Abstract: A stereolithographic method and apparatus for forming polymeric structures comprising a plurality of overlying layers, each layer formed by polymerizing a thin layer of liquid photopolymer on a prior layer. Crevices formed at the layer interfaces are filled by a stereolithographic method comprising lifting the multilayered structure from the liquid photopolymer, draining excess liquid therefrom, tilting the structure to provide an acute angle of incidence between an incident radiation beam and a side wall of the object, and applying radiation to the crevice to polymerize at least the surface of a quantity of liquid photopolymer therein. The structure may then be subjected to a separate final full cure to fully harden the structure. An exemplary use is the packaging of electronic components and the like.

Abstract: Process for the production of semiconductor crystals with high resistivity of the CdXTe type, wherein X=Zn, Se, ZnSe or 0, characterized in that it consists in carrying out a multiple doping with iron and with at least one second doping element selected from the group formed by the elements of group III of the periodic chart of the elements.

Abstract: A method for fabricating a buried strap forms a dielectric collar along sidewalls of a trench. The trench is formed in a substrate. The trench is filled with a conductive material and the conductive material is recessed in the trench to expose a portion of the collar. A masking layer is deposited in the trench over the exposed portion of the collar. A portion of the masking layer is removed over one side of the collar and a portion of the collar is etched on the one side. A buried strap is formed on the conductive material, which connects to the substrate on the one side.

Abstract: A corrugator and mold management apparatus and methods for continuously forming transverse corrugations and other shapes in a tubular polymer melt parison formed by an extrusion die employs a plurality of molds that interlock when mated. Each mold has common outside dimensions and a pair of open linear bearings that provide the mold axis and maintain alignment of the molds parallel to and in the same horizontal plane as the axis of the extrusion die. The molds are moved axially along supported rails by bi-directional linear actuating modules and between the pairs of supported rails by lateral transport units. Inner supported rails define the mold tunnel and outer supported rails provide an outer path to move molds upstream back toward the extrusion die. The lateral transport units include extensible rails that facilitate the transfer of molds to and from the mold tunnel and the outer return paths. Delivery units remove from and introduce molds from a plurality of parking stations.

Abstract: The invention concerns a procedure for the production of tubes from concrete mix, whereby the concrete mix is filled into a shaping device, for the purpose of shaping, where it is condensed with a tool. The invention should enable an effective and fast production of concrete tubes with high quality regarding the uniformity of the material characteristics. In such a procedure the concrete mix is condensed in an interspace between two parts of a tool that rotate relative to each other.

Abstract: The present invention relates to an improved method and apparatus for injection molding and cooling molded articles such as preforms so as to avoid crystallinity. The apparatus and method make use of a take-off plate for removing articles from a mold, which plate may include heat transfer devices for cooling exterior surfaces of the molded articles or preforms, and a system for cooling in a controlled manner interior surfaces of the molded articles or preforms.

Abstract: A method is provided for forming an inside nitride spacer in a deep trench device DRAM cell. The method includes etching a stud from a semiconductor material including a first spacer positioned on the sidewalls of the deep trench, wherein two of the sidewalls are formed of isolation trench oxide. The method further includes depositing an oxide layer on the surface of the semiconductor, and depositing a second spacer in the deep trench of the semiconductor, wherein the second spacer has a positive taper relative to the isolation trench oxide.

Abstract: A soft plastic fishing lure or other product may be made to float by incorporating air bubbles therein by molds that draw air from inside the molds in which the lures or products are cast.

Abstract: A manually operated dough press comprising a frame with a base and a housing, an upper platen having a working surface, and a lower platen attached to the base and having a working surface opposed to, substantially parallel to, and spaced from the upper platen working surface. The upper platen is attached to the lower end of a shaft that extends from the housing and mounted for reciprocating motion. A pair of mated interlocking components, one attached to the shaft and one attached to the housing, provide stability for vertical reciprocation. The drive mechanism includes a rod fixed perpendicularly to the shaft interlocking component, a pair of cam with spiral slots within which the ends of the rod ride, and an axle to which the cams are mounted and driven by a handle that rotates the cams to raise and lower the upper platen. Counterbalance for the upper platen/shaft is provided by a torsion bar assembly.

Abstract: In the method and apparatus for measuring the position of the phase interface during growth of a crystal from a melt in a crystal growth container according to the VGF method an incident optical signal is propagated to the phase interface between the melt and the crystal through a window (16) in the container (10) and a received optical signal reflected from the phase interface (14) is measured to determine the position of the phase interface. The position of the phase interface is established from the reflected signal by triangulation with a confocal optic system, by interferometric balancing or by transit time of the optical signal. The window (16) is preferably mounted in a preferably tilted orientation at the end of a tube (15), which is immersed in the melt (12).

Abstract: Gallium nitride is grown by plasma-assisted molecular-beam epitaxy on (111) and (001) silicon substrates using hafnium nitride buffer layers. Wurtzite GaN epitaxial layers are obtained on both the (111) and (001) HfN/Si surfaces, with crack-free thickness up to 1.2 m. However, growth on the (001) surface results in nearly stress-free films, suggesting that much thicker crack-free layers could be obtained.

Abstract: Disclosed is a mold for forming molded products including a guide mechanism for guiding at least one movable mold part into and out of the closed mold forming position with another mold part. In a preferred embodiment, the guide mechanism includes a mount for guiding the movable part of a mold into and out of the mold forming position with extreme precision. The guide mechanism in a preferred embodiment can be constructed of a structure fixed to a fixed mold part and a second structure sandwiching the fixed structure and movable in conjunction with the movable mold part. Bearings separate the fixed structure from the movable structure and permit movement of the mold mount into and out of the molding forming position. These bearings are preloaded by the compression of the fixed structure by two portions of the movable structure interconnected by a bolt and a preload spring.

Abstract: The invention relates to a rotary press with anti-rotation secured shafts and exchangeable punches attached thereto. The rotary press comprises a punch turn which is universally ensured with the use of anti-rotation secured punch shafts, meaning, not only with rotation-symmetrical but also with roll-guided punches, is solved in such a way that the exchangeable punch is executed in a rotational manner, where a circumferential recess in the stem of the punch is envisaged, into which a component such as a spring thrust piece engages for the purpose of fixation, and that the shell surface of the exchangeable punch indicates a zone which interacts with a zone of the external component, either force-locking or positive locking, in such a way that the punch receives a turning movement at a defined point of the pitch circle of the punch circumference.

Abstract: A mold positioning system (10) for use in guiding and aligning mold segments (11, 13) includes a male member (12) having a tongue portion (14) on one mold segment that engages a female member (20) attached to the other mold segment when the mold assembly (8) is closed. The female and/or male member (20, 12) are configured to receive a replaceable insert (36) in the areas of the mold positioning system (10) that are subject to wear. The replaceable insert (36)is easily removable for replacement to increase the life of the male and female members (12, 20).

Abstract: The invention relates to an ejector device for an injection-molding machine for plastics, having at least one ejector pin, which can be moved toward the mold and away from the latter through the center of a moveable die clamping plate by an actuator. In this arrangement, the actuator provided is a linear motor (21), which is arranged outside the central axis (I) on the moveable clamping plate (11) , and bar-shaped force-transmission elements (30), by means of which the linear motor can be brought into operative connection with the ejector pin (41), are provided.

Abstract: The thermoforming press has a frame, a forming die assembly affixed to the frame, a mold-supporting table suspended to the frame under the forming die assembly, and a pair of molds mounted side by side on the mold-supporting table. A drive system is provided for imparting a pendulum movement to the mold-supporting table for alternately registering one of the molds with the forming die assembly while the other mold is positioned at a part retrieving station. The part retrieving and stacking mechanism has horizontal and angular displacements only as the vertical component of the retrieving motion is provided by the pendulum system. Spring discs are mounted between the forming die assembly and the press platen to control the forces generated between the forming die assembly and each mold.

Abstract: The invention relates to a device for determining the operational status of an extruder that is used for the productive of a plastic profile. At least one measuring device for determining the quality of the melt is provided in an adapter part between an extrusion cylinder (3) and an extrusion nozzle (5). An especially exact determination of the extruder state is possible if the measuring device comprises a tube through which melt is continuously drawn off from the adapter part during the measurement and on which at least one pressure is disposed.

Abstract: The present invention provides a device for producing an unvulcanized rubber member for tire manufacturing. The device includes an extruder with a die that extrudes the unvulcanized rubber member to form multiple rib-protrusions that extend in a direction corresponding to a circumferential direction of the tire. A conveying apparatus receives the unvulcanized rubber member and conveys it in the extrusion direction. A roller has an outer surface with protruding portions that form multiple grooves in the unvulcanized rubber member that extend in a direction radial direction of the tire and intersect the rib-protrusions.

Abstract: A method of forming a curved hose and a mandrel for forming a curved hose is disclosed. A hose length is inserted onto a multi-legged mandrel to form a curved hose. The mandrel has at least two legs and the opposing ends of the hose are placed on the mandrel legs such that a portion of the hose is unsupported by an internal mandrel. The unsupported portion of the hose may be straight or may be looped to form a more complexly curved hose. The unsupported portion of the hose may also be held in position by an external mandrel.

Abstract: A tooling system in a press for forming a product from a blank of material disposed between a punch assembly and a die assembly and a method of using the same. The tooling system comprises a knockout and a bushing. The knockout further comprises a shaft having opposed ends, a plate fixed to one opposed end, and a tapered portion. The bushing is supported by one of the punch and die assemblies and defines a lumen configured to slidably receive the shaft for axial movement between an extended position and a retracted position. The lumen has a tapered receiving section at one end thereof configured to mate with the tapered portion of the knockout when the shaft is in the extended position.