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WO1996034729A1 - Procede et dispositif de nettoyage de rognures de plastique salies par des matieres etrangeres - Google Patents

Procede et dispositif de nettoyage de rognures de plastique salies par des matieres etrangeres Download PDF

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Publication number
WO1996034729A1
WO1996034729A1 PCT/DE1995/000572 DE9500572W WO9634729A1 WO 1996034729 A1 WO1996034729 A1 WO 1996034729A1 DE 9500572 W DE9500572 W DE 9500572W WO 9634729 A1 WO9634729 A1 WO 9634729A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
bath
cyclone
plastic
washing
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/DE1995/000572
Other languages
German (de)
English (en)
Inventor
Bernd Pickert
Edgar Wünsch
Rainer Haliczinovski
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.)
R and T UMWELT GmbH
Original Assignee
R and T UMWELT 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 to DE19934337206 priority Critical patent/DE4337206C1/de
Application filed by R and T UMWELT GmbH filed Critical R and T UMWELT GmbH
Priority to AU28790/95A priority patent/AU2879095A/en
Priority to PCT/DE1995/000572 priority patent/WO1996034729A1/fr
Publication of WO1996034729A1 publication Critical patent/WO1996034729A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/102—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration with means for agitating the liquid
    • B08B3/104—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration with means for agitating the liquid using propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
    • 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
    • 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
    • B29B2017/0286—Cleaning means used for separation
    • B29B2017/0289—Washing the materials in liquids
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/065—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts containing impurities
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • 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 method for cleaning foreign-matter-containing plastic chips, in which the plastic chips are introduced into a wetting and pre-cleaning device which has a liquid supply on the side and a liquid bath below, in which the plastic chips are pre-cleaned.
  • the pre-cleaned plastic chips are introduced into a washing cascade in which the plastic chips are stirred by means of a stirring device, a plastic chip / liquid suspension containing cleaned plastic chips being removed from the liquid bath.
  • the invention further relates to a device for carrying out the method with a wetting and pre-cleaning device, in which the plastic chips are pre-cleaned.
  • the device also has a washing cascade which is provided with a feed for the pre-cleaned plastic chips and the steps of which each have a stirring device and a discharge line through which the cleaned plastic chips can be discharged from the liquid bath in a liquid / plastic chip suspension are.
  • plastic chips from the polyolefin group because of their low density when entering into liquids, e.g. Water, for an instant floating of the plastic chips on the surface of the liquid. Due to the resulting inadequate wetting of the plastic chips, only a small separation effect is achieved with regard to the separation of plastic chips with a slightly higher density than the carrier medium and dirt, paper and other particles adhering to the plastic chips.
  • Separation and washing devices for cleaning plastic chips either work with a relatively long dwell time of the plastic chips within the separating and washing device and low friction, e.g. Retention basin with overflow, or with a comparatively short residence time and a comparatively strong friction, e.g. Friction screws with screening devices.
  • the liquid baths which are also already used as separation and washing devices and are provided with stirring devices, have disadvantages in that the residence time spectrum of the plastic chips within the liquid baths is very unfavorable. This results from the fact that a certain proportion of the plastic chips containing foreign matter reaches the discharge of the liquid bath provided with the stirring device after a comparatively very short time and thus still strongly adheres to impurities and foreign matter such as e.g. Paper.
  • the invention is therefore based on the object of further developing the known washing and separating devices and the methods associated therewith, in particular for the cleaning of plastic chips, such that reliable and complete wetting of the plastic chips takes place and more uniform and qualitatively better cleaning of plastic chips containing foreign substances is realized.
  • This object is achieved by a method for cleaning foreign-matter-containing plastic chips, in which the foreign-matter-containing plastic chips are introduced into a wetting and pre-cleaning device and then into a multi-stage liquid bath, so that the plastic chips in the multi-stage liquid bath by means of at least one stirring device stirred and a cleaned plastic chip / liquid suspension containing plastic chips is removed from the liquid bath, characterized in that the plastic chips are introduced in the main axial direction of a wetting and pre-cleaning device designed as a cyclone, within the cyclone with a liquid stream radiated into the cyclone in this direction and are transported with the liquid stream below the liquid level of a liquid bath that the plastic shearers pre-cleaned in this way introduced into a first partial bath of a further liquid bath and are circulated with this in a circulation circuit and that the plastic chips are conveyed by means of a branch line from the circulation circuit of the first partial bath into a second partial bath, with which they are circulated in a further circulation circuit from which the plastic chips
  • a separation and washing device for carrying out the method according to one of claims 1 to 12, with a wetting and pre-cleaning device, with a multi-stage liquid bath that is provided with a feed for pre-cleaned plastic chips and its stages each have a stirring device and a discharge line can be discharged through the cleaned plastic chips in a liquid / plastic chip suspension from the liquid bath, characterized in that the wetting and pre-cleaning device is designed as a cyclone which can be loaded with the plastic chips on its inlet surface and which in its inlet section is connected to a liquid line, by means of which a liquid flow can be introduced tangentially into the inlet section of the cyclone, a liquid bath being arranged below the cyclone, in which Substances with a density> 1 g / cm s and / or dirt, paper and other particles adhering to the plastic chips are separated from the plastic chips so that the subsequent multi-stage liquid bath is separated into at least two separate partial baths that Each sub-bath is assigned
  • a liquid stream enters at high speed tangentially into the inlet section of the wetting and pre-cleaning device designed as a cyclone.
  • the plastic chips are inserted through the upper entry surface of the cyclone.
  • the plastic chips are already mixed very intensively with fluid in the feed device, ie in the cyclone.
  • the plastic chip / liquid flow emerges from the cyclone below the liquid level of the liquid bath present under the cyclone. Due to the very intensive wetting of the plastic chips already taking place in the insertion device, a comparatively effective separation of dirt, paper and other particles adhering to the plastic chips is achieved.
  • particularly favorable flow conditions within the cyclone can be achieved if the inlet section of the cyclone is cylindrical and if the cyclone tapers conically in a funnel section from or below its cylindrical inlet section.
  • the cyclone is connected on the output side to a discharge pipe, the end of which is remote from the cyclone is arranged below the liquid level of the liquid bath.
  • the discharge pipe is designed as a pipe bend, the outlet surface of which is inclined to the liquid level of the liquid bath such that the liquid / plastic chip flow emitted from the outlet surface is inclined is composed of a comparatively large flow component parallel to the liquid level of the liquid bath and a comparatively small flow component directed vertically downward with respect to the liquid level of the liquid bath.
  • the flow component of the plastic chip flow parallel to the liquid level of the liquid bath ensures that the plastic chips of low density cannot float up immediately.
  • the pipe elbow can be directed with its exit surface in the direction of the light material discharge of the liquid bath.
  • An additional extension of the dwell time of the plastic chips within the liquid bath below the liquid level can be achieved if a plate is arranged in the liquid bath above the outlet surface of the discharge tube and below the liquid level of the liquid bath at a small angle to the liquid level of the liquid bath by means of which the buoyancy of the plastic chips in the liquid bath can be hindered.
  • a considerable stabilization of the functioning of the wetting and pre-cleaning device is achieved if an injector working with water injection is installed in the pipe elbow in the direction of a light material discharge.
  • the invention provides a method for wetting and pre-cleaning plastic chips, in which the plastic chips are introduced into the cyclone in the main axial direction of the cyclone, acted upon within the cyclone with a liquid stream emitted into the cyclone in the tangential direction thereof, and with the liquid current below the liquid level of the liquid bath located under the cyclone.
  • Any elaborate measures to push plastic chips that have reached the liquid level back into the liquid bath below the liquid level can be dispensed with since the method described above can ensure a sufficiently long dwell time of the plastic chips within the liquid bath, or because one already occurs during the entry process intensive mixing and wetting of the plastic chips takes place with the liquid stream acting upon them, directed tangentially into the cyclone and forming a liquid vortex.
  • the dwell time of the plastic chips in the liquid bath below the liquid level can be increased considerably if the liquid / plastic chip flow at the exit from the cyclone or a discharge pipe connected to the cyclone forms an acute angle with a plane parallel to the liquid level of the liquid bath is directed downwards.
  • a further increase in the dwell time of the plastic chips inside the liquid bath below the liquid level can be achieved if the buoyancy of the plastic chips inside the liquid bath is between the liquid level and the outlet from the cyclone or at a point at an acute angle to the liquid level of the liquid bath Cyclone connected discharge pipe arranged plate is hindered.
  • the pre-cleaned material is now fed to a cascade of partial baths provided with stirring devices, from which the pre-cleaned plastic chips are fed into the input-side partial bath, while a liquid / plastic chip suspension is removed from the partial bath on the output side, which contains uniformly and well-cleaned plastic chips.
  • a significantly improved residence time spectrum of the plastic chips within the separating and washing device is thus achieved, which can be attributed to the use of at least two partial baths provided with stirring devices.
  • the tendency of the pre-cleaned plastic chips to "shoot through" through the separating and washing device is significantly reduced.
  • washing devices can be chosen comparatively high. This is important insofar as a longer dissolving time is inevitable for the detachment of stickers and other poorly soluble substances from the plastic chips, since this is a diffusion-controlled process.
  • the friction required for detaching and defibrating paper adhered to the plastic chips can be achieved with a comparatively high flow rate by the stirring action of the stirring devices and the circulation of the liquid / plastic chip suspension by the circulation circuit .
  • the washing and dissolving process is further assisted by the fact that a comparatively high particle concentration, which is between 15 and 20%, is maintained in the stirred and circulated plastic chip / liquid suspension in the first and in the second partial bath.
  • a comparatively high particle concentration which is between 15 and 20%
  • a further improvement in the residence time spectrum of the plastic chips within the liquid cascade can be achieved in the method according to the invention if the plastic chip / liquid suspension is passed through at least one further partial bath from its discharge from the separating and washing device.
  • the more subbands of the liquid / plastic chip suspension between the entry into the separating and washing device and the discharge from the separating and washing device the more uniform the residence time spectrum of the plastic chips within the separating and washing device.
  • the at least two partial baths of the liquid bath can be constructed in a container in a structurally simple manner, wherein they are separated from one another by partition walls.
  • the stirring device of the first or second sub-bath can be operated at a speed between 200 and 500 rpm, the foreign matter adhering to the plastic chips, e.g. of paper, required friction effect can be provided. According to the invention, lower or higher speeds can also be used.
  • the washing liquid according to the invention in the wetting and pre-cleaning part and in the subsequent washing cascade is preferably water, but also other washing liquids which cannot dissolve the feed materials, in particular plastic chips, can be used, e.g. Mixtures of water-soluble organic liquids with water, such as alcohols, ketones, dioxanes, furans, pyrrolidones etc. or even organic liquids themselves.
  • the washing liquid which is used in the wetting and pre-cleaning part, is subsequently separated from the pre-cleaned materials, e.g. via filters and other separators or separators, e.g. Centrifuges.
  • the materials are then fed into the washing cascade.
  • the moist material is fed directly from the wetting and pre-cleaning part to the washing cascade.
  • at least part of the washing liquid from the wetting and pre-cleaning stage can also be fed to the washing cascade.
  • the separation device can be loaded with pre-cleaned materials from the liquid bath located under the cyclone, particularly in the case of polyolefin chips, in such a way that they pass from the liquid bath into the separation device as an overflow with washing liquid.
  • discharge devices are known to the person skilled in the art and should not be explained in more detail.
  • suitable discharge devices which are also known to the person skilled in the art.
  • a regranulation system from which warm, flowing cooling water can be used for pre-cleaning, wetting and washing can be mentioned and explained as an example.
  • FIG 3 an extrusion and granulating device is shown schematically. Washed, dried and sorted plastic chips are subjected to a melting and granulating process in the extrusion and granulating device 37.
  • the extrusion and granulation device 37 is provided with a cooling water circuit 38 in order to dissipate the thermal energy generated in this melting and granulating process in the melt or plastic stream.
  • a pump 39 is arranged in the cooling water circuit 38, by means of which cooling water contained in the cooling water circuit 38 can be circulated.
  • the cooling water emerging from the pump 39 passes through the above-mentioned extrusion and pelletizing device 37, an air flow cooler 40, a storage container 41 and a heat exchanger 42, from which the cooling water flows is sucked in by the pump 39.
  • the cooling water leaving the pump 39 absorbs the excess thermal energy generated in the melt or plastic stream as it passes through the extrusion and granulating device 37.
  • the warmed-up cooling water passes through a cooling coil 43, which is swept by an intake air flow 44 which flows through a blower suction shaft of a heating device 45.
  • the cooling water leaving the extrusion and granulating device 37 at a temperature of approximately 40 ° C. is accordingly subjected to pre-cooling in the airflow cooler 40. This is of considerable economic advantage since the amount of cooling water in the subsequent water cooler can be considerably reduced.
  • the heat energy extracted from the cooling water can be used to preheat the intake air flow 44 generated by the fan of the heating device 45 for space heating.
  • the pre-cooled cooling water reaches the storage container 41, which serves to even out the cooling water flow within the cooling water circuit 38. Downstream of the storage container 41, the cooling water pre-cooled in the airflow cooler 40 enters the heat exchanger 42, within which it passes through a further cooling coil 46.
  • the heat exchanger 46 has a fresh water inlet 47 shown schematically in the figure and a fresh water outlet 48 also shown schematically in the figure.
  • the fresh water entering the heat exchanger 42 through the fresh water inlet 47 takes further thermal energy from the cooling water flowing through the cooling coil 46 of the heat exchanger 42 and leaves it the heat exchanger 42 through the fresh water outlet 48, which is connected by a fresh water line, not shown, to a wetting, pre-cleaning and washing system of the plastic recycling system, also not shown in the figure. Within this cleaning or washing stage, the cleaning of plastic chips is strengthened and supported due to the preheating of the fresh water.
  • the cooling water circuit 38 Downstream of the heat exchanger 42 and upstream of the pump 39, the cooling water circuit 38 is provided with a temperature measuring device 49, by means of which the temperature of the cooling water upstream of the pump can be determined.
  • the temperature measuring device 49 is connected to a drive unit 51 of the pump by means of a control line 50. If it is determined by the temperature measuring device 49 that the temperature of the cooling water of the cooling water circuit 38 is outside a range which is advantageous for the operation of the extrusion and granulating device 37, the drive unit 51 of the pump 39 is given a setting pulse via the control line 50, by means of which the speed of the drive unit 51 of the pump is adjusted so that the temperature of the cooling water of the cooling water circuit 38 is moved again into the desired range.
  • FIG. 1 a wetting and pre-cleaning system according to the invention is shown.
  • the cyclone 2 has an open upper entry surface 3, through which it can be acted upon in its main axis direction 4 with a plastic chip stream represented by an arrow 5.
  • the cyclone 2 has a cylindrical inlet section 6, which is arranged in the single figure below the entry surface 3 and is connected to a liquid line 7 on the right-hand side in the figure, by means of which a liquid flow, preferably a water flow, flows at a high flow rate the input section 6 can be radiated into the cyclone 2.
  • a conically tapering funnel section 8 adjoins the input section 6 of the cyclone 2.
  • the lower end of the funnel section 8 of the cyclone 2 is below the liquid level 9 of the liquid bath 1 and connected there to a discharge pipe 10 which has a straight pipe section 11 connected to the lower end of the funnel section 8 and a pipe elbow 12 connected to the lower end of the straight pipe section 11.
  • the liquid / plastic chip flow 14 emitted by it from the elbow 12 has a comparatively large flow component 15 parallel to the liquid level 9 of the liquid bath 1 and a comparatively small vertically downward with respect to the liquid level 9 of the liquid bath 1 Has flow component.
  • the comparatively large flow component 15 of the liquid / plastic chip flow parallel to the liquid level 9 of the liquid bath 1 is directed towards the light material discharge of the liquid bath 1, not shown in the figure.
  • a plate 17 is arranged in the liquid bath 1, which includes a comparatively acute angle with a plane parallel to the liquid level 9 of the liquid bath 1.
  • the cyclone 2 is fixed by means of bearings 18 above the liquid bath 1.
  • the plastic chip stream 5 is introduced through the entry surface 3 of the cyclone 2 parallel to its main axis direction 4 in its input section 6. There, the plastic chips are acted upon by the water stream entering from the liquid line 7 in the tangential direction into the input section 6 of the cyclone 2.
  • a water vortex is formed in which there is intensive mixing of the water and the plastic chips, in the course of which the plastic chips are almost completely wetted.
  • the mixture of water and plastic chips enters through the straight pipe section 1 of the discharge pipe 10 into the pipe bend 12 of the discharge pipe 10, which pipe bend 12 the mixture mentioned through the outlet surface 13 of the pipe bend 12 as a liquid / plastic chip flow 14 leaves.
  • the relatively large flow component 15 of this liquid / plastic chip flow which is parallel to the liquid level 9 of the liquid bath 1, is directed towards the light material discharge of the liquid bath 1. Because of the liquid level 9 of the liquid bath 1 vertically downward flow component 16 of the liquid / plastic chip flow results in a not inconsiderably longer dwell time for the plastic chip in the liquid bath 1 below the liquid level 9 the plate 17, which is arranged above the outlet surface 13 of the pipe bend 12 and below the liquid level 9 of the liquid bath 1, is prevented.
  • an injector 19 shown in dashed lines in the figure can be installed in the direction of the light material discharge, which works with water injection. This considerably stabilizes the functioning of the entry device.
  • FIG. 2 shows a washing cascade 1 according to the invention for cleaning plastic wafers.
  • a washing cascade 1 for cleaning plastic wafers.
  • Such a device can be used as a washing stage of a plastics recycling or plastics recycling plant.
  • washing cascade is used as part of a hollow body line, this washing cascade is followed e.g. a sieve drum, which is continuously fed with a defined amount of plastic chip / liquid suspension. If the wash cascade mentioned at the beginning is part of a film line, the wash cascade is followed, for example, by a vibrating sieve. Coarse dewatering is carried out both in the screening drum for the hollow body line and in the vibrating screen for the film line.
  • the washing cascade for cleaning plastic chips has a liquid bath 21/22 separated into a first partial bath 21 on the input side and a second partial bath 22 on the output side.
  • Both partial baths 21/22 are filled with a liquid, e.g. filled with water.
  • both partial baths 21/22 are each equipped with a stirring device 23 or 24 and with a circulation circuit 27 or 28 each operated by a pump 25 or 26.
  • the two partial baths 21/22 each have a liquid supply line 29 or 30.
  • the first partial bath 21 has an entry device, not shown, by means of which a stream of pre-cleaned plastic chips 31 can be introduced into the first partial bath 21. Between Between the circulation circuit 27 of the first partial bath 21 and the second partial bath 22, a branch line is arranged, by means of which plastic chips / water suspension can be conveyed from the first partial bath 21 or its circulation circuit 27 into the second partial bath 22.
  • the circulation circuit 28 of the second partial bath 22 is connected via a branch line 33 to a discharge line 34 which leads to the above-mentioned vibrating drum or to the above-mentioned vibrating screen.
  • the first partial bath 21 on the input side and the second partial bath 22 on the output side of the washing cascade are filled with water.
  • the stirring device 23 of the first partial bath and the stirring device 24 of the second partial bath are switched on and rotate in the direction of rotation indicated by arrows 35 and 36, respectively.
  • the pre-cleaned plastic chips 31 continuously come out of the mill into the first partial bath 21 of the washing cascade.
  • the pump 25 pumps through the circulation circuit 27 of the first sub-bath 21 at a comparatively high flow rate, which can be between 3 and 5 m / s, but can also include other speeds, the plastic chip / water suspension formed in the first sub-bath 21 through the first recirculation circuit .
  • the opening direction of the first circulation circuit 27 into the first partial bath 21 is selected such that the suspension mentioned is emitted into the first partial bath in a direction which is exactly opposite to the direction of rotation of the stirring device 23 of the first partial bath represented by arrow 35.
  • the stirring device 23 of the first partial bath 21 is preferably operated at a speed between 200 and 500 rpm.
  • the first partial bath 21 is loaded with pre-cleaned plastic chips to such an extent that the particle concentration in the plastic chip / water suspension is between 15 and 20%. Due to the stirring action of the first stirring device, the movement of the plastic chips during the circulating movement through the circulating circuit 27 of the first sub-bath 21, and due to the opposite entry to the direction of rotation of the stirring device 23 of the first sub-bath 21, between the individual plastic chips occurs from the circulating circuit 27 of the first sub-bath 21 this radiated flow has the friction effects required for cleaning the plastic chips.
  • an adjustable portion of the plastic chip / water suspension flowing through the circulating circuit 27 of the first partial bath 21 passes through the branch line 32 into the second partial bath 22, in which the stirring device direction 24 of the second sub-bath 22 works.
  • the plastic chip / water suspension present in the second partial bath 22 is moved through the second circulation circuit 28 by pump 26.
  • the exit of the plastic chips / water suspension from the circulation circuit 28 of the second partial bath 22 into this takes place - as in the case of the first partial bath 21 - exactly against the rotating device of the stirring device 24 of the second partial bath 22 represented by the arrow 36.
  • the friction effect acting on the plastic chips results in accordance with the explanations in connection with the first partial bath 21.
  • an adjustable portion of the plastic chip water suspension flowing through the circulating circuit 28 is removed through a branch line 33, from which the plastic chip / water suspension gets into the discharge line 34 of the separating and washing device.
  • the discharge line 34 in turn is connected to the screening drum already mentioned at the beginning or to the vibrating screen already mentioned at the beginning.

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

Selon le procédé décrit de nettoyage de rognures de plastique salies par des matières étrangères, on introduit les rognures de plastique dans un dispositif de mouillage et de prénettoyage, comportant un dispositif d'amenée de liquide, situé sur un côté, et, au fond, un bain de liquide dans lequel les rognures sont prénettoyées. On fait ensuite passer les rognures prénettoyées dans une cascade de lavage dans laquelle elles sont agitées par un agitateur et on retire du bain de liquide une suspension constituée d'un liquide et de rognures de plastique nettoyées. L'invention concerne également un dispositif permettant la mise en oeuvre de ce procédé, qui comprend un dispositif de mouillage et de prénettoyage dans lequel les rognures de plastique sont prénettoyées. Le dispositif comprend en outre une cascade de lavage pourvue d'un système d'amenée de rognures de plastique prénettoyées et dont les étages sont équipés chacun d'un agitateur et d'un conduit de décharge par lequel les rognures de plastique nettoyées peuvent être déchargées du bain de liquide sous forme d'une suspension constituée d'un liquide et de rognures plastiques.
PCT/DE1995/000572 1993-10-30 1995-05-03 Procede et dispositif de nettoyage de rognures de plastique salies par des matieres etrangeres Ceased WO1996034729A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19934337206 DE4337206C1 (de) 1993-10-30 1993-10-30 Verfahren zur Reinigung von fremdstoffbehafteten Kunststoffschnitzeln und Trenn- und Wascheinrichtung zur Durchführung des Verfahrens
AU28790/95A AU2879095A (en) 1995-05-03 1995-05-03 Process and device for cleaning plastic shreds soiled with f oreign substances
PCT/DE1995/000572 WO1996034729A1 (fr) 1993-10-30 1995-05-03 Procede et dispositif de nettoyage de rognures de plastique salies par des matieres etrangeres

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934337206 DE4337206C1 (de) 1993-10-30 1993-10-30 Verfahren zur Reinigung von fremdstoffbehafteten Kunststoffschnitzeln und Trenn- und Wascheinrichtung zur Durchführung des Verfahrens
PCT/DE1995/000572 WO1996034729A1 (fr) 1993-10-30 1995-05-03 Procede et dispositif de nettoyage de rognures de plastique salies par des matieres etrangeres

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WO1996034729A1 true WO1996034729A1 (fr) 1996-11-07

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DE (1) DE4337206C1 (fr)
WO (1) WO1996034729A1 (fr)

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EP1188540A3 (fr) * 2000-09-19 2002-06-05 Fuji Photo Film Co., Ltd. Méthode de recyclage pour produits en polymères et procédé avec un dispositif pour laver une matière plastique fractionnée
CN101468350A (zh) * 2007-10-22 2009-07-01 克朗斯股份有限公司 块状物质清洁设备及方法
US9352363B2 (en) 2011-12-12 2016-05-31 Krones Ag Device and process for cleaning plastic chips
WO2023166433A1 (fr) * 2022-03-01 2023-09-07 Fadebe S.P.A. Procédé de récupération et de regénération de plastiques polyoléfiniques et installations de recyclage relatives

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FR2736000B1 (fr) * 1995-06-30 1997-08-22 C2P Procede de traitement d'un substrat
IT201600129016A1 (it) 2016-12-20 2018-06-20 Previero Sas Metodo e apparato di lavaggio e separazione per materie plastiche

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1188540A3 (fr) * 2000-09-19 2002-06-05 Fuji Photo Film Co., Ltd. Méthode de recyclage pour produits en polymères et procédé avec un dispositif pour laver une matière plastique fractionnée
US6846441B2 (en) 2000-09-19 2005-01-25 Fuji Photo Film Co., Ltd. Method for recycling used-up plastic products and washing process of crushed plastic and apparatus therefor
US7231927B2 (en) 2000-09-19 2007-06-19 Fujifilm Corporation Method for recycling used-up plastic products and washing process of crushed plastic and apparatus therefor
CN101468350A (zh) * 2007-10-22 2009-07-01 克朗斯股份有限公司 块状物质清洁设备及方法
US8505561B2 (en) 2007-10-22 2013-08-13 Krones Ag Apparatus for cleaning bulk material
US9352363B2 (en) 2011-12-12 2016-05-31 Krones Ag Device and process for cleaning plastic chips
WO2023166433A1 (fr) * 2022-03-01 2023-09-07 Fadebe S.P.A. Procédé de récupération et de regénération de plastiques polyoléfiniques et installations de recyclage relatives

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