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Category: Polyester mesh

Category: Polyester mesh

Introduction

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Component Supply&#;s 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 don&#;t 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. Let&#;s 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 you&#;d 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.

 

how to select the proper filter cloth for your application

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.

  • Is the cake or the filtrate a product?
  • pH?
  • Slurry temperature?
  • Slurry particle size?
  • Is the slurry preconditioned (Polymer, DE, Ferric, Lime, etc.)?
  • Abrasive, coarse particles?
  • Existence of solvents, oils or greases?
  • Number of filtration cycles per day?

The above data helps in determining the following:

  • Fabric raw materials / compatibilities
  • Type of yarn (fibers)
  • Fabric weave
  • The type of fabric finishing needed to produce the best filter cloth for the application

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, it&#;s 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.

  • Monofilament: Single, smooth, continuous extrusion. Highest flow rates, good resistance to blinding, good abrasion and scaling resistance. Fibers are typically between 4 mil and 10 mil (.004&#; to .01&#;) in diameter. Best cake release.

  • Multifilament: Multiple continuous fibers twisted together to form one yarn. Excellent retention for smaller particles. Good cake release.

  • Staple (Spun): Short lengths of fibers (similar in appearance to cotton) spun into a yarn. Tends to have a &#;hairy&#; appearance. Best solids retention. Poorest cake release.

FILTER CLOTH FABRIC WEAVES

  • Satin: Satin Weave (or Sateen Weave) has a smooth surface caused by carrying the warp yarn on the fabric surface over many weft yarns. Intersections between warp and weft are kept to a minimum. Very flexible, easily conforms to most curved surfaces. Satin weave is popular for its excellent cake release and resistance to blinding. Particle retention is average.

  • Twill:  Twill Weave adds a diagonal rib or &#;twill&#; line into the weave, adding strength at the expense of some stability. These diagonals are caused by moving the yarn intersection one weft thread higher on successive warp yarns. Cake release is average. Average resistance to blinding.

  • Plain: Plain Weave (or Checkerboard Weave) is the most basic weave, with a weft thread alternately going over one warp thread and then under one warp thread. Average in strength, cake release, and stability. High particle retention and low resistance to blinding.

ADDITIONAL WEAVE PATTERNS

  • Leno Weave: The leno weave involves two or more warp threads crossing over each other and interlacing with one or more filling threads. This is known as a &#;locking&#; weave, as it is mainly used to prevent the shifting of fibers in open weave fabrics. This type of weave is usually only found in backing cloths.
  • Basket Weave: Basket weave is a variation of the plain weave. Two or more warp yarns alternately cross with two or more filling yarns. Stronger than a plain weave, at the expense of stability. Typically used for backing cloth or basic applications requiring additional strength.

FABRIC FINISHING

Finishing of the fabric enhances the cake release, filtration quality and stability.

  • Singeing: Removal of fibers on the surface of staple and felt fabrics to enhance cake release.
  • Calendaring: With use of heated compression rolls, the fabric is &#;melted&#; to adjust the permeability and provide a smoother surface for cake release.
  • Heat Setting: Through a wet or dry process to create a dimensional stable fabric that will not shrink, stretch, etc.

 

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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