KR20150050821A - Apparatus and method for manufacturing agricultural cover sheet - Google Patents

Abstract

The present invention relates to an apparatus and a method for manufacturing agricultural rubber cover sheets, which can manufacture agricultural rubber cover sheets, can be repeatedly used for a long time by using waste tire, waste EDPM or the like, and can reduce manufacturing costs. The apparatus for manufacturing an agricultural cover sheet according to the present invention comprises: an extruder for extruding and molding a mixture containing waste rubber by mixing and dispersing the mixture; a calendaring unit in which an extruded mold extruded and molded by the extruder is gradually rolled into a thin rubber sheet by a plurality of calendaring rolls, whereas a pair of heating rolls are continuously configured; and a cooling roll equipped with a cooling roll cooling the rubber sheet rolled down from the calendaring unit. The extruder is a double shaft extruder including a shaft part consisting of a supply part, a mixing part, a reaction part, and a discharge part in sequence, and the calendaring rolls of the calendaring part are set to different temperatures respectively.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for manufacturing agricultural cover sheets,

The present invention relates to an apparatus and a manufacturing method for an agricultural cover rubber sheet used for cultivating whole crops such as radish, Chinese cabbage, pepper, eggplant and corn, and more particularly to a manufacturing apparatus and a manufacturing apparatus for an agricultural cover rubber sheet which can be used repeatedly for a long time by using waste rubber ≪ / RTI >

The agricultural vinyl that covers the mulching of the paddy fields prevents the erosion of the ground surface, prevents pests and weeds, prevents moisture evaporation, and allows crops to grow well. About 330,000 tons have been used.

Therefore, the agricultural vinyl used for farming should be thin, have a uniform width, length and weight, and have a uniform surface. Such conventional agricultural vinyls are made of soft polyethylene vinyl, vinyl acetate or vinyl chloride.

However, since conventional agricultural vinyls are easily torn due to their characteristics, they can not be reused and are used only once, and waste vinyl is generated as much as the amount of agricultural vinyl used for farming every year.

These waste vinyls are collected through the Korea Environment & Resources Corporation, etc. Due to the aging of the rural population and shortage of labor, the amount of petroleum pellets collected every year is only about 180,000 tons, and about 150,000 tons of petroleum pellets are collected around the farmland Neglected or buried, or illegally incinerated. As such, waste vinyl that has been left untreated or buried or illegally burned around the agricultural land causes serious environmental problems such as soil pollution and air pollution, which has a very bad influence on the growth of crops next year.

Also, in case of agricultural waste vinyl collected through the Korea Environmental Resources Corporation, most of the foreign substances such as soil, stones and weeds are discharged in a state containing more than 80%, so that recycling of waste vinyl is difficult, It takes a great deal of time to collect and process it.

Therefore, in order to solve this problem, it is considered that minimizing the generation of agricultural waste vinyl is considered as the most preferable method, and it is possible to reuse for more than 10 years with high tensile strength and elongation ratio as compared with the current agricultural vinyl, It is in urgent need of development of an agricultural cover sheet which can be produced.

As described above, a method of recycling a waste tire such as a waste tire or waste EDPM as a material for an agricultural cover sheet which can be produced at low cost without being easily torn even after long-term reuse can be considered.

On the other hand, the present inventors have found that a mixture composed of a waste rubber powder, an olefinic thermoplastic resin and a compatibilizing agent selected from a styrene compound is fed into an extruder in Korean Patent No. 711,838 (hereinafter referred to as "Patent Document 1" A thermoplastic elastomer using waste rubber formed by reacting and molding a rubber product molded therefrom has been disclosed.

However, in Patent Document 1, the thermoplastic elastomer (TPE) is pelletized and then put into a mold to produce a brake pedal, an automobile bumper, etc. by injection molding or compression molding. In this method, It has been difficult to produce a cover sheet for agricultural use which is suitable for the characteristics of the agricultural vinyl as described above, that is, the thickness thereof is thin, and the thickness, the length and the width are uniform.

Patent Document 1: Korean Patent No. 711,838

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide an agricultural cover rubber sheet which can be used repeatedly for a long period of time by using waste tires or waste rubber such as waste EDPM, And a method for manufacturing the same.

The present invention relates to an apparatus for producing an agricultural cover rubber sheet, which comprises an extruder for mixing and dispersing a mixture containing waste rubber and extrusion-molding the extrudate, and an extruder extruded by the extruder, And a cooling section composed of a cooling roll for cooling the rubber sheet rolled in the calendering section, wherein the extruder comprises a supply section, a mixing section And a shaft part constituting a reaction part and a discharge part in sequence, wherein a plurality of calendering rolls of the calendering part are set at different temperatures.

The apparatus for manufacturing an agricultural cover rubber sheet according to the present invention further comprises a sheet perforation for perforating a material hole for planting crops on the surface of the rubber sheet cooled by the cooling section.

In the present invention, it is preferable that the supply unit comprises a lead screw, and the mixing unit includes a forward screw and a kneading disk, and the reaction unit includes a reverse screw and a kneading disk, and the discharge unit includes a lead screw or a forward screw .

Further, in the present invention, the calendering section is constituted by four pairs of calendering rolls successively, and the four pairs of calendering rolls are sequentially heated at 135 DEG C, 140 DEG C, 135 DEG C, and 130 DEG C, respectively, The rubber sheet is rolled thinly in succession by the four pairs of continuous calendering rolls and is formed into a rubber sheet of 0.2 to 0.3 mm.

In the present invention, it is preferable that the cooling section is composed of one to four pairs of cooling rolls, and the cooling roll is plated with chromium.

The present invention also relates to a method for producing an agricultural cover rubber sheet, which comprises feeding a mixture of 65 to 75 wt% of waste rubber powder, 25 to 35 wt% of thermoplastic plastic and 0.1 to 6 wt% of wax into an extruder A second step of forming the extrudate into an extrudate of a thermoplastic vulcanizate by dynamic crosslinking by mixing and dispersing in the extruder; and a second step of extruding the extrudate in succession in a plurality of calender rolls And a fourth step of cooling the thin rubber sheet to 4 to 10 占 폚. In the fourth step, the rubber sheet is rolled into a thin rubber sheet having a thickness of 0.2 to 0.3 mm.

The method for manufacturing an agricultural cover rubber sheet according to the present invention may further comprise a fifth step of drilling a reed hole for cultivating the crop on the surface of the thin rubber sheet cooled in the fourth step.

In the second step, in the second step, the extruder is a biaxial extruder including a shaft portion in which a forward screw, a kneading disk and a reverse screw are sequentially formed, and the mixture is pumped forward by the forward screw, The kneading disk is mixed and dispersed and the flow of the mixture is reversed by the reverse screw so that the residence time of the mixture in the extruder is prolonged.

In the present invention, the thermoplastic plastic is at least one selected from low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), and polyolefin elastomer (POE).

INDUSTRIAL APPLICABILITY According to the apparatus and method for producing an agricultural cover rubber sheet of the present invention, it is possible to reduce the manufacturing cost by using waste rubber such as waste tire or waste EDPM, and to reuse it for a long period of 10 years or more with high tensile strength and elongation, It is possible to provide an agricultural covering rubber sheet which can solve the environmental cost and the cost of treatment by agricultural waste vinyl.

In addition, since the agricultural cover rubber sheet produced by the present invention has perforated holes for planting crops based on the standard farming technique of Rural Development Administration in advance during the manufacturing process, it is possible to secure a standardized planting distance, It is possible to reduce the number of workings of phosphorus and also to solve the problem that the perforated portion of conventional agricultural vinyl is torn and weeds are generated in the portion.

1 is a schematic cross-sectional view of an apparatus for producing an agricultural cover rubber sheet according to an embodiment of the present invention
2 is a schematic sectional view for explaining an extruder according to an embodiment of the present invention
3 is a flowchart for explaining a method of manufacturing an agricultural cover rubber sheet according to an embodiment of the present invention.
4 is a schematic view for explaining dynamic crosslinking in an extruder;
5 is a view for explaining an application example of the agricultural cover rubber sheet manufactured by the embodiment of the present invention
6 is a photograph of an agricultural cover rubber sheet piece manufactured by an embodiment of the present invention
Fig. 7 (a) is a photograph of a conventional agricultural vinyl perforated with a cropping material hole, Fig. 7 (b) is a photograph of a cropping material hole perforated on the agricultural cover rubber sheet produced by the embodiment of the present invention
8 is a schematic perspective view of a winding device for storing an agricultural cover rubber sheet produced by the present invention

Specific embodiments of the present invention will be described in detail below with reference to Figs. 1 to 5. Fig.

Fig. 1 is a schematic cross-sectional view of an apparatus for producing an agricultural cover rubber sheet according to an embodiment of the present invention, Fig. 2 is a schematic sectional view for explaining an extruder according to an embodiment of the present invention, Fig. 4 is a schematic view for explaining the dynamic crosslinking in the extruder, Fig. 5 is a schematic view for explaining the method of applying the agricultural cover rubber sheet manufactured by the embodiment of the present invention FIG. 6 is a photograph of a piece of agricultural cover rubber sheet manufactured by the embodiment of the present invention, FIG. 7 (a) is a photograph of a conventional agricultural vinyl perforated with a crop material planting hole, FIG. (b) is a photograph of the agricultural cover rubber sheet prepared according to the embodiment of the present invention, and Fig. 8 is a photograph of the agricultural cover rubber sheet produced by the present invention A schematic perspective view of a take-up device.

First, as shown in Fig. 1, an apparatus for producing an agricultural cover rubber sheet comprises an extruder 10, a calendering section 20, a cooling section 30, a sheet perforation 60, (50).

1 and 2, the extruder 10 includes a hopper 11 into which a mixture (raw material) is charged, a supply portion 12 that supplies a mixture introduced by the hopper 11, A reaction part 14 for pumping the supplied mixture in a forward direction to mix and disperse the mixture, a reaction part 14 for maximizing reaction and kneading by increasing the retention of the mixture by reversing the flow of the mixed and dispersed mixture, And a head (16) for extruding and discharging the conveyed mixture in a plate shape. The feeding part (12), the mixing part (13) and the mixer part (13) And the reaction part 14 and the discharge part 15 are sequentially formed on the shaft part A in the extruder 10.

The supply part 12 is a lead screw and supplies the mixture injected by the hopper 11 to the mixing part 13 in a predetermined amount.

The mixing unit 13 includes a forward screw 13a and a kneading disc 13b and the forward screw 13a pumps the mixture supplied from the supply unit 12 in the positive direction , And the kneading disc 13b mixes and disperses the mixture.

The reaction part 14 includes a backward screw 14a and a kneading disk 14b which reverses the flow of the mixture and allows the mixture to stay for a sufficient time . That is, the mixture passing through the kneading disc 13b of the mixing section 13 is returned to the kneading disc 13b of the mixing section 13 to sufficiently mix and disperse the mixture, The mixing and dispersing in the kneading disk 14b of the reaction part 14 maximizes the reaction and kneading.

The discharge unit 15 includes a lead screw or a forward screw 13a and pushes the reaction mixture to maximize reaction and kneading in the reaction unit 14 toward the head 16 do.

The head 16 is formed with a plate-shaped opening outside the extruder 10, and extrudes and discharges the mixture transferred from the discharge portion 15 into a plate shape.

The extruder 10 is a twin-screw extruder having two axes arranged side by side. The twin-screw extruder 10 is a single-screw extruder which can be pumped in one direction by only one screw provided with only a forward screw. On the other hand, It is preferable from the viewpoint that the residence time of the mixture is sufficient and the reaction can be sufficiently carried out by kneading and dispersing.

The shaped product extruded into the extruder 10 is rolled into a thin rubber sheet through a calendering process by the calendering section 20 which is carried out by a first calendering roll 21, a second calendering roll 22, a third calendering roll 23 and a fourth calendering roll 24.

Each of the calendering rolls 21, 22, 23 and 24 is formed by a pair of heating rolls heated to a constant temperature by a preheating device (not shown), and a certain gap Respectively. For example, in the present embodiment, the first calendering roll 21 is heated to 135 ° C, and the thickness of the rubber sheet between the heating roll and the heating roll is set to be 3 mm, The ring roll 22 is heated to 140 DEG C and the thickness of the rubber sheet between the heating roll and the heating roll is set to be 2 mm and the third calendering roll 23 is heated to 135 DEG C, The thickness of the rubber sheet between the heating roll and the heating roll is set to be 1 mm, the fourth calendering roll 24 is heated to 130 ° C, 0.3 mm. By changing the temperature in this way, it is possible to prevent the rubber sheet from being unevenly deformed during the calendering process by the calendering rolls 21, 22, 23, 24.

By such a configuration of the calendering section 20, a thin rubber sheet having a thickness of about 0.2 to 0.3 mm can be manufactured by successively thinning the molded product extruded in a plate form in the compressor 10.

Further, in the embodiment of the present invention, the calendering process is performed by successively thinning the extruded molded products. In response to this, the calendering rolls 21, 22, 23, 24 It is necessary to control the rotation speed. For example, in the embodiment of the present invention, the speed of each of the calendering rolls 21, 22, 23, 24 is controlled so that a rubber sheet of 8 m per minute can be produced.

Further, in order to polish a thin rubber sheet having a thickness of about 0.2 to 0.3 mm after the calendering process by the calendering unit 20 to have a homogeneous smooth surface, the calendering rolls 21, 22, 23, and 24, a hard roll such as a metal rather than a soft roll is preferable.

Further, as described above, the thin rubber sheet after the calendering process by the calendering section 20 is cooled in the cooling section 30 and hardened.

The cooling unit 30 is composed of one to four pairs of cooling rolls set at about 4 to 10 ° C. Therefore, the thin rubber sheet heated to a high temperature by the calendering process by the calendering unit 20 is cooled and cured by passing through the cooling rolls of the cooling unit 30.

Further, in order to smooth the surface of the rubber sheet, it is preferable to use a roll coated with chromium on the surface of the cooling roll.

The sheet perforation 60 perforates the cropping material holes at regular intervals based on the planting distance by the standard tillage technique of RDA, on the surface of the thin rubber sheet that has been cured and cooled by the cooling unit 30. However, the sheet perforation 60 may be configured to be detachable so as to be operable only when a hole is required in the surface of the rubber sheet, or to control only the operation of the sheet perforation 60 in the attached state .

The sheet winding portion 50 is a means for winding the rubber sheet passed through the cooling portion 30 or the sheet perforation 60 so as to facilitate storage or transportation and is particularly suitable for winding the rubber sheet It is not limited.

The cooling unit 30, the sheet perforations 60, and the sheet perforations 60 are formed so that the thin rubber sheet passing through the cooling unit 30 can be perforated or wound while being pulled without being sagged, 60, and the sheet take-up portion 50, a sheet guide portion 40 formed of a guide roll is preferably provided.

Next, with reference to Figs. 3 to 8, a method of manufacturing an agricultural cover rubber sheet using the agricultural cover rubber sheet producing apparatus will be described in detail.

(1) feeding the raw material to the hopper of the extruder (S10)

First, a mixture of 65 to 75% by weight of waste rubber powder as a main raw material, 25 to 35% by weight of a thermoplastic plastic and 0.1 to 6% by weight of wax is fed through the hopper 11 of the extruder 10 Into the extruder (10).

The waste rubber powder is powder of waste rubber which has been vulcanized and produced by adding carbon black to a rubber raw material. Used waste tire rubber powder or waste EPDM powder (weather strip rubber powder) coming from an automobile weather strip is used as a powder of waste rubber, The size of the waste rubber powder is preferably finely pulverized to a size of 10 mu m to 300 mu m. When the waste rubber powder is too small, the rubber elasticity is low. When the waste rubber powder is too large, the reactivity with the thermoplastic resin is low.

On the other hand, waste rubbers such as waste tires or waste EDPM used as the main raw materials in the present invention have properties of thermosetting because they are produced by vulcanization after adding carbon black as an intensifying material to natural rubber, It is impossible to use the waste rubber of the other rubber product as it is to be molded again. Therefore, as described later, a mixture obtained by mixing thermoplastic plastic and wax in the waste rubber powder as the main raw material is thermoplastic vulcanization (hereinafter referred to as "thermoplastic vulcanization ") through dynamic vulcanization in the extruder 10, TPV ").

The thermoplastic plastic material may be a polyolefin based material such as low density polyethylene (hereinafter referred to as "LDPE"), high density polyethylene (hereinafter referred to as "HDPE"), linear low density polyethylene density polyethylene (hereinafter referred to as "LLDPE") or a polyolefin elastomer (hereinafter referred to as "POE").

In addition, the wax is intended to reduce the friction coefficient during rubber processing, and it is possible to prevent a decrease in productivity due to an increase in friction coefficient (increase in frictional force) due to rubber during processing, and also to enable thinner sheet production . However, when the proportion of the wax is more than 6% by weight, the physical properties of the rubber are decreased. Therefore, the content of the wax is preferably 6% by weight or less.

(2) extrusion molding in an extruder (S20)

The mixture of the waste rubber powder, the thermoplastic plastic and the wax injected into the hopper 11 of the extruder is supplied to the hopper 11 of the extruder by the lead screw of the supply part 12 in a predetermined amount, And is supplied to the mixing portion 13.

The mixture supplied to the mixer 13 is pumped in the positive direction by the forward screw 13a of the mixer 13 and the mixture is mixed and dispersed by the kneading disk 13b. Also, the flow of the mixture is reversed by the reverse screw 14a of the reaction part 14, and the dynamic cross-linking is performed in a state where the mixture stays for a sufficient time.

As shown in FIG. 4, in the process of mixing the waste rubber powder and the thermoplastic plastic material in the extruder 10, cross-linking takes place in a process of receiving shear stress in the horizontal direction between the materials , The crosslinked rubber particles are finely dispersed in a continuous phase of the thermoplastic plastic to be mixed with one material TPV. At this time, the crosslinked rubber particles of the dispersed phase give rubber elasticity, and the continuous thermoplastic plastic resin causes melt processing and recycling Lt; / RTI >

At this time, the temperature in the extruder 10 is 130 to 180 ° C. and the temperature gradually increases toward the head 16 from the hopper 11. This is because the raw material to be fed into the hopper 11 is heated by the high temperature The initial temperature is set to be as low as about 130 DEG C so as not to adhere to the lead screw or the like and the temperature rises by the frictional heat in the course of mixing and dispersing in the extruder 10. The temperature at the head 16 side is 180 DEG C In order not to exceed. The rotation speed of the extruder is set to about 150 rpm.

The TPV produced by the dynamic crosslinking in the extruder 10 is pushed toward the head 16 by the lead screw or the forward screw 13a of the discharge portion 15, At this time, the extruded extrudate is extruded into an open shape, i.e., a plate shape, of the head 16.

(3) Calendering process step (S30)

The molded product extruded into the extruder 10 is rolled into a thin rubber sheet through a calendering process by the calendering section 20, and a plurality of continuously formed calendering rolls are passed, And is formed into a sheet.

For example, in a first calendering roll, a rubber sheet of 3 mm is formed by a pair of heating rolls heated to 135 ° C, and in a second calendering roll, a pair of heating rolls heated to 140 ° C With a thinner rubber sheet, in a third calendering roll, by a pair of heating rolls heated to 135 占 폚 and to a thinner rubber sheet of 1 mm in the fourth calendering roll, by a pair of heating rolls heated to 130 占 폚 in a fourth calendering roll It is molded into a thinner rubber sheet of 0.2 to 0.3 mm and is molded into a thin agricultural cover rubber sheet of 0.2 to 0.3 mm which can replace conventional agricultural vinyl.

By changing the temperature in this manner, it is possible to prevent the rubber sheet from being unevenly deformed during the calendering process.

(4) Cooling process step (S40)

The rubber sheet heated to a high temperature while being subjected to the calendering process step is cooled and cured by passing through the cooling unit 30 with a plurality of cooling rolls. At this time, the temperature of the cooling roll is set to about 4 to 10 ° C desirable.

(5) Drilling hole drilling step of rubber sheet (S50)

The thin rubber sheet, which is cooled and hardened by the cooling unit 30, is perforated to recycle the crops at regular intervals in the sheet perforations 60, as shown in Fig. 7 (b). At this time, it is preferable that the interval between the above-mentioned reed holes is determined based on the standard farming technique of the Rural Development Administration.

As shown in Fig. 7 (a), since the conventional agricultural vinyl is easily torn due to its characteristics, it is not possible to punch holes in which crops can be re-planted in advance, and when the perforated re- There is a problem that the weeds grow at the torn portion. However, in the case of the rubber sheet produced by the present invention, since the tensile strength and the elongation ratio are large, it is possible to reuse for a long period of time and also to drill holes for re- Therefore, it is possible to relieve the farmer's hand in preparation for the farming, and to prevent the punctured rehabilitation hole from being torn during use.

(6) Rubber sheet winding step (S60)

The thin rubber sheet that has been cooled and hardened by the cooling unit 30 or a rubber sheet in which a hole is drilled in order to plant the crop on the surface of the rubber sheet is provided with a sheet guide portion 40 made of a guide roll, And is wound around the sheet winding portion 50.

As described above, the agricultural cover rubber sheet manufactured according to the present invention is intended to cover and mulch the gutters of the field, as shown in Fig. 5, and has a thickness of 0.2 to 0.3 mm, Of 80 to 150 cm and a length of 10 to 50 m. This takes into account the conditions for covering the actual pavement, conditions for long-term re-use, and transportation or storage, and the standard can be adjusted accordingly. However, when the thickness is less than 0.2 mm, it tears easily, and when the thickness is 0.3 mm or more, the weight is greatly increased, which is inconvenient for storage and management for reuse. Further, when the length is less than 10 m or more than 50 m, there is a problem that it is inconvenient to roll and to store.

6 is a view showing an agricultural lid rubber sheet prepared according to an embodiment of the present invention. The tensile strength and the elongation percentage of the rubber sheet tested are shown in Table 1 below.

Tensile Strength (MPa) Elongation (%) Waste tires + POE 5.0 330 Lung EPDM + POE 4.25 427 Lung EPDM + LDPE 3.87 244

As can be seen from Table 1, the agricultural cover rubber sheet produced by dynamic crosslinking by mixing POE or LDPE with waste tires or waste EPDM is excellent in tensile strength and elongation, and unlike conventional agricultural vinyls, It is possible to reduce the amount of waste vinyl generated each year by replacing the conventional agricultural vinyl, and therefore, it is possible to solve the environmental pollution such as waste disposal cost and pollution pollution, which has been pointed out as a chronic problem in the meantime .

Further, in order to reuse the agricultural cover rubber sheet manufactured according to the embodiment of the present invention every year, after the use, it can be conveniently stored by using a winding device as shown in Fig.

10 Extruder 11 Hopper
12 Supply part 13 Mixing part
13a forward screw 13b knitting disk
14 Reaction part 14a Reverse screw
14b kneading disk 15 discharge portion
16 head 20 calendering part
21 first calendering roll 22 second calendering roll
23 third calendering roll 24 fourth calendering roll
30 Cooling section (cooling roll) 40 Sheet guide section
50 sheet winding part 60 sheet sheet

Claims (9)

An extruder for mixing and dispersing a mixture containing waste rubber and extrusion molding,
A calendering section which rolls the extrudate extruded by the extruder into a gradually thin rubber sheet by calendering by a plurality of calendering rolls constituted by a pair of heating rolls,
And a cooling unit comprising a cooling roll for cooling the rubber sheet rolled in the calendering unit,
Wherein the extruder is a biaxial extruder including a supply portion, a mixing portion, and a shaft portion sequentially constituting a reaction portion and a discharge portion,
Wherein the plurality of calendering rolls of the calendering unit are set at different temperatures. The method according to claim 1,
Further comprising a sheet perforation for perforating a hole for planting crops on the surface of the rubber sheet cooled by the cooling unit. 3. The method according to claim 1 or 2,
Characterized in that the supply part comprises a lead screw and the mixing part comprises a forward screw and a kneading disk, the reaction part includes a reverse screw and a kneading disk, and the discharge part is a lead screw or a forward screw. A device for manufacturing a sheet. 3. The method according to claim 1 or 2,
Wherein the calendering section is constituted by four pairs of calendering rolls successively, and the four pairs of calendering rolls are successively heated to 135 占 폚, 140 占 폚, 135 占 폚 and 130 占 폚,
Wherein the rubber sheet is rolled thinly in succession by the four pairs of continuous calendering rolls and is formed into a rubber sheet of 0.2 to 0.3 mm. 3. The method according to claim 1 or 2,
Wherein the cooling unit is composed of one to four pairs of cooling rolls, and the cooling roll is plated with chromium. A first step of supplying a mixture of 65 to 75% by weight of waste rubber powder, 25 to 35% by weight of thermoplastic plastic and 0.1 to 6% by weight of wax into an extruder,
A second step of molding the mixture into an extrudate of thermoplastic vulcanizate by dynamic crosslinking by mixing and dispersing in the extruder,
A third step of sequentially rolling the extrudate in a plurality of continuously arranged calendering rolls and molding the extrudate into a thin rubber sheet of 0.2 to 0.3 mm,
And a fourth step of cooling the thin rubber sheet to 4 to 10 占 폚. The method according to claim 6,
Further comprising a fifth step of punching a hole in the thin rubber sheet that has been cooled in the fourth step, in order to reapply the crop to the surface of the thin rubber sheet. 8. The method according to claim 6 or 7,
In the second step, the extruder is a twin-screw extruder including a shaft portion in which a forward screw, a kneading disk and a reverse screw are sequentially formed,
The mixture is pumped in the forward direction by the forward screw and mixed and dispersed by the kneading disk and the flow of the mixture is reversed by the reverse screw so that the retention time of the mixture in the extruder is extended Characterized in that the method comprises the steps of: 8. The method according to claim 6 or 7,
Wherein the thermoplastic plastic is at least one selected from low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) or polyolefin elastomer (POE).

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