JP2009000161A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper which has fitting property to cope with wearers in variable body shapes and is easily put on and taken off to/from the wearer. <P>SOLUTION: The disposable diaper 1 comprises an absorbent 22, a top sheet 18 at least partially comprising a liquid permeable material and a back sheet 20 comprising a liquid impermeable material, one opening 10 around the waist and a pair of openings 12a and 12b around legs are formed, and a flexible material 44 around the abdomen arranged at a part between the opening 10 around the waist and the openings 12a and 12b around the legs is provided further. For the flexible material 44 around the abdomen, a long-length flexible material composed of rubber whose tensile stress in 300% expansion in the outward trip of the second round trip is ≤40gf when executing repetitive expansion and contraction between 100% and 500% of an expansion rate is continuously arranged at the expansion rate 350 to 500% in an area not overlapping with the arranging area of the absorbent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a disposable diaper in which an abdominal circumference elastic material is not arranged in an area overlapping with an arrangement area of an absorber.

  As the disposable diaper, for example, as in the disposable diaper 100 shown in FIG. 3, the disposable diaper is composed of the front body 2, the crotch 4, and the back body 6, and the corresponding side edge portions of the front body 2 and the back body 6 are arranged. A pants-type disposable diaper is known in which a single waist opening 10 and a pair of leg openings 12 (12a, 12b) are joined.

  In such a pants-type disposable diaper, as shown in FIG. 3, a portion along the waist opening 10 and the leg opening 12 and further between the waist opening 10 and the leg opening 12. In general, a configuration in which elastic materials such as rubber thread (waist elastic material 42, leg elastic material 40, belly elastic material 44) are arranged (see, for example, Patent Document 1).

  For example, as shown in FIG. 4, the disposable diaper as described above includes a long sheet material 49 (49a, 49b) made of nonwoven fabric or the like, a long waist elastic material 42, a leg elastic material 40, an abdomen. After continuously attaching the surrounding elastic material 44, fixing the absorbent main body 14 provided with the absorber 22, forming the hole 24 that later becomes the opening around the leg, and folding the sheet material 49 in two It is continuously manufactured by a method of obtaining a plurality of pants-type disposable diapers by forming the joint portion 8 by means such as heat sealing and separating the joint portion 8 at the portion.

  When the manufacturing method as described above is adopted, elastic materials such as waist elastic material, leg elastic material, and belly elastic material are continuously attached in the circumferential direction of the diaper. The force acts from the whole diaper circumferential direction.

  However, there are some diapers where it is not desired to apply the stretching force of the stretchable material. For example, the portion where the absorbent body is disposed is not preferable when the absorbent body contracts due to the expansion and contraction force, because the fit of the diaper and the wearing feeling are hindered.

  Therefore, a disposable diaper has been proposed in which a stretchable material is attached only to a part of the diaper in the circumferential direction, and a portion where stretchable force does not act is formed. For example, in the disposable diaper 110 shown in FIG. 5, the belly stretchable material 44 is not attached to the portion where the absorbent body 22 is disposed, so that the stretch force of the belly stretchable material 44 does not act on that portion. A disposable diaper constructed.

  As the disposable diaper as described above, for example, an absorbent article in which a stretchable tape obtained by joining a stretchable material to a sheet-like support is intermittently disposed and a portion where a stretchable force does not act has been proposed ( For example, see Patent Document 2).

Registered Utility Model No. 3024357 Japanese Patent No. 3156251

  The disposable diaper is used for wearers of various body types, and it is desirable that good fit is exhibited for wearers of any body type.

  However, the absorbent article described in Patent Document 2 still leaves room for improvement in terms of such fit. For example, if it is a thick body wearer, there is a problem that the body is tightened too much, and conversely, if it is a thin body wearer, it tends to slip off from the body, and fit that can accommodate wearers of various body types It could not be said that it was equipped with. In addition, it was not sufficient in terms of ease of putting on and taking off diapers.

  Thus, at present, a disposable diaper that has a fit that can be applied to wearers of various body shapes and that is easy to be worn and removed from the wearer has not yet been disclosed.

  The present invention provides a disposable diaper having a fit that can be applied to wearers of various body types, and is easy to be worn and removed from the wearer.

  As a result of diligent studies to solve the problems of the prior art as described above, the inventor used rubber having predetermined characteristics as an abdominal stretchable material for forming a tammy gather, and the rubber was used as an absorber. The present invention has been completed by conceiving that the above-mentioned problems can be solved by continuously disposing in a region that does not overlap with the disposing region at a high expansion rate. Specifically, the following disposable diapers are provided by the present invention.

[1] An absorber, disposed so as to cover the surface of the absorber, at least a part of which is made of a liquid-permeable material, and disposed so as to cover the back surface of the absorber. And a back sheet made of a functional material, and composed of each part of the front body, the crotch part, and the back body, and corresponding side edges of the front body and the back body are joined to each other, and one waist opening And a pair of leg-hole openings, and an abdominal circumference elastic member disposed in a portion between the waist-around opening part and the leg-hole opening part. When stretched repeatedly between% and 500%, a long stretched material made of rubber having a tensile stress of 300 gf or less in the second reciprocating path does not overlap the area where the absorber is disposed In Disposable diapers at a rate from 350 to 500% is obtained consecutively arranged.

[2] When the stretchable material around the abdomen is repeatedly stretched between 100% and 500% in stretch rate, the tensile stress when stretched 300% in the second round trip is 300% stretched in the second round trip The disposable diaper according to the above [1], which is made of rubber showing a value of 75% or more of the tensile stress.

[3] A waist-periphery elastic material that is continuously disposed in an expanded state along the waist-periphery opening is further provided, and the waist-periphery elastic material is disposed more than the stretch rate at which the abdominal-periphery elastic material is disposed. The disposable diaper according to [1] or [2], wherein the stretch rate is low.

  The disposable diaper of this invention is equipped with the fit which can respond | correspond to the wearer of various body types, and it is easy to make it easy for a wearer, and to take off.

  Hereinafter, the best mode for carrying out the disposable diaper of the present invention will be specifically described with reference to a two-piece type pants-type disposable diaper. However, the present invention broadly encompasses disposable diapers having the invention specific items, and is not limited to the following embodiments.

  In addition, when calling it "pants-type diaper" in this specification, a) By joining the corresponding side edge parts of the front body 2 and the back body 6 like the disposable diaper 1 shown in FIG.1 and FIG.2. , A joint 8, one waist opening 10 and a pair of leg openings 12 a, 12 b are formed, and in addition to a diaper configured in a pant shape in advance, b) corresponding side edges of the front body and the back body Detachable fastener members are attached to each other, and a diaper which can be formed into a pants shape by fixing the fastener members to each other; c) Fastener members in which the corresponding side edges of the front body and the back body can be attached to and detached from each other. Diapers that are joined together and configured in a pants shape in advance. As a fastener member, the mechanical fastener etc. which combined the hook material and the loop material can be mentioned, for example.

  And the “two-piece type” means an absorbent main body 14 that functions to absorb and retain the excrement of the wearer (absorption / holding function) and a function (wearing function) that encapsulates the wearer's body. It shall consist of the exterior member 16 to bear, and shall mean the diaper of the type by which the absorptive main body 14 was arrange | positioned inside the exterior member 16. FIG. The absorptive main body 14 is a member provided with an absorber 22, a top sheet 18, and a back sheet 20 as components.

  In addition, in this specification, “front body” means a part that covers the abdomen (front of the body) of the wearer when a diaper is worn on the wearer, and “inseam” means that the wearer wears a diaper. When the wearer wears a diaper, the part covering the inseam of the wearer means the part covering the back side (back of the body) of the wearer.

[1] Disposable diapers:
The disposable diaper of this invention is arrange | positioned so that the surface of the absorber 22 and the absorber 22 may be coat | covered like the disposable diaper 1 shown in FIG.1 and FIG.2, for example, and at least one part is from liquid permeable material. The top sheet 18 and the back sheet 20 made of a liquid-impermeable material are disposed so as to cover the back surface of the absorbent body 22, and each part includes a front body 2, a crotch 4, and a back body 6. The corresponding side edges of the front body 2 and the back body 6 are joined together to form one waist opening 10 and a pair of leg openings 12 (12a, 12b). An abdominal circumference stretchable material 44 is further provided between the leg circumference openings 12 (12a, 12b), and the abdominal circumference stretchable material 44 repeatedly stretched between 100% and 500% in stretch rate. 2 times A long elastic material made of rubber having a tensile stress of 40 gf or less at the time of 300% extension in the forward path is continuously arranged at an extension ratio of 350 to 500% in an area that does not overlap with the arrangement area of the absorber 22. Is.

[1-1] Various elastic materials:
In the disposable diaper of the present invention, at least a belly stretchable material is disposed. An abdominal circumference elastic material is an elastic material arrange | positioned in the part (namely, part equivalent to a wearer's abdominal circumference) between a waist circumference opening part and a leg circumference opening part. By arranging the elastic material around the abdomen, it is possible to form a gather (tammy gather) rich in elasticity around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  In the disposable diaper of the present invention, the elastic material around the abdomen is made of rubber having a tensile stress of 300 gf or less at the time of 300% extension in the two-way forward path when repeatedly expanding and contracting between 100% and 500%. The long stretchable material is continuously disposed at an elongation rate of 350 to 500% in a region that does not overlap with the region where the absorber is disposed.

  When a rubber having a tensile stress of 40 gf or less at the time of 300% extension in the second round-trip path is used when repeatedly expanding and contracting between 100% and 500%, even if the rubber is arranged at a high extension ratio, the rubber Still has enough growth. Therefore, even if the wearer has a thick body shape, the body is not overtightened. Moreover, since such rubber | gum is flexible and rich in a stretching property, there also exists an advantage that it is easy to leave a diaper with respect to a wearer, and is easy to take it off. Examples of rubber having such characteristics include “Silver Queen” (trade name) manufactured by Asahi Tech.

  On the other hand, the long stretch material preferably has a tensile stress of 10 gf or more when stretched by 300%. By setting it to 10 gf or more, good fit can be exhibited even for a thin-body wearer, and slippage of the diaper can be effectively prevented. In order to obtain these effects more reliably, it is more preferable to use a rubber having a tensile stress of 12 to 35 gf at 300% elongation.

  Here, “tensile stress at 300% elongation” means a second reciprocation when the long elastic material is repeatedly expanded / contracted between 100% -500% elongation using a Tensilon tensile tester. It shall mean the tensile stress measured at 300% elongation in the forward path. Based on the tensile stress at the time of 300% elongation, an average elongation rate in the use state is assumed. Also, the tensile stress at the second round-trip is measured because the long stretchable material is placed in the stretched state when the diaper is manufactured. This is because the “second expansion” is considered to be performed.

  In the disposable diaper of the present invention, when the elastic material around the abdomen is repeatedly stretched between 100% and 500%, the tensile stress at the time of 300% stretching in the second round trip is the second round trip. It is preferably made of rubber showing a value of 75% or more of the tensile stress at 300% elongation. In other words, it is preferably made of rubber that is difficult to reduce the tensile stress even if it is repeatedly expanded and contracted.

  Generally, when rubber is repeatedly expanded and contracted, the rubber is fully extended and cannot be completely restored to its original state. On the other hand, the rubber has a characteristic that a high tensile stress is maintained even in the second reciprocating expansion and contraction. By using rubber having such characteristics, the rubber does not stretch even when worn, and an appropriate tightening force can be exhibited.

  In addition, the tensile stress at the time of repeated expansion / contraction can be measured by the same measurement method as the “tensile stress at 300% elongation” already described.

  The rubber constituting the long stretchable material is natural as long as it is a rubber having a tensile stress of 300 g or less in the two-way round trip when the stretch is repeatedly stretched between 100% and 500%, and the tensile stress is 40 gf or less. Any rubber material such as rubber and synthetic rubber can be used. For example, a rubber containing a natural rubber rich in flexibility and stretchability as a constituent component, or a synthetic rubber having the same flexibility and stretchability can be used. Stretch materials containing these rubbers are preferable in that it is possible to provide a disposable diaper having conflicting characteristics such as fit and softness.

  There is no restriction | limiting in particular also about the form of a elongate elastic material, Forms, such as a thread rubber and a flat rubber, can be employ | adopted. Conventionally, thread rubber has been used as an abdominal stretchable material, but since thread rubber is a twisted yarn in which a thin thread is twisted, adopting a method of cutting after placing an elastic material as described later, all In some cases, the yarn cannot be cut completely, and depending on the conditions, there is a possibility that the stretchable material may remain uncut. Therefore, it is preferable to use flat rubber for the disposable diaper of the present invention. Flat rubber is composed of a structure in which a single rubber is integrated, and thin threads are not twisted together like thread rubber. Therefore, it does not occur that all the yarns cannot be cut as in the case of rubber thread, and uncut portions are not generated. In particular, when the elastic material is cut in a state where the elastic material is arranged at a high elongation rate as described later, if the cut enters a part of the elastic material, the cut is extended by the elongation stress of the rubber, Since the elastic material is torn, there is an advantage that the elastic material can be cut easily and reliably.

  When flat rubber is used as the long stretchable material, the rubber width is preferably 0.2 to 1.3 mm, and the fineness is preferably 1400 to 5000 dtex.

  The elastic material around the abdomen in the disposable diaper of the present invention is fixed by an adhesive applied to at least a region where the long elastic material is continuously arranged at an elongation rate of 350 to 500% and does not overlap with the region where the absorber is disposed. Then, it is preferably cut in a region overlapping with the region where the absorber is disposed.

  Thus, by cutting the abdominal circumference stretchable material in the region overlapping with the region where the absorber is disposed, it is possible to prevent a problem that the stretching force acts on the absorber and the absorber contracts. Therefore, it is excellent in the fitting property and wearing feeling of a diaper, and compared with the absorbent article of patent document 2, manufacture is also easy. That is, when manufacturing, there is no need to create a stretchable tape in which a stretchable material is joined to a sheet-like support, and it is not necessary to dispose this stretchable tape intermittently on a nonwoven fabric sheet. Can be produced with high productivity. In order to further improve the fit and wearing feeling of the diaper, it is more preferable that not only the belly stretchable material but also the leg stretchable material is cut in a region that overlaps the region where the absorbent body is disposed.

  In addition, it is preferable to cut | disconnect only a part of each elastic material in the part equivalent to the arrangement | positioning site | part of the said elastic material for the said elastic material in the cutting | disconnection of an abdominal circumference elastic material. That is, it is preferable to cut only a part of one belly stretchable material. By doing so, a large number of cut pieces of the elastic material are not formed, and it becomes possible to prevent the appearance of the product from being defective due to the cutting of the elastic material.

  In the present specification, “cutting only a part” includes not only cutting only one part of the elastic material but also cutting a plurality of parts in the nearest region. For example, when an elastic material cutting roll described later is used, a plurality of portions of one elastic material may be cut by a plurality of adjacent cutting protrusions of the first roll. However, when the elastic material is cut at a plurality of locations in such an extremely limited region, a large number of cut pieces of the elastic material remain, and the appearance of the product is not deteriorated.

  Also, when placing a long stretchable material, placing and fixing it at a high stretch rate of 350% or more makes it difficult to slip off the body even when the wearer is a narrow body, and good fit Can be obtained.

  On the other hand, the expansion ratio is set to 500% or less. By setting it to 500% or less, the stretchable material can be easily stretched, and the diaper can be easily applied. Further, it is possible to avoid an excessive tightening force from acting on the wearer, and to effectively prevent a problem that a feeling of tightness is given at the time of wearing or a rubber mark is attached to the skin. In order to obtain these effects more reliably, it is more preferable to continuously arrange the long stretchable material at an elongation rate of 380 to 470%. The “stretch rate” indicates the ratio (percentage) of the length in the stretched state to the length of the long stretchable material in the non-stretched state. That is, the stretch rate of the long stretchable material in the non-stretched state is 100%, and the stretch rate when the stretchable material is stretched twice is 200%.

  For example, the disposable diaper 1 shown in FIGS. 1 and 2 is configured such that the leg-around elastic material 40 and the belly-around elastic material 44 are placed in the region where the absorber 22 is disposed by the elastic material cutting roll 50 shown in FIGS. It is an example of the disposable diaper cut | disconnected in the area | region which overlaps. In this example, cutting marks 64a, 64b, 64c, 64d, and 64e corresponding to the cutting protrusions 52a, 52b, 52c, 52d, and 52e in the first roll 54 are formed. In addition, the code | symbol 74 of FIG. 6 is a sending roll for sending out the sheet | seat material 49. FIG.

  For example, the belly stretchable materials are arranged at intervals so that a plurality of stretchable materials are substantially parallel. Although there is no restriction | limiting in particular about this arrangement | positioning space | interval, It is preferable that the some elastic material is arrange | positioned by 3-10 mm space | interval.

  In the disposable diaper of the present invention, it is preferable that a leg-surrounding stretchable material and a waistline stretchable material are disposed in addition to the belly stretchable material.

  The leg circumference elastic material is an elastic material arranged along the leg circumference opening. By arranging the leg-stretchable material, a gather (leg gather) rich in stretchability can be formed in the leg-surrounding opening. Therefore, it is difficult to form a gap around the leg, and urine leakage from the opening around the leg can be effectively prevented.

  The waist 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, preventing urine leakage from around the waist, and improving the fit of the diaper to the wearer, thereby preventing the diaper from falling down.

  As described above, in the case where the elastic material around the waist is arranged continuously in the stretched state along the opening around the waist, the waist circumference is larger than the stretch rate at which the belly elastic material is arranged. It is preferable to configure the stretch ratio at which the stretchable material is disposed low. Usually, in order to prevent leakage of excrement from around the waist, the stretch rate of the waist stretchable material is generally higher than that of the waist stretchable material. However, in the present invention, considering the reduction of the stretching force by the highly rigid absorber, the stretch rate of the waist stretchable material is configured to be lower than that of the waist stretchable material. This is because the absorber is not disposed in the vicinity of the opening around the waist. As a result, even when the wearer is a thick body type, in addition to being able to effectively prevent the waist circumference from being excessively tightened, the effect of the present invention that the diaper is easy to put on and can be easily taken off is sufficiently exhibited. It becomes possible to make it.

  The disposable diaper of the present invention is not particularly limited with respect to portions other than the stretchable material, and can be manufactured according to conventionally known disposable diapers.

[1-2] Absorber:
The absorber is a member for absorbing and holding the wearer's urine. The absorber is made of an absorbent material because it needs to absorb and retain the wearer's urine and body fluid.

  Examples of the absorbent material constituting the absorber include conventionally known absorbent materials usually used for disposable diapers and other absorbent articles, such as fluff pulp, super absorbent polymer (Super Absorbent Polymer; hereinafter referred to as “SAP”). And a hydrophilic sheet. It is possible to use wood pulp or non-wood pulp defibrated as fluff pulp, sodium polyacrylate as SAP, tissue, absorbent paper, hydrophilized nonwoven fabric as hydrophilic sheet preferable.

  It is preferable that the absorber is interposed at least in part between the top sheet and the back sheet. Usually, the absorber is interposed between the top sheet and the back sheet by being sandwiched between the top sheet and the back sheet and sealing the peripheral edge thereof. Therefore, the flap part in which the absorber is not interposed is formed between the top sheet and the back sheet at the peripheral part of the absorber.

  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.

[1-3] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the upper surface (surface located in a wearer's skin side at the time of mounting | wearing of a diaper) may be coat | covered. At least a part (all or a part) of the top sheet is made of a liquid-permeable material because the absorber disposed on the lower surface side needs to absorb the wearer's urine.

  Examples of the liquid permeable material constituting the top sheet include a woven fabric, a nonwoven fabric, and a porous film. Among these, it is preferable to use a non-woven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon and subjected to a hydrophilic treatment. The top sheet may be composed of a single sheet material, but may be composed of a plurality of sheet materials.

[1-4] Backsheet:
A back seat | sheet is a sheet | seat arrange | positioned so that the lower surface (surface located in a wearer's clothing side at the time of mounting | wearing of a diaper) may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the diaper.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

  Note that a sheet material (cover sheet) may be bonded to the outer surface of the back sheet. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

[1-5] Absorbent body:
In the two-piece type pants-type diaper, the top sheet, the back sheet, and the absorbent body are configured as one member called an “absorbent body” that is responsible for absorption and holding functions, and an exterior member that is manufactured separately. A pants-type diaper is formed by joining. This absorbent main body has a structure in which a top sheet is disposed on the upper surface side of the absorbent body and a back sheet is disposed on the lower surface side, and the absorbent body is interposed between the top sheet and the back sheet.

  An absorptive main body is comprised by the size which covers at least the crotch part of a diaper. However, in order to ensure the effect of preventing leakage, it is preferable to have a size that covers not only the crotch part but also a part of the front body and the back body. The absorptive main body can be fixed to the exterior member using, for example, a hot melt adhesive.

[1-6] Exterior member:
The exterior member is a member having a mounting function for encapsulating the wearer's body, and specifically, is a sheet-like member that forms the front body, the crotch portion, and the back body.

  In the two-piece type pants-type diaper, the absorbent main body serves exclusively for the absorption / holding function of absorbing and holding the excrement of the wearer, so a liquid-impermeable material as a material constituting the exterior member There is no need to use. Examples of the material constituting the exterior member include a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, and other thermoplastic resins.

  And in order to fix an exterior member in the state which pinched | interposed the elastic material etc. around the leg, in many cases, it is comprised by bonding together 2 or more sheet | seat materials (it is comprised with a nonwoven fabric etc.). For example, in the disposable diaper 1 shown in FIGS. 1 and 2, the exterior member 16 is configured by bonding two sheet materials, and the leg elastic member 40, the waist elastic member 42, and the belly layer between the sheet materials. This is an example in which a surrounding elastic member 44 is sandwiched and fixed.

[1-7] Solid gather:
In order to prevent side leakage of urine excreted by the wearer, a three-dimensional gather may be provided. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, urine is excreted on the top sheet, and even if the urine diffuses along the top sheet, the three-dimensional gather becomes a breakwater, from the opening around the leg of the diaper, etc. Leakage (so-called “lateral leakage”) can be effectively prevented.

  The structure of a three-dimensional gather can employ | adopt the structure used for the conventional disposable diaper and other absorbent articles. For example, a stretchable material (a three-dimensional gathered stretchable material) disposed on a part of the water-repellent sheet material and a sheet (gather) formed on the sheet material by the three-dimensional gathered stretchable material can be suitably used.

[2] Manufacturing method:
Hereinafter, an example of a method for producing the disposable diaper of the present invention will be described with reference to FIG. Note that FIG. 9 is drawn in a form in which a part of the leg stretchable material, the waist stretchable material, and the abdominal stretchable material are discarded for the convenience of drawing. In FIG. 9, only the second roll 70 is shown in the elastic material cutting roll 50, but a first roll (not shown) is arranged at a position opposite to the second roll 70.

[2-1] Formation of absorbent main body:
First, as shown in FIG. 9, a pad-shaped absorbent main body 14 in which an absorbent body 22 is interposed between a top sheet and a back sheet is manufactured. For example, the absorber 22 wrapped in a hydrophilic sheet is disposed on the upper surface of the back sheet, and the top sheet is further disposed on the upper surface. Subsequently, the absorptive main body 14 is obtained by sealing the peripheral part of the absorber 22 so as to be sandwiched between the top sheet and the back sheet. The absorbent main body 14 has a three-dimensional gather 26, which is a leak-proof wall that can stand up three-dimensionally, by separately attaching a sheet material. These processes can be manufactured by a continuous manufacturing process by using a long sheet material as a constituent material of each member.

[2-2] Formation of exterior member continuum:
Next, an exterior member continuum comprising two sheet members 49 (49a, 49b), and a long waist elastic member 42, leg elastic member 40, and belly elastic member 44 are continuously provided between the two sheets 49 (49a, 49b). Form. At this time, at least the abdominal stretchable material 44 is a long length made of rubber having a tensile stress at the time of 300% elongation in the second reciprocating path of 40 gf or less when it is repeatedly stretched between 100% and 500%. These stretchable materials are continuously arranged at an elongation rate of 350 to 500%. As the sheet material, a nonwoven fabric sheet is usually used.

  At this time, at least for the elastic material around the abdomen, when repeated expansion / contraction between 100% and 500% of the expansion rate, the tensile stress at the time of 300% expansion in the second reciprocation is 300% expansion in the second reciprocation. It is preferable to use rubber showing a value of 75% or more of the tensile stress at the time.

  The long waist elastic member 42, leg elastic member 40, and belly elastic member 44 are fixed to a sheet material 49 made of a nonwoven fabric or the like using a hot melt adhesive or the like. At this time, the hot melt adhesive is not applied to the position overlapping with the absorbent main body 14 (particularly the absorber 22), or the application amount is reduced, and the stretchable material is not fixed to the sheet material 49, or the adhesion amount is low. Leave it in a state. By doing this, the elastic material snaps back when the elastic material is cut later, so that the elastic force does not act on the part overlapping the absorber, and the necessary elastic force can be applied to the other parts. It becomes possible.

  The “part other than the part corresponding to the part where the absorber is disposed” refers to a part of the sheet material corresponding to a part between the waist opening and the leg opening when the diaper is used. Thus, it means a portion corresponding to a portion between the side edge of the absorber and the side edge of the diaper.

  In addition, “at least applying an adhesive to a portion other than the portion corresponding to the arrangement portion of the absorber” (a) applying an adhesive to a portion other than the portion corresponding to the arrangement portion of the absorber to absorb In addition to not applying the adhesive to the part corresponding to the arrangement part of the body, (b) the part corresponding to the arrangement part of the absorber by applying the adhesive to the part other than the part corresponding to the arrangement part of the absorber This also means that the adhesive is applied to the substrate, but the amount applied is smaller than that of the portion. In other words, the stretchable material is not fixed to the sheet material at the position where the absorber is disposed, or the stretchable material is fixed to the sheet material with a weak adhesive force.

[2-3] Cutting elastic material:
Furthermore, the long stretchable material arranged on the exterior member continuous body, that is, the belly stretchable material is cut in a region overlapping the placement region of the absorber.

  The method shown in FIG. 9 is an example in which an elastic material is cut using an elastic material cutting roll. For example, a first roll 54 having a plurality of cutting protrusions 52, such as a stretchable material cutting roll 50 shown in FIGS. 6 and 7, and a second roll 70 arranged to face the first roll 54. The elastic material is cut using the elastic material cutting roll provided with

  More specifically, the exterior member continuous body formed as described above is sandwiched between the elastic material cutting rolls 50 and pressurized, and the leg elastic material 40 and the belly elastic material 44 are cut. In the disposable diaper of the present invention, at least the belly elastic member 44 may be cut, but the leg elastic member 40 that may be attached to the position where the absorber 22 is disposed is also the same as the belly elastic member 44. It is preferable to cut similarly.

  At this time, it is also preferable to use a roll with a built-in heater and to cut the stretchable material while heating. In the illustrated example, the elastic material cutting roll 50 shown in FIGS. 6 and 7 is used as the elastic material cutting roll, and the leg elastic material 40 and the belly elastic material 44 attached to the exterior member continuous body are cut. is there. In this example, cutting marks 64a, 64b, 64c, 64d, and 64e as shown in FIG. 8 are formed on the back surface (the outer surface of the diaper) of the sheet material 49 by a first roll (not shown). ing.

  The shape of the cutting protrusion is not particularly limited, and various shapes such as a rectangular shape, a dot shape, a circular shape, and a lattice shape can be employed. Especially, the plate-shaped cutting protrusion (cutting blade) with the high effect which cut | disconnects an elastic material can be used suitably.

  The overall shape of the first roll is not particularly limited, but usually a cylindrical shape, for example, a shape similar to a conventionally known emboss roll is used. Although the material is not particularly limited, a metal material can be preferably used.

  As a specific form of the second roll, there can be mentioned an embossing roll formed with a recess that can be fitted to the cutting projection attached to the first roll and a plain roll without a recess. The plain roll has the advantage that it does not require the operation of forming a recess in accordance with the shape of the cutting projection of the first roll, and is easy to manufacture. Moreover, compared with the embossing roll, the alignment with the cutting protrusion of the first roll is unnecessary, which is preferable in that the adjustment of the machine is easy.

  In the illustrated method, the stretchable material around the abdomen is placed in a region that does not overlap with the placement region of the absorber by cutting the stretchable material continuously after being placed continuously. Is not limited to such a method. For example, in the same manner as the absorbent article described in Patent Document 2, a method of intermittently arranging an elastic tape in which an elastic material is bonded to a sheet-like support, and in an area that does not overlap with the arrangement area of the absorbent body, An elastic material may be arranged.

[2-4] Formation of diaper continuum:
Furthermore, after disposing and fixing the absorbent main body 14 intermittently in the longitudinal direction of the exterior member continuous body, a portion corresponding to the opening around the leg is cut out to form the hole 24. Then, after folding so that the side edges of the exterior member continuous body to which the absorbent main body 14 is fixed overlap each other, the gap portion of the absorbent main body 14 that is intermittently disposed and fixed is joined to the diaper side An edge joint 8 is formed to form a diaper continuum.

  In the example shown in FIG. 9, after being folded so that the side edges of the exterior member continuum overlap each other (so that the upper edge of the drawing overlaps the lower edge of the drawing), they are arranged and fixed intermittently. The gap part of the absorptive main body 14 is joined in a line shape by heat sealing, and the diaper continuous body is formed by forming the joint part 8 on the diaper side edge.

[2-5] Production of pants-type disposable diapers:
Finally, a plurality of pants-type disposable diapers can be obtained by cutting the diaper continuous body at the joint 8 portion.

  The disposable diaper of the present invention can be used as an absorbent article for infants or for adults such as the elderly and disabled persons who need nursing care.

It is a front view showing one embodiment of the disposable diaper of the present invention. It is a rear view of the disposable diaper shown in FIG. It is a schematic perspective view which shows one embodiment of the conventional disposable diaper, and is the figure which shows the state which looked at the conventional disposable diaper from the front. It is a schematic plan view which shows one Embodiment of the manufacturing method of the conventional disposable diaper. It is a schematic perspective view which shows another embodiment of the conventional disposable diaper, and is a figure which shows the state which looked at the conventional disposable diaper from the front. It is a schematic sectional drawing which shows typically one Embodiment of the manufacturing apparatus used for manufacture of the disposable diaper of this invention. It is a schematic front view which shows one Embodiment of the elastic material cutting roll which is a part of manufacturing apparatus of FIG. It is a schematic plan view which shows the state which expand | deployed the disposable diaper manufactured using the elastic material cutting roll shown in FIG. It is a schematic plan view which shows one Embodiment of the method of manufacturing the disposable diaper of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100,110: Disposable diaper, 2: Front body, 4: Crotch part, 6: Back body, 8: Joint part, 10: Opening around waist, 12, 12a, 12b: Opening around leg, 14: Absorption Sex body, 16: exterior member, 18: top sheet, 20: back sheet, 22: absorber, 24: hole, 26: three-dimensional gather, 40: elastic material around leg, 42: elastic material around waist, 44: belly circumference Stretch material, 49, 49a, 49b: sheet material, 50: stretch material cutting roll, 52: cutting projection, 54: first roll, 56a, 56b, 56c, 56d, 56e: region, 64a, 64b, 64c, 64d, 64e: Cutting trace, 70: Second roll, 74: Delivery roll.

Claims (3)

An absorber, a top sheet that is arranged so as to cover the surface of the absorber, and at least partly made of a liquid permeable material, and a back sheet that is arranged so as to cover the back surface of the absorber. And a back sheet
It consists of each part of the front body, the crotch part and the back body, and the corresponding side edges of the front body and the back body are joined together to form one waist opening and a pair of leg openings.
An abdomen elastic member disposed in a portion between the waist opening and the leg opening;
When the stretch around the abdomen is repeatedly stretched between 100% and 500% in stretch rate, a long stretch material made of rubber having a tensile stress at the time of 300% stretch in the two-way forward path of 40 gf or less, The disposable diaper which is continuously arrange | positioned by the extension rate of 350-500% in the area | region which does not overlap with the arrangement | positioning area | region of the said absorber.   When the stretchable material around the abdomen is repeatedly stretched between 100% and 500%, the tensile stress at 300% extension in the second round return path is the tensile stress at 300% extension in the second round trip path. The disposable diaper according to claim 1, wherein the disposable diaper is made of rubber exhibiting a value of 75% or more. Further comprising a waist stretchable material that is continuously disposed in a stretched state along the waist opening,
The disposable diaper according to claim 1 or 2, wherein the stretch rate at which the waist stretchable material is disposed is lower than the stretch rate at which the waist stretchable material is disposed.

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