C- -3a

39

Table 13. —Cooking Data and Yields of Sulphite Pulps cooked at the Great Western Paper Co. Mill, Ladysmith, Wisconsin.

Table 14.—Commercial Sulphite Pulping Trials at Ladysmith, Wisconsin: Pulp-strength Data. —Physical Properties of the Unbleached Sulphite Pulps cooked at the Great Western Paper Co. Mill, Ladysmith, Wisconsin.

Wniatiirc Acid-composition. Tot,# 1 Wot, T ° tal Conk s? Temperature w„fihtnf 0™n-dry Weight of SteamNj' Species of Wood. Oven drv and PreaBiire g ei feiied Weight of Pulp, consumpN0 ' ifasis TotalSO, Free S0 2 . combined ~ ™P- OgnjAy tion. Per Cent. Figure. I Per Cent. Per Cent. 1 Per Cent. lb. Per Cent. lb. lb. 1 Insignia pine .. 52-5 I 5-33 3-77 1-56 22,540 32-5 7,315 2 TawaNo. 1 .. 37-5 II 4-92 3-45 ! 1-47 22,660 31 1 7,050 24,832 3 TawaNo. 2 .. 37-5 III 4-93 3-46 j 1-47 20,075 34-7 6,905 4 TawaNo. 3 .. 37-5 IV ; 4-75 3-10 | 1-65 24,075 34-6 8,330 29,184 5 50 per cent. Insignia .. V 4-92 3-67 I 1-25 17,890 I 33-7 6,030 1 pine, 50 per cent. spruce III

Bursting-strength as determined Folding-endurance as determined Tearing-strength as determined by the Ball-mill Method (Points by the Ball-mill Method (Double by the Ball - mill Method, Cook Species per Pound per Ream). Folds). (Grammes per Pound per Ream). 20min. 40min. 60 min. 80min. 20min. j 40min. 60min. j 80min. 20min. 40min. OOmin. 80min. I 1 Insignia pine .. .. 0-52 0-66 0-73 0-64 14 61 158 154 1-30 1-40 1-36 1-39 2 TawaNo. 1 .. .. 0-29 0-42 0-51 0-52 1 4-5 11 31 0-50 0-74 0-81 0-93 3 TawaNo. 2 .. .. 0-25 0-41 0-53 0-58 1-75 5-5 I 11-5 20-5 0-83 0-98 1 05 MO 4 TawaNo. 3 .. .. 0-23 0-37 0-47 0-51 1-76 4 12 7 0-51 0-66 0-78 0-89 5 50 per cent. Insignia pine, 0-57 0-71 0-82 0-78 38 93 155 266 1-48 1-75 1-66 1-61 50 per cent, spruce J Colour as determined by • the Hess-Ives Tint-Tensile-strength as determined by the Stretch as determined by the ; photometer. „ . Ball-mill Method (Metres). Ball-mill Method (Per Cent.). j j — Cook , l N 0> Species. | Red. Green. | Blue. I I p e j. I por I >e - r 20min. i 40. min. 60 min. 80 min. 20min. 40min. GOmin. 80 min. r , nT . f r < OTlf Cent. _|_ J 1 Cent - I Cent - 1 White. 1 Insignispine .. .. 2,683 2,936 3,878 3,478 7-75 8-75 5-87 6-12 75 65 60 2 TawaNo. 1 .. .. 2,068 2,754 3,077 3,380 3-25 5-75 6 12 6-37 73 63 60 3 TawaNo. 2 .. .. 1,905 ! 2,760 3,082 3,316 2-62 5-0 6-37 5-12 71 62 57 4 TawaNo. 3 .. .. 2,033 2.661 3,032 2,788 3-87 4-75 5-62 4-62 69 62 58 5 50 per cent. Insignia pine, 2,970 3,210 3,970 ! 3,905 8 25 100 8-37 7-5 76 70 63 50 per cent, spruce | ; 1