SUITABILITY OF LONGLEAF PINE FOR PAPER PULP. 13 



TABLE 3. Record of semicommercial tests using the soda process Continued. 



(P. L. 138, S. L. 176; P. L. 164-1.) 



1 Five pounds of sodium chloride (table salt) per 100 pounds of chips were used in addition to the chemicals 

 indicated. However, it will be shown later that sodium chloride has little or no effect. (See p. 19.) 



2 Shipment L-3a from Mississippi was used as the test material. Data for these three cooks have been 

 published previously in Forest Service unnumbered bulletin, "Paper Pulps from Various Forest Woods," 

 by Henry E . Surface, 1912. Specimens of natural color and bleached pulps accompanied the data. 



Cook 150 afforded a yield of 52 per cent, or 1,846 pounds per solid 

 cord, but the quality was not so good as in the case of cook 152, the 

 paper being quite weak (strength factor 0.56) with a correspondingly 

 low resistance to wear. The papers resulting from cooks 144, 149, 

 and 151 were all of very good quality, having high strength ratios 

 and good wearing properties, but the yields were considerably lower 

 than for cook 152. 



Soda pulps from longleaf pine tend to be soft and fluffy, even when 

 slightly undercooked, or chippy. Proper beater treatments will 

 remedy this to some extent, but the pulp does not become so well 

 hydrated nor attain the same smooth, greasy feel during beating as 

 the sulphate pulps, and the resultant papers do not show the 

 parchmentized effect so characteristic of the sulphate papers. On 

 the paper machine soda stock runs "free," while sulphate stock runs 

 "slow," provided, of course, both kinds of stock are handled simi- 

 larly in the beater. 



