JP2012117193A - Spun-bonded nonwoven fabric having multilayer structure containing melt-blown polylactic acid and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spun-bonded nonwoven fabric having a multilayer structure containing melt-blown polylactic acid and to provide a method for producing the same.SOLUTION: In a spun-bonded nonwoven fabric having a multilayer structure including a spun-bonded nonwoven fabric as an outermost layer and at least one layer or more of melt-blown nonwoven fabric layer as an inner layer, the inner layer of the nonwoven fabric includes one or more polylactic acid melt-blown nonwoven fabric layers, if necessary, one or more spun-bonded nonwoven fabric layers or polylactic acid melt-blown nonwoven fabric layers are further laminated thereon. A method for producing the spun-bonded nonwoven fabric having the multilayer structure includes: laminating a spun-bonded nonwoven fabric layer on a screen belt continuously driven; laminating one or more melt-blown nonwoven fabric layers of the polylactic acid on the spun-bonded nonwoven fabric layer; further laminating, if necessary, one or more spun-bonded nonwoven fabric layers or melt-blown nonwoven fabric layers of the polylactic acid; then further laminating a spun-bonded nonwoven fabric layer; and using a thermal calender to simultaneously apply heat and pressure to the laminated nonwoven fabric layers, thereby causing them to thermally adhere to each other. In the spun-bonded nonwoven fabric having the multilayer structure containing the melt-blown polylactic acid, the weight of the melt-blown nonwoven fabric of the polylactic acid is 5 to 15 wt.% based on the total weight, and the total weight is 10 to 100 gsm. With such a structure, the spun-bonded nonwoven fabric having the multilayer structure containing the melt-blown polylactic acid of the present invention is not only excellent in the effect of blocking fluids but also free from delamination of the nonwoven fabric layers and is advantageous for reduction of carbon emissions because of using polylactic acid which is an environmentally friendly polymer.

Description

The present invention relates to a multilayer spunbond nonwoven fabric containing meltblown polylactic acid and a method for producing the same, and more specifically, the spunbond nonwoven fabric is the outermost layer, and the inner layer has at least one polylactic acid meltblown nonwoven fabric layer. The spunbond nonwoven fabric layer and / or the polylactic acid meltblown nonwoven fabric layer is further laminated, and the spunbond nonwoven fabric layer is laminated on a continuously driven screen belt. After laminating at least one polylactic acid meltblown nonwoven fabric layer, and optionally further laminating at least one spunbond nonwoven fabric layer and / or polylactic acid meltblown nonwoven fabric layer, a spunbond nonwoven fabric layer is further formed. Laminate and apply heat and pressure simultaneously using a thermal calendar In addition to optimizing the amount of polylactic acid melt blown nonwoven fabric and controlling the amount of hot air, maintaining the appropriate temperature of the calender roll, not only can the effect of excellent fluid barrier properties be obtained Further, the present invention relates to a multilayer spunbond nonwoven fabric containing melt blown polylactic acid which does not cause delamination of the nonwoven fabric and is advantageous for reduction of carbon emission by using polylactic acid which is an environmentally friendly polymer and a method for producing the same.

Disposable hygiene products are currently used in many fields, such as infant diapers, defecation pants and adult incontinence diapers, hygiene materials laminated with polyethylene (PE) film, sanitary napkins, etc. Widely used. Specifically, in the field of infant and child hygiene, shorts pants for diaper and infant defecation training have generally been used in place of reusable fabric 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. . A typical disposable sanitary product generally comprises a composite structure including a topsheet, a backsheet, and a sanitary structure sandwiched between the topsheet and the backsheet. It should be noted that these products usually include several types of engagement systems to fit the product closely to the wearer.

Even though current disposable infant diapers and other disposable hygiene products are generally accepted by the general public, these products still have room for improvement in certain areas. For example, interest in the treatment of solid waste is increasing worldwide. As waste landfill continues to fill up, in disposable products, other than means such as reduction of raw materials, more recyclable than disposable products, and addition of degradable components and waste landfill At present, there is a growing need for devising products that can be disposed of by this method. For this reason, the need for new materials that can be used in disposable hygiene products that generally retain their integrity and strength during use but can be disposed of more efficiently after use is greatly increased. Yes. In order to meet such needs, for example, non-woven fabric made from polylactic acid can be easily and efficiently disposed of by composting, and polylactic acid can be used from the polymerization process to the disposal process. Since the amount of generated carbon dioxide is lower than that of currently widely used polymers, there is an advantage that it is advantageous for reducing carbon emissions, and these can be used. It also has problems with other properties such as good strength.

Meanwhile, there is a growing interest and demand for environmentally friendly products worldwide. Coupled with this, a global movement to regulate the amount of carbon dioxide has already begun, and companies or countries that have exceeded the allowable emission limits with carbon emissions set are allowed. At the time when the regulation is unavoidable without buying carbon emission rights from companies or countries that do not exceed the above values, the above polylactic acid occupies an advantageous position in reducing carbon emissions. At present, in the case of polypropylene most widely used in disposable sanitary products, the amount of carbon dioxide generated is 3200 kg per 1 ton of polypropylene, whereas in the case of polylactic acid, it is 1830 kg. It can be said that it is in a very advantageous position.

In addition, when laminating by the adhesive method of spunbond nonwoven fabric and synthetic resin, if the weight of the polylactic acid meltblown nonwoven fabric is high, there is no phenomenon that the fluid barrier property increases and the synthetic resin oozes out, but the nonwoven fabric between different components When the weight of the polylactic acid meltblown nonwoven fabric is low, the synthetic resin oozes out and rolls up into a roll shape, causing the quality to deteriorate due to adhesion to the back surface. There was a problem. For this reason, in order to use the multi-layered spunbond nonwoven fabric for disposable sanitary products, it has the functionality of preventing the phenomenon of the synthetic resin seeping out, improving the fluid barrier property, and preventing the delamination phenomenon from occurring. Desired. However, at present, no technology that points out the optimum amount of meltblown polylactic acid has been mentioned.

In addition to these problems, when the amount of hot air blown when spinning polylactic acid by the melt blown method is too large, a finely fine polymer is blown off without being laminated on the screen belt. When there is too little, the fineness of the melt blown nonwoven fabric was too thick, and the problem that fluid barrier property fell occurred. For this reason, the present condition is that a technique for optimally adjusting the amount of hot air is also required. In addition, when polylactic acid is spun by the melt blown method, there is a problem in the formation of a non-woven fabric unless DCD (Die to Collector Distance) is adjusted well. If the DCD is too high, the polymer is spun like cotton and the web cannot be formed normally. If the DCD is too low, the polymers solidify, and the web is formed like a film.

Finally, the temperature of the calender roll that will go through the process of thermally sticking the laminated webs must also be maintained at an appropriate level. If the temperature is too high, a fusing phenomenon of sticking to the calender roll will occur, and if the temperature is too low, a peeling phenomenon will occur between the spunbond layer and the polylactic acid meltblown layer. A technique for appropriately maintaining the temperature of the roll is also required.

For this reason, as described above, polylactic acid has excellent functionality when used as a sanitary material, but has been developed as a practical product due to the above-mentioned problems. The one that has not been proposed so far and simply disclosed that polylactic acid can be used as part of the sanitary material is to provide a highly adaptable personal hygiene product. Application 2003-7002997 discloses a personal hygiene product comprising an absorbent and a water-soluble polymer that forms a gel upon contact with a liquid and application of minimal force, "Other polymers available for the production of fibers" As a blend of polylactic acid and bionor, adipic acid and unitox. "

However, the disclosed invention merely discloses that polylactic acid can be used as one of the mixed fibers constituting the sanitary agent, and recognizes the above-described conventional problems due to the use thereof. For this reason, no solution to this is presented.

Korean Patent Application No. 2003-7002997

The present invention has been made in view of the technical problems in the prior art described above, and its main purpose is to eliminate the problems caused by using polylactic acid having the above-mentioned excellent characteristics as a sanitary agent material. For this purpose, the melt blown nonwoven layer of the inner layer is spun using polylactic acid, but the amount of melt blown is optimized by optimizing the amount to improve the fluid barrier property and the nonwoven fabric delamination phenomenon does not occur. It is an object of the present invention to provide a multilayer spunbond nonwoven fabric containing a melt blown polylactic acid having a multilayer structure containing polylactic acid suitable for use as a sanitary product.

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

In order to achieve not only the above object but also other objects that are easily expressed, in the present invention, not only an excellent effect of fluid barrier properties can be obtained, but there is no delamination of the nonwoven fabric, and the environment The purpose is to produce a multi-layered spunbonded nonwoven fabric that is also advantageous in reducing carbon emissions by using polylactic acid, which is a gentle polymer.

The above and other objects and advantages of the present invention will become more apparent from the following description of preferred embodiments.

In order to achieve the above object, a multilayer spunbond nonwoven fabric containing the melt blown polylactic acid of the present invention is a multilayer spunbond nonwoven fabric having a spunbond nonwoven fabric as an outermost layer and having at least one melt blown nonwoven fabric layer as an inner layer. The inner layer of the nonwoven fabric has one or more polylactic acid meltblown nonwoven fabric layers, and if necessary, one or more spunbond nonwoven fabric layers or polylactic acid meltblown nonwoven fabric layers are further laminated. A spunbond nonwoven fabric layer is laminated on the screen belt, one or more polylactic acid meltblown nonwoven fabric layers are laminated on the spunbond nonwoven fabric layer, and one or more spunbond nonwoven fabric layers or polylactic acid are laminated as necessary. After further laminating a meltblown nonwoven fabric layer, further laminating a spunbond nonwoven fabric layer In addition, heat and pressure are applied simultaneously by applying heat and pressure using a heat calendar, and the weight of the polylactic acid meltblown nonwoven fabric is 5 to 15% by weight of the total weight, and the total weight is 10 to 100 gsm. Features.

According to another configuration of the present invention, the polymer of the melt blown nonwoven fabric layer is polylactic acid having a melt index (MI: Melt Index, 210 ° C.) of 70 to 85 g / 10 min.

In order to achieve the other object, a method for producing a multi-layered structure spunbond nonwoven fabric containing melt blown polylactic acid according to the present invention comprises a spunbond nonwoven fabric as an outermost layer, and a multi-layer span having at least one melt blown nonwoven fabric layer as an inner layer. A method for producing a bonded nonwoven fabric, wherein the spunbond nonwoven fabric is an outermost layer, the inner layer has one or more polylactic acid meltblown nonwoven fabric layers, and if necessary, one or more spunbond nonwoven fabric layers or polylactic acid meltblown A nonwoven fabric layer is further laminated. A spunbond nonwoven fabric layer is laminated on a continuously driven screen belt, and one or more polylactic acid meltblown nonwoven fabric layers are laminated on the spunbond nonwoven fabric layer. One or more spunbond nonwoven layers or polylactic acid meltblown nonwoven layers. And laminating a spunbond nonwoven fabric layer after the lamination, and thermally adhering the nonwoven fabric of the laminated structure by simultaneously applying heat and pressure using a thermal calender, the polylactic acid melt blown The weight of the nonwoven fabric is 5 to 15% by weight of the total weight, and the total weight is 10 to 100 gsm.

According to the other structure of this invention, the quantity of the hot air sprayed in the case of manufacture of the said meltblown nonwoven fabric is controlled by 1000-3000m < ³ > / h, It is characterized by the above-mentioned.

According to still another configuration of the present invention, when the melt blown nonwoven fabric is manufactured, a DCD (Diet to Collector Distance) is controlled to 100 to 350 mm.

According to still another configuration of the present invention, the temperature range of the calender roll to be thermally adhered is controlled to 120 to 150 ° C. when the melt blown nonwoven fabric is manufactured.

The multilayer spunbond nonwoven fabric containing the melt blown polylactic acid according to the present invention having the above-described configuration and the method for producing the same have a spunbond nonwoven fabric as an outermost layer, and the inner layer is at least one polylactic acid meltblown nonwoven fabric layer or a spunbond nonwoven fabric layer. And / or a melt-blown non-woven fabric layer that is further laminated under specific conditions, so that not only an excellent fluid barrier effect can be obtained, but also the non-woven fabric does not delaminate and is an environmentally friendly polymer. By using lactic acid, it is possible to produce a nonwoven fabric that is also advantageous for reducing carbon emissions. The nonwoven fabric of the present invention described above is suitable for infant diapers, pants-type diapers for defecation practice, and adult incontinence. It can be used effectively for diapers and sanitary napkins.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments.

Prior to describing the present invention in detail, first of all, the above-mentioned polylactic acid used throughout the specification of the present invention will be defined. Polylactic acid is generally produced by polymerization of lactic acid or lactated. Therefore, the term “polylactic acid” used in the present invention indicates a polymer produced by polymerization of lactic acid or lactated. Lactic acid may be polymerized using any known polymerization method such as polycondensation or ring-opening polymerization. In the polycondensation method, for example, L-lactic acid, D-lactic acid or mixtures thereof are directly applied to dehydration-polycondensation. In the ring-opening polymerization process, lacted, a cyclic dimer of lactic acid, is applied to the polymerization with the aid of polymerization regulators and catalysts. Lacted may include L-lacto, D-lacto and DL-lacto (Meso-lacted, also called a condensate of L-lactic acid and D-lactic acid). Each said lactated (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 and S isomer forms. D-Lacted contains two R isomers, L-Lacted contains two S isomers, and meso-lacted contains R and S isomers. Different isomers are mixed and polymerized as necessary to obtain polylactic acid having any required composition and crystallinity described below. In addition, the molecular weight of polylactic acid can be increased using a small amount of chain extender (for example, a diisocyanate compound, an epoxy compound or an acid anhydride described later). Preferably, the polylactic acid has a weight average molecular weight of 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, commercially available under the name Natureworks (registered trademark), Minneapolis, MN, USA. It is available. Other suitable polylactic acid polymers are commercially available from Biomer, Inc., Biomer, Inc. of Kleiling, Germany or from BIOMER® L9000 or from Mitsui Chemicals (LACEA®). Is available. Other suitable polylactic acids are described in US Pat. Nos. 4,797,468; 5,470,944; 5,770,682; 5,821,327; No. 5,880,254; and 6,326,458 can be used.

Also, the melt index of the polylactic acid is measured through an extrusion flow meter orifice (0.0825 inch diameter) when applied to a load of 2160 g per 10 minutes at any temperature (eg, 210 ° C.). The polymer weight (g) measured according to ASTM test method D1238-E, which is forcibly sent. Polylactic acid also typically has a melting point of about 100 ° C to about 240 ° C, in some embodiments, about 120 ° C to about 220 ° C, and in some embodiments, about 140 ° C to about 200 ° C. Such low melting point polylactic acid is useful in that they are biodegraded 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 melting point and glass transition temperature can be determined using a parallax scanning calorimeter (“DSC”) according to ASTM D-3417.

According to the present invention, the multilayer spunbond nonwoven fabric containing meltblown polylactic acid has the spunbond nonwoven fabric as the outermost layer, the inner layer has at least one polylactic acid meltblown nonwoven fabric layer, and at least one or more spunbond layers as necessary. A bond nonwoven fabric layer and / or a polylactic acid meltblown nonwoven fabric layer is further laminated.

According to a preferred embodiment of the present invention, the method for producing a multilayer spunbond nonwoven fabric of the present invention comprises laminating a spunbond nonwoven fabric layer on a continuously driven screen belt, At least one polylactic acid meltblown nonwoven fabric layer is laminated thereon, and if necessary, at least one spunbond nonwoven fabric layer and / or polylactic acid meltblown nonwoven fabric layer is further laminated, and then a spunbond nonwoven fabric layer is further laminated. And heat-adhesion by simultaneously applying heat and pressure using a thermal calendar.

As described above, in the present invention, in the process of laminating a low-weight spunbond nonwoven fabric and a polyethylene film using a synthetic resin adhesive, the synthetic resin adhesive is blocked from permeating through the nonwoven fabric and has a fluid barrier property. In order to increase, the basic nonwoven fabric is composed of multiple layers such as spunbond nonwoven fabric / meltblown nonwoven fabric / 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, limiting the number of layers to be configured. Not what you want. Hereinafter, the multilayer structure spunbonded nonwoven fabric of the present invention is referred to as “SMS-based nonwoven fabric”.

The basis weight of the SMS nonwoven fabric according to the present invention is preferably 10 to 100 gsm (g / m ² ), and more preferably 13 to 35 gsm. When the weight exceeds 100 gsm, there is an economical problem, and when the weight is less than 9 gsm, there is a disadvantage that the strength and the touch are lowered.

The weight of the polylactic acid meltblown nonwoven fabric constituting the SMS nonwoven fabric of the present invention is preferably 5 to 15% by weight of the total weight, more preferably 8 to 12% by weight. If the weight of the polylactic acid meltblown nonwoven fabric contained in the SMS nonwoven fabric is too small, such as less than 4% by weight, the texture is not fine, so that the permeation of the synthetic resin cannot be effectively blocked, and the fluid blocking property is also Is lowered. On the contrary, when the weight of the polylactic acid meltblown nonwoven fabric contained in the SMS nonwoven fabric exceeds 15% by weight, the texture is dense, and although it is effective in blocking the permeation of the synthetic resin, the interlayer peeling of the nonwoven fabric is effective. This is not preferable because it causes a phenomenon. That is, if the amount of the polylactic acid meltblown nonwoven fabric is too small, the pore diameter formed by the lamination of the fibers constituting the nonwoven fabric is increased, and the fluid synthetic resin cannot be effectively blocked, If the amount of the polylactic acid melt blown nonwoven fabric is too large, a delamination phenomenon of the nonwoven fabric is caused.

According to a preferred embodiment of the present invention, the amount of hot air added to the polylactic acid polymer for spinning the meltblown nonwoven fabric is preferably 1000 to 3000 m ³ / h, more preferably 1800. ˜2500 m ³ / h. When the amount of air added to the polylactic acid polymer is 3100 m ³ / h or more, a phenomenon occurs in which the finer polymer cannot be laminated on the screen belt and is blown away, and is 1000 m ³ / h or less. In such a case, the fineness of the polymer is too thick, which is not preferable because of the disadvantage that the effect of fluid barrier properties is reduced.

According to another preferred embodiment of the present invention, 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 DCD is 350 mm or more, the polymer is spun like cotton and the web cannot be formed normally. When the DCD is 100 mm or less, the polymers form a lump and the web looks like a film. Since the problem that it will be formed occurs, it is not preferable.

The spunbonded nonwoven fabric according to the present invention is formed by melting a molten plastic resin and extruding it through a plurality of orifices to form filaments, and the spun filaments are solidified by cooling air injected through a honeycomb-like chamber, Is blown by the pressure of the air blown from the air and the pressure of the air sucked in the lower part of the conveyor belt, and laminated on the conveyor belt with a predetermined weight to form a web. The resin used when forming the spunbonded nonwoven fabric layer in the present invention is a polyolefin-based polypropylene resin, and the polylactic acid meltblown nonwoven fabric is produced by a known method generally used in the technical field to which the present invention belongs. MI: Melt Index (210 ° C.) is 70 to 85 g / 10 min. When polylactic acid is melted and spun through a large number of orifices, strong hot air is blown from both sides of the die to make ultrafine yarn. Usually, the fiber which comprises a polylactic acid melt blown nonwoven fabric has a thickness of 1-5 micrometers. The main function of the present invention is that the nonwoven fabric has excellent fluid barrier properties and is also advantageous for reducing carbon emissions, and this function is manifested by a meltblown nonwoven fabric layer, that is, a unit of a meltblown nonwoven fabric layer. Since the weight per area acts as a large influencing factor, the weight per unit area of the meltblown nonwoven fabric needs to be 5 to 15% by weight of the total weight. Basic multi-layer spunbond nonwoven fabric (SMS-based nonwoven fabric) has a spunbond nonwoven fabric layer laminated on a continuously driven screen belt, and a meltblown nonwoven fabric layer laminated on the spunbond nonwoven fabric layer. A spunbond nonwoven fabric layer is laminated on the surface to produce an 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 fabric layer is laminated on a continuously driven screen belt, and at least one meltblown nonwoven fabric layer is laminated on the spunbond nonwoven fabric layer. After further laminating a bond nonwoven fabric layer and / or a melt blown nonwoven fabric layer, further laminating a spunbond nonwoven fabric layer, SMMS (spunbond nonwoven fabric / meltblown nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric), SSMS, SSMMS, SSMMSS, etc. Thus, it can be manufactured in various ways depending on whether or not a spunbond and a belt blown spinning beam are added.

The web accumulated in multiple layers as described above is heat sealed to provide mechanical properties and form stability. Although the bonding area is not limited, the structure of the calender roll is generally composed of an embossed roll surface with an adhesion area of 10 to 20% by weight, and the other composed of a roll with a smooth surface. The web accumulated in the sheet is formed into a sheet while passing through the roll. At this time, it is preferable that the temperature of an embossing roll and a smooth roll is 120-150 degreeC, More preferably, it is 130-140 degreeC. When the temperature of the embossing roll and the smooth roll exceeds 150 ° C, a phenomenon occurs in which the polylactic acid meltblown nonwoven fabric layer is fused to the calender roll. When the temperature is less than 120 ° C, the polylactic acid meltblown nonwoven fabric layer and the spunbond nonwoven fabric layer This is not preferable because a peeling phenomenon occurs.

The following examples and comparative examples are provided to explain the present invention more specifically, and it goes without saying that the scope of the present invention is not limited to these examples.

Various properties and physical property values of the nonwoven fabrics produced by the following examples and comparative examples were measured and evaluated by the following methods.
(1) Weight: EDANA 40.3-90
(2) Tensile stiffness: EDANA 20.2-89
(3) Bending softness: EDANA 50.5-99
(4) Water pressure resistance: DIN 53886

Example 1
In a method for producing a multi-layered spunbond using a polypropylene resin having a melt index (MI) of 35 g / 10 min and a polylactic acid having a melt index (MI) of 70 to 85 g / 10 min. Of the total weight of 15 gsm, the weight of the spunbond nonwoven fabric layer is 88% by weight / m ² , the weight of the polylactic acid meltblown nonwoven fabric layer is 12% by weight / m ² , the hot air volume of the meltblown is 2500 m ³ / h, and the DCD is 200 mm The temperature of the calender roll is 135 ° C., an SMS nonwoven fabric having a total weight of 15 gsm is manufactured, and the properties and physical properties are measured and shown in Table 1 below.

Example 2
An SMS nonwoven fabric was produced in the same manner as in Example 1 except that the total weight was changed to 18 gsm, and the properties and physical properties were measured and shown in Table 1 below.

Comparative Example 1
A nonwoven fabric was produced in the same manner as in Example 1 except that the weight of the meltblown nonwoven fabric layer was changed to 3% by weight / m ² out of a total weight of 15 gsm, and the properties and physical properties were measured and shown in Table 1 below.

Comparative Example 2
An SMS nonwoven fabric was produced in the same manner as in Example 1 except that the weight of the meltblown nonwoven fabric layer was changed to 20% by weight / m ² out of the total weight of 18 gsm. It is shown in 1.

Comparative Example 3
An SMS nonwoven fabric was produced in the same manner as in Example 1 except that the weight of the meltblown nonwoven fabric layer was 12% by weight / m ² out of the total weight of 18 gsm and the temperature of the calender roll was changed to 155 ° C. Are shown in Table 1 below.

Comparative Example 4
An SMS nonwoven fabric was produced in the same manner as in Example 1 except that the weight of the meltblown nonwoven fabric layer was 12% by weight / m ² out of the total weight of 18 gsm and the temperature of the calender roll was changed to 115 ° C. Are shown in Table 1 below.

Claims (6)

In a spunbond nonwoven fabric having a multilayer structure having a spunbond nonwoven fabric as an outermost layer and having at least one melt blown nonwoven fabric layer as an inner layer,
The inner layer of the nonwoven fabric has one or more polylactic acid meltblown nonwoven fabric layers, and if necessary, one or more spunbond nonwoven fabric layers or polylactic acid meltblown nonwoven fabric layers are further laminated. A spunbond nonwoven fabric layer is laminated on the screen belt to be laminated, one or more polylactic acid meltblown nonwoven fabric layers are laminated on the spunbond nonwoven fabric layer, and one or more spunbond nonwoven fabric layers or poly After further laminating a lactic acid meltblown nonwoven fabric layer, a spunbond nonwoven fabric layer is further laminated, and heat-adhesive by simultaneously applying heat and pressure using a thermal calender, and the weight of the polylactic acid meltblown nonwoven fabric is the total weight 5 to 15% by weight, and the total weight is 10 to 100 gsm. Multilayer structure spunbonded nonwoven fabric comprising an acid. The melt blown nonwoven fabric layer is a multilayer spunbond nonwoven fabric containing melt blown polylactic acid, wherein the polymer of the melt blown nonwoven fabric is polylactic acid having a melt index (MI: Melt Index, 210 ° C.) of 70 to 85 g / 10 min. A method for producing a multi-layered spunbond nonwoven fabric having a spunbond nonwoven fabric as an outermost layer and having at least one meltblown nonwoven fabric layer as an inner layer,
The outer layer is a spunbond nonwoven fabric, and the inner layer has one or more polylactic acid meltblown nonwoven fabric layers, and if necessary, one or more spunbond nonwoven fabric layers or polylactic acid meltblown nonwoven fabric layers are further laminated, A spunbond nonwoven fabric layer is laminated on a continuously driven screen belt, and one or more polylactic acid meltblown nonwoven fabric layers are laminated on the spunbond nonwoven fabric layer, and if necessary, one or more spunbond layers are laminated. After further laminating the nonwoven fabric layer or the polylactic acid meltblown nonwoven fabric layer, further laminating a spunbond nonwoven fabric layer;
Heat-adhering the laminated structure nonwoven fabric by simultaneously applying heat and pressure using a thermal calendar; and
Including
The weight of the polylactic acid meltblown nonwoven fabric is 5 to 15% by weight of the total weight, and the total weight is 10 to 100 gsm. A method for producing a multilayer structure spunbond nonwoven fabric containing meltblown polylactic acid. The amount of hot air blown in the production of the meltblown nonwoven fabric, a method for manufacturing a multilayer structure spunbonded nonwoven fabric comprising a melt blown polylactic acid according to claim 3, characterized in that it is controlled in 1000~3000m ³ / h. The multi-layer structure spunbonded nonwoven fabric containing meltblown polylactic acid according to claim 3, wherein a DCD (Diet to Collector Distance) is controlled to 100 to 350 mm during the production of the meltblown nonwoven fabric. Production method. 4. The method for producing a multilayer spunbond nonwoven fabric containing melt blown polylactic acid according to claim 3, wherein the temperature range of the calender roll to be thermally adhered is controlled to 120 to 150 ° C. during the production of the melt blown nonwoven fabric.