JP2002240074A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine which can separate waste plastics with adherent liquid into the plastics and the liquid without cleaning the waste plastics in a previous process, and can use the waste plastics. SOLUTION: In the injection molding machine 1, the axis of a heating cylinder 5 is slanted at a prescribed angle to raise the nozzle side 6, and a drain hole 7 is formed in the waste plastic 2 supply part 17 of the heating cylinder 5. By compressing the waste plastics 2 in the heating cylinder 5, the liquid 4 separated from the waste plastics 2 is made to flow down toward the supply part 17 to be discharged from a drain hole formed in the lower part of the vicinity of the supply part, so that the waste plastics can be separated into the plastics and the liquid 4 without cleaning the waste plastics in the previous process. In this way, the waste plastics can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding machine, and more particularly to an injection molding machine using a waste plastic material such as a discarded plastic container as a plastic material.

[0002]

2. Description of the Related Art In general, burning discarded plastic products not only generates high temperatures and damages the incinerator, but also releases environmental pollutants such as dioxin into the atmosphere. It has been promoted that such plastic products are molded into blocks and buried in the ground, or reused as plastic materials for other molded products.

In general, various liquid substances adhere to plastic containers collected from homes. For example, a container (waste plastic) with liquid substances adhered thereto is injection molded using a plastic material. Then, there is a risk that the injection device and the injection molding die will be hindered, or that the product will have molding defects. Therefore, it has been customary to wash the collected container in a process prior to injection molding, and to wash off the liquid substance attached to the container with water or a cleaning liquid.

However, cleaning in the pre-process of forming a container (waste plastic material) requires a new facility and requires a large amount of waste liquid discharged from the cleaning facility to be treated. Was costly.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and has been made in consideration of the above circumstances, and is capable of using a plastic container to which a liquid substance adheres as a plastic material without washing it in a previous step. An object is to provide a molding machine.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a waste plastic material to which a liquid substance is adhered is separated into a liquid substance and a plastic, and the waste plastic material is separated. An injection molding machine for melting a material, wherein a heating cylinder in which a screw is rotatably reciprocally inserted and inclined at a predetermined angle so that a nozzle provided at a tip is higher than a supply section of the waste plastic material, And a drain hole provided in a lower portion of the heating cylinder in the vicinity of a supply section of the waste plastic material.

According to the present invention, the liquid material thus separated can flow down toward the waste plastic material supply section of the heating cylinder and be discharged from the drain hole.

In order to achieve the above object, according to a second aspect of the present invention, the supply section of the waste plastic material is a pressure hopper which pressurizes and compresses the waste plastic material by a pressurizing means. It is characterized by the following.

According to the present invention, the waste plastic material can be pressurized by the pressurizing means of the pressure hopper, compressed and pressed by the screw, and supplied to the screw (in the heating cylinder). .

According to another aspect of the present invention, a space is provided below a nozzle of a heating cylinder and a tray is provided in the space. It is characterized in that the waste plastic material plasticized therein is injected from a nozzle and collected in a tray.

According to the present invention, the waste plastic material collected by the tray can be formed into a block shape and disposed of by disposing in this manner.

According to another aspect of the present invention, a waste plastic material plasticized in a heating cylinder is injected and filled into a mold cavity of an injection mold. It is characterized by the following.

According to the present invention, a waste plastic material from which a liquid substance has been separated can be regenerated as a plastic material for an injection molded article.

In order to achieve the above object, the invention according to claim 5 of the present invention provides a waste treatment in which a waste plastic material plasticized in a heating cylinder is collected by a tray and disposed of, And a regeneration process for injecting a plastic material into the mold cavity of the injection mold and regenerating the plastic material.

According to the present invention, a disposal process and a regeneration process can be selected as required.

In order to achieve the above object, the invention according to claim 6 of the present invention is characterized in that the pressure hopper is provided with cleaning means for discharging a cleaning liquid.

According to the present invention, the waste plastic material to which the liquid substance has adhered and the inside of the pressure hopper can be cleaned by the above-described structure.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An injection molding machine according to an embodiment of the present invention will be described with reference to FIGS. First, an outline of the injection molding machine 1 of the present embodiment will be described. The injection molding machine 1 according to the present invention is an injection molding machine 1 using a waste plastic material 2 to which a liquid substance adheres as a plastic material. In the embodiment, the liquid material 4 separated from the waste plastic material 2 by being compressed in the heating cylinder 5 by being inclined at 5 ° with respect to the horizontal The plastic material 2 is caused to flow toward the supply section 17 side (the left side in FIG. 1),
The structure can be used as a plastic material because the waste plastic material 2 can be separated into a liquid substance 4 and a plastic without being washed in a previous step, because the waste plastic material 2 can be discharged from a drain hole 7 provided at a lower portion in the vicinity of the plastic material 7. It has become.

Next, details of the injection molding machine 1 according to the present invention will be described. The heating cylinder 5 is installed on an inclined table 13 whose upper surface is inclined at a predetermined angle (5 ° in this embodiment), so that the axis forms a predetermined angle with respect to a horizontal plane. The heating cylinder 5 is provided with a screw 16 in which a groove having a required shape is screwed. The hydraulic motor 14 installed on the inclined table 13 is driven to drive the screw 16.
, The waste plastic material 2 supplied from the supply unit 17 is transferred to the nozzle 6 while being kneaded and plasticized along the wall surface of the heated inner cylindrical portion 5a, and is compressed and liquidized. The structure is such that the substance 4 is separated. Further, the heating cylinder 5 drives the hydraulic motor 14 installed on the inclined table 13 to advance the screw 16 (in the direction B in FIG. 1), so that the plasticized waste plastic in the heating cylinder 5 is heated. The material 2 is configured to be ejected from the nozzle 6.

In the heating cylinder 5, a drain hole 7 for discharging the liquid substance 4 separated from the waste plastic material 2 is provided on the base side of the heating cylinder 5 below the supply section 17 of the waste plastic material 2. The drain hole 7 is provided.
A waste liquid storage tank 8 for storing waste liquid is placed below the storage tank. As a result, the liquid substance 4 compressed and separated from the waste plastic material 2 in the process of being transferred by the screw 16 flows down the inner cylinder part 5 a of the heating cylinder 5, is discharged from the drain hole 7, and is discharged to the waste liquid storage tank 8. Will be stored.

The injection molding machine 1 according to the present invention is provided with the pressure hopper 3 in the supply section 17 for the waste plastic material 2 of the heating cylinder 5 and an air cylinder (pressurizing means) 9.
Is driven to lower the pressing plate 10 fixed to the shaft 9 a of the air cylinder 9, thereby pressing and compressing the waste plastic material 2 introduced into the pressure hopper 3 from the introduction port 11 to compress the screw 16. It is structured to supply to. Further, the pressure hopper 3 is provided with a ring-shaped pipe 12 having a plurality of perforations (not shown) at an upper portion of the internal space 3a, and a cleaning liquid supplied by a cleaning liquid supply pump (not shown) is provided. The pressure hopper 3 is discharged into the internal space 3a of the pressure hopper 3 from the perforation of the pipe 12 as required.

The pressurizing means is not limited to the air cylinder 9, but may be a hydraulic cylinder or the like provided that it has a mechanism capable of moving the pressing plate 10 up and down as required. Good. The pressing plate 10 has a pressure hopper 3 vertically separated by the pressing plate 10.
A plurality of holes (not shown) for communicating each of the internal spaces 3a are provided, and the holes (not shown) of the pipe 12 are provided.
Waste plastic material (container) pressed by the pressing plate 10 under the internal space 3a,
2 is provided. Further, the pressing plate 10 is provided with a cleaning liquid passage and a perforation (not shown), and the cleaning liquid is supplied to the cleaning liquid passage so that the cleaning liquid is supplied to the pressing plate 1.
It may be configured to release directly from zero.

The inclined table 13 on which the heating cylinder 5 is installed is
The tip of the nozzle 6 is supported by a base 20 installed on the base 18 so as to be slidable in the direction A in FIG. 1 and by driving a hydraulic cylinder 21 for nozzle touch installed on the base 20. The part is configured so as to approach and separate from the filling port of the injection mold 19 installed on the gantry 18. The tip of the nozzle 6 is formed in a spherical shape, so that even if the axis of the nozzle 6 is inclined, it can be brought into contact with the filling port of the injection mold 19 as required. Has become.

In the injection molding machine 1 according to the present invention, the front (left side in FIG. 1) of the injection mold 19 is formed lower than the injection mold 19 so that the space 22 is exposed. As shown in FIG. 1, the waste plastic material 2 injected from the nozzle 6 is provided below the tip of the nozzle 6 at a position where the tip of the nozzle 6 is retracted from the filling port of the injection molding die 19. A tray 23 for collecting the information is loaded.

The operation of the injection molding machine 1 according to this embodiment in such a configuration will be described. FIG. 1 shows an initial state of an injection molding machine 1 according to the present invention, in which a pressing plate 10 (air cylinder (pressurizing means) 9) is located at a rising end and an inclined table 13 is located at a retreating end. ing. First, the waste plastic material 2 to which the liquid substance 4 has adhered is put into the inlet 11 of the pressure hopper 3, and the air cylinder 9 is driven to lower the pressing plate 10 to pressurize and compress. Thus, the compressed waste plastic material 2 is supplied from the supply unit 17 to the screw 16 (in the heating cylinder 5). In addition,
When compressing the waste plastic material 2 to which the liquid substance 4 adheres in the pressure hopper 3, the cleaning liquid is discharged into the pressure hopper 3 as required. In this case, the released cleaning liquid is discharged from the drain hole 7 and stored in the waste liquid storage tank 8.

Next, by driving the hydraulic motor 14 to rotate the screw 16 in a required direction,
Plastic material (container) 2 compressed and supplied
Is transferred toward the nozzle 6 in the heating cylinder 5. On this occasion,
The waste plastic material 2 is compressed in the process of being transferred,
The liquid substance 4 is separated. Then, the separated liquid material 4 flows down toward the base side of the heating cylinder 5, is discharged from the drain hole 7, and is stored in the waste liquid storage tank 8.

As shown in FIG. 1, a plastic material kneaded and plasticized by a screw is supplied to a nozzle 6.
Is ejected from the front end of the container and flows down (drawing), is collected by the tray 23, is formed into a block shape, and is discarded (discarded).

On the other hand, when the plasticized plastic material is regenerated (regenerated) as a plastic material for an injection molded article, as shown in FIG. 2, the hydraulic cylinder 21 for nozzle touch is driven to move the inclined table 13. The tip of the nozzle 6 is brought into contact with the filling port of the injection mold 19 by moving forward, and further, the injection cylinder 15 is driven to slide the screw 16 toward the nozzle 6 so that the required amount of plastic is measured. The material is transferred to the injection mold 19.
Is injected and filled into a mold cavity (not shown).

The discarding process and the regenerating process can be selected as required by operating a selection switch (not shown).

[0030]

According to the first aspect of the present invention, since the axis of the heating cylinder is inclined at a predetermined angle so that the nozzle side becomes higher, the waste plastic material is compressed in the heating cylinder. This allows the liquid substance separated from the waste plastic material to flow down to the waste plastic material supply portion side of the heating cylinder, and to be discharged from a drain hole provided at a lower portion in the vicinity of the supply portion. The liquid substance 4 and the plastic can be separated without washing in the previous step, and can be used as a plastic material.

According to the second aspect of the present invention, the supply section of the waste plastic material is a pressure hopper which pressurizes and compresses the waste plastic material by the pressurizing means. It can be pressurized and compressed by the pressurizing means of the pressure hopper, pressed against the screw, and supplied to the screw (inside the heating cylinder).

According to the third aspect of the present invention, since a space is provided below the nozzle of the heating cylinder and a tray is provided in the space, the plastic material is plasticized and injected from the nozzle. Can be collected in a tray, formed into a block shape, and disposed of.

According to the fourth aspect of the present invention, the plasticized plastic material is injected and filled into the mold cavity of the injection mold, so that the waste plastic material can be used for the injection molded product. Can be recycled as plastic material.

According to the fifth aspect of the present invention, the waste plastic material is collected by a tray, formed into a block, and disposed, and the waste plastic material is formed into an injection molded product. A regeneration process for using a plastic material for regeneration can be selected as required.

According to the sixth aspect of the present invention, since the cleaning liquid is discharged into the pressure hopper by the cleaning means, the waste plastic material put into the pressure hopper is cleaned to remove the waste plastic material. By washing away the liquid substance attached to the odor, it is possible to prevent the generation of an odor.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an injection molding machine according to the present embodiment,
It is a figure which shows the state which collect | recovers a waste plastic material plasticized in the heating cylinder with a tray, shape | molds, and disposes.

FIG. 2 is an explanatory view of the injection molding machine of the present embodiment,
It is a figure which shows the state which injects the waste plastic material plasticized in the heating cylinder into the metal mold cavity of an injection molding die, and performs a regeneration process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection molding machine 2 Waste plastic material 3 Pressure hopper 4 Liquid substance 5 Heating cylinder 6 Nozzle 7 Drain hole 8 Waste liquid storage tank 9 Air cylinder (pressurizing means) 12 Pipe (cleaning means) 16 Screw 19 Injection mold 22 Space 23 tray

Claims (6)

[Claims] 1. An injection molding machine for separating a waste plastic material to which a liquid substance adheres into a liquid substance and a plastic to melt the waste plastic material, wherein a screw is rotatably reciprocally fitted and provided at a tip end. It is characterized by comprising a heating cylinder inclined at a predetermined angle so that the nozzle is higher than a supply section of the waste plastic material, and a drain hole provided at a lower portion of the heating cylinder near a supply section of the waste plastic material. Injection molding machine. 2. The injection molding machine according to claim 1, wherein the supply section of the waste plastic material is a pressure hopper that presses and compresses the waste plastic material by a pressurizing unit. 3. A space is provided below the nozzle of the heating cylinder, and a tray is provided in the space. A waste plastic material plasticized in the heating cylinder is injected from the nozzle and collected by the tray. The injection molding machine according to claim 1 or 2, wherein the injection molding is performed. 4. The injection molding machine according to claim 1, wherein the waste plastic material plasticized in the heating cylinder is injection-filled into a mold cavity of an injection mold. 5. A waste treatment for collecting and discarding waste plastic material plasticized in the heating cylinder in the tray, and reclaiming the waste plastic material by injection filling the mold into a mold cavity of the injection mold. The injection molding machine according to any one of claims 1 to 4, wherein a reproduction process to be performed is selectively provided. 6. An injection molding machine according to claim 1, further comprising a cleaning means for discharging a cleaning liquid into said pressure hopper.