RU2713974C1 - Absorbent product - Google Patents

Abstract

FIELD: hygiene.

SUBSTANCE: according to the present invention, an absorbent article comprising a fluid-permeable upper surface sheet (14), liquid-impermeable, a lower surface sheet (12) and absorbing component (13) located between upper surface sheet (14) and lower surface sheet (12). Plurality of pressed rows (22) consisting of multiple recessed parts (21) are located on absorbing component (13), multiple buried parts (21) are formed by means of compression of upper surface sheet and absorbing component (13) together, multiple pressed rows intersect each other. Zones (25) of intersected pressed rows (22) and/or parts around zones (25) of intersection are made with sections (23) with low surface density.

EFFECT: object of the present invention is to provide an absorbent article in which when forming an embossed pattern in the form of a grating on an absorbent component, a situation is prevented wherein the intersection and/or part areas around the intersection areas become solid, and enabling their bending to create a better sense of use (soft sensation).

6 cl, 11 dwg

Description

FIELD OF THE INVENTION

[0001] The present invention relates to an absorbent article and, in particular, relates to a disposable diaper and absorbent pad.

State of the art

[0002] Various improvements have been made to an absorbent article such as a disposable diaper (hereinafter also referred to simply as a “diaper”) to improve its functioning and increase wearing comfort.

[0003] An absorbent article absorbs most of the body fluid by using an absorbent component. Since the diaper covers the abdomen, buttocks and inguinal part, various movements of the body, such as walking, turning and crawling the baby, in particular leg movements, affect the diaper. In particular, the absorbent component sometimes twists, bends, or breaks due to various body movements. In this case, the fit of the diaper to the groin is reduced, and there is a likelihood of fluid leakage. In addition, with an increase in the percentage of ultra-high absorbency polymer (hereinafter, also referred to as “SAP”) contained in the absorbent component, there is a tendency for the absorbent component to lose flexibility in absorbent component.

[0004] In view of this, as described in Patent Literature 1, there is an absorbent component in which the side of the skin contacting surface of the absorbent component is embossed to form an oblique lattice pattern of depressed grooves extending obliquely with respect to the direction from the front main part to the back of the diaper. Embossing an absorbent component similar to that described above improves the fit of the diaper to the groin by ensuring that the diaper “repeats” leg movements back and forth and bends of the buttocks, and suppresses leakage of fluid from the body.

[0005] Furthermore, the embossing described above is performed by rotating the embossing roller on a long sheet of absorbent component, wherein the embossing roller has a surface with a protruding embossing relief. In the manufacture of a diaper, a long sheet of absorbent component or the like is embossed by rotating the embossing roller on an absorbent component sheet or the like, after which operations such as stacking various sheets on top of each other in the form of a stack are performed, and sheets stacked in the stack are cut out. with the necessary size.

List of links

Patent Literature

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2015-016218

SUMMARY OF THE INVENTION

Technical problem

[0007] In order to prevent the grooves from losing their characteristics when pressure is applied to them due to the mass of the carrier body, indented grooves are formed formed by compressing the absorbent component and the upper surface sheet (upper sheet) located on the side of the surface of the absorbent component in contact with the skin, together on the side top surface sheet to reduce the likelihood of grooves losing their characteristics. Also in this case, the depressed grooves are formed by rotating the embossing roller on the absorbent component onto which the upper surface sheet is superimposed as described above. When the indented grooves are formed as described above, the rotation of the embossing roller causes the upper surface sheet and the like to be placed in layers on top of the absorbent component into the grooves, and there is a tendency for the upper surface sheet to be highly tensioned. In particular, an embossed pattern with components extending in oblique directions, such as an oblique lattice pattern, includes parts such as parts adjacent to the lattice assemblies in which the distance (interval) between simultaneously squeezed places is small. When the distance between the simultaneously squeezed places is small, a large force acts on the upper surface sheet, causing the upper surface sheet to be pulled away from both adjacent pressed places, and there is a tendency for the upper surface sheet to be highly tensioned. In this case, the powdered SAP in the absorbent component comes into contact with the upper surface sheet, and the probability of rupture of the upper surface sheet in the intersection zones during embossing increases.

[0008] In addition, the depressed grooves are located under parts that are not compressed, and therefore are not in direct contact with the skin of the wearer. However, in parts near the nodes of the lattice, that is, in the intersection zones in the lattice and / or in the parts around the intersection zones, the upper surface sheet and the absorbent component are fastened while being tensioned and under high tension. Accordingly, the powdered SAP in the absorbent component sometimes comes into contact with the upper surface sheet. In this case, the intersection zones in the lattice and / or the parts around the intersection zones on the surface of the upper surface sheet in contact with the skin will be harder than the other parts, and, for example, the carrier may feel a roughness of the polymer with ultra-high absorbency when touched.

[0009] When the intersection zones in the lattice come into contact with the skin of the wearer, the intersection zones create a feeling of hardness and roughness to the touch of the wearer, and this is unfavorable. In particular, since the diaper comes in contact with the part with sensitive skin, such as the groin, a soft touch is desirable, and the sensation of the diaper coming in contact with the skin is unfavorable when the intersection zones in the lattice are hard.

[0010] The present invention has been made in view of the above problems, and its object is to provide an absorbent article in which, when forming an embossed lattice pattern on an absorbent component, a situation is avoided in which the intersection zones and / or parts around the intersection zones become hard, and it is possible to bend them to create a better feeling in use by the wearer (soft feeling).

Solution

[0011] To solve the above problem, the absorbent article according to the present invention is an absorbent article including a liquid permeable, upper liquid impermeable surface sheet, a lower surface sheet and an absorbent component located between the upper surface sheet and the lower surface sheet, however, a plurality of pressed rows consisting of a plurality of recessed parts are located on the absorbent component, a plurality of recessed parts are formed by ohm squeezing absorbent component, a plurality of series of compressed intersect with each other, and wherein the intersection zone extruded series and / or around the intersection part zones made with areas of low surface density.

Preferred Effects of the Invention

[0012] As described above, in accordance with the present invention, an absorbent article can be provided in which when forming an embossed lattice pattern on the absorbent component, the likelihood of rupture of the intersection zones and / or parts around the intersection zones is reduced, and they are not hard and lend themselves to bending to create a better feeling in the wearer when used (softness and lack of roughness).

Brief Description of the Drawings

[Fig. 1] Fig. 1 is a three-dimensional projection illustrating the appearance of an embodiment in which the absorbent article of the present invention is used as a folding disposable diaper;

[Fig. 2] Fig. 2 is a partially cutaway plan view in which the diaper illustrated in Fig. 1 is folded out and shown from the side of the skin contacting surface;

[Fig. 3] Fig. 3 is a sectional view in which the diaper illustrated in Fig. 2 is cut along line III-III;

[figure 4] figure 4 is a three-dimensional projection illustrating the diaper illustrated in figure 1, in the unfolded state and with a spatial separation of the elements;

[Fig. 5] Fig. 5 is a partial top view of the absorbent part of the diaper illustrated in Fig. 1, when viewed from the side of the top sheet;

[Fig.6] Fig.6 is an enlarged partial top view illustrating part of the pressed rows of Fig.5 in an enlarged view;

[Fig. 7] Fig. 7 is a sectional view taken along line VII-VII in Fig. 6;

[Fig. 8] Fig. 8 is a sectional view taken along line VIII-VIII in Fig. 6;

[Fig. 9] Fig. 9 is a sectional view taken along line IX-IX in Fig. 6;

[Fig. 10] Fig. 10 is a sectional view taken along line X-X in Fig. 6; and

[Fig. 11] Fig. 11 is a sectional view taken along line X-X in Fig. 6 in a modified example of the present invention.

Description of Embodiment

[0014] An embodiment of the present invention is described below in detail with reference to the drawings. However, the present invention is not limited to this embodiment, and includes other absorbent articles consistent with the idea of the present invention.

[Embodiment 1]

[0015] FIG. 1 illustrates a perspective view of a foldable disposable diaper (a so-called disposable diaper fastened with ribbons) according to Embodiment 1 of the present invention, seen from the front. FIG. 2 illustrates a plan view of the diaper illustrated in FIG. 1 when viewed from the side of the skin contact surface. FIG. 3 illustrates a cross-sectional view taken along the dashed line III-III in FIG. 2. In addition, FIG. 4 illustrates a split state in which the foldable disposable diaper illustrated in FIGS. 1 and 2 is divided into parts and laid out.

[0016] An expandable disposable diaper 10 (hereinafter referred to simply as a diaper in some cases) in an embodiment includes a front main zone 10F, a rear main zone 10R and an inguinal zone 10C that connects the front main zone 10F and the rear main zone 10R. In addition, the front main zone 10F and the rear main zone 10R form a waist opening 10W that surrounds the waist of the wearer when wearing the diaper 10. Similarly, the inguinal zone 10C and the lower end portions of the front main zone 10F and the rear main zone 10R form two holes 10L for the right and left legs that surround the femoral parts of both legs of the wearer.

[0017] When wearing the diaper 10, the front main zone 10F is located on the abdomen side of the wearer, and the rear main zone 10R is located on the back side of the wearer. In addition, the inguinal zone 10C covers the groin of the wearer and the legs of the wearer are inserted into the two openings 10L for the left and right legs. Accordingly, leg openings 10L are located between the groin and the hips of both legs of the wearer.

[0018] A line running along the central axis of the wearer's body from the head to the groin when the wearer wears the diaper 10 in the proper direction is called the virtual line P and is used, if necessary, in the description below. As illustrated in FIG. 1, the virtual line P extends from the side of the abdomen to the side of the back through the inguinal part in the central part of the diaper 10. In particular, if we assume that, for example, the waist side of the diaper 10 is the upper side and the side of the inguinal zone of the diaper 10 represents the lower side, the virtual line P runs up and down along the surface of the diaper 10, passes through the inguinal part and passes in the up and down direction also from the back. In other words, the up-down direction is the direction along the central axis of the wearer's body extending from the head to the groin, and the virtual line P runs along the central axis of the body.

[0019] Two fastener tapes 10A, namely, left and right fastener tapes 10A, are attached to the cover sheet 11 located on the outside of the diaper 10, in the left and right end edge portions of the rear main zone 10R, while the fastener tapes 10A enable formation leg openings 10L by overlaying them over the left and right end edge parts of the front main zone 10F and attaching to these parts of the front main zone 10F when wearing the diaper 10. The fastening tapes 10A can be repeatedly attached us to overlay the front sheet 10B and separated from the front sheet 10B lining attached to the covering sheet 11 in the front body 10F zone. In addition, an elastic sheet 10D that extends in the width direction of the cover sheet 11 and which provides the wearer with proper wearing comfort around the waist is attached to the cover sheet 11 at the upper end portion of the rear main zone 10R.

[0020] As illustrated in FIGS. 2-4, the diaper 10 in the embodiment is a diaper in which a liquid-impervious cover sheet 11, a lower sheet (lower surface sheet) 12, an absorbent component 13, wrapped in a wrapper 15 for core (thin paper), which is a hydrophilic thin sheet (hereinafter also referred to as simply absorbent component 13) and the upper sheet (upper surface sheet) 14, configured to come into contact with the skin of the carrier, superimposed on each other and connected together in this order from the side external to the skin of the wearer.

[0021] Two cutouts 11A having semicircular shapes and intended to form leg openings 10L are formed in the covering sheet 11 on the left and right sides of the inguinal zone 10C. Impervious to liquids, the bottom sheet 12 is attached to the cover sheet 11, and the aforementioned absorbent component 13 is located between the bottom sheet 12 and the liquid-permeable top sheet 14. The top sheet 14 is attached to the bottom sheet 12 by the absorbent component 13. Rubber threads 16 for the formation of the peripheral assemblies for the legs are attached in a stretched state near the centers of the left and right parts of the bottom sheet 12, edge in the width direction.

[0022] Two liquid-impermeable (or hydrophobic) side sheets 18 configured to form protruding assemblies are provided on the left and right sides of the liquid-permeable top sheet 14, edge in the width direction, in the embodiment. The outer end edge parts of the two side sheets 18 are formed with the same shapes as the two cutouts 11A of the cover sheet 11 and are elements that rise along the left and right edge parts of the absorbent component 13 when wearing the diaper 10 to prevent leakage of urine excreted by the wearer in the lateral direction. In each of the two side sheets 18, the rubber threads 19, which are elastic elements of the protruding assemblies, are placed in a stretched state, with the inner end edge portion of the side sheet 18 being bent toward the absorbent component 13 to hold the rubber threads 19. When tightening the rubber threads 19, the side sheets 18 rise in the direction of contact with the skin of the wearer. The protruding assemblies may have a well-known configuration used in a conventional disposable diaper. For example, protruding assemblies can be formed by placing and securing stretched elastic elements of protruding assemblies between layers of a water-repellent sheet. As illustrated in FIG. 2, the side sheets 18 are pulled together in the longitudinal direction by stretching and pulling together the rubber threads 19. Moreover, as illustrated in FIG. 3, the side sheets 18 form protruding assemblies, the inner end edge parts of which are raised.

[0023] It should be noted that in the diaper 10 of the embodiment, the long side of the absorbent component 13 extends along the virtual line P, and the longitudinal direction of the absorbent component 13 is parallel to the virtual line P. In addition, the direction orthogonal to the virtual line P is a width direction . It should be noted that the ratio of the size of the diaper 10 in the longitudinal direction to the size in the width direction is not limited to the ratio in the embodiment. This ratio can be changed accordingly depending on the shape of the carrier.

[0024] The following describes the structure of the absorbent portion in an embodiment.

[0025] FIG. 5 is a partial top view on which the part in which the absorbent component 13 and the topsheet 14 are located is visible from the side of the topsheet 14.

[0026] The absorbent component 13 of the embodiment, located under the top sheet 14, is formed mainly of cellulose (indicated by 29 in Figs. 7 and 8, which will be described later) and SAP (indicated by 27 in Fig. 7 and 8, which will be described later). The absorbent component 13 has a long narrow shape, extends in the anterior main zone, inguinal zone and posterior main zone and is divided into three parts, namely the front main part M1, the inguinal part M2 and the rear main part M3. Two notches 13A having arcuate shapes are formed in the inguinal part M2 so that they correspond to two holes 10L for the left and right legs surrounding the femoral parts of both legs. It should be noted that the cutouts 13A need not be formed depending on the size of the absorbent component 13. In addition, despite the fact that the absorbent component 13 in the embodiment is made with cutouts 13A and has an hourglass shape in which the width of the central part is less than the width on the front and rear ends, the shape of the absorbent component in the present invention is not limited to this shape. If we assume that the direction from the front main part to the rear main part represents the forward-backward direction (up-down) and the direction orthogonal to it represents the left-right direction, the absorbent component may take, for example, various forms, including the shape in which the angular parts at the front and rear (upper and lower) ends are rounded, the shape of an ellipse extending in the front-back (up-down) direction, a round shape, a rectangular shape with approximately the same length in the forward- Azad (up-down) and the length in the left-right direction and the like shapes.

[0027] In addition, the absorbent component 13 is wrapped in a core wrapper 15, which is, for example, a hydrophilic thin sheet, the end parts of which are connected by adhesive to maintain its shape. An absorbent component 13 wrapped in a core wrapper 15 is located between the lower sheet 12 and the upper sheet 14. The upper sheet 14 is attached to the lower sheet 12 by an absorbent component 13 wrapped in the core wrapper 15. It should be noted that, although the absorbent component 13 wrapped in the core wrapper 15 is used in the embodiment, the absorbent component of the present invention may not be wrapped in the core wrapper.

[0028] Moreover, as illustrated in FIG. 5, the diaper 10 has an extruded part formation zone N1 (an embossed pattern formation zone) formed by squeezing by embossing at equal intervals from the surface of the top sheet 14 towards the absorbent component 13. A plurality of pressed rows 22 are arranged so that they extend in the area N1 of the formation of the pressed parts. Each of the pressed rows 22 is constituted by a plurality of recessed portions 21 formed continuously by compression, and in the pressed rows 22, a plurality of recessed portions 21 are arranged to form an oblique lattice pattern. Many of the pressed rows 22 intersect with each other. In addition, in those zones of the formation zone of the pressed parts in which the pressed rows 22 are not formed, substantially uncompressed / non-pressed main absorbent zones 26 are provided. It should be noted that, as illustrated in FIG. 5, no embossed pattern is formed at both end parts of the absorbent component 13. Accordingly, in the absorbent component 13 of the zone N2 without the formation of pressed parts (zones without the formation of an embossed pattern) are provided on both sides of the zone N1 of the formation of pressed parts (zone of formation embossed pattern). This is intended to prevent the body fluid from draining down along the embossed pattern and leaking from the leg openings 10L.

[0029] In an embodiment, the embossed pattern is formed up to the upper end portion of the front main part M1 and to the lower end part of the rear main part M3. The formation of an embossed pattern to the upper and lower ends, as described above, provides improved ventilation of the diaper 10 and facilitates the bending of the absorbent component 13 to ensure the effect of the diaper 10 adhering to the body of the carrier. It should be noted that in the present invention, a variant is admissible in which the embossed pattern is formed not to the upper end part of the front main part M1 and not to the lower end part of the rear main part M3 of the absorbent component 13, and the variant in which the embossed pattern is formed to the left and right the ends of the absorbent component 13.

[0030] The recessed portions 21 in the embodiment have an inclination relative to a virtual line P extending along the central axis of the wearer's body when wearing the diaper 10. In particular, the recessed portions 21 include a recessed portion 21a having a right inclination that is inclined at a predetermined angle α in 5 to the first direction, which is the right direction in FIG. 5, relative to the virtual line P, and the recessed portions 21b having a tilt to the left, which are tilted at a predetermined angle β in a second direction, representing for example left side in FIG. 5, relative to the virtual line P. In addition, the recessed parts 21 having an inclination in the same direction are arranged so as to form rows, and the diagonal of each square in the lattice has a length L1 and form an embossed one. a lattice pattern in which the recessed portions 21 extend obliquely. Despite the fact that the values of the given angle α and the given angle β are the same in the embodiment, these values may be different. In an embodiment, a plurality of recessed portions 21 are formed by squeezing / compressing the top sheet 14, the core wrap 15, and the absorbent component 13 together toward the top sheet 14. In the present invention, embossing can be performed so that the absorbent component 13 and the top sheet 14 will be embossed together, as in the embodiment, or in such a way that the absorbent component 13 will be embossed and then the top sheet 14 will be attached to the embossed absorbent component 1 3.

[0031] As illustrated in FIG. 5, rows in which a plurality of recessed parts 21a having a right alignment are aligned are called first pressed rows 22a, and rows in which a plurality of recessed parts 21a having a left alignment are aligned are called second extruded rows 22b . These extruded rows 22 have straight lines with an inclination relative to the virtual line P at the same angles as the angles of inclination of the recessed parts 21. The first extruded rows 22a extend parallel to each other at intervals S1. In addition, the second extruded rows 22b extend parallel to each other at intervals S2. An embossed oblique lattice pattern is formed due to the fact that the first extruded rows 22a and the second extruded rows 22b extend as described above. In an embodiment, intersection zones 25 are formed by ensuring that the first extruded rows 22a and the second extruded rows 22b intersect with each other. Although the values of the intervals S1 and S2 are the same in the embodiment, these values may be different.

[0032] Furthermore, the intersection zones 25 of the pressed rows 22 and / or the parts around the intersection zones 25 are formed with low surface density portions 23. 6 is a schematic diagram illustrating a portion of the pressed rows in part VI of FIG. 5 in an enlarged view. 5 and 6, the side sheets 18 are omitted from the illustration for convenience. Sections 23 with low surface density are illustrated by dash-dotted lines with two strokes in FIGS. 5 and 6. Sections 23 with low surface density are formed by adjusting the surface densities of cellulose and SAP forming the absorbent component 13 to a low surface density in the manufacture of the absorbent component 13.

[0033] As illustrated in FIG. 6, the intersection zones 25 in an oblique lattice pattern formed of the first pressed rows 22a and the second pressed rows 22b are formed on the surface of the absorbent component 13 in the embodiment. In addition, a plurality of low surface density portions 23, which are zones including a plurality of intersection zones 25, are formed on the surface of the absorbent component 13 so that they extend in the length direction (longitudinal direction) of the absorbent component 13.

[0034] The low surface density portions 23 of the embodiment are parallel to each other at intervals L2. However, portions 23 with low surface density are not limited to portions parallel to each other, and should only be provided in intersection zones 25 and / or parts around intersection zones 25. In particular, various options can be used provided that zones with a lower surface density than the parts located around these zones are formed so that they at least partially overlap the intersection zones 25 and / or the parts around the intersection zones 25 .

[0035] The low surface density portions 23 are arranged so that they include intersection zones 25 as described above. In an embodiment, when squeezing the absorbent component 13, the parts in which the areas 23 with low surface density are formed are compressed when the buried parts 21 are formed in the intersection zones 25. However, the density in these pressed portions in which the low surface density portions 23 are formed is low. Accordingly, the density of the absorbent component 13 in the areas 23 with a low surface density in the intersection zones 25 is lower than the density of the absorbent component 13 in the areas in which the pressed rows 22 are formed, except for the areas 23 with a low surface density.

[0036] In the embodiment illustrated in FIG. 5, low surface density portions 23 include vertical low surface density portions 23c formed parallel to an imaginary line P. Rows in which a plurality of vertical low surface density portions 23c are located are called rows 24c with low surface density. Although the low surface density portions 23 are arranged in the form of a vertical strip pattern in an embodiment, the present invention is not limited to this arrangement, and the width of each vertical strip in an embodiment can be increased or decreased, provided that the low portions 23 surface density will be located so that they will include the zone 25 of the intersection and / or parts around the zone 25 of the intersection. In addition, sections 23 with low surface density can have different shapes, for example, the shape of a quadrangle, circle, ellipse and triangle.

[0037] The low surface density portions 23 in the embodiment are formed, for example, in steps (1) to (6) described below. An absorbent mat (refers to an absorbent core that does not include a core wrapper in the steps below) is formed by mixing cellulose and powdered SAP and spraying the mixture in the direction, for example, to filters of two forming drums.

(1) First, a constant thickness absorbent mat is formed using the first forming drum.

(2) Next, an absorbent mat is formed at intervals using a second shaping drum, so that air passage holes are formed in parts corresponding to the low surface density portions 23, and this absorbent mat is to be applied to the absorbent mat formed in step ( 1). By this, an absorbent mat with recesses is formed.

(3) Thereafter, the absorbent mat with recesses on which the cellulose layer is applied is wrapped with a core wrapper 15, and the core wrapper 15 and the absorbent mat are attached to each other by hot-melt adhesive or the like to form the absorbent component 13.

(4) The formed absorbent component 13 is cut out according to the size of one diaper.

(5) The top sheet 14 is applied to the cut-out absorbent component 13.

(6) The top sheet 14 and the absorbent component 13 are pressed together by means of an embossing roller.

[0038] The core wrapper 15 is attached to the lower parts of the recesses by moving the absorbent component 13 by suction in step (3), embossing in step (6) or the like, and low surface density portions 23 are formed, for example, with the shape illustrated in Fig.8, which will be described later. It should be noted that in the present invention, areas 23 with a low surface density can be made by using two forming drums, as in an embodiment, or made by embossing. For example, intersection zones 25 are performed with low surface density sections 23 by squeezing them so that the material of the absorbent component 13 in the intersection zones 25 “ diverges ” into parts around them.

[0039] The shorter the distance to the pressed part in the intersection zones 25 of the recessed parts 21, the higher the degree of tension. Accordingly, it is preferable to reduce the surface density depending on a given distance for reasons related to reducing the likelihood of tearing of the top sheet 14. Thus, the low surface density portions 23 are preferably formed so that the surface density in the low surface density portions 23 decreases in the direction to the center of each intersection zone 25 (for example, with a cone shape). This configuration prevents a situation in which the intersection zones 25 become hard. Accordingly, it is possible to reduce the likelihood of rupture of the top sheet 14, and also make the diaper 10 bendable in both directions along each of the recessed parts 21, that is, along the axes extending in the directions in which the lattice lines extend, and improve fit.

[0040] In an embodiment, the recessed portions 21 of the embossed pattern in the form of an oblique lattice are formed by pressing the embossing roller having a surface on which a relief corresponding to the recessed parts 21 is formed when the embossing roller is rotated. As illustrated in FIG. 5, when the embossing roller moves in the direction of the arrow W (direction from the front main part M1 to the rear main part M3) when it is rotated, all portions of the recessed parts 21 are aligned, aligned in a direction orthogonal to the direction of movement W embossing roller. Although the size of the embossing roller is set such that the circumference of the embossing roller is equal to the length of the absorbent component 13 in the longitudinal direction in the embodiment, the size of the embossing roller is not limited to this.

[0041] It should be noted that in the embodiment, the embossing roll movement direction W is parallel to the direction of the aforementioned imaginary line P when the diaper 10 is completed. As described above, the top sheet 14 is superimposed on an absorbent component 13 cut in accordance with the size of the diaper 10, and the top sheet 14 and the absorbent component 13 are pressed together using an embossing roller. Since the absorbent component 13 is cut with a length “covering” the front main part, the inguinal part and the rear main part of the diaper 10, an embossed oblique lattice pattern inclined relative to an imaginary line P can be formed by setting the embossing roll direction W to be parallel imaginary line P. Since the direction W of movement of the embossing roller and the direction in which sections 23 with low surface density pass are parallel to each other in the embodiment eniya, a plurality of zones of intersection 25 can easily be aligned with areas 23 of low surface density.

[0042] Accordingly, each recessed portion 21a having a right inclination is inclined to the right also with respect to the moving direction W, and each recessed part 21b having the left inclination is inclined to the left also with respect to the moving direction W. Accordingly, as the embossing roller moves in the moving direction W, the distance between the right inclined recess 21a and the left inclined recess 21b adjacent to each other decreases toward the intersection zone 25.

[0043] In this case, when squeezing the embossing roller to form the recessed parts 21, the top sheet 14 is stretched to “draw” it into the recessed parts 21. Since it has a slope to the right, a recessed part 21a, and a slope to the left, a recessed part 21b adjacent another, are formed by simultaneous squeezing, the top sheet 14 between these parts is stretched left and right. In particular, FIG. 6 shows the pulling forces acting in the left and right directions, which are illustrated by arrows A and which are simultaneously applied to the top sheet 14 and cause the top sheet 14 to stretch. As the distance between the tilted to the right, the recessed part 21a and has tilting to the left, with the recessed portion 21b adjacent to each other, decreases the tensile strength of the top sheet 14 by the pulling forces A, and thus the top sheet 14 becomes highly stretched. Accordingly, the SAP in the absorbent component 13 comes into contact with the topsheet 14, and this leads to the fact that the surface of the topsheet 14 creates a rough feeling when touched / to the touch. This causes irritation to the skin of the wearer and is therefore not preferred.

[0044] Furthermore, when the embossing roller is pressed deeply to form the recessed portions 21, the top sheet 14 is further stretched and therefore may break. However, when the recessed portions 21 are formed simply by slightly squeezing by means of an embossing roller, a weak / weak connection occurs between the top sheet 14 and the absorbent component 13. Accordingly, there is a possibility of separation of the top sheet 14 from the absorbent component 13, and a clearly defined embossed pattern cannot to be educated.

[0045] Meanwhile, in the recessed portions 21 of the embodiment, as the distance between the right inclined, recessed part 21a and the left inclined, recessed part 21b adjacent to each other decreases, the embossing roller enters the intersection zone 25 in which surface density is low. Accordingly, the recessed portions 21 are formed without tightly pulling the top sheet 14. Thus, the amount of material of the absorbent element 13 to be pressed down is small, and thereby the probability of tearing of the top sheet is reduced. In addition, the corner portions formed in the intersection zones 25 are not hard and create an improved touch feel, and the surface of the top sheet 14 has a smooth finish. In addition, it is possible to prevent the separation of the top sheet 14 from the absorbent component 13 while maintaining the softness of the top sheet 14 and the absorbent component 13.

[0046] In addition, in the recessed parts 21 of the embodiment, low intersection zones 25 are formed with gaps in the directions in which the pressed rows 22 pass. In the diaper 10 of the embodiment, the formation of intersection zones 25 can provide increased bendability and flexibility. areas 25 of the intersection of the pressed rows 22 and to create for the wearer of the diaper 10 a feeling of greater softness to the touch than in the case when only the recessed parts 21 are formed.

[0047] FIG. 7 is a schematic view illustrating a cross-sectional shape taken along line VII-VII of FIG. 6, in an enlarged view, FIG. 8 is a schematic illustration illustrating a cross-sectional shape made along line VIII-VIII in FIG. .6, enlarged view, FIG. 9 is a schematic diagram illustrating a sectional view taken along line IX-IX of FIG. 6, an enlarged view, and FIG. 10 is a schematic view illustrating a sectional view taken along line XX in FIG. 6, enlarged ohm form. In addition, in the sections of Figs. 7-10, the density of the absorbent component 13 is expressed by the density of dots.

[0048] As illustrated in FIG. 7, in the sectional shape around each recessed portion 21, the inlet end portion is wider than the lower portion. The part indicated by 13D is a high surface density, pressed part of the absorbent component 13, which has a high surface density and which is compressed. The parts indicated by 13E are high-density, non-pressed parts of the absorbent component 13, which have a high surface density and which are not compressed. In particular, the high surface density pressed parts 13D correspond to the buried parts 21 except for the intersection zones 25, and the high surface density pressed parts 13E correspond to the absorbent component 13 in the main absorbent zones 26. As described above, the absorbent component 13 is formed mainly from SAP and cellulose, and its density depends mainly on the density of cellulose fibers. Accordingly, in the high surface density pressed parts 13D, the cellulose is compressed and there are few gaps between the cellulose fibers. Meanwhile, in the extruded parts 13E with high surface density there are more gaps between the cellulose fibers than in the pressed parts 13D with high surface density.

[0049] Furthermore, the recessed portions 21 are formed with a film shape by squeezing / compressing and joining together the top sheet 14 formed from synthetic fibers and the absorbent component 13, consisting mainly of cellulose. Accordingly, the lower surfaces of the recessed portions 21 facilitate diffusion of the fluid secreted by the body in the directions in which the pressed rows 22 pass, until the fluid secreted by the body is absorbed.

[0050] As shown in FIG. 8, in an embodiment, the absorbent component 13 is attached to the top sheet 14 and the core wrapper 15 in the low surface density portions 23. 9 illustrates a sectional shape of each intersection zone 25. The part indicated by 13F is a low surface density, non-pressed part of the absorbent component 13, which has a low surface density and which is not pressed. The part indicated by 13G is a low surface density, pressed part of the absorbent component 13, which has a low surface density and which is pressed. In particular, the non-pressed parts 13F with low surface density correspond to the low-density areas 23 that are not pressed, and the low-density pressed parts 13G correspond to low-density parts 23 that are pressed. As illustrated in FIG. 9, in an embodiment, the low surface density portions 23 in the intersection zones 25 (pressed low surface density parts 13G) are pressed to the same thickness as the recessed portions 21. However, the low surface density portions 23 are in the zones 25 intersections have a low surface density, and thus sections 23 with a low surface density in the intersection zones 25 can maintain a lower density than the buried portions 21 except for the intersection zones 25 (pressed e parts with high surface density 13D). In particular, as illustrated in FIG. 9, despite the fact that the absorbent component 13 in the intersection zones 25 (in the pressed parts of low surface density 13G) is pressed to a higher density than the unpressed parts of the low surface density 13F illustrated in FIG. 8, the absorbent component 13 in the intersection zones 25 has a lower density than the recessed portions 21 except for the intersection zones 25 (extruded portions 13D with high surface density). Since it is possible to maintain low density as well as reduce thickness in the intersection zones 25 in the absorbent component 13, as described above, softness may be maintained in the intersection zones 25. In an embodiment, the density of the absorbent component 13 in the intersection zones 25 (low-density pressed parts 13G) is lower than the density of the absorbent component 13 in the zones in which the pressed rows 22 are formed, except for the intersection zones 25 (in high-density pressed parts 13D) . In addition, in the present invention, a variant is permissible in which the density of the absorbent component 13 in the low surface density portions 23 is equal to or greater than the density of the absorbent component 13 in the intersection zones 25, provided that in this embodiment, the effect can be ensured that that the intersection zones 25 and / or the parts around the intersection zones 25 are soft. As illustrated in FIG. 10, although the thickness of the absorbent component 13 in the lower parts in which the pressed rows 22 are formed including intersection zones 25 is substantially constant in the embodiment, the present invention is not limited to this configuration. For example, squeezing can be performed so that only the zone 25 of the intersection will have a small thickness. In particular, recessed parts with a greater depth than the recessed parts 21 of the pressed rows 22 can be provided in the intersection zones 25 provided with the areas 23 with low surface density. In this configuration, the intersection zones 25 are not only made softer due to the presence of sections 23 with a low surface density, but the intersection zones 25 are also made more flexible due to the small thickness of the intersection zones 25. In this case, the density of the absorbent component 13 in the areas 23 with low surface density in the zones 25 of the intersection may be equal to or greater than the density of the absorbent component 13 in the pressed rows 22 with the exception of areas 23 with low surface density.

[0051] As illustrated in FIG. 10, the density of the low surface density pressed parts 13G of the absorbent component 13 in the areas of the pressed rows 22, which are areas including the intersection areas 25 below the density of the high surface density of the pressed parts 13D the absorbent component in the zones of the pressed rows 22, in which the recessed parts are formed and which are zones that do not include the intersection zone 25.

[0052] An embodiment of an embossed pattern formed by embossing will now be described.

[0053] As illustrated in FIG. 5, the embossed pattern of the embodiment is a lattice pattern in which a plurality of recessed portions 21 are formed, with the plurality of recessed portions 21 extending continuously. As illustrated in FIG. 5, the recessed portions 21 are arranged so that the length of the diagonal L1 in each square of the lattice is 42 mm (4.2 cm). In addition, as illustrated in FIGS. 5 and 6, the width Q1 of each extruded row 22 is 3 mm and preferably 2 mm to 5 mm. In addition, as illustrated in FIGS. 5 and 6, in the embossed illustration of the embodiment, the first extruded rows 22a extend parallel to each other at intervals S1, and the second extruded rows 22b extend parallel to each other at intervals S2. The first extruded rows 22a and the second extruded rows 22b form an embossed pattern, which is an oblique lattice pattern. In an embodiment, the length S1 of one side of the grating is equal to the length S2 of the other side of the grating, and the lengths S1, S2 are 29.7 mm. The grating intervals are preferably 13.0 mm or more and 54.0 mm or less.

[0054] Assume that the depth of each recessed portion 21 in the absorbent component 13 is D1, the thickness of the kit of the absorbent component 13 and the top sheet 14 before embossing, that is, the maximum thickness of the set of the absorbent component 13 and the top sheet 14 in each main absorbent zone 25 is D2, the thickness of the diaper 10 in each recessed portion 21 is D3, and the thickness of the absorbent component 13 in each recessed portion 21 is D4. In an embodiment, the depth D1 of each recessed portion 21 is 7.8 mm. In an embodiment, the thickness D2 is 8.0 mm, preferably 5.0 mm - 20.0 mm. The thickness D3 is 1.0 mm, and the thickness D4 is preferably 0.2 mm to 0.6 mm. In addition, in the embodiment illustrated in FIG. 7, the thickness D3 is 1.0 mm. It should be noted that the thickness D4 (see FIG. 7) of the absorbent component 13 in the recessed portions 21 is preferably 0.2 mm - 0.6 mm.

[0055] In this case, the depth D1 of each recessed portion 21 is approximately 42.5% to 97.5% of the thickness D2. As described above, the recessed portions 21 in the embodiment are formed by pressing the absorbent component 13 toward the bottom sheet 12 by compression by means of an embossing roller.

[0056] The density of the absorbent component 13 in the intersection zones 25 (in the pressed parts 13G with a low surface density) in the embossed pattern of the embodiment is 0.8 g / cm ³ and preferably 0.5 g / cm ³ -1.2 g / cm ³ . In addition, the density of the absorbent component 13 in the recessed portions 21 with the exception of the intersection zones 25 (in the pressed portions 13D with high surface density) in the embodiment is 1.38 g / cm ³ and preferably 0.8 g / cm 3-1.9 g / cm ³ . In addition, the density of the absorbent component 13, with the exception of the recessed parts 21 (in the non-pressed parts 13E with high surface density) in the embodiment is 0.05 g / cm ³ and preferably 0.03 g / cm 3-0.07 g / cm ³ .

[0057] The formation of an absorbent component 13 with such a density distribution can provide a reduction in stiffness in the intersection zones 25. Accordingly, when the embossed lattice pattern is formed on the absorbent component 13, the situation is avoided when the intersection zones 25 become hard and they are bent to provide the wearer with a better feel when used (soft feeling).

[0058] The formation of the recessed portions 21 with such depth and intervals makes it possible to maintain the grooves even when exposed to body weight, and also makes it possible for the surface in contact with the skin in the inguinal part of the diaper to retain the ability to create a soft feeling to the touch. Accordingly, an embossed oblique lattice pattern can suppress deformation, such as twisting the diaper in response to various movements of the legs, and provide softness to the touch of the diaper.

[0059] Assume that, as illustrated in FIG. 6, the intersection zone 25, which is thin and has an intermediate density, is zone Q1, the zone crossing the pressed row 22 in the width direction, which is thin and has a high density, represents zone Q2, the main absorbent zone 26, which is thick and has a low density, represents zone Q3, and the zone extending in the direction of the length of the pressed row 22, which is thin and has a high density, represents zones Q4. The procedure for changing stiffness (bending difficulties, bending resistance) in a diaper 10 with such a density distribution can be such that the stiffness of the zone Q1 <the stiffness of the zone Q2 <the stiffness of the zone Q3 <the stiffness of the zone Q4 is in order from the soft (and bendable) part to the hard (and less bendable) parts.

[0060] Making the diaper 13 soft in the direction crossing the intersection zone 25, in a configuration in which the stiffness of the absorbent component 13 is greatest in the zone Q4 extending in the length direction of the pressed row 22, which is thin and has a high density, as described above, makes it possible to deform the diaper 10 in such a way that the diaper 10 will expand in the direction away from the body of the wearer and will preserve the space between the body and the wearer and the diaper 10 when the wearer when wearing the diaper 10. This can prevent the situation in which the intersection zones 25 become hard, and provide the bendability of the intersection zones 25 to give the wearer a better feel when using (soft feeling) when the embossed lattice pattern is formed on the absorbent component 13. In addition, the implementation of the soft crossing zones 25 can prevent a situation in which the absorbent component 13 can be more likely to rupture in the crossing zones 25 due to the movements of the carrier.

[Modified example]

[0061] The present invention is not limited to the above embodiment, and corresponding changes and modifications can be made within the scope without departing from the technical ideas of the present invention.

[0062] For example, although embossing using the embossing roller in the above embodiment is described, embossing is not limited to this method. For example, embossing can be accomplished by using an embossing plate plate corresponding to the size of the diaper and creating an embossed pattern by indentation on an element having the dimensions of the diaper.

[0063] Furthermore, although the diaper is formed so that the absorbent component 13 is wrapped in a hydrophilic sheet and then the top sheet 14 is placed on the absorbent component 13, the diaper can also be formed so that the top sheet 14 will be placed directly on the absorbent component 13. In addition, a liquid diffusion sheet intended to improve liquid diffusion ability may be provided between the top sheet 14 and the hydrophilic sheet. This leaf promotes diffusion of the fluid secreted by the body. In addition, the hydrophilic sheet can be attached so that it wraps the absorbent component 13, or can be positioned so that it is simply superimposed on the upper and rear sides of the absorbent component 13 without covering the end parts of the absorbent component 13.

[0064] Although the recessed portions 21, which are continuous grooves, form extruded rows 22 in the above embodiment, discontinuous (eg, spaced apart) grooves may form extruded rows 22 (see modified example described below) . It should be noted that the shape of the recessed portions 21 is not limited to the shape illustrated in the embodiment, and may be any of various shapes, such as a quadrangle, circle, ellipse, and triangle.

[0065] The disposable diaper 10 according to the above embodiment can be used as an adult diaper and a baby diaper. In addition, although the description has been made using the expandable diaper 10 (the so-called diaper fastened with ribbons) as an example in the above embodiment, it goes without saying that the present invention can also be applied to a pull-on type diaper. In addition, the absorbent article of the present invention is not limited only to diapers, and the present invention can be applied to various other conventional absorbent articles, such as an absorbent pad and a urological pad. For example, due to the structure of the part including the absorbent component 13 and the topsheet 14, as illustrated in FIG. 5, the present invention can also be applied to absorbent pads and the like, and has effects and effects similar to those in the diaper.

[0066] Although only one surface of the absorbent component 13 is embossed in the above embodiment, the configuration of the absorbent component 13 is not limited to this, and a configuration in which both surfaces are embossed can be used. In particular, the recessed portions 21 are formed both on the upper surface and on the rear surface of the absorbent component 13 by embossing the absorbent component 13 from both the top sheet 14 and the back sheet 12. This can prevent pressure concentration on only one of the top and the back surfaces of the absorbent component 13. Accordingly, it can clearly form the pressed rows 22 without deep squeezing the absorbent component 13 during embossing and maintain the flexibility of the diaper 10.

[0067] Furthermore, although the recessed portions 21 are formed continuous in the above embodiment, the recessed portions 21 may be intermittent in the present invention. In this case, the shape of the sections 23 with a low surface density in the zones 25 of the intersection (in the pressed parts 13G with a low surface density) also changes. 11 is a sectional view of a modified example of the present invention taken along line X-X in FIG. 6. The elements forming the diaper in the modified example, with the same functions as the elements in the above embodiment, are denoted by the same reference position as the reference position in the embodiment, and their description is omitted.

[0068] In the modified example, no recessed portions 21 are formed in portions corresponding to the intersection zones 25 in which the pressed rows 22 intersect with each other. In this case, as illustrated in FIG. 11, the low surface density portions 23 in the intersection zones 25 (in the low surface density pressed parts 13G) are not pressed and instead are slightly compressed when pressing the buried portions 21 around the intersection zones 25, which should be formed slightly protruding towards the skin contact side in a sectional view (when comparing this with FIG. 6 in the above embodiment). Since in this configuration, the density of the absorbent component 13 in the intersection zones 25 is lower than the density in the recessed portions 21, effects similar to those in the above embodiment can be obtained.

[0069] Furthermore, although the low surface density portions 23 and the core wrapper 15 are connected to each other in the above embodiment, as illustrated in FIGS. 3 and 8, the low surface density portions 23 and the wrapper 15 for the cores may not be connected to each other in the present invention. This configuration can be used to prevent the parts from being squeezed (or to make the parts less likely to be squeezed) in which areas of low surface density 23 are formed when buried parts 21 are formed in the intersection zones 25 when the absorbent component 13 is squeezed.

List of Reference Items

[0070]

10 Disposable diaper 10A Fastening tape 10V Front sheet 10F Front main zone 10R Back main zone 10C Inguinal zone 10W Waist hole 10L Foot hole 10D Elastic sheet eleven Covering sheet 11A, 13A Cutaway 12 Bottom sheet (lower surface sheet) thirteen Absorbent component 14 Top sheet (top surface sheet) fifteen Core wrapper 16, 19 Rubber thread 18 Side sheet 21 Buried part 21a Recessed portion having a slope to the right (recessed portion having a slope in the first direction) 21b Recessed part having a slope to the left (recessed part having a slope in the second direction) 22 Extruded row 22a First pressed row 22b Second pressed row 23 Low surface area 24 Low Density Range 25 Intersection Zone 26 Primary Absorption Area S1 Interval during the formation of many first pressed rows S2 The interval in the formation of many second pressed rows Q1 Pressed row width D1 Depth of Depth D2 The thickness of the main absorbent zone D3 The thickness of the diaper in the recessed part D4 The thickness of the absorbent component in the recessed part L1 Diagonal of one square L2 The interval between adjacent rows with low surface density.

Claims (12)

1. Absorbent product containing: liquid permeable, top surface sheet; impervious to liquids, lower surface sheet; and an absorbent component located between the upper surface sheet and the lower surface sheet, wherein a plurality of pressed rows consisting of a plurality of recessed parts are disposed on the absorbent component, a plurality of recessed parts are formed by compressing the upper surface sheet and the absorbent component together, wherein the plurality of pressed rows intersect each other, and wherein all the intersection zones of the pressed rows and / or the parts around all the intersection zones are made with sections with low surface density, and wherein the absorbent component is located between the lower part of the recessed part and the lower surface sheet. 2. The absorbent product according to claim 1, in which the density of the absorbent component in areas of low surface density in the zones of intersection is lower than the density of the absorbent component in areas in which the pressed rows are formed, except for areas with low surface density. 3. The absorbent article according to claim 1, wherein the density of the absorbent component in areas of low surface density in the intersection zones is equal to or higher than the density of the absorbent component in areas in which the pressed rows are formed, except for areas with low surface density. 4. An absorbent article according to any one of claims 1 to 3, wherein a plurality of recessed portions are formed on the side of the upper surface sheet by pressing the upper surface sheet and the absorbent component. 5. Absorbent product according to any one of claims 1 to 3, in which many of the recessed parts are continuous grooves. 6. The absorbent article of claim 4, wherein the plurality of recessed portions are continuous grooves.

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