KR101520226B1

KR101520226B1 - Biodegradation Non-Woven Fabric and Manufacturing Apparatus and Manufacturing Method

Info

Publication number: KR101520226B1
Application number: KR1020140088242A
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: WO2016010297A1

Abstract

Provided is an environmentally friendly biodegradable non-woven fabric manufactured by including: a S10 step of putting and melting PLA (biodegradable polylactic acid) into an extruder, spinning the same through a spinning nozzle in which hundreds of small orifices are formed, elongating and cooling the same with high pressure hot wind which is sprayed at high speed from both sides of the spinning nozzle, and fiberizing the same; a S20 step of accumulating the fiberized PLA in a web form on a mesh belt; a S30 step of arranging pulp in layers on the accumulated PLA in the web form; a S40 step of accumulating the PLA fiberized in the S10 step in the web form, and arranging the same in layers; and a S50 step of binding the arranged PLA, pulp, and PLA by heat and combining the same. Also, provided are a manufacturing apparatus thereof and a manufacturing method thereof. According to an embodiment of the present invention, a pulp layer and a PLA layer having biodegradable characteristic are arranged in layers so that softness, absorptiveness, and volume of the pulp layer can be developed. Also, the PLA layers holds and protects the pulp layer so that mechanical intensity needed in real use can be improved and quality of products can be improved. The non-woven fabric can reduce manufacturing costs by using pulp, does not induce environmental problems since the non-woven fabric is totally biodegradable after disuse, does not emit carcinogenic substance or materials which are harmful for hygiene, and has improved hygiene and safety since air permeability and refreshment are excellent. The PLA layer holds surfaces of the pulp layers, thereby being washed and repeatedly used.

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. More particularly, the present invention relates to an environmentally friendly biodegradable nonwoven fabric which improves the mechanical properties by improving the absorbency, softness, And a manufacturing method thereof.

In general, nonwoven fabric refers to nonwoven fibers. It means fiber aggregate not by spun yarn, weaving or braiding, it is a sheet aggregated 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,

An object of the present invention is to provide a pulp which has excellent softness, water absorbency and bulkiness and which has excellent physical properties on the outer surface of a pulp laminated with polylactic acid (PLA) to improve physical properties while absorbing water, softness and bulkiness, And a method of manufacturing the same, and a method of manufacturing the same.

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 mesh belt provided at a lower portion of the first PLA fiber producing machine to accumulate vertically injected PLA fibers in a web form; A pulp supplying unit provided on one side of the first PLA fiber producing machine and stacking pulp on PLA fibers integrated on the mesh belt; A second PLA fiber fabricator provided on one side of the pulp feeder, the PLA fiber fabricating the PLA into a web form on the pulp; A heat fusing unit for applying heat to the laminated material stacked in the order of the PLA fiber, the pulp and the PLA fiber to mutually thermally fuse the laminated materials; And controlling the injection amount of PLA fibers produced in the first and second PLA fiber manufacturing machines, electrically connected to the first and second PLA fiber producing machines, the mesh belts, and the pulp feeding parts, and controlling the pulp feeding amount of the pulp feeding parts And a control unit for controlling a conveying speed of the mesh belt.

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 melted biodegradable poly lactic acid (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 PLA fibers are injected relative to the total weight of the nonwoven fabric, and the pulp is fed to the pulp so that 25 wt% to 80 wt% Controlling the supply amount of the supply part, and controlling the injection amount of the second PLA fiber manufacturing machine so that 10 wt% to 40 wt% of PLA fibers are injected to the total weight of the nonwoven fabric.

A method of manufacturing an environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention includes the steps of spinning a PLA (biodegradable polylactic acid) into an extruder and melting it through a spinning nozzle having hundreds of small orifices formed therein, A step S10 of stretching and cooling the fiber by high-pressure hot air sprayed at high speed to form fibers; Integrating the fibrous PLA in a web form on a mesh belt; Step S30 of depositing pulp on PLA integrated in the web form; (S40) of stacking the fibrous PLA in the form of a web on the pulp in step S10; And a step S50 of thermally fusing and bonding the laminated PLA, pulp and PLA.

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 PLA is sprayed in an amount of 10 to 80% by weight of the total weight of the nonwoven fabric, and the pulp is accumulated in an amount of 25 to 80% by weight of the total weight of the nonwoven fabric. More specifically, the PLA is sprayed in an amount of 10 wt% to 40 wt% in step S20, and is accumulated in step S40 in an amount of 10 wt% to 40 wt%.

The environmentally friendly biodegradable nonwoven fabric according to one embodiment of the present invention comprises a first PLA fiber layer injected onto a mesh belt by the above-described manufacturing method and integrated in a web form; A pulp layer laminated on the first PLA fibrous layer; And the second PLA fiber layers sprayed on the pulp layer and integrated in a web form are thermally fused to each other.

The embodiment of the present invention makes use of the lamination of the pulp layer and the PLA layer having the biodegradation characteristics to make the pulp layer soft, absorbable and bulky, and the PLA layer catches and protects the pulp layer to improve the mechanical strength required in actual use Thereby improving the quality of the product.

In addition, the use of pulp can reduce the manufacturing cost and does not cause environmental problems as 100% biodegradation after disposal occurs.

In addition, it does not emit a carcinogenic substance or a substance harmful to hygiene, has excellent air permeability and refreshing sensation, and has an effect of improving hygiene and safety.

In addition, the PLA layer can be washed by holding the surface of the pulp layer, and thus the PLA layer 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, and FIG. 2 is a block diagram for explaining an overall configuration of an apparatus for manufacturing an environmentally biodegradable nonwoven fabric according to an embodiment of the present invention And FIG. 3 is a block diagram for explaining the construction of first and second PLA fiber production apparatuses in an apparatus for manufacturing environmentally friendly biodegradable nonwoven fabric according to an embodiment of the present invention.

1 and 2, an apparatus for manufacturing an environmentally friendly biodegradable nonwoven fabric includes first and second PLA fiber production machines 100 and 300, a pulp feeder 200, a mesh belt 400, a controller 500, 600).

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 cm to 16 cm, and hot air having a high velocity distribution forms a variety of filaments between 0.1 and 500 microns in diameter.

A pulp feeder 200 is disposed between the first PLA fiber machine 100 and the second PLA fiber machine 300.

The pulp feeder 200 may directly feed the pulp, but the pulp feeder 200 is connected to the pulverizer 210 for separating the pulp fibers made up of sheets or mats into individual fibers, Pulp of individual fibers may also be supplied.

The first PLA fiber producing machine 100 and the pulp supplying part 200 are disposed side by side and the mesh belt 400 is provided below the second PLA fiber producing machine 300.

The mesh belt 400 collects and transports the first and second PLA fibers and pulp injected from the first PLA fiber producing machine 100, the pulp supplying part 200 and the second PLA fiber producing machine 300 in the form of a web .

The first PLA fiber manufacturing machine 100, the pulp feeding part 200 and the second PLA fiber manufacturing machine 300 are electrically connected to the control part 500, respectively.

The control unit 500 controls the first PLA fabricator 100, the pulp supplier 200 and the valves 171, 220 and 371 of the second PLA fabricator 300 to rotate the first and second PLA fabricators 300, Controlling the injection amount of the second PLA fiber and the pulp and controlling the jetting time difference so that the first PLA fiber is injected first, the pulp is injected onto the first PLA fiber, and the second PLA fiber is injected onto the pulp .

A heat-sealed portion 600 is provided on one side of the mesh belt 400.

The heat-welded portion 600 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 mesh belt 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 PLA (biodegradable polylactic acid) in an extruder, melting it, spinning it through a spinning nozzle having hundreds of small orifices formed therein, Step S10 of stretching and cooling the fibers by high-pressure hot air jetted from both sides at high speed to form fibers; Integrating the fibrous PLA in the form of a web on a mesh belt; Step S30 of laminating the pulp on PLA integrated in a web form; Step S40 of stacking the fibrous PLA in the form of a web on the pulp in step S10; And a step S50 of bonding and bonding the laminated PLA, pulp, and PLA by heat fusion.

Step S10 is performed in the first PLA fiber producing machine 100 and the second PLA fiber producing machine 200. [ First, PLA (biodegradable polylactic acid) is put into the extruder 110 of the first PLA fiber producing machine 100 and melted.

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 extruder 110 has a first region in which the temperature is set at 150 to 160 캜, a second region in which the temperature in the range of 200 to 210 캜 is set, a third region in which the temperature in the range of 220 to 230 캜 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 extruder 110.

Then, the fully dissolved PLA is filtered into the filter device 120 and supplied to the injection nozzle 130, and the PLA supplied to the injection nozzle 130 is injected through hundreds of small orifices.

Then, the injected PLA is stretched by high-pressure hot air blowing at high speed in the blower 140, cooled by a cooler, and made into fiber.

The fibrous PLA is then cut into a cutter 160 and injected through the injection port 170. At this time, the first PLA fiber injected into the injection port 170 is injected in an amount of 10% by weight to 40% by weight based on the total weight of the nonwoven fabric.

Step S20 integrates the first PLA fibers injected onto the mesh belt 400 in a web form. 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.

Step S30 stacks the pulp injected from the pulp feeder 200 onto the first PLA fibers that are integrated and transported in a web form. At this time, the pulp to be laminated is sprayed at 25 wt% to 80 wt% with respect to the total weight of the nonwoven fabric.

In step S40, the second PLA fiber is laminated on the pulp. The second PLA fiber is produced through the second PLA fiber making machine 300 in the same manner as in step S10.

More specifically, the PLA is introduced into the extruder 310 of the second PLA fiber producing machine 300, and the PLA is completely dissolved while passing through the first to fifth regions of the extruder 310. The fully dissolved PLA is then filtered by the filter device 320 and supplied to the injection nozzle 330 and injected through hundreds of small orifices. Then, the injected PLA is drawn by the high-pressure hot air of the blower 340 and cooled by the cooler 350 to be fiberized. Then, the fibrous PLA is cut into the cutter 360 and injected through the injection port 370. At this time, the second PLA fibers injected into the injection port 370 are injected in an amount of 10% by weight to 40% by weight based on the total weight of the nonwoven fabric.

As such, the second PLA fibers produced in the second PLA fiber making machine 300 are integrated in a web form on the pulp.

In step S50, the laminated material laminated on the mesh belt 400 in the order of the first PLA fiber, the pulp, and the second PLA fiber is passed through the heat-sealed part 600 to thermally fuse the laminated material.

As shown in FIG. 5, the environmentally-friendly biodegradable nonwoven fabric manufactured by the above manufacturing method comprises a first PLA fiber layer sprayed on a mesh belt 400 and integrated in a web form, a pulp layer laminated on the first PLA fiber layer, And a second PLA fiber layer sprayed onto the pulp layer and integrated in the form of a web.

(Example 1)

A first PLA fiber layer on which a 10% by weight based on the total weight of the nonwoven fabric is sprayed on the mesh belt, and which is integrated in a web form; a pulp layer in which 80% by weight of the total weight of the nonwoven fabric is sprayed and laminated on the first PLA fiber layer, 10% by weight based on the total weight of the nonwoven fabric was injected to form a second PLA fiber layer integrated in a web form, and the nonwoven fabric was prepared by heat-sealing them.

(Example 2)

A first PLA fiber layer on which a 25% by weight of the total weight of the nonwoven fabric is sprayed on the mesh belt to be accumulated in a web form, a pulp layer in which 50% by weight of the total weight of the nonwoven fabric is sprayed and laminated on the first PLA fiber layer, 25% by weight based on the total weight of the nonwoven fabric was injected to form a second PLA fiber layer integrated in a web form, and the nonwoven fabric was produced by mutual heat fusion.

(Example 3)

A first PLA fiber layer on which a 40% by weight of the total weight of the nonwoven fabric is sprayed on the mesh belt to be accumulated in a web form, a pulp layer in which 25% by weight of the total weight of the nonwoven fabric is sprayed and laminated on the first PLA fiber layer, 40% by weight based on the total weight of the nonwoven fabric was injected to form a second PLA fiber layer integrated in a web form, and the nonwoven fabric was prepared by heat-sealing them.

(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 mesh belt to be accumulated in a web form, a pulp layer in which 10 wt% To form a second PLA fiber layer in the form of a web. The nonwoven fabrics were thermally fused with each other to produce a 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, an elongation of 6.5% at 12.9 N after 50 hours of the nonwoven fabric, Thereafter, the corrosion of the pulp proceeded, and the corrosion of the first PLA fiber and the second PLA fiber due to biodegradation proceeded and measurement was impossible.

Example 2 showed an elongation of 27.6% at 23.5N before the elapse of time, an elongation of 8.5% at 15.9N after 50 hours of the nonwoven fabric, and corrosion of the pulp after 75 hours of the nonwoven fabric And the first PLA fiber and the second PLA fiber were torn due to the progress of corrosion and measurement was impossible.

In Example 3, the elongation was 28.9% at 25.2 N before elapsed time of the prepared nonwoven fabric, and the elongation was 12.0% at 16.3 N after 50 hours elapsed from the nonwoven fabric. After 75 hours of nonwoven fabric, And the first PLA fiber and the second PLA fiber could not be measured due to the tear due to progress of corrosion.

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

Comparative Example 2 exhibited an elongation of 31.6% at 19.2 N before the elapse of time, an elongation of 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 the nonwoven fabric. %. 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 pulp layer and the PLA layer having biodegradable characteristics are laminated to improve the soft characteristics, the absorbency and the bulkiness of the pulp layer, and the PLA layer catches and protects the pulp layer, thereby improving the mechanical strength required in actual use.

In addition, it is possible to reduce the manufacturing cost by using pulp, and it does not cause environmental problems as 100% biodegradation after disposal occurs.

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

In addition, the PLA layer can be washed by holding the surface of the pulp layer, thereby enabling repeated use many times.

100: first PLA fiber manufacturing machine 200: pulp supplier
210: Smoothing machine 300: Second PLA fiber making machine
110, 310: extruder 120, 320:
130, 330: injection nozzle 140, 340:
150, 350: cooler 160, 360: cutter
170,370: jetting port 171, 220, 371: valve
400: mesh belt 500:
600:

Claims

A first PLA fiber fabricator for fiberizing PLA;
A mesh belt provided at a lower portion of the first PLA fiber producing machine to accumulate vertically injected PLA fibers in a web form;
A pulp supplying unit provided on one side of the first PLA fiber producing machine and stacking pulp on PLA fibers integrated on the mesh belt;
A second PLA fiber fabricator provided on one side of the pulp feeder, the PLA fiber fabricating the PLA into a web form on the pulp;
A heat fusing unit for applying heat to the laminated material stacked in the order of the PLA fiber, the pulp and the PLA fiber to mutually thermally fuse the laminated materials; And
A control unit electrically connected to the first and second PLA fiber producing machines and the pulp supplying unit to control an injection amount of PLA fibers produced in the first and second PLA fiber producing machines and to control the amount of pulp supplied to the pulp supplying units;
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 PLA fibers are injected relative to the total weight of the nonwoven fabric, and the pulp is fed to the pulp so that 25 wt% to 80 wt% Controlling the supply amount of the supply part and controlling the injection amount of the second PLA fiber manufacturing machine so that 10 wt% to 40 wt% of PLA fibers are injected to the total weight of the nonwoven fabric.

PLA (biodegradable polylactic acid) is put into an extruder and melted. Then, the PLA is radiated through a spinning nozzle in which hundreds of small orifices are formed, and is stretched and cooled by high-pressure hot air blown at high speed from both sides of the spinning nozzle, Step S10;
Integrating the fibrous PLA in a web form on a mesh belt;
Step S30 of depositing pulp on PLA integrated in the web form;
(S40) of stacking the fibrous PLA in the form of a web on the pulp in step S10; And
(S50) of bonding the PLA, the pulp, and the PLA to each other by thermally fusing
Containing biodegradable nonwoven fabric.

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,
Wherein the PLA is sprayed in an amount of 10% to 80% by weight of the total weight of the nonwoven fabric, and the pulp is fed from 25% by weight to 80% by weight of the total weight of the nonwoven fabric.

14. The method of claim 13,
Wherein the PLA is sprayed in an amount of 10 to 40% by weight in step S20 and accumulated in step S40 in an amount of 10 to 40% by weight.

15. A method of manufacturing a laminate, comprising the steps of: forming a first PLA fiber layer on a mesh belt in a web form; A pulp layer laminated on the first PLA fibrous layer; And a second PLA fiber layer sprayed on the pulp layer and integrated in a web form are manufactured by mutual thermal fusion welding.