CH504885A - Plastic gas and liquid filters plastic gas liquid filter - Google Patents
Plastic gas and liquid filters plastic gas liquid filterInfo
- Publication number
- CH504885A CH504885A CH1102269A CH1102269A CH504885A CH 504885 A CH504885 A CH 504885A CH 1102269 A CH1102269 A CH 1102269A CH 1102269 A CH1102269 A CH 1102269A CH 504885 A CH504885 A CH 504885A
- Authority
- CH
- Switzerland
- Prior art keywords
- threads
- filter
- nozzle
- support
- transverse
- Prior art date
Links
- 239000004033 plastic Substances 0.000 title claims description 11
- 239000007788 liquid Substances 0.000 title abstract 3
- 239000000463 material Substances 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 34
- 239000000969 carrier Substances 0.000 claims description 13
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 239000003610 charcoal Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 239000006260 foam Substances 0.000 abstract 1
- 239000011491 glass wool Substances 0.000 abstract 1
- 238000005192 partition Methods 0.000 abstract 1
- 125000006850 spacer group Chemical group 0.000 abstract 1
- 239000003000 extruded plastic Substances 0.000 description 3
- 238000009751 slip forming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/111—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
- B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
- B01D29/216—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets with wound sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
- B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/10—Brush filters ; Rotary brush filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
- B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/10—Filter screens essentially made of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/301—Extrusion nozzles or dies having reciprocating, oscillating or rotating parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/022—Air cleaners acting by gravity, by centrifugal, or by other inertial forces, e.g. with moistened walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/024—Air cleaners using filters, e.g. moistened
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/04—Supports for the filtering elements
- B01D2201/0407—Perforated supports on both sides of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/04—Supports for the filtering elements
- B01D2201/043—Filter tubes connected to plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0654—Support layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0672—The layers being joined by welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/069—Special geometry of layers
- B01D2239/0695—Wound layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2028/00—Nets or the like
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Textile Engineering (AREA)
- Filtering Materials (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Filter units or candles formed from concentric or spiral layers of porous mesh, pref, an extruded 'Netlon-type' mesh, heat sealed across one or both ends with compatible thermofusible spacers or covers. The filter cages thus produced may contain any suitable conventional filter medium such as a porous block of foam, active charcoal, glass wool, etc. The cages may be subdivided by porous partitions. General filtration of gas or liquid systems, usually as tubular or cylindrical units or cartridges. Low material and construction costs.
Description
Aus extrudierten Längs- und Querfäden bestehendes Kunststoff-Filternetz sowie Verfahren zu dessen Herstellung
Die Erfindung betrifft ein aus extrudierten Längsund Querfäden bestehendes Kunststoff-Filternetz, insbesondere zur Herstellung eines zylindrischen Netzmanteils für Filterkerzen. Weiterhin betrifft die Erfindung ein Verfahren zur Herstellung eines derartigen Netzes.
Kunststoffnetze aus extrudierten Längs- und Querfäden werden bekanntlich so hergestellt, dass die Längsfäden permanent aus Düsenöffnungen von Düsenträ gern eines Spritzkopfes extrudiert werden, während die Querfäden nur aus periodisch gebildeten bzw. periodisch freiwerdenden Düsenschlitzen austreten.
Bei der Vorrichtung gemäss der deutschen Patentschrift Nr. 1 109131 ist ein Spritzkopf mit zwei relativ zueinander bewegbaren Düsenscheiben vorgesehen. Solange diese mit Düsenöffnungen versehenen Düsenschei ben aneinandedie gen, werden Längsfäden extrudiert.
Durch Abheben der beiden Däsenscheiben voneinander ist die Extrusion von querveflaufenden Fäden möglich.
Netze mit längs- und querverlaufenden Fäden sind auch mit einer Vorrichtung gemäss der Auslegeschrift Nr. 1085 330 herstellbar. Auch hier werden die Längsfäden ständig durch entsprechende Düsenöffnungen extrudiert, während in einem besonderen Düsenträger vorgesehene querverlaufende Düsenöffnungen zur Bildung der Querfäden periodisch freigegegelben werden.
Aus der USA-Patentschrift Nr. 3 252 18 ist ebenfalls ein Spritzkopf bekannt, bei dem Längsfäden aus Düsenbohrungen in relativ zueinander bewegbaren Düsenträgern extrudiert werden. Querfäden werden durch zeitweiliges Abheben der Düsenträger voneinander gebildet. Die Düsenbohrungen zur Bildung der Längsfäden können hier gemäss einer Ausführungsform verschiedene Abmessungen haben.
Die Verwendung von extrudierten Kunststoffnetzen in der Filtsrtechnik stellt besondere Anforderungen an die Ausbildung dieser Netze. Einerseits sollen die durch die Fäden freigelfassenen Filteröffnungen entsprechend dem Verwendungszweck des Filters eine ausreichende Feinheit besitzen. Anderseits ist aber auch eine gewisse Widerstandsfähigkeit und Formstabilität erforderlich.
Der Erfindung liegt die Aufgabe zugrunde, insbesondere für Filterkerzen geeignete Netze aus extrudier# ten Kunststoffäden zu schaffen, die einerseits die erwünschte Feinheit der Filteröffnungen, anderseits aber auch eine für den jeweiligen Verwendungszweck ausreichende Formstabilität aufweisen.
Das Netz gemäss der Erfindung ist gekennzeichnet durch ein Stützgewebe aus mit Abstand voneinander angeordneten, längs- und querverlaufenden Stüzfäden und durch ein die von den Stützfäden freigelassenen Öffnungen überdeckendes, feinmaschiges Filtergewebe aus dünneren, längs- und querverlaufenden Fäden.
Ein derartiges Netz eignet sich besonders gut zur Bildung von Filtermänteln aus zwei überlagerten extrudierten Kunststoffnetzen, von denen das grobma- schige Netz als Stützgewebe zur Erhaltung einer gewissen Formstabilität dient, während das feinmaschige Netz als Filtergewebe wirkt. Diese beiden überlagerten Netze werden vorzugsweise gemeinsam extrudiert, wobei das Stützgewebe in dem vorzugsweise durchgehenden feinmaschigen Filtergewebe angeordnet sein kann.
Die Herstellung eines derartigen Netzes erfolgt unter Anwendung eines Spritzkopfes, bei dem einerseits durch Extrusion von Material durch in Düsenträgern angeordnete Düsenöffnungen Längsfäden fortlaufend und anderseits Querfäden durch ein relatives Verschie- ben der Düsenträger gebildet werden, erfindungsgemäss derart, dass die Düsenträger periodisch mehrmals kurzzeitig und mit geringem Abstand sowie elinlmal je Periode längerzeitig und mit grösserem Abstand voneinander abgehoben werden.
Nachfolgend werden ein Ausführungsbeispiel des Netzes rund des Verfahrens nach der Erfindung anhand der Zeichnungen näher erläutert. Es veranschaulichen:
Fig. 1 einen Ausschnitt eines Filtermanteis für eine Filterkerze im Längs schnitt,
Fig. 2 einen Querschnitt 2-2 des Flltermantels gemäss Fig. 1,
Fig. 3 einen Spritzkopf im Längsschnitt, in zwei verschiedenen Stellungen.
Der dargestellte, als Netzschlauch ausgebildete Fil termantel besteht aus extrudierten Längs- und Querfäden aus Kunststoff. Gemäss der Erfindung sind zwei überlagerte Netze vorgesehen, und zwar ein grobmaschiges Stützgewebe zur Erzeugung einer gewissen Formstabilität und ein engmaschiges Filternetz. Das Stützgewebe besteht aus verhältnismässig dicken, in Längsrichtung verlaufenden Stützfäden 10 und etwa gleich dimensionierten querverlaufenden Stützfäden 11.
Die Stützfäden 10 und 11 lassen verhältnismässig grosse Öffnungen 12 frei, die durch ein feinmaschiges Filtergewebe bedeckt sind. Das Filtergewebe besteht aus im Vergleich zu den Stützfäden 10 und 11 wesentlich dünneren, in Längsrichtung verlaufenden Filterfäden 13 und quer dazu gerichteten Filterfäden 14. Die längsund querverlanfenden Filterfäden sind mit geringen Abständen voneinander angeordnet, so dass ein engma- schiges Filtergewebe mit kleinen Durchtrittsöffnungen besteht.
Vorzugsweise sind zumindest die in Längsrichtung verlaufenden Filterfäden 13 durchgehend über die gesamte Länge des Netzes. Dies hat zur Folge, dass auf den querverlaufenden Stützfäden 11 die in Längsrichtung verlaufenden Filterfäden 13 erscheinen, und zwar entweder auf der Innenseite oder auf der Aussenseite als eng nebeneinanderliegende Rippen (siehe insbesondere Fig. 2).
Das Filtergewebe aus den Filterfäden 13 und 14 kann, wie bei dem dargestellten Ausführungsbeispiel, im radial aussen liegenden Bereich in bezug auf das aus den Stützfäden 10 und 11 gebildete Stützgewebe angeordnet sein. Das Netz kann aber auch so ausgebildet sein, dass das Filtergewebe mittig in bezug auf die Querschnittsabmessungen der Stützfäden 10 und 11 des Stützgewebes angeordnet ist oder auf der Innen seite des Stützgewebes.
In Fig. 3 ist in zwei unterschieldlichen Stellungen ein Ausführungsbeispiel eines Spritzkopfes zur Herstellung von Netzen unter Anwendung des Verfahrens nach der Erfindung teilweise dargestellt. Der Spritzkopf be steht aus einem unbeweglichen Aussenmantel 15 und einem koaxial zu diesem angeordneten Kern 16. Der Kern 16 ist in bezug auf den Aussenmantel 15 in Axialrichtung gemäss Pfeil 17 verschiebbar. In der einen, unteren Endstellung liegt dabei ein Düsenträger 18 des Kerns 16 an einem gegenüberliegenden Düsenträger 19 des Aussenmantels an. In einer anderen Endstellung des Kerns 16 ist der Düsenträger 18 vom Düsenträger 19 abgehoben, derart, dass ein ringsherum laufender Düsenschlitz 20 gebildet wird.
Die Düsenträger 18 und 19 sind mit Düsenbohrungen 21 bzw. 22 versehen. Diese Düsenbohrungen 21 und 22 sind ständig, also bei jeder Stellung des Kerns 16, offen, so dass Kunststoff extrudiert wird. Die im Querschnitt grösseren und mit grösserem Umfangsabstand voneinander angeordneten Düsenbohrungen 21 des Düsenträgers 18 dienen zur Bildung der in Längsrichtung verlaufenden Stützfäden 10 des Netzes, während die im Querschnitt kleineren, mit geringem Um fangsabstand voneinander angeordneten Düsenbohrungen 22 des Düsenträgers 19 zur Extrusion der in Längs richtung verlaufenden Filterfäden 13 dienen.
Querfäden, und zwar entweder querverlaufende Stützfäden 11 oder querverlaufende Filterfäden 14 werden jeweils dann gebildet, wenn der Düsenträger 18 vom Düsenträger 19 abgehoben ist.
Das erfindungsgemässe Verfahren wird in der Weise durchgeführt, dass der Kern 16 periodisch mit unterschiedlichem Hub und unterschiedlicher Dauer von dem Düsenträger 19 abgehoben wird. In jeder Bewegungsperiode des Kerns 16 wird dieser zwecks Bil- dnng eines querverlaufenden Stützfadens 11 einmal um einen grösseren Betrag und längerzeitig von dem Düsenträger 19 abgehoben, worauf der Kern 16 mehr mals kurzzeitig mit geringem Hub abgehoben wird, so dass jeweils eine Mehrzahl von querverlaufenden Filterfäden 14 kleineren Querschnitts und mit geringem gegenseitigen Abstand gebildet werden.
PATENTANSPRUCH 1
Aus extrudierten Längs- und Querfäden bestehen- des Kunststoff-Filternetz, insbesondere zur Herstellung eines zylindrischen Netzmantels für Filterkerzen, gekennzeichnet durch ein Stützgewebe aus mit Abstand voneinander angeordneten, längs- und querverlaufenden Stützfäden und durch ein die von den Stützfäden frei gelassenen Öffnungen überdeckendes, feinmaschiges Fil tergewebe aus dünneren längs- und querlaufenden Fäden.
UNTERANSPRÜCHE
1. Netz nach Patentanspruch I, dadurch gekennzeichnet, dass das Stützgewebe und das feinmaschige Filtergewebe durch gleichzeitige Herstellung zusammen verbunden und einstückig ausgebildet sind.
2. Netz nach Patentanspruch I oder Unteranspruch 1, dadurch gekennzeichnet, dass die längslaufenden Filterfäden durchgehend extrudiert sind und im Bereich der querlaufenden Stützfäden auf diesen aufliegen.
PATENTANSPRUCH II
Verfahren zur Herstellung von Netzen nach Patentanspruch I, unter Verwendung eines Spritzkopfes, bei dem einerseits durch Extrusion von Material durch in Düsenträgern angeordnete Düsenöffnungen Längsfäden fortlaufend und anderseits Querfäden durch ein relatives Verschieben der Düsenträger gebildet werden, dadurch gekennzeichnet, dass die Düsenträger (18, 19) periodisch mehrmals kurzzeitig und mit geringem. Abstand sowie einmal je Periode längerzeitig und mit grösserem Abstand voneinander abgehoben werden.
**WARNUNG** Ende DESC Feld konnte Anfang CLMS uberlappen**.
A plastic filter net made of extruded longitudinal and transverse threads and a process for its production
The invention relates to a plastic filter net consisting of extruded longitudinal and transverse threads, in particular for producing a cylindrical net portion for filter candles. The invention also relates to a method for producing such a network.
As is well known, plastic nets made of extruded longitudinal and transverse threads are produced in such a way that the longitudinal threads are permanently extruded from nozzle openings of Düsenträ like a spray head, while the transverse threads emerge only from periodically formed or periodically released nozzle slots.
In the device according to German Patent No. 1 109131, a spray head with two nozzle disks which can be moved relative to one another is provided. As long as these nozzle disks are provided with nozzle openings, longitudinal threads are extruded.
The extrusion of transverse threads is possible by lifting the two nozzle disks from one another.
Nets with longitudinal and transverse threads can also be produced with a device in accordance with Auslegeschrift No. 1085 330. Here, too, the longitudinal threads are continuously extruded through corresponding nozzle openings, while transverse nozzle openings provided in a special nozzle carrier are periodically exposed to form the transverse threads.
A spray head is also known from US Pat. No. 3,252,18, in which longitudinal threads are extruded from nozzle bores in nozzle carriers which can be moved relative to one another. Cross threads are formed by temporarily lifting the nozzle carriers from one another. According to one embodiment, the nozzle bores for forming the longitudinal threads can have different dimensions here.
The use of extruded plastic nets in filter technology places special demands on the design of these nets. On the one hand, the filter openings exposed by the threads should be of sufficient fineness in accordance with the intended use of the filter. On the other hand, a certain resistance and dimensional stability are required.
The invention is based on the object of creating networks of extruded plastic threads that are particularly suitable for filter candles and that on the one hand have the desired fineness of the filter openings, but on the other hand also have sufficient dimensional stability for the respective purpose.
The net according to the invention is characterized by a supporting fabric made of spaced longitudinal and transverse supporting threads and a fine-meshed filter fabric of thinner, longitudinal and transverse threads covering the openings left free by the supporting threads.
Such a net is particularly well suited for forming filter jackets from two superimposed extruded plastic nets, of which the coarse-meshed net serves as a support fabric to maintain a certain dimensional stability, while the fine-meshed net acts as a filter fabric. These two superimposed nets are preferably extruded together, with the support fabric being able to be arranged in the preferably continuous fine-meshed filter fabric.
Such a network is produced using an extrusion head, in which, on the one hand, longitudinal threads are continuously formed by extrusion of material through nozzle openings arranged in nozzle carriers and, on the other hand, transverse threads are formed by relative displacement of the nozzle carriers, according to the invention in such a way that the nozzle carriers periodically several times briefly and with small distance as well as elinl times per period longer and with greater distance from each other.
An embodiment of the network around the method according to the invention will be explained in more detail with reference to the drawings. To illustrate it:
Fig. 1 is a section of a filter jacket for a filter candle in the longitudinal section,
FIG. 2 shows a cross section 2-2 of the filter jacket according to FIG. 1,
3 shows a longitudinal section of a spray head in two different positions.
The shown, designed as a mesh tube Fil termantel consists of extruded longitudinal and transverse threads made of plastic. According to the invention, two superimposed nets are provided, namely a coarse-meshed supporting fabric to produce a certain dimensional stability and a close-meshed filter net. The support fabric consists of relatively thick support threads 10 running in the longitudinal direction and transverse support threads 11 of approximately the same size.
The support threads 10 and 11 leave relatively large openings 12 free, which are covered by a fine-meshed filter fabric. Compared to the support threads 10 and 11, the filter fabric consists of much thinner, longitudinally extending filter threads 13 and transversely directed filter threads 14. The longitudinal and transverse filter threads are arranged at small distances from one another, so that there is a close-meshed filter fabric with small openings.
Preferably, at least the filter threads 13 running in the longitudinal direction are continuous over the entire length of the network. As a result, the filter threads 13 running in the longitudinal direction appear on the transverse support threads 11, either on the inside or on the outside as ribs lying close to one another (see in particular FIG. 2).
The filter fabric made of the filter threads 13 and 14 can, as in the illustrated embodiment, be arranged in the radially outer area with respect to the support fabric formed from the support threads 10 and 11. However, the network can also be designed so that the filter fabric is arranged centrally with respect to the cross-sectional dimensions of the support threads 10 and 11 of the support fabric or on the inside of the support fabric.
In Fig. 3, an embodiment of a spray head for the production of nets using the method according to the invention is partially shown in two different positions. The extrusion head consists of an immovable outer jacket 15 and a core 16 arranged coaxially therewith. The core 16 is displaceable with respect to the outer jacket 15 in the axial direction according to arrow 17. In the one, lower end position, a nozzle carrier 18 of the core 16 rests against an opposing nozzle carrier 19 of the outer jacket. In another end position of the core 16, the nozzle carrier 18 is lifted from the nozzle carrier 19 in such a way that a nozzle slot 20 running around it is formed.
The nozzle carriers 18 and 19 are provided with nozzle bores 21 and 22, respectively. These nozzle bores 21 and 22 are always open, that is to say in every position of the core 16, so that plastic is extruded. The larger in cross-section and with a greater circumferential distance from each other nozzle bores 21 of the nozzle carrier 18 are used to form the longitudinally extending support threads 10 of the network, while the smaller in cross-section, with a small circumferential distance from each other nozzle bores 22 of the nozzle carrier 19 for extrusion in the longitudinal direction extending filter threads 13 are used.
Transverse threads, specifically either transverse support threads 11 or transverse filter threads 14, are each formed when the nozzle carrier 18 is lifted from the nozzle carrier 19.
The method according to the invention is carried out in such a way that the core 16 is periodically lifted off the nozzle carrier 19 with different lifts and different durations. In each period of movement of the core 16, it is lifted from the nozzle carrier 19 once by a larger amount and for a longer period in order to form a transverse support thread 11, whereupon the core 16 is lifted several times briefly with a small lift, so that a plurality of transversely running filter threads 14 smaller cross-section and with a small mutual spacing.
PATENT CLAIM 1
Plastic filter net consisting of extruded longitudinal and transverse threads, in particular for the production of a cylindrical net jacket for filter candles, characterized by a support fabric made of spaced-apart, longitudinal and transverse support threads and a fine-meshed mesh covering the openings left free by the support threads Filter fabric made of thinner longitudinal and transverse threads.
SUBCLAIMS
1. Network according to claim I, characterized in that the support fabric and the fine-mesh filter fabric are connected together by simultaneous production and are integrally formed.
2. Network according to claim I or dependent claim 1, characterized in that the longitudinal filter threads are continuously extruded and rest on them in the region of the transverse support threads.
PATENT CLAIM II
Method for producing nets according to claim 1, using an extrusion head, in which, on the one hand, longitudinal threads are formed continuously through the extrusion of material through nozzle openings arranged in nozzle carriers and, on the other hand, transverse threads are formed by relative displacement of the nozzle carriers, characterized in that the nozzle carriers (18, 19 ) periodically several times briefly and with little. Distance as well as once per period longer and with greater distance from each other.
** WARNING ** End of DESC field could overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEN0032121 | 1968-02-14 | ||
CH823768A CH505639A (en) | 1967-06-07 | 1968-06-01 | Plastic gas and liquid filters plastic gas liquid filter |
Publications (1)
Publication Number | Publication Date |
---|---|
CH504885A true CH504885A (en) | 1971-03-31 |
Family
ID=25703009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH1102269A CH504885A (en) | 1968-02-14 | 1968-06-01 | Plastic gas and liquid filters plastic gas liquid filter |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH504885A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010083928A1 (en) * | 2009-01-24 | 2010-07-29 | Mann+Hummel Gmbh | Device and method for producing a tube-shaped filter medium |
WO2011160808A1 (en) * | 2010-06-23 | 2011-12-29 | Hydac Filtertechnik Gmbh | Method for producing a filtering element |
-
1968
- 1968-06-01 CH CH1102269A patent/CH504885A/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010083928A1 (en) * | 2009-01-24 | 2010-07-29 | Mann+Hummel Gmbh | Device and method for producing a tube-shaped filter medium |
WO2011160808A1 (en) * | 2010-06-23 | 2011-12-29 | Hydac Filtertechnik Gmbh | Method for producing a filtering element |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3911826C2 (en) | ||
DE19745381B4 (en) | Filter medium for solid-liquid separation in particular for liquid waste, sewage, etc. | |
DE2629466C2 (en) | Cartridge filter | |
EP0371189B1 (en) | Hollow fibre module, process for its manufacture and apparatus for carrying out said process | |
DE2645634A1 (en) | PIPE FILTER FLOWED FROM THE INSIDE OUT AND THE PROCESS FOR ITS MANUFACTURING | |
EP2665539A1 (en) | Filter element having at least one mat-type or sheet-type filter web | |
DE3337517C2 (en) | Filter element and method for its manufacture | |
DE2900081C2 (en) | Filter for a flowing medium | |
DE2541383A1 (en) | PROCESS FOR MANUFACTURING FILTER BODIES, PREFERABLY HOLLOW FILTER BODIES, FOR GAS OR LIQUID MEDIA | |
DE202006001793U1 (en) | Filter element supporting structure, especially for filter candle of back-flow filter, comprises oppositely threaded helical supporting struts, bonded at crossing sites, extending between open end bushes | |
DE2256489C3 (en) | Filter bags | |
DE2730876A1 (en) | REEL SUPPORT MADE OF ROD-SHAPED SUPPORT ELEMENTS | |
CH504885A (en) | Plastic gas and liquid filters plastic gas liquid filter | |
DE1961543U (en) | FILTER ELEMENT FOR THE TWO-STAGE FILTERING OF FLUIDS. | |
DE4440279A1 (en) | Dust filter insert that can be used at high pressure differentials | |
DE1704878C (en) | Plastic net and method of manufacturing the same | |
DE2227378C3 (en) | Filter set | |
DE1611093C2 (en) | Filter candle | |
DE2322386A1 (en) | Disposable filter cartridge prodn - by winding non woven fibre material on perforated core and compressing with open meshed strands | |
DE1704878B1 (en) | PLASTIC NETS AND METHOD OF MANUFACTURING THE SAME | |
AT287009B (en) | filter | |
DE2608618C3 (en) | Filter cartridge for the treatment of drinking and service water | |
DE2650341B2 (en) | Hollow fiber module | |
DE2905514C2 (en) | Blood filter | |
DE1786125A1 (en) | Backwashable filter cartridge |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PL | Patent ceased |