DE2152463B2 - Device for continuous extrusion sintering - Google Patents

Device for continuous extrusion sintering

Info

Publication number
DE2152463B2
DE2152463B2 DE19712152463 DE2152463A DE2152463B2 DE 2152463 B2 DE2152463 B2 DE 2152463B2 DE 19712152463 DE19712152463 DE 19712152463 DE 2152463 A DE2152463 A DE 2152463A DE 2152463 B2 DE2152463 B2 DE 2152463B2
Authority
DE
Germany
Prior art keywords
tube
rod
heated
sintering
polytetrafluoroethylene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
DE19712152463
Other languages
German (de)
Other versions
DE2152463A1 (en
DE2152463C3 (en
Inventor
Manfred Dipl.-Phys. Cichos
Reimar Prof. Dr.Phil. Pohlmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Priority to BE788881D priority Critical patent/BE788881A/en
Application filed by Individual filed Critical Individual
Priority to DE19712152463 priority patent/DE2152463B2/en
Priority to IT2897072A priority patent/IT967278B/en
Priority to NL7212354A priority patent/NL7212354A/xx
Priority to DD16571872A priority patent/DD99950A5/xx
Priority to JP10512972A priority patent/JPS4851056A/ja
Priority to FR7237335A priority patent/FR2156893A1/en
Publication of DE2152463A1 publication Critical patent/DE2152463A1/en
Publication of DE2152463B2 publication Critical patent/DE2152463B2/en
Application granted granted Critical
Publication of DE2152463C3 publication Critical patent/DE2152463C3/de
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/10—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing sonic or ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/007—Treatment of sinter powders

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (1)

Patentanspruch:Claim: ■»Vorrichtung zum kontinuierlichen Extrusioassinterti eines zyJinderförmigen Stabes sms Pöijietrafluoräthylen-Pulver, mit einem senkrecht verlaufenden, an seinem Umfang mittels Widerstands-Heizelementen beheizbaren Extruderrohr, in 'reichem 5 das Pulver wenigstens bis zum Sintern erwärmbar 1ISt sowie diskontinuierlich mitteis eines auf und ab bewegbaren Preßstempels gepreßt wird und ans dessen von dem Preßstempel abgewandtem unterem Ende der gesinterte Stab pulsierend kontinuierlich austritt, dadurch gekennzeichnet, daß ein Abschnitt des Extruderrohres als Schwingrohr ausgebildet ist. an dessen Umfang Ultraschall-Schwingelemente angeordnet sind, durch die das Schwingrohr in wenigstens annähernd radiale Schwingungen versetzbar ist■ »Device for the continuous extrusion of a cylindrical rod sms Pöijietrafluoroäthylen-Powder, with a vertically running extruder tube that can be heated on its periphery by means of resistance heating elements, in rich 5 the powder can be heated at least until sintering 1 ISt and discontinuously in the middle of an up and down movable Press ram is pressed and at its lower end remote from the press ram, the sintered rod exits pulsating continuously, characterized in that a section of the extruder tube is designed as a vibrating tube. on the circumference of which ultrasonic vibrating elements are arranged, by means of which the vibrating tube can be set in at least approximately radial vibrations Die Erfindung betrifft eine Vorrichtung zum kontinuierlichen Extrusionssintern eines zylinderförmigcn Stabes aus Polytetrafluorethylen-Pulver, mit einem senkrecht verlaufenden, an seinem Umfang mittels Wider-Stands-Heizelementen beheizbaren Extruderrohr, in welchem das Pulver wenigstens bis zum Sintern erwärmbar ist sowie diskontinuierlich mittels eines auf und ab bewegbaren Preßstempels gepreßt wird und aus dessen von dem Preßstempel abgewandtem unterem Ende der gesinterte Stab pulsierend kontinuierlich austritt. The invention relates to a device for the continuous extrusion sintering of a cylindrical rod made of polytetrafluoroethylene powder, with a vertical extending extruder tube, which can be heated on its circumference by means of resistance heating elements, in which the powder can be heated at least until sintering and discontinuously by means of a and is pressed from the movable ram and from the lower one facing away from the ram The end of the sintered rod emerges in a pulsating manner. Bei einer bekannten Vorrichtung dieser Art zum kontinuierlichen Extrusionssintern eines zylinderförmif en Stabes wird die zum Sintern erforderliche Wärme •uf das Polytetrafluoräthylen-Pulver über den Umfang des Extruderrohres mittels Widerstands-Heizelementen übertragen. Hierbei wird das Polytetrafluoräthylen-{ftilver durch einen auf und ab bewegbaren Preßstempel in das senkrecht stehende Extruderrohr gepreßt, das auf einer Länge, von einigen Metern mit Heizmanschetten umgeben Ist Auf dem Weg durch das Extruderrohr wird das Polytetrafluoräthylen aufgeheizt s und gesintert. Wegen der geringen Wärmeleitfähigkeit des Polytetrafluoräthylens ist das Extrusionssintern mit dieser Vorrichtung sehr zeitaufwendig', .*s wird lediglich je nach Durchmesse·' des Stabes ·;.. Vorschub-Geschwindigkeit von etwa Θ.25 bis l.vm/h erreichtIn a known device of this type for the continuous extrusion sintering of a cylindrically shaped In the rod, the heat required for sintering is applied to the polytetrafluoroethylene powder over the circumference of the extruder tube by means of resistance heating elements transfer. Here the polytetrafluoroethylene {ftilver pressed by a ram that can be moved up and down into the vertical extruder tube, over a length of a few meters with heating jackets Is surrounded on the way through the extruder tube, the polytetrafluoroethylene is heated s and sintered. Because of the low thermal conductivity of polytetrafluoroethylene, extrusion sintering is also possible this device is very time-consuming ',. * s only becomes depending on the diameter of the rod; .. feed rate from about Θ.25 to l.vm / h achieved ίο (Zeitschrift »Kunststoffe«. Bd. 59,1969. S. 6521).ίο (“Kunststoffe” magazine. Vol. 59, 1969, p. 6521). Die Aufgabe der Erfindung besteht nun darin, die Extrusionsgeschwindigkeit eines Stabes aus Polytetrafluoräthylen-Pulver merklich zu steigern.
Dies wird erfindungsgemäß dadurch erreicht, daß ein Abschnitt des Betruderrohres ab Schwmgrohr ausgebildet ist, an dessen Umfang Ultraschall-Schwingelemente angeordnet sind, durch die das Schwingrohr in wenigstens annähernd radiale Schwingungen versetzbar istThe object of the invention is to increase the extrusion speed of a rod made of polytetrafluoroethylene powder noticeably.
This is achieved according to the invention in that a section of the impeller tube is formed from the Schwmgrohr, on the circumference of which ultrasonic vibrating elements are arranged, by means of which the vibrating tube can be set in at least approximately radial vibrations Auf diese Weise wird zunächst das Extruderrohr mit Widerstands-Heizelementen erwärmt und damit der zylinderförmige Stabrohling von außen aufgeheizt Zusätzlich wird durch den als Schwingrohr ausgebildeten Abschnitt des Extruderrohrs, an dessen Umfang Ultraschall-Schwingelemente angeordnet sind, die zum Sintern des Innenkerns des Stabrohlings erforderliche Wärme mittels Ultraschallschwingungen erzeugt Am unteren Ende des Extruderrohres tritt der vollständig gesinterte Stab aus Polytetrafluoräthylen aus. jedoch mit merklich größerer Geschwindigkeit als ohne Einsatz der Erwärmung mittels Ultraschall.In this way, the extruder tube is first heated with resistance heating elements and thus the cylindrical rod blank is heated from the outside Section of the extruder tube with ultrasonic vibrating elements on its circumference are arranged, the heat required for sintering the inner core of the rod blank is generated by means of ultrasonic vibrations Am The fully sintered rod made of polytetrafluoroethylene emerges from the lower end of the extruder tube. However with noticeably greater speed than without the use of heating by means of ultrasound. Durch die Vorrichtung wird also das schlechte Wärmeleitvermögen des Polytetrafluoräthylen-Pulvers überspielt und somit die Extrusionsgeschwindigkeit merklich gesteigertThe device thus eliminates the poor thermal conductivity of the polytetrafluoroethylene powder and thus the extrusion speed noticeably increased Die Vorteile wachsen mit zunehmender Dicke des Stabes, da es bei dünnen Stäben durchaus möglich wäre, die äußeren Zonen durch Widerstands-Heizelemente ausreichend zu sintern. Bei dickeren Stäben reicht die Erwärmung vom Umfang her nicht dies ist erst durch die Einwirkung von Ultraschall möglich.The advantages grow with increasing thickness of the rod, since it is quite possible with thin rods would be to sufficiently sinter the outer zones by means of resistance heating elements. For thicker bars If the heating is insufficient, this is only possible through the action of ultrasound.
DE19712152463 1971-10-21 1971-10-21 Device for continuous extrusion sintering Granted DE2152463B2 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE788881D BE788881A (en) 1971-10-21 SINTERING PROCESS OF POWDERED PLASTICS
DE19712152463 DE2152463B2 (en) 1971-10-21 1971-10-21 Device for continuous extrusion sintering
IT2897072A IT967278B (en) 1971-10-21 1972-09-08 PROCEDURE FOR PROCESSING PLASTIC MATERIAL POWDERS TO BE SINTERED
NL7212354A NL7212354A (en) 1971-10-21 1972-09-12
DD16571872A DD99950A5 (en) 1971-10-21 1972-09-18
JP10512972A JPS4851056A (en) 1971-10-21 1972-10-20
FR7237335A FR2156893A1 (en) 1971-10-21 1972-10-20 Plastic moulding - by heating plastic chips using ultrasonic vibrations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712152463 DE2152463B2 (en) 1971-10-21 1971-10-21 Device for continuous extrusion sintering

Publications (3)

Publication Number Publication Date
DE2152463A1 DE2152463A1 (en) 1973-05-10
DE2152463B2 true DE2152463B2 (en) 1975-01-02
DE2152463C3 DE2152463C3 (en) 1975-08-21

Family

ID=5823007

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712152463 Granted DE2152463B2 (en) 1971-10-21 1971-10-21 Device for continuous extrusion sintering

Country Status (7)

Country Link
JP (1) JPS4851056A (en)
BE (1) BE788881A (en)
DD (1) DD99950A5 (en)
DE (1) DE2152463B2 (en)
FR (1) FR2156893A1 (en)
IT (1) IT967278B (en)
NL (1) NL7212354A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303998A1 (en) * 1987-08-17 1989-02-22 The B.F. Goodrich Company Shear processing thermoplastics in the presence of ultrasonic vibration

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61181630A (en) * 1985-02-07 1986-08-14 Beishin Kogyo Kk Method of molding powdery particle
FR2657291B1 (en) * 1990-01-23 1992-05-15 Dias Ind Sarl PROCESS FOR THE MANUFACTURE OF A COMPOSITE MATERIAL COMPRISING THE MIXTURE OF AT LEAST TWO COMPONENTS AND COMPOSITE MATERIAL OBTAINED.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0303998A1 (en) * 1987-08-17 1989-02-22 The B.F. Goodrich Company Shear processing thermoplastics in the presence of ultrasonic vibration

Also Published As

Publication number Publication date
DD99950A5 (en) 1973-09-05
BE788881A (en) 1973-01-02
FR2156893A1 (en) 1973-06-01
JPS4851056A (en) 1973-07-18
NL7212354A (en) 1973-04-25
IT967278B (en) 1974-02-28
DE2152463A1 (en) 1973-05-10
DE2152463C3 (en) 1975-08-21

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Legal Events

Date Code Title Description
C3 Grant after two publication steps (3rd publication)