Abstract: A device for cutting off a sprue of a parison with a bottom is capable of cutting off the sprue in a heating furnace. Cutter plates for cutting the sprue and an outlet for discharging the cut sprue are disposed at the bottom of the heating furnace. Cutting off the sprue may thus be performed without changing the usual molding cycle of the hot parison molding method. The device may alternatively be applied to the cold parison molding method.

Abstract: The cavity surface of a foam mold is sprayed with a paint which becomes integrally bonded to the outer surface of the foam molded part. The sprayed paint unavoidably overlaps the parting faces of the mold around the outer edges of the mold cavity. In order to avoid the necessity of trimming a paint flash from the molded part along a line corresponding to the parting line of the mold, after the cavity is spray painted and while the paint is still wet the line of intersection between the cavity and the parting faces of the mold is contacted with a member which interrupts the continuity of the paint film. This avoids the formation of the paint flash on the molded part.

Abstract: Apparatus and method for rapidly removing fuzz from about the edges of sheets of material and apertures within those sheets without damaging the sheet material performed by passing the sheet quickly through a flame.

Abstract: A molding tool including an edge-sealing profile designed to bind the surface section of a molded article which is not to be coated, and which is integral with the surface of the molding tool that is under compression when the tool is closed.

Abstract: Apparatus for separating pendent tail scrap from the bottoms of containers advanced continuously in series by exerting a tensile force between each advancing container and the pendent tail. Each container is advanced with its pendent tail extending through a slot in a conveyor, and counter rotation rollers grip and pull the tail to cause the separation. A method of operation includes advancing a series of containers and progressively gripping the flash of each advancing container from the leading edge to the trailing edge thereof, and pulling the flash simultaneously as the gripping occurs to cause separation of the flash from the leading to the trailing edge thereof by exertion of tensile force applied between the tail and the bottom of the container.

Abstract: An apparatus and method for mounting thermoplastic materials directly upon a string medium. A hot runner system or three-plate mold provides the cavities for integrating the molten thermoplastic material and string medium. Molten thermoplastic is injected at a plurality of input apertures along a bifurcated mold, the bifurcated mold having complementary cavities joined by subrunners to transmit the molten thermoplastic material into each cavity. Each cavity is adapted to form a member which is to be permanently affixed on the string medium and includes aligned channels for receiving the stringed medium prior to injection of the molten thermoplastic material. The stringed medium is disposed within the channels prior to injection of the molten thermoplastic material. Under appropriate temperature and pressure conditions, the injected thermoplastic runner flows into subrunners filling each cavity of the bifurcated mold, thermoplastic bodies forming about the stringed medium in a permanent manner.

Abstract: An apparatus and method for automatically removing flash from a plastic weld bead formed around the outer periphery of a heat seal juncture between a plastic cover and container of a lead-acid battery cell. The container and cover are automatically positioned with respect to a first set of spaced, heated platens, which are then driven laterally across a first pair of opposed surfaces of the cell along the weld beads formed on these surfaces. The cell is then automatically positioned with respect to a second set of spaced, heated platens, which are then driven longitudinally across a second pair of opposed surfaces of the cell along the weld beads on these surfaces, whereupon the cell is automatically removed.

Abstract: In the manufacture of extra thin walled plastic containers the tail flash formed during the molding operation is spaced from the container proper by molding one or more standoff projections into the flash. This maintains the tail flash in an appropriate relationship relative to the container until it can be severed by a shearing mechanism. The projections are formed in the tail flash by providing male and female projection elements in the mold. In the absence of such standoffs, the tail flash will come in contact with the container while still sufficiently hot enough to adhere thereto.

Abstract: A rotary blow molding machine includes a rotor mounted on a horizontal driving shaft, a recovery hopper, an ejector mechanism, and mold stations mounted on the outer periphery of the rotor, which mold stations are radially disposed and circumferentially equally spaced, the mold stations each carrying thereon a split mold unit capable of opening and closing in the direction of the width of the outer peripheral surface of the rotor by a mold opening/closing mechanism, a mold clamping mechanism and a flash blow-pipe, the said split mold unit having a mold-release mechanism. It is so constructed as to produce blow moldings successively continuously at high speed and completely automatically during a single rotation of the mold stations on and along the same circular rotation track.

Abstract: A mold comprising a pair of mold sections which when closed form separate communicating chambers for receiving a component body and a portion of a non-axial lead extending from the component body. Molten plastic introduced into the mold encapsulates the capacitor body while the plastic which surrounds the lead portion is readily detached from the lead portion.

Abstract: A mold comprising a pair of mold sections which when closed form separate communicating chambers for receiving a component body and a portion of a non-axial lead extending from the component body at an angle to the axis of the body. Molten plastic introduced into the mold encapsulates the capacitor body while the plastic which surrounds the lead portion is readily detached from the lead portion.

Abstract: A mold for manufacturing silicone contact lenses is provided. The mold comprises a male section and a female section plated with chromium or nickel which when joined together come into contact with each other only at a portion at which the mold surface of one section becomes continuous with that of the other section to define a cavity therebetween. The contact between both sections is not in a flat-to-flat fashion but in a line or edge-to-edge fashion so that a contact lens whose surface and edge are completely freed from flashes or irregularities can be obtained. Further, with the use of chromium or nickel plated mold of the present invention, a contact lens of excellent quality can be obtained from a silicone resin which is affinitive to chromium and nickel.

Abstract: The present invention is a tool used for removing the cooled flash from rubber articles and is constituted by conventional brushes arranged rotatably across the movement of a belt. These brushes are mounted on shafts which are secured in rotatable discs arranged on both sides of the workpiece holding zone.

Abstract: A method is provided for removing and finishing blown hollow articles made of plastic in machines for manufacturing blown plastic articles of the type which is provided with at least one blow mold closing unit movable between a hose transfer position, in which position the blow mold closing unit receives plastic hose pieces, and a removal position, in which hose pieces are blown into a hollow article having a calibrated opening and with at least one finishing station for the blown hollow articles. The process is characterized in that the hollow article on its path from the mold closing unit to the finishing station is alternately gripped by internal gripping members and external clamping members which maintain the hollow articles in a stable position during its entire travel through the machine.

Abstract: A one piece molded synthetic organic resin structure including a base and an arm connected thereto at spaced apart points by thin struts easily severed to separate the arm from the base. Connection means are provided on the arm and the base so that one end of the arm can be fixedly connected to the base leaving a free end of the arm overlying a portion of the base, the free end normally being urged against and in contact with the base. The arm is sufficiently flexible to permit the free end to be bent away from the base without breaking the arm, the release of the arm resulting in a snap movement thereof against the base causing a loud noise.

Abstract: In the manufacture of oriented hollow articles made of thermoplastic material by the steps of extruding a continuous hot tubular parison of thermoplastic material; pre-blowing such parison in a pre-blowing mold to produce preforms having a cylindrical body with a diameter not more than 20% greater than that of the parison; thermally conditioning the resulting preforms at a temperature sufficient to cause orientation of the thermoplastic material when it is being stretched; and effecting a final blow-molding of the thermally conditioned preforms, the mechanical properties of the resulting articles in the vicinity of their base are improved by carrying out the pre-blowing step while holding each parison tightly between two half-molds defining a cavity which has the shape, at the location of the base of the preform, of a quarter sphere of diameter equal to that of the preform, and cutting off the resulting flash by means on an elongated blade having a semicircular cross section and a diameter corresponding to th

Abstract: Apparatus for removing tail flash from molded plastic articles, such as containers or bottles, in which a pair of reciprocatory jaw assemblies are formed with meshing teeth which engage the flash from opposite sides and subsequently tear the flash from the article. The jaw assemblies are formed with meshing tooth-like projections which engage flash from opposite sides at spaced locations along the line of juncture between the web of flash and the surface of the article. Inclined cam surfaces on one jaw assembly urge a flash web engaged between the teeth of the closing jaws outwardly away from the article to tear the flash clear of the article.

Abstract: Apparatus for simultaneously molding a plurality of bottles, and removing flash tails from the bottom of all of the bottles prior to removal from the mold includes a die having a plurality of cavities therein corresponding to the shape of the bottle to be molded. The die includes a plurality of concavities along an outer surface thereof, each next adjacent one of the cavities. A shaft is rotatably supported immediately adjacent this outer surface of the die, and extends substantially parallel with the row of cavities, the shaft further including a flat surface immediately adjacent each concavity along the outer surface. A blade is mounted on each flat surface, each blade having a greater dimension between the shaft and the second portion of the cutting edge with respect to the dimension between the shaft and an outer extremity of the cutting edge.

Abstract: Annular surplus material which is separated from a parison section in the cavity of a blow mold in response to penetration of a blowing mandrel into the neck mold of the blow mold in a blow molding apparatus is stripped off the mandrel during the last stage of movement of the mandrel to an upper end position and subsequent to complete opening of the blow mold so as to allow a freshly formed plastic container to descend by gravity and to move sideways out of alignment with the mandrel. The mandrel has a cylindrical calibrating portion which cooperates with the neck mold to press mold the neck portion of the container prior to blowing, and a smaller-diameter lower end portion which guides the container during the initial stage of gravitational descent onto a conveyor or into a receptacle.

Abstract: An apparatus is disclosed for demoiling hollow, blown, plastic articles. The apparatus features a holding assembly for holding the article so that movement of the article along its center axis is prevented, a moil gripping assembly which grips the moil, and a power mechanism for moving the moil gripping assembly away from the article and thus removing the moil from the article.

Abstract: This invention relates to an apparatus for extracting blown plastic articles from split blow molds and for precisely placing the extracted article at a receiving point such as on a moving conveyor belt. The apparatus includes a gripping mechanism for gripping the article, means for moving the gripping mechanism to and from the article, means for arcuately moving the gripping mechanism and gripping actuator means to cause the gripping mechanism to grip and release the article when desired.