Wood-based boards were exposed to an outdoor environment at angles of 90[degrees] and 45[degrees] to the ground surface in order to investigate the effect of exposure angle on board properties.
The deteriorating effects of solar radiation and rainwater are likely to depend on the exposure angle.
At the same time, the direction and angle used for the outdoor exposure testing of the properties of polymers are prescribed in Japanese Industrial Standards (JIS) Z 2381 (JIS 2001; 45[degrees] or 30[degrees] exposure angle), JIS K 7081 (JIS 1993; 30[degrees] exposure angle in Japan, latitude--10[degrees] in middle latitude area), JIS K 7219 (JIS 1998; 30[degrees] exposure angle), and JIS K 5600-7-6 (JIS 2002; 45[degrees] exposure angle).
The exposure angle caused little difference in deterioration in both types of MDF (having different binders).
The effects of exposure angle on the deterioration of board properties depended on the type of board.
Results show comparative effects of three weathering variables: moisture, exposure angle, and exposure location.
The study objectives included obtaining information which compared the effects of moisture to two other weathering factors: exposure location and exposure angle.
This DOE included eight long-term weathering exposures varying the three factors (moisture, exposure angle, and location) simultaneously.
In this DOE, the design achieved control over two factors without introducing artificial and unnatural environments: the exposure angle and exposure location factors.
In order to characterize the effect of exposure angle in this DOE, four of the eight trials exposed specimens on racks oriented 45[degrees] from the horizontal facing true south while four trials exposed specimens on racks oriented at 5[degrees] from the horizontal.
The statistical analysis showed significant effects for some finishes for exposure angle
and surface preparation, for example, finish 3 (Figs.
In addition, the tabletop design accommodates 11" x 14" and 14" x 17" film cassettes at the head, foot, and both sides, for a full range of exposure angles