Abstract:
Process for producing plastic laminates with metal laminae especially for printed circuits, by formation of one or more packages (51-54) arranged in piles, obtained from a multicomponent band (45) continuously fed in and, simultaneously, both from bands (30-32) of supporting material impregnated with plastic material and from one or two copper bands (33, 34)
Abstract:
Continuous process for manufacturing, in a cold press (11), plastic laminates with copper laminae and intermediate layers of prepreg, by multicomposition bands (78, 98, 118) with copper laminae (62, 63, 82, 83, 102, 103) and bands (73-75, 93-95, 113-115) of prepreg continuously fed in from reels (60, 61, 70-72) which, placed one upon another, pass through the press (11), endothermic heating being provided by circulating electric current in the fractions of copper laminae (62, 63, 82, 83, 102, 103) which remain pressed in the press (11) during cyclic closing stages.
Abstract:
In manufacturing multilayer plastic laminates for printed circuits, a press with two surfaces exerts pressure under vacuum on a stack of laminates, the packs, alternated with separator plates made of anodized aluminum. The packs include prepreg layers. The metalizations present on the two sides of each pack are portions of a copper strip repeatedly folded 180° around each pack and each separator plate. A strong current circulates in the copper strip which heats the strip with resistive behavior: the heat causes the close fixing of the various layers. An auxiliary heater is applied to each surface of the press by means of an interposed insulating plate. This comprises an aluminum plate with equidistant longitudinal holes containing the same number of armored candle-like resistors, connected in parallel. A main power supply provides direct current to the copper strip, two secondary power supplies provide alternating current to the two auxiliary heaters. A PLC is connected to three thermal probes, respectively present at the center of the stack and in the two auxiliary heaters. The PLC assisted by a PC controls the three power supplies in order to increase the measured temperatures according to a pre-established gradualness, consequently obtaining about the same temperature in all the packs of the stack.
Abstract:
Panel for electric heating formed of an outer hermetic aluminium shell comprising an inner shell with a rectangular base and a cover, inside which is an ohmic resistance in the shape of a planar serpentine, formed of a series of U-bends and having two pseudo-circular endings that extend to the inside of a hermetic contact module integrated with the outer shell. The serpentine is made of a rigid bar of stainless AISI 304 steel having a rectangular section, constant width and thickness, and a width-to-thickness ratio of less than 3. Two sheets of mica in contact with the inner shell and with the cover, one on each face of the serpentine, insulate it from the outer shell and minimize the free internal spaces. The base of the inner shell incorporates a thick layer of oxide, black in colour, formed by hard anodizing, favouring infrared irradiation. An internal thermal insulator hinders the flow of heat towards the cover. The contact model includes two brass columns with widened circular bases, connected by screws in the base to the feed wiring and to the endings of the serpentine. A probe measures the temperature in contact with the serpentine.
Abstract:
Process for producing plastic laminates with copper laminae for electronic circuits, including multilayer, with pressing in a cold press (10) and endothermic heating of a pile (88) of packages of the components obtained by generating voltage in the copper laminae by induction created by a ferromagnetic core (50) with a winding (60) through which the alternating current passes.
Abstract:
Automatic machine (110) for assembly of piles (45) of packages for plastic laminates comprising a feed unit with two carriages (60, 80) each carrying two reels of bands respectively of copper (20, 22) and of insulating material (21, 23), and a hoisting unit (120) for the work table, the pile (45) being formed by causing the carriages (60, 80) to move back and forth cross the work table, the bands (12-15) being held in position by special devices (181, 182) before each stroke made by the carriages (60, 80), there being placed after each bend at 180 DEG of the bands (12-15), alternatingly, an intermediate sheet (30) and a set of sheets (35, 36) of prepreg.
Abstract:
A description is given of a machine for making semi-finished products of a printed circuit type of multi-layer comprising two supporting templates (14, 25) and two piles of layers for processing, situated between a station for piling layers (A) or for unloading the semi-finished product (B) and a station where the layers are bonded by electromagnetic induction (D). The two templates are aligned along a common axis of translation and alternate between the piling station and the bonding station, and vice versa. Before exchanging positions between the two stations, the templates are turned over outwards to avoid reciprocal mechanical hindrance A mobile robot, aligned along the common axis of translation, draws up by suction each new layer from a pile of layers placed in the reverse order and aligned by means of a set of video cameras and linear motors for rotation-translation of the layer The robot then moves on to the piling station.
Abstract:
Process for the production of plastic laminates especially those for printed circuits, the component parts being assembled in packages (11-14) arranged in piles (10), in which process the laminae on the two faces of each laminate are respectively made from two continuous bands (20, 30), laid serpentinewise which, alternatingly, form the upper and lower laminae of each package (11-14) as it is formed, heating of said packages (11-14) being made endothermically by means of electric heating elements created by connecting the ends of the two bands to a suitably powered generator (50) of electric current.
Abstract:
Process for the production of plastic laminates for printed circuits with the components assembled in packages (11-13) arranged in piles (10) in a cold press (100) heating being done endothermically and obtained by electric heating elements connected in series to a generator (29) of electricity, copper laminae (20-25) being placed at the beginning and end of each package (11-13), or else sheets (30-33) of steel or other material being placed between one package and another and at the beginning and end of the pile (10).
Abstract:
An induction welding head for welding multilayer printed circuits (PCB) comprises a ferrite induction device with polar U-shaped expansions in sliding contact against two movable induction electrodes of elongated form. The induction electrodes are aligned along the same translation axis and are controlled by pneumatic actuators in order to be positioned against the multilayer exerting a pressure on the contact surface. Each opposed ends of the induction electrodes has a thermal barrier constituted by a small Teflon™ plate with a 70-microns copper layer sticked at one face, and the other face glued by a bi-adhesive tape to the polar face of the induction electrode. The copper layer extends for a part of the end surface of the induction electrode. A ribbon thermocouple is brought in contact with the copper layer of the thermal barrier maintained against it by a small Teflon lid. The thermocouple sends a measurement signal of the temperature reached by the thermal barrier to a controller device of the power circuit feeding the induction winding with 500 V square-wave at 24 kHz (fig. 3).