device for determining the tensile stresses in the strip road.

摘要

An apparatus for measuring the tensile stress of a continuously moving gas and liquid impermeable web of material, including a pair of spaced apart rollers disposed below the web for deflecting the web of material; an elongated enclosed channel disposed between the rollers below the web having an axial length which is at least as great as the width of the web and an opening disposed therebeneath; a plurality of orifices disposed in the channel coupled to means for supplying a gas under constant pressure thereto for forming a static pressure cushion between the web and the channel; and measuring means disposed in the channel for measuring the pressure therein. The improvement of the invention comprises a plurality of triangular shaped chambers which are axially disposed in series in the channel. Each of the chambers includes a partition member disposed parallel to the direction of movement of the web which forms at least one wall of each of the triangular shaped chambers. Selected ones of the chambers disposed at the outermost axial ends of the channel are provided with additional orifices communicative with the channel and coupled to means for controlling the supply of gas thereto from the channel, for compensating for gas losses at the lateral edges of the web.