JP5329806B2 - Absorbent article surface sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaped sheet of an absorbent article which achieves the high liquid absorption and liquid retainability of an absorbent article, suppresses liquid remaining on a surface, is excellent in a cushion property and softly touches the skin. <P>SOLUTION: The shaped sheet comprises fibers in which projecting portions 3 are disposed roughly zigzag, the projecting portions 3 hold space inside, and the projecting portions 3 are connected to each other by ridge portions 5 narrower than that to form a projecting portion column 11. the projecting portion columns 11 are arranged side by side so that groove parts 8 disposed between them are in a polygonal line shape, and the groove parts 8 in the polygonal line shape have dent portions 4 on both sides of the ridge portion 5. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a surface sheet of an absorbent article. In particular, it is related with the surface sheet of the absorbent article used directly on a wearer's skin.

  Absorbent articles such as disposable diapers, sanitary napkins, panty liners, and disposable diapers are usually in contact with the wearer's skin and used for absorbing and holding liquids. In particular, it is often used in places that are prone to rough skin, and may be worn for a long time. For this reason, a soft and gentle skin is desired. On the other hand, the absorbent article is required to have liquid absorbability and liquid retention.

An attempt has been made to develop a surface sheet having the above-described functionality and good tactile sensation. For example, in Patent Document 1, two layers of non-woven sheets are joined by a plurality of intermittent pin embosses, the lower layer sheet is selectively shrunk by heat drying, and the upper layer sheet is separated so as to wave. A surface sheet is disclosed. Patent Document 2 discloses a surface sheet that is composed of an upper layer sheet and a lower layer sheet and has a large number of convex portions that are hollow inside. The bottom part of the convex part of the surface sheet described in Patent Document 2 is rectangular, and the convex part as a whole has a rectangular parallelepiped or truncated quadrangular pyramid shape.
However, in the surface sheet described in Patent Document 1, the sheets are fixed to each other by the joint portion in the recess, but the sheet is separated from the sheet in other portions, and the structure is weak against external pressure. Is difficult to maintain. Moreover, in the structure illustrated with the surface sheet of patent document 2, although shape maintenance property is high, a convex part cannot move flexibly and there may be a sense of incongruity and a hard impression.

JP 2002-165830 A JP 2004-174234 A

  An object of the present invention is to provide a surface sheet of an absorbent article that achieves high liquid absorbency and liquid retention of the absorbent article, suppresses liquid residue on the surface, is rich in cushioning properties, and soft to the skin. . In addition, the present invention is particularly smooth and soft to the touch, suppressed liquid residue on the surface, good permeation of high-viscosity liquid, excellent drapeability, and the convex structure is flexible, giving the wearer an uncomfortable feeling. Provided is a top sheet of a difficult absorbent article. Furthermore, even when the body pressure is applied and the surface sheet is crushed, it is difficult for the liquid to return, and even if crushed once, the thickness of the sheet is easy to recover. An object of the present invention is to provide a top sheet of an absorbent article having good air permeability in a direction parallel to the surface.

  The above-mentioned problem is a surface sheet made of fibers in which convex portions are arranged in a substantially staggered pattern, wherein the convex portions hold a space inside, and the convex portions are mutually connected by narrower ridges. Connected to form a row of convex portions, and the rows of convex portions are arranged in parallel so that the groove portions arranged between them are in the form of a polygonal line, and the polygonal line-like groove portions have a valley portion on both sides of the ridge portion. Solved by the sheet.

  The surface sheet of the absorbent article of the present invention exhibits a high liquid absorbability and liquid retention of the absorbent article, suppresses liquid residue on the surface, is rich in cushioning properties, has a soft touch, and has a gentle texture. In addition, the surface sheet of the present invention is smooth and soft to the touch, suppresses liquid residue on the surface, excellent permeation of high-viscosity liquid, is excellent in drapeability, and has a convex structure so that it is uncomfortable for the wearer. Is hard to give. Furthermore, even when the body sheet is crushed and the top sheet is crushed, it is difficult for the liquid to return, and even if crushed once, the thickness of the sheet is easy to recover, and the soft and smooth feel after wearing lasts for a long time. Thus, a sheet having good air permeability in the direction parallel to the sheet surface can be obtained.

Hereinafter, the present invention will be described in detail with reference to the drawings showing preferred embodiments thereof.
FIG. 1 is a partial perspective view schematically showing a main part of one embodiment of a surface sheet of an absorbent article of the present invention, and FIG. 2 is an enlarged view showing a portion of region II in FIG. 1 from a slightly different angle. It is a perspective view. The topsheet 10 of this embodiment has an upper layer sheet 1 and a lower layer sheet 2. The top sheet 10 is preferably applied to an absorbent article such as a sanitary napkin or a disposable diaper, for example, and an absorber is disposed on the bottom surface of the lower layer sheet 2 so that the upper layer sheet 1 is directly applied to the skin of the wearer. be able to.

  A large number of convex portions 3 are provided in a substantially staggered pattern on the upper sheet 1 side of the topsheet 10 of the absorbent article of the present embodiment, that is, on the side in contact with the skin of the wearer. The convex portion 3 holds a dome-shaped space 6 formed by the concave-convex shaping of the upper layer sheet 1, and an extremely soft and soft touch-sensitive touch is obtained. That is, even if the convex part 3 acts as an air cushion and a wearer's skin has undulations, it can fit softly and give a soft touch. Further, in addition to air easily moving along the groove portion, the dome-shaped space 6 inside the convex portion holds air, which can enter and exit. In addition, even if there is excretion of high-viscosity liquid such as loose stool or semi-solid, first stock it in the valley, then move the low-viscosity liquid to the space 6 inside the convex part or the lower layer sheet of the top sheet Because it is concealed and absorbed, it does not cause discomfort to the wearer. Especially for infants, it is possible to avoid loose stool or diarrhea stool from touching the skin as it is, and to keep the skin clean and effective in suppressing rough skin and rash.

  The convex portions 3 arranged in a substantially staggered manner in the top sheet of the present embodiment are connected by a ridge portion to form a convex portion row 11 (11a, 11b, 11c, 11d...). In FIG. 2, the three convex part rows of the convex part row | line | column 11a, the convex part row | line | column 11b, and the convex part row | line | column 11c are shown. And each convex part row | line | column 11a, 11b, 11c is parallel, and the polygonal groove part formed so that the trough part 4 distribute | arranged to the both sides of the ridge part 5 might be connected between adjacent convex part rows | lines. 8 is arranged. The bottom surface of the groove portion 8 is not a flat surface, but small convex portions 9 are alternately arranged so as to form a small mountain between the valley portions 4 to form a undulating bottom surface shape. Further, a tunnel-like space 7 (see FIGS. 3 and 4) is provided inside the ridge portion 5, and the spaces 6 inside the adjacent dome-shaped convex portions are connected to each other.

  As described above, the surface sheet according to the present embodiment has a unique outer surface shape in which the mountain-shaped convex portion rows formed by connecting the convex portions are arranged side by side with the gently curved valley-shaped groove portion interposed therebetween. Have And the dome-shaped space 6 inside the convex part is connected by the tunnel-shaped space 7, and this specific internal space and the above-mentioned specific outer surface shape form a three-dimensional network. The individual action of the topsheet in the absorbent article formed by this network structure will be described in detail later, whereby the topsheet of this embodiment is draped (bently deformed and buckled even on the skin surface having complex undulations). It fits without any change and has the property of being able to follow even if the undulation shape of the skin changes due to the movement of the wearer. For example, it is particularly effective when used in contact with a part that moves up and down in a complicated manner such as the crotch part, and it makes contact without giving an excessive gap between the top sheet and the skin, and its good fit Sex is maintained. Furthermore, even if the surface sheet as a whole is low in weight, it has a sufficient thickness and is cushioning, and even if the convex part etc. is crushed by body pressure etc. once, the shape is restored and the soft feel is lost. It will last without. Moreover, in the absorptivity of a liquid, a loose stool, etc., the effect | action which transfers or conceals a liquid etc. to an absorber with the network of the said specific outer surface shape and internal structure is high. Thereby, even after excretion of liquid or loose stool, no discomfort is given, and adhesion due to reversal of loose stool or the like is suppressed and a clean skin state is maintained.

  3 is a cross-sectional view showing a cross section taken along line III-III in FIG. In this cross section, the convex portion 3 is connected by the ridge portion 5, and the space 6 inside the dome-shaped convex portion is spatially continuous in the tunnel-shaped space 7. Thereby, soft stool or the like is effectively concealed in the internal space network formed by the space 6 and the space 7. The permeabilizing action of soft stool or the like can be explained as follows. If there is excretion of loose stool or the like, on the outer surface of the top sheet, it first moves toward the bottom of the groove 8 and then passes between the fibers of the top sheet. Retained. Here, the soft stool or the like stored in the internal space 6 is gradually dampened by moisture absorbed by an absorbent body or the like disposed on the lower side of the top sheet, and is not reversed, maintaining good tactile sensation for the wearer. . And the surface sheet of this embodiment has the space 6 inside the dome-shaped convex part connected by the tunnel-like space 7 inside the ridge part. For this reason, even when a large body pressure is applied to the top sheet, for example, it is possible to suppress / prevent back return to the skin contact surface side by suppressing deformation by the ridge portion or the like. In addition, soft stool or the like stored in the space 6 is diffused in the surface direction of the surface sheet through the tunnel-like space 7 to suppress / prevent back-return to the skin contact surface side. Thereby, even if there is excretion of high-viscosity liquid or semi-solid matter contained in loose stool or falling goods, a very good wearing feeling and a clean state of the skin can be maintained for a long time.

The height _{h t} of the protrusions 3 in the topsheet of the present embodiment is not particularly limited, but is preferably 0.7～7Mm, more preferably 1 to 2.5 mm. Further and in this embodiment it is as the height h _o of the ridge portions 5 than the height h _t of the protrusions is lower, the ratio of the height of the protrusions 3 and the ridge 5 (h o _/ h _t) Is preferably 0.15 to 0.8. Incidentally, speaking of the relationship between the height h _s of the height h _o from the small protrusions 9 of the ridge section 5 in the present embodiment _(see FIG. 5) where the small protrusion 9 so as to be lower than ridges it is the height ratio of the ridge portion 5 small protrusions 9 _(h s / h _o) is preferably from 0.1 to 0.9. Although it does not specifically limit about the space | interval of the MD direction of the vertex of a convex part, It is preferable that it is 1.5-10 mm, More preferably, it is 2 mm-6 mm. Here, the MD direction refers to a direction in which a sheet material such as a nonwoven fabric flows during manufacture, and is an abbreviation of “Machine Direction”, which is sometimes simply expressed as MD to indicate the direction. On the other hand, the CD direction is a direction orthogonal to the MD direction, which is an abbreviation of “Cross Direction”, and may be simply expressed as CD to indicate the direction.

In the present invention, the convex portion or the space inside the ridge portion is a convex portion protruding to a predetermined surface side (usually the skin contact surface side) of a predetermined sheet (upper sheet 1 in this embodiment) constituting the surface sheet. It refers to a concave shaped portion formed on the back side (usually the non-skin contact surface side) corresponding to the shaped shaped portion. Such a convex portion having an internal space is sometimes referred to as a hollow structure of the convex portion. When the back surface (usually the non-skin contact surface) of the predetermined sheet is laminated on another predetermined plane (for example, the lower layer sheet 2 or the surface of the absorber), in the internal space, 0. It is preferable that there is an interval of 1 mm or more. This interval is preferably 0.15 to 6.5 mm, more preferably 0.2 mm to 1.2 mm in the interval h _d (see FIG. 3) in the widest portion of the dome-shaped space 6 inside the convex portion. is there. Is preferably 0.1~5mm at intervals _{h n} that dwell in the widest portion of the ridge inside the tunnel-like spaces 7, and more preferably from 0.1 mm to 1 mm.

  4 is a cross-sectional view showing a cross section taken along line IV-IV in FIG. In this cross section, trough portions 4 constituting the groove portions are disposed on both sides of the ridge portion 5, and convex portions 3 are disposed on both sides thereof. As can be seen from the figure, the ridge portion 5 has a tunnel structure. If it says in detail about the shape of the convex part 3 here, the convex part 3 can be functionally divided into the top part 3a, the shoulder part 3b, and the side wall part 3c. The convex portion 3 of the present embodiment has a substantially mountain shape that is rounded from the top portion 3a through the shoulder portion 3b to the side wall portion 3c, and has a hollow space 6 therein. Thus, by using the rounded convex part, even when the absorbent article is slightly displaced due to the wearer's movement or the like, the feeling of rubbing is suppressed and a smooth tactile sensation is obtained.

  Furthermore, in the surface sheet of this embodiment, the convex part 3 is made into the rounded hump shape as above-mentioned. By doing in this way, the surface sheet has a soft and smooth tactile sensation, and also looks soft, smooth and graceful. Moreover, since it has the shape which protruded in the mountain shape from the shoulder part 3b of the convex part to the top part 3a especially, a contact area with a wearer's skin is small. By reducing the contact area between the top sheet and the wearer in this way, the sheet that once absorbed the liquid is brought into surface contact and the sticky feeling is greatly reduced, and a smooth state is realized. The softness, smoothness, smooth tactile sensation, or good appearance that gives such an impression is difficult to obtain if the convex part is a rectangular solid rectangular parallelepiped or truncated quadrangular pyramid. .

  In this embodiment, the side wall part 3c of the convex part 3 has pores (not shown) or thin parts (not shown) formed by sparse fibers. Typically, in sheet forming by meshing rolls having teeth, which will be described later, a nonwoven fabric sheet having a single thickness is unevenly shaped, so that the nonwoven fabric sheet is stretched in the MD direction as a whole. This is because the fibers tend to be arranged, so that a portion where the fibers gather and a portion where the fibers are reduced are easily formed. On the other hand, a portion where the fibers concentrate locally during the manufacturing process is formed.

Here, the convex portion side wall portion 3c is disposed in a portion corresponding to a lower portion (on the non-skin contact surface side) than a substantially middle point of the convex portion height h _t (see FIG. 3). And the convex part side wall part 3c exists in the position which hits the base of the convex part 3 connected to the trough part 4, and since the groove part 8 which arranged the trough part 4 meanders in the shape of a broken line, the flow of excrement in a groove part is suppressed, A viscous liquid such as loose stool or semi-solid is temporarily stored in the valley 4.

In the top sheet of the present embodiment, the upper layer sheet 1 and the lower layer sheet 2 are joined by heat embossing at the valleys 4. However, this joining method is not particularly limited. An adhesion method using ultrasonic embossing or hot melt may be used. The width w _{b of the} valley (see FIG. 4) is not particularly limited, but it is practical that the width is 0.5 to 3 mm in consideration of the relationship with the dimensions of a normal absorbent article.

In the topsheet of this embodiment, the width w _o of the ridge portions 5 is intended narrower than the width w _t of the protrusions 3. Although these specific widths are not particularly limited, for example, the ratio (w _o / w _t ) between the width w _o of the ridge portion 5 and the width w _t of the convex portion 3 is in the range of 0.1 to 0.6. It is preferable.

  5 is an enlarged cross-sectional view taken along the line VV in FIG. In the cross section shown in the same figure, each convex part is connected with the groove part 8 interposed therebetween, and a small convex part 9 is arranged in this groove part. In this embodiment, this small convex part 9 is made lower than the ridge part 5, and has a height higher than the bottom part of the valley part 4 (the part on the lowest non-skin contact surface side). . Due to the small convex portions 9, the bottom surface of the groove portion 8 does not have a flat U-shaped groove shape, but has a functional uneven surface as described above. Moreover, in this embodiment, although this small convex part 9 is in contact with the lower layer sheet 2, it is not embossed like the trough part 4. FIG. As described above, the ridges 5 and the small protrusions 9 having different heights, widths, and joining states are arranged in the arrangement of the substantially staggered protrusions 3 and the valleys 4. It shows functions such as drape that cannot be achieved by forming a groove-like portion with a linear seal.

  If a space is simply formed inside the convex part, it will be easily crushed against a large pressure. However, in the topsheet of this embodiment, the convex part 3 is connected by a narrow ridge part 5 and connected in a mountain range. Therefore, it is not deformed too much when the convex portion 3 is strongly pressed while maintaining a good cushioning property. That is, the deformability of the convex portion 3 by holding the space 6 inside and the deformation by the ridge portion 5 and the small convex portion 9 are suppressed, and the convex portion is not crushed so that a very good cushioning property is realized. The The ridge portion 5 and the small convex portion 9 are sandwiched between the valley portions 4 formed by joining or bonding the upper layer sheet and the lower layer sheet, and since the curvature is smaller than the convex portion 3, it is difficult to cause the deformation. On the other hand, deformation can be suppressed in a stepwise manner depending on the height of each of the ridge portion 5 and the small convex portion 9. Therefore, when the top sheet of the present embodiment is applied to an absorbent article and used in contact with the skin, the periphery of the top of the convex portion 3 is deformed to give a soft feeling to a small pressure, and a large pressure is applied. In contrast, not only the convex portion 3 but also the ridge portion 5 and the small convex portion 9 are elastically supported. As a result, even when various pressures are applied to the surface sheet due to the movement and weight of the wearer, the surface sheet responds functionally and exhibits an appropriate repulsive force, resulting in a soft and gentle skin contact.

  Moreover, since the convex part 3 is not isolated but connected by the elastic ridge part 5, even when the sheet is bent, the convex part 3 is unlikely to be irreversibly deformed. Thus, even if the sheet is subjected to a large bending deformation due to the undulation or intense movement of the skin, the connection structure with the convex portion 3 and the ridge portion 5 is restored after being weakened, and the state of the soft topsheet with the original thickness is restored. To recover. Further, as described above, the deformation of the convex portion 3 is suppressed at an appropriate height, so that the viscous liquid stored in the space 6 is not easily pushed out, and the return to the skin contact surface side is suppressed. A smooth and clean wearing condition is maintained.

  In the surface sheet of the absorbent article of the present invention, it is preferable to arrange the convex portions 3 in a substantially staggered manner as shown in the above embodiment. Here, the staggered pattern refers to a state in which the convex portions 3 in each example are arranged at equal intervals, and the convex portions are shifted from each other between adjacent rows (preferably a half pitch). More specifically, when the projections 3 of each row are projected in a direction orthogonal to the row, the projections 3 of the projections 3 of a specific row are located between the projection images (preferably in the middle) and adjacent to this. This is a state in which the projected images of the convex portions of the row to be arranged are arranged. The term “staggered” means that the arrangement is slightly shifted in the staggered arrangement, such as an inevitable shift in manufacturing. Thus, by arranging the convex portions 3 in a substantially staggered pattern, the pressure that comes into contact with the wearer's skin is uniformly dispersed, and a good cushioning property is realized. Further, it is also preferable in absorbing and holding liquid because the action is uniformly exerted on the entire sheet.

  Although the top sheet 10 of this embodiment has a two-layer structure of the upper layer sheet 1 and the lower layer sheet 2 (see FIG. 1 and the like), it may be a top sheet (not shown) constituted only by the upper layer sheet 1. As a usage mode in that case, for example, a top sheet made of the upper layer sheet 1 is used by being laminated on the upper surface of the absorber so that the back surface of the non-skin contact surface side (side on which the valley portion 4 is formed) is in contact. Can be mentioned. At this time, you may join the back surface of the surface sheet which consists of the upper layer sheet | seat 1, and an absorber upper surface. By doing in this way, the elasticity and flexibility by the convex part 3 distribute | arranged to the skin contact surface side and the space 6 corresponding to this, and also these being connected by the ridge part 5 are the above-mentioned two layers. It is demonstrated in the same way as the structure. Moreover, also about the permeation | transmission processing functions, such as a liquid and a loose stool, the effect | action which the dome-shaped space 6 and this connect with the tunnel-shaped space 7 is exhibited by the combination with an absorber. At this time, in particular, soft stool or the like concealed inside the space 6 is in direct contact with the absorbent body, which is preferable in that moisture easily moves to the absorbent body and the soft stool or the like is quickly dried. Moreover, it is preferable also in the point which the liquid which moved to the ridge part 5 and the trough part 4 with which the fiber density was raised is directly absorbed and held by the absorbent body without the lower layer sheet 2 being interposed. In addition, the preferable manufacturing method which manufactures the surface sheet of this embodiment as a thing of 1 layer structure is mentioned later.

  FIG. 6 is a pattern diagram schematically showing a six-point emboss pattern in the top sheet of the present embodiment. In the figure, an emboss pattern is shown by squares of 12 rows × 12 columns, and the following is shown as each component of the emboss pattern with 6 points as one set. Emboss (1, 2), (1, 4), (3, 1), (3, 5), (5, 2), (5, 4) at the first 6-point pattern element (first Element). Here, the numerical value in () represents (row number, column number). The second element on the right is composed of 6 points of emboss (1, 8), (1, 10), (3, 7), (3, 11), (5, 8), (5, 10). Has been. Further, the third element below the first element shares two points (5, 2), (5, 4) at the bottom of the first element, so that (7, 1), (7, 5), It is composed of 6 points together with (9, 2) and (9, 4). Further, the fourth element on the right shares the emboss (3, 5), (3, 7), (5, 4), (7, 5), (5, 8) with any of the first to third elements. , And 6 points including emboss (7, 7). In this way, a six-point pattern is widely repeated while sharing a part (at least two points) of each element.

  Thus, by providing the embossed part (valley part) in an intermittent pattern, unlike the case of continuous sealing, the shape is maintained and restored even if the shaped part is broken, and it has good adhesion to the skin roughness The effect that a state is maintained increases. Moreover, since the valley part was made by the local shaping of the emboss as described above, the convex part formed corresponding to this is kept at a low fiber density, and is excellent in tactile sensation and liquid absorption performance. Furthermore, a high liquid leakage prevention effect is exhibited by adopting the arrangement of the convex portions as described above. Specifically, when the topsheet 10 of the absorbent article is used as a topsheet for disposable diapers, for example, diapers for low-age children who excrete loose stool, which is a highly viscous excrement, the following effects are exhibited. Since soft stool has a high viscosity, it is generally difficult to permeate the surface sheet quickly and stays on the sheet and tends to cause a lateral flow. On the other hand, according to the surface sheet 10 of the absorbent article of the present embodiment, the valley portion 4 is formed in the groove portion 8 meandering in the shape of a polygonal line and surrounded by the convex portion 3 and has a substantially mortar shape. Soft stool is captured in (see FIGS. 1 and 2). Thereby, it becomes difficult to cause a lateral flow, and the movement of the liquid component contained in the soft stool toward the absorber is promoted. As a result, liquid leakage from soft stool can be effectively prevented. And inside the convex part 3, there is a space 6, in which soft stool can be stored and concealed. This hiding action is made uniform by arranging the convex portions 3 in a substantially staggered pattern, and a clean state can be maintained over the entire sheet surface. Although the above-described action has been described by taking loose stool as an example, the same action can be obtained when it is used as a top sheet of a sanitary napkin for absorbing high-viscosity excreta contained in descending goods and the like.

In the surface sheet 10 of the absorbent article of the present embodiment, the fibers constituting the upper layer sheet 1 or the lower layer sheet 2 are not particularly limited, and for example, those having a fineness of 1 to 8 dtex are preferably used. In the present embodiment, the upper layer sheet 1 and the lower layer sheet 2 are each shown as having a single layer structure, but may be two or more layers, and other functional layers may be provided between and / or outside each layer. Also good. The basis weight of the upper layer sheet 1 and the lower layer sheet 2 is not particularly limited, but the basis weight of the upper layer sheet 1 and the lower layer sheet 2 is in the range of 8 to 80 g / m ² in consideration of application to a normal absorbent article. That is practical.

  It is preferable to use a nonwoven fabric as the upper layer sheet 1 and the lower layer sheet 2. Examples of the nonwoven fabric include air-through nonwoven fabric and heat bond nonwoven fabric manufactured by the card method, and various nonwoven fabrics such as spunbond nonwoven fabric, meltblown nonwoven fabric, spunlace nonwoven fabric, and needle punched nonwoven fabric. Moreover, when joining the upper layer sheet | seat 1 and the lower layer sheet | seat 2 by thermal fusion so that it may mention later, it is preferable that a thermal fusion fiber is contained in the said nonwoven fabric. As the heat-fusible fiber, those having a core-sheath structure such as PET / PE and PP / PE are preferable. The nonwoven fabric is preferably subjected to a hydrophilic treatment using a surfactant or the like. Among the types of constituent fibers of the upper layer sheet 1 and the lower layer sheet 2, a preferable combination is a combination of PET / PE fibers. Among them, in the present invention, the elongation at break in a predetermined direction (when the original length of the nonwoven fabric in a weak state is L1, and the length when stretched is L2, the nonwoven fabric is stretched and broken in a specific direction. It is preferable to use a nonwoven fabric having an elongation ratio ((L2-L1) / L1)) of 50% or more. By using such a nonwoven fabric, a surface sheet having a uniform shaped shape can be obtained.

Next, the preferable manufacturing method of the surface sheet 10 of the absorbent article of this embodiment is demonstrated, referring drawings. FIG. 7 is a process explanatory view schematically showing one embodiment for producing the top sheet of the absorbent article of the present embodiment. As shown in the figure, first, the upper layer sheet 1 is fed out from a raw fabric roll (not shown). Separately from this, the lower layer sheet 2 is fed out from a raw fabric roll (not shown). The upper layer sheet 1 and the lower layer sheet 2 are respectively fed out along the MD direction (directions d ₁ and d ₂ ).

The meshed portion P of the fed upper layer sheet 1 between the first roll 51 having a concavo-convex shape on the peripheral surface and the second roll 52 having a concavo-convex shape meshing with the concavo-convex shape on the peripheral surface. ₁ , the upper sheet 1 is unevenly shaped. It is preferable that a suction hole (not shown) is formed in the tooth groove portion of each gear in the first roll 51. The tooth groove portion corresponds to a recess in the uneven shape on the peripheral surface of the first roll 51. The suction hole communicates with a suction source (not shown) such as a blower or a vacuum pump, and a meshing portion P between the first roll 51 (rotation direction: arrow d ₅ ) and the second roll 52 (rotation direction: arrow d ₇ ). it is preferably controlled so as to be sucked from ₁ up to the portion P ₃ for feeding the top sheet joined to the upper layer sheet 1 and lower layer sheet 2. Accordingly, the upper layer sheet 1 formed with the unevenness by the meshing of the first roll and the second roll is kept in the state where the unevenness is formed while being in close contact with the peripheral surface of the first roll 51 by the suction force by the suction holes. Is done.

The merging portion P _2, the upper layer sheet 1 while being sucked in close contact with the peripheral surface of the first roll 51 is laminated with the lower layer sheet 2 being fed separately. Here, it is preferable to sandwich both sheets between the first roll 51 and the third roll 53. As the third roll 53, an anvil roll having no irregularities is preferably used, and it is preferable to heat only the third roll 53 to a predetermined temperature. Thereby, the upper layer sheet 1 and the lower layer sheet 2 located at the tip of the convex portion of the gear of the first roll 51 are joined by thermal fusion. A valley 4 (see FIGS. 1 and 2) is formed when the surface sheet is formed by this pressure bonding. On the other hand, the upper layer sheet 1 and the lower layer sheet 2 are not pinched in the concave portion of the gear, and heat fusion does not occur, and the convex portion 3 (see FIGS. 1 and 2) is formed. That is, in the present embodiment, since the heat treatment is not performed in the sheet shaping by the first roll 51 and the second roll 52, the softness is maintained at the top of the convex portion 3. Therefore, when it is used as a top sheet, even if the nonwoven fabric fibers are heat-melted and hardened somewhat in the part that becomes the valley part 4, the convex part 3 protrudes softly, so that the hard part directly touches the skin. A good tactile sensation is realized without contact. The formation of the ridge portion 5 will be described later.

In the manufacturing method of the present embodiment, the composite sheet in which the upper layer sheet 1 and the lower layer sheet 2 are bonded together is heated and pressed at the portion P ₃ sandwiched between the first roll 51 and the fourth roll 54. At this time, like the third roll 53, the fourth roll 54 is preferably an anvil roll having no irregularities on the outer periphery, and is preferably heated to a predetermined temperature. In this way, a firmly fixed joint is formed, and the shape stability of the convex portion is maintained.

FIG. 8 is a process explanatory view schematically showing another embodiment for producing the top sheet of the absorbent material of the present embodiment. As shown in the figure, it is common to the embodiment shown in FIG. 7 in that the first to fourth rolls (51, 52, 53, 54) are used. However, in the embodiment shown in FIG. 8, only the upper layer sheet 1 is used without using the lower layer sheet 2, and the upper and lower sheets 1 have irregularities that form the convex portions 3 and the valley portions 4. Therefore, although it is not joined to another sheet in the valley portion 4, it is heated and compressed by the first roll 51 and the third roll 53 or the fourth roll 54, and the nonwoven fabric fiber is thermally melted and cured. . In this way, it is not only simply bent into a concavo-convex shape, but is shaped so as to be a convex portion 3 and a trough portion 4 exhibiting a specific function when the above-described topsheet is used. In addition, the sheet shaping by the biting of the teeth of the first roll 51 and the second roll 52 and the suction from P _{1 to} P ₃ by the first roll 51 are the same as in the embodiment shown in FIG.

FIG. 9 is a pattern diagram schematically showing a state in which the teeth of the first roll and the second roll are engaged with each other in the manufacturing method of the embodiment shown in FIG. 9 shows a state projected from the direction of the first roll and the arrow IX in Figure 7 the tips of the both rolls teeth in the point P ₁ teeth are bite of the second roll, the solid line second The tooth (tip of tooth) 52a of the roll 52 is shown, and the dotted line shows the tooth (tip of tooth) 51a of the first roll 51. However, both actual rolls are circular in the front view (see FIG. 7) and mesh with each other only with one row of teeth. In FIG. 9, this is viewed as if the teeth on the opposing flat plates mesh with each other. (or sent to the MD direction of the meshing state at point P ₁ sequentially in time) are shown patterned plotter.

  Hereinafter, the meshing state of the teeth of both rolls will be described in more detail. In the pattern diagram shown in FIG. 9, since it is the state seen from the direction IX in FIG. 7, the tooth tip 51a protrudes toward the front side of the paper in a direction in which the tooth tip 52a is immersed in the back side of the paper. It can be said that it moves in the coming direction and the two mesh. In other words, the upper end sheet 1 (not shown in FIG. 7) is pushed in while the front end 52a of the tooth is immersed in the back side of the paper, and is locally bent to form the convex portion 3 (see FIG. 1) when the top sheet is used. Form many shapes. On the other hand, the tip 51a of the tooth pushes up the upper layer sheet toward the front side of the page, and a number of local bent shapes forming the valley 4 are formed when the surface sheet is formed. The upper layer sheet thus formed with unevenness is maintained in close contact with the first roll and sent to the third roll, and is laminated with the lower layer sheet 2 sent separately as described above ( (See FIG. 7). Then, both the sheets are heated and compressed by the tooth tip 51a of the first roll 51 and the peripheral surface of the third roll 53 to the fourth roll 54, and heat embossing is formed at the tooth tip 51a portion. Is done.

Here, when T _{1 to} T ₆ are taken out of the tooth tip 51 a in FIG. 9, the tooth tips T _{1 to} T ₆ each form a valley 4. At this time, the non-woven fabric of the portion pushed out or pushed in by the tooth tips 51a and 52a moves locally by stretching or compression, and for example, fibers located at the tips try to enter the gaps between the teeth of both rolls. At this time, since tension is normally applied to the upper layer sheet 1 in the MD direction, this influences and gives a specific movement in the flow of the nonwoven fabric fibers forming the upper layer sheet. Specifically, when the fiber is going to enter between the teeth of the tooth tips T _{1 to} T ₆ described above, each of the MD direction and the CD direction is related to the sheet tension applied in the MD direction. The flow state of the fibers is different. That is, in the region 91 formed between the tooth tips T ₁ and T ₄ and between the tooth tips T ₃ and T ₆ , the amount of fibers entering from the other regions 92 increases, and the surface sheet is obtained. Sometimes a portion that becomes the ridge 5 is formed. And since the part of the area | region 91 is not heat-narrowed by the front-end | tip 52a of a tooth | gear, it is not joined to the lower layer sheet | seat 2 in that part, but the tunnel-shaped space 7 in a surface sheet is formed. In addition, MD direction in FIG. 9 is corresponded to X direction in the surface sheet of embodiment shown in FIG.1 and FIG.2.

On the other hand, in the region 92, the amount of entering fibers is relatively small, and as a result, when the surface sheet is formed, a small convex portion 9 (see FIG. 5) is formed. In this way, the valley portion 4 formed by the portion narrowed by the tooth tip 51a and the small convex portion 9 continuously form a polygonal groove portion. The form when the groove portion is specifically shown in the figure is shown. The rows formed by T ₁ , T ₂ , and T ₃ , and the rows formed by T ₄ , T ₅ , and T ₆ are each along the MD direction. Thus, a continuous groove portion 8 is formed. Therefore, the mountain-shaped convex part row | line | column 11 by which the convex part and ridge part in the surface sheet were connected to the X direction in FIG.1 and FIG.2 is along MD direction (refer FIG. 9) in the manufacturing method of this embodiment. Formed. On the other hand, the cross-sectional shape shown in FIG. 4 extending in the Y direction of FIGS. 1 and 2 is formed along the CD direction shown in FIG.

Here, an area of a hexagon connecting the centers of T _{1 to} T ₆ of the teeth (tip surface) 51a of the first roll is defined as a basic area A. The area included in the hexagon connecting the centers of T _{1 to} T ₆ of the teeth 51a of the first roll is defined as area B, and the ratio of area B to basic area A (B / A) is 0.10 to 0.25. Is preferred. If the value of this ratio (B / A) becomes too small, there will be no difference between the convex part 3 and the ridge part 5, and it will become one convex part, and the ridge part 5 cannot be molded, so it will be easily crushed. If the value of this ratio (B / A) becomes too large, the space of the ridge portion 5 is lost and the continuity of the space is impaired. Further, the ratio (C / A) of the area C of the tooth (tip surface) 52a of the second roll within the basic area A to the basic area A is preferably 0.10 to 0.25. If the value of this ratio (C / A) becomes too small, the shape of the shaped part 3 is not stable and it is difficult to mold the convex part. When the value of this ratio (C / A) is too large, the convex portion becomes a rectangular parallelepiped shape, becomes hard and the soft feeling is lowered. The value obtained by dividing the tooth interval 97 of the first roll by the CD dimension 98 of the second roll tooth is preferably 0.25 to 0.83. In the setting range of this value, the most stable convex portion 3 and ridge portion 5 having a substantially chevron shape can be obtained.
Although MD dimension 101 of the tooth | gear of a 1st roll is not specifically limited, For example, it is preferable that it is 0.5-3.5 mm, More preferably, it is 0.6-2 mm. Further, the CD dimension 100 is not particularly limited, but is preferably 0.5 to 3.5 mm, and more preferably 0.6 to 2 mm. Moreover, although 97 between the teeth of a 1st roll is not specifically limited, For example, it is preferable that it is 0.8-5 mm, More preferably, it is 1-2 mm. Although MD dimension 99 of the tooth | gear of a 2nd roll is not specifically limited, For example, it is preferable that it is 0.5-3.5 mm, More preferably, it is 0.6-2 mm. The CD dimension 98 is not particularly limited, but is preferably 0.5 to 6 mm, and more preferably 0.6 to 4 mm. Although the interval 94 between the teeth of the first roll and the second roll can be determined as appropriate, it is preferably 1.5 to 10 mm, and more preferably 2 to 6 mm. The tooth interval 102 in the MD direction of the first roll is not particularly limited, but is preferably 0.4 to 4 mm, for example. Although it does not specifically limit about the space | interval 103 of the tooth | gear of MD direction of a 2nd roll, The same dimension as the space | interval 102 of the tooth | gear of the MD direction of a 1st roll is preferable, for example, it is preferable that it is 0.4-4 mm. Moreover, although it does not specifically limit about the space | interval 104 of the tooth | gear of CD direction, For example, it is preferable that it is 1.2-7.5 mm.
Furthermore, although the height and shape of the teeth of the first roll and the second roll can be appropriately determined depending on the form of the target surface sheet, it is preferably, for example, 0.8 to 9 mm. In addition, about FIG. 9, although the shaping | molding of the sheet | seat by the biting of the teeth of a 1st roll and a 2nd roll was demonstrated in relation to the manufacturing method of the embodiment shown in FIG. 7, this was shown in FIG. The same applies to the manufacturing method of the embodiment.
Moreover, the nonwoven fabric whose break elongation rate of MD is 100% or more is preferable, and the surface sheet of the preferable shaping shape of this invention can be processed.

  FIG. 10 is a perspective view schematically showing a disposable diaper using the top sheet of the absorbent article of the present invention with a part cut away. The disposable diaper 80 shown in the figure has a general form in the article, and is formed by combining an outer package 81 and an absorber 88.

The outer package 81 may be composed of a single sheet or a plurality of sheets. The outer package 81 is provided with a lateral leakage prevention gather 84, which is effective in preventing liquid leakage due to the movement of the infant. In the diaper of this embodiment, a functional structure part, a sheet material, etc. may be provided.
Furthermore, the diaper of this embodiment is shown as a tape-type diaper, and a tape 85 is provided on the flap portion on the back side r. This tape can be attached and fixed to a tape applying portion (not shown) provided on the flap portion of the ventral side f. At this time, the diaper center c is gently bent inward, and the absorbent body 88 is worn so as to be stretched from the buttocks to the lower abdomen. As a result, excreta is accurately absorbed and held by the absorber 88.

  In the absorbent body 88, the top sheet 10 of the present embodiment is disposed on the surface of a thick absorbent material 83. Usually, the absorbent material itself does not have very good contact with the skin and gives a sticky feeling after absorbing the liquid once. However, as described above, the surface sheet of this embodiment is disposed so as to contact the skin of the infant. As a result, the touch is improved and the feel is smooth. In particular, the convex portion that holds the space, the valley portion, and the ridge portion having a special shape exert the above-described various effects due to the network structure, and the wear feeling, fit property, and liquid absorption performance of the absorbent article are greatly improved. Etc. are improved. Moreover, it does not give a sense of incongruity when the diaper is slightly out of position due to exercise, etc. around soft skin. Furthermore, since many rounded convex portions are continuously provided on the surface, the external appearance is soft and gives the viewer a gentle impression on the skin.

  In the diaper 80 of the present embodiment, materials used for the outer package 81, the tape 85, the gathers 84, the absorbent material 83, and the like can be those normally used for diapers, and are not particularly limited. The surface sheet of the absorbent article of the present invention is not limited to the disposable diaper, and can be suitably used for various absorbent articles such as napkins and panty liners.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is limited and interpreted by these Examples.

Example 1
As the nonwoven fabric constituting the upper layer sheet, 2.2 dtex × 51 mm core-sheath type composite fiber 6 g / m ² and 4.4 dtex × 51 mm core-sheath type composite fiber 12 g / m ² having a core made of polyethylene terephthalate and a sheath made of polyethylene are used. A laminated air-through nonwoven fabric having a basis weight of 18 g / m ² was used. The upper layer sheet is bent in the MD direction by the shaping process, so that the basis weight is increased, so that after shaping, the upper layer sheet is 22 g / m ² (the upper layer feeding speed was about 20% higher than the lower sheet feeding speed). As a nonwoven fabric constituting the lower layer sheet, an air-through nonwoven fabric having a basis weight of 18 g / m ² having a core-sheath type composite fiber of 2.2 dtex × 51 mm whose core is polyethylene terephthalate and whose sheath is made of polyethylene was used. Using these sheets and using the apparatus shown in FIG. 7, the tooth biting pattern shown in FIG. 9 (interval 94 is 3.2 mm, interval 97 is 1 mm, width 98 is 2 mm, length 99 is 0.8 mm, A top sheet (test material 1) having a 6-point emboss pattern shown in FIG. 6 was produced by a first roll and a second roll having a width 100 of 1 mm and a length 101 of 0.8 mm. The resulting topsheet (test material 1) had a distinctive sheet configuration as shown in FIGS. 1 to 5, the height h _t of the protrusions is approximately 1.7～2.1Mm, the ridges high is _{h o} was approximately 0.6~1.0mm. FIG. 11 shows a surface shape analysis diagram obtained by measuring the surface shape on the upper layer sheet side of this surface sheet (test material 1) with a surface shape analysis microscope (manufactured by Keyence Corporation, VHX-900 (trade name)) and imaging it as a perspective view. Show. In the figure, “t” indicates a convex portion, “b” indicates a valley portion, “o” indicates a ridge portion, and “s” indicates a small convex portion. The unit of dimension in the figure is expressed as “um”, but means “μm”.

(Example 2)
As a nonwoven fabric constituting the upper layer sheet and the lower layer sheet, an air-through nonwoven fabric of core / sheath type composite fiber 18 g / m ² of 2.2 dtex × 51 mm whose core is polyethylene terephthalate and whose sheath is made of polyethylene was used. Since the upper layer sheet is bent in the MD direction by the shaping process and the basis weight is increased, it becomes 22 g / m ² after the shaping. (The feeding speed of the upper layer was about 20% higher than the feeding speed of the lower layer sheet) Using these sheets, the tooth biting pattern shown in FIG. 6 points shown in FIG. 6 by the first roll and the second roll, which are 2 mm, the interval 97 is 1 mm, the width 98 is 2 mm, the length 99 is 0.8 mm, the width 100 is 1 mm, and the length 101 is 0.8 mm. An embossed pattern surface sheet (test material 2) was prepared. The resulting topsheet (test material 2) had a specific sheet shape shown in FIGS. 1 to 5, the height h _t of the protrusions is approximately 1.3～1.7Mm, the ridges high is _{h o} was approximately 0.4~0.7mm.

(Comparative Example 1)
As a fiber web constituting the upper layer sheet, a fiber web constituting the lower layer sheet with a basis weight of 16 g / m ² comprising a core-sheath type composite fiber of 7.7 dtex × 51 mm whose core is made of polyethylene terephthalate and whose sheath is made of polyethylene. As an air-through nonwoven fabric, a core-sheath type composite fiber of 3.3 dtex × 51 mm whose core is made of polyethylene terephthalate and whose sheath is made of polyethylene is laminated with a basis weight of 24 g / m ² . These sheets were laminated and joined to obtain a surface sheet (test material 3) for comparison. The thickness of the top sheet (test material 3) was about 1 mm.
(Comparative Example 2)
Two sheets of air-through nonwoven fabric with a basis weight of 20 g / m ² comprising 2.2 dtex × 51 mm core-sheath type composite fiber having a core made of polyethylene terephthalate and a sheath made of polyethylene as the nonwoven fabric constituting the upper layer sheet and the lower layer sheet The surface sheet (test material 4) was obtained using what was joined by the superposition | stacking ultrasonic wave. The thickness of the top sheet (test material 4) was approximately 1 mm.

[Surface liquid return test]
The weight measured surface sheet (test material) is an absorbent material (a pile of fluff pulp and superabsorbent polymer, and the basis weight of the pulp and the basis weight of the polymer are both 257 g / m ² . ). Next, 80 g of artificial urine is injected from the center of the topsheet using a metering pump. Leave for 10 minutes after injection. Then, the weight of the surface sheet was measured and the weight before evaluation was subtracted. The value was made into the surface layer liquid remaining amount of a nonwoven fabric. If the remaining amount of the liquid is 300 mg or less, the practical requirement can be satisfied, and if it is 150 mg or less, the practical requirement can be satisfied at a high level.

(Lateral ventilation test)
About the surface sheet (each test material), the air passage capacity in the direction parallel to the sheet surface under 35 g / cm ² pressure was measured by the following method.
First, the surface when applying a load of 35 g / cm ² using a KES compression tester (Kato Tech Co., Ltd., KES FB-3 AUTO-A (trade name), circular contact area (area 2 cm ² )) The thickness Th1 of the sheet was measured.
The top sheet whose thickness was measured was a square-shaped first acrylic plate (dimension: 50 mm × 50 mm × 3 mm) having a square-shaped opening with a side of 10 mm in the center, and the first acrylic plate except that it did not have an opening. Between the same 2nd acrylic board, the surface turned to the wearer's skin side of this surface sheet was pinched | interposed into the 1st acrylic board side. This is set under the gasket of the Gurley tester (B type) prescribed in “Gurley tester method” of JIS P 8117, with the first acrylic plate side facing up, until the top sheet reaches the thickness Th1. Compress.
Next, the time required to introduce 300 mL of air through the opening is measured at the center of the topsheet that maintains the thickness Th1.
Then, the unit area (1 cm ² ) of the opening × the air introduction amount (cc) per second was calculated. The result of this lateral ventilation test shows the ease of air movement in the top sheet, that is, the squeeze, and if the lateral ventilation amount is 30 cc / sec or more, it satisfies the practical requirement, and if it is 70 cc / sec or more. It can satisfy practical requirements at a high level.

[KES thickness]
About each surface sheet (each test material), using a KES compression tester (Kato Tech Co., Ltd., KES FB-3 AUTO-A (trade name), circular contact area (area 2 cm ² ), 0.5 g / The thickness (sample thickness obtained by adding the thickness of the lower layer sheet to the height h _{t of the} protrusion (see FIG. 3)) when a load of cm ² and 50 g / cm ² was applied was measured. The larger the value, the better the cushioning property is maintained when the diaper is actually worn and used, specifically, the KES thickness is 1.2 or more under the load condition of 0.5 g / cm ² , When the KES thickness is 0.8 or more under a load condition of 20 g / cm ² and the KES thickness is 0.5 or more under a load condition of 50 g / cm ² , a practical requirement can be satisfied.

[Compression hardness (KES) test]
For each surface sheet (each test material) was measured for compressive hardness under a 50 g / cm ² load.
Using a KES compression tester (manufactured by Kato Tech Co., Ltd., KES FB-3 AUTO-A (trade name), circular contact area (area 2 cm ² ), compress the top sheet to 50 g / cm ² load. In the above compression hardness (KES) test, the LC value means compressibility with a small force, and if it is 0.75 or less, the practical requirement can be satisfied. means sensitive to satisfy the practical requirements of long 0.5gf · cm / cm ² or more, to satisfy the practical requirements of long 1.0gf · cm / cm ² or more at a high level .RC The value means compression recovery, and if it is 30% or more, the practical requirement is satisfied at a high level.

[Drapability, KES bending characteristics B 'test]
About each surface sheet (each test material), the bending moment was measured when a constant curvature (± 2.5 cm ⁻¹ ) was given.
The surface sheet was cut into a shape of 20 cm × 10 cm (MD × CD) to obtain a test piece. Using the KES pure bending test machine (Kato Tech Co., Ltd., KES FB-2 AUTO-A (trade name)), the obtained test piece was fixed with a constant curvature (± 2.5 cm) in each of the MD direction and the CD direction. ^-1 ) was measured, and the value of the bending moment with a curvature of ± 2.5 cm ⁻¹ was defined as B ′.
In the drapability and KES bending characteristics B ′ test, it means that the smaller the value, the easier it is to bend, and if it is 0.35 gf · cm ² / cm or less in one direction (MD direction), the practical requirement is satisfied, If it is 0.2 gf · cm ² / cm or less, the practical requirement is satisfied at a high level. If it is 0.20 gf · cm ² / cm or less in the other direction (CD direction), the practical requirement is satisfied.

[Buckling test (folded part of MD) test]
Each surface sheet (each test material) was folded in two (MD direction) using a ruler as a base point, and the state of the fold when opened was confirmed. In this evaluation, if it is ◯ or more, the practical requirement is satisfied, and if it is ◎ or more, the practical requirement is satisfied at a high level.
×: Many folds are formed, wrinkles and corners are formed, and the hardness of the folds is felt.
Δ: A crease is formed, a plurality of wrinkles remain, and the hardness of the crease is felt a little.
○: There are creases but no wrinkles. The hardness of the fold is hardly felt.
◎: No creases and the original state. I do not feel the hardness of the crease at all.

[Hand feeling test]
The tactile sensation was confirmed by directly contacting the surface sheet of the diaper subjected to the above-described surface layer liquid remaining amount measurement test with the palm of the hand. The surface of the topsheet (upper surface) before being incorporated into a diaper was directly touched with the palm of the hand, and the touch was determined according to the following criteria. Judgment was made by three or more people, and the opinion with the most support was taken as the result of the judgment. When the judgment was divided into one person, the opinion that was in between them was taken as the judgment result. In this evaluation, if it is ◯ or more, the practical requirement is satisfied, and if it is ◎ or more, the practical requirement is satisfied at a high level.
X: Hard. There is a sense of resistance.
Δ: Slightly hard There is a little resistance (rough feeling).
○: Slightly soft. There is a little smooth feeling.
A: Soft and smooth feeling.

  From the above results, it can be seen that the surface sheets (test materials 1 and 2) according to the present invention exhibit high surface liquid return and lateral air permeability as compared with the comparative example. Moreover, the surface sheet (test materials 1 and 2) of the present invention is a comparative example in each characteristic evaluation of the above surface sheet (KES thickness test, compression hardness test, drape test, buckling presence test, and hand touch test). Excellent results are shown, and it is easy to follow the undulations of the skin, and it is understood that it has a soft and smooth texture.

It is a perspective view which shows typically the principal part in one Embodiment of the surface sheet of this invention by a partial cross section. It is a perspective view which expands and shows the periphery of the area | region II of FIG. It is sectional drawing which shows the III-III line cross section of FIG. It is sectional drawing which shows the IV-IV sectional view of FIG. It is sectional drawing which shows the VV line cross section of FIG. FIG. 6 is a pattern diagram showing a substantially staggered six-point emboss pattern in the present embodiment as coordinates. It is process explanatory drawing for demonstrating the manufacturing method of the surface sheet of this embodiment. It is process explanatory drawing for demonstrating the manufacturing method of the surface sheet of another embodiment. It is a pattern diagram which shows the arrangement | sequence of the front-end | tip of a tooth | gear when the tooth | gear of a 1st roll and a 2nd roll bites. It is a perspective view showing a disposable diaper using the surface sheet of this embodiment, partly cut out. It is the surface shape analysis figure which measured the surface shape of the surface sheet (test material 1) produced in the Example with the surface shape analysis microscope, and imaged it as a perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper layer sheet 2 Lower layer sheet 3 Convex part 3a Convex part top part 3b Convex part shoulder part 3c Convex part side wall part 4 Valley part 5 Ridge part 6 Space inside convex part 7 Tunnel-shaped space 8 Groove part 9 Small convex part 10 Top sheet 11, 11a, 11b, 11c, 11d Convex part row 51 First roll 51a First roll tooth (tooth tip)
52 Second Roll 52a Second Roll Teeth (Tooth Tip)
53 3rd roll 54 4th roll 80 Disposable diaper 81 Outer package 83 Absorbent material 84 Side leakage prevention gather 85 Tape 88 Absorber 91 Upper layer sheet forming area 92 forming ridge part Upper layer sheet forming area 94 forming small convex part 94 roll Tooth spacing 97 The first roll teeth CD spacing 98 The second roll teeth CD width

Claims (5)

The convex sheet is a surface sheet made of fibers arranged in a staggered pattern, and the convex part has a rounded mountain shape extending from the top part to the shoulder part to the side wall part , and holds a space therein, The convex portions are connected to each other by a narrower ridge portion to form a convex portion row, and the convex portion rows are arranged in parallel so that the groove portions arranged between them are in a polygonal line shape. the have a trough portion on both sides, has a tunnel-like space inside the ridge portion, the top sheet of an absorbent article inner space of the convex portion is Ru are cooperative with each other. The height of the ridge portion, the surface sheet of an absorbent article according to claim 1 is 80% to 15% of the height of the convex portion. The top sheet of an absorbent article according to claim 1 or 2 , comprising a nonwoven fabric having a breaking elongation in a predetermined direction of 100% or more. The surface sheet of an absorbent article according to any one of claims 1 to 3 , wherein the surface sheet is composed of an upper layer sheet and a lower layer sheet joined to each other at the valley portion.   5. The bottom surface of the groove portion has a undulated bottom surface shape in which small convex portions lower than the ridge portion are alternately arranged so as to form a small mountain between the valley portions. A surface sheet of the absorbent article according to 1.