JP5479220B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent main body including an absorber disposed between the top sheet and the back sheet, and a cover sheet covering the surface of the top sheet, with a weak line, There is a known absorbent article in which a pair of flaps for fixing the absorbent body to the garment are defined, and the pair of flaps are folded and spread when used to be fixed to the garment (see Patent Document 1). In the embodiment shown in FIGS. 1 to 4 of Patent Document 1, a pair of flaps that are expanded in the left-right direction are provided, and in the embodiment shown in FIG. 5, a pair of flaps that are extended in the front-rear direction are provided.

Japanese National Patent Publication No. 9-512454

  However, it is practically difficult to fix the absorbent body to clothing with only a pair of flaps. As a result, the absorption main body is twisted or displaced, and the liquid to be absorbed such as menstrual blood or urine may leak.

  In order to solve the above-mentioned problems, according to the present invention, an absorption body comprising an absorption body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet. The protective article comprises a cover sheet that covers the surface of the top sheet, the peripheral area of the cover sheet is joined to the absorbent main body, and in the central area of the cover sheet, a dividing line consisting of a weakening line or a cutting line, An absorbent article is provided in which at least three flaps for securing the absorbent body to the garment are defined and, in use, the flaps are each folded and unfolded in the folding region and secured to the garment.

  The absorbent body can be securely fixed to the clothing.

It is a front view of a sanitary napkin. It is a rear view of a sanitary napkin. FIG. 3 is a schematic transverse cross-sectional view of the sanitary napkin taken along line III-III in FIG. 1. It is a front view of the sanitary napkin which expand | deployed the flap. It is a schematic longitudinal cross-sectional view of the sanitary napkin for demonstrating a use condition. It is a schematic cross section of the sanitary napkin for demonstrating a use condition. It is a front view of the sanitary napkin which shows another Example by this invention. It is the (A) front view of the sanitary napkin which shows another Example by this invention, and (B) general | schematic horizontal sectional drawing. It is a front view of the sanitary napkin which shows the example of a change of a lane marking. It is a front view of the sanitary napkin which shows the example of a change of a cover sheet.

  1 to 3 show a case where the present invention is applied to a sanitary napkin. However, the present invention can also be applied to other absorbent articles such as panty liners and incontinence pads.

  1 to 3, a sanitary napkin (hereinafter also simply referred to as “napkin”) 1 according to an embodiment of the present invention includes an absorbent body 2. The absorbent main body 2 includes a liquid-permeable top sheet 3, a liquid-impermeable back sheet 4, and a liquid-retaining absorbent 5 disposed between the top sheet 3 and the back sheet 4. . The top sheet 3 and the back sheet 4 have substantially the same size, and are joined to each other at the peripheral edge by hot melt adhesive, heat sealing, or the like. In addition, an adhesive portion 6 for fixing the absorbent body 2 to the underwear is joined to the surface of the back sheet 4 that is directed to clothing such as underwear during use, and the adhesive portion 6 is covered with a protective sheet 7.

  In FIG. 1, 2F, 2B, 2L, and 2R indicate the front edge, the rear edge, the left edge, and the right edge of the napkin 1 or the absorbent body 2, respectively. The front, rear, left and right in this case correspond to the front, back, left and right of the user's body in use.

  The surface of the top sheet 3 that comes into contact with the user's skin during use is covered with a liquid-impermeable cover sheet 8. The cover sheet 8 is approximately the same size as the absorbent main body 2, and thus covers almost the entire surface of the top sheet 3. Further, the cover sheet 8 is joined to the top sheet 3 or the absorbent main body 2 by a hot melt adhesive, heat seal processing or the like in the annular peripheral region 8P. On the other hand, the central region 8C, which is a region other than the peripheral region 8P, is not joined to the top sheet 3.

  In the central region 8C of the cover sheet 8, a dividing line 9 made of a weak line such as a perforation is formed in advance, and a plurality of lines for fixing the absorbent body 2 to the underwear by the dividing line 9 in the central region 8C. The flap is partitioned or formed. In addition, the dividing line 9 can also be comprised from the cutting line which cut | disconnects the cover sheet 8 completely.

  In the embodiment according to the present invention, the dividing line 9 includes a U-shaped curved portion 9F that expands toward the front end edge 2F, a U-shaped curved portion 9B that expands toward the rear end edge 2B, and substantially the cover sheet 8. It is composed of a straight line portion 9S that connects the vertices of these curved portions 9F and 9B at the center. Therefore, four flaps, that is, a semi-oval front flap 10F and a rear flap 10B having a curved tip, and a trapezoidal left flap 10L and a right flap 10R are defined in the central region 8C. In this case, the front and rear flaps 10F and 10B are positioned symmetrically with each other, and the left and right flaps 10L and 10R are also positioned symmetrically with each other.

  In this case, the partition line 9 does not reach the peripheral region 8P, and therefore, an uncut region 8N is formed between the end of the partition line 9 and the peripheral region 8P.

  Adhesive portions 11 for fixing the corresponding flaps 10F, 10B, 10L, and 10R to the underwear are joined to the surfaces of the flaps 10F, 10B, 10L, and 10R, respectively. Further, these adhesive portions 11 are covered with a common protective sheet 12. In this case, the adhesive portion 11 is separated from the partition line 9 and joined to the flaps 10F, 10B, 10L, and 10R. Therefore, the non-adhesive region 13 is formed in the flaps 10F, 10B, 10L, and 10R around the adhesive portion 11. .

  Next, the material of each element will be described.

  The top sheet 3 is composed of, for example, a perforated or non-porous nonwoven fabric or a porous plastic sheet.

  The back sheet 4 is composed of, for example, a hydrophobic nonwoven fabric, a water-impermeable plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, a highly water-resistant melt-blown nonwoven fabric, and an SMS nonwoven fabric sandwiched between strong spunbond nonwoven fabrics. The

  The absorbent body 5 is composed of, for example, a fluffy pulp or airlaid nonwoven fabric and a superabsorbent polymer. Here, the fluffy pulp is composed of, for example, artificial cellulose fibers such as chemical pulp, cellulose fiber, rayon, and acetate, and the airlaid nonwoven fabric is composed of, for example, a nonwoven fabric in which pulp and synthetic fiber are thermally fused or fixed with a binder. The superabsorbent polymer is composed of, for example, a starch-based, acrylic acid-based, or amino acid-based particulate or fibrous polymer.

  The adhesive portions 6 and 11 are hot melts such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-ethylene copolymer (SEBS), etc. Consists of an adhesive.

The cover sheet 8 is composed of, for example, a hydrophobic nonwoven fabric, a water-impermeable plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, a highly water-resistant meltblown nonwoven fabric, and an SMS nonwoven fabric sandwiched between strong spunbond nonwoven fabrics. Preferably, it is composed of a hydrophobic nonwoven fabric. The basis weight of the cover sheet 8 is preferably 15 g / m ² to 60 g / m ² . When composed of a plastic film, the draping property of the plastic film is preferably 20 mm to 100 mm, more preferably 30 mm to 70 mm by the cantilever method. This is because if the drapeability is smaller than 20 mm, the cover sheet 8 is easily twisted. On the other hand, if the drapeability is larger than 100 mm, the cover sheet 8 becomes hard, so there is a possibility that the feeling of use of the napkin 1 may be deteriorated, and the followability to the underwear may be lowered and the liquid to be absorbed may leak. is there.

  In addition, the above-mentioned cantilever method is performed as follows according to JIS-L1018. That is, a measurement sample is obtained by stacking five measurement objects having a length of 150 mm and a width of 25 mm. Next, using a cantilever manufactured by Daiei Scientific Instruments Co., Ltd., the measurement sample is sandwiched under the holding plate of the cantilever and slid in the slope direction to automatically measure the moving distance at a speed of 5 mm / sec. Measurement is performed both when the surface of the measurement sample is down and when the back surface of the measurement sample is down, and the average of these is taken as the measurement result.

  Now, the napkin 1 is fixed to the underwear as follows. That is, first, the protective sheet 7 on the back sheet 4 side is removed, and the napkin 1 or the absorbent body 2 is fixed to the underwear via the adhesive portion 6. At this time, since the top sheet 3 is covered with the cover sheet 8, the top sheet 3 is prevented from being contaminated.

  Next, the central region 8 </ b> C of the cover sheet 8 is broken along the partition line 9. As a result, four flaps 10F, 10B, 10L, and 10R separated from each other are formed.

  Next, as shown in FIG. 4, these flaps 10F, 10B, 10L, and 10R are expanded. That is, the front flap 10F is folded in the folding region 14F along the front edge 2F and expanded in the forward direction, and the rear flap 10B is folded in the folding region 14B along the rear edge 2B and expanded in the rear direction. Further, the left flap 10L is folded in the folding region 14L along the left edge 2L and expanded leftward, and the right flap 10R is folded in the folding region 14R along the right edge 2R and expanded rightward. As a result, the top sheet 3 is exposed.

  Next, the flaps 10F, 10B, 10L, and 10R are fixed to the underwear through the respective adhesive portions 11. That is, as shown in FIG. 5 showing a longitudinal section of the napkin 1, the front flap 10F is fixed to the inner surface UI of the underwear U in front of the absorbent body 2, and the rear flap 10B is attached to the inner surface UI of the underwear U in the rear of the absorbent body 2. It is fixed. Moreover, as shown in FIG. 6 which shows the cross section of the napkin 1, the left flap 10L and the right flap 10R are fixed to the outer surface UO of the underwear U below the absorbent body 2, respectively.

  In this way, the flaps 10F, 10B, 10L, 10R are fixed to the underwear U, and thus the absorbent main body 2 is fixed to the underwear U. In this case, the front-rear flaps that are spread and fixed in the front-rear direction like the front flap 10F and the rear flap 10B, and the left-right flaps that are spread in the left-right direction and fixed like the left flap 10L and the right flap 10R. The absorption main body 2 is fixed to the underwear U by both. Further, the inner surface fixing flaps fixed to the underwear inner surface UI, such as the front flap 10F and the rear flap 10B, are held by being sandwiched between the underwear U and the user's body. On the other hand, outer surface fixing flaps fixed to the outer surface UO of the underwear U, such as the left flap 10L and the right flap 10R, sandwich the underwear U between the absorbent main body 2.

  Therefore, even if external forces in various directions act on the absorbent main body 2, it is possible to suppress the twist and displacement of the absorbent main body 2. That is, the absorption main body 2 can be reliably fixed to the underwear U, and therefore leakage of the liquid to be absorbed can be suppressed. Moreover, the user's anxiety about leakage can be eliminated.

  In the embodiment according to the present invention, the tips of the inner surface fixing flaps such as the front flap 10F and the rear flap 10B are curved, so that the pain and discomfort when the front flap 10F and the rear flap 10B come into contact with the user's body are suppressed. Is done.

  Further, since the non-adhesive region 13 is formed at the tip of the flaps 10F, 10B, 10L, and 10R, the user handles the flaps 10F, 10B, 10L, and 10R by gripping the non-adhesive region 13. Therefore, the absorbent body 2 can be easily fixed to the underwear U.

  Here, as can be seen from FIG. 4, the bent regions 14F, 14B, 14L, and 14R are generally located on a straight line connecting two adjacent ends of the partition line 9. On the other hand, as shown in FIG. 1, a non-cutting region 8N is formed between the end of the partition line 9 and the peripheral region 8P. Therefore, as shown in FIGS. 5 and 6, the entire circumference of the cover sheet 8 is formed on the cover sheet 8 between the peripheral area 8P and the bent areas 14F, 14B, 14L, 14R or the flaps 10F, 10B, 10L, 10R. Thus, the leak-proof region 15 that continuously extends is formed. The leak-proof region 15 regulates the flow of the liquid to be absorbed toward the outside of the absorbent main body 2 along the surface of the top sheet 3 and thus acts as a leak-proof wall.

  In the embodiment according to the present invention, the leak-proof region 15 that acts as a leak-proof wall is formed simply by joining one cover sheet 8 to the absorbent body 2. Therefore, it is possible to easily obtain the leakage preventing action. Further, the leak-proof area 15 is seamless. In addition, when the flaps 10F, 10B, 10L, and 10R are pulled to adhere to the underwear U, the inner edge of the leak-proof region 15 rises from the top sheet 3, so that the liquid to be absorbed is reliably captured by the leak-proof region 15. . Therefore, leakage of the liquid to be absorbed can be reliably suppressed.

  Note that the width of the peripheral region 8P is preferably 2 mm to 10 mm, and more preferably 3 mm to 5 mm. This is because if the width of the peripheral region 8P is narrower than 2 mm, the bonding strength between the cover sheet 8 and the absorbent body 2 decreases. Further, if the width of the peripheral region 8P is wider than 10 mm, the surface of the top sheet 3 exposed when the flaps 10F, 10B, 10L, and 10R are expanded becomes narrow. That is, when the top sheet is widely exposed, leakage of the liquid to be absorbed can be suppressed even if the fixing position of the napkin 1 or the absorbent body 2 with respect to the undergarment U is slightly deviated from the appropriate position.

  On the other hand, the width of the non-cutting region 8N is preferably 2 mm to 10 mm, and more preferably 3 mm to 5 mm. This is because if the width of the non-cutting region 8N is narrower than 2 mm, the tensile strength of the cover sheet 8 in the non-cutting region 8N is lowered, and the leakproof effect of the leakproof region 15 is lowered. Further, if the width of the non-cutting region 8N is wider than 10 mm, the surface of the top sheet 3 exposed when the flaps 10F, 10B, 10L, and 10R are expanded becomes narrow.

  Next, another embodiment according to the present invention will be described.

  In another embodiment according to the present invention, the rigidity of the area around the adhesive portion 11 among the flaps 10F, 10B, 10L, and 10R is set higher than the rigidity of the other areas.

  That is, in the example shown in FIG. 7, an embossed region 20 that is embossed around the adhesive portion 11 is provided. On the other hand, the remaining area 21 is not embossed. On the other hand, in the example shown in FIGS. 8A and 8B, the additional sheet 22 is joined around the adhesive portion 11. On the other hand, the additional sheet 22 is not joined to the remaining area 21.

  If it does in this way, handling of flap 10F, 10B, 10L, 10R becomes easy, and flap 10F, 10B, 10L, 10R can be easily stuck to underwear U.

  Here, the ratio of the embossed region 20 or the additional sheet 22 to the entire flaps 10F, 10B, 10L, and 10R is preferably 20% or more, and particularly preferably 40% to 100%.

  In the example shown in FIG. 7, if the embossed region 20 is an uneven pattern, the contact area between the flaps 10 </ b> F and 10 </ b> B and the user's body can be reduced, so that stuffiness is prevented and the wearing feeling is improved. Moreover, it is excellent in the transfer property of the hot melt adhesive when the adhesive part 11 is joined to the flaps 10F, 10B, 10L, 10R.

  Further, in the example shown in FIGS. 8A and 8B, the additional sheet 22 may be the same material as the cover sheet 8 or another material. Further, the additional sheet 22 may be bonded to the back surface of the cover sheet 8. A hot melt adhesive or the like is used for joining the additional sheet 22. The dividing line 9 is formed after the additional sheet 22 is joined to the cover sheet 8, and thus also formed on the additional sheet 22.

  In addition, in the example shown by FIG.7 and FIG.8 (A), 8 (B), the adhesion part 11 is each covered with the separate protective sheet 12. FIG. Of course, the common protective sheet 12 can also be provided.

  By the way, from another viewpoint, in the example shown in FIGS. 7 and 8A and 8B, the rigidity of the remaining region 21 including the bent regions 14F, 14B, 14L, and 14R is the embossed region 20 or additional. That is, it is set lower than the rigidity of the region where the sheet 22 is joined. As a result, the flaps 10F, 10B, 10L, and 10R can be easily folded and expanded.

  In the description so far, the partition line 9 is formed so that four flaps are partitioned in the central region 8 </ b> C of the cover sheet 8. However, the number of flaps need not be four. That is, as shown in FIG. 9A, the dividing line 9 may be formed so that the three flaps 10F, 10L, and 10R are divided in the central region 8C, or as shown in FIG. 9B. In addition, the partition line 9 may be formed so that six flaps 10F, 10B, 10LF, 10LB, 10RF, and 10RB are partitioned in the central region 8C.

  Therefore, comprehensively speaking, at least three flaps are partitioned by the partition line 9 in the central region 8C of the cover sheet 8.

  Further, in the above description, the cover sheet 8 is composed of one sheet. However, the cover sheet 8 can also be composed of a plurality of cover sheet portions separated from each other. That is, in the example shown in FIG. 10, the cover sheet 8 is composed of, for example, four cover sheet portions 30. In this case, these cover sheet portions 30 partially cover the surface of the top sheet 3 respectively, but generally cover the surface of the top sheet 3 as a whole. Moreover, the partition line 9 formed between the cover sheet portions 30 adjacent to each other extends across the peripheral region 8P. Further, in the example shown in FIG. 10, the cover sheet portion 30 forms the flaps 10F, 10B, 10L, and 10R, respectively. A plurality of flaps 10F, 10B, 10L, and 10R may be formed by one cover sheet portion 30. Further, the cover sheet portions 30 may overlap each other.

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Absorption body 3 Top sheet 4 Back sheet 5 Absorber 8 Cover sheet 8C Central area 8P Peripheral area 9 Dividing line 10F Front flap 10B Rear flap 10L Left flap 10R Right flap 11 Adhesive part 13 Non-adhesive area 14F, 14B , 14L, 14R Bending area 15 Leak-proof area 20 Embossed area 21 Remaining area 22 Additional sheet

Claims (7)

In an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent main body including an absorbent body disposed between the top sheet and the back sheet , substantially the entire surface of the top sheet is covered. A cover sheet is provided, and the peripheral area of the cover sheet is joined to the absorbent main body, and the absorbent main body is fixed to the garment in the central area of the cover sheet by a dividing line consisting of a weakening line or a cutting line. At least three flaps are defined, and in use, each of the flaps is folded and spread in a folding region and secured to a garment, and the at least three flaps are folded in a folding region along the front and rear edges of the absorbent body. At least one of the front flap and the rear flap A flap formed in a semi-oval shape with a curved tip, and a left flap and a right flap that are folded in the folding region along the left and right side edges of the absorbent body and expanded in the left-right direction, and formed in a trapezoidal shape An absorbent article comprising a left flap and a right flap . The at least three flaps are respectively folded in a folding region along the front and rear end edges of the absorbent body and expanded in the front-rear direction, and folded in a lateral region along the left and right side edges of the absorbent body in the lateral direction. The absorbent article of Claim 1 containing the left flap and right flap which are expanded. The at least three flaps each include an inner surface fixing flap that is bent and fixed to an inner surface of the garment in the folding region, and an outer surface fixing flap that is bent and fixed to the outer surface of the garment in the bending region, respectively. The absorbent article according to 1 or 2. The absorbent article according to claim 3 , wherein a flap formed in a semi-oval shape having a curved tip is used as the inner surface fixing flap . Wherein and fixing portion to fix at least three flaps to the garment is respectively attached to the flap, is set higher than the rigidity of the rest of the flap region of the flap region around these fixing portions, claim 1 The absorbent article as described in any one of 4 to 4. The absorptive article according to any one of claims 1 to 5 in which the adhering part for adhering said at least 3 flaps to clothing is attached to the flap apart from the division line.   The absorptive article according to any one of claims 1 to 6 in which said cover sheet is liquid impermeable.

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