JP2008079839A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper allowing a user to easily take out the male genital organ in urination. <P>SOLUTION: The disposable diaper comprises a chassis at least comprising a front body and a rear body in wearing; a liquid-permeable front surface sheet disposed in at least a part of the chassis; a liquid-impermeable rear surface sheet disposed on one side of the front surface sheet in the direction of thickness; and a liquid-retaining absorber disposed between the front surface sheet and the rear surface sheet. The front body of the chassis has an opening part formed by a line and/or a figure extending in the longitudinal direction of the disposable diaper and passing points separate from each other astride a nearly center line which divides the diaper into two sections in the cross direction, and an auxiliary sheet disposed to cover the opening part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disposable diaper. In particular, the present invention relates to a disposable diaper in which a male genital can be easily taken out.

  Conventionally, there are disposable diapers, training pants, incontinence pants, and the like as absorbent articles used by the elderly and disabled. All of these absorbent articles are properly used in accordance with the wearer's lifestyle and care level. For example, a disposable diaper can be used as an auxiliary tool for excretion, etc. by holding and absorbing the excrement without leaking it to people who are difficult to excrete by themselves, such as the elderly and disabled persons, or It is used as a hygiene product for nursing care.

  Here, disposable diapers are not only people who have difficulty in urinating on their own, but also those who can urinate on their own, such as people with disabilities such as mild incontinence and elderly people who can walk. It may be used even if it exists. However, people with disabilities who have mild incontinence or elderly people who can walk, have a sense of resistance to wearing diapers due to the impression that diapers are generally used by people who have difficulty urinating on their own. Often had. This is because the conventional diaper does not have the concept of making a hole in the diaper itself from the viewpoint of preventing leakage, and it is used to take out the male genitalia when urinating as is provided in ordinary male underwear It was because it did not have a mouth. Thus, when the wearer urinates, for example, an operation different from a general urination operation such as entering a private room and taking off a diaper is required. Such an action is a particularly troublesome action especially for male wearers, and gives more resistance to wearing a diaper.

  On the other hand, an absorbent article that enables a male genital to be taken out even when a paper diaper is worn is disclosed (for example, see Patent Document 1).

The absorbent article described in Patent Literature 1 includes an inner surface sheet, an outer surface sheet, and an intermediate sheet provided therebetween, and is positioned on the back side and the abdominal side portion positioned on the abdomen side of the wearer when worn. A paper diaper main body divided into a back side portion and a crotch portion therebetween, and an absorbent body attached to the crotch portion of the paper diaper main body. The inner and outer sheets of the ventral side are provided with perforations for forming an opening through which the male genitals can be removed when worn, and the opening of the inner and outer sheets is removed by removing the fastening material and shifting the intermediate sheet The parts communicate with each other so that a through-hole can be formed in the ventral part. As a result, the male genital can be taken out even when the disposable diaper is worn.
JP 2005-80996 A

  However, the paper diaper disclosed in Patent Document 1 has an opening for taking out the genitals on the inner surface and the outer sheet of the ventral side portion, but this opening has a configuration of only an opening, so the opening is not provided. There was a problem that it was difficult to spread. In addition, this disposable diaper requires various operations to remove the male genitalia from the opening when the wearer urinates. For example, when removing the male genitalia, it is necessary to remove the fixing member of the intermediate sheet in order to shift the intermediate sheet. Such an action makes it difficult for a wearer who can use only one hand due to paralysis or the like to urinate on his own. Furthermore, when the intermediate sheet is removed from the fastening member, there is a risk of generating a specific sound. As a result, there is a possibility that it is noticed that a disposable diaper is worn around the patient during urination, and the resistance to using the disposable diaper is increased.

  This invention is made | formed in view of the above subjects, and it aims at providing the disposable diaper which can take out a male genitalia easily at the time of urination.

  In order to achieve the above object, the present inventor provides an opening for urination at a predetermined position of the disposable diaper and makes a predetermined portion of the disposable diaper extendable so that urination can be facilitated. As a result, the present invention has been completed. Specifically, it aims at providing the following disposable diapers.

  (1) A chassis having at least a front body and a rear body at the time of wearing, a liquid-permeable surface sheet disposed on at least a part of the chassis, and disposed on one side in the thickness direction of the surface sheet A liquid-impermeable back sheet, and a liquid-retaining absorbent disposed between the top sheet and the back sheet, wherein the front body of the chassis includes: An opening formed by a line and / or a figure that extends in the longitudinal direction of the disposable diaper and passes through each of the points separated from each other across a substantially central line that bisects the width direction, and is provided so as to cover the opening. A disposable diaper having an auxiliary sheet.

  (2) The absorber is formed in a substantially vertically long shape and is disposed at least in the front body, and the opening is formed at a position away from a predetermined outer edge of the absorber in the front body. The disposable diaper according to (1).

  (3) The disposable diaper includes a body opening and a pair of leg openings by joining or locking the front body and the back body of the chassis in a predetermined position in advance or when attached. The disposable diaper according to (1) or (2), wherein the chassis in the pant shape is formed so that at least a part thereof can be expanded or contracted or extended.

  (4) The chassis in the pant shape has a substantially center in the back body of the trunk opening and a vicinity of the crotch part on the crotch direction side of the openable part along the trunk circumference of the chassis in the pant shape. The disposable diaper according to (3), further including an opening stretchable region formed by connecting together, the opening stretchable region being formed such that at least a part thereof can be stretched or stretched.

  (5) The disposable diaper according to (4), wherein an expansion ratio at the time of expansion in the opening expansion / contraction region in a range from 1.1 times to 4.0 times.

  (6) When the length of the trunk circumference in the non-stretched area of the opening stretchable region is 100%, the length of the trunk circumference of the stretchable opening area is at least 150% of the length of the trunk circumference in the non-stretched state. The disposable diaper as described in (4) whose tensile stress at the time of making it extend until becomes 20N or less.

  (7) The chassis in the pant shape includes an elastic boundary region formed in the whole or part of the boundary including the joining or locking position of the front body and the back body, and the elastic boundary region is The disposable diaper according to any one of (3), wherein at least a part of the disposable diaper is formed to be stretchable or stretchable.

  (8) The disposable diaper according to any one of (1) to (7), wherein the auxiliary sheet includes an elastic member in whole or in part.

  (9) The auxiliary sheet is a disposable diaper according to any one of (1) to (8), in which an absorbent member is disposed in whole or in part.

  (10) The disposable diaper according to any one of (1) to (9), wherein a hole or a curved portion having a predetermined shape is provided at both ends of the opening.

  (11) The disposable diaper according to any one of (1) to (10), wherein a reinforcing member having high rigidity is disposed at both ends of the opening.

  (12) The disposable diaper according to any one of (1) to (11), wherein a guide sign indicating the presence of the opening is provided in the vicinity of the opening.

  (13) The disposable diaper according to (12), wherein the guide sign suggests the presence of the opening by giving a color.

  (14) The disposable diaper according to (12), wherein the guide sign suggests the presence of the opening by unevenness.

  (15) The disposable diaper according to any one of (1) to (14), wherein an opening assisting tool is provided on the crotch portion side of the opening.

  ADVANTAGE OF THE INVENTION According to this invention, the disposable diaper which can take out a male genitalia easily at the time of urination can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, embodiment of this invention is not limited to the following embodiment at all, and the technical scope of this invention is not limited to this. For example, in the present embodiment, a disposable diaper for adults will be described. However, the present invention is not limited to this, and a disposable diaper for child toilet training may be used.

  Moreover, in the following embodiment, let the side orient | assigned to a wearer's body among disposable diapers be the skin contact surface side, and let the opposite side to the skin contact surface side be a non-skin contact surface side.

  FIG. 1 is an exploded perspective view of the disposable diaper according to the first embodiment of the present invention in an unfolded state. FIG. 2A is a front view of the disposable diaper according to the embodiment. FIG. 2B is a cross-sectional view taken along the line XX in FIG. FIG. 3A is a perspective view showing a wearing state of a pants-type disposable diaper. FIG. 3B is a perspective view showing a state where the unfolded disposable diaper is attached. FIG. 4A is a development view showing the arrangement of the elastic members of the disposable diaper according to the embodiment. FIG. 4B is a front view of the disposable diaper of FIG. 5A to 5E are front views showing the opening according to the embodiment. FIG. 6A is a front view showing the positional relationship between the opening and the absorber or the like. FIG. 6B is a development view showing the positional relationship between the opening and the absorber or the like. FIG. 7A is a perspective exploded view showing a masking sheet as an auxiliary sheet. FIGS. 7B and 7C are perspective exploded views showing other forms of the masking sheet. FIG. 8A is a perspective developed view showing a masking sheet on which an absorbent member is arranged. FIG. 8B is a YY cross-sectional view of FIG. FIGS. 9A to 9F are front views showing the bonding state of the masking sheet.

  FIGS. 10A to 10E are partial cross-sectional views showing the bonding state of the masking sheet. 11A and 11B are front views showing the arrangement positions of the elastic members in the vicinity of the opening. FIG. 12A is a perspective view showing an opening / contraction region of the disposable diaper according to the first embodiment. FIG. 12B is a diagram illustrating a state in which the opening is widened by extending the opening stretchable region. FIG. 13A is a perspective view showing an elastic back body region of the disposable diaper according to the first embodiment. FIG. 13B is a diagram illustrating a state in which the opening is widened by extending the elastic back body region. FIG. 14A is a perspective view showing an elastic boundary region of the disposable diaper according to the first embodiment. FIG. 14B is a diagram illustrating a state in which the opening is widened by extending the elastic boundary region. FIG. 15 is a perspective view showing a wearing state of the disposable diaper according to the first embodiment. FIG. 16: is a perspective view which shows the state which opened the opening part of the disposable diaper which concerns on 1st Embodiment. FIG. 17 is a perspective view showing a wearing state of the disposable diaper according to the second embodiment. FIG. 18 is a perspective view showing a state in which the opening of the disposable diaper according to the second embodiment is widened.

[1] First Embodiment [1.1] Overall Configuration A disposable diaper according to the present invention will be described using a pants-type disposable diaper 1 according to an embodiment of the present invention. As shown in FIGS. 1 and 2, the disposable diaper 1 includes a chassis 13 that forms the outer shape of the disposable diaper 1 and constitutes a front body 2, a back body 3, and a crotch portion 4 when worn, and a skin contact of the chassis 13. A liquid-permeable surface sheet 11 that is provided on the contact surface side and that is formed in a substantially vertically long shape constituting the surface layer, and a non-skin contact surface side of the chassis 13 that is one side of the surface sheet 11, and a back surface layer A liquid-impermeable back sheet 14 formed in a substantially vertically long shape, and a liquid-retaining absorbent body 12 disposed between the top sheet 11 and the chassis 13 and formed in a substantially vertical shape constituting an absorption layer. And having.

  The top sheet 11 and the absorbent body 12 are arranged from the front body 21 of the chassis 13 to the back body 22 through the crotch part 4 on the skin contact surface side of the chassis 13. Further, the back sheet 14 is disposed from the front body 21 of the chassis 13 to the back body 22 through the crotch portion 4 on the non-skin contact surface side of the chassis 13. Thereby, for example, excrement such as urine excreted from the excretion part of the wearer passes through the liquid permeation region in the top sheet 11 and is absorbed by the absorber 12, but is disposed on the non-skin contact surface side. Since the back sheet 14 is liquid-impermeable, excrement such as urine does not permeate the non-skin contact surface side and is held in the state of being absorbed by the absorbent body 12, and leakage to the outside is prevented. Is prevented.

  Here, you may arrange | position the absorber 12 in the state wrapped in the tissue (not shown) and the hydrophilic nonwoven fabric (not shown). For example, when wrapped in a hydrophilic non-woven fabric, a configuration in which the topsheet 11 is not used or a configuration in which the topsheet 11 is used only partially can be employed. Thereby, for example, it is possible to reduce the production cost. Furthermore, the back sheet 14 may be a non-skin contact surface side of the back sheet 14 bonded with a nonwoven fabric or the like. By bonding a non-woven fabric or the like to the non-skin contact surface side of the back sheet 14, the touch at the time of wearing of the wearer is improved, and when a film is used for the back sheet 14, the non-woven fabric is bonded to the film. This is because, for example, generation of unpleasant sound caused by film rubbing can be prevented.

  Note that the absorbent body 12 formed in a substantially vertically long shape includes, for example, a substantially rectangular shape having a longitudinal direction and a short side direction, and a width in which a part of a side extending in the longitudinal direction extends in the longitudinal direction. It may be recessed toward the direction center line C1, or a part of the side extending in the longitudinal direction may be raised in a direction opposite to the width direction center line C1 extending in the longitudinal direction. In other words, the absorbent body 12 may have a length in the width direction that is different from a part of the longitudinal direction of the absorbent body 12. Moreover, the absorber 12 may be arrange | positioned so that it may become vertically long in the width direction of the disposable diaper 1, and may be arrange | positioned so that it may become vertically long in the longitudinal direction of the disposable diaper 1. FIG.

  The front body 2 and the back body 3 include, for example, those that are distinguished by a substantially center line C2 that extends in the width direction in the deployed state of the disposable diaper 1 and bisects the longitudinal direction.

  An opening 5 is formed in the chassis 13 at a predetermined position of the front body 2 at the time of mounting. The opening 5 is formed substantially vertically so as to extend in the width direction of the disposable diaper 1 and is usually covered with a masking sheet which is an auxiliary sheet.

  The disposable diaper 1 formed in the underpants type in FIG. 2 (A) and (B) is shown. As shown in FIGS. 2A and 2B, the disposable diaper 1 according to the first embodiment includes a front body in side seal portions 8 and 8 which are joints in the front body 2 and the back body 3 of the chassis 13. 2 and the back body 3 are joined together by an ultrasonic seal or the like to form a pants shape. The disposable diaper 1 formed in a pants shape includes a front body 2 that is disposed on the wearer's abdomen when worn, a back body 3 that is disposed on the back of the wearer when worn, and the vicinity of the wearer's crotch The crotch part 4 is provided. Moreover, the disposable diaper 1 is formed in a pants shape, so that a torso opening 9 located around the wearer's torso in a worn state and a pair of leg openings 7, 7 located on each of the wearer's legs. And comprising. In addition, as another joining method in the side seal parts 8 and 8, joining by a heat seal, a hot-melt adhesive agent, etc. can be illustrated, for example.

  Examples of the length in the crotch direction of the disposable diaper 1 in a state before wearing formed in a pants shape (the maximum length in the crotch direction from the crotch portion 4 to the trunk opening 9) include 350 mm to 450 mm, for example. it can. Moreover, as a maximum length between each side seal part 8 and 8 in the expansion | deployment state of the direction (henceforth width direction) orthogonal to the crotch direction of the disposable diaper 1, 425 mm to 900 mm can be illustrated, for example. The unfolded state refers to a state where the front body 2 and the back body 3 are not joined as shown in FIG. Moreover, the maximum length is a length obtained by stretching the disposable diaper 1 in a state of being shrunk by an elastic force such as a thread-like elastic member described later or a stretchable base sheet in the width direction and the crotch or crotch direction. including.

  When using the disposable diaper 1 for children, for example, the length in the crotch direction of the disposable diaper 1 for children in a state before wearing formed in a pants shape can be exemplified from 200 mm to 300 mm. Moreover, as a maximum length between each side seal part 8 and 8 in the expansion | deployment state of the width direction of the disposable diaper 1 for children, 300 mm to 450 mm can be illustrated, for example.

  In the present embodiment, as shown in FIG. 3A, the front body 2 and the back body 3 are joined at predetermined side seal portions 8 and 8 to join the trunk opening 9 and the pair of leg openings. Although the disposable diaper 1 formed in the underpants type which has 7 and 7 is demonstrated, in this invention, it is not restricted to this. For example, as shown to FIG. 3 (B), you may use for the unfoldable disposable diaper 1A which can be worn by latching the front body 2 and the back body 3 with the latching member 8A. Further, for example, a hook-and-loop fastener that can be re-locked as used in the unfolded disposable diaper 1A at the predetermined side seal portions 8 and 8 of the front body 2 and the back body 3 of the disposable diaper formed in a pants shape. By providing a locking member such as a pants-type disposable diaper, it is possible to easily unlock the diaper and to deploy and re-lock the pant-type disposable diaper. Also good.

  Moreover, in this embodiment, although the back surface sheet 14 has been arrange | positioned at the non-skin contact surface side of the chassis 13, in this invention, it is not restricted to this. For example, the back sheet 14 may be disposed between the absorber 12 and the chassis 13. Moreover, when the chassis 13 is formed by laminating a plurality of sheet members, the back sheet 14 may be disposed between the respective sheet members.

  Furthermore, in this invention, the leak-proof wall formed using an elastic member and a leak-proof sheet, what is called a three-dimensional gather (not shown) is arrange | positioned along the both ends of the width direction of the absorber 12 of the disposable diaper 1. Also good. For example, a leak-proof sheet is provided so as to extend in the width direction of the absorber 12 from between the absorbent body 12 and the chassis 13 or the back sheet 14, and at least one or more at the width direction end of the leak-proof sheet. An elastic member may be disposed and fixed with a hot melt adhesive or the like. The leak-proof sheet may remain in the state of extending in the width direction of the absorbent body 12, and the folded portion is folded in the center direction in the width direction of the absorbent body 12 so that the folded portion is the skin contact surface of the absorbent body 12. It may be arranged on the side.

  In the case where the three-dimensional gather extends from the absorber 12 in the width direction of the absorber 12, the distance between the absorber 12 and the elastic member in the three-dimensional gather is approximately the central region in the longitudinal direction of the absorber 12. It is preferable that it exists in the range of 20 mm or more. Further, in the case where the three-dimensional gather is folded and arranged, the distance between the absorber 12 and the elastic member in the three-dimensional gather is 20 mm or more in a state where the three-dimensional gather leakage-proof sheet is widened in the substantially central region. It is preferable to be in the range.

  As shown to FIG. 4 (A) and (B), the elastic body which has stretch properties, such as a stretchable nonwoven fabric and a stretch film, is arrange | positioned at the front body 2 and the back body 3 of the chassis 13 of the disposable diaper 1. FIG. . Thereby, the disposable diaper 1 is provided with a stretching property or a stretching property. The disposable diaper 1 may be provided with stretchability or stretchability by disposing a thread-like elastic member on all or part of the front body 2 and the back body 3 of the chassis 13, for example, It is good also as providing stretchability or stretchability by arrange | positioning an elastic sheet in 2 and a part of back body 3. In this way, the disposable diaper 1 is made stretchable or stretchable by using, for example, the waistline that is the whole of the front body 2 and the backbody 3 of the chassis 13 or an elastic sheet or an elastic member for a part of the waistline. Prepare.

  As a part having stretchability or stretchability by an elastic sheet or the like, for example, the approximate center in the back body 3 of the trunk opening 9 and the vicinity of the crotch part 4 on the crotch direction side of the opening 5 are in a pants shape. It is sufficient that at least a part of the opening stretchable region 55 formed by connecting along the circumference of the chassis 13 extends or stretches. For example, the crotch direction side of the opening 5 that is a part of the opening stretchable region 55 It may be. Further, for example, the elastic boundary region 57 including all or part of the vicinity of the boundary portion including the connection position or the locking position with the front body 2 and the back body 3 may be used. Furthermore, the elastic back body area | region 56 containing all or one part of the back body 3 vicinity which is a part of the trunk | drum opening part 9 may be sufficient. The disposable diaper 1 should just be provided with at least any one of the opening expansion-contraction area | region 55, the elastic boundary area | region 57, and the elastic back body area | region 56, and may be provided with what combined each.

  Here, the disposable diaper 1 has an opening stretchable region when the length of the open stretchable region 55 when not stretched is 100% when the crotch portion 4 side of the opening 5 is pulled in the crotch direction with a tensile stress of 20N. The opening stretchable region 55 can be extended from 110% to 400% in length relative to the length of 55 when not stretched. Preferably, what can be extended from 150% to 400% can be used. This is because the opening 5 can be used as a male genital outlet when the opening 5 is opened if the length of the opening stretchable region can be extended to 110% or more. is there. Further, if the length of the opening stretchable region can be extended from 150% to 400%, the ease of use as a male genital outlet is improved.

  In addition, as the elastic sheet used for the chassis 13, for example, a sheet having an expansion / contraction ratio of 1.1 to 4.0 times when stretched with respect to a non-stretched state can be used. That is, the disposable diaper 1 uses an elastic sheet having a maximum expansion ratio of 1.1 to 4.0 times, or a chassis 13 that can expand or contract from a maximum expansion ratio of 1.1 to 4.0 times. Can do.

  The disposable diaper 1 has a so-called waistline gather formed by disposing a thread-like elastic member 91 in order to make the body opening 9 elastic in the circumferential region of the body opening 9. The waistline gather makes it possible to favorably maintain the wearing position and wearing state of the pants-type disposable diaper 1 during wearing, for example. The disposable diaper 1 is formed by arranging a thread-like elastic member (not shown) in order to make the portions along the leg openings 7 and 7 elastic in the peripheral region of the leg openings 7 and 7. You may have what is called leg gathers. Leg gathers make it possible to prevent leakage, for example, by properly tightening around the legs when worn. Here, the elastic member 91 may be thread-like or belt-like. Further, as the elastic member 91, for example, an elastic sheet having elasticity such as a stretchable nonwoven fabric (nonwoven fabric formed from a mixed fiber of polyurethane and polypropylene) or a stretchable film can be used.

[1.2] Opening [1.2.1] Shape As shown in FIG. 5, the opening 5 extends in the longitudinal direction of the disposable diaper 1 and has a substantially center line C <b> 1 (hereinafter, substantially centered) that bisects the width direction. It is formed by a line, a figure, or a combination thereof passing through each of the points separated from each other across the line C1. For example, as shown in FIG. 5A, the opening 5 can be exemplified by a substantially elliptical shape having a curved opening. In addition, the opening 5 is formed by a combination of a line passing through each of the points separated from each other across a substantially center line C1 that bisects the width direction and a figure as shown in FIG. 5B, for example. It may be. Specifically, those formed by a combination of an opening formed in a slit shape and an opening formed in an approximately elliptical shape can be exemplified. In the case where the opening 5 is formed by lines passing through each of the points separated from each other across the substantially center line C1 that bisects the width direction, or when both ends form an acute angle with respect to the horizontal, For example, it is preferable to provide holes 52 and 52 and reinforcing sheets 53 and 53 for improving the tear resistance and strength described later at both ends. This is because it is possible to prevent both ends of the opening 5 from being broken when the wearer pulls the opening 5.

  Further, the opening 5 divides the absorber 12 as shown in FIG. 5C, for example, and forms a region for providing the opening 5 between the absorbers 12. The opening 5 may be provided so as to be sandwiched between the two. Furthermore, as shown in FIG. 5D, a region for providing the opening 5 may be formed in a part of the absorber 12, and the opening 5 may be provided inside the absorber 12.

  Here, the opening 5 is formed at a position away from the outer edge of the absorber 12 in the front body 2. In other words, the opening 5 may be disposed, for example, at a position separated from the outer edge in the width direction of the absorbent body 12, for example, may be disposed at a position separated from the outer edge in the longitudinal direction of the absorbent body 12. For example, as shown in FIG. 5 (E), when a part of the absorber 12 is notched, the opening 5 is substantially parallel to the notched part of the absorber 12. You may arrange | position in the position spaced apart. That is, the opening 5 extends in the longitudinal direction of the disposable diaper 1 and has a predetermined angle with respect to the substantially center line C1 that bisects the width direction, for example, is formed in a curved or linear shape in an oblique direction. Also good. Further, the opening 5 may be a polygon or a substantially circular shape.

[1.2.2] Size As shown in FIG. 6A, the opening 5 is preferably in the waist region 23 of the front body 2. The waist circumference 23 includes the front body 2 and the back body 3 excluding the crotch portion 4 of the disposable diaper 1. The maximum length in the longitudinal direction of the opening 5 in the deployed state of the disposable diaper 1 is, for example, 100 mm or more, and the length in a range within 60% of the maximum length in the width direction in the deployed state of the disposable diaper 1 is exemplified. it can. Preferably, it is 120 mm or more, and the length in a range within 40% of the length in the width direction of the disposable diaper 1 can be exemplified. In order for the wearer to take out his / her male genitals, the length in the longitudinal direction of the opening 5 is required to be 100 mm or more, and the length of the opening 5 is the length in the width direction of the disposable diaper 1. If the length exceeds the range of 60%, it becomes difficult to wear disposable diapers, which makes it difficult to use. For example, when the length in the width direction of the disposable diaper 1 is 550 mm, the length of the opening 5 can be exemplified as 200 mm.

[1.2.3] Arrangement Position As shown in FIG. 6B, the arrangement position of the opening 5 is, for example, from the end of the trunk opening 9 to the approximate center line C3 in the longitudinal direction of the opening 5. The distance is a, and the distance from the approximate center line C3 in the longitudinal direction of the opening 5 to the approximate center line C2 (hereinafter referred to as the approximate center line C2) that extends in the width direction in the deployed state and bisects the longitudinal direction is b When the distance from the end of the trunk opening 9 to the approximate center line C2 is c, the value corresponding to b / a is preferably 0.65 or more and 8.0 or less.

  Specifically, in the opening 5, it is preferable that the distance “a” from the end of the trunk opening 9 to the substantially center line C <b> 3 in the longitudinal direction of the opening 5 is in the range of 50 mm to 270 mm. Moreover, it is preferable that the distance b from the approximate center line C3 in the longitudinal direction of the opening 5 to the approximate center line C2 in the unfolded state is in the range of 180 mm to 400 mm. Further, it is preferable that the distance c from the end of the trunk opening 9 to the substantially center line C2 in the unfolded state is in the range of 350 mm to 450 mm.

  Moreover, it is preferable that the opening part 5 is provided in the trunk | drum opening part 9 side rather than the absorber 12. FIG. That is, the opening 5 has a distance from the outer edge 41 in the longitudinal direction of the front body 2 of the absorber 12 to the substantially center line C2 in the unfolded state as d, and from the substantially center line C3 in the longitudinal direction of the opening 5 to the absorber 12 When the distance to the outer edge 41 in the longitudinal direction in the front body 2 is set to e, it is preferable that the value corresponding to b / d is in a range larger than 1.0 and smaller than 2.3. Specifically, the opening 5 preferably has a distance d from the outer edge 41 in the longitudinal direction of the front body 2 of the absorbent body 12 to the substantially center line C2 in the unfolded state in the range of 175 mm to 395 mm. Moreover, it is preferable that the distance e from the substantially longitudinal center line C3 of the opening 5 to the outer edge 41 in the longitudinal direction of the front body 2 of the absorber 12 is in the range of 5 mm to 225 mm.

  As a disposable diaper for children used by children, which is smaller than the disposable diaper 1 according to the first embodiment, the opening 5 has, for example, a substantially center line C3 in the longitudinal direction of the opening 5 from the trunk opening 9 end. Is preferably in the range of 35 mm to 180 mm. Moreover, it is preferable that the distance b from the approximate center line C3 in the longitudinal direction of the opening 5 to the approximate center line C2 in the unfolded state is in the range of 120 mm to 265 mm. Moreover, it is preferable that the distance c from the end of the trunk opening 9 to the substantially center line C2 in the unfolded state is in the range of 200 mm to 300 mm.

  Similarly, it is preferable that the distance d from the outer edge 41 in the longitudinal direction of the front body 2 of the absorbent body 12 to the substantially center line C2 in the unfolded state is in the range of 115 mm to 260 mm. The distance e from the lower end of the opening 5 to the outer edge 41 in the longitudinal direction of the front body 2 of the absorber 12 is preferably in the range of 5 mm to 150 mm.

[1.3] Masking Sheet As shown in FIG. 7A, the masking sheet 6 is formed by sandwiching a plurality of elastic members 63 formed in a thread shape between a pair of belt-shaped base sheets 61 and 61. . Specifically, it is formed by sandwiching a plurality of stretched elastic members 63 between base sheets 61, 61 such as non-woven fabric and bonding the base sheets 61, 61 with a hot melt adhesive or the like. After the masking sheet 6 is bonded, the tension of the elastic member 63 is released, so that a so-called gather is formed, and the masking sheet 6 can be extended by this gather. Thus, for example, when worn, the masking sheet 6 abuts against the wearer's abdomen by the elastic force of the elastic member 63 to prevent the wearer's skin from being exposed, but the wearer opens the opening 5. In this case, it follows the opening state of the opening 5 and can be expanded by the amount of gathers.

  The masking sheet 6 is bonded to the skin contact surface side or the non-skin contact surface side of the chassis 13 so as to cover the opening 5. Thereby, the length in the longitudinal direction of the masking sheet 6 should just be formed so that it may become longer than the length of the opening part 5 at least. That is, the disposable diaper 1 may have approximately the same length as the length in the width direction, or may be a length that can cover the opening 5.

  As shown in FIG. 7B, the masking sheet 6 may be formed, for example, by adhering an elastic member 64 and a base sheet 61 formed in a band shape. The masking sheet 6 may be formed, for example, by sandwiching a belt-like elastic member 64 between a pair of base material sheets 61 and 61 and bonding the base material sheets 61 and 61, respectively. Further, the masking sheet 6 may be formed, for example, by folding a single base sheet 61 and sandwiching the elastic members 63 and 64 therebetween. In addition, the masking sheet 6 is good also as a masking sheet 6 using substrate sheets, such as a stretchable nonwoven fabric, as a strip | belt-shaped elastic member.

  As shown in FIG. 7C, the masking sheet 6 is formed by laminating a liquid-impermeable sheet 65 such as a polyethylene (PE) or polypropylene (PP) film on a base sheet 61 such as a nonwoven fabric, for example. It may be formed. In the case where a plurality of substrate sheets 61 are laminated, a liquid-impermeable sheet 65 may be sandwiched between the substrate sheets 61 and 61.

  Further, as shown in FIGS. 8A and 8B, the masking sheet 6 is formed by removing an absorbent body 67 made of an absorbent material in a part or all of the masking sheet 6 and a liquid-impermeable sheet 66 covering the absorbent body 67. You may arrange | position to the skin contact surface side or the skin contact surface side. By providing the absorber 67 on all or part of the masking sheet 6, for example, even if urine leaks during the extraction of the male genitals, it is possible to absorb the urine leaked by the absorber 67 of the opening 5. Therefore, it is possible to prevent the clothes from becoming dirty.

  As shown in FIG. 9, the masking sheet 6 is joined to the chassis 13 by the joint portion 68 so as to cover the entire opening 5 formed in the front body 2. Here, as the joint portion 68 between the chassis 13 and the masking sheet 6, for example, as shown in FIG. 9A, the masking sheet 6 includes the crotch direction side of the opening 5 and both longitudinal ends of the masking sheet 6. All of the front body 2 may be joined to the chassis 13, for example, as shown in FIG. 9B, all of the front body 2 on the crotch direction side of the opening 5 and both end sides in the longitudinal direction of the masking sheet 6. And may be joined to the chassis 13. The masking sheet 6 may be joined to the chassis 13 so as to include a part of both ends of the opening 5. For example, as shown in FIG. 9C, the masking sheet 6 may be joined to the chassis 13 at at least a part of the crotch direction side of the opening 5 and the longitudinal direction both ends of the masking sheet 6, For example, as shown in FIG. 9 (D), the masking sheet 6 may be joined to the chassis 13 at at least a part of the crotch direction side of the opening 5 and the longitudinal direction both ends of the masking sheet 6. For example, as shown in FIG. 9 (E), the masking sheet 6 may be joined to the chassis 13 at a part of the crotch direction side of the opening 5 and at least a part of both ends of the masking sheet 6 in the longitudinal direction. Good. For example, as shown in FIG. 9F, the masking sheet 6 is joined to the chassis 13 at a part of the opening 5 on the crotch direction side and a part of the front body 2 on both ends in the longitudinal direction of the masking sheet 6. May be. Note that the joining portion 68 may be joined continuously to the chassis 13 or may be joined at a predetermined interval.

  FIG. 10 is a partial enlarged cross-sectional view showing a bonding state of the masking sheet 6 in the opening 5. As shown in FIG. 10A, the masking sheet 6 may be joined to the chassis 13 at a joint portion 68 provided on the crotch direction side of the opening 5 on the skin contact surface side of the chassis 13, for example, As shown in FIG. 10B, the masking sheet 6 may be joined to the chassis 13 at a joint portion 68 provided on the crotch direction side of the opening 5 on the non-skin contact surface side of the chassis 13. Furthermore, for example, as shown in FIG. 10C, the masking sheet 6 is joined to the chassis 13 at a joint portion 68 provided on the crotch direction side of the opening 5 on the skin contact surface side of the chassis 13. Well, for example, as shown in FIG. 10D, the masking sheet 6 is joined to the chassis 13 at a joint portion 68 provided on the crotch direction side of the opening 5 on the non-skin contact surface side of the chassis 13. Also good. As shown in FIG. 10E, when the masking sheet 6 is joined to the chassis 13 at the joint 68 provided on the crotch direction side of the opening 5 on the skin contact surface side of the chassis 13, The masking sheet 6 may be formed so as to cover the joint portion 68 with the top sheet 11.

  Thus, the masking sheet 6 includes the elastic member 63 in its entirety or in part. For example, when the masking sheet 6 is provided on the non-skin contact surface side of the opening 5, the chassis 13 in the opening 5. Can be brought into contact with the skin of the wearer and the skin of the wearer can be prevented from being exposed. Further, when the masking sheet 6 is provided on the skin contact surface side, the chassis 13 in the opening 5 can be drawn toward the wearer's skin side, and the wearer's skin and the like can be exposed. It becomes possible to prevent.

  As shown in FIG. 11 (A), the disposable diaper 1 has the masking sheet 6 joined on the trunk opening 9 side which is the crotch direction side of the opening 5 on the skin contact surface side of the chassis 13 (for example, 10A), it is preferable to provide an elastic member in at least a part of the crotch region 54a on the crotch part 4 side that is the crotch direction side of the opening 5.

  Moreover, as shown in FIG. 11 (B), the disposable diaper 1 is obtained when the masking sheet 6 is joined to the crotch portion 4 side which is the crotch direction side of the opening portion 5 on the skin contact surface side of the chassis 13 (for example, In FIG. 10C, it is preferable to provide an elastic member in at least a part of the crotch region 54b on the trunk opening 9 side, which is the crotch direction side of the opening 5.

  In this way, the opening 5 can connect the opening 5 as needed without exposing the skin of the wearer by joining the masking sheet 6 on which the elastic member is disposed to the chassis 13. Become.

[1.4] Others [1.4.1] Reinforcing Sheets A pair of reinforcing sheets 53 and 53 that are reinforcing members are provided at both ends of the opening 5 of the disposable diaper 1. The pair of reinforcing sheets 53 and 53 are formed in a substantially rectangular shape and are disposed between the chassis 13 and the masking sheet 6. For example, the chassis 13 and the masking sheet are bonded by hot melt bonding, heat sealing, ultrasonic sealing, or the like. 6 is joined. (See FIG. 1). When the chassis 13 is formed of a plurality of sheet members or the like, the reinforcing sheets 53 and 53 are arranged between any of the sheet members that form the chassis 13, and the reinforcing sheets 53 are formed from both sides of the sheet member. 53 may be joined or fixed.

  The reinforcing sheets 53 and 53 are made of, for example, a member such as a non-woven fabric or a film having a tear strength (measurement method: A-1 method (single tongue method) JIS L 1906) of 5 N or more in both the width direction and the longitudinal direction. Can be used. Examples of the size of the reinforcing sheets 53 and 53 include a size of 60 mm in the vertical direction (in the crotch direction) and 40 mm in the horizontal direction (in the width direction). The reinforcing sheets 53 and 53 may be formed in various shapes such as a circular shape, an elliptical shape, and a polygonal shape in addition to those formed in a rectangular shape.

[1.4.2] Holes Holes 52 and 52 are provided at both ends of the opening 5. The holes 52 and 52 are for tearing resistance to improve the strength. For example, when the wearer opens the opening 5, it is possible to disperse the tearing stress applied to both ends of the opening 5. become. Specifically, by providing the holes 52 and 52, it is possible to receive the tear stress generated at the end of the slit portion 5 not by the points but by the curved surfaces of the holes 52 and 52. , 52 can be torn and improved in strength as compared with the case where no. For example, the holes 52 and 52 may be circular, semicircular, or elliptical. That is, the hole parts 52 and 52 should just be provided with smooth curves, such as circular and an ellipse, in the longitudinal direction both ends of the slit part 5, ie, an outer side, for example.

  Furthermore, instead of the holes 52, 52, for example, an end of the opening 5 may include a curved portion (not shown) that curves in a direction different from the direction in which the opening 5 extends. The opening 5 can disperse the tearing stress by providing curved portions at both ends thereof. The curved portion may be a curved portion, or may be one in which the end of the opening 5 is bent linearly.

  In this way, by providing the holes 52 and 52 having smooth curves at both ends of the opening 5, it is possible to avoid tear stress from being concentrated on one point when the wearer opens the opening 5. It is possible to improve the strength against tearing. Also, by providing curved portions extending in a direction different from the direction in which the opening 5 extends at both ends of the opening 5 instead of the holes 52, 52, for example, tearing stress can be released in the tangential direction of the curved portion. Thus, it is possible to improve the strength against tearing.

[1.4.3] Opening aid A disposable diaper 1 according to the present invention is provided with a handle (not shown) which is an opening aid on the crotch 4 side or the trunk opening 9 side of the opening 5, for example. May be. As the handle portion, for example, a string-like or belt-like base sheet or the like may be joined to the front body 2 of the chassis 13, or a tongue-like protrusion may be provided. Thus, by providing the handle part which is an opening assistance tool, for example, the wearer can easily open the overlapping opening part 5 using the handle part. In addition, for example, even when worn by a person who needs care, the caregiver can easily open the overlapping opening portion 5 by pulling the handle portion, so that an assisting action such as urination of the patient is performed. Is also easier.

[1.4.4] Guide sign The disposable diaper 1 which concerns on this invention may provide a guide sign (not shown) in the vicinity of the opening part 5, for example. As a guide mark, for example, a color may be given to the crotch part 4 side of the opening 5 or the trunk opening 9 side, or the periphery of the opening 5. Thus, by attaching colors, for example, it is possible for the wearer to easily recognize the position of the opening 5, so that urination can be facilitated.

  Further, the guide sign may be attached with a symbol such as an arrow or a character. Thus, by attaching symbols and characters such as arrows, for example, when the caregiver or the like assists the wearer's urination as well as the wearer himself, the position and opening direction of the opening 5 can be determined. It can be easily opened without making a mistake.

  In addition, as a guide sign, for example, an unevenness process such as embossing is performed on the crotch part 4 side of the opening 5 or the trunk opening 9 side, or the periphery of the opening 5 or a substrate sheet having unevenness is used. You may join. In this way, by performing uneven processing on the peripheral area or the like of the opening 5, for example, the wearer can confirm the position of the opening 5 by simply touching the peripheral area or the like of the opening 5. Action can be facilitated.

[1.5] Usage Mode A usage mode of the disposable diaper 1 in the first embodiment of the present invention will be described.

  As shown in FIG. 15, the disposable diaper 1 in 1st Embodiment is formed in the underpants type, and a wearer is the disposable diaper which can wear and use similarly to normal pants. At the time of urination, the wearer inserts a finger or the like into the opening 5 and pulls it toward the crotch direction. At this time, since the reinforcing sheets 53 and 53 are provided at both ends of the overlapping opening 5, it is possible to prevent an opening having a predetermined length or more.

  When the disposable diaper 1 is provided with, for example, a string-shaped opening aid (not shown) on the crotch direction side of the opening 5, the wearer holds the opening aid, fingers, etc. The opening 5 may be opened by being hooked on the crotch and pulling the opening aid in the crotch direction. In addition, a guide sign such as a color is added to the vicinity of the opening 5, for example, the crotch direction side of the opening 5 or the crotch direction side of the opening 5, or an uneven nonwoven fabric or the like is disposed (see FIG. If it is not shown, the wearer can easily grasp the position of the opening 5.

  Next, the wearer further pulls a part of the opened opening 5 toward the crotch direction. As a result, as shown in FIG. 16, since the predetermined part of the chassis 13 extends in the direction in which the wearer pulls, the wearer can secure an opening of a size for taking out the male genital through the opening 5. The male genitals can be easily removed. Here, as a part where the chassis 13 extends, for example, the whole chassis 13 may extend, and a substantially central part of the back body 3 of the trunk opening 9 as shown in FIG. All or part of the opening stretchable region 55 that is a region connecting the substantially central portion of the front body 2 of the opening 5 along the outer periphery of the pants shape may be extended. As described above, when all or part of the opening expansion / contraction region 55 in the chassis 13 extends at least, for example, as shown in FIG. 12B, the opening formed by the opening 5 is in a direction in which the wearer pulls. It is possible to secure an opening that extends toward a certain crotch part 4 and allows the opening 5 to take out the male genitalia.

  Moreover, as another expansion-contraction site | part of the chassis 13 which can form the opening of the magnitude | size from which the opening part 5 can take out a male genitalia, as shown to FIG. 13 (A), for example, the trunk | drum opening part 9 vicinity is shown. The elastic back body area | region 56 formed by using the elastic member which can be expanded-contracted for the back body 3 can be illustrated. In this way, by making at least the elastic back body region 56 in the chassis 13 extendable, for example, as shown in FIG. 13B, the crotch where the opening formed by the opening 5 is the direction in which the wearer pulls. It becomes possible to ensure an opening that extends toward the portion 4 and from which the opening 5 can take out the male genitals.

  Furthermore, as other expansion and contraction parts of the chassis 13 in which the opening 5 can form an opening having a size that allows the male genitals to be taken out, as shown in FIG. 14A, for example, the front body 2 and the back body 3 can be exemplified by an elastic boundary region 57 formed by using an elastic member that can be expanded or contracted in the whole or part of the vicinity of the boundary portion including the joining or locking position. In this way, by forming at least the elastic boundary region 57 in the chassis 13 so as to be stretchable, for example, as shown in FIG. 14B, the crotch where the opening formed by the opening 5 is the direction in which the wearer pulls. It becomes possible to ensure an opening that extends toward the portion 4 and from which the opening 5 can take out the male genitals.

  The elastic back body region 56 and the elastic boundary region 57 may be stretchable by being used together with the above-described waistline gathers (not shown), and only the elastic back body region 56 or the elastic boundary region 57 may be stretched. It is good also as expansion-contraction by. Further, in the present embodiment, the leg gather described above is not provided, but a thread-like elastic member or a belt-like elastic member such as a stretchable nonwoven fabric or a stretchable film is attached to the leg opening 7 around the leg opening 7. You may arrange | position to the perimeter of this or a part thereof.

  Thus, the wearer can easily take out the male genitals even when the disposable diaper 1 is worn. For example, the wearer can take out the male genitals with one hand. Thereby, the wearer can urinate without taking off the disposable diaper 1 during urination. Moreover, since the opening direction (direction where a wearer pulls) in the opening part 5 is a direction toward the crotch part 4, and the opening part 5 is substantially vertically long extending in the width direction of the disposable diaper 1, for example, right Regardless of whether the person is a right-handed person or a left-handed person, the opening 5 can be easily opened to the crotch part 4 side.

  Furthermore, since the masking sheet 6 having elasticity is bonded to the skin contact surface side or the non-skin contact surface side of the opening 5, it can contact the wearer's abdomen at normal times and after urination. Therefore, it is possible to prevent the skin and male genitals from being exposed unnecessarily. Moreover, it becomes possible to improve a feeling of wearing by the elastic member provided in the masking sheet 6. Furthermore, since the opening 5 is only covered with the masking sheet 6, for example, it is possible to take out the male genital with one hand.

[2] Second Embodiment A disposable diaper 1B according to a second embodiment of the present invention will be described with reference to FIGS. 17 and 18. In the second embodiment, parts that are not particularly described are the same as those in the first embodiment, and the same reference numerals are given to the numbers given in the drawings if they are the same as those in the first embodiment.

  As shown in FIGS. 17 and 18, the disposable diaper 1 </ b> B according to the second embodiment is different from the first embodiment in the stretchable region of the chassis 13. Specifically, the disposable diaper 1 </ b> B according to the second embodiment differs from the first embodiment in providing an elastic boundary region 57 as an expansion / contraction region of the chassis 13.

  The disposable diaper 1B according to the second embodiment is a thread-like elastic member in the vicinity of the boundary including the joining or locking position of the front body 2 and the back body 3, or a belt-like elastic member such as a stretchable nonwoven fabric or stretch film. And an elastic boundary region 57 is provided. Thereby, as for the disposable diaper 1, in the front body 2 including the crotch direction and crotch direction of the opening part 5B, the tensile stress in the said part becomes smaller than the tensile stress of the other part. In other words, the elastic boundary region 57 has a larger tensile stress than the crotch direction side and the crotch direction side of the overlapping opening 5B, and the elastic boundary region expands and contracts when the wearer pulls the opening of the overlapping opening 5B. It becomes possible. In the leg openings 7 and 7, leg gathers formed by disposing a thread-like elastic member or a belt-like elastic member such as a stretchable nonwoven fabric or stretchable film are disposed on the entire circumference or a part thereof. May or may not be arranged. Similarly, also in the trunk opening 9, so-called waistline gathers may be arranged on the entire circumference or a part thereof, or may not be arranged.

  Thus, the disposable diaper 1B which concerns on 2nd Embodiment makes the tensile stress of the crotch direction side and crotch direction side of the opening part 5 smaller than the tensile stress in the other part. For example, it is set as the structure which does not arrange | position an elastic member in the crotch direction side and crotch direction side of the opening part 5, or arrange | positions an elastic member with a small expansion-contraction amount. Thereby, in the vicinity of the opening 5 in the disposable diaper 1B, the shrinkage (gather) in the width direction by the elastic member or the like is not formed or is smaller than other parts, so the length of the opening 5 is set to the maximum length. It is possible to keep in a state close to. Furthermore, since at least a part of the elastic boundary region 57 is expanded by the elastic force, the opening 5 can be easily expanded in the crotch direction, so that an opening of a predetermined size can be secured.

[3] Each component Each component of the disposable diaper 1 is demonstrated below.

[3.1] Surface Sheet The surface sheet 11 is disposed on the body side and in contact with the excretory part during use. The entire surface of the surface sheet 11 may be liquid permeable, or a part thereof may be liquid permeable. Moreover, it may be comprised by the sheet-like member of 1 sheet, and the some sheet-like member may adhere | attach and may be comprised.

As the top sheet 11, for example, a material that has a strength that does not break even when a load due to compression, twisting, friction, or the like is applied during wearing, and that does not irritate the skin, such as a woven fabric, a nonwoven fabric, or a perforated plastic sheet is preferable. For example, a sheet-like material having liquid permeability can be used. Examples of the non-woven fabric include those obtained by subjecting a hydrophobic fiber such as polyolefin or polyester to a hydrophilic treatment formed by a production method such as point bond, air through, or spun bond. Moreover, as a material of a nonwoven fabric, the material obtained from the range of 15 g / m < ² > to 35 g / m < ² > which has a fabric weight mainly including a natural fiber and a chemical fiber can be illustrated, for example. Examples of natural fibers include cellulose such as cotton. Examples of chemical fibers include semi-synthetic cellulose such as rayon, regenerated cellulose, acetate, and triacetate, thermoplastic hydrophobic chemical fibers, and thermoplastic hydrophobic chemical fibers that have been subjected to hydrophilic treatment. Examples of thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers formed by graft polymerization of polyethylene (PE) and polypropylene (PP), and core sheaths. Examples include composite fibers such as structures. Examples of the porous plastic sheet include a porous sheet made of a thermoplastic resin such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), and a porous foam material.

[3.2] Absorber The absorber 12 absorbs and holds discharged body fluid such as urine. Examples of the absorbent body 12 include a structure in which a superabsorbent polymer and a hydrophilic fiber are mixed and laminated, or a structure in which a superabsorbent polymer is fixed to a hydrophilic sheet with a hot melt adhesive or the like. May be. Examples of the superabsorbent polymer include polyacrylate-based and starch / acrylate-based absorptive polymers having a water absorption capacity of 20 g / g or more and a particle size of 100 μm to 800 μm. The thing which occupies 80% or more can be illustrated. Examples of hydrophilic fibers include pulverized pulp fibers and rayon fibers. Examples of the hydrophilic sheet include non-woven fabrics such as point bonds, air-throughs and spun bonds (weight per unit area: 15 g / m ² to 35 g / m ² ) formed by subjecting hydrophobic fibers such as polyolefins and polyesters to hydrophilic treatment. It can be illustrated.

[3.3] Chassis The chassis 13 constitutes the outer shape of the disposable diaper 1. The chassis 13 may be constituted by a single sheet-like member, or may be constituted by laminating a plurality of sheet-like members. In the present embodiment, the disposable diaper 1 includes a front body 2, a rear body 3, and a crotch portion 4 that is positioned between the front body 2 and the back body 3. The top sheet 11, the absorbent body 12 and the back sheet 14 are disposed on the top surface, but the present invention is not limited to this. For example, the chassis 13 may have the front body 2 and the back body 3, and the crotch part 4 having the top sheet 11, the absorber 12, and the back sheet 14 may be joined to the chassis 13 independently. In this case, the back sheet 14 and the chassis in the crotch portion 4 may be joined, or the back sheet 14 may have the role of the chassis 13.

For example, the chassis 13 is preferably made of a non-woven fabric or a perforated plastic material that has air permeability and has a strength that does not break even when subjected to a load caused by compression, twisting, friction, or the like during wearing. A sheet or the like can be used. Examples of the nonwoven fabric include those obtained by forming synthetic fibers such as polyolefins and polyesters by point bonds, air throughs, spun bonds and the like. Examples of the material of the nonwoven fabric include materials obtained mainly from natural fibers and chemical fibers and having a basis weight in the range of 15 g / m ² to 35 g / m ² . Examples of natural fibers include cellulose such as cotton. Examples of chemical fibers include semi-synthetic cellulose such as rayon, regenerated cellulose, acetate, and triacetate, thermoplastic hydrophobic chemical fibers, and thermoplastic hydrophobic chemical fibers that have been subjected to hydrophilic treatment. Examples of thermoplastic hydrophobic chemical fibers include single fibers such as polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET), fibers formed by graft polymerization of polyethylene (PE) and polypropylene (PP), and core sheaths. Examples include composite fibers such as structures.

[3.4] Back Sheet As the back sheet 14, for example, a thermoplastic film mainly composed of polyethylene (PE), polypropylene (PP), a breathable resin film, a non-woven fabric such as spunbond or spunlace, and the like is breathable. A plurality of resin films bonded together, SMS (spunbond / meltblown / spunbond) multiple layers, and the like can be used. Preferably, for example, a resin film mainly composed of a polyolefin resin and having a basis weight in the range of 10 g / m ² to 30 g / m ² is preferable.

[3.5] Elastic Member As the elastic member 91, for example, natural rubber or synthetic rubber such as styrene-butadiene, butadiene, or isoprene can be used. The sheet-like elastic member is formed from, for example, a polyurethane foam having a basis weight of 30 g / m ² to 80 g / m ² and a mixed fiber of polyurethane and polypropylene having a basis weight of 20 g / m ² to 70 g / m ^2. A nonwoven fabric or the like can be used.

[3.6] Adhesive The topsheet 11, the absorbent body 12, and the chassis 13 are joined together by being bonded together with a hot melt adhesive. Moreover, the surface sheet 11 and the absorber 12 are joined so that it may be bonded together with a hot melt adhesive. In addition, joining is not restricted to the said hot melt adhesion, For example, you may use a heat seal, an ultrasonic seal, etc. individually or in combination.

Examples of hot melt adhesives include SBS (styrene-butadiene-styrene copolymer), SIS (styrene-isobutylene-styrene copolymer), SEBS (styrene-ethylene-butylene-styrene copolymer), and SEPS (styrene-ethylene). -Propylene-styrene copolymer), APAO (Amorphous Poly Alpha Orefin) and the like as a base polymer can be exemplified. Examples of the coating pattern when bonded by hot melt bonding include spiral coating, control seam coating, coater coating, curtain coater coating, and summit gun coating. The basis weight of the adhesive in hot melt bonding is preferably 1 g / m ² to 30 g / m ² , and more preferably 3 g / m ² to 10 g / m ² . In the case of a pattern in which the adhesive is coated in a linear shape, the wire diameter is preferably 30 μm to 300 μm.

[3.7] Masking Sheet [3.7.1] Base Material Sheet As the base material sheet 61, either a liquid permeable sheet or a liquid impermeable sheet can be used. In the case of using a liquid permeable sheet, for example, the liquid permeable sheet exemplified as the top sheet 11 can be used. The base material sheet 61 may be a thin nonwoven fabric, such as a spunbond nonwoven fabric, a point bond nonwoven fabric, or a spunlace nonwoven fabric, and a nonwoven fabric having a basis weight of 10 g / m ² to 30 g / m ² is exemplified. it can. This is because the non-woven fabric having a small thickness increases the smoothness of the stretched state of the belt-like portion.

  In the case of using a liquid-impermeable sheet, for example, the liquid-impermeable sheet exemplified as the back sheet 14 can be used. The liquid-impermeable sheet may be on the skin contact surface side or on the non-skin contact surface side with respect to the elastic member 63.

[3.7.2] Elastic Member As the elastic member 63, the same one as the elastic member 91 described above can be used.

[3.7.3] Adhesive Spiral coating, control seam coating when a hot melt adhesive is used for joining the base sheet 61 and the elastic member 63 or joining the base sheets 61, 61 to each other. Coating is performed by a coating method such as coating, coater coating, curtain coater coating, summit gun coating, and the like, and an elastic member 63 is stacked thereon, and further, base material sheets 61 and 61 are stacked and bonded. be able to. In order to make it difficult for the elastic member 63 to be detached from the base sheet 61, the elastic member 63 may be applied in advance by a coating method such as slit coating or control seam coating. Moreover, joining is not restricted to the said hot melt adhesion, For example, you may use a heat seal, an ultrasonic seal, etc. individually or in combination.

  As the hot melt adhesive, the same one as described in the above-mentioned [3.6] adhesive can be used.

It is a perspective exploded view in the deployment state of the disposable diaper concerning a 1st embodiment. It is a figure which shows the disposable diaper which concerns on 1st Embodiment of this invention. It is a perspective view which shows the mounting state of a pants-type and a deployment-type disposable diaper. It is a figure which shows arrangement | positioning of the underpants type disposable diaper elastic member which concerns on the said embodiment. It is a front view which shows the opening part which concerns on the said embodiment. It is a figure which shows the positional relationship of a slit part and an absorber. It is a perspective view which shows the masking sheet which is an auxiliary sheet. It is a figure which shows the masking sheet which has arrange | positioned the absorptive member. It is a front view which shows the joining state of a masking sheet. It is sectional drawing which shows the joining state of a masking sheet. It is a front view which shows the arrangement position of an elastic member. It is a perspective view which shows the opening expansion-contraction area | region of the disposable diaper which concerns on 1st Embodiment. It is a perspective view which shows the elastic back body area | region of the disposable diaper which concerns on 1st Embodiment. It is a perspective view which shows the elastic boundary area of the disposable diaper which concerns on 1st Embodiment. It is a perspective view which shows the wearing condition of the disposable diaper which concerns on 1st Embodiment. FIG. 16 is a perspective view illustrating a state in which the opening of FIG. 15 is widened. It is a perspective view which shows the wearing condition of the disposable diaper which concerns on 2nd Embodiment. It is a perspective view which shows the state which expanded the opening part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Front body 3 Rear body 4 Crotch part 5 Opening part 6 Masking sheet 7 Leg opening part 8 Side seal part 9 Trunk opening part 11 Top sheet 12 Absorber 13 Chassis 14 Back surface sheet 52 Hole part 53 Reinforcement sheet 55 Opening expansion / contraction Area 56 Elastic back body area 57 Elastic boundary area

Claims (15)

A chassis having at least a front body and a rear body at the time of mounting, a liquid-permeable surface sheet disposed on at least a part of the chassis, and a liquid disposed on one side in the thickness direction of the surface sheet A disposable diaper comprising an impermeable back sheet, and a liquid-retaining absorbent disposed between the top sheet and the back sheet,
In the front body of the chassis, an opening formed by a line and / or a figure extending in the longitudinal direction of the disposable diaper and passing through each of the points separated from each other across a substantially central line that bisects the width direction, A disposable diaper having an auxiliary sheet provided to cover the opening. The absorber is substantially vertically long and is disposed at least in the front body,
The disposable diaper according to claim 1, wherein the opening is formed at a position separated from a predetermined outer edge of the absorbent body in the front body. The disposable diaper is a pants shape comprising a torso opening and a pair of leg openings by joining or locking the front body and the back body of the chassis in a predetermined position in advance or when attached. Can be formed
The disposable diaper according to claim 1 or 2, wherein at least a part of the chassis in a pant shape is formed to be stretchable or extendable. The chassis in the pant shape connects the approximate center of the trunk opening in the back body and the vicinity of the crotch part on the crotch direction side of the openable part along the circumference of the chassis of the chassis in the pant shape. Comprising an opening stretchable region formed by
The disposable diaper according to claim 3, wherein at least a part of the opening stretchable region is formed to be stretchable or stretchable.   The disposable diaper according to claim 4, wherein an expansion ratio at the time of expansion relative to a non-expansion region in the opening stretchable region is in a range of 1.1 to 4.0.   When the length of the trunk circumference when the stretchable area of the opening is not stretched is 100%, the length of the trunk circumference of the stretchable area of the opening is expanded to at least 150% of the length of the trunk circumference when not stretched. The disposable diaper according to claim 4, wherein the tensile stress is 20 N or less. The chassis in a pant shape includes an elastic boundary region formed in all or part of the vicinity of the boundary including the joining or locking position between the front body and the back body,
The disposable diaper according to claim 3, wherein at least a part of the elastic boundary region is formed to be extendable or contractible.   The disposable diaper according to any one of claims 1 to 7, wherein the auxiliary sheet includes an elastic member in whole or in part.   The disposable diaper according to any one of claims 1 to 8, wherein an absorbent member is disposed on all or part of the auxiliary sheet.   The disposable diaper according to any one of claims 1 to 9, wherein a hole or a curved portion having a predetermined shape is provided at both ends of the opening.   The disposable diaper according to any one of claims 1 to 10, wherein a reinforcing member having high rigidity is disposed at both ends of the opening.   The disposable diaper according to any one of claims 1 to 11, wherein a guide sign indicating the presence of the opening is provided in the vicinity of the opening.   The disposable diaper according to claim 12, wherein the guide sign suggests the presence of the opening by giving a color.   The disposable diaper according to claim 12, wherein the guide sign indicates the presence of the opening by unevenness.   The disposable diaper according to any one of claims 1 to 14, wherein an opening assisting tool is provided on a crotch part side of the opening.

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