DE1704219A1 - Device and method for ultrasonic welding of plastic parts - Google Patents

Device and method for ultrasonic welding of plastic parts

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Publication number
DE1704219A1
DE1704219A1 DE19671704219 DE1704219A DE1704219A1 DE 1704219 A1 DE1704219 A1 DE 1704219A1 DE 19671704219 DE19671704219 DE 19671704219 DE 1704219 A DE1704219 A DE 1704219A DE 1704219 A1 DE1704219 A1 DE 1704219A1
Authority
DE
Germany
Prior art keywords
feed
piston
sonotrode
cylinder
brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE19671704219
Other languages
German (de)
Inventor
Wilmar Hartmann
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.)
DR LEHFELDT AND CO GmbH
Original Assignee
DR LEHFELDT AND CO 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 DR LEHFELDT AND CO GmbH filed Critical DR LEHFELDT AND CO GmbH
Publication of DE1704219A1 publication Critical patent/DE1704219A1/en
Pending legal-status Critical Current

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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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/924—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9241—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force, the mechanical power or the displacement of the joining tools by controlling or regulating the pressure, the force or the mechanical power
    • 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
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-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
    • B29C66/70—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
    • B29C66/739—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 material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—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 material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics

Description

Vorrichtung und Verfahren zur Ultraschall-Schwei#ung von Kunststoffteilen. Device and method for ultrasonic welding of plastic parts.

Die Erfindung betrifft eine Vorrichtung zur Ultraschnlls chweißung von Kunststoffteilen mittels eines mit einer Sonotrode verbundenen Ultraschallgebers und einer durch Hilfskraft betriebenen Vorschubvorrichtung durch die das Werkstück und die Sonotrode zusammengeführt und unter Pressdruck gesetzt werden. Verwendet man bei einer solchen Ultraschall-Schwei#vorrichtung eine zur Erzeugung des Pressdruckes ausreichende Vorschubkraft, dann setzt die Sonotrode mit relativ großer Vorschubgeschwindigkeit hart auf das Werkstücke auf und es entsteht ein steil ansteigender Presadruck.The invention relates to a device for ultrasonic welding of plastic parts by means of an ultrasonic transducer connected to a sonotrode and a power feeding device through which the workpiece is fed and the sonotrode are brought together and placed under pressure. Used With such an ultrasonic welding device, one is used to generate the pressing pressure sufficient feed force, then the sonotrode sets at a relatively high feed rate hard on the work piece and there is a steeply increasing pre-pressure.

Das ist für viele empfindliche Werkstücke unzuträglich und führt häufig zu einer Zerstörung oder zu uvollkommenen Schwei#verbindungen. Insbesondere, wenn Netallteile unter Ultraschalleinwirkung in ein Kunststoffteil eingepresst werden sollen, führt ein hartes Aufsetzen der Sonotrode bei großer Vorschubgeschwindigkeit zu Mi#erfolgen. Zur Vermeidung dieaer Nachteile ist erfindungsgemäß die Vorschubvorrichtung mit einer hydraulischen, aus Kolben und Zylinder bestehenden Bremse verbunden, durch die die Vorschubgeschwindigkeit und/oder der Pressdruck nach einem vorbestimmbaren Vorschubweg in einstellbarer Weise herabsetzbar ist. Durch die Anwendung einer solchen hydraulischen Bremse wird es möglich, auoh bei relativ großer Vorschubkraft, ein weiches, schleichendes Aufsetzen der Sonotrode zu erreicheii und eine langeame Entwicklung des Pressdruckes zu ermöglichen.This is unsuitable for many sensitive workpieces and often leads destruction or imperfect welds. Especially when Metal parts are pressed into a plastic part under the action of ultrasound should, results in a hard placement of the sonotrode at a high feed rate to be done on Wed #. In order to avoid these disadvantages, the feed device is according to the invention connected to a hydraulic brake consisting of piston and cylinder the feed rate and / or the pressing pressure according to a predeterminable Feed path can be reduced in an adjustable manner. By applying such a hydraulic brake it becomes possible, even with a relatively large feed force soft, creeping placement of the sonotrode and a long development to enable the pressing pressure.

Üblicherweise ist ein pneumatischer Vorschubzylinder und -kolben für das aus Ultraschallgeber und Sonotrode bestehende Aggregat vorgesehen. Bei einer solchen Vorrichtung wird die Erfindung zweckmäßigerweise dadurch verwirklicht, daß mit den Vorschubzylinder ein mit einem einstellbaren Umgang versehener hydraulischer Bremazylinder verbunden ist und daß ein vom Kolben des Vorschubzylinders bewegtes über dem Vorschubeylinder liegendes Joch an der Kolbenstange des Bremskolbens zwischen einstellbaren Mitnahmegliedern (Stellgliedern) angreift. Dabei wird vermieden, daß durch die Bremse schädliche Kippkräfte auf die Sonotrode ausgeübt werden. Common is a pneumatic feed cylinder and piston intended for the unit consisting of the ultrasonic transducer and sonotrode. At a such device, the invention is expediently implemented in that with the feed cylinder a hydraulic one provided with an adjustable handle Brake cylinder is connected and that one moved by the piston of the feed cylinder yoke located above the feed cylinder on the piston rod of the brake piston between adjustable driving members (actuators) attacks. It is avoided that harmful tilting forces are exerted on the sonotrode by the brake.

Zweckmäßigerweise ist das Joch einseitig schwenkbar gelagert und mit dem Vorschubkolben durch eine einen Leerhub des Vorschubkolbens zulassende Mitnahmevorrichtung gekuppelt. Dann kann ein relativ langer Vorschubweg vorgesehen werden, wahrend das auf die Bremse wirkende Joch zun4chst in Ruhe bleibt und erst am Ende des Vorschubweges mitgenommen wird. The yoke is expediently mounted and pivotable on one side with the feed piston by a driving device that allows an idle stroke of the feed piston coupled. A relatively long feed path can then be provided during the The yoke acting on the brake initially remains at rest and only at the end of the feed path is taken.

Die Erfindung betrifft ferner ein Verfahren zum Ultraschallschweissen von Kunststoffteilen, daß erst durch die geschilderte Vorrichtung ermöglicht wird. Dieses Verfahren besteht erfindungsgemäß darin, daß der Vorschub der Sonotrode unmittelbar vor oder beim Aufsetzen der Sonotrode auf das Werkstück derart abgebremst wird, daß eine Ultraschalleinwirkung auf das Werkstück bei stark vermindertel Pressdruck erfolgt und daß sich der Pressdruck nach einer durch die Bremse einstellbaren Charakteristik vergrößert. Dadurch wird es möglich, das Kanststoffmaterial durch Ultraschalleinwirkung erst aufzuweichen und dann erst nach dem Erreichen eines geeigneten Zustandes das ein - oder anzuschweißende Teil durch verstärkten Pressdruck in innige Verbindung zu bringen. The invention also relates to a method for ultrasonic welding of plastic parts that is only made possible by the device described. According to the invention, this method consists in that the advance of the sonotrode is immediate before or when placing the sonotrode on the workpiece is braked in such a way that that an ultrasonic effect on the workpiece with greatly reduced pressure takes place and that the pressing pressure according to a characteristic adjustable by the brake enlarged. This makes it possible to remove the plastic material by the action of ultrasound first soften and then only after reaching a suitable state that Part to be welded in or to be welded on by means of increased pressure in an intimate connection bring to.

Im folgenden ist unter Bezugnahme auf die schematische Abbildung eine nach der Erfindung ausgebildete Vorrichtung naher erläutert.With reference to the schematic figure, the following is a trained according to the invention device explained in more detail.

An einem Maschinenholm 1 ist ein pneumatisch betriebener Yorschubzylinder 2 befestigt, dessen Kolben 3 einen nicht dargestellten Ultraschallgeber und eine damit verbundene Sonotrode 4 trägt. Mit dem Kolben 3 ist ein vertikal geführtes Verbindungsglied 5 verbunden, das einen gabelförnLigen Mitnehmer6trägt, der einen Mitnehmerstift 6'aufweist. Zwischen den Gabelachenkeln des Mitnehmers 6 befindet sich ein Joch 7 mit einem langloch 7', in dem der Nltnehmerstift 6' gleitet Das Joch 7 ist an einem Lagerträger 8 schwenkbar gelagert, der am Maschinenholm 1 fest angeschraubt ist. Am Vorschubzylinder 2 ist ein hydraulischer Bremszylinder 9 befestigt, in dem ein mit einer Kolbenstange 1Oversehener Bremskolben 11 gleitet und in bekannter, nicht dargestellter Weise, Flüssigkeit von einer Zylinderkammer über einen Umgang in die andere Zylinderkammer verdrängt. Die dadurch erzielte Bremswirkung ist in bekannter Weise dadurch Einstellung eines drosselnden Nadelventile im Umgang fein einstellbar. Die Kolbenstange 10 ist durch ein am freien. Ende des Joches 7 sitzendes Auge 12 hindurchgeführt. Zwei auf der Kolbenstange 10 einstellbar angebrachte Stellringe 13, 14 dienen als Mitnahmeanschläge. Wenn durch Einschalten einer pneumatischen Hilfskraft der Vorschubkelben 3 im Vorschubzylinder 2 nach unten gedrüc kt und damit die Sonotrode 4 dem nicht dargestellten Werkstück genähert wird, gleitet zunächst der IIitnehmerstift 6' im Langloch 7' des Joches 7. Ehe die Sonotrode 4 uuf dem ferkstUck aufsitzt, ist der mitnehmerstift 6' am unteren Ende des Langloches 71 angekommen, sodaß nunmehr das Joch 7 mitgenommen wird. Sobald das Auge 12 des Joches 7 auf dem Stellring 14 zur Auflage kommt, setzt die Wirkung der hydraulischen Bremse 9/11 ein, sodaß die Vorschubgeschwindigkeit der Sonotrode 4 herabgesetzt wird. Durch Verschieben des Stellringes 14 läßt sich der Zeitpunkt genau einstellen, in dem die Bremse 9/11 wirksam wird. Durch Einstellung des Nadelventils am Brexsxylinder 9 kann die Bremswirkung mehr oder weniger stark eingestellt werden. Nan kann es also so einrichten, daß die Sonotrode 4 kurztvor oder beim Aufsetzen auf das Werkstück durch die Bremse 9/11 abgebremst wird, sodaß die Ultraschalleinwirkung bei stark vermindertem Anpressdruck erfolgt,während sich der Anpressdruck nach Maßgabe der an der Bremse 9/11 eingestellten Charakteristik langsam vergrößert0 In anderen Fällen kann es erforderlich sein, die Sonotrode 4 erst kurz nach dem Aufsetzen auf das Werkstueck abzubremsen, um die Vergrößerung des Anpressdruckes in bestimmter weise zu verzögernA pneumatically operated feed cylinder is attached to a machine beam 1 2 attached, the piston 3 of an ultrasonic transducer, not shown, and a associated sonotrode 4 carries. With the piston 3 is a vertically guided Connecting member 5 connected, which carries a fork-shaped driver 6, the one Carrying pin 6 'has. Located between the fork legs of the driver 6 There is a yoke 7 with an elongated hole 7 'in which the slave pin 6' slides Yoke 7 is pivotably mounted on a bearing bracket 8 which is fixed to the machine beam 1 is screwed on. A hydraulic brake cylinder 9 is attached to the feed cylinder 2, in which a brake piston 11 provided with a piston rod slides and in a known not shown, liquid from a cylinder chamber via a bypass displaced into the other cylinder chamber. The braking effect achieved is in As is known, this makes setting a throttling needle valve in handling fine adjustable. The piston rod 10 is through an at the free. End of the yoke 7 seated Eye 12 passed through. Two adjusting rings attached to the piston rod 10 so as to be adjustable 13, 14 serve as driving stops. If by switching on a pneumatic Auxiliary force of the feed lever 3 in the feed cylinder 2 is pressed down and thus the sonotrode 4 is approached to the workpiece, not shown, initially slides the driver pin 6 'in the elongated hole 7' of the yoke 7. Before the sonotrode 4 uuf the the workpiece is seated, the driver pin 6 'is at the lower end of the elongated hole 71 arrived, so that now the yoke 7 is taken. Once the eye 12 of the yoke 7 comes to rest on the adjusting ring 14, the action of the hydraulic brake continues 9/11, so that the feed speed of the sonotrode 4 is reduced. By Moving the adjusting ring 14, the time can be set exactly in which the 9/11 brake becomes effective. By adjusting the needle valve on the Brexsxylinder 9 the braking effect can be adjusted to a greater or lesser extent. Nan can do it so set up so that the sonotrode 4 shortly before or when it is placed on the workpiece is braked by the brake 9/11, so that the ultrasonic effect at greatly reduced contact pressure takes place, while the contact pressure according to measure the characteristic set on the brake 9/11 slowly increased0 In others In some cases it may be necessary to put the sonotrode 4 on shortly after it has been put on to brake the workpiece in order to increase the contact pressure in certain wise to delay

Claims (4)

Patentansprüche 10 Vorrichtung zur Ultraschallschweißung von Kunstetoffteilen mittels eines mit einer Sonotrode verbundenen Ultraschallgebers und einer durch Hilfskraft betriebenen Vorschubvorrichtung durch die das Werkstück und die Sonotrode zusaminengeführt und unter Pressdruck gesetzt werden, dadurch gekennzeichnet, daß die Vorschubvorrichtung (2, 3) mit einer hydraulischen, aus Kolben (11) und Zylinder (9) bestehenden Bremse verbunden ist, durch die die Vorschubgeschwindigkeit und/oder der Pressdruck nach einem vorbestiumbaren Vorschubweg in einstellbarer weise herabsetzbar ist. Claims 10 device for ultrasonic welding of plastic parts by means of an ultrasonic transducer connected to a sonotrode and a through Power-operated feed device through which the workpiece and the sonotrode are brought together and placed under pressure, characterized in that the feed device (2, 3) with a hydraulic one consisting of a piston (11) and a cylinder (9) existing brake is connected through which the feed rate and / or the pressing pressure can be reduced in an adjustable manner according to a pre-determined feed path is. 2. Vorrichtung nach Anspruoh 1 mit einem pneumatischen Vorschubzylinder und -kolben (3) für das aus Ultraschallgeber und So. notrode (4) bestehende Aggregat, dadurch gekennzeichnet, dass mit dem Vorschubzylinder (2)ein mit einem einstellbaren Umgang verse@ener hydraulischer Bremazylinder (9) verbunden ist und daß ein vom Kolben (3)des Vorschubzylinders (2) bewegtes über dem Vorschubzylinder (2) liegendes Joch (7) an der Kolbenstange (10) des Bremskolbens (11) zwischen einstellbaren Xitnahmegliedern (13, 14 (Stellringen) angreift.2. Device according to Anspruoh 1 with a pneumatic feed cylinder and piston (3) for the unit consisting of ultrasonic transducer and So. notrode (4), characterized in that an adjustable with the feed cylinder (2) Dealing verse @ ener hydraulic brake cylinder (9) is connected and that one of the Piston (3) of the feed cylinder (2) moved above the feed cylinder (2) Yoke (7) on the piston rod (10) of the brake piston (11) between adjustable drive members (13, 14 (collars) attacks. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Joch (7) einseitig schwenkbar gelagert und mit dem Vorschubkolben (3) durch eine einen Leerhub des Vorschubkolbens (3) zulassende Mitnahmevorrichtung (6', 7') gekuppelt ißt. 3. Apparatus according to claim 2, characterized in that the yoke (7) mounted pivotably on one side and with the feed piston (3) through a Idle stroke of the feed piston (3) permitting entrainment device (6 ', 7') coupled eats. 4. Verfahren zum Ultraschallschwei#en von Kunststoffteilen mittels einer Vorrichtung nach einem der Ansprtlche 1 bis 3, dadurch gekennzeichnet, daß der Vorschub der Sonotrode (4) unmittelbar vor oder beim Aufsetzen der Sonotrode (4) auf das Werkstück derart abgebremst wird, da# eine Ultraschalleinwirkung auf das Werkstück bei stark verminderter Pressdruck erfolgt, und daß sich der Preßdruck nach einer durch die Bremse (9, 11) einstellbaren Charakteristik vergrößert.4. Process for ultrasonic welding of plastic parts by means of a device according to one of Claims 1 to 3, characterized in that that the advance of the sonotrode (4) immediately before or when placing the sonotrode (4) is braked on the workpiece in such a way that # an ultrasonic effect the workpiece takes place at greatly reduced pressing pressure, and that the pressing pressure enlarged according to a characteristic adjustable by the brake (9, 11).
DE19671704219 1967-03-16 1967-03-16 Device and method for ultrasonic welding of plastic parts Pending DE1704219A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEN0030167 1967-03-16

Publications (1)

Publication Number Publication Date
DE1704219A1 true DE1704219A1 (en) 1971-04-22

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DE19671704219 Pending DE1704219A1 (en) 1967-03-16 1967-03-16 Device and method for ultrasonic welding of plastic parts

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507585A2 (en) * 1991-04-03 1992-10-07 BICC Public Limited Company Optical fibre splicing
EP1561567A2 (en) * 2004-02-09 2005-08-10 Wilhelm Hollinger Maschinenbau GmbH & Co. KG Apparatus and process for manufacturing a frame part by welding plastic profiles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507585A2 (en) * 1991-04-03 1992-10-07 BICC Public Limited Company Optical fibre splicing
EP1561567A2 (en) * 2004-02-09 2005-08-10 Wilhelm Hollinger Maschinenbau GmbH & Co. KG Apparatus and process for manufacturing a frame part by welding plastic profiles
EP1561567A3 (en) * 2004-02-09 2012-03-07 Wilhelm Hollinger Maschinenbau GmbH & Co. KG Apparatus and process for manufacturing a frame part by welding plastic profiles

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