JP2006175689A - Three-dimensional sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional sheet excellent in liquid flow preventing properties, cushioning properties, the touch and the like, capable of obtaining sufficient joining strength in a heat fusion part and also excellent in liquid permeability. <P>SOLUTION: The three-dimensional sheet 10 is constituted so that a first sheet 1 and a second sheet 2, both of which are laminated mutually, are partially fused thermally to form the heat fusion part 4 and the first sheet 1 is protruded at a part other than the heat fusion part 4 to form a large number of protruded parts 5. The heat fusion part 4 has a shape long in one direction (Y-direction) of the plane direction of the three-dimensional sheet 10 and a large number of opening 41 are formed to the heat fusion part 4 so as to leave intervals in the longitudinal direction of the heat fusion part 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a three-dimensional sheet preferably used for a surface sheet of an absorbent article such as a disposable diaper, a sanitary napkin, a panty liner (corimono sheet), and an incontinence pad.

As a surface sheet of an absorbent article such as a disposable diaper or a sanitary napkin, there is known one having irregularities formed on a surface that comes into contact with a wearer's skin.
According to the surface sheet having unevenness, the contact area with the wearer's skin is reduced due to the presence of the unevenness, so that it is possible to reduce stickiness and stuffiness. In particular, a sheet composed of two laminated sheets and having a concavo-convex shape formed by one of the sheets is excellent in a cushion feeling and the like. For example, the applicant of the present invention has joined the upper layer and the lower layer, which are laminated to each other, to form a joint, and the upper layer protrudes toward the wearer's skin at a portion other than the joint, and has a large number of protrusions. The surface sheet in which the part was formed was proposed (refer to patent documents 1).

JP 2004-174234 A

The surface sheet according to Patent Document 1 is excellent in liquid flow prevention, cushioning, and the like. However, depending on the bonding state of the upper layer and the lower layer in the bonding portion, the bonding portion becomes liquid-impermeable, and thus on the bonding portion. The remaining liquid may cause stuffiness or adhesion to the skin.
Moreover, after the surface sheet of the literature 1 inserts one sheet into the meshing part of a pair of concavo-convex rolls to form the concavo-convex shape, the other sheet is brought into close contact with the peripheral surface of the one concavo-convex roll. It can be manufactured by transporting to the joint with the sheet and pressurizing and heating both sheets between the uneven roll and other rolls. When the height is increased, there is a fear that sufficient bonding strength cannot be obtained at the heat-sealed portion.

  An object of the present invention is to provide a three-dimensional sheet that is excellent in liquid flow prevention property, cushioning property, touch, and the like, has sufficient bonding strength in a heat-sealing portion, and is excellent in liquid permeability. The three-dimensional sheet of the present invention is particularly suitable for a surface sheet of an absorbent article, but is not limited thereto, an intermediate sheet of the absorbent article, a three-dimensional gathering sheet or absorber, a cleaning sheet, a decorative sheet, a packing material, and the like Can also be used.

  In the present invention, the first sheet and the second sheet laminated to each other are partially heat-sealed to form a heat-sealing portion, and the first sheet protrudes at a portion other than the heat-sealing portion and has a large number of A three-dimensional sheet forming a convex portion, wherein the heat-sealing portion has a shape that is long in one direction in the plane direction of the three-dimensional sheet, and a plurality of openings are formed in the longitudinal direction of the heat-sealing portion. The object is achieved by providing a three-dimensional sheet having holes formed at intervals.

  The three-dimensional sheet of the present invention is excellent in liquid flow preventing property, cushioning property, touch and the like, and further excellent in liquid drawability, and is particularly preferably used as a surface sheet for absorbent articles.

The present invention will be described below based on preferred embodiments with reference to the drawings.
FIG. 1 shows a three-dimensional sheet 10 as an embodiment of the present invention. The three-dimensional sheet 10 shown in FIG. 1 is a surface sheet for absorbent articles, and is used for skin contact surfaces of absorbent articles such as disposable diapers, sanitary napkins, panty liners (orimono sheets), and incontinence pads. It is.
The three-dimensional sheet 10 includes a first non-woven fabric (first sheet) 1 and a second non-woven fabric (second sheet) 2 laminated together. When the three-dimensional sheet 10 is used as the top sheet of the absorbent article, the first nonwoven fabric 1 forms a surface (skin contact surface) that is directed to the wearer's skin when worn, and the second nonwoven fabric 2 is worn. A surface (non-skin contact surface) that is sometimes directed to the absorber side is formed.

  The 1st nonwoven fabric 1 and the 2nd nonwoven fabric 2 are partially heat-sealed, and, thereby, many heat-fusion parts 4 are formed. The 1st nonwoven fabric 1 protrudes in the direction opposite to the 2nd nonwoven fabric 2 side in parts other than the heat-fusion part 4, and forms many convex parts 5 of an internal cavity. The convex part 5 protrudes in the direction which goes to a wearer's skin, when the solid sheet 10 is used as a surface sheet of an absorbent article.

The convex portions 5 and the heat fusion portions 4 are arranged alternately and in a line in one direction parallel to the surface of the three-dimensional sheet 10 (X direction in FIG. 1, hereinafter referred to as the X direction). Such rows are formed in multiple rows in a direction parallel to the surface of the three-dimensional sheet 10 and perpendicular to the one direction (the Y direction in FIG. 1, hereinafter referred to as the Y direction).
The convex portions 5 and the heat fusion portions 4 in the rows adjacent to each other are each shifted in the X direction, and more specifically, are shifted by a half pitch.
The convex part 5 is discontinuous in both the X direction and the Y direction.

  In addition, the X direction in the three-dimensional sheet 10 of this embodiment corresponds to the flow direction in the manufacturing process of the three-dimensional sheet 10, and the length of the absorbent article when the three-dimensional sheet 10 is incorporated into the absorbent article as a surface sheet. It coincides with the direction or the direction orthogonal thereto. Further, the X direction in the three-dimensional sheet 10 also coincides with the fiber orientation directions in the first and second nonwoven fabrics. Further, when viewed as a whole, the three-dimensional sheet 10 has a substantially flat surface on the second nonwoven fabric 2 side, and has large unevenness on the first nonwoven fabric 1 side.

  As shown in FIG. 2, the heat-sealing portion 4 in the three-dimensional sheet 10 has a substantially rectangular plan view shape that is long in the Y direction, and a plurality of (three) openings are provided in the longitudinal direction. 41 is formed at intervals. The opening 41 penetrates the heat fusion part 4 in the thickness direction. When the heat-bonding part 4 heats and pressurizes the laminated first nonwoven fabric and second nonwoven fabric partially and heat-fuses them, the heat-fusibility derived from the constituent fibers of the first and / or second nonwoven fabrics. The component is formed by melting and solidifying. The portions 42 and 43 except for the opening 41 portion in the heat-sealing portion 4 may be in a state where the constituent fibers of the first and second nonwoven fabrics can be visually observed in the fibrous form, but the three-dimensional sheet of the present embodiment In 10, the constituent fibers of the first and second nonwoven fabrics are melted or buried in the melted resin, and the fibrous form cannot be visually observed. That is, the heat sealing | fusion part 4 is in the state made into the external appearance film. The portions 42 and 43 excluding the opening 41 portion in the heat-sealing portion 4 are liquid-impermeable, and the upper and lower surfaces are smooth.

  The openings 41 arranged in the longitudinal direction (Y direction) of the heat-sealing portion 4 have a distance W (see FIG. 2) between the openings 41 such that the length D in the longitudinal direction of the heat-sealing portion 4 (see FIG. 2). 10) to 40%, particularly 15 to 30%, and numerically speaking, 0.3 to 2 mm, particularly 0.5 to 1 mm is preferable. Moreover, it is preferable that the plurality of apertures 41 are widely dispersed in the longitudinal direction without being biased toward one end in the longitudinal direction of the heat-sealing portion 4. The plurality of apertures formed in the heat-sealed portion 4 are provided on both sides of a center line (in this embodiment, a center line extending in the X direction) that bisects the longitudinal direction of the heat-sealed portion 4. It is preferable to form it substantially symmetrically.

  Next, the manufacturing method of the three-dimensional sheet 10 of this embodiment is demonstrated, referring FIGS. As shown in FIG. 4, the first nonwoven fabric 1 is fed out from the raw fabric 1 ′ of the first nonwoven fabric 1. Separately, the second nonwoven fabric 2 is fed out from the raw fabric 2 'of the second nonwoven fabric 2. A first roll 11 having a concavo-convex shape on the peripheral surface, and a second roll 12 having a concavo-convex shape meshing with the concavo-convex shape of the first roll on the peripheral surface. The first nonwoven fabric 1 is unevenly shaped by being bitten by the meshing portion.

  FIG. 5 shows an enlarged view of a main part of the first roll 11. The first roll 11 is formed by combining a plurality of spur gears 11a, 11b,... Having a predetermined tooth width into a roll shape. The tooth width of each gear determines the dimension in the Y direction of the convex portion 5 of the topsheet 1. Adjacent gears are combined such that the pitch of their teeth is shifted by half a pitch. As a result, the peripheral surface of the first roll 11 has an uneven shape.

  A suction hole 13 is formed in the tooth groove portion of each gear in the first roll 11. The tooth groove portion corresponds to a concave portion of the concave and convex shape on the peripheral surface of the first roll 11. The suction hole 13 communicates with a suction source (not shown) such as a blower or a vacuum pump, and extends from a meshing portion between the first roll and the second roll to a joining portion between the first nonwoven fabric 1 and the second nonwoven fabric 2. It is controlled so that suction is performed between them. Accordingly, the first nonwoven fabric 1 formed with irregularities by the meshing of the first roll and the second roll is in close contact with the first roll peripheral surface by the suction force by the suction holes 13, and the irregularities are shaped. Is retained. In this case, as shown in FIG. 5, if a predetermined gap G is provided between adjacent gears, the first nonwoven fabric 1 is not subjected to excessive stretching force or cutting effect due to uneven engagement of the rolls. 1 is brought into close contact with the peripheral surface of the first roll 11.

  At the tip of each gear tooth of the first roll 11, a step is provided between the planar shoulder portion 11 and a convex portion 11 d for forming the opening 41 is formed. The convex part 11d has a slight step between the shoulder part 11c. The convex portion 11d melts the resin and moves the resin to form the opening 41, and the shoulder portion 11 forms portions 42 and 43 other than the opening 41 portion in the heat fusion portion 4. Is. The height of the step is, for example, about 50 to 200 μm.

  Then, the second nonwoven fabric 2 is overlapped in a state where the first nonwoven fabric 1 is continuously sucked and held on the peripheral surface of the first roll 11, and the overlapped one is the first roll 11 and the peripheral surface smooth anvil. A pressure is applied between the roll 15. At this time, both the first roll 11 and the anvil roll 15 or only the anvil roll 15 are heated to a predetermined temperature. Thereby, the 1st nonwoven fabric 1 and the 2nd nonwoven fabric 2 which are located on the convex part in the 1st roll 11, ie, on the tooth | gear of each gear, are joined by thermal fusion, and the thermal fusion part 4 is formed. .

  In this embodiment, as shown to Fig.6 (a), in the 1st nonwoven fabric 1 and the 2nd nonwoven fabric 2, the convex part 11d for the said hole 41 formation of the 1st roll 11, and the surrounding surface of the anvil roll 15 The portion sandwiched between the two becomes a hole 41 when the resin of the constituent fibers is melted by heat and the molten resin moves around the portion, particularly in the front-rear direction. On the other hand, as shown in FIG. 6A and FIG. 6B, between the shoulder portion 11 c of the first roll 11 and the peripheral surface of the anvil roll 15 in the first nonwoven fabric and the second nonwoven fabric 2. The portions sandwiched between the portions are slightly melted by heat, but the resin does not move from the portions, and these resins are then solidified, whereby the portions 42 and 43 other than the opening 41 portion of the heat-sealed portion 4. Is formed.

In the method of the present embodiment, the first and second nonwoven fabrics used for heat-sealing have a large tension in the flow direction of the first and second nonwoven fabrics generated by forming the first nonwoven fabric 1 with irregularities. However, since a plurality of convex portions 11d for forming holes are formed at intervals in the longitudinal direction of the tip portion of the teeth of the first roll 11, the region P [ In FIG. 7 (a)], the tension is relaxed, and in the region P, the amount of heat applied to both nonwoven fabrics is smaller than the portion pressed by the convex portion 11d. Therefore, the first nonwoven fabric 1 and the second nonwoven fabric 2 are firmly heat-sealed. On the other hand, in the portion pressed by the convex portion 11d of the first roll 11, the tension generated in the flow direction of the first and second nonwoven fabrics is not relatively relaxed, and the amount of heat applied is large. As the resin melts, it moves around it, particularly back and forth. Thereby, the opening 41 is reliably formed.
FIG. 7B is a view showing the first roll 11 where the above-mentioned convex portion 11d is not formed in the longitudinal direction of the tip of the tooth. In this case, in the flow direction, FIG. Cutting is likely to occur at the front and rear edge portions 11f.

According to the three-dimensional sheet 10 of the present embodiment, when used as a top sheet of an absorbent article, the convex portion 5 provides good cushioning properties and feel, and the convex portion 5 and the heat-sealed portion 4 are formed. Due to the unevenness, excellent liquid flow preventing property can be obtained, and for example, liquid such as soft stool and menstrual blood can be prevented from flowing and spreading on the sheet. Further, the liquid excreted or reached on the heat fusion part 4 is absorbed by the absorber through the path leading to the absorber by absorbing liquid from the rising part of the convex part 5 having a high fiber density and the opening 41. By the route, it can be smoothly transferred to the absorber.
Therefore, the absorbent article using the three-dimensional sheet 10 is less likely to leak from any of the wearer's front, back, left and right directions, and the appearance after use is relatively clean.
Further, the three-dimensional sheet 10 is excellent in flexibility in the surface direction, and flexibly bends in both the X direction and the Y direction, so that the fit with the wearer is improved, and the article or part where flexibility is required. Can also be used.

  Furthermore, since the plurality of apertures 41 are formed at intervals in the longitudinal direction of the heat-sealed portion 4, the liquid permeability from the convex portion 5 to the aperture is excellent.

Moreover, according to embodiment mentioned above, as above-mentioned, it is hard to produce a cut | disconnection in the boundary part of the heat-fusion part 4 and other parts, and also in parts other than the opening 41 of the heat-fusion part 4. The hole 41 is excellent in formability while ensuring sufficient bonding strength.
Therefore, the convex part 5 can be formed stably and the solid sheet 10 excellent in liquid flow prevention property, cushioning property, touch, etc. can be obtained easily.

From the viewpoint of ensuring that the above-described effects are more reliably exhibited, the topsheet 10 preferably has the following configuration.
The height H (see FIG. 1) of the convex portion 5 is preferably 1 to 10 mm, particularly preferably 3 to 6 mm. The number of convex portions 5 per unit area (1 cm ² ) of the three-dimensional sheet 10 is preferably 1 to 20, particularly 6 to 10.

The bottom dimension A (see FIG. 1) of the convex portion 5 in the X direction is preferably 0.5 to 5.0 mm, particularly preferably 1.0 to 4.0 mm. The bottom dimension B (see FIG. 1) of the convex part 5 in the Y direction is 1.0 to 10 mm, particularly preferably 2.0 to 7.0 mm.
The ratio of the bottom dimension A in the X direction to the bottom dimension B in the Y direction (bottom dimension A: bottom dimension B) is preferably 1: 1 to 1:10, particularly 1: 2 to 2: 5. The bottom area (bottom dimension A × bottom dimension B) of the convex portion 5 is preferably 0.5 to 50 mm ² , particularly preferably ² to 20 mm ² .

The heat-sealed portion 4 preferably has a dimension C in the X direction (see FIG. 1) of 0.5 to 2 mm, particularly 0.8 to 1.5 mm, and a dimension D in the Y direction (see FIG. 2) of 1. It is preferable that it is 0.0-5.0 mm, especially 1.2-3.0 mm. The ratio of the dimension C in the X direction to the dimension D in the Y direction (dimension C: dimension D) is preferably 1: 1 to 1: 3, particularly 2: 3 to 2: 5. The area (dimension C × dimension D) of the heat fusion part 4 is preferably 0.5 to 10 mm ² , particularly preferably 0.8 to ⁶ mm ² .

The area of each opening 41 is preferably 0.2 to ⁵ mm ² , particularly preferably 0.5 to 1.5 mm ² , and the total area (a plurality of openings 41 per one heat-sealing part 4 exists). In this case, the total area of the holes) is preferably 1 to 5 mm ² , and the ratio of the total area to the area of the heat fusion part 4 ([total area / heat fusion part area] × 100) is 20 It is preferable that it is -70%.

  Although the shape of the heat-sealing part 4 is a bowl shape (rectangular corner is curve-processed) in the embodiment, it may be a bowl-like shape in which the X direction or the Y direction center part is expanded or a narrow shape. In this case, the above-described dimension C in the X direction and dimension D in the Y direction are measured at the maximum portion. Although other ridge-like rectangles can be used, from the viewpoint of the convex formability of the three-dimensional sheet, the ridge-like shape is preferable, and the shape inflated in the X direction and narrowed in the Y direction has a good hole opening property and heat-bonding portion strength. It is more preferable than the point.

As the first and second nonwoven fabrics, various known nonwoven fabrics can be used. For example, various nonwoven fabrics manufactured by the card method, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunlace nonwoven fabrics, heat roll nonwoven fabrics, needle punched nonwoven fabrics, etc. Nonwoven fabrics can be used. As the second sheet, a fiber web that is not made into a non-woven fabric can be used. In the three-dimensional sheet 10 of the present embodiment, a nonwoven fabric that does not substantially expand and contract is used as the first and second nonwoven fabrics.
As the first non-woven fabric, from the viewpoint of the touch when used as a top sheet, an air-through non-woven fabric, a heat embossed non-woven fabric, an air laid fabric in which fiber fusion points are formed on a fiber web obtained by a card method or the like by an air-through method. Nonwoven fabrics, spunbonded nonwoven fabrics and the like are particularly preferably used. As a 2nd nonwoven fabric, the heat roll nonwoven fabric which formed the heat-fusion point of fibers with the heat roll method on the fiber web obtained by the card | curd method etc. from the viewpoint of absorbing and maintaining the shape of a convex part and absorptivity In particular, a sheet with less elongation compared to the upper layer such as heat embossed nonwoven fabric, spunbond nonwoven fabric, melt blown nonwoven fabric, and spunlace nonwoven fabric is preferably used.

  Next, a three-dimensional sheet 10 ′ as another embodiment of the present invention will be described with reference to FIGS. 8 and 9. Regarding the three-dimensional sheet 10 ′, the points different from the three-dimensional sheet 10 described above are mainly described, and the same points are denoted by the same reference numerals and the description thereof is omitted. For the points that are not particularly mentioned, the above description regarding the three-dimensional sheet 10 is applied as appropriate.

  Short fibers are filled in the convex portions 5 of the three-dimensional sheet 10 ′. The short fibers form a fiber assembly 3. The fiber assembly 3 made of short fibers is disposed between the first nonwoven fabric 1 and the second nonwoven fabric 2 in the convex portion (portion having the convex portion 5) in the three-dimensional sheet 10 ′, and is in close contact with both nonwoven fabrics. is doing.

In the heat fusion part 4, the short fiber which comprises the fiber assembly 3 does not exist substantially. The reason that “substantially does not exist” is that even in the manufacturing process of the three-dimensional sheet 10 ′, even if the short fibers are arranged only on the convex portions, a small amount of short fibers are formed in the heat-sealed portion. In consideration of the fact that it is often arranged, the purpose is to allow the presence of such a small amount of short fibers. However, the ratio (percentage) of the short fiber amount per unit area of the heat-sealed portion to the short fiber amount per unit area of the convex portion is 20% by weight or less, preferably 5% by weight or less.
The fiber density in each convex portion of the three-dimensional sheet 10 ′ increases in the order of the first nonwoven fabric 1, the short fibers (short fibers as the fiber assembly 3), and the second nonwoven fabric 2. By imparting such a fiber density gradient to the convex portion, excretory fluid such as urine and menstrual blood can be smoothly transferred from the surface of the convex portion 5 to the fiber assembly 3, and then the second nonwoven fabric can be smoothly smoothed. 2 can be transferred.

  Further, since the short fibers constituting the fiber assembly 3 are not substantially present in the heat-sealed portion 4, various fibers can be used without considering the heat-fusibility in the heat-fused portion. It can be used as a short fiber constituting the aggregate 3.

As short fibers (short fibers filled in the convex portions 5) constituting the fiber assembly 3, for example, the following are preferably used.
(1) Fibers that are inferior in heat-fusibility than the constituent fibers of the first and second nonwoven fabrics (hereinafter also referred to as non-heat-fusible fibers).
By using the non-heat-bondable fiber, the movement of the fiber freely corresponds to the pressure change during use, and the cushion feeling of the three-dimensional sheet 10 is enhanced.

The fiber that is inferior in heat fusibility to the constituent fibers of the first (second) non-woven fabric is, for example, a fiber that does not melt at a temperature lower than the melting point of the heat-fusible resin constituting the constituent fibers of the first (second) non-woven fabric. Say. For example, when the first and second non-woven fabrics are made of fibers mainly composed of polyethylene resin, as the short fibers constituting the fiber assembly, polyethylene terephthalate (PET), polypropylene (PP), nylon having a higher melting point. It is preferable to use a fiber made of a synthetic resin such as polyamide, or a semi-natural fiber that has been adjusted for hydrophilicity, such as acetate rayon. Further, when the first and second nonwoven fabrics are made of fibers mainly composed of viscose rayon, acetated rayon, and pulp, cotton fibers, rayon fibers, etc. are used as the short fibers constituting the fiber assembly. Is preferred.
The non-heat-bondable fiber preferably has a thickness of 0.5 to 6.6 dtex, particularly 1.1 to 3.3 dtex, and a basis weight of 5 to 50 g / m ² , particularly 10 to 30 g / m ^2. It is preferable that

(2) Latent crimpable fiber By using the latent crimpable fiber, the convex portion 5 has a desired property by heat treatment in the production step of the three-dimensional sheet 10 or in the step of producing an absorbent article using the three-dimensional sheet 10. Can be granted. For example, a short fiber / second non-woven fabric with excellent liquid drawability can be obtained by forming a convex portion having a high degree of crimping and forming an elastic recovery force against compression or a fiber structure having a small capillary diameter. Can be formed.

  The latent crimpable fiber is a fiber having a property that a helical three-dimensional crimp is developed and contracted by heating. In the present specification, both those that have developed a helical crimp and those that have been developed are referred to as latent crimpable fibers. The latent crimpable fiber includes, for example, an eccentric core-sheath type or concentric core-sheath type composite fiber or a side-by-side type composite fiber composed of two components having different shrinkage rates. Examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331. Two types of components (thermoplastic polymers, etc.) with different shrinkage rates include ethylene-propylene random copolymer (high shrinkage rate component) and polypropylene (low shrinkage rate component), polyethylene terephthalate (PET, low shrinkage rate) Component), a combination of polyethylene terephthalate and isophthalic acid (CoPET, high shrinkage component) is a preferred example.

  The amount of the fiber (1) or (2) in the fiber assembly 3 can be, for example, 50 to 100%, particularly 80 to 100% by weight with respect to the weight of the fiber assembly 3. Examples of the fiber to be included together with the latent crimpable fiber include those exemplified as the fiber of (1) above.

  The fibers constituting the fiber assembly 3 (fibers filling the convex portions 5) are short fibers, that is, the average fiber length is 100 mm or less.

The three-dimensional sheet 10 ′ can be manufactured, for example, by the process shown in FIG.
That is, in the same manner as the above-described manufacturing method of the three-dimensional sheet 10, the first nonwoven fabric 1 that has been concavo-convexly shaped by the meshing of the first roll 11 and the second roll 12 is applied to the first non-woven fabric 1 by the suction force of the suction holes 13. Adheres closely to the roll circumference. Next, the short fibers 31 are supplied in a scattered state by the known fiber supply means 14 to the peripheral surface of the first roll 11 in a state where the first nonwoven fabric 1 is in close contact. The short fibers 31 are conveyed toward the peripheral surface of the first roll 11 along the air flow generated in the duct 14 a covering a part of the first roll 11, and are sucked from the suction holes 13 to It is selectively deposited in the recess of the roll 11. The air flow in the duct 14a can be generated by suction from the suction hole 13 and / or other blowing means (not shown).

  And as shown in FIG. 9, the 2nd nonwoven fabric 2 was piled up in the state which sucked and held the 1st nonwoven fabric 1 and the accumulated short fiber 31 on the surrounding surface of the 1st roll 11, and the piled up. A thing is partially heated and pressurized between the convex part of the 1st roll 11, and the anvil roll 15, and the 1st nonwoven fabric 1 and the 2nd nonwoven fabric 2 are heat-sealed. In this way, the three-dimensional sheet 10 'can be manufactured. The points that are not particularly described are the same as in the method for manufacturing the three-dimensional sheet 10 described above.

  The three-dimensional sheet 10, 10 'described above is suitably used as a surface sheet for absorbent articles such as disposable diapers, sanitary napkins, panty liners, incontinence pads, and the like.

Moreover, it can also be used for uses other than the surface sheet of an absorbent article.
For example, as a sheet for absorbent articles, it can be used as a sheet disposed between a top sheet and an absorbent body, a sheet for forming a three-dimensional gather (leakage barrier) (particularly a sheet for forming the inner wall of a gather), and the like. Moreover, as an application other than the absorbent article, it can be used as a cleaning sheet, particularly a cleaning sheet mainly for liquid absorption, a personal use decorative sheet, and the like. When using it for a cleaning sheet, in a convex part, since followability to a to-be-cleaned surface which is not smooth is good, it is preferred to use the 1st nonwoven fabric side toward a to-be-cleaned surface. When used as a decorative sheet, it can follow the skin of the subject at the convex part, express a massage effect, and can absorb excess cosmetic (used separately) and sweat, so the first nonwoven fabric side can be It is preferable to use it toward the side.

As mentioned above, although embodiment of the three-dimensional sheet | seat of this invention was described, this invention is not restrict | limited to said embodiment at all and can be changed suitably. For example, in the above embodiment, three holes are provided in each heat-sealing part 4, but two or four or more holes may be formed. Moreover, you may mix regularly the heat sealing | fusion part which formed two openings, and the heat sealing | fusion part which formed three openings.
Moreover, although the convex part 5 of the three-dimensional sheet | seat 10 and 10 'was a quadrangular frustum shape, hemispherical things etc. may be sufficient. In addition, the degree to which the convex portions 5 and the heat fusion portions 4 in the adjacent rows are displaced in the X direction may be 1/3 pitch, 1/4 pitch, or the like, instead of 1/2 pitch. Further, it does not have to be shifted in the X direction.

  Moreover, in the three-dimensional sheet | seat 10 and 10 'mentioned above, although the nonwoven fabric was used as a material of a 1st sheet | seat or a 2nd sheet | seat, the film in which the hole is not given or the film in which the hole was given can also be used. . These films can be used for the first sheet and the second sheet, respectively, and either sheet may be a nonwoven fabric or a web. From the viewpoint of the touch, in the case of a film, it is preferable that embossing is performed so as to give a cloth-like feel.

  Further, in the above-described three-dimensional sheet 10, 10 ′, in the heat-sealed portion 4 excluding the opening 41 portion, the fibrous form cannot be visually observed, that is, the appearance-like film is formed. If it is liquid impermeable or poorly permeable, a partially or wholly fibrous form may be observed.

  In addition to the elliptical shape, the shape of the opening in plan view may be a circle, an oval, a polygon with rounded corners (a square, a rectangle, a triangle, a diamond, or the like). Some examples are shown in FIG.

It is a perspective view which expands and shows the principal part of one Embodiment of the solid sheet of this invention. It is an enlarged plan view which expands and shows one heat-fusion part and the vicinity of the three-dimensional sheet | seat shown in FIG. It is sectional drawing of a heat sealing | fusion part and its vicinity, (a) is the II-II sectional view taken on the line of FIG. 2, (b) is the III-III sectional view taken on the line of FIG. It is a schematic diagram which shows the method of manufacturing the solid sheet shown in FIG. It is a principal part enlarged view of the 1st roll in FIG. It is a figure which shows a mode that a heat-fusion part is formed. FIG. 7 (a) is a view showing the tip of the first roll tooth, and FIG. 7 (b) is obtained by removing the convex part for opening formation from that of FIG. 7 (a). FIG. It is a perspective view which expands and shows the principal part of other embodiment of the solid sheet of this invention. It is a schematic diagram which shows the method of manufacturing the solid sheet shown in FIG. It is a top view which expands and shows the principal part of other embodiment of the three-dimensional sheet | seat of this invention.

Explanation of symbols

10, 10 'solid sheet 1 first nonwoven fabric (first sheet)
2 Second nonwoven fabric (second sheet)
DESCRIPTION OF SYMBOLS 3 Fiber assembly which consists of short fiber 4 Heat-sealing part 41 Opening 42,43 The part except an opening part 5 Convex part

Claims (5)

The first sheet and the second sheet laminated to each other are partially heat-sealed to form a heat-sealing portion, and the first sheet protrudes at a portion other than the heat-sealing portion to form a large number of convex portions. A three-dimensional sheet
The heat-sealed part has a shape that is long in one direction in the planar direction of the three-dimensional sheet, and a plurality of holes are formed at intervals in the longitudinal direction of the heat-fused part.   The three-dimensional sheet according to claim 1, wherein the opening has a shape that is long in a width direction of the heat-sealing portion.   The three-dimensional sheet according to claim 1 or 2, wherein the convex portions are filled with short fibers.   The three-dimensional sheet according to claim 3, wherein the short fibers are substantially not present in the heat fusion part. The first sheet and the second sheet laminated together are partially heat-sealed to form a heat-sealed portion, and the first sheet protrudes at portions other than the heat-sealed portion to form a large number of convex portions. Made of three-dimensional sheet,
The heat fusion part has a shape that is long in one direction in the plane direction of the three-dimensional sheet, and a plurality of holes are formed at intervals in the longitudinal direction of the heat fusion part. A surface sheet of an absorbent article used with the sheet side facing the skin side.