Extruded Feed Spacers Enhance the Performance of RO Membrane Elements

Flow channel feed spacers provide channels for the flow of the feed water. They are the essential parts of spiral-wound membrane (SWM) modules in reverse osmosis and nanofiltration. These mesh spacers act as an important role in determining the hydraulic conditions of the feed channel. The configuration and orientation of feed spacers affect the flux, pressure losses and fouling in the membrane process. This indirectly influences the unit cost of water production.

Feed mesh spacers are made of polypropylene through a single-step continuous extrusion process. The cross-section of feed spacers is thick which can endure the liquid impact. The middle part of the node is slightly thinner than the integral joints. Because of the extruding process, the shape looks like a slightly twisted. As an extruded plastic mesh manufacturer, we provide diamond netting and square netting for different feed water types.

The feed spacer was covered with drops of water.
Reverse osmosis feed spacer
Here is the diagram of the feed spacer geometry.
Feed spacer geometry
There is a piece of clear extruded feed spacer mesh.
Clear extruded feed spacer mesh
The structural composition of the spiral-wound membrane.
Filter scheme of spiral-wound membrane

Feature

  • Twisted filaments for higher mass transfer.
  • Achieve a balance between competing concerns.
  • Bi-planar construction creates flow channels across the filter medium.
  • Improve the flux without increase in pressure losses.
  • Hydrophilic surface is resistant to the adhesion of bacteria & proteins.
  • Various geometric configurations available.

Specification

  • Material: polypropylene.
  • Thickness: 14 – 38 mil.
  • Hole Shape: diamond, square.
  • Width: 30–55".
  • Weight: 80–230 g/m2.
  • Length: 500', 1000'.
  • Package: packed into plastic bags, shipped by pallet.
Specification of Flow Channel Feed Spacer – Diamond Hole
Picture
Item No. 2001 2202 2203 3004 3305
Thickness (mil) 20 22 22 30 33
Tolerance (mil) ±2 ±2 ±2 ±2 ±2
Hole Shape Diamond Diamond Diamond Diamond Diamond
Hole Size (inch) 0.011 × 0.011 0.015 × 0.015 0.015 × 0.015 0.018 × 0.018 0.016 × 0.016
Strand Per Inch 43 37 37 30 28
Width (inch) 30 36.5 40 40 40
Length (feet) 500 500 500 500 500
Specification of Flow Channel Feed Spacer – Square Hole
Picture
Item No. 1406 1407 1908 1909 2110 3611
Thickness (mil) 14 14 19 19 21 36
Tolerance (mil) ±2 ±2 ±2 ±2 ±2 ±2
Hole Shape Square Square Square Square Square Square
Hole Size (inch) 0.21
×
0.027
0.025
×
0.030
0.040
×
0.053
0.054
×
0.080
0.040
×
0.053
0.030
×
0.037
Strand Per Inch 25 27.6 × 25 17 × 14.6 15 × 11 16 16 × 13
Width (inch) 30.59/37.5 43.5 43.5 54.5 40 47.5
Length (feet) 500 500 500 500 500 500

Application

Feed spacers are professional used in spiral-wound membrane (SWM) modules in reverse osmosis and nanofiltration system.

A section picture of the spiral wound membrane module.
The spiral wound membrane is made with feed spacer mesh
A detail picture show the structure of spiral wound membrane module.
The section detail of spiral wound membrane
Schematic representation of a spiral-wound membrane module.
Schematic of spiral-wound membrane module
There are feed spacer mesh rolls on the shelf..
Feed spacer mesh are packed in roll

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Boegger Industrial Limited
Email: recycled@plasticscreenmesh.com

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