3008 



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I 



Chapter 24 



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i. 



■* 



.*f*-Ht/-'-T1, ■'';• Ti., 



Figure 24-45. — Flakeboard of southern hardwoods pressed with a smooth caul (left) 

 and a screen caul (right). (Photo from files of E. Price.) 



Table 24-24. — Static friction coefficients between shoe soles of three types and wet and 



dry unsanded southern pine CDX plywood' compared to that for wet and dry flakeboard 



sheathing made of randomly oriented flakes of mixed southern hardwoods^-^ 



Shoe sole Flakeboard 



material Smooth Fine screen Coarse screen Plywood 



Friction coefficient - 



DRY 



Leather 0.527 0.546 0.498 0.558 



Neoprene .566 .901 .91 1 .796 



Crepe .733 1.129 1.218 1.029 



Average .622 .859 .876 .791 



WET 



Leather .994 .920 .907 .968 



Neoprene .547 .560 .544 .576 



Crepe .901 .889 .938 .916 



Average .781 .789 .793 .820 



'Perpendicular to grain of face ply. 



^Face flakes 3 inches long and 0.015 inch thick fabricated according to optimum procedure of Hse 

 et al. (1975). 



^Data from Final Report FS-SO-3201-52, dated April 8, 1982. U.S. Dep. Agric, For. Serv., 

 South. For. Exp. Stn., Pineville, La. 



