KR101221277B1 - Mutilayer spunbond nonwoven fabric including meltblown polylactic acid and preparing method thereof - Google Patents

Abstract

The present invention relates to a multi-layered spunbond nonwoven fabric comprising meltblown polylactic acid and a method of manufacturing the same. The multi-layered spunbonded nonwoven fabric including meltblown polylactic acid according to the present invention is made of an outermost layer of a spunbond nonwoven fabric as an outer layer. A multi-layered spunbond nonwoven fabric having at least one meltblown nonwoven fabric layer, wherein the inner layer of the nonwoven fabric has at least one polylactic acid meltblown nonwoven layer and, if necessary, at least one spunbond nonwoven fabric layer or polylactic acid The meltblown nonwoven layer is additionally laminated, and a spunbond nonwoven layer is laminated on a continuously driven screen belt, and at least one polylactic acid meltblown nonwoven layer is laminated on the spunbond nonwoven layer. Depending on one or more layers of spunbond nonwoven fabric or polylactic acid meltblown nonwoven fabric After laminating the layers additionally, the spunbond nonwoven fabric layer is further laminated and heat-bonded by simultaneously applying heat and pressure using a thermal calender. The weight of the polylactic acid meltblown nonwoven fabric is 5 to 15 of the total weight. Weight%, and the total weight is 10 to 100 gsm.
The multi-layered spunbonded nonwoven fabric including the meltblown polylactic acid of the present invention configured as described above can not only obtain an excellent effect on the fluid barrier property, but also by using polylactic acid, which is an environmentally friendly polymer without causing interlayer separation of the nonwoven fabric. It is possible to provide a nonwoven fabric which is advantageous for reducing carbon emissions.

Description

Multi-layered spunbond nonwoven fabric including meltblown polylactic acid and its manufacturing method {Mutilayer spunbond nonwoven fabric including meltblown polylactic acid and preparing method

The present invention relates to a multi-layered spunbond nonwoven fabric including meltblown polylactic acid and a method for manufacturing the same, and more particularly, to a spunbond nonwoven fabric as an outermost layer, and an inner layer of at least one polylactic acid meltblown ( Meltblown) non-woven fabric layer, wherein at least one or more spunbond nonwoven fabric layers and / or polylactic acid meltblown nonwoven fabric layers are additionally laminated as necessary, and the spunbonded nonwoven fabric layer is formed on a continuously driven screen belt. Laminating and laminating at least one polylactic acid meltblown nonwoven layer on the spunbond nonwoven layer and additionally laminating at least one or more spunbond nonwoven layers and / or polylactic acid meltblown nonwoven layers as needed, Laminate the spunbond non-woven fabric layer again and apply heat and pressure at the same time by using a thermal calender. In addition to optimizing the amount of polylactic acid meltblown nonwoven fabric and controlling the amount of hot air, maintaining the appropriate temperature of the calender roll, it is possible not only to obtain an excellent effect in fluid barrier properties, but also to prevent interlayer delamination of the nonwoven fabric. The present invention relates to a multi-layered spunbond nonwoven fabric including meltblown polylactic acid, which is advantageous in reducing carbon emissions by using polylactic acid, which is an environmentally friendly polymer, and a method of manufacturing the same.

Disposable hygiene products are now widely used in many fields, such as infant diapers, training pants diapers and adult incontinence diapers, hygiene materials laminated with polyethylene (PE) films, sanitary napkins and the like. In particular, in the field of infant and child hygiene, diaper and infant training pants have generally replaced reusable cloth hygiene products. Other representative disposable hygiene products include feminine hygiene products such as sanitary napkins or tampons, adult incontinence products, and health hygiene products such as surgical drapes or wound dressings. Representative disposable hygiene products generally include a composite structure including a surface sheet, a back sheet, and a sanitary structure between the surface sheet and the back sheet. In addition, these products usually include some type of fastening system for fitting the product to the wearer.

Although current disposable baby diapers and other disposable hygiene products are generally accepted by the public, these products still have room for improvement in certain areas. For example, interest in the disposal of solid waste is increasing worldwide. As landfills continue to become full, the design of products that can be disposed of by means other than by means such as reducing raw materials in disposable products, incorporating more recyclable and additionally degradable components in disposable products, and landfilling The demand for is increasing. Because of this, while maintaining their integrity and strength during use in general, the need for new materials that can be used in disposable hygiene products that can be disposed of more efficiently after use has greatly increased. In order to meet these demands, for example, non-woven fabrics made of polylactic acid can be easily and efficiently disposed of by composting, and polylactic acid is currently widely used in the amount of carbon dioxide generated from polymerization to disposal. It is lower than the polymers being used, which has an advantage in reducing carbon emissions, which may be difficult to use, but there are also problems in other properties such as mechanical strength to use it as it is.

Meanwhile, interest and demand for eco-friendly products are continuously increasing all over the world. In line with this, the global movement to regulate CO2 emissions has already begun, and the carbon emission rights must be purchased by companies or countries that have exceeded their allowances and have to buy carbon credits from companies or countries that do not exceed their allowances. In the near future, the polylactic acid is in an advantageous position in reducing carbon emissions. Polypropylene, which is currently used in disposable hygiene products, is about 3200 kg of carbon dioxide that burns 1 ton of polypropylene, whereas polylactic acid is 1830 kg, which is only about 57% by weight of polypropylene. It is in an advantageous position.

In addition, if the weight of the polylactic acid melt blown nonwoven fabric is high when the spunbond nonwoven fabric and the synthetic resin adhesive method are laminated, there is no phenomenon that the synthetic resin is not leaked due to the fluid barrier property, but due to the poor thermal adhesion of the nonwoven fabric between the nonwoven layers, When the peeling phenomenon occurs, and the weight of the polylactic acid melt blown nonwoven fabric is low, the synthetic resin bleeds out and becomes sticky to the rear surface during winding in the form of a roll, thereby degrading quality. Therefore, in order to use the multi-layered spunbonded nonwoven fabric in disposable hygiene products, it is required to prevent the bleeding of synthetic resin or to improve the fluid barrier property while preventing the delamination phenomenon. However, the techniques which point out the optimal melt blown amount of polylactic acid have not been mentioned.

In addition to the above problems, when the amount of hot air blown when the polylactic acid is blown by the melt blown method is too large, fine-saturated polymers are not laminated on the screen belt and blown, and when the amount of hot air is too small, the melt blown Since the fineness of the nonwoven fabric was too thick, a problem of poor fluid barrier property occurred. Therefore, there is also a need for a technique for optimally adjusting the amount of hot air. In addition, polylactic acid has been found to be a problem in the formation of a non-woven fabric if the control of the die to collector distance (DCD) is not well controlled when spinning the polylactic acid. If the DCD is too high, the polymer is spun like cotton, and the web is not formed properly. If the DCD is too low, the polymers aggregate together to form a web like a film.

Finally, the temperature of the calender roll which is subjected to heat adhesion of the laminated web must also be maintained at an appropriate level. If the temperature is too high, fusion may occur on the calender roll, and if the temperature is too low, there is a problem of peeling between the spunbond layer and the polylactic acid meltblown layer, thus maintaining the temperature of the calender roll properly. It is also required.

Therefore, polylactic acid as described above has excellent functionality when used as a material of the sanitary agent, but if the above problems have been developed as a practical product has not been proposed so far, only polylactic acid can be used as part of the sanitary material. In order to provide a highly compliant personal hygiene product, Korean Patent Application No. 2003-7002997 includes an absorbent and a water-soluble polymer which are gelled by contact with a liquid and application of a minimum force. Disclosing a personal care product, "another polymer available for making fibers is a blend of polylactic acid and bionol and adipic acid and unitox."

However, the invention presented above only discloses that polylactic acid can be used as one of the mixed fibers constituting the hygienic agent, and does not recognize the conventional problems presented above due to their use, and therefore a solution therefor. Is not presenting at all.

Patent Document 1: Republic of Korea Patent Application No. 2003-7002997

Accordingly, the present invention has been made in view of the above technical problems in the prior art, and a main object of the present invention is to solve the problems of using the polylactic acid having the above excellent characteristics as a material for sanitary materials. Spread the tumbled nonwoven fabric layer using polylactic acid, but optimize the amount to improve fluid barrier properties, and determine the optimal melt blown amount so that the interlayer peeling of the nonwoven fabric does not occur, so that it contains polylactic acid suitable for various personal hygiene products. To provide a multi-layered spunbond nonwoven fabric comprising a multi-layered meltblown polylactic acid.

Another object of the present invention is to provide a method for more easily producing a multi-layered spunbond nonwoven fabric of the above object.

In order to achieve not only the above object but also other objects that are easily expressed, the present invention not only obtains an excellent effect on the fluid barrier property, but also reduces carbon emissions by using polylactic acid, which is an environmentally friendly polymer without the interlayer peeling of the nonwoven fabric. It is also an object to produce advantageous multi-layered spunbond nonwovens.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

Multi-layered spunbond nonwoven fabric comprising meltblown polylactic acid of the present invention for achieving the above object;

A spunbond nonwoven fabric having a multi-layer structure having a spunbond nonwoven fabric as an outermost layer and having at least one meltblown nonwoven fabric layer in an inner layer,

The inner layer of the nonwoven fabric has one or more layers of polylactic acid meltblown nonwoven fabrics, and if necessary, one or more layers of spunbond nonwoven fabrics or polylactic acid meltblown nonwoven layers are additionally laminated, and the screen is continuously driven. Laminating a spunbond nonwoven layer on the belt, and laminating one or more layers of polylactic acid meltblown nonwoven layer on the spunbond nonwoven layer, and optionally adding one or more layers of spunbond nonwoven layer or polylactic acid meltblown nonwoven layer. After lamination, the spunbond nonwoven fabric layer was laminated again, and heat-bonded by simultaneously applying heat and pressure using a thermal calender. The weight of the polylactic acid meltblown nonwoven fabric was 5 to 15% by weight of the total weight. The total weight is characterized by 10 to 100 gsm.

According to another configuration of the present invention, the meltblown nonwoven layer polymer is characterized in that the melt flow index (MI: Melt Index, 210 ℃) is polylactic acid having a 70 to 85g / 10 minutes.

Method for producing a multi-layered spunbond nonwoven fabric comprising a meltblown polylactic acid of the present invention for achieving the above another object;

In manufacturing a spunbond nonwoven fabric having a multi-layer structure having the spunbond nonwoven fabric as the outermost layer and having at least one meltblown nonwoven fabric layer in the inner layer,

The nonwoven fabric is made of a spunbond nonwoven fabric as the outermost layer, and the inner layer has at least one polylactic acid meltblown nonwoven fabric layer, and if necessary, at least one spunbonded nonwoven fabric layer or polylactic acid meltblown nonwoven fabric layer is additionally laminated. A spunbond nonwoven layer is laminated on a continuously driven screen belt, and at least one polylactic acid meltblown nonwoven layer is laminated on the spunbond nonwoven layer, and at least one spunbond nonwoven layer or polylactic acid, if necessary. Additionally laminating the meltblown nonwoven layer, and then laminating the spunbond nonwoven layer again;

Heat-bonding the nonwoven fabric having the laminated structure by simultaneously applying heat and pressure using a thermal calender;

The weight of the polylactic acid meltblown nonwoven fabric is 5 to 15% by weight of the total weight, characterized in that the total weight is prepared by 10 to 100gsm.

According to another configuration of the present invention, the amount of hot air blown during the production of the meltblown nonwoven fabric is characterized in that it is manufactured by controlling to 1000 to 3000 ㎥ / h.

According to another configuration of the present invention, when manufacturing the meltblown nonwoven fabric DCD (Die to Collector Distance) is characterized in that the manufacturing to 100 to 350mm.

According to another configuration of the invention, the temperature range of the heat-calendar calender roll during the manufacture of the meltblown nonwoven fabric is characterized in that it is manufactured to 120 to 150 ℃.

The multi-layered spunbond nonwoven fabric including the meltblown polylactic acid of the present invention configured as described above and a method of manufacturing the spunbond nonwoven fabric as the outermost layer, and the inner layer is at least one polylactic acid meltblown nonwoven fabric layer or spunbond. Since the nonwoven fabric layer and / or the meltblown nonwoven fabric layer are additionally laminated under specific conditions, it is possible not only to obtain an excellent effect on fluid barrier properties but also to use polylactic acid, which is an environmentally friendly polymer without causing interlayer separation of the nonwoven fabric. The nonwoven fabric of the present invention can also be produced by advantageously reducing carbon emissions, and the nonwoven fabric of the present invention can be usefully used for infant diapers, diaper pants for diapers, adult incontinence diapers, sanitary napkins, and the like.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail by preferable embodiment.

Prior to describing the present invention in detail, the polylactic acid is generally defined by the polymerization of lactic acid or lactide, and is thus used in the present invention, as defined above for the polylactic acid used throughout the present specification. The term "polylactic acid" is intended to denote a polymer prepared by the polymerization of lactic acid or lactide. The lactic acid may be polymerized using any known polymerization method such as polycondensation or ring-opening polymerization. In the polycondensation process, for example L-lactic acid, D-lactic acid or mixtures thereof are applied directly to dehydration-polycondensation. In the ring-opening polymerization process, lactide, a cyclic dimer of lactic acid, is subjected to polymerization with the aid of polymerization regulators and catalysts. Lactides may include L-lactide, D-lactide and DL-lactide (also called meso-lactide, condensates of L-lactic acid and D-lactic acid). Each such lactide (ie, L-lactide, D-lactide and DL-lactide) is a dimer. That is, they consist of two lactic acid units. Because of its chiral center, lactic acid has two different stereochemical isomers, namely the R isomer and the S isomer shape. D-lactide comprises two R isomers, L-lactide comprises two S isomers, and meso-lactide includes the R and S isomers. Different isomers can be mixed and polymerized if necessary to obtain polylactic acid having any desired composition and crystallinity as described in more detail below. In addition, small amounts of chain extenders (eg diisocyanate compounds, epoxy compounds or acid anhydrides described below) may be used to increase the molecular weight of polylactic acid. Suitably, the weight average molecular weight of the polylactic acid is from about 60,000 to about 1,000,000.

Suitable polylactic acid polymers that can be used in the present invention include, but are not limited to, one specific example commercially under the name Natureworks (Natureworks®) of Minneapolis, Minn. Available. Other suitable polylactic acid polymers are commercially available from BIOMER ™ L9000 or Mitsui Chemical (LACEA ™) from Biomer, Inc., Cryling, Germany. It is possible. Still other suitable polylactic acids are described in US Pat. Nos. 4,797,468; No. 5,470,944; 5,770,682; No. 5,821,327; 5,880,254; 5,880,254; And 6,326,458 can be used.

In addition, the melt flow index of the polylactic acid can be forced through an extrusion flow meter orifice (0.0825 inches in diameter) when applied to a load of 2160 g in 10 minutes at any temperature (eg 210 ° C.), ASTM test method D1238-. The weight (g) of the polymer measured according to E is shown. Polylactic acid also typically has a melting point of about 100 ° C. to about 240 ° C., in some embodiments from about 120 ° C. to about 220 ° C., and in some embodiments from about 140 ° C. to about 200 ° C. These low melting polylactic acids are useful in that they biodegrade at high speed. The glass transition temperature (“Tg”) of polylactic acid is also relatively low to improve the solubility and processability of the polymer. For example, the Tg may be about 80 ° C. or less, in some embodiments about 70 ° C. or less, and in some embodiments about 65 ° C. or less. As discussed in more detail below, both the melting point and glass transition temperature can be determined using a differential scanning calorimeter (“DSC”) in accordance with ASTM D-3417.

The multi-layered spunbond nonwoven fabric comprising meltblown polylactic acid according to the present invention has a spunbond nonwoven fabric as the outermost layer, and the inner layer has at least one layer of polylactic acid meltblown nonwoven fabric and at least one or more spunbonds as necessary. The nonwoven layer and / or the polylactic acid meltblown nonwoven layer are additionally laminated.

In addition, according to a preferred embodiment of the present invention, the method for producing a multi-layered spunbond nonwoven fabric of the present invention comprises laminating a spunbond nonwoven layer on a continuously driven screen belt and at least one polylactic acid melt on the spunbond nonwoven layer. Laminate the tumbled nonwoven layer and at least one or more spunbond nonwoven layers and / or polylactic acid meltblown nonwoven layers, if necessary, further laminate the spunbond nonwoven layer and heat and heat using a calender. It is characterized by thermal adhesion by applying pressure simultaneously.

As described above, in the present invention, the spunbond nonwoven fabric is composed of a basic nonwoven fabric to block the permeation of the nonwoven fabric and to improve the fluid barrier property in the process of laminating a low weight spunbond nonwoven fabric and a polyethylene film using a synthetic resin adhesive. / Meltblown nonwoven / Spunbond nonwoven fabric. Here, the spunbond nonwoven fabric layer forming the outer layer can be composed of one or more layers, and the inner polylactic acid meltblown nonwoven fabric layer can also be composed of one or more layers, and the number of layers to be formed is not limited. Hereinafter, the multi-layered spunbond nonwoven fabric of the present invention is referred to as "SMS-based nonwoven fabric".

The weight of the SMS-based nonwoven fabric according to the present invention is preferably 10 to 100 gsm (g / m 2), more preferably 13 to 35 gsm is effective, there is an economic problem when the weight exceeds 100 gsm, 9 gsm If less than this, there is a disadvantage of strength and touch deterioration is not preferable.

The weight of the polylactic acid meltblown nonwoven fabric constituting the SMS-based nonwoven fabric of the present invention is preferably 5 to 15% by weight, more preferably 8 to 12% by weight. When the amount of the polylactic acid meltblown nonwoven fabric included in the SMS-based nonwoven fabric is too small, less than 4 wt%, the tissue is not dense and effectively blocks the penetration of synthetic resin, and the fluid barrier property is also lowered. If the structure becomes dense, it is effective to block the penetration of the synthetic resin, but it is not preferable because it causes the delamination between the nonwoven fabrics. That is, if the amount of the polylactic acid meltblown nonwoven fabric is too small, the pore size formed by the fibers constituting the nonwoven fabric and the inter-fiber lamination becomes large, so that the synthetic resin in the fluid form cannot be effectively blocked, and the polylactic acid melt An excessively large amount of tumbled nonwoven will cause nonwoven interlayer delamination.

In addition, according to a preferred embodiment of the present invention, the amount of hot air applied to the polylactic acid polymer for spinning the meltblown nonwoven fabric is preferably 1000 to 3000 m 3 / h, more preferably 1800 to 2500 m 3 / h desirable. If the amount of air applied to the polylactic acid polymer is 3100 m 3 / h or more, the finely-saturated polymer may not be laminated on the screen belt, and a blowing phenomenon may occur. It is not preferable because it has a disadvantage of inferior effect.

According to another preferred embodiment of the present invention, the distance of the DCD, which is the distance until the polylactic acid polymer is laminated on the screen belt, is preferably 100 to 350 mm, more preferably 150 to 250 mm. When the distance of the DCD is 350mm or more, the polymer is spun like cotton and the web is not formed properly. When the DCD is less than 100mm, the polymers are agglomerated and a problem occurs in that the web is formed like a film.

The spunbond nonwoven fabric according to the present invention melts and melts the molten plastic resin and extrudes into a plurality of orifices to form filaments, and the spunbonded filaments are solidified by cooling air injected through a honeycomb chamber and blown from the top with a conveyor The web is drawn by stretching by the pressure of the air sucked from the bottom of the belt and laminating it with a constant weight on the conveyor belt. The resin used to make the spunbond nonwoven fabric layer in the present invention is a polyolefin-based polypropylene resin, and the method for producing a polylactic acid meltblown nonwoven fabric is a melt flow index (Kn) using a known method commonly used in the art. MI: Melt Index, 210 ° C.) melts polylactic acid with 70 to 85 g / 10 min and blows it with strong hot air on both sides of the detention when spun into a plurality of orifices to make microfiber. Typically, the fibers constituting the polylactic acid meltblown nonwoven fabric have a thickness of 1 to 5 mu m. The main function of the present invention is that the nonwoven fabric has an excellent fluid barrier property and is also advantageous in reducing carbon emissions, and expressing this function acts as a large influence factor due to the weight per unit area of the meltblown nonwoven fabric layer, that is, the meltblown nonwoven fabric layer. The weight per unit area of the meltblown nonwoven should be 5-15% by weight of the total weight. The basic multi-layered spunbond nonwoven fabric (SMS-based nonwoven fabric) has a spunbond nonwoven fabric layer laminated on a continuously driven screen belt, a meltblown nonwoven fabric layer stacked on the spunbond nonwoven fabric layer, and finally a spunbonded nonwoven fabric layer laminated. So it is made of SMS nonwoven fabric. Here, the spunbond nonwoven fabric layer and the meltblown nonwoven fabric layer may be one or more layers, and the number of layers is not limited. That is, a spunbond nonwoven layer is laminated on a continuously driven screen belt, and at least one meltblown nonwoven layer is laminated on the spunbond nonwoven layer, and at least one or more spunbond nonwoven layers and / or meltbles, as necessary. The additional nonwoven layer is additionally laminated, and then the spunbond nonwoven layer is laminated again, such as spunbond nonwoven fabrics, spunbond nonwoven fabrics, meltblown nonwoven fabrics, meltblown nonwoven fabrics, spunbonded nonwoven fabrics, SSMS, SSMMS, and SSMMSS. According to the addition of the melt blown radiation beam can be produced in various ways.

The multilayered web as described above is thermally bonded to impart mechanical properties and morphological stability. Although it does not limit the adhesion area, the calender roll is composed of an emboss roll having one side usually having a bonding area of 10 to 20% by weight, and the other side is composed of a roll having a smooth surface. The integrated web is sheeted through the rolls. At this time, 120-150 degreeC is preferable and, as for the temperature of an emboss roll and a smooth roll, More preferably, 130-140 degreeC is more effective. When the temperature of the emboss roll and the smooth roll exceeds 150 ° C, the polylactic acid meltblown nonwoven layer is fused to the calender roll, and below 120 ° C, between the polylactic acid meltblown nonwoven layer and the spunbond nonwoven layer Peeling phenomenon is not preferable.

The following examples and comparative examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

Various properties and physical properties of the nonwoven fabrics prepared according to the following Examples and Comparative Examples were measured and evaluated by the following method.

(1) Weight: EDANA 40.3-90

(2) Tensile strength and Elongation: EDANA 20.2 -89

(3) Bending Length: EDANA 50.5-99

(4) Hydrostatic Head: DIN53886

Example 1

In the method for producing a multi-layered spunbond using a polypropylene resin having a melt flow index (MI: Melt Index) of 35 g / 10 minutes and a polylactic acid having a melt flow index (MI: Melt Index) of 70 to 85 g / 10 minutes The weight of the spunbond nonwoven fabric layer is 88 wt% / m 2, the weight of the polylactic acid melt blown nonwoven fabric layer is 12 wt% / m 2, and the hot air volume of the melt blown is 2500 m 3 / h, and the DCD is 200 mm. , The calender roll temperature was 135 ℃ to prepare a non-woven fabric of the SMS form of the total weight of 15gsm, and measured and shown in Table 1 below.

Example 2

SMS-based nonwoven fabrics were prepared in the same manner as in Example 1, except that the total weight was 18 gsm, and the properties and physical properties thereof were shown in Table 1 below.

Comparative Example 1

A nonwoven fabric was prepared in the same manner as in Example 1, except that the weight of the meltblown nonwoven fabric was 3 wt% / m 2 in a total weight of 15 gsm, and the properties and physical properties thereof were shown in Table 1 below.

Comparative Example 2

SMS-based nonwoven fabrics were prepared in the same manner as in Example 1, except that the weight of the meltblown nonwoven fabric layer was 18 wt% / m 2, and the properties and physical properties thereof were shown in Table 1 below.

Comparative Example 3

An SMS-based nonwoven fabric was manufactured in the same manner as in Example 1, except that the weight of the meltblown nonwoven fabric layer was 12 wt% / m 2 and the calender roll temperature was 155 ° C. in 18 gsm of the total weight. It is shown in Table 1 below.

Comparative Example 4

SMS-based nonwoven fabric was prepared in the same manner as in Example 1 except that the weight of the meltblown nonwoven fabric layer was 12 wt% / m 2 and the calender roll temperature was 115 ° C. in 18 gsm of the total weight. It is shown in Table 1 below.

Item Gross weight
(gsm) Meltblown Nonwovens Gross Weight (%) DCD Calendar roll
Temperature (℃) burglar
(MD) burglar
(CD) Water pressure
(mmH ₂ O) Peeling phenomenon Example 1 15 12 200 135 3.2 1.7 154 radish Example 2 18 12 200 135 4.2 2.2 172 radish Comparative Example 1 15 3 200 135 3.0 1.4 79 radish Comparative Example 2 18 20 200 135 3.1 1.6 119 U Comparative Example 3 18 12 200 155 - - - - Comparative Example 4 18 12 200 115 2.9 1.6 112 U

Claims (6)

delete delete In manufacturing a spunbond nonwoven fabric having a multi-layer structure having the spunbond nonwoven fabric as the outermost layer and having at least one meltblown nonwoven fabric layer in the inner layer,
The nonwoven fabric is made of a spunbond nonwoven fabric as the outermost layer, and the inner layer has at least one polylactic acid meltblown nonwoven fabric layer, and if necessary, at least one spunbonded nonwoven fabric layer or polylactic acid meltblown nonwoven fabric layer is additionally laminated. A spunbond nonwoven layer is laminated on a continuously driven screen belt, and at least one polylactic acid meltblown nonwoven layer is laminated on the spunbond nonwoven layer, and at least one spunbond nonwoven layer or polylactic acid, if necessary. Additionally laminating the meltblown nonwoven layer, and then laminating the spunbond nonwoven layer again;
Heat-bonding the nonwoven fabric having the laminated structure by simultaneously applying heat and pressure using a thermal calender;
Here, the amount of hot air blown during the manufacture of the meltblown nonwoven fabric is controlled to 1000 to 3000 ㎥ / h, the weight of the polylactic acid meltblown nonwoven fabric is 5 to 15% by weight of the total weight, the total weight is 10 Method for producing a multi-layered spunbond nonwoven fabric comprising melt blown polylactic acid, characterized in that to prepare to 100gsm
delete The method of claim 3, wherein the manufacturing method of the meltblown nonwoven fabric includes a melt blown polylactic acid, characterized in that a die to collector distance (DCD) is 100 to 350 mm. .
The method of claim 3, wherein the temperature range of the heat-adhesive calender roll during the production of the meltblown nonwoven fabric is 120 to 150 ° C. .