JPH06170879A - Synthetic resin injection device - Google Patents

Abstract

PURPOSE:To permit the molding of a molded body having different colors, different resins, marble patterns and the like by a method wherein an injection device is provided with a plurality of gate pipes, communicated with the outlet port of fluid passage for injecting the resin and equipped with heaters around the peripheral surfaces thereof, and a stopper, opening and/or closing the communicating part, while resin is injected through the gate pipes. CONSTITUTION:An injection device 1 is provided with at least two sets of gate pipes 2a, 2b, formed so that the diameters of the tip ends 7 thereof are reduced, and the tip ends 7 of the gate pipes are communicated with the outlet port 3 of fluid passages for injecting resin while the other ends of the gate pipes 2a, 2b are communicated with a manifold 8. A communicating part 4 between the fluid passage outlet port 3 and the gate pipes 2a, 2b is provided with a stopper or a pipe 5, which opens and/or closes the communicating part 4, and the communicating part 4 is opened and/or closed by moving the pipe 5 up-and-down. On the other hand, the gate pipes 2a, 2b are provided with the necessary number of heaters 6. Different materials are injected through the gate pipes 2a, 2b whereby a molded body, having multi-layer structure, marble patterns and the like, can be molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin injection device, and an object thereof is to easily mold a molded product having a different colored synthetic resin or a synthetic resin of a different material, or a molded product having a marble pattern or the like. It is to provide a synthetic resin injection device which can be manufactured.

[0002]

2. Description of the Related Art Generally, as a device (A) for injecting a heated and fluidized synthetic resin into a mold (B), generally, as shown in FIG.
As shown in the figure, the fluid passage outlet (C) is attached to the bottom of the mold (B).
Was used, and the injection device (A) in which the cylinder (D) was connected to the fluid passage outlet (C) was used.
The heated and fluidized synthetic resin was injected into the mold (B) by this injection device (A).

[0003]

However, in order to mold a molded body having layers of synthetic resins of different colors or synthetic resins of different materials, synthetic resins of one color or one material are passed through a cylinder. After injecting the synthetic resin of No. 2 into the mold, another injection device must be used to inject the synthetic resin of another color or the synthetic resin of another material, which makes the work process complicated. there were. Further, in order to mold a molded product having a marble pattern or the like, it is necessary to mix synthetic resins of several colors in advance and then inject this synthetic resin, which causes a problem that the working process becomes complicated. It was

Therefore, the present invention provides a synthetic resin injection device capable of easily molding a molded product having a different color of synthetic resin or a synthetic resin of a different material, or a molded product having a marble pattern or the like. Is a technical issue.

[0005]

As a technical means for achieving the above object, the present invention has a synthetic resin injection apparatus configured as follows. That is, it is a device for injecting a heated and fluidized synthetic resin into a mold, and this device is composed of at least two or more gate pipes, and the tips of these gate pipes are formed in a diameter-reduced shape. The tip portion is communicatively coupled to a fluid passage outlet portion for injecting a synthetic resin into the mold, and a stopper for opening the communication portion is provided at a communication portion between the fluid passage outlet portion and the gate pipe. The present invention relates to a synthetic resin injection device, characterized in that a required number of heaters are provided on the peripheral surface of the gate pipe.

[0006]

The synthetic resin of different color or the synthetic resin of different material heated and fluidized from at least two or more gate pipes is injected into the mold through the fluid passage outlet. Therefore, it is possible to easily form a molded body obtained by clamping the mold with a multilayer structure. Further, synthetic resins of different colors or synthetic resins of different materials are simultaneously injected from the gate pipe. Therefore, it is possible to easily form a molded product obtained by clamping the mold with a marble pattern or the like. Further, the synthetic resin is injected from one gate pipe, and at the same time, the air is injected from the other gate pipe. Therefore, it is possible to foam the molded body formed by clamping the mold.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a cross-sectional explanatory view showing a synthetic resin injection device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional explanatory view showing a state in which the fluid passage outlet part and the gate pipe shown in FIG. 1 are in communication with each other.

(1) is an injection device for injecting a heated and fluidized synthetic resin into a mold (not shown). As shown in FIG. 1, this device (1) has at least two gate pipes ( 2a) and (2b). Note that the following description will be given using two gate pipes (2a) and (2b). The tip portions (7) of these gate pipes (2a) (2b) are formed in a reduced diameter. Further, the tips (7) of these gate pipes (2a) (2b) are connected to the fluid passage outlet (3) for injecting the synthetic resin into the mold so as to communicate therewith, and these gate pipes (2a) (2b) are connected. ) Is connected to the manifold (8) for communication. A pipe (5) serving as a stopper for opening the communication portion (4) is provided at a communication portion (4) between the fluid passage outlet portion (3) and the gate pipes (2a) (2b). There is. Hereafter, the pipe that plays the role of this stopper (5)
Is called a pipe (5).

By lowering the pipe (5) downward, the fluid passage outlet (3) and the gate pipes (2a) (2b) are brought into communication with each other as shown in FIG. It can be injected into the mold.
By raising the pipe (5) upward, the fluid passage outlet (3) and the gate pipes (2a), (2b) are closed, and the injection of the heated and fluidized synthetic resin into the mold is stopped. can do. A required number of heaters (6) are provided on the peripheral surfaces of the gate pipes (2a), (2b), and a cylindrical heater is provided in this embodiment. This heater (6) is connected to the gate pipes (2a) (2
By providing on the peripheral surface of b), the heated and fluidized synthetic resin is not cured.

The usage state of the injection device (1) will be described. First, the pipe (5) is lowered to bring the fluid passage outlet (3) and the gate pipes (2a) and (2b) into communication with each other, and then heated and fluidized in one color from the gate pipe (2a). The resin is injected into the mold through the fluid passage outlet (3). After injecting a required amount of synthetic resin, the pipe (5) is raised to close the fluid passage outlet (3) and the gate pipe (2a). Then, the mold is clamped to form the one-color synthetic resin injected into the mold into a required shape.

After the synthetic resin of one color formed in the required shape has hardened, the pipe (5) is lowered again to bring the fluid passage outlet (3) and the gate pipe (2b) into communication with each other. The heated and fluidized synthetic resin of another color is injected from the gate pipe (2b) into the mold through the fluid passage outlet (3). This mold is clamped to form the same shape as the one-color molded body. By injecting in this way, a molded body (not shown) having a bicolor layer can be molded. Further, by repeating the above steps in sequence, the molded body can have a multi-layer structure. still,
It is also possible to inject different synthetic resins from the gate pipes (2a) and (2b) to form the molded body into a multi-layer structure.

Further, heat-fluidized synthetic resins of different colors are simultaneously injected from the gate pipe (2a) and the gate pipe (2b) into the mold through the fluid passage outlet (3), and the mold is By clamping the mold, a molded body such as a marble pattern can be molded. Further, the synthetic resin heated and fluidized from the gate pipe (2a) is injected into the mold through the fluid passage outlet (3), and at the same time, air is injected from the gate pipe (2b) to close the mold. The molded body molded by the above method can be foamed. Of course, synthetic resin of the same color or synthetic resin of the same material may be injected from the gate pipes (2a) and (2b).

Thus, the two gate pipes (2a)
Since the synthetic resin heated and fluidized from (2b) is injected into the mold through the fluid passage outlet (3), the synthetic resins of different colors from the gate pipes (2a) and (2b), respectively. Alternatively, synthetic resins of different materials can be injected, and the molded body formed by clamping the mold can easily have a multilayer structure. In addition, since synthetic resins of different colors or synthetic resins of different materials can be simultaneously injected from the gate pipes (2a) and (2b), a molded body formed by clamping the mold can be easily marbled. Etc. can be formed. Furthermore, since it is possible to inject the synthetic resin from one gate pipe (2a) and at the same time to inject air from the other gate pipe (2b), it is possible to foam the molded body formed by clamping the mold. it can.

[0014]

INDUSTRIAL APPLICABILITY As described above, the present invention is an apparatus for injecting a heated and fluidized synthetic resin into a mold, which apparatus comprises at least two or more gate pipes, and the tip end portions of these gate pipes. Is formed in a reduced diameter,
These tips are connected to a fluid passage outlet for injecting a synthetic resin into the mold, and a stopper for opening the communication portion is provided at a communication portion between the fluid passage outlet and the gate pipe. Since the synthetic resin injection device is characterized in that a required number of heaters are provided on the peripheral surface of the gate pipe, the following effects are obtained. That is,
Since at least two or more gate pipes are respectively made to heat and fluidize the synthetic resin to be injected into the mold through the outlet of the fluid passage, the gate pipes are made of synthetic resins of different colors or different materials. A synthetic resin can be injected, and a molded body formed by clamping a mold can be easily formed into a multilayer structure. In addition, since synthetic resins of different colors or synthetic resins of different materials can be simultaneously injected from the gate pipes, it is possible to easily form a molded body formed by clamping the mold into a marble pattern or the like. You can Further, since it is possible to inject the synthetic resin from one of the gate pipes and at the same time to inject the air from the other gate pipe, it is possible to foam the molded body formed by clamping the mold.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing a synthetic resin injection device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional explanatory view showing a state in which the fluid passage outlet and the gate pipe shown in FIG. 1 are in communication with each other.

FIG. 3 is an explanatory cross-sectional view showing a conventional synthetic resin injection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding apparatus 2a Gate pipe 2b Gate pipe 3 Fluid passage outlet part 4 Communication part 5 Pipe 6 Heater 7 Tip part

Claims (1)

[Claims] 1. A device for injecting a heated and fluidized synthetic resin into a mold, the device comprising at least two or more gate pipes, and the tips of these gate pipes are formed in a reduced diameter shape. Together, these tips are connected to a fluid passage outlet for injecting a synthetic resin into the mold,
A stopper for opening the communication portion is provided at a communication portion between the fluid passage outlet portion and the gate pipe, and a required number of heaters are provided on a peripheral surface of the gate pipe. Synthetic resin injection device.