Composite filter media
    3.
    发明授权
    Composite filter media 失效
    复合过滤介质

    公开(公告)号:US5993501A

    公开(公告)日:1999-11-30

    申请号:US24908

    申请日:1998-02-17

    摘要: A composite filter media includes a fibrous filtration layer of randomly oriented fibers and one or more pleatable stiffening layers which enable the composite filter media to be pleated and hold or retain its pleats. The pleatable stiffening layer(s) may enhance the dirt holding capacity of the composite filter media especially when positioned upstream of the fibrous filtration layer. The composite filter media may also include a flexible covering layer which functions to block the loss of fibers from the fibrous filtration layer. Preferably, the mean fiber diameter of the fibers in fibrous filtration layer increases and the density of the fibrous filtration layer decreases throughout the thickness of the fibrous filtration layer from one major surface to the other major surface of the fibrous filtration layer.

    摘要翻译: 复合过滤介质包括随机取向的纤维的纤维过滤层和一个或多个可褶皱加强层,其使得复合过滤介质能够打褶并保持或保持其褶皱。 打褶的加强层可以增强复合过滤介质的污垢保持能力,特别是当位于纤维过滤层的上游时。 复合过滤介质还可以包括柔性覆盖层,其功能是阻止纤维过滤层的纤维损失。 优选地,纤维过滤层中的纤维的平均纤维直径增加,纤维过滤层的密度从纤维过滤层的一个主表面到另一个主表面的纤维过滤层的厚度减小。