JPH01249336A - Plastic molded object for indication and its manufacture - Google Patents

Abstract

PURPOSE:To contrive to improve visual recognizability of indication in two faces of light reflection on the front and light transmission from the back face by forming a colored semitransparent thin layer on the front end surface of a protrusion for indication-position and on the front surface of its peripheral part. CONSTITUTION:In the molded object for indicating index and letter, etc., the transparent core 2' having a protrusion 1', as the position suitable for indicating letter and symbol on its front, is primarily molded by injection molding from plastic material by using the mold for two color molding. After mold opening, in the state where the core 2' is being attached to a core mold, the thin layer 4' of milky color or other semitransparency is molded on said core so that the front end surface of the protrusion 1' and the front of the peripheral surface are covered. In the state where the ore 2' is being attached to the core mold, new space is provided in between the core 2' and the cavity for secondary molding at the position of secondary molding, and the mold is clamped. The covering body 3' composed of the colored plastic molded object covering the front side of the core 2' except the front end surface of the protrusion 1', is secondarily molded on the core 2' by injection molding from the plastic material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to display plastic molded products, such as panels for computers, stereos, tape recorders, televisions, video tape recorders, car radios, etc., and buttons and levers used to operate them. This invention relates to display plastic molded products, such as knobs, which are partially transparent and used to display indexes, characters, and the like.

BACKGROUND TECHNIQUES AND THEIR PROBLEMS Hitherto, two-color molding methods and laser marking methods have been known as methods for manufacturing this type of plastic molded products for display purposes.

The two-color molding method involves primary molding of a transparent or colored plastic molded product that has a protrusion on the front surface that corresponds to the display area.
This is a method in which a colored covering portion is secondarily molded onto the primary molded product, except for the back surface of the primary molded product and the front surface of the protrusion. In the products obtained by this method, if the primary molded product is transparent, the visibility of the display part is poor, and if it is colored, the transparency of light from the back of the display part is reduced due to the primary molded product, There is a problem that visibility is not sufficient.

1 Noza marking method: (a) Paint white on the transparent plastic molded product, apply vacuum plating on top,
Further, a laser beam is applied to the black coating layer of a semi-finished product made by coating black or the like on top of the semi-finished product, or a semi-finished product made by coating black or the like on a transparent plastic molded product, and then the laser beam is applied to the black coating layer to produce characters, symbols, etc. (b) Applying transparent coating to a white plastic molded product, applying vacuum plating on top of that, and then applying black coating on the semi-finished product. (C) forming a hole in the center of the front surface and forming a milky white layer on the back side to fill the hole; A black, etc., plastic molded product is formed with a transparent layer on the back side through a white layer in such a way that the holes are filled in, and a black, etc., paint is applied to the plastic molded product, and a laser beam is applied to the black, etc., paint on the hole portion of this plastic molded product. This is a method of laser marking characters, symbols, etc. Products produced by these methods are
When the surface coating, such as black, peels off due to abrasion, light from the back side leaks through the peeled areas, making it difficult to see the display, which is a common problem. Furthermore, methods (a) and (b) involve a large number of steps and have the problem of frequently producing defective products.

An object of the present invention is to provide a plastic molded product for displays that has good visibility of characters, symbols, etc. in terms of light reflection from the front and light transparency from the back, and a method for manufacturing the same. It is in.

Means for Solving the Problems The above objects of the present invention are achieved by a plastic molded product for display and a method having the following configuration.

1. A core body made of a transparent or translucent plastic molded product having a protrusion on the front surface corresponding to the display, and a colored plastic molded on the core body except for the back surface of the core body and the front surface of the above-mentioned protrusion. 1. A plastic molded product for display, comprising a covering body made of a molded product, and a colored translucent thin layer formed on at least the front end surface of the protrusion and the front surface of the peripheral surface portion of the core body.

2. A core body made of a transparent or translucent plastic molded product having a protrusion on the front surface corresponding to the display, and a colored plastic molded on the core body except for the back surface of the core body and the front surface of the above-mentioned protrusion. A method for producing a plastic molded product for display, comprising a covering body made of a molded product, and a colored translucent thin layer covering at least the front end face of the protrusion and the front surface of the peripheral surface portion of the core body, the core body and The covering body is molded by a two-color molding method, and during the molding,
Display plastic molding characterized in that secondary molding is performed after forming a colored translucent thin layer on at least the front end surface of the protrusion and the front surface of the peripheral surface of the core body on the core mold after primary molding. method of manufacturing the product.

3. A core body made of a transparent or translucent plastic molded product having a protrusion on the front surface corresponding to the display, and a colored plastic bonded and molded onto the core body except for the back surface of the core body and the front surface of the protrusion. A method for producing a plastic molded product for display, comprising a covering body made of a molded product, and a colored translucent thin layer covering at least the front end face of the protrusion and the front surface of the peripheral surface portion of the core body, the core body and The covering body is molded by a two-color molding method, and during the molding,
A colored translucent thin layered insert is applied to a portion of the core body corresponding to at least the front end surface and peripheral surface of the protrusion in the cavity on the primary molding side, and primary molding is performed, and then secondary molding is performed. Manufacturing method for plastic molded products.

Effects In the present invention according to configuration 1 above, the front surface of the protrusion serving as the display area of the product is covered with a colored layer, so that the light reflectivity on the front surface is improved. Furthermore, since the colored layer on the front surface of the protrusion is translucent and thin, the light transmittance from the back surface through the core body made of a transparent or translucent plastic molded product is also good.

In addition, since the circumferential surface of the protrusion is covered with a colored layer, if the protrusion is of the Taber type, the colored layer on the circumferential surface of the protrusion serves to reflect light from the back surface that passes through the core body and passes through the protrusion. do. Therefore, the brightness of the protrusion is increased due to the transmission of light from the back surface. This means that the product of the present invention is highly useful in view of the fact that since the core body is made of a plastic molded product, it is convenient to form the protrusion into a tapered shape for molding.

As described above, the product of the present invention has good light reflectivity on the front surface of the protrusion that serves as the display part for characters, symbols, etc., and light transmittance from the rear surface, so that good visibility of the characters, symbols, etc. can be obtained. It will be done.

In the present invention of configuration 1, the fact that the colored plastic covering is formed on the core body except for the back surface of the core body and the front surface of the protrusions makes the characters, symbols, etc. displayed by the protrusions stand out in appearance, Visibility can be effectively improved due to good light reflection on the front side of the protrusion and good light transmission from the back side.

The product of the present invention has a core body made of a plastic molded product,
The structure in which a covering body made of a plastic molded product is bonded and molded on the core body means that the layer around the protrusion of the core body is protected from the front and rear sides by the core body and the covering body, and the layer is The above-mentioned light reflectivity is made permanent.

As described above, in the present invention of configuration 2, a transparent or translucent plastic core body having a display-equivalent portion on the front side is primarily formed, and a predetermined portion of the core body on the core mold after the primary formation is colored with half-color. The display plastic molded product is manufactured by a two-color molding method in which a transparent thin layer is formed and then a colored plastic covering is secondarily formed on the core body, except for a predetermined part. This ensures that the product of the present invention with the desired characteristics can be obtained with high productivity.

As described above, in the present invention of configuration 3, a transparent or translucent plastic core body having a protrusion on the front surface as a display-corresponding part is primarily molded, and a part of the cavity on the side of the primary molding corresponds to a predetermined part of the core body. Display plastic is produced by a two-color molding method in which a colored translucent thin layered insert is first molded onto the core body, and then a colored plastic covering is second molded on top of the core body, except for a predetermined part. Since a molded article is produced, the product of the present invention having the above-mentioned properties can be obtained with high productivity.

Effects of the Invention As described above, the present invention provides a plastic molded product for display, which has good visibility of characters, symbols, etc. in terms of light reflection from the front and light transmission from the back. We can provide a manufacturing method for this.

Example Next, embodiments of the present invention will be described with reference to the accompanying drawings.

The embodiment of the present invention having configuration 1 is shown in FIG.
The embodiment of the invention in configuration 2 is shown in Figure 5.6, and in configuration 3 in Figure 5.6.
Embodiments of the invention are shown.

The products of the invention shown in FIG.
) is attached. The product (A) consists of a core body (2) made of a transparent or translucent plastic molded product having a protrusion (1) on the front surface that corresponds to displaying characters, symbols, etc., and a covering body made of a colored plastic molded product. (3),
The core body (2) is bonded and molded except for the back surface and the front surface of the projection (1), and a thin layer (4 ). Several layers (4) are milky white or other colored translucent. The thickness of the several layers (4) can be varied within a wide range, but is generally preferably from several microns to several hundred microns. The translucency of the several layers (4) can be varied over a wide range depending on the brightness of the light source, but in general, the light transmittance is 2.
It may be arbitrarily selected with a degree of ~98%.

In Fig. 2, (2') is a core body made of a transparent or translucent plastic molded product, and this core body (2') has protrusions (1) on the front surface that correspond to displaying characters, symbols, etc.
′). The core body (2') made of a transparent plastic molded product with the protrusion (1') is molded into plastic under the application of a two-color mold (not shown) having a molding cavity suitable for molding the core body. Primary molding is performed using injection molding from the material. Examples of the plastic material include ABS
Resin, AS resin, acrylic resin, polycarbonate resin, styrene resin, polyacetal, polypropylene,
Examples include vinyl chloride, nylon, silicone rubber, modified resins, copolymers, and blends thereof.

After the above primary molding, the mold is opened, and the core body (2') resulting from the primary molding is left attached to the core mold.
), a thin layer (4) is applied thereon by coating by roll printing, pad printing, painting, etc., or by transferring a film by hot stamping, so as to cover at least the front end surface and peripheral surface of the projection (1'). ') (Figure 3). Several layers (4') are milky white or otherwise translucent. The thickness and translucency of the several layers (4') can be the same as those of the layer (4) in the embodiment of the invention of configuration 1 described above. Examples of the coating material forming the layer (4') include alkyd resin, epoxy resin, unsaturated polyester resin, saturated polyester resin, acrylic resin, melamine resin, urea resin, urethane resin, silicone resin, phenol resin, and xylene resin. Examples include resins, maleic acid resins, polybutadiene resins, diallyl phthalate resins, Fehr resins, silicone resins, vinyl acetate resins, polyarylate resins, polyamideimide resins, polyimide resins, modified resins, copolymers or blends thereof, etc. can.

Examples of the film forming the layer (4') include polyethylene resin, polypropylene resin, vinyl chloride resin, polyimide resin, polyester resin, polycarbonate resin, polystyrene resin, acrylic resin, urethane resin, phenol resin, epoxy resin, and melamine resin. , films of modified resins, copolymers, or blends of these.

The core body (2') made of a transparent or translucent plastic molded product on which the layer (4') is formed at a predetermined portion is still attached to the core mold, and the core body (2') is still attached to the core mold at the point of secondary molding. ) and the cavity (not shown) of the secondary molding, the mold is clamped, and colored to cover the front side of the core body (2') excluding the front end surface of the protrusion (1'). A covering body (3') made of a plastic molded article is second-molded on the core body (2') from a plastic material by injection molding.

As the plastic material for this secondary molding, for example, AB
S resin, AS resin, styrene resin, acrylic resin, polycarbonate resin, polyacetal resin, polypropylene, vinyl chloride resin, silicone rubber, fluorine resin,
Modified resins, copolymers, blends, etc. of these can be mentioned.

In this way, the protrusion (1
A core body (2') made of a transparent or translucent plastic molded product having a front face with A display plastic molded article (A') (FIG. 4) is obtained, which is provided with a colored translucent thin layer (4') covering a predetermined portion of the core body (2').

In FIG. 5, (2') is a core body made of a transparent or translucent plastic molded product, and the core body (2') has a protrusion (I) on the front surface that corresponds to displaying characters, symbols, etc.
′). of the core body (2') in the cavity on the primary molding side of a two-color molding mold (not shown) having a molding cavity suitable for molding the core body (2') with the protrusion (1'). At least the portion corresponding to the front end surface and peripheral surface of the protrusion (1') is coated with paint,
Alternatively, a thin layered insert is applied by transferring a film using a hot stamping method. The insert is opalescent or otherwise colored and translucent. The thickness and translucency of the layered insert are as low as the layer (4) in the embodiment of the invention of configuration 1.
), and the coating material and film forming the layer may be the same as those described in the embodiment of the present invention of configuration 2.

A core body (2') made of a transparent or translucent plastic molded product with protrusions (1') is made from a plastic material by applying the above-mentioned two-color molding die in which a thin layer-like insert of the above-mentioned coating or film is applied to a predetermined area. Primary molding is performed by injection molding [Figure 5]. The plastic material may be the same as that described in the second embodiment of the present invention.

After the above primary molding, the mold is opened, and the core body (2') with the thin layer (4') made of the above insert is attached to the core mold by blow molding, and then the secondary molding is performed. At this point, a new space is created between the core body (2') and the cavity (not shown) of the secondary molding, the mold is clamped, and the core body (2') excluding the front surface of the protrusion (1') is removed. ) is a colored plastic molded covering (3″′) that covers the front side of the
) is second-molded onto the core body (2') from a plastic material by injection molding. As the plastic material for the secondary molding, the same material as that described in the embodiment of the present invention can be cited as an example.

Thus, a core body (2') made of a transparent or translucent plastic molded product having a protrusion (1'') as a part corresponding to displaying characters, symbols, etc. on the front surface, and a core body (2') made of a transparent or translucent plastic molded product, and a predetermined position on the core body (2'). A display plastic molded product comprising a covering body (3') made of a colored plastic molded product joined and molded except for the parts, and a colored translucent thin layer (4') covering a predetermined part of the core body (2'). (A') [Figure 6] is obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention having configuration 1 (claim 2). Figures 2 to 4 are configuration 2 (claim ■
), FIG. 1 is a vertical cross-sectional view of a primary molded product, and FIG. 3 is a vertical cross-sectional view showing a state in which a coating or film layer is formed on a predetermined portion of the primary molded product. FIG. 4 is a longitudinal sectional view of the product after secondary molding. Figures 5 and 6 show an embodiment of the present invention of configuration 3 (claim ■), in which Figure 5 is a vertical cross-sectional view of the primary molded product, and Figure 6 is a vertical cross-sectional view of the product after secondary molding. It is a diagram. (1) (1') (1')...Protrusion (2) (2') (2')...Core body (3) (3'
)(3')...Covering body (4)(4')(4')
...Thin layer (A) (A') (A')...Plastic molded product for display (and above) 2nd [11 Fig. 1 1 Fig. 4 8 Fig. 5] 1 Fig. 6 A ″

Claims (3)

[Claims] (1) A core body made of a transparent or translucent plastic molded product having a protrusion on the front surface corresponding to the display, bonded and molded onto the core body except for the back surface of the core body and the front surface of the above-mentioned protrusion. 1. A plastic molded product for a display, comprising a covering body made of a colored plastic molded product, and a colored translucent thin layer formed on at least the front end surface of the protrusion and the front surface of the peripheral surface portion of the core body. (2) A core body made of a transparent or translucent plastic molded product having a protrusion on the front surface corresponding to the display, bonded and molded onto the core body except for the back surface of the core body and the front surface of the above-mentioned protrusion. A method for producing a display plastic molded product comprising a covering body made of a colored plastic molded product, and a colored translucent thin layer covering at least the front end surface of the protrusion and the front surface of the peripheral surface portion of the core body, the core body The body and the covering body are molded by a two-color molding method, and during the molding, a colored translucent thin layer is applied to at least the front end surface of the protrusion and the front surface of the peripheral surface of the core body on the core mold after primary molding. A method for producing a display plastic molded product, which comprises performing secondary molding after forming. (3) A core body made of a transparent or semi-transparent plastic molded product having a protrusion on the front surface corresponding to the display, bonded and molded onto the core body except for the back surface of the core body and the front surface of the above-mentioned protrusion. A method for producing a display plastic molded product comprising a covering body made of a colored plastic molded product, and a colored translucent thin layer covering at least the front end surface of the protrusion and the front surface of the peripheral surface portion of the core body, the core body The body and the covering body are molded by a two-color molding method, and during the molding, a colored translucent thin layered insert is placed in the cavity on the primary molding side at a portion corresponding to the front end surface and peripheral surface of at least the protrusion of the core body. 1. A method for producing a display plastic molded product, which comprises performing primary molding and then secondary molding.