Patent DE-10215555-A1 (DE)
Title: Utilization of aerodynamic interlacing process to produce chemical filter media involves forming filter media with laminated structure, bringing pre-formed media to heat treatment area, and bringing heat-treated media to cooling area
Inventor: FU STEVEN HAU-CHENG
IPC: B05D5/00
Filed: 2002-04-09
Abstract: An aerodynamic interlacing process to produce chemical filter media is used by utilizing airflow to bring short-cut fibers and functional particulates to a composite air blower; utilizing an air suction device under a multi-layer interlacing forming area, thus forming the filter media with a laminated structure; bringing the pre-formed filter media to heat treatment area; and bringing the heat-treated filter media to a cooling area. The utilization of an aerodynamic interlacing process to produce a chemical filter media includes utilizing airflow to bring short-cut fibers and functional particulates to a composite air blower while the blowing airflow of the functional particulates enters into the composite air blower from the center; utilizing an air suction device under a multi-layer interlacing forming area to adsorb the short-cut fibers and the functional particulates for sequentially piling up on a moving forming matrix while the suction air volume of the air suction device can be adjusted as desired to create a balance between the suction air and the mixed blowing air so that the filter media is formed with a laminated structure having three layers of from sparse to dense; bringing the pre-formed filter media to a heat treatment area over which a heat source is provided for heating the filter media while the heating temperature is controlled at 120-180 degrees C; and bringing the heat-treated filter media to a cooling area, where a further air suction device under the filter media continues to operate. The composite air blower is constructed as a conventional blowing apparatus. It is not restricted to the round figure, but preferably rectangular to form a narrow and slim blowing mouth, thus enabling the blowing air of the short-cut fibers and the functional particulates to enter into a diffusing mixing conveying area at the same time so that the mixed airflow diffuses the short-cut fibers and the functional particulates from the top to the bottom which flow afterwards through an air guide device so that the airflow is able to smoothly bring them to the multi-layer interlacing forming area beneath. An Independent claim is also included for a structure of utilizing an aerodynamic interlacing process to produce chemical filter media, and more particularly to filter media with controllable microstructure by interlacing short-cut fibers and functional particulate matter with each other, comprising a protection layer (81) situated at the bottom of the pre-formed filter media and mainly comprising the short-cut fibers (1), showing a dense fiber accumulation state; an adsorptive layer (82) situated at the top of the protection layer and mainly comprising the functional particulates (2) that are evenly interlaced with the short-cut fibers to create a three-dimensional structure; and a flow equalizing layer (83) situated at the top of the adsorptive layer and mainly comprising the short-cut fibers, showing a sparser piled state. The density of the functional particulates is lower, while the density of a space between the heat-treated short-cut fiber aggregates is greater, thus creating tortuous flow paths between the short-cut fibers and the functional particulates.