Abstract: With the fabrication method and apparatus for the performance of such method, a blank containing hollow spaces extending between its lower side and its upper side is arranged in a mold closed at least at five sides and expanded. The blank is arranged in a mold box, whose area in plan view is larger than the plan view area of the blank. The space between the blank and the mold box wall and possibly hollow spaces which are retained in the blank are filled with a granular filler material, for instance sand, which is trickleable at least during the mold release of the expanded blank. In this way there is ensured for a simple and positive mold release and a protection of the mold box. The molded body can have different constructions and serve the most different purposes. The molded body is preferably constructed as a lightweight structural element for construction purposes.

Abstract: An injection molding process for molding an article having accurate dimensions without sink marks includes the step of feeding high pressure air into the core portion of a shell or solid molded mass formed by the preceding injection molding step. Preferably, the wax material is injected into a mold cavity through a throttled inlet port to flow thereinto as a vigorous turbulent flow. A separate flow line is provided for feeding high pressure air in the preferred embodiment. More preferably, the volume of injected wax is substantially smaller than the volume of mold cavity.

Abstract: A method for producing an external breast prosthesis or support by forming a mold directly from the subject for whom the prosthesis is being prepared. After a molding material is applied to the subject's breast, the breast is immersed in an isodensity liquid to present the breast to a zero-gravity condition while the molding material cures.

Abstract: Reinforced phenolic laminates are provided with a finishing coat of a butylated phenol-formaldehyde resin, thereby removing surface irregularities. The finishing coat can be mass-pigmented to the desired color, thereby obviating the necessity of any additional color-containing coatings.

Abstract: An improved apparatus for the production of particulate metal is disclosed. The apparatus includes a containment vessel having a sidewall and an endwall, a source of metal external to the vessel, nozzle means carried by the endwall and providing communication between the vessel and the external source of metal, and release means associated with the sidewall to inhibit deposition of the particulate metal on the sidewall.

Abstract: A mold for molding elongated workpieces is comprised of three vertically oriented quadrants and a fourth quadrant pivotally mounted relative to the three quadrants between a mold open position and a generally vertically oriented mold closed position. A workpiece is loaded into the mold by positioning end plates on the workpiece and locating the combination on the fourth quadrant by positioning of the end plates on locating pins projecting from a frame member or tilt beam associated with the fourth quadrant. Slide assemblies are then moved into workpiece engaging positions on each end of the workpiece to accurately locate the workpiece relative to the fourth quadrant. The fourth quadrant with the workpiece locked thereon is then moved into a mold closed position for molding.

Abstract: An improved method for manufacturing a foam-filled polyurethane foam bun from foam particles having uniformly dispersed therewith large amounts of solid material bonded together with new polyurethane foam is described. The method comprises uniformly applying a liquid flexible polyurethane foam-forming material to a dispersion of foam particles and solid material to provide a blend, distributing the blend within a mold, and foaming and curing the foam-forming material by a plurality of steaming steps wherein the mold is flipped from a first to second position between steaming steps. The foam buns have a uniform density gradient. Foam buns are disclosed having a variation in density across the foam bun. There is also disclosed an improved char-forming foam obtained as a result of using boric acid in the foam-forming formulation.

Abstract: A method of injection moulding or casting comprises forcing a solid bar of the material to be moulded or cast as a plunger into a closed heating chamber having a discharge opening. The heating chamber is maintained at a temperature above the melting or plasticizing temperature of the moulding or casting material so that the leading end of the bar on entering the chamber melts or plasticizes therein and displaces molten or plasticized material from the chamber through the discharge opening. Apparatus comprises a body member formed with a heating chamber and a straight passage leading into the chamber, a plunger formed of the material to be moulded or cast being slidable in the passage. A thermal barrier may divide the passage into two successive portions.

Abstract: A method is described of producing a laminated structural material which includes the steps of stacking alternately layers of thermoplastics sheet material and one or more layers of material to be laminated, the material having been impregnated with a second thermoplastics material prior to stacking, placing the stack in a pre-heated mould or press and subjecting the stack to heat and pressure for a time sufficient to cause the thermoplastics material to flow and bond together the layers of structural material to be laminated and allowing the mould or press to cool sufficiently to avoid distortion of the moulded part before removal from the mould or press.

Abstract: Fiber reinforced plastic products are produced in such a way that there is uniform resin dispersion throughout the product. Fabric is woven on a loom, and the reed dents of the loom are varied from the center to the edges of the fabric so that when the strain in the wrap and weft yarns is released once the fabric is removed from the loom, the fabric has uniform porosity. After removal of the fabric from the loom it is impregnated with a resin, such as epoxy, phenolic, or polyester resins, dried, formed into a desired product shape (as by molding), and the resin is cured. The loom reed utilized to produce the fabric has parallel frame portions with parallel reed wires extending between the frame portions with the dent size larger at edge sections of the reed than at intermediate sections, and with the dent size at intermediate sections larger than the dent size at a central section.

Abstract: An energy sensitive fusible device fabricated by thick film techniques in which a fuse element is sandwiched between two glazes on a substrate, for use in programming thick film networks.

Abstract: A polylaurolactam mold is being produced by that a laurolactam melting at first is being mixed with a catalyst and the mixture afterwards being compounded with an activator and polymerized, whereby the polymerizing material is being cast to threads or cords and the reduced material is being injection molded at temperatures of 430.degree. F. to 490.degree. F. and at pressures of 50.10.sup.5 to 100.10.sup.5 Pa, whereby, according to the invention, before the molding 0.1 to 5 wt. % silicon fat is added to the granules. The then resulting molded products, especially protective helmets and protective plates, are distinguished by superior physical properties.

Abstract: A dual-lip shaft seal with two PTFE sealing members bonded to a molded elastomeric body, and a method and mold for its manufacture includes an elastomeric body bonded to the radial flange of a metal case and provides (1) a shaped lip with a garter spring held in a recess and, bonded to its other side, a frustoconical PTFE ring providing its sealing lip portion and (2) an inflexible portion bonded to a radially extending PTFE wafer.

Abstract: This invention relates to an injection molding system of the type wherein a heated probe is centrally located in the hot runner passage. The probe has a pair of circumferentially spaced melt channels, each with an upstream portion which branch out from a common central inlet to a downstream portion along the outer surface of the probe. The probe is seated in a well in the cavity plate and a hollow cylindrical insulating sleeve is located between the downstream portion of the probe and the wall of the well. The outer surface of the probe and the inner surface of the insulating sleeve have longitudinally extending grooves which are aligned to form the downstream portions of the melt channels. The insulating sleeve is formed of a thermoplastic material with low thermal conductivity and a high melting temperature.

Abstract: An improved process for making a vent for an "in the ear" hearing aid. A cavity is formed which corresponds to the structure of the ear canal and outer ear of the hearing aid user. A molding liquid, such as acrylic, is poured into the cavity. The liquid is allowed to partially cure and form a thin-walled shell inside the cavity. An elongated mandrel is then placed along the inside of the thin-walled shell, and additional liquid molding material is poured into the thin-walled shell around the elongated mandrel. The wall of the shell accordingly becomes thicker, enveloping the mandrel. The mandrel may then be removed, leaving the vent in the wall of the shell.

Abstract: A combination ion sensing and reference electrode and a method for producing it. The electrode is formed of bi-lumen plastic tubing using one lumen as sensing chamber and the other as a reference chamber. A portion of the sensing chamber extends distally relative to the reference chamber, and is permeated with an ion selective material by soaking that portion in a solution containing the ion selective material. The method of manufacture is thereby simplified and sealing of the chambers is improved.

Abstract: A method for the production of particle boards by addition of a hydrophobing agent and a curable glue to wood based particles, shaping of the particle mass and subsequent curing of the glue by application of pressure and heat. The quality of the board is increased by keeping the hydrophobing agent heated above its melting temperature in the presence of the particles before the gluing.

Abstract: A composition of flake graphite, binder clay and a refractory material is extruded from an auger machine into a mold to form a cylindrical graphitic casting nozzle brick. The mold includes a coaxial core terminating short of an extrusion die of the auger machine, so that the graphitic casting nozzle brick as extruded has a longitudinal bore with one end closed, with transverse holes being subsequently defined through the nozzle brick across the bore adjacent to the closed end. As an alternative, a coaxial core may be connected to an extrusion screw of the auger machine to define an axial through bore in the casting nozzle brick as the latter is extruded.

Abstract: A pressure generating device for use in injection moulding at a high pressure or normal pressure where the pressure generating device is attached to the mould, the platens, the tie bars or other suitable parts of the injection moulding machine which device operates separately from the normal pressure generating mechanism and acts on the content of the mould cavity only, said device comprising a pressure generating part, e.g. a hydraulic cylinder (1) connected with a plunger (2) which can bring the pressure inside the cavity to the desired level during an injection cycle and a non-return flow valve (3) or any other element closing the mold cavity from the injection side, and the use of said device in injection moulding at high pressure or normal pressure.

Abstract: A molded fiber reinforced plastic leaf spring. The spring has a curved central section composed of longitudinally extending fibrous strands impregnated with a cured thermosetting resin. The central section is generally rectangular in cross section having rounded upper and lower edges and a ground-off parting line disposed substantially at the neutral axis of the spring.