JP4732497B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles for women such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood, vaginal discharge, and the like.

  Conventionally, as an absorbent article 50 such as a sanitary napkin, a panty liner, a cage sheet, an incontinence pad, etc., as shown in FIG. 7, for example, a liquid-impermeable back sheet made of a polyethylene sheet or a polyethylene laminated nonwoven fabric, etc. 51 and a crotch of underwear at the time of wearing, respectively, on both sides of the main body part in which an absorbent body 53 made of cotton-like pulp is interposed between a non-woven fabric or a liquid-permeable surface sheet 52 made of a porous plastic sheet or the like The wing-shaped flaps 54 and 54 are formed to be fixed so as to entrain the portion, and the hip-hold flaps are fixed to the inner side of the buttock of the underwear when worn on both sides of the main body portion on the rear side. One in which 55 and 55 are formed is known.

  In this type of absorbent article 50, in order to prevent misalignment in the mounted state, for example, one or a plurality of adhesive layers 56 are formed on the non-skin contact surface side (outer surface of the back sheet 51) of the main body portion. In addition, pressure-sensitive adhesive layers 57, 57 and 58, 58 are provided on the surfaces (outer surfaces) of the wing-shaped flaps 54, 54 and hip-hold flaps 55, 55 on the back sheet 51 side, respectively.

  When the absorbent article 50 is fixed to the undergarment 30, as shown in FIG. 8, the absorbent article 50 is locally applied and the wing-shaped flaps 54, 54 protruding sideways are taken out from the underwear, Wrap the wing-shaped flaps 54, 54 along fold lines RL, RL, and wrap around the crotch portion of the underwear while adhering the wings-stopping adhesive layers 57, 57 to the outer surface of the crotch portion of the underwear 30, and at the same time for the hip hold The flaps 55, 55 are expanded at the buttock portion, and the hips-stopping adhesive layers 58, 58 are adhered to the inner surface of the heel portion of the underwear 30.

  On the other hand, when the absorbent article 50 is individually packaged, the flap portions 54 and 55 on both sides are folded inside, and the adhesive layers 56... 57. In addition, the packaging sheet is arranged on the outer surface side of the absorbent article 50, the absorbent article 50, the release paper, and the packaging sheet are both folded in multiple in the longitudinal direction, and the side edge portion is heat-sealed. The opening part is fixed with a tag tape or the like.

  However, when the absorbent article 50 is folded in the above-described individual packaging state, when opened, creases and wrinkles remain particularly in the flap portions on both sides, causing a deterioration in wearing feeling.

  In order to prevent the occurrence of such creases and wrinkles, various forms have been proposed. For example, in Patent Document 1 listed below, an absorption body that is individually packaged by folding the flaps of the left and right side edges in the longitudinal direction of the absorbent main body toward the skin contact surface side, and performing uneven processing on the folding axis of the flap and / or its vicinity. A packaging structure for a functional article is disclosed.

Moreover, in the following Patent Document 2, a fold extending in the width direction is formed in the rear wing by being folded and wrapped in the longitudinal direction at least once, so that the fold in the rear wing is not included. An absorbent article is disclosed in which a highly rigid portion having high bending strength is provided in the wing.
JP 2006-192261 A JP 2008-188181 A

  However, in the case of the above-mentioned Patent Document 1, uneven processing is performed in the vicinity of the folding shaft when the flaps on both sides are folded to the skin contact surface side, the folding shaft to the skin contact surface side of the flap portion, and physiological By arranging the concavo-convex pattern in the region intersecting with the folding axis that folds the napkin and the packaging sheet in the direction orthogonal to the longitudinal direction, the folds are dispersed so as not to cause strong folds in this region It is a thing. That is, by performing such uneven processing, creases around the folding axis of the flap may be reduced, but creases and wrinkles generated at both end portions of the flap portion cannot be prevented.

  In the case of the above-mentioned Patent Document 2, since the high-rigidity portion is provided so as not to include a crease, the crease portion where the crease or wrinkle is most likely to occur is low in rigidity. It is not a measure to prevent wrinkles.

  Therefore, a main problem of the present invention is to provide an absorbent article that prevents creases and wrinkles generated in the flap portion when the absorbent article is individually mounted for the purpose of reducing the uncomfortable feeling at the time of wearing. is there.

In order to solve the above-mentioned problem, as the present invention according to claim 1, there are flap portions where the absorber is not interposed respectively on both sides of the main body portion where the absorber is interposed between the liquid-permeable top sheet and the back sheet. The flap portion includes a wing-shaped flap that is fixed so as to wind at least the crotch portion of the underwear when worn, and each of the flap portions is folded back to the main body portion side and at the position of the widthwise fold line. In the absorbent article that is folded in the longitudinal direction and is individually packaged,
In the unfolded state, the absorbent article has a width in a width direction between both side edges of a region corresponding to the width direction fold line position in the flap portion on the front side and the rear side of the wing-shaped flap. An absorbent article characterized by being formed so as to be relatively smaller than the length in the direction is provided.

  In the invention according to claim 1, in the absorbent article, in the developed state, the width direction length between both side edges of the region corresponding to the width direction fold line position is relatively larger than the width direction length of the front and rear regions. Since it is formed so as to be smaller, each of the flap portions is folded back to the main body portion side, and when folded in the longitudinal direction at the position of the width direction fold line to be individually packaged, at the position of the width direction fold line The formation of wrinkles due to the doweling of the flap portion is greatly reduced, so that even if the flap portion is expanded after opening, no creases or wrinkles remain on the flap portion, so that it can be mounted without a sense of incongruity.

  According to a second aspect of the present invention, the side edge of the flap portion of the region corresponding to the widthwise fold line position is provided with a concave portion that is relatively recessed from the front and rear regions thereof, so that the width in the unfolded state is provided. The absorbent article according to claim 1, wherein the widthwise length between both side edges of the region corresponding to the direction fold line position is formed to be relatively smaller than the widthwise length of the front and back regions. .

  In the invention according to claim 2, as a specific structure for achieving the length in the width direction according to claim 1, the front and back regions of the side portion of the flap portion of the region corresponding to the width direction fold line position are provided. A relatively recessed recess is provided.

As the present invention according to claim 3, each of the flaps is folded back to the main body portion side at the position of the longitudinal fold line outside the absorber side edge,
The absorbent article according to any one of claims 1 and 2, wherein a recessed portion recessed inward is formed at a portion where the longitudinal fold line and the outer shape line of the absorbent article intersect in an unfolded state. The

  In the invention described in claim 3, when the flap portions on both sides are folded in the width direction, the longitudinal fold line and the outer shape of the absorbent article are formed in order to prevent creases formed at the front and rear edges. In the part where the line intersects, a concave part recessed inward is formed.

As a fourth aspect of the present invention, a wing-like flap fixed to the flap portion so as to wrap around the crotch portion of the underwear is attached to the flap portion, and is fixed to the inner surface side of the heel portion of the underwear at the rear side. A hip hold flap is formed,
The width-direction fold line is located on the hip-hold flap, the point on the outline line where the width-direction length at the rear base of the wing-shaped flap is minimal, and the width-direction length of the hip-hold flap is The absorptive article according to any one of claims 1 to 3 in which a straight line connecting points on a contour line that becomes a maximum is inclined outwardly within a range of 10 ° to 15 ° with respect to a longitudinal line. The

  In the invention described in claim 4, when the hip hold flap is folded with a sailor, the straight line connecting the points is 10 ° to 15 ° outward with respect to the longitudinal line so that the flap portion can be easily folded without wrinkles. Inclined within the range of °.

  As described above in detail, according to the present invention, when the absorbent article is individually packaged, it is possible to prevent creases and wrinkles generated in the flap portion, and to reduce the uncomfortable feeling at the time of wearing.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially broken development view in which a sanitary napkin 1 according to the present invention is arranged on a packaging sheet 10 in an unfolded state.

The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, and the like, a liquid-permeable top sheet 3 that allows permeation of menstrual blood, cages, and the like, and both the sheets 2, It is comprised from the absorber 4 which consists of cotton-like pulp, synthetic pulp, etc. interposed between 3 and the side nonwoven fabric 6 formed along the longitudinal direction in the surface side both sides, respectively. The side edges in the longitudinal direction of the main body part in which the absorbent body 4 is interposed between the top sheet 3 and the back sheet 2, respectively, protrude sideways by the bonded portion of the back sheet 2 and the side nonwoven fabric 6, respectively. A flap portion not formed with the absorbent body 4 is formed, and the wing-like flaps W and W fixed so as to entrain the crotch portion of the underwear at the time of wearing, and the main body on the rear side of the flap portion. Hip holding flaps W _B and W _B that are fixed to the inner surface side of the underwear at the time of wearing are included at both side edges in the longitudinal direction of the portion. The absorbent body 4 can be surrounded by crepe paper for shape retention and diffusibility improvement.

Moreover, the wing-shaped flaps W, the surface (back surface) of the backsheet 2 side of the W, together with the wing-fixing adhesive layer 8, 8 are formed, hip hold flaps W _B, W backsheet 2 of _B On the side surface (back surface), hip-slipping prevention adhesive layers 8B and 8B are formed. In addition, the back surface of the main body portion in which the absorbent body 4 is interposed between the top sheet 3 and the back sheet 2 is provided with a plurality of strips according to an appropriate application pattern for fixing to the underwear, and in the illustrated example, three strip bodies. Displacement prevention adhesive layers 7, 7,... Are formed.

As shown in FIG. 1, the sanitary napkin 1 is disposed on the packaging sheet 10 via a release paper 5 that releasably covers the main-body displacement preventing adhesive layer 7. as such, the wing-shaped flaps W, W and hip hold flaps W _B, W _B are respectively at the outer longitudinal fold lines L3, L3 position from both side edges of the absorbent body 4, the surface of the topsheet 3 side The pair of wings-stop adhesive layers 8 and 8 are releasably covered by the wings-stop adhesive layer release paper 11 and the pair of hips-stop adhesive layers 8B and 8B. Is releasably covered by the release paper 12 for hips-stopping adhesive layer, and is further folded in three in the longitudinal direction at the positions of the width direction fold lines L1 and L2, and as shown in FIG. 10a together with the heat-sealed, unsealed portion is that it is secured by the tag tape 15 individually packaged state.

  In the present invention, in particular, in order to prevent folding and wrinkling of the flap portion when the individual packaging state is set, the flap portion is provided with a predetermined crease prevention structure described in detail later.

Hereinafter, the structure of the sanitary napkin 1 and the like will be described in detail.
The back sheet 2 is made of a sheet material having at least a water shielding property such as an olefin resin sheet such as polyethylene or polypropylene. In addition to this, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, and further a waterproof film is interposed. Thus, after substantially ensuring liquid impermeability, a non-woven sheet (in this case, a waterproof film and a non-woven fabric constitute a liquid impermeable back sheet) can be used. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is. In particular, in the present invention, in order to reduce creases and wrinkles in the flap portion, the backsheet 2 is made of a polylaminated nonwoven fabric in which a plastic film and a nonwoven fabric are laminated, so that the flap portion has a stiffness. Is desirable.

  Next, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used as the top sheet 3. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.

  The absorber 4 interposed between the said back surface sheet 2 and the surface sheet 3 is comprised by the fluffy pulp and the water absorbing polymer, for example. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. When the crepe paper surrounding the absorber 4 is provided as in this example, the crepe paper intervenes between the liquid-permeable surface sheet 3 and the absorber 4 as a result, and the absorbency is excellent. The crepe paper quickly diffuses body fluid and prevents reversal of these menstrual blood and the like.

  Further, synthetic fibers may be mixed in the absorbent body 4. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

As the side nonwoven fabric 6, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Moreover, the wing-shaped flaps W, W and / or hip hold flaps W _B, if emphasize absorbent such as menstrual blood in W _B, compounds having a hydrophilic group in the process of manufacturing synthetic fiber, for example, polyethylene glycol Synthetic fibers can be swollen by a method of polymerizing in the presence of an oxidation product or a method of treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing a metal hydroxide. It is desirable to use a hydrophilic treated nonwoven fabric that is porous and hydrophilic by applying capillary action. In particular, in the present invention, in order to reduce creases and wrinkles in the flap portion, it is desirable to use a soft air-through nonwoven fabric as the side nonwoven fabric 6 that is difficult to crease and wrinkle.

  As the pressure-sensitive adhesive that forms the anti-displacement pressure-sensitive adhesive layers 7, 8, and 8B, for example, a styrenic polymer, a tackifier, or a plasticizer mainly used is preferably used. Examples of the styrenic polymer include styrene-ethylene-butylene-styrene block copolymers, styrene-butylene-styrene block copolymers, and styrene-isobutylene-styrene copolymers. It may be used or two or more polymer blends. Among these, a styrene-ethylene-butylene-styrene block copolymer is preferable in terms of good thermal stability. As the tackifier and plasticizer, those that are solid at room temperature can be preferably used. Examples of the tackifier include C5 petroleum resins, C9 petroleum resins, dicyclopentadiene petroleum resins, and rosin petroleum resins. Polyterpene resin, terpene phenol resin, etc., and examples of the plasticizer include monomer plasticizers such as trifresil phosphate, dibutyl phthalate, dioctyl phthalate, and polymer plasticizers such as vinyl polymers and polyesters. It is done.

  As the release paper 11 for the wings-stopping adhesive layer and the release paper 12 for the hips-stopping adhesive layer, for example, a silicone-based resin, a fluorine-based resin, or a four-sided contact surface with respect to the slip-stopping adhesive layers 8 and 8B. A paper or plastic sheet that has been subjected to a release treatment such as a release treatment solution such as a fluoroethylene resin or spray applied can be used. It should be noted that the film itself or the nonwoven fabric itself may be used as long as it does not cause a substantial decrease in the adhesive force without special release treatment.

  As shown in FIG. 2, the packaging sheet 10 for individually mounting the sanitary napkin 1 has a predetermined front, rear, left, and right sides with respect to the planar dimension of the napkin 1 in a state where the flap portions on both sides are folded back to the surface on the surface sheet 3 side. The sheet is formed in a substantially rectangular shape having a size larger than that of the sheet. As a material, a plastic film or a non-woven fabric can be used, but preferably it is thin and highly flexible in that the tearing sound at the time of opening can be reduced and the contact sound with other objects can be reduced at the time of carrying. It is good to use a nonwoven fabric. The width dimension of the said packaging sheet 10 is taken as the dimension which the sealing means mentioned later is ensured.

  On the contact surface of the packaging sheet 10 on the napkin 1 side, the release paper 5 that has been subjected to the same release treatment as described above with respect to the contact surface with respect to the main body displacement prevention adhesive layer 7. It is the magnitude | size which covers the formation range of agent layer 7,7 ..., and is adhere | attached with adhesives, such as hot melt. The release treatment of the release paper 5 is performed only on the surface covering the pressure-sensitive adhesive layer 7 of the napkin 1, and the surface to be bonded to the packaging sheet 10 on the opposite side is provided with the packaging sheet 10 and In order to ensure the adhesive property, the release treatment is not performed. The packaging sheet 10 and the release paper 5 are bonded to each other at an appropriate place, specifically, several places in the longitudinal direction.

Further, a tag tape 15 is provided in the approximate center of the short side edge of the packaging sheet 10. The tag tape 15 is a member made of paper, plastic film, or the like. The base end side is bonded to the packaging sheet 10 so as not to be peeled off, a peelable adhesive layer is provided on the protruding portion, and the tip portion is non-adhesive. The knob part is formed.
[Folding prevention structure]
As shown in FIG. 1, in the folded state of the sanitary napkin 1, the crease prevention structure has a width direction length between both side edges of a region corresponding to the position of the width direction fold lines L1 and L2. The structure is relatively smaller than the length in the width direction of the region. Specifically, in the width direction folding line L1 on the rear side of the sanitary napkin 1, the length in the width direction B _B between both side edges of the region corresponding to the folding line L1 position, widthwise length of the front and rear regions It is formed so as to be relatively smaller than the height A _B , that is, a relationship of A _B > B _B. Further, in the width direction fold line L2 on the front side, the width direction length B of the region corresponding to the position of the fold line L2 is relatively smaller than the width direction length A of the front and rear regions (A> B). Is formed.

Here, in the example shown in FIG. 1, in each of the folding lines L1, L2, A widthwise length before and after the region of fold lines, respectively, but are formed by a length substantially equal and A _B, folding each The width direction length in the front region from the line position may be different from the width direction length in the rear region. For example, in the sanitary napkin 1B shown in FIG. 6, in the width direction folding line L1 of the rear, the folding line L1 widthwise length A _'B in the front region from the position is, the width direction in the rear region length is formed to be smaller than the a _B, in the width direction fold line L2 of the front, the folding line L2 widthwise length a in the front region of the position 'is smaller than the widthwise length of the rear region a as Is formed.

  In order to make the length in the width direction of the fold line position relatively smaller than the width direction length of the front and rear area thereof, relative to the both side edges of the flap portion of the area corresponding to the width direction fold line position, relative to the front and rear area. Provide a recessed recess. In the illustrated example, concave portions 20 are provided on both side edges of the flap portion in the region corresponding to the rear width direction fold line L1 position, and on both side edges of the flap portion in the region corresponding to the front width direction fold line L2 position. Is provided with a recess 21.

  Thus, by providing the recesses 20 and 21 and making the length in the width direction have the above relationship, as shown in FIG. 2, the area of the flap portion that is folded to the surface side is the width of the folding lines L1 and L2 in the width direction. Since the area is smaller than the front and rear areas, even when folded in the longitudinal direction at the positions of the width direction fold lines L1, L2, the occurrence of wrinkles due to the dowels at the fold line position is greatly reduced. Therefore, even if the flap part is unfolded after opening, no creases or wrinkles remain on the flap part, and it can be attached without a sense of incongruity.

  FIG. 4 is a development view of another form of the sanitary napkin 1A. The sanitary napkin 1A of the present embodiment is formed by forming indented recesses 22 and 23 at portions where the longitudinal fold lines L3 and L3 and the outline of the sanitary napkin 1A intersect in the deployed state ( For details, see the enlarged view of FIG. As a result, even when the flap portion is folded at the positions of the longitudinal fold lines L3 and L3, no creases are generated at the front and rear ends, and creases and wrinkles can be prevented.

Furthermore, FIG. 6 is a developed view of another form of the sanitary napkin 1B. The sanitary napkin 1B of the present embodiment is a preferred embodiment particularly when the width-direction fold line L1 is located on the hip-hold flaps W _B and W _B , and the width direction length at the rear base portion of the wing-shaped flap W the point P ₀ of the contour line as the Saga minimum width direction length a _B in Hip hold flaps W _B, 'P points of the profile line _{of B} is maximum, P' a straight line R connecting the and the longitudinal It is formed so as to be inclined outwardly within a range of 10 ° to 15 ° with respect to the direction line R ₀ . Thus, when folded toward the rear side hip hold flaps W _B from the front side in the sailor, since it is formed so begin folding area of the flap portion is increased in the rear small, the flap portion is easily folding, wrinkle It becomes difficult to become.

[Other examples]
(1) In the above embodiment, the flap portions on both sides are folded back on the surface on the surface sheet 3 side by so-called belly folds at the positions of the longitudinal fold lines L3 and L3 outside the both side edges of the absorbent body 4, respectively. However, the flap portions on both sides may be folded back to the surface on the back sheet 2 side by so-called back folding.
(2) In the above embodiment, the wing-like flaps W to the flap portion of the sides of the napkin body, W and hip hold flaps W _B, was a napkin W _B are formed, the flaps W _B for hip _hold, W _B but also not formed napkins, wing-shaped flaps W, W and hip hold flaps W _B, can be likewise applied to the napkin W _B is not formed.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is a top view which shows the individual packaging point of the sanitary napkin 1. FIG. It is a perspective view which shows an individual packaging state. It is an expanded view of 1 A of sanitary napkins of other forms. It is the V section enlarged view of FIG. It is an expanded view of the sanitary napkin 1B of the other form. It is an expanded view of the conventional absorbent article 50. It is a wearing state figure of absorptive article 50.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Back sheet, 3 ... Top sheet, 4 ... Absorber, 5 ... Release paper, 7 ... Main body slip prevention adhesive layer, 8 ... Wings slip prevention adhesive layer, 8B ... Hips slip prevention adhesive Layer 10, packaging sheet, 11, release paper for adhesive layer for preventing wings, 12, release paper for adhesive layer for preventing hips, 15, tag tape, L 1, L 2, fold line in width direction, L 3, fold line in longitudinal direction , W ... Wing-shaped flap, W _B ... Hip hold flap

Claims (4)

Flap portions that do not interpose the absorber are formed on both sides of the main body portion where the absorber is interposed between the liquid-permeable surface sheet and the back sheet, respectively, and the flap portion entrains the crotch portion of the underwear at least when worn In the absorbent article including the wing-shaped flaps fixed in this manner, the flap portions are folded back to the main body portion side and folded in the longitudinal direction at the position of the width direction fold line. ,
In the unfolded state, the absorbent article has a width in a width direction between both side edges of a region corresponding to the width direction fold line position in the flap portion on the front side and the rear side of the wing-shaped flap. An absorbent article characterized by being formed to be relatively smaller than a length in a direction.   By providing a concave portion that is relatively recessed from the front and rear regions at the side edge of the flap portion of the region corresponding to the width direction fold line position, the region corresponding to the width direction fold line position in the expanded state is provided. The absorbent article according to claim 1, wherein the widthwise length between both side edges is formed to be relatively smaller than the widthwise length of the front and rear regions. Each of the flap portions is folded back to the main body portion side at the position of the longitudinal fold line outside the absorber side edge,
The absorbent article according to any one of claims 1 and 2, wherein a recessed part recessed inward is formed at a portion where the longitudinal fold line and the outer shape line of the absorbent article intersect in the unfolded state. The flap portion is formed with a wing-shaped flap that is fixed so as to wind the crotch portion of the underwear when worn, and a hip hold flap that is fixed to the inner side of the buttocks when worn behind it.
The width-direction fold line is located on the hip-hold flap, the point on the outline line where the width-direction length at the rear base of the wing-shaped flap is minimal, and the width-direction length of the hip-hold flap is The absorbent article in any one of Claims 1-3 in which the straight line which connected the point on the outline line used as local maximum inclines in the range of 10 degrees-15 degrees outside with respect to a longitudinal direction line.

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