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WO1996003230A1 - Procede de preparation d'emballages - Google Patents

Procede de preparation d'emballages Download PDF

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Publication number
WO1996003230A1
WO1996003230A1 PCT/EP1994/002483 EP9402483W WO9603230A1 WO 1996003230 A1 WO1996003230 A1 WO 1996003230A1 EP 9402483 W EP9402483 W EP 9402483W WO 9603230 A1 WO9603230 A1 WO 9603230A1
Authority
WO
WIPO (PCT)
Prior art keywords
residues
reactive
packaging
temperature
zone
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/EP1994/002483
Other languages
German (de)
English (en)
Inventor
Mathias Pauls
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rathor AG
Original Assignee
Rathor AG
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 Rathor AG filed Critical Rathor AG
Priority to PCT/EP1994/002483 priority Critical patent/WO1996003230A1/fr
Priority to AU74961/94A priority patent/AU7496194A/en
Priority to CA002196088A priority patent/CA2196088A1/fr
Priority to AU31646/95A priority patent/AU3164695A/en
Priority to PCT/EP1995/002907 priority patent/WO1996003231A1/fr
Priority to EP95927707A priority patent/EP0773842B1/fr
Priority to DE59504999T priority patent/DE59504999D1/de
Priority to CA 2196177 priority patent/CA2196177A1/fr
Priority to EP95930423A priority patent/EP0776245A1/fr
Priority to AU33815/95A priority patent/AU3381595A/en
Priority to PCT/EP1995/003010 priority patent/WO1996003204A1/fr
Publication of WO1996003230A1 publication Critical patent/WO1996003230A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B29B17/0404—Disintegrating plastics, e.g. by milling to powder
    • B29B17/0408—Disintegrating plastics, e.g. by milling to powder using cryogenic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
    • B09B3/35—Shredding, crushing or cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/75—Plastic waste
    • B09B2101/78—Plastic waste containing foamed plastics, e.g. polystyrol
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/02—Separating plastics from other materials
    • B29B2017/0213—Specific separating techniques
    • B29B2017/0217—Mechanical separating techniques; devices therefor
    • B29B2017/0227—Vibratory or shaking tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/02—Aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • B29K2705/08—Transition metals
    • B29K2705/12—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/12—Paper, e.g. cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/20—Flexible squeeze tubes, e.g. for cosmetics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/717—Cans, tins
    • 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
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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 invention relates to a process for the preparation of packaging containing reactive residues, in particular of pressure cans for the production of polyurethane foam with propellant gases.
  • the packaging materials are obtained and the residues contained therein are converted into reusable products.
  • Residual packaging such as occurs in large quantities, for example in the form of completely or partially emptied aerosol cans, is increasingly becoming a disposal problem.
  • a deposit on landfills is prohibited for reasons of environmental protection, since the residues contained therein can get into the atmosphere, into the ground or into the groundwater and can cause considerable damage there.
  • combustion which is often only incomplete, in particular in the case of chemical-technical products, and generates large amounts of pollutants which, if at all, can only be bound by expensive measures.
  • incineration leads to a significant reduction in the volume of waste, but does not necessarily lead to a solution to the environmental impact.
  • Polyurethane foams have found widespread use in many fields. In particular in construction, they are widely used for sealing and insulating, as well as in other technical fields.
  • polyurethane foams are applied from aerosol cans that contain a polyurethane prepolymer together with the required blowing agent and any additives that may also be required.
  • aerosol cans are under pressure and cannot and must not be reused after use. On the other hand, they represent problem waste that is not accessible for normal disposal.
  • aerosol cans from older production in particular regularly contain fluorinated chlorinated hydrocarbons, which should not be released into the atmosphere. More recent aerosol cans contain flammable propellants, such as propane, butane or dimethyl ether, which form explosive mixtures with air.
  • the cans have a different filling state, from old cans with practically complete prepolymer filling, which can no longer be dispensed due to a blocked valve, to practically completely emptied cans with only the edges residual of prepolymer in uncrosslinked to crosslinked! Condition is enough.
  • the invention is therefore based on the object of providing a method by which packaging, for example containers which contain polyurethane prepolymer, in particular for foam production, but also for adhesive purposes, is prepared together with solvents and / or propellant gases, and the valuable materials contained therein are obtained can be used without the uncontrolled release of ingredients which are harmful to health and the environment and without the process sequence being burdened by propellant gases released from the embal layers.
  • the method is intended to meet the requirements for occupational safety and, in particular, to convert reactive residues still contained in the packaging into a form suitable for direct further processing.
  • this object is achieved with a method of the type mentioned at the outset, in which the packaging is introduced into a cold zone and cooled to such an extent that residues therein are solidified, the packaging is then comminuted in a cooled state, after which the comminuted packaging is placed in a the fraction containing the reactive residues and at least one further fraction are separated, the fraction containing residues is introduced into a mixing zone into which an agent reactive with the residues is introduced at the same time, optionally together with a catalyst, where the temperature in the mixing zone is kept below the softening temperature of the residues, such as the reactive agent, and the mixture thus obtained of the fraction containing residues and reactive agent and, if appropriate, catalyst analyzer is brought to a temperature sufficient for the reaction in a reaction zone and allowed to react completely.
  • the method according to the invention it is possible to open and further process packaging in a completely harmless manner.
  • the various materials contained in the packaging can be separated in a safe manner.
  • the reactive residues for example in the case of pressure cans for the production of polyurethane foam-containing prepolymers containing isocyanate and propellant gases, are treated in a manner which is safe from a safety point of view. Freezing the ingredients contained in the packaging does not result in an increase in pressure in the process or in undesirable reactions between reactive components. At the temperatures prevailing in the process, the presence of water is also harmless. The latter two points are important in the treatment of isocyanate-containing products if, for example, water is carried into the process due to damaged packaging.
  • reactive second components for example glycols
  • ZK foams so-called ZK foams
  • the method according to the invention is suitable for treating both pressure cans for 1-component and 2-component foams as well as transitional forms between the two at the same time.
  • the packs for example pressure cans
  • the packs are first introduced into a cold zone and cooled therein to such an extent that the residues therein, including those of low boiling point Solidify propellants.
  • temperatures of less than -80 ° C to -100 ° C are sufficient for this;
  • the introduction into the cold zone is expediently carried out with a cellular wheel blow-through lock, with which the packaging to be introduced is introduced into a guide cage running in the cooling medium.
  • the packaging is then passed a sufficient distance through the cooling medium in order to achieve complete freezing.
  • the packaging After reaching the desired temperature, generally the temperature of liquid nitrogen, the packaging is led into the comminution zone, where it is comminuted in the cold state.
  • the temperatures here should expediently be below -80 ⁇ C to -100 ⁇ C; if necessary, liquid nitrogen or cold gaseous nitrogen must be injected.
  • the comminution is expediently carried out in a hammer mill that works against a sieve.
  • a shaking and flexing effect is achieved which - in addition to the comminution to a desired grain size - brings about a separation of the different materials: metal, paper, plastic and contents.
  • the packaging materials - metal, paper and plastic - can be separated extraordinarily well from the ingredients - reactive residues and solvents / blowing agents in powder form. sen, the ingredients being obtained as a fine powder.
  • the crushed packaging is separated into at least two fractions, one of which contains the reactive residues, including the propellant gas, in the solid state.
  • a screen is expediently provided in this separation stage, expediently a vibrating screen through which the fine constituents, predominantly reactive residues and propellants, fall. Metal parts are separated using magnetic methods, larger plastic parts and scraps of paper are screened off on the vibrating screen.
  • the frozen constituents from reactive residues and propellant gases pass from the separation zone into a mixing zone, into which an agent reactive with the residues is introduced at the same time. Also in this mixing zone prevail Temperatu ⁇ ren of less than -80 ⁇ C to -100 ° C to the ge frozen state of the materials introduced to ensure and the injected reactive agent immediately to solidify to a fine powder. The result of this is that a uniform mixture of ingredients in powder form and reactive agent is formed, which, however, cannot react due to the prevailing temperature conditions.
  • the temperatures in the mixing zone are in each case below the melting point of both the residues and the reactive agent.
  • a spray tower into which the frozen ingredients fall from above, is expediently used as the mixing zone.
  • the reactive agent is injected into this powder stream from side nozzles. sprayed, expediently together with cold gaseous nitrogen, in order to ensure the required low temperatures. Pre-cooling of the reactive eye is advisable, but the sprayability must remain guaranteed.
  • the powdery mixture of ingredients and reactive agent and, if appropriate, catalyst is then passed into a reaction zone which, for example, consists of a conveyor belt moving continuously under the mixing zone.
  • the powder collecting here is then brought to a temperature sufficient for the reaction Any solvents or propellant gases present evaporate on this occasion and are condensed at a suitable point, which is not a problem when using nitrogen as a refrigerant.
  • the conveyor belt can have lateral limitations
  • To separate the reaction product from the conveyor belt it is possible to provide separating agents, for example suitable coatings or release paper, and the heating in the reaction zone is expediently carried out using microwaves, which rapidly and directly heat the P Effect ulver material from the inside, so that there is a uniform degassing.
  • further processing and treatment zones can be provided, and finally a lock for discharging the fully reacted material.
  • the method according to the invention is particularly suitable for processing residue-containing polyurethane foam pressure cans.
  • the reactive agent is in particular a compound containing hydroxyl groups, for example water, ethylene glycol, propylene glycol, glycerol, oligomers and mixtures thereof and derivatives thereof. Ethylene glycol is preferred.
  • insulation boards can be produced continuously, the propellant gases contained in the powder produced in the mixing zone promoting foam formation.
  • additives for example cellulose-containing materials.
  • FIG. 1 schematically shows an embodiment of a system for carrying out the method according to the invention
  • FIG. 2 shows the entrance area of the system according to FIG. 1;
  • FIG. 3 shows the conveying, comminuting and sorting part of the plant according to FIG. 1;
  • FIG. 4 shows the mixing and reaction zone of the plant according to FIG. 1;
  • Fig. 7 the guide of Fig. 6 in cross section.
  • the illustration of an embodiment of the processing system according to the invention shown in the figure has an entrance lock 1, to which the pressure cans 13 to be treated are fed via a conveyor and sorting belt 11 (FIG. 5).
  • the entrance lock is preferably designed as a cellular wheel blow-through lock, in the chambers 12 of which the cans 13 fall from above via a feed funnel 14 (FIG. 2).
  • the cans By rotating the cell wheel 1, the cans enter the lower region of the lock and are laterally ejected from the line 15 with the aid of gaseous nitrogen GAN.
  • the star feeder turns in a top ⁇ open, gas-tight container from which it can be aufschlagt be ⁇ in its lower region with a side un ⁇ ter pressurized gaseous nitrogen GAN, so that the pressure cell is befindli ⁇ che 13 can be ejected into a guide system 21 on the opposite side.
  • the nitrogen supply via line 15 is preferably gaseous nitrogen from the Cold bath 2 ensured. It goes without saying that the rotational speed of the cellular wheel 1 and the pressure surges from the nitrogen line 15 for ejecting the pressure cans from the cellular wheel are coordinated with one another.
  • the cellular wheel has a sensor marked with M.
  • the cans pass from the cell wheel via a guide 21 into the cold bath 2, which is filled with liquid nitrogen.
  • the guide 21 expediently consists of an elongated basket construction which is open on all sides and which enables the unhindered entry of liquid nitrogen and exit of gaseous nitrogen. Details of the guide 21 and the transport device 23 for transporting the pressure sockets 13 are described in more detail below in connection with FIGS. 4 and 5.
  • the pressure cans 13 are cooled to the bath temperature.
  • the cage structure of the guide 21 ensures the free access of the refrigerant and the rapid removal of the gaseous nitrogen generated. Gaseous nitrogen is drawn off from the bath area via line 16 with the aid of a fan 17.
  • the length of the guide 21 and the Transport ⁇ speed are adjusted so that the Druck ⁇ cans 13 also at complete rest panel to a sufficiently low temperature of at least - 80 ⁇ C to -100 C ⁇ are cooled.
  • the pressure sockets 13 are transported in the guide 21 with the aid of the transport device 23, which expediently consists of a conveyor belt 25 which is guided in a circle and has transport gates protruding therefrom. beln 26, which engage from above in the guide 21 and push the cans 13 guided in front of it. Transport rollers 27 ensure precise guidance of the transport forks 26.
  • the forks 26 are arranged on the conveyor belt 25 at intervals which are matched to the size of the pressure cans 13 to be transported.
  • a measuring station M is used to monitor the transport speed and to coordinate it with the feed speed of the pressure cans 13.
  • the pressure cans 13 pass from the guide 21 into the conveying device 3 (FIG. 3) in the form of a revolving conveyor belt 31 which has transport segments which are matched to the size of the cans 13.
  • the conveying device 3 is preferably designed as a steep conveyor which receives the pressure cans 13 in the segments formed by transport forks 33 arranged at regular intervals and releases them overhead into the comminution device 4.
  • the conveyor belt is guided over rollers 32 provided with a measuring station M for monitoring and controlling the conveying speed.
  • the crushing device 4 consists of a shredder or preferably a hammer mill 41.
  • the hammer mill 41 preferably works against a sieve in order to ensure a certain grain size of the crushed material.
  • the sieve 42 has a flexing effect, which has a positive effect on the separation of the contents, which are embrittled by the cold, from the metal of the jacket and existing plastic parts of the valve.
  • liquid nitrogen LIN may be added via line 43 when the temperature control TK reports an impermissible temperature increase.
  • the working speed is controlled and controlled via the sensor M. Gaseous nitrogen is discharged via the line 44 and recycled or blown off via a valve 45.
  • the comminuted material passes from the comminution 4 into the sorting device 5.
  • This initially consists of a vibrating sieve 51, on which the coarse and the fine parts are separated.
  • Coarse particles are mainly the comminuted sheets of the compressed gas container, which are shaken off on the inclined sieve 51 and are discharged from the process via a lock, not shown.
  • Powdery ingredients and fine fractions of the pressure can body and the valve mechanism pass through the vibrating screen 51 onto a first magnetic separator 52, which separates the remaining iron and aluminum components from plastic particles and ingredients.
  • Magnetic components are first separated on the first magnetic separator 52 and placed on a first conveyor belt 53, which also receives the metal and plastic parts shaken off the screen 51.
  • a second conveyor belt 54 receives plastics, ingredients and non-magnetic metal parts, which are separated into metallic and non-metallic components via a second magnetic separator 55 coupled to the conveyor belt.
  • the metallic components get on the first conveyor belt 53, the non-metallic components are fed directly into the spray tower 6.
  • Cold gaseous nitrogen can be supplied via line 56 if the temperature control TIC reports an impermissible temperature increase.
  • Measuring sensors M check the speed of all moving parts of the separation system 5.
  • the powdery ingredients and plastic parts reaching the spray tower 6 (FIG. 4), which have a temperature of at most -80 ° C. to -100 ° C., so that propellant gases contained therein are also present in a solid state with reaction medium sprayed in via spray line 6 in the upper region of spray tower 6 and optionally catalyst.
  • the reaction medium preferably ethylene glycol, is in the liquid state in the storage tank 62, the catalyst in the storage tank 63. Dosing stations are assigned to both tanks.
  • Reaction medium from the container 62 and catalyst from the container 63 are injected via the line 61 into the spray tower 6 in a metered ratio to the reactive constituents, it being possible for a precooling section to be provided in the course of the supply line 61 in order to divide the materials onto a cool to acceptable temperature (above the melting point).
  • the spray material solidifies within the spray tower, even at the temperatures of less than -80 ° C to -100 ° C.
  • additional cooling medium for example liquid nitrogen LIN via line 64 or gaseous nitrogen via line 65, if the temperature control TIC reports a need. It is It is expedient to inject the cooling medium in the lower regions of the spray tower in order to ensure an additional swirling and mixing of reactive compound, catalyst and reactive can content through the cold nitrogen rising in the spray tower 6.
  • reaction space 7 The mixture of reactive can content, reactive compound and catalyst in powder form reaches the reaction space 7 from the spray tower 6.
  • a reaction belt 71 is arranged inside the reaction space 7, which takes up the falling material from the spray tower 6 and into the actual one Reaction zone 72 leads where the reaction is induced by heat.
  • heating elements 73 are arranged above the conveyor belt 71, which use microwave or infrared rays to heat the reaction material on the conveyor belt 71 to a temperature sufficient for the reaction, for example room temperature or above.
  • reaction material 74 e.g. H. the mixture of reactive can contents, reactive compound and catalyst to prevent the conveyor belt 71
  • the release film can be used several times if necessary.
  • reaction material reacts on the conveyor belt 71 to the respectively desired product.
  • blowing agent and adsorbent nitrogen of the refrigerant still contained in the mixture from the spray tower are released and sucked off via line 77 and fed to a blowing agent separation (not shown) and extraction.
  • the blowing agent escapes from the reac- tion material 74 causes a partial foaming of the reaction material, which is not undesirable for certain uses.
  • Nitrogen lines 81 and 82 regulate the supply of protective gas in the lock area, nitrogen being expediently used as the protective gas, but this need not be cooled. Further nitrogen lines 83 and 84 in the area of the entry and exit of the separating film 75 prevent the entry of oxygen into the system in this area. The use of cooling nitrogen is not necessary here either.
  • the method according to the invention is carried out in a cold and heat insulated system.
  • the entry of oxygen must also be prevented in order to prevent liquid oxygen from condensing into the cooling bath 2.
  • the gas guidance that the entire process is carried out into the spray tower 6 at temperatures at which propellant gases are present in a solid state. This allows propellant gases to be drawn off centrally via the suction line 77 in the reaction chamber 7 and for extraction feed.
  • the fully reacted / hardened polyurethane material, which exits the process from the product lock 8, can be used as granules for any further use.
  • the use for insulating materials and in composite materials comes into question. 5 shows details of the lock system at the entrance to the method, the cellular wheel blow-through lock being rotated by 90 ° in relation to the illustration in FIGS. 1 and 2.
  • the pressurized cans intended for the process with the polyurethane prepolymer residues 13 are introduced into the cells 12 of the cellular wheel blow-through lock 1 via the conveyor and sorting belt 11.
  • a feed hopper 14, under which the lock rotates away, ensures the precise insertion of the nozzles 13.
  • the conveyor and sorting belt 11 expediently has ribs or forks 15 which separate the cans 13 transported on the conveyor belt from one another.
  • the cycle of dispensing the cans can be matched precisely to the transport speed of the rotary valve 1 and the transport cycle in the guide 21 of the cooling bath 2.
  • the specification of a cycle also allows the cans 13 to be brought out of the sluice 1 with the aid of pressurized nitrogen through the line 15 (FIG. 2).
  • the blow-through sluice 1 opens at its lower end (opposite the feed hopper 14) into the guide 21 into which the pressure sockets slide and with the help of the pressure surge from the line 15 in the direction of the transport device 23 are expelled.
  • 6 and 7 show details of the guide 21 and the transport device 23 for transporting the pressure sockets 13 within the guide 21.
  • the guide 21 has an overall elongated, cage-like or basket-like structure.
  • the leadership essentially consists of parallel guide rails 22 which leave enough space for the entry of liquid nitrogen and the exit of evaporated nitrogen.
  • the guide rails 22 are held together on the outside by fixing rings 27 such that the relative position to one another is fixed.
  • the fixing rings encompass the entire guide 21 with the exception of the upper end, where the space between two guide rails 22 remains free, so that a transport fork 26 or the like can engage from above and push the cans 13 located in the guide 21 through the guide.
  • the result is an elongated cage made of rails 22 guided in parallel and encircling fixing rings 27, which in the upper region leaves a free space for the movement of the transport fork 26 over its entire length.
  • the size of the cage is matched to the size of the pressure cans and is selected so that the cans cannot become jammed when they are passed through.
  • the can 13 is transported with the bottom first in the direction of the arrow, the fork 26 comprises the valve region 18.
  • the transport forks 26 are located on a conveyor belt 25 which, via a correspondingly arranged system of transport rollers 27, conveys the cans through the guide 21 to the conveyor belt 31, where they fall out of the guide 21 and from the transport elements 32 of the conveyor belt 31 be included. From the end of the guide 21, the conveyor belt 25 is moved back over the bath 2 in the direction of the rotary valve 1, where the gates Bails 26 engage in the guide 21 again at a designated location and transport the pressure cans located in the guide through the bath 2. It goes without saying that the entire guide 21 runs in the area of the actual cooling section in the cooling bath 2 in such a way that liquid nitrogen is washed around the cans on all sides.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention concerne un procédé de préparation d'emballages contenant des résidus réactifs provenant notamment de récipients sous pression (13) pour produire des mousses polyuréthane avec des gaz propulseurs. Les emballages sont introduits dans une zone réfrigérée (2) et sont refroidis jusqu'à ce que les résidus qu'ils contiennent soient solidifiés. Lesdits emballages sont ensuite broyés (4) à l'état refroidi. Les emballages broyés sont répartis en une fraction contenant les résidus réactifs et en au moins une autre fraction. La fraction contenant les résidus est introduite dans une zone de mélange (6) dans laquelle est introduit simultanément un agent pouvant réagir avec les résidus, éventuellement conjointement avec un catalyseur. La température régnant dans la zone de mélange est maintenue en dessous de la température de ramollissement des résidus et de l'agent. Le mélange constitué de la fraction contenant les résidus, de l'agent réactif et éventuellement du catalyseur est amené dans la zone de réaction, porté à une température suffisante pour permettre une réaction, puis on le laisse réagir.
PCT/EP1994/002483 1994-07-28 1994-07-28 Procede de preparation d'emballages Ceased WO1996003230A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
PCT/EP1994/002483 WO1996003230A1 (fr) 1994-07-28 1994-07-28 Procede de preparation d'emballages
AU74961/94A AU7496194A (en) 1994-07-28 1994-07-28 Process for preparing packages
CA002196088A CA2196088A1 (fr) 1994-07-28 1995-07-22 Procede de traitement d'emballages
AU31646/95A AU3164695A (en) 1994-07-28 1995-07-22 Method of processing packaging
PCT/EP1995/002907 WO1996003231A1 (fr) 1994-07-28 1995-07-22 Procede de traitement d'emballages
EP95927707A EP0773842B1 (fr) 1994-07-28 1995-07-22 Procede de traitement d'emballages
DE59504999T DE59504999D1 (de) 1994-07-28 1995-07-22 Verfahren zum aufbereiten von emballagen
CA 2196177 CA2196177A1 (fr) 1994-07-28 1995-07-28 Procede de production de melanges sensiblement homogenes
EP95930423A EP0776245A1 (fr) 1994-07-28 1995-07-28 Procede de production de melanges sensiblement homogenes
AU33815/95A AU3381595A (en) 1994-07-28 1995-07-28 Process for the production of substantially homogenous mixtures
PCT/EP1995/003010 WO1996003204A1 (fr) 1994-07-28 1995-07-28 Procede de production de melanges sensiblement homogenes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1994/002483 WO1996003230A1 (fr) 1994-07-28 1994-07-28 Procede de preparation d'emballages

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/776,485 Continuation US6013685A (en) 1995-07-22 1995-07-22 Process for recycling packings

Publications (1)

Publication Number Publication Date
WO1996003230A1 true WO1996003230A1 (fr) 1996-02-08

Family

ID=8165873

Family Applications (3)

Application Number Title Priority Date Filing Date
PCT/EP1994/002483 Ceased WO1996003230A1 (fr) 1994-07-28 1994-07-28 Procede de preparation d'emballages
PCT/EP1995/002907 Ceased WO1996003231A1 (fr) 1994-07-28 1995-07-22 Procede de traitement d'emballages
PCT/EP1995/003010 Ceased WO1996003204A1 (fr) 1994-07-28 1995-07-28 Procede de production de melanges sensiblement homogenes

Family Applications After (2)

Application Number Title Priority Date Filing Date
PCT/EP1995/002907 Ceased WO1996003231A1 (fr) 1994-07-28 1995-07-22 Procede de traitement d'emballages
PCT/EP1995/003010 Ceased WO1996003204A1 (fr) 1994-07-28 1995-07-28 Procede de production de melanges sensiblement homogenes

Country Status (5)

Country Link
EP (1) EP0776245A1 (fr)
AU (3) AU7496194A (fr)
CA (2) CA2196088A1 (fr)
DE (1) DE59504999D1 (fr)
WO (3) WO1996003230A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1060962A2 (fr) 1999-06-18 2000-12-20 Sungwoo Corporation Mécanisme à glissement pour enrouleur de ceinture de sécurité
WO2001040058A3 (fr) * 1999-12-03 2001-10-18 Pu Dosen Recycling Gmbh & Co B Procede et dispositif pour evacuer de maniere controlee au moins un constituant du contenu d'un emballage contenant du gaz comprime

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455115A2 (fr) * 1990-04-30 1991-11-06 Rolf Emil Roland Procédé et installation pour la récupération des éléments à partir de boîtes contenant des substances polluantes, en particulier à partir d'aérosols contenant du gaz propulseur
NL9001596A (nl) * 1990-07-13 1992-02-03 Demaco B V Werkwijze en inrichting voor het van elkaar scheiden van aan elkaar gehechte lagen van verschillende materialen.
WO1993022077A1 (fr) * 1992-04-23 1993-11-11 Rathor Ag Procede de traitement d'emballage contenant des residus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1960682A1 (de) * 1969-12-03 1971-06-09 Alfred Gerhard Kombinierte Mahl- und Mischanlage
DE2035775A1 (en) * 1970-07-18 1972-03-23 Texaco Ag Continuously mixing liquids - esp for producing condensation resins with avoidance of b stage formation
US4350803A (en) * 1979-12-27 1982-09-21 Liquid Control Incorporated Reaction arrestment mixer head and mixing process
FR2645771B1 (fr) * 1989-04-17 1991-06-14 Air Liquide Procede de restructuration d'un ensemble de poudres fines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455115A2 (fr) * 1990-04-30 1991-11-06 Rolf Emil Roland Procédé et installation pour la récupération des éléments à partir de boîtes contenant des substances polluantes, en particulier à partir d'aérosols contenant du gaz propulseur
NL9001596A (nl) * 1990-07-13 1992-02-03 Demaco B V Werkwijze en inrichting voor het van elkaar scheiden van aan elkaar gehechte lagen van verschillende materialen.
WO1993022077A1 (fr) * 1992-04-23 1993-11-11 Rathor Ag Procede de traitement d'emballage contenant des residus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1060962A2 (fr) 1999-06-18 2000-12-20 Sungwoo Corporation Mécanisme à glissement pour enrouleur de ceinture de sécurité
US6237869B1 (en) 1999-06-18 2001-05-29 Delphi Automotive Systems Sungwoo Corporation Skid mechanism of safety seat belt retractor
WO2001040058A3 (fr) * 1999-12-03 2001-10-18 Pu Dosen Recycling Gmbh & Co B Procede et dispositif pour evacuer de maniere controlee au moins un constituant du contenu d'un emballage contenant du gaz comprime

Also Published As

Publication number Publication date
WO1996003231A1 (fr) 1996-02-08
CA2196088A1 (fr) 1996-02-08
AU3381595A (en) 1996-02-22
AU3164695A (en) 1996-02-22
EP0776245A1 (fr) 1997-06-04
AU7496194A (en) 1996-02-22
WO1996003204A1 (fr) 1996-02-08
DE59504999D1 (de) 1999-03-11
CA2196177A1 (fr) 1996-02-08

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