JP4721572B2 - Double-sided in-mold molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a double-sided in-mold molded product having both sides subjected to transfer printing.
[0002]
[Prior art]
Conventionally, there are various methods for producing a transfer molded product that performs transfer printing at the same time as molding, and in particular, a method for producing a double-sided transfer molded product having a punching mechanism for a film is disclosed in Japanese Patent Application Laid-Open No. 62-227613. It is disclosed.
[0003]
In such a method for producing a double-sided transfer molded product, a hole is formed in a transfer film provided by positioning and supplying a film provided on the fixed mold side by a punching mechanism provided on the fixed mold side. Then, by injecting the resin through the holes, it is possible to easily obtain a transfer molded product in which transfer printing is performed on both sides of various shapes.
[0004]
[Problems to be solved by the invention]
However, the conventional method for producing a double-sided transfer molded product as described above requires that a hole be formed in the film, and cut dust generated during the punching operation remains in the cavity of the mold and enters the transparent molded product. There is a problem that the yield of the molded product is lowered because the cut dust sticks to the mold and a dent is formed on the surface of the molded product.
[0005]
Therefore, the present invention does not require a hole in the film, and manufacture of a double-sided in-mold molded product that can improve the yield of the molded product by preventing mixing of cut dust into the molded product and dent of the molded product. It aims to provide a method.
[0006]
[Means for Solving the Problems]
Representative production method of double-sided in-mold molded article according to the present invention in order to solve the above problems is made of the fixed mold and the movable mold having a cavity for molding a molded article, the surface pairs toward each other In the double-sided in-mold molding method in which the first continuous film and the second continuous film on which the printed layer is formed are passed in parallel, the fixed mold and the movable mold are formed on the mold side when the mold is clamped An S-shaped introduction path having a first curve and a second curve in order from the side is formed in a direction crossing the film feeding direction, and one end is opposed to the second curve on the fixed mold side. Passing the first continuous film and passing the second continuous film to the movable mold side so that one end faces the first curve, and combining the movable mold and the fixed mold In the S-shaped guide A step of injecting a resin between the first continuous film and the second continuous film from the entrance path to form the molded product, and the resin introduced into the S-shaped introduction path is: When passing through the first curve, the one end of the second continuous film is pressed toward the movable mold side, and when passing through the second curve, the one end of the first continuous film is A double-sided in-mold molding method characterized by pressing to the fixed mold side .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a double-sided in-mold molding method according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a protective panel formed by the manufacturing method of the present embodiment, FIG. 2 is an explanatory view of a stage in which a continuous film is continuously passed through a fixed mold and a movable mold, and FIG. FIG. 4 is a side sectional view of the continuous film, FIGS. 5 and 6 are perspective views of the continuous film, and FIGS. 7 and 8 are explanatory views of a method for manufacturing the protective panel.
[0008]
In FIG. 1, the example of the protection panels P1 and P2 manufactured by this embodiment is shown. The protective panels P1 and P2 are examples of panels for display windows of electronic devices such as mobile phones. A protective panel P1 shown in FIG. 1 (a) is a transparent acrylic plate 1a, and a frame 1b is printed around it, leaving a transparent display window 1c for displaying a liquid crystal screen at the center. Further, as shown in FIG. 1 (b), it is also possible to form a protective panel P2 having a transparent acrylic plate 2a as a whole and printed with one-points 2b of characters and patterns on a part thereof.
[0009]
Hereinafter, the manufacturing method of the protection panel P1 of the electronic device display window according to the present embodiment will be described. The present embodiment is an example of a mold apparatus that feeds two continuous films in parallel.
[0010]
As shown in FIG. 2, in the first step, the first continuous film 7 and the second continuous film 14 are continuously passed between the fixed mold 3 and the movable mold 4.
[0011]
As shown in FIG. 3A, the stationary mold 3 is formed with an injection port 3a for injecting a transparent resin, a first curve 3c connected to the injection port 3a, and a cavity 3b. The movable mold 4 is formed with an injection port 4a for injecting a transparent resin, a second curve 4c, and a cavity 4b connected to the inlet 4a. Then, as shown in FIG. 3B, when the movable mold 4 and the fixed mold 3 are clamped, an S-shape is formed by a first curve 3c and a second curve 4c in order from the inlet 3a side. The introduction path Z is formed in a direction (arrow B direction) orthogonal to the film feeding direction (arrow A direction: see FIG. 5). The injection ports 3a and 4a are provided at positions facing each other so as to form one injection port when the fixed mold 3 and the movable mold 4 are clamped together.
[0012]
As shown in FIG. 2, a first winding device 5 and a second winding device 6 are attached to each of the fixed mold 3 and the movable mold 4. Each of the winding devices 5 and 6 has feeding rolls 5a and 6a and winding rolls 5b and 6b, and the continuous films 7 and 14 are wound around them.
[0013]
The first continuous film 7 and the second continuous film 14 are respectively wound and held around the feed rolls 5a and 6a, and the leading ends are passed between the fixed mold 3 and the movable mold 4 to take up the take-up roll 5b, Preparation is completed by being wound around 6b. Further, as shown in FIG. 5, the first continuous film 7 is set to be narrower than the second continuous film 14.
[0014]
Here, as shown in FIG. 4 (a), the first continuous film 7 has a release layer 9 made of a non-adhesive material in order on a PET base film 8, and a UV for improving the surface hardness. A hard layer 10, an anchor layer 11 for improving fixing of printing, a printing layer 12, and an adhesive layer 13 are laminated. Also, as shown in FIG. 4B, the second continuous film 14 is similarly laminated on the base film 15 with the same release layer 16, UV hard layer 17, anchor layer 18, print layer 19, and adhesive layer 20. is doing.
[0015]
As shown in FIG. 5, the printed layers 12 and 19 are formed with a portion where printing is performed and a portion where printing is not performed, and a transparent resin layer is removed from the portion where printing is not performed on the back surface and the front surface. A display window (see FIG. 1) is formed. The print layers 12 and 19 are formed with a plurality of independent print patterns at predetermined intervals.
[0016]
As shown in FIG. 5, by providing a width difference between the first continuous film 7 and the second continuous film 14, the first continuous film 7 is arranged so that the first continuous film 7 faces the second curve 4 c on the fixed mold side. The continuous film 14 is disposed on the movable mold side so as to face the first curve 3c. Then, the winding devices 5 and 6 are operated so that the feeding direction (arrow A direction) of the first continuous film 7 and the second continuous film 14 run side by side with the respective adhesive layers 13 and 20 facing each other. Intermittent feeding is performed between the fixed mold 3 and the movable mold 4. This intermittent feeding operation is controlled so that the printing pattern always coincides with the cavity 3 b of the fixed mold 3 and the cavity 4 b of the movable mold 4.
[0017]
In order to arrange the second continuous film 14 so as to face the first curve 3c so that the first continuous film 7 faces the second curve 4c, the width of the continuous film is set as shown in FIG. Although the difference is provided, as shown in FIG. 6, the second continuous film 7 and the second continuous film 14 have the same width so that the first continuous film 7 faces the second curve 4c. Similarly, the film 14 is shifted in the width direction (arrow B direction) so as to face the first curve 3c, and similarly, the end 14a of the second continuous film 14 is arranged to face the first curve 3c. You can also.
[0018]
Next, the resin injection process will be described with reference to FIGS. As shown in FIG. 7 (a), the printing patterns of the first continuous film 7 and the second continuous film 14 are stopped at the positions of the cavities 3b and 4b as described above, and then, as shown in FIG. 7 (b). The fixed mold 3 and the movable mold 4 are combined and clamped.
[0019]
As shown in FIG. 8A, a transparent resin is injected into the injection port V after the movable mold and the fixed mold are combined. The injected transparent resin proceeds on the first curve 3c, and at this time, the force of the flowing resin is not applied to the end portion 14a of the second continuous film 14 facing the first curve 3c. That is, the transparent resin injected from the injection port V enters the first curve 3c, and its traveling direction X is directed toward the fixed mold 3, and the end of the second continuous film 14 on the movable mold 4 side. Get over 14a. For this reason, the injected transparent resin does not wrap around the second continuous film 14 and can reliably bias the second continuous film 14 to the cavity 4b.
[0020]
As shown in FIG. 8B, the transparent resin satisfying the first curve 3c proceeds on the second curve 4c, and at this time, the end portion 7a of the first continuous film 7 facing the second curve 4c. Does not take the force of the flowing resin. That is, the transparent resin satisfying the first curve 3c enters the second curve 4c, and its traveling direction Y is the direction toward the movable mold 4, and the end of the first continuous film 7 on the fixed mold 3 side. It flows under the part 7a. For this reason, the transparent resin satisfying the first curve 3c does not wrap around the inside of the first continuous film 7 and can surely bias the first continuous film 7 to the cavity 3b.
[0021]
As shown in FIG. 8 (c), the transparent resin satisfying the second curve 4c is formed in the cavity 3b, while pressing the first continuous film 7 and the second continuous film 14 toward the fixed mold and the movable mold. A molded product 21 filled with 4b and integrated with the first continuous film 7 and the second continuous film 14 is formed.
[0022]
Then, as shown in FIG. 8D, after the molded product 21 is cured, the fixed mold 3 and the movable mold 4 are opened, and the molded product 21 is sucked and taken out by a vacuum type take-out machine (not shown). . Thereby, both the 1st continuous film 7 and the 2nd continuous film 14 are made to isolate | separate the molded article 21 and each continuous film 7 and 14 between peeling layers 9 and 16 and UV hard layers 10 and 17. FIG.
[0023]
Thereafter, the sprue forming portion 21a, which is a molding portion remaining at the inlet, is cut off and the protective panel P1 is molded.
[0024]
As described above, the first continuous film 7 is passed through the fixed mold 3 side so as to face the second curve 4c, and the second side so as to face the first curve 3c on the movable mold 4 side. After passing the continuous film 14, the movable mold 4 and the fixed mold 3 are combined, and a transparent resin is injected between the first continuous film 7 and the second continuous film 14 from the S-shaped introduction path Z. By forming the molded product 21 in this way, it is possible to prevent the transparent resin from entering between the continuous film and the mold. Further, by adopting a molding method that does not perforate, cut dust generated during drilling work is prevented from being mixed into the molded product 21 and dents on the molded product 21 to improve the yield of the molded product 21. I can.
[0025]
The introduction path Z may be a path that intersects the film feeding direction (arrow A direction: see FIG. 5) and exits the continuous film, and is not necessarily orthogonal to the film feeding direction as in this embodiment. May be.
[0026]
【The invention's effect】
As described above, the first continuous film is passed through the fixed mold side so that one end is opposed to the second curve, and the first end is opposed to the first curve on the movable mold side. The two continuous films are passed, and after the movable mold and the fixed mold are combined, the material is injected between the first continuous film and the second continuous film from the S-shaped introduction path to form the molded product. To do. In this way, by adopting a molding method that does not perforate, mixing of cut dust into the molded product and dents on the molded product can be prevented, and the yield of the molded product can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a protective panel formed by the manufacturing method of the present embodiment.
FIG. 2 is an explanatory diagram of a stage in which a continuous film is continuously passed through a fixed mold and a movable mold.
FIG. 3 is a cross-sectional view of a fixed mold and a movable mold.
FIG. 4 is a side sectional view of a continuous film.
FIG. 5 is a perspective view of a continuous film.
FIG. 6 is a perspective view of a continuous film.
FIG. 7 is an explanatory diagram of a manufacturing method of a protection panel.
FIG. 8 is an explanatory diagram of a method for manufacturing a protection panel.
[Explanation of symbols]
P1, P2 ... Protective panel V ... Inlet port Z ... Inlet path 1a, 2a ... Plate body 1b ... Frame 1c ... Display window 2b ... One point 3 ... Fixed mold 3a, 4a ... Inlet port 3b, 4b ... Cavity 3c ... No. One curve 4 ... movable mold 4c ... second curves 5 and 6 ... winding devices 5a and 6a ... roll 7 ... first continuous films 8 and 15 ... base films 9 and 16 ... release layer
10, 17… UV hard layer
11, 18… Anchor layer
12, 19 ... Printing layer
13, 20 ... Adhesive layer
14… second continuous film
21… Molded product
21a ... Sprue forming part

Claims (1)

It consists stationary mold and the movable mold having a cavity for molding a molded article, two-sided-mold passing in parallel a first continuous film and the second continuous film to form a printing layer on the surface pairs toward each other In the method
When the fixed mold and the movable mold are clamped, an S-shaped introduction path having a first curve and a second curve in order from the inlet side formed on the side surface of the mold intersects the film feeding direction. Forming in the direction,
The first continuous film is passed through the fixed mold side so that one end faces the second curve, and the second continuous film is placed on the movable mold side so that one end faces the first curve. Passing through, and
Molding the molded product by injecting resin between the first continuous film and the second continuous film from the S-shaped introduction path after combining the movable mold and the fixed mold; Have
When the resin introduced into the S-shaped introduction path passes through the first curve, it presses the one end of the second continuous film toward the movable mold and passes through the second curve. When performing the double-sided in-mold molding method, the one end of the first continuous film is pressed to the fixed mold side .

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