JP6531378B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles, and in particular to disposable diapers.

  In absorbent articles such as disposable diapers (hereinafter, also simply referred to as "diapers"), various improvements have been made to improve the function and the feeling of wearing.

  Absorbent articles such as disposable diapers absorb most of the body fluid discharged by the absorber. Here, if there is a gap between the absorbent article and the body, the body fluid will flow out and cause a leak, so adhesion is important as one of the functions required of the absorbent article. However, in particular, after the absorbent article absorbs the body fluid, the space between the skin and the absorbent article becomes humid, while the absorbent article adheres, resulting in poor air permeability. Therefore, the absorbent article is required to have not only adhesiveness but also air permeability. In particular, diapers have a wide covering area covering the entire lower abdomen such as belly, buttocks and crotch region, and absorb a large amount of body fluid such as urine to be easily steamed.

  As seen in Patent Document 1, regular irregularities such as a zigzag pattern are formed on the surface sheet of the absorbent article that is in direct contact with the skin of the absorbent article while ensuring the absorbability and suppressing the stuffiness, and convex on the skin. It is described that the contact area with the skin is reduced and the stuffiness and blurring are suppressed by contacting the tip of the part as compared with the one having no unevenness.

Unexamined-Japanese-Patent No. 2003-275239

  However, the diaper covers a portion to which a seating pressure is applied, such as buttocks and crotch, and the pressure on the absorbent body and the top sheet is frequently applied by seating.

  The surface sheet in the invention described in Patent Document 1 is made of a non-woven fabric, and the non-woven fabric is embossed to form asperities. Since the surface sheet itself is not so thick, the height difference of this unevenness is also slight. Therefore, the load at the time of sitting partially crushes the convex portion, and there is a case where the air permeability effect by the concavo-convex processing can not be obtained. In particular, since the diaper covers a portion to which a large load at the time of sitting is applied, such as buttocks and crotch, deformation due to the sitting pressure becomes a problem as compared with the sanitary napkin.

  An object of the present invention is to provide an absorbent article which can be hardly deformed even by a force applied by various movements of the body, such as a load by seating, and can maintain breathability.

An absorbent article according to the present invention is an absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, the absorbent article includes front ventilation grooves forming region extending to the rear body portion from the body portion through the crotch portion to the surface sheet side, the ventilation groove forming region is compressed form having a side wall and a bottom wall been comprises ventilation groove, the said topsheet in the ventilation groove and the absorbent body are integrally joined, wherein the surface sheet before the thickness of the topsheet and the absorbent body is compressed portion of the vent groove and wherein the 1 / 4-1 / 7 der Rukoto thickness of the absorber.

Further, the vent groove forming region may be formed in a width direction central portion orthogonal to the longitudinal direction of the absorbent article from the front body portion to the back body portion via the crotch portion .

Further, the topsheet in the ventilation groove is joined before Symbol absorber by the adhesive.

Further, the ventilation groove is made intermittently or continuously form the ventilation channel forming region, in particular, when the absorbent article is worn, the virtual line leading as dorsal inseam from the ventral side of the wearer It may extend in a direction inclined with respect to

  In addition, even if the ventilation groove is provided with a first ventilation groove extending in a first direction inclined to one side with respect to the imaginary line, and a second ventilation groove extending in a second direction inclined to the other side. Good.

  Since the absorbent article of the present invention is provided with the ventilation groove formed by integrally joining the surface sheet and the absorber, the ventilation property can be maintained without collapsing the ventilation groove even by the seating pressure.

It is a three-dimensional projection which shows the external appearance of Embodiment 1 which applied the absorbent article by this invention to the unfolding type disposable diaper. It is the three-dimensional projection figure which looked at the lower body which wore the diaper shown in FIG. 1 from the back side. It is a three-dimensional projection figure which expand | deploys and shows the diaper shown in FIG. 1 in the decomposition | disassembly state. It is the partial top view which made the top sheet of the diaper shown in FIG. 1 up. It is sectional drawing of the diaper shown in FIG. It is an enlarged view which shows an example of the ventilation groove part of the diaper shown in FIG. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a partial top view which shows the modification of a ventilation groove pattern. It is a partial top view which shows the modification of a ventilation groove pattern. It is a partial top view which shows the modification of a ventilation groove pattern. It is a perspective view which shows the measuring apparatus which measures the permeability of a diaper.

  Embodiments of the absorbent article according to the present invention will be described in detail with reference to FIGS. 1 to 12.

  In the appearance of Embodiment 1 in which the present invention is applied to a spread type disposable diaper, a stereographic projection seen from the front side is shown in FIG. 1, and a stereographic projection seen from the back side is shown in FIG. FIG. 2 shows the lower half of the unfolded disposable diaper as seen from the back when the baby wears it. Furthermore, it is shown in FIG. 3 in the split state in which the unfolded disposable diaper shown in FIGS. 1 and 2 is broken and expanded.

  The unfolded disposable diaper (which may be simply referred to as a diaper) 10 in this embodiment has a front body region 10F, a back body region 10R, and a crotch region 10C connecting the front body region 10F and the back body region 10R. And. In addition, a waist-surrounding opening 10W is formed which surrounds a portion of the waist of the wearer by the front body region 10F and the back body region 10R when worn. Similarly, the front body region 10F and the lower end crotch region 10C of the rear body region 10R form a pair of left and right leg openings 10L surrounding the thighs of the legs of the wearer.

  As shown in FIG. 2, when worn, the front body region 10F is located on the ventral side of the wearer, and the back body region 10R is located on the dorsal side of the wearer. The crotch region 10C covers the wearer's crotch, and the wearer's legs are respectively passed through the left and right pair of leg openings 10L. Therefore, the leg-surrounding opening 10L is located anywhere from the base to the thigh of the wearer's legs.

  In the rear body region 10R of the diaper, a discarding tape 10T is provided to be small and rounded when the diaper is discarded.

  The imaginary line P extends from the ventral side to the dorsal side in the diaper central portion through the crotch portion. Specifically, for example, when the waist side of the diaper is on the upper side and the crotch side is on the lower side, the imaginary line P extends along the diaper surface in the vertical direction and also via the crotch portion on the back side It extends vertically. In other words, the vertical direction is a direction along the central axis of the body from the head to the crotch of the wearer, and the imaginary line P extends along the central axis of the body.

  As shown in FIG. 3, the diaper 10 in the present embodiment is formed by sequentially overlapping and joining the cover sheet 11, the back sheet 12, the absorbent body 13, and the top sheet 14 touching the skin of the wearer in order from the outside. It is. Furthermore, the cover sheet 11 is subdivided into a pad cover sheet 11A, an inner cover sheet 11B, and an outer cover sheet 11C which are stacked under the back sheet 12, and both are formed of a thin non-woven fabric in order to obtain a good touch. The left and right side edges of the inner cover sheet 11B and the outer cover sheet 11C defining the front body region 10F and the back body region 10R of the diaper 10 are joined together to form a closing portion 10J. As a result, the front waist opening 10W is defined. The inner cover sheet 11B and the outer cover sheet 11C are separated into two in the crotch region 10C, and the pad cover sheet 11A is exposed in the crotch region. Therefore, the pair of left and right leg openings 10L surrounding the thighs of both legs are defined by the end of the pad cover sheet 11A and the end of the closing portion 10J. The liquid-impermeable back sheet 12 is joined to the pad cover sheet 11A, and the above-mentioned absorbent 13 is disposed between the back sheet 12 and the liquid-permeable top sheet 14 via the absorbent 13 The top sheet 14 is joined to the back sheet 12. The inner cover sheet 11B and the outer cover sheet 11C may be a single continuous sheet of which the crotch portion is also continuous. Further, the leg opening 10L may be in a form in which gathers of thread rubber are brought close.

  FIG. 4 is a partial top view of the crotch portion of the diaper 10 as viewed from the top sheet 14 side.

  The absorber 13 of the present embodiment located below the top sheet 14 is mainly composed of pulp and a super absorbent resin (Super Absorbent Polymer, hereinafter also referred to as “SAP”). The absorber 13 has an elongated shape so as to extend over the front, crotch, and back. The front body part M1, the crotch part M2, and the rear body part M3 are divided into three. The crotch portion M2 is formed with a pair of arc-shaped notches 13A in accordance with the pair of left and right leg openings 10L surrounding the thighs of both legs. The notch 13A may not be formed depending on the size of the absorber 13. Moreover, although the absorber 13 of this embodiment is provided with the notch part 13A and the width of a center part is an hourglass type whose width is narrower than the front and rear ends, the shape of the absorber of the present invention is Not exclusively. Assuming that the front and back body parts are in the front and back (up and down) direction, and the direction orthogonal to it is the left and right directions, for example, the corners of the front and back (up and down) edges are dropped round It includes various shapes such as circular ones, rectangular ones with the same length in front and rear (upper and lower), and the like.

  Then, as shown in FIG. 4, a plurality of ventilation grooves 21 are formed by performing regular embossing from the surface of the top sheet 14 toward the absorber 13. In the present embodiment, the ventilation groove 21 is not formed up to the end of the absorbent body 13 in the width direction (left and right direction in FIG. 4), but is formed in a band shape at the center. The region where the ventilation groove 21 is formed is referred to as a ventilation groove formation region N1, and the region where the ventilation groove 21 is not formed on both ends is referred to as a ventilation groove non-formation region N2. If the ventilating groove 21 is provided at least at the central portion, the ventilating effect can be obtained as compared with the one having no groove. Further, it goes without saying that the ventilation groove 21 may be provided up to the end of the absorber 13. Therefore, according to the present invention, the vent groove non-forming region N2 may not be provided.

  FIG. 5 is a view showing a cross section of the ventilation groove 21 extending in the form of an oblique lattice. The ventilation groove 21 is formed by squeezing the top sheet 14 and the absorber 13 from the surface (skin contact surface) of the top sheet 14 in contact with the skin. Specifically, an adhesive is applied to the surface of the topsheet 14 in contact with the absorbent 13, and both the topsheet 14 and the absorbent 13 are squeezed by embossing. Thus, the top sheet 14 and the absorbent body 13 are engaged and integrally joined in the entire groove extending from the bottom (bottom wall) 22 a to the wall (side wall) 22 b of the ventilation groove 21. Moreover, the thickness which consists of the top sheet 14 and the absorber 13 in the bottom part of the ventilation groove 21 is 1/6 of the thickness when not squeezing. Therefore, the depth corresponds to about 80% of the original thickness of the top sheet 14 and the absorber 13 laminated, which is deeper than when the top sheet 14 is made uneven. The compressibility of the absorber by squeezing is preferably about 4 to 7 times.

  As described above, by making the ventilation groove 21 deep and the wall surface 22 b integrally joined to the top sheet 14 and the absorber 13, it becomes deeper and stronger than the unevenness of the top sheet alone. . Therefore, the wall surface 22b of the groove 21 is not easily crushed and the groove 21 is not buried even in the seating load.

  In addition, by forming the grooves 21, a gap extending over the absorbent body 13 is intermittently formed on the surface that touches the skin of the diaper, so that sufficient ventilation can be ensured by the gap.

  The side wall 21 d of the groove 21 may extend orthogonal to the bottom wall 21 c as shown in FIG. 5 or may be inclined. That is, the groove 21 may have a V-shaped cross section narrowing toward the bottom.

  Here, the ventilation groove 21 may be a continuous groove structure which continues to be compressed at a constant pressure, or may be formed by arranging embossed patterns such as a plurality of dots.

  FIG. 6 shows an example in which the ventilation grooves 21 are formed by a plurality of dot-like embossed patterns in a range Q indicated by an alternate long and short dash line spanning the ventilation groove formation region N1 and the ventilation groove non-formation region N2 in FIG.

  The recesses 22 intermittently squeezed from the surface of the top sheet 14 toward the absorber 13 are arrayed by the dot-like emboss pattern. By arranging the recesses 22 at a certain distance, the absorber in the vicinity of the recess 22 is pushed down to form a recessed portion 23 recessed more than a portion without an embossed pattern (hereinafter, also referred to as a “main absorption area”). . Therefore, by continuously forming the recess 22, the ventilation groove 21 is formed by the recess 22 and the recessed portion 23.

  The width L1 of the vent groove 21 is about 6 mm, and the center-to-center distance L2 between adjacent recesses is about 6 mm. The range of 1 mm ≦ L1 ≦ 8 mm, 1 mm ≦ L2 ≦ 8 mm is preferable.

When the thickness of the non-squeezed absorber 13 in the center of the main absorption region 24 is ³ to 3.6 mm and the density is 0.16 g / cm ³ , the thickness of the absorber 13 in the recess 22 is 0.5 to 0.6 mm The density is 0.96 g / cm ³ . The thickness of the absorber 13 of the depressed portion 23 is 1 to 1.2 mm, and the density is 0.48 g / cm ³ . As described above, when the density difference between the recess 22 and the absorber at the center of the main absorption region 24 is about 6 times, the arrangement interval of the recess is such that the density difference between the recess 22 and the recess 23 is about 2 to 3 times. It is desirable to adjust L2.

  Also in the case of the groove 21 by such intermittent embossing, the compression ratio is preferably about 4 to 7 times in the portion of the recess 22. The recess 22 is preferably squeezed at such a compression ratio that the absorber 13 sufficiently compresses the gap 23 between the recesses 22 as well. As in the first embodiment, the compression rate is not limited to this range, and may include other ranges depending on the material of the absorber 13 and the liquid to be absorbed.

  FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.

  As shown in FIG. 7, in the embossing process, an adhesive is interposed between the top sheet 14 and the absorber 13 to squeeze the top sheet 14 and the absorber 13 together from the surface of the top sheet 14, The top sheet 14 and the absorber 13 are completely in close contact with each other in the recess 22. Specifically, the fibers of the top sheet 14 are in a state of being engaged with the surface fibers of the absorbent 13 by pressing. Therefore, as in the case of forming the continuous ventilating groove 21 by squeezing, the depths of the recess 22 and the recess 23 are sufficiently deep so that they can not be easily crushed and buried even in the seating load.

  FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG.

  As shown in FIG. 8, the recessed portion 23 is at a higher position than the recess 22 but at a lower position than a portion where the vent groove 21 is not formed. Therefore, by forming the recesses 22 at predetermined intervals, it is possible to form grooves extending obliquely as in the continuous embossing.

  Further, referring back to FIG. 4, the vent groove 21 of the present embodiment includes a first vent groove 21 a extending obliquely to one side (right in the figure) in the width direction of the absorber, and the other side (in the figure). , And a plurality of second ventilation grooves 21b extending obliquely to the left). The position of the virtual line P on the absorber 13 extends from the upper end of the front body portion M1 toward the lower end of the rear body portion M3. Specifically, as shown in FIG. 4, when the absorber 13 has an elongated shape, it extends in the longitudinal direction. The vent groove 21 extends obliquely with respect to the imaginary line P. That is, the first ventilation groove 21a is inclined at an angle α to one side with respect to a direction along the side with the imaginary line P as an axis, for example, the longitudinal direction, and the second ventilation groove 21b is an angle β to the other side. Tilt at. The angle α and the angle β may be the same or different. In addition, in FIG. 4, the plurality of first ventilation grooves 21 a are inclined at the same angle, and are arranged at regular intervals. That is, although the respective first ventilation grooves 21a are arranged in parallel and at regular intervals, the present invention is not limited to this, but includes ones in which the spacing between the grooves is not constant and one in which the inclination angles of the respective grooves are different. The same applies to the second ventilation groove 21b.

  In addition, the absorber 13 is not limited to an elongated shape, and may have the same length such as a square. Also in this case, the first ventilation groove 21a and the second ventilation groove 21b are inclined and extend in the direction along the side.

  By providing the vent groove 21 inclined with respect to the virtual line P, it is possible to secure breathability even by various movements of the body.

  That is, although a force is applied to the diaper in various directions according to the movement of the body, the influence of the tensile force by the back and forth movement of the leg such as walking or baby's high and high among others is large. The crotch portion is pulled diagonally to bring the legs alternately forward and backward. Therefore, the absorber is liable to be deformed obliquely. In particular, when the diaper inhales and swells, it adheres to the skin and becomes easier to steam. Furthermore, if the leg is biased to the center part of the crotch due to the back and forth movement of the leg, the air permeability of the crotch part will be reduced.

  However, in the diaper of the present embodiment, deformation of the absorber 13 is suppressed also by the movement in the front-rear direction of the legs by obliquely extending the ventilation groove 21 in which both the top sheet 14 and the absorber 13 are squeezed. Furthermore, even if urine is included and the absorber 13 is expanded, the air grooves arranged at regular intervals in the oblique direction always maintain a gap with the skin and ensure air flow. In addition, since the main absorption area 24 surrounded by the ventilation groove 21 expands, even if the absorber 13 is expanded including urine, the expansion of the main absorption area 24 in a diagonal direction is caused. Even if the diaper is pulled diagonally by the movement of the legs, the main absorbent region 24 is divided in the diagonal direction by the ventilation groove 21, so that the skin comes into contact with a gap. Then, the air passage is always secured in the oblique direction. Therefore, the air permeability of the crotch can always be maintained in a good state.

  For example, if the vent groove is only in the direction along the imaginary line P, the portion surrounded by the vent groove will be striped. The absorber inside the striped portion is broken or twisted by the diagonal force due to the back and forth movement of the leg. In this case, even if the user sucks urine, the urine stagnates at a point where the absorber has run out and swells greatly and sticks to the skin. Therefore, even if there is a vent groove, the bulging absorbent body shields, making it difficult for air to flow to the entire crotch, and the air permeability is lowered compared to the groove in the oblique direction. As described above, the ventilation groove 21 in the oblique direction can ensure ventilation even by the back and forth movement of the leg, and is effective in preventing the skew and breakage of the absorber 13 and maintaining the crotch part in a comfortable state.

  In addition, the ventilation groove 21 may not extend to the end of the diaper.

(Modification)
The ventilation grooves 21 may have a honeycomb shape as shown in FIG. 9 as well as the oblique lattice shape (Modified Example 1). Also in this case, although the intermittent ventilation grooves 21 are formed, the skew of the absorber 13 due to the back and forth movement of the leg is suppressed and the movement of the leg is not impeded even when it is expanded including urine. In addition, ventilation can be secured.

  Further, as shown in FIG. 10, the ventilation groove 21 may not be provided at the urination position 25 with priority given to the feeling of touch (Modification 2). Although the air permeability is inferior to that in which the ventilation groove 21 is provided at the urination position (for example, the one shown in FIG. 4), since the ventilation groove 21 is present before and after the urination position, In comparison, the air permeability after urination is improved.

  Further, as shown in FIG. 11, the oblique ventilation groove 21 may be in only one direction (Modification 3). Since the main absorption region 24 has an oblique stripe shape, the shape retention of the main absorption region 24 is inferior to that of the oblique lattice shape of FIG. 4. However, since the venting groove 21 is formed obliquely, the absorber 13 can easily follow the movement of the body as compared with the ventilating groove 21 along the imaginary line P, and the twisting and breakage hardly occur.

  Also, the recess 22 may have various shapes such as a semi-circle, a quadrilateral, and a triangle as well as a circular dot.

  In addition, not only the one having the top sheet 14 disposed directly on the absorber 13 but also one having the top sheet 14 disposed after wrapping the absorber 13 with a hydrophilic sheet. Moreover, you may provide the liquid diffusion sheet which improves liquid diffusivity between the top sheet 14 and a hydrophilic sheet, or between a hydrophilic sheet and the absorber 13 as needed. This sheet makes the body fluid more likely to diffuse. In addition, the hydrophilic sheet may be attached so as to wrap the absorber 13, or may simply be disposed so as to overlap on the front and back without wrapping the end of the absorber 13.

  In addition, although the lower-body figure which wore the diaper in FIG. 2 has shown the standing-up state, this invention is not intended only when standing and walking, front and back of legs, such as turning high and high and low of a baby It exerts an effect on general exercise.

(Evaluation of breathability)
The air permeability of the diaper of the present embodiment provided with the ventilation groove 21 was compared with a conventional diaper provided with no groove.

(Evaluation method)
As shown in FIG. 12, the measuring device 100 is composed of a cylinder 101, a bottom plate 102, a water balloon 103 into which 17 ml of water is injected, and a support portion 105. The cylinder 101 has an inner diameter d1 of 26 mm, an outer diameter d2 of 30 mm, and a height of 700 mm, and stands vertically to the bottom plate 102, and is a transparent cylinder. The joint portion of the bottom plate 102 with the cylinder 101 has an opening 104 with the same diameter d 1 along the inner diameter of the cylinder 101. The bottom plate 102 is 100 mm square. The cylinder 101 is fixed to stand on the bottom plate 102 by four supporting portions 105. At the time of measurement, the bottom plate 102 is pressed from above with four weights 106 of 190 g each.

The measurement is performed as follows.
(1) Fully wet the inside of the cylinder 101 with edible oil.
(2) Next, the measuring instrument 100 is placed on a plate such as a desk or a picture plate with the bottom plate 102 as the bottom. In this mounted state, the water balloon 103 is inserted into the cylinder 101 from the upper end of the cylinder 101 (the end positioned on the vertical direction at the time of measurement). At this time, the time taken for the water balloon 103 to move from the measurement start point Q1 located 250 mm from the upper end of the cylinder 101 to the measurement end point Q2 located 550 mm from the upper end is measured (blank state) Measurement). The measurement is performed by a timer or the like which is activated and stopped when the optical sensor provided at each of the measurement start point Q1 and the measurement end point Q2 detects the water balloon 103. Alternatively, the operation is performed by visually operating the stop watch or the like.
(3) Next, the measuring instrument 100 is placed on the diaper 10 to be measured. Then, the weight 106 is evenly placed on the measurement plate 102 and fixed. The weight assumes the load at the time of wearing, and it is assumed that the absorber slightly collapses in the height direction by applying a load from the top sheet side of the diaper by the weight.
(4) The water balloon 103 into which 17 ml of water has been injected is immersed in edible oil and oiled for 2 seconds, and then the water balloon 103 is inserted from the upper end of the cylinder 101. Then, similarly to the measurement in the blank state, the time required for the water balloon 103 to move from the measurement start point Q1 to the measurement end point Q2 is measured.
(5) The value obtained by subtracting the measurement value in the blank state of (2) from the measurement value of (4) is taken as the air permeability of the diaper 10 to be measured.

  The air in the cylinder 101 into which the water balloon 103 is inserted flows from the opening 104 at the lower end through the bottom plate 102 and out, but when placed on the diaper, the diaper has a resistance to air flow and The air flow in the cylinder 101 stagnates more than in the blank state. In addition, as the air permeability of the diaper is worse, the air in the cylinder 101 becomes a resistance, and it takes more time for the water balloon 103 to fall. Therefore, as the time required for the water balloon 103 to fall is shorter, it can be said that the diaper is breathable.

  By such a measurement method, the conventional diaper without a ventilation groove was compared with the diaper 10 in which the ventilation groove of the diagonal lattice shown in FIG. 4 was formed in the longitudinal direction of the absorbent 13 with respect to air permeability.

  In Table 1, the measuring instrument 100 is installed in each of the ventral, crotch and dorsal divided regions, that is, in the center of each region of the front body portion M1, the crotch portion M2, and the back body portion M3 in FIG. Shows the result of measurement.

  The numbers are in seconds.

  As shown in Table 1, the diaper of the embodiment 1 having the ventilation groove has higher air permeability than the conventional diaper without the ventilation groove in all regions of the front body part, the crotch part and the back side part. .

  As described above, by providing the diaper with the ventilation groove in which both the top sheet and the absorbent body are squeezed, the air permeability is improved in all areas of the diaper, and the occurrence of stuffiness and blurring in the diaper after urination is suppressed. Do.

  In addition, the ventilation channel is secured without collapsing even by the load from the four weights. That is, the ventilating groove of this embodiment does not get dented by the load at the time of seating of a wearer.

  In addition, the structure of the diaper 10 which this invention makes object is not necessarily limited to the above-mentioned pants type, as long as it is a diaper including the structure of the absorbent article specified by the claim, It may have any configuration. For example, the present invention is applicable even to well-known unfolded disposable diapers and urine leak pads.

  In addition, the present invention is applicable not only to diapers for infants but also to various absorbent articles such as diapers for adults and urine leak pads.

10 Disposable diaper 10F Front body area 10R Back body area 10C Crotch area 10W Waist around opening 10L Leg around opening 10J Closing section 10T Disposal tape 11 Cover sheet 11A Pad cover sheet 11B Inner cover sheet 11C Outer cover sheet 12 Back sheet ( Back sheet)
13 Absorber 14 Top sheet (front sheet)
17 thread rubber 18 side sheet 19 thread rubber 21a 1st groove 21b 2nd groove 22 form loss control section 100 measuring instrument 101 cylinder 102 bottom plate 103 water balloon

Claims (11)

An absorbent article comprising: a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet.
The absorbent article has a vent groove forming area extending from the front body portion to the back body portion via the crotch portion on the surface sheet side,
The venting area includes a squeezed venting channel having side walls and a bottom wall,
The surface sheet and the absorber are integrally joined in the vent groove;
Wherein Ri the topsheet and 1 / 4-1 / 7 der thickness of the topsheet and the absorbent body in the thickness of the absorber prior to expression of a portion of the ventilation channel,
Said vent groove, and wherein a recess is present the absorber bottom throughout the Rukoto formed continuously by a recessed portion absorber ambient is formed by being depressed by squeezing the recess Absorbent article.   The vent groove forming region is formed in a width direction central portion orthogonal to the longitudinal direction of the absorbent article extending from the front body portion to the back body portion via the crotch portion. The absorbent article according to 1.   The absorbent article according to claim 1 or 2, wherein in the vent groove, the surface sheet is bonded to the absorbent body by an adhesive.   The absorbent article according to any one of claims 1 to 3, wherein the ventilation groove is formed intermittently or continuously in the ventilation groove formation region.   The said ventilation groove is extended in the direction which inclines to the virtual line which goes through crotch from a belly side of a wearer to a back side, when the said absorbent article is worn. The absorbent article as described in any one of to 4.   The vent groove includes a first vent groove extending in a first direction inclined to one side with respect to the imaginary line, and a second vent groove extending in a second direction inclined to the other side. The absorbent article according to item 5.   The absorbent article according to claim 6, wherein the first ventilation groove and the second ventilation groove are inclined at an angle of 10 degrees or more and less than 80 degrees with respect to the imaginary line.   The absorbent article according to claim 6 or 7, wherein the first vent groove or the second vent groove inclined on the same side and adjacent to each other has a distance of 10 mm or more and less than 100 mm.   The air vent groove forming region does not reach both ends of the absorbent article in the width direction orthogonal to the imaginary line, and any one of claims 6 to 8 subordinate to claim 5 An absorbent article according to any one of the preceding claims.   The ratio of the length of the said ventilation groove formation area in the said width direction is 30% or more and 80% or less, The absorbent article of Claim 9 characterized by the above-mentioned.   The absorbent article according to any one of claims 1 to 10, wherein the absorbent body is a disposable diaper having a size extending over the front, the crotch, and the back.

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