Liquid Filter Bag Basics
Pictured above: Replacement Elements Table
Pictured above: Micron Rating at % Efficiency
Pictured above: Equivalent Opening Sizes in Plain weave Wire Cloth
Relative Sizes of Particles and Comparison of Dimensional Units
Wire Cloth - Wire cloth as a surface type filter (or strainer). It is usually specified by its mesh (or mesh count). This indicates the number of openings (or fractions of openings) in a lineal inch. It does not directly indicate the size of the openings, which can vary depending on the wire diameter (The equivalent size table is based on industry standard wire sizes.)
Terminology includes:
Space:
Clear opening or space between parallel adjacent wires, expressed in inches.
Fill Wires:
Wires running the short way of the cloth as woven. Also called "shute" or "shoot" wires.
Warp Wires
Wires running the long way of the cloth as woven.
Square Mesh
Wire cloth with the same mesh count in the fill and warp. Also called "plain weave".
Rectangular Mesh
Wire cloth with a different mesh count in the fill than in the warp. Also called "oblong mesh" or in finer meshes "off count".
Cellulose and Synthetics
Depth type filters can be made of cellulose (paper) or synthetic materials, and are used generally for finer filtration tasks than wire cloth. Non-cleanable.
Filter Bag Materials
Absolute Rating
The size, usually in microns, of the largest opening or pore in a filter element.
Nominal Rating
Used to size depth-type filters, which have no consistent opening size, it's based on the mean flow pore size.
Mean Flow Pore Size
Indicates that half the flow passes through openings of equal or smaller size and the rest flows through openings of larger size.
Terminology includes:
Space:
Clear opening or space between parallel adjacent wires, expressed in inches.
Fill Wires:
Wires running the short way of the cloth as woven. Also called "shute" or "shoot" wires.
Warp Wires
Wires running the long way of the cloth as woven.
Square Mesh
Wire cloth with the same mesh count in the fill and warp. Also called "plain weave".
Rectangular Mesh
Wire cloth with a different mesh count in the fill than in the warp. Also called "oblong mesh" or in finer meshes "off count".
Cellulose and Synthetics
Depth type filters can be made of cellulose (paper) or synthetic materials, and are used generally for finer filtration tasks than wire cloth. Non-cleanable.
Filter Bag Materials
Absolute Rating
The size, usually in microns, of the largest opening or pore in a filter element.
Nominal Rating
Used to size depth-type filters, which have no consistent opening size, it's based on the mean flow pore size.
Mean Flow Pore Size
Indicates that half the flow passes through openings of equal or smaller size and the rest flows through openings of larger size.
Plain Weave (square mesh)
Each warp wire and each fill wire passes over one and under one another, in both directions. The most commonly used weave
Each warp wire and each fill wire passes over one and under one another, in both directions. The most commonly used weave
Double or (Triple) Warp
The same pattern as plain or plain - dutch except there are two or three warp wires in place of just one.
The same pattern as plain or plain - dutch except there are two or three warp wires in place of just one.
Plain Dutch Weave - The same pattern as plain weave but the warp wires are of large diameter than the fill wires. The fill wires are driven close to each other, making tapered or wedge shaped openings instead of square ones. The warp remain straight and the fill has all the crimps.
Twilled - Dutch Weave
The same pattern as twilled wave, but the warp wires are of larger diameter than the fill wires. The warp wires are straight and the fill wires driven up tight, have all the crimps, both up and down and sideways. Openings are wedge shaped.
The same pattern as twilled wave, but the warp wires are of larger diameter than the fill wires. The warp wires are straight and the fill wires driven up tight, have all the crimps, both up and down and sideways. Openings are wedge shaped.
Twilled Weave
Each fill wire passes over and under two war wires at a time, and each warp wire passes over and under two fill wires at a time.
Each fill wire passes over and under two war wires at a time, and each warp wire passes over and under two fill wires at a time.
