Pull-through

Drawing is a method of reducing the diameter of wire, rod, and tubing. It is similar to extmsion, except that the metal is pulled through the die instead of pushed through it, as shown in Figure 13i. 

Another preparation method is a sintering process where phosphate ore, sand, and coal are blended together and ignited on the grates of a sintering machine. Air is pulled through the blend, and the entire mass is allowed to bum. The resulting fused bed of material is then cmshed and screened to the appropriate size distribution, and the undersized material is reprocessed. 

Two-BIa.de Coaters. In order to coat both sides of a web simultaneously, two flexible blade coaters can be used back-to-back, ie, with both blades pressing against each other and the web between them. The web usually travels vertically upward. Different coatings can be appHed on each side of the web. The blades tend to be thinner and more flexible than the standard blades and the angle to the web is lower. The web has to have sufficient tensile strength to be pulled through the nip. 

Cha.in Wa.rp Dyeing. This procedure is widely used in the dyeing of indigo on warp yams which are in the form of ropes or chains. In this procedure, several warp ropes are pulled through a series of tubs containing the dye Hquor and gradually are dyed to the desired shade. 

C) Pull-through floating-heat-kettle-type rehoder having stationary head integral with tube sheet, 584-mm (23-in) port diameter and 940-mm (37-in) inside shed diameter with tubes 4.9-m (16-ft) long. SIZE 23/37-192 TYPE CKT. 

Type of Design U Tube Fixed Tubesheet Floating Head Outside Packed Floating Head Split Backing Ring Floating Head Pull-Through Bundle... 

Removable-Bundle, Pull-Through, Floating-Head Exchangers... 

In the pull-through, floating-head design, the floating-head cover is bolted directly to the floating tubesheet. This allows the bundle to be removed from the shell without removing the shell or floating-head covers, which eases inspection... 

These filters are similar in configuration to a Nutsche filter, but instead of one filter plate there is a series of plates inside the vessel. The filtrate is pulled through the filter media in the center of each plate to a central pipe that discharges out the bottom of the devise. The bottom plate of the filter usually discharges its filtrate thought a separate nozzle. These filters are usually used with slurries where a smaller quantity of solids is to be collected. 

Pultrusion is also used to make structural shapes from composite materials. The incoming material is generally unidirectional and must be pulled through the pultrusion die because the uncured composite material is entirely too flexible to push (as in extrusion processes). The incoming material can be preshaped by various guides and rollers as in Figure 1-18. 

Adverse conditions with up draft - the additional draft in the secondary flue causes excess air to be pulled through the diverter from the room. The baffle plate prevents the draft in the primary flue from being affected. 

In the roll-to-roll configuration the substrate consists of a continuous roll, e.g. stainless steel [154], Sn02 F-coated aluminum [155], or plastic [156-158], which is pulled through a sequence of deposition chambers. 

All fortified (spiked) matrix samples are prepared in the laboratory at the same concentration. Laboratory spikes are immediately put into cold storage. Trip and fleld spikes are kept cold and sent to the fleld. The trip spikes will accompany sample shipments. The fleld spikes are stored and transported in the same manner as the trip spikes. When practical, air should be pulled through fleld spikes in the same manner as actual fleld samples being taken at the time of the study. 

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