JP4022092B2 - Heat reduction device for foamed resin moldings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating volume reduction device for heating and reducing the volume of a foamed resin molded body.
[0002]
[Prior art]
Foamed resin moldings are used in large quantities as various packaging materials, and most of them are discharged as industrial waste. In recent years, industrial waste has become a social problem, and it is required to efficiently recycle these foamed resin moldings. If foamed resin moldings are used as lightweight building materials, the foamed resin moldings are required. It is possible to achieve both of the purposes of reusing the molded body and providing an inexpensive lightweight building material. Hereinafter, as these foamed resin molded articles, expanded polystyrene (so-called expanded polystyrene, hereinafter referred to as “EPS”) will be described as an example.
[0003]
EPS has a very small apparent specific gravity because its use is specialized in packing materials and cushioning materials at the time of packing. Conventionally, since EPS is mainly used as a raw material for recycled styrene resin, volume has been reduced to reduce transportation costs, and the following methods are typical as volume reduction methods for that purpose. .
The first method is a method in which EPS is completely melted by heating to form a lump. However, this method has a problem that the molecular weight of the recycled product is reduced because part of the molecular structure is destroyed by heating the EPS.
[0004]
The second method is a method in which EPS is dissolved in citrus oil such as limonene, and EPS is fractionated from this dissolved substance. However, the second method for performing the dissolution treatment has problems such as an increase in the size of the distillation equipment, an enormous manufacturing cost, and low energy efficiency.
[0005]
As is well known, EPS is a substance obtained by foaming polystyrene so that its volume is about 30 to 100 times, and its apparent specific gravity is about 0.01 to 0.03. Each of the volume reduction methods has the purpose of reducing the volume as much as possible in a short time, and thus the volume of EPS is apparently reduced to about 1.
On the other hand, when EPS is used for various lightweight building materials, EPS whose apparent specific gravity is reduced to about 0.05 to 0.7 (hereinafter referred to as “volume-reduced EPS”) is selectively used according to the type of lightweight building material. Because of the necessity, the above methods could not be used directly.
[0006]
Therefore, as a method for improving the above-mentioned problems, granular EPS (hereinafter referred to as “EPS granular material”) is placed in a thin layer (about 4 cm) on a conveyor and heated by a far-infrared heater to reduce the problem. A way to meet this has been proposed.
[0007]
[Problems to be solved by the invention]
However, in the method using the far infrared rays, the temperature changes depending on the absorption rate of the far infrared rays, so that the ambient temperature around the EPS granular material cannot be controlled, and the heating temperature cannot be managed uniformly. In addition, the EPS granular material on the surface portion directly irradiated with far infrared rays can be melted to a specific gravity to some extent by adjusting the speed of the conveyor, but the EPS granular material in the lower layer portion that is not directly irradiated with far infrared rays. May not be reduced and the apparent specific gravity may remain unchanged at the time of input. Therefore, a reduced volume EPS having a non-uniform apparent specific gravity will be manufactured, and the variation in the quality of the reduced volume EPS will increase. Therefore, establishment of a more uniform recycled product manufacturing method is desired.
Furthermore, in order to level the heating temperature to some extent, it is necessary to laminate the EPS granular material very thinly, but in this case, the amount of processing becomes extremely small, which is not suitable for practical use.
[0008]
Accordingly, the present invention has been made to solve the above problems, and provides a heating and volume reducing device for a foamed resin molded body that uniformly cures the entire foamed resin molded body and that uniformly increases the apparent specific gravity. The issue is to provide.
[0009]
[Means for Solving the Problems]
The present invention is configured to solve the above-mentioned problems, and the invention according to claim 1 is directed to a foamed resin in a heat-reducing apparatus (hereinafter referred to as “heat-reducing apparatus”) for a foamed resin molded body. An apparatus main body having a horizontally long hollow part for floating the granular material of the molded body, a hot air supply means for supplying hot air into the hollow part, an exhaust means for the hot air supplied into the hollow part, and a length of the hollow part Stirring means for the granular material of the foamed resin molding that is rotatably supported around the shaft, and decompression means capable of decompressing the inside of the hollow part while the hot air supply means is supplying hot air into the hollow part. The hot air supply means is configured to suck the hot air in the exhaust means and supply the hot air into the hollow portion, and the decompression means, when the granular material of the foamed resin molding is put into the hollow portion, the hollow portion is characterized in that it is configured to reduced pressure There.
[0010]
According to this invention, hot air is supplied to the hollow portion in the apparatus main body, and the granular material of the foamable resin molded body is suspended in the hollow portion by the hot air, and further, the granules of the foamable resin molded body are rotated by the rotation of each blade. By uniformly heating with hot air while rotating and stirring the product, the entire granular product of the foamed resin molded product can be uniformly cured, the apparent specific gravity can be increased uniformly, and the volume of the foamed resin molded product can be reduced. .
In addition, the stirrer forcibly rotates and stirs the granular material of the foamed resin molded body in a floating state and assists the floating of the granular material of the foamed resin molded body, so that the amount of hot air is reduced. Smooth and good volume reduction can be made possible.
Furthermore, when the granular material of the foamed resin molding is put into the hollow part, the suction action is generated in the hollow part by depressurizing the inside of the hollow part. it can.
[0011]
Here, the shape of the stirring means is not limited, and any shape that can rotate and stir the particles of the foamed resin molded body in a floating state may be used. For example, when rotating around the major axis, the wings for gathering formed so as to aggregate the particulates of the foamed resin molding in the hollow part, and foaming in the hollow part when rotated around the major axis It is composed of diffusion wings formed so as to diffuse the granular material of the resin molded body, the collection wings and the diffusion wings are installed in concentric positions, and the collection wings are formed around the diffusion wings. You may comprise. In this configuration, the gathering wing is formed around the diffusion wing installed at the concentric position, and the particulate matter of the foamed resin molded body accumulated on the bottom surface in the hollow portion after the volume reduction becomes the diffusion wing. Since they are gathered on the bottom surface by the gathering wings without coming into contact with each other, they can be easily and quickly removed from the hollow portion.
[0012]
Furthermore, by forming the collecting wing and the diffusion wing in a spiral shape, the granular material of the foamed resin molded body in the hollow portion is efficiently rotated and stirred, so that a good volume reduction can be achieved.
[0013]
According to a second aspect of the present invention, in the heating and volume reducing device according to the first aspect, the exhaust means sucks hot air into the exhaust means via the filtration means of the hot air formed in the hollow and the filtration means. a suction means is a venturi tube for, and a pressurizing means for pressurizing the inside of the filtration means, the filtration means by the pressure of the pressing means is characterized by being configured to expand.
[0014]
According to the present invention, even when particulates of the foamed resin molded body before and after volume reduction contained in the hot air adhere to the surface portion of the filtering means, the filtering means is expanded and the surface portion is vibrated. As a result, deposits on the surface portion are removed, so that the exhaust of hot air can be prevented from being inhibited, and the filter member is automatically cleaned, so that the maintainability can be improved.
[0015]
The invention according to claim 3 is the heating volume reduction device according to claim 1 or claim 2, wherein the device main body is provided with supply means for quantitatively supplying the granular material of the foamed resin molding into the hollow portion. It is characterized by having.
[0016]
According to the present invention, the volume of the foamed resin molded body that can be smoothly and satisfactorily reduced in volume in the hollow portion is automatically supplied, so that the working efficiency in volume reduction of the foamed resin molded body can be increased. .
[0017]
According to a fourth aspect of the present invention, the hot air supply means according to any one of the first to third aspects includes a hot air supply source and a plurality of supply ports, and extends into the hollow portion. And a hot air supply pipe.
[0018]
According to the present invention, since hot air is supplied from a plurality of supply ports arranged in the hollow portion and the supply efficiency of hot air is increased, the hot air is supplied to a wide area in the hollow portion, and the granular material of the foamed resin molded body is efficiently removed. Can be heated.
The position where the hot air supply pipe is extended is not limited, and the hot air supply pipe is extended to the upper part of the hollow part to supply hot air downward, or the lower part of the hollow part is extended upward. Thus, the structure is appropriately changed so that the hot air is supplied over a wide range in the hollow portion. Further, the number of supply ports is not limited, and is appropriately changed so that hot air is efficiently supplied into the hollow portion.
[0019]
Therefore, in the heating volume reduction device of the present invention, the entire granular material of the foamed resin molded body can be uniformly cured and the apparent specific gravity can be increased uniformly, so that the foamed resin molded body is suitable for reuse. The volume can be reduced. Furthermore, since the maintainability and work efficiency are increasing, the cost for volume reduction of the foamed resin molded product can be reduced.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
In this embodiment, a case where EPS is used for the foamable resin molded body will be described as an example.
[0021]
FIG. 1 is a side sectional view showing a heating and volume reducing device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, illustrating the heating and volume reducing device according to the embodiment of the present invention. FIG. 3 is a side view showing a ribbon screw of the heating and volume reducing device according to the embodiment of the present invention. 4A and 4B are views showing the filtering means according to the embodiment of the present invention, wherein FIG. 4A is a side sectional view showing when the filtering means sucks, and FIG. 4B is a side showing when the filtering means expands. It is sectional drawing.
[0022]
First, the structure of the heating volume reduction apparatus which concerns on embodiment of this invention is demonstrated.
As shown in FIGS. 1 and 2, the heating and volume reducing apparatus 1 includes an apparatus main body 10 into which EPS granular material is charged, hot air supply means 20 for supplying hot air into the apparatus main body 10, and an inside of the apparatus main body 10. Ribbon screws (stirring means) 30 and 31 for rotating and stirring the EPS granular material are main parts, and the EPS granular material charged into the apparatus main body 10 is heated by hot air to reduce the volume. .
[0023]
Next, each component will be described.
As shown in FIGS. 1 and 2, the apparatus main body 10 has a hollow portion 11 having a horizontally long bottom surface (a semi-cylindrical shape in the present embodiment) that is horizontally disposed. The silo 2 for quantitatively charging the EPS granular material into the part 11, the discharge port 12 for discharging the reduced volume EPS, and the exhaust means 40 for exhausting the hot air supplied into the hollow part 11 are provided. Yes.
[0024]
As shown in FIG. 1, the silo 2 stores EPS granular material that has been crushed to a predetermined size in advance, and throws it into the hollow portion 11 from the upper part of the apparatus main body 10 and operates for a specified time. Thus, a predetermined amount of EPS granular material can be carried out from the silo 2 and supplied into the hollow portion 11 provided immediately below.
As shown in FIGS. 1 and 2, the discharge port 12 is an openable and closable opening provided at the center of the bottom surface for discharging the reduced volume EPS accumulated on the bottom surface of the hollow portion 11. A discharge blower 13 capable of sucking the reduced volume EPS is installed below the discharge port 12.
[0025]
As shown in FIG. 1, the exhaust means 40 is installed in the upper part of the hollow part 11, and exhausts hot air supplied into the hollow part 11 after filtering. Are provided with a plurality (three) of filtering means 41 formed to allow ventilation. The filtration means 41 is air permeable and is formed of a filter material that can remove EPS particulate matter before and after volume reduction contained in hot air. Moreover, the upper end part of each filtration means 41 is opened, and the venturi pipe 42 is installed. Further, a compression pump 43 (pressurizing means) for sending compressed air into each filtering means 41 is installed above the venturi 42.
[0026]
Here, in the venturi pipe 42, a suction action occurs due to a change in flow velocity due to a pressure difference in the pipe. Therefore, as shown in FIG. 4A, hot air in the hollow portion 11 passes through the filtration means 41 and enters the exhaust means 40. Exhausted.
In addition, in the present embodiment, when the hot air is filtered, if the EPS particulate matter before and after volume reduction contained in the hot air adheres to the surface portion of the filtering means 41, the exhaust of the hot air is hindered. As shown in FIG. 4 (b), compressed air is blown from the compression pump 43, which is a pressurizing means, into the filtering means 41 at a predetermined period (for example, 1 kg / cm ² of compressed air is blown every 10 seconds). The surface of the filter means 41 is vibrated by expanding the filter means 41 so as to remove deposits on the surface of the filter means 41.
[0027]
Further, as shown in FIGS. 1 and 2, the hot air supply means 20 includes two hot air supply pipes 21 and 21 penetrating the upper portion of the hollow portion 11 along the wall surface in the major axis direction, and hot air. From a plurality of supply ports 22 arranged in the axial direction of the supply pipe 21 at a predetermined interval, a heater 23 for blowing hot air into each of the hot air supply pipes 21, 21, and a circulation blower 24 (hot air supply source) The supply port 22 is configured to supply hot air downward.
As shown in FIG. 1, the heater 23 and the circulation blower 24 are installed at both ends of the hot air supply pipe 21, and the circulation blower 24 communicates with the inside of the exhaust means 40 by the pipe 25. The hot air in 40 is sucked by the circulation blower 24, passed through the heater 22 and blown into the hot air supply pipes 21, 21, thereby effectively using the hot air for circulation.
A decompression means 3 for decompressing the inside of the hollow portion 11 is installed on the right side of the hot air supply pipe 21 in FIG. 1, and the decompression means 3 draws the air in the hollow portion 11 through the hot air supply pipe 21. It is an exhaust device that decompresses the inside of the hollow portion 11 by forcibly exhausting.
[0028]
Further, as shown in FIGS. 1, 2, and 3, the ribbon screws 30 and 31 include a rotary shaft 32 that is rotatably supported in a state of passing through a substantially central portion of the hollow portion 11 in the axial direction, The assembly ribbon screw 30 and the diffusion ribbon screw 31 which are spirally formed wings around the rotation shaft 32 at positions spaced from the rotation shaft 32, and rotations installed at both ends of the rotation shaft 32 The assembly ribbon screw 30 is formed around a diffusing ribbon screw 31 installed in a concentric position, and each ribbon screw 30, 31 is erected at a predetermined position on the rotary shaft 32. The rod-shaped support member 34 is fixed. Further, the collecting ribbon screw 30 causes the EPS granular material in the hollow portion 11 to gather at the center in the axial direction when the rotary shaft 32 is rotated in a predetermined direction, so that two blades in different spiral directions The parts are opposed at the center in the axial direction, and the diffusing ribbon screw 31 diffuses the EPS granular material in the hollow part 11 in the axial direction when the rotating shaft 32 is rotated in a predetermined direction. Two wings in different spiral directions are opposed at the center in the axial direction.
[0029]
In addition, when using EPS for a foaming resin molding, it is necessary to set the temperature of the hot air supplied from the hot air supply means 20 to about 120 degreeC. Moreover, it is necessary to adjust the wind speed and temperature of hot air in anticipation of the particle size and apparent specific gravity after volume reduction of the EPS granular material. The speed and temperature need to be set to optimum values depending on the particle size of the EPS granular material before and after volume reduction, the specific gravity, and the processing amount. In this embodiment, in the hollow portion 11, the pipe 25, and the supply port 22. The temperature of the hot air is measured by an installed temperature measuring instrument (not shown), and an optimum value is automatically maintained by a temperature control means (not shown).
[0030]
Next, the operation of the heating volume reducing device 1 will be described.
First, as shown in FIG. 1, the heater 23 and the circulation blower 24 are operated, hot air is blown into the hot air supply pipe 21, and adjusted to a predetermined temperature and a predetermined wind speed from each supply port 21 into the hollow portion 11. Supply hot air. The hot air is blown downward along the wall from both sides of the cylindrical hollow portion 11, and then merges and rises from the bottom surface. Since the supply ports 22 are arranged in the axial direction of the hot air supply pipe 21, the supply efficiency of hot air is increased, and hot air is supplied over a wide area in the hollow portion 11.
[0031]
Moreover, the silo 2 is operated and the EPS granular material pulverized in advance to a predetermined size by a crusher or the like is put into the hollow portion 11. At this time, the air in the hollow part 11 is forcibly discharged from the decompression means 3 and the suction action is produced by decompressing the inside of the hollow part 11, so that lightweight EPS granular material can be easily and quickly put in the hollow part 11. Can be thrown in. The amount of the EPS granular material supplied from the silo 2 is set in advance in the input control means (not shown) of the silo 2 in consideration of the residence time and the target volume reduction rate. Is done.
And the thrown-in EPS granular material will be in a floating state in the hollow part 11 by riding on the flow of the rising hot air.
[0032]
Further, the ribbon screws 30 and 31 are rotated to forcibly rotate and stir the suspended EPS granular material. Thereby, the EPS granular material is diffused by the diffusion ribbon screw 31 in the vicinity of the rotating shaft 32, and is gathered by the collecting ribbon screw 30 outside the diffusion ribbon screw 31. Here, each ribbon screw 30, 31 is formed at a position spaced apart from the rotating shaft 32, and the EPS granular material gathered or diffused in the sealed hollow portion 11 is caused by the wall surface of the hollow portion 11. The movement is restricted, and the EPS granular material is reliably stirred in the hollow portion 11 because it moves between the ribbon screws 30 and 31 and repeats the assembly and diffusion.
[0033]
Therefore, since the EPS granular material is rotated and stirred in a floating state in the hollow portion 11, it is uniformly heated by the hot air supplied from the heating means 20, and the entire particle is uniformly cured by discharging the contained gas. As a result, the apparent specific gravity increases (decreases).
[0034]
Here, circulation of hot air supplied into the hollow portion 11 will be described.
The hot air supplied into the hollow portion 11 is discharged into the discharge means 40 through the filtration means 41 by the suction action by the venturi tube 42 of the filtration means 41. At this time, EPS particulate matter before and after volume reduction may adhere to the surface portion of the filtering means 41, but the filtering member 41 is clogged because the filtering means 41 is vibrated at a predetermined cycle by the compression pump 43. This prevents the hot air exhaust from being hindered. The hot air exhausted into the exhaust means 40 is sucked into the circulation blowers 24, 24 through the pipe 25, passes through the heater 23 from the circulation blowers 24, 24, and is blown into the hot air supply pipe 21 to supply ports. 21 to the hollow portion 11. In this way, by circulating the hot air and effectively using the heat energy, a predetermined temperature can be maintained by applying a small amount of heat energy to the hot air, so that the amount of heat of the heater 23 is reduced.
[0035]
Then, after the EPS granular material reaches a predetermined apparent specific gravity after a certain time has elapsed, the supply of hot air from the hot air supply means 20 is stopped, and the reduced volume EPS is accumulated on the bottom surface of the hollow portion 11. The accumulated volume reduction EPS does not contact the diffusing ribbon screw 31 but collects at the center in the major axis direction on the bottom surface of the hollow portion 11 by the collecting ribbon screw 30 installed around the crushed ribbon screw 31. At this position, a discharge port 12 is provided, and the discharge port 12 is opened to discharge the reduced volume EPS from the hollow portion 11. At this time, the discharge blower 13 installed below the discharge port 12 is operated to suck and discharge the volume-reduced EPS, thereby reducing the weight from the hollow portion 11 without leaving any residue in the hollow portion 11. It is possible to easily and quickly take out a reduced volume EPS.
[0036]
Therefore, in the heating and volume reducing apparatus 1 according to the embodiment of the present invention, the entire EPS granular material can be uniformly cured and the apparent specific gravity can be increased uniformly, so that the reduced volume EPS is suitable for reuse. The volume can be reduced. Furthermore, since maintainability and work efficiency are increasing, the cost for volume reduction of EPS granular materials can be reduced.
[0037]
As mentioned above, although an example about the suitable embodiment of the present invention was explained, the present invention is not limited to the above-mentioned embodiment, and design change is possible suitably in the range which does not deviate from the meaning of the present invention.
For example, the foamed resin molded body is not limited to EPS, and any type of foamed resin molded body that can be reduced in volume by heating can be used.
Further, the stirring means for rotating and stirring the EPS granular material is not limited to the shape of the ribbon screws 30 and 31, and if the EPS granular material is efficiently rotated and stirred, the rotating shaft 32 may be provided. A configuration in which a wing portion is installed for each standing support member 34 or a configuration using only the support member 34 may be used. Note that the heights of the support members 34 and the wing portions do not need to be the same, and are determined appropriately in consideration of the efficiency of rotation and stirring.
Further, a harmful gas measuring device (for example, a butane gas measuring device) may be installed in the exhaust means 40. In this configuration, the concentration of harmful gas contained in the circulating hot air is measured by the measuring device, and the numerical value is calculated. When the standard value is exceeded, it is possible to prevent accidents and breakdowns due to the ignition of harmful gases, etc. by discharging hot air to the outside. In addition, the harmful gas used as a measurement object is suitably changed corresponding to various foamed resin moldings.
[0038]
【The invention's effect】
According to the heating volume reduction device of the present invention, the foamed resin molded body can be uniformly cured by uniformly heating the granular material while rotating and stirring the granular material of the foamed resin molded body in a floating state. Since the apparent specific gravity can be increased uniformly, the volume of the foamed resin molded product can be reduced to a state suitable for reuse. Furthermore, in the structure which provided the some supply port in the hot air supply pipe extended in the hollow part, since the supply efficiency of a hot air increases, the granular material of a foamed resin molding can be heated efficiently.
In addition, when the granular material of the foamed resin molding is put into the hollow part, the suction action is generated in the hollow part by depressurizing the inside of the hollow part. It is possible to improve work efficiency. Furthermore, work efficiency can be improved more by comprising so that a suitable quantity of the granular material of a foamed resin molding may be automatically supplied in a hollow part.
Moreover, maintainability can be improved by comprising so that the filtration means provided in the hot air exhaust means may be automatically cleaned.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a heating and volume reducing apparatus according to an embodiment of the present invention.
FIG. 2 is a view showing a heating and volume reducing device according to an embodiment of the present invention, and is a cross-sectional view taken along line AA of FIG.
FIG. 3 is a side view showing a ribbon screw of the heating and volume reducing device according to the embodiment of the present invention.
4A and 4B are views showing a filtering means according to an embodiment of the present invention, in which FIG. 4A is a side sectional view showing when the filtering means sucks, and FIG. 4B is a side showing when the filtering means expands. It is sectional drawing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat reduction device 2 ... Silo 3 ... Decompression means 10 ... Device main body 11 ... Hollow part 20 ... Hot air supply means 21 ... Hot air Supply pipe 22 ... Supply port 23 ... Heater 24 ... Circulation blower 25 ... Piping 30 ... Assembly ribbon screw 31 ... Diffusion ribbon screw 32 ... .... Rotating shaft 40 ... Exhaust means 41 ... Filter means 42 ... Venturi pipe 43 ... Compression pump

Claims (4)

An apparatus main body having a horizontally long hollow portion for floating the foamed resin molded article;
Hot air supply means for supplying hot air into the hollow portion;
Means for exhausting hot air supplied into the hollow portion ;
Agitation means for the granular material of the foamed resin molded product that is rotatably supported around the long axis of the hollow portion;
While the hot air supply means is supplying hot air into the hollow part, the pressure reduction means capable of depressurizing the hollow part ,
The hot air supply means is configured to suck hot air in the exhaust means and supply hot air into the hollow portion,
The decompression unit is configured to decompress the inside of the hollow part when the granular material of the foamed resin molding is put into the hollow part. . The exhaust means includes
Filtration means for the hot air formed hollow;
Suction means which is a venturi tube for sucking the hot air into the exhaust means through the filtering means;
A pressurizing means for pressurizing the inside of the filtering means,
2. The volume reduction device for heating a foamed resin molded article according to claim 1, wherein the filtering means is expanded by pressurization of the pressurizing means. The said apparatus main body is equipped with the supply means for supplying quantitatively the granular material of the said foaming resin molding in the said hollow part, The heating of the foaming resin molding of Claim 1 or Claim 2 characterized by the above-mentioned. Volume reduction device. The hot air supply means includes a hot air supply source,
The foamed resin molded body according to any one of claims 1 to 3, comprising a plurality of supply ports and a hot air supply pipe extending into the hollow portion. Heating volume reduction device.

Images