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USE OF KAPOK PULP TO IMPROVE PROPERTIES OF RECYCLED PAPER 244 The Journal of the Royal Institute of Thailand Vol. 37 No. 1 Jan.-Mar. 2012 Porosity and air resistance Figure 4 The Effects of Recycling Cycles, Kapok Pulp and Softwood (SW) Pulp on Density (Note: Kapok and SW pulps have density values of 0.525 g/m 3 and 0.627 g/m 3 , respectively) Figure 5 The Effects of Recycling Cycles, Kapok Pulp and Softwood (SW) Pulp on Air resistance (Note: Kapok and SW pulps have air resistance values of 38.2 s and 24.4 s, respectively)