EP0058757B1 - Method of sealing an electrical unit, in particular a relay - Google Patents

Method of sealing an electrical unit, in particular a relay Download PDF

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Publication number
EP0058757B1
EP0058757B1 EP81109139A EP81109139A EP0058757B1 EP 0058757 B1 EP0058757 B1 EP 0058757B1 EP 81109139 A EP81109139 A EP 81109139A EP 81109139 A EP81109139 A EP 81109139A EP 0058757 B1 EP0058757 B1 EP 0058757B1
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EP
European Patent Office
Prior art keywords
fleece
housing
process according
stamp
component
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.)
Expired
Application number
EP81109139A
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German (de)
French (fr)
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EP0058757A1 (en
Inventor
Cornelia Dipl.-Phys. Albert
Ulf Dipl.-Phys. Rauterberg
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Siemens AG
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Siemens AG
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Application filed by Siemens AG filed Critical Siemens AG
Priority to AT81109139T priority Critical patent/ATE9190T1/en
Publication of EP0058757A1 publication Critical patent/EP0058757A1/en
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Publication of EP0058757B1 publication Critical patent/EP0058757B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/023—Details concerning sealing, e.g. sealing casing with resin
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

  • the invention relates to a method for sealing an electrical component, in particular a relay, with a housing having single openings or joints, wherein initially a fleece, ie. H. a layer of fabric with high capillary absorbency, placed over the housing openings to be sealed, pressed onto the component and then impregnated with a thin, hardenable casting resin.
  • a fleece ie. H. a layer of fabric with high capillary absorbency
  • Such a method is known from DE-B-2 616 299. It is mainly used to seal the housing openings for connecting pins and the housing joints between a base and a protective cap.
  • the fleece With the use of the fleece, it is possible to distribute a small amount of casting resin well over the entire surface and, in particular, to introduce it to the housing openings without contaminating the protruding connecting pins and without significantly increasing the overall height of a relay or a similar component.
  • pressure stamps in order to adapt the cover layer comprising the fleece to level differences of the component surface. In the method described there, however, it is provided that the stamp presses on the already impregnated fleece, which in turn requires special measures to prevent the casting resin from sticking to the stamp.
  • the object of the present invention is to further develop the method of the type mentioned at the outset such that the nonwoven applied is in good contact at all points on the component surface and thereby ensures an even distribution of resin and sealing, without special measures for stamp maintenance or additional parts such as magazines and Pressure frames are temporarily connected to the component and require additional work steps.
  • this object is achieved in that the pressing of the fleece takes place immediately before the application of the casting resin with a heated stamp adapted to the component surface.
  • the fleece according to the invention By pressing the fleece according to the invention with a stamp mentioned, it is ensured that the fleece is smoothed before the resin is applied. This resin results in a good and tight connection to the component surface at all points; the fleece retains a smooth surface even after curing.
  • the stamp for pressing the fleece is an additional device in production. However, it means much less effort than the method of first putting the relays in a magazine, fitting them with cover frames and these cover frames, which are used for the production output of the whole Hardening time must be available, later to be released from the relays and ready for a new use.
  • the printout stamp used according to the invention can easily be integrated into an automated production line.
  • the temperature of the stamp is selected as a function of the material of the fleece in such a way that the fleece is only smoothed out by briefly pressing it on.
  • conventional nonwovens such as rayon or polyester fibers
  • temperatures of around 200 ° C. are selected.
  • this method can also use nonwovens, such as polyester, which could not be used because of their tendency to form waves.
  • thermoplastic housing material so that the housing surface is melted and glued to the fleece.
  • temperatures of around 240 ° C are selected.
  • the fleece covers larger free areas, it can also be expedient to provide the fleece with slots from the edge in order to prevent the fleece from being lifted off in any case.
  • the nonwoven is soaked with a small amount of a solvent attacking the housing material before the stamp is pressed on.
  • the surface of the housing is slightly loosened and glued to the fleece when the stamp is pressed on. It may be sufficient to apply the solvent only in a few places, preferably in the edge region of the housing.
  • the capillary action of the fleece is used for the distribution of the solvent before the casting resin is introduced.
  • the solvent can, for example, through openings in the stamp the fleece can be applied.
  • the advantage of this method lies primarily in the fact that a considerably lower temperature can be chosen for the stamp than in the methods mentioned above; for example, a stamp temperature of approx. 40 ° C. is sufficient. This is important in the case of very thin-walled housings which could warp at high stamp temperatures.
  • the solvent can be applied directly to the fleece through openings in the stamp, for example. This largely avoids the occurrence of harmful solvent vapors.
  • the usual solvents are used, such as trichlorethylene, perchlorethylene, acetone or methylene chloride.
  • the flow of the casting resin from a filling point to distant housing edges can be improved by additional grooves in the housing surface. This can be of advantage in the case of large housing surfaces to be sealed, in which the casting resin then reaches the removed edges from a filling point via individual channels below the fleece and is distributed over the entire surface from the ducts through the fleece.
  • a component 1, for. B. a relay, with a housing cap 2 (partially cut) and a base 3 through which pins 4 are guided to the outside.
  • the housing thus has joints 5 between the housing cap 2 and the base 3 and openings 6 in the base for the connections 4, which are to be sealed together with a fleece 7 and with casting resin.
  • the component 1 is conveyed on a transport frame 8 under a heated stamp 9, which is briefly pressed vertically onto the fleece.
  • This stamp 9 is precisely adapted to the component surface. It thus has, for example, recesses 10 for the connecting pins 4. Any gradations of the component surface which are not shown here are also taken into account by adapting the stamp surface accordingly, so that the fleece 7 is pressed evenly onto the component surface and smoothed by the heated stamp.
  • the temperature of the stamp can be chosen so that the component surface is melted slightly and glued to the fleece. It could be sufficient that, for example, only the edge of the cap 2 is glued all round to the fleece 7.
  • the component 1 has a cap 2 and a base 3, the housing openings of which are covered with a fleece 7.
  • a heated stamp 11 is used to press the fleece, which additionally has a channel system 12 with openings 13 to the pressure side.
  • a supply hose 14 can be used to apply a small amount of solvent to the fleece 7 in order to easily dissolve the surface of the component and to glue it to the fleece 7. The solvent can be introduced shortly before or while the stamp is pressed firmly onto the fleece.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Cable Accessories (AREA)
  • Contacts (AREA)
  • Casings For Electric Apparatus (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Motor Or Generator Frames (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Insulating Bodies (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

A fleece is employed for the distribution of casting resin over a component surface to be sealed. Prior to the introduction of the casting resin, pressure is applied on the fleece with a heated stamp in order to smoothen the fleece. Through increased temperature of the stamp, or through a solvent, the fleece can be readily cemented together with the component surface. It is thus ensured that the fleece rests uniformly on the entire component surface to promote a favorable distribution of the casting resin.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Abdichtung eines elektrischen Bauelementes, insbesondere eines Relais, mit einem einzelne Durchbrüche bzw. Fugen aufweisenden Gehäuse, wobei zunächst ein Vlies, d. h. eine Gewebeschicht mit hoher kapillarer Saugfähigkeit, über die abzudichtenden Gehäusedurchbrüche gelegt, auf das Bauelement gedrückt und anschließend mit einem dünnflüssigen aushärtbaren Gießharz getränkt wird.The invention relates to a method for sealing an electrical component, in particular a relay, with a housing having single openings or joints, wherein initially a fleece, ie. H. a layer of fabric with high capillary absorbency, placed over the housing openings to be sealed, pressed onto the component and then impregnated with a thin, hardenable casting resin.

Ein derartiges Verfahren ist aus der DE-B-2 616 299 bekannt. Es wird im wesentlichen angewendet zur Abdichtung der Gehäusedurchbrüche für Anschlußstifte und der Gehäusefugen zwischen einem Sockel und einer Schutzkappe. Mit der Verwendung des Vlieses ist es dabei möglich, eine geringe Menge an Gießharz gut über die gesamte Oberfläche zu verteilen und insbesondere an die Gehäusedurchbrüche heranzuführen, ohne dabei die herausragenden Anschlußstifte zu verunreinigen und ohne die Bauhöhe eines Relais oder eines ähnlichen Bauelementes wesentlich zu vergrößern. Dort ist auch die Möglichkeit der Verwendung von Andrückstempeln erwähnt, um die das Vlies umfassende Deckschicht an Niveauunterschiede der Bauteiloberfläche anzupassen. Bei dem dort beschriebenen Verfahren ist allerdings vorgesehen, daß der Stempel jeweils auf das schon getränkte Vlies drückt, wodurch wiederum besondere Maßnahmen erforderlich werden, um das Ankleben des Gießharzes an dem Stempel zu vermeiden.Such a method is known from DE-B-2 616 299. It is mainly used to seal the housing openings for connecting pins and the housing joints between a base and a protective cap. With the use of the fleece, it is possible to distribute a small amount of casting resin well over the entire surface and, in particular, to introduce it to the housing openings without contaminating the protruding connecting pins and without significantly increasing the overall height of a relay or a similar component. There is also mentioned the possibility of using pressure stamps in order to adapt the cover layer comprising the fleece to level differences of the component surface. In the method described there, however, it is provided that the stamp presses on the already impregnated fleece, which in turn requires special measures to prevent the casting resin from sticking to the stamp.

Für den Abdichtvorgang ist entscheidend, daß das Vlies auf der abzudichtenden Gehäuseoberfläche, insbesondere auch an den Rändern, plan aufliegt, da sonst Undichtigkeiten auftreten können. Um dies zu erreichen, wurde auch bereits vorgeschlagen, während des Einbringens des Gießharzes einen Rahmen auf das Vlies aufzulegen und somit das Vlies an den Rändern bis zum Aushärten des Gießharzes zu beschweren. Dies bedeutet allerdings einen erhöhten Fertigungsaufwand, da diese Rahmen aus besonderem Material, beispielsweise Polytetrafluoräthylen, bestehen müssen, um ein Ankleben des Gießharzes an den Rahmen zu vermeiden. Wegen der verhältnismäßig langen Dauer des Aushärtevorgangs (einige Stunden) muß eine große Zahl dieser kostspieligen Rahmen zur Verfügung stehen, außerdem müssen diese nach jeder Verwendung gereinigt werden, um weiterverwendet werden zu können.It is crucial for the sealing process that the fleece lies flat on the housing surface to be sealed, especially at the edges, otherwise leaks can occur. In order to achieve this, it has also already been proposed to place a frame on the fleece during the introduction of the casting resin and thus to weigh down the fleece at the edges until the casting resin has hardened. However, this means an increased manufacturing effort, since these frames have to be made of a special material, for example polytetrafluoroethylene, in order to avoid the casting resin sticking to the frame. Because of the relatively long duration of the curing process (a few hours), a large number of these expensive frames must be available, and these must also be cleaned after each use in order to be able to be used again.

Aufgabe der vorliegenden Erfindung ist es, das Verfahren der eingangs erwähnten Art so weiterzuentwickeln, daß das aufgebrachte Vlies an allen Stellen der Bauteiloberfläche gut anliegt und dadurch eine gleichmäßige Harzverteilung und Abdichtung sicherstellt, ohne daß besondere Maßnahmen zur Stempelreinhaltung erforderlich sind oder zusätzliche Teile wie Magazine und Andruckrahmen zeitweise mit dem Bauelement verbunden werden und zusätzliche Arbeitsgänge erfordern. Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das Aufdrücken des Vlieses unmittelbar vor dem Aufbringen des Gießharzes mit einem der Bauelementoberfläche angepaßten, erwärmten Stempel erfolgt.The object of the present invention is to further develop the method of the type mentioned at the outset such that the nonwoven applied is in good contact at all points on the component surface and thereby ensures an even distribution of resin and sealing, without special measures for stamp maintenance or additional parts such as magazines and Pressure frames are temporarily connected to the component and require additional work steps. According to the invention this object is achieved in that the pressing of the fleece takes place immediately before the application of the casting resin with a heated stamp adapted to the component surface.

Durch das erfindungsgemäße Andrücken des Vlieses mit einem erwähnten Stempel wird sichergestellt, daß das Vlies bereits vor dem Aufbringen des Harzes geglättet wird. Dieses Harz ergibt an allen Stellen eine gute und dichte Verbindung mit der Bauteiloberfläche; auch nach dem Aushärten behält das Vlies eine glatte Oberfläche. Der Stempel zum Andrücken des Vlieses stellt zwar eine zusätzliche Vorrichtung in der Fertigung dar. Er bedeutet jedoch wesentlich weniger Aufwand als die Methode, die Relais zunächst in ein Magazin zu bringen, mit Abdeckrahmen zu bestücken und diese Abdeckrahmen, die ja für den Fertigungsausstoß der gesamten Aushärtezeit zur Verfügung stehen müssen, später wieder von den Relais zu lösen und für einen neuen Einsatz bereitzuhalten. Der erfindungsgemäß verwendete Ausdruckstempel kann dagegen ohne weiteres in eine automatisierte Fertigungsstraße integriert werden.By pressing the fleece according to the invention with a stamp mentioned, it is ensured that the fleece is smoothed before the resin is applied. This resin results in a good and tight connection to the component surface at all points; the fleece retains a smooth surface even after curing. The stamp for pressing the fleece is an additional device in production. However, it means much less effort than the method of first putting the relays in a magazine, fitting them with cover frames and these cover frames, which are used for the production output of the whole Hardening time must be available, later to be released from the relays and ready for a new use. The printout stamp used according to the invention, on the other hand, can easily be integrated into an automated production line.

In einer Ausführungsform des erfindungsgemäßen Verfahrens wird die Temperatur des Stempels in Abhängigkeit vom Material des Vlieses so gewählt, daß das Vlies durch ein kurzes Andrücken lediglich geglättet wird. Bei üblichen Vliesstoffen, wie Zellwolle oder Polyesterfasern, werden Temperaturen von etwa 200° C gewählt. Bei diesem Verfahren können im Gegensatz zu bisher üblichen Verfahren auch Vliesstoffe verwendet werden, die wegen ihrer Neigung zur Wellenbildung bisher nicht einsetzbar waren, wie beispielsweise Polyester.In one embodiment of the method according to the invention, the temperature of the stamp is selected as a function of the material of the fleece in such a way that the fleece is only smoothed out by briefly pressing it on. With conventional nonwovens, such as rayon or polyester fibers, temperatures of around 200 ° C. are selected. In contrast to conventional methods, this method can also use nonwovens, such as polyester, which could not be used because of their tendency to form waves.

Weiterhin kann es zweckmäßig sein, die Temperatur des Stempels in Anpassung an ein thermoplastisches Gehäusematerial so zu wählen, daß die Gehäuseoberfläche angeschmolzen und mit dem Vlies verklebt wird. Bei üblichen Thermoplasten werden hierbei Temperaturen von etwa 240° C gewählt. Soweit das Vlies größere freie Flächen überdeckt, kann es auch zweckmäßig sein, das Vlies vom Rand her mit Schlitzen zu versehen, um ein späteres Abheben des Vlieses in jedem Fall zu verhindern.Furthermore, it may be expedient to choose the temperature of the stamp in adaptation to a thermoplastic housing material so that the housing surface is melted and glued to the fleece. For conventional thermoplastics, temperatures of around 240 ° C are selected. If the fleece covers larger free areas, it can also be expedient to provide the fleece with slots from the edge in order to prevent the fleece from being lifted off in any case.

In einer weiteren Ausführungsform des erfindungsgemäßen Verfahrens ist vorgesehen, daß das Vlies vor dem Andrücken des Stempels mit einer geringen Menge eines das Gehäusematerial angreifenden Lösungsmittels getränkt wird. In diesem Fall wird die Gehäuseoberfläche etwas angelöst und verklebt beim Aufdrücken des Stempels mit dem Vlies. Dabei kann es genügen, das Lösungsmittel nur an wenigen Stellen, vorzugsweise im Randbereich des Gehäuses, aufzubringen. Die Kapillarwirkung des Vlieses wird in diesem Fall bereits vor dem Einbringen des Gießharzes für die Verteilung des Lösungsmittels ausgenutzt. Das Lösungsmittel kann beispielsweise durch Öffnungen des Stempels auf das Vlies aufgebracht werden. Der Vorteil dieses Verfahrens liegt vor allem darin, daß für den Stempel eine erheblich niedrigere Temperatur als bei den obengenannten Methoden gewählt werden kann; es genügt beispielsweise eine Stempeltemperatur von ca. 40° C. Dies ist wichtig bei sehr dünnwandigen Gehäusen, die sich bei hohen Stempeltemperaturen verziehen könnten.In a further embodiment of the method according to the invention it is provided that the nonwoven is soaked with a small amount of a solvent attacking the housing material before the stamp is pressed on. In this case, the surface of the housing is slightly loosened and glued to the fleece when the stamp is pressed on. It may be sufficient to apply the solvent only in a few places, preferably in the edge region of the housing. In this case, the capillary action of the fleece is used for the distribution of the solvent before the casting resin is introduced. The solvent can, for example, through openings in the stamp the fleece can be applied. The advantage of this method lies primarily in the fact that a considerably lower temperature can be chosen for the stamp than in the methods mentioned above; for example, a stamp temperature of approx. 40 ° C. is sufficient. This is important in the case of very thin-walled housings which could warp at high stamp temperatures.

Das Lösungsmittel kann beispielsweise durch Öffnungen im Stempel unmittelbar auf das Vlies aufgebracht werden. Damit vermeidet man weitgehend das Auftreten schädlicher Lösungsmitteldämpfe. Verwendet werden im übrigen übliche Lösungsmittel, wie beispielsweise Trichloräthylen, Perchloräthylen, Aceton oder Methylenchlorid.The solvent can be applied directly to the fleece through openings in the stamp, for example. This largely avoids the occurrence of harmful solvent vapors. The usual solvents are used, such as trichlorethylene, perchlorethylene, acetone or methylene chloride.

Soweit durch ein großflächiges Ankleben des Vlieses dessen Kapillarwirkung beeinträchtigt werden könnte, kann man den Fluß des Gießharzes von einer Einfüllstelle zu entfernten Gehäusekanten durch zusätzliche Rillen in der Gehäuseoberfläche verbessern. Das kann von Vorteil sein bei großen abzudichtenden Gehäuseoberflächen, bei denen dann von einer Einfüllstelle aus das Gießharz zunächst über einzelne Kanäle unterhalb des Vlieses bis zu den entfernten Rändern gelangt und von den Kanälen aus durch das Vlies über die gesamte Fläche verteilt wird.To the extent that the capillary effect could be impaired by a large-area gluing of the fleece, the flow of the casting resin from a filling point to distant housing edges can be improved by additional grooves in the housing surface. This can be of advantage in the case of large housing surfaces to be sealed, in which the casting resin then reaches the removed edges from a filling point via individual channels below the fleece and is distributed over the entire surface from the ducts through the fleece.

Beispiele für das erfindungsgemäße Verfahren werden nachfolgend anhand der Zeichnung näher erläutert. Es zeigt

  • Fig. 1 eine Vorrichtung zum Andrücken des Vlieses mit einem beheizten Stempel,
  • Fig. eine Vorrichtung mit zusätzlicher Lösungsmittelzuführung.
Examples of the method according to the invention are explained in more detail below with reference to the drawing. It shows
  • 1 is a device for pressing the fleece with a heated stamp,
  • Fig. A device with additional solvent supply.

Anhand von Fig. 1 sei allgemein das Andrükken des Vlieses beschrieben. Dargestellt ist ein Bauelement 1, z. B. ein Relais, mit einer Gehäusekappe 2 (teilweise geschnitten) und einem Sockel 3, durch den Anschlußstifte 4 nach außen geführt sind. Das Gehäuse weist somit Fugen 5 zwischen der Gehäusekappe 2 und dem Sockel 3 sowie Durchbrüche 6 im Sockel für die Anschlüsse 4 auf, die gemeinsam mit einem Vlies 7 und mit Gießharz abgedichtet werden sollen.The pressing of the fleece is generally described with reference to FIG. 1. A component 1, for. B. a relay, with a housing cap 2 (partially cut) and a base 3 through which pins 4 are guided to the outside. The housing thus has joints 5 between the housing cap 2 and the base 3 and openings 6 in the base for the connections 4, which are to be sealed together with a fleece 7 and with casting resin.

Um ein Abheben des Vlieses insbesondere an den Rändern vor dem Aushärten des Gießharzes, das in das Vlies eingebracht wird, zu vermeiden, wird das Bauelement 1 auf einem Transportrahmen 8 unter einen beheizten Stempel 9 befördert, der kurzzeitig senkrecht auf das Vlies gedrückt wird. Dieser Stempel 9 ist genau der Bauteiloberfläche angepaßt. Er besitzt also beispielsweise Ausnehmungen 10 für die Anschlußstifte 4. Auch gegebenenfalls vorhandene Abstufungen der Bauteiloberfläche, die hier nicht dargestellt sind, werden durch entsprechende Anpassung der Stempeloberfläche berücksichtigt, so daß das Vlies 7 durch den beheizten Stempel gleichmäßig auf die Bauteiloberfläche aufgedrückt und geglättet wird.In order to prevent the fleece from lifting off, in particular at the edges, before the casting resin which is introduced into the fleece has hardened, the component 1 is conveyed on a transport frame 8 under a heated stamp 9, which is briefly pressed vertically onto the fleece. This stamp 9 is precisely adapted to the component surface. It thus has, for example, recesses 10 for the connecting pins 4. Any gradations of the component surface which are not shown here are also taken into account by adapting the stamp surface accordingly, so that the fleece 7 is pressed evenly onto the component surface and smoothed by the heated stamp.

Wie bereits beschrieben, kann die Temperatur des Stempels so gewählt werden, daß die Bauteiloberfläche leicht angeschmolzen und mit dem Vlies verklebt wird. Dabei könnte es ausreichen, daß beispielsweise lediglich der Rand der Kappe 2 ringsum mit dem Vlies 7 verklebt wird.As already described, the temperature of the stamp can be chosen so that the component surface is melted slightly and glued to the fleece. It could be sufficient that, for example, only the edge of the cap 2 is glued all round to the fleece 7.

Die Fig. 2 zeigt eine etwas abgewandelte Ausführungsform. Das Bauelement 1 besitzt wie in Fig. 1 eine Kappe 2 und einen Sockel 3, deren Gehäuseöffnungen mit einem Vlies 7 abgedeckt werden. Zum Andrücken des Vlieses wird ein beheizter Stempel 11 verwendet, der zusätzlich ein Kanalsystem 12 mit Öffnungen 13 zur Andruckseite hin aufweist. Über einen Zuführungsschlauch 14 kann hierbei Lösungsmittel in geringer Dosierung auf das Vlies 7 gebracht werden, um die Oberfläche des Bauteiles leicht anzulösen und mit dem Vlies 7 zu verkleben. Das Lösungsmittel kann eingebracht werden, kurz bevor oder während der Stempel fest auf das Vlies aufgedrückt wird.2 shows a somewhat modified embodiment. As in FIG. 1, the component 1 has a cap 2 and a base 3, the housing openings of which are covered with a fleece 7. A heated stamp 11 is used to press the fleece, which additionally has a channel system 12 with openings 13 to the pressure side. A supply hose 14 can be used to apply a small amount of solvent to the fleece 7 in order to easily dissolve the surface of the component and to glue it to the fleece 7. The solvent can be introduced shortly before or while the stamp is pressed firmly onto the fleece.

Claims (7)

1. A process for sealing an electrical component (1) particularly a relay, having a housing provided with individual openings (6) and joints (5), in which firstly a fleece (7), i. e. a textile layer of high capillary absorptive capacity, is placed over the housing openings (5, 6) which are to be sealed, pressed onto the component (1), and subsequently saturated with a highly mobile, hardenable casting resin, characterised in that the fleece (7) is pressed on immediately prior to the application of the casting resin using a heated die (9, 11) adapted to the component surface.
2. A process according to claim 1, characterised in that the temperature of the die (9) is adapted to the fleece material and is so selected that the fleece (7) is smoothed.
3. A process according to claim 1, characterised in that the temperature of the die (9) is adapted to a thermoplastic material used for the housing (2, 3) and is so selected that the housing surface melts and adheres to the fleece (7).
4. A process according to one of claims 1 to 3, characterised in that, before-it is applied to the component (1), the fleece (7) is slit in the direction leading away from the edge region.
5. A process according to claim 1, characterised in that, before being subjected to the pressure of the die (19), the fleece (7) is saturated with a small amount of a solvent (14) which attacks the material of the housing.
6. A process according to claim 5, characterised in that the solvent is applied only at a few places, preferably in the edge region of the housing (2).
7. A process according to claim 5 or claim 6, characterised in that the solvent is applied to the fleece (7) through openings (13) in the die (11).
EP81109139A 1981-02-20 1981-10-28 Method of sealing an electrical unit, in particular a relay Expired EP0058757B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81109139T ATE9190T1 (en) 1981-02-20 1981-10-28 METHOD OF SEALING AN ELECTRICAL COMPONENT, ESPECIALLY A RELAY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3106371 1981-02-20
DE19813106371 DE3106371A1 (en) 1981-02-20 1981-02-20 METHOD FOR SEALING AN ELECTRICAL COMPONENT, IN PARTICULAR A RELAY

Publications (2)

Publication Number Publication Date
EP0058757A1 EP0058757A1 (en) 1982-09-01
EP0058757B1 true EP0058757B1 (en) 1984-08-29

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EP81109139A Expired EP0058757B1 (en) 1981-02-20 1981-10-28 Method of sealing an electrical unit, in particular a relay

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US (1) US4427612A (en)
EP (1) EP0058757B1 (en)
JP (1) JPS57152632A (en)
AT (1) ATE9190T1 (en)
BR (1) BR8200921A (en)
DE (2) DE3106371A1 (en)
PT (1) PT74465B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4975545A (en) * 1988-07-20 1990-12-04 Wickes Manufacturing Company Sealed relay assembly
DE9215176U1 (en) * 1992-11-07 1992-12-24 Meteor Gummiwerke K. H. Bädje GmbH & Co, 31167 Bockenem Safety profile piece with contact strips

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2216752B1 (en) * 1973-02-02 1979-01-12 Toko Inc
DE2616299C2 (en) * 1976-04-13 1978-04-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Wash-proof protective device for an electromechanical component and method for its sealing
DE2618492C2 (en) * 1976-04-27 1984-03-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Wash-proof protective device for an electromechanical component
DE2710211A1 (en) * 1977-03-09 1978-09-14 Licentia Gmbh Electronic control circuits cast in silicone rubber or epoxy! resin - have accessible components e.g. terminals protected by removable silicone rubber hoods prior to casting

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DE3165792D1 (en) 1984-10-04
PT74465A (en) 1982-03-01
EP0058757A1 (en) 1982-09-01
ATE9190T1 (en) 1984-09-15
US4427612A (en) 1984-01-24
PT74465B (en) 1983-08-19
JPS57152632A (en) 1982-09-21
DE3106371A1 (en) 1982-09-09
BR8200921A (en) 1982-12-28

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