Abstract: A rapid-change system for injection-molding machine has a pair of adapter plates secured to the respective mold parts which engage in guides of the mold-carrying plates of the machine so that nothing projects outwardly beyond these adapter plates. Locks on the mold-carrying plates hold the adapter plates in position and the plates can be provided with service fittings which interconnect and disconnect upon insertion and removal of the molds together with the respective adapter plates.

Abstract: A compaction mill 10 comprises a rotary die plate 12 and a plurality of compaction rollers 14 spaced circumferentially along the inside of the die plate. Sprockets and chains provide a positive drive connection between the die plate 12 and the compaction rollers 14, ensuring that, in operation, there is substantially no relative slip between the outer peripheries of the rollers and the inner periphery of the die plate, where they are closest together. Guides 44 cooperating with sliding blocks 38, 40 constrain the rollers 14 against rotation about the axis of rotation of the die plate, whilst permitting guided displacement of the rollers in a radial direction with respect to said axis. Wedge members 46, 48, a screw threaded rod 50, and nuts 52 are provided to permit adjustment of the gap between the rollers and the die plate, and to make radial displacement of the individual rollers interdependent.

Abstract: Coloring composition for colouring polyvinylchloride comprising at least 40% by weight of coloring pigment and at most 60% by weight of glycerolmonostearate. The composition may be added directly to extruder for extruding polyvinylchloride, the amount of glycerolmonostearate in the moulded article as obtained being restricted to at most 5%.

Abstract: An annular spacer to be used, during the vulcanization in a metal mold of an unvulcanized rubber hose having a mandrel pierced therethrough, as fitted around the mandrel in intimate contact with either of the opposite ends of the aforementioned unvulcanized rubber hose. This annular spacer has an outside diameter greater than the inside diameter of the depression in the aforementioned metal mold and an inside diameter enough for the spacer to be inserted around the aforementioned mandrel, contains in the periphery thereof a plurality of grooves formed in the axial direction of the spacer, and is made of a material softer than the materials of the aforementioned metal mold and mandrel. By the use of such spacers of this invention having the aforementioned characteristics, therefore, rubber hoses of a fixed outside diameter can be manufactured in any desired length in one and the same metal mold.

Abstract: A simple economical multistage vulcanization process is disclosed for producing premium anomaly-free tires wherein the inner liner or curing bladder is supplied with dead end water and steam sequentially in several stages at high pressures which assure thorough diffusion of entrapped air. The internal steam pressure is 250 to 300 psig in stage I to effect rapid heat transfer, the internal water pressure in stage II is from 300 to 450 psig, and the internal steam pressure is 250 psig or higher in the first part of stage III. The overall cycle time for curing radial passenger car tires in "Bag-O-Matic" presses is reduced one minute or more by using internal steam pressures from 250 to 300 psig in stage I and III and reducing the steam pressure near the end of stage III to boil off the residual water.

Abstract: A punching tool for use in a tablet making machine includes a body portion having at least one bore extending from an end of the holder a preselected distance into the holder. The bore is internally threaded a preselected depth. An interchangeable punch is threaded into the punch holder bore and extends a selected length from the holder. The end of the punch has an externally threaded portion and a cylindrical portion. The cylindrical portion is positioned between the threaded portion and the portion of the punch that extends outwardly from the holder. The cylindrical portion has a diameter that permits it to move freely without interference into and out of the internally threaded bore. The bore has an enlarged thread configuration provided with cylindrical bearing surfaces between threads. The punch threaded portion has a thread configuration corresponding to the configuration of the threaded bore to permit rapid engagement and disengagement of the punch in the bore.

Abstract: In a modified "Conform" machine for continuous friction-actuated extrusion of metals, especially particulate copper, the abutment at the outlet end of the working passageway does not fully block the end of the wheel groove. Instead a substantial clearance is left, and metal extruding through it adheres to the wheel to re-enter the working passageway at the entry end. Preferably the abutment is of semicircular cross-section. For a given output rate, a significant reduction in torque, and working stresses, is obtained.

Abstract: A device for monitoring the filling level of the degassing space in an extruder used for processing thermoplastic materials comprises a level detection orifice located in the degassing dome or jacket of the extruder which opening is connected to a conduit. The conduit leads through a regulator device to a gas source. Connected to the conduit, between the regulator device and the orifice, is a pressure sensor such as a pressure difference switch. If the level of molten material in the dome rises above a preselected level, it blocks the opening and produces a back-pressure in the conduit. The switch is automatically actuated by this back-pressure and produces a signal. Appropriate action can then be taken to prevent the further rise of the molten material in the dome and to prevent blockage of the degassing device.

Abstract: An improvement in briquetting presses and the like comprises a wear ring, a press cone, an end tube and a press cylinder which is diametrically slotted and encloses the press cone and the end tube, said parts being secured to a machine frame. To facilitate the dismounting of the abovementioned parts the press cylinder is suspended in a pair of brackets which project from the machine frame in such a way that the press cylinder together with the press cone and the end tube is displaceable away from the machine frame and after such displacement is rotatable on an axis which is substantially perpendicular to the central axis of the press cone and the end tube. A hydraulic jack associated with the press and designed to cooperate with the press cylinder comprises a yoke and a bail which together enclose the press cylinder at the compression of its two slots.

Abstract: A backflow preventer at the end of an injection molding worm has a pressure ring which abuts directly upon the worm and serves a shank of the valvehead which also bottoms in a bore upon the worm so that force transmission to the worm is over its entire cross section. The shank is surrounded by a blocking ring which can shift in its axial stroke between a position in which it abuts the head and a position in which it abuts the pressure ring, the axial stroke being adjustable by shims forming the floor against which the shank abuts within the bore of the worm.

Abstract: A device for producing information recording disks comprises a stamper mount for placing a stamper thereon, a stamper-fixing shaft for fixing the stamper, and a pressing plate for pressing a backing plate toward the stamper after a liquid resin is injected in the space between the backing plate and the stamper. Injection is effected via a passage made at the center of the stamper mount, and the injected resin is stretched outwardly radially by pressing the backing plate. An ultraviolet ray is irradiated to the stretched resin through the backing plate to harden the resin. An injection valve movably received in the stamper-fixing shaft may be used so that uninjected resin is prevented from being hardened. The injection valve may have a center projection as well as a flange portion at its top so that machining for making a center hole of the disk is unnecessary. The periphery of the flange portion may be wetted by the resin before the backing plate is placed on the flange portion.

Abstract: An injection-molding machine whose mold-carrying plates are provided with quick-release locking devices for engagement with adapter plates on respective halves on the mold, also has at least one of the plates provided with a horizontal transverse guide for the mold whereby the mold can be inserted laterally and removed laterally. A carriage is displaceable along the machine and has roller conveyors and a device for drawing a mold from the machine onto the roller conveyor or pushing a mold from a roller conveyor onto the machine.

Abstract: A press system that provides rapid advance of one platen on a movable crosshead through the use of programmed hydraulic controls and is specifically adapted for use with sheet molding compound (SMC) presses. Rapid locking or latching of the crosshead and the platen it carries is achieved through the use of hydraulically operated clamping and release cylinders. The lower platen is supported on hydrostatic bearings permitting the platen to move and at the same time parallelism of the mold halves is maintained by swiveling molding power cylinders. Separate push-back cylinders are used to separate the mold through a short load path so that when the mold "breaks away" there is very little springback to minimize any part breakage during mold stripping.The lower platen also includes a mounting arrangement that provides the advantages of a rolling bolster or lower platen with a minimum of mounting structure.

Abstract: A pipe die for an underwater pelletizer is provided in which a nozzle plate is provided on the surface of a pipe die, the nozzle plate having a hole coaxially with and of the same diameter as a pipe of the pipe die. The nozzle plate is made of a material of the same quality as the die body and is provided with a hardened layer at its cutter side surface. Replacement and repair of the nozzle plate is improved by connecting the same to said die body by bonding the whole junction plane therebetween.

Abstract: An adjustable extrusion die assembly forming part of an extruder for an elastic material, comprises: a stationary die member having an end surface; a plurality of movable die members positioned in side-by-side relationship to one another and slidably contacted with one another, the movable die members respectively having end surfaces opposing to and spaced apart from the end surface of the stationary member, the end surfaces of the stationary and movable die members defining in combination an extrusion opening through which the elastic material is to be extruded, the movable die members being individually movable toward and away from the end surface of the stationary die member with respect to one another so as to vary the distances between the end surface of the stationary die member and the end surfaces of the movable die members; a guide member having formed therein a guide slit having the movable die members guided therein; and a plurality of link members each interconnecting two adjacent movable die memb

Abstract: A rotatable mandrel for making cylindrical molded articles has a plurality of aligned identical and collapsible cylindrical mandrel sections supported upon a cantilevered shaft, the cylindrical sections having a truss supported relatively thin exterior wall and retractable segment to permit circumferential contraction of the wall, the composite segmental cylindrical segment being supported by a central cantilevered rotatable shaft in turn supported by a rotatable bearing assembly on a vertical support tower, the collapsible contraction of the composite cylindrical mandrel being controlled by internally mounted power units connected to the retractable segment and the other portions of the cylindrical mandrel sections.

Abstract: This invention concerns a metal mold for the manufacture of a vulcanized reinforced hose by the compression and vulcanization of an unvulcanized hose in the cavity of the metal mold. This metal mold comprises a movable piece, a stationary piece, and a pair of inner pieces disposed between the movable piece and the stationary piece. The movable piece, the stationary piece, and the pair of inner pieces are severally provided at the inner sides thereof with depressions corresponding to the four equal parts into which the inner surface of the cavity of the metal mold is radially divided so that when the metal mold is closed, the pair of inner pieces are synchronously moved with the movable piece and the stationary piece in the direction of compressing the unvulcanized hose.

Abstract: Crosslinkable polymers and co-polymers are treated with boric acid, boric acid anhydride, or mixtures thereof prior to crosslinking with free radical organic peroxide initiators in the presence of oxygen. This pre-treatment prevents stickiness of the surface of the crosslinked polymer making the crosslinked polymer more commercially acceptable.