JPH063349A - PVC detector in waste plastic - Google Patents

Abstract

(57) [Summary] [Structure] A laser oscillator for generating a laser beam for thermally decomposing waste plastic, a suction device for collecting air containing pyrolysis gas of the waste plastic, and an HC in the air.
An apparatus for detecting polyvinyl chloride in waste plastics, which comprises an HCl detector for detecting l. [Effect] The laser light irradiation part of the waste plastic is thermally decomposed locally by the laser light energy, and the air containing the generated pyrolysis gas is sent to the HCl detector by the suction device, and the HCl in the air is detected by the detector. By checking the presence or absence, it is possible to reliably check whether or not polyvinyl chloride is contained in the waste plastic. Therefore, the PVC detection device according to the present invention is particularly useful for separating polyvinyl chloride waste from other types of plastic waste for treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the treatment of waste plastics discarded as municipal wastes and industrial wastes, and more particularly to a vinyl chloride detector for examining the presence or absence of polyvinyl chloride in waste plastics. .

[0002]

2. Description of the Related Art Conventionally, in the treatment of municipal waste and industrial waste, polyvinyl chloride waste is treated together with other types of plastic waste. There was no equipment to separate and treat only polyvinyl chloride waste.

[0003]

However, when the waste made of polyvinyl chloride is treated together with other kinds of plastic waste, when the recovered plastic is recycled,
Since many types of plastics are mixed, the quality of recycled plastics deteriorates, and when incinerating recovered plastics, hydrogen chloride gas is generated along with the incineration of mixed polyvinyl chloride, which causes the incinerator to burn. It will be damaged and even cause pollution.

It is known that it is possible to determine whether or not the plastic is made of polyvinyl chloride by checking whether or not HCl gas is generated by the thermal decomposition of the plastic. However, a suitable heat source for thermal decomposition is known. There was no

The present invention has been made in view of the above circumstances, and an object thereof is to remove polychlorinated vinyl chloride wastes from other types of plastic wastes so that the wastes can be treated in the waste plastics. It is an object of the present invention to provide a vinyl chloride detection device capable of reliably checking the presence or absence of vinyl chloride.

[0006]

An apparatus for detecting vinyl chloride in waste plastic according to the present invention has been devised to solve the above-mentioned problems, and includes a laser oscillator for generating a laser beam for thermally decomposing waste plastic, and a waste oscillator. It is provided with a suction device for collecting air containing plastic pyrolysis gas and an HCl detector for detecting HCl in the air.

A particularly preferable example of the device for detecting vinyl chloride in waste plastic according to the present invention includes a laser oscillator for generating a laser beam, a fiberscope for guiding the laser beam emitted from the oscillator to the waste plastic, and a pyrolysis gas of the waste plastic. It comprises a suction device for collecting air and an HCl detector for detecting HCl in the air.

The suction device is composed of a vertical cylindrical enclosure wall, a suction pipe arranged from the upper cone portion of the enclosure wall to the HCl detector, and a suction pump installed in the HCl detector. The height of the enclosure wall is adjustable. By adjusting the height of the enclosure wall, a wide range of detection operations can be performed.

Further, the lower end of the fiberscope is usually located slightly above the lower end edge of the enclosure wall inside the enclosure constituting the suction device, but this may also be adjustable in height. .

[0010]

According to the device for detecting PVC in waste plastic of the present invention, the laser beam emitted from the laser oscillator is locally guided to the upper light collecting portion of the waste plastic by the fiberscope, and a part of the waste plastic is irradiated with laser light energy. Is absorbed and pyrolyzed. The air containing the pyrolysis gas of the waste plastic is sent to the HCl detector by the suction device, and the presence or absence of HCl in the air is checked by the detector.

[0011]

EXAMPLES Examples of the present invention will be shown below to specifically explain the present invention.

In the accompanying drawings, a laser oscillator (1) for generating a laser beam is connected to an HCl detector (4) described later. The laser oscillator (1) is provided with a fiberscope (2) that guides the laser beam emitted from it into a vertical cylindrical enclosure wall (6). The fiberscope (2) is a guide (5) to the top cone (6a) of the enclosure wall (6).
And is inserted into the enclosure wall (6) through, and the lower end of the depending insertion portion is located slightly above the lower edge of the enclosure wall (6).

HCl from the upper cone portion (6a) of the enclosure wall (6)
The suction pipe (7) is installed to the detector (4) and the HCl detector
The suction pump (8) is built in (4). Thus, the suction device (3) is composed of the surrounding wall (6), the suction pipe (7) and the suction pump (8). The height of the enclosure wall (6) is adjustable on a column (not shown).

The HCl detector (4) is made of waste plastic (P).
It functions to check whether or not HCl is present in the air containing the pyrolysis gas.

The waste plastic (P) is placed on a conveyor (9) at rest or a test dish.

In the polyvinyl chloride detecting device having the above structure,
When the detector (4) is switched on, the suction pump (8)
Is activated, and the air in the enclosure wall (6) is sucked. At the same time, a command is sent to the laser oscillator (1) to emit a laser beam. The laser beam emitted from the laser oscillator (1) is discharged by the fiberscope (2) into plastic.
It is guided to a point on the upper end surface of (P). As a result, the laser light irradiation portion of the waste plastic absorbs the laser light energy and is thermally decomposed. The air containing the generated pyrolysis gas is sent to the HCl detector (4) by the suction device (3). Then, the presence or absence of HCl in the air is checked by the HCl detector (4). If HCl is detected, waste plastic
(P) contains polyvinyl chloride, and H
If no Cl is detected, there is no polyvinyl chloride in the waste plastic (P).

Even if a paper label is attached to the discharged plastic (P), the paper label can be burnt at the same time as the thermal decomposition of the discharged plastic (P) due to the laser light energy. No pre-treatment is required.

It is also possible to attach a switch to the lower end of the enclosure wall (6) constituting the suction device (3) so that the laser oscillator (1) is activated and the laser beam is emitted only when the switch is on. In this case, the safety of the device is increased.

[0019]

According to the PVC detecting device of the present invention, the light source
(1) The laser light energy of the laser beam emitted from (1) locally thermally decomposes the laser light irradiation part of the waste plastic (P), and the air containing the generated thermal decomposition gas is sucked in.
(3) sends to the HCl detector (4), and by checking for the presence of HCl in the air by the detector (4), it is confirmed whether or not polyvinyl chloride is contained in the waste plastic (P). You can look into. Therefore, the PVC detection device according to the present invention is particularly useful for separating polyvinyl chloride waste from other types of plastic waste for treatment. Also, by using a laser beam, the thermal decomposition of the plastic (P) can be quickly achieved,
The inspection time can be shortened.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus showing an embodiment of the present invention.

[Explanation of symbols]

 (1) ... laser oscillator (2) ... fiberscope (3) ... suction device (4) ... HCl detector

Claims (1)

[Claims] 1. A laser oscillator for generating a laser beam for thermally decomposing waste plastic, a suction device for collecting air containing pyrolysis gas of waste plastic, and an HCl detector for detecting HCl in the air. PVC detection device in waste plastics.