KR100235695B1 - Disposable diapers - Google Patents

Abstract

The invention relates to an absorbent portion 3, a pair of ear portions 6 each projecting in opposite directions from opposite side edges of one longitudinal distal end of the absorbent portion 3, and the four side edges of the ear portion 6, respectively. A disposable diaper 1 comprising one fastening means 7 attached thereto. The oblique edge of the ear 6 is inclined at a predetermined angle with respect to the longitudinal central axis of the absorbent portion, and each of the fastening means 7 is at the oblique edge having a first oblique edge and a second oblique edge, respectively. Attached, each ear 6 has a stress relaxation structure having a tensile stress at a portion other than the periphery that is less than the tensile stress induced at the periphery of the ear 6 and each fastening means is adapted to distribute the tension. It is attached to the ear piece 6 at the tow of the dead edge.

Description

Disposable diapers

Known disposable diapers are generally formed by sandwiching an absorbent core between the topsheet and the backsheet to cover the wearer's crotch, and the sides of the absorbent portion at one longitudinal distal end to wrap around the wearer's waist. A pair of ear portions projecting in the opposite direction from the edges, and two fastening means provided on the side edges of the ear portions, respectively. In the case of using such a disposable diaper, the disposable diaper is worn in a general manner to the wearer, and then the fastening means is wrapped around the waist and attached to the absorbent portion on the opposite side of the fastening means to secure the disposable diaper to the wearer. . In this way, when worn on the wearer, by fixing the disposable diaper to the waist and legs of the wearer, it is possible to prevent the formation of a gap between the disposable diaper and the wearer's waist and legs by leaking liquid waste. When the wearer is wearing a disposable diaper with fastening means provided on the side edges of each ear piece, the tension applied to the absorbing portion by the fastening means effectively concentrates the portion of the absorbent portion wrapped around the waist and legs of the wearer. This makes it difficult to do so, i.e. a gap is formed around the wearer's leg when the disposable diaper is fastened to the wearer's waist, or a gap is formed around the wearer's waist when the disposable diaper is fixed to the wearer's leg so that the disposable diaper You cannot wrap it around.

Various improvements have been proposed to solve the above problems and to improve the fixability of the disposable diaper to the wearer's waist and legs. US Pat. No. 4,680,030 to Aled et al., US Pat. No. 4,826,499 to Schhrner and Schreiner, a technique for improving the fixation of disposable diapers to both waist and legs. US Pat. No. 4,937,887 to U.S. Patent No. 4,937,887, which uses two pairs of fastening means each attached to a pair of ear portions projecting in opposite directions from a disposable diaper portion wrapped around the waist. However, such prior art disposable diapers are difficult to handle with two pairs of fastening means, and there is room for improvement in these prior art disposable diapers.

Techniques for eliminating this drawback are disclosed in US Pat. No. 4,911,702 to O'Leary and US Pat. No. 4,857,067 to Wood, each of which is attached to two ear parts. Two fastening means, and the tension applied to the fastening means can be effectively focused on the portion of the absorbent portion wrapped around the waist and legs. However, this technique does not mention the location of the two fastening means that can effectively distribute the tension applied to the two fastening means around the waist and around the leg, and also determines the desired distribution of the tension applied to the two fastening means. It does not mention the location of two fastening means that can be distributed around the waist and legs.

For example, the disposable diapers described in Japanese Utility Model Publication No. 59-73305 have a main portion, each of the ear portions protruding in opposite directions from the side edges of the main portion, and from the rear side to the transverse edge of the longitudinal end of the main portion. It has two fastening means attached to the side edges of the ear, parallel to the longitudinal axis of the main part, so as to extend at an angle to effectively distribute the tension applied to the main part by the two fastening means around the waist and the leg. The two fastening means are attached to each of the ear parts so as to extend at an angle to the transverse edge of the longitudinal end of the main part portion on the rear side, so that the fastening means have side edges parallel to the longitudinal axis of the main part. Fastening means are pulled reflexively in the direction perpendicular to the side edges of the ear, as a result of which the tension applied to the main part by the two fastening means cannot be properly distributed around the waist and legs at the desired distribution ratio. .

Summary of the Invention

Accordingly, a first object of the present invention is to have an absorbent portion provided with fastening means arranged to be pulled at an angle to the axis of the disposable diaper, and to effectively apply the tension applied to the fastening means to the portion of the absorbent portion wrapped around the waist and legs, respectively. It is to provide a disposable diaper that can be directly focused.

It is a second object of the present invention to provide a disposable diaper having an absorbent portion provided with fastening means arranged so as to distribute the tension applied to the fastening means around each waist and leg at a desired distribution ratio.

A third object of the present invention is an absorbent portion wrapped around a leg and provided with an elastic fixing member, respectively, so that the tension applied to the fastening means is effectively concentrated directly on the absorbent portion and the elastic fixing member wrapped around the waist. It is to provide a disposable diaper having fastening means arranged.

A fourth object of the present invention is a fastening arranged around the waist and legs and provided with an elastic fixing member, respectively, and a fastening arranged such that the tension applied to the fastening means is effectively concentrated directly on the elastic fixing member. It is to provide a disposable diaper having a means.

In the first object of the present invention, a disposable diaper includes: an absorbent portion formed by sandwiching the absorbent core between the top sheet and the back sheet so that the absorbent core may correspond to the wearer's crotch when worn by the wearer; A pair of ear portions projecting in opposite directions from each of the opposite side edges of one longitudinal distal end of the absorbent portion; And one fastening means attached to each side edge of the ear canal. In such disposable diapers, each of the four edges of the ear of which the fastening means is attached is inclined so as to extend at a predetermined angle with respect to the longitudinal central axis of the disposable diaper, and each of the fastening means is perpendicular to the corresponding four edges of the diaper. Attached to the ear portion such that each ear portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, and each fastening means has at least a first side edge portion. A first boundary line extending from one longitudinal distal edge to abut the stress relief structure, the first side edge being attached to the ear at the tow of the four-side edge of the ear overlapping the portion of the second and second side edges; On the side of one longitudinal distal edge of the absorbent portion corresponding to the ear canal from And an absorbent portion perpendicular to the longitudinal central axis of the absorbent portion from a second boundary line extending from a point on the absorber side edge where the lower end of the ear portion connects with the absorbent portion so as to contact the stress relaxation structure. Extends on the side of the lateral central axis.

In a second object of the invention, a disposable diaper is formed by sandwiching the absorbent core between the topsheet and the backsheet so that when worn on the wearer, the absorbent core may correspond to the wearer's crotch, An absorbent portion having a first waist wrap portion and a second waist wrap portion connected to each of the second longitudinal end edges, and a crotch wrap portion extending between the first waist wrap portion and the second waist wrap portion; A pair of ear portions protruding from opposite side edges of the first waist wrapping portion of the absorbent portion; And a fastening means attached to each of the four side edges of the ear portion. In such disposable diapers, each of the four edges of the ear of which the fastening means is attached is inclined at a predetermined angle with respect to the longitudinal central axis of the disposable diaper, and each of the fastening means extends perpendicularly to the corresponding four edges of the diaper. A point on the first longitudinal distal edge that is attached to the mold and each ear has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear is induced at a portion other than the periphery and abuts the stress relaxation structure The portion of the first waist wrap portion extending on the side of the first longitudinal distal edge from the first boundary line extending from the waist wrap component distribution region to which the tensile component applied to the fastening means directly acts and corresponds to the waist wrap component distribution region. The bevel portion of the ear canal is the first bevel edge and the stress is The first waist portion extending on the side of the crotch from the second boundary line extending from the point on the absorber side edge where the lower end of the ear piece is connected to the absorbent portion to contact the structure is directly affected by the tensile force applied to the fastening means. A leg wrap component distribution region, and the quadrilateral edge portion of the ear portion corresponding to the leg wrap component distribution region is a second quadrilateral edge portion, and each fastening means includes at least a portion of the first side edge portion and a portion of the second side edge portion; It is attached to the ear at the tow of the four edges of the overlapping ear.

In a third object of the invention, a disposable diaper is formed by sandwiching the absorbent core between the topsheet and the backsheet so that, when worn on the wearer, the absorbent core may correspond to the wearer's crotch, An absorbent portion having a first waist wrap portion and a second waist wrap portion connected to each of the second longitudinal end edges, and a crotch wrap portion extending between the first waist wrap portion and the second waist wrap portion; Elastic leg fastening means extending along the opposite longitudinal side edge of the crotch wrapping; A pair of ear portions protruding from opposite side edges of the first waist wrapping portion of the absorbent portion; And a fastening means attached to each of the four side edges of the ear portion. In such disposable diapers, each of the four edges of the ear of which the fastening means is attached is inclined at a predetermined angle with respect to the longitudinal central axis of the disposable diaper, and each of the fastening means extends perpendicularly to the corresponding four edges of the diaper. A point on the first longitudinal distal edge that is attached to the mold and each ear has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear is induced at a portion other than the periphery and abuts the stress relaxation structure The portion of the first waist wrap portion extending on the side of the first longitudinal distal edge from the first boundary line extending from the waist wrap component distribution region to which the tensile component applied to the fastening means directly acts and corresponds to the waist wrap component distribution region. The bevel portion of the ear canal is the first bevel edge and the stress is The first waist wrap portion extending on the side of the crotch wrap from the second boundary extending from one distal point of the resilient leg fastening means on the side of the first waist wrap to contact the structure results in a tension component applied to the fastening means. A leg wrapping component distribution area that acts directly, the quadratic edge of the ear portion corresponding to the leg wrapping component distribution region is a second quadrilateral edge, and the fastening means is at least a portion of the first quadrilateral edge and the second quadrilateral; It is attached to the ear at the tow of the quadrilateral edge that overlaps a portion of the edge.

In a fourth object of the invention, a disposable diaper is formed by sandwiching the absorbent core between the topsheet and the backsheet so that the absorbent core may correspond to the wearer's crotch when worn on the wearer, An absorbent portion having a first waist wrap portion and a second waist wrap portion connected to each of the second longitudinal end edges, and a crotch wrap portion extending between the first waist wrap portion and the second waist wrap portion; Elastic waist fastening means extending from the first waist wrap portion along the transverse edge of the absorbent portion; A pair of ear portions attached to the first waist wrapping portion of the absorbent portion; And a fastening means attached to each of the four side edges of the ear portion. In such a disposable diaper, the quadrilateral edge of the ear canal extends at a predetermined angle with respect to the longitudinal central axis of the disposable diaper, and each of the fastening means is attached to the ear canal so as to extend perpendicular to the corresponding quadrilateral edge and each ear canal. The portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, and contacts the stress relaxation structure portion on the side of one end of the elastic waist fastening means. The portion of the first waist wrap portion extending on the side of the first longitudinal distal edge from the first boundary line extending from the same end of the elastic waist fastening means on the side is such that the tension component applied to the fastening means is the end of the elastic waist fastening means. The waist wrapping component distribution area that acts directly on The crotch edge of the corresponding ear portion is the first tetragonal edge and the crotch from a second boundary line extending from the point on the distal edge of the ear on the crotch wrapping side to contact the stress relaxation structure from the second edge The first waist wrapper portion extending on the side of the lapping portion is a leg wrapping component distribution area in which the tensile component applied to the fastening means acts directly on the distal edge of the ear portion, and the quadrilateral edge portion corresponding to the leg wrapping component distribution region is provided. A second quadrangle edge, and the fastening means is attached to the ear at the tow of the quadrangle edge that overlaps at least a portion of the first quadrangle edge and a portion of the second quadrangle edge.

In a fifth object of the invention, a disposable diaper is formed by sandwiching the absorbent core between the topsheet and the backsheet so that, when worn on the wearer, the absorbent core may correspond to the wearer's crotch, An absorbent portion having a first waist wrap portion and a second waist wrap portion connected to each of the second longitudinal end edges, and a crotch wrap portion extending between the first waist wrap portion and the second waist wrap portion; Elastic leg fastening means extending along the opposite longitudinal side edge of the crotch wrapping; Elastic waist fastening means extending from the first waist wrap portion along the transverse edge of the absorbent portion; A pair of ear portions attached to the first waist wrapping portion of the absorbent portion; And a fastening means attached to each of the four side edges of the ear portion. In such disposable diapers, each of the four edges of the ear portion attached to the fastening means are inclined at a predetermined angle with respect to the longitudinal central axis of the disposable diaper, and each of the fastening means extends perpendicularly to the corresponding four edges of the diaper. A point on the first longitudinal distal edge that is attached to the mold and each ear has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear is induced at a portion other than the periphery and abuts the stress relaxation structure The portion of the first waist wrap portion extending on the side of the first longitudinal distal edge from the first boundary line extending from the waist wrap component distribution region to which the tensile component applied to the fastening means directly acts and corresponds to the waist wrap component distribution region. The four corners of the ear canal are the first four corners of the ear, and the stress The first waist wrap portion extending on the side of the crotch wrapper from the second boundary extending from one end point of the resilient leg fastening means on the side of the first waist wrap portion to abut the arm structure results in a tension component applied to the fastening means. A leg wrapping component distribution area that directly acts on one end of the elastic leg fastening means, and the quadrilateral edge portion of the ear portion corresponding to the leg wrapping component distribution region is a second quadrant edge portion, and the fastening means is a first quadrant portion. It is attached to the ear at the tow of the quadrilateral edge that overlaps at least a portion of the edge and a portion of the second quadrangle edge.

The oblique edge of the ear of the disposable diaper according to the invention is inclined at a predetermined angle with respect to the longitudinal central axis of the disposable diaper, and the fastening means are respectively disposed on the oblique edge so as to extend substantially perpendicular to the oblique edge As a result, each fastening means is constantly drawn in a fixed direction with respect to the corresponding quadrilateral edge of the ear, and an appropriate tension is distributed over the absorbent portion wrapped around the leg.

Fastening means when the inclination of the lateral edge of the ear portion, i.e. the angle measured counterclockwise from the line parallel to the longitudinal central axis of the disposable diaper in the counterclockwise direction is in the range of greater than zero and less than 45 Most of the tension applied to the leg wrap may be distributed to the leg wrap, and some tension may be distributed to the waist wrap. If the angle is 45, most of the tension applied to the fastening means may be distributed to the waist wrap. And some tension may be distributed in the leg wrap.

The stress relief structure of the ear portion absorbs the tension applied thereto, and the periphery of the ear portion transfers the tension directly to the absorber so that the tension applied to the fastening means can be effectively applied directly to the waist wrap and leg wrap of the absorber. .

Fastening means are applied to the oblique side edges of the ear canal in the retractable portion overlapping at least a portion of the first tetragonal edge and a portion of the second quadratic edge defined in position and connected to the stress relief structure of the ear canal. By applying the tension, the tension applied to the fastening means is reliably applied to the longitudinal end edge portion of the absorbent portion on the side of the first waist wrapping portion or to the edge portion of the ear portion on the side of the transverse central axis of the disposable diaper.

The tension acting on the longitudinal distal edge portion of the absorbent portion on the side of the first waist lapping portion or the edge portion of the ear portion on the side of the transverse central axis of the disposable diaper is either the first tetragonal edge or the second tetragonal edge It can be adjusted by adjusting the degree of overlap of the tow portion, which is the place where the fastening means is attached to the ear portion with the portion. Most of the tension applied to the fastening means is applied to the first waist lapping portion when the degree of overlap between the tow portion and the first quadrangle edge portion is greater than the degree of overlap between the tow portion and the second quadrangle edge portion, Applied to the distal edge of the ear portion on the side of the transverse central axis of the disposable diaper when the degree of overlap between the tow and the first side edge is less than the degree of overlap between the tow and the second side edge. All.

When the line extending from the distal end of the elastic waist fastening means or the distal end of the elastic leg fastening means intersects the tetrahedral edge of the ear, so that the first tetragonal edge or the second tetragonal edge contacts the stress relaxation structure, The tension applied to the fastening means is reliably applied to the elastic waist fastening means and the elastic leg fastening means.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

The present invention each has an absorbent portion, a pair of ear-shaped portions projecting in opposite directions from the side edges of one longitudinal distal end of the absorbent portion, and fastening means provided on the oblique side edge of the ear-shaped portion, The tension applied to the absorbing portion by the fastening means can be effectively distributed around the waist and around the leg to prevent leakage of liquid waste through the gap between the edge of the disposable diaper and the wearer's waist and leg, providing comfort to the wearer. It relates to a disposable diaper that can be.

1 is an exploded view of a disposable diaper according to the present invention.

2 is a partial cross-sectional view of an absorbent portion of a disposable diaper according to the present invention.

3 is a cross-sectional view of the ear portion.

Figure 4 is a plan view of the stress relaxation structure of Example 1 included in a disposable diaper according to the present invention.

5 is a stress relaxation structure of Example 2 included in a disposable diaper according to the present invention.

6 is a stress relaxation structure of Example 3 included in a disposable diaper according to the present invention.

7 is a stress relaxation structure of Example 4 included in a disposable diaper according to the present invention.

8 is a side view illustrating an apparatus for forming a stress relaxation structure.

9 is a plan view of a forming plate of an apparatus for forming a stress relaxation structure.

10 is a partial perspective view of the stress relaxation structure formed by the stress relaxation structure of FIG. 8.

FIG. 11 is a partial perspective view of the half-stretched state of the formed intermediate film shown in FIG. 10.

FIG. 12 is a partial perspective view of a fully formed state of the formed intermediate film shown in FIG. 10.

13 is a partially exploded view of a disposable diaper according to the present invention for explaining the tension distribution applied to the fastener at a predetermined distribution ratio.

FIG. 14 is a partial exploded view of a disposable diaper according to the present invention for explaining the distribution of each of the waist wrapping and leg wrapping portions of a disposable diaper with most and slight tension applied to the fastener.

FIG. 15 is a partial exploded view of a disposable diaper according to the present invention for explaining the distribution of each of the waist wrapping and leg wrapping portions of a disposable diaper of most and slight tension applied to the fastener.

FIG. 16 is a partially developed view for explaining the first side edge portion a and the second side edge portion b. FIG.

17 is a partially developed view for explaining the dependence of the tension distribution on the fastener position on the ear portion.

18 is a partially developed view for explaining the distribution of tension applied to the fastener.

It is a partial development figure for demonstrating the determination method of the 1st side part edge part.

20 is a partially developed view for explaining another determination method of the first side edge portion.

Fig. 21 is a partially developed view for explaining the positional relationship between the first side edge portion a and the second side edge portion b in which the stress relaxation structure is formed in the disposable diaper according to the present invention.

Fig. 22 is a partially developed view for explaining the positional relationship between the first side edge portion a and the second side edge portion b in which the stress relaxation structure is formed in the disposable diaper according to the present invention.

Fig. 23 is a partially developed view for explaining the first side edge portion a and the second side edge portion b of the side edge portion of the ear portion of the disposable diaper according to the present invention.

24 is a partial exploded view of the ear of another embodiment.

In the following detailed description, terms indicating a location, a direction, and the like refer to a location and a direction shown in the drawings.

1, the disposable diaper 1 of the first aspect according to the invention has a first waist wrap 2a, a crotch wrap 2b and a second waist wrap 2c, which is substantially rectangular. A longitudinal extension to the flap 4 to provide an absorbent portion formed in a pavilion, T-shaped or asymmetric shape, a side flap 4 formed on each of the opposite sides of the absorbent portion 3, an elastic flap 4; An elastic member 5, a pair of ear parts 6 projecting in opposite directions from opposite side edges of the upper distal end of the first waist wrapping part 2a of the absorbent part 3, and the four sides of the ear part 6. Two fasteners 7 each secured to the edge 6a.

Each ear piece 6 has a slightly meandering upper edge 6b, the outer end of the upper edge 6b, inclined downwardly at a predetermined angle with respect to the upper edge 1a parallel to the transverse central axis of the disposable diaper 1. And a meandering edge 6a extending downward meandering from, and a meandering lower edge 6c extending from the outer end of the meandering edge 6a to the side edge of the absorbent portion 3. A fastener 7 is attached to the ear piece 6 so as to extend substantially perpendicular to the dead edge 6a from the dead edge 6a. The slope between the vertical edge 6a and the vertical line passing through the intersection of the upper edge 6b and the four edges 6a and parallel to the longitudinal central axis L-L 'of the disposable diaper 1, ie The angle when measured counterclockwise is greater than 0 and less than 45. The ratio of the tensile distribution, that is, the ratio of the tensile component applied to the fastener 7 distributed around the absorbent portion 3 wrapped around the waist and the tensile component distributed over the absorbed portion 3 wrapped around the leg, depends on the slope. Depends. For example, by determining the inclination appropriately, most of the tensile component is distributed to the portion of the absorbent portion 3 that is wrapped around the leg, and some tensile component is distributed to the portion of the absorbed portion 3 that is wrapped around the waist. Can be.

With reference to FIG. 2, which shows a cross-sectional view taken along the line AA of FIG. 1, the absorbent portion 3 sandwiches the absorbent core 9 between the liquid permeable top sheet 8 and the liquid impermeable backsheet 10. It is formed by writing. The top sheet 8 and the back sheet 10 have a length and width greater than the length and width of the absorbent core 9. At least a portion of the topsheet 8 and the backsheet 10, which correspond to the crotch wrapping 2b and extend outwardly below each longitudinal side edge of the absorbent core 9, forms a side flap 4 and is elastic The member 5 extends longitudinally in the side flap 4 to provide an elastic side flap. The absorbent core 9 is non-irritating to the skin and can absorb and fix liquid excretion including urine. Generally, the absorbent core 9 is made from pulverized wood pulp (generally, cold cotton pulp). The absorbent core 9 may optionally be formed in any suitable form and structure. The overall absorbency of the absorbent core 9 should correspond to the design dose and the desired use. The size and absorbent power of the absorbent core 9 depends on the age of the wearer.

The backsheet 10 is absorbed by the absorbent core 9 and prevents the wetting of products such as beddings or underwear in contact with the disposable diaper 1 with the fixed feces. The backsheet 10 is a thermoplastic polymer film such as polyethylene film or polypropylene film or the like, or a composite film such as nonwoven coated with a film. Preferably, the backsheet 10 is an embossed thermoplastic film that simulates a fabric. The topsheet 8 may be a porous foam sheet, a reticulated foam sheet, a perforated plastic film, a woven or nonwoven fabric of natural fiber material (for example wood fiber or cotton fiber), a synthetic fiber material (for example polyester fiber or Polypropylene fibers) or blended fiber materials (eg, blends of natural fiber material (s) and synthetic fiber material (s)). Preferably, the topsheet 8 is formed from a hydrophobic material to separate the liquid absorbed by the absorbent core 9 from the wearer's skin.

The ear part 6 having a substantially trapezoidal shape is connected to the opposite side edge of the first waist wrap 2a of the rectangular absorbent part 3 by known methods, for example by heat sealing or adhesive bonding. . By projecting the upper side of each of the top sheet 8 and the back sheet 10 outward in the projection having the shape of the ear section 6, and connecting the projecting projections of the top sheet 8 and the back sheet 10 together. The ear portion 6 may be formed integrally with the absorbent portion 3. The absorbing portion 3 and the ear portion 6 can be formed in the complete structure by cutting the laminated sheet formed by sand-wiching the sheet between the top sheet 8 and the back sheet 10 to a desired dimension. Preferably, the ear portion 6 is known as shown in FIG. 3, a nonwoven fabric 11 of natural fibers, impregnated fibers or a blend of natural fibers and synthetic fibers, a thermoplastic film 13 of polyethylene or polypropylene, and The porous film 12 formed by sandwiching between the nonwoven fabric 11 and the thermoplastic film 13 by the adhesive layers 14 and 15 may be formed by stacking the porous film 12. When each ear portion 6 is formed from an extension of the top sheet 8 and an extension of the back sheet 10, the nonwoven fabric 11 and the thermoplastic film 13 are formed of an extension of the top sheet 8. Corresponding to each of the extensions of the rear sheet 10. The porous film 12 sandwiched between the nonwoven fabric 11 and the thermoplastic film 13 provides a hard eared portion 6, which is thereby used when the disposable diaper 1 is worn by the wearer 6. ) Is easier to handle.

As shown in FIG. 6, the ear portions 6 each have a substantially trapezoidal stress relaxation structure 20 therein except for the periphery. The stress relaxation structure 20 is formed in a substantially trapezoidal shape with a longitudinal gap 20a as shown in FIG. 4 or substantially trapezoidal with a transverse gap 20b as shown in FIG. 5. It can be formed as. If the stress relaxation structure 20 has a function of relaxing stress, the stress relaxation structure 20 may be any suitable shape other than trapezoidal, for example, triangle, rectangle, part of an ellipse, or part of a circle. have. The stress relaxation structure 20 of the ear canal 6 can be a plurality of aggregates of laminated sheet-shaped longitudinal slits 21a forming the ear 6 as shown in FIG. 6. If the single slit 21a can block the tension applied to the ear portion 6 from being transferred to the absorbent portion 3, the stress relaxation structure 20 may be a single slit 21a. As shown in FIG. 7, the ear canal 6 may be formed of an elastic structure, and the periphery (inside) of the elastic structure corresponding to the stress relaxation structure 20 may be applied to a strip of non-stretch film or stretchable strand 30. By attaching the trapezoidal elastic portion) to the internal trapezoidal elastic portion as the stress relaxation structure 20.

When tension is applied to the ears 6, the tension induced in the stress relaxation structure 20 is less than the tensile stress induced at the periphery of the ears 6 surrounding the stress relaxation structure 20. Tensile stress is a resistive force developed by a material that generates a tensile load. Thus, a structure with a small tensile stress is a structure that yields to relatively low tension and can thereby be easily stretched. The structure represented by “stress relaxation structure” includes a gap formed in the ear portion 6 and acting substantially as a stress relaxation structure 20.

Preferably, the stress relaxation structure 20 is formed by the following method. As shown in FIG. 8, the sheet 21 forming the ear canal 6 includes a plate 22 and a stress relaxation structure having a plurality of ridges 22a in the inner surface area corresponding to the stress relaxation structure 20. It is pressed between the plates 23 with a plurality of ridges 23a in the inner surface region corresponding to 20. As shown in FIG. 9, a narrow groove 25a is formed across a plurality of ridges 23a of the plate 23. The plurality of ridges 22a in the plate 22 are connected and not disconnected. As shown in FIG. 10, the stress relaxation structure 20 formed by squeezing the sheet 21 between the plate 22 and the plate 23 has a number of undeformed zones 25, a number of permanently deformed regions. Zone 26 and transition zone 27 between undeformed zone 25 and permanently deformed zone 26. The ridge 28 is formed in the permanently deformed zone 26. The undeformed zone 25 is defined by the narrow groove 25a of the plate 23 and the corresponding portion of the ridge 22a in the plate 22, and the permanently deformed zone 26 is the plate 22. And ridges 22a and 23a in each of the plates 23.

As shown in FIG. 10, when the ear 6 is tensioned with a force acting in the direction of the arrow E, the undeformed zone 25 is plastically stretched to some extent as shown in FIG. 11. In the case where the undeformed zone 25 continues to stretch, the ridges 28 of the permanently deformed zone 26 are flattened as shown in FIG. 12 and the ear canal 6 can no longer extend. When the sheet 21 having the above characteristics is a laminated sheet, it is formed from an extensible film such as a polyolefin film, a low density linear polyethylene film, a low density polyethylene film, a high density polyethylene film or a polypropylene film.

A stress relaxation structure 20 that can be stretched by a small tension is formed as above in the sheet 21 forming the ear portion 6. Since the periphery of the sheet 21 surrounding the stress relaxation structure 20 has not been machined, the sheet 21 may not be stretched or the periphery of the sheet 21 may be more difficult to stretch than the stress relaxation structure 20. The perimeter does not generate tension. When the stress relaxation structure 20 is under tension, the stress relaxation structure 20 yields to a tension absorbing tension and does not shrink the periphery of the ear 6.

The sheet 21 forming the ear 6 may be formed from a somewhat extensible material. When formed from a somewhat extensible material, the stress relaxation structure 20 can be formed in the sheet 21 by the process described above. In all cases, the stress relaxation structure 20 may be stretched by a tension less than the tension required to stretch the periphery of the ear 6.

As shown in FIG. 13, when the tension D is applied to the fastener 7 in a direction perpendicular to the quadrilateral edge 6a of the ear portion 6, the stress relaxation structure 20 of the ear portion 6 is applied. ) Serves to divide the tension D into a tensile component D1 acting on the waist lapping portion and a tensile component D2 acting on the leg lapping portion. That is, in order to stretch the periphery of the ear piece 6, a tension greater than the tension required to stretch the stress tension structure 20 must be applied to the periphery 6, so that most of the tension applied to the fastener 7 It is divided into tensile component D1 and tensile component D2, and the tensile component D1 and D2 acts directly on each of the regions X and Z of the absorber 3. Even when part of the tension D acts on the stress relaxation structure 20, the stress relaxation structure 20 does not extend to an extreme state as shown in FIG. 12, which causes the stress relaxation structure 20 to be relatively This is because it can be stretched by a small tension, and the periphery surrounding the stress relaxation structure 20 cannot be stretched substantially. Thus, the stretchable stress relaxation structure 20 absorbs the tension acting on it, and consequently the tension is not transmitted directly to the region Y of the absorbent part 3. Therefore, the tension D applied to the fastener 7 is the tension component D1 acting on the waist lapping portion of the absorbent portion 3 and the absorbent portion 3 which fixes the absorbent portion 3 around the waist and the leg. Divided by the tensile component D2 acting on the leg wrap.

Fasteners 7 are attached to the lateral edges 6a of the ear piece 6 so as to extend vertically to the lateral edges 6a, and the fasteners 7 are pulled in a direction perpendicular to the lateral edges 6a. Lose. Since the fasteners 7 are always pulled in a direction perpendicular to the side edges 6a of the ear piece 6, the direction in which the fasteners 7 are pulled with respect to the absorbing portion 3 is the direction of the side edges 6a. It depends on the slope, which can vary within a range greater than zero and less than 45. That is, since the fastener 7 is pulled in a fixed direction with respect to the side edge 6a, the difference between the tensile component D1 and the tensile component D2 is not so large when the inclination of the side edge 6a is small. Rather, the ratio of the tensile component D2 to the tensile component D1 increases as the inclination of the quadrilateral edge 6a increases. The tension D applied to the fastener 7 is divided into the tensile component D1 and the tensile component D2 by means of a traction section in which the fastener 7 is attached to the four edges 6a of the ear section 6. It can be adjusted by adjusting the position of R). The tow portion R substantially coincides with the center of the side edge of the stress relaxation structure 20 as shown in FIG. 13, and the tension D applied in the direction of the arrow to the fastener 7 is equal to the tensile component D1. The tensile component D2, divided by the tensile component D2 and acting around the leg, is a predetermined value greater than the tensile component D2 acting around the waist. When the tow portion R is in the position shown in Fig. 14 below the position of the tow portion R shown in Fig. 13, the tension D applied in the direction of the arrow to the fastener 7 is the tensile component D1. And tensile component (D2), the tensile component (D1) acting around the waist is relatively large and the tensile component (D2) acting around the legs is relatively small.

The positional relationship between the traction part and the other part for reliably distributing the position of the traction part R and the tension applied to the fastener 7 to the desired position of the absorbent part 3 is described below. The position of the tow R relative to the fastener 7 on the side edge 6a is determined by the structure shown in FIG. 16. The position of the tow R is important for effectively directing the tension applied to the fastener 7 to the desired waist wrap and the desired leg wrap of the disposable diaper 1 effectively. With reference to FIG. 16, the line L-L 'represents the longitudinal center axis of the disposable diaper 1, and the line H-H' represents the longitudinal diaper of the disposable diaper perpendicular to the longitudinal center axis L-L '. It represents the transverse center axis. P is the intersection of the longitudinal central axis L-L 'and the upper edge 1a of the first waist wrap 2a, and Q is the ear part 6 on the side of the transverse center line H-H'. Is the intersection of the lower side edge 6c and the side flaps 4, L1 is a line extending from the intersection point P to abut the stress relaxation structure 20 point on the side of the upper edge 1a, and L2 is A line extending from the intersection point Q to contact the stress relaxation structure 20 point on the side of the transverse central axis H-H ', A is the intersection of the line L1 and the quadrilateral edge 6a , B is the intersection of the line L2 and the dead edge 6a. The first quadrangle edge a extends from the intersection point A on the top edge 1a and the second quadrangle edge portion b extends from the intersection point B to the transverse central axis H-H '. Extend on the side;

The tension D applied by the fastener 7 to the side edge 6a is distributed in the ear 6 as shown in FIG. 17. In FIG. 17, the working point M of the tension applied to the fastener 7 is at the tow portion R to which the fastener 7 is attached to the four-side edge 6a, in which case the tow portion R is at the intersection point. Is consistent with (A). When a part of the tension applied to the fastener 7 acts on the quadrilateral edge 6a at the working point M, a part of the tension is decomposed into representative components F1, F2, F3 and F4 as shown in FIG. do. The component force F1 is directed to the upper edge 1a and not directly to the intersection point P. Therefore, the component force F1 does not act directly on the intersection point P. The direction of the component force F2 is in line with the line L1, so the component force F2 acts directly on the intersection point P. The component force F3 is directed directly to the stress relaxation structure 20, and is easy to stretch the stress relaxation structure 20. However, since the stress relaxation structure 20 absorbs the force applied thereto, the component force F3 is not transmitted to the region Y of the absorbent portion 3 shown in FIG. The component force F4 is directed to the intersection point Q and acts directly on the absorbing part 3 at the intersection point Q.

In the case where the acting point M of the tow portion R to which the fastener 7 is attached to the dead edge 6a is on the side of the transverse central axis H-H 'with respect to the intersection A, ie , At the point M 'outside of the first quadrangle edge a, FIG. 16, the component force F2 from the point M' towards the intersection point P is the stress relaxation structure 20. Absorbed by and ineffective. Therefore, no component force acts directly on the intersection point P when the acting point M of the tension applied to the fastener 7 on the dead edge 6a is the point M '. When the point M moves to the point M 'on the side of the upper edge 1a with respect to the intersection point A shown in FIG. 17, that is, the operating point M is the first quadrangle edge a If is at, some component acts directly at the intersection point (P).

As can be clearly seen from the foregoing description, the line L1 has a component at the intersection point P and the position of the point of action M, which allows the component of the tension applied to the fastener 7 to act directly on the intersection point P. It is a boundary line between the positions of the working point M which cannot directly act. When the acting point M, which is the tension applied to the fastener 7, acts on the ear 6, at the first quadrant edge a, at least a part of the tension applied to the acting point M is the intersection point P. Can act directly on The line L2 extending in connection with the intersection point Q is a boundary line between the working point M positions at which the component of the tension applied to the fastener 7 can act directly on the intersection point Q. When the acting point M, which is the place where the tension applied to the fastener 7 acts on the ear piece 6, is at the second bevel edge b, at least a part of the tension applied to the acting point M is the intersection point Q. Can act directly on Thus, a portion and a line of the first side edge portion a where the tow portion R, to which the fastener 7 is attached to the side edge portion 6a of the ear portion 6, is defined by the line L1. When a part of the second quadrangle edge portion b defined by L2 overlaps, a part of the tension applied to the fastener 7 may act directly on the desired points P and Q on the absorbent portion 3. Can be. Since the intersection point P is on the longitudinal center line L-L 'of the disposable diaper 1, tension is applied to the two ear parts 6 when a part of each tension can act directly on the intersection point P. FIG. By application, the waist wrapping of the disposable diaper 1 can be firmly fixed around the waist. If a part of the tension applied to each fastener 7 can be applied directly to the intersection point Q, the leg wrapping of the absorbent part 3 can be securely fixed around the leg. The fastener 7 is attached to the lateral edge 6a of the ear portion 6 at the tow R so as to extend perpendicular to the lateral edge 6a, so that the absorbent portion 3 applied to the fastener 7 The direction of tension with respect to the side edges 6a depends on the inclination of the side edges 6a, and the tension applied to each fastener 7 can be distributed in a direction toward the waist wrapper and the leg wrapper at a predetermined distribution ratio.

In the disposable diaper 1 of the second aspect according to the invention as shown in FIG. 19, the line L1 is disposable diaphragm in contact with the upper edge 1a of the absorbent portion 3 and the stress relaxation structure 20. Extending from an intersection point P '(corresponding to an intersection point P of the first aspect) of the side edge of the absorbent portion 3 parallel to the longitudinal center axis L-L' of (1), and with a line ( L2 extends from the intersection point Q of the flap 4 extending along the lower end of the ear part 6 and the side edge 31 of the absorbent part 3, and the line L1 extends from the intersection point A ( Crosses the oblique edge 6a of the ear portion at the intersection point A of the first aspect, and the line L2 is the four sides at the intersection point B (corresponding to the intersection point B of the first aspect). Intersect the minor edge 6a.

The size of each of the tensile component D1 for fixing the waist wrapping portion of the absorbent portion 3 around the waist and the tensile component D2 for fixing the leg wrapping portion of the absorbent portion 3 around the legs are fasteners 7. Is fixed to the side edge 6a and the ratio of the size of the tow portion R to the size of the tow portion R overlapping the first side edge portion a and the second side edge portion b. It is determined by adjusting the ratio of the size of the tow portion R to the size of the tow portion R that overlaps. The larger the portion of the pulled portion R that overlaps the first quadrangle edge portion a, the larger the ratio of the tensile component D1 acting on the intersection point P 'to the tension applied to the fastener 7. The area defined by the line L1, the upper edge 6b of the ear part 6 and the quadrilateral edge 6a of the ear part 6 is a component distribution area 40 which fixes the waist lapping part, The portion of the quadrilateral edge 6a associated with the component distribution area 40 holding the lapping portion is the first quadratic edge a. The tension component of the tension applied to the fastener 7 is the intersection point only when the tow portion R, to which the fastener 7 is attached to the four-side edge 6a, overlaps with the first four-side edge a. It acts directly on (P '). The larger the pulled portion R portion overlapping the first quadrangle edge portion a, the larger the tensile component D1 distributed in the component distribution area 40 for fixing the waist wrapping portion.

On the other hand, the larger the portion of the towing portion R that overlaps the second bevel edge portion b, the larger the tensile component D2 acting directly on the intersection point Q. The area defined by the line L2, the lower side edge 6c of the ear part 6 and the quadrilateral edge 6a of the ear part 6 is the component distribution area 41 which fixes the leg wrapping part, and the leg The portion of the quadrilateral edge 6a associated with the component distribution area 41 for fixing the lapping portion is the second quadrilateral edge b. Only when the tow portion R overlaps the second quadrangle edge portion b, the tensile component of the tension applied to the fastener 7 acts directly on the intersection point Q. The larger the pulled portion R portion overlapping the second bevel edge portion b, the larger the tensile component D2 distributed in the component distribution area 41 for fixing the leg wrapping portion.

The ratio between the tensile component D1 distributed in the component distribution area 40 for fixing the waist lapping part and the tensile component D2 distributed in the component distribution area 41 for fixing the leg wrapping part, the fastener 7 is four sides. The ratio of the size of the tow portion R to the size of the tow portion R fixed to the sub-edge 6a and overlapping the first side edge portion a, and the second side edge portion b and It can be adjusted by adjusting the ratio of the size of the portion of the towing portion (R) to overlap the size of the towing portion (R). When the tow portion R, on which the fastener 7 is fixed to the side edge portion 6a, is completely overlapped with the first side edge portion a and partially overlaps with the second side edge portion b, Most of the tension applied to the fasteners 7 is distributed in the component distribution area 40 which secures the waist wrapping. When the tow R completely overlaps the second quadrangle edge b and partially overlaps the first quadrangle edge a, most of the tension applied to the fastener 7 causes the leg wrap to secure. It is distributed in the component distribution area 41. FIG. When the tow portion R overlaps the first side edge portion a and the second side portion edge portion b at different overlap ratios, respectively, the puller 7 is attached to the side edge portion 6a. The portion R does not necessarily need to be included in the first side edge portion a or the second side edge portion b.

Fasteners 7 are attached to the lateral edges 6a of the traction section R so as to extend perpendicular to the lateral edges 6a so that the tension applied to the fasteners 7 is the longitudinal central axis of the disposable diaper 1. The tension applied to the two fasteners 7 attached to the ear portion 6 in an oblique direction to L-L 'may be distributed at a predetermined distribution ratio at the waist wrapping portion and the leg wrapping portion.

21 and 22 illustrate a first quadrant edge a and a second quadrant edge on the position of the stress relief structure 20 of the earpiece 6 in the disposable diaper 1 of the third aspect according to the invention. The dependency dependency between the parts (b) is shown. With regard to FIG. 21, the stress relaxation structure 20 has a shape similar to a rectangle, but is different from the shape of the stress relaxation structure 20 shown in FIG. 16. In a third aspect, the line L1 extending from the intersection point P to abut the stress relaxation structure 20 and the line L2 extending from the intersection point Q to abut the stress relaxation structure 20 is an ear portion ( 6) Do not cross each other within. Line L1 and line L2 intersect the four-side edge 6a at the intersection A and the intersection B, respectively. The first quadrangle edge a extends from the intersection point A on the side of the upper edge 1a of the absorbent portion 3, and the second quadrangle edge portion b extends from the intersection point B to the absorber portion (a). An intermediate portion extending on the side of the transverse central axis H-H 'of 3) and not connected to either the component distribution area 40 for fixing the waist wrapping or the component distribution area 41 for fixing the leg wrapping. The part 33 is formed between the first side edge a and the second side edge b. The towing portion R, to which the fastener 7 is attached to the side edge 6a, must extend across the middle portion 33, and overlaps the side edges a and b so as to overlap the fastener 7. The force of the applied tension is directly concentrated on the waist and leg wraps, i.e. by positioning the tow portion R such that the tow portion R overlaps the quadrilateral edges a and b, the fastener in the desired portion. The component of tension applied in (7) can be concentrated.

In the disposable diaper 1 of the fourth aspect according to the invention shown in FIG. 22, the line L1 extends from the intersection point P to abut the stress relaxation structure 20, so that the ear canal 6 at the intersection point A. Intersect the tetragonal edge 6a of), and the line L2 extends from the intersection point Q to abut the stress relaxation structure 20 so as to intersect the extension of the quadratic edge 6a at the intersection point B do. Since the intersection B is an imaginary point away from the ear 6, the actual second quadrangle edge b 'is the portion of the second quadrangle edge b on the quadrangle edge 6a. . The fastener 7 is attached to the side edge 6a of the tow portion R partially overlapping with the first side edge a and the actual second side edge b '. Thus, even when the edges 6a do not intersect, the edges a, b may have lines L1 and L2 defined therein. In this specification, the expression ＂where the X-ray lines L1 and L2 intersect the four-side edge 6a means that the X-ray lines L1 and L2 intersect the extension of the four-side edge 6a. do.

In a fifth aspect according to the invention, the disposable diaper 1 has an ear piece 6 each having a lower side edge 6c having a lower curved portion S bent in the form of a circular arc as shown in FIG. 23. Is provided. The line L2 abuts against the lower curved portion S of the lower side edge 6c and the stress relaxation structure 20, and intersects the quadrilateral edge 6c of the ear 6 at the intersection point B. Therefore, the tension component of the tension applied to the ear portion 6 at the intersection point B can be transmitted and acted along the line L2 to the absorbent portion 3. The line 34 extending from the intersection of the lower side edge 6c of the ear piece 6 and the side flap 4 extending along the side edge of the absorber 3 so as to contact the stress relaxation structure 20 are the intersection points. Intersect the four sides edge 64 at (B '). At the intersection B ', the transfer of the tensile component of tension applied to the ear 6 and transmitted along the line 34 is interrupted at the intersection of the line 34 and the lower side edge 6c. In this aspect, the first quadratic edge a extends upwards from the intersection A and the second quadratic edge b extends downward from the intersection B. The towing portion R, to which the fastener 7 is attached to the dead edge 6a, has an intersection with the intersection point A where the first dead edge a and the second dead edge b overlap each other. Overlap (b) or more of the sections between (B)

The line L2 is the upper end of one of the elastic members 5, ie the outermost, intermediate or innermost portion of the elastic member 5 instead of the point on the lower side edge 6c so as to contact the stress relaxation structure 20. Can extend from. In this case, the tension component of the tension applied to the ear portion 6 at the intersection point B directly acts on the elastic member 5. Line L2 defines a second quadrangle edge b for directly applying tension to elastic member 5. The line L1 for determining the first quadratic edge a is the longitudinal center axis L-L 'of the absorber 3 of the sun and the upper edge 1a of the absorber 3. Although extending from the intersection point P, the line L1 is one of the elastic members (not shown) attached to the upper waist lapping portion of the absorbent portion 3 so as to contact the stress relaxation structure 20, that is, of the elastic member. The outermost, middle or innermost may extend from the right end as shown in FIG. 23. In this case, the tension component of the tension applied to the dead edge 6a at the intersection point A acts directly on the right end of the elastic member. Accordingly, the line L1 defines a first quadrant edge a for directly applying the tensile component of tension applied to the fastener 7 to the elastic member.

In the disposable diaper 1 of the sixth aspect according to the invention shown in FIG. 24, the quadrilateral edge 6a ′ of the ear canal 6 is from the outer end of the upper side edge 6b of the ear 6. It extends obliquely downward toward the longitudinal central axis L-L 'of the absorbent portion 3. The angle between the slope, i.e., the side edge 6a ', and the line passing through the outer end of the upper side edge 6b and parallel to the longitudinal central axis L-L' of the absorbent portion 3 is zero. Greater than and less than 45 The fastener 7 is attached to the side edge 6a 'of the ear 6 so as to extend perpendicular to the side edge 6a'.

When the longitudinal central axis L-L 'of the absorbent portion 3 intersects the upper edge 1a of the absorbent portion 3 at the intersection point P, the lower side edge 6c of the ear canal 6 Is attached to the side edge of the absorbent portion 3 at the intersection point Q, and the line L1 extends from the intersection point P so as to contact the upper point of the stress relaxation structure on the side of the upper edge 1a so that the intersection point A Intersect the tetragonal edge 6a ') and the line L2 intersects the lower point of the stress relaxation structure 20 on the side of the transverse central axis H-H' of the absorber 3. Extend from (Q) to intersect the bevel edge 6a 'at the intersection B, the first bevel edge a extends obliquely upward at the intersection A, and the second bevel edge b ) Extends obliquely downward from the intersection point B.

The fastener 7 is attached to the side edge 1a 'of the ear 6 so as to extend perpendicular to the side edge 6a'. Since the fasteners 7 are pulled in the direction perpendicular to the four edges 6a 'of the ear piece 6, the longitudinal central axis L-L' of the absorbent part 3 from which the fasteners 7 are pulled out. The direction from is dependent on the inclination of the quadrilateral edge 6a 'which is greater than zero and less than 45. The fastener 7 is pulled perpendicularly to the quadrilateral edge 6a 'regardless of the inclination of the quadrilateral edge 6a' of the ear piece 6. Accordingly, the direction with respect to the longitudinal center line L-L 'from which the fastener 7 is pulled depends on the inclination of the side edge 6a', and the inclination of the side edge 6a 'is relatively small. , The difference between the tensile component D1 of the tension distributed in the waist lapping part and applied to the fastener 7 and the tensile component D2 of the tension distributed in the leg lapping part and applied to the fastener 7 is small; When the slope of ') is relatively large, the tensile component D1 is larger than the tensile component D2. The fastener 7 is attached to the side edge 6a ′ of the ear 6 in the tow R. The ratio of the tensile component D1 and the tensile component D2 depends on the position of the towing portion on the quadrilateral edge 6a '.

As shown in FIG. 1, the fastener 7 of the disposable diaper 1 is folded back in the middle in the packaging and protrudes from the ear piece 6 when the disposable diaper is unfolded for use. The fastener 7 may be in the form of a fork. In this way, when folded back from the middle, the part of the fastener 7 does not protrude from the ear portion 6 at all. When the fastener 7 is in the form of a fork, the tension applied to the fastener 7 can be more reliably distributed in the waist wrap and leg wrap. Since the stress relaxation structure 20 is elastic, the stress relaxation structure 20 is more easily adapted to the shape of the sciatic or the like to improve the wear stability of the wearer. While the present invention has been described in some specific and preferred forms, many variations and modifications are certainly possible. Accordingly, it should be understood that the invention may be practiced otherwise than as specifically described herein without departing from the scope and spirit of the invention.

Claims (25)

Absorbent cores are formed by sandwiching the absorbent core between the topsheet and the backsheet so that when worn on the wearer, the absorbent core can correspond to the wearer's crotch, the absorbent core having a first longitudinal end edge and a second longitudinal end edge. part; A pair of ear-shaped portions projecting in opposite directions from each of the opposite side edges of the one longitudinal distal end of the absorbent portion on the first longitudinal distal edge side; And one fastening means attached to each oblique side edge of the ear canal, Each of the four edges of the ear portion to which the fastening means is attached is inclined to extend at a predetermined angle with respect to the longitudinal central axis of the absorbent portion, Each of the fastening means is attached to the quadrilateral edge of the ear canal so as to extend perpendicular to the corresponding quadrilateral edge, Each ear portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, Each fastening means is attached to the ear at the tow of the four side edges of the ear overlapping with at least a portion of the first side edge and a portion of the second side edge on the four edges of the ear, The first longitudinal end of the absorbent portion from the intersection of the first boundary and the quadrilateral edge extending from the point on the first longitudinal end edge to contact the point on the stress relaxation structure on the side of the first longitudinal end edge. Extending on the sides of the edges, The second side edge portion from the intersection of the second boundary line and the quadrilateral edge, the lower end of the ear extending from the point on the absorber side edge connected with the absorber so as to contact a point on the stress relaxation structure on the side of the transverse centerline; Extending on the side of the lateral central axis perpendicular to the longitudinal central axis Disposable diapers. The method of claim 1, A disposable diaper, wherein the point on the first longitudinal end edge from which the first boundary extends corresponds to the intersection of the longitudinal central axis and the first longitudinal end edge. The method of claim 1, And the point on the first longitudinal end edge from which the first boundary extends is the intersection of the first longitudinal end edge of the absorber and the side edge of the absorber on the ear side. The method of claim 1, A disposable diaper, wherein the periphery of the ear portion is not extensible and the stress relaxation structure is extensible. The method of claim 4, wherein Disposable diapers, each of which is formed of an unstretchable material, is formed by processing an unstretchable material to be extensible when the stress relaxation structure is under tension, and the stress relaxation structure does not shrink the periphery of the ear portion . The method of claim 5, A disposable diaper, wherein each of the earpieces is a laminated structure comprising a liquid impermeable film, a porous film and a nonwoven fabric. The method of claim 1, And the periphery of each ear portion yields and elongates high tensile stress, and the stress relaxation structure yields and elongates low tensile stress. The method of claim 1, And wherein the oblique side edges of each ear portion are inclined away from the longitudinal central axis of the absorber at an angle greater than 0 and less than 45 with respect to a straight line parallel to the longitudinal central axis of the absorbent portion. The method of claim 8, A disposable diaper, wherein the tow portion overlapped with the first quadrangle edge portion, wherein the fastening means is attached to the four-edge edge of the ear portion, is larger than the tow portion portion overlapped with the second four-edge edge portion. The method of claim 9, A towing portion having the fastening means attached to the lateral edge of the ear portion is included in the first lateral edge and partially overlaps with the second lateral edge. The method of claim 1, And wherein the oblique edge of each ear portion is inclined toward the longitudinal central axis of the absorbent portion at an angle greater than 0 and less than 45 with respect to a straight line parallel to the longitudinal central axis of the absorbent portion. The method of claim 11, A disposable diaper, wherein the tow portion overlapped with the second quadrant edge portion, wherein the fastening means is attached to the oblong edge of the ear portion, is larger than the tow portion overlapped with the first tetragon edge. The method of claim 12, A towing portion having said fastening means attached to the lateral edge of the ear portion is included in the second lateral edge and partially overlaps with the first lateral edge. When worn on the wearer, the absorbent core is formed by sandwiching the absorbent core between the topsheet and the backsheet so as to correspond to the wearer's crotch, the first longitudinal end edge, the second longitudinal end edge, and the first longitudinal end. An absorbent portion having a first waist wrapping section coupled to the edge, a second waist wrapping portion connected to the second longitudinal end edge and a crotch wrapping portion extending between the first waist wrapping portion and the second waist wrapping portion; A pair of ear portions protruding from opposite side edges of the first waist wrapping portion of the absorbent portion; And one fastening means attached to each of the four edges of the ear canal; Each of the four edges of the ear portion to which the fastening means is attached is inclined at a predetermined angle with respect to the longitudinal central axis of the absorbent portion, Fastening means are respectively attached to the four edges of the ear portion so as to extend perpendicular to the corresponding four edges, Each ear portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, The first waist wrap portion extending on the side of the first longitudinal distal edge from a first boundary extending from the point on the first longitudinal distal edge to contact a point on the stress relaxation structure on the side of the first longitudinal distal edge. Waist wrapping component distribution area where the tensile component of tension applied to the fastening means directly acts, The tetragonal edge of the ear portion corresponding to the waist lapping component distribution area is the first tetragonal edge, A first waist portion extending on the side of the crotch wrapping from a second boundary line extending from the point on the side edge of the absorbent portion connected to the absorbing portion so as to contact a point on the stress relaxation structure on the side of the crotch wrapping portion. The leg wrapping component distribution area where the tensile component of tension applied to the ning means acts directly, The quadrilateral edge of the ear portion corresponding to the leg lapping component distribution area is the second quadrilateral edge, Each fastening means is attached to the ear at the tow of the quadrilateral edge of the ear overlapping at least a portion of the first side edge and a portion of the second side edge. Disposable diapers. The method of claim 14, A disposable diaper, wherein a point on the first longitudinal end edge from which the first boundary extends corresponds to the intersection of the longitudinal central axis of the absorbent portion and the longitudinal end edge. The method of claim 14, A disposable diaper, wherein the point on the first longitudinal end edge from which the first boundary extends is the intersection of the first longitudinal end edge of the absorber and the side edge of the absorber on the ear side. The method of claim 14, And wherein the oblique side edges of each ear portion are inclined away from the longitudinal central axis of the absorber at an angle greater than 0 and less than 45 with respect to a straight line parallel to the longitudinal central axis of the absorbent portion. The method of claim 17, A disposable diaper, wherein the tow portion overlapped with the first quadrangle edge portion, wherein the fastening means is attached to the four-edge edge of the ear portion, is larger than the tow portion portion overlapped with the second four-edge edge portion. The method of claim 18, A towing portion having the fastening means attached to the lateral edge of the ear portion is included in the first lateral edge and partially overlaps with the second lateral edge. The method of claim 14, And wherein the oblique edge of each ear portion is inclined toward the longitudinal central axis of the absorbent portion at an angle greater than 0 and less than 45 with respect to a straight line parallel to the longitudinal central axis of the absorbent portion. The method of claim 20, A disposable diaper with a fastening means attached to the oblong edge of the ear portion, wherein the tow portion overlapping with the second bevel edge is larger than the tow portion overlapping with the first bevel edge. The method of claim 12, A towing portion having the fastening means attached to the lateral edge of the ear portion is included in the second lateral edge and partially overlaps with the first lateral edge. When worn on the wearer, the absorbent core is formed by sandwiching the absorbent core between the topsheet and the backsheet so as to correspond to the wearer's crotch, the first longitudinal end edge, the second longitudinal end edge, and the first longitudinal end. An absorbent portion having a first waist wrapping portion connected to the edge, a second waist wrapping portion connected to the second longitudinal end edge and a crotch wrapping portion extending between the first waist wrapping portion and the second waist wrapping portion; Elastic leg fastening means respectively extending along opposite side edges of the crotch wrapping of the absorbent portion; A pair of ear portions protruding from opposite side edges of the first waist wrapping portion of the absorbent portion; And fastening means attached to each of the four edges of the ear canal; Each of the four edges of the ear portion to which the fastening means is attached is inclined at a predetermined angle with respect to the longitudinal central axis of the absorbent portion, Each of the fastening means is attached to the quadrilateral edge of the ear canal so as to extend perpendicular to the corresponding quadrilateral edge, Each ear portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, The first waist wrap portion extending on the side of the first longitudinal distal edge from a first boundary extending from the point on the first longitudinal distal edge to contact a point on the stress relaxation structure on the side of the first longitudinal distal edge. Waist wrapping component distribution area where the tensile component of tension applied to the fastening means directly acts, The tetragonal edge of the ear portion corresponding to the waist lapping component distribution area is the first tetragonal edge, The first waist portion extending on the side of the crotch wrapping from a second boundary extending from one end of the leg fastening means on the side of the first longitudinal side edge to contact a point on the stress relaxation structure on the side of the crotch wrapping. The leg wrapping component distribution area where the tensile component of tension applied to the fastening means directly acts, The quadrilateral edge of the ear portion corresponding to the leg lapping component distribution area is the second quadrilateral edge, Each fastening means is attached to the ear portion at the tow of the side edge of the ear portion overlapping with at least a portion of the first side edge portion and a portion of the second side edge portion. Disposable diapers. When worn on the wearer, the absorbent core is formed by sandwiching the absorbent core between the topsheet and the backsheet so as to correspond to the wearer's crotch, the first longitudinal end edge, the second longitudinal end edge, and the first longitudinal end. An absorbent portion having a first waist wrap portion connected to the edge, a second waist wrap portion connected to the second longitudinal end edge and a crotch wrap portion extending between the first waist wrap portion and the second waist wrap portion; Elastic waist fastening means extending along the first longitudinal distal edge at the first waist wrap; A pair of ear portions protruding from opposite side edges of the first waist wrapping portion of the absorbent portion; And fastening means attached to each of the four edges of the ear canal; The four edges of the ear portion to which the fastening means are attached are each inclined at a predetermined angle with respect to the longitudinal central axis of the absorbent portion, Each of the fastening means is attached to the quadrilateral edge of the ear canal so as to extend perpendicular to the corresponding quadrilateral edge, Each ear portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, An extension extending on the side of the first longitudinal distal edge from a first boundary extending from one end of the elastic waist fastening means on the side of the ear to contact a point on the stress relaxation structure on the side of the first longitudinal distal edge; 1 the waist wrapping portion is a waist wrapping component distribution area for directly applying a tensile component of tension applied to the fastening means to one end of the elastic waist fastening means, The tetragonal edge of the ear portion corresponding to the waist lapping component distribution area is the first tetragonal edge, The first waist wrap portion extending on the side of the crotch wrapper from a second boundary extending from the point on the side edge of the ear on the crotch wrap side to contact a point on the stress relaxation structure on the crotch wrap side. Leg wrapping component distribution area for directly applying the tensile component of tension applied to the point on the side edge of the ear portion on the crotch wrapping portion side, The quadrilateral edge of the ear portion corresponding to the leg lapping component distribution area is the second quadrilateral edge, Each fastening means is attached to the ear portion at the tow of the side edge of the ear portion overlapping with at least a portion of the first side edge portion and a portion of the second side edge portion. Disposable diapers. When worn on the wearer, the absorbent core is formed by sandwiching the absorbent core between the topsheet and the backsheet so as to correspond to the wearer's crotch, the first longitudinal end edge, the second longitudinal end edge, and the first longitudinal end. An absorbent portion having a first waist wrapping portion connected to the edge, a second waist wrapping portion connected to the second longitudinal end edge and a crotch wrapping portion extending between the first waist wrapping portion and the second waist wrapping portion; Elastic leg fastening means extending along the opposite longitudinal side edge of the crotch wrapping; Elastic waist fastening means extending from the first waist wrap portion along the first longitudinal distal edge of the absorbent portion; A pair of ear portions attached to the first waist wrapping portion of the absorbent portion; And fastening means attached to each of the four edges of the ear canal; Each of the four edges of the ear portion to which the fastening means is attached is inclined at a predetermined angle with respect to the longitudinal central axis of the absorbent portion, Each of the fastening means is attached to the ear piece so as to extend perpendicular to the corresponding quadrilateral edge, Each ear portion has a stress relaxation structure in which a tensile stress less than the tensile stress induced at the periphery of the ear portion is induced at a portion other than the periphery, A first waist extending on the side of the first longitudinal distal edge from a first boundary extending from one end of the elastic waist fastening means on the ear side to contact a point on the stress relaxation structure on the first longitudinal distal edge side; The wrapping portion is a waist wrapping component distribution area for directly applying a tensile component of tension applied to the fastening means to one end of the elastic waist fastening means, The tetragonal edge of the ear portion corresponding to the waist lapping component distribution area is the first tetragonal edge, The first waist portion extending on the side of the crotch wrapping from a second boundary extending from one end of the resilient leg fastening means on the side of the first longitudinal side edge to contact a point on the stress relaxation structure on the side of the crotch wrapping. A leg wrapping component distribution area for directly applying a tensile component of tension applied to the fastening means to one end of the elastic leg fastening means, The quadrilateral edge of the ear portion corresponding to the leg lapping component distribution area is the second quadrilateral edge, Each fastening means is attached to the ear portion at the tow of the side edge of the ear portion overlapping with at least a portion of the first side edge portion and a portion of the second side edge portion. Disposable diapers.

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