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Introduction
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Component Supplys stock of filter mesh is a versatile material used in multiple industries and in a variety of applications. To assist researchers and product designers in choosing the best mesh for their applications, we want to define and explain the different properties of our mesh and how they impact each other.
There are seven major attributes of mesh: 1) mesh opening, 2) open area, 3) mesh count, 4) thread diameter, 5) weight, 6) thickness and 7) air permeability. At Component Supply, we dont list weight, thickness or air permeability in our product information because, unlike the first four specifications, these three are not typically relevant in determining mesh use most applications. However, to give you a full picture of mesh properties, we will provide a simple definition for those terms as well.
Mesh Attributes
1) Mesh Opening refers to the actual size of the opening. In the charts on our site, this is measured in microns. Mesh opening is typically the most critical attribute because it determines the size of the particles it will capture and the size of the particles it allows to pass through. This attribute is specified in microns, which is a metric measurement equaling one thousandth of a millimeter.
2) Open area indicates the percentage of a specified area that is open. Open area can help determine what sort of flow restrictions might occur because of the filter. If we take a square piece of mesh screening that is exactly one inch by one inch and move all the lateral and horizontal fibers (warp and weft we will cover this in another post or video) up and to one side we will be left with some part of the square that is solid (covered by the threads) and some part that is now open. With a mesh that has a 25% open area the square inch will be segmented into four parts, three (75%) will be covered by the threads and one (25%) will be open.
3) Mesh count is the number of threads in a linear inch and is fairly easy to determine. For example, if you were to lay out a piece of mesh and place a ruler on top, then count the horizontal threads from the beginning of the ruler to the one inch mark that would give you the mesh count. Of course, this is a simple task for mesh sizes like microns, which has 19 threads per inch. But it is daunting or even flat out impossible for some of the smaller mesh sizes. For mesh sizes down to about 200 microns you can count, or at least count one quarter of an inch and multiply. For sizes much smaller than that, it becomes difficult without some magnifications and a good bit of patience.
4) Thread diameter is the diameter of the thread measured in microns.
5) Weight is the weight of the material typically measured in ounces per square inch.
6) Thickness is the overall thickness of the mesh and measured in microns.
7) Air permeability measures the rate of air flow passing perpendicularly through the mesh and, for our mesh, is measured liters (l)/square meter (sq. m.)/second (s).
The Relationship between Mesh Attributes
When selecting the appropriate mesh for an application it is important to know how these attributes are related to each other. Lets use an example of mesh that has a 500 micron mesh opening, a 50% open area, a thread count of 20 and a thread diameter of 250 microns. If we were to change just one of these attributes, it would completely alter the product youd be using. For example, if we decreased the thread diameter but left the mesh count constant, we would wind up with a larger mesh opening and open area. If we needed to capture smaller particles with a smaller mesh size, but wanted a similar open area for flow restriction reasons you could find a mesh that has the same thread diameter and a higher mesh count, or you could find a mesh that has an increased thread diameter and keep the thread count constant.
Conclusion
Understanding the attributes of mesh and how they relate, makes selecting it for a specific application less daunting. That being said there are not an infinite number of possibilities available. This mesh is woven on looms that produce as much as 10,000 meters at a time, so only very large filtration and screen printing applications get to choose what they really want in terms of mesh properties. While there may be other sizes, and we encourage you to ask about them, the specifications on our site represent most of what is available. Understanding the properties of mesh and how they are related and then purchasing based on that information is more effective and realistic than trying to customize your own mesh.
FILTER CLOTH SELECTION
Determining the proper cloth construction requires knowledge of the slurry characteristics and the filtration requirements. Below are some of the factors we consider in the filter cloth selection process.
Contact M.W. Watermark to learn more about how to identify or measure these variables.
The above data helps in determining the following:
Common filter cloth materials
If you want to learn more, please visit our website Huaqiang.
Polypropylene
Polypropylene is the standard for filter cloths and performs ideally in most applications. This material can withstand higher temperatures, does not easily succumb to blinding (clogging of the weave) and has a smooth surface which aids in cake removal. However, its important to know the make-up of the slurry before assuming that polypropylene is the material of choice. For example, if the slurry is bleach, polypropylene will not be compatible, and polyester filter cloth materials must be used. Latex borders can be applied to a non-gasketed cloth to provide a better seal under pressure.
Nylon
This durable fiber is often chosen for its long life in the face of abrasives. Though higher in cost, nylon blends offer such durability that the higher cost can be justified by longer service life.
Polyester
Often chosen when sustained operating temperatures are over 180 degrees, or when oxidizing agents are present.
FILTER CLOTH FIBER TYPES
Filter cloths are manufactured using synthetic fibers.
FILTER CLOTH FABRIC WEAVES
ADDITIONAL WEAVE PATTERNS
FABRIC FINISHING
Finishing of the fabric enhances the cake release, filtration quality and stability.
Contact M.W. Watermark to discuss your particular application.
For more Polyester Filter Meshinformation, please contact us. We will provide professional answers.
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