JP2006247010A - Disposable absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper with excellent wearing feel, capable of being effectively manufactured. <P>SOLUTION: A diaper body 34 comprises a rear back part 31 to be applied to the back of a user, a front abdomen part 32 to be applied to the abdomen of the user, and a crotch part 33 continuously provided between the rear back part 31 and the front abdomen part 32. A vertically long absorber 35 is disposed in the crotch part 33 from the rear back part 31 to the front abdomen part 32, and three-dimensional gathered parts 68 which can be raised inward are disposed on both sides in the cross direction of the absorber 35 along the longitudinal direction. The absorber 35 has a liquid-absorbent mat part 42 which is formed in a prescribed shape and which has liquid retaining properties. The liquid-absorbent mat part 42 consists of one layer of a mat body 44, and the length of each three-dimensional gathered part 68 is 68-72% of the length of the longitudinal direction of the absorber 35. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to improvements in disposable absorbent articles such as pants-type disposable diapers.

  Conventionally, as a disposable absorbent article of this type, for example, there is a pants-type disposable diaper, and in its unfolded state, as shown in FIG. 5, the back portion 1 applied to the wearer's back and the abdomen A front abdomen 2 to be applied, and a crotch 3 which is provided between the back abdomen 1 and the front abdomen 2 and is formed in a slightly narrow shape with both sides being notched and applied to the wearer's crotch. It is set as the structure provided with the so-called vertically long absorber 5 stuck to the crotch part 3 from the back part 1 to the front part 2.

  As shown in FIG. 6, the diaper main body 4 includes an inner layer sheet 6 and an outer layer sheet 7 that are joined together in a polymerized manner, and the inner layers corresponding to the waist and the abdomen in the back part 1 and the front part 2, respectively. Between the sheet 6 and the outer layer sheet 7, the waist gathering elastic member 8 and the body gathering forming elastic member 9 are respectively disposed in an expanded state, and in the portion corresponding to the leg portion in the crotch portion 3. The leg gathering elastic member 10 is interposed in an extended state.

  The diaper main body 4 is folded in two so that both end portions of the back portion 1 and both end portions of the front abdomen 2 are joined to each other by ultrasonic welding or the like, and a waist opening portion and a pair of leg opening portions. It is comprised in what is called a pants type.

  In addition, as shown in FIG. 7, the absorbent body 5 includes a liquid-absorbing mat portion 12 having liquid retention, and a liquid-permeable covering sheet 13 that covers the liquid-absorbing mat portion 12 so as to wrap it. The structure is formed into a predetermined shape. And the liquid absorption mat part 12 is shown in FIG. 5 and FIG. 9 with the upper layer liquid absorption part 12a which wrapped the large-sized upper layer mat body 14 as shown in FIG. 5 and FIG. Thus, the lower layer mat body 16 having a slightly smaller shape than the upper layer mat body 14 and the lower layer liquid-absorbing portion 12b wrapped with the liquid-permeable sheet 17 is used.

  Further, side sheets 18 are joined along the longitudinal direction on both sides of the absorbent body 5 in the width direction on the skin surface side, and the elastic for forming a three-dimensional gather is formed on the inner edge of each side sheet 18. A member 19 is interposed in an extended state.

  Moreover, the end press sheet | seat 20 by which the longitudinal direction both ends of the absorber 5 were each joined to the back part 1 and the front part 2 by superposition | polymerization so that the both ends of the stuck absorber 5 may not contact skin directly, As shown in FIG. 6, the end portion of the outer layer sheet 7 is folded to the upper surface side of the end presser sheets 20 and 21 and joined in a superposed manner, as shown in FIG. It was.

  As such a pants-type disposable diaper, there exists a thing as disclosed in patent document 1, for example.

  Further, as a line for manufacturing such disposable diapers, the absorbent body 5 sequentially manufactured in the absorbent body manufacturing line is sequentially supplied on the crotch part 3 of the diaper main body 4 sequentially manufactured in a continuous manner in the main manufacturing line. Then, the end presser sheets 20 and 21 are joined.

  After that, in a state where the back portion 1 and the front abdomen 2 are folded back so as to be superposed with each other, they are joined to each other by ultrasonic welding or the like at positions corresponding to both side ends of the back portion 1 and the front portion 2, Generally, a method of sequentially manufacturing a desired disposable diaper by cutting at a predetermined position is employed. For example, there is one disclosed in Patent Document 2.

JP-A-8-280739 JP 2001-314441 A

  On the other hand, as a method of using such a disposable diaper, a user who uses it as a so-called diaper cover method that saves the number of disposable diapers used by exchanging only the urine removing pad and using it together with the urine removing pad. There are also many.

  Thus, when using a disposable diaper as a diaper cover system, since the absorber 5 is made into the two-layer structure provided with the upper layer mat body 14 and the lower layer mat body 16, it is what is called three layers by combined use of the urine absorption pad. It became a structure, and when it was worn, there was a considerable feeling of stiffness, and there was a difficulty in wearing.

  Therefore, when the lower layer absorbent body 12b on the lower mat body 16 side is simply omitted, and the absorbent body 5 has a single layer structure consisting only of the upper liquid absorbent section 12a on the upper mat body 14 side, there is a feeling of stiffness when worn. It is considered that the feeling of wear is improved and the feeling of wearing can be improved.

  However, when the absorbent body 5 has a single-layer structure composed only of the upper layer liquid-absorbing portion 12a, the rigidity of the absorbent body 5 itself is weakened. Therefore, the three-dimensional gather is caused by the contraction force of the three-dimensional gather forming elastic member 19 interposed in the expanded state. When the absorbent body 5 is supplied and pasted on the crotch 3 of the diaper body 4 in the disposable diaper production line, it is supplied in a predetermined posture. It is spicy and there is a great risk of sticking failure.

  Then, the problem which should be solved by this invention aims at providing the disposable absorbent article which can be manufactured favorably and is excellent in a feeling of wear.

  In order to solve the above problems, the invention of claim 1 comprises a back part applied to the back part, a front part applied to the abdomen, and a crotch part provided continuously between the back part and the front part, Disposable in which a crotch part is provided with a vertically long absorbent body extending from the back part to the front abdomen, and a three-dimensional gather part capable of standing inward along the longitudinal direction of both sides in the width direction of the absorbent body In the absorbent article, the absorbent body includes a liquid-absorbing mat portion having a liquid retaining property formed into a predetermined shape, and the liquid-absorbing mat portion is composed of a single mat body, and the length of each three-dimensional gathered portion. However, it is set as the structure made into 68 to 72% of the longitudinal direction length of the said absorber.

  Moreover, in invention of Claim 2, in the disposable absorbent article which concerns on invention of Claim 1, it is set as the structure by which the length of each said solid gather part is 355-370 mm.

Furthermore, in invention of Claim 3, in the disposable absorbent article which concerns on invention of Claim 1 or Claim ^2, it is set as the structure whose basic weight of the pulp fiber contained in the said mat body is 170-200 g / m < ² >. Yes.

  Moreover, in invention of Claim 4, in the disposable absorbent article which concerns on any invention of Claim 1 thru | or 3, the said three-dimensional gather part of the said absorber has an identification color different from the other site | part of an absorber. It has a structure with.

  In the disposable absorbent article according to the first aspect of the present invention, the absorbent body is provided with a liquid-absorbing mat portion having a liquid retaining property formed into a predetermined shape, and the liquid-absorbing mat portion is formed from a single mat body. The length of each three-dimensional gather portion is 68 to 72% of the longitudinal length of the absorber, and even if the absorber is a single-layer structure consisting of a single mat body, Since the length is shortened compared to the conventional one, the shape deforming action of the absorbent body due to the shrinkage force of the three-dimensional gather part is reduced, and the occurrence of defects during the production of disposable absorbent articles can be effectively prevented, and there is an advantage that it can be produced satisfactorily. is there.

  In addition, since the absorbent body has a single-layer mat structure, the so-called thin-type disposable absorbent article is obtained, and there is an advantage that the wear feeling is excellent. Therefore, even when used in combination with a urine absorbing pad as described above, there is an advantage that the feeling of stiffness is effectively eliminated and the feeling of wearing is excellent.

  Moreover, according to invention of Claim 2, since the length of each solid gather part is set to 355-370 mm, the shape deformation effect | action by a solid gather part can be reduced effectively, and disposable disposable articles of The occurrence of defects during production can be effectively prevented, and a length that does not hinder the three-dimensional gather portion can be secured.

Furthermore, according to invention of Claim 3, it is set as the structure whose basic weight of the pulp fiber contained in a mat body is 170-200 g / m < ² >, Even if a mat body is an absorber of a single layer structure. There is an advantage that moderate rigidity and moderate liquid absorption performance can be exhibited, and the occurrence of defects during the manufacture of disposable absorbent articles can be effectively prevented.

  Further, according to the invention described in claim 4, since the three-dimensional gather portion of the absorber has a structure having an identification color different from that of other parts of the absorber, the position of the three-dimensional gather portion can be easily visually confirmed. In addition, when the urine absorption pad is used in combination, the urine absorption pad can be easily and quickly disposed between the compatible body gather portions, and there is an advantage that it is excellent in usability.

<Embodiment>
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, a pants-type disposable diaper 30 as an example of a disposable absorbent article is placed on the back of a wearer as described above. The back part 31 to be applied, the front part 32 to be applied to the abdomen, the back part 31 and the front part 32 are provided continuously between the back part 31 and the front part 32, and both sides are notched and formed slightly narrow. A diaper main body 34 having a crotch portion 33 applied to the crotch portion of the diaper, and a so-called vertically long absorbent body 35 attached to the crotch portion 33 from the back portion 31 to the front abdomen portion 32 by a hot melt adhesive or the like. It is structured.

  Then, both end portions 31a of the back portion 31 and both end portions 32a of the front abdominal portion 32 in the diaper main body 34 folded in two are joined to each other by ultrasonic welding or the like to form a joint portion 61. As shown in FIG. 1, a circumferential annular waist opening 62 is formed by the back portion 31 and the front abdomen 32, and leg opening 63 is formed on both sides of the crotch portion 33. It is configured as a pants type.

  As shown in FIG. 3, the diaper main body 34 includes an inner layer sheet 36 and an outer layer sheet 37 that are joined together in a polymerized manner by a hot melt adhesive or the like. A waist gather forming elastic member 38 and a body gather forming elastic member 39 are interposed between the inner layer sheet 36 and the outer layer sheet 37 corresponding to the surroundings in an extended state, respectively. A waist gathering portion 65 and a body gathering portion 66 that flexibly fit around the waist and the abdomen are configured by the elastic action of the gather forming elastic member 39.

  Further, a leg gather forming elastic member 40 is interposed between the inner layer sheet 36 and the outer layer sheet 37 corresponding to the periphery of the legs in the crotch portion 33, and the leg gather forming elastic member 40 is expanded and contracted. Leg gathers 67 that fit flexibly around the legs are configured.

  The inner layer sheet 36 and the outer layer sheet 37 are formed of a water-repellent sheet material, for example, a water-repellent nonwoven fabric such as a spunbond nonwoven fabric. The elastic members 38, 39, and 40 are made of elastic elastic materials (polyurethane yarn, polyurethane film, natural rubber, etc.) that are usually used in disposable diapers, and are hot melt adhesives, heat welds, ultrasonic waves in the stretched state. It is set as the structure stuck on each predetermined site | part by sticking means, such as welding.

  As shown in FIG. 4, the absorbent body 35 includes a liquid-absorbing mat portion 42 having a liquid retaining property, and a liquid-permeable covering sheet 43 covering the liquid-absorbing mat portion 42 so as to wrap the same. The structure is formed into a shape. In the present embodiment, as shown in FIGS. 2 and 4, the liquid-absorbing mat portion 42 is a single layer in which a mat body 44 having the same shape as the upper-layer mat body 14 of the conventional structure is wrapped with a liquid-permeable sheet 45. It is a single layer structure consisting of only.

At this time, the mat body 44 in the liquid absorbent mat portion 42 has a basis weight of pulverized pulp fibers of 170 to 200 g / m ² , and a granular polymer absorber, that is, a basis weight of the water absorbent polymer sap of 130 to 180 g / m ^2. The mixture is formed as m ² , and the lump is wrapped with a liquid permeable sheet 45 such as a paper sheet such as tissue paper or a liquid permeable nonwoven sheet, and is formed into a predetermined shape. In the present embodiment, for example, the mat body 44 has a basis weight of pulp fibers of approximately 180 g / m ² (weight is 12.0 g) and a basis weight of the water-absorbing polymer sap is approximately 135 g / m. ² (8.5 g in weight), which is a mixed structure.

On the other hand, in the liquid-absorbing mat portion 12 in the conventional two-layer structure, for example, the upper-layer mat body 14 has a basis weight of pulp fibers of approximately 151 g / m ² (weight is 9.5 g) and water absorbency. The basis weight of the polymer sap is about 135 g / m ² (weight is 8.5 g), and these are mixed. The lower mat body 16 has a pulp fiber basis weight of about 136 g / m ² ( The basis weight of the water-absorbing polymer sap was about 170 g / m ² (7.5 g by weight), and a mixture of these was obtained.

  Accordingly, the mat body 44 is inferior in liquid-absorbing performance compared with the conventional case where the upper layer mat body 14 and the lower layer mat body 16 have a two-layer structure, but either the upper layer mat body 14 or the lower layer mat body 16 is used. In this embodiment, the liquid absorption mat portion 42 has a so-called thin type structure as compared with the two-layer structure like the conventional liquid absorption mat portion 12. ing.

  In addition, the covering sheet 43 may be configured with a liquid-permeable nonwoven fabric or the like on both the top sheet 43a on the skin surface side and the back sheet 43b covering the other periphery, or at least the top sheet 43a is liquid-permeable. The back sheet 43b may be formed of a water-repellent nonwoven fabric or the like.

  Further, side sheets 48 are bonded to both sides of the absorbent body 35 in the width direction on the skin surface side along the longitudinal direction thereof by a hot-melt adhesive or the like. A three-dimensional gather forming elastic member 49 is interposed in an extended state. And the three-dimensional gather part 68 standing up inward is comprised by the expansion-contraction action of these three-dimensional gather formation elastic member 49 so that it may be pressed flexibly against a wearer's skin side. Such a side sheet 48 is constituted by a liquid-impervious sheet, such as a liquid-impervious plastic film or a water-repellent nonwoven fabric. Further, the elastic member 49 for forming a three-dimensional gather is made of a stretchable material similar to that of the elastic members 38, 39, and 40, and similarly has a structure in which it is adhered to a predetermined site with a hot melt adhesive or the like.

  In particular, in the present embodiment, for example, a stretchable material colored in blue or the like is used as the elastic member 49 for forming a three-dimensional gather, and other portions of the absorber 35 are configured in white. Here, the three-dimensional gather portion 68 has a structure including a three-dimensional gather forming elastic member 49 having an identification color different from other portions of the absorber 35.

  At this time, the length P of each of the left and right three-dimensional gather portions 68 is set to 68 to 72% of the longitudinal length Q of the absorber 35. For example, when the longitudinal length Q of the absorber 35, that is, the total length is 515 mm, the length P of each three-dimensional gather portion 68 is 355 to 370 mm. In the present embodiment, the longitudinal length Q of the absorber 35 is Is 515 mm, and the length P of each three-dimensional gather portion 68 is 360 mm.

  On the other hand, in the disposable diaper as a conventional example shown in FIG. 5, when the longitudinal length S of the absorbent body 5, that is, the total length is 515 mm, the length R of each three-dimensional gathered portion 23 is 385 mm. It was.

  Further, both ends of the absorbent body 35 in the longitudinal direction are joined to the back portion 31 and the front portion 32 in a polymerized manner by a hot melt adhesive or the like so that both ends of the stuck absorbent body 35 do not directly touch the skin. The end presser sheets 50 and 51 are covered. At this time, as shown in FIGS. 2 and 3, each end pressing sheet 50, 51 is formed in a band shape narrower than the region of the back portion 31 and the front abdomen 32, and the region of the back portion 31 and the front abdomen 32 In the region of the waist gathers 65 and the body gathers 66 around the so-called waist and abdomen, a structure in which a two-layer region 52 composed of an inner layer sheet 36 and an outer layer sheet 37 without the end presser sheets 50 and 51 is formed. Has been.

  And as FIG. 3 shows, the edge part of the outer layer sheet | seat 37 is made into the structure where each end part upper side of the inner layer sheet | seat 36 was folded and it joined by superposition | polymerization.

  Moreover, each end pressing sheet | seat 50 and 51 is set as the structure which consists of a spun bond nonwoven fabric which has water repellency in this embodiment.

  This embodiment is configured as described above, and the length P of the three-dimensional gathered portion 68 is set to the conventional length even if the liquid-absorbing mat portion 42 in the absorber 35 is a single layer structure composed of a single mat body 44. Since the structure is shortened compared to the length R, the shape deforming action of the absorbent body 35 due to the contraction force of the three-dimensional gather portion 68 is reduced, and here, the absorbent body 35 is made to be a diaper when the disposable diaper 30 is manufactured. When supplying and sticking on the crotch part 33 of the main body 34, the absorbent body 35 can be efficiently supplied in a predetermined posture, so that the occurrence of sticking failure can be effectively prevented, and there is an advantage that it can be manufactured satisfactorily.

  In addition, since the absorber 35 has a single layer structure with a single mat body 44, the absorber 35 is formed thinner than the conventional absorber 5 having a two-layer structure. There is also an advantage that it becomes a disposable diaper 30 of the type and is excellent in wearing feeling. Therefore, when the disposable diaper 30 is used in the diaper cover system as described above, the feeling of stiffness when used in combination with the urine absorbing pad is effectively eliminated, and there is an advantage that the wearing feeling is excellent. Moreover, according to a wearer's normal urine volume, the wearing by the disposable diaper 30 single-piece | unit and the wearing which used the pad for urine collection together can be selected suitably, and there exists an advantage which is excellent also in versatility.

  Furthermore, since the length of each three-dimensional gather part 68 is configured to be 360 mm, the absorbent body 35 can be efficiently supplied in a predetermined posture during the production of the disposable diaper 30, and the occurrence of sticking failure can be effectively prevented. A sufficient length that does not hinder the function of the three-dimensional gather portion 68 when worn can be effectively secured.

Further, from the absorber 5 in the conventional two-layer structure, the lower layer liquid absorber 12b on the lower mat body 16 side is simply omitted, and the absorber 5 is a single layer composed only of the upper liquid absorber 12a on the upper mat body 14 side. Compared with the structure, the basis weight of the pulp fibers contained in the mat body 44 is approximately 180 g / m ² and the basis weight of the water absorbent polymer sap is approximately 135 g / m ² as in the present embodiment. By adopting a structure in which these are mixed, even when the mat body 44 is a single-layer absorber 35, it is possible to exhibit stronger and appropriate rigidity and higher and appropriate liquid absorption performance, and absorption during the production of the disposable diaper 30. There exists an advantage which can prevent effectively the defect generation | occurrence | production of the sticking state by the supply defect of the body 35 effectively.

  Further, the three-dimensional gather forming elastic member 49 in each three-dimensional gather portion 68 of the absorbent body 35 has a structure having a blue identification color different from the other parts of the absorbent body 35. Therefore, the three-dimensional gather forming elastic member The positions of the three-dimensional gathered portions 68 on both sides can be easily visually recognized by the identification color 49, and when using the urine collecting pads of the disposable diaper 30 together, the urine collecting pads are arranged between the compatible body gathered portions 68. In this case, it can be arranged easily and quickly, and there is an advantage that it is easy to use.

  In addition, since the end pressing sheets 50 and 51 have a structure made of a spunbonded nonwoven fabric having water repellency, urine leakage from the absorber 35 side to the back portion 31 side and the front abdomen 32 side can be effectively prevented, A feeling of wear can be improved.

  In addition, in the said embodiment, although the structure which made each solid gathering formation elastic member 49 in the solid gathering part 68 the blue discriminating color different from the other site | part of the absorber 35 is shown, the solid gathering part 68 is comprised. The side sheet 48 itself may have an identification color different from other parts, and is not limited to the structure of the embodiment.

  Moreover, in the said embodiment, although the structure employ | adopted as what is called a pants-type disposable diaper 30 is shown as a disposable absorbent article, it is a disposable diaper which can attach and detach the front and rear of a diaper detachably with a desorption tape etc. The structure of the embodiment is not limited at all.

It is a perspective view of the disposable diaper which concerns on embodiment of this invention. FIG. It is the III-III sectional view taken on the line of FIG. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. It is an expanded view of the disposable diaper which concerns on a prior art example. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is the VII-VII sectional view taken on the line of FIG. It is a top view of the same layer mat body. It is a top view of the same lower layer mat body.

Explanation of symbols

30 disposable diapers, 31 dorsal part, 32 front abdomen, 33 crotch part, 34 diaper body, 35 absorbent body, 36 inner layer sheet, 37 outer layer sheet, 38 waist gather forming elastic member, 39 body gather forming elastic member, 40 leg Gather forming elastic member, 42 Liquid absorbing mat portion, 43 Cover sheet, 44 Mat body, 48 Side sheet, 49 Three-dimensional gather forming elastic member, 50 End pressing sheet, 51 End pressing sheet, 65 Waist gather portion, 66 Body gather Part, 67 leg gather part, 68 solid gather part.

Claims (4)

A back part that is applied to the back part, a front part part that is applied to the abdomen, and a crotch part that is provided between the back part and the front part of the abdomen. And a disposable absorbent article comprising a three-dimensional gathered portion that can stand up inward along the longitudinal direction of both sides in the width direction of the absorbent body.
The absorbent body is provided with a liquid-absorbing mat portion having liquid holding properties formed into a predetermined shape, and the liquid-absorbing mat portion is composed of a single mat body,
The length of each said three-dimensional gather part is 68 to 72% of the longitudinal direction length of the said absorber, The disposable absorbent article characterized by the above-mentioned. The disposable absorbent article according to claim 1,
The length of each said three-dimensional gather part is 355-370 mm, The disposable absorbent article characterized by the above-mentioned. The disposable absorbent article according to claim 1 or 2,
Disposable absorbent article basis weight of the pulp fibers contained in the mat body is characterized in that it is a 170~200g / m ^2. The disposable absorbent article according to any one of claims 1 to 3,
A disposable absorbent article, wherein the three-dimensional gathered portion of the absorbent body has a structure having an identification color different from other parts of the absorbent body.

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