Abstract: Wet pellets of carbon black are dried to produce dry pellets by means of a two-step process. In the first step a bed of wet pellets is fluidized by means of a heated gas and the pellets are thus partially dried. In the second step the partially dried pellets from the first step are subjected to additional drying while in a nonfluidized state, e.g. pellets from the fluidized bed are heated and subjected to a mild, mechanically produced tumbling action during the second step.
Abstract: An improved mass production assembly line is provided for fabricating building walls and similar structural members in molds by applying a hardenable polyester film to the cavity surfaces of mold halves, joining the mold halves and then introducing a mixture into the mold cavity to form a polyurethane foam.First and second rectangular fields of rollers, each mounted on a pedestal, are adapted to carry respective mating halves of each mold in a horizontal plane from a start end of the fields to the terminating end. The mold cavities face upwardly. The lower surface of each mold half has secured thereto elongated T-shaped bars. The bars are parallel with each other, and each bar is adapted to be carried by one line of rollers in a respective one of the fields. The parallel axes of the rollers are set to an exact height by means of a laser light source and photoresponsive means so that the upper edges of the rollers lie in the same horizontal plane.
Abstract: Mold apparatus for vacuum forming sheet material, especially sheet plastic, including withdrawable projections which project into the mold cavities to form depressions or projections in the resulting molded item and are withdrawable to allow removal of the molded item. Sealing means, such as an "O" ring, on each projection, are included to prevent loss of vacuum through the mold walls around the projections. Counter-rotational camming means are provided for simultaneously projecting or withdrawing a plurality of the said projections either on one mold or on adjacent molds.
Abstract: This invention relates to an improved self-centering bottom block assembly for D.C. casting. The assembly comprises a bottom block which is slidably mounted on a supporting surface and which is provided with at least two guide extensions. Positioned below the D.C. mold are at least two recessed guide surfaces, the lower portion of which converges in the direction of the discharge end of the mold. The horizontal and rotational movement of the bottom block is restricted so as to ensure the insertion of the guide extensions into the recess defined by the guide surfaces and thereby guide the bottom block into the mold bore without contacting the mold body.
Abstract: Apparatus for fabricating a cellular laminated material from two plastic sheets includes a molding rotatable cylinder in contact with a pressure rotatable cylinder. Cooling water injection and air removal are accomplished within the interior of the molding cylinder. The contact portion of the two cylinders receives one of the plastic sheets. The other plastic sheet is cooled, heated and stretched prior to its being fed for embossing and laminating with the other plastic sheet on the molding cylinder. One embodiment has ends on the molding cylinder to provide an air-tight enclosure and the other embodiment is open at the ends thereof.
Abstract: An apparatus for the production of extruded profiles of foamed thermoplasts consisting of an extruder having an extrusion screw or helix and a form-giving extruder head having a flow channel there-through, at least part of the length of said flow channel being divided by separating walls having a thickness of 0.2 to 3 mm arranged in the axial direction into individual channels of such a length and cross-section area whereby each individual channel has a nozzle coefficient k of from 0.1 to 2mm.sup.3, characterized in that thorn-like pins are inserted into some of the individual channels; as well as the process of extrusion.
Abstract: Method and apparatus for forming boards and slats by consolidation of a mat of individual elongated fibers and particles which are preliminarily aligned or oriented in the same direction by free-fall through an electric field in order to achieve the desired physical properties such as stiffness, strength, and dimensional stability in the grain direction.
Abstract: A molding device including a rigid container defining a molding chamber and a mating collapsible member with walls and a floor and of a normal size and shape to mate in the rigid container and define a molding space between the container and the collapsible member; the collapsible member includes means to collapse it through a first stage of movement of withdrawal of the walls inwardly from a molded object and a second stage of movement of withdrawal of the floor axially upwardly away from the container and a molded object.
Abstract: A continuous casting method for the production of a casting having a solidified metallic structure which is nearly all composed of equiaxed crystal uniformly distributed, by agitating the crater of the cast object during the process of solidification by applying a travelling electromagnetic field to an extent sufficient to make the velocity vector of the main flow of the agitated molten metal present in the plane perpendicular to the direction of withdrawing the cast object and to confine the entire flow in such crater within the limited agitation zone, and an apparatus for carrying out the method.
Abstract: A mass of a hardenable synthetic resin such as polyurethatne is introduced into a mold cavity and is allowed to harden at least partially. Thereafter a piston having a face contiguous with an inside surface of the cavity is retracted away from the hardened mass in a bore formed in one of the mold halves. The mold is then opened and a gas is fed into the bore at a location between the retracted piston and the mass so as to pneumatically eject the hardened mass from the mold. The piston is formed with a plurality of circumferential grooves adjacent its face, these grooves filling with synthetic-resin material during use so as to form a seal around the piston. A pair of orifices open into the bore of this piston; one of the orifices is connected the source of pressurized gas, the other is connected to a passage opening into the atmosphere.
Abstract: This invention relates to an apparatus for high intensity shear refining of soap in a soap extruder including at least one rotating auger in a housing for high intensity shear mixing of a mass soap ranging from 3,000 to 40,000 shear cuts per minute, the auger including a shank having a plurality of flights and kneader blocks. The soap extruder includes a housing having a barrel bore for receiving said auger with said auger terminating short of said bore to form a free space, an extrusion outlet extending from said bore, a nozzle plate is secured to said housing in alignment with said extrusion outlet. The nozzle plate has at least one inwardly tapering aperture of lesser diameter than that of said extrusion outlet.
Abstract: The temperature profile established across a heat exchanger, such as employed on an extrusion die, for example, is controlled by introducing fluid into the heat exchanger at a predetermined temperature. The temperature of the fluid withdrawn from the heat exchanger is measured, and the rate of flow of fluid through the heat exchanger is controlled in response to the measured temperature to maintain the measured temperature at a predetermined value.
Abstract: The invention is a drive mechanism for a rotary vacuum forming multifaced drum to essentially match the surface speed of said drum to the constant speed of a web of film issuing from a film die. The instant invention provides apparatus to continuously vary the rotational speed of a multifaced vacuum forming drum with any number of faces, such that if a web of hot film were extruded at a constant rate, the rotational speed of the drum would vary as required to accept the film at a constant rate to provide an essentially uniform thickness of material on the surface of the drum for thermoforming.
Abstract: This invention relates to an improved bottom block design for the D.C. casting of large aluminum rolling ingots wherein vertical extending, pyramid shaped projections are provided at the corners of the generally rectangularly shaped bottom block. Significant reductions in dish-shaped butt cracks and corner cold folds are found with the present design.
Abstract: A spinning unit for spinning fiber-forming polymers having a high pressure pump mounted on a pump base, and an interconnecting nozzle unit disposed adjacent said pump base within an insulated housing. A draw spindle threaded at one end and having a shoulder spaced from the threaded end, secures the pump base to the nozzle unit, the latter having a threaded opening to receive the threaded end of the spindle, the pump base having a wall against which said shoulder abuts to put the spindle in tension as it is tightened into said threaded opening.
Abstract: Method and apparatus for the intermittent manufacture of multi-layer molded bodies of thermoplastic material with a foamed core and an unfoamed shell, wherein a strand of a nonfoaming plastic of ring-shaped cross-section enclosing a strand of plastic containing a foaming agent is injected into a mold.
Abstract: A method is provided for preventing orifice plugging when melt extruding a steel-titanium alloy to form fine diameter wire. This is accomplished by controlling the oxygen potential in the melt above the orifice at a level wherein the activity of titania within the melt is maintained at from 0.3 to unity -- the standard state of unit activity being defined as the melt saturated in titania at the concentrations of titanium and oxygen therein and at the melt temperature.
Abstract: Plastic extruding and roll forming apparatus having a connecting passage at least partially formed by a plate which is swingable between open and closed position to conduct material from an extruder to forming rolls and to provide access and/or to release excess material in the passage. The extrusion and forming rates are controlled by the movement of the plate.
Abstract: Flow conditions in an extrusion head in a cross head type extrusion apparatus for applying a concentric plastic insulating covering uniformly around a longitudinally advancing filamentary core advancing axially through a die concentrically disposed in an extrusion chamber in the head, are improved by providing channeled tooling within the chamber which bends and divides an initial stream of plastic material forced into the chamber into a plurality of equal streams which combine symmetrically around the core. With respect to certain channels, the ratio of the length of the channel to its effective cross-sectional diameter exceeds a predetermined critical number to achieve the development of steady state fluid flow therein.
Abstract: The invention relates to an apparatus and process for producing striated soap bars using a high intensity mixer extruder. A soap mass is levigated and homogenized in a high intensity mixer barrel and forced into a dye injection assembly wherein dye is injected into the soap mass. The soap mass with the injected dye is then forced through conically tapered nozzles to form a striated soap bar.