KR100436987B1 - The light weight acquisition distribution a nonwoven fabric and manufacturing process of a diaper and sanitary napkin - Google Patents

Abstract

The present invention relates to an absorbent dispersion nonwoven fabric of absorbent articles such as disposable diapers and sanitary napkins, and a method for manufacturing the absorbent article, which comprises a surface nonwoven fabric, a dispersed absorbent layer, a leakproof nonwoven fabric, an absorbent polymer layer, a fluffy pulp, and a backsheet.

Delayed delivery of absorbents that absorb and retain repeated body fluids, such as urination and blood, delays the delivery of urine and blood into clumping bands or wings, which are means for preventing leakage on the absorber side. In order to prevent the leakage of water, the dispersion absorbing layer has a weight of 20-25 g / m 2 and has a bulky structure in which 60% or more of the fibers are arranged in the longitudinal direction.

In addition, by raising the formed by the carding process to the inclination angle of 45 ° and supplied with an angle of 110-140 ° and then bonded by hot air in the heating chamber, by maintaining the incidence angle by maintaining the fiber in the height direction The deformation can be formed into a three-dimensional structure without three-dimensional deformation by heat, and to provide a non-woven fabric and a method for manufacturing the non-woven fabric produced through 30-50% stretching in a continuous process.

Description

The light weight acquisition distribution a nonwoven fabric and manufacturing process of a diaper and sanitary napkin}

The present invention provides a low-weight absorbent dispersion nonwoven fabric and disposable method for disposable diaper sanitary napkins by designing the weight of the dispersion absorbing layer at a low weight of 20-25 g / m 2 and at the same time giving bulkiness and arranging fibers in the longitudinal direction. It is about.

As is well known, absorbent products such as disposable diapers or sanitary napkins include surface top sheets (1), dispersion absorbent layers (2), leakproof nonwoven fabrics (3), absorbent polymer layers (4), fluffy pulp (5) and bags. It consists of a back sheet (6),

Although the liquid passing through the surface nonwoven fabric 1 was quickly absorbed by the absorbent polymer layer 4 in the absorbent wick, the liquid did not disperse over the entire surface area and tended to be concentrated at a part. This is a result of the absorption ability is much better than the dispersing ability, and since the first leaked urine or blood is already absorbed in the absorbent polymer layer (4), this part is already saturated, and the continuously drained urine or blood is concentrated in this part and elsewhere. As it was not able to move to, the liquid, pulp, and absorbent polymers were mixed to form gels, and they had a possibility of leakage.

In addition, the development of ultra-thin disposable products reduces the amount of fluff pulp (5), using a large number of superabsorbent resin (SAP) while using a non-woven fabric having a collective dispersion function under the surface nonwoven fabric (1) and absorbs, The nonwoven fabric (ADL) of gathering and dispersing function is generally higher than 18-26g / m2, which is the weight of the surface nonwoven fabric 1, by using a weight of 35-120g / m2, and there is room for improvement. Due to the problem that low weight is not possible.

The present invention is to prevent the occurrence of leakage in the gap of the leg portion is reduced the adhesion of the woman's sanitary napkin or baby diaper through the immediate absorption of the liquid, rapid dispersion to solve the above-mentioned problems, and the adhesion to the human body It is meant for. Conventional dispersion absorbing layer having a weight of 35-120g / ㎡ usually has a bulky structure (bulky) and the fiber arrangement is made of a random form.

However, the weight of the dispersion absorbing layer of the present invention to give the bulky property at a low weight of 20-25g / ㎡ to exhibit the same performance as the conventional products of high weight and to improve the dispersion effect of body fluid by arranging the fiber array in the longitudinal direction more than 60% If described in detail with the accompanying drawings as follows.

1 is a schematic cross-sectional view of a well-known diaper, sanitary napkin

2 is a schematic view showing a manufacturing process of a conventional diaper sanitary napkin

Figure 3 is a schematic diagram showing a manufacturing process of the diaper, sanitary napkin according to the present invention

Figure 4a, 4b is an illustration showing the orientation of the nonwoven fabric,

4a is an exemplary view showing a conventional fiber orientation.

4b is an exemplary view showing a fiber orientation state of the present invention.

<Description of the symbols for the main parts of the drawings>

1. Surface nonwoven fabric 2. Dispersion absorbing layer 3. Leakproof nonwoven fabric

4. Absorbent Polymer Layer 5. Fluffy Pulp 6. Backsheet

7.7a web 8.8a heating chamber

In the accompanying drawings, Figure 1 is a schematic cross-sectional structure of a well-known diaper, sanitary napkin,

Figure 2 is a schematic diagram showing a manufacturing process of a conventional diaper sanitary napkin,

Figure 3 is a schematic view showing a diaper, sanitary napkin manufacturing process according to the present invention,

Figure 4a.4b is an illustration showing the orientation of the nonwoven fabric.

In other words, as is well known, absorbent products such as disposable diapers, sanitary napkins, etc. are surface nonwoven fabric (1), dispersion absorbing layer (2), leakage preventing nonwoven fabric (3). It consists of absorbent polymer layer (4), downy pulp (5) and backsheet (6), and body fluid secreted from the human body passes through the liquid permeable surface nonwoven fabric (1) and quickly passes through the dispersion absorbing layer (2). The liquid permeable surface nonwoven fabric (1), which is absorbed by the polymer layer (4) and downy pulp (5), absorbs and retains the body fluid to prevent the absorbed body fluid from contacting the skin again, but the hydrophilic liquid permeable surface nonwoven fabric (1) is subjected to repeated urination. As the surface becomes hydrophobic and the non-woven fabric has a low dirt, delay in delivery to the absorber of urination and blood, urination and blood are collected in a clot band or wing, which is a means of preventing leakage on the side of the absorber, and the gap between the legs where the adhesion to the human body decreases. Leaks and cause bark in the baby's hips

The conventional method of manufacturing the absorbent and disperse nonwoven fabric is to form a web (7) through a carding process using polyolefin-based short fibers as shown in FIG. It bonds the web 7 as heating air by supplying it to the heating chamber 8, but since the web 7a is simply moved into the heating chamber, the orientation of the constituent fibers is not aligned. 4a has a random shape as shown in FIG. 4a, so the amount of absorption according to the unit weight is small and the adsorption rate is low.

In the present invention, the web 7a formed through the carding process using the polyolefin-based short fibers is raised to an inclination angle of 45 ° as shown in FIG. It is supplied with% stretching and bonded with heating air in a heating chamber. If the elongation is less than 30%, the orientation of the fiber is lowered. If the elongation is over 50%, the nonwoven fabric becomes too thin to decrease strength and water content. It is losing, and by zipping in the advancing direction of the web 7a, the orientation of the constituent fibers is increased, and the degree of orientation is increased to 60% or more. If the supply angle is less than 110 degrees, the web 7a is supplied close to the vertical, so that it is difficult to draw by needles, and if it is more than 140 degrees, the needles of the needles penetrate deeply into the webs 7a. So it did not sojeul will have poor failure to facilitate orientation of the fibers act.

Example (A diaper was performed as an example for convenience.)

Example 1

Conventional diapers were prepared using the liquid permeable absorbent, dispersion layer 20 g / m 2 composed of bi-component 6 denier yarns composed of polyethylene / polyester between the liquid permeable surface nonwoven fabric and the absorbent body. .

Example 2.

In Example 1, a conventional diaper was prepared using a liquid permeable absorbing dispersion layer 25 g / m 2 under the liquid permeable surface nonwoven fabric.

Example 3.

In Example 1, a diaper was prepared using 28 g / m 2 of a liquid permeable absorbing dispersion layer formed by mixing 6 denier bicomponent yarns and 4 denier release cross-section yarns under a liquid permeable surface nonwoven fabric at a ratio of 5: 5.

Comparative Example 1.

In Example 1, a conventional diaper was prepared using a conventional nonwoven fabric of 55 g / m 2 of a liquid permeable absorbing dispersion layer of 4 denier yarn under the liquid permeable surface nonwoven fabric.

Comparative Example 2.

In Comparative Example 1, a conventional diaper was prepared using a liquid permeable absorbing, two-denier yarn, conventional nonwoven fabric having a dispersion layer of 20 g / m 2 under the liquid permeable surface nonwoven fabric.

Table 1 shows the results of evaluating the rate of urine absorption, leakage and thickness between the Example product and the Comparative Example product, and the Example has a faster rate of urine absorption than the Comparative Example, and the difference becomes more pronounced especially at the third time. In addition, in the case of Comparative Example 2 designed at a low weight in the conventional manufacturing method it can be seen that the urine absorption rate is significantly slowed to perform the function. As a result of performing a consumer test on the occurrence of leakage from the mother of the baby while the disposable diaper is worn, the product of the present invention is superior to the case of the low weight design of the conventional product and the conventional manufacturing method. Shows.

In addition, it can be seen that the product of the present invention also secures the same numerical value as that of a normal product while achieving a low weight even in thickness.

Table 1 Comparison of Characteristics between Example Product and Comparative Example Product

Absorption rate (sec / 10mL) Outbreaks (consumer survey) thickness Primary Secondary 3rd Example 1 2.3 3.1 3.5 Excellent 0.24 Example 2 2.3 3.0 3.5 Excellent 0.25 Example 3 2.4 3.0 3.4 Excellent 0.27 Comparative Example 1 2.5 3.0 3.9 Great 0.24 Comparative Example 2 5.1 7.2 8.6 usually 0.16

Spring occurrence judgment contents

Excellent: 90% or more when there is no leakage

Excellent: 70 ~ 90% of no leakage occurred when using

Normal: Less than 70% of cases have no leakage

According to the present invention, the dispersion absorbing layer is raised at an angle of inclination of 45 ° and then supplied with an angle of 110-140 °, and then bonded by hot air 30-30% stretching in a heating chamber. It has a weight of ㎡ and arranges bulky structure and fiber array more than 60% in the length direction, and it is effective to prevent leakage due to concentration of blood or urine continuously by dispersing and absorbing blood and urine repeatedly. . .

Claims (4)

correction A low weight absorptive dispersion nonwoven fabric for disposable diapers and sanitary napkins, wherein the low weight absorptive dispersion nonwoven fabric uses short polyolefin-based fibers and the constituent fibers are oriented and have a low weight of 20-25 g / m 2. delete correction The method according to claim 1, A low-weight absorbing nonwoven fabric for disposable diapers and sanitary napkins, characterized in that the constituent fibers of the nonwoven fabric have an orientation of at least 60% in the longitudinal direction. newly open In the method of manufacturing a low-weight absorbent dispersion nonwoven fabric for disposable diapers and sanitary napkins, the polyolefin-based short fiber web formed through the carding process is raised to an inclination angle of 45 ° and then the supplying sachet is maintained while maintaining an angle of 110-140 °. A method of manufacturing a low-weight absorbent dispersion nonwoven fabric for disposable diapers, sanitary napkins, characterized in that 30-50% elongation and bonding with heated air in a heating chamber.