JP5953649B2 - Tape type disposable diaper - Google Patents

Description

  The present invention relates to a tape-type disposable diaper. More specifically, the present invention relates to a tape-type disposable diaper having a three-dimensional gather excellent in leakage prevention.

  In general, a tape-type disposable diaper is constituted by each part of a front body 2, a crotch part 4 and a back body 6 like a tape-type disposable diaper 100 shown in FIG. And a fastening tape 150 for fixing the front body 2 and the back body 6 (see, for example, Patent Document 1). Here, FIG. 11 is a plan view showing a conventional tape-type disposable diaper, in which the tape-type disposable diaper is developed and viewed from the top sheet side.

  According to such a tape-type disposable diaper 100, the excrement of the wearer is absorbed by the absorbent body 122 through the liquid-permeable portion of the sheet 118 (for example, the top sheet) constituting the absorbent main body. In addition, leakage to the outside is prevented by a sheet 120 (for example, a back sheet) usually made of a liquid-impermeable material, and excrement can be held inside the diaper. Further, the front body 2 and the back body 6 of the diaper are fixed to each other by the fastening tape 150, so that the wearer can easily attach the diaper to the wearer.

  Such a tape-type disposable diaper 100 further includes a three-dimensional gather 126 (126a, 126b) configured to be able to stand up three-dimensionally in order to prevent side leakage of urine excreted by the wearer. is there. For example, a conventional three-dimensional gather is configured by arranging an elastic material on a part of a water-repellent sheet material (for example, as shown in FIG. 18, three-dimensional gather elastic material 136 (136a, 136b) is provided on a water-repellent sheet 132. And the like, and the like.

JP 2003-275244 A

  However, such a three-dimensional gather is weak in sheet material, and even if the three-dimensional gather is erected by an elastic material disposed at the tip of the three-dimensional gather, the leak-proof property of the three-dimensional gather is not sufficiently exhibited. There is a problem that urine leakage such as side leakage may not be sufficiently suppressed. In particular, in three-dimensional gathers of disposable diapers conventionally used for adults, when the amount of excreted urine increases, a large amount of urine cannot be blocked by the three-dimensional gathers, and urine leaks to the outside. It was getting easier.

  The present invention has been made to solve the above-described problems of the prior art, and provides a tape-type disposable diaper provided with a three-dimensional gather excellent in leakage prevention.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventor used a sheet material that is a leak-proof wall of a three-dimensional gather, in which at least two sheet materials are laminated, It is conceived that the above problems can be solved by joining the at least two sheet materials to each other by heat sealing in the direction extending along the side edge of the absorber on the tip end side of the three-dimensional gather. Completed the invention. Specifically, the following tape-type disposable diapers are provided by the present invention.

[1] The front body, the crotch part, and the back body, the absorbent body, the top sheet that is disposed so as to cover the surface of the absorbent body, and at least part of which is made of a liquid-permeable material, and the absorbent body An absorptive main body having a back sheet made of a liquid-impermeable material, and arranged to cover the back surface, and arranged to extend from the left and right side edges of the back body of the absorptive main body, A fastening tape for fixing the back and the back body, and at least a pair of three-dimensional gathers arranged along the side edges of the absorber on the surface of the top sheet, The portion from the root portion joined to the surface of the top sheet to the tip of the three-dimensional gather is formed by at least two sheet materials and stands on a part of the at least two sheet materials. The body gather elastic material is disposed, and the at least two sheet materials are joined at a joint portion formed by heat sealing provided on the tip side of the three-dimensional gather , and the heat The joint portion made of a seal is intermittently provided in a direction extending along a side edge of the absorber, and the three-dimensional structure is provided between the tip portion of the three-dimensional gather and the joint portion made of the heat seal. Tape-type disposable diaper with gathered elastic material.

[2] the shape of the welding surface of the joint portion consisting of the intermittently provided et the said heat-sealed, a parallelogram, and said welding surface of said parallelogram, at least one pair of The tape-type disposable diaper according to [1], wherein the opposite side is formed in a shape that intersects at an angle of 30 to 60 ° with a direction extending along a side edge of the absorbent body.

[3] The part from the base part to the tip part of the three-dimensional gather is constituted by the sheet material in which one sheet material is folded back toward the root part at the tip part of the three-dimensional gather. The tape-type disposable diaper according to any one of [1] or [2].

[4] the joint consisting of the heat sealing, at the tip portion from the base portion of the standing gathers, the front end portion of 40% of the provided we are in and the range [1] to [3] The tape-type disposable diaper according to any one of the above.

  In the tape-type disposable diaper of the present invention, each of at least a pair of three-dimensional gathers arranged along each side edge of the absorbent body has a leak-proof wall portion that forms from the root part to the tip part of the three-dimensional gather. It is formed of at least two sheet materials, and these at least two sheet materials are joined to each other by heat sealing in the direction extending along the side edge of the absorber on the tip end side of the three-dimensional gather. Therefore, the stiffness of the sheet material becomes strong and urine leakage such as side leakage can be favorably prevented by the three-dimensional gather. In particular, even a tape-type disposable diaper that is used for adults with a large amount of urine excreted, a large amount of urine can be blocked by the three-dimensional gather, and leakage of urine can be prevented well.

  In addition, as described above, since the at least two sheet materials are joined to each other by heat sealing, the standing state of the three-dimensional gathers is maintained extremely favorably without the two sheet materials separating and spreading. Will be. For example, if the two sheet materials are not joined to each other, the two sheet materials spread in a bag shape at the middle part of the rise of the three-dimensional gather. In such a case, the three-dimensional gather is easily bent. Moreover, the surface of an absorptive main body will be covered with the said sheet material, and absorption of urine etc. will be inhibited.

It is a top view showing one embodiment of a tape type disposable diaper of the present invention, and is a figure showing the state where a tape type disposable diaper was developed and it looked from the top sheet side. It is a schematic diagram which shows the A-A 'cross section of FIG. It is a perspective view which shows the state which uses the tape type disposable diaper of this invention. It is the enlarged view which expanded a part of solid gathers in one embodiment of the tape type disposable diaper of the present invention. It is a schematic diagram which shows typically an example of the welding surface of the heat seal given to the solid gathers shown in FIG. It is a schematic diagram which shows typically the cross section of other embodiment of the tape-type disposable diaper of this invention. It is a schematic diagram which shows typically the other example of the welding surface of the heat seal given to the solid gathers. It is a front view showing typically the heat seal machine used for manufacture of the tape type disposable diaper of the present invention. It is a side view of the heat sealing machine shown in FIG. It is a schematic diagram which shows the state which expanded the pattern roll of the heat sealing machine shown in FIG. It is a top view which shows the conventional tape-type disposable diaper, and is a figure which shows the state which expand | deployed the tape-type disposable diaper and was seen from the top sheet side.

  Hereinafter, the form for implementing the tape type disposable diaper of this invention is demonstrated concretely. However, the present invention broadly encompasses tape-type disposable diapers having the invention-specific matters, and is not limited to the following embodiments.

  In the present specification, the “tape-type disposable diaper” is composed of a front body 2, a crotch part 4, and a back body 6 as in the tape-type disposable diaper 1 shown in FIG. The sheet 18 and the back sheet 20) are laminated so that the absorbent body 22 is sandwiched between them, and the left and right side edges 6a and 6b of the rear body 6 of the absorbent body 14 are extended. "Fastening tape 50" for fixing the front body 2 and the back body 6, and "at least a pair of three-dimensional gathers disposed on the surface of the top sheet 18 along each side edge of the absorber 22. 26 (26a, 26b) "and the tape-type disposable diaper 1 is meant.

  As shown in FIG. 3, such a tape-type disposable diaper 1 has a waist opening 10 that covers the circumference of the wearer's waist by fixing the front body 2 and the back body 6 with a fastening tape 50. And a pair of leg opening part 12 which covers the wearer's leg periphery is formed.

  In the present specification, “front body”, “inseam” and “rear body” are defined as follows. For example, as shown in FIGS. 1 and 3, in the tape-type disposable diaper 1, when the diaper is worn, a portion where the pair of left and right leg openings 12 a and 12 b (see FIG. 3) is formed has a constricted shape. It is configured as follows. The first boundary line connecting the starting points of the side that is addressed to the first half of the constriction (front body 2 side) and the starting point of the side that is addressed to the second half of the constriction (the back body 6 side) The part between the two boundary lines is “the crotch part (reference numeral 4 in the figure)”, and the part from the first boundary line to the front end (waist edge 2c) of the tape-type disposable diaper 1 is “front body (FIG. The portion from the second boundary line to the rear end (waist end edge 6c) of the tape-type disposable diaper 1 is referred to as “rear body (reference numeral 6 in the figure)”.

  In addition, the “absorbent body” is a member having a function of absorbing and holding the urine excreted by the wearer in the tape-type disposable diaper, and includes the front body, the crotch part, and the back body as described above. And a plurality of sheets are laminated in a state of sandwiching the absorber. For example, as such an absorptive main body, as shown in FIG. 1, the absorbent body 22, the top sheet 18 disposed so as to cover the inner surface of the absorbent body 22, and the outer surface of the absorbent body 22 are covered. The back sheet 20 disposed on the back sheet 20 is a constituent element, and the absorbent body 22 is fixed and integrated in a state of being sandwiched between the top sheet 18 and the back sheet 20.

  The "fastening tape" is a member for fixing the front body and the back body of the diaper when the tape-type disposable diaper is worn. In the tape-type disposable diaper of the present invention, the front body It is comprised by the fastener part which fixes to a to-be-attached part, and the base material for arrange | positioning a fastener part. In addition, as a fastener part, the hook material of a mechanical fastener and the adhesive fastener which fixes by the adhesive force of an adhesive agent can be mentioned.

  The “hook material” described above is a convex member of a mechanical fastener (also referred to as a planar fastener) and can be fixed by mechanical coupling with a loop material that is a concave material. As the “hook material”, for example, a material having a large number of protrusions (such as a bowl shape, a mushroom shape, a bowl shape) formed on the surface thereof is used.

  In addition, the “base material” of the fastening tape means that a hook material or the like is attached near one end, and the other end is fixed to, for example, a side edge of the back body of a tape-type disposable diaper. Therefore, it functions as the main body of the fastening tape.

  The “three-dimensional gather” is a member for preventing side leakage of urine excreted by the wearer, and is a leak-proof wall configured to be able to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather becomes a breakwater, and leakage from a leg opening or the like of the diaper (so-called “lateral leakage”) can be effectively prevented. In general, at least one pair of the three-dimensional gathers is provided along each side edge of the absorber.

[1] Tape-type disposable diapers:
Drawing 1 is a top view showing one embodiment of a tape type disposable diaper of the present invention, and is a figure showing the state where a tape type disposable diaper was developed and it looked from the top sheet side. FIG. 2 is a schematic diagram showing a cross section taken along the line AA ′ of FIG. FIG. 3 is a perspective view showing a state in which the tape-type disposable diaper of the present invention is used.

  As shown in FIGS. 1 to 3, the tape-type disposable diaper 1 of the present invention includes an absorbent main body 14, a fastening tape 50, and a side sheet of the absorbent body 22 on the surface of the top sheet 18 of the absorbent main body 14. A tape-type disposable diaper 1 including at least a pair of three-dimensional gathers 26 arranged along the line. In the tape-type disposable diaper 1 of the present invention, the three-dimensional gather 26 is located from the root portion 28X joined to the surface of the top sheet 18 to the tip 28Y of the three-dimensional gather 26 (that is, the leakage prevention of the three-dimensional gather 26). A wall portion) is formed by at least two sheet materials 32 (32a, 32b), and the at least two sheet materials 32a, 32b are absorbent on the tip end portion 28Y side of the three-dimensional gather 26. They are joined to each other by a heat seal 29 in a direction P extending along the side edges of 22.

  By configuring in this way, the stiffness of the part that becomes the leak-proof wall of each of the three-dimensional gathers 26a and 26b (that is, the part constituted by the sheet material 32) becomes strong, and urine such as side leakage is produced by the three-dimensional gather 26a and 26b. Can be satisfactorily prevented. In particular, even in a tape-type disposable diaper that is used for adults with a large amount of urine excreted, a large amount of urine can be blocked by the three-dimensional gathers 26a and 26b, and leakage of urine can be satisfactorily prevented. .

  In particular, in the tape-type disposable diaper 1 of the present invention, at least two sheet materials 32 (in FIG. 1 and FIG. 2, two sheet materials 32a and 32b) are joined to each other by a heat seal 29. The standing state of the three-dimensional gather 26 is maintained extremely favorably without the two sheet materials 32a and 32b spreading apart. For example, if the two sheet materials 32a and 32b are not bonded to each other (that is, not bonded by the heat seal 29), the two sheets are formed at the middle portion of the rise of the three-dimensional gather 26, etc. The materials 32a and 32b spread in a bag shape. In such a case, the three-dimensional gather 26 is easily bent. Moreover, the surface of the absorptive main body 14 may be covered with the sheet material 32 (in other words, a part of the three-dimensional gather 26), and the absorption of urine or the like may be hindered.

  Further, although not particularly limited, in the tape-type disposable diaper 1 of the present invention, as shown in FIGS. 1 and 2, the heat seal 29 that joins at least two sheets 32a and 32b absorbs. It is preferable to apply intermittently in the direction P extending along the side edge of the body 22. With this configuration, the two sheet materials 32a and 32b can be satisfactorily bonded, and the tearing of the sheet materials 32a and 32b from the portion where the heat seal 29 is applied can be effectively prevented. The three-dimensional gather 26 that is less likely to be damaged or the like can be obtained. For example, when the heat seal 29 is continuously applied in the direction P extending along the side edge of the absorbent body 22, the sheet materials 32 a and 32 b may be easily broken along the heat seal 29.

  When the heat seal 29 is intermittently applied in the direction P extending along the side edge of the absorber 22, as shown in FIGS. 4 and 5, each welding surface 29 a of the heat seal 29 applied intermittently. The parallelogram welding surface 29a is orthogonal to the direction P in which at least one pair of opposite sides extends along the side edge of the absorber at an angle of 90 °. Preferably not. In particular, the parallelogram welding surface 29a is preferably formed in a shape in which the pair of opposite sides intersect at an angle of 30 to 60 °.

  For example, in the case where the heat seal 29 is intermittently performed, when the pair of opposite sides of each welding surface 29a is orthogonal to the direction P extending along the side edge of the absorber at an angle of 90 °, The apex of the welding surface 29a is likely to have a hole, and the sheet material 32 constituting the three-dimensional gather 26 may be easily broken from the apex of the parallelogram welding surface 29a. As shown in FIGS. 4 and 5, the pair of opposite sides of the parallelogram welding surface 29 a is configured to be inclined with respect to the direction in which the heat seal 29 is intermittently applied (that is, the direction P). Thus, for example, even when the sheet material 32 is pulled in the direction P and stress is applied, the stress applied to each vertex of the welding surface 29a is dispersed, and the sheet material 32 is unlikely to have a hole. And it becomes difficult to tear.

  Here, FIG. 4 is an enlarged view of a part of the three-dimensional gather in one embodiment of the tape-type disposable diaper of the present invention. FIG. 5 is a schematic diagram schematically showing an example of a welding surface of a heat seal applied to the three-dimensional gather shown in FIG.

  Hereinafter, each component of the tape type disposable diaper of this invention is demonstrated more concretely.

[1-1] Absorbent body:
The tape-type disposable diaper of the present invention includes an absorbent main body as a member having a function of absorbing and holding urine excreted by the wearer. The absorbent main body is formed by laminating a plurality of sheets with the absorbent body sandwiched between them. For example, as shown in FIGS. 1 and 2, the front body 2, the crotch 4, and the back body 6 Consists of an absorbent body 22, a top sheet 18 disposed so as to cover the inner surface of the absorbent body 22, and a back sheet 20 disposed so as to cover the outer surface of the absorbent body 22 as constituent elements. A member in which the absorber 22 is fixed in a state of being sandwiched between the top sheet 18 and the back sheet 20 and is integrated in a pad shape can be given.

[1-1a] Top sheet:
A top sheet is a sheet | seat arrange | positioned on the surface located in a wearer's skin side. For this reason, at least a part of the top sheet is constituted by a liquid-permeable sheet. By comprising in this way, urine can permeate | transmit a liquid-permeable sheet | seat, reaches | attains an absorber rapidly, and can be absorbed and hold | maintained. In addition, as long as at least one part is comprised with the liquid-permeable sheet, the whole top sheet does not necessarily need to be comprised with the liquid-permeable sheet. As long as the liquid-permeable sheet is a sheet having liquid permeability, the material of the sheet is not particularly limited, and examples thereof include a woven fabric, a nonwoven fabric, and a porous film.

  In addition, a liquid-permeable nonwoven fabric can be mentioned as a more suitable example of a top sheet. By using such a liquid-permeable nonwoven fabric, the touch is good and the smoothness of the surface after liquid absorption can be improved.

[1-1b] Backsheet:
A back seat | sheet is a sheet | seat arrange | positioned on the surface located in a wearer's clothing side. The back sheet is composed of a liquid-impermeable sheet that does not transmit urine so that urine absorbed by the absorbent body is not leaked to the outside of the absorbent main body. The liquid-impermeable sheet includes a liquid-low-permeability sheet that hardly permeates urine but can be permeated by applying pressure.

  As the liquid impervious sheet described above, a polyethylene film used for general absorbent products can be cited as a preferred example. Such polyethylene films include a moisture permeable polyethylene film and a non-moisture permeable polyethylene film, and any film can be used as a back sheet, but a moisture permeable polyethylene film can be more suitably used. By using such a moisture-permeable polyethylene film as a back sheet, stuffiness is reduced during wearing, and comfort when a diaper is worn can be improved.

  Moreover, as a liquid low-permeability sheet | seat mentioned above, a nonwoven fabric with a high water pressure resistance can be mentioned as a suitable example. As the nonwoven fabric with high water pressure resistance, for example, nonwoven fabrics such as SMS (spunbond / meltblown / spunbond) and SMMS (spunbond / meltblown / meltblown / spunbond) are preferable.

[1-1c] Absorber:
The absorber used for the general absorbent product can be used as the absorber. For example, as an absorbent material constituting the absorber, fluff pulp obtained by pulverizing wood pulp into a cotton shape and a highly water-absorbing resin (hereinafter sometimes referred to as “SAP”) can be cited as preferred examples.

  In addition, in order to wrap the said absorber as needed, you may have further the water absorbent paper and the nonwoven fabric which performed the hydrophilic treatment. That is, it may be an absorbent body in which an absorbent material containing fluff pulp and SAP is wrapped with the above water-absorbing paper or a non-woven fabric subjected to hydrophilic treatment. Such a configuration has an advantage that SAP can be prevented from leaking from the absorber and shape stability can be imparted to the absorber. For example, in FIG. 2, the absorber 22a has shown the example using the absorber 22 wrapped with the nonwoven fabric 22b.

  Although there is no restriction | limiting in particular about the shape of an absorber, The shape used in the conventional disposable diaper and other absorbent articles, for example, a rectangular shape, an hourglass type, a gourd type, a T shape etc. can be mentioned. The tape-type disposable diaper 1 shown in FIG. 1 is an example in which an hourglass-type absorber 22 is used as the absorber 22.

[1-2] Fastening tape:
The tape-type disposable diaper of the present invention includes a fastening tape having a tape-like fastener for fixing the back body and the front body. When wearing a tape-type disposable diaper, the entire diaper can be made into a pants-type by fastening this fastening tape to the front body (for example, a fastening region formed in the front body), It becomes possible to attach a diaper to a wearer. The fastening tape is disposed so as to extend at least one from each side edge of the back body of the absorbent main body.

  The tape-type disposable diaper 1 shown in FIG. 1 is provided with two fastening tapes 50 on the left and right side edges 6a and 6b of the back body 6, respectively. In the fastening tape 50, a fastener portion 44 made of a hook material of a mechanical fastener is formed in the vicinity of the tip of a cloth base material 48. The front body 2 of the absorbent main body 14 is formed with a fastening region 47 formed of a loop of a mechanical fastener so that the fastener portion 44 of the fastening tape 50 can be fixed. Preferably it is. By comprising in this way, the back body 6 of the tape-type disposable diaper 1 can be fixed to the front body 2, and the tape-type disposable diaper 1 can be attached to the wearer.

  The fastening tape is not limited to the form shown in FIG. 1 described above, and the construction of the fastening tape used in a conventionally known tape-type disposable diaper can be employed. For example, the fastener portion 44 may be formed of an adhesive layer coated with an adhesive other than the loop of the mechanical fastener. 1 shows an example in which two fastening tapes 50 are arranged on each of the left and right side edges 6a and 6b of the back body 6, but the left and right side edges 6a of the back body 6 are shown. , 6b may be provided with one fastening tape 50 each.

[1-3] Solid gathering:
The tape-type disposable diaper of the present invention includes at least a pair of three-dimensional gathers disposed along the side edges of the absorbent body on the surface of the top sheet for preventing side leakage of urine excreted by the wearer. Yes. By forming such a three-dimensional gather, the three-dimensional gather becomes a breakwater, and leakage from a leg opening or the like of the diaper (so-called “lateral leakage”) can be effectively prevented.

  In particular, in the tape-type disposable diaper of the present invention, the portion from the root portion joined to the surface of the top sheet of the three-dimensional gather to the tip end portion is formed of at least two sheet materials, and at least the two The sheet materials are joined to each other by heat sealing in the direction extending along the side edge of the absorber on the tip end side of the three-dimensional gather (in other words, at a certain distance from the tip portion of the three-dimensional gather). .

  For example, as for the three-dimensional gather used for the conventional tape type disposable diaper, only a part of the front-end | tip part may be comprised by the double sheet | seat in order to arrange | position a three-dimensional gather elastic material, The part that becomes a leak-proof wall from the base part of the gather to the tip part is usually constituted by one sheet. However, such a three-dimensional gather composed of one sheet is weak in the sheet material, and even if the three-dimensional gather is erected by an elastic material disposed at the tip of the three-dimensional gather, the three-dimensional gather is prevented. Leakage was not sufficiently developed, and urine leakage such as side leakage could not be sufficiently suppressed.

  In the tape-type disposable diaper of the present invention, by forming the part from the root part to the tip part of the three-dimensional gather with at least two sheet materials, the stiffness of the sheet material becomes strong, and the three-dimensional gather causes side leakage, etc. The leakage of urine can be prevented well. In addition, since at least two sheet materials are bonded to each other by heat sealing, the standing state of the three-dimensional gathers can be maintained extremely suitably without the two sheet materials separating and spreading. .

  As shown in FIGS. 1 and 2, the three-dimensional gather 26 used in the tape-type disposable diaper 1 of the present invention is part of at least two sheets 32a and 32b (preferably part on the tip 28Y side). ), A three-dimensional gather stretchable material 36 (36a, 36b) is arranged, and a gather (crease) is formed on the sheet material 32 by the three-dimensional gather stretchable material 36.

  As the sheet material 32 constituting the three-dimensional gather 26, a water-repellent sheet material can be suitably used.

  “The three-dimensional gather 26 is formed by two sheet materials 32 a and 32 b” means that a portion that becomes a leak-proof wall rising from the upright line 46 of the three-dimensional gather 26 is formed by laminating at least two sheet materials. Means that For example, like the three-dimensional gather 26 shown in FIGS. 1 and 2, the portion from the base portion 28 </ b> X to the tip portion 28 </ b> Y of the three-dimensional gather 26 is the same as the root portion 28 </ b> X at the tip portion 28 </ b> Y of the three-dimensional gather 26. May be formed by being folded back toward (that is, two sheets are obtained by folding one sheet), or the tape-type disposable diaper 1A shown in FIG. As described above, the two sheet materials 32a and 32b constituting the base portion 28X to the tip end portion 28Y of the three-dimensional gather 26 are overlapped so as to sandwich the three-dimensional gather expansion / contraction material 36 (36a, 36b). (That is, a laminate of two independent sheet materials). Here, FIG. 6 is a schematic view schematically showing a cross section of another embodiment of the tape-type disposable diaper of the present invention. In addition, in the tape-type disposable diaper 1A shown in FIG. 6, the same components as those of the tape-type disposable diaper 1 shown in FIG.

  2 and 5 show an example in which there are two sheet materials 32 forming each three-dimensional gather 26, but three-dimensional gathers may be formed by three or more sheet materials. . In such a case, it is preferable that all of the three or more sheet materials are joined by heat sealing.

  Further, as shown in FIG. 2, the sheet material forming the three-dimensional gather may be constituted by a completely different sheet from the absorbent main body. For example, although illustration is omitted, a three-dimensional gather is used. The sheet may be formed by folding back at least one of the sheets constituting the absorbent main body. Moreover, the sheet | seat which comprises the absorptive main body mentioned above can also be utilized for one sheet of at least 2 sheet material.

  In order to prevent leakage from the crotch part, the three-dimensional gathers may be formed at least on the crotch part of each side edge of the absorbent body, but may be formed on the front body or the back body. For example, the tape-type disposable diaper 1 shown in FIG. 1 has a pair of three-dimensional gathers 26 (26a, 26b) continuously from the crotch part 4 to both the front body 2 and the back body 6 along the longitudinal direction of the diaper. The example which is formed is shown. Note that at least one pair of solid gathers must be formed, but two or more pairs may be formed. When forming two or more pairs of three-dimensional gathers, at least one pair of three-dimensional gathers should just be comprised by the at least 2 sheet material.

  The three-dimensional gather may be an inward gather that tilts toward the inside of the diaper, or an outward gather that tilts toward the outside of the diaper. Moreover, it can also be set as the three-dimensional gathers (C fold gather, Z fold gather, etc.) which formed the bending part and the folding | turning part in a part of height direction.

  As the three-dimensional gather stretchable material arranged in the three-dimensional gather, a stretchable material used in a conventionally known three-dimensional gather can be suitably used. The number of the three-dimensional gather elastic materials can be appropriately selected according to the usage pattern of the tape-type disposable diaper. In addition, in the tape-type disposable diaper 1 shown in FIG.1 and FIG.2, the example at the time of arrange | positioning the three-dimensional gather stretchable material 36 to each three-dimensional gather 26 is shown.

  The heat seal for joining at least two sheet materials constituting the three-dimensional gather can prevent the two sheet materials from spreading in a bag shape at the middle portion of the three-dimensional gather. It is preferable that it is applied. In particular, as shown in FIGS. 1 and 2, the heat seal 29 for joining at least two sheet materials 32 a and 32 b is intermittently applied in the direction P extending along the side edge of the absorber 22. Is preferred.

  Although there is no restriction | limiting in particular about the space | interval (pitch) in which the heat seal 29 is given, For example, it is preferable that it is 8-15 mm, and it is still more preferable that it is 9-11 mm. With this configuration, when using the diaper, the two sheet materials 32a and 32b constituting the three-dimensional gather 26 are not separated from each other, and the breakage from the portion where the heat seal 29 is applied is effectively performed. Can be prevented. For example, when the interval at which heat sealing is performed increases, the sheet edge may be noticeably lifted depending on the location. In addition, even when the heat seal is removed at one place, the sheet material may stand out. On the other hand, when the interval at which heat sealing is performed is narrow, the sheet materials are in close contact with each other, it is difficult to form a gap between the sheet materials, and the waterproof effect of the sheet material (that is, the three-dimensional gather) may be diminished.

  Further, in order to prevent the two sheet materials from spreading apart from each other, the heat seal is disposed on the tip side from the root of the three-dimensional gather to the tip (that is, the height of the three-dimensional gather). It is preferably applied in a range of 40%, and more preferably applied in a range of 20 to 30% from the tip side. By comprising in this way, it becomes difficult for two sheet | seat materials to spread mutually, and it can be set as the solid gathers excellent in leak-proof property. In addition, if the heat seal is applied to the portion where the elastic material such as the rubber thread is disposed, the rubber thread may be cut. Moreover, if the heat seal is too far from the tip, the space is too wide and the effect of applying the heat seal is reduced.

  Moreover, the shape of each welding surface 29a of the heat seal 29 applied intermittently is a parallelogram, and the parallelogram welding surface 29a has at least one pair of opposite sides on the side edge of the absorber. Is preferably not orthogonal to the direction P extending along the direction at 90 °. More preferably, the parallelogram welding surface 29a is formed in a shape in which the pair of opposite sides intersect at an angle of 30 to 60 °. By comprising in this way, the tear from the welding surface 29a of the heat seal 29 can be prevented still more effectively. When intersecting at an angle of less than 30 ° or exceeding 60 °, particularly when intersecting at an angle of 90 °, a hole is easily formed at the apex of the welding surface 29a, and the sheet material is torn from this hole. May end up.

  In FIG. 5, although the example of the case where the shape of each welding surface 29a of the heat seal 29 is a rhombus (diamond type) is shown, the shape of each welding surface 29a is not limited to the above rhombus, The shape may be perpendicular to the direction P extending along the side edge of the absorber at an angle of 90 ° (for example, a parallelogram other than a rhombus). For example, as shown in FIG. 7, the shape of each welding surface 29a of the heat seal 29 may be a parallelogram in which the length of one set of opposite sides is different from the length of the other set of opposite sides. Here, FIG. 7 is a schematic view schematically showing another example of the welding surface of the heat seal applied to the three-dimensional gather.

  As shown in FIGS. 1, 2 and 4, the three-dimensional gather 26 of the tape-type disposable diaper 1 of the present invention includes a heat seal 29 (hereinafter referred to as “sheet material joining”) that joins the two sheet materials 32 a and 32 b described above. Separately from the heat seal for the three-dimensional gather 26, the heat seal 30 for joining the two sheet materials 32a and 32b (hereinafter referred to as "the root heat seal 30"). There is). The root heat seal 30 is preferably applied continuously in the direction P extending along the side edge of the absorber 22. In addition, the root part of this three-dimensional gather 26 and the absorptive main body 14 can be joined by a hot melt adhesive or the like separately from the root part heat seal 30. Further, when the two sheet materials are separate and independent sheet materials, it is preferable that the sheet materials are bonded to each other even at the front end side of the three-dimensional gather.

  When the heat seal 29 (heat seal for sheet material joining) for joining the two sheet materials 32a and 32b and the root heat seal 30 are applied to the three-dimensional gather 26, for example, FIG. A heat sealing machine 80 as shown in FIG. 10 can be used.

  Here, FIG. 8 is a front view schematically showing a heat sealing machine used for manufacturing the tape-type disposable diaper of the present invention. FIG. 9 is a side view of the heat sealing machine shown in FIG. FIG. 10 is a schematic diagram showing an enlarged state of the pattern roll of the heat sealing machine shown in FIG.

  The heat sealing machine 80 shown in FIGS. 8 to 10 is a pair of sheets that can simultaneously perform heat sealing for sheet material bonding and root heat sealing on a pair of three-dimensional gathers arranged on the side edges of the absorber. A pattern roll 81 is provided. Each pattern roll 81 has a first heat seal portion 82a that performs heat sealing continuously in one direction to perform root heat sealing, and intermittent heat sealing in one direction for sheet material bonding. And a second heat seal portion 82b for heat sealing. By using such a heat sealing machine 80, joining of two sheet materials constituting a three-dimensional gather (that is, heat sealing) can be performed at the root portion and the intermediate portion at the same time, and the present invention is very simple. The tape-type disposable diaper can be manufactured. Note that reference numeral 83 in FIG. 7 indicates a rotation shaft that connects the pair of pattern rolls 81 and rotates the pattern roll 81.

[1-4] Various elastic materials:
The tape-type disposable diaper of the present invention may be one in which a leg-around elastic material and a waist-around elastic material are further arranged.

  The leg-around elastic material is an elastic material arranged along the leg opening. By arranging this leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the leg opening can be effectively prevented. Further, when the leg stretchable material is disposed, the leg stretchable material contracts on both sides of the absorbent body when changing the diaper, so that the vicinity of the crotch portion is deformed into a bowl shape and a recess is formed. For this reason, urine etc. accumulate in the crevice and can change a diaper easily, without spilling urine.

  The tape-type disposable diaper 1 shown in FIG. 1 is an example in which leg gathers are formed by arranging four leg-stretchable elastic members 40 linearly along the longitudinal direction of the absorbent main body 14. The leg-around elastic member 40 is made of rubber thread. In addition, it is not necessary to arrange | position the leg periphery elastic material linearly, For example, you may arrange | position along a curve of the leg opening part of a diaper in a curve.

  It is preferable that the leg-surrounding stretchable material is disposed at a portion outside the upright line 46 of the three-dimensional gather 26, for example, like the tape-type disposable diaper 1 shown in FIG. By comprising in this way, the mounting | wearing feeling of a crotch part can be improved, ensuring the sufficient leak-proof effect of a three-dimensional gather.

  The tape-type disposable diaper 1 shown in FIG. 1 shows an example in which the shape, arrangement position, number of arrangements, etc. of the leg elastic members 40 are symmetrical, but the left and right leg elastic members 40 are arranged so as to be asymmetric. May be. And in the tape-type disposable diaper 1 shown in FIG. 1, although the example which has arrange | positioned four leg periphery elastic materials 40 per one side is shown, there is no restriction | limiting in particular about the number of the leg periphery elastic materials 40. FIG. In addition, when a plurality of leg elastic members are used, their thickness, stretch rate, etc. can be appropriately set according to the purpose.

  Next, the waist circumference elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist, and urine leakage from around the waist can be prevented. Moreover, the fitting property of the diaper to a wearer becomes favorable and can prevent the diaper slipping down.

  The tape-type disposable diaper 1 shown in FIG. 1 is an example in which a band-shaped waist-circular stretchable material 42 is disposed along the edge of the body 6 after that. This belt-like waist elastic member 42 can be made of urethane foam or the like. In addition, in FIG. 1, although the example at the time of arrange | positioning the waist surrounding elastic material 42 in the back body 6 (back side) is shown, both the back body 6 (back side) and the front body 2 (abdominal side) are shown. You may arrange in.

  For these stretchable materials, it is possible to determine the constituent material, the stretch rate of the material, the stretched state at the time of fixation, etc. in consideration of the degree of gather contraction and the like.

  As said elastic material, the elastic material currently used for absorbent articles, such as the conventional disposable diaper, can be used. Specific examples include thread rubber made of an elastic material such as natural rubber and synthetic rubber (urethane rubber, etc.), flat rubber, stretchable net, stretchable film, stretchable foam (urethane foam, etc.), and the like.

  The stretchable material is preferably fixed in a stretched state in order to exert a sufficient stretch force. For example, when the elastic material is natural rubber or synthetic rubber, it is preferably fixed in an extended state of 120 to 400%, and more preferably fixed in an extended state of 200 to 300%. By fixing in the extended state in such a range, it is possible to apply a sufficient stretching force.

  The stretchable material can be fixed by an adhesive and other means. Examples of the fixing method include an adhesive method using a hot melt adhesive and other highly fluid adhesives, a heat sealing method including heat sealing, and a method using welding using ultrasonic waves.

[2] Manufacturing method of tape-type disposable diaper:
Hereinafter, the manufacturing method of the tape type disposable diaper of this invention is demonstrated in the example in the case of manufacturing the tape type disposable diaper 1 shown in FIG. First, a continuous body of an absorbent main body in which the absorbent body 22 is sandwiched at a predetermined interval by a plurality of long sheets (for example, long sheets for forming the back sheet 20 and the top sheet 18) is formed. To do.

  Next, at least two sheet materials for forming a three-dimensional gather are arranged along each side edge of the absorbent body of the absorbent main body. As described above, the two sheet materials are formed by bending one sheet material at the tip of the three-dimensional gather, and the portion serving as the leakage prevention wall of the three-dimensional gather is substantially two sheets. It may be formed by. Moreover, it is preferable to arrange | position an elastic material (three-dimensional gather elastic material) in the position used as the front-end | tip part side of a three-dimensional gather between these at least 2 sheet materials. Two sheet | seat materials can be fixed to the surface of an absorber main body with an adhesive agent and another means, for example. Examples of the fixing method include an adhesive method using a hot melt adhesive and other highly fluid adhesives.

  Next, using a heat sealing machine 80 as shown in FIGS. 8 to 10, a portion corresponding to the “base portion of the three-dimensional gather” of the two sheet materials is joined to the absorbent main body by heat sealing, Two sheet materials are joined together by heat sealing. In addition, a solid gather and an absorptive main body can also be joined by the heat seal in the "base part of a solid gather".

  Next, the fastening tape in which the fastener portion is disposed on the base material is attached to the side edge of the rear body of the absorbent main body by, for example, hot melt. Then, the tape-type disposable diaper of this invention can be manufactured by cut | disconnecting the continuous body of an absorptive main body to predetermined length. The order of joining the three-dimensional gathers and attaching the fastening tape may be reversed. In addition, the method for manufacturing a tape-type disposable diaper of the present invention is not limited to the above-described method, and at least two sheets are formed from the base part to the tip part of the three-dimensional gather by using at least two sheets. As long as the sheet material can be bonded by heat sealing, a method other than the method described above may be used.

  The tape-type disposable diaper of the present invention can be suitably used as a diaper for infants or for adults such as elderly people and persons with disabilities who need care.

1, 1A, 1B: Tape-type disposable diaper, 2: Front body, 2a, 2b: Side edge (side edge of front body), 2c: Waist edge, 4: Crotch, 6: Rear body, 6a, 6b: Side edge (side edge of back body), 6c: waist edge, 10: waist opening, 12, 12a, 12b: leg opening, 18: top sheet, 20: back sheet, 22: absorber, 22a: absorption Material, 22b: non-woven fabric, 26, 26a, 26b: solid gather, 28X: root portion (root portion of solid gather), 28Y: tip portion (tip portion of solid gather), 29: heat seal, 32, 32a, 32b: Sheet material 36, 36a, 36b: Three-dimensional gather elastic material, 40: Elastic material around leg, 42: Elastic material around waist, 44: Fastener part, 46: Standing line, 47: Fastening region, 48: Base material 50: Fastening tape, 0: heat sealing machine, 81: pattern roll, 82a: first heat sealing part, 82b: second heat sealing part, 83: rotating shaft, 100: tape-type disposable diaper, 114: absorbent main body, 118, 120 : Sheet, 122: Absorber, 126, 126a, 126b: Solid gather, 132: Sheet (water-repellent sheet), 136, 136a, 136b: Solid gather elastic material, 150: Fastening tape, P: Absorber side The direction that extends along the edge.

Claims (4)

Consists of a front body, a crotch part, and a back body, arranged to cover the surface of the absorber, the absorber, and at least a part of the top sheet made of a liquid-permeable material, and covers the back surface of the absorber An absorbent body having a backsheet made of a liquid-impermeable material,
A fastening tape arranged to extend from the left and right side edges of the back body of the absorbent main body, and a fastening tape for fixing the front body and the back body;
Including at least a pair of three-dimensional gathers arranged along the side edges of the absorber on the surface of the top sheet,
In the three-dimensional gather, a portion from a base portion joined to the surface of the top sheet to a tip portion of the three-dimensional gather is formed by at least two sheet materials, and one of the at least two sheet materials. Three-dimensional gather elastic material is placed in the part,
The at least two sheet materials are joined at a joint portion made of heat seal provided on the tip end side of the three-dimensional gather , and the joint portion made of the heat seal is made of the absorber. A tape-type disposable diaper that is provided intermittently in a direction extending along a side edge, and in which the three-dimensional gather elastic material is disposed between the tip portion of the three-dimensional gather and the joint portion formed of the heat seal . The shape of the welding surface of the joint portion consisting of the intermittently provided et the said heat seal is a parallelogram, and the welding surface of the parallelogram, is at least one pair of opposite sides, The tape-type disposable diaper of Claim 1 currently formed in the shape which cross | intersects at an angle of 30-60 degrees with respect to the direction extended along the side edge of the said absorber. The portion from the root portion to the tip portion of the three-dimensional gather is constituted by the sheet material in which one sheet material is folded back toward the root portion at the tip portion of the three-dimensional gather. The tape-type disposable diaper according to either 1 or 2. Wherein the joint made of heat-seal, according to the in the root portion the tip, claim 1 is provided et the 40% of the range of the front end portion of the standing gather Tape-type disposable diaper.

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