JP2003001631A - Method for treating foamed resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process in which when a foamed resin molding is regenerated, heating volume reduction treatment is made uniform, the volume reduction in a high quality state is done efficiently in a short time, the bulk density of the volume-reduced molding can be controlled widely, the reduction of the bulk density can be improved, the volume of the crushed molding can be reduced efficiently even when it is wet, and the burning of the treated molding and a phenomenon of the growth of a cake of the treated molding during the treatment can be prevented since there is no fear of fire by generated gas, enabling the safe operation of the treatment. SOLUTION: In a volume reduction process, the used foamed resin molding is crushed primarily and secondarily by crushing means into particles of 3-10 mm particle size, the crushed molding is packed in the volume reduction part of a mold having a steam hole, steam of 116-126 deg.C is supplied into the mold of the volume reduction part for a heating time of 30-60 s to reduce the volume of the crushed molding by heating. The volume-reduced crushed molding is taken out from the mold and crushed tertiarily into granules, and the granules wetted by the steam are dried in a drying process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a foamed resin molded article used for collecting and reclaiming a molded article such as a thermoplastic synthetic resin block such as expanded polystyrene used as a packaging material or a packaging material, or a plate. In particular, the present invention relates to a method for treating a Styrofoam product that efficiently reduces and reduces the volume as a raw material without causing melt decomposition.

[0002]

2. Description of the Related Art Generally, Styrofoam is widely used as a packing material or packing material for various products because it is excellent in cushioning property, heat insulating property, and heat retaining property. Since the packaging materials and packaging materials that have been molded into shapes have been used up until now, they have been simply thrown away and discarded or incinerated. From the pollution problem of environmental destruction such as air pollution due to foul odor generation and smoke emission,
Its disposal is difficult. Therefore, in the past, in order to regenerate these Styrofoam molded products, they were crushed into small pieces,
It has been proposed to reduce the volume of this by a heat source of far-infrared radiation during transportation on a conveyor. (Japanese Utility Model Laid-Open No. 1-89110, Japanese Patent Laid-Open No. 6-166034).

[0003]

However, in the process of volume reduction by far infrared rays with finely pulverized styrofoam, the shrinkage is time-consuming and inefficient, and is not suitable for large-scale processing. Because it is open to the atmosphere for improvement, it is easily affected by the ambient temperature and temperature control is difficult.In particular, crushed objects to be wetted with water have a certain volume loss due to unstable heat application. It becomes impossible or the volume reduction rate changes due to changes in the amount of processed material, making it difficult to keep constant and becoming inhomogeneous.
Further, there is a limit in controlling the volume specific gravity to be 0.2 to 0.3, which is a problem because the volume reduction is limited. Moreover, in the volume reduction process of the foamed resin crushed by heating, the gas remaining inside will come out and the heat of the heater will easily ignite the fire, which may cause a fire. Even if the machine stops, there is a risk that the object to be processed will overheat and the gas will need to be sucked out with a blower or the like and discharged to the outside of the machine. There was a problem that the objects became dumpling-like lumps, and it was troublesome in handling such as safety of operation and maintenance and maintenance inspection.

The present invention is intended to eliminate these conventional drawbacks, and the volume reduction rate is made uniform by the fluctuation of the object to be crushed during the reprocessing of the foamed resin molded product, resulting in a high quality condition. The volume can be reduced efficiently in a short time, and the volume reduction temperature can be easily selected by controlling the vapor pressure for volume reduction treatment, so the volume reduction bulk density can be widely controlled and workability is remarkably improved. In addition to being able to improve, the heat capacity of the steam is relatively large, so that it is possible to work without being influenced by the temperature around the volume reduction equipment, it is possible to reduce the volume of a certain quality, and the crushed material is wet with water. However, since the volume can be reduced efficiently and there is no risk of fire due to the generated gas, the danger of burning of the object to be processed during processing and the bloat of the processed material can be prevented, and safe operation can be maintained. Easy departure from security It is intended to provide a resin molded product processing method.

[0005]

According to the present invention, a used foamed resin molded product is subjected to primary crushing and secondary crushing by a crushing means to obtain a particle size of 3 to 10 mmφ, and the crushed product is a mold having a steam hole. Fill the inside of the volume reducing part of the
After a volume reduction process of supplying steam at 16 to 126 ° C. for a heating time of 30 to 60 seconds to reduce the volume by heating, the volume reducing body is taken out of the mold and is pulverized into third particles by crushing means. Along with the above, the steam-wet granules are dried in a drying step to process the foamed resin molded product, and the volumetric reduction rate of the foamed resin molded product is made uniform, resulting in efficient volume reduction in a high quality state in a short time. it can. Further, in the present invention, the steam pressure of the steam supplied is 0.0
78 to 0.147 MpaG (0.8 to 1.5 kg / cm
² G ) To reduce the volume and to control the volume specific gravity so that the volume specific gravity is 0.1 to 0.3. The volume reduction temperature can be easily controlled by controlling the vapor pressure. Since it can be selected, the volume specific gravity can be greatly improved, and it can be widely controlled, and the workability can be remarkably improved.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiment of the present invention, a used foamed resin molded product is transferred by a conveyor to remove foreign matters and put into a crusher, and then put into a crusher by a crushing means of the crusher. The foamed resin molded product is subjected to primary crushing and secondary crushing, crushed into small pieces having a particle size of 3 to 10 mmφ in a short time and once supplied to a silo, and the crushed product passes through a molding machine hopper and is a mold having steam holes. The volume-reducing part of No. 1 is filled with an injector, and the temperature of the volume-reducing part is 110 to 130 ° C, preferably 1
The steam pressure of 16 to 126 ° C is 0.078 to 0.1.
47 MpaG (0.8-1.5 kg / cm ² G ), And the heating time is fed for 30 to 60 seconds to reduce the volume of the pulverized material in the mold by heating, reducing the volume, and making the volume reduction rate uniform. After this volume reduction process, the volume reducing body is taken out from the mold, and is dropped on a conveyor to be conveyed and pulverized by a crushing means to be tertiary pulverized. The foaming resin molded product is processed by drying in the drying process described above.Since the heat capacity of steam is relatively large, it is possible to work regardless of the temperature around the volume reduction equipment, and it is possible to reduce the volume of a certain quality. Even if the crushed product is wet with water, the volume can be efficiently reduced, and there is no risk of fire due to the generated gas, so there is a risk that the object to be processed will burn during processing and the lumpy expansion phenomenon of the object to be processed. In addition, it can be operated safely, and maintenance and security can be done easily.

[0007]

EXAMPLE An example of the present invention will be described with reference to the example of the system diagram of FIG.
Then, the used foamed resin molding a is transferred by the conveyor 1.
Then remove foreign matter and put it into the crusher 2 to form the foamed resin.
A plurality of first crushing rolls 3 for crushing the shaped object are arranged opposite to each other,
Crushing in which a plurality of second crushing rolls 4 are arranged facing each other below
The foamed resin molding a introduced by the crushing means of the machine 2 is
Primary pulverization, secondary pulverization, particle size 3-10 mmφ in a short time
Is crushed into small pieces and once supplied and stored in the silo 5. So
Then, the resin material crushed by the crusher 2 is removed from the silo 5
After passing through the molding machine hopper, inside the volume reduction part of the die 6 with steam holes
It is filled with a throwing device 7, and the temperature of 1
Steam at 10 ° C to 130 ° C, preferably 116 to 126 ° C
The steam pressure from the steam source 8 is 0.078 to 0.147 MPa.
G (0.8-1.5 kg / cm^TwoG ) Control and heating
For 30 to 60 seconds while heating and shrinking the crushed material in the mold 6.
Mold volume-reduced body b with reduced volume and uniform volume reduction rate
To do. Next, the mold 6 of the volume reducing part is opened to remove the volume reducing body b.
Take out and crush into granules with a crusher 9 equipped with a crushing roll
After the third crushing step,
A) Drop supply on 10 and transfer on the belt conveyor 10.
The granules c that have been wetted with the steam are not supplied to the vacuum device 12 and the air source.
Dry in the drying process by the drying device 11 connected to
This is to treat a foamed resin molded product.

In this case, the steam temperature is 110 ° C.
It is considered that the temperature is 130 ° C., preferably 116 to 126 ° C., considering that the heat distortion temperature of the expandable polystyrene starts at about 95 ° C. and the molding temperature of the expanded polystyrene is 110 ° C. to 120 ° C. That is, the shrinkage does not start at a temperature of 110 ° C or lower, and the shrinkage starts in hot water at a temperature of 130 ° C or higher,
This is because they are not constant and melt and solidify. further,
Since the pressure of the steam used is directly proportional to the temperature,
0.078-0.147MpaG (0.8-1.5kg
/ Cm ² G ) Is recommended. Furthermore, the heating time is 3
This is a volume reduction process in which steam is supplied for 0 to 60 seconds to reduce the volume by heating and shrinking, but because the molding ratio of the primary and secondary crushed styrene boxes is different, there is also water wetting and the like, and it takes less than 30 seconds. If it is present, it will not shrink, and if it is 60 seconds or more, it will melt and solidify without shrinking, so it should be avoided. Temperature = pressure and heating time are controlled by the required bulk specific gravity.
Further, in the heating volume reduction step, the volume specific gravity of supply volume reduction is
The volume reduction temperature can be easily selected by controlling the vapor pressure by controlling the vapor pressure to 0.1 to 0.3.

The crushing rolls 3 and 4 have cutting blades on their outer circumferences, and the cutting blades are arranged so as to mesh with each other, and a predetermined packing material is loaded by being driven by a motor (not shown). The crusher 2 is crushed into a size and constitutes a crusher 2 which is continuously arranged on the conveyor 1.

Further, the belt conveyor 10, using a heat resistant belt conveyor made of glass fibers or the like, the amount of has been treated crushed by crusher 9 with grinding rolls 9 ₁ and often drying efficiency is lowered, the belt The speed of the conveyor 10 is changed. That is, in order to keep the degree of drying constant, the drive unit (not shown) of the belt conveyor 10 is controlled so that the speed of the belt conveyor 10 can be automatically changed.

In this case, the processed material on the belt conveyor 10 falls to the collection box 13 by its own weight, but the adhering end of the belt conveyor 10 is provided with a member for removing the adhered material on the belt conveyor 10 to the collection box 13. In addition, the thing that adheres to the belt and is hard to fall off is surely blown off to the collection box 13 to improve work efficiency. In addition,
The belt conveyor 10 is mounted endlessly, and it is also effective to apply Teflon (registered trademark) containing carbon for conductivity to the surface of the belt to prevent static electricity adhesion.

In the volume reduction process, the temperature 116
Steam pressure of ~ 126 ° C from the steam source 8 to 0.078
~ 0.147 MpaG (0.8-1.5 kg / cm ² G
The heating time is controlled for 30 to 60 seconds and the treatment is performed, but the steam pressure and the heating time can be freely controlled depending on the volume reduction volume. For example, the steam pressure to be used can be used in the same manner as in the polystyrene foam resin molding.

Further, as the mold 6 of the volume reducing section, as shown in FIG.
As shown in Fig. 5, a pair of molds that can be opened and closed is used, and the crushed resin material is filled in the cavity 60 in the metal mold 6 having the steam holes through the molding machine hopper by the injector 7. The steam at a temperature of 116 to 126 ° C. is fed into the mold 6 of the container from a steam pipe connected to the steam source 8, and this heating process is a device for reducing the heating and reducing the volume. The heating volume reducing unit 6 is arranged on the belt conveyor 10 in order to improve the processing efficiency, and it is preferable to interpose the crusher 9 in the third crushing step, and the heating and reducing unit 6 is dried on the belt conveyor 10. It is preferable to arrange the devices 11 side by side so that the processed products on the belt conveyor 10 can be easily collected in the collection box 13. In this case, when the molding die 6 is opened, it is preferable to use a molding die provided with a mold releasing pin (not shown) to facilitate the mold release of the molded volume reducing body b.

[0014]

According to the present invention, a used foamed resin molded product is subjected to primary crushing and secondary crushing by a crushing means to obtain a particle size of 3 to 10
mmφ, the crushed product is filled in the volume reducing part of the mold having steam holes, and steam at a temperature of 116 to 126 ° C. is fed into the mold of the volume reducing part for a heating time of 30 to 60 seconds to reduce the heat. After the volume reduction step of reducing the volume, the volume reducing body is taken out from the mold and is pulverized by a crushing means to be thirdly pulverized,
By drying the steam-wet granules in the drying step, the volume reduction rate is made uniform by the fluctuation of the object crushed during the reprocessing of the foamed resin molded product, and the volume reduction in the high quality state is reduced. Can be efficiently performed in a short time, and the volume reduction temperature can be easily selected by controlling the vapor pressure for volume reduction treatment, so that the volumetric volume specific gravity can be widely controlled and the workability is remarkably improved. And the heat capacity of the steam is relatively large,
It is possible to work without being affected by the temperature around the volume reduction equipment, and it is possible to reduce the volume of a certain quality, and even if the crushed material is wet, it is possible to efficiently reduce the volume, and there is a fear of fire due to the generated gas. Since it does not exist, it is possible to prevent the danger of burning of the object to be processed during processing and the bloat phenomenon of the object to be processed, to safely operate and operate the foamed resin molded product with easy maintenance. .

[Brief description of drawings]

FIG. 1 is a system explanatory view showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a volume reducing portion used in the example of FIG.

[Explanation of symbols]

1 Conveyor 2 Crusher 3,4 Grinding Roll 5 Collection Box 6 Heating Volume Reduction Unit 7 Charger 8 Steam Source 9 Crusher 9 ₁ Grinding Roll 10 Belt Conveyor 11 Dryer 12 Vacuum Device 13 Collection Box 60 Cavity

Claims (4)

[Claims] 1. A used foamed resin molding is subjected to primary crushing and secondary crushing by a crushing means to obtain a particle size of 3 to 10 mmφ,
The crushed product is filled in the volume reducing part of a die having steam holes, and steam having a temperature of 116 to 126 ° C. is fed into the die of the volume reducing part for a heating time of 30 to 60 seconds to reduce the volume by heating. The foamed resin characterized in that after undergoing the volume reduction step, the volume reduced body is taken out from the mold, the powder is tertiary pulverized by a crushing means, and the steam-wet granules are dried by a drying step. Molded product processing method. 2. The vapor pressure of the vapor supplied in the heating volume reduction step is 0.078 to 0.147 MpaG.
(0.8-1.5 kg / cm ² G (3) The method for treating a foamed resin molded article according to claim 1, wherein the volume is controlled so that the volume is controlled. 3. The method for treating a foamed resin molded article according to claim 1, wherein the volumetric specific gravity of volume reduction is controlled to be 0.1 to 0.3 in the heating volume reduction step. 4. The foamed resin molding according to claim 1, wherein, in the step of drying the granules of the volume reducing body, the granular material is dried by a vacuum means used for the mold of the volume reducing section. Material processing method.