Патент USA US2110011код для вставки
. March 1, 1938. _ w, L, ANKLI 2,110,011 ENAMELING AND VARNISHING V-VIRES, RIBBONS, AND THE LIKE Filed Oct. .24,_ 1934 Patented Mar. 1,1938 aiittii lElilitG it v nuns, ‘Walter inc it so it li, Fiarcelcna, dpaln, assignor tc insnlatus it. ill“, Mug, ?witaerland, a joint-stitch company oi‘ Swltnerlantil Application ilictober 2th will, denial hie. ‘lllilt'i’tt in Germany iictoher til, Mitt 2 Claims. (bi. nay rI'he present invention concerns a process and According to one embodiment, the. roller is a device for enameling and varnishing wires, covered with felt or other absorbent material and rotates slowly above a bath of solution of enamel or insulating material in which it dips deeper at one end than at the other. strips or the like. in the enameling processes known ‘hitherto the 5 wire or strip is allowed to pass along a member to which the solution to be applied is fed by any appropriate means. The ?rst coating of enamel which is thus applied on the wire is dried in an oven, after which the wire receives a fresh coat 10 ing by passing it again over the same member and so forth, until the enameling operation is completed. The ?rst coating of enamel is thus subjected to the drying operation as many times as the wire receives successive coatings. in the i5 enameling processes known hitherto, the ?rst coating of enamel is by far the thinnest and con sequently the most fragile, which according to experiment must be due to the fact that the coat-= ing of enamel which has set is all the thinner 20 as the diameter of the wire is smaller. in other words it has thus been established that in the mass in which the diameter increases, the thick ness of the coating of enamel which has set like wise increases. It results from the foregoing, on Other characteristics and pecularities will be come apparent i'rorn the ensuing description and the drawing. - ' in the latter: , Fig. l is the view of a device for carrying out 10 the enameling process according to the inven tion. Fig. 2 is a plan view of the enamel applying means. , - Fig. 3 is a side view in section-along the lines m--llii oi Fig. 2. ’ The apparatus shown diagrammatically in the drawing essentially comprises a container l for the solution of enamel or insulating material with which the wire or ribbon is to be coated, and also 20 in the upper part of said container a conical roller which. rotates slowly about a spindle 2. According to the invention, the roller is covered with felt or other absorbent material. As seen in ~ the thinnest, and the successively applied coat Fig. l, the lower generatrix t of the roller clips 25 at varying depth into the bath of solution t. ings increase in thickness and, on the other Furthermore, as seen in Fig. 2, the roller is ar hand, that the thickest coating is precisely the ranged so that its lateral generatrix t is located outside the container i. The wire'or strip, in dicated at‘ the various positions by a, a’, b, b’, c, 0', 30 cl, d’, and e to be coated passes against this lat eral generatrix. The place where the wire ?rst _ 25 the one hand, that the ?rst coating of enamel is one which is the least subjected to the oven 3li drying operation. It results furthermore that under these con ditions of enameling and drying, the total mass of enamel distributed around the wireis not homo geneous. Owing to this and to the fact that the 35 ?rst coating is‘ very thin and is treated to too much in the drying oven, said coating does not adhere suf?ciently to the conducting wire and can ‘even become completely separated from the lat ter in the form of a tube. Furthermore the dif 40 ferent layers do not have the same dielectric re sistance, and from layer to layer there is \a dif ferent resistance to acids and benzol. With the process of enameling or varnishing passes over the roller 3 is shown by a line or point a respectively, i. e. the wire passes ?rst of all along the portion of the conical roller 3 which has 35 the largest diameter. it thus receives a ?rst coat ing of, enamel. Thereupon the wire is dried by the drier l, and then passes at the line b a second time over the roller 3, whereby it receives the sec ond coating of enamel. After the second coat 40 ing the wire is again dried, whereupon the process is continued in the same way up to the last coat~ ing. In the example illustrated, it has been as-v according to the invention, these drawbacks are e sumed that five successive coatings are applied, 45 overcome by the fact that successive layers of but obviously this number is quite arbitrary and is 45 decreasing thickness are applied on the wire or only an example, which can be varied according the strip to be treated. to circumstances. The invention furthermore concerns a device As can be seen in the device described, the for carrying out the above process. Said device wire in the position a comes in contact with that 50 essentially comprises a roller over which the wire part of the roller which receives the greatest 50 passes several times at points spaced apart along quantity of enamel solution, since the corre its generatrix ‘and on which a solution of enamel sponding end of the roller 3, dips deepest into the of insulating material is applied, the quantity of bath. Under these conditions the layer of which decreases from one end to the other of the enamel which is deposited on the line a has the 55 vroller. greatest thickness. The thickness of the second 55 2 2,110,011 coating deposited on the line b is slightly less, of detail could be made therein in the spirit of and so on up to the ?fth and last coating. By means of the process according to the in vention, a mass of enamel or insulating material the invention. is thus obtained, the successive layers of which decrease in thickness, and the thickest layers of which are subjected the most often to the action of oven drying. In this manner a perfectly homogeneous coating of enamel or insulating ma 10 terial is obtained, which adheres strongly to the wire. It is pointed out that the embodiment of the device illustrated in the drawing is only a prac I claim: 1. Process of insulating wires for electric pur poses, which comprises alternating steps of coat~ ing the wire with a liquid composition and then setting said composition on the wire by heat, said coating steps comprising the applying of the liquid composition in successive layers of de— creasing thickness. 10 2. Process of insulating wires for electric pur poses, which comprises passing the wire into contact with the surface of a liquid to coat it tical example and that the process according to 15 the invention could be carried out by means of different devices. The essential characteristic of the device consists in the fact that the quantity with a liquid composition, alternating said step of enamel solution distributed over the roller from said liquid surface to said wire in quantities decreasing with each successive application, varies from point to point along its generatrix. 20 It is obvious that the invention is only de scribed and illustrated as a practical example which only serves for the explanation and to which the invention is not limited. Modi?cations with the step of setting said composition on the 15 wire by heat, supplying said liquid surface with said liquid composition, applying the liquid thereby to coat said wire with successive layers of decreasing thickness. WALTER LEO ANKLI.