KR20040059244A - An ultra-thin firm type disposable diaper - Google Patents

Abstract

PURPOSE: Provided is an ultrathin disposable diaper, which has absorption power equal to or more than that of a conventional diaper and remarkably decreased thickness. CONSTITUTION: The ultrathin disposable diaper comprises a liquid permeable top sheet(6) to be in direct contact with the user's skin, a liquid impermeable back sheet(4) forming an exterior surface, an absorbent body(5) disposed between the top sheet(6) and the back sheet(4), and coupling parts. In the diaper, the absorbent body(5) comprises fluffy pulps(11), highly absorptive resins(12) and synthetic resins(13). Particularly, the absorbent body(5) contains 18-45 wt% of fluffy pulps, 50-80 wt% of highly absorptive resins and 2-30 wt% of synthetic resins.

Description

Ultra-thin firm type disposable diaper

The present invention relates to a disposable absorbent product such as a diaper having a high water absorption function, and more particularly, a low melting point as a component of the absorber instead of significantly reducing the amount of down pulp constituting the absorbent in the disposable diaper. By adding synthetic fibers, it is an ultra-thin disposable diaper which improves absorption diffusivity while maintaining a very thin and ultra-thin form.

In general, disposable diapers are products that are discarded after one use and are divided into disposable diapers for infants or adults.

The primary function of diapers worn by infant or adult incontinence is to absorb and contain body secretions such as urine.

The diaper can thus prevent the body secretion from soiling or wet the wearer's clothing or other products in the vicinity.

Such disposable diapers are typically disposed between a liquid permeable top sheet that directly contacts the wearer's skin and a liquid impermeable back sheet that forms an outer surface when worn, between the top sheet and the back sheet. It is configured to include an absorbent (Absorbent Core), a leg flap (Flap) having an elastic body as a basic component.

Diapers including these basic components may be formed in various combinations of various types of diapers, but the configuration proposed in US Patent No. 3,860,003, filed Jan. 14, 1975, is widely cited as the preferred form of a disposable diaper.

The diaper comprising the basic component has a diaper in that the flap with an elastic body provides a fluid impermeable barrier between clothes in contact with the edge of the diaper and provides a gasketing action near the wearer's leg. Although effective in preventing spilled sieve discharge into clothing that comes in contact with the edge of the diaper, only one leg flap with an elastomer prevents the diarrhea discharge from leaking between the leg flaps, such as in severe diarrhea. It was not enough.

This problem has been solved by further configuring a blocker having another elastic body inside the leg flap, and various embodiments have been proposed as a blocker in various combinations. For example, Korean Patent Publication No. 1993-0000085 proposes a form in which a "flap" having an elastic member is configured inside the leg flap, and in "No. 194-0008959", a "cutting cuff" is a leg flap. The form comprised between and an absorber is proposed, and the publication No. 10-1995-0008172 proposes the form which comprised the double coagulation van of the same height as a "coagulation band."

Among the above components of these disposable diapers, the topsheet is usually composed of soft to the touch and does not irritate the skin of the wearer, in particular, the topsheet has the property that the liquid body secretion can quickly pass through the absorbent body. Should be. Topsheets suitable as having these properties are manufactured and used from a wide variety of materials such as porous plastic films, natural fibers, synthetic fibers or mixtures of natural and synthetic fibers.

Absorbents are means capable of absorbing and retaining liquid body secretions. Therefore, the absorber is generally composed of Fluffy Pulp and Super Absorbent Polymer as a liquid absorbent material, and tissues for packaging them, and passes through a liquid permeable top sheet. It absorbs body fluid at high speed and retains body fluid to prevent the absorbed body fluid from contacting the skin again. The size, shape (e.g., rectangular, hourglass, etc.), structure and absorbent capacity of the absorbent body are adapted to the wearer from infant to adult, and the absorbent body is attached to a known attachment means such as adhesive on the back sheet. Are attached and fixed.

The backsheet is impermeable to liquids so that the body secretions absorbed and absorbed by the absorber do not contaminate or wet products that are in direct contact with the diaper, such as the wearer's clothing or bed sheet. The backsheet is preferably impermeable to liquids and permeable to gases. As a film having such physical properties, a plastic film has been generally used, and in recent years, a material obtained by adhering a nonwoven fabric to a polyethylene film has been widely used.

The leg flaps are positioned adjacent each longitudinal edge to allow the diaper to be worn and secured to the wearer's leg. The preferred configuration of the leg flaps consists of side flaps and flap elastomers, as specifically described in the aforementioned U.S. Patent No. 3,860,003. When the back sheet is formed by adhering a nonwoven fabric to a polyethylene film, an elastic body may be bonded in a stretchable state between the outer polyethylene film and the nonwoven fabric.

The fastening means performs a function of wearing a disposable diaper on the body to maintain its wearing state. Fastening means are widely used fastening members such as adhesive tape tabs or hooks and loops.

The coagulation band is usually formed adjacent to the absorber of a disposable diaper to prevent urine or fecal glands that cannot be absorbed from the absorber and is configured as a liquid permeable or liquid impermeable material.

The various members of each of the components of the diaper are adhesively fixed by hot melt adhesive, heat fusion, or another bonding method which is well known in the diaper field to form the diaper.

The technical level of disposable diaper products, including adult diapers such as infants and incontinents, has been rapidly developed, and the basic performance in terms of the amount of absorption to absorb and store the body fluids excreted by physiological action is inconvenient for the user. It was possible to adjust so that.

However, diapers should have no side effects on the wearer's skin when they are used, but pruritus (skin itching), redness of the skin (erythema) and skin sores often occur when using disposable diapers, not only for babies wearing disposable diapers. The disadvantages of severe pain and discomfort caused by skin side effects caused by caregivers are not overcome.

The causes of such skin side effects are skin irritation due to ammonia generation by feces, skin irritation by activation of skin bacteria by feces, physical and chemical irritation causing skin friction of disposable diaper materials, and excessive moisture generated while wearing. It is believed to be caused by a combination of factors.

In order to overcome these shortcomings, there have been attempts to apply various product structures, functional materials applying skin protection materials, pH adjusting agents, etc., but the effects are not yet satisfactory.

The technical level of disposable absorbent products, including disposable baby diapers, incontinence diapers, and women's sanitary napkins, has rapidly developed in view of the speed and absorption of absorbed body fluids by physiological action. Thus, the basic performance such as the absorption speed and absorption power of the body fluid can be adjusted so that there is no inconvenience for the user.

Accordingly, the development of disposable diapers has been progressing toward improving the wearing comfort in meeting basic performances. As one method for this, ultra-thin disposable diapers that have made the absorber thinner have recently appeared. An easy way to make ultra-thin disposable diapers is to use a small amount of fluffy pulp, which takes up a lot of volume in the absorber, and to use a lot of super absorbent polymer (SAP). In addition, a lot of elasticity is applied to the fastening means and the waist or thigh to give an excellent fit when worn, and the fastening means are also developed for convenience in use.

In the absorbent body of the disposable diaper composed of the above-mentioned fluffy pulp, superabsorbent resin and tissue, the superabsorbent resin can absorb a large amount of liquid such as water, saline, serous fluid and body fluid (for example, urine, blood and menstrual blood), In addition, it can hold a liquid absorbed under a suitable pressure, it is very useful widely used in absorbent products such as disposable diapers, adult incontinence pads and briefs and physiological products.

However, superabsorbent resins cause a phenomenon called gel blocking, which is a gel swelling of the superabsorbent resin due to the rapid expansion of the particle surface, and this aggregation shields the fluid absorption of some of the superabsorbent resins. In order to reduce or reduce the water absorption per unit weight of the super absorbent polymer.

Due to the gel adhesion phenomenon of the superabsorbent polymer, the superabsorbent polymer is not generally used as it is, but is mixed with a fiber material such as fluffy pulp used in absorbent products, for example, diapers. The fluffy pulp used serves to reduce the gel adhesion by separating particles of the super absorbent polymer from each other.

However, in recent years, due to the economic problems caused by the rise in the price of fluffy pulp can not use as much fluffy pulp as commonly used in the past, according to the diaper manufacturers to reduce the amount of fluffy pulp while the amount of super absorbent resin Trying to increase. However, increasing the amount of superabsorbent polymer by reducing the amount of downy pulp presents a problem that causes more gel adhesion of the superabsorbent polymer.

Therefore, the development of super absorbent polymers used in absorbent products has been of substantial commercial interest. In particular, it is possible to reduce the thickness of absorbent products, while having sufficient absorbent power and excellent absorbing properties of the absorbed liquid. There is a need for the development of resins. Thinner diapers, for example, are not only bulky when worn but also lighter in activity, and are well suited to wear in clothing, making the worn markings less noticeable.

These products are also small in volume and can be packed in small volumes, making it easier for consumers to purchase, transport and store diapers. In addition, packing large quantities in a small volume also reduces dispensing costs for manufacturers and distributors, and reduces storage costs due to the reduced storage space required for the store per diaper unit.

The ability to provide thinner absorbent products, such as diapers, depends on the ability to develop relatively thin absorbents or absorbent structures capable of capturing and storing large quantities of secreted body fluids, especially urine. Absorbents in conventional absorbent products consist of fluffy pulp, which absorbs and diffuses a large amount of liquid and maintains the shape of the absorber, and a superabsorbent resin, which absorbs and stores a large amount of the introduced liquid. have. In such conventional absorbent articles, the absorbent generally comprises less than about 50% by weight of the low superabsorbent resin of the total weight of the absorbent core consisting of downy pulp and superabsorbent resin. Unfortunately, attempts to provide thin absorbents having a superabsorbent polymer at a concentration of at least 50% by weight face several problems.

That is, in such a conventional disposable diaper, the super absorbent polymer is not fixed and can move freely in a limited manner during the manufacturing process or during use (wearing). Thus, the movement of the superabsorbent resin during manufacture may result in handling loss of the superabsorbent resin during the manufacturing process as well as the non-uniform distribution of the particles used.

This problem occurs when the superabsorbent polymer of the absorber absorbs a large amount of the introduced liquid during use (wearing) and moves during swelling or moves after swelling, so that the particles of the superabsorbent polymer cannot be fixed in the optimum position. Adhesion results in insufficient storage of liquid in one area and overcapacity of liquid in another area, leading consumers to complain of agglomeration of diapers.

Due to this problem, the absorbent is configured such that the ratio of the downy pulp, which serves to maintain the shape of the absorbent by restricting the superabsorbent polymer of the absorbent, is 50% by weight or more of the total weight of the absorbent core.

Thus, even if a large amount of fluffy pulp is applied to the absorber, the binding capacity of the fluffy pulp, which maintains its shape in a conventional diaper, is weak, and the structural stability of the absorbent product is deteriorated when a large amount of liquid is absorbed. Since there is a problem that the product will not function, there was a limit to configure the disposable diaper thinly by reducing the amount of fluffy pulp significantly.

Accordingly, the inventors of the present invention have conducted research to produce ultra-thin diaper products having superabsorbent polymers of 50% by weight or more by dramatically reducing the amount of down pulp as an absorbent in existing disposable diaper products, and melting point on the absorbent body. By adopting this low synthetic fiber and melting it at high temperature to bind with the downy pulp, even a small amount of downy pulp maintains the shape of the absorber, but also includes a super absorbent polymer containing at least 50% by weight of the total weight of the absorbent core. The present invention has been completed by discovering that an ultra-thin disposable diaper can be manufactured with a considerably thin thickness while preventing the phenomenon.

The present invention has been invented to solve the problems occurring in the conventional disposable diaper in view of the above situation, a conventional diaper by adding a low melting point synthetic fiber instead of reducing the amount of superabsorbent resin and fluffy pulp in the absorbent body of the disposable diaper It is an object of the present invention to provide an ultra-thin disposable diaper which exhibits an absorbency greater than or equal to that of a product and is remarkably thin in thickness.

1 is an expanded state plan view of the ultra-thin disposable diaper of the present invention,

Figure 2 is a partial cross-sectional view taken along the line A-A of Figure 1,

Figure 3 is a partially enlarged cross-sectional view showing an embodiment of the absorber according to the present invention.

<Description of Symbols for Major Parts of Drawings>

1: shear waist area 2: crotch area

3: back waist area 4: liquid impermeable back sheet

5: absorber 6: liquid permeable top sheet

7 inner solidification band 8 second nonwoven fabric

9: tissue 10: waistband

11: fluffy pulp 12: super absorbent polymer

13: synthetic fiber 14: coagulated band end portion

15: front end fastening means 16: rear end fastening means

17. Coagulation band elastic body 18: Inner coagulation band flap adhesion part

19: fixing part of the fastening means 20: coagulation band end adhesive portion

21: inner flap band flap 22: side flap

23: inner side flap 24: outer side flap

25: curd band side flap 26: outer curd band

27: outer side band band flap 28: outer side band band flap

The ultra-thin disposable diaper of the present invention for achieving the above object is a liquid-permeable topsheet that is in direct contact with the skin of the wearer when worn and a liquid impermeable backsheet that forms an outer surface when worn, and positioned between the topsheet and the backsheet. Disposable diaper having an absorbent and a fastening means, characterized in that the absorbent is made of downy pulp, superabsorbent resin and synthetic fibers.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is an expanded state plan view of the ultra-thin disposable diaper of the present invention can be seen in the same plan as a conventional disposable diaper, but including the synthetic fiber as a component of the absorber (5) between the pulp pulp and synthetic fibers, synthetic fibers and synthetic fibers By fusion, even when the absorbent body 5 including less fluffy pulp of less than 50% by weight of the total weight of the absorbent core is constituted, a functional disposable diaper with remarkably thin thickness can be provided while preventing agglomeration of the absorbent body 5.

In FIG. 1, the disposable diaper D may have an hourglass-type appearance divided into a front waist region 1, a crotch region 2, and a rear waist region 3. The shape does not necessarily have a symmetrical structure between left and right and front and rear, but preferably has a left and right symmetrical structure.

FIG. 2 is a partial cross-sectional view taken along the line A-A in the crotch region 2 of FIG. 1.

In FIG. 2, the inner solidification band 7 and the outer solidification band 26 are formed on the left and right sides of the outer side of the absorber 5 and the upper absorbent 8 to trap body fluids that are separated from the absorber 5. The outer coagulation band 26 forms a pocket for confining body fluids detached from the inner coagulation band 7 with the action of tightening the baby's thigh. 26), it is possible to replace the leg elastic body having the function of tightening the leg thighs of the baby like a conventional panty-type diaper.

The inner coagulation band 7 and the outer coagulation band 26 are formed between the absorbent body 5 and the side edge of the disposable diaper D, and form the inner coagulating band 7 adjacent to the absorber 5. The outer diaphragm band 26 is formed adjacent to the side edge of the disposable diaper D, or the inner coagulation band 7 is formed on the absorbent body 5, and the inner coagulation band 7 and the disposable part are disposed outside the absorbent body 5. The outer coagulation band 26 may be formed between the side edges of the diaper D, and the inner coagulation band 7 and the outer coagulation band 26 may be formed as a coagulation band side flap 25 connected to each other, and are separate. You can also form each of the materials.

The inner side band 7 and the outer side band 26 is the corresponding band flap adhesive portion 18, the corresponding band end portion 14, the corresponding band end adhesive portion 20, the corresponding band elastic body 17, the corresponding band flap 21 ), 28 and the corresponding band side flap 25, but may be formed by changing the configuration requirements of the inner and outer corresponding bands (7), 26 as necessary.

Therefore, at least in the crotch region 2, the corresponding band flaps 21 and 28, other than the corresponding band end adhesive portion 20, form an absorbent pocket outside the absorbent body 5 by the corresponding band elastic body 17. do.

As the inner and outer solidification bands 7 and 26, a hydrophobic nonwoven fabric or a waterproof nonwoven film may be used, and when the hydrophobic nonwoven fabric is used, the solidification band flap 21 is doubled to enhance the hydrophobic effect. It is also possible to form an adhesive or to bond the adhesive band between the flap 21 with an adhesive.

In addition, the inner coagulation band 7 may include one or more elastic bodies on the coagulation band flap 21 between the coagulation band flap attachment portion 18 and the coagulation band end portion 14 so that the coagulation band end portion 14 closely adheres to the baby's skin. As the solid band elastic body 17, one having an elastic modulus of 100 to 300%, preferably one having an elastic modulus of 180 to 200% is employed. The coagulation band elastic body 17 may be formed to have a slope by increasing the elastic modulus as the coagulation band elastic body 17 is closer to the coagulation band end portion 14 or closer to the coagulation band flap adhesion portion 18, and the coagulation band elastic body 17 is mainly burnt. It is used as a form of sincerity, and the elastic yarn is made of polyurethane spandex (Polyurethane Spandex) or natural rubber.

The cuff band end portion 14 is the distal end of the cuff band flap 21 in contact with the baby's skin, and the cuff band flap attachment portion 18 is the absorbent body 5 in which the cuff band flap 21 is in the disposable diaper D. It is a part bonded to the outer side flap 22 in the longitudinal direction of a disposable diaper (D).

In addition, the side flap 22 on the outside of the coagulation band 7 may be formed of a flexible sheet having a non-woven fabric layer adhered to the upper portion of the liquid impermeable back sheet 4 on the outer side of the absorbent body 5 or the liquid impermeable back surface. The sheet 4 may be formed only of the layer, or may be formed of the liquid impermeable back sheet 4 and the solid band side flap 25.

And the corresponding band side flap 25 is the flap extended outward including the corresponding band flap adhesion part 18, The side flap 22 in the at least crotch area 2 of the disposable diaper D is the corresponding band flap adhesion part 18 The inner side flap 23 and the outer side flap 24 are separated by a boundary between the longitudinal adhesive points of the disposable diaper (D), and the width of the outer side flap 24 is set to 10 to 50 mm. When it is set to 15 to 35mm, the side flap 22 on the outside of the absorbent body 5 is less than 10mm or 50mm or more when the width is less than the appearance of the disposable diaper (D) is undesirably undesirable. .

The rotatable band end adhesive portion 20 has a length of the disposable diaper D such that the rotatable band flap 21 forms an absorbent pocket outside the absorber 5 by the rotatable band flap adhesive portion 18 and the rotatable band elastic body 17. An adhesive portion for fixing the coagulation band flap 21 at both side waist regions 1 and 3 in the direction, and the coagulation band end attachment portion 20 is partially fixed on the absorbent body 5, and the absorbent body 50 outside the absorbent body 50. It is preferable to prevent the non-sticking portion from occurring in the side flap 22, and the length of the coagulation band end adhesive portion 20 is generally 50 to the front and back waist regions 1 and 3 of the disposable diaper D. By forming it so that it may become 100 mm, the terminal adhesive part of the outer side coagulation band 26 can be kept in the state which affixed.

In addition to the above configuration, the disposable diaper (D) forms a fastening means and a waistband 10 to be worn and maintained on the baby body.

The fastening means is mainly a re-adhesive rear end fastening means (16) consisting of a fixed portion 19 of the re-adhesive fastening means fixed to the edge of the side flap 22 in the disposable back diaper waist region (3) and a free distal end portion. And a front end fastening means 15 formed in the transverse direction of the front end waist region 1 and providing a target region to which the rear end fastening means 16 can be bonded.

Here, the re-adhesive shear fastening means 16 may be composed of a adhesive tape coated with a known adhesive or a hook or a loop which is a mechanical re-adhesive means, and a shear providing a target area. The fastening means 15 may be composed of a hook or a loop that can be engaged with a hook or a loop, which is a film or a mechanical re-adhesive means, to which a known adhesive tape can be attached. have.

In addition, the waist band 10 is formed by adhering an elastic body to the front and rear waist regions (1) and (3) of the disposable diaper (D), and the elastic body of the waist band 10 is mainly polyurethane foam (Polyurethane Foam) , Polyurethane Film (Polyurethane Film), polyurethane nonwoven elastomer and elastic yarn is used, the elastic yarn is to use polyurethane Spandex (polyurethane Spandex) or natural rubber, the elastic body of the waistband 10 is a disposable diaper ( D) It may be formed across the width of the product in the transverse direction or partially short between the longitudinal end end and the absorber 5 outside.

The absorber 5 is inserted between the liquid impermeable backsheet 4 and the liquid permeable top sheet 6 to be fixed by using a high temperature molten adhesive, and the absorber 5 has a thin thickness to provide cushioning to the baby's skin. A liquid permeable second nonwoven fabric 8 may also be employed on top or bottom of the liquid permeable top sheet 6 to provide the baby with a rapid absorption during urination. In FIG. 2, the bottom of the top sheet 6 is provided. The 2nd nonwoven fabric 8 formed in this is shown.

The liquid permeable second nonwoven fabric 8 diffuses urine, blocks urine absorbed by the absorber 5 from being transferred to the liquid permeable top sheet 6, and functions to protect the absorbent body 5. .

The absorbent body 5 is formed by wrapping the absorbent core made of the downy pulp 11, the super absorbent polymer 12, and the synthetic fiber 13 with a tissue 9, and the performance of the absorbent body 5 is composed of the absorbent core. It depends on the content of fluffy pulp (11), superabsorbent resin (12) and synthetic fibers (13), which are elements, and the shape of the absorbent body (5) is not only T-shaped but also various shapes other than hourglass and straight. Can be formed.

The downy pulp 11 constituting the absorbent body 5 is formed by pulverizing a fibrous web or sheet-like wood pulp, which is widely known in the field of disposable diapers, and the absorbent body 5 contains 10 to 80% by weight of the total weight of the absorbent core. It may be included as the downy pulp 11, but preferably 18 to 45% by weight.

The superabsorbent polymer 12 constituting the absorbent body 5 may also be in the form of particles or in the form of fibers, which are well known in the art, such as acrylate polymer crosslinks and vinyl alcohol-acrylate copolymer crosslinks. Water, maleic anhydride graft polyvinyl alcohol crosslinked product, acrylate-methacrylate copolymer crosslinked product, crosslinked product of saponified methyl acrylate-vinyl acetate copolymer, starch-acrylate graft copolymer crosslinked product, starch Substances such as a crosslinked product of a saponified product of an acrylonitrile graft copolymer, a carboxymethylcellulose crosslinked product, an isobutylene-maleic anhydride copolymer crosslinked product, and a methylene oxide polymer crosslinked product.

These materials may be used alone, or at least two or more thereof may be used as the superabsorbent resin 12. In these materials, the average particle diameter of the polymer particles is preferably 5 to 1,000 µm, and 100 to 600 µm. It is more preferable that is.

In addition, although the superabsorbent polymer 12 is comprised in 10 to 90 weight% of the total weight of an absorber core, the absorber 5 is comprised, Preferably it contains 50 to 80 weight%.

And the synthetic fiber 13 which comprises the absorber 5 is comprised, containing 1-40 weight% of the total weight of an absorber core, Preferably it contains 2-30 weight%.

Therefore, preferably 18 to 45% by weight of the downy pulp (11), 50 to 80% by weight of the super absorbent polymer (12), and 2 to 30% by weight of the synthetic fiber (13), preferably equal to the total weight of the absorbent core of the absorber (5). After mixing and dispersing, the outer periphery of the synthetic fiber 13 is melted at 135 to 165 ° C. to form an absorbent core, and the absorbent body 5 is formed by wrapping it with a tissue 9.

As the synthetic fiber 13, polyethylene fiber, polypropylene fiber, polyester fiber, polyamide fiber, rayon fiber, polyurethane fiber or bicomponent fiber thereof is used.

The bicomponent fibers include side-by-side split bicomponent fibers, sheath and core type sheath and bicomponent fibers, and island in the sea. Fibers and the like can be used, and as the crimped synthetic fibers, bicomponent fibers of side by side type or sheath and core type are preferable.

These fibers can be applied in various thicknesses and lengths according to the structure of the absorber 5 and the required properties, and can be used by mixing various types of fibers and layering them individually. As synthetic fiber 13 used, the thing of 1-20 denier thickness is preferable. In addition, long fibers may be used as the synthetic fiber 13, but short fibers having a length of 0.1 to 100 mm are preferable, and a fiber length similar to that of the fluffy pulp 11 is more preferable at 0.5 to 10 mm.

3 is a partially enlarged cross-sectional view showing an embodiment of the absorber 5 according to the present invention.

In FIG. 3, the particles are superabsorbent resins 12 that absorb and retain a large amount of liquid, and the downy pulp 11, synthetic fibers 13, and synthetic fibers are formed by the surface of the synthetic fibers 13 melted by high temperature heat. The 13 and the synthetic fiber 13 form a network to control the movement of the superabsorbent resin 12, and serve as a rapid absorption and diffusion as shown in the figure.

In the present invention, the configuration of the absorber 5 may be different depending on the object of use of the product and the size and type of use thereof, and may be variously applied depending on the materials.

Specifically, the absorber 5 may mix the down pulp 11, the superabsorbent resin 12, and the synthetic fiber 13 evenly like a conventional absorber to make the same density and composition ratio of the entire absorbent core of the absorber 5. If necessary, it is made of synthetic fiber 13 in order to quickly absorb and diffuse the liquid in the upper layer located on the liquid permeable upper sheet 6 side and to prevent the liquid from flowing back by any pressure. It is made of a layer, the down pulp 11 and the synthetic fiber 13 and the absorbent is weak but strong gel strength when absorbed by the even distribution of a super absorbent resin (12) that can quickly deliver the absorbed liquid to the lower portion It is also possible to form a layer, evenly distributed down the pulp pulp 11, synthetic fibers 13 and the superabsorbent polymer 12 having excellent water retention in the lower layer.

The configuration of the absorber 5 can be implemented in the ultra-thin disposable diaper that is easy to be applied in the process while maintaining the shape while using a small amount of fluffy pulp 11 and superabsorbent resin 12.

Hereinafter, the present invention will be described in detail with Examples and Comparative Examples.

Example 1

Ultra-thin disposable diapers were prepared as follows.

A disposable diaper is produced in which the liquid permeable topsheet 6 and the liquid impermeable backsheet 4 and the topsheet 6 and the backsheet 4 are made of the absorbent body 5, wherein the absorbent body 5 is made of downy pulp. (11) and the superabsorbent resin (12), synthetic fibers (13) to form an absorbent core was formed by wrapping it with tissue (9).

That is, the absorber 5 is a super absorbent resin 12, 220 g / m 2 of HS-300V product of Songwon Industrial Co., Ltd., and 140 g / m 2 of JLDE Grade product of Rayonier, U.S.A. 5 mm, outer circumference is polyethylene resin, and the core is made of polypropylene resin, the core and sheath type bicomponent fiber (13) 20 g / ㎡ uniformly mixed and dispersed, and then it is bicomponent fiber at 150 ℃ The outer periphery of the melted pulp 11 and the synthetic fiber 13 or the synthetic fiber 13 and the synthetic fiber 13 to be bound to produce an absorbent core 1㎡ and 10cm, 40 cm Cut to size and wrapped with a tissue (9) having a basis weight of 16 g / ㎡.

Example 2

Except for the configuration of the absorber (5), ultra-thin disposable diapers having the same structure as in Example 1 were prepared as follows.

Here, the absorber (5) is a super absorbent resin (12), 220 g / m 2 of HS-701V product of Songwon Industrial Co., Ltd., and 100 g / m 2 of JLDE Grade product of Rayonier, USA, and 6 denier of 38 mm length as downy pulp (11). , 40 g / m 2 of synthetic fiber (13), a sheath-and-core type bicomponent fiber in the form of a sheath and core composed of polyethylene terephthalate resin, whose outer peripheral part is made of polyethylene terephthalate resin The outer periphery of the melted pulp 11 and the synthetic fiber 13 or the synthetic fiber 13 and the synthetic fiber 13 to be bound to produce an absorbent core 1㎡ and 10cm, 40 cm Cut to size and wrapped with a tissue (9) having a basis weight of 16 g / ㎡.

Example 3

Except for the configuration of the absorber (5), ultra-thin disposable diapers having the same structure as in Example 1 were prepared as follows.

Here, the absorbent (5) is a super absorbent resin (12), 220 g / m2 of HS-300S product of Songwon Industrial Co., Ltd. and fluffy pulp (11), 100 g / m2 of JLDE Grade product of Rayonier, USA, and 4 deniers, 10mm long. , 15 g / m 2 of synthetic fiber (13), a sheath-and-core type bicomponent fiber of the sheath and core type, whose outer peripheral part is polyethylene resin and the central part is composed of polyethylene terephthalate resin The outer peripheral portion of the melted pulp (11) and the synthetic fiber 13 or the synthetic fiber 13 and the synthetic fiber 13 to bind to produce an absorbent core 1㎡ and the basis weight 16g / ㎡ tissue (9 The upper and lower layers were formed into a sandwich structure, and cut into a size of 10 cm wide and 40 cm long.

Example 4

An ultra-thin disposable diaper having the same structure as in Example 1 was manufactured as follows except for the configuration of the absorbent body 5 in which the upper layer portion and the lower layer portion of the liquid-permeable top sheet 6 had different configurations.

Here, the upper part of the liquid permeable top sheet 6 side of the absorber 5 is a super absorbent resin 12 having enhanced spreadability and absorption rate, and 100 g / m 2 of HS-701S product of Songwon Industrial Co., Ltd. Onier's JLDE Grade product 70 g / m2, thickness 2 denier, length 3mm, outer periphery is polyethylene resin, and the core is a sheath-and-core type of herbaceous bicomponent fiber composed of polyethylene terephthalate resin (13) 10 g / m2 uniformly mixed and dispersed, the lower layer of the absorber (5) is a super absorbent polymer (12) with increased urinary force, 140 g / m2 of HS-300S product of Songwon Industrial Co., Ltd. and Rayon USA as downy pulp (11). 10 g of synthetic fiber (13), which is a sheath-and-core type bicomponent fiber of 70 g / m2, 6 mm denier, 5 mm in length, outer peripheral part of polyethylene resin, and a core of polyethylene terephthalate resin Of After uniformly mixing and dispersing the melted outer periphery of the two-component fiber at 160 ℃ to bind the down pulp 11 and the synthetic fiber 13 or the synthetic fiber 13 and the synthetic fiber 13 absorbent core 1 After the production of the m 2 was cut to a size of 10 cm wide, 40 cm long and wrapped with a tissue (9) having a basis weight of 16g / ㎡ was produced.

Example 5

Except for the configuration of the absorber (5), an ultra-thin disposable diaper having the same structure as in Example 4 was prepared as follows.

Here, the upper part of the liquid permeable top sheet 6 side of the absorbent body 5 is a super absorbent resin 12 having enhanced spreadability and absorption rate, and is 50 g / m 2 of HS-701S product of Songwon Industrial Co., Ltd. and fluffy pulp (11). Onier's JLDE Grade product 70 g / m2, thickness 4 denier, length 5mm, outer periphery is polyethylene resin, and the core is a sheath-and-core bicomponent fiber composed of polyethylene terephthalate resin (13) 10 g / m2 uniformly mixed and dispersed, the lower layer of the absorber (5) is a super absorbent polymer (12) with increased urinary force, 180 g / m2 of HS-300S product of Songwon Industrial Co., Ltd. and Rayon USA as downy pulp (11). 10 g of synthetic fiber (13), which is a sheath-and-core type bicomponent fiber of 70 g / m 2 of Ursa's product, 2 denier in thickness, 3 mm in length, outer peripheral part of polyethylene resin, and the center of which is composed of polyethylene terephthalate resin Of After uniformly mixing and dispersing the melted outer periphery of the two-component fiber at 150 ℃ to bind the downy pulp (11) and synthetic fibers (13) or synthetic fibers (13) and synthetic fibers (13) absorbent core 1 After the production of m 2, the upper and lower layers were formed into a sandwich structure with tissues 9 having a basis weight of 16 g / m 2, and then cut into sizes of 10 cm and 40 cm.

Comparative example

Ordinary disposables including a liquid permeable topsheet 6 and a liquid impermeable backsheet 4, an absorbent body 5 between the topsheet 6 and the backsheet 4, fastening means and an elastic body portion for giving a fit It is a diaper, and the absorbent body 5 is composed of a super absorbent resin 12, a fluffy pulp 11, and a tissue 9, and as a super absorbent resin 12, 200 g / m2 of HS-300V product of Songwon Industrial Co., Ltd. and fluffy pulp (11), uniformly mixed and dispersed in 270 g / ㎡ JLDE Grade products of Rayonier, USA to prepare an absorbent core 1 ㎡ and cut it into a size of 10 cm horizontal, 40 cm vertical tissue 16g / ㎡ ( A conventional conventional disposable diaper wrapped by 9) was used as a comparative example.

The superabsorbent polymer 12, which is a product of Songwon Industrial Co., Ltd., used for the absorbent body 5 in the conventional diaper according to the present invention ultra-thin disposable base prepared by Examples 1 to 5 and a comparative example, is shown in Table 1 below. It is having SAT.

Water-retaining ability of super absorbent polymer division Water-retaining capacity of super absorbent polymer (g / ㎠) HS-300V HS-701S HS-300S Example 1 34 Not applicable Not applicable Example 2 Not applicable 24 Not applicable Example 3 Not applicable Not applicable 38 Example 4 Not applicable 24 38 Example 5 34 24 Not applicable Comparative example 34 Not applicable Not applicable

The physical properties of the ultra-thin disposable diapers of the present invention prepared by Examples 1 to 5 and the conventional diapers shown in Comparative Examples were evaluated and the results are shown in Table 2 below.

The physical properties were evaluated for "permeation time for physiological saline", "surface dryness for physiological saline", "water retention per unit area for physiological saline", "thickness of the product" and "structural stability".

The permeation time evaluation for physiological saline was measured by adding 40 ml of physiological saline to each of the diapers of Examples 1 to 5 and the diaper of Comparative Example to measure the time (seconds) at which the physiological saline was absorbed into the absorber on the surface. After about 30 minutes at the same site, the permeation time was measured again in the same manner as above, and is shown in Table 2. At this time, the lower the measured values once and twice, the better the rate of absorption for physiological saline.

The surface dryness evaluation of physiological saline (Wet-Back) measured the amount of physiological saline re-injected again, 150 ml of physiological saline was added to each of the diapers of Examples 1 to 5 and the comparative example was absorbed. Next, after leaving at room temperature for 10 minutes, five sheets of filter paper were placed on the physiological saline input part of the product, pressurized at 3.6 kg / 10 ㎠ for 2 minutes, and then the amount of the filter paper was measured and the results are shown in Table 2. . The lower the measured value at this time was evaluated to be excellent surface dryness.

Evaluation of water retention per unit area for physiological saline was performed by dipping the diaper of Example 1 to Example 5 and the diaper of Comparative Example in a tank containing physiological saline for 10 minutes, and then leaving it on a wire net for 5 minutes to prevent absorption. After brine was distilled off, it was centrifuged for 5 minutes in a centrifuge (commercial rotary dehydrator, 1,400 rpm). Thereafter, the amount of physiological saline repaired in the evaluation sample was measured to calculate the water capacity per unit area, and the results are shown in Table 2.

To evaluate the thickness of the product, the diapers of Examples 1 to 5 and the diapers of Comparative Example were cut out to a size of 10 cm × 10 cm to prepare a sample, and the thickness was measured using a digital thickness meter manufactured by Mitutoyo. The results are shown in Table 2.

Structural stability evaluation was performed by evaluating the absorbents of each of the diapers of Examples 1 to 5 and the diapers of the comparative example into a rectangle of 2 cm × 10 cm as an evaluation sample for the static dropout property and the vertical suspension retention of the superabsorbent polymer. 2, 2 cm squares of Petri dishes were placed at intervals of about 2 cm, and 50 ml of physiological saline was added and allowed to stand for 10 minutes to swell the superabsorbent polymer, followed by swelling. The state in which the absorbent resin was peeled off and dropped into the liquid was visually evaluated, and the results are shown in Table 2.

In addition, the vertical suspension retaining ability is directly taken out of the sample after the above-mentioned static maintenance drop-off evaluation with a tweezers, and the peeled off state from the absorber of the superabsorbent polymer swelled vertically by grasping one end in the longitudinal direction with a clip and visually evaluated. The results are shown in Table 2.

Physical property evaluation of disposable diapers Kinds Liquid permeation time Surface dryness Conservative thickness Structural safety 1 time Episode 2 Political sustainability Vertical Sustainability unit Seconds / 40 ml Sec / 80 ml g / 150 ml g / piece mm none none Example 1 28 29 0.3 320 1.9 ◎ ◎ Example 2 16 19 0.2 240 1.7 ◎ ◎ Example 3 30 35 0.2 360 2.5 ◇ ◇ Example 4 18 20 0.1 355 2.2 ◎ ◇ Example 5 21 22 0.2 335 2.0 ◎ ◎ Comparative example 32 41 0.3 320 5.2 △ △

Note 1) Evaluation criteria for political maintainance

(Double-circle): Peeling drop was hardly seen, even if a super absorbent polymer swells.

◇: Dropout appeared slightly due to swelling of the super absorbent polymer.

(Triangle | delta): Dropping was clear by the swelling of superabsorbent polymer.

X: Dropping was large due to swelling of the super absorbent polymer, and deposited in the liquid.

Note 2) Evaluation Criteria for Vertical Sustainability

(Double-circle): Peeling off of the swollen superabsorbent polymer was hardly confirmed.

◇: The surface layer portion of the swollen superabsorbent polymer was slightly dropped.

(Triangle | delta): In the swollen superabsorbent resin, what was in the surface layer was partially dropped, but was retained in the part which is in direct contact with the absorber.

X: The swollen superabsorbent resin mostly fell off from the absorber and dropped off.

As can be clearly seen from Table 2, the disposable diaper products of the present invention (Examples 1 to 5) manufactured by employing synthetic fibers in the absorber have a smaller amount than the conventional disposable diaper products (comparative example). It could be confirmed that the absorbent structure can be formed by employing fluffy pulp, and exhibited more than equivalent penetration time, water retention, and surface dryness compared to the conventional diaper, and in particular, the thickness and structural stability were excellent.

As described above, the present invention adopts a synthetic resin in the absorber to quickly absorb and store the body fluid even if the thickness of the downy pulp and super absorbent resin is greatly reduced, and absorbed even when pressed by the human body and external pressure in the stored state. And it can effectively prevent the phenomenon of discharging (backflow) the stored body fluid back to the human body, and it is thin and light by the drastic reduction of the amount of fluffy pulp, so it is easy to carry and there is no agglomeration phenomenon. Because of the small volume, the large volume can be packed in a small volume, thereby reducing the logistics cost such as transportation cost or storage cost, thereby reducing the price of the product.

Claims (4)

Liquid-permeable topsheet 6 that is in direct contact with the wearer's skin when worn, and liquid-impermeable backsheet 4 that forms an outer surface when worn, and an absorber positioned between the topsheet 6 and backsheet 4 (5) and a disposable diaper having fastening means, characterized in that the absorbent body (5) is made of a downy pulp (11), a super absorbent polymer (12), and a synthetic fiber (13). 2. The absorbent body (5) according to claim 1, wherein 18 to 45% by weight of the downy pulp (11), 50 to 80% by weight of the super absorbent polymer (12), and 2 to 30% by weight of the synthetic fiber (13). Ultra-thin disposable diaper, characterized in that made by melting the outer periphery of the synthetic fiber 13 to form an absorbent core at 135 ~ 165 ℃ after dispersing, wrapped with a tissue (9). The ultra-thin disposable diaper according to claim 2, wherein the synthetic fiber (13) is a single fiber of polyethylene, polypropylene, polyester, polyamide, rayon, polyurethane, or a composite fiber of at least two. The method according to claim 2 or 3, wherein the synthetic fibers 13 are long fibers or crimped short fibers through direct spinning or a mixture thereof, the fibers having a thickness of 1 to 10 deniers and a length of 3 to 60 mm. Ultra-thin disposable diaper which is characterized by the above-mentioned.