| 摘要 |
1415958 Storage batteries YUASA BATTERY CO Ltd 5 June 1973 [12 July 1972] 26859/73 Heading H1B A microporous sheet material may be made by adding ethanol to a THF solution of P.V.C., depositing the mixture on a non-woven fabric of polyester or polypropylene, and drying out. The material may be used alone, or heat sealed or otherwise adhered to an acrylic or styrenic bound glass mat or to a porous synthetic resin plate or a non-woven fabric, or used with a synthetic resin net. The material is folded over a plate of a lead acid battery and heat-sealed along one or more edges to form an envelope separator largely impervious to antimony. The backing materials may be chosen to space the separator from the plate to allow escape of gas or the microporous sheet material may have integral ribbing for this purpose. Slits are provided in the material before or after application to the plate to allow displaced active material to drop out of the bottom of the separator-the material is left intact in the region of the plate legs. The apparatus shown forms the envelope separators about the plates 3. Separator sheet 8 is drawn from supply roller 14 by a claw 16 and during a stationary interval is formed with slits by blade 17. When the sheet has moved on, plate 3 is pushed into the separator from a carriage 18 while the sheet end is held by claw 16<SP>1</SP>. The sheet is cut by blades 20 and the enveloped plate drawn between conveyers 22, 23 which are halted to allow use of the heatsealing tool 24 before being retracted to eject the enveloped plate on to a carriage 25 where a suitable plate stack (e.g. of plates alternately of opposite polarity) is built up. Claw 16<SP>1</SP> reaches up for the free end of the sheet material 8 to continue the process. |
