JP2006014792A - Absorbent implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent implement preventing leakage of body fluid such as menstrual blood and giving a wearer no discomfort due to wetting. <P>SOLUTION: This absorbent implement 1 includes a surface side sheet 2 having permeability, a water absorbent layer 3 retaining the body fluid absorbed via the surface side sheet 2, a rear side sheet 5 having impermeability, and a water conducting layer 4 interposed between the water absorbent layer 3 and the rear side sheet 5. At least a part of a longitudinal intermediate part of the surface side sheet 2 is brought into contact with the water conducting layer 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to absorbent articles such as sanitary napkins, feminine hygiene pads, and urinary incontinence pads.

  Various absorbent devices such as sanitary napkins, panty liners, urinary incontinence pads, disposable diapers have been developed. When a large amount of body fluid is drained from the wearer, the body fluid flows out from the surface of the absorbent device and leaks, or even if it does not flow out, the surface of the absorbent device gets wet and gives the wearer discomfort due to moisture. There is a case. In these absorbent devices, it is very important to prevent the side and front and back leakage of body fluids. A typical technique for solving this problem is described in Patent Document 1. In this conventional technique, in order to increase the absorbency and prevent liquid leakage, a projecting portion having a three-dimensional shape is formed in the central portion in the longitudinal direction, and a recess is formed in the outer periphery of the projecting portion. This is an absorbent device.

JP-A-11-33054

  Increasing the amount of the absorbent to form the protruding portion at the center in the longitudinal direction of the absorbent is effective for enhancing the absorbability of body fluid such as menstrual blood. Absorber with increased absorption of bodily fluids by providing a protruding part containing a large amount of absorbent absorbs a lot of body fluid into the protruding part, and the surface side sheet of the protruding part gets wet, and the wearer It tends to give discomfort due to moisture. An object of the present invention is to provide an absorbent device that prevents leakage of bodily fluids such as menstrual blood and does not give a wearer a discomfort due to moisture.

The present invention comprises a surface side sheet having water permeability,
A water-absorbing layer that retains the body fluid absorbed through the front side sheet
A back side sheet having water impermeability;
Between the front side sheet and the back side sheet, an absorbent including a water guiding layer interposed in a state where at least a part is in contact with the water absorbing layer and the front side sheet,
An absorbent device characterized in that at least a part of the intermediate portion in the longitudinal direction of the surface side sheet is brought into contact with the water guide layer.

  According to the present invention, body fluid such as menstrual blood moves from at least a part of the longitudinal intermediate portion of the surface-side sheet to the water guide layer. Since body fluid such as menstrual blood is guided to a wide range of the water absorption layer by the water conveyance layer and absorbed in a short time, more water exists in the water absorption layer than in the vicinity of the surface. Therefore, the surface side sheet portion in contact with the skin is kept in a state where moisture does not stay and hardly remains, so that the wearer is hardly given discomfort due to moisture.

  Further, since the body fluid such as menstrual blood can be guided to the water absorbing layer by the water guiding layer, the absorption amount of the body fluid such as menstrual blood can be increased as compared with the conventional art. Further, since the amount of absorption can be increased, the water absorption layer can be formed with a smaller amount of absorbent material, and the absorber can be reduced in size, thickness, weight, and the like. Furthermore, even if it is folded, it does not become bulky as in the case where the protruding portion described in relation to the conventional technique is provided, and is convenient for transportation.

  The present invention is characterized in that at least a part of the intermediate portion in the longitudinal direction of the surface side sheet is recessed from the water guide layer to form a concave groove with respect to the surrounding region.

  According to the present invention, a concave groove is formed. Body fluid such as menstrual blood discharged from the wearer is temporarily stored in the groove. The stored body fluid is transmitted through the water guide layer from the side surface and the bottom of the groove and is absorbed by the water absorption layer. Furthermore, even if the supply speed of the liquid to be discharged is higher than the speed absorbed through the surface layer, it can be temporarily stored in the concave groove. Even if there is a difference between the supply rate and the absorption rate, it is acceptable. Therefore, body fluid leakage can be effectively prevented.

  Since a ditch | groove is formed in the longitudinal direction center part of an absorber, the peripheral part of the ditch | groove of a longitudinal direction center part will be in a movable state, and will become easy to shrink toward the center. Therefore, even a person with a narrow crotch width can be preferably used.

The present invention is characterized in that the water guiding layer is a diffusion water-absorbing sheet.
According to the present invention, the water conveyance layer can diffuse the body fluid absorbed through the surface side sheet over a wide range, and can send the body fluid to each part of the water absorption layer.

The present invention is characterized in that a water-absorbing polymer is interposed between the water-absorbing layers.
According to the present invention, the water-absorbing polymer interposed in the water-absorbing layer absorbs a lot of water, so that the absorption capacity is improved. Absorber can be thinned lightly.

  ADVANTAGE OF THE INVENTION According to this invention, the absorber which is excellent in absorption capability and hardly gives the wearer the discomfort by wetness can be provided. Moreover, since the absorption capability is excellent, a small, thin, and lightweight absorber can be provided. Therefore, since it does not bulk even if it folds, the absorber convenient for conveyance can be provided.

  According to the present invention, body fluid such as menstrual blood can be prevented from leaking from the absorbent device through the surface. Moreover, even if it is a person with a narrow crotch width, since the peripheral part of the longitudinal direction intermediate part of an absorber can be reduced in the width direction, it can be used conveniently.

  According to the present invention, the body fluid is absorbed by the water guide layer and diffused over a wide range, so that the body fluid can be sent to a wide range of the water absorption layer.

  According to the present invention, since the water-absorbing polymer absorbs a large amount of water, the ability to absorb body fluid such as menstrual blood is further improved. Absorber can be thinned lightly.

  Drawing 1 is a front view showing absorber 1 which is one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the section line AA of FIG.

  The absorbent device 1 includes a water-permeable surface-side sheet 2, a water-impermeable back-side sheet 5, a water-absorbing layer 3 interposed between the surface-side and the back-side sheet 5, the surface-side sheet 2 and the back-side sheet. 5 includes at least a part of the water-absorbing layer 3 and the water guide layer 4 interposed between the surface-side sheet 2 and the water-absorbing layer 4.

  The surface side sheet 2 is realized by, for example, a nonwoven fabric. When using the absorber 1, the surface side sheet | seat 2 is arrange | positioned on the side which contacts a wearer's skin directly. If the nonwoven fabric which has the touch close to underwear is used for the surface side sheet 2, the wearer can use the absorber 1 without a sense of incongruity.

  The water absorption layer 3 includes, for example, fluff pulp and a water absorption polymer. The water-absorbing polymer is made of, for example, sodium acrylate or potassium acrylate. The water absorption layer 3 can prevent leakage from the surface side sheet 2 by absorbing body fluid such as menstrual blood absorbed through the surface side sheet 2 and coagulating it into a gel. The absorption through the surface sheet 2 is not necessarily limited to the case where the body fluid that directly passes through the surface sheet 2 and reaches the water absorption layer 3 is absorbed, and passes through the water guide layer 4 through the surface sheet 2. Thus, a case where a bodily fluid such as menstrual blood that has reached the water absorbing layer 3 is absorbed is also included.

  The back surface side sheet 5 is realized by, for example, a thermoplastic synthetic resin such as polyethylene, and can prevent the liquid absorbed in the water absorbing layer 3 from leaking to the outside while the absorbent device 1 is used. .

  FIG. 3 is a cross-sectional view showing the flow of body fluid such as menstrual blood in the absorbent device 1 according to the embodiment of the present invention. The arrows in FIG. 3 schematically show the dispersion path of the liquid in which the body fluid stored in the recessed groove 6 spreads and is dispersed on both sides in the width direction by the water guide layer 4 or directly through the surface side sheet. The liquid in 6 is guided over substantially the entire surface of the water absorption layer 3 and is absorbed by the water absorption layer 3 in a short time.

  The water guide layer 4 can be realized by, for example, a diffusion water absorbent sheet. As a material for the diffusion water-absorbing sheet, for example, tissue made of a nonwoven fabric in which cellulose is hydrogen-bonded can be used. A part of the water guide layer 4 is in contact with the surface side sheet 2. The water guide layer 4 may be provided only in a portion in contact with the surface side sheet 2 and the periphery thereof, but preferably it is provided over substantially the entire surface of the water absorption layer 3 of the absorbent device 1. The water absorption layer 3 is present on the portion of the water guide layer 4 that is not in contact with the surface side sheet 2. Body fluid such as menstrual blood is guided to the water absorbing layer 3 by the water guiding layer 4. When a diffusion water-absorbing sheet is used as the water guide layer 4, body fluid such as menstrual blood is absorbed by the diffusion water-absorbing sheet and diffused to each part of the water guide layer 4. The water guide layer 4 has an absorption rate much higher than the absorption rate due to the capillary phenomenon in the water absorption layer 3. Body fluid such as menstrual blood that has penetrated and diffused into the water guiding layer 4 is diffused from the lower part of the water absorbing layer 3 toward the upper part and solidified in a gel form. There will be many. Therefore, since the surface side sheet 2 part in contact with the skin has almost no moisture, the wearer is hardly given any discomfort due to moisture.

  Since the body fluid such as menstrual blood can be distributed to each part of the water absorbing layer 3 by the action of the water guiding layer 4, the amount of absorbed body fluid such as menstrual blood can be increased as compared with the case where the water guiding layer 4 is not provided. Moreover, since the amount of absorption of body fluid is increasing, the water absorption layer 3 can be comprised with less absorption material, and size reduction, thickness reduction, and weight reduction of a body fluid absorptive article can be achieved.

  Furthermore, it does not become bulky as when the protruding portion described in the prior art is provided when folded, and is convenient for transportation and carrying.

  In the present embodiment, the outer shape of the absorbent device 1 is not particularly limited, but is preferably an elliptical bowl shape having a thin overall thickness and a narrow central portion in the longitudinal direction. Since the outer shape of the absorbent device 1 is constricted at the center in the longitudinal direction, the absorbent device 1 can be attached to the wearing shorts without greatly shifting the position of the absorbent device 1. In addition, the constriction of the central portion 24 in the longitudinal direction is formed in a concave shape that is retracted in a direction close to each other along the curvature of the base of both feet when worn between the crotch, and is attached to the shape of the crotch. The comfort is good and the generation of gaps due to wrinkles is prevented.

  The longest longitudinal length L1 from one end 20 to the other end 21 in the entire longitudinal direction is 18.6 cm, and the length L2 in the direction perpendicular to the longest longitudinal direction of the front region 22 in the smaller bowl shape is smaller. Is 8.4 cm, the length L3 in the direction perpendicular to the longest longitudinal direction of the rear region 23 having the larger bowl shape is 8.7 cm, and the direction perpendicular to the longitudinal direction of the region 24 in the middle in the longitudinal direction The shortest length L4 is 7.0 cm. The magnitude | size and shape of this invention are not limited to this magnitude | size, You may change a magnitude | size and a shape suitably.

  At least a part of the intermediate portion in the longitudinal direction of the surface side sheet 2 described above can be recessed from the water guide layer 4 to form the concave groove 6 with respect to the surrounding area.

  The concave groove 6 is not particularly limited, but more specifically, as an example, the longitudinal direction of the smaller front region 22 of the bowl shape on the central axis m passing through the center in the direction perpendicular to the longitudinal direction. 1 has a groove end 25 at a position 4.6 cm from one end 20, extending from the one end 25 toward the other end 26 in the longitudinal direction over a length L = 6.3 cm, perpendicular to the longitudinal direction, and in FIG. And a width W = 1.0 cm in a direction parallel to the surface on the front side, and a depth H = 3 mm in a direction perpendicular to the longitudinal direction and perpendicular to the surface. 23 from the other end 21 to the one end 20 side with an interval of 7.7 cm.

  The position of the groove 6 is not particularly limited, but the groove 6 is on the longitudinal center axis m of the absorbent device 1 from the longitudinal end 1 of the absorbent device 1 to 1 of the entire length L1. One end 25 of the groove 6 is preferably formed at the position of / 4. The length L of the concave groove 6 is preferably about 1/3 of the entire length L1.

  The length L in the longitudinal direction of the concave groove 6 is not particularly limited, but is preferably 4.0 cm to 12.0 cm. When the length L in the longitudinal direction of the concave groove 6 is less than 4.0 cm, the concave groove 6 may be removed from the excretion site due to a positional shift of the absorbent device 1 or an individual difference in the optimal wearing position. When the length L in the longitudinal direction of the concave groove 6 is 12.0 cm or more, the fit property is lowered, which is not preferable.

  The width W of the concave groove 6 is not particularly limited, but is preferably 0.3 cm or more and 2.5 cm or less. Furthermore, it is preferably more than 0.7 cm and less than 1.3 cm. If it is less than 0.3 cm, the blood drainage part is likely to be displaced from the groove 6 because of its narrowness, and is not practical. Even at 0.7 cm or less, there is a possibility that the blood drainage part is displaced from the groove 6 and a sufficient body fluid inflow region may not be ensured. If it exceeds 1.3 cm, the rigidity of the absorbent device 1 is increased and the fitting property is likely to be lowered. When it exceeds 2.5 cm, the contact width to the skin on both sides is reduced, and body fluid such as menstrual blood tends to leak to the outside.

  The depth H of the concave groove 6 is not particularly limited, but is preferably 2 mm or more and 15 mm or less, more preferably 2 mm or more and 5 mm or less. When the depth H of the concave groove is less than 2 mm, a sufficient body fluid inflow region is not ensured. When the depth H of the concave groove 6 exceeds 5 mm, the thickness of the absorbent device 1 may be increased and the attachment comfort may be deteriorated. When the depth H of the concave groove 6 exceeds 15 mm, there may be a problem that the surface side sheet 2 may be broken by stretching.

  Moreover, although the both ends of the longitudinal direction of the ditch | groove 6 are not specifically limited, It is preferable to set it as the roundish shape. This is to give the skin a soft feel.

  By providing the groove 6 with an appropriate shape at an appropriate position, even if the supply speed of bodily fluids such as menstrual blood discharged from the body is higher than the speed of absorption through the surface-side sheet 2, Therefore, it can be stored in the concave groove 6 of the absorber 1. In addition, menstrual blood coagulates in a short time and tends to rapidly increase in viscosity. Therefore, once stored in the concave groove 6, it is difficult to leak outside the absorbent device 1. For this reason, even if there is a difference between the supply rate and the absorption rate temporarily, it is allowed. Furthermore, if a small amount of menstrual fluid such as menstrual blood overflows from the groove 6, body fluid such as menstrual blood is directly absorbed into the water absorbing layer 3 from the surface side sheet 2 around the groove 6. Therefore, body fluid such as menstrual blood can be prevented from leaking from the absorbent device 1.

  Since the groove 6 that is long in the longitudinal direction is provided in the longitudinal intermediate portion of the absorbent device 1, the peripheral portion of the groove 6 becomes movable and easily contracts toward the center. Therefore, even a person with a narrow crotch width can be preferably used.

  The front side sheet 2 having water permeability and the back side sheet 5 having water impermeability have substantially the same size, and the peripheral portions thereof are formed by applying a hot melt adhesive and performing heat and pressure welding. They are fixed to each other.

  The absorbent device 1 according to one embodiment of the present invention can be manufactured by a method similar to a known method for manufacturing an absorbent device. For example, the diffusion water-absorbing sheet that is the water guide layer 4 is placed on the back surface side sheet 5 at an appropriate position. On the diffusion water-absorbing sheet, an absorbent sheet which is a water-absorbing layer in which a portion to be the groove 6 is hollowed is placed at an appropriate position. A hot melt adhesive is applied on the inner peripheral portion of the portion to be the outer shape portion of the back surface side sheet 5 and the portion to be the bottom portion of the concave groove 6 of the diffusion water absorbent sheet. The front side sheet 2 is placed thereon and heated and pressure-bonded with a roll having a mold in which the unevenness is reversed, and the outer peripheral part and the concave groove 6 part are bonded respectively. Then, it cuts and forms an external shape.

  FIG. 4 is a cross-sectional view of an absorbent device 1a according to another embodiment of the present invention. Note that portions corresponding to those in the above-described embodiment are denoted by the same reference numerals. The arrows in FIG. 4 schematically show the dispersion path of the liquid in which the body fluid stored in the recessed groove 6 spreads and is dispersed on both sides in the width direction by the water guide layer 4 or directly through the surface side sheet. The body fluid in 6 is guided over substantially the entire surface of the water guiding layer 4 and is absorbed by the water absorbing layers 3 and 3a in a short time.

  The absorbent device 1a of this embodiment includes a water-permeable surface side sheet 2, a water absorbing layer 3 that retains body fluid absorbed through the surface side sheet 2, a water impermeable back surface sheet 5, and a water absorbing material. It is comprised by the water conveyance layer 4 interposed between the layer 3 and the back surface side sheet | seat 5, and the water absorption layer 3a interposed between the water conveyance layer 4 and the back surface side sheet | seat 5. FIG. The concave groove 6 can be provided in the same manner as in the above-described embodiment. These materials can be the same as those in the above-described embodiment. In the absorbent device 1a of this embodiment, since the second water absorbing layer 3a is further provided below the water guiding layer 4, more body fluid such as menstrual blood can be absorbed.

  FIG. 5 is a cross-sectional view of an absorber 1b according to still another embodiment of the present invention. Note that portions corresponding to those in the above-described embodiment are denoted by the same reference numerals. The arrows in FIG. 5 schematically show the dispersion path of the liquid in which the body fluid stored in the groove 6 is dispersed by the water guide layer 4 or directly through the surface side sheet 2, and the body fluid in the groove 6 is Then, it is guided over substantially the entire water-conducting layer 4 and absorbed by the water-absorbing layer 3 in a short time.

  The absorbent device 1b of this embodiment has a water-permeable layer having a water-permeable surface-side sheet 2, a water-absorbing layer 3 that holds body fluid absorbed through the surface-side sheet 2, and a surface in contact with the surface-side sheet 2. 3 includes a water guide layer 4 surrounded by 3 and a back side sheet 5 having water impermeability. These materials can be the same as those in the above-described embodiment. The water guide layer 4 is indicated by arrows directed to the left and right in FIG. 5 by the surface side sheet 2 having a width smaller than that of the water guide layer 4 of the above-described embodiment interposed between both ends in the width direction of the water absorption layer 3. As shown, the body fluid can be dispersed from both sides of the water guiding layer 4 to the water absorbing layer 3 and absorbed by the water absorbing layer 3. The structure of the water-conducting layer 4 and the water-absorbing layer 3 of the absorber 1b is such that, for example, the water-conducting layer 4 is placed on the water-absorbing layer 3, and the water-absorbing layer 3 around the water-conducting layer 4 is folded and covered. This can be achieved. The shape of the back-side sheet 5 having water impermeability is not particularly limited and may be flat, but the surface corresponds to the thickness of the water absorbing material between the water guide layer 4 and the back-side sheet 5. By inflating in the direction from the side sheet 2 to the back side sheet 5, the absorption amount of the body fluid dispersed downward from the water guide layer can be increased. In the absorbent 1b of this embodiment, since the water guide layer 4 is surrounded by the water absorbing layer 3, more body fluid such as menstrual blood can be absorbed.

  The absorbers 1, 1a, 1b of each embodiment may be used as they are. However, in still another embodiment of the present invention, a wing portion for preventing side leakage is integrated with these absorbers 1, 1a. It may be realized as a formed sanitary napkin. In these cases, the B direction is used as the front and the C direction is used as the rear.

  The absorbers 1, 1a, 1b of the present embodiment can be applied to, for example, sanitary pads, feminine hygiene pads such as panty liners, and urinary incontinence pads.

It is a front view which shows the absorber 1 which is one Embodiment of this invention. It is sectional drawing seen from the cut surface line AA of FIG. It is sectional drawing which shows the flow of bodily fluids, such as menstrual blood, in the absorber 1 of embodiment of this invention. It is sectional drawing of the absorber 1a of other embodiment of this invention. It is sectional drawing of the absorber 1b of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b Absorber 2 Front surface sheet 3, 3a Water absorption layer 4 Water transfer layer 5 Back surface sheet 6 Groove 20 Absorber one end 21 Absorber other end 22 Front region 23 Rear region 24 Longitudinal middle 25 One end of the groove 26 The other end of the groove

Claims (4)

A surface side sheet having water permeability;
A water-absorbing layer that retains the body fluid absorbed through the front side sheet
A back side sheet having water impermeability;
Between the front side sheet and the back side sheet, an absorbent including a water guide layer interposed in a state where at least a part is in contact with the water absorbing layer and the front side sheet,
An absorbent device, wherein at least a part of a middle portion in the longitudinal direction of the surface side sheet is brought into contact with a water guide layer.   The absorbent device according to claim 1, wherein at least a part of the middle portion in the longitudinal direction of the surface side sheet is recessed from the water guide layer to form a concave groove with respect to a surrounding region.   The absorbent according to claim 1 or 2, wherein the water guiding layer is a diffusion water-absorbing sheet.   The absorbent device according to any one of claims 1 to 3, wherein a water-absorbing polymer is interposed between the water-absorbing layers.

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