WO1982003523A1 - Improvements to machines for drying printed circuit cards wired after cleaning them at the end of an automatic welding operation of the components - Google Patents

Improvements to machines for drying printed circuit cards wired after cleaning them at the end of an automatic welding operation of the components Download PDF

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Publication number
WO1982003523A1
WO1982003523A1 PCT/FR1982/000061 FR8200061W WO8203523A1 WO 1982003523 A1 WO1982003523 A1 WO 1982003523A1 FR 8200061 W FR8200061 W FR 8200061W WO 8203523 A1 WO8203523 A1 WO 8203523A1
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WO
WIPO (PCT)
Prior art keywords
tunnel
air
cards
drying
printed circuit
Prior art date
Application number
PCT/FR1982/000061
Other languages
French (fr)
Inventor
Sagem
Original Assignee
Sauvan Gerard
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Filing date
Publication date
Application filed by Sauvan Gerard filed Critical Sauvan Gerard
Publication of WO1982003523A1 publication Critical patent/WO1982003523A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
    • 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

Definitions

  • the present invention relates to improvements made to machines for drying wired printed circuit boards after cleaning them after an automatic welding operation of the components, comprising: a tunnel in which the boards can be moved dry, this tunnel having an inlet for wet cards and an outlet for dried cards; means for circulating, in the tunnel, drying air in the opposite direction to the direction of movement of the cards, that is to say from substantially the exit from the tunnel to substantially the entrance to the tunnel; and regulating means for increasing the temperature of the drying air between its injection into the tunnel and its extraction from the tunnel. Drying machines designed for this specific function are already known, which have many drawbacks by limiting use.
  • the volume of air used for drying is very large, of the order of 10,000 m 3 per hour.
  • the production facilities for wired printed circuit boards and in particular drying machines
  • the large volume of air displaced in these rooms by the drying machines is completely incompatible with correct operation of the air conditioning: this air conditioning is therefore constantly disturbed, which consequently adversely affects the operation of the various machines of the printed circuit board processing installation.
  • the object of the invention is essentially to remedy, as far as possible, the drawbacks of the drying machines used at present and to provide an improved drying machine which better meets the various requirements of the technique, in particular thanks to a machine arranged in such a way that its operation in an air-conditioned room does not disturb the air conditioning and whose operating cost as well as the manufacturing cost are as low as possible.
  • the drying machine according to the invention is characterized in that the regulation means include:
  • drying air heating means distributed along the tunnel and arranged to bring the drying air to increasing successive temperatures, the relative humidity of the drying air remaining between two predetermined values ;
  • the temperature of the air, at its injection into the tunnel is between ambient temperature and 50 ° C.
  • the temperature of the air, at its extraction from the tunnel is lower than 90 ° C., preferably of around 80 ° C, and the relative humidity of the air in the tunnel remains between about 40% and 60%.
  • the relative humidity of the drying air therefore presents, throughout the tunnel, variations of small value (of the order of 20%), sufficient to provide effective drying.
  • blowing means are provided for blowing air on the cards in the direction opposite to their direction of movement, which is eliminated. a large part of the cleaning liquid flowing on said cards. It follows that the cards thus previously cleared of the game dripping cleaning liquid ("spin" phase) are simply wet when they approach the actual drying part of the machine, which allows increased energy savings.
  • the machine of the invention further comprises heat exchanger means between the hot and humid air extracted from the tunnel in the vicinity of the entrance thereof and the fresh air introduced into the tunnel in the vicinity of the exit from it. This results in a condensation of the water vapor contained in the hot air coming from the tunnel before the air is released to the outside.
  • the water thus recovered can be returned to the final rinsing tank of the card washing zone in the cleaning machine associated with the drying machine of the invention and located upstream thereof. This saves cleaning water and avoids the problems posed by the condensation of water in chimneys.
  • the fresh air absorbed by the installation with a flow rate equal to that of the exhaust air is preheated in the exchanger: its relative humidity is lowered and the overall efficiency is increased.
  • the drying machine of the invention is satisfied with a very low flow rate of fresh air, for example of the order of 500 m 3 per hour in the case previously considered, which is compatible with efficient air conditioning of the local.
  • FIG. 1 is a schematic perspective view of a drying machine arranged in accordance with the invention.
  • FIG. 2 is a graph illustrating the operating mode of the drying machine of Figure 1.
  • the drying machine for wired printed circuit boards, shown in Figure 1 comprises a tunnel 1, which can be rectilinear as shown or marry any curved contour appropriate to the needs, inside which a transporter 2 extends from the entrance 3 of the tunnel, through which the wet cards 4 penetrate, to the exit 5 of the tunnel at which appear dried cards.
  • the conveyor 2 can be specific to the tunnel and be connected to processing stations located downstream and upstream by other means for moving the cards 4, in particular by other carriers.
  • the conveyor 2 can also be the same as that which moved the cards within and from the cleaning machine (not shown) located upstream of the drying machine.
  • a turbine 6 Downstream of the inlet 3 is a turbine 6 which propels air onto the cards 4 via a nozzle 7 of vertical shape and inclined towards the inlet 3 of the tunnel, so that, under the action of the jet of air propelled against the flow of the cards 4, the cleaning liquid dripping on the faces of the cards is discharged in the direction of the inlet 3 ("spin" operation).
  • the tunnel 1 Downstream of the blowing nozzle 7, the tunnel 1 is provided with partitions 8 separating its internal volume into a succession of chambers 9.
  • These partitions are arranged to be easily passable by the cards 3 driven by the transporter 2, but to constitute barriers to air flow; they can advantageously be formed by two half-barriers constituted by elastically deformable strips (for example made of rubber). Only three of these partitions are visible in Figure 1.
  • each partition 8 means are provided for authorizing the passage of air from one room to the adjoining room: for this purpose, two openings 10 are made in the side wall of the tunnel, on either side another of partition 8, and therefore opening into two adjoining rooms.
  • a housing 11 covers the two openings 10 and contains air heating means (for example a thermostatically controlled electrical resistance 12) intended to heat the air passing from one room to the next through the openings 10 and the interior volume of the housing 11.
  • air heating means for example a thermostatically controlled electrical resistance 12
  • each housing 11 there is provided a fan (not visible in the figures) ensuring local displacement of the drying air. Each fan takes the air in the tunnel 1 through one of the openings 10 and returns it in this tunnel through the other opening 10 after having brought it into contact with the heating means.
  • the tunnel 2 is provided with an air inlet mouth 13 which opens in the last chamber 9, in the vicinity of the outlet 5 of the tunnel and an air outlet mouth 14 which s opens in the first chamber 9 located just after the inlet '3 of the tunnel and downstream of the blowing nozzle 7 (these different relative positions being indicated by considering the direction of circulation of the cards 3, symbolized by the arrow 15).
  • the air outlet mouth 14 is connected to a plate heat exchanger 16, provided, at its lower part with a tank 17 for collecting condensation water which is connected, by conduits 18, to a point evacuation of these waters; for example, these conduits can transfer the condensation water (of "distilled water” quality) to the card cleaning machine located upstream, in certain types of installation which will be indicated later.
  • the exchanger 16 also includes an evacuation 19 of the hot air which is sucked in by a turbine 20 and discharged at 21 to the outside after having given up its calories.
  • the exchanger 16 is also provided with an intake 22 of fresh air (ambient air) which is connected to the inlet mouth 13 and set in motion by a turbine 23.
  • fresh air ambient air
  • the air temperature in degrees Celsius is plotted on the ordinate and the mass of water vapor per unit weight of drying air in g / kg of air is plotted on the abscissa.
  • the inclined straight lines 25 are the isotherms and the curves 26 are the curves with constant relative humidity of the air.
  • the fresh air at room temperature (of the order of 20 ° C. for example) and at a normal relative humidity of the order of 60% - segment 27, in FIG. 2 - is drawn into the exchanger 16 through the mouth 22 and heats up in contact with the heat exchange plates, heated by the hot air coming from the extraction mouth 14.
  • the temperature of the fresh air can reach 40 ° C to 50 ° C (segment 28 in FIG. 2), its humidity level then being reduced to approximately 205. ie approximately 8.6 g of water vapor per kilogram of air.
  • This dry and lukewarm air is then sent, via the inlet mouth 13, to the last chamber 9 of the tunnel 1, in which the cards 4 already arrive practically dry.
  • the air is enriched with vapor water (segment 29 in Figure 2) until it rushes into the last housing 11; it then contains approximately 28.6 g of water vapor per kilogram of air and its relative humidity is approximately 60%.
  • the air in contact with the electrical resistance, the air is heated and its temperature goes from 40 ° C to about 48 ° C, its water vapor content remaining constant and its degree of relative humidity then being reduced to approximately 40% (segment 30 in FIG. 2).
  • the air then exits from the last box 11 and then scans the penultimate chamber 9 in which the cards 4 are still wet. At its constant temperature of 48 ° C, the air licks the cards by taking hold of part of their humidity.
  • the water vapor content of the air then increases to around 44 g / kg of air and its relative humidity level increases to h. 60 fo (segment 31 in Figure 2), when it rushes into the penultimate housing 11; there, it is heated, its temperature going from 48 ° C to about 56 ° C, and its relative humidity is reduced to 40 f> (segment 32 in Figure 2). Then it enters the previous chamber 9 and the cycle continues, the air being heated and enriched in water vapor in stages, while maintaining a relative humidity level between 40.% and 60%. Finally, on leaving the first housing 11, the air heated to 80 ° C.
  • the hot and humid air is then led to the plate exchanger where it transfers part of its heat to the fresh air sucked in through the mouth 22. Due to this cooling, the water vapor condenses and the water is collected in the tank 17. The air is then discharged outside by the turbine 20.
  • the drying of the cards 4 in the tunnel 1 is therefore carried out by displacing a current of hot air in the opposite direction the circulation of the cards, so that the wet cards are licked by very hot and very humid air, while the practically dry cards are licked by the relatively not very hot, but relatively dry air.
  • the air is never brought to very high temperatures (its temperature remains at most equal to 80 ° C), which avoids excessive consumption of electrical energy for its heating.
  • the presence of the dividing partitions 8 avoids aerolic shunts and makes it possible to design the tunnel in a particularly collected form, without loss of efficiency.
  • the drying machine according to the invention finds a particularly advantageous application in installations for the production of wired printed circuit boards known as "online installations". It can in particular be incorporated into modern high speed processing installations. cards (of the order of 3 m / min) in which the soldering of the electrical components on the. cards are made with a water-soluble flux solder: it is then possible to recover the condensation water (of "distilled” quality) in the tank 17 of the heat exchanger and to send it back to the washing of the card cleaning machine located downstream.
  • the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all its variants.

Abstract

A machine for drying printed circuit cards wired after cleaning them at the end of an automatic welding operation of the components comprises a tunnel (1) wherein the cards to be dried may be moved, this tunnel having an inlet (3) for wet cards and an outlet (5) for dried cards, separation means (8) dividing the tunnel in successive chambers, means (23) to circulate in the tunnel drying air in a direction opposite to the moving direction of the cards, regulation means (12) to increase the temperature of drying air between the injection and extraction thereof so that the relative humidity degree of drying air remains between two predetermined values, and pneumatic connection means between the chambers and said regulation means.

Description

Perfectionnements apportés aux machines pour sécher des cartes à circuits imprimés câblées après nettoyage de celles-ci à l'issue d'une opération de soudage automatique des composants Improvements made to machines for drying wired printed circuit boards after cleaning them after an automatic welding operation of the components
La présente invention concerne des perfectionnements apportés aux machines servant à sécher des cartes à circuits imprimés câblées après nettoyage de celles-ci à l'issue d'une opération de soudage automatique des composants, comprenant : un tunnel dans lequel peuvent être déplacées les cartes à sécher, ce tunnel possédant une entrée pour les cartes mouillées et une sortie pour les cartes séchées ; des moyens pour faire circuler, dans le tunnel, de l'air de séchage en sens inverse du sens de déplacernent des cartes, c'est-à-dire depuis sensiblement la sortie du tunnel jusqu'à sensiblement l'entrée du tunnel ; et des moyens de régulation pour faire croître la température de l'air de séchage entre son injection dans le tunnel et son extraction hors du tunnel. On connaît déjà des machines de séchage conçues pour cette fonction spécifique, qui présentent de nombreux inconvénients en limitant l'utilisation.The present invention relates to improvements made to machines for drying wired printed circuit boards after cleaning them after an automatic welding operation of the components, comprising: a tunnel in which the boards can be moved dry, this tunnel having an inlet for wet cards and an outlet for dried cards; means for circulating, in the tunnel, drying air in the opposite direction to the direction of movement of the cards, that is to say from substantially the exit from the tunnel to substantially the entrance to the tunnel; and regulating means for increasing the temperature of the drying air between its injection into the tunnel and its extraction from the tunnel. Drying machines designed for this specific function are already known, which have many drawbacks by limiting use.
Dans les machines connues, le volume d'air utilisé pour le séchage est très important, de l'ordre de 10.000 m3 par heure. Or, pour des considérations de fiabilité de fonctionnement, les installations de production des cartes à circuits imprimés câblées (et notamment les machines de séchage) sont la plupart du temps situées dans des locaux climatisés. Or, le grand volume d'air déplacé dans ces locaux par les machines de séchage est tout à fait incompatible avec un fonctionnement correct de la climatisation : cette climatisation est donc constamment perturbée, ce qui par voie de conséquence influe défavorablement sur le fonctionnement des diverses machines de l'installation de traitement des cartes à circuits imprimés.In known machines, the volume of air used for drying is very large, of the order of 10,000 m 3 per hour. However, for considerations of operational reliability, the production facilities for wired printed circuit boards (and in particular drying machines) are most of the time located in air-conditioned premises. However, the large volume of air displaced in these rooms by the drying machines is completely incompatible with correct operation of the air conditioning: this air conditioning is therefore constantly disturbed, which consequently adversely affects the operation of the various machines of the printed circuit board processing installation.
Par ailleurs, la conception technique de ces machines connues est telle que de grandes quantités de vapeur d'eau sont dégagées dans les locaux, ce qui ajoute encore au fonctionnement incorrect de la climatisation.Furthermore, the technical design of these known machines is such that large quantities of water vapor are released into the premises, which further adds to the air conditioning malfunction.
Enfin, ces machines de séchage connues, de par leur conception, sont grandes gaspilleuses d'énergie, ce qui se répercute défavorablement sur le coût de fabrication unitaire des cartes câblées.Finally, these known drying machines, by their design, are very wasteful of energy, which has a negative impact on the unit manufacturing cost of wired cards.
L'invention a essentiellement pour objet de remédier, dans toute la mesure du possible, aux inconvénients des machines de séchage utilisées à l'heure actuelle et de proposer une machine de séchage perfectionnée qui satisfasse mieux aux diverses exigences de la technique, notamment grâce à une machine agencée de manière telle que son fonctionnement dans un local climatisé ne perturbe pas la climatisation et dont le coût de fonctionnement aussi bien que le coût de fabrication soient aussi faibles que possible. A ces fins, la machine de séchage conforme à l'invention se caractérise en ce que les moyens de régulation comprennent :The object of the invention is essentially to remedy, as far as possible, the drawbacks of the drying machines used at present and to provide an improved drying machine which better meets the various requirements of the technique, in particular thanks to a machine arranged in such a way that its operation in an air-conditioned room does not disturb the air conditioning and whose operating cost as well as the manufacturing cost are as low as possible. For these purposes, the drying machine according to the invention is characterized in that the regulation means include:
- des moyens de séparation répartis dans le tunnel pour diviser celui-ci en chambres successives, lesdits moyens de séparation étant agencés pour pouvoir être franchis par les cartes en déplacement ;- Separation means distributed in the tunnel to divide it into successive chambers, said separation means being arranged to be able to be crossed by the moving cards;
- des moyens de chauffage de l'air de séchage, répartis le long du tunnel et agencés pour porter l'air de séchage à des températures successives croissantes, le degré d'humidité relative de l'air de séchage restant compris entre deux valeurs prédéterminées ;- drying air heating means, distributed along the tunnel and arranged to bring the drying air to increasing successive temperatures, the relative humidity of the drying air remaining between two predetermined values ;
- et des moyens de liaison pneumatiques entre les susdites chambres et les moyens de chauffage tels que, lors de son passage d'une chambre à la suivante, l'air de séchage soit amené à traverser un des moyens de chauffage. Un tel agencement évite les shunts aéroliques et maintient le séchage dans des conditions optimales tout au long du tunnel, ce qui procure une économie d'énergie extrêmement importante. En outre, les cartes mouillées commencent par être léchées par l'air le plus chaud, mais aussi le plus chargé en humidité, vers l'entrée des cartes dans le tunnel, ce qui permet d'en évacuer la plus grande quantité de liquide à moindres frais puisque cet air a déjà été utilisé en aval pour sécher les cartes précédentes.- And pneumatic connection means between the aforementioned chambers and the heating means such that, during its passage from one chamber to the next, the drying air is caused to pass through one of the heating means. Such an arrangement avoids aerolic shunts and maintains drying in optimal conditions throughout the tunnel, which provides an extremely significant energy saving. In addition, the wet cards start by being licked by the warmest air, but also the most moisture-laden, towards the entry of the cards in the tunnel, which allows to evacuate the greatest quantity of liquid at lower cost since this air has already been used downstream to dry the previous cards.
Par contre, vers la sortie des cartes hors du tunnel, les cartes sont pratiquement sèches et on achève l'élimination des dernières traces d'humidité en les baignant avec un air relativement sec (degré d'humidité relative de l'air ambiant), mais qui peut ne pas être très chaud (air tiède). Il s'agit là d'une utilisation particulièrement économique de l'air de séchage, dont la température et le degré d'humidité relative, en tout endroit du -tunnel, procurent une efficacité maximale pour l' évaporation de l'humidité portée par les cartes ; il en résulte une consommation d'énergie qui peut être rendue particulièrement fai- ble, d'autant plus que, tout au long du trajet suivi par l'air au sein du tunnel, son degré d'humidité relative est maintenu entre deux limites prédéterminées au voisinage du degré d'humidité relative normal de l'air ambiant, la teneur en vapeur d'eau augmentant dans des proportions considérables (dans un cas typique, elle est multipliée par environ 14,6).On the other hand, towards the exit of the cards outside the tunnel, the cards are practically dry and the elimination of the last traces of humidity is completed by bathing them with relatively dry air (relative humidity of the ambient air), but which may not be very hot (warm air). This is a particularly economical use of the drying air, the temperature and relative humidity of which, anywhere in the tunnel, provide maximum efficiency for the evaporation of the humidity carried by the cards ; this results in an energy consumption which can be made particularly low, especially since, throughout the path followed by the air within the tunnel, its relative humidity level is maintained between two predetermined limits in the vicinity of the normal relative humidity of the ambient air, the water vapor content increasing considerably (in a typical case, it is multiplied by approximately 14.6).
Avantageusement, la température de l'air, à son injection dans le tunnel, est comprise entre la température ambiante et 50°C, la température de l'air, à son extraction du tunnel, est inférieure à 90°C, de préférence de l'ordre de 80°C, et le degré d'humidité relative de l'air dans le tunnel reste compris entre environ 40 % et 60 %.Advantageously, the temperature of the air, at its injection into the tunnel, is between ambient temperature and 50 ° C., the temperature of the air, at its extraction from the tunnel, is lower than 90 ° C., preferably of around 80 ° C, and the relative humidity of the air in the tunnel remains between about 40% and 60%.
Le degré d'humidité relative de l'air de séchage présente donc, tout au long du tunnel, des variations de faible valeur (de l'ordre de 20 %), suffisantes pour procurer un séchage efficace.The relative humidity of the drying air therefore presents, throughout the tunnel, variations of small value (of the order of 20%), sufficient to provide effective drying.
Pour accroître encore l'efficacité de la machine, au voisinage de l'entrée du tunnel il est prévu des moyens de soufflage pour souffler de l'air sur les cartes en sens contraire à leur sens de déplacement, ce grâce à quoi se trouve éliminée une grande partie du liquide de nettoyage ruisselant sur lesdites cartes. Il en résulte que les cartes ainsi préalablement débarrassées de la partie ruisselante du liquide de nettoyage (phase d' "essorage") sont simplement humides lorsqu'elles abordent la partie de séchage proprement dite de la machine, ce qui permet une économie accrue d'énergie. De préférence, la machine de l'invention comprend en outre des moyens échangeurs de chaleur entre l'air chaud et humide extrait du tunnel au voisinage de l'entrée de celui-ci et l'air neuf introduit dans le tunnel au voisinage de la sortie de celui-ci. II en résulte une condensation de la vapeur d'eau contenue dans l'air chaud provenant du tunnel avant rejet de cet air à l'extérieur. L'eau ainsi récupérée, de qualité "distillée", peut être renvoyée dans le bac de rinçage final de la zone de lavage des cartes dans la machine de nettoyage associée à la machine de séchage de l'invention et située en amont de celle-ci. On économise ainsi de l'eau de nettoyage et on évite les problèmes posés par la condensation de l'eau dans les cheminées.To further increase the efficiency of the machine, in the vicinity of the entrance to the tunnel, blowing means are provided for blowing air on the cards in the direction opposite to their direction of movement, which is eliminated. a large part of the cleaning liquid flowing on said cards. It follows that the cards thus previously cleared of the game dripping cleaning liquid ("spin" phase) are simply wet when they approach the actual drying part of the machine, which allows increased energy savings. Preferably, the machine of the invention further comprises heat exchanger means between the hot and humid air extracted from the tunnel in the vicinity of the entrance thereof and the fresh air introduced into the tunnel in the vicinity of the exit from it. This results in a condensation of the water vapor contained in the hot air coming from the tunnel before the air is released to the outside. The water thus recovered, of "distilled" quality, can be returned to the final rinsing tank of the card washing zone in the cleaning machine associated with the drying machine of the invention and located upstream thereof. this. This saves cleaning water and avoids the problems posed by the condensation of water in chimneys.
Par ailleurs, l'air rejeté à l'extérieur ayant perdu sa vapeur d'eau en excès et des calories dans l'echangeur, perturbe moins la climatisation du local.In addition, the air discharged to the outside having lost its excess water vapor and calories in the exchanger, less disturbs the air conditioning of the room.
De plus, l'air neuf absorbé par l'installation avec un débit égal à celui de l'air rejeté est préchauffé dans l'echangeur : son humidité relative s'en trouve abaissée et le rendement global est accru.In addition, the fresh air absorbed by the installation with a flow rate equal to that of the exhaust air is preheated in the exchanger: its relative humidity is lowered and the overall efficiency is increased.
Ainsi, la machine de séchage de l'invention se satisfait d'un débit très faible d'air neuf, par exemple de l'ordre de 500 m3 par heure dans le cas précédemment envisagé, ce qui est compatible avec une climatisation efficace du local.Thus, the drying machine of the invention is satisfied with a very low flow rate of fresh air, for example of the order of 500 m 3 per hour in the case previously considered, which is compatible with efficient air conditioning of the local.
Enfin, il est particulièrement avantageux que dans une telle machine les cartes à circuits imprimés soient disposées verticalement, de manière que le liquide de nettoyage puisse ruisseler par gravité sur les faces des car"tes afin que la plus grande partie du liquide ait disparu lorsque les cartes pénètrent dans le tunnel et abordent la partie d' "essorage" de la machine.Finally, it is particularly advantageous that in such a machine the printed circuit boards are arranged vertically, so that the cleaning liquid can trickle down by gravity onto the faces of the boxes so that most of the liquid has disappeared when the cards enter the tunnel and approach the "spin" part of the machine.
L'invention sera mieux comprise à la lecture de la description qui suit d'un mode de réalisation préféré donné uniquement à titre d'exemple illύstratif ; dans cette description, on se réfère aux dessins annexés sur lesquels:The invention will be better understood on reading the description which follows of a preferred embodiment given solely by way of illustrative example; in this description, reference is made to the appended drawings in which:
- la figure 1 est une vue schématique en perspective d'une machine de séchage agencée conformément à l'invention, etFIG. 1 is a schematic perspective view of a drying machine arranged in accordance with the invention, and
- la figure 2 est un graphique illustrant le mode de fonctionnement de la machine de séchage de la figure 1. la machine de séchage de cartes à circuits imprimés câblées, représentée à la figure 1 , comprend un tunnel 1, qui peut être rectiligne comme représenté ou épouser n'importe quel contour courbe approprié aux besoins, à l'intérieur duquel un transporteur 2 s'étend depuis l'entrée 3 du tunnel, par laquelle pénètrent les cartes 4 mouillées, jusqu'à la sortie 5 du tunnel à laquelle apparaissent les cartes séchées.- Figure 2 is a graph illustrating the operating mode of the drying machine of Figure 1. the drying machine for wired printed circuit boards, shown in Figure 1, comprises a tunnel 1, which can be rectilinear as shown or marry any curved contour appropriate to the needs, inside which a transporter 2 extends from the entrance 3 of the tunnel, through which the wet cards 4 penetrate, to the exit 5 of the tunnel at which appear dried cards.
Le transporteur 2 peut être propre au tunnel et être raccordé à des postes de traitement situés en aval et en amont par d'autres moyens de déplacement des cartes 4, notamment par d'autres transporteurs. Le transporteur 2 peut également être le même que celui qui a déplacé les cartes au sein de et depuis la machine de nettoyage (non représentée) située en amont de la machine de séchage.The conveyor 2 can be specific to the tunnel and be connected to processing stations located downstream and upstream by other means for moving the cards 4, in particular by other carriers. The conveyor 2 can also be the same as that which moved the cards within and from the cleaning machine (not shown) located upstream of the drying machine.
En aval de l'entrée 3 se trouve une turbine 6 qui propulse de l'air sur les cartes 4 par l'intermédiaire d'une buse 7 de forme verticale et inclinée vers l'entrée 3 du tunnel, de telle manière que, sous l'action du jet d'air propulsé à contresens de la circulation des cartes 4, le liquide de nettoyage ruisselant sur les faces des cartes soit refoulé en direction de l'entrée 3 (opération d'"essorage").Downstream of the inlet 3 is a turbine 6 which propels air onto the cards 4 via a nozzle 7 of vertical shape and inclined towards the inlet 3 of the tunnel, so that, under the action of the jet of air propelled against the flow of the cards 4, the cleaning liquid dripping on the faces of the cards is discharged in the direction of the inlet 3 ("spin" operation).
Cette opération d'élimination du liquide de nettoyage ruisselant sur les cartes est facilitée par le fait que le transporteur 2 est agencé pour supporter et déplacer les cartes disposées verticalement : ainsi, la plus grande partie du liquide s'écoule par simple gravité, le soufflage d'air ci-dessus mentionné ne faisant que parfaire l'élimination du liquide, notamment pour l'élimination des poches de liquide qui peuvent se former au voisinage de composants soudés sur la carte et formant retenue.This operation of removing the cleaning liquid flowing on the cards is facilitated by the fact that the conveyor 2 is arranged to support and move the cards arranged vertically: thus, most of the liquid flows by simple gravity, the blowing above mentioned air only perfecting the elimination of the liquid, in particular for the elimination of the pockets of liquid which may form in the vicinity of components soldered on the card and forming retaining.
En aval de la buse de soufflage 7, le tunnel 1 est muni de cloisons 8 séparant son volume intérieur en une succession de chambres 9. Ces cloisons sont agencées pour être facilement franchissables par les cartes 3 entraînées par le transporteur 2, mais pour constituer des barrières à des écoulements d'air ; elles peuvent avantageusement être formées par deux demi-barrières constituées par des lamelles élastiquement déformables (par exemple en caoutchouc). Seules trois de ces cloisons sont visibles sur la figure 1.Downstream of the blowing nozzle 7, the tunnel 1 is provided with partitions 8 separating its internal volume into a succession of chambers 9. These partitions are arranged to be easily passable by the cards 3 driven by the transporter 2, but to constitute barriers to air flow; they can advantageously be formed by two half-barriers constituted by elastically deformable strips (for example made of rubber). Only three of these partitions are visible in Figure 1.
Au droit de chaque cloison 8, il est prévu des moyens pour autoriser le passage de l'air d'une chambre à la chambre voisine : à cet effet, deux ouvertures 10 sont pratiquées dans la paroi latérale du tunnel, de part et d'autre de la cloison 8, et s'ouvrant donc dans deux chambres contiguès. Un boîtier 11 coiffe les deux ouvertures 10 et contient des moyens de chauffage de l'air (par exemple une résistance électrique thermostatée 12) destinés à chauffer l'air passant d'une chambre à la suivante par l'interméâiaire des ouvertures 10 et du volume intérieur au boîtier 11. En outre, dans chaque boîtier 11, il est prévu un ventilateur (non visible sur les figures) assurant un déplacement local de l'air de séchage. Chaque ventilateur prélève l'air dans le tunnel 1 par l'une des ouvertures 10 et le renvoie dans ce tunnel par l'autre ouverture 10 après l'avoir mis en contact avec les moyens de chauffage.At the right of each partition 8, means are provided for authorizing the passage of air from one room to the adjoining room: for this purpose, two openings 10 are made in the side wall of the tunnel, on either side another of partition 8, and therefore opening into two adjoining rooms. A housing 11 covers the two openings 10 and contains air heating means (for example a thermostatically controlled electrical resistance 12) intended to heat the air passing from one room to the next through the openings 10 and the interior volume of the housing 11. In addition, in each housing 11, there is provided a fan (not visible in the figures) ensuring local displacement of the drying air. Each fan takes the air in the tunnel 1 through one of the openings 10 and returns it in this tunnel through the other opening 10 after having brought it into contact with the heating means.
Enfin, le tunnel 2 est muni d'une bouche d'entrée d'air 13 qui s'ouvre dans la dernière chambre 9, au voisinage de la sortie 5 du tunnel et d'une bouche de sortie d'air 14 qui s'ouvre dans la première chambre 9 située juste après l'entrée '3 du tunnel et en aval de la buse de soufflage 7 (ces différentes positions relatives étant indiquées en considérant le sens de circulation des cartes 3, symbolisé par la flèche 15). La bouche de sortie d'air 14 est raccordée à un échangeur thermique à plaques 16, muni, à sa partie inférieure d'un bac 17 de récupération des eaux de condensation qui est raccordé, par des conduits 18, à un point d'évacuation de ces eaux ; par exemple, ces conduits peuvent transférer l'eau de condensation (de qualité "eau distillée") à la machine de nettoyage des cartes située en amont, dans certains types d'installations qui seront indiqués ultérieurement.Finally, the tunnel 2 is provided with an air inlet mouth 13 which opens in the last chamber 9, in the vicinity of the outlet 5 of the tunnel and an air outlet mouth 14 which s opens in the first chamber 9 located just after the inlet '3 of the tunnel and downstream of the blowing nozzle 7 (these different relative positions being indicated by considering the direction of circulation of the cards 3, symbolized by the arrow 15). The air outlet mouth 14 is connected to a plate heat exchanger 16, provided, at its lower part with a tank 17 for collecting condensation water which is connected, by conduits 18, to a point evacuation of these waters; for example, these conduits can transfer the condensation water (of "distilled water" quality) to the card cleaning machine located upstream, in certain types of installation which will be indicated later.
L'echangeur 16 comporte également une évacuation 19 de l'air chaud qui est aspiré par une turbine 20 et rejeté en 21 vers l'extérieur après avoir cédé ses calories.The exchanger 16 also includes an evacuation 19 of the hot air which is sucked in by a turbine 20 and discharged at 21 to the outside after having given up its calories.
L'echangeur 16 est aussi muni d'une admission 22 d'air neuf (air ambiant) qui est raccordée à la bouche d'entrée 13 et mis en mouvement par une turbine 23.The exchanger 16 is also provided with an intake 22 of fresh air (ambient air) which is connected to the inlet mouth 13 and set in motion by a turbine 23.
On va maintenant décrire le fonctionnement de la machine de la figure 1 en se référant au diagramme explicatif de la figure 2, en notant que, sur la figure 1, les flèches à double corps 15 symbolisent le sens de circulation des cartes 4 tandis que les flèches à simple corps (telles que 24) symbolisent le sens de circulation de l'air de séchage.We will now describe the operation of the machine of Figure 1 with reference to the explanatory diagram of Figure 2, noting that in Figure 1, the double body arrows 15 symbolize the direction of movement of the cards 4 while the single-body arrows (such as 24) symbolize the direction of drying air flow.
Sur la figure 2, on a porté en ordonnées la température de l'air en degrés Celsius et en abscisses la masse de vapeur d'eau par unité de poids d'air de séchage en g/kg d'air. Les droites inclinées 25 sont les isothermes et les courbes 26 sont les courbes à degré d'humidité relative constant de l'air.In FIG. 2, the air temperature in degrees Celsius is plotted on the ordinate and the mass of water vapor per unit weight of drying air in g / kg of air is plotted on the abscissa. The inclined straight lines 25 are the isotherms and the curves 26 are the curves with constant relative humidity of the air.
Sur la figure 2, le cycle suivi par l'air de séchage est représenté en trait gras.In Figure 2, the cycle followed by the drying air is shown in bold lines.
L'air neuf à température ambiante (de l'ordre par exemple de 20°C) et à degré d'humidité relative normal de l'ordre de 60%- segment 27, sur la figure 2 - est aspiré dans l'echangeur 16 par la bouche 22 et s'échauffe au contact des plaques d'échange, thermique chauffées par l'air chaud provenant de la bouche d'extraction 14. La température de l'air neuf peut atteindre 40°C à 50°C (segment 28 sur la figure 2), son degré d'humidité étant alors ramené à environ 205. soit environ 8,6 g de vapeur d'eau par kilogramme d'air. Cet air sec et tiède est ensuite envoyé, via la bouche d'entrée 13, dans la dernière chambre 9 du tunnel 1, dans laquelle les cartes 4 parviennent déjà pratiquement sèches. A ce contact, l'air s'enrichit en vapeur d'eau (segment 29 sur la figure 2) jusqu'à ce qu'il s'engouffre dans le dernier boîtier 11 ; il contient alors environ 28,6 g de vapeur d'eau par kilogramme d'air et son degré d'humidité relative est d'environ 60 fo. Dans l'enceinte du boîtier 11, au contact de la résistance électrique, l'air est chauffé et sa température passe de 40°C à environ 48°C, sa teneur en vapeur d'eau restant constante et son degré d'humidité relative étant alors ramené à environ 40 fo (segment 30 sur la figure 2). L'air sort alors du dernier boîtier 11 et balaye ensuite l'avant-dernière chambre 9 dans laquelle les cartes 4 sont encore humides..Sous sa température constante de 48°C, l'air lèche les cartes en s'emparant d'une partie 'de leur humidité. La teneur en vapeur d'eau de l'air augmente alors jusqu'à environ 44 g/kg d'air et son degré d'humidité relative passe h. 60 fo (segment 31 sur la figure 2), au moment où il s'engouffre dans l'avant-dernier boîtier 11 ; là, il est chauffé, sa température passant de 48°C à environ 56°C, et son degré d'humidité relative est ramené à 40 f> (segment 32 sur la figure 2). Puis il pénètre dans la chambre 9 précédente et le cycle se poursuit, l'air étant chauffé et s'enrichissant en vapeur d'eau par paliers, tout en conservant un degré d'humidité relative compris entre 40. % et 60 fo. Finalement, à sa sortie du premier boîtier 11, l'air chauffé à 80°C est chargé de 104,2 g de vapeur d'eau par kilogramme d'air, avec 40 fo d'humidité relative, lèche les cartes 4 mouillées qui viennent de pénétrer dans le tunnel et, au moment où il s'engouffre dans la bouche de sortie 14, il contient 125,5 S de vapeur d'eau par kilogramme d'air avec une humidité relative de 60 %.The fresh air at room temperature (of the order of 20 ° C. for example) and at a normal relative humidity of the order of 60% - segment 27, in FIG. 2 - is drawn into the exchanger 16 through the mouth 22 and heats up in contact with the heat exchange plates, heated by the hot air coming from the extraction mouth 14. The temperature of the fresh air can reach 40 ° C to 50 ° C (segment 28 in FIG. 2), its humidity level then being reduced to approximately 205. ie approximately 8.6 g of water vapor per kilogram of air. This dry and lukewarm air is then sent, via the inlet mouth 13, to the last chamber 9 of the tunnel 1, in which the cards 4 already arrive practically dry. At this contact, the air is enriched with vapor water (segment 29 in Figure 2) until it rushes into the last housing 11; it then contains approximately 28.6 g of water vapor per kilogram of air and its relative humidity is approximately 60%. In the enclosure of the housing 11, in contact with the electrical resistance, the air is heated and its temperature goes from 40 ° C to about 48 ° C, its water vapor content remaining constant and its degree of relative humidity then being reduced to approximately 40% (segment 30 in FIG. 2). The air then exits from the last box 11 and then scans the penultimate chamber 9 in which the cards 4 are still wet. At its constant temperature of 48 ° C, the air licks the cards by taking hold of part of their humidity. The water vapor content of the air then increases to around 44 g / kg of air and its relative humidity level increases to h. 60 fo (segment 31 in Figure 2), when it rushes into the penultimate housing 11; there, it is heated, its temperature going from 48 ° C to about 56 ° C, and its relative humidity is reduced to 40 f> (segment 32 in Figure 2). Then it enters the previous chamber 9 and the cycle continues, the air being heated and enriched in water vapor in stages, while maintaining a relative humidity level between 40.% and 60%. Finally, on leaving the first housing 11, the air heated to 80 ° C. is charged with 104.2 g of water vapor per kilogram of air, with 40% of relative humidity, licks the wet cards 4 which have just entered the tunnel and, when it rushes into the outlet mouth 14, it contains 125.5 S of water vapor per kilogram of air with a relative humidity of 60%.
L'air chaud et humide est ensuite entraîné vers l'echangeur à plaques où il cède une partie de sa chaleur à l'air neuf aspiré par la bouche 22. En raison de ce refroidissement, la vapeur d'eau se condense et l'eau est recueillie dans le bac 17. L'air est alors rejeté à l'extérieur par la turbine 20.The hot and humid air is then led to the plate exchanger where it transfers part of its heat to the fresh air sucked in through the mouth 22. Due to this cooling, the water vapor condenses and the water is collected in the tank 17. The air is then discharged outside by the turbine 20.
Le séchage des cartes 4 dans le tunnel 1 s'effectue donc en déplaçant un courant d'air chaud à contresens de la circulation des cartes, de telle manière que les cartes mouillées soient léchées par l'air très chaud et très humide, tandis que les cartes pratiquement sèches soient léchées par l'air relativement peu chaud, mais relativement sec. Il y a donc accumulation d'humidité au voisinage de l'entrée 3 du tunnel (cartes mouillées et air humide), tandis qu'au voisinage de la sortie 5 du tunnel l'humidité reste sensiblement celle de l'ambiance (air tiède et sec et cartes sèches). L'air n'est jamais porté à des températures très élevées (sa température reste au plus égale à 80°C), ce qui évite des consommations excessives d'énergie électrique pour son chauffage.The drying of the cards 4 in the tunnel 1 is therefore carried out by displacing a current of hot air in the opposite direction the circulation of the cards, so that the wet cards are licked by very hot and very humid air, while the practically dry cards are licked by the relatively not very hot, but relatively dry air. There is therefore an accumulation of humidity in the vicinity of the entrance 3 of the tunnel (wet cards and humid air), while in the vicinity of the exit 5 of the tunnel the humidity remains substantially that of the atmosphere (warm air and dry and dry cards). The air is never brought to very high temperatures (its temperature remains at most equal to 80 ° C), which avoids excessive consumption of electrical energy for its heating.
Ce caractère économique du chauffage est encore accru grâce au réchauffage préliminaire de l'air neuf par prélèvement calorifique sur l'air humide sortant du tunnel, la récupération énergétique pouvant atteindre 55 %.This economic character of the heating is further increased thanks to the preliminary heating of the fresh air by calorific removal from the humid air leaving the tunnel, the energy recovery being able to reach 55%.
En outre, la condensation qui en résulte au sein de l'echangeur est avantageuse, car on évite ainsi qu'elle se produise ultérieurement dans les cheminées d'évacuation, avec tous les inconvénients que cela entraîne.In addition, the resulting condensation within the exchanger is advantageous, since this prevents it from occurring later in the exhaust chimneys, with all the disadvantages that this entails.
De plus, la présence des cloisons séparatrices 8 évite les shunts aéroliques et permet de concevoir le tunnel sous une forme particulièrement ramassée, sans pertes de rendement„In addition, the presence of the dividing partitions 8 avoids aerolic shunts and makes it possible to design the tunnel in a particularly collected form, without loss of efficiency.
On notera en supplément l'adaptation automatique du fonctionnement de l'ensemble à la quantité d'eau à évaporer et donc à la surface des cartes à sécher pénétrant dans la machine par unité de temps. Par ailleurs, le débit d'air neuf égal au débit d'air rejeté peut rester relativement faible, de l'ordre de 500 m par heure, ce qui ne risque pas de perturber le fonctionnement correct de la climatisation du local dans lequel est disposée l'installation. Compte tenu des considérations qui précèdent, on conçoit que le coût de fonctionnement de la machine de l'invention reste beaucoup plus faible que celui des machines actuellement connues. Il en est de même de son coût de fabrication puisqu'elle ne comporte aucun matériel particulièrement onéreux.Note in addition the automatic adaptation of the operation of the assembly to the amount of water to be evaporated and therefore to the surface of the cards to be dried entering the machine per unit of time. Furthermore, the flow of fresh air equal to the flow of exhaust air can remain relatively low, of the order of 500 m per hour, which does not risk disturbing the correct functioning of the air conditioning of the room in which is arranged. the installation. In view of the foregoing considerations, it will be understood that the operating cost of the machine of the invention remains much lower than that of the machines currently known. The same is true of its cost of manufacturing since it does not include any particularly expensive material.
La machine de séchage conforme à l'invention trouve une application particulièrement intéressante dans les installations de production de cartes à circuits imprimés câblées dites "installations en ligne". Elle peut notamment être incorporée dans les installations modernes à grande vitesse de traitement des. cartes (de l'ordre de 3 m/mn) dans lesquelles la soudure des composants électriques sur les. cartes est effectuée avec une soudure à flux soluble dans l'eau : il e st alors possible de récupérer l'eau de condensation (de qualité "distillée") dans le bac 17 de l'echangeur de chaleur et de la renvoyer au poste de lavage de la machine de nettoyage des cartes située en aval. Comme il va de soi et comme il résulte d'ailleurs déjà de ce qui précède, l'invention ne se limite nullement à ceux de ses modes d'application et de réalisation qui ont été plus spécialement envisagés ; elle en embrasse, au contraire, toutes les variantes. The drying machine according to the invention finds a particularly advantageous application in installations for the production of wired printed circuit boards known as "online installations". It can in particular be incorporated into modern high speed processing installations. cards (of the order of 3 m / min) in which the soldering of the electrical components on the. cards are made with a water-soluble flux solder: it is then possible to recover the condensation water (of "distilled" quality) in the tank 17 of the heat exchanger and to send it back to the washing of the card cleaning machine located downstream. As goes without saying and as it already follows from the foregoing, the invention is in no way limited to those of its modes of application and embodiments which have been more especially envisaged; on the contrary, it embraces all its variants.

Claims

REVENDICATIONS 1 - Machine pour sécher des cartes à circuits imprimés câblées après nettoyage de celles-ci à l'issue d'une opération de soudage automatique des composants, comprenant : un tunnel dans lequel peuvent être déplacées les cartes à sécher, ce tunnel possédant une entrée pour les cartes mouillées et une sortie pour les cartes séchées ; des moyens pour faire circuler, dans le tunnel, de l'air de séchage en sens inverse du sens de déplacement des cartes, c'est-à-dire depuis sensiblement la sortie du tunnel jusqu'à sensiblement l'entrée du tunnel ; et des moyens de régulation pour faire croître la température de l'air de séchage entre son injection dans le tunnel et son extraction hors du tunnel ; caractérisée en ce que les moyens de régulation comprennent :CLAIMS 1 - Machine for drying wired printed circuit boards after cleaning them after an automatic welding operation of the components, comprising: a tunnel in which the boards to be dried can be moved, this tunnel having a entry for wet cards and one for dry cards; means for circulating, in the tunnel, drying air in the opposite direction to the direction of movement of the cards, that is to say from substantially the exit from the tunnel to substantially the entrance to the tunnel; and regulating means for increasing the temperature of the drying air between its injection into the tunnel and its extraction out of the tunnel; characterized in that the regulation means include:
- des moyens de séparation répartis dans le tunnel pour diviser celui-ci en chambres successives, lesdits moyens de séparation étant agencés pour pouvoir être franchis par les cartes en déplacement, - des moyens de chauffage de l'air de séchage, répartis le long du tunnel et agencés pour porter l'air de séchage à des températures successives croissantes, le degré d'humidité relative de l'air de séchage restant compris entre deux valeurs prédéterminées, - et des moyens de liaison pneumatiques entre les susdites chambres et les moyens de chauffage tels que, lors de son passage d'une chambre à la suivante, l'air de séchage soit amené à traverser un des moyens de chauffage.- separation means distributed in the tunnel to divide it into successive chambers, said separation means being arranged so that they can be crossed by the moving cards, - means for heating the drying air, distributed along the tunnel and arranged to bring the drying air to increasing successive temperatures, the relative humidity of the drying air remaining between two predetermined values, - and pneumatic connection means between the above-mentioned chambers and the means of heating such that, when passing from one room to the next, the drying air is caused to pass through one of the heating means.
2 - Machine de séchage selon la revendication 1, ca-. racterisée en ce que, au voisinage de l'entrée du tunnel, il est prévu des moyens de soufflage pour souffler de l'air sur les cartes en sens contraire à leur sens de déplacement, ce grâce à quoi se trouve éliminée une grande partie du liquide de nettoyage ruisselant sur lesdites cartes.2 - Drying machine according to claim 1, ca-. blown in that, in the vicinity of the tunnel entrance, there are blowing means for blowing air on the cards in the opposite direction to their direction of movement, which eliminates a large part of the cleaning liquid dripping onto said cards.
3 - Machine de séchage selon la revendication 1 ou 2, caractérisée en ce qu'elle comprend en outre des moyens échangeurs de chaleur entre l'air chaud et humide extrait du tunnel au voisinage de l'entrée de celui-ci et l'air neuf introduit dans le tunnel au voisinage de la sortie de celui-ci.3 - drying machine according to claim 1 or 2, characterized in that it further comprises heat exchanger means between the hot and humid air extracted from the tunnel near its entrance and the fresh air introduced into the tunnel near its exit.
4 - Machine de séchage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la température de l'air, à son injection dans le tunnel, est comprise entre la température ambiante et 50°C, en ce que la température de l'air, à son extraction du tunnel, est inférieure à 90°C, de préférence de l'ordre de 80°C, et en ce que le degré d'humidité relative de l'air dans le tunnel reste compris entre environ 40 fo et 60 %.4 - Drying machine according to any one of claims 1 to 3, characterized in that the temperature of the air, when injected into the tunnel, is between ambient temperature and 50 ° C, in that the temperature air, at its extraction from the tunnel, is less than 90 ° C, preferably of the order of 80 ° C, and in that the relative humidity of the air in the tunnel remains between approximately 40% and 60%.
5 - Machine de séchage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les moyens de régulation comprennent des résistances électriques thermostatées.5 - Drying machine according to any one of claims 1 to 4, characterized in that the regulation means comprise thermostatically controlled electrical resistors.
6 - Machine de séchage selon l'une quelconque des revendications précédentes, caractérisée en ce que les cartes à circuits imprimés sont disposées en position verticale. 6 - Drying machine according to any one of the preceding claims, characterized in that the printed circuit boards are arranged in a vertical position.
PCT/FR1982/000061 1981-04-01 1982-04-01 Improvements to machines for drying printed circuit cards wired after cleaning them at the end of an automatic welding operation of the components WO1982003523A1 (en)

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FR8106569810401 1981-04-01
FR8106569A FR2503524A1 (en) 1981-04-01 1981-04-01 IMPROVEMENTS IN MACHINES FOR DRYING WIRED PRINTED CIRCUIT BOARDS AFTER CLEANING THE SAME FOLLOWING AN AUTOMATIC COMPONENT WELDING OPERATION

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DE (1) DE8209397U1 (en)
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CN112867254A (en) * 2020-12-31 2021-05-28 苏州统硕科技有限公司 Manufacturing method of printed circuit board

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ES2757530T3 (en) 2017-09-28 2020-04-29 Atotech Deutschland Gmbh Method for electrolytically depositing a layer of zinc-nickel alloy on at least one substrate to be treated

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US1567023A (en) * 1920-10-30 1925-12-22 Norton Co Continuous drying kiln and method of drying ware
US3579853A (en) * 1968-12-05 1971-05-25 Joseph J Martino Circuit board drier
DE2750973A1 (en) * 1977-11-15 1979-05-17 Famatex Gmbh Fabrik Fuer Texti Cleaning aerosol laden hot air used for drying textiles - by passing air through heat exchanger to cool down to optimal constant temp. and then passing through filter
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Publication number Priority date Publication date Assignee Title
CN110332765A (en) * 2019-06-29 2019-10-15 汕尾市索思电子封装材料有限公司 A kind of drying means and drying device of electroplated product
CN112867254A (en) * 2020-12-31 2021-05-28 苏州统硕科技有限公司 Manufacturing method of printed circuit board

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FR2503524A1 (en) 1982-10-08
JPH0233797B2 (en) 1990-07-30
JPS58500452A (en) 1983-03-24
JPS58500486A (en) 1983-03-31
FR2503524B1 (en) 1984-10-26
DE8209397U1 (en) 1982-12-16

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