WO2017194194A1 - Method and device for sealing the end side of a membrane tube section for a membrane element - Google Patents

Method and device for sealing the end side of a membrane tube section for a membrane element Download PDF

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Publication number
WO2017194194A1
WO2017194194A1 PCT/EP2017/000670 EP2017000670W WO2017194194A1 WO 2017194194 A1 WO2017194194 A1 WO 2017194194A1 EP 2017000670 W EP2017000670 W EP 2017000670W WO 2017194194 A1 WO2017194194 A1 WO 2017194194A1
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WO
WIPO (PCT)
Prior art keywords
membrane tube
tube section
temperature
heated
membrane
Prior art date
Application number
PCT/EP2017/000670
Other languages
German (de)
French (fr)
Inventor
Michael Späth
Original Assignee
Krallmann Kunststoffverarbeitung 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 Krallmann Kunststoffverarbeitung Gmbh filed Critical Krallmann Kunststoffverarbeitung Gmbh
Publication of WO2017194194A1 publication Critical patent/WO2017194194A1/en

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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
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/10—Closing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/06—Tubular membrane modules
    • B01D63/061—Manufacturing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/003—Membrane bonding or sealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/04—Specific sealing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/08—Fully permeating type; Dead-end filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2323/00—Details relating to membrane preparation
    • B01D2323/42—Details of membrane preparation apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/14—Ultrafiltration; Microfiltration
    • B01D61/147—Microfiltration
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/26—Hot fluid
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91211—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods
    • B29C66/91212—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature with special temperature measurement means or methods involving measurement means being part of the welding jaws, e.g. integrated in the welding jaws
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9121—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature
    • B29C66/91231—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the temperature of the joining tool
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/14—Filters

Definitions

  • the invention relates to a method for the end-side closing of a membrane tube section for a membrane element, in particular a filter membrane element, wherein an end region of the membrane tube section to be sealed is heated and at least fused and sealed.
  • the invention further relates to a device for the end-side sealing of a membrane tube section for a membrane element, in particular a filter membrane element, with a closure device which has a forming surface inside a mold bore for engagement with an end region of the membrane tube section to be closed ,
  • the deposition of particles occurs predominantly on the surface of a porous membrane.
  • the membrane has pores or passages very small
  • a corresponding membrane can also be used to subdivide a fluid flow, for example an air flow, into a multiplicity of individual flows, which, for example, wise when foaming a liquid, especially milk, is advantageous.
  • a fluid flow for example an air flow
  • the membrane is used for microfiltration, the invention is not limited thereto.
  • Tubular membranes are often used in the so-called dynamic microfiltration.
  • a tubular filter membrane element is closed at its one axial end and before or after closing at its opposite axial end with an adapter part
  • Adapter part may be, for example, a connection socket for a fluid line or other, necessary for the use of the Filtermembran- element functional part.
  • the suspension to be filtered can either be introduced into the interior of the tubular filter membrane element, wherein the fluid phase of the suspension flows through the wall of the filter membrane element and in this way is removed while the particles remain in the filter membrane element.
  • the reverse flow is also possible, i. to be filtered suspension is on the outside of the tubular filter membrane element and the fluid phase penetrates the wall of the Filtermembran- element, enters its interior and is discharged there, while the filtered particles remain on the outside of the filter membrane element.
  • a section is separated from an "endless" membrane tube.
  • the membrane tube may, for example, be a tubular plastic tube with small diameter pores and passages.
  • the membrane tube section is closed in its one end region and provided in the other end region with the adapter part. The sealing of the membrane tube section is usually accomplished by manually contacting the membrane tube section with a heated or heated plate by a user, thereby melting or fusing the plastic material and then sealing it by applying low compressive forces.
  • US 2004/0211785 A1 shows a method and a device for closing plastic tubes.
  • a pipe section is heated at its one axial end while turning so far that it is deformable.
  • the heated end of the tube is pressed against or into a chamber of a molded part and thereby closed and rounded.
  • This procedure is very difficult in practice, since the heating of the end portion of the tube must be exactly so that the material of the tube is deformable, but still retains its stability, since it can not otherwise be introduced into the chamber of the molding.
  • the flow rate of a single tubular filter membrane element is due to the very small dimension low, so that it is common practice to combine a plurality of tubular filter membrane elements on a so-called filter ⁇ membrane module together.
  • the membrane tube section of each filter membrane element must be closed manually at one end. This is very time consuming and therefore costly. In addition, it must be ensured that the membrane tube section is reliably closed at its end, so that no short-circuit flow occurs. This requires a complex and expensive quality control.
  • the invention has for its object to provide a method for the end-side closing of a membrane tube ⁇ bitess for a membrane element, in particular a Filtermembran- element with which can be closed reliably and in a simple manner to be closed end portion of the membrane tube ⁇ bitess.
  • a device for the end-side closing of a membrane tube ⁇ bitess for a membrane element, in particular a filter membrane element to be created, which is constructed in a structurally simple manner.
  • the above-mentioned object is achieved by a method having the features of claim 1. It is envisaged that the closing device with the mold bore to a temperature above the
  • Melting temperature of the material of the membrane tube ⁇ bitess is heated and is rotated or pivoted when closing the end portion relative to the membrane tube section.
  • the invention is based on the basic idea that a large part of the incompletely or poorly sealed membrane tube sections is based on the fact that the user causes the end section of the membrane tube section to be closed to be contacted incorrectly or too long with the heated closing device, whereby a burn through of the plastic material can occur. This is inventively avoided in that the heated closing device is rotated when turning the end portion relative to the membrane tube section or pivoted back and forth.
  • the end region of the membrane tube section to be closed is introduced into the mold bore of the closing device.
  • the membrane tube section normally has a circular cylindrical shape.
  • the mold bore may have a circular cylindrical shape, so that the membrane tube section can be inserted into the mold bore with little clearance or tight fit.
  • the inner wall of the mold bore is heated to said temperature above the melting temperature of the material and in particular of the plastic material of the membrane tube section, whereby the material of the membrane tube section is melted at least in the end region to be closed.
  • the end portion to be closed of the membrane tube portion is compressed in the mold bore and thereby closed.
  • the compression of the end region of the membrane tube section to be closed is achieved in a conically tapering section of the mold bore.
  • the conically tapered portion of the mold bore with simultaneous rotation or pivoting of the mold bore relative to the membrane tube section, provides for secure closure of the membrane tube section.
  • the mold bore can also be formed over its entire length with a conically tapering cross-section. The wall of the mold bore stabilizes the membrane tube section during this process and prevents lateral deflection.
  • the membrane tube section is rotatably held during the closing, while the closing device is rotated with the mold bore by means of the drive device, preferably in the form of a servo motor or pivoted back and forth.
  • the temperature of the closing device is preferably maintained within a predetermined temperature range with high accuracy.
  • the temperature to which the sealing device is heated depends on the structure of the membrane tube section and in particular its material, and may for example be in the range of 220 ° C to 250 ° C.
  • the closing device is heated to a temperature of 250 ° C or more and more preferably to 280 ° C or more, and more preferably to a temperature in the range of 280 ° C to 300 ° C.
  • a cleaning mode can be provided.
  • the closing device is heated, at least in the region of the mold bore, to a cleaning temperature of> 300 ° C., whereby plastic particles or plastic residues, which are located at the top of the mold bore, are heated. surface of the closing device and in particular in the interior of the mold bore adhere, are burned.
  • the cleaning temperature can be in the range of 350 ° C to 450 ° C.
  • the above object is achieved by a device having the features of claim 9.
  • at least one heating device is provided, by means of which the closing device with the mold bore can be heated to a temperature above the melting temperature of the material and in particular of the plastic material of the membrane tube section.
  • the mold surface is formed inside the mold bore, wherein the mold bore is formed in a housing of the closing device and the housing is rotatable or pivotable about a rotation axis relative to the membrane tube section by means of a drive device.
  • the membrane tube section is inserted with its end to be closed in the heated, rotating or pivoting mold bore. As a result, the material of the end region is melted and closed by the force exerted by the wall of the mold bore as reaction force compressive forces.
  • the mold bore extends coaxially to the axis of rotation of the housing.
  • the mold bore has an outwardly opening insertion opening and an opposite end portion, which is preferably formed as a conically tapered portion, so that on the end region to be closed of the membrane tube portion when inserted into the mold bore through the wall of the conically tapered portion radially inward pressure forces be applied, which close the end.
  • the mold bore can also be formed over its entire length with a conically tapering cross-section.
  • the housing in which the mold bore is formed is heated and preferably maintained in a predetermined temperature range.
  • the housing may be assigned an outer heating device 1 and / or an inner heating device 2.
  • the outer heating device 1 designates at least one heating element and in particular a resistance heating element, which is arranged on the outside of the housing.
  • the inner second heating device is preferably formed by a channel system in the interior of the housing, which is flowed through by a heated or hot liquid or a gas and in this way heats the housing from the inside out. Alternatively, the inner 2.
  • Heating device also be formed by a heating element and in particular a resistance heating element.
  • At least one temperature sensor is provided, which is connected to a control unit. Due to the data of the temperature sensor, the temperature of the housing and / or the molding surface can be maintained by means of the control unit in a predetermined temperature range.
  • the sealing device can be heated to a temperature of 250 ° C. or more and in particular 280 ° C. or more by means of the heating device 300 ° C is heated.
  • the housing can either completely or at least in the region in which the mold bore is formed, made of ceramic or metal.
  • FIG. 1 shows a section through a device according to the invention for the end-side closing of a membrane tube section for a filter membrane element prior to insertion of the membrane tube section and
  • FIG. 1 shows a section through a device according to the invention for the end-side closing of a membrane tube section for a filter membrane element prior to insertion of the membrane tube section and
  • Fig. 2 shows the device of Figure 1 with inserted and sealed membrane tube section.
  • FIG 1 shows a section through a closing device 10, with which a tubular membrane element, in particular a filter membrane element F is closed for microfiltration.
  • the filter membrane element F has a membrane tube section S made of plastic, which is connected at its one, according to FIG 1 left end with an adapter part A made of plastic, which forms a connection socket for a fluid line.
  • an adapter part A made of plastic which forms a connection socket for a fluid line.
  • right end portion E of the membrane tube section S is still open.
  • the closing device 10 has a preferably made of ceramic housing 11, in which a mold bore 12 is formed, whose inner wall forms a molding surface 25.
  • the mold bore 12 has at its inner end a conically tapered section 13.
  • the axis of rotation L of the housing 11 coincides with the longitudinal axis of the mold bore 12.
  • a first temperature sensor 21 is arranged near the cylindrical wall of the mold bore 12, which is connected via a line 23 to a control unit 17. In the region of the conical section 13 of the mold bore
  • a second temperature sensor 22 is arranged, which is connected via a line 24 to the control unit 17.
  • an outer heater 1 15 is arranged, which may in particular be an electrical resistance heater.
  • an internal second heating device 16 is provided, which may also be either an electrical resistance heater or a channel system in which a heated or hot fluid (liquid or gas) flows.
  • the second heater 16 is connected via a line 20 to the control unit 17.
  • control unit 17 is also connected via a line 19 to the drive device 14.
  • the membrane tube section S is closed with its end region to be closed.
  • rich E introduced into the mold bore 12 of the heated housing 11. This can be done either by axially advancing the membrane tube section and inserting it into the mold bore 12, but alternatively it is also possible to hold the adapter part and the membrane tube section S stationary and move the closing device according to FIG. 1 to the left, so that the membrane tube section S enters the mold bore.
  • the filter membrane element F and thus also the membrane tube section S is pulled out of the mold bore 12 again, wherein it then cools, so that the membrane tube section S is firmly closed.
  • the control unit 17 which controls the first heating device 15 and the second heating device 16 as a function of the detected actual temperatures at the first temperature sensor 21 and the second temperature sensor 22, the temperature of the housing 11 and in particular the Mold bore 12 held in a desired temperature range.
  • the closure device 10 can be operated in a cleaning mode.
  • the first heating device 15 and / or the second heating device 16 are of the
  • Controlled control unit 17 that the temperature in the housing 11 and in particular on the wall of the mold bore 12 is brought to a high value of, for example, about 400 ° C, whereby any adhering plastic residues are burned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The invention relates to the end-side sealing of a membrane tube section for a membrane element, in particular a filter membrane element. According to the invention, an end region of the membrane tube section which is to be sealed is heated and at least melted and brought into contact with a sealing device and sealed. The sealing device with a formed bore is heated to a temperature above the melting temperature of the material of the membrane tube section and when sealing the end region, is rotated or tilted back and forth with respect to the membrane tube section by means of a drive device. A corresponding device comprises a sealing device which can be heated, by means of at least one heating device with a formed bore, to a temperature above the melting point of the material of the membrane tube section and which comprises a forming surface for contacting with an end region of the membrane tube section which is to be sealed. The shaping surface is formed inside a formed bore which is provided in a housing of the sealing device. The housing can be rotated or pivoted about a rotational axis with respect to the membrane tube section by means of a drive device.

Description

Verfahren und Vorrichtung zum endseitigen Verschweißen eines Membran öhrchen-Abschnitts für ein Membran-Element  Method and device for the end-side welding of a membrane tube section for a membrane element
Die Erfindung betrifft ein Verfahren zum endseitigen Verschließen eines Membranröhrchen-Abschnitts für ein Membran- Element, insbesondere ein Filtermembran-Element, wobei ein zu verschließender Endbereich des Membranröhrchen- Abschnitts erwärmt und zumindest angeschmolzen und verschlossen wird. The invention relates to a method for the end-side closing of a membrane tube section for a membrane element, in particular a filter membrane element, wherein an end region of the membrane tube section to be sealed is heated and at least fused and sealed.
Ferner betrifft die Erfindung eine Vorrichtung zum endsei- tigen Verschließen eines Membranröhrchen-Abschnitts für ein Membran-Element, insbesondere ein Filtermembran-Element, mit einer Verschließvorrichtung, die eine Formfläche im Inneren einer Formbohrung zur Anlage mit einem zu verschließenden Endbereich des Membranröhrchen-Abschnitts aufweist. The invention further relates to a device for the end-side sealing of a membrane tube section for a membrane element, in particular a filter membrane element, with a closure device which has a forming surface inside a mold bore for engagement with an end region of the membrane tube section to be closed ,
Bei der Mikrofiltration erfolgt die Abscheidung von Partikeln überwiegend an der Oberfläche einer porösen Membran. Die Membran weist Poren oder Durchlässe sehr geringen In microfiltration, the deposition of particles occurs predominantly on the surface of a porous membrane. The membrane has pores or passages very small
Durchmessers auf, so dass die abzuscheidenden Partikel die Membran nicht durchdringen können. Die fluide Phase einer zu filtrierenden Suspension kann die Membran durchströmen, während die Partikel zurückgehalten werden. Eine entsprechende Membran kann alternativ auch- dazu genutzt werden, einen Fluidstrom, beispielsweise einen Luftstrom in eine Vielzahl von Einzelströmen zu unterteilen, was beispiels- weise beim Aufschäumen einer Flüssigkeit, insbesondere Milch, vorteilhaft ist. Im Folgenden wird zwar davon ausgegangen, dass die Membran zur Mikrofiltration verwendet wird, jedoch ist die Erfindung darauf nicht beschränkt. Diameter, so that the particles to be separated can not penetrate the membrane. The fluid phase of a suspension to be filtered can flow through the membrane while retaining the particles. Alternatively, a corresponding membrane can also be used to subdivide a fluid flow, for example an air flow, into a multiplicity of individual flows, which, for example, wise when foaming a liquid, especially milk, is advantageous. Although it will be assumed below that the membrane is used for microfiltration, the invention is not limited thereto.
Rohrförmige Membrane werden häufig in der sogenannten dynamischen Mikrofiltration eingesetzt. Ein rohrförmiges Filtermembran-Element wird an seinem einen axialen Ende verschlossen und vor oder nach dem Verschließen an seinem entgegengesetzten axialen Ende mit einem Adapterteil aus Tubular membranes are often used in the so-called dynamic microfiltration. A tubular filter membrane element is closed at its one axial end and before or after closing at its opposite axial end with an adapter part
Kunststoff versehen. Bei dem. Adapterteil kann es sich beispielsweise um eine Anschlussbuchse für eine Fluidleitung oder ein sonstiges, für den Gebrauch des Filtermembran- Elementes notwendiges Funktionsteil handeln. Plastic provided. In the . Adapter part may be, for example, a connection socket for a fluid line or other, necessary for the use of the Filtermembran- element functional part.
Die zu filtrierende Suspension kann entweder in den Innenraum des rohrförmigen Filtermembran-Elements eingeleitet werden, wobei die fluide Phase der Suspension die Wandung des Filtermembran-Elements durchströmt und auf diese Weise abgeführt wird, während die Partikel in dem Filtermembran- Element verbleiben. Es ist jedoch auch die umgekehrte Strömung möglich, d.h. zu filtrierende Suspension steht außenseitig des rohrförmigen Filtermembran-Elementes an und die fluide Phase durchdringt die Wandung des Filtermembran- Elementes, gelangt in dessen Innenraum und wird dort abgeführt, während die ausgefilterten Partikel außenseitig des Filtermembran-Elementes verbleiben . The suspension to be filtered can either be introduced into the interior of the tubular filter membrane element, wherein the fluid phase of the suspension flows through the wall of the filter membrane element and in this way is removed while the particles remain in the filter membrane element. However, the reverse flow is also possible, i. to be filtered suspension is on the outside of the tubular filter membrane element and the fluid phase penetrates the wall of the Filtermembran- element, enters its interior and is discharged there, while the filtered particles remain on the outside of the filter membrane element.
In Abhängigkeit von der Größe und insbesondere dem Innendurchmesser des rohrförmigen Filtermembran-Elementes werden diese auch als Kapillarmembrane oder bei sehr kleinem Innendurchmesser auch als Hohlfasermembrane bezeichnet. Zur Herstellung eines Filtermembran-Elementes wird ein Abschnitt von einem "endlosen" Membranröhrchen abgetrennt. Bei dem Membranröhrchen kann es sich beispielsweise um ein schlauchartiges Kunststoff-Röhrchen mit Poren und Durchlässen geringen Durchmessers handeln. Der Membranröhrchen- Abschnitt wird in seinem einen Endbereich verschlossen und im anderen Endbereich mit dem Adapterteil versehen. Das Verschließen des Membranröhrchen-Abschnitts erfolgt üblicherweise dadurch, dass der Membranröhrchen-Abschnitt von einem Benutzer manuell mit einer erwärmten oder erhitzten Platte in Kontakt gebracht wird, wodurch das Kunststoff- Material anschmilzt oder aufschmilzt und dann durch Aufbringung von geringen Druckkräften verschlossen wird. Depending on the size and in particular the inner diameter of the tubular filter membrane element, these are also referred to as capillary membranes or, in the case of a very small inner diameter, also as hollow-fiber membranes. To make a filter membrane element, a section is separated from an "endless" membrane tube. The membrane tube may, for example, be a tubular plastic tube with small diameter pores and passages. The membrane tube section is closed in its one end region and provided in the other end region with the adapter part. The sealing of the membrane tube section is usually accomplished by manually contacting the membrane tube section with a heated or heated plate by a user, thereby melting or fusing the plastic material and then sealing it by applying low compressive forces.
Die US 2004/0211785 AI zeigt ein Verfahren und eine Vorrichtung zum Verschließen von Kunststoffröhrchen. Dabei wird ein Rohrabschnitt an seinem einen axialen Ende unter Drehung soweit erwärmt, dass er verformbar ist. Anschließend wird das erwärmte Ende des Röhrchens gegen oder in eine Kammer eines Formteils gedrückt und dadurch verschlossen und abgerundet. Dieses Vorgehen ist in der praktischen Umsetzung sehr schwierig, da die Erwärmung des Endabschnitts des Röhrchens exakt so erfolgen muss, dass da's Material des Röhrchens verformbar ist, aber seine Stabilität noch behält, da es ansonsten nicht in die Kammer des Formteils eingeführt werden kann. Dies führt dazu, dass in der Praxis der Endabschnitt des Röhrchens in vielen Fällen nicht ausreichend erwärmt ist und somit nicht richtig verschlossen werden kann oder zu stark erwärmt ist und dadurch bereits vor seiner Umformung seiner Stabilität und■ Form verliert. US 2004/0211785 A1 shows a method and a device for closing plastic tubes. In this case, a pipe section is heated at its one axial end while turning so far that it is deformable. Subsequently, the heated end of the tube is pressed against or into a chamber of a molded part and thereby closed and rounded. This procedure is very difficult in practice, since the heating of the end portion of the tube must be exactly so that the material of the tube is deformable, but still retains its stability, since it can not otherwise be introduced into the chamber of the molding. This means that is not sufficiently heated, in practice, the end portion of the tube in many cases and thus can not be closed properly or is heated too much and loses before its conversion to its stability and ■ shape.
Die Durchflussmenge eines einzelnen rohrförmigen Filtermembran-Elementes ist aufgrund der sehr kleinen Dimension gering, so dass es üblich ist, eine Vielzahl von rohrförmi- gen Filtermembran-Elementen auf einem sogenannten Filter¬ membran-Modul zusammen zu fassen. Der Membranröhrchen- Abschnitt jedes einzelnen Filtermembran-Elementes muss manuell an einem Ende verschlossen werden. Dies ist sehr zeitaufwändig und somit kostenintensiv. Darüber hinaus muss sichergestellt sein, dass der Membranröhrchen-Abschnitt an seinem Ende zuverlässig verschlossen ist, so dass keine Kurzschlussströmung auftritt. Dies erfordert eine aufwändige und teure Qualitätskontrolle. The flow rate of a single tubular filter membrane element is due to the very small dimension low, so that it is common practice to combine a plurality of tubular filter membrane elements on a so-called filter ¬ membrane module together. The membrane tube section of each filter membrane element must be closed manually at one end. This is very time consuming and therefore costly. In addition, it must be ensured that the membrane tube section is reliably closed at its end, so that no short-circuit flow occurs. This requires a complex and expensive quality control.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum endseitigen Verschließen eines Membranröhrchen-Äbschnitts für ein Membran-Element, insbesondere ein Filtermembran- Element zu schaffen, mit dem sich ein zu verschließender Endbereich des Membranröhrchen-Äbschnitts zuverlässig und in einfacher Weise verschließen lässt. The invention has for its object to provide a method for the end-side closing of a membrane tube Äbschnitts for a membrane element, in particular a Filtermembran- element with which can be closed reliably and in a simple manner to be closed end portion of the membrane tube Äbschnitts.
Darüber hinaus soll eine Vorrichtung zum endseitigen Verschließen eines Membranröhrchen-Äbschnitts für ein Membran- Element, insbesondere ein Filtermembran-Element geschaffen werden, die in konstruktiv einfacher Weise aufgebaut ist. In addition, a device for the end-side closing of a membrane tube Äbschnitts for a membrane element, in particular a filter membrane element to be created, which is constructed in a structurally simple manner.
Hinsichtlich des Verfahrens wird die oben genannte Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Dabei ist vorgesehen, dass die Verschließvorrichtung mit der Formbohrung auf eine Temperatur oberhalb der With regard to the method, the above-mentioned object is achieved by a method having the features of claim 1. It is envisaged that the closing device with the mold bore to a temperature above the
Schmelztemperatur des Materials des Membranröhrchen- Äbschnitts erwärmt wird und beim Verschließen des Endbereichs relativ zum Membran-röhrchen-Abschnitt gedreht oder geschwenkt wird. Die Erfindung geht von der Grundüberlegung aus, dass ein großer Teil der unvollständig oder schlecht verschlossenen Membranröhrchen-Abschnitte darin begründet ist, dass der Benutzer den zu verschließenden Endabschnitt des Membran- röhrchen-Abschnittes falsch oder zu lange mit der erwärmten VerschließVorrichtung punktuell in Kontakt bringt, wodurch auch ein Durchbrennen des Kunststoff-Materials auftreten kann. Dies wird erfindungsgemäß dadurch vermieden, dass die erwärmte Verschließvorrichtung beim Verschließen des Endbereichs relativ zum Membranröhrchen-Abschnitt gedreht oder hin- und her geschwenkt wird. Melting temperature of the material of the membrane tube Äbschnitts is heated and is rotated or pivoted when closing the end portion relative to the membrane tube section. The invention is based on the basic idea that a large part of the incompletely or poorly sealed membrane tube sections is based on the fact that the user causes the end section of the membrane tube section to be closed to be contacted incorrectly or too long with the heated closing device, whereby a burn through of the plastic material can occur. This is inventively avoided in that the heated closing device is rotated when turning the end portion relative to the membrane tube section or pivoted back and forth.
Dabei ist vorgesehen, dass der zu verschließende Endbereich des Membranröhrchen-Abschnitts in die Formbohrung der Verschließvorrichtung eingeführt wird. Der Membranröhrchen- Abschnitt besitzt normalerweise eine kreiszylindrische Form. Auch die Formbohrung kann eine kreis zylindrische Form besitzen, so dass der Membranröhrchen-Abschnitt entweder mit geringem Spiel oder unter enger Passung in die Formbohrung eingeführt werden kann. Die Innenwandung der Formbohrung ist auf die genannte Temperatur oberhalb der Schmelztemperatur des Materials und insbesondere des Kunststoff- Materials des Membranröhrchen-Abschnitts erwärmt, wodurch das Material des Membranröhrchen-Abschnitts zumindest in dem zu verschließenden Endbereich angeschmolzen wird. Vorzugsweise wird der zu verschließende Endabschnitt des Membran-Röhrchen-Abschnitts in der Formbohrung zusammengedrückt und dadurch verschlossen. It is provided that the end region of the membrane tube section to be closed is introduced into the mold bore of the closing device. The membrane tube section normally has a circular cylindrical shape. Also, the mold bore may have a circular cylindrical shape, so that the membrane tube section can be inserted into the mold bore with little clearance or tight fit. The inner wall of the mold bore is heated to said temperature above the melting temperature of the material and in particular of the plastic material of the membrane tube section, whereby the material of the membrane tube section is melted at least in the end region to be closed. Preferably, the end portion to be closed of the membrane tube portion is compressed in the mold bore and thereby closed.
In besonders bevorzugter Ausgestaltung der Erfindung kann vorgesehen sein, dass das Zusammendrücken des zu verschließenden Endbereichs des Membranröhrchen-Abschnitts in einem sich konisch verjüngenden Abschnitt der Formbohrung er- folgt. Der sich konisch verjüngende Abschnitt der Formbohrung sorgt bei gleichzeitiger Drehung oder Schwenkung der Formbohrung relativ zu dem Membranröhrchen-Abschnitt für einen sicheren Verschluss des Membranröhrchen-Abschnitts . Die Formbohrung kann auch über ihre gesamte Länge mit einem sich konisch verjüngenden Querschnitt ausgebildet sein. Die Wandung der Formbohrung stabilisiert den Membranröhrchen- Abschnitt während dieses Vorgangs und verhindert ein seitliches Ausweichen. In a particularly preferred embodiment of the invention, it can be provided that the compression of the end region of the membrane tube section to be closed is achieved in a conically tapering section of the mold bore. follows. The conically tapered portion of the mold bore, with simultaneous rotation or pivoting of the mold bore relative to the membrane tube section, provides for secure closure of the membrane tube section. The mold bore can also be formed over its entire length with a conically tapering cross-section. The wall of the mold bore stabilizes the membrane tube section during this process and prevents lateral deflection.
In bevorzugter Ausgestaltung der Erfindung ist vorgesehen, dass das Membranröhrchen-Abschnitts während des Verschließens drehfest gehalten wird, während die Verschließvorrichtung mit der Formbohrung mittels der Antriebsvorrichtung vorzugsweise in Form eines Servomotors gedreht oder hin- und her geschwenkt wird. In a preferred embodiment of the invention, it is provided that the membrane tube section is rotatably held during the closing, while the closing device is rotated with the mold bore by means of the drive device, preferably in the form of a servo motor or pivoted back and forth.
Die Temperatur der Verschließvorrichtung wird vorzugsweise in einem vorbestimmten Temperaturbereich mit hoher Genauigkeit gehalten. Die Temperatur, auf die die Verschließvorrichtung erwärmt wird, hängt von dem Aufbau des Membranröhrchen-Abschnitts und insbesondere von dessen Material ab und kann beispielsweise im Bereich von 220°C bis 250°C liegen. Vorzugsweise wird die Verschließvorrichtung auf eine Temperatur von 250°C oder mehr und insbesondere auf 280°C oder mehr und insbesondere auf eine Temperatur im Bereich von 280°C bis 300°C erwärmt. The temperature of the closing device is preferably maintained within a predetermined temperature range with high accuracy. The temperature to which the sealing device is heated depends on the structure of the membrane tube section and in particular its material, and may for example be in the range of 220 ° C to 250 ° C. Preferably, the closing device is heated to a temperature of 250 ° C or more and more preferably to 280 ° C or more, and more preferably to a temperature in the range of 280 ° C to 300 ° C.
In Weiterbildung der Erfindung kann ein Reinigungsmodus vorgesehen sein. In dem Reinigungsmodus wird die Verschließvorrichtung zumindest im Bereich der Formbohrung auf eine Reinigungstemperatur von > 300 °C erwärmt, wodurch Kunststoff-Teilchen oder Kunststoff-Reste , die an der Ober- fläche der Verschließvorrichtung und insbesondere im Inneren der Formbohrung anhaften, verbrannt werden. Die Reinigungstemperatur kan im Bereich von 350 °C bis 450 °C liegen. In a further development of the invention, a cleaning mode can be provided. In the cleaning mode, the closing device is heated, at least in the region of the mold bore, to a cleaning temperature of> 300 ° C., whereby plastic particles or plastic residues, which are located at the top of the mold bore, are heated. surface of the closing device and in particular in the interior of the mold bore adhere, are burned. The cleaning temperature can be in the range of 350 ° C to 450 ° C.
In vorrichtungstechnischer Hinsicht wird die oben genannte Aufgabe durch eine Vorrichtung mit den Merkmalen des Anspruchs 9 gelöst. Dabei ist zumindest eine Heizvorrichtung vorgesehen, mittels der die Verschließvorrichtung mit der Formbohrung auf eine Temperatur oberhalb der Schmelztemperatur des Materials und insbesondere des Kunststoff- Materials des Membranröhrchen-Abschnitts erwärmbar ist. Die Formfläche ist im Inneren der Formbohrung ausgebildet, wobei die Formbohrung in einem Gehäuse der Verschließvorrichtung ausgebildet ist und das Gehäuse mittels einer Antriebsvorrichtung relativ zum Membranröhrchen-Abschnitt um eine Drehachse drehbar oder schwenkbar ist. Der Membranröhrchen-Abschnitt wird mit seinem zu verschließenden Endbereich in die erwärmte, sich drehende oder schwenkende Formbohrung eingeführt. Dadurch wird das Material des Endbereichs angeschmolzen und durch die von der Wandung der Formbohrung als Reaktionskraft ausgeübten Druckkräfte verschlossen . In device technical terms, the above object is achieved by a device having the features of claim 9. In this case, at least one heating device is provided, by means of which the closing device with the mold bore can be heated to a temperature above the melting temperature of the material and in particular of the plastic material of the membrane tube section. The mold surface is formed inside the mold bore, wherein the mold bore is formed in a housing of the closing device and the housing is rotatable or pivotable about a rotation axis relative to the membrane tube section by means of a drive device. The membrane tube section is inserted with its end to be closed in the heated, rotating or pivoting mold bore. As a result, the material of the end region is melted and closed by the force exerted by the wall of the mold bore as reaction force compressive forces.
Es hat sich als vorteilhaft erwiesen, wenn die Formbohrung koaxial zur Drehachse des Gehäuses verläuft. It has proven to be advantageous if the mold bore extends coaxially to the axis of rotation of the housing.
Die Formbohrung besitzt eine nach außen mündende Einführöffnung und einen am entgegengesetzten Ende liegenden Abschnitt, der vorzugsweise als sich konisch verjüngender Abschnitt ausgebildet ist, so dass auf den zu verschließenden Endbereich des Membranröhrchen-Abschnitts beim Einführen in die Formbohrung durch die Wandung des sich konisch verjüngenden Abschnitts radial nach innen wirkende Druckkräfte aufgebracht werden, die den Endbereich verschließen. Die Formbohrung kann auch über ihre gesamte Länge mit einem sich konisch verjüngenden Querschnitt ausgebildet sein. The mold bore has an outwardly opening insertion opening and an opposite end portion, which is preferably formed as a conically tapered portion, so that on the end region to be closed of the membrane tube portion when inserted into the mold bore through the wall of the conically tapered portion radially inward pressure forces be applied, which close the end. The mold bore can also be formed over its entire length with a conically tapering cross-section.
Das Gehäuse, in dem die Formbohrung ausgebildet ist, wird erwärmt und vorzugsweise in einem vorbestimmten Temperaturbereich gehalten. Zu diesem Zweck kann dem Gehäuse eine äußere 1. Heizvorrichtung und/oder eine innere 2. Heizvorrichtung zugeordnet sein. Die äußere 1. Heizvorrichtung bezeichnet zumindest ein Heizelement und insbesondere ein Widerstands-Heizelement, das auf der Außenseite des Gehäuses angeordnet ist. Die innere 2. Heizvorrichtung ist vorzugsweise von einem Kanalsystem im Inneren des Gehäuses gebildet, das von einer erwärmten oder heißen Flüssigkeit oder einem Gas durchströmt ist und auf diese Weise das Gehäuse von innen heraus erwärmt . Alternativ kann die innere 2. The housing in which the mold bore is formed is heated and preferably maintained in a predetermined temperature range. For this purpose, the housing may be assigned an outer heating device 1 and / or an inner heating device 2. The outer heating device 1 designates at least one heating element and in particular a resistance heating element, which is arranged on the outside of the housing. The inner second heating device is preferably formed by a channel system in the interior of the housing, which is flowed through by a heated or hot liquid or a gas and in this way heats the housing from the inside out. Alternatively, the inner 2.
Heizvorrichtung auch von einem Heizelement und insbesondere einem Widerstands-Heizelement gebildet sein. Heating device also be formed by a heating element and in particular a resistance heating element.
In Weiterbildung der Erfindung ist zumindest ein Temperatursensor vorgesehen, der mit einer Steuereinheit verbunden ist. Aufgrund der Daten des Temperatursensors kann die Temperatur des Gehäuses und/oder der- Formfläche mittels der Steuereinheit in einen vorbestimmten Temperaturbereich gehalten werden. In a development of the invention, at least one temperature sensor is provided, which is connected to a control unit. Due to the data of the temperature sensor, the temperature of the housing and / or the molding surface can be maintained by means of the control unit in a predetermined temperature range.
Vorzugsweise kann die Verschließvorrichtung mittels der Heizvorrichtung auf eine Temperatur von 250 "C oder mehr und insbesondere von 280°C oder mehr erwärmt werden. Zur Durchführung des oben genannten optionalen Reinigungsmodus kann vorgesehen sein, dass die Verschließvorrichtung mittels der Heizvorrichtung auf eine Temperatur von mehr als 300 °C erwärmbar ist. Das Gehäuse kann entweder vollständig oder zumindest in dem Bereich, in dem die Formbohrung ausgebildet ist, aus Keramik oder Metall bestehen. Preferably, the sealing device can be heated to a temperature of 250 ° C. or more and in particular 280 ° C. or more by means of the heating device 300 ° C is heated. The housing can either completely or at least in the region in which the mold bore is formed, made of ceramic or metal.
Weitere Einzelheiten und Merkmale der Erfindung sind aus der folgenden Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung ersichtlich. Es zeigen: Further details and features of the invention will become apparent from the following description of an embodiment with reference to the drawings. Show it:
Fig. 1 Einen Schnitt durch eine erfindungsgemäße Vorrichtung zum endseitigen Verschließen eines Mem- branröhrchen-Abschnitts für ein Filtermembran- Element vor dem Einführen des Membranröhrchen- Abschnitts und 1 shows a section through a device according to the invention for the end-side closing of a membrane tube section for a filter membrane element prior to insertion of the membrane tube section and FIG
Fig. 2 die Vorrichtung gemäß Figur 1 mit eingeführtem und verschlossenen Membranröhrchen-Abschnitt . Fig. 2 shows the device of Figure 1 with inserted and sealed membrane tube section.
Figur 1 zeigt ein Schnitt durch eine Verschließvorrichtung 10, mit der ein rohrförmiges Membran-Element, insbesondere ein Filtermembran-Element F zur Mikrofiltration verschlossen wird. Das Filtermembran-Element F besitzt einen Membranröhrchen-Abschnitt S aus Kunststoff, der an seinem einen, gemäß Figur 1 linken Ende mit einem Adapterteil A aus Kunststoff verbunden ist, das eine Anschlussbuchse für eine Fluidleitung bildet. An seinem entgegengesetzten, gemäß Figur 1 rechten Endbereich E ist der Membranröhrchen- Abschnitt S noch offen. Figure 1 shows a section through a closing device 10, with which a tubular membrane element, in particular a filter membrane element F is closed for microfiltration. The filter membrane element F has a membrane tube section S made of plastic, which is connected at its one, according to FIG 1 left end with an adapter part A made of plastic, which forms a connection socket for a fluid line. At its opposite, according to Figure 1 right end portion E of the membrane tube section S is still open.
Die Verschließvorrichtung 10 weist ein vorzugsweise aus Keramik bestehendes Gehäuse 11 auf, in dem eine Formbohrung 12 ausgebildet ist, deren Innenwandung eine Formfläche 25 bildet. Die Formbohrung 12 besitzt an ihrem inneren Ende einen sich konisch verjüngenden Abschnitt 13. Das GehäuseThe closing device 10 has a preferably made of ceramic housing 11, in which a mold bore 12 is formed, whose inner wall forms a molding surface 25. The mold bore 12 has at its inner end a conically tapered section 13. The housing
11 ist mittels einer nur schematisch angedeuteten Antriebsvorrichtung 14 um eine Drehachse L drehbar oder hin- und her schwenkbar, wie es durch den Doppelpfeil R angedeutet ist. Die Drehachse L des Gehäuses 11 fällt mit der Längsachse der Formbohrung 12 zusammen. 11 is rotatable about an axis of rotation L or back and forth by means of an only schematically indicated drive device 14, as it is indicated by the double arrow R. The axis of rotation L of the housing 11 coincides with the longitudinal axis of the mold bore 12.
In dem Gehäuse 11 ist nahe der zylindrischen Wandung der Formbohrung 12 ein 1. Temperatursensor 21 angeordnet, der über eine Leitung 23 mit einer Steuereinheit 17 verbunden ist. Im Bereich des konischen Abschnitts 13 der FormbohrungIn the housing 11, a first temperature sensor 21 is arranged near the cylindrical wall of the mold bore 12, which is connected via a line 23 to a control unit 17. In the region of the conical section 13 of the mold bore
12 ist ein 2. Temperatursensor 22 angeordnet, der über eine Leitung 24 mit der Steuereinheit 17 verbunden ist. 12, a second temperature sensor 22 is arranged, which is connected via a line 24 to the control unit 17.
Auf der Außenseite des Gehäuses ist eine äußere 1. Heizvorrichtung 15 angeordnet, bei der es sich insbesondere um eine elektrische Widerstandsheizung handeln kann. Die 1. On the outside of the housing, an outer heater 1 15 is arranged, which may in particular be an electrical resistance heater. The 1.
Heizvörrichtung 15 steht über eine Leitung 18 mit der Steuereinheit 17 in Verbindung. Heizvörrichtung 15 is connected via a line 18 to the control unit 17 in connection.
Im Inneren des Gehäuses ist eine innere 2. Heizvorrichtung 16 vorgesehen, bei der es sich entweder ebenfalls um eine elektrische Widerstandsheizung oder auch um ein Kanalsystem handeln kann, in dem ein erwärmtes oder heißes Fluid (Flüssigkeit oder Gas) strömt. Die 2. Heizvorrichtung 16 ist über eine Leitung 20 mit der Steuereinheit 17 verbunden. Inside the housing, an internal second heating device 16 is provided, which may also be either an electrical resistance heater or a channel system in which a heated or hot fluid (liquid or gas) flows. The second heater 16 is connected via a line 20 to the control unit 17.
Zusätzlich ist die Steuereinheit 17 auch über eine Leitung 19 mit der Antriebsvorrichtung 14 verbunden. In addition, the control unit 17 is also connected via a line 19 to the drive device 14.
Um den gemäß Figur 1 rechten Endbereich E des Membran- röhrchen-Abschnitts S zu verschließen, wird der Membran- röhrchen-Abschnitt S mit seinem zu verschließenden Endbe- reich E in die Formbohrung 12 des erwärmten Gehäuses 11 eingeführt. Dies kann entweder dadurch geschehen, dass der Membranröhrchen-Abschnitt axial vorgeschoben und in die Formbohrung 12 eingebracht wird, alternativ ist es jedoch auch möglich, das Adapterteil und den Membranröhrchen- Abschnitt S ortsfest zu halten und die Verschließvorrichtung gemäß Figur 1 nach links zu verschieben, so dass der Membranröhrchen-Abschnitt S in die Formbohrung eintritt. In order to close the right end region E of the membrane tube section S according to FIG. 1, the membrane tube section S is closed with its end region to be closed. rich E introduced into the mold bore 12 of the heated housing 11. This can be done either by axially advancing the membrane tube section and inserting it into the mold bore 12, but alternatively it is also possible to hold the adapter part and the membrane tube section S stationary and move the closing device according to FIG. 1 to the left, so that the membrane tube section S enters the mold bore.
Aufgrund der Erwärmung des Gehäuses 11 und somit der Wandung der Formbohrung 12 wird das Material des Membran- Röhrchen-Abschnitts S ebenfalls erwärmt. Dabei sind die Temperaturen so abgestimmt, dass der Membranröhrchen-Ab¬ schnitt S in seinem zu verschließenden Endbereich anschmilzt. Durch den konischen Abschnitt 13 wird auf den zu verschließenden Endbereich E des Membranröhrchen-Abschnitts S eine radial nach innen gerichtete Druckkraft aufgebracht, wodurch der Endbereich E zusammengedrückt und verschlossen wird. Dieser Zustand ist in Figur 2 dargestellt. Due to the heating of the housing 11 and thus the wall of the mold bore 12, the material of the membrane tube section S is also heated. The temperatures are adjusted so that the membrane tube Ab ¬ section S melts in its end region to be closed. By the conical portion 13, a radially inwardly directed compressive force is applied to the end region E of the membrane tube section S to be closed, whereby the end region E is compressed and closed. This condition is shown in FIG.
Durch die gleichzeitige Drehung des Gehäuses 11 um die Drehachse L wird einerseits verhindert, dass das Kunststoff-Material des Membranröhrchen-Abschnitts S an der Wandung der Formbohrung 12 anhaftet und andererseits ist sichergestellt, dass es nicht zu übermäßigen örtlichen Erhitzungen des Kunststoff-Materials des Membranröhrchen-Abschnitts S kommt. By the simultaneous rotation of the housing 11 about the axis of rotation L on the one hand prevents the plastic material of the membrane tube portion S adheres to the wall of the mold bore 12 and on the other hand it is ensured that there is no excessive local heating of the plastic material of the membrane tube Section S is coming.
Anschließend wird das Filtermembran-Element F und damit auch der Membranröhrchen-Abschnitt S aus der Formbohrung 12 wieder herausgezogen, wobei er anschließend abkühlt, so dass der Membranröhrchen-Abschnitt S fest verschlossen ist. Mittels der Steuereinheit 17, die die 1. Heizvorrichtung 15 und die 2. Heizvorrichtung 16 in Abhängigkeit von den festgestellten IST-Temperaturen an dem 1. Temperatursensor 21 und dem 2. Temperatursensor 22 ansteuert, wird die Tempera- tur des Gehäuses 11 und insbesondere der Formbohrung 12 in einem gewünschten Temperaturbereich gehalten. Subsequently, the filter membrane element F and thus also the membrane tube section S is pulled out of the mold bore 12 again, wherein it then cools, so that the membrane tube section S is firmly closed. By means of the control unit 17, which controls the first heating device 15 and the second heating device 16 as a function of the detected actual temperatures at the first temperature sensor 21 and the second temperature sensor 22, the temperature of the housing 11 and in particular the Mold bore 12 held in a desired temperature range.
Die Verschließvorrichtung 10 kann in einem Reinigungsmodus betrieben werden. Zu diesem Zweck werden die 1. Heizvor- richtung 15 und/oder die 2. Heizvorrichtung 16 von derThe closure device 10 can be operated in a cleaning mode. For this purpose, the first heating device 15 and / or the second heating device 16 are of the
Steuereinheit 17 so angesteuert,, dass die Temperatur im Gehäuse 11 und insbesondere an der Wandung der Formbohrung 12 auf einen hohen Wert von beispielsweise ca. 400 °C gebracht wird, wodurch eventuell anhaftende Kunststoff-Reste ver- brannt werden. Controlled control unit 17, that the temperature in the housing 11 and in particular on the wall of the mold bore 12 is brought to a high value of, for example, about 400 ° C, whereby any adhering plastic residues are burned.

Claims

Patentansprüche claims
Verfahren zum endseitigen Verschließen eines Membran röhrchen-Abschnitts (S) für ein Membran-Element (F) , wobei ein zu verschließender Endbereich (E) des Memb ranröhrchen-Abschnitts (S) erwärmt und zumindest angeschmolzen und in eine Formbohrung (12) einer Verschließvorrichtung (10) eingeführt und verschlossen wird, dadurch gekennzeichnet, dass die Verschließvor richtung (10) mit der Formbohrung (12) auf eine Temperatur oberhalb der Schmelztemperatur des Materials des Membranröhrchen-Abschnitts (S) erwärmt wird und beim Verschließen des Endbereichs (E) mittels einer Antriebsvorrichtung (14) relativ zum Membranröhrchen Abschnitt (S) gedreht oder geschwenkt (Pfeil R) wird A method for closing a membrane tube section (S) for a membrane element (F), wherein to be closed end region (E) of the membrane tube portion (S) heated and at least fused and into a mold bore (12) of a closing device (10) is introduced and sealed, characterized in that the Verschließvor direction (10) with the mold bore (12) to a temperature above the melting temperature of the material of the membrane tube section (S) is heated and closing the end region (E) by means of a drive device (14) relative to the membrane tube portion (S) is rotated or pivoted (arrow R)
Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der zu verschließende Endbereich (E) des Membranröhrchen-Abschnitts (S) in der Formbohrung (12) zusammengedrückt wird. A method according to claim 1, characterized in that the end region (E) to be closed of the membrane tube section (S) in the mold bore (12) is compressed.
Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das Zusammendrücken des zu verschließenden Endbereichs (E) des Membranröhrchen-Abschnitts (S) in einem sich konisch verjüngenden Abschnitt (13) der Formbohrung (12) erfolgt. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Verschließvorrichtung (10) auf eine Temperatur von 250 °C oder mehr erwärmt wird. A method according to claim 2, characterized in that the compression of the end region (E) of the membrane tube section (S) to be closed takes place in a conically tapering section (13) of the mold bore (12). Method according to one of claims 1 to 3, characterized in that the closing device (10) is heated to a temperature of 250 ° C or more.
Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Verschließvorrichtung (10) auf eine Tempera¬ tur von 280 °C oder mehr erwärmt wird. A method according to claim 4, characterized in that the closing device (10) is heated to a tempera ture of 280 ° C ¬ or more.
Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Temperatur der Verschließvorrichtung (10) in einem vorbestimmten Temperaturbereich gehalten wird. Method according to one of claims 1 to 5, characterized in that the temperature of the closing device (10) is maintained in a predetermined temperature range.
Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Verschließvorrichtung (10) in einem Reinigungsmodus auf eine Reinigungstemperatur > 300°C erwärmt wird, so dass anhaftende Kunststoff-Teilchen verbrannt werden. Method according to one of claims 1 to 6, characterized in that the closing device (10) is heated in a cleaning mode to a cleaning temperature> 300 ° C, so that adhering plastic particles are burned.
Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Reinigungstemperatur im Bereich von 350 °C bis 450°C liegt. A method according to claim 7, characterized in that the cleaning temperature is in the range of 350 ° C to 450 ° C.
Vorrichtung zum endseitigen Verschließen eines Mem- branröhrchen-Abschnitts (S) für ein Membran-ElementDevice for the end closure of a membrane tube section (S) for a membrane element
(F), mit einer Verschließvorrichtung (10), die eine Formfläche (25) im Inneren einer Formbohrung (12) zur Anlage mit einem zu verschließenden Endbereich (E) des Membranröhrchen-Abschnitts (S) aufweist, dadurch gekennzeichnet, dass zumindest eine Heizvorrichtung(F), comprising a closing device (10), which has a forming surface (25) in the interior of a mold bore (12) for engagement with an end region (E) of the membrane tube section (S) to be closed, characterized in that at least one heating device
(15, 16) vorgesehen ist, mittels der die Verschließvorrichtung (10) mit der Formbohrung (12) auf eine Temperatur oberhalb der Schmelztemperatur des Materi- als des Membranröhrchen-Abschnitts (S) erwärmbar ist, dass die Formbohrung (12) in einem Gehäuse (11) der Verschließvorrichtung (10) ausgebildet ist und dass das Gehäuse (11) mittels einer Antriebsvorrichtung (14) relativ zum Membranröhrchen-Abschnitt (S) um eine Drehachse (L) drehbar oder schwenkbar ist. (15, 16) is provided, by means of which the closing device (10) with the mold bore (12) to a temperature above the melting temperature of the material as the membrane tube section (S) is heated, that the mold bore (12) in a housing (11) of the closing device (10) is formed and that the housing (11) by means of a drive device (14) relative to the membrane tube section (S ) is rotatable or pivotable about a rotation axis (L).
Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Formbohrung (12) koaxial zur Drehachse' (L) des Gehäuses (11) verläuft. Apparatus according to claim 9, characterized in that the mold bore (12) coaxial with the axis of rotation '(L) of the housing (11).
Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Formbohrung (12) einen sich konisch verjüngenden Abschnitt (13) aufweist. Apparatus according to claim 9 or 10, characterized in that the mold bore (12) has a conically tapered portion (13).
Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass dem Gehäuse (11) eine äußere 1. Heizvorrichtung (15) und/oder eine innere 2. Heizvorrichtung (16) zugeordnet ist. Device according to one of claims 9 to 11, characterized in that the housing (11) is associated with an outer 1st heating device (15) and / or an inner 2nd heating device (16).
Vorrichtung nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, dass zumindest ein Temperatursensor (21, 22) vorgesehen ist, der mit einer Steuereinheit (17) verbunden ist, wobei die Temperatur des Gehäuses (11) und/oder der Formfläche (25) mittels der Steuereinheit (17) in einem vorbestimmten Temperaturbereich- steuerbar ist. Device according to one of claims 9 to 12, characterized in that at least one temperature sensor (21, 22) is provided, which is connected to a control unit (17), wherein the temperature of the housing (11) and / or the forming surface (25). by means of the control unit (17) in a predetermined temperature range is controllable.
Vorrichtung nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, dass das Gehäuse (11) aus Keramik oder Metall besteht. Device according to one of claims 9 to 13, characterized in that the housing (11) consists of ceramic or metal.
15. Vorrichtung nach einem der Ansprüche 9 bis 14, dadurch gekennzeichnet, dass die Verschließvorrichtung (10) mittels der Heizvorrichtung (15, 16) auf eine Temperatur von 250 °C oder mehr erwärmbar ist. 15. Device according to one of claims 9 to 14, characterized in that the closing device (10) by means of the heating device (15, 16) is heated to a temperature of 250 ° C or more.
16. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass die Verschließvorrichtung (10) mittels der Heizvorrichtung (15, 16) auf eine Temperatur von 280°C oder mehr erwärmbar ist. 16. The apparatus according to claim 15, characterized in that the closing device (10) by means of the heating device (15, 16) is heatable to a temperature of 280 ° C or more.
17. Vorrichtung nach Anspruch 15 oder 16, dadurch gekennzeichnet, dass die Verschließvorrichtung (10) mittels der Heizvorrichtung (15, 16) auf eine Temperatur von 300 °C oder mehr erwärmbar ist. 17. The apparatus of claim 15 or 16, characterized in that the closing device (10) by means of the heating device (15, 16) is heated to a temperature of 300 ° C or more.
PCT/EP2017/000670 2016-05-11 2017-05-11 Method and device for sealing the end side of a membrane tube section for a membrane element WO2017194194A1 (en)

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DE102016005663.0A DE102016005663A1 (en) 2016-05-11 2016-05-11 Method and device for the end-side welding of a membrane tube section for a membrane element

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