WO2014041663A1 - Hydraulic transfer sheet, hydraulic transfer method, and decorative coating - Google Patents

Description

Water pressure transfer sheet, water pressure transfer method and decorative coating

The present invention relates to a decorative coating formed on the surface of furniture, joinery, vehicle interiors, etc. (decorative object) by hydraulic transfer, a hydraulic transfer sheet used to form the decorative coating, and the hydraulic transfer sheet The present invention relates to a hydraulic transfer method performed using

Conventionally, a water pressure transfer sheet and a water pressure transfer method for forming a decorative coating on the surface to be decorated using the water pressure transfer sheet have been proposed (see Patent Document 1 below).

The conventional hydraulic transfer sheet described in Patent Document 1 described below has a water-soluble film and a printed layer that is a layer formed by printing on the water-soluble film. Further, in the water pressure transfer method using the water pressure transfer sheet, an ultraviolet curable resin is placed on the printing layer on the water soluble film prior to immersing the water soluble film of the water pressure transfer sheet in water. Apply composition (topcoat) and allow to penetrate. Thereby, the said composition is made flexible and it is tinged with adhesiveness. Next, the water pressure transfer sheet is immersed in water, and water pressure transfer is performed by adhering the water pressure transfer sheet to the surface to be decorated via the composition. Thereafter, the water-soluble film is washed away, and the composition is dried and cured. As a result, a decorative film including a printed layer covered with the cured composition is formed on the surface of the object to be decorated.

Further, Patent Document 1 described below has the effect that (1) the pigment contained in the printing ink in the printing layer absorbs part of the composition applied to the printing layer. (2) the strength of the absorption effect depends on the concentration of the pigment in the printing ink, and (3) the surface of the composition (of the decorative film) depending on the strength of the pigment or the presence or absence of the pigment. A surface portion having a large number of fine convex portions generated by the absorption action of the pigment, and other surface portions where such convex portions are relatively few or absent, And (4) that these two surface portions have different gloss levels, i.e., the former surface portion has a relatively low gloss and the other other surface portion has a relatively high gloss. It is disclosed. It is considered that such a difference in glossiness on the surface of the decorative film causes a three-dimensional sensation due to an illusion to the viewer and enhances the decorative function of the decorative film.

By the way, the pigment is generally used for expressing the color of the picture represented in the decorative coating. Therefore, the conventional technique involves selection and preparation of the pigment type, amount, etc., taking into consideration both the color expression of the pattern and the difference in glossiness on the surface of the decorative coating. However, such selection and preparation of the pigment type and amount are not easy in practice.

In addition, according to the experiment conducted by the applicant, the ability to produce two surface portions having different glossiness on the surface of the decorative film is effective for all pigments. It turns out that it only exists in carbon black, not in it. Therefore, in order to develop a difference in glossiness on the surface of the decorative coating, it is necessary that the printed layer contains carbon black. However, carbon black is not necessarily required for the color expression of the pattern. In addition, the necessary inclusion of carbon black may limit the degree of freedom in creating the picture and the color selection associated therewith in order to further improve the decoration of the decoration object.

Japanese Patent No. 3881002

Accordingly, an object of the present invention is a decorative film formed on a surface to be decorated by hydraulic transfer and having a glossy surface formed without depending on a pigment, and the decorative film is formed. An object of the present invention is to provide a water pressure transfer sheet and a water pressure transfer method.

The present invention relates to a hydraulic transfer sheet. This hydraulic transfer sheet includes a water-soluble film and a printed layer formed on the water-soluble film. The printing layer includes a resin (hereinafter sometimes referred to as “absorbing resin”) that can absorb a part of the top coat formed on the surface of the printing layer so as to cover the surface after the hydraulic transfer.

According to the present invention, the absorbing resin contained in the printing layer has an absorbing action on a part of the top coat that is formed after the hydraulic transfer and covers the printing layer. This absorption action causes a number of fine recesses in a part of the surface of the topcoat. A part of the surface of the top coat in which these many recesses exist has an uneven shape as a whole. On the other hand, the other part which does not receive the absorption effect of the resin on the surface of the top coat exhibits a smooth shape as a whole. The uneven surface portion has a higher degree of irregular reflection with respect to incident light than the other smooth surface portion. For this reason, the uneven surface portion and the smooth surface portion have a relatively low gloss level and a relatively high gloss level, respectively. For this reason, the surface to be decorated includes the top coat having a surface with a difference in glossiness (that is, a surface consisting of a so-called matte surface having a low glossiness and a so-called glossy surface having a high glossiness). A film is formed. Accordingly, the pattern or color displayed by the printed layer of the decorative film enters the eye through the matte and glossy surfaces of the topcoat. In the present invention, for example, a urethane resin or an acrylic resin can be used as the absorbing resin.

The printing layer is composed of a pattern printing layer portion and a solid printing layer portion sequentially formed on the water-soluble film, and the absorbing resin is included in all or part of the pattern printing layer portion. Can be. According to this, in the former example in which the absorbing resin is present in the entire pattern print layer portion, a part of the surface of the top coat covering the entire pattern print layer portion and the solid print layer portion are covered. The other part of the surface of the top coat can have a low glossiness (so-called matte surface) and a high glossiness (so-called glossy surface). Further, in the latter example in which the absorbing resin is present in a part of the pattern printing layer part, a part of the surface of the top coat covering a part of the pattern printing layer part, a remaining part of the pattern printing layer part, and the The other part of the surface of the top coat covering the solid print layer portion can be made to have a low glossiness (matte surface) and a high glossiness (glossy surface).

Here, all or a part of the pattern printing layer portion containing the absorbing resin is only the absorbing resin (however, the solvent contained in the printing ink used for forming the pattern printing layer portion is excluded; the same applies hereinafter). Or composed of the absorbing resin and the pigment. According to the former example in which all or part of the pattern print layer portion is made of only the resin, all or part of the pattern displayed by the pattern print layer portion can be made colorless and transparent. Further, according to the latter example in which all or a part of the picture print layer is composed of the resin and the pigment, the picture print layer portion displays all or one of the pictures displayed by adjusting the content of the pigment. The part can be colored transparent or colored opaque. When the pigment is made of carbon black, it is desirable to coat the carbon black in advance with an appropriate resin that inhibits the function of the carbon black to absorb the top coat.

Furthermore, the printing layer may be composed only of the pattern printing layer portion, and the absorbing resin may be included only in a part of the pattern printing layer portion. According to this, a part of the surface of the top coat and another part of the top coat covering a part of the pattern printing layer part and the other part, respectively, have a low glossiness (matte surface) and a high It can have a glossiness (glossy surface).

Here, a part of the pattern printing layer portion may be made of the absorbing resin, or may be made of the absorbing resin and a pigment. According to the former example in which a part of the pattern print layer portion is made of the absorbing resin, a part of the pattern displayed by the pattern print layer portion can be made colorless and transparent. Further, according to the latter example in which a part of the pattern printing layer is composed of the absorbing resin and the pigment, a part of the pattern displayed by the pattern printing layer unit is colored by adjusting the content of the pigment. It can be transparent or colored and opaque.

The present invention also relates to a water pressure transfer method performed using the water pressure transfer sheet. This hydraulic transfer method includes immersing a water-soluble film of the hydraulic transfer sheet in water, applying an activator that causes the printed layer to be adhesive on the printed layer of the hydraulic transfer sheet, Under the action of water pressure on the adhesive film, the hydraulic transfer sheet is adhered to the surface to be decorated via the printed layer, the water-soluble film is removed, the surface on the printed layer Forming a top coat covering the substrate, and thereafter curing the top coat.

According to the present invention, a decorative coating is applied to the surface of the decoration target by adhering the printing layer to the surface of the decoration target, removing the water-soluble film, and forming the top coat on the printing layer. Is formed. After the top coat is formed, the top coat is subjected to a chemical absorption action by the absorbing resin of the printing layer, thereby generating a number of fine recesses in a part of the surface of the top coat. A part of the surface of the top coat having a large number of fine recesses gives a surface portion (matte surface) having a relatively low gloss to the decorative coating, and another part of the top coat is Other surface portions having a relatively high glossiness (glossy surface) are provided.

Here, the top coat is preferably made of a resin that is cured by irradiation with ionizing radiation. This resin can be cured by irradiating it with ionizing radiation.

Furthermore, the present invention relates to a decorative coating formed on the surface to be decorated using the hydraulic transfer sheet. The decorative coating includes a printing layer of the hydraulic transfer sheet that is hydraulically transferred to the surface of the decoration target, and a top coat covering the surface of the printing layer, and the top coat defines a surface of the decorative coating. The surface includes a surface portion (matte surface) generated by the absorption action of the resin and another surface portion (glossy surface). This decorative film is formed by carrying out the hydraulic transfer method.

(A) to (h) are process diagrams of a water pressure transfer method performed using a water pressure transfer sheet according to an example of the present invention. However, the hydraulic transfer sheet shown in the cross-sectional view is hatched only for the pattern print layer portion that forms a part of the print layer in order to avoid complication of the drawing. (A) And (b) is each the expanded sectional view of the sheet | seat for hydraulic transfer shown in FIG. 1, and the enlarged plan view seen through the solid printing layer part. (A) And (b) is the top view seen through the cross-sectional view similar to FIG. 2, and the solid printing layer part which show the sheet | seat for hydraulic transfer which concerns on the other example of this invention, respectively.

Referring to FIG. 1, using a hydraulic transfer sheet 10 (FIG. 1 (a)) according to an example of the present invention, a decorative coating 16 (FIG. 1 (d)) is applied to the surface 14 of a decoration target 12 (FIG. 1 (d)). Steps of performing the method h)) (hydraulic transfer method) are shown.

The water pressure transfer sheet 10 used for forming the decorative coating 16 by carrying out the water pressure transfer method includes a water soluble film 18 and a printed layer 20 formed by printing on the surface of the water soluble film. including. The decoration object 12 on which the decorative film 16 is formed is made of, for example, furniture, joinery, vehicle interior goods, or the like.

The water-soluble film 18 of the hydraulic transfer sheet 10 is made of, for example, polyvinyl alcohol, and has a property that it swells and collapses when immersed in water. The printing layer 20 includes a pattern printing layer portion 22 that is sequentially formed on the surface of the water-soluble film 18 and a solid printing layer portion 24 that forms the background of the pattern printing layer portion. The printing layer 20 can be composed of only the pattern printing layer portion 22 that does not have the solid printing layer portion 24 (not shown).

As shown in FIG. 1A and FIG. 2A and FIG. 2B showing an enlarged part thereof, the pattern print layer portion 22 of the print layer 20 is a single display that displays the entire pattern. It is formed using a plate (not shown), or it is formed using a plurality of plates (not shown) that respectively display a plurality of picture portions constituting the picture. FIG. 3A and FIG. 3B show two picture printing layer portions that are sequentially formed on the surface of a water-soluble film using two plates (not shown) as an example of the plurality of plates. The pattern printing layer 22 consisting of 22A and 22B is shown.

Referring to FIG. 2A and FIG. 2B, the pattern print layer unit 22 includes one or a plurality of image portions 23a that form a part of the picture represented by the pattern print layer unit 22 and one or more that forms the other part of the picture. And a non-image portion 23b composed of a plurality of spaces. A part of the solid print layer portion 24 is exposed on the surface of the pattern print layer portion 22 through the non-image portion 23 b of the pattern print layer portion 22.

In the example shown in FIGS. 3A and 3B, one pattern print layer portion 22A constituting the pattern print layer portion 22 includes one or more image portions 25a and one or more non-image portions 25b. And the other pattern printing layer portion 22B has one or more video portions 27a and one or more non-image portions 27b. In the illustrated example, the non-image portions 25b and 27b of the two picture print layer portions 22A and 22B communicate with each other. The solid print layer portion 24 is formed by forming the pattern print layer portion 22 on the water-soluble film 18 and then overlapping the pattern print layer portion 22 using, for example, a single plate (not shown).

The printing layer 20 of the hydraulic transfer sheet 10 is coated on the printing layer 20 so as to cover the surface thereof, and the printing layer 20 is visible, for example, a transparent top coat 26 (FIG. 1 (f)-(h )) Part of the resin (absorbing resin) that can be absorbed. The absorbent resin is included in the entire pattern print layer portion 22 (FIG. 2), or included in either one of the pattern print layer portions 22A and the other pattern print layer portion 22B (FIG. 3). can do.

All 22 (FIG. 2) or a part 22A or 22B (FIG. 3) of the pattern printing layer portion containing the absorbing resin consists of the absorbing resin only, except for the solvent of the printing ink used to form them. Or it can consist of the pigment which is the coloring agent or coloring element about the said pattern, and the said absorption resin. On the other hand, the solid print layer portion 24 contains an arbitrary pigment, but does not contain the absorbing resin. The absorbing resin is preferably made of urethane resin, acrylic resin or the like.

Here, from the findings of the applicant's experiment, when the pigment is carbon black, a measure for blocking the absorption function to be described later with respect to the top coat 26 of the carbon black, such as It is desirable to coat the carbon black in advance with an arbitrary resin having a blocking ability (different from the absorbing resin, such as vinyl resin or polyamide resin). On the other hand, pigments other than carbon black do not have the ability to absorb the top coat from the findings of the experiment, and therefore do not require the coating for these pigments.

In the example in which only the absorbing resin is included in the whole (23a) or a part (25a or 27a) of the pattern printing layer portion, since the pigment as a coloring agent is not included, the entire pattern printing layer portion The pattern displayed by (23a) or a part thereof (25a or 27a) is colorless and transparent. On the other hand, when the absorption resin and the pigment are contained in all (23a) or a part (25a or 27a) of the pattern printing layer part, all (23a) or a part of the pattern printing layer part ( Since the picture displayed by 25a or 27a) contains a pigment as a colorant, it is colored transparent or colored opaque depending on the amount of the pigment. The amount of the pigment can be arbitrarily adjusted.

Referring to FIG. 1 again, in order to form the decorative film 16 on the surface 14 of the decoration object 12, first, the water pressure transfer sheet 10 is put in the water tank 28, and the water-soluble film 18 is placed downward. It is immersed in the water 30 in the water tank 28 (FIG. 1B).

Water-soluble film 18 immersed in water 30 sucks water, gradually swells, and partially collapses. After immersing the water-soluble film 18 in the water 30, the activator 32 is applied to the surface of the solid print layer portion 24 (one surface of the print layer 20) (FIG. 1C). The surface of the solid print layer portion 24 is softened by the chemical action of the activator 32 and becomes adhesive. It is desirable that the activator 32 does not contain the absorbent resin and any other resin so that the absorption function of the absorbent resin is reduced or not inhibited. Examples of such an activator 32 include methyl ethyl ketone, ethyl acetate, and ethyl alcohol.

Here, in the example in which the printing layer 20 does not have the solid printing layer portion 24, that is, in the example in which the printing layer 20 includes only the pattern printing layer portion 22, the activator 32 defines one surface of the printing layer 20. It is applied to the surface of the pattern print layer portion 22 or is applied to the surface of the pattern print layer portion 22B. Due to the chemical action of the activator 32, the surface of the pattern printing layer portion 22 or the surface of the pattern printing layer portion 22B is softened and has adhesiveness.

Next, the decoration object 12 is placed on the exposed surface of the solid print layer portion 24 having adhesiveness of the water pressure transfer sheet 10 in the water tank 28 (FIG. 1D). Thereby, the hydraulic transfer sheet 10 further sinks in water. At this time, the pattern printing layer portion 22 and the solid printing layer portion 24 thereon are subjected to water pressure through the water-soluble film 18, and the hydraulic transfer sheet 10 is to be decorated via the solid printing layer portion 24 under the action of the water pressure. 12 is pressed against the surface 14 and bonded.

Here, in the example in which the print layer 20 does not have the solid print layer portion 24, the decoration target 12 is placed on the design print layer portion 22 or the design print layer portion 22B in an adhesive state. Placed. Further, the hydraulic transfer sheet 10 is bonded to the surface 14 of the decoration target 12 via the pattern printing layer portion 22 or the pattern printing layer portion 22B.

Thereafter, the decoration object 12 and the hydraulic transfer sheet 10 adhered thereto are taken out from the water tank 28, and the water-soluble film 18 of the hydraulic transfer sheet 10 is washed off with water. After washing off the water-soluble film 18, the printed layer 20 is dried (FIG. 1 (e)). As the water-soluble film 18 is washed away or removed, the other surface of the printed layer 20 that faces the one surface appears. For the convenience of forming the top coat 26 in the next step, the other surface of the printing layer 20 is directed upward.

After the printing layer 20 is dried, a top coat 26 covering the other surface of the printing layer 20 is formed. The top coat 26 is formed, for example, by other constituents of the constituent resin relative to the other surface of the printing layer 20, that is, the surface of the pattern printing layer portion 22 (the pattern printing layer portion 22A in the example shown in FIG. 3). This is performed by spraying the constituent resin of the top coat 26 toward the surface (FIG. 1 (f)). The constituent resin of the sprayed top coat 26 covers the surface of the image portion 23a in the pattern print layer portion 22 and fills the non-image portion 23b (FIG. 1G) (in the example shown in FIG. Covers the surface of the image portion 25a in the layer portion 22A and fills the non-image portion 25b and the non-image portion 27b in the picture print layer portion 22B).

The top coat 26 is a resin that has a property of being cured by heating, or a resin that is preferably cured by irradiation with ionizing radiation such as ultraviolet rays and electron beams as in the illustrated example, such as urethane acrylate, polyester acrylate, and epoxy. It can consist of an acrylate etc. A top coat made of these resins is particularly preferable because it has a characteristic of being easily absorbed by the absorbent resin.

Thereafter, the top coat 26 is irradiated with ionizing radiation 34, thereby curing the top coat 26 (FIG. 1 (h)). As a result, the decorative film 16 including the printed layer 20 and the top coat 26 covering the printed layer 20 is formed on the surface 14 of the decoration target 12.

The top coat 26 is included in the pattern print layer portion 22 (the pattern print layer portion 22A in the example of FIG. 3) on the contact surface with the pattern print layer portion 22 (the pattern print layer portion 22A in the example of FIG. 3). In response to the absorption action of the absorbing resin, the constituent resin is absorbed into the pattern print layer portion 22 (the pattern print layer portion 22A in the example of FIG. 3) (see FIGS. 1G and 1H). . As a result of this absorbing action, a large number of fine recesses 38 appear upward on the surface portion 36 which is a part of the entire surface of the top coat 26 in the figure. These recesses 38 make the surface portion 36 uneven, and the surface portion irregularly reflects light incident thereon.

On the other hand, the other surface of the top coat 26 that is in contact with and covers a part of the solid print layer portion 24 (the pattern print layer portion 22B and the solid print layer portion 24 in the example shown in FIG. 3) that does not contain the absorbent resin. Such a recess 38 does not appear in the portion 40. For this reason, the surface portion 40 is relatively smooth, and the degree of irregular reflection of light incident on the surface portion 40 is relatively smaller than that of the surface portion 36.

From the above, the surface portion 36 of the top coat 26 that covers the pattern print layer portion 22 (the pattern print layer portion 22A in the example of FIG. 3) defines a so-called matte surface having a relatively low gloss, The surface portion 40 on the solid print layer portion 24 (the pattern print layer portion 22B and the solid print layer portion 24 in the example of FIG. 3) defines a so-called glossy surface having a relatively high degree of gloss. Since the surface of the top coat 26 defines the surface of the decorative film 16, the decorative film 16 having a surface with a difference in glossiness can be obtained.

The difference in glossiness is preferably about 10. The top coat 26 preferably has a gloss value of 20-30.

Instead of the pattern print layer portion 22A, the pattern print layer portion 22B may be made of only the absorbing resin, or may be made of the absorbing resin and a pigment. According to this, the constituent resin of the top coat 26 is absorbed in the pattern print layer portion 22B in the surface portion where the top coat 26 formed on the print layer 20 so as to cover it is in contact with the pattern print layer portion 22B. The As a result, as described above, many fine recesses (not shown) appear on the surface portion in contact with the pattern print layer portion 22B. The surface portion in contact with the pattern print layer portion 22B that exhibits the uneven surface due to the presence of these recesses defines the matte surface.

Further, in the range where the pattern print layer portion 22A and the pattern print layer portion 22B overlap each other (polymerization range), the absorption effect of the pattern print layer portion 22B on the top coat 26 extends through the pattern print layer portion 22A. A plurality of fine recesses are also formed on the surface of the pattern print layer portion 22A. Here, since the absorption action from the pattern printing layer portion 22B is indirect, the number of these recesses is relatively small and the depth thereof is relatively shallow. For this reason, the said surface part from which the degree of irregular reflection differs mutually and the surface part in the said superposition | polymerization range arise. That is, three surface portions having different gloss levels, that is, a portion having the lowest glossiness (a portion in contact with the pattern print layer portion 22B), and a portion having a lower glossiness (a portion in contact with the pattern print layer portion 22A in the polymerization range) ) And the portion with the highest glossiness (the other portion) appears.

DESCRIPTION OF SYMBOLS 10 Hydraulic transfer sheet 12 Decorating object 16 Decorative film 18 Water-soluble film 20 Print layer 22 Picture print layer part 22A, 22B Picture print layer part 24 Solid print layer part 26 Top coat 28 Water tank 30 Water 32 Activator 34 Ionizing radiation 36 , 40 Surface part 38 Fine recess in the surface part

Claims (10)

A hydraulic transfer sheet,
A water-soluble film, and a printed layer formed on the water-soluble film,
The said printing layer is a sheet | seat for hydraulic transfer containing the resin which can absorb a part of topcoat formed so that it may cover on the surface of the said printing layer after a hydraulic transfer. The printing layer is composed of a pattern printing layer portion and a solid printing layer portion sequentially formed on the water-soluble film,
The hydraulic transfer sheet according to claim 1, wherein the resin is contained in all or part of the pattern print layer portion. The hydraulic transfer sheet according to claim 2, wherein all or part of the pattern printing layer is made of the resin. The hydraulic transfer sheet according to claim 2, wherein all or part of the pattern printing layer is made of the resin and the pigment. The printing layer comprises a pattern printing layer formed on the water-soluble film,
The hydraulic transfer sheet according to claim 1, wherein the resin is contained in a part of the pattern print layer portion. The hydraulic transfer sheet according to claim 5, wherein a part of the pattern printing layer portion is made of the resin. The hydraulic transfer sheet according to claim 5, wherein a part of the pattern printing layer portion is made of the resin and the pigment. A water pressure transfer method using the water pressure transfer sheet according to any one of claims 1 to 7,
Immersing the water-soluble film of the hydraulic transfer sheet in water;
Applying an activator that causes the printing layer to be adhesive on the printing layer of the hydraulic transfer sheet;
Under the action of water pressure on the water-soluble film, the hydraulic transfer sheet is adhered to the surface of the object to be decorated via the printing layer;
Removing the water-soluble film;
Forming a top coat covering the surface of the printed layer;
Then, the hydraulic transfer method including curing the top coat. The top coat is made of a resin that is cured by irradiation with ionizing radiation,
The hydraulic transfer method according to claim 8, wherein the top coat is cured by irradiating it with ionizing radiation. A decorative coating formed on the surface of a decoration object using the hydraulic transfer sheet according to any one of claims 1-7,
A printing layer of the hydraulic transfer sheet that is hydraulically transferred to the surface of the decoration target;
A top coat covering the surface of the printing layer,
The top coat defines a surface of the decorative coating, and the surface includes a surface portion generated by the absorption action of the resin and other surface portions.

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