JP3060263B2 - PVC detector in waste plastic - Google Patents

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 plastic discarded as municipal waste or industrial waste, and more particularly to a polyvinyl chloride detection device for checking the presence or absence of polyvinyl chloride in waste plastic. .

[0002]

2. Description of the Related Art Conventionally, in the treatment of municipal solid waste and industrial waste, polyvinyl chloride waste is treated together with other types of plastic waste, and plastic waste is inspected. There was no equipment for separating and treating only polyvinyl chloride waste.

[0003]

However, when the polyvinyl chloride waste is treated together with other types of plastic waste, the collected plastic is recycled.
Since various types of plastics are mixed, the quality of recycled plastics deteriorates.In the case of incineration of collected plastics, hydrogen chloride gas is generated along with the incineration of the mixed polyvinyl chloride, and this causes incineration. It can cause damage and even cause pollution.

It is known that whether or not the plastic is made of polyvinyl chloride can be determined by checking for the presence or absence of HCl gas due to the thermal decomposition of the plastic. There was no.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the amount of polyvinyl chloride contained in waste plastic so that the waste can be separated and treated from other types of plastic waste. It is an object of the present invention to provide a PVC detector capable of reliably examining the presence or absence of vinyl chloride.

[0006]

SUMMARY OF THE INVENTION A device for detecting PVC in waste plastic according to the present invention has been devised to solve the above-mentioned problems, and comprises a light source that generates infrared or visible light and a light source that emits light. collected in a plastic, which includes a condenser system for thermally decomposed, and a suction device for collecting air containing pyrolysis gas discharge plastics, and HCl detector for detecting the HCl in the air, condensing system
A downward-pointing concave mirror located above the light source and a light source
And a convex lens arranged on the optical axis of the concave mirror below
The suction device is integrated with the convex lens
An enclosing wall covering the space below, and HC from one side of the upper end of the enclosing wall.
l The suction pipe provided to the detector and the inside of the HCl detector
It consists of an installed suction pump, a convex lens and an enclosure
The wall is made up and down freely .

[0007]

According to the apparatus for detecting PVC in waste plastic according to the present invention, infrared light or visible light emitted from the light source is locally collected by the light condensing system on the upper light condensing portion of the waste plastic, and the waste heat is collected by the collected heat energy. Is thermally decomposed. The air in the enclosure , including the pyrolysis gases of the waste plastic, is sent by a suction device to an HCl detector, which checks for the presence of HCl in the air.

Further , the optical axis of the concave mirror arranged below the light source
A convex lens is provided on the top so that it can move up and down.
There is no need to move the entire system.

[0009]

Next, an embodiment of the present invention will be described in order to specifically explain the present invention.

In the accompanying drawings, a light source for generating infrared rays
(1) is installed upward and connected to the power supply (5). Above the light source (1), a concave mirror (2a) is arranged downward. The light source (1) and the concave mirror (2a) are each fixed to a support. A concave mirror (2a) under the light source (1)
The convex lens (2b) is arranged on the optical axis of the optical system. Convex lens (2
The space below b) is enclosed by the enclosure wall (6), and a suction pipe (7) is provided from one side of the upper end of the enclosure wall (6) to the HCl detector (4), and is suctioned by the HCl detector (4). Pump (8) is built-in. Thus, a suction device (3) is constituted by the surrounding wall (6), the suction pipe (7) and the suction pump (8). Convex lens (2
b) is integrated with the enclosure wall (6) and is movable up and down so that the focus is on the waste plastic (P) to be inspected. The HCl detector (4) functions to check whether HCl is present in the air containing the pyrolysis gas of the waste plastic (P).

The waste plastic (P) is placed on a stationary conveyor (9) or a test pan.

In the above-structured PVC detection apparatus, HCl
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, the power supply (5) is turned on and the light source (1) emits infrared rays. Infrared light emitted from the light source (1) is reflected by the concave mirror (2a), roughly condensed by the convex lens (2b), and further converged by the convex lens (2b).
The light is focused on one point on the upper end surface of the waste plastic (P) by adjusting the height of the plastic. As a result, the condensing part of the waste plastic (P) is thermally decomposed locally by the condensing heat energy,
The air containing the generated pyrolysis gas is sent to the HCl detector (4) by the suction device (3). And the HCl detector
By (4), the presence or absence of HCl in the air is checked. H
If Cl is detected, polyvinyl chloride is contained in the waste plastic (P), and if HCl is not detected, polyvinyl chloride is not present in the waste plastic (P).

Even if the paper label is attached to the discharged plastic (P), the paper label can be burned at the same time as the thermal decomposition of the discharged plastic (P) by the above condensing energy. No pre-processing is required.

A fiber scope may be provided from the light source (1) to the waste plastic (P), and the light emitted from the light source may be guided to the waste plastic by the fiber scope.

[0015]

According to the PVC detector of the present invention, the light source
The condensed part of the waste plastic (P) is thermally decomposed locally by the condensed thermal energy of infrared or visible light emitted from (1) , and the air inside the enclosure (6) containing the generated pyrolysis gas is sucked. It is sent to the HCl detector (4) by the device (3) and the presence of HCl in the air is checked by the detector (4) to determine whether or not the waste plastic (P) contains polyvinyl chloride. Can be checked reliably. 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.

Since the convex lens (2b) is vertically movable on the optical axis of the concave mirror (2a) disposed under the light source (1), it is not necessary to move the entire light-collecting system.

[Brief description of the drawings]

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

[Description of Signs] (1)… Light source (2a)… concave mirror (2b)… convex lens (3)… suction device (4)… HCl detector

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-115761 (JP, A) JP-A-4-315955 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 31/12 G01N 33/44

Claims (1)

(57) [Claims] 1. A light source that generates infrared or visible light, a light-collecting system that collects light emitted from the light source in waste plastic and thermally decomposes the light, and a suction device that collects air containing pyrolysis gas from the waste plastic. HC in the air
; and a HCl detector for detecting l, condensing system, a downward concave surface disposed above the light source
A mirror and a convex arranged on the optical axis of the concave mirror under the light source
A suction device is integrated with the convex lens and is provided below the convex lens.
HCl is detected from the surrounding wall that covers the space and one side of the upper end of the surrounding wall
And a suction pipe installed in the HCl detector.
Of the convex lens and the surrounding wall
A PVC detector in plastic waste that can be moved up and down .