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Chapter 23 



A forming machine which filters the furnish from the fiber-air-suspension is 

 illustrated in figure 23-58. The metered furnish is supplied to one or more 

 positively pressured vertical chutes (felting heads) suspended above a moving 

 screen. Rotating brushes inside the head agitate the furnish and discharge an air- 

 furnish stream through its perforated bottom. The stream is drawn by vacuum 

 through the traveling screen, which filters out the furnish and builds up the mat. 

 This vacuum-type forming machine is used by the Weyerhaeuser Company in 

 the dry-process siding plant at Klamath Falls, Ore. (Fig. 23-59). 



PERFORATED 

 PLATE 



Figure 23-58. — Vacuum forming machine. (Drawing after Robinson 1959.) 



