DE2144948A1 - Static Elimination Arrangement and Process for Producing it - Google Patents

Description

Patent attorneys

Dipl. Ing. Jürgen Rost
B Munich 13, Tengstr. 39, Tel 37id48 ft. SßD 197t

iiGer sign II 4771

tfiraia UEKTROlT July 11th, Gent / Belgium, 171 G-asineterlaan

"Statutory Elimination Order and Process for Producing it."

The invention "relates to arrangements for evacuation static charges and "relates to such arrangements as they" in the manufacture of paper, plastic webs or other sheet-like textile materials can be used.

In many manufacturing processes, a sheet material is used guided over rollers or by stripping elements and at With this method, the web can be charged with static electricity take up. For many operations it is desirable to have a charge free web or sheet for handling of the material and the possibility of a static discharge «wiping the web and other components

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avoid ments. In addition, it may be necessary for the finished web material to be delivered in a charge-free state. In any of the above, the removal of static charge can be accomplished by moving the web in close proximity to a charge removal arrangement. _%

A number of charge disposal arrangements are known and in use. Such an arrangement consists of a high-voltage cable, which has a plurality of pointed emitter pegs, the side. protrude along one side of the ladder. A high voltage conductor in the cable is capacitively coupled to each of the emitter pins via insulation. The cable lies in a grounded cylindrical metal jacket »which has a longitudinal slot. The emitter pegs protrude from the cable through the longitudinal slot to an area close to the path transported over the pegs allows Dep ears by the static charge from the sheet, the grounded metal sheath. In this way, all of the static charge can be removed from the web.

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ORIGINAL INSPECTED

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(The term "peak emitter pins ^'1 or ⁿ emitter tips ^1' is to be interpreted in the description and in the claims as _f that, einschließet conical stud or pin having a small diameter rounded end surfaces or the like which permit a corona discharge ·)

Even if the known arrangements for discharging static charges are satisfactory with regard to their operating properties, the costs of the known arrangements, in particular a coaxial arrangement, are considerable. A predetermined uniform capacitive coupling must be ensured between the high voltage conductor and the emitter pins and this affects the manufacturing costs. Accordingly, it is desirable to provide an arrangement for discharging static charges which can be manufactured more cheaply than the rails known heretofore and without substantial difficulties in achieving uniformity of the capacitive coupling in the rail.

According to the invention, there is a layered discharge arrangement Created for static charge, which is a base part Insulating material with a predetermined thickness between the opposite side surfaces of the strip for adjustment " development of a given capacitance between the side faces of the part, with a continuous element made of conductive

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tending material on one side of the base and a number of ionizing elements on the other side of the Base part are attached and the ionizing elements are formed from a conductive material with a protruding tip.

The invention also provides a method of manufacturing a layered splint as a discharge assembly for static Charge, the method consisting in placing a continuous element of conductive material on one side a strip of non-conductive material is attached, a number of electrically conductive ionization elementseii is formed and this number of ionizing el em ent s on the opposite side of the strip of non-conductive material is attached.

The invention is described below with reference to the drawings using an exemplary embodiment of a layered rail as Arrangement for discharging static charges, as well as the method of production described.

In the drawings show:

Pig. 1 shows a cross section through a known coaxial rail for dissipating static charges in a jacket made of grounded metal to discharge the static charge from a, material web,

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Figure 2 is a side view of the layered rail according to the invention as an arrangement for discharge static charges, with sections of the individual layers removed,

Pig. 3 is a cross-section through the layered rail along the line 3-3 in Figs. 2 and

4 shows a side view of two connected to one another Ionization elements in an intermediate stage of the Manufacturing.

For a better understanding of the operation and the mode of operation The layered rail for discharging static charges according to the invention is first a known arrangement shown in Fig. 1 in the working position. The layered rail for discharging the static charge according to the The invention is intended to replace this known coaxial rail in the same operating arrangement.

Fig. 1 shows a material web F, which is guided in the direction indicated by the arrow over the coaxial rail 1o shown in cross section for discharging static charges. The web F can be any film, for example bahnartigea of paper or plastic or other I ¹ be textile material during manufacture or

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other processes can absorb a static charge. The web F can acquire such a charge by frictional contact with other components such as rollers, sliders or get brushes. This static charge taken up in the web F can affect the subsequent handling of the Interfere with the film by abscess or attraction forces. The charge itself can occur when applying coatings or when Moistening of the film by liquids interferes with a given manufacturing process. The static discharger can be used as the final step in the manufacturing process so that the web is transported away after completion without any static charge. The unloader can simply remove the static charge before it reaches a level that could cause damage or possibly a causes dangerous discharge between the film and surrounding components.

The known coaxial discharger 1o consists essentially made up of a central high-voltage conductor 12 and a number of ionization pins 14 with discharge tips 16. The ionizing pins 14 are in series along one side arranged by the Abftihrers and protrude radially through an outer layer 18 of their insulating material. Every cone 14 is press fit at its inner end in a corresponding one Ring 20 attached. The pins 14 and the rings are metallic elements and therefore electrically conductive.

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The ring 20 is coaxial with the high-voltage conductor 12 and is separated from this conductor 12 by an inner insulating layer 22 separated. The radial thickness of the Schidt 22 is chosen so that the capacitive coupling 'between the Conductor 12 and the ring 20 at the discharge tip 16 of the Pin 14 generates high voltage "and a corona discharge in the area of this tip" causes »The thickness of the layer 22 must be so large that it prevents a direct discharge between the conductor 12 through the layer 22 and thus changes with the dielectric constant of the Iso-Ii e materials.

The coaxial rail 10 must be transverse to the track F in a grounded metallic dumbbell 24 be attached by bracket, not shown. The pins 14 jump radially through a longitudinal slot 26 on one side of the jacket 24 in front. The plurality of pins 16 and the associated rings 20 are in series mounted along the coaxial rail 12. Each element consisting of a pin and a ring is electrical from isolated from the other elements. The separation between the tenons and the number of rings is chosen so that the static charge is removed over the entire surface of the film

In operation, the high-voltage conductor 12 is connected to an alternating current source, e.g. a source that is 800-10,000 Y at 60 to

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50 Htz supplies, connected. The capacitive coupling of the conductor 12 with a ring 2o and pin 14 via the layer 22 increases the voltage at the emitter tips to a value which ionizes the air around the tips 16 of the pin 14. The ionized air forms a conduit. so that static charges from the web F are discharged kön- NEN away between the sheet F and the grounded casing 24 _»t when this passes close to the emitter tips 16 · The static charge is removed from the film by the ionized gas and the jacket 24 safely withdrawn before the charge disturbs or damages the film. Even if the known static discharger in the form of a coaxial rail works essentially in the same way as the layered discharger according to the invention, the coaxial construction is much more expensive and requires more space to achieve the same effect. The definition of the individual tenons with rings at points lying in series along the coaxial conductor and the formation of the coaxial insulating layers requires a more laborious manufacturing process than can be achieved by a layered construction The layered construction, which has a flat shape, is well suited to design and adjust the capacitive coupling between the high-voltage conductor and the emitters and requires considerably less space to achieve the same static discharge effect in a discharge jacket similar to the dumbbell 24 according to FIG. 1.

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The layered static discharge bar 3o according to FIG the invention is in Pig. 2, with sections of the individual layers are removed to show the internal structure. The complete Schicht construction is in Cross-section in Fig. 3 shown.

The inner layer of the laminate construction is a strip 32 of insulating material which forms a base with limited Forms stiffness on which the other layers are built. This base strip 32 can be an epoxy fiberglass be of a thickness which is primarily adjusted so that there is sufficient insulation between the high-voltage « Conductor 34 and the number of ionizing tip plates 36 results. The bending stiffness of the layered structure is im "./seritlichen through the thickness of the base strip 32 and cle3 conductor 34 determined. Between the base strip 32 and the high-voltage conductor 34 is another layer 38 made of epoxy fiberglass, which is in connection with the outer layer 4o made of fiberglass for attaching the high voltage conductoro 34 on the base strip 32 is used. Layer 38 can be attached optionally. It can also simply be a part of the base strip 32. The head 34 is a Strip of highly conductive material such as brass or copper and runs continuously along one side of strip 32. The conductor 34 is dimensioned to have a width which is less than that of the strip 32, so that it runs along an edge

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one edge of the strip 32 for attaching the coated Splint close to ejunem film, like the coaxial splint 1o according to Pig. 1, is formed. The layered construction is completed by a second insulating layer 32, which plates the free surface of the discharge 36 covers.

The discharge plates 36 have a flat configuration, with the emitters 44 from one side of a rectangular body part the plate 36 protrudes. The protruding ends 46 of the emitters 44 are tapered to accept gas in the same way to ionize like the tips 16 of the pin 14 of the known. Unloader 1o according to FIG. 1. The plates 36 are on one side of the base strip 32 attached and aligned so that they are directly opposite the high voltage conductor 34 =. The width of the conductor 34 and the dimensions parallel to it * the plates are essentially the same and therefore a construction is created which is similar to that of a conventional plate capacitor that is formed between the conductor 34 and each of the plates 36. The thickness of the base strip 32 and the additional layer 38 determines the capacitance between the plate 36 and the conductor 34 · The essentials Features in this regard are the separation between the plates and the conductor and the dielectric constant of the \ intermediate material, as these are fundamental factors the short circuit voltage between conductor 34

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the plates 36 determine. The tension that is necessary in order to produce a corona ring around the emitter tips 46, it has to be comparatively high, as a rule 800-10,000 volts. Therefore, the thickness of the base strips 32 and the others intermediate layers chosen so that they result in a corresponding electrical insulation without flashover, which lead to dangerous errors in the discharge rail can.

The layered rail 3o can be attached in a number of ways. Like in Pig. 2 may have a number of openings 5o along the edge at the top of the Base strip 32 be attached. These openings 50 can also through the layers 33 »40 and 32 made of insulating material lead so that fastening screws 52 are inserted through the rail and screwed into mounting brackets can be. If the fastening openings 5o too tight are on conductor 34, the conductor can have cutouts 54 in have the adjoining conductor section in order to achieve a corresponding electrical insulation.

At one end the conductor 34 is provided with a connector 56 for connecting the rail 3o to a corresponding source of alternating current connect to. The connector 56 may be crimped, clamped, or soldered to the conductor 34 to form a To create connection for the high-voltage alternating current with low resistance and low capacitance.

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One of the most essential door parts of the layered unloader is the low cost of construction due to the unistand that a simpler assembly is possible. Basically, each of the elements is independent Layer, which only needs to be layered together in a common construction The arrangement and division of the individual components is more difficult for coaxial constructions of the known type and must be controlled more closely to maintain manufacturing accuracy. However, it is useful "advantageous To consider methods by which the geschich ended discharge rail according to the invention can be produced.

First, the base strip 32 of epoxy fiberglass is placed side by side with the strip 34 of conductive material by means of the fiberglass insulating layers 38 and 40. The epoxy fiberglass of both strips respectively. Layers 38 and 40 can easily be cast and molded onto conductor 34 when the epoxy is in an uncured state, commonly referred to as the B-stage. The conductor strip 34 is generally placed between the side edges of the base strip 32, leaving a sufficient margin on one side of the strip to allow attachment holes 5o to be made. The Löoher can

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while forming the fiberglass together with the conductor 4-O are formed because the cutouts 54 in the ladder must match the openings. Of course the fastening screws can be removed from the conductor 34 also insulated if the .mounting openings lie completely in the conductor 34, whereby a sufficient conductor cross-section must be provided.

The next step in the manufacturing process for the Discharge bar 3o is the attachment of the plurality of emitter plates 36 to the side of the base strip opposite the one Conductor 34 · As can be seen from the above description of the operation of the discharge bar 3o, the emitter plates 36 at selected locations along the base strip 32 and directly opposite the conductor 34 for the most effective Capacitive coupling between conductor 34 and to reach the plates 36. In addition, the precise arrangement of the plates 36 is also required so that the Emitter tips 46 of each plate 36 substantially in the the same plane so that the distances between the individual emitter tips and the path to be discharged are the same are when the rail 3o is attached close to the track. It can be readily seen that the arrangement of each plate 36 with the emitters 44 individually in a precise position 'would be a time consuming and difficult step in the manufacturing process. Accordingly, the plates 36 with the

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integrally molded emitters 44 made of a single strip of conductive material, e.g. Corrosion-resistant steel, made by punching all the plates at the same time as the bridge sections connecting the plates. Vie from Pig. Can be seen 4, in which the plates are shown in reduced scale, 6o extend the connecting portions between the emitters 44 of adjacent Platter .. ψ A die for punching of these plates can be easily manufactured and is suitable for the rapid production of a plurality of interconnected plates. Of course, a chemical etching process can also be used in the same way to produce the connected plates.

Attaching the multitude of to one another on their emitters connected panels can be easily made by placing the connected Panels are made on the base strip directly opposite the ladder 34. The spacing and orientation of the Plate is kept uniform by the bridging portions 6o.

When the panels are placed exactly, the outer layer becomes 42 made of epoxy fiberglass on the outer surface of the Plates placed. The entire layered construction is then placed in a mold and applied by applying Heat and pressure held for a predetermined period of time,

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so that the epoxy hardens in the fiberglass. It is beneficial to leave the connecting sections 60 between the individual plates 36 during the hardening process, so that the alignment and arrangement of the plates is not gectört before the epoxy has hardened.

"Db.ü removing About b backwards from sections 60 after curing is carried out so that the points v 46 QQ mäös Fig. 2 formed / ground by trimming the emitter along the dashed lines in Fig x 4". Un the pointed emitter cut , a separate cutting die can be used or the emitters can be partially severed from the bridging sections 6o during the original stamping of the plates in order to weaken the connection between the emitters and the bridging sections on the dashed lines in FIG Then take place after the fiberglass has hardened. Since the connection sections 60 determine the distance and the sighting of the plates 36 during the hardening process, the alignment of the plates is uniform, the extent to which the emitter 44 over the upper edge of the Baaisstreifens becomes finer 32 protrude, as shown in lig. 2, ensured with greater uniformity.

Aue the Yorherewaftta can be seen that the new stratified Sta $ iiolie »ntlader with accuracy and fast can be produced without »« «compromising quality.

The assembly of the individual components of the unloader 3o can be done by customary procedures and is not afflicted with many of the difficulties of the known arrangement. Additionally needed the finished layered discharge bar considerably less space, with the same • before puncture as the well-known coaxial discharge rails fulfill.

Because the new static discharge bar is a layered one It can be easily assembled by assembling the splint from the base strip in a series of simple operations getting produced. The high-voltage conductor element is placed on one side of the base strip and the ionizing elements on the opposite side or on both sides des Streifens «In order to facilitate the handling and adjustment of the large number of ionizing elements, these fc elements punched out of a single strip of material and there remain bridging sections between the adjacent " elements lying one above the other, so that all elements are connected to one another. In this way can be a plural}. from Elements are handled as a single strip while the elements are installed. The connections between the elements can be removed after they have been inserted are. The base strip made of insulating material and the outer layer made of insulating material can first consist of uncured epoxy fiberglass, so that the finished

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tete construction due to the later hardened epoxy resin is held together.

Of course, numerous modifications can be made by those skilled in the art and make additions in the design and manufacture of the new stratified discharge bar, e.g. instead of the described epoxy fiberglass as the base material for the production of the insulation between the conductor 34 and the plates 36 other fiber-reinforced or Plastic materials as substrates with electrical components are used with equally satisfactory results. The materials from which the conductor 34 and The plates 36 made can also be changed so long as the electrical characteristics of the material be respected. Of course, the order in which the strips 32, 34 and the connected Plates 36 are assembled prior to curing, can be changed. In certain! Cases it may be desirable Your, the connecting strips 6o immediately after a Number of plates 36 is attached to remove so that the Yorbindungsabüchnittü 6o do not interfere in the hardness form » The three insulating layers 4o and 42 do not have to be off fieni the same insulating material as the dicci between the conductor 34 and the plates 36 may be lying. In some cases it can there is no need for insulation. In certain cases

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it may be advantageous to place the conductor 34 in the base strip 32, or embed the conductor 34 first between two layers of insulation that make up the base strip form. In this case, the discharge plates 36 be arranged on both sides of the conductor 34, with a staggering of the emitters 34 along the layered Rail is reached.

Expectations

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Claims (1)

2U4948 -19- An3priich.e 1.)) Stratified static discharger, characterized by a strip egg-like base part (32) made of insulating material a predetermined thickness between the opposite sides of the strip such that a given capacitance is set between the sides of this part, a continuous element (34) of conductive material on the one side of the base part (32) and a number of ionizing elements en (36) on the other side of the base part (32), wherein each of the ionization elements (36) consists of one conductive material and has a tip (44) protruding therefrom 2.) Stratified static discharger according to claim 1, characterized characterized in that the conductor core (34) is in the insulating base (32) is embedded and the ionizing elements (36) attached to both sides of the base part (32) are. 3 ·) Stratified static discharger according to claim 2, characterized in that the base part consists of two insulating layers is made and the conductor element (34) is embedded between these two insulating layers. 209813/1069 2UA9A8 -2ο- 4 ·) -Layered static discharger according to claim 1, 2 or "3», characterized in that the plurality of ionizing elements (36) are electrically isolated from each other « 5) Stratified static discharger according to one of the preceding claims, characterized in that the plurality of ionizing elements (36) are distributed at intervals along the side or sides of the base part (32) o 6.) Stratified static discharger according to one of claims 2 or 3> characterized in that the plurality of ionizing elements are along both sides of the base are staggered. 7 ·) Stratified static discharger according to one of the preceding Claims, characterized in that the ionizer uiigs elements are plates (36) which are parallel to the continuous conductor element (34) are arranged, v / o "at the Plates (36) and the conductor element (34) are capacitatively coupled through the base part (32). 8.) Stratified static discharger according to claim 7 »characterized in that the plates (36) are rectangular Have training, v. One side of which accordingly the width of the continuous conductor element (34) is dimensioned. 209813/1069 9 ·) G-layered static discharger according to claim 7 or 6, characterized in that the tips (4Φ, 4o ') of the Urifaiio of the plates (36) beyond the base part (32) protrude. 10o) G-layered static discharger according to one of the The preceding claims, characterized in that a further layer (4o) made of electrical insulating material is provided which is the exposed surface of the passing egg Element (34) made of conductive material covers. 11.) G-eschichteter static discharger according to claim 1o, characterized in that a further layer (42) of electrical insulating material covers the exposed surfaces the ionization elements (36) covers. 12.) A method for producing a layered static discharge bar, characterized by the arrangement of a continuous Element made of conductive material on one side oix.ea strip of non-conductive material, forming a Number of electrically conductive ionization elements and attaching said plurality of ionizing elements to the opposite side of the strip of non-conductive em material 209813/1069 13 ·) Method for manufacturing a layered static discharge bar according to claim 12, characterized in characterized in that the plurality of ionizing elements are formed with connecting portions which the Connect elements to one another, the connecting sections after the elements have been attached to the non- ^ conductive strips are removed. 14.) Method for producing a layered static discharge rail according to claim 13, characterized in that, that the connected ionizing elements a strip of conductive metal. 15 ·) Method of manufacturing a layered static discharge bar according to any one of the preceding Claims 12-14, characterized in that an insulating material is applied to the exposed surface of the conductor element and the ionization element is applied after the conductor element and the ionization elements on opposite sides of the non-conductive strip. 16.) The method initially fabricating a laminated static Entladerschiene according to any one of the preceding claims 12-14, characterized in that an insulating layer of uncured $ e Epoxifit "erglas on the 209813/1069 21U948 Ionisierungseleneiite and / or the conductor element opposite sides of the non-conductive strips is applied and the epoxy fiberglass with the layered Splint is hardened under pressure " 17 ·) Method for producing a layered static discharge rail according to claim 16, characterized in that ", that the connecting portions are removed after hardening. 18.) A method for producing a layered static discharge rail according to claim 12, characterized in, that a second strip of non-conductive material on the opposite side of the continuous Element of the conductive material attached and a number of ionizing elements on both sides of the sun molded layer construction attached v / ground. 209813/1069 Blank page