C—3a.

Table 18.—Laboratory Semi-chemical Cook No. 2220: Pulp-strentgh developed by Rod Mill.

Table 19.—Physical Tests of North American Newsprint Papers.

42

Weight : Armarent, Furnish Folding Endurance: Tensile Strength: Stretch: Colour per Ream , urmsn. : Machine Direction. Machine Direction. Machine Direction. Mills grouped by Regions. (24in. by Thickness. nZTZTT strength! stacJ$h. 1 j™ ~ i H _50oj per point. Sulphite. WO Q(j I In. Across. Average. J In. Across. Average. In. Across. Average. Red. Green. Blue. White. C P en r t. Cent. K" " of Double Folds. Breaking-length l! Metres. *« *« Per General average .. 32 0-0036 8-9 26 80 0-28 0-74 6-3 1-5 3-9 4,020 1,930 2,980 1-85 2-06 1-95 67 62 59 59 U.S.A. average .. 33 0-0037 8-9 j 27 79 0-28 0-74 5-8 1-4 3-6 4,101 2,040 3,020 1-57 1-89 1-73 67 61 57 57 East U.S.A. average .. 33 0-0037 8-9 25 82 0-27 0-72 5-1 1-5 3-3 3,960 2,040 3,000 1-36 1-59 1-48 68 63 60 60 East Mills No. 1 .. 32 0-0037 8-6 25 83 0-26 0-65 2-8 0-6 1-7 4,000 1,380 2,690 2-12 2-20 2-16 2 ..33 0-0034 9-7 25 83 0-28 0-67 3-8 1-0 2-4 3,870 2,530 3,200 2-32 2-92 2-62 71 63 59 59 3 ..34 0-0039 8-7 19 86 0-25 0-71 4-6 1-4 3-0 4,030 1,710 2,870 2-04 2-56 2-30 67 61 58 58 4 ..33 0-0039 8-5 29 75 0-29 0-82 6-6 1-6 4-1 4,190 2,290 3,240 1-00 1-14 1-07 67 65 63 63 5 .. 32 0-0036 8-9 .. .. 0-30 0-81 12-8 2-6 7-7 4,150 1,690 2,920 0-82 0-94 0-88 69 63 60 60 6 .. 34 0-0037 9-2 .. .. 0-30 0-71 5-4 2-2 3-8 3,990 2,710 3,350 0-94 1-02 0-98 70 64 61 61 7 ..34 0-0040 8-5 22 87 0-23 0-73 3-2 1-6 2-4 3,610 1,730 2,670 0-78 1-06 0-92 68 64 60 60 8 .. 32 0-0037 8-6 29 79 0-27 0-69 2-0 1-0 1-5 3,850 2,230 3.040 0-86 0-88 0-87 65 61 61 ' West U.S.A. average .. 32 0-0037 8-6 32 71 0-28 0-77 7-6 1-1 4-4 4,150 2,040 3,090 2-13 2-69 2-41 63 56 52 52 West Mills No. 9 .. 33 0-0038 8-7 26 78 0-30 0-80 9-4 1-0 5-2 4,540 2,300 3,420 2-54 3-00 2-77 10 .. 31 0-0037 8-4 37 64 0-29 0-84 8-2 1-2 4-7 4,240 1,800 3,020 2-04 2-60 2-32 60 52 46 46 11 .. 33 0-0035 9-4 .. .. 0-26 0-68 5-2 1-2 3-2 3,660 2,020 2,840 1-80 2-48 2-14 65 59 57 57 ; | _J : Canadian average .. 32 0-0035 9-1 26 80 0-29 0-74 7-2 1-8 4-5 4,040 1,770 2,900 2-29 2-33 2-31 68 64 61 61 East Canadian average.. 31 0-0034 9-1 26 j 82 0-29 0-72 4-9 1-6 3-3 3,750 1,720 2,730 2-26 2-37 2-31 69 64 62 62 East Mills No. 12 .. 31 0-0029 10-7 .. .. 0-28 0-66 5-4 1-4 3-4 4,320 1,880 3,100 2-24 2-32 2-28 67 62 62 62 13 .. 32 0-0035 9-1 .. .. 0-32 0-72 7-8 1-6 4-7 3,970 1,770 2,870 2-24 2-28 2-26 66 63 61 61 14 .. 31 0-0037 8-4 .. .. 0-25 0-78 2-8 1-6 2-2 3,400 1,560 2,480 2-32 2-20 2-26 73 69 63 63 15 .. 31 0-0038 8-2 26 83 0-31 0-73 5-0 1-6 3-3 3,910 1,630 2,770 2-50 2-84 2-67 72 67 65 65 16 .. 31 0-0033 9-4 26 81 0-29 0-70 3-4 2-0 2-7 3,160 1,740 2,450 2-00 2-20 2-10 67 61 58 58 ' West Canadian average 33 0-0037 8-9 25 79 0-31 0-79 13-0 2-1 7-6 4,750 1,890 3,320 2-36 2-22 2-29 64 60 57 57 West Mills No. 17 .. 33 0-0040 8-3 25 79 0-27 0-86 13-0 2-2 7-6 4,280 1,720 3,000 2-20 2-08 2-14 18 .. 32 0-0034 9-4 j 25 78 0-34 0-71 13-0 2-0 7-5 5,220 2,060 3,640 2-52 2-36 ; 2-44 64 60 57 | 57 East U.S.A. and Canadian 32 0-0036 8*9 j 25 82 0-28 0-72 5-0 1-6 3-3 3,880 1,910 2,900 1-71 1-89 1-80 69 64 61 61 average i ! ! : West U.S.A. and Canadian 32 0-0037 8*6 28 75 0-29 0-78 9-8 1-5 5-6 4,390 1,980 3,180 2-22 2-50 2-36 63 57 53 53 average i i 1

Minutes in Bod Mill . . 30 45 60 75 90 105 120 135 150 Bursting-strength .. 0-02 0-25 0-36 | 046 0-55 ] 061 0-66 0-75 0-85 Folding-strength .. .. 2 3 2 1 26 49 69 87 195 Tearing-strength .. 0-63 i 0-77 0-93 I 0-96 1-18 1-29 . 1-14 1-38 1-44 I I | j I