JP2002119540A - Absorptive article and manufacturing device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a pressed groove without tearing a surface sheet regardless of materials such as the thickness of an absorbent and the material of the surface sheet. SOLUTION: For this absorptive article 1, the absorbent 4 is interposed between a liquid permeable surface sheet 3 and a liquid non-permeable back surface sheet 2 and the pressed groove 7 is formed by linearly pressing the absorbent 4 together with the surface sheet 3 from the side of the liquid permeable surface sheet 3. The pressed groove 7 is formed of a pressing roll 9 for pressed groove formation provided with a projection part 10A for groove formation for which groove bottom high pressed parts 12 and groove bottom low pressed parts 13 with a height difference from the groove bottom high pressed parts 12 are alternately formed along a longitudinal direction at a tip surface part and side press parts 14 in a slope shape are formed to side wall surfaces including the groove bottom high pressed parts 12 and the groove bottom low pressed parts 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent article such as a sanitary napkin, a panty liner, a vaginal sheet, an incontinence pad and the like for absorbing menstrual blood and vaginal discharge, and an apparatus for producing the same.

[0002]

2. Description of the Related Art Conventionally, absorbent articles such as panty liners, sanitary napkins, vaginal sheets, incontinence pads and the like include liquid-impervious back sheets such as polyethylene sheets or polyethylene sheet-laminated non-woven fabrics, and non-woven fabrics or liquid-permeable back sheets. It is known that an absorbent made of cotton-like pulp or the like is interposed between a liquid-permeable surface sheet such as a permeable plastic sheet.

In such an absorbent article, a raised portion is partially formed to secure adhesion to a local portion, and the absorbent for preventing the absorber from being distorted and preventing lateral leakage. It has been practiced to squeeze the absorber together with the liquid surface sheet to form a compressed groove having an arbitrary linear pattern.

In order to form the compressed groove, a pressing roll heated to a predetermined temperature with a liquid-impermeable back sheet, an absorber and a liquid-permeable top sheet laminated in a manufacturing process of an absorbent article. It is formed by squeezing from the side of the liquid-permeable top sheet by the groove forming protrusions on the surface of the squeezing roll by passing between the anvil rolls.

[0005]

However, when the compressed grooves are formed by the groove-forming projections and are simply compressed by the convex groove-forming projections, the compression of the thickness of the absorber, the strength of the topsheet, and the like are not possible. Depending on the physical properties of the object and the squeezing conditions such as the pressure and temperature of the squeezing roll, a large tensile force and shear force may be applied to the liquid-permeable surface sheet, which may cause breakage.

In order to solve this problem, Japanese Patent Application Laid-Open No. 2000-14701 discloses that, as shown in FIG. There is disclosed a method of forming a shape including a low compression part 52, forming the bottom of the compression groove by the high pressure part 51, and forming the side wall part of the compression groove by the low compression part 52.

According to the present inventors, it is true that by forming the groove forming protrusions like the groove forming protrusions 50 described in Japanese Patent Application Laid-Open No. 2000-14701, the low compression portion 52 can be used as a stress buffering portion. It was found that tearing of the topsheet was reduced.

However, when the absorber thickness is relatively thick, such as a sanitary napkin for night use, or when the weight per unit area is small and the tensile strength or shear strength of the topsheet is low, the topsheet material is extremely difficult to stretch. In such a case, the top sheet may be torn again, and the countermeasures were not perfect.

SUMMARY OF THE INVENTION Accordingly, a main object of the present invention is to provide an absorbent article capable of forming a compressed groove without breaking the topsheet, regardless of the thickness of the absorber and the physical properties of the material of the topsheet, and an apparatus for manufacturing the same. To provide.

[0010]

According to a first aspect of the present invention, there is provided an absorbent article, wherein an absorbent is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. In the absorbent article in which a compressed groove is formed by linearly compressing the topsheet and the absorbent body from the liquid-permeable topsheet side, the compressed groove has a groove bottom high-pressure compressed portion at a front end surface thereof, While alternately forming the groove bottom high pressure parts and the groove bottom low pressure parts having a height difference along the longitudinal direction,
Pressed body for forming a compressed groove including a groove-formed protrusion formed with a side-pressed part having an inclined surface shape with respect to at least a side wall surface on the pressing-in approach side to the absorbent article including the groove-bottom high-pressure part and the groove-bottom low-pressure part. It is characterized by being formed by.

In the absorbent article according to the second aspect, an absorbent is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and the surface of the absorbent article is viewed from the liquid-permeable top sheet side. In the absorbent article in which the compressed groove is formed by linearly compressing the sheet and the absorber, the compressed groove is
A groove bottom high pressure squeezed part and a groove bottom high pressure squeezed part having a height difference with the groove bottom high pressure squeezed part are alternately formed along the longitudinal direction, and the groove bottom high pressure squeezed part and the groove bottom low squeezed part are formed. For forming a groove formed by forming an inclined surface side compressed portion with respect to at least the side wall surface on the pressing approach side to the absorbent article including the portion, and forming a step-shaped groove shoulder low compressed portion continuous with the side compressed portion. It is characterized by being formed by a compressed groove forming pressurizing body having a projection.

Next, a manufacturing apparatus according to a third aspect of the present invention provides the manufacturing apparatus according to the third aspect, wherein the absorbent article has an absorbent body interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. A manufacturing apparatus for forming a compressed groove by linearly pressing the topsheet and the absorber on the topsheet side, wherein the manufacturing apparatus includes a pressed roll for forming a compressed groove, and a pressing roll for forming the compressed groove. A press groove forming device comprising an anvil roll disposed adjacently in a vertical direction of a press roll, wherein the press roller for forming a press groove has a groove bottom high pressure press section at a tip end portion thereof, and a groove bottom high pressure press section. Along with the groove bottom low-squeezed portion having a height difference with the portion along the longitudinal direction, the groove bottom high-squeezed portion and the groove bottom low-squeezed portion at least for the absorbent article including the side wall surface on the pressing approach side for the absorbent article. Groove forming protrusions with side-squeezed portions formed on inclined surfaces It is characterized in further comprising a peripheral surface.

[0013] Further, the manufacturing apparatus according to the fourth aspect of the present invention is the manufacturing apparatus according to the above, wherein the absorbent article has an absorbent body interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. A manufacturing apparatus for forming a compressed groove by linearly pressing the topsheet and the absorber on the topsheet side,
The manufacturing apparatus is a compressed groove forming apparatus including a compressed groove forming pressure roll and an anvil roll disposed adjacent to the compressed groove forming pressure roll in the up-down direction, wherein the compressed groove forming pressure The roll has a groove bottom high pressure squeezing section on the tip surface,
The groove bottom high pressure part and the groove bottom low pressure part having a height difference are alternately formed along the longitudinal direction, and at least the pressing approach side to the absorbent article including the groove bottom high pressure part and the groove bottom low pressure part Forming a sloped side compressed portion with respect to the side wall surface, and comprising a groove forming projection formed on the peripheral surface to form a step-shaped groove shoulder low compressed portion continuous with the side compressed portion, Is what you do. In this case, the step-shaped groove shoulder low compression portion is formed by attaching a groove shoulder forming member, and the height difference from the groove bottom low compression portion can be made variable.

In the first to fifth aspects of the present invention, it is preferable that the angle of inclination of the side compressed portion is 15 to 60 °, and the width of the tip of the groove bottom high pressure portion is 1 to 5 mm. It is desirable that the height difference between the groove bottom high pressure portion and the groove bottom low pressure portion is 0.1 to 1.0 mm.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially exploded development view of a sanitary napkin 1 manufactured according to the present invention.
FIG. 2 is a view showing how to form the compressed groove 7.

[Sanitary napkin structure and manufacturing method thereof] The sanitary napkin 1 includes a liquid-impermeable back sheet 2 (hereinafter, simply referred to as a back sheet) made of a polyethylene sheet or the like, menstrual blood, vaginal discharge, and the like. A liquid-permeable topsheet 3 (hereinafter simply referred to as a topsheet) that allows quick permeation, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between these two sheets 2 and 3, and this absorbent body A crepe paper 5 surrounding the absorber 4 for maintaining the shape of the absorber 4 and improving the diffusivity; and side nonwoven fabrics 6 and 6 formed on both sides of the surface along the longitudinal direction, respectively. At the upper and lower edges of the outer sheet, the outer edges of the back sheet 2 and the top sheet 3 are joined by an adhesive such as hot melt or an adhesive means such as heat sealing. In both side edges and the back sheet 2 extend laterally than the absorbent body 4 and the side nonwoven fabric 6 are joined by adhesive means such as adhesive or heat sealing, such as a hot melt.

As the surface sheet 3, a perforated or non-perforated nonwoven fabric or a porous plastic sheet is preferably used. As a material fiber constituting the nonwoven fabric, for example, other than olefin-based such as polyethylene or polypropylene, polyester-based, and synthetic fibers such as polyamide-based,
Regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used.

On the top surface of the topsheet 3, a raised portion is formed partially to secure the adhesion to the local area, the absorber 4 is fixed to prevent skewing, and menstrual blood flowing down to the side is quickly absorbed. Compressed grooves 7, 7,.

As shown in FIG. 2, the compressed grooves 7, 7... Pass through the compressed groove forming device 8 in a state where the absorbent body 4 and the topsheet 3 are laminated in the process of manufacturing the sanitary napkin 1. It is molded by letting it do.

The compressed groove forming device 8 includes a groove forming protrusion 1.
A pressure roll 9 for forming a compression groove having 0, 10 on its peripheral surface;
An apparatus comprising an anvil roll 11 for receiving pressure, the sanitary napkin 1 is passed through a narrow space between the pressing groove forming pressure roll 9 and the anvil roll 11 so that the groove forming protrusion 10 is formed on the surface. The absorber 4 is squeezed together with the topsheet 3 from the sheet 3 side to form squeezed grooves 7, 7,. The temperature of the pressure roller 9 for forming the compressed groove is as follows:
Considering the melting point and pressing time of the topsheet 3, 50
It is desirably in the range of 200 to 200 ° C. Further, a hot melt adhesive is interposed between the topsheet 3 and the absorber 4, and when pressed under heating, the pressed shape is stabilized by the adhesive force of the hot melt adhesive, or the absorber 4 is pressed.
When heat fusible fibers are mixed therein and pressed under heating, the heat can promote the adhesion of the heat fusible fibers and stabilize the pressed shape.

In this embodiment, as an example of the shape of the compressed groove, a case where a total of four arc-shaped compressed grooves 7, 7... Are formed at the upper, lower, left and right positions is illustrated, but the linear pattern of the compressed groove 7 is arbitrary. For example, an arbitrary groove shape such as an oval shape, a gourd shape, or a composite shape can be provided.

[Shape of Groove Forming Protrusion 10] In the present invention,
In particular, regardless of the thickness of the absorber 4 or the physical properties of the material of the topsheet 3, the shape of the groove forming projections 10 is such that the compressed grooves 7 can be formed without causing breakage of the topsheet 3. Projection 1 according to the first embodiment shown in FIGS. 3 and 4
Either 0A or the protrusion shape 10B according to the second embodiment shown in FIGS. 7 and 8 is employed.

(Groove Forming Protrusion 10A According to First Aspect) First, the first protruding portion 10A has a groove bottom high pressure pressing portion 12 at the tip end surface and a height difference from the groove bottom high pressure pressing portion 12. And the groove bottom low compression parts 13 are formed alternately along the longitudinal direction, and the inclined plane is formed with respect to the side wall surface including the groove bottom high pressure parts 12, 12, ... and the groove bottom low compression parts 13, 13, .... Side pressing unit 1
Groove-forming projections 4 and 14 are formed. In the illustrated example, the planar shape of the groove bottom high-pressure part 12 and the groove bottom low-pressure part 13 is square, but may be any shape such as a parallelogram.

As shown in FIG. 5, the compressed groove 7 formed by the groove forming protrusion 10A has a relatively deep groove and a high density compressed part along the longitudinal direction of the groove bottom. 15 and the low-pressed portions 16 having a relatively shallow groove depth and a low density are alternately arranged, and the inclined surfaces 17, 17 in which the side walls of the pressed grooves 7 gradually become narrower as they go deeper, are formed. It becomes a groove shape. The reason why the high-pressure parts 15 and the low-pressure parts 16 are arranged alternately is to prevent the top sheet 3 from being lifted up (separated from the absorber 4) by the pressure bonding by the high-pressure parts 15 and to form the pressing grooves 7. This is because when menstrual blood or the like flows into the inside, it is quickly penetrated into the relatively high-density high-pressure squeezed portion 15 side and captured, thereby preventing diffusion to the surroundings.

According to the groove forming projection 10A, as shown in FIG. 6, when the compressed groove 7 is formed in the sanitary napkin 1, the side compressed portion 14 is formed in the sanitary napkin 1. Can smoothly enter the absorbent body 4 while gradually crushing the absorbent body 4 together with the topsheet 3, so that excessive tensile stress and shear stress locally do not act on the topsheet 3, and the topsheet 3 Breaking can be reliably prevented.

The inclination angle α of the side pressing portion 14 is 15 to 6
0 °, preferably 30 to 45 °. The inclination angle α is 1
If the angle is less than 5 °, the top end of the groove-forming projection 10A enters the topsheet 3 at an acute angle, so that the topsheet 3 may be broken. On the other hand, if the inclination angle α exceeds 60 °, excessive stress is generated in the surface sheet 3 at the groove side wall, which is not preferable.

The tip width B of the groove bottom high-pressure pressing portion 12
Is desirably 1 to 5 mm, preferably 2 to 3 mm. If the tip width B is less than 1 mm, the original purpose of the compressed groove 7 to fix and hold the absorbent body 4 will not be able to exhibit the function of preventing deformation and preventing diffusion of menstrual blood and the like. On the other hand, the tip width B
If it exceeds 5 mm, the absorber 4 will feel hard and the wearing feeling will be impaired.

The above-mentioned groove bottom high pressure squeezing section 12 and the groove bottom low pressure squeezing section 13
Is 0.1 to 1.0 mm, preferably 0.3 to 1.0 mm.
It is desirable to set it to 0.5 mm. When the height difference H is less than 0.1, the surface sheet 3 does not function as a pressing groove.
Is more likely to occur.

Although it is desirable for the balance to form the side squeezing portions 14 on both side walls, the side squeezing portions 14 may be formed only at least on the side walls on the squeezing approach side of the absorbent article.

(Groove Forming Protrusion 10B According to Second Aspect) Next, as shown in FIG. 7 and FIG. The groove bottom high pressure parts 12 and 12 and the groove bottom high pressure parts 13 and 13 are alternately formed along the longitudinal direction. Forming side squeezing portions 14, 14 having an inclined surface shape with respect to the side wall surface including ...
Further, it is a groove-forming projection in which stepped groove shoulder low compression parts 18 are formed continuously with the side compression part 14.

As shown in FIG. 9, the compressed groove 7 formed by the groove forming projection 10B has a relatively deep groove depth along the longitudinal direction of the groove bottom, and has a high density. 15 and low-pressing portions 16 having a relatively shallow groove depth and a low density are alternately arranged, and the inclined surfaces 17 and 17 are formed in which the side walls of the pressing grooves 7 gradually become narrower as they go deeper. At the same time, a groove shape is formed in which a stepped groove shoulder low compression portion 19 is formed in the upper edge portion of the compression groove 7 along the groove longitudinal direction.

According to the groove forming projection 10B, when the compressed groove 7 is formed on the sanitary napkin 1, the side compressed portion 14 and the groove shoulder low compressed portion 18 are formed on the sanitary napkin 1. The absorbent body 4 is smoothly squeezed together with the topsheet 3 while being gradually crushed, and the groove shoulder low-squeezed portion 19 formed in a stepped manner at the top edge of the groove serves as a stress buffer zone of the topsheet 3. Therefore, excessive tensile stress and shear stress are not locally applied to the topsheet 3, and the topsheet 3 can be reliably prevented from being broken.

The inclination angle α of the groove forming projection 10B, the tip width B of the groove bottom high pressure pressing part 12, and the height difference H between the groove bottom high pressure pressing part 12 and the groove bottom low pressing part 13 are respectively shown. The numerical range that can be taken is the same as that of the groove forming projection 10A, but the height difference J between the groove bottom low compression part 13 and the groove shoulder low compression part 18 is appropriately determined according to the thickness of the absorber 4. Although it will be selected, generally 0.1 to 0.1 with respect to the groove depth of the compressed groove 7
It is desirable to set the ratio to be about 0.7.

The groove shoulder low compression parts 18, 18 are preferably formed on both side walls in view of balance, but may be formed only at least on the side wall surface on the compression entry side of the absorbent article.

By the way, in the case of the groove forming projection 10 B, the height difference J can be made variable according to the thickness of the absorber 4. As shown in FIG. 10, the groove bottom high-pressure part 12 and the groove bottom low-pressure part 13 are formed on the front end face, and the groove-forming projection 21 having both side walls 22, 22 inclined. The groove shoulder forming member piece 20 having a through hole 20a matching the side wall shape of the groove forming protrusion 21
To be attached. The height difference J can be adjusted to an arbitrary height difference by preparing a plurality of types of groove shoulder forming member pieces 20 having different through-holes 20a and different insertion depths. In this case, a split pin 23 may be provided as shown by a dashed line in order to prevent the groove shoulder forming member 20 from falling off.

[0036]

As described above in detail, according to the present invention, a compressed groove can be formed without breaking the topsheet, regardless of the thickness of the absorber and the physical properties of the topsheet material.

[Brief description of the drawings]

FIG. 1 is a partially exploded development view of a sanitary napkin 1 manufactured according to the present invention.

FIG. 2 is a view showing how to form a compressed groove 7;

FIG. 3 is a front view of a groove forming projection 10A according to a first embodiment.

FIG. 4 is a perspective view thereof.

FIG. 5 is a perspective view of an essential part showing an aspect of forming a compressed groove 7 by a groove forming projection 10A.

FIG. 6 is a trajectory diagram showing a state in which a compressed groove 7 is formed by a groove forming projection 10A.

FIG. 7 is a front view of a groove forming projection 10B according to a second embodiment.

FIG. 8 is a perspective view thereof.

FIG. 9 is a perspective view of an essential part showing an aspect of forming a compressed groove 7 by a groove forming protrusion 10B.

FIG. 10 is a view showing a procedure for forming the groove shoulder low compression portion 18 by mounting the groove shoulder forming member 20;

FIG. 11 is a front view of a conventional groove forming projection.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable surface sheet, 4 ... Absorbent, 5 ... Crepe paper, 6 ... Side nonwoven fabric, 7 ... Press groove, 8 ... Press groove forming apparatus, 9 ... Pressing roll for forming a pressing groove, 10 / 10A / 10B ... Protrusion for forming a groove, 11 ... Anvil roll, 12 ... High-pressure pressing section for forming a groove bottom,
13 ... groove bottom low compression part, 14 ... side compression part, 18 ... groove shoulder low compression part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // A61F 13/53 A41B 13/02 S 13/49 (72) Inventor Shigeyuki Yamamoto 151 Atsuhara, Fuji City, Shizuoka Prefecture -2 F-term (reference) in Daiosan Tally Products Co., Ltd.

Claims (8)

[Claims] 1. An absorbent body is interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, and the surface sheet and the absorber are squeezed linearly from the liquid-permeable topsheet side. In the absorbent article in which a compressed groove is formed, the compressed groove has a groove bottom high-pressure pressed portion at the tip end surface portion and a groove bottom low-pressed portion having a height difference with the groove bottom high-pressure pressed portion along the longitudinal direction. And a groove-forming projection formed with an inclined surface-shaped side compressed portion with respect to at least the side wall surface on the compressed approach side for the absorbent article including the groove-bottom high-pressure portion and the groove-bottom low-press portion. An absorbent article characterized by being formed by a pressing body for forming a compressed groove. 2. An absorbent body is interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, and the surface sheet and the absorber are squeezed linearly from the liquid-permeable topsheet side. In the absorbent article in which a compressed groove is formed, the compressed groove has a groove bottom high-pressure pressed portion at the tip end surface portion and a groove bottom low-pressed portion having a height difference with the groove bottom high-pressure pressed portion along the longitudinal direction. And alternately formed, forming a side-squeezed portion in the form of an inclined surface with respect to at least the side wall surface on the squeezing approach side to the absorbent article including the groove bottom high-pressure pressed portion and the groove bottom low-pressed portion, and in the side pressed portion An absorbent article characterized by being formed by a pressurized groove forming pressurized body having a groove forming projection formed with a continuous stepped groove shoulder low compressed portion. 3. An absorbent article in which an absorber is interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, wherein the topsheet and the absorber are linearly arranged on the liquid-permeable topsheet side. A manufacturing device for forming a pressing groove by pressing the pressing device, wherein the manufacturing device includes a pressing roller for forming a pressing groove, and an anvil roll adjacent to the pressing roller for forming a pressing groove in a vertical direction. The pressurizing roll for forming a pressurized groove, the pressurized roll for forming a pressurized groove, a pressurized groove bottom portion at the tip end portion, and a pressurized groove bottom portion having a height difference from the pressurized groove bottom portion. For forming a groove formed alternately along the longitudinal direction, and formed with a side-squeezed portion having an inclined surface shape with respect to at least the side wall surface on the squeezing approach side for the absorbent article including the groove bottom high pressure portion and the groove bottom low pressure portion. Absorbent article characterized by comprising a projection on the peripheral surface Manufacturing equipment. 4. An absorbent article having an absorbent body interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, wherein the topsheet and the absorbent body are linearly arranged on the liquid-permeable topsheet side. A manufacturing device for forming a pressing groove by pressing the pressing device, wherein the manufacturing device includes a pressing roller for forming a pressing groove, and an anvil roll adjacent to the pressing roller for forming a pressing groove in a vertical direction. The pressurizing roll for forming a pressurized groove, the pressurized roll for forming a pressurized groove, a pressurized groove bottom portion at the tip end portion, and a pressurized groove bottom portion having a height difference from the pressurized groove bottom portion. Formed alternately along the longitudinal direction, forming a side-squeezed portion having an inclined surface shape with respect to the side wall surface on the squeezing approach side for at least the absorbent article including the groove bottom high pressure portion and the groove bottom low pressure portion, and A step-shaped groove shoulder low compression part is formed continuously to the side compression part Apparatus for manufacturing absorbent articles, characterized in that it comprises a groove forming protrusions on circumferential surface. 5. The absorption according to claim 4, wherein the stepped groove shoulder low compression portion is formed by mounting a groove shoulder forming member, and a height difference from the groove bottom low compression portion is variable. Manufacturing equipment for cosmetic articles. 6. The apparatus for manufacturing an absorbent article according to any one of claims 1 and 2, or an apparatus for manufacturing an absorbent article according to any one of claims 3 to 5, wherein the inclination angle of the side compression section is 15 to 60 °. 7. The apparatus for manufacturing an absorbent article according to any one of claims 1 and 2, or an apparatus for manufacturing an absorbent article according to any one of claims 3 to 5, wherein a tip width of the groove bottom high-pressure pressing section is 1 to 5 mm. 8. The absorbent article according to claim 1, wherein the height difference between the groove bottom high-pressure part and the groove bottom low-pressure part is 0.1 to 1.0 mm. An apparatus for manufacturing the absorbent article according to any one of the above.