NONWOVEN FILTER MEDIUM

Nonwoven webs and filter media are described herein having a region that has a gradient wherein the concentration of a fiber or a property varies from one side of the region to the other side of the region. In one embodiment， an apparatus includes a mixing partition downstream from one or more sources of a first and second flow stream that each includes a fiber. The mixing partition defines one or more openings that permit fluid communication between the two flow streams. The apparatus also includes a receiving region situated downstream from the one or more sources and designed to receive at least a combined flow stream and form a nonwoven web by collecting fiber from the combined flow stream. In one embodiment， a method includes collecting fiber on a receiving region situated proximal and downstream to the source or sources of the flow stream， where the receiving region designed to receive the flow stream dispensed from the source and form a wet layer by collecting the fiber. Nonwoven webs and filter media are described herein having a region that has a gradient wherein the concentration of a fiber or a property varies from one side of the region to the other side of the region. In one embodiment， an apparatus includes a mixing partition downstream from one or more sources of a first and second flow stream that each includes a fiber. The mixing partition defines one or more openings that permit fluid communication between the two flow streams. The apparatus also includes a receiving region situated downstream from the one or more sources and designed to receive at least a combined flow stream and form a nonwoven web by collecting fiber from the combined flow stream. In one embodiment， a method includes collecting fiber on a receiving region situated proximal and downstream to the source or sources of the flow stream， where the receiving region designed to receive the flow stream dispensed from the source and form a wet layer by collecting the fiber.

本文所描述的非织造纤网（nonwoven web）与过滤介质，其具备一处梯度区域，区域内纤维浓度或某一性能自区域的一侧至另一侧呈梯度变化。在一个实施例中，所述装置包含设置于第一料流源与第二料流源下游的混合隔板，所述第一料流与第二料流均包含纤维。该混合隔板开设有一个或多个开口，以实现两股料流之间的流体连通。所述装置还包含设置于所述料流源下游的接收区域，该接收区域用于至少接收合并后的料流，并通过收集合并料流中的纤维以形成非织造纤网。在一个实施例中，所述方法包括在靠近且位于料流源下游的接收区域上收集纤维，该接收区域用于接收从料流源喷出的料流，并通过收集纤维以形成湿层。本文所描述的非织造纤网（nonwoven web）与过滤介质，其具备一处梯度区域，区域内纤维浓度或某一性能自区域的一侧至另一侧呈梯度变化。在一个实施例中，所述装置包含设置于第一料流源与第二料流源下游的混合隔板，所述第一料流与第二料流均包含纤维。该混合隔板开设有一个或多个开口，以实现两股料流之间的流体连通。所述装置还包含设置于所述料流源下游的接收区域，该接收区域用于至少接收合并后的料流，并通过收集合并料流中的纤维以形成非织造纤网。在一个实施例中，所述方法包括在靠近且位于料流源下游的接收区域上收集纤维，该接收区域用于接收从料流源喷出的料流，并通过收集纤维以形成湿层。