阅读说明：本技术 长纤维无纺布和使用该长纤维无纺布的过滤器增强材料 (Long fiber nonwoven fabric and filter reinforcing material using same ) 是由 吉田英夫 胜木千晶 西条正大 于 2019-03-18 设计创作，主要内容包括：该长纤维无纺布由双折射率(Δn)为0.005至0.020、结晶度为25％以下并且平均纤维直径为30μm至60μm的纤维组成,并且所述长纤维无纺布的单位面积的质量为50g/m<Sup>2</Sup>至120g/m<Sup>2</Sup>,并且在80℃、5.2kPa的压力下压制10秒的折叠角为15°以下。这种构造得到了适用于过滤器增强材料的打褶性以及满足褶形式保持性能的刚性。(The long fiber nonwoven fabric is composed of fibers having a birefringence (DELTA n) of 0.005 to 0.020, a crystallinity of 25% or less, and an average fiber diameter of 30 to 60 [ mu ] m, and has a mass per unit area of 50g/m 2 To 120g/m 2 And a folding angle of 15 DEG or less when pressed at 80 ℃ under a pressure of 5.2kPa for 10 seconds. This configuration results in pleatability suitable for the filter reinforcing material and rigidity satisfying the pleat form retention performance.)