Abstract: A mold structure for press molding, including an upper mold member and a lower mold member in a sleeve member in longitudinally slidable manner. The mold includes a member for limiting the movement of the lower mold member with respect to the sleeve member in a direction in which the lower mold member is separated from the upper mold member, and a ring member mounted on the upper end face of the sleeve member. The ring member is provided, in the longitudinal direction of the sleeve member, with at least three penetrating holes in which pins with same length are detachably inserted, and the upper mold member has an impinging face to be brought into contact with the pins in the pressing operation, thus determining the thickness of the molded article.

Abstract: A technique is provided for forming an article having a sharp, detailed edge by thermoforming thermoplastic resin prepregs containing randomly arranged reinforcing fibers and ordered, substantially continuous reinforcing fibers. The thermoforming mold used for this technique has a mold cavity with a wedge-shaped interior portion and a mold plug with a wedge-shaped exterior portion wherein the mold plug is capable of applying additional pressure along its edge section. The randomly arranged reinforcing fibers are utilized to form the sharp edge portion of the resulting article while the ordered, substantially continuous reinforcing fibers are utilized to form the remaining wall portions of the resulting article.

Abstract: This invention is a novel mold-pressing apparatus for molding and pressing a material, which is provided with an electric servo motor and a pair of linking mechanisms. The electric servo motor drives the mold-pressing apparatus and rotates itself in the normal and inverse directions. The electric servo motor is numerically controlled. The driving force from the electric servo motor is transmitted to the pressing mold via the linking mechanism by a rotation to reciprocation conversion assembly. By virtue of the provision of these, the mold-pressing apparatus can very easily and effectively secure the applicable pressure and adjust the pressure-applying speed, stroke of the pressing mold, and the pressing time so that the mold operator can create a comfortable environment and improve overall efficiency of the pressing operation.

Abstract: An apparatus is disclosed that engages a lid to a container by the formation of interlocking waves of lid material and container material. The interlocking waves are geometrically aligned relative to the interior of the container so as to maximize the burst strength of the container, and also to minimize the force required to peel the lid from the container. An unheated clamp head of the apparatus is used to clamp the lid structure immediately adjacent a heated seal head used to form the interlocking wave structure about the inside rim of the container, so as to prevent any melted portions of the container or lid from flowing to or toward the outside rim of the container, so as to prevent the formation of similar interlocking waves about the outside rim of the container.

Abstract: A thermoplastic sheet is placed between a pair of mold members each having a thermal insulator and a mating metal mold insert. RF energy is applied to the inserts to dielectrically heat and melt the thermoplastic sheet. The heated sheet is then deformed in a low pressure press with the insulators. The insulators are then replaced with cool thermally conductive structures to shorten the cooling cycle time. The thermally conductive structures cool the sheet by pressing the sheet in a high pressure press.

Abstract: A composite-material structure of T-shaped cross section has a horizontal plate and an integral vertical web. The vertical web is formed between opposite forming faces of die members, and the horizontal plate is formed between the die members and a horizontal pressing plate positioned above or below the die members. In order to urge the die members against each other for forming, wedges are provided. The die members, pressing plate and wedges are placed between a lower stationary part and an upper movable part of a pressing machine. When the movable part descends towards the stationary part, the wedges exert forces to the die members to urge the members toward each other due to a wedge action, and the pressing plate is vertically urged against the die members.

Abstract: A cast mold and process for casting a substrate for an information recording medium has an uneven preformat pattern formed on the mold surface. The uneven preformat features a pattern corresponding to tracking grooves and information pits, each information pit portion has a size with a length b in the direction parallel to the pattern of the tracking groove of 2 to 15 .mu.m and a width a in the direction perpendicular thereto of 1 to 6 .mu.m and a height c of 300 to 3500 .ANG.. The pit pattern has a pitch which is 1.8-fold or more of pit length b.

Abstract: Particle board, hard board, wafer board, plywood and the like are formed by vapor injection pressing using thin plates through which steam is injected into the product under consolidation, the thin plates lying adjacent the press platens. For closed steam pressing, the plate is provided with a peripheral seal which is inflatable to seal the cavity of the press using either the same stream which is injected into the product, or a second source of steam or other gas at a higher pressure.

Abstract: A high tonnage reaction injection molding (RIM) press has fixed and movable platens for clamping a composite mold therebetween at a closed mold position. A plurality of high pressure hydraulic cylinders are mounted on a carrier for the movable platen, and a locking mechanism having a plurality of incrementally spaced locking positions is effective to lock the carrier selectively at said positions. A pair of low power hydraulic piston-cylinder assemblies connected with the carrier adjacent to its opposite ends move the carrier and movable platen to the closed position. Short stroke connecting rods operated by the high pressure cylinders are forced independently of each other into high tonnage engagement with the movable platen at a plurality of locations within the area of the composite mold to clamp the latter between the platens and positively seal its junctions, whereupon a RIM mix head injects the high pressure reactive chemicals into the sealed mold.

Abstract: Apparatus and method for forming seals, such as composite seals in rubber/metal or other materials, includes supplying a raw elastomeric mixture in the form of a suitably shaped extrusion, and optionally a metal or other material insert, to respective loading and a possibly metal or other material insert are supplied to respective loading stations of a transfer machine; the machine is provided with a plurality of carriers each composed of at least two pivoted leaves joined in book-like fashion and each carrying a respective mould half, respective spring presses movable on the machine together with the said carriers, and cam means for holding the said carriers open at the loading stations; after cleaning of the mould halves and spraying of the upper mould half with a release agent a said insert is deposited between the mould halves by means of manipulators able to self-center themselves with respect to each carrier and then a blank of raw mixture obtained by slicing the extrusion is deposited between the mould

Abstract: A hot press for heat forming a disc pad including a pair of presses arranged vertically and in opposition to each other, a support for coupling the pair of presses with each other, a base fixed in a vertically intermediate portion of the support, first heat plates interposed between respective rams of the presses and the base through first adiabatic members respectively so as to be movable up and down vertically together with the rams of the respective presses, second heat plates provided on opposite sides of the base through second adiabatic members respectively, molds respectively inserted between one pair of the first and second heat plates in opposition to each other and the other pair of the first and second heat plates in opposition to each other, each of the molds including a lower mold, and an upper mold fitting into the intermediate mold in which friction material is put, and springs for keeping a predetermined distance to between the springs and the intermediate molds.

Abstract: A resilient sheet of material is used between a cavity plate and a mold base in a sytem used to encapsulate items such as semiconductor devices. The resilient sheet of material compensates for any dimensional variations in the cavity plates. In addition, compensation is also made for dimensional variations of the item being encapsulated. In one embodiment, the sheet of resilient material is used to seal cavity openings in the cavity plate. A method for the use of such an arrangement is also provided.

Abstract: A method of making a high load tool having a hard body of plastic material with compression plates on opposites sides to compress and strengthen the body. The method includes the steps of inserting passage forming pipes into a container and retaining the passage forming pipes in predetermined locations. Epoxy resin is poured into the container to cover the passage forming pipes and then the epoxy resin is cured. Elongated rods are inserted into the passage forming pipes and a pair of load spreader plates are placed at opposite ends of the elongated rods. Threaded bolts are advanced on at least one end of the elongated rods to move the spreader means towards one another and to compressively load the body.

Abstract: A cast mold and process for casting a substrate for an information recording medium has an uneven preformat pattern formed on the mold surface. The uneven preformat features a pattern corresponding to tracking grooves and information pits, each information pit portion has a size with a length b in the direction parallel to the pattern of the tracking groove of 2 to 15 .mu.m and a width a in the direction perpendicular thereto of 1 to 6 .mu.m and a height c of 300 to 3500 .ANG.. The pit pattern has a pitch which is 1.8-fold or more of pit length b.

Abstract: In a press, a platen has opposed fluid, preferably hydraulically, actuated clamp blocks thereon. Each block functions to register with an open-ended slot in a tool mount plate and upon translation of the block to enter an offset slot section in a clamped or locked relationship. The offset slot sections are opposed one another, wedge-shaped, and complementary to block configuration. The tool mount plate can be quickly and conveniently attached and aligned or removed from the platen as needed.

Abstract: A device for reducing a dimension of an expansile hydrogel intraocular lens having an optic portion including two plate members for supporting the lens in a compressing chamber and actuateable towards one another to apply a compressive force to the optic to simultaneously dehydrate the lens and to reduce the cross sectional dimension of said lens to a dimension less than the maximum cross section in the hydrated state.

Abstract: Epoxy tooling which inherently expands and contracts with temperature changes for making parts of metal or plastic has elongated rods extending through guide tubes within the tooling and compression washers or plates on opposite sides thereof. These compression devices for strengthening the tool can be selectively adjusted toward and away from one another using nuts threaded on the rods for varying the compression load on the tooling in accordance with varying tool operating loads, working temperatures and amounts of expansion or contraction. Epoxy tools for molding plastics are heated and expanded to a working temperature and then compressively loaded in selected areas prior to molding operations to prevent tool stress cracking or epoxy tools for metal stamping are compressively loaded and supported in selected areas of high tensile stress and operated at room temperatures for high load metal stamping without fracture.

Abstract: Press tools are used for processing plastics, in particular fiber-reinforced plastics, to moldings in presses. They essentially consist of a lower part which can be firmly connected to the press frame and an upper part which is movable with respect to the said lower part and can be connected to a frame drive. The upper and lower parts of the tool, together with drive elements for driving together parts which define the mold cavity, form a basic unit. The parts are replaceably held in the basic unit and are guided in the said unit.

Abstract: In accordance with the instant invention, biaxially oriented polymer sheet is produced by continuously forging polymer feedstock between a pair of converging belts in an isochoric deformation region to form the sheet from the feedstock. The resulting sheet is immediately annealed after being formed and subsequently cooled after being annealed by passage through an isobaric region defined by a pair of opposed parallel belts backed by a pair of opposed parallel platens which interface with the belts via an oil seal so as to transfer heat from the sheet through the belts to the cooled platens. The resulting sheet has substantially uniform strain distribution over the width and length thereof as well as through the thickness thereof while maintaining its flatness after emerging from the apparatus.

Abstract: A press, especially for the manufacture of die-formed parts of dimensional accuracy made of powdered materials is described, which can be equipped and used interchangeably either for the use of the so-called smoothing process or the so-called plunger process. It includes a press support 103 on which a fixed press bed 104 and a vertically slidable press frame 105 are mountred for movement relative to each other by a mechanical drive, preferably a toggle linkage 106, to form a main press ram. Further, it has a bottom ram passing upwardly through the press bed 104 which serves as a smoothing ram or a plunger ram, being operated for both purposes by a double-arm lever 123 pivoted on the press support and actuated by a rock lever 133 likewise pivoted on the press support 103 and having a sliding pivoting connection to the double-arm lever 123.

Abstract: Apparatus for forming elongate laminate into a predetermined configuration having a substantially uniform cross-sectional shape in the axial direction, including a plurality of roller pairs having complementary transverse peripheral profiles, plate members disposed between the roller pairs and the laminate and having a transverse configuration corresponding to the peripheral profiles of the rollers.

Abstract: A press for producing dimensionally stable moldings from powdered materials is described whereby a press frame and a press platen are provided in a press body and are linked together in movement by means of a drive and form a main press plunger. A hydraulic press part with at least two additional press axes is mounted in front of the main press plunger between the press frame and press platen. The second hydraulic press axis of hydraulic press part is actuated and controlled by its first axis through a hydraulic coupling device that has a variable transmission ratio, while the first axis of the hydraulic press part is in turn actuated by the press frame of the main press plunger. The movement ratios of the second press axis of the hydraulic press part can then be varied relative to the main press axis.

Abstract: In accordance with the instant invention, biaxially-oriented polymer sheet is produced by continuously forging polymer feedstock between pairs of converging opposed surfaces. After it is biaxially-oriented, the sheet product is either cooled or heated while being restrained and advanced. The sheet produced by the process and apparatus has substantially uniform strain distribution over the width and length thereof as well as through the thickness thereof.

Abstract: A molding process of a molding compound containing an ingredient such as a binder, e.g., pitch or a thermosetting resin which generate gas before being set, is disclosed, wherein the molding compound is heated and molded under pressure according to a special temperature pattern. First, the molding compound may be preheated substantially uniformly to a temperature at which the binder melts and generates reaction gas. Next, temperature gradient in the direction of thickness of the molding is created while raising the temperature of the molding to an upper limit temperature so that the setting of the molding progressively advances from the higher temperature to the lower temperature side of the molding.

Abstract: A pair of mold bases are provided, each of which possesses a nest-mold insert hole which is open in one direction perpendicular to the mold-closing direction and capable of receiving a plurality of nest molds.The plurality of nest molds, with contacting wall faces between adjacent members, are inserted into the insert hole of each mold base from the open side of the insert hole. In order that the nest molds will not slip in the mold-closing direction, a wall-face engagement is applied between the nest molds and the inner wall of the insert hole and between the nest molds themselves. Mutually corresponding nest molds on both the mold bases, except substitute nest molds, form the cavity for molded products.The nest molds put in the insert hole are fixed by being pushed by a fixing device from the open side of the insert hole.

Abstract: Device for manufacturing stones, provided with a frame, with a mould having boundary walls defining moulding rooms inside the mould, with a stamp movable up-and-down arranged above the mould and with a table arranged under the mould. Filling pieces are movable between a first position, in which they are located under the mould and whereby, see in top view, at least parts of the filling pieces project from the walls for forming recesses, and a second position, in which the filling pieces are located beside the mould, seen in top view. Extensions are connected to the filling pieces, those extensions being movable forward and backward and co-operating with guide means for guiding the filling pieces, whereby the extensions project from the mould in the first position.

Abstract: A press apparatus and method for steam pressing a mat of compressible material and a binder into a formed product and has particular application to the steam pressing of lignocellulosic material and a binder to form composite board and includes a border projection means generally configured to the outline of the end product to be produced and which is carried by a press platen, preferably the upper press platen, and which is intended to impinge into the mat during its compression and to effect a steam pressure seal at the impingement area of the mat. As a pressure seal of the compressed mat is created about the mat edges, steam can then be passed through the mat in order to cure the binder. If desired, cool air can be passed through the mat afer steaming to condense residual steam in the mat. The compressed mat after steaming, can also be subject to vacuum prior to releasing it from the press. The edges of the cured mat which have been subject to impingement, can subsequently be trimmed off.

Abstract: Spring-loaded rollers for a mold have an axle mount which passes through the roller into a supporting portion of the seats in the platen to prevent the roller from rotating, twisting or otherwise moving in the set, thereby reducing wear in the roller assemby and in the mold. The roller assembly is easily removed from its seat through the use of a removal device cooperating with screw threads in the roller. A plurality of rollers are used to permit a mold to be easily moved into and out of position in a press. The mold is thus mounted in position since the rollers limit the ability of the mold to move laterally.

Abstract: A press has upper and lower platens which can be moved towards and away from one another. Four hydraulic leveling cylinders are mounted in a vertical orientation on the lower platen for purposes of platen parallelism control. In preferred form, each cylinder has a piston rod which engages an associated post on the upper platen as the platens approach one another. The piston rod and associated piston are formed with a longitudinal bore open at the upper piston rod end, and a rigid shaft is mounted in the bore with a lower end extending through the bottom of the cylinder housing. A coil spring in the interior of the piston rod urges the rigid shaft upwardly until a collar formed on the shaft engages a stop surface, the upper shaft end then being flush with the upper piston rod end. The associated post is fixed to the upper press platen in-line with the piston rod and has an internal passage in which is located a stud-like shaft that engages the rigid shaft mounted in the piston rod.

Abstract: A sintering press for comprising a stack of foils is formed of a lower die, an upper die opposing the lower die and a furnance surrounding the dies. At least one of the two dies is supported at its end face remote from the other die by a spherical bearing surface so that this die can adjust itself by tilting so that the center lines of the two dies are no longer in line with each other. As a result, a uniform pressure distribution is obtained on the stack of foils.

Abstract: Spring-loaded rollers for a mold have a sealed axle mount which passes through the roller into a supporting portion of the seats in the platen to prevent the roller from rotating, twisting or otherwise moving in the seat in the roller assembly and in the mold. The roller assembly is easily removed from its seat through the use of a removal device cooperating with a threaded aperture extending through the roller to the axle. This also permits lubrication to be placed between the roller and the axle. A plurality of rollers are used to permit a mold to be easily moved into and out of position in a press. The mold is thus mounted in position since the rollers limit the ability of the mold to move laterally. The seals are dished TEFLON disks which overfit the axle and interfit either against the sides of the roller or within slots cut circumferentially on either side of the roller. The walls of the slot may be undercut and/or otherwise shaped.

Abstract: An apparatus is disclosed which facilitates rapid insertion, removal and exchange of a fixture in situations where it must be securely attached to a support surface before or after removal from such surface. The fixture has a plurality of studs extending outwardly therefrom which guide the fixture tool through channels in a support surface and into placement in respective slots of T-slot clamps which are moved by fluid pressure to the open position, the fixture transferred, and the fluid pressure released to effect clamping. The present invention can be used in a high production manufacturing system such as a press or molding operation and is particularly useful in thermoforming operations.

Abstract: A method of and apparatus for pelletizing a radioactive waste powder is disclosed. The apparatus includes a pelletizing section, and a pelletizing die which has one end facing a powder receiving cavity formed in the pelletizing section and the other end exposed to the atmosphere, and a through bore is so formed in the die as to pass from the one end to the other end. A first pelletizing rod can be inserted into and pulled out of the through bore from the one end of the die through the cavity, and a second pelletizing rod can be inserted into a pulled out of the through bore from the other end of the die. The first and second rods are arranged such that, when the second rod takes a predetermined position in the through bore, the first rod is inserted through the receiving cavity into the through bore, thereby enabling the pelletizing operation of the powder within the through bore.

Abstract: Spring-loaded rollers for a mold have a sealed axle mount which passes through the roller into a supporting portion of the seats in the platen to prevent the roller from rotating, twisting or otherwise moving in the seat in the roller assembly and in the mold. The roller assembly is easily removed from its seat through the use of a removal device cooperating with screw threads in the roller. A plurality of rollers are used to permit a mold to be easily moved into and out of position in a press. The mold is thus mounted in position since the rollers limit the ability of the mold to move laterally. The seals are dished TEFLON disks which overfit the axle and interfit either against the sides of the roller or within slots cut circumferentially on either side of the roller. The walls of the slot may be undercut and/or otherwise shaped. The invention makes it very easy to move the heavy molds into and out of the press thereby reducing operator fatigue.

Abstract: A mold closing unit for an injection molding machine has an exchangeable injection mold assembly; a mold exchanging device; a conditioning table situated adjacent a clamping space of the mold closing unit; and a supply line coupling for connecting to and disconnecting from, one another conduit terminals of mold-side supply conduits and machine-side supply conduits. The supply line coupling is formed of a mold-side coupling half fixedly attached to the mold body and a machine-side coupling half arranged to be movable between the conditioning table and the clamping space. The mold-side coupling half and the machine-side coupling half are joinable to and disconnectable from, one another along a horizontal parting plane of the supply line coupling for joining the machine-side and mold-side conduits to one another for preheating the injection mold assembly on the conditioning table.

Abstract: A mold closing assembly having two platen supporting bodies or turrets mounted on a base to pivot in a generally horizontal plane about two vertical pivot axes. At least one platen reciprocates linearly to clamp the mold sections together, and a tie bar extends above the two turrets between the pivot points. Preferably the mold closing assembly has a modular construction.

Abstract: A stack mold having a pair of mold halves movable toward and away from another along an axis of movement and in which a plurality of mold plates are arranged parallel to one another between the mold halves and parallel to the axis of movement of the mold halves. This arrangement of the mold plates enables a larger number of large, thin parts to be simultaneously molded in a given size press than is possible in the prior art. Further, the mold plates are formed with hangers which support the mold plates on the mold halves, enabling different mold plates to be easily substituted without disassembling the mold structure and slides, and also eliminating the need for guide pins or pillars for the mold plates. The mold plates are supported on program plates having guide surfaces thereon for determining the opening and closing sequence of the mold plates during opening and closing movement of the mold press, and the central portion of the endmost mold plates is wedge-shaped.

Abstract: Method and apparatus for forming tooth positioners. The apparatus includes a pair of aligned model mounts which are relatively movable toward each other, a holding member between the mounts having a cavity for a positioner blank, a heating element embedded in the holding member, and a sandwiching pressure applicator. Preferred embodiments include a carrier member with which the holding member is removably engageable. The method includes heating the holding member by applying heat internally to it and applying sandwiching pressure to the blank, preferably concurrently.

Abstract: Plastic molding apparatus including a horizontal molding press with two platens and a mold having an ejector mold half and a cover mold half that form a mold cavity, each mold half being secured to a platen with at least one platen movable horizontally relative to the other platen to and closed positions. The molding press has longitudinal rails along the top thereof parallel to the direction of relative movement of the platens. There is an elongated horizontal gantry structure supported solely by the press and movably secured to the rails with the longitudinal axis of the gantry structure being oriented normal to the rails and the gantry is movable along the rails. There are two arms, one of which depends from one end of the gantry and the other depends from the opposite end of the gantry, and these arms are movably secured to the gantry for back and forth movement along the longitudinal axis of the gantry.

Abstract: Hydraulic press including a frame with platens, at least one of which is carried or formed by a pressure plate structure adapted for transferring pressing force to an object between the platens, which press is adapted such that the pressure plate structure is substantially carried solely by horizontally adjustable supports mounted between the defining outer edges of such plate structure, such supports being positionally adjustable such that the surface of the corresponding platen assumes a predetermined shape during the pressing operation. The press suitably includes a mechanical mechanism for effecting the horizontal displacement in order to gain the desired positional adjustment of the supports.

Abstract: A device suitable for molding ophthalmic lenses comprises two spaced mold parts in face-to-face relationship inside a cylindrical sleeve. One or both parts comprise a rigid supporting base, a molding die of an elastically deformable material and an intermediate pad of an incompressible elastic material disposed between the base and the die and completely covering their respective surfaces.

Abstract: Coated sheet molding compound (SMC) parts are produced by transferring mold devices between a main press and at least one auxiliary press and by completing the compressing and curing of the coated SMC parts during the transfer of the molds. In the main press the SMC sheet is compressed and cured to be formed into a desired shape, and the formed SMC part is coated in the mold, and in the auxiliary presses the other operation such as charging the SMC sheet, closing and opening the mold, removing the part, and the like are performed. Between the adjacent main press and auxiliary presses are means for transferring the molds between the respective presses. Levelling devices are provided associated with the molds for supporting the upper mold parallel to the lower mold, and during the transfer the coated SMC part is further compressed and cured in the mold by suitably controlling the levelling devices. This method can be sufficiently applied to mass production systems such as automobiles or the like.

Abstract: A hot isostatic pressing apparatus equipped with at least one hot isostatic pressing vessel having a detachable bottom lid and at least one cooling or preheating cylinder or hot isostatic pressing vessel arranged substantially on a central horizontal extension of the former vessel, which apparatus includes a rail provided in front of the former vessel and cylinder or the latter vessel with an interval between the rail and the former vessel and the cylinder or the latter vessel; and a carrier capable of reciprocally travelling between the former vessel and the cylinder or the latter vessel and including a lift frame, a lift provided with the frame and a bottom lid cradle, the cradle being provided in the form of a cantilever with lift and extending to a point underneath the former vessel when the carrier assumes a position in front of the former vessel and to another point underneath the cylinder or the latter vessel when the carrier assumes a position in front of the cylinder or the latter vessel.

Abstract: Apparatus for making a soundproof lining for a gas pipe, in particular for a turbojet fan jet, of the type including a multiplicity of thin, perforated panels juxtaposed by tiling, as well as an intermediate layer between the wall of the pipe and each of said panels to delimit with said perforated panel a multiplicity of resonant acoustical cavities in which the acoustical vents consist of the ports in the perforated panel. According to the invention, in order to make the tubular vents, each perforated panel has a short, tubular sleeve at right angles to each port and located on its face opposite the wall of the pipe.

Abstract: A hydraulic press of the type having first and second oblong side plates joined at upper and lower ends thereof to form a structure supporting upper and lower hot plates and injection molding equipment in which one of the side plates includes channels formed in its interior for conveying hydraulic fluid from a source of fluid under pressure, through valves mounted on the side plate, to and from the hydraulic equipment, and back to a reservoir.

Abstract: A conventional conduction pressing apparatus for consolidating of composite products by pressure and heat is converted to a press in which heating is carried out by convection. This is accomplished by providing caul plates for use on the working surfaces on the press plattens, the caul plates having a central permeable area and a peripheral impermeable area, as well as appropriate sealing elements. Holes are drilled through the press plattens in order to provide a passageway for steam from an outside source to the central permeable areas of the caul plates.

Abstract: A method and apparatus for manufacturing plates of thermoplastic synthetic material or the like by compression molding is disclosed, wherein a mold comprising a respective, horizontally, disposed upper and lower part is first filled with synthetic base material in granular form or the like, is subsequently heated while being pressure-charged and closed for the purpose of melting the synthetic base material.

Abstract: Apparatus for encapsulating electronic components in plastic includes a press with upper and lower press members, upper and lower flat plastic carrier plates, and transfer injection means. The plates from a closed cavity and support the electronic component.

Abstract: Am improved press for molding ceramic material which has a base frame on which a first carrier is rigidly mounted and which fixedly supports a stationary punch. A stripper platen is slidably movably supported on said first carrier and is adapted to be reciprocated therein by third piston and cylinder means mounted in said first carrier. The stripper platen includes an annular chamber disposed around the stationary punch for receiving granular ceramic material from a hopper mounted in the base frame. A second carrier is also rigidly mounted in the base frame and supports first and second cylinder and piston means. The first cylinder and piston means serves to support a movable punch which exerts the main molding pressure on the ceramic material when the stationary and movable punch are in the molding position. The second cylinder and piston serve to move the movable punch towards and away from the stationary punch and to exert supplemental pressure on the movable punch during the molding process.

Abstract: A video disc is molded in an apparatus which includes a pair of opposed mold members each having a mold cavity in its surface which faces the other mold member and a stamper is mounted across the mold cavity in each of the mold members. Each stamper has on its surface a surface relief pattern arranged along a spiral path. The stampers are arranged on the mold members so that any imperfections in the mold members which may pass through the stampers and be impressed on the disc being molded are aligned with areas of the stamper which do not contain information which impacts the picture quality so that such imperfections are impressed in areas of the disc which will not adversely impact the perceived picture quality during playback of the disc.