Abstract: The invention relates to a method for producing molded parts, wherein semifinished product is heated in a heating device and is subsequently fed to a shaping machine. The heating device has a closed housing having a door or has a separately closable opening. The heating device optionally has a dividable housing, in the case of which the housing components can be moved away from each other in order to form an opening and can be moved toward each other in order to form a closed housing. One or more radiant heaters, in particular infrared radiant heaters, are provided in the interior of the housing. Semifinished product is introduced into the interior of the housing and radiant heat produced by the radiant heaters is applied thereto, said semifinished product is heated, and said semifinished product is subsequently removed from the housing. Thermal convection, which is directed substantially upward in the housing, is produced in the interior of the housing.

Abstract: This invention relates to a process for controlling a dental firing furnace in which a temperature in a firing chamber of the dental furnace is detected by means of a temperature sensor, and in which a heating element that is controlled by a control device controls the heating of the firing chamber of the dental firing furnace based on the measurement result of the temperature sensor. In this process a dental restoration part is received within the firing chamber of the dental furnace. The heating is controlled so that the dental restoration part reacts exothermically, emitting additional heat. The additional heat is detected by the temperature sensor which is pointed at the dental restoration part and the control device delivers at least one signal representing the additional heat, such as in the form of a display signal and/or control signal.

Abstract: A resonant power supply (900) for use with high inductive loads includes an input rectifier (903) and a switching inverter formed using a plurality of parallel connected half bridge networks for switching the voltage provided from the input rectifier (903). A transformer (927) is used whose primary is connected to the switching inverter and whose secondary is connected to load such as a crucible (931). A capacitor (929) is used in series with the primary of the transformer (927) for resonating the inductance in the secondary circuit at the frequency of the switching inverter to provide maximum power transfer to the crucible (931).

Abstract: An electrical sleeve heater for heating an elongated part has a metallic and tubular casing extending coaxially along an axis with the part and surrounding the part. The casing has a front end is with a radially inwardly open cutout. A electrical heating element set in the casing is energizeable to heat the casing and the part surrounded by the casing. A thermocouple has a sensing tip in the cutout. A retaining body of at most low thermal conductivity is fitted in the cutout, holds the tip out of contact with the metallic casing, and urges the tip radially inward into direct engagement with an outer surface of the part. The retaining body is a molded part, a plate, or a spring of a material with low or negligible thermal conductivity.

Abstract: A heating system includes first and second heating devices, a temperature sensor, a first controller and a second controller. The first and second heating devices are respectively arranged above a crucible and around the crucible for heating semiconductor material in the crucible. The temperature sensor is configured to detect the temperature of the first heating device and to generate a temperature signal. The first controller is configured to control operation of the first heating device so as to adjust the temperature thereof based on the temperature signal. The second controller is coupled to the second heating device and is configured to control operation of the second heating device so as to adjust the temperature thereof, based on an external control signal.

Abstract: The invention relates to a furnace for a dental prosthesis, or a partial dental prosthesis, comprising a furnace chamber, a plurality of heating elements for heating the furnace chamber, and a power connector for connecting the heating elements to a power grid, wherein means for limiting the power consumption of the furnace are provided in order to increase the application possibilities and improve the furnace performance.

Abstract: A fondue set includes a plurality of utensils, a removable heating vessel for holding a liquid to cook or coat food items, and a fondue stand for holding the heating vessel and the utensils. Each utensil has a food attaching portion for holding a food item. The fondue stand includes a lower portion having a central cavity sized and shaped to hold the removable heating vessel, and an end opening that allows the removable heating vessel to be placed within the central cavity. The stand also includes an upper portion configured to hold the plurality of utensils. The upper portion has a top opening that allows the food attaching portion of the utensils to be placed into the heating vessel.

Abstract: The invention relates to a furnace for a dental prosthesis, or a partial dental prosthesis, comprising a furnace chamber, a plurality of heating elements for heating the furnace chamber, and a power connector for connecting the heating elements to a power grid, wherein means for limiting the power consumption of the furnace are provided in order to increase the application possibilities and improve the furnace performance.

Abstract: An apparatus and method for dispensing controlled precise amounts of a hot-melt adhesive. A positive displacement dispenser which is mounted on a programmable motion system is connected to a hot-melt cartridge feed assembly by an inlet block. The dispenser, feed assembly, and inlet block contain electric heaters and thermocouples for maintaining the adhesive at a desired elevated temperature. A computer control system regulates the temperature in the dispenser, feed assembly, and inlet block and controls a dispensing motor in the dispenser. A preheater heats an adhesive cartridge prior to placement in the feed assembly.

Abstract: An apparatus and method for dispensing controlled precise amounts of a hot-melt adhesive. A positive displacement dispenser which is mounted on a programmable motion system is connected to a hot-melt cartridge feed assembly by an inlet block. The dispenser, feed assembly, and inlet block contain electric heaters and thermocouples for maintaining the adhesive at a desired elevated temperature. A computer control system regulates the temperature in the dispenser, feed assembly, and inlet block and controls a dispensing motor in the dispenser. A preheater heats an adhesive cartridge prior to placement in the feed assembly.

Abstract: A method and an apparatus for the programmed temperature control of a heating barrel provides for programmed temperature control in which a thermal sensor can be set selectively in either or any of plural sensor holes on the feeding zone of the heating barrel. By sensing the temperature at the most appropriate position with in the feeding zone, the molding injection is adapted to various resins with different properties, preventing clogging of resin in the heating barrel and changed color of molded articles.

Abstract: A ladle preheating system and method in which heat input rate to the ladle is calculated and monitored throughout the preheating period, calculating the moving average slope representing change over time of the rate of change of heat input, correcting the moving average slope for unavoidable variations in the measurements of the heat input rate, calculating the change of the moving average slope over time (the approximate second derivative), and signaling to an operator the readiness of the ladle based upon this second derivative's falling below a preset criteria indicating a fully preheated ladle.

Abstract: An apparatus for liquifying and supplying thermoplastic material including a melting hopper having a plurality of separately controlled heating zones. The hopper is formed of thin, rolled metal having a relatively low heat conductivity, such as carbon steel. Heaters are located along the length of the hopper and are separately controlled by way of thermostats or temperature sensors, such that the heat applied in a nonuniform manner to the thermoplastic material in the hopper during various stages of the melting and dispensing process.

Abstract: In an electric furnace including a heating device which includes a cooling water passage for cooling the heating device to prevent the heating device from melting, estimation of a molten metal temperature in the electric furnace using a heat equilibrium model is conducted taking into account a thermal loss by the cooling water, i.e., the amount of a heat taken away by the cooling water. Further, the amount of the cooling water flowing through the heating device is adjusted so that the thermal loss by the cooling water is in a predetermined optimum thermal loss range.

Abstract: A low wattage device for heat-liquefying material is described which employs a low volume mass electrical heat exchanger structure to generate a high power density within a dispensing tip; and simultaneously by actuation of an operator controlled momentary on/off switch for energizing the heat exchanger structure heater, the heat-liquefiable material is pressed into effective contact with the heat exchanger structure. The heat exchanger structure is formed by positioning a resistive heating element in contiguous relation to the outer wall of a low volume thermal conducting mass formed into a heat-liquefying material conductor and generates sufficiently high heat at a relatively low wattage to effectively achieve the desired melting within a few seconds. In a further feature, an insulating shield partially envelopes the heat exchanger structure to prevent contact with the resistive heating element and to minimize heat loss.

Abstract: A method of resistance heating using a graphite container having a graphite body and a pyrolytic boron nitride coating in which a metal charge of predetermined weight is deposited over the coating and the container is heated by the application of a variable source of electrical power to cause the metal charge to fully evaporate in a short interval of time of less than two minutes with the heat cycle controlled to provide a cool down period in each cycle of applied power and with a new metal charge introduced upon completion of each heat cycle in a semi-continuous fashion.

Abstract: Apparatus for melting and heating shortening includes a housing having a top, a bottom and sidewalls; a heating grid mounted in the housing and spaced above the bottom thereof for melting shortening and allowing melted shortening to pass therethrough toward the bottom of the housing. A door is mounted to the housing for introducing a block of shortening onto the heating grid. A bottom heater is mounted adjacent the housing bottom for maintaining the melted shortening at a desired temperature. A control circuit maintains control of the operation of both the heating grid and the bottom heater in a predetermined fashion for initially melting a block of shortening introduced onto the heating grid while substantially preventing smoking of the same, and for maintaining melted shortening at the desired temperature.

Abstract: The disclosed roller applicator, for applying a coating of molten wax or the like on paper or the like, has a bowl in which wax is melted and heated to a high working temperature by an electrical heating resistor under the thermal control of a first thermistor, directly in series with the resistor across AC power conductors. The thermistor, when heated to the working temperature, makes a transition between a low resistance state and a disproportionately higher resistance state, for greatly reducing the resistor current. An additional resistor, in parallel with the thermistor, bypasses a small keep-warm current through the heating resistor for maintaining the high working temperature. The increased voltage drop across the thermistor is supplied to one input of an operational amplifier, employed as an electronic switch to energize a first LED, signaling "ready".

Abstract: A plastification cylinder of an injection molding machine includes an outside cylinder and an inside cylinder, the inside cylinder including heating elements and temperature sensors therearound and defining a screw antechamber at one end thereof, the outside cylinder being shaped so that the end thereof which surrounds the end of the inside cylinder that defines the screw antechamber is in a pressure fit contact with the inside cylinder while the other end of the outside cylinder is spaced away from the corresponding end of the inside cylinder, thereby providing an annular chamber therebetween. Connecting elements extending through the outside cylinder can be used to cause a fluid heating or cooling medium to flow through the annular chamber.

Abstract: A hot melt adhesive dispensing system including a hot melt adhesive dispenser, a hot melt adhesive tank, and a hose for coupling hot melt adhesive from the tank to the dispenser. The dispenser, the tank and the hose are heated by electrical heaters to maintain the adhesive in a suitable molten condition for dispensing and for flowing from the tank to the dispenser. When the hot melt adhesive system is first energized, the hose and tank heaters are coupled to a source of electrical power and the temperature at either the tank or the hose is sensed. When the sensed temperature reaches a suitable preselected level, the dispenser heater is then energized by coupling the heater to a source of electrical power. In this way, as the adhesive in the dispenser is heated from a solid to a molten form, it is free to expand into the hose, with the adhesive in the hose adjacent the dispenser having already been heated to a molten state.

Abstract: An electrical solder pot has a base with a hollow interior. A housing member also having a hollow interior attaches to the top of the base. The housing member further includes an opening at its top. A threaded socket is fitted in the base so as to accept a heating element which is oriented vertically within the hollow interior of the combined base and housing member. The heating element includes a threaded connector positioned near the opening in the top of the housing and accepts a threaded solder container. The solder container attaches to the top of the heating element and is positioned above the opening in the housing. The heating element includes an internal thermal conducting member located within a tube with an appropriate socket connector on the tube so as to connect to the socket in the base. A monolithic burnt ceramic heater is positioned within a cavity in the thermal conducting member.

Abstract: In the pulling of a single crystal from a melt by the Czochralski method the temperature of the melt and the crystal is controlled by a plurality of heaters surrounding the crucible in vertically disposed relation relative to each other. The lowermost heater is controlled by an automatic temperature controller in response to the temperature of the bottom of the crucible and the remaining heaters are controlled by the selectring a specific ratio for the power supply of each of the remaining heaters with respect to the power supply of the lowermost heater.

Abstract: A drawing recipient borne by a body is associated with heating means. A filtering recipient is also associated with heating means and in the operational position is raised and laterally off-set with respect to the drawing recipient. A spout serves as a spill-way from the bottom of the filtering recipient to the drawing recipient. The filtering recipient is pivotably mounted with respect to the body, between the aforesaid operational position in which it overhangs the body, and a fold-away position in which it is brought back over the drawing recipient.

Abstract: An effusion cell assembly is disclosed and includes a temperature sensor designed to balance sensor temperature and cell crucible temperature by an increased heat radiation collection.

Abstract: A basin for simultaneous or consecutive dewaxing and curing of denture molds is disclosed. The basin is generally box-shaped and is provided with three vertically-shaped trays of which the topmost remains above the high fluid level. The upper rear portion of the basin has a pivotally-secured frame-arm provided with a plurality of nozzles adapted to spray over the entire area of the topmost tray. The fluid from the nozzles drains back into the basin; a recirculating pump recirculates the fluid back into the nozzles. A separate fluid inlet is provided to fill the basin for curing. The basin is further provided with an upper and lower fluid level-limiting means, a heating element, a thermostat and, preferably, an automatic timer.

Abstract: An apparatus for liquefying meltable material comprises a container adapted to be filled with the material to be liquefied. The container has a heavy bottom wall formed with closely adjacent perforations which taper in downward direction. The sum of the open cross-section of the perforations at the upper face of the bottom wall is only slightly smaller than the total area of the latter, whereas the sum of the smallest cross-sections of the perforations is only a small fraction of the total area of the bottom face of the bottom wall. The bottom wall is heated by electrical heating elements located in ribs separating the perforations from each other to a temperature to liquefy the material passing from the container into the perforations and the liquefied material flows in a collecting trough arranged below the container and separated by a heat insulating layer therefrom.

Abstract: A plastic injection molding system having a temperature controlled electric heater element.The heater element is formed by disposing a pair of heater wires and a pair of thermocouple wires and a powdered mineral material in a metal sheath which is subjected to repeated drawing and annealing operations and is then cut to a desired length after which at one end, the heater wires are welded together and the thermocouple wires are welded to the sheath and the sheath is welded to form a closed end wall. At the opposite end, the heater and thermocouple wires are connected through connection means and connection wires to a current supply and a temperature sensing circuit. The sheath is in the form of a rightly wound helical coil structure and is installed in direct heat transfer engagement on a cylindrical surface of a metal part which has an axially extending plastic flow passage therein.