JP4727347B2 - Sanitary napkin packaging - Google Patents

Description

  The present invention relates to a sanitary napkin package that is stored in an individual bag in a state in which the sanitary napkin is folded.

Conventionally, a sanitary napkin package in which a sanitary napkin is folded and stored in an individual bag is well known. For example, Japanese Patent Laid-Open No. 10-14974 (Patent Document 1) discloses a package of this type, in which the individual bag is cut off at a portion near the end of the sanitary napkin so that the individual bag can be cut open. It is easily formed. The sanitary napkin in the individual bag is folded with the liquid-permeable surface sheet on the inside so that the length thereof is about one third. Japanese Unexamined Patent Publication No. 2001-37804 (Patent Document 2) discloses a single bag structure of a sanitary napkin. In this sanitary napkin, a leak-proof groove extending in the width direction is formed in the absorbent layer, and at least one bent portion of the sanitary napkin and its packaging material is formed so as to overlap the leak-proof groove. .
Japanese Patent Laid-Open No. 10-14974 JP 2001-37804 A

  In the sanitary napkin package described in Patent Document 1, it is easy to take out the sanitary napkin from the individual bag, but when the sanitary napkin is folded, it is folded up to that time. A wrinkle that is a crease is attached to a portion that has been bent, and the portion has changed to a portion that is more flexible and easier to bend than a portion that has not been bent. When such a sanitary napkin is applied to the skin, the sanitary napkin bends back and forth with the wrinkle as a boundary, and the vicinity of the wrinkle is difficult to adhere to the skin, creating a gap between the skin and the menstrual blood from the gap Tends to leak. This tendency becomes more prominent as the thickness of the liquid-absorbing core material in the sanitary napkin increases.

  Further, the sanitary napkin described in Patent Document 2 allows easy folding of the sanitary napkin by passing through the leak-proof groove, and even with a thick napkin, the surface is not roughened and feels good. The crease is not noticeable. However, such a tendency is limited to a portion that passes through the leak-proof groove among the bent portions, and as the bent portion moves away from the leak-proof groove, the crease appears prominently. It is thought that the same tendency as the sanitary napkin according to 1 is exhibited.

  Therefore, when taking out and wearing the sanitary napkin that is folded and stored in the individual bag, the present invention ensures that the sanitary napkin adheres well to the skin even in the vicinity of the folding line used when the sanitary napkin is folded. The problem is to improve the prior art.

  In order to solve the above-described problems, the present invention is directed to a liquid-absorbing core material interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, in front of the wearer's crotch. A front end portion to be positioned; a rear end portion positioned behind the wearer's crotch; a length direction extending in a direction connecting the front end portion and the rear end portion; and a width direction orthogonal to the length direction; A sanitary napkin in which a thick portion having a thickness of at least 5 mm is formed at the center in the width direction including the core material, and extends in the width direction with the topsheet as an inside. It is a sanitary napkin package that is folded in a plurality of parallel folding lines and stored in an individual bag.

In this sanitary napkin package, the present invention is characterized as follows. In the sanitary napkin, the thick portion is formed within a range of two thirds of the total length of the sanitary napkin in the length direction and close to the front end, and the thickness in the length direction is the thickness. Near the rear end connected to the thick part , a thin part having a thickness not exceeding 4 mm is formed, and the thin part is formed on the front end along a folding line extending in the width direction. towards being bent, in a state where the extension of the sanitary napkin wherein the length from the rear end portion measured in the thin wall said folding lines formed in the portion with the distance before and after 20mm The bending stiffness in the direction toward the front end is 1 N or less, and the difference in bending stiffness between the folding line and the distance of 20 mm in the front and rear is 0.6 N or less.

In one embodiment of the invention, the thin wall portion that is bent at the bent lines formed on the thin site overlaps the thick site.
In one embodiment of the present invention, the thin portion that is bent and overlapped with each other in the folding line formed in the thin portion overlaps the thick portion, and the front end portion is the top sheet. The sanitary napkin is folded in four by overlapping the thin portions that overlap each other.

In the sanitary napkin package according to the present invention, even if a thick portion is formed on the sanitary napkin that is folded and stored in the individual bag , the sanitary napkin package has a thickness near the rear end portion that leads to the thick portion. Is formed along a folding line at the thin part, and the bending rigidity measured at the folding line and a distance of 20 mm before and after the folding line is 1 N or less. The sanitary napkin taken out from the package is closer to the rear end when it is applied to the skin because the difference in bending stiffness between the folding line and the distance of 20 mm before and after the folding line is 0.6 N or less. The whole thin part is uniformly curved and adheres well to the skin.

When the folded sanitary napkin is bent at a thin portion, the thin portion adheres well to the wearer's skin when the sanitary napkin is worn, even if wrinkles are generated there. Further, in this aspect of the invention in which the bent thin portion overlaps the thick portion, the thin portion is bent while drawing a gentle curve in the vicinity of the folding curve, so the sanitary napkin Wrinkles along the bent portion are less likely to occur.

  The details of the sanitary napkin package according to the present invention will be described below with reference to the accompanying drawings.

  1 and 2 are a perspective view of the sanitary napkin package 1 and a cross-sectional view taken along line II-II in FIG. The packaging body 1 has a packaging sheet 2 closed in a bag shape and a sanitary napkin 3 covered with the packaging sheet 2. The packaging sheet 2 is formed of a plastic film, a nonwoven fabric made of synthetic fiber, or the like, and the overlapping portions 4 at the side edges of the packaging body 1 are welded to each other. The packaging sheet 2 also has an opening 6 for taking out the sanitary napkin 3, and the opening 6 is primarily closed by an adhesive tape 7. When the adhesive tape 7 is peeled and the end 2a of the packaging sheet 2 at the opening 6 is pulled in the direction of arrow A, the welded portion 4 of the packaging sheet 2 is peeled off and the opening 6 is opened, and the sanitary napkin 3 is removed. It can be taken out. Inside the package 1, the sanitary napkin 3 is folded in three and folded. The sanitary napkin 3 folded in this way has a first bent part 11 and a second bent part 12.

  3, 4, and 5, FIG. 3 is a plan view of the sanitary napkin 3 taken out from the package 1 and extended, and FIG. 4 is a sectional view taken along line IV-IV corresponding to the line MM in FIG. 3. FIG. 5 is a view showing the VV line cut surface of FIG. 3, and the illustration of the packaging sheet 2 is omitted in these drawings. The sanitary napkin 3 has a front end portion 3a positioned in front of the wearer's crotch portion, a rear end portion 3b positioned in the rear portion of the crotch portion, and an intermediate portion 3c between the both end portions 3a and 3b. A length direction extending in a direction connecting 3a and the rear end portion 3b is indicated by a double-headed arrow P, and a width direction orthogonal to the length direction P is indicated by a double-headed arrow Q. The sanitary napkin 3 also has a liquid-permeable top sheet 13, a liquid-impervious back sheet 14, and a liquid-absorbing core material 16 interposed between the two sheets 13 and 14. The top sheet 13 and the back sheet 14 extend from the periphery of the core member 16 and overlap each other, and are joined to each other by welding or adhesion, and the side flap 17 and the end are respectively attached to both sides and both ends of the sanitary napkin 3. Each of the flaps 18 is formed. Each of the side flaps 17 is formed with a leakage barrier 21. The breakwater 21 is formed by a liquid-impervious belt-like sheet extending in the length direction P. As shown in FIG. 5, the outer edge 22 is joined to the side flap 17 by welding or adhesion, The inner edge 23 is located above the core member 16 and the top sheet 13 and is not joined to the top sheet 13, and a pocket 26 is formed between the top edge sheet 13 and the top sheet 13. An elastic member 27 extending in the length direction P is attached to the inner edge 23 in an extended state. When the sanitary napkin 3 is bent in the length direction P, the elastic member 27 contracts and the inner edge The portion 23 can be erected so as to be separated from the top sheet 13, and the pocket 26 can be opened largely. In the preferred sanitary napkin 3, the side flaps 17 are formed as shown in FIG. 5, and the liquid-impervious back sheet 14 and the outer edge 22 of the liquid-impervious leak-proof wall 21 are the liquid-permeable surface. They overlap on the outside of the sheet 13 and are joined together by welding or adhesion. The top sheet 13 of the sanitary napkin 3 is formed of a nonwoven fabric, an apertured plastic film, or the like, and the back sheet 14 is formed of a nonwoven fabric, a plastic film, a composite sheet obtained by laminating a nonwoven fabric and a plastic film, or the like. The core material 16 is formed of a water-absorbing material such as pulverized pulp or a water-absorbing polymer, and the water-absorbing material is wrapped by a sheet 16a such as tissue paper or nonwoven fabric having excellent liquid diffusibility and liquid permeability. An adhesive 14 a for fastening the sanitary napkin 3 to the shorts is applied to the lower surface of the back sheet 14. The inner surface of the packaging sheet 2 is detachably secured to the adhesive 14a (see FIG. 2).

  3, 4, and 5, a compressed groove 31 having a width of 1 to 7 mm is formed on the inner surface of the sanitary napkin 3. The groove 31 is formed by compressing the sanitary napkin 3 from the top sheet 13 toward the back sheet 14 by compressing the core 16 from above the top sheet 13, preferably under heating. Further, as shown in FIG. 3, the preferred groove 31 has deep bottom portions 32 and shallow bottom portions 33 formed alternately in the length direction of the groove 31. In the deep portion 32, the core material 16 is squeezed so as to have a higher density than the core material 16 in the shallow portion 33 adjacent to the deep portion 32. Further, both the parts 32 and 33 extend in a direction intersecting the length direction of the groove 31 and are connected to both side walls of the groove 31. The groove 31 is located closer to the front end 3a of the sanitary napkin 3 and on the inside of the first front protrusion 36 and the front protrusion 36 that form a curve protruding upward in the length direction P in the drawing. While having the formed 2nd front protrusion part 37, the 1st back protrusion part 38 and the 1st back protrusion part which draw the curve which protruded toward the downward direction of the length direction P near the rear-end part 3b And a second rear protrusion 39 formed on the inner side than 38. Each of the projecting portions 36 to 39 includes a pair of straight portions 41 extending in the length direction P in the groove 31 on both sides of the center line MM that bisects the width of the sanitary napkin 3. Connected through. The first front projecting portion 36, the first rear projecting portion 38, and the straight portion 41 form an outer annular portion 42 that is substantially oval and symmetrical with respect to the center line MM. The shaped portion 37, the second rearward protruding portion 39, and the straight portion 41 form an inner annular portion 43 that is substantially oval and symmetrical about the center line MM.

The inner portion 45 of the inner annular portion 43 is a portion that is brought into contact with the periphery of the wearer's vagina, and the outer portion of the inner annular portion 43 is selectively adhered closely to the periphery of the vagina. It is formed thicker than the outer portion 46 by increasing the basis weight of materials such as pulverized pulp and water-absorbing polymer used for the core material 6 rather than 46, and the central part in the width direction Q of the sanitary napkin 3 is the wearer It protrudes from the outer part 46 toward the skin (see FIG. 5). Such an inner part 45 is a part that can be called a thick part or a medium-high part in the sanitary napkin 3. The inner part 45, in other words the thick site 45, line S ₁ of the rear end portion closer to trisects the overall length L of the sanitary napkin 3 and the front end side of the line S ₂ of the _(see FIG. 3) It is formed in front of the range than the line S _1. The preferred thick portion 45 is formed so that the core material 6 has a basis weight of 300 to 700 g / m ² and has a thickness of at least 5 mm, more preferably at least 6.5 mm. The outer portion 46 of the inner annular portion 43 is a portion where the basis weight of the core material 6 is smaller than that of the thick portion 45, and among the portions 46, it is closer to the rear end 3 b in the length direction P, A portion connected to the thick portion 45 is a thin portion 51 in which the basis weight of the core material 6 is adjusted so that the thickness does not exceed 4 mm. The core material 6 of the preferable thin part 51 has a basis weight in the range of 100 to 250 g / m ² .

3 and 4 is a center line that bisects the total length L of the sanitary napkin 3, and lines S ₁ and S ₂ are lines that bisect the total length L. B ₁ and B ₂ are lines indicating the positions of the bent portions 11 and 12 when the sanitary napkin 3 is folded into three as shown in FIG. The sanitary napkin 3 of these figures taken out from the package 1 has a bending stiffness measured by the method described below in a range of 20 mm before and after the folding line B ₁ and the folding line B ₁ in the thin part 51 of 2N or less More preferably, it is 1.5N or less, More preferably, it is 1N or less. The difference in rigidity is 1.2 N or less, more preferably 1 N or less. When folded at folding lines B ₁ when the sanitary napkin 3 is folded, the thin-walled portion 51, as shown in FIGS. 3 and 4, there is the fact that wrinkles 55 are crease occurs. However, the vicinity of the bending lines B ₁ less rigid, the rigidity difference is small, when wearing the sanitary napkin 3 is bending lines B ₁ and its vicinity are uniformly curved sanitary napkin 3 that is worn It adheres well to the skin of the wearer without applying strong force from the outside. In the sanitary napkin 3 closely adhered in this manner, the wrinkles 55 are almost disappeared or become extremely shallow, so that the body fluid flows along the folding line B ₁ and leaks from the side of the sanitary napkin 3. There is no such thing. Further, when the sanitary napkin 3 is folded into three as shown in FIG. 2, if the thin portion 51 is overlapped with the thick portion 45, the thicker portion 45 is thicker. 2, the vicinity of the folding line B ₁ of the thin part 51, that is, the vicinity of the bending part 11 in FIG. 2 is bent so as to draw a gentle curve, Even if it occurs, it becomes shallow and the effect of preventing leakage of body fluid is improved.

Incidentally, the sanitary napkin 3, since the thick site 45 is folded at the bending line B _2, when taken out of the package 1 may be referred to as wrinkle has occurred in the site. However, when the sanitary napkin 3 is worn using the sanitary shorts, the sanitary napkin can be applied with a strong pressing force from the outside by the sanitary shorts, so that the sanitary napkin 3 can be easily applied to the skin. It can be adhered. Therefore, for the thick portion 45, it is not always necessary to consider that the bending rigidity of the portion is particularly low.

  FIG. 6 is a view similar to FIG. 2 showing an example of the embodiment of the present invention. In the sanitary napkin package 1 in this case, the sanitary napkin 3 is folded in four. Even in the package 1, the sanitary napkin 3 is bent at a thin portion 51 having a low rigidity and a small rigidity difference.

FIG. 7 is a diagram showing a stiffness measurement method according to the present invention, taking the sanitary napkin 3 as an example . The sanitary napkin 3 is placed on the horizontal support base 101 so that the top sheet 13 is on the bottom. The sanitary napkin 3 is fixed to the support base 101 with a 2 kg weight 102 placed thereon. Two 80 × 180 mm filter paper (type ANANASHHI) 103 made by TOYO ROSHI KAISHA is inserted between the support table and the sanitary napkin 3, and the end of the filter paper is extended from the support table 101 by 80mm. The sanitary napkin 3 that extends from the table 101 is supported from below. The sanitary napkin 3 keeps the stiffness measurement portion 3 a coincident with the edge 101 a of the support base 101. The sensor part 106 of the digital force gauge (SHIMPO FGC-2) 105 is applied to the sanitary napkin 3 at a point where the dimension a in the horizontal direction from the edge 101a is 20 mm. The sensor unit 106 is vertically lowered at a speed of 20 mm / min, and the maximum value until the vertical dimension b from the edge 101a reaches 5 mm is determined in unit N. In this measurement method, the rigidity of the two filter papers that were overlapped was 0.53N, so the bending rigidity at the measurement site 3a was a value obtained by subtracting 0.53N from the maximum value measured at the measurement site 3a. In addition, when the sanitary napkin 3 has the leak-proof wall 21 as shown in FIG. 3, the portion where the leak-proof wall 21 stands from the inner surface of the sanitary napkin 3 is cut and measured. Moreover, when the sanitary napkin 3 has the flap 17 and wing | blade part (not shown) which extend 20 mm or more from the edge part of the core material 6, the flap 17 is set so that the extension dimension may be 10-15 mm. Cut out the wings and measure.

  About the sanitary napkin in the shape of FIGS. 2 to 4 taken out from the individual bag, the thickness of the thick part is 5 to 7.5 mm, and the thickness of the thin part is 4 mm or less. While measuring the bending curve formed near the rear end and the rigidity and the difference in rigidity at a distance of 20 mm before and after that, the sanitary napkin is worn on a transparent human body model using a sanitary short, and the sanitary napkin We observed the folding curve formed near the rear edge and the fitting condition of the vicinity of the body model surface. Further, as a comparative example, the sanitary napkin having the shape of FIG. 2 taken out from the individual bag has a rigidity exceeding 2N at a distance of 20 mm before and after the folding line formed near the rear end of the sanitary napkin. The fitting state of the sanitary napkin with a rigidity difference exceeding 1.2 N on the surface of the human body model was observed. These observation results are shown in Table 1.

  According to this invention, it becomes possible to manufacture a sanitary napkin package in which a portion near the rear end of the sanitary napkin fits well with the skin.

The perspective view of a sanitary napkin package. The top view of the sanitary napkin taken out from the package. The figure which shows the III-III line | wire cut surface of FIG. The figure which shows the IV-IV line | wire cut surface of FIG. The figure which shows the VV line | wire cut surface of FIG. The figure similar to FIG. 2 which shows an example of an embodiment. The figure which shows the measuring method of bending rigidity.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary napkin package 3 Sanitary napkin 3a Front end part 3b Rear end part 13 Top sheet 14 Back sheet 16 Core material 45 Thick part 51 Thin part B ₁ Folding curve P Length direction Q Width direction

Claims (3)

After a liquid-absorbing core material is interposed between the liquid-permeable top sheet and the liquid-impervious back sheet, the front end portion is positioned in front of the wearer's crotch portion, and the back portion of the wearer is positioned behind An end portion, a length direction extending in a direction connecting the front end portion and the rear end portion, and a width direction orthogonal to the length direction, and at least a central portion of the width direction including the core material A sanitary napkin in which a thick portion having a thickness of 5 mm is formed is folded in a plurality of parallel folding lines extending in the width direction with the surface sheet inside, and stored in a single bag. A sanitary napkin package,
In the sanitary napkin, the thick portion is formed within a range of two thirds of the total length of the sanitary napkin in the length direction and close to the front end, and the thickness in the length direction is the thickness. Near the rear end connected to the thick part , a thin part having a thickness not exceeding 4 mm is formed, and the thin part is formed on the front end along a folding line extending in the width direction. towards being bent, in a state where the extension of the sanitary napkin wherein the length from the rear end portion measured in the thin wall said folding lines formed in the portion with the distance before and after 20mm Bending rigidity in a direction toward the front end is 1 N or less, and a difference in bending rigidity between the folding line and each of the distances of 20 mm in the front and back is 0.6 N or less. body Package of claim 1, wherein the thin wall portion is folded at said fold line formed in the thin-walled portion is overlapped with the thick site. The thin portion that is bent and overlapped with each other in the folding line formed in the thin portion overlaps the thick portion, and the front end portion is bent with the topsheet inside and overlaps each other. The package according to claim 1, wherein the sanitary napkin is folded in four by overlapping the thin portion .

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