JP4160147B2 - Manufacturing method of plastic parts for gaming machines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plastic part of a gaming machine to be mounted on a gaming machine typified by a ball game machine such as a pachinko machine or an arrangement ball type pachinko machine, or a revolving type gaming machine such as a slot machine, and a manufacturing method thereof. .
[0002]
[Background Art and Problems to be Solved by the Invention]
As shown in FIG. 8, in a ball game machine 100 such as a pachinko machine, for example, an upper lamp decoration 102, a side lamp decoration 104, etc. are provided as plastic parts covering the lamps. Although not shown, corner decorations for covering lamps attached to the game board, lamp decorations for winning devices, and the like are also used. Note that light bulbs and LEDs are used as the lamps.
[0003]
Plastic parts for covering the light source such as these lamps, for example, the upper lamp decoration 102 are colored translucent translucent portions 106, 108, 110 corresponding to lamps (not shown) arranged on the back surface, and these translucent translucent parts. It was comprised from the board | substrate part 112 etc. which hold | maintain the parts 106-110. Specifically, the upper lamp decoration 102 is formed by separately molding and bonding the light transmitting portions 106 to 110 and the substrate portion 112. This is because the light-transmitting portions 106 to 110 and the substrate portion 112 have different colors or the light-transmitting portions 106 to 110 need to be different colors, and thus the respective parts are individually molded. Therefore, in the case of the upper lamp decoration 102, even if the light transmitting part 106 and the light transmitting part 110 are formed with a common mold, three molds are required, and a single upper lamp decoration 102 is produced. Four molding operations were required. Such a situation is also the same for, for example, multicolor plastic parts, plastic parts having some different materials, and the like.
[0004]
Also, in a gaming machine having a different form from a ball game machine such as a slot machine, various plastic parts are used, and the manufacturing procedure is the same as that of a ball game machine.
That is, in the manufacture of plastic parts of conventional gaming machines, a plurality of molding dies and a plurality of molding operations are required for each plastic part, and an operation for bonding the molded parts into one part is also required. Many things were needed.
[0005]
Moreover, because of this manufacturing procedure, when trying to create complex color combinations and patterns, the shape of each part becomes complex and the number of parts increases, making it difficult to manufacture and high cost. . For this reason, it has been difficult to adopt plastic parts having complicated color combinations and complicated patterns.
[0006]
An object of the present invention is to reduce the types of molds used when manufacturing plastic parts for gaming machines and to simplify the manufacturing process. Secondly, it is intended to increase the degree of freedom in the combination of colors and patterns in plastic parts, the degree of freedom of uneven portions (three-dimensional shape), that is, the degree of freedom in design.
[0007]
[Means for Solving the Problems and Effects of the Invention]
  A manufacturing method of a plastic part of a gaming machine according to claim 1 for solving the above-mentioned problem,Having a colored portion containing a printed circuit printed with ink containing mica having a metal filmInsert the film into the mold and inject the plasticized plastic into the mold and transfer the colored part from the film to the plastic side, or integrate the film with the plastic It is characterized by doing.
[0008]
  In carrying out the method of the present invention, a film colored in advance according to the pattern of a plastic part is prepared. Coloring can be performed by, for example, printing, painting, plating, vapor deposition, or the like.However, the colored portion includes a wiring circuit printed using ink containing mica having a metal film.
  In the case of plastic parts that are required to be partially translucent, such as lamp decorations, the plastic becomes translucent and becomes the front of the lamps when they are commercialized. The portion corresponding to the portion may be colored using translucent ink, for example, the periphery thereof may be colored with non-translucent ink.
[0009]
Further, for example, overprinting can be performed. For example, a complicated pattern can be created by overprinting two colors and three colors with different shapes for each color. Alternatively, colors can be synthesized by overlapping a plurality of inks. For example, when silver (opaque) and translucent yellow are overlapped, a gold color can be obtained, so that the cost can be made much lower than when gold ink is used.
[0010]
  thisThe colored film is inserted into a mold corresponding to the shape of the plastic part and clamped, and the plasticized plastic is injected into the mold (cavity). Then, the colored portion (for example, ink) is transferred from the film to the plastic side by the heat and pressure of the injected plastic. This ink does not fall off the surface of the plastic even when the plastic cools and solidifies. Therefore, a transfer image such as a pattern colored on the film is formed on the surface of the plastic (plastic part), and the plastic part can be colored.
[0011]
Alternatively, the film may be integrated with plastic during injection molding. Even in this case, the plastic part can be colored.
Since the plastic part is manufactured in this way, it is not necessary to mold it separately into, for example, a translucent part and other parts, or to mold each part having a different color. Accordingly, one mold and one molding operation are sufficient for each plastic part, and an operation for bonding a plurality of parts to one part after molding is not necessary. Accordingly, the number of molds is small and the manufacturing process is simplified.
[0012]
  In addition, any color combination and any pattern need only be able to be colored on the film, and the restrictions on the color combination and pattern are virtually eliminated, and the degree of freedom in design is dramatically increased.
  And with or instead of decorative patterns,Printing using ink containing mica with metal coatingTo provide an electrical circuit for plastic partsSoSince an electric wire and a wiring board are not required, the number of parts related to the wiring of the gaming machine is reduced and the structure is simplified.
[0014]
  Mica with a metal filmFor example, it is disclosed in Japanese Patent Publication No. 60-33133.ing. Print using ink containing this micaTo obtain conductivity byCan do.In the case of printing by this mica or the like, flake-like mica overlaps each other to form a conductive layer, so that even if the film is deformed, it is difficult to disconnect.
[0015]
  The method for manufacturing a plastic part for a gaming machine according to claim 2 is the method for manufacturing a plastic part for a gaming machine according to claim 1,The plastic part is a plastic part that covers or incorporates lamps, and the wiring circuit is a wiring circuit for supplying power to the lamps.It is characterized by that.
  Since the wiring circuit for supplying power to the lamps is provided on the plastic parts, the number of parts related to the wiring is reduced and the structure is simplified in the plastic parts that cover the lamps or incorporate the lamps. .
  The method for manufacturing a plastic part for a gaming machine according to claim 3 is the method for manufacturing a plastic part for a gaming machine according to claim 2, wherein the plastic is translucent and is placed on the front surface of the lamps of the film. The colored portion is colored using a translucent ink, and is suitable for manufacturing a plastic part having a lens portion for covering lamps such as a lamp decoration. .
[0016]
  The method for manufacturing a plastic part for a gaming machine according to claim 4 is the method for manufacturing a plastic part for a gaming machine according to any one of claims 1 to 3, wherein an insulating material is used on the lower wiring circuit. The wiring circuit is multilayered by covering and providing another wiring circuit thereon.
[0017]
  Claim 5The manufacturing method of the plastic parts of the described gaming machine,When manufacturing a plastic part of a gaming machine, after inserting a film having a colored portion containing a wiring circuit printed using ink containing mica having a metal film into the mold, the inside of the mold Pressurize with gas, and in the mold that is pressurizedPlasticized plastic composition with foamabilityThe colored portion is transferred from the film to the plastic composition side, or the film is integrated with the plastic composition,The pressure by the gas is released after the surface layer portion of the plastic composition filling the mold is solidified.
[0018]
  thisClaim 5The molding method employed in is known as the counter pressure molding method. The advantage of the counter pressure molding method is that it can prevent sinking of thick molded products.
  The plastic or plastic composition injected into the mold is solidified by being cooled in the mold. At this time, the surface side is solidified first, and the interior is solidified with a delay. Then, surface defects called sinks may occur due to shrinkage accompanying internal solidification. Generally, sink marks are likely to occur when the thickness of the molded product exceeds 4 mm.
[0019]
In the counter pressure molding method, a plasticized plastic composition is injected into a mold that is pressurized with gas, so that the plastic composition injected into the mold immediately foams. There is no. The injected plastic composition fills the inside of the mold and starts to solidify from the surface layer portion. However, since the inside of the mold is in a pressurized state until the solidification of the surface layer portion is completed, foaming does not occur at this point. Then, when the pressure by the gas is released before the surface layer portion is solidified and the inside is solidified, foaming occurs inside the plastic composition so as to compensate for the shrinkage accompanying the solidification inside. That is, since the shrinkage due to solidification is canceled out by the expansion due to foaming, sink marks do not occur. In addition, since the surface layer part is solidified before foaming, unevenness does not occur due to foaming, and the surface of the molded product is smooth.
[0020]
By adopting this counter pressure molding method, it is possible to mold thick parts such as a frame of a ball game machine.
Since the inside of the molded product becomes clouded due to foaming, the foamed portion is not suitable for a portion (lens portion) that covers lamps, for example.
[0021]
However, for a portion such as a lens portion where it is desired to avoid foaming, the thickness of the portion may be reduced. If so, foaming hardly occurs because the amount of shrinkage accompanying solidification is small. Further, since the time required from the solidification of the surface layer to the solidification of the inside is shortened, the solidification of the inside also proceeds when the pressure in the mold is released, and this can also suppress the foaming.
[0022]
A plastic composition having foaming properties is obtained by mixing a foaming agent into plastics, and various types are known. Examples of the plastic include ABS and polystyrene, and examples of the foaming agent include organic foaming agents that generate nitrogen gas, and inorganic foaming agents such as sodium bicarbonate and ammonium carbonate. These are merely examples and are not limited to these. The plastic itself may be colored or colorless (transparent). However, when a portion requiring light transmissivity such as the lens portion described above is provided, it is necessary to use colorless (transparent) or highly transparent one.
[0023]
  And these claims1 to 5By any of the manufacturing methods described inGame machinePlastic partsManufactureAs a result, it is possible to reduce the manufacturing process and cost of the gaming machine, and to entertain the player due to the variety of designs.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be specifically described with reference to the drawings.
[0025]
[Example 1]
First, the structure of an injection molding machine used when carrying out the manufacturing method of the present invention will be described with reference to FIG. The injection molding machine 10 is held by an injection device 16 including a heating cylinder 12 for plasticizing a raw material plastic and a nozzle 14 for injecting the plasticized plastic, a fixed plate 18 with a fixed relative position, and a fixed plate 18. A fixed mold 20, a movable mold 22 that forms a mold together with the fixed mold 20, a movable plate 24 that holds the movable mold 22, a ram 26 to which the movable plate 24 is connected, and a ram 26 It comprises a mold closing device 28 that drives back and forth, a supply roller 32 around which the film 30 is wound, a take-up roller 34 that winds up the film 30 from the supply roller 32, and the like.
[0026]
The fixed mold 20 and the movable mold 22 are provided with recesses 36a and 36b that form cavities corresponding to the outer shape of the molded product when they are joined. The fixed mold 20 and the fixed platen 18 are provided with an injection hole 38 communicating with the recess 36a. When the injection device 16 is advanced to join the nozzle 14 to the fixed platen 18, the nozzle 14 and the injection hole 38 are provided. Is a series.
[0027]
When the ram 26 is pushed out by the mold closing device 28, the movable mold 22 is moved together with the movable platen 24 toward the fixed mold 20, and both the film 30 is sandwiched between the movable mold 22 and the fixed mold 20. The molds 22 and 20 can be joined to close the mold. When the mold is closed, a cavity is formed by the recesses 36a and 36b, and the film 30 is inserted so as to cross the cavity.
[0028]
On the other hand, a plurality of patterns as shown in FIG. 2, for example, are printed on the surface of the film 30 on the fixed mold 20 side along the longitudinal direction of the film 30. This pattern is a mirror image of the pattern of the corner decoration 60 shown in FIG. A cross-sectional shape of the film 30 is schematically shown in FIG. First, a transparent red layer 42 and a transparent orange layer 44, each of which is semi-circular and forming a circle, are formed on a polyester film 40 as a base layer, an opaque red layer 46 surrounding the circle, a belt-like silver layer 48, and a transparent red layer. Except for the layer 42 and the transparent orange layer 44, an opaque green layer 50 is printed that covers almost the entire area of a substantially triangular region including the opaque red layer 46 and the silver layer 48.
[0029]
In order to form the corner decoration 60 using the film 30, the fixed mold 20 and the movable mold 22 having the recesses 36 a and 36 b corresponding to the shape of the corner decoration 60 are attached to the injection molding machine 10. The pattern of the corner decoration printed on is correctly matched with the recesses 36a and 36b, and the movable mold 22 is joined to the fixed mold 20 to close the mold.
[0030]
In this state, the injection device 16 is advanced to join the nozzle 14 to the stationary platen 18 and the molten plastic is injected from the nozzle 14. The injected plastic enters the cavity through the injection hole 38 and fills the cavity. The film 30 is pressed against the concave portion 36b of the movable mold 22 by the pressure of the plastic, and is deformed along the shape. The plastic gradually cools and solidifies in the cavity. At this time, the ink printed on the film 30 is transferred to the plastic side by the heat of the plastic. After the plastic is completely solidified, the movable mold 22 is moved away from the fixed mold 20 and the mold is opened to take out the product (in this case, the corner decoration 60).
[0031]
The corner decoration 60 is used as an decoration that covers the upper corner of the game board 64 of the pachinko machine 62, as shown in FIG. Lamps (not shown) are respectively installed behind the semicircular portions 66a and 66b colored by the transparent red layer 42 and the transparent orange layer 44 shown in FIGS. Further, the corner ornament 68, the lower corner ornaments 70a and 70b, the upper lamp ornament 72 installed on the upper portion, etc. are formed by the same method, and the round portion of the corner ornament 68 is formed. 68a and the lamp windows 72a, 72b, 72c of the upper lamp decoration 72 are all colored and translucent.
[0032]
Thus, a plastic part (in this example, the corner decoration 60) having a colored and translucent part can be manufactured by a single injection molding, and thus, for example, the translucent part and the other part. There is no need to mold the parts separately or to form parts with different colors. Accordingly, one mold and one molding operation are sufficient for each plastic part, and an operation for bonding a plurality of parts to one part after molding is not necessary. Accordingly, the number of molds is small and the manufacturing process is simplified.
[0033]
In addition, any color combination and any pattern need only be able to be colored on the film, and the restrictions on the color combination and pattern are virtually eliminated, and the degree of freedom in design is dramatically increased.
And by adopting the plastic parts of the gaming machine manufactured by this manufacturing method, it is possible to reduce the process and cost in the manufacturing side of the gaming machine, and entertain the player by the diversity of design be able to.
[0034]
[Example 2]
Next, Example 2 which employ | adopted the counter pressure molding method is demonstrated.
The structure of the injection molding machine 80 used in the second embodiment is as shown in FIG. 5 and is substantially the same structure as the injection molding machine 10 used in the first embodiment. Are given the same product numbers as in FIG.
[0035]
As with the injection molding machine 10 of the first embodiment, the injection molding machine 80 includes an injection device 16 including a heating cylinder 12 and a nozzle 14, a fixed plate 18, a fixed mold 20a, a movable mold 22, a movable plate 24, A ram 26, a mold closing device 28, a supply roller 32, a take-up roller 34, and the like are included. The fixed mold 20a and the movable mold 22 are provided with recesses 36a and 36b that form cavities. The shape of the cavities is different from that of the first embodiment.
[0036]
The stationary mold 20a is provided with a supply / exhaust port 82 communicated with the recess 36a through a fine gas passage through which gas passes but plasticized plastic cannot pass. 84 is connected. A gas cylinder or a compressor and an exhaust valve (not shown) are connected to the hose 84, so that pressurized gas from the gas cylinder or pressurized air from the compressor can be supplied into the cavity. Can be released.
[0037]
Now, the structure of the window frame 91 of the pachinko machine molded by the counter pressure molding method by the injection molding machine 80 is as shown in FIG. 6 shows a front frame 90 of a pachinko machine, a window frame 91 attached to the pachinko machine, an upper tray 92, a lower tray 93, an ashtray 94, and the like, and the internal structure of the launch handle, the body frame, the game board, etc. Is not shown.
[0038]
The window frame 91 is provided with a circular window 95, and the game board can be viewed through a glass plate (not shown) held on the back side of the window frame 91.
The window frame 91 is made of transparent lenses such as lens portions 97a, 97b, 97c, 97d, and 97e disposed above the window 95, and small windows 99a, 99b, 99c, and 99d disposed on the lower left and right sides of the window 95. It has a light part. The lens portions 97a to 97e blink according to the state of the game (for example, at the time of a big hit), or when the state of the pachinko machine (for example, when there are not enough game balls for prize balls, the game balls cannot be normally launched) Etc.) to cover a lamp (not shown) that is turned on for reporting. The small windows 99a to 99d are for decoration, and one of them (the small window 99d) is transparent so as to face the stamp attached to the lower right corner of the game board.
[0039]
Next, injection molding for molding this window frame 91 will be described.
Prior to injection molding, the portions other than the light-transmissive printing portions printed with light-transmissive ink corresponding to the lens portions 97a to 97e and the small windows 99a to 99c, and the lens portions 97a to 97e and the small windows 99a to 99d. A film 30 (a film 30 itself is transparent) on which a window frame pattern including an opaque printing portion printed with an opaque ink is printed corresponding to the pattern to be applied is prepared. The fixed mold 20 and the movable mold 22 having the recesses 36 a and 36 b corresponding to the shape of the body 91 are attached to the injection molding machine 10. The lens portions 97a to 97e and the small windows 99a to 99d have a thickness of about 3 mm, and the concave portions 36a and 36b have shapes corresponding thereto.
[0040]
Next, the pattern of the window frame printed on the film 30 is made to correspond correctly to the recesses 36a and 36b, the movable mold 22 is joined to the fixed mold 20, the mold is closed, and the injection device 16 is advanced to advance the nozzle. 14 is joined to the stationary platen 18 to seal the cavity, and then the pressurized gas is supplied from the air supply / exhaust port 82 to pressurize the cavity.
[0041]
In this state, the molten plastic is injected from the nozzle 14 of the injection device 16. This plastic (strictly speaking, a plastic composition) is a mixture of a transparent plastic and an organic foaming agent, and does not foam when pressurized to a set value or higher, but foams under a lower pressure. For this reason, the inside of the injection device 16 is set to a pressure at which the plastic does not foam.
[0042]
The plastic injected from the nozzle 14 enters the cavity through the injection hole 38 and fills the cavity. However, since the pressure of the pressurized gas acts, the plastic does not foam at this stage. Further, the film 30 is pressed against the concave portion 36b of the movable mold 22 by the pressure of the pressurized gas, but is further pressed against the concave portion 36b by the pressure of the plastic, and deforms along its shape. At this time, the film 30 is bonded to the plastic by the heat of the plastic.
[0043]
The plastic gradually cools and solidifies in the cavity. At the timing when the surface layer of the plastic is solidified (this timing is set in advance by experiments or the like), the air supply / exhaust port 82 is opened to the atmosphere and the pressure in the cavity is increased. Is released. Then, foaming occurs inside the plastic so as to compensate for the shrinkage accompanying the solidification of the plastic. That is, since the shrinkage due to solidification is canceled out by the expansion due to foaming, sink marks do not occur.
[0044]
In addition, since the surface layer part is solidified before foaming, unevenness does not occur due to foaming, and the surface of the molded product is smooth. The lens portions 97a to 97e and the small windows 99a to 99d are transparent because they are not foamed because they are set to be thin.
Since the film 30 is adhered to the surface of the window frame 91 as a molded product as described above, the lens portions 97a to 97e and the small windows 99a to 99c are translucent printing printed with translucent ink. The small window 99d is covered with a transparent portion of the film 30, and the other portions are covered with an opaque printing portion. After the plastic is completely solidified, the movable mold 22 is separated from the fixed mold 20 and the mold is opened to take out the product.
[0045]
Thus, by adopting the counter pressure molding method, a thick part such as the window frame 91 can be molded. Further, by performing in-mold molding at that time, a component having a complicated color arrangement such as a complicated pattern such as the window frame 91 or a transparent portion, a translucent portion, an opaque portion or the like can be obtained. It can be molded by a single molding operation. In addition, the pattern applied to the window frame 91 can be changed simply by changing the pattern to be printed on the film 30, etc., so the degree of freedom in color combinations and patterns in parts and the degree of unevenness (three-dimensional shape) Etc., that is, the degree of freedom in design increases.
[0046]
In this embodiment, the film 30 is integrated with the window frame 91, but may be transferred.
[0047]
[Example 3]
In this embodiment, a plastic part molded by the method of the present invention is used in a slot machine.
As shown in FIG. 7, the front decorative plates 132 and 134 of the slot machine 130 are manufactured in the same procedure using the same apparatus as in the first embodiment.
[0048]
Although these front decorative plates 132 and 134 have a complicated pattern (not shown), they can be manufactured by a single injection molding. Therefore, for example, the front decorative plates 132 and 134 are separately formed into a translucent part and another part. There is no need to mold each part with a different color. Accordingly, one mold and one molding operation are sufficient for each plastic part, and an operation for bonding a plurality of parts to one part after molding is not necessary. Accordingly, the number of molds is small and the manufacturing process is simplified.
[0049]
In addition, any color combination and any pattern need only be able to be colored on the film, and the restrictions on the color combination and pattern are virtually eliminated, and the degree of freedom in design is dramatically increased.
And by adopting the plastic parts of the gaming machine manufactured by this manufacturing method, it is possible to reduce the process and cost in the manufacturing side of the gaming machine, and entertain the player by the diversity of design be able to.
[0050]
As mentioned above, although embodiment of this invention was described according to the Example, this invention is not limited to such an Example, and it cannot be overemphasized that it can implement variously in the range which does not deviate from the summary of this invention.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a schematic configuration of an injection molding machine according to a first embodiment.
FIG. 2 is an illustration of a pattern printed on a film used in the injection molding machine of Example 1.
3 is a schematic diagram of a cross-sectional structure of the pattern of FIG.
4 is a front view of a pachinko machine to which plastic parts manufactured by the injection molding machine of Example 1 are attached. FIG.
5 is an explanatory diagram of a schematic structure of an injection molding machine according to Embodiment 2. FIG.
6 is a front view of a front frame to which a window frame manufactured in Example 2 is attached. FIG.
7 is a perspective view of the slot machine of Embodiment 3. FIG.
FIG. 8 is a perspective view of a conventional pachinko machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Injection molding machine, 12 ... Heating cylinder, 14 ... Nozzle, 16 ... Injection device, 18 ... Fixed plate, 20 ... Fixed mold, 22 ... Movable mold, 24 ... Movable plate, 26 ... Ram, 28 ... Mold closure Apparatus, 30 ... Film, 32 ... Supply roller, 34 ... Winding roller, 36a, 36b ... Recess, 38 ... Injection hole, 40 ... Polyester film, 42 ... Transparent red layer, 44 ... Transparent orange layer, 46 ... Opaque red layer 48 ... Silver layer, 50 ... Opaque green layer, 60 ... Corner decoration (plastic part), 62 ... Pachinko machine (game machine), 64 ... Game board, 66a, 68b ... Semicircle part, 68 ... Corner decoration, 68a ... circular part, 70a ... lower corner decoration, 72 ... upper lamp decoration, 72a, 72b, 72c ... lamp window,
80 ... Injection molding machine, 20a ... Fixed mold, 82 ... Air supply / exhaust port, 84 ... Hose, 90 ... Front frame of pachinko machine, 91 ... Window frame (plastic part), 92 ... Upper tray, 93 ... Lower tray 94 ... Ashtray, 95 ... Window, 97a-97e ... Lens part, 99a-99d ... Small window,
130 ... Slot machine (game machine), 132, 134 ... Front decorative plate (plastic parts)

Claims (5)

In manufacturing plastic parts for gaming machines,
A film having a colored portion containing a wiring circuit printed using an ink containing mica having a metal film is inserted into the mold, and the plasticized plastic is injected into the mold. A method of manufacturing a plastic part for a gaming machine, wherein the colored portion is transferred from the film to the plastic side or the film is integrated with the plastic. In the manufacturing method of the plastic parts of the gaming machine according to claim 1,
The plastic part is a plastic part that covers or incorporates lamps, and the wiring circuit is a wiring circuit for supplying electric power to the lamps. . In the manufacturing method of the plastic parts of the gaming machine according to claim 2 ,
The plastic is translucent, and the colored portion of the film that is the front surface of the lamps is colored using a translucent ink. . In the manufacturing method of the plastic parts of the gaming machine according to any one of claims 1 to 3,
A method of manufacturing a plastic part for a gaming machine, wherein the wiring circuit is multi-layered by covering the lower wiring circuit with an insulating material and providing another wiring circuit thereon . In manufacturing plastic parts for gaming machines,
After the film having a colored portion containing a wiring circuit printed using ink containing mica having a metal film is inserted into the mold, the inside of the mold is pressurized with gas, and the pressure is applied A plasticized plastic composition having foamability is injected into the mold, and the colored portion is transferred from the film to the plastic composition side, or the film is integrated with the plastic composition. The pressure by the gas is released after the surface layer portion of the plastic composition filling the mold is solidified.
A method of manufacturing a plastic part for an amusement machine.

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