DE3637725C1 - Method for producing electrical film capacitors - Google Patents

Abstract

A method for producing electrical film capacitors, in the case of which method an original capacitor is wound with a plurality of large diameter mother capacitor rings, which are wound one on top of the other. At least one lower covering film layer and a separating strip (which is located underneath it) are wound at the same time under each mother capacitor ring, and at least one upper covering film layer and one separating strip (which is located on top of it) are wound at the same time over each mother capacitor ring, the original capacitor is subjected to heat treatment, is coated with a sprayed-metal layer on both end surfaces and is split up into the mother capacitor rings which are sawn apart to produce individual capacitors which are bonded onto a transportation adhesive strip on the side of the covering film layer, which transportation adhesive strip is pulled off the individual capacitors after they have been transferred into a further processing station. In order in this case to avoid the adjacent covering film layer being pulled off the individual capacitors inadvertently together with the transportation adhesive strip, a tear-off strip, which is not bonded to these covering film layers is wound in between each separating strip and at least one of the two covering film layers adjacent to this separating strip while the original capacitor is being wound, the side edges of which tear-off strip are also metal sprayed during the metal spraying and which tear-off strip is pulled off the individual capacitors together with the transportation adhesive strip.

Description

The invention relates to a method for producing electrical Film capacitors in which an output capacitor with several superimposed mother capacitor rings large Diameter wound from at least one capacitor foil tape and at least one lower one under each capacitor ring Cover film layer and an underlying release tape, as well as each the mother capacitor ring at least one top cover layer and an overlying separating tape can be co-wound, the output condenser subjected to heat treatment on both faces chen coated with a Schoopierschicht and into the mother con capacitor rings or parts thereof is broken down into individual con capacitors are sawn, which cover film layer side on a Transport tape can be glued, which after transfer of the individual capacitors in a processing station from this is subtracted.

Winding an output capacitor to produce Layer capacitors in a method of the above type is off DE-PS 24 24 386 known. The cover film layers that are in the generally glued to the adjacent layer of capacitor foil are used to protect the capacitor foil package within of the individual capacitors, in particular during their further processing by welding the connecting wires and, if necessary, by Pour in a condenser cup. When winding the output capacitor can be on the inside and / or outside of each Mother capacitor ring also wrapped several layers of cover film will.  

The transport tape is used to remove the individual capacitors sawing the mother capacitor rings or ring pieces the same, for example, to an automatic welding machine weld the lead wires where the tape from the individual capacitors is subtracted. If the tape is on the outer layer of cover film is glued on, however Danger that the layer of cover film, even if with the bordering capacitor film layer is glued, at least partially is deducted. As a result, the cover film layer can be No longer perform the protective function and the capacitor foil layer is exposed so that it is in the further processing of the capacitor can be mechanically damaged. In addition, at Peel off the cover sheet of several adjacent condensers layers of film loosened. These two mistakes can be significant electrical and mechanical failures of the capacitors occur. Furthermore, by pulling off the cover sheet layer, considerable ver work problems that arise during significant downtimes of the Leading machines.

To such an unintentional peeling off of the cover film layer at Peel off the transport tape from the individual capacitors an attempt was made to avoid the adhesive force of the transport Decrease tape. Then, depending on the size and Weight of the individual capacitors more or less the risk that the capacitors detach from the transport tape and from this fall down. On the other hand, if the number of decks film layers is enlarged so that with greater adhesive strength of the Transport adhesive tape when peeling off the outermost layer of cover film ver at least one more cover film layer on the capacitor remains, the component dimensions are increased accordingly, whereby the catalog dimensions are no longer adhered to can.

The object is achieved by the invention, a method of to create the kind mentioned above, by which an unintentional  ch peeling off the cover sheet with the transport tape even at ho Her adhesive strength is avoided.

This is achieved according to the invention in that when winding the off output capacitor between each separation band and at least one of the two this adjacent cover film layers with this also when heating non-sticky tape is wrapped, the sides edges are looped when looping and which along with the transport tape is peeled from the individual capacitors.

From DE-OS 30 15 678 is known, except for the separating tape and the cover sheets between the mother capacitor rings to wrap an additional band. However, this is between the value film and cover film arranged and serves to prevent the value foils from running sideways.

Since in the method according to the invention a tear strip between little at least one cover film layer and the adjacent separating tape is wrapped and the tear-off tape during the manufacture of the layer capacitors the cover film layer not glued, but rather only over the Schoopier layers is connected to the individual capacitors, which via the Tear tape to be glued to the transport tape, the outer one Cover sheet layer when tearing off the tear tape by pulling the Transport tape is not mechanically stressed. Still the fastener supply of the tear tape on the individual capacitors over the Schoopierschich Tough enough to hold even larger components over the tear-off tape to be able to hold the transport safely. Therefore, a transport adhesive tape with high adhesive strength for reliable transport even larger ones Single capacitors are used and it is nevertheless guaranteed that the protective cover layer required for the single capacitor at Peel off the transport tape on the capacitor in the original Layer remains without loosening the capacitor foil layers and thus its Can perform a protective function. Since the tear tape is also pulled off hen the transport tape sticks to it and completely from the Single capacitor is removed, malfunctions in further processing the capacitor, as on the welding machine, avoided. Preferably also in the process according to the invention, the cover film layer with the bordering capacitor foil layer or, if an additional cover foil layer is present, glued to this, which then in turn with the adjacent Condenser film layer is glued. Although other glues are possible are glued by heat sealing during heat treatment prefers. In this case, the cover film layer is on the tear tape  opposite side coated with a heat seal layer.

The tear tape is preferred between the lower cover sheet and the separating tape underneath wrapped because the sawn-off condensate tore on the transport tape in general with its underside be glued. However, it is also possible to add the tear-off tape or alternatively between the top layer of cover film and the one above it Wrapping tape to wrap individual capacitors on a second transport Adhesive tape or with its top instead of its bottom on the trans to be able to stick port tape. The material for the tear tape should be like this be selected that its shrinkage behavior in heat treatment corresponds to that of the capacitor foil strips and the cover foil layer. The thickness of the tear-off tape can be smaller than that of the cover film layer. If, for example, the thickness of the cover film layer is 50 μm, the Ab tear tape have a thickness of 30 microns or less.

The width of the tear-off tape corresponds at least to that of the cover sheet lienlage, whereby this and the tear-off tape are wound congruently. However, the tear-off tape is preferably somewhat wider than the cover film layer, and the tear tape is wrapped so that it is over the cover sheet protrudes evenly on both sides.

The separating tape, the cover film layers and the tear tape between each other the following mother capacitor rings can be as mentioned DE-PS 24 24 368 can be wrapped as a layer package, which has a length which is slightly less than one turn, so that between the beginning and at the end of the layer package, a space remains through which the con capacitor film from the mother capacitor surrounded by the layer package carried out and wrapped over the shift package. This is it does not require the capacitor foil after each winding of a nut disconnect capacitor and rewind over the separating tape. It is however, it is also possible to make the shift package longer and therefore with one wrap substantial overlap of its end portions. The overlap The area of the end sections of the layer package is in particular over a central angle of the mother capacitors of 10-20 °, preferably extends from 12-17 °. By overlapping the end sections of the  Layer packages become the end sections when winding in the overlap area richly pulled tight against each other, so that from the wrapped layer pa ket a closed ring is formed leading to an essential verb improvement of the stability of the output capacitor for its removal from Winding core, which contributes to heat treatment and the Schoopiervorgang.

Such an improvement in the stability of the output capacitor essentially Chem dimensions are already achieved if only the separating tape, which is generally mean a steel band, between successive mother condensate gate rings with a substantial overlap of its end portions is wrapped. To therefore the shock caused by the impact of the beginning of the Overlap area of the layer package on the winding pressure roller ent is to reduce in the method according to the invention, the Ab tear tape and the associated cover sheet layer preferably not between passed through the overlapping end sections of the separating tape, but measured in length so that this is essentially the extent corresponds to a winding turn, and opposite the beginning of the separating belt wrapped so offset that the beginning of the tear tape and the orderly cover film layer close to the end of the separating tape outside the Overlap area of the separating tape is.

An embodiment of the invention is explained below with reference to the drawing, in which in

Fig. 1 half of a wound output capacitor in front view, in

Fig. 2 shows the cross section of a mother capacitor ring between two separation tapes, and in

Fig. 3 shows a detail of the layer package wrapped between successive mother capacitor rings.

Of FIG. 1 during the winding of the output capacitor 1, a steel-release tape 5, then a tear strip 8 and then a cover sheet layer 4 are on a winding core 12 is first wound, which densatorfolienband with at least one Kon and an intermediate dielectric film to be wrapped. After the required number of turns for a mother capacitor ring 2 has been reached , an upper cover film layer 6 , a separating tape 5 , a tear tape 8 and a lower cover film layer 4 for the next following mother capacitor ring 2 are wound thereon. An upper cover film layer 6 is wound again over the last mother capacitor ring 2 , which is wound with a plurality of separating tape layers (not shown) to form an outer casing for the finished output capacitor.

The cover film layers 4 and 6 are coated on their side facing the respective capacitor film layer with a heat sealing layer 11 , so that they are glued to the adjacent capacitor film layer in the subsequent heat treatment.

As seen from Fig. 2, the separation strips have 5 than the one so that the separation belts 5 protrude a greater width of the mother capacitor ring 2 forming the capacitor film strips on both sides uniformly over the mother capacitor ring 2. In the exemplary embodiment, the lower and upper cover foils 4, 6 and the separating tape 8 are wider than the capacitor foil tapes. For example, the width of the capacitor foil strips is 4.5 mm, the width of the cover foil layers 4 and 6 is 4.7 mm, while the width of the tear strip 8 is also 4.7 mm or slightly larger and the separating strip has a width of 5.5 mm.

Fig. 2 shows the mother capacitor ring between the separating tapes 5 after Schoopieren, in which between the separating tapes 5 on both end faces of the mother capacitor rings 2, a Schoopierschicht 7 is applied, which extend over the side edges of the cover film layers 4 and 6 and also the tear tape 8 , so that these are held together by the Schoopierschichten 7 . However, since the tear-off tape 8 is not glued to the adjacent cover film layer 4 , but only over the Schoopier layers 7 with the respective, after removing the separating tapes 5 and sawing the mother capacitor ring 2 with the resulting individual capacitor is connected, the tear-off tape piece of the respective Individual capacitor after gluing with an adhesive conveyor belt when it is removed from the individual capacitor detached from the latter without mechanically stressing the adjacent cover film layer 4 .

Fig. 3 shows the arrangement of an upper cover sheet 6 , a separating tape 5 , the tear-off tape 8 and a lower cover sheet 4 , which are wrapped together as a layer package between successive mother capacitors. In the exemplary embodiment according to FIG. 3, the end sections 9 and 10 of the separating tape 5 overlap. Between the end portions 9 and 10 of the release tape 5, the capacitor film tape 3 is torring from the formed under the upper cover sheet layer 6 Mutterkondensa passed to the next mother capacitor ring. The beginning of the upper cover sheet 6 is slightly above the beginning of the separating tape 5 and the winding end of the upper cover sheet 6 coincides in its position with the start of its winding. The tear-off tape 8 and the lower cover sheet 4 above the separating tape 5 lie with their Wickelan start just outside the overlap area of the end portions 9 and 10 of the separating tape 5 , whereas they protrude somewhat with their winding end over the winding end of the separating tape 5 .

Claims (4)

1. A method for producing layered film capacitors, in which an output capacitor with a plurality of mother capacitor rings of large diameter, wound one above the other, is wound from at least one capacitor foil strip and under each mother capacitor ring at least one lower cover foil layer and an underlying separating strip, and above each mother capacitor ring at least one upper cover foil layer and an overlying one Separating tape are wrapped, the output capacitor is subjected to a heat treatment, coated on both faces with a layer of Schoopier and rings in the mother capacitor or parts thereof, which are sawn into individual capacitors, which are glued on the cover sheet layer on a transport tape, which after transferring the Individual capacitors are withdrawn from these in a further processing station, characterized in that when the output capacitor ( 1 ) is wound between each isolating strip d ( 3 ) and at least one of the two adjacent cover film layers ( 4, 6 ), a tear-off tape ( 8 ) which is also adhesive with this during heat treatment, is wrapped, the side edges of which are also looped during Schoopieren, and which are pulled off together with the transport adhesive tape from the individual capacitors becomes. 2. The method according to claim 1, characterized in that the cover film layer ( 4, 6 ) is coated on its side facing away from the tear-off tape ( 8 ) with a heat seal layer ( 11 ). 3. The method according to claim 1 or 2, characterized in that the tear-off tape ( 8 ) is kept somewhat wider than the cover sheet layer ( 4, 6 ) and protrudes on both sides when winding over this. 4. The method according to any one of claims 1 to 3, characterized in that the separating tape ( 5 ) between successive mother capacitor rings ( 2 ) with a substantial overlap of its end portions ( 9, 10 ) is wrapped, the tear-off tape ( 8 ) and assigned cover film layer ( 4, 6 ) end outside the overlap area of the separating tape ( 5 ).