JP4130187B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having a waistband portion.

  In a deployable disposable diaper having a waistband portion extending laterally from the left and right side edges of the back side area of the diaper, the waistband portion is a liquid-permeable topsheet, and also a liquid-permeable backsheet, A disposable diaper configured with an absorbent body disposed between both sheets is known (see Patent Document 1). In this diaper, after the liquid that has flowed out to the front side of the wearer is temporarily absorbed by the absorbent body of the waistband part, it is reabsorbed by the absorbent body located on the ventral side part of the diaper body. .

  In this diaper, the liquid temporarily absorbed by the absorber of the waistband part is reabsorbed by the absorber of the diaper body through the liquid-permeable back sheet. That is, the liquid oozes out to the outer surface of the waistband part. As a result, the waistband portion becomes wet with the liquid. Therefore, when changing a diaper, it must have a waistband part wet with the liquid, and it cannot be said that it is hygienic. In addition, the wearer's skin tends to be moistened by the waistband portion wetted with the liquid, and the rash is likely to occur.

Japanese Patent Laid-Open No. 3-123550

  Therefore, the objective of this invention is providing the disposable diaper which can eliminate the various fault which the prior art mentioned above has.

The present invention includes a crotch region, a first region located on one end side thereof, a second region located on the other end side, and a waistband portion extending laterally from both side edges of the first region. , A disposable diaper configured such that both waistband portions are coupled to each other on the wearer's belly side or dorsal side, and the second zone is coupled to the coupled waistbands for wearing.
At least one waistband portion is disposed between the two sheets, a liquid-permeable sheet disposed on the wearer's skin side, a liquid-impervious or water-repellent sheet disposed on the side far from the wearer's skin, and The object is achieved by providing a disposable diaper provided with an absorbent body including a web having hydrophilic long fibers.

The present invention also includes a crotch region, a first region located on one end side thereof, a second region located on the other end side, and a waistband portion extending laterally from both side edges of the first region. A diaper cover configured to couple the waistband portions to each other on the wearer's belly side or dorsal side, and to join and wear the second area to the joined waistbands,
At least one waistband portion is disposed between the two sheets, a liquid-permeable sheet disposed on the wearer's skin side, a liquid-impervious or water-repellent sheet disposed on the side far from the wearer's skin, and A diaper cover provided with an absorbent body including a web having hydrophilic long fibers.

  According to the disposable diaper and the diaper cover of the present invention, the liquid that has flowed out through the skin of the wearer is absorbed by the absorbent body through the liquid-permeable sheet of the waistband part, so that liquid leakage from the waist part is effectively performed. Is prevented. When the web having the hydrophilic long fibers constituting the absorbent body is oriented in the longitudinal direction of the waistband portion, the liquid is easily diffused in the width direction of the diaper, so that liquid leakage is more effectively prevented. . Since the sheet placed on the side of the waistband away from the wearer's skin is liquid-impervious or water-repellent, the liquid absorbed by the absorber of the waistband does not bleed out, and as a result the waistband The outer surface of the part does not get wet with the liquid. Therefore, it is possible to perform hygienically the operation of changing the diaper by releasing the connection of the waistband portions. Since the web having the hydrophilic long fibers constituting the absorbent body of the waistband part is easy to evaporate the liquid, the skin of the wearer is kept in a dry state, and it is difficult for the skin to occur. Since the absorbent body of the waistband portion including the web having hydrophilic long fibers is highly flexible and difficult to break, the waistband portion is easy to fit the wearer's body, and the operation of combining both waistband portions is easy to perform. .

  The present invention will be described below based on preferred embodiments with reference to the drawings. The diaper 1 of the embodiment shown in FIG. 1 has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-retaining absorbent core 4 interposed between both sheets 2 and 3. And is formed substantially vertically. The diaper 1 has the crotch area C, the 1st area A located in the one end side, and the 2nd area B located in the other end side. The diaper 1 has a longitudinal direction that is a direction connecting the first area A and the second area B, and a width direction that is a direction orthogonal to the longitudinal direction.

  The absorbent core 4 is sandwiched and fixed by the top sheet 2 and the back sheet 3. A waist elastic member 51 and a leg elastic member 61 for fitting each part to the diaper wearer are disposed on the waist 5 and the leg 6 at the peripheral edge of the absorbent body 4. Solid guards 7 are respectively formed on the left and right sides of the diaper 1 in the longitudinal direction. A three-dimensional guard elastic member 71 is disposed at the free end of the three-dimensional guard 7 to form a gather.

  Waistband portions 10 and 10 that extend laterally are connected to the left and right side edges of the first section A, respectively. A band fastening portion 11 is provided at one end of the waistband portions 10 and 10. The band fastening part 11 joins both the waist band parts 10 and 10 on the wearer's belly side or back side. On both sides of the second section B on the surface sheet 2 side, diaper fastening parts 20 and 20 for joining the second section B to both the waistband parts 10 and 10 in the joined state are provided. As the band fastening part 11 and the diaper fastening part 20, for example, hook members of hook-and-loop fasteners can be used. When using this hook member, it is preferable that the constituent material of the site | part to which this hook member is fixed is a material which can engage with this hook member, for example, a nonwoven fabric.

  The waistband portion 10 has a substantially band shape whose width gradually decreases from the base end 13 toward the tip end 14. As shown in FIG. 4, the waistband part 10 includes a liquid-permeable sheet 15 disposed on the skin side of the wearer, and a liquid-impermeable or water-repellent sheet 16 disposed on the side far from the wearer's skin. And an absorbent body 17 disposed between the two sheets. The absorber 17 includes a web having hydrophilic long fibers. The web is oriented in the longitudinal direction of the waistband portion 10 (the direction connecting the proximal end 13 and the distal end 14). The absorber 17 is arranged over substantially the entire region in the longitudinal direction of the waistband portion 10. In addition, in this embodiment, the longitudinal direction of the waistband part 10 corresponds with the width direction of the diaper 1.

  An example of a procedure for wearing the diaper 1 is shown in FIGS. First, as shown in FIG. 2, the first section A is brought into contact with the back side of the wearer 30, and both waist band portions 10 a and 10 b are brought to the abdomen side of the wearer 30. Then, one waistband portion 10a is overlapped with the other waistband portion 10b, and the band fastening portion 11 provided at the tip of the one waistband portion 10a is replaced with the back surface of the other waistband portion 10b. Engage and fasten to the seat side. Next, the second section B is pulled up to the abdomen along the crotch of the wearer 30, and the diaper fastening parts 20, 20 are engaged and fastened on both the waistband parts 10, 10 as shown in FIG. 3. To do. In this example, both the waistband portions 10 and 10 are coupled on the wearer's ventral side, but conversely, the first zone A is brought into contact with the wearer's 30 abdomen side, 10 and 10 can be combined and mounted on the back side of the wearer 30.

  When the excreted liquid flows out through the wearer's skin during wearing of the diaper 1 of the present embodiment, the liquid is absorbed by the absorbent body 17 through the liquid-permeable sheet 15 of the waistband part 10. Accordingly, liquid leakage from the waist portion 5 is effectively prevented. In particular, in the diaper 1 of the present embodiment, the web having hydrophilic long fibers constituting the absorbent body 17 is oriented in the longitudinal direction of the waistband portion 10 (the direction connecting the proximal end 13 and the distal end 14). The liquid absorbed by the web is preferentially diffused in the orientation direction, that is, the width direction of the diaper 1. As a result, liquid leakage is more effectively prevented.

The amount of liquid flowing out through the wearer's skin is small compared to the amount of liquid absorbed by the absorbent core 4 of the diaper 1. Therefore, the absorption capacity of the absorbent body 17 provided in the waistband portion 10 can be made lower than the absorption capacity of the absorption core 4 of the diaper 1. From this viewpoint, the basis weight of the web having hydrophilic long fibers contained in the absorber 17 is preferably 5 to 150 g / m ² , particularly preferably 10 to 100 g / m ² . The basis weight within this range is advantageous from the viewpoint of making the waistband portion 10 flexible as will be described later.

  Since the sheet forming the outer surface of the waistband portion 10, that is, the sheet 16 disposed on the side far from the wearer's skin, is liquid-impervious or water-repellent, the liquid absorbed by the absorbent body 17 is absorbed in the waistband portion 10. It does not ooze out to the outside. As a result, the outer surface of the waistband portion 10 does not get wet with the liquid. Therefore, it is possible to perform hygienically the operation of releasing the coupling of the waistband portion 10 and replacing the diaper.

  The liquid-impermeable or water-repellent sheet 16 is composed of a water-repellent nonwoven fabric, a thermoplastic resin film, or the like. Examples of the water-repellent nonwoven fabric include spunbond nonwoven fabric, spunbond-meltblown-spunbond nonwoven fabric, spunbond-meltblown-meltblown-spunbond nonwoven fabric, spunlace nonwoven fabric, and meltblown nonwoven fabric. Examples of the thermoplastic resin film that can be used include those obtained by kneading a thermoplastic resin and an organic or inorganic filler to form a film and then stretching, a urethane-based or ester-based non-porous moisture-permeable film, and the like. When a thermoplastic resin film is used, the film preferably has moisture permeability. On the other hand, as the liquid-permeable sheet 15, a perforated film made of a hydrophilic nonwoven fabric or a thermoplastic resin can be used.

  Since the web having the hydrophilic long fibers constituting the absorbent body 17 of the waistband portion 10 easily evaporates, the liquid absorbed by the absorbent body 17 easily evaporates without requiring a long time. As a result, the skin around the wearer's belly (waistline) surrounded by the waistband part 10 is kept dry, and it is difficult for the skin to occur.

  Long fibers are hydrophilic. What is used in the present invention as a long fiber having hydrophilicity is a long fiber that is inherently hydrophilic, and inherently has no hydrophilicity, but is hydrophilic by being subjected to a hydrophilic treatment. Both of the long fibers to which is given are included. Moreover, although the long fiber itself does not have hydrophilicity, what has hydrophilicity as the whole web is also included. The long fiber itself does not have hydrophilicity. However, the hydrophilic property of the entire web is, for example, a web made of hydrophilic material integrated with a web made of non-hydrophilic long fibers. Is mentioned. A preferred long fiber is a long fiber that is inherently hydrophilic. In particular, long fibers of acetate and rayon are preferred. In particular, since acetate has a good liquid evaporation property, the use of this solution can effectively prevent the above-mentioned blisters from occurring.

  There is no restriction | limiting in particular in the fiber diameter of a long fiber. In general, satisfactory results are obtained by using long fibers of 1.0 to 7.8 dtex, in particular 1.7 to 5.6 dtex. In the present specification, the long fiber means a fiber having a fiber length of preferably 70 mm or more, more preferably 80 mm or more, and even more preferably 100 mm or more when the fiber length is measured by the average fiber length measurement method (Method C) of JIS L1015. Say. However, when the total length of the web to be measured is less than 100 mm, preferably 50% or more, more preferably 70% or more, more preferably 80% or more of the fibers in the web extend over the entire length of the web. In this case, it is assumed that the fibers of the web are long fibers.

The web having long fibers has a density of 0.005 to 0.20 g / cm ³ , and particularly 0.01 to 0.10 g / cm ³ , in that the liquid permeability is good and the absorbent body is flexible. It is preferable from the standpoint of maintaining the temperature and absorbing the liquid quickly.

  There is also an advantage that the waistband portion 10 can be made flexible by using a web having long fibers as a constituent material of the absorbent body 17 of the waistband portion 10. Details are as follows. As a liquid-absorbing material for disposable diapers, pulverized pulp is generally used. Since pulverized pulp is a stiff material, diapers using pulverized pulp tend to be difficult to fit the wearer's body. On the other hand, since the web having long fibers is a flexible material, the waistband portion 10 can be made flexible by using this as the absorber 17 of the waistband portion 10. This makes it easier to fit the wearer's body. Moreover, it becomes easy to perform operation (refer FIG. 2) which couple | bonds both waist band parts.

  In the pulverized pulp generally used as a liquid absorbing material for disposable diapers, an integral structure as an absorbent body is easily broken by liquid absorption. On the other hand, even if the web having long fibers absorbs liquid, the integral structure as an absorber is not easily broken. Also from this point of view, it is advantageous to use a web having long fibers as the absorbent body 17 of the waistband portion 10.

  The absorbent body 17 of the waistband portion 10 may contain a superabsorbent polymer in addition to the web having hydrophilic long fibers. Thereby, the absorption capacity of the absorber 17 can be improved. When the absorber 17 includes a superabsorbent polymer, the superabsorbent polymer is preferably embedded and supported in the web from the viewpoint of preventing the polymer from falling off. The buried support is a state in which the superabsorbent polymer enters the space formed by the hydrophilic long fibers forming the web, and the polymer is not easily moved or dropped even by a severe operation of the wearer. Say. In the state of being buried and supported, the superabsorbent polymer is attached to the hydrophilic long fibers by entanglement or catching. Or it adheres to the hydrophilic long fiber by the adhesiveness of the superabsorbent polymer itself. The space formed by the hydrophilic long fibers is easily deformed when subjected to stress from the outside. However, since the stress can be absorbed by the entire hydrophilic long fiber, the space is prevented from being destroyed. From the viewpoint of reliably supporting the superabsorbent polymer, it is preferable to use a crimped long fiber. A web having crimped long fibers has a number of spaces capable of holding particles. The superabsorbent polymer is retained in the space. As a result, even if the absorbent body 17 contains a large amount of superabsorbent polymer, it will not easily fall off. Further, the structure of the absorbent body 17 is not easily destroyed even when the coupling and the release of both the waistband portions 10 are repeated.

When the long fiber is crimped, the crimp rate (JIS L 0208) is preferably 20 to 90%, and more preferably 40 to 90%. By using a web having long fibers having a crimping ratio in this range, it becomes easy to stably carry a highly absorbable polymer in a large amount. There is no particular limitation on the means for crimping the long fibers. Further, the crimp may be two-dimensional or three-dimensional. The crimp rate is the length (A) when the long fiber is stretched straight and without stretching the fiber itself, and the length of the straight line (B) between the start point and the end point of the fiber in the natural state. ) Is defined as a percentage of the length when stretched, and is calculated from the following equation.
Crimp rate = (A−B) / A × 100 (%)

  The crimp rate of the long fibers is as described above, and the number of crimps is preferably 2 to 25, particularly 4 to 20, especially 10 to 20 per cm.

  In order to embed and carry a superabsorbent polymer on a web having crimped long fibers, for example, the following method can be used. First, a web having long fibers having the crimp rate described above is prepared. The web is opened by a predetermined means. For the opening, for example, an air opening device using compressed air can be used. Next, the opened web is stretched to a predetermined length. In this case, it is not necessary to stretch the long fiber completely, and it is sufficient to stretch the superabsorbent polymer so as to be stably embedded and held in the web.

  Various adhesives such as hot melt pressure-sensitive adhesive are applied to the web with the long fibers stretched. For the coating, it is preferable to use a spray coating capable of successfully performing dot-like adhesion. The adhesive is preferably applied in such a low amount that the liquid does not pass through the web.

  After the application of the adhesive is completed, the superabsorbent polymer is spread in layers on the web. Release the stretched state of the long fiber after spraying is completed. As a result, the stretched long fibers contract. As a result, the superabsorbent polymer is retained in the space formed by the shrinkage of the long fibers. In this way, the superabsorbent polymer is buried and supported in the web. If necessary, a web prepared separately may be overlaid thereon. As a result, the two webs are bonded in the form of dots.

  When the absorber 17 includes a superabsorbent polymer in addition to the web having hydrophilic long fibers, it is preferable that the amount of the superabsorbent polymer is relatively large with respect to the amount of the web having long fibers. Specifically, when viewed with the absorbent body 17 as a whole, it is preferable that the basis weight of the superabsorbent polymer is not less than the basis weight of the web, particularly not less than 2 times, particularly not less than 3 times. As a result, the absorber 17 can be made thinner and have a lower basis weight. The upper limit of the ratio of the basis weight of the superabsorbent polymer to the basis weight of the web is determined from the viewpoint of extreme movement of the superabsorbent polymer and prevention of falling off. Although depending on the degree of crimping of the long fibers, if the upper limit is about 10 times, the superabsorbent polymer is unlikely to move or drop out even if the wearer performs a violent operation.

  As the superabsorbent polymer, a particulate polymer is generally used. However, it is not limited to this, and a fibrous one may be used. When using a particulate superabsorbent polymer, if the shape is an irregular type, a block type, or a bowl type, it should be embedded and supported at a basis weight equal to or more than 10 times the basis weight of the web. Can do. In the case of a spherical particle aggregation type or a spherical type, it can be embedded and supported at a basis weight equal to or more than 5 times the basis weight of the web. It is desirable to select the former particle shape when it is desired to achieve both high absorption and thinning, and to select the latter particle shape when emphasis is placed on the texture (reducing the shakiness of the superabsorbent polymer). A part of the superabsorbent polymer is embedded and supported in the web, or almost all of the superabsorbent polymer is embedded and supported in the web depending on the manufacturing conditions of the absorber 17. As described above, since the long fiber has crimps, it has a large number of spaces capable of holding particles. The superabsorbent polymer is retained in the space. As a result, even if a large amount of superabsorbent polymer is sprayed, the extreme movement or dropout is less likely to occur. Moreover, even if a wearer performs intense operation | movement, the structure of the absorber 17 becomes difficult to be destroyed. Depending on the superabsorbent polymer used, the crimp rate and the amount of long fibers used are adjusted as appropriate.

  “Uniform” means the variation in the amount of the superabsorbent polymer in the thickness direction or width direction of the web when the superabsorbent polymer is completely uniformly arranged and when a part of the web is taken out. Means a case where the basis weight has a distribution within 2 times. Such a variation is caused by rarely supplying a superabsorbent polymer excessively and producing a part with an extremely high spraying amount in manufacturing the absorber 17. In other words, the above “uniform” includes cases where inevitably variations occur, and does not include cases where the superabsorbent polymer is distributed so as to intentionally vary.

  The following method can be used as an evaluation method to the extent that the superabsorbent polymer is buried and supported. The central portion in the longitudinal direction of the web produced to 100 × 200 mm is cut to obtain a 100 × 100 mm test piece. This cut surface is directly below, and vibration is applied to the left and right 20 times at a speed of once / second with an amplitude of 5 cm. Measure the weight of polymer dropped from the cut surface. When the weight of the dropped superabsorbent polymer is 25 wt% or less, particularly 20 wt% or less, especially 10 wt% or less, based on the total amount of the superabsorbent polymer present in the test piece, It can be said that this is a state in which the extreme movement and dropout of the functional polymer are difficult to occur.

  The following evaluation method can also be performed on the test piece subjected to the drop evaluation test. 50 g of physiological saline (0.9 wt% NaCl) is evenly sprayed on the test piece subjected to the test for dropout evaluation, and the way of swelling of the test piece is visually observed. When the variation in the thickness of the test piece is within 2 times, it can be said that it is difficult for the superabsorbent polymer to move or drop off.

  In each of the evaluation methods described above, when the web is viewed in the horizontal direction, the test piece is sampled from a region where the superabsorbent polymer is dispersed with the same basis weight.

  If the superabsorbent polymer is not sufficiently embedded in the web, use hot melt, various binders (for example, acrylic emulsion adhesives), sugar derivatives such as carboxymethyl cellulose and ethyl cellulose, thermoplastic resins such as polyethylene, etc. Can be added as appropriate. Furthermore, you may use together the sheet | seat etc. which gave uneven | corrugated processing or flocking.

  In addition to the superabsorbent polymer, the absorber 17 is made of other particles such as activated carbon, silica, alumina, titanium oxide, various viscosity minerals (zeolite, sepiolite, bentonite, cancrinite, etc.), and inorganic and inorganic particles (deodorant). Agent or antibacterial agent). As the inorganic particles, those partially substituted with metal sites can be used. Alternatively, various organic and inorganic buffering agents, that is, acetic acid, phosphoric acid, citric acid, succinic acid, adipic acid, malic acid, lactic acid and salts thereof may be used alone or in combination, and various amino acids may be included. . The function of these components is to suppress the odor of the liquid absorbed by the absorber 17 and the odor derived from the material. In addition, various organic and inorganic buffering agents neutralize excrement, for example, ammonia generated by decomposition of urine, and have an effect of keeping the diaper neutral to weakly acidic. Even if there is liquid return of excrement to the skin, the effect on the skin is reduced. Alternatively, even when a fiber having an ester in the molecular structure such as an acetate fiber is used as the web having a long fiber, an effect of preventing damage due to alkali can be expected.

  The absorber 17 having the above structure is thin, flexible, and has an appropriate structural stability. Appropriate values are selected for the thickness and basis weight of the absorbent body 17 according to the specific application of the absorbent article. When the absorbent body 17 is used for a waistband part of a disposable diaper, the thickness of the absorbent body 17 is 0.5 to 4 mm, particularly 1 to 3 mm, regardless of the shape. Preferably there is.

  It is desirable that the waistband part 10 provided with the absorber 17 is flexible. As an evaluation of flexibility, it is preferable that a measured value by a handle-ometer is 4N or less, particularly 2N or less. The measurement method using the handle-o-meter is as follows. Measurement is performed according to JIS L1096 (flexibility measurement method). A waistband section cut by 150 mm in the longitudinal direction (direction connecting the base end 13 and the distal end 14) and 50 mm in the width direction is arranged in a direction orthogonal to the grooves on a support base in which a groove having a width of 60 mm is carved. The force required when the center of the waistband is pushed with a blade having a thickness of 2 mm is measured. The apparatus used in the present invention is a texture testing machine (handle-of-meter method), HOM-3 type, manufactured by Daiei Kagaku Seiki Seisakusho. The average value of the three points is taken as the measured value.

  Even when the liquid-permeable sheet 15 and the liquid-impervious or water-repellent sheet 16 as a constituent material of the waistband part 10 or the whole thereof has elasticity, it is preferable that the long fibers are crimped. . Thereby, the stretchability of the waistband part 10 can be ensured as a whole, and it becomes easier to fit the waistband part 10 to the wearer's body. When imparting stretchability to a part of the waistband portion 10, for example, the region in the vicinity of the proximal end 13 of the waistband portion 10, specifically, the region indicated by reference numeral 12 in FIG. Can do. The stretchable region 12 is stretchable in the width direction and / or the longitudinal direction of the diaper 1.

The liquid-impermeable or water-repellent sheet 16 preferably has water vapor permeability. The degree of water vapor permeability (moisture permeability) is preferably 1.0 to 3.5 g / (100 cm ² · h), more preferably 1.2 to 3.0 g / (100 cm ² · h). Moisture permeability Within this range, it is possible to prevent the oozing of the liquid trapped in the absorber 17 while ensuring sufficient water vapor permeability and prevent the occurrence of stuffiness and blurring. The moisture permeability is measured according to JIS Z0208 (cup method) under the condition of 30 ° C./90% RH.

  The liquid-impervious or water-repellent sheet 16 having water vapor permeability may be a porous sheet alone or a composite of sheets such as nonwoven fabric and paper and fibers.

  When a porous sheet is used as the water vapor permeable sheet, the porous sheet is a porous sheet formed by stretching a sheet formed from a melt-kneaded product of the resin composition. The porous sheet preferably has sufficient moisture permeability of the sheet while maintaining moldability and sheet strength. In addition, the obtained sheet may be subjected to embossing or various surface treatments as necessary, and may be used in combination with other sheets such as nonwoven fabric or paper.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, although the said embodiment concerns a disposable diaper, this invention can also be applied to a diaper cover. Such a diaper cover has a form similar to that of the disposable diaper of the above-described embodiment that does not include the absorbent core 4, and has a first area located on one end side in the longitudinal direction and a second end side. A second region located; a crotch region located between the two regions; and a waistband portion extending laterally from both side edges of the first region, wherein both waistband portions are disposed on the stomach side or back of the wearer. They are joined to each other on the side, and the second section is joined and worn on both joined waistbands. And at least one waistband part is a liquid-permeable sheet arranged on the wearer's skin side, a liquid-impermeable or water-repellent sheet arranged on the side far from the wearer's skin, and both sheets And an absorbent body including a web having hydrophilic long fibers arranged. Such a diaper cover also has the same effect as the disposable diaper of the embodiment described above.

  Moreover, in the said embodiment, although both the waist band parts 10 and 10 were equipped with the liquid-permeable sheet 15, the liquid-impervious thru | or water-repellent sheet 16, and the absorber 17, it replaced with this and either waist band Only the portion 10 may include the liquid permeable sheet 15, the liquid impermeable or water repellent sheet 16, and the absorber 17. When only one waistband portion 10 includes the liquid-permeable sheet 15, the liquid-impervious or water-repellent sheet 16, and the absorber 17, the waistband portion 10 comes into contact with the wearer's body. The both waistband portions 10 are joined together.

  Moreover, in the said embodiment, although the absorber 17 was distribute | arranged over the substantially whole region of the longitudinal direction of the waistband part 10, it replaces with this and the absorber 17 is biased near the front-end | tip 14 of the waistband part 10. It may be arranged.

  Moreover, in the said embodiment, although the web which has a long fiber was orientated in the longitudinal direction of the waistband part 10, the orientation direction of a web is not restricted to this. For example, the web may be oriented in a direction orthogonal to the longitudinal direction of the waistband portion 10.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited to such examples.

[Example 1]
The absorber used for a waistband part was manufactured. First, a web having crimped long fibers of acetate fibers was prepared. The crimp ratio of this fiber was 70%, the number of crimps per 1 cm was 15, and the fiber diameter was 2.2 dtex. The web was opened to a width of 100 mm using an air opening device and then stretched to ½ of the maximum extension length. Under this condition, a hot melt adhesive was spray coated on the upper surface of the spread web. The coating amount was 5 g / m ² . Subsequently, the superabsorbent polymer particles were uniformly sprayed in a layered manner at a spraying basis weight of 100 g / m ² on the coated surface of the hot melt adhesive. After spreading, the spread state of the spread web was released. As a result, the spread web contracted and the superabsorbent polymer particles were embedded and held in the spread web. The basis weight of the spread web was 25 g / m ² . Subsequently, the whole was wrapped with a tissue paper having a basis weight of 16 g / m ² to obtain an absorbent body. The air-through nonwoven fabric is stacked on the skin contact surface side of the obtained absorbent body, and the spunbond-meltblown-meltblown-spandondo (SMMS) nonwoven fabric is stacked on the skin non-contact surface side and bonded with hot melt, and the waistband portion is bonded. Formed. The air-through nonwoven fabric was composed of a core-sheath type composite fiber (thickness 2.1 dtex, surface treatment with a surfactant, liquid permeability) having a core made of polypropylene and a sheath made of linear low density polyethylene. The SMMS had a basis weight of 15 g / m ^{2 and} was water repellent and moisture permeable. The basis weight of the entire waistband portion was 212 g / m ² and the thickness was 1.5 mm.

The disposable diaper shown in FIG. 1 was manufactured using the obtained waistband part. As the surface sheet, an air-through nonwoven fabric (having liquid permeability) of a core-sheath type composite fiber having a basis weight of 25 g / m ² was used. The core-sheath type composite fiber had a core made of polypropylene, a sheath made of linear low density polyethylene, a thickness of 2.1 dtex, and was surface-treated with a surfactant. The backsheet, a porous film having a basis weight of 20 g / m ^2, was used as the composite by bonding a polypropylene spunbond nonwoven fabric having a basis weight of 20 g / m ² hot melt 1.5 g / m ^2. The porous film is obtained by uniformly blending 100 parts by weight of a linear low density polyethylene resin having a density of 0.925 g / cm ² with 150 parts by weight of calcium carbonate and an ester compound as a third component, Uniaxially stretched twice. As the absorbent core, a mixture having a total basis weight of 520 g / m ² obtained by uniformly mixing 100 parts by weight of the opened fluff pulp and 100 parts by weight of the superabsorbent polymer in an air stream was used. What was wrapped with m ² tissue paper was used. The basis weights of the fluff pulp and the superabsorbent polymer were 260 g / m ² , respectively.

[Comparative Example 1]
Mixing with a total basis weight of 300 g / m ² obtained by uniformly mixing 200 parts by weight of the spread fluff pulp and 100 parts by weight of the superabsorbent polymer as an absorbent used in the waistband part. Using the body. The obtained mixture was wrapped with a tissue paper having a basis weight of 16 g / m ² to obtain an absorbent. A hot melt adhesive was spray-coated at a basis weight of 5 g / m ² between the mixture and the tissue paper. The basis weight of the entire absorbent body was 382 g / m ² and the thickness was 4.2 mm. Other than that was carried out similarly to Example 1, and obtained the waistband part and the disposable diaper.

[Comparative Example 2]
As an absorbent used in the waistband, 100 parts by weight of the opened fluff pulp and 100 parts by weight of the superabsorbent polymer were uniformly mixed in an air stream to obtain a mixture having a total basis weight of 200 g / m ² . Except this, the waistband part and the disposable diaper were obtained similarly to the comparative example 1. The basis weight of the entire absorbent body was 282 g / m ² and the thickness was 3.5 mm.

[Comparative Example 3]
In Comparative Example 1, Comparative Example 1 except that a liquid-permeable sheet (same as the sheet used on the skin contact side, basis weight 25 g / m ² ) was used instead of the water repellent sheet made of SMMS nonwoven fabric. Similarly, a waistband part and a disposable diaper were obtained. The basis weight of the entire absorber was 291 g / m ² and the thickness was 3.8 mm.

[Performance evaluation]
About the disposable diaper obtained by the Example and the comparative example, the stain | pollution | contamination of a waistband part, the structural stability of the absorber of a waistband part, and the softness | flexibility of a waistband part were evaluated with the following method. The results are shown in Table 1 below.

[Dirty waistband]
200 g of colored physiological saline was evenly absorbed into a diaper (front part) cut in the longitudinal direction 1/2. Red No. 1 was used for coloring. The addition amount was 50 ppm (0.5 g for 10 liters of physiological saline). After the addition of physiological saline, the waist flap was overlaid as shown in FIG. After applying a pressure of 3.43 kPa for 2 minutes, the pressure was released, and the surface of the waist flap part on the non-opposite side was visually observed. Then, Advantech filter paper No. The surface of the waist flap part on the non-facing side was overlapped with 10 sheets of 4A stacked on the filter paper side and pressed under the same conditions as above. And the weight change of the filter paper before and behind pressurization was measured. The weight change of the filter paper was considered as the amount of liquid return from the waist flap, and was evaluated according to the following criteria.
○: There is almost no adhesion of the liquid to the surface of the waist flap part on the non-skin facing side, and the liquid return amount from the waist flap part is 0.2 g or less.
(Triangle | delta): Although there is adhesion of the liquid to the surface of the waist flap part on the skin non-opposing side, the liquid return amount from the waist flap part is 0.2 g or less.
X: Liquid adheres clearly to the surface of the waist flap part on the non-opposite side, and the amount of liquid return from the waist flap part exceeds 0.2 g.

[Structural stability of the absorber in the waistband]
(1) At the time of drying The center part of the 100 * 200 mm absorber was cut | disconnected, and the 100 * 100 mm absorber was obtained. The cut surface was directly below, and vibration was applied 20 times at a speed of once / second with an amplitude of 5 cm. The amount of polymer dropped from the cut surface was measured. The structural stability was evaluated according to the following criteria.
(Circle): The ratio of the superabsorbent polymer which dropped out of the mixed superabsorbent polymer is 10% or less.
Δ: Of the mixed superabsorbent polymer, the amount of the superabsorbent polymer dropped off exceeds 10% and is 25% or less.
X: The amount of the superabsorbent polymer dropped out of the mixed superabsorbent polymer exceeds 25%. (2) 200 g of physiological saline was absorbed almost uniformly on the entire surface of the absorbent body cut to 100 × 200 mm when wet. The absorber was gently lifted, and it was visually determined whether the absorber did not break.

[Flexibility of the waistband]
The flexibility was evaluated using the handle-ometer described above. Flexibility was evaluated according to the following criteria.
○: The measured value of the handle-o-meter is 2N or less.
(Triangle | delta): The measured value of a handle ohm meter exceeds 2N and is 4N or less.
X: The measured value of the handle o meter exceeds 4N.

  As is clear from the results shown in Table 1, the disposable diaper of the example (product of the present invention) does not have a dirty waistband part, and the absorbent body of the waistband part is stable both when dry and when wet. In addition, it can be seen that the waistband portion is flexible.

It is a top view which shows the state which expanded one Embodiment of the disposable diaper of this invention planarly. It is a figure which shows the state in the middle of mounting | wearing with the disposable diaper of FIG. It is a figure which shows the state which mounted | wore the disposable diaper of FIG. It is the IV-IV sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 5 Waist part 6 Leg part 7 Solid guard 10 Waist band part 11 Band fastening part 12 Stretch area 15 Liquid permeable sheet 16 Impervious or water repellent sheet 17 Absorber 20 Diaper Fastening A A 1st Area B 2nd Area C Inseam Area

Claims (3)

A crotch region, a first region located on one end side thereof, a second region located on the other end side, and a waistband portion extending laterally from both side edges of the first region; A disposable diaper that is adapted to be joined to each other on a wearer's ventral side or dorsal side, and to be worn with the second section joined to both joined waistbands;
At least one waistband portion is disposed between the two sheets, a liquid-permeable sheet disposed on the wearer's skin side, a liquid-impervious or water-repellent sheet disposed on the side far from the wearer's skin, and and a suction absorbent body was,
The absorbent body is configured by wrapping a web in which a superabsorbent polymer is embedded and supported in hydrophilic long fibers with tissue paper,
The web having hydrophilic long fibers is oriented in the longitudinal direction of the waistband part,
The hydrophilic long fiber is crimped,
The waistband is a disposable diaper whose flexibility is 2N or less as measured by a handleometer. Impermeable or disposable diaper according to claim 1, wherein the water repellent sheet has a water vapor permeability. A crotch region, a first region located on one end side thereof, a second region located on the other end side, and a waistband portion extending laterally from both side edges of the first region; A diaper cover that is adapted to be joined to each other on a wearer's ventral side or dorsal side, and to be worn with the second region joined to both joined waistbands,
At least one waistband portion is disposed between the two sheets, a liquid-permeable sheet disposed on the wearer's skin side, a liquid-impervious or water-repellent sheet disposed on the side far from the wearer's skin, and and a suction absorbent body was,
The absorbent body is configured by wrapping a web in which a superabsorbent polymer is embedded and supported in hydrophilic long fibers with tissue paper,
The web having hydrophilic long fibers is oriented in the longitudinal direction of the waistband part,
The hydrophilic long fiber is crimped,
The waistband is a diaper cover whose flexibility is 2N or less as measured by a handle-ometer.