JP2000052345A - Compression feeder for film-mixed waste plastic - Google Patents

Abstract

(57) [Summary] (Modified) [PROBLEMS] A compression feeder for a film-based mixed waste plastic for improving the processing efficiency of a melt granulation apparatus. SOLUTION: A cylinder mechanism having a device main body 4 composed of a horizontal tubular body constituting a cylinder portion, and a compression cylinder rod 2a horizontally inserted from one side of the device main body and movable horizontally in the device main body. A hopper 1 is provided at the upper part of the apparatus main body, and the film 9 is dropped into the apparatus main body after being put into the hopper, and the other side of the cylindrical apparatus main body is provided with a vertical cylindrical body. And a cylinder mechanism 3 having a discharge cylinder rod 3a vertically inserted from above the discharge port and vertically movable in the discharge port, provided in the hopper, and dropped into the apparatus body. The film is compressed in the compression section 4a of the apparatus main body by the compression cylinder rod. The compressed film is extruded downward by the discharge cylinder rod 3a and supplied to the melt granulation apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reusing (recycling) waste plastics, and more particularly to a pretreatment technique for converting plastics in general and industrial wastes into granules suitable for pneumatic transportation. More specifically, a film-type mixed waste plastic compression / supply device for enhancing the granulation efficiency of the film-type mixed waste plastic and making the granular material composed of the waste plastic widely usable as a raw material for a blast furnace or a solid fuel. It is about.

[0002]

2. Description of the Related Art Research has been conducted on the use of waste plastic in general waste and industrial waste (hereinafter referred to as "waste plastic") as a raw material for blast furnaces. In order to use the waste plastic as a raw material for the blast furnace, it is necessary to process the waste plastic into a shape having a certain size or less (usually about 10 mm or less on one side) suitable for blowing (pneumatic transportation). Therefore, crushing and crushing are performed on the lump-shaped plastic in the waste plastic. on the other hand,
Film-based mixed waste plastic (hereinafter referred to as “film”) in waste plastic is subjected to specific gravity separation by a specific gravity separation device in order to remove harmful substances such as PVC (polyvinyl chloride) contained therein, or For the purpose of reuse for blast furnace blowing, etc., a hot granulation is performed by a melting granulator and granulated into particles.

As a means for heating and granulating the above-mentioned film, a melt granulation method comprising the following is known. That is, the film is crushed to an appropriate size, then foreign matter such as metal is separated and removed, and then the film is heated to the melting point of the plastic by frictional heat or external heating while stirring, and then melted. It is cooled to below the melting point by cooling means and granulated.

[0004]

In the melt granulation for performing the heat granulation as described above, it is general to carry out a crushing treatment in advance to remove metals. However, since the crushed film has an extremely low bulk density, a large space is required for various handling (handling) such as transport, transportation, and storage of the film, and the throughput of the melt granulation apparatus is small for the bulk. There is a problem.

[0005] In addition, since the apparent density of a film varies over a very wide range depending on the material, it is difficult to supply a constant amount of the film. Further, when a heat granulation is performed in which the film is heated and melted by frictional heat or external heating while stirring the film by the melt granulator, the plastic (film) is formed.
There was also a problem that the input amount of fluctuated greatly, and as a result, the time required for temperature rise fluctuated, and stable operation became difficult.

[0006] In view of the above, we studied the compression of a film by a conventional compression device in order to increase the bulk specific gravity of the film before the film was put into the granulating device. FIG. 5 is a sectional view showing a conventional compression device. The compression device 8 has a screw type structure in which the screw type compressor 6 rotates in a cylindrical main body. The film supplied to the hopper 1 is pushed and compressed by the screw compressor 6 in the cylindrical body, and is discharged as a compressed material from the nozzle 7 having a narrow outlet.

However, when the film is compressed by the compression device shown in FIG. 5, the film is partially heated to a temperature higher than the melting point of the plastic due to frictional heat during compression, and fusion occurs. Further, even when the film is not heated to a temperature higher than the melting point, the film stretched by the pressure is entangled, and there is a problem that the subsequent specific gravity separation operation and melt heating operation become impossible.

Accordingly, an object of the present invention is to provide a film-type mixed waste plastic compression / supply device capable of compressing a film without increasing the above-mentioned problems and increasing the bulk density and supplying the film-mixed plastic to a melt granulation device. It is in.

[0009]

According to the first aspect of the present invention,
In a compression feeding device for increasing the bulk density of the film-based mixed waste plastic, an apparatus main body composed of a cylindrical body constituting a cylinder portion, and for compressing the film-based mixed waste plastic in the apparatus main body, And a compression cylinder mechanism having a compression cylinder rod that is movable within the apparatus main body.

According to a second aspect of the present invention, there is provided a compression feeding device for increasing the bulk density of a film-based mixed waste plastic, wherein the device main body comprising a cylindrical body constituting a cylinder portion; A compression cylinder mechanism having a compression cylinder rod movable in the apparatus body for compressing the system-mixed waste plastic; and the film-based mixed waste plastic compressed by the compression cylinder mechanism from the apparatus body. And a discharge cylinder mechanism having a discharge cylinder rod movable in the apparatus main body for discharging.

In the compression treatment as a pretreatment for melt-granulation of the film, it is desirable to reduce the volume of space between the films and to compress the film (plastic) at a pressure that does not involve irreversible deformation. . According to the apparatus of the present invention, since the compression strength can be controlled by the movement amount of the compression cylinder rod, the compression ratio can be adjusted according to the material and properties of the film-based plastic. As a result, the plastic can always be compressed with a pressure that does not involve irreversible deformation of the film, and the bulk density of the film can be greatly improved.

[0012]

Next, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a sectional view showing a compression supply device according to Embodiment 1 of the present invention. In addition, the film 9 is shown by hatching for convenience of explanation. The compression supply device according to the present invention includes an apparatus main body 4 formed of a horizontal tubular body constituting a cylinder portion, and a compression cylinder inserted horizontally from one side of the apparatus main body 4 and movable horizontally in the apparatus main body 4. And a sliding cylinder mechanism 2 having a rod 2a. An arrow A in FIG. 1 indicates a moving direction of the compression cylinder rod 2a. The slide-type cylinder mechanism 2 has a sensor that detects the position of the tip (head) of the cylinder rod 2a and a mechanism that can variably adjust the amount of movement of the cylinder rod 2a.

A hopper 1 is provided on the upper part of the apparatus main body 4, and the film 9 is loaded into the hopper 1,
It is designed to fall into. On the other side of the cylindrical device main body 4, an outlet 5 formed of a vertical cylindrical body, and an outlet 5
Cylinder mechanism 3 having a discharge cylinder rod 3a vertically inserted from above and vertically movable in the discharge port 5.
Are provided. The arrow B in FIG. 1 indicates the moving direction of the discharge cylinder rod 3a.

The film 9 which has been put into the hopper 1 and dropped into the apparatus main body 4 is compressed in the compression section 4a of the apparatus main body 4 by the compression cylinder rod 2a. At this time,
The compression ratio is determined by the amount of movement of the compression cylinder rod 2a. Therefore, by setting this movement amount, it is possible to perform compression at an optimum compression ratio for the loaded film. The compressed film 9 is discharged from the cylinder rod 3a.
And is ejected downward and discharged out of the compression device. Then, it is supplied to a melt granulation apparatus (not shown).

In the present embodiment, the number of the compression cylinder rods of the compression cylinder mechanism is one, but the cylinder portion of the apparatus main body 4 and the compression cylinder rod 2a are two.
A configuration may be provided in which the film is compressed from two or more directions.

FIG. 2 is a sectional view showing a compression feeder according to a second embodiment of the present invention. The device shown in FIG. 2 has no hopper. The film 9 is attached to the device body 4
In the above, it is compressed by the horizontally moving compression cylinder mechanism 2 and discharged downward by the vertically moving discharge cylinder mechanism 3.

FIG. 3 is a sectional view showing a compression feeder according to Embodiment 3 of the present invention. The apparatus shown in FIG. 3 is compressed by a horizontally moving compression cylinder mechanism 2 in an apparatus main body 4 below the hopper 1, and is fed into a discharge port 5 by a horizontally moving discharge cylinder mechanism 3,
It is pushed downward by the pushing machine 10.

FIG. 4 is a sectional view showing a compression feeder according to a fourth embodiment of the present invention. The apparatus shown in FIG. 4 is compressed by an obliquely moving compression cylinder mechanism 2 in an obliquely provided apparatus body 4. The compression cylinder mechanism 2 is also used for discharging. When the compression cylinder mechanism 2 is moved up and down a plurality of times to compress the film to a desired compression ratio, the shutter 11 is opened and the film is discharged by pushing the film downward.

[0019]

As described above, according to the present invention, the following useful effects can be obtained. (1) The bulk density of the film can be reliably increased by the slide-type cylinder mechanism. (2) The bulk density of the film can be increased 5 to 10 times that of the conventional film, the melt granulation efficiency can be improved, and the granulation processing amount can be increased. (3) The film can be compressed without causing fusing due to frictional heat or entanglement between the films, and handling (handling) such as conveyance, transportation and storage is improved. (4) Since the strength of compression can be controlled by the amount of film input and the amount of movement of the compression cylinder, the compression ratio can be adjusted according to the material and properties of the film.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a compression supply device according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view showing a compression supply device according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a compression supply device according to Embodiment 3 of the present invention.

FIG. 4 is a sectional view showing a compression supply device according to Embodiment 4 of the present invention.

FIG. 5 is a sectional view showing a conventional compression device.

[Description of Signs] 1: Hopper 2: Cylinder mechanism for compression 2a: Cylinder rod for compression 3: Cylinder mechanism for discharge 3a: Cylinder rod for discharge 4: Device body 4a: Compression unit 5: Discharge port 6: Screw compressor 7: Nozzle 8: Compression device 9: Film-based mixed waste plastic 10: Pusher 11: Shutter

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshio Tsuboi 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 4F201 AG01 BA05 BC02 BC12 BC25 BC37 BP25 BP31 BP40 BQ11 BQ17

Claims (2)

[Claims] 1. A compression feeding device for increasing the bulk density of a film-based mixed waste plastic, wherein an apparatus main body comprising a cylindrical body constituting a cylinder portion, and wherein the film-based mixed waste plastic is compressed in the apparatus main body. And a compression cylinder mechanism having a compression cylinder rod movable in the apparatus main body. 2. A compression feeding device for increasing the bulk density of a film-based mixed waste plastic, comprising: an apparatus main body composed of a cylindrical body constituting a cylinder portion; and a device for compressing the film-based mixed waste plastic in the apparatus main body. A compression cylinder mechanism having a compression cylinder rod movable in the apparatus body, and the film-based mixed waste plastic compressed by the compression cylinder mechanism is discharged from the apparatus body. And a discharge cylinder mechanism having a discharge cylinder rod that is movable in the apparatus main body.