| 摘要 |
PURPOSE:To sucure good cushioning performance even when dehumidification is out of service and to eliminate risk of warping by providing two mats which can be overlapped one over the other, and equipping No.1 mat with through- holes which penetrate in the direction of overlapping with No.2 mat and is not in communication with air chambers formed in the inside. CONSTITUTION:Two mats 1, 2 are provided and overlapped one over the other, and if No.2 mat 2 is located below No.1 mat 1 and air jetting holes 14 of the No.2 are situated at the oversurface, the air jets to the above through through- holes 15 formed in the No.1 mat, which gives a dehumidifying effect besides the effect of alternate expansion and contraction of air chambers 11, 12 provided in the first No.1 mat. If a separate non-drafty sheet is pinched between the two mats 1, 2 or the No.2 mat is upset, the air jetting to the above side can be stopped while the second No.2 mat is held in the expanded condition as it has been, to enable stopping the dehumidifying effect without impairing the cushioning characteristic, and further the use of these two types of mats being overlapped will eliminate risk of warping. Besides these features, the two mats 1, 2 can be manufactured through a simple process of high frequency welding. |
