JP3137543B2 - Method and apparatus for regenerating synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for regenerating a synthetic resin.

[0002]

2. Description of the Related Art Conventionally, in order to recycle a synthetic resin piece from a synthetic resin piece to which mud or sand has adhered, a method of separating mud or sand from a synthetic resin piece is to use water or a solvent, And a wet method of separating by applying high vibration.
As an apparatus using this wet method, an injection nozzle for discharging cleaning water toward the synthetic resin material supplied to the cutting position is provided before the cutting position between the rotary blade and the fixed blade disposed inside the cutting machine. Is known (Japanese Utility Model Laid-Open No. 5-67378).

[0003] However, the wet method and its apparatus have the following disadvantages. Water, light and heat costs for washing and drying. It is necessary to treat the solid with a sediment, and it is necessary to provide a sedimentation tank. It is necessary to treat the used water and solvent, and it is necessary to provide a treatment pond. After washing, drying is required, which increases the number of processing steps and costs for drying equipment. Therefore, the running cost is high, the equipment cost is high, the system line is large, and a large installation area is required.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to separate a mud or sand and a synthetic resin piece from a mud or sand attached synthetic resin piece in order to recycle the synthetic resin.
It is an object of the present invention to provide a method and an apparatus thereof that require low running costs and equipment costs and require a small installation area.

[0005]

According to the present invention, there is provided a method for regenerating a synthetic resin, wherein a rotatable roller is provided in a rotatable drum, the center of rotation of the drum and the center of rotation of the roller are parallel to each other, and In the eccentric polishing machine, the synthetic resin pieces with mud or sand are supplied to the gap between the drum and the roller, and the synthetic resin pieces are rubbed by the rotation of the drum and the roller. It is characterized by grinding and cutting to separate mud or sand from synthetic resin pieces.

Further, in the synthetic resin regenerating apparatus of the present invention, a rotatable roller is provided in a rotatable drum,
The center of rotation axis of the drum and the center of rotation axis of the roller are parallel,
The eccentric polishing machine is characterized in that a screen is provided at the outlet of the material to be polished.

The synthetic resin used in the present invention is, for example,
There is no particular limitation as long as it can be made into synthetic resin pieces by means such as pulverization and cutting, for example, polyvinyl chloride,
Examples include polyethylene, polypropylene, and polystyrene. The size of the synthetic resin piece is not particularly limited, but is preferably 3 to 10 mm from the viewpoint of easy separation.

[0008] The screen used in the above apparatus is for classifying the separated mud or sand from the synthetic resin pieces, and the mesh spacing is the size of the synthetic resin pieces obtained by grinding and cutting. Is selected as appropriate, but usually
It is about 0.5 to 2 mm.

[0009]

According to the present invention, there is provided a method for regenerating a synthetic resin, wherein a rotatable roller is provided in a rotatable drum, and a center of rotation of the drum and a center of rotation of the roller are parallel and eccentric. Using the gap between the drum and roller,
Since the synthetic resin pieces to which mud or sand are attached are supplied and the drum and the roller are rotated, the gap between the drum and the roller fluctuates, and the synthetic resin pieces that have entered the gap rub against each other. Polish and cut the surface of the synthetic resin piece,
Mud or sand is separated from the synthetic resin pieces.

In the synthetic resin recycling apparatus of the present invention,
Since the gap between the drum and the roller fluctuates due to its rotation, the synthetic resin pieces with mud or sand adhered to each other, and the synthetic resin pieces entering the narrow gap between the drum and the roller rub against each other. Is polished and cut to separate the mud or sand from the synthetic resin pieces. Then, the screen is classified into mud or sand and synthetic resin pieces.

Embodiments of the present invention will be described below. First,
A reproducing apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a mechanism of an example of the reproducing apparatus of the present invention, and FIG. 2 is a view taken along the line II-II of FIG.

The polishing machine 1 comprises a drum 2, rollers 3, an inlet 4 and an outlet 5. Drum 2
Is mounted on the rotating shaft 21 and is rotatable by driving the rotating shaft 21. A roller 3 is provided in the drum 2, and the roller 3 is attached to a rotation shaft 31,
The rotation of the rotating shaft 31 is enabled.

The rotating shaft 21 of the drum 2 and the rotating shaft 31 of the roller 3 are parallel, and the center 22 of the rotating shaft of the drum 2 and the center 32 of the rotating shaft of the roller 3 are eccentric.

The discharge port 5 is connected to the input port 4 with respect to the drum 2.
And the separated mud or sand and the synthetic resin pieces are discharged from the bottom 51 of the discharge port 5. Reference numeral 6 denotes a synthetic resin piece introduced from the introduction port 4.

The screen 8 faces the bottom 51 of the outlet 5.
Is provided. In this device, the screen 8
A cylindrical screen is used, and is provided by fitting and inserting this into the drum 2.

Reference numeral 9 denotes a synthetic resin piece discharge port, and 10 denotes a mud or sand discharge port. Reference numeral 11 denotes a casing, and 12 denotes a transport brush. The inner peripheral surface of the drum 2 and the outer peripheral surface of the roller 3 are subjected to a ceramic surface treatment to prevent abrasion.

FIG. 3 shows another embodiment of the apparatus of the present invention.
The configuration is such that two rollers 3a are provided side by side. The other configuration is the same as that of the device shown in FIGS.

Next, the method of the present invention will be described with reference to the apparatus shown in FIGS.

While rotating the drum 2 and the roller 3 of the polishing machine 1, the synthetic resin piece 6 to which mud or sand adheres is charged from the charging port 4. The injected synthetic resin pieces 6 to which mud or sand adheres are compacted on the inner wall of the drum 2 by centrifugal force generated by the rotation of the drum 2. Since the rotation of the roller 3 is eccentric to the rotation of the drum 2, the gap between the drum 2 and the roller 3 fluctuates, and the roller 3 freely rotates with the roller 3 biting into the consolidation layer. The synthetic resin piece 6 with the mud or sand adhered to the gap 7 of the roller 3 is
By rubbing each other and polishing and cutting the surface,
Mud or sand is separated from the synthetic resin pieces. The separated mud or sand and the synthetic resin pieces are discharged from the bottom 51 of the discharge port 5. The degree of polishing and cutting of this synthetic resin piece is determined by the drum 2
And the degree of eccentricity of the center of the rotation axis of the roller 3 can be adjusted.

The mixture of the separated mud or sand and the synthetic resin pieces is classified by a screen 8. That is, the mud or sand in the fine powder state passes through the eyes of the screen 8 and is discharged from the mud or sand discharge port 9. Since the separated synthetic resin pieces 6 are in a coarser state than the mud or sand, they pass through the screen 8. It is taken out from the synthetic resin piece discharge port 10 without performing.

As a method for classifying the mixture of the separated mud or sand and the synthetic resin pieces, a method other than the method using the screen 8 as described above can be adopted. For example,
As shown in FIG. 4, a method of separately classifying by a classifier 13 is employed. The mixture discharged from the bottom 51a of the discharge port of the polishing machine 1a is transported by the transport conveyor 14 to the classifier 1
Transport to 3.

The classifier 13 has an air inlet 131 provided on a lower side surface thereof, a bottom plate 123 provided with a slit 132 for blowing air, a dispersion plate 134 provided above the slit 133, and a fine powder outlet 135. And a container provided with a coarse powder outlet 136, and a vibrator 137 is provided outside the container, and the mixture is sent forward by the vibration.

The mixture transported to the classifier 13 is advanced forward by the vibration of the shaker 127, but enters the air inlet 121 and blows to the dispersion plate 134 by air blown out of the slit 132 of the bottom plate 123. Can be attached. The synthetic resin pieces in the mixture that collided with the dispersing plate 134 fall again to the bottom plate 133. However, mud and sand pulverized by the polishing machine 1a and a part of the synthetic resin which has been polished and cut into fine powder by the polishing machine 1a. Fine powder consisting of pieces etc. blows upward. This fine powder is discharged from a fine powder outlet 135 through a dust collector 138.
It is sucked and collected. The above-mentioned synthetic resin piece that has fallen again to the bottom plate 133 is advanced forward, and while receiving the same action repeatedly in the front slit portion, the coarse powder outlet 136 is discharged.
And is discharged outside. Coarse powder discharged from the coarse powder outlet 136 is composed of only synthetic resin pieces, excluding mud and sand, and some synthetic resin pieces which have been polished and cut into fine powder by the polishing machine 1a.

The degree of the above classification can be adjusted by changing the amount of blown air. Although the above fine powder is not particularly limited, it is usually preferable to set the length to 1 mm or less from the viewpoint of ease of separation, and coarse powder is not particularly limited.
Usually, it is preferable to set the length to 3 to 10 mm from the viewpoint of easy classification. Slit 132 of bottom plate 133
Is preferably about 3 mm.

Next, an example in which the apparatus shown in FIGS. 1 and 2 is used to treat a crushed piece of polyvinyl chloride or crushed polypropylene to which mud and sand are adhered will be described.

First, using the apparatus shown in FIGS. 1 and 2, an 8 mm long crushed piece of polyvinyl chloride 3 to which mud and sand are adhered.
0 kg was processed. In this case, the rotation speed of the roller 3 of the polishing machine 1 was set to 400 rpm, and the drum 2 and the roller 3 were rotated.
Is 12 mm, and the aperture of the screen 8 is 2 mm.
0 mesh (1 mm). As a result, 0.27 kg of fine powder was discharged from the mud and sand discharge port 10, and 29.72 kg of polyvinyl chloride crushed pieces to which mud and sand did not adhere were obtained from the synthetic resin piece discharge port 9. Recovery rate is 99.1
%Met.

In the same manner as above, 15 kg of 8 mm long polypropylene crushed pieces to which mud and sand were adhered were treated using the apparatus shown in FIGS. In this case, the rotation speed of the roller 3 of the polishing machine 1 is set to 450 rpm,
The minimum gap between the roller 3 and the screen 3 is 12 mm.
Was 20 mesh (1 mm). As a result,
0.11 kg of fine powder was discharged from the mud and sand discharge port 10, and 14.82 kg of polypropylene crushed pieces to which mud and sand did not adhere were obtained from the synthetic resin piece discharge port 9. The recovery rate was 99.3%.

Next, using the apparatus shown in FIG. 3, 30 kg of 8 mm long ground polyvinyl chloride particles to which mud and sand had adhered were treated. In this case, the number of revolutions of the roller 3a of the polishing machine was set to 400 rpm, the minimum gap between the drum and the roller 3a was 12 mm, and the aperture of the screen was 20 mesh (1 mm). As a result, the mud and sand discharge from the mud and sand outlets was reduced to 0.1 mm.
54 kg of fine powder was discharged, and 29.4 crushed pieces of polyvinyl chloride to which mud and sand did not adhere from the outlet of the synthetic resin piece.
6 kg were obtained. The recovery was 98.2%.

Further, using the apparatus shown in FIG. 3, 15 kg of 8 mm long polypropylene crushed pieces to which mud and sand adhered were treated. In this case, the rotation speed of the roller 3a of the polishing machine was set to 450 rpm, the minimum gap between the drum and the roller 3a was 12 mm, and the aperture of the screen was 20 mesh (1 mm). As a result, the mud and sand discharge from the mud and sand outlets was reduced to 0.1 mm.
22 kg of fine powder was discharged, and 14.7 pulverized polypropylene pieces having no mud and sand adhered through the synthetic resin piece discharge port.
8 kg were obtained. The recovery rate was 98.5%.

[0030]

The constitution of the method for regenerating a synthetic resin of the present invention is as follows.
As described above, without using a wet method, it is possible to separate the mud or sand and the synthetic resin pieces from the synthetic resin pieces to which the mud or sand is attached, so running costs and equipment costs are low, and the installation area is small. That's how it works. Therefore, it is a method that can be easily automated and can regenerate a large amount of synthetic resin at low cost, and its utility value is high.

The structure of the synthetic resin regenerating apparatus of the present invention is as described above, and separates mud or sand and synthetic resin pieces from mud or sand adhering synthetic resin pieces without using a wet method. Since classification can be performed, running costs and equipment costs are low, and the installation area is small. Therefore, automation is easy and a large amount of synthetic resin can be regenerated at low cost.

[0032]

[Brief description of the drawings]

FIG. 1 is a side view showing a mechanism of an example of a reproducing apparatus according to the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a side view showing a mechanism of another example of the reproducing apparatus of the present invention.

FIG. 4 is a schematic side view showing one means for separating a synthetic resin piece from a mixture of separated mud or sand and a synthetic resin piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Polisher 2 Drum 21 Center of rotation axis of drum 3, 3a Roller 31 Center of rotation axis of roller 4, 4a Input port 5 Discharge port 6 Synthetic resin piece to which mud or sand adhered 7 Gap 8 Screen 9 Synthetic resin piece Discharge port 10 Mud or mud discharge port 13 Classifier

Claims (2)

(57) [Claims] 1. A gap between a drum and a roller of a polishing machine in which a rotatable roller is provided in a rotatable drum, and the center of the rotation axis of the drum and the center of the rotation axis of the roller are parallel and eccentric. Then, a synthetic resin piece with mud or sand adhered thereto is supplied, and the synthetic resin pieces are rubbed against each other by rotation of a drum and a roller. A method for regenerating a synthetic resin, comprising: 2. A discharge port for a material to be polished of a polishing machine in which a rotatable roller is provided in a rotatable drum, and the center of rotation of the drum and the center of rotation of the roller are parallel and eccentric. A synthetic resin reproducing device, characterized in that a screen is provided in the section.