JP5712621B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article including an absorbent body including fluff pulp and a superabsorbent polymer, and an absorbent-encapsulated sheet that encapsulates the front surface, both side surfaces, and the back surface of the absorbent body.

  Conventionally, as an absorbent body constituting an absorbent article, an absorbent body including fluff pulp and a super absorbent polymer (hereinafter sometimes referred to as “SAP”) has been used.

  Fluff pulp is excellent in immediate absorbency (absorption rate) although its absorption per unit volume is small. On the other hand, SAP is inferior to fluff pulp in terms of absorption speed, but has a large absorption amount per unit volume, and can absorb about 50 times the volume of water. Therefore, the absorbent body combining fluff pulp and SAP can be gradually transferred to SAP after the wearer absorbs and traps the excrement in the fluff pulp even if the wearer excretes a large amount of excrement at a time. It is. That is, the absorber has a feature that it is excellent in both absorption speed and absorption amount.

  In the absorbent body, granular and powdery SAP is prevented from leaking outside the absorbent article, and the absorbent body is encapsulated with tissue or the like for the purpose of preventing the absorbent body from being deformed. ing. For example, as shown in FIGS. 2A and 2B, there is known an absorbent article in which the front surface S1, the side surfaces S3, S4, and the back surface S2 of the absorbent body 122 are encapsulated by tissue 150 (upper tissue 152 and lower tissue 154). (See Patent Document 1 or 2).

  In the absorbent article as described above, in order to prevent the absorber from being deformed as described above, the tissue 150 is placed against the surface S1, the side surfaces S3, S4 and the back surface S2 of the absorber 122 as shown in FIG. 2B. A configuration in which the absorbent body 122 is tightly wrapped and tightly wrapped with the tissue 150 is common.

  By the way, in recent years, in addition to basic functions such as excellent excretion absorbability and no leakage, absorbent articles have been required to improve the feeling of wear and appearance when worn. Therefore, it has been proposed to reduce the thickness of the relatively bulky absorber among the constituent members of the absorbent article (see Patent Document 3). By reducing the thickness of the absorbent body, the absorbent article can be easily fitted to the wearer's body, and the absorbent article fits in the wearer's clothes. Therefore, a feeling of wearing improves. Moreover, when the absorbent article fits in the wearer's clothes, the absorbent article becomes inconspicuous when viewed from outside the clothes. Therefore, the appearance when worn is also improved.

JP-A-11-33056 JP 2003-284743 A JP 2004-24569 A

  However, if the absorber is made thin, the amount of the absorbent material is reduced, and the absorption amount of the absorber may be insufficient. As a method of maintaining the absorption amount even in a thin absorbent body, a method of increasing the SAP ratio in the absorbent body and reducing the fluff pulp ratio is conceivable. According to this method, since the bulky fluff pulp can be reduced, the absorber can be thinned. Moreover, the absorption amount of the whole absorber can also be maintained by increasing the ratio of SAP with a large absorption amount. Therefore, the absorber can be thinned while maintaining the absorption amount of the entire absorber.

  However, when SAP absorbs excreta, its volume swells up to about 50 times. Therefore, when the form which tightly wraps the absorbent body with tissue or the like as in the absorbent article described in Patent Document 3, there are problems as listed below.

  First, 1) Since the absorbent body is firmly encapsulated by tissue or the like, there is a problem that SAP swelling is hindered and it is difficult to sufficiently exhibit the SAP absorption performance. On the contrary, 2) the tissue encapsulating the absorbent body may be broken or the joint part joining the tissue may be peeled off due to the expansion of the absorbent body accompanying the swelling of SAP. In the case of 2), the absorbent body is not completely encapsulated by the tissue or the like, and there is a problem that granular and powdery SAP may leak to the outside of the absorbent article. The problems 1) and 2) are expected to become more apparent as the absorber becomes thinner and the amount and ratio of SAP increase.

  The present invention has been made to solve such problems of the prior art, and can prevent SAP from leaking to the outside of the absorbent article and can prevent the absorber from being deformed. It is an object of the present invention to provide an absorbent article capable of exhibiting sufficient absorption performance without hindering the swelling of SAP and the accompanying expansion of the absorbent body.

  As a result of intensive studies to solve the problems of the prior art as described above, the present inventors have encapsulated both side edges of the absorber in the sheet material (absorber encapsulated sheet) encapsulating the absorber. A portion to be extended in the width direction of the absorbent body is formed into a bag shape, and an internal space in which the absorbent body can expand is formed as the SAP swells. 2) The bag-shaped portions are both side edges of the absorbent body. It is conceived that the above-mentioned problem can be solved by temporarily fixing the weakly bonded portion along the portion corresponding to detachable temporarily, and fixing the absorbent body so as to wrap it in a state before coming into contact with excrement. The present invention has been completed. Specifically, the following absorbent articles are provided by the present invention.

[1] An absorber including fluff pulp and a superabsorbent polymer, and an absorber encapsulating sheet that encapsulates the front surface, both side surfaces, and the back surface of the absorber, and the absorber encapsulating sheet includes: The bag portion is further extended from both side edges to form a bag portion, and both side surfaces of the absorber are encapsulated by the bag portion, and the side edge of the bag portion and the side closer to the side edge are encapsulated. Between the side edges of the absorber, the absorber encapsulating sheets constituting the bag portion are joined to each other by heat fusion or ultrasonic fusion , and a peelable weak junction is formed, The weakly joined portion is formed at a position corresponding to at least the longitudinal central portion of the absorber along both side edges of the absorber, and in a band-like region along both side edges of the absorber. An absorptive article in which a plurality of dot-like weak joints are formed .

[2] The weakly bonded portion according to [1], in which the absorbent encapsulated sheets are bonded to each other within a range of 180 ° peel strength of 0.3 to 3.0 N. Absorbent articles.

[ 3 ] The above [1] or [2 ], wherein an interval between the weakly joined portion and a side edge of the bag portion formed by the absorbent-encapsulated sheet adjacent to the weakly joined portion is within a range of 5 to 20 mm. ] The absorbent article as described in.

[ 4 ] The absorbent article according to any one of [1] to [ 3 ], wherein the weakly bonded portion is formed at a position corresponding to the entire longitudinal direction of the absorbent body.

[5] the weak joint, the formed such that there is no gap between the side edges of the absorbent body closer to the side edge of the bag portion and the weak junction [1] - [4 ] The absorbent article as described in any one of.

  The absorbent article of the present invention can prevent SAP from leaking to the outside of the absorbent article, can prevent the absorber from being deformed, and hinders the swelling of SAP and the accompanying expansion of the absorbent. Therefore, sufficient absorption performance can be exhibited.

It is a schematic plan view schematically showing one embodiment of the intake Osamusei article, the absorbent article to expand, and shows a state seen from the topsheet direction. FIG. 1B is a schematic end view schematically showing an A-A ′ cut end surface of the absorbent article shown in FIG. 1A. FIG. 1B is a schematic plan view schematically showing a state in which the absorbent article shown in FIG. 1A is developed and viewed from the cover sheet direction. It is a schematic plan view which shows typically embodiment of the absorber in the absorbent article shown to FIG. 1A, and an absorber encapsulating sheet. It is a schematic end view which shows typically the B-B 'cut end surface of the absorber and absorber covering sheet shown to FIG. 1D. It is a schematic end view which shows typically the B-B 'cut end surface of the absorber shown in FIG. 1D in the state which absorbed excretion, and an absorber encapsulating sheet. It is a schematic plan view which shows typically embodiment of the absorber in the conventional absorbent article, and an absorber encapsulating sheet. FIG. 2B is a schematic end view schematically showing a C-C ′ cut end surface of the absorbent article shown in FIG. 2A. Absorber in the intake Osamusei article and an alternative embodiment of the absorbent encapsulation sheet is a schematic plan view schematically showing. FIG. 3B is a schematic end view schematically showing a D-D ′ cut end surface of the absorber and the absorber encapsulating sheet shown in FIG. 3A. It is a schematic plan view which shows typically another embodiment of the absorber in the absorbent article of this invention, and an absorber encapsulating sheet. Absorber in the intake Osamusei article and yet another embodiment of the absorbent encapsulation sheet is a schematic plan view schematically showing. Absorber in the intake Osamusei article and an alternative embodiment of the absorbent encapsulation sheet is a schematic plan view schematically showing. Yet another embodiment of the absorbent and the absorber encapsulation sheet in intake Osamusei article is a schematic plan view schematically showing. It is a schematic plan view which shows typically further another embodiment of the absorber in the absorbent article of this invention, and an absorber encapsulating sheet. Absorber in the intake Osamusei article and an alternative embodiment of the absorbent encapsulation sheet is a schematic plan view schematically showing. Yet another embodiment of the absorbent and the absorber encapsulation sheet in intake Osamusei article is a schematic plan view schematically showing. Absorber in the intake Osamusei article and yet another embodiment of the absorbent encapsulation sheet is a schematic plan view schematically showing.

  Hereinafter, the form for implementing the absorbent article of this invention is concretely demonstrated by the example of a tape-type disposable diaper. However, the present invention broadly encompasses absorbent articles (for example, pants-type disposable diapers, urine-absorbing pads, etc.) having the invention-specific matters, and are not limited to the following embodiments.

[1] Basic configuration of the absorbent article of the present invention:
The present invention relates to an absorbent article including an absorbent body 22A such as the absorbent article 1A shown in FIGS. 1A to 1C and an absorbent encapsulating sheet 50A that encapsulates the absorbent body 22A. As shown in FIGS. 1D and 1E, the absorbent article of the present invention encloses an absorbent body 22A containing fluff pulp and a highly water-absorbing polymer, and the surface S1, both side surfaces S3, S4 and the back surface S2 of the absorbent body 22A. The absorber encapsulating sheet 50A is provided.

[1-1] Absorber:
The “absorber” is a member that absorbs and holds a wearer's excrement (such as urine), and is constituted by an absorbent material. In the case of a normal absorbent article, the type of absorbent material is not limited as long as it has the property of absorbing excrement such as urine. However, the absorber used for the absorbent article of the present invention needs to contain both fluff pulp and a superabsorbent polymer. This is because the absorbent article is excellent in both absorption speed and absorption amount.

  “Fluff pulp” is pulp defibrated into cotton. The pulp to be defibrated may be wood pulp or non-wood pulp. As a wood pulp, the pulp derived from a conifer is preferable. However, pulp derived from hardwood, straw, bamboo, kenaf or the like can also be used.

  “Superabsorbent polymer” is a hydrophilic polymer having a cross-linked structure, and has a water absorption of 10 times or more of its own weight, and is difficult to separate even under pressure (Super Absorbent Polymer: hereinafter referred to as “SAP”). ).

  Examples of the SAP include conventionally known SAPs, such as A) starch-based (starch-acrylic acid (salt) graft copolymer, saponified starch-ethyl acrylate graft copolymer, etc.); B) cellulose-based (sodium carboxy Cross-linked products of methyl cellulose, etc.); C) Synthetic resin systems (acrylic acid (salt) polymers, cross-linked products of polyvinyl alcohol-maleic anhydride reactant, etc.) can be used. These can be used alone or in admixture of two or more. Among the SAPs, it is preferable to use sodium polyacrylate having high water absorption performance.

There is no particular limitation on the amount of fluff pulp. However, it is preferable to set it as 50-250 g / m < ² >. By setting it as 50 g / m < ² > or more, the absorbent article excellent in immediate absorbency (absorption rate) can be comprised. On the other hand, an absorber can be reduced in thickness by setting it as 250 g / m < ² > or less. In order to obtain these effects more reliably, the amount of fluff pulp is more preferably 50 to 150 g / m ² .

  The amount of SAP is not particularly limited. However, it is preferable to set it as 80-500 mass parts (fluff pulp: SAP = 1: 0.8-5) with respect to 100 mass parts of fluff pulp. By setting it as 80 mass parts or more, even if it reduces the amount of fluff pulp, the absorption amount of the whole absorber is hard to fall. On the other hand, by setting it as 500 mass parts or less, the absorption rate of an absorber is hard to fall extremely. When it is desired to obtain these effects more reliably, it is more preferable to use 120 to 500 parts by mass (fluff pulp: SAP = 1: 1.2 to 5).

  In addition, as long as the absorber used in this invention contains fluff pulp and SAP, it may further contain other absorbent materials. As other absorbent materials, hydrophilic sheets such as tissue, absorbent paper, and non-woven fabric subjected to hydrophilic treatment can be used.

  The arrangement form of SAP and fluff pulp in the absorbent body is as follows: A) SAP is dispersed inside the fluff pulp mat, and B) SAP is arranged in layers between the mats in a laminate in which a plurality of fluff pulp mats are laminated. It is possible to adopt a form such as.

  The thickness of the absorber is not particularly limited. However, it is preferably 1 to 6 mm. By setting the thickness to 1 mm or more, the absorbent body can exhibit sufficient absorption performance. On the other hand, an absorber can be made thin by setting it as 6 mm or less. In order to obtain these effects more reliably, the thickness of the absorber is more preferably 1 to 3 mm.

  The planar shape of the absorber is not particularly limited. The same shape as a conventionally well-known absorbent article can be employ | adopted. Examples thereof include a rectangular absorbent body 22A as shown in FIG. 1D and an hourglass-shaped absorbent body 22F as shown in FIG. The “hourglass type” means a planar shape when the hourglass is viewed from the front side. That is, when the absorber is viewed in plan, it indicates a shape in which both end portions in the longitudinal direction are wide and the central portion in the longitudinal direction is constricted and narrowed.

[1-2] Absorber-encapsulated sheet:
The “absorber-encapsulated sheet” prevents SAP contained in the absorber from falling off, prevents SAP from leaking outside the absorbent article, and prevents the absorber from being deformed. Sheet material.

  The material of the sheet material is not particularly limited. However, excretion such as urine needs to be able to be absorbed by the absorber. Usually, the same material as the hydrophilic sheet exemplified in the section of the absorbent body and the liquid-permeable sheet described later in the section of the top sheet is used.

  As shown in FIG. 1B, the absorber-encapsulating sheet 50A encapsulates the front surface S1, the side surfaces S3, S4, and the back surface S2 of the absorber 22A. "Surface" refers to the surface of the outer surface of the absorbent body that faces the wearer's crotch when the absorbent article is used. Usually, it is the surface facing the top sheet. “Back surface” refers to the surface of the outer surface of the absorbent body that faces away from the wearer's crotch when the absorbent article is used. Usually, it is the surface facing the back sheet. “Both side surfaces” refers to the surfaces of the outer surface of the absorbent body that face the outer side (right side and left side) in the width direction of the absorbent article.

  The absorber encapsulating sheet only needs to encapsulate at least the front surface, both side surfaces, and the back surface of the absorber. However, as shown in FIGS. 1D and 1E, in addition to the front surface S1, the two side surfaces S3, S4, and the back surface S2 of the absorber 22A, both end surfaces S5, S6 of the absorber 22A may be encapsulated. The “both end surfaces” refer to surfaces of the outer surface of the absorbent body that face the front side or the rear side in the front-rear direction (direction perpendicular to the width direction) of the absorbent article when the absorbent article is mounted.

  In the example shown in FIG. 1D and FIG. 1E, the both ends of the laminated | stacked absorber covering sheet 50A are joined by the junction part 62, and are sealed. Thereby, it encapsulates so that both end surfaces S5 and S6 of absorber 22A may not be exposed.

  The form of the absorber encapsulation is not particularly limited. For example, as shown in FIG. 1D and FIG. 1E, the absorber encapsulating sheet 50A is composed of two sheets, an upper sheet 52A and a lower sheet 54A, and the upper sheet 52A and the lower sheet 54A are joined on the surface S1 of the absorber 22A. Can be mentioned. Moreover, you may comprise so that the absorber 22B may be wrapped with one absorber covering sheet 50B, as shown to FIG. 3A and 3B.

[2] Characteristic configuration of the absorbent article of the present invention:
In the case of a normal absorbent article, as shown in FIG. 2B, the absorbent-encapsulated sheet (tissue 150) is disposed in close contact with the front surface S1, both side surfaces S3, S4, and the rear surface S2 of the absorbent body 122, and the tissue 150 In general, the absorber 122 is tightly wrapped. However, when this form is applied to an absorber having a high SAP ratio such as a thin absorber, the swelling of the SAP may be hindered or the absorbent encapsulated sheet may be broken due to the swelling of the absorbent accompanying the swelling of the SAP. There is.

  Therefore, in the absorbent article of the present invention, as shown in FIG. 1D and FIG. 1E, the absorbent body-wrapping sheet 50A is extended further outward in the width direction from both side edges E1, E2 of the absorbent body 22A to form the bag portion 60A. It was decided to form.

  If it is set as the above structures, as shown to FIG. 1F, the absorber 22A expanded with swelling of SAP swollen in the internal space of the bag part 60A can be received. Accordingly, 1) swelling of the SAP is hindered, and the SAP absorption performance cannot be fully exhibited. 2) The absorbent encapsulating sheet is broken by the swelling of the absorbent accompanying the swelling of the SAP. Problems such as SAP leaking outside the absorbent article can be effectively prevented.

  The said bag part is opened only in the absorber side edge direction, and the other direction is sealed. Accordingly, both side surfaces of the absorbent body are encapsulated by the bag portion. However, only by forming the bag portion, both side surfaces of the absorbent body are not securely wrapped by the absorbent encapsulating sheet, and it is impossible to prevent the absorbent body from being deformed.

  Therefore, in the present invention, as shown in FIGS. 1D and 1E, the gap between the side edge E3 (E4) of the bag portion 60A and the side edge E1 (E2) of the absorbent body 22A closer to the side edge E3 (E4). In addition, it was decided to form a peelable weakly joined portion 56A that joins the absorbent-encapsulated sheets 50A constituting the bag portion 60A to each other.

  In the present specification, the form of forming the weak joint as described above may be referred to as “first embodiment”. On the other hand, a form in which intermittent joints are formed instead of weak joints as described later may be referred to as “second embodiment”.

  As shown in FIG. 1B, in a state before the SAP gets wet and swells, the absorbent-encapsulating sheet 50A is pressed so as to be in close contact with both side surfaces S3 and S4 of the absorbent body 22A by the weakly joined portion 56A. . Accordingly, there is an effect of preventing the absorber 22A from being deformed. On the other hand, when the SAP wets and swells due to excrement such as urine and the absorbent body expands along with this, the weakly bonded portion is expanded and peeled off by the expanded absorbent body 22A as shown in FIG. 1F. Therefore, the expanded absorbent body 22A is received in the internal space of the bag portion 60A, and the swelling of the SAP and the accompanying expansion of the absorbent body 22A are not hindered.

  The “bag portion” refers to a bag-like portion in which an internal space and an opening communicating with the inner space are formed. In the absorbent article of the present invention, as shown in FIG. 1D and FIG. 1E, the absorbent body includes a portion that extends further outward in the width direction from both side edges E1, E2 of the absorbent body 22A of the absorbent body-wrapping sheet 50A. A bag portion 60A having the opening in the direction of the side edges E1 and E2 of 22A is formed. More specifically, at least two layers of the absorber encapsulating sheet are laminated, and the peripheral portion of the two-layer absorber encapsulating sheet is sealed except in one direction (that is, the direction of the opening), whereby the bag portion is formed. It is formed. As shown in FIG. 1D and FIG. 1E, a pair of right and left bag portions 60A are formed around the absorbent body 22A. And each bag part 60A is formed so that the internal space may be opened toward the side edges E1 and E2 of the absorber 22A.

  “Weak bonding” means bonding with such a strength that it is peeled only when a force is applied by the expanded absorbent body. The peeling force is not particularly limited. However, it is preferable that the weakly bonded portion is formed by bonding the absorbent encapsulated sheets to each other within a range of 180 ° peel strength of 0.3 to 3.0 N / 25 mm. By setting the peeling force to 0.3 N / 25 mm or more, it is possible to obtain an effect of preventing the absorber from being deformed in a state before the SAP is wetted and swollen. On the other hand, by setting the peeling force to 3.0 N / 25 mm or less, it is possible to obtain an effect that the weakly bonded portion is peeled when the absorbent body expands with the swelling of the SAP.

  The “peeling force” mentioned here means a value measured according to the method described in JIS Z0237. Specifically, it is the peel force measured under the conditions of 25 mm width, tensile speed 200 mm / min, and 180 ° peel.

  The method of weak joining is not particularly limited. Conventionally known joining methods such as heat fusion (heat sealing), ultrasonic fusion, and adhesion using an adhesive can be employed. In the case of heat fusion, the peeling force can be adjusted by the fusion temperature, the pressing force applied to the convex mold, the clearance between the convex mold and the concave mold, and the like. In the case of ultrasonic fusion, the frequency can be adjusted as appropriate depending on the frequency, amplification factor, clearance between the horn and the anvil, etc., and in the case of adhesion with an adhesive, depending on the type, coating amount, coating method, etc. .

  The adhesive can be applied by a contact method using a slit coater (shim coater), a non-contact method such as curtain spray, spiral spray, omega coat, or summit. The omega coat can be performed by using, for example, an omega nozzle head (manufactured by ITW Dynatech), and the summit can be performed by using, for example, a summit nozzle (manufactured by Nordson).

  The kind of adhesive agent is not specifically limited, What is necessary is just to use the adhesive agent conventionally used for manufacture of an absorbent article. For example, an adhesive having high fluidity such as a hot melt adhesive can be preferably used.

  As shown in FIG. 1D, the weakly joined portion 56A needs to be formed along both side edges E1, E2 of the absorber 22A. This is because both side surfaces S3 and S4 of the absorber 22A are pressed by the absorber encapsulating sheet 50A to prevent the absorber 22A from being deformed.

  “Along both side edges of the absorber” means “so as to be parallel to both side edges of the absorber”. Specifically, as shown in FIG. 1D and FIG. 1E, in the region between the side edge E1 (E2) and the side edge E3 (E4) of the absorber 22A, it is parallel to the side edges E1 and E2 of the absorber 22A. A weakly joined portion 56A is formed.

  In the absorbent article of this invention, it is preferable that the space | interval of the said weak junction part and the side edge of the said absorber encapsulating sheet adjacent to the said weak junction part exists in the range of 5-20 mm. By setting the distance to 5 mm or more, it is possible to obtain an effect that it is difficult to inhibit the swelling of the SAP and the accompanying expansion of the absorbent body. On the other hand, by setting the distance to 20 mm or less, it is possible to obtain an effect of preventing the absorber from being deformed. In order to obtain the above effect more reliably, the distance is more preferably 5 to 15 mm, and the weak joint portion is adjacent to the side edge of the absorber closer to the side edge of the bag portion. It is particularly preferable that the film is formed as described above. “To be adjacent” means that there is no gap between the side edge of the absorber and the weak joint. The points where these configurations are preferable are the same for the intermittent joint portion of the second embodiment described later.

  Further, as shown in FIG. 7, it is sufficient that the weakly joined portion 56F is formed at a position corresponding to at least the center portion in the longitudinal direction of the absorber 22F. This is because the excrement collects in the vicinity of the crotch of the absorbent article, and therefore, the SAP swells in this portion and the absorption body expands accordingly. However, as shown in FIG. 1D, it is preferable to form the weakly joined portion 56A at a position corresponding to the entire longitudinal direction of the absorber 22A. The form as shown in FIG. 1D has an advantage that the effect of preventing the absorber 22A from being deformed is high.

  The “position corresponding to the central portion in the longitudinal direction of the absorber” corresponds to the central portion (portion other than both end portions) when the absorbent body in plan view is divided into three equal parts based on the total length in the longitudinal direction. Means position.

  The joint pattern of the weak joint is not particularly limited. Hereinafter, some examples of the bonding pattern will be shown.

  The weakly joined portion 56A shown in FIGS. 1D and 1E and the weakly joined portion 56B shown in FIGS. 3A and 3B have a form in which a band-like weakly joined portion is formed. In these forms, weak joints 56A and 56B are continuously formed at positions corresponding to the entire longitudinal direction of the absorbers 22A and 22B. These forms have an advantage that the shape of the absorber is prevented and the effect of stabilizing the absorbent shape is high. In addition, it is preferable that the shape of the absorber is stabilized because SAP can be prevented from falling from the absorber due to deformation of the absorber.

  The weakly joined portion 56C shown in FIG. 4 has a form in which dot-like weakly joined portions 56C are formed in a staggered manner in the beltlike region instead of the beltlike weakly joined portion 56A shown in FIG. 1D. Also in this embodiment, the weakly joined portion 56C is formed at a position corresponding to the entire longitudinal direction of the absorber 22C. Although such a form is inferior to the form shown to FIG. 1D and FIG. 3A, there exists an effect which prevents the shape loss of the absorber 22C and stabilizes the shape of the absorber 22C.

  Moreover, when it forms intermittently toward the front-back direction of absorber 22C like 56 C of weak junctions, it will be weakly joined when an absorber expand | swells compared with the weak junction part formed continuously. The part can be easily peeled off. Therefore, the swelling of the SAP is not hindered, and it is difficult for problems such as breakage of the absorbent-encapsulated sheet due to the expansion of the absorbent accompanying the swelling of the SAP. The same effect can be obtained by forming a linear joint intermittently instead of the dot-like weak joint 56C as shown in FIG.

  As the shape of the dot-like weakly joined portion, a shape such as a rectangle, a polygon, a circle, an ellipse, a curve, or a geometric pattern can be used alone or in combination as appropriate. The dot-shaped weak joints may be arranged in a matrix as well as in a staggered manner as shown in FIG.

As a reference example, the weakly joined portion 56D shown in FIG. 5 has a form in which a plurality of linear weakly joined portions 56D are formed in the belt-like region instead of the beltlike weakly joined portion 56A shown in FIG. 1D. Also in this embodiment, the weakly joined portion 56D is formed at a position corresponding to the entire longitudinal direction of the absorber 22D. Although such a form is inferior to the form shown in FIG. 1D and FIG. 3A, it has the effect of preventing the shape of the absorber 22D from being lost to the same extent as the form shown in FIG. 4 and stabilizing the shape of the absorber 22D.

As a reference example, the weakly joined portion 56E shown in FIG. 6 has a form in which one linear weakly joined portion 56E is formed on each of the left and right instead of the plurality of linearly weakly joined portions 56D shown in FIG. Also in this embodiment, the weakly joined portion 56D is formed at a position corresponding to the entire longitudinal direction of the absorber 22D. In such a form, the weak joint 56E is formed so as to be adjacent to both side edges E1 and E2 of the absorber 22E, thereby preventing the absorber 22E from being deformed to the same extent as the form shown in FIG. The effect of stabilizing the shape of 22E can be obtained. That is, even if the formation area of the weak joint portion is smaller than that of the weak joint portion 56D shown in FIG.

As a reference example, the weak joint portion may be formed only at a position corresponding to the central portion in the longitudinal direction of the absorber. In particular, with respect to the hourglass-shaped absorber 22F as shown in FIG. 7, a wide weakly joined portion 56F can be formed at the central portion in the longitudinal direction where excreta easily collects. The wide weak joint portion 56F can increase the volume of the internal space that receives the absorber when the absorber 22F expands.

  The weakly joined portion 56F shown in FIG. 7 is an example in which the same form as the weakly joined portion 56A shown in FIG. 1D is applied to a position corresponding to the center in the longitudinal direction of the hourglass-shaped absorber 22F. Further, the weakly joined portion 56G shown in FIG. 8 is an example in which the same form as the weakly joined portion 56C shown in FIG. 4 is applied to the position corresponding to the central portion in the longitudinal direction of the hourglass-shaped absorber 22G.

  Further, the weakly joined portion 56H shown in FIG. 9 is an example in which the same form as the weakly joined portion 56A shown in FIG. 5 is applied to a position corresponding to the central portion in the longitudinal direction of the hourglass-shaped absorber 22H. Furthermore, the weakly joined portion 56I shown in FIG. 10 is an example in which the same form as the weakly joined portion 56E shown in FIG. 6 is applied to a position corresponding to the central portion in the longitudinal direction of the hourglass-shaped absorber 22I.

Suction absorbent body in place to form a peelable weak junction encapsulation sheet, the usual junction 66 may be intermittently formed in the absorber encapsulation sheet 50J as shown in FIG. 11. In this embodiment, the joint portion 66 is not peeled off, but the absorbent body that has expanded from between the joint portions 66 formed intermittently enters the bag portion 60J. Therefore, it is difficult to inhibit the swelling of the SAP and the accompanying expansion of the absorbent body as in the case where the weakly bonded portion that can be peeled is formed on the absorbent encapsulated sheet.

  As for the said junction part, as shown in FIG. 11, it is preferable that the some linear junction part 66 is intermittently formed along the both-sides edges E1 and E2 of absorber 22J. Even if this form is used for active wearers (for example, infants and the like), the joint will not be unintentionally peeled off before the absorbent expands due to SAP wetting and swelling due to excrement. Absent. Therefore, it is excellent in the effect of preventing the absorber from losing its shape before SAP swelling.

  In the intermittently formed joint portion, the length of the linear joint portion 66 is preferably 1 to 10 mm. A sufficient bonding strength can be obtained by setting the length to 1 mm or more. On the other hand, when the length is 10 mm or less, it is difficult to inhibit the swelling of the SAP and the accompanying expansion of the absorbent body.

  Moreover, it is preferable that the length of the non-joining part formed between the linear joining parts 66 is in the range of 1 to 20 mm. By setting the length to 1 mm or more, it is difficult to inhibit the swelling of the SAP and the accompanying expansion of the absorbent body. On the other hand, by setting the length to 20 mm or less, sufficient bonding strength can be obtained.

  The intermittently formed joint portion preferably has a linear joint portion 66 to non-joint length ratio in the range of 1: 1 to 1:10. By setting the length ratio to 1: 1 or more, it is difficult to inhibit the swelling of the SAP and the accompanying expansion of the absorbent body. On the other hand, when the length ratio is 1:10 or less, a sufficient bonding strength can be obtained.

[3] Other:
What is necessary is just to comprise about the other part of the absorbent article of this invention similarly to a conventionally well-known absorbent article. Hereinafter, the absorbent article 1A (tape-type disposable diaper) illustrated in FIGS. 1A to 1C will be described as an example.

  In the absorbent article 1A shown in FIG. 1A to FIG. 1C, the absorbent body 22A is covered with the top sheet 18 on the front surface side and with the back sheet 20 on the back surface side. That is, the absorber 22A is disposed between the top sheet 18 and the back sheet 20.

[3-1] Top sheet:
A top sheet is a sheet-like member arrange | positioned so that the surface (surface of the side which opposes a wearer's skin at the time of mounting | wearing of an absorbent article) of an absorber may be coat | covered. Since it is necessary to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the wearer's urine is made of a liquid-permeable material.

  Examples of the liquid permeable material include woven fabric, nonwoven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As said nonwoven fabric, the nonwoven fabric manufactured by manufacturing methods, such as air through (card hot air) and card | curd embossing, can be used conveniently. The hydrophilic treatment can be performed by applying, spraying, impregnating, etc., a surfactant to the raw cotton of the nonwoven fabric.

  The top sheet is “at least partially” made of a liquid-permeable material. Although the position is not particularly limited, it is preferable that the portion overlapping the arrangement position of the absorber in the crotch portion is made of a liquid-permeable material when viewed in plan.

  In the absorbent article of the present invention, it is not necessary that the entire surface on the side facing the wearer's skin is covered with the top sheet. For example, in a tape-type disposable diaper, a top sheet made of a liquid-permeable material is disposed at the center in the width direction of the absorbent article, and a breathable water-repellent material is provided on the side edge (side flap portion) in the width direction of the absorbent article. The form which arrange | positions the side sheet | seat which consists of is often used. At this time, it is preferable to use a nonwoven fabric sheet obtained by a method such as card embossing or spunbond, particularly a highly waterproof nonwoven fabric sheet such as SMS or SMMS, as the air-permeable and water-repellent material.

[3-2] Backsheet:
The back sheet is a sheet-like member arranged to cover the back surface of the absorbent body (the surface on the side facing away from the wearer's skin when the absorbent article is mounted). The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the absorbent article.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorbent body, it is preferable that the back sheet is disposed so as to cover at least the position where the absorbent body is disposed.

  Examples of the liquid impermeable material include a liquid impermeable film made of a resin such as polyethylene. Among these, it is preferable to use a microporous polyethylene film. This microporous polyethylene film is a film in which a large number of fine pores of 0.1 to several μm are formed, and is liquid-impermeable but has moisture permeability. Therefore, it is possible to prevent stuffiness inside the absorbent article while ensuring leakage resistance.

  In a tape-type disposable diaper, a form in which a cover sheet 24 is bonded to the outer surface side of the back sheet 20 as shown in FIG. 1C is often used. This cover sheet is used to reinforce the back sheet and improve the feel (tactile feeling) of the back sheet.

  Examples of the material constituting the cover sheet include woven fabric and non-woven fabric. Especially, it is preferable to use the dry nonwoven fabric and wet nonwoven fabric which consist of thermoplastic resins, such as polyethylene, a polypropylene, and polyester.

[3-3] Various elastic materials:
In the absorbent article of the present invention, it is preferable to arrange an elastic material such as a leg elastic material in addition to the waist elastic material.

  A leg elastic material is an elastic material for forming a leg gather. In the case of a tape-type disposable diaper, a form in which a plurality of left and right pairs of linear elastic materials are arranged in a straight line parallel to at least the crotch part 4 as in the leg elastic material 40 shown in FIGS. 1A to 1C is often used.

  As elastic materials, flat rubber made of natural rubber and thread rubber made of elastic yarn of synthetic rubber (urethane rubber, etc.), elastic net, elastic film, elastic foam (urethane foam, etc.), etc. are preferably used. be able to.

  The stretchable material is fixed in the stretched state in order to exert a sufficient stretch force without exerting an excessive tightening force on the wearer. The stretchable material can be fixed by, for example, adhesion using a hot melt adhesive, other highly fluid adhesive, heat sealing, heat sealing, or ultrasonic welding.

  “Fixed in the stretched state” means that the stretchable material is bonded, fixed, or the like to the sheet material to be fixed in a state where the stretchable material is stretched to 120% or more. Among them, the elongation rate is preferably 200 to 400%, and more preferably 250 to 350%. Note that the “stretch rate” indicates a percentage of the length of the stretchable material in the stretched state with respect to the length (original size) of the stretchable material in the non-stretched state.

  In the case of a tape-type disposable diaper, as shown in FIGS. 1A to 1C, a stretched linear elastic material is sandwiched between the top sheet 18 (or side sheet 19) and the back sheet 20 (or cover sheet 24). The leg elastic member 40 can be disposed by a method such as fixing.

  Further, as shown in FIGS. 1A to 1C, an extended planar elastic material (such as an elastic foam) is sandwiched between the top sheet 18 (or side sheet 19) and the back sheet 20 (or cover sheet 24). The waist stretchable material 42 can be disposed by a method such as fixing to the waist.

[3-4] Solid gathering:
A three-dimensional gather can be comprised according to the conventional absorbent article. As shown to FIG. 1A-FIG. 1C, it is preferable to provide the left-right paired three-dimensional gather 26 (26a, 26b) arrange | positioned at the both sides of absorber 22A.

  In the case of a tape-type disposable diaper, as shown in FIGS. 1A to 1C, a form in which the three-dimensional gather 26 is configured by a part of the side sheet 19 including the water-repellent sheet 32 is often used.

  In this case, the stretched three-dimensional gather stretchable material 36 may be sandwiched and fixed between the layers of the water-repellent sheet 32. As the water-repellent sheet, it is preferable to use a non-woven sheet obtained by a method such as card embossing or spunbond, particularly a non-woven sheet such as SMS or SMMS having high waterproofness.

  Examples of the three-dimensional gathers include inward gathers, outward fall gathers, C-fold gathers and Z-fold gathers in which bent portions and folded portions are formed in a part of the height direction. Among these, inward gathers such as the three-dimensional gathers 26A and 26B shown in FIGS. 5B and 5D are preferable in terms of high leakage prevention.

[3-5] Fastening tape:
In the case of a tape-type disposable diaper, in order to fix the front body 2 and the back body 6 arranged so as to extend from the left and right side edges 6a and 6b of the back body 6 as shown in FIGS. 1A to 1C. Those provided with the fastening tape 11 are preferably used.

  The fastening member of the fastening tape is not particularly limited. However, it is preferable to use a mechanical fastener (planar fastener) that has a high fastening force and does not easily reduce the fastening force even after a plurality of detachments. The absorbent article 1A shown in FIGS. 1A to 1C has a hook material 47 of a mechanical fastener attached as a fastening member 46 in the vicinity of the tip of the fastening tape 11. On the other hand, the front body 2 is provided with a front patch 13 made of a loop material 48 of a mechanical fastener.

  The number of fastening tapes is not particularly limited, and an appropriate number of fastening tapes may be attached according to the dimensions of the wearer's body shape (specifically, around the waist, around the legs, etc.). In general, a pair of disposable diapers for infants (one each on the left and right) is attached, and a pair of disposable diapers for adults (two on the left and two on the left) are attached.

  The absorptive article of the present invention can be used as an absorptive article for infants or adults such as the elderly and persons with disabilities, and more specifically, pants-type disposable diapers and tape-type disposable diapers. .

1A: Absorbent article, 2: Front body, 4: Crotch, 6: Rear body, 11: Fastening tape, 18A: Top sheet, 20: Back sheet, 22A, 22B, 22C, 22D, 22E, 22F, 22G 22H, 22I, 22J: Absorber, 24: Cover sheet, 26, 26a, 26b: Solid gather, 32: Water repellent sheet, 36: Solid gather stretchable material, 40: Leg stretchable material, 42: Waist stretchable material, 46 : Fastening member, 47: Hook material, 48: Loop material, 50A, 50B, 50C, 50D, 50E, 50F, 50G, 50H, 50I, 50J :: Absorber-encapsulated sheet, 52A: Upper sheet, 54A: Lower sheet 56A, 56B, 56C, 56D, 56E, 56F, 56G, 56H, 56I: Weak joint, 58A, 60A, 60B, 60C, 60D, 60E 60F, 60G, 60H, 60I, 60J: bag part, 62A, 62B, 62C, 62D, 62E, 62F, 62G, 62H, 62I: joint part, 66: joint part, 122: absorber, 150: tissue, 152: Upper tissue, 154: lower tissue, S1: front surface, S2: back surface, S3, S4: side surface, S5, S6: end surface, E1, E2: side edge, E3, E4: side edge, P8: cutting step.

Claims (5)

An absorber comprising fluff pulp and a superabsorbent polymer, and an absorber encapsulating sheet for encapsulating the front surface, both side surfaces and the back surface of the absorber;
The absorbent-encapsulated sheet is further extended outward in the width direction from both side edges of the absorbent body to form a bag portion, and encapsulates both side surfaces of the absorbent body by the bag portion,
Between the side edge of the bag portion and the side edge of the absorber closer to the side edge, the absorber-encapsulated sheets constituting the bag portion are mutually heat- sealed or ultrasonically fused. joined by peelable weak joint is formed,
The weakly bonded portion is formed at a position corresponding to at least a longitudinal central portion of the absorber along both side edges of the absorber .
An absorbent article in which a plurality of dot-like weak joints are formed in a band-shaped region along both side edges of the absorbent body .   2. The absorbent article according to claim 1, wherein the weakly bonded portion is formed by bonding the absorbent encapsulated sheets to each other within a range of 180 ° peel strength of 0.3 to 3.0 N. . The absorptivity according to claim 1 or 2 , wherein an interval between the weakly joined portion and a side edge of the bag portion formed by the absorbent encapsulating sheet adjacent to the weakly joined portion is within a range of 5 to 20 mm. Goods. The absorbent article as described in any one of Claims 1-3 in which the said weak junction part is formed in the position corresponding to the longitudinal direction whole region of the said absorber. The weak junction, any one of claim 1 to 4 which is formed such that there is no gap between the side edge and the weak bonding portion of the absorbent body towards the near side edge of the bag portion Absorbent article as described in 1.

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