JPH11918A - Recovering method of waste plastic stock from vinyl chloride-based resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the recovering method of waste plastic stocks from vinyl chloride-based resin pipes, by which sludges can be separated from the vinyl chloride-based resin pipes, onto which the sludges adhere, without washing for recovering waste plastic stocks. SOLUTION: A vinyl chloride-based resin pipe 1, on which sludge under dry state adheres, is fed to a granulator 12 so as to granulate a resin to a size, which is larger than that of the sludge powder under the condition that the sludge is powdered, resulting in obtaining granulated articles 2 mixed with the sludge powder. By feeding the granulated articles mixed with the sludge powder to a dry screen classifier 17 equipped with a screen having openings, through which the sludge powder pass and the granulated article does not pass, the granulated articles 4, from which the sludge powder is removed, are obtained. Finally, by pulverizing the granulated articles 4 in a pulverizer 18, waste plastic stocks are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering waste plastic raw material from a vinyl chloride resin tube.

[0002]

2. Description of the Related Art At the present time, vinyl chloride resin pipe residue generated during plumbing work is disposed of by collecting waste plastic raw materials, entrusting disposal to an industrial waste disposal company, incinerating or burying by a construction company. ing. According to the "Research Committee of 1993 PVC Residual Materials (Summary)" of the Recycling Committee of the PVC Pipe and Fittings Association, the estimated annual construction residual material amount is estimated to be approximately 1 to 15,000 tons. ing. Of these, the recyclable amount is estimated to be about 30%.

Conventionally, as a method of recovering waste plastic raw materials from the residual material of vinyl chloride resin pipes, the residual material to which sludge such as sand and soil is adhered is separated and collected for each resin type, and the collected material is subjected to a coarse pulverizer. After crushing to obtain a coarsely crushed product mixed with sludge and washing it to separate the sludge by wet process,
It was dried and re-pelletized to obtain a waste plastic raw material.

However, in the case of such a conventional method, since the washing and drying steps are involved, the steps are complicated, the productivity is low, the cost is high, and there is little merit to use as a recovered raw material. There is a problem.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to separate sludge from a vinyl chloride resin pipe to which sludge is adhered without washing without waste. Plastic materials can be recovered,
An object of the present invention is to provide a method for recovering a waste plastic raw material of a vinyl chloride resin tube.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a vinyl chloride resin tube to which dry sludge has adhered is passed through a coarse pulverizer.
A step of coarsely pulverizing the resin to a size larger than the sludge powder while pulverizing the sludge to obtain a coarsely pulverized product in which the sludge powder is mixed. A coarse-pulverized product from which sludge powder has been removed by passing through a screener with a screen having an aperture through which the product does not pass, and a step of finely pulverizing the coarse-pulverized product with a fine pulverizer to obtain a waste plastic raw material. This is a method for recovering waste plastic raw materials from vinyl chloride resin tubes.

In the present invention, examples of the vinyl chloride resin forming the vinyl chloride resin tube include a homopolymer of vinyl chloride and a copolymer of a monomer copolymerizable with vinyl chloride.

[0008] In the present invention, the screener dry separation device includes, for example, a cylindrical screen having predetermined openings and radial blades rotating at a high speed on the center line thereof. What is blown and agitated, a finer than the screen is passed out of the cylindrical screen, and a coarser is discharged from the outlet side of the cylindrical screen without passing through the screen.

[0009] The screen of the screener dry separation apparatus used in the present invention must be provided with an aperture screen through which the sludge powder passes and the coarsely crushed product does not pass.

[0010] In the present invention, for example, when the rotor is rotated at a high speed, a strong vortex and pressure vibration are generated in the machine, and the raw material sucked into the swirl chamber from the feed port together with the air is converted into a strong air. A material that is instantaneously pulverized by a vortex and discharged together with air from a vortex chamber outlet is used.

[0011]

According to the method for recovering waste plastic raw materials from a vinyl chloride resin pipe of the present invention, the resin is separated from the sludge powder while the sludge is powdered while the dried polyvinyl chloride resin pipe is passed through a coarse crusher to pulverize the sludge. A step of obtaining a coarsely crushed product mixed with sludge powder by coarsely pulverizing to a large size, equipped with a screen of a size through which the sludge powder passes and the coarsely crushed product does not pass through the coarsely crushed product mixed with sludge powder. A process of obtaining a coarsely pulverized product from which sludge powder has been removed through a screener dry separation device,
It consists of a process to obtain a waste plastic raw material by finely pulverizing the coarsely pulverized product with a fine pulverizer, thereby separating the sludge from the vinyl chloride resin pipe to which the sludge is attached, without going through the washing and drying steps as in the past. Thus, waste plastic raw materials can be recovered in a continuous process with high productivity.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view for sequentially explaining the steps of an example of the method for recovering waste plastic raw materials from a vinyl chloride resin tube according to the present invention.

First, in the first step, the vinyl chloride resin tube 1 to which dry sludge such as sand or soil adheres is put into the raw material supply device 11 and the cover is closed.
And sent to the coarse crusher 12 at a speed of, for example, 1 m / min. The coarse pulverizer 12 has, for example, five rotors with two rotary blades, a large number of rotary blades 121 which are axially coupled with a phase difference of 60 °, and has a main shaft of a standard 300 rpm.
m. While the sludge is adhered to the polyvinyl chloride-based resin tube 1, the sludge is powdered by the impact of the rotary blade 121, and the resin is made to have a size larger than the sludge powder, for example, 8.
The resultant is coarsely pulverized to a square of mm to obtain a coarsely pulverized product 2 mixed with sludge powder.

In the next step, the coarsely pulverized product 2 into which the sludge powder is mixed is fed to a screw feeder 13, an inclined screw feeder 14, a hopper 15, an electromagnetic feeder 16 and the like.
After that, it is supplied to the screener dry separation device 17. The screener dry separator 17 has a cylindrical screen 171 having a size such that sludge powder passes therethrough and coarse crushed product does not pass therethrough, for example, a cylindrical screen 171 having an opening of about 1 mm, a screw 172 rotating therein, and three radial blades (not shown). It has.

The coarsely crushed product 2 mixed with the sludge powder is passed through a screener dry separator 17 to remove the sludge powder 3 by dropping it from the cylindrical screen 171, and the coarsely crushed product 4 is discharged from the cylindrical screen 171 outlet. .

In the next step, the obtained coarsely pulverized product 4 is pulverized together with air into a fine pulverizer 18 in which, for example, four rotors each having 28 blades rotate at 4,500 rpm.
And is finely pulverized by vigorous pulverizing action in the fine pulverizer 18 to form a finely pulverized product having a diameter of 1.2 mm or less and 95%.

The finely pulverized product is sent to the cyclone 19 through a pipe together with air to separate the air and the finely pulverized product, the finely pulverized product 5 is taken out from the lower part of the cyclone 19, and the waste plastic raw material is collected. . The air is filtered from the upper part of the cyclone 19 through the duct by the back filter 21 and released to the atmosphere.

[0018]

As described above, the method for recovering waste plastic raw material from a vinyl chloride resin pipe according to the present invention is as described above, so that the sludge is separated from the vinyl chloride resin pipe to which the sludge adheres without washing. As a result, the waste plastic raw material can be recovered, the number of processes is small, the productivity is good, the cost is low, and the merit of using as a recovered raw material is great.

[Brief description of the drawings]

FIG. 1 is a front view for sequentially explaining steps of an example of a method for recovering a waste plastic raw material from a vinyl chloride resin tube according to the present invention.

FIG. 2 is a perspective view illustrating, in a second step of the present invention, a step of subjecting a coarsely pulverized product mixed with sludge powder to a screener dry separation device to remove sludge powder and obtaining a coarsely pulverized product from a screen outlet. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vinyl chloride resin pipe 2 Coarse crushed product mixed with sludge powder 3 Sludge powder 4 Coarse crushed product 5 Fine crushed product 12 Coarse crusher 17 Screener dry separation device 18 Fine crusher 171 Cylindrical screen

Claims (1)

[Claims] Claims: 1. A vinyl chloride resin tube to which dry sludge has adhered is passed through a coarse pulverizer to coarsely pulverize the resin to a size larger than the sludge powder while pulverizing the sludge. The step of obtaining a crushed product, the coarsely crushed product mixed with the sludge powder is passed through a screener dry separation device having an aperture screen through which the sludge powder passes but the coarse crushed product does not pass. A method for collecting waste plastic raw materials for vinyl chloride resin pipes, comprising: a step of obtaining a raw plastic material by finely pulverizing a coarsely pulverized product with a fine pulverizer.