JP4275521B2 - Panty liner - Google Patents

Description

  The present invention relates to a panty liner that is thin and soft and can give a sense of unity with an undergarment, and more particularly, to a panty liner that can exhibit a function of drawing liquid quickly without being liable to diffuse on the skin side surface.

  The panty liner is used by a woman by adhering it to the inside of the crotch portion of the underwear on a day other than menstruation day, and is used to absorb vaginal secretions such as cages. The panty liner is desired to be thin and soft so as to give a sense of unity with the underwear, and to have the ability to retain fluid such as vaginal secretions and to prevent the fluid from diffusing on the skin side surface.

The panty liner described in Patent Document 1 below has a structure in which the skin side surface of the absorbent material is covered with a surface material. The absorbent material is a hydrophilic non-woven fabric formed of composite synthetic fibers with a basis weight of about 40 g / m ² . The surface material is 100% cotton fiber and is a nonwoven fabric formed by a water jet manufacturing method, and is thinner than the absorbent material. The panty liner absorbs and holds the liquid in the absorbent material, and the surface material is not thick enough to hold the liquid, but functions as a liquid that permeates the absorbent material. Therefore, a large number of liquid permeation holes for guiding the liquid toward the absorbent material are formed in the surface material.

In the panty liner described in Patent Document 2 below, a single nonwoven fabric sheet is located on the skin side and a liquid-impermeable barrier layer is provided on the clothing side. The nonwoven fabric sheet is obtained by forming a web in which rayon fibers and polyester fibers are blended by a card method, and entangled the fibers by a water flow sprayed from a nozzle. Further, by applying the water flow, the fibers on the surface of the nonwoven fabric sheet are moved in the lateral direction to form a dent. Further, a binder solution is applied to the non-woven fabric sheet, the fibers are joined together, the shape of the recess is maintained, and the elastic recovery function during compression is enhanced.
JP-A-8-24289 JP-A-7-138865

  As described in Patent Document 1, the conventional panty liner has a dense fiber density on the skin side surface by covering the surface of the absorbent material with a surface material, and is torn to the skin side surface when liquid is given. Etc. are less likely to occur. Further, a liquid permeable hole is formed in the surface material, and the liquid given to the surface material is guided from the liquid permeable hole to the absorbent material below the liquid permeable hole.

  However, in the structure in which the absorbent material is covered with the surface material, it is difficult to quickly guide the liquid such as vaginal secretions given to the surface material to the absorbent material, and the liquid tends to stay on the surface material. When the area ratio of the liquid permeation holes formed in the surface material is increased in order to promptly guide the liquid applied to the surface material to the absorbent material, the liquid absorbed and held in the absorbent material is absorbed by the body pressure. It tends to ooze out.

  Moreover, in the thing of the said patent document 1, in order to improve elastic return property, an absorber is formed with a composite synthetic fiber, and a surface material is formed with 100% of cotton fiber so that the contact feeling to skin may become favorable. ing. Therefore, the hydrophilicity of the surface material becomes higher than that of the absorbent material, and it is difficult to quickly guide the liquid applied to the surface of the surface material to the absorbent material.

  Next, the panty liner described in Patent Document 2 is intended to be manufactured at a low cost as a sanitary article that is frequently replaced by positioning a nonwoven sheet, which is a single sheet, on the skin side.

  However, the nonwoven fabric sheet has a uniform distribution of the mixing ratio of rayon fiber and polyester fiber in the interior thereof, and does not form a gradient of hydrophilicity inside the nonwoven fabric sheet, the liquid given to the nonwoven fabric sheet, There is no consideration for promptly pulling into the nonwoven fabric sheet. Therefore, the skin side surface is easily kept wet by the liquid, and it is difficult to give a dry feeling to the skin.

  Therefore, in the one described in Patent Document 2, a depression is formed on the skin side surface of the nonwoven fabric sheet, and the liquid given to the nonwoven fabric sheet is retained inside the depression, thereby improving the comfort at the time of wearing. I am trying to do. However, since the nonwoven fabric sheet forms the depression by moving the fibers located on the skin side surface in the lateral direction by the force of water flow, the nonwoven fabric sheet has fibers around the depression on the skin side surface of the nonwoven fabric sheet. The density of is high. Therefore, the liquid given to the non-woven sheet tends to concentrate and remain around the depression, and it is difficult to give a feeling of moisture to the skin of the body and to obtain comfort during wearing.

  Moreover, the thing of patent document 2 contains the binder in order to maintain the shape of the said nonwoven fabric sheet and to obtain elastic return property. However, it is not preferable to include a binder in a nonwoven fabric sheet that directly contacts the periphery of a woman's vagina in terms of skin irritation and skin safety. Moreover, since the panty liner formed of the nonwoven fabric sheet containing the binder has higher rigidity than the cloth underwear, it is difficult for the wearer to obtain a feeling of wearing that is integrated with the underwear.

  The present invention solves the above-described conventional problems, and is a structure in which a non-woven fabric having a liquid holding function is in direct contact with the body, and is excellent in the drawability of the liquid into the non-woven fabric, and the liquid stays on the skin side surface. It is an object of the present invention to provide a panty liner that is difficult to wear and has excellent comfort when worn, and that can be formed into a soft overall shape to give a sense of unity with the underwear.

The present invention is a panty liner having a liquid holding sheet and a back sheet stacked on the clothing side of the liquid holding sheet,
The liquid holding sheet is composed of two non-woven fabrics bonded to each other, and each of the non-woven fabrics does not include a bonding agent for bonding the fibers, and the fibers are entangled with each other , and the first non-woven fabric appears on the skin side surface. Is formed of hydrophilic fibers and hydrophobic or weakly hydrophilic synthetic resin fibers, and the second nonwoven fabric located on the clothing side is formed of at least hydrophilic fibers, and the second nonwoven fabric is more than the first nonwoven fabric. The water absorption of Klem is high, the difference is 10 mm or more,
The hydrophilicity of the second nonwoven fabric is higher than that of the first nonwoven fabric .

  This panty liner has a basic configuration of a liquid holding sheet and a back sheet formed of a nonwoven fabric having a liquid holding function, and the nonwoven fabric having the liquid holding function appears on the skin side surface. Therefore, the surface sheet (top sheet) which demonstrates only the liquid permeation function as in the prior art is not provided. The liquid secreted from the female vagina is not directly permeated through the surface sheet as in the prior art, but is directly held by the nonwoven fabric, so that the liquid is quickly absorbed and retained. And since the liquid holding sheet formed with the said nonwoven fabric has a hydrophilic gradient which becomes hydrophilicity toward a back surface sheet, the liquid given to the skin side surface in the nonwoven fabric which forms a liquid holding sheet Quickly absorbed. Further, since the liquid hardly remains on the surface of the nonwoven fabric located on the skin side surface, it is difficult to give the wearer's skin a feeling of stickiness and is excellent in comfort at the time of wearing.

  Moreover, since the said nonwoven fabric does not contain a binder, there is no irritation | stimulation to skin and it is safe with respect to a wearer's skin. In addition, since the liquid holding sheet is low in rigidity and soft because it does not contain a binder, it is easy to give a feeling of wearing integrated with the underwear. In addition, since the hydrophilic fibers and the synthetic resin fibers are entangled on the skin side surface, the nonwoven fabric is less likely to be wrinkled or sag on the skin side surface and is easy to maintain the surface shape.

In the present invention , the first nonwoven fabric exhibits the function of preventing the skin side surface of the panty liner from curling and sagging, and the second nonwoven fabric exhibits the function of absorbing and holding the liquid.

Further, the present invention is a panty liner having a liquid holding sheet and a back sheet stacked on the clothing side of the liquid holding sheet,
The liquid holding sheet is formed by joining a first nonwoven fabric appearing on the skin side surface and a second nonwoven fabric located on the clothing side, and the first nonwoven fabric and the second nonwoven fabric join fibers to each other. It is a nonwoven fabric in which fibers are entangled without containing a bonding agent,
In the first nonwoven fabric, the skin side surface is formed of hydrophilic fibers and hydrophobic or weakly hydrophilic synthetic resin fibers, and the clothing side surface is formed of at least hydrophilic fibers. The layer appearing on the clothing side surface is higher than the layer appearing on the side surface,
The second nonwoven is formed of at least hydrophilic fibers are those hydrophilicity is characterized by higher than the layer appearing on the garment surface of the first nonwoven fabric.

  In this case, preferably, the Klem water absorption of the first nonwoven fabric is higher in the layer appearing on the clothing side surface than the layer appearing on the skin side surface, and the difference is 10 mm or more. The second nonwoven fabric has a Klem water absorption higher than that of the layer appearing on the clothing side surface of the first nonwoven fabric, and the difference is 10 mm or more.

  Also in this case, the first nonwoven fabric forms an upper fiber web containing the hydrophilic fiber and a hydrophobic or weakly hydrophilic synthetic resin fiber on a lower fiber web having hydrophilic fibers, and the both fiber webs. The fibers can be formed by entanglement together.

  Thus, when the hydrophilicity gradient is formed in the first nonwoven fabric and the hydrophilicity of the second nonwoven fabric located therebelow is increased, the ability of the liquid applied to the skin-side surface is increased, and second The liquid holding capacity can be increased by holding the liquid in the nonwoven fabric.

In this case, the basis weight of the first nonwoven fabric is 25 to 50 g / m ^2, the basis weight of the second nonwoven fabric is preferably 20 to 60 g / m ^2.

  In the present invention, the Gurley rigidity value in a state where the liquid holding sheet and the back sheet are overlapped and joined to each other is 0.7 mN or less.

  When the Gurley rigidity value is less than or equal to the above value, the wearer becomes soft, and the wearer can obtain a feeling of wear integrated with the underwear.

  Moreover, the thickness dimension in the state which the said liquid holding sheet | seat and the said back surface sheet were piled up and were mutually joined is 1 mm or less.

  Since the basic structure of the panty liner of the present invention is formed by a nonwoven fabric functioning as a liquid holding sheet and a back sheet, it can be thinned and can be configured as 1 mm or less.

  Since the panty liner of the present invention does not use a surface sheet for liquid permeation, a non-woven fabric having a liquid holding function appears on the skin side surface, and the non-woven fabric is provided with a gradient of hydrophilicity. The liquid given to the skin side surface can be quickly drawn into the inside, and the liquid hardly stays on the skin side surface. Moreover, it can be made thin and soft, and a feeling of wearing with the underwear can be obtained. Furthermore, the number of components can be reduced, and mass production is possible at low cost.

1 is a plan view of a panty liner 1 viewed from the skin side surface as a reference example , FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. It is the expanded sectional view which showed the absorption function typically.

  The panty liner 1 shown in FIG. 1 has a vertically long shape in which the vertical dimension in the direction along the vertical center line Oy is longer than the horizontal dimension in the direction orthogonal to the vertical dimension. The front edge portion 1a and the rear edge portion 1b have a curved shape that is convex toward the front and the rear, and the right edge portion 1c and the left edge portion 1d have a curved shape that is concave toward the lateral direction.

An embossed portion 2 is formed inside the front edge portion 1a, the rear edge portion 1b, and the left and right side edge portions 1c and 1d. The embossed portion 2 is heated and compressed from the skin side surface to form a concave shape. In this reference example , the embossed portion 2 represents a pattern of a predetermined pattern.

  As shown in FIG. 2, the main body portion 10 of the panty liner 1 includes a liquid holding sheet 11 formed of a single nonwoven fabric, a back sheet 12 stacked on the liquid holding sheet 11, and the surface of the back sheet 12. And a pressure-sensitive adhesive layer 13 formed on the surface. And the release sheet 20 is piled up and bonded to the back surface of the main body part 10, and the pressure-sensitive adhesive layer 13 is protected.

  The body 10 of the panty liner 1 has a skin side surface 3 on the side of the woman's crotch that contacts the vaginal opening and its periphery, and a clothing side surface 4 on the opposite side. In the main body 10, the liquid holding sheet 11 appears on the skin side surface 3, and the back sheet 12 and the pressure sensitive adhesive layer 13 appear on the clothing side surface 4. Moreover, in the said embossed part 2, the said liquid holding sheet 11 is pressurized from the skin side surface 3, is heated, and is formed in the concave shape.

  As shown in FIG. 3, the upper layer 15 and the lower layer 16 are different in the fiber composition of one nonwoven fabric forming the liquid holding sheet 11. The upper layer 15 is composed of hydrophilic fibers and hydrophobic or weakly hydrophilic synthetic resin fibers. The lower layer 16 includes hydrophilic fibers, and is preferably formed of only hydrophilic fibers.

  The hydrophilic fiber in this specification means a fiber having an official moisture content of 3% or more, preferably 5% or more. The hydrophobic fiber means that the official moisture content is 0%, and the weakly hydrophilic fiber means that the official moisture content is less than 3% and not 0%. The official moisture content is the ratio (moisture content) of the mass of moisture adsorbed on the fiber to the mass of the fiber when left in an atmosphere at 20 ° C. and a relative humidity of 65%.

  Hereinafter, the respective fibers and their official moisture content will be exemplified. Below, the said official moisture content is described in% in () at the end of each fiber name.

(Hydrophilic fiber)
Cotton (8.5%), pulp (8.5%), hemp (12%)
Silk, an animal fiber (12%)
Recycled fiber rayon (11%), cupra (11%), polynosic rayon (11%)
Acetate, a semi-synthetic fiber (6.5%)
Synthetic resin fibers such as polyamide-based (for example, nylon (4.5%)), polyvinyl alcohol-based (for example, vinylon (5%)), and the like, having a hydroxyl group, amino group, carboxyl group hydrophilic group,
In addition, synthetic resin fibers formed of PP (polypropylene), PE (polyethylene), PET (polyethylene terephthalate), etc., which are coated or kneaded with a hydrophilic agent such as a surfactant, or the surface is uneven or A porous shape with increased moisture retention capacity,

(Hydrophobic fiber)
PP (0%), PE (0%) not hydrophilized,

(Weakly hydrophilic fiber)
Unhydrophilized PET (0.4%), acrylic (2%)
In the liquid holding sheet 11 of the reference example , the upper layer fiber web forming the upper layer 15 is stacked on the lower layer fiber web forming the lower layer 16, and the water jet from the upper layer fiber web side to the thus laminated fiber web. The fibers of the upper layer fiber web, the fibers of the lower layer fiber web, and the fibers of the upper layer fiber web and the fibers of the lower layer fiber web are entangled into a single nonwoven fabric. Moreover, the said liquid holding sheet 11 is maintaining the sheet | seat shape by the entanglement between fibers, and the binder (binder) which adhere | attaches fibers is not used.

For example, the lower fiber web is formed of 60% by mass of rayon and 40% by mass of durable hydrophilic PET and has a basis weight of 40 g / m ^{2. The} upper fiber web is made of 70% by mass of cotton and 30% by mass of weakly hydrophilic PET. The basis weight formed is 20 g / m ² .

  The liquid holding sheet 11 shown in FIG. 3 is a two-layer spunlace nonwoven fabric produced as described above, and the boundary between the upper layer 15 and the lower layer 16 is not necessarily clear. The upper layer 15 located in the vicinity thereof is formed of cotton and PET which are hydrophilic fibers, and the lower surface 16 located on the clothing side surface and in the vicinity thereof is formed only of rayon and durable hydrophilic PET, that is, hydrophilic fibers. Is done. Therefore, the lower layer 16 is more hydrophilic than the upper layer 15. That is, the liquid holding sheet 11 has a higher water absorption of the lower layer 16 than the upper layer 15.

  The respective Krem water absorptions in the upper layer 15 and the lower layer 16 are determined by performing tests on the liquid holding sheet 11 and measuring the suction heights of the respective test liquids on the skin side surface and the clothing side surface. Obtainable. Alternatively, only the upper fiber web is subjected to water jet treatment under the same conditions as those for forming the liquid holding sheet 11 to form only the upper layer 15 alone, and similarly, only the lower layer 16 is formed alone. In addition, the Klem water absorption of each layer may be measured individually.

As described above, the nonwoven fabric with a basis weight of 40 g / m ² formed of rayon 60% by mass and durable hydrophilic PET 40% by mass has a Klem water absorption of 80 mm, cotton 70% by mass and weakly hydrophilic PET 30% by mass. The formed nonwoven fabric with a weight per unit area of 20 g / m ^{2 has} a water absorption of Klem of 69 mm.

  In the liquid holding sheet 11, the upper layer 15 and the lower layer 16 have different hydrophilicity, that is, the water absorption of Klem, but if the difference is less than 10 mm, the gradient of hydrophilicity from the upper layer 15 to the lower layer 16 becomes gentle. Thus, it becomes difficult to quickly draw the liquid applied to the skin side surface toward the lower layer 16. On the other hand, if the difference in water absorption between Krems exceeds 100 mm, the hydrophilicity of the upper layer 15 is too low, and the speed of sucking the liquid from the upper layer 15 into the lower layer 16 decreases.

  Since the skin-side surface and the upper layer 15 of the liquid-holding sheet 11 contain hydrophobic or weakly hydrophilic synthetic resin fibers, the wet-strength of the skin-side surface is maintained when the liquid-holding sheet 11 holds the liquid. It is easy to tear and the skin side surface is not easily broken. For this purpose, it is preferable that the upper layer 15 (the upper fiber web for forming the upper layer 15) contains 20% by mass or more of the synthetic resin fiber. Further, in order to prevent the hydrophilicity of the upper layer 15 from being extremely lowered with respect to the lower layer 16, the synthetic resin fibers in the upper layer 15 are preferably contained in an amount of 85 mass% or less.

The lower layer 16 of the liquid holding sheet 11 is preferably formed of only hydrophilic fibers, but the lower layer 16 includes synthetic resin fibers such as durable hydrophilic PET as in the reference example . Is preferred. When this hydrophilic synthetic resin fiber is included, when the liquid is absorbed and held, the lower layer 16 is less likely to bend and sag, and a space for holding the liquid is secured between the fibers constituting the lower layer 16. It becomes easy to do. Therefore, the lower layer 16 preferably contains 20% by mass or more of the synthetic resin fiber. However, if there are too many synthetic resin fibers, the rigidity of the panty liner 1 will be too high, and the sense of unity with the underwear will be impaired. Therefore, the upper limit of the synthetic resin fiber contained in the lower layer 16 is 60% by mass.

The panty liner 1 has a basic structure composed of a liquid holding sheet 11 and a back sheet 12 formed of a single nonwoven fabric. The upper layer 15 of the liquid holding sheet 11 maintains surface strength, and the lower layer 16 Exhibits absorption and retention of liquid. Therefore, the basis weight of the liquid holding sheet 11 is set to 50 g / m ² or more and less than 120 g / m ² . If it is less than 50 g / m ² , sufficient liquid holding ability cannot be exhibited. _{On the other hand} , if it exceeds 120 g / m ₂ , the panty liner becomes thick and the rigidity becomes so high that it is impossible to obtain a sense of unity with the crotch portion of the underwear.

  In the liquid holding sheet 11, it is preferable that the lower layer 16 has a larger basis weight than the upper layer 15 because the lower layer 16 functions to absorb and hold the liquid.

As described above, the processing energy per water jet required to form the liquid holding sheet 11 having a basis weight of 50 g / m ² or more is 0.09 to 0.5 (kw / m ² ). The number of treatments is preferably 1 or more and 8 or less. The processing energy (kw / m ² ) is obtained by {1.63 × injection pressure (kgf / cm ² ) × injection flow rate (m ³ / min)} ÷ processing speed (m / min).

The opening diameter of the water jet nozzle is 70 to 120 μm, and the arrangement pitch on the CD is 0.3 to 2.0 mm. For example, the total processing energy is set to 1.56 (kw / m ² ) by processing 6 times with a processing energy of 0.26 (kw / m ² ) per time.

By setting the treatment energy per time within the above range, fibers of a relatively thick fiber web of 120 g / m ² at 50 g / m ² or more can be reliably entangled, and when the skin side surface is wet. The surface strength can be maintained.

  The back sheet 12 is formed of a polyethylene film or a composite nonwoven fabric in which a spunbond nonwoven fabric (S) and a meltblown nonwoven fabric (M) are laminated and joined in the order of S / M / S. The back sheet 12 is preferably a breathable sheet.

The liquid holding sheet 11 and the back sheet 12 are bonded by a hot melt adhesive. In order not to impair the flexibility of the panty liner 1, the coating amount of the hot melt adhesive is preferably 5 to 30 g / m ² .

  In a state where the liquid holding sheet 11 and the back sheet 12 are laminated and bonded, the total thickness dimension is 1 mm or less. The Gurley rigidity values in the vertical direction and the horizontal direction are both 0.7 mN or less. When the thickness is 1 mm or less and the Gurley rigidity value is 0.7 mN or less, when used by adhering to the crotch portion of the underwear, deformation of the underwear is not impaired, and a sense of unity with the underwear can be obtained. it can.

  The pressure-sensitive adhesive layer 13 is formed in a stripe shape so as to extend parallel to the vertical direction on the surface of the back sheet 12. The pressure-sensitive adhesive layer 13 may be formed in any pattern as long as the panty liner 1 can be fixed without being displaced with respect to the inner surface of the crotch portion of the underwear, for example, a stripe extending in parallel in the lateral direction. The shape may be sufficient and what was apply | coated to the front surface of the surface of the back surface sheet 12 may be sufficient. When the back sheet 12 is formed of a breathable resin film or the like, a stripe pattern is preferably used so as not to impair the breathability. Further, the release sheet 20 is used in which a release agent is applied to the surface of a paper material.

  The panty liner 1 is attached to the inner surface of the crotch portion of the underwear through the pressure sensitive adhesive layer 13. Since this panty liner 11 has a basic structure only with the liquid holding sheet 11 and the back sheet 12, it can be easily manufactured and mass-produced at low cost. In addition, since the thickness is 1 mm or less and the Gurley rigidity value is 0.7 mN or less, it can be deformed following the crotch portion of the underwear, and the wearer may feel that the panty liner 1 is part of the crotch portion of the underwear. it can.

  The liquid holding sheet 11 having the function of absorbing and holding liquid directly hits a woman's vaginal opening and its periphery, and vaginal excretion and the like are directly applied to the skin side surface of the liquid holding sheet 11. In the structure where the surface of the absorbent material is covered with a thin surface material as in the past, the liquid given to the skin side surface penetrates the surface material and is guided to the absorbent material, so that the liquid absorption speed is increased. There is a limit. However, the panty liner 1 can accelerate the absorption of the liquid because the liquid is directly applied to the liquid holding sheet 11 without passing through the surface material.

  Moreover, since the liquid holding sheet 11 does not contain a binder, the binder does not interfere with the migration of the liquid between the fibers. Further, since the lower layer 16 has a higher hydrophilicity than the upper layer 15, as schematically shown in FIG. 3, the liquid 25 quickly permeates the upper layer 15 and is drawn into the lower layer 16. It diffuses and is held in the lower layer 16. Due to the gradient of the hydrophilicity between the upper layer 15 and the lower layer 16, the liquid 25 is absorbed quickly, and the liquid does not easily remain in the upper layer 15. Therefore, the skin-side surface is less likely to be sticky to the skin, and a comfortable feeling when worn is obtained. be able to.

  Moreover, since the liquid holding sheet 11 that directly contacts the skin does not contain a binder, it is safe for the skin.

FIG. 4 is a cross-sectional view showing the panty liner 30 according to the first embodiment of the present invention, and FIG. 5 is an enlarged cross-sectional view showing an enlarged configuration of the panty liner 30 and schematically showing a liquid absorbing function. FIG.

The shape of the panty liner 30 is the same as the reference example shown in FIG. The main body 40 is formed of the liquid holding sheet 31, the back sheet 12, and the pressure sensitive adhesive layer 13. The illustration of the release sheet 20 is omitted. The back sheet 12, the pressure sensitive adhesive layer 13, and the release sheet 20 are the same as those in the above reference example .

The liquid holding sheet 31 of the panty liner 30 is composed of a first nonwoven fabric 32 and a second nonwoven fabric 33, the first nonwoven fabric 32 appears on the skin side surface 3, and the second nonwoven fabric 33 is located on the clothing side. . The first nonwoven fabric 32 and the second nonwoven fabric 33 are bonded via a hot melt adhesive. The application amount of the hot melt adhesive is 5 to 30 g / m ² so as not to prevent the liquid from passing from the first nonwoven fabric 32 to the second nonwoven fabric 33 and not to disturb the soft texture of the entire panty liner 30. Set within range. Moreover, the application amount of the hot-melt adhesive that bonds the second nonwoven fabric 33 and the back sheet 12 is the same.

  The panty liner 30 has a thickness of 1 mm or less and a Gurley rigidity value of 0.7 mN or less in both the vertical direction and the horizontal direction.

  The first nonwoven fabric 32 is formed of hydrophilic fibers and hydrophobic or weakly hydrophilic synthetic resin fibers. The second nonwoven fabric 33 is formed of only hydrophilic fibers. In order to maintain the surface strength on the skin side surface 3 of the panty liner 30, the first nonwoven fabric 32 preferably contains 20 to 85 mass% of the synthetic resin fiber. The 2nd nonwoven fabric 33 may be formed only with the vegetable fiber and the reproduction | regeneration fiber, and the hydrophilic synthetic resin fiber may be contained in the range which the rigidity of the whole panty liner 30 does not become high.

In this embodiment, the first nonwoven fabric 32 is a spunlace nonwoven fabric containing 70% by mass of cotton and 30% by mass of weakly hydrophilic PET and having a basis weight of 30 g / m ² . The processing energy by the water jet is 0.16 (kw / m ² ) per one, and one that has been processed six times is used. The total processing energy is 0.96 (kw / m ² ).

The second nonwoven fabric 33 is a spunlace nonwoven fabric with 100% rayon fibers and a basis weight of 25 g / m ² . The processing energy by the water jet is 0.16 (kw / m ² ) per time, and the one that has been processed three times is used. The total processing energy is 0.48 (kw / m ² ).

  By increasing the processing energy of the first nonwoven fabric 32, the fiber entanglement in the first nonwoven fabric 32 can be increased, and the surface strength of the skin-side surface 3 when wet can be increased. On the other hand, by making the processing energy of the second nonwoven fabric 33 lower than that of the first nonwoven fabric 32, it becomes possible to secure a gap for holding the liquid between the fibers in the second nonwoven fabric 33, and the liquid absorption capacity is increased. It can be secured.

The Krem water absorption is higher in the second nonwoven fabric than in the first nonwoven fabric, and the difference is 10 mm or more. In this embodiment, since the liquid holding sheet 31 is not a two-layer spunlace nonwoven fabric as in the reference example , but is formed by joining different nonwoven fabrics 32 and 33, the interface between the first nonwoven fabric 32 and the second nonwoven fabric 33 is formed. More preferably, the difference in water absorption by the Klem is 20 mm or more so that the liquid can permeate quickly. In the said embodiment, the Krem water absorption of the 1st nonwoven fabric 32 is 69 mm, the Krem water absorption of the 2nd nonwoven fabric 33 is 113 mm, and the difference is 40 mm or more. The upper limit is 100 mm.

The basis weight of the first nonwoven fabric 32 is 25 to 50 g / m ² . If it is less than the above range, the wet strength on the skin side surface cannot be increased, and if it exceeds the above range, the liquid given to the skin side surface 3 tends to stay in the first nonwoven fabric 32, and the second nonwoven fabric 33. Will not penetrate quickly. The basis weight of the second nonwoven fabric 33 is 20 to 60 g / m ² . When it is less than the above range, a sufficient liquid holding capacity cannot be secured, and when it exceeds the above range, the rigidity of the panty liner 30 becomes high.

The total basis weight of the liquid holding sheet 31 composed of the first nonwoven fabric 32 and the second nonwoven fabric 33 is 45 to 110 g / m ² .

  In the panty liner 30, as shown in an enlarged view in FIG. 5, the liquid 25 given to the skin side surface 3 is drawn in by the hydrophilicity of the second nonwoven fabric 33 and quickly passes through the first nonwoven fabric 32. Then, the liquid 25 is held inside the second nonwoven fabric 33. Therefore, it is difficult for the liquid to remain on the skin side surface 3, and it is difficult to give the skin a sticky feeling.

FIG. 6 shows a panty liner 50 according to a second embodiment of the present invention, and is an enlarged cross-sectional view schematically showing the function of absorbing liquid while showing an enlarged configuration thereof.

The shape of this panty liner 50 is the same as the reference example shown in FIG. The main body 60 is formed of the liquid holding sheet 51, the back sheet 12, and the pressure sensitive adhesive layer 13. The illustration of the release sheet 20 is omitted. The back sheet 12, the pressure sensitive adhesive layer 13, and the release sheet 20 are the same as those in the above reference example .

The liquid holding sheet 51 of the panty liner 50 includes a first nonwoven fabric 52 and a second nonwoven fabric 53. The first nonwoven fabric 52 appears on the skin side surface 3, and the second nonwoven fabric 53 is positioned on the clothing side. . The first nonwoven fabric 52 and the second nonwoven fabric 53 are bonded via a hot melt adhesive. The application amount of the hot melt adhesive is 5 to 30 g / m ² so as not to prevent the liquid from passing from the first nonwoven fabric 52 to the second nonwoven fabric 53 and not to disturb the soft texture of the entire panty liner 50. Set within range. Moreover, the application amount of the hot-melt adhesive that bonds the second nonwoven fabric 53 and the back sheet 12 is the same.

  The panty liner 50 has a thickness of 1 mm or less, and a Gurley rigidity value of 0.7 mN or less in both the vertical direction and the horizontal direction.

The said 1st nonwoven fabric 52 has the upper layer 15 and the lower layer 16, and is the same structure as the nonwoven fabric which comprises the liquid holding sheet 11 of the panty liner 1 of a reference example . The fiber configuration of the upper layer 15 and the lower layer 16 is the same as that of the reference example . The upper layer 15 is formed of 70% by mass of cotton and 30% by mass of weakly hydrophilic PET, and the lower layer 16 is durable by 60% by mass of rayon fibers. It is formed from a lower layer fiber web of hydrophilic PET 40% by mass. The first nonwoven fabric 52 is a two-layer spunlace nonwoven fabric obtained by laminating an upper layer fiber web on the lower layer fiber web to give a water jet.

However, the basis weight of the first nonwoven fabric 52 is smaller than the basis weight of the liquid holding sheet 11 in the reference example , the basis weight of the first nonwoven fabric 52 is 35 g / m ² , the upper layer 15 is 15 g / m ² , and the lower layer 16 is 20 g / m ² . The treatment energy by the water jet is 0.2 (kw / m ² ) per one, and one that has been treated six times is used. The total processing energy is 1.2 (kw / m ² ). Since the basis weight of the first nonwoven fabric 52 is smaller than that of the liquid holding sheet 11, the processing energy is also lower than that of the liquid holding sheet 11.

The second nonwoven fabric 53 is the same as the second nonwoven fabric 33 of the first embodiment, and is a spunlace nonwoven fabric with 100% rayon fibers and a basis weight of 25 g / m ² . The processing energy by the water jet is 0.16 (kw / m ² ) per time, and the one that has been processed three times is used. The total processing energy is 0.48 (kw / m ² ).

  The lower nonwoven fabric 16 has a higher water absorption of the first nonwoven fabric 52 than the upper layer 15, and the difference is 10 mm or more and 100 mm or less. The second nonwoven fabric 53 has a Klem water absorption higher than that of the lower layer 16 of the first nonwoven fabric 52, and the difference is 10 mm or more, preferably 20 mm or more, and the upper limit is 100 mm.

In the second embodiment, Klemm water absorbency of the upper layer 15 of the first nonwoven fabric 52 is 69 mm, in Klemm water absorbency of the lower layer 16 is 80 mm, Klemm water absorbency of the second nonwoven fabric 53 is 113 mm.

A preferable range of the basis weight of the first nonwoven fabric 52 is 25 to 50 g / m ² , and a preferable range of the basis weight of the second nonwoven fabric 53 is 20 to 60 g / m ² . The total basis weight of the liquid holding sheet 51 composed of the first nonwoven fabric 52 and the second nonwoven fabric 53 is 45 to 110 g / m ² .

  In this panty liner 50, as shown in FIG. 6, the liquid 25 applied to the skin side surface 3 is quickly drawn by the hydrophilicity gradient of the first nonwoven fabric 52 and further by the hydrophilicity of the second nonwoven fabric 53. The liquid 25 is held inside the second nonwoven fabric 53. Therefore, it is difficult for the liquid to remain on the skin side surface 3, and it is difficult to give the skin a sticky feeling.

  In each of the above embodiments, the nonwoven fabric is formed by a water jet process, but each nonwoven fabric may not contain a binder, and fibers may be entangled by a needle punch method.

Table 1 below shows examples and reference examples , and Table 2 shows comparative examples.
(1) In the following Reference Examples Reference Example Corresponding to FIGS. 2 and 3, the water jet process conditions are the same as described in Reference Example.

( Reference Example 1)
It is the same as that described as the reference example , and a liquid holding sheet 11 of a two-layer spunlace nonwoven fabric is used. The upper layer 15 is formed from an upper fiber web having a basis weight of 20 g / m ² with 70% by mass of cotton (Co) and 30% by mass of weakly hydrophilic PET, and the lower layer 16 is 60% by mass of rayon fibers (Ray) and durable. Hydrophilic PET is formed from a lower layer fiber web having a mass per unit area of 40 g / m ² .

The Krem water absorption is 69 mm for the upper layer 15 and 80 mm for the lower layer 16. This is because the upper-layer fiber web alone produces a nonwoven fabric with a basis weight of 30 g / m ² , and similarly the lower-layer fiber web alone produces a nonwoven fabric with a basis weight of 30 g / m ^2. It is the result of measurement. In each of the following Examples and Reference Examples , the Klem water absorption of the two-layer spunlace was obtained in the same manner.

  The thickness was 0.51 mm, the vertical Gurley rigidity value of the product was 0.34 mN, and the horizontal Gurley rigidity value was 0.32 mN.

( Reference Example 2)
A liquid holding sheet 11 of a two-layer spunlace nonwoven fabric is used. The upper layer 15 is formed from an upper fiber web having a basis weight of 20 g / m ² with 70% by mass of rayon fiber and 30% by mass of weakly hydrophilic PET, and the lower layer 16 has 50% by mass of rayon fiber (Ray) and durable hydrophilic property. PET is formed from a lower fiber web having a basis weight of 40 g / m ^{2 and} a mass of 50% by mass.
The Krem water absorption was 70 mm for the upper layer 15 and 83 mm for the lower layer 16.

  The thickness was 0.51 mm, the longitudinal Gurley rigidity value of the product was 0.31 mN, and the lateral Gurley rigidity value was 0.26 mN.

( Reference Example 3)
A liquid holding sheet 11 of a two-layer spunlace nonwoven fabric is used. The upper layer 15 is formed from an upper fiber web of 20 g / m ^{2 having} a basis weight of 70% by weight of cotton and 30% by weight of weakly hydrophilic PET, and the lower layer 16 has a basis weight of 50% by weight of cotton and 50% by weight of rayon fibers. Is formed from a lower layer fiber web of 40 g / m ² .
The Krem water absorption was 69 mm for the upper layer 15 and 110 mm for the lower layer 16.

  The thickness was 0.49 mm, the longitudinal Gurley stiffness value of the product was 0.33 mN, and the lateral Gurley stiffness value was 0.19 mN.

( Reference Example 4)
A liquid holding sheet 11 of a two-layer spunlace nonwoven fabric is used. The upper layer 15 is formed from an upper fiber web having a basis weight of 20 g / m ² with 20% by mass of rayon fibers and 80% by mass of weakly hydrophilic PET, and the lower layer 16 has 50% by mass of rayon fibers and 50% of durable hydrophilic PET. It is formed from a lower layer fiber web having a mass basis weight of 40 g / m ² .
The Krem water absorption was 12 mm for the upper layer 15 and 83 mm for the lower layer 16.

  The thickness was 0.51 mm, the longitudinal Gurley stiffness value of the product was 0.33 mN, and the lateral Gurley stiffness value was 0.30 mN.

(2) Examples corresponding to the first embodiment shown in FIGS. 4 and 5 In the following examples, the water jet processing conditions are the same as those described in the first embodiment.

(Example 1 )
This is the same as described in the first embodiment. That is, the first nonwoven fabric 32 is a spun lace nonwoven fabric having a basis weight of 30 g / m ² with 70% by mass of cotton and 30% by mass of weakly hydrophilic PET, and the second nonwoven fabric 33 is 100% rayon fiber and has a basis weight of 25 g / m ^2. it is a spunlace non-woven fabric of m ^2.
The Krem water absorption was 69 mm for the first nonwoven fabric 32 and 113 mm for the second nonwoven fabric 33.

  The thickness was 0.64 mm, the longitudinal Gurley stiffness value of the product was 0.29 mN, and the lateral Gurley stiffness value was 0.13 mN.

(Example 2 )
The second nonwoven fabric 33 is the same as in Example 1 . The first nonwoven fabric 32 is a spunlace nonwoven fabric having a weight per unit area of 30 g / m ² with 60% by mass of cotton and 40% by mass of durable hydrophilic PET.
The Krem water absorption was 92 mm for the first nonwoven fabric 32 and 113 mm for the second nonwoven fabric 33.

  The thickness was 0.65 mm, the longitudinal Gurley stiffness value of the product was 0.30 mN, and the lateral Gurley stiffness value was 0.13 mN.

(3) Example Corresponding to Second Embodiment Shown in FIG. 6 In the following examples, the water jet processing conditions are the same as those described in the first embodiment.

(Example 3 )
This is the same as described in the second embodiment.

In the first nonwoven fabric 52, the upper layer 15 (weighing 15 g / m ² ) is 70% by mass of cotton, the weakly hydrophilic PET is 30% by mass, the lower layer 16 (weighing 20 g / m ² ) is 60% by mass of rayon fiber, and the durable hydrophilic PET Is a two-layer spunlace nonwoven fabric of 40% by mass.
The second nonwoven fabric is the same as the second nonwoven fabric of Reference Example 4.

  The Krem water absorption was 69 mm for the upper layer 15, 80 mm for the lower layer 16, and 113 mm for the second nonwoven fabric 53.

  The thickness was 0.65 mm, the longitudinal Gurley rigidity value of the product was 0.21 mN, and the lateral Gurley rigidity value was 0.45 mN.

(4) Comparative Example (Comparative Example 1)
Instead of the liquid holding sheet 11, a single-layer spunlace nonwoven fabric containing 40% by mass of cotton and 60% by mass of durable hydrophilic PET and having a basis weight of 40 g / m ² was used.
The water absorption by Klem was 102 mm.

  The thickness was 0.55 mm, the vertical Gurley rigidity value of the product was 0.45 mN, and the horizontal Gurley rigidity value was 0.23 mN.

(Comparative Example 2)
Instead of the liquid holding sheet 11, a two-layer spunlace nonwoven fabric was used. The upper layer is formed from an upper fiber web having a basis weight of 40 g / m ² with 60% by weight of rayon fibers and 40% by weight of durable hydrophilic PET, and the lower layer has 70% by weight of cotton and 30% by weight of weakly hydrophilic PET. It was formed from a lower layer fiber web having a basis weight of 20 g / m ² . That is, the liquid holding sheet 11 of Reference Example 1 was used with the upper and lower surfaces reversed.
The Krem water absorption was 80 mm for the upper layer and 69 mm for the lower layer.

  The thickness was 0.51 mm, the vertical Gurley rigidity value of the product was 0.34 mN, and the horizontal Gurley rigidity value was 0.32 mN.

(Comparative Example 3)
Instead of the first nonwoven fabric 32 shown in FIGS. 4 and 5, a spunlace nonwoven fabric having 100% cotton and a basis weight of 35 g / m ² was used. Instead of the second non-woven fabric 33, a core-sheath type composite synthetic fiber having a core part of PET and a sheath part of PE is made of 100% of a hydrophilic oil agent, and the basis weight of the fibers fused with hot air is 35 g / m ² . An air-through nonwoven fabric was used.
The Krem water absorption was 103 mm for the first nonwoven fabric and 6 mm for the second nonwoven fabric.

  The thickness was 2.00 mm, the longitudinal Gurley stiffness value of the product was 0.75 mN, and the lateral Gurley stiffness value was 1.18 mN.

(Comparative Example 4)
A three-layer spunlace nonwoven fabric was used in place of the first nonwoven fabric 52 shown in FIG. The upper layer (weight per unit area: 18 g / m ² ) and lower layer (weight per unit area: 10 g / m ² ) were 60% by mass of rayon fiber, 20% by mass of weakly hydrophilic PET, and 20% by mass of hydrophobic PP. The middle layer was 100% rayon fiber and the basis weight was 10 g / m ² .

Instead of the second non-woven fabric 53, an air-through non-woven fabric with a core-sheath type composite synthetic fiber having a core portion of PET and a sheath portion of PE and having a hydrophilic oil agent attached thereto and having a basis weight of 25 g / m ² was used.

  The Krem water absorption was 95 mm, 113 mm, and 95 mm for the upper layer, middle layer, and lower layer, and 8 mm for the second nonwoven fabric.

  The thickness was 1.5 mm, the vertical Gurley rigidity value of the product was 0.76 mN, and the horizontal Gurley rigidity value was 1.39 mN.

(5) Measurement (Gurley stiffness value)
The Gurley rigidity value is determined according to JIS-L1018 using a Gurley stiffness tester (manufactured by Yasuda Seiki) by preparing a test piece obtained by cutting a sheet having the same structure as the panty liner into a width of 25 mm and a length of 38 mm. The chuck is held at one end in the longitudinal direction of the test piece, the chuck is shaken at a constant speed, and the scale at the moment when the rotating rod of the pendulum is separated from the test piece is recorded to measure the stiffness value (mN).

(Clem water absorption)
Evaluation is performed according to JIS-P8141. A test piece is prepared by cutting a nonwoven fabric having the same fiber composition as the upper layer, the lower layer, the first nonwoven fabric, and the second nonwoven fabric into a width of 25 mm and a length of 150 mm. A 0.9% concentration saline solution is put in a container so that the depth becomes 10 mm or more, the test piece is hung vertically, and the lower end thereof is immersed in the saline solution by 5 mm. Measure the suction height of the saline solution from the liquid surface after standing for 10 minutes.

(Absorption time)
A 12 ml syringe is used without a needle, and the test solution is injected into this syringe. The test solution consists of 90% by mass of glycerin and 10% by mass of ion-exchanged water. 1 ml (1 ml) of the above test solution is dropped on the skin side surfaces of Examples , Reference Examples and Comparative Examples with a syringe in 1 second, and the time from the start of dropping until the test solution disappears on the skin side surface is measured. .

(Water absorption)
The panty liners of Examples , Reference Examples and Comparative Examples are placed on a wire mesh with the skin side surface facing upward. Then, 1 liter of 0.9% saline is poured onto the skin side surface in 30 seconds. The mass is measured after leaving as it is for 1 minute. The difference between the mass after measurement and the mass before measurement is the amount of water absorption.

(Water retention amount)
The sample after measuring the water absorption amount is dehydrated by rotating at a rotation speed of 600 rpm for 100 seconds with a centrifuge. The mass is measured after dehydration. The difference between the mass after measurement and the mass before measurement is the water retention amount.

(Surface diffusion area)
A 12 ml syringe is used without a needle, and the test solution is injected into this syringe. The test solution consists of 90% by mass of glycerin and 10% by mass of ion-exchanged water. The syringe is brought into contact with the skin side surfaces of Examples , Reference Examples and Comparative Examples, and 1.0 ml of the test solution is supplied to the skin side surface in 30 seconds, and after left for 1 minute, liquid in the vertical and horizontal directions of the product Measure the diffusion spread dimension. A value obtained by multiplying the vertical diffusion length and the horizontal diffusion length is the surface diffusion area.

(Skin wettability)
A 12 ml syringe is used without a needle, and the test solution is injected into this syringe. The test solution consists of 90% by mass of glycerin and 10% by mass of ion-exchanged water. The syringe is brought into contact with the skin side surfaces of Examples , Reference Examples and Comparative Examples, and 0.5 ml of the test solution is supplied to the skin side surface in 30 seconds. Immediately after that, artificial leather is put on the skin side surface, and a load of 50 g / cm ² is applied and left for 30 minutes. After standing, measure the mass of artificial leather.

  Skin wettability (%) is determined by {(mass of artificial leather after test−mass of artificial leather before test) ÷ test solution injection amount (0.5 ml = 0.5 g)}.

(6) Evaluation In any of the examples of the present invention, the thickness can be 1 mm or less, more preferably 0.8 mm or less and 0.4 mm or more. The Gurley rigidity value can be 0.7 mN or less, more preferably 0.5 mN or less. Therefore, it becomes thin and easily follows the deformation of the underwear.

  The embodiment of the present invention has a short absorption time and is within 25 seconds. Further, the absorption amount is 3 g or more suitable for absorbing vaginal secretions, and the water retention amount is 2 g or more.

In the embodiment of the present invention, the surface diffusion area can be 3 cm ² or less, the skin wetting rate can be less than 8%, and a comfortable feeling can be obtained at the time of wearing.

A plan view showing a panty liner as a reference example , Sectional view taken along line II-II in FIG. The expanded sectional view explaining the composition of the panty liner of the reference example and the absorption function of the liquid, Sectional drawing which shows the panty liner of the 1st Embodiment of this invention, The expanded sectional view explaining the structure of the panty liner of 1st Embodiment, and the absorption function of a liquid, The expanded sectional view explaining the structure of the panty liner of the 2nd Embodiment of this invention, and the liquid absorption function,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Panty liner 3 Skin side surface 4 Clothing side surface 10 Main body part 11 Liquid holding sheet 12 Back sheet 13 Pressure sensitive adhesive layer 15 Upper layer 16 Lower layer 31 Liquid holding sheet 32 First nonwoven fabric 33 Second nonwoven fabric 51 Liquid holding sheet 52 First Nonwoven fabric 53 Second nonwoven fabric

Claims (7)

In a panty liner having a liquid holding sheet and a back sheet stacked on the clothing side of the liquid holding sheet,
The liquid holding sheet is composed of two non-woven fabrics bonded to each other, and each of the non-woven fabrics does not include a bonding agent for bonding the fibers, and the fibers are entangled with each other , and the first non-woven fabric appears on the skin side surface. Is formed of hydrophilic fibers and hydrophobic or weakly hydrophilic synthetic resin fibers, and the second nonwoven fabric located on the clothing side is formed of at least hydrophilic fibers, and the second nonwoven fabric is more than the first nonwoven fabric. The water absorption of Klem is high, the difference is 10 mm or more,
A panty liner, wherein the second nonwoven fabric has a higher hydrophilicity than the first nonwoven fabric . In a panty liner having a liquid holding sheet and a back sheet stacked on the clothing side of the liquid holding sheet,
The liquid holding sheet is formed by joining a first nonwoven fabric appearing on the skin side surface and a second nonwoven fabric located on the clothing side, and the first nonwoven fabric and the second nonwoven fabric join fibers to each other. It is a nonwoven fabric in which fibers are entangled without containing a bonding agent,
In the first nonwoven fabric, the skin side surface is formed of hydrophilic fibers and hydrophobic or weakly hydrophilic synthetic resin fibers, and the clothing side surface is formed of at least hydrophilic fibers. The layer appearing on the clothing side surface is higher than the layer appearing on the side surface,
The second nonwoven is formed of at least hydrophilic fibers, panty liners hydrophilicity is characterized by higher than the layer appearing on the garment surface of the first nonwoven fabric. The Klem water absorption of the first nonwoven fabric is higher in the layer appearing on the clothing side surface than in the layer appearing on the skin side surface, and the difference is 10 mm or more. 3. The panty liner according to claim 2 , wherein the degree is higher than the water absorption of the clem in the layer appearing on the clothing side surface of the first nonwoven fabric, and the difference is 10 mm or more. The first non-woven fabric forms an upper layer fiber web containing the hydrophilic fiber and a hydrophobic or weakly hydrophilic synthetic resin fiber on a lower layer fiber web having hydrophilic fibers, and the fibers of both fiber webs are joined together. The panty liner according to claim 2 or 3 , wherein the panty liner is formed by being entangled with each other. It said first non-woven fabric of basis weight is 25 to 50 g / m ^2, panty liner according to any one of 4 to basis weight of the second nonwoven claims 1 a 20 to 60 g / m ^2. The panty liner according to any one of claims 1 to 5 , wherein a Gurley rigidity value in a state where the liquid holding sheet and the back sheet are overlapped and joined to each other is 0.7 mN or less. The panty liner according to any one of claims 1 to 6 , wherein a thickness dimension in a state where the liquid holding sheet and the back sheet are overlapped and joined to each other is 1 mm or less.

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