JP4870825B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable paper diaper such as a pants-type.

  This type of paper diaper has a waist opening and a pair of left and right leg openings formed by joining both side edges of the front and back bodies of the outer sheet, and a liquid-permeable top sheet and a liquid-impermeable back sheet The absorbent main body having an absorbent core sandwiched between the front body and the back body is attached in the vertical direction at the center in the product width direction, and is widely used.

  In particular, in a pants-type disposable diaper, each of the stomach side and the back side has a large number of elastic members along the circumferential direction in the waist region from the waist opening edge to the leg opening start end and having a longitudinal interval. ing. The waistline region can be conceptually divided into a waist part and a lower waist part, and a large number of elastic members are attached to each. These waist stretchable members and lower waist stretchable members contribute to prevention of product slipping, and in particular, the latter has a function of improving the adhesion of the product to the skin.

  There is also a so-called tape-type paper diaper that joins the left and right sides of the abdomen and the left and right sides of the back when using the diaper. It has become.

  By the way, in these conventional paper diapers, the leg opening edge in the crotch region forming the leg opening is the remaining part of the cutting allowance or the absorption main body attaching allowance in the manufacturing process (hereinafter also referred to as the surplus part), and the elastic member Was not attached, and was formed only from the material (usually non-woven fabric) of the outer sheet.

  However, the conventional product has a problem that the leg opening edge, which is an excessive part, is wavy and flickering, and has an unpleasant appearance such as giving an unnecessary volume feeling around the legs.

  On the other hand, it can be considered that this problem can be dealt with by cutting the leg opening so that the surplus portion is eliminated. However, such a surplus part may not be necessary in the product state, but is necessary as a cutting allowance or an absorption main body attaching allowance in the manufacturing process, and it is not preferable in manufacturing to eliminate such a surplus part.

  Accordingly, a main object of the present invention is to provide a disposable diaper that has a leg opening edge that is not easily fluttered and that has a clean leg periphery and a good appearance.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A pants-type disposable diaper having an outer core and an absorbent core extending in the longitudinal direction around the crotch part on the inner surface of the outer sheet, and having a waist opening and left and right leg openings,
The pants-type paper diaper consists of a waist area and a crotch area composed of a waist part and a lower waist part,
In the waist portion, a plurality of thread-like or narrow belt-like waist elastic members are provided in parallel in the circumferential direction with a certain interval in the longitudinal direction,
In the lower waist portion, a waist elastic member having a plurality of thicknesses of 620 dtex or less smaller than the stretching stress and the cross-sectional outer diameter of the waist elastic member extends over the longitudinal direction range of 60% or more of the lower waist region. Provided in parallel to the circumferential direction with an interval of 7 mm or less shorter than the interval of the members,
In the front body of the crotch region, a plurality of shaped elastic members having a thickness smaller than the outer diameter of the waist elastic member and a cross-sectional outer diameter of 620 dtex or less have an interval of 7 mm or less, which is shorter than the interval of the waist elastic member. Provided parallel to the circumferential direction,
The lower waist elastic member and the shaping elastic member are a distance between the lower waist elastic member provided at the lowermost part of the lower waist and the shaping elastic member provided at the uppermost part of the front body of the crotch region. Is a pants-type disposable diaper characterized by having a distance of 7 mm or less shorter than the distance between the waist elastic members and continuously provided in the vertical direction.

<Effect>
According to a first aspect of the present invention, the lower waist has a plurality of thicknesses of 620 dtex or less smaller than the stretching stress of the waist elastic member and the cross-sectional outer diameter over the longitudinal range of 60% or more of the lower waist region. An elastic member is provided in parallel to the circumferential direction with an interval of 7 mm or less which is shorter than the interval of the waist elastic member, and is smaller in the front body of the crotch region than the tensile stress and the cross-sectional outer diameter of the waist elastic member. Since the plurality of shaping elastic members having a thickness of 620 dtex or less are provided in parallel in the circumferential direction with an interval of 7 mm or less, which is shorter than the interval of the waist elastic member, from the lower waist to the front body of the crotch region The generated heels are narrow in the waist circumference direction, short in the crotch direction, and generated in a form in which the heels are substantially continuous in the crotch direction, and the recesses or protrusions of each heel are very small. As a result, even if the cocoon is inconspicuous and visible, it is a fine cocoon, and it has a flat outer surface as a whole. .
Further, the lower waist elastic member and the shaping elastic member are the lower waist elastic member provided at the lowermost part of the lower waist and the shaping elastic member provided at the uppermost part of the front body of the crotch region. The gap of the leg is 7 mm or less shorter than the interval of the waist elastic member, and is provided continuously in the vertical direction. Therefore, the leg opening edge is formed by the shaping elastic member particularly in the front body of the crotch region. While shrinking in parallel with the waistline and becoming smaller, a large number of gavel along the longitudinal direction (direction perpendicular to the shrinking direction) is formed in parallel in the shrinking direction, and this longitudinal gavel increases the rigidity of the leg opening edge. And, by these synergistic actions, the leg opening edge does not flutter like a conventional product, and the leg periphery is clean and the appearance is good.

<Invention of Claim 2>
A pair of left and right leg elastic members extend along the leg opening in the crotch region, and the shaping elastic member intersects with the leg elastic member in the vicinity of the leg opening. The underpants type paper diaper according to 1.

<Effect>
According to a second aspect of the present invention, in the crotch region, a pair of left and right leg elastic members extend along the leg opening, and the shaping elastic member is located in the vicinity of the leg opening. Because it intersects with the surrounding elastic members, the outer edge of the shaping elastic member is less likely to be pulled inward, and the entire crotch region is pulled up toward the side of the waist, improving the fit of the entire crotch region to the skin. Can do.

<Invention of Claim 3>
The underpants type disposable diaper according to claim 1 or 2, wherein the lower waist elastic member and the waist elastic member are discontinuously provided at a central portion of the absorbent core.

<Effect>
In the invention according to claim 3, since the lower waist elastic member and the shaping elastic member are discontinuous at the central portion of the absorbent core, the disposable diaper extends from the lower waist to the front body of the crotch region as a skin. Is pressed against the skin, there is no local excessive pressure on the skin, the inner surface of the product and the skin are in close contact with each other, the fit is good, and the slippage of the paper diaper can be prevented.

<Invention of Claim 4>
The lower waist elastic member is provided from the left and right joints of the waistline region to corresponding positions on both sides of the absorbent core, and the lower waist elastic member extends and contracts between the joint and the corresponding position. The underpants type paper diaper of any one of claim | item 1-3.

<Effect>
According to a fourth aspect of the present invention, the lower waist elastic member is provided from the left and right joints of the waist region to corresponding positions on both sides of the absorbent core, and the lower waist elastic member corresponds to the joint. Since it expands and contracts between the positions, in the lower waist region, the absorbent body is less likely to lift from the skin, and leakage from the waist circumference portion is even less likely to occur.
In addition, since the absorbent core has higher rigidity than the outer sheet (it is difficult to bend and shrink), the lower waist is contracted toward the absorbent core at the center in the width direction along the direction parallel to the waist, and the lower waist is more It is cleaner and looks better.

<Invention of Claim 5>
The said shaping expansion-contraction member is each provided from the left and right leg opening edge part to the corresponding position of the both sides of an absorption core, and the said shaping expansion-contraction member expands-contracts between the said leg opening edge part and the said corresponding position. The underpants type paper diaper of any one of -4.

<Effect>
According to a fifth aspect of the present invention, the shaping expansion / contraction member is provided from left and right leg opening edges to corresponding positions on both sides of the absorbent core, and the shaping expansion / contraction member includes the leg opening edge and the corresponding position. Therefore, in the crotch region, the absorbent body is less likely to lift from the skin, and leakage from the waist area is less likely to occur.
In addition, since the absorbent core has higher rigidity than the outer sheet (it is difficult to bend and shrink), the crotch is contracted toward the absorbent core at the center in the width direction along the direction parallel to the waist, and the lower waist is more It is cleaner and looks better.

<Invention of Claim 6>
The underpants type disposable diaper according to any one of claims 1 to 5, wherein an interval between the lower waist elastic members and an interval between the shaping elastic members are the same interval.

<Effect>
In the invention according to claim 6, since the gap between the lower waist elastic members and the gap between the shaping elastic members are the same, the generated heel extends from the lower waist to the front body of the crotch region. The disposable diaper has a narrower width, the same length in the crotch direction, and the outer surface of the product does not “mocomoko”, and has a better appearance.

<Invention of Claim 7>
The underpants type disposable diaper according to any one of claims 1 to 6, wherein the shaping elastic member is provided over a longitudinal range of 60% or more of the front body of the crotch region.

<Effect>
In the invention according to claim 7, since the shaping stretchable member is provided over a longitudinal range of 60% or more of the front body of the crotch region, the outer surface of the product does not “boil” and looks better Excellent disposable diaper.

  As described above, according to the present invention, it is possible to obtain a pant-type disposable diaper that suppresses lifting from the skin of the absorbent body and hardly leaks, suppresses flutter at the edge of the leg opening, and has a clean appearance around the legs.

It is a top view from the deployment state use surface side of a 1st embodiment of a underpants type diaper for term explanation of the present invention. It is a top view from the deployment state use surface side of a 1st embodiment of a pants type diaper. FIG. 5 is a view taken along line 5-5 in FIG. 2. It is a use state perspective view. It is a principal part perspective view of 1st Embodiment of a pants-type diaper. FIG. It is a top view from the deployment state use surface side of a 2nd embodiment of a underpants type diaper. It is a principal part perspective view of 2nd Embodiment of a pants-type diaper. It is a top view from the deployment state use surface side of a 3rd embodiment of a underpants type diaper. It is a principal part perspective view of 3rd Embodiment of a pants-type diaper. It is a top view from the deployment state use surface side of a 4th embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of a 5th embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of a 6th embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of a 7th embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of an 8th embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of a ninth embodiment of a pants type diaper. It is a top view from the deployment state use surface side of a 10th embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of an eleventh embodiment of a underpants type diaper. It is a top view from the deployment state use surface side of the 12th embodiment of a underpants type diaper. It is a figure which shows the example of a design of a product front and back. It is a top view from the expansion | deployment state use surface side of 1st Embodiment of a tape-type paper diaper. It is a longitudinal cross-sectional view in the crotch center part of 1st Embodiment of a tape-type paper diaper. It is a top view from the unfolding state use surface side of 2nd Embodiment of a tape-type paper diaper. It is a longitudinal cross-sectional view in the crotch center part of 2nd Embodiment of a tape-type paper diaper. It is a top view from the expansion | deployment state use surface side of embodiment provided with another expansion-contraction member. It is a top view from the expansion | deployment state use surface side of embodiment provided with the other expansion-contraction member.

  Hereinafter, the embodiment of the present invention will be described in detail by first taking an example of a pants-type disposable diaper, and then, when using the diaper (when worn), the left and right side edges on the back side are brought into the left and right side edges on the abdomen side. An application example to a so-called tape type paper diaper of a type in which these are joined by a tape fastener (including an adhesive tape fastener and a hook-and-loop fastener) will also be described.

<"Explanation of terms of the present invention" and a first embodiment of a pants-type disposable diaper>
The pants-type disposable diaper according to the first embodiment will be described with reference to FIG. 2 to FIG. 6 while the terms related to the site and direction of the present invention will be mainly described with reference to FIG.
As shown in FIGS. 2 and 3, the pants-type disposable diaper according to the first embodiment is fixed to the flexible outer sheet 1 and the inner surface of the outer sheet 1, and has a crotch (inseam, folded portion) 4. The main component is an absorption main body 10 extending in the vertical direction (front-rear direction).

  The outer sheet 1 is formed by laminating and fixing two or three or more breathable / water-repellent nonwoven fabrics. At the final stage of the manufacturing process after the outer sheet 1 and the absorbent main body 10 are superposed, By joining the entire longitudinal direction of both side edges with the back body B by means such as ultrasonic sealing or heat melting (this joint is denoted by reference numeral 30), a waist opening as shown in FIG. WO and a pair of left and right leg openings LO are formed.

  In the code | symbol of FIG. 1, "vertical direction" means the direction which connects an abdominal side and a back side, and "circumferential direction" means the direction (or product width direction) orthogonal to the said vertical direction. “Waist opening edge” means the edge of the waist opening WO, and “Leg opening edge” means the edge of the leg opening LO. The “leg opening start end” means a position where the leg opening edge of the leg opening LO intersects with the joint portion 30, and means a starting position of the leg opening edge. “Torso circumference area” T means the entire area of the length range from the waist opening edge to the leg opening start edge. The waistline region T can be conceptually divided into a “waist portion” W and a “lower waist” U. Although the length of these vertical directions changes with sizes of a product, the waist part W is 15-40 mm and the waist lower part U is 45-120 mm. “Crotch region” L means the entire region of a length range from the leg opening start end on the front body side to the leg opening start end on the back body side, which forms the leg opening. Further, the “center portion” means an intermediate region excluding the side portion including the center line of the product. The “side portions” mean both side portions in the waistline region T.

  As shown in FIG. 3, the absorbent main body 10 is mainly composed of a rectangular liquid-permeable top sheet 11 made of a nonwoven fabric or the like that directly touches the wearer's skin and cotton-like pulp, and has a certain degree of rigidity (semi-rigid). ) Absorber AB composed of a rectangular absorbent core 13 and a rectangular crepe paper 14 wrapped around the upper and lower surfaces thereof, and a rectangle composed of a polyethylene plastic film etc. reaching the vicinity of both side edges on the back surface of the absorber AB. The liquid-permeable top sheet 11 wraps around the side edges of the absorber AB and reaches the back surface, and is superimposed on the liquid-impermeable back sheet 12. These elements are integrated by bonding with a hot-melt adhesive (indicated by * in the figure is the bonding portion). If necessary, a liquid-permeable second sheet 11S can be interposed between the liquid-permeable top sheet 11 and the crepe paper 14 as illustrated. The absorbent main body 10 is integrated by adhering almost the entire back surface to the outer sheet 1 with a hot melt adhesive.

  Standing cuffs C and C around the legs projecting to the use surface side are formed on both sides of the absorbent main body 10, respectively. The standing cuffs C include a standing sheet 40 that is substantially continuous in the width direction, an elastic member, for example, It is composed of one elastic rubber member 50, 50 ... as shown in the figure.

  In more detail, the standing cuff C is formed by doubling the standing sheet 40 and wrapping each of the elastic members 50, 50... With a hot melt adhesive or the like. The standing sheet 40 forming each standing cuff C, C is preferably not liquid-permeable but liquid-permeable or hydrophobic. For this reason, it is good also as a structure which sticks another sheet | seat (a film, a nonwoven fabric, etc.) on the inner surface of the standing sheet 40, and improves leak-proof property. Moreover, you may make it become a property which repels a liquid by a silicon process etc. with respect to liquid-permeable sheets, such as a nonwoven fabric. Furthermore, it is desirable to have air permeability or vapor permeability.

  The inner surfaces of the double upright sheets 40 go around the back surfaces of the absorber AB and the liquid-impermeable back sheet 12 and are fixed by a hot melt adhesive or the like. As a result, the fixed start end of the double upright sheet 40 forms the upright end of the upright cuff C.

  The tip side from the standing end is a free part that is not fixed to the product body.

  On the other hand, at the front and rear end portions in the longitudinal direction, the free portion is fixed to the article, specifically to the outer surface of the liquid-permeable top sheet 11, with the tip thereof toward the center side of the article by hot melt adhesive or the like. Yes.

  Further, the basic configuration is that at least one of the elastic members 50, 50... Is in the free part, but in particular, the elastic member 50 is preferably at the tip of the free part, and is further shown in FIG. As shown, it is preferable to have the elastic member 50 also on the base side. It is further desirable to have a plurality of tip portions as shown in the figure.

  FIG. 2 shows a state in which the paper diaper is expanded in the longitudinal direction. At the time of wearing, the paper diaper is attached to the body in a boat shape, and the contraction force of each of the elastic members 50, 50. The standing cuff C is erected by the contraction force of each of the elastic members 50, 50. At this time, the side portion of the absorbent main body 10 is deformed and lifted, and the absorbent core 13 is also slightly lifted while being deformed to form a deep pocket space.

  The space surrounded by the left and right standing cuffs C, C forms a urine or soft stool confinement space. When urinating into this space, the urine is absorbed into the absorbent body AB through the liquid-permeable top sheet 11, and the rising cuff C becomes a barrier for the solid matter of loose stool, and the overpass is prevented. The

  On the other hand, at the longitudinal ends of the front body F and the back body B, between the nonwoven fabrics of the outer sheet 1 in the waist W, the gap is parallel to the edge of the waist opening WO in order to enhance the fit around the waist. The waist elastic members 20F and 20B made of thin thread rubber are placed and fixed under extension so that they extend. The interval and the number of the waist elastic members 20F and 20B in the waist part W can be determined as appropriate. For example, the interval is preferably about 2 to 8 mm, and the number is preferably about 4 to 10 pieces. Moreover, as the waist elastic members 20F and 20B, it is preferable to use thin elastic rubber, specifically, an elastic member having a thickness of 620 dtex or less.

  Furthermore, in this embodiment, in the lower waist U which is a region between the waist part W and the crotch region L of the front body F and the back body B, the lower abdomen of the front body F and the buttocks of the back body B are arranged in the circumferential direction. A lower waist elastic member 21F, 21B is provided along. In this example, the lower waist elastic member 21F of the front body F is provided on the left and right sides of the product excluding almost the entire absorbent core 13 in the portion from the joint portion 30 on one side to the joint portion 30 on the other side. The lower back elastic member 21B of the back body B is continuously provided from the joint 30 on one side to the joint 30 on the other side.

  Preferably, as these lower waist elastic members 21F and 21B, thin elastic rubber, specifically, an elastic member having a thickness of 620 dtex or less is used. In both the front body F and the back body B, the vertical spacing is used. Is set to 7.0 mm or less, and 15 to 40 are arranged and fixed between the nonwoven fabrics of the outer sheet 1 in parallel. The mutual interval between the lower waist elastic members 21F and 21B is preferably the same as or shorter than the interval between the waist elastic members 20F and 20B.

  Further, the rubber thread used as the lower waist elastic members 21F and 21B has a tensile stress and a cross-sectional outer diameter smaller than or substantially the same as the thin rubber rubber used as the waist elastic members 20F and 20B. It can be. As the thin rubber thread used here, specifically, one having a tensile stress in the range of 4 to 17 g, particularly in the range of 5 to 10 g at 150% elongation is preferably used.

  Under such a configuration, according to the present invention, at least the leg opening edges 6 and 6 in the crotch region L are provided with the shaping expansion / contraction members 23F and 23B for contracting the leg opening edges 6 and 6 toward the center in the width direction in the vertical direction. Many are provided at intervals. More specifically, in this embodiment, for the front body F of the crotch region L, the shaping elastic member 23F is provided continuously from both leg opening edges 6 and 6 to the position corresponding to the absorbent core. It is not provided in the central part of the core 13. For the back body B, a shaping expansion / contraction member 23B is continuously provided from one leg opening edge 6 to the other. In particular, in this example, these shaping elastic members 23F and 23B have a length range R of 2 to 3 cm (4 to 6 cm in total) before and after the crotch portion 4 in the crotch region L, particularly 4 to 6 cm (8 to 12 cm in total). It is provided except.

  As for the shaping elastic members 23F and 23B, similarly to the lower waist elastic members 21F and 21B, it is desirable that the elastic members having a thickness of 620 dtex or less be arranged and fixed between the nonwoven fabrics with a vertical interval of 7.0 mm or less.

  In the paper diaper of the present invention thus formed, as shown in FIG. 5, the leg opening edges 6 and 6 are shrunk in parallel with the waist by the shaping elastic members 23F and 23B, and the longitudinal direction (perpendicular to the shrinking direction). A large number of gavel along the shrinking direction are formed in parallel, and the vertical gavel increases the rigidity of the leg opening edges 6 and 6. And, by these synergistic actions, the leg opening edges 6 and 6 do not undulate like the conventional product, and the leg periphery is clean and the appearance is good. Furthermore, this action effect also improves the adhesion to the pants worn from above the diaper, and also improves the appearance of the pants when they are worn in layers.

  In particular, in the case of this example, in addition to this function and effect, the shaped elastic members 23F and 23F in the front body F are discontinuous at the portion corresponding to the absorbent core 13, so The applied shrinkage force in the width direction is weakened, and the absorbent body is less likely to lift from the skin due to the vertical rod formed along the waist tightening direction by the action of the elastic member crossing the absorbent core 13, and leakage from the waist area occurs. It has the effect of being difficult. On the other hand, in the back body B, since the shaping expansion / contraction member 23B is continuously formed from the leg opening edge on one side to that on the other side, the adhesion to the skin of the part becomes high, and the slip-off preventing effect Will improve.

  Here, regarding the waist elastic members 20F and 20B, the lower waist elastic members 21F and 21B, and the shaping elastic members 23F and 23B, schematically shown as (a) in FIG. 6 outside the thickness range or the vertical interval range. As described above, wrinkles generated with the contraction of the thread rubber G are generated in a form extending from one to the other of the adjacent rubber threads G, and the uneven wrinkles are generated in a repetitive state in the circumferential direction of the trunk. Further, the wrinkles between adjacent thread rubbers G and the wrinkles between adjacent ones of the thread rubbers G are generated in an independent tendency without being continuous. These ridges have longer ridges or valleys corresponding to the separation distance as the arrangement interval between the rubber threads G is larger, and the pitch of the unevenness in the trunk periphery direction is larger. Therefore, since a large wrinkle is randomly generated as a whole on the outer surface of the product, the outer surface of the product becomes “momokomoko”, giving a feeling far away from the pant garment. Furthermore, since each thread rubber G is thick and has a large contraction force, for example, when one ridge is taken as an example, the valley on the thread rubber G side of the mountain becomes deep, and the existence of the thread rubber G is clear. Become. In addition, since the peaks or valleys are large and the contraction force acts strongly, complex gavel is randomly generated in the peaks or valleys. Furthermore, since the presence of the thick rubber thread G is clear, the consumer has a fear that the wearer's skin will be strongly tightened by the thick rubber thread G, and the consumer's willingness is reduced. In fact, it has been found that in the side portions where the absorbent core does not exist, the contraction force of the thick rubber thread G acts strongly, and that portion may remain as rubber marks on the skin. In addition, the sliding of the product is prevented mainly by the friction between the inner surface of the product and the skin at the part where each thread rubber hits the skin, but since the number of thread rubber per unit area is small, the product must have a very large shrinkage force. There is a risk of slipping off.

  On the other hand, within the above range, as schematically shown as (b) in FIG. 6, the generated heel is narrow in the waist direction, short in the inseam direction, and the heel is almost inseam. Generate in a continuous form in the direction. And the concave or convex of each ridge is very small. Moreover, there is almost no constriction at the thread rubber g portion, and it is difficult to determine the presence of the thread rubber g when the color of the sheet constituting the outer surface and the color of the thread rubber g are the same color. As a result, even if it is not visible and visible, it is fine with fine grain, and it has a flat outer surface as a whole. Become. And by making it press against the skin as a surface, there is no generation of rubber marks because there is no local excessive pressure on the skin, and the friction between the inner surface of the product and the skin reaches the whole, The close contact provides good fit and prevents the product from falling off.

  In order to exert this effect, 60% or more, desirably 70% or more, more preferably 90% or more of the expansion / contraction member in the region where each expansion / contraction member is disposed has a thickness and interval within the above range. It is sufficient if it is present, and it is not necessary to have the thickness or interval of the above range in a maximum 40% range.

<Second embodiment of a pants-type disposable diaper>
The shaping elastic members 23F and 23B of the first embodiment are usually fixed to the outer sheet 1 with an adhesive such as a hot melt adhesive. In that case, the outer end portions of the shaping elastic members 23F and 23B are used. May be drawn toward the center.

  Therefore, in the second embodiment, as shown in FIGS. 7 and 8, the outer ends of the shaping elastic members 23F and 23B are fixed to the outer sheet 1 by heat seals HS, HS. By the heat seals HS, HS..., The outer end portions of the shaping elastic members 23F and 23B are firmly fixed to the outer sheet 1 and are difficult to be pulled in.

<Third embodiment of a pants-type disposable diaper>
In the third embodiment, as shown in FIGS. 9 and 10, the shaping elastic members 23 </ b> F and 23 </ b> B extend to the joint 30 (upper part of the leg opening starting end) along the corresponding leg opening of each body. It is the form made to do. This extended portion is indicated by the symbol EG. Also in this case, the shaping expansion / contraction members 23F and 23B are provided except for a length range R of 2 to 3 cm, particularly 4 to 6 cm, before and after the crotch portion 4 in the crotch region L.

  According to the present embodiment, as in the first embodiment, not only the leg opening edges 6 and 6 are contracted by the portions parallel to the circumference of the shaping elastic members 23F and 23B, but also the extended portions EG, The entire crotch region including the leg opening edges 6 and 6 can be pulled up toward the joint portion 30 side, that is, the waist side by EG, and the fit of the entire crotch region to the skin can be improved.

<Fourth embodiment of a pants-type disposable diaper>
As shown in FIG. 11, in the fourth embodiment, contrary to the first embodiment, the shaping elastic member 23F in the front body F is continuously provided from the leg opening edge 6 on one side to that on the other side. The shaping elastic member 23B in the back body is continuously provided from both leg opening edges 6 and 6 to a position corresponding to the absorbent core 13, and is not provided in the central portion of the absorbent core 13. is there. In the illustrated example, the waist elastic members 21F and 21B are continuous and discontinuous with the shaping elastic members 23F and 23B, as opposed to the first embodiment.

<Fifth embodiment of a pants-type disposable diaper>
In the fifth embodiment, as shown in FIG. 12, the shaping expansion / contraction member 23F of the front body F and the shaping expansion / contraction member 23B of the back body B correspond to the absorbent core 13 from both leg opening edges 6, 6. Are provided continuously, and are not provided in the central portion of the absorbent core 13. In the illustrated example, both of the waist elastic members 20F and 20B and the lower waist elastic members 21F and 21B are provided with discontinuous portions in the center, respectively, in accordance with the shaping elastic members 23F and 23B.

<Sixth embodiment of a pants-type disposable diaper>
In the sixth embodiment, as shown in FIG. 13, the shaping expansion / contraction member 23F of the front body F and the shaping expansion / contraction member 23B of the back body B are continuous from the leg opening edge 6 on one side to that on the other side. It is the form provided in. In the illustrated example, both the waist elastic members 20F and 20B and the lower waist elastic members 21F and 21B are connected to the shaping elastic members 23F and 23B from the one-side joint portion to the other-side joint portion of the waistline region T. It is continuous.

<Seventh embodiment of a pants-type disposable diaper>
The shaping elastic member in the present invention is, for example, shown in FIG. 14 as an example of the shaping elastic member 23F of the front body F, from the leg opening edge in the crotch region L to the position near the absorbent core, preferably from the absorbent core 13 in the width direction. It is also possible to extend only up to 5 mm, particularly 2 mm apart. In the illustrated example, this distance is indicated by the symbol z. This configuration can be applied regardless of whether it is the shaping elastic member 23F of the front body or the shaping elastic member 23B of the rear body B.

<Eighth embodiment of a pants-type disposable diaper>
Moreover, the shaping expansion-contraction member in this invention can also be provided only in the leg opening edges 6 and 6 in the crotch area | region L, as the example of the shaping expansion / contraction member 23F of the front body F is shown in FIG. This configuration can also be applied regardless of whether it is the shaping expansion / contraction member 23F of the back body B and the shaping expansion / contraction member 23F of the front body.

<Ninth embodiment of a pants-type disposable diaper>
Further, in the above example, the shaping expansion / contraction members 23F and 23B are not provided in the length range R (see FIG. 9) of 2 to 3 cm, particularly 4 to 6 cm, respectively, before and after the crotch portion 4, but the shaping expansion / contraction members 23F, 23B can also be provided in the entire longitudinal direction of the crotch region L.

  An example of this configuration is shown in FIG. In the ninth embodiment, the outer shape sheet 1 is constituted by a width direction center sheet 1A and side sheets 1B and 1B on both sides, and each side sheet 1B and 1B has a mesh shape, for example, a lattice shape, between nonwoven fabrics. In this example, a rubber thread is fixed to the thread. The side sheets 1B and 1B on both sides are joined to the center sheet 1A in the width direction, and the side sheets 1B and 1B are expanded and contracted in the width direction and the front-rear direction. The rubber thread in the width direction in this case forms not only the elastic members of the waist part W and the lower waist part U but also the shaping elastic member of the present invention.

<10th Embodiment of a pants-type disposable diaper>
In the present invention, in addition to the shaping elastic member, the elastic member can be provided on the outer sheet 1 in various forms in order to fit the crotch portion. In the tenth embodiment, as shown in FIG. 17, in addition to the shaping expansion / contraction members 23F and 23B, leg expansion / contraction members 24 and 24 continuous along the leg opening are provided on the entire leg opening edges 6 and 6. It is the form fixed between the nonwoven fabrics of the outer shape sheet 1. In the present invention, it is desirable that the protruding width t of the leg opening edges 6 and 6 from the leg elastic members 24 and 24 is within 5 mm (preferably within 2 mm). In FIG. 17, the absorbent main body 10 is indicated by an imaginary line in order to make the leg elastic members conspicuous (the same applies to examples of FIGS. 18 and 19 described later).

  Such a leg-surrounding elastic member 24 is generally provided in order to contract the leg opening LO and prevent leakage of bodily fluids. According to the present invention, the protruding width t of the leg opening edges 6 and 6 is set to 5 mm or less. Combined with the contraction of the leg opening edge 6 by the shaping elastic members 23F and 23B, there is an effect of further reducing the flickering feeling of the leg opening edge 6 and further improving the appearance.

<Eleventh embodiment of a pants-type disposable diaper>
In the eleventh embodiment, as shown in FIG. 18, in the front body F and the back body B, the left leg opening edge 6 passes through the left leg opening edge 6 and crosses the crotch (inseam) part. The leg leg and the crotch elastic members 25F and 25B are fixed between the nonwoven fabrics of the outer sheet 1 by passing through the right leg opening edge 6 to the end of the side part. Moreover, in this example, the leg circumference / groin stretchable members 25F and 25B on the front body F side and the back body B side are partially crossed within a range R of 2 to 3 cm, particularly 4 to 6 cm before and after the crotch part 4. As a form to do.

  Also in this embodiment, if the protruding width t of the leg opening edges 6 and 6 from the leg surrounding portions of the elastic members 25F and 25B is within 5 mm (preferably within 2 mm), the leg opening is further increased as in the tenth embodiment. The flickering feeling at the edge 6 is further reduced.

<Twelfth embodiment of a pants-type disposable diaper>
As shown in FIG. 19, the twelfth embodiment is different from the twelfth embodiment in that the front and rear body B side leg and crotch elastic members 26 </ b> F and 26 </ b> B are arranged in front and rear of the crotch part 4. Although it passes within the range R of 2 to 3 cm, particularly 4 to 6 cm, it is a different form in that it does not intersect. Even in such a configuration, if the protruding width t of the leg opening edges 6 and 6 from the leg surrounding portions of the elastic members 26F and 26B is set to be within 5 mm (preferably within 2 mm), the leg opening edge is further increased as in the tenth embodiment. 6 flickering feeling is further reduced.

<Supplementary explanation about each form of the pants-type disposable diaper and other embodiments>
As can be inferred by comparing the above embodiments, the shaping elastic members 23F and 23B of the present invention are arranged and fixed continuously in parallel with the circumference of the trunk across the absorbent main body 10 and the absorbent core 13. It is not present in almost the whole part, and it is possible to adopt a form in which the arrangement is fixed only on the left and right sides of the product. Further, the shaping elastic member 23F of the front body does not exist in almost the entire part of the absorbent core 13, but is arranged and fixed only at the left and right side parts of the product, and the absorbent main body 10 is attached to the shaping compression member 23B of the rear body. It can be arranged and fixed continuously across the trunk and in parallel. Of course, the reverse is also possible.

  In particular, the leg opening edge 6 of the back body B has a length of protrusion from the absorbent core 13 that is longer than that of the front body F and is easy to open. Therefore, at least the leg opening edge 6 of the back body B is provided with the shaping elastic member 23B. In this case, the shaping elastic member 23F in the front body F can be omitted. Of course, a mode in which the shaping elastic member 23F is provided only on the front body F can be adopted.

  Further, when the standing cuff C is provided as in the above example, the side ends of the absorbent main body 10 are contracted in the direction around the legs by the elastic members 50, 50. 6 is easier to open. Therefore, the present invention is particularly suitable for a disposable diaper having such a standing cuff C.

  Further, when the crotch side end portion of the outer shape sheet 1 has the standing cuff C, it is 5 to 15 mm, particularly 5 to 5 mm from the standing end to the inside or outside from the side end of the absorbent core 13 when the standing cuff C is not provided. The leg circumference is preferably cut so as to enter or overhang by 10 mm. Thereby, the excess part of an external shape sheet decreases, and it becomes difficult to open the leg opening edges 6 and 6 further by a synergistic action with the shaping expansion-contraction members 23F and 23B of this invention.

  On the other hand, regarding the waist elastic members 20F and 20B and the lower waist elastic members 21F and 21B, the presence / absence of the waist elastic members 20F and 20B and the continuous / discontinuous portions corresponding to the absorbent core 13 can be arbitrarily selected.

  In the above example, the rectangular absorbent main body 10 is bonded to the hourglass-shaped outer sheet 1, but in the present invention, the liquid-permeable top sheet 11 having the same shape as the outer sheet 1 is provided, and the absorbent body AB is interposed therebetween. May be provided.

  In the above example, the sheet constituting the outer surface of the product is obtained by laminating and fixing two or more breathable / water-repellent nonwoven fabrics, but it may be a single nonwoven fabric, in which case the nonwoven fabric is used. An elastic member can be joined to the side. Furthermore, a plastic sheet can be interposed between the laminated nonwoven fabrics, or can be bonded to the use surface side of the backside nonwoven fabric.

  On the other hand, as shown in FIG. 20, a design sheet 100 can be provided at the center of the product (substantially the entire area of the absorbent core), and a design such as a character can be applied to the outer surface of the design sheet 100. This design portion has an absorption core 13 having a certain degree of rigidity, and the outer shape sheet 1 does not deform or cause wrinkles according to the present invention, so that the design can be clearly seen without breaking. It becomes. The design sheet 100 can be interposed between the external sheets. Further, it can be printed on the outer sheet 1 or printed on the back side of the liquid-impermeable back sheet 12. Furthermore, as shown in the figure, if the front and back of the character are applied corresponding to the front and back of the product, anyone can distinguish the front and back at a glance, making changing diapers fun, and the wearer will be pleased. Become. The configuration according to this design can also be applied to the tape-type disposable diaper described below.

<First embodiment of tape-type paper diaper>
As described above, the present invention covers not only pants-type disposable diapers but also tape-type paper diapers. This first embodiment is shown in FIG. 21 and FIG. In this example, upright sheets 41, 41 are provided on both sides, and elastic members 51, 51 are provided at the distal end portions of these free upright portions to constitute upright cuffs C, C. The standing sheet 41 is joined to the back sheet 1 similar to the outer sheet. Reference numeral 42 denotes a tape fastener for bringing the left and right sides on the back side into the left and right sides on the abdomen and joining them. In this example, between the nonwoven fabrics of the outer sheet (back sheet) 1 in the waist W at the longitudinal ends of the front body F and the back body B, in order to improve the fit around the waist, the waist opening WO The waist elastic members 20F, 20B,... Made of thin rubber thread are arranged and fixed under extension so as to expand and contract with an interval parallel to the edge. Further, lower waist elastic members 21F and 21B are provided along the waist direction in the lower abdomen of the front body F and the buttocks of the rear body B.

  And the shaping expansion-contraction members 23F and 23B of the present invention are attached from the leg opening edges 6 and 6 in the crotch region L to the vicinity of the absorption core 13 in parallel with the waistline, and in a range corresponding to the entire absorption core 13. Is not provided.

(Second embodiment of tape-type paper diaper)
A second embodiment is shown in FIGS. This form is an example which does not have a standing cuff. The elastic members 52, 52 are fixed between the liquid-permeable top sheet 11 and the back sheet 12 on the outer flap portion of the absorbent core 13. Also in this example, waist elastic members 20F, 20B... And lower waist elastic members 21F, 21B are provided.

  Also in this example, the shaping stretchable members 23F and 23B of the present invention are attached from the leg opening edges 6 and 6 in the crotch region L to the vicinity of the absorbent core 13 in parallel with the circumference of the trunk. It is not provided in the corresponding range.

<About elastic members>
As each elastic member of the present invention, in addition to materials such as natural rubber and synthetic rubber, elastic elastic materials such as urethane can be used. A thin elastic band or a sheet having a large area can also be used. Examples of these include a band such as urethane, a film or a sheet. As the film, a non-porous film or a perforated film can be appropriately selected, and as the sheet, a mesh-like sheet as described above can be appropriately selected. An arrangement example of the non-porous film 60 is shown in FIG. Moreover, the example of arrangement | positioning of the mesh-shaped film 61 was shown in FIG.

  DESCRIPTION OF SYMBOLS 1 ... Outline sheet, 10 ... Absorption main body, 11 ... Liquid-permeable top sheet, 12 ... Liquid-impermeable back sheet, 13 ... Absorption core, 14 crepe paper, 20F, 20B ... Waist elastic member, 21F, 21B ... Lower waist Stretch members, 23F, 23B ... shaping stretch members, 40 ... standing sheets, 50 ... stretch members, 60 ... non-porous films, 61 ... mesh films, AB ... absorbers, C ... standing cuffs.

Claims (7)

A pants-type disposable diaper having an outer core and an absorbent core extending in the longitudinal direction around the crotch part on the inner surface of the outer sheet, and having a waist opening and left and right leg openings,
The pants-type paper diaper consists of a waist area and a crotch area composed of a waist part and a lower waist part,
In the waist portion, a plurality of thread-like or narrow belt-like waist elastic members are provided in parallel in the circumferential direction with a certain interval in the longitudinal direction,
In the lower waist portion, a waist elastic member having a plurality of thicknesses of 620 dtex or less smaller than the stretching stress and the cross-sectional outer diameter of the waist elastic member extends over the longitudinal direction range of 60% or more of the lower waist region. Provided in parallel to the circumferential direction with an interval of 7 mm or less shorter than the interval of the members,
In the front body of the crotch region, a plurality of shaped elastic members having a thickness smaller than the outer diameter of the waist elastic member and a cross-sectional outer diameter of 620 dtex or less have an interval of 7 mm or less, which is shorter than the interval of the waist elastic member. Provided parallel to the circumferential direction,
The lower waist elastic member and the shaping elastic member are a distance between the lower waist elastic member provided at the lowermost part of the lower waist and the shaping elastic member provided at the uppermost part of the front body of the crotch region. Is a pants-type disposable diaper characterized by having a distance of 7 mm or less shorter than the distance between the waist elastic members and continuously provided in the vertical direction.   A pair of left and right leg elastic members extend along the leg opening in the crotch region, and the shaping elastic member intersects with the leg elastic member in the vicinity of the leg opening. The underpants type paper diaper according to 1.   The underpants type disposable diaper according to claim 1 or 2, wherein the lower waist elastic member and the waist elastic member are discontinuously provided at a central portion of the absorbent core.   The lower waist elastic member is provided from the left and right joints of the waistline region to corresponding positions on both sides of the absorbent core, and the lower waist elastic member extends and contracts between the joint and the corresponding position. The underpants type paper diaper of any one of claim | item 1-3.   The said shaping expansion-contraction member is each provided from the left and right leg opening edge part to the corresponding position of the both sides of an absorption core, and the said shaping expansion-contraction member expands-contracts between the said leg opening edge part and the said corresponding position. The underpants type paper diaper of any one of -4.   The underpants type disposable diaper according to any one of claims 1 to 5, wherein an interval between the lower waist elastic members and an interval between the shaping elastic members are the same interval.   The underpants type disposable diaper according to any one of claims 1 to 6, wherein the shaping elastic member is provided over a longitudinal range of 60% or more of the front body of the crotch region.

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