Abstract: In a blow-molding system in which a parison programmer is coupled to orifice tooling in an extrusion die head for controlling wall thickness of an extruded parison fed to a blow-molding apparatus, a method of synchronizing operation of the parison programmer contemplates placement of observable indicia on the parison after the parison exits the die head. This indicia placement preferably is carried out under control of the parison programmer to place the indicia at a predetermined position along the parison profile, such that mis-positioning of the indicia indicates absence of phase synchronization of the parison programmer. The indicia is then observed on a molded article to determine phasing of the parison programmer relative to the molding apparatus, and operation of the parison programmer is adjusted to correct any mis-positioning.

Abstract: An electro-mechanical drive apparatus uses a single variable speed motor, two one-way clutches, and a hydraulic accumulator to provide both hydraulic power for the linear motion axes and rotation of the plasticizing screw in an injection molding machine. When engaged, the first one-way clutch couples the drive motor to the pump stack, while the second one-way clutch couples the motor to the feed screw. During rotation of the drive motor in a forward direction; (a) the first one-way clutch engages, rotating the shaft of the hydraulic pump stack to power the machines hydraulic systems and charge the accumulator; and (b) the second one-way clutch slips. When the drive motor is rotated in a reverse direction, (a) the second one-way clutch engages, rotating the feed screw, and (b) the first one-way clutch slips. Preferably, the drive apparatus is associated with a double shaft motor mounted adjacent separate drive couplings for the feed screw and hydraulic pump stack.

Abstract: In a control process speed stages are predetermined for the displacement of a movable unit and a nominal speed curve is derived therefrom. From the nominal speed curve a nominal path/time curve is calculated, from which, in turn, a position reference variable for the speed control is determined. At the time t.sub.i determined for the modification position s.sub.i where the speed level is to be changed for the successive speed stage, the speed of the movable unit is maintained until time t.sub.i' which is the moment at which the movable unit actually reaches the modification position s.sub.i. Upon this occurrence a triggering is initiated which equates the actual time t.sub.i' with the nominal time t.sub.i and which causes the nominal speed course to be superseded by a new nominal speed course progressing from the actual point in time t.sub.i'. The new nominal speed course corresponds to that portion of the superseded nominal speed course which progresses forwardly from the nominal time t.sub.

Abstract: An electric motor type injection apparatus for a vertical molding machine which is compact in size and can be installed on a square measure limited is provided. According to this apparatus, an improper movement due to self-weight of injection mechanism members can be prevented, and deviation of a nozzle tip resulting in the cause of damage of a nozzle tip and a gate can be corrected.

Abstract: A method for continuously producing panels (7) of lignocellulose-containing particles (2). According to the invention, binder is continuously applied to the particles (2) which are continuously shaped to form a mat (4). The mat (4) is continuously precompressed and at the same time continuously preheated by the effect of a high-frequency high-voltage field. The mat (4), which is guided in a plane, is compressed to form the panels (7) under the effect of further heat.

Abstract: A method and apparatus for manufacturing brake friction pads which includes a die having a cavity adapted to receive compressible friction material, a punch adapted to fit within the die cavity, sensing means fir determining the position of the die relative to the punch and means for automatically adjusting the position in response to a) the sensing means, b) operator input and/or c) characteristics of the friction material in the cavity, the desired compressed friction material or both.

Abstract: A method is disclosed for controlling an injection molding machine of the type having an injection screw drivable for axial movement within an extrusion cylinder by a drive-controlled servo motor through a mechanical transmission, to provide a filling phase, a dwell phase, and a plasticization phase, the servo motor having a velocity command signal input connection, and the molding machine having sensors for screw position and injection pressure. The method includes the steps of presetting desired values for at least one of the injection pressure and the screw position; sensing the respective one of the corresponding actual injection pressure and actual screw position; and transmitting non-zero velocity command signals to the drive-controlled servo motor during at least the plasticization phase, and preferably also the filling and dwell phases, to move the injection screw within the cylinder.

Abstract: Expanded or foamed plastic material is fed into a hopper containing a first auger having a cutting function. The first auger is driven by an electric motor and cuts the plastic material into pieces which are discharged from the hopper into a vertical chamber. The vertical chamber contains a second auger driven by an electric motor. The pieces of plastic material are compressed by the second auger and delivered into a chamber which serves as the inlet end of a horizontal friction chute. The plastic material in the chamber is compressed by a hydraulic ram which forces the compressed plastic material along the friction chute.

Abstract: A method for injecting a plastic material into a mold cavity to precisely fill the mold cavity under low pressure and to avoid packing the mold cavity with plastic material. The plastic material is injected into the mold cavity at a rate sufficient to maintain an unbroken melt front and to avoid any spraying or splashing of the plastic material within the mold cavity. After an initial unbroken melt front is established, the rate at which the material is injected is increased in proportion to the size of the melt front. After a predetermined amount of the material has entered the mold cavity, the material is injected based upon a rate-dominated control algorithm which maintains the unbroken melt front.

Abstract: A molding condition optimizing system for an injection molding machine comprising plastic flow condition optimizing section and an operating condition determining section is disclosed. The plastic flow condition optimizing section carries out a plastic flow analysis on a molded part model, and determines an optimum flow condition in a filling stage and a packing stage of an injection molding process of the injection molding machine by repeatedly executing an automated calculation using the result of the plastic flow analysis and the plastic flow analysis itself.

Abstract: The present invention generally relates to manufacturing apparatus, method of manufacture, and products manufactured thereby and more particularly to an integral three-dimensional object (6, 15) formed from individually contoured laminations (4, 62) of the same or gradually varying shape, successive laminae of that object being produced out of thin sheet or powder based materials (1, 60) through the cutting, fusing or physicochemical property changing action generated by a computer directed beam (7) of concentrated energy or matter, successive substantially planar laminations (4, 62) of that object (6, 15) being automatically stacked together for step-wise laminar buildup of the desired object (6, 15).

Abstract: The separation of a lower mold from an upper mold in an injection molding machine is either temporarily paused or carried out at a lower speed so as to maintain deformation of a thin component within a permissible range, while a jet of air is applied to help remove the thin component from the upper mold. Also, the ejecting operation of the thin component is either temporarily paused or carried out at a lower speed before the deformation of the thin component exceeds the permissible limit while a jet of air is applied to help remove the thin component from the lower mold.

Abstract: A method and system of controlling a screw engaging position adjuster provided in a complex mold clamping system. A theoretical deviation of a screw engaging position is theoretically calculated on the basis of a distance by which a movable die has been moved from an origin set for a mold thickness adjustment in clamping process. A measured deviation of the screw engaging position is measured from a distance between a mold clamping cylinder and a movable platen in clamping process. The screw engaging position adjuster is so controlled that a difference between the theoretical deviation and the measuring deviation is within an allowable deviation having previously been set.

Abstract: A control method for an injection molding machine includes deciding a position where the speed of a movable platen is to be changed from high speed to low speed. Over the coasting distance, between high speed (equivalent to V.sub.4) and low speed (equivalent to V.sub.6), the speed changes smoothly past the decided position in accordance with a function of time, F(T)=V.sub.4 -(V.sub.4 -V.sub.6) (1-e.sup.-T). Decreasing speed at a second decided position, just before the movable platen stops, is in accordance with a function of position s, F(s)=s(V.sub.MAX -V.sub.MIN)/D+V.sub.MIN. V.sub.MAX is equivalent to the maximum mold closing or opening speed and V.sub.MIN is equivalent to the minimum speed at which moving of the movable platen is guaranteed.

Abstract: Controlling device and method for an extruder which can continuously process materials of different kinds without burning a following material and without causing variation in physical properties by allowing the following material to succeed to a preceding material without running out of sheet when the materials are replaced. In an extruder in which a roller die 2 having upper and lower parallel rollers 9 is arranged in front of an outlet of an extruder body 1 rotatably including screws 3 for extruding material and a bank portion 12 surrounded by the upper and lower rollers 9 and a side guide 20 closing both of right and left sides of the outlet 7 is formed, the roller die 2 is once stopped when the quantity of the bank portion 12 reaches the bank quantity which is the minimum for the preceding material to be extruded to be succeeded by the following different material to be extruded.

Abstract: A method of manufacturing a panel having a foam interlayer. A flexible cover is placed adjacent a first mold in an open tool. A rigid substrate is placed adjacent a second mold, or alternately, is place atop the flexible cover in the first mold, of the opened tool. The first and/or second molds are electrically isolated from one another and from the associated manufacturing equipment. A vacuum draws the cover against the first mold and retains the cover in position during the manufacturing operation. The tool is moved to a closed position and the cover is positioned juxtaposed the substrate. The cover and substrate are positioned a distance apart thus creating a space therebetween. A vacuum is created in the space and a radio frequency (RF) electric field is applied between the first and second molds. The RF electric field causes a plasma to be created within the space. The plasma activates both the cover and the substrate. While the space is still under vacuum, a foaming material is injected into the space.

Abstract: A method for injecting a plastic material into a mold cavity to precisely fill the mold cavity under low pressure and to avoid packing the mold cavity with plastic material. The plastic material is injected into the mold cavity at a rate sufficient to maintain an unbroken melt front and to avoid any spraying or splashing of the plastic material within the mold cavity. After an initial unbroken melt front is established, the rate at which the material is injected is increased in proportion to the size of the melt front. After a predetermined amount of the material has entered the mold cavity, the material is injected based upon a rate-dominated control algorithm which maintains the unbroken melt front. Once the mold cavity has reached a pre-determined level of fill, the rate-dominated control algorithm is changed to a pressure-dominated control algorithm to prevent overrunning the end point of the mold process and to eliminate splashing and associated backflow problems.

Abstract: A disc base molding method and apparatus are provided for the injection molding of disc bases so as to produce thin disc bases having increased signal transfer clarity with a shortened molding cycle. Upon closure of a mold, a signal is sent to a mold clamping start delay timer and an injection start delay timer. Pressure is increased for mold clamping at approximately the same time that molten resin is introduced into the mold cavity. The time period from the start of pressure increase when the molten resin is initially introduced to the mold cavity until a specific mold clamping force is reached, is controllable. Upon completion of the injection of the molten resin, the mold clamping force is maintained until the molten resin is solidified.

Abstract: A transducer for measuring the amount of lateral deflection taking place at the tip of a core-pin inside a mold or die cavity. Non-uniform cavity pressure and cooling patterns make core-pins prone to deflection resulting in out-of-tolerance thin and thick wall sections of the finished part. The transducer provides a means of determining deflection as it occurs during the molding process for statistical quality control. Real time measurement of the core deflection allows discrimination of unacceptable and reject parts for an automatic part sorting process. In the preferred embodiment a plurality of strain gauges mounted on the core-pin outside of the mold cavity provide real time electric signals of lateral deflection that can be used to automatically segregate reject parts and provide for statistical process control.

Abstract: A method of easily consecutively manufacturing a layered structure with the same or different kinds of materials superposed in a plurality of layers, is attained by a simple mechanical method. The layered structure manufacturing method is embodied by use of a shaping apparatus having a unique construction. The shaping apparatus includes a plurality of irregular passageways disposed in a side-by-side relationship in the same direction, wherein sectional configurations of the irregular passageways continuously vary from inlets thereof toward outlets, and the irregular passageways are superposed on each other at the outlets. An apparatus body as a principal portion of the shaping apparatus may be constructed by connecting a plurality of elements in series, which are internally formed with the irregular passageways. Materials to be shaped, which exhibit a fluidity or plasticity, are fed into the inlets of the irregular passageways in the shaping apparatus.

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

Abstract: A method for injection-molding workpieces in a mold of an injection-molding machine is disclosed. The method provides a means of conducting test cycles during the initial setup of the machine at reduced speed. In a multi-cavity mold all of the workpieces are demolded by means of a handling system having a workpiece carrier system receiving and holding all workpieces in a regular pattern. The workpieces are inspected on the workpiece carrier system for determining whether all of the cavities have been filled with plastic material and whether the workpieces are of a predetermined quality. If this is not the case, the necessary adjustments are made and the test cycle is repeated. If all of the workpieces are of a predetermined quality, the machine is switched to automatic production at high nominal speed.

Abstract: Compression forces (F) in a rotary tablet compressing machine (40) are monitored and controlled to provide enhanced accuracy in determining peak compression value and continuous validation of a compression waveform. The compression waveform is repetitively sampled under computer control at a sampling frequency that is many times the frequency of the compression events. The samples are stored in a computer memory (26) until at least one complete compression event is recorded. Identification of beginning and ending samples of an individual tablet compression event are obtained from the waveform itself by locating minimum amplitude samples, or by use of a separate signal that is derived from a transducer which is responsive to the angular position of a rotating turret. Stored samples representing the compression waveform as time and amplitude data are passed to a processor (23) that statistically fits the data to an equation form which represents the ideal shape of a compression event.

Abstract: The present invention presents a fluid flow process analyzing apparatus and method, an injection molding process analyzing apparatus and method, an injection molded product and an injection molded product producing method, in which a three-dimensional model divided into a plurality of small elements to present a cavity where fluid flows is used for analyzing a process of fluid flow such as injection molding process in a practical computing time. The fluid flow process analyzing apparatus and method of the present invention comprises; constructing a three-dimensional model divided into a plurality of small elements to represent a cavity where fluid flows, determining the flow conductance .kappa. as a small value when the small element concerned is located close to the cavity wall surface and as a large value when the small element is located far away, and computing the pressures, pressure transitions or flow velocities at the respective small elements based on the flow conductances determined.

Abstract: A system and method for fabricating a thermoplastic prosthetic limb socket from a thermoplastic preform cone involves the steps of: obtaining a digital or physical positive representation of a patient's residual limb; determining a desired thickness for the thermoplastic socket; selecting a thermoplastic preform cone; calculating the dimensions of a proximate extension to be added to the proximate end of the digital or physical representation of the patient's residual limb based upon the dimensions of the patient's residual limb, the dimensions of the preform cone, and the desired thickness of the thermoplastic socket; forming a positive socket mold based upon the combined dimensions of the patient's residual limb and the extension; heating the preform cone; and stretching the preform cone over the positive cast. Preferably the method is performed on a CAD tool.

Abstract: In a mold closing unit for use in an injection molding machine for processing plastifiable materials comprising a first device for transfering a movable mold carrier and a second device for generating the closing force, the first device is supported at a first supporting element. The second device acts on the first device, the first supporting element and the movable mold carrier. As second device for generating the closing force an eccentric drive or a hydraulic drive unit is provided enabling a process for force control.

Abstract: Over the whole range of the injection process, standard injection speeds and pressures are set and sections for injection speed control and sections for pressure control are set according to the length of time t, screw position S, or injection pressure P, each after the start of injection, or following the combination of the length of time and the screw position or of the length of time and the injection pressure. The arrival at the point of changeover from one control section to another is followed by a control mode shift. If the shift is made for speed control, injection speed is controlled in a manner such that actual injection speed may agree with one standard injection pressure, while if pressure control is selected by the shift, there is provided feedback control which is put into practice so that actual injection pressure may coincide with one standard injection pressure.

Abstract: A method and apparatus is provided for controlling the reconfiguration of a moulded boat hull structure as it is cooled from its moulding temperature to ambient temperature. A dynamic cooling fixture is utilized having movable panels that support substantially the entire inner and outer hull surfaces during the entire cooling process. This results in the cooling of the hull in a manner which will be devoid of wrinkles, depressions, or other disadvantageous discontinuities.

Abstract: A method of operation for an injection molding machine is disclosed. The injection molding machine includes an injector having an advancable screw and a barrel cylinder, and a mold clamp for holding a mold with a controllable pressure and for allowing the mold to open a controllable amount. In performing the method, preset values are established for a stop position of the advancable screw, a clamping pressure of the mold clamp, and an opening amount for the mold. The screw is advanced up to the preset stop position and stopped thereat. The screw is controlled so as to ensure the location of the screw at the preset stop position for a preset time. Resin is injected from the barrel cylinder into the mold. The mold is clamped with the preset clamping pressure, during the preset time, by operating the mold clamp while maintaining the positioning of the screw at the preset stop position.

Abstract: A molded plastic garment hanger constituted from two materials which are fused and mechanically bonded to form a composite hanger. Also disclosed is a method and apparatus for the two-step or co-injection molding of plastic materials for the formation of the plastic garment hanger construction. The plastic garment hanger incorporates an insert consisting of a second plastic material adapted to have indicia, logo or non-slip means molded therein, and which insert may be fused to the hanger structure so as to form a mechanical bond with the first plastic material constituting the basic garment hanger.

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

Abstract: A method and apparatus for mold protection of motor-driven clamping unit is provided. The method and apparatus is based on high response characteristics of the motor and a new control method. A continuously variable restrictive motor output scheme is used in conjunction with the mechanics characteristics of the toggle mechanism to maintain a substantially constant mold protective force at all positions. Further, the mold protective force can be adaptively adjusted with respect to different types of molds and motional conditions so that the mold can be adequately protected whenever abnormal condition occurs during mold closing action. The motor output will thus not unduly increased to a great level that would damage the mold, the machine, or even the operators. The drawbacks of the prior art are thus eliminated.

Abstract: A method and apparatus are provided for producing insert molded articles. The involves the steps of preforming a patterned insert material clamped at end parts thereof by a clamping device into a predetermined shape corresponding to the shape of a cavity formation face of a male die or a female die of an injection molding die by a preforming device, and trimming an unnecessary portion of the preformed material by a trimming device so as not to project from the peripheral edge of the surface of a cubic molded article to be formed of molding resin. The method further involves setting the trimmed material at the cavity formation face of the male or female die of the injection molding die, clamping the male and female dies to form a cavity by the cavity formation faces, injecting molding resin into the cavity, and removing the insert molded article from the injection molding die after the molding resin is cooled and softened.

Abstract: Molten resin, plasticized in the plasticization chamber, is fed to the injection chamber through a connection passage where it is measured. Before it is injected by the plunger, the connection passage is blocked and the molten resin is preliminarily compressed. This invention provides a method using a preplasticization type injection molding machine that controls the volume of the filled molten resin with little variation utilizing blocking and preliminary compression. By means of blocking or preliminary compression, the position movement by which the plunger moves from the position at which the measurement is completed is calculated, and the position at which the next measurement will be complete is corrected. Furthermore, the molten resin fill operation is done on the basis of the position of the plunger detected at the time of the preliminary compression.

Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltorsim.B/A.ltorsim.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.

Abstract: A plasticization control method for an injection molding machine in which the plasticized state of resin in an injection cylinder is controlled in measuring based on the detected rotating force of a screw. A reference screw rotating force C or F required for desired measuring operation is determined. Using the reference screw rotating force C or F as a reference, upper and lower limits D and E of an allowable screw rotating force range, in which measuring can be performed normally, are set for each of screw positions, and then stored as an allowable value file. The rotating force V acting on the screw during measuring operation is successively detected. If the rotating force V is not between the upper and lower limits D and E of the allowable range relating to the current position of the screw, it is judged that plasticization is abnormal and an abnormality alarm is outputted.

Abstract: A position detecting system for an injection molding apparatus can detect the position of a plurality of movable portions of the injection molding apparatus. The position detecting system includes a single position detector capable of detecting respective positions of a plurality of objective portions arranged movably along a single scale portion. Each of the plurality of movable portions of the injection molding apparatus is coupled with one of the objective portions of the position detecting system and moves together with the respective objective portion.

Abstract: Method and apparatus for lens thickness adjustment in injection molding of thermoplastic vision-corrective spectacle lenses without manual addition or removal of shims, of inserts or of any other mold part. Thickness adjustment can be made quickly between molding cycles with a simple manual setting and locking step while the lens mold is kept at very hot operating temperatures, yet with minimal risk of burning the operator. A rotatable adjustment head is mounted externally onto the mold's operator side, and manually-driven rotation turns a threaded screw which engages a mechanical assembly which produces an axially perpendicular motion which in turn drives forward or back the settable position of an optically polished insert within the lens mold's cavity. Preferably, this manually-driven rotation turns a worm gear mechanism which rotates a threaded male shaft within a mated threaded female bore axially perpendicular to the parting line.

Abstract: A pelleting press for pressing from a powdery, granular and/or pasty material compacted rod-shaped pieces of said material, comprising a die (1) with one or more rotatable rolls (6) co-operating therewith each having an axis (5) supported in such a manner that it is situated in a plane through the axis (3) of the die (1) and a gap (9) is defined between the die (1) and the or each roll (6), further comprising means for supplying the material to be pressed towards the or each gap (9), and driving means for moving the die (1) and the or each roll (6) in respect of the material supplied to the or each gap (9), all this in such a manner that the supplied material when moving in the gap between the die and a roll is compacted and is pressed through the apertures (2), the support of the die and/or the or each roll being so that the gap height is adjustable, the driving means being adapted for driving the die as well as the or each roll, and the velocity of at least the die or the each roll being independently varia

Abstract: An electric mold clamping mechanism containing a pair of clamping members is activated by an electric motor. The electric motor operates a threaded piston with acme threads which in turn operate a drive plate to extend and retract the clamping members. The clamping members are used to hold a mold plate in an injection molding machine. The clamping members are pivotally attached to a drive plate mechanism and have a surface which mates with a wedge cam to force the clamping member against the mold plate. The stroke of the clamping mechanism is regulated by an amperage draw on the electric motor. A limit switch is used to terminate the end of the retracting stroke. An indicator light is used to indicate the clamping position of the device.

Abstract: A method for manufacturing biaxially oriented tubing from a thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel is an expansion part which produces expansion in the circumferential direction of the tube. Downstream of the mandrel an axial pulling force is exerted on the tube, and the biaxially oriented tube is cooled down. At a distance downstream of the mandrel, the tube is drawn through a calibration opening bounded by a calibration device, the calibration opening being such that it produces a reduction in the external dimensions of the tube. Accurate regulation of the external dimensions of the tube is provided by regulating the distance between the mandrel and the calibration device, in particular depending on the external dimensions of the tube measured downstream of the calibration device.

Abstract: A rod 3 is driven forward to open an annular slit 5 between a die 2 and a mandrel 4 and the molten resin in a resin accumulation chamber 10 is expelled from annular slit 5 to form a parison. In this operation, the die 2 is displaced from an original position adjoining to the mandrel 4 (axially aligned position) upon opening of the annular slit 5 to correct for any variation in thickness of parison P to be extruded from the annular slit 5. Then, the molten resin accumulated in accumulation chamber 10 is expelled from annular slit 5 to form parison P. The die 2 is then reset to the original position to bring the die 2 and mandrel 4 into axial alignment. Therefore, as the rod 3 is driven back, the annular slit 5 can be closed tight by the mandrel 4 to prevent resin leakage. After closure of the annular slit 5, molten resin is accumulated again in the accumulation chamber 10 and the annular slit 5 is opened. This procedure is repeated to produce parisons on an intermittent basis.

Abstract: A method and apparatus for quickly and inexpensively providing a constant extrusion pressure for pipeline lining with a mortar. A mandrel is inserted in a pipeline section with a slug of mortar ahead thereof. A pushing force is applied thereto to overcome resistance to movement thereof. A constant tension pull is applied to the mandrel to effect relatively constant but effective extrusion pressure between the mandrel and the pipeline wall for extrusion of mortar on the inner wall of the pipeline section.

Abstract: A mold clamping control method capable of preventing any warp or strain on a molded product without stopping an injection pressure holding process so as to cancel the pressing force of an injection screw. In a series of injection and pressure holding processes, a movable platen is retracted from a mold clamping dwell position P2 to a mold opening dwell position P1, so that a substantial volume of a cavity of a mold is increased to temporarily lower the internal pressure of the cavity, thus making an internal stress of resin to be a product uniform to eliminate stress strains. In this method, an injection molding is performed to produce a precise product having no warp or strain even in molding a light guide plate which is subjected to molding abnormalities by the temporary stoppage of the injection pressure holding process according to the conventional method.

Abstract: A thermally expandable wax composition and its use in polymer-based actuators is disclosed and claimed. The compositions are wax-based and include conductive filler as well as a viscosity modifier to stabilize the composition against segregation. Optionally included are thermoxidative stabilizers.

Abstract: An apparatus and method for controlling mass flow in an extrusion die provides cross-directional measurements of at least one property of an extrusion produced by the extrusion die, such measurements being made at a plurality of cross-directional locations that successively span the extrusion. The measurements are assembled to provide cross-directional profiles of the extrusion. A spatial-frequency splitter operates upon the cross directional profiles to separate selected spatial frequency component profiles from each cross-directional profile. A reference profile is provided for representing desired spatial frequency profiles. An error signal generator generates error signals representing the difference between the spatial frequency component profiles and the desired spatial frequency profiles and actuators control mass flow components of the extrusion die in response to the error signals.

Abstract: A method and apparatus for compression molding plastic articles including closures which includes providing coacting sets of tools including a first set for moving a core and core sleeve into engagement with a cavity mold on a second set of tooling. An actuator is provided between the first set of tooling and a fixed upper cam. The second set of tooling includes an associated actuator supporting the cavity mold and associated with a lower fixed cam. A nitrogen cylinder in the second set of tooling provides for control of the compression molding force. In a preferred form, a plurality of sets of tooling are provided in circumferentially spaced relation on a rotating turret supported by a central column. A common manifold supplies the pressure at accurately controlled pressure to each of the nitrogen cylinders. A control system is provided for monitoring and changing the pressure.

Abstract: An injection molding method and apparatus in which an injection molding metal mold having a valve gate 7 mechanically opening and closing a gate facing an injection molding cavity is used, and the timing of closing the valve gate is set with reference to a melted resin pressure in the injection molding cavity during a holding pressure step in a molding process. The molding method and apparatus result in high accuracy molded products by utilizing a valve gate system in the injection molding of thin products, and also result in molded products having less variations among cavities even in the case where a plurality of products are molded at the same time.

Abstract: An injection pressure is detected as a pressure detection value Dp during injection and filling, and the thus obtained pressure detection value Dp is multiplied by a preset predetermined coefficient so as to be converted into a desired mold clamping force Fc with which the mold clamping force is controlled. The desired mold clamping force Fc is set to a minimum value which a mold does not open, that is, the desired mold clamping force Fc is calculated with the use of Fc=(.alpha.*S*.beta.)Dp, where .alpha. is a charging rate of resin in a mold cavity, S is an entire projected area of a molding article, .beta. is a safety factor, and Dp is a pressure detection value Dp. With this arrangement, in a section where the injection pressure gradually increases from zero during injection and filling, the profile (variation curve) of mold clamping force gradually increases as the injection pressure varies.

Abstract: A system and process for controlling mold activity of a molding machine is disclosed and includes a clamping device for positioning a movable mold platen on a carrier device and relative another platen, for forcefully engaging the movable mold platen with the another platen and on the carrier device, for sustaining forceful engagement of the movable mold platen with the another platen and the carrier device, and for breaking the movable platen from the another platen and the carrying device. The movable mold platen includes a movable mold half and the another platen includes another mold half. The system also includes a manner for determining an adjustable starting position of the clamping device and movable mold platen. A manner for adjusting the adjustable starting position for achieving greater accuracy of the adjustable starting position for the clamping device and the movable platen is provided. The manner for adjusting includes a mechanism for actuating the clamping device.