Method to measure porosity of through pore, blind pore and closed pore

摘要

The present invention relates to a method for measuring the porosity according to the pore shape of wood, and among the pore shapes of the porous body of wood according to an embodiment of the present invention, a through pore in which both ends of the pore are connected, one of the voids The method for measuring voids in wood in which blind pores with blocked surfaces and closed pores impregnated inside the porous body are formed is a method of sieving a circular specimen of a preset size and a mesh of a preset size. preparing wood flour; _Obtaining the apparent volume (V _{bulk_c ) of the circular specimen, and obtaining the actual volume (V true_c} ) without voids using a density analysis equipment (Gas pycnometer); _Obtaining the actual volume (V true_s ) of wood flour using a density analysis equipment; _{Calculatingthe total porosity (Φ total} ) of the target wood by using the apparent volume (V bulk_c ) and the actual volume (V _{true_s ) of the wood powder in the circular specimen using the following formula;Closed pores are considered for the actual volume (V true_c} ) of the circular specimen measured with a density analyzer (Gas pycnometer), and the porosity at this time is the porosity of the through pore (Φ _through ) and the blind Calculating using the following formula as the sum of the porosity (Φ _{blind) of the pores (blind pores);} (1) calculating the difference between equations and (2) calculating the porosity (Φ _closed ) of the closed pores; Next, impregnating the circular specimen in the Galwick solution and maintaining it in a vacuum chamber for 25 to 35 minutes to allow the Galwick solution to penetrate into the blind pores and through pores in the circular specimen; taking out the circular specimen from the vacuum chamber, installing it in a capillary flow porometer, and applying air pressure in the vertical direction to allow the Galwick solution in the through pore to escape; Calculate the weight difference between the weight before impregnation of the Galwick solution and the weight after applying air pressure to the circular specimen, and divide this by the specific gravity of the Galwick solution to calculate the blind pore volume (V _{blind pore volume} ), and this _{calculating the porosity (Φ blind} ) of the blind pore by dividing by the apparent volume (V _bulk-c ) of the blind pore using the formula below;_{Calculating the porosity (Φ through} ) of the through pore from the formula below; includes.