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HCF pilot plant, capable of various sheet forming tests, was constructed in the Technical Research Institute of Hitachi Zosen Corp., at Sakurajima, Osaka. It was started up in Nov., 1985. Each group's technology which had been developed by small scale forming tests was confirmed by the individual tests. Then combined and consolidated tests were carried out. Resident researchers from RAPPT member companies devoted themselves to develop the printing and writing paper produced at high head box cosistency.Achievements are as follows : (1) The formation, printability and coating-capability in HCF test sheet proved to be as good as those of the conventional fine paper.(2) With increasing head box consistency, Z-direction strength (Scott internal bonding strength) increased, but tensile strength tended to decrease, and one pass retention, both of the fiber and filler, increased remarkably.(3) The solid content in the wet sheet was affected by the freeness of furnish but not by consistency.Required solution : From practical viewpoint of HCF, accurate lip opening is essential for good profile, since the lip opening is only 2 mm for 60 g/m2 at 3%.Expected application : In producing solid board, HCF is more profitable than multiplies forming, because additives such as starch need not be required for reinforcing the ply-adhesion.

Research and development of high consistency forming. (6). Sheet forming pilot plant test.