JP2004210832A - Recycling system of waste foamed synthetic resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recycling system of waste foamed synthetic resins, capable of performing treating works quickly, without causing deterioration of working environment with a solvent by installing a peculiar dissolving treatment constitution, also improving a recovery efficiency by using a peculiar conveying means and producing a high quality regenerated raw material. <P>SOLUTION: This device for the recycling system consists of a dissolving vessel containing a solvent sealed with water for dissolving the waste foamed synthetic resin by throwing it into the water-sealed solvent, a heating and separating device for separating a mixed solution obtained by dissolving the waste in the dissolving vessel to a resin portion and solvent portion, a solvent liquid tank for recovering and storing the separated solvent and a solidifying device for solidifying the separated resin portion. The method for recycling the waste foamed synthetic resin is characterized by heating the mixed solution of the waste foamed synthetic resin obtained by putting the waste into the solvent in the dissolving vessel and dissolving, in the heating and separating device to separate into the resin portion and solvent portion, storing the separated solvent in the solvent liquid tank for reuse, and also solidifying the separated resin portion in the solidifying device for reuse. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a recycling system for recycling waste synthetic resin products, and more particularly to a recycling system for dissolving a styrene resin product in an organic solvent to recover both the styrene synthetic resin and the solvent.
[0002]
[Prior art]
As a method of collecting and recycling used synthetic resin such as styrene foam, a method of dissolving the synthetic resin by heat and a method of recovering the synthetic resin by dissolving the synthetic resin in a solvent are being studied. .
[0003]
By the way, in the former method, since the resin is denatured by heating, a high-quality regenerated resin cannot be obtained. In the latter method, since generally used solvents are not recovered, there are problems such as high running cost and poor working environment due to evaporation of the solvents.
For example, conventionally, as a method of regenerating waste styrofoam, there has been known a solvent volume reduction method in which a solvent is dissolved in a solvent, separated, regenerated, and recycled. , Patent Document 2).
Also, an improved recycling method for plastic waste made of a styrene-based synthetic resin is disclosed (for example, see Patent Document 3).
[0004]
[Patent Document 1]
JP-A-7-26057 [Patent Document 2]
JP-A-7-62137 [Patent Document 3]
Japanese Patent No. 2819209 [0005]
[Problems to be solved by the invention]
However, the conventional solvent volume reduction method has the following disadvantages.
(1) Chlorinated hydrocarbons, which are harmful substances and whose use is prohibited as environmental pollutants, are used as the solvent.
(2) Poor practicality due to low dissolution rate.
(3) The main component of the solvent has a problem in safety such as ignition or ignition.
(4) The solvent has not been water-sealed.
(5) Filtration means for removing impurities is required.
Therefore, the present invention has been proposed to solve the above problems, the purpose of which is to provide a unique dissolution processing configuration, the dissolution speed is fast, there is no deterioration of the working environment due to the solvent, By using special transportation means, recovery efficiency can be improved, and high-quality recycled materials and recycled products can be provided. Furthermore, the plant configuration is compact, running costs are low as a whole, and work environment An object of the present invention is to provide a good waste foam synthetic resin recycling system.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a waste foam synthetic resin recycling system according to the present invention includes a dissolving tank in which a solvent is sealed by being filled with water, and the waste foamed synthetic resin is charged and dissolved in the water-sealed solvent. And a heating / separating device for separating the mixed solution dissolved in the dissolving tank into a resin component and a solvent component, a solvent liquid tank for collecting and storing the separated solvent, and solidifying the separated resin component. Solidification device,
The mixed solution of waste foamed synthetic resin put into and dissolved in the solvent in the dissolving tank is heated and separated by a heating and separating device into a resin component and a solvent component, and the separated solvent is stored in a solvent liquid tank and reused. In addition, the separated resin component is solidified in a solidifying device and reused.
Thus, the waste foamed synthetic resin is put into a water-sealed solvent and dissolved in a liquid state. Then, the mixed solution (solution) is separated into a resin component (styrene component) and a solvent component by a separator. Can be collected and reused. At this time, since the solvent is prevented from volatilizing in the water seal layer, the environment does not deteriorate.
[0007]
Further, the waste foaming synthetic resin recycling system of the present invention is provided with a mixed solution tank between the dissolving tank and the heating and separating device, and temporarily stores the mixed solution dissolved in the dissolving tank in the mixed solution tank. The mixed solution is introduced from the tank to the heat separation device.
Thus, the mixed solution of the waste foamed synthetic resin dissolved in the dissolving tank can be temporarily stored in the mixed solution tank.
[0008]
Further, in the recycling system for waste foamed synthetic resin of the present invention, the solvent contained in the dissolving tank is water-sealed as a lower layer with an upper water-sealing layer, and the lower solvent layer is formed in the dissolving tank. And a foreign matter removing means for removing foreign matter floating on the water sealing layer.
As a result, the waste foamed synthetic resin can be guided and dissolved in the solvent, and the mixed foreign matter can be easily removed.
[0009]
Further, the waste foam synthetic resin recycling system of the present invention is characterized in that the waste foam synthetic resin supply means is provided with a push screw rotatably provided in the cylindrical body reaching the solvent layer. And
Thereby, the waste foamed synthetic resin can be guided into the solvent layer by being guided by the pushing screw.
[0010]
Further, the waste foaming synthetic resin recycling system of the present invention is characterized in that the dissolving tank is provided with a trash container for collecting the foreign matter removed by the foreign matter removing means.
Thus, the removed foreign matter can be collected without polluting the environment.
[0011]
Further, in the waste foaming synthetic resin recycling system of the present invention, the heating / separating device is provided such that a screw is rotatably provided in a heating cylinder having an upper portion serving as a passage for a vaporized solvent. While the solution is supplied, kneaded with a screw while being heated and sent toward the outlet, the solvent is vaporized and discharged to the solvent liquid tank through the passage, and the resin component is discharged from the outlet. .
Thereby, it can be easily separated into a resin component and a solvent component.
[0012]
Further, the waste foam synthetic resin recycling system according to the present invention is characterized in that the solidifying device includes an extruder, a cooling means, and a cutting machine.
Thus, the resin component can be extruded into a filament by an extruder, cooled, and then cut into pellets.
[0013]
Further, the waste foam synthetic resin recycling system according to the present invention is characterized in that the dissolving tank is mounted on a traveling body, and the waste foam synthetic resin is put into the dissolving tank at a disposal place, and is dissolved and collected.
As a result, the waste foamed synthetic resin can be collected at a disposal place with a reduced volume.
[0014]
Further, the recycling system for waste foamed synthetic resin according to the present invention is characterized in that the solvent is a solvent for waste foamed styrene-based synthetic resin comprising 60% of normal propyl bromide, 35% of propylene carbonate, 5% of stabilizer and the like. .
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an overall explanatory view showing a recycling system of the present invention.
The recycling system shown in FIG. 1 includes a dissolving tank 1 in which a solvent is sealed in a water bath and a waste foamed synthetic resin (hereinafter, simply referred to as a foamed resin) is injected into the water-sealed solvent and dissolved therein. A mixed solution tank 11 for storing the mixed solution dissolved in the dissolving tank 1, a heating separation device 12 for separating the mixed solution in the mixed solution tank 11 into a resin component and a solvent component, and separation by the heating separation device 12. A solvent solution tank 23 for collecting and storing the separated solvent, and a solidifying device 16 for solidifying the separated resin component, which is roughly composed of a mixed solution of the foamed resin dissolved in the solvent in the dissolving tank 1 Is temporarily stored in the mixed solution tank 11 and then injected into the heating / separating device 12 to be separated into a resin component and a solvent component. The separated solvent is collected in the solution tank 23, reused and separated. The solidified resin is separated into Be re-used is solidified to move.
[0016]
FIG. 2 is an enlarged schematic explanatory view of the dissolving tank. As shown in FIG. 2, the solvent contained in the dissolving tank 1 becomes a lower layer A and is water-sealed by an upper water-sealing layer B. This prevents the solvent from inadvertently evaporating.
The solvent can be used as long as it can dissolve styrene and has a specific gravity greater than that of water.However, it is not preferable that the solvent destroys the environment or pollutes it. A solvent composed of 60% of propyl bromide, 35% of propylene carbonate, 5% of a stabilizer and the like was used.
[0017]
The dissolving tank 1 is provided with a foamed resin supply means 3 for guiding into the lower solvent layer A and a foreign matter removing means 28 for removing foreign matter floating on the interface of the water seal layer B. In the supply means 3 of this example, a screw 5 is rotatably provided in a cylindrical body 4 and is rotated by a motor (not shown). As shown in FIG. 2, the foamed resin conveyed on the conveyor 2 is fed into the supply means 3 by a rotating roller 6 having blades, guided by the rotating screw 5 into the solvent layer A, and dissolved. It is preferable that the foamed resin to be charged is pulverized and charged.
[0018]
The foreign matter removing means 28 removes foreign matters (foreign matter) such as labels floating on the interface of the water sealing layer B, and is constituted by a removing pipe having screw blades. This may be a suction type. A waste container 8 for collecting the removed foreign matter is provided at an outlet of the foreign matter removing means 28.
[0019]
In addition, a discharge path 10 for discharging a volatile solvent to an incinerator (not shown) is provided with a blower 9 at an upper portion of the dissolving tank 1. That is, the air in the bubbles in the foamed resin rises in the solvent layer A, fills the cover on the dissolving tank 1 via the water seal layer B, and can flow out into the discharge path 10. The air in 10 is fed into a combustor (not shown) by a blower 9, and the burner of the combustor can burn off and remove the solvent and the like contained in the air. The incinerated gas was sent through a discharge pipe connected to the combustion cylinder and further into a neutralization tank (not shown) to neutralize harmful vaporized components in the combustion gas and stored in the tank. As well as being dissolved in water, it can be cooled and released as harmless air near normal temperature from the chimney (not shown) to the atmosphere.
[0020]
A discharge pipe 7 provided with a pump P3 is connected between the lower side surface of the dissolving tank 1 and the mixed solution tank 11, and the mixed solution of the foamed resin dissolved in the dissolving tank 1 is discharged to the mixed solution tank 11. Are stored. A pipe provided with a pump P ₁ is provided below the mixed solution tank 11, and is connected to the heat separation device 12.
[0021]
The heating / separating apparatus 12 has a screw 13 rotatably provided in a heating cylinder 12a having an upper portion serving as a passage 14 for a vaporized solvent, and is supplied from the mixed solution tank 11 to the heating cylinder 12a via a supply port. The heated mixed solution is kneaded by the screw 13 while being heated, and is sent toward the outlet. During this time, the solvent component of the mixed solution is vaporized and collected in the solution tank 23 through the discharge portion 15 through the passage 14, and the resin component is discharged to the solidification device 16 from the outlet. The discharge unit 15 is provided with a cooling means, and cools the solvent that has been vaporized and discharged, returns the liquid to a liquid state, and collects it in the solution tank 23.
[0022]
The solidifying device 16 includes an extruder 17, a cooling unit 18, a draining unit 19, and a cutting machine 20. The resin component separated and discharged by the heating separation device 12 is extruded into a linear body while being heated by an extruder 17, and the extruded resin component is cooled by a cooling unit 18 and drained by a draining unit 19. After that, it is cut by the cutting machine 20 and pelletized. The pellets cut by the cutter 20 are separated by a pellet sorter 21 and collected in a catcher tank 22. FIG. 3 is a partially enlarged explanatory view of the solidifying device.
[0023]
FIG. 4 is a modification showing the supply means of the dissolving tank, and the same elements as those in the above embodiment are denoted by the same reference numerals and detailed description thereof will be omitted. According to this example, the foamed resin is reliably supplied into the solvent layer A.
Reference numeral 24 denotes a heating unit for supplying a heat medium to the heating / separating device 12, for example, a boiler; 25, a water-cooled chiller as a cooling unit for the exhaust unit 15; and 26, a cleaning tower for purifying exhaust gas.
[0024]
Further, in the present invention, the dissolving tank 1 may be mounted on the traveling body (tank lorry) 27, and the foamed resin may be introduced into the dissolving tank 1 at a disposal place or a collecting place to be dissolved and collected. For example, while collecting used polystyrene foam used as containers for fresh fish and fruits and vegetables, packaging materials for home appliances and OA equipment, cushioning materials, etc., from small supermarkets and home appliance stores where there is not enough room, It has a function of dissolving the recovered styrofoam with a solvent during transportation and supplying this resin solution to the mixed solution tank 11.
Since the two-component mixed solvent used in this embodiment has a vaporization temperature of about 66 ° C., it can be processed at a low distillation separation temperature of 100 ° C. or less, and the solvent itself has an ignition point of 660 ° C. Therefore, it is possible to avoid inconveniences such as a fire accident in normal work.
[0025]
The tank lorry 27 can of course be filled and transported with a new virgin solvent separately from the regenerated solvent as a supply and transport means, and can be similarly supplied into the dissolving layer 1.
In particular, when repeatedly used, the amount used gradually decreases due to the loss during the transfer of the solvent itself and the loss due to vaporization, so if the weight loss state is reached or if there is a risk of weight loss, a new It is necessary to replenish the necessary virgin solvent according to the shortage.
Furthermore, the mixing ratio of the volume of water and the solvent is preferably about 7: 3, whereby the odor can be sealed with water, so that it can be carried out without hindering practical use.
[0026]
Here, examples of the waste foam synthetic resin include a waste styrene foam, a waste ABS resin, a waste foam AS resin, and the like.
The above embodiment does not limit the present invention, and various modifications are allowed without departing from the gist of the present invention. For example, the mixed solution tank 11 is not always necessary, and the mixed solution tank 11 may be directly introduced from the dissolving tank 1 to the heat separation device 12.
[0027]
【The invention's effect】
As described in detail above, according to the waste foam synthetic resin recycling system of the present invention, the following effects can be obtained.
(1) The waste foamed synthetic resin is introduced into a water-sealed solvent and dissolved in a liquid state, and then the mixed solution (solution) is separated into a resin component (styrene component) and a solvent component by a separator. Can be collected and reused. At this time, since the solvent is prevented from volatilizing in the water seal layer, the environment does not deteriorate.
(2) The processing operation is easy and can be performed in a short time, and the running cost is low.
(3) High quality recycled materials and recycled products can be provided.
(4) The working environment is not deteriorated.
[0028]
(5) The waste foamed synthetic resin is reliably dissolved by being guided in the solvent layer, and has a high dissolution rate.
(6) Foreign matter is removed, foreign matter is easily removed, and another filtering device is not required.
[0029]
(7) Foreign matter is collected in a garbage container and can be treated by another carbonization device.
(8) Synthetic resin can be recovered effectively and without denaturation of the resin.
(9) The collection efficiency of the waste foamed synthetic resin can be improved by using a special transportation means.
[Brief description of the drawings]
FIG. 1 is an overall explanatory diagram of a recycling system showing an embodiment of the present invention.
FIG. 2 is an enlarged explanatory view of a melting tank.
FIG. 3 is a partially enlarged explanatory view of a solidifying device.
FIG. 4 is an enlarged explanatory view showing a modification of the melting tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dissolution tank 3 Supply means 4 Cylinder 5 Screw 11 Mixed solution tank 12 Heat separation device 12a Heating cylinder 13 Screw 14 Passage 16 Solidification device 17 Extruder 18 Cooling means 20 Cutting machine 23 Solvent liquid tank 27 Running body 28 Foreign material removing means A Lower layer (Solvent layer)
B Upper layer (water sealing layer)

Claims (9)

A solvent is filled in with a water seal, and a dissolving tank for dissolving the foamed synthetic resin by throwing it into the water-sealed solvent, and the mixed solution dissolved in the dissolving tank is converted into a resin component and a solvent component. It consists of a heat separation device for separating, a solvent liquid tank for collecting and storing the separated solvent, and a solidifying device for solidifying the separated resin component,
The mixed solution of waste foamed synthetic resin put into and dissolved in the solvent in the dissolving tank is heated and separated by a heating and separating device into a resin component and a solvent component, and the separated solvent is stored in a solvent liquid tank and reused. A recycling system for waste foamed synthetic resin, wherein the separated resin component is solidified in a solidifying device and reused. A mixed solution tank is provided between the dissolving tank and the heat separation device, the mixed solution dissolved in the dissolution tank is temporarily stored in the mixed solution tank, and the mixed solution is introduced from the mixed solution tank to the heat separation device. The recycling system for waste foamed synthetic resin according to claim 1. The solvent contained in the dissolving tank is water-sealed as a lower layer with an upper water-sealing layer. 3. A recycling system according to claim 1, further comprising a foreign matter removing means for removing foreign matter floating on the surface. The waste foam synthetic resin recycling system according to claim 3, wherein the waste foam synthetic resin supply means is provided with a push screw rotatably provided in the cylinder so as to reach the solvent layer. . The recycling system for waste foamed synthetic resin according to claim 3, wherein a trash container for collecting the foreign matter removed by the foreign matter removing means is provided in the melting tank. The heating / separating apparatus is provided with a screw rotatable in a heating cylinder whose upper portion is a passage for a vaporized solvent, and the mixed solution is supplied into the heating cylinder, kneaded by the screw while being heated, and exited. The waste foam synthesis according to any one of claims 1 to 5, wherein the solvent is vaporized and discharged to the solvent liquid tank through the passage while being sent in the direction, and the resin component is discharged from the outlet. Resin recycling system. 7. The recycling system for waste foamed synthetic resin according to claim 1, wherein the solidifying device includes an extruder, a cooling unit, and a cutter. The waste foamed synthetic resin according to any one of claims 1 to 7, wherein the dissolving tank is mounted on a traveling body, and the waste foamed synthetic resin is put into the dissolving tank at a disposal place, and is dissolved and collected. Recycling system. The waste foam according to any one of claims 1 to 8, wherein the solvent is a solvent for waste foamed styrene-based synthetic resin comprising 60% of normal propyl bromide, 35% of propylene carbonate, and 5% of a stabilizer and the like. Synthetic resin recycling system.

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