TWI606911B - Injection moulding and the mould - Google Patents

Description

Injection molding machine and surface decoration mold used therefor

The present invention relates to an injection molding machine and a mold used therefor, and more particularly to an injection molding machine that can integrate a mold for injection molding and surface decoration.

In recent years, notebook computers, mobile phone cases, or tablet computers have often used plastic or metal casings of various shapes.

In the manufacturing process of the outer casing product, a commonly used injection molding machine includes a mold for forming a cavity (for injection of a thermoplastic resin). After the plastic or metal material is injected toward the cavity, the mold is cooled, and the raw material is solidified to manufacture a plastic outer casing.

The Republic of China Patent No. 590871 "Resin Forming Machine" provides a resin molding machine which can reduce the cost without requiring a waste extractor, and can shorten the cycle time while reducing the amount of waste. The resin molding machine of the present invention comprises: a fixed side mother die plate 13 having a gate 13a connected to the master mold C; and a sprue bushing 16 formed to be supplied to the master mold through the gate 13a. In the case of the runner 16a of the C-forming material, the resin molding machine is characterized by comprising: a cylinder mechanism (flow path plate driving means) 25 for arranging a flow path between the fixed-side mother die plate 13 and the sprue bushing 16 The plate 20, and the flow path plate 20 is discharged at the forming position A, and at a position different from the forming position A The exit positions B1 and B2 are linearly moved back and forth; and a discharge passage (waste discharge means) 30 for discharging the waste material at the discharge position B1 or B2.

The method of beautifying the outer casing by attaching the ink to the outer casing by coating means causes environmental problems, and thus the method has been completely prohibited.

It is customary to attach a film or a film transfer ink to beautify the outer casing or to attach the desired function to the outer casing. Therefore, the main methods in the industry are classified into in-mold decoration and exterior decoration.

Wherein, the in-mold decoration is a method in which a film or an ink is placed in a mold in advance, and the method mainly comprises two steps: a first process, the ink is placed in a high-pressure molding machine, and the steps of heating, vacuuming, high-pressure, etc. are formed into a film. In the second process, the formed film is placed into the mold of the molding machine to perform the injection plastic operation, that is, the injection plastic is combined with the film, thereby enhancing the structural strength and beautifying the appearance of the finished product.

In addition, the mold decoration is carried out on the surface of the finished plastic or metal casing for film bonding, which also comprises two steps: a first process, using an injection molding machine to perform an injection operation, thereby obtaining an injection molded article; In the process, the injection molded article was taken out by an injection molding machine, and the injection molded article was subjected to film attachment using a vacuum forming apparatus.

However, according to the above method, in the second step of the in-mold decoration, the film formed by the ink is placed in the mold, and when the plastic is injected, the heat resistance temperature of the ink is about 135 ° C, and the plastic temperature is 200 ° C or more. Therefore, there will be problems in that the contact temperature is too high and is washed away.

In addition, if the mold decoration is used, the first step must be performed, that is, after the injection molding machine is used to inject the molded casing, and then placed in a vacuum forming apparatus for film attachment, but the mold decoration method must pass After forming, it is taken out and then decorated with another equipment. The steps are too complicated to be completed in the same process.

Moreover, the above method has a problem that the precise relationship between the film and the mold will be changed, so that the outer casing after the injection molding has a problem of poor adhesion to the film, and even causes defective products.

Therefore, how to completely improve the production methods and equipment shortage of existing casings, and provide an economically viable technical solution and equipment, is the direction that the industry should explore and break through.

The present invention has been made in view of the above technical background, and an object of the present invention is to provide an injection molding machine having a double-sided mold, whereby the first process of the mold decoration can be integrated with the second process, thereby having high productivity. And can produce a finished product with excellent appearance.

To achieve this object, the present invention provides the following means.

[1] A surface decoration mold for use in a mold of a two-color injection molding machine, comprising: an injection male mold having a vacuum air passage; and a first master mold located on a primary side of the two-color injection molding machine, Forming a first cavity formed by injecting the raw material into the injection male mold and closing the first female mold into a preliminary molded product; decorating the male mold, the decorative male mold has a vacuum air passage; and the second female mold is located in the two-color mold The second side of the injection molding machine is closed, the second female mold is closed with the decorative male mold by movement, and a film is attached to the surface (inner surface) contacting the decorative male mold, and the second female mold has plasticity Airway and heater; A rotating disk is coupled to the shooting male mold and the decorative male mold, and the rotating male mold on the primary side is rotated to the secondary side by the rotation thereof.

[2] The surface decorative mold according to the first aspect, wherein the preliminary molded article is moved to the secondary side by the rotating disk, and is closed to the second female die by the male die or the decorative male The vacuum air passage on the mold is evacuated to bond the film to the preliminary molded article.

[3] The surface decoration mold according to the above item 1, wherein the film is transported to the inner surface side of the second mother mold by using a film supply; when the film is attached to the second mother mold, The heater on the two master molds is preheated; and the heater on the second master mold has a lower temperature than the melting point of the plastic material.

[4] The surface decorative mold according to [1], wherein the second master mold has a cutting tool.

[5] The surface decorative mold according to the above item 1 or 2, wherein the film is printed with a pattern or a character in ink, and the ink is any one of a thermal transfer ink or a thermal sublimation ink.

[6] The surface decorative mold according to the item 5, wherein the ink is transferred to the surface of the preliminary molded article.

[7] The surface decorative mold according to the above item 1 or 2, wherein the material of the film is any one of polycarbonate or polyethylene; and the surface decorative mold is made of metal.

[8] An injection molding machine characterized by being a two-color injection molding machine and having the surface decoration mold according to any one of items 1 to 7.

According to the invention of [1], in the surface decorative mold of the present invention, by projecting the male mold and the first master mold on the primary side, when the raw material is injected, the first cavity formed by the two can be closed. It can be formed into a preliminary molded article. Further, the injection male mold having the preliminary molded product is moved to the secondary side by the rotary disk, and the first molding is bonded to the film on the inner surface of the second female mold to complete the surface decoration of the preliminary molded product. .

According to the invention of [2], since the film is bonded to the preliminary molded article by vacuuming the vacuum air passage on the injection male mold or the decorative male mold, there is no wrinkle between the film and the preliminary molded product. The pleats provide an injection molded article having a beautiful appearance or an injection molded article having a desired function.

According to the invention of [3], since the film is conveyed from the film supply device to the inner surface side of the second mother die, the film can be continuously provided for surface decoration, and since the second mother die has a heater, it can be preheated. The film makes it easier for the film to be bonded to the preliminary molded article. Further, since the heater on the second mother die is set to have a lower melting point than the plastic material, the ink printed on the film is not diffused. Or it is scattered, so that it can provide a beautiful appearance of the injection molded article.

According to the invention of [4], since the second master mold has the cutting tool, when the film is bonded to the preliminary molded article, the film can be immediately cut to an appropriate size, thereby providing an injection molded article having a beautiful appearance.

According to the inventions of [5] and [6], since the surface of the film has a pattern or a character formed by the ink, when the preliminary molded article is attached, it can be beautified by the attachment of the film itself or the transfer of the ink thereon. The function of injection molding is given.

According to the invention of [7], it is possible to provide an injection molded article having a beautiful appearance.

According to the invention of [8], the step of injecting the molded article and the step of decorating the surface film can be integrated by the injection molding machine of the present invention, and the surface decorative film can be formed while the molded article is injected in the same process. Thereby improving productivity and continuous production of injection molding for 24 hours Product.

1‧‧‧Mold

11‧‧‧ shot public model

111‧‧‧vacuum airway

12‧‧‧ first mother model

13‧‧‧Decorative male model

131‧‧‧vacuum airway

14‧‧‧Second master

141‧‧‧ inner surface

142‧‧‧heater

143‧‧‧Plastic airway

15‧‧‧ rotating disk

16‧‧‧First cavity

17‧‧‧One side

18‧‧‧second side

19‧‧‧Second cavity

2‧‧‧First injection nozzle

3‧‧‧Second injection nozzle

4‧‧‧Preliminary molded products

5‧‧‧Materials

6‧‧‧film supply

61‧‧‧film

7‧‧‧ Injection molding machine

Fig. 1 is a side view showing a preferred embodiment of the surface decorative mold of the present invention.

Fig. 2 is a schematic view showing an injection molding step when the surface decorative mold of the present invention is used.

Fig. 3 is a view showing the use of the rotary disk of the present invention to transfer the injection male mold on the primary side to the secondary side.

Fig. 4 is a view showing a step of attaching a film when the surface decorative mold of the present invention is used.

Fig. 5 is a side view showing a preferred embodiment of the injection molding machine of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Figure 1 shows a preferred embodiment of a surface finishing mold in accordance with the present invention. a surface decoration mold 1 comprising an injection male mold 11, a first female mold 12, a decorative male mold 13, a second female mold 14, and a rotating disc 15; and a first injection nozzle 2 and a second injection nozzle The 3 series are respectively adjacent to the primary side 17 and the secondary side 18 of a surface decorative mold 1.

The injection male mold 11 has a vacuum air passage 111 on an inner side surface in contact with the first female mold. After the first female mold 12 and the injection male mold 11 are closed, the raw material 5 is injected to the injection male mold 11 . And the first cavity 16 formed when the first master 12 is closed causes the preliminary molded article 4 to be formed.

In the present specification, "primary side 17" means the side where the first master is placed.

The decorative male mold 13 has the same configuration as the injection male mold 11, and has a vacuum air passage 131.

The second female mold 14 is closable with the decorative male mold 13 via a movement, and a film 61 is attached to the surface (the inner surface 141) that is in contact with the decorative male mold 13. In addition, the second female mold 14 has a heater 142 and a plastic air passage 143 on the surface (the inner surface 141) that is in contact with the decorative male mold 13, wherein the heater 142 is used when the film 61 is attached to the first In the case of the second master mold 14, the film 61 is preheated while the film 61 is attached to the inner surface 141 by the negative pressure in the plastic air passage 143.

In the present specification, the "secondary side 18" means the side where the second master mold 14 is located. Further, as shown in FIG. 1, the second injection nozzle 3 is placed outside the secondary side 18 of the surface decorative mold 1.

The rotating disk 15 is pivotally coupled to the injection male die 11 and the decorative male die 13 to rotate the injection male die 11 on the primary side 17 to the secondary side 18 and to decorate the male die 13 Go to the primary side.

As shown in FIG. 2, after the injection male mold 11 and the first female mold 12 are closed, the raw material is projected into the first film chamber 16 to be formed into the preliminary molded product 4.

As shown in FIG. 3, after being formed into the preliminary molded article 4, the mold can be opened and the preliminary molded article 4 is moved to the secondary side 18 by the rotary disk 15.

As shown in FIG. 4, by adhering to the second female mold 14 to close each other, the film 61 adsorbed on the second master mold 14 can be coated on the preliminary molded article 4, or the ink on the film 61 can be transferred. To the preliminary molded article 4.

Further, when the preliminary molded product 4 is moved to the secondary side 18 and is closed to the second female mold 14, the vacuum air passages 111, 131 on the male mold 11 can be evacuated. The film 61 is bonded to the preliminary molded article 4, or the ink on the film 61 is transferred onto the preliminary molded article 4.

As shown in FIG. 5, the film 61 is conveyed to the inner surface 141 of the second mother die 14 by using a film supply 6 to transport the film 61.

Since the film 61 is conveyed to the inner surface 141 side of the second mother die 14 by using the film supply 6, the film 61 can be provided without interruption, and the injection male die 11 and the second female die 14 having the preliminary molded article 4 are provided. When closed, the film 61 can be attached to the preliminary molded article 4, or the ink on the film 61 can be transferred onto the preliminary molded article 4.

Further, when the decorative male mold 13 is turned to the primary side, it can be used as a male mold, and the same steps as described above can also produce the same injection-molded article coated with a film.

As described above, with the surface decorative mold of the present invention, the step of projecting the molded article and the step of decorating the film can be carried out by continuously rotating the rotary disk 15 to perform the surface decorative film while emitting the preliminary molded article in the same process. Thereby, the productivity is improved, and the injection molded article can be continuously produced for 24 hours.

[The possibility of industrial use]

In the surface decorative mold of the present invention, the injection molding step and the surface decoration step can be integrated, and the injection molding machine using the surface decoration mold can perform the injection molding and the surface device in the same process, thereby improving the productivity of the injection molded article.

The terms and descriptions used herein are for describing embodiments of the invention, but the invention is not limited thereto. It is to be understood that any equivalents of the features disclosed and described herein are not to be construed as limited.

1‧‧‧Mold

11‧‧‧ shot public model

111‧‧‧vacuum airway

12‧‧‧ first mother model

13‧‧‧Decorative male model

131‧‧‧vacuum airway

14‧‧‧Second master

141‧‧‧ inner surface

142‧‧‧heater

143‧‧‧Plastic airway

15‧‧‧ rotating disk

17‧‧‧One side

18‧‧‧second side

2‧‧‧First injection nozzle

3‧‧‧Second injection nozzle

Claims (7)

A surface decoration mold for use in a mold of a two-color injection molding machine, comprising: a shot male mold having a vacuum air passage; and a first master mold disposed on a primary side of the two-color injection molding machine to eject the raw material to The first mold cavity formed when the injection male mold and the first female mold are closed is formed into a preliminary molded product; a decorative male mold has a vacuum air passage; and a second female mold is located in the two-color injection molding machine. On the secondary side, the second female mold can be closed with the decorative male mold via movement, a film is attached to an inner surface of the decorative male mold, and the second female mold has a plastic air passage and a heater. And a rotating disk, which is coupled to the shooting male mold and the decorative male mold, and the rotating male disk is rotated to rotate the rotary male disk to the secondary side and the decorative side is located on the secondary side. The male model is turned to the primary side. The surface decoration mold according to claim 1, wherein the preliminary molded article is moved by the rotary disk to the secondary side and is closed to the second female die by the male mold or the decoration The vacuum air passage on the male mold is evacuated to bond the film to the preliminary molded product to form an injection molded article. The surface decoration mold according to claim 1, wherein the film is transported to the inner surface side of the second female mold by using a film supply; when the film is attached to the second female mold, The heater on the second master is preheated at a temperature lower than the melting point of the plastic material. The surface decorative mold according to claim 1 or 2, wherein the film is printed with a pattern or a character in ink, and the ink is any one of a thermal transfer ink or a thermal sublimation ink. The surface decorative mold according to claim 4, wherein the ink is transferable to the surface of the preliminary molded article. The surface decoration mold according to claim 1 or 2, wherein the material of the film is any one of polycarbonate or polyethylene, and the surface decoration mold is made of metal. An injection molding machine is a two-color injection molding machine having the surface decoration mold described in any one of claims 1 to 6.