WO2002000321A1 - Dispositif d'epuration de materiau thermoplastique - Google Patents

Dispositif d'epuration de materiau thermoplastique Download PDF

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Publication number
WO2002000321A1
WO2002000321A1 PCT/EP2001/007463 EP0107463W WO0200321A1 WO 2002000321 A1 WO2002000321 A1 WO 2002000321A1 EP 0107463 W EP0107463 W EP 0107463W WO 0200321 A1 WO0200321 A1 WO 0200321A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter belt
filter
filter band
outlet
housing
Prior art date
Application number
PCT/EP2001/007463
Other languages
German (de)
English (en)
Inventor
Josef Gail
Original Assignee
Josef Gail
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 DE10103990A external-priority patent/DE10103990A1/de
Application filed by Josef Gail filed Critical Josef Gail
Priority to EP01967109A priority Critical patent/EP1294463A1/fr
Publication of WO2002000321A1 publication Critical patent/WO2002000321A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/09—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with filtering bands, e.g. movable between filtering operations
    • B01D29/096—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/684—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a translatory movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
    • B01D29/84—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating
    • B01D29/843—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating by direct contact with a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/056—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D33/503—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles the backwash arms, shoes acting on the cake side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B01D33/66—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating
    • B01D33/663—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating by direct contact with a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/801—Driving means, shaft packing systems or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/18—Heating or cooling the filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/69—Filters or screens for the moulding material
    • B29C48/692—Filters or screens for the moulding material in the form of webs displaceable for using adjacent areas consecutively
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Definitions

  • thermoplastic material For cleaning thermoplastic material, it is known, for example, from WO98 / 31 527, but also from CH 469 547, DE 199 16 539, DE 1 944 704 and FR 2 332 1 13, which plastic material softened to a viscous melt state due to a close-knit,
  • plastic material softened to a viscous melt state due to a close-knit For example, to press filter belt consisting of wire mesh, which is supported on a support body provided with a large number of comparatively large passage openings, in order to be able to absorb the high compression pressure in practice.
  • the filter belt is loaded with the contaminants of the plastic melt in the area of the support body and shifted step by step or continuously, whereby the contamination load is removed and unloaded areas of the filter belt are moved over the support body.
  • the filter band displaceably penetrates in its longitudinal direction the flow path of the thermoplastic material running in a housing of the device between a feed channel and a discharge channel.
  • the housing must be sealed off from the filter band in the area of its filter band inlet and in the area of its filter band outlet in order to prevent the plastic melt from spilling out of the housing along the filter band due to the high internal pressure.
  • cooling devices are provided at the filter belt inlet and at the filter belt outlet, which cool the plastic melt in these areas down to the solidification state.
  • the resulting plastic plugs seal the filter band inlet and the filter band outlet sufficiently tightly.
  • the filter belt is exposed to very high frictional forces, making it difficult or impossible to move it. This applies in particular if the plastic melt forms solidified plastic drops in the area of the filter band inlet and the filter band outlet for sealing.
  • the general aim of the invention is to increase the cleaning performance of a device for cleaning thermoplastic material from solid contaminants with comparatively simple technical means.
  • the object of the invention is to achieve this goal by a reliable and quickly effective sealing of the filter belt.
  • the invention generally relates to a device for cleaning thermoplastic material, in particular plastic material, from solid contaminants, comprising: a housing with a feed channel for the material to be cleaned and a discharge channel for the cleaned material, a flow path of the material in the housing between the supply channel and the discharge channel sealed penetrating, displaceable in its longitudinal direction filter band for separating the
  • Solid contaminants ( a support body arranged on the side of the filter band facing the discharge duct in the flow path with a plurality of side-by-side passage ducts for the passage of the cleaned material to the discharge duct; the housing in the region of its filter band inlet and in the region of its filter band outlet sealing means and seals for the filter band the gradual or continuous feed of the filter belt.
  • the above-mentioned object is achieved according to the invention in that the sealing means of the filter belt outlet cool the contaminant load of the filter belt containing a portion of thermoplastic material at least approximately to the state of solidification, and that the cross-sectional size of the filter belt outlet and the cross-sectional size of the with the solidified contaminant load loaded filter belt for blocking or releasing the feed movement of the filter belt relative to each other, controllable blocking device is provided.
  • the invention is based on the consideration not to soften the solidified plastic drop formed for the sealing of the filter band outlet for the advancing movement of the filter band thermally as before, but to leave the plastic material in this area in the solidified state and instead to remove the mechanical blocking of the solidified plastic material ,
  • a blocking device of this type can be blocked or released very quickly, so that the filter belt feed can also be carried out in short successive intervals without impairing the sealing effect, which increases the cleaning performance of the device according to the invention.
  • the blocking device can comprise a stamp which can be moved by a controllable actuator, for example a hydraulic pressure cylinder, transversely to the direction of advance of the filter belt towards the contamination load of the filter belt or away therefrom.
  • a controllable actuator for example a hydraulic pressure cylinder
  • the stamp acts against the solidified area of the contamination load and, unlike in the case of conventional sealing strips, does not have a sealing function, which has led to problems in conventional sealing strips of the type explained above.
  • the latter can have clamping projections or the like on its side facing the contamination load, which protrusions may be located in the plastic material dig.
  • the feed movement of the stamp can optionally be overlaid by a movement directed transversely to the filter belt, which allows the stamp to incorporate an engagement recess for receiving the stamp in the solidified contamination load in a saw-like or planing manner.
  • the clamping projections can be sawtooth-like or cutting-like in the direction of the continuous or oscillating superimposition movement.
  • the plunger narrows the outlet cross section of the filter belt outlet in the area of the solidified contamination load.
  • the stamp does not essentially have to perform a sealing function in this embodiment, the sealing problems of conventional sealing strips explained above are eliminated.
  • the outlet cross section of the filter belt outlet for releasing the filter belt is not increased, but the cross section of the contamination load of the filter belt is reduced relative to the predetermined outlet cross section of the filter belt outlet for this purpose.
  • the filter belt outlet has a constriction that engages behind the contamination load in the feed direction of the filter belt
  • the blocking device comprises a tool that removes the solidified contamination load of the filter belt at least apart from a cross section that can be moved past the constriction, in particular a motor-driven tool.
  • the tool can be a planing or milling tool that can be moved in translation.
  • a rotating milling tool is particularly suitable, the axis of rotation of which runs transversely to the feed direction of the filter belt and which removes the contaminant load parallel to the plane of the filter belt.
  • the milling tool reduces the level of the contaminant load loaded on the filter belt until it can pass through the narrowing of the filter belt outlet.
  • the constriction can be a constriction rib or the like, for example, provided stationary on the filter belt outlet.
  • the narrowing can also be formed by the tool itself.
  • the tool for the intermittent feed of the filter belt is only put into operation intermittently, it can possibly bake in a form-fitting manner with the contamination load of the filter belt during the break in operation.
  • the holding forces that occur can be so great that in individual cases it is impossible to restart the tool drive or is only possible with a very high drive power.
  • a preferred embodiment provides that the tool for the starting process of its drive can be brought completely out of engagement with the contaminant load.
  • the tool is expediently lifted from the solidified contaminant load during the filtering phase of the device and is only returned to the contaminant load after it has started up.
  • the feed channel for the material to be cleaned has a material distribution section that extends in the feed direction of the filter belt essentially over the entire area of a support surface of the support body that supports the filter belt and a passage that leads into the housing , Material supply section opening into the material distribution section and that the material supply section opens opposite to the feed direction of the filter belt against the center of the support surface of the support body provided with passage channels offset into the material distribution section.
  • the material feed section opens into the center of the material distribution section in order to achieve a uniform distribution of the material to be cleaned over the effective area of the filter belt supported on the support body.
  • the material feed section is preferably offset in the region of the end of the material distribution section opposite to the feed direction of the filter belt, so that the material to be cleaned flowing into the material distribution section under high pressure exerts a driving force on the filter belt due to its highly viscous properties in the feed direction.
  • the material distribution section tapers in the direction of advance of the filter belt, in particular tapers continuously.
  • the support body has, at least in the region of its support surface provided with passage channels and supporting the filter belt, a plurality of grooves which are parallel to one another and extend in the direction of displacement of the filter belt and open towards the support surface, of which the passage channels run out.
  • the passage channels are formed in the known support body as transverse to the grooves, longitudinally stepped bores that cut the grooves to form connection holes.
  • these connecting bores merge into transverse channels which are formed transversely in one end face of the support body and which open into a common collecting channel which removes the cleaned material.
  • the production of such channels is comparatively complex.
  • the surface roughness of their channel surfaces can only be reduced to a limited extent in such channels.
  • the aim is to reduce the flow resistance that the cleaning device opposes to the plastic melt by means of a measure that is technically simple to implement.
  • the support body has, at least in the region of its support surface provided with passage channels and supporting the filter belt, a plurality of grooves which are parallel to one another and extend in the feed direction of the filter belt and which are open to the support surface and from which the passage channels originate. and that the support body for forming the passage channels contains a plurality of cylindrical first connecting bores extending transversely to the grooves, which are connected to the crossed grooves via connecting holes.
  • each of the first connecting bores extends across at least a second one in the support body transversely to the first connecting bore. de, cylindrical connecting bore is connected to a collecting channel and that at least the first and second connecting bores have polished bore surfaces.
  • all sections of the connecting channels running within the support body are designed as cylindrical bores which, in contrast to groove-shaped sections of connecting channels of the conventional support body, can be polished without problems by rotating polishing tools. It has been shown that the flow resistance, which the highly viscous plastic melt finds, can be considerably reduced by polishing the connecting channels, as a result of which the extruder pressure to be applied for the cleaning process can also be reduced.
  • a plurality of second connecting bores are arranged distributed along each first connecting bore, which also avoids the step bores which are required in conventional support bodies for the end-side connection, but which are complex to manufacture and are staggered.
  • the first connecting bores can cut the grooves to form the connecting holes, as has been the case up to now.
  • the first connecting bores are connected to the grooves via boreholes drilled transversely to the support surface, in particular likewise polished.
  • Such a support body is extremely stable in the area of its support surface and nevertheless has approximately uniform material drainage properties distributed over its support surface.
  • the grooves and / or the collecting channel for reducing the flow resistance of the highly viscous plastic melt also have polished wall surfaces.
  • the region of the support surface containing the grooves can be divided into sub-regions in which the grooves arranged there are offset across their longitudinal direction to prevent the filter belt from being partially separated by the webs forming the support surfaces between the webs Grooves is blocked.
  • the area of the support surface of the support body provided with the passage channels can be flat in a manner known per se or curved convexly in the feed direction.
  • the support surface can be semi-cylindrical in order to achieve high cleaning performance with small dimensions of the cleaning device.
  • the filter belt in multiple layers so that it has an endless support layer adjacent to the support body and a filter layer resting on the support layer on the side facing away from the support body, the filter layer being more finely meshed than the support layer.
  • This idea which is known per se, can also be used advantageously in the context of the aspects of the invention explained above, since it lowers the operating costs of the cleaning device.
  • a simple wire filter fabric that can only be used once can be used for the finer-meshed filter layer, while the endless support layer can consist of mechanically stable but expensive "armored fabric tape". Since primarily the filter layer is loaded with the contaminant load, most of the contaminant load can be removed from the support layer together with the filter layer, which considerably simplifies the cleaning of the surrounding support layer.
  • the housing containing the support body has a removable side wall which can be removed in the manner of a cover in order to be able to remove the filter band.
  • the side wall In view of the high pressure of the plastic melt, which the housing has to withstand, the side wall must be screwed tightly to the housing.
  • channels for a heating or cooling fluid that pass into the rest of the housing and thus have to be sealed run in the side wall.
  • the disassembly and assembly of the side wall is correspondingly complex and is further complicated by the comparatively large weight of the side wall.
  • the housing has a slot along an edge of the filter band that extends to the filter band and extends over the entire section of the filter band that runs inside the housing and that passes through a one- or multi-part, removable bar can be closed. Due to the comparatively small slot width, the compressive forces acting on the bar are comparatively low, which simplifies the design and fastening of the bar. Coolant and heating medium ducts can easily be laid outside the bar.
  • FIG. 1 shows a schematic side view of an apparatus for cleaning solid-state contaminants from thermoplastic material
  • Figure 2 is a sectional view through the cleaning device, seen along a line II-II in Figure 1
  • Figure 3 is a support surface view of a support body provided in the cleaning device of Figure 1, seen along a
  • FIG. 4 shows a sectional view of a variant of a device for cleaning thermoplastic material
  • FIG. 5 shows a detailed view of the device, seen along a line VV in FIG. 4.
  • the device shown in Figures 1 and 2 for cleaning thermoplastic material from solid contaminants, such as metal waste or the like, has a housing 1, the plastic material to be cleaned is fed at high pressure in a highly viscous state, for example from an extruder press or the like, via a feed channel 3 , The cleaned material is discharged via a discharge channel 5.
  • the flow path between the feed channel 3 and the discharge channel 5 is sealed in the housing 1 by a multilayer filter belt 7, which will be explained in more detail below and which on its side facing away from the feed channel 3 in the flow path of the plastic melt on a fixed support body 1 inserted into a chamber 9 of the housing 1 1 rests to absorb the high pressure of the plastic melt.
  • the support body 11 has a multiplicity, generally designated 13, of passage channels which start from its flat support surface 15 and open into a collecting channel section 17 of the discharge channel 5.
  • the filter belt 7 is loaded with an impurity load, indicated at 19, which consists of the solid impurities and a proportion of plastic melt.
  • an impurity load indicated at 19, which consists of the solid impurities and a proportion of plastic melt.
  • the filter belt 7 is moved continuously or stepwise in the direction of an arrow 21 (FIG. 1) and the contaminant load 19 is thus transported out of the housing.
  • the filter band 7 enters the housing 1 unloaded at a slit-like narrowed filter band inlet 23 and exits at an equally narrowed slit-like filter band outlet 25.
  • the filter belt inlet 23 and the filter belt outlet 25 are assigned cooling devices 27 and 29, here in the form of cooling passages through which coolant flows, which melt and / or melt the plastic Cool the plastic portion of the contamination load 19 in the area of the filter belt inlet 23 and the filter belt outlet 25 to the solidification temperature.
  • the filter- The band inlet 23 and the filter band outlet 25 are therefore sealed by "plastic plugs”.
  • heating channels 31 through which a heat transfer medium flows are assigned to the housing 1, and the housing 1 is thermally insulated from the cooling zones at the filter belt inlet 23 and at the filter belt outlet 25 by insulation means 33, here in the form of heat insulation slots. It goes without saying that the housing 1 can also be heated in some other way, for example by means of electrical heating means.
  • the inlet slot of the filter belt inlet 23 widens in the feed direction of the filter belt 7, so that the solidified plastic plug is drawn into the heated area of the housing 1 during the feed movement of the filter belt 7 and melts there again.
  • the outlet cross-section in the area of the filter belt outlet 25 is larger than the inlet cross-section in the area of the filter belt inlet 23. Due to the cross-sectional difference, a static differential pressure acts which tries to push the filter belt 7 in the feed direction 21.
  • a controllable blocking device 35 blocks the ejection movement of the contamination load of the filter belt 7, which has already cooled to the solidification temperature before reaching the filter belt outlet 25 and thus solidifies to an essentially rigid plug.
  • the outlet cross section in the solidification area of the filter belt outlet 25 has a constant cross section in the feed direction. however, preferably a cross section which widens slightly in the feed direction, so that the contaminant load can also be discharged in the solidified state.
  • the blocking device 35 has a punch 37 arranged on the side of the contamination load 19, which extends in the form of a bar across the filter belt 7 and is pressed by a hydraulic cylinder 39 to block the feed movement against the solidified contamination load or to release the Feed movement is lifted from this.
  • the punch 37 has sawtooth-shaped clamping projections 41 in the feed direction, with which it can penetrate into the solidified contamination load of the filter belt 7 while reducing the outlet cross section of the filter belt outlet 25 available for the passage of the filter belt 7 and its contamination load.
  • the stamp 37 can optionally be heated locally.
  • filter band inlet 23 and filter band outlet 25 could be chosen to be so large that the filter band is displaced solely by the hydrostatic differential pressure.
  • an additional transport device 43 is provided, which includes a hydraulically closable clamping jaw 45 on the filter belt 7 whose contamination load is able to attack and the filter belt 7 is moved step by step in the feed direction 21.
  • the clamping jaws 45 are guided on a guide 47 so as to be displaceable in the feed direction 21 and are moved back and forth by a hydraulic cylinder 49. Further details of such a transport device are explained in WO98 / 31527, to which reference is made for this.
  • the material flow of the highly viscous plastic melt supplied via the feed channel 3 is also used to support the feed movement of the filter belt 7.
  • the feed channel 3 comprises a material distribution section 51 which extends over the entire support surface 15 of the support body 11 and into which the material to be cleaned is fed via a material feed section 53 in the region of the end of the material distribution section 51 adjacent to the filter band inlet 23. From this end of the material distribution section 51 which is opposite the feed direction 21, the material distribution section 51 tapers in the feed direction of the filter belt 7 at least in the region of the support body 11, but preferably up to or near the beginning of the cooling zone 29 of the filter belt outlet 25.
  • the plastic melt thus flows in Essentially exclusively in the feed direction of the filter belt 7 and, due to its high viscosity, takes the filter belt 7 in the feed direction. Since the material distribution section 51 tapers in the feed direction, the material outflow through the filter belt 7 is compensated in the sense of an equalization of the material flow in the feed direction.
  • the support surface 15 of the support body 11 contains a plurality of mutually parallel grooves 55 which extend in the feed direction 21 , from whose bases 5 5 recessed floors extend the passage channels 13.
  • the support surface 15 is accordingly formed by the ribs 57 remaining between adjacent grooves 55.
  • the grooves 55 are also offset here in two sections successive in the feed direction of the filter belt 7 transversely to the feed direction, which enables a more uniform loading of the filter belt 7 with the contaminant load.
  • the support body 11 contains a plurality of mutually parallel cylindrical bores 63, which are sealed at their ends by plugs 65.
  • Each of the bores 63 is connected to each groove 55 which it crosses through a bore 67 extending from the groove bottom and extending transversely to the support surface 15.
  • Averted from the support surface 15, at least one, but preferably several, of each connecting bore 63 are spaced apart extending connecting bores 69, which in turn connect the connecting bores 63 to the collecting duct 17, which extends in the housing 1, of the discharge duct 5 which discharges the cleaned material.
  • the through bores 67 and the connecting bores 63 and 69 all have a circular cylinder cross section and are polished in order to keep the flow resistance of the cleaned plastic melt carried away by them as low as possible, so that the cleaning device can work with the lowest possible melt pressure. It goes without saying that the grooves 55 and the collecting duct 17 as well as the ducts 3 and 5 can optionally have polished inner surfaces.
  • the filter belt 7 is of multi-layer construction and, in the exemplary embodiment shown, has an endless support layer 73, which is guided with the aid of deflection guides 71, from a mechanically very stable wire mesh or the like which can also be subjected to higher tensile and compressive forces, and one on which the support body 1 1 is turned away Filter layer 75 lying on the side of the support layer 73.
  • the filter layer 75 likewise consists of a wire mesh, but is simpler and therefore considerably cheaper in design than the support layer 73.
  • the filter layer 75 as a "disposable filter tape", comes from a supply roll 77 outside the housing 1 onto the Support layer 73 placed.
  • the filter pore size of the filter layer 75 is smaller than the opening size of the support layer 73.
  • the filter layer 75 loaded with the contamination load is separated from the support layer 73 in a cleaning station 79 by means of a preferably heated doctor blade 81 and disposed of together with the contamination load deposited thereon.
  • the support layer 73 is cleaned in the cleaning station 79 and again fed to the plastic cleaning device on its endless path.
  • the cleaning station 79 comprises a heating device 83, which heats the filter belt 7 to the softening temperature of the contamination load before the filter layer 75 is separated off, and device 85, which blows off any residues of the contamination load that may remain on the support layer 73.
  • the cleaning station 79 can optionally include further scrapers or other cleaning devices, as is explained, for example, in WO98 / 31527 or DE 199 16 539 A1.
  • the housing 1, including the adjoining areas for the filter belt inlet 23 and the filter belt outlet 25, is along one of the two edge edges of the filter belt 7 with one reaching from the outside to the edge edge of the filter belt 7
  • Provide slot 84 ( Figure 2), which is closed to the outside by a strip 86.
  • the ledge 86 completely fills the slot 84 to avoid dead spaces for the plastic material within the housing and is fastened outside the slot.
  • the bar has a T-shaped cross section. For ease of assembly, the bar can be segmented in its longitudinal direction.
  • FIGS. 1 to 3 A variant of the cleaning device explained with reference to FIGS. 1 to 3 is described below. Components having the same effect are provided with the reference numbers from FIGS. 1 to 3 and for distinction with the letter a. To explain the structure and the mode of operation, reference is made to the description of FIGS. 1 to 3. The components 9, 15 to 19, 59, 61 and 65 shown in FIGS. 1 to 3 are not shown in FIGS. 4 and 5, but are present in a corresponding manner.
  • the support body 11 a is the 4 and 5 shown cleaning device curved and sets according to a half-cylinder section continues towards the filter band inlet 23a and towards the filter band outlet 25a along flat support surface regions 87 and 89, respectively.
  • the filter belt 7a wraps around the curved support surface area of the support body 11a over a wrap angle of approximately 180 °.
  • the support body 1 1 a corresponds in this respect to the support body of the cleaning device described in WO98 / 31 527, to which reference is made in connection with FIGS. 4 and 5 for further explanation of the cleaning device.
  • the support surface of the support body 1 1 a is in turn provided with a plurality of grooves 55 a running in the feed direction 21 a of the filter belt 7 a, which in this embodiment of the cleaning device can also be divided into two successive partial regions in the circumferential direction, in which the grooves 55 a for better utilization of the Filter bands transverse to the feed direction 21a can be offset from one another to a gap, as was explained above with reference to FIG. 3 and is also described in WO98 / 31 527.
  • the support body 11a contains polished connection bores 63a running transversely to the grooves 55a, the circumference of which bores intersect the grooves 55a to form the connection holes 67a. It goes without saying that the connecting bores 63a can also be arranged at a radial distance from the grooves and connected to the grooves by optionally polished connecting bores, as was explained above with reference to FIG. 2.
  • Each of the connecting bores 63a is moreover connected to a central discharge channel 5a designed as a collecting channel via a plurality of radial, polished connecting bores 69a running inside the support body 11a.
  • This channel is also expediently designed and polished as a cylindrical bore.
  • the area of the support body 1 1a provided with through holes 67a and connecting bores 63a, 69a does not only extend over the cylindrical one curved part of its support surface, but also partly into the flat support surface regions 87, 89. In this way, a comparatively large usable filter area can be achieved despite the compact design.
  • the plastic material to be cleaned is distributed by means of a material distribution section 51 a tapering in the feed direction 21 a over the support surface area of the support body 1 1 a provided with through holes 67 a.
  • the plastic distribution section 51 a is supplied with the plastic material to be cleaned via a material feed section 53 a of the feed channel 3 a in the region of the end of the support surface area of the support body 1 1 a that is opposite the feed direction 21 a, in order in this way to reduce the viscous friction of the along the filter belt 7a flowing plastic melt to support the transport movement of the filter belt 7a.
  • thermally insulated cooling devices 27a, 29a are again provided by thermal insulations 33a from the heated housing 1a, which cool the plastic melt to form solidified plastic sealing plugs.
  • the sealing plug formed at the filter belt inlet 23a is carried along during the transport movement of the filter belt 7a due to the widening cross-sectional configuration of the filter belt inlet 23a.
  • FIG. 4 shows in an exaggerated representation that the solidified area of the contamination load 19a widens from the filter belt outlet 25a.
  • the blocking device 35a also comprises a cylindrical milling tool 97, driven by an electric motor 93 and rotating about a rotation axis 95 parallel to the plane of the filter belt 7a and transverse to the feed direction 21a, with cutting edges 99 arranged in a helical manner. ben, the milling tool 97 mills off the area of the solidified contamination load 19a protruding beyond the blocking bar 91, with which the filter belt 7a, including any remaining portion of the contamination load 19a, can leave the filter belt outlet 25a.
  • the milling tool 97 is operated intermittently for a gradual advance of the filter belt 7a.
  • the milling tool 97 is free of the contamination load 19a during the break in operation can be lifted off and thus disengaged, as indicated in FIG. 4 at 97 '. In this way, the motor 93 can start as long as the milling tool 97 is not yet in engagement with the contamination load 19a.
  • the blocking bar 91 can optionally be omitted if the milling tool 97 remains in constant engagement with the contamination load 19a, that is to say also takes over the function of the blocking bar 91.
  • the blocking can also take place by means of a milling tool, instead of using a blocking punch, as was explained with reference to FIG. 1.
  • a milling tool can also be used instead of the blocking plunger.
  • the filter belt 7a of the cleaning device according to FIG. 4 is designed as an endless belt and is guided on the one hand on the cylindrical section of the support body 11a and on the other hand on a rotatable deflection wheel 71a.
  • the transport device 43a provided to support the transport movement of the filter belt 7a comprises a clamping jaw 45a, which a hydraulic cylinder 49a presses radially against the circumference of the deflection wheel 71a. Details of such a transport device are explained in WO98 / 31527, to which reference is made.
  • a cleaning station 79a is arranged between the housing 1a and the deflection wheel 71a, which frees the rotating and therefore reusable filter belt 7a from residues of any contaminant load still adhering to it.
  • the filter belt 7a first passes through a scraping device 101, in which it is preheated by the heating device 83a and is roughly freed of the contaminant load by means of the scraper 81a.
  • the scraping device 101 is followed by a fluidized bed cleaning device 103, in which the filter belt is heated to a higher temperature than before by means of a further heating device 105 and is further cleaned by a particle stream, for example a sand stream.
  • a blow-out station 109 follows for the final cleaning, in which the filter belt 7a is blown with a hot air stream supplied via the nozzle 85a. Details of the cleaning station 79a are explained in WO98 / 31527. Reference is made to the explanations.
  • the filter band 7a is designed as a single-layer metal fabric band.
  • a multi-layer version of a filter belt with an endless, coarsely meshed support layer and a finer meshed one for single single use certain filter layer can be used, as was explained with reference to Figures 1 to 3.
  • a single-layer filter belt can also be used in the embodiment of FIGS. 1 to 3.
  • the transport device shown in FIG. 1 can also be provided in a cleaning device according to FIG. 4, or the transport device of FIG. 4 can be used in the variant of FIG. 1.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un dispositif d'épuration de matériau thermoplastique d'impuretés solides, comportant un boîtier (1) pourvu d'un canal d'alimentation (3) de matériau à épurer et d'un canal d'évacuation (5) de matériau épuré. Dans le boîtier, le chemin d'écoulement du matériau est traversé par une bande de filtrage (7) destinée à séparer les impuretés solides, pouvant coulisser longitudinalement, logée de manière étanche entre le canal d'alimentation (3) et le canal d'évacuation (5). Un corps support (11) comportant une pluralité de canaux d'écoulement (13) destinés au passage du matériau épuré vers le canal d'évacuation (5) est logé dans le sens d'écoulement sur le côté de la bande de filtrage (7) orienté vers le canal d'évacuation (5). Des moyens d'étanchéification (27, 29) étanchéifiant la bande de filtrage (7) par rapport au boîtier (1) sont logés au niveau de l'entrée de bande de filtrage (23) et de la sortie de la bande de filtrage (25). La bande de filtrage (7) est déplacée vers l'avant de manière continue ou par étapes par l'intermédiaire d'un dispositif de transport (43). Les moyens d'étanchéification de la sortie de bande de filtrage (25) refroidissent la charge d'impuretés (19) de la bande de filtrage contenant une partie de matériau thermoplastique jusqu'à environ l'état de solidification. Un dispositif de blocage commandable (35) est disposé sur la sortie de bande de filtrage (25), ledit dispositif servant à modifier relativement la section de la sortie de bande de filtrage (25) et la section de la bande de filtrage (7) chargée de la charge d'impuretés (19) pour le blocage ou la libération du mouvement d'avancement de la bande de filtrage (7). Ce dispositif de blocage peut comporter un piston de blocage (37) réduisant de manière commandable la section de sortie, ou un outil motorisé tel qu'un outil de fraisage réduisant la section de la charge d'impuretés jusqu'à une valeur dépassant par le bas la section de sortie de la sortie de bande de filtrage (25).
PCT/EP2001/007463 2000-06-30 2001-06-29 Dispositif d'epuration de materiau thermoplastique WO2002000321A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01967109A EP1294463A1 (fr) 2000-06-30 2001-06-29 Dispositif d'epuration de materiau thermoplastique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10031977.7 2000-06-30
DE10031977 2000-06-30
DE10103990A DE10103990A1 (de) 2000-06-30 2001-01-30 Vorrichtung zum Reinigen thermoplastischen Materials
DE10103990.5 2001-01-30

Publications (1)

Publication Number Publication Date
WO2002000321A1 true WO2002000321A1 (fr) 2002-01-03

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WO (1) WO2002000321A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130597A1 (it) * 2013-04-12 2014-10-13 Alfatech Srl Dispositivo cambia-filtro automatico
WO2016131072A3 (fr) * 2015-02-19 2016-12-08 Next Generation Analytics Gmbh Filtre à bande
EP3292981A1 (fr) * 2016-09-08 2018-03-14 Next Generation Analytics GmbH Procédé et dispositif de filtration de liquides visqueux ou à forte viscosité en particulier de matières plastiques fondues

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Publication number Priority date Publication date Assignee Title
CH469547A (de) * 1967-02-21 1969-03-15 Gabor Dr Kalman Peter Verfahren zum Filtrieren von flüssigen Materialien, insbesondere warmweichem Kunststoff, sowie Vorrichtung zur Durchführung des Verfahrens
DE1944704A1 (de) * 1968-09-03 1970-03-12 Kalman Peter Gabor Filterverfahren und Vorrichtung zur Durchfuehrung desselben
FR2332113A1 (fr) * 1975-11-24 1977-06-17 Rigot Stalars & Vandesmet Procede et dispositif de filtrage automatique de matieres plastiques
DE3535491C1 (de) * 1985-10-04 1987-04-02 Lucian Britchi Vorrichtung fuer die Reinigung von viskosen Materialien
WO1992006763A1 (fr) * 1990-10-18 1992-04-30 The Dow Chemical Company Filtre continu
WO1998031527A1 (fr) * 1997-01-14 1998-07-23 Josef Gail Dispositif pour nettoyer des matieres visqueuses
DE19916539A1 (de) * 1999-04-13 2000-10-19 Josef Gail Reinigungsvorrichtung für viskose Materialien

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH469547A (de) * 1967-02-21 1969-03-15 Gabor Dr Kalman Peter Verfahren zum Filtrieren von flüssigen Materialien, insbesondere warmweichem Kunststoff, sowie Vorrichtung zur Durchführung des Verfahrens
DE1944704A1 (de) * 1968-09-03 1970-03-12 Kalman Peter Gabor Filterverfahren und Vorrichtung zur Durchfuehrung desselben
FR2332113A1 (fr) * 1975-11-24 1977-06-17 Rigot Stalars & Vandesmet Procede et dispositif de filtrage automatique de matieres plastiques
DE3535491C1 (de) * 1985-10-04 1987-04-02 Lucian Britchi Vorrichtung fuer die Reinigung von viskosen Materialien
WO1992006763A1 (fr) * 1990-10-18 1992-04-30 The Dow Chemical Company Filtre continu
WO1998031527A1 (fr) * 1997-01-14 1998-07-23 Josef Gail Dispositif pour nettoyer des matieres visqueuses
DE19916539A1 (de) * 1999-04-13 2000-10-19 Josef Gail Reinigungsvorrichtung für viskose Materialien

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20130597A1 (it) * 2013-04-12 2014-10-13 Alfatech Srl Dispositivo cambia-filtro automatico
EP2789447A1 (fr) * 2013-04-12 2014-10-15 Alfatech S.R.L. Dispositif changeur automatique d'écran
US10307953B2 (en) 2013-04-12 2019-06-04 Alfatech S.R.L. Automatic screen changer device
WO2016131072A3 (fr) * 2015-02-19 2016-12-08 Next Generation Analytics Gmbh Filtre à bande
WO2016131071A3 (fr) * 2015-02-19 2016-12-08 Next Generation Analytics Gmbh Dispositif et procede de filtration
US10807295B2 (en) 2015-02-19 2020-10-20 Next Generation Analytics Gmbh Filter device and filter method
EP3292981A1 (fr) * 2016-09-08 2018-03-14 Next Generation Analytics GmbH Procédé et dispositif de filtration de liquides visqueux ou à forte viscosité en particulier de matières plastiques fondues

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