JP2004025635A - Double-sided in-molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a double-sided in-mold molded product which does not require the formation of any hole in a film, can prevent the inclusion of cut wastes in the molded product and the occurrence of marking or denting in the molded product to improve the yield of the molded product. <P>SOLUTION: In this double-sided in-molding method, a fixed mold 3 and a movable mold 4 respectively with cavities 3b,4b for molding a molded product are provided. A first continuous film 7 having a print layer on its one side and a second continuous film 14 having a print layer on its one side are passed in parallel to each other through the cavities 3b and 4b so that the print layers in the first and second continuous films 7 and 14 face each other. When the fixed mold 3 and the movable mold 4 have been clamped, an S-shaped introduction path Z composed of a first curve 4c and a second curve 3c in this order from an injection port 3a side of a spool 3d opened so as to face to the movable mold 4 is formed on the side of the fixed mold 3, in its part outside the region through which the first continuous film 7 and the second continuous film 14 are passed, in a direction crossing the film feed direction. A resin is injected, from the S-shaped introduction path Z, a resin is injected in the gap between the first continuous film 7 and the second continuous film 14 to form the molded product. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a double-sided in-mold molded article having both sides subjected to transfer printing.
[0002]
[Prior art]
Conventionally, there are various methods for producing a transfer molded product which performs transfer printing simultaneously with molding. Particularly, a method for producing a double-sided transfer molded product having a mechanism for punching a film is disclosed in JP-A-62-227613. It has been disclosed.
[0003]
According to the method for manufacturing such a double-sided transfer molded product, a hole is formed in a transfer film fed and positioned at a film supply and positioning position provided on a fixed die side by a hole punching mechanism provided on a fixed die side. 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 surfaces 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 a hole to be formed in the film, and cut dust generated during the hole forming 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 reduced because cut dust adheres to the mold and dents are formed on the surface of the molded product.
[0005]
Accordingly, the present invention provides a method for producing a double-sided in-mold molded product that can improve the yield of a molded product by eliminating the need for making holes in the film, preventing cut dust from being mixed into the molded product, and preventing dents in the molded product. The aim is to provide a method.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a typical method for manufacturing a double-sided in-mold molded product according to the present invention comprises a fixed mold and a movable mold having a cavity for molding the molded product, and printing is performed on surfaces facing each other. In the double-sided in-mold molding method in which a first continuous film and a second continuous film each having a layer formed are passed in parallel, the fixed mold and the movable mold each have one of a first curve and a second curve. Then, when the mold is clamped, the first continuous film and the second continuous film on the fixed mold side outside the passing range, from the injection port side of the sprue opened to face the movable mold, the first in order. The first continuous film is formed such that an S-shaped introduction path having a curve and a second curve intersects the film feeding direction, and the fixed mold side has one end opposed to the curve of the movable mold. To And passing the second continuous film to the movable mold side such that one end faces the curve of the fixed mold, and combining the movable mold and the fixed mold to form the S-shape. A step of injecting a resin between the first continuous film and the second continuous film from an inlet passage to form the molded product.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
[First embodiment]
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 protection panel formed by the manufacturing method of the present embodiment, FIG. 2 is an explanatory view of a step of continuously passing a continuous film through a fixed mold and a movable mold, and FIG. FIG. 4 is a side sectional view of a continuous film, FIG. 5 is a perspective view of the continuous film, FIGS. 6 and 7 are explanatory views of a method of manufacturing a protective panel, and FIG. FIG. 9 is a view for explaining the arrangement, and FIG. 9 is an explanatory view of a fixed mold and a movable mold according to another embodiment.
[0008]
FIG. 1 shows an example of the protection panels P1 and P2 manufactured according to the present embodiment. The protection panels P1 and P2 are examples of panels for electronic device display windows such as mobile phones. The protection panel P1 shown in FIG. 1A is a transparent acrylic plate 1a, on which a frame 1b is printed around and a transparent display window 1c for displaying a liquid crystal screen is left in the center. Further, as shown in FIG. 1B, a protective panel P2 in which the whole is made of a transparent acrylic plate 2a and one point 2b of a character or pattern is printed on a part thereof can also be used.
[0009]
Hereinafter, a method for manufacturing the protection panel P1 of the electronic device display window according to the embodiment will be described. The present embodiment is an example of a mold apparatus of a type in which two continuous films are sent out 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 fixed mold 3 is formed with a sprue 3d for injecting a transparent resin from an injection port 3a, a second curve 3c, and a cavity 3b connected to the second curve 3c. The movable mold 4 has a first curve 4c and a cavity 4b. Then, as shown in FIG. 3 (b), when the movable mold 4 and the fixed mold 3 are clamped, the first curve 4c and the second curve 3c sequentially form S from the injection port 3a side of the sprue 3d. A letter-shaped introduction path Z is formed in a direction (arrow B direction: see FIG. 5) orthogonal to the film feeding direction (arrow A direction: see FIG. 5). The sprue 3d and the injection port 3a are provided at positions facing the first curve 4c when the fixed mold 3 and the movable mold 4 are combined and clamped.
[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 delivery rolls 5a and 6a and winding rolls 5b and 6b, and the continuous films 7 and 14 are wound therebetween.
[0013]
The first continuous film 7 and the second continuous film 14 are wound around and held by delivery rolls 5a and 6a, respectively, and the leading ends thereof pass between the fixed mold 3 and the movable mold 4 to take up the winding rolls 5b and 5b. Preparation is completed by being wound around 6b. Further, as shown in FIG. 5, the first continuous film 7 is set wider than the second continuous film 14.
[0014]
Here, as shown in FIG. 4A, a first continuous film 7 is formed on a base film 8 made of PET in this order by a release layer 9 made of a material having no adhesive property, and a UV for improving the surface hardness. A hard layer 10, an anchor layer 11, a printing layer 12, and an adhesive layer 13 for improving fixing of printing are laminated. In addition, as shown in FIG. 4B, the second continuous film 14 also has a release layer 16, a UV hard layer 17, an anchor layer 18, a print layer 19, and an adhesive layer 20 laminated on a base film 15. are doing.
[0015]
As shown in FIG. 5, the printed layers 12 and 19 are formed with a printed portion and a non-printed portion, and the transparent resin layer is removed from the non-printed portion on the back and front surfaces to form a transparent layer. Display window (see FIG. 1). The print layers 12 and 19 form 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 moved to the movable mold side so as to face the first curve 4 c. The continuous film 14 is disposed on the fixed mold side so as to face the second curve 3c. Then, the winding devices 5 and 6 are operated so that the feed direction of the first continuous film 7 (the direction of the arrow A) and the second continuous film 14 run in a state where the respective adhesive layers 13 and 20 face each other. It is intermittently fed between the fixed mold 3 and the movable mold 4. The intermittent feeding operation is controlled so that the print pattern always matches the cavity 3b of the fixed mold 3 and the cavity 4b of the movable mold 4.
[0017]
Next, the resin injection step will be described with reference to FIGS. As shown in FIG. 6A, 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 thereafter, as shown in FIG. Then, the fixed mold 3 and the movable mold 4 are aligned and clamped.
[0018]
As shown in FIG. 7A, after the movable mold and the fixed mold are combined, a transparent resin is injected from the sprue 3d through the injection port 3a. The injected transparent resin travels along the first curve 4c, and at this time, the force of the flowing resin is not applied to the end 7a of the first continuous film 7 facing the first curve 4c. That is, the transparent resin injected from the injection port 3a enters the first curve 4c, and its traveling direction X 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 below 7a. For this reason, the injected transparent resin does not go inside the first continuous film 7, and the first continuous film 7 can be reliably pressed toward the cavity 3b.
[0019]
As shown in FIG. 7B, the transparent resin that fills the first curve 4c advances on the second curve 3c, and at this time, the end 14a of the second continuous film 14 facing the second curve 3c. Does not apply the force of the flowing resin. That is, the transparent resin satisfying the first curve 4c enters the second curve 3c, and its traveling direction Y is directed toward the fixed mold 3, and the end of the second continuous film 14 on the movable mold 4 side. Get over the part 14a. Therefore, the transparent resin that satisfies the first curve 4c does not go around the inside of the second continuous film 14, and can reliably press the second continuous film 14 toward the cavity 4b.
[0020]
As shown in FIG. 7C, the transparent resin that satisfies the second curve 3c presses the first continuous film 7 and the second continuous film 14 toward the fixed mold and the movable mold, while the cavity 3b, 4b, a molded article 21 integrated with the first continuous film 7 and the second continuous film 14 is formed.
[0021]
Then, as shown in FIG. 7D, after the molded product 21 is cured, the fixed mold 3 and the movable mold 4 are opened, and the molded product 21 is formed by the adhesive force between the sprue forming portion 21a formed on the sprue 3d. The molded product 21 is extruded in a state where it is left on the fixed mold side, and the molded product 21 is sucked out by a vacuum type take-out machine (not shown). Thereby, both the first continuous film 7 and the second continuous film 14 separate the molded product 21 and the continuous films 7 and 14 between the release layers 9 and 16 and the UV hard layers 10 and 17.
[0022]
Thereafter, the sprue forming portion 21a, which is the forming portion remaining on the sprue 3d, is cut and removed, and the protective panel P1 is formed.
[0023]
As described above, the first continuous film 7 is passed through the stationary mold 3 so as to face the first curve 4c, and the second continuous film 7 is passed through the movable mold 4 so as to face the second curve 3c. After passing through 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 molding the molded article 21 by using this method, it is possible to prevent the transparent resin from entering between the continuous film and the mold. In addition, by adopting a molding method that does not perform perforation, it is possible to prevent cut dust generated during drilling work from being mixed into the molded product 21 and prevent dents in the molded product 21 to improve the yield of the molded product 21. I can do it.
[0024]
Note that the introduction path Z may be any direction that is a direction that intersects the film feeding direction (the direction of the arrow A: see FIG. 5) and that exits the first continuous film 7 and is limited to the shape of the present embodiment. Not something. For example, as shown in FIG. 8A, two print patterns are arranged in a direction intersecting the film feeding direction (the direction of arrow A) and formed so as to be connected from one introduction path Z to two print patterns. The branch point Za of Z may be formed outside the first continuous film 7 (common to the injection port 3a).
[0025]
Further, as shown in FIG. 8B, two print patterns are arranged in a direction intersecting with the film feed direction (the direction of arrow A) and formed so as to be connected from one introduction path Z to two print patterns. The branch point Za of Z may be formed in the area of the second continuous film 14.
[0026]
Further, as shown in FIG. 8C, two print patterns are arranged so that the connection part Zb with the introduction path Z faces in the film feed direction (the direction of arrow A), and the two print patterns are formed from one introduction path Z. It may be formed so as to be connected, and the branch point Za of the introduction path Z is arranged in the area of the second continuous film 14 and between the two printing patterns.
[0027]
[Other embodiments]
Next, another embodiment of the double-sided in-mold molding method according to the present invention will be described with reference to the drawings. FIG. 9 is an explanatory diagram of a fixed mold and a movable mold according to the present embodiment. The same parts as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted.
[0028]
In the present embodiment, a fixed mold 31 and a movable mold 32 as shown in FIG. 9 are used instead of the fixed mold 3 and the movable mold 4 according to the first embodiment.
[0029]
The fixed mold 31 is formed with a sprue 31d for injecting a transparent resin from an inlet 31a, a first curve 31c connected to the sprue 31d, and a cavity 31b. The movable mold 32 has a second curve 32c and a cavity 32b connected to the second curve 32c. Then, as shown in FIG. 9, when the fixed mold 31 and the movable mold 32 are clamped, an S-shape is formed by the first curve 31c and the second curve 32c in order from the injection port 31a side of the sprue 31d. The introduction path Z is formed in a direction (arrow B direction: see FIG. 5) orthogonal to the film feeding direction (arrow A direction: see FIG. 5). Also, by providing a width difference between the first continuous film 33 and the second continuous film 34, the second continuous film 34 is fixed so that the first continuous film 33 faces the second curve 32c on the movable mold side. It is arranged on the mold side so as to face the first curve 31c.
[0030]
Using the fixed mold 31 and the movable mold 32, the first continuous film 33 is passed through the fixed mold 31 so as to face the second curve 32c, and the first continuous film 33 is placed on the movable mold 32 side. The second continuous film 34 is passed through the second continuous film 34 so as to oppose the curve 31c of the first continuous film 33 and the second continuous film 33 from the S-shaped introduction path Z after the movable mold 32 and the fixed mold 31 are combined. By molding the molded article 21 by injecting the transparent resin between the continuous film and the mold, it is possible to prevent the transparent resin from entering between the continuous film and the mold. In addition, by adopting a molding method that does not perform perforation, it is possible to prevent cut dust generated during drilling work from being mixed into the molded product 21 and prevent dents in the molded product 21 to improve the yield of the molded product 21. I can do it.
[0031]
Further, in the present embodiment, since the second continuous film 34 passes through the movable mold 32 on which the injection port 31a is not provided, the second continuous film 34 passes through a position facing the injection port 31a. Can be done. In such a case, it is possible to more reliably prevent the transparent resin from entering between the second continuous film 34 and the movable mold 32.
[0032]
【The invention's effect】
As described above, the first continuous film is passed through the fixed mold side such that one end faces the curve of the movable mold, and one end faces the curve of the fixed mold on the movable mold side. After passing through the second continuous film, the movable mold and the fixed mold are combined, and then the resin is injected between the first continuous film and the second continuous film from the S-shaped introduction path to form the molded product. Is molded. In this way, by adopting a molding method that does not perform perforation, it is possible to prevent cut dust from being mixed into the molded product and prevent dents in the molded product, thereby improving the yield of the molded product.
[Brief description of the drawings]
FIG. 1 is a perspective view of a protection panel formed by a manufacturing method according to a first 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.
FIG. 3 is a 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 an explanatory diagram of a method of manufacturing a protection panel.
FIG. 7 is an explanatory diagram of a method of manufacturing the protection panel.
FIG. 8 is a diagram illustrating an arrangement of an introduction path and a print pattern.
FIG. 9 is an explanatory view of a fixed mold and a movable mold according to another embodiment.
[Explanation of symbols]
P1, P2 protection panel Z introduction path 1a plate 1b frame 1c display window 2a plate 2b one point 3, 31 fixed mold 3a, 31a injection ports 3b, 4b, 31b, 32b Cavities 3c, 32c second curves 3d, 31d sprue 4, 32 movable molds 4c, 31c first curves 5, 6 winding devices 5a, 6a rolls 7, 33 first continuous film 7a , 14a ... end portions 8, 15 ... base films 9, 16 ... release layers 10, 17 ... UV hard layers 11, 18 ... anchor layers 12, 19 ... print layers 13, 20 ... adhesive layers 14, 34 ... second continuous film 21: molded product 21a: sprue forming part

Claims (3)

A double-sided in-mold molding method comprising a fixed mold and a movable mold having a cavity for molding a molded product, and a first continuous film and a second continuous film each having a printed layer formed on surfaces facing each other and passing in parallel. At
The fixed mold and the movable mold each have one of a first curve and a second curve, and when the mold is clamped, the fixed mold outside the passing range of the first continuous film and the second continuous film. On the mold side, an S-shaped introduction path having a first curve and a second curve is formed in the direction intersecting with the film feeding direction in order from the injection port side of the sprue opened to face the movable mold. ,
On the fixed mold side, a first continuous film is passed so that one end faces the curve of the movable mold, and on the movable mold side, a second continuous film is formed such that one end faces the curve of the fixed mold. Passing the film through;
Molding the molded product by injecting a 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, and , A double-sided in-mold molding method. A double-sided in-mold molding method comprising a fixed mold and a movable mold having a cavity for molding a molded product, and a first continuous film and a second continuous film each having a printed layer formed on surfaces facing each other and passing in parallel. At
The fixed mold has a second curve connected to the cavity,
The movable mold has a first curve facing a sprue formed in a fixed mold,
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 injection port side of the sprue is formed in a direction intersecting the film feeding direction,
On the fixed mold side, while passing the first continuous film so that one end faces the first curve, and on the movable mold side, the second continuous film so that one end faces the second curve. Passing through,
Molding the molded product by injecting a 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, and , A double-sided in-mold molding method. A double-sided in-mold molding method comprising a fixed mold and a movable mold having a cavity for molding a molded product, and a first continuous film and a second continuous film each having a printed layer formed on surfaces facing each other and passing in parallel. At
The fixed mold has a first curve connected to a sprue formed in the fixed mold,
The movable mold has a second curve connected to the cavity,
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 injection port side of the sprue is formed in a direction intersecting the film feeding direction,
On the fixed mold side, while passing the first continuous film so that one end faces the second curve, and on the movable mold side, the second continuous film such that one end faces the first curve. Passing through,
Molding the molded product by injecting a 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, and , A double-sided in-mold molding method.

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