JPH0657172B2 - Synthetic resin watch band - Google Patents

Description

The present invention relates to a synthetic resin wristwatch band having a three-layer integrated structure with a transfer foil as an intermediate layer.

[Conventional technology and its problems]

Almost all wristbands made of synthetic resin are made of soft synthetic resin (such as thermoplastic polyurethane), and are produced by injection molding. Since this band is cheaper than those made of metal, leather, etc., it is used very much.

However, the band integrally molded with the synthetic resin as described above, particularly the synthetic resin band colored in a bright color, gradually turns yellow (becomes a yellowish state) as time passes and becomes dirty. There is a drawback that makes you feel like this. For this reason, conventional synthetic resin bands are mainly made of black resin material that does not worry about yellowing (yellowing is not noticeable), but such black bands alone are diversified. There is a demand for the development of a low cost synthetic resin band which cannot meet the needs of the wearer, has an aesthetic appearance comparable to that of a metal band or a leather band, and does not cause a yellowing problem.

[Object of the Invention]

This invention has been made based on the above background,
Its purpose is a three-layer integrated structure (a surface layer, an intermediate layer, and a back layer that are completely integrated) that can give an aesthetic appearance comparable to that of a metal band or leather band and that does not cause a yellowing problem. It is to provide a synthetic resin band having a layer structure).

[Outline of Invention]

In order to achieve the above object, the present invention has a three-layer structure in which a synthetic resin band is integrated with a surface layer, an intermediate layer and a back surface layer, a decorative transfer foil is used for the intermediate layer, and a surface layer By using a transparent synthetic resin that does not yellow or hardly yellow, it is possible to give an aesthetic appearance comparable to that of a metal band or a leather band. And a transfer foil for decoration in which cuts are formed at regular intervals in the length direction of the band, and the front surface layer and the back surface layer of the band are directly resin-bonded by the outer peripheral portion of the transfer foil and the contact / separation portion. In this way, the three-layer integration of the front and back layers including the transfer foil is completed.

Example of Invention

An embodiment of the present invention will now be described with reference to the drawings. This wristwatch band made of synthetic resin has a backside layer 3 mainly made of opaque soft synthetic resin such as thermoplastic polyurethane or vinyl chloride, and a non-yellowing layer. Alternatively, a sandwich is provided between the surface layer 2 and a surface layer 2 formed of a transparent hard synthetic resin (a synthetic resin such as thermoplastic polyurethane or vinyl chloride mixed with an ultraviolet absorber) that does not easily turn yellow. The band has a three-layer integrated structure including a transfer foil 1 which is an intermediate layer of the band, and the band has a plurality of band metal fittings penetrating the surface layer 2, the intermediate layer (transfer foil 1) and the back surface layer 3. It has a locking hole 5 and a band metal fitting mounting hole 6 located at one end of the band back surface layer 3, and the surface layer 2 has a surface perpendicular to the band length direction in order to give a hard material flexibility. Lateral groove
A plurality of 2a are provided as shown in FIG.
Also, a back surface lateral groove 3a similar to the lateral groove 2a is provided in a smaller number than the surface layer lateral groove 2a as shown in FIG.

In the case of the present invention, the intermediate layer has an outer shape slightly smaller than the outer shapes of the front and back layers 2 and 3 of the band, and the contacting / separating portion 1a is formed in the band length direction at the same interval as the front surface lateral groove 2a. Figure,
Using the transfer foil 1 formed as shown in FIG. 3, the front surface layer 2 and the back surface layer 3 of the band are the outer peripheral portion 1b and the contact / separation portion 1a of the transfer foil 1.
As shown in FIG. 4, by directly resin-bonding, the three layers of the front and back layers 2 and 3 including the transfer foil 1 are completely integrated, and the band metal fitting locking hole 5 has the surface lateral groove 2a.
And a rectangular hole or a circular hole as shown in FIG. 1 which penetrates the position of the transfer foil contacting / separating portion 1a.

The synthetic resin wristwatch band having the above structure is produced by the following molding method.

[First step] A transparent, yellow-free or hard-to-yellow hard synthetic resin is used as the band surface layer 2 as a thin primary molded product (this synthetic resin can withstand pressure bonding at the time of transfer of the transfer foil 1 described later). Injection molding is performed as shown in FIG. 2 by using a thermoplastic polyurethane, vinyl chloride, or the like having a hardness and containing an ultraviolet absorber. In addition, in the band surface layer 2 which is the primary molded product, the above-described band metal fitting locking hole 5 and the surface lateral groove 2a are formed in the molding die
Simultaneous molding is performed by injection molding using 8.

"Second step" The die moving operation is temporarily stopped in the process in which the primary molding in the first step is completed and the mold 7 holding the primary molded product (band surface layer 2) moves to the secondary molding position. The transfer foil 1 is transferred to the band surface layer 2 at a position as shown in FIG.
This transfer method is performed, for example, by using the vapor deposition foil 11 shown in FIG. 5 having a polyester sheet a, a release layer b, a coloring layer c, a metal layer d, and an adhesive layer e. e is polymerized on the surface layer 2 so as to face the surface layer 2, thermocompression-bonded from above with a heating head, a heating roller, etc., and the polyester sheet a is peeled off by the release layer b, Transfer of the transfer foil 1 including the colored layer c, the metal layer d, and the adhesive layer e to the band surface layer 2 is performed. In this case, the outer margin portion 1b, which is slightly smaller than the outer shape of the band surface layer 2 of the transfer foil 1, the contact / separation portion 1a, and the portion where the band metal fitting locking hole 5 is formed are not heat-pressed but peeled together with the polyester sheet a. (Partial peeling of the transfer foil 1 as described above is possible by making the pressure-bonding portion and the non-pressure-bonding portion of the heating head uneven, or by heat-pressing using a perforated masking plate). At this time, if the band locking hole 5 having a circular shape or a rectangular shape is provided at the central position of the transfer foil contacting / separating piece as shown by an imaginary line in FIG. Has a problem that the bonding force to the band surface layer 2 is weakened and the polyester sheet a is peeled off together with the polyester sheet a when peeled off. Part 1a
Since the contact and separation parts are formed so as to be slightly notched on both sides of the contact and separation part, the above-mentioned peeling problem of the transfer contact and separation piece does not occur.

When the above-mentioned vapor deposition foil 11 is used as the transfer foil 1, the vapor deposition layer can give a feeling like a metal band, and the transfer foil 1 can be a printing foil (for example, a polyester sheet). , A release foil, a printing layer, a metal layer, and an adhesive layer), it is possible to give a feeling like a leather band.

[Third step] After the transfer of the second step, the mold 7 is moved to the secondary molding position, and the secondary molding (injection molding) using the molds 7 and 9 as shown in FIG. 4 is performed. As a result, the opaque soft synthetic resin band back surface layer 3 is integrated with the band front surface layer 2, and the transfer foil 1 is molded as an intermediate layer into the inside. In the case of this secondary molding, the band metal fitting locking hole 5, the band mounting hole 6, and the back surface lateral groove 3a are simultaneously molded in the band back surface layer 3 by the injection molds 7 and 9 as described above. Due to the presence of the transfer foil outline margin portion 1b and the contact / separation portion 1a, the front surface layer 2 and the back surface layer 3 are partially directly resin-bonded, and the front and back surface layers 2 and 3 including the transfer foil 1 are completely integrated into three layers. Can be achieved.

The wristwatch band of the present invention is molded by the molding method as described above, and the synthetic resin band obtained by this molding method is such that the surface layer 2, the intermediate transfer foil 1 and the back surface layer 3 are completely integrated. The transfer foil 1 is protected by the transparent synthetic resin surface layer 2.

〔The invention's effect〕

The synthetic resin watch band of the present invention has a three-layer structure in which the surface layer, the intermediate layer and the back surface layer are integrated as described above, and the intermediate layer has an outer shape slightly smaller than the front and back surface layers of the band and the band length. A transfer foil for decoration in which contact and separation portions are formed at regular intervals in a direction is used, and the surface layer is a transparent synthetic resin that does not yellow or hardly yellow, so that it is a band front and back layer and an intermediate layer. The transfer foil can be completely integrated, the transfer layer can be protected from abrasion, peeling, etc. by the surface layer, the conventional yellowing problem can be solved, and the metal band or leather band can be used. The transfer foil of a comparable appearance can be provided, and since the transfer foil of the intermediate sandwich is neither subjected to tension nor compression when the band is curved, the transfer foil, which is weak in tension, is not damaged.

[Brief description of drawings]

FIG. 1 (A) is a plan view showing a synthetic resin wristwatch band of the present invention partially cut away, FIG. 1 (B) is a central longitudinal sectional view of the wristwatch band, and FIGS. FIG. 5 is an explanatory view showing the method of molding the wristwatch band in the order of steps, and FIG. 5 is an enlarged sectional view showing a part of a vapor deposition foil used as a transfer foil. 1 ... Transfer foil as a band intermediate layer, 1a ... Transfer foil contact / separation part, 1b ... Transfer foil outer margin part, 2 ... Band surface layer,
3 ... The back layer of the band.

Continuation of the front page (56) References JP-A-50-115070 (JP, A) JP-A-59-196229 (JP, A) JP-A-57-107108 (JP, A) Actual development Sho-55-166630 (JP , U) Actual opening Sho 59-21209 (JP, U) Actual opening Sho 58-181214 (JP, U) Actual opening Sho 58-93211 (JP, U) Actual opening Sho 58-8319 (JP, U) Actual opening Sho 58-114110 (JP, U) Actual development Sho 53-121066 (JP, U) Japanese Patent Sho 50-19132 (JP, B1)

Claims (1)

[Claims] 1. A synthetic resin band having a three-layer structure in which a front surface layer, an intermediate layer, and a back surface layer are integrated, wherein the intermediate layer has an outer shape slightly smaller than the front and back surface layers of the band, and the band length direction. A watch band made of synthetic resin, characterized in that a transfer foil for decoration in which cuts are formed at regular intervals is used, and the surface layer is made of a transparent synthetic resin that does not yellow or hardly yellow.