JP6353237B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as urine pads (including light incontinence pads), sanitary napkins, disposable diapers and the like.

  DESCRIPTION OF RELATED ART Conventionally, the absorbent article which has an absorber comprised so that it may have a water absorbing resin between sheet | seat members and may not have a pulp fiber is known. For example, Patent Documents 1 to 4 disclose an absorbent article having such an absorber. Patent Document 5 discloses an absorbent body in which a water-absorbent resin is disposed between a first sheet positioned above the thickness direction and a second sheet positioned below the thickness direction, and absorbs bodily fluids. The absorber formed so that the 1st sheet may protrude rather than the 2nd sheet is indicated.

JP 2000-238161 A JP 2004-275225 A JP 2009-061230 JP2013-042882A JP 2010-063815 A

  Absorbers configured to have a water-absorbing resin between sheet members and have no pulp fibers can be formed thin because they do not contain pulp fibers. The resin swells and irregularities are easily formed on the surface of the absorber. And when a wearer's skin hits the unevenness | corrugation of the surface of the absorber formed in this way, a wearer may feel uncomfortable and there exists a possibility that a feeling of wear may deteriorate.

  The present invention has been made in view of the above circumstances, and the object thereof is an absorbent article including an absorbent body configured to have a water absorbent resin between sheet members and have no pulp fiber, An object of the present invention is to provide an absorbent article having a good wearing feeling even when urine is absorbed.

  The absorbent article of the present invention capable of solving the above problems is an absorbent article having a top sheet, a back sheet, and an absorbent body disposed between them, and the absorbent body is on the top sheet side. 5% of the upper sheet, having an upper sheet disposed on the back sheet and a lower sheet disposed on the back sheet side, having a water absorbent resin between the upper sheet and the lower sheet, and having no pulp fiber. It is characterized in that the elongation stress at the time of elongation is larger than the elongation stress at the time of 5% elongation of the lower sheet. Since the absorbent article of this invention is comprised in this way, when the water absorbing resin contained in an absorber absorbs urine etc. and swells, it will become easy to swell an absorber below the upper side. Therefore, even if the absorbent body absorbs urine or the like, it becomes difficult for large irregularities to be formed on the surface of the absorbent body on the wearer side, making it difficult for the wearer to feel uncomfortable. As a result, the wearing feeling of the absorbent article is good.

  The upper sheet is preferably made of a nonwoven fabric containing 50% by mass or more of regenerated cellulose fibers. The nonwoven fabric constituting the upper sheet mainly contains regenerated cellulose fibers, so that the upper sheet absorbs urine and the like of the upper sheet as compared with the case of mainly containing natural fibers such as pulp. It becomes easy to form a large elongation stress. Furthermore, it is preferable that the nonwoven fabric of the upper sheet does not contain pulp fibers. If the upper sheet is configured in this way, the strength of the upper sheet is increased and the elongation stress of the upper sheet can be easily increased.

  The upper sheet is made of a spunlace nonwoven fabric, the lower sheet is made of an air-through nonwoven fabric, and the elongation stress at 5% elongation relative to the fiber orientation direction of the spunlace nonwoven fabric of the upper sheet is 5 for the fiber orientation direction of the air-through nonwoven fabric of the lower sheet. It is preferable that it is larger than the elongation stress at the time of% elongation. If the upper sheet and the lower sheet are configured in this manner, urine excreted from the wearer is easily absorbed by the absorber, and urine is easily prevented from leaking from the back sheet side. .

  The elongation stress at the time of 5% elongation of the lower sheet is preferably 75% or less of the elongation stress at the time of 5% elongation of the upper sheet. If the upper sheet and the lower sheet are formed in this way, when the water-absorbent resin contained in the absorbent body absorbs urine or the like and swells, the extent to which the absorbent body swells upward is suppressed, and the absorbent body is worn. Large unevenness is difficult to be formed on the surface on the person side.

  The nonwoven fabric of the upper sheet contains 5% by mass or more and 40% by mass or less of heat-fusible fiber, and the absorber has a sealing portion formed by heat-sealing the upper sheet and the lower sheet. Is preferred. If the nonwoven fabric of the upper sheet contains heat-fusible fibers, it becomes easy to form a sealing portion by heat-sealing the upper sheet and the lower sheet. And if the sealing part is formed in the absorber, the sealing part functions as a diffusion passage for urine and the like, and the urine received by the absorber easily diffuses through the sealing part. As a result, urine and the like are quickly absorbed by the absorber, and the water absorbing ability of the water absorbent resin is easily utilized over a wide range.

  In the absorbent body, it is preferable that the upper sheet and the lower sheet are joined to form a sealing portion, and the sealing portion is arranged in a stripe shape extending in the longitudinal direction of the absorbent article. If the sealing part is formed in this way, urine or the like easily diffuses the absorbent body in the longitudinal direction through the sealing part. As a result, more of the water-absorbing resin arranged in the absorber is likely to contribute to absorption of urine and the like, and the absorption capacity of the absorber can be enhanced.

  The absorbent article of the present invention has an absorbent body configured to have a water absorbent resin between the upper sheet and the lower sheet so as not to have pulp fibers, and the elongation stress of the upper sheet of the absorbent body is lower. Since it is formed larger than the elongation stress of the sheet, when the water-absorbing resin of the absorbent body absorbs urine or the like and swells, the absorbent body tends to swell downward from the upper side. Therefore, even if the absorbent body absorbs urine or the like, it becomes difficult for large irregularities to be formed on the surface of the absorbent body on the wearer side, making it difficult for the wearer to feel uncomfortable. As a result, the wearing feeling of the absorbent article is good.

An example of the absorbent article of this invention is represented, and the top view which looked at the urine pad from the top sheet side as an absorbent article is represented. The AA sectional view of the absorptive article shown in Drawing 1 is expressed. Sectional drawing of the absorber of the absorbent article shown in FIG. 2 is represented.

  The absorbent article of the present invention includes a top sheet, a back sheet, and an absorbent body disposed between them. Examples of the absorbent article of the present invention include urine pads (including incontinence pads), disposable diapers, sanitary napkins and the like.

  The absorbent article has a longitudinal direction and a width direction. “Longitudinal direction” means a direction extending in the front-rear direction of the wearer's crotch when the absorbent article is worn. The “width direction” means a direction that is on the same plane as the absorbent article and is orthogonal to the longitudinal direction. In the present invention, the “upper side” means the wearer side when the absorbent article is worn, and the “lower side” is the side opposite to the wearer when the absorbent article is worn, that is, the outer side. Means. A direction extending from the upper side to the lower side is defined as a vertical direction.

  The shape of the absorbent article is not particularly limited. When the absorbent article is a urine pad or a sanitary napkin, the shape of the absorbent article includes a substantially rectangular shape, an hourglass shape, a gourd shape, a battledore shape, and the like.

  When the absorbent article is a disposable diaper, the absorbent article includes, for example, a front abdomen, a back part, and a crotch part provided between them and provided with an absorber. As a disposable diaper, for example, an absorbent main body in which an absorbent body is disposed between a top sheet and a back sheet is provided on the skin side surface of a pant member including a front abdomen, a back part, and a crotch part located between them. May be. At this time, a substantially rectangular shape or the like is shown as the shape of the absorbent main body. Moreover, as a disposable diaper, the laminated body by which the absorber was distribute | arranged between the top sheet | seat and the back sheet | seat may form a front part, a back part, and a crotch part located among these. In addition, a front part corresponds to the part which contacts a wearer's belly side when wearing a disposable diaper, and a back part corresponds to the part which contacts a wearer's back side when wearing a disposable diaper. A crotch part is located between a front part and a back part, and is corresponded to the part which hits a wearer's crotch.

  When the absorbent article is a disposable diaper, the disposable diaper may be an open-type disposable diaper that is provided with a pair of fastening members on the left and right sides and formed into a pants shape when worn by the fastening member, and a waist opening And a pair of legged disposable diapers in which a pair of leg openings are formed.

  The top sheet is a sheet located on the wearer side when the absorbent article is worn, and is preferably liquid permeable. As the top sheet, for example, a nonwoven fabric formed from hydrophilic fibers such as cellulose, rayon, and cotton, and a hydrophobic property such as polyolefin (eg, polypropylene, polyethylene), polyester (eg, PET), polyamide (eg, nylon), etc. A non-woven fabric formed from fibers, in which the surface of hydrophobic fibers is hydrophilized with a surfactant, can be used. As the top sheet, a woven fabric, a knitted fabric, a perforated plastic film, or the like may be used.

  The back sheet is a sheet located on the side opposite to the wearer when the absorbent article is worn, that is, on the outside, and is preferably liquid-impermeable. As the back sheet, a non-woven fabric formed from hydrophobic fibers such as polyolefin (for example, polypropylene, polyethylene), polyester (for example, PET), polyamide (for example, nylon), a plastic film, or the like can be used. Moreover, you may use the laminated body of a nonwoven fabric and a plastic film. In the present invention, the liquid impermeability includes the meaning of water repellency.

  The pant member may be liquid permeable or liquid impermeable, and a sheet material usable for a top sheet or a back sheet can be used. The pant member is preferably formed by laminating the outer sheet on the inner sheet, and more preferably formed by laminating the liquid-impermeable outer sheet on the hydrophilic inner sheet.

  When using a nonwoven fabric as each sheet material demonstrated above, it is preferable to use a spunbond nonwoven fabric, an air through nonwoven fabric, a point bond nonwoven fabric, a melt blown nonwoven fabric, an airlaid nonwoven fabric, an SMS nonwoven fabric, etc. as a nonwoven fabric.

  The absorber is provided between the top sheet and the back sheet. The absorber has an upper sheet disposed on the top sheet side and a lower sheet disposed on the back sheet side, and has a water-absorbing resin between the upper sheet and the lower sheet and no pulp fibers. . That is, in the absorbent body, the water absorbent resin is disposed between the upper sheet and the lower sheet, but the pulp fiber is not disposed between these sheets. In the absorbent body, the presence of pulp fibers inevitably mixed in the production is allowed. Since the absorbent body has a water absorbent resin between the upper sheet and the lower sheet and does not have pulp fibers, the absorbent body can be formed thin while having a high absorption capacity.

  The upper sheet and the lower sheet are preferably liquid permeable. For example, nonwoven fabrics formed from hydrophilic fibers such as pulp, rayon, and cotton, polyolefins (for example, polypropylene, polyethylene), polyesters (for example, PET) A non-woven fabric formed from hydrophobic fibers such as polyamide (for example, nylon), the surface of the hydrophobic fibers being hydrophilized with a surfactant can be used. Moreover, you may use a woven fabric, a knitted fabric, a perforated plastic film etc. as an upper sheet and a lower sheet. Preferably, a nonwoven fabric sheet member (nonwoven fabric sheet) is used as the upper sheet and the lower sheet. As the nonwoven fabric, it is preferable to use a spunlace nonwoven fabric, an air-through nonwoven fabric, a spunbond nonwoven fabric or the like.

  Examples of water-absorbing resins include polyacrylic acid-based water-absorbing resins such as sodium polyacrylate; starch-acrylic graft copolymers, starch-acrylic acid graft copolymers, starch-acrylamide graft copolymers, and other starch-based water-absorbing resins. Water-absorbing resin: Polyvinyl alcohol-based water-absorbing resin such as crosslinked polyvinyl alcohol can be used. As the water-absorbing resin, it is preferable to use a polyacrylic acid-based water-absorbing resin such as sodium polyacrylate because it has a high liquid absorption.

  The shape (planar shape) of the absorber is not particularly limited. What is necessary is just to determine the shape of an absorber suitably according to a use, for example, substantially rectangular shape, hourglass shape, gourd shape, a battledore shape, etc. are mentioned. In addition, it is preferable that an absorber is a substantially rectangular shape from the point of manufacture ease.

  The absorber is configured such that the elongation stress when the upper sheet is stretched by 5% is larger than the elongation stress when the lower sheet is stretched by 5%. That is, the lower sheet is formed more easily than the upper sheet. The elongation stress is measured by extending the upper sheet and the lower sheet in the longitudinal direction of the absorbent article according to JIS L 1913 6.3.1 (2004 edition). At this time, the holding interval of the tensile tester is set to 100 mm, and the load at the time of 5% elongation when each sheet is pulled at a tensile speed of 300 mm / min is obtained as the elongation stress at the time of 5% elongation. Since the absorbent article of this invention is comprised in this way, when the water absorbing resin contained in an absorber absorbs urine etc. and swells, it will become easy to swell an absorber below the upper side. Therefore, even if the absorbent body absorbs urine or the like, it becomes difficult for large irregularities to be formed on the surface of the absorbent body on the wearer side, making it difficult for the wearer to feel uncomfortable. As a result, the wearing feeling of the absorbent article is good.

  The elongation stress at the time of 5% elongation of the lower sheet is preferably 75% or less of the elongation stress at the time of 5% elongation of the upper sheet, more preferably 65% or less, and further preferably 60% or less. If the upper sheet and the lower sheet are formed in this way, when the water-absorbent resin contained in the absorbent body absorbs urine or the like and swells, the extent to which the absorbent body swells upward is suppressed, and the absorbent body is worn. Large unevenness is difficult to be formed on the surface on the person side. On the other hand, the lower limit of the ratio of the elongation stress of the lower sheet to the upper sheet is not particularly limited, but the elongation stress at the time of 5% elongation of the lower sheet is preferably 20% or more of the elongation stress at the time of 5% elongation of the upper sheet. 30% or more is more preferable, and 40% or more is more preferable. If the upper sheet and the lower sheet are formed in this way, when the water-absorbent resin contained in the absorbent body swells by absorbing urine or the like, the absorbent body does not excessively swell downward, and the absorbent body It becomes difficult to be distorted unintentionally.

  Although the specific value of the elongation stress at the time of 5% elongation of the upper sheet and the lower sheet is not particularly limited, the elongation stress at the time of 5% elongation of the upper sheet and the lower sheet is, for example, preferably 1N or more, and 2N or more. Is more preferable, 20N or less is preferable, 15N or less is more preferable, and 10N or less is more preferable.

  In order to form the upper sheet so that the elongation stress at the time of 5% elongation is larger than the elongation stress at the time of 5% elongation of the lower sheet, the materials constituting the upper sheet and the lower sheet may be appropriately selected. . For example, the basis weight of the upper sheet may be made larger than that of the lower sheet, or the upper sheet may be made of a material that is difficult to stretch. When the upper sheet and the lower sheet are non-woven sheets, the lower sheet can be made easier to stretch than the upper sheet by changing the constituent material and the forming method of the non-woven fabric.

  The upper sheet and the lower sheet are preferably made of nonwoven fabric. That is, the upper sheet and the lower sheet are preferably nonwoven fabric sheets. If the upper sheet and the lower sheet are made of non-woven fabric, it is easy to form a lower elongation stress on the lower sheet while increasing the permeability of the upper sheet such as urine.

  The upper sheet is preferably made of a nonwoven fabric containing 50% by mass or more of natural fibers such as pulp and / or regenerated cellulose fibers such as rayon. More preferably, the nonwoven fabric of the upper sheet contains 60% by mass or more of natural fibers and / or regenerated cellulose fibers, more preferably 70% by mass or more, and preferably 95% by mass or less, and 90% by mass. It is more preferable to contain the following. If the upper sheet is configured in this way, urine and the like excreted from the wearer are easily absorbed by the upper sheet, and the absorbent capacity of the absorber is improved.

  The upper sheet is preferably made of a nonwoven fabric containing 50% by mass or more of regenerated cellulose fibers such as rayon. When the non-woven fabric constituting the upper sheet mainly contains regenerated cellulose fibers instead of natural fibers such as pulp, it is easy to increase the elongation stress of the upper sheet while enhancing the urine absorption capacity of the upper sheet. Since pulp fibers are generally obtained by pulverizing pulp, the fiber length is relatively short, whereas regenerated cellulose fibers are obtained by resynthesis from natural cellulose such as pulp. Is generally longer. Therefore, when comparing a nonwoven fabric containing pulp fibers with a nonwoven fabric containing regenerated cellulose fibers, the latter is stronger than the former and has a higher elongation stress, although the hydrophilicity does not change significantly. It becomes possible to form. Therefore, it becomes easy to obtain an absorbent body in which the upper sheet has a greater elongation stress than the lower sheet. Moreover, when the nonwoven fabric which comprises an upper sheet mainly contains not only natural fibers, such as a pulp, but a regenerated cellulose fiber, the texture of an upper sheet can also be improved. More preferably, the nonwoven fabric of the upper sheet contains 60% by mass or more of regenerated cellulose fibers, more preferably 70% by mass or more, and preferably 95% by mass or less. As regenerated cellulose fiber, it is typically preferable to use rayon.

  The nonwoven fabric of the upper sheet preferably does not contain pulp fibers. If the nonwoven fabric of the upper sheet does not contain pulp fibers, the strength of the upper sheet is increased, and the elongation stress of the upper sheet can be easily increased.

  The nonwoven fabric of the upper sheet may contain heat-fusible fibers. Examples of the heat-fusible fiber include polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as PET, and polyamide fibers such as nylon. If the nonwoven fabric of the upper sheet contains heat-fusible fibers, it becomes easy to form a sealing portion by heat-sealing the upper sheet and the lower sheet. Details of the sealing portion will be described later. When the nonwoven fabric of the upper sheet contains heat-fusible fibers, the nonwoven fabric of the upper sheet preferably contains 5% by mass or more of heat-fusible fibers, and more preferably contains 10% by mass or more. Moreover, from the point which improves the touch of an upper sheet, it is preferable that the nonwoven fabric of an upper sheet contains 40 mass% or less of heat-fusible fiber, it is more preferable to contain 30 mass% or less, and 25 mass% or less is contained. More preferably. In addition, when the nonwoven fabric of an upper sheet is comprised from a heat-fusible fiber, it is preferable that the nonwoven fabric of an upper sheet is formed from the 2 or more types of heat-fusion fiber which has different melting | fusing point, and thereby, the intensity | strength of a nonwoven fabric is improved. The touch can be improved while increasing.

  The configuration of the lower sheet is not particularly limited. When the lower sheet is composed of a nonwoven fabric, the nonwoven fabric of the lower sheet may contain natural fibers such as pulp or regenerated cellulose fibers such as rayon, and may contain heat-fusible fibers. . Since the lower sheet is not required to absorb urine and the like as quickly as the upper sheet, it does not have to contain natural fibers such as pulp or regenerated cellulose fibers such as rayon. Further, when the lower sheet is heat-sealed with the upper sheet, the lower sheet preferably contains heat-fusible fibers. The lower sheet may be made of a plastic film instead of the nonwoven fabric.

  When the upper sheet and the lower sheet are made of a nonwoven fabric in which constituent fibers such as spunlace nonwoven fabric, air-through nonwoven fabric, and spunbond nonwoven fabric are oriented in one direction, these nonwoven fabrics have constituent fibers oriented in the longitudinal direction of the absorbent article. Preferably it is. When the absorbent article is worn, the absorbent article is more strongly pulled in the longitudinal direction and is easily loaded. On the other hand, the nonwoven fabric in which the constituent fibers are oriented in one direction tends to have higher strength with respect to the orientation direction of the fibers. Therefore, if the constituent fibers of the nonwoven fabric of the upper sheet and the lower sheet are oriented in the longitudinal direction of the absorbent article, the upper sheet and the lower sheet are not easily broken. In particular, when the absorbent article is worn, even if the upper sheet or the lower sheet expands due to the water absorbent resin contained in the absorbent body absorbing urine or the like to swell, the upper sheet or the lower sheet breaks. It becomes difficult to do.

  The orientation direction of the constituent fibers of the nonwoven fabric can be confirmed by observing the surface of the nonwoven fabric with a microscope or the like. For example, a spunbonded nonwoven fabric can be obtained by melting a polymer raw material, extruding it from a spinneret, stretching it, and accumulating it on a conveyor belt or the like and forming it into a web shape. The accumulated webs (fibers) are arranged along the traveling direction of the conveyor belt. Therefore, in this case, the web (fiber) is oriented along the traveling direction (MD direction) of the conveyor belt. For air-through nonwoven fabrics and spunlace nonwoven fabrics, when producing nonwoven fabrics, the orientation direction of the constituent fibers is aligned by appropriately setting the method of collecting the raw short fibers during fiber lump formation and the method of opening fibers during web formation. Can do.

  The upper sheet is preferably made of a spunlace nonwoven fabric. If the upper sheet is made of a spunlace nonwoven fabric, urine excreted from the wearer is easily absorbed by the upper sheet. In particular, even if urine or the like is excreted a plurality of times, the ability to absorb urine or the like by the upper sheet can be suitably maintained. As a result, urine and the like are suitably absorbed by the absorber.

  The lower sheet is preferably made of an air-through nonwoven fabric. If the lower sheet is composed of an air-through nonwoven fabric, the lower sheet is formed bulky, and the retention capacity of urine and the like by the lower sheet can be enhanced. Therefore, even if urine or the like moves to the lower sheet side of the absorber, urine or the like is held by the lower sheet, and it is easy to prevent urine or the like from leaking from the back sheet side. Moreover, the cushioning property by the lower seat can be enhanced.

  When the upper sheet is made of spunlace nonwoven fabric and the lower sheet is made of air-through nonwoven fabric, the upper sheet has an elongation stress at 5% elongation relative to the fiber orientation direction of the spunlace nonwoven fabric, and the fiber orientation direction of the air-through nonwoven fabric of the lower sheet It is preferable that it becomes larger than the elongation stress at the time of 5% elongation. In this case, it is preferable that the fibers of the spunlace nonwoven fabric and the air-through nonwoven fabric are oriented in the longitudinal direction of the absorbent article. If the upper sheet and the lower sheet are configured in this way, the upper sheet and the lower sheet are less likely to break when the absorbent article is used, and the absorbent body absorbs urine or the like. Large unevenness is less likely to be formed on the surface of the wearer, and the wearing feeling of the absorbent article is improved.

  The absorber preferably has a sealing portion formed by joining the upper sheet and the lower sheet. In this case, it is preferable that the non-sealing portion where the upper sheet and the lower sheet are not joined is provided with a water-absorbing resin to form an absorption region. The sealing portion is formed by joining the upper sheet and the lower sheet with an adhesive or heat-sealing (heat sealing or ultrasonic bonding). The sealing portion is defined as a portion where the upper sheet and the lower sheet are joined, and the presence of the water absorbent resin in the sealing portion is allowed. If the sealing part is formed in the absorber, the sealing part functions as a diffusion passage for urine and the like, and the urine received by the absorber easily diffuses through the sealing part. As a result, urine and the like are quickly absorbed by the absorber, and the water absorbing ability of the water absorbent resin is easily utilized over a wide range.

  When the sealing portion is formed by application of an adhesive, examples of the adhesive include rubber adhesives (for example, natural rubber, butyl rubber, polyisoprene, etc.) and styrene elastomers (for example, styrene-isoprene-styrene blocks). Copolymer (SIS), Styrene-butadiene-styrene block copolymer (SBS), Styrene-ethylene-butadiene-styrene block copolymer (SEBS), Styrene-ethylene-propylene-styrene block copolymer (SEPS), etc. ) Is preferably used. By using such an adhesive, even if the absorber absorbs urine or the like, the bonding between the upper sheet and the lower sheet is sufficiently maintained.

  It is also preferable that the sealing portion is formed by heat-sealing the upper sheet and the lower sheet. If the sealing portion is formed in this way, the upper sheet and the lower sheet are more strongly bonded. When the sealing portion is formed by heat-sealing the upper sheet and the lower sheet, the upper sheet and the lower sheet are preferably composed of a nonwoven fabric or a plastic film containing heat-fusible fibers, By configuring the upper sheet and the lower sheet in this manner, the upper sheet and the lower sheet can be easily heat-sealed suitably.

  It is also preferable that the sealing portion is released from the bonding between the upper sheet and the lower sheet when the absorbent body absorbs urine and the like and swells to a certain thickness. If the sealing part is formed in this way, the absorbent body absorbs urine and the like repeatedly, so that the joining of the sealing part is released, and a space in which the water-absorbing resin swells is secured. As a result, the water absorbing ability of the water absorbent resin disposed in the absorber is easily utilized. For example, the peel strength of the sealing portion is preferably 0.5N or more, preferably 10N or less, more preferably 7N or less, and further preferably 3N or less. The peel strength of the sealing portion is measured in accordance with the peel adhesion strength test method (T-shape peel) of JIS K 6854-3 (2008 version) in a state before the absorbent body absorbs water. However, the test piece is cut out with a width of 50 mm, and the peeling speed is set at 300 mm / min.

  In order to adjust the peeling force of the sealing portion to the above range, it is preferable to join the upper sheet and the lower sheet by heat fusion with a relatively weak bonding force. In that respect, as explained above, the upper sheet contains 50 mass% or more and 95 mass% or less of natural fiber and / or regenerated cellulose fiber, and contains 5 mass% or more and 40 mass% or more of heat-fusible fiber. It is preferable that it consists of the nonwoven fabric to do.

  The sealing portions are preferably arranged in a stripe shape extending in the longitudinal direction. Specifically, it is preferable that three or more sealing portions are provided side by side in the width direction so as to extend in the longitudinal direction. If the sealing part is formed in this way, urine or the like easily diffuses the absorbent body in the longitudinal direction through the sealing part. As a result, more of the water-absorbing resin arranged in the absorber is likely to contribute to absorption of urine and the like, and the absorption capacity of the absorber can be enhanced.

The amount of the water absorbent resin which is arranged in the absorbent region is not particularly limited, 100 g / ^{m 2} or more, more preferably 150 g / ^{m 2} or more, preferably 400 g / ^{m 2} or less, and more is 385 g / ^{m 2} or less preferable. If the water-absorbing resin is disposed in the absorption region in an amount of 100 g / m ² or more, the absorption capacity of the absorber can be easily increased. On the other hand, if the water-absorbing resin is disposed in the absorption region in an amount of 400 g / m ² or less, the absorbing ability of the water-absorbing resin disposed in the absorption region is easily utilized efficiently.

  In the absorber, the water absorbent resin is preferably fixed to the upper sheet and / or the lower sheet with an adhesive. That is, it is preferable that an adhesive is applied to the upper sheet and / or the lower sheet to provide an adhesive layer, and the water absorbent resin is fixed to the upper sheet and / or the lower sheet with the adhesive layer. The adhesive layer may be provided on at least one of the upper sheet and the lower sheet of the water-absorbent resin. Preferably, the adhesive layer is provided on both the upper sheet and the lower sheet. It is sufficient that at least a part of the water absorbent resin is fixed to the adhesive layer. For example, the water absorbent resin in contact with the adhesive layer may be fixed to the adhesive layer. If the water absorbent resin is fixed to the upper sheet and / or the lower sheet by the adhesive layer, the water absorbent resin is less likely to move between the upper sheet and the lower sheet before water absorption of the water absorbent resin, Absorption capacity of urine or the like in the absorption layer is easily secured. Even after water absorption of the water-absorbent resin, the gelled water-absorbent resin is less likely to move between the sheet members. As a result, the water-absorbent resin becomes a lump and the wearer is less likely to feel uncomfortable.

  It is preferable that the adhesive layer does not inhibit water absorption or swelling by the water absorbent resin while fixing the water absorbent resin. From this point, the adhesive layer is preferably provided in an intermittent pattern. For example, the adhesive layer is preferably formed by applying the adhesive in a net shape, a stripe shape, or a dotted shape. When the adhesive layer is formed in a net shape, the adhesive may be applied by a curtain spray method, a spiral coating method, an omega coating method, or the like.

  As the adhesive that forms the adhesive layer, an adhesive that can be used to form the sealing portion as described above can be used. Further, the sealing portion may be formed by the adhesive layer. In this case, the upper sheet and the lower sheet are joined by the adhesive layer, thereby forming a sealing portion.

  The absorbent article of the present invention may be provided by laminating a plurality of the absorbers described above. Moreover, absorbers other than those described above may be provided. For example, an auxiliary absorber may be provided as another absorber below the absorber. In this case, the auxiliary absorbent preferably contains hydrophilic fibers (pulp fibers, cellulose fibers, etc.) and a water-absorbent resin, thereby enhancing the effect of preventing leakage of urine and the like from the backsheet side. In the absorbent article of the present invention, the absorber described above is preferably provided on the top sheet side most as the absorber, for example, a diffusion sheet (under the top sheet or the top sheet) It is provided adjacent to the second sheet).

  The absorbent article may be provided with rising flaps on both sides in the width direction. By providing the rising flap, side leakage of urine and the like is prevented. The rising flap is formed, for example, by joining side sheets extending in the longitudinal direction on both sides in the width direction of the top sheet and providing an elastic member inward in the width direction of the side sheet. By providing the side sheet and the elastic member in this manner, the inner side in the width direction of the side sheet rises toward the wearer's skin due to the contraction force of the elastic member, and a rising flap is formed. The rising flap or the side sheet is preferably composed of a liquid-impermeable plastic film, a liquid-impermeable nonwoven fabric, or the like.

  As the elastic member provided on the rising flap, an elastic stretchable material used for ordinary absorbent articles such as polyurethane yarn, polyurethane film, natural rubber, and the like can be used. The elastic member is preferably fixed in a stretched state with a hot melt adhesive. For example, a polyurethane yarn having a fineness of 40 to 1,240 dtex is stretched and arranged at a magnification of 1.1 to 5.0 times and fixed. As the joining means, a rubber-based hot melt adhesive is preferably used. The magnification is 1.0 in the non-expanded state.

  The absorbent article of the present invention will be described with reference to FIGS. 1 to 3 by taking a urine pad as an example. In addition, the absorbent article of this invention is not limited to the embodiment shown by drawing. FIG. 1: shows the top view which looked at the urine pad as an absorbent article from the top sheet side. FIG. 2 is a cross-sectional view taken along line AA of the absorbent article shown in FIG. FIG. 3 shows a cross-sectional view of the absorbent body of the absorbent article shown in FIG.

  The absorbent article 1 includes a top sheet 2, a back sheet 3, and an absorbent body 11 provided therebetween. The top sheet 2 is arranged so as to face the wearer's skin, and transmits body fluid such as urine. The body fluid that has passed through the top sheet 2 is accommodated in the absorber 11. The back sheet 3 is liquid impermeable and prevents body fluid from leaking outside.

  The absorber 11 includes an upper sheet 12 disposed on the top sheet 2 side and a lower sheet 13 disposed on the back sheet 3 side. A water absorbent resin 15 is disposed between the upper sheet 12 and the lower sheet 13, and no pulp fiber is disposed between the upper sheet 12 and the lower sheet 13. The absorber 11 is formed so that the extension stress when the upper sheet 12 is extended by 5% is larger than the extension stress when the lower sheet 13 is extended by 5%. Therefore, when the water absorbent resin 15 of the absorbent body 11 absorbs urine or the like and swells, the absorbent body 11 easily swells downward from the upper side, and as a result, large irregularities are formed on the surface of the absorbent body 11 on the top sheet 2 side. Is less likely to be formed, the wearer is less likely to feel discomfort, and the wearing feeling of the absorbent article 1 is good.

  In the absorbent body 11 shown in the drawing, an adhesive is applied to the upper sheet 12 to form an adhesive layer 14, and the water absorbent resin 15 is fixed to the upper sheet 12 and the lower sheet 13 by the adhesive layer 14. . In the absorbent body 11, a sealing portion 16 is formed at a portion where the upper sheet 12 and the lower sheet 13 are joined, and a non-sealing portion 17 is formed at a portion where the upper sheet 12 and the lower sheet 13 are not joined. ing. The sealing portion 16 is formed, for example, by joining the upper sheet 12 and the lower sheet 13 to each other by the adhesive layer 14 and thermally fusing the upper sheet 12 and the lower sheet 13 together. The non-sealing part 17 is provided with a water absorbent resin 15 to form an absorption region. In the drawing, the sealing portions 16 and the non-sealing portions 17 extend in the longitudinal direction y and are provided alternately in the width direction x.

  It is preferable that an upper mount 4 is provided between the top sheet 2 and the absorbent body 11. Moreover, it is preferable that the lower mount 5 is provided between the back sheet 3 and the absorber 11. The upper mount 4 and the lower mount 5 are provided in order to improve the diffusibility of body fluids such as urine and to prevent the absorbent article 11 from being deformed. The upper mount 4 is preferably liquid permeable, and the lower mount 5 may be liquid permeable or liquid impermeable. As the upper mount 4 and the lower mount 5, tissue paper, crepe paper, or the like can be used.

  The absorbent article 11 is preferably provided with side sheets 6 extending in the longitudinal direction y on both sides in the width direction x of the top sheet 2. The side sheets 6 are joined to both sides of the top sheet 2 in the width direction x. 1 and 2, the side seat 6 is provided with three standing elastic members 7 inward in the width direction x. When the absorbent article 11 is used, the inner side of the side seat 6 rises toward the wearer's skin due to the contraction force of the standing elastic member 7, thereby forming a rising flap to prevent lateral leakage of excrement such as urine. Is done.

1: Absorbent article 2: Top sheet 3: Back sheet 11: Absorbent body 12: Upper sheet 13: Lower sheet 15: Water absorbent resin 16: Sealing portion

Claims (6)

An absorbent article having a top sheet, a back sheet, and an absorbent body disposed therebetween,
The absorber has an upper sheet disposed on the top sheet side and a lower sheet disposed on the back sheet side, and has a water absorbent resin between the upper sheet and the lower sheet. Without pulp fibers,
An absorbent article, wherein the lower sheet has an elongation stress at 5% elongation of 20% to 75% of the elongation stress at 5% elongation of the upper sheet .   The absorbent article according to claim 1, wherein the upper sheet is made of a nonwoven fabric containing 50% by mass or more of regenerated cellulose fibers. The nonwoven fabric of the upper sheet contains 5% by mass or more and 40% by mass or less of heat-fusible fiber,
The absorbent article according to claim 2, wherein the absorbent body has a sealing portion formed by heat-sealing the upper sheet and the lower sheet.   The absorbent article according to claim 2 or 3, wherein the nonwoven fabric of the upper sheet does not contain pulp fibers. The upper sheet is made of spunlace nonwoven fabric, the lower sheet is made of air-through nonwoven fabric,
The extension stress at the time of 5% extension with respect to the fiber orientation direction of the spunlace nonwoven fabric of the upper sheet is larger than the extension stress at the time of 5% extension with respect to the fiber orientation direction of the air-through nonwoven fabric of the lower sheet. An absorbent article according to any one of the above. In the absorbent body, the upper sheet and the lower sheet are joined to form a sealing portion,
The absorbent article as described in any one of Claims 1-5 by which the said sealing part is arrange | positioned at the stripe form extended in the longitudinal direction of an absorbent article.