EP3927519A1 - Verfahren und vorrichtung zum filtern einer polymerschmelze - Google Patents
Verfahren und vorrichtung zum filtern einer polymerschmelzeInfo
- Publication number
- EP3927519A1 EP3927519A1 EP20705325.7A EP20705325A EP3927519A1 EP 3927519 A1 EP3927519 A1 EP 3927519A1 EP 20705325 A EP20705325 A EP 20705325A EP 3927519 A1 EP3927519 A1 EP 3927519A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- polymer melt
- melt
- filter element
- chamber
- 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
- 229920000642 polymer Polymers 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001914 filtration Methods 0.000 title claims abstract description 24
- 239000000155 melt Substances 0.000 claims description 38
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 239000012298 atmosphere Substances 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000001704 evaporation Methods 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 description 7
- 238000011161 development Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 6
- 239000000470 constituent Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
- B29C48/694—Cylindrical or conical 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
- B29C48/27—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
- B29C48/76—Venting, drying means; Degassing means
- B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
Definitions
- the invention relates to a method for filtering a polymer melt according to the preamble of claim 1 and a device for filtering a polymer melt according to the preamble of claim 8.
- a generic method and a generic device are known for example from DE 199 12 433 A1.
- the polymer melt When processing thermoplastics, it is common practice that the polymer melt has to be freed of foreign bodies within an extrusion process, for example for the manufacture of strand-like products, and is therefore filtered.
- the polymer melt In the known Ver drive and in the known device, the polymer melt is passed through a filter element.
- the filter element is arranged in a housing and forms a pressure chamber on an outer inlet side and a filter chamber on an inner outlet side of the filter element.
- the polymer melt is fed into the pressure chamber with an overpressure through a lower melt inlet and out of the filter chamber via an upper melt outlet.
- the foreign particles can be filtered out of the polymer melt by the filter element.
- this object is achieved by a method with the characteristics of claim 1 and by a device with the features of claim 8.
- the invention is based on the knowledge that when a polymer melt is kept in the environment, volatile constituents evaporate automatically, and this evaporates continuously during the molten phase of the polymer melt.
- the polymer melt is passed from the inner running side to the outer outlet side of the filter element, with an ambient pressure set within the filter chamber and the polymer melt is discharged from the filter chamber without pressure.
- the filter element between the inner inlet side and the outer outlet side is designed to be pressure-stable, the filter chamber being connected to the environment through at least one atmosphere opening in the housing for setting an ambient pressure.
- the pressure stability of the filter element enables high differential pressures between an operating pressure within the pressure chamber and the ambient pressure in the filter chamber to be realized.
- the method variant is provided in which the polymer melt is guided inside the filter chamber on the outflow side of the filter element. So, depending on the shape of the filter element, relatively large melt surfaces can be realized within the filter chamber, which promote the evaporation of the volatile foreign matter. In addition, the melt surface of the polymer melt on the outlet side of the filter element is constantly renewed via the flow on the filter element.
- the volatile gases and vapors emerging from the polymer melt are continuously discharged through an atmosphere opening in the filter chamber. This ensures separation of materials and the vapors released can be captured separately.
- the method variant is preferably carried out in which a nitrogen is used to fog the polymer melt through the opening into the atmosphere Filter chamber is initiated. In this way, chemical reactions on the surface of the polymer melt can advantageously be avoided.
- the filtered polymer melt is collected in a sump of the filter chamber formed below the filter element and leads to through the melt outlet.
- a continuous melt flow can be realized that can be fed to an extrasion process.
- the polymer melt can be routed naturally via the outlet side of the filter element to the sump below.
- the polymer melt is introduced via a melt inlet into a pressure chamber delimited by the filter element with an overpressure in the range between 50 bar and 500 bar.
- the polymer melt can thus be advantageously filtered in any known extrasion process.
- the polymer melt is filtered with a filter fineness of the filter element in the range from 10 ⁇ m to 1000 ⁇ m.
- a filter fineness of the filter element in the range from 10 ⁇ m to 1000 ⁇ m.
- a relatively high filter fineness is required in order to avoid filament breakage.
- the development of the device according to the invention is used before given, in which the filter element between the inlet side and the outlet side has the pressure stability of a differential pressure of 50 bar to 500 bar .
- the development of the device according to the invention is used, in which the filter chamber is connected to a collecting container for gases and vapors via the atmosphere opening. This ensures that vapors and gases are captured and removed from the environment.
- the further development of the device according to the invention is particularly advantageous in which a sump is formed below the filter element in a bottom area of the filter chamber and is connected to the melt outlet in the housing.
- the polymer melt can initially be collected in the sump and then continuously removed.
- the filter element has a filter fineness in the range from 10 ⁇ m to 1000 mth.
- the filter fineness depends on the manufacturing process or the product to be manufactured.
- the device according to the invention In order to avoid chemical reactions on the surface of the polymer melt within the filter chamber, the further development of the device according to the invention is provided, in which the atmosphere opening in the housing is connected to a nitrogen supply device. In this way, the influence of oxygen on the polymer melt can be avoided.
- the surface of the polymer melt is shielded by a nitrogen curtain within the filter chamber.
- the method according to the invention and the device according to the invention are suitable for all extrusion processes in which a polymer melt is processed. In particular, however, polymer melts can also be filtered from a recycling process.
- FIG. 1 schematically shows a cross-sectional view of a first exemplary embodiment of the device according to the invention for filtering a polymer melt
- Fig. 2 schematically shows a cross-sectional view of a further embodiment example of the device according to the invention for filtering a polymer melt
- Fig. 3 schematically shows a cross-sectional view of a further embodiment example of the device according to the invention for filtering a polymer melt
- a first embodiment of the device according to the invention for filtering a polymer melt is shown schematically in a cross-sectional view.
- the exemplary embodiment has a housing 1, which in this example is formed by a cylindrical housing container 1.1 and a housing cover 1.2.
- a filter element 4 in the form of a filter candle is held on an underside of the housing cover 1.2.
- the filter candle 5 is pressure-tight for this purpose via an adapter not shown here coupled to the housing cover 1.2 and protrudes into the interior of the housing container 1.1.
- a pressure chamber 6 is formed which is connected to a melt inlet 7 formed in the housing cover 1.2.
- a filter chamber 2 is formed by the housing container 1.1.
- the filter chamber 2 extends concentrically to the filter candle 5 up to a container bottom in wel chem a sump 8 is formed.
- the sump 8 in the lower region of the Fil terhunt 2 is ver connected to a melt outlet 9 in the housing container 1.1.
- the filter chamber 2 is connected to the environment via an atmosphere opening 3.
- the atmosphere opening 3 is formed on the housing cover 1.2 and penetrates the housing cover 1.2 up to the filter chamber 2 as shown.
- the filter candle 5 has a closed wall inside the filter chamber 2 which is delimited on the inside by a filter material 5.1.
- the filter material 5.1 forms an inlet side 19 of the filter element 4.
- the filter material 5.1 is supported on an outer support wall 5.2.
- the support wall 5.2 has a plurality of Ausittsöff openings 5.3 distributed over an exit surface.
- the support wall 5.2 forms an outer outlet side 20 of the filter element 4.
- a heating device 10 is net angeord.
- the heating device 10 preferably has electrical heating means, which are not shown in detail here.
- a pressure source 11 is connected to the melt inlet 7.
- the pressure source 11 is a melt pump shown.
- the melt pump 11 conveys a polymer melt via the melt inlet 7 into the pressure chamber 6.
- FIG. 1 shows the
- an operating pressure is set, for example in the range from 50 bar to 500 bar.
- the operating pressure is identified in Fig. 1 by the reference number p ß ge.
- the filter element 4 is therefore designed to be pressure-stable between the inlet side 19 and the outlet side 20.
- the support wall 5.2 of the filter candle 5 thus acts as a pressure vessel in order to withstand the respectively set operating pressure in the pressure chamber 6.
- melt jacket 21 on the circumference of the filter candle 5 on the outlet side 20.
- the polymer melt in the melt jacket 21 flows along the filter candle 5 into the lower region of the filter chamber 2 and is collected there in the sump 8.
- the filter chamber 2 is tempered by the heating device 10, so that the polymer melt evaporates into the melt jacket 21.
- Volatile constituents such as gases in the form of monomers or oligomers emerge from the polymer melt in vapor form and are taken up in the filter chamber 2 and discharged into the environment via the atmosphere opening 3.
- the polymer melt from the sump 8 is continuous via the melt outlet promoted out.
- a discharge pump 12 is connected to the melt outlet 9.
- the polymer melt in addition to the filtration range of the polymer melt, a direct evaporation of volatile constituents is subsequently made possible in an atmosphere rack.
- the polymer melt is filtered with a filter fineness in the range from 40 ⁇ m to 1000 ⁇ m.
- the flow properties of the polymer melt are ensured in particular by the heating device 10.
- the polymer melt is preferred to one
- the method according to the invention and the device according to the invention are basically suitable for all thermoplastic melts. Due to the continuous melt flow, the combined filtration and evaporation of the polymer melt is possible in short residence times.
- a further exemplary embodiment of the device according to the invention for filtering a polymer melt is shown schematically in a cross-sectional view.
- Thetientsangsbei game is essentially identical to the aforementionedParksangsbei game according to FIG. 1, so that only the differences are explained at this point and otherwise reference is made to the aforementioned description.
- filter elements 4 are provided, which are held in a cantilever manner on a housing cover 1.2 and penetrate into a filter chamber 2 formed by a housing container 1.1.
- the filter elements 4 are here also gebil det by filter candles 5, which are identical to the aforementioned embodiment sbeispiel in their structure of the filter wall.
- the number of filter candles 5 is in play. In principle, a large number of filter candles in the range from 100 to 150 pieces can be used to filter a polymer melt.
- the filter candles 5 form inside a pressure chamber 6 which is connected to the melt inlet 7 in the housing cover 1.2.
- the filter candles 5 protrude with their outlet sides 20 into the filter chamber 2, the free ends of the filter candles 5 ending above a sump 8 formed in the housing container 1.1.
- the sump 8 is coupled to a discharge pump 12 via the melt outlet 9.
- the upper area of the filter chamber 2 is connected to the surroundings via an atmosphere opening 3.
- the atmosphere opening 3 is formed in a wall of the housing container 1.1.
- a nitrogen supply device 13 is also connected to the atmosphere opening 3. Via the nitrogen supply device 13, nitrogen can be fed into the filter chamber 2 in order to pass a nitrogen veil to the melt jackets produced on the outlet sides 20 of the filter candles 5. This makes it possible, in particular, to prevent chemical reactions caused by the action of the ambient air on the surface of the polymer melt.
- a pressure source 11 is connected to the melt inlet 7.
- an extruder is shown as the pressure source 11.
- the extruded polymer melt can thus be introduced directly into the pressure chamber 6 of the filter candles 5 via the melt inlet 7.
- the function of filtering and evaporating the polymer melt is identical to the aforementioned exemplary embodiment, so that only the differences are explained at this point.
- a nitrogen atmosphere is created inside the filter chamber 2 via the nitrogen supply device 13, so that chemical reactions of the melt, in particular with the oxygen, are avoided. At the same time, however, vapors and gases produced can be led out of the filter chamber 2 via the Atmospheric opening 3.
- An environmental rack pu is set in the filter chamber 2 here. In contrast, there is an operating pressure p ß in the pressure chamber 6.
- the polymer melt flowing off from the filter candles 5 due to gravity is collected in the sump 8 at the bottom of the housing container 1.1.
- the polymer melt is removed from the sump 8 by a discharge pump 12 via the melt outlet 9 and, for example, fed to an extrasion process.
- the outlet sides 20 held ready by the filter elements 4 are always larger than an inlet side 19 used for filtering.
- the polymer melt on the filter candles 5 is pressed inside out, with the outlet sides 20 at the beginning of the Filter candles 5 generate the melt surfaces for the evaporation of vapors and gases.
- other filter elements are also suitable as filter candles in order to be able to carry out a combined filtration and vaporization.
- 3 shows a further exemplary embodiment in which the filter elements are formed by filter disks.
- a further embodiment of the device according to the invention is shown schematically in a cross-sectional view, the embodiment shown in Fig. 3 has a housing 1 in which a filter chamber 2 is formed.
- the filter chamber 2 is connected to the surroundings and a collecting container 17 via an atmosphere opening 3.
- a suction fan 18 is assigned to the collecting container 17.
- a plurality of filter elements 4 is arranged on.
- the filter elements 4 are formed by filter disks 14 which are held on the circumference of a mounting dome 15.
- the receiving dome 15 forms a melt channel 15.1 in the interior, which is connected via a plurality of distribution openings 15.2 to a respective pressure chamber 6 of the filter disks 14.
- the receiving dome 15 penetrates the housing 1 to the outside and forms a melt inlet 7 at one open end.
- a sump 8 is formed below the vertically oriented Fil terusionn 14.
- the sump 8 is funnel-shaped and connected to a lower melt outlet 9 in the housing 1.
- the melt outlet 9 and the atmosphere opening 3 are opposite one another in the filter chamber.
- the filter disks 15 are designed in such a way that they have a pressure stability between an inner inlet side 19 and an outer outlet side 20 in order, for example, to achieve an operating pressure within the pressure space 6 of max. To withstand 500 bar. In contrast, an ambient pressure pu is set in the filter chamber 2.
- the melt inlet 7 can be connected directly to an extruder as a pressure source 11.
- the polymer melt will lead via the melt channel 15.1 and the distribution openings 15.2 of the receiving dome 15 into the pressure spaces 6 of the filter disks 15.
- the filter discs 15 have a filter material in order to filter the foreign particles from the polymer melt.
- the filter material can have a filter fineness in the range from 40 mth to 1000 mth.
- the polymer melt After the polymer melt has passed through the filter material on the filter disk 15, the polymer melt reaches the outer sides of the filter disks 15, with a melt jacket forming on each filter disk within the filter chamber.
- the polymer melt can due to its gravity to the sump 8 in the bottom of the housing 1.
- the polymer melt evaporates.
- the escaping vapors and gases are discharged via the atmosphere opening 3 and taken up by the collecting container 17.
- the suction fan 18 is connected to the collecting container 17 and discharges the vapors and gases. This keeps the area around the device free of vapors and gases.
- the polymer melt collected in the sump 8 is then discharged via the discharge extruder 16.
- the Wieneinrich device 10 for temperature control of the housing 1 was not shown in detail.
- the number of filter disks shown is also exemplary. In principle, a larger number of filter disks can also be used to filter the polymer melt.
- the regulations and the choice of filter elements are examples. It is essential here that the filter elements are designed to be pressure-resistant in such a way that a high operating pressure in the interior of the filter elements can be safely maintained in relation to the environment.
- the polymer melt is to be guided within the filter chamber in such a way that free evaporation of the melt is possible.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019001212.7A DE102019001212A1 (de) | 2019-02-19 | 2019-02-19 | Verfahren und Vorrichtung zum Filtern einer Polymerschmelze |
PCT/EP2020/053384 WO2020169398A1 (de) | 2019-02-19 | 2020-02-11 | Verfahren und vorrichtung zum filtern einer polymerschmelze |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3927519A1 true EP3927519A1 (de) | 2021-12-29 |
Family
ID=69591625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20705325.7A Pending EP3927519A1 (de) | 2019-02-19 | 2020-02-11 | Verfahren und vorrichtung zum filtern einer polymerschmelze |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3927519A1 (de) |
CN (1) | CN113439018A (de) |
DE (1) | DE102019001212A1 (de) |
WO (1) | WO2020169398A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113244863B (zh) * | 2021-04-06 | 2022-10-21 | 北京碳垣新材料科技有限公司 | 复合材料的制备设备及其使用方法 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE507627A (de) * | 1950-12-06 | |||
JPS51108382A (en) * | 1975-03-19 | 1976-09-25 | Toyo Boseki | Seikeiyoryutaino renzokurokaho |
DE3403195A1 (de) * | 1984-01-31 | 1985-08-01 | Wolfgang Prof. Dipl.-Ing. 8201 Schechen Zimmermann | Siebschneckenextruder |
DE19912433A1 (de) | 1998-03-20 | 1999-09-23 | Barmag Barmer Maschf | Filtervorrichtung zur Filtration von Kunststoffschmelze |
ATE370830T1 (de) | 2002-09-20 | 2007-09-15 | Basf Ag | Vorrichtung und verfahren zum extrudieren von thermoplasten und verwendung davon. |
UA74926C2 (en) * | 2004-03-16 | 2006-02-15 | Yevhenii Petrovych Barmashyn | Extruder for processing of thermoplastic polymeric materials with area of filtration and degassing |
CN102555102A (zh) * | 2012-01-09 | 2012-07-11 | 佛山市联塑万嘉新卫材有限公司 | 一种塑料熔体长效精密过滤器 |
CN203382860U (zh) * | 2013-08-19 | 2014-01-08 | 温州宇丰化纤机械有限公司 | 逆流式熔体过滤器 |
PL3308941T3 (pl) * | 2016-10-13 | 2022-03-07 | Starlinger & Co. Gesellschaft M.B.H. | Urządzenie i sposób filtrowania stopionych tworzyw sztucznych |
-
2019
- 2019-02-19 DE DE102019001212.7A patent/DE102019001212A1/de active Pending
-
2020
- 2020-02-11 CN CN202080014886.9A patent/CN113439018A/zh active Pending
- 2020-02-11 WO PCT/EP2020/053384 patent/WO2020169398A1/de unknown
- 2020-02-11 EP EP20705325.7A patent/EP3927519A1/de active Pending
Also Published As
Publication number | Publication date |
---|---|
DE102019001212A1 (de) | 2020-08-20 |
CN113439018A (zh) | 2021-09-24 |
WO2020169398A1 (de) | 2020-08-27 |
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