| 摘要 |
663,811. Batteries. BURNDEPT, Ltd., LEWIS, R. W., and ROWE, L. R. Oct. 22, 1947 [Jan. 18, 1946], No. 1810/46. Class 53. The zinc cups of a battery of the layer type which may be as described in Specification 579,986 are lined with sheets of cardboard &c., which carry the electrolyte where they make contact with the bottoms of the cups and insulate the sides of the cups from adjacent cups, the sides of the linings being rendered impermeable by an insulating substance which is applied by a printing process to a continuous thin cardboard band which is then cut into sheets from which the linings are formed. The insulating substance may be delivered to the printing roller as an ink of bitumen dissolved or softened by a solvent, or of a plasticized or dissolved synthetic plastic material. The band is printed on both sides either by separate rollers or by passing the band twice over the same roller. Teeth on the roller enter holes in the band to ensure accurate registration of the unprinted areas on the two sides of the band. The Figure shows a part of a band of thin card which will absorb and retain the electrolyte in the unprinted areas 3, the edges of the band being provided with holes 2. The blank areas 3 may be produced by forming the surface of the printing roller with corresponding openings. After the band has been printed on one side it is passed through an oven to evaporate the volatile constituents of the ink and to melt the bitumen or plastic which then penetrates into the band. The printing, drying and impregnating processes are then repeated on the other side of the band. The linings for the zinc cups are then cut or punched out as shown at 4. The punching machine may also crimp the corners 5 of the linings which may be inserted in the cups by the machine described in Specification 642,361, or the punch of this machine may be shaped to pleat the corners as the lining is being forced into the cup. Alternatively the punch may cut out the surplus cardboard at the corners. The zinc band from which the cup blanks are formed may also be provided with a coating of an insulating varnish applied by a printing process. Specification 660,554 is referred to. |
