KR100380026B1 - Disposable diaper - Google Patents

Abstract

The present invention relates to a disposable absorbent article in which a liquid-impermeable backsheet is embossed to a certain depth and a predetermined size so that the liquid-impermeable backsheet can serve as a second fixing member. An impermeable back sheet 4, a body portion including an absorbent body 1 positioned between the top sheet 8 and the back sheet 4, and a first waist region 19 and a second waist region 20 are provided. In a disposable absorbent article which is formed and further comprises a mechanical fastening means comprising a first fastening member 15 for closing the absorbent article in the first waist region 19, the backsheet 4 is arranged in a second manner. Embossing is formed to serve as a fixing member, the peeling strength between the back sheet 4 and the first fixing member 15 is 100 to 600g / 25mm, the shear strength 500 when pulled to the side To 3,000 g / 25 mm.

Description

Disposable Absorbents {Disposable diaper}

The present invention relates to a disposable absorbent article in a disposable absorbent article that does not include a separate second fixing member, i.e., a landing member, and wherein the liquid impermeable backsheet functions as a second fixing member. More specifically, the present invention relates to a disposable absorbent product that is embossed to a certain depth and a certain size so that the liquid impermeable back sheet can serve as a second fixing member.

In general, disposable absorbent products are products that absorb body fluids excreted by physiological action, that is, products that absorb urine and feces. More specifically, diapers used by infants, diapers used by incontinents ( adult diaper, and sanitary napkins.

Disposable absorbent products, except for women's sanitary napkins, include a liquid impervious back sheet 4 and a liquid permeable top sheet 8, an absorber 1 interposed therebetween absorbing the wearer's feces, and the wearer's thigh. Barrier cuff to improve, and finally prevent leakage of excretion, and improve the appearance image may include a leg band (leg band) (11) to prevent side leakage. The rotting band 5 is usually formed along the edge 17. It includes a waist band and a closure system for improving the fit of the waist. In addition, the waistband may be generally divided into a front waistband 12 and a back waistband 13.

The absorber 1 is typically made of fluffy pulp 6, a super absorbent polymer 7 (SAP; super absorbent polymer), a tissue 10, and the like, and a liquid permeable top sheet 8 Absorbs the excrement passing rapidly) and retains the absorbed excreta to prevent it from contacting the skin again.

As the liquid permeable top sheet 8, a synthetic nonwoven fabric 2 or a film having a hole is used so that the body fluid can pass quickly into the absorbent body 1. As the synthetic nonwoven fabric 2, in order to quickly deliver the body fluid to be absorbed by the absorbent body 1, a hydrophilic treatment is usually applied to hydrophobic fibers.

The liquid impervious back sheet 4 functions to prevent body fluids absorbed by the disposable absorbent product from leaking under the absorbent body 1 and contaminating the wearer's clothing or the surrounding environment, and mainly uses a polyethylene film. The nonwoven fabric 2 may be bonded to the film to improve the softness of the material.

Thus, the absorbent article consisting of the liquid permeable top sheet 8, the absorbent body 1, and the liquid impermeable backsheet 4 further includes a fastening means so as to be worn and maintained on the body. In addition, each material is bonded and fixed by hot melt adhesive, heat fusion or other bonding method.

Disposable absorbent products, namely baby diapers, incontinence diapers, and feminine sanitary napkins, have been described as having a user's discomfort in terms of their basic performance in terms of the rate and absorption of absorbing body fluids ejected by physiological action. Adjustable so that it is not possible.

The development of disposable absorbent products is progressing in the direction of improving wearability in order to meet basic performance, and as one method for this, ultra-thin disposable absorbent products that have made the absorber 1 thinner have been developed. One easy way to make an ultra-thin disposable absorbent product is to use a small amount of fluffy pulp 6 that takes up a large volume, and to use a super absorbent resin 7 a lot.

In such ultra-thin disposable absorbent products, users are most dissatisfied with the occurrence of leakage, sores, and anxiety of the adhesion system.

The glands may be used for a long time by wearing a disposable absorbent product when the ratio of the mixed content of the downy pulp (6) and the super absorbent polymer (7) in the ultra-thin disposable absorbent product is not appropriate, or disposable absorption when the wearer's activity or movement is severe. The initial absorbing state of the disposable absorbent product of the product is drooped below, and the absorbent body 1 decreases in width and the shape of the absorbent body 1 is deformed to cause a phenomenon of lumping or splitting. Therefore, the absorbent body 1 thus deformed has an incomplete absorbing function, which lowers usability and increases the possibility of leakage.

In addition, the absorbent body 1 deformed during use decreases the absorbed area, especially when the wearer's movement is severe and the absorbent product does not come into close contact with the wearer. The permeable topsheet 8 is hydrophilic, but the hydrophilic surface becomes hydrophobic due to repeated urination, which delays the transfer to the absorbent 1 during urination, thereby increasing the possibility of leakage in the modified absorbent 1.

In the use of disposable absorbent products, the most uncomfortable thing other than the basic quality of the above absorbency is the fixation system. The fixation system provides a fixation means to ensure that the disposable absorbent product is applied to the wearer when the disposable absorbent product is used.

The mechanical fixation system is proposed to compensate for the disadvantages of the conventional adhesive tape fixation system. The adhesive tape fastening system has the disadvantage that it is easily contaminated by oil and powder in contact with the adhesive located on the hook carrier 14, and the adhesive does not perform its role and falls easily. In addition, there is a problem in that the adhesion strength is reduced when repeatedly adhering and detaching the absorbent product in order to check whether the absorbent product is dirty or to find a suitable position during adhesion, and the outside, that is, the liquid impermeable back without being adhered to the second fixing system When adhered to the sheet 4, the back sheet 4 may fall off or torn, which may cause a hole in the back sheet 4, which may render the disposable absorbent product unusable. have.

Therefore, it is advantageous to provide a disposable absorbent article having a fixation system that is simpler to refix and that can be reused even after the absorbent article or fixation system has been removed once.

Mechanical fixation systems are typically not easily contaminated by oil and powder and provide a fixation system that is easier to reposition compared to adhesive tape fixation systems, but with a first fixation system and a second fixation system that can engage therewith. This must exist.

A hook, typically a first fixation system, is located at the distal end of the first waist region 19 and a second fixation member is located at the distal end of the second waist region 20 of the single absorbent article. Therefore, in order to use the absorbent product, the first fixing member must be fixed to the second fixing member. If it is attached to an area other than the second fixing member, that is, when it is attached to the liquid impermeable back sheet 4, the fiber separated from the back sheet 4 on the hook due to tearing or severe lint occurrence The problem is that the fibers are entangled. In the case of a disposable absorbent product, the fixing is performed by a third person rather than the user, and there may be a problem that it is difficult for the third person to accurately fix the first fixing member 15 to the second fixing member due to the severe movement of the user.

The present invention allows the liquid impermeable back sheet 4 to act as a second fixing member in order to improve the adhesion problem between the first fixing member 15 and the second fixing member of the conventional disposable absorbent article. The ash is fixed to the exposed side of the absorbent article, in particular the backsheet 4. Thus, the back sheet 4, which serves as the second fixing member, allows the nonwoven fabric 2 to have a strong fiber bonding force and embossing of a suitable depth and size to serve as a landing member.

It is an object of the present invention to provide a disposable absorbent article having an improved fixation system.

Another object of the present invention is to provide a disposable absorbent article that is embossed to a certain depth and a certain size so that the liquid impermeable back sheet can serve as a second fixing member.

1 is a plan view showing an expanded state of a disposable absorbent product according to the present invention.

FIG. 2 is a partial cross-sectional view taken along the line II ′ of FIG. 1.

Figure 3 is a rear view showing an unfolded state of the disposable absorbent product according to the present invention.

Figure 4 is a perspective view showing a wearing state of the disposable absorbent article according to the present invention.

Figure 5 is a schematic diagram schematically showing a process of embossing when manufacturing the back sheet of the disposable absorbent article according to the present invention.

Figure 6 is a schematic diagram showing an embossed shape by partially expanding the back sheet of the disposable absorbent article according to the present invention.

Figure 7 is an enlarged schematic view showing a partially cut back sheet of the disposable absorbent article according to the present invention.

Figure 8 is a schematic diagram schematically showing a manufacturing process of the back sheet of the disposable absorbent article according to the present invention.

Explanation of symbols on the main parts of the drawings

1 absorber 2 nonwoven fabric

3: waterproof film 4: back sheet

5: curd band 6: fluffy pulp

7: super absorbent polymer 8: top sheet

9: solidified band elastic body 10: tissue

11: leg band 12: front waist band

13: back waistband 14: hook carrier

15: first fixing member 16: finger tab

17: end edge 18: terminal edge of the first waist region

19: first waist area 20: second waist area

21: terminal edge of the second waist region

22: heated embossing roll

1 and 2, the disposable absorbent article according to the present invention comprises a liquid permeable topsheet, a liquid impermeable backsheet, a body portion comprising an absorbent body positioned between the topsheet and the backsheet and a first waist In a disposable absorbent article comprising a region and a second waist region and comprising a mechanical fastening means comprising a first fastening member for closing the absorbent article in the first waist region, the backsheet is formed of the second fastening member. Embossing is formed to perform the role, the peeling strength between the back sheet and the first fixing member is 100 to 600g / 25mm, the shear strength, which is the force when pulled to the side is made 500 to 3,000g / 25mm .

The first fixing member is positioned to be in the first waist region.

The first fixing member positioned in the first waist region is positioned on a hook carrier stacked with a nonwoven fabric and a waterproof film.

The back sheet is formed by laminating a breathable film and a nonwoven fabric.

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

Disposable absorbent articles according to the present invention comprise a body comprising a liquid permeable topsheet 8, a liquid impermeable backsheet 4, and an absorber 1 positioned between the topsheet 8 and the backsheet 4. A first and second waist region 19 and a second waist region 20 are formed, and mechanical fastening means comprising a first fixing member 15 for closing the absorbent product in the first waist region 19. In the disposable absorbent product comprising a, the back sheet 4 is embossed to serve as the second fixing member, the peeling strength between the back sheet 4 and the first fixing member 15 is 100 To 600 g / 25 mm, characterized in that the shear strength, which is a force when pulled to the side, is 500 to 3,000 g / 25 mm.

1 is a plan view of a disposable absorbent article of the present invention. Disposable absorbent products have an hourglass-type appearance divided into a second waist region 20, a crotch portion, and a first waist region 19 in which the first fixing member 15 is installed. The appearance of the disposable absorbent article does not necessarily have to be symmetrical in left and right and front and rear, but preferably has a symmetrical structure.

In FIG. 1, it is shown that the first fixing member 15 is installed in the first waist region 19.

Figure 2 is a partial cross-sectional view showing a cross-sectional structure cut by the line II 'in the crotch portion of FIG.

3 is a rear view showing the liquid impermeable backsheet 4 side of the disposable absorbent article of the present invention. The liquid impermeable back sheet 4 of the disposable absorbent article of the present invention is characterized in that embossing is performed. Further, the liquid impermeable back sheet 4 is composed of a nonwoven fabric 2 made of polypropylene and a film made of polyethylene.

Figure 4 is a perspective view schematically showing a wearing state of the disposable absorbent article of the present invention. It is shown that there is no second fixing member, that is, a landing member, which is found in a conventional disposable absorbent product, and the first fixing member 15 is directly attached to the back sheet 4.

Fig. 5 shows a method for manufacturing the back sheet 4 used in the disposable absorbent article of the present invention. It is shown to form embossing on the back sheet 4 surface with a heating embo roll 22 for embossing.

6 shows the enlarged embossing of the back sheet 4. The shape of the embossing is in the form of a diamond, and maintains a certain shape, a certain interval and a certain depth. Of course, the shape of the embossing can be formed in a form other than diamond form.

In FIG. 7, the cross section of the back sheet 4 is shown, and the shape of the embossing is shown by the side cross section.

FIG. 8 is a process diagram schematically illustrating a process of spunlaid formation, lamination with a film, embossing, and the like starting from the polymer material forming the nonwoven fabric 2.

The present invention inserts the absorber (1) between the liquid impermeable backsheet (4) and the liquid permeable top sheet (8) and fixes it using a hot melt adhesive, and solidifies with leakage preventing means on the left and right sides outside the absorber (1). The band 5 is formed so as to form a pocket that primarily confines the body fluid which is separated from the absorbent body 1. The liquid impermeable back sheet 4 is generally composed of a nonwoven fabric 2 and a waterproof film 3. The body fluid leaving the absorber 1 and the coagulation band 5 still has a possibility of leaking from a pocket formed by the coagulation band 5 and the absorbent body 1, and the like. By forming a secondary pocket by the leg band (11), to close to the body of the user wearing a disposable absorbent product to reduce the possibility of leakage occurs. A solid band elastic body 9 is usually used for this solid band 5.

Disposable absorbent products are applied to the user's body after applying the fastening means to maintain the absorbent product in a certain form on the user's body and to apply a waistband to enhance the function of the disposable absorbent product or to have an additional effect. do.

The waistband is formed by adhering an elastic body to the distal edge of the first waist region 19 and the distal edge 21 of the second waist region 20 of the disposable absorbent article, and the length (parallel to the longitudinal center line) is two. The portion may be the same, or the portion of the first waist region 19 may be formed longer due to the nature of the function. Generally, the waistband is mainly made of polyurethane foam, polyurethane film, or polyethylene film ( polyethylene film), and a polyurethane elastic body or an elastic yarn may also be used, and as the elastic yarn, polyurethane spandex or natural rubber is used.

The mechanical fixation system of the present invention is useful and effective when applied to disposable absorbent articles. Conventional fastening means mainly form a landing member in front of the absorbent article of the second waist region 20 of the disposable absorbent article, so that the absorbent article is firmly fixed at the side. The disposable absorbent article of the present invention is characterized in that the liquid impervious back sheet 4 is provided with its function so as to engage with the first fixing member 15 without forming the landing member. The first fixing member 15 is formed to be located in the first waist region 19. The first fixing member 15 may support itself, but generally supports the hook carrier 14 to perform its function. As the material used for the hook carrier 14, a material laminated with polypropylene or polyethylene on the surface of the material of the nonwoven fabric 2 composed of polymer fibers is used. Alternatively, a material composed only of polypropylene may be used. In this case, although the feeling of use is slightly reduced, it can be expected to simplify the process or reduce raw material costs. The first fixing member 15 positioned in the first waist region 19 is positioned on the hook carrier 14 stacked with the nonwoven fabric 2 and the waterproof film 3.

The first fixing member 15 is composed of a mechanical closure system, that is, a hook, and the hook can be purchased and used commercially provided by prominent manufacturers in Korea and abroad. . A typical absorbent product includes a second fixing member that can be engaged with the first fixing member 15. The second fixing member includes a knitted method or a polymer extrusion method using polymer fibers. It is often manufactured by the method. Polymer, polyester (polyethylene), nylon (nylon) and the like are mainly used.

The second fixing member used in the present invention is characterized in that the liquid impermeable back sheet 4 serves as the second fixing member without separately attaching the landing member. The liquid impermeable back sheet 4 does not pass liquid and is made of a thin polymer breathable waterproof film 3 and a nonwoven fabric 2 made of a polymer. Polyethylene is mainly used as the polymer breathable waterproof film 3, and a nonwoven fabric 2 such as a spun bond or a thermal bond of polypropylene may be used as the nonwoven fabric 2. The back sheet 4 is absorbed by the absorber 1, and serves to prevent the discharge of contained secretions from being discharged to the outside of the disposable absorbent product. It helps to keep the air flowing smoothly and to suppress odor and skin rash.

The back sheet 4 of the present invention should have breathability while serving as a second fixing member. Recently, the use of a breathable waterproof film (3) has become popular as the disposable absorbent product uses a non-breathable film and matters concerning the user's skin rash. Therefore, the back sheet 4 of the present invention is also manufactured by the lamination method of the breathable waterproof film 3 and the nonwoven fabric 2, the waterproof film 3 is responsible for the function of ventilation, the nonwoven fabric 2 is the first It has a function of maintaining the bonding force with the fixing member (15). The breathability of the back sheet 4 performs its function by forming fine pores by the addition of calcium carbonate (CaCO ₃ ) in roll forming technology through compression molding of the waterproof film 3 and the nonwoven fabric 2. Done. In the compression molding process of the waterproof film (3) and the nonwoven fabric (2), after the addition of calcium carbonate, the resulting rolls are stretched in both axes, ie, in the transverse or longitudinal direction, so that the calcium carbonate particles cannot grow like the polymers. This is to be formed.

Disposable absorbent product of the present invention is characterized in that the expansion of the function to the fastening system in addition to the basic function of imparting breathability of the back sheet 4 as described above, in order to perform the role of the landing member embossed on the back sheet (4) It is very important to form.

The back sheet 4 of the present invention should have the fiber binding energy (defiberation energy) as much as a conventional landing member, and applies a back sheet 4 having a certain depth, a predetermined interval and a certain size of embossing. 5 shows a process of embossing the bonding roll of the waterproof film 3 and the nonwoven fabric 2 for the embossing process. To form the embossing, it is important to set the temperature of the heating embo roll 22, the gap between the rolls, and the setting of the hydraulic press. In addition, the bonding force depends on the depth of the embossing, the depth of the embossing can be said to be determined by the equipment speed and the material of the nonwoven fabric (2) / waterproof film (3). 6 shows an embossing pattern, which can be shaped into a rhombus shape or a diamond shape. 7 is a partial cross-sectional view showing a cross section of the embossing.

The back sheet 4 should be coupled to the first fixing member 15, and when the user is fastened, the shear strength, which is a force when pulled to the side and 90 ° peel strength, is a known hook. And landing member must be functionally larger than the standard. Peel strength is 100 to 600 g / 25 mm, and shear strength is made to be 500 to 3,000 g / 25 mm. When the peeling strength is too small, less than 100g / 25mm, the first fixing member 15 and the second fixing member may be separated during use. On the contrary, when the peeling strength exceeds 600g / 25mm, the user may feel uncomfortable to detach. There may be drawbacks. Shear strength should be within the above range in a similar problem to the peeling strength. When the first fixing member 15 is attached to the back sheet 4 and detached again while having the peeling strength and the shear strength in the above range, the strength of the fiber should be weak so that it does not come out of the nonwoven fabric 2. . In other words, the function should be maintained while minimizing lint occurrence. In addition, the space between the fibers should also be appropriate so that the hooks can be combined well, that is, the hooks can be caught well between the fibers. This can be achieved by adjusting the bonding strength of the nonwoven fabric 2, which can be easily determined from the rule of thumb for those skilled in the art.

In FIG. 3, the back sheet 4 of the disposable absorbent article of the present invention is shown, and in FIG. 4, the user attaches the first fixing member 15 to the back sheet 4. As shown in FIG. It is a feature of the disposable absorbent article of the present invention that the first fixing member 15 can be attached to any part of the back sheet 4 without being attached to the landing member attached to the front surface of the existing disposable absorbent article. Therefore, the disposable absorbent product of the present invention is attached to the back sheet 4 in a state in which the absorbent product is rolled up even when disposed after being used by the user, so that the absorbent product is not loosened again and may be convenient for the user.

Hereinafter, the present invention will be described in detail by comparing specific examples with comparative examples. The following examples merely illustrate the invention in more detail, and do not limit the invention.

Example

In a diaper which is a conventional disposable absorbent article comprising a liquid permeable topsheet 8, a liquid impermeable backsheet 4, an absorbent body 1, a mechanical fastening means and a waist elastic part, the end of the first waist region 19. The first fixing member 15 was installed at the edge. The first fixing member 15 is attached to the hook carrier 14, the hook carrier 14 is a material in which the nonwoven fabric 2 and the polypropylene film are laminated, and the first fixing member 15 is a hot melt adhesive. Is attached to, so that the finger tab 16 is formed. Finger tab 16 is available commercially available from a typical tape manufacturer, and should be stable for shape maintenance.

The back sheet 4 is composed of a nonwoven fabric 2 and a waterproof film 3, and the back sheet 4 is combined with the first fixing member 15 to form a fastening system. The back sheet 4 should have compatibility with each other with the first fixing member 15, and should be easy to adhere, reattach, and detach. In addition, the back sheet 4 is treated by embossing at a predetermined interval, a predetermined depth and a predetermined shape. The peeling strength between the first fixing member 15 and the back sheet 4 should be 100 g / 25 mm or more, and the shear strength was 500 g / 25 mm.

Comparative example

In a diaper which is a conventional disposable absorbent article comprising a liquid permeable topsheet 8, a liquid impermeable backsheet 4, an absorbent body 1, a fastening means and an elastic part for giving a fit, the first waist region 19 And a waist band made of a polyurethane film in the second waist region 20. As a fastening means, a first fixing member 15 is provided in the first waist region 19 and a landing member as a second fixing member is provided in the second waist region 20 as a comparative example. .

The actual wearing satisfaction survey of the disposable diapers manufactured in the above Examples and Comparative Examples was carried out by the evaluation of actual consumer use for 100 consumers, the results are shown in Table 1 below.

In the evaluation of actual use of consumers, the evaluation method was actually used by babies weighing 10 to 15 kg, and the degree of ease of fastening of disposable diapers was evaluated as a 3-point evaluation, and the results are shown in Table 1 below.

division Wear Satisfaction Judgment + ± - Comparative example 72 17 11 usually Example 91 6 3 Very good * (+); It is very good to wear disposable diaper (±); It is good to wear disposable diaper (-); Disposable diapers are not very comfortable to wear * Excellent When (+) is 90% or more; More than 80% (+) usually; (+) Is above 70%

As shown in Table 1 above, consumer test was performed on the comparative example which is an exemplary product of the present invention and a conventionally known disposable diaper, and the wearability of the exemplary product was very excellent.

Therefore, the disposable absorbent product according to the present invention can be more conveniently fastened when the user tightens the absorbent product to the user even when the user is in an unstable posture or lying down, and is more effective and effective in improving appearance and function. Can be said to be very large.

Claims (4)

A liquid permeable top sheet, a liquid impermeable back sheet, a body portion including an absorber positioned between the top sheet and the back sheet, and a first waist region and a second waist region are formed, and the absorbent product is formed in the first waist region. In the disposable absorbent product comprising a mechanical fixing means comprising a first fixing member for closing the Embossing is formed so that the back sheet performs the role of the second fixing member, and the peeling strength between the back sheet and the first fixing member is 100 to 600 g / 25 mm and the shear strength 500 is the force when pulled to the side. Disposable absorbent product, characterized in that to be made to 3,000g / 25㎜. The method of claim 1, And said first fixing member is located in said first waist region. The method of claim 1, And the first fixing member positioned in the first waist region is positioned on a hook carrier laminated with a nonwoven fabric and a waterproof film. The method of claim 1, And said backsheet is laminated with a breathable film and a nonwoven fabric.