JP5401076B2 - Two-color molding simultaneous painting equipment molding equipment - Google Patents

Description

  The present invention relates to a molding apparatus for two-color molded simultaneous painting articles, which is suitable for mobile phone casings, front panels of AV equipment and home appliances, instrument panels of automobiles, and the like.

  A two-color molding method is known in which two types of molding resins having different colors and materials are sequentially injected into a mold to produce a two-color molded product.

  A two-color molding simultaneous painting method is also known as a method of painting on the surface of a two-color molded product. In this painting method, a painting sheet with a pattern or the like formed on the base sheet surface is sandwiched in a mold and clamped, and molten resin is injected into the mold cavity, and at the same time, the painting is applied to the injection molded product. The pattern of the sheet is bonded and integrated (for example, see Patent Document 1).

  (A)-(d) of FIG. 17 shows each process of the said 2 color shaping | molding simultaneous painting method.

  First, in FIG. 17A, the painting sheet 60 is inserted into the cavity mold 61 and is placed along the cavity surface 62, and the core mold 63 and the cavity mold 61 are clamped to provide the core mold 63. The painting sheet 60 is sandwiched between the tip end portion 64 a of the slide block 64 and the cavity surface 62.

  Next, as shown in FIG. 17B, the primary molding resin R1 is injected into the primary molding portion D3.

  Next, as shown in FIG. 17C, after the primary molding resin R1 is cured, the slide block 64 is retracted.

  Next, as shown in FIG. 17D, the secondary molding resin R2 is injected into the secondary molding portion D4 formed in the mold by the retraction of the slide block 64.

  After the secondary molding resin R2 is cured, the cavity mold 61 and the core mold 63 are opened, and the two-color molded product is taken out from the mold.

  The primary molding resin R1 is usually colored because it is arranged on the back side of the two-color molded product, whereas the secondary molding resin R2 is arranged on the front side, so that a transparent resin is used. The Therefore, if the painting sheet 60 is made transparent in the range corresponding to the secondary molding resin R2, a two-color molded simultaneous painting product having a transparent window at the center can be molded.

There is also known a method for producing a two-color molded simultaneous painting product that forms a good-looking pattern on one or both of different materials (for example, see Patent Document 2).
JP 10-44190 A JP-A-9-183139

  However, in the molding method of the two-color molded simultaneous painting product described in Patent Document 1 described above, the surface of the two-color molded product is sinked depending on the joining structure and thickness of the primary molding resin R1 and the secondary molding resin. Or when the secondary molding resin is injected, the colored primary molding resin R1 may be melted and dragged by the transparent secondary molding resin. .

  Further, in the method in which the tip end portion 64a of the slide block 64 is pressed against the cavity surface 62 through the painting sheet 60, a dent scratch may remain on the appearance of the obtained two-color molded product or a resin burr may be generated. is there. Both of these deteriorate the decorativeness of the two-color molded product. The reason for the occurrence of the resin burr is that the cavity mold 61 and the slide block 64 are abutted in the primary molding, but a slight gap is provided so that the slide block 64 is not wrinkled. Because it invades.

  Moreover, in the said patent document 2, the primary molding resin part to which the painting sheet | seat was adhere | attached by insert-molding with a cavity type | mold and a primary shaping | molding core type | mold is left in a cavity type | mold, and the core type for secondary shaping | molding is the cavity. Inject the secondary molding resin into the cavity formed between the cavity mold and the secondary molding core mold, facing the mold, and paint on both or one of the primary molding resin part and the secondary molding resin part. Since the sheet is bonded, secondary molding can be performed without generating the above-described scratches.

  However, in this molding method, it is necessary to make the cavity mold into an undercut shape so that the primary molding resin portion is not separated from the cavity mold, so that the shape of the product to be molded is limited.

  The present invention has been made in consideration of the problems in the conventional two-color molding simultaneous painting product molding method as described above, and causes the appearance of the product to cause sink marks, resin flow, dent scratches, and resin burrs. The present invention provides a molding apparatus for two-color molded simultaneous painting products that can form two-color molded simultaneous painting products of various shapes with high quality.

  The present invention provides a painting sheet in a primary molding space formed by a fixed cavity mold, a primary molding core mold that advances and retreats with respect to the cavity mold, and the cavity mold and the primary molding core mold. A painting sheet supply device for fixing the painting sheet to the cavity mold, and a primary molding resin injection path for injecting a primary molding resin into the primary molding space through the painting sheet And the cavity mold and the primary molding, with the first color molded product on the front side of the two-color molded product, which is painted at the same time as molding by injection of the primary molding resin, being fixed to the cavity mold. A pressing means for pressing the first-color molded product against the cavity mold so that the core mold can be opened, a secondary molding core mold that moves forward and backward with respect to the cavity mold instead of the primary molding core mold, Color For secondary molding for molding a second-color molded product that is the back side of a two-color molded product in a secondary molding space formed by the cavity mold holding the molded product and the secondary molding core mold. A molding apparatus for two-color molded simultaneous painting products, comprising: a resin injection path for secondary molding for injecting resin.

  In the present invention, when the primary molding core mold includes an ejector pin as the pressing means, the ejector pin can be configured to advance in the cavity mold direction when the mold is opened after the first color molding.

  In the present invention, when the ejector pin forms the second color molded product by exchanging the primary molded core mold and the secondary molded core mold, the cavity pin and the secondary molded core mold are opened. It can be configured to advance when the two-color molded product is demolded later.

  In the present invention, the molding surface of the primary molding core mold is configured to mold the back surface of the first color molded product, and the molding surface of the secondary molding core mold is configured to mold the back surface of the second color molding product. be able to.

  According to the molding apparatus for the two-color molded simultaneous painting product of the present invention, the first color of the two-color molded product is molded on the product surface side, and then the second color is molded on the product back side. It has the advantage that a two-color molded simultaneous painting product can be molded with high quality without causing flow, dent scratches, or resin burrs.

  Moreover, since it is not necessary to make the cavity mold into an undercut shape, the degree of freedom of the product shape is high, and the types of products that can be molded become abundant. For example, in the product to be molded, different resins can be arranged on the left and right, such as forming the right side with a first color resin and the left side with a second color resin.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  First, a painting sheet used in the molding apparatus for two-color molded simultaneous painting products of the present invention will be described.

1 Painting sheet The painting sheet includes an insert sheet and a transfer sheet.

  The insert sheet is basically a pattern layer and adhesive layer laminated on the surface of the base sheet. After the pattern layer is bonded to the surface of the molded product via the adhesive layer, the base sheet is molded without peeling. It remains as a protective layer on the product surface.

  On the other hand, the transfer sheet basically has a release layer, a pattern layer, and an adhesive layer laminated on the surface of the base sheet. After the above pattern layer is bonded to the surface of the molded product via the adhesive layer, the base sheet is opened. It is peeled off from the interface with the release layer when or after the mold is opened.

  As the material of the base sheet, it is preferable to use PET (polyethylene terephthalate) excellent in heat resistance, but is not limited thereto, polycarbonate resin, polyamide resin, polyimide resin, polyester resin, acrylic resin, olefin resin, urethane A single layer film selected from a resin, an acrylonitrile butadiene styrene resin, a vinyl chloride resin, or the like, or a laminated film or a copolymer film of two or more resins selected from the above can be used.

  The thickness of the base sheet can be 5 to 500 μm, but it is preferable to use a sheet having a thickness of 25 to 75 μm in view of good handling properties, and 38 in view of good molding stability. It is preferable to use one having a thickness of ˜50 μm.

  The pattern layer forms characters, symbols, patterns, coating patterns, etc., and a resin binder and a pigment (or dye) are mixed, and the resin binder and a concealing metal pigment or inorganic pigment are added. It can be mixed and printed by known gravure printing.

  Note that the method of forming the pattern layer on the release layer is not limited to the gravure printing described above, and may be a method that allows the pattern layer to adhere to the release layer, for example, offset printing, screen printing, painting, dipping. Any printing method can be applied.

  Further, the pattern layer is not limited to the combination of the resin binder and the pigment as described above, but a metal film such as aluminum, chromium, copper, nickel, indium, tin, silicon oxide, etc., by a method such as vacuum deposition or plating. It can also consist of layers.

  The film thickness of the pattern layer is preferably set in the range of 0.5 μm to 50 μm in order to obtain sufficient design properties, and in the case of the above-described metal film layer, it is preferably 50 mm to 1200 mm.

  Hereinafter, a two-color molding simultaneous painting product forming apparatus using the painting sheet will be described. In the present embodiment, the transfer sheet will be described as a painting sheet.

FIG. 1 is a plan view with a partial cross section showing the configuration of a molding apparatus for two-color molding simultaneous painting article (hereinafter, abbreviated as molding apparatus) according to the present invention. It is.

  In FIG. 1, a molding apparatus 1 includes a cavity mold 2 that is a fixed side in a mold to be clamped, and a primary molding core mold 3 and a secondary molding core mold 4 that are movable.

2-1 Fixed mold The cavity mold 2 has a cavity (primary / secondary molding cavity) 5 and a cavity (secondary / primary molding cavity) 6 having the same shape arranged in the XX ′ direction. It is installed.

  For the cavity 5, one set of the first injection path 7 for primary molding and the second injection path 8 for secondary molding is provided, and the molten resin is injected into the cavity 5 from the respective injection paths. It has become.

  In addition, a set of a first injection path 9 for primary molding and a second injection path 10 for secondary molding are provided for the cavity 6, and molten resin is injected into the cavity 6 from each injection path. It is supposed to be.

  The first injection path 7 and the first injection path 9, and the second injection path 8 and the second injection path 10 are switched over by a valve gate system. However, the first injection paths 7 and 9 are the same manifold, and the second injection paths 8 and 10 are also the same manifold.

  The first injection path 7 (or first injection path 9) communicates with a primary molding injection nozzle 11 of an injection device (not shown), and the second injection path 8 (or second injection path 10) is It communicates with a secondary molding injection nozzle 12 of an injection device (not shown). The primary molding injection nozzle 11 and the secondary molding injection nozzle 12 are formed in a stationary platen 13 for fixing the cavity mold 2.

  The first injection path 7 (or first injection path 9) and the primary molding injection nozzle 11 function as a primary molding resin injection path, and the second injection path 8 (or second injection path). 10) and the secondary molding injection nozzle 12 function as a secondary molding resin injection path.

  A first painting sheet S1 is arranged corresponding to the cavity 5, and a second painting sheet S2 is arranged corresponding to the cavity 6.

  FIG. 2 shows the configuration of each painting sheet supply device that supplies the first painting sheet S1 and the second painting sheet S2. Since each painting sheet supply device for supplying a painting sheet has the same configuration, the configuration will be described as a representative of the painting sheet supply device for the first painting sheet S1.

2-2 Painting sheet supply device Fig. 2 shows the configuration of the painting sheet supply device, Fig. 2 (a) is a side view as seen from the direction of arrow A in Fig. 1, and Fig. 2 (b) is It is a front view.

  The painting sheet supply apparatus 20 intermittently supplies the first painting sheet S1 to the cavity 5, and includes a sheet supply unit 21 and a sheet winding unit 22.

  The sheet supply unit 21 winds the long first painting sheet S1 around a roll 23, and unwinds the first painting sheet S1 from one end thereof via guide rollers 24 and 25. .

  A reference numeral 26 in the sheet winding unit 22 indicates a winding roll, and the first painting sheet S1 is wound through guide rollers 27, 28, and 29.

  The first painting sheet S1 supplied from the sheet supply unit 21 is lowered by the sheet winding unit 22 in the direction of arrow B and is intermittently formed on the first painting sheet S1. The design is guided to the cavity 5.

  Further, film clamps 30 are disposed on the upper side and the lower side of the cavity 5, respectively, and the first painting sheet S 1 moved to a position facing the cavity 5 is pressed against the cavity mold 2. . While controlling the feeding of the first painting sheet, the first painting sheet S1 is accurately aligned with the cavity 5 by the fixing operation of the film clamp 30.

2-3 Movable type Returning to FIG. 1, the configuration of the movable die 3 and 4 will be described.

  The primary molding core mold 3 is provided on the rotating plate 40 so as to face the cavity 5, and the secondary molding core die 4 is arranged so as to face the cavity 6, and the rotating plate 40 is an output shaft of the drive unit 41. 42.

  When the drive unit 41 is driven and the turntable 40 is rotated by 180 ° around the central axis C, the primary molding core mold 3 is moved from the primary molding side to the secondary molding side, and the secondary molding core mold 4 is secondary. It can be moved from the molding side to the primary molding side. That is, the primary molding core mold 3 and the secondary molding core mold 4 are alternately replaced.

  The primary molded core mold 3 is fitted with a convex portion 43 that moves forward and backward with respect to the cavity 5, and when the cavity mold 2 and the primary molded core die 3 are clamped, the convex surface 43 a and the cavity A gap is formed between the surface 5a, and this gap becomes a primary molding space for molding the first color of the two-color molded product.

  In the primary molding in the primary molding space, painting is performed simultaneously with molding using the first painting sheet S1.

  When performing the primary molding, the first painting sheet S1 is adsorbed on the cavity surface 5a, and the first painting sheet S1 is used for the primary molding from the first injection path 7 on the opposite side to the painting side of the adsorbed first painting sheet S1. Filled with resin.

  Further, two ejector pins 44 are provided through the convex portion 43 in the YY ′ direction, and the base end portions of these ejector pins 44 are fixed to the ejector plate 45.

  Therefore, when the ejector plate 45 reciprocates in the direction of the arrow YY ′, the ejector pin 44 protrudes from the convex surface 43 a or is stored in the convex 43.

  However, the ejector pin 44 in the molding apparatus 1 of the present invention projects from the convex portion 43 when the mold is opened after the primary molding, in addition to the conventional function of projecting and releasing the molded product attached to the convex portion 43. The molded first-color molded product functions as a pressing means for pressing the cavity mold 2 against the cavity 5 side.

  As a result, the cavity mold 2 and the primary molding core remain fixed to the cavity mold 2 while the first color molded article on the front side of the two-color molded article, which is painted at the same time as molding by injection of the primary molding resin, is fixed. The mold 3 can be opened.

  Since the first color molded product remaining on the cavity mold 2 side is integrated with the first painting sheet S1, the molding apparatus 1 of the present invention uses the first painting sheet S1 after the primary molding. By holding the film clamp 30, the first-color molded product can be held by the cavity mold 2.

  On the other hand, a convex portion 46 that advances and retreats with respect to the cavity 6 is attached to the secondary molding core die 4 as a nest. Note that the size of the convex portion 46 is slightly smaller than that of the convex portion 43.

  When the cavity mold 2 and the secondary molding core mold 4 are clamped, a gap is formed between the convex surface 46a and the back surface of the first color molded product molded in the previous step (not shown). This is a secondary molding space for molding the second color of the color molded product.

  Further, the ejector pin 47 is provided with two ejector pins 47 so as to be able to penetrate the projecting portion 46, and the ejector pin 47 is connected to an ejector plate 48 that reciprocates in the direction of the arrow Y-Y '. . Note that the ejector pin 47 has only a conventional function of protruding and removing the molded product attached to the convex portion 46.

  Next, a method for forming a two-color molded simultaneous painting product by the molding apparatus 1 will be described.

3 Forming method of two-color molding simultaneous painting product FIGS. 3 to 13 show each step of the molding method.

3-1 Mold clamping start Figure 3 shows the mold clamping start.

  In the following description, the lower side from the center line C is referred to as the operation side, and the upper side is referred to as the counter-operation side, and each step will be described with reference to the operation side and the counter-operation side as a reference. In the present embodiment, a case where a transfer sheet is used as the first painting sheet S1 will be described.

  First, the first painting sheet S1 is supplied from the painting sheet supply device 20, and a predetermined pattern formed on the sheet surface is positioned at a position facing the cavity 5 of the cavity mold 2, and the first position is determined. One painting sheet S1 is brought into close contact with the cavity surface 5a.

  In addition, the shaping | molding apparatus 1 of this embodiment is comprised so that 2 color shaping | molding can be performed by both the operation side and the non-operation side. Therefore, the first-color molded product R1 ′ shown on the counter-operation side is formed in the previous step, that is, when the primary molding movable mold 3 is moved to the counter-operation side.

3-2 Completion of Clamping Next, as shown in FIG. 4, the cavity mold 2, the primary molding core mold 3, and the secondary molding core mold 4 are clamped.

  At this time, a gap is formed between the cavity surface 5a of the cavity mold 2 and the convex surface 43a of the primary molding core mold 3, and this gap becomes the primary molding space D1.

3-3 Primary Molding Next, as shown in FIG. 5, the primary molding resin R <b> 1 is filled into the primary molding space D <b> 1 through the first injection path 7.

  At this time, the valve pin of the first injection path 7 is “open”, the second injection path 8 is “closed”, the first injection path 9 is “closed”, and the second injection path 10 is “open”.

  In this way, the pattern of the painting sheet S1 is bonded to the first-color molded product R1 ′ simultaneously with the primary molding.

  The term “adhesion” as used herein means that the primary molding resin R1 is cooled and solidified in contact with the adhesive layer of the first painting sheet S1, and the first color molded product R1 ′ is molded and the first color molded product. It means that the pattern is joined to R1 ′ and integrated.

  As described above, since the first-color molded product R1 ′ molded in advance is mounted on the cavity mold 2 on the counter-operation side, secondary molding is performed by filling the molten resin R2 on the counter-operation side. It is.

  In the following description, a molded product obtained by curing the primary molding resin R1 is referred to as a first-color molded product R1 ′, and a molded product obtained by curing the secondary molding resin R2 is referred to as a molded product obtained by curing the secondary molding resin R2. This is called a second color molded product R2 ′.

3-4 Beginning of mold opening As shown in FIG. 6, the film mold 30 (see FIG. 2) is in an operating state, that is, with the first painting sheet S1 fixed, the cavity mold 2 and the primary molding core molds 3, 2 The mold opening of the next molding core mold 4 is started.

  At this time, by moving the ejector plate 45 on the operation side in the E direction, the ejector pins 44 are instantaneously protruded from the convex surface 43a, and the molded first color molded product R1 ′ is pressed against the cavity mold 2. As a result, the first-color molded product R1 ′ adhered to the first painting sheet S1 is held by the cavity mold 2.

  On the other hand, on the non-operation side, the ejector pin 47 does not operate, and the two-color molded product R in which the first-color molded product R1 ′ and the second-color molded product R2 ′ are joined and integrated is released from the cavity mold 2.

3-5 Completion of Mold Opening As shown in FIG. 7, when the mold opening is completed, the first color molded product R1 ′ remains in the cavity mold 2 on the operation side, and the ejector pin 44 is stored in the convex portion 43. On the other hand, the two-color molded product R remains in the secondary molding core mold 4 on the non-operation side.

3-6 Protrusion of two-color molded product As shown in FIG. 8, by projecting the ejector pin 47 on the counter-operation side from the convex portion 46, the two-color molded product R molded on the counter-operation side is secondary It removes from the shaping | molding core type | mold 4, and prepares for replacement | exchange of the primary shaping | molding core type | mold 3 and the secondary shaping | molding core type | mold 4 of a next process.

3-7 Rotation of the movable mold Next, as shown in FIG. 9, by driving the drive unit 41 (see FIG. 1), the rotating disk 40 is rotated around the central axis C, and the primary molded core mold 3 and The secondary molding core mold 4 is replaced.

  However, the first-color molded product R 1 ′ molded by the primary molding core mold 3 and the cavity mold 2 is held by the cavity mold 2.

3-8 Clamping Next, as shown in FIG. 10, the primary molding core mold 3 and the secondary molding core mold 4 are clamped to the cavity mold 2.

  Accordingly, a secondary molding space D2 is formed between the back surface of the first-color molded product R1 ′ on the operation side and the convex portion 46 of the secondary molding core mold 4.

3-9 Secondary Molding Next, as shown in FIG. 11, secondary molding resin R2 is filled into secondary molding space D2 through second injection path 8.

  At this time, the valve pin of the first injection path 7 is “closed”, the second injection path 8 is “open”, the first injection path 9 is “open”, and the second injection path 10 is “closed”.

3-10 Mold Opening Next, as shown in FIG. 12, the cavity mold 2, the primary molded core mold 3, and the secondary molded core mold 4 are opened.

  On the operation side, the two-color molded product R molded in two colors is released from the cavity mold 2 by performing mold opening without causing the ejector pin 47 to protrude from the convex portion 46.

  On the other hand, on the counter-operation side, the first color molded product R1 ′ is pressed against the cavity mold 2 by causing the ejector pin 44 to protrude from the convex portion 43 instantaneously. At this time, since the film clamp 30 that presses the second painting sheet S2 against the cavity mold 2 continues the sheet fixing operation, the first-color molded product R1 ′ is held on the cavity mold 2 side.

3-11 Extrusion of Molded Product As shown in FIG. 13, the two-color molded product R molded on the operation side is removed from the secondary molding core die 4 by causing the ejector pin 47 to protrude from the convex portion 46 on the operation side.

  If molding is performed according to the above-described steps, after the first color molded product corresponding to the front side of the molded product is molded, the second color molded product corresponding to the back side of the molded product is molded, joined, and integrated. A two-color molded product R that does not cause molding defects such as sink marks, resin flow, scratches, and resin burrs can be formed on the product appearance.

4 Two-color molded simultaneous painting article FIGS. 14A to 14D are perspective views illustrating a planar two-color molded article that can be molded by the molding apparatus 1. The front side of the color molded product is shown on the right side and the back side thereof.

  First, the two-color molded product 50 shown in FIG. 14A is a back-side plate (second-color molded product) in which a surface-side plate (first-color molded product) 50a is primarily molded with a transparent resin and is partially cut away. ) 50b is secondarily molded with a colored resin, and both are joined and integrated.

  The two-color molded product 51 shown in FIG. 14B is a back-side plate (second-color molded product) 51b that is obtained by first molding a surface side plate (first-color molded product) 51a with a transparent resin and partially cutting it. Is formed by integrally molding the resin with a colored resin, and a window 51c is formed on the back plate 51b.

  The window 51c has a mold convex portion corresponding to the window in contact with the back surface of the front side plate 51a formed by primary molding, and fills the surrounding gap with resin (secondary molding). Can be provided.

  The two-color molded product 52 shown in FIG. 14 (c) is a back-side plate (second-color molded product) 52b that is formed by first molding a front side plate (first-color molded product) 52a with a transparent resin. Is formed with a colored resin, and both are joined and integrated. A part of the back plate 52b is a grid-like rim 52c to form a partition for operation buttons.

  The two-color molded product 53 shown in FIG. 14 (d) is obtained by first molding one plate (first-color molded product) 53a obtained by dividing the surface side plate into two in the width direction, using the transparent resin, and the other plate (second-color molded product) Product) 53b and the rear side plate (second color molded product) 53c shown in a partially cut-out form, each of which is simultaneously secondary molded with a colored resin and integrated.

  Each of the two-color molded products 50, 51, 52, and 53 molded in a planar manner can be applied to, for example, a display panel and an operation panel of a mobile phone, a front panel of an AV device or a home appliance, an automobile instrument panel, or the like. it can.

  15 (a) to 15 (d) are perspective views illustrating a three-dimensional two-color molded product that can be molded by the molding apparatus 1. In each drawing, the left side is the front side of the two-color molded product. The right side shows the back side.

  First, in the two-color molded product 54 shown in FIG. 15A, the surface side plate (first-color molded product) 54a is primarily molded with a transparent resin in the same manner as the two-color molded product 50 shown in FIG. 14A. The back side plate (second color molded product) 54b shown in a partially cut-out is secondarily molded with a colored resin, and both are joined and integrated. Unlike the product 50, it is molded in three dimensions.

  Specifically, a skirt portion 54c is integrally formed on the outer peripheral portion of the surface side plate 54a, and a skirt portion 54d is similarly formed on the back side plate 54b.

  The two-color molded product 55 shown in FIG. 15 (b) is primarily molded with a transparent resin on the surface side plate (first color molded product) 55a, similarly to the two-color molded product 51 shown in FIG. 14 (b). The back side plate (second color molded product) 55b shown with a part cut away is secondarily molded with a colored resin, and a window portion 55c is further formed on the back side plate 55b.

  Also for the two-color molded product 55, the front side plate 55a has a skirt portion 55d, and the back side plate 55b has a skirt portion 55e, and has a three-dimensional shape.

  The two-color molded product 56 shown in FIG. 15 (c) is primarily molded with a transparent resin on the surface side plate (first color molded product) 56a in the same manner as the two-color molded product 52 shown in FIG. 14 (c). The rear side plate (second color molded product) 56b shown in a partially cut-out is secondarily molded with a colored resin and integrated, and further, a part of the rear side plate 56b is molded into a grid-like rim 56c. By doing so, a partition for the operation button is formed.

  Also for the two-color molded product 56, the front side plate 56a has a skirt portion 56d, and the back side plate 56b has a skirt portion 56e, and has a three-dimensional shape.

  The two-color molded product 57 shown in FIG. 15 (d) is one plate (first-color molded product) obtained by dividing the surface side plate into two in the width direction, similarly to the two-color molded product 53 shown in FIG. 14 (d). 57a is first molded with a transparent resin, and the other side (second color molded product) 57b and a partially cut back side plate (second color molded product) 57c are secondarily molded simultaneously with colored resin and integrated. It is a thing.

  Also in the two-color molded product 57, one plate 57a has a skirt portion 57d, and the back side plate 57c has a skirt portion 57e, and has a three-dimensional shape.

  As shown in FIGS. 15A to 15D, the two-color molded products 54, 55, 56, and 57 molded three-dimensionally can be applied to, for example, a casing of a mobile phone.

  In the present embodiment, a transparent resin such as polymetamethyl acrylate and polycarbonate can be used as the primary molding resin, and a colored resin such as ABS resin and polycarbonate can be used as the secondary molding resin. Although it can be used, the primary molding resin may be colored, and the secondary molding resin may be transparent.

  Furthermore, the primary molding resin and the secondary molding resin may be made of the same resin.

  In addition, although the pattern layer of the painting sheet is added to the surface side plate of each two-color molded product shown in FIGS. 14 and 15 by transfer, the pattern layer is a part of the surface side plate. Alternatively, it may be transferred as a whole coating pattern, or may be transferred as a designed pattern or character.

  Next, a painting method using the characteristics of the molding apparatus of the present invention will be described with reference to FIG.

  The figure shows a state in which the mold is opened after the secondary molding. The first painting sheet S1 is adsorbed in the cavity 5 of the cavity mold 2. The pattern Sa of the first painting sheet S1 is 2 It is transferred to the surface of the color molded product R.

  As shown in the figure, when forming the two-color molded product R without overlapping the end G of the second-color molded product R2 ′ with the first-color molded product R1 ′, If another picture Sb is printed at a position corresponding to G, the other picture Sb can be transferred to the end G.

  That is, the pattern Sa printed on the first painting sheet S1 and another pattern Sb can be distributed and transferred to the first color molded product and the second color molded product. Such a transfer method is suitable, for example, when a case of a mobile phone in which one of the transfer forms a window portion related to the liquid crystal panel and the other forms a design picture is molded with a two-color molded product. .

  In addition, the primary molded core mold and the secondary molded core mold of the present invention have been described by taking the configuration in which the first molded core mold and the secondary molded core mold are switched by rotation as an example. However, the present invention is not limited to this. When it has, the state which this slide core slid can also be made into a movable secondary shaping | molding core type | mold.

It is a top view which has a partial cross section which shows the structure of the shaping | molding apparatus based on this invention. (a) is a side view showing the configuration of a painting sheet supply device for supplying the painting sheet of FIG. 1, and (b) is a front view thereof. It is a top view which shows the clamping start process of the shaping | molding method which concerns on this invention. It is a top view which shows the mold clamping completion process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the primary shaping | molding process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the mold opening start process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the mold opening completion process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the molded article ejection process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the movable mold replacement | exchange process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the clamping process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the secondary shaping | molding process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the mold opening process of the shaping | molding method by the shaping | molding apparatus of this invention. It is a top view which shows the molded article ejection process of the shaping | molding method by the shaping | molding apparatus of this invention. (a)-(d) is a perspective view which shows the two-color molded product which can be shape | molded with the shaping | molding method by the shaping | molding apparatus of this invention. (a)-(d) is a perspective view which shows another two-color molded product which can be shape | molded with the shaping | molding method by the shaping | molding apparatus of this invention. It is explanatory drawing which shows the painting method using the characteristic of the shaping | molding method by the shaping | molding apparatus of this invention. It is process drawing explaining the conventional 2 color shaping | molding simultaneous painting method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Cavity mold 3 Primary molding core mold 4 Secondary molding core mold 5, 6 Cavity 7 First injection path 8 Second injection path 9 First injection path 10 Second injection path 11 Injection nozzle 12 for primary molding Secondary forming injection nozzle 13 Fixed plate 20 Painting sheet supply device 21 Sheet supply unit 22 Sheet take-up unit 23 Roll 24, 25 Guide roller 26 Take-up rolls 27-29 Guide roller 30 Film clamp 40 Rotary plate 41 Drive unit 42 Output shaft 43 Convex part 43a Convex part surface 44 Ejector pin 45 Ejector plate 46 Convex part 47 Ejector pin 48 Ejector plate D1 Primary molding space part D2 Secondary molding space part S1 First painting sheet S2 Second painting sheet R1 1 Secondary molding resin R2 Secondary molding resin R1 '1st color molded product R2' 2nd color molded product R 2nd color molded product

Claims (4)

A fixed cavity mold,
A primary molding core mold that advances and retreats with respect to the cavity mold;
A painting sheet supply device for supplying a painting sheet to a primary molding space formed by the cavity mold and the primary molding core mold and fixing the painting sheet to the cavity mold;
A primary molding resin injection path for injecting a primary molding resin into the primary molding space through the painting sheet;
The cavity mold and the primary molding core mold are fixed to the cavity mold while the first color molded article on the front side of the two-color molded article, which is painted simultaneously with molding by injection of the primary molding resin, is fixed. Pressing means for advancing in the cavity mold direction from the primary molding core mold when the mold is opened after the first color molding, and pressing the first color molded product against the cavity mold;
A secondary molded core mold that advances and retreats with respect to the cavity mold instead of the primary molded core mold;
2 for forming a second-color molded product on the back side of the two-color molded product in a secondary molding space formed by the cavity mold holding the first-color molded product and the secondary molded core mold. A secondary molding resin injection path for injecting a secondary molding resin;
An apparatus for forming a two-color molded simultaneous painting article, comprising:   2. The two-color molding according to claim 1, wherein an ejector pin is provided in the primary molding core mold as the pressing means, and the ejector pin is configured to advance toward the cavity mold when the mold is opened after the first-color molding. Simultaneous painting equipment molding equipment. The secondary molding core mold further includes an ejector pin , and the ejector pin replaces the primary molding core mold and the secondary molding core mold to form the second color molded product. 3. The molding apparatus for two-color molded simultaneous painting product according to claim 1 or 2, wherein the molding device is configured to advance when the two-color molded product is removed after the secondary molding core mold is opened.   The molding surface of the primary molding core mold is configured to mold the back surface of the first color molded product, and the molding surface of the secondary molding core mold is configured to mold the back surface of the second color molded product. The molding apparatus for the two-color molded simultaneous painting article according to any one of 1 to 3.

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