JPS6351081B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing a decorative board having an uneven pattern and a transferred pattern on its surface, and more specifically, a method of manufacturing a decorative board having a pattern of irregularities and a transferred pattern on its surface, and more specifically, a method of filling a slurry of a hydration hardening material in contact with the patterned surface of a transfer sheet that may or may not be formed into a desired shape. In the manufacturing method of a transfer decorative board, which is manufactured by curing the slurry and removing it from the mold, in addition to the transfer pattern that can be transferred with the moisture in the slurry, an ink containing a water-absorbing resin that swells when it absorbs water is used. The present invention relates to a method for manufacturing a decorative board, which uses a transfer sheet partially provided with layers. Conventionally, for surface decoration of inorganic materials such as gypsum boards and cement boards, painting methods include laminating decorative sheets during and after molding the base material, hot-pressing thermosetting resin-impregnated paper after molding, Direct printing using gravure, offset, silk screen, etc., thermal transfer using thermal transfer paper, and water transfer, which is common for ceramics, etc., are available.For forming irregularities on the surface, shapes can be given using casting mold sheets, and molding can be used. Applications included coating, laminating, etc., with materials for forming irregularities on surfaces that were later mechanically processed, such as cutting. Each of these methods has its own characteristics; for example, when laminating decorative sheets, a method in which this is done simultaneously with base material molding is already commonly used in the production of so-called decorative gypsum boards; Although it does not require any treatment such as surface decoration and has the advantage of simultaneous molding, there are limitations due to the molding method and conditions, such as the inability to use decorative sheets with low moisture permeability, and the ability to withstand drying temperatures. There are significant restrictions on the physical properties of decorative sheets, such as the requirement for heat resistance, and the selectivity of sheet materials is extremely limited, making it extremely difficult to industrially obtain products with excellent design and physical properties. . In addition, as a so-called secondary processing method that performs surface decoration after molding the base material, there is also the lamination method of decorative sheets, but as a general feature of the lamination method, the base material and the dissimilar surface material are bonded together. Since the compatibility of the surface material with the base material is mainly determined by the adhesive and the bonding method, there is a wide range of surface materials to choose from, and once the adhesive is selected, any surface material can be used. It has the advantage that it can be used. However, when actually manufacturing with this method, in addition to selecting the adhesive, it is often necessary to sand the base material, apply a sealer, etc. to smooth it, and the physical properties of the adhesive layer may be affected by alkaline water, etc. However, not only is there an unavoidable risk of deterioration over time, but the use of inorganic film sheets such as paper and plastic as the surface material causes defects such as differences in surface material texture and worsening of combustibility. It is inevitable that it will occur. The secondary processing method of hot-pressure molding of thermosetting resin-impregnated paper is also used for surface decoration of inorganic boards, and inorganic decorative boards are manufactured by taking advantage of the excellent surface properties of the surface of the thermosetting resin hardened layer that is laminated and integrated. has been done. However, this method not only has problems with surface preparation, but also requires equipment for hot-pressure molding, and since continuous molding is difficult, the process is intermittent, resulting in low productivity and poor heat resistance of the base material.・There are also major restrictions on the base material due to production conditions, such as pressure resistance being required. Surface decoration by direct printing is the simplest method in principle, but there are many problems when applying it to inorganic substrates, such as printability, continuity, multicolor overprinting, and ink resistance. In practice, it is difficult to obtain any desired design. In other words, not only is it necessary to perform surface treatment to improve printability, the selection of binders and pigments that are resistant to alkalis from the base material, or a sealer treatment process, but also continuous printing is required in the case of hard plates. Since this is impossible, sheet-fed printing has to be used, and since it is difficult to efficiently perform multicolor printing in registration using this method, there are significant restrictions in terms of pattern and design. Transfer painting has many advantages over direct printing. In other words, since it is possible to efficiently print any multicolor pattern continuously and in register, and it is also possible to store it in the form of transfer paper, the production lot can be increased. Since printing losses can be stopped at the transfer paper stage without turning them into production losses, it is possible to reduce the overall loss rate. however,
In transfer painting as a secondary process performed after forming the base material, in the case of thermal transfer, ground treatment,
There are problems such as the heat resistance of the transfer equipment and the base material, and even in the case of water transfer, water resistance of the base material is required, and problems such as low productivity are unavoidable. As a method of forming irregularities on a surface, giving a shape using a casting mold is an excellent method for reproducing the shape of a complex surface, but there are problems with the productivity of the molding process of the mold material or sheet, handling when the mold becomes large, and dimensions. Disadvantages such as difficulty in accuracy and difficulty in synchronizing when combined with a pattern cannot be avoided. In addition, regarding the cutting process after molding, there are problems in synchronization with the pattern and processing accuracy, as well as the inability to efficiently handle complex shapes, and this method is not suitable for mass production processes. Apart from these methods, there is also a method of laminating a surface material that has already been formed with unevenness on the surface without forming unevenness on the base material, or a method of forming unevenness after coating and laminating a different material on the surface, but the basic method is In other words, it is a different concept from the uneven molding of the base material, and the thickness of the surface material is required in order to obtain a sufficient unevenness expression effect, so the cost and combustibility are similar to the lamination method for painting. There is no choice but to be at a disadvantage in terms of As described above, in the conventional method, it is difficult to perform the molding process of the base material and the process of painting the surface at the same time, and to form an uneven pattern on the surface. As a result of intensive studies in view of these points, the present inventors have found that by combining a hydrated curing material slurry with a transfer paper printed with an ink containing a water-absorbing resin as one component, it is possible to form a base material. We have discovered a method for efficiently producing decorative decorative boards with uneven surfaces by simultaneously transferring patterns and forming unevenness on the surface. That is, as described in the claims, the present invention uses a transfer sheet in which an ink layer containing a water-absorbing resin is provided separately from the transferred pattern during molding of a slurry of a hydration hardening material, and the molding and unevenness are It provides a basic method for performing formation and pattern transfer in the same process, and various methods for reinforcing and stabilizing its effects. Hereinafter, the method of the present invention will be explained in detail based on drawings and examples. 1 to 6 are schematic cross-sectional views of the process and product of the present invention. The transfer sheet shown in FIG. 1 basically consists of a base sheet 3, a transfer pattern layer 2, and an ink layer 1 containing a water-absorbing resin. Figure 2 shows the state immediately after casting so that the two are in contact with each other. Figure 3 shows that when the slurry 4 of the hydrated hardening material hardens to become the hydrated hardened material 4', the water-absorbing resin simultaneously absorbs water and swells, becoming the state of the water-absorbing resin layer 1'. . The state immediately after peeling off the transfer sheet from the state shown in Figure 3 is
4a, 5a, and 6a, and the dried state of each is shown in FIG. 4b, 5b, and 6b. In each of these states, FIG. 4 shows that at the time of peeling, the water-absorbing resin layer 1' has partially or completely transferred to the surface of the cured hydration hardening material 4', and that the water-absorbing resin layer 1' of the transferred pattern layer 2 is partially or completely transferred to the surface of the cured material 4'. Only the unapplied portions of the ink layer 1 containing the ink layer 1 are transferred. In FIG. 5, all of the water absorbent resin layer 1' remains on the transfer sheet side,
This shows a state in which the surface of the hydrated cured product 4' in contact with the ink layer 1 containing a water-absorbing resin is exposed. Furthermore, the sixth
The figure shows that all of the ink layer 1 containing a water-absorbing resin and the transfer pattern layer 2 have been transferred to the surface of the hydrated cured product 4', and that recesses are formed only after drying. . Each of these states can be easily and stably selected and controlled by the method described later in the text. In this way, the method of the present invention uses a substantially planar sheet that is easy to handle, without giving the transfer sheet an uneven shape on the surface of the product before molding by mechanical embossing or foaming, etc.
It enables the efficiency of the number of steps, storage of transfer sheets, and casting process. By simultaneously forming unevenness on the surface of the hydrated cured product and transferring the pattern, the process can be simplified and the pattern and unevenness can be easily created. The present invention provides a novel method that not only enables synchronization but also provides a wide variety of design expression effects, including the condition of the recesses ranging from smooth to rough surfaces, and the presence or absence of transferred patterns. Furthermore, according to the method of the present invention, since the ink layer containing the water-absorbing resin is applied separately from the transferable pattern layer, the water absorption swelling of the water-absorbing resin is not affected by the transferable pattern layer. Therefore, it has a feature that the transferable pattern layer has very little selectivity in terms of water permeability, etc. Materials and methods that can be used in the present invention are described below, but the present invention is not limited to the materials and methods described in the following description and examples, and any materials that do not depart from the spirit of the present invention can be used.・Includes method development. The essential components of an ink composition containing a water-absorbing resin include a water-absorbing resin and a binder for fixing the water-absorbing resin to a transfer sheet. Furthermore, when applying these by a normal printing method, appropriate ink fluidity and Liquid components such as solvents may be used to provide drying properties. As water-absorbing resins, partially cross-linked synthetic water-soluble polymers and partially cross-linked natural water-soluble polymers are on the market, and both have a pure water absorption capacity that is several hundred to 1,000 times higher. Moreover, it has the characteristic that it dissolves upon absorption of water and swells in a gel state without exhibiting significant fluidity. In the present invention,
The water-absorbing resin only needs to have the function of imparting a concave shape to the surface of the hydrated and cured product through water absorption and swelling. Therefore, it can be used regardless of the manufacturing method or structure of the water-absorbing resin. Examples include partially crosslinked sodium acrylate, partially crosslinked isobutene-maleic anhydride copolymer, and partially crosslinked starch. In relation to the shape of the concave part, the smaller the particle size, the smoother it is, but for applications where a rough surface is desired, such as tile pattern or brick pattern joint pattern, the particle size is larger than 150 mesh. ingredients
By using a material containing 10% by weight or more, it is possible to obtain a product that has an excellent real-life feel as well as an uneven feel compared to the smoothness of the convex portions. There are no particular limitations on the method of forming the layer containing the water-absorbent resin, and any method such as printing, sprinkling after printing with adhesive, pasting of a pattern sheet, etc. can be used; A printing method such as gravure screen is suitable for this, and screen printing is particularly suitable when increasing the amount of coating and increasing the depth of the recess. When applying a composition containing a water-absorbing resin using a normal printing method, selection of the binder and solvent is important. The binder may be anything that fixes the water-absorbing resin onto the transfer sheet and is soluble in a solvent, such as polyvinyl chloride, polyvinyl chloride/polyvinyl acetate copolymer, polyacrylic ester, Resins such as ethylene vinyl acetate copolymer, nitrocellulose, and acetylcellulose can be used. Also, almost all solvents except water can be used on the condition that they dissolve the binder, but both the methods shown in Figures 4 and 5 prevent the transfer of the transferred pattern layer, and the methods shown in Figures 5 and 5 have a negative effect on the transfer prevention effect. The solvents that can be used are different from the method shown in Figure 6. In the former method, the solvent system is required to have sufficient permeability to the transferred pattern layer and solubility to provide adhesion to the base sheet when the transferred pattern layer and water-absorbing resin are peeled off. Specifically, as shown in the examples, a combination such as a ketone solvent for the PVC base sheet is required. This selection is based on solubility in the base sheet, so it naturally varies depending on the type of base sheet, but typical combinations include methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone for vinyl chloride/acrylic base sheets. , ketone solvents such as isophorone, and ether solvents such as tetrahydrofuran. For the latter method, it is necessary not to affect the pattern transfer, and the conditions for this are not only to select a solvent that has no or little solubility in the base sheet, but also to It is also necessary that there be no significant impact. Of course, solvents that do not have solubility in the base sheet are determined by the relationship with the base sheet, but in reality, materials with high solvent resistance such as polyolefin sheets such as polypropylene and polyethylene are used as the base sheet. It is desirable to choose
In relation to the transfer pattern layer, it is a good rule of thumb to choose a solvent that does not have significant solubility, but if you use a solvent that has a short volatilization time, there will be relatively few problems. If a polyolefin-based base sheet is used, almost all organic solvents that do not contain water, such as ketone-based, ester-based, ether-based, and hydrocarbon-based solvents, can be used. Regarding the base sheet and the pattern transfer layer, other than the relationship with the water-absorbing resin mentioned above, the required conditions are usually printability and transferability, and when molding is performed, the moldability of the sheet However, since it has no direct relation to the gist of the present invention, it will be briefly described. The base sheet may be a normal thermoplastic sheet or film such as polyvinyl chloride, polyacrylic acid ester, polypropylene, polyethylene, etc., or a laminated product of these on a sheet-like base material such as paper or non-woven fabric, or a sheet-like base material with a surface Any substrate can be used as long as it is smooth, printable, unaltered by casting of the hydration curable material, and removable after curing. Preferably, a transparent thermoplastic sheet or film with transparency and moldability is suitable for checking the condition of the printed surface, checking for abnormalities such as air bubbles during casting, and combining with sheet molding embossing. Yes, but
It is not limited to these. There are no particular limitations on the material and method used for the pattern transfer layer, as long as it is transferred to the surface of the hydrated and cured product using the water in the slurry of the hydrated and cured material, but water-soluble release varnish can be applied by gravure and screen printing. A typical method is to print in this order: / pattern ink / porous varnish. As a water-soluble release varnish,
Any material whose main component is a water-soluble resin such as hydroxypropyl cellulose, polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble acrylic, or hydroxymethyl cellulose may be used. Pattern inks and porous varnishes contain large amounts of inorganic fillers such as calcium carbonate, acid clay, magsium carbonate, magnesium hydroxide, kaolin, diatomaceous earth, barium sulfate, talc, calcium silicate, aluminum hydroxide, and slate powder. It is preferable to have an average particle size of 20 μm or less, and the amount added is 100 parts by weight or more based on the binder resin. Any hydration hardening material may be used as long as it is in the form of a slurry and has appropriate fluidity and hydraulic properties, such as various types of gypsum such as hemihydrate gypsum and anhydrite, portland cement, alumina cement, magnesia cement, and mixed cement. These are used alone or in combination with an appropriate amount of water to form a slurry. In this case, various resins, glass fibers, inorganic materials, water reducing agents, surfactants, etc. may be used in combination to improve moldability, strength, etc. The concept and method for stably embodying each of the systems shown in FIGS. 4, 5, and 6 by formulating a composition layer containing a water-absorbing resin will be described. In the method shown in FIG. 4, it is necessary to separate the swollen water-absorbing resin between its layers or at the interface with the transferred pattern. Adhesion of the transfer pattern layer to the base sheet during peeling can be achieved by selecting the solvent system mentioned above, so here we will discuss how the swollen water-absorbing resin and the hydration-curing material bond at the interface with the hydration-curing composition. The conditions are that the adhesion is strong and that the interlayer strength of the swollen water-absorbing resin layer or the interfacial strength with the transferred pattern layer is smaller than this. As a result of research into these factors, the present inventors found that when the blending ratio of the water-absorbing resin is less than 100 parts by weight to 100 parts by weight of the binder resin, the hydration-cured material tends to peel off, and in order to prevent this, at least The blending ratio should be 200 parts by weight, preferably 400 parts by weight or more and 1000 parts by weight or less, and inorganic fillers with relatively small aspect ratios, such as calcium carbonate, magnesium carbonate, barium sulfate, aluminum hydroxide, silica gel, especially organic fillers. It has been found that the objective can be achieved by adding silica gel fine powder etc. that have been surface treated. As an inorganic filler, binder resin
Effects can be seen even when 5 parts by weight or more is added to 100 parts by weight, but desirably 10 to 100 parts by weight is appropriate. In the method shown in FIG. 5, the conditions are that the interlaminar strength of the swollen water-absorbing resin is increased and that the adhesion at the interface with the hydrated cured product is stronger than the surface strength of the cured product. The present inventors have solved this problem by determining the type of binder resin, solvent type, surfactant, reinforcing filler,
As a result of a multifaceted study of reinforcing resins, we found that by adding a relatively small amount of water-soluble resin to the binder resin, the phenomenon shown in the figure can be produced even in systems containing a large amount of water-absorbing resin. We found this and completed this method. Water-soluble resins such as polyethylene glycol, polyvinyl alcohol, hydroxypropyl cellulose, hydroxymethyl cellulose, and polyvinyl pyrrolidone are effective when added in amounts of 5 to 50 parts by weight per 100 parts by weight of the binder resin, but when added in large amounts, On the contrary, it may cause instability such as peeling between the water-absorbing resin layers, so it is desirable to add 30 parts by weight or less. Although this method can also be applied to the method shown in FIG. 6, it is undesirable for the water-soluble resin to exist in a large amount in a layered manner in the product, so it is desirable to keep it to a minimum. In all of the above methods, it is possible to synchronize the transferred pattern and the ink layer containing the water-absorbing resin, and it should be noted that the transferred pattern does not necessarily have to be applied to the entire surface. Although the explanation has been delayed, the transfer sheet may be previously formed before being filled with the slurry of the hydration hardening material. It is preferable to use a vacuum forming method or a pressure forming method for such forming. In such a case, both the unevenness caused by the molded transfer sheet and the unevenness caused by the water-absorbing resin result in an interesting decorative board. Further, by deforming the ends of the transfer sheet and forming the transfer sheet itself into a frame shape, the transfer sheet itself can also serve as a casting frame. According to the method of the present invention, the features of the transfer method during casting of a hydrated curing agent slurry are that it is possible to apply a decoration similar to printing on a substrate that is not compatible with direct printing, and further,
Since molding and transfer are performed at the same time, compared to post-mold transfer, there is no need for surface treatment, no special transfer equipment is required, and a product with an integrated design and molded product can be obtained. Moreover, it is possible to form not only patterns but also irregularities at the same time as molding. In addition, patterns can be formed on the transfer sheet using normal printing methods without the need for special equipment, making it possible to form concave portions with complex patterns that are difficult with other methods. It can be handled in the same way as general printing sheets, such as being rolled up and stacked, and is not bulky, making it easy to store and secure work space. Furthermore, not only can the condition of the concave parts of the product be varied widely from smooth to rough, but when applying a top coat as necessary, the penetration of the top coat resin is different between the convex and concave parts, further emphasizing the unevenness. In particular, it is possible to obtain an expression effect that is equal to or better than the conventional manual process of tiles, bricks, etc., industrially easily and at low cost. Examples based on the method of the present invention are listed below, but the present invention is not limited to these Examples. Example 1 A 0.2 m/m thick unplasticized PVC transparent sheet was coated with a water-soluble release varnish having the following composition A using gravure printing, and then a marble pattern was printed using a porous ink having the following composition B, and then Coat a porous varnish with the following composition C, and print a joint pattern on it using an ink with the following composition D using a 70-mesh screen plate,
A transfer sheet was created. Next, place the transfer sheet with the printed side facing up, fix the mold, pour in the slurry of hydrated curing material composition E, and after curing, remove from the mold and heat at 60°C.
Let dry for 24 hours. Composition A Hydroxypropyl cellulose (solid content 20%) Isopropyl alcohol 50 parts by weight 50 Composition B PVC/vinyl acetate copolymer barium methyl ethyl ketone Toluene pigment 10 parts by weight 45 55 20 Slightly Composition C Polyacrylic acid ester dioxide Silicon methyl ethyl ketone toluene 10 parts by weight 80 〃 50 〃 20 〃 Composition D PVC/vinyl acetate copolymer water-absorbing resin (polyacrylate type) Silica gel (with organic surface treatment) Cyclohexane isophorone 15 〃 60 〃 4 〃 65 〃 30 〃 Hydration Curable Composition Eβ-Gypsum Hemihydrate Water Vinegar Emulsion Glass Fiber 100 parts by weight 60 〃 15 〃 3 〃 As a result, the marble pattern produced by gravure printing is integrated into the convex parts of the product surface, and the grout pattern produced by screen printing is integrated. Therefore, a beautiful decorative gypsum board with a decorative tile-like surface having concave portions without a marble pattern was obtained. Furthermore, by applying an acrylic urethane resin solution to this surface and drying it, the joint area will have a low gloss.
The convex portions became a decorative gypsum board with an even more accentuated design effect of glossy unevenness and excellent surface resistance. Example 2 A 0.1 m/m acrylic transparent sheet was coated with water-soluble release varnish of composition A of Example 1 by gravure printing, and a brick pattern was further printed with porous ink of composition B of Example 1, Next, a porous varnish having composition C of Example 1 was coated. From above, the following composition E-1
A joint pattern was printed using a 70-mesh screen plate with ~E-5 ink to create a transfer sheet. Using these transfer sheets, a gypsum board was created in the same manner as in Example 1, and the results were as shown in Table 1 below.

[Table] Example 3 A 0.2 m/m thick unplasticized PVC transparent sheet was coated with water-soluble release varnish of composition A of Example 1 by gravure printing, and then coated with porous ink of composition B of Example 1. A wood grain pattern was printed and then coated with a porous varnish of composition C of Example 1. From above, the following composition F-
A pattern was printed using a 70Me screen plate with inks of 1 to F-6 to create a transfer sheet. When gypsum boards were created using these transfer sheets in the same manner as in Example 1, the results were as shown in Table 2 below.

[Table] Example 4 0.2m/m thick unplasticized PVC transparent sheet and 0.2m/m thick
A one-sided corona-treated CPP sheet with a thickness of m was coated with a water-soluble release varnish of composition A of Example 1 using a gravure printing method, and a travertine pattern was further printed with a porous ink of composition B of Example 1. 1 composition C
coated with porous varnish. A joint pattern was printed on this using inks having the following compositions G-1 to G-5 using a 70Me screen plate to create a transfer sheet.
When gypsum boards were created using these transfer sheets in the same manner as in Example 1, the results were as shown in Table 3 below.

[Table] Example 5 A 0.2 m/m unplasticized PVC transparent sheet was coated with water-soluble release varnish of composition A of Example 1 by gravure printing, and then coated with porous ink of composition B of Example 1. A wood grain pattern was printed and then coated with a porous varnish of composition C of Example 1. From above, the following composition H-
A pattern was printed using a 70-mesh screen plate with inks of 1 to H-5 to create a transfer sheet. Using these transfer sheets, a gypsum board was created in the same manner as in Example 1, and the results were as shown in Table 4 below.

[Table] Example 6 0.05 using an extruder on 60g/ ^m2 base paper
Using a base sheet coated with polypropylene to a thickness of m/m, a water-soluble release varnish of composition A of Example 1, a porous ink of composition B of Example 1, a porous varnish of composition C of Example 1, and the following composition 1 were prepared. The gravure inks were applied in this order using a gravure multicolor printing machine to create a transfer sheet. The porous ink plate of Composition B uses three colors of travertine pattern with a plate depth of 40μ, and the gravure ink of composition uses a pattern that matches the travertine pattern with a plate depth of 250μ. I printed it with When a gypsum board was created using this transfer sheet in the same manner as in Example 1, a beautiful decorative gypsum board having recesses that matched the travertine pattern was obtained. Composition PVC/acrylic copolymer water absorbent resin (polyacrylate type) Polyethylene glycol-2000 Cyclohexanone ethyl cellosolve isopropyl alcohol 18 parts by weight 72 〃 5 〃 70 〃 20 〃 30 〃 Example 7 0.1 m/m thick unplasticized PVC transparent Example 1 on the sheet
A water-soluble release varnish of composition A of Example 1, a porous ink of composition B, and a porous varnish of composition C of Example 1 were coated and printed in this order to create a printed sheet with a stone grain pattern, and the following composition J was coated and printed in this order. using the ink of
The check pattern was printed using the 80Me screen plate. This transfer paper is formed into a tile shape by vacuum forming so that the ink side becomes the inner surface, and while it is held in a mold, a mortar of the following composition K is poured into it, and after curing, the mold is removed and dried, and an acrylic urethane-based paint is applied. The surface was painted with As a result, a beautiful decorative tile-like decorative article with a stone-like texture having a check-like rough surface concavity was obtained. Composition J PVC/vinyl acetate copolymer water-absorbing resin (starch kraft system) Silica gel cyclohexanone methyl ethyl ketone xylene 15 parts by weight 75 〃 9 〃 60 〃 15 〃 20 〃 Composition K Cement Fine aggregate Water reducer Glass fiber water 100 〃 200 〃 3 〃 0.5 〃 65 〃 Example 8 Water-soluble release varnish of composition A of Example 1, porous ink of composition B of Example 1, porous varnish of composition C of Example 1 on a 0.2 m/m thick non-plastic PUC sheet was coated and printed using a gravure printing method, and further printed using a 60-mesh screen plate using inks having the following compositions L-1 to L-3 to create a transfer sheet with a brick pattern.

[Table] Using these transfer sheets, gypsum boards were created in the same manner as in Example 1. When L-1 ink was used, a brick-like appearance with smooth joint concave surfaces was created. The decorative plaster board is also L-
When ink layer No. 2 was used, a brick-like decorative gypsum board with a dynamic feel and a rough joint concave surface was obtained. In addition, when ink L-3 is used, a decorative gypsum board with slightly rough concave joints with an impression very similar to actual brick joints is obtained, which is then spray-painted with acrylic urethane paint. As a result, the luster of the surface and the condition of the joints were further emphasized, resulting in a beautiful decorative board that expressed the feel of the actual material. Example 9 A tile joint pattern was printed on a 0.2 m/m unplasticized PVC sheet using an ink of composition M using a 70 mesh screen plate. This sheet was molded into a 1m x 2m formwork in the same manner as in Example 1 to a thickness of 10m/2m.
A slurry of composition D was filled in the mold, and after curing, the mold was demolded and dried.An acrylic resin was coated at 80 g/m ² dry using a curtain flow coater and dried. Composition M PVC/vinyl acetate copolymer water absorbent resin (polyacrylate-based) Surface treatment Calcium carbonate cyclohexanone toluene 15 parts by weight 80 〃 9 〃 65 〃 30 〃 As a result, the tile joint area becomes a recess, and the surface of the plain tile is extremely A decorative gypsum board with similar appearance and excellent workability was obtained.

[Brief explanation of the drawing]

FIG. 1 to FIG. 3 are explanatory diagrams showing the process up to the middle of the method for manufacturing a decorative board of the present invention, and FIG. 4 to FIG. It is an explanatory view showing each process. DESCRIPTION OF SYMBOLS 1... Ink layer containing water absorbent resin, 2... Transfer pattern layer, 3... Base sheet, 4... Slurry of hydrated hardening material, 1'... Water absorbing resin layer, 4'... Hydrated hardened material, 1''
...Water absorbent resin layer after drying.

Claims (1)

[Claims] 1 A transfer pattern layer of a transfer sheet in which a transfer pattern layer consisting of a release varnish, a pattern ink, and a porous varnish layer is provided on one side of a base sheet, and an ink layer partially containing a water-absorbing resin is provided on the transfer pattern layer. A method for manufacturing a decorative board, characterized by filling the side with a hydration hardening material, forming a hydration hardening material, and then removing the mold.