JP2021003210A - Absorbent article, nonwoven fabric sheet, and manufacturing method of nonwoven fabric sheet - Google Patents

Abstract

To provide an absorbent article capable of suppressing worsening of air permeability, to provide a nonwoven fabric sheet, and to provide a manufacturing method of the nonwoven fabric sheet.SOLUTION: An absorbent article 1 comprises a nonwoven fabric sheet 10 having a hydrophobic ink 2. In plane view of the nonwoven fabric sheet 10, the nonwoven fabric sheet 10 is provided with an ink region IR in which the hydrophobic ink 2 is arranged, and a non-ink region NR in which the hydrophobic ink 2 is not arranged. A thickness Ti of the nonwoven fabric sheet 10 of the ink region IR is thinner than a thickness Tn of the nonwoven fabric sheet 10 of the non-ink region NR.SELECTED DRAWING: Figure 4

Description

The present invention relates to an absorbent article, a non-woven fabric sheet, and a method for producing a non-woven fabric sheet.

Conventionally, an absorbent article including a non-woven fabric sheet having an ink composed of a pigment or a dye is widely known. For example, in Patent Document 1, the non-woven fabric sheet is colored cold with ink in order to conceal excrement.

Japanese Unexamined Patent Publication No. 2008-93290

Here, in the case where the hydrophobic ink is arranged on the non-woven fabric sheet, the gap between the fibers constituting the non-woven fabric sheet may be narrowed or the gap may be closed by the hydrophobic ink. In this case, since the air permeability of the portion where the hydrophobic ink is arranged deteriorates, stuffiness may easily occur when an absorbent article provided with the non-woven fabric sheet is worn.

Therefore, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an absorbent article, a non-woven fabric sheet, and a method for producing a non-woven fabric sheet, which can suppress deterioration of air permeability.

The absorbent article according to one aspect is an absorbent article provided with a non-woven fabric sheet having a hydrophobic ink, and in a plan view of the non-woven fabric sheet, the ink in which the hydrophobic ink is arranged on the non-woven fabric sheet. A region and a non-ink region in which the hydrophobic ink is not arranged are provided, and the thickness of the non-woven fabric sheet in the ink region is thinner than the thickness of the non-woven fabric sheet in the non-ink region.

The nonwoven fabric sheet according to one aspect is a nonwoven fabric sheet having hydrophobic ink and used for an absorbent article, and the hydrophobic ink is arranged on the nonwoven fabric sheet in a plan view of the nonwoven fabric sheet. An ink region and a non-ink region in which the hydrophobic ink is not arranged are provided, and the thickness of the non-woven fabric sheet in the ink region is thinner than the thickness of the non-woven fabric sheet in the non-ink region.

The method for producing a nonwoven fabric sheet according to one aspect is a method for producing a nonwoven fabric sheet used for an absorbent article, in which a step of arranging a hydrophobic ink cured by ultraviolet rays on the nonwoven fabric and at least the hydrophobic ink are arranged. It has a step of irradiating the ink region with ultraviolet rays.

In the ink region where the hydrophobic ink is arranged, the air between the device that irradiates the ultraviolet rays and the non-woven fabric is warmed by irradiating the ink with ultraviolet rays. The warmed air warms the air between the fibers of the non-woven fabric, which increases the bulk of the non-woven fabric. However, in the ink region, the hydrophobic ink is cured and dried by irradiating with ultraviolet rays. As a result, the fibers of the non-woven fabric are bonded to each other by the hydrophobic ink, and the fibers of the non-woven fabric are difficult to separate from each other. As a result, even if the air between the fibers of the non-woven fabric in the ink region is warmed, the bulk of the non-woven fabric sheet is unlikely to increase. In addition, since the energy generated by the ultraviolet rays applied to the ink region is used for curing the hydrophobic ink, it is difficult to warm the air between the fibers of the non-woven fabric in the ink region. As a result, the thickness of the non-woven fabric sheet in the ink region can be made thinner than the thickness of the non-woven fabric sheet in the non-ink region. This makes it possible to manufacture a non-woven fabric sheet capable of suppressing deterioration of the air permeability of the absorbent article.

FIG. 1 is a schematic front view of the absorbent article 1 according to the first embodiment. FIG. 2 is a schematic plan view of the absorbent article 1 according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the absorbent article according to the first embodiment. FIG. 4 is a schematic cross-sectional view of the absorbent article according to the first embodiment. FIG. 5 is a schematic cross-sectional view of the absorbent article according to the first embodiment. FIG. 6 is a schematic plan view of the absorbent article 1 according to the second embodiment as viewed from the skin surface side. FIG. 7 is a schematic cross-sectional view of the absorbent article 1 in the F7-F7 cross section in FIG. FIG. 8 is a schematic cross-sectional view of the absorbent article 1 in the F7-F7 cross section in FIG. FIG. 9 is a schematic cross-sectional view of the absorbent article according to the modified example. FIG. 10 is a diagram for explaining a method for manufacturing a nonwoven fabric sheet.

(1) Outline of Embodiment At least the following matters will be clarified by the description of this specification and the accompanying drawings.

The absorbent article according to one aspect is an absorbent article provided with a non-woven fabric sheet having a hydrophobic ink, and in a plan view of the non-woven fabric sheet, the ink in which the hydrophobic ink is arranged on the non-woven fabric sheet. A region and a non-ink region in which the hydrophobic ink is not arranged are provided, and the thickness of the non-woven fabric sheet in the ink region is thinner than the thickness of the non-woven fabric sheet in the non-ink region.

As a result, the non-woven fabric sheet in the ink region (hereinafter referred to as the ink portion) is recessed from the non-woven fabric sheet in the non-ink region due to the difference in thickness, and a recess, that is, a space is formed in the non-woven fabric sheet. Air is easier to pass through space than a non-woven fabric sheet in which fibers are entwined. Therefore, by improving the air permeability around the ink portion by the concave portion, it is possible to supplement the air permeability that tends to be lowered by the hydrophobic ink. As a result, deterioration of the air permeability of the absorbent article can be suppressed.

According to a preferred embodiment, the hydrophobic ink is disposed on one side of the non-woven fabric sheet in the thickness direction, and is recessed in the thickness direction on one side of the non-woven fabric sheet with respect to the periphery of the ink region. A recess is provided.

Since the recess is provided on one side where the hydrophobic ink is arranged, air that is difficult to pass through in the thickness direction due to the hydrophobic ink can pass through the recess in the plane direction. In addition, since the side wall portion of the recess is around the ink region, air in the recess easily passes through the non-woven fabric sheet around the ink region through the side wall portion. As a result, deterioration of the air permeability of the absorbent article can be suppressed.

According to a preferred embodiment, the fiber density of the non-woven fabric sheet in the non-ink region is smaller than the fiber density of the non-woven fabric sheet in the ink region.

As a result, since the gap between the fibers in the non-ink region is large, air can easily pass through in the non-ink region around the ink region, and by improving the air permeability around the ink portion, it is likely to be lowered by the hydrophobic ink. Breathability can be supplemented.

According to a preferred embodiment, the hydrophobic ink is arranged on one side of the non-woven fabric sheet in the thickness direction, and the thickness of the fiber on the one side of the non-woven fabric sheet is the other side of the non-woven fabric sheet. It is thicker than the thickness of the fiber.

By increasing the thickness of the fibers on one side of the non-woven fabric sheet (that is, the side on which the hydrophobic ink is arranged), the gap between the fibers on the one side can be increased. As a result, air can easily pass through the portion close to the hydrophobic ink, and deterioration of air permeability can be suppressed.

According to a preferred embodiment, the hydrophobic ink is arranged on one side of the nonwoven fabric sheet in the thickness direction, and the nonwoven fabric sheet is squeezed from the other side of the nonwoven fabric sheet in the thickness direction. It has a squeezing part.

On the other side where the non-woven fabric sheet is squeezed, the squeezing reduces the gaps between the fibers. For this reason, by arranging the hydrophobic ink on one side of the non-woven fabric sheet, which is less likely to reduce the gap between the fibers by pressing than on the other side, it is possible to easily pass air through the portion close to the hydrophobic ink, and the air permeability is deteriorated. Can be suppressed.

According to a preferred embodiment, the non-woven fabric sheet has an abutting sheet that contacts one side of the non-woven fabric sheet in the thickness direction, and the hydrophobic ink is arranged on the one side of the non-woven fabric sheet.

Since the non-woven fabric sheet in the ink region is thinner than the thickness of the non-woven fabric sheet around the ink region, a gap (space) is likely to be formed between the non-woven fabric sheet and the contact sheet in the ink region. As a result, in the ink region, air can easily pass through the gap between the non-woven fabric sheet and the contact sheet, and deterioration of the air permeability of the absorbent article can be suppressed. Further, since the hydrophobic ink is arranged on one side of the non-woven fabric sheet that comes into contact with the contact sheet, the hydrophobic ink does not come into direct contact with the wearer's skin, and the hydrophobic ink adheres to the wearer's skin. Can be suppressed.

According to a preferred embodiment, there is a composite sheet including a contact sheet that comes into contact with one side of the nonwoven fabric sheet in the thickness direction and the nonwoven fabric sheet, and the composite sheet comes into contact with the nonwoven fabric sheet. The sheet has a shrinkage region in which the sheet shrinks, at least a part of the ink region overlaps the shrinkage region in the thickness direction, and in at least a part of the ink region, the nonwoven fabric sheet and the contact sheet Is non-woven.

As a result, since the non-woven fabric sheet and the abutting sheet are not joined in at least a part of the ink region, the non-woven fabric sheet and the abutting sheet can be separated from each other in the thickness direction. When wrinkles are formed by shrinkage in the shrinkage region in at least a part of the ink region, the non-woven fabric sheet and the contact sheet are easily separated from each other, and the space between the non-woven fabric sheet and the contact sheet can be widened. As a result, air can more easily pass through the gap between the non-woven fabric sheet and the contact sheet, and deterioration of the air permeability of the absorbent article can be suppressed. Further, since the ink region has higher rigidity than the non-ink region, wrinkles are relatively difficult to form in the ink region, and it is easy to maintain a state in which the non-woven fabric sheet and the contact sheet are in contact with each other. Even when the non-woven fabric sheet and the abutting sheet are in contact with each other, the breathability can be supplemented by the recesses formed in the non-woven fabric sheet.

According to a preferred embodiment, the non-woven fabric sheet has a folded-back portion in which the non-woven fabric sheet is folded back, and an opposed portion facing the folded-back portion and in contact with the folded-back portion, and the folded-back portion of the non-woven fabric sheet. At least a part of the hydrophobic ink is arranged at a position where it overlaps with the hydrophobic ink in the facing portion in the thickness direction.

As a result, a larger space is likely to be formed in the region where at least a part of the hydrophobic ink in the folded portion overlaps with the hydrophobic ink in the facing portion in the thickness direction. As a result, air can more easily pass through the space between the folded-back portion and the facing portion, and deterioration of the air permeability of the absorbent article can be suppressed.

According to a preferred embodiment, the absorbent article is arranged on the non-skin surface side of the non-woven fabric sheet, and has an absorber that overlaps the ink region and the non-ink region in the thickness direction. The hydrophobic ink is arranged on the non-skin surface side of the non-woven fabric sheet, and the fiber density of the non-woven fabric sheet in the non-ink region is smaller than the fiber density of the non-woven fabric in the ink region.

Since the hydrophobic ink is arranged on the non-skin surface side, the hydrophobic ink does not come into direct contact with the wearer's skin, and it is possible to prevent the hydrophobic ink from adhering to the wearer's skin. Since the non-woven fabric sheet is thick in the non-ink region, the excrement can easily come into contact with the non-woven fabric sheet in the non-ink region, and the start of drawing in the excrement can be accelerated. In addition, since the fiber density of the ink region is high and the hydrophobic ink is arranged on the non-skin surface side of the non-woven fabric sheet, excrement can be drawn in the entire surface of the non-woven fabric sheet on the skin surface side. Therefore, it is possible to prevent a decrease in absorption speed. Further, in the ink region, even if the hydrophobic ink makes it difficult for the excrement to pass through to the non-skin surface side of the non-woven fabric sheet, the excrement can move to the non-skin surface side of the non-woven fabric sheet via the non-ink region. , It is possible to suppress the deterioration of absorption performance.

According to a preferred embodiment, the absorbent article is arranged on the non-skin surface side of the non-woven fabric sheet, and has an absorber that overlaps the ink region and the non-ink region in the thickness direction. The hydrophobic ink is arranged on the skin surface side of the non-woven fabric sheet, and the fiber density of the non-woven fabric sheet in the non-ink region is smaller than the fiber density of the non-woven fabric sheet in the ink region.

Since the non-woven fabric sheet is thick in the non-ink region, the excrement can easily come into contact with the non-woven fabric sheet in the non-ink region, and the start of drawing in the excrement can be accelerated. Further, since the excrement that has begun to be drawn in the non-ink region can be drawn by the capillary phenomenon in the portion on the non-skin surface side of the ink region having a high fiber density, it is possible to suppress a decrease in the speed of drawing the excrement. Since the hydrophobic ink is arranged on the skin surface side of the non-woven fabric sheet, it becomes difficult for excrement to return from the non-woven fabric sheet to the skin surface side in the ink region, and rewetback can be reduced.

According to a preferred embodiment, an absorber that is arranged on the non-skin surface side of the non-woven fabric sheet and that overlaps the ink region and the non-ink region in the thickness direction and abuts the wearer's skin. It has a skin surface sheet having a contact surface, and the non-woven fabric sheet is arranged between the skin surface sheet and the absorber in the thickness direction.

Since the excrement can be quickly absorbed by the skin surface sheet, the excrement does not continue to remain on the contact surface of the skin surface sheet, so that the excrement can be prevented from leaking through the wearer's body.

Further, since the skin surface sheet is present on the skin surface side of the non-woven fabric sheet having the hydrophobic ink, it is possible to prevent the hydrophobic ink from adhering to the wearer's skin.

According to a preferred embodiment, the thickness of the non-woven fabric sheet in the ink region is smaller than the thickness of the non-woven fabric sheet in the non-ink region with the boundary between the ink region and the non-ink region as a boundary. ..

By changing the thickness of the non-woven fabric sheet near the boundary between the ink region and the non-ink region, the side wall portion of the recess can be provided from the place where the hydrophobic ink is no longer arranged. As a result, the air permeability around the ink portion can be improved, so that the air permeability that tends to be lowered by the hydrophobic ink can be supplemented. As a result, deterioration of the air permeability of the absorbent article can be suppressed.

The nonwoven fabric sheet according to one aspect is a nonwoven fabric sheet having hydrophobic ink and used for an absorbent article, and the hydrophobic ink is arranged on the nonwoven fabric sheet in a plan view of the nonwoven fabric sheet. An ink region and a non-ink region in which the hydrophobic ink is not arranged are provided, and the thickness of the non-woven fabric sheet in the ink region is thinner than the thickness of the non-woven fabric sheet in the non-ink region.

The method for producing a nonwoven fabric sheet according to one aspect is a method for producing a nonwoven fabric sheet used for an absorbent article, in which a step of arranging a hydrophobic ink cured by ultraviolet rays on the nonwoven fabric and at least the hydrophobic ink are arranged. It has a step of irradiating the ink region with ultraviolet rays.

In the ink region where the hydrophobic ink is arranged, the air between the device that irradiates the ultraviolet rays and the non-woven fabric is warmed by irradiating the ink with ultraviolet rays. The warmed air warms the air between the fibers of the non-woven fabric, which increases the bulk of the non-woven fabric. However, in the ink region, the hydrophobic ink is cured and dried by irradiating with ultraviolet rays. As a result, the fibers of the non-woven fabric are bonded to each other by the hydrophobic ink, and the fibers of the non-woven fabric are difficult to separate from each other. As a result, even if the air between the fibers of the non-woven fabric in the ink region is warmed, the bulk of the non-woven fabric sheet is unlikely to increase. In addition, since the energy generated by the ultraviolet rays applied to the ink region is used for curing the hydrophobic ink, it is difficult to warm the air between the fibers of the non-woven fabric in the ink region. As a result, the thickness of the non-woven fabric sheet in the ink region can be made thinner than the thickness of the non-woven fabric sheet in the non-ink region. This makes it possible to manufacture a non-woven fabric sheet capable of suppressing deterioration of the air permeability of the absorbent article.

(2) Overall Outline of Absorbent Articles The absorbent articles according to the embodiment will be described below with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic and the ratio of each dimension is different from the actual one. Therefore, the specific dimensions, etc. should be determined in consideration of the following explanation. In addition, there may be a portion in which the relationship and ratio of dimensions of the drawings are different from each other.

The absorbent article is, for example, a pants-type disposable diaper, a tape-type disposable diaper, or a shorts-type sanitary napkin. The absorbent article of the embodiment is a pants-type disposable diaper.

FIG. 1 is a schematic front view of the absorbent article 1 according to the present embodiment. FIG. 2 is a schematic plan view of the absorbent article 1 according to the present embodiment. The schematic plan view shown in FIG. 2 shows an stretched state in which the absorbent article 1 is stretched to a state in which wrinkles are not formed in a state where the side joint portion 18 described later is unfolded. FIG. 2 is a schematic plan view of the absorbent article 1 as viewed from the skin surface side T1. 3 to 5 are schematic cross-sectional views of the absorbent article according to the present embodiment. FIG. 3 is a schematic cross-sectional view taken along the F3-F3 cross section shown in FIG. FIG. 4A is a schematic cross-sectional view taken along the cross section of F4A-F4A shown in FIG. 4B and 4C are enlarged schematic cross-sectional views of the center sheet 41A and the absorber 50. FIG. 5A is an enlarged schematic cross-sectional view of the front exterior body 20. FIG. 5B is an enlarged schematic cross-sectional view of the side sheet 41B. For convenience of explanation, it should be noted that even if the members are separated in the thickness direction, they are in contact with each other in the thickness direction in the actual product.

The absorbent article 1 has an anteroposterior direction L, a width direction W, and a thickness direction. The anteroposterior direction L is defined by the direction extending to the anterior side and the posterior side of the body. In other words, the anteroposterior direction L is a direction extending anterior-posteriorly in the deployed absorbent article 1. The width direction W is a direction orthogonal to the front-rear direction L. Further, the thickness direction T is orthogonal to both the front-rear direction L and the width direction W. The thickness direction T extends to the skin surface side T1 facing the wearer side and the non-skin surface side T2 on the side opposite to the skin surface side. The plane direction P indicates the direction of the plane along the front-rear direction L and the width direction W.

The absorbent article 1 has a front side region S1, a rear side region S2, and an inseam region S3. The front side region S1 is a region facing the wearer's front waist circumference (abdomen). The rear side region S2 is an region facing the back waist (back) of the wearer, and includes an region on which the body (buttocks) is placed when worn. The inseam area S3 is located in the inseam of the wearer and is a region sandwiched between the front side area S1 and the rear side area S2.

As shown in FIG. 1, a side joint portion 18 may be provided in which the end portion of the front side region S1 in the width direction W and the end portion of the rear side region S2 in the width direction W are joined. The side joint portion 18 is defined by a portion in which the outer portion of the front side region S1 and the outer portion of the rear side region S2 are locked to each other. As shown in FIG. 1, in the state where the side joint 18 is formed, the absorbent article 1 has a waist opening 16 through which the wearer's body is passed and a pair of legs into which the wearer's legs are inserted. The leg circumference opening 17 is formed. The waist opening 16 may be defined by the front edge S1F of the front region S1 and the trailing edge S2R of the rear region S2.

Here, FIG. 2 shows a state in which the joint at the side joint portion 18 is released and the absorbent article 1 is unfolded. The side joint portion 18 may extend along the front-rear direction L in each of the front exterior body 20 and the rear exterior body 30. In the pants-type absorbent article, the boundary between the front side region S1 and the inseam region S3 may be defined by the rear end edge of the side joint 18 provided on the front exterior body 20. Similarly, the boundary between the rear side region S2 and the inseam region S3 may be defined by the front end edge of the side joint portion 18 provided on the rear exterior body 30. The inseam area S3 may be an area provided with the leg circumference opening 17.

The outer portion in the present invention is a portion that occupies a certain range in the width direction W including the outer edge in the width direction W, and the outer edge is an outer edge in the width direction W. The inner portion in the present invention is a portion that occupies a certain range in the width direction W including the inner edge in the width direction W, and the inner edge is an inner edge in the width direction W. Further, the front end portion and the rear end portion in the present invention are portions that occupy a certain range in the front-rear direction L including the edge in the front-rear direction L, and the front end edge and the rear end edge are edges in the front-rear direction L. The outer edge includes a front edge and a trailing edge, and the outer edge includes a front edge and a trailing edge.

In the present embodiment, the absorbent article 1 may have an exterior body 15 and an absorbent body 40. The exterior body 15 overlaps the absorbent body 40 in the thickness direction T. The exterior body 15 is arranged at least in the waist circumference area that covers the waist circumference of the wearer. The exterior body 15 may have at least a front exterior body 20 arranged in the front side region S1 and a rear exterior body 30 arranged at least in the rear side region S2. The front exterior body 20 may be arranged in the inseam area S3 in addition to the front side area S1, and the rear exterior body 30 may be arranged in the inseam area S3 in addition to the rear side area S2. The exterior body 15 may be a combination of the front exterior body 20 and the rear exterior body 30.

The front exterior body 20 may be arranged on the non-skin surface side T2 of the absorbent body 40 in the front side region S1. The rear exterior body 30 may be separated from the front exterior body 20 in the front-rear direction L, and may be arranged on the non-skin surface side T2 of the absorbent main body 40 in the rear side region S2.

The front exterior body 20 includes a first front seat 25 located on the non-skin surface side T2 of the absorbent body 40 and a second front seat 26 located on the non-skin surface side T2 of the first front seat 25. May have. The first front sheet 25 and the second front sheet 26 may be made of a non-woven fabric sheet. The rear exterior body 30 includes a first rear seat 35 located on the non-skin surface side T2 of the absorbent body 40 and a second rear seat 36 located on the non-skin surface side T2 of the first rear seat 35. And may have. The first rear sheet 35 and the second rear sheet 36 may be made of a non-woven fabric sheet.

The exterior body 15 may have a waist elastic member WE having elasticity. The waist elastic member WE may be arranged so as to extend in the width direction W and may have elasticity in the width direction W. A plurality of waist elastic members WE may be arranged in the front-rear direction L. The waist elastic member WE may have a front waist elastic member 22 arranged on the front exterior body 20 and a rear waist elastic member 32 arranged on the rear exterior body 30. The front waist elastic member 22 may be arranged between the first front seat 25 and the second front seat 26 in the thickness direction T. The rear waist elastic member 32 may be arranged between the first rear seat 35 and the second rear seat 36 in the thickness direction T. The waist elastic member WE may be composed of, for example, a thread rubber that can be expanded and contracted in the width direction W, or an elastic sheet that can be expanded and contracted in the width direction W. The waist elastic member WE may be composed of, for example, the exterior body 15 itself made of a stretchable sheet. The waist elastic member WE of the present embodiment is made of thread rubber.

The absorbent body 40 is arranged at least in the inseam area S3. The absorbent body 40 may be arranged over the anterior region S1, the posterior region S2 and the inseam region S3. The absorbent main body 40 is configured as a separate body from the front exterior body 20 and the rear exterior body 30, and may be joined to the front exterior body 20 and the rear exterior body 30 in the front side region S1 and the rear side region S2, respectively.

The absorbent body 40 (absorbent article 1) has an absorber 50. The absorber 50 has at least an absorption core. Absorption cores include absorbent materials that absorb liquids. The absorption core may include, for example, ground pulp or a highly absorbent polymer (SAP), or a mixture thereof. The absorption core is located at least in the inseam area S3. The absorption core may be arranged in the front side region S1 and may be arranged in the rear side region S2. The absorption core may extend from the front side region S1 to the rear side region S2 in the front-rear direction L. The absorber 50 may have a core wrap covering the absorption core. The core wrap may sandwich the absorbing core in the thickness direction T. The core wrap may be composed of, for example, a tissue or a non-woven fabric.

The absorbent body 40 is composed of a skin surface sheet 41 located on the skin surface side T1 of the absorber 50, a liquid impermeable sheet 42 located on the non-skin surface side T2 of the absorber 50, and a liquid impermeable sheet 42. May also have a main body sheet 43 arranged on the non-skin surface side T2. The skin surface sheet 41 has a contact surface that comes into contact with the wearer's skin. The skin surface sheet 41 has a center sheet 41A that covers the center of the absorber 50 in the width direction W, and a pair of side sheets 41B that cover the outer portion of the center sheet 41A on the skin surface side T1 of the center sheet 41A. You can. The skin surface sheet 41 may have liquid permeability, and may be made of, for example, a non-woven fabric. The liquid opaque sheet 42 may have permeable and opaque properties, and may be made of, for example, a film. The main body sheet 43 may have hydrophobicity, and may be composed of, for example, a non-woven fabric having hydrophobicity.

(3) Non-woven fabric sheet Next, the non-woven fabric sheet 10 will be described with reference to FIGS. 2 to 5. The absorbent article 1 includes a non-woven fabric sheet 10 made of a non-woven fabric. The non-woven fabric may be, for example, any of air-through non-woven fabric, spunbond non-woven fabric, spunlace non-woven fabric and the like.

The non-woven fabric sheet 10 may be at least one of a first front sheet 25, a second front sheet 26, a first rear sheet 35, a second rear sheet 36, a center sheet 41A, a side sheet 41B, and a main body sheet 43. ..

The non-woven fabric sheet 10 has the hydrophobic ink 2. In a plan view of the non-woven fabric sheet 10, the non-woven fabric sheet 10 is provided with an ink region IR in which the hydrophobic ink 2 is arranged and a non-ink region NR in which the hydrophobic ink 2 is not arranged. The hydrophobic ink 2 may be arranged (coated) by printing, for example. The method for printing the hydrophobic ink 2 may be flexographic printing or gravure printing. The hydrophobic ink 2 may contain a material that is cured by ultraviolet rays (UV). Examples of the material that is cured by ultraviolet rays include urethane acrylate, acrylic resin acrylate, and epoxy acrylate. Whether or not the hydrophobic ink 2 contains a material that is cured by ultraviolet rays can be measured by the following method.

First, the hydrophobic ink 2 is collected from the non-woven fabric sheet 10 (ink portion 11) of the ink region IR using tweezers.

Second, the collected hydrophobic ink 2 is irradiated with infrared light using a Fourier transform infrared spectrophotometer (FT-IR), and the peak of the functional group is measured.

Third, it is determined whether the measured peak coincides with the peak of a known material that is cured by UV light. When the measured peaks match, it can be determined that the hydrophobic ink is cured by ultraviolet rays.

As shown in FIG. 2, the ink region IR may have a first ink region IR1, a second ink region IR2, a third ink region IR3, and a fourth ink region IR4. The first ink region IR1 is provided on the non-woven fabric sheet 10 constituting the center sheet 41A.
The second ink region IR2 and the third ink region IR3 are provided on the non-woven fabric sheet 10 constituting the side sheet 41B. The second ink region IR2 is provided in a portion where the three-dimensional gathers are arranged. The third ink region IR3 is provided in a portion where leg gathers are arranged. The fourth ink region IR4 is provided on the second front sheet 26 and the second rear sheet 36.

The three-dimensional gather can stand on the skin side T1. The three-dimensional gather includes an upright portion capable of standing up by contraction of the first elastic member 65 having elasticity in the front-rear direction L, and a component member arranged on the side sheet 41B and the non-skin surface side T2 of the side sheet 41B. It may have a joint portion to be joined. The three-dimensional gather becomes a wall by standing up and prevents excrement from moving to the outside in the width direction W. Further, the leg gathers are arranged outside the three-dimensional gathers in the width direction W, and contract due to the contraction of the second elastic member 66 having elasticity in the front-rear direction L. The leg gathers fit around the wearer's legs to prevent excrement from leaking out of the absorbent material.

The non-woven fabric sheet 10 has an ink portion 11 composed of the non-woven fabric sheet 10 in the ink region IR and a non-ink portion 12 composed of the non-woven fabric sheet 10 in the non-ink region NR. The ink portion 11 may have an ink layer 11A in which the hydrophobic ink 2 is present and a non-ink layer 11B in which the hydrophobic ink 2 is not present. The ink layer 11A may be composed of a portion in which the non-woven fabric sheet 10 is impregnated with the hydrophobic ink and the hydrophobic ink 2 itself.

As used herein, the term "hydrophobic" means a property that is difficult to be compatible with water or retains water, and means, for example, a contact angle with ion-exchanged water of 80 ° or more. The contact angle with ion-exchanged water can be measured by the method described in "Measurement of initial contact angle" in JP-A-2005-324010.

The hydrophobic ink 2 may be arranged on one side of the non-woven fabric sheet 10 in the thickness direction T. Therefore, the hydrophobic ink 2, that is, the ink layer 11A may be arranged on the non-skin surface side T2 of the non-woven fabric sheet 10 in the thickness direction T, or may be arranged on the skin surface side T1 of the non-woven fabric sheet 10 in the thickness direction T. It may be arranged. As shown in FIGS. 4B, 4C, and 5, a recess S recessed in the thickness direction T from the periphery of the ink region IR may be provided on one side of the non-woven fabric sheet 10. That is, a recess S recessed in the thickness direction T from the side where the hydrophobic ink 2 is arranged may be provided. In FIGS. 4B and 4C, the recess S is recessed from the non-skin surface side T2 to the skin surface side T1. In FIG. 5A, the recess S is recessed from the skin surface side T1 to the non-skin surface side T2. In FIG. 5B, the recess S is recessed from the non-skin surface side T2 to the skin surface side T1 in the non-woven fabric sheet 10 on the skin surface side T1, and is not from the skin surface side T1 in the non-woven fabric sheet 10 on the non-skin surface side T2. It is dented to T2 on the skin side.

As shown in FIG. 4B, the thickness Ti of the non-woven fabric sheet 10 (that is, the ink portion 11) in the ink region IR is thinner than the thickness Tn of the non-woven fabric sheet 10 (that is, the non-ink portion 12) in the non-ink region NR. .. For example, the ratio (Tn / Ti) of the thickness Tn of the non-ink portion 12 to the thickness Ti of the ink portion 11 may be 0.85 or less. In this case, since the space formed by the recess S can be increased, the air permeability of the absorbent article can be improved. The thickness ratio (Tn / Ti) may be 0.2 or more. In this case, it becomes difficult for the wearer to feel the step at the boundary between the ink region IR and the non-ink region NR. Therefore, it is less likely to give the wearer a sense of discomfort, and deterioration of the comfort of the absorbent article 1 can be suppressed.

For example, when the thickness Ti of the ink portion 11 is 1.1 to 1.3 μm, the thickness Tn of the non-ink portion 12 may be 1.6 to 1.8 μm. It should be noted that the total thickness of the ink portion 11 does not have to be larger than the total thickness of the non-ink portion 12.

In the plan view of the non-woven fabric sheet 10, the thickness Ti of the non-woven fabric sheet 10 of the ink region IR is the non-woven fabric sheet of the non-ink region NR with the boundary between the ink region IR and the non-ink region NR (hereinafter referred to as an ink boundary) as a boundary. It may be thinner than the thickness Tn of 10. The side wall portion of the recess S has a portion not covered with the hydrophobic ink 2. It is preferable that the side wall portion of the recess S is not completely covered with the hydrophobic ink 2. The bottom of the recess S is composed of the ink layer 11A and does not have to be composed of the non-ink layer 11B. That is, only the ink layer 11A may form the bottom of the recess S.

In addition, in FIG. 3 and FIG. 4A, the arrangement location of the hydrophobic ink 2 (ink layer 11A) is shown in an easy-to-understand manner, and the thickness of the hydrophobic ink 2 and the thickness of the non-woven fabric sheet 10 are not shown. It should be noted that there is no such thing.

The thickness of the non-woven fabric sheet 10 can be measured by, for example, the following method. Using a digital microscope (for example, a digital microscope VHX-100 manufactured by KEYENCE CORPORATION), a magnified image is taken from a direction perpendicular to the cut surface of the non-woven fabric sheet 10. The enlarged image is an image enlarged to such that the entire thickness direction T of the non-woven fabric sheet 10 can be photographed, and the enlarged magnification is, for example, 20 to 50 times. The thickness of the non-woven fabric sheet 10 is measured based on the obtained enlarged image. The enlarged image may be image-processed so that the thickness can be easily measured. The average value of the thickness measured at three separate cut surfaces in each of the smooth portion with the non-ink region NR (that is, the portion not affected by pressing and printing, etc.) and the ink region IR. The thickness of the non-woven fabric sheet 10 is set.

The fiber density of the non-woven fabric sheet 10 in the non-ink region NR may be smaller than the fiber density of the non-woven fabric sheet 10 in the ink region IR. Therefore, the fiber density of the non-ink layer 11B of the ink portion 11 may be smaller than the fiber density of the non-ink portion 12.

The fiber density of the non-woven fabric sheet 10 can be measured by, for example, the following method. Specifically, when measuring the fiber densities of the respective non-woven fabric sheets 10 in the ink region IR and the non-ink region NR, the following methods can be used.

First, the ink portion 11 and the non-ink portion 12 are cut out to a size of 10 mm × 10 mm and used as a sample.

Second, the cut surface parallel to the thickness direction T of the sample is magnified and observed using a scanning electron microscope (manufactured by JEOL Ltd .: JCM-5100). The magnification is such that the cross section of 30 to 60 fibers can be measured in one screen (example: 150 to 500 times).

Third, the number of cross sections of the fibers is measured in each of the ink portion 11 and the non-ink portion 12. Specifically, the number of cross sections of the cut fiber is counted on the cut surface having a predetermined area. In the ink portion 11, in order to avoid the influence of the fibers absorbing the hydrophobic ink 2, the ink layer 11A and the non-ink layer 11B are separated in the thickness direction T, and then the cross section of the fibers in the non-ink layer 11B. Measure the number of. When the non-woven fabric sheet 10 is formed by laminating a plurality of fiber layers, the number of cross sections of the cut fibers in the same fiber layer in the ink portion 11 and the non-ink portion 12 is counted.

Fourth, the number of cross sections of the obtained fibers is converted into the number of cross sections of the fibers around 1 mm ² and this is defined as the fiber density (book / mm ² ). The measurement is performed at three places, and the average value of the measured values is taken as the fiber density of the sample.

Although the number of fibers per unit area in the cross section parallel to the thickness direction T is used as the fiber density, the number of fibers per unit volume may be used as the fiber density. The number of fibers per unit volume can be obtained by, for example, analysis by X-ray CT. Although the numerical values are different between the fiber density per unit area and the fiber density per unit volume, they are the same in the relative comparison of fiber densities (example: comparison of size).

Further, the fiber density of the non-woven fabric sheet 10 on one side on which the hydrophobic ink 2 is arranged may be smaller than the fiber density on the surface of the non-woven fabric sheet 10 on the other side on which the hydrophobic ink 2 is not arranged. As a result, the gap between the fibers on the side where the hydrophobic ink 2 is arranged can be increased, air can easily pass through on the side where the hydrophobic ink 2 is arranged, and deterioration of air permeability can be suppressed. The fiber density in this case can be measured by the following method.

One side of the non-woven fabric sheet 10 on which the hydrophobic ink 2 is arranged (for example, the surface of the non-skin surface side T2 of the skin surface sheet 41 in FIG. 4) and the other side on which the hydrophobic ink 2 is not arranged. Photographed with an electron microscope or a microscope (for example, (VHX-2000 manufactured by KEYENCE)) with respect to each of the surfaces of the non-woven fabric sheet 10 (for example, the surface of the skin surface sheet 41 on the skin surface side T1 in FIG. 4). By doing so, a magnified image of the fiber is obtained. The area of the fiber per unit area in the image is measured. From this, the area ratio of the fiber is calculated. The area ratio of the fibers can be regarded as the fiber density, and the fiber density of the non-woven fabric sheet 10 on one side and the fiber density of the non-woven fabric sheet 10 on the other side can be compared.

Further, the fiber thickness of the non-woven fabric sheet 10 on one side on which the hydrophobic ink 2 is arranged may be thicker than the fiber thickness on the non-woven fabric sheet 10 on the other side on which the hydrophobic ink 2 is not arranged. Therefore, the thickness of the fibers of the non-ink layer 11B close to the ink layer 11A or the ink layer 11A may be thicker than the thickness of the fibers of the non-ink layer 11B far from the ink layer 11A. The thickness of the fiber can be measured by, for example, the following method.

This is performed by obtaining a magnified image of the fiber with an electron microscope or a microscope (for example, (VHX-2000 manufactured by KEYENCE)) and measuring the distance between two points corresponding to the diameter of the fiber reflected in the image.

One side of the non-woven fabric sheet 10 on which the hydrophobic ink 2 is arranged (for example, the surface of the non-skin surface side T2 of the skin surface sheet 41 in FIG. 4) and the other side on which the hydrophobic ink 2 is not arranged. Each of the surface of the non-woven fabric sheet 10 (for example, the surface of the skin surface sheet 41 on the skin surface side T1 in FIG. 4) is measured a plurality of times (the number is 100 as a guide). The average value of the measured fiber diameters is taken as the fiber thickness. Therefore, it can be determined that the larger the average value of the fiber diameters, the thicker the fibers.

Further, when the hydrophobic ink 2 is arranged on the skin surface side T1, the thickness of the fibers on the skin surface side T1 may be thicker than the thickness of the fibers on the non-skin surface side T2 in the non-ink portion 12.

Further, the non-woven fabric sheet 10 may have a pressed portion (not shown) pressed in the thickness direction T. The ink region IR does not have to be provided with a pressing portion. Therefore, the non-woven fabric sheet 10 may be provided with a squeezed portion only in the non-ink region NR. A pressing portion may be provided in the ink region IR. The non-woven fabric sheet 10 may have a squeezed portion squeezed from the other side on which the hydrophobic ink 2 is not arranged. The non-woven fabric sheet 10 may have a squeezed portion pressed from the side on which the hydrophobic ink 2 is arranged.

Further, the absorbent article 1 may have a composite sheet 13. The composite sheet 13 may include a non-woven fabric sheet 10 on which the hydrophobic ink 2 is arranged and a contact sheet that abuts on one side of the non-woven fabric sheet 10 in the thickness direction T. For example, as shown in FIG. 5A, when the composite sheet 13 is composed of the first sheet 13A and the second sheet 13B laminated in the thickness direction T, the hydrophobic ink 2 is arranged on the first sheet 13A. The non-woven fabric sheet 10 is made, and the second sheet 13B may be a contact sheet that comes into contact with one side of the non-woven fabric sheet 10 in the thickness direction T. The first sheet 13A and the second sheet 13B may be joined by the joining portion B.

As shown in FIG. 5A, the composite sheet 13 may have a shrinkage region CR in which the first sheet 13A (nonwoven fabric sheet 10) and the second sheet 13B (contact sheet) shrink. In the contraction region CR, the first sheet 13A and the second sheet 13B may be contracted by the elastic members (for example, waist elastic member WE, first elastic member 65, second elastic member 66, etc.) included in the composite sheet 13. However, since at least one of the first sheet 13A and the second sheet 13B is a sheet-shaped elastic member, the first sheet 13A and the second sheet 13B may shrink.

As shown in FIG. 5A, at least a part of the ink region IR may overlap the shrink region CR in the thickness direction T. The first sheet 13A and the second sheet 13B may be non-bonded to at least a part of the ink region IR. Therefore, the joint portion B for joining the sheets does not have to overlap with the ink region IR in the thickness direction T. All of the ink region IRs may be unbonded.

As shown in FIG. 4A, the non-woven fabric sheet 10 may have a folded-back portion 10f in which the non-woven fabric sheet 10 is folded back, and an opposed portion 10c facing the folded-back portion 10f and in contact with the folded-back portion 10f. The facing portion 10c may be a portion where the non-woven fabric sheet 10 is not folded back. As shown in FIG. 5B, at least a part of the hydrophobic ink 2 of the folded-back portion 10f may be arranged at a position overlapping the hydrophobic ink 2 of the facing portion 10c in the thickness direction T.

Further, as shown in FIG. 4, the absorber 50 may be arranged on the non-skin surface side T2 of the non-woven fabric sheet 10. The absorber 50 may overlap the ink region IR and the non-ink region NR in the thickness direction T. The hydrophobic ink 2 may be arranged on the non-skin surface side T2 of the non-woven fabric sheet 10. Therefore, the ink layer 11A may be arranged on the non-skin surface side T2 of the non-woven fabric sheet 10. As described above, the fiber density of the non-woven fabric sheet 10 in the non-ink region NR may be smaller than the fiber density of the non-woven fabric sheet 10 in the ink region IR.

Further, the fiber density of the non-woven fabric sheet 10 in the non-ink region NR near the ink boundary between the ink region IR and the non-ink region NR (for example, within a range of 5 mm from the ink boundary) and the non-ink region separated from the ink boundary by a predetermined distance. The difference from the fiber density of the non-woven fabric sheet 10 of NR (for example, in the range of 10 mm to 15 mm from the ink boundary) may be within 5%. As a result, the fiber density of the non-woven fabric sheet 10 in the non-ink region NR does not change significantly in a predetermined range from the vicinity of the ink boundary, so that the air permeability and the absorption performance can be stabilized in the non-ink region NR.

Further, the fiber density of the non-woven fabric sheet 10 in the ink region IR near the ink boundary (for example, within a range of 5 mm from the ink boundary) and the ink region IR (for example, in the range of 10 mm to 15 mm from the ink boundary) separated from the ink boundary by a predetermined distance. ) May be within 5% of the fiber density of the non-woven fabric sheet 10. As a result, since the fiber density of the non-woven fabric sheet 10 in the ink region IR does not change significantly in a predetermined range from the vicinity of the ink boundary, it is possible to prevent the air permeability and absorption performance from being significantly deteriorated in the ink region IR.

As described above, in the absorbent article 1, the non-woven fabric sheet 10 in the ink region IR is recessed from the non-woven fabric sheet 10 in the non-ink region NR due to the difference in thickness between the ink portion 11 and the non-ink portion 12. is there. Due to this difference in thickness, a recess S, that is, a space is formed in the non-woven fabric sheet 10. Here, in the ink layer 11A, the gap between the fibers becomes small or easily closed by the hydrophobic ink 2. Therefore, as shown in FIG. 4B, the amount of air passing from the ink portion 11 to the recess S is reduced. On the other hand, since air is easier to pass through the space than the non-woven fabric sheet 10 in which fibers are entangled, air that is difficult to pass through in the thickness direction due to the hydrophobic ink 2 can pass through the recess S in the plane direction P. In addition, since the side wall portion of the recess S is around the ink region IR, air in the recess S easily passes through the non-woven fabric sheet 10 of the non-ink portion 12 through the side wall portion. As a result, the air in the recess S is easily exchanged with the outside through the non-ink portion 12. Therefore, by improving the air permeability around the ink portion 11 by the recess S, it is possible to supplement the air permeability that tends to be lowered by the hydrophobic ink 2. As a result, deterioration of the air permeability of the absorbent article 1 can be suppressed.

Further, when the fiber density of the non-woven fabric sheet 10 in the non-ink region NR is smaller than the fiber density of the non-woven fabric sheet 10 in the ink region IR, the gap between the fibers in the non-ink region NR becomes large. As a result, air can easily pass through in the non-ink region NR around the ink region IR, and by improving the air permeability around the ink portion 11, it is possible to supplement the air permeability that is easily reduced by the hydrophobic ink 2.

Further, the fiber thickness of the non-woven fabric sheet 10 on one side (ink layer 11A side) on which the hydrophobic ink 2 is arranged is the non-woven fabric on the other side (non-ink layer 11B side) on which the hydrophobic ink 2 is not arranged. When it is thicker than the fibers of the sheet 10, the gap between the fibers on one side can be increased. As a result, air can easily pass through the portion close to the hydrophobic ink 2, and deterioration of air permeability can be suppressed.

Further, when the non-woven fabric sheet 10 has a squeezed portion squeezed from the other side (non-ink layer 11B side) on which the hydrophobic ink 2 is not arranged, the gap between the fibers is reduced by squeezing on the other side. .. Therefore, by arranging the hydrophobic ink 2 on one side of the non-woven fabric sheet 10 in which the gap between the fibers is less likely to be reduced by pressing than on the other side, air can easily pass through the portion close to the hydrophobic ink 2 and air is ventilated. It can suppress the deterioration of sexuality.

Further, since the thickness Ti of the non-woven fabric sheet 10 in the ink region IR is thinner than the thickness Tn of the non-woven fabric sheet 10 in the non-ink region NR with the ink boundary as a boundary, the thickness of the non-woven fabric sheet 10 is near the ink boundary. You can change the ink. As a result, the side wall portion of the recess S can be provided from the place where the hydrophobic ink 2 is no longer arranged, so that the air permeability that is easily lowered by the hydrophobic ink 2 can be supplemented. As a result, deterioration of the air permeability of the absorbent article can be suppressed.

Further, as shown in FIG. 5A, when the hydrophobic ink 2 is arranged on the side where the second sheet 13B, which is the contact sheet, is arranged, the recess S causes the first sheet 13A and the second sheet 13B to be connected to each other. Gap (space) is likely to be formed between them. As a result, in the ink region IR, air can easily pass through the space between the first sheet 13A and the second sheet 13B, and deterioration of the air permeability of the absorbent article 1 can be suppressed. In addition, since the hydrophobic ink 2 is not exposed, the hydrophobic ink 2 does not come into direct contact with the wearer's skin, and the hydrophobic ink 2 can be prevented from adhering to the wearer's skin.

Further, as shown in FIG. 5A, the first sheet 13A and the second sheet 13B are non-bonded in at least a part of the ink region IR. As a result, since the first sheet 13A and the second sheet 13B are not joined in at least a part of the ink region IR, the first sheet 13A and the second sheet 13B can be separated from each other in the thickness direction T. is there. In at least a part of the ink region IR, when wrinkles are formed by shrinkage in the shrinkage region CR, the first sheet 13A and the second sheet 13B are easily separated from each other, and the first sheet 13A and the second sheet 13B are separated from each other. You can expand the space. As a result, air can more easily pass through the gap between the first sheet 13A and the second sheet 13B, and deterioration of the air permeability of the absorbent article can be suppressed. In addition, since the ink region IR has higher rigidity than the non-ink region NR, wrinkles are relatively difficult to form in the ink region IR, and the first sheet 13A and the second sheet 13B are in contact with each other. Easy to maintain. Even when the first sheet 13A and the second sheet 13B are in contact with each other, the recess S formed in the first sheet 13A can supplement the air permeability.

Further, as shown in FIG. 5B, at least a part of the hydrophobic ink 2 of the folded-back portion 10f is arranged at a position where it overlaps with the hydrophobic ink 2 of the facing portion 10c in the thickness direction T, so that the ink portions 11 overlap each other. In the area where the inks overlap, a larger space is likely to be formed. As a result, air can more easily pass through the space between the folded-back portion 10f and the facing portion 10c, and deterioration of the air permeability of the absorbent article 1 can be suppressed.

Further, as shown in FIG. 4C, when the hydrophobic ink 2 is arranged on the non-skin surface side T2 of the non-woven fabric sheet 10, excrement can be drawn in the entire surface of the non-woven fabric sheet 10 on the skin surface side T1. In addition, in the ink region IR, even if the ink layer 11A (hydrophobic ink 2) makes it difficult for the excrement E to pass through the non-skin surface side T2 of the non-woven fabric sheet 10, the excrement E passes through the non-ink portion 12. Since it can be moved to the non-skin surface side T2 of the non-woven fabric sheet, deterioration of absorption performance can be suppressed. In particular, when the fiber density of the ink portion 11 is smaller than the fiber density of the non-ink portion 12, the excrement E drawn into the non-ink portion 11B is easily drawn into the non-ink portion 12 due to the capillary phenomenon, so that the absorption speed Can be prevented from decreasing.

Further, since it can be diffused on the surface of the absorber 50 through the recess S, it is possible to prevent a decrease in the absorption speed. In addition, the excrement E absorbed by the absorber 50 is less likely to return to the skin surface side T1 due to the ink layer 11A, so that rewetback can be reduced.

(4) Second Embodiment Next, the second embodiment will be described with reference to FIGS. 6 to 8. FIG. 6 is a schematic plan view of the absorbent article 1 as viewed from the skin surface side. 7 and 8 are schematic cross-sectional views of the absorbent article 1 in the F7-F7 cross section in FIG. FIG. 8 is a diagram for explaining the arrangement relationship of each member, and each member is shown in a simplified manner.

An embodiment will be described by taking a sanitary napkin as an example as an absorbent article according to the second embodiment. The absorbent article 1 is not limited to a sanitary napkin, but may be a panty liner, a light incontinence pad, or the like. The absorbent article 1 may be used by being fixed to an article worn by the user. The description of the same part as that of the first embodiment will be omitted.

The absorbent article 1 has a pair of wings 1W. The pair of wings 1W extend outward in the width direction from the outer edge of the absorber 50 (absorption core) in the width direction W. Therefore, it extends from the central portion in the front-rear direction L to both outer sides in the width direction W. Further, the pair of wings 1W can be folded back when the absorbent article 1 is used.

The absorbent article 1 has a skin surface sheet 41, a second sheet 45, an absorbent body 50, a liquid impermeable sheet 42, and a backside sheet 47.

As shown in FIG. 3, in the thickness direction T, the skin surface sheet 41, the second sheet 45, the absorber 50, the backside sheet 47, and the liquid impermeable sheet 42 are laminated. The skin surface sheet 41, the second sheet 45, the absorber 50, the liquid permeable sheet 42 and the backside sheet 47 are joined and fixed by a joint portion. As the joint, for example, an adhesive HMA such as a hot melt adhesive can be used.

The second sheet 45 may be arranged between the skin surface sheet 41 and the absorber 50. The second sheet 45 is a non-woven fabric sheet, and examples thereof include an air-through non-woven fabric, a spunbonded non-woven fabric, and a spunlaced non-woven fabric.

In the present embodiment, the skin surface sheet 41 and the second sheet 45 are wound together so as to wrap the end portion in the width direction W in an integrated state of being bonded by the adhesive HMA. The skin surface sheet 41 is joined and fixed by the adhesive HMA at the joint portion 84 on the non-skin surface side of the absorber 50. The main body 80 in which the skin surface sheet 41, the second sheet 45, and the absorber 50 are integrated is configured.

In the adhesive HMA that joins and fixes each member to each other, it is not necessary to apply the adhesive to the entire region. In particular, by adjusting the amount and area of the adhesive to be applied as the adhesive HMA between the skin surface sheet 41 and the second sheet 45, and the coating pattern, the pair of main body joints 85 described later in the main body 80 can be used. The flexibility of the outside of the width direction W can be ensured, and the touch can be improved.

The main body joining portion 85 joins the main body portion 80 and the non-skin side sheet. In the present embodiment, the surface of the main body 80 on the non-skin surface side and the surface of the back side sheet 47 on the skin surface side are joined at the main body joint 85 using an adhesive such as hot melt. As shown in FIG. 1, the main body joint 85 has a continuous shape along the front-rear direction L. The main body joint 85 is arranged at both ends in the width direction W. The non-skin-side sheet may be only the liquid-impermeable sheet 42, or may be a combination of the liquid-impermeable sheet 42 and the backside sheet 47.

The skin surface sheet 41 may have a pair of first folded portions 2h whose side ends on both sides in the width direction W are folded back to the non-skin surface side T2. The pair of first folded portions 2h are joined to the back side sheet 47 by the main body joining portion 85. The widthwise tips of the pair of first folded portions 2h may be located inside the widthwise direction W with respect to the outer edge of the main body joint 85. As a result, the tip (edge) of the skin surface sheet 41 (first folded portion 2h) is not exposed. Therefore, since the tip of the skin surface sheet 41 does not hit the wearer's skin, deterioration of the touch can be suppressed.

The second sheet 45 may have a pair of second folded portions 3h whose side ends on both sides in the width direction W are folded back to the non-skin surface side T2.

The backside sheet 47 is a hydrophobic sheet member, and examples thereof include an air-through non-woven fabric, a spunbonded non-woven fabric, and a spunlaced non-woven fabric.

A central adhesive portion 8 to which an adhesive is applied may be provided on the non-skin side surface of the absorbent article 1 (that is, the non-skin side surface of the liquid impermeable sheet 42). When the central adhesive portion 8 is used, the absorbent article 1 is fixed to the underwear or the like by being attached to the skin side surface of the worn article such as underwear. Similarly, a wing adhesive portion 9 is provided on the non-skin side surface (non-skin surface side T2 of the liquid impermeable sheet 42) in the thickness direction T of each wing 1W.

The absorber 50 is a member that absorbs excrement and holds it inside. In the present embodiment, as shown in FIGS. 3, 4, and 6, the absorber 50 may have a first absorption core 51A, a second absorption core 51B, and a cover sheet 52. The first absorption core 51A may have the same configuration as the absorption core of the first embodiment. The second absorbent core 51B may be a sheet-like member in which a highly absorbent polymer (so-called SAP) or the like, which is a liquid absorbent granular material, is sandwiched between a liquid permeable sheet such as a tissue from the skin side surface and the non-skin side surface, respectively. .. The cover sheet 52 is a liquid-permeable sheet member, and examples thereof include an air-through non-woven fabric, a spunbonded non-woven fabric, and a spunlaced non-woven fabric. The cover sheet 52 may be sandwiched between the first absorption core 51A and the second absorption core 51B.

As shown in FIG. 8, the second sheet 45 may have the hydrophobic ink 2. As a result, the excrement can be quickly absorbed by the skin sheet 41, so that the excrement does not continue to remain on the contact surface of the skin sheet 41. Therefore, it is possible to prevent excrement from leaking through the wearer's body. Further, since the skin surface sheet 41 is present on the skin surface side T1 of the second sheet 45 having the hydrophobic ink 2, it is possible to prevent the hydrophobic ink 2 from adhering to the wearer's skin.

As shown in FIG. 6, the absorbent article 1 may be designed by the hydrophobic ink 2. The hydrophobic ink 2 may be arranged on the skin surface side T1 of the second sheet 45. As a result, the design can be made easier to see as compared with the case where the hydrophobic ink 2 is arranged on the non-skin surface side T2 of the second sheet 45.

(5) Example of modification Next, an example of modification will be described with reference to FIG. FIG. 9 is a schematic cross-sectional view of the absorbent article according to the modified example. FIG. 9 is an enlarged schematic cross-sectional view of the center sheet 41A and the absorber 50, similarly to FIGS. 4B and 4C. In the following, the same description as already described will be omitted.

As shown in FIG. 9, the hydrophobic ink 2 may be arranged on the skin surface side T1 of the non-woven fabric sheet 10. In the non-ink region NR, since the non-woven fabric sheet 10 is thick, the excrement E can easily come into contact with the non-woven fabric sheet 10 in the non-ink region NR, and the start of drawing in the excrement E can be accelerated. Further, the excrement E excreted in the ink region IR easily touches the non-ink portion 12 which is the side wall of the recess S, and can reach the absorber 50 via the non-ink portion 12.

When the fiber density of the non-ink portion 12 is smaller than the fiber density of the ink portion 11 (non-ink layer 11B), the excrement E that has begun to be drawn in the non-ink region NR is collected in the ink portion 11 having a high fiber density. Since it can be pulled in by the capillary phenomenon, it is possible to suppress a decrease in the speed at which the excrement E is drawn.

Further, since the hydrophobic ink 2 is arranged on the skin surface side T1 of the non-woven fabric sheet 10, it becomes difficult for excrement to return from the non-woven fabric sheet to the skin surface side in the ink region IR, and rewetback can be reduced.

Further, when the non-woven fabric sheet 10 has a contact surface that comes into contact with the wearer's skin, the hydrophobic ink 2 is arranged on the bottom surface of the recess S, so that the hydrophobic ink does not easily adhere to the wearer's skin. Can be done.

(6) Method for Manufacturing Nonwoven Fabric Sheet Next, a method for manufacturing the nonwoven fabric sheet 10 will be described with reference to FIG. FIG. 10 is a diagram for explaining a method for manufacturing a nonwoven fabric sheet.

The direction in which the component parts are conveyed in the manufacturing process is shown as the transfer direction MD.

As shown in FIG. 10, the non-woven fabric 10C is transported in the transport direction MD. The non-woven fabric 10C may be a continuous sheet in which any of the constituent members composed of the above-mentioned non-woven fabric is continuous.

In step S10, the hydrophobic ink 2 is placed on the non-woven fabric 10C. The hydrophobic ink may be arranged by applying the hydrophobic ink 2 to the non-woven fabric 10C using the coating device 210. The method of applying the hydrophobic ink 2 may be flexographic printing or gravure printing. The coating device 210 may be composed of a pair of upper and lower rolls. By passing the non-woven fabric 10C through the gap between the rolls, the hydrophobic ink 2 on at least one roll may be applied to the non-woven fabric 10C.

The hydrophobic ink 2 is an ink that is cured by ultraviolet rays (UV). Therefore, the hydrophobic ink 2 may contain a material that is cured by ultraviolet rays.

In step S20, at least the ink region IR in which the hydrophobic ink 2 is arranged is irradiated with ultraviolet rays.

As shown in FIG. 10, the irradiation device 220 can be used to irradiate the ink region IR with ultraviolet rays. In the ink region IR where the hydrophobic ink 2 is arranged, the air between the irradiation device 220 and the non-woven fabric 10C is warmed by irradiating with ultraviolet rays. Since the air between the fibers of the non-woven fabric is warmed by the warmed air, the bulk of the non-woven fabric 10C increases. However, in the ink region IR, the hydrophobic ink is cured and dried by irradiating with ultraviolet rays. As a result, the hydrophobic ink 2 joins the fibers of the non-woven fabric 10C to each other, making it difficult for the fibers of the non-woven fabric 10C to separate from each other. As a result, even if the air between the fibers of the non-woven fabric 10C in the ink region IR is warmed, the bulk of the non-woven fabric sheet 10 is unlikely to increase. In addition, since the energy generated by the ultraviolet rays applied to the ink region IR is used to cure the hydrophobic ink, it is difficult to warm the air between the fibers of the non-woven fabric 10C in the ink region IR. As a result, the thickness of the non-woven fabric 10C in the ink region IR can be made thinner than the thickness of the non-woven fabric 10C in the non-ink region NR.

Further, in step S20, the non-ink region NR around the ink region IR may be irradiated with ultraviolet rays. As a result, in the non-ink region NR, the ultraviolet energy may be converted into heat energy to further warm the air between the fibers of the non-woven fabric. As a result, the bulk of the non-woven fabric 10C is further increased in the non-ink region NR.

The irradiation device 220 may irradiate not only ultraviolet rays but also infrared rays. As a result, the non-woven fabric 10C can be heated, so that the air between the fibers can be further heated. Further, not only the irradiation device 220 but also the heating device may be used to heat the air between the fibers of the non-woven fabric 10C. As a result, the bulk of the non-woven fabric 10C in the non-ink region NR can be further increased.

In step S20, the hydrophobic ink 2 may be arranged on the surface on the side where the fiber thickness is thick. The thickness of the fiber on the side where the hydrophobic ink 2 is arranged may be thicker than the thickness of the fiber on the side where the hydrophobic ink 2 is not arranged. As a result, as shown in FIG. 10, when ultraviolet rays are irradiated from the surface side on which the hydrophobic ink 2 is arranged, the thicker the fiber, the larger the volume, so that the depth of the recess S can be increased. it can. As a result, by improving the air permeability around the ink portion 11 by the recess S, it is possible to supplement the air permeability that tends to be lowered by the hydrophobic ink 2.

In step S10, the bulk of the nonwoven fabric 10C may be reduced by being sandwiched between the pair of rolls by being applied by the pair of rolls. By step S20, the bulk of the non-woven fabric sheet 10 may be restored in the non-ink region NR. On the other hand, in the ink region IR, the bulk of the non-woven fabric sheet 10 does not have to recover up to the stage prior to step S10.

Since the hydrophobic ink 2 is an ink that is cured by ultraviolet rays, the hydrophobic ink can be dried by irradiating with ultraviolet rays. As a result, the drying time can be shortened as compared with the case of drying without irradiating with ultraviolet rays. As a result, it is not necessary to lengthen the transport path for drying, the size of the manufacturing apparatus can be suppressed, and the manufacturing time can be shortened.

After that, by cutting the non-woven fabric 10C, it is possible to manufacture the non-woven fabric sheet 10 capable of suppressing deterioration of the air permeability of the absorbent article 1. The absorbent article 1 can be produced by using the produced nonwoven fabric sheet 10.

(7) Other Embodiments Although the present invention has been described in detail using the above-described embodiments, the present invention is not limited to the embodiments described in the present specification for those skilled in the art. Is clear. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.

For example, in the above-mentioned second embodiment, the hydrophobic ink 2 is arranged on the skin surface side T1 of the second sheet 45, but the present invention is not limited to this. The hydrophobic ink 2 may be arranged on the non-skin surface side T2 of the second sheet 45. As a result, a recess S (space) is likely to be formed between the absorber 50 and the second sheet 45, and the absorber 50 is likely to bend in a convex shape along the wearer's body in accordance with the movement of the wearer. can do. As a result, the absorber 50 becomes difficult to separate from the wearer's body, and leakage of excrement can be reduced.

The above-described embodiments, modifications, and configurations of the absorbent articles according to the other embodiments can be combined as appropriate. For example, for a napkin such as the second embodiment, a non-woven fabric sheet having the hydrophobic ink 2 can be used as in the first embodiment.

1: Absorbent article 10: Non-woven sheet 11: Ink part 11A: Ink layer 11B: Non-ink layer 12: Non-ink part 13: Composite sheet 13A: First sheet 13B: Second sheet 15: Exterior body 20: Front exterior body 30: Rear exterior body 40: Absorbent body 41: Skin surface sheet 41A: Center sheet 41B: Side sheet 42: Liquid permeable sheet 43: Body sheet 50: Absorbent IR: Ink area NR: Non-ink area S1: Front side Area S2: Rear area S3: Inseam area T: Thickness direction T1: Skin surface side T2: Non-skin surface side W: Width direction

Claims (14)

An absorbent article comprising a non-woven fabric sheet with hydrophobic ink.
In a plan view of the nonwoven fabric sheet, the nonwoven fabric sheet is provided with an ink region in which the hydrophobic ink is arranged and a non-ink region in which the hydrophobic ink is not arranged.
An absorbent article in which the thickness of the nonwoven fabric sheet in the ink region is thinner than the thickness of the nonwoven fabric sheet in the non-ink region. The hydrophobic ink is arranged on one side of the nonwoven fabric sheet in the thickness direction.
The absorbent article according to claim 1, wherein a recess recessed in the thickness direction from the periphery of the ink region is provided on one side of the nonwoven fabric sheet. The absorbent article according to claim 1 or 2, wherein the fiber density of the non-woven fabric sheet in the non-ink region is smaller than the fiber density of the non-woven fabric sheet in the ink region. The hydrophobic ink is arranged on one side of the nonwoven fabric sheet in the thickness direction.
The absorbent article according to any one of claims 1 to 3, wherein the thickness of the fiber on one side of the non-woven fabric sheet is larger than the thickness of the fiber on the other side of the non-woven fabric sheet. The hydrophobic ink is arranged on one side of the nonwoven fabric sheet in the thickness direction.
The absorbent article according to any one of claims 1 to 4, wherein the non-woven fabric sheet has a squeezed portion squeezed from the other side of the non-woven fabric sheet in the thickness direction. It has an abutting sheet that comes into contact with one side of the non-woven fabric sheet in the thickness direction.
The absorbent article according to any one of claims 1 to 5, wherein the hydrophobic ink is arranged on one side of the non-woven fabric sheet. It has a composite sheet including a contact sheet that comes into contact with one side of the nonwoven fabric sheet in the thickness direction and the nonwoven fabric sheet.
The composite sheet has a shrinkage region in which the non-woven fabric sheet and the contact sheet shrink.
At least a part of the ink region overlaps the shrinkage region in the thickness direction.
The absorbent article according to any one of claims 1 to 6, wherein the non-woven fabric sheet and the contact sheet are not bonded to each other in at least a part of the ink region. The non-woven fabric sheet is
The folded portion where the non-woven fabric sheet is folded and
It has an opposing portion that faces the folded portion and is in contact with the folded portion.
The absorbency according to any one of claims 1 to 7, wherein at least a part of the hydrophobic ink in the folded portion is arranged at a position overlapping the hydrophobic ink in the facing portion in the thickness direction. Goods. It is arranged on the non-skin surface side of the non-woven fabric sheet, and has an absorber that overlaps the ink region and the non-ink region in the thickness direction.
The hydrophobic ink is arranged on the non-skin surface side of the non-woven fabric sheet.
The absorbent article according to any one of claims 1 to 8, wherein the fiber density of the non-woven fabric sheet in the non-ink region is smaller than the fiber density of the non-woven fabric in the ink region. It is arranged on the non-skin surface side of the non-woven fabric sheet, and has an absorber that overlaps the ink region and the non-ink region in the thickness direction.
The hydrophobic ink is arranged on the skin surface side of the non-woven fabric sheet.
The absorbent article according to any one of claims 1 to 8, wherein the fiber density of the non-woven fabric sheet in the non-ink region is smaller than the fiber density of the non-woven fabric sheet in the ink region. An absorber that is arranged on the non-skin surface side of the non-woven fabric sheet and that overlaps the ink region and the non-ink region in the thickness direction.
A skin surface sheet having an abutting surface that comes into contact with the wearer's skin.
The absorbent article according to any one of claims 1 to 10, wherein the non-woven fabric sheet is arranged between the skin surface sheet and the absorber in the thickness direction. Any of claims 1 to 11, wherein the thickness of the nonwoven fabric sheet in the ink region is thinner than the thickness of the nonwoven fabric sheet in the non-ink region with the boundary between the ink region and the non-ink region as a boundary. Or the absorbent article according to item 1. A non-woven fabric sheet having hydrophobic ink and used for absorbent articles.
In a plan view of the nonwoven fabric sheet, the nonwoven fabric sheet is provided with an ink region in which the hydrophobic ink is arranged and a non-ink region in which the hydrophobic ink is not arranged.
A non-woven fabric sheet in which the thickness of the non-woven fabric sheet in the ink region is thinner than the thickness of the non-woven fabric sheet in the non-ink region. A method for manufacturing a non-woven fabric sheet used for an absorbent article.
The process of arranging hydrophobic ink that is cured by ultraviolet rays on the non-woven fabric,
A method for producing a nonwoven fabric sheet, comprising a step of irradiating at least the ink region on which the hydrophobic ink is arranged with ultraviolet rays.

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