JP2005212186A - Decorating method for molded article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorating method for a molded article, which enables a pattern excellent in hot/warm water resistance and fixability to be evenly transferred to a decorating surface of the molded article by using a hydraulic transfer method. <P>SOLUTION: In a process provided in this decorating method for the molded article, a coating for forming a transfer ink fixing layer is applied to the decorating surface of the molded article, heated and dried up to a predetermined degree of drying, so that the transfer ink fixing layer can be formed; and after that, a printing pattern is hydraulically transferred and printed onto the transfer ink fixing layer from a transfer sheet, whereon the printing pattern is pre-drawn, by means of transfer ink. The decorating method is characterized in that the coating for forming the coating for forming the transfer ink fixing layer is heated and dried while the whole decorating surface of the molded article is kept at an almost uniform temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for decorating a decorative surface such as a molded product made of FRP such as a bathtub, a counter, and an apron used in a bathroom unit.

As a method for decorating decorative surfaces such as FRP molded products such as bathtubs, counters, and aprons used in bathroom units, a method of hot press printing a preliminarily processed sublimation transfer sheet has been proposed (for example, Patent Document 1).
However, in the case of the decorating method using the sublimation transfer sheet, there is a problem that the sublimation transfer sheet has to be processed and molded in advance, which increases costs.

  On the other hand, in the case of a hydraulic transfer method (for example, see Patent Document 2) excellent in transferability of a pattern to a curved surface, there is a problem in the hot water resistance and fixability of the transferred pattern as disclosed in Patent Document 1 There is.

  That is, in the case of the hydraulic transfer method, the transfer ink fixing layer is formed on the decorative surface of the molded product before the transfer paper image printed with the transfer ink is transferred to the decorative surface of the molded product. According to the knowledge obtained by the inventors of the present invention, the dryness of the transfer ink fixing layer forming paint constituting the transfer ink fixing layer is determined by the heat resistance of the pattern. And fixability greatly. Explaining in detail, the transfer ink fixing layer is obtained by applying the transfer ink fixing layer forming paint to the decorative surface of the molded product and drying it by heating. However, a pattern flow may occur. Further, if the drying is insufficient, the transfer ink is fixed, but there is a problem in hot water resistance. In addition, if the allowable range of the drying conditions is narrow and the drying temperature distribution is different, a part having poor fixability or a part lacking hot water resistance tends to occur. In particular, in the case of molded products in which the reinforcing ribs and fins on the back side partially protrude, after applying the transfer ink fixing layer forming paint, the molded product is placed in a hot air drying oven to form the transfer ink fixing layer. When the paint is to be dried, hot air stays in the portions surrounded by the reinforcing ribs and the reinforcing ribs or fins, and the temperature distribution on the surface side of the molded product tends to vary, resulting in uneven drying.

JP 2000-1096 A JP 2003-251999 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for decorating a molded product that can transfer a pattern having excellent heat resistance, hot water resistance and fixing properties to the decorative surface of the molded product using a hydraulic transfer method. It is said.

  In order to achieve the above object, a method for decorating a molded product according to the present invention comprises applying a transfer ink fixing layer forming coating to the decorative surface of the molded product, and applying the transfer ink fixing layer forming coating to a predetermined degree of dryness. After forming a transfer ink fixing layer by heating and drying until it becomes, decoration of a molded article comprising a step of hydraulic transfer printing the pattern from a transfer sheet on which a print pattern is previously drawn with transfer ink on the transfer ink fixing layer The method is characterized in that the coating material for forming a transfer ink fixing layer is heated and dried while maintaining the entire decorative surface of the molded article at a substantially uniform temperature.

  In addition, in the case of the decorating method of the present invention, when the transfer ink fixing layer forming coating is heated and dried, a jig having a different heat dissipation efficiency is partially attached to the non-decorated surface of the molded product to completely decorate the decorated surface. By controlling the temperature to a substantially uniform temperature, the non-decorated surface side of the molded product is formed in a concavo-convex shape so that the entire decorated surface becomes a substantially uniform temperature when the transfer ink fixing layer forming paint is heated and dried. Or, when the molded product is dried by heating the coating material for forming the transfer ink fixing layer, a member having a different thermal conductivity is embedded at a desired position inside the molded product so that the entire decorative surface is at a substantially uniform temperature. Preferably it is.

Moreover, the decorating method of this invention is although it does not specifically limit, For example, it uses suitably for the molded article exposed to hot water like the bathtub of a bathroom unit, an apron, a counter etc., for example. The material of the molded product is not particularly limited, and examples thereof include fiber reinforced plastic (FRP).
In the present invention, the transfer sheet refers to a printed picture printed with a transfer ink on a water-soluble or water-swellable base film. The material of the base film is not particularly limited, but polyvinyl alcohol ( Poval) is used as a main component, and a known product obtained by mixing polyacrylamide, other water-soluble polymer, starch, gelatin, glue or the like as necessary is preferably used.

  Since the decoration method of the molded product according to the present invention is such that the transfer ink fixing layer forming coating is dried by heating while controlling the temperature of the entire decorative surface to a substantially uniform temperature, the entire decorative surface is heated. The coating material for forming the transfer ink fixing layer is dried almost uniformly. Therefore, the transfer ink fixing layer obtained has a predetermined dryness evenly on the entire decorative surface, and the transfer ink can be firmly hydraulically transferred, resulting in a decoration with excellent hot water resistance and durability. It can be formed on the decorative surface.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 to 3 show a first embodiment of a method for decorating a molded product according to the present invention.

In this decoration method, decoration is applied to the molded product 1 in which the rib 12 is provided on the back surface of the decoration surface 11 as shown in FIG. 1, and as shown in FIG. A portion surrounded by the FRP jig body 21 formed by a hand lay-up method or the like having a shape substantially conforming to the back surface shape of the molded article 1, and the rib 12 and the rib 12 of the molded article 1 of the jig body 21. The temperature equalizing jig 2 composed of the heat transfer material 22 made of aluminum embedded in a position along the line is formed in advance.
Then, the FRP molded product 1 shown in FIG. 1 is molded, and the release agent remaining in the molded product 1 is degreased and removed using a solvent. For example, an epoxy primer coating is applied to the decorative surface 11 of the molded product 1. After that, the molded product 1 is put in a heating and drying furnace (not shown) and baked and dried to form a primer coating layer (not shown) on the decorative surface 11.

Next, as shown in FIG. 2B, for example, a transfer ink fixing layer forming coating is applied to the surface of the primer coating layer with the temperature equalizing jig 2 attached to the back surface of the molded product 1. After that, with the temperature equalizing jig 2 attached to the back surface of the molded product 1, the molded product 1 is placed in a heating and drying furnace and dried by heating to form a transfer ink fixing layer.
Thereafter, as shown in FIG. 3 (a), the transfer sheet 3 on which a printed pattern is printed on a base film mainly composed of polyvinyl alcohol is floated on water, and the polyvinyl alcohol constituting the base film is dissolved in water 4. In addition, after spraying an activator (for example, an organic solvent such as thinner) on the transfer ink of the transfer sheet 3 to dissolve the transfer ink, as shown in FIG. The molded product 1a on which the transfer ink fixing layer is formed in the detached state is pressed against the transfer sheet 31 in the dissolved state on the decorative surface 11 side and submerged in water, and the print pattern of the transfer sheet 31 is transferred to the transfer ink fixing layer by water pressure Transcript to.

Next, the molded product 1 is pulled up and the residue of the base film component remaining after the transfer is washed away with warm water. Then, water droplets on the surface are wiped off and placed in a drying furnace to dry and remove moisture absorbed in the coating film.
Then, for example, after applying an acrylic urethane topcoat paint on the transfer ink layer as necessary, the topcoat paint is baked and dried.

Since this decorating method is as described above, the coating material for the transfer ink fixing layer coated on the decorating surface in the state where the temperature equalizing jig 2 is attached to the molded product 1 is dried by heating. Even if the heating between the ribs 12 and the ribs 12 is poor due to hot air retention, the heat transfer material 22 embedded in the temperature uniformizing jig 2 allows the heat from the heating furnace to be transmitted more efficiently than the other parts, resulting in a result. As described above, the coating material for the transfer ink fixing layer is dried on the decorative surface side under substantially uniform conditions.
Therefore, the obtained transfer ink fixing layer has a predetermined dryness evenly on the entire decorative surface, and the transfer ink of the transfer sheet 3 can be firmly hydraulically transferred to the transfer ink fixing layer, resulting in hot water resistance and durability. Can be formed on the decorative surface of the molded product.

Moreover, even if the heat drying temperature (baking drying temperature) of the primer paint, the top coat paint, and the transfer ink fixing layer forming paint is different, the temperature raising time can be increased by attaching the temperature equalizing jig 2 to the molded product 1. Thus, the primer paint, the top coat paint, and the transfer ink fixing layer forming paint can be dried under the same equipment conditions. Moreover, even when the sizes of the molded products are different, they can be dried using the same drying furnace only by changing the temperature equalizing jig 2.
Therefore, equipment costs such as a drying furnace can be reduced, and productivity is improved.

FIG. 4 shows a second embodiment of the method for decorating a molded product according to the present invention.
As shown in FIG. 4, in this decorating method, when the molded product 5 is put in a heating and drying furnace, the molded product main body 51 so that the surface temperature of the decorated surface 50 of the molded product 5 is substantially uniform over the entire surface. A temperature equalizing jig 2 is used by using a molded product 5 in which a reinforcing material 52 made of a material (for example, a metal material such as aluminum) having a thermal conductivity different from that of the molded product main body is embedded in a position considering heat conductivity. Except for the above, it is the same as the first embodiment.

The decoration method of the molded product concerning this invention is not limited to said embodiment. For example, the temperature of the decorative surface may be made uniform by adjusting the shape and arrangement of the ribs of the molded product or the thickness without using the temperature uniformizing jig 2.
Moreover, you may make it provide a gel coat layer in the decorating surface of a molded article as needed.

It is sectional drawing showing one example of the molded product decorated by the decoration method of the molded product concerning this invention. It is a figure explaining 1st Embodiment of the decoration method of the molded product concerning this invention which decorates the molded product of FIG. 1 in order of a process, The figure (a) is the temperature equalization jig | tool before mounting | wearing FIG. 4B is a cross-sectional view showing the state after the temperature equalizing jig is mounted. It is a figure explaining 1st Embodiment of the decoration method of the molded product concerning this invention which decorates the molded product of FIG. 1 in order of a process, The figure (a) is the state which floated the transfer sheet in water FIG. 4B is a cross-sectional view showing a state of hydraulic transfer to a molded product. It is 2nd Embodiment of the decoration method of the molded product concerning this invention, Comprising: It is sectional drawing showing 1 example of the molded product decorated.

Explanation of symbols

1, 5 Molded product 2 Temperature uniformizing jig 3 Transfer sheet 4 Water 11 Decorating surface 12 Rib 21 Jig body 22 Heat transfer material 51 Reinforcing material

Claims (4)

The transfer ink fixing layer forming coating is applied to the decorative surface of the molded product, and the transfer ink fixing layer forming coating is heated and dried to a predetermined dryness to form a transfer ink fixing layer. A method for decorating a molded article comprising a step of hydraulic transfer printing the pattern from a transfer sheet on which a printed pattern is previously drawn with transfer ink on a layer,
A method for decorating a molded product, comprising: drying the coating for forming a transfer ink fixing layer while maintaining the entire decorative surface of the molded product at a substantially uniform temperature.   The heat transfer drying of the coating material for forming the transfer ink fixing layer is performed by adding a jig having a different heat dissipation efficiency to the non-decorated surface of the molded product to control the entire decorated surface to a substantially uniform temperature. The method of decorating the described molded product.   The molded article according to claim 1, wherein the non-decorated surface side of the molded article is formed in a concavo-convex shape so that the entire decorated surface has a substantially uniform temperature when the transfer ink fixing layer forming paint is heated and dried. Decoration method.   2. The molded product is embedded with members having different thermal conductivities at desired positions inside the molded product so that the entire decorative surface has a substantially uniform temperature when the transfer ink fixing layer forming coating is heated and dried. A method for decorating a molded product according to 1.

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