Abstract: A method for manufacturing an implant for implantation into a human body, includes preparing a mold having an inner space part so as to have an inner shape corresponding to a defective portion in a human body; injecting silicone foam into the space part of the mold; curing the silicone foam while applying pressure to same; and removing the mold.

Abstract: A device for producing a pultruded article is provided with: a mold in which an intermediate molded article comprising reinforcing fibers impregnated with a thermosetting resin is heated and hardened; and a pultrusion device that causes a pultruded article generated by heating and hardening the intermediate molded article in the mold to be pultruded from the mold. The mold comprises a pressing member that is elastically deformable and that presses the intermediate molded article.

Abstract: The injection moulding of articles formed by plastic materials having different characteristics, for example of different colours, is carried out in a single injection cycle in which the first and the second plastic materials are injected into a first and into a second zone of a mould cavity by first and second injectors controlled according to specific modes so as to define a shape and/or a position of a weld line.

Abstract: A control device for an injection molding machine has a first operation condition setup unit for setting an operation condition for a setting operation, a conversion table for storing in pairs an operation condition for the setting operation and an operation condition for a pull operation, a second operation condition setup unit for setting, by reference to the conversion table, an operation condition for the pull operation in correspondence to the operation condition for the setting operation set by the first operation condition setup unit, and a driving command generation unit for generating driving commands which drive the injection molding machine to perform the setting operation and the pull operation in accordance with the operation conditions set by the first operation condition setup unit and the second operation condition setup unit.

Abstract: An apparatus for taking out a molded product, includes: a transverse frame disposed above a resin injection molding machine to extend in a transverse direction, which is orthogonal to a longitudinal direction; an orthogonal frame supported by the transverse frame so as to be movable at least in the transverse direction; a vertical arm provided at the orthogonal frame so as to be movable up and down at least in the vertical direction; and a holding member provided at a distal end portion of the vertical arm to hold a resin molded product formed by the resin injection molding machine. The vertical arm is disposed so as to be inclined such that the axis line of an elevating shaft of the vertical arm forms an acute angle with respect to a perpendicular extending in the vertical direction.

Abstract: Provided herein is an apparatus for taking out a molded product that can inform a user of the air consumption and the electric power consumption matching the set conditions without using measuring devices and that allows the user to set conditions that reduces the total energy consumption. A consumption computing section computes an air consumption and an electric power consumption per one molding cycle based on conditions set for a plurality of air driven devices and conditions set for a plurality of electric devices input from a controller and individual air consumption information and individual electric power consumption information stored in a consumption information storage section. A display control section causes a display section to display the air consumption and the electric power consumption computed by the consumption computing section.

Abstract: According to one embodiment, the pattern formation apparatus relating to the embodiment is a pattern formation apparatus wherein an object to be patterned (pattern transferring material) is irradiated with light under the state of affixing a three dimensional pattern formed on the main plane of a template to the object to transfer a reverse image of the three dimension pattern into the pattern transferring material the pattern transferring material. The pattern formation apparatus provides a light irradiation part and a control part. The light irradiation part is configured to irradiate light having intensity distribution in the irradiation plane parallel to the main plane. The control part is configured to control the light irradiation part to change the intensity distribution according to time.

Abstract: A method for removing foreign matters attaching on a surface of a fine pattern of a mold, having the fine pattern being convexo-concave, at least on one surface thereof, thereby cleaning the fine pattern surface of the mold, and an imprinting device applying that method therein, without removing, comprises the following steps of: applying a photo-curable resin on a surface of a body to be transcribed, onto which the mold is suppressed, and thereby forming a photo-curable resin layer; suppressing the mold on the photo-curable resin, which is applied on the surface of the body to be transcribed; separating the photo-curable resin cured from the mold, after curing the photo-curable resin, and whereby taking the foreign matters attaching on the surface of the fine pattern into the photo-curable resin cured to remove them, wherein the photo-curable resin to be formed on the surface of the body to be transcribed is formed with such thickness that it can remove the foreign matters attaching on the fine pattern, and

Abstract: A light curing device (10) for dental purposes which is provided with a housing (12), at least one control element for controlling the operation of the light curing device and an actuating member (26) which is mounted moveably relative to the housing for the actuation of the control element. The light curing device is provided with at least two control elements (44, 46) spaced apart from each other which are electrically connected in parallel. Furthermore, at least one of the control elements (44, 46) can be actuated by actuation of the actuating member (26).

Abstract: An apparatus for intermittently manufacturing a raw rubber strip comprises a screw extruder, an extruder head having a preforming nozzle, a gear pump therebetween, a pair of calender rolls, a roll-gap changer for switching between a close state and an open state of calender rolls, and a controller for controlling the gear pump, the calender rolls and the roll-gap changer to let the calender rolls in the open state prior to the stopping of the rotation of the calender rolls.

Abstract: Branched end reactants having two or three functional groups at the ends are disclosed. The branched end reactants are used to prepare crosslinked hydrogel tissue adhesives, which have a good balance of mechanical properties in an aqueous environment. Kits comprising the branched end reactants and methods for applying a coating to an anatomical site on tissue of a living organism are also disclosed.

Abstract: The imprint apparatus of the present invention molds an imprint material on a substrate using a mold and cures the imprint material to form a pattern on the substrate. The apparatus includes a holder configured to attract the mold to hold the mold; and a pressure reduction device configured to reduce a back pressure of the mold held by the holder, wherein the apparatus is configured to reduce the back pressure by the pressure reduction device in parallel with release of the mold from the imprint material.

Abstract: This invention provides single-step pultrusion processes for producing fiber reinforced polymer (FRP) articles that may have variable cross sections and/or non-linear shapes. This unique capability results from the use of two sets of dies to form the article. The first is a set of moving dies connected together to form mating continuous loops of moving die links to: a) draw the FRP material into the apparatus; b) shape the cross section of the FRP material; c) cut the FRP material to the appropriate length; and d) hold the uncut FRP material in position for the next production cycle. The second set of dies forms a guide path mounted on opposing conveyers. The guide path includes heated die segments to define a curing section that may be non-linear. Cycling the moving die links through the curing section and/or cycling the conveyers provides a straightforward method for automated production of finished pultruded articles with unique shapes.

Abstract: A device (4) for transferring a pattern to an object (2). The invention relates especially to production of micro and nanostructures. The device comprises an alignment means (10) arranged in connection with a first contacting means (7) for controlling the motion of the first stamp (8) in a direction perpendicular to the pressing direction (A), and a second contacting means (11) having a second stamp (12) adapted to imprint a second pattern in the second surface (6) of the object (2), and a pressing means (9) further adapted to press the second stamp (12) into contact with the second surface (6) of the object (2) in the pressing direction (A). Hereby is obtained a device of a simple design, which has a high accuracy of the alignment of the stamps in relation to the object.

Abstract: This invention provides single-step pultrusion processes for producing fiber reinforced polymer (FRP) articles that may have variable cross sections and/or non-linear shapes. This unique capability results from the use of two sets of dies to form the article. The first is a set of moving dies connected together to form mating continuous loops of moving die links to: a) draw the FRP material into the apparatus; b) shape the cross section of the FRP material; c) cut the FRP material to the appropriate length; and d) hold the uncut FRP material in position for the next production cycle. The second set of dies forms a guide path mounted on opposing conveyers. The guide path includes heated die segments to define a curing section that may be non-linear. Cycling the moving die links through the curing section and/or cycling the conveyers provides a straightforward method for automated production of finished pultruded articles with unique shapes.

Abstract: There is provided a method and an apparatus for manufacturing a semiconductor device having a lidless and highly reliable flip-chip structure. The method for manufacturing a semiconductor device wherein an underfill resin is filled in a space between a substrate and a semiconductor chip includes injecting a first underfill resin in said space under a first injecting condition; specifying a location where the fillet height of the underfill resin formed on the side of said semiconductor chip does not meet a prescribed standard; and injecting a second underfill resin in a location where the fillet height does not meet the prescribed standard under a second injecting condition. Since the fillet heights can uniformly meet the prescribed standard, the concentration of stress can be avoided, and a semiconductor device having a lidless and highly reliable flip-chip structure can be manufactured.

Abstract: A “mold opening completion position,” a “halfway position,” and a “mold closing completion position” are set on a core operation setting screen associated with mold opening and closing operation. On the other hand, core insertion operation is divided into a plurality of elements (operation elements) including “core insertion output start,” “core insertion check,” and “core insertion output end.” Likewise, core removal operation is divided into a plurality of elements (operation elements) including “core removal output start,” “core removable check,” and “core removable output end.” One or more set items constituted by combination of the system of a core and the operation elements of the core are set with respect to each position.

Abstract: An apparatus and associated method for varying the color and/or flavor of an extruded food product during a single production run of a single extrusion device. The apparatus includes a multi-additive injection system, which is attached to a fluid supply line of an extrusion device. The injection system is comprised of a plurality of additive supply tanks, which are each in fluid communication with the fluid supply line via an injection manifold, and a metering mechanism which selectively controls the amount of additive injected into the supply line by each individual supply tank. The injection system may also include a central control mechanism for calibrating the amount of additive injected into the supply line and for maintaining a constant fluid volume added to the extrusion device. Each of the additive supply tanks may contain a different colorant and/or flavoring. Two variants of the injection manifold are provided as well as a novel injection sequence for use with the disclosed system.

Abstract: A high volume lens curing system is described. The high volume lens curing system may be configured to cure multiple eyeglass lenses in a continuous manner. An embodiment of the lens curing system includes an apparatus for preparing an eyeglass lens. The apparatus may include one or more lens curing units and a mold assembly. At least one lens curing unit may include a heating system. The apparatus may include a computer system. The computer may be configured to turn on components of one or more lens curing units. In some embodiments, the apparatus may include a conveyor system configured to convey the mold assembly to, through or from the apparatus. In some embodiments, the apparatus may include an annealing unit, an air distributor and/or filters.

Abstract: The invention relates to a control method for controlling the back pressure in an injection molding machine which includes a first motor that axially displaces a screw and a second motor that turns the screw, whereby both motors act upon a common shaft. In order to control the back pressure, a speed value for controlling the second motor is furnished as a rotational speed input value to a control circuit for controlling the speed or rotation speed of the first motor. The back pressure is thus controlled in dependence on a pressure differential via the difference in rotation speeds of both motors.

Abstract: A high volume lens curing system is described. The high volume lens curing system may be configured to cure multiple eyeglass lenses in a continuous manner. An embodiment of a system may include a lens curing apparatus, a mold assembly and a controller. In some embodiments, the apparatus may include a conveyor system configured to convey the mold assembly through the lens curing units. The controller may include controller software operable to receive an eyeglass prescription, identify the first and second mold members that will produce an eyeglass lens having the eyeglass prescription and/or determine curing conditions.

Abstract: An efficient and cost-effective method of designing and manufacturing a molded container having highly artistic sculptural relief. Computer software is utilized to design a skin shape, create artwork designs, add relief to the artwork designs, and apply the artwork designs to the container skin to develop a desired container. For example, design data is utilized to make molds, such as blow molds, which, in turn are utilized to make containers.

Abstract: An extrusion system controller monitors the movement of an extrudate using a motion detector. Upon detection that the extrudate is no longer moving along its path of movement at the appropriate speed, the controller causes power interruption to the extrusion system by a controlled power switching device. A dimensional anomaly detected by a gauge can cause the controller to effect power interruption as well, when the anomaly lies outside a range of correctable dimensions or when the anomaly does not respond to corrective action by the controller. In the event that a cutter is used on the extrusion line, a detector that may be a photodetector senses that the extrudate is being severed regularly. In the absence of regular severance of the extrudate, the controller effects a power interruption. By use of these techniques, the extrusion line can run entirely unattended.

Abstract: The invention relates to a device for the injection moulding of materials. Said device comprises an injection moulding machine (40) and at least one mould (20, 21) which can be actively connected thereto. The injection moulding machine comprises a standardised interface element (1) which can be actively connected to a corresponding interface element (1) pertaining to more than one mould (20, 21). Means such as substances, energy, and information are exchanged with the at least one mould (20, 21) via the interface part (1).

Abstract: A method of this invention is an injection compression molding method of molding a thin molding, using an injection compression molding machine including: a pair of a movable mold and a stationary mold defining a molding space; a movable die plate on which the movable mold is mounted; a stationary die plate on which the stationary mold is mounted; an injection unit for injecting a molding material into the molding space; and a mold clamping unit for causing the movable die plate to move toward and away from the stationary die plate, capable of controlling a clamping pressure for pressing the movable die plate toward the stationary die plate while the injection unit is injecting the molding material into the molding space. This method includes a nonloaded flow step of controlling the mold clamping unit in such a manner that any resistance is not exerted substantially against flow of the molding material injected into the molding space by the injection unit, during the injecting step.

Abstract: Injection molding method and apparatus for repeatedly performing an injection molding cycle including the steps of closing and clamping a mold having a mold cavity, injecting a resin material into the mold cavity, cooling and solidifying the resin material filling the mold cavity, and opening the mold so as to remove a molded product, in order to successively form the molded product, wherein a cycle time is measured at a measuring point in the injection molding cycle, and a difference between the measurement of the cycle time and a predetermined reference cycle time is obtained, and then a time compensation on the basis of the difference is executed at a time-controlled step which is arranged to be executed before the next measuring point comes.

Abstract: A method for operating actuators, such as pneumatic valves, in an injection molding machine especially for CD or DVD discs, or other molded articles. The timing of auxiliary processes (such as blowing air into the mold cavity or applying suction to the molded article in the cavity) is set as a function of the instant of completion of a process in the main sequence of operations (especially, cooling the molded article prior to ejection from the mold). In a set and display section the user sets a preferred time tn for each actuator to operate after, or before, a set completion time T of the main-sequence process (e.g., cooling). The time tn can be negative or positive, so that the various actuators turn on before or after the set completion time. A CPU calculates a starting time T±tn, and keeps the actuators on during a following interval tp. The starting time T±tn may be input to a memory, and output to the respective actuator.

Abstract: A resin extrusion apparatus having a weighing device (11) connected to a controller (18). A powder container (12) for supplying a powder (Y) to a resin extruder (20), a screw (13), and a motor (14) are installed over the weighing device 11. The motor (14) rotates a powder feeder (10) in proportion to a frequency of an inverter (17) connected to the controller (18). The powder feeder (10) is installed on the resin extruder (20). The powder feeder (10) supplies the powder (Y) to the resin extruder (20) quantitatively by a feedback control that is executed at regular intervals. The resin extruder (20) heats and kneads the powder (Y) and a resin (X) supplied thereto from a hopper (21) to form a resin pellet P containing the powder (Y) and the resin (X) mixed uniformly with each other.

Abstract: An apparatus and method for forming tapered shakes with varying widths is provided. The apparatus and method include an extruder with a tapered configuration for making a tapered extrusion, a slitter for slitting the extrusion in a generally longitudinal direction, a cutter for cutting the extrusion in a generally transverse direction, and a timer for controlling operation of the cutter. The invention further provides for a continuous apparatus and method for continuously forming plastic tapered shakes that simulate traditional wooden shakes.

Abstract: Engaging surfaces for engaging with each other during a pressing operation and a pressing surface are provided in a mold that is composed of an upper mold part and a lower mold part. A guide channel is formed in the engaging surface provided by an inner surface of a side wall. When the upper mold part and the lower mold part engage with each other, the guide channel is covered by the engaging surface of the lower mold part to form a tunnel like passage. Lubricant that is introduced from a first aperture is recovered from a second aperture through the guide channel. Part of the lubricant that flows through the guide channel is supplied to the engaging surfaces.

Abstract: An excessive load detection device for an injection molding machine capable of detecting an excessive load exerted on the injection screw when the screw is driven with resin remaining unmolten in the heating cylinder. An output torque of the servomotor for axially moving the screw is limited to a predetermined value by a torque limiter and the screw is driven to move forward in a direction of injection by a predetermined amount at a predetermined velocity. If reference time elapses before the axial motion of the set amount is completed or a position deviation exceeds a reference value, it is determined that the remaining resin has low fluidity to cause an excessive load on the screw and an alarm is issued. When the axial motion of the screw is completed without an alarm, the screw is moved backward and forward alternately predetermined times. A servomotor for rotating the screw is driven in the same manner to detect an excessive load on the screw.

Abstract: A polymer pelletizing apparatus includes a device for automatically and electronically indexing (advancing) a set of pelletizer knives by a predetermined distance upon the expiration of a predetermined time period. This advancement is continued for the useful life of the pelletizer knives and is called the advancement cycle. The predetermined distance and predetermined time period are entered into a PLC. The PLC is connected to an external advancing device such that when the PLC determines that the predetermined time period has expired, the PLC causes the external advancing device to index or advance the pelletizer knives by a predetermined distance. This advancement cycle provides consistent wear of the pelletizer knives and accurately provides an estimate of the need for a knife change.

Abstract: An injection molding machine is disclosed. The machine includes a standby mode and an automatic restart mode. The machine can be programmed to automatically restart after a predetermined amount of time, with minimal effort required by a machine operator.

Abstract: An improved applicator die for alternately depositing different liquid coating materials on a moving web comprises a die body having switch bars for opening and closing respective flow passageways for supplying the different liquid coating materials to an elongated coating orifice from respective manifolds. The switch bars, flow passageways and manifolds are substantially as wide as and substantially parallel to the coating orifice of the die whereby changeover between different coating materials can be made very rapidly.

Abstract: A supply of pressurized gas is separated into a first quantity of pressurized gas at a first temperature and a second quantity of pressurized gas at a second lower temperature. The first and second quantities of gas are injected into molten plastic in an injection mold in a predetermined sequence to form a hollow molded plastic article. A controller independently controls the pressure and time of delivery of the first and second quantities of pressurized gas supplied to the mold. A third quantity of extremely lower temperature gas may also be supplied to the mold in a timed sequence with the first and second quantities of gas. A variable pressure regulator receives stored pressure signals from the controller and establishes the pressures of the first, second and the optional third quantities of gas independent of each other.

Abstract: Portable self-contained apparatus for repairing a glass windshield by filling a damaged area with a repair material. An injector nozzle having a reservoir for holding an uncured liquid repair material is sealed over the damaged area of the windshield by vacuum cups. The reservoir is automatically supplied with timed alternating vacuum and positive precision controlled pressures from a fluid pressure device controlled by preprogrammed computer circuitry which is responsive to conditions of timing controls and of sensor controls for measuring and regulating the amounts and durations of the vacuum and positive pressures applied to the reservoir.

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: An apparatus for cutting and dispensing segments of thermoplastic material into receptacles such as crowns includes a conveyor for conveying the crowns through a passageway at predetermined speeds, an extruder for extruding thermoplastic material through a discharge opening, a rotary knife having blades for cutting the extruded material into segments and depositing the segments into the receptacles as they are conveyed through the passage, and an adjustable belt drive system for rotating the blade in response to the conveying of the receptacles. The belt drive system includes a drive and driven pulley, two pairs of fixed idler pulleys, and a third pair of idler pulleys which are coupled to a laterally shiftable carrier.

Abstract: A mold apparatus and method is used to form a solid injection molded plastic part having no internal voids, a Class A finish, a sink-free exterior appearance surface, and unevenly distributed structural detail extending from the opposite surface, the detail including free-standing reinforcement ribs, attachment bosses, and the like. In the method the mold portions of the mold apparatus are closed, charges of molten thermoplastic and pressurized gas are sequentially injected into a mold cavity defining the shape of the desired part, and the mold portions are sequentially separated and closed. The pressurized gas forces the hot plastic away from one mold half and against the other mold half, and separation of the mold portions ensures uniform distribution of the pressurized gas behind the hot plastic, which pressure is maintained during cooling.

Abstract: An extrusion head for an extrusion installation for extruding plastic material and having two, three or four extrusion cylinders has a stationary part which is fixedly mounted on the discharge ends of the extrusion cylinders and has flow channels for directing extrudate leading from the cylinders to a central extrusion location at which there is a seat for an extrusion die. Two movable extrusion head parts are hinged on the stationary part for movement between a closed position in which the movable extrusion head parts define an extrusion orifice for the extrudate and hold the extrusion die on its seat and an open position for cleaning. The movable extrusion head parts are moved between open and closed position by piston-cylinder units having cylinders pivotally mounted on the stationary part and having piston rods pivotally connected to lugs on the movable extrusion head parts.

Abstract: A dough rounder machine for kneading and forming dough and similar plastic masses into uniformly shaped form in which the dough is placed in an annular die driven by eccentric drive means over a stationary horizontal tray table whereby to move the die in a generally circular orbit over the table. Dough placed in the die is overcovered by a weighted cover which orbits with the die and is gravity actuated to exert vertical force on the dough. Engagement of the dough with the table, orbiting die and cover serves to knead and roll the dough into a substantially spherical mass, the texture and density of which is regulatable by the cover weight and movement of the die over a limited time interval.

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 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: In a process and apparatus for the production of hollow bodies from thermoplastic material, the walls of the hollow bodies are of a laminate structure having at least first and second layers, by means of extrusion blow molding, the pressure within the extrusion head and more particularly at the location at which the laminate is formed by the discharge of flows of material from a storage chamber in the head is maintained within limits such as to avoid disturbing the laminate to such an extent as to have an adverse effect on its function. The pressure at the time of a transition between filling and emptying of the storage chamber and between emptying and filling of the storage chamber is maintained substantially at a pressure level which approximately corresponds to the storage chamber emptying pressure.

Abstract: Apparatus for "forming" (reshaping) plural dough balls on a conveyor including means for arranging the balls in a desired order on the conveyor. Included is a transfer conveyor with reciprocative end portion and funnel type means cooperating with ring means above a second conveyor for facilitating arranging the balls on the second conveyor and controls for the apparatus.

Abstract: An apparatus for operating an injection machine wherein the molding condition during the building up interval is automatically changed in accordance with such parameters as the metal mold temperature, resin temperature and the temperature of a portion of the heating cylinder to which resin is supplied from a hopper. The apparatus is constructed to facilitate the building up of the molding condition, thus decreasing the number of useless shots.

Abstract: A concrete block molding machine has a vibratible mold box incorporating at least one molding cavity for a cement mixture which is to be densified in the cavity. A continuously driven shaft assembly mounts an eccentric fixed portion and a circumferentially adjustable balancing mass. The shaft assembly has a cylinder with a piston therein, connected to the mass to produce rotary motion of the mass relative to the fixed eccentric portion. A spring of predetermined rate opposes this. The pressure of the fluid introduced is varied to change the amplitude of the vibration imparted during each cycle.

Abstract: A method for removing resin clogging a nozzle in a motor-driven injection molding machine, which is capable of removing resin clogged in the nozzle without an excessive load being continuously applied to a servomotor for driving a screw.When the nozzle is clogged with resin, pulse distribution to a servo-circuit is started to move the screw to a foremost position thereof (S1). If a feed stop state, wherein the pulse distribution is stopped by an increase of the deviation of an actual movement amount from a command movement amount for the servomotor above a predetermined value, is not ended before passage of a time set by a timer started at the time the feed stop state occurs (S3-S6), the forward movement of the screw is stopped by an alarm process (S7).

Abstract: A nozzle touch apparatus in an injection molding machine is provided, which is capable of preventing deformation of a stationary mold half due to a nozzle touch force applied thereto, and of making it possible to use a mold of a type liable to be deformed for production of precise molding products. Springs interposed between a seat plate of the nozzle touch apparatus and a projecting wall of an extruder base generate the nozzle touch force which varies in magnitude as a function of a compressed amount of the springs. Upon a mold lockup state being released, a ball screw is rotatively driven, so that the seat plate, which is integral with a ball nut engaged with the ball screw, retreats from its moved position at the mold lockup state, to reduce the nozzle touch force and prevent deformation of the mold.

Abstract: A method and apparatus for controlling the hydraulic pressure in an hydraulic clamping cylinder to correspond with a desired clamping force and to compensate for overshoot of the hydraulic pressure caused by time delays in operating the components in the hydraulic circuit. The control arrangement involves the sensing of the actual hydraulic pressure during the clamp force maintenance portion of a clamping cycle and comparing the actual pressure with a desired pressure to provide a correction signal to be utilized to control the operation of the hydraulic system during the next succeeding cycle so that the actual hydraulic pressure during the clamp maintenance portion of the clamping cycle during the next succeeding cycle results in a clamping force that is closer to the desired clamping force.