Channel flow filter

A method of using a filtration medium having high efficiency and a low pressure drop to reduce vapor concentration levels in a barrel, the method comprising the steps of:

• providing a filtration medium having a plurality of filtration layers, wherein at least one filtration layer has a multi-dimensional channel pattern formed therein creating a plurality of continuous, tortuous channels across the at least one layer and a multi-dimensional edge at each end of the plurality of channels, the plurality of filtration layers configured as a stack with the channel pattern of the at least one layer defining a plurality of inlets open through a first face of the stack, a corresponding plurality of disruptive fluid pathways through the stack, and a plurality of outlets open through a second face of the stack;
• and
• placing the filtration medium in the barrel where vapor concentration levels are to be reduced.

A filtration medium possessing high efficiency and low pressure drop comprising:

• a plurality of filtration layers wherein at least one layer has a multi-dimensional channel pattern formed therein creating a plurality of continuous, tortuous channels across the at least one layer and a multi-dimensional edge at each end of the plurality of channels, the plurality of filtration layers configured as a stack with the channel pattern of the at least one layer forming a plurality of inlets open through a first face of the stack, a plurality of outlets open through a second face of the stack and a corresponding plurality of disruptive fluid pathways passing from the inlets through the stack to the outlets, with at least some of the plurality of filtration layers formed from non-woven filter material including multi-layer fiber strands that have a polymer core and at least one outer layer of adhesive material.

A filtration medium possessing high efficiency and low pressure drop comprising:

• a plurality of filtration layers wherein at least one layer has a multi-dimensional channel pattern formed therein creating a plurality of continuous, tortuous channels across the at least one layer and a multi-dimensional edge at each end of the plurality of channels, each tortuous channel configured as a repeating plurality of undulations including at least two wave lengths along a length of the channel for causing increased perturbation of a fluid stream passing through the channel, the plurality of filtration layers configured as a stack with the channel pattern of the at least one layer forming a plurality of inlets open through a first face of the stack, a plurality of outlets open through a second face of the stack and a corresponding plurality of disruptive fluid pathways passing from the inlets through the stack to the outlets.

A method of forming a filtration medium having high efficiency and a low pressure drop, the method comprising the steps of:

• providing a plurality of filtration layers formed from a non-woven filter material including multi-layer fiber strands that have a polymer core and at least one outer layer of adhesive material, at least one layer of which includes a multi-dimensional channel pattern including a plurality of continuous, tortuous channels across the at least one layer and a multi-dimensional edge at each end of the plurality of channels on the at least one layer;
• and
• stacking the plurality of filtration layers such that the multi-dimensional channel pattern of the at least one layer forms a plurality of inlets open through a first face of the stack, a corresponding plurality of disruptive fluid pathways through the stack, and a plurality of outlets open through a second face of the stack.

A method of forming a filtration medium having high efficiency and a low pressure drop, the method comprising the steps of:

• providing a plurality of filtration layers, at least one layer of which includes a multi-dimensional channel pattern including a plurality of continuous, tortuous channels across the at least one layer and a multi-dimensional edge at each end of the plurality of channels on the at least one layer, each tortuous channel configured as a repeating plurality of undulations including at least two wave lengths along a length of the channel for causing increased perturbation of a fluid stream passing through the channel;
• and
• stacking the plurality of filtration layers such that the multi-dimensional channel pattern of the at least one layer forms a plurality of inlets open through a first face of the stack, a corresponding plurality of disruptive fluid pathways through the stack, and a plurality of outlets open through a second face of the stack.