Pitch trouble prevention method

Abstract

There is provided an efficient pitch trouble prevention method in a papermaking step of paper production. The pitch trouble prevention method in a papermaking step of paper production includes: an aeration step of exposing at least one of white water and adjusted water to gas; and a pitch control agent addition step of adding a pitch control agent to at least one of the white water and the adjusted water.

1 . A pitch trouble prevention method in a papermaking step of paper production, comprising:
 an aeration step of exposing at least one of white water and adjusted water to gas; and   a pitch control agent addition step of adding a pitch control agent to at least one of the white water and the adjusted water.   
     
     
         2 . The pitch trouble prevention method according to  claim 1 , wherein the pitch control agent addition step is performed after the aeration step. 
     
     
         3 . The pitch trouble prevention method according to  claim 1 , wherein in the pitch control agent addition step, an amount of the pitch control agent to be added is 0.1 mg/L to 10,000 mg/L per kg of suspended solids. 
     
     
         4 . The pitch trouble prevention method according to  claim 1 , wherein in the aeration step, an aeration tank having a diffuser at a bottom is used, and an amount of aeration by the diffuser is 0.5 m 3 /h to 10 m 3 /h per m 2  of bottom area of the aeration tank. 
     
     
         5 . The pitch trouble prevention method according to  claim 1 , wherein in the aeration step, both the white water and the adjusted water are exposed to gas. 
     
     
         6 . The pitch trouble prevention method according to  claim 1 , wherein a time from the aeration to the addition of the pitch control agent is 0 to 30 minutes.