CN111675983A

CN111675983A - Temperature-adjustable self-adhesive waterproof roll

Info

Publication number: CN111675983A
Application number: CN202010503691.2A
Authority: CN
Inventors: 黄斯超
Original assignee: Shenzhen Zhuobao Technology Co Ltd
Current assignee: Shenzhen Zhuobao Technology Co Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-09-18

Abstract

The invention discloses a temperature-adjustable self-adhesive waterproof coiled material which comprises a core material layer, a sizing material layer and an isolating layer, wherein the sizing material layer is arranged on at least one side of the core material layer, the isolating layer is arranged on one side of the sizing material layer, which is far away from the core material layer, and a temperature adjusting material is contained in the isolating layer. The invention has the following beneficial effects: according to the construction environment of self-adhesion waterproofing membrane, adopt appropriate temperature regulation material to adjust self-adhesion waterproofing membrane's temperature, the high temperature or the temperature is crossed lowly and is influenced the construction when avoiding self-adhesion waterproofing membrane to construct, guarantees normal construction progress, guarantees good construction quality and waterproof quality.

Description

Temperature-adjustable self-adhesive waterproof roll

Technical Field

The invention relates to the technical field of building waterproof materials, in particular to a temperature-adjustable self-adhesive waterproof coiled material.

Background

The waterproof coiled material is mainly used for building walls, roofs, tunnels, highways, refuse landfills and the like, can be curled into a roll-shaped flexible building material product for resisting external rainwater and underground water leakage, is used as a leakage-free connection between an engineering foundation and a building, is a waterproof first barrier of the whole engineering, and plays a vital role in the whole engineering.

At present, the self-adhesive waterproof coiled material on the market generally consists of a core material layer, a sizing material layer and a common isolation layer, the isolation layer is generally made of a PE (polyethylene) film or a PET (polyethylene terephthalate) film, and in the production process of the self-adhesive waterproof coiled material, because the sizing material layer has viscosity, in the process of covering the isolation layer on the sizing material layer, in order to facilitate the smooth uncovering of the isolation layer in the construction process, a layer of silicone oil is coated on the isolation layer, so that the isolation layer and the sizing material layer cannot be bonded together, and meanwhile, in order to enable the isolation layer to be adsorbed on the sizing material layer, the isolation layer is adsorbed on the sizing material layer through the principle of electrostatic adsorption; however, during summer construction, after the self-adhesive waterproof roll is exposed on a workplace, the temperature of the surface of the self-adhesive waterproof roll is as high as 60 ℃, at the moment, the glue material layer is converted from a solid state to a semi-molten semi-solid state, the silicon oil can be absorbed by the glue material in a molten state due to the same phase state of the glue material layer and the silicon oil, the isolation layer can be stuck by the viscosity of the glue material layer, and is difficult to remove, and the construction progress is slowed down; during winter construction, due to low temperature, especially in northern areas, the self-adhesive waterproof coiled material can be hardened under the low-temperature condition, and the viscosity of the hardened sizing material is greatly reduced, so that two conditions are caused: 1. the isolation layer automatically falls off, so that the self-adhesive waterproof coiled material which is not constructed is polluted, and the subsequent construction quality is influenced; 2. the viscosity of the self-adhesive waterproof coiled material is reduced, the self-adhesive waterproof coiled material is difficult to be attached to a construction surface during construction, and the waterproof quality is difficult to ensure.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a temperature-adjustable self-adhesive waterproof roll which comprises a core material layer, a glue layer, an isolation layer and a temperature adjusting material contained in the isolation layer.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a temperature adjustable self-adhesion waterproofing membrane, includes core material layer, precoat and isolation layer, at least one side on core material layer is equipped with the precoat, the precoat is kept away from one side on core material layer is equipped with the isolation layer, just the temperature regulation material has been held in the isolation layer.

Preferably, the temperature control material includes an aqueous solution and ammonium nitrate crystals, and the ammonium nitrate crystals are contained in a sealed container, the container is disposed in the insulating layer, the container isolates the ammonium nitrate crystals from the aqueous solution, by such an arrangement, when the construction is performed in summer or under an environment with a high temperature, the temperature control material employs the aqueous solution and the sodium acetate crystals, and when the construction is not performed, the ammonium nitrate crystals are contained in the container isolated from the aqueous solution without reaction with each other, before the self-adhesive waterproof roll is transported to a construction site to be prepared for construction, a worker destroys the container so that the ammonium acetate crystals are melted in the aqueous solution, the ammonium acetate crystals are very soluble in water, and the ammonium acetate crystals absorb a large amount of heat when dissolved in the aqueous solution, thereby lowering the temperature of the self-adhesive waterproof roll, the problem that the isolating layer is difficult to remove due to overhigh temperature of the self-adhesive waterproof roll is solved; and, because the specific heat capacity of aqueous solution is high, absorbs under the equal thermal condition, the temperature rise of aqueous solution is less, and under normal conditions aqueous solution is right self-adhesion waterproofing membrane has played certain cooling effect, and this kind of cooling mode cooling is effectual and with low costs.

As preferred, the container includes the sack, ammonium nitrate crystal holds in the sack, just the sack with isolation layer fixed connection, through setting up like this, the container is the sack, and is right when needs when the self-adhesion waterproofing membrane cools down, the staff only need hold between the fingers brokenly the sack can, convenient operation, and the sack with isolation layer fixed connection, the staff of being convenient for seeks ammonium nitrate crystal's position.

Preferably, the temperature regulating material comprises a supersaturated sodium acetate solution and a metal sheet, the metal sheet is fixedly connected with the isolation layer, the temperature regulating material adopts the supersaturated sodium acetate solution and the metal sheet when construction is carried out in winter or at a lower temperature, when construction is not carried out, the cooled supersaturated sodium acetate solution is temporarily in a metastable state, the supersaturated sodium acetate solution does not react with the metal sheet, before the self-adhesive waterproof coiled material is transported to a construction site for preparation, a worker pulls the metal sheet off the wire sheet, the supersaturated sodium acetate solution loses balance in the metastable state when being stimulated, excessive sodium acetate solute forms crystals on the metal sheet, and the supersaturated sodium acetate is restored to a balanced state suitable for the temperature, namely, the supersaturated sodium acetate is restored to a saturated sodium acetate solution state, the too much sodium acetate solute is in the metal forms the process of crystallization and can emits the heat, thereby it is right self-adhesion waterproofing membrane heats or keeps warm self-adhesion waterproofing membrane's temperature is crossed low and the condition that the sizing material hardens appears, thereby avoids the isolation layer is automatic to be come off and reduce construction waterproof quality, just the sheetmetal with isolation layer fixed connection avoids the in-process of transportation or transport, the sheetmetal cuts open the isolation layer.

Preferably, the temperature adjusting material includes oxygen and iron powder or aluminum powder, which is contained in a sealed container, the container is disposed in the barrier layer, the container isolating the iron or aluminum powder from the oxygen gas, by which arrangement, when the construction is carried out in a severe cold environment, the temperature adjusting material adopts oxygen and iron powder or aluminum powder, and before the construction, the iron powder or the aluminum powder is contained in the container and isolated from the oxygen, the iron powder or the aluminum powder cannot react with the oxygen, and before the self-adhesive waterproof coiled material is transported to a construction site for preparation construction, a worker destroys the container, the iron powder or the aluminum powder and the oxygen are subjected to oxidation reaction to release a large amount of heat, so that the temperature of the self-adhesive waterproof roll is obviously increased, and the construction quality and the waterproof quality of the self-adhesive waterproof roll are prevented from being reduced by a severe cold environment.

Preferably, the container comprises a bag, the iron powder or the aluminum powder is contained in the bag, the bag is fixedly connected with the isolation layer, the iron powder or the aluminum powder is contained in the bag, a worker can enable the iron powder or the aluminum powder to react with the oxygen only by pinching the bag, the operation is convenient, and the bag is fixedly connected with the isolation layer, so that the worker can conveniently find the position of the iron powder or the aluminum powder.

Preferably, the isolation layer includes a plurality of sealed isolation bags, and is a plurality of the isolation bag is followed self-adhesive waterproofing membrane's length direction sets up, every all hold in the isolation bag the temperature regulation material, through setting up like this, because every book self-adhesive waterproofing membrane's length is great, and is a plurality of the isolation bag is followed self-adhesive waterproofing membrane's length direction sets up, and every all hold in the isolation bag the temperature regulation material, can make the temperature regulation material is more even and fully right the temperature of self-adhesive waterproofing membrane is adjusted.

As preferred, adjacent two the isolation pocket is close to one side interconnect of precoat, adjacent two the isolation pocket is kept away from one side interval of precoat sets up, through setting up like this, because the precoat has the autohension, adjacent two the isolation pocket is close to one side of precoat is contradicted each other, avoids the precoat direct exposure bonds to objects such as dust or particulate matter under the construction environment and receives the pollution, and adjacent two the isolation pocket is kept away from one side interval of precoat sets up, is convenient for in the in-process of production self-adhesion waterproofing membrane carries out the rolling, otherwise, adjacent two the isolation pocket is in the in-process mutual extrusion of self-adhesion waterproofing membrane rolling, the crowded circumstances of exploding appears easily.

Preferably, the interval range of the two adjacent isolation bags far away from the side of the glue layer is 50-60mm, and by means of the arrangement, the volume of the isolation bags capable of containing the temperature adjusting materials is increased as much as possible under the condition that the self-adhesive waterproof roll is convenient to roll; if the interval between two adjacent isolation bags far away from the side of the glue layer is less than 50mm, the mutual extrusion of the two adjacent isolation bags is serious when the self-adhesive waterproof roll is rolled; if the interval between two adjacent isolation bags far away from the side of the glue layer is larger than 60mm, the volume of the temperature adjusting material contained in the isolation bags is reduced although the two adjacent isolation bags are not mutually extruded when the self-adhesive waterproof roll is rolled.

Preferably, the isolation bag is made of a polyvinyl chloride film, the thickness of the polyvinyl chloride film is 2-3mm, and by means of the arrangement, the isolation bag is made of the polyvinyl chloride film, the polyvinyl chloride film has good weather resistance compared with a traditional PE film or a traditional PET film, and the isolation bag is prevented from being hardened at a low temperature; and the thickness of the polyvinyl chloride film is 2-3mm, so that the isolation bag can have certain strength.

Compared with the prior art, the invention has the beneficial technical effects that:

adopt this temperature adjustable self-adhesion waterproofing membrane, according to self-adhesion waterproofing membrane's construction environment, adopt appropriate temperature regulation material right self-adhesion waterproofing membrane's temperature is adjusted, and the high temperature or the temperature is crossed lowly and influence the construction when avoiding self-adhesion waterproofing membrane to construct, guarantees normal construction progress, guarantees good construction quality and waterproof quality.

Drawings

FIG. 1 is a schematic cross-sectional view of a dual-sided self-adhesive waterproof roll material capable of cooling according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a dual-sided self-adhesive roll of an embodiment of the invention;

FIG. 3 is a schematic cross-sectional view of a single-sided self-adhesive waterproof roll material capable of cooling according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a single-sided self-adhesive roll of a temperature-elevating waterproofing material according to an embodiment of the present invention;

FIG. 5 is a schematic top view of a self-adhesive waterproofing membrane according to an embodiment of the present invention.

Wherein, the technical characteristics that each reference numeral refers to are as follows:

1. a core material layer; 2. a sizing layer; 3. an isolation layer; 3.1, isolating bags; 3.2, water solution; 3.3, supersaturated sodium acetate solution; 3.4, container.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following embodiments.

Referring to fig. 1-5, this embodiment discloses a temperature adjustable self-adhesion waterproofing membrane, including core material layer 1, sizing material layer 2 and isolation layer 3, core material layer 1 is the fine reinforcing matrix of glass, improve self-adhesion waterproofing membrane's intensity and toughness, at least one side of core material layer 1 is equipped with sizing material layer 2, one side of core material layer 1 is equipped with sizing material layer 2 and is single face self-adhesion waterproofing membrane, the both sides of core material layer 1 all are equipped with sizing material layer 2 and are two-sided self-adhesion waterproofing membrane, sizing material layer 2 is the rubber pitch sizing material, sizing material layer 2 bonds in one side of core material layer 1 through the autohension, one side that core material layer 1 was kept away from to sizing material layer 2 is equipped with isolation layer 3, the one side coating of isolation layer 3 and the 2 conflict contacts of sizing material has silicone oil, isolation layer 3 passes through the electrostatic absorption on sizing material layer 2.

Adopt this temperature adjustable self-adhesion waterproofing membrane, according to self-adhesion waterproofing membrane's construction environment, adopt appropriate temperature regulation material to adjust self-adhesion waterproofing membrane's temperature, the high temperature or the temperature is crossed low and influence the construction when avoiding self-adhesion waterproofing membrane to construct, guarantees normal construction progress, guarantees good construction quality and waterproof quality.

In one embodiment, the temperature regulating material comprises an aqueous solution 3.2 and ammonium nitrate crystals, the mass ratio of the ammonium nitrate crystals to the aqueous solution 3.2 is 4.44:1.00, the ammonium nitrate crystals are contained in a sealed container 3.4, the container 3.4 is arranged in an isolating layer 3, the container 3.4 isolates the ammonium nitrate crystals from the aqueous solution 3.2, when construction is carried out in summer or in a high-temperature environment, the temperature regulating material adopts the aqueous solution 3.2 and sodium acetate crystals, when construction is not carried out, the ammonium nitrate crystals are contained in the container 3.4 and isolated from the aqueous solution 3.2, self-adhesion reaction does not occur, before the waterproof coiled material is transported to a construction site for preparation, a worker destroys the sealed container 3.4 approximately half an hour before construction, so that the ammonium acetate crystals are dissolved in the aqueous solution 3.2, the ammonium acetate crystals are very soluble in water, and the ammonium acetate crystals absorb a large amount of heat when dissolved in the aqueous solution 3.2, thereby reducing the temperature of the self-adhesion waterproof coiled material, the problem that the isolating layer 3 is difficult to remove due to overhigh temperature of the self-adhesive waterproof roll is avoided; and, because the specific heat capacity of aqueous solution 3.2 is high, absorb under the equal thermal condition, the temperature rise of aqueous solution 3.2 is less, and aqueous solution 3.2 has played certain cooling effect to self-adhesion waterproofing membrane under normal conditions, and this kind of cooling mode cooling is effectual and with low costs.

Concretely, the container 3.4 includes the sack, the sack is made by the PE membrane, and the thickness of PE membrane is between 0.1-0.3mm, ammonium nitrate crystal holds in the sack, and sack and isolation layer 3 are through the mode fixed connection that bonds, and the sack bonds in one side of isolation layer 3 along self-adhesion waterproofing membrane width direction, when needs cool down to self-adhesion waterproofing membrane, the staff only need pinch the broken bag can, and convenient operation, and sack and 3 fixed connection of isolation layer, the staff of being convenient for seeks the position of ammonium nitrate crystal.

In one embodiment, the temperature adjusting material comprises supersaturated sodium acetate solution 3.3 and a metal sheet, the metal sheet is fixedly connected with the isolation layer 3 in a bonding mode, the metal sheet is fixed on one side of the isolation layer 3 along the width direction of the self-adhesive waterproof coiled material, when construction is carried out in winter or at a lower temperature, the supersaturated sodium acetate solution 3.3 and the metal sheet are adopted as the temperature adjusting material, when the construction is not carried out, the cooled supersaturated sodium acetate solution 3.3 is temporarily in a metastable state, the supersaturated sodium acetate solution 3.3 does not react with the metal sheet, before the self-adhesive waterproof coiled material is conveyed to a construction site for preparation construction, a worker breaks the metal sheet, the supersaturated sodium acetate solution is stimulated to lose balance of the metastable state, specifically, the metal sheet vibrates constantly from the microcosmic perspective, the metastable state of the supersaturated sodium acetate solution 3.3 is destroyed by using friction of the metal sheet, excessive sodium acetate solute can form crystals on the metal sheet, supersaturated sodium acetate is restored to a balance state suitable for the temperature, namely, the state of the saturated sodium acetate solution is restored, the excessive sodium acetate solute can emit heat in the process of metal crystallization, so that the self-adhesive waterproof coiled material is heated or insulated, the condition that the temperature of the self-adhesive waterproof coiled material is too low and the glue material is hardened is avoided, the isolation layer 3 is prevented from automatically falling off and the construction waterproof quality is reduced, the metal sheet is fixedly connected with the isolation layer 3, the isolation layer 3 is prevented from being cut by the metal sheet in the process of transportation or carrying, and after the isolation film containing the saturated sodium acetate solution and the metal sheet is removed, the isolation film can be directly recycled, and the isolation film is sent to a factory to heat and heat the isolation film, so that the original state of the supersaturated sodium acetate solution 3.3 can be restored, and the isolation film of the self-adhesive waterproof coiled, environmental protection and energy saving, and reduces the production cost.

In one embodiment, the temperature regulating material comprises oxygen and iron powder or aluminum powder, the isolation layer 3 is filled with pure oxygen, the iron powder or the aluminum powder is contained in a sealed container 3.4, the container 3.4 is arranged in the isolation layer 3, the iron powder or the aluminum powder is isolated from the oxygen by the container 3.4, when the iron powder and the oxygen are used as the temperature regulating material, the mass ratio of the iron powder to the oxygen is 2.33:1.00, and when the aluminum powder and the oxygen are used as the temperature regulating material, the mass ratio of the aluminum powder to the oxygen is 1.13:1.00, so that on the premise of ensuring that the iron powder or the aluminum powder and the oxygen are completely and fully reacted, the consumption is reduced, and the waste caused by excessive iron powder or; when carrying out the construction under the environment of severe cold, temperature regulation material adopts oxygen and iron powder or aluminite powder, before not being under construction, iron powder or aluminite powder hold and keep apart with oxygen in container 3.4, iron powder or aluminite powder can not take place the reaction with oxygen, before transporting self-adhesion waterproofing membrane to the job site preparation construction, the staff destroys container 3.4, iron powder or aluminite powder and oxygen take place oxidation reaction and can release a large amount of heats, make self-adhesion waterproofing membrane's temperature obviously rise, avoid receiving the environment of severe cold and reduce self-adhesion waterproofing membrane's construction quality and waterproof quality.

Further specifically describing, container 3.4 includes the sack, the sack is made by the PE membrane, and the thickness of PE membrane is between 0.1-0.3mm, iron powder or aluminite powder hold in the sack, and sack and isolation layer 3 are through mode fixed connection that bonds, and the sack bonds in isolation layer 3 along one side of self-adhesion waterproofing membrane width direction, iron powder or aluminite powder hold in the sack, the staff only need to pinch brokenly the bag, just can make iron powder or aluminite powder and oxygen take place the reaction, and convenient operation, and sack and isolation layer 3 fixed connection, the staff of being convenient for seeks the position of iron powder or aluminite powder.

The isolation layer 3 includes a plurality of sealed barrier bags 3.1, a plurality of barrier bags 3.1 set up along self-adhesive waterproofing membrane's length direction, all contained the temperature regulation material in every barrier bag 3.1, because the length of every roll of self-adhesive waterproofing membrane is great, a plurality of barrier bags 3.1 set up along self-adhesive waterproofing membrane's length direction, and all contained the temperature regulation material in every barrier bag 3.1, can make the temperature regulation material more evenly and adjust self-adhesive waterproofing membrane's temperature fully.

Two adjacent barrier bags 3.1 are close to one side interconnect of precoat 2, two adjacent barrier bags 3.1 keep away from one side interval setting of precoat 2, because precoat 2 has the autohension, two adjacent barrier bags 3.1 are contradicted each other near one side of precoat 2, avoid the precoat 2 direct exposure to bond to objects such as dust or particulate matter under the construction environment and receive the pollution, and two adjacent barrier bags 3.1 keep away from one side interval setting of precoat 2, be convenient for carry out the rolling with self-adhesion waterproofing membrane in the in-process of production, otherwise, two adjacent barrier bags 3.1 extrude each other in the in-process of self-adhesion waterproofing membrane rolling, the crowded condition of exploding appears easily.

The spacing range A of the two adjacent isolation bags 3.1 far away from the side of the glue layer 2 is 50-60mm, and the volume of the isolation bags 3.1 capable of containing temperature adjusting materials is increased as much as possible under the condition that the self-adhesive waterproof roll is convenient to roll; if the distance A between the two adjacent isolation bags 3.1 far away from the side of the glue layer 2 is less than 50mm, the mutual extrusion of the two adjacent isolation bags 3.1 is still serious when the self-adhesive waterproof roll is rolled; if two adjacent barrier bags 3.1 keep away from interval A on one side of precoat 2 and be greater than 60mm, although during the rolling of self-adhesion waterproofing membrane, two adjacent barrier bags 3.1 can not extrude each other, but reduced the volume that barrier bag 3.1 can hold the temperature regulation material, and the relative precoat 2 of barrier bag 3.1 that is located self-adhesion waterproofing membrane both ends stretches out 50-60mm along length direction, and isolation layer 3 stretches out 50-60mm along width direction relative precoat 2, guarantee that isolation layer 3 covers precoat 2 completely, and be convenient for reveal isolation layer 3.

The isolation bag 3.1 is made of a polyvinyl chloride film, the thickness of the polyvinyl chloride film is 2-3mm, the isolation bag 3.1 is made of the polyvinyl chloride film, the polyvinyl chloride film has good weather resistance compared with a traditional PE film or a PET film, and the situation that the isolation bag 3.1 is hardened under the condition of low temperature is avoided; and the thickness of the polyvinyl chloride film is 2-3mm, so that the isolation bag 3.1 can have certain strength.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The utility model provides a temperature adjustable self-adhesion waterproofing membrane, its characterized in that, includes core material layer (1), sizing material layer (2) and isolation layer (3), at least one side on core material layer (1) is equipped with sizing material layer (2), sizing material layer (2) are kept away from one side on core material layer (1) is equipped with isolation layer (3), just the temperature regulation material has been held in isolation layer (3).

2. The self-adhesive waterproofing membrane according to claim 1, wherein the temperature regulating material comprises an aqueous solution (3.2) and ammonium nitrate crystals and the ammonium nitrate crystals are contained in a sealed container (3.4), the container (3.4) being provided in the insulating layer (3), the container (3.4) insulating the ammonium nitrate crystals from the aqueous solution (3.2).

3. A self-adhesive waterproofing membrane according to claim 2, wherein the container (3.4) comprises a bag, the ammonium nitrate crystals being contained within the bag and the bag being fixedly connected to the barrier layer (3).

4. The self-adhesive waterproofing membrane according to claim 1, wherein the temperature regulating material comprises a supersaturated sodium acetate solution (3.3) and a metal sheet, and the metal sheet is fixedly connected with the isolation layer (3).

5. The self-adhesive waterproofing roll according to claim 1, wherein the temperature regulating material comprises oxygen and iron or aluminium powder contained in a sealed container (3.4), the container (3.4) being arranged in the barrier layer (3), the container (3.4) isolating the iron or aluminium powder from the oxygen.

6. Self-adhesive waterproofing membrane according to claim 5, wherein the container (3.4) comprises a bag, the iron or aluminium powder being contained in the bag and the bag being fixedly connected to the barrier layer (3).

7. A self-adhesive waterproofing membrane according to any of claims 1 to 6, wherein the barrier layer (3) comprises a plurality of sealed barrier bags (3.1), a plurality of said barrier bags (3.1) being provided along the length of the self-adhesive waterproofing membrane, each of said barrier bags (3.1) containing said temperature regulating material therein.

8. A self-adhesive waterproofing membrane according to claim 7, wherein the side of two adjacent barrier bags (3.1) close to the mastic layer (2) is connected to each other, and the side of two adjacent barrier bags (3.1) away from the mastic layer (2) is arranged at intervals.

9. A roll according to claim 8, characterised in that the spacing of two adjacent separator sacks (3.1) on the side remote from the mastic layer (2) ranges between 50 and 60 mm.

10. A self-adhesive waterproofing roll according to claim 9, wherein the barrier bag (3.1) is made of polyvinyl chloride film and the thickness of the polyvinyl chloride film is 2-3 mm.