JP5024918B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood and vaginal discharge, and more specifically, a pair of left and right vertical embossed grooves in a direction along the longitudinal direction on the surface side. It relates to the formed absorbent article.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.

  Many improvements have been made on this type of absorbent article, and various means for preventing body fluid leakage and the like have been taken. For example, to prevent diffusion of bodily fluids in the width direction, to prevent twisting of the absorbent body, and to raise the central portion of the absorbent body to improve adhesion to the local area, the surface is embossed by hot embossing. There are techniques for forming grooves.

  For example, in the following Patent Document 1, as shown in FIG. 11, a pair of left and right inner sides straddling a longitudinal center line in a direction substantially along the longitudinal direction on the liquid-permeable surface sheet surface side of the sanitary napkin N Convex-shaped longitudinal arc-shaped embossed grooves 50, 50 are formed on the side, and convex-shaped widthwise arc-shaped embossed grooves 51, 51 are formed toward the front and rear ends in a plan view in a direction substantially along the width direction. Absorbent articles are disclosed.

Moreover, in the following patent document 2, as shown in FIG. 12, a pair of left and right longitudinal embosses straddling the longitudinal center line in the direction along the longitudinal direction on the liquid-permeable surface sheet surface side of the sanitary napkin N There is disclosed an absorbent article in which grooves 52, 52 are formed in parallel, and an embossed groove having a substantially oval shape as a whole is formed.
JP 2003-265519 A JP 2003-180734 A

  However, in the case of the embossed groove shape described in Patent Document 1, even if the gap between the body can be filled in the blood discharge port portion, the outer portion is more likely to bend at the embossed groove portion, and the bent portion and the rear end of the blood discharge port are There was a gap from the base of the hips to the base of the buttocks. Further, when pressure is received from the base portions of both legs, wrinkles and twists extend to both the front end side and the rear end side, and thus leakage from the rear diagonal is particularly likely to occur.

  Further, in the case of the embossed groove shape described in Patent Document 2, even if the gap between the body can be filled from the blood drainage port portion to the base of the buttocks, if pressure is applied from the base portions of both legs, Since it extends to both the side and the rear end side, leakage from the rear diagonal is particularly likely to occur.

  Therefore, the main problem of the present invention is to eliminate wrinkles and twists from the back of the blood drainage mouth to the base of the buttocks, so that no gap is formed between the body and the body from the back diagonally. Is to prevent.

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 surface sheet and the back sheet, and a blood drainage site is included on the liquid- permeable surface sheet surface side. In the absorbent article in which the longitudinal embossed groove along the substantially longitudinal direction is formed in the crotch range in the left and right pair,
The longitudinal embossed groove has a shape in which the separation width is narrowed from the rear side to the front side of the absorbent article, joins the front side start ends of the vertical embossed groove, and projects the front side convex to the front side A width direction embossed groove is formed, a rear side width direction embossed groove that joins the rear side ends of the vertical direction embossed groove is formed, and a closed shape embossed groove is formed as a whole. The enclosed area is the middle and high part where the absorber is thickened,
The separation width between the front side start ends of the vertical embossing grooves is 20 to 40 mm, and the separation width between the rear side ends of the vertical embossing grooves is 50 to 60 mm,
The rear side width direction embossed groove is a plane formed by a pair of left and right convex curved portions that are convex on the rear end side of the absorbent article on both side portions, and a concave curved portion that exists between these convex curved portions. It is an embossed groove that forms a substantially W-shaped curve visually,
In the absorbent body, the absorbent article, characterized in that the substantially transverse direction between the longitudinal direction embossed grooves a central position and on the back side, concave embossed grooves along the longitudinal direction of the absorbent article is formed Is provided.

  In the first aspect of the present invention, the longitudinal embossed groove has a shape in which the separation width is narrowed from the rear side to the front side of the absorbent article. Therefore, the absorber sandwiched between the vertical embossed grooves can maintain a sufficient width on the rear side, and even if pressure is applied from the base of both legs, the width of the wrinkles and twists is relatively narrow. Since it extends so as to escape to the front end side, it is difficult for wrinkles and twists to occur on the rear side, and it is difficult to form a gap between the body and the body, so that it is possible to prevent leakage from the rear obliquely.

  Note that “the shape in which the separation width is narrowed from the rear side to the front side of the absorbent article” means that the separation width is gradually narrowed, and in particular, the rear portion has a parallel portion and is gradually separated from the intermediate point. Including the case of narrowing. That is, it is sufficient that there is no portion where the separation width increases as going to the front side.

In the present invention, in order to define the region from the back of the blood drainage port to the base of the buttocks with the embossed groove, the front width direction embossing and the longitudinal embossed groove that join the front side start ends of the vertical direction embossed groove A rear side width direction embossed groove for joining the rear side terminal ends is formed.

In addition, the embossed shape of the rear side width direction embossed groove is an embossed groove that forms a substantially W-shaped curve in plan view, so that when it receives pressure from both legs, It becomes easy to adhere to the body.

  In the present invention, in the absorber, a concave embossed groove is formed along the longitudinal direction of the absorbent article on the back surface side at a substantially central position of the vertical embossed groove, The concave groove shaft part is thinner than the other parts and the rigidity (secondary moment of the cross section) is reduced, so that the deformation performance in the transverse direction is secured with the concave embossed groove as the flexible axis (longitudinal flexible axis). In the mounted state, the flexible shaft portion is deformed so as to be bent in the transverse direction, so that the body fits along the roundness of the buttocks, and the absorber is raised by the flexible shaft. Because it deforms, it can be brought into close contact with the bottom of the buttocks.

As the present invention according to claim 2, wherein the longitudinal embossed grooves, the absorbent article according to claim 1 Symbol mounting is formed by a curve forming the convex shape toward the outside of the absorbent article in a plan view is provided .

In the invention according to the second aspect , the vertical embossed groove is formed by a curved line that is convex toward the outside of the absorbent article in a plan view. The absorber portion sandwiched between the embossed grooves is likely to be raised on the surface side, and can easily bite into the blood drainage opening.

According to a third aspect of the present invention, there is provided the absorbent article according to the first or second aspect, wherein the longitudinal emboss groove has a line width of 0.5 to 3.0 mm.

In the invention according to the third aspect, in order to form a clear embossed groove and improve the feeling of wearing without taking out the entire product, the line width of the vertical embossed groove is 0.5 to 3.0 mm. It is what.

According to a fourth aspect of the present invention, the embossed groove in the front region near the rear end of the longitudinal embossed groove has a relatively higher amount of the high-pressed portion than the low-pressed portion, and the rear side of the vertical embossed groove. The absorbent article according to any one of claims 1 to 3 , wherein the embossed groove in the rear region from the vicinity of the terminal end has a relatively high pressure squeezed portion rather than a high pressure squeezed portion.

In the invention described in claim 4 , the embossing mode is changed between the front side and the rear side with the vicinity of the rear end of the absorbent article in the longitudinal embossed groove as a boundary. That is, from the than relatively low compression portion at the rear side of the front side from the end position to facilitate collapsing the absorber by increasing the high compression portion, whereas a relatively high compression portion is rearwardly of said rear-side end position However, by increasing the pressure-squeezing part, it is difficult for the absorber to be crushed, eliminating wrinkles and twists from the back of the blood drainage port to the base of the buttocks, so that there is no gap between the body To do.

  As described above in detail, according to the present invention, there is no wrinkle or twist between the back of the blood drainage outlet and the base of the buttocks, and no gap is formed between the body and the body, so that there is no leakage from the back diagonally. Can be prevented.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a development view of a sanitary napkin 1 according to the present invention, and FIG. 2 is a view taken along the line II-II in FIG.

  The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a liquid-permeable surface sheet 3 that allows permeation of menstrual blood, cages, and the like, and an intervening sheet between the sheets 2 and 3. Absorbent body 4 made of cotton-like pulp or synthetic pulp, etc., crepe paper 5 surrounding the absorbent body 4 for maintaining the shape and improving the diffusibility of the absorbent body 4, and substantially both side edges of the absorbent body 4 It is mainly comprised from the side nonwoven fabric 6 each arrange | positioned from the part to the side edge part of the said back surface sheet 2, and in the circumference | surroundings of the said absorber 4, the said liquid-impermeable back sheet 2 in the upper-lower-end edge part. And the liquid-permeable surface sheet 3 are bonded to each other by an adhesive such as hot melt or an adhesive means such as heat seal, and the both side edges of the liquid-permeable surface sheet 3 extend laterally from the absorbent body 4. Liquid back sheet 2 , And the side nonwoven fabric 6 are joined by adhesive means such as adhesive or heat sealing, such as a hot melt.

Hereinafter, specifically, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impervious back sheet 2, a sheet material having at least water shielding properties such as polyethylene is used, but in recent years, a material having moisture permeability tends to be used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a 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.

  In addition, when a large number of through holes are formed in the liquid-permeable surface sheet 3, menstrual blood, urine and the like (hereinafter collectively referred to as body fluid) are quickly absorbed, and the dry touch property is improved. It will be excellent.

  The absorbent body 4 is not particularly limited as long as it can absorb and retain body fluids, and piled pulp, airlaid, pulp nonwoven fabric and the like are used. In general, fluffy pulp mixed with water-absorbing polymer powder is preferably used from the viewpoint of absorption function and cost. As shown in the figure, the absorbent body 4 is preferably surrounded by crepe paper 5 for the purpose of shape retention and the like.

As shown in FIG. 1, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the absorbent body 4, and only stops covering the absorbent body 4. Side nonwoven fabrics 6 are respectively disposed over the side edges of the back sheet 2. Specifically, the side nonwoven fabric 6 is made of a nonwoven fabric material that has been subjected to appropriate water-repellent treatment or hydrophilic treatment for the purpose of preventing permeation of menstrual blood, cages, etc., or enhancing the feeling of touch. It is configured using. The side nonwoven fabric 6 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 6 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 18 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. to reliably prevent the passage of body fluids. A water repellent nonwoven fabric coated with is preferably used.

(Embossed groove structure)
On the surface of the liquid-permeable surface sheet 3, longitudinal embossed grooves 7, 7 are formed in the crotch range S including the blood drainage site H along the substantially longitudinal direction in left and right pairs, and the napkin front side continuous to the crotch range S The napkin front side start ends of the vertical embossed grooves 7 and 7 are joined to the part F, and a convex front side width direction embossed groove 8 is formed on the napkin front end side, and the napkin continuous to the crotch range S is formed. Napkin rear end portions of the vertical embossed grooves 7 and 7 are joined to the rear portion B, and a convex rear width direction embossed groove 9 is formed on the rear end side of the napkin. A groove 11 is provided. Moreover, the area | region enclosed by the said embossing groove | channel 11 is the middle-high part 10 to which the absorber 4 was thickened, as FIG. 2 shows. The embossed groove 11 is formed such that the central portion P of the front width direction embossed groove 8 is positioned at the tip of the blood drainage port (small labia), and the longitudinal embossed grooves 7 and 7 are longitudinally formed. It is desirable that the blood drainage site H is located approximately in the center of the direction.

  In the present napkin 1, the vertical embossed grooves 7, 7 are formed in a shape that narrows the separation width from the napkin rear side to the front side. Therefore, even if the medium-high absorber 10 sandwiched between the longitudinal embossed grooves 7 and 7 can maintain a sufficient width on the rear side and receives pressure from the base portions of both legs as shown in FIG. Since the wrinkles and twists extend so as to escape to the front end side where the separation width is relatively narrow, wrinkles and twists are not easily generated on the rear side 12, and it is difficult for gaps to be formed between the body and the rear slant. It will be possible to prevent leakage from.

  It is desirable that the shape (width, length, gradient) of the vertical embossed grooves 7 and 7 is matched to the shape of the crotch of the body. Specifically, the directional embossed grooves 7 and 7 have a separation width FL of 20 to 40 mm, preferably 25 to 35 mm, and a separation width BL of the rear end of the napkin of 50 to 60 mm. desirable. When the separation width FL at the leading end of the napkin front side is less than 20 mm, it becomes less than the width of the blood drainage port and it is difficult to prevent leakage. If it exceeds 40 mm, the difference from the separation width BL at the rear end of the napkin becomes small and the inclination (gradient) of the longitudinal embossed grooves 7 and 7 becomes gentle, so that wrinkles and twists do not easily escape to the front end side. Wrinkles and twists will occur on the rear side 12. On the other hand, the dimension of the separation width BL at the rear end of the napkin is set as the width of the portion corresponding to the end of the blood drainage port of the average Japanese body type.

  The line width of the vertical embossed grooves 7, 7 is preferably 0.5 to 3.0 mm. If the line width is less than 0.5 mm, a clear embossed groove cannot be formed. If the line width exceeds 3.0 mm, the entire product is hardened and the wearing feeling is impaired.

  It is desirable that the vertical embossed grooves 7 and 7 are formed with curves that form a gentle convex shape toward the outside of the absorbent article in plan view. When pressure is applied from the leg portion, the absorbent body portion sandwiched between the longitudinal embossed grooves 7 and 7 is likely to rise to the surface side, and can easily bite into the blood outlet.

  As shown in FIG. 4, the embossed groove 11 is formed so that the embossed groove in the front region EF has a relatively high pressure squeezed portion rather than the low pressure squeezed portion. And it is desirable that the embossed groove in the rear region EB has a relatively larger amount of the low-pressure squeezed portion than the high-pressure squeezed portion than the vicinity of the rear end of the longitudinal embossed grooves 7 and 7. In the illustrated example, all the embossed grooves in the front region EF are high-pressure squeezed embosses 12a, and the embossed grooves in the rear region EB are alternately squeezed with high-pressure squeezed embosses 12a and low-pressure squeezed embosses 12b. The area of the emboss 12b is increased. In the front region EF, the absorbent bodies 4 and 10 are easily crushed by increasing the amount of the high-pressure portion relative to the low-pressure portion, whereas in the rear region EB, the pressure portion is relatively lower than the high-pressure portion. By increasing the number, the absorbers 4 and 10 are less likely to be crushed, eliminating wrinkles and twists from the back of the blood drain opening to the base of the buttocks so that no gap is formed between the body and the body. .

  As shown in FIG. 5, the rear side width direction embossed groove 9 has a substantially crescent shape in plan view, with the groove width being maximized at the center in the width direction and gradually narrowing toward the side. It can be an embossed groove. By forming the embossed groove having a substantially crescent shape in plan view, the embossing rigidity is increased in the central part, and the embossing rigidity is gradually decreased toward the side part. You can make it difficult to twist. In this case, the high pressing portion 12a may be formed over the entire length of the groove as shown in FIG. 6 (A). However, as shown in FIG. In order to make it hard to generate | occur | produce, you may make it form along a groove width direction, putting the low pressing part 12b in the middle.

On the other hand, in the absorber 4, as shown in FIG. 7, a concave emboss groove 13 is formed along the longitudinal direction of the napkin at the substantially central position in the width direction between the vertical emboss grooves 7 and 7 on the back surface side. It is also possible to do. The concave embossed groove 13 has a concave groove shaft portion thinner than the other portions, and the rigidity (second moment of cross section) is reduced, so that the concave embossed groove 13 is a flexible shaft (longitudinal flexible shaft). Transformability in the transverse direction is ensured, and in the mounted state, the flexible shaft portion is deformed so as to be bent in the transverse direction, so that the body fits along the roundness of the buttocks and the flexible Since the absorber is deformed so as to be raised by the shaft, it can be brought into close contact with the recessed portion of the buttocks.

[Other examples]
(1) In the above embodiment, the left and right pairs of the vertical embossed grooves 7, 7, the front side width direction embossed groove 8 and the rear side width direction embossed groove 9 form a closed embossed groove 11 as a whole. However, as shown in FIG. 8, the front side width direction emboss groove 8 and the rear side width direction emboss groove 9 may be discontinuous from the pair of left and right vertical emboss grooves 7, 7.
(2) Also, as shown in FIG. 9, the front side width direction emboss groove 8 and the rear side width direction emboss groove 9 are omitted, and only the left and right pair of vertical emboss grooves 7, 7 are formed. It may be.
(3) As shown in FIG. 10, the rear side width direction emboss 9 has a pair of left and right convex curved portions 9a, 9a that are convex on the rear end side of the absorbent article on both side portions and the convex curved line. It can also be an embossed groove formed of a concave curved portion 9b existing between the portions 9a and 9a and forming a substantially W-shaped curve in plan view. By forming an embossed groove having a substantially W-shaped curve in a plan view, when pressure is applied from both leg portions, it becomes a mountain fold so as to be raised toward the body side, thereby making it easier to adhere to the body.
(4) In the above embodiment, the left and right pairs of the vertical embossed grooves 7, 7, the front side widthwise embossed groove 8 and the rear side widthwise embossed groove 9 form a closed embossed groove 11 as a whole. However, embosses other than the emboss groove 11 can be added separately.

1 is a plan view of a sanitary napkin 1 according to the present invention. It is the II-II arrow directional view of FIG. It is a figure which shows the formation state of a wrinkle and twist in the embossing groove | channel 11 area | region. FIG. 4 is a plan view of a main part showing a form of forming embossed grooves 11. It is a principal part top view which shows the other formation aspect of the embossing groove | channel 11. It is a principal part top view which shows the other formation aspect of the embossing groove | channel 11. It is a principal part top view which shows the formation aspect of the back surface side concave embossed groove | channel 13. FIG. It is a top view which shows the modification of the sanitary napkin 1 which concerns on this invention. It is a top view which shows the modification of the sanitary napkin 1 which concerns on this invention. It is a napkin top view which shows the other example of a rear part width direction embossing 9. FIG. It is a perspective view which shows the conventional napkin (the 1) in which the vertical direction embossing was formed. It is a top view which shows the conventional napkin (the 2) in which the vertical direction embossing was formed.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impermeable back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Side nonwoven fabric, 7 ... Longitudinal embossed groove, 8 ... Front arc shape Embossed in the width direction, 9 ... Rear arc-shaped embossed in the width direction, 10 ... Middle-high part, H ... Blood drainage site

Claims (4)

An absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and on the liquid-permeable surface sheet surface side, there are left and right longitudinal emboss grooves along the longitudinal direction in the crotch region including the blood drainage site. In the formed absorbent article,
The longitudinal embossed groove has a shape in which the separation width is narrowed from the rear side to the front side of the absorbent article, joins the front side start ends of the vertical embossed groove, and projects the front side convex to the front side A width direction embossed groove is formed, a rear side width direction embossed groove that joins the rear side ends of the vertical direction embossed groove is formed, and a closed shape embossed groove is formed as a whole. The enclosed area is the middle and high part where the absorber is thickened,
The separation width between the front side start ends of the vertical embossing grooves is 20 to 40 mm, and the separation width between the rear side ends of the vertical embossing grooves is 50 to 60 mm,
The rear side width direction embossed groove is a plane formed by a pair of left and right convex curved portions that are convex on the rear end side of the absorbent article on both side portions, and a concave curved portion that exists between these convex curved portions. It is an embossed groove that forms a substantially W-shaped curve visually,
In the absorbent body, the absorbent article, characterized in that the substantially transverse direction between the longitudinal direction embossed grooves a central position and on the back side, concave embossed grooves along the longitudinal direction of the absorbent article is formed . The longitudinal embossed grooves, the absorbent article according to claim 1 Symbol mounting is formed by a curve forming the convex shape toward the outside of the absorbent article in a plan view. The absorbent article according to any one of claims 1-2 line width of the longitudinal embossed grooves have a as a 0.5 to 3.0 mm. The embossed groove in the front region from the vicinity of the rear end of the longitudinal embossed groove has a relatively high pressure portion than the compressed portion, and the embossed groove in the rear region from the vicinity of the rear end of the vertical embossed groove. The absorbent article according to any one of claims 1 to 3 , wherein the pressure-squeezed part is relatively larger than the pressure-squeezed part.

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