JPH09239775A - Light permeable resin product and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin product covered with a light permeable resin and to produce the same by a novel method wherein an in-mold molding method and a two-color molding method are combined. SOLUTION: A resin product consists of the primary molded layer formed on one surface of a decorative layer using transfer foil and the secondary molded layer formed on the other surface thereof and is characterized by that either one of those molded layers is composed of a light permeable resin. An injection molding machine consisting of primary and secondary molds 5, 6 provided on either one of a movable plate and a fixed plate, the common mold 4 provided on the other one of them corresponding to the primary or secondary molds 5, 6 and the turntable 3 having either one of the primary and secondary molds 5, 6 and the common mold 4 placed thereon provided on either one of the movable plate and the fixed plate is used in the production of the resin product and, at a time of an injection molding process, a decoration process forming a decorative layer on a primary or secondary resin by using transfer foil and a replacing process revolving the turntable 3 by a predetermined angle in a mold opening state and replacing the combination of the primary or secondary molds 5, 6 and the common mold 4 corresponding thereto are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an in-mold molded resin product which is painted at the same time as molding, and in particular, a two-color molded resin product in which the upper surface of the painted portion is covered with a transparent resin. Regarding In addition, in this specification, the transparent resin includes a transparent resin.

[0002]

2. Description of the Related Art An in-mold molding method has been conventionally known in which a transfer foil is used to perform simultaneous painting during resin molding.
Also known is a two-color molding method in which different resins are overlapped and injection-molded by exchanging one of a primary mold and a secondary mold forming a pair of molding molds with a common mold for the other. . Further, there are known resin products in which a mark such as a character and a figure appears in a transparent resin.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a resin product covered with a translucent resin and a novel manufacturing method thereof by combining an in-mold molding method and a two-color molding method. .

[0004]

According to the present invention, a primary molding layer formed on one side of a decorative layer using a transfer foil, a secondary molding layer formed on the other side, and at least the molding layers thereof are provided. The present invention relates to a resin product, characterized in that one of them is made of a translucent resin, and a manufacturing method thereof, wherein the manufacturing method includes a primary and a secondary provided on either the movable plate side or the fixed plate side. The movable plate includes a die, a common die provided on the other side corresponding to the primary or secondary die, and a rotary table on which one of the primary and secondary die or the common die is mounted. Side or fixed plate side, using an injection molding machine provided on either one, at least one of the primary or secondary mold and the common mold corresponding to these mold closed alternating molds An injection molding step of injecting a primary or secondary resin, which is a translucent resin, and at the time of the injection molding step A decoration forming a decorative layer using a transfer foil to the primary or secondary resin in the die opening state,
The rotating step is rotated by a predetermined angle to replace the combination of the primary or secondary mold and the corresponding common mold, and one of the alternate molds before or after the replacing process. And a take-out step of taking out a resin product formed by two-color molding with the primary and secondary resins.

[0005]

The primary molding layer is formed on one side of the decorative layer using the transfer foil, and the secondary molding layer is formed on the other side. At least one of the primary and secondary molding layers is made of a transparent resin, and the decorative layer can be seen through the transparent resin from the surface side.

[0006]

Embodiment 1 In the first embodiment shown in FIGS. 1 to 3, 3 is a rotary table provided on a movable plate of a vertical injection molding machine (not shown), and the rotary table is provided on a movable plate of the injection molding machine. It is rotatably attached to the rotation center axis. Reference numerals 4 and 4 denote two common molds having the same shape and arranged at 180-degree point symmetrical positions on the upper surface of the rotary table. Reference numerals 5 and 6 are a primary mold and a secondary mold, which are fixed to the lower surface of a fixing plate (not shown) of the molding machine so as to correspond to the common mold. In this embodiment, the common molds 4 and 4 compose a lower mold, the primary and secondary molds 5 and 6 compose an upper mold, and the common mold and a corresponding primary or secondary mold. In combination, two sets of molds are constructed. The combination of the two molds is replaced by rotating the rotary table 3 on which the common mold is placed by 180 degrees. A transfer foil 7 is interposed between the primary mold and a corresponding common mold, and is intermittently fed in a direction perpendicular to the plane of the drawing. Reference numeral 8 denotes a runner guided to the common mold from the lower side of the transfer foil, and a primary resin injection port is formed at the other end of the runner so as to open upward. Similarly, 9 is a runner guided to the secondary mold from the upper side of the transfer foil, and a secondary resin injection port is formed at the other end of the runner so as to open upward. Corresponding injection nozzles of an injection device are connected to these injection ports in a later-described injection molding process, and pressurized molten resin is fed into each of the injection ports. In this embodiment, the resin product is formed as follows. {Replacement Step} In this step, the turntable 3 is rotated 180 degrees and the left and right sides of the common mold are switched (see FIG. 1). As a result, the primary molded product molded using the primary mold 5 is located below the secondary mold 6. Further, after the transfer foil 7 is inserted between the upper mold and the lower mold in the mold open state, the transfer foil 7 is intermittently fed for a predetermined length, and a new transfer surface is positioned between the upper mold and the lower mold. {Mold Closing Step} Next, the movable platen of the injection molding machine (not shown) rises with respect to the fixed platen, and the mold block including the upper mold and the lower mold is closed. That is, each common mold 4 rises with respect to the corresponding primary or secondary mold 5, 6 and the transfer foil 7 interposed between them is placed in the corresponding mold. {Injection molding step} In this state, the molten transparent resin is injected from the lower side of the transfer foil to the primary mold and from the upper side of the decorative layer to the secondary mold (see FIG. 2). {Mold Opening Step} After that, the movable platen of the injection molding machine (not shown) descends with respect to the fixed platen, and the molds including the upper mold and the lower mold are opened. That is, the primary-molded (single-color molded) product and the secondary-molded (two-color molded) product injection-molded in the previous step descend together with the lower mold, while the transfer foil 7 is maintained in a horizontal state together with the upper mold. . As a result, the transfer foil 7 adhered to the upper surface of the primary molded product at the same time as the injection molding is separated from the primary molded product leaving the decorative layer, and the decorative layer is transferred to the molded product side (see FIG. 3). Then, the secondary molded product is taken out from the common mold. After this, the steps after the replacement step are repeated again.

007

Second Embodiment FIGS. 4 to 6 show another embodiment as a second embodiment. This embodiment is different from the first embodiment in the position where the transfer foil is provided. That is, 7 is a transfer foil interposed between the secondary mold and the corresponding common mold, and is intermittently fed in a direction perpendicular to the plane of the drawing. In addition,
The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Reference numeral 8 denotes a runner provided on the primary mold, and a primary resin injection port is opened upward at the other end of the runner. Similarly, 9 is a runner provided in the secondary mold, and a secondary resin injection port is opened upward at the other end of the runner. Corresponding injection nozzles of an injection device are connected to these injection ports in a later-described injection molding process, and different pressurized molten resins are respectively fed into the injection ports. In this embodiment, the resin product is formed as follows. {Replacement Step} In this step, the turntable 3 rotates 180 degrees and the left and right sides of the common mold are switched (see FIG. 4). As a result, the primary molded product molded using the primary mold is located below the secondary mold. Further, after the transfer foil 7 is inserted between the upper mold and the lower mold in the mold open state, the transfer foil 7 is intermittently fed for a predetermined length, and a new transfer surface is positioned between the upper mold and the lower mold. {Mold Closing Step} Next, the movable platen of the injection molding machine (not shown) rises with respect to the fixed platen, and the mold block including the upper mold and the lower mold is closed. That is, each common mold rises with respect to the corresponding primary or secondary mold, and the transfer foil interposed between them is arranged in the corresponding mold. {Injection molding step} In this state, the primary resin is injected into the primary mold and the secondary resin is injected into the secondary mold from above the transfer foil (see FIG. 5). {Mold Opening Step} After that, the movable platen of the injection molding machine (not shown) descends with respect to the fixed platen, and the molds including the upper mold and the lower mold are opened. That is, the primary and secondary molded products injection-molded in the previous step descend together with the lower mold. At that time, the transfer foil 7 also descends together with the lower mold (see FIG. 3). afterwards,
The secondary molded product is taken out from the corresponding common mold together with the transfer foil. After this, the steps after the replacement step are repeated again.

[0008]

As described above, the present invention provides a novel method for producing a resin product covered with a translucent resin, which has the advantages of the in-mold molding method and the two-color molding method. be able to. Further, the decorative layer of the resin product according to the present invention is protected by the translucent resin, and as a result, the decorative layer itself is less likely to be damaged. Furthermore, when a transparent resin is used as the primary and secondary resins, it has an aesthetic appeal that the decorative layer appears to be raised.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a state after a replacement step of a first embodiment.

FIG. 2 is a sectional view showing a state after the injection step as well.

FIG. 3 is a cross-sectional view showing a state after the mold opening step as well.

FIG. 4 is a cross-sectional view that schematically shows the state after the replacement step of the second embodiment.

FIG. 5 is a sectional view showing a state after the injection step as well.

FIG. 6 is a cross-sectional view showing a state after the mold opening step as well.

[Explanation of symbols]

 3 ... Rotating table 4 ... Common mold 5 ... Primary mold 6 ... Secondary mold 7 ... Transfer foil 8 ... Primary resin runner 9 ... Secondary resin runner

Claims (3)

[Claims] 1. A decoration layer formed by using a transfer foil, a primary molding layer formed on one side of the decoration layer, a secondary molding layer formed on the other side, and at least the molding layers thereof. A transparent resin product, characterized in that one of them is made of a transparent resin. 2. The translucent resin product according to claim 1, wherein both the primary and secondary molding layers are transparent resins. 3. A primary and secondary molds 5, 6 provided on either the movable plate side or the fixed plate side, and a common mold provided on the other side corresponding to the primary or secondary molds. 4, 4 and an injection molding machine equipped with a rotary table on which either one of the primary and secondary molds or the common mold is mounted on either the movable plate side or the fixed platen side. Alternatively, an injection molding step of injecting the primary or secondary resins A and B, at least one of which is a light-transmitting resin, into alternate molds which are closed and are composed of a secondary mold and a common mold corresponding thereto. And a transfer foil 7 applied to the primary or secondary resin during the injection molding process.
And a decorative step of forming a decorative layer using, and in the state where the mold is opened, the rotary table is rotated by a predetermined angle,
A replacement step of exchanging the combination of the primary or secondary mold and a common mold corresponding thereto, and before or after the replacement step, two-color molding is performed with one of the primary and secondary resins from one of the alternating molding molds. And a take-out step of taking out the resin product, the method for producing a translucent resin product.