KR101520228B1

KR101520228B1 - Biodegradation Non-Woven Fabric and Manufacturing Apparatus and Manufacturing Method

Info

Publication number: KR101520228B1
Application number: KR1020140088244A
Authority: KR
Inventors: 구기승
Original assignee: 구기승
Priority date: 2014-07-14
Filing date: 2014-07-14
Publication date: 2015-05-13
Also published as: WO2016010303A1

Abstract

In an embodiment of the present invention, PLA (biodegradable polylactic acid) is melted by putting it in an extruder of a first and a second fiber producing machine, and is then radiated through a spinning nozzle having hundreds of small orifices formed therein, A step S10 of producing a first PLA fiber and a second PLA fiber, respectively, by stretching and cooling by high-pressure hot air blown into the first PLA fiber; The first PLA fibers produced in the first fiber producing machine are injected onto a first mesh drum and integrated in a web form, and the second PLA fibers produced in the second fiber producing machine are injected onto a second mesh drum A step S20 of integrating the data in the form of a web; S30 is a step of supplying pulp between the first PLA fibers and the second PLA fibers integrated in the web form to intervene therebetween; And a step (S40) of bonding the first PLA fiber, the pulp and the second PLA fiber to each other by thermally fusing the first PLA fiber, the pulp and the second PLA fiber, and an apparatus and a method for manufacturing the biodegradable nonwoven fabric.
The embodiment of the present invention utilizes the soft characteristics, the absorbency and the bulkiness of the pulp through the pulp having the soft property, the absorbency and the bulkiness between the first and second PLA fibers having excellent physical properties and the first PLA fiber and the second PLA fiber The pulp is held and protected so that it has the mechanical strength necessary for actual use, and thus the nonwoven fabric having excellent quality can be efficiently produced, and the manufacturing cost can be reduced through a simple process.

Description

TECHNICAL FIELD [0001] The present invention relates to a biodegradable non-woven fabric,

An embodiment of the present invention relates to an environmentally friendly biodegradable nonwoven fabric, an apparatus for manufacturing the same and a manufacturing method thereof, and more particularly to an environmentally friendly biodegradable nonwoven fabric which improves water absorbency, softness, will be.

In general, nonwoven fabric refers to nonwoven fibers. That is, it refers to a fiber aggregate not based on spinning, weaving, or braiding, which is formed by sheeting and combined by physical and chemical means.

Conventionally, nonwoven fabrics are made by pulverizing highly absorbent pulp with polyethylene (PE) or polypropylene (PP) having high bonding strength when used as sanitary articles.

However, since polyethylene (PE) and polypropylene (PP) are sprayed with harmful components and are not absorbed, there is a problem that can cause skin diseases such as itchy erythema of soft skin and problems that cause environmental problems after disposal .

Recently, efforts to reduce carbon dioxide in accordance with global warming have been continuously studied. In particular, polymer produced from fossil fuels not only increases carbon dioxide emissions but also has limited reserves. Therefore, studies are underway on polylactic acid products that can be formed into fibers by melt-spraying polymers synthesized from natural plants.

Poly lactic acid (PLA) has formed a market of 150,000 tons worldwide, and it has been used for disposable products using biodegradable properties of PLA, as well as fields where general plastics such as food packaging materials, containers and electronic cases were used And its application range is expanding.

However, the poly lactic acid (PLA) has a higher price than polyethylene (PE) or polypropylene (PP), has a rough texture, a small volume, and low elasticity.

Korea Published Patent: 10 - 2012 - 0107092 (Publication date September 28, 2012)

Korean Registered Patent: 10 - 1075004 (Published on October 19, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems,

It is an object of the present invention to improve the physical properties by absorbing water, softness and bulkiness through a pulp layer having soft properties, absorbency and bulkiness between the first PLA layer and the second PLA layer having excellent physical properties, Friendly biodegradable nonwoven fabric in which biodegradation is carried out, an apparatus for manufacturing the nonwoven fabric, and a manufacturing method.

Another object of the present invention is to provide an environmentally friendly biodegradable nonwoven fabric capable of improving the quality of the nonwoven fabric and reducing the manufacturing cost, and an apparatus and a manufacturing method thereof.

In order to achieve the above object, an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention includes: a first PLA fiber fabricator for fiberizing a PLA; A first mesh drum for collecting the first PLA fibers injected from the first PLA fiber producing machine in a web form; A pulp supplying unit provided at one side of the first mesh drum and stacking pulp on one surface of the first PLA fiber integrated on the first mesh drum; A second PLA fiber fabricator provided at one side of the pulp supplying section to fiberize PLA; A second mesh drum for accumulating the second PLA fibers injected from the second PLA fiber producing machine in a web form and stacking the same on one surface of the pulp; A heat fusing unit for applying heat to the laminated material stacked in the order of the first PLA fiber, the pulp, and the second PLA fiber to mutually thermally fuse the laminated materials; And controlling the injection amount of the first and second PLA fibers, which are electrically connected to the first and second PLA fiber producing machines and the pulp supplying parts, and which are manufactured in the first and second PLA fiber producing machines, And a control unit for controlling the control unit.

The first and second PLA fiber producing machines include an extruder for melting and extruding PLA (biodegradable polylactic acid), an injection nozzle having hundreds of small orifices for injecting the PLA melted in the extruder, A cooler for cooling the elongated PLA; a cutter for cutting the PLA fiber determined by the elongation; and a blower for blowing the cut PLA fibers And an ejection port for ejecting the ink.

And a filter device for filtering the molten PLA is further provided between the extruder and the injection nozzle.

The extruder is divided into first to fifth regions, wherein the first region is 150 to 160 캜, the second region is 200 to 210 캜, the third region is 220 to 230 캜, the fourth region is 230 to 240 캜, 5 region is set to a temperature of 250 to 260 캜.

The pulp feeder is connected to a pulsator which separates pulp fibers made of sheets or mats into individual fibers.

The control unit controls the injection amount of the first PLA fiber manufacturing machine so that 10 wt% to 40 wt% of the first PLA fibers are injected relative to the total weight of the nonwoven fabric, and 25 wt% to 80 wt% of pulp is supplied And the injection amount of the second PLA fiber manufacturing machine is controlled so that the second PLA fibers are injected in an amount of 10% by weight to 40% by weight based on the total weight of the nonwoven fabric.

According to an embodiment of the present invention, a method of manufacturing an environmentally friendly biodegradable nonwoven fabric includes PLA (biodegradable polylactic acid) in an extruder of a first and a second fiber manufacturing machine, melting the same, and then, through a spinning nozzle in which hundreds of small orifices are formed (S10) of preparing first PLA fibers and second PLA fibers by stretching and cooling them with high-pressure hot air blown at high speed from both sides of the spinning nozzle; The first PLA fibers produced in the first fiber producing machine are injected onto a first mesh drum and integrated in a web form, and the second PLA fibers produced in the second fiber producing machine are injected onto a second mesh drum A step S20 of integrating the data in the form of a web; S30 is a step of supplying pulp between the first PLA fibers and the second PLA fibers integrated in the web form to intervene therebetween; (S40) of bonding the first PLA fiber, the pulp, and the second PLA fiber by heat fusion.

The extruder has a first region in which the temperature is set at 150 to 160 캜, a second region in which the temperature is set in the range of 200 to 210 캜, a third region in which the temperature in the range of 220 to 230 캜 is set, Lt; 0 > C, and the PLA is completely melted through the first to fifth regions.

The step S10 further includes a step of filtering the melted PLA.

The PLA is also characterized in that it is selected from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid.

The PLA has a melting point of 100 ° C. to 180 ° C., a melt index of 75 to 120 g / 10 min, and a melt density of 0.98 to 2.24 g / cm 3 (260 ° C.).

The pulp is characterized in that the pulp fiber made of a sheet or a mat is put in a cotton drum and separated into individual fibers.

The first PLA fibers are sprayed in an amount of 10 wt% to 40 wt% of the total weight of the nonwoven fabric, and the pulp is accumulated in an amount of 25 wt% to 80 wt% of the total weight of the nonwoven fabric, 10% by weight to 40% by weight.

The green biodegradable nonwoven fabric according to one embodiment of the present invention comprises a first PLA fiber layer integrated in a web form on a first mesh drum by the above manufacturing method; A pulp layer laminated on the first PLA fibrous layer; And a second PLA fiber layer integrated on the second mesh drum in the form of a web and stacked on the upper surface of the pulp layer are thermally fused to each other.

The embodiment of the present invention utilizes the soft characteristics, the absorbency and the bulkiness of the pulp through the pulp having the soft property, the absorbency and the bulkiness between the first and second PLA fibers having excellent physical properties and the first PLA fiber and the second PLA fiber The pulp is held and protected so that it has the mechanical strength necessary for actual use, and thus the nonwoven fabric having excellent quality can be efficiently produced, and the manufacturing cost can be reduced through a simple process.

In addition, it is possible to reduce manufacturing cost by using pulp, and it does not cause environmental problems as 100% biodegradation after disposal, does not release substances harmful to carcinogens or hygiene, and has excellent breathability and refreshing sensation And a nonwoven fabric having improved safety can be produced.

In addition, the first and second PLA fibers can be washed by holding the surface of the pulp, thereby making it possible to produce a nonwoven fabric which can be repeatedly used many times.

1 is a schematic view for explaining an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.
2 is a block diagram for explaining the overall configuration of an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.
3 is a block diagram for explaining the construction of a first and a second PLA fiber manufacturing apparatus in an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.
5 is a sectional view showing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. Hereinafter, an environmentally friendly biodegradable nonwoven fabric, an apparatus for producing the same, and a method for manufacturing the same will be described in detail with reference to the accompanying drawings. For purposes of this specification, like reference numerals in the drawings denote like elements unless otherwise indicated.

FIG. 1 is a schematic view for explaining an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention, FIG. 2 is a block diagram for explaining the overall configuration of an environmentally- FIG. 3 is a block diagram for explaining the construction of first and second PLA fiber production apparatuses in an environmentally friendly biodegradable nonwoven fabric manufacturing apparatus according to an embodiment of the present invention.

1 and 2, an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric includes a first PLA fiber manufacturing machine 100, a first mesh drum 200, a second PLA fiber manufacturing machine 300, a second mesh drum 400, A pulp feeding unit 500, a control unit 600, and a heat fusion unit 700.

First, the first and second PLA fiber producing apparatuses 100 and 300 include extruders 110 and 310 for melting and extruding PLA (biodegradable polylactic acid) to be injected as shown in FIG. 3, A filter device 120 and 320 provided between the extruder and the spray nozzle for filtering the molten PLA and a PLA provided on both sides of the spray nozzle for spraying with the spray nozzle, (150, 350) for cooling the stretched PLA, cutters (160, 360) for cutting the PLA fibers determined by stretching, and ejection openings (170, 370) for ejecting the cut PLA fibers do. The injection port is provided with valves 171 and 371 that are electrically connected to the control unit and adjust the injection amount of the PLA fibers to be injected.

Here, the extruders 110 and 310 are divided into first to fifth regions. The third region is 220-230 占 폚, the fourth region is 230-240 占 폚, and the fifth region is 250-260 占 폚. The temperature of the first region is 150-160 占 폚, the second region is 200-210 占 폚, Respectively.

The injection nozzles 130 and 330 have a diameter of 0.88 mm per 12 to 16 cm, and hot air having a high velocity distribution forms a variety of filaments between 0.1 and 500 microns in diameter.

The first mesh drum 200 is disposed below the first PLA fiber manufacturing machine 100 and the second mesh drum 400 is disposed below the second PLA fiber manufacturing machine 300.

The first mesh drum 200 accumulates the first PLA fibers 10 injected from the first PLA fiber manufacturing machine 100 in a web form and the second mesh drum 400 accumulates the second PLA fiber assemblies 300 The second PLA fibers 30 are integrated in a web form.

A pulp feeder 500 is disposed between the first mesh drum 200 and the second mesh drum 400.

The pulp feeder 500 feeds the pulp between the first mesh drum 200 and the second mesh drum 400 to feed the first PLA fiber 10 and the second PLA fiber 10 integrated on the first mesh drum 200, The pulp 20 is interposed between the second PLA fibers 30 integrated in the form of a web on the mesh drum 400.

Here, the pulp feeder 500 may directly feed the pulp, but the pulp feeder 500 is connected to the pulverizer 510, which separates the pulp fibers made of sheet or mat into individual fibers, Separated pulp of individual fibers may also be fed.

The first PLA fiber producing machine 100, the second PLA fiber producing machine 300 and the pulp supplying part 500 are electrically connected to the controller 600, respectively.

The control unit 600 controls the first PLA fiber manufacturing machine 100, the second PLA fiber manufacturing machine 300 and the valves 171, 371 and 520 of the pulp feeding part 500 to adjust the injection amounts of the first and second PLA fibers and pulp . In addition, after the first and second PLA fibers are first injected and integrated in a web form on the first and second mesh drums 200 and 400, pulp is sprayed to form an intervening layer between the first and second PLA fibers, So as to control the jetting time difference between the first and second PLA and the pulp.

In addition, a heat fusion portion 700 is provided on one side of the second mesh drum 400.

The heat-sealable portion 700 is composed of a cylinder through which the laminated material stacked in the order of the first PLA fiber, the pulp, and the second PLA fiber guided by the second mesh drum 400 passes. The calender is a press roller that lubricates paper or fabric, and thermally fuses the first PLA fiber, the pulp, and the second PLA fiber of the laminate, which is passed under heat. At this time, the handle is carved so as to increase the binding force of the first PLA fiber, the pulp, and the second PLA fiber.

4 is a flowchart illustrating a method of manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.

A method of manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention includes the steps of putting a PLA (biodegradable polylactic acid) into an extruder of a first and a second fiber manufacturing machine, melting the same, and then spinning a nozzle having hundreds of small orifices (S10) of preparing first PLA fibers and second PLA fibers, respectively, by drawing and cooling them with high-pressure hot air blown at high speed from both sides of the spinning nozzle; The first PLA fibers produced in the first fiber producing machine are injected onto the first mesh drum and integrated in the form of a web and the second PLA fibers produced in the second fiber producing machine are injected onto the second mesh drum Integrating them in the form of a Web; S30: supplying pulp between the first PLA fiber and the second PLA fiber integrated in a web form to interpose the pulp; And the step (S40) of bonding the first PLA fiber, the pulp and the second PLA fiber by heat fusion.

Step S10 is performed in the first PLA fiber producing machine 100 and the second PLA fiber producing machine 300. [

PLA (biodegradable polylactic acid) is put into each of the extruders 110 and 310 of the first PLA fiber producing machine 100 and the second PLA fiber producing machine 300 to melt them.

Here, the PLA has a melting point of 100 to 180 캜, a melt index of 20 to 40 g / 10 min, and a melt density of 0.98 to 2.24 g / cm 3 (260 캜). In addition, PLA is selected from poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid.

The extruders 110 and 310 have a first region in which a temperature is set at 150 to 160 ° C, a second region in which a temperature in a range of 200 to 210 ° C is set, a third region in which a temperature in a range of 220 to 230 ° C is set, , And a fifth region where the temperature is set at 250 to 260 캜.

Thus, the PLA is completely dissolved while passing through the first to fifth regions of the extruders 110 and 310.

The completely dissolved PLA is then filtered by the filter devices 120 and 320 and supplied to the injection nozzle 130. The PLA supplied to the injection nozzles 130 and 330 is injected through hundreds of small orifices.

Then, the injected PLA is drawn by the high-pressure hot air blowing at high speed from the hot air (140, 340) and cooled by the coolers (150, 350) to be fibrous.

The fibrous PLA is then cut into cutters 160 and 360 and is ejected through the injection ports 170 and 170. At this time, the first PLA fibers 10 and the second PLA fibers 30 injected into the injection ports 170 and 370 are injected in an amount of 10% by weight to 40% by weight, respectively, based on the total weight of the nonwoven fabric.

In step S20, the first PLA fiber 10 manufactured in the first fiber manufacturing machine 100 is sprayed on the first mesh drum 200, the first mesh drum 200 is sprayed on the first PLA fiber 10 to be sprayed, In the form of a Web. The second PLA fabric 30 produced by the second fiber manufacturing machine 300 is sprayed onto the second mesh drum 400 and the second mesh drum 400 is sprayed with the second PLA fiber 30 It is integrated in the form of Web.

At this time, the web formed by the melt-blown method has an isotropic structure. That is, since the web is formed for the hot air, the fibers are arbitrarily arranged in the machine direction and the machine width direction, and are not sufficiently cooled, so that mutual bonding is achieved by thermal bonding between the fibers.

In step S30, the pulp 20 injected from the pulp feeder 500 is interposed between the first PLA fiber 10 and the second PLA fiber 30 that are integrated and transported in a web form. At this time, the pulp 20 is interposed between 25 wt% and 80 wt% with respect to the total weight of the nonwoven fabric.

In step S40, the laminated material stacked in the order of the first PLA fiber 10, the pulp 20, and the second PLA fiber 30 is passed through the thermally fused portion 700 to thermally melt the laminate.

5, a first PLA fiber layer integrated on the first mesh drum in the form of a web, a pulp layer laminated on one surface of the first PLA fiber layer, and a web layer formed on the second mesh drum, And a second PLA fiber layer laminated on one side of the pulp layer is thermally fused to produce a nonwoven fabric.

(Example 1)

A first PLA fiber layer formed on the first mesh drum by spraying 10% by weight of the total weight of the nonwoven fabric and integrated in the form of a web, a pulp layer formed by spraying 80% by weight of the total weight of the nonwoven fabric on one surface of the first PLA fiber layer, A nonwoven fabric was produced by thermally fusing a second PLA fiber layer on a 2 mesh drum by spraying 10 wt% of the total weight of the nonwoven fabric on a mesh drum and stacking them on a web in the form of a web.

(Example 2)

A first PLA fiber layer formed on the first mesh drum by spraying 25 wt% of the total weight of the nonwoven fabric and integrated in a web form, a pulp layer formed by spraying 50 wt% of the total weight of the nonwoven fabric on one surface of the first PLA fiber layer, The nonwoven fabrics were prepared by spraying 25 wt% of the second PLA fiber layer on the surface of the nonwoven fabric.

(Example 3)

A first PLA fiber layer formed on the first mesh drum by spraying 40 wt% of the total weight of the nonwoven fabric and integrated in a web form, a pulp layer formed by spraying 20 wt% of the total weight of the nonwoven fabric on one surface of the first PLA fiber layer, 2 nonwoven fabrics were prepared by spraying 40 wt% of the second PLA fiber layer on the surface of the non-woven fabric, and then the second PLA fiber layers were laminated on one side of the pulp layer.

(Comparative Example 1)

A first PLA fiber layer on which a 45 wt% of the total weight of the nonwoven fabric is sprayed on the first mesh drum to accumulate in the form of a web, a pulp layer in which 10 wt% The nonwoven fabrics were prepared by spraying 45 wt% of the second PLA fiber layer on the surface of the nonwoven fabric.

(Comparative Example 2)

20% by weight of pulp, 40% by weight of polyethylene (PE) and 40% by weight of polypropylene (PP) were mixed and sprayed together to prepare a nonwoven fabric.

The softness, bulkiness and absorbency of each of the nonwoven fabrics of Examples 1, 2 and 3 and Comparative Examples 1 and 2 were evaluated and shown in Table 1.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Softness ○ ○ ○ × △ Bulky feeling ○ ○ ○ △ △ Absorbency ○ ○ ○ △ ×

As shown in Table 1, in Examples 1, 2 and 3, the first PLA fibrous layer and the second PLA fibrous layer cover the outer surface of the pulp layer to protect the pulp layer and prevent the pulp from being broken or dust- . In addition, it was found that a suitable volume was maintained due to the pulp layer, and a smooth feel was felt, and it was found that the absorbency was excellent.

In Comparative Example 1, the first PLA fibrous layer and the second PLA fibrous layer were formed too thick, and the first PLA fibrous layer and the second PLA fibrous layer were crushed, the texture was rough, and the bulkiness and absorbability were not good. That is, it is preferable that the first PLA fiber layer and the second PLA fiber layer are each used in an amount of 40 wt% or less based on the total weight of the nonwoven fabric.

Further, in Comparative Example 2, the bulkiness and feeling were lower than those of Examples, and the absorbency was not good.

The environmental resistance of each of the nonwoven fabrics of Examples 1, 2 and 3 and Comparative Examples 1 and 2 was evaluated. That is, the nonwoven fabric was sprayed on the entire surface of the nonwoven fabric having passed 50 hours (hr) and 75 hours (hr) before the elapse of time under the same conditions as when the nonwoven fabric was buried in the ground, Respectively.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Force (N) ELong (%) Force (N) ELong (%) Force (N) ELong (%) Force (N) ELong (%) Force (N) ELong (%) Before time 20.5 35.6 23.5 27.6 25.2 28.9 5.1 8.0 19.2 31.6 50 hours elapsed 12.9 6.5 15.9 8.5 16.3 12.0 3.5 4.0 9.0 21.0 75 hours elapsed Not measurable Not measurable Not measurable Not measurable 5.9 9.5

As shown in Table 2, Example 1 exhibited an elongation of 35.6% at 20.5 N before the elapse of time of nonwoven fabric, an elongation of 6.5% at 12.9 N after 50 hours of nonwoven fabric, and after 75 hours of nonwoven fabric Pulp corrosion progressed, and the first PLA fiber and the second PLA fiber could not be measured due to corrosion due to biodegradation.

Example 2 showed an elongation of 27.6% at 23.5N before the elapse of time of the nonwoven fabric, an elongation of 8.5% at 15.9N after 50 hours of the nonwoven fabric, and pulp corrosion after 75 hours of the nonwoven fabric , The first PLA fiber and the second PLA fiber could not be measured due to the tear due to progress of corrosion.

Example 3 showed an elongation of 28.9% at 25.2N before elapse of time of nonwoven fabric, and an elongation of 12.0% at 16.3N after 50 hours of nonwoven fabric. Corrosion of pulp proceeded after 75 hours of nonwoven fabric, Measurement of the first PLA fiber and the second PLA fiber was impossible due to the tear due to progress of the corrosion.

Comparative Example 1 exhibited an elongation of 8.0% at 5.1 N before elapse of time, elongation of 4.0% at 3.5 N after 50 hours of nonwoven fabric, corrosion of the pulp after 75 hours of the nonwoven fabric proceeded, The first PLA fiber and the second PLA fiber could not be measured due to the breakage.

Comparative Example 2 exhibited an elongation of 31.6% at 19.2 N before the elapse of time of nonwoven fabric, 21.0% at 9.0 N after 50 hours of nonwoven fabric, and an elongation of 9.5% at 5.9 N after 75 hours of nonwoven fabric Respectively. In other words, although the corrosion of pulp proceeded, polyethylene (PE) and polypropylene (PP) remained intact.

As described above, according to the present invention, the first PLA fiber, the pulp, and the second PLA fiber having biodegradable properties are laminated in this order to produce a nonwoven fabric, thereby improving the soft characteristics of the pulp, the absorbency and the bulkiness, Thereby providing a nonwoven fabric having improved mechanical strength required for actual use.

In addition, by using pulp, it is possible to reduce the manufacturing cost and provide a nonwoven fabric which does not cause environmental problems as 100% biodegradation after disposal is achieved.

In addition, it provides a nonwoven fabric which does not emit carcinogenic substances or substances harmful to hygiene, has excellent breathability and refreshing sensation, thereby improving hygiene and safety.

In addition, the first and second PLA fibers can be washed by holding the surface of the pulp, thereby providing a nonwoven fabric which can be repeatedly used many times.

100: first PLA fiber manufacturing machine 200: first mesh drum
300: Second PLA fiber making machine 110, 310: Extruder
120, 320: filter device 130, 330: injection nozzle
140,340: Hot air 150,350: Cooler
160,360: Cutter 170,370:
171, 371, 520: valve 400: second mesh drum
500: pulp feeder 510:
600: control unit 700:

Claims

A first PLA fiber fabricator for fiberizing PLA;
A first mesh drum for integrating the first PLA fibers injected in the first PLA fiber producing machine into a web form;
A pulp supplying unit provided at one side of the first mesh drum and stacking pulp on one surface of the first PLA fiber integrated on the first mesh drum;
A second PLA fiber fabricator provided at one side of the pulp supplying section to fiberize PLA;
A second mesh drum for accumulating the second PLA fibers injected from the second PLA fiber producing machine in a web form and stacking the same on one surface of the pulp;
A heat fusing unit for applying heat to the laminated material stacked in the order of the first PLA fiber, the pulp, and the second PLA fiber to mutually thermally fuse the laminated materials; And
And controlling pulp feed amount of the first and second PLA fiber manufacturing machines and pulp feeding parts to control the injection amounts of the first and second PLA fibers manufactured in the first and second PLA fiber manufacturing machines, ;
Wherein the biodegradable nonwoven fabric is produced by a method comprising the steps of:

The method according to claim 1,
The first and second PLA fiber producing machines include an extruder for melting and extruding PLA (biodegradable polylactic acid), an injection nozzle having hundreds of small orifices for injecting the PLA melted in the extruder, A cooler for cooling the elongated PLA; a cutter for cutting the PLA fiber determined by the elongation; and a blower for blowing the cut PLA fibers And an injection port for injecting the biodegradable nonwoven fabric.

3. The method of claim 2,
Further comprising a filter device for filtering the melted PLA between the extruder and the spray nozzle.

3. The method of claim 2,
The extruder is divided into first to fifth regions, wherein the first region is 150 to 160 캜, the second region is 200 to 210 캜, the third region is 220 to 230 캜, the fourth region is 230 to 240 캜, Wherein the temperature of the non-woven fabric is in the range of 250 to 260 캜.

The method according to claim 1,
Wherein the pulp feeding part is connected to a pulverizer for separating pulp fibers made up of sheets or mats into individual fibers.

The method according to claim 1,
The control unit controls the injection amount of the first PLA fiber manufacturing machine so that 10 wt% to 40 wt% of the first PLA fibers are injected relative to the total weight of the nonwoven fabric, and 25 wt% to 80 wt% of pulp is supplied Wherein the amount of the pulp feeder is controlled so that the amount of the second PLA fiber is injected so that 10 to 40 wt% of the second PLA fiber is injected relative to the total weight of the nonwoven fabric.

PLA (biodegradable polylactic acid) is put into an extruder of a first and a second fiber producing machine, respectively, and melted. Then, the PLA is radiated through a spinning nozzle having hundreds of small orifices and a high-pressure hot air blown from both sides of the spinning nozzle Stretching and cooling to produce a first PLA fiber and a second PLA fiber, respectively;
The first PLA fibers produced in the first fiber producing machine are injected onto a first mesh drum and integrated in a web form, and the second PLA fibers produced in the second fiber producing machine are injected onto a second mesh drum A step S20 of integrating the data in the form of a web;
S30 is a step of supplying pulp between the first PLA fibers and the second PLA fibers integrated in the web form to intervene therebetween;
(S40) the first PLA fiber, the pulp, and the second PLA fiber are thermally fused to each other;
Wherein the biodegradable nonwoven fabric is produced by a method comprising the steps of:

8. The method of claim 7,
The extruder has a first region in which the temperature is set at 150 to 160 캜, a second region in which the temperature is set in the range of 200 to 210 캜, a third region in which the temperature in the range of 220 to 230 캜 is set, Wherein the PLA is completely melted by passing through the first to fifth regions, and the PLA is completely melted through the first to fifth regions.

8. The method of claim 7,
Wherein the step (S10) further comprises filtering the molten PLA. &Lt; RTI ID = 0.0 > 8. < / RTI >

8. The method of claim 7,
Wherein the PLA is selected from the group consisting of poly-D-lactic acid, poly-L-lactic acid, copolymers of D-lactic acid and L-lactic acid.

8. The method of claim 7,
Wherein the PLA has a melting point of 100 ° C to 180 ° C, a melt index of 75 to 120g / 10min, and a melt density of 0.98 to 2.24g / cm 3 (260 ° C).

8. The method of claim 7,
Wherein the pulp is obtained by separating pulp fibers made of a sheet or a mat into individual cotton fibers.

8. The method of claim 7,
The first PLA fibers are sprayed in an amount of 10 wt% to 40 wt% of the total weight of the nonwoven fabric, and the pulp is accumulated in an amount of 25 wt% to 80 wt% of the total weight of the nonwoven fabric, 10 wt% to 40 wt% is sprayed onto the surface of the non-woven fabric.

14. A method of manufacturing a multilayer laminate according to any one of claims 7 to 13, comprising: a first PLA fiber layer integrated on a first mesh drum in a web form; A pulp layer laminated on the first PLA fibrous layer; And a second PLA fiber layer which is integrated on the second mesh drum in the form of a web and laminated on the upper surface of the pulp layer is manufactured by mutual thermal fusion welding.