Separator for an alkaline cell and a method of producing the separator
US6270833A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Mar 17, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49115
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A new separator for an alkaline cell is provided, which can prevent deformation to an end of the separator and also prevent short circuits within the cell structure when an external force is added to the cell. The separator has a characteristic that a ratio of a tensile strength of a longitudinal direction of a separator base paper and a tensile strength of a widthwise direction of the base paper is within a range of 2/1 to 1/1. The invention provides a new method of producing the separator. The method permits reliability in sealing properties of a closed bottom end and high productivity. The method has the steps of: winding the base paper to form a cylindrical body; subjecting the cylindrical body to a closed bottom forming step while the cylindrical body is held by a clamping device to maintain its cylindrical shape; heat-bonding an end of the cylindrical body to close the end; and releasing the cylindrical body from the cylindrical clamping device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.