EP1663443A1 - Procedes pour filtrer un fluide et dispositif et unite de filtrage pour mettre en oeuvre lesdits procedes - Google Patents

Procedes pour filtrer un fluide et dispositif et unite de filtrage pour mettre en oeuvre lesdits procedes

Info

Publication number
EP1663443A1
EP1663443A1 EP05773579A EP05773579A EP1663443A1 EP 1663443 A1 EP1663443 A1 EP 1663443A1 EP 05773579 A EP05773579 A EP 05773579A EP 05773579 A EP05773579 A EP 05773579A EP 1663443 A1 EP1663443 A1 EP 1663443A1
Authority
EP
European Patent Office
Prior art keywords
fluid
filter
throttle
filter device
filtered
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.)
Withdrawn
Application number
EP05773579A
Other languages
German (de)
English (en)
Inventor
Harald Pohl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maag Pump Systems GmbH
Original Assignee
Maag Pump Systems Textron GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maag Pump Systems Textron GmbH filed Critical Maag Pump Systems Textron GmbH
Publication of EP1663443A1 publication Critical patent/EP1663443A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/04—Controlling the filtration
    • 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
    • B29C48/255—Flow control means, e.g. valves
    • B29C48/2554—Flow control means, e.g. valves provided in or in the proximity of filter devices
    • 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
    • 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
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92085—Velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92085—Velocity
    • B29C2948/92104—Flow or feed rate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/922—Viscosity; Melt flow index [MFI]; Molecular weight
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92209—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92295—Errors or malfunctioning, e.g. for quality control
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92476—Fluids, e.g. for temperature control or of environment
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92495—Treatment of equipment, e.g. purging, cleaning, lubricating or filter exchange
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/9299—Treatment of equipment, e.g. purging, cleaning, lubricating or filter exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • 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

Definitions

  • the present invention relates to a first method for filtering a fluid, in particular for filtering a polymer melt, with the features of the preamble of patent claim I 7 a second method for filtering a fluid, in particular for filtering a polymeric melt, with the features of the preamble of patent claim 2, a Vorrich ⁇ device for carrying out this method with the features of the preamble of claim 8 and a filter device for carrying out the method with the features of the Oberbe ⁇ handle of claim 25th
  • the present invention is based on the object of providing a first method, a second method, a device and a filter device for carrying out the method, which provide particularly gentle filtration of a Fluids, in particular a particularly gentle filtration of a polymeric melt allow.
  • the inventive method for filtering a fluid provides that a pressurized stream of the fluid is continuously passed through at least one filter and thereafter the thus filtered fluid is supplied to a tool, as well as at the beginning of the prior art also the case.
  • the flow of the filtered fluid and / or the flow of the filtered fluid is throttled, with at least one actual value of a working parameter of the fluid being measured.
  • the actual value is compared with a predefinable, ie thus adjustable, setpoint value, so that at least one manipulated variable is generated as a function of at least one actual setpoint value deviation.
  • the first method according to the invention is based on the one hand in the fluid flow at least one throttle is arranged, which is po ⁇ sitioned either upstream of the filter, downstream of the filter or upstream and downstream of the filter in the fluid stream and on the other hand, the degree of throttling gesteu ⁇ ert, wherein for this control the actual value of a Hä ⁇ parameters of the fluid measured and this measured actual value of the fluid is compared with a predetermined target value, so that then at an actual target value deviation the for the controller required manipulated variable is generated by which the opening degree of the throttle is changed.
  • the inventive method has a number of advantages.
  • the time of filter change is not determined empirically by the method according to the invention, as in the known method, but this time is determined exactly on the basis of measured values recorded. This makes it possible that a filtration of the fluid carried out according to the method according to the invention is made particularly reproducible, so that accordingly the inventive device can be operated with a reduced personnel expenditure, without unwanted downtime occurring auf ⁇ .
  • the process according to the invention allows this pressure constant to prevail upstream of the filter, whereby undesirable chemical and / or physical property changes of the polymer melt are preferably avoided in the case of pressure-sensitive polymeric melts.
  • This constant pressure which is present in particular upstream of the filter in the method according to the invention, further protects the device positioned there for generating the pressurized flow of the fluid, wherein it is This is preferably an extruder, a corresponding pump or a pressurized fluid supply.
  • the pressure constancy provided in the process according to the invention causes the gases which are often contained in the fluid to be filtered, which are to be removed before the filtration process, to be let off at one and the same point upstream of the filter, which in the known methods because of the previously described printing cycles is not the case.
  • the fluid to be filtered which is preferably a polymeric melt, is degassed optimally, which has a considerable positive influence on the quality of the workpiece produced by the tool, so that by applying the method according to the invention not only improved workpieces (extrudates) can be produced but also the rate of defective workpieces is reduced.
  • fluid used in the present application covers in particular a polymeric melt, preferred examples of such a polymeric melt being the plastics polypropylene, polyethylene, high-pressure polypropylene, low-density polyethylene, linear low-density polyethylene, polystyrene, polyamide, alkyl Butadiene-styrene (ABS), polyester, polyoxymethylene (POM), polyacrylates, in particular polymethyl methacrylates (PMMA) and polyvinyl chloride.
  • a basically second method according to the invention for filtering a fluid, in particular for filtering a polymer melt provides that a pressurized stream of the fluid is continuously passed through at least one filter and thereafter the thus filtered fluid is supplied to a tool.
  • the flow of the fluid to be filtered and / or the filtered fluid is throttled, but in the case of the second method according to the invention the actual value of the degree of throttling is preset to one A value is set.
  • This second method according to the invention differs from the first method according to the invention in that in this case the degree of throttle is specified, that an actual value of a parameter of the fluid is measured and that the actual value of the degree of throttling is changed until the actual value of the working parameter of the fluid assumes an input and constant setpoint value, so that this second embodiment of the method according to the invention also makes possible a reproducible and pressure-constant filtration of the fluid.
  • the degree of throttling is set and changed until the actual value of the working parameter assumes a constant, input desired value, wherein In the course of the filtration process and with increasing contamination of the filter, this tuning is constantly repeated and adapted accordingly.
  • the actual value of the working parameter of the fluid which is to be measured in the method according to the invention, it is generally to be stated that any measuring method and thus any measured value is suitable for this purpose, which also changes when the degree of contamination of the filter changes.
  • the actual value of the working parameter of the fluid is measured by the pressure, the flow rate, the flow rate, the temperature and / or the viscosity of the fluid to be filtered and / or of the filtered fluid.
  • the flow of the fluid is throttled depending on the degree of contamination of the filter and / or the number of filters available for the filtration, the degree, i. the size, this throttle - generally speaking - depends on how the measured actual value of a working parameter of the fluid changes with regard to an adjustable desired value of the fluid.
  • a highly contaminated fluid for example a polymeric melt of a recycle material
  • an embodiment of the process according to the invention is used in which the flow of the filtered fluid is throttled ge.
  • This embodiment of the method according to the invention has the advantage that the throttle, which is in this case arranged downstream of the filter, can not be so easily contaminated, since the relevant throttle element comes into contact only with filtered fluid.
  • a particularly suitable embodiment of the method according to the invention provides that in this embodiment the pressure of the fluid to be filtered is measured as the actual value of the working parameter of the fluid, so that when a predetermined pressure value is exceeded, that in the above sense is denoted as set value, the degree of Drosse ⁇ ment is reduced and that falls below a predetermined pressure value nen the degree of throttling is increased.
  • the degree of throttling is thus changed depending on the pressure prevailing upstream of the filter in such a way that there is a filter at the beginning of the filtration in which a filter not loaded with dirt or only slightly loaded is present and accordingly the pressure relatively low value, high throttling takes place.
  • the degree of throttling is verrin ⁇ siege, which means that the throttle further opens and the pressure is lowered and maintained at a constant pressure .
  • the degree of throttling is then reduced so that the throttle has almost no or no influence on the fluid flow.
  • the degree of throttling is increased, so that at this time upstream of the filter again, prevails, prevailing over the entire cycle constant initial pressure.
  • the present invention furthermore relates to a device for carrying out the method according to the invention described above.
  • the device according to the invention has a device, in particular an extruder, for producing a continuous stream of a pressurized fluid, in particular a polymer melt. This is followed, viewed in the flow direction of the fluid to be filtered, by a filter device which has at least one filter for filtering the fluid. has, so that the fluid is filtered by this filter means. At least one tool follows this filter device in the device according to the invention. Furthermore, in the device according to the invention, a detection device for the actual value of a working parameter of the fluid is assigned to the region upstream and / or downstream of the filter device, wherein upstream and / or downstream of the filter device a throttle is also provided in the flow of the fluid.
  • the detection device In the event of a deviation of the actual value of the working parameter of the fluid from a prescribable, ie adjustable, desired value of the working parameter of the fluid, the detection device generates a manipulated variable for varying the opening degree of the throttle, such that the contamination of the reactor increases at least one filter, the degree of opening of the throttle is continuously increased.
  • the device according to the invention essentially differs from the known devices in that in the device according to the invention a throttle is arranged in the flow path of the fluid whose degree of opening depends on a detected and with a predetermined value of the fluid ver ⁇ Value is varied such that with increasing Ver ⁇ pollution of the filter, the opening degree of the throttle is increased, while at the beginning of the filtration, ie at a time when the filter is not dirty, the opening degree of the throttle is low, so that accordingly this throttle opposes the fluid flow with a corresponding resistance.
  • the device according to the invention ensures that, irrespective of the degree of contamination of the filter and the opening degree of the throttle, a constant amount of fluid per unit time is supplied to the tool provided downstream of the filter device over the entire period.
  • the device according to the invention has all the advantages listed above for the method according to the invention. It should also be noted here that in the device according to the invention the time of the filter change is not determined empirically, as in the known devices, but instead that this time is determined exactly on the basis of detected measured values. As a result, not only is the filtration of the fluid to be carried out by means of the device according to the invention made particularly re-producible, but the device according to the invention can also be operated with a reduced personnel expenditure, without unwanted downtimes or interruptions occurring.
  • the Opening degree and thus also their back pressure verän ⁇ derable and is particularly adaptable can be in the inventive device, the rising pressure upstream of the filter by increasing the opening degree of the throttle compensate, so that the device according to the invention a pressure-constant Fil ⁇ tration of the fluid while maintaining a constant Vo ⁇ lumenstromes of filtered fluid per unit time to the tool allows.
  • the device according to the invention allows this constant pressure to prevail upstream of the filter, whereby undesirable chemical and / or physical property changes of the polymer melt are preferably avoided in the case of pressure-sensitive polymeric melts.
  • This constant pressure which is preferably present upstream of the filter in the device according to the invention, moreover protects the devices positioned there for generating the pressurized flow of the fluid, in particular an extruder, a corresponding pump or a pressurized one standing fluid supply is.
  • the pressure constancy present in the device according to the invention has the effect that often gases to be removed in the fluid to be filtered, which are to be removed before the filtration process, can be discharged at one and the same point upstream of the filter, which in the known devices the previously described printing cycles are not or only very expensive the case.
  • the fluid to be filtered in which it is preferably is a polymeric melt, optimally degassed, which has a significant positive influence on the quality of the workpiece produced by the tool, so that not only improved workpieces can be produced by the inventive device but also the rate of defective workpieces is reduced.
  • the detection device is designed in such a way that the detection device detects as the actual value of the working parameter of the fluid such a measured value which changes when the degree of contamination of the Filters also changes.
  • the detection device provided in the device according to the invention is designed such that it detects the actual value of the working parameter of the fluid pressure, the flow rate, the fürflußgeschwin ⁇ speed, the temperature and / or the viscosity of the fluid.
  • a preferred embodiment of the Vorrich ⁇ device provides that the detection device auf ⁇ has a pressure sensor for detecting the fluid pressure upstream or downstream or upstream and downstream of the filter device, wherein in the first two cases in which the fluid pressure upstream or downstream of the Filter device er ⁇ is taken, a pressure and in the latter case (upstream and downstream) a differential pressure is measured. Furthermore, the Erfas ⁇ sungs worn is designed so that the so as Agricultureparame ⁇ ter of the fluid detected pressure actual value or the differential pressure actual value with the predetermined, ie adjustable, desired pressure value or differential pressure target value is compared and that so ⁇ soon the actual value exceeds the setpoint value, a manipulated variable is generated er ⁇ which causes an increase in the opening degree of the throttle.
  • This embodiment of the device according to the invention has the decisive advantage that in this way in a particularly simple and reproducible manner, in particular the pressure can be kept constant upstream of the filter device, it being noted as an additional advantage of this embodiment of the device according to the invention that the here vorgese ⁇ Henen pressure sensors are inexpensive and are characterized by a low maintenance and störunan réellee mode of operation.
  • Another embodiment of the device according to the invention comprises such a detection device which is provided with at least one temperature sensor for detecting the fluid temperature upstream and / or downstream of the filter device or for Erfas ⁇ solution of a differential temperature.
  • the temperature actual value of the fluid or the difference temperature actual value determined in this way is compared in the detection device with the predeterminable temperature setpoint value or predefinable difference temperature setpoint value, so that as soon as the Actual value exceeds the setpoint value, a manipulated variable is generated by the detection device, which causes an increase in the opening degree of the throttle.
  • This embodiment of the device according to the invention is preferably used when the device according to the invention a thin liquid polymer melt is to be filtered.
  • a particularly advantageous development of the device according to the invention provides that in this case the throttle is arranged upstream of the filter device.
  • This embodiment is always preferably used when the fluid to be filtered has only a relatively low degree of contamination, so that there is no danger here that the functionality of the throttle is impaired by deposited dirt particles.
  • the throttle which is arranged upstream of the filter device, associated with a valve or this valve is integrally formed with the throttle, said valve in its open position, a fluid flow to the atmosphere derived.
  • This embodiment of the inventive The device is always preferably used when the respective fluid to be filtered, in particular the polymer melt to be filtered, tends to form particulate agglomerates even at short standstill times. These particle-shaped agglomerates can then be removed from the device according to the invention by means of the valve at the beginning of the filtration, so that these agglomerates do not contaminate the filter at the beginning of the filtration.
  • Another embodiment of the device according to the invention provides that in this case the throttle is arranged downstream of the filter device.
  • This embodiment of the device according to the invention is always used when the fluid to be filtered is heavily contaminated, the advantage of such an arrangement of the throttle being that the throttle provided downstream of the filter device does not come into contact with contaminated fluid ,
  • this embodiment of the device according to the invention is distinguished by a high degree of operational reliability, so that it is preferably also used for filtering polymeric recycling material melts.
  • a particularly fine tuning of the degree of throttling of the fluid flow is achieved in the apparatus according to the invention in that upstream and downstream of the filter device in each case a throttle is provided.
  • a dermar ⁇ term embodiment of the device according to the invention can be heavily soiled polymeric melts, less polluted polymers Melting and also melting such melts tend to form solid agglomerates, so that depending on the respective contamination of the polymer melt to be filtered or its properties, in the case of heavily soiled polymer melt, preferably only those arranged downstream of the filter device Throttle, with less heavily soiled melt both throttles together or individually a throttle is set ein ⁇ , while in those melts which tend to form agglomerates, additionally arranged upstream of the Fil ⁇ ter sensory throttle for discharging the agglomerates at the beginning of a filtration can be used.
  • this embodiment of the device according to the invention is universally
  • this throttle is designed so that its degree of opening is to be changed within narrow limits and that, furthermore, the throttle is designed such that dead spaces are minimized.
  • a particularly störunan réellee embodiment of erfindungsge ⁇ MAESSEN device has a throttle, which is provided with a through-flow of the fluid receiving space.
  • This receiving space is preferably a pipe section through which the fluid flows, this receiving chamber having a throttle element penetrating into the fluid.
  • the throttle element between a first position in which the fluid stream is almost interrupted, so that there is a low ⁇ ff ⁇ tion of the throttle, and a second position in which the fluid flow through the throttle element is not or almost not hindered, so that there is a high degree of opening of the throttle, and vice versa, movable.
  • the throttle element is designed as a flat slide and a pipe section through which the fluid flows, assigned, so that the degree of ⁇ ff ⁇ opening of the throttle is adjustable by a movement of this flat slide.
  • a further development of the previously described embodiment of the device according to the invention provides a throttle in which the throttle element as a cylindrical throttle piston and the receiving space are formed as a cylindrical receiving space, wherein the flow of fluid is passed through this cylindrical Auf ⁇ receiving space.
  • the cylindrical throttle piston is axially displaceably mounted in the cylindrical receiving space between the previously described first position and the second position, so that the degree of opening of the throttle can be changed as desired by an axial displacement of the cylindric throttle element.
  • a pipe section, through which the fluid is guided can serve as a receiving space, this pipe section then having a correspondingly shaped housing area for guiding and holding the cylindrical throttle element.
  • the throttle element In the case of an axial displacement of the cylindrical throttle element whose diameter is greater than the cross section of the pipe section, the throttle element then penetrates into the receiving space designed as a pipe section and then, depending on its penetration depth, effects the desired throttling of the fluid flow.
  • a cylindrical throttle element which is provided with a passage opening corresponding to the cross section of the pipe section, preferably a cylindrical throughbore, wherein this throttle is mounted in a housing section such that an axial displacement of the housing cylindrical throttle element, the passage opening provided therein more or less fluch ⁇ with the pipe inner wall, whereby the degree of opening of the throttle is particularly easy and accurate adjustable.
  • the throttle has a conically formed receiving space, whereby within this receiving space there is arranged a likewise adapted throttle element which is adapted thereto.
  • the conical throttle element between the first position and the second position is axially displaceable, wherein the receiving space a upstream of the throttle element arranged fluid supply part channel and a downstream of the throttle element provided Fluidabschreib- partial channel are assigned. The flow of the fluid in the receiving space and via the fluid discharge sub-channel is removed from the receiving space via the fluid supply sub-channel. Due to the conicity of the receiving space and the throttle element, this configuration of the throttle allows a very fine adjustment of the opening degree of the throttle, at the same time preventing the conical walls of the receiving space and the throttle unwanted deposition of fluid residues.
  • the fluid removal part channel has a seen in Strömungsrich ⁇ direction of the fluid first portion which ver ⁇ on both sides of the housing of the receiving space ver ⁇ runs and which opens into the fluid discharge part channel, the previously mentioned advantages are achieved to a particularly high degree by a choke configured in this way.
  • the first portion of the Fluidabschreibteilkanals seen in the flow direction of the fluid as an annular channel remplibil ⁇ det, the annular channel partially or completely enclosing the housing of the receiving space from the outside, as will be explained below with reference to a specific embodiment.
  • the throttle element of the previously described embodiment is moved as a function of the manipulated variable generated by the detection device.
  • This movement which preferably represents an axial displacement of the throttle element, can be effected either manually or preferably automatically, for which purpose a drive for the axial movement of the same is assigned to the throttle element. is orders.
  • This drive is designed in particular as a hydraulic, pneumatic or electric drive.
  • a development of the previously described embodiment of the device according to the invention provides that the throttle element is moved only over a predetermined size and preferably displaced axially.
  • This predetermined size lies between the first and second position of the throttle element, so that accordingly the opening degree of the throttle is increased or reduced.
  • an optical and / or acoustic signal is generated, so that when this signal occurs the operator is displayed that a filter change is required.
  • a further embodiment of the previously described embodiment of the device according to the invention provides that, when the predetermined size is exceeded, backwashing of a contaminated filter is automatically triggered.
  • this embodiment of the device according to the invention requires at least two filters, these two filters optionally having a first position in which they both filter the fluid flow and in a second position in which one filter filters the fluid flow while the other one Filter with a partial flow of filtered fluid opposite to the flow direction during filtration is backwashed, are movable.
  • the partial flow of filtered fluid then dissolves the contaminants accumulated on the filter surface and, opposite to the flow direction of the fluid during filtration, leads it to the atmosphere via a suitable valve upstream of the filter device, so that after completion of this backwashing process, a flow of Dirt-depleted filter for re-filtration is provided again.
  • the device according to the invention may comprise all filter devices known per se, in which case the band filters described in the prior art can be used as examples. are.
  • the device according to the invention comprises a filter device which has at least two filters arranged at an axial distance from one another within a bolt mounted in a housing and axially displaceable for this purpose.
  • the at least two filters can be flowed through with the fluid to be filtered or at least one filter is flowed through with the fluid to be filtered, while at the same time the at least one other filter is in a position outside the filter device, so that this one, filters located outside the filter device can be manually replaced by the respective operating personnel and cleaned or replaced and replaced by a new filter.
  • Another, likewise advantageous embodiment of the device according to the invention comprises a filter device which has two bolts arranged inside a housing and axially displaceable for this purpose, each being provided with at least two filters arranged at an axial distance from each other.
  • these bolts are mounted in corresponding housing bores in a fluid-tight and axially displaceable manner, whereby optionally all filters are flowed through by the fluid to be filtered or at least one filter is located in a position outside the filter device, while the remaining other filters are separated from the filter the fluid to be filtered flows through it.
  • the present invention further relates to a filter device for carrying out the method according to the invention.
  • the filter device according to the invention has a first An ⁇ circuit element for connecting the filter device with a Device, in particular with an extruder, for generating ei ⁇ nes continuous flow of a pressurized fluid, in particular a polymeric melt on. Furthermore, a second connecting element is provided, which connects the filter device according to the invention with a tool, wherein the inventive filter device comprises at least one filter through which fluid flows.
  • a detection device for the actual value of a working parameter of the fluid is arranged between the first connection element and the filter and / or between the filter and the second connection element, upstream and / or downstream of the filter device, ie
  • a throttle between the first connection element and the filter and / or between the filter and the second connection element, further provided in the flow of the fluid, a throttle.
  • the detection device In the case of a deviation of the actual value of the working parameter of the fluid from a predefinable, ie adjustable, desired value of the working parameter of the fluid, the detection device generates a manipulated variable for changing the opening degree of the throttle, such that with increasing contamination of the at least one Filters the degree of opening of the throttle is increased continuously.
  • the filter device according to the invention essentially differs from the known devices in that a throttle in the flow path of the fluid upstream and / or downstream of the filter is arranged in the filter device according to the invention, whose degree of opening depends on a detected and compared with a predetermined value of the fluid value is varied such that with increasing contamination of the filter, the opening degree of the throttle is increased, while at the beginning of the filtration, ie at a time when the filter is not dirty, the opening degree of the Throttle is low, so that accordingly this throttle the fluid flow ent speaking resistance (back pressure) opposes.
  • the filter device according to the invention ensures that, regardless of the degree of contamination of the filter and the degree of opening of the throttle, a per Time unit constant amount of fluid is supplied to the tool provided downstream of the Filtereinrich ⁇ .
  • the filter device according to the invention has all the advantages listed above for the method according to the invention and the device according to the invention.
  • the time of the filter change is not determined empirically, as in the case of the known devices, but that this point in time is determined exactly on the basis of detected measured values. In this way, not only is the filtration of the fluid to be carried out by means of the filter device according to the invention made particularly reproducible, but the filter device according to the invention can also be operated with reduced personnel expenditure without undesirable downtimes or interruptions occurring.
  • a back pressure generating throttle is present, whose opening degree and thus their Ge gy pressure changeable and is particularly adaptable, can be compensated in the filter device according to the invention, the rising pressure upstream of the filter by increasing the degree of opening of Dros ⁇ sel, so that the filter device according to the invention a pressure-constant filtration of the fluid while maintaining ei ⁇ nes a constant volume flow of filtered fluid per unit time to the tool allows.
  • the filter device according to the invention permits this pressure consistency to prevail upstream of the filter, whereby undesirable chemical and / or physical property changes of the polymer melt are preferably avoided in the case of pressure-sensitive polymeric melts.
  • This constant pressure which is preferably present upstream of the filter in the filter device according to the invention, further protects the devices positioned there for generating the pressurized flow of the device Fluids, which is in particular an extruder, a corresponding pump or a pressurized fluid reservoir.
  • the pressure constancy present in the filter device according to the invention causes gases which are often to be removed in the fluid to be filtered, which are to be removed before the filtration process, to be discharged at one and the same point upstream of the filter, which is known in the art Devices because of the Druckzy ⁇ initially described Klen not or only very expensive the case.
  • the fluid to be filtered which is preferably a polymeric melt, is optimally degassed, which has a considerable positive influence on the quality of the workpiece produced by the tool, so that not only improved workpieces are produced by the filter device according to the invention but also the rate of defective workpieces is reduced. Due to the compactness of the filter device according to the invention can be installed in the context of a retrofit kit in any conventional fluid filtration device.
  • the detection device is designed such that the detection device detects such a measured value as the actual value of the working parameter of the fluid, which also changes when the degree of contamination of the filter is changed changes.
  • the detection device provided in the filter device according to the invention is designed such that it detects the pressure, the flow rate, the flow rate, the temperature and / or the viscosity of the fluid as the actual value of the working parameter of the fluid.
  • a preferred embodiment of the invention Filterein ⁇ direction provides that the filter device associated detection device each having a pressure sensor for detecting the fluid pressure upstream or downstream or upstream and downstream of the filter device, wherein in the first mentioned In both cases, in which the fluid pressure is detected upstream or downstream of the filter device, a pressure and in the latter case (upstream and downstream), a differential pressure is measured. Deswei ⁇ n the detection device is designed so that the thus detected as working parameters of the fluid pressure-actual value or the differential pressure-actual value with the predetermined, ie adjustable, desired pressure value or differential pressure target value is compared and that as soon as the actual value exceeds the setpoint value, a manipulated variable is generated, which causes an increase in the ⁇ réellesgra ⁇ of the throttle.
  • This embodiment of the filter device according to the invention has the decisive advantage that in this way the pressure upstream of the filter device can be kept constant in a particularly simple and reproducible manner, as an additional advantage of this embodiment of the filter device according to the invention
  • pressure sensor are inexpensive and are characterized by a low maintenance and störunan réellee Meltion.
  • Another embodiment of the inventive filter device has such a detection device which is provided with at least one temperature sensor for detecting the fluid temperature upstream and / or downstream of the filter device or for detecting a differential temperature.
  • the temperature actual value of the fluid or the difference temperature actual value detected thereby is compared in the detection device with the predeterminable temperature set value or predefinable difference temperature set value, so that as soon as the actual value Value exceeds the setpoint value, a manipulated variable is generated by the detection device, which causes an increase in the opening degree of the throttle.
  • This embodiment of the filter device according to the invention is preferably used when a low-viscosity polymeric melt is to be filtered with the filter device according to the invention.
  • a particularly advantageous development of the filter device according to the invention provides that in this case the throttle is arranged upstream of the filter device between the first closure element and the filter.
  • This embodiment is always preferably used when the fluid to be filtered has only a relatively low degree of contamination, so that in this case there is no risk that the functioning of the throttle is affected by deposited dirt particles.
  • the throttle which is arranged upstream of the filter device, assigns a valve or this valve is formed integrally with the throttle, whereby this valve in its open position directs a fluid flow towards the atmosphere derives.
  • This embodiment of the filter device according to the invention is preferably always used when the fluid to be filtered in each case, in particular the polymer melt to be filtered, tends to form particulate agglomerates even during short standstill times. These particulate agglomerates can then be removed by means of the valve at the beginning of the filtration of the fluid, so that these agglomerates do not contaminate the filter even then.
  • Another embodiment of the filter device according to the invention provides that in this case the throttle is arranged downstream of the filter device.
  • This embodiment of the erfindungsge ⁇ MAESSEN filter device is always applied when the fluid to be filtered is heavily contaminated, the additional advantage of such an arrangement of the throttle is seen in the fact that the throttle provided downstream of the filter device does not come into contact with contaminated fluid.
  • this embodiment of the filter device according to the invention is characterized by a high level of operational reliability, so that it is preferably also used for the filtration of polymeric recycled material melt.
  • a particularly fine tuning of the degree of throttling of the fluid flow is achieved in the filter device according to the invention characterized in that upstream and downstream of the filter in each case a throttle is provided.
  • the designation upstream of the filter determines a position which lies between the first connection element and the filter
  • the designation downstream of the filter determines a position which lies between the filter and the second connection element
  • throttle provided in the filter device according to the invention in the fluid flow is generally noted that this throttle is designed so that their degree of opening within half confine narrow limits and that further the throttle is designed so that dead spaces are minimized.
  • a particularly störunan thirteene embodiment of the erfindungsge ⁇ MAESSEN filter device has a throttle, which is provided with a through-flow of the fluid receiving space.
  • This receiving space is preferably a pipe section through which the fluid flows, this receiving chamber having a throttle element penetrating into the fluid.
  • the throttle element is • between a first position in which the fluid flow is almost interrupted, so that there is a low ⁇ ff ⁇ tion of the throttle, and a second position in which the fluid flow through the throttle element is not or almost not hindered , So that there is a high degree of opening of the throttle, and vice versa, movable.
  • the throttle element is designed as a flat slide and associated with a pipe section through which the fluid flows, so that the degree of opening of the throttle can be adjusted by a movement of this flat slide.
  • a further development of the above-described embodiment of the filter device according to the invention provides a throttle, in which the throttle element is designed as a cylindrical throttle piston and the receiving space as a cylindrical receiving space, wherein the flow of fluid is passed through this cylindrical Auf ⁇ receiving space.
  • the cylindrical throttle piston is axially displaceably mounted in the cylindrical receiving space between the previously described first position and the second position, so that the degree of opening of the throttle can be changed as desired by an axial displacement of the cylindric throttle element.
  • the cylindrical receiving space and a pipe section through which the fluid is guided serve as a receiving space
  • said pipe section then has a correspondingly shaped housing portion for guiding and holding the cylindrical throttle element.
  • the throttle element In the case of an axial displacement of the cylindrical throttle element, the diameter of which is greater than the cross section of the pipe section, the throttle element then penetrates into the structure formed as a pipe section. and then causes, depending on its penetration depth, the desired throttling of the fluid flow.
  • a cylindrical throttle element which is provided with a passage opening corresponding to the cross section of the pipe section, preferably a cylindrical throughbore, wherein this throttle is mounted in a housing section such that an axial displacement of the housing cylindrical throttle element, the passage opening provided therein more or less fluch ⁇ with the pipe inner wall, whereby the degree of opening of the throttle is particularly easy and accurate adjustable.
  • the filter device has a specially shaped throttle, whereby this throttle is distinguished by the fact that it completely avoids flow dead zones.
  • the throttle has a conical receiving space, wherein within this receiving space a thereto adapted, also conical ausgestaltetes throttle element is arranged.
  • the conical throttle element is axially displaceable between the first position and the second position, wherein a fluid supply subchannel arranged upstream of the throttle element and a fluid discharge subchannel provided downstream of the throttle element are assigned to the receiving space. The flow of the fluid in the receiving space and via the fluid discharge subchannel is removed from the receiving space via the fluid supply sub-channel.
  • the fluid removal part passage has a first section, viewed in the flow direction of the fluid, which On both sides of the housing of the receiving space runs outside the same and which opens into the fluid discharge part channel, the previously mentioned advantages are achieved to a particularly high degree by a choke designed in this way.
  • the first portion of the Fluidabschreibteilkanals seen in the flow direction of the fluid as an annular channel remplibil ⁇ det, the annular channel partially or completely enclosing the housing of the receiving space from the outside, as will be explained below with reference to a specific embodiment.
  • the fluid supply partial passage is preferably then provided with the first connection element and the fluid discharge part passage with the second connection element.
  • the throttle element of the embodiment described above is moved depending on the manipulated variable generated by the detection device.
  • This movement which preferably represents an axial displacement of the throttle element, can be brought about either manually or preferably automatically, with a drive for the axial movement of the throttle element being assigned to it for the throttle element.
  • This drive is designed in particular as a hydraulic, pneumatic or electric drive.
  • a further development of the previously described embodiment of the filter device according to the invention provides that the throttle element is moved only over a predetermined size and is preferably displaced axially.
  • This predetermined size is between the first and second position of the throttle element, so that accordingly increases the degree of opening of the throttle or is reduced.
  • an optical and / or acoustic signal is generated, so that upon occurrence of this signal, the operating personnel are shown that a filter change is required.
  • a further embodiment of the previously described embodiment of the filter device according to the invention provides that rewinding of a contaminated filter is automatically triggered when the predetermined size is exceeded.
  • this embodiment of the inventive filter device requires at least two filters, these two filters optionally having a first position in which they both filter the fluid flow and a second position in which one filter filters the fluid flow while the other one Filter with a partial flow of filtered fluid opposite to the flow direction during filtration is backwashed, are movable.
  • the partial flow of filtered fluid then dissolves the contaminants accumulated on the filter surface and, opposite to the flow direction of the fluid during filtration, delivers it to the atmosphere via a suitable valve upstream of the filter, so that after completion of this backwashing process, a contaminant is released Filter for the re-filtration is provided again.
  • the filter device according to the invention can be configured as is known, in which case, for example, the bandpass filters described in the prior art can be designated.
  • the filter device according to the invention is designed such that it has at least two filters arranged at an axial distance from one another within a bolt mounted in a housing and axially displaceable for this purpose.
  • the at least two filters can then be flowed through with the fluid to be filtered or at least one filter is flowed through by the fluid to be filtered, while at the same time the at least one other filter is in a position outside the housing, so that this one, outside the housing located Fil ⁇ ter manually replaced by the respective operating personnel and cleaned or replaced and replaced by a new filter er ⁇ can be.
  • Another, likewise advantageous embodiment of the inventive filter device comprises two, within a Ge housing arranged and axially displaceable for this purpose bolts, which are each provided with at least two, with axial distance from one another an ⁇ arranged filter.
  • these bolts are mounted in corresponding housing bores fluid-tight and axially displaceable bar, wherein optionally all filters are flowed through by the fluid to be filtered or at least one filter is in a position outside the housing, while the remaining other filter of the filtered Flow through the fluid.
  • FIG. 1 shows a schematic perspective view of the filter device according to the invention
  • FIG. 2 as in FIG. 1, but partly with a housing portion broken out
  • FIG. 3 as in FIG. 1, but partly with another larger housing area broken away
  • FIG. 2 as in FIG. 1, but partly with a housing portion broken out
  • FIG. 3 as in FIG. 1, but partly with another larger housing area broken away
  • FIG. 2 as in FIG. 1, but partly with a housing portion broken out
  • FIG. 3 as in FIG. 1, but partly with another larger housing area broken away
  • FIG. 4 shows a schematic sectional view of a throttle, the throttle element being depicted in its second position (opened),
  • FIG. 5 as in FIG. 4, but in a partially opened position of the throttle element
  • FIGS. 1 to 6 the same parts are provided with the same reference numerals.
  • FIGS. 1 to 3 of the filter device denoted overall by 1 has a fluid supply channel 3, whereby this fluid supply channel 3 extends from a first connection element 2 to a first filter 8 or 8a and a second filter 9 or 9a (FIGS. 2 and 3).
  • the filter device 1 is provided with a housing 10 which comprises two mutually parallel bores 12 and 13, the two parallel aligned bolts 6 and 7 store fluid-tight and axially displaceable.
  • each bolt is provided with at least two filters 8 or 8a and 9 or 9a arranged at an axial distance from each other, the respective second filter 8a and 9a being indicated schematically only as a filter 8a in FIG.
  • the filters are adjoined by a fluid discharge channel (not shown), this fluid discharge channel being connected to a tool, not shown, via a second connecting element (not shown).
  • Both the fluid supply channel and the fluid discharge channel have a channel division, as can be seen for the fluid supply channel 3 in FIG. 2 with FIGS. 3a and 3b. This ensures that the Filter 8, 8a, 9 and 9a are supplied evenly with the fluid to be filtered.
  • the filter device 1 is further assigned a detection device 11, which is indicated only schematically in FIGS. 1 to 3.
  • This detection device 11 is associated with two pressure sensors 14 and 15, wherein the pressure sensor 14 upstream of a throttle 5 and the pressure sensor 15 downstream of the filter 8, 8a, 9 and 9a in the fluid discharge channel (not shown) posi ⁇ tioned.
  • a throttle 5 provided in the fluid supply channel has a throttle element 4 which can be displaced axially relative to the flow direction of the fluid in the fluid supply channel, wherein FIGS. 2 and 3 reflect different positions of the throttle element 4.
  • the receiving space 17 of the throttle element 4 is formed in the embodiment of the throttle 5 shown in Figures 1 to 3 by a portion of the fluid supply channel 3.
  • the throttle element 4 is designed as a cylindrical throttle element and has a diameter in its diameter to the inner cross section of the fluid supply channel 3 adapted passage opening 18 ( Figure 2 and 3), so that by an axial displacement of Drosselelemen ⁇ tes 4 relative to the receiving space 17, the opening degree of the throttle is arbitrarily changeable.
  • the filter device 1 is connected via the first connecting element 2, for example with an extruder, not shown, and via the second connecting element with a tool, also not shown.
  • the above filter device 1 operates as follows:
  • the fluid to be filtered is supplied in the direction of arrow 16 via the fluid supply channel 3 to the two filters 8 and 9, filtered there and then passes as a filtered fluid through the adjoining fluid discharge channel to the not darge presented tool.
  • a differential pressure is measured via the two Meß ⁇ sensors 14 and 15, wherein the size of this differential pressure via the throttle 5 is adjustable.
  • a pressure of the fluid to be filtered which is generally designated beforehand as the actual value of the working parameter of the fluid, is set on the measuring sensor 14. Furthermore, a further pressure is measured at the sensor 15, wherein the differential pressure detected from the two pressures is then compared in the detection device 11 with a predetermined differential pressure desired value.
  • the filter 9 or the filters 8a and 9a can be exchanged in an analogous manner, with the bolts 8 or the bolt 9 being displaced axially to the right for replacement of the filters 8a and 9a until they are positioned outside the housing of the filter device 1.
  • the throttle 5 shown further in FIGS. 4 to 6 differs in the throttle previously described in connection with FIGS. 1 to 3 in that the throttle according to FIGS. 4 to 6 is configured differently.
  • the throttle 5 depicted in FIGS. 4 to 6 has a conically shaped throttle element 4, which is arranged within a conically shaped receiving space 17, wherein the FIG. 4 shows the throttle element 4 in its maximum opening position, FIG Throttle element 4 in its central opening position and the figure 6 shows the throttle element 4 in a closed position senen.
  • the throttle 5 is flowed through in the flow direction 16 by the fluid.
  • the throttle 5 has a fluid supply sub-channel 19 arranged upstream of the throttle element 4, which on the one hand is connected to the (not shown) fluid supply channel 3 and which, on the other hand, opens into the receiving space 17.
  • the fluid Downstream of the throttle element 4, in the open position of the throttle element, as shown in FIGS. 4 and 5, the fluid is guided laterally past the throttling element 4 between the outer wall of the conical throttle element 4 and the inner wall of the receiving space 17 then into a fluid discharge part passage 20, wherein a first portion 21 of the Fluidab- supply part channel is formed as an annular space.
  • the flow conditions in the annulus can be optimally configured by means of a throttle formed in this way. so that unwanted dead zones are avoided here.
  • Throttle 5 changes.

Landscapes

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

Abstract

L'invention concerne deux procédés pour filtrer un fluide ainsi qu'un dispositif et une unité de filtrage pour la mise en oeuvre de ces procédés. Selon l'invention, le fluide à filtrer est acheminé à travers au moins un filtre (8), l'écoulement du fluide étant restreint (5). Au moins une valeur réelle d'un paramètre de travail du fluide est mesurée (11) puis comparée à une valeur prescrite pouvant être prédéfinie. Au moins une grandeur de régulation est produite en fonction d'au moins un écart entre la valeur réelle et la valeur prescrite. Le degré de la restriction d'écoulement (5) est modifié en fonction de cette grandeur de régulation.
EP05773579A 2004-08-19 2005-08-08 Procedes pour filtrer un fluide et dispositif et unite de filtrage pour mettre en oeuvre lesdits procedes Withdrawn EP1663443A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004040389 2004-08-19
PCT/DE2005/001400 WO2006018006A1 (fr) 2004-08-19 2005-08-08 Procedes pour filtrer un fluide et dispositif et unite de filtrage pour mettre en oeuvre lesdits procedes

Publications (1)

Publication Number Publication Date
EP1663443A1 true EP1663443A1 (fr) 2006-06-07

Family

ID=35107072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05773579A Withdrawn EP1663443A1 (fr) 2004-08-19 2005-08-08 Procedes pour filtrer un fluide et dispositif et unite de filtrage pour mettre en oeuvre lesdits procedes

Country Status (3)

Country Link
US (1) US20080217255A1 (fr)
EP (1) EP1663443A1 (fr)
WO (1) WO2006018006A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102166448B (zh) * 2011-03-10 2012-11-28 温州宇丰化纤机械有限公司 全自动熔体过滤器
DE102012006563B3 (de) * 2012-03-30 2013-05-16 Maag Pump Systems Gmbh Vorrichtung zum Filtrieren eines Fluids
CN105082511A (zh) * 2015-07-21 2015-11-25 浙江绿宇环保有限公司 反冲式洗网换网器
EP3308940B1 (fr) * 2016-10-17 2025-03-05 Next Generation Analytics GmbH Système de filtre pour les fluides visqueux ou fortement visqueux, surtout plastique fondu et procédé de filtration des liquides visqueux ou fortement visqueux
DE102017115295B3 (de) * 2017-07-07 2018-10-25 Nordson Corporation Filtriervorrichtung und Verfahren zum Betreiben derselben
CN107940072A (zh) * 2017-11-30 2018-04-20 山东奇威特太阳能科技有限公司 高压节流流量调节装置
PL3960422T3 (pl) * 2020-09-01 2023-02-27 Fimic S.R.L. Urządzenie do ciągłej filtracji stopionego tworzywa sztucznego

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US3608001A (en) * 1969-08-26 1971-09-21 Exxon Research Engineering Co Controlled degradation of polypropylene in extruder-reactor
US3647344A (en) * 1970-03-16 1972-03-07 Monsanto Co Apparatus for controlling back pressure in an extruder
US3841147A (en) * 1973-02-05 1974-10-15 Eastman Kodak Co Method and apparatus for determining the inherent viscosity of a liquid
DE2751225C3 (de) * 1977-11-16 1981-08-13 Werner & Pfleiderer, 7000 Stuttgart Vorrichtung mit einer nach dem Siebpaket eines Schneckenextruders angeordneten Schmelzindex-Meßeinrichtung und Verfahren zum Regeln der Viskosität von aufgeschmolzenem und auszuformendem Kunststoff
US4701118A (en) * 1985-07-03 1987-10-20 Kreyenborg Verwaltungen Und Beteiligungen Kg Apparatus for filtering plasticized materials in extruders
DE3780537T2 (de) * 1986-02-10 1993-03-04 Austral Pacific Resource Drosseleinrichtung fuer ein ventil.
US4814186A (en) * 1988-02-29 1989-03-21 Beringer Co., Inc. Polymer filtration apparatus
DE9105000U1 (de) * 1991-04-23 1991-08-01 Trendelkamp, Josef, 4418 Nordwalde Siebwechselkassette
ATE135283T1 (de) * 1992-05-11 1996-03-15 Gneuss Kunststofftechnik Gmbh Filter für kunststoffschmelzen
GB9317889D0 (en) * 1993-08-27 1993-10-13 Vortoil Separation Systems Ltd Fluid control
JPH07186242A (ja) * 1993-12-27 1995-07-25 Japan Steel Works Ltd:The スクリーンパック交換装置
US5858420A (en) * 1997-08-13 1999-01-12 Husky Injection Molding Systems Ltd. Flow regulating and distributing assembly
US6422852B1 (en) * 1998-04-30 2002-07-23 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Filter device for extruders and injection moulding machines
DE29908735U1 (de) * 1999-05-18 1999-09-02 KoSa GmbH & Co. KG, 60528 Frankfurt Filtereinrichtung für die Reinigung von Kunststoffschmelzen
WO2004026432A1 (fr) * 2002-09-17 2004-04-01 Kreyenborg Verwaltungen Und Beteiligungen Gmbh & Co. Kg Dispositif pour filtrer un fluide, notamment dans des installations de transformation de matieres plastiques
US6971865B2 (en) * 2002-12-11 2005-12-06 Guill Tool & Engineering Co., Inc. Manifold for regulating the flow of plastic to an extrusion die

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006018006A1 *

Also Published As

Publication number Publication date
US20080217255A1 (en) 2008-09-11
WO2006018006A1 (fr) 2006-02-23

Similar Documents

Publication Publication Date Title
DE202016103608U1 (de) Filtervorrichtung und Reinigungseinrichtung zum Entfernen von Schmutzpartikeln von einem Filterelement einer Filtervorrichtung Filtervorrichtung und Reinigungseinrichtung zum Entfernen von Schmutzpartikeln von einem Filterelement einer Filtervorrichtung
EP2121282A1 (fr) Dispositif pour le filtrage d'un fluide, en particulier pour des installations de transformation des matières plastiques
EP3259109A2 (fr) Dispositif et procede de filtration
EP0433587A2 (fr) Dispositif de remplacement de tamis cylindrique
WO2011151398A1 (fr) Dispositif filtrant pour milieux hautement visqueux
DE202010017247U1 (de) Vorrichtung zum Filtrieren eines Fluids
EP1663443A1 (fr) Procedes pour filtrer un fluide et dispositif et unite de filtrage pour mettre en oeuvre lesdits procedes
EP2756874B1 (fr) Dispositif de filtre
DE10349642A1 (de) Vorrichtung zur Aerosolerzeugung und Injektoreinheit
DE102009012444A1 (de) Vorrichtung und Verfahren zum Filtern einer Flüssigkeit
DE102005037268A1 (de) Verfahren zum Filtrieren eines Fluids sowie Vorrichtung und Filtereinrichtung zur Durchführung des Verfahrens
EP1778379B1 (fr) Dispositif et procede de filtration d'un fluide destines en particulier a des installations de transformation des plastiques
WO2018184722A1 (fr) Dispositif filtrant pour un fluide
DE102022106334A1 (de) Filtriervorrichtung zum Filtrieren eines Fluids sowie betreffendes Betriebsverfahren
DE202004020442U1 (de) Vorrichtung zum Filtrieren eines Fluids
DE4406549A1 (de) Verfahren zum Reinigen von polymeren Kunststoffen und Vorrichtung zur Ausübung des Verfahrens
EP0875357B1 (fr) Filtre pour extrudeuses et presses d'injection
DE2130501A1 (de) Vorrichtung zum Auswechseln von Sieben
DE102010025163A1 (de) Vorrichtung zum Filtrieren eines Fluids
DE10356711A1 (de) Bandsiebwechsler
DE19730574C1 (de) Filtereinrichtung für Strangpressen und Spritzgießmaschinen
EP3393752A1 (fr) Extrudeuse avec plaque perforée coulissante
DE102022124308A1 (de) Filtriervorrichtung zum Filtrieren eines Fluids sowie betreffendes Entlüftungs- und Rückspülverfahren
DE102004012617A1 (de) Vorrichtung zum Filtrieren eines Fluids, insbesondere zum Filtrieren eines verflüssigten Kunststoffes
WO2014184220A1 (fr) Filtre de matière en fusion avec dispositif d'entraînement pour un prédrainage actif

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20051126

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

17Q First examination report despatched

Effective date: 20060731

RBV Designated contracting states (corrected)

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100622