KR20040003466A - Method for manufacturing spanbond non-woven fabric having high rewet efficiency - Google Patents

Abstract

PURPOSE: Provided is method for manufacturing a spun bond non-woven fabric which has an excellent rewet prevention capacity, and a high absorption speed as an absorber. CONSTITUTION: A method of manufacturing the spun bond non-woven fabric comprises the steps of: forming a filament from a fused plastic resin; cooling and drawing the filament; forming a non-woven web by integrating and hot cohering the drawn filament; and coating an emulsion with a mixture of water and a surfactant onto the non-woven web, and drying it to make a spun bonded non-woven fabric. The emulsion is formed by mixing silastol PHP26 as the surfactant with water by 5-20wt.%. The oil pick up of the emulsion to the non-woven web is 20-40wt.%, and the add on level of the surfactant to the non-woven web after the drying of the emulsion is 0.3-1.0wt.%.

Description

Spunbond nonwoven fabric with excellent reflow prevention method {METHOD FOR MANUFACTURING SPANBOND NON-WOVEN FABRIC HAVING HIGH REWET EFFICIENCY}

The present invention relates to a method of manufacturing a spunbond nonwoven fabric having excellent reflow resistance, and in particular, it has a rapid absorption permeability and excellent rewet resistance of the liquid held in the absorbent, so that diapers, training pants, adult incontinence products, The present invention relates to a method for producing a spunbond nonwoven fabric having excellent reflow resistance, which can be usefully used in various absorbent articles such as hygiene absorbent articles such as feminine hygiene products, and absorbent drapes, underpads, medical wipers, and the like.

For example, in the case of an absorbent permeable body of a diaper, a short fiber heat-bonded nonwoven fabric has been used, and in recent years, the application of a spunbond nonwoven fabric which is a long fiber heat-bonded nonwoven fabric is gradually increasing. In the case of the short-fiber nonwoven fabric used as the absorbent permeable material of the sanitary material, the weight per unit area is mostly 20 to 22 g / m 2, and the span bond nonwoven fabric is 14 to 18 g / m 2.

However, the spunbonded nonwoven fabric used as an absorber has excellent absorption rate but is not excellent in reflow prevention and is mainly used for adult incontinence or pet underpad. Therefore, there is an urgent need for a spanbonded nonwoven fabric that can be used in products that require reflow prevention, such as for infants.

Accordingly, an object of the present invention is to provide a hygroscopic absorbent article such as a baby diaper, a training pant, an adult incontinence product, a feminine hygiene product and the like by providing a rapid absorption permeability and excellent rewet of the liquid retained in the absorbent body. Another object of the present invention is to provide a non-reflow spunbond nonwoven fabric which can be usefully used in various absorbent articles such as absorbent drape, underpad, medical wiper, and the like.

For example, an absorbent permeable body (hereinafter referred to as a top sheet) used in a baby diaper is required to have a strike-through time (sec) that is allowed to pass through the fluid applied to the top sheet in a vertical direction quickly. The surfactant attached to the surface of the nonwoven fabric is maintained without falling off due to the fluid being absorbed, and the absorbency of the vertical absorption rate is maintained, and the fluid transferred to the internal absorbent retainer is permeated back to the top sheet by the load of the infant and flows back. It should have characteristics such as low reflow prevention. Most of the inner absorbent retainer of the diaper consists of pulp and superabsorbent polymer particles which can retain fluid at least 20% of its own weight. The characteristics required for the topsheet of the diaper are the opposite of the vertical absorption rate and reflow prevention property.To satisfy these two characteristics, the type of absorbent applied to the long fiber spanbonded nonwoven fabric and the concentration of the absorbent applied per unit area of the nonwoven fabric The condition is very important.

In view of the above, in the present invention, as a hydrophilic treatment agent, silastol PHP26 (registered trademark) containing polydimethyl siloxane was used, and the mixing ratio of surfactant to water was used. Was 5-20 wt%. In addition, the impregnation amount (OPU: Oil Pick-Up) was 20 to 40 wt% based on the amount of emulsion applied to the long fiber nonwoven fabric, and the amount of the surfactant fixed to the long fiber spunbond nonwoven fabric after drying the impregnated emulsion ( AOL: Add On Level) was 0.3-1.0 wt%.

Here, the emulsion refers to a state in which the surfactant is dispersed in water, and the impregnation amount (OPU) is the weight of the emulsion coated on the nonwoven fabric (nonwoven web), A is the unit weight of the nonwoven fabric containing the emulsion, and B is untreated. The nonwoven fabric is defined by the following equation (1).

In addition, the AOL refers to the amount of moisture evaporated by drying in the emulsion applied to the nonwoven fabric and only the pure surfactant is attached to the nonwoven fabric, C is the unit area dry nonwoven fabric weight, and D is the nonwoven fabric weight after removing the surfactant. Is defined by the following equation.

As a method of removing the surfactant adhering to the nonwoven fabric, a solvent such as isopropanol, methanol, ethanol, or the like is impregnated with a dry nonwoven fabric, and then removed by placing in a round flask.

Looking at the process of manufacturing a spanbond nonwoven fabric according to the present invention, the melted plastic resin is melted and extruded into a plurality of orifices to form a filament, the filament is cooled by cooling air imparted from the cooling chamber to solidify the filament, The filament solidified by cooling is stretched to produce a stretched filament having a small fiber diameter. The fiber diameter of the stretched filament has an average diameter of 12-25 탆. Stretched filaments are formed into a nonwoven web by integrating into a continuously driven porous screen belt. Since the integrated nonwoven web does not have self-bonding, the shape stability of the nonwoven web is imparted by heat adhesion by applying heat and pressure through a thermal calender.

In the nonwoven fabric manufacturing process, the molten plastic resin is used in at least one component, and in one component, additives such as an antistatic agent, a colorant, and an antioxidant are included. One or more components means two components or multi components, and two components means that two or more polymers are formed into one fiber by extruding together from each extruder and spinning together.

These two-component fibers (for example, polyethylene and polypropylene) are dispersed in a sheath-core form consisting of different components inside and outside, and a side by side form divided into two components and one component dispersed in other components. Sea island forms may be employed. The distribution ratio of the two components may vary between 10/90 and 90/10 depending on the required properties.

The emulsion containing the surfactant is applied to the nonwoven web as described above. In this way, the emulsion containing the surfactant is applied to the nonwoven web. The roller is supplied continuously to the bath and rotates in the bath. Is a kiss roll method for impregnating an emulsion on an adherent web by contacting the nonwoven web, a spray method for spraying an emulsion, and a foam method for foaming an emulsion and applying it directly to the nonwoven web.

In the present invention, any of the above may be employed as a method of applying the emulsion to the nonwoven web. As a method of drying the nonwoven fabric in which the emulsion is applied to the nonwoven web, a method such as a hot air drum method, a cylinder contact drying method, or an IR method may be employed to evaporate moisture by heating the heat in an integrated manner.

<Example>

The present invention will be described in detail based on the following examples. First, the measurement and evaluation value of various characteristics in the following examples were analyzed by the method shown below.

Absorption rate

EDANA 150.3-96 NON-WOVEN COVERSTOCK LIQUID

Measurement was made using the STRIKE-THROUGH TIME method.

Reflow prevention

It was measured according to the EDANA 151.1-96 method.

In the following examples, the nonwoven web was produced with the basis weight of the polypropylene spunbond nonwoven fabric as 17 g / m 2, and the hydrophilic treatment was applied with a surfactant by the conventional kiss-roll method, and the interface The water, the activator solvent, was dried in a cylinder drum to evaporate. Such a hydrophilic treatment method or drying method is not limited. The surfactant was silastol piacchi 26 containing polydimethyl siloxane system, and the net concentration of the surfactant was 17%. This surfactant was mixed at 5-20 wt% with respect to water as a solvent. Excellent is 6 to 10 wt%. The amount of impregnation (OPU) in which the emulsion was applied to the nonwoven web was adjusted by the revolutions per minute of the kiss roll and was made 20 to 40 wt%. 30 wt% is excellent. After drying, the AOL content of the surfactant per unit area of the nonwoven fabric was 0.3 to 1.5 wt%, and it is preferably 0.5 to 0.8 wt%.

<Example 1>

A hydrophilic agent with a surfactant net concentration of 17% was mixed with water 6% and the OPU was 30. The absorption rate, reflow prevention and AOL values at this time are shown in Table 1 below.

<Example 2>

A hydrophilic agent with a surfactant net concentration of 17% was mixed with water 8%, and the impregnation amount (OPU) was 30. The absorption rate, reflow prevention and AOL values at this time are shown in Table 1 below.

<Example 3>

A hydrophilic agent with a surfactant net concentration of 17% was mixed with water 10%, and the impregnation amount (OPU) was 30. The absorption rate, reflow prevention and AOL values at this time are shown in Table 1 below.

Comparative Example 1

A hydrophilic agent with a surfactant net concentration of 17% was mixed with 3.5% water, and the impregnation amount (OPU) was 30. The absorption rate, reflow prevention and AOL values at this time are shown in Table 1 below.

Comparative Example 2

A hydrophilic agent with a surfactant net concentration of 17% was mixed with water 25%, and the impregnation amount (OPU) was 30. The absorption rate, reflow prevention and AOL values at this time are shown in Table 1 below.

Item unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Reflow prevention g 0.15 0.18 0.2 0.05 1.5 Absorption rate sec 3.3 3.0 2.8 5.0 1.8 AOL % 0.15 0.18 0.20 0.1 1.5

As can be seen in Table 1, when the mixing ratio of the surfactant to water is 5 to 20wt%, even if the AOL is low, as in the results of Examples 1 to 3, the reflow prevention resistance and the absorption rate are higher than those of the comparative examples. Relatively excellent. That is, when the mixing ratio is lower than the absorption rate is excellent as in Comparative Example 1, but the reflow prevention resistance is bad, when higher than the mixing ratio, the reflow prevention resistance is excellent while the absorption rate is lower.

In the spanbonded nonwoven fabric produced according to the present invention configured as described above, the surfactant, which is a hydrophilic treatment agent, is mixed at a ratio of 5 to 20 wt% with respect to water, applied to the nonwoven web, and after drying, the long fiber span of the surfactant By adding 0.3 to 1.0 wt% of AOL (Add On Level) fixed to the nonwoven fabric, it is possible to provide an absorbent having excellent performance in both reflow prevention resistance and absorption rate, and thus it can be diversified in use of the absorbent. have.

Claims (3)

Forming a filament from the molten plastic resin; Cooling the filament; Creating a stretched filament through the stretching process of the solidified filament through the cooling step; Forming a nonwoven web by thermal adhesion to agglomerate the stretched filaments and impart heat and pressure; In the method of manufacturing a non-reflow spunbond nonwoven fabric comprising the step of applying an emulsion mixed with water and a surfactant on the nonwoven web and drying to prepare a long fiber spunbond nonwoven fabric: Silastol Peach 26 containing polydimethyl siloxane as said surfactant is mixed at 5-20 wt% with respect to water, and an emulsion is formed; The impregnation amount of the emulsion on the nonwoven web is 20-40 wt%; After the drying of the emulsion impregnated in the nonwoven web, the amount of the surfactant is fixed to the nonwoven fabric is a span bond nonwoven fabric having excellent reflow resistance, characterized in that 0.3 ~ 1.0wt%. The method of claim 1, The molten plastic resin is composed of a polymer containing one component or multiple components, In the one component includes additives such as antistatic agents, colorants and antioxidants, A multi-component spunbond nonwoven fabric having excellent reflow resistance, characterized in that it is formed from a single fiber by extruding together a plurality of polymers from each extruder. The method of claim 2, When the molten plastic resin is a bicomponent fiber, polyethylene and polypropylene are employed, The dispersion form is any one selected from the group consisting of a cis-core form composed of different components inside and outside each other, a side by side form divided into two sides, and a sea island form in which one component is dispersed in another component. Spunbond nonwoven fabric manufacturing method excellent in reflow prevention properties, characterized in that the form of.