Twin auger

In several experiments, Miller studied the effects of using horizontal twin auger feed screws under partial vacuum (Alexanderwerk Inc., Horsham, Pennsylvania, model 50/75 compactor). The feed powder was vacuum deaerated just before roller compaction. The experimental design showed that the compactor s deaeration feed system significantly increased compaction output and minimized powder leakage when compacting very low density blends (<0.35 gcm ). ... 

Horizontal twin-auger extruder with cutter by Randal Sander. Borie builds an extrusion machine in Paris... 

An auger is a device that can be screwed into the ground to remove soil. The commonest types are the twin blade and the corkscrew (Figure 3.3). Both return disturbed soil to the surface. Augers are useful for pilot surveys of sites. The general procedure for using an auger is as follows ... 

Figure 3.3 Types of augers used for soil sampling (a) twin blade (b) corkscrew.

For extrusion of very wide, flat clay ribbons the twin-shaft auger extruder was reintroduced in 1994 in the field of structural clay products, whereas co-rotating screw-extruders are used since the late 1970s in advanced ceramic for the production of honeycombs. 

Around 1885 the original front auger was improved to today s twin-blade end auger, also known as the taper auger. 

Fig. 11 Green brick showing a S-shaped crack resulting from a twin-blade point auger...

The newly designed equipment involved a compactor fitted with two horizontal feed screws, which featured vacuum deaeration. Specifically, the roller compactor was equipped with a conical storage hopper containing a variable speed agitator. Bulk powder was fed directly from the top of the hopper to the top of twin horizontal auger feed screws, which directly transported the powder to the nip roll area (13). Top and side views of the design features are shown in Figure 17. ... 

For excitation routinely monochromatic x-ray sources are used, also in this work a twin-anode setup with a Mg Ka (1253.6 eV) and Al Ka (1486.3 eV) source is applied. Generally, the intensity of the electrons A (E) as a function of kinetic energy is measured however more often XPS spectra are plotted versus the BE. Other than the desired photoelectron peaks in a XPS spectrum, peaks originating form Auger decays are observed as a result of the mechanism introduced in the previous subsection. As a convention, photoelectron peaks are labeled according to the quanmm number of the level (see previous AES subsection) from which the electron originates [39, 81]. 

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