Fine stainless steel wire

The Stedman-type column is shown in Fig. 11, 56, 25. The characteristic features are (i) the use of a fine stainless steel wire cloth formed into conical discs, and (ii) an accurately fitting Pyrex glass jacket, produced by shrinking Pyrex glass on mandrels to the required inside dimensions. Modifications incorporating a silvered vacuum jacket and an electrically-heated jacket are marketed. This column is said to possess high efficiency but is expensive. It is generally employed in conjunction with a total-condensation variable take-off still head. 

Blocked needles are a problem. The only effective way of unblocking them is with fine stainless steel wire, provided for the purpose by some manufacturers. This is fed in from the tip end widi a pair of forceps, and needs great patience and some skill. The moment one pushes too hard, the wire kinks and has to be discarded. One has to proceed a millimetre or two at a time. However, with the price of microlitre syringes, it is well... 

One printing technique that will apply adhesive to such shapes is the screen. Silk screens have long been used to apply paste-type inks to flat surfaces and even to simple curved surfaces such as cans and bottles. Many of the paste-type structural adhesives can be suitably deposited in intricate flat shapes by this means. Rather than the conventional silk screens, however, screens made from fine stainless steel wire are more suitable. The thickness of the deposit is determined by the gauge of the wire. In other respects, the method is quite similar to silk screen printing. 

The fines are classified out of the feed and pass through the air classifier into a baghouse, from which they are fed onto sieves, containing 165 p.m—0.124 mm (105—120 mesh) stainless steel wire cloth. Oversi2e mica from the sieves returns to the mill s grinding chamber for further grinding. 

FIGURE 4. Electrochemical reactor composed of a 2 cm3 capacity filter funnel and (A) stainless steel wire, (B, G) stainless steel needles for N2 entry and exit ports, (C) rubber septum, (D) lead foil cathode, (F) fine porosity glass filter, (H) plug of silicone glue and (I) silver wire anode. (Taken from Reference 176.)... 

Finely drawn stainless steel wire fibers have also been used for conductive filler. They are effective in low concentrations because of their high conductivity as well as their resilience in injection molding processes. They can provide EMI shielding... 

Recording activity directly from the muscle fibers themselves can be clinically valuable in identifying neuromuscular disorders [19]. Therefore, invasive electrodes are needed to access the muscle fibers or the neuromuscular junction. Fine-needle electrodes or thin stainless-steel wires are inserted or implanted to obtain local recording from the fibers or neuromuscular junctions [7]. 

The alternative preferred today is the candle filter shown in figure 5.4. The physical process is one of impingement but because the glass fibre is only one-hundredth of the diameter of the crimped stainless steel wire, the compressed glass fibre candle filters are able to remove the fine mist. They have proved to be relatively cheap, efficient and reliable. Their main disadvantage is pressure drop which can be up to 0.1 bar. For a 2000 tonne per day plant, the extra power consumption is around one megawatt. 

Since the major glycol loss is by entrainment, any design or operating action which reduces this item can result in a considerable improvement in plant economics. Neal et al. (1989) describe a case in which loss from a TEG contactor was reduced from about 9 Ib/MMscf to about 0.009 Ib/MMscf by replacing a standard 4-in.-thick mesh pad made of 0.01 l-in.-diame-ter 304 stainless steel wire with a density of 9 Ib/fl by a 6-in.-thick pad containing fine multifilament dacron thread knitted in with the wire and incorporating a draining feature. 

The recovery of acetic acid from its dilute aqueous solutions is a major problem in both petrochemical and fine chemical industries. Saha, et al. (2000) developed conventional methods of recovery of 30% acetic acid by reaction with n-butanol and isoamyl alcohol in a reactive distillation column using macroporous ion-exchange resin, Indion 30, as a catalyst bed, confined in stainless steel wire cages. They found that recovery of acetic acid was enhanced by reactive distillation compared to the batch operation. Hanika et al. (1999) studied the esterification butyl alcohol with acetic acid in a pilot plant using a reactive distillation column packed with commercial catalysts (KATPAK and CY). It was found that butyl acetate could be recovered in very high purity. This study had resulted in the development of a new technology for the manufacture of butylacetate. 

In 1975 there was a new development in the use of wire screens Sinclair and Hoopes (1975) described a diffusion battery (for measuring the particle size of aerosols) made of very fine 635-mesh stainless steel screen. An empirical equation was developed for the collection efficiency. This diffusion battery has become one of the standard techniques in aerosol measurements. Later, Sinclair et al (1978) described a screen diffusion battery configuration suited for measuring the activity - weighted size distribution of radon daughter aerosols. 

Exhaust gas temperature measurements are made with a fine-wire R-type thermocouple connected to an Omega model 660 digital readout. Gas samples are extracted using a 6.4-millimeter (0.25-inch) O.D. water-cooled stainless-steel suction probe and then filtered, dried, and analyzed for CO, CO2, O2, UHC, and NOj . Instrumentation includes a Beckman model 864 NDIR CO2 analyzer, Beckman model 867 NDIR CO analyzer, Siemens OXYMAT 5E paramagnetic O2 analyzer, Siemens FIDAMAT 5E-E FID total hydrocarbon analyzer, and a Beckman model 955 Chemiluminescent NO/NOj, analyzer. Certified span gases are used for instrument calibration. PC-based data acquisition is available during experimentation. All of the emissions data reported here were obtained approximately 24 pipe diameters downstream of the fuel injector and represent average exhaust concentrations. 

Pads of fine wire mesh induce coalescence of impinging droplets into larger ones, which then separate freely from the gas phase. Tower packings function similarly but are less effective and more difficult to install. The pads are made of metal wires or plastic strands or fiber glass. These data apply to stainless steel construction ... 

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