JP2007222782A - Method of manufacturing designed building material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a production yield of a designed building material from lowering by preventing deterioration of the design quality of the designed building material which arises from ink-jet printing or clear paint coating thereafter. <P>SOLUTION: A method of manufacturing the designed building material comprises the steps of: jetting and fixing dots of an aqueous ink on a printing surface by applying jet printing on the printing surface using an aqueous ink having substantially no resinous constituent while forming the printing surface by coating the surface of a substrate with a printing-surface-forming paint and maintaining a temperature of the printing surface within the range of 35-80°C; thereafter decreasing an amount of a solvent in the aqueous ink dots fixed on the printing surface by not less than 20 mass% based on the amount right after fixed by drying the printing surface applied by ink-jet printing; and thereafter coating the dried printing surface with a clear paint. The printing-surface-forming paint is such that the diameter of the fixed ink is within the range of 60-100 μm when a dot of an aqueous ink having a colorant concentration of 5.5 mass% and a volume of 17 pl is jetted and fixed on the printing surface formed using it. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a designable building material.

  In recent years, higher designability is required for building materials. Various methods have been taken to impart design properties to building materials, but specific examples of those that are most frequently used include the application of paints, that is, the provision of design properties by painting. The advantage of painting is that it can be easily colored to a desired color by applying a pre-colored paint to the object (base material for building materials as the object to be coated), and an appropriate coating method depending on the shape of the object. By changing, it can be applied to a wide range of objects.

  However, on the other hand, if the design applied by painting is seen in a relatively narrow area, it is only possible to apply a design of about two colors at most using the unevenness of the surface of the base material for building materials. It is difficult to attach a pattern or the like having higher design properties.

  On the other hand, printing is used as a method for imparting a design having a higher design property to a building material. Among these printings, in particular, printing using an ink jet printer, that is, ink jet printing has attracted attention in recent years. As an advantage of inkjet printing, since printing can be performed by ejecting ink in a non-contact state on the object, it can be applied even to a surface of the printing object having irregularities, and Since a desired coloring or patterning can be performed only on a portion required for each relatively narrow region, it is possible to give a wider design to a building material.

Various techniques have been studied for these ink jet printing, and a typical example thereof is Japanese Patent No. 2636693 (Patent Document 1). This patent document discloses a method for obtaining a designable building material by ink jet printing.
Japanese Patent No. 2636693

  By the way, in order to prevent clogging of ink discharge nozzles in an ink jet printer, it is effective to use ink that does not contain a resin component. However, when the surface of the base material for building materials is colored or patterned by ink jet printing in which such an ink is ejected by an ink jet printer, the weather resistance of the colored portion or the pattern formed by the ejection ink is left as it is. It is difficult to obtain a low building material having good characteristics. Therefore, in order to protect the colored portions and patterns formed by the discharge ink and improve the weather resistance of the building material, it is generally performed to apply a clear paint from the colored portions and patterns.

  However, if the clear paint is applied after applying the ink that does not contain the resin component, the ink bleeds or if the substrate has an uneven surface, the clear paint flows into the recesses immediately after the clear paint is applied. However, the discharged ink also flows unevenly to the recesses, and there may be a problem that the design property of the finally obtained building material is deteriorated. Such a problem occurs remarkably when clear paint is applied in a state where the evaporation of volatile components in the ink droplets deposited on the printing surface is insufficient and the ink is not sufficiently fixed to the printing surface. To do. The occurrence of such a situation leads to a decrease in the designability of the manufactured design building materials, and also leads to a decrease in the manufacturing yield of the design building materials depending on the required degree of design properties. The solution to the problem was desired.

  An object of the present invention is to suppress the deterioration of the designability of the design building material generated by the ink jet printing as described above and the subsequent application of the clear paint, and further to suppress the decrease in the production yield of the designability building material. . Another object of the present invention is to obtain a designable building material with good performance such as designability and practical use with a good production yield in a method for producing a designable building material by applying a clear paint after inkjet printing. It is in.

  As a result of intensive studies, the present inventors have found that the above problems can be solved by specifying specific conditions for ink jet printing and subsequent conditions for applying clear paint. This has led to the present invention.

That is, according to the present invention, the above object is achieved as follows:
A method for producing a designable building material by applying a clear paint after inkjet printing,
Apply the printing surface forming paint on the surface of the substrate to form the printing surface,
While the temperature of the printing surface is maintained at 35 to 80 ° C., ink-jet printing is performed on the printing surface using a water-based ink that does not substantially contain a resin component, and the water-based ink dots are formed on the printing surface. And then
The surface to be printed on which the inkjet printing has been performed is dried, and the amount of the solvent in the water-based ink dots deposited on the surface to be printed is reduced by 20% by mass or more based on immediately after the ink dots are deposited.
A method for producing a designable building material, wherein a clear paint is applied to the dried printing surface,
Is provided.

In one aspect of the present invention, the printing surface-forming coating material contains porous hydrophilic resin particles, and the hydrophilic resin particles have a true specific gravity in the range of 0.7 to 2.0 g / cm ³ . It is in. In one aspect of the present invention, the printed surface forming paint has a water absorption of 2.0 to 10.0 g / m ^{2 on} the printed surface formed using the coating surface forming paint. In one aspect of the present invention, the printed surface-forming coating material ejects one dot of the water-based ink having a pigment-containing concentration of 5.5% by mass and a volume of 17 pl on the printed surface formed using the paint. When deposited, the diameter of the deposited ink is in the range of 60 to 100 μm. In one aspect of the present invention, the clear paint comprises a binder and a solvent having a solubility parameter of 7 to 23.4, and the solvent is blended in an amount of 45 to 85% by mass.

  According to the method for producing a designable building material of the present invention, since the conditions at the time of ink jet printing and the conditions at the time of subsequent application of the clear paint are specified, deterioration in image quality at the time of ink jet printing is suppressed, and thereafter Occurrence of ink bleed during application of clear paint is suppressed, deformation of the substrate during ink jet printing is suppressed to a small extent, and contact of the ink discharge nozzle with the substrate is prevented, and performance such as good design properties It is possible to produce a practical building material having a good yield.

  Hereinafter, an embodiment of a method for producing a designable building material according to the present invention will be described.

  In one embodiment of the present invention, the following steps are generally performed. That is, first, a printing surface for inkjet printing is formed on a surface of a substrate used for manufacturing a designable building material by performing inkjet printing and application of a clear paint. Hereinafter, the coating material for forming the printing surface is referred to as “printing surface forming coating material”. If necessary, a sealer may be applied to the surface of the substrate prior to the formation of the printing surface. Next, inkjet printing using a water-based ink that does not substantially contain a resin component is performed on the printing surface, and patterning and / or coloring is performed on the printing surface. Next, the printing surface subjected to inkjet printing is dried. Next, a clear paint is applied to the dried printing surface. Hereinafter, details of each process will be described.

  As a base material, it is possible to use any base material for building materials that has been conventionally used in construction applications. As such a building material base material, representatively, a metal base material made of aluminum, iron and stainless steel, a metal base material such as a galvanized iron plate, a flexible board, a calcium silicate plate, a gypsum slag perlite plate, Examples thereof include inorganic base materials such as wood chip cement board, precast concrete board, ALC board and gypsum board. The base material is not limited to an inorganic material, and an organic material such as a hard plastic can be used depending on the application and usage form of the design building material. These base materials may have a smooth surface or may have an uneven shape.

  A sealer can be applied in advance to the surface of the base material according to the surface condition of the base material so that the printing surface can be formed under as little variation as possible. The sealer can be appropriately selected according to the type of base material and the performance required for the base material. Also, the application amount and drying conditions of the sealer can be appropriately changed according to the composition of the sealer and the performance required for the substrate.

In the present invention, any sealer conventionally used for manufacturing building materials can be used. However, it is particularly preferable to use a sealer in which the water absorption of a coating film (dry film) [film surface] formed using the same is 0.1 to 10.0 g / m ² . The sealer includes a binder and a solvent, and can contain a filler, an additive, and the like as necessary.

  As the binder for the sealer, any binder used in conventional sealers can be used. Examples of such binders include, but are not limited to, epoxy resins, acrylic resins, urethane resins, fluororesins, inorganic resins, acrylic silicon resins, alkyd resins, and the like.

  As the solvent for the sealer, any solvent used in conventional sealers can be used. Examples of such solvents include aromatic hydrocarbons such as toluene and xylene: acetates such as ethyl acetate and butyl acetate: ketones such as methyl ethyl ketone and methyl isobutyl ketone: alcohols such as isopropyl alcohol and butyl alcohol Class: Further, one type or a combination of two or more types selected from various aliphatic hydrocarbons, glycol ethers, water and the like can be mentioned as representative examples, but is not limited thereto.

  Sealer fillers include titanium oxide, zinc oxide, zinc sulfide, carbon black, chrome lead, ocher, valve stem, composite oxides (nickel / titanium, chromium / titanium, bismuth / vanadium). Inorganic pigments and organic pigments such as phthalocyanine blue, carmine FB, quinacridone, diketopyrrolopyrrole, benzimidazolone, isoindolinone, anthrapyramidine, selenium, dioxazine are generally used for paints. Various organic or inorganic color pigments: porous inorganic powders such as talc, kaolin, barium sulfate, calcium carbonate, mica, silica powder, diatomaceous earth, amorphous silica, allophane, imogolite, bentonite, montmorillonite, sepiolite, etc. Or a polyacrylate copolymer (polyacrylic acid Tellurium polymer, outer shell includes polymer of core-shell structure of sodium acrylate polymer), saponified vinyl acetate-acrylic acid ester copolymer, saponified vinyl acetate-maleic acid ester copolymer, isobutylene-anhydrous Typical examples include, but are not limited to, organic extender pigments such as powdered or suspended organic resins such as maleic acid copolymers and polyethylene oxide cross-linked products.

  Additives for sealers include antifoaming agents, leveling agents, UV absorbers, film forming aids, light stabilizers, antibacterial agents, crosslinking accelerators, dispersants, suspending agents, wetting aids for ink solvents, etc. Can be mentioned. Additives can be added as appropriate according to need, and the amount of each additive can be appropriately changed according to the purpose of the sealer.

  The printing surface forming coating applied to the surface of the base material or the surface of the base material coated with sealer as required contains a binder and, if necessary, other fillers, solvents, additives, etc. Is possible. Moreover, the printing surface forming coating material does not ask | require the distinction of paint properties, such as a water system, a solvent system, and a powder system.

As the printing surface-forming coating material, it is preferable to use a coating material having a water absorption of 2.0 to 10.0 g / m ² in a coating film (dried film) [printing surface] formed using the coating surface forming coating material. . When the water absorption amount of the dry film is lower than 2.0 g / m ² , the ink absorption capacity of the printing surface is reduced, so that the image quality of the printed image is lowered and the design property of the design building material directly. Or smearing of the discharged ink may occur during the application of the clear paint, and the designability of the design building material may be lowered indirectly. On the other hand, when the water absorption amount of the dry film is higher than 10.0 g / m ² , the ink is excessively absorbed, so that the image quality of the printed image is lowered and the design property of the design building material is lowered. There are things to do. However, the degree of performance deterioration such as these deteriorations in designability is not such that the resulting designable building material becomes inoperable, and the practical design having performances such as the designability intended by the present invention. A characteristic building material can be obtained.

Here, the said water absorption refers to the numerical value measured with the following method. It should be noted that all the operations in the following method are performed in a temperature-controlled room, for example, under conditions of a temperature of 23 ° C. and a humidity of 50%. A printing surface forming paint is applied to one main surface of a glass plate (dimensions 200 mm × 250 mm × 2 mm) by spray coating. In this coating, the coating amount is set to 40 g / m ² in terms of dry mass so that the coating film surface is smooth and the film thickness is averagely distributed over the entire glass plate. When the coated surface-forming paint to be printed is of a room temperature drying type, forced drying is performed at 80 ° C. for 30 minutes. When the coated surface-forming paint to be printed is of a baking drying type, baking drying is performed at 150 ° C. for 30 minutes. After the drying, it is left to stand for 168 hours in a constant temperature room at a temperature of 23 ° C. and a humidity of 50%. Thereafter, the edge of the glass plate on which the coating film is formed is sealed with a silicon caulking agent having no water absorption. This sealing is performed to prevent water from penetrating from the outer peripheral portion (portion corresponding to the edge of the glass plate) and water from flowing out between the coating film and the glass plate. Avoid getting on the surface. Further, the silicon caulking agent is swelled to a height of 3 mm on the surface of the glass plate on which the coating film is formed, and prevents water from spilling when water is poured onto the coating film surface maintained horizontally. The sample obtained as described above is held in a temperature-controlled room at a temperature of 23 ° C. and a humidity of 50% for 24 hours, and then the mass of the sample is measured, and this measured value is taken as the initial mass. Next, place the sample in a horizontal place, pour 200 g of water onto the surface of the sample (the surface on which the coating film for the printing surface forming paint is formed) so that the entire surface gets wet, and immediately after that, Tilt to remove water. Thereafter, the sample is placed on a towel (for example, “Kim Towel” manufactured by Crecia Co., Ltd.) with the back side down, and water attached to the back side is removed, and excess water adhering to the surface is also wiped off with a towel. Immediately after the removal of excess water, measure the mass. The time from pouring water to measuring the mass should be as short as possible, with a maximum of 1 minute. The amount of water absorption is calculated based on the above measurement result:
Water absorption (g / m ² ) =
(Mass immediately after wiping (g) −initial mass (g)) × 20 (/ m ² )
Calculated by

  In addition, the printed surface forming coating material ejects 1 dot of water-based ink having a pigment content concentration of 5.5% by mass and a volume of 17 pl on a coating film (dried film) [printed surface] formed using the coating surface forming coating material. When deposited, the diameter of the ejected ink dots is preferably in the range of 60-100 μm, more preferably in the range of 63-90 μm. By using a printing surface-forming paint having a composition such that the diameter of the discharged ink dot falls within the above range, the discharged ink is appropriately absorbed, and high-quality image formation is further facilitated. When the diameter of the discharged ink dot is smaller than 60 μm, adjacent ones of the discharged dots formed on the printing surface are not continuous with each other, and the underlying printing surface is exposed. The ink is less likely to be absorbed by the printing surface, and the ejected ink is easily swayed and deformed by external force applied during the substrate transport process or hot air when the deposited ink is dried. The image quality may be deteriorated due to the fact that bleeding tends to occur during the application of the coating, and the design properties of the manufactured building material may be deteriorated. On the other hand, when the ejected ink dot diameter is larger than 100 μm, the overlapping portion of the ejected ink dots increases, and the image quality may deteriorate. The reason why the ink dot diameter becomes larger than 100 μm is considered to be the high ink absorbability of the printing surface. In such a case, the coloring concentration of the ink is low and the clear paint is applied. When the ink bleeds at the time, the design properties of the manufactured building material may be deteriorated. However, the degree of performance deterioration such as these deteriorations in designability is not such that the resulting designable building material becomes inoperable, and the practical design having performances such as the designability intended by the present invention. A characteristic building material can be obtained.

Here, the dot diameter of the ink refers to a numerical value measured by the following method. A printing surface forming paint is applied to the surface of a glass plate having a size of 70 mm × 150 mm so that the dry mass is 40 g / m ² . When the printing surface forming paint is a room temperature drying type, forced drying is performed at 80 ° C. for 10 minutes, and when the printing surface forming paint is a baking curing type, printing is performed at 160 ° C. for 20 minutes. Bake and dry. Then, it is left still for 3 days in an environment with a temperature of 23 ° C. and a humidity of 50%. After leaving still, under a temperature of 23 ° C. and a humidity of 50%, a water-based ink whose pigment content concentration is adjusted to 5.5% by mass is ejected as 17 pl as one dot by an ink jet printer. Ink dots are deposited on the coating film of the formed paint. After standing overnight in the same environment, the diameter of the deposited ink dots on the coating film of the printing surface forming paint is measured. Depending on the composition of the printing surface-forming paint, the ink dot diameter may vary in multiple measurements. In such a case, the measurement is performed on 10 ink dots and the average value is obtained. It is possible. Moreover, in this measurement, JP-0604 (Mimaki Co., Ltd. inkjet printer) was used for ink ejection, and VK-8510 (Keyence Co., Ltd. laser microscope) was used to measure the deposited ink dot diameter. It is possible to use.

  As a binder for the printing surface forming paint, it is possible to use a resin that has been used as a binder in the paint for building materials. Epoxy resin, vinyl resin, polyester resin, acrylic resin, urethane resin, fluororesin It is possible to use one kind or two or more kinds of silicon resins, acrylic silicon resins or their modified resins, or a combination of these with a curing agent, a curing catalyst, or the like.

  In addition, various fillers can be blended in the printing surface forming paint as necessary. These fillers include inorganic oxides such as titanium oxide, zinc oxide, zinc sulfide, carbon black, chrome lead, ocher, valve stem, and complex oxides (nickel / titanium, chromium / titanium, bismuth / vanadium). Commonly used for paints such as pigments and organic pigments such as phthalocyanine blue, carmine FB, Hansa yellow, quinacridone, diketopyrrolopyrrole, benzimidazolone, isoindolinone, anthrapyramidine, selenium, dioxazine For various organic or inorganic color pigments, talc, kaolin, barium sulfate, calcium carbonate, mica, silica powder, diatomaceous earth, amorphous silica, allophane, imogolite, bentonite, montmorillonite, sepiolite, etc. Commonly used extender pigments and porous inorganic powders Or polyacrylate copolymer, saponified vinyl acetate-acrylic acid ester copolymer, saponified vinyl acetate-maleic acid ester copolymer, isobutylene-maleic anhydride copolymer, cross-linked polyethylene oxide, etc. However, the present invention is not limited to these.

Further, in the present invention, for the purpose of improving the ink absorbability of the printing surface, the printing surface forming coating material is a porous material having a true specific gravity in the range of 0.7 to 2.0 g / cm ³ . It is preferable to blend hydrophilic resin particles. By blending such hydrophilic resin particles, it is possible to improve the ink absorbability of the printing surface and further improve the design of the building material. Examples of such hydrophilic resin particles include polyacrylate copolymers, and among these, it is particularly preferable to use particles having an internal cross-linked structure. With the internal cross-linking structure, the particles will not expand even when ink is absorbed, and the formed image will not be disturbed, thus suppressing the deterioration of the design of the building material. Typical examples of such particles include tuftic HU720PS and tuftic HU720E (manufactured by Toyobo Co., Ltd.). However, the degree of performance deterioration such as deterioration of designability due to being outside these ranges is not such that the resulting designable building material is not practical, and the performance of designability etc. to the extent intended by the present invention. It is possible to obtain a practical building material having a design.

  In addition, when mix | blending the said hydrophilic resin particle with respect to a printing surface forming coating material, it is preferable to mix | blend 1.5-20 volume% in solid content of a printing surface forming coating material, 2.0- More preferably, 15% by volume is blended. If the blending amount of the hydrophilic resin particles is less than 1.5% by volume, the effect of improving ink absorbability due to blending of the hydrophilic resin particles tends to be lowered. On the other hand, when the blending amount of the hydrophilic resin particles is more than 20% by volume, the production efficiency tends to decrease due to an increase in viscosity at the time of coating production, and the water resistance of the formed printing surface is reduced, so that Durability tends to decrease. However, the degree of such performance deterioration is not such that the resulting designable building material becomes unpractical, but a practical designable building material having the intended performance of the present invention can be obtained.

  As the solvent for the printing surface-forming paint, any of those usually used in paints can be used. For example, aromatic hydrocarbons such as toluene and xylene: ethyl acetate, butyl acetate and the like Acetic esters: Ketones such as methyl ethyl ketone and methyl isobutyl ketone: Alcohols such as isopropyl alcohol and butyl alcohol: Furthermore, one or more selected from various aliphatic hydrocarbons, glycol ethers, water, etc. It is possible to use a combination of

  Additives for printing surface-forming coatings include antifoaming agents, leveling agents, UV absorbers, film-forming aids, light stabilizers, antibacterial agents, crosslinking accelerators, dispersants, precipitation inhibitors, and wetness with ink solvents. Auxiliary agents can be blended as necessary, and the type and amount of additives can be changed appropriately according to the binder, color pigment, extender pigment, water-absorbing filler, solvent, etc. used. Can do.

The application amount of the printing surface-forming coating material is preferably 20 to 80 g / m ² , more preferably 30 to 60 g / m ² in terms of dry mass. If the coating amount is less than 20 g / m ² , the durability of the manufactured architectural building material may be lowered. However, the degree of the performance deterioration is not such that the resulting designable building material is not practical, and a practical designable building material having the intended performance of the present invention can be obtained. On the other hand, if the coating amount exceeds 80 g / m ² , the time required for drying after applying the printing surface forming paint becomes longer, and the printing surface forming paint is applied for the increase of the coating amount. The improvement in performance cannot be expected, and the cost tends to be disadvantageous.

  Any method that has been conventionally used for coating application can be used as the application method for the surface-forming coating. Air spray coating, airless spray coating, electrostatic coating, roll coater coating, flow coater Various methods such as painting and combinations thereof can be appropriately selected. In particular, when the surface of the substrate has irregularities, airless spray coating or electrostatic painting can be suitably used because of the ability to follow the irregular shape and adaptability of the coating speed. Depending on the composition of the printing surface-forming coating material, it is effective for forming a good printing surface that the surface temperature of the substrate immediately before coating is preheated to 30 to 70 ° C.

  In the present invention, ink jet printing is performed after the surface to be printed is formed. In this case, ink jet printing may be performed in a state in which the painted material for forming the surface to be printed is completely cured and dried. However, it is not always necessary to completely cure and dry the printing surface-forming coating material, and it is also possible to perform ink jet printing with the solvent evaporated to some extent. It should be noted that the conditions for curing or drying the printing surface-forming coating material can adopt any method such as room temperature drying, forced drying, baking drying or curing drying by irradiation with active energy rays, depending on the type of coating material. It is possible to select appropriately according to the composition.

  In the present invention, water-based ink containing substantially no resin is used for ink jet printing. This improves the durability and maintainability of the printer, improves the hygiene of the workplace, reduces the risk of fire, and has the effect of reducing the load on the environment. In addition, by slowing down the ink evaporation rate as much as possible, it prevents clogging of the ink discharge nozzles of the ink jet printer and the occurrence of stains around the nozzles, and the relationship with the coating film formed by the above-mentioned printing surface forming paint It is possible to print with good image quality.

  The ink contains a color pigment, water, a dispersant, and the like as main components, and an additive, a diluting solvent, an extender pigment, and the like can be blended as necessary.

  The water-based ink used in the present invention is required to contain substantially no binder, that is, a resin component. The image quality accuracy targeted in the present invention is, for example, in the range of 100 to 600 DPI. In order to realize printing with unprecedented high image quality in terms of printing in building material manufacturing, the ink discharge of an ink jet printer is used. It is necessary to inevitably reduce the diameter of the outlet. Here, DPI is an abbreviation for dot-per-inch, and is a unit representing the density of ejected ink dots formed per inch. Accordingly, if the ink contains a resin component, when the ink is dried at the ink discharge port, nozzle clogging occurs, and the manufacturing efficiency of the design building material is significantly impaired. In addition, when blending the components as listed below into the ink, if the resin component is inevitably mixed, the blending amount of the resin component is in the range of 5% by mass or less, more preferably 3% by mass or less with respect to the entire ink. It is preferable to keep it in the range. Within this range, the resin content is not substantially included.

  As the color pigment of the ink, any of known color pigments generally used in paints and inks can be used. However, inorganic pigments are mainly used because of the weather resistance and durability of the formed color and pattern. It is preferable to use it. Typical examples of inorganic pigments include carbon black, iron oxide, composite oxides (nickel / titanium series, chromium / titanium series, bismuth / vanadium series), titanium oxide, and the like, but are not limited thereto. It is not a thing. In addition to the above inorganic pigments, organic color pigments can also be blended. Typical examples of organic coloring pigments include quinacridone, diketoprolope, benzimidazolone, isoindolinone, anthrapyrimidine, phthalocyanine threne, dioxazine and the like. The color pigment is preferably blended in an amount of 0.5 to 15.0 parts by mass, more preferably 1.0 to 10.0 parts by mass in 100 parts by mass of the ink. When the amount exceeds 15.0 parts by mass, the ink viscosity increases and the ink is dried too quickly, which easily causes clogging in the nozzle portion of the ink jet printer used for printing, and the ink droplet printing surface. The coating accuracy tends to decrease. If the amount is less than 0.5 parts by mass, the pattern formed tends to be unclear because coloring is insufficient. Further, when an organic pigment is used as the coloring pigment of the ink, it is preferable to sufficiently consider light resistance and fading.

  The color pigment preferably has an average particle size of 20 to 400 nm, more preferably 25 to 300 nm. If the average particle size is less than 20 nm, problems such as a decrease in ink storage stability due to agglomeration of pigments, a decrease in print image quality, an increase in ink viscosity, and a decrease in light resistance of the print surface tend to occur. When the average particle diameter exceeds 400 nm, the ink discharge nozzles of the ink jet printer are likely to be clogged, and sometimes the precipitation of pigments tends to cause variations in the image quality. Printing tends to be difficult.

  The total amount of water and the hydrophilic solvent in the ink is preferably 70 to 92% by mass, more preferably 75 to 90% by mass with respect to the entire ink. Among these, it is preferable that it exists in the range of 45-70 mass% as a compounding quantity of water. When the blending amount of water is lower than 45% by mass, the ink viscosity increases and the ink ejection property is lowered, so that it tends to be difficult to obtain a high-quality design. On the other hand, if the blending amount of water is higher than 70% by mass, drying of ink around the ink discharge nozzle is promoted, and nozzle clogging and ink discharge accuracy tend to occur easily. As the hydrophilic solvent, any of the solvents usually used in ink can be suitably used. For example, alcohols, ethylene glycol and ethylene glycol derivatives, glycerin and glycerin derivatives, propylene glycol and propylene It is possible to use one or a combination of two or more selected from glycol derivatives and the like.

  However, the degree of performance reduction or production efficiency reduction due to out of the preferred range for the color pigment, water, and hydrophilic solvent of the above ink is not such that the resulting designable building material is not practical. A practical designable building material having the performance desired by the invention can be obtained with a good yield as desired by the present invention.

  Ink dispersants include carboxylic acid salts such as fatty acid salts and rosin acid salts, sulfate ester salts such as higher alcohol sulfate esters, higher alkyl ether sulfate ester salts, sulfated fatty acid ester salts, etc., and sulfonate salts such as alkylbenzene sulfonic acids. Anionic dispersants such as alkyl phosphates, ether phosphates, alkyl aryl ether phosphates, etc., and polyoxyethylene alkyls as ethers, such as salts, alkylnaphthalene sulfonates, paraffin sulfonates, etc. Ether, polyoxyalkyl allyl ether, polyoxyethylene polyoxypropylene glycol, etc., glycerol partial ester, sorbitan ester, etc. as esters, glycerol ester poxyethylene ether as ether esters, etc. Tellurium, sorbitan ester polyoxyethylene ethers, nitrogen-containing fatty acid alkanolamides, polyoxyethylene fatty acid amides and other nonionic dispersants, styrene-maleic anhydride copolymer salts, olefin-maleic anhydride copolymers 1 or 2 selected from anionic polymer dispersants such as salt salts, naphthalene sulfonate formalin condensate, and also nonionic polymer dispersants such as polyvinyl alcohol, polyoxyethylene ether ester copolymer, polyacrylamide Combinations of more than one species can be used. About the kind and addition amount of these dispersing agents, it is possible to use properly by the kind and content of a pigment, the kind and content of a diluent, etc. suitably.

  Further, as other additives for the ink, a conductivity adjusting agent, an antifoaming agent, a suspending agent, an ultraviolet absorber, a light stabilizer, a preservative, and the like can be used as necessary.

  Further, barium sulfate, calcium carbonate, or the like can be used as the extender pigment of the ink.

  Using the ink as described above, the entire surface to be printed is colored or patterned into a single color or a composite color partially different in hue. The pattern may be formed on the entire printing surface or part of the printing surface. Further, when the printing surface has irregularities, the concave and convex portions can be colored with different colors.

  In the present invention, an ink jet printer is used when ejecting ink. Any type of ink jet printer used for printing can be used. For more efficient printing of high-quality coloring and designs, specifically 100-600 DPI-quality coloring and patterns, continuous-type piezo drop-type ink jet printers or on-demand piezo drop-type ink jets A printer can be suitably used.

  Furthermore, the printer head is positioned above the substrate transport conveyor and has the required length in the conveyor width direction, rather than the printer head positioned above the substrate transport conveyor and reciprocating in the conveyor width direction to eject ink in a timely manner. From the viewpoint of high production speed, an ink jet printer having a line type printer head in which ink discharge nozzles are arranged is preferable.

  10-60 m / min is preferable and, as for the speed which conveys a base material with a conveyor, 20-50 m / min is more preferable. When the conveyance speed is slower than 10 m / min, the production efficiency of building materials is lowered, and as a result, the cost tends to increase. On the other hand, when the conveyance speed exceeds 60 m / min, the image quality of the printed pattern tends to deteriorate.

  In addition, the gap between the surface of the substrate in the process of being conveyed by the conveyor (the apex of the convex portion if the surface has an uneven shape) and the ink discharge nozzle array surface of the printer head ( The distance) is preferably in the range of 4 to 12 mm, and more preferably in the range of 5 to 10 mm. If the gap is smaller than 4 mm, the upper surface of the substrate in the conveyance process may come into contact with or collide with the surface of the ink discharge nozzle due to vibration or thickness variation of the substrate, causing damage to the ink discharge nozzle. There is a case. On the other hand, if the gap is larger than 12 mm, the accuracy of the ejection position of ejected ink droplets on the printing surface is lowered, and it tends to be difficult to obtain a high-quality image.

  In addition, individual inks for each of the four primary colors, including the red (red), yellow (yellow), and blue (blue) primary colors plus the black (black) color for brightness adjustment. Use a full-color inkjet printer with a printer head that can handle the above, or more preferably a more advanced full-color inkjet printer with 4 to 8 groups of printer heads that can individually support the four primary colors and white inks as needed it can.

  When the pattern of 100 to 600 DPI is formed, the diameter of the ink discharge nozzle of the ink jet printer is preferably 10 to 45 μm, and more preferably 15 to 35 μm. If the nozzle diameter is larger than 45 μm, it tends to be difficult to obtain high-resolution coloring or patterns. If the nozzle diameter is smaller than 10 μm, nozzle clogging and the like tend to occur frequently. It is preferable from the viewpoint of production efficiency and image quality that a plurality of nozzles are provided in the width direction of the conveyor. Moreover, it is preferable that the pitch between nozzles is 10-200 micrometers, and it is still more preferable that it is 15-150 micrometers. When the pitch between nozzles is smaller than 10 μm, not only the number of nozzles required for the printing width becomes enormous, but also the capacity required for the control system tends to increase, which tends to be economically disadvantageous. On the other hand, if the pitch between nozzles is larger than 200 μm, the distance between printed ink dots becomes too large, and the image quality tends to be lowered.

  In the present invention, by adopting the method as described above, it is possible to produce a high-resolution colored or patterned design building material of 100 to 600 DPI. In addition, when manufacturing at an appropriate production cost, it is effective to keep the resolution within the range of 180 to 360 DPI. Moreover, when coloring the surface of the designable building material into a single color, it is effective to keep the resolution in the range of 100 to 360 DPI. In addition, the resolution is generally set to the same number of pixels in both the horizontal axis direction and the vertical axis direction. However, in the case of a line type printer, the width direction of the printer head is set to a high resolution, for example, 600 DPI. For example, by setting the resolution to slightly lower in the transport direction, for example, 300 DPI, the linear shape that occurs in the building material transport direction due to the clogging of specific nozzles or the flying bending of ink droplets without decreasing the production speed. It is also possible to reduce the uneven coloring. The resolution can be changed as appropriate by adjusting the nozzle diameter, the frequency of the piezoelectric element, and the like. The frequency of the piezo element can be controlled by a voltage supplied to the piezo element.

  However, the degree of performance reduction or reduction in production efficiency due to out of various suitable ranges for the above-described ink jet printing is not such that the resulting designable building material is not practical, and is the extent intended by the present invention. A practical designable building material having performance can be obtained with a good yield as intended by the present invention.

  When coloring and / or patterning is performed by inkjet printing, heating is performed until the surface temperature of the printing surface formed on the substrate by the above-described process is 35 to 80 ° C, more preferably 45 to 65 ° C. In addition, it is preferable to deposit ink on the surface to be printed whose temperature has been raised to the temperature. By causing the ink to be deposited on the printing surface in the temperature range, the evaporation of the solvent in the deposited ink is promoted, and the design of the building material is reduced due to ink bleeding when the clear paint is applied in the next step. It becomes possible to prevent. When the temperature of the printing surface is lower than 35 ° C., the evaporation effect of the ink solvent is low, and ink bleeding tends to occur when applying the clear paint. On the other hand, if the temperature of the printing surface is higher than 80 ° C., depending on the type of base material, thermal deformation such as warpage occurs in the base material, the gap between the ink discharge nozzle and the base material surface becomes small, and the base material It tends to cause nozzle breakage due to contact with the nozzle. Furthermore, drying of the ink at the nozzle opening is promoted by heating the nozzle array surface based on the excessive energy cost required for heating and the high surface temperature of the building material that passes continuously under the printer head. There is a tendency that ink ejection defects and image quality degradation are likely to occur due to nozzle clogging.

  In order to bring the temperature of the printing surface into the above temperature range, it is possible to use the temperature rise by heating in the process of applying the printing surface forming paint to the substrate surface and drying it. In addition, when cooling once after the process of applying and drying the printing surface forming paint, the temperature of the printing surface is adjusted within the above temperature range by performing appropriate reheating at the start of subsequent inkjet printing. Is possible.

  The clear paint is applied after the above-described ink jet printing is performed. In this case, the amount of the solvent of the water-based ink deposited on the surface to be printed is set to 20 to 85 on the basis of the evaporation immediately after the deposition. It is preferable to apply the clear paint in a state where the mass is reduced, more preferably in a state where the mass is reduced by 25 to 80 mass%. If the clear paint is applied in a state where the amount of solvent decrease is less than 20% by mass, the ink bleeds or the substrate having an uneven shape on the surface discharges as the clear paint flows into the recess immediately after painting. The ink that arrives also moves non-uniformly, resulting in a decrease in image quality, which tends to deteriorate the design of the building material. On the other hand, in order to increase the solvent reduction amount to more than 85% by mass, it is necessary to carefully perform heating and the like to evaporate the solvent, which not only reduces the manufacturing efficiency of the design building material, but also for drying. The energy cost required tends to increase. However, this degree of decrease in production efficiency is obtained by a practical designable building material having the performance of the object of the present invention with a good yield of the object of the present invention. The amount of ink solvent decrease may vary depending on the ink composition and drying conditions (temperature, time, etc.), but can be adjusted to the required conditions by performing the following measurements in advance.

The mass of the aluminum foil cut to a size of 15 cm × 15 cm is measured. Ink is deposited on the surface of the aluminum foil by an ink jet printer, and the mass of the aluminum foil after ink deposition is measured, which is defined as the initial mass. In addition, more accurate measurement is possible by adjusting the ink discharge amount to be in the range of 17 × 10 ^{7 to} 20 × 10 ⁷ pl in total for all ink discharge nozzles of the ink jet printer used. It becomes. Next, the aluminum foil on which the ink has been deposited is allowed to stand at room temperature, or is dried at a desired time and at a desired temperature, and the mass of the aluminum foil thereafter is measured, which is defined as the mass after drying. Using the measured values, the following calculation formula:
Solvent reduction rate (% by mass) =
100 × (initial mass−mass after drying) /
[(Initial mass−mass of aluminum foil) × solvent content of ink]
Calculate the amount of solvent reduction (solvent reduction rate) under the dry conditions.

Searching for a combination of ink composition and drying conditions such that the amount of solvent reduction obtained by the above calculation is in the range of 20 to 85% by mass, and using the searched combination, the substrate after ink ejection Dry. The above calculation formula shows a case where the ink is a single color. For example, when printing is performed in full color using four colors of black, red, blue and yellow, the above 4 After the four colors of ink are deposited on the entire surface of the aluminum foil using a color ink and the aluminum surface is colored with a single color of four colors, the amount of ink solvent decreased is measured by the above method. It is preferable to search for a combination of an ink composition and a drying condition such that the amount of solvent decrease is in the range of 20 to 85% by mass. In such a case, the above formula is
Solvent reduction rate (% by mass) =
100 × (initial mass−mass after drying) / [A ×
(Discharge rate of black ink x solvent content of black ink
+ Red ink discharge rate x Red ink solvent content
+ Blue ink discharge rate x Blue ink solvent content
+ Yellow ink discharge rate x Yellow ink solvent content)]
Here, A = (initial mass−mass of aluminum foil)
By doing so, it is possible to calculate the amount of solvent decrease (solvent reduction rate) under the dry conditions. In addition, the discharge amount of each color ink can be calculated by the total number of dots of ink discharge of each color ink × 1 dot ink capacity on an aluminum foil having a size of 15 × 15 cm. Here, the total number of dots of each color ink for an aluminum foil having a size of 15 × 15 cm is set by a computer that controls the ink jet printer. DropSim (Coventor) can be used to measure the ink capacity per dot. It should be noted that the ink droplets of each color are ejected so as to be uniformly scattered on the aluminum foil having a size of 15 × 15 cm without being biased.

  In addition, along with the measurement of the ink solvent reduction amount using the aluminum foil as described above, it is possible to confirm ink bleeding or the like when applying the clear paint after inkjet printing. In other words, an aluminum foil for measurement is placed on a substrate (actual substrate) equivalent to an actual production substrate whose surface of the printing surface immediately before performing inkjet printing with an inkjet printer is controlled within a specified temperature range. Temporary sticking is temporarily performed, ink is ejected to the entire actual base material with an ink jet printer, and the ink drying process is similarly advanced with the real base material and the aluminum foil. Measure the amount of decrease in ink solvent while peeling off and re-sticking, and use the actual base material to observe and evaluate ink bleeding and uneven ink movement after applying clear paint. it can.

  As the clear paint used in the present invention, any clear paint that has been conventionally applied to building materials can be used. The clear paint comprises a binder and, if necessary, a pigment, an additive, a solvent, and a filler.

  As a binder for clear paint, one or a combination of two or more selected from acrylic resins, urethane resins, fluororesins, silicone resins, acrylic silicone resins, vinyl resins, cellulose derivatives, etc., and curing agents, or A combination of these and a curing accelerating catalyst can be used.

  The pigment can be used to such an extent that the transparency of the clear paint is not lost. These pigments include extender pigments, color pigments, or colored or transparent beads such as color mica, urethane and acrylic, scaly graphite, scaly iron oxide, plated glass flakes, aluminum foil color clear Various pigments such as paint cutting products can be used.

  In the clear paint, an additive can be further blended as necessary. Examples of the additive include a dispersant, a suspending agent, a surface modifier, an ultraviolet absorber, and a surfactant. These components are preferably used within a range of 0.1 to 10 parts by mass with respect to 100 parts by mass of the solid content of the binder.

  As the solvent for the clear paint, any of those usually used in paint can be used. For example, aromatic hydrocarbons such as toluene and xylene: acetates such as ethyl acetate and butyl acetate : Ketones such as methyl ethyl ketone and methyl isobutyl ketone: Alcohols such as isopropyl alcohol and butyl alcohol: Furthermore, one or a combination of two or more selected from various aliphatic hydrocarbons, glycol ethers, water, etc. It is possible to use.

  However, depending on the composition of the printing surface forming paint and the ink used, the ink may be re-dissolved by applying the clear paint and bleeding may occur in the formed image. In order to prevent this, it is preferable to use a solvent having a solubility parameter (hereinafter referred to as “SP value”) in the range of 7 to 23.4 as all the solvents blended in the clear paint. Is more preferably in the range of 7-22, and still more preferably in the range of SP-20. When the SP value of the solvent is lower than 7, precipitation of the soluble component blended in the clear paint occurs, and it tends to be difficult to obtain a smooth coating film. In addition, a solvent having an SP value of less than 7 generally has a high evaporation rate, and when mixed in a large amount with a clear paint, there is a tendency that a problem that it is difficult to obtain a smooth coating film tends to occur. On the other hand, if the SP value is higher than 23.4, the ink on the surface to be printed tends to bleed and it becomes difficult to form a clear design. The SP value is a numerical value when a clear paint is applied. Accordingly, even a clear paint that does not fall within the range of the SP value at the time of manufacturing the clear paint falls within the range of the SP value as a result of dilution with a solvent at the time of painting. It is. In addition, the solvent used may be a single solvent or a combination of two or more solvents provided that it falls within the above SP value range. In addition, it is preferable that 45-85 mass% is mix | blended with the solvent which exists in the range of the said SP value in a clear coating material, and it is still more preferable that 60-80 mass% is mix | blended. When the blending amount of the solvent is less than 45% by mass, the viscosity of the coating is increased, and it is difficult to obtain a uniform continuous film during the coating operation, and the production efficiency of the coating tends to be lowered. On the other hand, when the amount of the solvent is more than 85% by mass, the ink bleeding tends to be more prominent.

  The clear paint is applied after ink is deposited on the surface to be printed as described above and dried under the above drying conditions. By applying the clear paint, the formed image can be protected over a long period of time.

The coating amount of the clear paint, on a dry weight, preferably in the range of 15 to 80 g / ^{m 2,} the range of 20~65g / ^{m 2} is more preferable. If the coating amount exceeds 80 g / m ² , ink bleeding tends to occur when the solvent of the ink is not sufficiently evaporated, and the coating surface tends to be blocked due to poor drying. . When the coating amount is less than 15 g / m ² , the durability of the design building material and the protection of the printed pattern tend to be lowered.

  However, the degree of performance degradation or production efficiency degradation due to out of the preferred range for the clear paint and its application is not such that the resulting design building material is not practical, and is an object of the present invention. A practical designable building material having a degree of performance can be obtained with a good yield that is the object of the present invention.

  Any of the commonly used coating methods can be used as the method of applying the clear paint. Air spray coating, airless spray coating, electrostatic coating, roll coater coating, flow coater coating, etc. are used as appropriate. It is possible to select. In particular, in the case of a substrate having irregularities on the surface, airless spray coating or electrostatic coating can be suitably used from the viewpoint of followability to the substrate shape and coating processing speed.

  After applying the clear paint, the paint is dried or cured. Drying conditions can be any of room temperature drying, forced drying, baking drying, or curing by irradiation with active energy rays depending on the type of coating material, and can be appropriately selected depending on the coating composition used. In addition, when the coating material to be used is a water-based coating material, it is effective in forming a good coating film that the surface temperature of the ink discharge base material immediately before coating is 30 to 70 ° C. .

  In the present invention, the designable building material obtained as described above can be further colored or patterned by known flexographic printing, gravure offset printing, silk screen printing, or the like, if desired. Such coloring or patterning may be formed so as to overlap with the coloring or patterning region formed by ink jet printing, but can also be formed in a region different from that region.

  Hereinafter, the present invention will be described in more detail based on examples. Needless to say, the contents of the following examples do not limit the scope of the present invention.

[Examples 1-4 and Comparative Examples 1-2]
Sealer Preparation Sealer: V Seran # 105M Sealer (Dainippon Paint Co., Ltd.)
Contents Polyurethane solvent dilution type sealer Heating residue: 66.0%, p. w. c. : 51.0%
p. w. c. = [Pigment weight content / (pigment weight content + resin weight content)] × 100
Preparation of printing surface-forming paint Olestar Q164 (acrylic resin, manufactured by Mitsui Chemicals, molecular weight 23,000, heating residue 45%, specific gravity 0.95) 26.5 parts by mass, vinylite VAGH (vinyl copolymer, union carbide) Made by the company, molecular weight 27,000, heating residue> 99%, specific gravity 1.39) 3.0 parts by mass, titanium oxide (specific gravity 4.0) 8.5 parts by mass, tuftic HU720PS (crosslinked sodium polyacrylate) Particles, manufactured by Toyobo Co., Ltd., average particle size 50 μm, specific gravity 1.05) 4 parts by mass [7.2% by volume in solids] talc (specific gravity 2.6) 10.0 parts by mass, diatomaceous earth (specific gravity 2.6) 13.0 parts by mass, 29.7 parts by mass of an organic solvent (a mixed solvent of butyl acetate: xylene = 1: 1) are used as a main agent, and coronate HX (isocyanurate, manufactured by Nippon Polyurethane Industry Co., Ltd. Residue 99%, as a curing agent specific gravity 1.15) 5.3 parts by weight, was prepared. In addition, when the water absorption amount of the printing surface produced by applying this paint was measured by the measurement method, it was 3.7 g / m ² . The diameter of the deposited ink dots was measured when one dot of water-based ink having a pigment content concentration of 5.5% by mass and a volume of 17 pl was deposited on the printing surface produced by applying this paint. Black ink 85 μm, red ink 65 μm, yellow ink 66 μm, and blue ink 66 μm.
Preparation of Ink Each color ink was prepared by using a media mill and kneading with the formulation shown in Table 1 below until the particle diameter of the contained pigment became 100 nm. In all the tables below, the amount is expressed in parts by mass.

クリアー塗料の調製
以下の表２に示す配合にて、ディスパー混合することにより、クリアー塗料を作製した。

Preparation of clear paint A clear paint was prepared by mixing with a disper according to the formulation shown in Table 2 below.

上記のシーラー、被印刷面形成塗料、インク及びクリアー塗料を用いて意匠性建材の製造を行った。

A designable building material was manufactured using the above sealer, printing surface forming paint, ink, and clear paint.

As a base material, a gypsum slag perlite plate (surface shape: small stucco pattern having unevenness of 6 mm) was used, and the dimensions were set to actual product sizes (width 455 × length 3030 × thickness 16 mm) in accordance with actual production. . The above-mentioned sealer was adjusted in viscosity (adjusted to 9 seconds with Ford Cup # 4), and applied to the surface of the above-mentioned substrate by air spray so that the dry mass was 28 g / m ² . This sealer dry film had a water absorption of 1.0 g / m ² . After the sealer coating, drying was performed at 120 ° C. for 5 minutes, and the surface temperature of the substrate was cooled to 20 ° C.

Next, the above-mentioned printing surface forming paint was applied to the surface of the base material coated with sealer. The printing surface-forming coating material was adjusted in viscosity (13 seconds with Ford Cup # 4) and was applied by airless spraying so that the dry mass was 38 g / m ² .

  Next, after the printing surface forming paint is dried under each condition, when the surface of the formed printing surface reaches a predetermined temperature, the curing state of the coating film of the printing surface forming paint and the nozzle arrangement surface The passability of the lower set gap (distance) was evaluated. In addition, for confirmation of ink bleed, an aluminum foil with a known weight of 15 × 15 cm is temporarily temporarily attached to a part of the surface of the substrate, and each of the color inks is immediately ejected by an ink jet printer to be colored in a single color on the entire surface. Went. The substrate conveyance speed was 40 m / min. The discharge rate of each color ink was black ink 25%, red ink 25%, yellow ink 25%, and blue ink 25%, and was a uniform discharge rate.

  The inkjet printer used was a piezo inkjet printer (GP-604: full color inkjet printer manufactured by Mimaki). Then, after removing the aluminum foil and measuring the weight of the deposited ink, it was immediately temporarily attached again to the original position on the surface of the substrate and dried under each drying condition of the ink. The aluminum foil was removed again and evaporated. The reduction amount of the ink solvent due to was measured.

On the other hand, the clear paint was applied to the substrate. The clear paint was subjected to viscosity adjustment (12 seconds with Ford Cup # 4), and was applied by airless spraying to a dry mass of 32 g / m ² . A designable building material was obtained by drying at 120 ° C. for 15 minutes after coating. Table 3 shows conditions for securing the surface temperature of the printing surface, drying conditions for the deposited ink, and evaluation results of the design building material.

  The surface temperature of the printing surface immediately before ink ejection was measured with an infrared sensing thermometer SK-8700 (manufactured by Sato Keiki Seisakusho Co., Ltd.). The amount of decrease due to evaporation of the ink solvent was measured by the above method.

In addition, the evaluation criteria for each item were as follows:
Curing situation of the coating film of the printing surface forming paint: The fingertip was strongly pressed or slid on the printing surface, and the degree of curing was judged by touch as follows:
○: Curing is sufficient Δ: Slightly insufficient curing x: Insufficient curing Completely passing through the gap between the nozzle array surface and the bottom surface of the normal substrate without deformation and the bottom surface of the nozzle array The gap (distance) was set to 10 mm, and the substrate having the printing surface adjusted to each surface temperature could pass through the gap without contacting or colliding with the lower surface of the nozzle array. Was determined as follows:
○: There is no deformation or slight change, and there is no hindrance to passage. △: Deformation is slightly large, but barely passes. X: Deformation is large and cannot pass. Design property: Design property of the obtained design building material. Visually determined as follows:
○: There is no ink bleed and a clear pattern is formed. △: There is a slight bleed, but the pattern is formed to the extent that there is no practical problem. X: The ink bleeds and the pattern is clear. Not formed.

[Examples 5 to 8 and Comparative Examples 3 to 4]
A printing surface-forming paint was prepared with the formulation shown in Table 4 below. In Production Example 1, the amount of tuftic HU720PS was 7.2% by volume in the solid content. Viscosity adjustment (Ford cup # 4 for 13 seconds) is applied to each prepared printing surface forming paint, and it is applied to a glass plate (dimension 70 × 150 mm) by airless spraying so that each has a dry mass of 40 g / m ^2. In the case where the printing surface forming coating material is of a room temperature drying type (heating at 80 ° C. for 10 minutes), the discharged ink dot diameter was measured. As the ink, those shown in Table 5 below were used, and as the ink jet printer, a full color ink jet printer GP-604 manufactured by Mimaki Co., Ltd. was used. In addition, a straight line having a length of 50 mm was drawn at 400 DPI to evaluate the image quality. The evaluation results are shown in Table 6.

The image quality was evaluated visually, and the evaluation criteria were as follows:
○: A clear line is formed and the coloring density is sufficiently high. Δ: A clear line is formed, but the coloring density is light. X: The dots are not fixed and are unclear.

以上の結果の通り、本発明の範囲内である実施例１〜４においては、意匠性等に優れた建材を製造することが可能である。これに対し、本発明の範囲外である比較例１〜２においては、インクのにじみによる意匠性の低下、もしくは基材の反りが発生することによる印刷効率の低下が確認できる。

As described above, in Examples 1 to 4 that are within the scope of the present invention, it is possible to manufacture a building material excellent in design and the like. On the other hand, in Comparative Examples 1 and 2 that are outside the scope of the present invention, it is possible to confirm a decrease in design properties due to ink bleeding or a decrease in printing efficiency due to the occurrence of warping of the substrate.

  Further, in Examples 5 to 8 in which the ejected ink dot diameter is within the predetermined range, it is possible to print with good image quality. On the other hand, in Comparative Examples 3 to 4 in which the discharge ink dot diameter is smaller than or larger than the specified range, it is possible to confirm the deterioration of the image quality.

Claims (5)

A method for producing a designable building material by applying a clear paint after inkjet printing,
Apply the printing surface forming paint on the surface of the substrate to form the printing surface,
While the temperature of the printing surface is maintained at 35 to 80 ° C., ink-jet printing is performed on the printing surface using a water-based ink that does not substantially contain a resin component, and the water-based ink dots are formed on the printing surface. And then
The surface to be printed on which the inkjet printing has been performed is dried, and the amount of the solvent in the water-based ink dots deposited on the surface to be printed is reduced by 20% by mass or more based on immediately after the ink dots are deposited.
A method for producing a designable building material, comprising applying a clear paint to the dried printing surface. The printed surface-forming coating material contains porous hydrophilic resin particles, and the hydrophilic resin particles have a true specific gravity in the range of 0.7 to 2.0 g / cm ³ , The manufacturing method of the designable building material of Claim 1. The printed surface forming paint has a water absorption of 2.0 to 10.0 g / m ^{2 on} the printed surface formed by using the printed surface forming paint. The manufacturing method of the designable building material of crab.   The printed surface forming paint is deposited on the printed surface formed using the printed surface ink when 1 dot of the water-based ink having a pigment-containing concentration of 5.5% by mass and a volume of 17 pl is deposited. The method for producing a designable building material according to any one of claims 1 to 3, wherein the diameter is in a range of 60 to 100 µm.   The clear paint comprises a binder and a solvent having a solubility parameter of 7 to 23.4, and the solvent is blended in an amount of 45 to 85% by mass. The manufacturing method of the designable building material in any one of.