JP4750545B2 - Disposable paper diapers - Google Patents

Description

  The present invention relates to a disposable paper diaper in which a large number of elastic elastic members are disposed along the horizontal direction at least in a waist part and a waist part of the back body.

  As shown in FIG. 9, a tape-type paper diaper 50 that has been provided on the market in the past is provided with fastening members 54 and 54 on both sides of the back of the paper diaper for mounting. After the front body and the back body are respectively applied to the wearer's body, the fastening members 54 and 54 are brought to the ventral side, and are adhered to the surface of the liquid-impermeable back sheet 53 on the outer surface of the paper diaper. The paper diaper is fixed by being fixed to a front target tape 55 made of a plastic material such as the above.

  Further, in recent years, a disposable body having a plurality of elastic elastic members 56... 57. Diapers have been proposed. In this case, in order to prevent the absorber from being contracted in the region where the absorber is disposed, the elastic member is generally cut into pieces and discontinuous.

For example, in the following Patent Document 1, it is possible to easily attach the part where the tape is provided to either the back side or the abdomen side of the wearer for the purpose of preventing slipping or urine leakage. In a disposable diaper in which a waist elastic member and a waist elastic member are disposed on the body, a disposable diaper is disclosed in which an elongation stress in the width direction of the waistline portion is set larger than an elongation stress in the width direction of the waist portion.
JP 2002-291997 A

  As described above, in the case of the disposable diaper in which both the waist elastic member and the waist elastic member are arranged, when all the elastic members are arranged with the same stretching stress, the elastic member is cut in the overlapping region with the absorber. By doing so, the shrinkage rate on the waist part side is increased and the width dimension is decreased. Therefore, as shown in FIG. 7, the fastening member 54 faces obliquely upward, making it difficult to attach the diaper, and the fastening of the fastening member 54 to the front target tape 55 is oblique when the paper diaper is attached. Therefore, there was a problem that a slippage or the like was likely to occur due to inadequate mounting.

  On the other hand, in the disposable diaper described in Patent Document 1, the stretching stress in the width direction of the waistline portion is set to be larger than the stretching stress in the width direction of the waist portion. Similar problems occur because they are directed obliquely upward or obliquely downward.

  Accordingly, a main problem of the present invention is a disposable in which a large number of elastic elastic members are arranged along the horizontal direction at least in the waist part and the waist part of the back body, and the elastic elastic members are discontinuous in a region overlapping the absorber. In the diaper, the product width in the range from the waist part of the back body to the waistline part is made substantially the same width, so that the wearing of the paper diaper is facilitated and the lack of wearing etc. is eliminated.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and at least in the waist part and the waist part of the back body in the horizontal direction. The elastic elastic member group includes a first elastic elastic member group in which the elastic elastic member is discontinuously cut in a region where the absorber is substantially disposed, and the absorption member. In the disposable paper diaper that is located on the waist side from the back side edge of the body or the vicinity thereof, and composed of the second elastic stretchable member group that continues in the horizontal direction,
When the relationship of the following equation (1) is established between the elastic specifications of the first elastic elastic member group and the elastic specifications of the second elastic elastic member group, the waist part of the back body in the product state A disposable paper diaper is provided, characterized in that the widthwise dimension in a range extending around the waist is substantially the same.

In the first aspect of the present invention, the relationship of the above equation (1) is established between the elastic specifications of the first elastic elastic member group and the elastic specifications of the second elastic elastic member. it allows to substantially the same width in the width direction dimension of the range over waist portion from the waist portion of the back body in a product state. Therefore, it is possible to facilitate the mounting operation of the paper diaper, particularly the fixing of the fixing member to the front target tape, and it is possible to eliminate the mounting defect.

As the present invention according to claim 2, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and a large number of elastic elastic members along the horizontal direction at least at the waist part and the waist part of the back body And the elastic elastic member group includes a first elastic elastic member group in which the elastic elastic member is discontinuously cut in a substantially arrangement region of the absorber, and a back side edge of the absorber or In the disposable paper diaper which is located on the waist side from the vicinity thereof and is composed of the second elastic stretchable member group which is kept continuous in the horizontal direction,
When the relationship of the following equation (2) is established between the elastic specification of the first elastic elastic member group and the elastic specification of the second elastic elastic member, the waist part of the back body in the product state A disposable paper diaper is provided, characterized in that the widthwise dimension in a range extending around the waist is substantially the same.

In the present invention described in claim 2, the relationship of the above equation (2) is established between the elastic specifications of the first elastic elastic member group and the elastic specifications of the second elastic elastic member. Thereby, the width direction dimension of the range from the waist part of the said back body to the trunk periphery part is made into the substantially same width in a product state.

As the present invention according to claim 3, there is provided the disposable paper diaper according to any one of claims 1 and 2 , wherein a cutting area width of the first elastic elastic member group is 60 to 370 mm.

According to a fourth aspect of the present invention, the first elastic elastic member group and the second elastic elastic member group are formed over a range of 60 to 300 mm along the diaper longitudinal direction, and the arrangement interval is 2 to 15 mm. A disposable paper diaper according to any one of claims 1 to 3 is provided.

As the present invention according to claim 5 , in the waist portion, a design such as a pattern or a pattern is attached, and the design has a placement density in the central portion in the width direction relatively higher than a placement density in the waist side portion. The disposable diaper in any one of Claims 1-4 is provided.

In the invention according to claim 5, the visual effect of shrinking toward the center side by setting the arrangement density of the central portion in the width direction to be higher than the arrangement density of the waist side portions with respect to the treated design. Can be given.

  As described in detail above, according to the present invention, a large number of elastic elastic members are disposed along the horizontal direction at least in the waist and waist portions of the back body, and the elastic elastic members are discontinuous in the region overlapping the absorber. In the disposable diaper, the product width in the range from the waist part to the waist part of the back body can be made substantially the same width, so that the wearing of the paper diaper can be facilitated and the mounting defect etc. can be eliminated.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a partially broken development view of a disposable diaper according to the present invention, and FIG. 2 is an enlarged view of a main part.

  In FIG. 1, a disposable paper diaper (hereinafter simply referred to as a paper diaper) is made of a perforated or non-perforated nonwoven fabric or a perforated plastic sheet and the like, a liquid-permeable top sheet 2 covering the use surface side, and a nonwoven fabric outer surface of the paper diaper Cotton that covers the side and that is interposed between the backsheet nonwoven fabric 1 and the liquid-permeable topsheet 2 and the backsheet nonwoven fabric 1 that constitute the side flap portion SF together with the side gather nonwoven fabric 4 described later on both sides of the diaper. So as to cover at least the entire area of the absorbent body 3 between the absorbent body 3 and the back sheet nonwoven fabric 1 having a certain degree of rigidity, such as a rectangular shape (or hourglass shape, for example), which is made of a shaped pulp or the like. When the waterproof film 10 made of polyethylene or the like and the three-dimensional gather BS standing on the surface side are formed on both sides of the disposable diaper Moreover, the side gather nonwoven fabric 4 for constituting the side flap portion SF together with the backsheet nonwoven fabric 1 on both sides of the diaper, the fastening members 6 and 6 for attaching the paper diaper provided on the back side both sides, A front target tape 11 for fastening the fastening member 6 provided on the side surface, and a waist part and a waist part of the back body B for bonding to the backsheet nonwoven fabric 1 to form a shirring around the waist And a plurality of elastic elastic member groups 8 arranged along the horizontal direction, and a plurality of elastic elastic member groups 12, 12 arranged along the horizontal direction at the waist of the front body F. And is composed mainly of.

  In this invention, it replaces with the liquid-impermeable backsheet by polyethylene etc. which are normally used in order to cover the outer surface of a diaper, and the backsheet which consists of a nonwoven fabric is used, and between the absorber 3 and the backsheet nonwoven fabric 1 is used. Although a waterproof film 10 made of polyethylene or the like is interposed between the two, a paper diaper in which a liquid-impermeable back sheet is provided on the outer surface and the waterproof film 10 is omitted as in the related art.

The waterproof film 10 has the same shape as the absorbent body 3, and both side edges are formed to extend slightly laterally from the side edges of the absorbent body 3 (this portion is a laterally extended portion K _S). called.), it is fixed by such liquid-pervious top sheet 2 and the hot melt adhesive in this side extending portion K _S. The waterproof film 10 may have any shape as long as it can cover the absorber 3 larger than the side edges and upper and lower ends of the absorber 3.

  Moreover, the said back sheet nonwoven fabric 1 is laminated | stacked on the outer surface side of the said waterproof film 10, is extended to the position which comprises the outline of a paper diaper, and forms the side flap part SF with the side gather nonwoven fabric 4 mentioned later.

  In recent years, a film having moisture permeability is preferably used as the waterproof film 10 in terms of preventing stuffiness. This water and moisture permeable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then centrifuging in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

On the other hand, side gathers nonwoven 4, the width direction intermediate portion in the region spanning absorber 3 side edges from lateral extending portion K _S is fixed along a substantially longitudinal direction of the paper diaper, the side than the fixing portion The extending nonwoven fabric sheet portion together with the backsheet nonwoven fabric 1 constitutes a side flap SF. In the side flap portion SF, a plurality of elastic stretch members 7, 7 in the illustrated example are disposed between the side gather nonwoven fabric 4 and the back sheet nonwoven fabric 1 in the longitudinal direction of the paper diaper. GK is formed. This flat gather GK holds the paper diaper tightly around the legs when worn, thereby improving fit and preventing the paper diaper from shifting. In addition, when the paper diaper is held tightly, the three-dimensional gather BS is mounted upright along the legs without turning over.

  On the other hand, a three-dimensional gather BS standing on the surface side is formed by the nonwoven fabric sheet portion on the inner side of the fixed portion of the side gather nonwoven fabric 4. This three-dimensional gather BS has a standing end near the side edge of the absorbent body 3, and its tip is folded back twice along the longitudinal direction of the paper diaper, and one elastic elastic rubber 5 is placed inside the folded portion. If necessary, a plurality of elastic elastic rubbers are provided, and the three-dimensional gather BS is erected using the elastic force. As the elastic elastic rubber 5, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, and the like that are usually used can be used.

  Examples of the material fibers constituting the back sheet nonwoven fabric 1, the liquid-permeable top sheet 2, and the side gather nonwoven fabric 4 include olefin-based, polyester-based, and amide-based synthetic fibers such as polyethylene or polypropylene, rayon, cupra, and the like. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. As the side gather nonwoven fabric 4 and the back sheet nonwoven fabric 1 constituting the part SF, it is preferable to use a nonwoven fabric excellent in air permeability by suppressing the basis weight of rice in order to eliminate the feeling of stickiness and prevent stuffiness.

  In the present paper diaper, the side flap portion SF is made of a nonwoven fabric, so that the portion has liquid permeability. However, the liquid permeability is reduced as much as possible to prevent the passage of body fluids and to prevent the skin and the skin. It is desirable to use a water-repellent treated non-woven fabric coated with a silicon-based, paraffin metal-based, alkylchromic croid-based water repellent or the like in order to enhance the touch to the skin (dry feeling).

  On the other hand, the fastening member 6 for fixing the paper diaper to the body is inserted firmly between the back sheet nonwoven fabric 1 and the gather sheet nonwoven fabric 4 and firmly fixed by a hot melt adhesive or the like. Yes. Moreover, the back sheet nonwoven fabric outer surface (clothing surface side) and the inner end side of the base material may be joined by heat sealing or ultrasonic bonding. The said fastening member 6 is attached to the substantially continuous position so that it may interlock | cooperate with the elastic elastic members 8 ..., 9 ... arrange | positioned on the back side.

  A surface fastener sheet 13 having male / female mechanical fastener means on its surface is attached to the inner surface side of the fastening member 6 and has a female / male mechanical fastener function attached to the ventral side surface of the paper diaper. A paper diaper is attached to the body by being fastened to the front target tape 11 provided.

  The fastening member 6 may be given elasticity in the protruding direction of the tape, that is, the waist circumference direction. In order to give stretchability to the substrate, for example, a stretchable laminate sheet obtained by melt-laminating a thermoplastic resin to a nonwoven fabric, a stretchable laminate sheet obtained by point-bonding an elastomer film and a nonwoven fabric, and a nonwoven fabric / Examples thereof include a stretchable laminated sheet having a three-layer structure composed of an elastomer film / nonwoven fabric and point-bonding each layer at discontinuous joining points. Here, the nonwoven fabric needs to be stretchable in the direction of elongation. For example, it has a spunlace nonwoven fabric that has excellent extensibility because it does not have a joining point or a fusion point, or has a fusion point but a gap between each fusion point. A spunbonded nonwoven fabric or the like that has been given stretchability by shrinking or the like is suitable.

  The elastic elastic member groups 8, 9... Arranged in the waist part and the waist part of the back body B have a first elasticity in which the elastic elastic member is cut discontinuously in a substantially arrangement region of the absorber 3. The elastic member groups 8, 8, and the second elastic elastic member groups 9, 9, which are positioned on the waist side of the back end edge of the absorber 3 or in the vicinity thereof, and continue in the horizontal direction. Is done.

  The second region elastic elastic members 9, 9... Disposed in the end flap portion EF, which is a region in which the absorbent body 3 is not interposed, provide a disposable diaper by applying a stretching force so as to tighten around the waist portion of the wearer's body. Is to fit the body. The said end flap part EF is an area | region where only the said back sheet nonwoven fabric 1, the waterproof film 10, and the liquid-permeable top sheet 2 are extended, and the absorber 3 does not interpose, and is a waist opening edge part.

  The first region elastic elastic members 8, 8... Disposed in the region where the absorber 3 is interposed are located at the waist of the back body B in the waist region DL where the absorber 3 is interposed from the lower part of the end flap portion EF. This is for applying a stretching force in the horizontal direction to the surrounding portions. The first region elastic members 8, 8... Are not continuous in the central region where the absorber 3 is disposed in order to prevent the absorber 3 from being contracted, and are not provided with stretchability. ing. For example, as shown in Japanese Patent Application Laid-Open No. 2000-26015 and Japanese Patent Application Laid-Open No. 2002-273808, discontinuity of the elastic elastic member is performed by arranging various elastic elastic members on the back sheet 1 and then embossing cutter roll and anvil roll The back sheet is allowed to pass between the two, and the elastic elastic member existing within a predetermined range can be finely cut by pressurization or heating with the embossing cutter roll.

  The boundary between the first elastic elastic members 8, 8... And the second elastic elastic members 9, 9... Does not have to be exactly the back edge of the absorbent body 3, and may be in the vicinity thereof. That is, some of the second elastic stretchable members 9, 9...

  As the elastic elastic members 8 and 9, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester and the like which are usually used can be used. . The second region elastic elastic member 9 may be a sheet-like or ribbon-like composite material in which the above-described material is combined with a nonwoven fabric or paper.

  On the other hand, on the front body F side, a plurality of elastic elastic members 12, 12... Are arranged along the horizontal direction at the waist, and the second elastic elastic members 9, 9. A waist elastic band that is substantially continuous in the circumferential direction is formed.

  Next, a method for making the product width of the end flap portion EF and the waistline region portion DL substantially the same width on the rear body B side in the product state (a state in which the stretching force is effective) will be described in detail below.

  In the present diaper, the relationship of the following equation (1) is established between the elastic specifications of the first elastic elastic member group 8, 8... And the elastic specifications of the second elastic elastic members 9, 9. Further, the length, expansion / contraction rate, and cutting area width of each elastic expansion / contraction member 8... 9 are adjusted (see FIG. 2).

That is, the product width of the end flap portion EF portion, within ± 20% of the elongation at length L ₁ of the difference is almost the second elastic stretchable member group of the product width of the waistband region portion DL, preferably within 10%, More preferably, the product width in the range from the waist part to the waist part of the back body B is made substantially the same by adjusting the elastic specifications of the elastic elastic members 8... 9. It becomes possible to do. In the product width calculation formula, there are some errors depending on the rigidity of the back sheet 1, the top sheet 2, the waterproof film 10 and the like. Most of these errors are the end flap portion EF partial product width and the waist region region portion. It is offset by subtracting the product width of DL.

  By the way, the relationship of the following formula (2) is established between the elastic specifications of the first elastic elastic member groups 8, 8... And the elastic specifications of the second elastic elastic members 9, 9. The length, the expansion / contraction rate, and the cutting area width of each elastic expansion / contraction member 8 ..., 9 ... may be adjusted (see FIG. 2).

  In the above equation (2), the ratio of the product width of the end flap portion EF portion to the product width of the waistline region portion DL is 0.8 to 1.2, preferably 0.9 to 1.1. The product in the range from the waist part to the waist part in the back body B by adjusting the elastic specifications of the elastic elastic members 8... 9, preferably in the range of 0.95 to 1.05. The width is almost the same.

On the other hand, in this disposable diaper, as another condition, it is desirable that the cutting area width (L ₃ ) of the first elastic elastic member group 8, 8... Be 60 to 370 mm. Easier to wear can be improved by expanding the width of the diaper product by cutting the part that is under the infant's body and not applied with tension when worn.

  The first elastic elastic member groups 8, 8... And the second elastic elastic member groups 9, 9... Are formed over a range S of 60 to 300 mm along the longitudinal direction of the diaper. It is desirable that the thickness is 15 mm, preferably 3 to 8 mm. By arranging an elastic stretchable member over a wide range from the wearer's waist to the waistline and applying an even tightening force, the diaper can be fitted to the body shape, and it can reduce the marks caused by rubber, etc. It becomes possible.

  Further, the overall tension by the first elastic elastic member groups 8, 8... And the second elastic elastic member groups 9, 9... Is extended to 100 mm and then loosened to 70 mm. It is preferable that the tension at the time is 50 to 200 gf. If it is less than 50 gf, the stretch force is too weak and the fit is lacking, so that leakage or misalignment of the paper diaper is likely to occur, and if it is greater than 200 gf, the feeling of pressure on the abdomen increases or the wearer's body shape changes. If there is a mark, etc. will remain.

[Other examples]
(1) In the above embodiment, the paper diaper having a structure in which a large number of elastic elastic members 8, 9, etc. are arranged along the horizontal direction on the waist and waist of the back body B has been described in detail. Also in F, in addition to the waist elastic members 12, 12,..., The invention can be applied to a paper diaper in which a waist elastic elastic member is disposed.

(2) In the above embodiment, the elastic elastic member groups 12, 12,... Are arranged along the horizontal direction at the waist, but the elastic elastic member groups 12, 12,. is there.

(3) In the above embodiment, the present invention has been described by taking a tape-type paper diaper as an example. However, the present invention can be similarly applied to a pants-type paper diaper. As shown in FIGS. 4 to 6, the pants-type disposable paper diaper is an absorbent 23 such as cotton-like pulp between a liquid-permeable surface sheet 21 made of nonwoven fabric or the like and a leak-proof sheet 22 made of polyethylene or the like. Between the absorbent body 20 and the exterior sheet 30 integrally provided on the outer surface side of the leak-proof sheet 22, and the front body F and the back body B of the exterior sheet 30 are on both sides in the product state. It is a paper diaper having a structure in which a waist opening and a pair of left and right leg openings are formed by being joined at a portion.

  The outer sheet 30 is a non-woven sheet having a two-layer structure in which an upper layer non-woven fabric 30A and a lower layer non-woven fabric 30B are bonded by a hot melt adhesive or the like, and is shown in FIG. As described above, in each of the front body F and the back body B, a large number of elastic elastic members are disposed along the horizontal direction at the waist and the waistline. These elastic elastic members include a first elastic elastic member group 8, 8... (DL elastic elastic members) in which the elastic elastic members are discontinuously cut substantially in the region where the absorber 23 is disposed, and the absorber. 23, which is located on the waist side of the back side edge or the vicinity thereof, and is composed of second elastic elastic member groups 9, 9... (Elastic elastic members in the EF region) which are kept continuous in the horizontal direction. In each of the front body F and the back body B, the above formula (between the elastic specifications of the first elastic elastic member group 8, 8 ... and the elastic specifications of the second elastic elastic members 9, 9 ... By adjusting the stretched length, stretch rate, and cutting area width of each elastic stretchable member 8... 9 so that the relationship of 1) or (2) is established, the waistline from the waist in the product state. It is possible to make the product width in the range over the part substantially the same width. In addition, about the said 1st elastic elastic member group 8,8 ... and the 2nd elastic elastic member group 9,9 ..., as FIG. 8 shows, it is two steps | paragraphs of nonwoven fabric sheets and the folded nonwoven fabric sheet by another process. The elastic elastic sheet 40 with the elastic elastic members 8... 9 interposed therein may be prepared and disposed between the upper nonwoven fabric 30A and the lower nonwoven fabric 30B.

(4) In the end flap portion EF, when a design such as a pattern or a pattern is attached, as shown in FIG. 7, the design has an arrangement density of the central portion in the width direction higher than an arrangement density of the waist side portions. A relatively high density is desirable. As a result, it is possible to emphasize a visual effect that shrinks toward the center.

It is a partially broken developed view of the paper diaper according to the present invention. It is the principal part enlarged view. It is a perspective view which shows a product state. It is a perspective view of a pants type disposable diaper. It is a perspective view which shows the assembly point. 4 is a development view of the exterior sheet 30. FIG. It is a figure at the time of giving design, such as a pattern or a pattern, to the end flap part EF. 6 is a perspective view showing another example of the exterior sheet 30. FIG. It is a figure which shows the product state of the conventional tape-type paper diaper.

  DESCRIPTION OF SYMBOLS 1 ... Back sheet nonwoven fabric, 2 ... Liquid-permeable top sheet, 3 ... Absorber, 4 ... Side gather nonwoven fabric, 6 ... Fastening member, 8 ... 1st elastic elastic member, 9 ... 2nd elastic elastic member, 10 ... Waterproofing Film, 11 ... front target tape, 13 ... hook-and-loop fastener sheet, EF ... end flap, DL ... waistline region

Claims (5)

An absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and a large number of elastic elastic members are disposed along the horizontal direction at least at the waist part and the waist part of the back body. The member group is positioned on the waist side of the first elastic stretchable member group in which the elastic stretchable member is discontinuously cut in the substantially disposed region of the absorbent body and the back side edge of the absorbent body or the vicinity thereof. In the disposable paper diaper composed of the second elastic stretchable member group that continues in the horizontal direction,
When the relationship of the following equation (1) is established between the elastic specifications of the first elastic elastic member group and the elastic specifications of the second elastic elastic member group, the waist part of the back body in the product state A disposable paper diaper characterized in that the widthwise dimension in a range extending around the waist is substantially the same.

An absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and a large number of elastic elastic members are disposed along the horizontal direction at least at the waist part and the waist part of the back body. The member group is positioned on the waist side of the first elastic stretchable member group in which the elastic stretchable member is discontinuously cut in the substantially disposed region of the absorbent body and the back side edge of the absorbent body or the vicinity thereof. In the disposable paper diaper composed of the second elastic stretchable member group that continues in the horizontal direction,
When the relationship of the following equation (2) is established between the elastic specification of the first elastic elastic member group and the elastic specification of the second elastic elastic member, the waist part of the back body in the product state A disposable paper diaper characterized in that the widthwise dimension in a range extending around the waist is substantially the same.

The disposable paper diaper according to claim 1 , wherein a cutting area width of the first elastic elastic member group is 60 to 370 mm. The first elastic stretchable member groups and the second elastic stretchable member group is formed over a range of 60~300mm along the diaper longitudinal direction, the arrangement interval in any one of claims 1 to 3 in a 2~15mm The disposable disposable diaper described. In the waist portion, with subjecting the design of such patterns or pictures, the design according to claim 1-4 or you have relatively higher density than the arrangement density of the waist side portions of the arrangement density of the widthwise central portion Disposable diapers.

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