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WO2012037932A2 - Procédé pour produire des objets tridimensionnels par intrusion sous pression à partir de déchets plastiques recyclés - Google Patents

Procédé pour produire des objets tridimensionnels par intrusion sous pression à partir de déchets plastiques recyclés Download PDF

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Publication number
WO2012037932A2
WO2012037932A2 PCT/DE2011/075183 DE2011075183W WO2012037932A2 WO 2012037932 A2 WO2012037932 A2 WO 2012037932A2 DE 2011075183 W DE2011075183 W DE 2011075183W WO 2012037932 A2 WO2012037932 A2 WO 2012037932A2
Authority
WO
WIPO (PCT)
Prior art keywords
recycled plastic
recycled
mold
polyethylene
filling
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/DE2011/075183
Other languages
German (de)
English (en)
Other versions
WO2012037932A3 (fr
Inventor
Klaus Seubert
Lutz Elges
Sebastian Wagner
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.)
RELUMA GmbH
Original Assignee
RELUMA GmbH
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
Priority claimed from DE201110052015 external-priority patent/DE102011052015A1/de
Application filed by RELUMA GmbH filed Critical RELUMA GmbH
Publication of WO2012037932A2 publication Critical patent/WO2012037932A2/fr
Publication of WO2012037932A3 publication Critical patent/WO2012037932A3/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
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • B29B17/0042—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0625—LLDPE, i.e. linear low density polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/0633—LDPE, i.e. low density polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • 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
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • 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 pressure-intrusion process for the production of three-dimensional objects, which are produced predominantly from recycled plastic waste.
  • the invention relates to the design of the method with the aim of producing largely vacuole-free three-dimensional objects.
  • the goal is to produce voluminous or thick-walled components made of plastics as far as possible vacuole-free by means of thermal molding processes.
  • plastics are recycled through recycling systems after their intended use. These are mainly the so-called bulk plastics, which were used for packaging, films, containers and the like and are disposed of after use over yellow tons or sacks.
  • a not insignificant Proportion of recycled plastic materials also relates to residues from the production of technical plastic parts, which may at least partly also consist of plastics such as polyethylene, polypropylene and polystyrene. It is known that recycled plastic waste of this type is difficult to access for further processing.
  • Such type recycled plastic materials are also subject to impurities that impede further processing or exclude completely.
  • Such impurities can be metallic constituents, adhering residues of packaging contents, dirt or foreign bodies, such as stones, soil or foreign substances.
  • the most essential by-product is water that is contained in a high percentage of the blend of recycled plastic pulp with residual residues of ingredients, precipitates, the remainder of cleaning operations, and the like. With regard to the water content, no limit value results from the product specifications mentioned above, since these are based on the solid fractions.
  • the recycled plastic waste is adversely affected by adherent moisture on the one hand and by the mixing ratio of the various plastics on the other hand.
  • the dehumidification is to be achieved in that the extruder is preceded by a further extruder, which plasticizes the molding composition for a first time and then conveys it into a relaxation region.
  • a predried molding compound is to be plasticized in the upstream extruder and immediately pressed through a filter screen, with the molding compound subsequently being pressed in several strands into a dropping step via a multi-hole die.
  • the then strand-like molding composition should dissolve into individual drops with a large surface. About a chute, these drop-shaped particles are to fall into the feed opening of the downstream extruder and a blown film can be generated with this and the now dehumidified and solids-free molding compound.
  • This procedure initially involves washing the plastic waste after it has been crushed. At the same time, the floating fraction is to be removed during the washing process so that ultimately only buoyant plastic particles of HDPE, LDPE, LLDPE and PP are present in the starting material to be processed.
  • Washing necessarily requires a downstream drying process. This alone makes this process more expensive because of the considerable amount of energy to be used.
  • the method described above may be suitable for producing intrusion moldings instead of blown films.
  • the preparation of the starting material always makes the application of this method un- economically. It can no longer be done climate-friendly production of intrusive moldings.
  • a major disadvantage of this method is that neither the filling of the mold nor the subsequent cooling process of the molded part in the mold, the formation of the vacuoles is controllable.
  • vacuoles should be prevented in that the casting molds are subjected to compressed air and the molding material must therefore be filled against the internal pressure in the mold.
  • vacuoles in the moldings to be cast can be avoided only to a limited extent. There is therefore a need to apply methods in the use of the proportion of moisture in the molding composition significantly reduced and therefore the probability of the formation of vacuoles by gaseous admixtures is reduced from the outset.
  • the plasticates produced from the recycled plastic materials in the extruder must be able to completely fill both large-volume and pressure-intrusion molds provided with deposits and / or mold undercuts without defects or vacuoles being able to arise.
  • Recycled waste plastics are waste plastics which consist of a collection system or of industrial plastic wastes and contain a high proportion of polyolefins.
  • the recycled plastic waste can comply with the product specifications 310, 321, 322, 350 and 352 of the recycling industry and contain about 90 percent by weight mixed plastic, especially polyethylene, polypropylene and polystyrene.
  • Recyclate plastic compound - is a recycled mixture of recycled plastic waste.
  • Plasticized molding compound mixture is a recycled plastics material heated above the plasticizing temperature and, in extruders, agglomerators, pelletizers, heating tunnels or similar devices, at least modifying the initial shape of the particles in a changing manner.
  • Druckintrusionsform- is a negative mold with the ability to connect to a filler neck, which is filled for the purpose of filling with the plasticized molding composition, then shut off against the filler and is subjected to a longer cooling cycle, at the end of the Entform- the object is.
  • recycled waste plastics which are to be processed into new three-dimensional objects by means of a pressure-intrusion process, are prepared in such a way that optimum results are achieved when plasticizing the molding material mixture and filling the pressure-curing mold.
  • the invention takes into account that the flowability of the plasticized molding composition substantially depends on the proportion of the plastic polyethylene in the plasticized molding composition. Also, that depends on this proportion, the surface quality of the three-dimensional objects to be achieved.
  • the invention also takes into account that the proportion of polyethylene further depends on the strength characteristics of the molded three-dimensional objects. According to the invention, therefore, the pressure-intrusion process is controlled so that the plasticized molding material just contains the required amount of polyethylene, which leads to the full formation of the three-dimensional objects. If an improved surface structure is required, the proportion of polyethylene in the plasticized molding composition can be adjusted.
  • the invention takes into account that delivered recycled plastic waste can have a stochastically distributed proportion of polyethylene components. This may vary according to the product specifications of the recycling industry. between 0 and 90%, but will probably be about one third of the recycled plastic mass.
  • the content of polyethylene is first determined in the delivered recycled plastic waste.
  • the test result is decisive for the further treatment of the recycled plastic waste.
  • the proportion of polyethylene is then determined again, so that measures for their further treatment can be determined.
  • First and second mixture are each prepared separately to a recycled plastic mass by a size fractionation is carried out, foreign components (stones, metal objects, etc.) are sorted out and, if necessary, difficult to process plastics, such as polyvinyl chloride and polyethylene terephthalate are additionally discarded.
  • the latter ingredients may remain in the mixture to some extent. However, if this is too high, the pressure-intrusion process is disturbed and the proportion of these materials must be lowered by targeted removal from the mixture.
  • the treatment of the two mixtures after comminution or sorting refers in particular to the removal of gaseous constituents, such as water, remaining buildup of contents of recycled packaging and the like.
  • the two recycled plastic mixtures are subsequently mixed in a ratio which, in accordance with the criteria described above, is suitable for reliably forming the three-dimensional objects to be produced.
  • the proportion of polyethylene in the first recycled plastic mass is determined and then adjusted by metered addition of the second recycled plastic mixture of the required for further processing polyethylene content.
  • the recycled plastic mixture is fed to an extruder, which plasticizes the same and filled via a filler neck the Druckintrusionsform.
  • the filling of the pressure-in-mold takes place over a longer time interval. It comes by contact of the molding compound with the walls of the mold to partial cooling and an incipient cooling process from outside to inside.
  • the pressure of the inflowing molding compound is increased via the filler neck, in order to fully mold the surface structure of the three-dimensional object and at the same time minimize the volume of gas bubbles contained in the molding compound.
  • Completely filled Druckintrusionsformen be closed and separated from the filler neck. Subsequently, they are subjected to a cooling process, at the end of which the three-dimensional object is demolded.
  • the procedure described above can be adapted in various ways to circumstances, as far as this results from the particularities of the recycled plastic waste used, from plant-specific features o- special features of projectformenden with the three-dimensional objects. For example, it may be provided that the recycled plastic waste supplied to the process is already sorted according to specifications that place significantly higher demands on the product specifications explained in the prior art.
  • An advantageous embodiment of the method according to the invention arises when the selection criterion for the mixing ratio between the first and second recycled plastic mass is the recognized flowability of the plasticizer. About the final share of polyethylene fractions, especially of individual polyethylene grades, the flowability of the plasticized material is determined. It can also be provided to apply the number and / or size and / or distribution of vacuoles or the resulting surface quality of the molded three-dimensional objects as a selection criterion for the mixing ratio of first and second recycled plastic mass. A particularly advantageous embodiment of the method according to the invention arises when a particularly high proportion of low-pressure polyethylene (LDPE) is provided in the production of the second recycled plastic mass.
  • LDPE low-pressure polyethylene
  • LLDPE linear low-density polyethylene
  • the mixing of the first and the second recycled plastic mass may take place in a mixer, a conveyor, an agglomerator, a hot pelletizer or an extruder.
  • drying various facilities, such as drying tunnels, agglomerators, H exertpelletierer, presses or extruders may be provided. If the recycled plastics material already dehumidifies sufficiently after dehumidification (drying), it can be fed directly to the extruder.
  • a preferred form of dehumidification arises when, by way of increasing the temperature, it is ensured, in particular, that moisture contained passes into the vapor phase and moisture contained in the recycled molding composition can be removed in this way with little expenditure of energy. In particular, the energy required for dehumidification can thus be significantly reduced.
  • Particularly suitable for such a method step are a microwave-producing drying unit or a cascade of two extruders with a relaxation section arranged between the two extruders.
  • the mold After completion of the high-pressure filling phase, the mold is closed, separated from the second extruder and transported into the cooling zone.
  • the cooling process can take place after its beginning over a longer period, wherein the molding can remain in the mold until it reaches the ambient temperature. It is possible to accelerate the cooling process by using cooling media.
  • a preferred embodiment of the method is that the molding material is brought into the mold via a pressure-intrusion process.
  • care is taken that an increased pressure is built up in the feed channel, wherein the pressure level should expediently be at least 20 bar.
  • the pressure level should expediently be at least 20 bar.
  • a further preferred embodiment of the method is that at the end of filling the mold both in the mold and in the feed channel of the extruder, a pressure increase takes place, which is at least three times the filling pressure. The increased pressure is then maintained and the mold is separated from the extruder, thereby largely avoiding the formation of vacuoles in the three-dimensional article.
  • three-dimensional objects can be produced which have a cylindrical, a rectangular or a polygonal cross-section.
  • the manufactured three-dimensional objects can be used for a wide variety of applications. Thus, applications such as pegs, posts, railway sleepers, sheet piling, supports, for tubular parts or masts are possible. If the three-dimensional object is to be used as a pole, it can taper off at its end face and its tip can be formed of the same material.
  • a preferred embodiment of the method is to accelerate the cooling in the area of the inserts of the shape such that the solidification process of the three-dimensional object takes place from the inside and thus cools the three-dimensional object substantially without tension. It does not matter in which way the cooling is effected, which cooling medium is used and how the cooling process is otherwise configured. Ultimately, this is an optimization task determined by the three-dimensional object to be generated. In the production of hollow molds, it is possible that in the shell of the three-dimensional object recesses are additionally formed.
  • the three-dimensional objects produced by the method according to the invention described above are sufficiently strong, stable, insensitive to the effects of weathering, seawater-resistant and rot-proof for the above-mentioned uses. Furthermore, they are climate-neutral and ecologically harmless. In addition, at the end of their life cycle, they can be recycled back into the raw material cycle and thus serve again as a raw material base for three-dimensional objects to be produced according to the method described above.
  • the invention will be explained in more detail below with reference to some embodiments and drawings. Showing:
  • Fig. 1- is a schematic representation of an intrusion process, as in
  • FIG. 1 shows a schematic representation of the sequence of a further preferred embodiment of the method according to the invention according to FIG.
  • the processors can be according to step 1. deliver recycled plastic waste that can comply with product specifications 310, 321, 322, 350 or 352. It may also be separately collected packaging residues, residues of technical plastic parts or the like. A proportion of foreign substances is also regularly included.
  • the delivered recycled plastic waste is shredded after delivery according to step 2. and then sorted according to step 3., where both processing steps can be exchanged with each other in the order or even linked together.
  • a recycled plastic material is produced, which is either further processed directly or, if necessary, according to step 4. stored in silos, sacks or large containers.
  • the recycled plastic mass is further processed into a plasticized molding compound in accordance with process step 5 via an extruder, and this is filled with an intrusion mold connected to the extruder in accordance with step 6.
  • the filled intrusive mold can be removed from the extruder after filling and stored intermediately.
  • the intermediate storage is carried out according to step 7.
  • the cooling process of the molded parts wherein after reaching a certain component temperature the same, as indicated in step 8, can be removed from the mold.
  • the demolded part can then be stored temporarily or, if necessary, subjected to a machining operation.
  • the inventive method provides that after the with 1. This means that when the recycled plastic waste is handed over in an intermediate step 1 .1. the content of the delivered masses of the polyethylene fractions HDPE, LDPE and LLDPE is determined.
  • a special feature may be that - if possible - delivered batches that fully comply with product specification 321 are also sorted out without determining the content of PE fractions.
  • An embodiment of the method may consist in the fact that with the delivery of recycled plastic waste a separation of batches with high PE contents already in step 1. he follows. Likewise, PE industrial waste and the like can be accepted in this step. In the subsequent step 2, the recycled plastic waste shredded and sorted in a step 3., whereby both steps can be interchanged or linked together in the process of the invention.
  • First us second recyclate plastic mixture can be stored temporarily or further processed directly.
  • the production of the first and second recycled plastic mixtures is usually synchronous with the production of the three-dimensional objects.
  • the flow behavior of the plasticized molding compound is observed during filling of the molds and decisions are derived from the results obtained, in which way the flow behavior by increasing or decreasing the proportion of the second recycled plastic mixture is required.
  • information about this can be obtained by evaluating already formed three-dimensional objects and also influencing the proportion of the second recycled plastic mixture to be admixed.
  • a preferred embodiment of the method provides that, after the work steps 2, 3 or 4, the proportion of PE fractions in the total mixture is already determined on the first recycled plastic mixture. From the results of the tests and in connection with any proportions of other plastics that may have been detected, the necessary proportion of PE fractions can be deduced and an adaptation can be achieved by varying the addition amounts of the second recycled plastic mixture.
  • a preferred embodiment of the method according to the invention additionally provides, after the 4th working step, for dehumidifying the recyclate plastic mass which is to be processed. This can be done by means of agglomerators, hot pelletizers or by an extruder cascade.
  • the recycled plastic mass is heated above the plasticizing temperature, whereby a large part of the moisture contained in the vapor phase passes and escapes from the molding compound.
  • an extruder cascade is used in this case, it is designed in such a way that the extruder charged with the recycled plastic mass initially plasticizes it and conveys the plasticized molding mass flow back into the open.
  • plasticizing takes place on moistened plastic mass particles, a temperature increase, which also leads during the plasticization to an isochor-adiabatic pressure increase and the inclusion in the form of vapor bubbles in the molding composition.
  • the molding compound After the molding compound has been discharged to the outside, a large part of the moisture can escape through the then possible expansion of the trapped water vapor.
  • the period of relaxation can be optimized by choosing the time duration, by increasing the surface of the molding compound and by the transport speed of the molding material.
  • Dehumidifying operation 5 may also be carried out by means which are particularly suitable for vaporizing water contained in the molding compound. Typically, this can be done using microwaves.
  • the plasticized molding compound shoots into the mold as a homogeneous mass flow. Subsequently, the mass flow first relaxes and the molding material swells up. Upon contact with the wall, solid particles solidify, accumulate near the wall, but are still heated by the incoming mass flow. This results in the mold during filling a comparatively rapid formation of a solidified outer skin, while still flowing in the interior of molding compound with a higher temperature. After the mold volume is largely filled, further molding compound is pressed through the extruder, wherein an increase in pressure takes place at least to five times the filling pressure. This measure ensures that the mold fills completely and no defects can form. Furthermore, it is achieved that inside the moldings during the subsequent cooling phase no voids can arise. At best, a formation of small bubbles may occur in the core area.
  • Another embodiment of the method according to the invention relates to the cooling phase.
  • the mold to be filled is additionally equipped with a deposit to produce moldings with a cavity.
  • the outer shape is broken, so that the interior of the insert access is possible.
  • this solidification process Once this solidification process has started, it will also run until the ambient temperature is reached. Depending on the rate of cooling, the molding can be cooled more or less quickly and more or less stress-free. Ultimately, this is an optimization task.
  • the three-dimensional objects produced by the method according to the invention can be embodied with a cylindrical, a rectangular or a polygonal cross-section.
  • hollow shapes such as tubular, box-shaped or the like can be executed.
  • elongate moldings are to be produced by the method according to the invention.
  • Preferred embodiments are therefore cylindrical moldings, pegs or piles, boards or planks, beams, sleepers and molds, such as columns with conical holes, rectangular blocks with conical holes and antenna or lampposts, which are also conical on their outer contour.
  • a particularly preferred use are lamp posts with a lateral recess for the installation of the electrical system.
  • the pressurized molding compound shoots with overpressure in the mold and distributed after the release in the mold cavity immediately immediately. Furthermore, a continuous flow then forms inside the mold space, while in areas near the mold wall a cooling and hardening process already takes place.
  • the already in cooling particles of the molding material at the same time form a heat insulating jacket through which the molding compound flowing in the interior is largely maintained at temperature and forms a flow channel within the mold, which allows the filling of very long shapes without the molding mass flow solidifies.
  • a preferred embodiment of the invention consists in the production of hollow profiles.
  • a sufficiently conically shaped core is inserted in the interior of the mold so that a channel which is sufficient for the molding material flow remains on each side.
  • a solidifying layer is also formed on the inserted mold core, which at the same time isolates the molding compound from the environment.
  • hollow profiles such as conical tubes, light poles, shaft inlets and the like can be produced. It is also possible to achieve lateral recesses in the molded part by inserting inserts into the mold which bridge the distance between the outer jacket and the inserted core.
  • Another preferred form of the method provides that the core to be inserted is hollow inside and offers the possibility of introducing cooling media. In this case, for example, with compressed air increased heat removal during cooling of the molding achieved and thus the curing of the molding from the inside out are possible.
  • the moldings produced in this way can be used as conical tubes, after boring as conventional tubes, as light poles or the like.
  • the shape is that of a lamppost, insertions in the form can at the same time be used to form the shape for the installation opening.
  • the inventive method thus has the advantage that on the one hand at least sufficient flow properties of the plasticized molding composition by mixing a first and a second molding compound and on the other hand, a reduction in the moisture content or the content of other gassing substances causes and thus conditions are created, intrusive moldings to significantly reduce the risk of malformations and inappropriate levels of vacuoles.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un procédé pour produire des objets tridimensionnels à partir de matières plastiques au moyen d'un procédé d'intrusion. L'invention concerne en particulier des modes de réalisation de ce procédé d'intrusion, selon lesquels on utilise une première et une deuxième matière à mouler, la deuxième matière à mouler présentant une teneur élevée en fractions de polyéthylène (HDPE, LDPE, LLDPE) et étant ajoutée dans des proportions variables à la première matière à mouler recyclée. L'invention concerne en outre une étape de procédé supplémentaire au cours de laquelle une déshumidification (séchage) des matières à mouler recyclées est réalisée.
PCT/DE2011/075183 2010-08-03 2011-08-02 Procédé pour produire des objets tridimensionnels par intrusion sous pression à partir de déchets plastiques recyclés Ceased WO2012037932A2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE102010036808 2010-08-03
DE102010036808.3 2010-08-03
DE102010060817 2010-11-26
DE102010060817.3 2010-11-26
DE201110052015 DE102011052015A1 (de) 2010-11-26 2011-07-21 Verfahren zur Herstellung dreidimensionaler Gegenstände aus Recyclat-Kunststoffmassen, Verwendung der dreidimensionalen Gegenstände und nach dem Verfahren hergestellte dreidimensionale Gegenstände
DE102011052015.5 2011-07-21

Publications (2)

Publication Number Publication Date
WO2012037932A2 true WO2012037932A2 (fr) 2012-03-29
WO2012037932A3 WO2012037932A3 (fr) 2012-06-07

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WO2024184243A1 (fr) * 2023-03-03 2024-09-12 Borealis Ag Procédé de préparation d'une fraction de déchets plastiques triés et installation de recyclage

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