JPH063347A - PVC detector in waste plastic - Google Patents

Abstract

(57) [Summary] [Purpose] The presence or absence of polyvinyl chloride in waste plastics can be reliably investigated in a short time so that polyvinyl chloride wastes can be separated and treated from other types of plastic wastes. Provided is a PVC detection device. A drainage comprising a vertical cylindrical enclosure wall having a suction pipe at an upper end, a heating element arranged in the enclosure wall, and an HCl detection sensor arranged on a suction path in the enclosure wall. It is a device for detecting PVC in plastic.

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 judge 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. In the method of sucking up to the detector through the sampling pipe and checking for the presence of HCl here, since the pyrolysis gas passes through the sampling pipe, there is a time lag between gas generation and detection, and the pyrolysis gas flows inside the sampling pipe. There is a problem that the sensitivity is lowered due to diffusion.

The present invention has been made in view of the above circumstances, and an object thereof is to remove wastes made of polyvinyl chloride from waste plastics so that wastes made of polyvinyl chloride can be separately treated from wastes of other kinds of 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 in a short time.

[0006]

A device for detecting PVC in waste plastic according to the present invention is devised to solve the above-mentioned problems, and has a vertical cylindrical enclosure wall having a suction pipe at its upper end. A heating element disposed inside the enclosure wall and an HCl detection sensor disposed on the suction path inside the enclosure wall.

A suction device is composed of a suction pipe arranged at the upper end cone portion of the surrounding wall and a suction pump provided at the tip of the suction pipe. The enclosure wall or heating element is preferably adjustable in height. By adjusting the height of the enclosure wall, a wide range of detection operations can be performed.

As the heating element, an electric heater, a laser device, an infrared condenser heater or the like can be used.

[0009]

According to the device for detecting PVC in waste plastic of the present invention, when the lower end of the heating element comes into contact with the waste plastic,
The contact point is pyrolyzed, and the presence or absence of HCl in the pyrolysis gas is checked by the HCl detection sensor on the suction path.

[0010]

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

In the attached drawings, a device for detecting vinyl chloride in waste plastic according to the present invention has a suction pipe (1) at its upper end.
A vertical cylindrical enclosure wall (2) with a vertical rod-shaped heating element (3) arranged in the enclosure wall (2), and an HCl detection sensor arranged on the suction path in the enclosure wall (2) (4) is provided.

From the suction pipe (1) arranged in the center of the upper cone portion (2a) of the enclosure wall (2) and the suction pump (5) provided at the tip of the suction pipe (1), a suction device (6 ) Is configured. The enclosure wall (2) is attached to a column (not shown) so that its height can be adjusted.

Inside the upper cone portion (2a) of the enclosure wall (2), one side of the suction pipe opening portion is provided with a pendant straightening plate.
(7) is provided so as to partition the inside of the upper cone portion (2a). In the enclosure wall (2), the heating element (3) is on one side of the rectifying plate (7) and the HCl detection sensor is on the other side.
(4) are arranged respectively. Therefore, the HCl detection sensor (4) is located on the suction path in the surrounding wall (2). The heating element (3) is fixed to the enclosure wall (2) and connected to the power supply (10).

The HCl detection sensor (4) is made of waste plastic.
It works to check whether or not HCl is present in the air containing the pyrolysis gas of (P). The detected value is recorded in the recorder (8).

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,
Switch on the detection sensor (4) and turn on the suction pump.
(8) is activated and the air in the enclosure wall (2) is sucked. At the same time, the power supply (10) is turned on and the heating element (3) is heated to the required temperature. When the enclosure wall (2) descends, the lower end of the heating element (3) contacts the waste plastic (P). As a result, the contact point of the waste plastic is thermally decomposed. The air containing the generated pyrolysis gas is sucked by the suction device (6), and the presence or absence of HCl in the air is checked by the HCl detection sensor (4) on the suction path. If HCl is detected, it means that polyvinyl chloride is contained in the waste plastic (P), and if HCl is not detected, there is no polyvinyl chloride in the waste plastic (P).

[0017]

According to the device for detecting PVC in waste plastic of the present invention, the lower end of the heating element (3) is the waste plastic (P).
When it contacts with, the contact point is thermally decomposed and H on the suction path
The presence or absence of HCl in the pyrolysis gas is checked by the Cl detection sensor (4). Thus, by checking the presence of HCl in the air with the detection sensor (4), the waste plastic
It is possible to reliably check whether or not polyvinyl chloride is contained in (P). Therefore, the PVC detection device according to the present invention is particularly useful for separating and treating polyvinyl chloride waste from other types of plastic waste.

Further, the HCl detection sensor (4) is attached to the enclosure wall (2).
Since it is installed inside, there is no time lag as in the case of using a sampling pipe, and there is no fear of sensitivity deterioration due to diffusion of pyrolysis gas in the sampling pipe.

[Brief description of drawings]

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

[Explanation of symbols]

 (1)… Suction pipe (2)… Enclosure wall (3)… Heating element (4)… HCl detection sensor

Claims (1)

[Claims] 1. A vertical cylindrical enclosure wall having a suction pipe at an upper end thereof, a heating element arranged in the enclosure wall, and an HCl detection sensor arranged on a suction path in the enclosure wall. PVC detection device for waste plastics.