| 摘要 |
<p>PURPOSE: To improve a gas ventillation property for generated gas so as to reduce electric resistance by producing a glass mat made of one or more kind of glass fiber with a mean fiber diameter and a fiber length within specific ranges by means of a wet paper making method and providing a longitudinal fiber orientation property. CONSTITUTION: In a glass mat produced by a wet paper making method and composed of one or more kind of glass fiber with a mean fiber diameter of 13-20μm and a fiber length of 10-30mm, a longitudinal fiber orientation property is provided. In the glass mat, a ratio of strength in the longitudinal direction to that in the lateral direction is desirably 4/1 or more. In this way, gas passages are formed in the orientation direction of the fiber, and the gas generated in use of a battery hardly stay in the glass mat and easily passes through to the upper part of the battery. Therefore, an exclusion ratio of dilute sulfuric acid by the gas is reduced, and electric resistance can be lowered.</p> |
