44 



FOREST PRODUCTS 



After washing, the pulp is pumped into the feed tank where it is mixed 

 with a surplus of water so that the fibers are suspended individually. It 

 is then pumped from this tank to the first hne of screens. Here the best 

 part of the pulp passes through the screens and is carried away by the 

 water and goes out onto the press machines where it is collected. 



There are several styles of screens employed for screening the pulp but 

 these are usually used for special purposes and in mills in which the 

 pulp is made directly into a certain kind of paper. 



Collection of Pulp on Lap or Press Machine. 



From the screens, the pulp passes out and into a tank which is equipped 

 with a revolving cylindrical screen. As the screen revolves, the water 



Photograph iy U . S. Forest Serctce. 



Fig. 7. — Wet machine or press — the iinal step in the manufacture of paper pulp. The sheets 

 are stacked up as shown on the extreme right and then pressed and baled for shipment 

 to the paper mill. 



passes through the meshes and outlet, leaving the pulp adhering to the 

 mesh. The screen revolves, carrying the pulp upward and it is removed 

 by a felt which is carried over a set of rolls where the. pulp is deposited 

 on a large wooden roll. This pulp is cut off from time to time, as it be- 

 comes thick and is folded up into bundles for shipment or use directly 



