JP4224242B2 - Manufacturing method of in-mold transfer plate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an in-mold transfer plate having a large film squeezed by in-mold molding and having a seat at the level difference of the squeezed part.
[0002]
[Prior art]
Conventionally, in-mold molding has a depth, and when forming a seat in a cavity with a step to form a seat, the film is greatly squeezed while receiving heat, so this film surface is displaced and wavy Was.
[0003]
In order to prevent the film from slipping and wavy, after molding each molded product in-mold, the peripheral portion where the molded product slips and wavy has occurred is removed by cutting, and a seat is formed by providing a step. Is also possible.
[0004]
[Problems to be solved by the invention]
However, in the above method, it takes time to cut each molded product, and when the molded product is small like a protection panel of a liquid crystal display, it is difficult to fix it during the cutting work.
[0005]
Accordingly, the present invention provides an in-mold transfer plate that can integrate a part of a cavity for molding the shape of a final product with a runner forming unit and cut and remove the periphery of the molded product to form a step. It aims to provide a method.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a typical method for producing an in-mold transfer plate according to the present invention includes a plurality of cavities formed by a fixed mold and a movable mold for molding a shape of a molded product, Using a mold having a runner forming part for forming a runner partially overlapping a molded product, passing a continuous film over the cavity part and the runner forming part, and the fixed mold and the movable mold And then molding the molded product and the runner in which the print pattern of the continuous film is transferred to the transparent acrylic resin by injecting a transparent acrylic resin between the continuous films from a predetermined injection port. When, after cutting to form a groove on the periphery of the molded article in a state of fixing the said runner, a stage of producing the final molded article by cutting a peripheral edge of the molded article from the runner Is a manufacturing method for in-mold transfer plate having a step on the periphery, characterized in that it comprises a stage of producing the final molded article by cutting a peripheral edge of the molded article, from the runner.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a method for producing an in-mold transfer plate according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an in-mold transfer plate formed by the manufacturing method of the 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 an explanatory diagram of a method for manufacturing a protective panel, FIG. 5 is an explanatory diagram of a method for manufacturing the protective panel, and FIG. 6 is an explanatory diagram of a method for manufacturing the protective panel.
[0008]
FIG. 1 shows an example of an in-mold transfer plate manufactured according to this embodiment. This in-mold transfer plate P is used as a panel of an electronic device display window such as a mobile phone. The in-mold transfer plate P shown in FIG. 1 is a transparent acrylic plate, has a step around the periphery, forms a seat 1b that fits into a housing such as a mobile phone, and displays a liquid crystal screen at the center. Therefore, a transparent display window 1a is left.
[0009]
Hereinafter, a method for manufacturing the in-mold transfer plate P according to the present embodiment will be described.
[0010]
As shown in FIG. 2A, in the first step, continuous films 6 and 13 are passed between the fixed mold 3 and the movable mold 4 from one to the other.
[0011]
As shown in FIG. 2B, the fixed mold 3 and the movable mold 4 include a plurality of cavity portions 3b and 4b for forming the shape of the molded product 20, and a runner partially overlapping with the cavity portions. Forming portions 3a and 4a are formed. An injection port 3c for injecting a transparent acrylic resin is formed in the center of the runner forming portion 3a of the fixed mold 3. In the plurality of cavity portions 3b and 4b, a plurality of a pair of cavity portions 3b and 4b opposed to each other centering on the center of the runner forming portions 3a and 4a are arranged at predetermined intervals in the transport direction of the continuous films 6 and 13 described later. The runner forming portions 3a and 4a are introduction paths for guiding the transparent acrylic resin injected from the injection port 3c to the cavity portions 3b and 4b. When the resin is filled and solidified, the runner 20b is formed.
[0012]
A winding device 5 is attached to the fixed mold 3. Each winding device 5 has a delivery roll 5a and a winding roll winding roll 5b, and a continuous film 6 is wound between them.
[0013]
The continuous film 6 is wound and held around the delivery roll 5a, and the preparation is completed by passing the tip between the fixed mold 3 and the movable mold 4 and winding it around the winding roll 5b. As with the fixed mold 3, the movable mold 4 is also provided with a take-up roll 25a having a continuous roll 13 and a take-up roll 25b.
[0014]
Here, as shown in FIG. 3 (a), the continuous films 6 and 13 improve the hardness of the release layers 8 and 15 made of a non-adhesive material on the PET base films 7 and 14 in this order. The UV hard layers 9 and 16 which are hard coat layers for printing, the anchor layers 10 and 17 for improving the fixing property of printing, the printing layers 11 and 18 and the adhesive layers 12 and 19 are laminated.
[0015]
As shown in FIG. 3B, the print layer 11 is formed so that a print pattern aligned with the cavity portions 3b and 4b partially overlaps the runner formation portions 3a and 4a. A plurality of a pair of printing patterns opposed to each other centering on the center of 4a are formed at predetermined intervals in the transport direction of the continuous films 6 and 13. The print pattern has a portion that is not printed to form a transparent display window 1a (see FIG. 1).
[0016]
As shown in FIG. 4A, the winding devices 5 and 25 are operated, and the continuous films 6 and 13 are intermittently interposed between the fixed mold 3 and the movable mold 4 with the adhesive layers 12 and 19 facing each other. To send. This intermittent feeding operation is controlled so that the above-described printing pattern always coincides with the cavity portions 3b and 4b of the fixed mold 3 and the movable mold 4 and a hole 6a described later with the injection port 3c.
[0017]
Next, as shown in FIG. 4B, the continuous films 6 and 13 are intermittently fed as described above, stopped at a predetermined position, and then the fixed mold 3 and the movable mold 4 are clamped together. .
[0018]
Thereafter, as shown in FIG. 4C, holes 6a are formed in the continuous film 6 at a predetermined interval, and transparent acrylic resin is injected between the continuous films 6 and 13 from the injection port 3c through the holes 6a. . The injected transparent acrylic resin is filled into the cavities 3b and 4b while pressing the continuous films 6 and 13 toward the fixed mold 3 and the movable mold 4 side.
[0019]
Then, after the transparent acrylic resin is cured, as shown in FIG. 5, the release layers 8 and 15 and the base films 7 and 14 of the continuous films 6 and 13 are peeled off from the molded product 20 in which the continuous films 6 and 13 are integrated. Complete the transfer process.
[0020]
Next, as shown in FIG. 6, the runner 20b formed in the runner forming portion is supported and fixed using a predetermined jig (not shown). In this state, the end mill 21 is used as a cutting jig to cut the surface of the peripheral portion 20c of the molded product 20 to a predetermined depth to form a step (seat portion 1b). Finally, the connecting portion between the runner 20b and the molded product 20 is cut so as to be continuous with the contour of the periphery of the molded product 20, and the final molded product is separated from the runner 20b.
[0021]
The protective panel P can be continuously manufactured by sequentially sending out the print patterns of the continuous films 6 and 13 and repeating the above-described steps.
[0022]
As described above, a part of the cavity portions 3b and 4b for forming the shape of the final product is integrated with the runner forming portions 3a and 4a, and the periphery of the molded product 20 is cut to form a step (seat portion 1b). By removing the film, it is possible to avoid the drawing of the film, and to perform in-mold forming of a product having a large film drawing and a stepped portion at the drawn part.
[0023]
Further, by engaging the seat portion 1b with a casing such as a mobile phone, distortion and sink marks generated in the peripheral portion 20c of the molded product 20 can be hidden, and polarization distortion is prevented from occurring in the display window 1a. be able to.
[0024]
Further, by providing a plurality of the cavity portions 3b and 4b, it becomes easy to perform secondary processing such as cutting of the periphery of the molded product 20 at the same time, and the production efficiency can be improved.
[0025]
【The invention's effect】
As described above, a part of the cavity part for forming the shape of the final product is integrated with the runner forming part, and cut to form a groove part on the periphery of the molded product, so that the film is formed by in-mold molding. A product having a large aperture and a step in the aperture can be molded in-mold.
[Brief description of the drawings]
FIG. 1 is a perspective view of an in-mold transfer plate formed by a manufacturing method according to an 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 configuration diagram of a continuous film.
FIG. 4 is an explanatory diagram of a manufacturing method of a protection panel.
FIG. 5 is an explanatory diagram of a manufacturing method of a protection panel.
FIG. 6 is an explanatory diagram of a method for manufacturing a protection panel.
[Explanation of symbols]
P ... In-mold transfer plate 1a ... Display window 1b ... Seat part 3 ... Fixed mold 3a ... Runner forming part 3b ... Cavity part 3c ... Injection port 4 ... Movable mold 4a ... Runner forming part 4b ... Cavity parts 5, 25 ... Winding device 5a, 25a ... Sending roll 5b, 25b ... Winding roll 6, 13 ... Continuous film 6a ... Hole 7, 14 ... Base film 8, 15 ... Release layer 9, 16 ... Hard layer
10, 17… anchor layer
11, 18 ... Print layer
12, 19 ... Adhesive layer
20… Molded product
20b Runner
20c ... peripheral part
21… End mill

Claims (1)

A mold having a plurality of cavities for forming a shape of a molded product and a runner forming unit for forming a runner partially overlapping the molded product is formed using a fixed mold and a movable mold. ,
Passing a continuous film over the cavity portion and the runner forming portion;
The molding in which the printing pattern of the continuous film is transferred to the transparent acrylic resin by injecting the transparent acrylic resin between the continuous films from a predetermined injection port after combining the fixed mold and the movable mold Forming a product and the runner;
After cutting so as to form a groove on the periphery of the molded product in a state where the runner is fixed, cutting the periphery of the molded product from the runner to produce a final molded product,
Cutting the periphery of the molded product from the runner to produce the final molded product;
The manufacturing method of the in-mold transfer board which has a level | step difference in the periphery characterized by having .

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