| 摘要 |
559,304. Coating with metals. HUNT, Ltd., A. H., and WHITLEY, C. July 3, 1942, No. 9247. [Class 82 (ii)] In the manufacture of metalized dielectric elements for electrical condensers in which the metalized surface is of smaller area than the d'electric elements, an embossing foil of a width at least equal to the one of the dimensions of the area is applied to a dielectric sheet placed in a press and the foil is pressed on to the sheet by a heated stamping face of such dimensions as to limit the pressure to that area, the foil comprising the backing and the portions of metal foil not adhering to the sheet being torn off. The dielectric sheet may then be cut to the required size. Travelling over a feed table 15 and the lower plate 16 of a press supported on legs 17 is a conveyer 11 provided with holes in its edges which are engaged by pins 13 in drums 12. A strip 18 of embossing foil 18 passes from a supply roller 19 under guide rollers 20, 21 between feed nip rollers 22 to a take-up-spool 23. The press has a plunger 24 carrying a die block 25 in which is an electric heating coil 26, the lower face of the block 25 being of the same dimensions as that of the metal film to be applied to the dielectric sheets. The band 11 is provided with a series of apertures 27 each taking a sheet 28. The drums 12 and the rollers 22 are moved intermittently in unison and each forward movement brings one opening 27 into register with the lower face of the block 25 and when the conveyer comes to rest the plunger 24 is brought down pressing the block 25 into the foil 18 and bringing into contact with the sheet 28 in position. The heat in the block causes the metal in the foil to adhere to the sheet 28 and when the plunger is raised the paper comes away from the sheet leaving the metal cooling in situ on the sheet. On the next move forward of the conveyer the metallized sheet 28 drops on to the support 29 and a fresh sheet 28 is moved into position under the plunger 24. In another form the metal is applied, preferably on both sides by two plungers, to continuous lengths of dielectric material and then the coated sheets are cut out by a separate punch which only operates when the length of material is at rest. In a third form, the metal is applied to continuous lengths by heated rollers which are provided with projecting sections which impress metal in the length of material which then passes between two rotary knives which make transverse cuts across the length in the spaces between the metallized areas, leaving uncut edge bands which are cut off by two further rotary knives so completing the cutting of sheets from the continuous length of material. Specificatdon 503,851 is referred to. |
