JP3801567B2 - Infant diapers that are easy to put on standing - Google Patents

Description

【００３９】
＜性能評価＞
実施例及び比較例の使い捨ておむつについて、立位装着の容易性、尿漏れ防止性能、軟便空間保持性をそれぞれ下記評価方法及び評価基準で評価した。結果を表２に示した。
１）立位装着の容易性（装着のし易さの評価）
装着方法は、幼児モデルを立たせておいて、紙おむつのファスニングテープを着用者の腹側においてランディングゾーンに止着する方法（腹側装着）とし、立位での装着のし易さを評価した。
（評価基準）
立位での装着においてずれることなくきちんとおへそ位置に装着できた場合を○とし、装着途中ずれておへそ下で止着せざるをえなくなった場合を×とした。
【００４０】
２）尿漏れ防止性能（動的股モレ評価法）
腹側装着により幼児腰部モデル（立位で両脚を前後させる歩行運動及び股間部からの人工尿の注入が可能であり、形態的に幼児の腰部を模してあるモデル）に使い捨ておむつを装着し、下記方法で動的股モレ値を測定した。
股モレ値測定においては、先ず使い捨ておむつを上記の幼児モデルに装着し（腹側先端オヘソ位置）、１５０歩/分の歩行速度で５分間歩行運動させた。その後、歩行運動を停止し、チューブを介しておむつ５ｇ／秒の速度で８０ｇの人工尿を注入し、さらに５分間歩行運動を行なわせた。その後、モデルを横寝にし、５ｇ／秒の速度で４０ｇの人工尿を注入し、４０ｇの注入が終了した時点で漏れていないかを目視にてチェックした。漏れが生じていないものについては、更に４０ｇの人工尿の注入を行ない、この様な操作を漏れるまで繰り返した。そして尿の漏れが観察された時点における人工尿の合計注入量を動的股モレ値とした。
【００４１】
３）軟便空間保持性（軟便移動性の評価）
腹側装着により幼児姿勢可変モデル（立位での歩行・座位での脚の開閉・立→座位の姿勢変化運動及び股間部からの人工尿・人工便の注入が可能であり、形態的に幼児の腰部を模してあるモデル）におむつを装着し、下記方法で軟便移動性能評価を行った。
測定方法は、先ず使い捨ておむつを上記の幼児モデルに装着し（おむつの腹側先端をオヘソの位置に合わせた）、１５０歩/分の歩行速度で５分間歩行運動させた（立位）。その後、歩行運動を停止し、チューブを介しておむつ５ｇ／秒の速度で８０ｇの人工尿を注入し、さらに５分間歩行運動を行なわせた。その後、モデルを座らせ脚を開いた状態で１６０ｇの人工便を１０ｇ／秒の速度で注入し、歩行・立位→座位の姿勢変化・座位での脚の開閉の活動を５分間繰り返し行なった。紙おむつを開閉し便の移動状態を観察した。
（評価基準）
人工Ｂ便が立体ギャザーを越えていた場合は×、越えていなかった場合は○とした。
【００４２】
【表２】

【００４３】
【発明の効果】
本発明によれば、立位での装着性に優れ、しかも吸収性能及び漏れ防止性能に優れた、展開型の使い捨ておむつを提供することができる。
【図面の簡単な説明】
【図１】図１は、本発明の一実施形態としての使い捨ておむつを、各部の弾性部材を伸張させ平面状に拡げた状態（緊張状態）を示す平面図である。
【図２】図２は、図１の使い捨ておむつの股下部の最小幅部分における断面（手方向中央線ＣＬに沿う断面）を示す模式断面図である。
【図３】図３は、図１の使い捨ておむつを、立ち上がった状態の幼児に立位装着する様子を示す図である。
【図４】図４（ａ）及び図４（ｂ）は、本発明の他の実施形態の使い捨ておむつの要部を示す平面図である。
【図５】図５は、おむつ非固定状態における立体ギャザーの伸張率と引張荷重（引張力）との関係を示すグラフである。
【符号の説明】
１ 使い捨ておむつ
２ 表面シート
３ 裏面シート
４ 吸収体
５ ファスニングテープ
６ 立体ギャザー
６１ 立体ギャザー弾性部材
７ レッグギャザー
７１ レッグ部弾性部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deployable disposable diaper that has excellent wearability in a sleeping position and a standing position, and also has excellent absorption performance and leakage prevention performance.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as disposable diapers, unfolded disposable diapers having a fastening tape and pants-type disposable diapers previously formed into pants are known, and unfoldable disposable diapers can be used from newborns and have a manufacturing cost. Is most commonly used because of its low cost.
[0003]
However, conventional unfoldable disposable diapers can be easily worn by a wearer (such as a baby) who is lying on his back (hereinafter also referred to as a sleeping position), but his activity has become active. When I was an early child, I rarely stay still in the sleeping position to change diapers, and I often hate being in the sleeping position. It ’s hard. In particular, when wearing the sleeping position is disliked, for example, when carrying out yes and running away, the wearing is not easy. Such a child will try to wear it on all fours or standing (hereinafter also referred to as standing position), but with conventional diapers, this is not easy to wear.
[0004]
One of the factors is that when wearing in the sleeping position, the diaper is sandwiched between the wearer's back and the floor (or bedding), and is not easily moved from the wearing position by the load of the wearer. On the other hand, in the case of wearing in a standing position, the diaper is not fixed anywhere, so the wearer must wear the diaper while keeping it from moving from the wearing position. Can be mentioned.
[0005]
Another factor is that conventional diapers are designed with a relatively wide diaper crotch width. In other words, when wearing the sleeping position, the legs can be worn with the legs wide open to the left and right, so even if the width of the diaper crotch is wide, the wearability is not significantly affected. Therefore, if the width of the lower part of the diaper crotch is wide, it will immediately lead to deterioration of the wearability. For this reason, it may be possible to narrow the width of the diaper crotch to improve standing fit, but it is difficult to reduce the width of the crotch without deteriorating the original absorption performance and leakage prevention performance of the diaper. is there.
[0006]
In particular, in a disposable disposable diaper in which a pair of three-dimensional gathers and a pair of leg gathers are formed on both sides in the longitudinal direction of the diaper, the interval between the three-dimensional gathers was narrowed in order to narrow the width of the diaper crotch part. In some cases, the required absorption performance cannot be obtained, and if the crotch width is narrowed while maintaining the width between the three-dimensional gathers, the pocket between the three-dimensional gathers and the leg gathers disappears, so excrement beyond the three-dimensional gathers leaks out. It becomes easy.
In short, an unfolded disposable diaper that has excellent absorption performance and leakage prevention performance and is sufficiently excellent in a standing position has not yet been provided.
[0007]
In this situation, parents begin to consider using pants-type diapers, but it is difficult to raise their legs while standing in infants who have just started standing, so eventually use pants-type diapers. I'm frustrated.
[0008]
Accordingly, an object of the present invention is to provide a deployable disposable diaper that is excellent in wearability in the sleeping position and standing position, and that is excellent in absorption performance and leakage prevention performance.
[0009]
[Means for Solving the Problems]
  The present invention is a diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent interposed between both sheets.Diapers for infants that can stand or yes yes,A pair of fastening tapes are provided on both side edges of one part in the longitudinal direction, and a pair of three-dimensional gathers and a pair of leg gathers are formed by disposing elastic members respectively on both sides in the longitudinal direction. The minimum width value of the crotch part of the diaper is 100 to 240 mm, and in the minimum width part of the crotch part, the distance W1 between the fixed ends of the pair of three-dimensional gathers and the outermost side of the pair of leg gathers An elastic member having a ratio (W1 / W2) to the distance W2 between the elastic members positioned between 0.67 and 0.81 and located on the outermost side of each leg gather from the fixed end of each solid gather The distance W3 is shorter than the height W4 of each three-dimensional gather, and the three-dimensional gather is arranged at an expansion rate of 100% or more, and the three-dimensional gather is stretched in an unfixed state of the diaper. The tensile load at an effective elongation rate defined as an elongation rate reduced by 30% from the elongation rate (%) in the diaper disposed state is 20 to 120 gf, and the elongation rate is from 20% to the effective elongation rate. The above-mentioned object is achieved by providing a baby diaper that can be easily put on in a standing position, with an increase rate of tensile load in between of 1.0 (gf /%) or less.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on a preferred embodiment thereof.
As shown in FIGS. 1 and 2, a disposable diaper 1 according to an embodiment of the present invention includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid holding member interposed between both sheets. Sex absorber 4 is provided. The disposable diaper 1 is an unfolded disposable diaper for infants, and has a crotch part A at the center in the longitudinal direction, and a pair of fastening tapes on both side edges before and after the crotch part A in the longitudinal direction. 5 has a first part (one part in the longitudinal direction) B and a second part C in which a landing zone 51 for fastening the fastening tape 5 is provided on the outer surface. The crotch part A is arranged at the crotch part (groin part) of the wearer (wearer) when worn.
[0011]
The disposable diaper 1 of the present embodiment has both side edges of the crotch part A formed in an arc shape, and has an hourglass-like shape with the central portion in the longitudinal direction constricted as a whole.
The top sheet 2 has a substantially rectangular planar view shape having an outer dimension larger than that of the absorber 4, and is arranged in the center in the width direction of the back sheet 3. The back sheet 3 has an hourglass-like outer shape that matches the outer shape of the diaper.
The top sheet 2 and the back sheet 3 extend outward from both side edges 41, 41 and both end edges 42a, 42b of the absorber 4, respectively, and are joined to each other at their extending portions. Both side portions of the back sheet 3 in the longitudinal direction extend outward in the width direction from both side edges of the top sheet 2.
[0012]
A pair of three-dimensional gathers 6 and 6 and a pair of leg gathers 7 and 7 are formed on both sides in the longitudinal direction of the disposable diaper 1 by disposing elastic members, respectively.
More specifically, each of the pair of three-dimensional gathers 6 is formed by disposing a three-dimensional gather forming sheet material 62 having an elastic member 61 so as to extend from the outer side to the inner side of both side edges of the top sheet 2. Has been. Each sheet material 62 is a surface sheet linearly extending in the longitudinal direction of the diaper between the side edge 41 of the absorbent body 4 and a leg elastic member 71 described later by a known joining means such as heat seal or adhesive. The fixed end 64 of the three-dimensional gather 6 is formed by the linear fixing portion. Each sheet material 62 is fixed on the top sheet 2 or the back sheet 3 at a portion located outward in the width direction from the fixed end 64, and more than the fixed end 64 in the vicinity of both longitudinal ends of the diaper. A portion located on the center side of the diaper width direction is fixed on the top sheet 2. The elastic members 61 arranged in the three-dimensional gathers 6 each have a thread shape, and a plurality of elastic members 61 are arranged substantially in parallel with the free ends 63 of the three-dimensional gathers 6.
[0013]
The pair of leg gathers 7 is formed by disposing a plurality of leg portion elastic members 71 and 71 substantially linearly on the outer side of the fixed end 64 of the three-dimensional gathers 6 and 6 in the diaper width direction. Has been.
The elastic member 61 and the leg elastic member 71 are both disposed along the longitudinal direction of the disposable diaper 1 and are disposed between the first part B and the second part C. ing
[0014]
The waist part D of the first part B and the second part C is provided with a waist elastic member 81 to form a waist elastic part 8, and both sides of the waist part E of the first part B. A plurality of waistline elastic members 91 are disposed in each part, and a pair of side stretchable parts 9 are formed. As shown in FIG. 1, the waistline E of the first part B has the disposable diaper 1 in a state (tensed state) in which the elastic member of each part is stretched and expanded in a flat shape, and the first part B side is on the upper side. When the second part C side is considered as the lower side, it is located below the part where the waist elastic member 81 is arranged and the crotch part (the part arranged on the wearer's inseam when worn, A portion formed in a concave shape so that the edge is along the leg) A portion located above A.
[0015]
As for this disposable diaper 1, the minimum width value of the crotch part A is 100-240 mm. If it is out of the width range, it is difficult to insert a diaper into the crotch without difficulty while the child's legs are slightly opened when standing, or urine leakage from the crotch is likely to occur. The minimum width value of the crotch part is preferably 100 to 230 mm, particularly 100 to 210 mm, and particularly preferably 120 to 200 mm, since the wearability at the standing position is improved.
[0016]
The disposable diaper 1 includes a distance W1 (see FIG. 2) between the fixed ends of the pair of three-dimensional gathers and the elastic members located on the outermost sides of the pair of leg gathers in the minimum width portion of the crotch A. The ratio (W1 / W2) to the distance W2 (see FIG. 2) is 0.67 to 0.81, preferably 0.70 to 0.78.
When the ratio (W1 / W2) is less than 0.67, when the minimum value of the crotch width at the crotch portion is within the scope of the present invention, the space between the three-dimensional gathers becomes small and the necessary absorption performance cannot be obtained. When the ratio (W1 / W2) is more than 0.81, since there is no pocket between the three-dimensional gather and the leg gather, excrement exceeding the three-dimensional gather is likely to leak.
[0017]
In the disposable diaper 1, the ratio (W1 / W2) is preferably in the range of 0.67 to 0.81 over a length of 50 mm or more in the longitudinal direction of the diaper, and in particular, the ratio (W1 / W2) is preferably within the above range over a length of 25 mm or more in the first part B side direction and the second part C side direction of the diaper longitudinal direction from the minimum width part of the crotch part.
In the disposable diaper of this embodiment, the width of the crotch part is the narrowest on the center line CL (refer FIG. 1) of the diaper which divides a diaper into 2 equal to a longitudinal direction (full length is equally divided into 2). In this way, the minimum width part of the crotch part should be at the approximate center of the diaper longitudinal direction, so that wearing ability and wearing when wearing fastening tape on the back side of a child who wants to escape standing or yes It is preferable in terms of preventing the later slipping off.
[0018]
The present disposable diaper 1 has a distance W3 (see FIG. 2) from the fixed end 64 of each three-dimensional gather 6 to the elastic member 71 located on the outermost side of each leg gather 7 at least in the minimum width portion of the crotch A. Each solid gather 6 is shorter than the height W4 (see FIG. 2).
If the distance W3 is not shorter than the height W4, it is not possible to satisfy the ease of standing installation and the absorption performance at the same time. From this viewpoint, the ratio (W3 / W4) between the distance W3 and the height W4 is preferably 0.45 to 0.83.
In addition, the height W4 of the three-dimensional gather 6 measures the length from the fixed end 64 to the free end 63 along the surface of the sheet material 62.
[0019]
In the present disposable diaper 1, the distance W3 is preferably shorter than the height W4 over a length of 50 mm or more in the longitudinal direction of the diaper, and in particular, the first part in the longitudinal direction of the diaper from the minimum width portion of the crotch part. It is preferable that the relationship of W3 <W4 is established over a length of 25 mm or more in the B side direction and the second part C side direction, respectively.
[0020]
The three-dimensional gather 6 in the present disposable diaper 1 has a low modulus and a high elongation rate.
The three-dimensional gather 6 is disposed on the disposable diaper 1 with an elongation rate of 100% or more, preferably with an elongation rate of 100 to 300%, particularly preferably with an elongation rate of 130 to 200%.
If the stretch rate of the three-dimensional gather 6 in the diaper arrangement state (the state in which the diaper is arranged) is less than 100%, the standing property of the tip of the three-dimensional gather is impaired at the time of wearing, and at the time of wearing in the standing position. Thus, when the leading end of the three-dimensional gather is guided to the crotch, the three-dimensional gather falls or hits the skin of the wearer, and it becomes difficult to wear it correctly. Further, when the wearer's posture changes, there is a high possibility that excrement will leak due to a gap between the tip of the three-dimensional gather and the wearer's skin. If the stretch rate is more than 300%, the diaper may be rounded in some cases, making it difficult to wear. In particular, when the diaper is inserted into the crotch part in the standing position, the diaper is displaced without stopping the tape part, and the wearing is very difficult. Moreover, even if it can be mounted, it is mounted in a state where it has already been displaced, making mounting very difficult. Moreover, even if it can be mounted, it is mounted in a state where it has already been displaced, leading to a decrease in fit and leakage performance.
[0021]
The expansion ratio of the three-dimensional gather 6 in the diaper arrangement state is measured as follows.
[Elongation rate of diaper installed state]
The three-dimensional gather was cut out from the diaper so as to include a portion located in the central part of the diaper longitudinal direction, and separated at the time when it was extended to the maximum (when extended to the length in the diaper arrangement state shown in FIG. 1). When the length of the section H between two points is H, and then the extension is released and the length H of the section H measured in the natural state, that is, in the state where the cut-out gathers are naturally contracted, the following formula (1 ).
Elongation rate (%) = (H−h) / h × 100 (1)
The length h in the natural state is measured on a flat plate or the like while applying as little load as possible and minimizing unevenness due to gathers. The length H of the section is preferably about 200 mm.
[0022]
Further, when the three-dimensional gather 6 is stretched in a diaper non-fixed state (a state in which the three-dimensional gather is not fixed to the diaper, that is, a state in which the three-dimensional gather is cut out from the diaper), the stretch rate (%) in the diaper disposed state is 30. %, The tensile load at the effective elongation defined by the elongation ratio reduced by% (diaper arrangement state elongation ratio-30%) is 20 to 120 gf, preferably 50 gf to 100 gf, and the elongation ratio is from 20% to the effective elongation ratio. The tensile load increase rate during the period is 1.0 (gf /%) or less, preferably 0.7 (gf /%) or less.
The meaning of evaluating the effective elongation rate, that is, the point of 30% less than the elongation rate (%) of the diaper arrangement state is that when measuring the load curve of the three-dimensional gather with respect to the elongation rate (%), ie, the elongation stress, This is because the extension rate often includes the extension load of the constituent members, tends to be a load curve that is greater than the physical property value as a gather, and is not a net gather physical property.
Also, when the diaper is mounted, the diaper bends in a U shape, and the three-dimensional gathers arranged in the diaper become a U-shaped track that is smaller than the outer periphery of the diaper. Since there is almost no expansion, it can be said that evaluation at a point subtracted from the expansion rate of the diaper-arranged state is a reasonable point to express the behavior of the three-dimensional gathering in a substantial wearing state.
[0023]
[Extension characteristics when diapers are not fixed]
The tensile load at the effective elongation rate and the tensile load increase rate are obtained as follows.
From the diaper 1, a three-dimensional gather (a strip-shaped portion between the fixed end and the free end) 6 is cut out to make a test piece, and the test piece is taken from Tensilon Tensile Tester [Orientec Co., Ltd., RTC-1150A]. It is fixed between the chucks and stretched in the longitudinal direction under conditions of a speed of 300 mm / min and a load cell of 5 kg, and the stretching rate and the corresponding tensile load in the stretching process are plotted. Elongation percentage (%), vertical axis; tensile load (gf), see FIG. 5].
[0024]
From the obtained relationship curve, the value of each tensile load when the elongation rate is 20% and the effective elongation rate is read. Also, the slope of the relationship curve from 20% to the effective elongation rate, that is, [tensile load (at effective elongation rate) −tensile load (at 20%)] / [effective elongation rate (%) − 20%] The calculated value is taken as the tensile load increase rate (gf /%) between the stretch rate of 20% and the effective stretch rate.
Note that the test piece is cut out so as to include a portion located in the center part of the diaper longitudinal direction, and is in a natural state, that is, on a plate having a flat surface in a state where the cut-out gather is naturally contracted. Then, the cut is cut out so that the length when the gathers are flattened without applying a load as much as possible is at least 70 mm or more. Preferably, the one after measuring the stretch rate in the diaper arrangement state is used. The initial length of the test piece at the start of stretching (length in a natural state, stretching rate 0%) is 50 mm, and the test strip is stretched until reaching the stretching rate in a state where it is arranged in a diaper.
[0025]
When the tensile load at the effective stretch rate is less than 20 gf, the standing property of the tip portion of the three-dimensional gather is impaired at the time of wearing, and when the leading end of the three-dimensional gather is guided to the crotch portion at the time of wearing in the standing position, etc. May fall or bend against the wearer's skin, making it difficult to wear correctly. In addition, when the posture of the wearer changes, there is a high possibility that a gap is generated between the tip of the three-dimensional gather and the wearer's skin and the excrement is leaked. Even if the tip of the three-dimensional gather is in contact with the wearer's skin without a gap, the concealing force to confine excrement within the three-dimensional gather is weak because the tightening force as a three-dimensional gather is weak, The possibility that excrement moves outward by pushing the gather tip is increased, and it cannot be said that it is effective as a leakage prevention effect.
If the tensile load at the effective stretch rate is more than 120 gf, the diaper will have a large force when it is unfolded, and the diaper will be difficult to unfold. In addition, the handling of the diaper after mounting is also poor because the diaper has a strong force to curl.
[0026]
In addition, when the diaper is inserted into the crotch part, the diaper is curled or slipped off without being attached to the tape part when the diaper is inserted into the crotch part, which makes it difficult to install.
These are problems that occur when the expansion rate when the diaper is arranged as in the present invention, and the phenomenon that the three-dimensional gather stretched at the time of deployment tries to shrink so as to release the expansion, and the diaper is rounded as a result. It is. Therefore, in the present invention, by reducing the tensile stress to some extent, the force for the behavior to be shrunk is reduced, the phenomenon to be shrunk is delayed, or the force required for developing the shrunk is reduced. Thus, it was achieved that the wearability of the wearer was not deteriorated. In particular, the elongation stress is a dominant factor under the condition of the same elongation rate when the diaper is arranged, and the smaller the elongation stress is, the easier it is to stretch and the easier to handle the diaper. If it does not exceed 120 gf, it can be said that the wearer can easily deploy the diaper and the operability is not impaired.
[0027]
  The rate of increase in tensile load is preferably small, and the gathered diaper's three-dimensional gathers are in close contact with the skin, and the force to prevent leakage does not change greatly due to changes in the posture of the wearer and various wearing methods. In addition, there is no sudden force change when unfolding the diaper even when worn, and there is no gathered weight (so-called weight) felt by the wearer during unfolding, making it easy to handle and wearing both sleeping and standing Can be improved.
  Therefore, when the tensile load increase rate is calculated as the increase amount of the tensile load per unit increase amount of the elongation rate, the tensile load increase rate is 1 at all points from the elongation rate exceeding 0% to the effective elongation rate. 0.0 (gf /%) or less is preferable. However, in some sections, it may exceed 1.0 (gf /%). When such a section is a portion having an expansion rate of about 0 to 20%, what substantially has the above-described effect does not depart from the gist of the present invention. Nevertheless, the upper limit of the tensile load increase rate in this section is preferably up to 2.0 (gf /%).
  From this point of view, in the present invention, the tensile load increase rate is defined between the stretch rate of 20% and the effective stretch rate..
[0028]
The three-dimensional gather of the present invention has a tensile load increase rate of 1.0 (gf /%) or less at least from an elongation rate of 20% to an effective elongation rate as a whole, and tensile members at an effective elongation rate. A load having a load of 20 to 120 gf can be obtained by a method of bonding and fixing to a nonwoven fabric sheet. Here, “all” means “as a total of a plurality” when a plurality of elastic members are arranged in a three-dimensional gather. As elastic members for three-dimensional gathers, thread-like ones (thread rubber, etc., preferably with a thickness of 450 dtex or less), belt-like ones with a predetermined width (flat rubber, etc., one with a thickness to thickness ratio of 0.1 to 1 In addition to natural rubber, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, urethane, and the like can be used as the material for forming the elastic member. be able to. When a plurality of elastic members are arranged in a three-dimensional gather, the tensile load increase rate from at least 20% elongation rate to the effective elongation rate in each elastic member is 0.5 (gf /%) or less, and the effective elongation rate. It is preferable to use one having a tensile load of 5 to 50 gf.
[0029]
According to the disposable diaper 1 of the present invention, the substantial width of the diaper crotch can be made relatively narrow, and the outermost part of the leg gathers is also narrowed. Therefore, when the diaper is mounted in a standing position, The diaper smoothly enters the narrow crotch part (space between both legs) of the wearer, and the leg gathers are easy to follow along the crotch. Moreover, since the space between the three-dimensional gathers is maintained by the low-modulus three-dimensional gathers arranged at a high elongation rate, and the space between the three-dimensional gathers is maintained, excrement is sufficiently retained between the three-dimensional gathers. At the same time, since the excrement is less likely to exceed the three-dimensional gather, excellent absorption performance and leakage prevention performance can be obtained.
[0030]
  The diaper of the present invention has a great feature in that leakage from the crotch part does not occur even if the width of the crotch part is narrower than that of the conventional diaper. In the first place, those skilled in the art do not consider narrowing the crotch part that is closest to the urination part, and the necessity of so-called diapers that are worn in the conventional sleeping position is slightly constricted only within a range that increases the wearing feeling during wearing. It was only an hourglass. On the other hand, the present inventors have found that neither the child nor the parent feels stress against the child in the middle growth state from the state in which he / she has turned over until he / she can walk on his / her own. As a diaper that can be used in the future, I recalled a completely new idea of a tape-stopping diaper that can be worn in a standing position. Based on this, as a result of studying to make standing installation easy and high leak prevention performance compatible, the width of the crotch part was narrowed daringly contrary to the common sense of those skilled in the art, the arrangement width of three-dimensional gathers and leg gathers, The present invention was achieved by arranging the height and a specific three-dimensional gather.
[0031]
Further, preferred embodiments of the present invention will be described.
The disposable diaper 1 of the present embodiment has a saturated absorption capacity on both sides of a center line CL (see FIG. 1) that bisects the diaper in the longitudinal direction, that is, saturated absorption of both portions F and G located on both sides of the center line CL. The capacity ratio (part F / part G) is 45/55 to 55/45, so that the first part B is positioned on the wearer's ventral side and the fastening tapes 5, 5 are on the wearer's back side. No urine leakage occurs even when the wearer wears the landing zone 51 by a wearing method (hereinafter also referred to as a backside wearing).
That is, the disposable diaper 1 according to the present embodiment has the first part B positioned on the back side of the wearer, and the fastening tapes 5 and 5 are fastened to the landing zone 51 on the wearer's belly side (hereinafter referred to as “the wearing zone”). Not only can it be mounted on the ventral side), but it can also be easily mounted on the back side, and no leakage occurs in either case. From the viewpoint of preventing leakage of urine regardless of the direction of wearing, the ratio of the saturated absorption capacity (part F / part G) is preferably 48/52 to 52/48, and saturated absorption of both parts. A capacity | capacitance is so preferable that the difference of both is small.
[0032]
Here, the saturated absorption capacity on both sides of the center line CL of the diaper is measured as follows.
[Measurement method of saturated absorption capacity]
First, the diaper 1 is cut | disconnected in the width direction by the centerline CL which bisects the longitudinal direction. Then, the three-dimensional gather and the leg gather are cut and removed. Furthermore, the expansion / contraction part distribute | arranged to the trunk part is cut | disconnected. However, care is taken so that the structure of the absorption layer is not broken or cut. A cut diaper is placed on a wire mesh that has been processed so that it can be removed horizontally from the container, and the weight of the wire mesh is measured. A diaper together with a wire mesh is put in a container provided with an opening for discharging the solution in the lower part of the side surface in advance, the excretion opening is closed, and 0.9% by weight of physiological saline is injected so that the absorber is completely immersed. At this time, the injection speed is adjusted so that the polymer or the like does not fall off from the cut end of the diaper. Leave for 30 minutes after complete immersion. Thereafter, the container is tilted 10 degrees with the discharge opening on the lower side, the discharge opening is opened, and the solution in the container is discharged. The container is left for 30 minutes until the discharge is completely completed, and then the diaper with the wire mesh is taken out from the container, and the weight of the wire mesh is measured. The absorption amount of the diaper is calculated from “weight after completion of the test” − “weight before the start of the test”, and this value is defined as a saturated absorption amount (g).
[0033]
The formation material of each part in the disposable diaper 1 of this embodiment is demonstrated.
As the forming material for the top sheet 2, the back sheet 3, the absorbent body 4, the sheet material 62 for forming a three-dimensional gather, the landing tape for forming the landing zone 51, and the like, various known materials conventionally used for disposable diapers are used. Can be used without particular limitation.
[0034]
The fastening tape 5 may have a fastening portion made of a male member of a mechanical hook-and-loop fastener, or may have an adhesive portion formed by applying an adhesive. Further, the outer surface side of the back sheet 3 can be formed of a material having a high engagement property and can be used as the landing zone 51.
[0035]
As the elastic member 61 for forming a three-dimensional gather, the leg elastic member 71, the waist elastic member 81, and the waist elastic member 91, various known elastic members can be used, for example, as the form of each elastic member , Thread-like ones (thread rubber, etc.), belt-like ones with a predetermined width (flat rubber, etc.), thin film-like ones, etc. The elastic member can be made of natural rubber, styrene-butadiene, Examples thereof include synthetic rubbers such as butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, and urethane.
[0036]
The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the waist part D in the above embodiment, a belt-like waist part elastic member 81 is disposed and a waist elastic part 8 is formed, but instead, as shown in FIG. The waist elastic part 8 can also be formed by disposing a plurality of thread-like elastic members 81 over both sides. In this case, the plurality of elastic members can be fixed to a flexible sheet material or the like and disposed as a composite elastic member. Further, in place of the waist elastic member 81 and the plurality of waistline elastic members 91 in the above embodiment, as shown in FIG. 4B, a wide band-like elastic member 92 having a width of 20 to 50 mm is used as a waist edge. It can also arrange | position so that it may cover the area | region between a pair of fastening tapes.
The disposable diaper according to the present invention is suitable for an infant (baby) disposable diaper, particularly an infant who dislikes changing diapers.
[0037]
【Example】
<Examples 1 and 2, Comparative Examples 1 and 2>
The disposable diaper of the form shown in FIG.1 and FIG.2 was manufactured.
Ratio (W1) between the distance W1 between the fixed ends of the pair of three-dimensional gathers and the distance W2 between the elastic members located on the outermost sides of the pair of leg gathers in the minimum width portion of the crotch part of the manufactured disposable diaper / W2), the distance W3 from the fixed end of each three-dimensional gather to the elastic member located on the outermost side of each leg gather, the height W4 and the minimum width of each three-dimensional gather, and the diaper arrangement for each three-dimensional gather Table 1 shows the stretch ratio in the installed state and the stretch characteristics in the diaper unfixed state.
For Examples 1 and 2, the ratio (W1 / W2) is 0.67 to 0.81 over a length of 50 mm or more in the diaper longitudinal direction, and a length of 50 mm or more in the diaper longitudinal direction. The distance W3 <the height W4.
FIG. 5 is a graph showing the relationship between the stretch rate of the three-dimensional gather and the tensile load (tensile force) in the diaper non-fixed state, and curve (1) is Examples 1, 2 and Comparative Example 2, and curve (2) is 6 is a curve showing the expansion / contraction characteristics of the three-dimensional gather used in Comparative Example 1.
[0038]
[Table 1]

[0039]
<Performance evaluation>
About the disposable diaper of an Example and a comparative example, the ease of standing mounting | wearing, the urine leak prevention performance, and the loose stool space retention property were evaluated with the following evaluation method and evaluation criteria, respectively. The results are shown in Table 2.
1) Ease of wearing in standing position (evaluation of ease of wearing)
The wearing method was a method in which an infant model was set up and the fastening tape of a paper diaper was fastened to the landing zone on the abdomen side of the wearer (abdomen side wearing), and the ease of wearing in a standing position was evaluated.
(Evaluation criteria)
In the case of wearing in the standing position, the case where it was able to be fitted properly in the navel position was marked with “◯”, and the case where it was necessary to be fixed under the navel after being misaligned was marked as “X”.
[0040]
2) Urine leakage prevention performance (dynamic crotch evaluation method)
Wearing a disposable diaper on the infant's waist model (a model that can walk and move both legs back and forth and inject artificial urine from the crotch and imitate the infant's waist) The dynamic crotch mole value was measured by the following method.
In the measurement of the crotch value, a disposable diaper was first attached to the above infant model (ventral position at the front end of the ventral side) and allowed to walk for 5 minutes at a walking speed of 150 steps / minute. Thereafter, the walking motion was stopped, 80 g of artificial urine was injected at a rate of 5 g / second through the tube, and the walking motion was further performed for 5 minutes. Thereafter, the model was laid down, 40 g of artificial urine was injected at a rate of 5 g / sec, and it was visually checked whether or not it had leaked when the 40 g injection was completed. For those that did not leak, an additional 40 g of artificial urine was injected, and such an operation was repeated until it leaked. The total amount of artificial urine injected at the time when urine leakage was observed was defined as the dynamic crotch mole value.
[0041]
3) Loose stool space retention (evaluation of loose stool mobility)
Infant posture change model by walking on the ventral side (walking in standing position, opening / closing of legs in sitting position, standing → posture changing movement in sitting position and artificial urine / artificial infusion from crotch part are possible. The model that imitates the waist of the diaper) was fitted with a diaper, and the stool movement performance was evaluated by the following method.
The measurement method was as follows. First, a disposable diaper was attached to the above infant model (the ventral tip of the diaper was adjusted to the position of the ridge), and the walking movement was performed for 5 minutes at a walking speed of 150 steps / minute (standing position). Thereafter, the walking motion was stopped, 80 g of artificial urine was injected at a rate of 5 g / second through the tube, and the walking motion was further performed for 5 minutes. Thereafter, 160 g of artificial stool was injected at a rate of 10 g / sec with the model sitting and the legs open, and the activity of walking / standing → changing the sitting position / opening / closing the leg in the sitting position was repeated for 5 minutes. . The state of stool movement was observed by opening and closing a disposable diaper.
(Evaluation criteria)
When the artificial B flight exceeded the three-dimensional gather, it was marked as “X”, and when it was not exceeded, it was marked as “◯”.
[0042]
[Table 2]

[0043]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the unfoldable disposable diaper which was excellent in the mounting property in the standing position, and was excellent in the absorption performance and the leak prevention performance can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view showing a state (tensed state) of a disposable diaper according to an embodiment of the present invention in which an elastic member of each part is expanded and expanded in a planar shape.
2 is a schematic cross-sectional view showing a cross section (a cross section taken along a center line CL in the hand direction) in a minimum width portion of the crotch part of the disposable diaper of FIG. 1;
FIG. 3 is a view showing a state where the disposable diaper of FIG. 1 is mounted on an upright infant in a standing position.
4 (a) and 4 (b) are plan views showing a main part of a disposable diaper according to another embodiment of the present invention.
FIG. 5 is a graph showing a relationship between a stretch rate of a three-dimensional gather and a tensile load (tensile force) in a diaper non-fixed state.
[Explanation of symbols]
1 disposable diapers
2 Top sheet
3 Back sheet
4 Absorber
5 Fastening tape
6 Solid gathers
61 Three-dimensional gathered elastic member
7 Leg gathers
71 Leg elastic member

Claims (3)

In a diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent interposed between both sheets,
Diapers for infants that can stand or yes yes ,
A pair of fastening tapes are provided on both side edges of one part in the longitudinal direction,
A pair of three-dimensional gathers and a pair of leg gathers are formed by disposing elastic members on both sides in the longitudinal direction,
The minimum width value of the crotch part of the diaper is 100 to 240 mm,
A ratio (W1 / W2) between a distance W1 between the fixed ends of the pair of three-dimensional gathers and a distance W2 between the elastic members located on the outermost sides of the pair of leg gathers in the minimum width portion of the crotch part Is 0.67 to 0.81, and the distance W3 from the fixed end of each solid gather to the elastic member located on the outermost side of each leg gather is shorter than the height W4 of each solid gather ,
The three-dimensional gather is arranged with an elongation ratio of 100% or more, and when the three-dimensional gather is stretched in a diaper non-fixed state, it is defined as an elongation ratio obtained by subtracting 30% from the stretch ratio (%) in the diaper arranged state. Installation in a standing position where the tensile load at the effective elongation rate is 20 to 120 gf, and the tensile load increase rate between 20% and the effective elongation rate is 1.0 (gf /%) or less. Easy to use diapers for infants. The diaper for infants that can be easily mounted in a standing position according to claim 1, wherein the ratio (W1 / W2) is within a range of 0.67 to 0.81 over a length of 50 mm or more in the longitudinal direction of the diaper .   The infant diaper that can be easily mounted in a standing position according to claim 1 or 2, wherein the distance W3 is shorter than the height W4 over a length of 50 mm or more in the longitudinal direction of the diaper.

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