WO1987003076A1 - Process and device for transporting printed circuit boards through drying installations - Google Patents

Process and device for transporting printed circuit boards through drying installations Download PDF

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Publication number
WO1987003076A1
WO1987003076A1 PCT/DE1986/000457 DE8600457W WO8703076A1 WO 1987003076 A1 WO1987003076 A1 WO 1987003076A1 DE 8600457 W DE8600457 W DE 8600457W WO 8703076 A1 WO8703076 A1 WO 8703076A1
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WO
WIPO (PCT)
Prior art keywords
circuit boards
holding arms
printed circuit
threaded spindle
plate holder
Prior art date
Application number
PCT/DE1986/000457
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German (de)
French (fr)
Inventor
Erich Weber
Original Assignee
Erich Weber
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Filing date
Publication date
Application filed by Erich Weber filed Critical Erich Weber
Publication of WO1987003076A1 publication Critical patent/WO1987003076A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/30—Details; Auxiliary devices
    • B65G17/32—Individual load-carriers
    • B65G17/326—Clamps, constituted by articulated chain links
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/02—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle
    • F26B15/08—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle in a vertical plane
    • F26B15/085—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in the whole or part of a circle in a vertical plane with endless clamp or tray conveyor, e.g. wicket conveyor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/227—Drying of printed circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/02—Articles

Definitions

  • the invention relates to a method for transporting printed circuit boards through drying systems in which the printed circuit boards are only held at opposite edges.
  • the invention further relates to a device for performing this method.
  • the object of the invention is to keep the coated surfaces of different plate formats and different plate thicknesses contact-free in the work surfaces during the entire transport route through the transport system.
  • This object is achieved in accordance with the method according to the invention essentially in that the holding arms of the plate holder are automatically adjusted to the respective width of the circuit boards before the circuit boards enter the drying system.
  • This is preferably carried out according to the invention in such a way that the printed circuit board width is queried automatically and the result of the polling is the setting of the.
  • Control arms of the plate holder controls.
  • the method according to the invention can practically be carried out with various types of devices.
  • a simple device of this type consists, for example, according to the invention in that the holding arms of the plate holder can be adjusted by means of threaded spindles. Instead of the threaded spindles, the holding arms can also be adjusted by actuating pressure medium such as pneumatic or hydraulic piston-cylinder devices.
  • the loading point of the circuit boards is usually horizontal. Between the holding arm adjustment point and the loading point is z. B. a certain number of plate holders. This number of board holders determines which board width must be queried so that the board and board holder are coordinated.
  • the holding arms can be designed in different profiles.
  • a lying [profile is z. B. selected for rigid circuit boards. The edge zones of such printed circuit boards are not coated.
  • a lying, diagonally open -Profile is suitable for printed circuit boards with an uncoated edge zone that is too small.
  • a profile with a clamping device is used for flexible printed circuit boards.
  • the invention is illustrated for example in a horizontal drying plant.
  • Fig. 1 shows a schematic side view of the drying plant
  • Fig. 2 shows a plan view of the inlet part of the drying system along the line AB of Fig. 1 on an enlarged scale.
  • the heatable horizontal drying system shown in FIG. 1 consists, for example, of an insulating jacket 1 in which there are several fans 2 which are driven by motors 3 and blow the heated air into the interior of the dryer via air channels 4.
  • a circulating transport system 5 is arranged inside the dryer 1. This consists of a left and a right transport chain 6, which run around sprockets 7 and 8. Angle plates 10 are attached to the chain links 9 of the chains 6 and carry the plate holders 11. The revolving chains 6 with the plate holders 11 are driven by an electric motor 12.
  • the circuit boards 13 to be dried are fed in according to FIG. 1 on the right-hand side, and the outlet thereof on the left-hand side of the dryer 1 in the direction of the arrows shown.
  • circulating conveyor belts 14 are provided, for example, which are driven by motors 15.
  • the conveyor belts 14 extend into the deflection areas of the plate holder 11. Outside the dryer jacket 1, the width of the printed circuit board 13 is determined. This can be done, for example, with the aid of sensors 16, which contactlessly scan the printed circuit boards 13, such as, for. B. photocells.
  • Each plate holder 11 consists, for example, of FIG. 2, of mutually opposite holding arms 17 with an angular profile, which hold the printed circuit boards 13 with their horizontal legs 17 '.
  • the holding arms 17 are mutually displaceable in the direction of the arrows.
  • This threaded spindle carries a driver 20 at one end, which can be detachably coupled with a left-hand or right-hand drive.
  • This drive device is arranged in a stationary manner in the dryer and is brought into engagement with the driver 20 in each case during the waiting times of the dryer cycles and released again after the holding arm 17 has been adjusted.
  • the threaded spindle 19 is rotatably mounted on both sides in the angle plates 10 of the transport chains 6.
  • a rotation of the holding arms 17 is prevented by the fact that the holding arms 17 can be displaced on a longitudinal guide 22 by means of sliding bushes 21, 21 '.
  • the holding arms 17 must be adjusted to the correspondingly smaller width 17', which is indicated in FIG. 2 with dash-dotted lines. This is done again with the help of the threaded spindle 19 in the manner described above. In the same way, the holding arms of the plate holder can be automatically adjusted to the PCBs that are brought up.
  • the device according to the invention works analogously to the description above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

For the transport through drying installations of printed circuit boards with various widths, the printed circuit boards being held by opposite edges only, the retaining arms or board holders are by themselves or automatically adapted to the width of each printed circuit board before they enter into the drying plant.

Description

Verfahren zum Transportieren von Leiterplatten durch Trocknungsanlagen und Vorrichtung zur Durchführung dieses Verfahrens. Process for transporting printed circuit boards through drying systems and device for carrying out this process.
Die Erfindung betrifft ein Verfahren zum Transportieren von Leiterplatten durch Trocknungsanlagen, bei denen die Leiterplatten nur an gegenüberliegenden Rändern gehalten werden. Ferner betrifft die Erfindung eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a method for transporting printed circuit boards through drying systems in which the printed circuit boards are only held at opposite edges. The invention further relates to a device for performing this method.
In der Leiterplattenherstellung müssen frisch beschichtete, z. B. bedruckte oder gegossene Leiterplatten getrocknet werden. Solche Leiterplatten werden häufig auf beiden Seite beschichtet. Die Oberflächen dieser Leiterplatten sind sehr empfindlich und müssen möglichst schonend behandelt werden. Um die Fertigung automatisch zu gestalten, müssen Transportmittel eingesetzt werden, welche diese Forderung erfüllen. Im Trocknerbereich sind Fächertrockner als Durchlauftrockner im Einsatz. Diese arbeiten in horizontaler oder vertikaler Bauform.In the production of printed circuit boards, freshly coated, e.g. B. printed or cast printed circuit boards can be dried. Such circuit boards are often coated on both sides. The surfaces of these circuit boards are very sensitive and must be treated as gently as possible. In order to design the production automatically, means of transport must be used that meet this requirement. Fan dryers are used as continuous dryers in the dryer area. These work in a horizontal or vertical design.
In vielen Betrieben werden unterschiedliche Leiterplattenformate bearbeitet, z. B. in mehreren verschiedenen Breiten. Der Erfindung liegt die Aufgabe zugrunde, die beschichteten Flächen von verschiedenen Plattenformaten und verschiedener Plattenstärke während des gesamten Transportweges durch die Transpor-tanlage in den Arbeitsflächen berührungsfrei zu halten.Different PCB formats are processed in many companies, e.g. B. in several different widths. The object of the invention is to keep the coated surfaces of different plate formats and different plate thicknesses contact-free in the work surfaces during the entire transport route through the transport system.
Diese Aufgabe wird gemäß dem Verfahren nach der Erfindung im wesentlichen dadurch gelöst, daß die Haltearme der Plattenhalter vor dem Eintreten der Leiterplatten in die Trocknungsanlage selbsttätig auf die jeweilige Breite der Leiterplatten eingestellt werden. Vorzugsweise wird dies erfindungsgemäß in der Weise ausgeführt, daß die Leiterplattenbreite automatisch abgefragt wird und das Ergebnis der Abfragung die Einstellung der. Haltearme der Plattenhalter steuert. Das Verfahren gemäß der Erfindung kann praktisch mit verschiedenartigen Vorrichtungen ausgeführt werden. Eine einfache Vorrichtung dieser Art besteht beispielsweise erfindungsgemäß darin, daß die Haltearme der Plattenhalter mittels Gewindespindeln verstellbar sind. Anstelle der Gewindespindeln kann eine Verstellung der Haltearme auch durch Druckmittelbetätigung w. z.B.pneumatische oder hydraulische Kolben-Zylindervorrichtuήgen erfolgen.This object is achieved in accordance with the method according to the invention essentially in that the holding arms of the plate holder are automatically adjusted to the respective width of the circuit boards before the circuit boards enter the drying system. This is preferably carried out according to the invention in such a way that the printed circuit board width is queried automatically and the result of the polling is the setting of the. Control arms of the plate holder controls. The method according to the invention can practically be carried out with various types of devices. A simple device of this type consists, for example, according to the invention in that the holding arms of the plate holder can be adjusted by means of threaded spindles. Instead of the threaded spindles, the holding arms can also be adjusted by actuating pressure medium such as pneumatic or hydraulic piston-cylinder devices.
Die Beschickungsstelle der Leiterplatten liegt im Normalfall horizontal. Zwischen der Haltearm-Verstellstelle und der Beschickungsstelle befindet sich z. B. eine bestimmte Anzahl von Plattenhaltern. Diese Anzahl der Plattenhalter bestimmt, welche Leiterplatten-Breite abgefragt werden muß, damit Leiterplatten und Plattenhalter aufeinander abgestimmt werden.The loading point of the circuit boards is usually horizontal. Between the holding arm adjustment point and the loading point is z. B. a certain number of plate holders. This number of board holders determines which board width must be queried so that the board and board holder are coordinated.
Die Ausführung der Haltearme kann in verschiedenen Profilen erfolgen. Ein liegendes [ -Profil wird z. B. für starre Leiterplatten gewählt. Die Randzonen solcher Leiterplatten sind nicht beschichtet. Ein liegendes, schräg offenes
Figure imgf000006_0001
-Profil ist für Leiterplatten mit zu kleiner unbeschichteter Randzone geeignet. Ein Profil mit Klemmvorrichtung wird bei flexiblen Leiterplatten eingesetzt.The holding arms can be designed in different profiles. A lying [profile is z. B. selected for rigid circuit boards. The edge zones of such printed circuit boards are not coated. A lying, diagonally open
Figure imgf000006_0001
-Profile is suitable for printed circuit boards with an uncoated edge zone that is too small. A profile with a clamping device is used for flexible printed circuit boards.
In der Zeichnung ist die Erfindung beispielsweise bei einer horizontalen Trocknungsanlage veranschaulicht.In the drawing, the invention is illustrated for example in a horizontal drying plant.
Fig. 1 zeigt eine schematische Seitenansicht der Trocknungsanlage, undFig. 1 shows a schematic side view of the drying plant, and
Fig. 2 zeigt eine Draufsicht des Einlaufteiles der Trocknungsanlage nach der Linie A-B der Fig. 1 in vergrößertem Maßstab. Die in Fig. 1 gezeigte, beheizbare horizontale Trocknungsanlage besteht bspw. aus einem Isoliermantel 1, in dem sich mehrere Ventilatoren 2 befinden, die von Motoren 3 angetrieben werden und die erhitzte Luft über Luftkanäle 4 in das Innere des Trockners blasen.Fig. 2 shows a plan view of the inlet part of the drying system along the line AB of Fig. 1 on an enlarged scale. The heatable horizontal drying system shown in FIG. 1 consists, for example, of an insulating jacket 1 in which there are several fans 2 which are driven by motors 3 and blow the heated air into the interior of the dryer via air channels 4.
Im Inneren des Trockners 1 ist ein umlaufendes Transportsystem 5 angeordnet. Dieses besteht aus einer linken und einer rechten Transportkette 6, welche um Kettenräder 7 und 8 laufen. An den Kettengliedern 9 der Ketten 6 sind Winkellaschen 10 befestigt, welche die Plattenhalter 11 tragen. Die umlaufenden Ketten 6 mit den Plattenhaltern 11 werden von einem Elektromotor 12 angetrieben.A circulating transport system 5 is arranged inside the dryer 1. This consists of a left and a right transport chain 6, which run around sprockets 7 and 8. Angle plates 10 are attached to the chain links 9 of the chains 6 and carry the plate holders 11. The revolving chains 6 with the plate holders 11 are driven by an electric motor 12.
Der Einlauf der zu trocknenden Leiterplatten 13 erfolgt gemäß Fig. 1 auf der rechten Seite, der Auslauf derselben auf der linken Seite des Trockners 1 in Richtung der eingezeichneten Pfeile. Zu diesem Zweck sind beispielsweise umlaufende Transportbänder 14 vorgesehen, die von Motoren 15 angetrieben werden. Die Transportbänder 14 reichen bis in die Umlenkbereiche der Plattenhalter 11. Außerhalb des Trocknermantels 1 wird die Breite der Leiterplatte 13 ermittelt. Dies kann beispielsweise mit Hilfe von Sensoren 16 geschehen, die die Leiterplatten 13 berührungslos abtasten, wie z. B. Photozellen.The circuit boards 13 to be dried are fed in according to FIG. 1 on the right-hand side, and the outlet thereof on the left-hand side of the dryer 1 in the direction of the arrows shown. For this purpose, circulating conveyor belts 14 are provided, for example, which are driven by motors 15. The conveyor belts 14 extend into the deflection areas of the plate holder 11. Outside the dryer jacket 1, the width of the printed circuit board 13 is determined. This can be done, for example, with the aid of sensors 16, which contactlessly scan the printed circuit boards 13, such as, for. B. photocells.
Jeder Plattenhalter 11 besteht beispielsweise gemäß Fig. 2 aus einander gegenüberliegenden Haltearmen 17 mit winkelförmigem Profil, die mit ihren waagerechten Schenkeln 17' die Leiterplatten 13 aufnehmen. Die Haltearme 17 sind in Richtung der eingezeichneten Pfeile gegeneinander verschiebbar. Zu diesem Zweck sind an den Enden der Haltearme 17 Gewindebuchsen 18, 18' befestigt, welche mit Links- bzw. Rechtsgewinde versehen sind. Die Gewindebuchsen 18, 18' sind mit einer Gewindespindel 19 mit Links- bzw. Rechtsgewinde verschraubt. Diese Gewindespindel trägt an einem Ende einen Mitnehmer 20, der mit einem links- bzw. rechtsdrehenden Antrieb lösbar gekuppelt werden kann. Diese Antriebsvorrichtung ist in dem Trockner stationär angeordnet und wird in den Wartezeiten der Trocknertakte jeweils mit dem Mitnehmer 20 in Eingriff gebracht und nach erfolgter Verstellung der Haltearm 17 wieder gelöst. Die Gewindespindel 19 ist beiderseits in den Winkellaschen 10 der Transportketten 6 drehbar gelagert.Each plate holder 11 consists, for example, of FIG. 2, of mutually opposite holding arms 17 with an angular profile, which hold the printed circuit boards 13 with their horizontal legs 17 '. The holding arms 17 are mutually displaceable in the direction of the arrows. For this purpose 17 threaded bushings 18, 18 'are attached to the ends of the holding arms, which are provided with left and right hand threads. The threaded bushings 18, 18 'are with a threaded spindle 19 screwed to the left or right-hand thread. This threaded spindle carries a driver 20 at one end, which can be detachably coupled with a left-hand or right-hand drive. This drive device is arranged in a stationary manner in the dryer and is brought into engagement with the driver 20 in each case during the waiting times of the dryer cycles and released again after the holding arm 17 has been adjusted. The threaded spindle 19 is rotatably mounted on both sides in the angle plates 10 of the transport chains 6.
Eine Verdrehung der Haltearme 17 wird dadurch verhindert, daß die Haltearme 17 mittels Gleitbuchsen 21, 21' auf einer Längsführung 22 verschiebbar sind.A rotation of the holding arms 17 is prevented by the fact that the holding arms 17 can be displaced on a longitudinal guide 22 by means of sliding bushes 21, 21 '.
Wenn eine schmalere Leiterplatte 13' auf dem Transportband 14 zugeführt wird, müssen die Haltearme 17 auf die entsprechend geringere Breite 17' verstellt werden, welche in Fig. 2 mit strichpunktierten Linien angedeutet ist. Dies geschieht wieder mit Hilfe der Gewindelspindel 19 in der vorstehend beschriebenen Weise. In gleicher Weise können automatisch die Haltearme der Plattenhalter auf die jeweils herangeführten Leiterplatten eingestellt werden.If a narrower printed circuit board 13 'is fed on the conveyor belt 14, the holding arms 17 must be adjusted to the correspondingly smaller width 17', which is indicated in FIG. 2 with dash-dotted lines. This is done again with the help of the threaded spindle 19 in the manner described above. In the same way, the holding arms of the plate holder can be automatically adjusted to the PCBs that are brought up.
Bei einem vertikal angeordneten Trockner arbeitet die Vorrichtung gemäß der Erfindung analog der vorstehenden Beschreibung. In a vertically arranged dryer, the device according to the invention works analogously to the description above.

Claims

Patentansprüche Claims
1. Verfahren zum Transportieren von Leiterplatten durch Trocknungsanlagen, bei denen die Leiterplatten nur an zwei gegenüberliegenden Rändern gehalten werden, dadurch gekennzeichnet, daß die Haltearme der Plattenhalter vor dem Eintreten der Leiterplatten in die Trocknungsanlage auf die jeweilige Breite der Leiterplatten selbsttätig eingestellt werden. 1. A method for transporting circuit boards through drying systems in which the circuit boards are held only at two opposite edges, characterized in that the holding arms of the plate holder are automatically adjusted to the respective width of the circuit boards before the circuit boards enter the drying system.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Leiterplattenbreite automatisch abgefragt wird und das Ergebnis der Abfragung die Einstellung der Haltearme der Plattenhalter steuert.2. The method according to claim 1, characterized in that the circuit board width is automatically queried and the result of the query controls the setting of the holding arms of the plate holder.
3. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Haltearme (17) der Plattenhalter (11) mittels Gewindespindeln (18, 18') verstellbar sind.3. Device for performing the method according to claim 1 and 2, characterized in that the holding arms (17) of the plate holder (11) by means of threaded spindles (18, 18 ') are adjustable.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Gewindespindel (19) mit Rechts- und Linksgewinde (18, 18') versehen ist und beide Haltearme (17) gleichzeitig verstellt.4. The device according to claim 3, characterized in that the threaded spindle (19) with right and left hand threads (18, 18 ') is provided and both holding arms (17) adjusted simultaneously.
5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet , daß die Gewinde spindel ( 1 9) nur mit Rechts- oder Linksgewinde versehen ist und nur einen Haltearm (17) verstellt.5. The device according to claim 1, characterized in that the threaded spindle (1 9) is provided only with right-hand or left-hand thread and only adjusts one holding arm (17).
6. Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß die Haltearme (17) mittels Buchsen (18) auf der Gewindespindel (19) geführt und durch eine Längsführung (22) gegen Verdrehung gesichert sind.6. Device according to one of claims 3 to 5, characterized in that the holding arms (17) by means of bushings (18) on the threaded spindle (19) and are secured by a longitudinal guide (22) against rotation.
7. Vorrichtung nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, daß die Gewindespindel (19) beiderseits in den Winkellaschen (10) der Transportkette (6) gelagert ist.7. Device according to one of claims 3 to 6, characterized in that the threaded spindle (19) is mounted on both sides in the angle plates (10) of the transport chain (6).
8. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß anstelle der Gewindespindein eine Verstellung der Haltearme (17) durch Druckmittelbetätigung vorgesehen ist 8. The device according to claim 3, characterized in that instead of the threaded spindle an adjustment of the holding arms (17) is provided by pressure medium actuation
9. Vorrichtung nach einem der Ansprüche 3 bis 8, dadurch gekennzeichnet, daß die Haltearme (17) des Plattenhalters (11) nach dem Entleeren der Leiterplatten (13) automatisch in ihre Grundstellung zurückgeführt werden.9. Device according to one of claims 3 to 8, characterized in that the holding arms (17) of the plate holder (11) after the emptying of the circuit boards (13) are automatically returned to their basic position.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Verstellung der Haltearme (17) im Umlenkungsbereich der Transportvorrichtung vor der Aufnahme der Leiterplatten (13) erfolgt.10. Device according to one of claims 1 to 9, characterized in that the adjustment of the holding arms (17) in the deflection region of the transport device is carried out before receiving the printed circuit boards (13).
11. Vorrichtung nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, daß die Breite der Leiterplatten (13) mit Hilfe von Sensoren (16) ermittelt wird, welche die Leiterplatten (13) berührungslos abtasten, wie z. B. Photozellen. 11. Device according to one of claims 2 to 7, characterized in that the width of the circuit boards (13) is determined with the aid of sensors (16) which scan the circuit boards (13) without contact, such as. B. photocells.
PCT/DE1986/000457 1985-11-11 1986-11-11 Process and device for transporting printed circuit boards through drying installations WO1987003076A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853539959 DE3539959A1 (en) 1985-11-11 1985-11-11 METHOD FOR TRANSPORTING PCBS THROUGH DRYING SYSTEMS AND DEVICE FOR CARRYING OUT THIS METHOD
DEP3539959.7 1985-11-11

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DE (1) DE3539959A1 (en)
WO (1) WO1987003076A1 (en)

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DE3539959A1 (en) 1987-05-21
DE3539959C2 (en) 1987-10-29

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