JP4964445B2 - Absorbent articles - Google Patents

Description

  The present invention relates to a disposable diaper and an absorbent pad, and more particularly, to an absorbent article with improved soft stool absorption retention performance.

In this type of absorbent article, it is necessary to consider excretion of stool and soft stool in addition to urine.
For stools and soft stools by adults in addition to infants (hereinafter also referred to as “feces”), disposal of the absorbent articles is a major problem. For example, when a caregiver in a hospital disposes an absorbent article as garbage, it is necessary to dispose the toilet in a waste container after removing it with a spatula or tissue paper.
This work is not only a burden on the caregiver but also a mental burden because it is not hygienic.
Patent Document 1 discloses a configuration in which an opening is formed in a top sheet and stool is accommodated.
However, it cannot be said that it is sufficient to eliminate the burden of throwing away toilets into a toilet bowl.
JP 2002-113043 A

  Then, the main subject of this invention is providing the absorptive article which can remove feces easily and hygienically.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A top sheet facing the skin and transmitting excretory fluid, an absorbent element that is on the back side of the top sheet and holding the excretory fluid, and a permeable sheet provided between the top sheet and the absorbent element With
The top sheet is made of a non-woven fabric or a plastic sheet, and is an effective opening of a single permeation hole in the excretion liquid permeation hole group formed in the excretion area including at least a part facing the excretion part of the excretion liquid and its periphery. It consists of a perforated sheet having an area of 3 to 75 mm ² and an opening area ratio of 30 to 80%,
In a region beyond the product excretion site from at least one end with respect to the front-rear direction of the topsheet, substantially all of the topsheet is bonded to only the permeable sheet facing the topsheet. Partially fused and bonded at
While the surface sheet is picked and peeled from the transmission sheet, the fusion-bonded portion is unbonded, and at the separation portion, the solid content on the surface sheet via the transmission hole and the transmission sheet An absorbent article having a structure in which adhesion is removed and the solid content on the topsheet is easily removed from the topsheet.

(Function and effect)
In the present invention, the top sheet is partially fusion-bonded at a large number of joints only to the transmission sheet facing the top sheet. In the case of partial fusion bonding, the bonding strength is low, and the bonding of the fusion bonded portion can be released by the peeling operation from the transmission sheet by picking the surface sheet. As a result, when there is excretion of toilet on the top sheet, if the top sheet is picked and peeled from the transmission sheet and the top sheet is turned upside down, the toilet on the top sheet is removed. It can be easily dropped into the top and the disposal operation is simplified.
In relation to this, even if the entire absorbent article is turned upside down, the toilet is not simply attached to the top sheet, but a part of the toilet also penetrates into the lower sheet. , where in many cases to enhance the adhesion of the bottles as a whole, according to the present invention, by peeling from the transparent sheet picking topsheet, expired edges of the transparent sheet of the bottles (adhesion Therefore, the stool on the top sheet can be easily dropped off.

<Invention of Claim 2>
Comprising a back sheet constituting the back side of the absorbent article,
Each side has a barrier cuff standing on the wearer's side,
The outer part of the barrier cuff is fixed to an extending part extending laterally from the absorbent element in the back sheet by a hot melt adhesive or the like, and the side part of the top sheet is fixed to the barrier cuff. Located on the center side in the width direction than the portion fixed to the back sheet, the front and rear end portions of the barrier cuff are joined on the side portion of the top sheet by a hot melt adhesive,
Substantially the entire surface sheet is partially fused and bonded to the transmission sheet of the product facing the surface sheet at a number of bonding points;
2. The absorbent article according to claim 1, wherein the top sheet is fixed only at a joint portion by the hot melt adhesive and a fusion joint portion at front and rear end portions of the barrier cuff .

(Function and effect)
It is well known that barrier cuffs exhibit the effect of preventing toilet side leakage. This configuration is also adopted in this embodiment. In order for the barrier cuff to stand up at least in the region around the leg, the front and rear ends of the barrier cuff must be fixed to the product. Therefore, according to the second aspect of the present invention, the front and rear end portions of the barrier cuff are joined to the top sheet by a hot melt adhesive so that the barrier cuff is raised in the leg circumference region.
However, substantially the entire surface sheet is partially fused and bonded to the transmission sheet facing the surface sheet at a number of bonding points, and the surface sheet is bonded and bonded by a hot melt adhesive. if I only fixed in part, by peeling from the transparent sheet picking topsheet, the cut edges of the transparent sheet of bottles (remove the attachment) that is, easily bottles on the topsheet Can be dropped.
As described above, it is possible to simplify the dropping of the toilet even under the aspect in which the front and rear ends of the barrier cuff are fixed to the product.

<Invention of Claim 3>
The absorbent article according to claim 1 or 2, wherein the topsheet has a tear strength in the front-rear direction defined by JIS P 8116 of 13 N or less.

(Function and effect)
If the tear strength of the topsheet in the front-rear direction is small, it can be easily peeled off from the permeable sheet while tearing the topsheet, and if necessary, the toilet sheets can be removed in a mode in which almost the whole topsheet is separated from the absorbent article. be able to.

<Invention of Claim 4>
The absorbent article according to any one of claims 1 to 3, wherein a bonding strength of the fusion bonded portion is 150 g / 50 mm or less.

(Function and effect)
When the bonding strength is the above, the surface sheet can be easily peeled from the transmission sheet. Note that the bonding strength of the present invention is a surface that has been fusion bonded in accordance with the “10.5 Measurement of 180-degree peeling adhesive strength” test of “10. Adhesive strength” defined in JIS Z 0237. A sheet and a transparent sheet are cut into a 50 mm × 25 mm square, and the end of one of the sheets is sandwiched between the upper chuck and the end of the other sheet is sandwiched between the lower chuck and pulled at a speed of 300 mm ± 30 mm / min. It is the tensile strength.

<Invention of Claim 5>
The absorbent article according to claim 2, wherein the bonding strength of the intermediate region is lower than the bonding strength of the end portion in the front-rear direction in the bonding strength of the fusion bonded portion.

(Function and effect)
The front and rear end portions of the surface sheet tend to be separated from the transmission sheet, while the intermediate region only needs to be joined to such an extent that no slackening due to floating occurs. Therefore, in the bonding strength of the fusion bonded portion, the bonding strength of the intermediate region can be smaller than the bonding strength of the end portion in the front-rear direction.

  As described above, according to the present invention, in short, stool can be easily and hygienically removed.

  Hereinafter, the embodiment of the present invention will be described in detail with an example of a disposable absorbent pad applied to the use surface of an adult pant-type diaper. The absorbent article of the present invention may be used for adults and infants. Needless to say, the present invention can be applied to various absorbent articles such as pants-type diapers themselves and tape-type diapers.

<Basic form>
The absorbent pad shown in FIG. 1 and FIG. 2 permeates excretory fluid and has a surface sheet 1 that opposes the skin made of a perforated sheet, a permeation sheet 2 that permeates excretory fluid, and a back surface side of the permeation sheet. Then, an absorbent element 3 including a cotton-like pulp layer holding the excretory fluid is provided in order from the front surface side to the back surface side. Further, on both sides of the product, there are barrier cuffs B and B standing on the wearer side.

  In the excretion area including at least a portion facing the excretion portion of excretion liquid and the periphery of the excretion excretion portion of the top sheet 1 made of, for example, a non-woven fabric, in the embodiment, a large number of excretion liquid permeation holes H, H. Is formed.

As the transmission holes H, H... Group, the effective opening area of a single transmission hole is 3 to 75 mm ² (more preferably 5 to 30 mm ² ), and the opening area ratio is 30 to 80% (more preferably). 30 to 60%) is used. If the open area and the open area ratio are small, the permeability of soft stool solids will be inferior. If the open area is excessively large, the soft stool solids remaining on the surface of the permeable sheet will come into contact with the skin, causing skin irritation and A complicated skin wiping work is required. If the opening area ratio is excessively large, the strength becomes small, which is not preferable.

  The transmission sheet 2 that directly faces the top sheet 1 functions as a second sheet in the illustrated example. Details thereof will be described later.

  The absorbent element 3 that directly faces the permeable sheet 2 and retains the excretory liquid has a cotton-like pulp layer 3A exposed on the use surface side. In the specific example of FIG. 2, the absorbent element 3 is configured by wrapping the back and side surfaces of the cotton-like pulp layer 3 </ b> A with forehead-wrapped tissue paper or crepe paper 3 </ b> B.

  The back sheet 4 constituting the back side of the absorbent article is a liquid-impervious sheet in the embodiment, and is made of, for example, a plastic sheet. The back sheet 4 may have air permeability. The back sheet 4 extends outward from the side edge of the absorbent element 3.

  A barrier sheet 5 is provided on the side portion of the product, and an outer side portion thereof is fixed to an extension portion of the back sheet 4 by a hot melt adhesive or the like (a joining portion of the barrier cuff base portion is indicated by a symbol F0) The free cuffs are folded back inward, and elastic elastic members 5a such as thread rubber are fixed under the extension to form the barrier cuffs B and B where the free parts stand when worn. ing. In the present invention, the presence or absence of a barrier cuff is not limited, but it is desirable to provide a barrier cuff to prevent side leakage of soft stool.

  In the embodiment, the transmissive sheet 2 extends outward from the side edge of the absorbent element 3, and the extending portion is interposed between the barrier sheet 5 and the back sheet 4 by a hot melt adhesive or the like. It is fixed.

  As shown in FIG. 2, the topsheet 1 is not in a fixed relationship with the backsheet 4, and the barrier sheet 5 is not in a fixed relationship with the barrier sheet 5 except for the four corners. The top sheet 1 needs to be fixed to a product member in some form. In the embodiment, the top sheet 1 is partially joined to the transmission sheet 2. In this joining, the surface sheet 1 is usually joined to the transmission sheet 2 by spiral application of a hot melt adhesive. However, under a preferred embodiment of the present invention, the top sheet 1 is a perforated sheet and has a large opening. As a result, the hot melt adhesive protrudes from the permeation hole to the use surface side, and the presence of the hot melt adhesive hinders the permeation liquid from passing through the permeation hole H, so that the topsheet 1 does not sag ( If the fixing points are largely dispersed, the surface sheet 1 may be loosened and the distance between them may cause the excretion fluid to be transferred to the permeation sheet 2 in a range that is not smooth). In order to reduce the total fixed area as much as possible and to prevent the hot melt adhesive from protruding from the permeation hole to the use surface side, the surface sheet 1 is partially formed by heat sealing or ultrasonic sealing. It is desirable to join the transmission sheet 2 with the fusion joint part m.

  On the other hand, in order to raise the middle part of the barrier cuff B except for the front and rear end parts, the inner front and rear end parts of the barrier sheet 5 are fixed to the top sheet 1 by a hot melt adhesive at a total of four portions ( The hot melt adhesive joint is indicated by symbol F).

  Further, between the outer part of the barrier sheet 5 and the back sheet 4, the elastic elastic member 5 a is stretched along the periphery of the leg, and is fixed by the joint part F 0 of the barrier cuff base part by the hot melt adhesive described above. Thus, the fit around the leg of the article is improved.

  Under a preferred embodiment of the present invention, the front-rear tear strength defined in JIS P 8116 of the topsheet is 13 N or less. Moreover, the surface sheet 1 uses a nonwoven fabric as a raw material. Examples of materials will be described later.

<Joint form of surface sheet to transmission sheet>
On the other hand, it is desirable to fix the topsheet 1 by heat-sealing the permeable sheet 2 as described above. As this fusion method, heat sealing or ultrasonic sealing can be used. The basic principle of these processing methods is the same except for the difference in the heating method, and heating is performed while pressing the convex portions provided on the outer peripheral surface of the processing roll while pressing them on the surface sheet 1, and press-contacting by the convex portions. The part is fused.

  In a preferred embodiment, as shown in FIG. 4, the fusion parts m, m... Are provided at least at one place in the width direction at each position in the front-rear direction of the product. Such a pattern can be achieved by arranging the convex portions of the processing roll so as not to be substantially interrupted in the outer circumferential direction, in other words, by arranging the convex portions so that any one of the convex portions is always fused. .

  The pattern of the fusion parts m, m... Can be determined as appropriate. For example, as shown in FIG. 4, a plurality of fusion parts m, m... Having different positions in the front-rear direction and the width direction are arranged in a V shape. It is possible to form a pattern in which a plurality of fused portions are arranged in the front-rear direction. As the shape of the fused portions m, m..., An appropriate shape such as a round shape, a triangle shape, a square shape, a rhombus shape, a hexagon shape, etc. can be adopted in addition to the illustrated oblique ellipse shape. Can be arranged. In addition, the fusion | melting part m in a figure has shown the shape of the process range, and since the surface sheet 1 has a hole, it may not become equal to the shape of the junction part actually melt | fused.

  Also, whether the front end part FE and rear end part BE of the article and the intermediate part C between them have the same area ratio of the fused parts m, m... (Ratio of the area of all fused parts per unit area). Alternatively, the latter can be increased, but the fusion part, m... Is difficult to permeate the excretory fluid, so that the area ratio of the fusion part m, m. It is preferable to lower the intermediate portion C between the front and rear end portions FE and BE of the article. The area ratio of the fusion parts m, m... Can be adjusted by reducing the number of fusion parts m, m... As shown in the example, and also by reducing the area per one fusion part m. Can be adjusted. The lengths of the front and rear end portions FE and BE and the intermediate portion C of the article can be determined as appropriate. For example, the range of 1 to 100 mm from the front and rear ends is set as the front and rear end portions FE and BE, respectively. The intermediate portion C can be used.

Area in the range of 1 to 300 mm ² per fused portion m one place, in particular it is desirable that in the range of 5 to 30 mm ^2, and the area ratio 0.1 to 20%, especially 0.5 to 10 It is desirable to be within the range of%. When the area ratio of the fusion parts m, m... In the front-rear direction intermediate part C is made lower than the front-rear end parts FE, BE, the area ratio in the front-rear end parts FE, BE is 5-30%, especially 5-20%. It is desirable that the area ratio in the intermediate portion C is 1 to 30%, particularly 1 to 15%.

  When the topsheet 1 is a perforated sheet, the MD direction (product longitudinal direction) length and the CD direction (product width direction) length of the fused portions m, m. It is preferable to select a size or the like so as to be longer than H. As a result, as shown in FIG. 5, even if the position of the fusion part m, m... And the position of the transmission hole H partially overlap each other, the fusion part m, m. .

<Facility dropout mode>
When there is excretion of stool when the absorbent article is worn, for example, the following disposal form can be adopted. This discarding form is merely an example.
(1) One end of the top sheet 1 is picked and peeled off from the transmission sheet 2. At that time, if the topsheet 1 is a material that can be easily torn, it can be torn in the front-rear direction (vertical direction in FIG. 1), avoiding the hot melt adhesive joint F, and thereafter the fused portion m, Since it is joined to the transmission sheet 2 only at m..., it can be easily peeled off from the transmission sheet 2.
After peeling, for example, as shown in FIG. 6, the surface sheet 1 can be turned upside down, and the attached toilet stool X can be dropped into the toilet, for example. Normally, tools such as spatula and tissue paper are not necessary for the removal operation.
If necessary, the entire topsheet 1 may be separated.
(2) When the surface sheet is not torn, an appropriate portion of the surface sheet 1 is picked and peeled off from the transmissive sheet 2 with the hot melt adhesive bonding portion F being bonded. Thereafter, the attached toilet articles X can be dropped into the toilet bowl, for example, by turning the entire absorbent article upside down.

<About other joining forms of the surface sheet>
In the present invention, in the above example, the surface sheet 1 has a structure that can be peeled from the permeable sheet 2 as a whole, but the excretory part of the toilet is substantially in the middle in the longitudinal direction, so that the region beyond the excretion part In this case, it is only necessary that the surface sheet 1 can be peeled from the transmissive sheet 2, and therefore, the bonding mode of the surface sheet 1 to the transmissive sheet 2 is not limited in other regions.
Moreover, when adopting said disposal form (2), it replaces with the form joined by the four fixed parts F so that it may be guessed, and the whole edge part of the surface sheet 1 is made into the permeable sheet 2, for example, hot-melt. It may be fixed by an adhesive.

<About absorption of soft stool>
In an absorbent article whose main purpose is absorption of soft stool, the soft stool transmission rate S1 of the top sheet is larger than the soft stool transmission rate S2 of the transmission sheet. Under a more preferred embodiment, the soft stool permeation rate S2 is larger than the soft stool permeation rate S3 of the surface layer (for example, a cotton-like pulp layer) of the absorbent element, and eventually, S1>S2> S3.

  In this kind of absorbent article, it is necessary that the soft stool is quickly separated from the skin and has a high ability to be housed and held at a position far from the skin. In order to achieve this, each component not only has a high stool permeation rate, but also requires a velocity gradient as described above for the stool permeation rate between components, and the velocity gradient is greater than the absolute value of the velocity. Was found to be dominant.

Furthermore, it is important that the soft stool is quickly transferred to the permeable sheet through the surface sheet, and for this purpose, the surface sheet is a perforated sheet, and in particular, a portion of the perforated surface sheet that faces at least the excretion portion of the excretory fluid. And a group of permeation holes for excretion liquid formed in the excretion region including the periphery thereof, the effective opening area of the single permeation hole is 3 to 75 mm ² and the opening area ratio is 10 to 80%. I found out. Once the soft stool is quickly permeated through the surface sheet and transferred to the permeable sheet, there is a relationship of S1> S2, and thereafter, it is difficult to return to the surface side.

  In this case, if the excretory fluid cannot be transferred to the absorbing element promptly, it will eventually remain in the permeable sheet. When an absorbent body mainly composed of cotton-like pulp is used, it is usually encased with tissue paper to maintain the shape. However, unlike urine, the stool fluid is more viscous and poorly permeable. If the surface of the absorber is such that the liquid content of soft stool is difficult to permeate, it becomes a barrier against the liquid content of soft stool that tends to migrate from the permeable sheet, and eventually the soft stool is difficult to permeate the permeable sheet.

  In this case, since the absorption retention performance of the soft stool is not sufficient, a cotton-like pulp layer on the use surface side is provided below the permeable sheet without interposing another sheet between the permeable sheet and the absorbent element. By directly exposing the liquid, the excretory liquid transferred into the permeation sheet can be quickly transferred to the cotton-like pulp layer, and thus the tendency of the excretion liquid to remain in the permeation sheet can be prevented. The absorption retention performance of soft stool is high.

  On the other hand, a surface layer sheet excellent in soft stool permeability can also be used as the surface layer of the absorbent element. This surface layer sheet can be arranged on the cotton-like pulp layer.

  If the permeable sheet is hydrophilic, it is excellent in permeability in the case of urine, but in the case of excreted liquid that has reached the permeable sheet, for example in the case of loose stool, the solid content of loose stool is retained between the fibers. Thus, the liquid content in the soft stool or the solid content is also retained, and eventually the liquid content in the soft stool is also retained / residual in the permeable sheet, and it is difficult to move to the absorbent element side.

  On the other hand, when a sheet mainly composed of water-repellent or hydrophobic fibers is used as the permeable sheet, even if a lot of soft stool solids are retained between the fibers, the permeable sheet is repellent to liquids in the soft stool or solids. It is considered that the water-based or hydrophobic fibers have a function of exhibiting filterability, so that the liquid component is separated from the solid content and moves to the absorbent element side. As a result, the permeation sheet subsequently shows a margin for receiving loose stool, and since these continuous filtration functions are exerted, the liquid content of loose stool can be transferred to the absorbent element side quickly.

<Other embodiments>
Subsequently, various other embodiments will be described. FIG. 7 shows a cotton-like pulp layer having a narrow upper cotton-like pulp layer 3A1 and a wide lower cotton-like pulp layer 3A2 instead of the single-layered cotton-like pulp layer 3A.

  Superabsorbent polymer particles (SAP) can be provided at appropriate positions of the absorbent element 3 at appropriate positions below the permeable sheet 2 in order to retain a large amount of liquid. For example, in addition to being dispersed and dispersed on the absorber 3A, it can also be dispersed in the absorber 3A. Moreover, as shown in FIG. 8, when it is set as the two-layer structure of upper cotton-like pulp layer 3A1 and lower cotton-like pulp layer 3A2, superabsorbent polymer particles can be included only in lower cotton-like pulp layer 3A2. . The circles in FIG. 4 are superabsorbent polymer particles.

  In the present invention, as long as a topsheet, a permeable sheet, and an absorbent element are provided in this order, the backsheet is wound up to both sides on the topsheet with a frame winding in a form that wraps these side surfaces, and the permeable sheet is an absorbent element The form which wraps the whole, the form which a surface sheet wraps the whole permeable sheet and an absorption element, the form which a permeable sheet wraps the whole absorption element, and a surface sheet wraps the permeable sheet and the whole absorption element further from the top etc. can be taken.

  Further, as shown in FIG. 9, a surface layer sheet 3 </ b> C may be provided on the upper side of the absorbent element 3.

<About constituent materials>
The material of the top sheet 1 is preferably a non-woven fabric in order to improve the skin feel, but may be a plastic sheet. As the opening shape of the hole H, an appropriate shape such as an elliptical shape, a round shape, a triangular shape, a quadrangular shape, a rhombus shape, and a hexagonal shape whose major axis is along the longitudinal direction can be adopted in addition to the illustrated circular shape. A large number can be arranged regularly or irregularly over a part or the whole. As a nonwoven fabric suitable for the surface sheet 1, an air through nonwoven fabric, a resin bond nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a heat roll nonwoven fabric, a spunbond nonwoven fabric and the like can be exemplified. When using a nonwoven fabric for the surface sheet 1, the fineness of the fibers constituting the nonwoven fabric is 2 to 15 dtex, particularly 3 to 10 dtex, especially 4 to 10 dtex, from the point of maintaining a space for absorbing soft stool and increasing permeability. preferable. Moreover, as the fabric weight, 5-45 g / m < ² > is desirable. Furthermore, the topsheet 1 preferably uses water-repellent or hydrophobic fibers in order to suppress diffusion on the topsheet 1.

  The permeable sheet 2 that directly faces the top sheet 1 functions as a layer that quickly transfers the excretory fluid that has passed through the top sheet 2 to the absorbent element 3. The permeable sheet 2 is preferably a sheet mainly composed of water-repellent or hydrophobic fibers, and a non-woven sheet such as an air-through non-woven fabric can also be used. It is desirable that the sheet is opened to form a sheet, in particular, the filament is oriented in the surface direction of the sheet, and further the filament is spirally crimped.

  When a hydrophilic tow such as acetate is opened to form a sheet, the permeability of soft stool is poor. The water-repellent or hydrophobic fibers are excellent in the permeability of soft stool liquid, but, for example, in the case of PET air-through nonwoven fabric, the permeability of the soft stool liquid is not sufficient. On the other hand, for example, when a sheet formed by opening a water-repellent or hydrophobic fiber tow is used as a permeable sheet, the stool liquid content is remarkably excellent.

  When the filaments of the transmissive sheet 2 are oriented in the plane direction of the sheet, they are oriented in the front-rear direction of the product as shown in FIG. 10A, and in the width direction of the product as shown in FIG. In a direction perpendicular to the direction). Orientation in the longitudinal direction of the product has a greater effect of allowing the stool liquid component to permeate and diffuse.

  Examples of water-repellent or hydrophobic filaments that can be suitably used include filaments of PET, PP, PE, and the like, as well as core-sheath filaments made of these.

  The fineness of the filament can be, for example, 1 to 16 denier, preferably 1 to 10 denier, and more preferably about 2 to 8 denier. The filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent body can be produced, and a tow with high unity can be easily produced by entanglement between the fibers. In particular, spiral crimped fibers are optimal. The cross-sectional shape of the tow constituent fibers (filaments) is not particularly limited, and may be any of circular, elliptical, irregular shapes (for example, Y-shaped, X-shaped, I-shaped, R-shaped, etc.) and hollow shapes. It may be. The filament is, for example, in the form of a tow (fiber bundle or filament bundle) formed by bundling about 3,000 to 1,000,000, preferably about 5,000 to 1,000,000 single fibers. Can be used. The tow is preferably constructed by concentrating about 3,000 to 1,000,000 filaments.

  Since the entanglement between fibers is weak, a binder having an action of adhering or fusing the contact portions of the fibers can be used mainly for the purpose of maintaining the shape. Various resin adhesives, particularly thermoplastic resins can be used.

The aggregate of filaments can be produced by a known method. As described above, this representative example is a form in which filaments are converged to form a tow, and this tow is opened. The opening width of the tow is arbitrary, and can be, for example, about 100 to 2000 mm, preferably about 150 to 1500 mm. By adjusting the degree of tow opening, the density of the filament aggregate can be adjusted. The filament assembly, fiber density at the time of a thickness of 10mm is 0.0075 g / cm ³ or less, it is suitable as a particularly 0.0060~0.0070g / cm ^3. If the fiber density is excessively high, the advantage of using a fiber assembly made of tow is reduced, and the liquid permeability of soft stool is lowered. Further, the basis weight of the transmissive sheet 2 of the present invention is desirably 10 to 100 g / m ² . The basis weight of the transmissive sheet 2 can be adjusted by selecting a tow serving as a raw fabric or manufacturing conditions thereof.

  Tow opening methods include, for example, a method in which tow is spread over a plurality of opening rolls, and the tow width is gradually expanded as the tow progresses, and the tow tension (elongation) and relaxation (shrinkage). And the like, and a method of widening and opening using compressed air can be used.

The transmission sheet 2 is preferably a single sheet structure, but if necessary, it may be a laminated structure and regarded as a substantially single sheet. As the lower layer sheet in this case, an as-through nonwoven fabric, a resin-bonded nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a heat roll nonwoven fabric, a spunbond nonwoven fabric and the like can be used, and an air-through nonwoven fabric is most suitable. Among air-through nonwoven fabrics, it is particularly desirable to use water-repellent or hydrophobic fibers. Examples of the water-repellent or hydrophobic fiber include fibers such as PET, PP, and PE, and fibers having a core-sheath structure using these as materials. As the lower layer sheet, a perforated sheet can be used. In this case, it is desirable from the viewpoint of liquid permeability that the effective opening area of a single transmission hole is 0.5 to 40 mm ² and the opening area ratio is 1 to 80%.

It is desirable that the basis weight of the transmissive sheet 2 regarded as a single or substantially single sheet is 10 to 60 g / m ² .

  The absorbent element 3 that directly faces the permeable sheet 2 can be disposed with the cotton-like pulp layer facing the permeable sheet 2 directly.

  As the cotton-like pulp layer, a known cotton-like pulp can be used, and it can be produced by stacking pulp fibers by a known method and entanglement treatment with air or water flow. Pulp fibers can be made of cellulose fibers such as chemical pulp and dissolved pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. Softwood pulp with a long fiber length is better than hardwood pulp. It is preferably used in terms of function and price.

  For example, the superabsorbent polymer particles (SAP) that can be used in the above-described form for the absorbent element 3 are (carboxymethyl cellulose, polyacrylic acid and salts thereof, crosslinked acrylate polymer, starch-acrylic acid graft copolymer). Polymer, starch-acrylonitrile graft copolymer hydrolyzate, polyoxyethylene cross-linked product, carboxymethylcellulose cross-linked product, polyethylene oxide, polyacrylamide etc., partially cross-linked blister polymer, or isobutylene and maleic acid A copolymer of the above is preferably used. What added the blocking inhibitor in order to suppress the blocking property by moisture absorption of a product can also be used. In addition, the superabsorbent polymer has various forms such as powder, particles, granules, pellets, sol, suspension, gel, film, and nonwoven fabric. Any of them can be used in the present invention, and a particulate material is particularly preferably used.

The basis weight of the superabsorbent polymer can be appropriately determined according to the amount of absorption required corresponding to the amount of excretory fluid. Thus can not be said sweepingly, typically 0.03 g / cm ² or less, particularly preferably be a 0.01~0.025g / cm ^2.

  Further, instead of containing a superabsorbent polymer in the cotton-like pulp layer 3A1 and the cotton-like pulp layer 3A2, the cotton-like pulp layer 3A1 and the cotton-like pulp layer 3A2 have high absorption on at least one of the front side and the back side. The functional polymer can also be provided in a layer form. In these cases, the superabsorbent polymer can be adhered to the packaging materials 3A and 3C enclosing the cotton-like pulp layer 3A1 and the cotton-like pulp layer 3A2 with an adhesive. As the adhesive in this case, the aforementioned thermoplastic resin can be used.

  The back sheet 4 constituting the back side of the absorbent article is a liquid-impervious sheet in the embodiment, and for example, a plastic sheet can be used. The back sheet 4 may have air permeability.

  As the absorbent element 3 that directly faces the permeable sheet 2, the surface layer sheet 3 </ b> C may be disposed as shown in FIG. 9 in addition to the permeable sheet 2 facing the cotton-like pulp layer directly.

  As the surface layer sheet 3C in this case, an air-through nonwoven fabric, a resin-bonded nonwoven fabric, an airlaid nonwoven fabric, a spunlace nonwoven fabric, a heat roll nonwoven fabric, a spunbonded nonwoven fabric, or the like can be used. Among air-through nonwoven fabrics, it is particularly desirable to use water-repellent or hydrophobic fibers. Examples of the water-repellent or hydrophobic fiber include fibers such as PET, PP, and PE, and fibers having a core-sheath structure using these as materials.

The basis weight of the surface layer sheet 3C is desirably 10 to 60 g / m ² . In addition to a single layer, the surface layer sheet 3C can be laminated in two or more layers, for example, in a three-layer structure. When laminated, the basis weight in the laminated state is desirably 10 to 60 g / m ² .

The surface layer sheet 3C can be a perforated sheet. In this case, it is desirable from the viewpoint of liquid permeability that the effective opening area of a single transmission hole is 0.5 to 40 mm ² and the opening area ratio is 1 to 80%. In the case of a perforated sheet, in addition to perforating various nonwoven fabrics, a plastic sheet may be perforated.

It is a top view in the development state of the example of an absorptive article concerning the present invention. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. It is explanatory drawing which shows the joining form to the permeation | transmission sheet | seat of a surface sheet. It is explanatory drawing of the example of a relationship between the perforation hole of a surface sheet, and a melt | fusion part. It is explanatory drawing of the processing form illustration of a toilet. It is sectional drawing of another form. It is sectional drawing of another form. It is sectional drawing of another form. It is a top view in the development state of an absorptive article for explaining the orientation form of the filament which constitutes a permeable sheet.

  DESCRIPTION OF SYMBOLS 1 ... Surface sheet, H ... Hole of surface sheet, 2 ... Transmission sheet, 3 ... Absorbing element, 4 ... Back surface sheet, 5 ... Barrier sheet, B ... Barrier cuff.

Claims (5)

A top sheet facing the skin and transmitting excretory fluid, an absorbent element that is on the back side of the top sheet and holding the excretory fluid, and a permeable sheet provided between the top sheet and the absorbent element With
The top sheet is made of a non-woven fabric or a plastic sheet, and is an effective opening of a single permeation hole in the excretion liquid permeation hole group formed in the excretion area including at least a part facing the excretion part of the excretion liquid and its periphery. It consists of a perforated sheet having an area of 3 to 75 mm ² and an opening area ratio of 30 to 80%,
In a region beyond the product excretion site from at least one end with respect to the front-rear direction of the topsheet, substantially all of the topsheet is bonded to only the permeable sheet facing the topsheet. Partially fused and bonded at
While the surface sheet is picked and peeled from the transmission sheet, the fusion-bonded portion is unbonded, and at the separation portion, the solid content on the surface sheet via the transmission hole and the transmission sheet An absorbent article having a structure in which adhesion is removed and the solid content on the topsheet is easily removed from the topsheet. Comprising a back sheet constituting the back side of the absorbent article,
Each side has a barrier cuff standing on the wearer's side,
The outer part of the barrier cuff is fixed to an extending part extending laterally from the absorbent element in the back sheet by a hot melt adhesive or the like, and the side part of the top sheet is fixed to the barrier cuff. Located on the center side in the width direction than the portion fixed to the back sheet, the front and rear end portions of the barrier cuff are joined on the side portion of the top sheet by a hot melt adhesive,
Substantially the entire surface sheet is partially fused and bonded to the transmission sheet of the product facing the surface sheet at a number of bonding points;
2. The absorbent article according to claim 1, wherein the top sheet is fixed only at a joint portion by the hot melt adhesive and a fusion joint portion at front and rear end portions of the barrier cuff.   The absorbent article according to claim 1 or 2, wherein the topsheet has a tear strength in the front-rear direction defined by JIS P 8116 of 13 N or less.   The absorbent article according to any one of claims 1 to 3, wherein a bonding strength of the fusion bonded portion is 150 g / 50 mm or less.   The absorbent article according to claim 2, wherein the bonding strength of the intermediate region is lower than the bonding strength of the end portion in the front-rear direction in the bonding strength of the fusion bonded portion.

Images