JP6004723B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper.

  In the disposable diaper, it is known to reduce the feeling of wetness that occurs when the surface sheet comes into contact with the skin by reducing the contact area between the liquid-permeable surface sheet and the skin of the diaper wearer. For example, on the surface of the nonwoven fabric in FIGS. 2 and 3 of JP 2008-2034 A (JP2008-2034A, Patent Document 1), a convex portion and a groove portion extending in one direction in parallel with each other are formed. Moreover, in the nonwoven fabric of FIGS. 6 and 7, a plurality of openings are formed in the groove. When these nonwoven fabrics are used as a liquid-permeable surface sheet, the surface sheet comes into contact with the skin at the convex portion, while being separated from the skin at the groove portion.

  Moreover, in FIG. 3 of Unexamined-Japanese-Patent No. 2010-94535 (JP2010-94535A, patent document 2), what has a collar part and a groove part is described as an example of the surface sheet of a napkin. The flange portion and the groove portion extend in one direction in parallel with each other, and a large number of holes are formed in the groove portion.

JP 2008-2034 A JP 2010-94535 A

  When a non-woven fabric having convex portions and grooves extending in one direction parallel to each other, or a ridge and grooves is used as a liquid-permeable surface sheet covering the absorbent body of a disposable diaper, excrement absorbed by the absorbent body May be easily seen through a thin groove portion or an opening formed in the groove portion. In order to prevent this, or to promote the movement of excrement from the top sheet to the absorber, a second top sheet that is liquid permeable may be interposed between the top sheet and the absorber. is there.

  An object of the present invention is to provide an improved usage form of the top sheet and the second top sheet.

  In order to solve the above-mentioned problems, the present invention is intended for a disposable diaper in which a body fluid-absorbing core material is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet.

In such a wearing article, the present invention is characterized as follows.
The core member has a front-rear direction, a lateral direction, and a thickness direction orthogonal to each other in a state where the core member is extended in a planar shape, and the front-rear direction and the lateral direction are the front-rear direction in the diaper. It matches the horizontal direction. The top sheet is a first top sheet extending from a peripheral edge of the core material in the front-rear direction and the horizontal direction, and the core material and the first top sheet are inside the peripheral edge in the horizontal direction. And a second surface sheet joined to the first surface sheet, and the first and second surface sheets are formed of a thermoplastic synthetic fiber subjected to a hydrophilic treatment. . The first surface sheet has a contact surface with respect to the skin of the wearer of the diaper and a non-contact surface that is the opposite surface, and the contact surface extends in parallel to each other in the front-rear direction. The ridges of the strip are formed, the ridges adjacent in the lateral direction are connected to each other at the bottom portion extending in the lateral direction, and the non-contact surface is formed flat. As for the said 2nd surface sheet, each of both surfaces which oppose the said non-contact surface and the said core material is formed flat. In the second surface sheet, an inner portion located in the center in the lateral direction is joined to the first surface sheet via a hot melt adhesive, and is located on both sides outside the inner portion in the lateral direction. The outer portion is joined to the first topsheet at a plurality of first pressing sites that are in a state of being squeezed together with the first topsheet.

In one embodiment of this invention , a plurality of 2nd pressing parts are formed in the 1st surface sheet of the portion located outside the 2nd surface sheet in the transverse direction.

  In one embodiment of the present invention, the second surface sheet has both end portions in the front-rear direction inside the periphery, and the second surface sheet is squeezed together with the first surface sheet at the both end portions. A plurality of the first pressing portions in a state of being formed are formed, and an intermediate portion located between the both end portions in the front-rear direction is joined to the first topsheet via the hot melt adhesive.

  In one embodiment of the present invention, the second pressing portion is also formed in a portion of the first topsheet that is positioned outside the second topsheet in the front-rear direction.

  In one embodiment of the present invention, in the first surface sheet, a dimension from the non-contact surface to the top of the raised portion is in a range of 0.7-3 mm, and the skirt portions facing each other in the lateral direction are arranged. The dimension between the bottom of the valley portion formed by and the non-contact surface is in the range of 0.1-1 mm smaller than the dimension, and the difference between these two dimensions is at least 0.3 mm.

  In one embodiment of the present invention, the number of the ridges formed per 1 cm in the lateral direction of the first surface sheet is in the range of 2-5.

  In one embodiment of the present invention, the first and second compressed portions include those formed at the top of the raised portion.

  In the disposable diaper according to the present invention, a first surface sheet and a second surface sheet formed of a thermoplastic synthetic fiber subjected to a hydrophilic treatment are used as a liquid-permeable surface sheet covering a body fluid-absorbing core material. To do. By using a thing with a higher density than a 1st surface sheet as a 2nd surface sheet, the movement of the bodily fluid of the direction which goes to a core material from a 1st surface sheet can be accelerated | stimulated. In the second topsheet, the inner portion located in the center in the lateral direction of the diaper is joined to the first topsheet via the hot melt adhesive, while the outer portions on both sides in the lateral direction are the first surface at the first pressing site. Join the sheet. The density of the first and second surface sheets positioned in the outer portion is higher than the density of the first and second surface sheets positioned in the inner portion, and the body fluid flowing in the lateral direction in the first surface sheet is transferred to the outer portion. It is possible to absorb quickly where it is located. The first surface sheet is formed on the portion located outside the second surface sheet, and the second pressing portion is formed to increase the density, so that when the portion touches the wearer's skin, the skin of the diaper wearer The body fluid flowing in the lateral direction of the diaper along the path can be absorbed and the body fluid can be prevented from leaking from the diaper.

The partial fracture top view of a disposable diaper. The figure which expands and shows the II-II line | wire cut surface of FIG. The figure which expands and shows the III-III line | wire cut surface of FIG. The figure which shows an example of the distribution state of a pressing site | part. The figure which shows an example of the distribution state of a pressing site | part. The figure which shows an example of the distribution state of a pressing site | part. The fragmentary perspective view of the sheet | seat used as a 1st surface sheet. The figure similar to FIG. 2 which shows an example of embodiment.

  The details of the disposable diaper according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partially broken plan view of a disposable diaper 1. The diaper 1 is of an open type and has a front-rear direction A, a lateral direction B, and a thickness direction C (see FIG. 2) indicated by double-headed arrows, and the front-rear direction A is the same as that of the diaper 1 of FIG. It is also the vertical direction, and the horizontal direction B is also the width direction of the diaper 1. The diaper 1 also includes a liquid-permeable top sheet 2, a liquid-impervious back sheet 3, and a body fluid-absorbing core material 4 interposed between the two sheets 2 and 3. In the front-rear direction A of the diaper 1, a front waistline region 7, a rear waistline region 8, and a crotch region 6 interposed between these two waistline regions 7 and 8 are formed. Both side edge portions 11 of the crotch region 6 are curved so as to protrude toward the inside in the lateral direction B. In both side edge portions 11, hydrophobic, and more preferably has side sheet 5 having water repellency in the hydrophobicity superimposed backsheet 3 by means of hot melt adhesive Ad _1. Between the side sheet 5 and the back sheet 3, a leg-hole elastic member 12 extending in an extended state is joined to at least one of the sheets 3, 5 via a hot melt adhesive (not shown). Tape fasteners 14 for connecting the front and rear waist regions 7 and 8 are attached to both side edges 13 of the rear waist region 8. Between the first top sheet 2a and the back sheet 3 at the end edges 17 and 18 of the front and rear waist regions 7 and 8, waist elastic members 7a and 8a extend in the lateral direction B in an extended state. It is joined to at least one of 2a and 3 via a hot melt adhesive (not shown).

In the figure, the surface sheet 2 shown in a broken state includes a first surface sheet 2a used to come into contact with the skin of a diaper wearer (not shown), a first surface sheet 2a, and a core material 4. And the second surface sheet 2b interposed between the two. The first surface sheet 2a is formed by staples of thermoplastic synthetic fibers 52a (see FIG. 7) subjected to hydrophilic treatment, and the second surface sheet 2b is staples of thermoplastic synthetic fibers (not shown) subjected to hydrophilic treatment. It is formed by a filament. The first topsheet 2a is not extending from the peripheral edge 4a of the core 4 at least in the transverse direction B of the longitudinal direction A and lateral direction B, the portion of output that extends via a hot-melt adhesive Ad ₁ Bonded to the back sheet 3. The second surface sheet 2b is located on the inner side of the peripheral edge 4a of the core material 4, and is symmetrical with respect to the center line PP that bisects the dimension of the diaper 1 in the lateral direction B. inner portion 52 which is shown joined to the first topsheet 2a by means of hot melt adhesive Ad _2, first topsheet 2a in compressed portion 55 of the outer portion 53 is formed in a dot shape to surround the inner portion 52 It joins in the state which closely_contact | adhered to, or the state fuse | melted. In a preferred example of when the first topsheet 2a and the second surface sheet 2b are bonded with a hot melt adhesive Ad _2, hot melt adhesive Ad ₂ intermittently in the longitudinal direction A and / or transverse direction B Applied. Moreover, in a preferable example when the 1st surface sheet 2a and the 2nd surface sheet 2b are closely_contact | adhered in the pressing part 55, the fibers which form both the sheets 2a and 2b are mechanically entangled. In the second topsheet 2b, the outer portion 53 is a peripheral portion of the entire second topsheet 2b, but the portions located on the side when viewed in the lateral direction B can be referred to as both side portions, and the front-rear direction The portion located at the end when viewed in A is a portion that can be called both end portions. The inner portion 52 is a central portion in the lateral direction B of the second topsheet 2b, and in the front-rear direction A, it is preferable that the inner portion 52 extends to a portion where diaper wearer urination is assumed. Therefore, the second surface sheet 2b when the dimension of the second surface sheet 2b in the front-rear direction A is considerably smaller than that of the core material 4 is mostly from the lateral center line QQ of the diaper 1. Is preferably located on the front side. When the diaper 1 is for infants, it is preferable that the dimension in the front-rear direction A is in the range of 50-150 mm and the dimension in the lateral direction B is in the range of 30-100 mm.

  In this invention, although the pressing part 55 is formed with respect to the 1st surface sheet 2a, in the pressing part 55, the 1st surface sheet 2a and the 2nd surface sheet 2b are 2nd surface sheet 2b. The 1st pressing part 55a for joining in the outer side part 53 in and the 2nd pressing part 55b for pressing only the 1st surface sheet 2a in the outer side of the 2nd surface sheet 2b are contained.

  FIG. 2 is an enlarged view of a cut surface along the line II-II in FIG. 1, and the line II-II is a lateral center line QQ that bisects the dimension of the diaper 1 in the front-rear direction A. And one of the double-headed arrows indicates the thickness direction C of the diaper 1. The 1st surface sheet 2a in a figure has the contact surface 56 in the state which contacts a diaper wearer's skin, and the non-contact surface 57 which is the opposite surface. The first surface sheet 2a also includes a covering portion 61 for the core material 4 and an extending portion 62 extending from the peripheral edge 4a of the core material 4. In at least the covering portion 61 of the covering portion 61 and the extending portion 62, a compressed portion 55 is formed in a part thereof. Specifically, a portion of the covering portion 61 that overlaps with the outer portion 53 of the second topsheet 2b is formed with the first pressing portion 55a of the pressing portion 55, and is positioned outside the second topsheet 2b. The 2nd pressing part 55b of the pressing parts 55 is formed in the part to do.

  The pressing part 55 can be formed by processing the top sheet 2 with a heated embossing roll. In the pressing part 55, the first top sheet 2a or the first top sheet 2a and the second top surface overlap with it. The surface sheet 2b is in a state of being locally compressed under heating, and the thickness of the surface sheet 2 is reduced at the compressed portion 55 and its periphery, and the first surface sheet 2a and the second surface sheet 2b are in close contact with each other. By joining, it adheres and it is united by being partly fused and united.

  In the surface sheet 2, such a pressing part 55 is formed with respect to the raised part 34 and the base part 34a in the 1st surface sheet 2a. In the contact surface 56 of the first surface sheet 2a in FIG. 2, the ridges 34 are formed, the ridges 34 are arranged in the lateral direction B, and the adjacent ridges 34 are respectively formed at the bottom. A valley portion 36 is formed by connecting the portions 34a. These raised portions 34 and valley portions 36 extend in the front-rear direction A in parallel (see FIG. 7). In the diaper 1 of FIG. 1, the raised portion 34 and the valley portion 36 extend to the end edges 17 and 18 of the diaper 1 in parallel with each other. However, in FIG. 1, only a part of the raised portion 34 and the valley portion 36 is shown in a very simplified state on the top sheet 2 in order to avoid the drawing from becoming complicated.

In FIG. 2, the second surface sheet 2b has a surface 58 that faces the non-contact surface 57 of the first surface sheet 2a and a back surface 59 that is opposite to the surface 58 and faces the core member 4, and these both surfaces 58, 59 are flat. Is formed. The front surface 58 is joined to the non-contact surface 57 of the first surface sheet 2a via a hot melt adhesive Ad ₂ to which the inner portion 52 is intermittently applied. Moreover, the outer side part 53 of the surface 58 is joined to the 1st surface sheet 2a in the 1st pressing site | part 55a formed in the 1st surface sheet 2a. Backside 59 of the second surface sheet 2b is bonded to the core 4 by hot melt adhesive Ad ₃ that is intermittently applied. However, the 2nd surface sheet 2b can also be stuck to the core material 4 without interposing an adhesive agent. In addition, the 1st pressing part 55a formed also with respect to the 2nd surface sheet 2b via the 1st surface sheet 2a is within 15 mm from the periphery of the 2nd surface sheet 2b in the front-back direction A and the horizontal direction B. It is preferable to form in the range. In other words, the width of the outer portion 53 preferably does not exceed 15 mm. In such a 2nd surface sheet 2b, the inner part 52 is more bulky and flexible than the outer part 53, and the surface sheet 2 can be made into the touch in the center part of the horizontal direction B.

  The core material 4 is formed by covering an aggregate of body fluid-absorbing materials 21 such as pulverized pulp and highly absorbent polymer particles with a wrapping sheet 22 such as tissue paper or a liquid-permeable nonwoven fabric. In the figure, the wrapping sheet 22 is formed by an upper wrapping sheet 22 a and a lower wrapping sheet 22 b, and the two wrapping sheets 22 a and 22 b overlap each other at the peripheral edge 4 a of the core material 4. Both wrapping sheets 22a and 22b can also be bonded to the aggregate of body fluid absorbent material 21 via a hot melt adhesive.

  The back sheet 3 includes a covering portion 3 a for the core material 4 and an extending portion 3 b from the peripheral edge 4 a of the core material 4. The preferable covering portion 3a not only coats the core material 4, but is bonded to the core material 4 via a hot melt adhesive (not shown). The extension part 3 b has a part joined to the extension part 62 in the first surface sheet 2 a and a part joined to the side sheet 5. As the back sheet 3, a thermoplastic synthetic resin film, a laminated sheet of a film and a nonwoven fabric, or the like can be used.

  FIG. 3 is an enlarged view of a cut surface along the line III-III in FIG. 1, and the line III-III is located at the top of the raised portion 34, and the dimension of the diaper 1 in the lateral direction B is two. It extends parallel to the equally dividing longitudinal center line PP. This cut surface indicates a cut surface for the rear waistline region 8 and a part of the crotch region 6 connected thereto, but also indicates a cut surface for the front waistline region 7 and the crotch region 6 connected thereto.

As can be seen in FIG. 3, the first topsheet 2a also includes a covering portion 61 for the core material 4 and an extending portion 62 from the peripheral edge 4a of the core material 4 in the front-rear direction A in the front-rear direction A of the diaper 1. And have. The 2nd surface sheet 2b is located inside the peripheral edge 4a of the core material 4, The outer part 53 currently joined in the 1st pressing part 55a with respect to the 1st surface sheet 2a, and the outer part 53 And an inner portion 52 joined via a hot melt adhesive Ad ₂ . Such an outer portion 53 in FIG. 3 is one of both end portions of the second topsheet 2b. However, in the second topsheet 2b, the outer portion 53 (see FIG. 1) formed in the front and the outer portion 53 formed in the rear are different from the case where the dimensions in the front-rear direction A are the same. There is. The inner portion 52 is also a portion that can be called an intermediate portion located between the outer portions 53 and 53 in the front-rear direction A. The 2nd pressing part 55b is formed in the part which overlaps with the core material 4 at the 1st surface sheet 2a. However, the 2nd pressing site | part 55b may be formed in the extension part 62 of the 1st surface sheets 2a. Of the first surface sheet 2a and the second surface sheet 2b, at least the first surface sheet 2a has a thickness at the portion where the first and second compressed portions 55a, 55b are formed and the peripheral portion thereof. It is thinner than the thickness of the portion overlapping the inner portion 52 in the two-surface sheet 2b. Moreover, as a result, as for the 1st surface sheet 2a, the density in the part in which the pressing site | part 55 is formed, and its peripheral part tends to become high compared with the density of the part in which the pressing site | part 55 is not formed. . In the present invention, the second topsheet 2b is not necessarily required to be in the form of FIG. In an example of an embodiment for carrying out the present invention, the second topsheet 2b may reach the peripheral edge 4a of the core member 4 in the front-rear direction A, or may extend from the peripheral edge 4a.

  In the diaper 1 thus formed, the color of the excrement such as body fluid absorbed by the core material 4 by the second surface sheet 2b being interposed between the first surface sheet 2a and the core material 4. Can be reduced in the degree seen through the valley portion 36 formed in the first surface sheet 2a. Further, by using the second surface sheet 2b having a density higher than the average density of the entire first surface sheet 2a, or having a density higher than the density of the valley portions 36 in the first surface sheet 2a. When the surface sheet 2 has a density gradient such that the density increases from the first surface sheet 2a to the core material 4 by using the two surface sheets 2b, the first surface sheet 2a to the core material 4 The movement of the body fluid can be promoted.

  It is also conceivable that the second topsheet 2b is bonded to the first topsheet 2a only at the inner portion 52. In such a topsheet 2, the second topsheet 2b is outside the second topsheet 2b. A state in which the portion 53 is not in close contact with the first topsheet 2a and / or the core material 4 is likely to occur. As a result, in the thickness direction C of the diaper 1, it is difficult for body fluid to quickly move to the core material 4 through the outer portion 53. However, in the diaper 1 according to the present invention, the outer portion 53 of the second topsheet 2b is in close contact with the first topsheet 2a at the squeezed portion 55. It can be absorbed quickly. In addition, as a phenomenon seen when wearing diapers, urine when the amount of excretion is extremely small may flow along the skin of the diaper wearer before contacting the top sheet, Without being absorbed by the top sheet, it may flow along the skin and cause side leakage in the diaper. However, in the diaper 1 according to the present invention, the first topsheet 2a has the second pressing portion 55b in the portion located outside the second topsheet 2b, and the portion is the inner portion of the second topsheet 2b. Compared to the first surface sheet 2 a located at 52, the density is higher. Therefore, even if there is a possibility that urine may leak from the diaper 1 along the skin, the first surface sheet 2a in which the second compressed portion 55b is formed and densified touches the skin. It is possible to absorb the urine quickly and prevent side leakage.

  The side sheet 5 used for the diaper 1 is in the lateral direction B in the crotch region 6 because it is hydrophobic, more preferably hydrophobic and subjected to water repellent treatment. It acts to prevent flowing excrement from leaking around the legs of the diaper 1. However, in the present invention, instead of using the side sheet 5, the first top sheet 2 a may extend to the side edge 11 of the crotch region 6. As the side sheet 5, a nonwoven fabric formed of thermoplastic synthetic fibers or a film formed of thermoplastic synthetic resin can be used.

  4-6 is a diagram illustrating the state in which the compressed portions 55 are distributed in the topsheet 2 with the portion IV in FIG. 1 as an example. In each figure, (a) is a partial plan view of the surface sheet 2, and (b) is a view showing cut surfaces along the ff line, gg line, and hh line in each surface sheet 2. It is. In addition, a plurality of imaginary lines j extending in the vertical direction in (a) indicates the position of the top of the raised portion 34. The portion between the adjacent virtual lines j and j corresponds to the valley portion 36 formed by the bottom portion 34a of the raised portion 34. In the 1st surface sheet 2a of (b), the 2nd surface sheet 2b has joined to the part. In the pressing part 55, the 1st pressing part 55a in the state by which the 1st surface sheet 2a and the 2nd surface sheet 2b were compressed, and the 2nd pressing part 55b in the state by which only the 1st surface sheet 2a was compressed. There is. In many 1st pressing site | parts 55a and 2nd pressing site | part 55b, what is formed in the peripheral part of the top part of the protuberance part 34, or the top part is contained. In addition to acting to change the first surface sheet 2a or the first surface sheet 2a and the second surface sheet 2b to one having a small thickness, the compressed portions 55 are arranged adjacent to each other. The squeezing portion 55 of the knives also works to change its thickness to a thin one. As a result, the 1st surface sheet 2a and the 2nd surface sheet 2b change so that a density may become high in the part in which the pressing site | part 55 is formed, and its peripheral part.

  In FIG. 4 (a), the plurality of intermittently formed compressed portions 55 draw a line 131 having an upward slope and a line 132 having an upward slope arranged at almost equal intervals. Distributed. The lines 131 and 132 intersect with each other and also with the line j. In the front-rear direction A, it is preferable that the squeezed portion 55 is formed so as to appear periodically at the top of the ridge 34 or the peripheral portion of the top so as to form a high-density portion in the ridge 34.

  Also in FIG. 5 (a), the plurality of compressed portions 55 delineate lines 131 and 132, but the interval between the compressed portions 55 on these lines is slightly different from the interval in FIG. 4 (b). .

  In FIG. 6A, the plurality of compressed portions 55 are arranged so as to draw a ring 133.

  In this invention, the pressing part 55 can be formed by allowing the sheet material to be the top sheet 2 to pass between a pair of embossing rolls. One of the pair of rolls uses a flat peripheral surface, and the other uses a roll in which a plurality of pins corresponding to the compressed portion 55 are formed on the peripheral surface. The pair of rolls or the pins of one roll are heated to such an extent that the thermoplastic synthetic fibers forming the sheet material to be the first topsheet 2a can be fused together. Although the planar shape of the pressing part 55 can be prescribed | regulated by the front-end | tip shape of a pin, in this invention, there is no special provision in the shape. However, it is preferable that the diameter as the pressing part 55 exists in the range of 0.3-3 mm. In addition, when the compressed parts 55 are lined up like lines 131 and 132, the distance between the adjacent compressed parts 55, that is, the gap between the compressed parts 55 and 55 is 0.3-5 mm. It is preferable that it exists in the range.

FIG. 7 is a partial perspective view of the sheet 101 as a raw fabric for obtaining the first top sheet 2a. The sheet 101 is preferably formed of a thermoplastic synthetic fiber 52a having a fineness of 1-5 dtex and a fiber length of 20-70 mm, and has a mass per unit area of 15-40 g / m ² . The sheet 101 may also be a thermal bond nonwoven fabric in which it is heat treated and the fibers 52a are fused together. The sheet 101 in the figure has a first direction L, a second direction M, and a third direction corresponding to the front-rear direction A, the lateral direction B, and the thickness direction C of the diaper 1. The upper surface 101a of the sheet 101 is a portion that becomes the contact surface 56 of the first surface sheet 2a, and the lower surface 101b is a portion that becomes the non-contact surface 57 of the first surface sheet 2a. On the upper surface 101a, a raised portion 34 and a skirt portion 34a are formed, and a valley portion 36 is formed by the skirt portions 34a facing each other in the second direction M. In the sheet 101, the dimension k from the lower surface 101b to the top of the raised portion 34 is in the range of 0.7-3 mm, and the minimum dimension m from the lower surface 101b to the bottom of the valley portion 36 is in the range of 0.1-1 mm. is there. The dimension m is smaller than the dimension k, and the difference between the two dimensions k and m is preferably at least 0.3 mm. For the dimension 10 mm in the second direction M of the sheet 101, it is preferable that 2-5 ridges 34 are formed. The thermoplastic synthetic fiber 52a is hydrophilized. However, when the sheet 101 is used not only as the first surface sheet 2a but also as the side sheet 5 in FIG. 1, the sheet 101 in the portion used as the side sheet 5 is subjected to a hydrophilic treatment. It is preferably used as a non-hydrophobic one or a hydrophobic one that has been subjected to a water repellent treatment. In the present invention, when the fiber is subjected to a hydrophilic treatment, it means that the fiber is subjected to a hydrophilic treatment as a sheet such as a fiber or a nonwoven fabric formed of the fiber. The fiber 52a preferably has a fineness of 1-6 dtex and a fiber length of 20-60 mm.

  An example of the manufacturing method of the sheet | seat 101 used as the 1st surface sheet 2a of the diaper 1 is as follows. First, steam, heated air, or columnar water flow from a plurality of nozzles arranged at a required pitch in a direction intersecting the machine direction while running a card web of uniform thickness formed of the thermoplastic synthetic fiber 52a in the machine direction. Are sprayed onto one side of the card web. The card web is placed on a breathable or water-permeable belt and travels in the machine direction together with the belt. The pitch of the nozzles is matched with the pitch of the valleys 36 in the sheet 101. In the card web, the thermoplastic synthetic fiber 52a moves in the crossing direction immediately below the nozzle, whereby a low-density valley portion 36 is formed, and a high-density raised portion 34 is formed between adjacent nozzles. Thus, the sheet 101 is obtained. As the thermoplastic synthetic fiber 52a, fibers such as polyethylene, nylon, and polyester, composite fibers of polyethylene and nylon, composite fibers of polyethylene and polyester, and the like are used. The composite fiber is preferably of a core-sheath type, but may be of a parallel type. These fibers 52a are preferably those having a fineness of 1-6 dtex and a fiber length of 20-60 mm. Further, the fibers 52a can be used in combination with different finenesses. The sheet 101 thus obtained forms a pressing portion 55 after a sheet to be the second surface sheet 2b is joined to the sheet 101 via a hot melt adhesive.

Examples of the second surface sheet 2b joined to the first surface sheet 2a include thermoplastic synthetic fibers such as polyethylene, nylon, and polyester, composite fibers of polyethylene and polyester, and composite fibers of polyethylene and polyester. It is used to hydrophilize the formed nonwoven fabric. The non-woven fabric is also an air-through non-woven fabric and is preferably stable in formation. It is preferable that the 2nd surface sheet 2b has the mass per unit area of 15-40 g / m < ² >, and the thickness under the mass of 3 g / cm < ² > exists in the range of 0.1-0.6 mm.

  FIG. 8 is a view showing a cut surface similar to FIG. 2 showing an example of the embodiment of the present invention. In the diaper 1 of FIG. 8, a well-known and conventional leak-proof wall 80 is formed at both side edges 11 of the crotch region 6. The breakwater 80 is a film made of thermoplastic synthetic resin, a nonwoven fabric, or the like, and is formed of a sheet piece that is substantially liquid impermeable. In the example of illustration, it forms by extending the side seat | sheet 5 in FIG. An elastic member 86 that extends in the front-rear direction A is attached to the inner edge 81 of the breakwater 80 so that it can be expanded and contracted.

  Such a breakwater 80 is in a state of lying on the top sheet 2 in FIG. 8, but when the diaper 1 is worn and curved in the front-rear direction A, the elastic member 86 contracts and is indicated by an imaginary line. As shown, the inner edge 81 stands up from the top sheet 2 toward the wearer's skin (not shown) and stops the flow of body fluid in the lateral direction B to prevent side leakage of body fluid in the crotch region 6. Can do.

  The diaper 1 illustrated so far has been an open type, but the present invention can also be implemented with a pant type diaper. The core material of the pants-type diaper matches the requirements in the present invention with the shape and structure when the core material is extended in a flat shape by cutting both sides of the diaper.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Surface sheet 2a 1st surface sheet 2b 2nd surface sheet 3 Back surface sheet 4 Core material 4a Perimeter 34 Raised part 34a Sole part 36 Valley part 52 Inner part (center part, middle part)
53 Outer part (both sides)
55 pressing part 55a 1st pressing part 55b 2nd pressing part 56 contact surface 57 non-contact surface A front-back direction B lateral direction C thickness direction

Claims (7)

A disposable diaper in which a bodily fluid absorbent core material is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet,
The core member has a front-rear direction, a lateral direction, and a thickness direction orthogonal to each other in a state where the core member is extended in a planar shape, and the front-rear direction and the lateral direction are the front-rear direction in the diaper. Match the horizontal direction,
The top sheet is a first top sheet extending from a peripheral edge of the core material in the front-rear direction and the horizontal direction, and the core material and the first top sheet are inside the peripheral edge in the horizontal direction. And a second surface sheet joined to the first surface sheet, and the first and second surface sheets are formed of a thermoplastic synthetic fiber subjected to a hydrophilic treatment. ,
The first surface sheet has a contact surface with respect to the skin of the wearer of the diaper and a non-contact surface that is the opposite surface, and the contact surface extends in parallel to each other in the front-rear direction. Ridges are formed, and the ridges adjacent to each other in the lateral direction are connected to each other at the bottom portion extending in the lateral direction, and the non-contact surface is formed flat.
Each of the second surface sheet is formed flat on both sides of the non-contact surface and the core material,
In the second surface sheet, an inner portion located in the center in the lateral direction is joined to the first surface sheet via a hot melt adhesive, and is located on both sides outside the inner portion in the lateral direction. The disposable diaper characterized in that an outer portion is joined to the first surface sheet at a plurality of first pressing portions in a state where the outer portion is compressed together with the first surface sheet. The disposable diaper according to claim 1, wherein a plurality of second pressing portions are formed on the first surface sheet of a portion located outside the second surface sheet in the lateral direction. 3. The disposable diaper according to claim 2 , wherein in the front-rear direction, the second pressing portion is formed on a portion of the first surface sheet that is located outside the second surface sheet. The disposable diaper according to claim 2 or 3 , wherein the first and second compressed parts include those formed on the top of the raised portion. As for the said 2nd surface sheet, the both ends in the said front-back direction are inside the said periphery, and the said 1st pressing site | part in the state by which the said 2nd surface sheet was squeezed with the said 1st surface sheet in the said both ends part The disposable diaper according to any one of claims 1 to 4 , wherein a plurality of intermediate portions formed between the both end portions in the front-rear direction are joined to the first surface sheet via the hot melt adhesive. . In the first surface sheet, the dimension from the non-contact surface to the top of the raised portion is in a range of 0.7-3 mm, and the bottom of the valley portion formed by the bottom portions facing each other in the lateral direction and the non-side The disposable diaper according to any one of claims 1 to 5 , wherein a dimension between the contact surface and the contact surface is smaller than the dimension within a range of 0.1-1 mm, and a difference between the two dimensions is at least 0.3 mm. The disposable diaper according to any one of claims 1 to 6 , wherein the number of ridges of the raised portion formed per 1 cm in the lateral direction of the first surface sheet is in the range of 2-5.

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