58 BULLETIN 3438, U. S. DEPARTMENT OF AGRICULTURE. | 
. 
TaBLE 2.—Furnish to beater on basis of 1,000 pounds of paper. Commercial tests on 
experimental pulps. 
Stock Soluble | Rhodamine 
No: Kind of ground wood. Weight. | Sulphite.| Size. | Alum. plueA| ablesaak 
Pounds. | Pounds. |Pounds.|Pounds.| Ounces. Ounces. 
LEIS PEUCO jae see oe ee eee See 750 250 3.33 6. 67 3.2 0. 167 
2uaNestermibemilock 22 2 32) 750 250 3.33 6. 67 4.27 10 
241 RS 1 07 ES) 0) a (6. a ne a 750 250 3.33 6. 67 3. 37 . 167 
4 | Lodgepole pine (Montana)..........- 750 250 3.33 6. 67 3.33 . 20 
5 | Western yellow pine..-.............- 750 250 3.33 6. 67 4.27 . 267 
Gale alsamunn one oe Sa (oe eg ees 750 250 3. 33 6. 67 2.53 - 167 
7 forme pine (California).......... 750 250,12 3933.4. 6 6.68 3.2 . 167 
SuEUC Lins Soe aa 2 ee oe poe Pee 750 250 S38 6. 67 3.73 . 133 
9 PeoRInCE BH OESPEUCR Set a eta wee 1750 250 3.33 6. 67 3. 73 - 20 
10) | eBalsamtand Sprucese a. a-6 5 see oe 1750 250 3.33 6. 67 2.6 - 167 
i amaraGk: Ss S4. = ee ee ae Mae oe 750 250 3-00 6. 67 5.33 . 667 
12 | Tamarack and spruce: o. =. 2-2 5.-.-=- 1750 250 3. 33 6. 67 4.00 -4 
ES a ENO DIGITS ayaa oar ee i Co ase 800 200 3500.1 1020 5.4 . 40 
CB Py My op a yays ot pe ee a Fe 2 800 200 3.33 | 10-0 4.4 - 40 
DSc WW Ge irs 2 be Re Senge he 800 200 3.331) 10:0 6.8 -30 
16 | Engelmann spruce (Colorado). .-..._- 800 200 3.33 | 10.0 4.8 .379 
12.) Armes ihistirs 2 ein eee eae eae 800 200 3.33 | 10.0 5.0 - 400 
1375 pounds each. 
The remainder of the 12 tests were run on a Fourdrinier machine 
trimming 100 inches and provided with a suction couch roll. The 
operation of pulp on this machine was much more satisfactory than 
on the other, although slowness of the stock made it impossible to use 
the dandy and a good formation could not be secured. Both of the 
paper machines ran at a speed of 460 feet per minute, and the screen 
plates were cut with slots 0.011 inch wide. In calendering the paper, 
9 nips of a 12-roll calender stack were used. 
So far as appearance and strength went, all the sheets manufac- 
tured at this time were considered very creditable. The No. 9 paper, 
containing 373 per cent of hemlock ground wood, 374 per cent of 
spruce ground wood, and 25 per cent of quick-cook hemlock sulphite, 
had a very high strength and took an excellent finish, though the 
color was slightly off. Both of the balsam sheets—No. 6 and No. 
10—were very good both in strength and color. The western yellow- 
pine sheet ran very foamy and showed a number of scum spots, due 
largely to the pitch. Sheets of better formation undoubtedly could 
have been made if the pulp had been ground in a way to make it some- 
what more “free.’”’ The jordan machine was not used except to 
brush out the sulphite. 
For the last 5 of the 17 commercial runs it was necessary to return to 
the first paper machine. In this series the paper was run at a speed of 
450 feet per minute and passed through 11 nips of a 12-roll calender 
stack. All of the stocks were somewhat slow, but not so slow as were 
those of the previous series. The formation of the sheets, however, — 
left much to be desired. Engelmann spruce (stock 16) and Alpine fir 
(stock 14) operated very satisfactorily with the dandy in use, but 
the stock from amabilis fir (stock 17) was very slow and sticky, and — 
the i was removed for noble fir (stock 13) and white fir (stock, 
i 
Pints 2. 
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