JP2013154474A - Method of manufacturing frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively manufacture a frame having an opening periphery formed step-wise using an in-mold molding technique.SOLUTION: A frame 10 includes in a periphery 16 of an opening 15 into which a plate-like component 20 is fitted from above, an edge part 13 supporting an lower surface periphery of the plate-like component 20 from below, wherein the periphery of the opening is formed step-wise. A method of manufacturing the frame includes the steps of: using molds (41, 42) which vertically open and close and bridging a transfer film 43 across the molds, the transfer film 43 being formed by laminating a decorative film 62 below a base film 61; arranging in a lower mold, a plate-like separating member 70 having an upper surface shape of the opening and a thickness equivalent to the difference in level of the step while causing the plate-like separating member 70 to face the surface of a decorative film; and injecting molten resin 110 into the molds in a closed state and performing in-mold molding of the frame while transferring the decorative film onto the resin; and removing a separating member after the in-mold molding.

Description

  The present invention relates to a method for manufacturing a frame. Specifically, the frame has an opening into which a plate-like component is fitted from above, has no gap between the periphery of the opening and the outer periphery of the plate-like component, and is decorated on the outer surface. The present invention relates to a method for manufacturing the product by an in-mold molding technique.

  As an example of a product or part in which a plate-like component is fitted in a frame body, almost the entire area of the front surface called a smartphone is composed of a display panel such as a display device or a touch panel that serves as both a display device and an input device. There is a front cover of the functional mobile phone. FIG. 1 shows an example of the front cover 1a. FIG. 1A is a perspective view showing the appearance of the front cover 1a, and FIG. 1B is a cross-sectional view taken along the line aa in FIG. FIG. 2 is a perspective view in which the front cover 1a is disassembled for each component. The front cover 1a is a substantially rectangular dish-shaped component with a shallow bottom that constitutes the front side of an exterior case for housing the internal circuit of the smartphone. Such a front cover 1a has a plate-like glass (glass plate) 20 as a plate-like component, and the glass plate 20 is formed in a region corresponding to the bottom of the dish of the frame 10a made of an integrally molded product of resin. The structure is arranged inside the opening 15. In such a front cover 1a, when the direction in which the glass plate 20 faces outward is upward, the glass plate 20 transmits the display on the display panel arranged on the lower surface 22 side to the upper surface 11 side, It has a function of protecting the display panel.

  The front cover 1a has no height difference between the upper surface 11 of the frame 10a and the upper surface 21 of the glass plate 20, and is often flush. As shown in FIG. 1B, an edge 13 is formed on the inner periphery of the frame body 10a by cutting it from the upper side to the lower side with the thickness of the glass plate 20 to make it thinner. The upper surface 14 of the part 13 supports the periphery of the lower surface 22 of the glass plate 20 from below. Such a front cover 1a is usually assembled by manufacturing only the frame body 10a by injection molding and fitting the glass plate 20 into the inner periphery of the frame body 10a. That is, the glass plate 20 is fitted into the opening 15 of the frame body 10 from above with the edge 13 of the frame body 10a as a support. Note that the upper surface 14 of the edge 13 and the lower surface 22 of the glass plate 20 in contact therewith are fixed using an adhesive or the like.

  By the way, the frame 10a constituting the front cover 1a of the smartphone is decorated on a surface (hereinafter referred to as an outer surface) exposed outward as an exterior case, such as the upper surface 11 of the frame 10a or the outer surface of the side wall 18. May be applied. As decoration, it may be applied to a part of the outer surface of the frame 10a such as a product logo, or it may be applied to the entire outer surface by imitating other materials (metal etc.). It may be a pattern. A well-known in-mold molding technique is used for such decoration. In-mold molding technology is a film (decoration) in which a film (decoration pattern) or the like that imitates a design or letter to be decorated on a film (hereinafter referred to as “substrate film”) or a pattern imitating another material (hereinafter referred to as “decoration pattern”). The molten resin is injected in a state in which the transfer film in which the film is laminated in the mold of the injection molding machine, and the decorative film is transferred to the resin by the heat of the molten resin. Note that more specific contents of the in-mold molding technique are described in the following Patent Documents 1 and 2 and the like.

JP-A-4-208423 Japanese Patent Laid-Open No. 9-225959

  When the conventional in-mold molding technique including the techniques described in Patent Documents 1 and 2 is applied to the frame targeted by the present invention, various problems occur. The above problem will be described in detail by taking the front cover 1a of the smartphone shown in FIGS. 1 and 2 as an example. The front cover 1a has the glass plate 20 in a state where the glass plate 20 is fitted in the frame 10a. Is formed so as to be smoothly continuous with the outer surface of the frame 10a. Moreover, it is ideal that there is no gap between the outer peripheral edge 23 of the glass plate 20 and the opening peripheral edge 16 of the frame 10a. This is because dust or the like enters the gap, or a finger tracing the upper surface 21 of the glass plate 20 from the outer surface of the frame body 10a is hindered, and the integral and smooth tactile sensation is hindered, or the design is impaired by discontinuity. This is to prevent it from happening.

  FIG. 3 shows an explanatory diagram of this gap. FIG. 3 is an enlarged view corresponding to the circle 100 in FIG. The fact that there is no gap between the opening peripheral edge 16 of the frame 10a and the outer peripheral edge 23 of the glass plate 20 means that the opening peripheral edge 16 of the frame 10a is the upper surface of the frame 10a as shown in FIG. 11 is a horizontal plane, and is bent downward at a right angle from the upper surface 11 of the frame body 10a to form a wall surface 17 perpendicular to the vertical direction, and the wall surface 17 is bent inward of the opening 15 at the lower end. It is formed so as to be continuous with the edge 13 that supports the glass plate 20. That is, the shape from the upper surface 11 of the frame body 10a through the wall surface 17 of the opening peripheral edge 16 to the edge portion 13 is stepped. Thus, when a glass plate 20 having a planar shape that matches the shape of the upper surface of the opening 15 of the frame body 10a is fitted into the opening 15, the surface that forms the outer peripheral edge 23 of the glass plate 20 and the opening 15 of the frame body 10a. Will face the inner wall surface 17 without any gap.

  However, in the case where the outer surface of the frame 10a is decorated by in-mold molding, if the peripheral edge 16 of the opening 15 is stepped as shown in FIG. Or wrinkles on the decorative film transferred to the frame 10a. FIG. 4 is a view for explaining this problem, and schematically shows molds (41a, 42a) for in-mold forming the frame 10a. In this figure, a state in which the molds (41a, 42a) are closed is shown by a sectional view, FIG. 4 (A) is an overall view of the molds (41a, 42a), and (B) is ( It is an enlarged view in circle 101 in A). Further, the vertical direction of the molds (41a, 42a) is defined based on the vertical direction of the frame 10a shown in FIGS.

  As shown in FIG. 4, the cavity 43 when the molds (41a, 42a) are closed has an edge 44 corresponding to the stepped bent portion of the opening periphery 16 in the frame 10a. become. The transfer film 60 is stretched over the molds (41a, 42a) along this stepped shape. If in-mold molding is performed in this state, the transfer film 60 may be cut by the edge 44. When the transfer film 60 is cut, dust such as a cut piece of the transfer film 60 in the mold (41a, 42a) remains, and each time the in-mold molding is performed, the mold (41a, 42a). It is necessary to remove the dust inside, and the maintenance cost of the molds (41a, 42a) increases.

  Further, even if the transfer film 60 is not cut, the transfer film 60 is suddenly bent at the position of the edge 44 corresponding to each corner of the stepped cross section extending downward from the opening periphery 16 of the frame 10a. The transfer film 60 tends to wrinkle. Accordingly, there is a high possibility that the decorative film peeled off from the transfer film 60 is not normally transferred to the resin constituting the frame body 10a and is poorly decorated.

  Certainly, it is conceivable to form a staircase shape at the periphery of the opening of the frame using a mold having a slide mechanism. FIG. 5 is a partially enlarged cross-sectional view of an example of a mold 40b provided with the slide mechanism. This figure corresponds to the rectangular region 102 shown in FIG. 4A. In the illustrated example, the molds (41b, 42b) which are divided into upper and lower parts in order to form the edge part 13 as an overhang part. In addition, a slide core 44 that moves to the left and right is shown. Thus, if the slide mechanism for moving the slide core 44 is provided in the mold 40b, the transfer film 60 is not bent during in-mold molding, and the transfer film 60 can be prevented from being broken. However, the mold 40b having the slide mechanism is complicated and expensive, and the manufacturing cost of the frame 10a increases.

  Thus, with the conventional in-mold molding technique, it is difficult to form the opening periphery of the frame body in a stepped manner at a low cost, and in fact, the opening edge of the frame body has a gentle R shape. FIG. 6 illustrates an actual frame 10b. In this figure, an enlarged cross section of a part of the front cover 1b in which the glass plate 20 is fitted is shown in the opening 15 of the frame 10b, and the enlarged portion is the same as the cross sectional view shown in FIG. Corresponds to the position. As shown in the figure, the actual frame body 10 b has an opening peripheral edge 16 that is not stepped but has a gentle curve from the upper surface 11 toward the upper surface 14 of the edge 13. This prevents breakage and poor decoration of the transfer film during in-mold molding. However, in the frame body 10 b, a gap d is generated between the opening edge portion 16 and the outer peripheral edge 23 of the glass plate 20.

  Therefore, an object of the present invention is to provide a method for manufacturing a frame having a stepped peripheral edge at a lower cost while using an in-mold forming technique.

The present invention for achieving the above object is a method for producing a frame integrally formed of resin,
The frame body has an opening into which a plate-shaped component is fitted from above, with one of the front and back surfaces as an upper surface, and has an edge portion that supports the lower surface periphery of the plate-shaped component at the periphery of the opening. The peripheral upper surface and the upper surface of the edge are formed in a stepped shape,
Using upper and lower molds that open and close in a direction that matches the vertical direction of the frame,
A transfer film erection step for bridging the mold with a transfer film for in-mold molding in which a decorative film is laminated on the lower surface side of the base film;
A plate-like free member having a planar shape that matches the upper surface shape of the opening and having a thickness corresponding to a step from the upper surface of the peripheral edge of the opening to the upper surface of the edge portion is formed on the transfer film. A free member placement step for placing in the lower mold while facing the surface of the decorative film,
An in-mold molding step of molding the frame while injecting the molten resin into the mold in a closed state and transferring the decorative film to the resin;
A free member removing step of removing the free member in a state of being arranged inside the opening of the frame after the in-mold forming step;
It is set as the manufacturing method of the frame containing.

  The release member may be a plate-like glass or a plate-like steel material. When the release member is a plate-like steel material, the upper surface of the release member has an adhesive property with the decorative film. It is more preferable that a surface treatment for suppression is performed.

  In any one of the above-described frame body manufacturing methods, an engagement structure may be configured between the lower surface of the release member and the inner surface of the lower mold.

  When the free member is a plate-like glass, the free member is used as the plate-like component fitted into the frame formed by the in-mold forming step after being removed by the free member removing step. It may be a thing.

  According to the method for manufacturing a frame according to the present invention, the opening edge of the frame is increased without increasing the manufacturing cost and the maintenance cost of the mold while decorating the outer surface of the frame by in-mold molding. It can be shaped like a staircase. For this reason, a product made by fitting a plate-like part into the frame has no gap between the opening edge of the frame and the outer peripheral edge of the plate-like part, so that no dust is mixed into the opening of the frame and tactile sensation. And aesthetics. In addition, the product can be provided at low cost.

It is a figure which shows the external appearance of the front cover of a smart phone. It is a disassembled perspective view of the said front cover. It is a figure which shows the ideal shape of the frame which comprises the said front cover. It is a figure for demonstrating the problem at the time of carrying out the in-mold shaping | molding of the said ideally shaped frame. It is a figure which shows an example of the metal mold | die provided with the slide mechanism for in-mold-molding the said ideally shaped frame. It is a figure which shows the realistic shape of the said frame. It is a figure which shows the external appearance of the frame manufactured by the method based on the Example of this invention. It is a figure which shows the structure of the frame manufactured by the method which concerns on the said Example. It is a figure which shows the structure of the transfer film used in the manufacturing method which concerns on the said Example. It is a figure which shows the flow of the manufacturing method which concerns on the said Example. It is a figure which shows the outline of the manufacturing method which concerns on the other Example of this invention.

  As an example of the frame manufactured by the method of the present invention, a frame for a front cover of a smartphone is given. And the manufacturing method of the frame for the front cover is demonstrated as an Example of this invention.

=== Example ===
<Appearance and structure of frame>
FIG. 7 is a schematic view of the frame 10 manufactured by the method according to the present embodiment. In this figure, a state in which the glass plate 20 is fitted into the frame body 10 to form the front cover 1c is shown. Also here, the vertical relationship of the frame 10 is defined as shown in FIGS. 1 and 2, and FIG. 7A is a perspective view when the front cover 1c is viewed from above ( B) is a perspective view when viewed from below. 8 is a cross-sectional view of the frame body 10. FIG. 8A shows a cross section taken along the line bb in FIG. 7A, and FIG. 8B shows the inside of the circle 103 in FIG. 8A. An enlarged view of is shown. Similar to the frame 10a shown in FIG. 1, the frame 10 has a substantially rectangular dish shape with a shallow bottom, and has an opening 15 in a portion corresponding to the bottom surface of the dish. And the glass plate 20 is arrange | positioned in the opening 15, and the front cover 1c is formed.

  As shown in FIG. 7, the outer appearance of the frame 10 manufactured by the method according to the present embodiment has almost the same appearance as the frame 10a constituting the general front cover 1a shown in FIG. doing. Further, as shown in FIG. 8, the structure in which the lower surface 22 of the glass plate 20 is supported by the upper surface 14 of the edge 13 of the frame 10 is the same. The difference in structure is that the frame 10 has a structure in which a decorative layer 50 made of a film in which a decorative design is formed is adhered to the entire outer surface of the frame main body 10c made of a resin molded product. is there. In FIG. 8, the thickness of the decorative layer 50 is exaggerated so that the detailed structure of the frame 10 can be easily understood.

  However, the manufacturing method according to the present embodiment is not characterized in the structure of the frame body 10 after manufacture, and the opening edge portion 16 of the frame body 10 is formed without using an expensive mold having a slide mechanism. It is characterized in that it can be accurately decorated on the outer surface of the frame body 10c by using an in-mold molding technique while forming in a stepped shape. Hereinafter, the manufacturing method of this frame 10 is demonstrated as an Example of this invention.

<Transfer film>
In the present embodiment, an in-mold molding technique is used to decorate the outer surface of the frame body 10c. As is well known, the in-mold molding technique can perform resin integral molding and decoration at the same time by performing injection molding while placing a transfer film in a mold. FIG. 9 shows a partially broken perspective view of a general transfer film 60 used for the in-mold molding. The transfer film 60 basically has a structure in which a decorating film 62 is laminated on a base film 61. The base film 61 includes only a base body 63 made of a film material such as a PET film and a decorating film 62. It has a structure in which a release layer 64 for correctly peeling from the base film 61 is laminated. On the other hand, the decorative film 62 includes a decorative layer 66 on which a decorative design is formed by printing, vapor deposition, or the like, with a protective layer 65 disposed on the base film 61 side and a molten resin facing outward. The structure is sandwiched between adhesive layers 67 having compatibility. In in-mold molding, peeling is performed at the boundary between the release layer 64 and the protective layer 65.

<Manufacturing method>
FIGS. 10A to 10E show the flow of the manufacturing method according to this example. The molds (41, 42) for forming the frame body 10 include a mold 41 (hereinafter referred to as an upper mold) having an inner surface shape that follows the shape of the upper surface 11 of the frame body 10, and the lower surface 12 of the frame body 10. This is similar to a mold (hereinafter referred to as a lower mold) 42 having an inner surface shape along the shape. In this case as well, the vertical direction of the molds (41, 42) is defined based on the vertical direction of the frame 10.

  First, the transfer film 60 is stretched over the upper mold 41 (A). At this time, in the transfer film 60, the base film 61 side is stretched over so as to face the inner surface 43 of the upper mold 41. Next, from the upper surface 11 of the opening edge 16 to the upper surface 14 of the edge 13 while matching the shape of the glass plate fitted into the opening 15 of the frame 10, that is, the shape of the upper surface of the opening 15 of the frame 10. A member (free member) 50 having a thickness corresponding to the step is disposed on the lower mold 42 side with respect to the transfer film 60 (B). That is, the upper surface 71 side of the release member 70 and the decorating film 62 side of the transfer film 60 face each other. In the present embodiment, the same member as the glass plate 20 that is actually fitted in the frame body 10c in the state of the front cover 1c is used as the release member 70. Further, in the upper and lower molds (41, 42) shown here, the lower mold 42 is formed with a suction part 45 communicating with the outside, and the air of the suction part 45 of the lower mold 42 is formed. Is released to the outside so that the release member 70 is attracted to the inner surface of the lower mold 42 and is held in a positioned state. Of course, if the release member 70 can be held in the mold (41, 42), the suction portion 45 is not essential. If the lower mold 42 is literally positioned vertically downward, the release member 70 can also be “placed” on the inner surface of the lower mold 42.

  Next, the molds (41, 42) are closed and clamped. Thereby, the cavity 43 filled with the molten resin 110 which finally becomes the frame body 10 is formed (C). Then, the molten resin 110 is injected into the cavity 43 through the gate portion 46 (D). At this time, the decorative film 62 side of the transfer film 60 comes into contact with the molten resin 110, and the contact surface is in a compatible state. At this time, the transfer film 60 is sandwiched between upper and lower molds (41, 42) so as to smoothly follow the inner surface of the upper mold 41 and the upper surface 71 of the release member 70, and bends with a corner. There is no.

  When the molten resin 110 cools, the frame main body 10c is molded, the decorative film 62 is peeled off from the base film 61, and the decorative film 62 is adhered to the outer surface of the frame main body 10c, and the decorative design is transferred. Then, the frame body 10 is formed. On the other hand, the surface of the release member 70 that contacts the decorative film 62 is not in contact with the molten resin 110, and the decorative film 62 does not peel from the base film 61. That is, the decorative design is not transferred to the upper surface 21 of the release member 70. Moreover, glass has the property that adhesiveness with the film 62 for decorating is low, and a decorating design is fundamentally difficult to transfer. That is, the decorative design can be selectively transferred only to the outer surface of the frame body 10c with high accuracy.

  Further, in the cavity 43, since the molten resin 110 is filled along the rectangular shape of the outer peripheral edge of the plate-shaped release member 70, the opening peripheral edge 16 is formed in a stepped shape toward the edge 13 while being bent at a right angle. The And as above-mentioned, in the metal mold | die (41,42), the transfer film 60 does not bend in a sharp state by the releasing member 70. FIG. Therefore, the transfer film 60 does not break during the in-mold molding, the wrinkles on the decorative film 62, or the decorative film 62 does not remain in the mold (41, 42). Therefore, the stepped shape of the opening peripheral edge 16 of the frame main body 10c can be formed with high accuracy at a very low cost. Finally, the molds (41, 42) are opened to take out the frame 10 that is a molded body, and the release member 70 that is fitted inside the opening 15 of the frame 10 is removed (E).

  When the glass plate 20 is fitted into the frame 10 manufactured as described above and assembled to the front cover 1c shown in FIG. 7, the upper surfaces (11, 21) of both the frame 10 and the glass plate 20 are continuous surfaces. As a result, no gap is formed between the opening periphery 16 of the frame 10 and the outer periphery 23 of the glass plate 20, and dust or the like does not enter the opening periphery 16 of the frame 10. Moreover, since the said frame 10 does not have said clearance gap, it becomes the thing excellent also in tactile sense and the designability. Furthermore, the release member 70 is reusable. It can be easily replaced even if worn or damaged, and is extremely inexpensive unlike parts (such as a slide core) that constitute a mold. Therefore, even if the release member 70 is replaced, it does not lead to a large cost increase. Moreover, if the release member 70 is the glass plate 20 itself employ | adopted as the front cover 1c, after forming the frame 10 using a glass plate as the release member 70, the release member 70 will be the frame 10 after manufacture. And the front cover 1c is assembled to the front cover 1c. In this case, the release member 70 itself becomes a part of the front cover 1c, so that the final cover including the front cover 1c and the front cover 1c is included. Cost reduction of products (such as smartphones) can also be expected.

=== Other Embodiments ===
In the said Example, the raw material of the release member 70 was glass. Further, the release member 70 was equivalent to the glass plate 20 constituting the front cover 1c. The glass plate 20 that is actually fitted to the frame 10 in the front cover 1c is often subjected to various surface treatments such as the formation of a reinforced coating or an antireflection coating, In comparison, the anti-transfer property of the decorative film 62 at the time of in-mold molding is extremely excellent, but it is expensive. Therefore, when manufacturing the frame 10, it is practical to use a glass plate having only the same shape as the release member 70.

  Of course, as long as the shapes coincide with each other, not only the glass plate but also, for example, a cheaper plate-shaped steel material (stainless steel plate or the like) can be used as the release member 70. When a plate-shaped steel material is used, it is more advantageous in terms of durability and cost than a glass plate. On the other hand, since the adhesion of the transfer film 60 to the decorating film 62 is higher than that of glass, the decorating film 62 may be transferred to the free member 70 made of this steel during in-mold molding. Therefore, the release member 70 made of a plate-shaped steel material may be subjected to a surface treatment (for example, applying a fluororesin) on the surface in contact with the transfer film 60 to prevent the decoration film 62 from being transferred. Good. In any case, the material and surface treatment of the release member 70 may be appropriately determined in consideration of the manufacturing cost, the maintenance cost, and the like.

  In the above embodiment, the release member 70 has a simple plate shape, but when placed in the mold (41, 42), it can be easily aligned with the lower mold 42. You may comprise an engagement structure. For example, as shown in FIG. 11, a protrusion 172 may be provided on the surface 171 that contacts the lower mold 142 of the release member 170, and a recess 47 corresponding to the protrusion 172 may be provided on the lower mold 142. . Of course, the lower mold may be provided with a protrusion. In this case, the height of the protrusion needs to be equal to or less than the thickness of the plate-like free member. Further, if the protrusion 172 of the release member 170 and the recess 47 of the lower mold 142 are engaged with each other in a fitted state, a configuration and structure for holding the release member 170 such as the suction portion 45 may not be provided separately. Good.

  As a matter of course, the embodiment of the present invention is not limited to the manufacturing method of the frame constituting the front cover of the smartphone, but a flat panel display provided in a mobile phone, a portable music terminal, an in-vehicle navigation system, or the like. There are a wide variety of objects such as frames to be fitted, digital camera viewfinders and display frames. Of course, the plate-like member fitted in the frame is not limited to the glass plate or the flat panel display. Further, the opening shape of the frame, that is, the shape of the plate-like component fitted into the frame is not limited to a substantially rectangular shape, and may be an appropriate shape such as a polygon or a circle. The manufacturing method of the present invention can be applied no matter how complicated the top surface shape of the plate member is.

  The present invention is suitable for a manufacturing method of a front cover or the like that protects a display panel such as a touch panel of a smartphone.

1a-1c, front cover, 10, 10a, 10b frame, 10c, frame body,
13 edge, 14 upper surface of edge, 15 opening of frame, 16 opening edge of frame,
20 plate-like parts (glass plate), 21 upper surface of glass plate, 22 lower surface of glass plate,
40b, 41, 41a, 41b, 42, 42a, 42b, 142 mold,
44 Slide core, 43 cavity, 46 gate part, 47 concave part of mold,
50 decorative layer of frame, 60 transfer film, 62 film for decorating transfer film,
70,170 Free member, 110 Molten resin, 172 Free member protrusion

Claims (6)

A method of manufacturing a frame integrally molded with resin,
The frame body has an opening into which a plate-shaped component is fitted from above, with one of the front and back surfaces as an upper surface, and has an edge portion that supports the lower surface periphery of the plate-shaped component at the periphery of the opening. The peripheral upper surface and the upper surface of the edge are formed in a stepped shape,
Using upper and lower molds that open and close in a direction that matches the vertical direction of the frame,
A transfer film erection step for bridging the mold with a transfer film for in-mold molding in which a decorative film is laminated on the lower surface side of the base film;
A plate-like free member having a planar shape that matches the upper surface shape of the opening and having a thickness corresponding to a step from the upper surface of the peripheral edge of the opening to the upper surface of the edge portion is formed on the transfer film. A free member placement step for placing in the lower mold while facing the surface of the decorative film,
An in-mold molding step of molding the frame while injecting the molten resin into the mold in a closed state and transferring the decorative film to the resin;
A free member removing step of removing the free member in a state of being arranged inside the opening of the frame after the in-mold forming step;
including,
A manufacturing method of a frame body characterized by the above.   2. The method of manufacturing a frame according to claim 1, wherein the release member is plate-like glass.   2. The method of manufacturing a frame according to claim 1, wherein the free member is a plate-shaped steel material.   The method for manufacturing a frame according to claim 3, wherein a surface treatment is performed on the upper surface of the release member to suppress adhesion to the decorative film.   The method of manufacturing a frame body according to any one of claims 1 to 4, wherein an engagement structure is formed between a lower surface of the release member and an inner surface of the lower mold.   3. The release member according to claim 2, wherein the release member is used as the plate-like component fitted in the frame body formed by the in-mold forming step after being removed by the release member removing step. The manufacturing method of the frame which makes it.

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