| 摘要 |
814,774. Non-metallic tubes. ELECTRIC STORAGE BATTERY CO. Jan. 7, 1957, No. 550/57. Class 99(2). [Also in Group XXXVI] A porous tube for use as a retaining sheath for the pencil electrode of a storage battery and consisting of a sheet of glass fibres rolled about an edge to form a multilayer tube, has the outer layers bonded together and the inner layers unbonded to the outer layers. The bonding of the outer layers can be effected by impregnating only part of the glass fibre sheet with binder before rolling. Thus the sheet (shown in section in Fig. 2 )can be creased at 11 to form two sections 10a, 10b and the section 10a impregnated by drawing it along the surface of the binder solution 13. The sheet is then partially dried, wrapped about a hollow mandrel with the unimpregnated section 10b inserted through a slot therein and heated, e.g. to 350-450‹F., to bond the outer layers together. The binder may be a solution of polystyrene in methyl-ethylketone or a water dispersion of polystyrene and dibutylphthalate. A wetting agent may be added to the binder. |
