TW201446223A - Pant-type disposable diaper and manufacturing method therefor - Google Patents

Abstract

To provide a pant-type disposable diaper for which the side seal sections formed on the left and right sides of the diaper are attractive and the side seal sections have a good feel. A pant-type disposable diaper in which a pair of side seal sections (4) is formed, wherein the pair of side seal sections (4) comprise main seam areas (40) that extend in the vertical direction and secondary seam areas (50) that are positioned to the outside of the main seam areas (40) in the left-right direction and extend in the vertical direction. The secondary seam areas (50) here are areas formed by providing one or multiple embossed rows in which multiple secondary embossed parts (51) form a line at intervals in the vertical direction. The seam strength of the secondary seam areas (50) is set to be weaker than the seam strength of the main seam areas (40).

Description

Pants type disposable diaper and manufacturing method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a disposable diaper that is worn under the wearer and that absorbs and supports liquid such as urine and a method of manufacturing the same. More specifically, the disposable diaper which is formed into a pants type by joining the left and right side portions of the front body and the back body to the side seal portions, and a method for producing the same are disclosed.

In the past, diapers worn by infants or elderly people are known as pants-type disposable diapers. A general pants type disposable diaper has an absorbent body having a liquid absorbing function, and a cover sheet for supporting the absorbent body in the lower jaw of the wearer. The cover sheet is previously joined to the left and right end portions of the front body and the back body, and the disposable diaper is molded into a pants type. Therefore, the wearer can wear the pants-type disposable diaper by inserting the two leg portions from the opening around the waist. Further, in the side seal portion, in order to allow the front end portion and the rear end portion to be joined at an appropriate joint strength, the wearer can easily take off the pants type disposable type by tearing the side seal portion. diaper.

The side seal portions as described above are generally formed by heat-welding the members of the thermoplastic sheets constituting the cover sheet of the diaper with each other by heat sealing or ultrasonic sealing. For example, a heat seal is a process in which a plurality of laminated thermoplastic sheets are introduced between a pair of rollers, wherein the pair of rollers are composed of an embossing roller having a single-side engraved joint pattern block and a flat anvil roller. Secondly, the embossing roller and the anvil roller are used to heat and press the thermoplastic sheet to dissolve the bonding technique of the sheet. Furthermore, the so-called ultrasonic sealing is introduced between a block of engraving and a horn that transmits ultrasonic vibration, and a plurality of laminated thermoplastic sheets are introduced, and then the sheet is pressurized while giving super The bonding technique of dissolving the sheet by the frictional heat by the sonic vibration.

As described above, a technique of forming a pair of side seal portions on both left and right sides of the disposable diaper by heat sealing or ultrasonic sealing is disclosed in Patent Document 1 or Patent Document 2.

[Patent Document 1] Japanese Patent Publication No. 2004-523374

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2002-102283

However, the cover sheets constituting the front and back of the disposable diaper are only joined at the joint portion extending in the up-and-down direction, and the portions other than the joint portion are not attached. That is, in the portion closer to the outer side in the left-right direction of the joint portion, since the cover sheet of the front body and the cover sheet of the back body are not followed, the cover sheet of the front body and the cover sheet of the back body are floated loosely in the non-adjacent portion. Open, there are problems such as unsightly.

However, the elastically stretchable member for imparting stretchability in the cover sheet of the diaper is often fixed. For example, in the portion around the waist of the front body and the back body or around the abdomen, the elastically stretchable member is sandwiched between the layers of the plurality of sheet members, and is fixed by a hot melt adhesive or the like. The coating method of the hot-melt adhesive is, for example, applied to the surface of the sheet-like member constituting the cover sheet, and directly applied to the elastically stretchable member. In addition, in the cover sheet, in addition to the fixed elastically stretchable member, there is also a case where a hot-melt adhesive is applied in order to bond the cover sheets of the front body and the back body to each other. Here, as described above, when the side seal portions are formed on the left and right side portions of the disposable diaper, a bonding technique of so-called heat sealing or ultrasonic sealing can be used. The heat seal or ultrasonic seals utilize heat welding to bond the thermoplastic sheets to one another. However, there is a problem that if a hot-melt adhesive is present in the joint portion of the thermoplastic sheet, heat is used to dissolve the hot-melt adhesive, so that the thermoplastic sheet to be joined becomes insufficiently heated, resulting in unstable joint strength. The dissolved hot-melt adhesive exhibits adhesiveness at the joint portion, and the relief pattern of the joint portion is solidified and hardened in a chaotic state. Therefore, when the joining of the side seal portions is mentioned, it is preferable that the joint portion is not coated with the hot-melt adhesive. Therefore, in the disposable diaper, it is preferable that the portion where the side seal portion is to be formed is not coated with the hot-melt adhesive or the elastically stretchable member is not fixed. For example, in addition to the portion where the side seal portion is formed, by intermittently coating the hot-melt adhesive for fixing the elastically stretchable member, at least the side seal portion can be provided without the presence of a hot-melt adhesive or elasticity. The state of the telescopic member. However, by intermittently coating the hot-melt adhesive, the left and right side portions (side seal portions) of the disposable diaper are formed in a region where the hot-melt adhesive is not present, and the disposable diaper is completed. Two threats In the region in which the joint portion (main joint region) for the purpose of the combination of the cover sheet of the front body and the cover sheet of the back body is outward in the left-right direction, there is still a region (non-adjacent region) where the front body and the back body are not adjacent to each other. Therefore, the left and right side ends of the disposable diaper have a problem that the cover sheet of the front body and the cover sheet of the back body are unwound and unsightly at the non-adjacent portion.

On the other hand, in order to prevent the cover sheets of the front body and the back cover of the front body from being loosened at the left and right side portions, the joint portions are formed at positions close to the left and right side edges of the diaper. However, in the trouser type diaper, as described later, the continuous sheet is laminated in a plurality of layers, and joined by two pairs of joint portions, and each of the pants type diapers is obtained by cutting therebetween. Therefore, if there is no space left between the joint portions, it is impossible to cut between the joint portions at the time of cutting, and the joint portion is cut. As a result, the degree of uneven bonding strength of the joint portion becomes large. Further, since the cross section of a plurality of joint portions in the cutting portion is exposed, the skin feel may be deteriorated. Therefore, conventionally, it has been disadvantageous that the joint portion (main joint region) for the purpose of following the cover sheet of the front body and the cover sheet of the back body is formed on the side of the left and right sides of the diaper.

As described above, in the prior art, the appearance of the side seal portion of the pants type disposable diaper is excellent, and the skin touch of the side seal portion is difficult to achieve. Therefore, there is a need for a technique for the side seal portion of a trouser-type disposable diaper. On the left and right sides of the diaper, the cover sheet of the front body and the cover sheet of the back body are prevented from being loosened, and the diaper is prevented from being damaged. The technology of the skin touch on the left and right sides.

Therefore, the inventors of the present invention have made efforts to investigate the method for solving the above-mentioned problems of the prior invention, and have obtained the following findings: the front and back sides of the disposable diaper are placed in the main joint region at the same time, and at the same time By forming a sub-joining region in which the bonding strength is weaker than the main bonding region on the outer side in the left-right direction from the main joining region, the cover sheet of the front body and the cover sheet of the back body can be prevented from being loosened, and the appearance of the pants-type disposable diaper is excellent. It also prevents damage to the skin on the left and right sides. Therefore, the inventors of the present invention have completed the present invention based on the above knowledge and have come up with problems that can solve the conventional techniques.

The present invention has the following composition, if specifically stated.

The first invention of the present invention relates to a pants type disposable diaper.

The pants type disposable diaper of the present invention is divided into the front body 1 which is connected to the wearer's abdomen The back body 2 on the back of the wearer and the crotch portion 3 between the front body 1 and the back body 2. Furthermore, the trousers type disposable diaper is one of the heat-welded joints formed by heat sealing or ultrasonic sealing in which the left and right side portions of the front body 1 and the left and right side portions of the back body 2 are respectively corresponding and overlapped. The side seal portion 4 is opposed.

Here, the pair of side seal portions 4 have a main joint region 40 extending in the vertical direction, and a sub-joining region 50 extending outward in the left-right direction from the main joint region 40.

The sub-joining region 50 is a region in which a plurality of sub-embossed portions 51 are arranged in a row and arranged in a row in the vertical direction, and one or a plurality of columns are arranged.

According to the above configuration, the pants-type disposable diaper of the present invention is formed at a portion on the left and right outside of the main joining region 40, and a sub-joining region 50 for preventing the front body and the back body from being loosened is formed. The main joining region 40 is The front and rear left and right sides of the back body are followed by the purpose. In this way, by providing the sub-joining region 50, the problem that the cover sheets of the front and back sides of the left and right sides of the diaper and the cover sheets of the back body are unsmoothed can be solved. Further, the joint strength of the sub-joining region 50 is weaker than that of the main joining region 40. That is, the sub-joining region 50 is not intended to be used for the anterior and posterior portions of the diaper, as long as it can prevent the release of the cover sheets on both sides of the diaper, so that the joint strength can be compared with the main joint region. The joint strength of 40 is greatly reduced. Thereby, even if the sub-joining area 50 is provided, the touch of the diaper is hardly affected, and as a result, the wearing feeling of the diaper can be improved.

In the present invention, the sub-joining region 50 has a bonding strength, and the bonding strength is preferably 50% or less as compared with the main bonding region 40.

As described above, by making the joining strength of the sub-joining region 50 equal to or less than half of the joining strength of the main joining region 40, the skin feel of the entire sub-joining region 50 can be kept soft. Further, by setting the joint strength of the sub-joining region 50 to be low, the wearer can prevent the left and right side portions of the diaper joined by the side seal portion 4 from being easily broken when the disposable diaper is removed.

The pants-type disposable diaper of the present invention applies the adhesive to the main joining region 40 and the sub-joining region 50, and the left and right sides of the front body 1 and the back body 2 are only thermally welded by heat sealing or ultrasonic sealing. The jointer is preferred. For example, in the main joining region 40 and the sub joining region 50, the sheet members constituting the left and right side portions of the front body 1 and the back body 2 are not joined by an adhesive, and are formed on the left and right sides of the front body 1 and the back body 2 Not used on the sheet member It is preferred that the adhesive fixes the elastically stretchable member.

As described above, when an adhesive such as a hot-melt adhesive is present in a portion where the main bonding region 40 and the sub-bonding region 50 are expected to be formed, even if it is desired to be sealed by heat sealing or ultrasonic cleaning, the main forming is performed. In the joint region 40 and the sub-joining region 50, heat generated by heat sealing or ultrasonic sealing becomes a function of dissolving the hot-melt adhesive. As a result, the following problem occurs: the thermoplastic sheet to be joined becomes insufficiently heated, the joint strength is unstable, the adhesive portion exhibits stickiness due to the dissolved hot-melt adhesive, and the relief pattern of the joint portion is disordered. In the state, the curing becomes hard and the like. Therefore, as for the joining of the side seal portions, it is preferable that the joint portion is not coated with a hot melt adhesive. However, if the side seal portion is not coated with the hot-melt adhesive, on the left and right sides of the diaper, there is a problem that the cover sheet of the front body and the cover sheet of the back body are unraveled. Therefore, in a preferred embodiment of the present invention, in order to solve the problems at the same time, the hot-melt adhesive is not applied to the portion where the side seal portion is to be formed, and not only the main portion is formed by the portion where the hot-melt adhesive is not applied. The joint region 40 also forms the sub-joining region 50, and prevents the cover sheet of the front body and the cover sheet of the back body from being loosened, so that the both sides of the disposable diaper have a good appearance and are stably joined.

In the pants-type disposable diaper of the present invention, at least two of the plurality of sub-relief portions 51 formed in the sub-joining region 50 are preferably at the side ends 4a of the left and right sides of the front body 1 and the back body 2.

According to the above configuration, by the plurality of sub-embossed portions 51 reaching the side ends 4a of the left and right sides of the front body 1 and the back body 2, the cover sheets of the front body and the cover sheets of the back body can be more reliably prevented from being loosened.

In the pants-type disposable diaper according to the present invention, the main joining region 40 is preferably a plurality of main embossing portions 41 which are arranged in a row in the vertical direction, and are preferably formed by a plurality of arrays. Similarly, in the sub-joining region 50, the plurality of sub-embossed portions 51 are preferably arranged in a row in the vertical direction, and are preferably formed by a plurality of arrays. Here, the joint strength of the sub-joining region 50 is preferably 30% or less compared to the joint strength of the main joining region 40.

As described above, both the main joining region 40 and the sub joining region 50 are formed by a plurality of embossing rows provided by maintaining a space in the left-right direction, and the joining strength by the sub-joining region 50 is stronger than that of the main joining region 40. The joint strength is greatly reduced, which is effective It prevents the cover sheet of the front body and the cover sheet of the back body from loosening, and damages the skin touch of the diaper.

Further, the main joining region 40 is a joint portion for providing the joint strength required for the two flank portions to be worn, and the sub-joining region 50 is a joint portion for preventing the outer side of the main joint region 40 from being loosened in the left-right direction. Therefore, the joint strength of the main joining region 40 and the sub-joining region 50 is preferably a large difference as described above. That is, if the joint strength between the main joining region 40 and the sub-joining region 50 is not greatly different, it is necessary to apply a strong force in order to tear the side seal portion 4. As a result, the pressure of the user is caused, and the force of the tearing will be shaken to the wearer, causing the wearer to be uncomfortable.

Further, in the pants-type disposable diaper according to the present invention, the main joining region 40 is preferably provided so that the left and right side portions of the pants-type disposable diaper extend to the limit in the vertical direction. In contrast, the length in the upper and lower directions of the sub-joining region 50 is preferably shorter than the length in the upper and lower directions of the main joining region 40. Further, it is preferable that the sub-joining region 50 is disposed to be displaced at a position that does not coincide with the end portion of the diaper in the up-and-down direction. Here, the length in the up and down direction means the interval at the outer edge of the outermost relief portion pattern.

If the position of the sub-joining region 50 is as described above, since the joint portion is not exposed at the upper end and the lower end of the diaper, it is possible to prevent the skin from coming into contact with the hard joint portion, which is uncomfortable for the wearer. On the other hand, since the main joining region 40 has to be provided when the diaper is worn and the diaper is worn, it does not tear around the abdomen or around the foot, so that the length in the upper and lower directions of the diaper extends to the limit. Set to be good.

A second invention of the present invention relates to a method of manufacturing a pants type disposable diaper. The trouser type disposable diaper has a front body 1 that is coupled to the wearer's abdomen, a back body 2 that is coupled to the wearer's abdomen, and a lower jaw portion 3 that is located between the front body 1 and the back body 2.

The manufacturing method of the present invention comprises the steps of: obtaining a plurality of connected diaper continuous bodies in the left-right direction of the disposable diaper; and folding back the diaper continuous body in the lower crotch portion 3 and overlapping the front body 1 and the back body 2 a step of forming a joint portion of the left and right side portions of the heat-welded joint front body 1 and the left and right side portions of the left and right side portions of the back body 2 by heat sealing or ultrasonic sealing; and equivalent to the front body 1 and the back body The diaper continuous body is cut in the up-and-down direction at the position of the side 4a of the left and right sides of the 2, and the cutting step of the individual pants type disposable diaper is obtained.

Here, the side seal portion 4 formed in the joining step has an upward and downward direction The main joining region 40 and the sub-joining region 50 which is located outward in the left-right direction from the main joining region 40 and extend in the vertical direction.

Further, the sub-joining region 50 is a embossed column in which a plurality of sub-embossed portions 51 are arranged side by side in the vertical direction, and the bonding strength of the sub-joining region 50 is bonded to the main portion by a region formed by one or a plurality of arrangement. The bonding strength of the region 40 is weak.

Next, in the cutting step, the diaper continuous body is cut in the vertical direction in the boundary position between the two sub-joining regions 50.

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

The present invention can provide a pants-type disposable diaper which is excellent in the appearance of the side seal portion formed on the left and right side portions of the diaper and which has a good touch feeling on the side seal portion.

1‧‧‧Predecessor

2‧‧‧ Back body

3‧‧‧Lower Department

4‧‧‧Side seals

1a‧‧‧Predeternal body

1a’‧‧‧Continuous body of the predecessor

2a‧‧‧Back body

2a’‧‧‧Continuous body of the outer body

3a‧‧‧Absorber body

4a‧‧‧Edge

5‧‧‧Low opening

6‧‧‧ Openings around the feet

10‧‧‧External sheet

11‧‧‧Reflexion

11a‧‧‧Reverse line

12‧‧‧Internal sheet

13‧‧‧buffer forming sheet

20‧‧‧Low stretch material

21‧‧‧Now-knitted worsted stretch material

31‧‧‧Acceptor

32‧‧‧Surface

33‧‧‧ Back side film

34‧‧‧Three-dimensional wrinkles

35‧‧‧Three-dimensional wrinkle expansion material

40‧‧‧Main joint area

40a‧‧‧Upper joint area

40b‧‧‧ joint area

41‧‧‧Main relief department

41a‧‧‧Upper relief department

41b‧‧‧ Lower relief department

50‧‧‧Sub-joining area

51‧‧‧Deputy relief department

71‧‧‧The first layered department

72‧‧‧Second Layered Department

73‧‧‧The third layered department

74‧‧‧Fourth Department

100‧‧‧Disposable diapers

100'‧‧‧ diaper continuum

110‧‧‧Intermittent section

1 is an external perspective view showing a disposable diaper according to the present invention; FIG. 2 is an exploded view showing the disposable diaper of the present invention; and FIG. 3 is an embodiment showing a joint pattern in a side sealing portion; The figure shows a joint pattern in the side seal portion; Fig. 4(a) is a cross-sectional view of the disposable diaper shown in Y1-Y1 in Fig. 2; and Fig. 4(b) is a view in Fig. 2 a cross-sectional view of the disposable diaper of Y2-Y2; Fig. 4(c) is a plan enlarged view showing the side seal portion; Fig. 5 is an enlarged view showing a joint pattern of the main joint portion included in the side seal portion; 6 is a magnified enlarged view showing a main joint region and a sub-joining region included in the side seal portion; FIG. 7 is a flow chart showing one embodiment of the method for manufacturing the disposable diaper according to the present invention; FIG. 9 is a view showing another embodiment of the joint pattern in the side seal portion; and FIG. 9 is a view showing another embodiment of the joint pattern in the side seal portion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described with reference to the drawings. Further, the present invention is not limited to the embodiments described below, and the present invention also encompasses those skilled in the art who can make corrections in a readily apparent range.

In addition, in the patent specification, when referring to the "up and down direction", the pants type disposable diaper in a state in which the front end and the back body are joined to each other, the waist opening is used as the upper end and the lower part as the lower part. The lower end is in the up and down direction (in the figure shown in Fig. 1 and the like, the direction indicated by the arrow Y). In the case of the "left-right direction", the direction of the disposable diaper in a state in which the front end and the back body are joined to each other (in the direction indicated by the arrow X in Fig. 1 and the like).

In addition, "A~B" in this patent specification means "A or more B or less".

(1, the overall composition of disposable diapers)

As long as it is a pants type disposable diaper, the present invention can be widely applied to the general public. The trouser type disposable diaper refers to a disposable diaper in which the front and back sides are joined together in advance. For example, the trouser type disposable diaper may be of a type in which a front body outer body and a rear body outer body are respectively formed to be bridged by the absorber body. Further, the trouser-type disposable diaper may be an outer casing that is integrally molded from the front body to the back body, and the lower crotch portion is used as a center to fix the type of the absorbing body. Hereinafter, the trouser type disposable type in the type In the diaper, the front outer body and the rear body are separately provided, and the pants type disposable diaper of the type in which the absorbent body is bridged between the outer bodies is taken as an example, and the present invention will be specifically described.

Fig. 1 is a perspective view showing an example in which the disposable diaper 100 is seen from the front side. In addition, FIG. 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 in contact with the skin. As shown in the exploded view of Fig. 2, the disposable diaper 100 is divided into the front body of the wearer's abdomen before the wearer's abdomen, the second body of the wearer's back, and the lower part of the wearer's lower jaw. . In the present embodiment, the disposable diaper 100 includes the front body exterior body 1a in the front body 1, and the rear body exterior body 2a in the back body 2. Further, the lower portion 3 between the front outer casing 1a and the rear outer casing 2a is bridged by the absorbent body 3a. In other words, in the present embodiment, the absorber main body 3a is fixed to the front body exterior body 1a at one end side in the longitudinal direction, and the other end portion side in the longitudinal direction is fixed to the rear body exterior body 2a.

As seen from the state of decomposition shown in Fig. 2, the left and right end portions of the front outer casing 1a and the rear outer casing 2a are joined to each other in a state of being overlapped with each other. A pair of right and left side seal portions 4 are formed in the joint portion. Further, in the pair of side seal portions 4, the both end portions of the front outer casing 1a are joined to the both end portions of the rear body outer casing 2a, and the state shown in Fig. 2 is disassembled. The state shown in Fig. 1 is synthesized. As shown in Fig. 1, the waist opening portion 5 is formed by the upper end edge of the front outer casing 1a and the upper end edge of the rear outer casing 2a. Moreover, both ends of the front outer casing 1a and the rear outer casing 2a are joined to the side seal portion 4, and the opening portion 6 around the leg portion around the wearer's foot is formed at the time of wearing. Therefore, the wearer penetrates the two leg portions from the waist opening portion 5, and the leg portions are passed out from the opening portion 6 around the leg portion, so that the disposable diaper 100 can be worn.

Further, as shown in FIGS. 1 and 2, the pair of side seal portions 4 have a main joint region 40 and a sub-joining region 50. In the main joining region 40, the front and rear outer casings 1a and the rear outer casing 2a are joined to each other for the purpose of fixing the left and right end portions of the front outer casing 1a and the rear outer casing 2a, and the front outer casing 1a and the rear outer casing 2a are joined. On the other hand, the sub-joining region 50 is formed on the outer side in the left-right direction from the main joining region 40. The sub-joining region 50 is basically formed to prevent the left and right end portions of the front outer casing 1a and the rear outer casing 2a from being loosened and released, and extends in the vertical direction to extend the front outer casing 1a and the rear outer casing 2a. Gently engage. That is, the joint strength of the sub-joining region 50 is set to be at least weaker than the joint strength of the main joining region 40.

(2, front body and back body)

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

As shown in FIGS. 1 and 2, the front outer body 1a and the rear body outer body 2a are used to hold the disposable diaper 100, and are used to hold between the front outer body 1a and the rear body outer body 2a. The member of the absorber body 3a. The front outer body 1a is a member that engages the wearer's abdomen when worn, and the rear body outer body 2a is attached to the wearer's back when worn.

Further, the front outer casing 1a and the rear outer casing 2a are joined to each other at both end portions in the left-right direction, and a pair of side seal portions 4 are formed at the joint portion. Fig. 3 is an enlarged view showing a joint pattern of the side seal portions 4. As shown in Fig. 3, the side seal portion 4 is attached to the left and right side portions of the front outer casing 1a and the rear outer casing 2a, and has a main joint region 40 extending in the vertical direction from the upper end portion to the lower end portion, and The sub-joining region 50 of the right and left side portions of the front outer casing 1a and the rear outer casing 2a is joined to the outer side in the left-right direction of the main joining region 40. In the present embodiment, each of the main joining region 40 and the sub joining region 50 is formed by collecting a plurality of embossing portions (the main embossing portion 41 and the sub embossing portion 51). The embossed portion (the main embossed portion 41 and the sub-embossed portion 51) mentioned here means one joint. Further, the main joining region 40 is formed in the plurality of main embossing portions 41 so as to be located from the innermost edge at the innermost side to the outermost side. The outer edge is a strip-shaped region that is wide and extends in the up and down direction. Similarly, the sub-joining region 50 is a strip-shaped region extending in the vertical direction from the inner edge located at the innermost side to the outer edge located at the outermost side in the plurality of sub-embossed portions 51. As shown in FIG. 3, each of the main joining region 40 and the sub joining region 50 is formed by arranging a plurality of main embossing portions 41 and a plurality of sub embossing portions 51 in a regular pattern. The detailed description of the main joining region 40 and the sub joining region 50 will be described later.

Further, Fig. 4(a) is a cross-sectional view showing the disposable diaper in the disassembled state shown in Fig. 2 along the line Y1-Y1 in Fig. 2, showing the cutting state in the longitudinal direction of the disposable diaper. Fig. 4(b) is a cross-sectional view showing the disposable diaper in the disassembled state shown in Fig. 2 along the line Y2-Y2 in Fig. 2, showing the cutting state in the longitudinal direction of the disposable diaper. Further, since the original sheets are very thin, in Fig. 4(a) or Fig. 4(b), in order to make the explanation easy to understand, it is conceptually made to have a thickness for drawing.

The front outer body 1a and the rear body outer body 2a have an outer sheet 10 on the non-contact side of the skin, and have an inner sheet 12 on the skin contact side. The outer sheet 10 and the inner sheet 12 can be formed, for example, using a soft fiber nonwoven fabric or a plastic sheet. The fiber non-woven fabric or the plastic sheet is joined by, for example, a hot melt adhesive. It is preferable that the outer sheet 10 and the inner sheet 12 are bonded without the hot-melt adhesive at a position where the main joining region 40 and the sub-joining region 50 are expected to be formed. If the portion where the main bonding region 40 and the sub-bonding region 50 are expected to be formed has a hot-melt adhesive, even if the main bonding region 40 and the sub-junction region 50 are to be formed by a heat welding technique using heat sealing or ultrasonic sealing, The heat generated by heat sealing or ultrasonic sealing will become used to dissolve the hot melt adhesive. As a result, there is a disadvantage in that the thermoplastic sheet as the joining target becomes insufficiently heated, the joint strength is unstable, the adhesive is exhibited at the joint portion due to the dissolved hot-melt adhesive, and the hot-melt adhesive is cured. Harden and other issues. Therefore, it is preferable that the joint portion of the side seal portion 4 is formed without applying a hot melt adhesive.

Further, a plurality of the waist stretch members 20 are disposed in a stretched state along the end portions of the waist portions of the front outer body 1a and the rear body outer body 2a. One of the plurality of waist stretch members 20 is joined to the back body exterior body 2a in a stretched state, and the waist wrinkles are formed by shrinkage. Further, a woven knit tammy material 21 is disposed on the lower side (the lower crotch portion side) of the plurality of waist elastic members 20. The imitation knit worsted stretch material 21 is fixed between the outer sheet 10 and the inner sheet 12 in a stretched state by shrinking the knit worsted stretch material. 21. A virtual wrinkle is formed around the abdomen of the disposable diaper.

As shown in Fig. 4 (a) and (b), the front outer casing 1a and the rear outer casing 2a are provided with an outer sheet 10 on the outermost layer on the non-direct contact surface side of the skin. Further, in the front outer body 1a and the rear body outer body 2a, the outer sheet 10 is folded back at the direct contact surface of the skin at the reverse line 11a of the upper end edge to form the folded portion 11. The reverse fold line 11a of the folded-back outer sheet 10 corresponds to the upper end portion of the front outer body 1a and the rear body outer body 2a, and becomes the opening edge of the waist opening portion 5 when the disposable diaper combination is completed. The folded-back portion 11 of the outer sheet 10 extends in the vertical direction, for example, at a length that does not reach the position where the knitted fabric worsted stretchable material 21 is disposed.

As shown in Fig. 4 (a) and (b), in the front outer body 1a and the rear body outer body 2a, a plurality of waist stretch materials 20 and a plurality of plain knit worsted fabrics are stretched on the outer sheet 10. The material 21 is disposed in a stretched state in the direction along the fold line 11a. The number of the waist stretchable members 20 may be two or more, and for example, it may be two to fifteen, four to twelve, or six to nine. Further, a plurality of imitation knitted worsted elastic members 21 are attached to the outer sheet 10 below the waist stretchable material 20. The number of the imitation knitted worsted material 21 can be, for example, 10 to 30, 15 to 25, or 18 to 20. A plurality of waist stretch materials 20 and a plurality of plain knitted worsted materials 21 are arranged side by side at a regular interval in the longitudinal direction of the disposable diaper as shown in Fig. 4 (a) and (b). As shown in the exploded view of Fig. 2, a plurality of waist stretch members 20 and a plurality of plain knit worsted stretch members 21 are stretched to extend to the front outer body 1a and the rear body outer body 2a. It is preferable to arrange the side seal portions 4 at the left and right end portions. The plurality of waist stretchable members 20 and the plurality of plain knitted worsted stretchable materials 21 may be fixed by coating or spraying with an adhesive having a high fluidity like a hot melt adhesive. However, in the portion joined by the side seal portion 4, it is preferable that a plurality of waist stretch members 20 and a plurality of plain knitted worsted materials 21 are not present. This is because if the waist elastic material 20 or the knitted fabric worsted material 21 is present in the side seal portion 4, the left and right outer casings 1a and the rear body outer casing 2a are left and right in the side seal portion 4. When the side is joined, heat generated by heat sealing or ultrasonic sealing causes dissolution of various elastically stretchable members, and the joint between the front and outer body 1a and the left and right sides of the rear body exterior body 2a is unstable. .

Further, as shown in Fig. 4 (a) and (b), the sheet 13 is formed by disposing the folded portion 11 formed by reversing the outer sheet 10 and the plurality of waist stretch members 20 with the cushion. Preferably. The buffer forming sheet 13 is intended to improve the cushioning and softness of the waist wrinkles. And the configuration of the sheet. It is preferable that the cushion forming sheet 13 is formed by using a nonwoven fabric. The non-woven fabric of the buffer-forming sheet 13 may be a hydrophilic non-woven fabric or a water-repellent non-woven fabric. The cushion forming sheet 13 is preferably formed by intermittently joining the skin on the direct contact surface side with respect to the inward surface (the skin non-contact surface side) of the folding portion 11 in the direction of the fold line 11a. The term "intermittently bonded" means that the joint portion and the non-joining portion are continuously formed at a constant interval. By intermittently joining the cushion forming sheet 13 and the folded-back portion 11 along the fold line 11a, when the waist stretch material 20 or the plain knitted fabric stretchable material 21 is contracted, the sheet 13 and the folded portion 11 are cushioned. A space is created between which the cushioning and softness of the waist wrinkles can be improved. The cushion forming sheet 13 is formed to extend in the upper and lower directions of the diaper, and the buffer forming forming sheet 13 extends to the position of the reverse line 11a of the outer sheet 10 at the upper end side, and the lower end side of the cushion forming sheet 13 is overlapped with the inner sheet. The skin of 12 directly touches the side. However, the cushion forming sheet 13 does not have a length reaching the lower end of the inner sheet 12.

Further, a disposable diaper having the cushion forming sheet 13 as described above is disclosed in Japanese Laid-Open Patent Publication No. 2011-254996.

As shown in Fig. 4 (a) and (b), the inner sheet 12 is located on the skin direct contact surface side of the outer sheet 10. The inner sheet 12 is interposed between the outer sheet 10 and a part of the plurality of waist stretchable members 20 and a plurality of plain knitted worsted materials 21 are sandwiched and fixed. Although the inner sheet 12 does not reach the upper end edge of the outer sheet 10, it is formed to reach the length of the lower end portion of the outer sheet 10. The inner sheet 12 may also be one in which a portion of the upper side is overlapped with the cushion forming sheet 13. Further, the inner sheet 12 may be overlapped with the cushion forming sheet 13 and the folded portion 11 of the outer sheet 10 at one portion of the upper side.

As described above, the front body exterior body 1a and the rear body exterior body 2a are formed by overlapping a plurality of sheets. For example, in the embodiment of the present embodiment, the first laminate portion 71 at the uppermost portion of the front outer casing 1a and the rear outer casing 2a is superposed on the outer sheet 10 from the non-direct contact surface side of the skin. The sheet 13 and the folded-back portion 11 of the outer sheet 10 are formed. Further, in the second laminated portion 72 located at the lower portion of the first laminated portion 71, the outer sheet 10, the inner sheet 12, the cushion forming sheet 13, and the outer sheet 10 are superposed on each other from the non-direct contact surface side of the skin. Reverse folding portion 11. Moreover, the third laminate portion 73 located below the second laminate portion 72 overlaps the outer sheet 10, the inner sheet 12, and the buffer-forming sheet 13 in order from the non-direct contact surface side of the skin. Furthermore, the fourth laminate portion 74 at the bottom of the front outer body 1a and the rear body outer body 2a, The outer sheet 10 and the inner sheet 12 are double-stacked in this order from the non-direct contact surface side of the skin. As described above, in the side seal portion 4, the number of sheets in which the front outer casing 1a and the rear outer casing 2a overlap may be different depending on the parts.

As described above, the plurality of sheets are stacked to form the front outer body 1a and the rear outer body 2a joined to the side seal portions 4 at the left and right end portions. In other words, the left and right side portions of the front outer casing 1a and the rear outer casing 2a are joined to each other, and a pair of side edges are formed on both side portions of the front outer casing 1a and the rear outer casing 2a. Sealing portion 4. The joining method of the front outer body 1a and the rear body outer body 2a is preferably performed using, for example, heat sealing or ultrasonic sealing.

(2-1, main joint area)

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

Fig. 4(c) is an enlarged plan view showing an end portion of the outer body 1a and the rear body exterior 2a before the side seal portion 4 is joined. The cross-sectional view of Fig. 4(a), the cross-sectional view of Fig. 4(b), and the plan view of Fig. 4(c) are all shown in such a manner that the dimensions in the vertical direction are the same. In particular, Fig. 4(c) shows an embodiment in which the joint pattern is formed in the main joint region 40 of the side seal portion 4. The joint pattern of the main joining region 40 is not limited to that shown in Fig. 4(c).

As shown in Fig. 4(c), the main joining region 40 extending linearly in the vertical direction of the diaper is divided into two regions of the upper upper joint region 40a and the lower lower joint region 40b. In Fig. 4(c), the upper joint region 40a and the lower joint region 40b are indicated by a broken line in the lateral direction. The upper joint region 40a and the lower joint region 40b do not need to divide the main joint region 40, and the upper joint region 40a may be formed longer than the lower joint region 40b as shown in Fig. 4(c), or may be reversed. Referring to Fig. 4(a), Fig. 4(b), and Fig. 4(c), the upper joint region 40a and the lower joint region 40b have different numbers of laminated sheets. That is, the upper joint region 40a has more laminated sheets than the lower joint regions 40b. For example, in the embodiment shown in FIG. 4, the upper joint region 40a is the first laminate portion 1a, the second laminate portion 72, and the third laminate portion 73. Engage. Therefore, in the upper joint region 40a, when the number of sheets constituting the front outer casing 1a and the rear outer casing 2a is totaled, six or eight sheets are overlapped and joined. On the other hand, in the embodiment shown in Fig. 4, the lower joint region 40b joins the front outer casing 1a and the rear outer casing 2a to the fourth laminate portion 74. Therefore, in the lower joint region 40b, if the number of sheets constituting the front body outer casing 1a and the rear body outer casing 2a is totaled, four sheets are used. The sheets are overlapped and joined.

However, in the main joining region 40, the number of sheets joined by the upper joining region 40a and the lower joining region 40b is not limited to the above. That is, as long as the upper bonding region 40a is above the lower bonding region 40b, the number of sheets in the number of the lower bonding regions 40b is overlapped and joined, and the lower bonding region 40b is located below the upper bonding region 40a. It is preferable that the number is less than or equal to the number of sheets in the upper joint region 40a to overlap the joint.

As shown in Fig. 4(c), the upper joint region 40a forms a region of a plurality of upper relief portions 41a, and the lower joint region 40b forms a region of a plurality of lower relief portions 41b. 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. As an example shown in Fig. 4(c), the upper relief portion 41a is formed in three rows. In the plurality of rows of the upper relief portion 41a, the distance from the left end row to the right end row is the width of the upper joint region 40a. Similarly, in the lower joint region 40b, a plurality of lower relief portions 41b are formed in a plurality of rows along the vertical direction of the diaper. As shown in Fig. 4(c), the lower relief portion 41b is formed in three rows. In the plurality of rows of the lower relief portion 41b, the distance from the left end row to the right end row is the width of the lower joint region 40b. It is preferable to form a plurality of columns of the upper embossed portion 41a and the lower embossed portion 41b in the upper joint region 40a and the lower joint region 40b, and for example, it may have four columns to ten columns. Further, the number of the upper embossed portions 41a and the lower embossed portions 41b may be different.

Here, as shown in FIG. 4(c), the width B1 of the lower joint region 40b in the left-right direction of the diaper is formed to be wider than the width Bu of the upper joint region 40a (B1>Bu). For example, the value of the width B1 of the lower joint region 40b is 105% to 150%, 110% to 145%, 115% to 140%, or 120% to 135% with respect to the value of the width Bu of the upper joint region 40a. It is better. In particular, the lower joint region 40b is preferably increased in width in both the left and right directions of the diaper with respect to the upper joint region 40a. Specifically, for example, when the width Bu of the upper joint region 40a is 2 mm to 20 mm, 4 mm to 15 mm, or 5 mm to 10 mm, the width B1 of the lower joint region 40b is 3 mm to 30 mm, 5 mm to 20 mm, or 6 mm to 15 mm. It is better. Thus, by making the width B1 of the lower joint region 40b wider than the width Bu of the upper joint region 40a, the number of joined sheets can be increased by the lower joint portion 40b, and the joint strength can be increased with the number of joints. Strong joint of area 40a Achieve a balance. Therefore, the hardness of the upper joint portion 40a and the lower joint portion 40b is made uniform, and as a result, the overall feel of the side seal portion 4 (particularly, the main joint portion 40) becomes good. Further, since the lower joint region 40b has a small number of joined pieces, the joint portion has a tendency to be easily peeled off when the diaper is worn, but the width of the lower joint portion 40b is enlarged and the strength is increased, so that the diaper can be prevented from being worn. Stripping. Further, by enlarging the width of the lower joint region 40b, it is possible to increase the strength of the joint without enlarging the area of the lower embossed portion 41b itself, so that the diaper can be easily torn when the diaper is wet or dirty. Sealing portion 4.

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

Fig. 5 is a further enlarged view showing the enlargement of the frame of the broken line shown in Fig. 4(c). Fig. 5 is a view showing the arrangement relationship between a plurality of upper relief portions 41a and a plurality of lower relief portions 41b. As shown in Fig. 4, the upper relief portion 41a and the lower relief portion 41b are formed in three rows, and the middle rows thereof are located on the same straight line. On the other hand, the left end row and the right end row of the lower embossed portion 41b are formed at a position where the left end row and the right end row of the upper embossed portion 41a are expanded outward in the left-right direction of the diaper. Therefore, the width B1 of the lower joint region 40b is wider than the width of the upper joint region 40.

As shown in Fig. 5, it is preferable that each of the upper relief portions 41a and each of the lower relief portions 41b is formed in a short line extending in the left-right direction of the diaper. The "short-line" upper relief portion 41a means that at least the left-right direction length Lu of the upper relief portion 41a is longer than the upper-lower width portion Wu of the upper relief portion 41a, and the length Lu is the upper joint region 40a whose width Bu value is Less than half. Similarly, the "short-line" lower relief portion 41b means that the length L1 of the lower relief portion 41b in the left-right direction is longer than the width W1 of the lower relief portion 41b in the vertical direction, and the value of the length L1 is the lower junction region 40b. One or more of the width B1 value is less than half. As described above, the upper embossed portion 41a and the lower embossed portion 41b are formed in a short line shape, and when the diaper is wet or dirty, the side seal portion 4 (particularly, the main joint portion 40) can be easily torn. 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 tearing the diaper can be guided to the outside of the diaper. Therefore, by forming the upper embossed portion 41a and the lower embossed portion 41b in a short line shape, the wearer can force the diaper to tear the diaper in one go, and the side seal portion 4 can be easily torn.

Further, each of the upper relief portions 41a and the lower relief portions 41b are formed The area is the same as the same. In particular, the length Lu of the upper embossed portion 41a is the same as the length L1 of the lower embossed portion 41b, and the width Wu of the upper embossed portion 41a and the width W1 of the lower embossed portion 41b are preferably the same. For example, in the form shown in Fig. 5, the length Lu of the upper relief portion 41a and the length L1 of the lower relief portion 41b are preferably 0.5 mm to 10 mm, 1 mm to 5 mm, or 1.5 mm to 3 mm. Further, it is preferable that the width Wu of the upper relief portion 41a and the width W1 of the lower relief portion 41b are both 0.2 mm to 5 mm or 0.4 mm to 3 mm. In the present embodiment, as described above, the joint strength of the lower joint region 40b can be ensured by enlarging the width B1 of the lower joint region 40b. Therefore, even if the joint area of the lower relief portion 41b forming the lower joint region 40b is the same as the joint area of the upper relief portion 41a forming the upper joint region 40a, the joint strength of the lower joint region 40b can be ensured. Further, by making the joint area of the lower relief portion 41b the same as the joint area of the upper relief portion 41a, when the urine is wet or dirty, the upper joint region 40a and the lower joint region can be easily separated by a continuous operation. 40b torn.

In Fig. 5, the symbol Su indicates the interval between the adjacent upper relief portions 41a in the left-right direction in the upper joint region 40a. As shown in Fig. 5, the interval Su in the left-right direction of the adjacent upper relief portions 41a is preferably equal to all. In particular, it is preferable that the interval Su in the left-right direction of the adjacent upper relief portions 41a is equal to the length Lu of the upper relief portion 41a (Su = Lu).

In addition, the symbol S1 indicates the interval between the adjacent lower relief portions 41b in the left-right direction in the lower joint region 40b. As shown in Fig. 5, the interval S1 between the adjacent lower relief portions 41b in the left-right direction is preferably equal to all.

Further, when the interval S1 between the interval Su and the lower relief portion 41b is compared between the upper relief portions 41a, the value of the interval S1 is preferably larger than the value of the interval Su (S1>Su). For example, the value of the interval S1 of the lower relief portion 41b is 110% to 200%, 120% to 180%, or 130% to 160%, to 140%, with respect to the value of the interval Su of the upper relief portion 41a. ~150% is preferred. As described above, in the present invention, the interval S1 of the lower relief portion 41b is ensured to be wider than the upper relief portion 41a, and as a result, the width B1 of the lower joint region 40b can be larger than the width of the upper joint region 40a. width.

As shown in Fig. 5, by making the width B1 of the lower joint region 40b wider than the width Bu of the upper joint region 40a, in the lower joint region 40b, in the left and right direction In the outermost row, a plurality of lower joint regions 40b are formed so as to protrude outward in the left-right direction from the width of the upper joint region 40a (see the drawing). In Fig. 5, the protruding portion O is indicated by oblique lines. It is preferable that the protruding portion O is formed in the lower joint region 40b which is formed in the outermost row in the left and right directions, respectively. For example, the length of the protruding portion O in the left-right direction is preferably 0.1 mm to 1 mm, 0.3 mm to 0.8 mm, or 0.5 mm to 0.6 mm.

In Fig. 5, the symbol Pu indicates the interval in the vertical direction of the plurality of upper relief portions 41a in a certain column. As shown in Fig. 5, the upper embossed portion 41a preferably has an interval Pu in the vertical direction.

Further, the symbol P1 indicates the interval between the plurality of lower relief portions 41b in a certain column in the vertical direction. As shown in Fig. 5, the interval P1 between the lower and lower relief portions 41b in the vertical direction is preferably equal to all.

Further, when the upper embossed portion 41a is compared with the interval P1 between the upper and lower embossed portions 41b in the vertical direction, the value of the interval P1 is preferably smaller than the value of the interval Pu (Pu>P1). For example, the value of the interval P1 in the vertical direction of the lower relief portion 41b is 50% to 95%, 55% to 90%, or 60% to 85% with respect to the value of the interval Pu in the vertical direction of the upper relief portion 41a. It is preferably 65% to 80%. In this manner, since the interval P1 between the lower and lower embossed portions 41b in the vertical direction is smaller than the interval Pu between the upper and lower embossed portions 41a in the vertical direction, the joint strength of the lower joint portion 40b can be increased, and the joint strength can be improved. The number of the plurality of upper joint regions 40a is balanced by the joint strength. Therefore, the hardness of the upper joint region 40a and the lower joint region 40b can be made uniform, and as a result, the overall feeling of the side seal portion 4 becomes good.

As shown in Fig. 5, in the upper joint region 40a, the positions of the adjacent upper embossed portions 41a are preferably shifted upward from each other above and below the diaper. In Fig. 5, the symbol Du indicates a distance between the upper and lower ends of the upper portion of the relief portion 41a and the central portion of the upper portion of the relief portion 41a. For example, it is preferable that the upper relief portion 41a has a shift distance Du such that one or more of the interval Pu in the vertical direction of the plurality of upper relief portions 41a in a certain row is about one-half.

Similarly, in the lower joint region 40b, the positions of the adjacent lower relief portions 41b are preferably shifted upward from each other above and below the diaper. In Fig. 5, reference numeral D1 denotes a distance in which the rows of the relief portions 41b located below the left and right ends are offset from the rows of the relief portions 41b located below the center. For example, the displacement of the lower relief portion 41b by the distance D1 is preferably about one-half of the interval P1 in the vertical direction of the plurality of lower relief portions 41b in a certain row.

In the above-described joint pattern in the main joining region 40, a plurality of main embossing portions 41 are arranged at intervals in the vertical direction to form a plurality of rows, and a pattern in which the plural rows are spaced apart in the left-right direction will be described as an example. However, the joint pattern in the main joining region 40 is not limited to the above embodiment. For example, the joint pattern in the main joining region 40 may be a straight line extending in the vertical direction. Further, the main embossed portion 41 forming the main joining region 40 may be a vertically long shape parallel to the side end edge of the diaper. Further, the main embossed portion 41 may have an inclination of 1 to 45 degrees, or about 2 to 30 degrees with respect to the side edge of the diaper. As described above, by tilting the main embossed portion 41 as described above, the linear load can be increased, so that the joint strength can be maintained, which is advantageous in a state in which the joint is desired to be stabilized.

(2-2, secondary joint area)

Next, the sub-joining region 50 included in the side seal portion 4 will be described in detail.

Fig. 6 is an enlarged view showing the inside of the broken line frame shown in Fig. 3. That is, the enlarged view shown in Fig. 6 indicates the upper portion of the main joint region 40 and the upper portion of the sub-joining region 50.

As shown in FIG. 6, the side seal portion 4 includes a main joint region 40 and a sub-joining region 50. In the present embodiment, the main joining region 40 is a strip-shaped region extending in the vertical direction at intervals in the vertical direction and the horizontal direction as described above. Further, as shown in Fig. 6, the outer edge of the main joining region 40 and the front end outer casing and the side ends 4a of the left and right sides of the rear outer casing have a white residue S. As described above, by providing the whitening S between the main joining region 40 and the side end 4a, it is possible to prevent the main contact region 40, which is hard to touch the skin, from exposing the side end 4a, and directly contacting the wearer's skin. Further, the trouser type diaper generally has a plurality of continuous sheets laminated, and is joined by two pairs of main joining regions 40, and each trouser type diaper is obtained by cutting therebetween. Therefore, if there is no space between the main joining regions 40, it is impossible to cut between the main joining regions 40 at the time of cutting, and the main joining region 40 is cut. As a result, the degree of unevenness in the joint strength of the main joining region 40 becomes large. Here, as described above, by providing the margin S between the main joining region 40 and the side end 4a, the continuous sheet between the two main joining regions 40 can be more surely cut. From this point of view, it is preferable to set the length of the left-white S in the left-right direction to be at least 3 mm to 20 mm or 5 mm to 10 mm. However, if there is a white residue S between the main joining region 40 and the side end 4a, the left and right end portions of the front outer casing and the rear outer casing become wandered and loosened, and the appearance of the entire diaper deteriorates. Therefore, in the present invention, in the portion S which exists between the main joining region 40 and the side end 4a, The sub-joining region 50 is formed, and the left and right end portions of the front outer casing and the rear outer casing are prevented from being loosened by gently joining the portions of the white S so as not to impair the sensation of the diaper. .

The purpose of the joining in the sub-joining region 50 is to prevent the left and right end portions of the front outer casing and the rear outer casing from being peeled off and fixed when worn, and to be the left and right outer casings and the rear outer casing The ends are gently joined for the purpose of not being loosened. Therefore, the joint strength of the sub-joining region 50 is set to be lower than the joint strength of the main joining region 40. For example, when the joint strength of the sub-joining region 50 is 100%, the bonding strength of the sub-joining region 50 is preferably 50% or less, more preferably 30% or less, and still more preferably 15% or less. For example, the joint strength of the sub-joining region 50 may be 1% to 50%, 1% to 30%, or 1% to 15%, compared to the joint strength of the main joining region 40.

The trouser-type disposable diaper is designed to be able to pull one or both of the left and right side portions when the diaper is removed. In order to reproduce this operation, the "joining strength" is obtained by stretching the main joining region 40 and the sub-joining region 50 in the direction of 180 degrees from the inner side of the diaper by a tensile strength tester, and the maximum strength is used as the joint strength.

That is, in the present specification, the "joint strength" is a tensile strength measured by the method described below.

First, the portions including the main joining region 40 and the sub-joining region 50, which are the measuring targets of the joint strength, are each cut into a certain shape (left-right direction: 25 mm × up-and-down direction: 30 mm) as a test piece for the main joint region. And a sub-joining area test piece. Next, the main joint area test piece facility was placed in a tensile strength tester (trade name: Strago V. Str. V1-B, manufactured by Toyo Seiki Seisakusho Co., Ltd.). The main joint area test piece is set by centering the main joint area 40, and the main joint area test piece is spread left and right, and the both ends of the expansion are clamped and fixed by the clip member from the upper and lower sides. Here, the distance between the left and right fasteners is 20 mm. In this state, the tensile tester was operated, and the tensile strength of the main joint region test piece was measured by stretching the main joint region test piece in the left-right direction. Here, the stretching speed was 200 mm/min, and the measurement was ended when the main joining region test piece was broken. Next, the maximum tensile strength was confirmed from the measured map. The maximum tensile strength is referred to as "joining strength" in the present specification. In the sub-joining region 50, the joint portion of the main joining region 40 is peeled off to the S2 region in FIG. 6 in advance, and the joint strength of the joining strength with the main joining region 40 can be measured.

Specifically, the bonding strength of the main bonding region 40 is preferably 5.0 N/25 mm or more, as specified by numerical values. For example, the bonding strength of the main bonding region 40 is preferably 5.0 N/25 mm to 30.0 N/25 mm. If the joint strength of the main joining region 40 is less than 5.0 N/25 mm, the joint strength is too low, and when the side edge side of the diaper is pulled up while wearing the diaper, the main joining region 40 is peeled off and the entire diaper is torn. Hey. On the other hand, if the joint strength of the main joining region 40 exceeds 30.0 N/25 mm, the joint portion may come into contact with the skin and feel pain. Furthermore, although the side portion of the diaper must be torn in order to facilitate the removal of the trouser-type disposable diaper from the wearer, if the joint strength of the main joint region 40 exceeds 30.0 N/25 mm, the side edges are not easily torn. The Ministry of the Ministry.

On the other hand, the bonding strength of the sub-bonding region 50 is preferably 50% or less, 30% or less, or 15% or less with respect to the bonding strength of the main joining region 40. For example, the bonding strength of the sub-bonding region 50 is preferably 0.75 N/25 mm to 15.0 N/25 mm. When the joint strength of the sub-joining region 50 is less than 0.75 N/25 mm, the joint strength is too low, and the sub-joining region 50 is easily peeled off due to the action of the wearer, and the provision of the sub-joining region 50 becomes meaningless. On the other hand, when the joint strength of the sub-joining region 50 exceeds 15.0 N/25 mm, the total joint width of the main joining region 40 and the sub-joining region 50 becomes long, and it is inconvenient to use force when tearing. Further, when the joint strength of the sub-joining region 50 exceeds 15.0 N/25 mm, the skin contact feeling of the sub-joining region 50 becomes hard, and there is a pain in contact with the wearer's skin.

As described above, the method of setting the joint strength of the sub-joining region 50 to be weaker than the joint strength of the main joining region 40 can be various.

In order to set the joint strength of the sub-joining region 50 to be weak, for example, it is conceivable that (A) the joint area of the sub-joining region 50 is smaller than the joint area of the main joining region 40, and (B) the sub-joining region 50 is made lower and downward. The plurality of sub-relief portions 51 arranged side by side have a total length in the vertical direction which is shorter than the length of the main joining region 40, and (C) the depth of each of the sub-embossing portions 51 of the sub-joining region 50, and the main reliefs of the main joining region 40. The portion 41 has a shallow depth. Hereinafter, the example in which the bonding strength of the sub-bonding region 50 is weakened will be described. However, the sub-joining region 50 of the present invention is not limited thereto.

In the above (A), in order to set the joint strength of the sub-joining region 50 to be weak, the joint area of the sub-joining region 50 may be made smaller than the joint area of the main joining region 40. That is, the area of the sub-relief portion 51 provided in the sub-joining region 50 is the same as the area of the main embossed portion 41 provided in the main joining portion 40, as long as the embossed pattern of the sub-joining region 50 is in the up-and-down direction. The interval between the intervals or the left-right direction is wider than the relief pattern of the main joint region 40, and the joint strength of the sub-joining region 50 can be weakened.

For example, in Fig. 6, the symbol Ps indicates the interval between the vertical and downward directions of the plurality of sub-embossed portions 51 of a certain column. As shown in Fig. 6, the interval Ps between the sub-relief portions 51 in the vertical direction is preferably wider than the interval Pu between the main embossed portions 41 (the upper embossed portions 41a) in the vertical direction. For example, the interval Ps between the sub-relief portions 51 in the vertical direction is preferably 200% to 1000% or 300% to 600% with respect to the distance Pu between the main relief portions 41 in the vertical direction. Further, in Fig. 6, reference numeral D2 denotes a distance in which the sub-relief portion 51 located in a certain column is shifted in the lower direction from the sub-relief portion 51 located in the adjacent row. As described above, when the columns of the sub-relief portions 51 are shifted, the offset distance Ds is preferably wider than the interval Pu between the main embossed 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.

Further, in Fig. 6, the symbol Gs indicates the distance between the two embossed portions 51 in the left-right direction. As shown in Fig. 6, the row of the sub-relief portions 51 is spaced apart from the left-right direction by Gs, and is preferably wider than the left-right direction of the main relief portion 41 by the gap Gs. For example, the distance between the sub-relief portions 51 in the left-right direction is Gs, and the distance between the main relief portions 41 in the left-right direction is preferably 120% to 500%, or 150% to 300%. In this manner, by arranging the embossed pattern in the sub-bonding region 50 at intervals or in the left-right direction, the embossed pattern in the main bonding region 40 is wider than the embossed pattern in the main bonding region 40, so that the bonding area of the sub-joining region 50 can be made smaller than that of the main bonding region 40. The joint area is small.

Specifically, the sub-joining region 50 preferably has a joint area ratio which is smaller than the main joining region 40. The joint area ratio of the so-called sub-joining region 50 referred to herein is the ratio of the total area of the plurality of sub-embossed portions 51 to the entire area of the sub-joining region 50. Similarly, the joint area ratio of the main joining region 40 is the ratio of the total area of the plurality of main relief portions 41 to the entire area of the main joining region 40. The overall area of the main joint region 40 and the sub-joining region 50 can be obtained by using the width in the embossed portion from the innermost edge at the innermost side to the outermost edge at the outermost side. Stretch the banded area to form. Furthermore, the total area of the plurality of main relief portions 41 and the total area of the plurality of secondary relief portions 51 can be multiplied by the area of each relief portion by the primary joint region 40 or the secondary joint region. The number of relief parts of the field 50 is obtained. Therefore, the joint area ratio of the sub-joining region 50 is calculated, and the joint area ratio is preferably 1% to 50% with respect to the main joining region 40, and preferably 1% to 30%, particularly 1%. 15% is ideal. Further, the area of one sub-embossed portion 51 is preferably about 50% to 200% with respect to the area of one main relief portion 41, and more preferably 70% to 150%.

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

In the above (B), in order to set the joint strength in the joint region 50 to be weak, the lengths of the plurality of sub-relief portions 51 arranged in the vertical direction of the sub-joining region 50 may be increased in the vertical direction, which is larger than the main joint region 40. Short. That is, in the present specification, since the "joint strength" is as described above, it is defined as the tensile strength at which the main joining region 40 and the sub-joining region 50 are stretched from the inner side of the diaper in a 180-degree direction. Since the total length of the plurality of embossed portions arranged in the vertical direction is longer in the vertical direction, the joint strength is strong, and the total length is shorter, which means that the joint strength is weak. Here, the term "the total length of the plurality of embossed portions arranged in the vertical direction in the vertical direction" refers to a plurality of embossed portions on the imaginary line when the imaginary line extending in the vertical direction is parallel to the side 縁 of the disposable diaper. The total length of the sides in the up and down direction. Further, when the sides of the upper and lower heights of the embossed portions are not parallel to the imaginary line, the length of each of the embossed portions on the imaginary line is cut in the vertical direction. For example, the total length of the plurality of sub-relief portions 51 arranged in the vertical direction in the sub-joining region 50 in the vertical direction is the total length in the vertical direction of the plurality of main embossed portions 41 arranged in the vertical direction with respect to the main joining region 40. It is preferably 1% to 50%, 1% to 30%, or 1% to 15%.

In the above (C), in order to set the joint strength of the sub-joining region 50 to be weak, the depth of each of the sub-relief portions 51 in the sub-joining region 50 may be made deeper than the depth of each of the main embossed portions 41 of the main joining region 40. shallow. When the side seal portion 4 is formed by heat sealing or ultrasonic sealing, the height of the pattern block used for heat sealing or ultrasonic sealing is actually subjected to so-called cylindrical grinding processing, and the same height is applied. The surface is formed by a curved surface such as a cylindrical surface. Therefore, the relief pattern disposed on the pattern block temporarily becomes equal. After the embossed pattern is processed at the same height, each of the sub-joining regions 50 is further formed. The pattern block of the sub-embossed portion 51 is polished to lower the height of the pattern block. For example, the height of the pattern block forming the sub-embossed portion 51 is preferably 3 μm or more lower than the height of the pattern block forming the main relief portion 41. For example, the height of the pattern block forming the sub-embossed portion 51 is preferably about 3 μm to 100 μm or 5 μm to 50 μm lower than the height of the pattern block forming the main relief portion 41. The pattern block forming the sub-embossed portion 51 may have a height which is gradually higher toward the pattern block forming the main relief portion 41. Thereby, the depth of each of the sub-relief portions 51 of the joint region 50 formed in the side seal portion 4 can be shallower than the depth of each of the main embossed portions 41 in the main joint region 40. When the depth of each of the sub-relief portions 51 is made shallow, as a result, the joint strength of the sub-joining region 50 is weakened. Furthermore, by adjusting the depth of each of the sub-embossed portions 51, the embossed pattern of the primary bonding region 40 and the embossed pattern of the secondary bonding region 50 may be the same as long as the bonding strength of the secondary bonding region 50 can be set to an appropriate range. pattern.

Further, in the above description, the embossed pattern of the sub-joining region 50 is compared with the embossed pattern of the main joining region 40, but in the embossed pattern of the sub-joining region 50 and the embossed pattern of the main joining region 40, It is possible to have different joint strength depending on the area. For example, the ratio of the joint area ratio of the embossed pattern of the sub-joining region 50 to the embossed pattern of the main joining region 40 or the vertical direction of the embossed portion may vary depending on the portion. As described above, when the sub-joining region 50 and the main joining region 40 have a plurality of joint area ratios, the interval between the embossed portions in the vertical direction, and the interval between the left and right directions, the sub-joining region 50 is compared with the main joining region 40 as long as it is trimmed. It is sufficient to carry out a predetermined portion adjacent to the direction. For example, as described in the measurement method of "joining strength", the sub-joining region 50 is compared with the main joining region 40 as long as it is cut in a predetermined portion adjacent to the left-right direction (left-right direction: 25 mm × vertical direction: 30 mm). can.

Further, as shown in FIG. 6 , the plurality of sub-embossed portions 51 are arranged in a plurality of rows in the vertical direction, and a plurality of columns of the sub-embossed portions 51 are offset from each other. It is preferable to form the space in the left-right direction. Further, each of the sub-embossed portions 51 has a length in the left-right direction of 2 mm to 5 mm, and a length in the vertical direction of 0.3 to 5 mm is preferable. Further, the interval between the sub-relief portions 51 in the upper and lower directions is preferably 5 mm to 50 mm.

Further, it is preferable that the sub-joining region 50 is formed at a position within 5 mm from the side end 4a of the left and right side portions of the diaper. That is, it means that it is in the sub-joining area 50. Any of the sub-relief portions 51 provided is disposed within 5 mm from the side edge 4a of the diaper. For example, in Fig. 6, the distance between the outermost jaw of the sub-joining region 50 and the side ends 4a of both side portions of the diaper is indicated by symbol S1. The distance S1 is preferably within 5 mm. Thus, by forming the sub-joining region 50 within 5 mm of the side end 4a of the diaper, even if the front and outer body and the rear body outer body are wound up at the left and right ends, the maximum width of the rolled portion can be controlled Within 5mm, it has an effect. Further, as will be described later, the sub-joining region 50 may reach the side end 4a of the diaper, and the distance S1 is 0 mm. Since the sub-joining region 50 is lower in bonding strength than the main joining region 40, even if the cross section of the sub-embossed portion 51 of the diaper side end 4a is exposed, the skin contact feeling of the side end 4a of the diaper can be prevented from being poor. occur.

Further, as shown in Fig. 6, it is preferable that the main joining region 40 and the sub-joining region 50 have a region (non-joining region) having no joint portion. In Fig. 6, the non-joining region existing between the main joining region 40 and the sub-joining region 50 has a width indicated by a symbol S2. For example, the width S2 of the non-joining region is preferably 0.5 mm to 4 mm, or 1 mm to 3 mm, and more preferably 1.5 mm or more. Thereby, when the disposable diaper is torn, the sub-joining region 50 is easily peeled off when the side seal portion 4 is peeled off. That is, when the side seal portion 4 is peeled off, it is generally peeled off from the inside of the diaper to the outside. Therefore, the main joining region 40 is peeled off first, and then the rear sub-joining region 50 is peeled off. Here, by the non-joining region between the main joining region 40 and the sub-joining region 50, the user tears the side seal portion 4, tearing the main joining region 40, and further directly in the non-joining region. The secondary joining region 50 is reached and the secondary joining region 50 is torn. Therefore, the user can feel the tear of the side seal portion 4 easily. In the present invention, since the side seal portion 4 has the main joint region 40 and the sub-joining region 50, the width of the entire side seal portion 4 is widened compared to the side seal portion having no sub-joining region 50 in the related art. At this point, as described above, the non-joining region is provided between the main joining region 40 and the sub-joining region 50, and by providing the feeling that the user easily tears the side seal portion 4, the generation of the sub-joining region 50 can be eliminated. The side seal portion 4 is not easily torn.

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

Next, a step of forming the side seal portion which is performed in the method of manufacturing the pants type disposable diaper will be described with reference to Fig. 7. The step of forming the side seal portion is basically performed in the final stage of the manufacturing method of the pants type disposable diaper. Fig. 7 is a conceptual diagram showing the final stage of the manufacturing method of the pants type disposable diaper.

As shown in Fig. 7, according to a general manufacturing method, a plurality of diaper continuous bodies 100' in which the disposable diapers are connected in the left-right direction are obtained (step S1). The diaper continuous body 100' is connected to the front side seal portion 4 at a position where the side seal portion 4 is expected to be formed in the left-right direction to form the continuous body 1a', and the plurality of back body outer casings are It is expected that the position where the side seals 4 are formed is connected in the left-right direction to become the continuous body 2a'. Further, in the diaper continuous body 100', the absorbent body 3a is disposed so as to be perpendicular to the continuous body 1a' of the front outer casing and the continuous body 2a' of the rear outer casing. Here, in the diaper continuous body 100', the side seal portion 4 is intended to be formed at a position so as not to be coated with a heat-fusible adhesive for fixing the waist stretch material 20 and the plain knitted stretch fabric 21 to the outer body. The agent is better. That is, the hot-melt adhesive is intermittently applied along a part of the left-right direction (flow direction) of the diaper continuous body 100', and the intermittent portion 110 is adjusted to coincide with the predetermined formation position of the side seal portion 4. Thereby, there is no elastically stretchable material in the portion where the side seal portion 4 is to be formed, and there is no hot-melt adhesive for fixing the stretchable member.

Next, the diaper continuous body 100' is folded in the up-and-down direction in the region where the lower body of the absorbent body 3a is disposed (step S2). Thereby, the continuous body 1a' of the front body exterior body and the continuous body 2a' of the back body exterior body are superposed on each other. At this time, the intermittent portion 110 formed on the side of the continuous body 1a' of the front outer casing conforms to the position of the intermittent portion 110 formed on the side of the continuous body 2a' of the rear outer casing.

Next, the diaper continuous body 100' in which the front body and the back body are superposed is formed into a side seal 4 (step S3). When the side seal portion 4 is an individual pants type disposable diaper 100, it is formed at a position corresponding to the left and right side portions of the front body and the back body. Here, as shown in Fig. 7, the side seal portion 4 is formed on the right side portion of a pair of pants type disposable diapers, and is formed on the left side portion of another adjacent pants type disposable diaper, two Formed side by side. The two side seal portions 4 are formed at a time, that is, they mean that two embossed patterns are engraved on the pattern block of the embossing roller that performs heat sealing or ultrasonic sealing. Therefore, two side-by-side side seal portions 4 can be formed by introducing the diaper continuous body 100' between the embossing roller and the anvil roller as described above, and rotating the embossing roller and the anvil roller only one turn. Here, as shown in the enlarged view of the side seal portion 4 of Fig. 7, each of the side seal portions 4 has the main joint region 40 as described above, and is disposed closer to the predetermined cut line than the main joint region 40 ( The sub-joining area 50 of the chain line). As shown in the enlarged view of Figure 7, the two sides The edge seal portions 4 are formed in a state in which the respective sub-joining regions 50 are adjacent to each other. That is, between the two sub-joining regions 50, the position of the predetermined nipple (chain line) of the diaper continuous body 100' is obtained.

Thereafter, the diaper continuous body 100' forming the side seal portion 4 is cut along the predetermined cutting line (chain line) positioned between the two side seal portions 4 in the vertical direction (step S4). That is, the diaper continuous body 100' is cut at the boundary of the two sub-joining regions 50. Thereby, the individual diaper-type disposable diaper 100 can be cut from the diaper continuous body 100'. Through the above steps, the pants-type disposable diaper 100 of the present invention can be manufactured.

(2-4, other relief patterns of the side seals)

Next, referring to Fig. 8 (a), Fig. 8 (b), Fig. 9 (a), and Fig. 9 (b), a pattern different from the embossed pattern shown in Fig. 3 and the like will be described. The embossed pattern shown in Figs. 8 and 9 is different from the pattern of Fig. 3 and the like, and at least two of the plurality of sub-embossed portions 51 formed in the sub-joining region 50 reach the front body 1 and the back body 2 The side 4a of the left and right sides. As shown in Figs. 8 and 9, the plurality of sub-embossed portions 51 reach the side ends 4a of the left and right sides of the front body 1 and the back body 2, so that the side ends 4a of the left and right sides can be more reliably prevented. open.

Specifically, in the relief pattern of Fig. 8(a), a plurality of sub-embossed portions 51 of a nearly elliptical shape are arranged in a row along a predetermined cutting line (chain line) of the diaper continuous body. Therefore, by cutting the diaper continuous body along the predetermined cutting line, the plurality of sub-relief portions 51 on the predetermined cutting line are divided into two. Thereby, in the sub-joining region 50 of each of the side seal portions 4, the separated sub-embossed portions 51 reach the side ends 4a of the left and right sides of the diaper.

As shown in Fig. 8(b), the sub-joining region 50 is formed by a plurality of sub-relief portions 51 having a short line shape, and the sub-joining region 50 is concentrated in the vicinity of a predetermined cutting line (chain line). Further, on the predetermined cutting line, a plurality of sub-embossed portions 51 having a short line shape are also arranged in a row in the vertical direction. In the embossed pattern shown in Fig. 8(b), the rows of the sub-relief portions 51 arranged on the predetermined cutting line are displaced in the vertical direction from the adjacent sub-relief portions 51.

The relief pattern of Fig. 9(a) is a modification of the relief pattern of Fig. 8(c). In the relief pattern shown in Fig. 9(a), the sub-relief portion disposed on the predetermined cutting line In the list of 51, all of the sub-relief portions 51 adjacent to the position are displaced from each other in the vertical direction.

In the embossed pattern shown in FIG. 9(b), the plurality of sub-embossed portions 51 having a long line shape in the long-axis direction in the left-right direction are crossed over a predetermined cutting line (chain line), and are vertically moved along a predetermined cutting line. Configured as a column. The long-line-shaped sub-relief portion 51 has a length in the left-right direction of 3 mm to 15 mm, preferably 5 mm to 10 mm. The long line-shaped sub-relief portion 51 is divided into two sub-joining regions 50 by cutting the diaper continuous body along a predetermined cutting line. According to the embossed pattern shown in Fig. 9(b), it is possible to more reliably prevent the side of the both sides of the disposable diaper from being rolled up.

The above description of the relief pattern in the side seal portion 4 will be described by way of an example. However, in the present invention, the embossed pattern of the side seal portion 4 is not limited to the above-described form, and those skilled in the art can appropriately change the above-described form within the obvious range.

(3, absorber body)

Finally, the structure of the absorber body 3a supported by the front body exterior body 1a and the rear body exterior body 2a will be described.

The absorbent body 3a is supported between the front outer body 1a and the rear body outer body 2a in a state of being joined, and when the disposable diaper 100 is worn, it is placed under the wearer's lower jaw, and the absorbent support wearer excretes. Liquid such as urine. The absorbent body 3a is disposed across the front body 1 and the back body 2 centering on the lower portion 3 of the disposable diaper.

As shown in Fig. 2, the absorbent body 3a has a basic composition of the absorbent body 31, the topsheet 32, the rear side panel 33, and a pair of three-dimensional wrinkles 34.

The absorbent body 31 is a member that absorbs liquid such as urine and serves to support the absorbed liquid. The absorbent body 31 is disposed between the liquid-permeable surface sheet 32 and the liquid non-penetrating side sheet 33. The absorbent body 31 has a function of absorbing liquid passing through the surface sheet 32, and is composed of an absorbent material. The absorbent material constituting the absorbent body 31 can be a conventional material. As the absorbent material, for example, a flap pulp, a superabsorbent polymer or a hydrophilic sheet can be used. Further, the absorbent material may be used alone or in combination of two or more kinds of sheet-like pulp, superabsorbent polymer or hydrophilic sheet. The absorbent material is generally formed by forming a single layer or a plurality of layers of mats. The shape of the absorbent body 31 can be appropriately designed in accordance with the shape, size, and use of the disposable diaper. For example, the shape of the absorber 31 may be an hourglass type as shown in Fig. 2. Furthermore, it can also be a rectangular or elliptical shape used in a general disposable diaper. Or gourd shape.

The topsheet 32 is in direct contact with the skin of the ankle of the wearer and is used to penetrate liquid such as urine into the member of the absorbent body 31. Therefore, the surface sheet 32 is composed of a highly liquid liquid penetrating material. Further, the topsheet 32 is disposed so as to cover the skin directly contacting the surface of the absorbent body 31. Examples of the non-penetrating material constituting the surface sheet 32 are woven fabric, non-woven fabric, or porous film. Further, for example, a fiber of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon may be hydrophilized to further form a nonwoven fabric.

The rear side panel 33 serves to prevent a member that penetrates the surface sheet 32 from being leaked by the absorbent body 31 to the outside of the diaper. Therefore, the rear side panel 33 is composed of a liquid non-penetrating material. Further, in order to prevent the liquid from leaking from the bottom surface of the absorbent body 31, the rear side sheet 33 covers the absorbent body 31 from the non-direct contact surface side of the skin. An example of the non-penetrating material constituting the rear side panel 33 is a liquid non-penetrating film composed of a polyethylene resin. In particular, it is preferred to use a microporous polyethylene film composed of a plurality of micropores of 0.1 to 4 μm.

A pair of three-dimensional wrinkles 34 are formed along the side edges of the absorbent body 31 to prevent leakage of the urine side leakage member. Each of the three-dimensional wrinkles 34 is provided with a three-dimensional wrinkle-expanding material 35 at its front end portion, and rises toward the skin contact direction of the wearer when the three-dimensional wrinkle-expanding material 35 contracts. Therefore, a pair of three-dimensional wrinkles 34 serves as a leakage preventing wall of the urine, and can prevent urine that does not penetrate the surface sheet 32 or urine that is not completely absorbed by the absorbent body 31 from the opening around the foot of the disposable diaper. The side leakage that leaks out. The three-dimensional wrinkles 34 can be constructed using conventional materials used in general disposable diapers. The three-dimensional wrinkles 34 can be formed, for example, by sandwiching and fixing the three-dimensional pleated stretchable material 35 in a stretched state between the layers of the water-repellent sheet. As the water-repellent sheet, a nonwoven fabric sheet obtained by a production method such as card emboss or spun-bounded can be used, and in particular, a non-woven sheet such as SMS or SMMS having high water repellency can be used. Preferably. Further, the three-dimensional pleated stretchable material 35 is generally made of a linear elastic rubber. The rubber material may be styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene-butadiene, polyoxyl, polyester. And other materials.

[Industrial Availability]

The present invention relates to a pants type disposable diaper for infants or elderly people. Therefore, the present invention is applicable to childcare and care related industries.

4‧‧‧Side seals

4a‧‧‧Edge

40‧‧‧Main joint area

40a‧‧‧Upper joint area

40b‧‧‧Bottom joint area

41‧‧‧Main relief department

41a‧‧‧Upper relief department

41b‧‧‧ Lower relief department

50‧‧‧Sub-joining area

51‧‧‧Deputy relief department

Claims (6)

A pants-type disposable diaper having a front body (1) attached to the wearer's abdomen, a back body (2) attached to the back of the wearer, and a lower jaw between the front body (1) and the back body (2) a portion (3), wherein the left and right side portions of the front body (1) and the left and right side portions of the back body (2) are respectively in a state of being overlapped, and a heat welding joint is formed by heat sealing or ultrasonic sealing. a pair of side seal portions (4); wherein the pair of side seal portions (4) have a main joint region (40) extending in the up and down direction; and located at a side closer to the main joint region (40) a sub-joining region (50) extending outward in the direction and extending in the up-and-down direction; the sub-joining region (50) is a row of embossed columns in which a plurality of sub-embossed portions (51) are arranged side by side in the vertical direction, by one or a plurality of columns In the formed region, the joint strength of the sub-joining region (50) is weaker than the joint strength of the main joining region (40). The pants type disposable diaper according to claim 1, wherein the joint strength of the sub-joining region (50) is 50% or less with respect to the main joining region (40). The pants type disposable diaper according to claim 1 or 2, wherein the main joining region (40) and the auxiliary joining region (50) are coated without using an adhesive and are only heat sealed. Or the heat welding generated by the ultrasonic sealing allows the front body (1) to be joined to the left and right sides of the back body (2). The pants type disposable diaper according to any one of claims 1 to 3, wherein at least two of the plurality of sub-relief portions (51) formed in the sub-joining region (50) are at least two or more , reaching the edge (4a) of the left and right sides of the front body (1) and the back body (2). The trouser type disposable diaper according to any one of claims 1 to 4, wherein the main joint region (40) is such that a plurality of main embossed portions (41) are arranged side by side in the up and down direction. a embossed column, a region formed by a plurality of collocations; the sub-joining region (50) is a embossed column in which a plurality of sub-relief portions (51) are arranged side by side in the vertical direction, and formed by a plurality of arranging columns Zone; the joint strength of the secondary joint zone (50) relative to the main joint The joint strength of the joint region (40) is 30% or less. A method of manufacturing a pants-type disposable diaper having a front body (1) attached to a wearer's abdomen, a back body (2) attached to a wearer's back, and a front body (1) and a rear a chin portion (3) between the body (2), the manufacturing method comprising the steps of: taking the plurality of connected diaper continuums in the left and right direction of the disposable diaper; and in the chin portion (3) a step of folding the diaper continuous body and overlapping the front body (1) and the back body (2); forming a heat welding joint between the left and right sides of the front body (1) and the back body (2) by heat sealing or ultrasonic sealing a joining step of the one-side sealing portion (4) on the left and right side portions; and a continuum of the diaper at a position corresponding to the side ends (4a) of the left and right sides of the front body (1) and the back body (2) Cutting the upper and lower sides to obtain a cutting step of the individual pants type disposable diaper; wherein the one-side sealing portion (4) formed in the joining step has a main joining region (40) extending in the up-and-down direction and a ratio The main joint region (40) is a sub-joining region (50) extending outward in the left-right direction and extending in the up-and-down direction; The sub-joining region (50) is a bonding strength ratio of the sub-joining region (50) by a plurality of sub-embossing portions (51) which are arranged side by side in a row of embossed columns which are arranged in a vertical direction by one or a plurality of arrangement. The joint strength of the main joining region (40) is weak; in the cutting step, the diaper continuous body is cut in the vertical direction in the boundary position between the two sub-joining regions (50).