Abstract: An apparatus for the manufacture of pipes having transverse profile features has a machine bed, on which half shells, which can be combined to form a mold, are rotatably and displaceably drivable. The half shells are pressed together on a molding path by guide rails, of which one is displaceable at right angles to the direction of production by hydraulically actuatable drives. Interlockings may be provided in addition, a locking member of which engaging with an associated locking recess.

Abstract: A method of manufacturing a powder molding having a undercut portion, etc. comprises filling a space of a die with a powder, pressing the powder in the space of the die by punches inserted therein through an opening of the die, and withdrawing a undercut portion shaping means from the space of the die for extracting the powder molding.

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: 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: In a machine for injection molding thermoplastic materials in a molding tool by seriatim injection cycles, wherein an injection pressure stage and a subsequent holding pressure stage are employed, and wherein parameters of a change-over point from the injection pressure to the holding pressure have a trend of varying, a method for regulating the trend of the change-over point in each injection cycle, involving (a) establishing upper and lower pressure, and time boundary target parameters for a working window, (b) establishing upper and lower temperature boundary target parameters for a working band, (c) defining the change-over point within said working window, by specifying a pressure, at a given time, (d)measuring the actual pressure at the time of changing from the injection pressure to the holding pressure, and detecting any pressure and time differences from the boundary target parameters of the working window, (e) measuring the actual temperature, and detecting any temperature differences from the bound

Abstract: The present invention relates to an improvement in an injection and compression molding apparatus and a method therefor which comprises the steps of supplying molten resin by injecting it into a cavity formed by molds and compressing the resin by applying pressure. In consideration of problems with respect to the occurrence of sink marks in molded products and the deterioration in precision which are caused by the escape of resin during compression and a change in the cavity distance between two molds, the present invention provides an injection and compression molding apparatus and a molding method therefor which is capable of resolving the problems and stably producing molded products with good productivity. In the present invention, a gate is closed during compression, and a supplemental amount of resin can be injected after the compression step so as to supply the desired amount of resin in the molded article.

Abstract: A mold clamping device in an injection molding machine comprises a first platen for retaining a first mold therein and a second platen for retaining a second mold therein; a platen feeding mechanism for moving said first and second platens relative to each other on said table; electromagnetic coils arranged on the opposite surfaces of the first and second platens; and a control device for controlling the amount of the current supplied to the electromagnetic coils. The mold clamping operation is carried out using the magnetic attracting force generated by the electromagnetic coils.

Abstract: An injection molding method using an injection molding machine in which a plurality of control parameters including the injection speed, injection pressure and the mold opening degree are controlled, from a moment immediately before filling up of the mold cavity with the resin, setting the parameters in an order determined in accordance with the characteristics demanded by the resin, such that, when the injection pressure is controlled as a commanding parameter, the injection speed is controlled as a subordinate parameter under a given restriction and, when the mold opening degree is controlled as the commanding parameter, the injection pressure is controlled as a subordinate parameter under a given restriction.

Abstract: An injection shaft of an electrically operated injection molding machine is entirely controlled based on its positions. In the injection process, an injection speed is changed over in accordance with a screw position for the processing at the injection process. In the subsequent dwell process, the screw is axially driven by a servomotor, a pressure applied to the resin is detected, and a difference between the pressure and a dwell pressure which has been set is found. The amount of movement in response to the difference is output to the servomotor for the drive thereof so as to keep the screw at the position. As a result, the dwell pressure is controlled by the screw position. Moreover, also in the metering process, the resin pressure is detected, and the screw is moved according to a difference between a set back pressure and a detected resin pressure so as to correspond with the back pressure which has been set.

Abstract: A pressure feedback system for limiting pressure and a minor feedback system connected to the pressure feedback system are used as a speed feedback system for controlling an injection speed. Consequently, the injection speed is controlled on the basis of an injection speed setting signal using the minor feedback system, and a filling pressure is controlled on the basis of a limit pressure setting signal using the pressure feedback system for limiting pressure. Also, a switch for selectively activating the pressure feedback system and a comparator for comparing the limit pressure setting signal with a filling pressure detection signal are provided within the pressure feedback system. The switch activates the pressure feedback system when the filling pressure detection signal is equal to or larger than the limit pressure setting signal. A normal injection speed control operation is performed until the switch activates the pressure feedback system.

Abstract: A hydraulic press includes a fixed mold, a movable mold movable closely to or separately from the fixed mold, a hydraulic cylinder for moving and pressing the movable mold, and a hydraulic circuit for controlling the supply of a pressing oil in the hydraulic cylinder. The hydraulic circuit includes: a variable capacity pump connected to the hydraulic cylinder by an oil tube through a solenoid direction switching valve; a solenoid proportional flow control valve interposed on the way of an oil tube bypassing the solenoid direction switching valve; a detecting sensor for detecting the position or speed of the movable mold; a speed setter for setting the pressing speed of the movable mold; and a controller for comparing the output value of the detecting sensor with a speed set-up value thereby adjusting the opening of the solenoid proportional flow control valve.

Abstract: An apparatus and method are provided for guiding steel bands of a continuously operating press about a longitudinal axis during operation of the press without overstretching one side of the steel bands. First and second bands are guided, via driving drums and return drums, around a pressing ram and a pressing table, respectively. The steel bands are supported, with an adjustable pressing gap, on a plurality of co-rotating steel rods which are guided, with their axes of rotation extending transversely to the direction of travel of the bands, against abutment lugs of the table and the pressing ram. The axis of at least one of the drums is altered in a first direction through an angle .alpha..

Abstract: An apparatus for indirectly measuring relatively long, linear distances associated with the operation of an injection molding machine. In particular, the method and apparatus of the present invention can be used to determine the distance between two machine components or systems that are capable of relative (linear) movement. The apparatus includes a rigid bar that extends over the distance traversed by the components of interest, the bar being oriented at a slight angle relative to the line of movement. Immediately adjacent the bar is a sensing element capable of accurately determining the relatively short distance between the sensor and the bar. It is contemplated that the bar would be associated with one of the machine components and the sensor connected to the other. Given that there is only linear movement between the components, the distance between the sensor and the bar will be proportional to the distance between the two machine components.

Abstract: In a hydraulic circuit a positive-displacement pump has a flywheel. An actuation motor is attached to the positive displacement pump. The pump is capable of directing liquid flow either towards the tank or towards a hydraulic cylinder. The control of flow direction is determined by a first valve which is connected on the output side of the pump in order to discharge the flow of the positive displacement pump either to the tank or to the cylinder. The opening speed of the first valve is controlled. A bistable valve feeds the pilot line of the first valve. A distribution valve, connected with the output side of the pump feeds two pressure lines.

Abstract: A method and apparatus for forming compressible material into discrete solid blocks or briquettes in which the material is compressed in a compression chamber by a pre-press ram and a main ram. A control system is provided which includes sensors for generating signals that are a function of the density of the compressed and densified material within the compression chamber, and an arrangement which is responsive to the sensors is provided for varying the operation of the material feeding device to change the volumetric flow of material fed to the compression chamber in response to predetermined changes in the density of the material in the chamber.

Abstract: The invention includes a blowing agent composition useful in the production of insulating styrenic foams comprising ethylchloride, propane and a halogenated ethane selected from the group consisting of 1,1,1-trifluoro-2-fluoroethane, 1-chloro-1,1-difluoro-2,2,2-trifluoroethane 1-chloro-1,1-difluoroethane (FC-142b) and mixtures thereof. The invention further includes a method to produce dimensionally stable insulating styrenic foams using the blowing agent composition by confining operating temperatures within a narrow range. The blowing agent composition has a significantly reduced ozone reactivity potential compared to previous commercial styrenic foam blowing agents.

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: A method for controlling and monitoring instrumentation for a multilayer tablet press mechanism is disclosed. The compression for each layer, other than the first, takes the measured variable or error from the previous layer control loop and applies a transformation to that variable or error. The resulting transformation is then used as a compensation to the subsequent layer control loop in the form of a modified set point, modified measure variable, modified error, or modified control output. Additionally, the variable or error resulting from the previous control loop is fed back into the controller for the previous control loop so that any adjustments necessary in the previous layer loop may be completed. The variable or error is also used to determine whether to accept or reject the tablet.

Abstract: Process of making building block members by mixing natural latex with shredded vehicle tires to form a mixture, placing the mixture in a mold, applying pressure to compress the mixture, and maintaining pressure for a time period during which the latex hardens and cures.

Abstract: A tire vulcanizing machine includes a bladder; an upper clamping ring for holding the upper end of the bladder; an upper clamping ring for holding the upper end of the bladder; a first lifting mechanism for vertically moving the lower clamping ring; a second lifting mechanism for vertically moving the upper clamping ring; a loader for holding a green tire so as to surround the bladder extended between the upper and lower clamping rings with the horizontal center plane of the green tire in coincidence with the middle point between the upper and lower ends of the bladder; a third lifting mechanism for vertically moving the loader; and a controller for controlling the operation of the first, second and third lifting mechanisms.

Abstract: An improved tire section repair unit for the repair of a damaged section of a tire. The repair unit includes two curved side walls pivotally connected to the base of the unit. A locking arm is provided that securely encloses the entire system of curved walls, base and internal air bag and heat pad arrangement situated about the tire under repair. The pivotable side wall design permits the repair of tires of varying sizes. A locking arm arrangement permits the use of lightweight side walls to enclose the system. As a result, the repair unit of the present invention is more transportable and less cumbersome to use.

Abstract: A device for controlling the thickness of a sheet in calendering includes a thickness measuring unit for measuring the thickness of the sheet immediately after it has been formed by a pair of calender rolls, and a roll adjusting unit for moving at least one of the pair of calender rolls toward and away from the other calender roll. The device further includes a detection unit for detecting change in distance between the axes of the pair of calender rolls, and a control device for comparing the measured thickness of the sheet with a target thickness to obtain a difference therebetween. The control device then calculates a gap adjusting value on the basis of the difference, and compares the change in distance between the axes of the rolls detected by the detection unit with the calculated gap adjusting value. When these values become equal, the control device stops the movement of the one calender roll to make the thickness of the sheet equal to the target thickness.

Abstract: A method of controlling holding pressure in an injection molding operation and an apparatus therefor, wherein the quality of molded products can be controlled with a high accuracy without the need for a pressure sensor in a mold and without requiring any additional data such as the thickness of a molded product, the effective heat diffusion rate, and so on. Further, a method for estimating resin temperature in injection molding and an appartus therefor, wherein in-mold resin temperature in a holding pressure and cooling stage is estimated during injection at a high speed and with a high accuracy.

Abstract: A method and an apparatus for monitoring injection pressure, using the relationship between positions of a screw (1), filling of resin in a cavity and injection pressure. Mold cavity data are stored, whereby a display screen (2) displays, based on said data, a configuration of the cavity and straight lines corresponding to cross sections along which the cavity is divided into a plurality of regions. Screw positions required to sequentially fill the divided regions of the cavity with the resin are obtained to be displayed on a coordinate axis representing a screw position in a pressure waveform graph (22). Then an operator changes the setting of molding conditions referring to the data on the display screen, and carries out the injection to obtain the pressure data corresponding to the screw position to be displayed on the pressure waveform graph (22).

Abstract: A power molding press is controlled, in which a stepped mold product having a plurality of stepped portions is molded by compressing powder within a mold by relatively moving an upper punch assembly, a lower punch assembly including a plurality of lower punches arranged concentrically with each other and the mold by detecting a speed ratio of moving speeds of the upper and lower punch assemblies moved by the respective driving sources at a time of compressing the respective stepped portions of the mold product during a compressing time from a pressing start time to a pressing completion time, detecting positions of the upper and lower punch assemblies and the mold, detecting a compression ratio of compressed dimensions of the stepped portions of the mold product, and controlling the respective drive sources to control the relative moving speeds of the upper punch assembly, the lower punch assembly and the mold so that the speed ratios substantially accord with the compression ratios of the respective stepped

Abstract: A method and apparatus for injecting and mold clamping control of an injection blow molding machine, wherein a parison injected downward from a die between mold halves defining a cavity is detected to thereby determine the dynamic locus of its free end. In every run the mold clamping is commanded to start before the end of injection is commanded and is effected according to the clamping operational conditions determined based on the parison locus determined in the instant or preceding run. In one method a clamping starting time is determined by a calculation with a predetermined clamping stroke speed. In another alternative method an initial clamping stroke speed is determined by a calculation with a predetermined clamping starting time and following stroke speed.

Abstract: A plastic material, controlled at a desired temperature, is fed on an upstream side of a gap between a pair of rotating forming rolls arrayed almost in parallel and controlled at a desired temperature from a device for feeding the plastic material. The plastic material is pressed and formed into a sheet by the forming rolls therebetween while forming a bank or an accumulation of the plastic material on an upstream side of the gap of the forming rolls and is carried out on a downstream side of the gap. The bank quantity monitoring is performed by measuring a temperature of the sheet carried out through the gap of the forming rolls and estimating the quantity of the bank in accordance with measured temperature information. The sheet formation is performed by measuring a temperature of the sheet carried out through the gap of the forming rolls and controlling various forming conditions according to a measured temperature information.

Abstract: A method of detecting the characteristics of resin in an injection molding machine having an on-off operating mechanism for the flow path of the resin and a method of controlling the weight of the injected resin on the basis of the detected characteristics of the injected resin. Such an arrangement is adopted that, in a state where the aforesaid flow path on-off operating mechanism is closed after the resin in plasticized and measured, processes, in which urging forces of predetermined urging values p.sub.o, p are applied to the screw to balancingly move the screw until it stops, are successively carried out under a given molten state value Z of the resin, and the relationship between the urging value p.sub.o, p and the moving distance S.sub.T of the screw are approximated by a given functional equation, to thereby obtain the relationship between a molten resin pressure P and a molten resin volume.

Abstract: A method of detecting the filling weight for an injection molder, or specifically to a method of detecting the weight of the plasticized synthetic resin injected from the injection molder cylinder to fill the cavity of a mold. The object is to ensure highly accurate detection of the filling weight on the injection molder side, in continuous molding production. The weight of the resin injected from the cylinder to fill in the cavity is detected through operations on the basis of the positional values of the screw and the pressure and temperature valves of the resin obtained before and after injection, with the resin pressure maintained at a specified value and with the block valve and check valve closed.

Abstract: To determine and/or automatically control the degree of orientation of tubular films which have been made in a film-blowing plant including an extruder having a film-blowing head and apparatus for internal cooling and also including flattening and take-off apparatus, the rate of exchange of the air for internal cooling, the speed of the extruder, the temperature of the plastic composition being extruded and/or the take-off velocity are controlled. To ensure that the degree of orientation can be determined and/or automatically controlled in a simple manner and without an occurrence of trouble, that shape of the flaring portion of the bubble which corresponds to the desired degree of orientation is determined and/or adjusted and is recorded as the desired shape of the bubble. The actual shape of the flaring portion of the bubble is detected and compared with and adapted to the desired shape.

Abstract: A method of detecting the amount of plasticized synthetic resin injected from the cylinder of an injection molder to fill the cavity of a mold. The objective is to ensure a high accuracy in detecting the injected amount, on the injection molder side, in continuous molding production. The injected amount is detected by obtaining the resin amount in the cylinder before and after the injection process, under the condition that the resin pressure is kept at a predetermined value under the block valve and check valve closed.

Abstract: An injection control method for controlling the weight of a plasticized synthetic resin injected from the cylinder of the injection molder to fill the cavity of a mold. An object of the invention is to offer the method for keeping the quality of the products constant even if there is an influence by outside disturbances or there is a change in the given conditions, such as the molten resin pressure. Another object is to offer a method wherein a study and an analysis from the beginning is not required, different from the adaptive control, in case of the change of the mold. The travel distance S.sub.D of the screw to the position for injecting the plasticized synthetic resin by the amount corresponding to the weight value G of a product is calculated by a specified calculation formula and preset. And the injection of the plasticized synthetic resin into the mold cavity is stopped when the screw has moved for the preset travel distances S.sub.D from the stop position immediately before injection.

Abstract: A system for controlling the shaping fluid pressure in tire bladders in a tire molding press which senses the fluid pressure in the bladder used to shape the tire being loaded into the tire press; compares the sensed fluid pressure in the bladder with the desired set point fluid pressure to be maintained in the bladder; and adjusts the fluid pressure in the bladder in response to the compared pressures to cause the fluid pressure in the bladder to be maintained at the desired set point fluid pressure.

Abstract: An apparatus and method are provided for guiding steel bands of a continuously operating press about a longitudinal axis during operation of the press without overstretching one side of the steel bands. First and second bands are guided, via driving drums and return drums, around a pressing ram and a pressing table, respectively. The steel bands are supported, with an adjustable pressing gap, on a plurality of co-rotating steel rods which are guided, with their axes of rotation extending transversely to the direction of travel of the bands, against abutment lugs of the table and the pressing ram. The axis of at least one of the drums is altered in a first direction through an angle .beta..

Abstract: A method of controlling the extrusion of a multilayer parison so that the injection pressure for an auxiliary resin and that for an adhesive do not act on the annular fluid passages while a main resin, an auxiliary resin and an adhesive are stored in a main resin accumulator, an auxiliary resin accumulator and adhesive accumulators, respectively. The injecting pressure difference between each pair of auxiliary resins and the adhesive is maintained within a prescribed range and the injection of the resins and the adhesive from the accumulators is terminated simultaneously for all the materials.

Abstract: An injection compression molding method and an apparatus therefor are provided, which are capable of accurately performing a molten resin compression operation during execution of an injection/hold operation or a metering operation, so as to produce high-quality molded products with no substantial variations between these products.

Abstract: A process and apparatus for the production of hollow bodies from thermoplastic material by means of blow molding uses a blow molding mold which includes at least first and second mold portions to enclose a generally tubular extruded preform which is expanded within the mold under the effect of an increased internal pressure within the preform. To provide for asymmetric closing and/or opening movements of the mold portions relative to the preform, the blow molding mold is displaced as an entirety parallel to the direction of the opening and/or closing movements of the mold portions, more especially during the mold closing and/or opening procedure, so that an additional motion is superimposed on the movements of the mold portions.

Abstract: In order to control the opening and closing movement of an injection mold (1, 3) and the feed and extraction movement of a handling device (7) for the removal of the molding in a manner which is optimally concerted with no delay, the opening movement of the mold and/or the extraction movement of the handling device is detected in relation to position and speed; if the speed lies in a reference range, a release signal is generated which triggers the feed movement of the gripping device or the closing movement of the mold.

Abstract: A method of manufacturing a molded resin foam by charging pre-expanded resin pellets into a cavity of a mold and subjecting them to expansion molding. In order to minimize differences in weight of the foam from product to product, the method is characterized in that prior to charging, the apparent density of the pre-expanded resin pellets is measured and, upon charging, the cracking width of the mold is regulated, on the basis of the measurement result, to a definite value determined depending upon the apparent density, whereby the weight of the pellets charged in the mold cavity is made constant.

Abstract: A system of injection-molding a super-precision product by an injection machine with a mold comprises conventional fundamental steps including a material plasticizing and metering step, an injection step and a material pressure-holding step, with additional features in that a nozzle passage, enlarged in volume, extending from a machine body to a cavity gate is interrupted midway therealong by a valve from communication with the interior of the body, after the injection step but while the pressure-holding step is being carried out. The pressure-holding step is carried out at least using the valve for exerting an internal pressure on a forward portion of the injected material separated due to the passage interruption, and compacted in a fixed closed space limited by the valve including a mold cavity, during which step a next plasticizing and metering step is commenced.

Abstract: The critical dimensions of product samples made during a standard certification procedure for an injection molding process are measured and a loss factor value is computed for each such dimension. Using statistical techniques, the largest loss factor value is partitioned into percentages of loss contributed by a predetermined set of loss elements. The loss element contributing the largest percentage is corrected so as to improve the quality of the process and the product. The method provides a way of determining what kinds of process corrections will most effectively improve product and process quality.

Abstract: A method of controlling an injection molding machine in which change in the forward movement velocity of an injecting screw or change in the filling pressure is detected at the time of performing switching from the filling process to the packing process, commencement of the packing control is hastened if the change in the velocity or the pressure is reversed, while the commencement of the packing process is delayed if a determined level is not realized within a predetermined time from the commencement of the packing control. When the injection molding work is performed, switching from the filling process to the packing process can be easily performed at a proper time and therefore high quality products can be easily mass-produced.

Abstract: A molding system including a mold and a molding machine has been adapted to monitor the position of mold element surfaces that move relative to each other to form a mold cavity. The system includes a source of gas under pressure and orifice-forming sensors on a first mold element to direct a flow of pressurized gas from the first mold element. A monitoring system monitors the condition of the gas remote from the first mold element to indicate the spacing between the first mold element and one or more adjacent mold elements as the mold elements move with respect to each other.

Abstract: A rotary plastic blow molding machine (20) including a base (22), a wheel (24) mounted for rotation on the base about a rotational axis A and a programmable logic controller (PLC) (100) mounted on the wheel for rotation therewith to control operation of a plurality of mold stations (40) on the wheel. The blow molding machine (20) as disclosed also has at least one sensor (62) mounted on the wheel (24) for rotation therewith to sense an operating parameter of each mold station and to generate an associated operation signal. The PLC (100) is coupled to the at least one sensor (62), processes the sensed operation signal and controls the machine (20) operation in response to the signal.

Abstract: Continuous process and apparatus form products from thermoplastic materials between top and bottom mold carriages. A flexible silicone rubber mold on a fiber belt continuously moves around each carriage frame. A surface of desired shape on one rubber mold mates with the desired shape of an opposed rubber mold forming a continuously moving mold channel into which is fed hot thermoplastic material at moldable temperature. After discharging the molded plastic product from the moving mold channel, localized surface heat in the molds resulting from contact with hot plastic is removed from the belt molds by air blown onto mold surfaces. Each carriage frame includes a back-up plate coated with low friction coefficient material over which slides a continuously moving belt mold. These slippery plates have numerous air-bearing holes feeding high pressure air between them and the respective moving fiber belt for reducing friction and wear.

Abstract: Installation for the automated manufacture of transmission belts, having equipment for the preparation of a multi-belt sleeve including at least one coiling machine (SP) on toothed drum, a calendering machine (CL1) for the application of a rubber composition, a molding and curing station (V1) and a final station (FN) having at least one checking machine (CQ) connected to a central control unit (UCC). The checking process is based on the use of a narrow range of tolerance wherein the values of the magnitude under control are acceptable, and of a wider range of tolerance external to the previous one, wherein the values of the magnitude are acceptable in a conditional manner, for example, in relation to the time of permanence within such range, and in any case after a final verification of the product affected by the anomaly.

Abstract: A mold opening controller for injection molding machines, having a control unit for controlling the hydraulic circuit. The control unit having a setter for setting acceleration/deceleration functions of a movable portion such as the movable mold; a data input for the setter; an operational unit for calculating the acceleration/deceleration of portions of the movable mold and the acceleration/deceleration speeds at each moving position at the time of the acceleration/deceleration on the bases of data from the setter and the data input; a position sensor for detecting the moving position of the movable mold; and a control for controlling the hydraulic circuit so that acceleration/deceleration positions of the movable mold and its moving speed at each position correspond to the output values of the operational unit through the position sensor.

Abstract: An injection molding machine control device where mold element separation distance is measured and integrated as a function of time while moldable material is being introduced in the mold cavity between the mold elements. When the integral value reaches a preselected value, the mold injection pressure is changed and the moldable material is allowed to cure within the cavity.

Abstract: A method is provided for checking a pickup load cell in a tablet-making machine which detects the compressive force applied to a tablet being formed. According to the method, a dummy tablet-forming die formed on a support block is inserted into a selected one of the die-receiving holes formed in a rotary table in place of a real die. A reference load cell is put on the support block, and the reference load cell and the support block are sandwitched between an upper pressure rod in place of an upper punch and a lower pressure rod in place of a lower punch. Measurements are made by both the pickup load cell and the reference load cell as the reference load cell is compressed between a pair of pressure rollers, and the value of the compressive force detected by the pickup load cell is corrected in accordance with the value of the compressive force detected by the reference load cell.

Abstract: A method of monitoring maximum pressing forces of a pelletizing machine provided with a rotatable matrix disc and plungers, involves the steps of supplying values corresponding to pressing forces applied by plungers for evaluation in a computer so as to control a deviating device, detecting a position of the matrix disc continuously by an angle pulse transmitter and releasing pulses by the latter to supply the pulses to the computer, and coordinating the pulses with predetermined maximum pressing force values and supplying to evaluation. The pelletizing machine has a rotatable matrix disc, plungers whose maximum pressing forces are supplied for evaluation, a computer to which the maximum pressing forces of the plungers are supplied for evaluation, and an angle pulse transmitter supplying pulses released by the matrix disc during its rotation into the computer for an association to measured maximum pressing forces.