Abstract: A semiconductor chip molding apparatus includes an upper platen including an upper mold, a lower platen including a lower mold having a molding block configured to receive a lead frame, a controller, and an electrical detector for forming an electrical circuit between the controller and the lead frame when the lead frame is oriented improperly on the lower mold. A low-level test voltage is imparted to at least the lower mold. As a result, an electrical signal will flow from the detecting block when the lead frame rests on the detecting block. When such a signal is detected, therefore, the lead frame is determined as having been improperly set on the molding block. The signal generated is detected by a controller and used thereby to interrupt the operation of the molding apparatus.

Abstract: A method of firing ceramic bodies and includes placing the ceramic material in a heating apparatus and subjecting the ceramic material to an amount of heat energy that results in the ceramic article exhibiting a ceramic body core temperature, Tc, a ceramic body surface temperature Ts, and surface-core temperature differential that is less than or equal to a predetermined maximum temperature differential setpoint.

Abstract: A system and method for detecting and rejecting defective blow molded containers is provided. The invention includes a sound detector system for sensing the sound level from a mold during the blowing process, and outputting a sound level signal. If the sound level signal exceeds a predetermined set point, thereby indicating a discontinuous container, a kick mechanism rejects the defective container. The kick mechanism is sequenced with the sound detector system. A proximity switch may be employed to indicate the mold being in position in front of the sound detector.

Abstract: Process for producing biaxially oriented PET film for use in film capacitors with SMD capabilities and its use for SMD-technology film capacitors The invention describes a process for producing a biaxially oriented film of thickness <10 &mgr;m, where a polymer melt is extruded through the gap of an extrusion die onto a chill roll, stretched longitudinally and transversely and relaxed longitudinally by >0.1% and transversely by >3%, where the edges of the film are held during the longitudinal and transverse relaxation and the film is wound up.

Abstract: In a method of polarization-treating a piezoelectric material, the maximum polarization degree &Dgr;f180max achieved by 180° rotation is determined. A residual polarization degree &Dgr;f as a target value and the maximum polarization degree &Dgr;f180max are compared. In the case of &Dgr;f≦&Dgr;f180max, a determination is made as to the temperature TA for obtaining the polarization degree &Dgr;f made up solely of the polarization degree achieved by 180° rotation. Half-polarization is carried out at the temperature TA, and aging is conducted at the temperature TA, whereby a piezoelectric material of which the ratio of the polarization achieved by 180° rotation is 100%, which is stable thermally with passage of time, and has a polarization degree &Dgr;f correctly coincident with a target value, can be obtained.

Abstract: A method for monitoring characteristics of materials includes placing a material in an application zone, measuring a change in at least one property value of the application zone caused by placing the material in the application zone and relating changes in the property value of the application zone caused by the material to at least one characteristic of the material An apparatus for monitoring characteristics of a material includes a measuring device for measuring a property value resulting from applying a frequency signal to the application zone after placing a material in the application zone and a processor for relating changes in the property value caused by placement of the material in the application zone to at least one desired characteristic of the material. The application zone is preferably a resonant cavity.

Abstract: Stabilized solution-dyed fiber is made by melting a polyamide which is amide monomers polymerized in the presence of at least one hindered piperidine compound, coloring the melted polyamide, and spinning the colored polyamide into fibers that have about 40% or better retained tenacity after 2125 kJ exposure to xenon arc radiation as per AATCC Test Method 16-1993, “Colorfastness to Light,” Option E. Copper stabilizers are unnecesssary.

Abstract: The present invention relates to a paint color testing kit and method. More particularly, a test kit that duplicates and eliminates the spray process utilized for both color and strength control of paint products in a quality setting. Also provided is the ability to substantially duplicate the surface in which the paint is to be applied to a testing member of the kit and the painted surface to be evaluated or repaired.

Abstract: A machine for manufacturing thermoplastic tubes from hollow thermoplastic sleeves by a variety of different manufacturing processes. The machine is a single apparatus having an indexing table with a plurality of mandrels for holding hollow thermoplastic sleeves for the purpose of transporting the same around a closed manufacturing path. The manufacturing path of the machine is a series of stations which are mechanical devices for carrying out the manufacturing steps necessary to produce tubes from thermoplastic blank sleeves. The stations of the manufacturing path are modular so that they may be removed, added or rearranged; may be optionally connected to a process logic controller and may optionally have sensors for information feedback to the PLC device.

Abstract: A molding apparatus is provided for molding an elongated shaft member. The elongated shaft member (20) comprises: a main body (21) made from synthetic resin material; a hollow portion (22) formed inside of the main body (21), which extends substantially in a direction of a center axis (O1) of the main body; first and second shaft portions (23) formed at ends of the main body (21) respectively, which are smaller in diameter than the main body (21); and through-holes (24) formed in the first and second shaft portions (23) respectively, which are substantially coaxial with the center axis (O1). The molding apparatus comprises a mold (26, 27), a medium injection device (50) for injecting a hollow-portion forming medium from a medium injection portion (32), and a resin filling device (40) for filling the cavities with molten resin through a resin injection portion (31).

Abstract: A cavity 22 in an injection molding assembly includes a lower mold insert 21 for shaping a lens convex surface and an upper mold insert 20 for shaping a lens concave surface. When the heated injection molding assembly is cooled and a lens is ejected after a molten resin is pressurized by the upper mold insert 20, the temperature of the lower mold insert 21 is lowered below the temperature of the upper mold insert 20, which prevents the molded lens from bending at a central portion and enable high transfer precision of insert shapes.

Abstract: A method of patterning domains within a body of a ferroelectric material includes the application of an electric field thereto via spaced conductors. Prior to applying the electric field to the material effects on the patterning of the existence of fringe electric field components which will be created in said body by said application of an electric field, surface treatments, and relative geometries of the body and the conductors are examined.

Abstract: A rapid prototyping and manufacturing (e.g. stereolithography) method and apparatus for making three-dimensional objects with enhanced control of the temperature of the build environment. A modulated control signal is supplied to a heating element based on a difference between a desired build temperature and a detected temperature. The modulated signal result in the heater supplying, on average, more energy to the build chamber when the temperature difference is large and supplying, on average, less energy to the build chamber when the difference is small. The detection of the build chamber temperature may occur at one or more locations. If multiple locations are used, the detected temperatures may be averaged, or otherwise combined, to derive a single difference value that will be used to control the heater.

Abstract: A method and apparatus for molding composite articles can include a pair of opposed hollow mold sections having first and second molding membranes which define a mold plenum therebetween. Each mold section can be filled with a substantially noncompressible, thermally conductive fluid. The temperature of the mold plenum can be controlled by regulating the temperature of the thermally conductive fluid. Sensing of various parameters during the injection and curing processes of the molding fluid, for example pressure, flowrate, temperature and filling of the plenum can be used to optimize the molding process.

Abstract: A mixing and dispensing system for reactively combining organic chemical components to produce a rapidly polymerizing material for use in molding and encapsulating small and usually delicate devices, such as electronic components. The system uses a novel mix head incorporating a high speed rotary mixer having magnetic coupling for mixing and injecting relatively low viscosity polymerizing materials into a mold. The chemical feed to the mix head is from special chemical handling equipment. The design of the system eliminates the need for material control valves and enables relatively low feed line pressures. A novel chemical handling subsystem uses special tubular containers provided by the chemical material manufacturers that mount on specially designed dispensing equipment, and do not require special storage, handling, or mixing by trained personnel.

Abstract: A method of molding a plastic with a foamed interior and a dense outer skin of a desired thickness, whereby a blowing agent is mixed with a plastic material and the mixture is injected, under pressure, into a mold cavity of a mold unit. The mixture is allowed to cool along the molding surfaces of the mold cavity for a determined amount of time. The pressure is released and the mold cavity expanded to allow the blowing agent to foam the interior of the plastic article. The molding cavity is then compressed to achieve the desired dimensions for the plastic article, and to give the interior a uniform cellular structure. Control over the timing of the expansion of the mold cavity, the injection temperature, the rate of injection of the mixture, the rate at which the cavity is expanded and compressed, and the timing of the compression of the mold cavity allow a skin of desired thickness to be formed on the plastic article.

Abstract: A rapid prototyping and manufacturing (e.g. stereolithography) method and apparatus for producing three-dimensional objects by selectively subjecting a liquid or other fluid-like material to a beam of prescribed stimulation. In a preferred embodiment a source of prescribed stimulation is controlled to reduce or inhibit the production of the prescribed stimulation during at least some periods when the prescribed stimulation is not needed to expose the material. In another preferred embodiment, the source of stimulation is controlled to vary the quantity of prescribed stimulation that is produced and allowed to reach the material. In an additional preferred embodiment, control of laser output occurs based on a combination of supplying a regulated amount of voltage to an AOM in conjunction with temporary sensing of laser power and a known desired power to attain.

Abstract: A method of domain patterning a body of ferroelectric material in which the effects of the materials which interface with the body are selected to provide selected characteristics to the domain pattern.

Abstract: A method of forming plastics which comprises the sequential steps of cutting a plastic piece from a sheet of plastic, heating both sides of the plastic piece by contact heating, molding the heated plastic piece into its end-shape by press-molding, and cooling the heated and molded plastic piece into its end shape by air cooling means. In the preferred embodiment, the plastic piece, which may be laminated on one or both of its sides, is heated by use of a heating press which compresses the plastic piece thereby preventing "wrinkling" or warping of either side of the plastic piece. Thereafter, in the preferred embodiment, the heated plastic piece is positioned in a press-molding mechanism which comprises specially made male-female dies. Preferably, the air cooling step of the method takes place during the latter part of the press-molding step whereby both steps are, at some period, occurring concurrently.

Abstract: A rotational molding apparatus that utilizes stationary temperature sensors, e.g., infra-red thermometry (IRT) sensors, for continuously monitoring the temperature of the molds during rotation.

Abstract: The present invention relates to injection mold hot runner control devices and more particularly to an injection molding control device which eliminates the conventional control cables to improve the quality of feedback signals received by the controller and the safety of the environment in which such systems are used. The present invention utilizes a signal processor to convert analog signals received from the mold temperature sensors into a digital feedback signal in the vicinity of the mold and to transmit such feedback signal to a receiver connected to a controller at a location remote from the mold. The mold controller processes the feedback signal and generates a corresponding control signal. The control signal is transmitted from the remotely located controller to the controlled device, typically the mold heaters.

Abstract: A process and an apparatus for molding, in which a molten thermoplastic resin is firmly fitted onto a molding surface of a mold under a pressure lower than or equal to 100 kg/cm.sup.2 and is cured to obtain a molded product. The molding apparatus has a mold main body, and a mold body on which the molding surface is defined. The mold body is supported relative to the mold main body with maintaining a space on the back side of the molding surface in a heat insulative manner by a supporting member which includes at least a heat insulative supporting member having a thermal conductivity of 0.001 to 1 Kcal/mh.degree. C. and a longitudinal elastic modulus of 0.01 to 10 kg/cm.sup.2. In the space, a heating fluid for heating the molding surface from the back side to a temperature higher than or equal to Vicat softening temperature (T).degree. C.

Abstract: A method for forming a bend in a tube of thermoplastic material by heating a pre-formed bend to a pre-determined temperature and maintaining the temperature substantially constant by the pulsed emission of infra-red radiation from one or more infra-red sources in response to the surface temperature of the tube detected by a remote temperature sensor.

Abstract: Centrifugal casting is used to establish a gradient profile of reinforcement particulate densities in a carrier matrix of a polymer resin and in an aluminum alloy. Cast disks of silicon carbide (SiC) reinforced resin and Al-Si/SiC particulate reinforced MMCs have been produced that show a gradient of SiC increasing from a denuded region adjacent to an axis of rotation of the disk to a maximum density at the periphery of the disk. An applied centrifugal acceleration applied by rotating the mold is used to establish an artificial settling of the particulate field in a homogeneous mixture of a fluid matrix and the particulates. The principle parameters in establishing a range of particulate densities in centrifugally cast particulate composites are the centrifugal acceleration applied and the length of time the matrix material remains in a liquid state. The magnitude of these parameters are determined by the specifics of a particular casting design.

Abstract: Stresses are relieved in elongated extruded plastic members by passing electric currents through electrical conductors embedded in the reinforcing bars. The reinforcing bars are manufactured according to a pultrusion process in which 1/16 inch diameter MIG wire is introduced into a roving bundle of impregnated fibers and drawn through a curing and shaping die. The resulting product is a rigid reinforcing bar having a longitudinal wire extending its entire length. The reinforcing bars are cut to lengths corresponding to the desired lengths of the elongated members to be extruded. The elongated member is manufactured using an extrusion process in which molten plastic surrounds a plurality of reinforcing bars to form a continuously extruded member. The member is cooled, cut at the reinforcing bar joints, and prepared for electrical resistance heating. Electrical contacts are inserted into bores provided in the ends of each reinforcing bar and are placed in electrical contact with the embedded wire.

Abstract: To control the film thickness in a blown film extrusion line with reversing or rotating takeoff of the film bubble, the thickness profile of the blown film bubble is measured over its circumference. Different temperatures can be applied to sections of the film bubble by a die ring divided into heating sections provided with control elements or by heating elements, forming a ring around the extruded film bubble and provided with control elements. In order to correctly assign the position of the measured thickness profile to the heating sections of the die ring or the heating elements, the extruded film bubble is provided with a mark in the region of the die ring or the heating elements and the rotation of this mark is measured by a measuring device at specified intervals from the die ring or the heating elements.

Abstract: Method and device for manufacturing biaxially oriented tubing from thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel includes an expansion part which produces expansion in the circumferential direction of the tube, and downstream of the mandrel the exertion of an axial pulling force on the tube, in the course of which the tube encounters a resistance which counteracts the movement of the tube over the mandrel. The method also includes the exertion of an influence sector-wise in an adjustable manner in the circumferential direction of the tube on the resistance which counteracts the movement of the tube over the mandrel. In an advantageous embodiment, the temperature of the plastic material of the tube is influenced sector-wise in an adjustable manner, viewed in the circumferential direction of the tube. The measures according to the invention lead to better control over the manufacture of biaxially oriented tubing.

Abstract: A continuous method of and system for fabricating thermoset polymer pellets wherein thermosetting polymeric resin material flows axially in a temperature controlled, mixer-extruder barrel while maintaining the material between a melt temperature and a higher thermosetting reaction temperature, and extrudes from the barrel at an extrusion temperature between the melt and reaction temperatures. The extruded material is formed into generally spheroidal pellets which are cooled in a transporting coolant liquid stream and charged to the interior of an open ended, centrifuge basket having a porous circumferential wall and an interior annular pusher plate. The wall is rotated to demoisterize the pellets by centrifugally removing liquid coolant and while reciprocating the pusher plate and basket relatively to displace the pellets axially along and off the basket wall. Pellets are taken from the basket wall without substantially fracturing them and forming an undue percentage of fines.

Abstract: A carbonaceous article is made by baking paste under continuously applied high pressure. The paste is extruded as it is baked to form the article, and the article may be further machined after baking. A force opposing extrusion is applied to the article to allow high pressures to be provided to the paste. The location of the baking zone both longitudinally and peripherally is carefully controlled to preclude over or under baking. Longitudinal control of the baking zone is effected by measuring the force required to extrude baked paste, and peripheral control is effected by measuring the extent of the baking at several peripheral locations and controlling the baking current at these locations. The article may be an electrode for supply to an electric arc furnace immediately after baking or to a furnace remote from the baking station.

Abstract: Method and apparatus for making and coating a plastic lens. Oxygen barrier containing photoinitiator is used to cure incompletely cured lens portions. Radiation pulses are used to control lens curing rate. Lens is postcured while in a mold cavity using a conductive heat source.

Abstract: A mold for use in a molding machine for manufacturing a magnetic roll for use in an electrophotographic printing machine of the type having an electrostatic latent image recorded on a photoconductive member is provided. The mold includes a body and an insert. The body defines a surface of the body. The insert is positioned at least partially against the surface of the body. The insert defines an inner surface of the insert. The inner surface is adapted to conform to at least a portion of the periphery of the roll. The insert may be replaced when worn and the body may be reused with a replacement insert.

Abstract: The present invention is directed to a blown film extrusion apparatus in which film is extruded as a tube from an annular die and then pulled along a predetermined path. The improved blown film extrusion apparatus includes a system for gauging and controlling the surface of the extruded film tube, which includes a number of components which cooperate together. At least one transducer is provided and positioned adjacent the extruded film tube for transmitting interrogating pulses to, and receiving interrogating pulses from, the extruded film tube, and for producing a signal corresponding to a detected position of the extruded film tube. A control system is provided for substituting a filtered position signal derived from a dynamic filtering process in lieu of the detected position signal. An air flow controller is provided for varying a quantity of air within the extruded film tube in response to the control system for urging the extruded film tube to a desired position.

Abstract: A method for controlling an automatic rotamolding process, the method including the steps of: metering a first prescribed quantity of plastics material powder into a hopper to be delivered to a rotatable mold as a first shot; heating the mold; when the mold reaches a prescribed temperature, delivering the first shot of powder from the hopper to the mold and simultaneously rotating the mold so as to distribute the powder over an interior surface of the mold; heating the mold in accordance with a predetermined temperature-time characteristic; cooling the mold; and ejecting the finished rotamolded product from the mold.

Abstract: A method and apparatus for spinning filaments of a polymeric material includes a first temperature control arrangement for heating a spin pack to a first predetermined reference temperature greater than the predetermined polymer inlet temperature such that the temperature across a polymer filter holder and the spinneret plate in the spin pack is substantially uniform, whereby the temperature of the filaments emanating from the spinneret plate is substantially uniform. A plate assembly having at least one polymer flow passage therein is disposed between the outlet of the pump and the inlet of the spin pack. A second temperature control arrangement for independently controlling the temperature of the plate assembly to a second predetermined reference temperature is provided.

Abstract: A method for mold heater startup and sequencing detects the heater zones associated with greater mass and allows them to heat up before zones of lesser mass, thereby reducing wear of the associated mechanical components and minimizing degradation of plastic material. The zones of smaller mass are kept at minimal temperatures until the zones with greater mass reach a set point. The system is capable of detecting multiple levels of thermal load and provides appropriate sequential startup of the identified thermal loads. The operator may also manually program the system to override certain automated sequences in order to ensure an optimal startup sequence. The sequencing of power application to large heaters also minimizes the peak current draw of the system.

Abstract: A method for producing composite, structural plastic parts in traditional foundry molds, including sand, permanent, die-cast, wax and investment molds. Short fiber length fibers reinforcing low viscosity thermoset resins, and in particular resole phenolics, provides a pourable low bulk density polymer compound with minimal externally applied thermal requirements during molding and post cure when required. Foundries can consider metal parts replacement with this new method. It permits foundries to actually produce composite, structural plastic parts with superior mechanical and thermal properties. This permits them to provide plastic products on a competitive basis with the compression and injection molders.

Abstract: An apparatus for separating individual contact lens mold assemblies, the assemblies each being a front curve mold half and a back curve mold half, each mold half having annular circumferential flanges, is included. The apparatus includes a device for applying steam to the back curve mold half to form a temperature gradient from the front mold half to the back mold half. The apparatus also includes a second device to pry the mold halves apart.

Abstract: A multi-component extruder for producing a multi-component profiled member has at least two individual extruders for extruding a single-component profiled member. Each individual extruder has a housing with a chamber for receiving the extrudable material and an extruder shaft rotatably supported in the chamber. Each individual extruders has an extruder mold nozzle for continuously extruding the single-component profiled member. The individual extruders are equipped with devices for measuring pressure and temperature. A common extruder head has a confluence zone in which the extruder nozzles are arranged to combine the single component profiled members to the multi-component profiled member. A device for measuring the multi-component profiled member is provided.

Abstract: An improved machine for applying surgical implements to handles comprising a fluent actuated power cylinder with a moveable rod having a distal end. A handle holder is secured to the distal end. The handle holder has a handle cavity therein for holding a surgical implement handle. The handle has an implement stud opening extending axially of the machine. An implement holder having a tool cavity therein for holding a surgical implement with a handle stud facing the stud opening on the machine axis is provided.

Abstract: A plastic foam-forming mixture, e.g. a polyurethane or polyisocyanurate foam mix, deposited on a carrier, is metered through two spaced opposed members forming therebetween a metering gap. At least one of the members is malleable through changes in temperature so that the profile of the metering gap can be variously defined. Foam boards having a highly uniform thickness are thereby continuously and expeditiously producible.

Abstract: A mixing apparatus for continuously generating a homogeneous mixture of a polymer and a less viscous fluid is provided. The mixer includes means for continuously injecting a viscous polymer into a pressure vessel; means for continuously injecting a lower viscosity fluid into the pressure vessel; means for continuously injecting a plasticizing agent into the viscous polymer entering the pressure vessel; high shear centrifugal mixing means within the pressure vessel for mixing the polymer and the less viscous fluid; drive means for rotating the rotational mixing means; heating means for maintaining the temperature of the substances being mixed in the pressure vessel at a desired mixing temperature; and means for continuously discharging a homogeneous mixture of the polymer, the plasticizing agent, and the less viscous fluid from the mixer.

Abstract: An extrusion method and apparatus for removing volatile contents from solid state resin materials is described. A cascade-type extruding device is used having first and second extruders. A top end portion of the first extruder 10 is directly connected to a rear side portion of a cylinder of the second extruder 100. Volatile contents of a melted resin, which is melted when the solid state resin material is supplied to the first extruder, are removed in a volatile content removing vacuum unit provided on an upstream side of the connection between the first and second extruders. The melted resin is then extruded from a nozzle provided at a top end portion of the second extruder. The volatile content removing vacuum region of the volatile content removing vacuum unit 140 extends over a first region, which is under the control of the first extruder, and a second region, which is under the control of the second extruder.

Abstract: A method for reducing curl in a stored photographic film which aids in preventing serious difficulties with downstream film transport and handling of the film. The film, which has been stored as a roll wound on a first core or mandrel is unwound from the first core and wound onto a second core or mandrel in a first direction. The film is then unwound from the second core to yield a traveling web portion. The traveling web portion is preheated to a predetermined temperature while being continuously delivered to a housing. The film is wound onto a third core or mandrel located within the housing in a direction opposite the first direction where it is maintained at about the same predetermined temperature.

Abstract: Apparatus and method for providing material to a mold, such as in an injection molding system, wherein the settings for controlling the molding operation are retained in a non-volatile memory in a hot-half of the mold. When connected to a system controller, the hot-half of the mold is configured to communicate the retained information to the system controller, thereby enabling simplified set up of the molding operation. The retained information includes system information, initial settings for a plurality of heating zones, and historical information associated with that particular hot-half of the mold. Changes made to the information at the system controller are transmitted to the hot-half for dynamic updating of the non-volatile memory.

Abstract: Method and apparatus for the selective heat-induced deposition of solid material from gas-phase or super-critical fluids to produce three-dimensional parts by pyrolysis of the fluids. The apparatus involves computer/feedback control of the evolving shape by direct monitoring of the volumetric deposition rate or growth profile, and modifying light beam focal properties, the position and orientation of the deposit relative to the beam foci, and/or the pressure and flow of reactants to the growth zone. The precursor gases may be pressurized and heated to the critical point or beyond, becoming super-critical fluids, without condensation. Growth occurs by diffusion of reactants to the growth zone through a boundary layer over the deposit. One method of growth includes directing a large-area impinging jet of precursor fluid(s) onto a deposit interface, while limiting the reaction zone to a smaller area determined solely by size of the heated zone (through use of a radiant beam, e.g.).

Abstract: A control system is applicable for an injection molding machine which has a temperature setting function and display function. The control system includes a temperature scale/unit setting function for selecting a temperature setting and a displaying mode which changes a data display between a Centigrade mode (where a temperature setting device and temperature on the display are performed in Centigrade) and a Fahrenheit mode. The control system also includes a display switching function for temporarily switching the display mode to a mode different from the current temperature setting mode as set by the temperature scale/unit setting function and a display mode restoring function for switching the temporarily switched display mode to the original display mode.

Abstract: When casting castable refractories as lining refractories of a ladle for a molten metal, wherein the castable refractories are prepared by kneading monolithic refractories with an aqueous solution of a binder containing alumina cement, the castable refractories are preheated on the basis of the open air temperature and cured after casting while keeping the temperature thereof within a set temperature range of from about 20.degree. C. to 40.degree. C. The method stabilizes the hardening time of castable refractories and forms cast refractories excellent in strength and erosion resistance.

Abstract: A material processing apparatus for thermo flow melt spinning having temperature control characteristics. The apparatus includes a spinner head with a chamber that has a continuous perimeter for centrifugal force and a heater element substantially continuous with the perimeter for providing heat to the head. The spinner head includes means for rotating and a power source connected to the heater element. The apparatus includes temperature detecting means integral with the heater element to detect a processing temperature and generate a temperature detection signal accordingly. Also included is a power controller for controlling the power source in accordance with the temperature detection signal. The processing temperature may be controlled such that a substantially constant temperature is maintained.

Abstract: An on-demand fast cycle mold for producing injection molded products such as polypropylene blister package bases. The on-demand fast cycle mold has a heated and cooled hot runner system which provides a short response time and optimal temperature control. On-demand injection molding is made possible by a pulse modulated closed loop mold cooling system, the cooling design of brazed gate inserts, and an effective layout of the cooling channels. The programming of the software for a computer control system has also been designed to achieve on-demand injection molding. The design of the closed loop mold cooling system incorporates an advanced cooling circuit layout, and provides for easy maintenance and better quality control of the coolant which significantly reduces corrosion and scale buildup. Mold cooling is controlled by sensors installed inside the mold which are used in feedback control loops.

Abstract: A device for controlling temperature of an injection molding machine nozzle to maintain uniform temperature all over the nozzle and to prevent stringiness, drooling and so on of melted resin, which provides a temperature controller for controlling temperature at the front portion and the rear portion of the nozzle by controlling the electric power supplied to the front heater and the rear heater with ON-OFF operation of a relay and a voltage regulator for controlling voltage applied to one of the front heater or the rear heater by an operational amplifier detecting differences of temperature at the front portion and the rear portion of the nozzle.