Abstract: A plastic blow molding system (20) and a method for blow molding utilize an in-mold labeler (24) and a method for in-mold labeling a rotary plastic blow molding machine (22) includes a dispensing assembly (38) having a dispensing wheel (42) that is rotatably mounted on a base (40) and supports a plurality of dispensing head assemblies (46) each of which includes a support (48) and a dispensing head (50). An actuator (56) including first and second cam mechanisms (58, 64) moves the support (48) of each dispensing head assembly (46) along the rotary path of movement of an adjacent open mold (30) of the blow molding machine and angularly positions the support in alignment with a moving mold parting plane of the adjacent open mold in a manner that permits high speed operation of the in-mold labeling. Label transfer apparatus (160) provides high speed labeling of the dispensing assembly.

Abstract: An unstable weighing due to the plunger sliding resistance in a prepla type injection molding machine is prevented by dividing control of the plunger retraction movement for the weighing into speed control and pressure control. A plastic resin supply start position and a forced retraction release position are set along the way of the plunger retraction stroke by reference to a weighing start position. A plunger is moved from the weighing start position after injection and pressure-keeping to a weighing stop retraction position. Plastic resin is supplied to the forward portion of the injection cylinder when the plunger attains the supply start position from the weighing start position. The plunger is moved by forced retraction up to the forced retraction release position by speed control; the weighing is stabilized by changing the speed control to the pressure control once the plunger attains the forced retraction release position.

Abstract: A method for protecting a mold of a servo-driven type mold clamping unit comprises the steps of (a) changing the torque output of the power source generated by a servo-motor subject to the position of a movable die of the mold, and (b) comparing the values set in an encoder of the servo-motor with signal received by the encoder when the movable die is in displacement so as to detect the presence of any foreign objects in the mold for determination of normal/abnormal handling control.

Abstract: A method of reducing the restrictions of mixing fiber reinforced plastic includes the step of first coating the fiber. The coating is of a sort which will prevent the fiber from beginning to absorb the plastic such that the combined plastic and fiber may be stored for a period of time. Once the combined fiber and plastic are moved towards a mold, a mix station preferably cracks the coating. This allows the fiber to absorb the plastic matrix. The combined fiber and plastic is then delivered into a mold. By allowing the fiber to be pre-mixed with the plastic, the requirement of a “mix room” for mixing fiber into a plastic matrix adjacent to a molding facility is eliminated.

Abstract: This invention relates to a method of producing a molded transparent covering member. The steps of the method comprise providing a silicon rubber material and a fluorescent substance together to form a material to be molded in a space between an inner surface of an upper mold and an outer surface of a lower mold; sand-blasting at least one of the inner surface of said upper mold and the outer surface of the lower mold; and injecting the material into the space formed between upper mold and the lower mold.

Abstract: A method of and an apparatus for precisely determining a separating force of a molded product from a mold by an ejector in an injection molding machine. A load exerted on an ejector mechanism in operation without a product molded in the mold is constituted by an inner resistance of the ejector mechanism. The inner resistance includes frictional force produced within the ejector mechanism and resilient forces of springs for returning ejector pins to retracted positions thereof. On the other hand, the load exerted on the ejector mechanism in operation with a product molded in the mold is constituted by the inner resistance and the separating force of the molded product from the mold. Thus, a difference between the loads detected in driving the ejector mechanism with and without a molded product at each ejector position precisely represents the separating force of the molded product from the mold.

Abstract: A back-flow prevention apparatus includes a screw body; a screw head attached to the screw body; a first resin passage formed on a first ring; a second resin passage formed on a second ring located adjacent to and rotatable relative to the first ring; a drive unit for rotating a screw; and a controller. A rotation restriction mechanism is disposed between the first and second rings such that communication is established between the first and second resin passages or sealing is effected upon rotation of the screw. The controller includes a resin-pressure reduction unit for reducing the pressure of resin in the space located forward of the screw head after completion of a metering step but before initiation of sealing. Since the pressure of resin in the space located forward of the screw head has been reduced when sealing is effected upon rotation of the screw, the resin in the space located forward of the screw head is prevented from flowing in the opposite rotational direction upon rotation of the screw.

Abstract: A retainer installation through hole is formed in a connector housing by an installation hole forming pin. After molding the connector housing and a retainer, the retainer is assembled from a side opposite the side where the installation hole forming pin is extracted for the retainer installation hole. Thus, since interference of the retainer installation hole with the retainer is avoided, a mold construction can be simplified. Further, since the direction of motion of the respective parts of a mold apparatus are only in biaxial directions of up and down and transverse (X,Y axis directions), the molding spaces of a plurality of connectors can be provided in the mold apparatus along a third axis direction (fore and aft direction, namely Z axis direction) in a line. Thus, the molding and assembling of parts for many connectors can be simultaneously carried out by a single mold apparatus.

Abstract: The invention comprises a mold useful for the preparation of a polyurethane based article comprising a metal coated on the surfaces to come in contact with the polyurethane materials wherein the coating is a continuous matrix of cobalt or nickel having dispersed in such discontinuous matrix a fluorinated polyolefin polymer. In another aspect the invention is a process for injection molding a part from polyurethane materials which process comprises injecting polyurethane based materials into a mold as described above, exposing the injected materials to conditions such that a solidified article is formed and removing the formed article from the mold. In another aspect the invention is an article comprising polyurethane material prepared by injection molding which contains about 0.5 percent by weight or less of an internal mold release and which can be coated in an industrial coating process without the need for a sealer coated on the article.

Abstract: The present invention is directed towards the hybrid combination of a drop gate injection molding system and a lattice gate. The lattice gate is located prior to the orifice of the drop gate. The lattice gate is comprised of a series of cross-direction flow channels through which the rubber flows, with mixing of the rubbers at the intersections of the flow channels. This hybrid molding system permits shorter cure times, and improved process cycle time for curing rubbers.

Abstract: An injection-molding process including kneading functional particles with a binder resin in a kneader, temporarily storing the kneaded material supplied from the kneader in a reservoir device and feeding the kneaded material stored in the reservoir device to an injection device, the reservoir device including a pair of reservoirs, the kneaded material stored in one reservoir device is fed to the injection device where the kneaded material is then injection-molded, and simultaneously the kneaded material is fed from the kneader to another reservoir device and stored in it. Then, the kneaded material stored in the other reservoir device is fed to the injection device where the kneaded material is then injection-molded, and simultaneously the kneaded material is fed from the kneader to the one reservoir device and stored in it, so that the injection molding process is conducted by alternately repeating the above steps by switching operations.

Abstract: Machine for the production of receptacles of plastic. A stretching rod (32) is displaced by actuating means (69) comprising a servo-motor (72) whose operation is controlled by a controller installation (73) by means of an adjustment loop (75). The blowing air is introduced into the preform via a servo-valve (60) whose operation is also controlled by this installation (73) by means of an adjustment loop (76) which can be combined with the first adjustment loop (75). It is thus possible to control in a precise manner the process of transformation of a preform into a receptacle by means of curves of stretching and pressure increase. Calibration operations of the maximum path of the stretching rod as a function of the length of the mould cavities and calibration operations of the path of positioning of the stretching rod as a function of the preform can be carried out easily and in an automated fashion, thereby ensuring excellent safety of production and very high adaptability to all conditions of production.

Abstract: A method of predicting optimal injection molding cycle time includes the steps of performing a thermal analysis through a thickness of a part made using an injection mold, calculating shrinkage as a function of cooling time, calculating friction forces between the part and mold, calculating ejection forces based on the coefficient of friction and the calculated shrinkage calculating the induced stress in selected high stress areas on the part, and comparing the induced stress with material yield stress to determine an optimal cycle time window within which the part can be ejected without being damaged.

Abstract: A method of controlling operation of an injection molding system in which at least one injection molding device successively executes an injection molding operation thereof so as to successively produce the molded product, and at least one takeout device successively takes out the molded product from the corresponding injection molding device so as to successively transfer the molded product to a subsequent-step part in which the molded product is further processed, while a monitoring device is arranged for detecting an abnormal operation in the subsequent-step part and generating an abnormal signal upon detection of the abnormal signal, the method comprising the steps of: changing an operation mode of the at least one of takeout device so as to transfer the molded disk to another part which is separate from the subsequent-step part, upon generation of the abnormal signal by the monitoring device; and extending a cycle time of the injection molding operation of the at least one injection molding device upon g

Abstract: A method of making an injection molded article, including the steps of: mixing at a temperature of at least 100° C. polymeric materials having a thermal conductivity in the range of 0.001 to 0.01 cal/cm-sec-° C. wherein the polymeric materials are selected from the group consisting of polyethylene, polystyrene, polyester, and polycarbonate or combinations thereof, and one or more materials selected from the group consisting of ceramics, ceramic composites, metals and metal alloys in a blended relationship to form a viscous phase mixture, the materials in the viscous phase mixture being selected so that when in a solid phase it has a density greater than 4 grams/cc and a thermal conductivity greater than 0.101 cal/cm-sec-° C. to form a feedstock; cooling the blended viscous phase mixture to form the feedstock; and using the feedstock in an injection molding machine to form the article.

Abstract: A method for controlling a screw position of a screw in an injection molding machine uses a high-speed injection and high-speed depressurization method to perform the entire injecting process by controlling speed of the screw. The screw is moved forward to a predetermined first position from an injection start position, and when the screw reaches the predetermined first position, the screw is moved backward to a predetermined second position. The speeds of the forward and backward movement of the screw are controlled in accordance with a screw-position/speed characteristic pattern which is measured in advance, and which is derived from the equation V=(2·K·S)½ where V is screw speed, K is screw acceleration, and S is screw position.

Abstract: The invention relates to a method of producing an automotive vehicle body part (1) by injecting a plastics material sequentially into a mold fed by one or more cold runners, the method consisting in filling firstly a first region (A) at one end of the mold, then a second region (B) adjacent to the first region, and repeating the operation consisting in filling a new region adjacent to the preceding region each time, until a last region (C) of the mold is reached at its end opposite from the first region (A). Each cold runner is shut off using a cold rod which is axially movable in a bore intersecting the cold runner, the longitudinal section of the rod overlaying the cross section of the runner.

Abstract: In a method for controlling an injection molding machine, a screw is advanced from an injection start position by means of velocity control, and when the screw reaches a control changeover point, pressure control is effected in place of the velocity control to apply pressure to the screw. Preliminary molding is performed to obtain an acceptable product; a total charged amount of resin during the preliminary mold is obtained on the basis of a movement distance over which the screw has moved before reaching the control changeover point during the preliminary mold; and the total charged amount is stored as a changeover target value. During ordinary molding, a total charged amount of resin is obtained on the basis of a movement distance over which the screw advances from the injection start position; and pressure control is started when the total charged amount reaches the changeover target value.

Abstract: A control method for an injection molding machine comprises the steps of measuring a density of a molten resin in a heating cylinder, controlling a stroke of an injection screw in an injection process by feed forward control based on the measuring step, and controlling an operating parameter of the injection molding machine based upon the measuring step.

Abstract: The retreat completion position of the screw in the charging step in actual production is controlled based on the result in pilot production as follows. In pilot production, the measurement value Ts of the screw driving torque is integrated with respect to the screw position P from the forward limit to the retreat completion position Ps. When conforming item is produced in the pilot production, the value &Sgr;Ts·dP obtained as a result of the integration is stored as a reference value. After actual production begins, the measurement value Tx of the screw driving torque is integrated in real time with respect to the screw position P from the forward limit to the screw position at each time. The obtained value &Sgr;Tx·dP is monitored. When this value &Sgr;Tx·dP coincides with the reference value &Sgr;Ts·dP, it is determined that the charging step has been completed, and the retreat operation of the screw is stopped.