Abstract:
A composite abrasive filament, including at least one preformed core at least partially coated with a hardened, abrasive-filled thermoplastic elastomer, exhibits increased abrading life over previously known abrasive filaments. Also disclosed are methods of making such filaments and using such filaments in article form to abrade a variety of workpieces.
Abstract:
There is disclosed a flexible mandrel for making tubular products comprising an elastomeric portion surrounding a reinforcing cable comprised of wire cables twisted around a non-metallic core. There is also disclosed a process for making a flexible mandrel and a process of making a hose using the flexible mandrel.
Abstract:
A prestressing steel material for use with concrete that is prestressed by posttensioning is disclosed. Said steel material is unbonded from the concrete. The prestressing steel material is composed of a steel member sheathed with a foamed synthetic resin tube. The wall thickness of the synthetic resin tube is at least 300 microns, more preferably, more than 500 microns. In the case that the steel member is a strand composed of a plurality of twisted steel wires, the spiral grooves of the strand are first filled with a resin and the strand together with the resin sheathed with the foamed synthetic resin tube.
Abstract:
The vulcanized, aged, adhesion of rubber to brass-coated steel cord is improved by the use of benzotriazole (BTA) and cyclohexylamineborate (CHAB). The BTA and CHAB are used alone or in combination. They are added directly to the surface of the cord or to the rubber immediately adjacent to the cord. BTA treatment will reduce surface contamination of the cord. CHAB will aid in improving aged adhesion.
Abstract:
A composite glass fiber cable is disclosed having a negative linear coefficient of thermal expansion which is controllable by variation of the twist of helically plied glass roving to substantially zero change in length over a wide variation in environmental temperatures under varying load conditions.
Abstract:
A tendon suitable for posttensioning concrete and for use in other applications comprising a multiple-wire strand incased in a corrosion inhibitor in an amount sufficient to provide a circular enclosure greater than the outside diameter of the strand and having a seamless plastic jacket tightly covering said incased strand. A process of making said tendon which comprises the steps of coating and filling the interstices of a multiple-wire strand with a corrosion inhibitor, passing same through a circular die of a diameter greater than the strand to remove excess corrosion inhibitor and to form a circular enclosure of said inhibitor around said strand, and melt extruding a plastic jacket around said incased strand.