JP2011005687A - Decorative panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative panel in which a gradation is visible on the panel surface without using the method of dot printing, and the gradation with a narrow interval of the contrast can be achieved.SOLUTION: This decorative panel 1 is equipped with a base material 2 and a sheet 3. The base material 2 is made of a colored and transparent resin, and the rear surface has an uneven shape. The permeability of light gradually changes depending on the uneven shape. The sheet 3 which has evenly be printed is bonded to the rear surface of the base material 2. Thus, when being seen from the surface side, recess sections look relatively bright, and protruding sections look relative dark, and therefore, the gradation is visible. If the uneven shape is formed at the narrow interval, the interval of the contrast of the gradation can be made narrower as well.

Description

  The present invention relates to a decorative panel.

  Various decorated panels are used in various products. Patent Document 1 below proposes a technique for printing a pattern on a panel by a dot (halftone dot) printing technique.

JP 2003-16561 A

  There is a gradation (gradual or continuous change in color, brightness or density) as a decoration for the panel. When realizing gradation by dot printing, increase the dots in dark areas (low brightness areas, high density areas), and decrease dots in bright areas (high brightness areas, low density areas) Printing is performed by adjusting the size of the dots so that the dots continuously change from a large area to a small area.

  However, when dots are used, if the dots themselves are viewed, the viewer may not be able to give a good gradation impression. Furthermore, there is a limit to rapidly changing the size of the dots. Therefore, when gradation is formed by dot printing, the distance (L in FIGS. 1 and 2 described later) between the bright and dark portions is made too small. Can not. Therefore, there is a problem that it is not suitable for dot printing to realize gradation with a narrow interval between light and dark. Today, however, there is no proposal for a method other than dot printing when gradation is applied to a panel.

  Therefore, in view of the above problems, the problem to be solved by the present invention is to provide a decorative panel in which gradation can be visually recognized on the panel surface without using a dot printing technique, and the gradation can have a narrow interval between light and dark. There is to do.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, the decorative panel according to the present invention has a plate shape, and the plate thickness smoothly and gradually changes so that one main surface is flat and the back surface of the main surface has an uneven shape, A base material that is formed of a colored transparent resin and whose light transmittance smoothly changes gradually as the plate thickness changes, and a curved plate shape that has the same uneven shape as the back surface of the base material, and the plate thickness is uniform. One surface is printed and bonded in close contact with the back surface of the base material, and the surface subjected to the printing by gradually changing the transmittance of the base material from the flat main surface side of the base material And a sheet visually recognized as gradation.

  As a result, in the decorative panel of the present invention, one main surface of the base material is flat, the back surface thereof is uneven, and a sheet printed on the back surface is joined to gradually change the light transmittance. The printed surface is visually recognized as a gradation. Therefore, if the uneven shape is formed at a narrow interval, gradation of a narrow interval can be easily realized. Also, since the dot printing method is not used, the viewer does not disturb the smooth gradation effect by visually recognizing the dots.

  The sheet may be bonded to the back surface of the substrate by insert molding.

  As a result, it is possible to save the trouble of masking a portion that does not require printing, for example, when printing directly on the back surface of the substrate. Therefore, it is possible to manufacture a decorative panel having a gradation visual effect while avoiding an extra manufacturing process and cost increase.

  The main surface of the sheet may be printed with a light-shielding ink that is uniformly printed.

  As a result, a decorative panel having a gradation visual effect can be manufactured without applying gradation to the printing itself, by simply joining a sheet that has been subjected to a simple operation of uniformly printing light-shielding ink to the back surface of the substrate. .

  Further, the uneven shape on the back surface of the base material is a periodic wave shape, and the region connecting the wave fronts and the region connecting the wave bottoms are striped patterns by gradation from the flat main surface side of the base material. It may be visually recognized.

  Thereby, the decorative panel which has the visual effect of a striped gradation can be implement | achieved easily by forming the back surface of a base material in a periodic wave shape. If the wave shape is formed at a narrow interval as described above, it is possible to narrow the light-dark interval in the striped pattern.

The perspective view of the decoration panel of the Example of this invention. XX sectional drawing of FIG. The figure explaining injection molding. The figure which shows the sheet | seat at the time of injection molding. The flowchart which shows the manufacture procedure of a decoration panel.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a decorative panel according to the present invention. FIG. 1A is a perspective view seen from the front side of the decorative panel, and FIG. 1B is a perspective view seen from the back side. FIG. 2 is a sectional view taken along line XX in FIG.

  As shown in these drawings, the decorative panel 1 (panel) includes a base material 2 and a sheet 3 (or film). The base material 2 includes a plate portion 20 and side surface portions 23 and 24. The plate portion 20 has a rectangular or square plate shape whose thickness changes, the main surface 21 (front surface) is flat, and the back surface 22 has an uneven shape (the main surface is a three-dimensional surface as is well known). Refers to the surface with the largest area). The plate thickness of the plate portion 20 changes smoothly (continuously).

  In the example of FIG. 1, the concavo-convex shape is a wave shape, and the region connecting the wave front (the highest point of the waveform) and the region connecting the wave bottom (the lowest point of the waveform) alternate with the regions parallel to the side surface portion 23. Form. The wave shape is regularly formed such that the distance between adjacent wave fronts and the distance between adjacent wave bottoms are both L. Thus, the plate | board thickness changes smoothly (it changes gradually), and the transmittance | permeability of light also changes gradually for every position of the base material 2. FIG.

  The side surface portions 23 and 24 are formed by being folded back so as to be orthogonal to the main surface 21 at the peripheral edge portion of the plate portion 20. A plurality of through holes 24 a are formed in the side surface portion 24 and used for fixing the panel 1 to various products. The material of the substrate 2 may be a colored transparent resin. Examples of the resin include acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate (PC), polystyrene (PS), acrylonitrile styrene copolymer (AS), polyethylene terephthalate (PET), and acrylonitrile butadiene styrene copolymer (ABS). And it is sufficient. The base material 2 is manufactured by injection molding. The manufacturing procedure will be described later.

  The sheet 3 includes a plate part 30 and a folded part 31. The plate part 30 has the same wave shape as the back surface 22 of the plate part 20, but is a curved plate member having a constant plate thickness. The folded portion 31 is formed by folding back from the end portion of the plate portion 30 in contact with the side surface portion 23 so as to be parallel to the side surface portion 23. The thickness of the plate part 30 may be in the range of 0.15 mm to 0.188 mm, for example. Assume that the sheet 3 is uniformly printed. The sheet 3 may be a transparent resin film, for example, and may be made of, for example, polyethylene terephthalate (PET), polycarbonate (PC), or polymethyl methacrylate (PMMA).

  In the finished panel 1, the sheet 3 is bonded to the back surface 22 of the base material 2 and the folded portion 31 is closely bonded to the side surface portion 23 without any gap. As described above, the light transmittance of the base material 2 gradually changes (continuously changes) with respect to the position due to the uneven shape. As a result, when viewed from the front surface 21 side, the printed surface of the sheet 3 looks relatively dark at the thick portion of the substrate 2 and the printed surface of the sheet 3 is relatively thin at the thin plate portion. It will look bright. And brightness changes continuously in the area in between. Therefore, the viewer recognizes gradation on the surface 21 of the panel 1. In the panel 1 of FIG. 1, the area | region of the sheet | seat 3 which opposes the wave head and wave bottom part of the base material 2 will be visually recognized as a parallel stripe pattern by gradation.

  In particular, since the base material 2 is colored, it is difficult for the viewer to visually recognize the uneven shape, the presence of the sheet 3 and the like, and only the gradation of the surface 21 can be impressed. The color of the substrate 2 may be arbitrarily determined such as blue, red, green, yellow, black, and the like. The panel 1 can be used for a part of a housing of various home appliances such as a washing machine, an air conditioner (air conditioner), an air purifier, and a panel part of an automobile.

  Next, a method for manufacturing the panel 1 will be described. The panel 1 is manufactured by injection molding as described above. FIG. 3 shows a mold used during injection molding. FIG. 4 shows the sheet 3 used during injection molding.

  The mold 4 shown in FIG. 3 includes a mold 4a disposed on the upper side and a mold 4b disposed on the lower side. FIG. 3 shows a state in which the mold 4a is lowered onto the mold 4b. In this state, a gap 5 is formed between the mold 4a and the mold 4b. The same wave shape as that of the sheet 3 is formed on the mold 4b, and the sheet 3 is set in this portion without any gap.

  As shown in FIG. 4, the sheet 3 to be set has an extension portion 32 formed from one end of one folded portion 31. A hole 33 is formed in the extension 32, and the pin 41 formed in the mold 4b is inserted into the hole 33, and the sheet 3 is positioned.

  In the gap 5, the gate portion 40 is formed continuously from the space where the base material 2 is formed. The gate portion 40 is a gap space formed above the extension portion 32 of the sheet 3. An injection port 6 is arranged in connection with the gate portion 40. Insertion molding is performed in which the sheet 3 (or film) is inserted into the back side of the molded product (film back) by injecting the molten resin from the injection port 6 into the gate portion 40 and further into the gap 5. Is done. Then, the injected resin is cooled and solidified, whereby the base material 2 joined integrally with the sheet 3 is formed.

  FIG. 5 is a flowchart showing a more detailed manufacturing procedure of the panel 1. In this step, first, in step S10, printing is performed on one surface of the transparent resin film that finally becomes the sheet 3. The printing method may be silk printing, screen printing or offset printing. The ink is suitable for the gradation effect if it is uniformly printed as a metal tone (metal tone) light-shielding ink. The ink may be, for example, urethane two-component curable ink.

  In step S20, a binder is further printed on the ink printed in step S10. This plays a role of bonding between the resin injected at the time of injection molding in S70 described later and the sheet 3. Next, a positioning hole (hole 33) is formed through the sheet 3 in S30. Next, in step S40, the transparent resin film subjected to the processing in steps S10 to S30 is subjected to die cutting with, for example, a Thomson blade into a shape in which the sheet 3 shown in FIG. 4 is obtained.

  Next, in S50, the sheet 3 obtained in S40 is formed into the shape shown in FIG. Forming may be, for example, press drawing, vacuum forming or pressure forming. In the press drawing process, the resin film is heated in advance from about 130 degrees Celsius to about 190 degrees Celsius, and this is pressed and formed using a drawing die. In vacuum forming, the resin film is heated, placed so as to cover the concave portion of the mold, air is sucked from the concave portion, and the film is pulled by a vacuum force to be brought into close contact with the inner wall of the concave portion. In pressure forming, a film is formed by simultaneously performing pulling with vacuum and pressing with air, where vacuum forming is only pulling with vacuum.

  Next, in S60, the sheet 3 obtained in S70 is set in the mold 4b as described above. In S70, injection molding is executed as described above. A colorant (pigment) is kneaded into the resin to be injected so that the final substrate 2 of the panel 1 is colored and transparent. In step S80, the extension portion 32 and the resin bonded to the extension portion 32 (and a portion unnecessary for the finished panel 1) are removed. The above is the manufacturing procedure of the panel 1.

  In the panel 1 of the said Example, it is possible to deform | transform so that it may print on the back surface 22 of the base material 2, without using the sheet | seat 3, for example. However, in that case, an extra process such as masking a portion that does not require printing is required, leading to deterioration in work efficiency and an increase in cost. On the other hand, the panel 1 uses the sheet 3, so that such a problem does not occur.

  Moreover, in the said Example, the folding | returning part 31 is arrange | positioned so that the type | mold 4b may be clamped, and also the position of the sheet | seat 3 at the time of injection molding is fixed reliably by inserting the pin 41 in the hole 33. Further, since the sheet 3 at the time of injection molding has the extension portion 32, even if the sheet 3 rolls up due to the influence of the resin injected at the time of injection molding, the sheet 3 is stored in the gate portion 40. Therefore, it is possible to suppress the occurrence of a problem that the resin adheres to the surface exposed to the outside of the sheet 3 of the panel 1 when completed (the surface on the lower side in FIG. 2).

  In the above embodiment, the sheet 3 is printed uniformly, but characters, designs, patterns, etc. may be printed on the sheet 3. In this case, a panel having a more excellent visual effect can be realized by combining characters, designs, patterns and the like with the gradation effect. Moreover, in the base material 2 and the sheet 3 in FIG. 1, the corrugated head and the wave bottom form a straight line, but the wave head and the wave bottom have other geometric shapes such as a curve, a circle, and an ellipse. Polygons (triangles, quadrangles, pentagons, hexagons, etc.), stars, or combinations thereof may be formed. In that case, various decorative properties can be realized.

DESCRIPTION OF SYMBOLS 1 Decorative panel 2 Base material 3 Sheet 4 Type 5 Cavity 6 Injection port 31 Folding part 32 Extension part

Claims (4)

It has a plate shape, and its thickness is smoothly and gradually changed so that one main surface is flat and the back surface of the main surface has an uneven shape, and is formed of a colored transparent resin. A substrate whose rate changes smoothly and slowly,
The curved plate shape having the same uneven shape as the back surface of the base material, the plate thickness is uniform, printed on one surface and closely adhered to the back surface of the base material, A sheet on which the surface subjected to the printing by gradual change of transmittance is visually recognized as a gradation from the flat main surface side of the substrate;
A decorative panel characterized by comprising.   The decorative sheet according to claim 1, wherein the sheet is bonded to the back surface of the base material by insert molding.   3. The decorative panel according to claim 1, wherein the main surface of the sheet is printed with a light-blocking ink uniformly. The uneven shape on the back surface of the substrate is a periodic wave shape,
The decorative panel according to any one of claims 1 to 3, wherein a region connecting the wave fronts and a region connecting the wave bottoms are visually recognized as a stripe pattern by gradation from the flat main surface side of the base material.

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