Distribution channeling in connection with the headbox of a paper machine

Abstract

Distribution channeling for stock suspension, the distribution channeling being in connection with a headbox of a paper machine The distribution channeling is fed with a transverse input channel for stock suspension, such as with an inlet pipe, and which distribution channeling feeds stock suspension into an intermediate chamber and onwards from the intermediate chamber to the slice channel of a paper machine. The distribution channeling is formed from a number of modular pieces and is fitted to the headbox after the input channel. One or more distribution channels, such as a hole, for the stock suspension flowing through a modular piece are formed in the modular piece. The modular pieces are placed side by side such that an interspace forms between them, from which interspace diluting water can be fed into the distribution channel.

1 . Distribution channeling ( 4 ) for stock suspension, said distribution channeling being in connection with a headbox ( 1 ) of a paper machine, which distribution channeling is fed with a transverse input channel ( 9 ), such as with an inlet pipe, for stock suspension and which distribution channeling ( 4 ) feeds stock suspension into an intermediate chamber ( 5 ) and onwards from the intermediate chamber to the slice channel ( 5 ′) of a paper machine, characterized in that the distribution channeling ( 4 ) is distribution channeling formed from a number of modular pieces ( 2 ) and is fitted to the headbox after the input channel, and in that one or more distribution channels ( 3 ), such as a hole, for the stock suspension flowing through a modular piece are formed in the modular piece ( 2 ), and in that the modular pieces are placed side by side such that an interspace ( 15 ) forms between them, from which interspace diluting water can be fed into the distribution channel ( 3 ). 
     
     
         2 . Distribution channeling according to  claim 1 , characterized in that a modular piece ( 2 ) comprises a number of distribution channels ( 3 ) one above the other or side-by-side. 
     
     
         3 . Distribution channeling according to  claim 1 , characterized in that the modular pieces ( 2 ) are in contact with each other. 
     
     
         4 . Distribution channeling according to  claim 1 , characterized in that the modular pieces ( 2 ) are at a distance from each other. 
     
     
         5 . Distribution channeling according to  claim 1 , characterized in that the modular pieces comprise grooves ( 11 ′) and/or protrusions ( 11 ), with which the modular pieces are fixed to each other and/or to the headbox ( 1 ). 
     
     
         6 . Distribution channeling according to  claim 1 , characterized in that the frame ( 1 ′) of the headbox comprises protrusions and/or grooves ( 6 ) for fixing the modular pieces. 
     
     
         7 . Distribution channeling according to  claim 1 , characterized in that the diameter of the distribution channels is constant, or the diameter of them varies. 
     
     
         8 . Distribution channeling according to  claim 1 , characterized in that the distribution channels comprise one or more widenings and/or narrowings ( 3 ″). 
     
     
         9 . Distribution channeling according to  claim 1 , characterized in that an input hole/input holes ( 12 ) is/are formed in the modular pieces ( 2 ) for feeding diluting water into a distribution channel/distribution channels ( 3 ). 
     
     
         10 . Distribution channeling according to  claim 9 , characterized in that an input hole/input holes ( 12 ) is/are formed in the sides and/or edges of a modular piece ( 2 ). 
     
     
         11 . Distribution channeling according to  claim 1 , characterized in that a piece ( 7 , 7 ′), such as a perforated plate, comprising one or more holes is arranged in connection with the modular piece ( 2 ). 
     
     
         12 . Distribution channeling according to  claim 1 , characterized in that the modular piece is of the cassette type. 
     
     
         13 . Distribution channeling according to  claim 1 , characterized in that the modular piece is, as viewed from its end, rectangular or of parallelogram shape or trapezoidal. 
     
     
         14 . Distribution channeling according to  claim 1 , characterized in that the modular pieces are arranged in the headbox one or more side by side or one above the other. 
     
     
         15 . Distribution channeling according to  claim 1 , characterized in that the modular piece is of plastic, such as e.g. PE plastic or HDPE plastic. 
     
     
         16 . Distribution channeling according to  claim 1 , characterized in that the modular piece is of steel, such as stainless RST steel, or of ceramic material, or of composite material. 
     
     
         17 . Distribution channeling according to  claim 1 , characterized in that the cross-sectional area of flow of an input channel ( 9 ) widens or remains constant in the transverse direction of the headbox.