JP4747309B2 - Molded decorative product that can be illuminated from the back - Google Patents

Description

  The present invention relates to a simultaneously molded decorative molded product that can be illuminated from the back surface.

Conventionally, decorative molded products that can be illuminated from the back side are designed and designed with emphasis on the fact that the pattern of the translucent part is brightly illuminated when illuminated and that the entire product exhibits a beautiful design when not illuminated. It was.
However, in recent years, when the light source is illuminated from the back side, the pattern of the translucent part is visible, but in the state where the light source is not illuminated from the back side, the pattern is assimilated with the surrounding light shielding part, and its existence cannot be understood. There is a demand for an illuminated decorative molded product that exhibits such a design.

  As such a decorative molded product, conventionally, the color difference between the non-illuminated translucent part and the light-shielding part is reduced to make the hue of similar colors, and the light transmittance between the translucent part and the light-shielding part is different. Is known (for example, see Patent Document 1).

JP 2001-347539 A

However, even if the color difference between the light-transmitting part and the light-shielding part is reduced to make the hues of similar colors, the color difference between the light-transmitting part and the light-shielding part when not illuminated may be visually recognized.
In such a case, assimilation can be easily achieved by reducing the light transmittance of the translucent layer, but the pattern of the translucent layer cannot be clearly discriminated when illuminated.

  On the other hand, if the illuminance of the back light source is increased, the pattern of the translucent layer can be clearly discriminated. However, in that case, a new problem of light leakage of the light shielding portion occurs. When the concealability is increased, there is a problem that the light transmitting portion and the light shielding portion are not assimilated again at the time of non-lighting.

Therefore, the present invention presents a design in which a pattern of a certain design is clearly visually recognized when illuminated from the back surface, and when the pattern is not illuminated from the back surface, the pattern is assimilated with the surrounding light-shielding portion and its presence is not known. It is an object to obtain a decorative molded product that can be illuminated and a method for producing the same.
Other problems of the present invention will become apparent from the following description of the present invention.

In order to solve the above-described problems, the present invention provides a light-transmitting decorative layer formed on at least the surface of the molded resin layer, forms a pattern with irregularities on the back surface of the molded resin layer, and the irregularities are different from each other. consists irregular shape, from said back surface to form a new pattern in the pattern a lighting capable mold decorating molded articles, the plurality of different irregularities, the front side back with respect to the rear surface of the reference plane It is a molded simultaneous decorative molded product that can be illuminated from the back surface, characterized by being provided alternately.

Further, the present invention provides a B mold in which a decorative sheet in which at least a translucent decorative layer is formed on a base sheet is installed on the A mold side, and a A mold and a desired uneven pattern portion can be formed. This is a method for producing a simultaneously molded decorative molded product obtained by closing the mold, injecting a molding resin, cooling and solidifying, and then opening the mold.
In the present invention, the decorative sheet includes a transfer sheet and an insert sheet.

The molded simultaneous decorative molded product that can be illuminated from the back surface of the present invention is characterized in that a translucent decorative layer is provided on the front surface and unevenness is provided on the back surface. Therefore, it is possible to present a design that obscure the presence of the uneven pattern on the back surface due to the translucent decorative layer provided on the front surface during non-lighting, and the pattern resulting from the unevenness during lighting is clear. Has the effect of being visually recognized.
Moreover, the manufacturing method of the simultaneous decoration decoration molded product of this invention has an effect which can provide a translucent decoration layer on the surface simultaneously with shaping | molding, and can provide an unevenness | corrugation in a back surface.

  The following examples further illustrate the simultaneously molded decorative molded product and the manufacturing method thereof according to the present invention. The dimensions, materials, shapes, relative positions, etc. of the members and parts described in the embodiments of the present invention are not intended to limit the scope of the present invention to those unless otherwise specified. It is merely an illustrative example.

FIG. 1 is a cross-sectional explanatory view illustrating an example of a simultaneously molded decorative molded product according to the present invention.
In the molded simultaneous decorative molded product 1 of the present invention, an adhesive layer 35, a translucent decorative layer 5, and a release layer 31 are sequentially provided on the surface side of the molded resin layer 2. Concavities and convexities 7 are provided in a desired pattern on the back side of the molded resin layer 2. In the figure, reference numeral 3 denotes a light source arranged on the back side of the simultaneously molded decorative molded product 1.

In other words, the pattern caused by the unevenness 7 is clearly discriminated by utilizing the phenomenon that light is transmitted differently between the portion where the unevenness 7 is formed and the portion where the unevenness 7 is not formed during illumination. can do. Furthermore, the unevenness 7 can also be formed with a plurality of uneven portions having different uneven shapes, and each uneven portion changes the way to reach the surface of the light, so that a new pattern is formed within the pattern of the unevenness 7. be able to.
Therefore, the molding simultaneous decorative molded product 1 of the present invention can obtain a desired illumination pattern by appropriately changing the position, pattern, and shape of the unevenness 7 on the back surface side.

Below, the manufacturing method of the shaping | molding simultaneous decorating molded product 1 of this invention is demonstrated. FIG. 2 is a cross-sectional explanatory view illustrating an example of a method for producing a simultaneously molded decorative molded product according to the present invention.
The simultaneously molded decorative molded product 1 is installed on the A mold 20 side using a transfer sheet 10 having at least a translucent decorative layer 5 formed on a base sheet 30 as a decorative sheet. 20 and the B mold 21 on which the desired concavo-convex pattern part 29 is formed are clamped, a molding resin is injected, and after cooling and solidifying, the mold can be opened and manufactured.

That is, by the molding simultaneous decorating method, the translucent decorating layer 5 is formed on the surface simultaneously with molding, and the unevenness 7 is formed on the back surface. Therefore, the molded simultaneous decorative molded product 1 of the present invention can be obtained in almost the same process as the manufacturing process of the conventional molded simultaneous decorated molded product.
In the above, as a method for forming the unevenness 7, a method has been shown in which a desired uneven pattern portion 29 is provided in the B mold 21 and the back surface of the molded resin layer 2 is uneven at the same time as molding. A method may be used in which a prototype body is prepared, the prototype body is inserted into the inner surface of the mold, and the back surface of the molded resin layer 2 is formed into irregularities by the irregularities of the prototype body.
Moreover, the method of obtaining the shaping | molding simultaneous decoration molded product in which the translucent decoration layer 5 was formed previously, and forming the unevenness | corrugation 7 by methods, such as potting, after that may be sufficient.

  As the molded resin layer 2, acrylic resin, acrylonitrile styrene resin, styrene resin, polycarbonate resin, acrylonitrile butadiene styrene resin, silicon resin, nylon resin, urethane resin, thermoplastic elastomer resin, polyethylene resin, polypropylene resin, etc. can be used. Any of them has translucency.

Next, an example of a transfer sheet installed on the A mold 20 side of the present invention will be described.
FIG. 3 is a cross-sectional explanatory view for explaining an example of a transfer sheet for producing a molded simultaneous decorative molded product according to the present invention. The transfer sheet 10 is obtained by sequentially laminating a release layer 31, a translucent decorative layer 5, and an adhesive layer 35 on a base sheet 30 on which a release layer 39 is formed.
After the transfer sheet 10 is bonded to the molded resin layer 2, the base sheet 30 and the release layer 39 are peeled and removed, and a laminate of the release layer 31, the translucent decorative layer 5, and the adhesive layer 35 is formed into the molded resin layer. 2 is obtained.
Note that the release layer 39 may be omitted when the base sheet 30 has releasability, and the adhesive layer 35 may be omitted when the translucent decorative layer 5 has adhesiveness.

  The base sheet 30 is made of polypropylene resin, polyethylene resin, polyamide resin, polyester resin, acrylic resin, polyvinyl chloride resin, polycarbonate resin, polyurethane resin, polystyrene resin, acetate resin, polyamide resin. Resin sheets such as aluminum foil, copper foil, cellulose sheets such as glassine paper, coated paper, cellophane, and sheets in which these are combined are preferable.

The film thickness of the base sheet 30 is preferably 5 μm to 5 mm. When the film thickness is within this range, the sheet has appropriate rigidity, and thus a transfer layer such as the translucent decorative layer 5 can be suitably supported. Further, since the sheet has an appropriate rigidity, the sheet can be easily handled.
When the synthetic resin or the like is used as a material, the base sheet 30 can be formed by a general-purpose sheet manufacturing method such as extrusion molding, calendar molding, or casting. In addition, the base sheet 30 may be subjected to easy adhesion treatment such as corona discharge treatment, plasma treatment, and easy adhesion primer coating on the surface on which the respective layers are formed as necessary.

Examples of the material of the release layer 39 include melamine resin, silicon resin, fluorine resin, alkyd resin, phenol resin, and the like. A preferable material is appropriately selected depending on the release property from the release layer. select.
As the material of the release layer 31, acrylic resin, vinyl resin, urethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide resin A resin or the like can be used, and a preferable material is appropriately selected according to the peelability from the release layer 39.

The method for forming the release layer 39 and the release layer 31 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or coating (for example, using a reverse coater).
The film thickness of the release layer 39 and the release layer 31 is preferably 0.5 μm to 50 μm. When the film thickness is within this range, it is possible to obtain an appropriate releasability or releasability, and it becomes easy to dry after forming these layers.

  Examples of the material of the translucent decorative layer 5 include polyester resins, acrylic resins, vinyl resins, nitrified cotton resins, urethane resins, chlorinated rubber resins, and ordinary pigments and dyes. Although what contained the coloring agent in a small amount can be mentioned, it is not specifically limited. It can also be made of metal films such as metals such as aluminum, nickel, gold, platinum, chromium, iron, copper, tin, indium, silver, titanium, lead, zinc, tin, silicon oxide, alloys or compounds thereof. Good.

When the material of the translucent decorating layer 5 is a resin or the like, the method of forming the translucent decorating layer 5 can be a method such as gravure printing, offset printing, or screen printing. In the case where the translucent decorative layer 5 is formed of a metal film, examples of the forming method include plating, vacuum deposition, sputtering, and ion plating.
When the material of the translucent decoration layer 5 is resin etc., the film thickness of the translucent decoration layer 5 is preferably 0.5 μm to 5 μm. It is because sufficient designability and translucency can be obtained when the film thickness is within this range. In the case of a metal film, the thickness of the translucent decorative layer 5 is preferably 50 to 500 mm. This is because when the film thickness is within this range, a uniform film can be formed, and appropriate translucency can be obtained.

  The material of the adhesive layer 35 is acrylic resin, vinyl resin, urethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide resin. Resin can be mentioned and a preferable material is appropriately selected according to the adhesiveness with the molded resin layer 2.

As a method for forming the adhesive layer 35, various printing methods such as gravure, offset, and screen can be used, and coating methods such as gravure coating, reverse coating, roll coating, comma coating, and lip coating may be used. Also, methods such as painting and dipping may be used.
The film thickness of the adhesive layer 35 is preferably 0.5 μm to 10 μm. This is because when the film thickness is within this range, sufficient adhesion can be obtained, and the layer after the adhesive layer is formed can be easily dried.

  In addition, although the example of the transfer sheet was shown especially so far, the insert sheet in which the base sheet 30 remains on the molded resin layer 2 after bonding to the molded resin 2 instead of the transfer sheet is used as a decorative sheet. It may be used to form the molded simultaneous decorative molded product 1. The insert sheet may be formed in the same manner as the transfer sheet 10 except that the release layer 39 and the release layer 31 of the transfer sheet 10 are omitted.

  The transfer sheet 10 and the insert sheet may be preformed by a mold pressing method, a pressure press method, a vacuum forming method, or the like before being installed in the mold, or before being clamped in the mold. Preliminary molding may be performed by a method of vacuum suction from a mold cavity. Further, in order to perform positioning within the mold, marking by printing may be performed, or positioning holes may be provided by punching with a Thomson mold.

  Next, the unevenness | corrugation 7 formed in the back surface of the translucent decorating layer 5 of the shaping | molding simultaneous decorating molded product 1 of this invention is demonstrated. The light from the back light source transmits, refracts, and reflects light different from the flat surface by the plurality of projections and depressions 7. For example, the hemispherical irregularities act similarly to the lens. In addition, each surface of the polygonal pyramid unevenness acts as a refracting surface and a reflecting surface. For this reason, the traveling direction of the light from the back surface light source changes in the uneven portion, and the intensity of light per unit area changes on the surface. If an example of the result of such an uneven | corrugated effect | action is given, when illuminated by a back side light source, the shape of the unevenness | corrugation 7 may float on the surface.

In FIG. 1, the irregularities 7 are formed by hemispherical irregularities 70 and pyramidal irregularities 71. By appropriately arranging the hemispherical uneven part 70 and the pyramidal uneven part 71, it is possible to change the pattern observed from the surface side during illumination.
As the shape of the unevenness 7, in addition to the hemispherical uneven portion 70 and the pyramidal uneven portion 71, an arbitrary shape such as a shape of a part of an elliptical sphere, a cylinder, a polygonal column, a truncated cone, or a truncated pyramid is selected. These can also be combined.

FIG. 5 is a cross-sectional view showing an example of unevenness of a molded and simultaneously decorated molded product. In FIG. 5, the same parts as those in FIG.
The unevenness 7 may be provided alternately on the front and back sides with respect to the reference surface 72 on the back surface, for example, as shown by the portion 73. Further, as shown in the portion 74, a small area unevenness may be provided in a large area unevenness. Further, as shown in a portion 75, the surface may be provided by digging from the reference surface 72 toward the front side.
The size of one unevenness can be arbitrarily determined. The size of one unevenness is preferably 0.3 mm or more, more preferably 0.5 mm, when the bottom surface of the unevenness is projected on the reference surface (or virtual reference surface) on the back surface and expressed by the diameter of the circumscribed circle of the projection surface. That's it. This is because when the diameter is 0.3 mm or more, the uneven pattern is easily recognized at the time of illumination, the design effect is enhanced, and when the diameter is 0.5 mm or more, the uneven pattern can be easily formed on the mold.

  The material of the concavo-convex 7 is the same as that of the molding resin 2 when a desired concavo-convex pattern portion 29 is provided on the B die 21 and the back surface of the molding resin layer 2 is concavo-convex simultaneously with molding. Examples of the resin used when the unevenness 7 is obtained by a method such as potting include acrylic resins, urethane resins, polyester resins, epoxy resins, vinyl resins, nitrified cotton resins, and chlorinated rubber resins. Can do.

On a 38 μm thick polyethylene terephthalate film, a release layer is formed by a gravure printing method using a transparent ink made of a melamine resin, and then a release layer is successively formed by a gravure printing method using a transparent ink made of an acrylic resin. did.
Next, a translucent decorative layer is formed by a gravure printing method using a transparent ink containing a pearl pigment, and then a solid pattern adhesive layer is formed on the entire surface using a transparent ink made of vinyl chloride-vinyl acetate resin. A transfer sheet was obtained by gravure printing.

  On the other hand, a concavo-convex pattern composed entirely of N character patterns is formed on the B mold of the injection mold with a hemispherical concavo-convex shape group, and the concavo-convex pattern is formed with a quadrangular pyramid-shaped concavo-convex shape group on the inner periphery thereof. Formed. The size of the single concavo-convex portion was 5 mm in terms of the diameter of the circumscribed circle described above.

  After the transfer sheet was placed in the A mold of the injection mold and clamped with the B mold, acrylonitrile butadiene styrene molding resin “Toyolac 920” manufactured by Toray was injected, cooled and solidified, and taken out. A simultaneously molded decorative molded product (1) was obtained in which a decorative layer was formed on the surface of the molded resin and irregularities were formed on the back surface.

Drawing 4 is an explanatory view explaining the design pattern at the time of illumination of a molding simultaneous decoration molded product (1).
In this molded simultaneous decorative molded product (1), when illuminated from the back side by a light source, a bright pattern with N letters formed is lifted, and the inner periphery of the N letters has a grid-like light and dark pattern. I was able to recognize it clearly. When not illuminated by a light source, the whole had a pearl luster design.

A vapor deposition anchor layer was formed on a polycarbonate film having a thickness of 50 μm by gravure printing using an ink of acrylic two-component curable resin.
After heat-treating this at 180 ° C. × 30 seconds / m, a translucent decorative layer made of aluminum having a thickness of 200 ± 50 mm was formed on the entire surface by vacuum deposition. Next, an adhesive layer was formed by a screen printing method using a vinyl chloride resin ink to obtain an insert sheet.

When this insert sheet is placed in the A mold, polycarbonate molding resin “Taflon IR1700” made by Idemitsu Petroleum is injected, cooled, solidified, and taken out. Simultaneous molding with a transparent decorative layer formed on the surface is performed. A decorative molded product (2) was obtained.
Next, a plurality of hemispherical irregularities with a diameter of about 2 mm were formed by potting with a cyanoacrylate resin on the back surface of the simultaneously molded decorative molded product (2) to form the letter N. Thereafter, ultraviolet rays were irradiated to cure the unevenness.

In this simultaneously molded decorative molded product (2), the letter pattern of N was lifted and could be clearly recognized when illuminated from the back by a light source. When not illuminated by a light source, the whole exhibited a silver-white metallic design.

  The molded simultaneous decorative molded product according to the present invention is used for panel members used for communication equipment, lighting equipment, home appliances, information equipment, housing equipment, office equipment, automobile parts, and the like.

It is sectional explanatory drawing explaining the shaping | molding simultaneous decorating molded product which concerns on this invention. It is sectional explanatory drawing explaining the manufacturing method of the simultaneous decoration decoration molded product based on this invention. It is sectional explanatory drawing explaining the transfer sheet for manufacturing the shaping | molding simultaneous decorating molded article which concerns on this invention. It is explanatory drawing explaining the design pattern at the time of illumination of an example of the shaping | molding simultaneous decoration molded product which concerns on this invention. It is sectional explanatory drawing explaining the unevenness | corrugation of the shaping | molding simultaneous decoration molded product which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding simultaneous decoration molded product 2 Molding resin layer 3 Light source 5 Translucent decoration layer 7 Concavity and convexity 10 Transfer sheet 20 A mold 21 B mold 29 Concavity and convexity pattern part 30 Base sheet

31 Peeling layer 35 Adhesive layer 39 Release layer 70 Hemispherical uneven part 71 Pyramidal uneven part 72 Back reference surface 73 (Concavity and convexity) part 74 (Concavity and convexity) part 75 (Concavity and convexity) part

Claims (2)

A translucent decorative layer is formed at least on the surface of the molded resin layer, a pattern is formed by irregularities on the back surface of the molded resin layer, the irregularities have a plurality of different irregularities, and a new pattern is formed in the pattern a lighting can mold decorating molded article from the back surface to form a said plurality of different irregularities, characterized in that it is provided alternately on the front side back with respect to the back surface of the reference plane rear surface Simultaneously decorated molded product that can be illuminated from A decorative sheet in which at least a translucent decorative layer is formed on a base sheet is placed on the A mold side, and the A mold and a B mold capable of forming a desired uneven pattern are clamped, and a molding resin was injected, cooled and solidified, the back side from the illumination possible mold decorating molded article manufacturing method according to claim 1, characterized in that obtained by opening the mold.

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