WO2010095806A2 - Mulching sheets manufacturing method, sheets for environment friendly farming and manufacturing method thereof - Google Patents

Abstract

The manufacturing method of mulching sheets of the present invention comprises: introducing a 1st mixture into a 1st extruder, the 1st mixture prepared by mixing a raw material composed of polyethylene or polypropylene materials in powder or pellet form, a foaming agent and calcium carbonate; introducing a 2nd mixture into a 2nd extruder, the 2nd mixture prepared by mixing a raw material composed of polyethylene or polypropylene materials in powder or pellet form with calcium carbonate; introducing a 2nd mixture into a 3rd extruder, the 2nd mixture prepared by mixing a raw material composed of polyethylene or polypropylene materials in powder or pellet form with calcium carbonate; performing a simultaneous blow molding of the 1st mixture discharged from the 1st extruder, the 2nd mixture discharged from the 2nd extruder and the 2nd mixture discharged from the 3rd extruder via a single outlet such that the 1st mixture components are disposed on the outer surface of a mold, and the 2nd mixtures discharged, respectively, from the 2nd and 3rd third extruders are disposed on the middle and inner surfaces in that order; and cutting the blow mold into vertical sections to put the cut blow molds around a tube, making each mold spread out in a sheet form.

Description

Manufacturing method of mulching sheet, eco-friendly agricultural sheet and manufacturing method

The present invention relates to a method for producing a mulching sheet, an agricultural sheet and a method for producing the same.

Mulching sheets (mulching sheets) are sheets of constant thickness for spreading in orchards, horticulture and paddy fields and fields, and covered with soil or fixed with fixtures, and are almost essential as agricultural supplies for preventing or suppressing weed growth. It is used.

The method of using the mulching sheet may be slightly different depending on the use or crop cultivation method, but the following method is generally used.

That is, in the case of paddy field, select the one suitable for the width, spread the mulching sheet according to its length, and fix it to the soil by using a fixture at regular intervals on both sides.

As the sheet is coated, the sun is blocked and weeds do not grow, so the herbicidal effect is excellent without using pesticides.

However, due to the characteristics of the mulching sheet, it is not breathable and water-permeable, so in the case of soil coated for a long time, microorganisms in the soil cannot grow, and due to sealing, the roots of plants in the soil are necrotic and the strength of the soil is weakened and collapsed. The herbicidal effect is excellent, but it is not environmentally friendly in the sense of preserving the natural state.

In addition, it is slippery to walk, especially slippery after the rain or rain, the situation of safety accidents due to the aging, feminization of the countryside is adding.

In addition, as the interest in environmental protection and safe agricultural products has increased recently, the demand for agricultural products using environmentally friendly organic farming methods has increased. Because organic farming limits the use of synthetic fertilizers and pesticides, the use of conventional herbicides is strictly regulated.

On the other hand, weeds that thrive on rice fields and field banks require a lot of effort and cost to be removed. Especially, since the agricultural labor force is feminized and aging recently, the grievance is a considerable task. In order to reduce the weeding grievances, agricultural sites suppress the transmission of weeds by covering them with a general mulching film. However, rice fields and field banks have a function of passage and movement transportation in farmland. It is easily torn due to pressure, and if there is moisture on the surface, it is slippery and there is a risk of injury due to falling, and it is also difficult to collect after use, damaging the aesthetics and remaining inside the soil, causing secondary environmental pollution. In addition, the soil covered with the mulching film is not ventilated due to the humidity generated in the soil may cause the soil to rot.

Accordingly, an object of the present invention is to provide a method for producing a mulching sheet having excellent breathability and water permeability, and having an anti-slip function.

In another aspect, the present invention is to provide a method for producing an environmentally friendly agricultural sheet using polyethylene to solve the above problems.

The present invention to achieve the above object is (A) a raw material in the form of powder or pellets made of polyethylene or polypropylene material; blowing agent; Injecting the primary mixture prepared by mixing calcium carbonate into the inlet of the first extruder; (B) a raw material in powder or pellet form composed of polyethylene or polypropylene material; Injecting a secondary mixture prepared by mixing calcium carbonate into an input unit of a second extruder; (C) a raw material in powder or pellet form composed of polyethylene or polypropylene material; Injecting a secondary mixture prepared by mixing calcium carbonate into an inlet of a third extruder; (D) The primary mixture discharged from the first extruder, the secondary mixture discharged from the second extruder, and the secondary mixture discharged from the third extruder are simultaneously blow-molded through one discharge port so that the primary mixture is formed on the outer surface of the molding. Shaping the components so that the secondary mixture discharged from the second extruder and the third extruder is located in the middle side and the inner side, respectively; And (E) cutting the longitudinal section of the blow molding to wind the cut blow molding into a sheet to open each sheet in the form of a sheet.

In addition, the present invention to achieve the above object (a) a step of injecting a polyethylene mixture mixed by adding an antioxidant to the pellet-type raw material consisting of polyethylene material to the input unit of the first extruder; (b) injecting a polyethylene mixture mixed by adding ethylene vinyl acetate to a pellet-type raw material made of polyethylene material into an input unit of a second extruder; (c) The polyethylene mixture discharged from the first extruder and the polyethylene mixture discharged from the second extruder are blow molded simultaneously through one discharge port so that the polyethylene mixture component discharged from the first extruder is located on the outer side of the molding, and Molding the side of the polyethylene mixture component withdrawn from the second extruder; (d) cutting the longitudinal section of the blow molding to process the cut blow molding into a sheet form; And (e) drilling a plurality of holes having a predetermined size in the sheet obtained above.

The mulching sheet manufacturing method of the present invention is a fine mulching sheet to form a fine cell is excellent in breathability and water permeability, so that it can supply moisture and air to the soil smoothly to prevent long-term side effects that occur in the closed soil cover Can be provided.

In addition, since it does not interfere with the growth of microorganisms in the soil, it is possible to provide a mulching sheet with excellent herbicidal effect to prevent weeds while maintaining the natural state.

In addition, the manufacturing method of the mulching sheet of the present invention can provide a mulching sheet excellent in the anti-slip function.

In addition, the manufacturing method of the mulching sheet of the present invention can be produced by varying the composition ratio of the mixture of each layer as well as providing an excellent mulching sheet because the mixture composed of polyethylene or polypropylene material is crimped in three layers. Therefore, it is possible to provide a mulching sheet that can also control the ventilation and water flow rate and the durability of the product.

As described above, the agricultural sheet manufactured from the present invention has a hole in the original state even if the soil is covered for a long time by aeration through the aeration

It can be said that it is eco-friendly by preventing the use of herbicides by preventing the use of herbicides. Especially, organic farming areas are prohibited from using herbicides on rice fields, which can eliminate the labor of weed removal by 4-5 times / year manpower. In addition, it prevents rice fields from collapsing and leaks, prevents hibernation of stink bugs, rice baskets, etc., and prevents pests, and prevents accidents due to non-slip treatment of the outer surface.

In addition, the agricultural sheet manufactured from the present invention can be collected after long-term use, can be processed and reused in the form of pellets can be used to save resources by reducing waste and environmentally friendly and reduce social costs.

Hereinafter will be described in detail by breaking down the problem solving means of the present invention step by step.

Step 1: a raw material in powder or pellet form composed of polyethylene or polypropylene material; blowing agent; Injecting the primary mixture prepared by mixing calcium carbonate into the inlet of the first extruder

Step 1 is a raw material in the form of powder or pellets made of polyethylene or polypropylene material; blowing agent; A step of injecting the primary mixture prepared by mixing calcium carbonate into the inlet of the first extruder.

On the other hand, the present invention, in the mulching sheet used for agriculture, while supplying moisture and air to the crop smoothly, while producing a mulching sheet having a non-slip function when used in rice fields and field banks or orchards and gardening, polyethylene or polypropylene Raw material in pellet form composed of material; Blowing agents in pellet or powder form; The primary mixture is prepared by mixing calcium carbonate, which is a component located on the outer side of the mulching sheet. The outer surface of the mulching sheet composed of the primary mixture should be excellent in breathability and water permeability to directly contact with moisture and air in supplying water and air to the soil, and molded to prevent slippage when used in rice fields. In part, the primary mixture must be a raw material in pellet form composed of polyethylene or polypropylene material; Blowing agents in pellet or powder form; It should contain calcium carbonate.

Polyethylene (polyethylene) used in the present invention is excellent in flexibility, excellent in water resistance and electrical insulation, and well resistant to ultraviolet rays, acids or alkalis, and does not lose flexibility even at low temperatures, and is also strong in impact.

Meanwhile, the polyethylene material used in the present invention is not limited to a specific kind, but preferably, 20 to 80 wt% of LDPE (Low Density Polyethylene) and 20 to 80 wt% of LLDPE (Linear Low Density Polyethylene) is preferable. .

Polypropylene has excellent electrical insulation, resistance to shock and high heat resistance.

On the other hand, in the manufacturing of the mulching sheet of the present invention, the foaming agent forms a dense and fine cell, thereby making it possible to produce a mulching sheet excellent in breathability and water permeability, as well as a frictional force on the surface of the mulching sheet produced from the present invention. To give an anti-slip effect. Although the blowing agent used in the present invention is not limited to a specific kind, it is preferable that it is azodicarbonamide.

On the other hand, calcium carbonate (CaCO3) increases the cohesion and cohesion between the components of the primary mixture, and as the inorganic material is added to the polymer affects the production of a mulching sheet excellent in breathability and water permeability.

On the other hand, the primary mixture may preferably further comprise an antioxidant, because it can prevent oxidation due to ultraviolet rays and heat.

Step 2: a raw material in powder or pellet form composed of polyethylene or polypropylene material; Injecting a secondary mixture prepared by mixing calcium carbonate into the inlet of the second extruder

Step 2 is a raw material in the form of powder or pellets made of polyethylene or polypropylene material; The secondary mixture prepared by mixing calcium carbonate is introduced into the input unit of the second extruder.

The secondary mixture prepared in step 2 is a component that is pressed into the primary mixture prepared in step 1, the secondary mixture must also be excellent in breathability and water permeability, so the raw material in the form of pellets made of polyethylene or polypropylene material; Prepared by mixing calcium carbonate.

On the other hand, in the present invention, the raw material in the form of pellets composed of a polyethylene material which is a component of the secondary mixture; Specific description of the calcium carbonate is the same as described in step 1.

On the other hand, the secondary mixture preferably further comprises cellulose (Cellulose).

On the other hand, the secondary mixture may preferably further comprise an antioxidant, the detailed description thereof is the same as described in step 1 above.

Step 3: Raw material in powder or pellet form composed of polyethylene or polypropylene material; Injecting the secondary mixture prepared by mixing calcium carbonate into the input unit of the third extruder

This step 3 is a raw material in the form of powder or pellets made of polyethylene or polypropylene material; The secondary mixture prepared by mixing calcium carbonate is introduced into a third extruder input unit.

In the present invention, the same secondary mixture prepared in step 2 is introduced into the third extruder to prepare a mulching sheet having excellent strength as well as breathability and water permeability.

On the other hand, the mulching sheet produced from the present invention is the primary mixture discharged from the first extruder, the second extruder and the second mixture discharged from each of the third extruder is eluted through a single discharge port is molded at the same time to be pressed in three layers Because it is made, the strength is excellent, and the amount of aeration and water permeation can be controlled by varying the composition ratio of each layer.

Step 4: The primary mixture discharged from the first extruder, the secondary mixture discharged from the second extruder, and the secondary mixture discharged from the third extruder are blow molded simultaneously through one discharge port so that the primary mixture is formed on the outer surface of the molding. Forming the components so that the secondary mixture discharged from the second extruder and the third extruder is positioned in order on the medial side and the inner side, respectively.

In this step 4, the primary mixture discharged from the first extruder, the secondary mixture discharged from the second extruder, and the secondary mixture discharged from the third extruder are blow-molded at the same time through one discharge port, so that the primary surface The step of forming the mixture component is formed so that the secondary mixture discharged from the second extruder and the third extruder are located in the middle side and the inner side, respectively.

Blow molding is a method of molding by injecting raw materials and supplying air using a compressor to the inside of the tube when the raw materials are dissolved and eluted through the discharge port through the extruder. In the present invention, the primary mixture is discharged from the first extruder and the secondary mixture discharged from the second extruder and the third extruder simultaneously blow molding through the discharge port, the primary mixture is on the outer side of the molding, the middle side and the inner side In the mulch sheet may be prepared so that the secondary mixture discharged from the second extruder and the third extruder are located in sequence.

Step 5: cutting the longitudinal section of the blow molding and winding the cut blow molding into the paper tubes to unfold each of the blow moldings in a sheet form.

This step 5 is a step of winding the cut pipe formed by cutting the longitudinal cross-section of the blow molded product to each of the sheet blown to form a sheet.

Since the blow molding produced in step 4 is a continuous form, it is difficult to use as a mulching sheet. Accordingly, the present invention is to cut the longitudinal cross-section of the moldings that are connected to each other to unfold the blow moldings in the form of a sheet, respectively, to easily wind the paper pipe for transportation and storage. The mulching sheet thus made is a single-layered one-piece integral form that simultaneously compresses three-ply vinyl with fine cells, and has excellent breathability, water permeability and strength while preventing slipping.

Next, another problem solving means of the present invention will be described in detail by step by step.

Step 1: Add antioxidant to pellet-type raw material composed of polyethylene

The mixed polyethylene mixture into the input part of the first extruder

This step 1 is to add an antioxidant to the raw material of the pellet form consisting of polyethylene material

In this step, the mixed polystyrene mixture is added to the input unit of the first extruder.

It prevents weeds of paddy fields and paddy fields, eliminating the need for cumbersome weeding and preventing the deterioration of soil due to the use of herbicides. It also prevents rice and crops from growing properly due to weeds, prevents rice fields and field banks from collapsing, and is a two-layered, integrally-used polyester material that can be used for many years and can be recycled after disposal. A product is required. Meanwhile, in the present invention, the polyethylene material is not limited to a specific kind, but preferably, low density polyethylene (LDPE), high density polyethylene (HDPE), or linear low density polyethylene (LLDPE) is preferable.

On the other hand, in the present invention, the polyethylene mixture introduced into the inlet of the first extruder preferably further includes a color masterbatch, the color masterbatch being colored pellets, to impart color to the agricultural sheet produced in the present invention.

On the other hand, the polyethylene mixture includes an antioxidant, in order to prevent oxidation due to ultraviolet rays and heat since the agricultural sheet of the present invention is exposed to the atmosphere for a long time. mountain

The antioxidant is not limited to a specific kind, but most preferably, it is a phenolic antioxidant or thioester.

Step 2: adding the polyethylene mixture mixed by adding ethylene vinyl acetate to the pellet-type raw material made of polyethylene material to the input unit of the second extruder

This step 2 is ethylene vinyl acetate in a pellet-type raw material composed of polyethylene

A stage in which the polyethylene mixture mixed with tate is added to the inlet of the second extruder

It is a system.

The present invention is to add a polyethylene mixture mixed by adding ethylene vinyl acetate to a pellet-type raw material made of polyethylene material into the inlet of the second extruder, in order to produce a sheet molded integrally with the polyethylene mixture in step 1 .

On the other hand, in the present invention, the polyethylene mixture introduced into the inlet of the second extruder preferably further includes a color masterbatch, which is a colored pellet and imparts color to the agricultural sheet produced in the present invention.

On the other hand, in the present invention, the polyethylene mixture introduced into the second extruder may preferably be added 5-30% by weight (w / w) of calcium carbonate, which may increase cohesion and cohesion and improve dispersibility. It is preferable to form a microcapsules coated with stearic acid, and to reduce the use of relatively expensive polyethylene, thereby reducing the material cost, and it is economical if incinerated for disposal, and also reduces the amount of dioxins generated. In addition, by encapsulating calcium carbonate with stearic acid, the dispersion of calcium carbonate is good, there is no foreign matter on the product, and calcium carbonate has the advantage of increasing the heat resistance of the agricultural sheet of the present invention.

Step 3: draining the polyethylene mixture from the first extruder and the second extruder

The polyethylene mixture to be ejected is blow-molded simultaneously through one discharge port so that the polyethylene mixture component discharged from the first extruder is located on the outer side of the molding, and the polyethylene mixture component discharged from the second extruder is located on the inner side of the molding. step

In this step 3, the polyethylene mixture discharged from the first extruder and the polyethylene mixture discharged from the second extruder are blow-molded at the same time through one discharge port so that the polyethylene mixture component discharged from the first extruder is located on the outer side of the molding, A step of forming the polyethylene mixture component discharged from the second extruder is located on the inner side.

Blow molding is a method in which a raw material is injected into an extruder and is formed by supplying air into a blower using a blower. The present invention provides a blow molding process for a polyethylene mixture discharged from a first extruder and a polyethylene mixture discharged from a second extruder. The polyethylene mixture component of the first extruder is placed on the outer side of the molding and the polyethylene mixture of the second extruder is positioned on the inner side of the molding so that the two layers are integrally molded so that it is partially functional, durable and economical. Agricultural sheets can be produced.

Step 4: cutting the longitudinal section of the blow molding to process the cut blow molding into a sheet form

This step 4 is to cut the longitudinal section of the blow molding to process the cut blow molding to form a sheet.

The blow molding produced in step 3 is used as a sheet because it is a continuous form

It is difficult to use. Accordingly, the present invention is to process the blow molding to be unfolded in the form of a sheet by cutting the longitudinal cross-section of the moldings that are connected to each other.

On the other hand, the present invention is a blow property cut by cutting the longitudinal section of the blow molding

Processing the mold to unfold in sheet form; Thereafter, further, stamping the uneven pattern on the outer surface of the sheet obtained above; It may include. Before winding the sheet obtained above to the winder, through the cylindrical roller of 1m ~ 2m in length, 30mm ~ 200mm in diameter uneven pattern is stamped on the sheet and wound on the winder. The outer surface of the seat is a part exposed to the atmosphere, and due to the imprinted pattern, it is possible to reduce safety accidents by preventing slipping during traffic and work.

step 5: a plurality of holes having a constant size in the sheet obtained above

system

This step 5 is a step of drilling a plurality of holes having a constant size in the sheet obtained above.

The present invention drills a plurality of holes at regular intervals to a suitable size in the sheet obtained in the step 5, which facilitates the passage of aeration in the soil covered with the sheet to prevent soil decay by being sealed with the atmosphere for a long time and soil You can protect the ecosystem by maintaining its original state.

On the other hand, the hole perforated in the obtained sheet may be sized for aeration ventilation,

It is preferable that the diameter of 1mm ~ 10mm, and a plurality of holes having a constant size should be drilled so that the area of the hole relative to the total area does not exceed 0.5 ~ 20%.

Hereinafter, the content of the present invention will be described in more detail in the following examples, but the scope of the present invention is not limited only to the following examples, and includes modifications of equivalent technical ideas.

Example 1: Mulching Sheet Preparation

Raw material in pellet form composed of polyethylene material; Blowing agents in pellet or powder form; Calcium carbonate; A primary polyethylene mixture prepared by mixing an antioxidant as an input unit of a first extruder, a raw material in pellet form of polyethylene; Calcium carbonate; After the second polyethylene mixture prepared by mixing the antioxidant is introduced into the second extruder and the third extruder, respectively, the primary polyethylene mixture discharged from the first extruder through blow molding is disposed on the outer side and the second extruder. The secondary polyethylene mixture exiting from the blow molding was simultaneously blown through one outlet so that the secondary polyethylene mixture exiting from the third extruder was in turn located on the inner side. The mulching sheet was prepared by cutting the longitudinal cross-section of the blow molding product so that the cut moldings were unfolded in the form of sheets, respectively, and wound around the branch pipe to facilitate storage and transportation.

Experimental Example 1: Slip Angle Measurement

After covering the mulching sheet and the general sheet prepared in Example 1 on a glass plate of a certain size, the angle of the inclined plate was measured by raising the angle of the inclined plate using an acrylic plate.

Table 1

	Angle)
Anti-slip sheet	26.1
Plain sheet	12.3

As a result of measuring the slip angle (Table 1), the mulching sheet showed a higher angle than the general sheet.

From the above results, the mulching sheet manufactured from the present invention was confirmed that the problem of the general sheet can be solved by excellent anti-slip function.

Experimental Example 2: Water vapor transmission rate

In Experimental Example 2, the moisture permeability (g / m 2 24hr) of the mulching sheet prepared in Example 1 was measured according to ASTM E 96-63 (temperature: 37.8 ° C humidity 90% R.H.)

TABLE 2

	Water vapor permeability (g / ㎡ 24hr)
Example 1	4900
General Mulching Sheet	3100

As a result of measuring the water vapor transmission rate (Table 2), it was confirmed that the water vapor transmission rate of Example 1 prepared from the present invention is superior to the general mulching sheet.

Experimental Example 3: Expanding the surface of the prepared mulching sheet

Using an electron microscope, the mulching sheet surface prepared in Example 1 was observed at 50 magnification and 80 magnification.

As a result of enlarging the mulching sheet at 50 magnification and 80 magnification with an electron microscope, it was confirmed that dense and fine cells were formed on the mulching sheet surface.

Next, the agricultural sheet manufacturing method of the present invention will be described with reference to the following preferred embodiments. However, the scope of the present invention is not limited only to the following examples, and includes modifications of equivalent technical ideas.

Example 1: Agricultural Sheet Preparation

Pellets made of polyethylene material are made of antioxidant and carbon

Polyethylene mixture was added to the first extruder, and the polyethylene mixture was mixed by adding ethylene vinyl acetate and black masterbatch made of carbon to the pellet-type raw material. After input to the inlet of the extruder, the polyethylene mixture discharged from the first extruder and the polyethylene mixture discharged from the second extruder are blow molded at the same time through one discharge port so that the polyethylene mixture component discharged from the first extruder on the outer surface of the molding And the polyethylene mixture discharged from the second extruder was placed on the inner side of the molding. After cutting the longitudinal section of the blow molding to spread the cut blow molding in the form of a sheet, the resulting sheet is passed through a roller stamped with an uneven pattern to imprint the pattern on the outer surface to be a non-slip treatment and to an appropriate size A plurality of holes were drilled at regular intervals to produce an agricultural sheet.

Comparative Example 1 Manufacture of Agricultural Sheet without Ethylene Vinyl Acetate (EVA)

An agricultural sheet was manufactured in the same manner as in Example 1, but an agricultural sheet (Comparative Example 1) was prepared without adding ethylene vinyl acetate.

Comparative Example 2: Production of Agricultural Sheets without Punching

An agricultural sheet was manufactured in the same manner as in Example 1, but the agricultural sheet was prepared without punching the obtained sheet.

Experimental Example 1: Comparison of Strength of Produced Sheets

The mechanical properties of the agricultural sheet prepared in Example 1 and Comparative Example 1 were compared.

TABLE 3

	The tensile strength		Elongation		Tear strength
	Vertical	horizontal	Vertical	horizontal	Vertical	horizontal
Example 1	220㎏ / ㎠	210㎏ / ㎠	550%	650%	280㎏ / ㎠	270㎏ / ㎠
Comparative Example 1	180㎏ / ㎠	175㎏ / ㎠	410%	580%	90㎏ / ㎠	85㎏ / ㎠

As a result of comparing the mechanical properties of the agricultural sheet produced by the method of Example 1 and the agricultural sheet produced by the method of Comparative Example 1, it can be seen that Example 1 is increased in strength than Comparative Example 1, and thus the durability is also superior. I could see that.

Experimental Example 2: Observation of Soil Changes in Agricultural Sheets

Three months after applying the agricultural sheet prepared in Example 1 and the agricultural sheet prepared in Comparative Example 2 to the rice paddy field, the agricultural sheet was walked and the soil change was observed.

As a result, the rice paddy field to which Example 1 was applied showed a weed-preventing effect, and the soil condition was good due to the good ventilation. Got out.

Claims (14)

1. (A) a raw material in powder or pellet form composed of polyethylene or polypropylene material; blowing agent; Injecting a primary mixture prepared by mixing calcium carbonate into the inlet of the first extruder;

   (B) a raw material in powder or pellet form composed of polyethylene or polypropylene material; Injecting a secondary mixture prepared by mixing calcium carbonate into an input unit of a second extruder;

   (C) a raw material in powder or pellet form composed of polyethylene or polypropylene material; Injecting a secondary mixture prepared by mixing calcium carbonate into an inlet of a third extruder;

   (D) The primary mixture discharged from the first extruder, the secondary mixture discharged from the second extruder, and the secondary mixture discharged from the third extruder are simultaneously blow-molded through one discharge port to form the primary mixture on the outer surface of the molding. Shaping the components so that the secondary mixture discharged from the second extruder and the third extruder is located in the middle side and the inner side, respectively; And

   (E) a method of manufacturing a mulching sheet, comprising: cutting a longitudinal section of the blow molding product and winding the cut blow molding products into a sheet form to respectively unfold the sheet.
2. The method of claim 1, wherein the polyethylene material is 20 to 80% by weight of Low Density Polyethylene (LDPE) and 20 to 80% by weight of Linear Low Density Polyethylene (LLDPE).
3. The method of claim 1, wherein the blowing agent is azodicarbonamide (Azodicarbonamide).
4. The method of claim 1, wherein the secondary mixture further comprises cellulose (Cellulose).
5. The method of claim 1, wherein the primary mixture further comprises an antioxidant.
6. The method of claim 1, wherein the secondary mixture further comprises an antioxidant.
7. (a) adding a polyethylene mixture mixed with an antioxidant to a pellet-type raw material made of polyethylene material into an input unit of a first extruder;

   (b) injecting a polyethylene mixture mixed by adding ethylene vinyl acetate to a pellet-type raw material made of polyethylene material into an input unit of a second extruder;

   (c) The polyethylene mixture discharged from the first extruder and the polyethylene mixture discharged from the second extruder are blow molded simultaneously through one discharge port so that the polyethylene mixture component discharged from the first extruder is located on the outer side of the molding, and Shaping so that the polyethylene mixture component exiting the second extruder is located on the side;

   (d) cutting the blow molding to cut the longitudinal section to spread the cut blow molding into a sheet; And

   (e) a method for producing an agricultural sheet, comprising the step of drilling a plurality of holes having a predetermined size in the sheet obtained above.
8. The method of claim 7, wherein the polyethylene material is LDPE (Low Density Polyethylene), HDPE (High Density Polyethylene), LLDPE (Linear Low Density Polyethylene) manufacturing method of the agricultural sheet, characterized in that.
9. 8. The method of claim 7, wherein the polyethylene mixture introduced into the inlet of the first extruder further comprises a color masterbatch.
10. 8. The method of claim 7, wherein the antioxidant is a phenolic antioxidant or thioester.
11. 8. The method of claim 7, wherein the polyethylene mixture introduced into the second extruder is further comprises a color masterbatch.
12. The method of claim 7, wherein the polyethylene mixture introduced into the second extruder is added 5-30% by weight (w / w) of calcium carbonate.
13. The method of claim 7, further comprising the step of stamping the concave-convex pattern on the outer surface of the sheet obtained in the step (d) and (e).
14. The method of manufacturing a sheet for agriculture, characterized in that the perforated hole in the obtained sheet has a diameter of 1 mm to 10 mm.