KR20190016187A - Method of preparing patterned Concrete Block using laser marking machine - Google Patents

Abstract

The present invention relates to a method for manufacturing a concrete block, wherein the method displays a pattern by laser-processing a concrete block manufactured with a black aggregate and a cement paste layer of a color contrasted to a black color. A method for manufacturing a pattern concrete block of the present invention uses laser processing, and thus it is possible to minimize dust generation and provide a color pattern to a block even without a separate painting process (printing). In addition, the manufacturing method of the present invention can maintain durability of a block with respect to external corrosion, friction, and impact because only a part of an upper layer is dug instead of forming a text by engraving the entire depth of the block. Moreover, since a pattern color of the present invention is the color of an aggregate, the color is not peeled off due to external friction, and a problem of discoloration over time is not caused. The present invention provides various colors of blocks by injecting pigments of different colors into a cement paste layer. Furthermore, compared to a method of applying or printing a specific color onto a surface, the present invention can maintain a color for a long period of time by uniformly mixing a pigment with paste or a paste layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a concrete block using a laser marking machine,

The present invention relates to a method of manufacturing a patterned concrete block using a laser marking machine, and more particularly, to a method of manufacturing a concrete block using a laser marking machine, .

Sideways separated from the roadway typically have a sidewalk block. Such a sidewalk block has various colors to form a colorful pattern on the surface of the pavement of the sidewalk block, and thus it is widely used not only for the above road but also for outdoor use such as a square or parking lot.

Generally, in the construction of the sidewalk block, after arranging the foundation ground, the foundation layer is formed with the aggregate, the sand is laid on the sidewall, the single sidewalk block is continuously installed on the sidewall, .

Such a walkway block should be manufactured robustly in order to ensure the safety of pedestrians by separating the roadway and the sidewalk, and should have a structure capable of withstanding external environment changes such as rain, wind and cold as it is installed outdoors.

Recently, a press block capable of guiding a pedestrian by displaying a character on the press block itself has been developed. Among these, a press block provided with a relief or depressed character is disclosed in Registration Utility Model No. 20-0357134. The utility model divides the character into a full-thickness block over the entire thickness of the block to form an embossed block or emboss the embossed block. But. The utility model requires a great deal of time and labor in addition to the generation of dust in the process of engraving characters on the whole block, and the block surface may be roughened or the blocks may be broken during the work process. Further, However, there is a problem that a separate painting process must be performed on the embossed character portion in order to display the color.

Japanese Patent Laid-Open No. 10-1686222 discloses a character display press block made of a character formed body and cured by injecting a mixture (cement or the like) around the character molded body. However, since the above-mentioned patent requires a process of making a separate character-formed body (all steps of pressurization and curing are performed), and the surface mixture is injected around the molded body, But also complicates the task.

It is an object of the present invention to minimize the generation of dust and to provide a pattern on a block without a separate production mold (character forming body) for each character pattern.

An object of the present invention is to provide a block of color hues to a block without a separate painting or painting step.

The present invention provides a method for manufacturing a patterned concrete which can reduce the manufacturing time by simplifying the working process.

One aspect of the present invention is

A cement paste composition comprising a cement paste and a black system aggregate containing cement, a water-based resin, an admixture and a pigment, wherein the cement paste is a concrete block composition for laser marking which exhibits a color other than the black- Lt; / RTI >

In another aspect,

A method for manufacturing a concrete block for laser marking comprising the steps of placing the composition into a block forming mold, molding a concrete block, and curing the molded block.

In yet another aspect,

A black body aggregate, a block body including a hardened cement paste filled in the gap between the aggregates, and a cement paste layer surrounding the body and cured to a predetermined thickness,

Wherein the cement paste and the cement paste layer are pastes mixed with cement, an aqueous resin admixture and a pigment,

The cement paste and the cement paste layer are related to a laser marking concrete block exhibiting red, yellow, and green colors.

In yet another aspect,

Preparing a concrete block for laser marking;

Processing a predetermined character or pattern on the block with a laser marking machine,

Wherein the processing step is a step of laser cutting a part of the paste layer of the block into a predetermined character or pattern and removing the aggregate of the black system to expose the aggregate of the black system.

Since the method of manufacturing the patterned concrete block of the present invention uses laser processing, it is possible to minimize the occurrence of dust and provide a color pattern to the block without a separate painting process (printing).

Further, since the manufacturing method of the present invention is a method of dugging the entire block depth (paste layer + block body) to form not only characters but also a part of the upper layer (paste layer or a part of the block here) It is possible to maintain the durability.

In addition, since the pattern color of the present invention is the color of the aggregate itself, the color is peeled off by external friction or no problem of discoloration occurs over time.

The present invention can provide blocks of various colors by injecting pigments of different colors into the cement paste layer. In addition, since the present invention is such that pigments are mixed evenly in the paste or paste layer, a method of applying or printing specific colors on the surface The color can be maintained for a long time.

1 is a conceptual view of a concrete block for laser marking according to the present invention.
2 is a conceptual view of a portion cut along the line A-A 'in Fig.
Fig. 3 shows an example of a laser marking machine.
4 and 5 are examples of patterned concrete that can be produced by the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the custom. Therefore, the definition should be based on the contents throughout this specification.

The present invention relates to a concrete block composition for laser marking comprising black aggregate, cement, an aqueous resin, an admixture and a pigment.

The present invention includes black aggregate and cement paste composed of cement, water-based resin, admixture and pigment.

The cement paste exhibits a color other than the black color. Preferably, the cement paste may be a color that can enhance the visibility compared to the black line. The cement paste may exhibit colors of red, yellow, and green.

The aggregate can be used without limitation as long as it is a kind showing the color of the black system. For example, the aggregate may be steel making slag aggregate, copper slag aggregate, or bottom ash aggregate. Here, the black system is a term that includes all kinds of black color such as black, dark gray, and royal blue.

There is no particular limitation on the size or specific gravity of the aggregate. For example, the aggregate may have a particle size of 0.1 to 1.2 mm and a specific gravity of 2.0 or more in consideration of uniformity of size and strength.

The cement may be any known cement. For example, the cement may be portland cement, blast furnace slag cement, white portland cement, crude steel portland cement.

The cement may have a degree of powder of at least 3,000 cm < 2 > / g.

The above-mentioned water-based resin can be used without limitation in the resin used in the known cement concrete block. For example, an acrylic resin (solid content of 18% or more) may be used as the water-based resin. The water-based resin enhances the cement-bonding force and imparts elasticity and prevents cracking of the cement. Further, in the present invention, the water-based resin can be mixed with cement and pigment to make the color of the cement paste layer clearer.

As the admixture, known admixtures for concrete blocks can be used without limitation. The admixture may be a naphthalene-based, melamine-based, or polycarboxylic-based system having a specific gravity of 1.0 or more and a yield of 5% or more.

As the pigment, known inorganic pigments can be used. For example, iron oxide, chromium oxide, or a mixture thereof may be used as the pigment. The pigment may be a pigment showing red, yellow or green pigments.

The composition is prepared by mixing 300 to 500 parts by weight of an aggregate, 10 to 40 parts by weight, preferably 20 to 30 parts by weight, 1 to 10 parts by weight, preferably 1 to 3 parts by weight of an admixture with 100 parts by weight of the cement, 3 to 20 parts by weight, preferably 5 to 10 parts by weight.

In another aspect, the present invention relates to a method for making concrete block using the composition.

The method includes placing the composition into a block forming mold and molding the concrete block and curing the molded block.

The forming step is a step of filling the mixture into a block forming mold by mixing the composition with an appropriate amount of water.

The aggregate, cement, pigment, admixture and water-based resin are mixed in a mixer and mixed for about 5 minutes or more using a fan blender to prepare a concrete block composition. The composition is stored in a hopper of a concrete block molding machine through a conveyor belt.

The composition stored in the hopper can be poured into a mold, and the concrete block can be formed by applying vibration at the bottom of the mold and compressing at the top.

The curing step is a step of curing the block forming mold while removing the block mold and managing it so as not to be adversely influenced by temperature, load, impact, damage or breakage. At this time, the curing of the block may be performed at a suitable temperature and time in the curing chamber to the curing room. For example, the curing of the block can be performed in a curing room at a temperature of about 600 cures (temperature x hours) or more. After accelerated curing, store the product until laser marking.

1 is a conceptual view of a concrete block for laser marking according to the present invention. 2 is a conceptual view of a portion cut along the line A-A 'in Fig. Referring to FIGS. 1 and 2, a concrete block for laser marking includes a body 10 and a paste layer 20.

The body 10 includes a black aggregate 11 and a cement paste 12 filled in the gap between the aggregates.

The aggregate (11) can refer to the above-mentioned black aggregate of the above-mentioned content.

The cement paste 12 is a composition including cement, an aqueous resin, an admixture and a pigment, and the above-mentioned contents can be referred to.

The cement paste layer 20 is a cement layer in which the cement paste 12 is cured to a predetermined thickness and hardened. The cement paste layer 20 surrounds the body 10 to a predetermined thickness. For example, the thickness of the cement paste layer 20 may be 1 mm to 50 mm, preferably 1 mm to 10 mm, and more preferably 2 mm to 10 mm.

The cement paste layer may be formed by mixing the cement paste 12 and aggregate, injecting the cement paste 12 into a block forming mold, and then flattening the upper layer. Since the cement paste 12 surrounds the surface of the aggregate during the mixing process with the aggregate 11, the cement paste 12 is exposed at the upper part of the mold, and when the cement paste 12 is polished, the cement paste layer 20 is formed. However, it is also possible to form the cement paste layer 20 by coating the cement paste 12 with the aggregate material 11 in a predetermined thickness after injecting the composition of the mixture of the cement paste 12 and the aggregate material 11 into the block molding mold have.

The cement paste 12 and the cement paste layer 20 show different colors except for the black color. Preferably, the cement paste 12 and the cement paste layer 20 may be colors that can enhance the visibility compared to the black line. For example, the cement paste 12 and the cement paste layer 20 may exhibit colors of red, yellow, and green.

The cement paste, the water-based resin and the pigment constituting the cement paste layer 12 and the cement paste layer 20 may be referred to above.

In another aspect, the present invention relates to a method of manufacturing a patterned concrete block using a laser marking machine. A method for manufacturing a patterned concrete block includes preparing a concrete block for laser marking and processing a predetermined character or pattern on the block with a laser marking machine.

The concrete block for laser marking can use the block as previously described.

The processing step may be any known laser marking machine without limitation. Fig. 3 shows an example of a laser marking machine. In the processing step, the shape to be marked is transferred to the PC for the laser marking machine, the block is placed in the marking machine, and then the laser marking machine is operated to form a predetermined pattern on the block. In addition, the method can finally finish by applying a sealer to the machined portion.

The output of the laser marker can be in the range of, for example, 20 to 50 watts, and the marking range is in the range of 100 to 200 mm depending on the range of the laser lens. The method is performed by using a laser marking machine to a thickness of the paste layer 20 or more to remove a portion of the paste layer 20 in the form of a predetermined character or pattern. The method may also be performed by removing even a part of the aggregate 11 under the paste layer. As a result, the method can expose the black aggregate 11 using a laser marking machine.

FIGS. 4 and 5 are examples of a patterned concrete manufactured using a laser marking machine and the block. Referring to FIGS. 4 and 5, the black color shows the aggregate portion and the yellow color shows the paste layer. Quot; smoothing area " shown on the left side of FIG. 4 is a pattern formed by removing the paste layer to a predetermined depth to expose the black aggregate, and the area of the right side " And the pattern is indicated by the color of the layer.

That is, according to the method of manufacturing the patterned concrete block of the present invention, since the laser processing is used, the pattern generation can be minimized and the color pattern can be provided to the block without a separate painting process (printing).

Particularly, in the present invention, the molded part of a pattern is dug with a laser processing machine to a predetermined depth (for example, about 2 mm) without a molded body or a mold to expose an aggregate of a black system to display a black pattern, It is possible to provide a pattern of dug cement paste color.

Further, since the manufacturing method of the present invention is a method of dugging the entire block depth (paste layer + block body) to form not only characters but also a part of the upper layer (paste layer or a part of the block here) It is possible to maintain the durability.

In addition, since the pattern color of the present invention is the color of the aggregate itself, the color is peeled off by external friction or no problem of discoloration occurs over time.

The present invention can provide blocks of various colors by injecting pigments of different colors into the cement paste layer and can also increase the brightness and saturation of the base surface by applying an aqueous acrylic resin to the cement paste layer. In particular, since the pigment is mixed evenly in the paste or the paste layer, the present invention can maintain the color for a long period of time as compared with a method of applying or printing a specific color on the surface.

Hereinafter, preferred embodiments of the present invention will be described in order to facilitate understanding of the present invention. However, the following embodiments are provided for the purpose of easier understanding of the present invention, but the present invention is not limited thereto.

Example  One

50 g of pigment (gray, D (various industries)) were mixed with a fan mixer for 5 minutes, and the mixture was kneaded in a mixer . The mixture was placed in a concrete frame and the concrete block was formed. In the curing room, curing accelerated more than 600 cities (temperature × time).

The prepared block was processed to a thickness of about 2 mm by using a laser marking machine (D, Dongha Engineering Co.) as shown in Table 1 below.

Comparative Example  One

The wet polishing method described in Japanese Patent Laid-Open No. 10-689183 (the present inventor's prior registration patent) was used, and the composition used in forming the concrete block was the same as that of Example 1 except for the pigment. Gray was used as the pigment. The embossed pattern was formed on the block by using a mold, and the pattern was formed by a wet grinding machine.

Comparative Example  2

The shot polishing method described in Japanese Patent Laid-Open No. 10-0861328 (the present inventor's prior registration patent) was used, and the composition used in forming the concrete block was the same as that of Example 1 except for the pigment. Gray was used as the pigment. A predetermined pattern was formed by colliding iron balls on the surface of the produced block (using a pattern plate).

Abrasion resistance test

The abrasion test of the pattern surface was performed with 1000 g of the abrasion wheel (CS-17) on the finishing surface for 1000 cycles. The results of the abrasion resistance test were compared with the weight loss of each coating in mg. The smaller the weight loss (mg), the greater the resistance to abrasion.

Table 1 shows the results of the abrasion resistance test of Example 1, Comparative Example 1 and Comparative Example 2 described above.

It can be confirmed that the wear loss of Example 1 is about 4 to 7 lower than that of Comparative Examples 1 and 2. [ That is, in the wet polishing or shot processing method used in Comparative Examples 1 and 2, it is understood that the impact was largely propagated throughout the block as well as the corresponding pattern area at the time of processing the finish surface. It can be seen that the impact is concentrated only on the actual machining area and the impact transmission on the other areas is not large. Therefore, the first embodiment of the present invention can manufacture a block having greater durability than the conventional shot process or wet polishing process.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be construed to include various embodiments within the scope of the claims and equivalents thereof.

Claims (6)

A composition comprising a cement paste and a black system aggregate containing cement, a water-based resin, an admixture and a pigment, wherein the cement paste exhibits a color other than the color of the black system or a color comparable to that of the black system Concrete block composition. The composition of claim 1, wherein the composition comprises
A concrete block composition for laser marking, which comprises 300 to 500 parts by weight of an aggregate, 20 to 30 parts by weight of an aqueous resin, 1 to 3 parts by weight of an admixture and 5 to 10 parts by weight of a pigment, based on 100 parts by weight of cement. The concrete block composition for laser marking according to claim 1, wherein the cement paste exhibits red, yellow, and green colors. Forming a concrete block by placing the composition of any one of claims 1 to 3 in a block molding mold; And
And curing the molded block. A blackbody aggregate, a block body including a cement paste filled in the gap between the aggregates; And
And a cement paste layer surrounding and curing the body to a predetermined thickness,
The cement paste and the cement paste layer are pastes mixed with cement, water-based resin, admixture and pigment,
Wherein the cement paste and the cement paste layer exhibit a color of a red system, a yellow system, and a green system. Preparing a concrete block for laser marking according to claim 5;
Processing a predetermined character or pattern on the block with a laser marking machine,
Wherein the machining step is a step of laser cutting a portion of the paste layer of the block into a predetermined character or pattern to remove the black aggregate.

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