KR100945782B1 - Environmental floor sheet for salt field and method thereof - Google Patents

Abstract

PURPOSE: An environmental floor sheet for a salt field is provided to use environmental-friendly materials instead of PVCs, to control a heat tension from a first non-woven fabric, and to enhance a connection between heterogeneous materials. CONSTITUTION: An environmental floor sheet for a salt field comprises: an upper layer unit(10) formed with PP or PE; a first non-woven fabric(30) formed with PET material to laminate on the lower side of the upper layer unit; a melting media(50) inserted among the upper layer unit, the first non-woven fabric, and a lower layer unit by a heat-welding process; the lower layer unit(20) formed with a mixture of EVA including 10~20 wt% of VA and calcium carbonate with a specific gravity of 2.5~2.7, and 30~50 wt% as a comparison to the entire weight; and a second non-woven fabric(40) formed with PET with a thickness of 1.2~1.5 times thicker than the first non-woven fabric.

Description

Environmentally friendly salt plate and its manufacturing method {ENVIRONMENTAL FLOOR SHEET FOR SALT FIELD AND METHOD THEREOF}

The present invention relates to an environmentally friendly salt plate and a method of manufacturing the same, and more particularly, to use an environmentally friendly material without the use of PVC which is likely to generate harmful substances during incineration or dyeing, but overcomes the problem of bonding between heterogeneous materials. In addition, the present invention relates to a salt flat sheet and a method of manufacturing the same, which can provide good adhesion to the salt flat ground and ensure sufficient flexibility.

The salt field is a flooring installed on the salt crystal ground and some evaporation grounds in order to prevent the mixing of foreign substances such as soil in the salt to evaporate the sea water to make the natural salt. It produces sun salt on the tiles.

PVC sheet is polluted by natural salt due to plasticizer contained in PVC sheet and environmental pollution such as pollutants on land and sea.

For this reason, governments and salt producers are preparing to replace PVC plates and replace them with environmentally friendly salt plates.

To prevent the introduction of foreign substances such as contaminants and contaminated water from the bottom of the saltfield and the side of the saltfield, spread the floorboard on the front of the saltfield and bury 20-30cm below the 10-20cm end of the 4 sides of the saltfield. Fix it. For such construction, the salt plate needs a high degree of flexibility.

Until now, PVC floorboards could be manufactured with flexible floorboards by using a large amount of plasticizers, and materials needed for each lamination could be manufactured with some adjustment of the plasticizers. However, the problem was that these plasticizers contaminated the environment.

The salt plate needs soft physical properties as a whole, but the upper layer of the salt plate has a high wear resistance due to the tear angle and wear of the upper layer of the salt plate due to the salt angle of 2.5 hardness of the cube.

Furthermore, it does not use plasticizers, which is environmentally friendly and does not easily cause thermal expansion even at high temperatures, and even if the detailed composition is composed of heterogeneous materials that form a soft sheet, it can not only firmly adhere to them but also strengthens the adhesion of the floor to the surface of the salted surface. There is a need for the development of new and advanced salt plates that can effectively prevent uplifting problems.

The present invention has been made in order to overcome the problems of the above technology, to provide a salt plate having a material that does not emit harmful substances when incinerated or salted, the salt plate is divided into upper and lower layers to give a unique physical properties and dyeing In order to prevent thermal expansion even at the high surface temperature generated during use, and to enhance the bonding force between dissimilar materials, a first nonwoven fabric is used, and a second nonwoven fabric is attached to the lower portion of the salt crystal plate to form a lower portion of the lower layer together with the first nonwoven fabric. The main object of the present invention is to provide a salt-filled floor board which can secure the thermal expansion prevention function while giving a vertical balance, and have a flexible property by calcium carbonate.

Another object of the present invention is to inject a molten medium between the upper portion and the first nonwoven in order to ensure good adhesion between the upper portion and the first nonwoven.

Still another object of the present invention is to provide a load on the lower layer of the torsion plate so that the torsion plate has a stable center of gravity at the lower side to enhance adhesion to the ground.

A further object of the present invention is to ensure the surface stability of the lower side during the hot air process by further stacking the base portion in the bottom portion of the salt toner plate manufactured by the hot air process.

In order to achieve the above object, the environmentally friendly salt plate according to the present invention, the upper layer portion made of any one of PP, PE; A first nonwoven fabric laminated on a lower portion of the upper layer and made of a PET material; A molten medium that is injected between the upper layer part and the first nonwoven fabric and is melted by a heat fusion process to penetrate the upper layer part, the first nonwoven fabric, and the lower layer part; It is laminated on the lower portion of the first nonwoven fabric, and the total specific gravity is 1.2 by mixing 10 to 20% by weight of EVA, and calcium carbonate having a specific gravity of 2.5 to 2.7 and 30 to 50% by weight relative to the weight of the entire lower layer portion A lower layer formed to be 1.4; The second non-woven fabric is laminated on the lower layer portion and made of PET and having a thickness of 1.2 to 1.5 times of the first nonwoven fabric.

In addition, the base portion is further laminated on the lower side of the non-woven fabric, the base portion composed of calcium carbonate having 40 to 60% by weight based on the total base portion weight in the state of specific gravity of any one of LDPE and HDPE 2.5 to 2.7 It characterized by including.

As a method for producing an environmentally friendly salt slate, VA has a specific gravity of 1.2 to 1.4 by mixing EVA having 10 to 20% by weight of EVA and calcium carbonate having 30 to 50% by weight and specific gravity of 2.5 to 2.7 based on the entire lower layer. A first step of preparing the material of the lower layer to be; A second step of preparing a lower layer part in a molten plate-shaped body in a compounding extruder by blending the carbon black master batch of 3 to 5% by weight based on the total weight of the lower layer part; A third step of bonding the first nonwoven fabric made of PET to an upper surface of the lower layer part; A fourth step of bonding the second nonwoven fabric having a thickness of 1.2 to 1.5 times of the first nonwoven fabric while being made of PET on the lower surface of the lower layer portion; A fifth step of depositing a film-forming melt medium on the first nonwoven fabric upper surface; A sixth step of laminating an upper layer formed of any one of PE and PP on the melted medium, and then melting the melted medium and the first nonwoven fabric by a heat fusion process to bond the upper layer and the lower layer to each other. It is done.

According to the environmentally friendly salt jangpan according to the present invention and a method for manufacturing the same

1) Eco-friendly materials can be used instead of PVC to create an eco-friendly atmosphere, while pursuing thermal expansion by the first nonwoven fabric and strengthening bonding strength between dissimilar materials.

2) It is possible to secure the overall flexibility of the floor plate by the lower layer including calcium carbonate and to reinforce the adhesion of the ground.

3) The thermal resistance of the lower layer portion having the relatively thermal expansion property by the second nonwoven fabric is strengthened while maintaining a balance with the first nonwoven fabric,

4) At the same time, the base portion can be additionally laminated so that the lower side does not cry or wrinkle when producing hot air,

5) It has an effect of shaping and processing the structure of the upper layer portion so that it is easy to stack a plurality of salt fields in a stepwise manner.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are not drawn to scale, and like reference numerals in each of the drawings refer to like elements.

1 is a cross-sectional view showing a schematic lamination configuration of a first embodiment of an environmentally friendly salt field board according to the present invention.

In the salt toner plate according to the first embodiment of the present invention, the nonwoven fabric is laminated on the lower portion of the lower layer portion 20, including the upper layer portion 10 and the lower layer portion 20, in the state of being divided into the upper layer portion 10 and the lower layer portion 20. It is characterized by having a constitution.

The upper layer 10 is a portion where the salt is settled at the same time the straw used in the dyeing operation is in contact with and directly exposed to solar heat.

In general, the upper layer 10 has a small coefficient of shrinkage and expansion at surface temperatures close to 50 to 60 ° C. in the production of sun salt, and also has a coefficient of thermal expansion and friction in order to have a tear prevention function while minimizing abrasion in rolling work, etc. It is desirable to adopt a material that is as small as possible and light in weight, and the upper layer 10 is made of any one material of PP and HDPE (High Density PolyEthylene) in order to satisfy the above requirements and has a specific gravity of 0.9 to 0.96. do.

Unlike the PVC, the material of the upper layer 10 is not only an environmentally friendly material that does not emit harmful substances even when incinerated, but also has a hard property of being torn and less wearable by the corner angle of salt having a hardness of 2.5. It can provide the property.

However, the upper layer portion 10 made of a material such as PE, PP is a thermal expansion may occur above the expected level at a temperature of 50 to 60 ℃ obtained during the natural salt phase production process of PE, PP, this problem is the upper layer Due to the low thermal expansion properties of the other components in close contact with the (10) to prevent expansion / contraction to occur, for this purpose thermal expansion occurs by a close coupling with the first nonwoven fabric 30 and the lower layer 20 to be described later To prevent it.

The thickness of the upper layer portion 10 is 0.15 to 0.25 mm or occupies approximately 10 to 20% of the total thickness of the salt plate, so that the upper side of the salt plate is lighter and slimmer than the lower side. To improve the adhesion of the salt ground to the load by the side to the side, and additionally to the top surface of the upper layer portion 10 to the matte treatment to reduce the frictional resistance during dyeing by roller light to facilitate easier and easier dyeing process do.

The lower layer part 20 is stacked on the lower side of the upper layer part 10 to occupy most of the weight and thickness (about 70% of the thickness) of the salt plate, and serves as a load-centering or center of gravity of the entire salt plate. In addition to reinforcing the phenomenon that can be properly adhered to the salted ground, and to have a relatively high specific gravity, the soft and flexible properties to reduce the repulsive feeling or friction when dyeing, ultimately to ensure the ease of salting process Adopt a mixed composition of EVA and LDPE (or either EVA and LDPE) and calcium carbonate.

EVA (Ethylene Vinyl Acetate) is a copolymer of ethylene and vinyl acetate, and when the VA content is 10 to 20% by weight, it has properties similar to those of PE, particularly LDPE. VA weights are used having from 10 to 20% by weight on an EVA basis.

Calcium carbonate not only provides load to the lower layer to provide excellent adhesion to the salted ground, but also has a soft property to play a role in pursuing the ease of salting process.

In the lower layer portion 20, LDPE has a specific gravity of about 0.9, and at the same time, calcium carbonate is used in an amount of 20 to 30% by weight based on the total weight of the lower layer portion 20 and a specific gravity of 2.5 to 2.7. By configuring the specific gravity to be about 1.2 to 1.4 to have a specific gravity that is relatively heavier than the upper layer 10 to ensure that the entire salt flat plate is centered below the center of gravity to maintain a stable close contact on the salt ground.

The first nonwoven fabric 30 laminated between the upper layer portion 10 and the lower layer portion 20 ensures a stable bonding state between the upper layer portion 10 and the lower layer portion 20 and is made of PET having relatively low thermal expansion properties, and thus the upper layer portion It provides a function to compensate for the insufficient stretch resistance properties of the (10) and the lower layer portion 20, for example, when the upper layer portion 10 and the lower layer portion 20 is the same material series daringly without using a non-woven fabric Although it can be easily bonded to both by using the upper layer 10 is PE and the lower layer 20 is made of a different material, even if using a common adhesive can not be properly bonded to both provide sufficient bonding force between the two Since it is impossible to do so, the present invention not only ensures the coupling force between the upper layer portion 10 and the lower layer portion 20, but also minimizes the phenomenon of stretching of the upper layer portion 10 and the lower layer portion 20. In order to use the first nonwoven fabric 30 is basically.

The first nonwoven fabric 30 may be differentially treated in weight and specific gravity according to the thickness and specific gravity of the upper layer portion 10 and the lower layer portion 20 and made of a long fiber material so that the coefficient of thermal expansion is lower.

The first nonwoven fabric 30 is also infiltrated with the penetrating structure of the molten medium 50 to be described later into the upper layer 10 and the lower layer 20 even when the upper layer 10 and the lower layer 20 are bonded by the heat fusion process. It is possible to prevent the phenomenon of stretching easily in the upper layer even at high salt plate surface temperature because of the low thermal expansion coefficient inherent in PET.

In addition, the first nonwoven fabric 30 accommodates the melting medium 50 structure by the melting medium 50 to be described later, and the first nonwoven fabric itself is also infiltrated into the upper layer 10 and the lower layer 20 made of mutually different materials. Ensure close coupling between the two.

As described above, the first nonwoven fabric 30 may vary in specific thickness and specific gravity depending on the specific gravity and thickness of the upper layer portion 10 and the lower layer portion 20, but the salt non-woven board having a minimum thickness of 0.2 to 0.3 mm thickness. This can be made thicker than necessary to avoid the problem of losing flexibility.

The first nonwoven fabric 30 is based on the state of being laminated on the upper surface of the lower layer portion 20, and the molten medium 50 is introduced onto the surface of the first nonwoven fabric 30, and then the nonwoven fabric and the upper layer portion are subjected to a thermal compression process. (10) is combined.

The melting medium 50 is formed in a thin film form having a property that can be melted by a molten plastic or a heat fusion process, and is injected / coated onto the surface of the combination of the first nonwoven fabric 30 and the lower layer 20. This is to transfer heat to the contact portion of the upper layer portion 10 to be stacked to play a role of ensuring a close coupling relationship between the upper layer portion 10 and the lower layer portion 20.

Even if the temperature of the melting medium 50 reaches 230 to 250 ° C., which is slightly lower than the melting temperature of 265 ° C. of PET, the material of the first nonwoven fabric 30, the material does not deteriorate and at the same time, a material having a low viscosity is selected to select the upper layer part. 10 and the lower layer 20 and the density of the first nonwoven fabric 30 and the molten medium 50 at the time of the heat fusion bonding is lowered as much as possible, and then squeezed with a roll of 700 to 800kg / m ² melted in the first nonwoven fabric 30 The penetration of the medium 50 is facilitated.

In other words, the degree of penetration of the molten medium into the first nonwoven fabric can be controlled by adjusting the temperature of the melting medium and the pressure of the roll.

In other words, the first nonwoven fabric in which the upper layer portion 10, the first nonwoven fabric 30, and the lower layer portion 20 are in close contact with each other by heat additionally provided in the high temperature and thermal compression process of the melting medium 50 ( 30) The upper layer 10 and the lower layer 20 are also infiltrated and melted at the same time, so that the upper layer 10, the first nonwoven fabric 30, and the lower layer 20 can be integrally melt-bonded to each other. Through the process, the close coupling process between the upper layer 10 and the lower layer 20 is completed.

Due to this configuration and bonding principle, curls occur in the lower layer portion 20 formed of a relatively low crystallinity EVA and calcium carbonate combination toward the upper layer portion 10 made of a material having a relatively high crystallinity. The tissue of the lower layer 20 is allowed to penetrate naturally into the upper layer 10 together with the first nonwoven fabric 30 and the melting medium 50 to ensure the tightness and completeness of the bond, and the upper layer 10 and the lower layer 20 By reinforcing the portion lacking resistance due to thermal expansion to suppress the expansion and contraction of the upper layer portion 20.

The second nonwoven fabric 40 is laminated on the lower surface of the lower layer part 20. The second nonwoven fabric 40 is made of a PET material similar to the first nonwoven fabric 30 to have a thickness of 1.2 to 1.5 times greater than that of the first nonwoven fabric to enhance adhesion to the ground.

Specifically, the second nonwoven fabric 40 has a thermal expansion coefficient lower than that of the lower layer 20 so that thermal expansion occurs relatively well, and at the same time, the majority of the salt plate is formed to thermally expand the lower layer 20 to control the overall properties. It imparts resistance to provide thermal stability throughout the salt flat plate and at the same time serves to ensure the bonding force with other salt flat plate.

The second nonwoven fabric 40 is made of PET and has a coefficient of thermal expansion relatively lower than that of the lower layer 20 so that the molten tissue in the thermal fusion process penetrates into the lower layer 20 at the time of bonding with the other salt field plate to bond the salt between the salt field plates. It also has the ability to reinforce.

In summary, the first nonwoven fabric 30 ensures a bonding force between the upper layer portion 10 and the lower layer portion 20 through a melting medium and reinforces the stretch resistance of the upper layer portion 10. 2, the nonwoven fabric 40 is to provide a function of not only minimizing the thermal expansion property of the lower layer portion 20 due to the friction force peculiar to the nonwoven fabric and the relatively low thermal expansion property, but also assuring a coupling relationship with the adjacent salt toner plate to be positioned below. By the first and second nonwoven fabrics 30 and 40 positioned at the upper and lower portions of the lower layer portion 20, the lower layer portion 20 has thermal expansion resistance at each of the upper and lower portions thereof, thereby ensuring uniformity against thermal expansion resistance and stretching well even at high temperatures. It is to give a characteristic that does not.

  In other words, due to the inherent multi-density structure of the nonwoven fabric, it is possible to perform a filtration function to filter out fine particles. Both the upper layer portion 10 and the lower layer portion 20 are formed by the infiltration structure of the molten medium due to the filtration absorption characteristics of the nonwoven fabric. It is to promote a smooth coupling relationship between the two.

FIG. 2 is a cross-sectional view showing a schematic lamination configuration of a second embodiment of an environmentally friendly salt field to the present invention.

The second embodiment according to the present invention is able to provide more efficient characteristics when manufactured by hot air bonding. Compared with the above-described first embodiment, the second embodiment includes all of the configurations of the second nonwoven fabric 40. It may be said that the base portion 60 is further provided at the bottom of the).

Base portion 60 is composed of a combination of LDPE (or HDPE) and calcium carbonate, wherein the calcium carbonate is 40 to 60% by weight based on the total weight of the base portion 60 in the state of specific gravity 2.5 to 2.7 Characterized in that configured.

Here, the base portion 60 is similar to the configuration of the lower layer portion 20, but the difference is that the weight percent of calcium carbonate is increased and treated so as not to use EVA.

The reason why the weight percent of calcium carbonate is increased is to give a load balance of the salt flat plate, which is increased in overall load by the addition of the base unit 60, that is, the base portion 60 is increased as the weight of the salt flat plate increases. This is to secure the stability of the lower part of the salt flat plate by treating the load to increase.

In addition, since the EVA is vulnerable to the hot air process and may have an adverse effect of crying or wrinkling, the base unit 60 in the second embodiment based on the hot air process is treated so as not to use the EVA.

According to the second embodiment according to the present invention, when manufacturing the salt flat sheet by the hot air treatment method, the bottom surface is not crying or bumpy, so that the load is directed to the lower side, which can boast of excellent adhesion to the salt ground. There is a characteristic that it can provide a floor plate.

Figure 3 is a schematic diagram illustrating a schematic configuration of a salt flat plate assembly according to the present invention.

As can be seen from Figure 3, the torsion plate according to the present invention can be combined with the adjacent torsion plate in the state having the configuration of the first embodiment described above, which is referred to as a torsion plate assembly in the present invention.

That is, since it is inefficient to manufacture a salt flat plate to cover the salt flat consisting of a fairly large area with one salt flat plate, as shown in FIG. 3, one side of the flat plate has a plurality of salt flat plates by stacking so as to overlap stepwise. To cover the torsion.

At this time, the upper layer portion 10 is made shorter than the width of the first nonwoven fabric (melting medium) 30 by about 5cm at one side, that is, the second nonwoven fabric 40 formed in the lower portion of the separate salt plate The upper layer portion 10 is not formed at the portion to be joined with the first portion, so that the first nonwoven fabric 30 (exactly, the molten medium) is exposed to the outside. Thus, the site | part which cut | disconnected and processed about one side edge | side of the upper layer part about 5 cm is called the cutting process part 15.

As a result, the second nonwoven fabric 40 of the salt toner plate positioned at the upper side is seated on the side end of the salt toner plate disposed at the lower portion thereof, that is, the deletion processing unit 15. In this case, the second nonwoven fabric 40 is externally disposed due to the deletion processing unit 15. The first nonwoven fabric 30 (melt medium) exposed to the furnace is contacted.

Between the first nonwoven fabric 30 of the first salt flat plate and the second nonwoven fabric 40 of the second salt flat plate, the above-mentioned melt medium 50 is introduced or a first nonwoven fabric of the first salt flat plate in a film form in advance. Since it is laminated | stacked on 30, the 1st nonwoven fabric 30 of a 1st salt torsion board | substrate, the 2nd nonwoven fabric 40 of a 2nd salt torsion board | plate, and a part of the molten medium 50 are melt-processed, The first nonwoven fabric 30 and the second nonwoven fabric 40 of the second torsional floor plate may be integrally melt-bonded, and at the same time, the bonding portion may protrude to provide a foundation for preventing the problem of mounting during dyeing.

In other words, when a bonding is made between the upper surface of the upper layer portion 10 of the lower salt plate and the lower surface of the second nonwoven fabric 40 of the upper salt plate, the melting medium 50 is introduced therebetween to melt. When the bond is formed, the surface of the binding site becomes rugged or does not have a uniform thickness as compared to other sites, which may cause unnecessary stepping at the binding site of the torsion plate. By cutting the side end of the upper layer 10, which can be called a bonding site, to form a deletion processing unit 15 having the same concept as a bonding recess, it can be directly bonded to the first nonwoven fabric which is expected to have a more stable and smooth bonding force. I processed it so that

Figure 4 is a flow chart schematically showing a process for producing a salt toner for the first embodiment according to the present invention.

First, a calcium carbonate having 30 to 50% by weight and specific gravity of 2.5 to 2.7 based on 100% by weight of EVA and specific gravity of 0.8 to 0.9 and 100% by weight of the total weight of the lower layer 20 while having a VA weight ratio of 10 to 20%. By mixing, the lower layer part 20 is manufactured so that specific gravity may be 1.2-1.4 as a whole. At this time, in order to prevent oxidation, a carbon black master batch having 3 to 5% by weight based on the total weight of the lower layer 20 is blended and extruded into a molten plate through a melted T die in a compounding extruder. Do it.

The first and second nonwoven fabrics 30 and 40 are bonded to the upper and lower surfaces of the lower layer portion 20 extruded in this manner by a heat fusion method.

At this time, the upper surface of the first nonwoven fabric 30 is injected or applied to the molten medium 50 to laminate a portion of the upper layer portion 10 while the part of the first nonwoven fabric 30 is melted by the high heat of the molten medium and heat-sealed Through the process, a portion of the upper layer portion 10 is also melted and then cooled to allow the melting medium 50 and the first nonwoven fabric 30 to be integrally and safely bonded.

The molten medium 50 is formed in a thin film form rather than directly applying the medium in the molten state on the first nonwoven fabric 30, so that the uniformity of the surface to be bonded by being melted in the applied state through the thermal fusion process It is desirable to ensure that.

In addition, the matte finish on the upper surface of the upper layer portion 10 reduces frictional resistance during dyeing by rollers (stacks) to facilitate an easier and easier dyeing process.

As described so far, the configuration and operation of the environmentally friendly salt slate plate according to the present invention and its manufacturing method have been expressed in the above description and the drawings, but this is merely described by way of example and the spirit of the present invention is limited to the above description and the drawings. Of course, various changes and modifications are possible without departing from the technical spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a schematic lamination configuration for a first embodiment of an environmentally friendly salt field board according to the present invention.

FIG. 2 is a cross-sectional view showing a schematic lamination configuration for a second embodiment of an environmentally friendly salt field to the present invention. FIG.

3 is a cross-sectional view showing a schematic configuration of the salt flat plate assembly according to the present invention.

Figure 4 is a flow chart schematically showing a manufacturing method for a first embodiment of an environmentally friendly salt field in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

10: upper layer part 40: second nonwoven fabric

20: lower layer 50: melted medium

30: first nonwoven fabric 60: base part

Claims (6)

As an environmentally friendly salt pan, An upper layer composed of any one of PP and PE; A first nonwoven fabric laminated on a lower portion of the upper layer and made of a PET material; A molten medium that is injected between the upper layer part and the first nonwoven fabric and is melted by a heat fusion process to penetrate the upper layer part, the first nonwoven fabric, and the lower layer part; It is laminated on the lower portion of the first nonwoven fabric, and the total specific gravity is 1.2 by mixing 10 to 20% by weight of EVA, and calcium carbonate having a specific gravity of 2.5 to 2.7 and 30 to 50% by weight relative to the weight of the entire lower layer portion A lower layer formed to be 1.4; The second non-woven fabric is laminated to the lower layer portion, and made of PET and having a thickness of 1.2 to 1.5 times the first nonwoven fabric; Environmentally friendly salt-proof board characterized in that consisting of. The method of claim 1, To be laminated further below the second nonwoven fabric, And a base portion composed of calcium carbonate having 40 to 60% by weight based on the total weight of the base in a state in which the specific gravity is 2.5 to 2.7 with any one of LDPE and HDPE. The method of claim 1, The lower layer, An environmentally friendly salt free plate, characterized in that it has a thickness of 70% of the total thickness of the salt plate. delete As a method for producing an environmentally friendly salt plate, A material for preparing the material of the lower layer so that the specific gravity is 1.2 to 1.4 as a whole by mixing the VA having 10 to 20% by weight of EVA and 30 to 50% by weight of the total lower layer and calcium carbonate having specific gravity of 2.5 to 2.7. Stage 1; A second step of preparing a lower layer part in a molten plate-shaped body in a compounding extruder by blending the carbon black master batch of 3 to 5% by weight based on the total weight of the lower layer part; A third step of bonding the first nonwoven fabric made of PET to an upper surface of the lower layer part; A fourth step of bonding the second nonwoven fabric having a thickness of 1.2 to 1.5 times of the first nonwoven fabric while being made of PET on the lower surface of the lower layer portion; A fifth step of depositing a film-forming melt medium on the first nonwoven fabric upper surface; A sixth step of laminating an upper layer formed of any one of PE and PP on the melted medium, and then melting the melted medium and the first nonwoven fabric by a heat fusion process to bond the upper layer and the lower layer to each other. The manufacturing method of the environmentally friendly salt-proof board | substrate made into. The method of claim 5, The sixth step, The width of the upper layer is shorter than the width of the melted medium, one side of the upper layer is laminated on the melted medium in accordance with one end of the melted medium, and the other side of the upper layer is at the other end of the melted medium. Laminating so that the other end of the melting medium is exposed to the outside; And, Matting the upper surface of the upper layer; characterized in that it further comprises a.

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