current in the fractions of copper laminae which remain pressed in the press during cyclic closing stages application_number US 55368195 A description the manufacturing system 10 comprises a cold press 11 and unit 50 for feeding in copper laminae and bands of prepreg the press 11 comprises the fixed plates at the base 20 and at the top 21 connected by columns 24 and the upper mobile plate 23 moving up and down said columns metal slabs 25 and 26 and the sheet of insulating material 27 are placed on the bottom plate 20 metal slabs 28 and 29 and the sheet of insulating material 30 are applied to the mobile plate 23 an electric contact strip 40 with terminal 41 is fixed to one side of the lower insulating sheet 27 an electric contact strip 42 with terminal 43 is fixed to one side of the upper insulating sheet 30 said terminals 41 and 43 are connected by cables 44 and 45 to a source 46 of electric current the feed unit 50 comprises a series of feeders like 51 52 53 the feeder 51 has two reels 60 61 respectively for the copper lamina 62 guided by the roller 69 and for the copper lamina 63 and reels 70 71 72 of bands 73 74 75 of prepreg interposed between the previous two reels said copper laminae.