Glass Jets

Jets for continuous filament textile yam are typically 1 cm diameter gold—platinum ahoy stmctures with 20—500 holes of 50—200 p.m diameter. Tire yam jets are also 1 cm in diameter but typicahy use 1000—2000 holes to give the required balance of filament and yam denier. Staple fiber jets can have as many as 70,000 holes and can be made from a single dome of ahoy or from clusters of the smaller textile or tire yam jets. The precious metal ahoy is one of the few materials that can resist the harsh chemical environment of a rayon machine and yet be ductile enough to be perforated with precision. Glass jets have been used for filament production, and tantalum metal is a low cost but less durable alternative to gold—platinum. 

When the air is expelled, the dips p and p are closed and p opened to allow the hydrosulphite solution to pass into the burette B. When this is full the clip is closed again and the height of the solution adjusted, care being taken that the liquid fills the rubber tube and the glass jet. The stopper in the central neck of the Woulff s bottle is then carefully and rapidly replaced by that carrying the glass jet of the burette and the titration then carried out. 

The nature of the separators is most important the LKB with the Ryhage separator and the Finnigan with a sily-lated glass jet separator gave appropriate sensitivity. 

The TG-MS assembly consisted of a double-focusing DuPont 21-491 Mass spectrometer coupled through a single-stage glass jet separator to a DuPont 951 Thermal Gravimetric Analyzer which was attached to a DuPont 990 Thermal Analyzer Console. 

Glass jets are often used in chemical work and may be easily made as follows Heat the tube in the same manner as when bending and, after taking it out of... 

While this is heating, set up an apparatus as shown in Fig. 4. A is a 1 or 2 liter bottle fitted with a two-hole rubber stopper. 15 is a glass bend extending nearly to the bottom of A. This can be the exit tube used in Experiment 8. C is a right-angled bend. D is a dry 750 c.c. flask. jE is a glass jet. F is a pinch cock. G is an 8-inch test tube fitted with a one hole rubber stopper. H is a loop of copper wire. 

Cut the tubing that has been constricted at a point where one end tapers down to about 1 mm as shown in FIGURE 1.8. Fire-polish both ends, being especially careful not to close the small tip. Repeat the process with the other piece so as to make two soft glass jets. 

After pulling air through the solution for about 5 minutes, remove the aspirator hose, and turn off the aspirator. Remove the rubber stopper and tubes, and wash the glass jet both inside and out with distilled water, making certain that the washings go into the 250-mL Erlenmeyer flask. This solution designated vanadium species E is now ready for use in part F. 

E-glass jets with a diameter comparable to that of the 66.8% alumina jet can be melt spun at temperatures ranging from 1100 to 1480°C [11] where they have a viscosity between 6.1 and... 

Hollow fibers have a concentric s/c bicomponent structure with a solid sheath and a void- or air-filled core. Flame drawing from glass tubes yielded the earliest examples of hollow fibers. Commercial technology relies on introdudng air into the core of a molten glass jet, the fiber precursor, and dates to 1966 [47-48]. The simplest design is a laboratory bushing [55]. Three... 

M. Claeys With our GC/MS system we have 3 possibilities for interfacing for packed columns, we use a glass jet separator in the case of electron impact ionization and a direct glass line of 0.5 mm i.d. when chemical ionization is applied, whereas for capillary columns, we use a glass coated metal tube of 0.25 mm i.d. 

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