Southern pine coefficients

Tables I, II, and III give volumetric swelling coefficients for southern pine sapwood for various potential reagents, catalysts, and solvents (JO). These coefficients were determined under two sets of conditions. Specimens from oven-dried southern pine sapwood blocks were measured and their volumes were determined. Ten specimens from this set were submerged in a solution and either treated at 120 °C and a pressure of 150 Ib/in. for 1 h, or they were soaked at 25 for 48 h.

Table II. Volumetric Swelling Coefficients (S) for Southern Pine Sapwood in Various Catalysts...

Typical coefficients of variation for clearwood, for graded kiln-dried Douglas fir, Hem-fir and Southern Pine, and for alternative materials is given in Table 10.2. The variability in properties increases on going from small clearwood specimens to commercially graded material. The poorer grades of timber display more variable... 

Figure 10.7. Bending strength of clearwood and timber, (a) Small clear green specimens of Pinus sylvestris (Sunley, 1968). Data approximates to a normal distribution with a coefficient of variation of 17.7%. Thus 1% of population fails before the stress reaches 26.1 MPa (44.4 — 2.33 X 7.86) and 5% fails below 31.5 MPa (44.4 - 1.645 x 7.86). (b) Variability in bending strength of kiln-dried southern pine of various grades (Doyle and Markwardt, 1966).

Stamm, A.J. Nelson, R.M. Comparison Between Measured and Theoretical Drying Diffusion Coefficients for Southern Pine. Forest Products Journal, 1961, 11(11) 536-543... 

Static coefficient of friction, 369, 370, 377 Polyethylene, 369 Pressure treated lumber, 369 Southern yellow pine, 369 Steady shear viscosity, 639 Steady shear, 640 Steady shearing conditions, 640 Steady-state viscosity, 640 Steam explosion, 77, 84, 96, 522 Corrosion of the equipment, 96 Stearic acid, 81 Stick-slip effect, 380, 658 Sticktion, 380... 

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