Vacuum desiccators exhaustion


Profile dies can be flat plates or the streamline type. Flat plate dies are easy to build and iaexpensive but can have dead spots that cause hang-up, polymer degradation, and shutdowns for cleaning. Streamlined, chrome-plated dies are more expensive and compHcated to build but provide for higher rates and long mns. The land length choice represents a tradeoff long lands give better quaHty profile and shape retention but have high pressure drops that affect throughput. Land length to wall thickness ratios are typically 10 1. Drawdown can be used to compensate for die sweU but should not exceed 25% to minimize orientation. Sizing jigs vary ia complexity depending oa profile desiga water mist, fog, or air cooling can be used. The latter gives more precise sizing. Also, water immersion vacuum sizing can be used. Accurate, infinitely adjustable speed control is important to the takeoff end equipment to guarantee dimensional control of the profile.  [c.206]

ASME Code design pressure (or maximum allowable working pressure), psi pressure on outlet side of rupture disk, psia exit or back pressure, psia, stamped burst pressure perimeter of a cross section, ft or meters Initial high pressure, mmHg maximum initial pressure at which the combustible atmosphere exists, psig initial pressure of system, psia initial low pressure or vacuum, mmHg maximum explosion pressure, bar, or other consistent pressure units maximum pressure developed in an unvented vessel, bar (gauge) or psig Normal expected or maximum expected operating pressure, psia  [c.538]


See pages that mention the term Vacuum desiccators exhaustion : [c.116]    [c.215]    [c.366]   
Textbook on organic chemistry (1974) -- [ c.138 ]