do. In addition, a pull-on diaper is generally obtained by laminating a plurality of continuous sheet materials, joining them by a pair of main bonded regions 40, and cutting them therebetween to obtain an individual pull-on diaper. Therefore, if there is not too much space between the main bonding regions 40, there is a possibility that the main bonding regions 40 are not cut off at the time of cutting, and the main bonding regions 40 may be cut off. Then, the deviation of the bonding strength of the main bonding region 40 becomes large. Thus, by providing the margins S between the main bonding region 40 and the end frame 4a as described above, the continuous sheet member can be cut more reliably between the pair of main bonding regions 40 in a pair. From this viewpoint, it is preferable that the length of the margin S in the lateral 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 bonding region 40 and the edge 4a, the left and right ends of the trunk front-face outer body and the back face-side outer body are opened to each other, and the overall appearance of the diaper is likely to become worse . Therefore, in the present invention, the auxiliary joint region 50 is formed in the margin S portion existing between the main joint region 40 and the end edge 4a, and the marginal area S is lightly joined so as not to hurt the feel of the diaper Thereby preventing the left and right ends of the body front and rear body portions from being opened.

The joining of the sub-joined region 50 is not intended to fix the left and right ends of the outer body of the body front face portion and the outer face of the rear body portion of the body at the time of wearing so as not to peel off, And to lightly adhere to such an extent that both end portions are not opened. Therefore, the bonding strength in the non-bonding region 50 is set to be lower than the bonding strength of the main bonding region 40. [ For example, the bonding strength of the non-bonding region 50 is preferably 50% or less, more preferably 30% or less, more preferably 15% or less, when the bonding strength of the main bonding region 40 is 100% desirable. For example, the bonding strength of the non-bonding region 50 may be 1% to 50%, 1% to 30%, or 1% to 15% with respect to the bonding strength of the main bonding region 40.

The pull-on type disposable diaper is designed to be able to tear open and expand either or both of the left and right side portions when removing it. In order to reproduce this operation, the "bonding strength" is determined by pulling the main bonding region 40 and the non-bonding region 50 in the direction of 180 degrees from the inside of the diaper using a tensile strength tester, do.

That is, in the present specification, the term "bond strength" means a tensile strength measured by the following method.

First, regions including the main bonding region 40 and the non-bonding region 50, which are the measurement targets of the bonding strength, were cut out in predetermined shapes (left and right directions: 25 mm.times.vertical direction: 30 mm) . Next, the main bonded area test piece is set in a tensile strength tester (trade name: Stroog V1-B, manufactured by Toyo Seiki Seisakusho Co., Ltd.). A set of main joint area test specimens is made by expanding the main joint area test specimen left and right around the main joint area 40 and fixing the developed both ends by chucking them up and down. At this time, the distance between the right and left chucks is set to 20 mm. In this state, the tensile strength is measured by operating the tensile tester and pulling the test specimen in the left and right directions. At this time, the tensile speed was set at 200 mm / min, and the measurement was terminated at the point when the test specimen of the main bonded area was broken. The maximum tensile strength is confirmed in the obtained measurement chart. This maximum tensile strength is referred to herein as "bond strength ". The bonded region 50 is obtained by peeling the bonding portion of the main bonded region 40 to the region of S2 in Fig. 6 in advance and measuring the "bonding strength" in the same manner as the bonding strength of the main bonding region 40 can do.

More specifically, the bonding strength of the main bonding region 40 is preferably 5.0 N / 25 mm or more. For example, the bonding strength of 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 is so low that the main bonding region 40 is peeled off and the entire diaper is broken when the side edge of the diaper is gripped when the diaper is worn There is a concern. On the other hand, when the bonding strength of the main bonding region 40 exceeds 30.0 N / 25 mm, there is a concern that the bonding portion touches the skin and feel pain. Further, in order to easily peel off the pants-type diaper from the wearer, it is necessary to pull the side edge of the diaper by pulling. However, if the bonding strength of the main bonding region 40 exceeds 30.0 N / 25 mm, .

On the other hand, it is preferable that the bonding strength of the non-bonding region 50 is 50% or less, 30% or 15% or less with respect to the bonding strength of the main bonding region 40. For example, the bonding strength of the non-bonded region 50 is preferably 0.75 N / 25 mm to 15.0 N / 25 mm. If the bonding strength of the non-bonding region 50 is less than 0.75 N / 25 mm, the bonding strength is too low, and the non-bonding region 50 easily peels off according to the operation of the wearer, . On the other hand, if the bonding strength of the non-bonding region 50 exceeds 15.0 N / 25 mm, the bonding width of the main bonding region 40 and the non-bonding region 50 is long and a force for breaking is required. When the bonding strength of the non-bonding area 50 is more than 15.0 N / 25 mm, the touch of the non-bonding area 50 becomes hard and may cause pain when touching the skin of the wearer.

As described above, various methods can be considered as a method of setting the bonding strength of the sub-bonding region 50 to be lower than the bonding strength of the main bonding region 40. [

It is necessary to set the bonding area of the auxiliary bonding area 50 to be narrower than the bonding area of the main bonding area 40 or the bonding area of the auxiliary bonding area 50 The lengths of the plurality of sub-embossing parts 51 arranged in the vertical direction in the main bonded area 50 are made shorter than those in the main bonded area 40 or the lengths of the respective sub-embossed parts 51 To be shallower than the depth of each main embossing portion 41 of the main bonding region 40. [ Next, an example of a method of weakening the bonding strength of the non-bonding region 50 is described, but the non-bonding region 50 of the present invention is not limited thereto.

Regarding the above (A), in order to set the bonding strength of the non-bonding region 50 to be weak, the bonding area of the non-bonding region 50 may be made narrower than the bonding area of the main bonding region 40. That is, even if the area of each of the sub-embossed portions 51 provided in the sub-bonded region 50 is the same as the area of the main embossed portion 41 provided in the main bonded region 40, By making the gap between the directional gap and the lateral direction wider than the embossed pattern of the main junction region 40, the bonding strength of the non-junction region 50 can be reduced.

For example, in Fig. 6, reference symbol Ps denotes an interval in the vertical direction of the multiple embossed portions 51 in any column. As shown in Fig. 6, the vertical spacing Ps between the sub-embossments 51 is preferably wider than the vertical spacing Pu between the main embossments 41 (the upper embossments 41a). For example, it is preferable that the interval Ps between the upper and lower embossments 51 in the vertical direction is 200% to 1000% or 300% to 600% with respect to the vertical interval Pu between the main embossments 41. 6, reference character Ds denotes a displacement distance between the sub-embossing portion 51 located in a certain column and the sub-embossing portion 51 located in the nearest column in the vertical direction. In the case where the rows of the embossing portions 51 are offset, it is preferable that the deviation distance Ds is wider than the interval Pu between the main embossing portions 41 in the vertical direction. For example, the distance Ds is preferably 150% to 500% or 200% to 300% with respect to the interval Pu.

In FIG. 6, reference symbol Gs denotes the interval between the rows of the sub-embossing portions 51 in the left-right direction. As shown in Fig. 6, it is preferable that the gap Gs in the left-right direction of the row of the sub-embossing portion 51 is wider than the gap Gs in the row left-right direction of the main embossing portion 41. [ For example, the gap Gs in the left-right direction of the row of the sub-embossing portions 51 is preferably 120% to 500% or 150% to 300% with respect to the gap Gs in the row-left direction of the main embossing portion 41. By making the gap in the vertical direction and the gap in the horizontal direction of the embossed pattern 50 of the sub-bonded region 50 wider than the embossed pattern of the main bonded region 40, the bonded area of the sub- Can be narrowed.

More specifically, it is preferable that the bonding area ratio of the non-bonding area 50 is smaller than the bonding area ratio of the main bonding area 40. Here, the bonding area ratio of the non-bonding area 50 is the ratio of the total area of the plurality of the sub-embossing parts 51 to the total area of the non-bonding area 50. Similarly, the bonding area ratio of the main bonding region 40 is the ratio of the total area of the main embossing portions 41 to the total area of the main bonding region 40. The total area of the main bonding region 40 and the sub-bonding region 50 is set so that the width of the edge of the outermost one of the embossed portions located at the outermost side of the embossed portion, Area can be obtained. The total area of the plurality of main embossing portions 41 and the total area of the plurality of sub-embossing portions 51 are set such that the number of the embossing portions belonging to the main bonding region 40 or the sub- . The bonded area ratio of the non-bonded area 50 thus obtained is preferably 1% to 50%, more preferably 1% to 30%, and even more preferably 1% to 15% of the bonded area ratio of the main bonded area 40, Is particularly preferable. The area of one sub-embossing portion 51 is preferably about 50% to 200%, more preferably 70% to 150% with respect to the area of one main embossing portion 41.

6, it is preferable that the width Bs of the sub-junction region 50 is narrower than the width Bu of the main junction region 40 (the upper junction region 40a). The width Bs of the auxiliary junction region 50 is preferably 40% to 95% or 50% to 70% with respect to the width Bu of the main junction region 40 (upper junction region 40a).

In order to set the bonding strength of the sub-bonded region 50 to be weak, the sum of the lengths of the plurality of sub-embossments 51 arranged in the up-and-down direction in the sub- May be shorter than that of the main bonding region 40. [ That is, in the present specification, the term "bond strength" is defined as the peak value of the tensile strength when the main bonding region 40 and the sub bonding region 50 are opened in the direction of 180 degrees from the inside of the diaper, The longer the sum of the lengths of the multiple embossing portions in the vertical direction, the higher the bonding strength, and the shorter the bonding strength. In this case, "the sum of the lengths of the plurality of embossed portions arranged in the vertical direction in the vertical direction" means the length of the vertical sides of the plurality of embossed portions of the diagonal lines extending when the imaginary line extending in the vertical direction is pulled in parallel with the side edge of the disposable diaper . Further, in the case where the information is not parallel to the high-level assumed line of the embossed portion, it means the length of each embossed portion in the vertical direction across the expected line. For example, the sum of the lengths of the plurality of sub-embossing portions 51 arranged in the up-and-down direction in the sub-bonded region 50 in the up-down direction is larger than the sum of the lengths of the main embossing portions 41 arranged in the up- Is preferably 1% to 50%, 1% to 30%, or 1% to 15% with respect to the sum of the lengths in the up and down directions.

In order to set the bonding strength of the sub-bonding region 50 to be weak, the depth of each sub-embossing portion 51 of the sub-bonding region 50 is set to be equal to the depth of each main embossing portion 40 of the main bonding region 40, (41). In forming the side seal portion 4 by the heater seal or the ultrasonic seal, the height of the pattern block used for the heater seal or the ultrasonic sealing is actually subjected to a process called cylindrical polishing, As shown in Fig. Therefore, the embossing pattern disposed on the pattern block becomes once the same height. Therefore, it is preferable that the pattern blocks forming the sub-embossed portions 51 of the sub-bonded region 50 are further polished after the embossing pattern is processed to have the same height so that the height of the pattern blocks can be reduced. For example, the height of the pattern block forming the sub-embossing portion 51 is preferably 3 μm or more smaller than the height of the pattern block forming the main embossing portion 41. For example, the height of the pattern block forming the sub-embossing portion 51 is preferably 3 to 100 μm or 5 to 50 μm lower than the height of the pattern block forming the main embossing portion 41. The height of the pattern block forming the sub embossing portion 51 may be gradually increased toward the pattern block forming the main embossing portion 41. [ By doing so, the depth of the main embossing portions 41 of the depth main bonding region 40 of each sub-embossing portion 51 of the bonding region 50 formed in the side seal portion 4 can be made shallower. As the depth of each embossed portion 51 becomes shallow, the bonding strength of the non-bonded region 50 is consequently weakened. By adjusting the depth of each embossing portion 51, the embossing pattern of the main bonding region 40 and the embossing pattern 50 of the sub-bonding region 50 can be set to the appropriate range, May be the same pattern.

In the above description, the embossing pattern of the sub-bonding region 50 is compared with the embossing pattern of the main bonding region 40. However, the embossing pattern of the main bonding region 40 may be different from the embossing pattern of the non- The embossing pattern may have a bonding strength different from region to region. For example, the embossing pattern of the non-bonding area 50 and the embossing pattern of the main bonding area 40 may differ depending on the bonding area ratio, the spacing between the upper and lower sides of the embossing part, the spacing in the left and right direction, In the case where the non-bonding area 50 and the main bonding area 40 have many types of bonding area ratios, the vertical spacing of the embossing part, and the left and right spacing, ) Can be performed by cutting out predetermined portions neighboring in the left-right direction. For example, as described in the description of the measurement method of "bonding strength ", a comparison between the non-bonding area 50 and the main bonding area 40 is made in a predetermined region neighboring in the left- : 30 mm).

6, the plurality of sub-embossing portions 51 form a plurality of rows side by side at an interval in the vertical direction, and a plurality of rows of the sub-embossing portions 51 It is preferable that they are formed at intervals in the left-right direction in a state of being offset from each other. The length of each embossing portion 51 in the left-right direction is preferably 2 mm to 5 mm, and the length in the up-down direction is preferably 0.3 to 5 mm. The interval between the upper and lower embossing portions 51 is preferably in the range of 5 mm to 50 mm.

It is preferable that the non-joined region 50 is formed at a position within 5 mm from the end edge 4a of the left and right side portions of the diaper. That is, any one of the sub-embossed portions 51 provided in the non-joined region 50 is disposed within 5 mm from the end edge 4a of the diaper. For example, Fig. 6 shows the distance between the outermost edge of the sub-joint region 50 and the edge 4a of both side portions of the diaper at S1. The distance S1 is preferably within 5 mm. By forming the non-joined region 50 at a position within 5 mm from the end edge 4a of the diaper, even if the left and right ends of the outer body of the body front and the body of the back of the body are curled up, the curled width can be suppressed within 5 mm It is effective because it can. Further, as will be described later, the sub-joined region 50 may reach the end edge 4a of the diaper, and the distance S1 may be 0 mm. Since the bonding strength of the sub bonding area 50 is lower than that of the main bonding area 40, even if the end face of the sub embossing part 51 is exposed in the diaper edge frame 4a, The damage can be prevented.

As shown in Fig. 6, it is preferable that a region (non-bonding region) having no bonding portion exists between the main bonding region 40 and the non-bonding region 50. [ In Fig. 6, the width of the non-junction region existing between the main junction region 40 and the non-junction region 50 is represented by S2. For example, the width S2 of the non-bonding area is preferably 0.5 mm to 4 mm, or 1 mm to 3 mm, and more preferably 1.5 mm or more. By doing so, when the side seal portion 4 is peeled off in disposing the disposable diaper, it becomes easy to peel off the non-joined region 50. That is, when the side seal portion 4 is peeled off, the diaper is generally peeled from the inside to the outside. Therefore, first, the main bonding region 40 is peeled off, and then the non-bonding region 50 is peeled off. Here, since there is a non-bonding region between the main bonding region 40 and the non-bonding region 50, the force that the user breaks the side sealing portion 4 is generated by breaking the main bonding region 40, So that the momentum is applied to the sub-joined region 50 as it is, and the sub-joined region 50 is torn. Therefore, the user can feel that the side seal portion 4 is apt to bark sensitively. In the present invention, since the side seal portion 4 has the main bonding region 40 and the sub bonding region 50, the total width of the side seal portion 4 is smaller than that of the conventional side seal portion having no sub bonding region 50 It widen. As described above, a non-bonding region is provided between the main bonding region 40 and the non-bonding region 50 to give the user a feeling that the side sealing portion 4 can be torn easily, It is possible to eliminate the difficulty of tearing the side seal portion 4 due to the above-mentioned problem.

 (2-3. Process of forming the side seal portion)

Next, with reference to Fig. 7, a process of forming the side seal portion in the method of manufacturing the pull-on disposable diaper will be described. The process of forming the side seal portion is basically performed at the final stage of the manufacturing method of the pull-on type disposable diaper. Fig. 7 conceptually shows the flow of the final step of the method of manufacturing the pull-on type disposable diaper.

As shown in Fig. 7, according to a general manufacturing method, a diaper continuous 100 'in which a plurality of disposable diapers are arranged side by side is obtained (step S1). The diaper continuum 100 'is configured such that a plurality of body front-face outer sheaths are continuous in the left-right direction at a position where the side seal portion 4 is to be formed to form a continuum 1a', and a plurality of body rear- 4 in the left and right direction at the planned formation site to form a continuum 2a '. The absorbent main body 3a is arranged so that the diaper continuum 100 'is perpendicular to the continuum body 2a' of the continuous body 1a 'and the back body external body of the body together with the body frontal external body. At this time, in the portion of the diaper continuum 100 'where the side seal portion 4 is to be formed, a hot melt adhesive for fixing the waist elastic member 20 and the dummy elastic member 21 to the external body is not coated desirable. That is, the hot-melt adhesive is partially and intermittently applied along the left and right direction (flow direction) of the diaper continuum 100 ', and the intermittent portion 110 is adjusted so as to coincide with the intended formation site of the side seal portion 4. As a result, neither the elastic stretchable member nor the hot melt adhesive for fixing the elastic stretchable member is present at a portion where the side seal portion 4 is to be formed.

Subsequently, the diaper continuum 100 'is folded in the vertical direction in the crotch region where the absorbent main body 3a is arranged (step S2). Thus, the continuum 1a 'of the outer body of the body front portion and the continuum 2a' of the outer body of the body rear portion overlap each other. At this time, the positions of the intermittent portion 110 formed on the side of the continuum body 1a 'of the trunk front face outer body and the positions of the intermittent portion 110 formed on the side of the body rear face portion external body 2a' coincide with each other.

Subsequently, the side seal portion 4 is formed with respect to the diaper continuum 100 'in which the front portion of the body and the back portion of the body are superimposed on each other (Step S3). The side seal portion 4 is formed at a position corresponding to the right and left side portions of the body front portion and the back portion of the body when the disposable diaper 100 is a separate pants type. Here, as shown in Fig. 7, the side seal portion 4 is formed on the right side of any pants-type disposable diaper, and on the left side portion of another neighboring pants-type disposable diaper, . The formation of two pairs of side seal portions 4 means that a pair of embossing patterns are engraved on the embossing roll pattern block which forms a heater seal or an ultrasonic seal. Therefore, by introducing the diaper continuing body 100 'between the embossing roll and the anvil roll, the side seal portions 4 are formed side by side by only one rotation of the embossing roll and the anvil roll. As shown in the enlarged view of the side seal portion 4 in Fig. 7, the side seal portions 4 are provided with the main bonding region 40 and the main bonding region 40, And a sub-junction region 50 provided at a position near the dashed line. As shown in the enlarged view of Fig. 7, the two sets of side seal portions 4 are formed in a state where the respective sub-junction regions 50 are adjacent to each other. That is, between the two sub-junction regions 50, the line (one-dot chain line) of the diaper continuum 100 'to be cut is located.

Thereafter, the diaper continuing body 100 'on which the side seal portion 4 is formed is cut in the vertical direction along a line (one-dot chain line) to be positioned between the two pairs of side seal portions 4 (step S4). That is, the diaper continuum 100 'is cut at the interface of the two sub-junction regions 50. Accordingly, the individual pants-type disposable diaper 100 is separated from the diaper continuum 100 '. Through the above process, it is possible to manufacture the pull-on type disposable diaper 100 of the present invention.

 (2-4 different embossing patterns in the side seals)

Next, patterns different from the embossing pattern shown in Fig. 3 and the like will be described with reference to Figs. 8 (a), 8 (b), 9 (a) and 9 (b). The embossing patterns shown in Figs. 8 and 9 are different from the embossing pattern shown in Fig. 3 or the like in that at least two or more of the plurality of embossed portions 51 formed in the sub- And the end edge 4a on both the left and right sides of the rear portion 2 of the body. 8 and 9, since the plurality of sub-embossed portions 51 reach the end edges 4a on both the left and right sides of the body front portion 1 and the rear portion 2 of the body, It is possible to reliably prevent the left and right end edges 4a from being opened.

More specifically, in the embossing pattern of Fig. 8 (a), a plurality of substantially elliptical sub-embossed portions 51 are arranged along the line along which the diaper is to be cut (one-dot chain line) . Therefore, by cutting the diaper continuum along the line along which the object is intended to be cut, the plurality of sub-embossed portions 51 on the expected line to be cut are divided into two. Thus, in the sub-bonding region 50 of each side seal portion 4, the divided sub-embossing portions 51 reach the end edges 4a on both sides of the diaper.

In the embossing pattern shown in Fig. 8 (b), the sub-bonded region 50 is formed by a plurality of sub-embossed portions 51 on the single line, and the sub- And is relatively concentrated in the vicinity. Further, on the line along which the material is to be cut, a plurality of sub-embossed portions 51 are arranged in rows in the vertical direction at intervals. In the embossing pattern shown in Fig. 8 (b), the heat of the sub-embossing portion 51 arranged on the line to be cut is offset in the vertical direction from the heat of the sub-embossing portions 51 on both sides.

The embossing pattern of Fig. 9 (a) is a modification of the embossing pattern of Fig. 8 (c). In the embossing pattern shown in FIG. 9A, the rows of the sub-embossing portions 51 arranged on the line along which the material is to be cut and the rows of the sub-embossing portions 51 located on both sides of the row are displaced from each other in the vertical direction .

In the embossing pattern shown in Fig. 9 (b), a plurality of sub-embossed portions 51 having a long linear shape and extending in the left-right direction beyond the line along which the object is intended to be cut (dashed-dotted line) are arranged in a line . The length of the long linear sub-embossing portion 51 in the left-right direction is 3 mm to 15 mm, preferably 5 mm to 10 mm. The long linear sub-embossing portion 51 is divided into two sub-junction regions 50 by cutting the diaper continuum along the line to be cut. According to the embossing pattern shown in Fig. 9 (b), it is possible to more reliably prevent curling of both side edge portions of the disposable diaper.

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

 (3. Absorbent Body)

Finally, the structure of the absorbent main body 3a to be held by the above-described body front-side outer body 1a and the back-side body part 2a will be described.

The absorbent main body 3a is held in a state of being bridged between the trunk front and back outer bodies 1a and 2a and is placed in the crotch part of the wearer when the disposable diaper 100 is worn, And absorbs liquid such as urine which the wearer excreted. The absorbent main body 3a is disposed over the body front portion 1 and the back body portion 2 around the crotch portion 3 of the disposable diaper.

2, the absorbent main body 3a has a basic structure of an absorbent body 31, a top sheet 32, a back sheet 33 and a pair of three-dimensional wrinkles 34. As shown in Fig.

The absorber 31 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorbent body 31 is disposed between the liquid permeable top sheet 32 and the liquid impervious back sheet 33. The absorbent body 31 has a function of absorbing liquid permeated through the topsheet 32 and is made of an absorbent material. A known material can be used as the absorbent material constituting the absorbent body 31. [ As the absorbent material, for example, a flap pulp, a super absorbent polymer, or a hydrophilic sheet may be used. As the water absorbent material, one type of flap pulp, super absorbent polymer or hydrophilic sheet may be used alone, or two or more types may be used in combination. The water absorbent material is usually used as a single layer or a multi-layered mat. The shape of the absorbent body 31 can be appropriately designed to suit 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. It may also be a square shape, an elliptical shape, or a tortuous shape used in a general disposable diaper.

The topsheet 32 is a member for directly contacting the skin of the crotch part of the wearer and for transmitting liquid such as urine to the absorbent body 31. [ Therefore, the top sheet 32 is made of a highly flexible liquid-permeable material. In addition, the topsheet 32 is arranged to cover the skin-contacting side of the absorbent body 31. Examples of the impermeable material constituting the topsheet 32 are a woven fabric, a nonwoven fabric, or a porous film. Further, for example, thermoplastic resin fibers such as polypropylene, polyethylene, polyester, and nylon may be subjected to a hydrophilization treatment and a nonwoven fabric may be used.

The back sheet 33 is a member for transmitting the top sheet 32 and preventing the liquid absorbed in the absorbent body 31 from leaking to the outside of the diaper. Thus, the back sheet 33 is made of a liquid impermeable material. The back sheet 33 covers the absorber 31 on the skin-facing side so as to prevent leakage from the bottom surface of the absorber 31. An example of the opaque material constituting the back sheet 33 is a liquid impermeable film made of a polyethylene resin. It is particularly preferable to use a microporous polyethylene film having many fine holes of 0.1 to 4 탆.

A pair of the three-dimensional wrinkles 34 is a member for standing up along both side edges of the absorbent body 31 and preventing leaking of the urine discharged by the wearer to the side. Each of the three-dimensional wrinkles 34 is provided with a three-dimensional wrinkle stretchable material 35 at the distal end thereof, and when the three-dimensional wrinkle stretchable material 35 is shrunk, it rises toward the wearer's skin. Therefore, the pair of three-dimensional corrugations 34 constitute a leakage preventing wall of the urine, and the urine which has not permeated through the topsheet 32 or the urine absorbed by the absorbing body 31, Thereby preventing side leakage that leaks from openings around the legs and the like. The three-dimensional wrinkle 34 may adopt a known configuration used in a conventional disposable diaper. The three-dimensional wrinkles 34 can be formed, for example, by interposing a three-dimensional wrinkle stretchable material 35 in a stretched state between the layers of the water-repellent sheet. As the water repellent sheet, for example, a nonwoven sheet obtained by a method such as card embossing or spunbond can be used, and it is particularly preferable to use a nonwoven sheet such as SMS or SMMS having high water resistance. The elastic wrinkle stretch material 35 is generally made of a thread-like elastic rubber. As such a rubber material, materials such as styrene-based rubber, olefin-based rubber, urethane-based rubber, ester-based rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene, silicone and polyester can be used.

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

1 ... body front part 1a ... body front part external body
2 ... rear portion of the body 2a ... rear portion of the body
3 ... crotch portion 3a ... absorbent body
4 ... side seal part 4a ... end edge
40 ... main bonding region 40a ... upper bonding region 40b ... lower bonding region
41 ... main embossing portion 41a ... upper embossing portion 41b ... lower embossing portion
50 ... Sub-bonding area 51 ... Sub-
100 ... disposable diaper 100 '... diaper continuum 110 ... intermittent portion

Claims (9)

A body front portion 1 abutting on a wearer's abdomen, a body back portion 2 abutting on a wearer's back portion and a crotch portion 3 positioned between the body front portion 1 and the body rear portion 2 ,
A pair of side seal portions 4 are formed in a state where the right and left side portions of the body front portion 1 and the left and right side portions of the body rear face portion 2 are overlapped and joined together by a heater seal or an ultrasonic seal In a pull-on disposable diaper,
The pair of side seal portions (4)
A main bonding region 40 extending in the vertical direction,
(50) located outside the main bonding region (40) in the lateral direction and extending in the vertical direction,
The main bonding region 40 is a region formed by providing a plurality of embossing lines in which a plurality of main embossing portions 41 are arranged in parallel in the vertical direction,
The sub-joint regions 50 are regions formed by one or more rows of embossing lines in which the plurality of embossing portions 51 are arranged in parallel with each other in the vertical direction,
The vertical spacing and the horizontal spacing of the embossed pattern of the auxiliary bonded area 50 are wider than the vertical spacing and lateral spacing of the embossed pattern of the main bonded area 40,
And the bonding strength of the sub-bonding region (50) is weaker than the bonding strength of the main bonding region (40). And a crotch part (3) located between the body front part (1) and the body back part (2), the body front part (1) being in contact with the abdomen of the wearer, the body back part (2)
A pair of side seal portions 4 are formed in a state where the right and left side portions of the body front portion 1 and the left and right side portions of the body rear face portion 2 are overlapped and joined together by a heater seal or an ultrasonic seal In a pull-on disposable diaper,
The pair of side seal portions (4)
A main bonding region 40 extending in the vertical direction,
(50) located outside the main bonding region (40) in the lateral direction and extending in the vertical direction,
The sub-joint regions 50 are regions formed by one or more rows of embossing lines in which the plurality of embossing portions 51 are arranged in parallel with each other 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,
At least two or more of the plurality of sub-embossments 51 formed in the sub-joint region 50 are arranged at the edges 4a on both the left and right sides of the body front portion 1 and the body rear portion 2, Pants-type disposable diapers reaching. 3. The method according to claim 1 or 2,
The bonding strength of the sub-bonded region (50) is 50% or less with respect to the bonding strength of the main bonded region (40). 3. The method according to claim 1 or 2,
The main bonding region 40 and the auxiliary bonding region 50 are not coated with an adhesive,
Wherein both the left and right side portions of the body front portion (1) and the body rear portion (2) are joined only by heat fusion by a heater seal or an ultrasonic seal. 3. The method according to claim 1 or 2,
The non-bonded region 50 is an area formed by providing a plurality of embossing rows in which a plurality of sub-embossing portions 51 are arranged in parallel in the vertical direction,
Wherein the bonding strength of the sub-bonding region (50) is 30% or less with respect to the bonding strength of the main bonding region (40). A rear waist region 2 abutting on the back of the wearer and a crotch region 3 located between the front and rear waist regions 1 and 2, A method of manufacturing a pull-on type disposable diaper,
A step of obtaining a diaper continuum in which a plurality of said disposable diapers are connected in a lateral direction;
Folding the diaper continuum at the crotch part (3) and superimposing the body front part (1) and the body back part (2)
A joining step of forming right and left side portions of the body front portion 1 and right and left side portions of the body rear face portion 2 by heat seal bonding with a heater seal or an ultrasonic seal;
And a cutting step of cutting the diaper continuum in the vertical direction at a position corresponding to the end edges (4a) of both the left and right sides of the body front face portion (1) and the body back face portion (2) to obtain the individual pants type disposable diaper In addition,
In the side seal portion 4 formed in the joining step,
A main bonding region 40 extending in the vertical direction,
(50) located outside the main bonding region (40) in the lateral direction and extending in the vertical direction,
The sub-joint region 50 is an area formed by one or more rows of embossing lines in which a plurality of sub-embossing portions 51 are arranged in parallel with each other 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,
Wherein the diaper continuum is cut in a vertical direction at a boundary position of the two sets of sub-joined regions (50). 3. The method according to claim 1 or 2,
Wherein a junction area of said sub-junction region (50) is narrower than a junction area of said main junction region (40). 3. The method according to claim 1 or 2,
Wherein the width (Bs) of the auxiliary bonded area (50) is narrower than the width (Bu) of the main bonded area (40). 3. The method according to claim 1 or 2,
Wherein the depth (51) of each sub-embossed portion of the sub-bonded region (50) is shallower than that of each main embossed portion (41) of the main bonded region (40).

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