Abstract: A method of controlling a tension levelling equipment for correcting residual distortions in an extension of strip including a series of input and output bridle roll means for rendering a tension upon the extension of strip extending between the input and output sides of a levelling mill station for smoothing out the distortions, and slipping clutch means connecting the bridle roll means with driving means allowing a slipping motion therebetween, which comprises the steps of measuring a current tension rendered upon the extension of strip at both the input and output sides of either of the input and output bridle roll means, and controlling the engaging torques of the slipping clutches in such a manner that a current slipping motion produced between the extension of strip and the bridle roll means may be nullified or eliminated according to the result of measurement of tensions, whereby it can remove all possible defects such as flaws and scratches in the surface of a strip product caused from the slipping mo

Abstract: A voltage non-linearity type resistor and a process for the preparation of a voltage non-linearity type resistor wherein pre-sintering is effected at a temperature of no lower than 700.degree. C. with a basic composition including X mole % of ZnO and (100-X) mole % of Fe.sub.2 O.sub.3 (wherein 40.ltoreq.X.ltoreq.60), and sintering is then effected with the resulting pre-sintered body to which at least one of V.sub.2 O.sub.5, Bi.sub.2 O.sub.3, MgO, Al.sub.2 O.sub.3, MoO.sub.3, Sb.sub.2 O.sub.3, SiO.sub.2, NiO, SrO.sub.2 and PbO is further added in a proportion of 0.01-40% by weight.

Abstract: Elongated hollow members or tubes frictionally engage the interior wall of a hollow corrugating roll or a hollow pressure roll of a single facer so as to minimize the elastic vibration thereof and thereby to minimize the noise developed and transmitted during the operation of the single facer. A plurality of such tubes of a given diameter are arranged circumferentially about the interior wall of the shell of a roll of a single facer in such manner that each of the tubes frictionally engages the interior wall and so that each of the tubes also engages the adjacent tubes on either side thereof, thereby providing an assembled structure in which the plurality of tubes resist the elastic deformation of the roll and the resultant elastic vibratiion and thereby reduce the noise level.

Abstract: The interior wall of a hollow corrugating roll or a hollow pressure roll of a single facer is frictionally engaged by a resilient member so as to minimize the elastic vibration thereof and thereby to minimize the noise developed and transmitted during operation of the single facer. The resilient member is positioned within the hollow interior of the roll and is arranged to press against the interior wall as a result of its resilience and thereby to reduce the elastic vibration of the roll and the noise transmitted. The resilient member may take various forms, such as a coiled helical spring, a coiled leaf spring, a plurality of tapered nested annular members engaging the interior wall of the roll, et cetera.

Abstract: A hollow pressure member is provided adjacent the lower corrugating roll of a single facer to apply pressure for effecting bonding of the corrugated web and the liner web. The pressure member is provided, in the area facing the lower corrugating roll, with an arcuate surface having a curvature equal to or exceeding that of a curve extending through the tips of the flutes of the corrugating roll. The pressure member is of circumferential length at least exceeding the distance between two adjacent flutes of the corrugating roll. In one form of the invention the pressure member is provided with a plurality of threaded openings extending from its hollow interior to the arcuate surface and threaded hollow plugs are received within these openings. Each plug includes an aperture for permitting communication between the hollow interior of the pressure member and the arcuate surface thereof.

Abstract: A single facer includes a pressure member adjacent the lower corrugating roll to apply pressure for effecting bonding of a corrugated web and a liner web, the liner web being adjacent the surface of the pressure member. The pressure member is provided, in the area facing the lower corrugating roll, with an arcuate surface having a curvature equal to or exceeding that of an arc extending through the tips of the flutes of the corrugating roll. The pressure member is of a circumferential length at least exceeding the distance between two adjacent flutes of the corrugating roll. In order to reduce the friction between the arcuate surface of the pressure member and the liner web passing thereover, a conveyor in the form of an endless belt is disposed with a portion thereof extending between the arcuate surface of the pressure member and the liner web.