Abstract: The present invention relates to flexible pipes with metal armors and metal tubes having a sheath made of an extrudable thermoplastic material for manufacturing an acid gas tight barrier.The sheath comprises a determined proportion of at least one charge of a product chemically active with acid gases so as to irreversibly annihilate the corrosive effects of these gases, the proportion being determined as a function of the gas permeability of the thermoplastic material.

Abstract: A continuously wound strip of toweling, either solid wound or wound about a hollow central core, forms the roll with radial end surfaces. A pair of diametrically aligned, axial pin openings are formed in one of the roll end surfaces equally radially spaced from the central longitudinal axis with radially inner extremities radially outwardly of any roll core. If the roll is solid wound, a central axial opening is formed in the other roll end surface preferably semi-spherical in shape or if the roll is hollow core wound, the core forms the central axial opening at the other roll end surface. In either case, with dispenser pin support and central support at the opposite roll ends, dispensing unwinding of the strip of toweling to the pin hole radially inner extremities releases the roll for endwise pivoting about the other roll end automatically dismounting the same.

Abstract: A rotatable first roll end holder has diametrically opposed pins radially surrounded and projecting axially from radial surfaces except at pin inner radial extremities where a recess extends radially between the pins and opens axially toward the roll to be supported. The recess preferably also opens radially at opposite sides of the first holder. A second roll end holder may consist of merely a central projection so that a roll of toweling may be supported between said holders by simultaneous axially engagement of the pins and central projection. When sufficient toweling is dispensed from the roll to the pin inner radial extremities, the roll is released radially by the pins and pivots about the second holder projection through the first holder recess for ultimate complete disengagement from the holder.

Abstract: A supply web of relatively smooth paper toweling is mounted on a dispenser and is directed between rotatable dispensing rolls which have interengaging generally triangular teeth. The dispensing rolls are resiliently urged together with the paper toweling web therebetween and during roll rotation, the teeth compressively abut and foldably deform the relatively smooth paper web into a crimped paper web without appreciable permanent thickness deformation. During the crimping of the paper web by the dispensing rolls and without regard to roll rotation, the paper web is at all times securely retained by the rolls so that after the dispensing of a desired length of the crimped paper web, the web may be cut along a dispenser cutting bar during such roll retention.