JP6273391B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, etc. for absorbing menstrual blood, cages, and the like, and more specifically, absorbent articles having three-dimensional gathers on both sides of the absorbent article. About.

  Conventionally, as absorbent articles such as panty liners, sanitary napkins, incontinence pads, liquid-impervious back sheets such as polyethylene sheets or polyethylene sheet-laminated nonwoven fabrics, and liquid-permeable surface sheets such as nonwoven fabrics or liquid-permeable plastic sheets In this case, an absorbent body made of paper cotton such as pulverized pulp is interposed therebetween.

  Numerous improvements have been made to this type of absorbent article, and when worn, the contours on both sides in the longitudinal direction of the absorbent article and the free end of the three-dimensional gather contact the base of the leg, causing pain and discomfort to the crotch. Various measures are taken to reduce this. For example, in the following Patent Document 1, the liquid-permeable top sheet and the liquid-impervious back sheet are formed in a shape in which both side edges follow the longitudinal direction of the absorbent article, and protrude outward from the both side edges. There is disclosed an absorbent article in which a frill made of a nonwoven fabric in which an outer line forms a wavy line by repeating a convex curve and a concave curve along both longitudinal sides of the article is disclosed.

  Further, in Patent Document 2 below, elastic contraction means for forming a contraction action line that approaches the base end side from the free end toward the intermediate position in the vertical direction from both longitudinal ends of the leak preventive side wall in the leak preventive side wall An absorbent article is disclosed.

Japanese Patent No. 4492913 JP 2001-252308 A

  In the absorbent article described in Patent Document 1, by forming a frill on the side of the absorbent article, the product end comes into contact with the base of the leg in a point-like manner, and therefore friction between the skin of the user and the user. Is less likely to occur, and the groin pain and discomfort can be reduced. However, in the case of an absorbent article in which a three-dimensional gather is formed, the free end of the three-dimensional gather is formed in a straight line with respect to the longitudinal direction even if the outline of the side portion has a frill shape. Therefore, there is a concern that a feeling of rubbing may occur due to friction with the skin by contacting the base of the leg, and feeling pain or discomfort.

  On the other hand, the absorbent article described in Patent Document 2 is such that a three-dimensional gather easily follows the shape of the crotch portion by curving an elastic member arranged in the three-dimensional gather. Since it is formed linearly in the longitudinal direction, the free end of the three-dimensional gather is rubbed around the legs, causing pain and rubbing around the legs, which may cause skin troubles. Moreover, since the side part of the absorbent article is linearly formed in the longitudinal direction, it rubs around the legs when worn and causes skin troubles such as pain and discomfort due to friction.

  Accordingly, a main object of the present invention is to provide an absorbent article in which the outlines on both sides of the absorbent article and the free ends of the three-dimensional gathers are rubbed around the legs, and skin troubles due to friction are less likely to occur.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and the longitudinal sides of the skin side are respectively along the longitudinal direction. In the absorbent article in which a three-dimensional gather is formed,
The outer shape of the absorbent article on both sides in the longitudinal direction is formed in a frill shape that is wavy,
The three-dimensional gather has at least one elastic elastic member along the longitudinal direction of the absorbent article, and the separation width between the elastic elastic member and the free end of the three-dimensional gather is in the longitudinal direction of the absorbent article. There is provided an absorbent article characterized in that the free end of the three-dimensional gather is formed in a wave-like frill shape so that a large portion and a small portion are alternately and repeatedly formed .

  In the first aspect of the present invention, since both the outlines on both sides in the longitudinal direction of the absorbent article and the free ends of the three-dimensional gathers, which are easily rubbed around the legs when worn, are each formed into a wavy frill shape, Since it comes into contact with the circumference of the wearer's legs in a point-like manner when worn, the rub feeling caused by friction with the wearer's skin is alleviated, and skin troubles such as pain and discomfort are less likely to occur.

As the present invention according to claim 2, before Symbol resilient and elastic members, the absorbent article according to claim 1, wherein are arranged so as not to overlap the ruffle shape of the three-dimensional gathers are provided.

  In the invention according to claim 2, by disposing the elastic elastic member so as not to overlap the frill shape of the three-dimensional gather, the elastic elastic member is not directly in contact with the skin, and the skin of the three-dimensional gather free end is surely obtained. The hit can be softened.

  As a third aspect of the present invention, the frill shape of the outline and the frill shape of the three-dimensional gather are formed in the same wave shape, or formed in a wave shape having different phases, amplitudes and / or wavelengths. The absorbent article in any one of 1-3 is provided.

  In the invention according to claim 3, since the frill shape of the outline and the frill shape of the three-dimensional gather are formed in the same wave shape, in the case of an outward three-dimensional gather, after bonding the gather sheets By cutting the product outline and the gather sheet simultaneously with the product outline cutter, the frill shape of the product outline and the frill shape of the three-dimensional gather can be provided simultaneously in one cutting process. In addition, when it is formed in a wave shape having different phases, amplitudes and / or wavelengths, there is an advantage that the convex curve of each wavy line works to make up for leakage by contacting the skin as described in detail later. is there.

  As described in detail above, according to the present invention, the external lines on both sides of the absorbent article and the free ends of the three-dimensional gathers are rubbed around the legs, and skin troubles due to friction are less likely to occur.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. (A)-(C) is respectively the IIA-IIA arrow directional view of FIG. 1, the IIB-IIB arrow directional view, and the IIC-IIC arrow directional view. (A) is a development view of the sanitary napkin 1, and (B) is a view taken along the line B-B when the three-dimensional gather BS stands. 1 is a development view of a sanitary napkin 1. FIG. 1 is a development view of a sanitary napkin 1. FIG. (A) of the sanitary napkin 1 is a developed view, and (B) is a BB line arrow view. The sanitary napkin 1 which concerns on another form example is shown, (A) is an expanded view, (B) is the BB line arrow directional view. The sanitary napkin 1 which concerns on another form example is shown, (A) is an expanded view, (B) is the BB line arrow directional view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, or the like, and a permeate that quickly permeates menstrual blood or a cage. A liquid surface sheet 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2, 3, and the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving diffusibility. The crepe paper 5 that surrounds and the side nonwoven fabrics 7 and 7 disposed along the longitudinal direction on both sides of the surface are provided so as to protrude at the surface side in a predetermined section in the front-rear direction so as to include at least a body fluid discharge portion. It is mainly composed of a pair of left and right three-dimensional gathers BS and BS. Around the absorbent body 4, at the front and rear edge portions in the napkin longitudinal direction, the outer edge portion of the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is formed of an adhesive such as hot melt, heat seal, or the like. The liquid-impervious back sheet 2 and the side nonwoven fabric 7 which are joined by an adhesive means and extend laterally from the edge of the absorbent body 4 at both side edges thereof are adhesives such as hot melt or heat. The outer periphery flap part in which the absorber 4 does not exist is formed on the outer periphery by being bonded by an adhesive means such as a seal.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. 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.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. 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. Of these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the liquid-impervious back sheet 2 and the liquid-permeable top sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in the pulp. A high water-absorbing polymer is used. The absorbent body 4 is preferably surrounded by the crepe paper 5 in order to maintain the shape, rapidly diffuse menstrual blood, and prevent reversal of once absorbed menstrual blood, but may be omitted.

  Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and those made of artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. In the case of a thin sanitary napkin, the absorbent body 4 manufactured by the airlaid method is used. Further, as the superabsorbent polymer, superabsorbent polymer granular powder (SAP) or superabsorbent polymer fiber (SAF) can be used.

  On the other hand, side nonwoven fabrics 7 and 7 are provided on both sides of the sanitary napkin 1 on the surface side, respectively, along the longitudinal direction and over almost the entire length of the napkin 1. While these side nonwoven fabrics 7 and 7 are extended to the side, the side flap part is formed with the liquid-impermeable back sheet 2 also extended to the side.

  As the side nonwoven fabric 7, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of an important function. For example, if importance is placed on functions such as preventing the penetration of bodily fluids or enhancing the feeling of touch, it is necessary to use a water-repellent non-woven fabric coated with a silicon-based, paraffin-based, or alkylchromic chloride-based water repellent. desirable. Further, if importance is attached to the absorbability of body fluid in the side nonwoven fabric 7, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, or stannic chloride Treatment with a metal salt, such as by partially dissolving the surface to make it porous and depositing metal hydroxide, etc. It is desirable to use a nonwoven fabric.

  As shown in FIG. 2, the side nonwoven fabric 7 has a portion outside the intermediate portion in the width direction ranging from the inner position of the absorbent body 4 to slightly beyond the absorbent side edge to the outer edge of the liquid-impermeable back sheet 2. It is bonded with an adhesive such as hot melt. On the other hand, the inner side portion of the side nonwoven fabric 7 is folded outward in the width direction, and at least the folded tip is constituted by a double sheet, and appropriate positions in both ends or in the longitudinal direction are fixed inside the double sheet. At least one thread elastic elastic member 8 in the illustrated example is disposed. As shown in FIG. 2 (A), the portion folded back outward in the width direction is bonded to the lower layer side at the front and rear ends in the napkin longitudinal direction. In the intermediate part in the longitudinal direction of the napkin where the other thread-like elastic elastic members 8 are arranged, as shown in FIGS. 2B and 2C, the thread-like elastic elastic members 8 stand up on the surface side due to the contraction action. The three-dimensional gather BS and BS to be formed are formed.

  The contour lines on both sides in the longitudinal direction of the sanitary napkin 1 are at least a central portion in the longitudinal direction, and a portion that comes into contact with the root of the wearer's leg at the time of wearing is alternately arranged with a convex curve and a concave curve. It is formed in a frill shape forming a wavy line. In other words, the sanitary napkin 1 is formed in a frill shape in which a wide portion and a narrow portion are alternately and repeatedly formed along the longitudinal direction. In addition, the free end of the three-dimensional gather BS is at least a central portion in the longitudinal direction, and a portion that comes into contact with the base of the wearer's leg at the time of wearing forms a wavy line by alternately arranging convex curves and concave curves. It is formed in a frill shape. In other words, the standing height from the base end of the three-dimensional gather BS is formed in a frill shape in which high and low portions are alternately and repeatedly formed along the napkin longitudinal direction.

  In this way, by forming the contour lines on both sides of the napkin and the free ends of the three-dimensional gather BS in a frilled shape, the napkin contour lines and the gather free ends come into contact with the circumference of the wearer's legs in a point-like manner when worn. Rub due to friction with the wearer's skin is relieved, and skin troubles such as pain and discomfort can be made difficult to occur.

  In the sanitary napkin 1 shown in FIG. 1, the width constituting the three-dimensional gather BS so that the outlines on both sides in the longitudinal direction of the sanitary napkin 1 substantially coincide with the outline of the free end of the three-dimensional gather BS in the unfolded state. The end of the portion turned back outward in the direction extends to the outer edge of the napkin. This makes it possible to simultaneously cut the napkin outline and the three-dimensional gather BS, as will be described in detail later, and to simplify the manufacturing process.

  Moreover, as shown in FIG. 1, it is desirable that the thread-like elastic elastic members 8 provided in the three-dimensional gather BS are arranged so as not to overlap the frill shape of the three-dimensional gather BS. That is, the thread-like elastic elastic member 8 is disposed on the inner side of the free end while having a predetermined separation width in the napkin width direction between the free end of the three-dimensional gather BS. The separation width S between the elastic elastic member 8 and the free end of the three-dimensional gather BS is preferably about 1.5 mm at the top of the concave curve that is the smallest. If the thread-like elastic elastic member 8 overlaps the frill shape, or if the separation width S is too small, the thread-like elastic elastic member 8 comes into contact with the skin and rubs easily, causing skin troubles.

  In the example shown in FIG. 1, the thread-like elastic elastic members 8 are arranged linearly along the napkin longitudinal direction, but as shown in FIG. 3, they are waved along the frill shape of the three-dimensional gather BS. It is also possible to arrange. When arranged in such a wavy shape, the elastic elastic elastic member 8 contracts and deforms into a linear shape when the three-dimensional gather BS stands up. As a result, the convex curve projecting outward from the wavy line of the three-dimensional gather BS. Since the portion contracts in the longitudinal direction and is deformed so as to be drawn inward in the width direction, the free end side portion from the thread-like elastic elastic member 8 becomes an upright surface of the three-dimensional gather BS as shown in FIG. On the other hand, it deforms as if it is turned over to the outside. For this reason, the contact of the free end of the three-dimensional gather BS becomes more flexible.

  In the example shown in FIG. 1, the napkin outline and the free end of the three-dimensional gather BS are formed in a wavy shape, but as shown in FIGS. 4 and 5, the phase, amplitude, and It is also possible to form them with different wavelengths. In the example shown in FIG. 4, the wavy line of the napkin outline and the wavy line of the free end of the three-dimensional gather BS are substantially the same in amplitude and wavelength, and in a state where the phase is shifted by a half cycle, The lines connecting the vertices of the convex curves are formed so as to be located on substantially the same line. As a result, a convex curve that is convex outside the other wavy line is positioned in the concave curve portion that is convex inside the one wavy line. Accordingly, the concave curve of one wavy line is a portion where the gap between the skin 4 and the skin is likely to occur because the distance from the side edge of the absorber 4 and the standing height of the three-dimensional gather BS are short. Since the convex curve of the other wavy line overlaps with this concave curve, this convex curve acts to make contact with the skin and compensate for leakage.

  In the example shown in FIG. 5, the wavelengths of the two frill-shaped wavy lines (intervals between adjacent convex curves) are made different. Both the wavelength L1 of the napkin outline and the wavelength L2 of the free end of the three-dimensional gather BS are closer to the point because the part that contacts the skin is closer to the point, but the effect of making it wavy if it is too fine Will be lost. Therefore, the wavelengths L1 and L2 are 5 to 30 mm, preferably 15 to 25 mm, respectively.

  Although not shown, they may be formed so that the amplitudes of both wavy lines are different. For example, the napkin outline is in contact with the base of the leg and is more likely to receive a leg pressure than the three-dimensional gather BS, so that it can be made larger than the frill-shaped amplitude of the three-dimensional gather BS to make the wavy convex curve difficult to collapse.

  Further, as shown in FIG. 6, at least one thread-like elastic elastic member 9 which is a flap portion on both sides of the napkin body and between the liquid-impermeable back sheet 2 and the side nonwoven fabric 7 along the longitudinal direction of the napkin. By gathering, gathers may be formed on both sides of the napkin body. As a result, double gathers in which gathers are further provided outside the solid gather BS are formed on both sides of the napkin surface side, and the degree of adhesion to the base of the legs can be increased. .

  In the three-dimensional gather BS, the double nonwoven fabrics 7 and 7 on the free end side from the thread-like elastic elastic member 8 may be flickered as non-bonded. As a result, the skin contact at the gather tip can be further softened, and the feeling of rubbing can be further reduced.

  In manufacturing the sanitary napkin 1, when the frill shape of the napkin and the frill shape of the three-dimensional gather BS are matched, the side nonwoven fabric 7 is appropriately folded, and the liquid-permeable surface sheet 3 and the side nonwoven fabric 7 are bonded together. Then, it is bonded to the surface side of the absorber 4. Then, in a state where these laminates are bonded to the upper surface of the liquid-impervious back sheet 2, the liquid-impervious back sheet 2 is cut together with the folded end portion of the side nonwoven fabric 7 with a product cutter, thereby forming a napkin outline. And the ruffle shape of the free end of the three-dimensional gather BS can be formed at the same time.

  On the other hand, as shown in FIG. 4, when the phase of the wavy line is shifted and at least a part of the free end of the three-dimensional gather BS is located outside the napkin outline, It is necessary to cut the shape and the frill shape of the three-dimensional gather BS separately. In this case, both side edges of the liquid-impermeable back sheet 2 are cut into a frill shape, and then the side edges corresponding to the napkin outline are cut into the same frill shape as the liquid-impervious back sheet 2 and the three-dimensional gather BS A side nonwoven fabric cut into a predetermined frill shape at the side edge corresponding to the free end of the sheet is laminated and bonded while being aligned with the wavy line of the liquid-impervious backsheet 2, and then the front and rear ends of the napkin are cut. Can be manufactured.

  Further, in the case where the wavelengths of the two frill shapes shown in FIG. 5 are made different or the amplitude is made different, the above-mentioned non-existence is applied to the case where the free end of the three-dimensional gather BS protrudes outside the frill shape of the napkin outline. The liquid-permeable back sheet 2 and the side nonwoven fabric 7 can be manufactured by laminating and bonding them together while aligning the cut pieces of wavy lines. On the other hand, in the case where the free end of the three-dimensional gather BS is located inside the frill shape of the napkin outline, only the side edge corresponding to the free end of the three-dimensional gather BS of the side nonwoven fabric 7 is cut into a frill shape, and then impervious. It can be manufactured by cutting both the liquid-impervious back sheet 2 and the side nonwoven fabric 7 into a napkin outline with a product cutter in a state of being laminated and adhered to the liquid back sheet 2.

  By the way, when the outlines on both sides of the napkin and the free ends of the three-dimensional gather BS are formed in the same frill shape, it is desirable to arrange them so that both frill shapes coincide as shown in FIG. And the free end of the three-dimensional gather BS may be arranged so as to be displaced in the width direction.

[Other examples]
(1) In the above embodiment, the case where the three-dimensional gather BS is an outward gather with the free end facing outward as shown in FIG. 2 has been described. However, as shown in FIGS. The same applies to an inward gather with the end facing inward.
(2) In the above embodiment, the three-dimensional gather BS is formed by the inner part of the side nonwoven fabric 7 extending to the side edge of the sanitary napkin 1, but the three-dimensional gather nonwoven fabric different from the side nonwoven fabric 7 is used. A three-dimensional gather BS may be formed and joined to both side portions on the surface side of the sanitary napkin 1.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 7 ... Side nonwoven fabric, 8 * 9 ... String-like elastic elastic member

Claims (3)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable top sheet and the back sheet, and three-dimensional gathers are formed along the longitudinal direction on both sides in the longitudinal direction on the skin side,
The outer shape of the absorbent article on both sides in the longitudinal direction is formed in a frill shape that is wavy,
The three-dimensional gather has at least one elastic elastic member along the longitudinal direction of the absorbent article, and the separation width between the elastic elastic member and the free end of the three-dimensional gather is in the longitudinal direction of the absorbent article. An absorbent article , wherein a free end of the three-dimensional gather is formed in a wavy shape so that a large portion and a small portion are alternately and repeatedly formed .   The absorbent article according to claim 1, wherein the elastic elastic member is disposed so as not to overlap the frill shape of the three-dimensional gather.   The absorption according to claim 1, wherein the frill shape of the outline and the frill shape of the three-dimensional gather are formed in the same wave shape, or in the wave shape having different phases, amplitudes, and / or wavelengths. Sex goods.

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