US20210162324A1 - Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids - Google Patents
Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids Download PDFInfo
- Publication number
- US20210162324A1 US20210162324A1 US17/174,914 US202117174914A US2021162324A1 US 20210162324 A1 US20210162324 A1 US 20210162324A1 US 202117174914 A US202117174914 A US 202117174914A US 2021162324 A1 US2021162324 A1 US 2021162324A1
- Authority
- US
- United States
- Prior art keywords
- filter
- plate
- chamber
- cleaning
- support plate
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 title claims abstract description 28
- 238000001914 filtration Methods 0.000 title claims abstract description 21
- 239000000155 melt Substances 0.000 title abstract description 24
- 239000004033 plastic Substances 0.000 title abstract description 10
- 229920003023 plastic Polymers 0.000 title abstract description 10
- 238000004140 cleaning Methods 0.000 claims description 84
- 239000000356 contaminant Substances 0.000 claims description 34
- 239000012065 filter cake Substances 0.000 claims description 19
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 28
- 238000001816 cooling Methods 0.000 description 9
- 238000011109 contamination Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- B01D33/01—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons
- B01D33/015—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with flat filtering elements
- B01D33/0183—Filters with filtering elements which move during the filtering operation with translationally moving filtering elements, e.g. pistons with flat filtering elements supported
-
- 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
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
- B29C48/2528—Drive or actuation means for non-plasticising purposes, e.g. dosing unit
-
- 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
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
-
- 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
- B29C48/254—Sealing means
- B29C48/2545—Sealing means for 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
- B29C48/256—Exchangeable extruder parts
-
- 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
- B29C48/27—Cleaning; Purging; Avoiding contamination
- B29C48/2725—Cleaning; Purging; Avoiding contamination of filters
- B29C48/273—Cleaning; Purging; Avoiding contamination of filters using back flow
-
- 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
- B29C48/27—Cleaning; Purging; Avoiding contamination
- B29C48/2725—Cleaning; Purging; Avoiding contamination of filters
- B29C48/2735—Cleaning; Purging; Avoiding contamination of filters using scrapers
-
- 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
- B29C48/503—Extruder machines or parts thereof characterised by the material or by their manufacturing process
-
- 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
- B29C48/691—Arrangements for replacing filters, e.g. with two parallel filters for alternate use
- B29C48/6912—Arrangements for replacing filters, e.g. with two parallel filters for alternate use the filters being fitted on a single rectilinearly reciprocating slide
-
- 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
Definitions
- the invention relates to a method and an apparatus for filtering viscous or highly viscous liquids, in particular plastics melts, using a filter plate.
- the prior art generally uses filtration apparatuses which use various filter embodiments.
- Contaminants which frequently occur in viscous or highly viscous liquids are for example organic or inorganic contaminants, such as metals, mineral substances and the like, or contaminants resulting from other polymers, foreign particles, excessively coarse added substances and additives and agglomerates thereof.
- Further problematic contaminants are for example degradation products of the viscous or highly viscous liquid, which arise in use, production or other proper or improper uses, for example exposure to excessive temperatures, or during production, for example in the case of plastics, by excessive or inadequate crosslinking, such as for example gels.
- the filters used in this respect are in particular sieve plates or indeed filter belts or “belt filters”.
- the openings in the corresponding filter must be smaller than the contaminants to be retained and separated from the viscous or highly viscous liquid.
- the degree of contamination of the respective filter unit used increases more or less quickly as a function of the degree of contamination of the viscous or highly viscous liquid and the throughput thereof through the filtration apparatus. In the worst case, this may result in as good as no liquid any longer being able to pass through the filter.
- a sieve plate must therefore for example be replaced or back-flushed. Cleaning then proceeds as a function of the degree of contamination or pressure build-up or at fixed times.
- the filter is cleaned, for example, by rotating a plate provided with fine holes or a cylinder, or cleaning is performed constantly by a rotating scraper or a screw mounted in the material stream on the sieve surface.
- the contaminants are conveyed outwards through suitable transport ducts and pressure-reducing mechanisms.
- a disadvantage here is the mechanical contact between the cleaning apparatus and the sieve plate or the filter belt, which, in particular in the case of high levels of mineral or metallic contamination, leads to high levels of wear to the sieve plate or the filter belt. Moreover, in most systems relatively large dead volumes arise, with long material holding times, which may lead to melt degradation.
- melt does not flow through the cleaning zone and a “food mill effect” arises, i.e. comminution of the contaminants and thus passage of the contaminants through the filter plate.
- a filter apparatus is known from DE 10 2016 202 489 which comprises an inlet chamber, an outlet chamber and a filter system separating inlet chamber and outlet chamber, wherein the inflow direction of the liquid to be filtered is at an angle of between 10° and 90°, in particular between 30° and 70°, relative to the surface normal of the filter. This tangential inflow to the filter enables very small chamber volumes.
- the object of the present invention is to provide a filter apparatus for filtering viscous or highly viscous liquids, in particular plastics melts, which allows continuous operation and additionally the avoidance of the disadvantages of the prior art, in particular wear to the filter plate.
- the present invention accordingly provides a filter system comprising a filter plate situated in a filter chamber, which is supported by a filter support plate, characterized in that either the filter plate is guided on the filter support plate by sliding elements in grooves or the filter support plate with the filter plate situated thereon is guided in the filter chamber by sliding elements and the filter plate or the filter plate together with the filter support plate is guided in an oscillating motion to clean the filter plate.
- the present invention also provides a method for filtering viscous or highly viscous liquids, in particular plastics melts, including the following method steps
- the filter zone is that region in which the liquid to be filtered passes through the filter plate and the filter support plate.
- the filter plate may be embodied as a solid sieve plate or indeed consist of a stack of one or more filter mats or sheets.
- the sieve plate may in this case take the form of a solid plate with holes, which are produced for example by drilling, electric discharge machining, water jet, lasers, electron beam, particle beams (for example protons), by etching or the like.
- the filter plate is preferably at least twice as wide as the active filter area in the filter zone.
- the filter plate or the filter support plate is guided at the bottom and sides for example via sliding elements in grooves, wherein the sliding elements may consist of low-wear materials or bearing materials, such as for example copper, aluminium bronzes, sintered elements or the like.
- the melt itself may here also form a thin lubricant film.
- the filter plate may be supported in the filter chamber by a filter support plate, which likewise comprises openings for passage of the melt.
- the filter support plate is in any event embodied in such a way that it ensures an optimum compromise between permeability, i.e. low flow resistance, and optimum strength.
- the openings in the filter support plate may be round, polygonal, in the form of elongate holes and the like and arranged perpendicular or at an angle to the surface in order for example to allow better flow distribution.
- the cross-section and directions may also vary in the longitudinal profile of the openings.
- the filter support plate may moreover take the form of a plurality of layers, materials and combinations.
- the surface may be embodied with a particularly friction-reducing soft or hard layer or texture in order for example to facilitate sliding of the filter element.
- a particularly firm, tension-resistant material may be arranged under the surface of the filter support plate.
- the filter support plate here consists for example of hardened steel, on the surface of which is applied a material with good sliding properties, such as for instance bronze.
- the filter plate may be moved to and fro, i.e. oscillated, in the filter chamber over the stationary filter support plate during the filtration process.
- the stationary filter support plate then acts as a separator in the melt stream.
- the entire filter plate with the filter support plate arranged therebelow may oscillate, said filter support plate at the same time absorbing the force arising from the pressure difference in the melt stream.
- the filter plate may take the form of a thin plate, sheet or mat, since it does not have to absorb any thrust forces.
- the force which is needed to move the filter plate and the filter support plate necessary is in this case greater than in a case where only the filter plate is moved.
- a combination of these embodiments is, however, also possible, wherein for example a compact but thin filter plate is oscillated over a filter support plate. Suitable measures must then be taken to absorb the higher friction forces which arise as a result of the high melt pressure. This is achieved in particular by the sliding elements being of low-wear materials or bearing materials.
- Motion or oscillation of the filter plate or of the filter plate and the filter support plate may be brought about by an electrical, hydraulic, pneumatic or other mechanical drive.
- a cleaning chamber is arranged on one or both sides of the filter chamber.
- This cleaning chamber is arranged somewhat higher in the filter inflow direction than the filter plate itself, in order additionally to take up contaminants at the surface.
- the cleaning chamber is embodied by blocking elements which, alone or in combination additional cleaning elements, seal the cleaning chamber relative to the filter chamber.
- Scraper units may preferably be considered as cleaning elements.
- the scrapers themselves are mounted replaceably on a base unit.
- the scrapers may in this case consist of metals or alloys.
- Sandwich structures may however also be provided, which are in each case also provided with different surface coatings such as PVD or CVD, DLC or ceramic layers, or of plastics and combinations thereof. What is essential here is the combination of the materials of scraper and sieve, in order on the one hand to enable optimum cleaning and on the other hand to keep wear levels low.
- the contact pressure may be varied virtually at will so as to enable an optimum cleaning action with minimum filter wear.
- the filter plate is moved by at least one slider, which seals the cleaning chamber from the outside.
- the filter plate may ultimately be embodied such that sealing is achieved by raising the filter plate to the height of the cleaning chamber itself.
- sealing and/or cleaning elements may also be arranged in series.
- an outflow duct which may comprise corresponding elements such as active or passive screws, helices or labyrinth-type structures, is opened by means of a valve or by the geometry of the filter plate. Moreover, the outflow duct may be separated thermally from the filter and in this way the viscosity of the outflowing material may be purposefully influenced by dedicated heating or cooling systems.
- a profile channel may here be mounted along the slider, for example, via which the contaminants are passed to a duct incorporated into the slider.
- this slide valve is in contact with the filter.
- the duct incorporated into the slider lies in the same plane as a bore in the slider support plate and thus opens up a duct to the outside directly or by way of above-stated pressure-reducing elements, via which duct the contaminants are passed to the outside.
- the filter plate is then moved in the opposite direction.
- the slider or the end of the filter plate then reduces the volume of the cleaning chamber and at the same time the surface of the filter plate is cleaned by the blocking wedges or additional scraper profiles, rotating screws, rollers and the like.
- the contaminants are discharged into the cleaning chamber together with the remainder of the melt.
- the sliders or cleaning elements are arranged for example obliquely or also in the shape of a V.
- two ducts are provided.
- the filter is cleaned on one side only to a good half or preferably a good 1 ⁇ 3 of the total length of the filter in the first chamber and at the same time is introduced on the opposite side into the second symmetrically arranged chamber.
- material is forced actively by an actively driven valve or by corresponding overflow ducts from the clean side towards the now almost pressureless opposite side in the cleaning chamber.
- a volume of material with filtered material may also be provided on the bottom of the cleaning chamber in such a way as to enable a stream of cleaned material at the bottom during movement of the filter into the cleaning chamber.
- overflow ducts are provided which are open in the end position of the support or filter plate. During the cleaning motion, these overflow ducts are closed and the clean material is forced from underneath through the filter support plate and the filter plate.
- melt may also be filtered into the filter chamber and through the filter plate, such backflushing may also take place to a lesser degree without the use of overflow ducts.
- two filter chambers are each connected to a common melt duct by means of a switchable valve, in such a way that, when the valve is in the one state, the melt runs through the first filter chamber and, when the switchable valve is in the other state, the melt runs through the second filter chamber.
- the valve is configured such that parallel operation is possible.
- Three or more filter chambers may also be connected in parallel by way of such valves, such that at least one of the filters always ensures melt flow.
- two or more filter chambers may be arranged one above the other or next to one another in series, such that the outflow of the preceding one is connected to the inflow of the subsequent one and the melt passes successively through the two or more belt filters.
- Discharge of the contaminants in the form of the filter cake may proceed sideways in the direction of the sieve motion or at 90° thereto or upwards. What is important here is that in the process the contaminants undergo a pressure reduction to atmospheric pressure.
- a helix or conveying screw may convey the material outwards on each side or, if the discharge ducts converge, this may proceed with a common helix or conveying screw. No further excessive degradation of the melt must take place in the process, so as not to generate deposits in the discharge region.
- the material may however be actively cooled during discharge, such that only high-viscosity or even solidified contaminants arrive outside.
- a cold duct decoupled thermally from the heated system is provided in the filter.
- FIGS. 1 to 9 show embodiments according to the invention.
- FIGS. 1 to 9 show embodiments according to the invention.
- FIGS. 1 to 9 show embodiments according to the invention.
- FIGS. 1 a -1 c show a method for cleaning the filter
- FIGS. 2 a -2 c show a method for cleaning the filter with free back-flushing
- FIGS. 3 a -3 c show a filtration method with forced back-flushing
- FIG. 4 shows an embodiment of the filter
- FIG. 5 shows an embodiment of the filter in which only the filter plate is oscillated
- FIG. 6 shows an embodiment for conveying away the filter cake
- FIG. 7 shows an embodiment in which the filter cake is conveyed away in a controlled manner by a conveying screw
- FIG. 8 shows cooling ducts in the cleaning chamber for conveying away the filter cake
- FIGS. 1 a -1 c show a method for cleaning the filter in which the filter is cleaned without back-flushing.
- the device consists in this respect of a filter chamber 1 and a filter plate 2 , which is supported by a filter support plate 3 .
- the contaminants settle on the filter plate 2 as filter cake 4 during the course of the process of filtering a viscous or highly viscous liquid 10 .
- the valve 6 which in this case takes the form of a piston, is actuated and the filter cake 4 is passed into the cleaning chamber 5 and removed from the cleaning chamber through the duct 7 . Removal of the filter cake 4 proceeds by displacing the filter plate 2 optionally together with the filter support plate 3 in the direction of the arrows, wherein the filter plate 2 is transported to a second cleaning chamber 5 a and the process for complete cleaning of the filter plate is carried out.
- FIGS. 2 a -2 c show a method for cleaning the filter with free back-flushing.
- the pressure difference up- and downstream of the filter plate 2 which arises during cleaning of the filter ensures that some of the filtrate 11 from the melt chamber is forced back for back-flushing 15 through the filter support plate 3 and the filter plate 2 in the back-flushing zone 21 below the filter cake 4 ( FIG. 2 b ).
- the filter cake 4 is lifted up by the back-flushed melt 15 a and in this way forced more readily into the duct 7 of the cleaning chamber 5 .
- Removal of the filter cake 4 proceeds by displacing the filter plate 2 optionally together with the filter support plate 3 in the direction of the arrows, wherein the filter plate 2 is transported to a second cleaning chamber 5 a and the process for further cleaning of the filter plate is carried out.
- FIGS. 3 a -3 c show a filtration method with forced back-flushing.
- the back-flushing process is initiated by sealing the back-flushing zone 15 by the slider motion.
- the filter system here comprises an additional shut-off element 19 .
- the material is forced through the filter from below with elevated pressure and the filter plate cleaning process is carried out as in the procedure shown in FIG. 2 .
- FIG. 4 shows an embodiment of the filter, in which filter plate 2 and filter support plate 3 oscillate together, i.e. are pushed to and fro.
- the filter support plate 3 is here mounted in the filter chamber 1 on plain bearings 8 .
- FIG. 5 shows an embodiment of the filter in which only the filter plate 2 is oscillated.
- the filter plate 2 is mounted on plain bearings 8 which are situated on the filter support plate 3 .
- FIG. 6 shows an embodiment for conveying away the filter cake 4 out of the cleaning chamber.
- in duct 7 modification of the cross-section reduces the pressure from a pressure level P1 to a pressure level P0, the filter cake 4 thereby being conveyed out of the duct
- filter cake 4 is conveyed away in a controlled manner by means of a conveying screw 9 .
- cooling ducts 14 are provided in the cleaning chamber for conveying away the filter cake 4 , such that the pressure in the cleaning chamber is reduced by cooling.
- the insulating layer 13 serves to decouple the temperature of the discharge duct 7 , and thus the temperature of the material to be discharged may be reduced and the viscosity increased by a lower temperature than in the filter.
- FIG. 9 shows an embodiment according to FIG. 7 , in which the pressure is however reduced by active cooling by cooling ducts 14 . Solidified material thereby exits from the end of the discharge duct 2 .
Abstract
A device and a method for filtering viscous or highly viscous liquids, in particular plastics melts, includes use of an oscillating filter plate.
Description
- The invention relates to a method and an apparatus for filtering viscous or highly viscous liquids, in particular plastics melts, using a filter plate.
- To remove contaminants from viscous or highly viscous liquids, in particular plastics melts, the prior art generally uses filtration apparatuses which use various filter embodiments.
- Contaminants which frequently occur in viscous or highly viscous liquids, such as for example plastics melts, are for example organic or inorganic contaminants, such as metals, mineral substances and the like, or contaminants resulting from other polymers, foreign particles, excessively coarse added substances and additives and agglomerates thereof. Further problematic contaminants are for example degradation products of the viscous or highly viscous liquid, which arise in use, production or other proper or improper uses, for example exposure to excessive temperatures, or during production, for example in the case of plastics, by excessive or inadequate crosslinking, such as for example gels.
- The filters used in this respect are in particular sieve plates or indeed filter belts or “belt filters”.
- In any event, the openings in the corresponding filter must be smaller than the contaminants to be retained and separated from the viscous or highly viscous liquid.
- As a result of deposition of the contaminants on the filter belt or sieve plate, the degree of contamination of the respective filter unit used increases more or less quickly as a function of the degree of contamination of the viscous or highly viscous liquid and the throughput thereof through the filtration apparatus. In the worst case, this may result in as good as no liquid any longer being able to pass through the filter.
- As a function of the filter embodiment used, a sieve plate must therefore for example be replaced or back-flushed. Cleaning then proceeds as a function of the degree of contamination or pressure build-up or at fixed times.
- This generally means that material flow is not continuous, since the melt may be passed through other chambers during replacement or the back-flushing process, possibly resulting in pressure pulses and the like. Filtration conditions undergo change as a result of the pressure build-up which occurs until the filter is exchanged. Precisely in the case of highly contaminated materials with extensive, sheet-like contaminants, the filter may very rapidly become blocked, so resulting in very frequent exchange cycles interrupting material flow.
- For this reason, a filtration system with continuous cleaning of the filter is highly advantageous.
- In continuous systems, the filter is cleaned, for example, by rotating a plate provided with fine holes or a cylinder, or cleaning is performed constantly by a rotating scraper or a screw mounted in the material stream on the sieve surface. In the process, the contaminants are conveyed outwards through suitable transport ducts and pressure-reducing mechanisms.
- A disadvantage here is the mechanical contact between the cleaning apparatus and the sieve plate or the filter belt, which, in particular in the case of high levels of mineral or metallic contamination, leads to high levels of wear to the sieve plate or the filter belt. Moreover, in most systems relatively large dead volumes arise, with long material holding times, which may lead to melt degradation.
- When cleaning the filter plate, for example, using scrapers, screws and the like, melt does not flow through the cleaning zone and a “food mill effect” arises, i.e. comminution of the contaminants and thus passage of the contaminants through the filter plate.
- A filter apparatus is known, for example, from AT 404562 B for liquids containing contaminants, in which the filter is cleaned by a scraper element.
- A filter apparatus is known from
DE 10 2016 202 489 which comprises an inlet chamber, an outlet chamber and a filter system separating inlet chamber and outlet chamber, wherein the inflow direction of the liquid to be filtered is at an angle of between 10° and 90°, in particular between 30° and 70°, relative to the surface normal of the filter. This tangential inflow to the filter enables very small chamber volumes. - The object of the present invention is to provide a filter apparatus for filtering viscous or highly viscous liquids, in particular plastics melts, which allows continuous operation and additionally the avoidance of the disadvantages of the prior art, in particular wear to the filter plate.
- The present invention accordingly provides a filter system comprising a filter plate situated in a filter chamber, which is supported by a filter support plate, characterized in that either the filter plate is guided on the filter support plate by sliding elements in grooves or the filter support plate with the filter plate situated thereon is guided in the filter chamber by sliding elements and the filter plate or the filter plate together with the filter support plate is guided in an oscillating motion to clean the filter plate.
- The present invention also provides a method for filtering viscous or highly viscous liquids, in particular plastics melts, including the following method steps
-
- supplying the viscous or highly viscous liquid to a filter chamber, in which a filter plate is situated which is guided in the filter chamber at the bottom and/or sides by sliding elements and which is guided in an oscillating motion
- supplying the viscous or highly viscous liquid to the filter chamber through an inlet opening
- carrying away the liquid passing through the filter plate
- moving the filter plate to a cleaning chamber
- carrying away the contaminants present on the filter plate by way of the cleaning chamber using conveying devices or a back-flushing process.
- In this case, during the filter cleaning process no cleaning apparatus passes over the surface or relative to the surface of the filter plate, but rather the filter plate is moved by the motion on one side or symmetrically on each side to a cleaning chamber. A cleaning apparatus, for example a scraper, does not pass over the surface of the filter plate or relative thereto, but rather the filter plate is moved by the motion into one side or symmetrically on each side of the cleaning chamber. In this way, the cleaning process is uncoupled from the filtration process.
- One substantial advantage is that during cleaning of the filter plate melt continues to flow through the latter in the filter zone and the occurrence of the “food mill effect”, i.e. comminution of the contaminants and thus passage of the contaminants through the filter plate is thus virtually eliminated. In particular, gels present in the melt may be removed extremely effectively and are not forced through the filter plate during cleaning. The filter zone is that region in which the liquid to be filtered passes through the filter plate and the filter support plate.
- No filtration takes place in the cleaning zone.
- Since there is also no scraper resting constantly on the plate, wear from hard contaminants of the melt, such as mineral or metallic contaminants, may also be greatly reduced.
- According to the invention, the filter plate may be embodied as a solid sieve plate or indeed consist of a stack of one or more filter mats or sheets.
- The sieve plate may in this case take the form of a solid plate with holes, which are produced for example by drilling, electric discharge machining, water jet, lasers, electron beam, particle beams (for example protons), by etching or the like.
- In this case, depending on the embodiment, the filter plate is preferably at least twice as wide as the active filter area in the filter zone.
- The filter plate or the filter support plate is guided at the bottom and sides for example via sliding elements in grooves, wherein the sliding elements may consist of low-wear materials or bearing materials, such as for example copper, aluminium bronzes, sintered elements or the like. The melt itself may here also form a thin lubricant film.
- The filter plate may be supported in the filter chamber by a filter support plate, which likewise comprises openings for passage of the melt.
- The filter support plate is in any event embodied in such a way that it ensures an optimum compromise between permeability, i.e. low flow resistance, and optimum strength. The openings in the filter support plate may be round, polygonal, in the form of elongate holes and the like and arranged perpendicular or at an angle to the surface in order for example to allow better flow distribution. The cross-section and directions may also vary in the longitudinal profile of the openings.
- The filter support plate may moreover take the form of a plurality of layers, materials and combinations.
- Thus, for example, the surface may be embodied with a particularly friction-reducing soft or hard layer or texture in order for example to facilitate sliding of the filter element.
- A particularly firm, tension-resistant material may be arranged under the surface of the filter support plate. The filter support plate here consists for example of hardened steel, on the surface of which is applied a material with good sliding properties, such as for instance bronze.
- In one embodiment, the filter plate may be moved to and fro, i.e. oscillated, in the filter chamber over the stationary filter support plate during the filtration process. The stationary filter support plate then acts as a separator in the melt stream.
- In this case, the filter plate preferably takes the form of a solid plate, since it must be able directly to absorb the forces which arise as a result of the plate being pushed to and fro.
- In a further embodiment of the invention, the entire filter plate with the filter support plate arranged therebelow may oscillate, said filter support plate at the same time absorbing the force arising from the pressure difference in the melt stream.
- In this case, the filter plate may take the form of a thin plate, sheet or mat, since it does not have to absorb any thrust forces. The force which is needed to move the filter plate and the filter support plate necessary is in this case greater than in a case where only the filter plate is moved.
- A combination of these embodiments is, however, also possible, wherein for example a compact but thin filter plate is oscillated over a filter support plate. Suitable measures must then be taken to absorb the higher friction forces which arise as a result of the high melt pressure. This is achieved in particular by the sliding elements being of low-wear materials or bearing materials.
- Motion or oscillation of the filter plate or of the filter plate and the filter support plate may be brought about by an electrical, hydraulic, pneumatic or other mechanical drive.
- A cleaning chamber is arranged on one or both sides of the filter chamber.
- This cleaning chamber is arranged somewhat higher in the filter inflow direction than the filter plate itself, in order additionally to take up contaminants at the surface. The cleaning chamber is embodied by blocking elements which, alone or in combination additional cleaning elements, seal the cleaning chamber relative to the filter chamber.
- The blocking and/or cleaning elements may be moved mechanically, under the control of levers or links, by a reciprocating motion, by springs, by melt pressure, or independently electrically, mechano-pneumatically or hydraulically. The contact pressure of the blocking and/or cleaning elements may be varied as desired, depending on application.
- Scraper units may preferably be considered as cleaning elements. The scrapers themselves are mounted replaceably on a base unit. The scrapers may in this case consist of metals or alloys. Sandwich structures may however also be provided, which are in each case also provided with different surface coatings such as PVD or CVD, DLC or ceramic layers, or of plastics and combinations thereof. What is essential here is the combination of the materials of scraper and sieve, in order on the one hand to enable optimum cleaning and on the other hand to keep wear levels low.
- The scrapers are in this case embodied as wedges, blades, cutters, rollers, slats, a driven screw or as a combination of such embodiments. In one particular embodiment, a cleaning apparatus may also be incorporated; in this way, one or more scrapers are for example guided through a slotted plate during the backwards movement and the contaminants are scraped off as they are drawn through.
- Depending on contaminant, materials, filter material etc., with this system the contact pressure may be varied virtually at will so as to enable an optimum cleaning action with minimum filter wear.
- The filter plate is moved by at least one slider, which seals the cleaning chamber from the outside.
- In one particular embodiment, the filter plate may ultimately be embodied such that sealing is achieved by raising the filter plate to the height of the cleaning chamber itself.
- Furthermore, a plurality of sealing and/or cleaning elements may also be arranged in series.
- The plate is then moved into the cleaning chamber, the piston being moved to the side to open up the volume of the cleaning chamber. In this phase, the actual cleaning elements are not or only slightly in contact with the plate surface. Only once part, for example half, of the plate has been introduced into a cleaning chamber is the latter substantially sealed from the filter chamber by the blocking and/or cleaning elements.
- Then an outflow duct, which may comprise corresponding elements such as active or passive screws, helices or labyrinth-type structures, is opened by means of a valve or by the geometry of the filter plate. Moreover, the outflow duct may be separated thermally from the filter and in this way the viscosity of the outflowing material may be purposefully influenced by dedicated heating or cooling systems.
- The valves may be embodied as pistons, ball valves, slide valves, or linear or rotating, and may be mechanically, pneumatically or hydraulically actuatable.
- In one specific embodiment, the blocking and cleaning sliders may take the form of valves.
- A profile channel may here be mounted along the slider, for example, via which the contaminants are passed to a duct incorporated into the slider. In the cleaning cycle, this slide valve is in contact with the filter. In precisely this position the duct incorporated into the slider lies in the same plane as a bore in the slider support plate and thus opens up a duct to the outside directly or by way of above-stated pressure-reducing elements, via which duct the contaminants are passed to the outside.
- In this embodiment, it is possible to dispense with further valve units.
- The filter plate is then moved in the opposite direction. The slider or the end of the filter plate then reduces the volume of the cleaning chamber and at the same time the surface of the filter plate is cleaned by the blocking wedges or additional scraper profiles, rotating screws, rollers and the like. The contaminants are discharged into the cleaning chamber together with the remainder of the melt.
- To simplify discharge over the width, the sliders or cleaning elements are arranged for example obliquely or also in the shape of a V. In the case of the V-shaped arrangement of the cleaning elements, two ducts are provided.
- In a further embodiment, two cleaning chambers may be provided.
- In this case, the filter is cleaned on one side only to a good half or preferably a good ⅓ of the total length of the filter in the first chamber and at the same time is introduced on the opposite side into the second symmetrically arranged chamber.
- As a result of the specific construction, it is also possible to back-flush the filter area with a stream of material from the opposite side when cleaning, i.e. before or during pushing back into the active position.
- For this purpose, material is forced actively by an actively driven valve or by corresponding overflow ducts from the clean side towards the now almost pressureless opposite side in the cleaning chamber.
- As an alternative, however, a volume of material with filtered material may also be provided on the bottom of the cleaning chamber in such a way as to enable a stream of cleaned material at the bottom during movement of the filter into the cleaning chamber. To this end, overflow ducts are provided which are open in the end position of the support or filter plate. During the cleaning motion, these overflow ducts are closed and the clean material is forced from underneath through the filter support plate and the filter plate.
- Since on insertion of the filter plate into the cleaning chamber, melt may also be filtered into the filter chamber and through the filter plate, such backflushing may also take place to a lesser degree without the use of overflow ducts.
- Naturally, specific backflow valves may also be inserted in the discharge ducts. It is also possible, after the cleaning process, to modify the properties of the melt, for example, by applying active substances, additives, catalysts etc. via suitable metering valves and apparatuses or via the scraper elements, past which the filter plate moves in the opposite direction in order to bring it back into the filtration position.
- According to a further embodiment, two filter chambers are each connected to a common melt duct by means of a switchable valve, in such a way that, when the valve is in the one state, the melt runs through the first filter chamber and, when the switchable valve is in the other state, the melt runs through the second filter chamber.
- The valve is configured such that parallel operation is possible. Three or more filter chambers may also be connected in parallel by way of such valves, such that at least one of the filters always ensures melt flow.
- In a further embodiment, two or more filter chambers may be arranged one above the other or next to one another in series, such that the outflow of the preceding one is connected to the inflow of the subsequent one and the melt passes successively through the two or more belt filters.
- Discharge of the contaminants in the form of the filter cake may proceed sideways in the direction of the sieve motion or at 90° thereto or upwards. What is important here is that in the process the contaminants undergo a pressure reduction to atmospheric pressure.
- In the simplest case, this is achieved by a helix or conveying screw. To be able actively to convey the contaminants outwards downstream of the chamber valve, a dedicated helix or conveying screw may convey the material outwards on each side or, if the discharge ducts converge, this may proceed with a common helix or conveying screw. No further excessive degradation of the melt must take place in the process, so as not to generate deposits in the discharge region.
- In a further embodiment, the material may however be actively cooled during discharge, such that only high-viscosity or even solidified contaminants arrive outside. To this end, a cold duct decoupled thermally from the heated system is provided in the filter.
-
FIGS. 1 to 9 show embodiments according to the invention. In particular: -
FIGS. 1a-1c show a method for cleaning the filter; -
FIGS. 2a-2c show a method for cleaning the filter with free back-flushing; -
FIGS. 3a-3c show a filtration method with forced back-flushing; -
FIG. 4 shows an embodiment of the filter; -
FIG. 5 shows an embodiment of the filter in which only the filter plate is oscillated; -
FIG. 6 shows an embodiment for conveying away the filter cake; -
FIG. 7 shows an embodiment in which the filter cake is conveyed away in a controlled manner by a conveying screw; -
FIG. 8 shows cooling ducts in the cleaning chamber for conveying away the filter cake; and -
FIG. 9 shows an embodiment according toFIG. 7 , in which the pressure is reduced by active cooling by cooling ducts. - In the description below, the following reference numbers are used:
- 1 the filter chamber
- 2 the filter plate
- 3 the filter support plate
- 4 the contaminants (filter cake)
- 5, 5 a a cleaning chamber
- 6, 6 a a blocking slider with integral valve
- 7 the discharge duct in the cleaning chamber
- 8 plain bearings
- 9 a conveying screw for conveying away the filter cake
- 10 the viscous or highly viscous liquid to be filtered, for example the plastics melt to be filtered
- 11 the filtrate of the viscous or highly viscous liquid
- 12 a blocking element
- 13 an insulating layer
- 14 heating or cooling ducts
- 15 the melt chamber for back-flushing
- 15 a the back-flushed melt
- 16 the slider for moving the filter or the filter support plate
- 17 the melt inlet
- 18 the melt outlet
- 19 a shut-off element for forced back-flushing
- 20 solidified contaminant material
- 21 the cleaning zone
- 22 the filter zone.
-
FIGS. 1a-1c show a method for cleaning the filter in which the filter is cleaned without back-flushing. - The device consists in this respect of a
filter chamber 1 and afilter plate 2, which is supported by afilter support plate 3. - As shown in
FIG. 1a , the contaminants settle on thefilter plate 2 asfilter cake 4 during the course of the process of filtering a viscous or highlyviscous liquid 10. - To clean the
filter plate 2 of thefilter cake 4, thevalve 6, which in this case takes the form of a piston, is actuated and thefilter cake 4 is passed into thecleaning chamber 5 and removed from the cleaning chamber through theduct 7. Removal of thefilter cake 4 proceeds by displacing thefilter plate 2 optionally together with thefilter support plate 3 in the direction of the arrows, wherein thefilter plate 2 is transported to asecond cleaning chamber 5 a and the process for complete cleaning of the filter plate is carried out. -
FIGS. 2a-2c show a method for cleaning the filter with free back-flushing. - Here, the pressure difference up- and downstream of the
filter plate 2 which arises during cleaning of the filter ensures that some of thefiltrate 11 from the melt chamber is forced back for back-flushing 15 through thefilter support plate 3 and thefilter plate 2 in the back-flushingzone 21 below the filter cake 4 (FIG. 2b ). Thefilter cake 4 is lifted up by the back-flushedmelt 15 a and in this way forced more readily into theduct 7 of thecleaning chamber 5. - Removal of the
filter cake 4 proceeds by displacing thefilter plate 2 optionally together with thefilter support plate 3 in the direction of the arrows, wherein thefilter plate 2 is transported to asecond cleaning chamber 5 a and the process for further cleaning of the filter plate is carried out. -
FIGS. 3a-3c show a filtration method with forced back-flushing. Here the back-flushing process is initiated by sealing the back-flushingzone 15 by the slider motion. The filter system here comprises an additional shut-offelement 19. The material is forced through the filter from below with elevated pressure and the filter plate cleaning process is carried out as in the procedure shown inFIG. 2 . -
FIG. 4 shows an embodiment of the filter, in whichfilter plate 2 and filtersupport plate 3 oscillate together, i.e. are pushed to and fro. Thefilter support plate 3 is here mounted in thefilter chamber 1 onplain bearings 8. -
FIG. 5 shows an embodiment of the filter in which only thefilter plate 2 is oscillated. In this case, thefilter plate 2 is mounted onplain bearings 8 which are situated on thefilter support plate 3. -
FIG. 6 shows an embodiment for conveying away thefilter cake 4 out of the cleaning chamber. In this case, induct 7 modification of the cross-section reduces the pressure from a pressure level P1 to a pressure level P0, thefilter cake 4 thereby being conveyed out of the duct - In
FIG. 7 ,filter cake 4 is conveyed away in a controlled manner by means of a conveyingscrew 9. - In
FIG. 8 ,cooling ducts 14 are provided in the cleaning chamber for conveying away thefilter cake 4, such that the pressure in the cleaning chamber is reduced by cooling. The insulatinglayer 13 serves to decouple the temperature of thedischarge duct 7, and thus the temperature of the material to be discharged may be reduced and the viscosity increased by a lower temperature than in the filter. -
FIG. 9 shows an embodiment according toFIG. 7 , in which the pressure is however reduced by active cooling by coolingducts 14. Solidified material thereby exits from the end of thedischarge duct 2.
Claims (20)
1. A filter system comprising:
a filter chamber which defines an active filter area in a filter zone;
at least one cleaning chamber connected to the filter chamber;
a filter plate arranged in the filter chamber, the filter plate being at least twice as wide as the active filter area; and
a filter support plate arranged in the filter chamber, the filter plate being supported by the filter support plate,
wherein the filter plate is movable to the at least one cleaning chamber to clean the filter plate,
wherein either (i) the filter plate is guided on the filter support plate, by sliding elements in grooves, in an oscillating motion relative to the filter support plate to clean the filter plate, or (ii) the filter support plate is guided in the filter chamber by sliding elements such that the filter plate together with the filter support plate is guided in an oscillating motion to clean the filter plate.
2. (canceled)
3. The filter system according to claim 1 , wherein the at least one cleaning chamber is sealed relative to the filter chamber by one or more blocking elements.
4. The filter system according to claim 1 , further comprising a cleaning apparatus in the form of a scraper unit.
5. The filter system according to claim 1 , wherein the filter plate takes the form of a plate, sheet or mat.
6. The filter system according to claim 1 , wherein a conveying screw is provided in the at least one cleaning chamber for discharging a filter cake.
7. A method for filtering viscous or highly viscous liquids, comprising:
supplying the viscous or highly viscous liquid to a filter chamber which defines an active filter area in a filter zone, the filter chamber having a filter plate supported by a filter support plate, the filter plate being at least twice as wide as the active filter area, wherein either (i) the filter plate is guided on the filter support plate, by sliding elements in grooves, in an oscillating motion relative to the filter support plate, or (ii) the filter support plate is guided in the filter chamber at the bottom and/or sides by sliding elements such that the filter plate together with the filter support plate is guided in an oscillating motion;
supplying the viscous or highly viscous liquid to the filter chamber through an inlet opening;
carrying away the liquid passing through the filter plate;
moving the filter plate to a cleaning chamber; and
carrying away contaminants present on the filter plate by way of the cleaning chamber.
8. The method according to claim 7 , wherein the carrying away of the contaminants present on the filter plate is performed by a back-flushing process initiated by a pressure difference up- and downstream of the filter plate.
9. The method according to claim 7 , wherein the carrying away of the contaminants present on the filter plate is performed by a back-flushing process initiated by sealing a back-flushing zone.
10. The method according to claim 7 , wherein the carrying away of the contaminants present on the filter plate is performed by using conveying devices.
11. The method according to claim 7 , wherein during cleaning of the filter plate, the viscous or highly viscous liquid continues to flow through the filter plate in the filter zone.
12. The filter system according to claim 3 , wherein the one or more blocking elements may be moved mechanically, under the control of levers or links, by a reciprocating motion, by springs, by melt pressure, or independently electrically, mechano-pneumatically or hydraulically.
13. The filter system according to claim 3 , wherein the one or more blocking elements are formed with an integral valve, by which a filter cake is removable from the cleaning chamber.
14. The filter system according to claim 1 , further comprising first and second cleaning chambers arranged on opposite sides of the filter zone, respectively.
15. The filter system according to claim 1 , further comprising first and second blocking sliders arranged on opposite sides of the filter zone, respectively.
16. The filter system according to claim 1 , further comprising first and second slider elements arranged on opposite sides of the filter support plate, respectively.
17. The filter system according to claim 14 , wherein the filter plate and the filter support plate are arranged such that, due to either the oscillating motion of the filter plate relative to the filter support plate or the oscillating motion of the filter plate together with the filter support plate, one portion of the filter plate can be filtering by flowing unfiltered liquid from an unfiltered chamber through the active filter area to a filtered chamber, while another portion of the filter plate is being cleaned in one of the first and second cleaning chambers.
18. The filtration system according to claim 1 , wherein the filter plate is selected from the group consisting of a belt, a sheet, a plate or a mat.
19. The filtration system according to claim 15 , wherein each of the blocking sliders includes an integral valve.
20. The filtration system according to claim 19 , further comprising first and second cleaning chambers arranged on opposite sides of the filter zone, respectively, each cleaning chamber having a discharge duct,
wherein each of the blocking sliders defines a fluid passage capable of permitting any back-flushed liquid to flow to the discharge duct of one of the cleaning chambers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/174,914 US20210162324A1 (en) | 2016-10-17 | 2021-02-12 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16002224.0 | 2016-10-17 | ||
EP16002224.0A EP3308940A1 (en) | 2016-10-17 | 2016-10-17 | Filtering system for viscose or highly viscose liquids, in particular molten plastic and method for filtering viscose or highly-viscose liquids |
US15/728,865 US10933357B2 (en) | 2016-10-17 | 2017-10-10 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
US17/174,914 US20210162324A1 (en) | 2016-10-17 | 2021-02-12 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/728,865 Continuation US10933357B2 (en) | 2016-10-17 | 2017-10-10 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
Publications (1)
Publication Number | Publication Date |
---|---|
US20210162324A1 true US20210162324A1 (en) | 2021-06-03 |
Family
ID=57144711
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/728,865 Active 2038-10-15 US10933357B2 (en) | 2016-10-17 | 2017-10-10 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
US17/174,914 Pending US20210162324A1 (en) | 2016-10-17 | 2021-02-12 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/728,865 Active 2038-10-15 US10933357B2 (en) | 2016-10-17 | 2017-10-10 | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
Country Status (2)
Country | Link |
---|---|
US (2) | US10933357B2 (en) |
EP (1) | EP3308940A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11260570B2 (en) * | 2018-05-07 | 2022-03-01 | PSI-Polymer Systems, Inc. | Filtration apparatuses and screen changer devices for polymer processing and related methods |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3259109B1 (en) * | 2015-02-19 | 2022-05-18 | Next Generation Analytics GmbH | Filter device and filter method |
EP3088157B1 (en) * | 2015-04-30 | 2021-05-12 | Fimic S.r.l. | Filter for plastic material |
EP3308940A1 (en) * | 2016-10-17 | 2018-04-18 | Next Generation Analytics GmbH | Filtering system for viscose or highly viscose liquids, in particular molten plastic and method for filtering viscose or highly-viscose liquids |
EP3827963A1 (en) * | 2019-11-28 | 2021-06-02 | Nordson Corporation | Device for filtering a fluid, especially a plastic melt with impurities, and valve arrangement for such a fluid |
CN112827241B (en) * | 2021-01-06 | 2022-07-22 | 惠州辉煌涂料有限公司 | Preparation method of water-based paint |
CN112999737A (en) * | 2021-03-09 | 2021-06-22 | 中国十七冶集团有限公司 | Operation method of drainage extraction pre-filtering structure for water supply and drainage engineering |
CN117654146A (en) * | 2024-01-31 | 2024-03-08 | 湖南中创空天新材料股份有限公司 | Filtering device and filtering method for casting production |
Citations (122)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US937676A (en) * | 1909-06-24 | 1909-10-19 | William S Elliott | Strainer. |
US1195576A (en) * | 1916-08-22 | garrahan | ||
US2513795A (en) * | 1946-08-30 | 1950-07-04 | Western Electric Co | Strainer |
US2661497A (en) * | 1951-04-03 | 1953-12-08 | Celanese Corp | Extrusion apparatus |
US2763308A (en) * | 1952-06-11 | 1956-09-18 | Nat Plastic Products Company | Screen mounting for conduits and tubes for conveying fluids and for extrusion machines |
US2786504A (en) * | 1953-10-20 | 1957-03-26 | Nat Plastic Products Company | Screen changing apparatus for conduits and tubes for conveying fluids and for extrusion machines |
US2838084A (en) * | 1956-08-08 | 1958-06-10 | Nat Plastic Products Company | Screen changing method for conduits and tubes for conveying fluids and for extrusionmachines |
US3007199A (en) * | 1959-01-20 | 1961-11-07 | Albert Andy | Extruding head filter |
US3145746A (en) * | 1963-02-25 | 1964-08-25 | Nat Plastic Products Co Inc | Screen changing apparatus |
US3471017A (en) * | 1967-02-21 | 1969-10-07 | Peter Gabor Kalman | Filtering process and apparatus |
US3583453A (en) * | 1968-03-13 | 1971-06-08 | Messrs Windmoller & Holscher | Screen-changing apparatus for extruders |
US3653419A (en) * | 1969-04-16 | 1972-04-04 | Berstorff Gmbh Masch Hermann | Extruder screen plate change-over mechanism |
US3675934A (en) * | 1970-06-01 | 1972-07-11 | Eugene E Heston | Screen changer mounting |
US3743101A (en) * | 1972-04-18 | 1973-07-03 | L Schmidt | Screen changer |
US3799351A (en) * | 1972-12-13 | 1974-03-26 | F Tewes | Quick change filtering machine |
US3804758A (en) * | 1972-03-29 | 1974-04-16 | Cosham Eng Design Ltd | Screen changer |
US3817377A (en) * | 1970-07-17 | 1974-06-18 | Poly Converters Ltd | Method and apparatus for filtering flowable material |
US3855126A (en) * | 1972-08-14 | 1974-12-17 | G Smith | Continuous incremental feed filtration process and apparatus |
US3856680A (en) * | 1973-10-15 | 1974-12-24 | Mobil Oil Corp | Automatic screen changer for extruding processes |
US3856277A (en) * | 1973-09-28 | 1974-12-24 | Gloucester Eng Co Inc | Screen assembly for processing plastic |
US3900399A (en) * | 1972-11-18 | 1975-08-19 | Joachim Kreyenborg | Filter apparatus for extrusion presses |
US3940335A (en) * | 1972-08-29 | 1976-02-24 | Peter Gabor Kalman | Filtering process and apparatus |
US3962092A (en) * | 1975-01-10 | 1976-06-08 | The Dow Chemical Company | Screen changer |
US3971721A (en) * | 1974-12-31 | 1976-07-27 | Fogarty Jr John E | Continuous filter |
US3983038A (en) * | 1975-11-03 | 1976-09-28 | Heston Eugene E | Self-purging screen changer and strainer plate |
US4021346A (en) * | 1975-03-17 | 1977-05-03 | Berthiaume Robert L | Filter for plastic extruding machine |
US4025434A (en) * | 1975-10-06 | 1977-05-24 | Bolton-Emerson, Inc. | Screen changer with pre-fill screen blocks |
US4059525A (en) * | 1976-06-28 | 1977-11-22 | Leonard L | Slide filters |
US4082487A (en) * | 1977-03-28 | 1978-04-04 | Western Electric Company, Inc. | Apparatus for changing screen devices |
US4159953A (en) * | 1978-06-05 | 1979-07-03 | The Berlyn Corporation | Slide plate filters for thermoplastic and similar materials |
US4167384A (en) * | 1977-11-28 | 1979-09-11 | The Japan Steel Works, Ltd. | Filter screen exchanging apparatus for plastic extruder |
US4237014A (en) * | 1979-03-12 | 1980-12-02 | Beringer Co., Inc. | Flowable material passage with interposable slide member |
US4238877A (en) * | 1978-12-22 | 1980-12-16 | Western Electric Company, Inc. | Fabrication of screen devices |
US4257901A (en) * | 1979-08-13 | 1981-03-24 | Western Electric Co., Inc. | Cleanable filter and method of cleaning same |
US4265756A (en) * | 1979-01-29 | 1981-05-05 | Schiesser Ag | Change device for sieves for filtering plastic materials |
US4268391A (en) * | 1979-11-28 | 1981-05-19 | The Berlyn Corporation | Leak proof filter plate system for slide plate filters |
US4359387A (en) * | 1979-03-12 | 1982-11-16 | Beringer Co., Inc. | Flowable material passage with interposable slide member |
US4395212A (en) * | 1980-04-03 | 1983-07-26 | Werner & Pfleiderer | Screen-change device for extruders |
US4416605A (en) * | 1981-05-07 | 1983-11-22 | Kabushiki Kaisha Kobe Seiko Sho | Screen/diverter changing mechanism for extruders |
US4468322A (en) * | 1983-01-17 | 1984-08-28 | Thermoplas Machinery, Inc. | Slide plate screen changer |
US4507072A (en) * | 1982-10-25 | 1985-03-26 | E. I. Dupont De Nemours And Company | Diverting plate |
US4701118A (en) * | 1985-07-03 | 1987-10-20 | Kreyenborg Verwaltungen Und Beteiligungen Kg | Apparatus for filtering plasticized materials in extruders |
US4725215A (en) * | 1986-02-26 | 1988-02-16 | Kreyenborg Verwaltungen Und Beteiligungen Kg | Extruder with exchangeable filter for foamed plastic material |
US4728279A (en) * | 1985-10-03 | 1988-03-01 | Hermann Berstorff Maschinenbau Gmbh | Extrusion head including a sealing mechanism for a filter changing device |
US4752386A (en) * | 1986-06-06 | 1988-06-21 | Erema Engineering-Recycling | Filter apparatus having filter elements shiftable between filtering and backwashing positions |
US4781563A (en) * | 1986-07-16 | 1988-11-01 | Hermann Berstorff Maschinenbau Gmbh | Filter changing mechanism including means for discharging residues of rubber or thermoplastics material from extrusion presses |
US4814186A (en) * | 1988-02-29 | 1989-03-21 | Beringer Co., Inc. | Polymer filtration apparatus |
US4842750A (en) * | 1985-10-04 | 1989-06-27 | Lucian Britchi | Apparatus for cleaning viscous materials |
US4849113A (en) * | 1988-05-23 | 1989-07-18 | Hills William H | Continuous polymer filter |
US4880374A (en) * | 1987-05-20 | 1989-11-14 | Fuji Photo Film Co., Ltd. | Filter exchange device for an extrusion molding machine |
US5032267A (en) * | 1987-10-29 | 1991-07-16 | Indupack Ag | Apparatus for filtering a heat-softened stream of plastic material |
US5061170A (en) * | 1989-12-08 | 1991-10-29 | Exxon Chemical Patents Inc. | Apparatus for delivering molten polymer to an extrusion |
US5417866A (en) * | 1993-07-02 | 1995-05-23 | Extek, Inc. | Continuous flow polymer filtration apparatus and process |
US5417856A (en) * | 1991-03-25 | 1995-05-23 | Bacher; Helmut | Filter apparatus for fluids to be cleaned |
US5464537A (en) * | 1992-12-23 | 1995-11-07 | Kopernicky; Jaroslav J. | Filtering debris from molten plastic |
US5507498A (en) * | 1993-10-13 | 1996-04-16 | Synergy Extrusion Technologies, Inc. | Sealing device for polymer filtration apparatus |
US5525052A (en) * | 1993-02-26 | 1996-06-11 | Emil Lihotzky Maschinenfabrik | Extrusion machine |
US5556592A (en) * | 1994-08-15 | 1996-09-17 | Hitchings; Jay | Filter indexing apparatus for filtering molten metal |
US5578207A (en) * | 1994-05-03 | 1996-11-26 | Firma Kreyenborg Verwaltungen Und Beteiligungen Kg | Filter device for extruders having a screen plunger with longitudinally arranged candle filters |
US5578206A (en) * | 1993-12-27 | 1996-11-26 | The Japan Steel Works, Ltd. | Screen pack replacing apparatus |
US5603828A (en) * | 1994-09-20 | 1997-02-18 | The Japan Steel Works, Ltd. | Filter screen changer for resin extruder |
US5605626A (en) * | 1994-06-01 | 1997-02-25 | Gneuss Kunststofftechnik Gmbh | Plate sieve changer |
US5607583A (en) * | 1995-07-03 | 1997-03-04 | Kreyenborg, Inc. | Filter device for extruders and injection-molding machines |
US5632902A (en) * | 1990-11-16 | 1997-05-27 | Kalman; Peter G. | Filtering method and apparatus including valves with valve plugs of a cooled fluid substance |
US5672269A (en) * | 1996-02-29 | 1997-09-30 | Illinois Tool Works Inc. | Filter/pressure relief assembly for an adhesive supply unit |
US5756129A (en) * | 1994-07-01 | 1998-05-26 | Kabushiki Kaisha Kobe Seiko Sho | Filter member and screen changer for use in resin extruder |
US5770067A (en) * | 1996-03-29 | 1998-06-23 | Wil-Man Polymer Filtration Gmbh | Device for filtering a fluid |
US5783223A (en) * | 1996-08-27 | 1998-07-21 | National Polymers Inc. | Plastic injection molding machine with continuous removal of particulate contaminants |
US5840197A (en) * | 1995-04-19 | 1998-11-24 | The Japan Steel Works, Ltd. | Method for filtering a screen changer and a screen changer |
US5922194A (en) * | 1995-05-13 | 1999-07-13 | Firma Kreyenborg Verwaltungen Und Beteilgungen Gmbh & Co. Kg | Filter changing device for plastics processing plants |
US6010625A (en) * | 1997-10-16 | 2000-01-04 | Beringer Llc | Screen changer with controlled gap |
US6196820B1 (en) * | 1998-03-11 | 2001-03-06 | Mannesmann Ag | Device for filtering plastics in injection molding machines |
US6238558B1 (en) * | 2000-06-06 | 2001-05-29 | Beringer Llc | Filter changer with bimodal sealing means |
US6260852B1 (en) * | 1997-01-27 | 2001-07-17 | Paul Troester Maschinenfabrik | Sealing device for an annular gap between two sealing surfaces of machine parts |
US6290846B1 (en) * | 1997-11-27 | 2001-09-18 | Wil-Man Polymer-Filtration Gmbh | Device for filtering molten plastic |
US6342156B1 (en) * | 1999-09-17 | 2002-01-29 | Continental Pet Technologies, Inc. | Multi-segment continuous filtration system |
US6375013B1 (en) * | 1997-01-14 | 2002-04-23 | Josef Gail | Device for cleaning viscous material |
US6422852B1 (en) * | 1998-04-30 | 2002-07-23 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg | Filter device for extruders and injection moulding machines |
US20020158004A1 (en) * | 2001-04-02 | 2002-10-31 | Peter Emhardt | Device for filtering a liquid, particularly for filtering a polymer plastic melt |
US6500336B1 (en) * | 1997-12-31 | 2002-12-31 | Gneuss Kunststofftechnik Gmbh | Polymer melt filtering device with changing filter packets |
US6533934B1 (en) * | 1991-04-23 | 2003-03-18 | Josef Trendelkamp | Filter-replacement cassette |
US20040191123A1 (en) * | 2001-10-15 | 2004-09-30 | Heinrich Collin | Apparatus for testing the purity of plastic melts |
US20040200784A1 (en) * | 2003-04-10 | 2004-10-14 | Psi-Polymer Systems Inc. | Filtration apparatus for polymer processing and method |
US6811685B2 (en) * | 2002-09-18 | 2004-11-02 | Exxonmobil Research And Engineering Company | Fouling mitigation device with movable screen |
US20050016914A1 (en) * | 2002-09-17 | 2005-01-27 | Robert Middler | Device for filtering a fluid especially for plastic-processing installations |
US20050202114A1 (en) * | 2002-07-27 | 2005-09-15 | Berstorff Gmbh | Granulating device |
US20060163145A1 (en) * | 2002-10-28 | 2006-07-27 | Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. | Backflushable filter device for molten material and distribution unit for a filter device of this type |
US7124895B2 (en) * | 2002-06-29 | 2006-10-24 | Ettlinger Kunststoffmaschinen Gmbh | Device for continuous filtration of material blends |
US20070068867A1 (en) * | 2003-12-20 | 2007-03-29 | Roderich Ettlinger | Device for continuously filtering material mixtures |
US20080197061A1 (en) * | 2006-01-24 | 2008-08-21 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co., Kg | Device For Filtering A Liquefied Synthetic Material |
US20080217255A1 (en) * | 2004-08-19 | 2008-09-11 | Harald Pohl | Methods for Filtering a Fluid and an Apparatus and Filter Apparatus for Performing Said Method |
US20080283460A1 (en) * | 2006-08-30 | 2008-11-20 | Kreyenborg Verwaltungen Und Beteligungen Gmbh & Co., Kg | Device for Filtering a Fluid, Particularly for Plastic Processing Plants |
US20100006492A1 (en) * | 2006-09-13 | 2010-01-14 | Helmuth Schulz | Apparatus for the continuous filtering of impurities from a flowable compound |
US20110017681A1 (en) * | 2009-05-26 | 2011-01-27 | Bibey Joshua A | Filtration apparatus for filtering a fluid and methods of using the same |
US20110291319A1 (en) * | 2009-11-30 | 2011-12-01 | James Frederick Avery | Methods of Extruding a Honeycomb Body |
US8356625B2 (en) * | 2006-10-24 | 2013-01-22 | Gneuss Kunststofftechnik Gmbh | Device for the controlled guidance of a polymer melt |
US20130020247A1 (en) * | 2011-07-21 | 2013-01-24 | Saemann Hans-Joachim | Filter unit for an extruder system and filter arrangement and associated sieve changing device for an extruder system with a filter unit of this type |
US20130087975A1 (en) * | 2011-10-06 | 2013-04-11 | Kolcor Technologies LLC | Sealing Device In A Polymer Filtration Device |
US20130126410A1 (en) * | 2010-09-08 | 2013-05-23 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Screen unit and screen changer equipped with same |
US20130292316A1 (en) * | 2010-10-25 | 2013-11-07 | Maag Pump Systems Gmbh | Device for filtering a plastic melt |
US20140197092A1 (en) * | 2011-06-01 | 2014-07-17 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg | Filtering device for highly viscous fluids |
US8851332B2 (en) * | 2012-05-18 | 2014-10-07 | Jeff L. Mercer | Adhesive filtration system |
US8876517B2 (en) * | 2012-09-28 | 2014-11-04 | Nordson Corporation | Filtration apparatus with a sealing device |
US20140353261A1 (en) * | 2013-05-28 | 2014-12-04 | Parkinson Machinery & Manufacturing | Kcr screen changer |
US20150014257A1 (en) * | 2012-03-26 | 2015-01-15 | Parkinson Machinery & Manufacturing | Kch hybrid screen changers |
US20150014238A1 (en) * | 2012-03-30 | 2015-01-15 | Maag Pump Systems Gmbh | Device for filtering a thermoplastic melt |
US20150048016A1 (en) * | 2012-01-26 | 2015-02-19 | Nordson Holdings S.a.r.l. & Co. KG | Filtering device for the large-area filtration of fluids |
US20160001485A1 (en) * | 2014-07-01 | 2016-01-07 | Sino-Alloy Machinery Inc. | Extruder filter replacement and backwash structure |
US9855699B2 (en) * | 2010-06-01 | 2018-01-02 | Nordson Holdings S.a.r.l. & Co. KG | Filtering device for highly viscous media |
US20180050481A1 (en) * | 2015-03-09 | 2018-02-22 | Dr. Collin Gmbh | Device and method for testing materials |
US20180104625A1 (en) * | 2016-10-17 | 2018-04-19 | Next Generation Analytics Gmbh | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
US20180117504A1 (en) * | 2016-10-31 | 2018-05-03 | Westlake Longview Corporation | Candle Filter Support and Plate Assembly for Polymer Melts |
US20180345561A1 (en) * | 2016-11-21 | 2018-12-06 | PSI-Polymer Systems, Inc. | Extrusion die systems, die changers, and related methods |
US20190091916A1 (en) * | 2016-03-21 | 2019-03-28 | C M Produzione S.R.L. | Filtration device and filtration method for polymer extrusion |
US10307953B2 (en) * | 2013-04-12 | 2019-06-04 | Alfatech S.R.L. | Automatic screen changer device |
US20190337215A1 (en) * | 2018-05-07 | 2019-11-07 | PSI-Polymer Systems, Inc | Filtration apparatuses and screen changer devices for polymer processing and related methods |
US20200262125A1 (en) * | 2019-02-08 | 2020-08-20 | PSI-Polymer Systems, Inc. | Modular fluid processing apparatuses, modular components and related methods |
US20220097274A1 (en) * | 2019-01-08 | 2022-03-31 | Chtc Bio-Based Material Engineering & Technology(Ningbo) Co., Ltd. | Method and device for directly preparing foamed polylactic acid (pla) product from pla melt |
US20220118383A1 (en) * | 2020-10-15 | 2022-04-21 | Bd Plast Filtering Systems S.R.L. | Filter device for filtering extruded polymers and cleaning method |
US20220212129A1 (en) * | 2019-05-15 | 2022-07-07 | Nordson Corporation | Fluid Filtering System With Backflush Valve And Methods Of Operating The Same |
US20230264407A1 (en) * | 2022-02-24 | 2023-08-24 | Coperion Gmbh | Filter unit for an extruder assembly, filter arrangement and corresponding filter changing device and method for producing such a filter unit |
US20230356118A1 (en) * | 2019-11-28 | 2023-11-09 | Nordson Corporation | Apparatus for filtering a fluid, in particular a plastic melt having impurities, and a valve arrangement for such a fluid |
Family Cites Families (67)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL132958C (en) * | 1945-04-07 | 1900-01-01 | ||
US2822197A (en) * | 1954-11-02 | 1958-02-04 | Harley M Champ | Bearing seal with a pressure relief valve |
US3059276A (en) * | 1960-12-05 | 1962-10-23 | Sterling Extruder Corp | Extrusion apparatus |
US3146494A (en) * | 1961-11-13 | 1964-09-01 | Nat Rubber Machinery Co | Extruder with reverse flow flushed breaker plate assembly |
US3243849A (en) * | 1964-05-19 | 1966-04-05 | Du Pont | Screen changing |
GB1285702A (en) * | 1968-09-03 | 1972-08-16 | Peter Gabor Kalman | Filtering apparatus |
FR2082306A5 (en) * | 1970-03-10 | 1971-12-10 | Aquitaine Total Organico | |
US3856674A (en) * | 1972-04-19 | 1974-12-24 | P Kalman | Filtering process and apparatus |
US3797665A (en) * | 1972-11-20 | 1974-03-19 | Berlyn Corp | Screen changer |
IT1017448B (en) * | 1973-08-02 | 1977-07-20 | Scheer & Cie C F | POSITIVE FOR THE FILTRATION OF MOLTEN PLASTIC MATERIAL AS WELL AS FOR THE EXTRUSION OF PLASTIC CORDS |
JPS5196857A (en) * | 1975-02-20 | 1976-08-25 | Oshidashikino jidoromokokansochi | |
DE2836847A1 (en) * | 1978-08-23 | 1980-03-06 | Bayer Ag | LOW-VOLUME MULTI-WAVE SCREW MACHINE OUTLET DEVICE WITH SCREEN EXCHANGE DEVICE |
DE2947685A1 (en) * | 1979-11-27 | 1981-07-23 | Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover | FILTER DEVICE FOR SCREW EXTRUDERS |
DE3043217C2 (en) * | 1980-11-15 | 1982-07-15 | Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover | Screen or die changing device for screw extruders |
DE3309505C1 (en) * | 1983-03-17 | 1984-06-14 | Werner & Pfleiderer, 7000 Stuttgart | Cassette filters for molten plastics |
US4511472A (en) * | 1983-03-30 | 1985-04-16 | Beringer Co., Inc. | Apparatus for continuous polymer filtration |
SU1110651A1 (en) * | 1983-05-24 | 1984-08-30 | Всесоюзный Научно-Исследовательский Институт Резинотехнического Машиностроения | Mixture filtering device for screw-type machine |
US4588502A (en) * | 1983-12-06 | 1986-05-13 | Detlef Gneuss | Sieve device for cleaning molten plastics |
DE3419822C2 (en) * | 1984-05-26 | 1986-04-03 | Werner & Pfleiderer, 7000 Stuttgart | Filter device for screw extruders |
GB2176414B (en) * | 1985-06-13 | 1989-07-05 | Peter Gabor Kalman | Filtering processes and apparatus |
US4888110A (en) * | 1987-03-16 | 1989-12-19 | Key Filters, Inc. | Filtering device for thermoplastic material |
US4710288A (en) * | 1987-04-17 | 1987-12-01 | Hubert Patrovsky | Filtration system |
DE8716626U1 (en) * | 1987-12-17 | 1988-02-11 | Gneuss Kunststofftechnik Gmbh, 4970 Bad Oeynhausen, De | |
DE3840904C1 (en) * | 1988-12-05 | 1989-10-05 | Kreyenborg Verwaltungen Und Beteiligungen Kg, 4400 Muenster, De | |
DE3902061A1 (en) * | 1989-01-25 | 1990-07-26 | Gneuss Kunststofftechnik Gmbh | SCREEN DEVICE FOR CLEANING PLASTIC MELTS |
DE3941831C1 (en) * | 1989-12-19 | 1990-10-18 | Kreyenborg Verwaltungen Und Beteiligungen Kg, 4400 Muenster, De | |
AT399313B (en) * | 1990-07-23 | 1995-04-25 | Erema | FILTRATION DEVICE FOR THERMOPLASTIC PLASTIC MATERIAL |
US5200077A (en) * | 1991-04-08 | 1993-04-06 | Memtec America Corporation | Backflushable rotary melt polymer filter apparatus |
DE4116199A1 (en) * | 1991-05-17 | 1992-11-19 | Guenter Ing Grad Hartig | Fluid continuous self cleaning appts. for plastic melts - comprises transverse sliding cylindrical element with axially close filters progressively backflushed, for full flow area, on-line filter change and low pressure loss |
US5141631A (en) * | 1991-06-07 | 1992-08-25 | John Brown Inc. | Polymer filter with backflush pump |
US5320753A (en) * | 1991-06-18 | 1994-06-14 | The Dow Chemical Company | Continuous filter |
ATE135283T1 (en) * | 1992-05-11 | 1996-03-15 | Gneuss Kunststofftechnik Gmbh | FILTER FOR PLASTIC MELTS |
AT397927B (en) * | 1992-05-27 | 1994-08-25 | Chemiefaser Lenzing Ag | BACKFLOWABLE FILTER DEVICE FOR FILTRATION OF HIGH VISCUS LIQUIDS |
DE4338129A1 (en) * | 1993-11-08 | 1995-05-11 | Zimmer Ag | Process for polymer melt filtration |
US5462653A (en) * | 1994-02-15 | 1995-10-31 | Hills, Inc. | Apparatus for continuous polymer filtration |
EP0672443B1 (en) * | 1994-03-15 | 1999-11-03 | WIL-MAN POLYMER-FILTRATION GmbH | Control and filtering device for at least two partial fluid streams |
US5439589A (en) * | 1994-05-09 | 1995-08-08 | Trafalgar House Inc. | Sealing means for slide plate screen changer |
DE4426629C2 (en) * | 1994-07-27 | 1996-10-10 | Gneuss Kunststofftechnik Gmbh | Filters for plastic melts |
JPH08104899A (en) * | 1994-10-04 | 1996-04-23 | Sato Tekkosho:Kk | Multi-stage vacuum kneading and extrusion molding machine |
US5516426A (en) * | 1995-02-21 | 1996-05-14 | Hull; Harold L. | Self-cleaning filter system |
DE19636067A1 (en) * | 1995-09-18 | 1997-03-20 | Barmag Barmer Maschf | Filtering of plastic melt and filtering equipment for reducing flow variation |
AT404562B (en) | 1996-12-05 | 1998-12-28 | Bacher Helmut | FILTER DEVICE FOR IMPURITIES OF LIQUIDS |
CA2205450C (en) * | 1997-05-14 | 2001-07-24 | Alfredo Bentivoglio | Filter screen pack for extrusion die |
AT405488B (en) * | 1997-12-23 | 1999-08-25 | Bacher Helmut | METHOD AND DEVICE FOR CHANGING THE SCREEN ON A FILTER DEVICE |
IT1301853B1 (en) * | 1998-07-24 | 2000-07-07 | Previero Sas | NET ADVANCE DEVICE FOR FILTERING GROUP OF PLASTIC MATERIAL WITH CONTINUOUS FILTERING NET |
IT1301946B1 (en) * | 1998-07-28 | 2000-07-20 | Previero Sas | FILTRATION GROUP FOR MELTED PLASTIC MATERIAL WITH REPLACEABLE FILTERING ELEMENTS WITHOUT STOPPING THE FLOW OF MATERIAL. |
AT406355B (en) * | 1998-08-06 | 2000-04-25 | Bacher Helmut | DEVICE FOR INFLUENCING THE FLOW OF PLASTIC MATERIAL HEATED IN THE FLOWABLE CONDITION THROUGH A HOUSING |
JP3827868B2 (en) * | 1998-12-02 | 2006-09-27 | 株式会社日本製鋼所 | Screen changer |
US6168411B1 (en) * | 1999-03-18 | 2001-01-02 | Dynisco Extrusion, Inc. | Polymer filtration method and apparatus |
US6117338A (en) * | 1999-03-25 | 2000-09-12 | Solutia, Inc. | Continuous polymer melt filtration |
AT407611B (en) * | 1999-11-16 | 2001-05-25 | Econ Maschb Und Steuerungstech | BACKWASHING DEVICE FOR A FILTER DEVICE |
US6582598B2 (en) * | 2000-12-14 | 2003-06-24 | Hubert Patrovsky | Wave filter for rotary filter |
DE10225601A1 (en) * | 2002-06-07 | 2003-12-24 | Gneuss Kunststofftechnik Gmbh | Cleaning device for sieve disks |
DE10358672A1 (en) * | 2003-12-12 | 2005-07-21 | Gneuß Kunststofftechnik GmbH | Melt filter for cleaning plastic melts |
AT412768B (en) * | 2004-01-28 | 2005-07-25 | Erema | Backwashable filter for thermoplastics, includes control bodies displaced in casing relative to support body, for sectional backwashing of sieves |
US8628323B2 (en) * | 2009-06-25 | 2014-01-14 | Husky Injection Molding Systems Ltd. | Injection molding system including a melt filter, the filter being located before first instance of melt accumulation |
DE102010036810B4 (en) * | 2010-08-03 | 2018-05-30 | Nordson Holdings S.À R.L. & Co. Kg | Dirt separator for high-viscosity media |
DE102011001262B4 (en) * | 2011-03-14 | 2012-11-15 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg | Filtration device for highly viscous fluids |
DE102011051373B4 (en) * | 2011-06-27 | 2015-06-03 | Nordson Holdings S.À.R.L. & Co. Kg | Filtration device for fluids |
DE102013208628A1 (en) * | 2013-05-10 | 2014-11-13 | Gneuss Gmbh | Method for operating a Siebradfilters and Siebradfilter for performing the method |
US10265649B2 (en) * | 2013-06-18 | 2019-04-23 | Ettlinger Kunststoffmaschinen Gmbh | Discharge device and discharge method |
EP2921279B1 (en) * | 2014-03-20 | 2017-02-22 | Coperion GmbH | Device and method for homogenising plastic melts |
DE102014009768B4 (en) * | 2014-07-01 | 2018-05-24 | Maag Automatik Gmbh | Device for filtering a plastic melt |
CN104526908B (en) * | 2015-01-16 | 2017-07-21 | 陈艳 | Rapid impurity removal device |
EP3259109B1 (en) * | 2015-02-19 | 2022-05-18 | Next Generation Analytics GmbH | Filter device and filter method |
AT516379B1 (en) | 2015-02-19 | 2016-05-15 | Next Generation Analytics Gmbh | Filter device and method |
EP3088158B1 (en) * | 2015-04-29 | 2020-03-18 | Nordson PPS GmbH | Filtering device for high-visous fluids |
-
2016
- 2016-10-17 EP EP16002224.0A patent/EP3308940A1/en active Pending
-
2017
- 2017-10-10 US US15/728,865 patent/US10933357B2/en active Active
-
2021
- 2021-02-12 US US17/174,914 patent/US20210162324A1/en active Pending
Patent Citations (151)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1195576A (en) * | 1916-08-22 | garrahan | ||
US937676A (en) * | 1909-06-24 | 1909-10-19 | William S Elliott | Strainer. |
US2513795A (en) * | 1946-08-30 | 1950-07-04 | Western Electric Co | Strainer |
US2661497A (en) * | 1951-04-03 | 1953-12-08 | Celanese Corp | Extrusion apparatus |
US2763308A (en) * | 1952-06-11 | 1956-09-18 | Nat Plastic Products Company | Screen mounting for conduits and tubes for conveying fluids and for extrusion machines |
US2786504A (en) * | 1953-10-20 | 1957-03-26 | Nat Plastic Products Company | Screen changing apparatus for conduits and tubes for conveying fluids and for extrusion machines |
US2838084A (en) * | 1956-08-08 | 1958-06-10 | Nat Plastic Products Company | Screen changing method for conduits and tubes for conveying fluids and for extrusionmachines |
US3007199A (en) * | 1959-01-20 | 1961-11-07 | Albert Andy | Extruding head filter |
US3145746A (en) * | 1963-02-25 | 1964-08-25 | Nat Plastic Products Co Inc | Screen changing apparatus |
US3471017A (en) * | 1967-02-21 | 1969-10-07 | Peter Gabor Kalman | Filtering process and apparatus |
US3583453A (en) * | 1968-03-13 | 1971-06-08 | Messrs Windmoller & Holscher | Screen-changing apparatus for extruders |
US3653419A (en) * | 1969-04-16 | 1972-04-04 | Berstorff Gmbh Masch Hermann | Extruder screen plate change-over mechanism |
US3675934A (en) * | 1970-06-01 | 1972-07-11 | Eugene E Heston | Screen changer mounting |
US3817377A (en) * | 1970-07-17 | 1974-06-18 | Poly Converters Ltd | Method and apparatus for filtering flowable material |
US3804758A (en) * | 1972-03-29 | 1974-04-16 | Cosham Eng Design Ltd | Screen changer |
US3743101A (en) * | 1972-04-18 | 1973-07-03 | L Schmidt | Screen changer |
US3855126A (en) * | 1972-08-14 | 1974-12-17 | G Smith | Continuous incremental feed filtration process and apparatus |
US3940335A (en) * | 1972-08-29 | 1976-02-24 | Peter Gabor Kalman | Filtering process and apparatus |
US3900399A (en) * | 1972-11-18 | 1975-08-19 | Joachim Kreyenborg | Filter apparatus for extrusion presses |
US3799351A (en) * | 1972-12-13 | 1974-03-26 | F Tewes | Quick change filtering machine |
US3856277A (en) * | 1973-09-28 | 1974-12-24 | Gloucester Eng Co Inc | Screen assembly for processing plastic |
US3856680A (en) * | 1973-10-15 | 1974-12-24 | Mobil Oil Corp | Automatic screen changer for extruding processes |
US3971721A (en) * | 1974-12-31 | 1976-07-27 | Fogarty Jr John E | Continuous filter |
US4070293A (en) * | 1974-12-31 | 1978-01-24 | Fogarty Jr John E | Filter media |
US3962092A (en) * | 1975-01-10 | 1976-06-08 | The Dow Chemical Company | Screen changer |
US4021346A (en) * | 1975-03-17 | 1977-05-03 | Berthiaume Robert L | Filter for plastic extruding machine |
US4025434A (en) * | 1975-10-06 | 1977-05-24 | Bolton-Emerson, Inc. | Screen changer with pre-fill screen blocks |
US3983038A (en) * | 1975-11-03 | 1976-09-28 | Heston Eugene E | Self-purging screen changer and strainer plate |
US4059525A (en) * | 1976-06-28 | 1977-11-22 | Leonard L | Slide filters |
US4082487A (en) * | 1977-03-28 | 1978-04-04 | Western Electric Company, Inc. | Apparatus for changing screen devices |
US4167384A (en) * | 1977-11-28 | 1979-09-11 | The Japan Steel Works, Ltd. | Filter screen exchanging apparatus for plastic extruder |
US4159953A (en) * | 1978-06-05 | 1979-07-03 | The Berlyn Corporation | Slide plate filters for thermoplastic and similar materials |
US4238877A (en) * | 1978-12-22 | 1980-12-16 | Western Electric Company, Inc. | Fabrication of screen devices |
US4265756A (en) * | 1979-01-29 | 1981-05-05 | Schiesser Ag | Change device for sieves for filtering plastic materials |
US4237014A (en) * | 1979-03-12 | 1980-12-02 | Beringer Co., Inc. | Flowable material passage with interposable slide member |
US4359387A (en) * | 1979-03-12 | 1982-11-16 | Beringer Co., Inc. | Flowable material passage with interposable slide member |
US4257901A (en) * | 1979-08-13 | 1981-03-24 | Western Electric Co., Inc. | Cleanable filter and method of cleaning same |
US4268391A (en) * | 1979-11-28 | 1981-05-19 | The Berlyn Corporation | Leak proof filter plate system for slide plate filters |
US4395212A (en) * | 1980-04-03 | 1983-07-26 | Werner & Pfleiderer | Screen-change device for extruders |
US4416605A (en) * | 1981-05-07 | 1983-11-22 | Kabushiki Kaisha Kobe Seiko Sho | Screen/diverter changing mechanism for extruders |
US4507072A (en) * | 1982-10-25 | 1985-03-26 | E. I. Dupont De Nemours And Company | Diverting plate |
US4468322A (en) * | 1983-01-17 | 1984-08-28 | Thermoplas Machinery, Inc. | Slide plate screen changer |
US4701118A (en) * | 1985-07-03 | 1987-10-20 | Kreyenborg Verwaltungen Und Beteiligungen Kg | Apparatus for filtering plasticized materials in extruders |
US4728279A (en) * | 1985-10-03 | 1988-03-01 | Hermann Berstorff Maschinenbau Gmbh | Extrusion head including a sealing mechanism for a filter changing device |
US4842750A (en) * | 1985-10-04 | 1989-06-27 | Lucian Britchi | Apparatus for cleaning viscous materials |
US4725215A (en) * | 1986-02-26 | 1988-02-16 | Kreyenborg Verwaltungen Und Beteiligungen Kg | Extruder with exchangeable filter for foamed plastic material |
US4752386A (en) * | 1986-06-06 | 1988-06-21 | Erema Engineering-Recycling | Filter apparatus having filter elements shiftable between filtering and backwashing positions |
US4781563A (en) * | 1986-07-16 | 1988-11-01 | Hermann Berstorff Maschinenbau Gmbh | Filter changing mechanism including means for discharging residues of rubber or thermoplastics material from extrusion presses |
US4880374A (en) * | 1987-05-20 | 1989-11-14 | Fuji Photo Film Co., Ltd. | Filter exchange device for an extrusion molding machine |
US5032267A (en) * | 1987-10-29 | 1991-07-16 | Indupack Ag | Apparatus for filtering a heat-softened stream of plastic material |
US4814186A (en) * | 1988-02-29 | 1989-03-21 | Beringer Co., Inc. | Polymer filtration apparatus |
US4849113A (en) * | 1988-05-23 | 1989-07-18 | Hills William H | Continuous polymer filter |
US5061170A (en) * | 1989-12-08 | 1991-10-29 | Exxon Chemical Patents Inc. | Apparatus for delivering molten polymer to an extrusion |
US5632902A (en) * | 1990-11-16 | 1997-05-27 | Kalman; Peter G. | Filtering method and apparatus including valves with valve plugs of a cooled fluid substance |
US5417856A (en) * | 1991-03-25 | 1995-05-23 | Bacher; Helmut | Filter apparatus for fluids to be cleaned |
US6533934B1 (en) * | 1991-04-23 | 2003-03-18 | Josef Trendelkamp | Filter-replacement cassette |
US5464537A (en) * | 1992-12-23 | 1995-11-07 | Kopernicky; Jaroslav J. | Filtering debris from molten plastic |
US5525052A (en) * | 1993-02-26 | 1996-06-11 | Emil Lihotzky Maschinenfabrik | Extrusion machine |
US5417866A (en) * | 1993-07-02 | 1995-05-23 | Extek, Inc. | Continuous flow polymer filtration apparatus and process |
US5507498A (en) * | 1993-10-13 | 1996-04-16 | Synergy Extrusion Technologies, Inc. | Sealing device for polymer filtration apparatus |
US5578206A (en) * | 1993-12-27 | 1996-11-26 | The Japan Steel Works, Ltd. | Screen pack replacing apparatus |
US5578207A (en) * | 1994-05-03 | 1996-11-26 | Firma Kreyenborg Verwaltungen Und Beteiligungen Kg | Filter device for extruders having a screen plunger with longitudinally arranged candle filters |
US5605626A (en) * | 1994-06-01 | 1997-02-25 | Gneuss Kunststofftechnik Gmbh | Plate sieve changer |
US5756129A (en) * | 1994-07-01 | 1998-05-26 | Kabushiki Kaisha Kobe Seiko Sho | Filter member and screen changer for use in resin extruder |
USRE37681E1 (en) * | 1994-07-01 | 2002-04-30 | Kabushiki Kaisha Kobe Seiko Sho | Filter member and screen changer for use in resin extruder |
US5556592A (en) * | 1994-08-15 | 1996-09-17 | Hitchings; Jay | Filter indexing apparatus for filtering molten metal |
US5676731A (en) * | 1994-08-15 | 1997-10-14 | Hitchings; Jay | Method for filtering molten metal |
US5603828A (en) * | 1994-09-20 | 1997-02-18 | The Japan Steel Works, Ltd. | Filter screen changer for resin extruder |
US5840197A (en) * | 1995-04-19 | 1998-11-24 | The Japan Steel Works, Ltd. | Method for filtering a screen changer and a screen changer |
US5922194A (en) * | 1995-05-13 | 1999-07-13 | Firma Kreyenborg Verwaltungen Und Beteilgungen Gmbh & Co. Kg | Filter changing device for plastics processing plants |
US5607583A (en) * | 1995-07-03 | 1997-03-04 | Kreyenborg, Inc. | Filter device for extruders and injection-molding machines |
US5672269A (en) * | 1996-02-29 | 1997-09-30 | Illinois Tool Works Inc. | Filter/pressure relief assembly for an adhesive supply unit |
US5770067A (en) * | 1996-03-29 | 1998-06-23 | Wil-Man Polymer Filtration Gmbh | Device for filtering a fluid |
US5783223A (en) * | 1996-08-27 | 1998-07-21 | National Polymers Inc. | Plastic injection molding machine with continuous removal of particulate contaminants |
US6375013B1 (en) * | 1997-01-14 | 2002-04-23 | Josef Gail | Device for cleaning viscous material |
US6260852B1 (en) * | 1997-01-27 | 2001-07-17 | Paul Troester Maschinenfabrik | Sealing device for an annular gap between two sealing surfaces of machine parts |
US6010625A (en) * | 1997-10-16 | 2000-01-04 | Beringer Llc | Screen changer with controlled gap |
US6290846B1 (en) * | 1997-11-27 | 2001-09-18 | Wil-Man Polymer-Filtration Gmbh | Device for filtering molten plastic |
US6500336B1 (en) * | 1997-12-31 | 2002-12-31 | Gneuss Kunststofftechnik Gmbh | Polymer melt filtering device with changing filter packets |
US6196820B1 (en) * | 1998-03-11 | 2001-03-06 | Mannesmann Ag | Device for filtering plastics in injection molding machines |
US6422852B1 (en) * | 1998-04-30 | 2002-07-23 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg | Filter device for extruders and injection moulding machines |
US6342156B1 (en) * | 1999-09-17 | 2002-01-29 | Continental Pet Technologies, Inc. | Multi-segment continuous filtration system |
US6238558B1 (en) * | 2000-06-06 | 2001-05-29 | Beringer Llc | Filter changer with bimodal sealing means |
US20020158004A1 (en) * | 2001-04-02 | 2002-10-31 | Peter Emhardt | Device for filtering a liquid, particularly for filtering a polymer plastic melt |
US6641728B2 (en) * | 2001-04-02 | 2003-11-04 | Maag Pump Systems Textron Gmbh | Device for filtering a liquid, particularly for filtering a polymer plastic melt |
US20040191123A1 (en) * | 2001-10-15 | 2004-09-30 | Heinrich Collin | Apparatus for testing the purity of plastic melts |
US7124895B2 (en) * | 2002-06-29 | 2006-10-24 | Ettlinger Kunststoffmaschinen Gmbh | Device for continuous filtration of material blends |
US20050202114A1 (en) * | 2002-07-27 | 2005-09-15 | Berstorff Gmbh | Granulating device |
US20050016914A1 (en) * | 2002-09-17 | 2005-01-27 | Robert Middler | Device for filtering a fluid especially for plastic-processing installations |
US7419592B2 (en) * | 2002-09-17 | 2008-09-02 | Kreyenborg Verwaltungen Und Beteilgungen Gmbh & Co. Kg | Device for filtering a fluid especially for plastic-processing installations |
US6811685B2 (en) * | 2002-09-18 | 2004-11-02 | Exxonmobil Research And Engineering Company | Fouling mitigation device with movable screen |
US20060163145A1 (en) * | 2002-10-28 | 2006-07-27 | Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. | Backflushable filter device for molten material and distribution unit for a filter device of this type |
US7267234B2 (en) * | 2002-10-28 | 2007-09-11 | Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. | Backflushable filter device for molten material and distribution unit for a filter device of this type |
US20080023392A1 (en) * | 2002-10-28 | 2008-01-31 | Erema Engineering Recycling Maschinen Und Anlagen Gesellschaft M.B.H. | Backflushable filtering apparatus for molten material and distribution unit for a filter device of this type |
US7147774B2 (en) * | 2003-04-10 | 2006-12-12 | Polymer Systems, Inc. | Sliding plate filter with segmented sealing ring |
US20040200784A1 (en) * | 2003-04-10 | 2004-10-14 | Psi-Polymer Systems Inc. | Filtration apparatus for polymer processing and method |
US20070068867A1 (en) * | 2003-12-20 | 2007-03-29 | Roderich Ettlinger | Device for continuously filtering material mixtures |
US7824544B2 (en) * | 2003-12-20 | 2010-11-02 | Ettlinger Kunststoffmaschinen Gmbh | Device for continuously filtering material mixtures |
US20080217255A1 (en) * | 2004-08-19 | 2008-09-11 | Harald Pohl | Methods for Filtering a Fluid and an Apparatus and Filter Apparatus for Performing Said Method |
US20080197061A1 (en) * | 2006-01-24 | 2008-08-21 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co., Kg | Device For Filtering A Liquefied Synthetic Material |
US8017010B2 (en) * | 2006-01-24 | 2011-09-13 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co., Kg | Device for filtering a liquefied synthetic material |
US8017002B2 (en) * | 2006-08-30 | 2011-09-13 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co., Kg | Device for filtering a fluid, particularly for plastic processing plants |
US20080283460A1 (en) * | 2006-08-30 | 2008-11-20 | Kreyenborg Verwaltungen Und Beteligungen Gmbh & Co., Kg | Device for Filtering a Fluid, Particularly for Plastic Processing Plants |
US20100006492A1 (en) * | 2006-09-13 | 2010-01-14 | Helmuth Schulz | Apparatus for the continuous filtering of impurities from a flowable compound |
US7820039B2 (en) * | 2006-09-13 | 2010-10-26 | Helmuth Schulz | Apparatus for the continuous filtering of impurities from a flowable compound |
US8356625B2 (en) * | 2006-10-24 | 2013-01-22 | Gneuss Kunststofftechnik Gmbh | Device for the controlled guidance of a polymer melt |
US20110017681A1 (en) * | 2009-05-26 | 2011-01-27 | Bibey Joshua A | Filtration apparatus for filtering a fluid and methods of using the same |
US20110291319A1 (en) * | 2009-11-30 | 2011-12-01 | James Frederick Avery | Methods of Extruding a Honeycomb Body |
US8673206B2 (en) * | 2009-11-30 | 2014-03-18 | Corning Incorporated | Methods of extruding a honeycomb body |
US9855699B2 (en) * | 2010-06-01 | 2018-01-02 | Nordson Holdings S.a.r.l. & Co. KG | Filtering device for highly viscous media |
US20130126410A1 (en) * | 2010-09-08 | 2013-05-23 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Screen unit and screen changer equipped with same |
US9295930B2 (en) * | 2010-10-25 | 2016-03-29 | Maag Automatik Gmbh | Device for filtering a plastic melt |
US20130292316A1 (en) * | 2010-10-25 | 2013-11-07 | Maag Pump Systems Gmbh | Device for filtering a plastic melt |
US9364778B2 (en) * | 2011-06-01 | 2016-06-14 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg | Filtering device for highly viscous fluids |
US20140197092A1 (en) * | 2011-06-01 | 2014-07-17 | Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg | Filtering device for highly viscous fluids |
US20130020247A1 (en) * | 2011-07-21 | 2013-01-24 | Saemann Hans-Joachim | Filter unit for an extruder system and filter arrangement and associated sieve changing device for an extruder system with a filter unit of this type |
US20130087975A1 (en) * | 2011-10-06 | 2013-04-11 | Kolcor Technologies LLC | Sealing Device In A Polymer Filtration Device |
US9090002B2 (en) * | 2011-10-06 | 2015-07-28 | Kolcor Technologies LLC | Sealing device in a polymer filtration device |
US20150048016A1 (en) * | 2012-01-26 | 2015-02-19 | Nordson Holdings S.a.r.l. & Co. KG | Filtering device for the large-area filtration of fluids |
US20150014257A1 (en) * | 2012-03-26 | 2015-01-15 | Parkinson Machinery & Manufacturing | Kch hybrid screen changers |
US20150014238A1 (en) * | 2012-03-30 | 2015-01-15 | Maag Pump Systems Gmbh | Device for filtering a thermoplastic melt |
US8851332B2 (en) * | 2012-05-18 | 2014-10-07 | Jeff L. Mercer | Adhesive filtration system |
US8876517B2 (en) * | 2012-09-28 | 2014-11-04 | Nordson Corporation | Filtration apparatus with a sealing device |
US10307953B2 (en) * | 2013-04-12 | 2019-06-04 | Alfatech S.R.L. | Automatic screen changer device |
US20140353261A1 (en) * | 2013-05-28 | 2014-12-04 | Parkinson Machinery & Manufacturing | Kcr screen changer |
US20160001485A1 (en) * | 2014-07-01 | 2016-01-07 | Sino-Alloy Machinery Inc. | Extruder filter replacement and backwash structure |
US20180050481A1 (en) * | 2015-03-09 | 2018-02-22 | Dr. Collin Gmbh | Device and method for testing materials |
US11148340B2 (en) * | 2016-03-21 | 2021-10-19 | C M Produzione S.R.L. | Filtration device and filtration method for polymer extrusion |
US20190091916A1 (en) * | 2016-03-21 | 2019-03-28 | C M Produzione S.R.L. | Filtration device and filtration method for polymer extrusion |
US10933357B2 (en) * | 2016-10-17 | 2021-03-02 | Next Generation Analytics Gmbh | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
US20180104625A1 (en) * | 2016-10-17 | 2018-04-19 | Next Generation Analytics Gmbh | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids |
US20230285878A1 (en) * | 2016-10-31 | 2023-09-14 | Westlake Longview Corporation | Candle Filter Support and Plate Assembly for Polymer Melts |
US10188968B2 (en) * | 2016-10-31 | 2019-01-29 | Westlake Longview Corporation | Candle filter support and plate assembly for polymer melts |
US20190111362A1 (en) * | 2016-10-31 | 2019-04-18 | Westlake Longview Corporation | Candle Filter Support and Plate Assembly for Polymer Melts |
US20180117504A1 (en) * | 2016-10-31 | 2018-05-03 | Westlake Longview Corporation | Candle Filter Support and Plate Assembly for Polymer Melts |
US11691094B2 (en) * | 2016-10-31 | 2023-07-04 | Westlake Longview Corporation | Candle filter support and plate assembly for polymer melts |
US10814254B2 (en) * | 2016-10-31 | 2020-10-27 | Westlake Longview Corporation | Candle filter support and plate assembly for polymer melts |
US20210008471A1 (en) * | 2016-10-31 | 2021-01-14 | Westlake Longview Corporation | Candle Filter Support and Plate Assembly for Polymer Melts |
US10828820B2 (en) * | 2016-11-21 | 2020-11-10 | PSI-Polymer Systems, Inc. | Extrusion die systems, die changers, and related methods |
US20180345561A1 (en) * | 2016-11-21 | 2018-12-06 | PSI-Polymer Systems, Inc. | Extrusion die systems, die changers, and related methods |
US11260570B2 (en) * | 2018-05-07 | 2022-03-01 | PSI-Polymer Systems, Inc. | Filtration apparatuses and screen changer devices for polymer processing and related methods |
US20220355531A1 (en) * | 2018-05-07 | 2022-11-10 | PSI-Polymer Systems, Inc. | Filtration apparatuses and screen changer devices for polymer processing and related methods |
US20190337215A1 (en) * | 2018-05-07 | 2019-11-07 | PSI-Polymer Systems, Inc | Filtration apparatuses and screen changer devices for polymer processing and related methods |
US20220097274A1 (en) * | 2019-01-08 | 2022-03-31 | Chtc Bio-Based Material Engineering & Technology(Ningbo) Co., Ltd. | Method and device for directly preparing foamed polylactic acid (pla) product from pla melt |
US20200262125A1 (en) * | 2019-02-08 | 2020-08-20 | PSI-Polymer Systems, Inc. | Modular fluid processing apparatuses, modular components and related methods |
US11724431B2 (en) * | 2019-02-08 | 2023-08-15 | PSI-Polymer Systems, Inc. | Modular fluid processing apparatuses, modular components and related methods |
US20230356449A1 (en) * | 2019-02-08 | 2023-11-09 | PSI-Polymer Systems, Inc. | Modular fluid processing apparatuses, modular components and related methods |
US20220212129A1 (en) * | 2019-05-15 | 2022-07-07 | Nordson Corporation | Fluid Filtering System With Backflush Valve And Methods Of Operating The Same |
US20230356118A1 (en) * | 2019-11-28 | 2023-11-09 | Nordson Corporation | Apparatus for filtering a fluid, in particular a plastic melt having impurities, and a valve arrangement for such a fluid |
US20220118383A1 (en) * | 2020-10-15 | 2022-04-21 | Bd Plast Filtering Systems S.R.L. | Filter device for filtering extruded polymers and cleaning method |
US20230264407A1 (en) * | 2022-02-24 | 2023-08-24 | Coperion Gmbh | Filter unit for an extruder assembly, filter arrangement and corresponding filter changing device and method for producing such a filter unit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11260570B2 (en) * | 2018-05-07 | 2022-03-01 | PSI-Polymer Systems, Inc. | Filtration apparatuses and screen changer devices for polymer processing and related methods |
US20220355531A1 (en) * | 2018-05-07 | 2022-11-10 | PSI-Polymer Systems, Inc. | Filtration apparatuses and screen changer devices for polymer processing and related methods |
Also Published As
Publication number | Publication date |
---|---|
EP3308940A1 (en) | 2018-04-18 |
US10933357B2 (en) | 2021-03-02 |
US20180104625A1 (en) | 2018-04-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20210162324A1 (en) | Filter system for viscous or highly viscous liquids, in particular plastic melts and method for filtering viscous or highly viscous liquids | |
KR102490656B1 (en) | Filtering device and cleaning unit for removing dirt particles from a filter element of a filtering device | |
JP6738168B2 (en) | FILTER UNIT, FILTER CHIP CONVEYOR HAVING THE SAME, AND FILTERING METHOD BY FILTER CHIP CONVEYOR | |
EP3259109B1 (en) | Filter device and filter method | |
US6378705B1 (en) | Apparatus for filtering plasticized thermoplastics | |
US3856680A (en) | Automatic screen changer for extruding processes | |
US20110017681A1 (en) | Filtration apparatus for filtering a fluid and methods of using the same | |
US7419592B2 (en) | Device for filtering a fluid especially for plastic-processing installations | |
US20170312658A1 (en) | Filter for extruder press | |
EP1519823A1 (en) | Device for the continuous filtration of material blends | |
US4318677A (en) | Small volume outlet apparatus with a sieve changing device for multiple shaft screw machines | |
EP2789447B1 (en) | Automatic screen changer device | |
KR102092190B1 (en) | Discharge device and discharge method | |
US20190255795A1 (en) | Pressure granulation machine for molded products | |
EP2602087B1 (en) | Apparatus and process for filtering plastic materials | |
US10828820B2 (en) | Extrusion die systems, die changers, and related methods | |
JPH06227651A (en) | Device for classifying and passing over material which can flow | |
EP1656211A1 (en) | Nozzle and filter arrangement and system for applying a fluid containing solid particles to a substrate | |
US4280907A (en) | Separating device | |
DE102008014054B4 (en) | Belt filter Melt filter with venting and decontamination device and / or melt-sealing device (s) for processing melts and / or plastic media | |
CN107257705B (en) | Device and method for separating particles from a gas flow | |
JP2005041015A (en) | Filter apparatus for molten plastic | |
US5316225A (en) | Shredding straining apparatus | |
RU2723396C1 (en) | Method of cleaning fluids from mechanical impurities | |
EP3292981A1 (en) | Method and device for filtration of viscous or highly viscous fluids, especially plastic melts |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STPP | Information on status: patent application and granting procedure in general |
Free format text: APPLICATION DISPATCHED FROM PREEXAM, NOT YET DOCKETED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |