Abstract: An apparatus and method for making electrical resistance measurements of individual powered electrodes within a glass heating furnace is disclosed. The powered electrodes are energized in pairs with electrical power supplied at a relatively low frequency, causing electrical currents flow between the pairs of powered electrodes through a pool of molten glass so as to generate heat therein. A single reference electrode is also provided within the furnace. Each of the powered electrodes is sequentially paired with the reference electrode to permit voltage and current measurements to be made. To accomplish such measurements, a relatively small high frequency electrical signal is supplied to the powered electrode, in addition to the relatively low frequency heating power supplied thereto. As a result, a measurement current flows between the selected powered electrode and the reference electrode.

Abstract: A refractory metal substrate suitable for use in contact with an oxygen- or nitrogen-containing environment at a temperature greater than the oxidation or mitridation acceleration temperature of the substrate is disclosed. The refractory metal substrate comprises a refractory metal comprised of molybdenum and having a coating comprised of chromium metal. In an alternative embodiment the refractory metal can be an alloy comprised of in weight percent: from about 10 to about 20 chromium, from about 0 to about 5 alumina (Al.sub.2 O.sub.3), from about 0 to about 1 yttria (Y.sub.2 O.sub.3), from about 0 to about 0.5 titanium, from about 0 to about 0.1 zirconium, the balance being essentially molybdenum to make 100% of the composition; and, optionally having a coating of chromium metal.

Abstract: A method for manufacturing mineral fibers comprises forming mineral fibers from molten mineral material, continuously discharging an auxiliary stream of molten mineral material, continuously measuring the temperature and the mass flow rate of the auxiliary stream, calculating the viscosity of the material using the measured mass flow rate and modifying a process parameter in response to the measured temperature and calculated viscosity of the auxiliary stream.

Abstract: Apparatus for delivering fibrous insulation batts comprises an upstream batt receiving section and a downstream batt delivering station, the upstream batt receiving station being adapted for two modes of operation, the first mode being for folding batts and delivering folded batts to the downstream batt delivering station and the second mode for delivering unfolded batts to the downstream batt delivering station, the upstream batt receiving station comprising a conveyor belt for transporting batts through the upstream batt receiving station, a plurality of rolls for guiding the conveyor belt along a first path in the first mode of operation, means for moving at least one of the rolls to guide the conveyor belt along a second path for the second mode of operation, a support member spaced apart from the conveyor, thereby defining a gap between the conveyor belt in the first mode of operation and the support member, the support member being adapted to support a portion of the batt as it is transported off the do

Abstract: A glass fiber bulk strand roving that is made up of a multiplicity of strands, each of which is made up of a plurality of individual fibers, for example, 200 of such fibers. Each strand of the roving has a multiplicity of rather long, axially extending loops, for example, axially extending loops with a calculated length of at least 6 inches, and a multiplicity of shorter, unbroken, cross-axially extending loops that are formed in the axially extending loops of such strands. The axially extending loops and the cross-axially extending loops interengage and intertwine with one another to form a composite entangled structure. The roving of the present invention is made by a process that uses a finger wheel to form axially extending loops in strands and a spinner downstream of the finger wheel.

Abstract: A method for melting thermosplastic material is disclosed. A protective liner for the interior of the furnace protects the refractory walls of the furnace from corrosion caused by the molten thermoplastic material. The improvement comprises confining a thermoplastic material between the liner and the refractory walls which is a viscous material such that its characteristics closely match those of a refractory composition.

Abstract: According to this invention there is provided a method for producing glass mat using glass having a relatively high alkali content which comprises chopping the glass fibers while wet and thereafter freezing the wet fiber glass in order to prevent leaching of the alkali constituents. The frozen glass fiber can then be crushed and used to prepare a glass fiber mat in a wet process.

Abstract: A glass fiber bulk strand roving that is made up of a multiplicity of strands, each of which is made up of a plurality of individual fibers, for example, 200 of such fibers. Each strand of the roving has a multiplicity of rather long, axially extending loops, for example, axially extending loops with a calculated length of at least 6 inches, and a multiplicity of shorter, unbroken, cross-axially extending loops that are formed in the axially extending loops of such strands. The axially extending loops and the cross-axially extending loops interengage and intertwine with one another for form a composite entangled structure. The roving of the present invention is made by a process that uses a finger wheel to form axially extending loops in strands and a co-axial spinner with an inlet that is positioned above or below the finger wheel.

Abstract: A method and composite produced by depositing particulate material on a planular surface, contacting the surface and the particulate material with a gas-curable resin and curing the resin to adhere the particulate matter to the surface.

Abstract: A digitally controlled apparatus for varying the temperature of a glass fiber forming bushing over a period of time is disclosed. A clock generates timing pulses at a predetermined frequency to a BCD counter. The output signals from the BCD counter are fed to a comparator means. BCD output signals generated by a plurality of manually operable switch assemblies are also fed to the comparator means. The switch assemblies are set by an operator to generate a predetermined number related to the amount of time required to wind a strand of glass fibers upon a tube. The comparator means generates an output pulse when the count of the BCD counter equals the number set by the switch assemblies, then resets the BCD counter to zero. The output pulses from the comparator means are fed to a binary counter. The output lines from the binary counter are connected to a digital to analog converter. The converter generates an analog output signal which is proportional to the magnitude of the number from the binary counter.

Abstract: A coating composition substantially prevents fraying of glass fiber yarn packages. The composition is composed of an aqueous solution of a resin formed of the hydrolysis product of a copolymer of vinyl aromatic monomer and maleic anhydride, an organo silane glass fiber anchoring agent and an effective amount of a water-soluble pyrrolidone-containing polymer sufficient to form a protective film over the glass fiber.

Abstract: A double-wall tank having inner and outer walls bonded to connecting hollow annular ribs. Passageway means through the ribs enable leak-detecting liquid to fill the spaces between ribs, within ribs, and between end caps.

Abstract: A corrosion-resistant coating for a ferrous surface comprising an asphaltic matrix of an asphalt or a petroleum resin or a mixture thereof having a convertant dispersed therein. The convertant is either adsorbed at the ferrous surface or reacts chemically with the surface to prevent further oxidation. Preferably, the coating is sprayed onto the surface as a solution in a solvent, and the solution may also include a film-forming resin. Other optional coating ingredients include elastomers to improve low-temperature characteristics, and fillers or bulking agents.

Abstract: A bushing balance controller senses the temperature of each section of a multiple section glass fiber forming bushing by thermocouples or resistance (voltage drop) measuring techniques and injects electrical energy to all but one of the individual bushing sections and adjusts the supply of electrical energy to the entire bushing assembly thereby controlling the temperature of each individual section of the bushing. When thermocouples sensors are utilized, standard thermocouple driven temperature controllers may be utilized to provide a signal to a plurality of power packs, a primary power pack providing electrical energy to the entire bushing and smaller power packs controlling the injection of electrical energy to all but one of the bushing segments. A similar power pack and bushing control scheme accompanies the use of resistance (voltage drop) measurement techniques.

Abstract: The rib form comprises a cardboard blank folded into a trapezoidal shape and having overlapping opposite longitudinal edge portions of the blank glued together and forming the shorter of the two parallel sides of the trapezoidal shape. Peripheral slots evenly spaced along the rib form are cut through the longer of the parallel sides and through the two angular sides of the trapezoidal shape.

Abstract: A method and apparatus for preheating particulate glass batch comprises a rotatable drum for mixing batch with heat transfer media in a heat transfer relationship, means for directing the heated batch from the container to a glass melting furnace, means for venting gases and gas-borne particulate matter from the drum, means for separating a selected portion of the particulate matter from the vented gases, and means for directing the separated particulate matter into the glass melting furnace.

Abstract: An insulation product comprises the first and second film of reflective material and one or more layers of insulating material positioned between the outer films, the films having an emissivity less than about 0.2 and the insulating material having a density within the range of from about 0.01 to about 0.3 pcf.

Abstract: A method and apparatus for the manufacture of a glass fiber bulk strand roving which is made up of a multiplicity of strands, each of which is made up of a plurality of individual fibers, for example, 200 of such fibers. Each strand of the roving has a multiplicity of rather long, axially extending loops, for example, axially extending loops with a calculated length of at least 6 inches, and a multiplicity of shorter, unbroken, cross-axially extending loops that are formed in the axially extending loops of such strands. The axially extending loops and the cross-axially extending loops interengage and intertwine with one another to form a composite entangled structure. The roving which is produced by the method and apparatus of the present invention is made by a process that uses an array of inwardly projecting fingers to form axially extending loops in the strands and a spinner with an inlet that is positioned adjacent the fingers.

Abstract: An aqueous asphaltic emulsion wherein the asphaltic component is either a chemically-modified asphalt or an asphalt-elastomer blend, and the aqueous component contains water, a surfactant, and a high molecular weight, non-ionic, homopolymer of acrylamide. The emulsions find use as crack fillers for concrete or asphaltic roads and the like, or as coating compositions which can be sprayed on a building wall or the like as a waterproofing coating. The incorporation of the acrylamide ingredient into the composition ensures rapid and complete curing of other types of emulsions, and the emulsions possess physical properties and low-temperature flex properties which closely approximate those of the original asphaltic component.

Abstract: A cobalt-base alloy containing hafnium and having a high chromium, tantalum and zirconium content and a low silicon content has superior strength and improved resistance to corrosion by molten glass. The alloy is highly suited for use in spinners for spinning molten mineral material, such as glass, into fibers.