Abstract: A steel pipe is jacketed by concurrent extrusion of an ethylene hose concentric with a copolymer hose serving as an adhesive, the pipe passing through the extruder heat at an approximately 10% higher speed. The copolymer is predried, and the pipe is preferably precoated with heat-curable phenol or epoxy.

Abstract: A foamed ceramic article is manufactured by adding hexagonally crystalline boron nitride as a foaming agent to a raw material formed preponderantly of a feldspar group mineral and sintering the resultant mixture.

Abstract: A ceramic green arc tube for a metal vapor discharge lamp wherein an outer diameter of the arc discharging portion is larger than that of the end portions holding the discharging electrodes is produced by preparing a stiff plastic body consisting mainly of a ceramic material or which main component is alumina, and a binder of which main component is thermal geltinizing organic substance; forming the prepared body into a straight tubular body by means of an extruder; placing the tubular body into an inner cavity of molding die having the above described ceramic arc tube shape wherein the molding die has been previously heated; closing one end portion of the tubular body; applying a compressed fluid from another opened end portion of the tubular body into the inside of said tubular body to inflate the central portion of tubular body until contacting to the inner cavity surface of the molding die,; hardening and drying the inflated body with the heat of previously heated molding die; and ejecting the dried body

Abstract: A process and apparatus for producing a mixture of polymeric phases wherein a plurality of fluid material having different phases are fed into a phase programmer, and said phase programmer separately and sequentially injects pulses of said polymeric materials into a reservoir. The material may be passed through an extrudate shaping device so as to provide a moasic structure comprising an agglomeration of a plurality of said polymeric phases, each of which phases are substantially non-continuous in any dimension and which are interrupted with substantially no intermixing between phases.

Abstract: Coated cutting tools and coated cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, intermediate adherent coating layer of a refractory material and an outer adherent coating layer. The intermediate adherent coating layer has a different chemical composition than the outer adherent coating layer. The silicon nitride substrate body consists essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.

Abstract: Provided is an information recording medium manufacturing device of the type in which a radiation curable layer-forming liquid resin is injected into a gap between a planar stamper carrying an information recording signal pattern to be transcribed and a planar flexible carrier member having at least one signal pattern carrying surface through means, for injecting the liquid resin, then the liquid resin is uniformly developed all over the surface of the carrier member by pressing a holding plate against the carrier member, and is set by irradiating radiant rays so as to form a transfer layer, thereby to obtain an information recording medium by separating from the stamper the carrier member united with the transfer layer.

Abstract: An apparatus and a method of use thereof for cast encapsulation of items, particularly electronic components. The apparatus consists of a plurality of identically shaped split matrix elements. Each matrix element has a first surface for receiving and securing the item to be encapsulated. A second surface of another identically shaped matrix element, located on a side thereof opposite to its first surface, is then mated with the first surface securing the item. Thus mated, the first and second surfaces establish a molding cavity for enclosing the item and an orifice providing access thereto. This process of securing an item to a first surface and enclosing it with a second surface is repeated thereby assembling a stack of matrix elements. This stack is then rigidly secured and the molding cavities are filled with particulate filler material through upright orifices. Excess filler is removed by quickly turning the stack over and then righting it again.

Abstract: Paraffin wax is continuously extruded through an extrusion die into a sag-free ribbon of good surface characteristics by extruding the wax at a temperature within the range of about 2.degree. C. below and about 10.degree. C. above the solid state transition temperature of the wax.

Abstract: Long lengths of a heat-shrinkable sleeve for use in splicing electrical cables and the like are made in a continuous process. The sleeve is formed around a permeable core, and the core and sleeve are advanced together in an axial direction, the leading end of the advancing sleeve being hermetically sealed. The core and sleeve pass through a heating station, thereby heating a portion of at least the sleeve, and a fluid is introduced under pressure into the core, thereby internally pressurizing the sleeve to effect a radial expansion of the heated portion thereof. The core and sleeve then pass through a cooling station, thereby cooling the expanded sleeve to stabilize it. A stress graded compound also for use in splicing electrical cables and the like is made by heating a dimethyl silicone liquid to remove entrapped gas and mixing the liquid with a silicone carbide powder having a particle size capable of passing through a 400 mesh screen.

Abstract: Functional agglomerated speckles, for incorporation in dentifrices, include agglomerates of a water insoluble powdered functional material and water insoluble, ethanol soluble ethyl cellulose. Such speckles satisfactorily maintain their integrity and identity during processing of the dentifrice after addition of the speckles to the main dentifrice body but on storage, after packaging of the dentifrice in dispensing tubes, soften sufficiently so as to become essentially impalpable to one utilizing the dentifrice in brushing his teeth. Despite such softening the speckles continue to maintain their identity as speckles in the dentifrice. The speckles are especially useful in translucent or transparent gel dentifrices which contain components, such as flavoring and surface active agents, which may controllably soften the speckles on storage.

Abstract: An improvement in methods and compositions for molding plastics in which the waxy release agent is treated with an indicator dye invisible under normal light but visible under UV illumination, so that completeness and adequacy of the initial application and remanence of the waxy release agent during repeated cycles can be monitored readily without adversely affecting part quality.

Abstract: A process for continuously monitoring and controlling product film quality from a polymer production unit and for automatically separating acceptable and unacceptable polymer product includes the steps of continuously formulating a solid particulate polymer product in the polymer production unit; withdrawing a product sample and preparing a film from the product sample; analyzing the film properties; continuously delivering the product remaining after product sampling to a residence holding device; and providing a signal representative of the film analysis so as to divert acceptable product in the holding device to product storage or unacceptable product to a by-product delivery line.

Abstract: Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a composite silicon nitride substrate having at least one intermediate hard adherent coating layer of a refractory material and an outer adherent coating layer. The intermediate adherent coating layer has a different chemical composition than the outer adherent coating layer. The composite silicon nitride substrate body consists essentially of particles of a refractory material uniformly distributed in a matrix consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of yttrium oxide, hafnium oxide, the lanthanide rare earth oxides, and mixtures thereof.

Abstract: Cutting tools and cuttng tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, adherent coating layer of aluminum oxide. The silicon nitride substrate body consists essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.

Abstract: A composite article and cutting tool are prepared by densification to form a body consisting essentially of particles of hard refractory material uniformly distributed in a matrix consisting essentially of a first phase and a second phase, said first phase consisting essentially of crystalline silicon nitride and said second phase being an intergranular refractory phase comprising silicon nitride and a suitable densification aid selected from the group consisting of yttrium oxide, zirconium oxide, hafnium oxide and the lanthanade rare earth oxides and mixture thereof.

Abstract: The invention relates to a method and an apparatus for the production of a helical spring from fiber-reinforced plastic, where a strand of fibers and plastic resin is wound onto a rotationally symmetric rotor provided with a spiral groove then hardened and finally removed from the rotor. In order to be able to produce helical springs with desired and in particular circular cross sections of the strand with small tolerances of the shape, a stator with an inner spiral groove is surroundingly disposed around the rotor, which spiral groove together with the spiral grooves of the rotor form the cross-sectional profile of the strand, where the rotor and the stator relative to the rotation of the rotor are shifted axially with respect to each other in an amount corresponding to the slope of the spiral grooves.

Abstract: Disclosed is a chemical polishing compound for silica based ceramics.

Abstract: A process for extrusion molding a polyamidoimide resin comprising: feeding a polyamidoimide molding material in a granular solid or powder form into an extruder; then simultaneously compressing and melting the polyamidoimide molding material under a pressure of about 300 kg/cm.sup.2 or more by heating it to a temperature between the melting point and the decomposition temperature of the polyamidoimide resin; and next introducing the molten polyamidoimide molding material into a die such that the molten material is shaped to a desired form, solidified in the die, and is extruded from the die in a solidified form.

Abstract: Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, adherent coating layer of a refractory metal carbide. The silicon nitride substrate body consists essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.

Abstract: Sintered silicon carbide composites containing diamond crystals are made through a process wherein a first dispersion of diamond crystals and carbon black in paraffin is formed, along with a second dispersion of carbon fiber, carbon black and filler in paraffin. One of the dispersions is compacted to produce a physically stable intermediate compact which is then recompacted with the remaining dispersion to produce a binary compact. The latter is subjected to a vacuum for a period of time at a temperature sufficient to vaporize essentially all of the paraffin, after which the binary compact is infiltrated with liquid silicon and sintered to produce a .beta.-silicon carbide binder uniting the resulting composite.