Abstract: A material feed system provided with a plurality of injection molding machines. A filling station is provided and has a resin tank in which resin material is stored, a container to which the resin material is fed from the resin tank, and a coupling device for coupling the resin tank and the container on demand. A carrier having a clamping mechanism runs along a track which is laid so as to pass over the injection molding machines and the filling station. The coupling device is controlled by a control unit. The control unit also controls the movement of the carrier to thereby transport the container by the use of the clamping mechanism and to feed the resin material from the container to the injection molding machines.

Abstract: In an injection molding machine having at least four motors (18 to 21) and a control section (22) for controlling the four motors to carry out a predetermined injection molding process divided into a plurality of steps, the four motors are grouped into first and second groups so that the motors of each group have driving durations which are not overlapped with one another and which may be overlapped with those of the motors of another group. The control section has first and second control unit (24 and 25) coupled to the first-group motors and the second-group motors for individually and selectively controlling the first-group motors and the second-group motors.

Abstract: A closing device for molds for the manufacture of articles of thermoplastic material. Two die plates are linearly displaceable on guide beams and movable by means of a power drive in opposite directions relative to each other. The device includes a frame with at least one tension rod, a compression rod and two yokes connecting the ends of the rod. The rods extend parallel to and the yokes extend transversely of the direction of displacement of the die plates. One yoke has a cantilever arm with which it acts directly on one of the die plates. The other yoke is connected with the second die plate with the intermediate arrangement of the power drive. The frame with the power drive is suspended in a housing which is fixed with respect to space. The housing supports the guide beams which are independent of the frame.

Abstract: For automotive interior trim molding assemblies having a vinyl skin shell, a reinforcement insert, and an intermediate reaction type polyurethane foam composition, a vinyl skin shell which has a gasket-type peripheral edge formed thereon for abutting cooperation with the reinforcement insert to prevent leakage of the foam therepast during the foam reaction period in a reaction mold. The gasket-type peripheral edge is formed on the otherwise thin shell by a tear edge, against which plastisol builds up in a substantially triangular cross section during the shell molding period in a heated slush mold.

Abstract: An injection nozzle for an injection molding machine having a heating device for heating its injection nozzle body (3) protruding from the front end of the heating cylinder (1) thereof. The heating device is composed of a plurality of heating members (7, 10) longitudinally arranged side by side. The temperatures of the different nozzle body sections heated by the respective heating members are individually detected (9, 11), the heating members (7, 10) being individually controlled in accordance with the temperatures thus detected. The construction enables the different nozzle body sections to be individually set to a desired, optimum temperature. The nozzle front end section 3b, for example, which is in contact with a metallic mold and whose temperature is consequently apt to be lowered can be kept high, and the nozzle middle-rear section 3a, which is near the heating cylinder and whose temperature is consequently apt to be raised, can be kept low.

Abstract: A twin screw extruder which significantly reduces extruder wear through provision of separate, complemental, interfitted frustoconical screw and barrel sections adjacent the outlet end of the extruder barrel which create an even, bearing-type support for the rotating screws as material passes through the apparatus. In preferred forms, the screws are intermeshed along the majority of the extruder barrel, but diverge at the region of the final frustoconical screw sections and are received within respective complemental barrel sections; in this fashion the material being processed is split into juxtaposed, non-communicating streams, and thereby evenly flows around and supports the adjacent screw section to lessen the tendency of the screws to separate themselves and come into wearing contact with the surrounding barrel walls. The extruder can be used to process a wide variety of plant-derived materials, but is particularly useful for viscous substances (e.g.

Abstract: In a die clamping apparatus including a fixed die plate, a movable die plate, a device for moving the movable die plate relative to the fixed die plate, a device for fixedly coupling the fixed die plate with the movable die plate and tie bars for carrying out clamping of dies, the tie bars are fixedly secured to the fixed die plate and a hydraulic cylinder having a ram is provided on the movable die plate, or vice versa. The coupling device has a half-nut provided on the surface of the fixed die plate so as to be movable in the axial direction of the tie bar insert hole, and are provided on the outer circumference of the tip end of the tie bar and are adapted to mesh with the half-nut. A stopper is provided between the fixed die plate and the half-nut. A part of the ram is made to butt against the stopper to position the ram in the axial direction of the tie bar insert hole. The end surface of the half-nut opposed to the ram is brought into pressing contact with the ram.

Abstract: An apparatus for obtaining a negative pressure in chambers formed by a flat extractor plate supporting frustoconical or truncated pyramidal objects thermoformed from a sheet of synthetic material, embodying a flat extractor plate for hollow frustoconical or trucated pyramidal objects which when resting their rims on the flat surface of the extractor plate form chambers, wherein a suction unit is connected with said chambers by means of a pipe and a connecting cavity and wherein are provided a shut-off valve and an air intake(20) adjustment valve between the unit and the said valve, wherein each chamber is provided with at least one intake for atmospheric air into the chambers (17), wherein the cross-section of the intakes (20) is variable.

Abstract: A plastic material molding apparatus, wherein when the pressure at a material inlet of a cylinder of a material holding mechanism increases as a piston in the cylinder compresses a resilient member provided in the material holding mechanism, the speed of a motor for driving a material fluidizing mechanism is reduced. A servo motor for intermittently driving a plastic material metering and delivering mechanism is controlled according to the revolution speed and a predetermined total number of revolutions of the servo motor and to the number of pulses from a pulse generator provided in the servo motor. A relief valve is interposed between a material delivery port and a delivery nozzle of the metering and delivering mechanism, the relief valve being adapted to open when the material pressure at the delivery port is higher than the relief pressure, the relief pressure being set higher than the vapor pressure according to the temperature of the material at the delivery port.

Abstract: A system for the rapid clamping of dies on a horizontal press for the injection moulding of plastics materials consists of a pair of structures fixed permanently along two opposite sides of the fixed and movable plates of the press and defining therewith two guides adapted slidably to receive the fixing flanges of the respective die. Motor-driven clamping means are associated with these guides and are operable simultaneously to clamp the fixing flanges of the die to the attachment structures.

Abstract: There is provided a direct mold clamping apparatus with an ejector, which is capable of uniformly applying a mold clamping force to a movable platen and is simple in construction and compact in size. A hollow cylindrical push member (12) and a movable platen (3) are coupled to each other through a single junction plane, in the form of an annular ring. A driving force transmitted through the push member is applied uniformly to the movable platen. The ejector (1) of the mold clamping apparatus (2) is provided with a ball nut (7) disposed in a hollow portion of the push member. A ball screw (6), which mates with the nut, is coaxial with a ball screw (8) for mold clamping, and has a front end fixed to an ejector pin (4) and the rear end portion removably fitted in a hole (8a) in a front end portion of the mold clamping ball screw. Thus, the axial length of the mold clamping apparatus is reduced.

Abstract: This invention relates to an injection molding nozzle having an improved heating element configuration in the tapered nose portion and a method of making it. A longitudinal portion of the heating element which is integrally brazed centrally into the nose portion is bent back upon itself at least once to provide a multiple thickness part. The type and length of the multiple thickness part which is selected to provide additional heat depends upon the application which the nozzle is to be used for. The multiple thickness part of the heating element is swaged to provide a more circular cross-section before being brazed into a larger diameter part of the heating element bore through the nose portion of the nozzle.

Abstract: An injection molding machine has an injection molding unit shiftable parallel to itself into a selected working position, dependent upon the location of the injection opening of the mold closing unit. The latter includes a stationary mold carrier having parts defining guide grooves oriented transversely to the injection axis. The injection molding unit has hydraulic power cylinders arranged symmetrically to the injection axis. Each hydraulic power cylinder has a piston rod on which the injection molding unit is supported. Each piston rod has a coupling terminus received in a respective guide groove for guiding the respective piston rod therein during motion of the injection molding unit between working positions. The coupling terminus of each piston rod is prevented by the respective guide groove from moving in a direction parallel to the longitudinal axis of the respective piston rod, whereby the piston rods are axially immobilized.

Abstract: A multi-cavity mold in combination with a hot runner system wherein the hot runner system includes metering means individual to each mold cavity for feeding precisely measured quantities of thermoplastic material to each cavity.

Abstract: The reinforcing skeleton for use in an injection molding machine comprises skeleton elements having tracks for engaging stationary rollers for guiding a plasticizing cylinder during cyclic axial reciprocating motions performed by the injecting unit during an injection molding sequence. The skeleton elements include track bars spaced from a central length portion of the plasticizing cylinder by radial spacers. One of the spacers has a plate secured to the track bars and to the plasticizing cylinder. Two centering spacers are connected to the track bars and surround the plasticizing cylinder as a sliding fit.

Abstract: An injection molding machine has a mold closing unit arranged on a machine bed and adapted to selectively receive a first type of mold assembly having a central injection opening or a second type of mold assembly having a non-central injection opening; a platform mounted on the machine bed; and an injection molding unit supported on the platform. The injection molding unit includes a carrier block; a plasticizing cylinder received in the carrier block and a feed screw received in the plasticizing cylinder. The injection molding unit is pivotal by a drive into a first working position in which the injection molding unit cooperates with a mold assembly of the first type or into a second working position in which the injection molding unit cooperates with a mold assembly of the second type. The platform has two parallel-spaced side plates which flank the carrier block.

Abstract: An apparatus for encapsulating selected portions of the printed circuit board in a pin grid array using transfer molding techniques. In one embodiment for encapsulating only the top surface and side edges of the board, a vacuum is provided in the lower cavity to hold the edges of the bottom surface of the board flush against the mold plate. In a second embodiment for encapsulating all exposed surfaces of the board, the array pins are inserted in holes in the bottom of the cavity and supported by an adjustable block which positions the board in the cavity.

Abstract: A cassette-type molding die comprises a die plate unit having fitting bores and a cassette die unit including movable and stationary cassette plates between which a molding cavity is defined, an ejector cassette plate, and ejector pins disposed between the movable cassette plate and the ejector cassette plate. The cassette die unit can be detachably inserted into the fitting bores of the die plate unit. As a result, the cassette die unit can be easily exchanged with another cassette die unit while the movable and stationary die plates of the die plate unit are very close together. This speeds up the process of changing cassette die units, and also allows for the overall cassette-type molding die to be smaller than conventional units.

Abstract: A screw type, polymeric material extruder with an elongated body having a cylindrical bore with a hollow screw in the bore, the screw having external and internal threads. A cylindrical body is within the internal threads, and the screw with the wall of the bore and with the cylindrical body forms, respectively, an external material flow chamber and an internal material flow chamber. The cylindrical body can have channels for heating fluid and for additives or dyes. The screw can have openings for feeding one material to a single extrusion head with one mouth by way of both chambers, or the chambers can be supplied with the same or different materials which are fed by way of the chambers to an extrusion head with two mouths for applying the latter materials separately.

Abstract: A die mold for the production of a fitting to be surrounded by a single-piece ring includes mold components separable along a plane extending parallel to the longitudinal axis of a fitting to be produced, the mold components having therein a recess into which is inserted the ring. A closure member closes the recess during molding and forms a wall of the die mold. The closure member is divided peripherally into plural portions each of which is of unitary and single-piece construction in a direction parallel to the longitudinal axis and which extends in such direction beyond at least one axial end of the recess.