Abstract: A gyratory shear material compacting device in which a material sample is placed within a cylindrical mold having a wobble plate. The material sample is compressed by a piston while the mold is simultaneously gyrated. Gyration is achieved by tilting the mold and holding the wobble plate within rollers which revolve around the mold, controlling the selected angle of tilt while imparting oscillatory gyration. The selected angle of tilt of the mold may be precisely controlled at all times, preventing the mold from riding up on the sample, or from coming into contact with the base of the device. The mold is free to advance rotationally. The device is capable of measuring and recording the height of the sample, angle of gyration, and moment of gyration.

Abstract: Apparatus for the quality control of individual, one-piece receptacles, which are open at one end. The individual, one-piece receptacles are preferably aligned, in several groups, side by side, similarly with respect to their spatial orientation. The receptacles are turned over to a conveyor line where they pass through at least one testing station at which measurement results specific to each type of receptacle are obtained. The analysis of these results indicates the structural integrity and accuracy of shape of the respective receptacle. The receptacles, as a function of the receptacle-specific measurement results, are removed from the conveyor line if defective; and only the structurally integral and shape-accurate acceptable receptacles are stacked and further advanced as a stack.

Abstract: Device to collect and convey plastic strands, issuing from nozzles, on a discharge plate, over which cooling water flows, with a device to indicate the undisturbed passage of the plastic strands over the discharge plate or their accumulation on the discharge plate. At least one temperature-dependent electric resistor, which triggers a signal by way of a threshold value switch when the specified temperature is exceeded, is attached to a cooling water-free zone on the underside of the discharge plate in the region of impact of the plastic strands.

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: A molded workpiece is formed using a mold having an inner cavity, an injection port which communicates with the inner cavity for permitting molding material to be injected into the inner cavity, and at least one disposable vent line. The vent line has sidewalls which are substantially transparent to light and provides for venting gases from the inner cavity as molding material is injected into the cavity. A material injector is coupled to the injection port for injecting molding material into the inner cavity through the injection port. A removably sensor receives the disposable vent line for detecting when molding material has substantially filled the vent line and for generating a first signal indicating that the vent line is substantially filled.

Abstract: An apparatus for portioning dough has a filler hopper (31) for the dough in which hopper a pre-portioning tool (51) in form of two star rollers (32) is disposed which rotate in inverse direction and are driven by a drive device if the amount of dough in a chamber (30) below decreases a predetermined value. From this chamber the dough (30) is pressed by a pusher device (25) in receiving openings (4) on the periphery of a step-wisely rotated drum (2). The volume of dough in the chamber (30) is controlled by a capacitive sensor (35) embedded into the wall (36) of the filler hopper (31) so that this sensor (35) does not interfere with the stream of the dough.

Abstract: An in situ curometer has been developed to follow the cure of thick articles during molding, by measuring continuously the dynamic mechanical properties (shear modulus and loss angle). The apparatus is designed to provide cure data on curable articles such as rubber products and components in situ, during the curing of the article, to improve manufacturing cure efficiencies. The curometer is a small-scale version of an Oscillating Disk Rheometer, designed to operate through a mold wall. An approximate theoretical treatment has been developed to relate the observed torque and loss angle to the dynamic properties of the rubber compound.

Abstract: A device for measuring the position of a conductor in an enveloped cable, preferably directly after extruding the plastic envelope, in which at least a supporting means for a sensor is continuously engaging the periphery of the envelope and in which the sensor determines the distance between the conductor and the sensor, and wherein the output signal of the sensor is delivered to a processing and displaying means, wherein the supporting means is defined by a roller driven by the cable which roller is yieldingly supported normal to the rotational axis.

Abstract: In a first forming stage, the bottom portion of a mono-molded plastic syringe (a type wherein the whole portion, i.e., a main syringe body and a needle portion, is molded unitedly in a cast) is heated and then stretched to a certain length, forming the edge portion like a needle, while the syringe is intermittently moved. Then the sryinge is carried to a second forming stage, where the syringe is moved intermittently and the needle portion is heated, then it is bent at a certain angle and is cut in a certain length, forming a completed syringe.

Abstract: A method and an apparatus for monitoring the process stability of an injection molding machine having a reciprocating screw engaged in the plasticating of a moldable material in preparation to its being introduced into the mold cavity. The invention involves the measurement of the duration of the operation of the screw engaged in the plasticating of the moldable material and includes the analysis of this duration over a period of time thus providing the supervisor with the necessary information to determine whether the machine/process is meeting or deviating from the desired operating requirements.

Abstract: A rotary powder compression machine with a horizontal turntable for compressing powder placed into a compression bore between an upper and a lower compression rods. An ultrasonic sensor monitors the amount of powder deposited upstream of the open feed shoe in the rotation direction of the turn-table.

Abstract: The meat duct (6) is equipped with a gate (17) to cut the meat supply at intervals and with a plate (14) to regulate the passage of the meat (7). The sheet material paper rolls (9, 10) to wrap the hamburger have respective inertial brakes (26) and sensors (25) which, when the paper runs out, touch the core (23) of the roll and stop the machine. One of the paper strips bears a series of marks (20) which, as they pass through the cell (21), cause the pressing die mechanism (11) to operate. In addition, there is a rod (40) which separates the chopped meat end contiguous to the hamburger, and another rod (41) which, when it ascends due to an obstruction, touches a microswitch and stops the machine. The paper scraps left over are driven by a pneumatic system (35) to a container (37).

Abstract: A method and apparatus for forming finished cups of expanded resin comprising a transfer mold capable of transferring a preformed article obtained through a preforming process to a finish-forming mold, and simultaneously collecting from the finish-forming mold a finished article obtained through compression forming and discharging the finished article after inspection, the transfer mold for transferring having a core section for collecting the preformed article and transferring the preformed article to the finish-forming mold and a cavity section for collecting and discharging the finished article and apparatus for moving the transfer mold.

Abstract: A mouthpiece discriminating device for a rotary roll extruder serves to distinguish different kinds of exchangeable mouthpieces from one another without relying upon visual inspection. The device includes a plurality of magnets embedded in the mouthpiece along its edge and aligned with each other in a direction of passage for the mouthpiece. The poles of the magnets are arranged as coded information uniquely determined in accordance with kind of the mouthpiece. A detector element provided along the passage detects the magnetic fields of the magnets upon movement of the mouthpiece along the passage. A signal processing unit discriminates the kind of the mouthpiece based on output signals of the detector element representing the magnetic fields detected.

Abstract: The machine has a tube extrusion head, an entrainment device arranged downstream of the extrusion head along the extrusion direction, and a device for checking the outer diameter of the tube. The device for checking the outer diameter of the tube includes a pneumatic gauge which is interposed between the extrusion head and the entrainment device and is operatively connected to an electronic control unit which acts on the entrainment device to adjust the tube entrainment speed as a function of the outer diameter of the tube to be obtained.

Abstract: A device for vulcanizing or cross-linking a cord particularly a cable provided with a plastic covering, the device comprising an elongated pipe housing at the upper end of the housing, the cord being inserted and the upper area thereof being defined as a heating area and the lower area thereof as a cooling area wherien at least the heating area is provided with an inlet and an outlet for a protective gas, and an inspection window fitting positioned laterally at the pipe housing adjacent to the upper end for inspecting or measuring, respectively, the diameter of the cord by means of a suitable optical-electrical measuring device through an inspection window, wherein a separate heating device is associated with the upper area of the heating area of the pipe housing associated with the inspection window fitting, the heating device heating the atmosphere in the upper area permanently to a temperature higher than in the remaining areas of the heating area.

Abstract: An injection screw disposed in a heating cylinder is connected to a rotary driving force receiving mechanism, a linear driving force receiving mechanism, and a back pressurizing mechanism. The rotary driving force of an electric motor is transmitted to the rotary driving force receiving mechanism and the linear driving force receiving mechanism through clutches, which are controlled according to sensors for detecting the position of the screw or the linear driving force receiving mechanism.

Abstract: A device for continuously measuring and correcting a tackiness of a sheet of rubber material including a feeding unit for continuously feeding an unvulcanized rubber sheet along a flat support surface and a rotatable roller in contact with the unvulcanized rubber sheet, whereby the roller is rotated by the movement of the unvulcanized rubber sheet, and entrained in the sheet feed direction due to a tackiness of the unvulcanized rubber sheet. A load cell is connected to the roller via a linkage, for measuring a resistance to the rolling of the roller, i.e., a change of a position of the roller entrained in the sheet feed direction.

Abstract: A loading elevator for a multi-platen press is provided with a pusher which simultaneously transfers a number of transport plates loaded with stampings to the press. After press operations are completed, the plates are unloaded by an extractor to an unloading elevator. The pushing and the unloading of the plates are automatic, with sensors provided to halt the loading and unloading in the event of excessive resistance to the movement of any one of the plates. A plurality of sensors are provided in the pusher and in the extractor, one sensor there for each of the plates. Each sensor is connected to halt the operation on recognition by the sensor that an express resistance exists and if desired to provide a signal that the halting has taken place.

Abstract: A food scoop is disclosed which disposes a temperature sensor in or on a spoon portion (which includes a handle), which is utilized for the scooping operation. The temperature sensor includes a counting mechanism that records the temperature changes of the spoon and uses them as a counting impulse. Most foods, whether such foods be ice cream or heated selections, have sharp temperature gradients which are counted and recorded by the scoop portion of the invention. The number of temperature changes counted by the counting mechanism equals the number of portions of a particular food which have been served.

Abstract: In a combined injection-molding and pressing machine according to the present invention, an injector (10a) of horizontal injection apparatus (10) is disposed below a stationary die plate (2) of a vertical press (1), an injection nozzle (10b) of the injector (10a) is formed into an L-shaped, and the injection nozzle includes a valve (10c) for opening and closing a resin passsage. Corresponding to extension and contraction of the horizontal injection apparatus (10), a base (14) of a platform (4) mounting thereon the horizontal injection apparatus (10) is allowed to slide about the injection nozzle (10), and the L-shaped injection nozzle (10b) is caused to contact with a lower mold (3) at a predetermined surface pressure. Therefore, color changing and purging of resin is more efficient and complete. No need of a hot runner permits to employ an inexpensive and versatile mold that is more widely used in common.

Abstract: In a device for making shaped objects from plastic refuse plasticized in a roller extruder under pressure and ejected from the nozzle of the extruder a plurality of molds are provided transported to the extruder, filled thereby and transported therefrom. Each mold has at the end face a plate having a filling opening. During the filling process this plate sealingly overlaps the surface surrounding the nozzle so that the mold can be filled with plasticized plastic under the pressure generated in the roller extruder.

Abstract: A press that includes a pair of die sections and a ram for propelling one of the die sections against the other to form a workpiece positioned therebetween. A die cushion is coupled to one of the die sections for cushioning force of engagement of the die sections, and includes at least one gas cylinder and a manifold for feeding gas under pressure to the cylinder. A pressure monitor includes a pressure sensor coupled to the manifold for supplying an electrical pressure signal as a function of gas pressure in the manifold. The pressure signal as compared to a predetermined threshold for supplying an alarm signal when gas pressure in the manifold is less than such threshold, and ram operation is stopped when the manifold gas pressure is less than the preset threshold.

Abstract: An injection molding device and a method for manufacturing a foil decorated molding use a first half of a mold and a second half of a mold with a transfer foil having a transfer layer on a substrate film transported into a space between the first half of the mold and the second half of the mold. A heating and removing device has a heating device and a molding removal device moved into the space to hold, with the removal device, a molding attached temporarily to the first half of the mold, and to heat the foil at the side of the second half of the mold with the heating device. When the first and second halves of the mold are closed, the heating and removing device is moved outside the space to remove the molding from the removal device.

Abstract: An apparatus for the extraction of melt samples, particularly from continuously operating plastics processing plants, has a test sample mould which is connected to a melt channel via a transfer channel. There are provided a shutoff device and a device for transferring the melt into the mould. In the transfer channel there is arranged a suction piston which sucks the melt out of the melt channel into the transfer channel which in this case is opened simultaneously. In addition, there is provided a pressure piston for injecting this melt into the moulding chamber. An apparatus of particularly simple construction is created in this way and permits extraction of melt samples without the melt coming into contact with the atmosphere, no dead spaces at all being created at the same time in the melt channel during the time when no melt samples are extracted.

Abstract: A thickness measurement of non-metallic material molded bodies, particularly, walls of tubular ceramics or plastics, can be simply performed with a high precision, by interposing such a molded body between a metal and a measuring probe, such as a solenoid coil, generating an alternating magnetic field, and measuring an energy loss of the magnetic field which depends on the thickness of the molded body. The energy loss can be measured by detecting a variation of voltage of an A.C. bridge circuit including said coil as a component.

Abstract: A device for measuring the wall thickness of an extruded tube by means of ultrasonic pulses comprises a tube wall thickness measuring instrument being rotatable about the circumference of the tube and being connected to an arm extending in a plane perpendicular to the tube. The arm is hingedly connected in said plane to a ring perpendicular to the axis of the tube and concentrically about the tube. The arm bears a weight outside said ring. An adjustable pressure element, such as a spring or preferably a two way operable air cylinder, acts upon the arm.The measuring element may engage two supporting faces, the angle between the supporting faces being adjustable.Furthermore a detachable fixing element, such as a magnet, engages the arm so that the arm can be disconnected from the magnet and may be moved from the plane perpendicular to the tube.The wall thickness is measured only by means of one echo coming from the inner wall of the tube when an ultrasonic pulse emitted by the device hits said wall.

Abstract: The weight regulator for an injection moulding machine (1) to be controlled by a process regulator (13) comprises a circuit arrangement (15) for determining a final pressure adjustment value from the predetermined nominal weight of the injection-moulded parts to be manufactured by the injection moulding machine (1), a subtraction device (16), which forms the difference between the nominal weight and the actual weight of the injection-moulded parts produced by the injection moulding machine (1) delivered by an analytic balance (12), an integrator (17) for producing a correction value from the difference between the actual weight and the nominal weight an an adder (18) which is connected between the circuit arrangement (15) and the process regulator (13) and which adds the correction value to the final pressure adjustment value so that a nominal value of the final pressure is obtained that can be supplied to the process regulator (13).

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.

Abstract: The present invention discloses a method for determining the level of contamination in electrical cable insulation. This is achieved by extruding the cable insulation about the conductor and simultaneously producing a thin ribbon of the insulation which is then screened via a laser beam for contaminants.

Abstract: Method and Apparatus for cooling a mold having plural parallel cooling passages therethrough, the mold having flow control means at the inlet and sight glasses at the outlets and being arranged for overfeed so that liquid is always present in all cooling passages to avoid hot spots in the mold.

Abstract: Means for polarizing ferroelectric materials up to a predetermined polarization level include the application of an electric field E to these materials. According to this method the ferroelectric material is subjected to an alternating electric field E, the frequency of which ranges from about 0.001 to 1 Hz, and which is made to increase gradually and in a cyclic way between 0.+-.E.sub.N, E.sub.N being slightly in excess of the coercive force E.sub.C of said material. Simultaneously, the intensity i of the current traversing the material (2) is measured as a function of the applied field (E) using a unit of visualization, until a stable curve i=f(E) is attained. The invention is particularly suitable for obtaining a stable polarization of ferroelectric polymers, copolymers, crystals, and polycrystals, with the objective of using the piezoelectric and/or pyroelectric properties of these materials.

Abstract: A method and apparatus for regulating the drive of dosaging devices for the controlled feeding of plastic particles, color concentrates and additives into a supply hopper of a screw extruder for producing a mixed plastic product of determined coloration, comprising periodically measuring the coloration of the mixed product at an outlet of the extruder by a spectrometer connected to a measurement probe, comparing the measured coloration of the mixed product with the coloration of the desired product, and adjusting the supply of the plastic product, concentrates and additives, as necessary, so that the measured coloration of the product at the outlet of the extruder is the same as the coloration of the desired product.

Abstract: The thickness of the barrier layer in coextruded multilayer, thermoformable resinous sheet material is controlled by transverse color monitoring during coextrusion of the sheet.

Abstract: A control apparatus for a vulcanizing machine in which vulcanizing is effected by introducing a vulcanizing medium into a rubber made product placed in a molding die and then discharging the same therefrom is disclosed, wherein said control apparatus includes a vulcanizing sequence timer adapted to an output function signal in response to a vulcanizing operation start signal on the basis of vulcanizing data comprising preset vulcanizing steps and functions, said vulcanizing data being read by said vulcanizing sequence timer, and a plurality of control valves for controlling introduction and discharge of a vulcanizing medium in accordance with said function signal outputted from the vulcanizing sequence timer whereby sequential function of the vulcanizing machine is automatically carried out.

Abstract: Apparatus for obtaining a predeterminable distribution of weight per unit area in the transverse direction of a mat formed on a movable support for the manufacture of chip board, fiber board and similar boards is described by means of which fluctuations of the raw material composition and fluctuations of the chip geometry can be compensated for, having regard to the retention of a desired distribution of weight per unit area, by varying the thickness of the pre-mat or mat, or, in the case of a mat which is built up of a plurality of layers, of at least one of the mat layers, at least region by region, by mechanical action over the width of the mat in dependence on a desired distribution of the weight per unit area over the width of the pre-mat, or of the mat or of the mat layer.

Abstract: An apparatus and method for indicating wear or misalignment between a screw and barrel in a plastic material feeder includes forming an aperture in a side wall of the barrel and positioning a proximity detecting probe in the aperture. The probe generates a detection signal having a magnitude proportional to the distance between a selected reference point on the inner wall of the barrel and an outer edge of the flight as it rotates past. The detection signal is stored and displayed as a visual indication of the distance. The stored signal can be selectively reset and two or more probe detection signals can be selectively displayed.

Abstract: A machine and method to operate the machine to provide a plurality of valve-like perforations in the rubber-like backing of a nap mat or carpet by delivering the nap mat or carpet to and under a spiked roll. The machine includes a sensing device to ensure the leading and trailing edges of the nap mat are not perforated by the spiked roll.

Abstract: A liquid level indicating gage comprised of two unitary or integral molded components one, or first component, molded of a clear transparent plastic being a sight window, an arc segment and two leg mounts attached to said sight window, and a mounting hole in each leg mount, and screw mounting holes in the face of the sight window, the other or second component being a unitary or integral molding of foamed plastic, this component consisting of a float section attached to a float arm section and an upper arm section and an indicating segment extending from the upper arm section, and pivot pin axle at the juncture of the upper arm section and float arm section, the second component pivot pin axle mounted in the holes in leg mounts of sight glass, the foamed plastic float section of second component having a specific gravity less than the specific gravity of liquid being measured and the float section to activate the indicating segment located on under side of the sight window.

Abstract: A system in process for producing an improved plastic molded optical element such as a mirror or lens is provided. The molded optical body has at least a surface portion designed for effective interfacing with incident light by reflection or refraction. Discontinuities form reference points at fixed positions on the molded optical surface. The reference points can include a projection or recess formed at the center of the lens system on the optical axis having a sufficient magnitude in size for measurement to determine a spatial position of the optical element but limited in size to prevent any perceptible aberration to be introduced within the desired application of the optical element.

Abstract: The data analysis and display system 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 are generated as a function of stroke length, stored in a non-volatile memory and graphically displayed on the CRT as master traces for comparison with current data profiles.

Abstract: A device for monitoring the filling level of the degassing space in an extruder used for processing thermoplastic materials comprises a level detection orifice located in the degassing dome or jacket of the extruder which opening is connected to a conduit. The conduit leads through a regulator device to a gas source. Connected to the conduit, between the regulator device and the orifice, is a pressure sensor such as a pressure difference switch. If the level of molten material in the dome rises above a preselected level, it blocks the opening and produces a back-pressure in the conduit. The switch is automatically actuated by this back-pressure and produces a signal. Appropriate action can then be taken to prevent the further rise of the molten material in the dome and to prevent blockage of the degassing device.

Abstract: An inlet gas pressure passageway is associated with the movable mold section of a molding press and terminates at and therefore in the plane of the surface of said movable mold section which confronts the surface of the fixed mold section of the press. An outlet gas pressure passageway is associated with the fixed mold section and terminates at and therefore in the plane of the surface of said fixed mold section in alignment with the inlet passageway opening. Air or other gas under a predetermined superatmospheric is applied to the inlet passageway for delivery to the outlet passageway, and the latter is connected to a pressure switch operable at said predetermined gas pressure to effect application of high hydraulic closing pressure to the movable mold section.

Abstract: A non-contact measuring apparatus for determining errors in concentricity between an elongated electrically conductive core such as a wire and an insulation coating thereon is disclosed. An optical scanning section produces an electrical signal proportional to the position of the coating at the same time that a capacitance section produces an electrical signal proportional to the position of the core. A comparator compares the two signals to yield a difference or error signal proportional to the error of concentricity and the result is continuously displayed to show the axis and magnitude of the error.

Abstract: A system for diagnosing fault conditions in an automatic or semiautomatic machines, such as injection molding machines. The diagnostic system comprises a display panel having a plurality of lights or other visual indicators grouped in sets for the respective subsequences of the machine cycle, and if no fault conditions occur and the machine cycles properly, the sets of lights will be energized in succession so that the operator is continuously apprised of the condition of the machine. If a fault condition should occur, one or more of the lights in the set corresponding to the subsequence that the machine is presently implementing will not be energized, and the pattern of energized lights in that set is coded to the particular fault condition that has occurred. By correlating the code with a fault code listing, the operator can quickly identify the location and nature of the malfunction.

Abstract: In accordance with the present invention, there is provided an improved arrangement for and method of electrically testing a cord-set during the molding of the male plug and female receptacle to the opposite ends of the insulated electric cord. In order to accomplish this, the mold for forming the molded plug and receptacle is provided with suitable contacts which upon the closing of the mold automatically establish electrical connections between the terminals of the cord-set and circuits in testing apparatus. These tests consist of checking for continuity in each conductor and for shorts between conductors or terminals and a skin ground test for the purpose of detecting stray strands of wire or any current carrying object that would carry current to the outside surface of the molded plug or receptacle.

Abstract: Disclosed is an apparatus and method for continuously detecting skips, protrusions, protuberances and other defects in cable conductor shield, comprising a high voltage electrode, a capacitance bridge filter circuit and a corona discharge detector. A noncontacting coaxial electrode is employed to create an electric field between the cable conductor and the electrode. In the presence of this field, defects in the shield produce corona discharges. A detection circuit employing a capacitance bridge is employed to continuously detect corona discharges and produce signals used for subsequently locating the positions of the defects on the finished cable.

Abstract: An apparatus is provided for coding articles of manufacture which are produced in a die or mold, such as by molding, casting or other process in which a moldable material is either flow formed or pressure formed to shape. In one form, a plurality of projectible and retractable pins or shafts are movably supported within at least one section of a mold and are selectively advanced or retracted to either partly extend across the mold or die cavity or extend completely thereacross for producing a coded array of cavities or such an array of holes extending completely through a portion of a wall of an object formed in the mold. Projection and retraction of the pins or shafts is effected by respective powered devices, such as fluidic cylinders, motors or electric solenoids. In another form, a plurality of pins or otherwise shaped devices are selectively actuated or disposed by a manipulator operating from outside the mold while the mold is open, against respective portions of the mold cavity wall.

Abstract: Apparatus for measuring injection speeds of a die casting machine comprises a detecting device for detecting injection times at low and high speed injection strokes, calculating elements for calculating low and high injection speeds by dividing the low and high injection strokes by the injection times, and displaying elements for displaying the low and high injection speeds as average injection speeds. The injection time detecting device includes an elongated member having different magnetic characteristics, an element responsive to the characteristics to generate pulse signal, low and high speed injection limit switches, and a discriminating element for discriminating the period of the signal generated by the pulse signal generating element. The injection speeds of the die casting machine can be measured and displayed by the interrelative operations of the elements and devices described above.

Abstract: A process for producing a film of a thermoplastic resin, characterized in that the rotation of a cooling drum for cooling a molten film-like extrudate is controlled such that the variation rate (%) of instantaneous rotation under no load (as defined in the specification) is less than about 1%, and that the cooled film-like extrudate is withdrawn from the cooling drum so that substantially no tension in the subsequent stretching step is exerted on the film-like extrudate on the cooling drum. The process is preferably applicable to a film-forming apparatus which operates at high speeds. A film having markedly reduced thickness unevenness is produced.