NL8100672A - Samengesteld polytetrafluoretheen voortbrengsel en een werkwijze ter vervaardiging ervan. - Google Patents
Samengesteld polytetrafluoretheen voortbrengsel en een werkwijze ter vervaardiging ervan. Download PDFInfo
- Publication number
- NL8100672A NL8100672A NL8100672A NL8100672A NL8100672A NL 8100672 A NL8100672 A NL 8100672A NL 8100672 A NL8100672 A NL 8100672A NL 8100672 A NL8100672 A NL 8100672A NL 8100672 A NL8100672 A NL 8100672A
- Authority
- NL
- Netherlands
- Prior art keywords
- segments
- microstructure
- composite
- foamed
- seam
- Prior art date
Links
- 239000002131 composite material Substances 0.000 title claims description 9
- 238000004519 manufacturing process Methods 0.000 title description 7
- 238000000034 method Methods 0.000 claims description 13
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 238000005304 joining Methods 0.000 claims description 3
- 230000000452 restraining effect Effects 0.000 claims 1
- 238000001000 micrograph Methods 0.000 description 7
- 101000606535 Homo sapiens Receptor-type tyrosine-protein phosphatase epsilon Proteins 0.000 description 4
- 102100039665 Receptor-type tyrosine-protein phosphatase epsilon Human genes 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical class [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical class [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007631 vascular surgery Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
- C08J5/121—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives by heating
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
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- B29C53/36—Bending and joining, e.g. for making hollow articles
- B29C53/38—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges
- B29C53/385—Bending and joining, e.g. for making hollow articles by bending sheets or strips at right angles to the longitudinal axis of the article being formed and joining the edges using several sheets to form the circumference
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/006—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor the force created by the liberation of the internal stresses being used for compression moulding or for pressing preformed material
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
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- B29C65/022—Particular heating or welding methods not otherwise provided for
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C65/82—Testing the joint
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
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- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B29C66/49—Internally supporting the, e.g. tubular, article during joining
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- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/80—General aspects of machine operations or constructions and parts thereof
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
- B29C66/7371—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable
- B29C66/73711—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined oriented or heat-shrinkable oriented
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- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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- B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
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- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
- Y10T428/1331—Single layer [continuous layer]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/19—Sheets or webs edge spliced or joined
- Y10T428/192—Sheets or webs coplanar
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Public Health (AREA)
- Manufacturing & Machinery (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- Veterinary Medicine (AREA)
- Gastroenterology & Hepatology (AREA)
- Cardiology (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Toxicology (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Prostheses (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Laminated Bodies (AREA)
Description
-1- ΪΓ.Ο. 29817
Samengesteld polytetrafluoretheen voortbrengsel en een werkwijze ter vervaardiging ervanl
De onderhavige uitvinding heeft betrekking op een werkwijze voor de vervaardiging van een nieuw samengesteld voortbrengsel van opgeschuimd polytetrafluoretheen.
Polytetrafluoretheen (hierna ,,PTPE") heeft een uitsteken-5 de bestandheid tegen hitte, bestandheid tegen chemicaliën, isolatie-weerstand, niet klevend vermogen en zelfsmering. Dit polymeer heeft ruime toepassing gevonden op medisch, industrieel en recreatief gebied.
Ben recente uitvinding (Amerikaans octrooischrift 10 3·953·566) vermeldt een werkwijze voor de vervaardiging van sterk poreuze, gevormde PIPE voortbrengsels met toch een grote sterkte. Deze werkwijze omvat het mengen van sterk kristallijn, fijn PT1E-poeder met een vloeibaar smeermiddel, het extruderen van dit mengsel door een mondstuk, dat de gewenste dwarsdoorsnedeconfiguratie kan 15 hebben en het daarop volgende opschuimen van het gevormde voortbrengsel in een -of meer richtingen met snelheden van meer dan 10% per seconde.
Produkten voortgebracht door deze werkwijze hebben een ruim verbreide aanvaarding gevonden in de industriële, medische, 20 elektrische en kledingteehniek. De werkwijze is enigszins beperkt, doordat deze niet gemakkelijk aan te passen is voor de vervaardiging van grote voortbrengsels met complexe dwarsdoorsneden. De behoefte aan dergelijke voortbrengsels wordt bijvoorbeeld aangetroffen in de techniek van industriële filtratie en vaatchirurgie bij grote vaten. 25 Hoewel dergelijke samengestelde voortbrengsels vervaardigd kunnen worden door vereniging van kleinere voortbrengsels met elkaar door gebruikelijke methoden zoals zagen, lassen of lijmen hebben dergelijke voortbrengsels een onderbreking bij de naad. Terwijl dit bij vele toepassingen geen ernstige problemen geeft, is het bij andere 30 toepassingen zoals filtratie en vervanging van lichaamsdelen uiterst belangrijk, dat de struktuur zo homogeen mogelijk is over het gehele voortbrengsel. Wanneer lassen of lijmen toegepas?*voor de vervaardiging van grote voortbrengsels wordt een dicht niet poreus gebied voortgebracht. Anderzijds kan zagen gebieden vóórtbrengen, die een 35 grotere poreusheid hebben dan de rest van het voortbrengsel. Gebleken is, dat de miero-struktuur van knopen en fibrillen aanwezig in produkten voortgebracht volgens het Amerikaanse octrooischrift 3.953.566 bijzonder wenselijk is als zowel een filtermedium als een 81 006 7 2 -2 oppervlak voor het in kontakt brengen van bloed en andere lichaamsvloeistoffen. Het zou daarom wenselijk zijn samengestelde, complexe vormen voort te brengen door voortbrengsels van opgeschuimd PTPE met deze micro-struktuur op een zodanige wijze te verenigen, dat de 5 micro-struktuur in hoofdzaak ononderbroken blijft over de verbinding of naad.
Een oogmerk van de onderhavige uitvinding is een werkwijze ter vervaardiging van een samengesteld, gevormd, PTEE-voortbrengsel. Een dergelijk voortbrengsel wordt voortgebracht door vereniging 10 van segmenten van voortbrengsels met kleinere vorm. Deze kleinere segmenten worden dicht tegen elkaar gehouden en hun temperatuur wordt verhoogd tot een temperatuur boven het kristallijne smeltpunt van de segmenten. Zij worden vervolgens tot omgevingstemperatuur gekoeld om de hantering van het voortbrengsel te vergemakke-15 lijken. Een verder oogmerk van de onderhavige uitvinding is de vervaardiging van een samengesteld, gevormd, PTPE-voortbrengsel door de hiervoor vermelde werkwijze, met een in hoofdzaak ononderbroken micro-struktuur van knopen, die onderling verbonden zijn door fi-brillen over de verbinding.
20 korte beschrijving van de tekeningen.
Pig. 1 is een schematische voorstelling van een van de uitvoeringsvormen van de onderhavige uitvinding.
Pig. 2-4(b) zijn eleetromicro foto's van verschillende oppervlakken van een buis vervaardigd volgens de onderhavige uit-25 vinding. '
De binding van PIPE met PIPE door mechanisch de twee onderdelen in kontakt te houden en deze te verhitten boven het kristallijne smeltpunt van PIPE is in de techniek bekend. In het algemeen heeft dit echter geresulteerd in een vaste niet poreuze 30 naad. De onderhavige uitvinding past een modificatie van de werkwijze toe voor het voort brengen van een produkt, waarin de knoop-fibril microstruktuur aanwezig in beide onderdelen vrijwel ononderbroken over de naad gehandhaafd wordt. Het resultaat is dat een naadvrij produkt wordt voortgebracht. In de onderhavige context 35 wordt de uitdrukking "randen" gebruikt om dat gedeelte van het opgeschuimde PIPE voortbrengsel aan te geven, dat verenigd dient te worden en "naad" wijst op het aldus gebonden gebied. Voortbrengsels hebben betrekking op elke gevormde dwarsdoorsnede, bijvoorbeeld buis, staaf, vel of segment.
40 PIPE materiaal is beschikbaar in verschillende vormen, -81 006 7 2 -3- met inbegrip van vellen, staven en "buizen van W.L.Gore &
Associates, Ino. De te vertinden voortbrengsels worden tot de vereiste afmeting gesneden. Er dient voor gezorgd te worden, dat de te verenigen randen schoon zijn, dat wil zeggen noch gerafeld noch 5 vuil. De twee randen worden vervolgens in gesloten nabijheid geplaatst, d.w.z. rakend aan elkaar.
Vanneer opgeschuimd ΡΈΡΕ boven het kristallijne smeltpunt ervan verhit wordt terwijl het niet onder spanning is, zal het materiaal de neiging hebben te krimpen en te coalesceren tot een 10 vaste massa. Teneinde derhalve te waarborgen, dat de twee met elkaar te verbinden voortbrengsels in kontakt blijven terwijl zij verhit worden, dienen mechanische middelen te worden toegepast om ze zo te houden.
Zoals bijvoorbeeld toegelicht in fig. 1 kan een grote 15 buis vervaardigd worden uit vellen of secties van een aantal kleinere buizen. De vellen 4 worden bij hun randen 6(a) en 6(b) afgesneden teneinde ervoor te zorgen dat deze randen schoon zijn, d.w.z. niet rafelig of vuil. De vellen 4 worden vervolgens rond een doorn 2 gelegd. De randen 6(a) en 6(b) van elk vel 4 worden nauw grenzend aan 20 elkaar geplaatst op de randen 6(a) en 6(b) van het aangrenzende vel. De einden van de vellen A en B worden bij deze punten op de doom bevestigd. Dit kan bereikt worden op verschillende manieren, zoals buisklemmen of het binden van de vellen op de doorn door draad. De reden om de buis aldus te bevestigen is het voorkomen van terugtrek-25 king in de lengterichting van het PIPE bij verhitting.
Een strook opgeschuimde PTEE film met een breedte van ongeveer 19 mm en met een matrix treksterkte in lengterichting van ongeveer 490000 kpa wordt spiraalsgewijze gewikkeld rond de vellen op de doom en aan het einde van de doom vastgemaakt zodat het deze 50 niet kan afwikkelen. Na verhitting krimpt deze opsluitende film, waarbij druk op de vellen wordt toegepast en de randen 6(a) en 6(b) in nauw kontakt worden'gehouden. Een bevredigende film is in de handel verkrijgbaar als G0EE-TEX opgeschuimd filament van W.L.Gore & Associates, Inc. P.0. Box 1220, Elkton, Maryland 29121, Hoewel wik-55 keling met een opgeschuimde PIPE film een voorkeursmiddel is voor het mechanisch opsluiten en vasthouden van de randen van de vellen in kontakt tijdens de verhitting kunnen andere middelen worden gebruikt.
De belangrijke factor is, dat er enige kracht loodrecht 40 op de naad tijdens het sinteren moet zijn. Wanneer de film, gewik- - 8 i 0 0 6 7 2 -4- keld rond de buis, samentrekt zorgt deze voor de noodzakelijke, kracht.
De verhitting van de gewikkelde huis kan bereikt worden in een zoutbad, een luchtoven, een stralingsoven of andere verhit-5 tingsmiddelen. Een geschikt zoutbad kan een gesmolten mengsel van natriumnitrieten en natriumnitraten zijn en wordt gehandhaafd op een temperatuur boven het kristallijne smeltpunt van de segmenten.
De buis wordt vervolgens verwijderd en gekoeld, terwijl deze nog steeds wordt opgesloten. De tijdsduur boven het kristallijne smelt-10 punt zal variëren afhankelijk van de betrokken materiaalmassa en de harseigenschappen. De juiste tijd voor het voortbrengen van een optimum binding zal afhangen van een aantal faktoren zoals de materiaalmassa en de configuratie van de te vervaardigen vorm. Een dergelijie tijd wordt echter gemakkelijk bepaald met een minimum 15 aan experimenteren. Het volgende voorbeeld is bestemd om de onderhavige uitvinding toe te lichten en niet te beperken. De techniek kan gebruikt worden bij alle vormen en afmetingen, waar het belangrijk is een nagenoeg ononderbroken micro struktuur over elke verbindingslijn- of naad te handhaven.
20 Voorbeeld I.
Drie segmenten van 120° van 6,5 cm werden gesneden uit buizen met een inwendige diameter van 20 mm, die vervaardigd waren volgens de leer van het Amerikaanse octrooischrift 3»953.566· De gebruikte hars was Pluon 123, die een fijne poedervormige PTPE hars 25 is in de handel verkrijgbaar bij ICI America. Deze segmenten werden zorgvuldig afgesneden om ervoor te zorgen dat de aan elkaar grenzende randen schoon waren. De segmenten werden vervolgens voorzichtig rond een gladde roestvrij stalen buis met een uitwendige diameter van 20 mm gelegd* De segmenten werden zodanig opgesteld, dat zij 30 rauw aan elkaar grensden. Zij werden vervolgens spiraalsgewijze om-wikkeld met een 19 mm breedte opgeschuimde PIPE film met een matrix treksterkte van ongeveer 490000 kpa, die vervaardigd was volgens het Amerikaanse octrooischrift 3*962.153·
De doorn werd vervolgens 12 minuten bij 380°C in een 55 luchtoven geplaatst. Ha verwijdering uit de luchtoven werd de doorn tot omgevingstemperatuur gekoeld en de gevormde PIPE buis werd voor-zichting van de doorn geschoven. Toor het doel van deze proef werd de omwikkelingsfilm voorzichtig van de buis verwijderd teneinde een microfoto van de struktuur1 bij de naad te maken.
40
Pig. 2 is een hoekige electromicrofoto van een van de 8100672 -5- naden vervaardigd "bij voorbeeld I. Het bovengedeelte 10 is een topografisch aanzicht van het inwendige oppervlak van de buis. Het onderste deel 12 is een dwarsdoorsnedeaanzicht van de buis. In fig. 2 loopt de naad van X tot Y. De vergroting is 146 maal.
5 Eig. 5(a) is een electromicrofoto van het inwendige op pervlak van de buis vervaardigd bij voorbeeld I. De naad loopt van X tot Y. De vergroting is 122 maal. Eig. 5(b) is een electromicrofoto van het in fig. 3(a) opgenomen oppervlak. De naad loopt van X tot Y en de vergroting is 610 maal.
Ί0 Eig. 4(a) is een electromicrofoto van het uitwendige oppervlak na verwijdering van de film van de in voorbeeld I vervaardigde buis. De naad looptvan X tot Y en de vergroting is 90 maal. Eig. 4(¾) is een electromicrofoto van het in fig. 4(a) getoonde opgenomen gebied. De naad loopt van X tot Y en de vergroting is 450 15 maal.
Uit deze electromicrofoto's is het verrassend waar te nemen, dat de knoop- fibrilmicrostruktuur nagenoeg ononderbroken is over de naad. Hoewel een monster op kleine schaal gebruikt werd om de onderhavige uitvinding toe te lichten, kan deze techniek gemak-20 kelijk worden uitgebreid om grotere buisen met een diameter van enkele centimeters te omvatten. Op gelijke wijze kan de techniek gebruikt worden met allerlei verschillende vormen en is niet beperkt tot buisvormige dwarsdoorsneden. Bijvoorbeeld kunnen vellen van in één richting opgeschuimd PTEE met dikten die variëren van 25 ongeveer 0,125 mm tot 2,5 nm op de volgende wijze met elkaar verenigd worden. Sluit de PTEE vellen op in de richting van hun uitzetting, plaatst ze grenzend tussen 1,6 mm dikke vellen van siliconenrubber van 60 durometer (2 vellen rubber aan elke kant van het PTEE, die niet geheel grenzend zijn aan elkaar met een opening van 30 ongeveer 0,25 mm ertussen, die correspondeert met de naad in de PTEE vellen ) en plaatst de PTEE en rubber vellen in een pers met platen die tot ongeveer 380°C zijn verhit. De pers kan worden gesloten om een zeer kleine druk toe te passen op de vellen, die op de rubber zitten. Dit zal de noodzakelijke loodrechte kracht op de naad 33 geven, die deze keer in een vlakke configuratie is. Ha een geschikte tijd, ongeveer 15 minuten, kunnen de electrische verhitters op de' pers worden uitgeschakeld en kunnen de platen gekoeld worden met een stroom gecomprimeerde lucht. Wanneer de platen zijn gekoeld tot kamertemperatuur wordt de pers opengemaakt en worden de vellen ver-40 wijderd.
8100672
Claims (4)
1. Werkwijze voor het verenigen van een veelvoud polytetra-fluoretheensegmenten elk met een microstructuur van knopen onderling verbonden door fibrillen op een zodanige wijze, dat de microstructuur nagenoeg ononderbroken .is bij de verbinding, met 5 het kenmerk, dat men (a) de segmenten met mechanische middelen in nauw contact houdt, (b) de segmenten tegen krimpeni .in elke richting weerhoudt, (c) de segmenten, terwijl d:eze aldus worden gehouden, ver-10 hit tot een temperatuur boven het kristallijne smelpunt van de segmenten gedurende een vooraf ..bepaalde tijd en (d) de segmenten laat koelen beneden het kristallijne smeltpunt van de segmenten, terwijl deze in nauw kontakt worden gehouden .
2. Werkwijze volgens conclusie 1, met het ken merk, dat men (a) de segmenten rond een doorn nauwkeurig aan elkaar doet grenzen en (b) spiraalgewijze deze lagen omwikkelt met een opgeschuimde 20 ΡΤΙΈ film met grote sterkte.
3· Samengesteld PTFE voortbrengsel vervaardigd volgens conclusie 1.
4· Gelast samengesteld ΡΤΙΈ product, dat een veelvoud opgeschuimde ΡΤΙΈ segmenten bevat met een microstructuur van knopen 25 onderling verbonden?door fibrellen, welke microstructuur in hoofdzaak ononderbroken is bij de las. 1 81 006 7 2
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12136580 | 1980-02-14 | ||
US06/121,365 US4283448A (en) | 1980-02-14 | 1980-02-14 | Composite polytetrafluoroethylene article and a process for making the same |
Publications (3)
Publication Number | Publication Date |
---|---|
NL8100672A true NL8100672A (nl) | 1981-09-16 |
NL185906B NL185906B (nl) | 1990-03-16 |
NL185906C NL185906C (nl) | 1990-08-16 |
Family
ID=22396215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NLAANVRAGE8100672,A NL185906C (nl) | 1980-02-14 | 1981-02-12 | Werkwijze voor het aan elkaar lassen van een veelvoud van polytetrafluoretheensegmenten en samengesteld voortbrengsel daaruit. |
Country Status (20)
Country | Link |
---|---|
US (1) | US4283448A (nl) |
JP (1) | JPS5746835A (nl) |
AT (1) | AT386416B (nl) |
AU (1) | AU541290B2 (nl) |
BE (1) | BE887501A (nl) |
BR (1) | BR8100852A (nl) |
CA (1) | CA1165080A (nl) |
CH (1) | CH652072A5 (nl) |
DE (2) | DE3153231C2 (nl) |
DK (1) | DK156419C (nl) |
FI (1) | FI72920C (nl) |
FR (1) | FR2475974B1 (nl) |
GB (1) | GB2068827B (nl) |
GR (1) | GR73849B (nl) |
IN (1) | IN155688B (nl) |
IT (1) | IT1135417B (nl) |
NL (1) | NL185906C (nl) |
NO (1) | NO810506L (nl) |
SE (1) | SE448968B (nl) |
ZA (1) | ZA81678B (nl) |
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US9814560B2 (en) | 2013-12-05 | 2017-11-14 | W. L. Gore & Associates, Inc. | Tapered implantable device and methods for making such devices |
AU2016270380B2 (en) | 2015-06-05 | 2019-04-04 | W. L. Gore & Associates, Inc. | A low bleed implantable prosthesis with a taper |
US10413635B2 (en) * | 2015-08-17 | 2019-09-17 | Vivex Biomedical, Inc. | Umbilical cord transplant product |
US11378214B2 (en) | 2020-06-26 | 2022-07-05 | Lawrence Wolf | Coaxial tubing systems with securable spacers |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US612897A (en) * | 1898-10-25 | Construction of tubes and cylinders | ||
US3207644A (en) * | 1959-07-20 | 1965-09-21 | Garlock Inc | Method of making a fluorocarbon resin jacketed gasket |
US3356551A (en) * | 1961-08-21 | 1967-12-05 | Martin Marietta Corp | Method of joining bodies of polytetrafluoroethylene |
CA962021A (en) * | 1970-05-21 | 1975-02-04 | Robert W. Gore | Porous products and process therefor |
US3767500A (en) * | 1971-12-28 | 1973-10-23 | Tme Corp | Method of laminating long strips of various materials |
US4061517A (en) * | 1975-08-27 | 1977-12-06 | Chemelec Products, Inc. | Method of making fluorocarbon resin covered gaskets |
DE2549475C3 (de) * | 1975-11-05 | 1979-04-19 | Sigri Elektrographit Gmbh, 8901 Meitingen | Verfahren und Vorrichtung zum Verbinden von Formkörpern aus PoIytetrafluoräthylen |
-
1980
- 1980-02-14 US US06/121,365 patent/US4283448A/en not_active Expired - Lifetime
-
1981
- 1981-01-23 SE SE8100407A patent/SE448968B/sv not_active IP Right Cessation
- 1981-02-02 ZA ZA00810678A patent/ZA81678B/xx unknown
- 1981-02-05 DE DE3153231A patent/DE3153231C2/de not_active Expired
- 1981-02-05 GB GB8103585A patent/GB2068827B/en not_active Expired
- 1981-02-05 DE DE3104037A patent/DE3104037C2/de not_active Expired
- 1981-02-10 CH CH888/81A patent/CH652072A5/de not_active IP Right Cessation
- 1981-02-10 AU AU67146/81A patent/AU541290B2/en not_active Ceased
- 1981-02-11 IT IT19659/81A patent/IT1135417B/it active
- 1981-02-12 NL NLAANVRAGE8100672,A patent/NL185906C/nl not_active IP Right Cessation
- 1981-02-12 BR BR8100852A patent/BR8100852A/pt unknown
- 1981-02-12 BE BE0/203784A patent/BE887501A/fr unknown
- 1981-02-12 GR GR64113A patent/GR73849B/el unknown
- 1981-02-13 CA CA000370903A patent/CA1165080A/en not_active Expired
- 1981-02-13 FI FI810449A patent/FI72920C/fi not_active IP Right Cessation
- 1981-02-13 JP JP56019161A patent/JPS5746835A/ja active Granted
- 1981-02-13 NO NO810506A patent/NO810506L/no unknown
- 1981-02-13 IN IN167/CAL/81A patent/IN155688B/en unknown
- 1981-02-13 FR FR8102848A patent/FR2475974B1/fr not_active Expired
- 1981-02-13 DK DK063581A patent/DK156419C/da not_active IP Right Cessation
- 1981-02-16 AT AT0071181A patent/AT386416B/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FI72920B (fi) | 1987-04-30 |
CA1165080A (en) | 1984-04-10 |
DK63581A (da) | 1981-08-15 |
SE8100407L (sv) | 1981-08-15 |
GB2068827B (en) | 1983-09-21 |
US4283448A (en) | 1981-08-11 |
BE887501A (fr) | 1981-06-01 |
ATA71181A (de) | 1988-01-15 |
BR8100852A (pt) | 1981-08-25 |
DE3104037C2 (de) | 1986-02-27 |
AU6714681A (en) | 1981-08-20 |
IT1135417B (it) | 1986-08-20 |
ZA81678B (en) | 1982-03-31 |
AU541290B2 (en) | 1985-01-03 |
FR2475974A1 (fr) | 1981-08-21 |
NL185906C (nl) | 1990-08-16 |
NO810506L (no) | 1981-08-17 |
SE448968B (sv) | 1987-03-30 |
FI810449L (fi) | 1981-08-15 |
IN155688B (nl) | 1985-02-23 |
GR73849B (nl) | 1984-05-07 |
JPS6315904B2 (nl) | 1988-04-06 |
DE3104037A1 (de) | 1981-12-24 |
DK156419B (da) | 1989-08-21 |
CH652072A5 (de) | 1985-10-31 |
DE3153231C2 (nl) | 1987-05-21 |
IT8119659A0 (it) | 1981-02-11 |
DK156419C (da) | 1990-01-22 |
GB2068827A (en) | 1981-08-19 |
FI72920C (fi) | 1987-08-10 |
FR2475974B1 (fr) | 1985-06-21 |
JPS5746835A (en) | 1982-03-17 |
AT386416B (de) | 1988-08-25 |
NL185906B (nl) | 1990-03-16 |
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