Vacuum sealing

Pressure and vacuum sealed product discharge valve... 

Units without an oil pump rely on once-through oiling for vacuum sealing. The oil usage is low for most units. 

When vacuum can form in the system due to condensing/ cooling hot vapor entering, the seal drum liquid volume and possibly the seal drum diameter/length must be adjusted to maintain a seal when/if the seal fluid is drawn up into the inlet piping. A vacuum seal leg should be provided on the inlet 1.2 times the expected equivalent vacuum height in order to maintain a seal. 

Figure 6. Vacuum mixer for lead paste 1, mixing compartment 2, fast-rotating mixing tools 3, material-deflecting plate 4, discharge opening 5, static, vacuum-sealed enclosure [21J.

Therrtial Sterilization of Pouches of Beef. Methodology for food thermoprocessing in cylindrical metal containers assured food sterility in flexible packages. Beef slices (1.25 cm thick) were steam cooked to an internal temperature of 72°C and vacuum sealed in pouches to give a fill of 120 g. These pouches of beef were processed in a standard retort with complete water circulation and a superimposed air pressure of 1.7 X 105 Pa. The retort schedule—a 40-minute cook at 118°C plus come-up time followed by a 30-minute cooling time—achieved a F0 (lethality value) of 6. 

Physical vapor deposition Electron-beam evaporation Electroplating Reactive ion etching Wet etching Molecular beam epitajty Chemical-mechanical polishing Rapid thermal processing Vacuum sealing... 

Warning Package integrity may be compromised when using coated elastomers, especially for vacuum-sealed or gas-flushed vials [11]. 

Several explosions occurred in vacuum-sealed samples kept at ambient temperature. Storage under air at —20°C, or as solutions up to 2 Mol appear safe. 

Corrosive thionyl chloride may destroy the rubber vacuum seals of a rotary evaporator. Thionyl chloride can also be removed by vacuum distillation. 

Vacuum seal cooling water enters blender, reacts with aluminum powder and sodium hydrosulfite, and initiates exothermic decomposition No—N2 atmosphere, confinement in blender R Both aluminum powder and sodium hydrosulfite are water reactive... 

Schematically, in its simplest version, the reactant X (to be transported) is placed at the end of a vacuum sealed tube together with a small quantity of the transporting agent Z. Inside the tube a temperature gradient must be maintained.

Barometric condenser systems can be a major source of contamination in plant effluents and can cause a particularly difficult problem by producing a high-volume, dilute waste stream [8]. Water reduction can be achieved by replacing barometric condensers with surface condensers. Vacuum pumps can replace steam jet eductors. Reboilers can be used instead of live steam reactor and floor washwater, surface runoff, scrubber effluents, and vacuum seal water can be reused. 

Figure 3. Schematic diagram of the LC/MS connection. 1, Ion source 2, stainless-steel tube 3, ball valve 4, high vacuum seal 5, LC column 6, GC inlet 7, window. Modified from ref. 3.

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