Optimised surface for freezing cylinder

Abstract

A through-flow freezing cylinder is disclosed comprising on its outer surface a set of substantially parallel tangential cooling fins and a set of substantially parallel grooves intersecting the set of cooling fins, preferably at a right angle.

1 . A through-flow freezing cylinder comprising on its outer surface:
 a set of substantially parallel tangential cooling fins; and   a set of substantially parallel grooves intersecting the set of cooling fins.   
     
     
         2 . A through-flow freezing cylinder according to  claim 1 , wherein the grooves intersect the cooling fins at an angle of more than 30°, preferably at an angle of more than 60°, most preferably at a substantially right angle. 
     
     
         3 . A through-flow freezing cylinder according to  claim 1 , wherein the cooling fins and the grooves are oriented tangentially and axially, respectively, in relation to the freezing cylinder. 
     
     
         4 . A through-flow freezing cylinder according to  claim 1 , wherein the cooling fins have a substantially triangular cross-sectional shape. 
     
     
         5 . A through-flow freezing cylinder according to  claim 1 , wherein the maximum height of the cooling fins is between 0.5 mm and 10 mm, preferably between 1 mm and 5 mm, most preferably between 2.5 mm and 3.5 mm. 
     
     
         6 . A through-flow freezing cylinder according to  claim 1 , wherein the mutual distance between the centrelines of two neighbouring cooling fins is between 0.5 mm and 10 mm, preferably between 1 mm and 5 mm, most preferably between 2.5 mm and 3.5 mm. 
     
     
         7 . A through-flow freezing cylinder according to  claim 1 , wherein the maximum width of the cooling fins is between 0.5 mm and 10 mm, preferably between 1 mm and 5 mm, most preferably between 2.5 mm and 3.5 mm. 
     
     
         8 . A through-flow freezing cylinder according to  claim 1 , wherein the mutual distance and the maximum width of the cooling fins are substantially the same. 
     
     
         9 . A through-flow freezing cylinder according to  claim 1 , wherein the grooves have a substantially rectangular cross-sectional shape. 
     
     
         10 . A through-flow freezing cylinder according to  claim 1 , wherein the mutual distance between two neighbouring grooves is between 1 mm and 12 mm, preferably between 2 mm and 10 mm, most preferably between 5 mm and 7 mm. 
     
     
         11 . A through-flow freezing cylinder according to  claim 1 , wherein the maximum width of the grooves is between 0.2 mm and 4 mm, preferably between 0.5 mm and 2 mm, most preferably between 0.8 mm and 1.2 mm. 
     
     
         12 . A through-flow freezing cylinder according to  claim 1 , wherein the maximum depth of the grooves is between 0.2 mm and 6 mm, preferably between 0.5 mm and 6 mm, most preferably between 2 mm and 3 mm. 
     
     
         13 . A through-flow freezing cylinder according to  claim 1 , wherein the grooves are machined. 
     
     
         14 . A through-flow freezing cylinder according to  claim 1 , which is made from nickel, brass, stainless steel or black steel.