POLYMER PROCESSING

::SINTER-BONDED SCREEN PACKS::


What is Sintering?


Sintering is a process by which multiple layers of woven wire mesh can be laminated together using only heat and pressure, without the addition of any binding agent. Technically, the sintering process yields a molecular diffusion-bond at all points where metal surfaces are touching, for example within each layer where the wires cross each other, or between layers, at all points where the layers touch each other.

When properly performed, the sintering process leaves wire mesh clean and bright, free of oils and lubricants, and solution annealed for maximum corrosion resistance. The process also has the ability to reduce the carbon content of the wire mesh to “L”-grade levels (<.03%) so that the mesh will not be susceptible to intergranular corrosion, and will pass the Strauss Test per ASTM A-262, Practice “E”.

Why Sintered Screenpacks?


When multiple-layer packs are sintered together, the resulting laminate takes on a completely different and superior character as compared with a frame-bound or spot-welded pack. Some of these advantages are as follows:

  • Mechanical Strength

The sintered pack exhibits much greater strength and rigidity than an unsintered pack. This means the pack can withstand higher pressures and throughputs without deflecting or dishing. Freedom from deflection means more uniform flow across the pack surface without “peaking” in the center.

  • Structural Integrity

The sintered pack will be completely free from media migration. No wire fragments can come loose and damage the spinerette. Sintering eliminates the pack separation and channeling which are common to unsintered multi-layer media as contaminant and gels accumulate internally. Residence time is decreased, throughput is increased, and shear is imparted more uniformly to the filtrate.

  • Maintenance of Filtration Rating

The wires in conventional unsintered meshes tend to shift and separate as gels and other contaminants are forced through under pressure. The result is that some of the pores open up over time, and the filtration integrity of the pack is compromised. In a sintered pack, the wires in each layer of mesh are securely fused together and will not shift. Therefore the micron rating and bubble point of the pack will remain constant throughout its life.

  • Cleanability

Sintered wire mesh packs can withstand many cleaning processes some of which would destroy conventional packs, including pressure washing, oven burn-off and furnace firing, caustic baths, passivation baths, solvent cleaning, ultrasonic cleaning and other processes used by professional filter cleaning companies.

 




Martin Kurz & Co., Inc.

8439 Triad Drive • Greensboro, NC, USA 27409
Ph: 336-217-3814 • Fax: 336-668-4452
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