JPH1136579A - Sheet for exposing pattern by washing uncured concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily form a pattern exposed on a concrete surface by washing, toy forming a pattern or a concrete-curing retarder on the surface of a base material sheet by screen printing and sticking it on a form. SOLUTION: A concrete-curing retarder is applied by screen printing on the surface of a base material sheet 1 made of paper treated in a coating- process at both faces and the base material sheet is dried and hardened to form the pattern of the retarder layer 2. An adhesive is applied to the whole rear face to form an adhesive layer 3 and a release paper 4 is stuck thereon to form an exposing sheet 5 by washing concrete. The release paper 4 is peeled off to fix the exposing sheet 5 on the surface of a form through the adhesive layer 3. The form is assembled and concrete is placed. The form and the exposing sheet 5 are removed after curing and the uncured surface layer is removed by high pressure jet water to form a pattern exposed on the concrete surface. In this way, a pattern can be easily formed on the surface of concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete washing sheet for forming a washing pattern by washing a concrete surface.

[0002]

2. Description of the Related Art Conventionally, the following method has been used to form a wash-out pattern by washing out a concrete surface to express the makeup. That is, first, as shown in FIG. 7, a sheet 41 having a surface on which a concrete retarder is applied to form a retarder layer 42 is prepared, and the sheet 41 is formed into a predetermined pattern based on a pattern or an original size drawing. It is cut into a shape and attached to the surface of the mold 40 to form a pattern. At this time, the sheet 41 is
Is fixed by nailing or bonding with an adhesive. Next, as shown in FIG. 8, the mold 40 to which the sheet 41 is attached is arranged at a predetermined interval with respect to another mold 40a, and these side openings (not shown) and bottom openings are formed. Cover with a plate material 43 or the like, and concrete material 45
Pour in. In the figure, reference numeral 48 denotes an aggregate in the concrete material 45. Then, after the concrete material 45 is cured and hardened into concrete, as shown in FIG.
1 is peeled off. In this state, curing of the surface of the obtained concrete product 46 in contact with the retarder layer 42 is suppressed or delayed, and a soft uncured surface layer 44 is formed. Next, the concrete product 46 is washed out by injecting high-pressure water or the like, and as shown in FIG. 10, the concrete of the uncured surface layer 44 is washed out, so that the aggregate 48 is exposed and the fine irregularities are roughened. Face 49
Is formed, and a wash pattern is formed.

As another method, as shown in FIG. 11, a sheet 41 having a retarder layer 42 formed on the entire surface thereof is prepared, and a part of the surface of the retarder layer 42 of the sheet 41 is replaced with a paper pattern. The masking is performed by covering with a masking sheet 50 based on the original or full-scale drawing, and a pattern is formed in an unmasked portion (a portion where the retarder layer 42 is exposed). Then, the sheet 41 is placed in the form
The concrete product 46 is manufactured in the same manner as the method shown in FIGS.

[0004]

However, according to the above-mentioned method, a pattern pattern or a full scale drawing is prepared on site, and the sheet 41 is cut and laid out or masked based on the pattern or the full scale drawing. Need to be
For this reason, there is a problem that work on site is extremely complicated, the construction period is lengthened, and the construction cost is increased. Furthermore, there are problems that it is difficult to produce the same design in large quantities, it is inefficient, and it is difficult to produce a fine and complicated design pattern, and it is not possible to cope with various designs. Further, it is necessary to fix the sheet 41 to the formwork 40 with a nail, an adhesive or the like, and the work of hitting a large number of nails one by one, or applying and drying the adhesive is complicated. Furthermore, when the sheet 41 is removed from the mold 40 after use and the mold 40 is reused, a large number of nails must be pulled out, and the adhesive adhered to the surface of the mold 40 must be cleaned and removed. 40
There is a problem that it takes a lot of cost to regenerate.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a concrete washing sheet which can be easily constructed on site and can be used in various designs.

[0006]

In order to achieve the above-mentioned object, a concrete washing sheet of the present invention is provided on a surface of a base material sheet made of paper having a coating treatment applied thereon, by means of screen printing to delay concrete hardening. The gist is that a pattern is formed by the agent layer.

That is, the concrete washing sheet of the present invention has a pattern formed by a concrete hardening retardant layer formed by screen printing on the surface of a base sheet made of paper having a surface coated. Therefore, the sheet having the pattern formed by the concrete hardening retardant layer on the surface may be used as it is by sticking it to the formwork. There is no need to cut or mask the sheet based on the full scale drawing, which greatly simplifies on-site work, shortens the construction period, and reduces construction costs. Further, since the pattern is formed by the concrete hardening retardant layer by screen printing, the same design can be easily mass-produced, which is efficient and advantageous in cost. Furthermore, it is easy to produce a fine and complicated design pattern, and it can correspond to various designs. Moreover, the concrete hardening retardant layer is formed with a constant thickness,
A clean wash pattern can be formed. Furthermore, since the base sheet coated on the surface has an appropriate strength, it does not easily wrinkle when adhered and fixed to a formwork, is easy to construct, and has a clean concrete surface. In addition, since it has appropriate water absorption and water repellency, the concrete hardening retarder does not adhere more than necessary, so that the pattern can be clearly expressed, and the concrete surface can be finished finely. In addition, since paper is used, disposal of waste materials is easy. Here, in the present invention, the coating treatment includes surface coating, impregnation, lamination, vapor deposition, printing, and the like.

In the concrete washing sheet of the present invention, the base sheet is made of paper coated on both sides with a pressure-sensitive adhesive layer formed on the back surface of the base sheet. When the release sheet is adhered and the pressure-sensitive adhesive layer is covered, when fixing to the mold at the site, the release sheet is peeled off to expose the pressure-sensitive adhesive layer on the back surface of the base material sheet, It is only necessary to attach the pressure-sensitive adhesive layer to the frame surface. For this reason, there is no need to fix the sheet by hitting a large number of nails, applying an adhesive, and drying. For this reason, the work is extremely simple, the construction on site is easy, the construction period is shortened, and the construction cost is reduced.
Also, since the base sheet is fixed to the mold via the pressure-sensitive adhesive layer, even when the mold is reused after use, it is only necessary to peel and remove the base sheet together with the pressure-sensitive adhesive layer from the mold, Unlike the related art, there is no need to pull out a large number of nails or clean and remove the adhesive adhered to the surface of the mold, so that the cost of reproducing the mold is reduced.

In the concrete washing sheet of the present invention, when the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is an acrylic emulsion or a water-based pressure-sensitive adhesive, it can be peeled off while maintaining appropriate adhesiveness. Also, when the mold is reused after use, the base sheet can be easily removed and removed. In addition, these adhesives have good heat resistance, such as when a concrete material is steam cured.
Even if it is heated, it is not transferred to the mold, the base sheet can be more easily peeled and removed, and the cost of reproducing the mold is reduced.

[0010]

Next, an embodiment of the present invention will be described.

The concrete washing sheet of the present invention is a sheet in which a pattern of a concrete hardening retardant layer is formed by screen printing on the surface of a base sheet made of paper whose surface has been subjected to a coating treatment.

[0012] The concrete hardening retardant forming the concrete hardening retardant layer delays the hardening of the concrete material, and various ones can be used as long as they can be screen-printed. Absent. For example, a UV-curable resin, a substance hydrolyzed by an alkali, a substance that adsorbs calcium ions, and the like can be used.

As the above-mentioned ultraviolet-curable resin, for example,
Acrylates such as trimethylolpropane triacrylate, pentaerythritol triacrylate, and pentaerythritol tetramethacrylate; compounds obtained by reacting 2-hydroxyethyl acrylate (HEA) with tolylene diisodianate, isophorone diisocyanate; and HEA with hexanediol and isophorone diisocyanate And diacrylates of bisphenol A-diglycidyl ether.

Examples of the substance which suppresses the hardening of concrete by being hydrolyzed by an alkali include esters such as polyvinyl acetate and hemicellulose. Examples of the substance that inhibits hardening of concrete by adsorbing calcium ions include, for example, potassium and sodium salts, which have a higher ionization tendency than calcium,
Examples include phenols, cellulose, and lignin.

[0015] In addition to the above, as a substance for suppressing the hardening of concrete, unsaturated polyester resin, vinyl ester resin such as epoxy (meth) acrylate, resin having phosphonic acid group, resin such as maleate urethane prepolymer, etc. Materials, various organic substances, and inorganic substances are used. Examples of the organic substance include oxycarboxylic acids and dicarboxylic acids such as gluconic acid, galactonic acid, citric acid, tartaric acid, malic acid, succinic acid, maleic acid, glyceric acid, glycolic acid, oxalic acid, and lactic acid, and salts thereof;
Sugar alcohols such as erythritol, glycerol, ethylene glycol, glucose, galactose, glyceraldehyde, saccharose (sucrose), lactose,
Saccharides such as maltose, raffinose and dextrin; saturated polycarboxylic acids such as ligninsulfonic acid, oxalic acid and malonic acid; unsaturated polycarboxylic acids such as fumaric acid and itaconic acid; and polycarboxylic acids such as glucoheptanonic acid. Or a salt thereof, polymaleic acid, polyfumaric acid, styrene-maleic acid copolymer, polyacrylic acid, polymethacrylic acid, styrene- (meth) acrylic acid copolymer, (meth) acrylate- (meth) acrylic acid copolymer Homopolymers or copolymers of monomers having a carboxyl group such as polymers, ethylenesulfonic acid-acrylic acid copolymers or their salts, antioxidants such as ascorbic acid and isoascorbic acid, and polymers such as polyhydroxysilane and polyacrylamide; Humic acid, lignosulfonate, celtic carboxylic acids, water soluble Npun, rye powder, gum arabic, alcohols and the like. Examples of the inorganic substance include magnesium silicate, sodium tripolyphosphate, zinc oxide, boron compounds, borates, phosphates (particularly sodium hexametaphosphate), and hexafluorosilicates.

Among the above various types of concrete setting retarders, alkali-reactive concrete setting retarders such as maleic ester urethane prepolymer are water-resistant, resistant to rain and moisture, and easy to store. There is an advantage.

The concrete hardening retardants can be used alone or in combination. Further, it is preferable to dissolve or mix and disperse in an appropriate solvent to use as a liquid viscous material from the viewpoint of workability such as finishing of printing.
In this case, an adhesive, adhesive, resin liquid,
A viscosity adjusting liquid, a water-absorbing swelling agent and the like may be mixed. Also,
Properties of each concrete setting retarder (solid, liquid, viscosity,
(Depending on the particle size, PH, etc.), there is a difference in the amount of concrete material removed by washing out and the curing delay time. Therefore, the concentration, type, combination, usage method, etc. are appropriately changed to obtain the desired removal amount and curing delay. Set it to time. At this time, the removal amount by washing is such that a depth of about 1 to 3 mm (optimally 2 mm) is removed from the surface on which the concrete material is cast, for example, the reproducibility of the shape of the washed pattern and the like. It is preferable in terms of.

As described above, when a liquid viscous material is used as a concrete hardening retardant, the liquid viscous material does not flow when printed on a base sheet, so that the finish of printing is good and a uniform concrete hardening retardant is used. It is possible to form a layer (hereinafter referred to as a “retardant layer”), and it is also easy to form a fine and complicated design pattern. In addition, the retarder layer, which was dried and solidified after applying the concrete curing retarder,
The shape is maintained, and does not collapse when concrete is cast, and a pattern with a washout surface that faithfully reproduces the design shape can be formed.

The base sheet is not particularly limited, and various kinds of paper, such as paper, non-woven fabric, cloth, plastic film, rubber sheet, wood board, and metal plate, may be used. These may be used as they are or may be subjected to a coating treatment. Among them, paper having a coating treatment on the surface or both surfaces is particularly preferable. For example, a release agent obtained by mixing silicon resin, polyvinyl alcohol, vinyl acetate resin, starch urea resin, melamine resin, glyoxal, ketone aldehyde, etc., petroleum wax emulsion, aqueous solution of fatty acid derivative, emulsion synthetic resin, chromate salt, etc. Coated paper, paper laminated with films of polyethylene resin, polypropylene resin, polystyrene resin, aluminum foil, etc., latex such as SBR, NBR, NR, polyacrylate, polyvinyl acetate resin, polyurethane , Petroleum waxes such as paraffin wax and microcrystalline wax, resin materials such as phenolic resin, melamine resin, polyester resin, paper impregnated with zinc chloride solution, various metal materials, and non-metallic materials are deposited. Paper, the mark of the above resin material, etc. Paper has been performed, and the like. That is, in the present invention, the coating treatment includes coating, lamination, impregnation, vapor deposition, and the like. According to the paper on which the surface or both surfaces are coated, it has an appropriate strength, so that it does not easily wrinkle when adhered and fixed to a mold. Moreover, since it has moderate water absorption and water repellency, the concrete hardening retarder does not adhere more than necessary. In particular, in the case where the coating treatment is performed on both surfaces, these effects are large. In addition, since it is paper, disposal of waste materials is easy.

As the above-mentioned base sheet, paper coated on both sides is used, an adhesive layer is formed on the back surface of the base sheet, and a release sheet is attached to the adhesive layer to form the above-mentioned adhesive sheet. It is preferable to cover the agent layer.

The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer includes:
There is no particular limitation, and various types are used.
For example, chloroprene rubber contact adhesive, vinyl acetate resin emulsion adhesive, vinyl acetate resin paste, mastic adhesive, polyvinyl alcohol, epoxy resin adhesive, ethylene-vinyl acetate copolymer emulsion, acrylic emulsion adhesive, polyurethane Examples include adhesives, phenolic resin adhesives, urea resin adhesives, solvent cements, dope cements, monomer cements, α-olefin-based adhesives, instantaneous adhesives, and water-based pressure-sensitive adhesives. Among these, an acrylic emulsion adhesive or an aqueous pressure-sensitive adhesive is particularly preferable. According to these, since it also has a releasability while maintaining an appropriate adhesiveness, the substrate sheet can be easily removed and removed even when the mold is reused after use. In addition, these pressure-sensitive adhesives have good heat resistance, and are not transferred to a mold even when heated, such as when a concrete material is steam-cured. The regeneration cost is reduced. In addition, if an acrylic emulsion adhesive is used, screen printing is easy and excellent in productivity and the like. In addition, with a water-based pressure-sensitive adhesive, a sharp pattern can be printed, a variety of patterns can be drawn, and excellent leveling properties can be obtained, and uniform application can be achieved.

The release sheet is not particularly limited, and various types may be used. For example, a release agent obtained by mixing silicon resin, polyvinyl alcohol, vinyl acetate resin, starch urea resin, melamine resin, glyoxal, ketone aldehyde, etc., paper impregnated with a release agent such as silicone wax, resin film, etc. Is raised. Among these, paper impregnated with silicone wax is particularly preferred because the release agent does not migrate and the release property is good.

The concrete washing sheet of the present invention can be produced, for example, as follows. That is, as shown in FIG. 1 and FIG. 2, a concrete hardening retardant is applied by screen printing to the surface of a base material sheet 1 on which both surfaces have been subjected to a coating treatment, and dried and solidified to form a pattern formed by the retarder layer 2. Form. Here, the drying and solidification are performed by various methods such as natural standing, hot air drying, and infrared drying, and are not particularly limited. The drying condition is also performed under various conditions depending on the type of concrete hardening retardant to be used and the like, but is generally performed at room temperature to about 60 ° C. for several tens of minutes to several hours. The thickness of the retarder layer 2 thus formed is preferably about 0.05 to 2 mm. If it is less than 0.05 mm, sufficient hardening inhibiting effect of concrete cannot be obtained, and if it exceeds 2 mm, the amount of concrete material washed out becomes too large, the yield is deteriorated, and it is necessary to repeat printing and drying many times. This causes productivity to deteriorate.

On the other hand, an adhesive is applied to the entire back surface of the base sheet 1 to form an adhesive layer 3. At this time, as a method of applying the pressure-sensitive adhesive, various methods such as screen printing and roll coater application are performed in addition to spray coating and brush coating. And this adhesive layer 3
A sheet for concrete washing out (hereinafter referred to as a “sheet for washing out”) 5 is formed by adhering a release sheet 4 on the top and covering the pressure-sensitive adhesive layer 3.

Using the washing sheet 5, a concrete product can be produced, for example, as follows. That is, first, the release sheet 4 adhered to the back side of the washing sheet 5 is peeled off to expose the pressure-sensitive adhesive layer 3. Next, as shown in FIG. 3, the pressure-sensitive adhesive layer 3 of the washing sheet 5 having the pressure-sensitive adhesive layer 3 exposed on the back side is adhered and fixed to the surface of the mold 6. in this way,
At the time of fixing the washing sheet 5 to the mold 6, it is only necessary to peel the release sheet 4 and stick the exposed pressure-sensitive adhesive layer 3 to the surface of the mold 6. Also,
When the mold 6 is reused after use, it is only necessary to peel and remove the base sheet 1 together with the pressure-sensitive adhesive layer 3 from the mold 6, so that the cost of recycling the mold 6 is reduced.

Next, as shown in FIG. 4, the mold 6 to which the washing sheet 5 is fixed is arranged at a predetermined interval with respect to other molds 6a, and these side openings (not shown). ) And the bottom opening is closed with a plate 7 or the like, and a concrete material 8 is poured from the top opening. In the figure, 9 is an aggregate in the concrete material 8. Then, after the concrete material 8 is cured and hardened into concrete, as shown in FIG. 5, the formwork 6 and the washing sheet 5 are separated from the concrete product 10. In this state, the portion of the surface of the obtained concrete product 10 which has come into contact with the retarder layer 2 is a soft uncured surface layer 11 whose curing has been suppressed or delayed and which has been softened.
Is formed. Next, the concrete product 10 is washed out by injecting high-pressure water or the like, and as shown in FIG. 6, the concrete of the uncured surface layer 11 is washed out, exposing the aggregate 9 and roughing the fine irregularities. Face 12
Is formed on the surface of the concrete product 10, and a washing pattern by the washing surface 13 is formed.

As described above, since only one washing sheet 5 needs to be attached and fixed to the formwork 6 as it is, the work on site is simple. Further, since the pattern formed by the retarder layer 2 is formed by screen printing, the same design can be easily mass-produced, which is efficient and advantageous in cost. Furthermore, it is easy to produce a fine and complicated design pattern, and it can correspond to various designs. Then, on the surface of the washing surface 13, the aggregate is exposed and the surface without the aggregate is formed on the rough surface 12, so that the expression of the material of the concrete is utilized. In addition, since the cured and cured concrete product 10 is washed with water or the like, the final product is cleaner than in the case where concrete is left standing.

In the above embodiment, a paper having a coating treatment on both sides is used as the base sheet 1, the pressure-sensitive adhesive layer 3 is formed on the back surface, and the release sheet 4 covers the pressure-sensitive adhesive layer 3. However, the present invention is not limited to this, and a paper having a surface coated may be used as the base sheet, and the pressure-sensitive adhesive layer 3 may not be formed.

Next, an embodiment will be described.

[0030]

Example 1 First, a base sheet 1 made of paper having both surfaces coated (laminated with a polyethylene film) was prepared. Then, the base sheet 1
A concrete hardening retarder is adjusted to the following composition with the following composition, and the adjusted liquid is applied by screen printing (application amount: 20 to 60 g / m ² ), and dried and hardened at 20 ° C. for 4 hours to form a retarder layer 2. Formed. Next, the base sheet 1
A pressure-sensitive adhesive composed of an acrylic emulsion is applied to the back surface of the substrate by screen printing (application amount: 50 to 600 g /
m ² ), the pressure-sensitive adhesive layer 3 was formed. Further, a release paper in which silicone wax was coated on the pressure-sensitive adhesive layer 3 was adhered to cover the pressure-sensitive adhesive layer 3, thereby obtaining a washing sheet 5 of the present invention (see FIGS. 1 and 2). [Composition] Biacrylic acid acetate 100 parts by weight Oxycarboxylic acid 5 parts by weight Zinc oxide 70 parts by weight Water 5 to 10 parts by weight

[0031]

Example 2 A washing sheet 5 of the present invention was obtained in the same manner as in Example 1 except that the concrete curing retarder was adjusted with the following composition. [Composition] Maleic ester urethane prepolymer (PPG, MW-300) 42 parts by weight Sucrose 3 parts by weight Xylol 4.3 parts by weight Ethyl acetate 5.3 parts by weight 45.4 parts by weight of calcium carbonate

[0032]

Example 3 A washing sheet 5 of the present invention was obtained in the same manner as in Example 1 except that the adjusting solution for the concrete hardening retardant had the following composition. [Composition] Complex of modified lignin and oxycarboxylic acid compound (trade name: Pozzolith # 100, manufactured by NSB) 100 parts by weight Water 1 to 10 parts by weight methylcellulose (trade name: Hi Metroze 4000, manufactured by Shin-Etsu Chemical Co., Ltd.) 1-5 parts by weight

[0033]

Example 4 As a concrete setting retarder, a solution prepared by dissolving 100 parts by weight of sodium gluconate (trade name: Desparite DV, manufactured by Kyoei Chemical Co., Ltd.) in 50 parts by weight of water was used, and the coating amount was 150 to 350 g. / M ² and drying and curing at 60 ° C. for 30 minutes to form the retarder layer 2,
In the same manner as in Example 1, a washing sheet 5 of the present invention was obtained.

[0034]

Example 5 A concrete hardening retardant was prepared according to the following composition, and the prepared liquid was applied to the surface of the base sheet 1 in an amount of 15%.
A washing sheet of the present invention in the same manner as in Example 1 except that the retarder layer 2 is formed by drying and curing at 20 ° C. for 8 hours to form a retarder layer 2 at 0 to 400 g / m ² (coating thickness: 0.05 to ² mm). 5 was obtained. [Composition] Vinyl acetate / acryl emulsion (trade name: Boncoat # 9180, manufactured by Dainippon Ink and Chemicals, Inc.) 80 parts by weight Polyvinyl alcohol (trade name: Denka Poval, manufactured by Denki Kagaku Kogyo) 20 parts by weight Zinc oxide 10 parts by weight Oxycarboxylate (trade name: Pozzolith, manufactured by NSB) 5 parts by weight Water 5 to 10 parts by weight

Washing sheet 5 of Examples 1 to 5
The release paper on the back side was peeled off to expose the pressure-sensitive adhesive layer 3, adhered and fixed to the formwork 6, framed, cast a concrete material, and cured and cured (FIGS. 3 and 3). 4). After the mold 6 and the washing sheet 5 are peeled off, washing is performed by spraying high-pressure water (10 kg / cm ² ) to remove the cement of the uncured surface layer 11 on the surface, thereby obtaining a concrete product 10 ( See FIG. 6). According to the above-mentioned washing sheet 5, it is not necessary to prepare a pattern pattern or a full-scale drawing of the pattern at the site, and to cut or mask the sheet based on the pattern pattern or the full-size drawing. Be transformed into Also, by washing out
The concrete product 10 in which the washing pattern was formed by the fine and complicated washing surface 13 was obtained. Also, it was extremely easy to fix to the formwork on site and the construction was easy.

[0036]

As described above, according to the present invention, a sheet having a pattern formed by a concrete hardening retardant layer on its surface may be used as it is by sticking it to a formwork. There is no need to prepare pattern paper patterns or full-scale drawings on site and cut or mask sheets based on the paper patterns or full-scale drawings, which greatly simplifies work on site, shortens construction time, and reduces costs. Is also cheaper. Further, since the pattern is formed by the concrete hardening retardant layer by screen printing, the same design can be easily mass-produced, which is efficient and advantageous in cost. Furthermore, it is easy to produce a fine and complicated design pattern, and it can correspond to various designs. In addition, the concrete hardening retardant layer is formed with a constant thickness, so that a clean wash pattern can be formed. Furthermore, since the base sheet coated on the surface has moderate strength,
When attached and fixed to the formwork, it is hard to wrinkle, easy to construct and clean up the concrete surface. Also,
Since it has moderate water absorption and water repellency, the concrete hardening retarder does not adhere more than necessary, and the pattern can be clearly expressed, and the concrete surface to be finished can be finely finished. In addition, since paper is used, disposal of waste materials is easy. Here, in the present invention, the coating treatment includes surface coating, impregnation, lamination, vapor deposition, printing, and the like.

In the concrete washing sheet of the present invention, the base material sheet is made of paper coated on both sides with a pressure-sensitive adhesive layer formed on the back surface of the base material sheet. When the release sheet is adhered and the pressure-sensitive adhesive layer is covered, when fixing to the mold at the site, the release sheet is peeled off to expose the pressure-sensitive adhesive layer on the back surface of the base material sheet, It is only necessary to attach the pressure-sensitive adhesive layer to the frame surface. For this reason, there is no need to fix the sheet by hitting a large number of nails, applying an adhesive, and drying. For this reason, the work is extremely simple, the construction on site is easy, the construction period is shortened, and the construction cost is reduced.
Also, since the base sheet is fixed to the mold via the pressure-sensitive adhesive layer, even when the mold is reused after use, it is only necessary to peel and remove the base sheet together with the pressure-sensitive adhesive layer from the mold, Unlike the related art, there is no need to pull out a large number of nails or clean and remove the adhesive adhered to the surface of the mold, so that the cost of reproducing the mold is reduced.

In the concrete washing sheet of the present invention, when the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is an acrylic emulsion or a water-based pressure-sensitive adhesive, it can be peeled off while maintaining appropriate adhesiveness. Also, when the mold is reused after use, the base sheet can be easily removed and removed. In addition, these adhesives have good heat resistance, such as when a concrete material is steam cured.
Even if it is heated, it is not transferred to the mold, the base sheet can be more easily peeled and removed, and the cost of reproducing the mold is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a concrete washing sheet of the present invention.

FIG. 2 is a cross-sectional view showing the concrete washing sheet.

FIG. 3 is an explanatory view showing a state in which the concrete washing sheet is attached to a formwork.

FIG. 4 is an explanatory view showing a state where a concrete material is cast using the concrete washing sheet.

FIG. 5 is an explanatory view showing a state in which a mold and a sheet are separated from a concrete product.

FIG. 6 is an explanatory view showing a state where an uncured surface layer of a concrete product is removed by washing out.

FIG. 7 is an explanatory diagram showing a state in which a conventional concrete washing sheet is attached to a mold.

FIG. 8 is an explanatory view showing a state where a concrete material is cast using the concrete washing sheet.

FIG. 9 is an explanatory view showing a state in which a mold and a sheet are separated from a concrete product.

FIG. 10 is an explanatory view showing a concrete product.

FIG. 11 is an explanatory view showing a state in which another conventional concrete washing sheet is adhered to a formwork.

[Explanation of symbols]

 1 base sheet 2 retarder layer

Claims (3)

[Claims] 1. A concrete washing sheet characterized in that a pattern of a concrete hardening retardant layer is formed by screen printing on a surface of a base sheet made of paper having a surface subjected to a coating treatment. 2. The base sheet is made of paper coated on both sides with a pressure-sensitive adhesive layer formed on the back surface of the base sheet, and a release sheet is attached to the pressure-sensitive adhesive layer. The concrete washing sheet according to claim 1, wherein the pressure-sensitive adhesive layer is covered. 3. The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is an acrylic emulsion or an aqueous pressure-sensitive adhesive.
The sheet for washing concrete described.