Abstract: A process for producing high precision apertures in plastic components comprises the steps of: injection molding the component from a crystalline or semicrystalline thermoplastic material wherein at least one aperture is formed in the component during the molding step; inserting an annealing rod having an oversized diameter with respect to the aperture into the aperture; placing the component, with the annealing rod inserted into the aperture, into an oven at an elevated temperature for a period of time; allowing the component to cool; and withdrawing the annealing rod from the aperture of the component.

Abstract: A method for molding plastic materials which release gas during molding by operating a mechanical rotary crank type press having opposed metal die parts respectively carried on a slide driven by a crank mechanism and on a floating plate supported on a die cushion and movable against a bolster on the press. The method involves heating a blank of a plastic material which releases gas during molding to a molding temperature and placing it between the die parts. Then, the crank mechanism of the press is operated to drive the slide in a direction toward a bottom dead center position to a first position which is within a range of positions in the movement of the slide where only the reacting force of the die cushion is received by the blank and holding the slide at this first position for a time up to several seconds for permitting release of the gas from the plastic material of the blank.

Abstract: In a process of forming a refractory mass in which having an average grain size of less than 50 .mu.m are burned while mixed with solid particles of at least one incombustible refractory material during projection of the mixture against a surface to form a coherent mass on said surface, the oxidizable material comprises silicon and aluminium, the aluminium being present in an amount not exceeding 12% by weight of the total mixture.

Abstract: An injection molding machine with a mechanism for pivotably repositioning the die closing unit between a horizontal orientation and a vertical orientation, featuring a pivot frame composed of tubular members to which the die closing unit is fixedly attached and two transversely aligned stationary pivot bearings on the machine base, in relation to which the pivot frame is axially adjustable by means of two threaded spindles. The pivotal repositioning is obtained by means of a worm gear drive on one of the pivot shafts, and both pivot shafts cooperate with threaded clamping plugs which press the pivot frame members against the pivot bearings to transfer the pivot connections into rigid mounting attachments on the machine base.

Abstract: A clamping device for clamping the form tools (3) to the form supports (1) of an injection molding machine. The form tools (3) are provided with clamping bolts (6). At the form supports (1) there are lateral recesses (17) in which locking means (9) are arranged which fix the clamping bolts (6) within the form supports (1). Furthermore, positioning means for positioning the form tools (3) in the closing plane are provided.

Abstract: An injection mold assembly having means to stabilize interior components. A male mold has a plurality of upstanding cores with free distal ends extending into a female mold. A plurality of wedges extending from the female mold are positioned between some of the cores to limit movement thereof as plastic material is injected into the mold assembly at other locations to cooperatively with the wedges limit movement of the free distal core ends.

Abstract: A specific laser-sensitive layer is formed on a substrate so as to manufacture an original disk. The laser-sensitive layer absorbs energy from a laser beam and locally expands and deforms. The laser beam which has a predetermined beam energy to indicate pretrack information for, for example, a self-write/read type optical disk, is used to irradiate the laser-sensitive layer. A spiral projected pattern is locally formed on the laser-sensitive layer, such that a gas is discharged from laser-incident portion which then expands and deforms. A structure so obtained is used as an original disk.

Abstract: Cylindrical embossing tools are constructed from one or more masters formed by accurately scribing the face of a substrate along three axes in the face to produce a pattern of tetrahedrons. The plurality of masters, or replicated copies made from a single master, are assembled in a fixture and seamless copies are made by electrodeposition of nickel using various shielding and grinding methods to provide replicated copies of uniform thickness. The replicated copies are assembled and used to form larger electroforms until a generally cylindrical embossing tool of the correct width and circumference is created. Novel processes and apparatus are provided for removing the electroformed cylindrical tool from its mother cylinder.

Abstract: Video discs are cleaned with a water-based solution to remove water soluble salts from the surface of the discs, thereby reducing the moisture sensitivity of the discs.

Abstract: A quick change locator clamp assembly for a plastic molding machine having opposed top and bottom platens adapted to receive, mount and support a sectional die having top and bottom clamp plates which comprises laterally spaced pairs of opposed locator clamp assemblies mounted upon and projecting from the platens. Formed within the clamp plates on one side of the molding die are similarly spaced opposed pairs of locator slots. Each clamp assembly includes a locator key mounted upon a platen of a shape to snugly receive the corresponding clamp plate slot for locating the molding die in a predetermined position relative to the platens. A rotatable clamp is mounted upon the key and adapted for operative retaining engagement with an adjacent clamp plate. The sectional die includes a reciprocal ejector plate, there being at least one reciprocal knock-out bar on the molding machine.

Abstract: Release properties of stampers used in the manufacture of capacitive electronic discs are improved by passivating the molding surface of the stamper with an oxidizing agent.

Abstract: This invention relates to an injection molding system having a valve pin which is hydraulically actuated between an open and a closed position in which its tip end is seated in a gate leading to the cavity. The actuating mechanism includes a piston secured to the driven end of the valve pin which reciprocates in a cylinder. The cylinder has an inner cylindrical member which is brazed in an outer member with a flanged portion. Separate hydraulic fluid ducts extend from the flanged portion through the outer member, along grooves in the outer wall of the inner member and then through holes through the inner member to conduct hydraulic fluid to opposite sides of the piston. The flanged portion of the outer member has a pair of passages extending through it, each connected to one of the ducts. Alternate ends of the passages are sealed off so that hydraulic fluid may be received either from supply lines drilled through the back plate in which the cylinder is seated or an abutting top plate.

Abstract: A process and apparatus for the internal gating of molds used to make a shaped article of aggregate filler infiltrated with a curable binder, including preparing a mold having a cavity and having gating tubes extending through the mold cavity and spaced from its surfaces, and the gating tubes having walls with multiple openings therethrough which are located inside the mold cavity, the cavity being dry-packed outside of the tubes with aggregate filler and the interstitial spaces therebetween being pumped full of liquid binder to form a matrix, the binder entering through the tubes and their openings and progressively expanding through the interstices while expelling air from breather holes, the binder then being cured in the mold either with the tubes still in place or with the tubes removed and the spaces filled with similar aggregate and binder before curing is completed.

Abstract: An improved apparatus and method are disclosed for forming molded plastic articles, such as support devices, having wooden or otherwise fibrous backing members bonded thereto. The apparatus includes an injection molding machine within which the molded plastic articles are formed. Continuous strips of backing material are provided, and are drawn through the apparatus by a novel feed roller mechanism which is intermittently operated in synchronization with the cyclical operation of the injection molding machine. A punch and die mechanism associated with the molding die assembly of the injection molding machine severs discrete backing members from the continuous strip of material, and thereafter advances the severed backing members to a portion of the periphery of the one or more molding cavities defined by the molding die assembly of the machine.

Abstract: Method for repairing the damaged refractory lining wall of a blast furnace which includes cutting an opening through the steel shell and the refractory bricks of the furnace, inserting an injection nozzle for injecting a repair material into the opening, the injection nozzle being provided with a plurality of reinforcing studs, injecting the repair material into the furnace under pressure via the injection nozzle, and simultaneously imparting an external force onto the plurality of reinforcing studs to automatically build up a repaired refractory brick having the reinforcing studs imbedded therein.

Abstract: An injection sleeve molding machine having a rubber injection section and a sleeve molding section, in which the sleeve molding section includes a barrel with a mold cavity for receiving uncured rubber material, and two mandrels having a forward and rearward end inserted axially and alternately into the cavity of the barrel for a molding operation. The rear end of the mandrels are mounted on a pivoted member on a carriage which travels parallel to the axis of the mandrels for inserting the mandrels in the cavity of the barrel. When the molding operation has been completed, the carriage withdraws the mandrel from the cavity, and the pivoted member for the mandrels is rotated angularly to place a mandrel in position for insertion in the cavity. When it has been inserted in the cavity, the second injection operation is performed and, while that second operation is being performed, the previously formed molded sleeve is stripped from the first mandrel, thus preparing it for the next succeeding molding operation.

Abstract: An apparatus for injection molding an article includes a pair of mold members, at least one of which is movable toward and away from the other. Each mold member includes a base plate, a manifold plate and a cover plate. Each base plate has inner and outer surfaces with a mold cavity in its inner surface and an annular recess in its outer surface. A plurality of connected grooves is in the bottom of the recess to form a channel. The manifold plate is an annular plate which is seated in the recess in its respective base plate. The manifold plate has inlet and outlet passages which extend to separate ones of the grooves in the base plate. The cover plate extends across the outer surface of the base plate and the manifold plate to hold the manifold plate in the recess. One of the base plates has a hole therethrough from its outer surface to its mold cavity to allow the flow of molding material into the mold cavity.

Abstract: Polysulfone cast films, including polyethersulfone cast films, are partially gelled with mineral acid prior to or during the conventional water gelation to control the porosity of and improve the productivity of reverse osmosis and ultrafiltration membranes thus produced. The partial gelation may be carried out prior to the water gelation by contacting the cast film with the mineral acid in a gaseous or aqueous form and the gaseous form may be diluted with air. The partial gelation may, in different embodiments, be carried out simultaneously with the conventional gelation by dissolving the mineral acid in the gelation liquid.

Abstract: An improved device for making plastic articles from resin and an improved runner block assembly for a mold for making plastic articles from resin have been made by providing a runner block assembly having at least one channel wherein the channel has a cross-section with two opposite sides having a length substantially less than the two other sides thereby forming a thin, flat channel sufficient to provide shear resistance resulting from forcing resin through the channel; means for connecting the channel to a plurality of mold cavities, and means for supplying resin to the channel.

Abstract: An injection mold comprising a fixed and a movable mold half and a demolding device for the moldings, which essentially consists of grippers and a kinematic chain, by means of which the opening movement of the mold half is transferable to the holders of the grippers. By this means, the opening movement of the mold half can cause the grippers to move towards the moldings to be taken out of the mold half.