WO1997031972A1 - Procede pour realiser le retrecissement d'une resine moussee et appareil prevu a cet effet - Google Patents

Procede pour realiser le retrecissement d'une resine moussee et appareil prevu a cet effet Download PDF

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Publication number
WO1997031972A1
WO1997031972A1 PCT/JP1997/000475 JP9700475W WO9731972A1 WO 1997031972 A1 WO1997031972 A1 WO 1997031972A1 JP 9700475 W JP9700475 W JP 9700475W WO 9731972 A1 WO9731972 A1 WO 9731972A1
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WO
WIPO (PCT)
Prior art keywords
shrinking
foamed resin
tank
shrinkage
resin
Prior art date
Application number
PCT/JP1997/000475
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English (en)
Japanese (ja)
Inventor
Masahide Uchino
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Japan Field Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Field Co., Ltd. filed Critical Japan Field Co., Ltd.
Publication of WO1997031972A1 publication Critical patent/WO1997031972A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
    • C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention shrinks foamed resins such as foamed polystyrene and foamed polyurethane used as packaging materials, and transports, stores, and recycles these foamed resins that are regarded as waste. It is intended to make it easier. Background art
  • a foamed resin molded article such as foamed polystyrene or foamed polyurethane is heated by heat as disclosed in Japanese Patent Application Laid-Open No. 6-63529.
  • a device that melts and softens and blocks has been proposed.
  • the plastic waste can be degraded and decomposed into small pieces. There is something that did.
  • the foamed resin can be shrunk or dissolved.
  • a contracting agent is brought into contact with a foamed resin in a liquid state, and the foamed resin is dissolved or shrunk to recover the foamed resin.
  • the method of irradiating plastic waste such as foamed resin with radiation to degrade plastic waste and decompose it into small pieces uses radiation, which may have a negative impact on the environment.
  • it has the disadvantage that it requires a variety of equipment for radiation protection and requires a great deal of cost to dispose of plastic waste.
  • a contracting agent capable of shrinking or dissolving the foamed resin is brought into contact with the foamed resin in a liquid state, and the foamed resin is recovered by dissolving or shrinking the resin.
  • the shrinking agent is used in a liquid form, it has a disadvantage that a large amount of shrinking agent is required.
  • the present invention eliminates the above-mentioned disadvantages, enables a large amount of foamed resin to be shrunk and recovered with a small amount of a shrinking agent, and collects the shrinking agent used for the shrinking in a separate process from the shrinking operation. Instead, it is intended to be possible in the same process, and to enable quick, inexpensive and inexpensive shrinkage of foamed resin.
  • the present invention is characterized in that the foaming resin is shrunk by vaporizing a shrinking agent of the foaming resin and bringing the shrinking agent vapor into contact with the foaming resin. That is what you do.
  • the foaming resin is shrunk by heating the shrinking agent of the foaming resin in the steam generating section to vaporize the shrinking agent and bringing the shrinking agent vapor into contact with the foaming resin in the shrinking tank.
  • the condensing agent vapor in the shrinking tank is introduced into the condensing section to be condensed and liquefied, and the liquefied condensing agent is circulated to the steam generating section to be vaporized, thereby producing condensing agent vapor. It is.
  • an apparatus embodying the invention of the above method comprises a steam generating section for heating and evaporating the shrinking agent of the foamed resin, and communicating with the steam generating section to introduce the shrinking agent vapor to remove the foamed resin inside. It consists of a shrinking tank that shrinks and a condensing section that introduces a shrinking agent vapor in the shrinking tank to condense and liquefy.
  • an outlet for shrinking foaming resin is provided, and a screw extruder is connected to this outlet to connect the shrinking foaming resin.
  • the fat may be extruded under pressure by a screw extruder.
  • an outlet for the shrinked foamed resin is provided, and by introducing compressed gas into the shrinkage tank, the shrinked foamed resin is pressurized by the compressed gas. It may be one that can be pushed out from the outlet.
  • the shrink tank may be one in which the wall surface can be heated.
  • the contact between the shrinkage agent vapor and the foamed resin may be performed under reduced pressure.
  • the steam generating section, the shrinkage tank, and the condensing section may be connected to a pressure reducing mechanism so as to be able to reduce the pressure.
  • the steam generating section may be formed outside the shrink tank so that the shrink agent vapor generated in the steam generating section can be introduced into the shrink tank.
  • the steam generator may be formed inside the shrink tank so that the shrink agent vapor can be generated in the shrink tank.
  • the shrinking agent of the foamed resin is selected from aromatic hydrocarbons, chlorinated hydrocarbons, ketones, glycol ethers, naphthenic hydrocarbons, paraffin hydrocarbons, limone, and higher alcohols.
  • aromatic hydrocarbons chlorinated hydrocarbons, ketones, glycol ethers, naphthenic hydrocarbons, paraffin hydrocarbons, limone, and higher alcohols.
  • One or a plurality of selected types may be used.
  • the foamed resin may be foamed polystyrene.
  • the foamed resin may be foamed polyurethane.
  • the contracting agent of the foamed resin is vaporized by heating and the vaporized resin is brought into contact with the foamed resin. It can be easily contracted.
  • the contact between the foaming resin and the shrinking agent is such that since the shrinking agent is vaporized, the steam can efficiently contact the entire outer peripheral surface of the foaming resin. The contact efficiency can be significantly increased as compared with the case of contacting with a liquid shrinking agent.
  • the shrinkage agent vapor is introduced into a certain shrinkage tank, and if the shrinkage agent vapor is brought into contact with the foamed resin in a closed state in this shrinkage tank, the shrinkage agent vapor is introduced into the shrinkage tank. After the shrinkage agent vapor comes into contact with the foamed resin, it is introduced into the condensing section to be collected and condensed and liquefied. Then, the condensed and liquefied shrinkage agent is circulated to the steam generating section, where it can be vaporized and used for shrinkage of the foamed resin. It can be used for shrinking foamed resin. This eliminates the need to separate the shrinking resin and shrinking agent in a separate step from the shrinking step, unlike the case of using a conventional liquid shrinking agent, and collects the shrinking agent in the same step as the shrinking step. It is possible to do.
  • condensation section by setting the condensation section, shrinkage tank, steam generation section, etc. in a reduced pressure state using a pressure reducing mechanism such as a vacuum pump, it is possible to generate steam at a low boiling point, and the inside of these systems is kept at low temperature. It can be converted. Therefore, when a flammable solvent or the like is used as a shrinking agent, it is possible to perform a safe shrinkage operation of the foamed resin, together with the fact that air does not easily exist inside.
  • the inside of this shrinkage tank is heated by making the shrinkage tank a double wall, and circulating superheated steam between the double wall, so that the surface of the shrinkage tank becomes high temperature. This facilitates volatilization of the steam flowing into the shrinkage tank. Then, the solvent adhering to the surface of the foamed resin that has come into contact with the shrinkage agent vapor can be quickly volatilized and guided to the condensing section, so that waste of the shrinkage agent and waste of the shrinked foamed resin can be reduced. It is possible to prevent the incorporation of a contracting agent.
  • the shrinked foamed resin does not harden and can be kept in a soft state.
  • the flowability of the shrinked foamed resin during the next step of the regeneration process Can be maintained, and processing becomes easier.
  • the shrinked foamed resin is treated by introducing the foamed resin having fluidity into a screw extruder from a discharge port provided at a lower end or the like, and pressurizing the resin in the screw extruder to appropriately press the resin.
  • the regenerated resin is discharged to the outside in the form of a plate, a plate, or a string, so that the processing of the regenerated resin in a later process can be facilitated.
  • the process of discharging the contracted foamed resin to the outside may be performed by introducing a compressed gas into the inside of the contraction tank and using the pressure of the compressed gas.
  • a compressed gas such as nitrogen or carbon dioxide is introduced into the shrinkage tank.
  • compressed gas such as nitrogen or carbon dioxide is introduced into the shrinkage tank.
  • the foamed resin in the shrinkage tank is pushed out from the discharge port to discharge the foamed resin to the outside.
  • the foamed resin in the shrink tank is forcibly pushed out by the compressed gas.
  • the steam generating section may be formed outside the shrink tank so that the shrink agent vapor generated in the steam generating section can be introduced into the shrink tank via a pipe or the like.
  • the steam generating section may be formed inside the shrink tank, a liquid shrinking agent may be introduced into the shrink tank, and the steam generating section may generate the shrinking agent vapor in the shrink tank.
  • the shrinking agent used to shrink the foamed resin is aromatic hydrocarbons such as benzene, toluene, xylene and styrene, and chlorinated hydrocarbons such as tetrachloroethylene and trichloroethylene.
  • aromatic hydrocarbons such as benzene, toluene, xylene and styrene
  • chlorinated hydrocarbons such as tetrachloroethylene and trichloroethylene.
  • Solvents and other naphthenic hydrocarbons include cyclohexanone, methylenocyclohexanone, cyclohexanol, methylcycloexanol, and normaldecane for paraffin hydrocarbons. Noremarandecane, etc., limonene, higher alcohol In the class, one or more kinds selected from organic solvents such as butyl carbitol can be used. BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1 is a sectional view showing a first embodiment of the present invention.
  • FIG. 2 is a sectional view of the second embodiment showing a state in which two shrinkage tanks are provided.
  • FIG. 3 is a sectional view of the third embodiment showing a state in which a condensed portion is formed inside the shrinkage tank.
  • FIG. 4 is a sectional view of the fourth embodiment showing a state in which a compressed gas introduction valve is provided in a shrinkage tank.
  • FIG. 5 is a cross-sectional view of the fifth embodiment showing a state in which a steam generator is provided inside the shrinkage tank.
  • (1) is a shrinkage tank, which is provided with a foaming resin (2) provided at an upper end thereof through a hopper (3) to open / close valves (4) ( The foamed resin (2) introduced through 5) comes into contact with the shrinkage agent vapor supplied from the steam generating section (6) through the supply valve (7), and the foamed resin (2) is internally formed. ).
  • the shrinkage steam used for shrinking the foamed resin (2) is benzene, toluene, xylene, styrene, etc. for aromatic hydrocarbons, and tetrachloro for chlorine-based hydrocarbons.
  • Glycols such as acetone, methylethylketone, methylbutylketone, methylisobutylketone, etc. for ketones, such as loethylene, trichloroethylene, dichloromethane, etc.
  • ethers For ethers, methylcellosol, cellosol, butylcellosolve, etc.
  • naphthenic hydrocarbons cyclohexanone, methylcyclohexanone, cyclohexanol, methylcyclohexanol, etc.
  • a kind selected from organic solvents such as normaldecane and normalandecan for halaffin hydrocarbons and organic solvents such as limonene and butylcarbitol for higher alcohols
  • Others can be constituted Ri by the plurality of types, these contractions agent (1 0) and heated At a the steam generator (6), as a shrinking agent vapor shrinkage tank (1) on the It is introduced from the department.
  • an appropriate baffle plate (8) is provided at the center to prevent the foamed resin (2) charged from the charging hopper (3) from dropping rapidly toward the lower end. ),
  • the foamed resin (2) is widely dispersed in the shrinkage tank (1) by the baffle plate (8) to improve the contact with the shrinkage agent vapor. I have. If the steam introduced into the shrinkage tank (1) has a specific gravity higher than that of air, it falls downward and makes contact with the foamed resin (2). After the contraction of (2), it is led to the condensing section (9), where it is liquefied and collected in this condensing section (9).
  • the condenser (9) is filled with cooling water (32) inside the cooling tank (31), and a flow pipe (33) for the contraction agent vapor is introduced into the cooling water (32). By disposing, the condensing agent vapor inside the distribution pipe (33) is condensed. Also, a cooling water inlet pipe (34) and a cooling water outlet pipe (35) are formed in the cooling tank (31), and the cooling water (32) is led to a cooling section (not shown) and circulated. In this way, the temperature of the cooling water (32) is kept constant.
  • the shrink tank (1) has an outer peripheral wall (11) formed of a double wall,
  • the temperature in the shrinkage tank (1) is increased, and the volatilization and recovery of the shrinkage agent vapor after contact with the foamed resin (2) is facilitated.
  • the superheated steam is introduced from the inlet pipe (36), discharged from the outlet pipe (37), led to the heating section (not shown), and again led to the inlet pipe (36) for recirculation. It is.
  • the shrinkable foamed resin (2) having fluidity is supplied from a discharge port (19) at the lower end of the shrinkage tank (1) to a screw connected via a discharge valve (13) (14). It is guided into a user extruder (15), and is extruded as a regenerated resin (21) in an appropriate shape such as a plate or a wire to facilitate reprocessing in the next step.
  • the liquefied contracting agent (10) of the contracting agent vapor condensed in the condensing section (9) Is led to the condensing section (9), and after being cooled in the condensing section (9), is led to the condensate tank (16).
  • a decompression mechanism (17) composed of a vacuum pump or the like is connected to the condensate tank (16), and by operating the decompression mechanism (17), the condensate tank (16) is operated. ), It is possible to reduce the pressure in the condensing section (9), the shrinkage tank (1) and the steam generation section (6) connected to the shrinkage tank (1).
  • This reduced pressure enables the generation of the shrinkage agent vapor at a lower temperature than the boiling point at normal atmospheric pressure, so that when a flammable solvent or the like is used for the shrinkage agent vapor, It is possible to shrink the foamed resin (2) in a safe, safe and low-air condition, and to perform safe work.
  • the pressure in the shrinkage tank (1) is reduced, the shrinkage agent vapor on the surface adhering to the shrinked foamed resin (2) is easily volatilized by coming into contact with the steam, and the condensing part (9) It is possible to lead to.
  • the shrinkage of the foamed resin (2) and the recovery of the shrinkage agent (10) used for this shrinkage can be performed simultaneously while performing shrinkage work in one shrinkage tank (1).
  • the condensing agent (10) condensed in the condensing section (9) and led to the condensed liquid tank (16) passes through the flow pipe (18) to the steam generating section (6). It is circulated, heated in the steam generating section (6) and vaporized, and can be led to the shrinkage tank (1). For this reason, a small amount of the shrinking agent (10) can be used repeatedly, and the work of shrinking the foamed resin (2) can be performed at low cost.
  • a normal pressure tank (27) communicating with the outside air is interposed between the condensate tank (16) and the circulation pipe (18).
  • One end of a flow pipe (18) is connected to the lower end of the normal pressure tank (27).
  • a first on-off valve (28) and a second on-off valve (29) are led out at a fixed interval. It is arranged in series with the pipe (30). Then, the first on-off valve (28) is opened and closed while the second on-off valve (29) is closed. Then, a contraction agent (10) enters between the first on-off valve (28) and the second on-off valve (29), and the contraction agent (10) is supplied to the second on-off valve (29). It is introduced into the normal pressure tank (27) by opening. Further, since the first on-off valve (28) is closed, it does not hinder the depressurized state of the condensate tank (16).
  • two on-off valves (4) and (5) are arranged vertically in the upper part of the shrink tank (1) of the foamed resin (2) so that they can be individually controlled.
  • two discharge valves (13) and (14) are provided at the top and bottom.
  • the foamed resin (2) reaches the lower open / close valve (5) from the charging hopper (3). I do. In this state, the upper open / close valve (4) is closed, and the lower open / close valve (5) is opened, so that the upper open / close valve (4) and the lower open / close valve (5) are arranged.
  • the foamed resin (2) falls into the shrinkage tank (1) and the communication between the charging hopper (3) and the shrinkage tank (1) is shut off by the open / close valve (4) at the top Have been. Therefore, there is no connection between the shrink tank (1) and the outside by the above operation, and the depressurized state in the shrink tank (1) is always maintained.
  • the upper discharge valve (13) is opened, the contracted foaming resin (2) is guided to the lower discharge valve (14), and the upper discharge valve (13) is closed.
  • the contraction tank (1) is contracted to the screw extruder (15) while the connection to the outside is cut off. It is possible to derive foam resin (2). By doing so, it is possible to perform the shrinking operation of the foamed resin (2) continuously by using one shrink tank (1).
  • two shrinkage tanks (1) are arranged in parallel, and the foamed resin (2) is alternately arranged in the shrinkage tank (1).
  • the shrinking work of the foamed resin (2) can be more efficiently performed.
  • one of the shrinkage tanks (1) is filled with a foamed resin (2) in advance, and the foamed resin (2) is brought into contact with the shrinkage agent vapor generated from the steam generator (6). Perform contraction work. After this shrinking operation is completed, while the shrinked foamed resin (2) is being introduced into the screw extruder (15), the foamed resin is shrunk in the other shrinkage tank (1). By performing the shrinking operation of (2) and repeating this alternately, the shrinking operation of the foamed resin (2) can be performed continuously.
  • the on-off valves (4) and (5) and the discharge valves (13) and (14) may be provided one by one in one shrink tank (1). Furthermore, by installing two on-off valves (4) (5) and discharge valves (13) (14) in the shrinkage tank (1), it is possible to continuously shrink the foamed resin (2). Can be made to proceed simultaneously in the two tanks, and more efficient shrinkage of the foamed resin (2) can be performed.
  • the pressure inside the shrinkage tank (1) is always kept at a reduced pressure by a pressure reducing mechanism (17) such as a vacuum pump.
  • a pressure reducing mechanism (17) such as a vacuum pump is not provided in the system, so that the apparatus can be simplified.
  • the shrinking agent (10) for shrinking the foamed resin (2) has a low boiling point.
  • Low boiling shrinking agent (10) In the case of using a foam, it is possible to work at a low temperature, and it is not necessary to lower the steam generation temperature by decompression or the like. ) Contraction work can be performed.
  • a heater (20) heated by a heater, superheated steam or the like is formed on the outer periphery of the steam generator (6), and the heater (20) generates heat when heated by the heater (20).
  • the steam is led to the shrinkage tank (1) via the supply valve (7).
  • the shrink tub (1) has a charging lid (24) openable and airtight in an opening (22) at the upper end thereof through a packing (23).
  • a cooling coil (25) for condensing the solvent vapor is wound below the opening (22). Then, in the shrinking tank (1), the shrinking agent vapor after contact with the foamed resin (2) rises upward and is condensed and liquefied by the cooling coil (25). The liquefied contracting agent (10) is collected in a collecting groove (26) facing the lower side of the cooling coil (25), and the steam generating section is formed from the collecting groove (26). It can be recirculated to (6) and reheated in the steam generator (6) to be used as shrinkage agent vapor.
  • a screw extruder (15) is formed at the lower end of the shrinkage tank (1) through a discharge valve (13), and the screw extruder (15) is formed from the screw extruder (15). It is possible to extrude a recycled foam resin material of any shape and reuse it.
  • a screw extruder (15) is connected to the lower end of the shrinkage tank (1) via a discharge valve (13).
  • the force that allows the regenerated foamed resin material to be extruded from (15) In another different embodiment, without connecting the screw extruder (15), as shown in FIG.
  • a compressed gas such as carbon dioxide gas or nitrogen gas
  • the shrinked foamed resin (2) is pressurized and pushed out from the discharge port (19). It is possible to put out.
  • the method of introducing the compressed gas is as follows: a flow pipe (18) that connects the shrinkage tank (1) and the steam generation section (6) communicates with the shrinkage tank (1) and the steam supply valve (7).
  • a compressed gas generator (not shown) in the pit via a compressed gas introduction valve (38)
  • compressed gas is introduced into the shrinkage tank (1) from this compressed gas generator. It is possible.
  • the compressed gas introduction valve (38) is closed.
  • a third on-off valve (39 :) is provided between the shrinkage tank (1) and the cooling tank (31).
  • the third on-off valve (39) is opened during the contraction work, so that the flocculant vapor can be discharged from the contraction tank (1) to the cooling tank (31) side, and during the discharge work.
  • the closed state prevents compressed gas from flowing into the cooling tank (31).
  • a discharge pipe (41) is connected to a lower end of the shrink tank (1) through a discharge valve (13), and the discharge pipe (41) is connected to the cooling water (32). It is placed in the filled regeneration tank (42), and the molten foamed resin (2) is solidified so that it can be regenerated.
  • a cutout (43) is connected to the discharge pipe (41) so that the solidified shrinkable foam resin (2) can be cut to an appropriate size.
  • an appropriate nozzle (44) is connected to the above-mentioned cutter (43) to adjust the degree of solidification of the molten foamed resin (2), or to use cooling water.
  • the foamed resin (2) can be made into thread, cotton, plate, rod, etc. It can also be processed into a recycled resin (21) of an appropriate shape. By this processing, reprocessing in the next process is further facilitated.
  • the cutter section (43) provided with the nozzle (44) can be used by connecting to the screw extruder (15) of the first to third embodiments. is there. Further, the nozzle (44) and the shrinkage tank (1) may be directly connected via the discharge valve (13) without providing the cut part (43).
  • the compressed gas introduction valve (38) and the discharge valve (13) are closed, and the shrinkage agent vapor is released.
  • the supply valve (7) and the third on-off valve (39) are opened to circulate the shrinkage agent vapor to shrink the foamed resin (2). And the shrinking work is finished Then, the supply valve (7) and the third on-off valve (39) are closed.
  • the discharge valve (13) is opened to communicate the discharge port (19) with the discharge pipe (41), and the compressed gas introduction valve (38) is opened to compress the gas. The gas is introduced into the shrink tank (1).
  • the shrinkage tank (1) is pressurized by the pressure of the compressed gas, and the shrinkable foamed resin (2) having fluidity is discharged from the discharge port (19) through the discharge pipe (41). It is pushed out. Since the discharge pipe (41) is disposed in the regeneration tank (42), the shrinkable foamed resin (2) having fluidity in the discharge pipe (41) is supplied with cooling water (32). ) To cool and solidify. Then, due to the pressure of the compressed gas, the solid foamed resin (2) flows in the direction of the cut part (43), and the solid foamed resin (2) flows through the cut part (43). In addition, the foamed resin (2) is processed into an appropriate shape and size, thereby facilitating operations such as regeneration processing and transportation in the next process.
  • a thread, cotton, plate, rod, etc In the next step, it can be processed into a recycled resin (21) with a desired shape that is easy to handle. In this case, it is necessary to adjust the viscosity of the molten foamed resin (2) according to the processing shape. In addition, this processing operation can be performed using the pressure of the compressed gas, and a series of operations can be easily performed.
  • the foamed resin (2) is forcibly moved by the pressure of the compressed gas without providing a device such as a screw extruder (15) at the outlet (19). Then, it flows through the discharge pipe (41) in the direction of the cutter (43) and is discharged outside.
  • a regeneration tank (42) and a cut-out part (43) it is possible to process the waste into a state that can be easily regenerated at the same time as the discharge. .
  • By simply introducing compressed gas it is possible to perform the discharge and processing of shrinkable foamed resin (2) as part of the work, thereby simplifying the work process and improving work efficiency. Becomes
  • the steam generating part (6) is formed separately outside the shrinking tank (1), and the shrinking agent vaporized in the steam generating part (6) is shrunk.
  • a steam generating section (45) is provided at one side of the shrinking tank (1), and the shrinking tank (1) is provided.
  • the contraction agent vapor may be generated within the parentheses.
  • the steam generating section (45) is formed by attaching a panel containing a heater or the like through which superheated steam is circulated to the bottom of the shrink tank (1). Heating is possible so that a small amount of the contracting agent (10) is dropped on the part (45) and vaporized instantaneously. Further, the steam generating section (45) may be formed by using an appropriate existing apparatus as described in Japanese Patent Application Laid-Open No. 7-284601.
  • the contraction tank (1) can be supplied with the liquid contraction agent (10) from the atmospheric pressure tank (27) via a supply valve (7).
  • the liquid contracting agent (10) in the normal pressure tank (27) is supplied to the contracting tank (1) through the supply valve (7). ) Supply inside.
  • This shrinking agent (10) is dropped in small amounts from the upper end of the shrinking tank (1) onto the surface of the steam generating section (45) in order to facilitate evaporation.
  • the shrinkage agent (10) that has reached the steam generation section (45) is instantaneously vaporized by the heat of the steam generation section (45), so that it is located at one side of the shrinkage tank (1). Is filled with contractile vapor.
  • the shrink tank (1) raises the internal temperature by flowing heated steam through the flow section (12) of the outer peripheral wall (11), the heat also evaporates the shrink agent (10). Is promoted.
  • the shrinking agent vapor shrinks the foamed resin (2) in the shrinking tank (1) as in the above four embodiments. Then, the condensing agent vapor is led to the condensing section (9) through the distribution pipe (33) and condensed, and the condensed condensing agent (10) is condensed into the condensate tank (16). ) And the atmospheric pressure tank (27), and then supplied again into the shrink tank (1) via the flow pipe (18).
  • the inside of the shrinkage tank (1) is formed by the steam generation section (45) provided inside the shrinkage tank (1) and the heating steam circulated to the external circulation section (12). While keeping the temperature, the shrinking agent (10) is evaporated.
  • the shrinkage is performed only by the heating means by the steam generating section (45). It is not necessary to provide a heat retention means by generating a heating agent and generating a heating agent vapor.
  • the heating means of the circulation section (12) may be used as the steam generation source without providing a separate heat source for generating steam inside the shrinkage tank (1).
  • the present invention shrinks foamed resins such as foamed polystyrene and foamed polyurethane used as packaging materials, and transports, stores, and recycles these foamed resins that are regarded as waste. It facilitates
  • the present invention involves contacting the shrinkage agent vapor with the foamed resin, it is possible to shrink a large amount of the foamed resin with a small amount of the shrinkage agent. Allows shrinkage.
  • the shrinkage agent vapor that has come into contact with the foamed resin is recovered in the same shrinkage tank, and is immediately condensed and liquefied in the condensing section connected to the shrinkage tank, so that it can be reused. Therefore, it is not necessary to perform the work of separating the shrinking resin and the foamed resin that has shrunk again after the shrinkage as in the related art, thereby enabling the inexpensive and quick shrinkage of the foamed resin.
  • the shrinking agent vapor is brought into contact with the foamed resin, a large amount of the shrinking agent is not mixed into the foamed resin, and high-quality foamed resin can be regenerated.
  • volatilization of the shrinkage agent vapor adhering to the foamed resin can be promoted, and a higher quality foamed resin can be recovered. It is possible to make money.

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  • Chemical Kinetics & Catalysis (AREA)
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  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
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  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Un agent rétrécissant sous forme de vapeur et une résine moussée sont mises en contact l'un avec l'autre, pour entraîner le rétrécissement d'une grande quantité de la résine avec une petite quantité de l'agent. En outre, l'agent rétrécissant sous forme de vapeur, en contact avec la résine moussée, est récupéré dans le même récipient de rétrécissement, pour être immédiatement condensé et liquéfié dans une section de condensation, pour permettre sa réutilisation, et, ainsi, il n'est pas nécessaire de séparer l'agent rétrécissant et la résine moussée l'un de l'autre dans un processus séparé. L'agent rétrécissant sous forme de vapeur et la résine moussée (2) sont mis en contact l'un avec l'autre dans le récipient de rétrécissement (1), pour entraîner le rétrécissement de la résine (2), et l'agent rétrécissant sous forme de vapeur se trouvant dans le récipient de rétrécissement (1) est introduit dans la section de condensation (9) pour être condensé et liquéfié. L'agent rétrécissant (10) ainsi liquéfié est acheminé jusqu'à une section génératrice de vapeur (6) en vue de sa réévaporation et il est alors converti en vapeur.
PCT/JP1997/000475 1996-03-01 1997-02-21 Procede pour realiser le retrecissement d'une resine moussee et appareil prevu a cet effet WO1997031972A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP8/44869 1996-03-01
JP4486996 1996-03-01
JP9/35830 1997-02-20
JP3583097A JPH09291170A (ja) 1996-03-01 1997-02-20 発泡樹脂の収縮方法及びその装置

Publications (1)

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WO1997031972A1 true WO1997031972A1 (fr) 1997-09-04

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PCT/JP1997/000475 WO1997031972A1 (fr) 1996-03-01 1997-02-21 Procede pour realiser le retrecissement d'une resine moussee et appareil prevu a cet effet

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JP (1) JPH09291170A (fr)
WO (1) WO1997031972A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004217676A (ja) * 2000-09-14 2004-08-05 Matsushita Electric Ind Co Ltd 発泡性樹脂の減容化方法及び発泡性樹脂の減容化装置並びに発泡性樹脂のリサイクル方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52117962A (en) * 1976-03-31 1977-10-03 Hitachi Chemical Co Ltd Treatment of polystyrene foam
JPS6020937A (ja) * 1983-07-13 1985-02-02 Asahi Chem Ind Co Ltd 溶剤蒸気による表面処理方法及びその装置
JPH0632938A (ja) * 1992-07-14 1994-02-08 Nippon Plant Gijutsu Kk スチレン系合成樹脂からなるプラスチック廃棄物の改良リサイクル法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52117962A (en) * 1976-03-31 1977-10-03 Hitachi Chemical Co Ltd Treatment of polystyrene foam
JPS6020937A (ja) * 1983-07-13 1985-02-02 Asahi Chem Ind Co Ltd 溶剤蒸気による表面処理方法及びその装置
JPH0632938A (ja) * 1992-07-14 1994-02-08 Nippon Plant Gijutsu Kk スチレン系合成樹脂からなるプラスチック廃棄物の改良リサイクル法

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