Open-weave meshes

Geosynthetic-enhanced erosion control netting (ECN), open weave meshes, and ECBs. 

Open-weave mesh Low to moderate cost moderate sediment yields moderate vegetative density moderate moisture absorption Temporary (1—2 years) low flows only not complete ground cover moderate moisture absorption... 

Square-mesh cloth is the conventional type of screen cloth, but there are many types of cloth with an oblong weave. This latter construction provides greater open area and capacity and in addition makes it possible to use stronger wire for the same size of screen opening and for the same percentage of open area. 

Generally, any septum having an opening of less than 0.005 in. should be satisfactory for the medium flow rate filter aids. In metal cloths the most commonly used weave is 24 X 110 single dutch with 0.016 in. x 0.011 in. wire. A 60 x 60 twill with 0.011 in. wire and a 70 X 80 twill with 0.007 in. wire are also satisfactory. Keep in mind that mesh does not necessarily indicate the size opening it also depends upon the wire diameter. 

A variant is gauze weave, which is an open mesh type with only one filling yarn, whereas leno has more than one. 

Style No. Weave Weight (oz/yd ) Threads/in.,Warp x Weft Thread Diam., Warp X Weft (/an) Mesh Opening (/rm) Air Permeability (ft /min) Thickness (tim)... 

Marquisette inar-kw3- zet [marquise + -eUe] (1908) n. A lightweight, open-mesh fabric made of cotton, silk, or manufactured fibers in a leno, doup, or gauze weave. Marquisettes are used for curtains, dresses, mosquito nets, and similar end uses. 

Ninon ne- nan [prob. fr. F Ninon, nickname for Anne] (1911) n. A hghtweight fabric of silk or manufactured fibers made in a plain weave with an open mesh. Used for curtains and evening wear. NIP (1) The line or area of contact between two contiguous rollers. (2) A defect in yarn consisting of a thin place. 

When the twilled weave is woven with multiple wires in both warp and shute, it results in a strong, dense fabric known as braided, basket or multibraid weave. The mesh openings are irregular because the multiple shute wires have a tendency to twist around each other. 

Mesh Count Nominal Wire Diameter (in.) Mesh Opening (in.) Open Area (%) Weave Thickness Range (in.)... 

As speculated in Chapters 4 and 5 it is believed that the shape of the actual pore structure is a secondary influence (the primary influence being the fineness of the screen) on the effective pore diameter. For example, for Dutch Twill meshes, these openings are complex 3D structures. The equilibrium L/V interface shape is complex and it depends on the size and packing of the wires. If it were possible to observe microscopically a L/V interface within a Dutch Twill weave, it might be possible to imderstand why the 450 X 2750 outperforms the 510 x 3600. Meanwhile, it is much more efficacious to look at deeper correlations between the pore diameter and geometrical properties of the mesh like the warp and shute wire diameters. Since the warp and shute diameters are a maj or factor in determining the pore shape it is likely that they have a relationship with the pore diameter. 

Filter packages are usually a stack of screens, going from coarse to fine in the streamline direction, on top of a support plate with holes for further distribution of the flow. Screens are plain-weave, or sometimes twill-weave, steel wire fabrics. Their fineness is indicated in mesh (threads per inch), openings per cm, or pore size in microns. For example, 325 mesh = 16 800 opening s cm 40 pm. 500 mesh (25 pm) filtration is common in melt spinning. For even finer filtration, steel nonwoven materials are used, with a filter fineness going down to 5 pm. 

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