JPH0957791A - Synthetic resin product and transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform metallic finish of accessories or the like for an automobile having various shapes at a low cost by transferring a metallic film on the surface of the body made of a synthetic resin without being attended with a crack and a wrinkle even if the object face of the metallic finish of the body is a curved surface. SOLUTION: Minute numberless metallic dot films (b) are allowed to closely adhere to an elastic sheet made of a synthetic resin without,being mutually touched. At time of injection molding of the body 3 with a molten resin, the face stuck with the metallic dot films of the sheet is mutually faced to the part corresponding to the inside face of the body 3. The metallic dot films (b) stuck to the sheet are transferred on the inside face of the body 3. Thereby, metallic finish is performed on the inside face of the body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin product in which the surface of a transparent body injection-molded with a molten resin, such as a metallic-finished synthetic resin automobile accessory, has a metallic finish. The present invention relates to a transfer sheet used for the metallic finish.

[0002]

2. Description of the Related Art As an example of an automobile accessory, which is an example of the above-mentioned synthetic resin product, a side visor provided on a window frame of an entrance / exit door or a drip molding on a roof side,
There is a license plate base that decoratively borders the license plate, a door edge protector to prevent the door edge from hitting and damaging other objects when the door is opened, and other names and model marks representing the model of the car. These automobile accessories are often metallically finished in consideration of design and fashion.

For example, in a side visor provided along the window frame of an entrance / exit door, the side visor is injection-molded with a transparent synthetic resin material such as polycarbonate or acrylic, and is placed along the inclined window frame therein. If the visor portion is metallic, the maneuverability of the driver is impaired, so the surface of the visor portion along the upper edge of the window frame is metallic except for the inclined visor portion.

Even the license plate base is injection-molded with a transparent synthetic resin material to decorate the edge of the license plate attached to the base.
The inner surface of the base circumference is metallic, and the door edge protector, name indicating the vehicle type, model mark, etc. are injection-molded with a transparent synthetic resin material, and the surface is metallic.

[0005]

The means for metallically finishing the surface of the synthetic resin accessory body is as follows.
Metal plating is most common, but metal plating is performed as a separate process after injection molding of a synthetic resin accessory body, and thus there is a problem that the manufacturing cost is very high.

Therefore, the applicant of the present invention attaches a metal film of aluminum or the like to a stretchable synthetic resin sheet by means of vapor deposition or the like, and at the time of injection molding of the accessory body with a transparent molten resin, the surface of the metal film to be attached. This sheet is positioned between the injection molding dies of the accessory body so that the sheet is relatively exposed to the inner surface of the accessory body, and the metal film adhered to the sheet is attached to the inside of the accessory body by the welding action of the molten resin. We tried to develop a technology to transfer to the side.

Even with respect to accessory bodies with complicated cross-sectional shapes, if such technology is established, a metallic finish will be applied to the accessory body by injection molding itself of the accessory body. A metallic finish will be achieved at a cheap price.

However, in reality, it is an exaggeration to say that the thermal expansion and contraction rates of the synthetic resin sheet and the metal film are remarkably different, and that the metal film has almost no heat shrinkability as compared with the synthetic resin sheet. However, when the target surface of the metallic finish of the accessory body is a convex curved surface part, the metal film is torn without catching the thermal expansion of the synthetic resin sheet, and conversely, in the case of a concave curved surface part. However, the shrinkage of the synthetic resin sheet causes the metal film to become wrinkled, and the above-mentioned metal film transfer technology is limited in that the target surface of the metallic finish of the accessory body is a flat surface. There was.

The present invention has improved this point. Even if the target surface of the metallic finish of the synthetic resin main body is a curved surface, the metal film is applied to the surface of the main body without causing cracks or wrinkles. The purpose of the present invention is to enable the metallic finish of various shapes of automobile accessories and the like at low cost.

[0010]

The technical means taken by the present invention to achieve the above object are as follows. That is, the synthetic resin product according to the first invention is a synthetic resin product in which the surface of a transparent body that is injection-molded with a molten resin is metallically finished, and a stretchable synthetic resin sheet has a myriad of minute metal particles. While the dot films are not attached to each other but adhered closely to each other, during injection molding of the main body with transparent molten resin, the metal dot film adhered surface of the sheet is relatively faced to a portion corresponding to the inner surface (inner surface) of the main body. Then, the metal dot film attached to the sheet is transferred to the inner surface of the main body.

The transfer sheet according to the second aspect of the present invention is a transfer sheet for metallically finishing the surface of a transparent body injection-molded with molten resin. Dot films are adhered closely without touching each other, and the adhesive force between the metal dot film and the sheet is set to be weaker than the adhesive force between the metal dot film and the transparent body injection-molded by the molten resin. is there.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a synthetic resin side visor 1 which is an example of an automobile accessory. The synthetic resin side visor 1 is a long so-called roof visor that is installed in the drip molding 2 on the roof side of the automobile body, and is a transparent visor body that is injection-molded with a molten resin such as polycarbonate or acrylic. A visor attachment metal fitting 4 is provided on the inner side surface of the (accessory body) 3 at a predetermined interval, and a double-sided adhesive tape 6 with release paper a is provided on the inner side surface of the ear portion 5 of the visor body 3. And the inclined visor part 1
The linear visor portion 1B except A is metallically finished as follows.

That is, as shown in FIG. 3A, a myriad of minute metal dot films b are densely attached to one side surface of the stretchable synthetic resin sheet 7 by means such as vapor deposition without contacting each other. To form the transfer sheet A. More specifically,
To correspond to the linear visor portion 1B, an infinite number of metal dot films b are attached to the synthetic resin sheet 7 with a minute fixed interval. The adhesive force between the metal dot film b and the sheet 7 is such that the metal dot film b is peeled from the sheet 7 and transferred to the inner surface (inner surface) of the visor body 3 during injection molding of the visor body 3. It is set to be weaker than the adhesive force between the dot film b and the visor body 3. The shape of each metal dot film b is circular, but may be any of an ellipse, a triangle, a quadrangle, and a polygon, and these may be arbitrarily combined.

The above-mentioned transfer sheet A is used by being sandwiched in a mold during injection molding of the visor body 3 with a molten resin, and at the same time as molding of the visor body 3, metallic finish by transfer is performed. Specifically, the sheet 7 is set between the male and female visor forming dies 8 and 9 with the metal dot film adhering surface of the sheet 7 facing the female die 8 side for forming the outer surface of the visor body 3. Further, as shown in FIG. 3B, the other side surface of the sheet 7 is attracted to the inner surface of the male mold 9 by vacuum to combine the male and female molds 8 and 9.

Next, as shown in FIG. 3C, the molten resin is injected and injected into the visor molding space P between the two molds 8 and 9, and the transparent visor body 3 is injection molded.
Due to the welding action of the molten resin at this time, a myriad of minute metal dot films b, which are a set of dots (points) but are planar in appearance (for human vision), are formed on the linear visor portion 1
It is transferred to the inner surface (inner surface) of B.

Then, as shown in FIG. 3D, the molds 8 and 9 are separated, the visor body 3 with the sheet 7 attached to the inner surface is taken out, and the sheet 7 is peeled off. The inclined visor portion 1A is transparent, but with respect to the linear visor portion 1B, the metal dot film b is transferred to the inner surface of the linear visor portion 1B to form the linear visor portion 1B.
That is, the visor body 3 having a metallic finished surface is formed.

Since the metal film which is attached to the synthetic resin sheet 7 and has a planar appearance is a collection of metal dot films b, the metal film is transferred during injection molding of the visor body 3. When the target is the convex curved surface portion 3a, the synthetic resin sheet 7 thermally expands so that the metal dot films b are separated from each other, and when the target is the concave curved surface portion 3b, the synthetic resin film 7 is moved so that the metal dot films b are close to each other. The manufactured sheet 7 contracts.

In the above embodiment, since the metal dot film b is deposited on the synthetic resin sheet 7 at minute fixed intervals, the convex curved surface portion is larger than the flat metallic finish surface 3c. In 3a, the metal dot film b is transferred in a slightly sparse manner, and in the concave curved surface part 3b, the metal dot film b is transferred in a sparser manner, so that the metallic finish surface has a slight difference in shade. There is no visible tearing or wrinkling of the metal film that is visible and transferred to the surface.

Although the lightness and darkness of the metallic finish surface may lead to an improvement in the design of the side visor 1, on the contrary, without attaching the metal dot films b at regular intervals, According to the uneven curved surface, the metal dot film b may be more densely attached to the sheet surface corresponding to the convex curved surface portion 3a, and the metal dot film b may be roughly attached to the sheet surface corresponding to the concave curved surface portion 3b. For example, it is possible to avoid the sparse and dense transfer of the metal dot film b to the inner surface of the visor body 3, and the density of the metallic finished surface becomes invisible. In addition, since the metal dot film b is transferred to the inner surface (inner surface) of the transparent visor body, the metallic finish surface is in sliding contact with another object (for example,
Not easily scratched by sliding contact with a car wash brush.

The visor mounting metal member 4 is composed of a first metal member 10 which engages the drip molding 2 from above, and a second metal member 11 which engages the drip molding 2 from below and is screwed to the first metal member 10. And the first metal fitting 10
A through hole d is formed in the face plate facing the inner side surface of the visor, while a rivet body e is projected on the inner side surface of the visor, and the rivet body e is inserted into the through hole d to be caulked. The one metal fitting 10 is integrated with the visor body 3.

In the above embodiment, the roof visor is exemplified as the synthetic resin product, but the side visor provided in the window frame of the entry / exit door, the sun visor provided in the vehicle, the license plate base, the door edge protector, Various automotive accessories such as names representing vehicle types and model marks, and other synthetic resin products can be applied to the present invention.

[0022]

According to the present invention, since a myriad of minute metal dot films, which are a set of dots (points) but have a planar appearance, are transferred onto the surface of a transparent body made of synthetic resin, Not only when the target surface of the metallic body of the resin main body is a flat surface but also when it is a convex curved surface or a concave curved surface, the metal film that is transferred to the surface part and becomes planar in appearance is It does not tear or wrinkle due to the difference in expansion and contraction rates.
Therefore, metallic finishes for automobile accessories of various shapes can be made to look good, and the metallic finish can be performed at a lower cost than metal plating. Also, because the metal dot film is transferred to the inner surface (inner surface) of the transparent body, there is an advantage that the metallic finish surface is not easily scratched by sliding contact with another object (for example, sliding contact with a car wash brush). is there.

[Brief description of drawings]

FIG. 1 is a perspective view of a roof visor with a part taken out and enlarged.

FIG. 2 is a sectional view of a roof visor attached to a drip molding.

3A to 3D are explanatory views showing a molding example of a roof visor made of a molten resin.

[Explanation of symbols]

A ... Transfer sheet, 3 ... Visor body (main body made of synthetic resin), 7 ... Sheet made of synthetic resin, b ... Metal dot film.

Claims (3)

[Claims] 1. A synthetic resin product in which the surface of a transparent body injection-molded with a molten resin is metallically finished, and an infinite number of minute metal dot films are contacted with each other on a stretchable synthetic resin sheet. On the other hand, when the body is injection-molded with a transparent molten resin, the metal dot film adhesion surface of the sheet is relatively faced to a portion corresponding to the inner surface of the body, and the metal dot film adhered to the sheet A synthetic resin product characterized by being transferred to the inner surface of the main body. 2. The synthetic resin product according to claim 1, wherein the synthetic resin product is an automobile accessory. 3. A transfer sheet for metallically finishing the surface of a transparent body injection-molded with a molten resin, wherein a stretchable synthetic resin sheet is in contact with a myriad of minute metal dot films. Do not let it adhere closely,
A transfer sheet, wherein the adhesive force between the metal dot film and the sheet is set to be weaker than the adhesive force between the metal dot film and a transparent main body injection-molded with molten resin.