Abstract: A mold for polystyrene has two spaced dies receiving the polystyrene therebetween. The wall of each die has two superposed independent chambers, one a heating chamber and the other a cooling chamber adjacent the die surface. Passages from the heating chamber pass through the cooling chamber and through the die surface and do not communicate with the cooling chamber. The opening of the passages in the die surface may be partially closed by nozzles.

Abstract: A method and apparatus for forming a continuous cooling liquid passageway through two separable injection mold dies when they are closed with a supply system flowing cooling liquid at a less than atmospheric pressure at least at the junction of the dies through the passageway only when the dies are closed and air when the dies are opened and the passageway is discontinuous.

Abstract: An improvement in the method of operating a molding apparatus for use in molding plastic and other materials is provided. The inner mold surfaces of the apparatus are flooded, during operation, with a dehumidified gas such as dry air to minimize condensation of moisture onto these surfaces. This dry air forms a field in the area of the mold surfaces to keep out the normally moist ambient air. The field is exhausted and recirculated to the supply source where it is regenerated and returned to the area of the mold surfaces. In this way, a continuous concentration of dry air is maintained in contact with the mold surfaces. One or more dry air curtains are also established around the dry air field to prohibit moist air from entering the field. The air curtain may be established from the same supply source as the dry field or from a separate source and may also be recirculated. A cloud of dry gas may be emitted outside of the air curtains to further inhibit the flow of moist ambient air to the mold surfaces.

Abstract: Apparatus for curing concrete of a type having a mold or plurality of molds disposed on a frame is characterized by having a forced air heating system which includes a mechanism for evenly distributing heat along the length of a concrete bed. The concrete bed has a plurality of molds thereon and an opening under the molds for receiving a heat distributing mechanism. A heater is attached to the heat distributing mechanism and an air circulating mechanism is provided for causing the heat from the heater to flow to the heat distributing mechanism. The heat distributing mechanism includes a first conduit attached at one end thereof to and in communication with the heater. The first conduit has side walls which are impervious to the flow of the heated gases and the other end of the first conduit is open. A second conduit is sealingly disposed around the first conduit and encompasses the other opened end of the first conduit.

Abstract: A method and apparatus for forming cured polyethylene insulation about high voltage cables by applying uncured polyethylene around a core of the cable. The polyethylene is heated, cured and then cooled to room temperature in a pressurized nitrogen gas atmosphere. In one form the molding apparatus comprises first and second mold forms which define a cavity and which include means for heating the mold halves to the polyethylene curing temperature. Means is also provided to introduce the pressurized nitrogen into the cavity and for subjecting cable portions that extend beyond the mold to pressurized nitrogen until such cable portions are sufficiently cooled to prevent their deformation under pressure, to prevent the oxidation of polyethylene and/or to prevent the formation of voids or enclosures.

Abstract: A press element for a disc record press which is heated and cooled by the passage of hot and cold fluids is made from materials of different thermal conductivity so that parts of a surface on which a matrix is attached in use which are further from a fluid channel are related to material of higher thermal conductivity than those parts of the surface which are nearer to a fluid channel.

Abstract: A mould assembly for producing multiple castings in which a plurality of mould components are closely arranged together in an array and define a plurality of mould cavities. At the base of the array there is provided a regularly shaped space which communicates with each of the individual mould cavities via a runner passage and thus molten metal admitted to the space fills each of the mould cavities simultaneously leading to uniform properties in all the castings. The individual mould components are preferably injected moulded in a ceramic material.

Abstract: A mold apparatus for forming a molded article comprising a hollow body of a crosslinked polymer rotationally molded around a section of at least one piece of non-crosslinked conduit, which conduits protrude from said hollow body, made by attaching said conduits of non-crosslinked material at the desired location to the mold with said section being located inside a heated section of the mold so that the crosslinkable polymer during a rotational molding process is fused and crosslinked inside of the mold and around and in tight welding-type connection with said section, whereas the remainder of the piece or pieces of uncrosslinked polymer are heat-insulated, thus avoiding deformation or collapsing of these pieces.

Abstract: A copper liner for a mold utilized in the electroslag refining process of a character to reduce thermal creep distortion and simultaneously increase the cooling effect obtained by circulating cold water, the liner being composed of copper and provided with a multiplicity of vertically disposed slots which may be straight or sinuous to receive cooling water, the structure between the slots dimensioned to function as cooling fins and at the same time structurally reinforce the mold liner to prevent creep.

Abstract: Plastic molding assembly having resistance to elevated temperatures in molding comprising a cooling chamber for flowing a cooling medium within the plastic mold body, a large number of metal radiating wires of good heat conduction and of easy plastic deformation being thoroughly buried within the plastic portion of such body, said metal radiating wires being positioned in such manner as to be in part in contact with the cooling medium within said cooling chamber.

Abstract: Air that becomes entrapped in a closed mold cavity during the injection of liquid plastic material into the cavity is vented into the flowing liquid coolant of the mold to be exhausted therewith while leakage of coolant into the mold cavity during nonventing is prevented by maintaining the coolant at less than atmospheric pressure.

Abstract: A mould for the electroslag casting of faceted metal ingots has longitudinal flutes on the internal surfaces of at least two walls thereof. The depth of these flutes decreases in a horizontal direction from the middle of the walls to the corners of the mould chamber.

Abstract: The two half sections of a battery grid mold are provided with means for cooling the portions of the mold sections directly adjacent the grid cavity and for heating the larger rear portions of the mold sections. The means for cooling the mold sections comprise a plurality of coolant passageways disposed forwardly of the vertical mid-plane of each mold section.

Abstract: A press plate for presses used in the manufacture of fibreboard, chipboard, laminarboard and the like, in which heating of the press plate is effected by passing a heating medium, such as hot water, hot oil or steam, through passages in the press plate. The press plate comprises a center section having longitudinal passages therein and two end pieces which are welded to the center section. There are cast passages in the end sections which may intersect each other in two-level crossings. Desirably, the passages in the end sections are provided with curves at the corners of the end pieces.

Abstract: A casting mold assembly is provided with improved facilities for preventing the generation of cleavages at the joints of successive plates that are arranged in a closed path about the mold axis to define the central mold cavity. A securing ring tightly engages the outer surface of the plates with the aid of a spring-loaded compression assembly, wherein a pair of spaced parallel legs that terminate the ring are forcibly pressed together by means of a disc spring that is mounted on the shaft of a threaded member and that is captured between the outer surface of one of the ring legs and a threaded nut that cooperates with the shaft. The resultant tightening of the joints between the plates that form the mold wall forms an impenetrable seal to prevent leakage of slag and other residues resulting from hot melts within the mold cavity.

Abstract: A hollow shaped article is formed from a preformed sheet of foamed thermoplastic material wherein a joint is formed along the length of two abutting edges of the preformed sheet at the sheet's surfaces but inwardly of the surfaces the abutting edges are left unbonded. The process for forming the articles is characterized by flexing the preformed sheet into the desired general shape, placing it into a two-part mold, and then heating it in two heating steps.

Abstract: A mold assembly for use in heat forming granular material into a discontinuous cross-sectional board. The mold assembly has an upper and lower frame and two mold halves forming a mold cavity therebetween. The mold halves are coupled to the frame by means of spacer bars. The spacer bars are designed to minimize conduction of heat from the mold to the frame and are positioned over peripheral heaters in the mold to minimize heat gradients within the mold. In addition, the spacer bars minimize heat distortion of the frame members. The interior of the mold is provided with a first array of heaters extending parallel to the longitudinal axis of the mold near the surfaces of the mold halves remote from the mold cavity. A second array of heaters extend through the mold halves parallel to the longitudinal axis of the mold adjacent the surfaces of the mold cavity. The heaters in the first and second array are independently controlled to maintain a constant temperature through the cross-section of the mold.

Abstract: A cooker assembly for use in heat forming a discontinuous cross-section of mold extruded granular material. The cooker assembly has two frames pivotally connected at one end. A pair of hydraulic cylinders are interconnected between the frames for moving the two frames between opened and closed positions. The upper frame has a planar surface for engaging the upper surface of the material as it leaves the mold and is provided with longitudinal heaters for heating the materials as it passes through the cooker assembly. The lower frame has an uneven contoured surface closely approximating the lower surface of the material as it is extruded and heaters extending longitudinally therethrough for heating the material as it passes through the cooker assembly.

Abstract: A continuous slab casting mold plate formed of an inner face plate fastened face to face to an outer backing plate, and having curved side edges. A number of narrow, parallel grooves are formed in the surface of the face plate, with the grooves covered by the adjacent backing plate surface. The grooves are curved to correspond to the arc of curvature of the plate side edges. A shallow pocket is formed in the backing plate surface at each of the groove ends so that each pocket overlaps all of its adjacent groove ends. A water-carrying passageway through the backing plate communicates each pocket to the exposed backing plate surface for thereby, circulating cooling water through the grooves for continuously cooling the face plate.

Abstract: Molding apparatus for forming an article out of heat-softenable polymeric material, the molding apparatus comprising a mold including a mold cavity and a core insertable into said cavity to define a molding space of the configuration desired in a molded product for receiving the heat-softenable polymeric material, the core being made of heat-conducting material, means, normally including a steam chest in thermoconductive relationship to the mold, for heating the mold, means for admitting into the molding space heat-softenable polymeric material for forming the article and means for conducting steam from the steam chest into the mold cavity to aid in forming expanding and the heat-softenable polymeric material into an article having the shape of the molding space, the last mentioned means comprising at least one duct having a cross-sectional area not greater than 0.001 squre inch, preferably 0.

Abstract: A molding apparatus for thermoforming plastic sheet material having upper and lower matching molding blocks, each molding block having a thin rigid shell. The shell has a die cavity therein with the exposed face of the shell defining the die cavity surface. A porous body of metallic filler material is contained within the central portion of each molding block and is in contact with the inner surface of the rigid shell. Inlet and outlet means are provided for circulating a coolant fluid through the central portion of each molding block.