KR101701504B1 - disposable Absorbents - Google Patents

Abstract

The present invention relates to a disposable absorbent product, and more particularly, to a disposable absorbent product which comprises a multilayered ADL layer formed with a hydrophilic portion and a hydrophobic portion so as to improve not only the passing speed of body secretion such as urine but also the expansion range of the body secretion Disposable absorbent product.

Description

Disposable Absorbents [0002]

The present invention relates to a disposable absorbent product, and more particularly, to a disposable absorbent product which comprises a multilayered ADL layer formed with a hydrophilic portion and a hydrophobic portion so as to improve not only the passing speed of body secretion such as urine but also the expansion range of the body secretion Disposable absorbent product.

(Hereinafter referred to as "absorbent product") is widely known in the field of personal hygiene, for example, a sanitary napkin, a panty liner for women, a panty incontinence pad, a disposable diaper and the like.

Such an absorbent article generally comprises an inner sheet which is in close contact with the skin of the wearer, an absorbent body which absorbs the body secretion, and an outer sheet which prevents the body secretion absorbed by the absorbent body from escaping from the absorbent article, As shown in Fig. Further, an ADL (Acquisition Distribution Layer) nonwoven fabric which functions to pass and diffuse the body secretion is formed between the inner sheet and the absorbent body.

Specifically, the inner sheet is made of a soft liquid-permeable material for making the user feel comfortable by contacting the skin of the user, and the absorbent body is made of superabsorbent particles capable of absorbing and retaining body secretion of the wearer, pulp fibers And the outer sheet is formed of a liquid-impermeable film material so that the bodily secretions collected in the absorber are not discharged to the outside. In addition, the ADL nonwoven fabric not only rapidly absorbs body secretion, but also diffuses the body secretion to transfer it to the absorber and prevents the skin of the wearer from getting wet.

In order to maximize the function of the ADL nonwoven fabric, it is preferable that the material is made of a nonwoven fabric having a low fiber density and a high baling property. However, the present olefin-based material has a low resilience of the fiber itself, And a high basis weight material is consumed when the ADL nonwoven fabric is manufactured, which raises the manufacturing cost.

Korean Patent Registration No. 10-0715472 discloses an ADL nonwoven fabric having a zigzag wave shape for fixing an absorber to a core lap made of a bottom-shielded mesh film and expanding the diffusion area of bodily secretion. However, the effect of expanding the diffusion area through the shape modification of the ADL nonwoven fabric is insufficient, and it is difficult to keep the wave shape continuously because it is compressed during wear.

Therefore, it is urgent to develop ADL nonwoven fabric which can maintain or improve the performance of conventional ADL nonwoven fabric and which is low in manufacturing cost.

Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a method for improving the speed of passage of body secretion such as urine by including a multilayered ADL layer in which a hydrophilic part and a hydrophobic part are formed, And to provide an extended disposable absorbent product.

The present invention also provides a disposable absorbent product which is excellent in absorption and spreading performance of body secretion by including a nonwoven fabric for disposable absorbent articles excellent in bulkiness and resilience.

According to an aspect of the present invention, there is provided an image forming apparatus comprising: an inner sheet layer, an Acquisition-Distribution Layer (ADL) layer, a core layer and an outer sheet layer sequentially laminated from the inside, Layer and a hydrophobic non-woven layer.

According to a preferred embodiment of the present invention, the hydrophilic nonwoven fabric layer of the disposable absorbent article of the present invention comprises staple fibers having a fineness of 5 to 12 denier, and the hydrophobic nonwoven fabric layer has staple fibers having a fineness of 1.5 to 5 denier .

According to another preferred embodiment of the present invention, the hydrophilic nonwoven fabric layer of the disposable absorbent article of the present invention comprises at least one of a polyethylene terephthalate (PET) hollow fiber, a polyethylene terephthalate (PET) fiber and a thermo- And at least one of the fibers included in the hydrophilic nonwoven fabric layer may be coated with a hydrophilic processing finishing oil.

According to another preferred embodiment of the present invention, in measuring the wettability of the surface of the disposable absorbent article of the present invention with water, the contact angle between the surface and the water droplet may be 90 DEG or less.

According to another preferred embodiment of the present invention, the hydrophilic nonwoven fabric layer of the disposable absorbent article of the present invention comprises 100 to 130 parts by weight of a polyethylene terephthalate (PET) hollow fiber, And 100 to 130 parts by weight of a polyethylene terephthalate (PET) fiber.

According to another preferred embodiment of the present invention, the thermoadhesive conjugate fiber of the disposable absorbent article of the present invention comprises a thermoplastic polyester elastomer having a melting point of 150 to 160 DEG C and an intrinsic viscosity of 1.0 to 2.0, , A polyester having an intrinsic viscosity of 0.45 to 0.80.

(TPA), dimethyl terephthalate (DMT), isophthalic acid (IPA), and dimethyl isophthalate (DMI). The thermoplastic polyester elastomer of the disposable absorbent article of the present invention is made of a thermoplastic polyester elastomer, A diol component containing at least one of poly (tetramethylene ether) glycol (PTMG), 1,4-butanediol (1,4-BD) and ethylene glycol (EG) Component includes a polymerized copolymer, and may have a hard segment-soft segment structure.

According to another preferred embodiment of the present invention, the thermoplastic conjugated fiber of the disposable absorbent article of the present invention may be a circular or heterogeneous hollow eccentric side-by-side type.

According to another preferred embodiment of the present invention, the hydrophobic nonwoven fabric layer of the disposable absorbent article of the present invention comprises at least one of polyethylene terephthalate (PET) hollow fiber, polyethylene terephthalate (PET) fiber and cis- And at least one of the fibers contained in the hydrophobic nonwoven fabric layer may be coated with a hydrophobic processing oil.

According to another preferred embodiment of the present invention, in measuring the wettability of the surface of the hydrophobic nonwoven fabric layer of the disposable absorbent article of the present invention with respect to water, the contact angle between the surface and the water droplet may be 120 ° to 135 °.

According to another preferred embodiment of the present invention, the hydrophobic nonwoven fabric layer of the disposable absorbent article of the present invention comprises 100 to 130 parts by weight of a polyethylene terephthalate (PET) hollow fiber with respect to 100 parts by weight of the cis- , And 100 to 130 parts by weight of a polyethylene terephthalate (PET) resin.

According to another preferred embodiment of the present invention, the sheath-core type conjugate fiber of the disposable absorbent article of the present invention is a sheath portion of a low melting point (LM) polyester and the core portion may be polyethylene terephthalate (PET).

According to a preferred embodiment of the present invention, the low melting point (LM) polyester of the sheath portion of the disposable absorbent article of the present invention has a melting point of 110 to 180 DEG C and an intrinsic viscosity of 0.5 to 0.9 dl / g, Terephthalate (PET) may have a melting point of 200 to 260 캜 and an intrinsic viscosity of 0.6 to 1.0 dl / g.

According to a preferred embodiment of the present invention, the disposable absorbent article of the present invention may have a basis weight ratio of the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer of 1: 0.5 to 1.5.

According to a preferred embodiment of the present invention, the disposable absorbent article of the present invention can be a disposable diaper, a sanitary napkin or a panty liner.

In addition, the disposable absorbent article may be a food, a poultice, a medical, or a dog absorbent pad, and may be a food or beverage pad.

The disposable absorbent product of the present invention includes a multilayered ADL layer formed with a hydrophilic portion and a hydrophobic portion, thereby not only improving the passing speed of body secretion such as urine but also extending the diffusion range of the body secretion.

In addition, the disposable absorbent article of the present invention includes a nonwoven fabric for a disposable absorbent article excellent in bulkiness and resilience, and thus has excellent absorption and spreading performance of body secretion.

1 is an exemplary view of a disposable absorbent article according to a preferred embodiment of the present invention.
2 is a cross-sectional view cut with a disposable absorbent product A-A 'according to a preferred embodiment of the present invention.
3 is a view showing an ADL layer of a disposable absorbent article according to a preferred embodiment of the present invention.
4 is a view of a circular eccentric side-by-side type heat-adhesive composite fiber according to an embodiment of the present invention.
5 is a view of an eccentric side-by-side type thermo-adhesive composite fiber according to one preferred embodiment of the present invention.
6 is a schematic view of a cis-core type conjugate fiber according to a preferred embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

As described above, the material of the ADL (Acquisition Distribution Layer) nonwoven fabric, which is one of the components of the conventional absorbent product, is preferably made of a nonwoven fabric having a low fiber density and a high elastic modulus. However, the present olefin- There is a problem that the manufacturing cost is increased because the resilience of the nonwoven fabric is low and the high basis weight material is consumed in manufacturing the ADL nonwoven fabric.

Therefore, it is urgent to develop an ADL nonwoven fabric which can maintain or improve the performance of conventional ADL nonwoven fabric and which is low in manufacturing cost.

Accordingly, the present invention provides a disposable absorbent article comprising an inner sheet layer, an Acquisition-Distribution Layer (ADL) layer, a core layer and an outer sheet layer sequentially laminated from the inside, wherein the ADL layer comprises a hydrophilic nonwoven fabric layer sequentially laminated from the inside and The disposable absorbent article of the present invention includes a hydrophobic nonwoven fabric layer and a hydrophobic nonwoven fabric layer. The disposable absorbent article includes a hydrophobic nonwoven fabric layer and a hydrophobic nonwoven fabric layer. Disposable absorbent products can be provided.

In addition, the disposable absorbent product of the present invention can provide a disposable absorbent product having excellent absorption and spreading performance of body secretion by including a nonwoven fabric for a disposable absorbent article having excellent bulkiness and resilience.

First, the disposable absorbent product of the present invention is a well known product in the field of personal hygiene, and can be collectively referred to as all products capable of absorbing and retaining body secretion such as menstrual blood or urine from the wearer. Specifically, the disposable absorbent article of the present invention may be a disposable diaper, a sanitary napkin, a panty liner, or a pad for urinary incontinence. In addition, the disposable absorbent article of the present invention may be a food, a poultice, a medical, or a dog absorbent pad, and it may be a food or a diaper absorbent pad.

The disposable absorbent article of the present invention will be described in more detail with reference to FIGS. 1 and 2. FIG.

The disposable absorbent article 100 of the present invention is a structure in which an inner sheet layer 10, an ADL layer 20, a core layer 30, and an outer sheet layer 40 are sequentially laminated from the inside .

The disposable absorbent article 100 includes the inner sheet layer 10, the ADL layer 20, the core layer 30, and the outer sheet layer 40, which are in contact with the wearer's skin. All or a part of them may be in contact with each other and then sequentially stacked, or all or a part of them may be sequentially stacked.

The inner sheet layer 10 may be a liquid pervious sheet in direct contact with the skin of the wearer. Specifically, the inner sheet layer 10 may be composed of a material that is soft and soft to the skin of the wearer, and may be a liquid-permeable fabric, non-woven fabric, or perforated thermoplastic film that easily passes through the body secretion .

The ADL layer 20 may include a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer sequentially layered from the inner side to perform the function of passing and diffusing the bodily secretion, and will be described later.

The core layer 30 performs the function of retaining body fluids to rapidly absorb the body fluid that has passed through the inner sheet layer 10 and prevent the absorbed body fluid from contacting the skin again. The core layer 30 may be formed of a fluff pulp or a superabsorbent polymer. The core layer 30 may be formed of a tissue 31 surrounding a part or the entire surface of the core layer 30 .

The outer sheet layer 40 may be located in the opposite direction to the inner sheet layer 10 adjacent the core layer 30 and in contact with the skin of the wearer.

In addition, the outer sheet layer 40 can function as a liquid impermeable material to prevent the body secretion absorbed in the core layer 30 from being separated from the disposable absorbent article 100 to contaminate the clothes and the surroundings of the wearer .

The outer sheet layer 40 may be made of a thin plastic film and may be formed by adding an inorganic substance such as calcium carbonate or the like and forming (extruding or ejecting) the micropores in the plastic film, So that the user can escape.

In addition, the outer sheet layer 40 may be a thermoplastic film, preferably a polyethylene film or a polypropylene film.

On the other hand, as mentioned above, the ADL layer includes a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer sequentially laminated from the inside. 3, the ADL layer may comprise a hydrophilic nonwoven layer 21 and a hydrophobic nonwoven layer 22 which are sequentially laminated. In other words, one side of the hydrophilic nonwoven fabric layer 21 of the ADL layer is laminated on one side of the inner sheet layer, the other side is laminated to one side of the hydrophobic nonwoven fabric layer 22, and the other side of the hydrophobic nonwoven fabric layer 22, Can be stacked on one side.

The ADL layer having such a structure can improve the passage speed of the bodily secretion through the hydrophilic nonwoven fabric layer 21 and improve the flow rate of the bodily secretion through the hydrophobic nonwoven fabric layer 22 by spreading the bodily secretion flowing through the inner sheet layer There is an effect of expanding the movable path.

More specifically, the hydrophilic nonwoven fabric layer 21 of the ADL layer includes monofilaments having a fineness of 5-12 denier, preferably 6-10 denier, and the hydrophobic nonwoven fabric layer 22 has a fineness of 1.5-5 denier , Preferably between 2 and 4.5 denier. As described above, the hydrophilic nonwoven fabric layer 21 is formed of monofilaments having a fineness of 5 to 12 deniers to improve the passage speed of the sieve secretion by forming a large gap between the monofilaments. The hydrophobic nonwoven fabric layer 22 has a fineness of 1.5 ~ 5 denier staple fibers to narrow the pores between the short fibers so that the movable path can be expanded so that the bodily secretions can be widely diffused.

First, the hydrophilic nonwoven fabric layer will be described in detail as follows.

The hydrophilic nonwoven fabric layer may include at least one of polyethylene terephthalate (PET) hollow fiber, polyethylene terephthalate (PET) fiber, cis-core type conjugate fiber, and thermally adhesive conjugated fiber, preferably polyethylene terephthalate (PET) hollow fiber, polyethylene terephthalate (PET) fiber, and thermally adhesive conjugated fiber.

At this time, at least one of the fibers included in the hydrophilic nonwoven fabric layer may be coated with a hydrophilic processing finishing oil.

The hydrophilic nonwoven fabric layer including the fibers coated with the hydrophilic processing oil may be absorbed within 0.1 to 1.0 seconds as soon as the water droplet comes into contact with the surface when measuring the wettability of the surface of the hydrophilic nonwoven fabric layer with water, The contact angle between the surface and the water droplet may be 90 DEG or less.

Specifically, in order to measure the wettability (contact angle) with respect to the hydrophilic nonwoven fabric layer, the contact angle formed by the surface and the water droplet can be measured by a contact angle measuring device. A method of calculating the interfacial tension (gamma) optimized for the shape of the droplet finally taken after taking the shape of the droplet with a CCD camera can be used. The injection volume was adjusted to 3.0 mL through a microsyringe and secondary distilled water could be used. Since the contact angle may cause an error depending on the chemical non-uniformity and roughness of the surface, it is possible to measure the contact angle by performing an experiment in the range of the error range not exceeding the maximum of ± 2 ° by analyzing 10 times or more.

In addition, the sinking time for fibers coated with hydrophilic oil may be 1 to 3 seconds.

The immersion time was determined by drying the fiber coated with the hydrophilic finishing oil at 105 ± 5 ° C. for 30 to 50 minutes and then allowing to stand at room temperature for 20 to 40 minutes, It may be the time taken to sink 3cm after dropping to pure water at 30 ~ 50 ℃ after rounding into ball shape.

The hydrophilic nonwoven fabric layer may include 100 to 130 parts by weight, preferably 110 to 120 parts by weight, of polyethylene terephthalate (PET) hollow fiber, based on 100 parts by weight of the thermally adhesive composite fiber or the cis- If it is contained in an amount of less than 100 parts by weight, the adhesion point of the nonwoven fabric may be decreased to decrease the thickness of the nonwoven fabric and decrease the absorption performance of the body secretion. Problems can arise.

The hydrophilic nonwoven fabric layer may contain 100 to 130 parts by weight, preferably 110 to 120 parts by weight, of polyethylene terephthalate (PET) fibers per 100 parts by weight of the thermally adhesive conjugated fiber or cis-core type conjugated fiber. And. If it is contained in an amount of less than 100 parts by weight, the non-woven fabric may be deteriorated in strength. If the amount of the non-woven fabric is more than 130 parts by weight,

4 and 5, a thermoplastic polyester elastomer having a melting point of 150 to 160 DEG C and an intrinsic viscosity of 1.0 to 2.0 dl / g, a melting point of 255 to 265 DEG C, a melting point of 0.45 RTI ID = 0.0 > dl / g. ≪ / RTI >

First, since the thermoplastic polyester elastomer (A) has an intrinsic viscosity of 150 to 160 ° C and an intrinsic viscosity of 1.0 to 2.0 dl / g, the function of imparting the elasticity of the heat- And imparts a function of bonding to adjacent fibers.

Wherein the thermoplastic polyester elastomer (A) comprises an acid component comprising at least one of terephthalic acid (TPA), dimethyl terephthalate (DMT), isophthalic acid (IPA) and dimethyl isophthalate (DMI), poly (tetramethylene ether) And a copolymer of a diol component polymerized with at least one of glycol (PTMG), 1,4-butanediol (1,4-BD) and ethylene glycol (EG) And a high elastic recovery rate can be obtained.

The acid component and the diol component of the thermoplastic polyester elastomer (A) can be reacted at a molar ratio of 1: 1, and generally, some diol components may be added in excess to improve the polymerization reactivity. In other words, when terephthalic acid is used as the acid component to improve the polymerization reactivity, a diol component of 1.2 to 1.4 moles per mole of terephthalic acid may be added. When dimethyl terephthalate is used as the acid component, 1 mole of dimethyl terephthalate 1.4 to 1.8 moles of the diol component is added to the thermoplastic polyester elastomer (A) to produce the thermoplastic polyester elastomer (A).

The thermoplastic polyester elastomer (A) may have an elastic recovery rate within a range of 85 to 100%. If the elastic recovery rate of the thermoplastic polyester elastomer (A) is less than 85%, the elastic and / or elastic recovery rate of the thermally adhesive conjugated fiber and the thermally adhesive conjugated composite fiber obtained according to the present invention , Shape stability and the like may be lowered.

The acid component constituting the thermoplastic polyester elastomer (A) may be a mixture of 70 to 80 mol% of terephthalic acid and 20 to 30 mol% of isophthalic acid, and the diol component may be 80 to 95 mol% Butanediol, 5 to 20 mol% of poly (tetramethylene ether) glycol and ethylene glycol (EG).

 Next, since the polyester (B) of the thermally adhesive composite fiber has a melting point of 255 to 265 DEG C and an intrinsic viscosity of 0.45 to 0.80 dl / g, the thermally adhesive composite fiber and the nonwoven fabric It is possible to impart strength and shape stability as high as possible to post-processing.

The polyester (B) of the thermosetting conjugate fiber can use not only new polyester but also recycled polyester obtained by regenerating waste polyester as a scrap generated in the production process of polyester product.

On the other hand, the thermosetting conjugate fiber has a thermoplastic polyester elastomer (A) having a melting point of 150 to 160 DEG C and an intrinsic viscosity of 1.0 to 2.0 dl / g, a melting point of 255 to 265 DEG C, a melting point of 0.45 to 0.80 dl / g (B) having an intrinsic viscosity, and a latent crimp-based development in which thermo-adhesive conjugate fibers are crimped by the fiber cross-sectional shape and intrinsic viscosity difference of the polymer or a subsequent heat treatment process condition, Lt; RTI ID = 0.0 > elasticity < / RTI >

In addition, the thermoplastic polyester elastomer (A) may have a hard segment-soft segment structure, and can exhibit chemical structural elasticity and elastic recovery rate by such a structure.

In addition, the latent crimpability in which crimp is formed on the thermosetting conjugate fiber can give high elasticity and bulkiness of the nonwoven fabric made of the thermosetting conjugate fiber.

Further, the thermosetting conjugate fiber may be a circular eccentric side-by-side type as shown in FIG. 4 or an eccentric side-by-side type of a hollow hollow as shown in FIG.

Next, the polyethylene terephthalate (PET) hollow fiber of the hydrophilic nonwoven fabric layer may have a hollow ratio of 10 to 40%, preferably 12 to 25%, as high-elasticity and high-elasticity fibers. If the hollow fiber of the polyethylene terephthalate (PET) hollow fiber is less than 10%, there may be a problem of lowering the thickness and bulkyness of the nonwoven fabric, and if it exceeds 40% There may be a problem of a decrease in stability.

When the polyethylene terephthalate (PET) hollow fiber is a PET-based hollow fiber, the specific copolymerization composition is not particularly limited and may include modified polyethylene terephthalate. As a non-limiting example, the modified polyethylene terephthalate may further include a sulfonated metal salt in addition to conventional monomers, and as a non-limiting example, dimethylsulfone isophthalate sodium salt may be used. In addition, aromatic polycarboxylic acids other than terephthalic acid may be further included as a monomer, and as a non-limiting example, it may be any one or more of dimethyl terephthalate, isophthalate, and dimethyl isophthalate. Further, as the diol component, a diol component other than ethylene glycol may be further included as a monomer. Examples of such a diol component include neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 4-butanediol, 1,6-hexanediol, and the like.

remind The melting point of the polyethylene terephthalate (PET) hollow fiber may be from 200 to 260 캜. If the melting point of the polyethylene terephthalate (PET) hollow fiber is less than 200 ° C, there may be a problem in cross-sectional formability. If the melting point exceeds 260 ° C, the spinning temperature is too high.

The polyethylene terephthalate (PET) hollow fiber may have an intrinsic viscosity of 0.6 to 1.0 dl / g. If the intrinsic viscosity is less than 0.6 dl / g, there may be a problem in cross-sectional formability. If the intrinsic viscosity exceeds 1.0 dl / g, the PACK pressure may be high, which may lead to radioactivity problems.

On the other hand, the polyethylene terephthalate (PET) hollow fiber may have a fiber length of 30 to 70 mm, preferably 35 to 55 mm. If the fiber length is less than 30 mm, the physical bonding of the constituent fibers in the nonwoven carding process is insufficient, And the stability of the nonwoven fabric may be inferior. If it exceeds 70 mm, the entanglement of the constituent fibers in the nonwoven carding process may increase, and the surface uniformity of the nonwoven fabric may be deteriorated.

Next, the polyethylene terephthalate (PET) fiber of the hydrophilic nonwoven fabric layer may include specifically modified polyethylene terephthalate. In the case of PET fiber, the specific copolymerization composition is not particularly limited. As a non-limiting example, the modified polyethylene terephthalate may further include a sulfonated metal salt in addition to a conventional monomer, and as a non-limiting example, there may be dimethylsulfone isophthalate sodium salt and the like. In addition, aromatic polycarboxylic acids other than terephthalic acid may be further included as a monomer, and as a non-limiting example, it may be any one or more of dimethyl terephthalate, isophthalate, and dimethyl isophthalate. Further, as the diol component, a diol component other than ethylene glycol may be further included as a monomer. Examples of such a diol component include neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 4-butanediol, 1,6-hexanediol, and the like.

In addition, The polyethylene terephthalate (PET) fiber of the hydrophilic nonwoven fabric layer may have a melting point of 200 to 260 ° C. If the melting point is lower than 200 ° C., there may be a problem in cross-sectional formability. If the melting point is higher than 260 ° C., There may be a problem in radioactivity.

In addition, the polyethylene terephthalate (PET) fiber of the hydrophilic nonwoven fabric layer may have an intrinsic viscosity of 0.6 to 1.0 dl / g. If the intrinsic viscosity is less than 0.6 dl / g, there may be a problem in cross-sectional formability. If the intrinsic viscosity exceeds 1.0 dl / g, the PACK pressure may be high, which may lead to radioactivity problems.

The cross-sectional shape of the polyethylene terephthalate (PET) fiber of the hydrophilic nonwoven fabric layer is not particularly limited and may be circular, elliptical, triangular, or the like, but may be circular, as an example of the cross-sectional shape.

Next, the hydrophobic nonwoven fabric layer will be described in detail as follows.

The hydrophobic nonwoven fabric layer may include at least one of polyethylene terephthalate (PET) hollow fiber, polyethylene terephthalate (PET) fiber, thermo-adhesive conjugated fiber and cis-core type conjugated fiber, and preferably polyethylene terephthalate (PET) hollow fiber, polyethylene terephthalate (PET) fiber, and sheath-core type conjugate fiber.

At this time, at least one of the fibers included in the hydrophobic nonwoven fabric layer may be coated with a hydrophobic processing oil.

The hydrophobic nonwoven fabric layer including fibers coated with hydrophobic processing oil may have a contact angle of 120 to 135 ° between the surface and the water droplet when measuring the wettability of the surface of the hydrophobic nonwoven fabric layer with respect to water.

Specifically, in order to measure the wettability (contact angle) with respect to the hydrophobic nonwoven fabric layer, the contact angle formed by the surface and the water droplet can be measured with a contact angle measuring device. A method of calculating the interfacial tension (gamma) optimized for the shape of the droplet finally taken after taking the shape of the droplet with a CCD camera can be used. The injection volume was adjusted to 3.0 mL through a microsyringe and secondary distilled water could be used. Since the contact angle may cause an error depending on the chemical non-uniformity and roughness of the surface, it is possible to measure the contact angle by performing an experiment in the range of the error range not exceeding the maximum of ± 2 ° by analyzing 10 times or more.

In addition, if the sinking time of fibers coated with hydrophobic oil is measured, it may be impossible to deposit even if left for 24 hours.

The immersion time was measured by drying the fiber coated with the hydrophobic oil finishing oil at 105 ± 5 ° C. for 30 to 50 minutes and then leaving at room temperature for 20 to 40 minutes, It may be the time taken to sink 3cm after dropping to pure water at 30 ~ 50 ℃ after rounding into ball shape.

Meanwhile, the hydrophobic nonwoven fabric layer may contain 100 to 130 parts by weight, preferably 110 to 120 parts by weight, of polyethylene terephthalate (PET) hollow fiber with respect to 100 parts by weight of the cis-core type conjugate fiber or heat- If it is contained in an amount of less than 100 parts by weight, the adhesion point may increase to cause a decrease in the thickness of the nonwoven fabric and a decrease in diffusion performance of the body secretion. If the amount exceeds 130 parts by weight, Problems can arise.

The hydrophobic nonwoven fabric layer may contain 100 to 130 parts by weight, preferably 110 to 120 parts by weight, of a polyethylene terephthalate (PET) resin with respect to 100 parts by weight of the sheath-core type conjugate fiber or the heat- If it is contained in an amount of less than 100 parts by weight, the strength of the nonwoven fabric may be lowered, resulting in a problem of lowering productivity in a subsequent step. If the amount exceeds 130 parts by weight, The problem of being absorbed may occur.

6, the sheath portion 2a may be a low melting point (LM) polyester, and the core portion 2b may be polyethylene terephthalate (PET).

First, the sheath 2a is a low melting point (LM) polyester. Specifically, the melting point of the low melting point polyester is preferably 110 to 180 ° C. When the melting point is within the range, the low melting point polyester may be polyethylene terephthalate or modified polyethylene terephthalate. If the melting point of the low melting point polyester is less than 110 캜, there may be a problem of detachment discharge and the spinning workability may be deteriorated. If the melting point exceeds 180 캜, the low melting point effect may be lowered. The low melting point polyester may have an intrinsic viscosity of 0.5 to 0.9 dl / g. If the intrinsic viscosity is less than 0.5 dl / g, there may be problems in the cullet discharge and section formation. If the intrinsic viscosity exceeds 0.9 dl / g, there may be a problem in manifesting the low melting point effect.

Next, the core portion 2b is polyethylene terephthalate, and may specifically include modified polyethylene terephthalate. In general, polyethylene terephthalate included in low melting point fibers can be used without limitation.

The modified polyethylene terephthalate may further include a sulfonated metal salt in addition to a conventional monomer, and as a non-limiting example, a dimethylsulfone isophthalate sodium salt may be used. In addition, aromatic polycarboxylic acids other than terephthalic acid may be further included as a monomer, and as a non-limiting example, it may be any one or more of dimethyl terephthalate, isophthalate, and dimethyl isophthalate. Further, as the diol component, a diol component other than ethylene glycol may be further included as a monomer. Examples of such a diol component include neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 4-butanediol, 1,6-hexanediol, and the like.

remind The melting point of the polyethylene terephthalate may preferably be 200 to 260 캜. If the melting point of the polyethylene terephthalate is less than 200 ° C, there may be problems in spinning and cross-sectional formation. If the melting point exceeds 260 ° C, there may be a radiation problem due to cross-sectional formation and high-temperature spinning.

The polyethylene terephthalate may have an intrinsic viscosity of 0.6 to 1.0 dl / g. If the intrinsic viscosity is less than 0.6 dl / g, there may be a problem in cross-section formation. If the intrinsic viscosity exceeds 1.0 dl / g, the pack pressure may be high and there may be a problem with radioactivity.

On the other hand, the weight ratio of the sheath portion 2a and the core portion 2b in the sheath-core type conjugate fiber 2 may be 8: 2 to 2: 8. If the above range is not satisfied, the morphological stability of the composite fiber may be remarkably decreased or the fusion strength may be lowered.

Next, the polyethylene terephthalate (PET) hollow fiber of the hydrophobic nonwoven fabric layer may have a hollow ratio of 10 to 40%, preferably 12 to 25%, as high elasticity and high-twist strength fibers. If the hollow fiber of the polyethylene terephthalate (PET) hollow fiber is less than 10%, there may be a problem of lowering the thickness and bulkyness of the nonwoven fabric, and if it exceeds 40% There may be a problem of a decrease in stability.

When the polyethylene terephthalate (PET) hollow fiber is a PET-based hollow fiber, the specific copolymerization composition is not particularly limited and may include modified polyethylene terephthalate. As a non-limiting example, the modified polyethylene terephthalate may further include a sulfonated metal salt in addition to conventional monomers, and as a non-limiting example, dimethylsulfone isophthalate sodium salt may be used. In addition, aromatic polycarboxylic acids other than terephthalic acid may be further included as a monomer, and as a non-limiting example, it may be any one or more of dimethyl terephthalate, isophthalate, and dimethyl isophthalate. Further, as the diol component, a diol component other than ethylene glycol may be further included as a monomer. Examples of such a diol component include neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 4-butanediol, 1,6-hexanediol, and the like.

remind The melting point of the polyethylene terephthalate (PET) hollow fiber may be from 200 to 260 캜. If the melting point of the polyethylene terephthalate (PET) hollow fiber is less than 200 ° C, there may be a problem in cross-sectional formability. If the melting point exceeds 260 ° C, the spinning temperature is too high.

The polyethylene terephthalate (PET) hollow fiber may have an intrinsic viscosity of 0.6 to 1.0 dl / g. If the intrinsic viscosity is less than 0.6 dl / g, there may be a problem in cross-sectional formability. If the intrinsic viscosity exceeds 1.0 dl / g, the PACK pressure may be high, which may lead to radioactivity problems.

On the other hand, the polyethylene terephthalate (PET) hollow fiber may have a fiber length of 30 to 70 mm, preferably 35 to 55 mm. If the fiber length is less than 30 mm, the physical bonding of the constituent fibers in the nonwoven carding process is insufficient, And the stability of the nonwoven fabric may be inferior. If it exceeds 70 mm, the entanglement of the constituent fibers in the nonwoven carding process may increase, and the surface uniformity of the nonwoven fabric may be deteriorated.

Next, the polyethylene terephthalate (PET) fiber of the hydrophobic nonwoven fabric layer may include specifically modified polyethylene terephthalate. In the case of the PET fiber, the specific copolymerization composition is not particularly limited. As a non-limiting example, the modified polyethylene terephthalate may further include a sulfonated metal salt in addition to a conventional monomer, and as a non-limiting example, there may be dimethylsulfone isophthalate sodium salt and the like. In addition, aromatic polycarboxylic acids other than terephthalic acid may be further included as a monomer, and as a non-limiting example, it may be any one or more of dimethyl terephthalate, isophthalate, and dimethyl isophthalate. Further, as the diol component, a diol component other than ethylene glycol may be further included as a monomer. Examples of such a diol component include neopentyl glycol, diethylene glycol, neopentyl glycol, 1,3-propanediol, 4-butanediol, 1,6-hexanediol, and the like.

In addition, The polyethylene terephthalate (PET) fiber of the hydrophobic nonwoven fabric layer may have a melting point of 200 to 260 ° C. If the melting point is lower than 200 ° C., there may be a problem in cross-sectional formability. If the melting point is higher than 260 ° C., There may be a problem in radioactivity.

In addition, the polyethylene terephthalate (PET) fiber of the hydrophobic nonwoven fabric layer may have an intrinsic viscosity of 0.6 to 1.0 dl / g. If the intrinsic viscosity is less than 0.6 dl / g, there may be a problem in cross-sectional formability. If the intrinsic viscosity exceeds 1.0 dl / g, the PACK pressure may be high, which may lead to radioactivity problems.

In addition, the cross-sectional shape of the polyethylene terephthalate (PET) fiber of the hydrophobic nonwoven fabric layer is not particularly limited and may be circular, elliptical, triangular, or the like, but may be circular, as an example of the cross-sectional shape.

Meanwhile, in the disposable absorbent article of the present invention, the basis weight ratio of the hydrophilic nonwoven fabric layer and the hydrophobic nonwoven fabric layer may be 1: 0.5 to 1.5, preferably 1: 0.75 to 1.25.

If the disposable absorbent article of the present invention has a hydrophobic nonwoven fabric layer having a basis weight of less than 0.5 basis by weight based on the basis weight of the hydrophilic nonwoven fabric layer, the bodily secretion that has passed through the hydrophilic nonwoven fabric layer is not sufficiently diffused and is transferred to the core layer If the amount exceeds 1.5 basis weight, the rate of passage of the body secretion through the hydrophilic nonwoven fabric layer to the core layer is reduced to increase the amount of backflow into the inner sheet layer and to feel discomfort such as wetness in the contacted skin There may be a problem.

The present invention will now be described more specifically with reference to the following examples. However, the following examples should not be construed as limiting the scope of the present invention, and should be construed to facilitate understanding of the present invention.

Example

Example  One

(1) Using a two-layer carder, the upper carder was spinning and stretched to have a fineness of 7 denier, a fiber length of 64 mm, a hollow ratio of 15, coated with hydrophilic processing oil (takemoto) (TCK, E-PLEX) with a circular eccentric side-by-side type thermoplastic adhesive fiber (TCK, AIRCLO) having a fineness of 6 denier and a fiber length of 64 mm and a denier of 6 denier (PET) fibers (TCK, RPF) having a fiber length of 51 mm were mixed and carded to prepare a hydrophilic nonwoven fabric layer having a basis weight of 15 g / m 2 and a thin web.

At this time, 116.7 parts by weight of the polyethylene terephthalate (PET) hollow fiber and 116.7 parts by weight of the polyethylene terephthalate (PET) fiber were mixed with 100 parts by weight of the thermosetting conjugate fiber.

(2) A polyethylene terephthalate (PET) hollow fiber (TCK) having a fineness of 3 denier, a fiber length of 51 mm and a hollow ratio of 12% coated with a hydrophobic processing oil (takemoto corporation) Core type conjugated fibers (TCK, EZBON-L) having a fineness of 4 denier and a fiber length of 64 mm and circular cross-section polyethylene terephthalate (PET) fibers having a fineness of 3 denier and a fiber length of 51 mm (TCK, RPF ) Were mixed and carded to prepare a hydrophobic nonwoven fabric layer having a thin web having a basis weight of 15 g / m 2.

At this time, 116.7 parts by weight of the first PET hollow fiber and 116.7 parts by weight of the second PET hollow fiber were mixed with 100 parts by weight of the sheath-core type conjugate fiber.

(3) The hydrophilic non-woven fabric layer and the hydrophobic non-woven fabric layer were laminated, followed by a roll-type air-through bonding process at 180 ° C. to prepare a heat-bonded nonwoven fabric having a basis weight of 30 g / m 2 for disposable absorbent products.

(4) The nonwoven fabric for a disposable absorbent article produced was applied to the ADL layer 20 laminated between the inner sheet layer 10 and the core layer 30 shown in Figs. 1 and 2, and the hydrophilic nonwoven fabric layer was laminated on the inner sheet layer 10 ) To prepare a disposable absorbent product.

Example  2

The lower carder of step (2) was prepared in the same manner as in example 1, and the fiber surface coated with hydrophobic processing oil (takemoto) on the surface after spinning and drawing had a fineness of 7 denier, a fiber length of 51 mm, Core type conjugated fibers (TCK, EZBON-L) having a fiber size of 6 denier and a fiber length of 64 mm and a round shape having a fiber size of 51 mm and a polyethylene terephthalate (PET) hollow fiber (TCK) A hydrophobic nonwoven fabric layer having a thin web having a basis weight of 15 g / m 2 was prepared by mixing polyethylene terephthalate (PET) fibers (TCK, RPF) having a cross section and carding.

Example  3

The top carder of step (1) was spin coated with hydrophilic processing oil (takemoto) on the surface after spinning and drawing, and the fineness was 3 denier, the fiber length was 64 mm, the hollow ratio (TCK, E-PLEX) with a circular eccentric side-by-side type thermoplastic adhesive fiber (TCK, HC) having a diameter of 4 denier and a fiber length of 64 mm and a fineness of 3 A hydrophilic nonwoven fabric layer having a thin web having a basis weight of 15 g / m 2 was prepared by carding a circular cross-section polyethylene terephthalate (PET) fiber (TCK, RPF) having a denier and a fiber length of 51 mm.

Example  4

Polyethylene terephthalate (PET) hollow fiber (TCK, AIRCLO) having no hydrophilic processing oil (takemoto) coated on its surface in step (1) was prepared in the same manner as in Example 1, and (2) Polyethylene terephthalate (PET) hollow fibers (TCK, HC) without a hydrophobic processing oil (takemoto) on the surface were used.

Example  5

Except that 150 parts by weight of the polyethylene terephthalate (PET) hollow fiber and 50 parts by weight of the circular cross-section polyethylene terephthalate (PET) were added to 100 parts by weight of the thermally adhesive composite fiber in the step (1) 150 parts by weight of fibers were mixed.

In step (2), 150 parts by weight of the polyethylene terephthalate (PET) hollow fiber and 150 parts by weight of the circular cross-section polyethylene terephthalate (PET) fiber were mixed with 100 parts by weight of the sheath-core type conjugate fiber.

Example  6

80 parts by weight of the polyethylene terephthalate (PET) hollow fiber and 100 parts by weight of the circular cross-section polyethylene terephthalate (PET) were mixed with 100 parts by weight of the thermosetting conjugate fiber in the step (1) 80 parts by weight of fibers were mixed.

In step (2), 80 parts by weight of the polyethylene terephthalate (PET) hollow fiber and 80 parts by weight of the circular cross-section polyethylene terephthalate (PET) fiber were mixed with 100 parts by weight of the sheath-core type conjugate fiber.

Example  7

(TCK, AIRCLO) and the circular eccentric side-by-side heat-sealable conjugate fiber (TCK) were prepared in the same manner as in Example 1 except that the hydrophilic nonwoven fabric layer in the step (1) was made of polyethylene terephthalate , E-PLEX) were mixed and carded to prepare a hydrophilic nonwoven fabric layer having a basis weight of 15 g / m < 2 >

The hydrophobic nonwoven fabric layer in step (2) is prepared by mixing the polyethylene terephthalate (PET) hollow fiber (TCK, HC) and the sheath-core type conjugated fiber (TCK, EZBON-L) A hydrophobic nonwoven fabric layer having a thickness of 15 g / m < 2 >

Example  8

The nonwoven fabric for disposable absorbent articles prepared in the same manner as in Example 1 except that the nonwoven fabric for disposable absorbent articles prepared in the step (4) was applied to the ADL layer (layer) between the inner sheet layer 10 and the core layer 30 shown in FIGS. A disposable absorbent article was prepared by applying a hydrophobic nonwoven fabric layer on one side of the inner sheet layer 10 to the outer sheet 20.

Comparative Example  One

(1) A circular eccentric sheath-core type PE / PET fiber having a fineness of 5 denier and a fiber length of 51 mm, which was dried in an oven at 80 ° C so that the surface was coated with hydrophilic processing oil (takemoto) The ESC-UB was carded to form a thin web, laminated, and then subjected to a roll-type air-through bonding process at a temperature of 150 ° C to form a thermally adhered sheet having a basis weight of 30 g / m 2 A nonwoven fabric for disposable absorbent products was prepared.

(2) A disposable absorbent product was produced by applying the fabricated nonwoven fabric for disposable absorbent products to the ADL layer 20 laminated between the inner sheet layer 10 and the core layer 30 shown in Figs. 1 and 2.

Experimental Example  One

The following properties of the disposable absorbent articles prepared by the above Examples and Comparative Examples were measured and are shown in Table 1.

(1) Method of measuring tensile strength

The fabricated nonwoven fabric for disposable absorbent products was cut to a width of 20 mm and a length of 100 mm, and both ends of the fabric were fixed to a zig of an Instron ^® facility. Then, the nonwoven fabric was pulled at a speed of 100 mm / Tensile strength was measured.

(2) Absorption performance

A cylindrical dosing ring having an inner diameter of 5 cm and a height of 10 cm is placed on the inner sheet layer of the manufactured disposable absorbent article, and artificial urine is filled therein.

① Primary reflux: 80 ml of artificial urine was absorbed once in the disposable absorbent product, and the amount of reflux was observed on the absorbent paper.

② Secondary reflux: After measuring the first reflux, 80 ml of urine was reabsorbed and the amount of residue on the absorbent paper was measured.

③ Absorption time: The time required to completely absorb 80 mL of artificial urine was measured.

④ Absorption area: After 80 mL of artificial urine was completely absorbed, the core layer was separated and the area of urine contact on the surface of the core layer was measured using an area meter.

(3) Method of measuring skin dryness rate

A disposable absorbent article which completely absorbed 80 ml of artificial urine was placed in an environment of a temperature of 30 ° C and a humidity of 65 ± 2%, and the time taken until the drowsiness was not felt by touching the back of the inner sheet layer at intervals of 1 minute was measured.

Example
One Example
2 Example
3 Example
4 Example
5
Nonwoven for disposable absorbent products
Basis weight
(g / m 2) 30 30 30 30 30 thickness
(mm) 5.5 5.5 4.0 5.5 5.0 The tensile strength
(kg / 2in) 4.2 3.6 4.1 4.0 2.3

Absorption performance
1st reflux
(g) 0.1 0.2 0.3 0.2 0.2 2nd reflux
(g) 1.8 3.2 5.3 3.0 3.7 Absorption time
(second) 18.6 18.0 30.9 29.8 26.0 Absorption area
(㎠) 56 45 52 49 50 Skin dry speed (min) 3 4 7 8 5 Example
6 Example
7 Example
8 Comparative Example
One
Nonwoven for disposable absorbent products
Basis weight
(g / m 2) 30 30 30 30 thickness
(mm) 4.5 4.5 5.0 5.5 The tensile strength
(kg / 2in) 4.0 4.0 2.9 4.1

Absorption performance
1st reflux
(g) 0.2 0.2 0.3 0.5 2nd reflux
(g) 3.0 3.0 3.2 7.5 Absorption time
(second) 25.5 25.5 23.2 40.0 Absorption area
(㎠) 44 44 41 53 Skin dry speed (min) 5 5 6 11

As can be seen from the above Table 1, it was confirmed that the disposable absorbent articles prepared in the Examples had higher tensile strength, absorbency and skin dryness than the disposable absorbent articles prepared in Comparative Example.

Specifically, it can be seen that the disposable absorbent article prepared in Example 1 is similar or better in absorption performance and skin dryness than the disposable absorbent article prepared in Example 2, but has a significantly higher tensile strength.

In addition, it can be seen that the disposable absorbent product prepared in Example 1 is similar in tensile strength to the disposable absorbent product prepared in Example 3, but is significantly superior in absorption performance and skin dryness rate.

It can also be seen that the disposable absorbent articles prepared in Example 1 are significantly superior in tensile strength, absorbency and skin dryness than the disposable absorbent articles prepared in Examples 4-7.

It can also be seen that the disposable absorbent product prepared in Example 1 is similar in tensile strength to the disposable absorbent product prepared in Example 8, but is significantly superior in absorbency performance and skin dryness rate.

2: Sheath-core type conjugated fiber
2a: sheath portion 2b: core portion
10: Inner sheet layer 20: ADL layer
21: hydrophilic nonwoven fabric layer 22: hydrophobic nonwoven fabric layer
30: core layer 31: tissue
40: outer sheet layer 100: disposable absorbent article

Claims (14)

delete A disposable absorbent article comprising an inner sheet layer, an Acquisition-Distribution Layer (ADL) layer, a core layer and an outer sheet layer sequentially laminated from the inside,
Wherein the ADL layer includes a hydrophilic nonwoven fabric layer and a hydrophobic nonwoven fabric layer sequentially laminated from the inside,
Wherein the hydrophilic nonwoven fabric layer comprises short fibers having a fineness of 5-12 denier and the hydrophobic nonwoven fabric layer comprises short fibers having a fineness of 1.5-5 denier,
Wherein the hydrophobic nonwoven fabric layer comprises a cis-core type conjugate fiber, a polyethylene terephthalate (PET) hollow fiber and a polyethylene terephthalate (PET) fiber,
Core type conjugate fiber is a low melting point (LM) polyester having a melting point of 110 to 180 占 폚 and an intrinsic viscosity of 0.5 to 0.9 dl / g. The core portion has a melting point of 200 to 260 占 폚 and an intrinsic viscosity of 0.6 to 1.0 dl / lt; RTI ID = 0.0 > g / g, < / RTI &
Wherein at least one of the fibers contained in the hydrophobic nonwoven fabric layer is coated with a hydrophobic processing oil.
3. The method of claim 2,
Wherein the hydrophilic nonwoven fabric layer comprises at least one of a polyethylene terephthalate (PET) hollow fiber, a polyethylene terephthalate (PET) fiber and a thermally adhesive conjugated fiber,
Wherein at least one of the fibers contained in the hydrophilic nonwoven fabric layer is coated with a hydrophilic processing finishing oil.
The method of claim 3,
Wherein a contact angle between the surface of the hydrophilic nonwoven fabric layer and water droplets is 90 DEG or less when measuring the wettability of the surface of the hydrophilic nonwoven fabric layer with respect to water.
The method of claim 3,
Wherein the hydrophilic nonwoven fabric layer comprises 100 to 130 parts by weight of a polyethylene terephthalate (PET) hollow fiber and 100 to 130 parts by weight of a polyethylene terephthalate (PET) fiber, based on 100 parts by weight of the heat- Absorbent products.
The method of claim 3,
The thermosetting conjugate fiber is characterized by comprising a thermoplastic polyester elastomer having a melting point of 150 to 160 DEG C and an intrinsic viscosity of 1.0 to 2.0, a polyester having a melting point of 255 to 265 DEG C and an intrinsic viscosity of 0.45 to 0.80 ≪ / RTI >
The thermoplastic polyester elastomer composition according to claim 6, wherein the thermoplastic polyester elastomer
An acid component containing at least one of terephthalic acid (TPA), dimethyl terephthalate (DMT), isophthalic acid (IPA) and dimethyl isophthalate (DMI), poly (tetramethylene ether) glycol (PTMG), 1,4- (1,4-BD) and ethylene glycol (EG).
Disposable absorbent article characterized by having a hard segment-soft segment structure
The method according to claim 6,
Wherein the thermally adhesive composite fiber is a circular or heterogeneous hollow eccentric side-by-side type.
delete 3. The method of claim 2,
Wherein a contact angle of the surface of the hydrophobic nonwoven fabric layer with a water droplet is in a range of 120 ° to 135 ° when measuring a wettability of the surface of the hydrophobic nonwoven fabric layer with respect to water.
11. The method of claim 10,
Wherein the hydrophobic nonwoven fabric layer comprises 100 to 130 parts by weight of a polyethylene terephthalate (PET) hollow fiber and 100 to 130 parts by weight of a polyethylene terephthalate (PET) fiber, based on 100 parts by weight of the cis- Disposable absorbent products.
delete delete 3. The method of claim 2,
Wherein the basis weight ratio of the hydrophilic nonwoven fabric layer to the hydrophobic nonwoven fabric layer is 1: 0.5 to 1.5.

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