JP2008183848A - Manufacturing method of operation panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an operation panel, which enables a change of colors of a display of the operation panel when an LED emits light, and when the LED does not emit light, and in which fluorescent pigments where visual effects can be expected are used. <P>SOLUTION: A printing is carried out on a back side of a film 12 to form a printing ink layer 20, and further a binder is printed lapping over the printing ink layer 20 to form a binder layer 30. Next, the film 12 is cut, a punching-out is carried out, and the punched-out film 12 is subjected to a forming for a periphery bending and a three-dimensional shaping by a press die. Finally, the film 12 subjected to the forming is set on a cabinet surface of an injection molding mold, a molten resin is injected in the mold after setting, and the binder layer 30 melts and becomes an adhesive to bond the ink layer 20 and a molding resin layer 40. In a light-emitting portion 50 of the operation panel, an ink for printing the film 12, in which a UV fluorescent pigment is added to an invisible ink is printed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to a method for manufacturing an operation panel.

  Conventionally, a display unit is caused to emit light by an LED on an operation panel of a washing machine or the like (see Patent Documents 1 and 2). However, the color of this part could not be changed when the LED was not emitting light.

Further, a molded body containing a fluorescent pigment, wherein an LED that emits ultraviolet light is disposed in the vicinity of or inside the molded body, and the fluorescent pigment is excited to emit light by the ultraviolet light emitted by the LED. A light-emitting molded body is known (see Patent Document 3).
JP-A-6-343792 JP 2001-29691 A JP 2004-103912 A

  However, the molded body containing the fluorescent pigment described above is formed by kneading the fluorescent pigment into plastic (for example, acrylic resin), and the fluorescent pigment is dispersed inside the molded body. Therefore, the color of the display unit of the operation panel cannot be changed.

  The present invention has been made in view of the above-described problems of the prior art, and allows the color of the display portion of the operation panel to be changed when the LED is not emitting light, and a visual effect is expected. It is an object of the present invention to provide a method for manufacturing an operation panel using a fluorescent pigment that can be produced.

  For this purpose, the operation panel manufacturing method of the present invention prints on the back surface of the film to form a printing ink layer, and further prints a binder on the printing ink layer to form a binder layer, and then the film. The die is cut and die-cut, and the die-cut film is bent to form the outer periphery with a press die and formed into a three-dimensional shape. Finally, the formed film is set on the mold surface of the injection mold. A method for manufacturing an operation panel in which a molten resin is injected into a mold later, the binder layer dissolves to become an adhesive, and the ink layer and the molded resin layer are bonded to each other. The ink is printed using an ink obtained by adding a UV fluorescent pigment to a transparent ink.

  When manufacturing an operation panel by film insert molding, by printing an ink in which a UV fluorescent pigment is added to a transparent ink on an ink for printing a film in a light emitting portion, for example, a transparent ink to which the fluorescent pigment is added is printed. If printed, it is white when extinguished, but when it is emitted by a UV LED, it can emit a desired color. The emission color can be red, blue, green, purple, or the like.

Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a plan view for explaining a printing process of the method for manufacturing an operation panel according to the embodiment of the present invention, FIG. 2 is a plan view for explaining a die-cutting process, FIG. 3 is a plan view for explaining a forming process, and FIG. FIG. 5 is an enlarged cross-sectional view of the outer peripheral side surface of the product of FIG. 4.

  First, as shown in FIG. 1, printing is performed on the back surface of a plastic film (hereinafter referred to as “film”) 10 to form a printing ink layer 20 (see also FIG. 5). The number of colors depends on the design of the operation panel. As the plastic film 10, a PET film is mainly used, but a PC (polycarbonate) film or the like may be used. The printing method is a silk screen method or an offset method.

  At this time, ink mixed with a fluorescent pigment is printed on the LED light emitting portion 50 of the operation panel (the start / stop button portion if the operation panel of the washing machine). Basically, it mixes with transparent ink, but if it is a transparent color, you can expect interesting effects with other colors. For example, when a blue fluorescent pigment is added to a yellow transparent ink, it is yellow when the light is turned off, but changes to green when light is emitted. Thereafter, other design portions are printed.

  Next, a binder is printed on the printing ink layer 20 to form a binder layer 30 (see FIG. 6). This is a molding resin adhesive, which melts by the heat of the molten resin during molding to form an adhesive, which bonds the printing ink surface to the molding resin surface. In addition, since the molding resin layer of the part which forms an embossed part with a press die in a forming process which will be described later becomes a through hole, it is desirable that the binder is not printed in this part.

  This completes the printing process, and then performs a cutting process (see FIG. 2). The cutting process is mainly performed by cutting with a Thomson die or a press die. By this process, the film 10 is cut into a desired size. As shown in FIG. 1, in most cases, printing is performed with a large number of pieces, so that several pieces of printing are performed on one film, and thus, in this step, the film 11 is cut into one piece.

  Next, the film 11 is formed (see FIG. 3). Specifically, the film is first preheated. The temperature at this time is about 160 ° C. After heating for several seconds, the film 11 is set in a press mold and pressed. This forms the outer peripheral bend and three-dimensional shape of the film. The embossed portion is also included in the three-dimensional shape. Forming is performed because the surface of the molded product is usually not flat and has a three-dimensional shape, so if insert molding is performed in the state of a flat film, the film is doubled in the mold, and the surface of the molded product is wrinkled. This is because. In order to prevent the generation of wrinkles, the film is formed before the forming step.

  Finally, film insert molding is performed (see FIG. 4). A film 12 bent at the outer periphery is set on the cavity surface of the injection mold. At this time, since the position of the film 12 is determined by the outer periphery bending in the previous step, positioning is not necessary. After setting, start molding. The molten resin is poured into the mold, the binder layer 30 is dissolved and becomes an adhesive, the ink layer 20 and the molded resin layer 40 are bonded and cooled, and the operation panel is completed after the molding is completed.

It is a top view explaining the printing process of the manufacturing method of the operation panel which concerns on embodiment of this invention. It is a top view explaining a die cutting process. It is a top view explaining a forming process. It is a top view explaining a formation process. It is an expanded sectional view of the outer peripheral side surface of the operation panel of FIG.

Explanation of symbols

12 Film 20 Printing ink layer 30 Binder layer 40 Molded resin layer 50 Light emitting portion

Claims (1)

Print on the back side of the film to form a printing ink layer, and further print a binder on the printing ink layer to form a binder layer,
Next, the film is cut and die-cut, the die-cut film is subjected to outer bending and three-dimensional forming with a press die,
Finally, a film formed on the mold surface of the injection mold is set, and after setting, the molten resin is injected into the mold, the binder layer dissolves and becomes an adhesive, and the ink layer and the molded resin layer are bonded. A method of manufacturing an operation panel
In the light emitting portion of the operation panel, the operation panel manufacturing method is characterized in that an ink for printing a film is printed and an ink obtained by adding a UV fluorescent pigment to a transparent ink.

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