Abstract: A process producing an in-mold coated molded product. The process molds a thermoplastic resin material under a mold-clamping pressure in a mold including a fixed mold part and a movable mold part each heated at a predetermined temperature, separates the fixed mold part and the movable mold part when the molded material surface is solidified such that it is durable to a pressure of injection and flow of a coating agent, and injects the coating agent containing a thermosetting resin material between an inner surface of the mold and the molded product obtained. The process also coats the molded product surface with the coating agent as the mold is re-clamped after injecting the coating agent, takes out the molded product coated with the coating agent when the coating agent is cured such that it is neither peeled off nor cracked by opening the mold, and re-heats the molded product after taking it out.

Abstract: The stem slide device of the present invention in an extruder has a stem vertical movement support (71) and slide guide members (72-1, 2) fastened to the support and forming guide grooves. A stem (6) pushing against a billet loaded in a container is held at the slide table (73) horizontally. The slide table slides in the vertical direction along the vertical face of the support. When the slide table is positioned at the bottom end of the guide groove, the hydraulic cylinders (77-1, 2) are driven so that the rods (78-1, 2) push the back surface of the slide table against the vertical face of the support. Therefore, the axis of the stem is held matched with the axis of the container.

Abstract: A method for injection foaming molding of a thermoplastic resin includes the steps of (1) injecting the foaming-agent-containing plasticized resin from an injection apparatus 30 to fill a mold cavity 10a, (2) releasing a clamping force of a mold 10 immediately after the foaming-agent-containing plasticized resin is injected and filled into the mold cavity 10a, so as to release the pressure of the foaming-agent-containing plasticized resin in the mold cavity 10a, (3) maintaining the pressure-released state of the foaming-agent-containing plasticized resin in the mold cavity 10a for a predetermined period of time, (4) expanding the mold cavity 10a to foam the foaming-agent-containing plasticized resin, and (5) cooling and maintaining the foaming-agent-containing plasticized resin while the mold cavity 10a is in the expanded state.

Abstract: An injection-foaming molding process for manufacturing a formed article by injecting a molten resin containing a foaming agent into a cavity of a mold being retained in an openable state and then expanding the cavity by opening the mold to allow the resin to foam includes: i) a step of discontinuing a cavity of a mold from a resin-reserving section located at front end of a screw immediately after the completion of injection of a molten resin containing an expandable resin into the mold cavity; and ii) a step of keeping the resin-reserving section under pressure at least equal to back pressure for charging during a period from the completion of injection to start of charging the molten resin containing the expandable resin for next shot, decreasing pressure in the resin-reserving section to back pressure for charging, and then starting the charging.

Abstract: The mold for in-mold coating formation is one including a mold main body 30 having, provided thereinside, a mold cavity 5 permitting injection molding of a resin molding with coated surface and a coating material injecting unit 50 capable of injecting a coating material to an area corresponding to the coated surface of the resin molding, within the mold cavity 5, in which a groove portion 3 of 0.3 to 1 mm width (W) is provided on the peripheral edge 15 of the mold, and in which the angle (?1) made by the inner circumferential surface 25 of the mold and the mold-opening-side internal wall surface 27 of the groove portion 3 is in the range of 30° to 70°.

Abstract: A rotational angle of a motor operative to propel forward a screw in an injection molding machine is detected at an encoder. An output from the encoder is employed to obtain an angular velocity ? of the motor. From the obtained angular velocity ?, an estimated melt pressure value ?? that contains no differential term is derived using a certain observer theory. The estimated melt pressure value ?? is employed to calculate a torque command value TCMD for the motor, which is fed back to the motor. Thus, precise propelling power control unaffected by noises can be executed without the use of a pressure sensor such as a load cell.

Abstract: A stem slide apparatus comprises a stem slide base (73) with a stem (6) horizontally mounted thereon to press a billet (B) mounted on a container (5), a slide guide member (72, 72a, 72b) mounted on a vertical stem move support member (71) and formed with guide grooves in which the side end portions of the stem slide base are fitted and vertically slid, and a lock means (77a, 77b) arranged on the slide guide member to press the side end portions of the stem slide base. The stem slide apparatus further comprises a drive mechanism (10) having an electric motor (11) to move the slide base in the sliding direction. Therefore the indirect cause of a fire is removed and the maintenance work simplified.

Abstract: A multilayer-molding method includes the steps of mixing at least one thermoplastic resin selected from a plurality of types of thermoplastic resins with a bubble-nucleating agent and a foaming gas, injecting the plurality of types of thermoplastic resins into a mold cavity such that the thermoplastic resins are layered in the mold cavity, and then, after increasing the volume of the mold cavity, foaming the at least one thermoplastic resin mixed with the bubble-nucleating agent and the foaming gas. The multilayer-molding method is characterized in that the foaming gas is supplied at a pressure of 0.1 MPa or more but less than 1.0 MPa to at least one injection-molding machine selected from a plurality of injection-molding machines, and that the thermoplastic resin plasticized in the injection-molding machine is mixed with the foaming gas.

Abstract: A die casting machine that suppresses the occurrence of surge pressure, prevents the occurrence of burrs and spouting of molten metal, and further minimizes variations in the quality of a molded product on site. The die casting machine comprises a mold (101) that cast-molds a product, an injection cylinder (102) for injecting molten metal (15) to the mold, and a hydraulic device (103) for pressing under high pressure the injection cylinder. The hydraulic device comprises a piston ACC (20) that supplies hydraulic oil to press under pressure a piston (13) of the injection cylinder (102) and an injection cylinder inlet valve (31). The piston ACC comprises a high pressure fast pressure-raising piston accumulator (22, 322) and a low-pressure injection piston accumulator (21, 321).

Abstract: The present invention provides an extrusion press and an extrusion control method capable of obtaining a uniformly-shaped extruded product by constantly applying a constant container sealing force between a container and a die even when an extrusion force varies during an extrusion process, improving product yield, and keeping a small energy consumption at the time of extrusion. A hydraulic pressure of a main cylinder device is detected, a deviation between the detected hydraulic pressure and a reference pressure set in advance is mathematically processed, and constant pressure extrusion is performed by correcting a container sealing force to reduce the container sealing force when the deviation is larger than the reference pressure, or to increase the container sealing force when the deviation is smaller than the reference pressure, so that a container sealing force corresponding to the reference pressure acts on the end surface of the die.

Abstract: A discard conveying apparatus comprising a chute provided below a die of an extrusion pressing machine in which discards are freely dropped along the chute through which the discards are guided, in which the discard conveying apparatus comprises a chute having a discharging port in a position which is approximately just under the dies, a bucket for containing the discards disposed in the discharging port of the chute, and a transporter capable of freely moving the bucket in a forward and backward direction, the transporter being attached to a machine base in the direction of crossing to an axis line of the machine base in the manner of being passed through the machine base and supporting an inversion axis of the bucket, and the bucket is turned and inversed when the bucket is transported to an end portion of the forward movement.

Abstract: The stem slide device of the present invention in an extruder has a stem vertical movement support (71) and slide guide members (72-1, 2) fastened to the support and forming guide grooves. A stem (6) pushing against a billet loaded in a container is held at the slide table (73) horizontally. The slide table slides in the vertical direction along the vertical face of the support. When the slide table is positioned at the bottom end of the guide groove, the hydraulic cylinders (77-1, 2) are driven so that the rods (78-1, 2) push the back surface of the slide table against the vertical face of the support. Therefore, the axis of the stem is held matched with the axis of the container.

Abstract: An extrusion molding method of an extrusion press includes a first step of loading a billet, the outer surface of which is subjected to a barking treatment, into a container, and extruding the billet in such a manner as to leave a predetermined length, a second step of loading a next billet into the container, additionally extruding the preceding billet with the succeeding billet in such a manner as to leave a predetermined length of the succeeding billet; and a third step of loading a next billet into the container and additionally extruding the preceding billet with the succeeding billet in such a manner as to leave a predetermined discard length of the succeeding billet and stopping extrusion. By way of these steps, the container does not move while maintaining contact with a die, and the billet is continuously extruded by leftover and additional extrusion.

Abstract: A clamp includes (a) a first engager that engages with engagement parts formed at ends of the tiebars at the moving platen side after moving the moving platen in the fixed platen direction to close a die or mold, in the tiebar insertion holes of the moving platen, (b) a second engager that engages with engagement parts formed at ends of the tiebars at the fixed platen sides detachably at ends of clamping pistons using a detachable engager, (c) a pushing device that cooperates with the tiebars and pushes the moving platen after die or mold closing against the fixed platen in the tiebar insertion holes of the fixed platen, and (d) a tiebar inserting and extracting device coupled with ends of the tiebars at the fixed platen sides at a side of the fixed platen opposite to the die or mold mounting surface.

Abstract: A method for injection foaming molding of a thermoplastic resin includes the steps of (1) injecting the foaming-agent-containing plasticized resin from an injection apparatus 30 to fill a mold cavity 10a, (2) releasing a clamping force of a mold 10 immediately after the foaming-agent-containing plasticized resin is injected and filled into the mold cavity 10a, so as to release the pressure of the foaming-agent-containing plasticized resin in the mold cavity 10a, (3) maintaining the pressure-released state of the foaming-agent-containing plasticized resin in the mold cavity 10a for a predetermined period of time, (4) expanding the mold cavity 10a to foam the foaming-agent-containing plasticized resin, and (5) cooling and maintaining the foaming-agent-containing plasticized resin while the mold cavity 10a is in the expanded state

Abstract: By managing a coating material injection time and the like parameters so that they may be controlled within specifically determined ranges, an in-mold coating formation method is provided for manufacturing a molded product coated with a coating layer having a uniform quality in its outside appearance. By continuously and unifyingly managing a mold opening amount and a mold closing force, an in-mold coating formation method and an in-mold coating formation apparatus are provided which are so formed that, if the control of a mold closing force and the control of a mold opening amount are continuously changed and at the same time a high precision and a high response are maintained, it is possible to enlarge a selectable range for selecting a molding condition, thereby producing an integrally formed molded product having an excellent outside appearance and whose coating layer has a high adhesion strength.

Abstract: A multilayer-molding method includes the steps of mixing at least one thermoplastic resin selected from a plurality of types of thermoplastic resins with a bubble-nucleating agent and a foaming gas, injecting the plurality of types of thermoplastic resins into a mold cavity such that the thermoplastic resins are layered in the mold cavity, and then, after increasing the volume of the mold cavity, foaming the at least one thermoplastic resin mixed with the bubble-nucleating agent and the foaming gas. The multilayer-molding method is characterized in that the foaming gas is supplied at a pressure of 0.1 MPa or more but less than 1.0 MPa to at least one injection-molding machine selected from a plurality of injection-molding machines, and that the thermoplastic resin plasticized in the injection-molding machine is mixed with the foaming gas.

Abstract: An in-mold coating molded article is obtained by coating the surface of a resin molded product comprising a hydroxyl group-containing polypropylene resin composition (A) with a paint composition for in-mold coating, wherein the composition (A) comprises a polypropylene resin (i), an additive rubber (ii) and optionally a polymer compound (iii) other than the polypropylene resin (i) and the additive rubber (ii), the total hydroxyl value of the polypropylene resin (i), the additive rubber (ii) and the optional polymer compound (iii) is from 1 to 40, the composition (A) has a rubber component content (total of the amount of the additive rubber (ii) and the amount of components soluble in n-decane at 23° C.

Abstract: An injection-foaming method for a thermoplastic resin comprising using an injection unit 30 provided with a hopper 35, a plasticizing cylinder 31 and a screw 32, and a mold 10 having a mold cavity 10a of changeable capacity; filling the mold cavity 10a with a foaming-agent-containing melted resin injected from the injection unit 30; and then enlarging the mold cavity 10a for allowing the foaming-agent-containing melted resin to expand, wherein inclusion of a foaming agent into a thermoplastic resin is done by using a mixture of a foam nucleating agent and a foaming gas as foaming agent, feeding the mixture to hopper 35 or plasticizing cylinder 31 and screw 32 of injection unit 30 at a pressure of 0.1 MPa or more and less than 1.0 MPa, and contacting the mixture with a pre- or post-plasticized thermoplastic resin present in hopper 35 or plasticizing cylinder 31 and screw 32.

Abstract: An in-mold coat-forming mold and an in-mold coat-forming method are provided, wherein the mold prevents leakage of a coating material for the long term, which is likely to occur when the in-mold coat-forming method is carried out. By disposing a grove, a pressure piece, or both of them so as to serve as coating-material leakage-preventing means, in the vicinity of the edge of a mold cavity adjacent to a shear-structured engaging portion disposed along the circumference of the mold cavity, a coating material is prevented from leaking out of the mold from the engaging portion, and problems such as an adverse affect on a formed product caused by the leaked coating-material and a damage on the mold are prevented, whereby in-mold coat-forming is stably performed for the long term.