DE4317699A1 - Method for producing film capacitors - Google Patents

Abstract

In a method for producing film capacitors, first of all a plurality of mother capacitors (3) are wound onto a drum (1), separating (isolating) layers (4) made of plastic films also being wound in between the mother capacitors (3). The ends of the separating layers (4) project over the output winding (2) formed in this way. Prior to separating the individual mother capacitors (3) along the separating layers (4), the projecting regions of the separating layers (4) are brushed off by a pot-type brush (6) having wire bristles (8). The peripheral region (5) of the drum (1) is matched to the width of the output winding (2), with the result that the bristles (8) of the pot-type brush (6) run virtually perpendicularly with respect to the projecting parts of the separating layers (4). <IMAGE>

Description

The invention relates to a method for producing Film capacitors, in which several bravery on one drum terwickel be wrapped on top of each other, in which between the mother wraps are wrapped in plastic layers be which over the end faces of the mother wrap in front stand in which the two end faces of the thus formed Output winding each full with a spray metal layer are constantly covered, where the over the spray metal do not fully overlap protruding areas of the separating layers are constantly covered with spray metal and this overlaps areas before dividing the thus formed Aus output capacitor are removed, in which the output con capacitor separated by at least one radial cut and along the separation layers into individual mother capacitors is divided, in which the mother capacitors in single con capacitors are sawn using the separating layers made of art Fabric films are produced, which after the finish development of the output capacitor at least in the Spray metal layers protruding areas are brittle, in which these protruding areas of the separating layers by means of can be brushed off with a rotating pot brush and with the the separating layers after dividing them into individual mother condensers sensors are removed.

Such a method is known from DE 30 17 507 C2 knows.  

In the known method, many layers (depending for example, of the desired capacity of the individual account capacitors 50 to 2000) metallized plastic film ring shaped on a drum of z. B. 500 mm diameter wraps. After reaching the desired number of layers, a both over the end faces of the wound mother wrap mutually protruding separation layer applied at least in one layer wraps and then the next metallized mother wrap Plastic films made, a new separating layer opened winds until the desired initial winding is obtained.

After winding up all the mother windings, the output windings become together on the drum with one or more me tall spray layers, preferably by means of Schoop's Flame spraying process, provided on both faces. Of the Output capacitor can then pass through on the drum a heat treatment (annealing), e.g. B. by storage at about 140 ° C, are solidified.

Then the output capacitor is by at least a radial section separated, removed from the drum and along the separation layers into individual mother condensates the other, cut into small pieces by sawing, the later ones Individual capacitors, can be dismantled.

At the beginning and at the end of a mother capacitor wrapped (and later discarded) separating layers have the Task, the separation of the mother capacitors after the fro provide the spray metal layers and the annealing lichen by training the metal spraying formation of a continuous spray metal layer and others  on the other hand, the annealing of the mother condensate during tempering prevent ren.

When producing the spray metal layers, however, in the fillet between the face of the exit wrap and the separating layers are increasingly metal, which is a undesirable mechanical connection between output capacitor and separator layers, which the later Disconnect the mother capacitors and remove the separation layers difficult.

In the publication mentioned above is therefore featured beat before disconnecting the output capacitors Use a rotating pot brush both in the hollow throat protruding material as well as the protruding Remove separating layer parts.

The prerequisite for this is the use of separating layers that can easily be broken at least after tempering e.g. B. because they become brittle when tempered.

However, since the drum is wider than the one placed on it brought output capacitor is, the brush can only up to the circumference of the drum are brought up so that the boron the separating layers of the innermost mother capacitors only grazing, d. H. touch lengthways.

This will cancel the overhang at this point Separating layer parts and the excessive spray sticking to them tall parts difficult. Therefore also to the inner mother capacitors a complete removal of the excess Reaching metal and separating layer parts must take longer and with  higher brushing force than that for the mother capacitors located further outside are required would. The undesirable consequence of this measure is that the outer mother capacitors also outside the fillets the outer spray metal layer is partially removed, so that the soldering or welding of the leads affects is pregnant (e.g. in the form of a reduced mechanical strength). Furthermore, the bristles on the outer edge the pot brush is stronger due to its longer procedure worn as the arranged on the inner edge, so that the described effect intensified.

The object of the present invention is therefore that to further develop the process described above in such a way that the identified difficulties can be avoided.

This object is achieved in that a Drum is used, the width of which min dert and corresponds to the width of the initial winding.

Preferably, a drum is used in which the height of the area with reduced width is selected in such a way that the imaginary extension of the axis of rotation of the pot brush approximately meets the front center of the exit wrap.

The invention is based on the following embodiment explained in more detail.

In the accompanying drawing show sections

Fig. 1 shows a drum with output capacitor in the viewing direction transverse to the axis of rotation of the drum

Fig. 2 shows the drum of FIG. 1 in the direction of the axis of rotation.

In Fig. 1 a section of a drum 1 is Darge, on which an output capacitor 2 is wound. The output capacitor 2 consists of a plurality of mother capacitors 3 arranged one above the other, which are separated from one another by separating foils 4 .

In the vicinity of the circumference, the drum has an area 5 , the width of which corresponds to the width of the output capacitor 2 . With the help of a pot brush 6 rotatable about the axis 7 with the wire bristles 8 , the protruding areas of the separating layers 4 are brushed off.

The height of the area 5 with reduced width is chosen so that the imaginary extension of the axis of rotation 7 approximately meets the front center of the output capacitor 2 . As can be seen from FIG. 2, the grip area 9 of the bristles 8 is thereby almost all of the capacitors 3 are perpendicular to the protruding Trennla gene 4 and the protruding spray material deposits. By rotating the drum 1 in the direction of arrow 10, the bristles 8 meet first in one direction 11 and then in the other direction 12 on the separating layers 4 , which thus easily break open.

In addition, all bristles 8 now have approximately the same length of engagement paths at the output capacitor 2 , so that approximately uniform wear of the bristles 8 is ensured.

The described process steps achieve uniform removal of the protruding parts (separating film 4 and spray metal layer) with reduced brush pressures and times, which improves both the quality of the individual capacitors produced (by lower forces on the pressure-sensitive dislocation zones below the spray metal layers) and that Service life of the brushes 6 is increased.

Claims (2)

1. A method for producing film capacitors, in which a plurality of mother windings ( 3 ) are wound one on top of the other in a drum ( 1 ), in which separating layers ( 4 ) are wrapped between the mother windings ( 3 ), which areas over the end faces of the mother windings ( 3 ) protrude, in which the two end faces of the output winding ( 2 ) thus formed are each completely covered with a spray metal layer, in which the areas of the separating layers ( 4 ) projecting beyond the spray metal layers are not completely covered with spray metal and these projecting areas before dividing of the output capacitor thus formed, (2) ent be removed, wherein the output capacitor (2) is separated a radial section through at least and divided along the parting layers (4) into individual mother capacitors (3), wherein the mother capacitors (3) factors in Einzelkondensa are sawn, in which the separating layers ( 4 ) are made of plastic films are ellt which are after comple development of the output capacitor (2) at least in the foregoing on the sprayed metal layer regions brittle, in which said projecting portions of the separating layers are brushed (4) by means of a rotating pot brush (6) and in which the separating layers (4 ) after being divided into individual mother capacitors ( 3 ), characterized in that a drum ( 1 ) is used, the width of which is reduced in the vicinity of the circumference ( 5 ) and corresponds to the width of the output winding ( 2 ). 2. The method according to claim 1, characterized in that a drum ( 1 ) is used in which the height of the area ( 5 ) with a reduced width is selected such that the imaginary extension of the axis of rotation ( 7 ) of the pot brush ste ( 6 ) approximately meets the front center of the exit winding ( 2 ).