Abstract: A mold for uniformly heating working material to form a workpiece using a microwave oven. Uniform heating of a workpiece of variable thickness may be obtainied in a microwave oven with a uniform electric field in its cavity if the mold material is selected to have a dielectric constant and a thermosensitivity equal to that of the working material. The thermosensitivity of a material is its dissipation factor divided by the product of its density and specific heat. Uniform heating of a uniformly thick workpiece can be obtained in a conventional microwave by selecting the mold material to have a relative thermosensitivity equal to that of the working material. The relative thermosensitivity of a material is its dissipation factor divided by the product of its dielectric constant, density, and specific heat.

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 continuous process provides a devolatilized liquid injection moldable silicone composition. In the process, a filler, treating agent and silicone polymer are introduced into an extruder having a length to diameter ratio of at least greater than 50. The filler, treating agent and silicone elastomer are continuously compounded in the extruder into a devolatilized liquid injection moldable silicone composition. A system for preparing a liquid silicone rubber composition comprises a mixer to prepare a concentrate of filler and silicone polymer, a long extruder having an L/D ratio of greater than 50, connected to the mixer to receive the concentrate from the mixer and to compound and devolatilize the concentrate, a treating agent and silicone polymer into a liquid silicone rubber composition containing volatiles and a cooler to receive the liquid silicone rubber composition to cool, homogenize and further devolatilized the composition.

Abstract: The invention provides a method of injection molding a part having an undercut region and a method of assembling a jointed structure from several parts. A two-part mold has a common cavity with part of the cavity in each mold part. A combined pin-in-a-sleeve extends into the cavity in one of the mold parts in order to form a bore in a part to be molded in that cavity. The pin provides a portion shaped to form a first undercut region in the bore. A second pin extends into the cavity in the other of the two mold parts. The two pins are aligned to form a single bore in the molded part while in the cavity. The second pin also has a portion shaped to form a second undercut region in the bore. After an injection molded part is made, the mold opens a limited and discrete distance to allow the molded part to be released from the hold of the mold cavity. Then, the mold opens fully for the continuation of a multi-step operation to pull the pins out of the undercut regions.

Abstract: A molded part ejection tystem (103) includes a drive mechanism having a reversible servomotor (240). The drive mechanism for the ejection system includes a cam-and-follower arrangement whereby a circular cam member (252) is driven by the servomotor (240) through a drive shaft (250) that is connected with the cam member (252) and is offset from the center of the circular cam track (254). A cam follower (260) connected with an ejector drive rod (238), and the cam follower (260) rides in the cam track (254) to cause linear movement of the ejector drive rod (238) as the cam follower (260) follows the circular cam through its non-circular path of motion. Rotation of the servomotor (240) in one direction of rotation operates the part ejection system, while rotation of the servomotor in the opposite direction of rotation provides power to another portion of the machine during another portion of a molding machine operating cycle, such as a core-pull system.

Abstract: Stripper assembly for an injection molding machine comprising at least one slide pair having a first slide and a second slide and actuation means operatively coupled to said first slide for moving the first slide in a first direction. According to an important aspect of the invention, the stripper assembly further comprises transmission means operatively coupled to said first slide and said second slide for transforming the movement of the first slide in the first direction in a movement of the second slide in a second direction, the second direction being opposite to the first direction.

Abstract: An injection molding system for molding a hollow plastic article employs a hollow mold core having a longitudinal axis and a core runner cavity that has a uniform cross section throughout and which extends to the open end of the mold core. The mold core includes at least one core ejection gate and at least one core inlet gate leading from the outer surface of the core wall to the core runner cavity. When molding is performed in stages, there is it least one core ejection gate for each stage of molding. The core is clamped in between separate sets of molding blocks for each stage of molding. A core end closure cap having a core extension cavity aligned with the core runner cavity is used to close the open end of the mold core. A molten plastic is injected into the outer molding blocks and is confined to travel through the core inlet gate of the core without entering the mold cavity directly so that the molten plastic is forced to pass through the core runner cavity in order to reach the core ejection gates.

Abstract: A method for producing a three-dimensional object by stereolithography. A solid reinforcing material is mixed with the fluid medium so that at least a part of said solid reinforcing medium is located in the layer of the fluid medium between the top surface of the most recently formed lamina and the top surface of the fluid medium. An acoustic field is then established in the fluid medium such that this acoustic field exists in at least part of the layer of the fluid medium between the top surface of the most recently formed lamina and the top surface of the fluid medium. The solid reinforcing material is thereby moved with said acoustic force field. A three-dimensional reinforced object is thereby produced.

Abstract: A wax liquid temperature control device of a wax injector is disclosed. In this device, a coal oil heat exchanger controls the temperature of the coal oil in a predetermined range. Then, the coal oil is transferred to a wax liquid temperature control cylinder to control the temperature of the wax liquid so that the wax liquid is retained in a proper temperature for being injected to a mold. Therefore, the wax liquid temperature control device of a wax injector may cool the wax liquid in the mold rapidly.

Abstract: The disclosed methods and systems for inspecting and repairing vessels include a laser used to project a laser beam into a hot furnace or vessel, a laser reader to measure a point cloud formed when the laser light reflects from the wall of the furnace, means for selecting those points in the cloud that are more relevant, and using the points to produce a 3D image that corresponds to the geometry of the interior of the furnace or vessel. The disclosed systems and methods further include means for comparing the 3D geometric data corresponding to the interior of the vessel with 3D geometric data provided as a reference, generating a 3D repair trace based on the comparison, and controlling a spray gun for applying refractory material according to the trace by taking into account a set of physical variables related to the vessel and the refractory material.

Abstract: An atomizing apparatus for the production of powders or spray deposits, having an atomization device for receiving a liquid stream of molten metal or metal alloy to be atomized; at least two primary atomization gas jets for directing an atomization gas at an angle into the liquid stream in an atomization zone at an impinging point of the atomization jets to break the stream into atomized droplets; and at least two secondary jets for direction a controlling fluid at a pressure, flow rate and direction, the jets being aimed at the atomization gas jet or into the atomization zone, wherein said secondary jets control a backpressure generated by the primary atomization gas jets. The apparatus also includes means for in-situ controlling at least one of the relative positions among the primary atomization jets, the secondary jets, and the liquid delivery nozzle.

Abstract: An apparatus and method for providing targeted cooling to a pre-molded article, such as a preform. A cooling pin is inserted into the preform such that it makes contact with targeted area, such as the mold gate area. This permits conductive cooling of the targeted area. The apparatus and method are particularly suited to post-mold cooling in conjunction with a robotic take-out plate.

Abstract: A die for a rotary compression press, comprising a die holder axially supported in a guide bore and a die insert which is seated in the end-side bore of the die holder via a trunnion-shaped projection and is adapted to be mounted via releasable fastening means, wherein the projection is helically guided in the bore between axially spaced stops and is biased by a spring towards the associated front-end face of the die holder.

Abstract: Provided with a rod (1) meant to be attached to the ejector plate (9) which extends in a flat and elastically deformable neck (2) which ends in a small header (3) provided with a material recess (4) which is adapted in shape and size to the negative (5) to be obtained, said header (3) having a basically rectangular prismatic shape, that is with faces which are parallel by pairs, in order to simplify its machining, while the diagonal length of its section is equal to or smaller than the diameter of the rod (1), allowing its assembly from the outside of the body (7) of the mold. In order to attach the rod (1) to the ejector plate (9) said rod is provided with an externally threaded segment (10) on which moves a screw (11) which allows a precision adjustment of the axial position of said rod (1), which rod in turn is immobilized in an angular sense as it has a flat facet in correspondence with one of its generator lines, on which acts a key (14).

Abstract: A device for manufacturing, in particular, plastic caps for closing containers, comprising molding units, each of which is composed of a male mold part and of a female mold part. The male mold part has a punch which is directly provided with compressed air which exits through ports, so as to cause the separation of the cap from the punch and facilitate the removal of the cap.

Abstract: A solid imaging apparatus and method produces an integral three-dimensional object from a multiplicity of cross sectional portions of the object by selectively exposing successive layers of a liquid photoformable composition to actinic radiation. The apparatus includes a vessel for containing the composition so as to present a free surface, and a movable platform disposed within the vessel below the free surface. Part of the composition is transferred above the free surface by lowering and raising a dispenser at predetermined positions located away from the platform. A doctor blade contacts the composition transferred above the free surface, and then moves over the platform to form a substantially uniform layer of the composition.

Abstract: A method for fabricating a substantially transparent polymer substrate for an anti-scatter x-ray grid for medical diagnostic radiography includes positioning a phase mask between the substrate and a high power laser; providing a laser beam from the laser; conditioning the laser beam; ablating a first portion the substrate through the phase mask with the conditioned laser beam; and moving the substrate; and ablating a second portion of the substrate through the phase mask with the conditioned laser beam.

Abstract: A method and apparatus for synchronizing the flows of molten polymer or similar materials in molding systems which utilize manifolds to direct flow into one or more cavities of an injection mold. The apparatus utilizes intermeshing positive displacement, interconnected gearing systems similar to positive displacement gear pumps in hydraulic systems. These positive displacement gear mechanisms are placed in each parallel flow channel such that all flow in each channel passes through a gear mechanism. After a mold cavity is filled, the gear mechanisms can be utilized as melt pumps to continue packing or holding plastic in the mold cavity. By reversing the pump mechanisms, precise decompression of the flow channels to eliminate gate stringing and other adverse effects can be accomplished.

Abstract: An ejector device (200) for ejecting articles for injection molding machines for plastic materials comprising a movable mold-holding plate (13) supporting a mold half (20) defining a profile whereon a molded article (21) is formed, and moved by a double toggle mechanism comprising connecting rods (18) connected to the movable mold-holding plate (13); the device (200) for ejecting articles comprising a movable ejector plate (3) supported in translation by means of supporting columns (4) fixed to the movable mold-holding plate (13), and a pin (2) connected to the movable ejector plate (3) and acting on an ejector table (1) arranged into a mold half cavity (51) to favor ejection of the molded article (21), the movable ejector plate (3) being moved by means of lever mechanism driven by a ball screw (35) actuated by an electric motor (40).

Abstract: A plastic injection molding machine includes a rod having an end engaged with a slide member located beside the lower mold, and a position block connected to the upper mold. A pin is movably inserted in two respective inclined holes in the position block and the slide member so that the threaded section on the tip end of the rod is moved into the cavity with the movement of the slide member. The rod is located between two side members each have a threaded semi-circular recess. Another threaded section has the same threads of the thread section on the tip end of the rod is engaged with the two threaded semi-circular recesses so that the rod is rotatably withdrawn from the cavity smoothly when the rod is rotated by a motor.