JP6265329B2 - Absorbent article and manufacturing method thereof - Google Patents

Description

  The present invention relates to an absorbent article and a method for producing the same.

  The absorbent article is configured by interposing an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet. The absorbent body is formed, for example, by mixing wood pulp fibers and the like with a superabsorbent resin. And the pressing groove which reaches an absorber is formed in the surface of a top sheet by embossing, and, thereby, improves the shape retention nature of an absorber, the diffusion of liquid, and the absorption speed of liquid (patent documents) 1).

  However, when liquid such as urine is absorbed in the absorber, the strength of the absorber is reduced, and the absorber is broken and broken by the movement of the wearer, and the shape of the absorber collapses. It was.

  In addition, as a technique relevant to this invention, the following patent documents 2 and 3 are mentioned, for example. Patent Document 1 describes an absorbent article including an absorbent body mainly composed of pulp fibers impregnated with a water-soluble binder and a superabsorbent resin (SAP). Moreover, patent document 2 has the description of the absorbent article which covered the circumference | surroundings of the absorptive core with the shape-retaining sheet | seat of the nonwoven fabric.

  These absorbent articles do not contribute to the improvement of the shape retention and absorption speed of the absorber, respectively.

JP 2007-75407 A JP-A-6-315502 JP 2004-337386 A

  This invention is made | formed in view of such a situation, The objective is the absorbent article which can hold | maintain the shape of a pressing groove, even if it absorbs a liquid, and can avoid shape loss of an absorber, and its manufacturing method Is to provide.

The present invention is grasped by the following composition.
(1) The absorbent article of the present invention is an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber between the top sheet and the back sheet, A pressing groove is formed from the skin contact surface of the top sheet to the absorber, and an adhesive is formed on the upper and lower portions of the absorber corresponding to the area of the pressing groove.

(2) The absorbent article of the present invention has an upper and lower two-layer structure in which the absorber is at least partially overlapped with the upper layer and the lower layer in the configuration of (1), and the upper layer and the lower layer are bonded to each other. It is characterized by being.

(3) The absorbent article of the present invention is characterized in that, in the configuration of either (1) or (2), the compressed groove has a depth of 60% to 95% with respect to the thickness. To do.

(4) The absorbent article of the present invention includes a liquid diffusable sheet between the top sheet and the adhesive formed on the absorber in any one of the constitutions (1) to (3). It is characterized by that.

(5) In the absorbent article of the present invention, in any one of the constitutions (1) to (4), the adhesive is applied and formed in a substantially similar shape according to the shape of the compressed groove in a plan view. It is characterized by that.

(6) The method for manufacturing an absorbent article according to the present invention is a method for manufacturing an absorbent article having any one of the constitutions (1) to (5), wherein the top sheet corresponding to the area of the compressed groove Applying the adhesive to the absorber-side surface and the absorber-side surface of the back sheet; bonding the top sheet to the absorber and the back sheet; and a skin contact surface of the top sheet And embossing the absorbent body to form the compressed groove.

(7) The method for manufacturing an absorbent article according to the present invention is a method for manufacturing an absorbent article having the configuration of (4), wherein the absorbent-side surface of the liquid-diffusible sheet corresponding to the compressed groove region and Applying the adhesive to the absorber-side surface of the back sheet, attaching the top sheet, the absorber, the liquid diffusable sheet, and the back sheet, and skin contact of the top sheet And embossing from the surface to the absorber to form the compressed groove.

  According to such an absorbent article and its manufacturing method, even if it absorbs a liquid, the shape of a pressing groove can be hold | maintained and it becomes possible to avoid the shape-losing of an absorber.

It is a top view which shows Embodiment 1 of the absorbent article of this invention. It is sectional drawing in the AA of FIG. It is the top view which showed the area | region which applies an adhesive agent (a 1st adhesive agent, a 2nd adhesive agent). (A) thru | or (d) is process drawing which shows one Example of the manufacturing method of the absorbent article of this invention. (A) thru | or (c) is explanatory drawing which shows other embodiment in formation of a pressing groove, respectively. It is sectional drawing which shows other embodiment of the absorbent article of this invention. It is a top view which shows other embodiment of the absorbent article of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter, embodiments) will be described in detail with reference to the accompanying drawings. Note that the same number is assigned to the same element throughout the description of the embodiment.
(Embodiment 1)
FIG. 1 is a plan view showing Embodiment 1 of the absorbent article of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.

  1 and 2, for example, an incontinence pad will be described as an example, but other absorbent articles such as an incontinence liner, a sanitary napkin, and a paper diaper may be used.

  In the following description, the longitudinal direction of the absorbent article (the y direction in the figure) is the direction across the wearer when the absorbent article is worn, and the width direction of the absorbent article (the x direction in the figure). ) Is a direction transverse or orthogonal to the longitudinal direction.

  1 and 2, the absorbent article 10 is formed by laminating a liquid permeable top sheet 20, a liquid diffusable sheet 30, an absorbent body 40, and a liquid impermeable back sheet 50 from the side in contact with the skin. It consists of a body. Thereby, the liquid diffusable sheet 30 and the absorber 40 have a structure enclosed by the top sheet 20 and the back sheet 50.

  As shown in FIG. 1, the absorbent body 40 has a belt-like shape extending in the longitudinal direction of the absorbent article 10. For example, the absorbent body 40 has an arc shape protruding outward at both ends in the longitudinal direction, Both sides have an arc shape that protrudes inward. However, the shape of the absorber 40 is not limited to this. The absorbent body 40 is made of a mat-like member obtained by mixing pulverized wood pulp fibers, heat-fusible fibers, and the like with a super absorbent polymer (SAP). The absorber 40 has, for example, an upper and lower two-layer structure of an upper layer absorber 40A and a lower layer absorber 40B. In this case, the upper-layer absorber 40A and the lower-layer absorber 40B have the same size in FIGS. 1 and 2, but are not limited to this, and are partially overlapped with different sizes. You may make it laminate | stack. The upper absorbent body 40A and the lower absorbent body 40B are formed in a state of being wrapped with, for example, a hydrophilic nonwoven fabric or a wood fiber sheet, although not shown.

  The liquid diffusable sheet 30 is bonded to the upper surface of the absorbent body 40 on the top sheet 20 side via a first adhesive 60. As shown in FIG. 2, the liquid diffusive sheet 30 is formed to have a substantially similar shape with a slightly larger area than the absorber 40. The liquid diffusive sheet 30 is not shown in FIG. The liquid diffusive sheet 30 is made of a relatively thick hydrophilic non-woven fabric, and transports and diffuses, for example, the liquid (for example, urine) dripped and introduced through the top sheet 20 described later in detail in the longitudinal direction. , To reduce liquid return.

  Here, the first adhesive 60 is made of, for example, a hot melt adhesive. And the 1st adhesive agent 60 is the surface of the absorber 40, as shown in the area | region of the dotted line frame of FIG. 1, Comprising: The rectangular shape extended in the direction which cross | intersects this longitudinal direction at the both ends of the longitudinal direction In addition, the rectangular regions A3 and A4 extending in the longitudinal direction of the absorber 40 on both sides of a center line (indicated by O in the drawing) passing through the center of the width of the absorber 40 in the regions A1 and A2 of the absorber 40. Is formed inside. Each of these areas A1, A2, A3, and A4 is an area where a compressed groove 90 to be described later is formed.

  FIG. 3 is a view showing that the first adhesive 60 is applied and formed in each of the regions A1, A2, A3, and A4.

  Returning to FIG. 2, the absorber 40 is bonded to the back sheet 50 via the second adhesive 70 on the surface opposite to the liquid diffusable sheet 30. The second adhesive 70 is made of, for example, a hot melt adhesive.

  As shown in FIG. 1, the back sheet 50 is formed to have a substantially similar shape with a larger area than the absorber 40 (and the liquid diffusable sheet 30). As described above, the backsheet 50 is liquid-impermeable and has a waterproof function so that liquid such as urine absorbed by the absorber 40 does not leak into the underwear. As a material of such a back sheet 50, for example, a thin plastic film such as polyethylene is used.

  Here, the 2nd adhesive agent 70 is formed in the part which overlaps with the area | region where the 1st adhesive agent 60 was apply | coated in planar view. That is, each corresponding 2nd adhesive agent 70 is formed so that it may overlap with each of the area | region A1, A2, A3, A4 of the dotted-line frame of FIG. .

  Further, the top sheet 20 is arranged so as to face the back sheet 50 with the absorbent body 40 and the liquid diffusable sheet 30 in between. The top sheet 20 is formed to have substantially the same size as the back sheet 50, for example. However, it is not limited to this, and may be formed smaller than the back sheet 50. Since the top sheet 20 is a sheet that comes into contact with the skin, the top sheet 20 is preferably formed of a material such as a nonwoven fabric that has a soft feel and does not irritate the skin.

  The top sheet 20 includes the absorber 40 and the liquid diffusable sheet 30 together with the back sheet 50 by being integrally joined to the periphery of the back sheet 50 at the periphery thereof.

  The top sheet 20 is located on both sides of a center line (indicated by O in the drawing) passing through the center of the width thereof, and is adjacent to the periphery of the top sheet 20 (outside the regions C and D). A pair of three-dimensional gathers 80 extending in the longitudinal direction is formed. The three-dimensional gather 80 is a portion formed so that a part of the top sheet 20 can be erected, and can prevent, for example, side leakage of urine. The three-dimensional gather 80 may be formed by the back sheet 50 whose periphery is folded back to the top sheet 20 side, or may be formed by overlapping the top sheet 20 and the back sheet 50. The constituent members are appropriately bonded to each other with an adhesive or the like at adjacent portions.

And as shown in FIG. 1, the pressing groove | channel 90 is formed in the area | region A1, A2, A3, A4 to which the 1st adhesive agent 60 is apply | coated in planar view, as shown in FIG. Yes. The squeezing grooves 90 in the regions A1 and A2 are, for example, arcuate linear shapes that protrude outward (both ends of the top sheet 20), and the squeezing grooves 90 in the regions A3 and A4 are, for example, inside (the top sheet 20 It has a circular arc shape that is convex in the center. As shown in FIG. 2, the compressed groove 90 penetrates the first adhesive 60 from the surface (skin contact surface) of the top sheet 20, and reaches the absorber 40, for example, to a portion close to the second adhesive 70. It is supposed to be formed. In this case, as shown in FIG. 2, when the thickness of the absorbent article 10 is T, the depth T ₀ of the compressed groove 90 is set to a value of 60% or more and 95% or less with respect to the T. Is preferred. Of course, in such a range, the pressing groove 90 may be formed so as to reach the second adhesive 70, for example.

  4 (a) to 4 (d) are process diagrams showing an embodiment of a method for manufacturing the absorbent article 10 described above. First, as shown to Fig.4 (a), the liquid diffusable sheet 30 is prepared and the 1st adhesive agent 60 is apply | coated to the predetermined location of the side by which the absorber 40 of this liquid diffusable sheet 30 is arrange | positioned. On the other hand, as shown in FIG.4 (b), the back sheet 50 is prepared and the 2nd adhesive agent 70 is apply | coated to the predetermined location by the side of the absorber 40 of this back sheet 50 arrange | positioned.

  Next, as shown in FIG. 4C, an absorber 40 is prepared, and the absorber 40 is sandwiched between the liquid diffusable sheet 30 and the top sheet 20 from one side of the absorber 40. And the back sheet 50 is applied from the other side. Thereby, the liquid diffusable sheet 30 is bonded to the absorbent body 40 together with the first adhesive 60, and the back sheet 50 is bonded to the absorbent body 40 together with the second adhesive 70. Thereafter, the periphery of the top sheet 20 and the periphery of the back sheet 50 are joined, so that the liquid diffusable sheet 30 and the absorber 40 are enclosed by the top sheet 20 and the back sheet 50.

  And as shown in FIG.4 (d), the embossing is performed from the skin contact surface of the top sheet 20, and the pressing groove 90 is formed until it reaches the part adjacent to the 2nd adhesive agent 70 of the absorber 40, for example. To do.

Table 1 is a table | surface which shows the experimental result which showed the presence or absence of shape loss of the absorbent article 10 of this invention comprised as mentioned above with the comparative example.

As an absorbent article of the present invention (Example), 280 mm in length, width and form what the 110 mm, the topsheet is an air-through nonwoven fabric of 20 g / ^{m 2,} the backsheet 20 g / ^{m 2} breathable polyethylene The first adhesive 60 and the second adhesive 70 shown in FIGS. 1 and 2 are applied to an incontinence pad (hereinafter referred to as a pad) in which the amount of SAP in the absorber 40 is 6 g and the amount of fluff is 12 g. What applied and further formed the pressing groove 90 was prepared. In addition, as a comparative example, one that does not use the first adhesive 60 and the second adhesive 70 in the above-described configuration was prepared.

  As a test for the presence or absence of shape loss, first, 100 ml of 0.9% physiological saline was poured into the center of the pad and left for 1 minute. Thereafter, a 7 kg roll was placed on the pad, rolled over the entire surface, and reciprocated.

  In such a test, the number of reciprocations of the roll when the absorber 40 was broken was determined. And the reciprocation number of the roll when the pressing groove 90 disappeared was calculated | required. Such an operation is performed three times (N = 1 to 3), and the average value is shown in Table 1 above. However, if there is no loss of shape even after 10 reciprocations,> 10.

  From Table 1, it becomes clear that the absorbent article (Example) of the present invention is very excellent in the shape of the absorber 40 or the holding of the compressed groove 90.

(Embodiment 1)
In the first embodiment, the compressed groove 90 is formed in each of the regions A1, A2, A3, and A4 where the adhesive (the first adhesive 60 and the second adhesive 70) is applied, as shown in FIG. , Formed as one groove extending in the extending direction. However, the present invention is not limited to this, and it is of course possible to form a plurality of grooves or holes formed in a pattern with a relatively small area so as to be scattered in each of the regions A1, A2, A3, A4. is there. As the groove or hole pattern described above, for example, a linear pattern having a relatively short length as shown in FIG. 5 (a), a cross-shaped pattern as shown in FIG. 5 (b), FIG. A round pattern as shown in FIG.

(Embodiment 2)
In the second embodiment, the absorber 40 has an upper and lower two-layer structure in which the absorber 40A and the absorber 40B overlap with each other, and the absorber 40A and the absorber 40B are not bonded to each other as an example. Is. However, it is needless to say that the absorber 40A and the absorber 40B may be configured to be bonded to each other via the third adhesive 100 as shown in FIG. Also in this case, the third adhesive 100 is formed so as to overlap the first adhesive 60 and the second adhesive 70 in a plan view, and the compressed groove 90 formed from the skin contact surface of the top sheet 20 is the third. It is preferable to form the adhesive 100 so as to penetrate therethrough.

(Embodiment 3)
In the third embodiment, the application areas of the adhesive (the first adhesive 60 and the second adhesive 70) are all rectangular as shown in areas A1, A2, A3, and A4 in FIG. . However, it is not limited to this, and as shown in FIG. 7, it is needless to say that it may be applied in a substantially similar shape in accordance with the shape of the compressed groove 90 to be formed. In the configuration as shown in FIG. 1, when the compressed groove 90 has an arc shape, the areas A1, A2, A3, and A4 to which the adhesive (first adhesive 60 and second adhesive 70) is applied are more than necessary. In the case where there is an inconvenience if it is large, the inconvenience can be solved by performing as shown in FIG. Further, as shown in FIG. 6, even when the third adhesive 100 is applied between the absorbers 40A and 40B formed in the upper and lower two-layer structure, the shape of the application region is shown in FIG. You may make it do.

(Embodiment 4)
In the fourth embodiment, the liquid diffusable sheet 30 is incorporated in the top sheet 20 and the back sheet 50 together with the absorber 40. However, it goes without saying that the liquid diffusable sheet 30 may not be incorporated. In this case, the top sheet 20 is bonded to the absorber 40 by the first adhesive 60, and the compressed groove 90 formed from the skin contact surface of the top sheet 20 penetrates the first adhesive 60. Needless to say, it is formed as follows.

(Embodiment 5)
In the fifth embodiment, it is needless to say that the absorber 40 does not necessarily have a two-layer structure, and may be configured as a one-layer structure or a structure of three or more layers.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiments. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Absorbent article 20 Top sheet 30 Liquid diffusable sheet 40 Absorber 40A Absorber 40B Absorber 50 Back sheet 60 First adhesive 70 Second adhesive 80 Solid gather 90 Squeeze groove 100 Third adhesive

Claims (3)

A liquid-permeable topsheet;
A liquid-impermeable backsheet;
An absorbent article comprising an absorbent body between the top sheet and the back sheet,
A pressing groove is formed from the skin contact surface of the top sheet to the absorber,
The absorber has an upper and lower two-layer structure in which an upper layer and a lower layer are at least partially overlapped,
An adhesive is applied between the top sheet and the upper layer absorber, between the upper layer absorber and the lower layer absorber, and between the lower layer absorber and the back sheet, corresponding to the region of the compressed groove,
The adhesive is applied in a substantially similar shape in plan view according to the shape of the compressed groove,
Furthermore, the pressing groove penetrates the adhesive located between the top sheet and the upper layer absorber and the adhesive located between the upper layer absorber and the lower layer absorber from the skin contact surface of the top sheet. And it is formed so that the adhesive agent located between the said lower layer absorber and the said back sheet may be reached | attained. The absorbent article according to claim 1, characterized in that it comprises said topsheet, and an adhesive formed between the top sheet and the upper absorbent body, between the liquid-diffusive sheet. It is a manufacturing method of an absorptive article given in any 1 paragraph of Claim 1 or 2 ,
An adhesive is applied between the top sheet and the upper layer absorber, between the upper layer absorber and the lower layer absorber, and between the lower layer absorber and the back sheet , corresponding to the area of the compressed groove. Process,
Bonding the top sheet, the absorber and the back sheet;
And a step of embossing along the longitudinal direction from the skin contact surface of the top sheet to the absorber to form the compressed groove.

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