Abstract: Method for pneumatically conveying granular resin material and controlling such conveyance includes a sensor associated with granular plastic resin material receiver with the sensing vacuum level thereat and a microprocessor adjusting vacuum pump speed based on vacuum level sensed at the receiver.

Abstract: Apparatus and method for drying thermoplastic resin prior to molding into plastic parts comprises a continuous loop liquid circuit for furnishing liquid at a prescribed temperature to a mold in which the plastic parts are fabricated; a continuous loop air circuit for passing heated dry air through a hopper containing the thermoplastic resin thereby drying the thermoplastic resin to a prescribed level of dryness; and a coupling thermally connecting the two circuits for heat transfer from the liquid to the drying air; the liquid is selected from the group comprising water and ethylene glycol; microprocessor control facilitates generation and retention of custom water temperature and resin dryness/temperature optionally based on machine learning principles.

Abstract: Methods for conveying granular material from a supply to receivers that retain and dispense the material when needed by process machine include a vacuum pump, an air flow regulator connected to the vacuum pump, a first conduit connecting the receivers to the air flow regulator, and a second conduit connecting the material supply to the receivers.

Abstract: Apparatus has a vacuum pump for conveying granular plastic resin material from a supply to receivers retaining and dispensing resin when needed by a process machine with a flow limiter connected to the suction head of the vacuum pump, with the vacuum pump being a controlled, variable speed device.

Abstract: Apparatus for conveying granular material from a supply to receivers that retain and dispense the material when needed by process machine include a vacuum pump, an air flow limiter connected to the vacuum pump, a first conduit connecting the receivers to the air flow limiter, and a second conduit connecting the material supply to the receivers.

Abstract: Method and apparatus for pneumatically conveying granular resin material and controlling such conveyance includes a sensor associated with granular plastic resin material receiver with the sensing vacuum level thereat and a microprocessor adjusting vacuum pump speed based on vacuum level sensed at the receiver.

Abstract: A vacuum pump with a first flow limiter connected to the suction head of the vacuum pump for conveying granular resin material from a supply to receivers retaining and dispensing the resin when needed by a process machine and a second flow limiter controlling and limiting to a maximum value vacuum flow through a conduit carrying auxiliary additives to the receivers.

Abstract: Apparatus has a vacuum pump for conveying granular plastic resin material from a supply to receivers retaining and dispensing the resin when needed by a process machine with a flow limiter connected to the suction head of the vacuum pump, and a second flow limiter controlling and limiting to a maximum value vacuum flow through a conduit carrying auxiliary additives to the receivers.

Abstract: Apparatus has a vacuum pump for conveying granular plastic resin material from a supply to receivers retaining and dispensing resin when needed by a process machine with a flow limiter connected to the suction head of the vacuum pump, with the vacuum pump being a controlled, variable speed device.

Abstract: Apparatus has a vacuum pump for conveying granular plastic resin material from a supply to receivers retaining and dispensing the resin when needed by a process machine with a flow limiter connected to the suction head of the vacuum pump, and a second flow limiter controlling and limiting to a maximum value vacuum flow through a conduit carrying auxiliary additives to the receivers.

Abstract: Method and apparatus for pneumatically conveying granular resin material and controlling such conveyance includes a sensor associated with granular plastic resin material receiver with the sensing vacuum level thereat and a microprocessor adjusting vacuum pump speed based on vacuum level sensed at the receiver.

Abstract: A system and method for drying particulate material in a dual flow hopper employs multiple flow paths by which heated gas is inserted into the hopper at different levels. Gas is extracted from the hopper and is divided for flow along two flow paths, one of the flow paths receiving gas that has been dried and the other flow path receiving gas that has not been dried.

Abstract: A system for drying particulate material in a drying hopper (DH) has a plurality of gas flow paths, one (FP1) of which extends from a compressed gas inlet (16) to a first sub-system (SS1) that includes a membrane dryer(MD) and a heater (EH′), whereby dried and heated gas is supplied to a lower portion (36) of the hopper, and another (FP2) of which extends from the inlet (16) to a second sub-system (SS2) that includes a mixing device (30) and a heater (EH). The mixing device uses compressed gas to induce a flow of gas from the hopper and mixes the compressed gas with gas withdrawn from the hopper. The mixed gases are heated and supplied to a second portion (34) of the hopper.

Abstract: An apparatus and method for control of moisture content of material such as thermoplastic pellets (80) in a hopper (30) is controlled by supplying dehumidified air from a dessicant bed (90) to the hopper (30) and returning air from the hopper (30) to the dessicant bed (90). A dew point sensor (10) in the return air path determines the moisture content of the material (80) in the hopper (30), and when the dew point drops to a pre-set level, a diverter (134) causes the return air flow to bypass the dessicant bed (90) and to be re-supplied to the hopper (30) without dehumidification. Two dessicant beds are provided, one of which is on-process while the dessicant in the other is regenerated.

Abstract: The present invention discloses a diffuser for use in a drying system and more particularly, a tubular diffuser for use in a drying hopper. The present invention is especially useful in the conditioning of resin pellets prior to molding or extruding. It is comprised of a hollow perforated body, a closed end, an open end through which clean, warm, dry air may be supplied, and a stiffener.

Abstract: A digital readout electronic blood pressure and pulse rate monitor. A finger cuff occluder is pressurized by a single stroke plunger and an automatic vent means provides linear pressure decay while a pressure transducer measures the pressure and converts it to an electronic signal. A sound transducer senses sound transmitted from the cuff through the pressure tube, and an electronic system distinguishes the various characteristics of the sound to measure the systolic and diastolic pressures. The electronic system also measures the pulse rate. All three readings are digitally displayed only if several predetermined conditions indicating a proper reading are fulfilled.

Abstract: A pulse rate monitor for use while exercising. A clothespin type finger clip remote from the counting and display unit grips the user's finger in a predictable, mechanically stable manner. A light emitting diode, strobed to reduce battery drain, transmits infrared radiation through the finger, and electronic circuitry monitors the modulation of radiation caused by changes in capillaries with each heart beat. The circuitry includes an active load for the phototransistor, which, by means of bandpass filtered feedback, enhances heart beat signal and reduces sensitivity to ambient light, noise, and variations in phototransistor characteristics.