JP2004121701A - Absorptive article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorptive article with liquid leakage preventing performance to prevent the leakage of a liquid, especially, which flows along a body surface, by reliably introducing the liquid to an absorptive body. <P>SOLUTION: This absorptive article includes a front surface sheet 2 comprising: a fiber layer 5 facing the skin of a wearing person; and a base material layer 6 to be arranged at the side of the absorptive body 4. The fiber layer 5 is partially joined with the base material layer 6, so as to form a plurality of joint parts 7. A plurality of projected loop parts 8 are formed toward the skin of the wearer in a part other than the joint parts 7 concerning the fiber layer 5. A group of loop parts 8 positioned in a prescribed area on the front surface sheet 2 is inclined and oriented in one prescribed direction. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an absorbent article such as a sanitary napkin or a panty liner, and more particularly to an absorbent article having a high effect of preventing liquid leakage, having an excellent salat feeling, and having a good feel given to a wearer.
[0002]
Problems to be solved by the prior art and the invention
It has a liquid-permeable base material and a filament layer provided on the surface of the base material, and the two parts are partially bonded to form a plurality of bonding parts. An absorbent article including a surface layer in which a filament forms a loop portion is known (see Patent Document 1). This absorbent article is intended to make the loop portion of the continuous filament follow the movement of the body, thereby suppressing irritation to the skin, and increasing the permeability to the absorbent layer and suppressing liquid return.
[0003]
However, since the loop portion is evenly upwardly projected, that is, symmetrically protruded, when the body is turned sideways or on its back, such as when sleeping, it absorbs liquid flowing on the body surface and suppresses the flow. Poor effect. In addition, when a pressure due to a wearing pressure or a movement of the body is applied to the loop portions, each loop portion is independently inclined in various directions. As a result, the touch becomes worse, and the liquid absorbability also worsens.
[0004]
Apart from the above-mentioned Patent Document 1, a nonwoven fabric or a film is folded in the longitudinal direction of the absorbent article to form folded folds on both sides at the center of the upper surface of the absorbent surface, and the folds are facing the center side. Are known (see Patent Documents 2 and 3). This topsheet is intended to prevent lateral leakage by forming the folds toward the center side, and to improve the fit to the body by the bellows structure of the folds.
[0005]
However, since the pleats are continuous in the longitudinal direction of the absorbent article, when the body is turned sideways, such as at bedtime, the liquid tends to flow in the longitudinal direction along the pleats, and the leakage prevention effect is sufficient. Not very high.
[0006]
[Patent Document 1]
JP-A-2002-65736
[Patent Document 2]
JP-A-6-142134
[Patent Document 3]
JP-A-6-169948
[0007]
Accordingly, an object of the present invention is to provide an absorbent article having excellent liquid leakage prevention properties, particularly excellent performance for reliably guiding liquid flowing along a body surface to an absorber to prevent liquid leakage.
Another object of the present invention is to provide an absorbent article having a good touch and a high cushion feeling.
[0008]
[Means for Solving the Problems]
The present invention has a fiber layer directed to the skin side of the wearer and a base layer disposed on the absorber side, and the fiber layer and the base layer are partially joined to form a large number of joints. Portion is formed, the fiber layer is an absorbent article having a surface sheet forming a large number of loop portions convex toward the skin side of the wearer in a portion other than the joint portion,
The object has been achieved by providing an absorbent article in which a group of loop portions located in a predetermined region of the topsheet is inclined and oriented in one predetermined direction.
[0009]
Further, the present invention has a fiber layer directed to the skin side of the wearer and a base material layer disposed on the absorber side, and the fiber layer and the base material layer are partially joined to form a large number. A joint portion is formed, and the fiber layer is a topsheet for an absorbent article having a large number of loop portions that are convex toward the skin side of the wearer in a portion other than the joint portion,
It is an object of the present invention to provide a topsheet for an absorbent article in which a group of loop portions located in a predetermined region of the topsheet is inclined and oriented in a predetermined direction.
[0010]
The present invention is also a method for producing the topsheet,
The fiber layer and the substrate layer having heat shrinkage are overlapped, a joining step of partially joining the two at a large number of the joints, and shrinking the substrate layer by applying heat after joining, A loop portion forming step of forming a loop portion by raising the fiber layer located between the adjacent bonding portions to the opposite side to the base material layer,
The bonding portion formed in the bonding step includes a strong bonding region and a weak bonding region, such that the strong bonding region and the weak bonding region are arranged along a shrinking direction of the base material layer. An object of the present invention is to provide a method of manufacturing a topsheet that forms each of these joining regions.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 is a perspective view of a sanitary napkin as one embodiment of the absorbent article of the present invention, and FIG. 2 is a sectional view taken along line II-II in FIG.
[0012]
As shown in FIGS. 1 and 2, the napkin 1 of the present embodiment has a vertically long shape, and has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid interposed between the two sheets. It has a retaining absorber. As the back sheet 3 and the absorber 4, those similar to those conventionally used in this type of absorbent article can be used. What is described below is used as the topsheet 2.
[0013]
The topsheet 2 has a filament layer 5 directed to the skin side of the wearer and a base layer 6 disposed on the absorber 4 side, and the filament layer 5 and the base layer 6 are partially bonded. Thus, a large number of joints 7 are formed. The filament layer 5 has a large number of loop portions 8 protruding toward the skin side of the wearer in portions other than the joint portions 7. For simplicity, in FIG. 1, the loop portion 8 is illustrated only in the central portion of the napkin 1, but the loop portion is actually formed on the entire area of the skin contact surface of the napkin 1.
[0014]
The filament layer 5 is composed of a tow of a large number of filaments, and each filament extends substantially in one direction when the topsheet 2 is viewed in plan (hereinafter, this direction is also referred to as the X direction of the topsheet). The X direction of the topsheet is the same as the sheet flow direction (mechanical direction) when the topsheet 2 is manufactured, and is the same as the longitudinal direction of the napkin 1 when assembled in the napkin 1.
[0015]
FIG. 3 is a partially enlarged plan view of a part of the topsheet shown in FIG. 2 as viewed from the filament layer side. As shown in FIG. 3, the filament layer 5 and the base material layer 6 mutually move in the X direction of the topsheet 2 and in the direction perpendicular to the X direction in the plane of the topsheet 2 (hereinafter, also referred to as Y direction). Each is intermittently joined, whereby a large number of joints 7 are formed in a staggered manner in plan view. The joints 7 are formed by partially heat-sealing the filament layer 5 and the base material layer 6, and a large number of joints 7 in series in the X direction and the Y direction of the topsheet 2 are each at the same pitch. It is. The outer shape of each joint 7 is rectangular in plan view.
[0016]
As shown in FIG. 2, the filament layer 5 faces the wearer's skin side in a portion other than the joints 7, specifically, in a portion located between the joints 7 adjacent to each other in the X direction. The overhanging portion protrudes greatly in the direction, and the overhanging portion forms a loop portion 8 having a space inside. The loop portion 8 is not formed continuously in the longitudinal direction of the napkin 1, nor is it formed continuously in the width direction. In other words, the respective loop portions 8 are arranged such that, when focusing on any one of the loop portions, other loop portions are located before, after, left and right of the loop portion. As a result, unlike the absorbent articles described in Patent Literatures 2 and 3 described in the section of the related art, the napkin 1 of the present embodiment does not have a disadvantage that the liquid flows easily along the loop portion 8.
[0017]
As shown in FIGS. 1 and 2, each loop portion 8 is inclined in one direction from the rear region R of the napkin 1 toward the front region F. That is, as shown in FIG. 2, when the filament layer 5 is viewed along the longitudinal direction of the napkin 1, the loop portion 8 formed from the filament layer 5 is not symmetrical with respect to a perpendicular passing through the vertex. , The napkin 1 has an asymmetric shape inclined toward the front region F. The top of the loop portion 8 has the lowest fiber density, and the fiber density gradually increases toward the joining portion 7.
[0018]
Since the loop portion 8 is inclined toward the front region F of the napkin 1, the following advantageous effects are obtained. First, due to the presence of the loop portion 8, the loop portion 8 fits the body surface of the wearer, and a gap is hardly generated between the topsheet 2 and the body surface. In particular, women often take a supine posture while sleeping, and in such a posture, the body pressure applied to the napkin is reduced and a gap is easily generated between the surface sheet of the napkin and the body surface as a result, Since the loop portion 8 is formed as in the present embodiment, a gap hardly occurs even in such a posture. In addition, for example, when the liquid excreted at bedtime flows along the body surface, the inclined loop portion 8 becomes a physical barrier to the flow, and the liquid flows further along the body surface. Is prevented. This state is shown in FIG. FIG. 4 shows the orientation of the loop portion 8 in a posture in which the wearer is lying down, and the vertical direction in the figure corresponds to the vertical direction.
[0019]
As shown in FIG. 4, the liquid whose flow is blocked by the loop portion 8 is absorbed by the loop portion 8. As described above, the loop portion 8 has the lowest fiber density at the apex thereof, and the fiber density gradually increases toward the joining portion 7, so that the liquid absorbed by the loop portion 8 exerts a capillary force. Further, the liquid absorbed by the loop portion 8 due to the action of gravity is quickly drawn from the top toward the joint portion 7 and further smoothly guided to the absorber 4 through the base material layer 6. As described above, according to the napkin 1 of the present embodiment, the liquid flowing in the direction of gravity along the body surface is reliably guided to the absorber 4 through the loop portion 8 even during bedtime when the mounting pressure is low, and the liquid leaks. Is very effectively prevented. In addition, the remaining liquid in the loop section 8 is reduced. Further, since the convex loop reduces the contact area with the skin, the salut feeling of the topsheet 2 is improved in combination with the small remaining liquid. In contrast, in the absorbent article described in Patent Document 1 described in the section of the prior art, the orientation of the fibers in the loop portion is orthogonal to the direction of gravity when the wearer is lying down. Becomes difficult to work, and the loop cannot reliably absorb the liquid. As a result, the liquid flows along the body surface in the direction of gravity or stays in the loop portion, so that an unpleasant sticky feeling is likely to occur.
[0020]
In addition to the above-mentioned effects, there is also an advantage that the feel of the topsheet 2 becomes extremely good because the loop portions 8 are all inclined in one direction. That is, the topsheet 2 has a good smooth feeling as if the hair were combed in one direction. Conversely, when the skin is slid in the direction opposite to the direction in which the loop portion 8 is inclined, a high frictional force is generated, so that there is also an advantage that the displacement of the napkin 1 is effectively prevented. Further, the loop portion 8 is formed in an arch shape and has a high resilience to compression, so that the cushion feeling is also good.
[0021]
From the viewpoint of effectively exhibiting the various effects described above, the loop portion 8 preferably has the following shape. That is, as shown in FIG. 5, when considering a base line B and a perpendicular bisector V of the base line B drawn between two adjacent joint portions 7 along the inclination direction of the loop portion 8, Regarding the inclination direction, the area of a region R1 surrounded by the curve drawn by the loop portion 8 located on the rear side R of the perpendicular bisector V, the perpendicular bisector V, and the base line B is A1, When the area of the region R2 surrounded by the curve drawn by the loop portion 8 positioned on the front side F of the vertical bisector V, the vertical bisector V, and the base line and B is A2, A2 / A1 Is preferably from 1.5 to 15, particularly preferably from 2 to 10.
[0022]
It is preferable that the loop portion 8 has a height of 1 to 5 mm, particularly 1 to 3 mm based on the upper surface of the joining portion 7, from the viewpoint of the appearance of a cushion feeling by the loop portion 8 and the improvement of the fit and the absorption performance. . In addition, the loop portion 8 preferably has a pitch in the longitudinal direction of the napkin 1 of 2 to 20 mm, particularly 3 to 10 mm, from the viewpoint of smoothness of the surface, development of good touch, and improvement of the absorption performance of the loop portion 8. . For the same reason, when viewed in plan, the loop portion 8 has a dimension in the width direction of the napkin 1 of 1 to 10 mm, particularly 2 to 7 mm, and a dimension in the longitudinal direction of the napkin 1 of 2 to 20 mm, particularly 3 to 10 mm. It is preferable that
[0023]
In the present embodiment, the skin-facing surface of the topsheet 2 is composed of the filament layer 5 composed of a large number of tows. However, in place of the filament layer 5, another fiber layer capable of liquid permeation can be used. . Examples of such a fiber layer include a spunbond nonwoven fabric which is a continuous fiber nonwoven fabric, a card web which is an aggregate of short fibers, a nonwoven fabric in which fibers are fused by heat, a hydroentanglement method, a needle punch method, a melt blown method, and the like. Nonwoven fabrics, knits, woven fabrics and the like obtained in the above. Above all, it is preferable to use a large number of tows or a nonwoven fabric obtained by heat-sealing a card web by an air-through method as a fiber layer as in the present embodiment because a flexible loop portion 8 can be formed. In particular, since the tow is composed of continuous fibers, the capillary force from the top of the loop portion 8 toward the joining portion 7 easily works, and the absorbability of the loop portion 8 is further improved, which is preferable.
[0024]
The constituent fibers of the fiber layer including the filament layer 5 include polyolefin fibers such as polyethylene fibers and polypropylene fibers, polyester fibers such as polyethylene terephthalate fibers, and composite fibers thereof, for example, polyethylene / polypropylene composite fibers and polyethylene / polyester composite fibers. And cellulose fibers such as nylon fibers, rayon fibers and cotton. In particular, thermoplastic fibers such as polyolefin fibers, particularly polyethylene / polypropylene conjugate fibers and polyethylene / polyester conjugate fibers are preferable because of their good adhesion at the joint 7. These thermoplastic fibers such as polyolefin fibers generally have poor absorbability because their surfaces are not hydrophilic. Therefore, it is preferable to make the surface hydrophilic by treating with a surfactant so that the surface becomes hydrophilic.
[0025]
The substrate layer 6 is not particularly limited as long as it is liquid-permeable. For example, a nonwoven fabric, a tow made of continuous filaments, a woven fabric, a knitted fabric, a polyethylene film-perforated film, a perforated net, and the like can be used. Among these, it is particularly preferable to use a nonwoven fabric. As the nonwoven fabric, a nonwoven fabric formed by a heat fusion method, a nonwoven fabric formed by a hydroentanglement method, a nonwoven fabric formed by a needle punch method, a nonwoven fabric formed by a solvent bonding method, a nonwoven fabric formed by a spun bond method, Non-woven fabrics formed by the melt blown method and the like can be given. As a fiber constituting the nonwoven fabric, a fiber made of a thermoplastic polymer material is preferable from the viewpoint that the base layer 6 and the filament layer 5 can be heat-fused and high bonding strength is obtained. Examples of the thermoplastic polymer material include polyolefin such as polyethylene and polypropylene, polyester such as polyethylene terephthalate, and polyamide. In addition, a core-sheath type or side-by-side type composite fiber composed of a combination of these thermoplastic polymer materials can also be used. Further, hydrophilic fibers such as rayon and cotton may be mixed.
[0026]
In particular, in a case where a preferable manufacturing method of a topsheet described later is adopted, it is preferable that the base material layer 6 can be contracted. For example, a fiber or nonwoven fabric exhibiting an elastomeric behavior such as polyurethane, an apertured film, a net, a nonwoven fabric contracted by application of heat, an apertured film, a net, and the like are used.
[0027]
Next, a preferred method for manufacturing the topsheet in the napkin 1 of the present embodiment will be described with reference to FIGS. First, as shown in FIG. 6, the filament layer 5 is laminated on one surface of the base material layer 6 continuously conveyed in one direction. The base material layer 6 may be manufactured in a separate step in advance, or may be manufactured in-line as one step in the manufacturing process of the topsheet 2. The base layer 5 is heat-shrinkable. The obtained laminate is inserted between a convex roll 81 having a large number of convex portions 82 for forming a joint portion and a receiving roll (anvil roll) 84 arranged opposite to the convex roll 81 on the peripheral surface, By applying pressure and heating between the convex portion 82 and the peripheral surface of the receiving roll 84, the base material layer 6 and the filament layer 5 are partially thermally fused to form a large number of joints 7. In this case, at least the convex portion 82 of the convex roll 81 is heated.
[0028]
FIG. 7 is an enlarged view of the convex roll 81 and the convex portion 82 in FIG. The convex portion 82 is a horizontally long rectangular parallelepiped and has a shape obtained by diagonally cutting a ridge portion including one of the two long sides on the upper surface of the rectangular parallelepiped. As a result, the projection 82 has an upper surface 82a and a slope 82b extending from the upper surface. The slope 82 b extends along the width direction of the convex roll 81 and is located on the front side in the rotation direction of the convex roll 81. When the base layer 6 and the filament layer 5 are joined using the convex roll 81 having such a convex portion 82, first, as shown in FIG. 6, the pressure between the slope 82 b of the convex portion 82 and the receiving roll 84 is increased. Then, the base layer 6 and the filament layer 5 are weakly bonded to each other to form a weak bonding area 7b, and subsequently, the base layer 6 and the filament layer 5 are strongly bonded by the pressure between the upper surface 82a and the receiving roll 84. Thus, a strong junction region 7a is formed. As a result, the joint 7 is composed of these two joint regions. These two joining regions are formed so as to be arranged along the shrinking direction of the base material layer 6.
[0029]
After the formation of the joint 7, the laminate is passed through a hot blast stove 83 to apply heat. Thereby, the base material layer 6 is thermally contracted. However, the filament layer 5 does not shrink. The heat shrinkage of the base material layer 6 occurs preferentially between the joints 7 rather than the joints 7. As a result, the portion of the filament layer 5 located between the adjacent bonding portions 7 protrudes to the opposite side to the base material layer 6 to form the loop portion 8. The contraction of the base material layer 6 needs to occur at least in the same direction as the arrangement direction of the filament layers 5 (that is, in the uniaxial direction). In addition, the base material layer 5 may also contract in a direction perpendicular to the direction in which the filament layers 5 are arranged. That is, it may contract in two axial directions.
[0030]
FIG. 8 schematically shows a process of forming the loop portion 8 due to shrinkage of the base material layer 6. Note that the substrate layer 6 is omitted in FIG. Shrinkage hardly occurs in the strong bonding region 7a of the bonding portion 7 even when heat is applied. Therefore, at the boundary between the strong bonding region 7a and the filament layer 5, the filament layer 5 is strongly raised upward. On the other hand, the weak joint 7b slightly contracts due to the application of heat. As a result, the protrusion of the filament layer 5 is weakened at the boundary between the weak junction region 7b and the filament layer 5. In other words, it rises gently. As a result, the loop portion 8 formed by the protrusion of the filament layer 5 is inclined without being upright. As described above, according to the present manufacturing method, the bonding portion 7 includes the strong bonding region 7a and the weak bonding region 7b, and the strong bonding region 7a and the weak bonding region 7b are arranged along the inclination direction of the loop portion 8. In addition, the weak bonding region 7b is located on the front side of the strong bonding region 7a with respect to the tilt direction. The loop portion 8 formed by the present manufacturing method has the lowest fiber density at the top, and the fiber density gradually increases toward the joint.
[0031]
The method of manufacturing the topsheet 2 in the napkin 1 of the present embodiment is not limited to the above-described method, and the following methods (1) to (3) can be adopted. According to these methods, it is not necessary to use a shrinkable material as the base material layer 6.
[0032]
Method (1)
The filament layer 5 is previously processed into a slanted loop shape by a predetermined means, and then is bonded to the base material layer 6.
Method (2)
The filament layer 5 is previously processed into an upright loop shape by a predetermined means, and then the loop is inclined by the predetermined means when the filament layer 5 is joined to the base material layer 6.
Method (3)
An elastic member such as thread rubber is joined to the base layer 6 in an extended state, and after the joining, the filament layer 5 is joined to the base layer 6 while maintaining the extended state, and then the extended state is released. Then, the filament layer 5 located between the joining portions is raised to form a loop portion.
[0033]
Next, a second embodiment of the present invention will be described with reference to FIGS. In these embodiments, only the points different from the first embodiment will be described, and as for the points which are not particularly described, the detailed description regarding the first embodiment will be appropriately applied. 9 and 10, the same members as those in FIGS. 1 to 8 are denoted by the same reference numerals.
[0034]
In the embodiment shown in FIG. 9, the inclined orientation directions of the loop portions 8 in the rear region R, the front region F, the central side regions S, S, and the central region C of the napkin 1 are different. Specifically, a group of loop portions 8 located in the rear region R of the napkin 1 are inclined and oriented toward the center of the napkin 1. A group of loop portions 8 located in the front region F of the napkin 1 is also inclined and oriented toward the center of the napkin 1. Therefore, the inclining directions of the loop portion 8 located in the rear region R and the loop portion 8 located in the front region F are opposite to each other so as to face each other. Further, a group of loop portions 8 respectively located in the central side regions S, S of the napkin 1 are also inclined and oriented toward the central portion of the napkin 1. Accordingly, the inclining directions of the loop portions 8 located in the respective central side regions S, S are opposite to each other so as to face each other. On the other hand, a group of loop portions 8 located in the central region C of the napkin 1 are not inclined but stand upright. In the napkin 1 provided with the top sheet having the loop portion 8 in such an inclined state, the liquid flowing along the body surface can be transferred by the loop portion 8 regardless of the posture of the wearer. The flow is blocked, absorbed through the loop 8 and smoothly guided to the absorber.
[0035]
In order to manufacture the topsheet in the napkin 1 of the present embodiment, it is preferable to use the convex roll 81 ′ shown in FIG. FIG. 10 shows a state in which the peripheral surface of the convex roll 81 ′ is developed into a plane, and the direction indicated by an arrow A in the figure is the roll rotation direction. The roll peripheral surface is divided into a front region corresponding portion 81F ', a rear region corresponding portion 81R', a central side region corresponding portion 81S ', and a central region corresponding portion 81C'.
[0036]
Each corresponding part has a large number of convex parts. Of the convex portions of each corresponding portion, the convex portions 82A 'provided in the front region corresponding portion 81F', the rear region corresponding portion 81R ', and the central side region corresponding portion 81S' are the surface of the first embodiment. It has the same shape as the convex portion 82 provided on the convex roll 81 used for manufacturing a sheet, and has an upper surface 82a 'and an inclined surface 82b' as shown in FIG. On the other hand, the convex portion 82B 'provided in the central region corresponding portion 81C' is a horizontally long rectangular parallelepiped, and has an upper surface 82a 'but has no slope.
[0037]
In the convex portion 82A 'provided in the rear region corresponding portion 81R', the slope 82b 'extends along the width direction of the convex roll 81' and is located on the front side in the rotation direction of the convex roll 81 '. . In the convex portion 82A 'provided in the front region corresponding portion 81F', the slope 82b 'extends along the width direction of the convex roll 81' and is located on the rear side in the rotation direction of the convex roll 81 '. I have. In the convex portion 82A 'provided in the central side region corresponding portion 81S', the slope 82b 'extends along the rotation direction of the convex roll 81' and is positioned so as to face the central region corresponding portion 81C '. are doing. In addition, the convex portion 82B 'provided in the central region corresponding portion 81C' extends along the width direction of the convex roll 81 '.
[0038]
When the topsheet is manufactured according to the manufacturing method of the topsheet described in regard to the first embodiment using the convex roll 81 ′ shown in FIG. 10, the rear region R, the front region F, and the center of the napkin 1 shown in FIG. The joints formed in the side regions S, S are composed of a strong joint region and a weak joint region, and the strong joint region and the weak joint region are arranged along the inclination direction of the loop portion and the inclination direction. In contrast, the weak bonding region is located on the front side of the strong bonding region. On the other hand, in the central region C, the bonding portion is formed with a single bonding strength, and the strong bonding region and the weak bonding region are not formed. In the present embodiment, the base material layer needs to shrink in two axial directions.
[0039]
The present invention is not limited to the above embodiment. For example, as the aspect of the inclined orientation of the loop portion, in addition to the first and second embodiments, the aspect shown in FIG. In the napkin 1 illustrated in FIG. 11, the inclined orientation directions of the loop portions 8 in the rear region R, the front region F, and the center region C of the napkin 1 are different. Specifically, a group of loop portions 8 located in the rear region R of the napkin 1 are inclined and oriented toward the center of the napkin 1. A group of loop portions 8 located in the front region F of the napkin 1 is also inclined and oriented toward the center of the napkin 1. On the other hand, a group of loop portions 8 located in the central region C of the napkin 1 are not inclined but stand upright. In the napkin 1 including the top sheet having the loop portion 8 in such an inclined state, even when the wearer is in any posture, the liquid flowing along the body surface is transmitted by the loop portion 8. The flow is blocked, absorbed through the loop 8 and smoothly guided to the absorber.
[0040]
Further, in the napkin of each of the above-described embodiments, an opened liquid guide hole may be formed in the joint portion 7 so as to further promote liquid permeation. It is preferable that the cross-sectional area of the horizontal cross section of the liquid guide hole decreases from the opening on the filament layer side toward the opening on the base material layer side, from the viewpoint of preventing liquid return.
[0041]
Further, the absorbent article of the present invention is not limited to sanitary napkins, but can be similarly applied to other absorbent articles such as panty liners, incontinence pads, disposable diapers and the like.
[0042]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the absorbent article of this invention, the liquid leakage prevention property, especially the liquid which flows along a body surface can be reliably guided to an absorber, and liquid leakage can be prevented. Further, the absorbent article of the present invention has a good touch, a high cushioning feeling, and a comfortable wearing feeling.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a sanitary napkin as one embodiment of an absorbent article according to the present invention.
FIG. 2 is a sectional view taken along line II-II in FIG.
FIG. 3 is a partially enlarged plan view of a part of the topsheet shown in FIG. 2 as viewed from a filament layer side.
FIG. 4 is a schematic view showing a liquid absorption mechanism of the napkin shown in FIG.
FIG. 5 is an enlarged schematic view showing a shape of a loop portion.
FIG. 6 is a schematic view showing a method of manufacturing the top sheet of the napkin shown in FIG.
FIG. 7 is an enlarged schematic view showing a main part of a convex roll.
FIG. 8 is a schematic view showing a process of forming a loop portion.
FIG. 9 is a plan view schematically illustrating a second embodiment of the absorbent article according to the present invention.
FIG. 10 is a schematic diagram showing a state in which a peripheral surface of a convex roll used for manufacturing the absorbent article shown in FIG. 9 is developed on a plane.
FIG. 11 is a plan view schematically showing another embodiment of the absorbent article of the present invention (corresponding to FIG. 9).
[Explanation of symbols]
1 sanitary napkins (absorbent articles)
2 Surface sheet
3 Back sheet
4 absorber
5 Filament layer
6 Base material layer
7 Joint
7a Strong junction area
7b Weak joint area
8 Loop section

Claims (9)

It has a fiber layer directed toward the skin side of the wearer and a base material layer disposed on the absorber side, and the fiber layer and the base material layer are partially joined to form a large number of joints. The fiber layer is an absorbent article having a surface sheet forming a large number of convex loop portions toward the wearer's skin side in a portion other than the joint portion,
An absorbent article in which a group of the loop portions located in a predetermined region of the topsheet is inclined and oriented in a predetermined direction. The absorbent article according to claim 1, wherein a group of the loops located in a rear region of the absorbent article are inclined and oriented toward a central part of the absorbent article. 3. The absorbent article according to claim 1, wherein a group of the loops located in a front region of the absorbent article are inclined and oriented toward a central part of the absorbent article. 4. The absorbent article according to any one of claims 1 to 3, wherein a group of the loops located in a side region of the absorbent article is inclined and oriented toward a central part of the absorbent article. The bonding portion located in the predetermined region includes a strong bonding region and a weak bonding region, and the strong bonding region and the weak bonding region are arranged along a tilt direction of the loop portion and are arranged with respect to the tilt direction. The weak bonding region is located on the front side of the strong bonding region, and after joining the filament layer and the base material layer at the bonding portion, the loop portion is formed by shrinking the base material layer. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is inclined. When considering a baseline and a perpendicular bisector of the base line drawn between the joining portions adjacent to each other along the inclination direction of the loop portion, with respect to the inclination direction, after the vertical bisector, The area of the region R1 surrounded by the curve drawn by the loop portion located on the side, the vertical bisector, and the base line is defined as A1, and the loop located forward of the vertical bisector. A2 / A1 is 1.5 to 15, where A2 is the area of the region R2 surrounded by the curve drawn by the portion, the vertical bisector, and the base line. The absorbent article according to item 1. The absorbent article according to any one of claims 1 to 6, wherein a liquid guide hole is formed in the joint. It has a fiber layer directed toward the skin side of the wearer and a base material layer disposed on the absorber side, and the fiber layer and the base material layer are partially joined to form a large number of joints. The fiber layer is a surface sheet for an absorbent article having a large number of loop portions that are convex toward the skin side of the wearer in a portion other than the joint portion,
A topsheet for an absorbent article, wherein a group of the loop portions located in a predetermined region of the topsheet is inclined and oriented in a predetermined direction. It is a manufacturing method of the surface sheet of Claim 8, Comprising:
The fiber layer and the substrate layer having heat shrinkage are overlapped, a joining step of partially joining the two at a large number of the joints, and shrinking the substrate layer by applying heat after joining, A loop portion forming step of forming a loop portion by raising the fiber layer located between the adjacent bonding portions to the opposite side to the base material layer,
The bonding portion formed in the bonding step includes a strong bonding region and a weak bonding region, such that the strong bonding region and the weak bonding region are arranged along a shrinking direction of the base material layer. A method for manufacturing a topsheet that forms each of these joining regions.

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