JP5596516B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article (female absorbent article) such as a sanitary napkin, an incontinence pad, and a panty liner that has a wing portion and is fixed to underwear such as shorts.

Some absorbent articles used by attaching to underwear such as sanitary napkins are provided with a wing part (such as a blade-like part or a flap part) protruding outward from the side edge of the article. An adhesive portion is provided. When using a napkin or the like, the wing portion is bent along the side edge of the underwear and fixed to the underwear via the adhesive portion.
Usually, as the constituent material of the wing portion, a material having smoothness is used for good formation of the adhesive portion, and for example, a film material or a sheet obtained by laminating a film material and another nonwoven fabric is used. In addition, Patent Document 1 discloses a stretchable nonwoven fabric that can form an adhesive portion by partial film formation by heat fusion. However, since the wing portion is the base of the user's foot after wearing, the material of the skin side surface different from the surface on which the adhesive portion is formed is not highly smooth like a film material, and a material with a better touch is desired. It is. In recent years, as the number of women who have a job increases, it is indispensable to reduce various discomforts that occur during menstruation, and the needs for these are increasing.

On the other hand, it is conceivable to reduce the discomfort in the crotch portion by using a bulky and soft nonwoven fabric as a constituent member of the wing portion. However, the non-woven fabric has a structure with a lot of space formed by intertwining the fibers and a low fiber density, so that the adhesive for fixing to the underwear penetrates and sticks to the opposite side of the non-woven fabric application surface. The surface strength of the nonwoven fabric was weak, and the adhesive application part could peel off. For this reason, it is difficult to form a stable adhesive portion with the non-woven fabric as it is.
In addition, there are various types of absorbent articles such as sanitary napkins that are provided with a design or the like for the purpose of relieving the depressed feeling of the user at the time of menstruation (see, for example, Patent Document 2). If such a pattern or the like is in the wing portion made of a nonwoven fabric, it can be easily touched by the hand when using the napkin, so that it can be expected to have a psychological effect to relieve the user's discomfort. However, even if the pattern is applied by any printing method, the nonwoven fabric has a sparse structure with many spaces and it is difficult to transfer the ink layer as a pattern onto the surface to form the pattern. It was.

JP 2004-154351 A JP 2005-523139 A

  In view of the above problems, the present invention is a pressure-sensitive adhesive for fixing a pattern or the like by applying ink to an undergarment or the like without damaging the characteristics even if a non-woven fabric having a good texture or touch is used for a wing portion corresponding to the skin. It is an object of the present invention to provide an absorbent article that can form a part and can prevent stickiness of the surface of the wing part due to an adhesive.

  The present invention provides an absorbent main body comprising a top sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between the two sheets. The absorbent article has a pair of wings protruding outward in the width direction from the side edges in the longitudinal direction in the excretion part-facing region of the absorbent main body, wherein the wing parts are made of nonwoven fabric, and the nonwoven fabric is configured Nonwoven fabric that has an ink collecting portion near the intersection of fibers, and has an adhesive portion for fixing to the underwear on the non-skin contact surface side of the nonwoven fabric, and faces the region where the adhesive portion exists The above-mentioned problems are solved by providing an absorbent article in which the ink collecting portion is formed.

  The absorbent article of the present invention has a pressure-sensitive adhesive part for fixing a pattern or the like by applying ink to the underwear or the like without damaging the characteristics even if a non-woven fabric having a good texture or touch is adopted for the wing part corresponding to the skin. The pressure-sensitive adhesive that can be formed and also serves as an adhesive portion has an excellent effect of suppressing the stickiness of the surface of the wing portion.

It is the partially cutaway perspective view shown from the skin contact surface direction in the state where the sanitary napkin as one embodiment of the present invention was extended. FIG. 2A is an enlarged cross-sectional view taken along the line II-II shown in FIG. 1, and FIGS. 2B and 2C are schematic views showing an example of the vicinity of the intersection of the fibers where the ink collecting portion is formed. is there. It is the cross-sectional enlarged view which expanded and showed typically the cross section of a part of wing part as a modification of the sanitary napkin of this embodiment. It is the cross-sectional enlarged view which expanded and showed the cross section of a part of wing part as another modification of the sanitary napkin of this embodiment.

  FIG. 1 is a partially cutaway perspective view showing a sanitary napkin as an embodiment of the present invention from the skin contact surface direction. Fig.2 (a) is sectional drawing of the II-II line cross section shown in FIG. 1, and expanded and showed typically the cross-section inside a nonwoven fabric with the in-circle figure. FIGS. 2B and 2C are schematic views showing an example of the ink collecting portion 24 of the coated ink formed at or near the intersection of the fibers (in the present invention, simply referred to as the intersection).

  The sanitary napkin 100 of the present embodiment includes a top sheet 1 disposed on the skin contact surface side, a back sheet 2 disposed on the non-skin contact surface side, and an absorbent body 3 interposed between both sheets. The absorbent main body 10 and a pair of wings 20 projecting outward in the width direction (X direction) from both side ends in the longitudinal direction in the excretory part facing region of the absorbent main body 10. In the absorbent main body 10, the portions of the top sheet 1 and the back sheet 2 that extend outward from the peripheral edge of the absorbent body 3 are pressure-bonded by heat sealing or the like to form the outer peripheral seal portion 4. The shape of the absorbent main body 10 has a longitudinal direction (Y direction) arranged from the lower abdomen side to the buttocks side through the wearer's crotch portion when worn and a width direction (X direction) orthogonal thereto. It is a vertically long shape. In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin surface side or the skin contact surface side or the surface side, and the side in contact with the underwear is the non-skin surface side or the non-skin contact surface side or It is called the back side. The normal direction of the front or back surface of the sanitary napkin is called the thickness direction, and the amount is called thickness. Furthermore, a direction having a relatively long length in plan view of the sanitary napkin is referred to as a longitudinal direction, and a direction orthogonal to the longitudinal direction is referred to as a width direction. The longitudinal direction typically coincides with the front-rear direction of the human body when worn.

  On the skin contact surface side of the sanitary napkin 100 in the present embodiment, a leak-proof groove 5 squeezed from the skin contact surface side of the topsheet 1 to the absorber 3 is applied (see FIG. 1). The leak-proof groove 5 includes an annular leak-proof groove 5a and a pair of arcuate leak-proof grooves 5b and 5b on the outer side in the width direction. The annular leak-proof groove 5a is an all-around groove extending from the excretory part-facing region to the front and rear ends, and has a shape in which left and right portions are respectively connected in the longitudinal direction to three curves that curve outward in the width direction. The arcuate leak-proof groove 5b has a convex shape outward in the width direction, and has a shape similar to a portion corresponding to the excretory part facing region of the annular leak-proof groove 5a. In the excretory part opposing area | region, it has double-arranged by the annular leak-proof groove 5a and the arcuate leak-proof groove 5b, respectively on both the left and right sides of the absorber 3. As a result, side leakage can be effectively suppressed. In addition, an excretion part opposing area | region means the part which a napkin receives excretion of menstrual blood or a thing directly, and its vicinity. The excretory part opposing region in the present embodiment is a central part in the longitudinal direction of the napkin 100 and is a region sandwiched between the pair of wing parts 20. The wing part 20 in the present invention is fixed by being wound around the crotch part of the wearer's shorts, and a fixing material (adhesion part to be described later) is applied by applying a non-slip hot melt adhesive to the non-skin contact surface of the wing. 22). The wing portion 20 is formed in a region facing the excretion portion (vaginal opening) of the absorbent main body. The region may be the central portion in the longitudinal direction of the napkin (daytime napkin) or the front (nighttime napkin). In the embodiment of the present invention, the wing is formed using a member different from the main body. However, the back sheet, the top sheet, or the side sheet can be extended into a wing shape to form a wing. If the wing part 20 is made of a separate material, the waste part can be reduced by cutting and taking out a pair of left and right wing shapes from the nonwoven material.

  The wing portion 20 is made of a non-woven fabric 21 having a high water repellency and a low fiber density, and is an independent member from the absorbent main body 10. Thereby, even if the wing part 20 touches skin, it becomes a soft touch without feeling the stickiness like a film material or the stickiness feeling derived from smoothness. One end in the width direction 20i of the wing portion 20 is applied to the side edge of the absorber 3, and is sandwiched between the top sheet 1 and the back sheet 2 at the outer side in the width direction, and is crimped and fixed by the corrugated joint 4a. ing. Since the wing part 20 is made of the water-repellent nonwoven fabric 21 and the corrugated joint part 4a is disposed, the side leakage of menstrual blood can be effectively suppressed. Further, the wing portion 20 is laminated from the side edge of the absorbent body 3 to the corrugated joint portion 4a, so that it can also serve as a stiffening prevention material for the crotch portion. In addition, in the nonwoven fabric 21 used as the wing part 20 and this member, the surface facing the surface sheet side in the stretched state before turning back is described as a skin surface side surface 20a, and the surface facing the back sheet side is described as a non-skin surface side surface 20b. (See FIG. 2). The two surfaces are folded when the napkin is worn, and the direction is reversed. The non-skin-side surface 20b faces the outer side of the clothing and becomes the skin side, and the skin-side surface 20a faces the outer side of the clothing and the non-skin surface. Become the side.

The non-woven fabric 21 that forms the wing portion 20 of the present embodiment is provided with a printing region 23 (see FIG. 1). The printing region 23 is formed by applying a hydrophobic or oil-based printing ink, and the applied ink is also disposed at a predetermined depth inside the nonwoven fabric 21 from the skin surface 20a (see FIG. 2). The ink inside the non-woven fabric 21 adheres to and is fixed to the fibers to form a small lump of ink assembly 24. Unlike the ink layer formed on the surface of the sheet material as in the conventional printing, the ink gathering portions 24 are scattered in the thickness direction and the planar direction using the intersections where the fibers in the nonwoven fabric are fused together. Three-dimensionally arranged. The ink collecting portion 24 is made of dried ink applied in the vicinity of the intersection, and the individual size varies depending on the viscosity of the ink, but is fine.
The scattered ink collecting portions 24 are fine points constituting the design. The average size (equivalent circle diameter of the area in plan view) of the ink collecting portion 24 is 50 to 50 in order to achieve both the formation of a fine and impressive design and the favorable formation of the adhesive portion 22 described later. 500 μm is preferable, and 100 to 300 μm is more preferable. The size of the ink collecting portion 24 is a size between fibers such as a fiber intersection where the ink collecting portion 24 is disposed, and is an enlarged image (100 to 200 times) of an electron microscope (using JEOL JCS-5100). ) Can be measured by an image analysis processing method for obtaining the equivalent circle diameter after specifying (binarizing) the ink portion. The range in which the ink collecting portion 24 is disposed with respect to the thickness of the nonwoven fabric 21 is preferably up to 60% of the entire thickness from the nonwoven fabric 21 skin surface side 20a, and more preferably up to 45%. . In order to achieve such an arrangement of the ink collecting portions 24, in contact printing described later, it is preferable to compress 30-60% with respect to the original thickness of the nonwoven fabric 21 during ink coating, and 40-50% compression. More preferably. Similarly, the amount of ink applied is preferably 0.5 to 10 g / ^{m 2,} more preferably 1 to 5 g / ^{m 2.}

  The printing region 23 including the ink collecting portion 24 can be viewed as a single pattern in a plan view from the skin side surface 20a side by the ink coating pattern inside the nonwoven fabric. By forming the ink collecting portion 24 in this way, it is possible to apply a pattern even to a bulky and soft nonwoven fabric having many gaps between fibers. Due to the three-dimensional dotted arrangement of the ink collecting unit 24, the pattern in plan view becomes a three-dimensional pattern having a depth as compared with a pattern by conventional printing. In addition, since the ink layer covering the surface of the nonwoven fabric is not formed, the ink is further fixed at a fiber intersection or the like where the degree of freedom of the fiber is small, and the degree of freedom of the fiber is low because it is difficult to be fixed at a portion where the fiber is highly mobile. The soft texture and texture of the nonwoven fabric 21 are not easily damaged. By forming the ink collecting portion 24, direct contact with the ink is reduced, so that the ink is not easily dropped.

  In the present invention, the fiber portion to which the ink collecting portion 24 adheres is a minute area consisting of a plurality of intersections, for example, in the vicinity of the intersection of the constituent fibers of the nonwoven fabric 21, for example, in the fusion intersection of the fibers or in the vicinity thereof (see FIG. 2B). This is a gap (see FIG. 2C). The ink collecting portion 24 is a solidified ink reservoir formed so as to fill the vicinity of the intersection of the fibers. Usually, the vicinity of the intersection of these fibers is not limited to ink but is a portion where liquid tends to accumulate. In an absorbent article such as a napkin, the vicinity of the intersection of the fibers is also a portion where excretory liquid or adhesive may accumulate. In general, such a small liquid reservoir can be a base point for diffusing the liquid into the fiber even in a water-repellent nonwoven fabric that is difficult to transmit the liquid. In the present invention, this portion is pre-filled with an ink collecting portion 24 made of hydrophobic or oil-based ink, so that the non-woven fabric becomes a starting point of bleeding which is one of the factors of moisture in the water-repellent non-woven fabric. Internal liquid residue (liquid retention) can be made difficult to occur, and the liquid leakage prevention function of the wing portion 20 made of the nonwoven fabric 21 can be further enhanced.

  And in this invention, the adhesion part 22 is formed in the non-skin-surface side surface 20b of the nonwoven fabric 21 within the range of the printing area | region 23 where this ink gathering part 24 was distribute | arranged (refer Fig.2 (a)). The adhesive part 22 is formed by applying a hot melt adhesive or the like as a means for fixing the wing part 20 to the underwear. That is, the ink collecting portion 24 is formed in the nonwoven fabric 21 facing the region where the adhesive portion 22 exists. In the nonwoven fabric 21, when a pressure-sensitive adhesive serving as the adhesive portion 22 is applied to the non-skin surface side surface 20 b, the adhesive portion 22 is impregnated to a predetermined thickness based on the intersection between the fibers by the capillary force between the fibers of the nonwoven fabric. Is formed. However, when reaching a predetermined thickness inside the nonwoven fabric 21, the base point of liquid diffusion is crushed by the arrangement of the ink collecting portion 24, so that further impregnation of the adhesive is suppressed. That is, the presence of the ink collecting portion 24 prevents the pressure-sensitive adhesive from penetrating into the skin surface 20a and makes the skin surface 20a less likely to stick. The presence of the ink collecting portion 24 can prevent the skin surface surface 20a from penetrating not only during product manufacture but also after product shipment, regardless of the temperature conditions. In addition, due to the presence of the ink collecting portion, the adhesive portion 22 can be appropriately impregnated between the fibers of the non-woven fabric and firmly fixed, making it difficult to peel off. As a result, good operability and wearability can be obtained when the napkin 100 is fixed to the underwear. Further, since the ink and the adhesive do not cover the skin surface side surface 20a of the nonwoven fabric 21, the good texture and feel of the nonwoven fabric 21 are not impaired.

In the present embodiment, in order to more effectively suppress stickiness due to penetration of the adhesive to the skin surface side surface 20a, the ink collecting portion 24 is arranged biased to the skin surface surface 20a in the thickness direction of the nonwoven fabric 21. ing. This means that more ink collecting portions 24 are arranged in the portion (h ₁ ) on the skin surface side surface 20a side than the center line t of the thickness of the nonwoven fabric 21. Thereby, the strong adhesive part 22 which an adhesive is impregnated to the deep position of the nonwoven fabric 21, and is hard to peel off is formed, and the omission of the adhesive to the skin surface side surface 20a can be prevented effectively.

  In the present embodiment, as a method of arranging the ink collecting portions 24 within the nonwoven fabric 21 in a scattered manner, and in particular, being biased and scattered on one surface, it is preferable to perform contact printing from the surface of the nonwoven fabric 21 on the side to be biased. . Here, a description will be given of a case where the ink collecting portion 24 is scattered and scattered on the skin surface side surface 20a of the nonwoven fabric 21. Contact printing is printing in which the nonwoven fabric 21 is compressed in the thickness direction to create a temporary high-density state of fibers, and ink is applied under the circumstances. In this printing, in addition to the gaps between the fibers created by fusing the fiber intersections, fibers at different positions also approach by compression in the thickness direction, and many gaps between small fibers are created. When ink is applied to a predetermined range on the skin-side surface 20a of the nonwoven fabric 21, the ink penetrates in the thickness direction and adheres on the fibers and fills a relatively small portion of the fiber gap. Subsequent release of the compressed state causes the nonwoven fabric to return to its original fiber structure, but the gap between the temporarily created fibers disappears, and the amount of attached ink that cannot be fixed to the fiber surface moves to the fiber intersection. Then, a portion having a high ink density is created, and this portion is solidified. In this way, the above-described ink collecting portion 24 is formed in a three-dimensional manner from the vicinity of the skin surface side surface 20a to a position separated in the thickness direction. Basically, the ink is dispersed in the thickness direction at the applied position to form the ink collecting portion 24. Therefore, when the nonwoven fabric is viewed from the outer surface, the ink collecting portions 24 hardly overlap each other along the thickness direction of the nonwoven fabric. When it becomes, the visibility becomes favorable. Further, there is an advantage that the comfortable texture of the nonwoven fabric can be easily maintained despite the fact that the ink gathering portion 24 is formed and fixed as described above and the bonding force between the fibers in the nonwoven fabric is enhanced. In this printing method, unlike the conventional printing method in which an ink layer is formed in a predetermined area on the surface of the nonwoven fabric, the ink collecting portion 24 constitutes small dots of a design, so a fine and clear color arrangement and design arrangement Is possible. This can be combined with the above-described three-dimensional arrangement of the ink collecting section 24 to render various designs and to produce a good psychological effect on the user visually. The color scheme and printing density can be appropriately adjusted depending on the degree of temporary compression of the nonwoven fabric 21 and the amount of ink. By these two adjustments, the arrangement and number of the ink collecting portions 24 to be formed can be adjusted.

  When forming the ink collecting portion 24 in the present invention, the ink is held (moved) by the capillary phenomenon due to the high density state formed by temporary compression, and the high density state is released by releasing the compression, so that the ink partially It is considered that the ink gathering portion 24 is formed at the position described above due to the movement, and when the same ink is used, the density of printing can be controlled by the thickness position.

  The print area 23 may be composed of a single color ink, or may be composed of multicolor ink. Regardless of whether the ink is a single color or multiple colors, when attention is paid to one ink, the ink may be printed in light and shade. In order to make the movement of the ink by compression and release of the nonwoven fabric 21 described above suitable, the printing ink to be used is, for example, a water-based or oil-based medium-based ink, a curable ink such as an ultraviolet curable ink, or the like. Can be used. In addition, a clear ink that does not contain a colorant is applied to the nonwoven fabric before applying the colored ink. After filling the gaps between the fibers and narrowing the gaps between the fibers, the colored ink is applied to further improve the fixability of the ink. It can also be made. Further, in screen printing in which ink is spotted in dots, a plurality of types of inks can be applied by controlling the size and position of the dots, so that multi-printing can be supported. Further, a surfactant or oil agent that expresses different properties from the ink may be added to the fiber surface to control the mobility of the ink (for example, a hydrophilic active agent is added to the fiber surface for oil-based ink). And the mobility of the ink is controlled by the amount of the surfactant. As the above-described contact printing method using various inks, for example, letterpress printing, planographic printing, stencil printing, and the like can be employed.

  In this embodiment, in order to be the nonwoven fabric 21 which can perform the above-mentioned contact printing, the adhesive part 22 is well formed, and has a good texture and touch, it is preferable that the bulk is high and the fiber density is moderately sparse. Such a nonwoven fabric 21 can be obtained, for example, by appropriately selecting a nonwoven fabric manufacturing method or a constituent fiber of the nonwoven fabric. Regarding the method for producing a nonwoven fabric, it is preferable to employ a method capable of producing a nonwoven fabric having a low basis weight and a low density and good in the initial compression state. Examples of such a manufacturing method include an air-through method and an airlaid method, but are not limited to these methods. In the air-through method, staple fiber is used as a raw material, which is supplied to a card machine to form a web by entanglement of fibers, and hot air is blown onto the web in a penetrating manner to thermally bond the intersections of the constituent fibers. In the airlaid method, short fibers are conveyed in an air stream and deposited on a collecting conveyor to form an airlaid web, and the constituent fibers of the web are bonded by heat or an adhesive. The length of the fiber used in airlaid is shorter than the air-through method, and the structure of the nonwoven fabric tends to be rigid. Therefore, the nonwoven fabric is softened by compression treatment with a roll of metal, rubber, cotton, etc. as a post-treatment after the same hot air production method. Apply. Moreover, in order to suppress the nonwoven fabric strength fall by the above-mentioned post-processing, it is preferable to use a latex binder for the fusion | melting in a fiber intersection.

As a constituent fiber of the nonwoven fabric 21 according to the present embodiment, the touch is good, suitable for the formation of the ink collecting portion by the above-described contact printing, and from the viewpoint of preventing the bleeding of the adhesive, the basis weight of the nonwoven fabric and the nonwoven fabric density are low, In addition, it is preferable to use a non-woven fabric that is easily crushed and temporarily restored during printing. The basis weight is preferably 15 to 50 g / cm ^2, more preferably 18~30g / cm ^2. The density is preferably 0.02~0.1g / cm ^3, more preferably 0.03~0.08g / cm ^3. Moreover, 0.5-1 are preferable and RC value / WC value which shows the ease of return of the thickness from the crushing of the temporary compression at the time of printing of a nonwoven fabric, and 0.7-0.9 are still more preferable. In addition, RC value and WC value in this embodiment make LC value which is the linearity of the compression load-compression strain curve measured according to KES (Kawabata Evaluation System) as a scale. In KES, the WC value is the compression work WC, and the RC value is the compression resilience value (the work at the time of compression release).

The LC value, WC value, and RC value are measured using a handy compression measurement program of KES-G5 “Handy Compression Tester” (trade name) manufactured by Kato Tech. Specific measurement conditions are as follows. That is, sample: cloth / film, SENS: 2, type of force meter: 1 kg, SPEED RANGE: 0.02 cm / sec, DEF sensitivity: 20, pressurization area: 2 cm ² , measurement load: set to 5.0 At a maximum compression load of 50 gf / cm ² and standard temperature and humidity conditions (23 ° C./50% RH).

  As the constituent fiber of the nonwoven fabric, it is preferable to use, for example, a single or composite heat-fusible fiber composed of various thermoplastic resins. The fiber thickness is preferably 1.5 to 5.5 dtex, more preferably 2 to 4.4 dtex, for the above-mentioned good touch and good formation of the ink collecting part and the adhesive part 22. Moreover, as length of a fiber, 38-72 mm is preferable and 45-65 mm is further more preferable. The heat-fusible fiber includes a first resin component made of a high melting point resin and a second resin component made of a low melting point resin, and the second resin component continues at least part of the fiber surface in the length direction. It is also preferred to use existing composite fibers.

  Specific examples of the constituent fibers of the nonwoven fabric include single resin fibers, polyolefin fibers such as polyethylene and polypropylene, polyester fibers such as polyethylene terephthalate, polyamide fibers such as polyamide 6 and polyamide 66, polylactic acid fibers, and the like. Non-hydrophobic single synthetic fiber. As the multicomponent composite fiber, a polyethylene resin is used as a low melting point component on the sheath side in the core-sheath structure fiber, a polyester resin such as polyethylene dephthalate on the core side, a polyamide resin such as polyamide 6 or polyamide 66, a poly The core-sheath structure fiber using hydrophobic composite synthetic fibers, such as a lactic acid resin, is mentioned.

  The nonwoven fabric may be composed of a single fiber containing one kind of the above-mentioned fibers, or may be a blend of two or more kinds of fibers. It is preferable to use ~ 100% by mass, and the amount of the resin such as polyester resin, polyamide resin or polylactic acid resin as a core component or a single fiber is 20 to 60% by mass in the nonwoven fabric in terms of bulkiness of the nonwoven fabric. Is preferred. Further, a plurality of fiber layers including one or more of the above-described fibers may be stacked and integrated. Furthermore, the non-woven fabric may contain natural fibers such as pulp and rayon as fibers other than the heat-fusible fiber to such an extent as not to inhibit the fusion formation (for example, up to 30% by mass of the non-woven fabric).

The thickness of the nonwoven fabric is preferably 0.5 to 5.0 mm, particularly preferably 0.8 to 4.0 mm, provided that the basis weight and density of the nonwoven fabric are within the ranges described above. This makes it possible to make the nonwoven fabric sufficiently bulky. The thickness of the nonwoven fabric is measured under the condition of a load of 0.5 gf / cm ² using a microscope VHX-1000 manufactured by Keyence Corporation or the KES-G5 “Handy Compression Tester” described above.

Since the nonwoven fabric 21 has a LC structure in the range shown below together with the recoverability indicated by the above-mentioned RC value / WC value since the fiber intersection forms a network structure formed by fused fibers, The deformation from the density state to the high density state is easy, and a stable high density state is formed through the printing process. From the LC value, the ease of collapsing (followability) in temporary compression can be evaluated, and the LC value at which the non-woven fabric is hard to collapse and the high density state is stable is 0.4 or more. It is 8 or less. Further, the LC value being within this value is a comprehensive value in printing, such as showing that the network structure of the nonwoven fabric is uniformly created. On the other hand, similarly, from the evaluation by KES using KES-G5, the WC value that is the compression work amount and the RC value that is the compression resilience can be obtained at the same time, and the WC of the nonwoven fabric having the printed portion formed by contact printing. When the value is 0.8 to ² gf · cm / cm ² and the RC value is 50 to 80%, partial adaptability in the printing process is excellent. The thickness that does not allow the ink to pass through the nonwoven fabric even by pressurization during printing is that the nonwoven fabric preferably has a WC value of 0.8 gf · cm / cm ² or more, and a high density state is stable. And the WC value of the said nonwoven fabric obtained easily is ² gf * cm / cm <2> or less. The RC value of the nonwoven fabric in which the ink is fixed (by dispersion) is 50% or more, and the RC value of the nonwoven fabric in which the high density state is stable is 80% or less. The WC value is more preferably 1 to 1.5 gfcm / cm ² and the RC value is preferably 55 to 65%.

Next, a sanitary napkin 100 according to this embodiment will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view schematically showing a partial cross-section of the wing portion 30.
The wing portion 30 includes a non-woven fabric 33 including an upper non-woven fabric layer 31 having an ink collecting portion 24 and a lower non-woven fabric layer 32 having no ink collecting portion. Here, the layer on the top sheet side in the stretched state before the wing part 30 is folded back is referred to as the upper layer, and the layer on the back sheet side is referred to as the lower layer. Inside the upper non-woven fabric layer 31, the ink collecting portions 24 are arranged in a three-dimensional manner so as to be biased toward the non-skin surface side surface 31b. The lower layer nonwoven fabric layer 32 is bonded to the non-skin surface side surface 31 b of the upper layer nonwoven fabric layer 31, and the adhesive portion 22 is disposed on the non-skin surface side 32 b of the lower layer nonwoven fabric layer 32. With such a configuration, the pressure-sensitive adhesive layer 22 is firmly impregnated to the thickness of the lower nonwoven fabric layer 32 and is further fixed by the ink collecting portion 24 around the non-skin surface 31b of the upper nonwoven fabric layer 31. Impregnation can be prevented. In other words, since the impregnation of the adhesive is suppressed deeper from the skin surface side surface 31a of the upper layer nonwoven fabric 31, stickiness suppression on the skin surface side surface 31a is more effectively achieved. Furthermore, in the ink gathering portion 24, the bonding between the fibers due to the ink is strengthened, so that this portion is in the vicinity of the lower nonwoven fabric layer 42, so that the strength of the member when peeling the wing portion 30 from the underwear after using the napkin 100 is improved. It is also preferable because it contributes to Further, since the ink collecting portion 24 is not provided on the skin surface side surface 31a side of the upper nonwoven fabric layer 31, a better wearing feeling can be obtained by bringing the original fabric of the nonwoven fabric into contact with the skin. preferable.

  In the present embodiment, in order to prevent peeling of the adhesive portion 22 by impregnation with the adhesive, increase the strength of the wing portion 30, and further improve the touch of the skin surface side surface 21a, the thickness of the upper nonwoven fabric 31 and the lower layer The ratio of the nonwoven fabric 32 to the thickness is preferably 1/4 to 3/4, and more preferably 1/3 to 2/3.

Next, another modification of the wing portion will be shown with reference to FIG. FIG. 4 is an enlarged cross-sectional view schematically showing a partial cross-section of the wing portion 40.
The wing portion 40 is composed of a single layer of non-woven fabric 41, and the ink collecting portions 24 are arranged in a three-dimensional manner in a biased manner toward the non-skin surface side surface 41b. The adhesive portion 22 is disposed on the non-skin surface side surface 41 b of the nonwoven fabric 41. With this configuration, even if there is some ink remaining on the surface of the nonwoven fabric, an ink layer that covers the surface of the sheet material is not formed as in the past, so that the adhesive portion 22 is formed by impregnation with an appropriate adhesive. Can be done. Moreover, in the wing part 40, when the ink gathering part 24 exists in the vicinity of the non-skin surface side surface 41b, the coupling | bonding of the fiber of the nonwoven fabric 41 of the adhesion part 22 periphery is strengthened, when peeling the wing part 40 from underwear etc. It can also provide a reinforcing action against the load applied. Moreover, since the stickiness of the adhesion part 22 can prevent more effectively that it falls to the non-application surface side, it is preferable.

  The surface sheet 1 in the present embodiment is preferably a hydrophilic thermal bond nonwoven fabric from the viewpoint of promptly absorbing excreted bodily fluid and transmitting it to the absorbent body and from the viewpoint of good touch, and particularly preferably an air-through nonwoven fabric. The topsheet 1 is preferably a thermoplastic resin fiber that has been subjected to a hydrophilic treatment, and the fiber is a fiber that has undergone a three-dimensional crimp such as a secondary crimp or a tertiary crimp. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers thereof are prepared, and various hydrophilizing agents are applied at a stage before cutting into a predetermined length to form staples. Hydrophilic agents include various alkyl sulfonates represented by α-olefin sulfonates, acrylates, acrylate / acrylamide copolymers, ester amides, ester amide salts, polyethylene glycol and derivatives thereof, water-soluble Hydrophilic treatment with a hydrophilizing agent known to those skilled in the art, such as a reactive polyester resin, various silicone derivatives, various sugar derivatives, and mixtures thereof, can be used.

As the back sheet 2, a moisture permeable film alone, a non-moisture permeable film alone, a laminate of a film and a nonwoven fabric, or a water-repellent nonwoven fabric (such as SMS or SMMS) can be used. It is most preferable to use a moisture permeable film alone as a leak-proof material from the viewpoint of cost and matching with an anti-displacement adhesive. As the film material in this case, a film obtained by melt-kneading a thermoplastic resin and an inorganic filler that is not compatible with the thermoplastic resin and extruding the film to a predetermined size to make fine holes, or essentially moisture The non-porous film which is highly compatible and can discharge water vapor, such as a permeable membrane. In order to realize a leak-proof layer that sufficiently exhibits the performance of moisture discharge related to the present invention and does not ooze out moisture, the moisture permeability should be in the range of 0.7 to 3.0 g / 100 cm ² hr. Is preferable, and it is still more preferable that it exists in the range of 1.0-2.5. From the standpoint of sufficiently improving the smoothness, it is most preferably from 1.5 to 2.5. Moreover, in order to be able to use without trouble, such as a tear of a film, a film basic weight is 18-70 g / m < ² >, More preferably, it is 25-60 g / m < ² >. Moreover, a preferable inorganic filler compounding quantity is 30-65 mass% as a mass% of the filler with respect to the mass of the whole film, More preferably, it is 40-60 mass%.

  The absorbent body 3 can be arbitrarily used what is used for this type of article, for example, a structure in which a fiber layer is coated with a core wrap sheet, a structure containing a water-absorbing polymer therein, or a thin shape. Various forms such as a sheet can be adopted. The fiber material constituting the fiber layer includes natural fibers such as wood pulp and plant pulp such as softwood and hardwood pulp, regenerated fibers such as cupra and rayon, semi-synthetic fibers such as acetate, polyolefins, polyamides, and polyesters. Synthetic fibers and the like can be mentioned, and one of these can be used alone, or two or more can be used in combination. As the polymer particles, starch-based, cellulose-based or synthetic polymer-based particles can be used.

  In the present invention, the wing portion can be appropriately set as a portion having a shape protruding from the side portion in the width direction of the absorbent main body, and is formed by a sheet material provided separately as in this embodiment. It is not limited to, The part which the surface sheet or another member extended may be sufficient. The shape of the leak-proof groove may also intersect with each other at the front end and the rear end in addition to the endless annular continuous shape as in the present embodiment, and is appropriately determined according to the size and application of the absorbent article. be able to.

  In the present invention, the printing area of the wing portion is not limited to the shape illustrated in the present embodiment, and can be arbitrarily determined depending on the size and application range of the adhesive portion 22, the shape of the pattern, and the range to be drawn. . Moreover, the printing area | region which a wing part has may extend not only to the part protruded from the absorptive main body but to the periphery of the wavelike junction part 4a joined with a surface sheet and a back surface sheet inside an absorptive main body. In this case, when the wing portion is fixed with a hot melt adhesive or the like, the ink assembly portion 24 suppresses the impregnation of the adhesive and appropriate impregnation of the pressure-sensitive adhesive, thereby improving the adhesive fixing strength. This is preferable because the wing portion can be effectively prevented from falling off the absorbent main body. Moreover, since design nature can further be improved by the design via a surface sheet, it is preferable.

  The degree of pressure-sensitive adhesive impregnation in the printing area and the non-printing area where the ink assembly 24 is formed can be evaluated by the following method.

According to measurement using a sample 1 (KES-G5) of an air-through nonwoven fabric (sheath: polyethylene, core: polyester, 2.2 dtex 51 mm fiber) of 25 g / m ² , in which the ink collecting portion 24 was formed at a thickness position of 45%. Non-woven fabric sample 2 (T0 thickness 0.44 mm measured by using KES-G5), non-printed non-woven fabric sample 3 (T0 thickness 0.42 mm), ink gathered portion 24 formed at a thickness position of 21% Toyomelt P-610GC manufactured by Toyo Adre Co., Ltd. with a basis weight of 30, 50, 70 g / m ² and a width of 5 mm is used as a release paper (Forest Paper Works (T0 thickness 0.45 mm measured by KES-G5). the adhesive was coated onto Ltd.) 30 g / m ^2), it was cut to a length 100 mm, and fixed on the nonwoven fabrics, subjected to impregnation assessment . In Samples 1 and 2, the pressure-sensitive adhesive was impregnated on the surface of the ink collecting portion 24 opposite to the surface to be biased. Impregnation is a weight of adhesive transfer on a hot plate set at around 180 ° C. in an environment of 23 to 28 ° C. (300 g including grip part, thermal transfer partial width 15 mm, length 160 mm, number of evaluations prepared or evaluated After 3 hours from the start of heating / transfer, the surface is fixed with the adhesive. Was evaluated in the state of the adhesive sticking out to the opposite surface. Although the exudation state can be evaluated by tactile sensation, the tissue paper is heated / transferred in contact with the above opposite surface on tissue paper (manufactured by Nippon Paper Crecia Co., Ltd., Kleenex), and whether or not the tissue paper is stuck Judged.
The non-printed non-woven fabric (Sample 3) is attached with an adhesive of 30 g / m ² , and the non-woven fabric (Sample 2) in which the ink collecting portion 24 is formed up to a thickness position of 21% is attached with an adhesive of 70 g / m ^2. In the non-woven fabric (sample 1) in which the ink collecting portion 23 was formed up to a thickness position of 45%, the adhesive was 70 g / m ² and there was no sticking. From the viewpoint of suppressing the bleeding of the pressure-sensitive adhesive (impregnation), the thickness position is preferably 25% or more.

  The absorbent article of the present invention is not limited to the above embodiment, and the present invention can be applied to, for example, incontinence pads, incontinence liners and the like. Moreover, it is effective not only for menstrual blood but also urine, orimono, loose stool, and the like. In addition to the top sheet 1, the absorbent body 3, and the back sheet 2, members may be appropriately incorporated according to applications and functions. In addition, the material of the top sheet 1, the absorbent body 3 and the back sheet 2 of the sanitary napkin of the above embodiment, the conditions in the manufacturing method, and the dimensional terms of the product are not particularly limited, and are used in ordinary sanitary napkins and the like. Various materials can be used.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 4 Outer seal part 5 Leak-proof groove 10 Absorbent main body 20,30,40 Wing part 21,33,41 Nonwoven fabric 22 Adhesive part 23 Print area 24 Ink gathering part 31 Upper nonwoven fabric layer 32 Lower layer Nonwoven fabric layer 100 Sanitary napkin

Claims (3)

Surface sheet disposed on the skin contacting side, an absorbent body comprising an absorbent body interposed between the back surface sheet and the both sheet disposed non-skin facing side, the absorbent body An absorbent article having a pair of wings protruding outward in the width direction from the side edges in the longitudinal direction in the region opposite to the excretion part, wherein the wings are made of nonwoven fabric , and the non-skin contact surface side of the nonwoven fabric Has an adhesive part for fixing to the underwear,
The Lee ink collecting portion in the vicinity of the intersection of the configuration fibers in the nonwoven fabric opposite to the region where the adhesive part is present is formed, the ink collecting portion is interspersed arranged in the thickness direction, the arrangement of the nonwoven fabric Absorbent article biased on one side . The absorbent article of claim 1, wherein the ink collecting portion of the nonwoven fabric serving as the wing portion the adhesive portion is formed on the surface opposite to the surfaces biased. The absorbent article of claim 1 wherein the adhesive portion is formed on the surface on which the ink collecting portion of said nonwoven fabric to bias the said wing portion.

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