41

0— 3a,

Table 16.—Laboratory Semi-chemical Pulping Tests: Yields and Cooking Data.

Table 17.—Laboratory Sulphate, Soda, and Semi-chemical Pulping Tests: Pulp-strenght Data. By the Ball-mill Method.

6—C. 3a.

I III I : 1 I [ 1 • i I I I I I I I I Number of minutes in ball mill* .. .. .. 20 40 60 80 100 120 160 20 40 60 80 100 120 160 20 40 60 80 1 100 120 160 20 40 60 80 100 120 160 20 40 60 80 100 120 160 J I " I |_ I 1 I 1 I ! I I I 1 1 I I j I 1 I I Cook Points ™?Pmmd S npfuMm <9.1 in Folding Strength: Tearing Strength: Tensile Strength: Stretch • per Cent Material. Process. „ o nts per Pound per Ream U4 in. Number of Double Folds. Grammes per Pound per Ream. Breaking-length in Metres. fSchooner Temile Tester ) (Ashcroft Tester!) (Schopper Folding Tester.) (Elmendori Tearing Tester.) (Schopper Tensile Tester.) (Schopper lenslle lester.) Insignis pine .. Sulphate .. .. 2,221 .. 0-81 .. 0-81 .. 1-12I0-92 .. 95 . . 242 .. 990 672 .. 2-84 .. 2-32 .. 2-17 2-20 .. 3,545 .. 3,460 .. 5,160; .. 8-37 .. 11-12 .. 10-62 15-00 Insignis pine .. Sulphate .. .. 2,222 .. 0-85 .. 0-98 .. 1-09 1-109 .. 185 . . 373 . . 835 1.40y .. 2-69 .. 2-49 .. 2-21 2-30 .. 3,845 .. 4,335 .. 4,385 4,080 .. 9-37 .. 11-00 .. 13-50 15 62 Insignis pine .. Sulphate .. .. 2,232 .. 0-99 0-8-2 0-70. 0-50 102 68 103 39 1-46 1-31 1-20 0-94 4,535 4,330 3,585 3,0S0 7-75 6-37 8-00 5-38 .. Rimu (slabwcod) .. Sulphate .. .. 2,226 .. 0-76 .. 0-99 .. 1-22 0-97 .. 155 . . 590 . . 909 580 .. 3-65 .. 2-73 .. 2-49 2-19 .. 3,205 .. 4,105 .. 4,620 4,325 .. 8-37 .. 10-00 .. 11-37 11-12 Rimu (roundwood) . . Sulphate .. .. 2,227 .. 0-75 .. 1-10 .. 1-36 1-21 I .. 120 .. 935 . . 1,314 1,013 .. 4-08 .. 2-90 .. 2-98 2-51 .. 3,177 .. 4.797 .. 5,955 5,017 .. 8-00 .. 10-37 .. 10-67 13-00 Rimu .. .. Sulphate .. .. 2,231 .. 087 .. 1'07 .. 1-351-20 ... 263 . . 672 .. 1,084 771 .. 2-81 .. 2-51 .. 2-39 2-04 .. 3,408 .. 4,330 5.890 4,800 .. 7-62 .. 10-25 .. 11-50; 12-50 Rimu .. •• Sulphate .. .. : 2,239 .. 0-86 .. 1-16 .. 1-201-16 1 .. 180 . . 561 . . 723 504 .. 2-68 .. 2-39 .. 2-10 2-08 .. 4,155 5,275 .. 5,325 4,725 .. 8-50 .. 9-12 .. 9-62:10-62 Corsieanpine .. Sulphate .. .. 2,233 .. 0-74 .. 1-06 .. 1-221-03 .. 70 . . 373 . . 694 850 .. 2-35 .. 2-30 .. 2-24 1-93 .. 3,285 .. 4.430 .. 5,250 4,330 .. 7-62 .. 9-00 .. 12-50 16-75 Corsican pine .. Sulphate .. .. 2,234 .. 0-76 .. 1-08 .. 1-120-94 .. 84 .. 463 .. 395 507 .. 2-28 .. 2-20 .. 2-30 2-03 .. 3.300 .. 4.190 .. 4,100 4,195 .. 7-12 .. 11-12 .. 10-50 9-87 Corsican pine .. Sulphate .. .. 2.240 .. 0-80 .. 1-00 .. 0-95 0-74 .. 174 . . 196 . . 229 309 .. 1-98! .. 1-83 .. 1-72 1-42 .. 4,265 .. 4.190 .. 4,555 3,660 .. 7-75 .. 10-00 .. 8-12 10-25 Austrian pine .. Sulphate .. .. 2.235 .. 0-65 .. 0-92 .. 1-15 1-09 .. 50 . . 199 . . 568 837 . 1-92| . 2-11 .. 2-06 2-12 .. 3,090 .. 4,090 .. 5,145 4,085 .. 8-62 .. 8-75 .. 10-75 15-00 \ustrian pine .. Sulphate .. .. 2,236 .. 0-69 .. 0-93 .. 1-12 0-95 .. 55 . . 281 .. I 506 642 .. 1-88 .. 2-04 .. 1-90 1-86 .. 3,565 .. 4,550 .. 5,370 4,275 .. 7-00 .. 5-62 .. 11-37 13-75 European larch .. Sulphate .. .. 2,237 .. 0-74 .. 1-06 .. 1-05 1-01 .. 110 .. 343 .. 471 784 .. 2-57 .. 2-34 .. 2-40 2-31 .. 3.675 .. 4,160 .. 4,375 4.355 .. 6-37 .. 9-75 .. 12-25 12-50 European larch .. Sulphate .. .. 2,238 .. 0-82 .. 1-09 .. 1-07 1-01 .. 100 . . 520 . . 610 902 .. 2-94 .. 3-02 .. 2-72 2-60 .. 3,890 .. 4,515 .. 4,280 4.115 .. 7-50 .. 10-12 .. 14-00 14-00 Tawa .. •• Soda .. .. 2,241 0-51 0-50 0-40 0-30 6 6 8 8 1-68 1-66 1-53 1-29 3,450 3,315 3,500 2.320 5-12 4-62 3-37 2-50 Tawa .. •• i Sod" •• •• 2,242 0-45 0-60 0-65 0-54 3 9 17 16 0-85 0-95 0-94 0-80 3.023 3,452 3.548 3,617 .. .. .. 3-63 5-00 6-75 5-50 Tawa .. •• Soda ■■ •• 2,243 0-42 0-57 0-74 0-80 4 10 14 26 . . . 0-75 0-99 1-15 1-07 2.701 3,485 3,678 4,251 .. .. .. 3-00 5-00 4-75 6-25 Tawa .. Semi-Chemical .. 2,218 0-10 0-22 0-29 0-54 0-70 0-83 .. .. .. 2 6 19 54 . 0-61 0-64] 0-80 1-051 l-20j 1-19 .. 1.580,2.390 3,260 3,536 4,406 .. .. 7-50 5-97 4-05 4-38 7-63 .. Tawa .. •• I Semi-chemical .. 2,219 0-18 0-29 0-48 0-67 0-76 0-94 .. j .. 2 7 20 64! 165 . . 0-57 0-81 1-04 1-06 1-19, 1-17 .. 1,585 2,280 3,050 3,640 4,455 4,660 .. 1-75 3-00 4-75 5-75 6-12 9-62 .. * 4-3 per cent, consistency — 66 r.p.m. Tests made at65 per cent, humidity and 70° F.

r „ ti„, 0 Strength Data (Tested at 65 per Cent. Relative CooKing Data. Humidity and 72° F). Wood used. . Impregnating-liquor. Penetration. § Steam. Rod-mill Data. •£ ' | m \ nquor per s > "*1 c *0 i 1— 1001b. Bone- ts : SS ! .2 *0 ! Before Penetration. After Penetration. dry Chips. © 2 ® 1 , S26 * • £ SP edes - •§. — : — g 1 I ! S-i §° ill I « 1 1 3 1« 0 5 'S Coneentra- Concentra- 0 - 0 ® S § p3 1 i ! . 5 © Is ss g ® fc "3> £ tion. tion. £ H & c ■§ g ©w) . 6 j § ; * I. . "£ £ £ 2 ° -r . 5 eo W 1-1 . § ® -o 2 - 6 2 a « © OC II ■& a A I ® "a <?'!■ © ! I S 5 § I I il -ss r*B ■§ *=■' Is S i « f a a a 1 = « g I =0 § I § 2 8 a =?, 5 'I l® 8 2a|2&'5i 2 Is I SI* 'os g 1 1 I Is g c & 1 5 1 1 gggggg g g ? 1 1 r n -r u 8 sj r g i i 5 $ s 1927. lb. lb. Gal. 6™ e / Gal. / Min. *7 Deg. C. lb. lb. Min. 'Min. *« »« lb ' £f. 2' Tawa 1,2102,218 Aug. 9 129-4 100-0 62-4 910 16-5 66-0 71-6 8-9 120 100 100-133 7-9 3-7 160 92 30 150 83-20 10-3 90 53-3 76-0*f 15-5 13 0-18 0-47 I | Tawa 2,219 Aug. 11 120-0 99-5 60-6 118-5 13-3 54-4 108-5 10-7 90 100 100 11-4 2-0 170 125 30 120 81-40 6-7 210 145-6 115-011 8-8 92 0-80 4-306,705 36 0-89 i '' Tawa 2,220 Aug. 17 125-5 104-2 57-8 123-0 14-4 54-1 104-2 11-9 120 100 86-103 17-3 2-2 170 138 30 240 70-00 6-3 1 80 .. 54-7|| 3-9 44 0-81 4-936,197 331 1-21 6-0 8-0 lb./hr.f 35-0 3-7 9 0-26 1-022 505 6 1-07 6-0 8-0Ib./hr.Jj 32-0 2-5 10 0-31 1-262,955 70-82^ Tawa 2,247 Oct. 25 158-4 127-7 j 51-5 106-8 36-5 42-8; 94-8 29-7 60 100 102, 12-3 5-2 170 115 15 120 81-60 10-0 60 42*5i ** Tawa 2,248; Oct. 27 167-8 135-7 48-5 117-8 39-2 42-4 1 102-7 31-7 75 85 86-l24 ; 9-8 3-1 170 135 30 165 72-70 10-0' 180 121-4 69-0 5'7 56 0-80 2-826,105 900-80 L_J ! I ! ! * Expressed as Na2CC>3. t Continuous rod-mill run; once through the mill. J Continuous rod-mill run ; twice through the mill. § Complete test not made because of evident weakness of sheet. Brushed out in beater, and small amounts of size, alum, and clay added. | Alum added ; no size. *lf 20 per cent, sulphite, 10 per cent, clay, and 2 lb. alum added. Brushed in beater half hour. ** Used for newsprint run No. 41. No strength tests made on pulp.