Virgin filament

Filament, virgin An individual filament, which has not been in contact with any other fiber or any other hard material. 

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The results obtained using field emission microscopy have shown the existence of three different chemisorbed states for CO adsorbed on tungsten. A low temperature virgin adsorption, stable to about 200°K has been reported, the dipole moment of which is unaffected by structural effects on the surface. Two other states that can be related to the a and j8 phases observed in flash-filament studies have also been detected using FEM Gomer and co-workers also reported evidence to suggest the existence of some /3- and a-phase trapped into the virgin layer at low temperatures. 

Figure 7.2 Tensile strength of virgin glass filaments as function of temperature. Adapted from Ref. [6].

An extruder can also be used to compound materials by mixing two or more components together. It can also blend virgin with regrind stock and, in fact, is the machine used to form long filaments that, when chopped up, are the pellets used to injection mold or extrude special shapes. 

If a filament or rod of a virgin (stress-free) material is stretched at a constant extension rate, the total stress component ajj, initially zero, will increase with time in a manner which depends on the nature of the polymer. It is then possible to define a tensile stress growth coefficient ... 

The strength refers to that of virgin filaments. Handling the filaments may reduce the strength noticeably. The specific heat measurements for S-2 glass refer to bulk material. 

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