WO2007049725A1

WO2007049725A1 - Absorbable article

Info

Publication number: WO2007049725A1
Application number: PCT/JP2006/321431
Authority: WO
Inventors: Yumiko Seike; Akinori Fukae; Tomotsugu Matsui
Original assignee: Daio Paper Corporation
Priority date: 2005-10-26
Filing date: 2006-10-26
Publication date: 2007-05-03

Abstract

[PROBLEMS] To improve the shape stability of a filament assembly and increase the fitting properties to the skin of a wearer. [MEANS FOR SOLVING PROBLEMS] In an area where an absorber (56) having an assembly of filaments is placed, a groovy emboss (Em) is formed along approximately a lengthwise direction on at least both sides of a crotch of a wearer. The emboss (Em) extends from a top sheet (30) and reaches the absorber (56).

Description

Specification

Absorbent articles

Technical field

[0001] The present invention relates to an absorbent article in which a groove-like emboss reaching from the top sheet to the absorbent main body is formed, particularly an absorbent formed by a filament aggregate formed by opening a tow. Articles, preferably paper diapers. The present invention also relates to an absorbent article and a method for producing an absorbent body.

Background art

[0002] Absorbent articles such as infant and adult tape-type and pants-type disposable diapers and sanitary napkins include a top sheet on the use surface side, a back sheet that prevents permeation of liquid on the back side, and these The basic element is an absorbent body that is interposed between sheets and receives and holds excreted liquid that has permeated through the top sheet.

[0003] For this basic element, a form that improves the touch when a plastic sheet is used as a knock sheet, for example, by providing an exterior sheet such as non-woven fabric on the back side of the knock sheet, and so-called knocks on both sides of the product. Forms that provide elastic stretch to improve fit around the waist and abdomen, such as forms that form rear cuffs, are appropriately added.

[0004] As the absorbent body that receives and holds the liquid that has passed through the top sheet on the use surface side, conventionally, a laminated fiber of norp short fibers has been generally used. It is also known to use superabsorbent polymer particles (hereinafter also referred to as “SAP”) to increase the amount of absorption in the liquid!

[0005] There is a case where SAP is dispersed when dispersed on a staple fiber of short pulp fibers, and SAP of pulp short fibers is dispersed and held (Patent Document 1).

[0006] On the other hand, in recent years, as shown in JP-T 2002-524399 (W099Z27879: Patent Document 2) and JP-T 2004-500165 (US Pat. No. 6,646,180: Patent Document 3), cellulose It has been proposed to use acetate tow as an absorber. In this absorbent element, the filament constituting the tow extends in the front-rear direction to the front and rear ends of the absorbent element. [0007] Special Table 2004-500165 discloses an absorbent body mainly composed of SAP and filament assembly. This absorber is provided between the upper layer and the lower layer, contains about 50 to 95% by weight of SAP, and contains about 5 to 50% by weight of water-insoluble hydrophilic polymer such as starch and fibers. This is a laminate structure that is folded into a C-shaped cross section and a channel is formed in the center.

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2004-65300

Patent Document 2: Special Table 2000- 524399 (W099 / 27879) Publication

Patent Document 3: Japanese Patent Publication No. 2004-500165 (US Pat. No. 6,646,180)

Disclosure of the invention

Problems to be solved by the invention

[0008] Tow has a relatively high density as it is, and its absorption performance and softness are insufficient.

[0009] Unlike general-purpose cotton-like pulp, the filament aggregate formed by opening the tow while squeezing is weakly linked to each other. Therefore, the shape collapses due to external force applied during use, and the initial absorption performance is reduced. There was a possibility that it could not be demonstrated.

[0010] In particular, when an external force is applied during or after wearing, the filaments tend to be separated from each other, the density in the width direction of the absorbent body is increased, and the wearability of the wearer tends to be poor. It was. The decrease in the fit of the wearer to the skin tends to cause the excreted liquid to stay on the top sheet without quickly penetrating the absorber, and the liquid remaining on the top sheet diffuses the top sheet and It may cause wetting and fogging.

[0011] Also, when the filament aggregate is oriented in the longitudinal direction of the absorbent element (product), it tends to flow excessively (run) in the orientation direction of the absorbed hydraulic filament, and crosses the orientation direction of the filament. In this direction, it is difficult to diffuse, and there is a limit to increasing the overall absorption capacity.

[0012] Further, in an absorbent element using a filament assembly in which hardly absorbable filaments that hardly absorb water themselves, such as cellulose acetate tow, gathered in a bundle, the liquid diffuses along the continuous direction of the filament. If both ends of the easy filament extend to the periphery of the absorbent element, leakage will occur due to the rapid supply of a large amount of liquid to that end. There was.

[0013] Further, conventionally, since the high-absorbent polymer particles are uniformly contained throughout the entire absorbent body, when the high-absorbent polymer particles absorb excretion fluid in the crotch part, the crotch part is uniformly in the width direction. There was a problem of swelling and worsening the wearing feeling. In particular, in order to prevent so-called side leakage from around the legs, many absorbent articles are provided with a noir cuff standing on the use surface side on both sides of the top sheet. If both sides of the crotch part are inflated, the substantial standing height of the Noriya cuff is reduced, and the follow-up performance to the body surface is also reduced by merely reducing the amount of damming.

[0014] Therefore, the first problem of the present invention is to improve the shape stability of the filament aggregate and improve the fit of the wearer to the skin. The second problem is to quickly absorb the liquid into the absorbent body while flowing the liquid along the groove of the emboss. Furthermore, the third problem is to prevent leakage due to excessive supply of liquid to the edge of the absorbing element. Furthermore, the fourth problem is to solve the problem that the crotch portion expands uniformly in the width direction and deteriorates the wearing feeling. Other issues will become clear from the following explanation.

Means for solving the problem

The present invention that has solved the above problems is as follows.

In an absorbent article having a liquid-permeable top sheet, an absorbent main body including an absorbent body formed by a filament aggregate formed by opening a tow, and a liquid-impermeable sheet in this order, [0017] In the region where the absorbent main body is located, groove-shaped embosses that reach the absorber from the top sheet are formed substantially along the longitudinal direction on both sides of the wearer's crotch. Absorbent article.

[0018] (Function and effect)

In the region where the absorbent main body is located, groove-shaped embosses that reach the absorber from the top sheet are formed along the longitudinal direction at least on both sides of the wearer's crotch. The area between the embosses starts to fit in the crotch area of the wearer at the embossed part, and the excreted liquid spreads on the top sheet, causing front and back or side leakage , And quickly penetrates into the absorbent body.

[0019] Further, since the emboss is formed in a form that reaches the absorber, the liquid that has penetrated into the absorber diffuses along the emboss, and as a result, the absorption rate of the entire absorber is improved.

[0020] <Invention of Claim 2>

2. The absorbent article according to claim 1, wherein the emboss is formed along a direction intersecting with an orientation direction of the filament aggregate.

[0021] (Function and effect)

The diffusion rate of the liquid is faster in the orientation direction of the filament aggregate than in the direction intersecting this. However, when the emboss is formed along the direction intersecting the orientation direction of the filament aggregate, the emboss in the intersecting direction functions like a weir and diffuses in the direction intersecting the filament aggregate. And increase the diffusion rate of the absorber as a whole.

Further, the embossing along the direction intersecting the orientation direction of the filament aggregate prevents the filament aggregate from being weakly linked to each other, and in particular, according to the embossing utilizing heat fusion. In addition, the effect of preventing looseness due to high adhesion of the filament assembly is high, and the required absorption capacity is less likely to be deformed by external force applied during use.

The emboss includes at least a first portion formed substantially longitudinally on both sides of the wearer's crotch, and a second portion formed on the front and back portions of the absorbent main body, and the first portion The absorbent article according to claim 1 or 2, wherein the second portion and the second portion are substantially connected to each other, and a substantially annular emboss is formed.

[0024] (Function and effect)

When the first part and the second part are substantially connected to each other and a substantially annular emboss is formed, the effects of claims 1 and 2 are exhibited synergistically, The absorption speed in the embossed region increases and the absorption performance is excellent.

[0025] Further, in order to increase the absorption amount of the liquid, it is preferable to hold the superabsorbent polymer particles in the filament aggregate. Unlike the case of cotton-like pulp, superabsorbent polymer particles When applied to an iramentum assembly, during the subsequent process, or until it is used by a consumer, the filament assembly may move and become unevenly distributed within the filament assembly, or the filament assembly force may be lost. If such a situation occurs, the absorption performance is hindered, and the unevenness of the superabsorbent polymer particles that have lost the filament aggregate strength gives the user a sly discomfort, which is not preferable. However, by forming a circular emboss, the movement of the superabsorbent polymer particles in the filament aggregate can be suppressed, the uneven distribution of the superabsorbent polymer particles is prevented, and the urine diffusibility and the absorption speed are improved. And gel blocking can be prevented.

It has an absorption element that absorbs liquid that has passed through the top sheet on the use surface side,

[0027] The absorbent element has a difficult-to-absorb filament assembly obtained by opening the tow and having an absorption amount of 1.0 times or less of its own weight,

[0028] In the filament assembly, the filament extends along the top sheet, and both ends of the filament are spaced inward from the peripheral edge of the absorbent element.

[0029] An absorbent article characterized by the above.

[0030] (Function and effect)

In the present invention, since both ends of the filament are spaced inward from the peripheral edge of the absorbent element, even if the liquid travels along the filament and diffuses to both ends, the diffusion can be stopped before the peripheral edge of the absorbent element. Therefore, the excessive supply of the liquid to the end portion of the absorbing element is suppressed, and leakage prevention is achieved.

[0031] The absorption amount of the present invention is measured by the following procedure.

(1) Weigh 5. Og of sample fiber and immerse in 1L of artificial urine for 5 minutes.

(2) Next, remove the sample from the artificial urine and suspend it for 1 minute.

(3) Next, use a centrifuge to separate the liquid for 6 minutes at 2250 rpm.

(4) Next, weigh the sample and take the value obtained by subtracting the fiber weight (5. Og) as the absorption.

The absorbent body is attached to a liquid permeable sheet or a liquid permeable sheet. The absorbent article according to claim 4, wherein the absorbent article is wrapped with a sheet.

[0033] (Function and effect)

If such a structure is adopted, it can be easily manufactured using the manufacturing method of the present invention described later.

[0034] <Invention of Claim 6>

At least on both sides of the crotch part, there are formed embossed recesses that extend along the front-rear direction and the middle part in the front-rear direction bulges to the center in the width direction. The absorbent article according to claim 4 or 5, wherein the absorbent article is formed so as to reach the absorber.

[0035] (Function and effect)

In this case, the use surface at the center in the width direction can be raised from both sides, and the fit between the crotch and the crack can be improved.

[0037] The absorbent element has a lower layer absorber and an upper layer absorber provided on the top sheet side,

[0038] The upper-layer absorbent body is obtained by opening the tow and has an absorption capacity of a hard-to-absorb filament that is absorbed by 1.0 times or less of its own weight. The filament aggregate has a filament along the top sheet. And both ends of the filament are spaced inward from the periphery of the lower layer absorber,

[0039] An absorbent article characterized by the above.

[0040] (Function and effect)

In this case, even if the liquid component supplied to the upper absorbent body passes through the upper absorbent body and reaches both ends of the filament, the diffusion of the liquid stops there and does not diffuse to the periphery of the absorbent element. Then, the liquid component diffused in the upper absorbent body moves to the lower absorbent body and is retained. Therefore, the excessive supply of liquid to the end of the absorbing element is suppressed, and leakage can be prevented.

[0041] <Invention of Claim 8> 8. The absorbent article according to claim 7, wherein the upper layer absorbent body is one in which a filament aggregate is attached to a liquid permeable sheet or wrapped with a liquid permeable sheet.

[0042] (Function and effect)

[0043] <Invention of Claim 9>

9. The absorbent article according to claim 7 or 8, wherein the lower layer absorbent is obtained by mixing and stacking pulp fibers and superabsorbent polymer particles.

[0044] (Function and effect)

Since the lower layer absorber plays a role of holding (storing) the absorbed liquid, it is preferable to employ an absorber having an excellent water absorption amount as described in this section.

9. The absorbent article according to claim 7 or 8, wherein the lower layer absorbent is obtained by mixing and collecting filament aggregates and superabsorbent polymer particles.

[0047] The absorbent element has a lower layer absorber and an upper layer absorber provided on the top sheet side,

[0048] The lower layer absorbent body is obtained by opening the tow and has an absorption capacity of a hard-to-absorb filament that is absorbed by 1.0 times or less of its own weight. The filament aggregate has a filament along the top sheet. And both ends of the filament are spaced inward from the periphery of the upper absorbent body,

[0049] An absorbent article characterized by the above.

[0050] <Invention of Claim 12>

At least on both sides of the crotch part, there are formed embossed recesses that extend along the front-rear direction and the middle part in the front-rear direction bulges to the center in the width direction. The absorbent article according to any one of claims 7 to L1, wherein the absorbent article is formed so as to reach the upper-layer absorber. [0051] (Function and effect)

[0052] <Invention of Claim 13>

Filament continuous direction after sticking or wrapping with a liquid-permeable sheet a difficult-to-absorb filament assembly that is obtained by opening the tow and has an absorption amount of 1.0 times or less of its own weight. A method for producing an absorbent body, comprising: cutting the filament assembly at predetermined intervals, and attaching the cut filament assembly to a predetermined position on the absorbent body or the absorbent sheet.

[0053] (Function and effect)

The filament aggregate obtained by opening the tow is a material that is difficult to handle in manufacturing because it is easy to disintegrate or lose its shape. For this reason, in the manufacture of conventional absorbers, the filament aggregates are handled in a continuous state, and the filament aggregates are also cut using cutting into individual absorbers.

[0054] However, in such a manufacturing method, it is impossible to manufacture the absorbent body in which both ends of the filament extend to the peripheral edge of the absorbent element, and it is impossible to avoid the leakage problem as described above. . For this reason, it was desired to develop a manufacturing technique that can arrange the aggregate of filaments at a desired position in the absorbent body.

The invention described in this section has been made in view of such problems. In the present invention, prior to cutting, the continuous filament aggregate is attached to the continuous liquid-permeable sheet or wrapped with the liquid-permeable sheet, so that the filament aggregate is scattered or loses its shape. It becomes difficult to do. For filament assemblies integrated with a sheet, a sheet processing device such as a slip force utter can be used, and the assembly of filaments is desired in the absorbent body without requiring special equipment. It becomes possible to arrange in the position.

[0056] <Invention of Claim 14>

It has an absorption element that receives and holds liquid that has passed through the top sheet on the use surface side,

[0057] The absorbent element includes an absorbent body having an aggregate of filaments opened from tow and superabsorbent polymer particles,

The absorbent body has a crotch portion, a front portion of the crotch portion, and a rear portion of the crotch portion. In addition, the main absorbent portion, which is a portion other than both sides of the crotch portion, has superabsorbent polymer particles, and the basis weight of the superabsorbent polymer particles on both sides of the crotch portion is less than that of the main absorbent portion.

An absorbent article characterized by the above.

[0058] (Function and effect)

In the absorbent body of the present invention, the main absorbent portion, which is a portion other than the both side portions of the crotch portion, has high-absorbent polymer particles. The basis weight of the superabsorbent polymer particles is less than that of the main absorption portion, and when the excretory fluid is absorbed, the expansion at both sides of the crotch portion is suppressed. As a result, both sides of the crotch can be flexibly fitted around the legs when excreted fluid is absorbed.

[0059] <Invention of Claim 15>

15. The absorbent article according to claim 14, wherein the superabsorbent polymer particles are adhered to the filament assembly with an adhesive.

[0060] (Function and effect)

As described above, the present invention is characterized in that the basis weight of the superabsorbent polymer particles is different between both side portions of the crotch portion and other portions. Therefore, if the superabsorbent polymer particles move freely, the effects of the present invention described above may be diminished. Therefore, it is preferable to adhere the superabsorbent polymer particles to the filament assembly as described in this section.

[0061] <Invention of Claim 16>

The absorbent article according to claim 14 or 15, wherein the absorbent element includes a covering sheet that wraps the absorbent body, and the superabsorbent polymer particles are bonded to the covering sheet with an adhesive.

[0062] (Function and effect)

In many absorbent articles, the absorbent body is treated with tissue paper (crepe paper) for the purpose of preventing the filament aggregate from warping or deformation, or enhancing the integrity of the filament aggregate and the superabsorbent polymer particles. In this case, it is preferable to wrap it with a covering sheet such as It is preferable to adhere the superabsorbent polymer particles to the encapsulating sheet as described above to suppress movement.

The absorbent article according to any one of claims 14 to 16, comprising a holding sheet for holding the superabsorbent polymer particles.

[0064] (Function and effect)

As a means for suppressing the movement of the superabsorbent polymer, a holding sheet as described in this section can be adopted in addition to the above-mentioned adhesion.

[0065] <Invention of Claim 18>

The absorbent article according to claim 17, wherein the superabsorbent polymer particles are adhered to the holding sheet with an adhesive.

[0066] (Function and effect)

When the holding sheet is used, the movement of the superabsorbent polymer particles can be more effectively suppressed by adhering the superabsorbent polymer to the holding sheet.

The absorbent article according to any one of claims 14 to 18, further comprising a holding sheet having holding holes for the superabsorbent polymer particles.

[0068] (Function and effect)

With a holding sheet with such holding holes! / Then, the superabsorbent polymer particles are trapped in the holding holes, and the movement is suppressed. The term “holding hole” means a force that includes at least one of a hollow hole and a through hole, and does not include anything depending on the shape of the sheet itself, such as an interfiber gap in a nonwoven fabric (the same applies hereinafter). .

[0069] <Invention of Claim 20>

The absorbent article according to claim 19, wherein the holding sheet is provided only in a portion overlapping the main absorbent portion.

[0070] (Function and effect)

As described in this section, by arranging the holding sheet with holding holes only in the part that overlaps the main absorbent part, it is possible to efficiently move the superabsorbent polymer particles from the main absorbent part to both sides of the crotch part. It can be well controlled.

The absorptivity according to any one of claims 14 to 18, further comprising a holding sheet having a holding hole for the superabsorbent polymer particles only on a portion overlapping the main absorbent portion on a back surface side of the absorber. Goods.

[0072] (Function and effect)

As described in this section, it is possible to efficiently suppress the movement of the superabsorbent polymer particles to both sides of the crotch part of the main absorbent partial force by providing only the part of the holding sheet that overlaps the main absorbent part.

The absorbent article according to claim 15, 16 or 18, wherein an adhesive for adhering the superabsorbent polymer is disposed only on the main absorbent portion.

[0074] (Function and effect)

When an adhesive is arranged as described in this section, adhesion for adhering superabsorbent polymer particles that can efficiently suppress the migration of the superabsorbent polymer particles from the main absorbent portion to both sides of the crotch portion. Since there is no agent on both sides of the crotch part, the increase in rigidity on both sides of the crotch part can be suppressed, and while the movement of the superabsorbent polymer particles is suppressed by adhesion, the fit at the time of wearing is not bad. Favored ,.

The invention's effect

[0075] As described above, according to the present invention, the liquid along the embossed grooves can improve the shape stability of the absorbent body, particularly the filament aggregate, and can improve the fit of the wearer to the skin. As a result, it is possible to absorb the liquid quickly into the absorbent body while flowing.

[0076] Further, according to the present invention, it is possible to suppress the excessive supply of the liquid to the edge portion of the absorption element, and to provide an advantage such as prevention of leakage.

[0077] Furthermore, according to the present invention, there is an advantage that the crotch portion of the absorbent body expands uniformly in the width direction, and the force S is less likely to be worn.

BEST MODE FOR CARRYING OUT THE INVENTION [0078] The following description is divided into first to third embodiments, but it goes without saying that a part of the configuration of any of the embodiments can be applied to other embodiments within the scope of the present invention. Absent.

[0079] <First embodiment: related to inventions according to claims 1 to 4>

(Pants-type use, example of a disposable diaper)

FIG. 1 shows an example of a pants-type disposable diaper as an absorbent article. The pan-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent body 20, and the absorbent body 20 is fixed to the exterior sheet 12. The absorbent main body 20 is a portion that receives and absorbs and holds liquids such as urine and loose stool (menstrual blood in the case of a sanitary napkin described later). The exterior sheet 12 is a part for attaching to the wearer.

[0080] The exterior sheet 12 has, for example, an hourglass shape as shown in the figure, and both sides are constricted, and this is a part into which the wearer's leg is inserted. The absorbent body 20 can take any shape, but is rectangular in the illustrated form.

[0081] As shown in FIG. 2, the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed at a predetermined position, and both sides of the front body 12F and the back body 12B of the exterior sheet 12 The joining region 12A is joined by heat fusion or the like. Thus, a pants-type disposable diaper having the structure shown in FIG. 1 and having a waist opening WO and a pair of redder openings LO can be obtained.

[0082] An intermediate width in the longitudinal direction of the absorbent main body 20 shown in the drawing (that is, the vertical direction in Fig. 2 and also in the longitudinal direction of the product) is shorter than the width connecting the constricted portions of the exterior sheet 12. ing. This width relationship may be reversed or the same width.

[0083] The exterior sheet 12 is preferably composed of two sheets of water-repellent nonwoven fabric, for example, and an elastic elastic member is interposed between these sheets, and a form that fits the wearer by the contraction force is desirable. As the elastic elastic member, thread rubber or elastic foam band can be used, but it is desirable to use a large number of thread rubbers. In the illustrated form, the rubber threads 12C, 12C,... Are continuously provided in the width direction in the waist region W, provided only on both sides in the waist region U, and provided in the crotch region L. Absent. The rubber thread 1 2C, 12C ... is provided in both the waist region W and the lower waist region U, so that even if the elastic force of the thread rubber 12C itself is weak, the wearer also in the lower waist region U as a whole In As a result, the product fits well to the wearer.

[0084] (absorbent body)

The absorbent main body 20 according to the embodiment has a top sheet 30 having a strength such as a non-woven fabric that allows the liquid to pass therethrough as shown in FIG. 3 showing the state without embossing and FIG. 4 showing the state with the embossing formed. And an intermediate sheet (second sheet) 40 and an absorbent element 50 constituting the main element of liquid absorption. The absorbent element 50 includes an absorbent body 56 that absorbs and holds the received liquid, and a liquid-impermeable sheet (also referred to as a back sheet) 70 such as a plastic sheet is provided on the back side thereof. The exterior sheet 12 is provided on the back side of the liquid-impermeable sheet 70. In addition, there are barrier cuffs 60, 60 on both sides.

[0085] (Top sheet)

The top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, polyolefin fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these Etc. can be illustrated. Sarakuko and non-woven fabric may be manufactured by any processing. Examples of the Karoe method include known methods such as the spunlace method, the spunbond method, the thermal bond method, the melt blown method, the needle punch method, the air through method, and the point bond method. For example, the spun lace method is a preferable cache method when the flexibility and drapeability are required, and the thermal bond method is preferable when the bulkiness and softness are required.

[0086] The top sheet 30 may be a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.

[0087] (Intermediate sheet) In order to quickly transfer the liquid that has permeated through the top sheet 30 to the absorbent body, the permeation speed of the liquid is faster than that of the top sheet 30, and an intermediate sheet 40 that is usually called a “second sheet” can be provided if necessary. This intermediate sheet prevents the “reversal” phenomenon of the absorbed liquid from the absorber by force by transferring the liquid quickly to the absorber and improving the absorption performance by the absorber, and always on the top sheet 30 It can be in a dry state.

[0088] Examples of the intermediate sheet 40 include the same material as the top sheet 30, spun lace, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.

[0089] The intermediate sheet (second sheet) 40 is interposed between the top sheet 30 and the covering sheet 58.

The intermediate sheet 40 in the form shown in the figure is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56, or may be within a short or long range centered on the region for receiving the liquid. A typical material for the intermediate sheet 40 is a nonwoven fabric excellent in liquid permeability.

[0091] (Absorbing element)

The absorbent element 50 includes an absorbent body 56 that absorbs and retains the received liquid, and the absorbent body 56 may be a cotton-like pulp fiber, but in a preferred embodiment, the tow is opened. An enveloping sheet that includes an aggregate of filaments 52, 52 ... (filament aggregate) and superabsorbent polymer particles 54, 54 ... and wraps at least the back and side surfaces of the absorber 56 And 58. Further, a holding sheet 80 is provided between the absorbent body 56 and the rear surface side portion (lower portion) of the covering sheet 58.

[0092] (Absorber)

As described above, the absorbent body 56 has an aggregate of filaments 52, 52. Preferably, as shown in FIG. 3, superabsorbent polymer particles 54, 54. It is desirable that the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of the filaments 52, 52. This state of being dispersed substantially throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG. [0093] If there is no or very little SAP particles in the upper, lower, and intermediate parts of the absorber 56, it cannot be said that "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper, lower, and / or middle portions of the filament aggregate in addition to the form“ uniformly ”distributed in the entire thickness direction. The force is still included in the upper, lower and middle parts. In addition, a form in which some SAP particles remain on the surface of the filament 52, 52 ··· not entering the aggregate of filaments 52, 52 ··· Forms that pass through the body and are on the covering sheet 58 or on the holding sheet 80 are not excluded.

[0094] The aggregate of filaments 52, 52, ... is obtained by opening a tow (fiber bundle) composed of filaments (substantially continuous long fibers). The filament material is not particularly limited as long as it can be heat-sealed. For example, polysaccharides or derivatives thereof (cell mouth, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene) , Polypropylene, polyamide, polyester, polylactaamide, polybutyrate, etc.) Cellulose esters and cellulose are particularly preferred.

[0095] As cellulose, cellulose derived from plants such as cotton, linter, and wood pulp, buttery cellulose, etc. can be used. Regenerated cellulose, which may be regenerated cellulose such as rayon, is spun. Also good.

[0096] Examples of cellulose esters that can be suitably used include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

[0097] The average degree of polymerization of the cellulose ester is, for example, 10 to 1000, preferably 50 to 900. The average substitution degree of the cellulose ester is, for example, about 1 to 3, preferably 1 to 2.15, and more preferably about 1.1 to 2.0. Can do. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

[0098] As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.

[0099] The filament may contain various additives such as a heat stabilizer, a colorant, an oil agent, a yield improver, a whiteness improver, and the like.

[0100] The fineness of the filament is, for example, 1 to 16 dex, preferably 1 to: LOdex, and more preferably 1 to 5 dex. 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, about 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 highly integrated tow can be easily produced by entanglement between the fibers. The cross-sectional shape of the filament is not particularly limited, and may be any of, for example, a circle, an ellipse, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Good. For example, the filament has a shape of a tow (fiber bundle) formed by bundling 3,000 to 1,000,000, preferably <5,000 to 1,000,000 single fibers. Used in. The fiber bundle is preferably formed by concentrating about 3,000 to 1,000,000 filaments.

[0101] Since the tow has weak entanglement between filaments, a binder having an action of adhering or fusing the contact portion of the filament can be used mainly for the purpose of maintaining the shape. Binders include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various grease adhesives, especially heat Plastic resin can be used. Triacetin can be particularly preferably used. [0102] The thermoplastic resin used as the binder is a resin that exhibits an adhesive force when melted and solidified, and includes water-insoluble or poorly water-soluble resin and water-soluble resin. Water-insoluble or poorly water-soluble rosin and water-soluble rosin can be used in combination as necessary.

[0103] Examples of water-insoluble or poorly water-soluble resins include olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, polybutyl acetate, and polymethacrylic acid. Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene 榭脂, petroleum 榭脂), such as hydrogen added hydrocarbon 榭脂 can be used. These thermoplastic rosins can be used singly or in combination.

[0104] The water-soluble rosin has various water-soluble polymers such as polybulal alcohol, polypyrrole pyrrolidone, polybull ether, bulll monomer, carboxyl group, sulfonic acid group or a salt thereof. Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble coagulants can be used alone or in combination of two or more.

[0105] Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.

[0106] Since tow can be produced by a known method, it will not be described in detail. Cellulose diacetate tow bale that can be suitably used for the absorbent element 50 is commercially available from Cera-Izu Co., Ltd. Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 gZcm ³ and a total weight of 400-600 kg.

[0107] From this bale, the tow is peeled off and opened in a wide band shape so as to have a desired size and bulk. The opening width of the tow is arbitrary, for example, a width of 100 to 2000 mm, preferably a product suction The width of the collector can be about 100 to 300 mm. Further, the density of the absorbent can be adjusted by adjusting the degree of tow opening.

[0108] As a method for opening a tow, for example, a method in which the tow is spread over a plurality of opening rolls and the tow is gradually expanded as the tow progresses, and the tow tension (elongation) is used. For example, a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.

[0109] (Superabsorbent polymer particles)

Superabsorbent polymer particles mean to include “powder” in addition to “particles”. Particle size of the superabsorbent Po Rimmer particles, those used in the absorbent articles of this kind it is possible to use, 1 00~: ίΟΟΟ / ζ πι , especially 150 to 400 111 Ca those ^ desirability 1ヽ₀ As a material for the superabsorbent 14 polymer particles, a material that can be used without any limitation is preferred that has a water absorption of 60 gZg or more. Examples of superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based materials such as starch acrylic acid (salt) graft copolymer, saponified starch-acrylo-tolyl copolymer, sodium carboxymethylcellulose. Cross-linked products and acrylic acid (salt) polymers can be used. As the shape of the superabsorbent polymer particles, it is possible to use a powder or other shape which is suitable for a normally used granular material.

[0110] As the superabsorbent polymer particles, those having a water absorption rate of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversal of the liquid supplied into the absorbent body easily returns to the outside of the absorbent body.

[0111] As the superabsorbent polymer particles, those having a gel strength of lOOOPa or more are preferably used. Thereby, even when it is a case where it is set as a bulky absorber by using tow | toe, the stickiness after liquid absorption can be suppressed effectively.

[0112] The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber. Therefore, although it cannot be generally stated, it can be 50 to 350 gZm ² . By setting the polymer basis weight to 50 g / m ² or less, it is possible to prevent the light weight effect from being exerted by adopting a tuca-like filament aggregate depending on the polymer weight. If 350gZm ² is exceeded, the effect is saturated Excessive superabsorbent polymer particles give the above-mentioned crisp discomfort

[0113] If necessary, the superabsorbent polymer particles can adjust the application density or the application amount in the plane direction of the absorbent body 56. For example, the amount of liquid excretion can be spread more than other parts. When considering gender differences, men can increase the front spray density (quantity) and women can increase the center spray density (quantity). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 may be provided.

[0114] If necessary, a plurality of superabsorbent polymer particles having different particle size distributions are prepared, and can be sequentially sprayed and projected in the thickness direction. For example, by disposing high-absorbent polymer particle spraying means at intervals in the direction of multiple lines, spraying the one with the small particle size distribution first and then spraying the one with the large particle size distribution. It is possible to distribute a small particle size distribution on the lower side in the absorber 56 and a large particle size distribution on the upper side. This form is effective for allowing a particle having a small particle size distribution to penetrate deeply into a filament assembly.

[0115] The ratio between the superabsorbent polymer particles and the filament aggregate affects the absorption characteristics. As a weight ratio in a planar area of 5 cm × 5 cm in the region directly receiving the liquid in the absorber 56, it is desirable that the superabsorbent polymer particle Z filament weight is 1 to 14, particularly 3 to 9.

[0116] (Enveloping sheet)

As the covering sheet 58, a tissue pen, particularly a crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to escape. When using non-woven fabrics instead of crepe paper, hydrophilic SMMS (spunbond Z meltblown Z meltblown Z spunbond) non-woven fabrics are particularly suitable, and materials such as polypropylene and polyethylene Zpolypropylene can be used. The basis weight is preferably 8 to ²⁰ g / m ² , particularly 10 to 15 g / m ² .

[0117] As shown in Fig. 3, this covering sheet 58 has a form that wraps the entire layer of the aggregates of filaments 52, 52 ... and superabsorbent polymer particles 54, 54 ... As shown, it may cover only the back and side surfaces of the layer. Although not shown, only the upper surface and side surface of the absorbent body 56 are covered with a crepe paper nonwoven fabric and the lower surface is liquid-impermeable such as polyethylene. It may be in the form of covering with a sheet, covering the upper surface of the absorbent body 56 with a crepe paper nonwoven fabric, and covering the side surface and the lower surface with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the covering sheet) Become). If necessary, the aggregate of the filaments 52, 52 ... and the superabsorbent polymer particles 54, 54 ... may be sandwiched between two upper and lower sheets or arranged only on the lower surface. This is not the desired form because it is difficult to prevent the migration of the superabsorbent polymer particles.

[0118] (Liquid impervious sheet)

The liquid-impermeable sheet 70 simply means a sheet disposed on the back surface side of the absorber 56. In the present embodiment, the liquid-impermeable sheet 70 is a sheet that interposes the absorber 56 with the top sheet 30. . Therefore, the material of the liquid impermeable sheet is not particularly limited. Specifically, for example, polyolefin resin such as polyethylene or polypropylene, laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, and a nonwoven fabric that is substantially impervious to liquids by interposing a waterproof film (in this case Can be exemplified by a waterproof film and a non-woven fabric to form a liquid-impermeable sheet. Of course, in addition to this, materials having liquid-impervious and moisture-permeable properties that have been favored and used in recent years from the viewpoint of preventing stuffiness can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, and the sheet is formed, and then stretched in a uniaxial or biaxial direction. The microporous sheets obtained as described above can be displayed.

[0119] The liquid impervious sheet 70 is a force that can prevent the liquid from leaking laterally (not shown) by extending it to the use surface in a so-called framed form. The second liquid-impermeable sheet 72 is interposed between the double barrier sheets 64 forming the Noriya cuff 60. According to this configuration, the second liquid-impermeable sheet 72 extends until the Norriya cuff 60 stands up. Therefore, the liquid spread along the top sheet 30 and the barrier one-force huss 60, 60 are spread. There is also an advantage that side leakage of soft stool can be prevented.

[0120] (Barrier first effort)

Barrier force hose 60, 60 provided on both sides of the product is provided to prevent urine and loose stool that move laterally along the top sheet 30 and prevent side leakage. It is an additional element.

[0121] The illustrated non-cuff cuff 60 is a doubled water-repellent nonwoven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30, and protrudes to the front surface side. Is formed. In order to prevent urine from moving laterally on the top sheet 30, in particular, the side of the liquid-impermeable sheet 70 is inserted between the double nonwoven fabric sheets, and the barrier force that protrudes to the surface side It extends halfway through Hus 60.

[0122] Further, the shape of the barrier first force hose 60 itself can be appropriately designed. The cuffs 60 are erected by the contraction force during use. The middle part of rubber thread 62 in the middle is positioned on the center side of thread rubbers 62 and 62 at the front end and fixed to the front and rear ends of topsheet 30. The side is erected diagonally toward the center, and the tip end is inclined obliquely outward from the middle part.

[0123] (Emboss)

In the present invention, as shown in FIGS. 2 and 4, in the region where the absorbent body 56 is located, the top sheet 30 extends from the top sheet 30 to the absorbent body 56 along the longitudinal direction at least on both sides of the wearer's crotch. Groove-shaped embossing reaching Em, Em is formed!

[0124] Further, groove-shaped embosses Ec and Ec may be formed along a direction (in the embodiment, the width direction) intersecting the orientation direction of the aggregate of the filaments 52, 52.

[0125] In the form shown in FIGS. 2 and 4, the first embossed Em, Em formed on the both sides of the wearer's crotch portion in the substantially longitudinal direction, and the second embossed formed on the front and rear portions of the absorber 56, Embossing Ec, Ec, the first embossing Em, Em and the second embossing Ec, Ec are substantially connected to form a substantially annular embossing.

[0126] With regard to embossing, "almost along the longitudinal direction" means that the embossing is formed in a straight line, including an arc or curved line that extends along the longitudinal direction. As shown, it may have an appropriately shaped portion at the longitudinal end. That is, if the length along the longitudinal direction is substantially 5 cm or more, the present invention is effective. [0127] The direction intersecting with the orientation direction of the aggregate of the filaments 52, 52... Is not limited to being orthogonal to the longitudinal direction, and the direction is limited as long as it is the “intersecting direction”. As shown in Fig. 2, it may be formed with arcuate or curved embossing.

[0128] The embossing is preferably formed in such a form that the aggregate of the filaments 52, 52,... Is heat-sealed using a force formed only by pressing, an ultrasonic wave, a heat roll, or the like.

[0129] As long as the embossing has a groove shape, for example, high pressing parts and low pressing parts may be alternately formed, and the embossed groove bottom may have irregularities, but is rather desirable.

[0130] In addition to the configurations shown in Figs. 2 and 4, as shown in Fig. 5, groove-like embosses Em in the longitudinal direction, only the Em is opened, as shown in Fig. 6, the width direction (filament 52 , 52... Groove-like embossing Ec along the direction intersecting the orientation direction of the aggregate, Ec-only form, etc.

Furthermore, in addition to these embosses, as shown in FIG. 7, groove-shaped embosses Ec 1 and Ec 2 in the width direction may be formed at the center and / or outside of the emboss Ec. Further, V, not shown, may be formed by adding other embosses to the center side and / or the outside of the groove-like emboss Em.

[0132] The embossed formation region can be selected by the wearer according to gender.

In the case of female use, it is desirable to make it unevenly distributed on the front side. Paper diapers are different in size for infants and adults, so although they cannot be uniquely defined by the length, they extend over the range of 1Z4 or more with respect to the longitudinal direction of the aggregate of filaments 52, 52 ... It is desirable to form over a range of 1Z3 or more in the width direction.

[0133] On the other hand, the SA P in the embossed Em, Em area, the embossed Ec, Ec area, or the substantially embossed area surrounded by the first embossed Em, Em and the second embossed Ec, Ec. Particle weight can be higher than other areas. According to this embodiment, it is preferable that the liquid absorbability (mainly liquid absorption amount) after urination in that region can be increased.

On the other hand, it is preferable that the depth of the groove-like emboss reaches the absorber 56 as in the above embodiment. The “reaching” degree can be up to the top of the absorber 56, up to the center of the absorber 56, or down to the bottom of the absorber 56.

[0135] The depth of the groove-like embossing is up to 30 parts of the top sheet, the top sheet 30 and the middle. Up to the 40th part of the sheet, the top sheet 30, the intermediate sheet 40, and the upper part of the covering sheet 58 are acceptable, but in order to increase the fit and the liquid absorption speed as in the above embodiment, the absorber 56 is reached. I like things! /.

[0136] On the other hand, the embossed Em, the area between Em, the area between the embossed Ec, Ec, there is! /! Is a substantially annular shape surrounded by the first embossed Em, Em and the second embossed Ec, Ec. In the embossed region, when the density of the aggregate of the filaments 52, 52... Is increased from other parts, the fit and the liquid absorption rate can be increased.

[0137] (Example of tape-type disposable diapers)

On the other hand, FIG.8 and FIG.9 has shown the example of the tape type disposable diaper. FIG. 9 is a view taken along the line 9-9 in FIG. 8, but the absorbent main body 20 is slightly exaggerated.

[0138] The tape-type disposable diaper 10A has fastening pieces attached to both ends of the back side of the diaper, has a hook element on the fastening surface of the fastening piece, and constitutes the back side of the diaper. A diaper in which a backsheet is a non-woven laminate, and the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the backsheet when the diaper is mounted.

[0139] The absorbent main body 20 has an absorbent body 56 interposed between a top sheet 30 and a liquid-impermeable sheet 70. The absorbent body 56 is entirely wrapped with a covering sheet 58 made of tissue paper, and has a rectangular shape in plan view. A holding sheet 80 is provided between the absorbent body 56 and the covering sheet 58.

[0140] Further, the intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56. The liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outer side thereof.

[0141] The top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 with a hot melt adhesive or the like.

[0142] On both sides of the diaper, a barrier force hose 60A protruding toward the use surface side is formed. This noir cuff 60A has a non-woven sheet 64 which also has a non-woven fabric force substantially continuous in the width direction, and an elastic expansion and contraction. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is fasting with hook and loop fasteners It is a piece.

[0143] The inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and the fixing start edge also extends to the extending edge of the liquid-impermeable sheet 70 outward in the width direction. Part is fixed with hot melt adhesive. The outer surface of the liner sheet 64 is fixed to the back sheet 12A with a hot melt adhesive on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, rubber thread 66 is provided.

[0144] The starting end of the inner surface of the NORY sheet 64 fixed to the liquid-impermeable sheet 70 forms an upright end of the NORY cuff 60A. Around the leg, the inside of the standing end is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.

[0145] In this example, by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the back sheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.

[0146] In the fastening piece 130, a base portion of a fastening base material such as plastic, polylaminated nonwoven fabric, or paper is joined to the back sheet 12A, for example, with an adhesive, and has a hook element 130A on the tip side. The hook element 130A is bonded to the fastening substrate with an adhesive. The hook element 130A has a large number of engaging pieces on the outer surface side thereof. A temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A. At the end of the assembly of the product, the temporary fixing adhesive portion 130B is adhered to the force barrier sheet 64 to prevent peeling of the front end side of the fastening piece 130. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body. The fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.

[0147] A target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A on the opening side of the front body, and serves as a guide for fixing the hook element 130A of the fastening piece 130. The target print with the design is made and made visible through the back sheet 12A from the outside.

[0148] When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. Stand up.

[0149] The space surrounded by the standing part forms a confined space for urine or soft stool. When urinating into this space, the urine is absorbed into the absorbent body 56 through the top sheet 30 and the rising part of the Noriya cuff 60A becomes the barrier for the stool solids. Is prevented. In the unlikely event that urine leaks laterally across the standing distal edge of the standing part, side leakage is prevented by a stop function by the flat contact part.

[0150] In the present embodiment, it is desirable that the NORY sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable). Further, the top sheet (nonwoven fabric laminate) of the present invention may have a property of repelling liquid by silicon treatment or the like. In any case, the noir sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A each have a hydrostatic pressure of lOOmmH.

A sheet of 2 o or more is preferable. As a result, air permeability is exhibited at the side portion in the width direction of the product, and the wearer's stuffiness can be prevented.

[0151] Also in this example, the first embossed Em, Em formed in the longitudinal direction on both sides of the wearer's crotch, and the second embossed Ec formed on the front and rear portions of the absorber 56, The first emboss Em, Em and the second emboss Ec, Ec are substantially connected to form a substantially annular emboss. Other modified examples can be employed in the same manner as the above-described pants-type.

[0152] Other points, such as the materials used in each part, are the same as in the case of the above-described pants-type disposable diaper, and thus description thereof is omitted.

(Pants-type use, example of a disposable diaper)

FIG. 10 shows an example of a pants-type disposable diaper. This pants-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent main body 20, and the absorbent main body 20 is fixed to the outer sheet 12. . The absorbent main body 20 is a part that receives and absorbs and holds liquids such as urine and loose stool (menstrual blood in the case of a sanitary napkin described later). The exterior sheet 12 is a part for attaching to the wearer.

[0154] (Exterior sheet) The exterior sheet 12 has a trunk periphery 12T that is determined as a front-rear direction range that also reaches the upper end of the leg opening LO, and a middle opening 12L that is determined as a front-rear direction range of a portion that forms the leg opening LO. . The waistline portion 12T can be conceptually divided into a “trunk upper end” 12W and a “trunk bottom” 12U. The length in the front-rear direction varies depending on the size of the product, and the force that can be determined as appropriate. For example, the waist upper end 12W can be 15-40 mm and the waist lower 12U can be 65-120 mm. . On the other hand, both side edges of the intermediate portion 12L are bound along the circumference of the legs of the wearer, and this is a part where the wearer's legs are put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. In the illustrated example, the width force of the outer sheet 12 at the crotch portion is shorter than the absorbent main body 20. The relationship of this width may be reversed or the same width.

[0155] As shown in Fig. 11, the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed in place, and both sides of the front body 12F and the back body 12B of the exterior sheet 12 The joining region 12A is joined by heat fusion or the like. As a result, a pants-type disposable diaper having the structure shown in FIG. 10 and having a waist opening WO and a pair of redder openings LO is obtained.

[0156] The exterior sheet 12 may be formed of a single-layer sheet, but is preferably formed of a two-layer sheet in which an outer layer and an inner layer are bonded together with an adhesive such as a hot melt adhesive. The outer layer and the inner layer can be used without any particular limitation, but it is preferable to use a water-repellent nonwoven fabric from the viewpoint of touch and waterproofness. Each of the outer layer and the inner layer may be formed by laminating a plurality of materials. The thicknesses of the outer layer and the inner layer can be determined as appropriate, but the thickness of the outer layer is preferably equal to or greater than the thickness of the inner layer. The outer layer and the inner layer preferably each have a basis weight in the range of 5 to 30 g / m ² . Further, the thickness of the outer layer 12S is preferably 5 mm or less, and the thickness of the inner layer is preferably lmm or less.

[0157] The elastic sheet 12C, 12D is fixed to the exterior sheet 12 with a hot melt adhesive or the like in an expanded state. The elastic elastic members 12C and 12D can be used without particular limitation as long as they are long and narrow rubber materials such as threads, strings, and strips.

More specifically, the waist elastic elastic member 12C extending along the width direction is spaced a predetermined distance in the front-rear direction between the outer layer and the inner layer in the waist lower portion 12U of the exterior sheet 12. Many, for example, about 15 to 40 are provided in parallel.

[0159] As shown in FIG. 10, the waist elastic elastic member 12C is cut at the portion overlapping the absorbent main body 20 by embossing force needle piercing or the like, or there is a waist around the portion overlapping the absorbent main body 20 By not providing the elastic elastic member 12C, the contraction force can be eliminated or weakened. In the case of cutting, as disclosed in Japanese Patent Application Laid-Open No. 2002-178428, a large number of points may be cut at a predetermined interval in the width direction, or only one point may be cut. Thus, if the elastic expansion / contraction member 12C is discontinuous in the portion (either part or all) that overlaps the absorbent main body 20, the contraction force acting on the absorbent main body 20 is eliminated or weakened. Therefore, the absorption inhibition due to the shrinkage of the absorbent main body 20 is less likely to occur. The width of the cut or missing portion of the elastic elastic member 12C can be determined as appropriate. Also, unlike the illustrated embodiment, the waist elastic elastic member 12C can be made discontinuous only in one of the back side B and the ventral side F.

[0160] The thickness and arrangement interval of the waist elastic elastic member 12C can be determined as appropriate, but preferably the thickness is lOOOOdtex or less, particularly 700 to 400 dtex, and the arrangement interval is l to 20 mm, especially 1 to 10 mm. Is done.

On the other hand, at the upper end U around the trunk of the exterior sheet 12, the outer layer is folded back inside the exterior sheet 12 at the trunk opening WO, and the end of the trunk opening WO is between the folded portion and the exterior sheet 12. The body end elastic elastic member 12D is fixed in an extended state with a space parallel to the edge. The thickness, interval, and number of the trunk end elastic members 12D can be determined as appropriate. For example, the thickness is preferably 400 to 900 dtex, the interval is 3 to 6 mm, and the number is preferably about 4 to 10.

[0162] (Absorbent body)

As shown in FIG. 12, the absorbent main body 20 includes a liquid-permeable top sheet 30, a liquid-impermeable sheet (also referred to as a back sheet) 70, and an absorbent element 50 interposed therebetween. ing. On the back side of the liquid-impermeable sheet 70, the above-described exterior sheet 12 is provided. Furthermore, on both sides of the absorbent main body 20, there are provided noir cuffs 60, 60 which protrude toward the use surface side.

[0163] (Top sheet) The top sheet 30 can be formed using a liquid-permeable material. For example, a porous or non-porous nonwoven fabric, a porous plastic sheet, or the like can be used. Non-woven fabrics are not limited by raw material fibers, for example, polyolefins such as polyethylene and polypropylene, synthetic fibers such as polyesters and polyamides, regenerated fibers such as rayon cupra, natural fibers such as cotton, etc. A mixed fiber or a composite fiber in which two or more of these are used can be used. Further, the nonwoven fabric is not limited by the production method, and is produced by a known method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method, etc. Things can be used. Of these, the thermal bond method is the preferred cache method if the bulkiness and softness preferred by the span lace method are desired if flexibility and drapeability are desired.

[0164] The top sheet 30 may be a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.

[0165] (Liquid impervious sheet)

The liquid-impermeable sheet 70 is a sheet disposed on the back side of the absorber 56. The material of the liquid-impermeable sheet is not particularly limited. For example, an olefin-based resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, or a waterproof film is interposed. For example, a non-woven fabric that is substantially impervious to liquid (in this case, a waterproof film and a non-woven fabric constitute a liquid-impermeable sheet) can be used. Of course, in addition to this, materials having liquid-impervious and moisture-permeable properties that have been used in recent years because of their ability to prevent stuffiness can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, and the sheet is formed. An example of the microporous sheet obtained by stretching is as follows.

[0166] (Absorbing element)

Absorbing element 50 consists of lower layer absorber 56B and upper layer absorbent provided on the top sheet 30 side. 56A, of which the upper absorbent body 56A is obtained by opening the tow and is formed of an aggregate of hardly absorbable filaments 52 having an absorption amount of 1.0 times or less of its own weight. The filament 52 of the upper layer absorbent body 56A extends along the top sheet 30 in the illustrated direction in the front-rear direction, and as shown in FIG. 11, both ends (tip and base ends) of the filament 52 are absorbed by the lower layer. The body 56B is spaced inward from the leading and trailing edges (periphery of the absorbent element 50).

[0167] In this case, even if the liquid component supplied to the upper absorbent body 56A passes through the upper absorbent body 56A and reaches both ends of the filament, the diffusion of the liquid stops there and diffuses to the periphery of the absorbent element 50. do not do. Then, the liquid component diffused in the upper absorber 56A moves to the lower absorber 56B and is held there.

[0168] The distance y between the both ends of the filament 52 (the front edge and the rear edge of the upper layer absorbent body 56A) and the front edge and the rear edge of the lower layer absorbent body 56B varies depending on the target wearer, so it can be said in general. Although it is not, it is desirable that it is 10 to 300 mm, particularly 50 to 150 mm. If the separation distance y is too short, the effect of preventing leakage will be poor, and if it is too long, the diffusion distance by the upper absorber 56A will be short, and the diffusion performance may be poor.

[0169] In addition, it is desirable that the upper-layer absorbent body 56A is separated from both side edges of the lower-layer absorbent body 56B not only at both ends of the filament 52 but also at both side edges. Although this separation distance X varies depending on the target wearer, it cannot be generally stated, but it is preferably 0 to 90 mm, particularly preferably 0 to 50 mm.

[0170] As the size of the lower layer absorber 56B, the length of the upper layer absorber 56A that is preferably 200 to 600 mm in length and 100 to 180 mm in width is preferably 100 to 500 mm in width and width 50 to 120 mm is preferable.

[0171] The assembly of the filaments 52 constituting the upper-layer absorber 56A is a bundle-like assembly, and is likely to be broken or out of shape. Therefore, in order to facilitate the handling in production, as shown in FIG. 12, the liquid permeable sheet 40 is attached to the side surface of the top sheet 30 of the upper absorbent body 56A using a hot melt adhesive or the like. As shown in Fig. 14, the entire periphery (front and back and both sides) of the upper absorbent body 56A is integrally wrapped with a liquid permeable sheet 40, or as shown in Fig. 14, the liquid permeable sheet is placed on the back surface of the upper absorbent body 56A. 41 is preferably pasted using a hot melt adhesive or the like. In the case of the former two, a part or all of the liquid-permeable sheet 40 will be described later. Intermediate sheet. In either case, a separate topsheet 3

An intermediate sheet can be provided between 0 and the upper absorber 56A.

[0172] The hardly absorbent filament aggregate constituting the upper layer absorbent body 56A can be produced by opening a tow (fiber bundle) composed of hardly absorbent filaments (substantially continuous long fibers). Filament 52 can extend along any direction, such as the longitudinal, width, or thickness direction of the article.

[0173] The material of the hardly absorbable filament 52 can be used without particular limitation if the absorbed amount is 1.0 times or less of its own weight. For example, polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, Chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide)

, Polyester, polylactamamide, polybutyrate, etc.) can be used. Cellulose esters and cellulose are particularly preferred.

[0174] As cellulose, cellulose derived from plants such as cotton, linter and wood pulp, butterfly cellulose, etc. can be used. Regenerated cellulose such as rayon can be used as a spinning fiber. Also good.

[0175] Examples of the cellulose ester that can be suitably employed include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

[0176] The average degree of polymerization of the cellulose ester can be, for example, about 10 to 1000, preferably about 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3. It is preferably about 1 to 2.15, more preferably about 1.1 to 2.0. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability. [0177] As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. Incidentally, in the case of cellulose acetate, the absorbed amount is about 0.1 to 0.3 times its own weight. The acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.

[0178] The hardly absorbent filament may contain various additives such as a heat stabilizer, a colorant, an oil, a yield improver, a whiteness improver, and the like.

[0179] The fineness of the hardly absorbable filament is, for example, 1 to 16 dtex, preferably 1 to: LOdtex, and more preferably 1 to 5 dtex. 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, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. In addition, crimped fibers that are uniformly crimped are often used. When crimped fibers are used, a bulky and lightweight absorbent body can be produced, and a highly integrated tow can be easily produced by entanglement between the fibers. The cross-sectional shape of the filament is not particularly limited, and may be any shape such as a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Good. For example, the flame noodles are in the form of a tow (fiber bundle) formed by bundling 3,000 to 1,000,000, preferably <5,000 to 1,000,000 single fibers. Used in. The fiber bundle is preferably formed by concentrating about 3,000-1,000,000 filaments.

[0180] Since the entanglement between the filaments is weak, a binder having an action of adhering or fusing the contact portion of the filament can be used mainly for the purpose of maintaining the shape. Binders include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various grease adhesives, especially heat Plastic resin can be used.

[0181] The thermoplastic resin used as the binder is a resin that exhibits an adhesive force upon melting and solidification, and includes a water-insoluble or hardly water-soluble resin and a water-soluble resin. Water insoluble The water-soluble or poorly water-soluble rosin and the water-soluble rosin can be used together as necessary.

[0182] Examples of water-insoluble or poorly water-soluble resins include olefin-based homo- or copolymers such as polyethylene, polypropylene, ethylene-propylene copolymer, and ethylene acetate butyl copolymer, poly (butyl acetate), and polymethacrylic acid. Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene 榭脂, petroleum 榭脂), such as hydrogen added hydrocarbon 榭脂 can be used. These thermoplastic rosins can be used singly or in combination.

[0183] The water-soluble rosin has various water-soluble polymers such as polybutyl alcohol, polypyrrole pyrrolidone, polybutyl ether, bulle monomer, carboxyl group, sulfonic acid group or salts thereof. Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble coagulants can be used alone or in combination of two or more.

[0184] Various additives such as stabilizers such as antioxidants and ultraviolet absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.

[0185] Since the tow can be produced by a known method, it will not be described in detail. Cellulose diacetate tow bale that can be suitably used for the absorbent element 50 is commercially available from Cera-Izu Co., Ltd. Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 gZcm ³ and a total weight of 400-600 kg.

[0186] From this bale, the tow is peeled off and opened in a wide band shape so as to have a desired size and bulk. The opening width of the tow is arbitrary, and may be, for example, a width of 100 to 2000 mm, preferably about 100 to 300 mm, which is the width of the product absorber. Further, the density of the absorbent can be adjusted by adjusting the degree of tow opening. [0187] Examples of the method for opening the tow include a method in which the tow is passed over a plurality of opening rolls, and the tow is gradually widened as the tow progresses, and the tow is stretched (elongated). For example, a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.

[0188] The upper-layer absorber 56A preferably does not contain superabsorbent polymer particles, but can also be contained. Details of the superabsorbent polymer particles will be described later.

[0189] On the other hand, the lower layer absorbent body 56B is a general-purpose absorbent body obtained by mixing pulp fibers 55 and superabsorbent polymer particles 54 and stacking them in a cotton form. The lower layer absorbent body 56B can be formed in a rectangular shape like the upper layer absorbent body. However, as shown in the example in the figure, both sides of the crotch part are cut out in an arc shape around the legs! You can also

[0190] The superabsorbent polymer particles 54 include "powder" in addition to "particles". The particle size of the superabsorbent polymer particles 54 is not particularly limited, but is preferably 100 to 1000 / ζ πι, particularly 150 to 400 μm. The water absorption amount of the superabsorbent polymer particles 54 is not particularly limited, but is preferably 40 gZg or more. The superabsorbent polymer particles 54 include starch, cellulose, and synthetic polymers, such as starch acrylic acid (salt) graft copolymer, starch acrylonitrile copolymer, carboxymethyl cellulose, and sodium carboxymethyl cellulose. Cross-linked products and acrylic acid (salt) polymers can be used. As the shape of the superabsorbent polymer particles 54, a normally used granular material is suitable. Other shapes can also be used.

[0191] As the superabsorbent polymer particles 54, those having a water absorption speed of 0 second or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversal that the liquid supplied into the absorber 56 returns to the outside of the absorber easily occurs. As the superabsorbent polymer particles 54, those having a gel strength of lOOOPa or more are preferably used. As a result, the stickiness after absorbing the liquid can be effectively suppressed.

[0192] The basis weight of the superabsorbent polymer particles 54 in the lower layer absorbent body 56B can be appropriately determined according to the amount of absorption required for the use of the absorbent body. Therefore, although it cannot be generally stated, it can be 50 to 350 gZm ² . By reducing the basis weight of the superabsorbent polymer particles 54 to 50 gZm ² or less, the weight of the superabsorbent polymer particles 54 is reduced. It is possible to prevent the fruit from becoming difficult to be exhibited. Above 350 gZm ² , the excess of superabsorbent polymer particles 54, which just saturates the effect, gives a gritty feeling when touching the product.

[0193] If necessary, the density or amount of the superabsorbent polymer particles 54 can be adjusted in the plane direction of the lower layer absorbent body 56B. For example, a larger amount of superabsorbent polymer particles 54 can be present at the excretion site than at other sites. When considering gender differences, men can increase the density (amount) on the front side, and women can increase the density (amount) in the center. Further, it is also possible to provide a portion where the superabsorbent polymer particles 54 do not exist locally (for example, in a spot shape) in the planar direction of the lower layer absorber 56B.

[0194] (Enveloping sheet)

When the superabsorbent polymer particles 54 are contained in the lower layer absorbent body 56B, it is preferably wrapped with a covering sheet 58. The same applies to the case where the superabsorbent polymer particles 54 are contained in the upper layer absorbent body 56A. This covering sheet 58 is also a component of the absorbent element 50.

[0195] As the covering sheet 58, a tissue peno, particularly a crepe paper, a nonwoven fabric, a polylaminated nonwoven fabric, a sheet having small holes, and the like can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to escape. When using non-woven fabrics instead of crepe paper, hydrophilic SMMS (spunbond Z meltblown Z meltblown Z spunbond) non-woven fabrics are particularly suitable, and materials such as polypropylene and polyethylene Zpolypropylene can be used. The basis weight is preferably 8 to ²⁰ g / m ² , particularly 10 to 15 g / m ² .

[0196] The covering sheet 58 may adopt a form in which only the lower layer absorbent body 56B is wrapped as shown in FIG. 12, and a form in which the upper layer absorbent body 56A and the lower layer absorbent body 56B are wrapped together as shown in FIG. it can. Further, it is desirable that the covering sheet 58 wraps the entire object as shown in FIG. 12, but it is also possible to wrap only the back and side surfaces of the object (not shown).

[0197] (Intermediate sheet)

In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorber 56A, an intermediate sheet ("second sheet") that has a higher liquid permeation speed than the top sheet 30 so that it directly contacts the back surface of the top sheet 30. 40) can also be provided. This intermediate sheet 40 is also a component of the absorption element 50. The intermediate sheet 40 quickly transfers the liquid to the upper absorber 56A. When the absorption performance is increased, the “returning” phenomenon of the absorbed liquid by force is prevented.

[0198] As the intermediate sheet 40, the same material as the top sheet 30, spun lace, pulp non-woven fabric, mixed sheet of pulp and rayon, point bond or crepe paper can be used. Air-through nonwoven fabric and spunbond nonwoven fabric are particularly preferred.

[0199] The intermediate sheet (second sheet) 40 is arranged in contact with the back surface of the top sheet 30. An intermediate sheet (second sheet) 40 may be omitted.

[0200] The intermediate sheet 40 is preferably narrower than the absorbent element 50 and arranged in the center as shown in the figure, but it may be provided over the entire width of the absorbent element 50. The length in the front-rear direction of the intermediate sheet 40 may be the same as the length of the absorbent element 50, or may be within a short length range centered on the excretory part. In particular, the width and length of the intermediate sheet 40 are preferably the same as the width and length of the upper absorbent body 56A.

[0201] (holding sheet)

When the superabsorbent polymer particles 54 are used as the absorbent element 50, as shown in FIGS. 15 and 17, the lower absorbent body 56B or A holding sheet 80 can be provided between the back surface of the absorbent body 56 and the back surface side portion (lower portion) of the covering sheet 58. This holding sheet 80 is also a component of the absorbent element 50. The holding sheet 80 is not an essential component and therefore may not be provided.

[0202] The superabsorbent polymer particles 54 may move during the manufacturing process or through the flow path until use by the consumer. For example, when the superabsorbent polymer particles 54 are mixed in the lower layer absorber 56B, the superabsorbent polymer particles 54 may fall out from the lower layer absorber 56B. The unevenness of the superabsorbent polymer particles that have fallen out gives a sense of incongruity when touched by the hand when a consumer uses it. For this problem, if a holding sheet 80 having a holding capacity of the absorbent polymer is interposed on the back side of the part where the superabsorbent polymer particles 54 are disposed, the stiffness that is not sufficient only by the covering sheet 58 is reinforced. Thus, when the consumer touches it when using it, it reduces or prevents discomfort.

[0203] The material of the holding sheet 80 is not particularly limited, and the holding performance of the superabsorbent polymer particles 54 It is enough if you have it. Specifically, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or hydrophobizing agent, etc.), Examples include polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, and acetate fiber.

[0204] When the holding sheet 80 is a non-woven fabric, the holding sheet 80 has a compression energy based on the KES test of 0.01 to: LO. OOgfcm / cm ² , preferably 0.01 to: L OOgfcm / cm ² And a compression resilience of 10 to 100%, preferably 70 to 100%.

[0205] The reason for providing the holding sheet 80 is, for example, to hold the superabsorbent polymer particles 54 that have fallen down (dropped out) from the absorber 56. Accordingly, since the superabsorbent polymer particles 54 that have come out come into contact with the user via the covering sheet 58 and the holding sheet 80, there is no possibility of being transmitted to the user as a sense of incongruity. In particular, a non-woven fabric having the above compression energy and compression resilience exhibits a sufficient holding function.

[0206] Further, since the superabsorbent polymer particles 54 that have escaped are held by the holding sheet 80 and do not move on the covering sheet 58, there is no possibility of uneven distribution of absorption capacity. In particular, in order to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80, an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance. Also, by making the upper surface of the holding sheet 80 (the surface facing the use surface side) rough, the superabsorbent polymer particles 54 may be prevented from moving on the holding sheet 80. As roughening or fluffing means for this purpose, non-net surface that is not the net surface at the time of manufacturing the nonwoven fabric, marble force check, processing by needle punch, brushing check, etc. can be mentioned. Can do.

[0207] The holding sheet 80 may be provided only below the absorber 56 as shown in Fig. 15 or the like, and although not shown, the holding sheet 80 passes through the side surface of the absorber 56 and is wound up to the upper surface of the absorber 56 so as to extend. It's okay. It is also possible to use a plurality of holding sheets 80 in a stacked manner.

[0208] In the above example, the holding sheet 80 is provided between the absorbent body 56 and the back surface portion of the covering sheet 58. The force holding sheet 80 as an example may be on the back side from the covering sheet 58 (the form is not shown). In short, if the holding sheet 80 is provided on the back side with respect to the absorber 56, , The rear surface force of the product will reduce or not cause a crisp discomfort when touching.

[0209] When the holding sheet 80 is provided between the absorbent body 56 and the liquid-impermeable sheet 70, a fiber assembly having a larger amount of absorption than the hardly absorbent filament assembly, for example, the amount of absorption is about 5 to 30 times. It is preferable to form the holding sheet 80 using a fiber assembly because the holding sheet 80 can supplement the water absorption performance of the absorbent body 56 and improve the initial absorption rate and diffusibility.

[0210] (Forms of other absorbent elements)

[0211] The lower absorbent body 56B of the absorbent element 50 is preferably a mixed product of pulp fibers 55 and superabsorbent polymer particles 54 as in the above example, but it is difficult to absorb the same as the upper absorbent body 56A. Superabsorbent polymer particles 54 can also be included in the aggregate of filaments 52. In this case, it is desirable that the superabsorbent polymer particles 54 are dispersed substantially throughout the thickness direction with respect to the aggregate of filaments 52. This substantially dispersed state in the entire thickness direction is conceptually shown in the enlarged view of the main part in FIG. If the superabsorbent polymer particles 54 are not present in the upper part, lower part, and middle part of the filament aggregate, or if there are very few, it cannot be said that the filament aggregate is dispersed throughout the thickness direction. . Therefore, “distributed throughout the thickness direction” means that the filament aggregate is “evenly distributed” throughout the thickness direction, and is “distributed unevenly in the upper, lower and / or middle portions”. However, it is still included in the form of being dispersed in the upper, lower and middle parts. Further, a form in which some highly absorbent polymer particles 54 remain on the surface of the filament aggregate, or a form in which some highly absorbent polymer particles 54 fall off the filament aggregate force and are on the covering sheet 58. The form on the holding sheet 80 is not excluded.

[0212] Further, as shown in FIG. 17, the absorbing element 50 may have a structure having a single-layer absorber 56 that also has the above-mentioned hardly-absorbing filament assembly force. In this case, the separation distance from the peripheral edge of the absorbent element 50 at both ends of the filament, that is, the separation distance between the front edge and the rear edge of the absorbent body 56 and the front edge and the rear edge of the absorbent element 50 is 10 to 125 mm. Desirably, 50 to 125 mm is particularly desirable. If this distance is too short, the leakage prevention effect may be poor. Others are basically the same as the above-described upper layer absorbent body 56A, and it is possible to adopt an appropriate configuration such as attaching a liquid permeable sheet such as the second sheet 40 or providing an embossed recess F described later. .

[0213] Although not shown, the absorbent element 50 may have a structure having three or more layers of absorbers.

In this case, it is preferable that one or a plurality of absorbent bodies located on the top sheet 30 side is formed of the above-mentioned hardly absorbent filament aggregate.

[0214] Furthermore, in the present invention, the upper absorber and the lower absorber are arranged upside down with respect to the embodiment shown in Fig. 12 and the like, that is, although not shown, the lower absorber is a hardly absorbing filament. A form is also proposed in which both ends of the filament are separated from the periphery of the upper absorbent body to the inside due to the aggregate force. Except for upside down, it is basically the same as the previous embodiment.

[0215] When a plurality of absorbers are stacked as the absorbent element 50, all of them may have the same material configuration, or one or a plurality of layers may have different material configurations with respect to other layers. it can. Moreover, it is preferable that the superabsorbent polymer particles have no power layer regardless of the number of layers.

[0216] (Barrier first effort)

Barrier force hose 60, 60 provided on both sides of the product is provided to prevent urine and loose stool moving laterally along the top sheet 30 and to prevent side leakage.

[0217] The illustrated non-cuff cuff 60 is a doubled water-repellent non-woven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30, and protrudes to the front surface side. Is formed. In order to enhance the leak-proof property, in particular, the second liquid-impermeable sheet 72 is inserted between the double nonwoven fabric sheets, and extends to the middle of the noir cuff 60 projecting to the surface side.

[0218] Further, the shape of the barrier cuff 60 itself can be designed appropriately. In the example shown in the figure, an elastic elastic member, for example, rubber thread 62 is stretched at the tip and middle of the protrusion of the barrier cuff 60. The cuffs 60 are erected by the contraction force during use. As shown in FIG. 12, the intermediate rubber thread 62 is positioned closer to the center than the front rubber threads 62, 62 and is fixed to the front and rear end portions of the top sheet 30 as shown in FIG. The cuff 60 has a configuration in which the base side of the cuff 60 is erected obliquely with a force toward the center, and the tip part of the cuff 60 is erected diagonally outward from the middle part.

[0219] (Embossed)

As shown in FIG. 16, recesses E and F by embossing may be formed in the surface side force thickness direction of the top sheet 30. In this case, the embossed recess E is formed only on the top sheet 30; although not shown, the embossed recess is formed only on both the top sheet 30 and the intermediate sheet 40. As shown in the figure, the embossed recess F can be formed so as to reach a part or almost the entire thickness of the absorber 56A (or 56B) from the surface side of the top sheet 30. To form such embossed recesses E and F, the intermediate sheet 40 has a basis weight of 8 to 60 gZm ² , a thickness of 0.2 to 1.5 mm, and the top sheet 30 has a basis weight of 15 The range of ~ 80gZm ² and the thickness of 0.2 ~ 3.5mm is preferable because sufficient embossing force can be obtained under the condition that the liquid permeability is not hindered.

[0220] Although not shown in the drawing, a recess by embossing may be formed only in the intermediate sheet 40 without forming a recess in the top sheet 30. Further, a recess may be formed in the top sheet 30 and the intermediate sheet 40. The embossed recess may be formed only in the absorbent element 56, or the embossed recess may be formed only in the absorbent body 58 without forming the recess in the top sheet 30, the intermediate sheet 40, and the covering sheet 58.

[0221] Furthermore, although not shown, a recess by embossing can be formed in the thickness direction of the back surface side force. Such recesses are embossed so as to reach any member from the back side of the holding sheet 80, the covering sheet 58, the liquid-impermeable sheet 70 or the exterior sheet 12 to the top sheet 30. Can be formed. Further, such a recess on the back surface side is preferably formed together with the recess E on the front surface side, but only the recess on the back surface side can be formed without forming the recess E on the front surface side. When the recesses are provided on both the front and back sides, the shape of the recesses may be common to the front and back sides, or may be different from each other. In this case, the embossing force may be applied simultaneously on the front and back with the product sandwiched between the engraving roll and the engraving roll.

[0222] The recesses E and F by embossing have the effect of inducing and diffusing liquid in the extending direction. It also has the effect of increasing rigidity. Therefore, it is desirable to determine the shape of the recesses E and F by embossing in consideration of these effects. For example, the recess is substantially continuous in a groove shape (compound In addition to a case in which a plurality of recesses are arranged in a row at intervals and a single groove is formed), a plurality of recesses may be arranged in the form of dots at intervals. In addition, as the planar pattern, groove-shaped or dot-shaped concave portions are arranged in the longitudinal direction, the width direction, a lattice shape combining these, a zigzag shape that reciprocates in the width direction (staggered shape), or irregularly. Forms can be taken. Furthermore, an appropriate form such as a pin shape, a Mt. Fuji shape, or a bellows shape can be employed.

[0223] In particular, the embossed recess is preferably formed in a planar pattern as shown in FIG. 11 so that the surface side force of the top sheet 30 reaches the upper absorber 56A as shown in FIG. The embossed recesses F of this planar pattern have arc-shaped portions that extend along the front-rear direction at least on both sides of the crotch part, and have a middle part in the front-rear direction bulge toward the center in the width direction. When such an arc-shaped portion is provided, the use surface at the center in the width direction is raised from both sides, and the fit between the crotch and the crack can be improved. Further, in the embossed recess F in the illustrated form, the front and rear end portions of the inner arc-shaped portion are connected by a portion extending in the width direction, and the excretion site is surrounded by the annular embossed recess F. Further, a plurality of arc-shaped portions on both sides are formed at intervals in the width direction as shown in the figure. As a result, unnecessary diffusion of the liquid is suppressed by the embossed recess F, and the leakage prevention effect is excellent.

[0224] (Others)

Although not shown, the constituent members of the absorbent main body 20 can be fixed to each other by a solid such as a hot melt adhesive, a bead, or spiral coating.

[0225] (Example of tape-type disposable diapers)

On the other hand, FIG.18 and FIG.19 has shown the example of the tape type disposable diaper. FIG. 19 shows a slightly exaggerated view of the force-absorbing main body 20 shown in FIG.

[0226] The tape-type disposable diaper 10A has fastening pieces attached to both ends of the back side of the diaper, has a hook element on the fastening surface of the fastening piece, and constitutes the back side of the diaper. A diaper in which a backsheet is a non-woven laminate, and the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the backsheet when the diaper is mounted. [0227] The absorbent main body 20 has an absorbent body 56 interposed between a top sheet 30 and a liquid-impermeable sheet 70. The absorbent body 56 is entirely wrapped by a covering sheet 58, and has a rectangular shape in plan view. A holding sheet 80 is provided between the absorber 56 and the covering sheet 58! /.

[0228] Further, an intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56. The liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outer side thereof.

[0229] The top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 with a hot melt adhesive or the like.

[0230] On both sides of the diaper, a barrier one-force hull 60A that protrudes toward the use surface side is formed. This noir cuff 60A has a non-woven sheet 64 that also has a non-woven fabric force substantially continuous in the width direction, and an elastic expansion and contraction. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is a fasting piece with a hook-and-loop fastener.

[0231] The inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and the fixing start edge also extends to the extending edge of the liquid-impermeable sheet 70 outward in the width direction. Part is fixed with hot melt adhesive. The outer surface of the liner sheet 64 is fixed to the back sheet 12A with a hot melt adhesive on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, rubber thread 66 is provided.

[0232] The starting end of the inner surface of the NORY sheet 64 fixed to the liquid-impermeable sheet 70 forms an upright end of the NORY cuff 60A. Around the leg, the inside of the standing end is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.

[0233] In this example, by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the back sheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.

[0234] The fastening part 130 has a base of a fastening base material such as plastic, polylaminated nonwoven fabric, or paper, joined to the back sheet 12A, for example, with an adhesive, and has a hook on the tip side. It has element 130A. The hook element 130A is bonded to the fastening substrate with an adhesive. The hook element 130A has a large number of engaging pieces on the outer surface side thereof. A temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A. At the end of the assembly of the product, the temporary fixing adhesive portion 130B is adhered to the force barrier sheet 64 to prevent peeling of the front end side of the fastening piece 130. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body. The fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.

[0235] At the opening side of the front body, a target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A, and serves as a guide for fixing the hook element 130A of the fastening piece 130. The target print with the design is made and made visible through the back sheet 12A from the outside.

[0236] When the diaper is attached, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. To do.

[0237] The space surrounded by the standing part forms a confined space for urine or soft stool. When urinating into this space, the urine is absorbed into the absorbent body 56 through the top sheet 30 and the rising part of the Noriya cuff 60A becomes the barrier for the stool solids. Is prevented. In the unlikely event that urine leaks laterally across the standing distal edge of the standing part, side leakage is prevented by a stop function by the flat contact part.

[0238] In the present embodiment, it is desirable that the NORY sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable). Further, the top sheet (nonwoven fabric laminate) of the present invention may have a property of repelling liquid by silicon treatment or the like. In any case, the noir sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A each have a hydrostatic pressure of lOOmmH.

[0239] Other points, such as the materials used in each part, are the same as in the case of the above-described pants-type disposable diaper, and will not be described. [0240] (Example of how to make disposable diapers)

Next, an embodiment of a method for manufacturing a disposable diaper to which the absorber manufacturing method of the present invention is applied will be described.

[0241] (Manufacturing process of absorbent element)

FIG. 20 shows a manufacturing process example of the absorbent element 50 shown in FIG. 12, FIG. The covering sheet 58 is also supplied to the line with upstream force, and when the holding sheet 80 is provided next, the holding sheet 80 is supplied. To this holding sheet 80, an adhesive such as a hot-melt adhesive having adhesiveness can be applied in advance to fix the lower layer absorbent body 56B supplied later.

[0242] Continuously, the lower absorbent body 56B force formed by mixing and stacking the pulp fibers 55 and the superabsorbent polymer particles 54 in the stacking drum device 91 intermittently the covering sheet 58 or holding Supplied on sheet 80. Thereafter, the lower layer absorbent body 56B is wrapped by the covering sheet 58 by passing through the sailor 92.

[0243] On the other hand, after the intermediate sheet 40 is supplied and an adhesive such as a hot melt adhesive is applied from the nozzle 95 to the upper surface of the intermediate sheet 40, the upper absorbent body 56A is formed on the upper surface of the intermediate sheet 40. Then, the hardly absorbable filament aggregate 52Z formed by opening the tow 52Y is supplied and pasted. Details of the opening process will be described later. Instead of this step, the intermediate sheet 40 wider than the upper absorbent body 56A is used, and the hardly absorbent filament aggregate 52Z is disposed on the intermediate sheet 40, and then both sides of the intermediate sheet are attached using a sailor. The absorbent element shown in FIG. 13 can be manufactured by folding back and wrapping on the upper surface of the hardly absorbent filament aggregate 52Z.

[0244] When superabsorbent polymer particles are included in the upper absorbent body 56A, the SAP supply device 90 uses the SAP absorbent device 90 to attach the hardly absorbent filament aggregate after the fiber is opened and prior to pasting to the lower absorbent body 56B. 52Z can contain superabsorbent polymer particles. An example of the SAP supply device 90 will be described later.

[0245] Subsequently, the hardly absorbent filament aggregate 52Z having the intermediate sheet 40 attached to the lower surface is cut into a predetermined length by a cutting and sticking device 93 such as a slip cutter, and the cut hardly absorbed The conductive filament aggregate is affixed intermittently on the lower layer absorber 56B. In other words, it is cut at a predetermined position on the lower absorber 56B that is transported at a predetermined interval. The hardly absorbable filament aggregates are sequentially attached.

[0246] In the illustrated embodiment, in front of the cutting and sticking device 93, the intermediate sheet 40 is at the bottom and the hardly absorbent filament aggregate 52Z is at the top. The intermediate sheet 40 is on the upper side and the hardly absorbent filament aggregate 52Z is on the lower side, resulting in the form shown in FIG. On the other hand, if it is configured not to be folded by the cutting and sticking device 93, the configuration is the same as that shown in FIG.

[0247] The lower layer absorber 56B to which the upper layer absorber 56A is affixed is then divided in the transport direction by the cutter device 94 to form individual absorption elements 50.

[0248] (For pants-type disposable diapers)

Next, in the case of a pants-type disposable diaper, as shown in FIG. 21, the constituent elements of the barrier force hose 60 and the top sheet 30 are supplied from above, and the liquid-impervious sheet 70 is also supplied in the downward direction. Here, in the supply line of the NORY sheet 64 constituting the NORY cuff 60, the rubber thread 62 is stretched between the two non-woven fabrics and the second liquid impermeable sheet 72 is fixed in advance by a device (not shown). Is supplied to the main line together with the top sheet 30. The components of the noir cuff 60 supplied to the main line, the top sheet 30 and the liquid-impermeable sheet 70 are folded into a shape shown in FIG.

[0249] Then, the absorptive main body 20 having a rectangular shape whose longitudinal direction is along the conveying direction is cut by the cutter device 98. The obtained absorbent main body 20 is turned 90 degrees by the turning device 100 so that the longitudinal direction of the absorbent main body 20 is orthogonal to the line.

[0250] On the other hand, in the line of the exterior sheet 12, the thread rubber 12C flows in advance (not shown) between two non-woven sheets, and a cutter (not shown) is used to form a leg-surrounding portion. When the combination station 102 is reached, the absorbent main body 20 that has been turned around is installed between the cut-out portions, and is fixed with a hot-melt adhesive or the like. Combined. After that, it is folded up and down with the horizontal line as a boundary, and the joining regions 12A on both sides of the front body 12F and the back body 12B of the exterior sheet 12 are joined by heat fusion or the like. Thereafter, the product is divided in the line direction (separation means is not shown), and individual products are obtained. [0251] (In the case of tape-type disposable diapers)

On the other hand, FIG. 22 shows an example of a method for manufacturing the tape-type disposable diaper shown in FIGS. Until the individual absorbent element 50 is obtained, it is the same as in the case of the pants type. The top sheet 30 is supplied to the individual absorbent elements from above, and the liquid-impervious sheet 70 is also supplied to the downward force. Thereafter, the noir sheet 64 constituting the noir cuff 60 is supplied. In the supply line of the noir sheet 64, supply is performed in a state where the rubber thread 62 is fixed under tension between two nonwoven fabrics by a device (not shown). At the end of the line, the semi-finished product with the absorbent main body is cut by the cutter device 98 to obtain the product 10.

[0252] (Opening)

The opening process can be performed by a line having the form shown in FIG. 23, for example. In other words, the toe 52Y is pulled out from the bail 52X and is gradually expanded through the widening device 120, and then passed to the thickening device 110 through the first yuf ° 126A, the second yuf ° 126B, and the third yuf ° 126C. Then, after the thickness is enlarged and the final aggregate of filaments 52Z is formed, the superabsorbent polymer particles 54 are sprayed and supplied by the superabsorbent polymer particle spraying means 90 on the filament aggregate 52Z. Later sent to Sarah 92. The tow is pulled out from the bale 52X by pulling in with the 1st-up 126A (corresponding to the drive-up roll).

[0253] Characteristically, the toe 52Y pulled out from the bale 52X is subjected to a change in the angle by the turn part 122 and then a pair of free-up rolls 124 configured to be freely rotatable. -The first pull-up 126A is pulled in through the pop-up. In such a configuration, the transfer resistance of the free-up roll 124 (determined according to the two-up pressure and the roll's own weight) also functions as a brake that suppresses the pull-in speed of the toe 52Y. The tension becomes stable. This is due to the fact that the rotation of the free rope 124 is generated only by the passage of the tow.

[0254] The free pressure and free weight of the free-roll 124 may be determined as appropriate. In normal cases, it is preferable that the double pressure is more than OMPa and 5 MPa or less. Book It is preferable to be more than Okg and not more than 10kg. Within this range, tension can be easily stabilized.

[0255] As a result, the supply amount of tow 52Y to the 1st-up 126A that controls the supply amount of tow becomes stable, and the size, weight, and quality of the absorber become stable.

[0256] Also, the tow 52Y pulled out from the bale 52X is between the bale 52X and the free-up roll 124, between the free-up roll 124 and the first-up 126A, and between the first-up 126A and the first. The widening device 120 provided between the 2-p 126B and between the 2-p 126B and the 3-p 126C is widened stepwise to a desired width. At this time, it can also be expanded in the thickness direction.

24 and 25 show an example 120 of a widening device. The widening device 120 includes a rectangular tube passage 120A having a predetermined width X through which the tow passes, and a compressed air jet outlet 120B formed on a surface along the width direction on the inner surface of the passage 120A. The tow 52 γ to be introduced is widened to the full width of the passage by the force of compressed air. The height of the passage is set to be equal to or greater than the thickness of the tow 52Y to be introduced, and when it is higher than the thickness of the tow 52Y, the tow 52Y is also expanded in the thickness direction.

[0258] As shown in FIG. 25, the spout 120B is line-symmetric with respect to the center in the width direction of the passage 120A, and has a dogleg shape that is located downstream in the toe passage direction toward the center in the width direction of the passage 120A. (Or V-shaped) It is a slit.

[0259] When the tow enters the passage 120A in such a state that the slit 120B force is also ejected, the tow 52Y receives the force of the compressed air in a well-balanced manner even if the approach position is shifted in the center force in the width direction. Thus, it escapes to the center in the width direction (in the direction of the arrow in FIG. 22), and the tow 52Y is naturally guided to the center in the width direction of the passage 120A. In other words, the introduction position of the toe 52Y can be centered using compressed air for widening. Further, in this embodiment, since the toe 52Y is guided in a non-contact manner, there is an advantage that damage and collapse of the tow are less likely to occur compared to the case where the toe 52Y is guided by contact. In addition, the widening device 120 having such a centering function exhibits not only centering in widening but also a function of correcting the transfer position.

[0260] When performing centering using compressed air as described above, the shape of the slit is a square shape. It is not limited to the shape of the passage, and is formed in a curved shape, an arc shape, etc. as long as it satisfies the condition of being line-symmetrical with respect to the center in the width direction of the passage 120A and being located downstream in the toe passage direction toward the center in the width direction of the passage 120A You can also.

[0261] On the other hand, tension is applied between the 1st-up 126A and the 2nd-up 126B so as to apply tension to the toe 52Y. The peripheral speed of each -up roll is set so as to be relaxed between As a result, tension is applied to the tow 52Y between the first-up 126A and the second-up 126B, so that the entanglement between the filaments is forcibly removed to some extent and the separation of the filaments is promoted. At the same time, the tow 52Y is widened by the widening device 120 along with the separation, so that the tow 52Y can be further uniformly widened. In addition, the toe 52Y is widened by the widening device 120 while the tow 52Y is relaxed between the 2-up 126B and the 3-up 126C. It becomes.

[0262] In a more preferred form, one roller of the second 2-p 126B is formed with a number of grooves that are continuous in the circumferential direction with small intervals in the longitudinal direction. This groove has the function of promoting tow unraveling by allowing the filament to enter a large number of grooves. Further, in this case, in order to enhance the effect of the groove, the holding angle of the toe 52Y (the rotation direction angle of the toe contact portion) in one of the grooved rollers of the 2-up 126B is increased, and the toe 52Y and the grooved roller are increased. It is also a preferable form to increase the contact area. Specifically, the angle between the tow 52Y on the upstream side of the 2-p 126B and the tow 52Y on the downstream side, that is, the direction change angle by the grooved roller is less than 180 degrees, especially acute angle (smaller than 90 degrees) It is preferable to constitute so that.

[0263] The first-up 126A, the second-up 126B, and the third-up 126C may have different combinations of roll diameters. The force applied to the tow 5 2Y between the rolls and the contact resistance between the roll and the toe 52Y may cause unevenness in the toe width direction.

[0264] Next, the tow that has passed through the 3-p 126C is guided to the thickening device 110. The thickening device 110 has a structure similar to that disclosed in, for example, Japanese Patent Laid-Open No. 59-500422 (WO 83/03267), and schematically shows an inlet 110A and an outlet 110B as shown in FIG. A bench lily part 110b is formed between and the inlet side of the pressurized air 110a. In addition, the bench lily part 110b has an air exhaust hole 110c. In plan view, it is almost rectangular and flat in the direction penetrating the page of FIG.

[0265] When the compressed air is blown from the blowing port 110a, air enters from the inlet 110A due to the ejector effect, and as a result, the tow 52Y is drawn and given a forward force. When the toe 52Y reaches the bench lily part 110b, the air is exhausted from the air exhaust hole 110c, and the space of the bench lily part 110b is expanded, so the bulk of the toe 52Y mainly increases in the thickness direction. The thickness is enlarged. In addition, by making the width of the passage wider than the width of the tow 52Y to be introduced, the width can be increased as shown in the lower part of FIG. The tow can be opened with force.

[0266] (SAP supply equipment)

As the SAP supply device 90, it is preferable to disperse the superabsorbent polymer particles substantially in the entire thickness direction with respect to the filament aggregate 52Z. As such a superabsorbent polymer particle spraying means 90, not only a dropping force due to its own weight but also an accelerating force is desirable. An example of this is shown in FIG. That is, a rotating drum 90b having a projection hole 90d in a casing 90a having an opening in the lower part is configured to rotate in the moving direction of the web (counterclockwise in FIG. 27), and a shatter drum 90c is provided therein. It is what was done. The projection unit 90A having these elements is connected to a hopper that stores superabsorbent polymer particles, and the superabsorbent polymer particles 54 having a hopper force are configured to be supplied into the rotating drum 90b! RU

[0267] In this SAP supply device, the position of the opening of the shatter drum 9 Oc is adjusted in advance with respect to the opening position of the casing 90a. In the state of Fig. 27, the fully opened state is shown. Further, the projection hole 90d of the rotating drum 90b is divided into four groups in the circumferential direction as shown in the drawing as a group divided in the circumferential direction. Therefore, in the process shown in the drawing, four sheets of disposable diapers are rotated. The superabsorbent polymer particles are sprayed and projected on the surface.

[0268] The superabsorbent polymer particles 54 may be continuously dispersed and projected onto the aggregate of the filaments 52, but the absorbent element 50 is divided in the line direction by the cutter device 94, and the individual absorbent elements 50 and The blades of the cutter device 94 can be shortened due to the presence of superabsorbent polymer particles 54 It will wear out. Therefore, it is desirable to disperse and project only the zone Z intermittently, as shown in FIG. 27, instead of continuously dispersing and projecting the superabsorbent polymer particles 54.

[0269] For this reason, as described above, the projection hole 90d of the rotary drum 90b is divided into four groups in the circumferential direction as shown in FIG. The polymer particles 54 are intermittently scattered and projected only in the zone Z. As a result, the zone Z and Z can be divided by the cutter device 94, and the blade wear of the cutter device 94 can be suppressed.

[0270] The amount of the superabsorbent polymer particles sprayed can be adjusted mainly by adjusting the opening size of the shatter drum 90c relative to the opening position of the casing 90a, and the size of the projection hole 90d. In addition, the position of the opening is preferably followed. The dispersion pattern of the superabsorbent polymer particles can be adjusted by the arrangement of the divided projection holes 90d.

[0271] On the other hand, if necessary, the superabsorbent polymer particles 54 can be substantially scattered on the aggregate of filaments by spraying and projecting the superabsorbent polymer particles 54 on the aggregate of filaments 52 together with pressurized air. It is also possible to disperse in the entire thickness direction. However, the superabsorbent polymer particles sprayed onto the aggregate of filaments 52 may be scattered by the pressure air and scattered outside the specified area.

[0272] Furthermore, the superabsorbent polymer particles 54 dispersed on the filament aggregate may be sucked from below the filament aggregate together with or instead of the SAP supply device 90.

[0273] Further, instead of the SAP supply device 90 that applies the centrifugal component force described above, a general-purpose SAP supply device that simply drops the superabsorbent polymer particles by its own weight may be used.

(Pants-type use, example of a disposable diaper)

[0275] FIG. 28 shows an example of a pants-type disposable diaper. This pants-type disposable diaper 10 includes an outer surface (back surface) side exterior sheet 12 and an inner surface (front surface) side absorbent main body 20, and the absorbent main body 20 is fixed to the exterior sheet 12. Absorbent body 20 is soft urine It is the part that receives and absorbs fluid such as feces (menstrual blood in the case of sanitary napkins described later). The exterior sheet 12 is a part for attaching to the wearer.

[0276] The exterior sheet 12 has, for example, an hourglass shape as shown in the figure, and both sides are constricted, and this is a part into which the wearer's leg is inserted. Absorbent body 20 can take any shape

In the illustrated form, it is rectangular.

[0277] As shown in Fig. 29, the exterior sheet 12 is folded back and forth after the absorbent main body 20 is installed and fixed in place, and both sides of the front body 12F and the back body 12B of the exterior sheet 12 The joining region 12A is joined by heat fusion or the like. As a result, a pants-type disposable diaper having a structure shown in FIG. 28 and having a waist opening WO and a pair of redder openings LO is obtained.

[0278] The intermediate width in the longitudinal direction of the absorbent main body 20 shown in the figure (that is, the vertical direction in Fig. 29, which is also the front-rear direction of the product) is shorter than the width connecting the constricted portions of the exterior sheet 12. It has been. This width relationship may be reversed or the same width.

[0279] The exterior sheet 12 is preferably composed of two sheets of water-repellent nonwoven fabric, for example, and an elastic elastic member is interposed between these sheets, and the outer sheet 12 is desirably fitted to the wearer by its contraction force. As the elastic elastic member, thread rubber or elastic foam band can be used, but it is desirable to use a large number of thread rubbers. In the illustrated form, the rubber threads 12C, 12C,... Are continuously provided in the width direction in the waist region W, provided only on both sides in the waist region U, and provided in the crotch region L. Absent. The rubber thread 1 2C, 12C ... is provided in both the waist region W and the lower waist region U, so that even if the elastic force of the thread rubber 12C itself is weak, the wearer also in the lower waist region U as a whole The product fits the wearer well.

[0280] (Absorbent body)

As shown in FIG. 30, the absorbent main body 20 according to the embodiment includes a top sheet 30 having a force such as a non-woven fabric that allows liquid to pass therethrough, an intermediate sheet (second sheet) 40, and an absorbent element 50. Further, a liquid-impermeable sheet 70 having a force such as a plastic sheet is provided on the back side of the absorber 56. An exterior sheet 12 is provided on the back side of the liquid-impermeable sheet 70. In addition, it is equipped with barriers 60, 60 on both sides. [0281] (Top sheet)

The top sheet 30 has a property of transmitting liquid. Therefore, the material of the top sheet 30 is sufficient if it exhibits this liquid permeability, and examples thereof include a porous or non-porous nonwoven fabric and a porous plastic sheet. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, polyolefins such as polyethylene and polypropylene, synthetic fibers such as polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers in which two or more of these are used. It can be illustrated. Further, the non-woven fabric may be manufactured by any kind of cage. Examples of the processing method include known methods such as a spun lace method, a spun bond method, a thermal bond method, a melt blown method, a needle punch method, and the like. For example, the spun lace method is a preferable processing method for obtaining flexibility and drape, and the thermal bond method is for obtaining bulkiness and softness.

[0282] The top sheet 30 may be composed of a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the plane direction.

[0283] (Intermediate sheet)

In order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent body, an intermediate sheet 40 called “second sheet” can be provided. This intermediate sheet quickly transfers the liquid to the absorber to enhance the absorption performance by the absorber, preventing the “reversal” phenomenon of the absorbed liquid from the absorber by force and always drying the top sheet 30 It can be made into the state which carried out.

[0284] Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spun lace, pulp non-woven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.

[0285] The intermediate sheet (second sheet) 40 is interposed between the top sheet 30 and the covering sheet 58. As shown in FIG. 32, a configuration without the intermediate sheet (second sheet) 40 can also be used. Further, although not shown, it may be arranged between the covering sheet 58 and the absorber 56. [0286] The intermediate sheet 40 in the form shown in the figure is arranged in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56, or may be within a short or long range centered on the region for receiving the liquid. A typical material for the intermediate sheet 40 is a nonwoven fabric excellent in liquid permeability.

[0287] (Liquid impervious sheet)

The liquid-impermeable sheet 70 is a sheet disposed on the back side of the absorber 56. The material of the liquid-impermeable sheet is not particularly limited. For example, an olefin-based resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet, or a waterproof film is interposed. For example, a non-woven fabric that is substantially impervious to liquid (in this case, a waterproof film and a non-woven fabric constitute a liquid-impermeable sheet) can be used. Of course, in addition to this, a material having liquid-impervious and moisture-permeable properties, which has been preferred in recent years from the viewpoint of preventing stuffiness, can also be used. As a sheet of this liquid-impervious and moisture-permeable material, for example, an inorganic filler is kneaded in an olefin-based resin such as polyethylene or polypropylene, the sheet is formed, and then stretched in a uniaxial or biaxial direction. Examples of the microporous sheet obtained as described above.

[0288] In order to prevent so-called side leakage, the liquid-impermeable sheet 70 can be wound around both sides of the absorber 56 to extend to the use surface side (not shown). In the form, side leakage is prevented by interposing the second liquid-impermeable sheet 72 between the double barrier sheets 64 forming the NORY cuff 60. According to this configuration, the second liquid impervious sheet 72 extends until the barrier cuff 60 is erected! /, So that the liquid diffused laterally through the top sheet 30 and the barrier one-piece hull 60, There are 禾 lj points to prevent side leakage of loose stool between 60.

[0289] (Barrier first effort)

Barrier force bars 60, 60 provided on both sides of the product are provided to prevent urine and soft stool that move laterally along the top sheet 30 and prevent side leakage. In particular, in the third embodiment, since the expansion of both sides of the crotch portion is suppressed, the substantial standing height of the pariya cuff does not decrease, the amount of damming is reduced, and the followability to the body surface is improved. It is preferable to provide Norriya cuffs 60 and 60, since it is difficult for the decrease to occur. However, it is needless to say that Noriya cuffs are an optional element and can be omitted.

[0290] The illustrated noir cuff 60 is formed by duplicating a water-repellent nonwoven fabric sheet, and covers the folded portion from the back surface side of the absorbent body 56 to the lower side of the top sheet 30, and protrudes to the front surface side. Formed like! In order to prevent the urine from moving on the top sheet 30 in the lateral direction, in particular, the side cuff of the liquid-impermeable sheet 70 is inserted between the double nonwoven fabric sheets, and the noir cuff protruding from the surface side 60 It extends to the middle.

[0291] The force of the barrier first force hose 60 itself can be designed as appropriate. In the example shown in the figure, an elastic elastic member, for example, rubber thread 62 is stretched at the tip and middle of the protrusion of the barrier force hose 60. It is fixed underneath, and in the state of use, the Norriya cuff 60 stands up due to its contraction force. As shown in Fig. 30, the base part of the noir cuff 60 is arranged so that the middle thread rubber 62 is positioned closer to the center than the front thread rubbers 62, 62 and fixed to the front and rear ends of the top sheet 30. The side rises obliquely toward the center side, and the tip portion rises obliquely outward from the intermediate portion.

[0292] In particular, in the barrier one-piece hoop 60 shown in FIG. Although it is fixed in a stretched state along the front-rear direction, in the present invention, since the increase in rigidity of the crotch both sides 56S is suppressed even after absorption, the elasticity of the rubber thread 63 is sufficiently exerted, and the leg circumference In addition, good fit can be obtained.

[0293] (Embossed)

You may form the recessed part E by embossing from the surface side of the top sheet 30 to the thickness direction. In this case, in addition to forming the embossed recess E only in the top sheet 30, as shown in FIG. 34, the embossed recess E can be formed in both the top sheet 30 and the intermediate sheet 40, or the top sheet 30 A concave portion by embossing can be formed (not shown) so as to reach part or substantially the whole thickness direction of the absorber 56 from the surface side. In order to form the recess E by embossing in both the top sheet 30 and the intermediate sheet 40, the intermediate sheet 40 has a basis weight of 8 to 40gZm ² , a thickness of 0.2 to 1.5mm, and a top sheet 30. As the basis weight is 15 to 80 gZm ² and the thickness is in the range of 0.2 to 3.5 mm, it is desirable in terms of sufficient embossing force on conditions that do not impair liquid permeability! /, . [0294] Further, the embossed recess may be formed only on the intermediate sheet 40 without forming a recess in the top sheet 30, and the recess may be formed in the top sheet 30 and the intermediate sheet 40. A concave portion by embossing may be formed only in 56, or a concave portion by embossing may be formed only in the absorbent body 58 without forming concave portions in the top sheet 30, the intermediate sheet 40 and the covering sheet 58.

[0295] The recess E has an effect of inducing and diffusing the liquid in the extending direction. Therefore, when the recess E is substantially continuous in the shape of a groove (including the case where a plurality of recesses are arranged in a row at intervals to form a single groove), the liquid is allowed to reach the surface side layer before reaching the absorber. It spreads through the concave part E, and a wider part of the absorber can be used for absorption. Therefore, the absorbent capacity of the entire product is increased, and the absorbent article is less likely to leak from the side or return due to insufficient absorbent capacity.

[0296] On the other hand, the absorber 56 made of tow tends to have lower rigidity than the conventional pulp material, but it is preferable to form a concave portion by embossing in the absorber 56 because the rigidity can be increased. Although not shown, in order to increase the rigidity of the absorbent element 50, it is also a preferred form to form a concave portion by embossing in the thickness direction from the back surface side (the side opposite to the top sheet 30 side) of the absorber 56. In order to form the concave portion on the back surface side, the embossing force is integrated so as to reach the absorber 56 from the back surface side of the holding sheet 80, the covering sheet 58, the liquid-impermeable sheet 70 or the exterior sheet 12. Can be applied. Further, such a recess on the back surface side is preferably formed together with the recess E on the front surface side, but it is also possible to form only the recess on the back surface side without forming the recess E on the front surface side. When the recesses are provided on both the front and back sides, the shape of the recesses may be common to the front and back sides, or the front and back sides may be different.

[0297] The concave portion formed by embossing has the effect of inducing and diffusing liquid in the extending direction. It also has the effect of increasing rigidity. Therefore, it is desirable that the shape of the embossed recess is determined in consideration of these effects. For example, the recesses are substantially continuous in the shape of a groove (including the case where a plurality of recesses are arranged in a row and form a single groove), and the plurality of recesses are in the form of dots at intervals. It may be arranged. In addition, as the planar pattern, groove-shaped or dot-shaped concave portions are arranged in the longitudinal direction, the width direction, a lattice shape combining these, a zigzag shape (zigzag shape) reciprocating in the width direction, or irregularly arranged. Can take form, etc. wear. Furthermore, appropriate forms such as a pin shape, a Mt. Fuji shape, and a bellows shape can be adopted.

[0298] (Absorbing element)

The absorbent element 50 is composed of an absorbent body 56 having an aggregate of filaments 52, 52, and a superabsorbent polymer single particle 54, 54, which are opened tow, and at least the back and side surfaces of the absorbent body 56. And a covering sheet 58 to be wrapped. Further, a holding sheet 80 is provided between the absorbent body 56 and the rear surface side portion (lower portion) of the covering sheet 58.

[0299] (Aggregation of filaments)

The absorber 56 has an aggregate of filaments 52, 52. The aggregate of the filaments 52, 52... Is obtained by opening a tow that is a bundle of substantially continuous filaments. Examples of tow fibers include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactamamide, polybutyrate, etc.). Force that can be produced In particular, cellulose ester and cellulose are preferred.

[0300] As cellulose, cellulose derived from plants such as cotton, linter and wood pulp, butterfly cellulose, etc. can be used. Regenerated cellulose, which may be regenerated cellulose such as rayon, is a spun fiber. Moyo.

[0301] Examples of cellulose esters that can be suitably employed include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more. The viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800. The average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).

[0302] The average degree of polymerization of the cellulose ester can be, for example, about 10 to 1000, preferably about 50 to 900, more preferably about 200 to 800, and the average degree of substitution of the cellulose ester is, for example, about 1 to 3. , Preferably 1 to 2.15, more preferably about 1.1 to 2.0 be able to. The average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.

[0303] As the cellulose ester, an organic acid ester (for example, an ester with an organic acid having about 2 to 4 carbon atoms), particularly cellulose acetate is suitable. The acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability. A particularly preferred cellulose ester is cellulose diacetate.

[0304] The tow constituting fiber may contain various additives such as a heat stabilizer, a colorant, an oil, a yield improver, a whiteness improver and the like.

[0305] The fineness of the tow constituting fiber is, for example, 1 to 16 dex, preferably 1 to: LOdex, and more preferably 1 to 5 dex. The tow constituent fiber may be a non-crimped fiber, but is preferably a crimped fiber. The crimping degree of the crimped fibers can be, for example, about 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 highly integrated tow can be easily produced by entanglement between the fibers. The cross-sectional shape of the toe-constituting fiber is not particularly limited, and may be any one of, for example, a circular shape, an oval shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. May be. The tow-constituting fiber is composed of, for example, 3,000 to 1,000,000 tow (fiber bundle) formed by bundling single fibers of about 5,000 to 1,000,000. Can be used in form. The fiber bundle is preferably formed by bundling about 3,000 to 1,000,000 continuous fibers.

[0306] The tow is weak in entanglement between fibers! /, So a binder having an action of adhering or fusing the contact portion of the fiber can be used mainly for the purpose of maintaining the shape. Examples of the noda include ester plasticizers such as triacetin, triethylene glycol diacetate, triethylene glycol dipropionate, dibutyl phthalate, dimethoxyethyl phthalate, and citrate triethyl ester, as well as various types of resin adhesives, particularly thermoplastic resins. Fats can be used.

[0307] Thermoplastic resin used as a binder exhibits adhesive strength by melting and solidifying. It is a rosin and includes water-insoluble or poorly water-soluble rosin and water-soluble rosin. Water-insoluble or poorly water-soluble rosin and water-soluble rosin can be used in combination as necessary.

[0308] Examples of water-insoluble or poorly water-soluble resins include polyethylene or polypropylene, ethylene propylene copolymer, ethylene olefin homopolymer or copolymer such as ethylene acetate butyl copolymer, poly (butyl acetate), poly (methacrylic acid). Acrylic resin such as methyl, methyl methacrylate-acrylic acid ester copolymer, copolymer of (meth) acrylic monomer and styrenic monomer, polyvinyl chloride, butyl acetate butyl copolymer, polystyrene Styrene polymers such as copolymers of styrene monomers and (meth) acrylic monomers, polyesters that may be modified, polyamides such as nylon 11, nylon 12, nylon 610, nylon 612, rosin derivatives ( For example, rosin ester), hydrocarbon resin (for example, terpene resin) Dicyclopentadiene 榭脂, petroleum 榭脂), such as hydrogen added hydrocarbon 榭脂 can be used. These thermoplastic rosins can be used singly or in combination.

[0309] The water-soluble rosin has various water-soluble polymers such as polybulal alcohol, polypyrrole pyrrolidone, polybull ether, bulll monomer, and carboxyl group, sulfonic acid group or a salt thereof. Vinyl water-soluble resins such as copolymers with copolymerizable monomers, acrylic water-soluble resins, polyalkylene oxides, water-soluble polyesters, water-soluble polyamides, and the like can be used. These water-soluble coagulants can be used alone or in combination of two or more.

[0310] Various additives such as stabilizers such as antioxidants and UV absorbers, fillers, plasticizers, preservatives, and antifungal agents may be added to the thermoplastic resin.

[0311] However, the use of binder components that inhibit penetration of superabsorbent polymer particles should be avoided whenever possible. It is best not to use binder components that inhibit the entry of superabsorbent polymer particles.

[0312] The tow can be produced by a known method and will not be described in detail. Cellulose diacetate tow bale that can be suitably used for the absorbent element 50 is commercially available from Cera-Izu Co., Ltd. Daicel Chemical Industries. Cellulose diacetate tow bale has a density of about 0.5 gZcm ³ and a total weight of 400-600 kg. [0313] From this bale, the tow is peeled off and spread into a wide band so as to have a desired size and bulk. The opening width of the tow is arbitrary, and may be, for example, a width of 100 to 2000 mm, preferably about 100 to 300 mm, which is the width of the product absorber. In addition, the density of the absorbent can be adjusted by adjusting the degree of tow opening.

[0314] Examples of the method for opening the tow include a method in which the tow is spread over a plurality of opening rolls and the tow is gradually expanded as the tow progresses, and the tow tension (elongation) is used. For example, a method of repeatedly opening and relaxing (shrinking) and a method of widening and opening using compressed air can be used.

[0315] (Superabsorbent polymer particles)

Absorber 56 has superabsorbent polymer particles 54, 54. The superabsorbent polymer particle 54 is meant to include “powder” in addition to “particle”. As the particle diameter of the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, and those of 100 to 1000 / ζ πι, particularly 150 to 400 / ζ πι are desirable. If the particle size is too small, it is not preferable because it is easy to move in the absorber 56 and the scattering loss in the production line increases. Also, if the particle size is too large, the harsh texture becomes noticeable and the product value may be reduced. As the material of the superabsorbent polymer particles, those having a force water absorption amount of 60 gZg or more that can be used without particular limitation are suitable. Superabsorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based particles such as starch acrylic acid (salt) daraf copolymer, starch-acrylonitrile copolymer ken-yi, and sodium carboxymethyl cellulose. Cross-linked products and acrylic acid (salt) polymers can be used. As the shape of the superabsorbent polymer particles, a force in which a commonly used granular material is suitable may be used in other shapes.

[0316] As the superabsorbent polymer particles 54, those having a water absorption speed of 0 second or less are preferably used. When the water absorption speed exceeds 40 seconds, the liquid supplied into the absorbent body is likely to cause a so-called reversal that returns to the outside of the absorbent body.

[0317] Further, as the superabsorbent polymer particles 54, those having a gel strength of lOOOPa or more are preferably used. Thereby, even if it is a case where it is set as a bulky absorber by using tow | toe, the stickiness after liquid absorption can be suppressed effectively. [0318] The basis weight of the superabsorbent polymer particles 54 can be appropriately determined according to the amount of absorption required for the use of the absorber. Therefore, although it cannot be said unconditionally, it can be 50 to 350 gZm ² on the average of the absorbent element 50 as a whole. By making the basis weight of the polymer 50gZm ² or more, it is possible to prevent the thinning and light weight effect that is obtained by adopting the aggregate of filaments that are also tuka by the absorption capacity of the polymer. it can. 3 Above 50 gZm ² , the excess of superabsorbent polymer particles that saturate the effect will give a crisp feel.

[0319] (Absorber size'weight)

On the other hand, the size of the absorber 56 is preferably a plane projection area force of OOcm ² or more and a thickness of 1 to 10 mm, particularly 1 to 5 mm. When the size of the absorber is within this range, it is extremely advantageous for improving the resilience without increasing the weight, thickness and cost. Further, it is preferable that the weight of the absorber is 25 g or less, particularly 10 to 20 g. Absorber weight force S Within this range, the advantage of not using a special member becomes particularly significant.

[0320] (Compression characteristics of absorber)

The compression resilience RC of the absorber 56 is preferably 40 to 60%, particularly 50 to 60%. Thereby, sufficient restoring property can be exhibited with the absorber itself.

[0321] Furthermore, it is preferable that the compression energy WC of the absorber 56 is 4.0 to: LO. Ogf 'cmZcm ² because it can be compacted to the same level or higher when packaging.

[0322] These compression characteristics can be adjusted by adjusting the fiber density of the aggregate of filaments by opening, etc., selecting the fiber material, selecting the type of binder such as a plasticizer, or adjusting the degree of processing, or a combination of these. Etc. can be adjusted.

[0323] Here, the compression energy (WC) is the amount of energy consumed when pressing the center of a test piece (holding sheet) cut to a length of 200mm and a width of 50mm up to 50g.

[0324] This compression energy can be measured by a handy compression tester (KES-G5, manufactured by Kato Tech). The measurement conditions with this tester are: SENS: 2, force gauge type: lkg, SPEED RANGE: STD, DEF sensitivity: 20, pressurization area: 2cm ² Included Interval: 0. 1 (standard), STROKE SET: 5. 0, the upper limit load: a 50gfZcm ^2.

[0325] On the other hand, compression resilience (RC) is a parameter that represents the recoverability when a fiber is compressed. Therefore, if the recoverability is good, the compression resilience increases. This compression Les Jiriensu can by handy compression tester _(KE s-G5, manufactured by Kato Tech Co., Ltd.), is measured. The measurement conditions for this tester are the same as for the compression energy.

[0326] (Enveloping sheet)

As the covering sheet 58, tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylamy, a sheet with small holes, etc. can be used. However, it is desirable that the sheet does not allow the superabsorbent polymer particles to be extracted. When using non-woven fabric instead of crepe paper, hydrophilic MSMS (spunbond Z meltblown Z meltblown Z spunbond) non-woven fabric is particularly suitable, and polypropylene, polyethylene zpolypropylene, etc. can be used as the material. The basis weight is preferably 8 to ²⁰ g / m ² , particularly 10 to 15 g / m ² .

[0327] As shown in Fig. 30, this covering sheet 58 has a force in a form of wrapping the aggregate of the filaments 52, 52 ··· and the entire layer of the superabsorbent polymer particles 54, 54 ··· As shown in 31, only the back and side surfaces of the layer may be covered. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with a crepe paper nonwoven fabric, the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with a crepe paper nonwoven fabric. The side surface and the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a constituent element of the enveloping sheet). If necessary, the aggregates of the filaments 52, 52... And the superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or disposed only on the lower surface.

[0328] (Distribution of superabsorbent polymer, etc.)

In the present invention, the main absorbent portion 56C, which is a portion other than the both side portions 56S, 56S of the crotch portion, has the superabsorbent polymer particles 54, 54, and the crotch portion is compared with the main absorbent portion 56C. Both sides 56S and 56S are considered to be parts with a low basis weight of the superabsorbent polymer particles! The crotch part, the front part and the rear part of the crotch part can be, for example, the middle, front side, and rear side when the absorbent body 56 is divided into three in the front-rear direction. Crotch both sides 56S, one side May be a portion having a width of 5 to 40% of the width of the absorber 56, for example.

[0329] Thus, in the present invention, the dispersion density of the superabsorbent polymer particles 54 is different between the main absorbent portion 56C and the both side portions 56S, 56S of the crotch portion. In other words, both side portions 56S and 56S of the crotch portion are also referred to as low density portions.

[0330] The positions, dimensions, and shapes of the low-density portions 56S, 56S may be appropriately determined within the scope of the present invention. For example, the position in the front-rear direction is preferably a position straddling the center line in the front-rear direction of the article. It is preferable that the length m is 50 to 300 mm and the width n is 10 to 100 mm.

[0331] The shape of the low-density portions 56S, 56S is preferably a portion surrounded by a line extending from the front-rear direction center side to the width-direction center side rather than the front-rear direction ends, for example, as shown in FIG. Such a portion surrounded by a substantially arc-shaped curve along the circumference of the leg, or a substantially trapezoidal portion as shown in FIG.

[0332] The basis weight of the superabsorbent polymer particles 54 in the low density portion 56S can be determined as appropriate. For example, the basis weight of the aggregate of the filaments 52 is set to 30 to 300 gZm ² and the basis weight of the superabsorbent polymer particles 54 is determined. When the average of the entire absorbent element 50 is 50 to 350 gZm ² , it is preferably 100 g / m ² or less. In particular, it is preferable that the low density portion 56S has substantially no structure, for example, by not arranging the superabsorbent polymer particles 54 at the time of manufacture.

[0333] The superabsorbent polymer particles 54 may be non-fixed, but in that case, depending on the manufacture, transportation, and use of the product, the superabsorbency of other parts with respect to both sides 56S, 56S of the crotch The polymer single particle 54 may move and the effect may be diminished. Therefore, it is preferable that a part or all of the superabsorbent polymer particles 54 be bonded and fixed to the assembly of filaments 52 and the covering sheet 58. FIG. 45 assumes the case where the superabsorbent polymer particles 54 are bonded to the aggregate of filaments 52 via the adhesive HM. An adhesive for fixing the superabsorbent polymer particles 54 A hot melt adhesive can be suitably used as the HM. Further, as a method for applying the adhesive HM, the coating amount for which curtain coating is preferred is ² to 15 g / m ² , and the preferred coating region is preferably slightly wider than the main absorbent portion.

[0334] The distribution of the superabsorbent polymer particles 54 in the thickness direction of the absorber 56 is not particularly limited, and may be provided not on the filament 52 assembly but on the back surface side of the filament 52 assembly. Force As shown in FIG. 30, it is desirable that the superabsorbent polymer particles 54 are dispersed substantially throughout the thickness direction of the absorbent body 56. This state of being dispersed substantially throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG.

[0335] If there is no or very little SAP particles in the upper, lower, and middle parts of the absorber 56, it cannot be said that "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “uniformly distributed” in the upper, lower, and / or middle portions of the aggregate of the filaments 52 in addition to the form “uniformly” distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle parts. In addition, a form in which some SAP particles do not enter the aggregate of filaments 52, 52, but remain on the surface, and some SAP particles collect in the filament filaments 52, 52, Neither the form passing through the coalescence on the covering sheet 58 nor the form on the holding sheet 80 as shown in FIG. 33 is excluded.

[0336] (Retaining sheet)

It is preferable to provide a holding sheet 80 for holding the superabsorbent polymer particles 54 on the back side or the skin side of the absorbent body 56. As described above, the superabsorbent polymer particles 54 pass through the assembly of filaments 52 or between the assembly of filaments 52 and the enveloping sheet 58 during the manufacturing process or until the consumer uses them. It may move within the absorber 56 due to passing through. In addition, the unevenness of the superabsorbent polymer particle group gives a sense of incongruity when touched by the hand when the consumer uses it. Therefore, a holding sheet 80 for holding the absorbent polymer particles 54 is interposed on the back surface side or the skin surface side of the absorber 56.

[0337] In FIG. 33, when the superabsorbent polymer particles are provided below the absorber 56, or the superabsorbent polymer particles contained in the absorber 56 are used by the consumer in terms of manufacturing power. Until then, the case where the collective force of the filaments 52 is also released and gathered on the holding sheet 80 is conceptually shown.

[0338] Even if the holding sheet 80 is provided only below the absorber 56 as shown in Fig. 30 or the like, the holding sheet 80 passes through the side surface of the absorber 56 and is rolled up to the upper surface of the absorber 56 as shown in Fig. 33. You can extend it. Not shown !, but the holding sheet 80 is covered with the covering sheet 58 on the surface side and the absorbent body 56 on the skin side. You may arrange | position between surfaces. It is also possible to use a plurality of holding sheets 80 in a stacked manner. However, since the holding sheet 80 holds the polymer particles 54, if the holding sheet 58 has the covering sheet 58, it should not be outside the covering sheet 58, and the absorbent body 56 and the covering sheet 58 A holding sheet 80 is provided between them.

[0339] In particular, as a structure that can most effectively suppress the movement of the superabsorbent polymer particles, the superabsorbent polymer particles 54 are unevenly distributed between the holding sheet 80 and the aggregate of the filaments 52, and thus the superabsorbent polymer particles are highly absorbable. A structure in which the polymer particles 54 are fixed to at least one of the holding sheet 80 and the filament aggregate by the adhesive HM can be given.

[0340] The material of the holding sheet 80 is not particularly limited as long as it has an ability to hold absorbent polymer particles. Specifically, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with water repellent or water repellant, etc.) In addition to polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber, etc., a resin film or paper can also be used.

[0341] When the holding sheet 80 is a non-woven fabric, the holding sheet 80 has a compression energy based on the KES test of 0.01 to: LO. 00 gfcm / cm ² , preferably 0.01 to: L OOgfcm / cm ² And a compression resilience of 10 to 100%, preferably 70 to 100%.

[0342] In particular, in order to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80, a hot-melt adhesive or the like is applied on the holding sheet 80 in advance, and the superabsorbent polymer particles 54 are placed on the holding sheet. Adhesion to 80 is preferred.

[0343] In addition, the holding ability can be improved by making the upper surface (the surface facing the use surface side) of the holding sheet 80 rough or fluffed. Examples of the roughening or fluffing method for this purpose include marble force and brushing cache.

Furthermore, as shown in FIG. 46, it is also a preferred form that a large number of holding holes 81 are formed in the holding sheet 80 in the form of dots. The holding holes 81 may be regularly arranged or irregularly arranged. The holding hole 81 may be a hollow hole that does not penetrate the sheet 80 or may be a through hole. With such holding holes 81, superabsorbent polymer particles 54 are held. By being trapped in the hole 81, the movement is suppressed.

[0345] The size and number of the holding holes 81 can be appropriately determined. The opening area of the holding holes 81 is preferably ³ to 25 mm ² and the number per unit area is preferably 5000 to 50000 Zm ² . Is preferred.

[0346] As a method for forming the holding hole, as one that does not depend on the sheet material, embossing force can be cited. In addition, when the sheet is a non-woven fabric, a relatively large opening portion as shown in FIG. Thus, it is possible to manufacture the holding sheet 80 in which the recessed hole-shaped holding holes 81 are formed.

[0347] When a holding sheet having holding holes is used, the main absorbing portion 56C is applied to both sides of the crotch portion 56S, 56S by arranging the holding sheet with the holding holes formed entirely on the portion that overlaps the main absorbing portion 56C. The movement of the superabsorbent polymer particles 54 can be efficiently suppressed. The same holds true if the holding hole is formed only in the portion of the holding sheet 80 that overlaps the main absorbent portion 56C.

[0348] (Use of adhesives in the absorbent body)

When the superabsorbent polymer particles 54 are bonded to the assembly of filaments 52 and the holding sheet 80 by an adhesive, if the adhesive is present on both sides of the crotch 56S, 56S, the adhesive increases the rigidity and the crotch There is a risk of impairing the fit. Therefore, as shown in FIG. 45, the adhesive HM for fixing the superabsorbent polymer particles 54 is preferably applied only to the main absorbent portion 52C. While suppressing the movement of the superabsorbent polymer particles 54 by adhesion, it is difficult to impair the fit in the crotch region. In this case, as long as the adhesive HM is applied only to the main absorbent portion 52C, it may be applied to substantially the entire main absorbent portion 52C or to a part thereof.

[0349] (Others)

Although not shown, the constituent members of the absorbent main body 20 are fixed to each other by a solid such as a hot melt adhesive, a bead, a spiral, or a summit coating.

[0350] (Example of tape-type disposable diapers)

35 and 36 show examples of tape-type disposable diapers. Fig. 36 shows Fig. 35 The force-absorbing main body 20 shown in FIG.

[0351] The tape-type disposable diaper 10A has fastening pieces attached to both end portions on the back side of the diaper, has a hook element on a fastening surface of the fastening piece, and constitutes the back surface of the diaper. A diaper in which a backsheet is a non-woven laminate, and the hook element of the fastening piece can be engaged with an arbitrary portion of the surface of the backsheet when the diaper is mounted.

[0352] The absorbent main body 20 has an absorbent body 56 interposed between a top sheet 30 and a liquid-impermeable sheet 70. The absorbent body 56 is entirely wrapped with a covering sheet 58 made of tissue paper, and has a rectangular shape in plan view. A holding sheet 80 is provided between the absorbent body 56 and the covering sheet 58.

[0353] Further, an intermediate sheet 40 is interposed between the top sheet 30 and the absorber 56. The liquid-impermeable sheet 70 has a rectangular shape wider than the absorbent body 56, and a back sheet 12A made of an hourglass-shaped non-woven fabric is provided on the outer side thereof.

[0354] The top sheet 30 has a rectangular shape wider than the absorbent body 56, extends slightly outward from the side edge of the absorbent body 56, and is fixed to the liquid-impermeable sheet 70 with a hot melt adhesive or the like.

[0355] On both sides of the diaper, barrier one-force hulls 60A projecting to the use surface side are formed. It is composed of a member, for example, one or a plurality of leg rubber elastic elastic members for the leg elastic force. 130 is a fasting piece with a hook-and-loop fastener.

[0356] The inner surface of the NORY sheet 64 has a fixing start at a position separated from the side edge of the top sheet 30, and this fixing start edge also extends to the extending edge of the liquid-impermeable sheet 70 outward in the width direction. Part is fixed with hot melt adhesive. The outer surface of the liner sheet 64 is fixed to the back sheet 12A with a hot melt adhesive on the lower surface thereof. Further, an elastic expansion / contraction member for gasket cuff, for example, rubber thread 66 is provided.

[0357] The starting end of the inner surface of the NORY sheet 64 attached to the liquid-impermeable sheet 70 forms the upright end of the NORY cuff 60A. Around the leg, the inside of the standing end is the product body It is a free part that is not fixed to the thread, and this free part comes to stand by the contraction force of the rubber thread 62.

[0358] In this example, by using a hook-and-loop fastener as the fastening piece 130, it can be mechanically fixed to the back sheet 12A. Therefore, the so-called target tape can be omitted, and the fastening position by the fastening piece 130 can be freely selected.

[0359] The base of a fasting base material such as plastic, polylaminated nonwoven fabric, or paper is joined to the backsheet 12A by, for example, an adhesive, and the hooking piece 130 has a hook element 130A on the tip side. The hook element 130A is bonded to the fastening substrate with an adhesive. The hook element 130A has a large number of engaging pieces on the outer surface side thereof. A temporary fixing adhesive portion 130B is provided on the tip side from the hook element 130A. At the end of the assembly of the product, the temporary fixing adhesive portion 130B is adhered to the force barrier sheet 64 to prevent peeling of the front end side of the fastening piece 130. In use, it peels off against the adhesive force and brings the front end of the fastening piece 130 to the front body. The fastening base material is exposed at the tip side from the temporary fixing adhesive portion 130B, and is a tab portion.

[0360] At the opening side of the front body, a target printing sheet 74 as a design sheet is provided on the inner surface side of the knock sheet 12A, which serves as a guide for fixing the hook element 130A of the fastening piece 130. The target print with the design is made and made visible through the back sheet 12A from the outside.

[0361] When the diaper is worn, the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the leg. To do.

[0362] The space surrounded by the standing part forms a confined space for urine or soft stool. When urinating into this space, the urine is absorbed into the absorbent body 56 through the top sheet 30 and the rising part of the Noriya cuff 60A becomes the barrier for the stool solids. Is prevented. In the unlikely event that urine leaks laterally across the standing distal edge of the standing part, side leakage is prevented by a stop function by the flat contact part.

[0363] In the present embodiment, it is desirable that the NORY sheet 64 forming each standing cuff is not liquid-permeable but substantially liquid-permeable (or semi-liquid-permeable). The top sheet of the present invention ( The non-woven fabric laminate) may be made to repel liquid by silicon treatment or the like. In any case, the noir sheet 64 and the back sheet 12A are air permeable, and the barrier sheet 64 and the back sheet 12A each have a hydrostatic pressure of lOOmmH.

[0364] The other points, such as the material used in each part, are the same as in the case of the above-described pants-type disposable diaper, and therefore the description is omitted.

[0365] <Example of how to make disposable diapers>

Next, a manufacturing example of the above-described paper diaper will be described. The example shown in FIG. 37 and FIG. 38 shows an example of manufacturing equipment for the pants-type disposable diaper shown in FIG. 28, FIG. 29 and FIG.

[0366] The covering sheet 58 is supplied to the line from the upstream side, and then the holding sheet 80 is supplied.

In order to prevent the movement of the superabsorbent polymer particles supplied later, a sticky hot melt adhesive or the like can be applied to the holding sheet 80 in advance. FIG. 38 shows an adhesive applicator 104 for this purpose.

[0367] Subsequently, an assembly of filaments 52 2Z formed by opening the tow (details of the opening process will be described later) is also supplied with an upward force. Absorbent polymer particles 54 are sprayed and supplied. Thereafter, the wrapping sheet 58 is wrapped by passing the sailor 92, and the absorbent element 50 is obtained. Next, it is divided in the line direction by the cutter device 94 to form individual absorbent elements 50.

[0368] Further, since the intermediate sheet (second sheet) 40 has a structure shorter than the entire length of the absorbent element 50 in the embodiment, it is supplied intermittently from above.

[0369] Subsequently, the components of the NORY cuff 60 and the top sheet 30 force are supplied from above and the liquid-impermeable sheet 70 is supplied from below. Here, in the supply line of the NORY sheet 64 constituting the NORY cuff 60, the rubber thread 62 is stretched between the two non-woven fabrics and the second liquid impermeable sheet 72 is fixed in advance by a device (not shown). In this state, it is supplied to the main line together with the top sheet 30. The components of the noir cuff 60 supplied to the main line, the top sheet 30 and the liquid-impermeable sheet 70 are arranged in the shape shown in FIG. Folded by LA 96.

[0370] At the end of the line of the absorbent main body 20, a rectangular absorbent main body 20 having a longitudinal direction along the line is obtained by cutting with the cutter device 98.

[0371] The obtained absorbent main body 20 is turned 90 degrees by the turning device 100 so that the longitudinal direction of the absorbent main body 20 is orthogonal to the line.

[0372] On the other hand, in the line of the exterior sheet 12, the thread rubber 12C flows in advance between two non-woven sheets (not shown in FIG. 37), and the leg periphery is formed. For this purpose, it is cut into an oval shape by a cutter (not shown), and when the combination station 102 is reached, the absorbent main body 20 that has been turned around is installed between the cut-out portions, and hot melt adhesive, etc. And fixed to the outer sheet 12. Thereafter, it is folded up and down with the horizontal line in FIG. 37 as a boundary, and the joining regions 12A on both sides of the front body 12F and the back body 12B of the exterior sheet 12 are joined by heat sealing or the like. Thereafter, the product is divided in the line direction (the dividing means are not shown) to obtain individual products.

[0373] The fiber opening step can be performed, for example, by a line having the form shown in FIG. In other words, the toe 52Y is pulled out from the bail 52X and is gradually expanded through the widening device 120, and then passed to the thickening device 110 through the first yuf ° 126A, the second yuf ° 126B, and the third yuf ° 126C. Then, after the thickness is enlarged and the final aggregate of filaments 52Z is formed, the superabsorbent polymer particles 54 are sprayed and supplied by the superabsorbent polymer particle spraying means 90 on the filament aggregate 52Z. Later sent to Sarah 92. The tow is pulled out from the bale 52X by pulling in with the 1st-up 126A (corresponding to the drive-up roll).

That is, the toe 52Y pulled out from the bail 52X is changed in angle by the turn part 122, and then is rotated through a free-up roll 124 having a pair of free-up roll forces configured to be freely rotatable. 1st-p 126A is designed to be pulled in. In such a configuration, the force applied by the transfer resistance of the free-up roll 124 (determined according to the Ep pressure and the roll's own weight) also functions as a brake that suppresses the pull-in speed of the toe 52Y, and the tension after the free-up roll 124 is stable. To come. This is due to the fact that the rotation of the free-rolls 1 24 occurs only when the tow passes! /. [0375] The free-up roll 124's -up pressure and its own weight may be determined as appropriate, but in normal cases, it is preferable that the 2-up pressure is over OMPa and 5 MPa or less. It is preferable that the amount be more than Okg and less than 10kg. Within this range, tension can be easily stabilized.

[0376] As a result, the supply amount of tow 52Y to the 1st-up 126A that controls the supply amount of tow becomes stable, and the size, weight, and quality of the absorber become stable.

[0377] In addition, the tow 52Y drawn from the bale 52X is placed between the bale 52X and the free-up roll 124, between the free-up roll 124 and the first-up 126A, and between the first-up 126A and the first. The widening device 120 provided between the 2-p 126B and between the 2-p 126B and the 3-p 126C is widened stepwise to a desired width. At this time, it can also be expanded in the thickness direction.

FIG. 39 and FIG. 40 show the widening device 120, and a rectangular tube passage 120A having a predetermined width X through which the tow passes, and compressed air formed on a surface along the width direction on the inner surface of the passage 120A. The tow 52Y introduced into the passage 120A is widened to the full width of the passage by the force of compressed air. The height of the passage is equal to or greater than the thickness of the tow 52Y to be introduced, and when it is higher than the thickness of the tow 52Y, the tow 52Y is also expanded in the thickness direction.

[0379] As shown in FIG. 40, the spout 120B is line-symmetric with respect to the center in the width direction of the passage 120A, and has a dogleg shape that is located downstream in the toe passage direction toward the center in the width direction of the passage 120A. (Or V-shaped) It is a slit.

[0380] When the tow enters the passage 120A in such a state that the slit 120B force is also ejected, the tow 52Y receives the force of the compressed air in a well-balanced manner even if the approach position is shifted in the center force in the width direction. Thus, it escapes to the center in the width direction (in the direction of the arrow in FIG. 40) and the toe 52Y is naturally guided to the center in the width direction of the passage 120A. In other words, the introduction position of the toe 52Y can be centered using compressed air for widening. Further, in this embodiment, since the toe 52Y is guided in a non-contact manner, there is an advantage that damage and collapse of the tow are less likely to occur compared to the case where the toe 52Y is guided by contact. In addition, the widening device 120 having such a centering function is not only capable of centering in widening, but also has a function of correcting the transfer position. Also demonstrates.

[0381] When centering is performed using compressed air as described above, the shape of the slit is not limited to the square shape, and is symmetrical with respect to the center in the width direction of the passage 120A and toward the center in the width direction of the passage 120A. As long as the conditions located downstream in the toe passing direction are satisfied, it may be formed in a curved shape, an arc shape or the like.

[0382] On the other hand, tension is applied between the 1st-up 126A and the 2nd-up 126B so as to apply tension to the toe 52Y. The peripheral speed of each -up roll is set so as to be relaxed between As a result, tension is applied to the tow 52Y between the first-up 126A and the second-up 126B, so that the entanglement between the filaments is forcibly removed to some extent and the separation of the filaments is promoted. At the same time, the tow 52Y is widened by the widening device 120 along with the separation, so that the tow 52Y can be further uniformly widened. In addition, the toe 52Y is widened by the widening device 120 while the tow 52Y is relaxed between the 2-up 126B and the 3-up 126C. It becomes.

[0383] In a more preferred form, one roller of the second 2-p 126B is formed with a large number of continuous grooves in the circumferential direction at small intervals in the longitudinal direction. This groove has the function of promoting tow unraveling by allowing the filament to enter a large number of grooves. Further, in this case, in order to enhance the effect of the groove, the holding angle of the toe 52Y (the rotation direction angle of the toe contact portion) in one of the grooved rollers of the 2-up 126B is increased, and the toe 52Y and the grooved roller are increased. It is also a preferable form to increase the contact area. Specifically, the angle between the tow 52Y on the upstream side of the 2-p 126B and the tow 52Y on the downstream side, that is, the direction change angle by the grooved roller is less than 180 degrees, especially acute angle (smaller than 90 degrees) It is preferable to constitute so that.

[0384] In addition, the first-up 126A, the second-up 126B, and the third-up 126C may have different combinations of roll diameters. The force applied to the tow 5 2Y between the rolls and the contact resistance between the roll and the toe 52Y may cause unevenness in the toe width direction.

[0385] Next, the tow that has passed through the 3-p 126C is guided to the thickening device 110. The thickening device 110 is disclosed in, for example, Japanese Patent Laid-Open No. 59-500422 (WO 83/03267). As shown schematically in FIG. 41, a bench lily part 110b is formed between the inlet 110A and the outlet 110B, a compressed air inlet 110a is provided on the inlet side, and a bench lily is formed. A part 110b has an air exhaust hole 110c. In plan view, it is almost rectangular and flat in the direction penetrating the page of FIG.

[0386] When the compressed air is blown from the blowing port 110a, air enters from the inlet 110A due to the ejector effect, and as a result, the tow 52Y is drawn and given a forward force. When the toe 52Y reaches the bench lily part 110b, the air is exhausted from the air exhaust hole 110c, and the space of the bench lily part 110b is expanded, so the bulk of the toe 52Y mainly increases in the thickness direction. The thickness is enlarged. Note that by making the width of the passage wider than the width of the tow 52Y to be introduced, the width can be increased as shown in the lower part of FIG.

[0387] As the superabsorbent polymer particle spraying means 90, it is preferable to disperse the superabsorbent polymer particles in the entire thickness direction with respect to the filament aggregate. As such a superabsorbent polymer particle spraying means 90, it is desirable to provide not only a drop force due to the weight of the superabsorbent polymer particles themselves but also an acceleration force. An example of this is shown in FIG. In other words, a rotating drum 90b having a projection hole 90d in a casing 90a having an opening in the lower part is configured to rotate in the moving direction of the web (counterclockwise in FIG. 43), and a shirter drum 90c is placed inside the rotating drum 90b. It is provided. The projection unit 90A including these elements is connected to the hopper 90B (see FIG. 38), and the superabsorbent polymer particle spraying means 90 is configured.

[0388] The superabsorbent polymer particles 54 from the hopper 90B are configured to be supplied into the rotating drum 90b. Here, the opening position of the shatter drum 9 Oc is adjusted in advance with respect to the opening position of the casing 90a. In the state of Fig. 42, the fully opened state is shown. Further, the projection hole 90d of the rotating drum 90b is divided into four groups in the circumferential direction as shown in the drawing as a group divided in the circumferential direction. Therefore, in the process shown in the drawing, four sheets of disposable diapers are rotated. The superabsorbent polymer particles are sprayed and projected on the surface.

[0389] The superabsorbent polymer particles 54 may be continuously sprinkled onto the aggregate of filaments 52, but as shown in Fig. 37, the absorbent element 50 is divided in the line direction by the cutter device 94. However, when the individual absorbent elements 50 are used, the presence of the superabsorbent polymer particles 54 The blade of the starter device 94 is worn out in a short time. Therefore, it is desirable that the superabsorbent polymer particles 54 be intermittently dispersed and projected only in the zone Z, as shown in FIG.

[0390] For this reason, as described above, the projection hole 90d of the rotating drum 90b is formed as a group divided in the circumferential direction, and as shown in the figure, divided into four groups in the circumferential direction. The polymer particles 54 are intermittently scattered and projected only in the zone Z. As a result, the zone Z and Z can be divided by the cutter device 94, and the blade wear of the cutter device 94 can be suppressed.

[0391] In the present invention, the force with which the dispersion density of the superabsorbent polymer particles 54 is different between the main absorbent portion 56C and the both side portions 56S, 56S of the crotch portion. It can be manufactured by adjusting the spraying amount according to the part or adopting a spraying pattern that does not spray on both sides of the crotch. The amount of the superabsorbent polymer particles can be adjusted mainly by adjusting the size of the diameter of the projection hole 90d and adjusting the position of the opening of the shatter drum 90c with respect to the position of the opening of the casing 90a. It can be adjusted by the arrangement of holes 90d.

[0392] On the other hand, if necessary, superabsorbent polymer particles 54 can be dispersed and projected onto the aggregate of filaments 52 together with pressurized air, so that the superabsorbent polymer particles are substantially formed on the aggregate of filaments. It is also possible to disperse in the entire thickness direction. However, it is not recommended because the superabsorbent polymer particles sprayed on the aggregate of filaments 52 are scattered by the pressure air and scattered outside the specified area.

[0393] Further, in addition to or instead of the superabsorbent polymer particle spraying means 90, the superabsorbent polymer particles 54 sprayed on the filament aggregate are sucked from below the filament aggregate. May be.

[0394] Also, as shown in Fig. 43, the rotating roll shown in Fig. 37 is replaced with a vacuum roll 106, and the superabsorbent polymer particles are sprayed by applying the centrifugal centrifugal force as described above. Superabsorbent polymer particles 54 can also be sprayed onto the aggregate 52Z of filaments 52 by means of a superabsorbent polymer particle spraying means in which polymer particles are dropped by their own weight. In this case, suction by vacuum roll 106 Since the superabsorbent polymer particles enter the aggregate of the filaments 52 due to attractive force, the superabsorbent polymer particles are dispersed in the lower part of the absorber 56 in the product stage. In addition, in order to manufacture the absorbent body of the present invention, the amount of the superabsorbent polymer particles 54 to be applied is adjusted according to the region, or a spray pattern that does not spray on both sides of the crotch part is adopted. This is the same as the aforementioned distribution means 90.

On the other hand, FIG. 44 shows an example of a manufacturing method of the tape-type disposable diaper shown in FIG. 35 and FIG. The supply of the intermediate sheet (second sheet) 40 is the same as in the case of the pants type. After the intermediate sheet 40 is intermittently supplied, the top sheet 30 is subsequently supplied from the upper side, the liquid-impermeable sheet 70 is supplied from the lower side, and then the NORY sheet 64 constituting the NORY cuff 60 is supplied. . In the supply line of the noir sheet 64, the supply force in a state in which the rubber thread 62 is fixed under stretch between two nonwoven fabrics is previously provided by a device (not shown). At the end of the line, the semi-finished product with the absorbent main body is cut by the cutter device 98 and the product 10 is obtained.

Example

[0396] Fig. 47 shows that the absorbent article 200 according to the present invention has a high absorption capacity uniformly on both sides of the crotch portion of the absorbent body and the absorbent article 200 according to the present invention in which the basis weight of the super absorbent polymer particles is smaller than that of the primary absorbent section. In Comparative Example 201, in which functional polymer particles were sprayed, 150 g of human urine was absorbed, and the standing force of floss 60 and the roundness of the product were compared. It can be seen that the absorbent core 200 of the absorbent article 200 according to the present invention rises high and the product is rounded to fit the body.

Industrial applicability

[0397] The present invention provides a force S that can be applied to absorbent articles such as disposable diapers, sanitary napkins, incontinence pads, and diaper covers, and optimally absorbent diapers or diaper covers or paper diapers. It is a pad.

Brief Description of Drawings

FIG. 1 is a perspective view of a pants-type disposable diaper.

FIG. 2 is a developed plan view of a pants-type disposable diaper.

[Fig.3] Pants-type messenger! Forming an embossed diaper! 4 is a sectional view taken along the line 4.

[FIG. 4] A cross-sectional view of the pant-type using the diaper embossed.

FIG. 5 is a cross-sectional view of another first example of emboss formation.

FIG. 6 is a cross-sectional view of another second example of emboss formation.

FIG. 7 is a cross-sectional view of another third example of emboss formation.

FIG. 8 is a developed plan view of a tape-type disposable diaper.

FIG. 9 is a cross-sectional view taken along line 9 9 in FIG.

FIG. 10 is a perspective view of a pants-type disposable diaper.

FIG. 11 is a developed plan view of a pants-type disposable diaper.

FIG. 12 is a cross-sectional view taken along line 3-3 in FIG.

FIG. 13 is a cross-sectional view of another example.

FIG. 14 is a cross-sectional view of another example.

FIG. 15 is a cross-sectional view of another example.

FIG. 16 is a cross-sectional view of another example.

FIG. 17 is a cross-sectional view of another example.

FIG. 18 is a developed plan view of a tape-type disposable diaper.

FIG. 19 is a cross-sectional view taken along line 9 9 in FIG.

[20] It is a schematic diagram showing an example of manufacturing equipment for an absorbent element.

圆 21] It is a schematic diagram showing an example of manufacturing equipment for a pants-type disposable diaper.

圆 22] It is a schematic diagram showing an example of manufacturing equipment for a tape-type disposable paper diaper.

[FIG. 23] A schematic diagram of the opening facility.

FIG. 24 is a schematic view of a widening device.

FIG. 25 is a sectional view taken along the line XV—XV in FIG. 24.

FIG. 26 is a schematic view of a thickening device.

FIG. 27 is a schematic diagram of an example of an SAP supply device.

FIG. 28 is a perspective view of a pants-type messenger!

FIG. 29 is a developed plan view of a pants-type disposable diaper. 30 is a cross-sectional view taken along line 3—3 in FIG.

FIG. 31 is a cross-sectional view taken along line 3-3 of another example.

FIG. 32 is a cross-sectional view of another example taken along line 3—3.

FIG. 33 is a cross-sectional view corresponding to the line 3—3 of the modification.

FIG. 34 is a cross-sectional view of another example taken along line 3-3.

FIG. 35 is a developed plan view of a tape-type disposable diaper.

FIG. 36 is a cross-sectional view taken along the line 99 in FIG. 35.

[37] FIG. 37 is a schematic diagram showing an example of manufacturing equipment for a pants-type disposable diaper.

FIG. 38 is a schematic diagram of the main part.

FIG. 39 is a schematic diagram of a widening device.

FIG. 40 is a cross-sectional view taken along the line の in FIG. 39.

FIG. 41 is a schematic diagram of a fiber opening device.

圆 42] It is a schematic diagram of an example of a superabsorbent polymer particle spraying means.

[43] It is a schematic diagram of another superabsorbent polymer particle spraying form.

[44] FIG. 44 is a schematic diagram showing an example of a manufacturing facility for a tape-type disposable paper diaper.

FIG. 45 is a schematic diagram showing a planar arrangement of SAP and adhesive in the absorbent body.

FIG. 46 is a diagram showing an example of a holding sheet.

FIG. 47 is a diagram showing experimental results.

Explanation of symbols

10… Pants-type disposable diapers, 10A… Tape-type disposable diapers, 12 ··· Exterior sheet, 12Α ··· Knock sheet, 20 ················································ 50 ... Absorbing element, 52 ··· Filament, 52Χ ··· Veil, 52Υ · · · Tow, 52Ζ · · · Aggregation of filaments, 54 · · · Highly absorbent polymer particles, 56 · · · Absorber, 56Α ·························································································································································· night Impervious sheet, 72 ... Second liquid impervious sheet, 80 ... Retaining sheet, Ε ... Heat fusion part, 90 ... Super absorbent polymer particle spraying means, 90Α ... Projection part, 90a ... Case, 90b ... Rotating drum , 90c ... shirt drum, 92 ... Sarah, 94 ... cutter device, 98 ... cutter device, 1 00 ... turning device, 102 ... Combined station, 104, ... adhesive coating apparatus, 110 ... 拡厚 instrumentation 110a… Pressure air inlet 110b… Bench lily part 120 ··· Wideening device 124 ··· Fuji-up roll 126 ° ··· 1st-up 126 ° ··· 2-up 126C ... No. 3-p, 1 30 ... Fasung piece, E ... Recess, Z ... High-absorbency polymer particle spray zone.

Claims

The scope of the claims

[1] In an absorbent article having a liquid-permeable top sheet, an absorbent main body including an absorbent body formed by a filament aggregate formed by opening a tow, and a liquid-impermeable sheet in this order, In the region where the absorbent main body is located, groove-shaped embosses that reach the absorber from the top sheet are formed substantially along the longitudinal direction on both sides of the wearer's crotch. Absorbent article.

[2] The absorbent article according to claim 1, wherein the emboss is formed along a direction intersecting with an orientation direction of the filament aggregate.

[3] The embossing includes at least a first portion formed substantially longitudinally on both sides of the crotch part of the wearer and a second portion formed on the front and rear portions of the absorbent main body, The first portion and the second portion are substantially connected to form a substantially annular embossment.

The absorbent article according to claim 1 or 2.

[4] It has an absorption element that absorbs the liquid that has passed through the top sheet on the use surface side,

The absorbent element is obtained by opening the tow and has an aggregate of hardly absorbed filaments whose absorption amount is 1.0 times or less of its own weight,

In the filament assembly, the filament extends along the top sheet, and both ends of the filament are spaced inward from the periphery of the absorbent element.

An absorbent article characterized by the above.

[5] The absorbent article according to claim 4, wherein the absorbent body is one in which a filament assembly is attached to a liquid-permeable sheet or wrapped with a liquid-permeable sheet.

[6] At least on both sides of the crotch portion are formed embossed recesses extending in the front-rear direction and having a middle portion in the front-rear direction bulging toward the center in the width direction. The embossed recesses are formed on the top sheet. The absorbent article according to claim 4 or 5, wherein the absorbent article is formed so as to reach the absorber from a use surface side.

[7] It has an absorption element that absorbs liquid that has passed through the top sheet on the use surface side,

The absorbent element has a lower layer absorber and an upper layer absorber provided on the top sheet side,

The upper layer absorbent is obtained by opening the tow and absorbs less than 1.0 times its own weight. The filament assembly force is also obtained. In this filament assembly, the filament extends along the top sheet, and both ends of the filament are separated from the peripheral edge of the lower layer absorber to the inside.

An absorbent article characterized by the above.

[8] The absorbent article according to [7], wherein the upper layer absorbent body is one in which a filament aggregate is attached to a liquid permeable sheet or wrapped with a liquid permeable sheet.

[9] The absorbent article according to claim 7 or 8, wherein the lower layer absorbent is obtained by mixing pulp fibers and superabsorbent polymer particles and stacking them.

[10] The absorbent article according to claim 7 or 8, wherein the lower layer absorbent is obtained by mixing and laminating a filament aggregate and superabsorbent polymer particles.

[11] It has an absorption element that absorbs liquid that has passed through the top sheet on the use surface side,

The lower layer absorbent body is obtained by opening the tow and has an absorption capacity of a hard-to-absorb filament that is less than 1.0 times its own weight. In this filament assembly, the filament extends along the top sheet. And both ends of the filament are spaced inward from the periphery of the upper absorbent body,

An absorbent article characterized by the above.

[12] At least on both sides of the crotch portion, there are formed embossed recesses extending in the front-rear direction and having a middle portion in the front-rear direction bulging toward the center in the width direction. The absorbent article according to claim 7, wherein the absorbent article is formed so as to reach the upper layer absorbent body from the use surface side.

[13] A difficult-to-absorb filament assembly that is obtained by opening the tow and absorbs less than 1.0 times its own weight is attached to the liquid-permeable sheet or wrapped with the liquid-permeable sheet, A method for producing an absorbent body, comprising: cutting the filament assembly at predetermined intervals in a continuous direction, and attaching the cut filament aggregate to a predetermined position on the absorbent body or the absorbent sheet.

[14] It has an absorption element that receives and holds liquid that has passed through the top sheet on the use surface side,

The absorbent element comprises a collection of filaments and superabsorbent polymer particles that have been opened tow. Including an absorbent having

The absorbent body has a crotch portion, a front portion of the crotch portion, and a rear portion of the crotch portion, and has a superabsorbent polymer particle in a main absorbent portion that is a portion other than both side portions of the crotch portion. The basis weight of the superabsorbent polymer particles on both sides of the crotch part is less than that of the main absorbent part,

An absorbent article characterized by the above.

15. The absorbent article according to claim 14, wherein the superabsorbent polymer particles are bonded to the filament assembly with an adhesive.

[16] The absorption according to claim 14 or 15, wherein the absorbent element includes a wrapping sheet that wraps the absorber, and the superabsorbent polymer particles are adhered to the wrapping sheet with an adhesive. Sex goods.

[17] The absorbent article according to any one of claims 14 to 16, comprising a holding sheet for holding the superabsorbent polymer particles.

18. The absorbent article according to claim 17, wherein the superabsorbent polymer particles are adhered to the holding sheet with an adhesive.

[19] The holding sheet having holding holes for the superabsorbent polymer particles.

The absorbent article according to any one of -18.

[20] The absorbent article according to claim 19, wherein the holding sheet is provided only in a portion overlapping the main absorbent portion.

[21] The holding sheet according to any one of claims 14 to 18, further comprising a holding sheet having a holding hole for the superabsorbent polymer particles only in a portion overlapping the main absorption portion on a back surface side of the absorber. Absorbent articles.

[22] The absorbent article according to claim 15, 16 or 18, wherein an adhesive for adhering the superabsorbent polymer is disposed only on the main absorbent portion.