3132 



Chapter 25 



Table 25-15. — Strength and yield of bleached NSSC pulps from four southern hard- 

 woods sampled on the Arkansas Delta (McGovern and Auchter 1976)' 



Yield 



Breaking 

 Species Burst Tear length 



Pointsllh glib Meters 



per ream per ream 



Ash, green 0.25 0.61 1,400 



Elm, American .30 .78 1 ,550 



Pecan, bitter^ .24 .62 1 ,200 



Sugarberry .45 .82 2,400 



'Data from U.S. Forest Products Laboratory Report No. 1292, dated April 1942. 



■^Percent of ovendry weight of wood 



-^Water hickory {Carya aquatica (Michx. f.) Nutt.) 



Percent^ 



75 

 80 



75 

 75 



Table 25- 1 6 . — Freeness, strength , and yield of bleached and unbleached NSSC and kraft 

 pulps made from mixed southern oaks' (McGovern and Auchter 1976)^ 



Pulp process 

 and bleach 



Freeness- 



Burst Tear 



factor factor 



Tensile 

 strength 



Sheet 

 density 



'Sixty percent red oak sp. and 40 percent white oak sp. 

 ^Data from Chesley (1959) 

 ^Canadian Standard 

 '^Neutral sulfite semichemical 



NON-SULFUR SEMICHEMICAL PULPING 



Lowe et al. (1969) described a proprietary non-sulfur semichemical process 

 that has been applied commercially in two mills pulping northern hardwood 

 mixtures. If the process proves economically advantageous, it could probably be 

 applied to southern hardwoods. 



