JPH05137752A - Absorptive article and its production - Google Patents

Abstract

PURPOSE:To prevent the liquid leakage of a physiological napkin, etc., by using a three-dimensional perforated sheet formed with numerous recessed parts as a surface sheet and applying an adhesive only at the front ends of the recessed parts in dotty or linear application patterns of a prescribed angle with the axial line parallel with the longitudinal direction of absorptive articled. CONSTITUTION:This absorptive article is constituted of the liquid permeable surface sheet 2, a liquid leakage-proof sheet 3 and an absorbent 4. The surface sheet 2 is formed of a polyolefin film, etc., as the three-dimensional perforated sheet formed with the numerous recessed parts 5. The adhesive 6 is applied only at the front ends 5a of the recessed parts 5 and the top ends are bonded to the absorbent 4. The application patterns of the adhesive 6 are formed to the shapes disposed in the dotty or linear shapes at <=60 deg. angle with the axial line N parallel with the longitudinal direction of the absorptive article 1. The movement of the liquid is smoothed by this constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as sanitary napkins, diapers, pads for incontinence, and breast milk sheets, and more particularly, to prevent the surface sheet and the absorbent body from being peeled off even when wet. The present invention relates to a fixed absorbent article and a manufacturing method thereof.

[0002]

2. Description of the Related Art In general, absorbent articles such as sanitary napkins and disposable diapers include an absorber that absorbs liquid such as blood and urine, a surface sheet that covers the surface of the absorber, and a surface sheet that is applied to the skin. A leak-proof sheet that covers the back surface and prevents liquid leakage is configured. The surface sheet of an absorbent article is required to have a liquid absorption / permeation mechanism for promptly transferring a liquid such as blood or urine to the absorbent body and absorbing the liquid in the absorbent body. The movement of the liquid from the surface sheet to the absorber is achieved by intimate contact between the two, and when they are in a separated state, the movement of the liquid from the surface sheet to the absorber is extremely high. , Causing liquid diffusion and liquid retention in the surface sheet,
This causes liquid leakage.

The liquid absorption failure caused by the separation of the surface sheet and the absorber as described above is a film type surface sheet (perforated film, net, etc.) which has no absorbability by itself.
This is a particular problem in the case of the three-dimensional perforated sheet, and the separation of the top sheet and the absorber is a fatal problem for the absorbent article. From such a point of view, various techniques have been proposed for preventing separation of the absorbent body and the topsheet, particularly in an absorbent article using a film-type three-dimensional apertured sheet.

For example, in JP-A-57-1339 and JP-A-60-259261, fibers for liquid suction are integrated with a surface sheet via an adhesive, and liquid from the surface sheet to the absorber is A technique for smoothing movement is disclosed.

[0005]

However, as the technique disclosed in the above publication, it is possible to eliminate the disadvantages caused by the fact that the three-dimensional perforated sheet itself does not have absorbency, but the disjointed fibers Since only the surface sheet is attached to the surface sheet, only a part of the fibers integrated with the surface sheet easily peels from the absorbent body, and essentially, the surface sheet and the absorbent body cannot be integrated at all. There is a problem in that the portion adhered to the sheet inhibits the liquid transfer from the surface sheet to the absorber in that portion, promotes the liquid retention and liquid diffusion in the surface sheet, and causes liquid leakage.

Therefore, an object of the present invention is to provide an absorbent article capable of preventing liquid leakage by smoothly moving the liquid from the surface sheet to the absorbent body, and a manufacturing method thereof.

[0007]

The present invention provides an absorbent article having a liquid-permeable surface sheet, a liquid-tight leak-proof sheet, and an absorber positioned between the two sheets. The sheet is a three-dimensionally perforated sheet in which innumerable recesses are formed, and is adhered to the absorber by an adhesive applied only to the tip of the recesses, and the application pattern of the adhesive is that of an absorbent article. 60 ° to the axis parallel to the longitudinal direction
The above object is achieved by providing an absorbent article characterized by being arranged in dots or lines at the following angles.

Further, the present invention provides a method for suitably manufacturing the absorbent article, in which a gravure having an adhesive applied to the peripheral surface is provided with a gap corresponding to the amount of depression of the surface sheet having the innumerable depressions formed therein. Arrange the roll and the support roll,
The surface sheet is supplied between the supporting roll and the gravure roll, and the peripheral surface of the gravure roll is brought into contact only with the tip of the recess of the surface sheet, whereby the adhesive is applied to the tip of the recess. A method for manufacturing an absorbent article, which comprises a step of applying only an absorbent body to the lower surface of the surface sheet and then adhering the absorbent body to the surface sheet via the adhesive. Is also provided.

[0009]

The body fluid on the side of the topsheet moves from the topsheet to the absorber. At this time, the topsheet and the absorber are adhered to each other only with the adhesive, so that the topsheet is removed from the topsheet. The fluid transfer to the absorbent body is not hindered, and the body fluid smoothly moves to the absorbent body.

During mounting of the absorber, the topsheet and the absorber are partially bonded only at the tip of the recess, and the adhesive application pattern is 60 ° or less with respect to the axis parallel to the longitudinal direction. Since the absorbent article has such an angle, the flexibility in the width direction of the absorbent article is not impaired, the fitting property to the body is improved, and no discomfort is felt.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to FIGS. 1 to 7 of the accompanying drawings. FIG. 1 is a perspective view of a sanitary napkin according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a bonded state of a topsheet according to an embodiment of the present invention, and FIG. 3 is a topsheet adhesion according to another embodiment of the present invention. Sectional view showing a state, FIG. 4 is a plan view showing an adhesive application pattern, FIG. 5 is a plan view showing another adhesive application pattern, and FIG. 6 is a process diagram showing a method for manufacturing an absorbent article of the present invention. 7
FIG. 3 is a perspective view of a gravure roll used in the manufacturing method of the present invention.

A sanitary napkin 1 as an absorbent article according to this embodiment comprises a liquid-permeable topsheet 2, a liquid-leakage-proof leakproof sheet 3, and an absorbent body 4 located between these sheets.
In the absorbent article having the above, the topsheet 2 is
A three-dimensional sheet having perforations formed with innumerable recesses 5, which is adhered to the absorber 4 by an adhesive 6 applied only to the tip 5a of the recesses 5, and the application pattern of the adhesive 6 is absorbed. 60 ° to the axis N parallel to the longitudinal direction of the elastic article
It is characterized by being arranged in a dot shape or a line shape at the following angles.

The topsheet 2 is made of a liquid impermeable material, and is preferably opaque in order to impart a shielding property to the absorbed liquid, and a resin film is used as the liquid impermeable material. However, a laminate of a resin film and a fiber layer may be used. Examples of such resin films include polyolefins, copolymer resins of olefins and other monomers, synthetic fibers, and blend polymers thereof. A so-called non-woven fabric or paper in which fibers are fixed by entanglement or adhesion is used for the fiber layer.

Further, the surface sheet 2 is a three-dimensionally perforated sheet in which innumerable recesses 5 are formed, and each recess 5 has a top (or surface) 5c as shown in an enlarged view in FIG. 4 a and a tip portion (or a bottom portion) 5 a protruding to the 4 side and a wall portion 5
and a through hole 8 is formed in the wall portion 5b of the recess 5. In this way, the through hole 8 has the wall portion 5b.
By being formed in, the blood and the like absorbed in the absorber can be shielded.

The tip 5a is coated with the adhesive 6. However, the adhesive 6 does not have to be coated on the entire surface of one tip 5a, and may be coated on a part of the tip 5a. Good. Further, it is not necessary to apply it to all of the innumerable recesses 5, but it is sufficient that it is applied to the tip 5a of the corresponding recess according to a predetermined dot-shaped or linear application pattern. The adhesive application pattern is set such that the angle α formed by the longitudinal axis N of the sanitary napkin 1 and the adhesive application line M is 60 ° or less. The angle α is set to 60 ° or less because if α is larger than 60 °, flexibility in the width direction is impeded. The angle α is preferably 20 ° to 50 °.

As the adhesive, a hot melt adhesive, a styrene / butadiene copolymer; for example, P-618B (trade name: manufactured by Toyo Petrolite Co., Ltd.), HT-400ZB
(Brand name: Nitta Gelatin Co., Ltd.), MQ-916 (Brand name: Kanebo NSC Co., Ltd.), Acrylic ester copolymer; For example, Movinyl 810 (Brand name: Hoechst Synthesis Co., Ltd.), Vinyl acetate, ethylene / olefin copolymer, petroleum-based adhesive resin, cold glue, etc. are used.

The strength of the adhesive must be 5 g or more, and particularly preferably 10 g or more. This is because if it is less than 5 g, there are many cases where the surface material and the absorber peel off during use. The amount of adhesive applied is 0.1 g / gramm
It is preferably m ² to ²⁰ g / m ² . This is because if it is less than 0.1 g / m ² , sufficient adhesive strength cannot be obtained.
This is because if it is more than g / m ² , not only the absorption may be impaired but also the texture will be greatly impaired, which is not preferable.

The leak-proof sheet 3 is preferably made of poly-ami waterproof paper, film or the like which is widely used in ordinary absorbent articles, and also has moisture permeability to allow the vapor stretched by adding a filler to a thermoplastic resin. A liquid-impermeable sheet or a sheet having a feeling similar to that of underwear, for example, a composite material of a film and a non-woven fabric or a composite material of a film and a woven fabric is used.

As the absorbent body 4, a material mainly composed of defibrated pulp and a combination of a high-molecular absorbent polymer and absorbent paper can be preferably used, but it is not particularly limited. Next, a method for manufacturing the sanitary napkin (absorbent article) of this example will be described with reference to FIGS. 6 and 7. The method for manufacturing a sanitary napkin is such that the support roll 9a and the gravure roll 9b are arranged with a gap corresponding to the depth of the recesses of the surface sheet 2 in which numerous recesses 5 are formed, and the support roll 9a and the gravure roll are disposed. 9b, the surface sheet 2 is supplied, and the peripheral surface of the gravure roll 9b is brought into contact with only the tip 5a of the recess 5 of the surface sheet 2, so that the adhesive 6 is applied only to the tip 5a. Then, the method further comprises the step of aligning the absorber 4 on the lower surface of the topsheet 2 and adhering the absorber 4 to the topsheet 2 via the adhesive.

The above-mentioned method of applying the adhesive 6 is a so-called gravure roll coating method, in which the support roll 9a and the gravure roll 9b are arranged at a predetermined distance in the conveying path of the topsheet 2, and these rolls 9a are formed. , 9b, the top sheet 2 is conveyed with the tip 5a of the recess 5 facing downward.
The gravure roll 9b is soaked in an adhesive agent tank 11 whose peripheral surface is partially filled with an adhesive agent 6, contacts the tip end portion 5c of the concave portion 5 of the surface sheet 2, and the adhesive agent is applied to the tip end portion 5c. Is to be applied.

As shown in FIG. 7, the gravure roll 9b has a desired coating pattern formed on its coating surface (peripheral surface), and in this embodiment, a grid pattern is formed. Therefore, the coating pattern can be easily changed by replacing the gravure roll on which a predetermined pattern is formed. The surface sheet 2 coated with the adhesive is
The rolls 12a and 12b are aligned with and joined to the absorber 4. Then, the leak-proof sheet 3 is formed to manufacture the absorbent article 1.

The specific products of the present invention will be described below. (Example 1) A three-dimensional perforated sheet made of a laminated nonwoven fabric having a weight of 45 g / m ² and having pores as shown in FIG. 2 was used as a surface material, and 0.3 g on a pulp having a weight of 260 g / m ² as an absorber. The super-absorbent polymer of No. 1 was sprinkled and wrapped with an absorbent paper having a weight of 18 g / m ² was used. Moreover, as the waterproof film, a polylaminated waterproof paper having a basis weight of 29 g / m ² was used. For the adhesion between the surface material and the absorber, Topco P-618B (Toyo Petrolite) was used as an adhesive, and a gravure roll coater applied a coating amount of 3 g / m ² , FIG.
The application pattern C (α = 50 °) shown in FIG. 1 was used to form a sanitary napkin having the configuration shown in FIG. (Embodiment 2) In the above Embodiment 1, Nitite HT-400ZB (manufactured by Nitta Gelatin Co., Ltd.) was used as an adhesive, and the coating amount was 10 g / m ² , and the coating pattern D (α) shown in FIG.
= 20 °) and other settings were made in the same manner as in Example 1 to obtain Example 2. (Example 3) Example 3 was obtained by using the coating pattern A (α = 0 °) shown in FIG. 5 in Example 1 and setting the same as in Example 1 except for the above. (Practical product 4) A practical product 4 was obtained in the same manner as in the practical product 1 except that a three-dimensional sheet having holes shown in FIG. (Comparative Product 1) In Comparative Product 1, Comparative Example 1 was obtained by setting the coating pattern shown in FIG. 8 to E (α = 90 °) and otherwise setting it in the same manner as in Comparative Product 2. (Comparative product 2) In Comparative product 2, a spiral spray was used as a means for adhering the surface material and the absorber, and a comparative product 2 was obtained in which an adhesive was applied to the entire surface to be adhered to the absorber by spray coating. (Comparative Product 3) A sample was prepared in Example 1 without any adhesive bonding, and was designated as Comparative Product 3.

The following comparative tests were carried out on the above-mentioned embodied product and the comparative product. (1) Measurement of adhesive strength A test piece to which the surface sheet and the absorbent sheet are adhered is 25 m long.
Cut out into a size of m (width) × 70 mm (length) and use this as a test sample. The test sample was peeled by a Tensilon tensile tester with a 30 mm gap between chucks (the sample was peeled off by 20 mm at the longitudinal end, and then the surface sheet and the absorption sheet were held between the chucks.) A 180 ° peel test under a pulling speed of 300 mm / min. The peeling speed obtained at this time is defined as the adhesive force. (Measurement of liquid absorption time) The test sanitary napkins as shown in FIG. 1, which were obtained as a product and a comparative product, were placed horizontally, and an acrylic plate with an inlet having a diameter of 10 mm was placed on the test product. Adjust so that a load of 5 g / cm ² is applied to the sanitary napkin of. 6 g of defibrinated horse blood (manufactured by Japan Biotest Institute Co., Ltd.) is injected from the inlet, and the absorption time until the liquid is completely absorbed is determined. (Handle test) With respect to the test sanitary napkins obtained as the implemented products and the comparative products, 20 monitors performed a hand touch test, and the feel was judged according to the following criteria.

○: Soft and soft to the touch. B: It feels a little hard, but it is relatively soft to the touch. X: The surface is hard and the texture is bad. (Measurement of Dynamic Absorption Amount) As shown in FIG. 8, the movable female waist model 20 was fitted with the sample 21 obtained in the example and the comparative example, and in the walking state (100 steps / minute), the injection tube 22 was used. The suspected blood was injected, and the amount of liquid absorbed by the sample 21 was measured until the leak occurred from the movable female lumbar model 20, and the amount was determined as the dynamic absorption amount. Also, at this time, it was confirmed whether or not peeling had occurred with respect to the adhesion state between the surface material and the absorber.

The results are shown in Table 1 below.

[0026]

[Table 1] As is clear from Table 1, the product of the present embodiment has an effect of exhibiting stable liquid absorbency without impairing the texture during use as compared with the comparative product. The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the scope of the present invention.

For example, the concave portion 5 formed in the topsheet 2
As shown in FIG. 3, the front end portion 5a may be opened. In this case, the tip 5a is the edge of the open end, and the adhesive 6 is placed on the edge 5a of the open end. In addition, as shown in FIGS. 5A and 5B, the application pattern of the adhesive on the surface sheet 2 has an intersection angle α of about 0.
That is, they may be arranged linearly or in points along the axis N, or may be arranged linearly in a grid pattern as shown in FIG. 5C.

[0028]

According to the absorbent article of the present invention, liquid can be prevented from leaking by smoothly moving the liquid from the surface sheet to the absorbent body. In particular, since the adhesive is applied only to the tip of the concave portion of the surface sheet, it does not hinder the transfer of body fluid from the surface sheet to the absorbent body and does not impair the flexibility of the entire absorbent article.

Further, when the coating pattern is 60 ° or less with respect to the longitudinal axis, a flexible axis is easily generated in the longitudinal direction, and the separation of the surface sheet and the absorber can be sufficiently suppressed. .. Further, according to the method for manufacturing an absorbent article according to the present invention, the absorbent article can be preferably manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view of a sanitary napkin according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a bonded state of a topsheet according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a bonded state of a topsheet according to another embodiment of the present invention.

FIG. 4 is a plan view showing an adhesive application pattern.

FIG. 5 is a plan view showing another adhesive application pattern.

FIG. 6 is a process drawing showing the method for manufacturing an absorbent article of the present invention.

FIG. 7 is a perspective view of a gravure roll used in the manufacturing method of the present invention.

FIG. 8 is a plan view showing an adhesive application pattern of a comparative product.

FIG. 9 is a perspective view showing a method for measuring a dynamic absorption amount.

[Explanation of reference numerals] 1 sanitary napkin (absorbent article) 2 surface sheet 3 leak-proof sheet 5 recess 5a tip 6 adhesive

Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B32B 7/02 7188-4F // B32B 3/24 Z 6617-4F 2119-3B A41B 13/02 S 7603-4C A61F 13/18 331

Claims (4)

[Claims] 1. An absorbent article having a liquid-permeable surface sheet, a liquid-leakage-proof leak-proof sheet, and an absorbent body located between these sheets, wherein the surface sheet is formed with innumerable recesses. Is a three-dimensional sheet having a hole and is adhered to the absorbent body with an adhesive applied only to the tip of the recess, and the application pattern of the adhesive is with respect to the axis parallel to the longitudinal direction of the absorbent article. The absorbent article is characterized by being arranged in a dot shape or a linear shape at an angle of 60 ° or less. 2. The absorbent article according to claim 1, wherein the adhesive strength of the surface sheet to the absorbent body by the adhesive is 5 g or more. 3. An opening is formed in at least a part of the concave portion of the surface sheet.
The absorbent article described. 4. A gravure roll having an adhesive applied to its peripheral surface and a support roll are arranged with a gap corresponding to the amount of depression of the surface sheet on which the innumerable recesses are formed, and the support roll and the gravure roll. And the surface sheet is supplied between, and by contacting the peripheral surface of the gravure roll only to the tip of the recess of the surface sheet, the adhesive is applied only to the tip of the recess, then A method for manufacturing an absorbent article, comprising a step of aligning an absorber on the lower surface of the topsheet and adhering the absorber to the topsheet via the adhesive.