| 摘要 |
A plurality of staple fibers and a plurality of binder fibers are substantially homogeneously mixed. The binder fibers include polyphenylene sulfide. The mixed fibers are heat pressed to form at least one sheet of nonwoven substrate. The nonwoven substrate is made up of at least 5 wt. % of staple fibers and at least 5 wt. % of binder fibers.
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