Abstract: A hydraulic pressure cylinder incorporating a double-rod type piston, for example an injection cylinder has a pair of pressure sensors for detecting the hydraulic pressures of fore and rear oil chambers. are respectively detected by a pair of pressure sensors 4, A detected pressure value Pd is subsequently obtained from the difference between respective oil chamber pressure measurements Pdf, Pdr based on the outputs respectively from pressure sensors. The detected pressure value Pd of period Ts during which detected pressure value Pd becomes zero theoretically, is calculated in advance. The calculated detected pressure value Pd is stored as correction value A. At the time of pressure sensing, the detected pressure value Pd is corrected according to correction value A, whereby the accurate zero adjustment point may always be maintained without being influenced by a temperature drift, enabling an accurate and high-precision pressure sensing.

Abstract: A control system utilizing a programmable controller for an injection molding machine in which the controller is periodically scanned in response to input signals to produce output control signals is provided with an impulse response filter arrangement. The impulse response filter senses a plurality of current and past sensor input signals to accurately predict the occurrence of a variable triggering event which will in fact be sensed by a sensor. A predictive sensor signal is then generated which is inputted to the controller in advance of the occurrence of the triggering event and at a time which corresponds to the processor scan time so that the controller generates the desired output at the precise time the triggering event occurs thus eliminating controller response latency from the control system.

Abstract: A method for regulating the thickness of several individual layers of an extruded multilayered plastic web involves melting at least two currents of molten plastic in different extruders and bringing the individual molten currents together in an adapter wherein the currents are superimposed into a laminated extruded multilayer stream. The extruded multilayer stream is supplied to a die slot. Devices are provided for controlling the flow of individual currents of molten plastic by modifying their sections before the currents are brought together in the adapter. In order to regulate the thickness distribution, the thickness of the individual layers of the multilayered extruded stream, which correspond to the different currents of molten plastics, is determined before the stream leave the die slot; that is, while the currents are still in a plastic state.

Abstract: The disclosure relates to a hydraulic ram operated extruder (10, 11, 13, 14) having an extrusion die (12) from which an extrudate is delivered and a motor driven cutter (48, 49) at the die to sever the extrudate repeatedly to produce individual pieces of extrudate. A hydraulic fluid circuit includes a pump (16) and control valves (19, 22, 23) delivers hydraulic fluid to the ram of the extruder at a substantially constant volume flow-rate and a control device responsive to the speed of advance of the ram in the extruder controls the motor device of the cutter to produce blanks of substantially equal volume.

Abstract: A method and apparatus in the context of a rotating conveying screw situated within a cylindrical housing which has an inlet port on one end of the cylinder and a discharge opening on the other end of the cylinder. A resistance plate is mounted transversely to the conveying screw near the discharge opening for corotation with the screw. The plate is mounted to define a discharge gap between the opening and the plate. A sleeve on the housing is employed to adjust the size of the gap between the plate and the opening. A process controller positions the sleeve by means of a pair of screw jacks. The controller adjusts the discharge gap width to maintain feed material temperature within a predetermined band. Alternatively the controller adjusts the discharge gap width and feed screw speed to maintain a predetermined specific energy input into the feed material. The helical screw is preferably supported at both ends by a bearing means.

Abstract: A monitoring system provides a method of operating a compression plastic molding apparatus which entails substantially continuously monitoring the position of an upper compression cam of the apparatus, against which a rotatably movable mold assembly reacts during operation of the apparatus. By monitoring the position of the compression cam, the system is able to detect excessive loading of the apparatus, such as attendant to depositing of excessive plastic material in the mold assembly. A force determining device, illustrated in the form of a fluid pressure (pneumatic) cylinder, is operatively connected with the compression cam, with the system operating to release pressure in the cylinder in the event that the compression cam is moved in a manner which indicates excessive loading of the plastic mold assembly.

Abstract: A controller for controlling a pellet mill, used to extrude milled ingredients through a die into more manageable and economical pellets, keys particular control parameters to a library of pellet types and then adjusts the control parameters to optimize throughput within the limits imposed by potential plugging of the die. If a potential plugging is detected, the controller responds in two stages, intended to reduce the restart time for pluggings of less severity, and thus to allow more aggressive operation. Pellet fines are recycled and liquid ingredients compensated to provide improved efficiency.

Abstract: An improved injection blow molding apparatus. The apparatus includes an injection blow molding machine having work stations and molds. The apparatus includes a process controller for operating the blow molding machine according to a set of processing parameters. Each processing parameter has a respective desired operating range. The apparatus includes a touch screen for inputting signals to the processor for commanding the process controller to adjust the processing parameters. Display software and hardware coupled to the process controller and the touch screen cause the monitor to display respective icons representing each processing parameter. The value of each respective processing parameter is displayed adjacent to the icon. Graphing software generates signals which are transmitted to the monitor. The monitor displays a graph of the selected processing parameter value as a function of time.

Abstract: A film manufacturing apparatus includes a circular die having a lip-shaped circular outlet for extruding a molten plastic in an annular form and an air passage for blowing air into the annular molten plastic to form a bubble. A water containing cooling ring cools the bubble and restrains the bubble so as to form a tubular plastic film below the cooling ring. An ultrasonic sensor is arranged near the circular die and extends substantially downwardly obliquely toward the center of the bubble for detecting the distance between the surface of the bubble and the ultrasonic sensor, and a controller controls an air supply regulating valve arranged in a line leading to the air passage to control the size of the bubble. Also, an ambient temperature sensor is arranged for correcting the speed of the ultrasonic signal, and a receiving time selecting device is arranged for correcting the time period during which an ultrasonic signal reflected from the bubble can be received.

Abstract: An easily controllable method to adjust a die slot exit gap to produce an accurately controlled flow from the slot exit across the width of a die provides movable back seats at the back of the die that cause front and back portions of die plates to move simultaneously to produce a change in the die slot exit gap. At least one actuator is located between the front and back seats of the die to increase or reduce the actuator length to bend the first plate around the front seat thereby to increase or decrease the first exit gap.

Abstract: A twin-piston food pump includes a hydraulic cylinder coupled with each piston for driving the pistons and a linear transducer coupled with each cylinder for determining the positions thereof. Control circuitry coupled with the transducers determines the velocity of the cylinders and thereby the pistons and controls the application of hydraulic fluid through the cylinders to maintain a constant food product flow rate.

Abstract: A load of plastic material is formed from two sheets cut successively from a roll of strip material. The first sheet is cut to a roughly constant length, weighed and loaded on to a conveyor. The second sheet is cut to the length calculated according to the weight of the first sheet and is loaded on to the conveyor in a predetermined position in relation to the first sheet. Each sheet is positioned by transferring it from the cutting station to a transfer structure moved in relation to a stop structure set each time to a given programmed position.

Abstract: A method and charging apparatus for feeding successively individual strips of a deformable material to a calender for calendering under pressure between at least two rotatably driven calender rolls. The strips are produced from a strand of an elongated mass of deformable material provided from an extruder or rolling mill which is then cut into individual strips transported to a roller conveyor which positions them in a common plane successively at a selected or determined position extending transversely of the roller conveyor rollers in a direction parallel to the length direction of the calender rolls.

Abstract: A method for producing continuously a long reinforced hose having a plurality of reinforcement layers. An inner reinforcement layer is formed by braiding steel wires or fibers on a mandrel and a rubber is extruded onto the inner surface of the reinforcement layer to form an inner rubber layer therein. An adhesion rubber is then extruded onto the outer surface of the inner reinforcement layer to form an adhesion rubber layer thereon and at the same time an outermost reinforcement layer is formed on the adhesion rubber layer by braiding on a mandrel. The unvulcanized hose including the respective layers is pulled at a speed higher than the braiding speed of the outermost reinforcement layer, thereby firmly joining the reinforcement layers and then pulled at a lower speed but still higher than the braiding speed, thereby more firmly urging both the reinforcement layers to each other.

Abstract: An injection molding assembly includes an automatic control unit that activates a machine moving mechanism to move an injection molding machine toward a mold unit and further activates the injection molding machine to inject molten foamable material into a mold cavity of the mold unit until the pressure inside the mold cavity reaches a first predetermined value to indicate that a predetermined amount of the molten foamable material has been fed thereto. The control unit activates the machine moving mechanism to move the injection molding machine away from the mold unit and further activates a mold opening mechanism so as to open the mold unit when the pressure inside the mold cavity reaches a second predetermined value to indicate that foaming of the molten foamable material in the mold cavity has been completed.

Abstract: A method for forming an extruded weather strip having a trim portion and a lip having a thickened end portion.

Abstract: This invention relates to a method for controlling the introduction of additives, in the form of a plurality of strands, to a cutter. The strands are cut into pellets, and the pellets are fed to an extruder for making thermoplastic shaped articles. The feeding of the strands to the cutter and extruder involves feeding the strands through a metering device and calculating the feed rate, velocity, and delta position for each strand per feed interval in order to obtain the desired amount of additive in the resulting thermoplastic article.

Abstract: A parison molding method and its apparatus in which at least two kinds of materials are used, and the layer formation and dispersion are uniform in the weld part and in the circumferential direction. In the parison molding method and its apparatus, molten resin at a weld part within a parison head is discharged out of the parison head by way of a flow control valve.

Abstract: Methods of and apparatus for controlling a startup process of a wire insulating line until a desired outside diameter of an insulated wire is obtained. A startup control apparatus according to the invention comprises an extruder for supplying an insulating material around a core conductor, a take-up device for taking up the insulated wire, a diameter measuring device for measuring an outside diameter of the insulated wire and a processor for monitoring and controlling the line startup process. In a method of controlling the startup process of the wire insulating line, the processor calculates a target speed ratio r between the extruder and take-up device, performs a first correction in which a demanded take-up speed CA' is increased by a predetermined increment .DELTA.CA if a measured wire diameter D is equal to or greater than a target wire diameter D.sub.0, followed by a second correction in which a demanded extruder speed EX' is increased by a predetermined increment .DELTA.

Abstract: An apparatus and method for controlling in a variably controllable fashion the width of an extruder die opening whereby the width of material being extruded may be controllably varied.

Abstract: A screw rotating and advancing device for an injection molding machine, in which a movable pressure plate is provided with a servomotor to drive a ball screw in association with a ball nut provided at a rear fixing plate, so that the movable pressure plate homogeneously drives a screw shaft passing through a front fixing plate to perform the operations of injection, holding pressure, and measuring back-pressure; and accomplish a close-loop control of the pressure of molding material by using a force sensor. The other side of the movable pressure plate is provided with a servomotor to rotate the screw shaft, so that the rotational speed of the screw shaft can be precisely controlled. Furthermore, the present invention includes a pre-load system including at least two pre-loaded hydraulic cylinders, at least tow pistons and a communicating tube to balance the pressure difference between the prepressurized hydraulic cylinders.

Abstract: An injection molding unit for injection molding machines includes a first subassembly having a plasticizing unit including a screw cylinder and a screw, a second subassembly having a metering drive to rotate the screw of the plasticizing unit, a third subassembly having two drives with substantially parallel axes for providing motion of the screw cylinder relative to an injection mold, and a fourth subassembly having two drives with substantially parallel axes for producing actual displacement of the screw in the screw cylinder of the plasticizing unit, with the plasticizing unit being located substantially centrally between the two parallel axes of the third and fourth subassembly drives, and with the two drives of said fourth sub-assembly include two liquid-cooled electric servomotors, respectively, electrically connected to one another to operate synchronously.

Abstract: An integral reclosable bag die assembly for extruding a bag film and a closure profile integrally connected thereto, includes a die including an inlet port for receiving molten polymeric material, an elongated outlet port for discharging the molten material, and a coat hanger plenum extending between the inlet and outlet ports for channeling the molten material from the inlet port to the outlet port. The outlet port includes a pair of elongated lips disposed opposite one another. One of the lips is detachably interlocked to a remaining portion of the die and has a closure profile extrusion site configured in the form of the closure profile. The plenum opens into a diverting channel at an upstream location thereof to divert a portion of the molten material from the plenum into the diverting channel.

Abstract: In that process for the production of hollow bodies from thermoplastic material by extrusion blow molding in which discontinuously extruded preforms are expanded in a blow molding mold, at least during that part of the filling phase which is typical of such a process, for an extrusion head, the distance covered by an ejection piston associated with a storage chamber and the speed at which the ejection piston is displaced within the storage chamber by the plasticised material are detected and compared by a central control and regulating device to the respective reference values. On the basis of the result of the comparison operation at least one operating parameter of the process, for example the delivery output of the extruder or the extent of the emptying strike movement of the ejection piston can then be adapted while still in the same working cycle in such a way that substantially the required preform volume is ejected.

Abstract: A method and apparatus is provided for generating a cylindrical composite preform. A tubular sleeve of cloth is maintained upon a mandrel which is passed through an injection chamber into which a thermosetting resin is injected. A small cavity within the resin injection chamber meters the resin into the cloth to assure complete and total impregnation thereof. The mandrel exits the resin injection chamber and enters an oven where the resin and fabric composite is B-staged. Subsequently, the composite sleeve is cut into appropriate lengths and removed from the mandrel for further processing for development of an end product.

Abstract: A parison length control method for a blow molding machine in which a parison is extruded vertically, the end of the parison is closed, and a blowing gas is blown into the closed parison. The method includes the step of deriving a relationship between parison length and extruder screw rotation speed during a test molding process. Current parison length is then detected during normal molding operation, and the difference between the current parison length and a target parison length is derived. The extruder screw rotation speed is then controlled by calculating a correction amount for the extruder screw rotation speed based on the parison length difference in combination with the relationship between parison length and extruder screw rotation speed. The extruder screw rotation speed is then adjusted by the correction amount so as to attain the target parison length.

Abstract: A manufacturing method and apparatus therefor for forming an elongate body such as a window molding for automobiles in which a thin member H is formed by pressing a thick member V by a press roller 4. The press roller 44 presses the thick member at a definite pressure in order to join an outer support 15 and a head 12V of the window molding by a specified length according to a longitudinal position. At the same time, a moving range for pressing of the press roller 44 is set within a fixed range.

Abstract: A rate control system to deliver a constant throughput for batt forming equipment that forms the batts by maintaining a pressure gradient across fibers deposited on a rotating condenser screen, the weight of a moving fiber batt is continuously measured as it passes over an inclined slide mounted on load cells. This measurement is converted electronically to a rate value which is then used with the pressure gradient signal to control the delivery of fiber to the condenser screen by adjusting the speed of the feed rolls used to feed the fiber to the condenser screen.

Abstract: An adjustable powder flow gate for a rotary pellet press has a movable gate wherein one dimensional motion of the gate across an opening in a powder flow feed frame on the rotating turret of the press is effected with a rotatable shaft having a screw connection to a member attached to the gate. The shaft is maintained in a selected rotational position with a bias member that is movable between an engaged and a disengaged position. The bias member is adapted to engage a selected detent on a member attached to the shaft having several circumferentially spaced detents when the bias member is in the engaged position. The shaft can freely rotate when the bias member is in the disengaged position. An operator can easily adjust the size of the opening by first disengaging the bias member from the selected detent, turning the shaft to move the gate to the desired position, and then engaging the bias member into a newly selected detent.

Abstract: A method for producing continuously a long reinforced hose having a plurality of reinforcement layers. An inner reinforcement layer is formed by braiding steel wires or fibers on a mandrel and a rubber is extruded onto the inner surface of the reinforcement layer to form an inner rubber layer therein. An adhesion rubber is then extruded onto the outer surface of the inner reinforcement layer to form an adhesion rubber layer thereon and at the same time an outermost reinforcement layer is formed on the adhesion rubber layer by braiding on a mandrel. The unvulcanized hose including the respective layers is pulled at a speed higher than the braiding speed of the outermost reinforcement layer, thereby firmly joining the reinforcement layers and then pulled at a lower speed but still higher than the braiding speed, thereby more firmly urging both the reinforcement layers to each other.

Abstract: In order to guarantee substantially trouble-free operation when manufacturing sandwich elements on a double conveyor belt installation having a downstream cross cutter and cleaning device, the cleaning device disposed on a transport carriage i) is returned to the carriage of the cross cutter to pick up the next sandwich element, is braked and is then re-accelerated to a speed higher than the production speed, ii) is, after reaching a desired distance.

Abstract: The invention refers to a method for the reduction of the sag and/or of the different stress profile of a flattened tubular film web produced by a blown film process and made of thermo-plastic synthetic resin, transversely to its longitudinal direction. For the solution of the problem to provide a method according to which the sag and/or the different states of tension transversely to the tubular film web can be easily reduced or eliminated to a maximum degree, the tubular film web is heated along its width and then cooled and/or stretched. Furthermore, the invention refers to an apparatus for carrying out the method.

Abstract: Apparatus for and method of supplying viscous blends, casting resins for example, of two or more components that react and cure when blended, preferably in a vacuum. There is one holding tank for each component. There is a set of flow controls downstream of each holding tank. There is check valve downstream of each set of flow controls. There is a line downstream of each set of flow controls or of each check valve. Blenders communicate with each line. An injector downstream of each blender supplies the blend to a compression-setting mold. The line leading out of each holding tank and through the flow controls and check valve extends past each blender and back into the tank, accordingly constituting a closed loop that begins and ends at the tanks. The loops extend through FORWARD/DIVERT valves with one intake and two alternatively opening and closing outlets. One outlet forwards the component on through its loop. The other outlet diverting it out of the loop to one of the blenders.

Abstract: An apparatus (10) for extruding a profile material to form a profile (11) of substantially constant cross-section onto the peripheral edge (12) of an article (13). The apparatus (10) includes a movable die head (30) for circumferentially traversing the peripheral edge (12) of the article (13). The die head (30) has a profile orifice (31) positioned proximate to the peripheral edge (12) of the article (13), and a supply channel (50) in fluid communication with both the profile orifice (31) and a pressurized source of the profile material (24) for directing the profile material to the profile orifice (31). The apparatus also includes selectively pivotable vane means (60) positioned within the supply channel (50), wherein the vane means (60) is pivotable to variably direct the flow of the profile material to the profile orifice (31 ) as the die head (30) moves.

Abstract: A control device for an electric injection molding machine designed to advance and retract a screw in a heating cylinder by an injection motor includes a screw position detector for detecting a screw position to output a screw position detection signal, a speed pattern generator for generating a speed setting pattern signal which indicates relationship between time and screw speed. An integration unit integrates the speed setting pattern signal to obtain a moving stroke of the screw. And a generation unit generates a position instruction signal on the basis of the moving stroke and a screw position when injection is initiated. To generate a speed instruction signal, the screw position detection signal is subtracted from the position instruction signal as a manipulated variable of feedback and the speed setting pattern signal is applied to the position instruction signal as a manipulated variable of feed forward. Thus, accuracy at the speed changing positions can be improved, thus improving operability.

Abstract: A continuous process for extrusion of thermoplastic resin of sheets, films, etc., is characterized by introducing devolatilized polymer melt into at least two branch streams, at least one of which is fed to an extrusion device and at least one of the remaining stream is connected to a pressure-adjusting device so as to obtain high quality extrusion products.

Abstract: A process for making porous flexible pipes from two feed streams containing a thermoplastic material and a thermoset material, in which the feed streams are delivered to a die head extruder in a substantially compaction-free and segregation-free manner to insure that the feed composition in the extruder is substantially the same as the initial feed composition. The process can be automated so that an operator can manufacture porous flexible pipes of desired porosity and other rheological and mechanical characteristics by simply entering a command which will simultaneously adjust the process parameters such as the temperature and/or pressure inside the extruder, and the post-extrusion tension to meet the special need.

Abstract: A method of making a window panel with a synthetic resin frame comprising forming a synthetic resin frame by extruding synthetic resin through a die into a specified shape along a peripheral portion of a plate-like material for a window on at least one surface of the plate-like material, and curing the formed synthetic resin frame so that the synthetic resin frame is formed integrally with the peripheral portion of the plate-like material, characterized in that the die is moved to trace a locus along a peripheral portion of the plate-like material which has been previously inputted, and the locus and the angular position of the die are corrected by detecting a position of the end face of the plate-like material, whereby the synthetic resin frame having a specified shape is formed.

Abstract: An injection molding machine utilizing vector controlled AC induction motors in its servomechanism drive systems. Vector controlled AC induction motors provide a cost effective high power drive system which superior performance capabilities. Further system efficiencies are realized when the control is configured to run multiple motors by multiplexing the computer controller circuits for the power sections of each motor.

Abstract: The invention relates to a process and apparatus for the controlled release of metered quantities of finely divided solids with one or more regulated venturi nozzles for the purpose of applying lubricant or separating compound to the stressed surfaces of pressing tools in tablet making machines or for applying finely divided solids to solid carrier materials particularly in the fields of pharmaceuticals, foodstuffs or catalysts.

Abstract: A controller for a molding machine is capable of easily setting control data without considering the speed-control area and the pressure-control area. To achieve the object, the controller comprises: an input unit for inputting speed of a movable section of the molding machine with respect to positions thereof and time, and resin pressure; a memory for storing data, which include the speed of the movable section and the resin pressure inputted; and a control unit for controlling the speed of the movable section and the resin pressure on the basis of the data stored in the memory. In the controller, the speed and the pressure can be inputted independently, and proper control data, which match molding conditions, can be defined easily.

Abstract: A controller for a molding machine can easily revise control-parameters. To achieve the object, the controller comprises: a first input unit for inputting control-parameters of the molding machine; a display unit for showing a graph of a control-pattern of the molding machine, which is defined on the basis of the control-parameters, on a screen; a second input unit for revising the graph on the screen to define a revised control-pattern; a calculator for calculating revised control-parameters, which correspond to the revised control-pattern, when the control-pattern is revised; a memory for storing the control-parameters and the revised control-parameters; and a control unit for storing the control-parameters in the memory, showing the graph of the control-pattern on the display unit, calculating the revised control-parameters by the calculator when the graph is revised, and storing the revised control-parameters in the memory.

Abstract: A screw extruder having a cylinder, an extrusion head, a screw in the cylinder and a motor for driving the screw in rotation has insert members which extend into the cylinder to effect plastification and homogenization of the material being extruded. The web of the screw is provided with annular recesses into which the insert members project. Some of the insert members are stationary, in the form of pins projecting radially into the cylinder, while others are movable so as to vary the extent of their projection into the cylinder. The movable insert members may be pins extending radially into the cylinder and movable radially, rotatable threaded pins extending tangentially into the cylinder, rotatable pins extending tangentially into the cylinder and having non-circular portions in the cylinder, or sector-shaped discs which are movable pivotally.

Abstract: For the continuous manufacture of a compound pipe with a pipe socket including a smooth internal tube and an external tube provided with transverse grooves and welded together with the latter, an external tube and an internal tube are extruded, the latter into the external tube. While the normal compound pipe is manufactured, gas is blown at a slight overpressure into the space beteen the external tube and the internal tube. When the pipe socket is produced, this space is vented so that a full-surface bearing of the internal tube against the external tube is achieved, to which end the internal tube is acted upon from its inside by gas under pressure.

Abstract: A method of continuously forming an integrally molded structure in a multiaxis rotational molding operation including the steps of rotating a multimold section mold assembly about at least three axes. A first freshly formed polymerizable mixture is flowed over surfaces of an enclosed mold cavity within the multisection assembly. Flowing of the first mixture over the cavity surfaces and formation of a first resin therefrom is monitored through optical fibers extending through the mold sections. Second and third freshly formed polymerizable mixtures are flowed over resin formed within the mold cavity. Flowing of the second and third mixtures and formation of resins therefrom are monitored through optical fibers extending through the mold sections. The rotation of the multisection mold assembly is continued throughout the modling operation. Each axis rotation of the multisection mold assembly is monitored individually.

Abstract: A monitoring method capable of properly collectively managing the operating states and operation records of a group of injection molding machines. Monitor data sets delivered from the individual injection molding machines are cyclically detected by means of a processor of a monitor unit, and a plurality of sets of up-to-date monitor data for the individual injection molding machines are renewably loaded into a plurality of data tables. When the preset time of a timer associated with any one of the injection molding machines is up, or when the current injection frequency reaches a predetermined frequency, it is concluded that the monitor data output timing is reached, and whether the monitor data should be printed or displayed on a screen is further determined.

Abstract: An automated system for casting hollow fiber membranes into a variety of prescribed shapes, including spiral, linear, circular and rectangular. The system also has the capability to change the configuration during casting, which increases productivity. A co-extrusion die is rotated over a stationary coagulation bath A computer is used to control the motion of the die to make a membrane with the desired shape The nozzle is oriented in a manner that will compensate for distortions that occur in wall thickness in the area of a bend. In addition, the nozzle's annulus is offset to make the leading portion of the annulus slightly thicker and the trailing portion thinner at the point where the fluids exit the nozzle, which results in a uniformly symmetric wall thickness. A system embodying the invention includes X, Y and .theta.-directional servomotors 1A-1C (FIG. 1), each of which is coupled to an associated position encoder 2A-2C.

Abstract: A novel extrusion method and apparatus are disclosed for varying the width of an extruded article which employs the use of thermal pins in the extruder die body and does not involve the use of any mechanical manipulation of the die configuration.

Abstract: A system for monitoring and controlling the output of extruder apparatus for producing a blown synthetic resin film. An infrared imaging system provides for measuring the temperature of the blown film simultaneously at multiple points on the film between the blowing head and the frost line of the film bubble. The multi-dimensional temperature profile measured by an infrared camera is processed in a computer controller in order to provide control inputs to various components of the extruder apparatus. The extruder apparatus is controlled so as to maintain a desired temperature profile substantially at that which is known to provide a high quality end product.

Abstract: The method of the present invention utilizes a microcomputer in combination with a CRT and a multiplicity of transducers for monitoring process parameters in the operation of a reciprocating device having a linear stroke. A profile of the process parameters including pressure and velocity are generated as a function of stroke length and time and are stored in a non-volatile memory and graphically displayed on the CRT as master traces for comparison with current data profiles. The velocity is calculated by dividing distance transversed with time or by use of a velocity position transducer.