Abstract: A method of forming a slip cast article is disclosed. The slip cast article is formed in a casting volume of a forming mold which has a portion thereof formed of a dissolvable organic material which has binder properties. A casting slip is cast into the casting volume. The vehicle of the casting slip is drawn off to a level which provides a consolidated casting in the casting volume containing sufficient vehicle that the casting is resistant to shrinkage. The consolidated casting and the organic mold portion are placed in a solvent for the mold portion so that it may be dissolved. The solvent for the mold portion is one which is miscible with the vehicle of the casting slip. The consolidated casting is maintained in the solvent after the organic mold portion has been dissolved so that the dissolved organic material previously forming the mold portion may penetrate into the consolidated casting.

Abstract: A process for the continuous production of silicon rods or tubes by the dsition of silicon from the gaseous phase on the inner wall of a carrier tube heated to the deposition temperature, in which a cooled, hollow metal cylinder is placed in a reactor having one open end, and a flexible band, substantially resistant to silicon at the deposition temperature, is continuously wound onto the cylinder in an overlapping manner at an angle of pitch from 5.degree. to 40.degree. so as to form the carrier tube for the silicon to be deposited; the tube is continuously drawn off the metal cylinder by a rotary traction movement and the portion of the tube adjacent the metal cylinder and still in the reactor is heated to the deposition temperature of about 1050.degree. to 1250.degree. C, while at the same time the gaseous mixture is passed for decomposition through the tube under a pressure exceeding the external atmospheric pressure by 0.

Abstract: The method of producing a multi-layer capacitor which has a body of alternate layers of a dielectric and a conductor with each conductor layer being sandwiched between a pair of dielectric layers and with alternate ones of the conductor layers extending to opposite ends of the body. A nickel termination film is provided on each end of the body and contacts the conductor layers which extend to the respective end of the body and a solder film is coated on each termination layer. The capacitor bodies are terminated by mounting a plurality of the bodies on a support sheet and encapsulating the support sheet and capacitor bodies in a plastic block with the ends of the capacitor bodies being exposed at opposed surfaces of the block. The exposed ends of the capacitor bodies are simultaneously coated with the termination film and then the solder film, and the terminated capacitor bodies are removed from the block.

Abstract: A process for the continuous production of a hose formed and vulcanized on a mandrel, comprising continuously forming and advancing a hollow mandrel, continuously forming said hose about said mandrel and continuously vulcanizing said hose while advancing said hose in axial direction with said mandrel, after said mandrel arrives at a predetermined location continuously destroying said mandrel within said hose, and removing the remnants of said mandrel from said hose. The mandrel may be formed of a brittle material such as sintered metal or of a relatively low melting material and its destruction can be effected by longitudinal severance into strips and/or melting by induced current and/or fragmentation by ultrasound. Alternatively the mandrel may be made of soluble material and subsequently dissolved away. Endless reinforcements may also be circulated and the mandrel formed so as to partially embed said reinforcements. Corresponding apparatus is provided.

Abstract: Very light weight containers are made of synthetic resin reinforced by fiber material, such as glass fibers or carbon fibers, by first manufacturing a hollow dimensionally precise core having the shape of the container and including access openings at each end of the container. The composite material is then applied to the prefabricated core and after the setting of the composite material the core is either completely or partially removed by chemical means, which are pumped through the inside of the container to etch away the core, which is, for example, made of aluminum. A very controlled and precise core removal may be accomplished in this manner.

Abstract: A core element preferably of plastic material is provided wherein one embodiment of the core element comprises (1) a tubular body member and (2) a tubular coupling member of water-degradable material disposed within one end of the tubular body member and extending axially outwardly therefrom, and (3) a tubular coupling member of water-degradable material disposed within the other end of the tubular body member and also extending axially outwardly therefrom, including also diametrically opposed lug members extending radially outwardly from the tubular coupling member that engage a slot disposed in the wall of the tubular body member whereby the tubular coupling member may be moved into and out from the tubular body member as in a telescoping manner.

Abstract: A female attachment for a dental prosthetic device is made by embedding the precision male part of a precision core into a wax-up, leaving the anchor part thereof exposed; sculpting the wax at the boundary line between said precision male part and said anchor part; investing the wax-up and core with investment material; removing the wax, leaving the core and the investment material to form a mold cavity; casting the prosthetic part in the mold cavity to form a female attachment in the resulting prosthetic device; and thereafter removing the core and the investment material.

Abstract: Thermoplastic resinoid hot melt compositions which find particular utility in the field of fixturing matrices and as pattern materials for producing investment casting molds. The hot melt compositions include, as an essential ingredient, the reaction product of a methylolurea with at least one fatty acid containing from 12 to 20 carbon atoms per molecule.

Abstract: Method of making artificial tooth inlays and crowns by electrolytically depositing a metal, preferably gold, matrix on a preformed model and subsequently building up porcelain on the matrix. The matrix may then be removed prior to cementing the inlay or crown to the patient's tooth; or alternatively the inlay or crown may be cemented to the patient's tooth together with the matrix.

Abstract: A method of producing synthetic resin spinnerettes. Vertically extending synthetic filaments are mounted on a frame structure and placed in a mold. A thermoplastic or themosetting resin is poured into the mold and allowed to set. The molded body is removed from the mold and the filaments are removed therefrom to leave orifices.

Abstract: Process for producing a water-soluble core for pressure die casting by pre-drying a granular water-soluble salt having grain size of less than about 1000 microns so that the moisture content thereof becomes less than 1%, molding under compression the granular water-soluble salt into a desired shape and volume at a pressure of between about 1.5-4 tons/cm..sup.2, and if necessary, sintering the molded salt at a temperature of between about 100.degree.-300.degree.C. The core for pressure die casting acting as a cavity former within a casting and substantially consisting of a water-soluble salt and having a compressive strength of between about 800-1480 kg./cm..sup.2, a bending strength of between about 200-370 kg./cm..sup.2, and a density of between 2.05-2.12.

Abstract: A method of manufacturing a heat exchanger comprises temporarily suporting a number of tubes in a first mould using a plurality of removable tube plates. The first mould is then filled with a molten, low melting alloy. After the alloy has set, the assembly is removed from the first mould and the tube plates are disintegrated by solvent or chemical action. The assembly of tubes supported by the set alloy is then inserted into a second mould and plastic material is injected into the mould to form a thin shell around the tubes and alloy and may also form header tanks of the heat exchanger. Finally, the whole assembly is removed from the second mould and the alloy is melted out to leave the completed heat exchanger. The method is also applicable to the manufacture of other hollow articles having a complex internal configuration.

Abstract: A method for molding one piece seamless contoured structures. The mold consists of a hollow, cylindrical mold member whose internal surface area defines the external surface of the piece to be molded, that is adaptive to receive a piston having a reservoir containing a fluid plastic and a mandrel mold member of low melting alloy whose shape defines the internal surface of the molded structure. The piston is forced upward to cause the fluid plastic to flow into the interstices and allowed to cure. Heat is applied to the mold assembly to melt the alloy to allow removal of the contoured structure when the mold assembly is disassembled.

Abstract: An asbestos-vinyl chloride polymer composition suitable for melt processing into rigid products is disclosed. The composition comprises (a) a vinyl chloride homopolymer, vinyl chloride copolymer or a mixture thereof, (b) up to 150% by weight based on the weight of polymer of asbestos, and (c) a stabilizer system composed of 1-5% by weight based on the weight of polymer of at least one organometal compound wherein the metal is selected from Ba, Cd, Zn, Pb, Sn, Ca or combinations thereof, at least 3% by weight based on the weight of polymer of epoxide and a compound selected from a polyol or a metal derivative of the polyol or an amino compound of polyacetic acid in an amount of 3-20% by weight based on the weight of the polymer.

Abstract: In the manufacture of a mould by the so-called lost wax method, the position and space occupied by a set of blank-carrying elongate members of fusible or calcinable material supported on an ogival head or cone are controlled by a gauge including a ring slidably mounted along a vertical rod. The gauge is then replaced by a cylinder forming a receptacle which receives a hardenable refractory material embedding said set. After hardening, the cone is removed and the fusible or calcinable material removed by heating to provide mould cavities.

Abstract: The invention relates to a method for producing a guiding device for flexible materials in which an element, representing the actual guide passage to be produced, is made with the aid of a malleable material; the element is positioned in a mould which has the general shape of the outer contour of the device to be produced; a resin is cast inside this mould and onto the element, and the malleable material constituting the inner element is then eliminated with the aid of an agent which has no action on the resin.