Abstract: A method of sealably encapsulating an article by using, in combination, a plastics heating and pressurizing device and a manually portable accumulator. The device has a chamber to contain plastics material and heat it into a molten state. There is a releasable coupling means to assemble the device and container together to interconnect the chamber with a reservoir inside the accumulator for transfer of the molten plastic material into the reservoir. The accumulator has means for forcing the molten material from the reservoir into a mold cavity when the accumulator has been manually transferred from the device to a mold.

Abstract: A press control system for presses fitted with floating platens or tools employs hydraulic cylinders and a spring loaded accumulator to bias the floating element against position change on press closure. The hydraulic pressure in the bias system is compared with floating element position to detect abnormal pressure-position relationships.

Abstract: Hydraulic press including a frame with platens, at least one of which is carried or formed by a pressure plate structure adapted for transferring pressing force to an object between the platens, which press is adapted such that the pressure plate structure is substantially carried solely by horizontally adjustable supports mounted between the defining outer edges of such plate structure, such supports being positionally adjustable such that the surface of the corresponding platen assumes a predetermined shape during the pressing operation. The press suitably includes a mechanical mechanism for effecting the horizontal displacement in order to gain the desired positional adjustment of the supports.

Abstract: An extruder for a fluid material including a cartridge containing a fluid material, and pushing members for pushing an end of the cartridge so as to extrude the fluid material. The pushing members are arranged to be driven by a system of a pinion and racks put in motion through reduction gears.

Abstract: The invention pertains to a system for dispensing tacky thermoplastic material such as butyl, and the like, and includes encasing a strip of the tacky material within a thin, non-tacky thermoplastic film capable of fluxing into the material at elevated temperatures wherein the material may be wound upon a spool for transportation and handling, and the material is fed from a spool into mixing and heating apparatus, preferably in the form of an extrusion gun, for application where desired as a bead.

Abstract: An object is produced from a tubular blank (10,15,17) of thermoplastic material of polyester or polyamide, preferably of polyethylene terephthalate by reducing the thickness of amorphous material in one or several areas of the blank by means of one or several consecutive re-shaping operations. A mechanical shaping device (23,29,71,81) moves a transitional zone (13,14,113) situated between thicker and thinner material along the blank and simultaneously elongates the blank in the moving direction of the transitional zone while reducing the thickness. After the last re-shaping operation the thinner material preferably has an oriented state. During the re-shaping operation the temperature of the material in the transitional zone (13,14,113) is controlled at a level which, immediately before the re-shaping operation, is within or close to the range of the glass transition temperature (TG).

Abstract: A method and apparatus for loading an array of articles into a front loading molding press. Two pairs of rails and two carriages are utilized to facilitate the various loading movements. The first or lower pair of rails is fixed and slidably mounts the first or lower carriage. The second or upper pair of rails is defined on the lower carriage and slidably mounts the upper carriage. A loading board is carried on the upper carriage and is mounted for up and down movement relative to the upper carriage. A predetermined array of loading heads are positioned on the underside of the loading board and a predetermined array of article holders are positioned between the forward portions of the lower pair of rails.

Abstract: The mold halves of a blow mold device are mounted on a pair of arms encircling the mold halves in a semicircular arc which arms are latched together by latching means which are located at the parting line of the mold halves at both sides thereof. Due to this structure, merely the portion of the arms extending between said latching means is subjected to bending forces by the blowing pressure. For swinging the arms and actuating the latching means a common slide is provided in parallel relationship to the longitudinal axis of the blow mold, which slide includes a number of control cams which are engaged by cam followers cooperating with said arms and said latching means. The invention provides a compact and light-weight construction allowing to actuate a smaller mass in shorter time, thus increasing the production capacity of the blow mold device.

Abstract: An apparatus and method for loading a front loading molding press in which a loading board is pivoted at one edge on a horizontal pivot shaft which extends into a lower corner of the press opening adjacent one side of the mold in the press. Loading of the press is performed by loading the board with a predetermined array of articles to be molded while the board is in an upwardly pivoted oblique preloading position to one side of the press opening; thereafter pivoting the loaded board downwardly to a loading position directly in front of the press; thereafter sliding the board on the pivot shaft into the press opening to an unloading position directly overlying the mold; and thereafter discharging the articles downwardly onto the mold.

Abstract: A die assembly for extruding multilayer parisons which is excellent in controlling the respective thicknesses of the resin layers of parisons and comprises a parison programming shaft; a core pin which is attached to the lowermost end of the parison programming shaft; a mandrel which encircles the parison programming shaft; a plurality of control rings which are mounted on the mandrel; a plurality of sleeves which are installed around the mandrel; a housing which holds the above members; a controlling member to control the resin quantity of the outer layer of parisons; a die supporting member; and a die; and characterized in that the resin passage of the die assembly is regulated by each of the control ring together with an annular rib that is formed on the inner wall of the sleeve; by the controlling member together with the lowermost sleeve; and by the die together with the core pin.

Abstract: A spinnerette for mesophase pitch includes a spinnerette body with a plurality of mesophase pitch fiber forming channels through it. Each bore includes a capillary bore section at the outlet side of the spinnerette body, a wider diameter counter bore at the inlet side and an entrance between the wider bore and capillary bore sections with the entrance wall defining a relatively flat angle for increasing the proportion of tangential cross-section pitch fibers, as compared with radial cross-section fibers.

Abstract: A mold comprising a core which is open at one end and has the negative contour of the workpiece and a sheet-metal outer container surrounding the core. High dimensional stability of the core, easy removability of the workpiece from the mold and a smoother surface of the workpiece are obtained by isostatic pressing of titanium powder in the spaces in the mold. The core consists, at least at its negative contour surface for the workpiece, of a high-temperature alloy, particularly one having a base of nickel or iron. This and the titanium powder material of the workpiece are neutral in chemical reaction and low in or free of diffusion with respect to each other upon the hot isostatic pressing. The core is in the form of a ring of segments surrounded by a solid holding ring.

Abstract: Apparatus and method for compensating uneven gravity filling with powder material of a die cavity formed on the top of a punch reciprocable in a bore in a die plate, the punch having an end face normally parallel to the surface of the die plate. The punch is mounted on an adjustable support member split into portions having each an end face disposed parallel to the end face of the other portion. The two portions have a common surface of junction disposed in a plane at an angle to the parallel end faces. The two portions are rotated together to orient the surface of junction in the direction of inclination of the punch, and the two portions are independently rotated the same amount in opposite directions as a function of the desired angle of inclination of the punch.

Abstract: A positive pressure dough divider comprising a hopper (14) for dough, and a pair of rotatable sheeting rolls (15) which carry the dough from said hopper (14) into a transfer passage (16) leading to a volumetric measuring chamber (28) inside a rotating body (27) which is adapted to stop or rotate for periods at reduced speed, such that, while the measuring chamber (28) is being charged with dough from the said rolls (15), a maximum possible charging time is provided, and to move at greater speeds at other times to provide minimum possible delay between charging operations. The rolls (15) are of sufficiently large diameter, and rotate in opposite directions at such a speed, as to produce or maintain a dough of good gas retaining properties while providing a positive pressure rise along the direction of flow in the passage between the rolls sufficient to charge the measuring chamber or chambers.

Abstract: A device suitable for molding ophthalmic lenses comprises two spaced mold parts in face-to-face relationship inside a cylindrical sleeve. One or both parts comprise a rigid supporting base, a molding die of an elastically deformable material and an intermediate pad of an incompressible elastic material disposed between the base and the die and completely covering their respective surfaces.

Abstract: A staple-fiber band is made by first spinning synthetic-resin filaments with spinnerets and drawing the filaments as roving at a predetermined feed speed from the spinnerets. The roving is then cooled without greatly stretching it so it has relatively high residual stretch and is then stored. Without intermediate treatment the roving is heated to a predetermined temperature and then stretched it to a relatively small residual stretch. The stretched roving is then thermofixed and then stretch-torn. Finally it is textured. During the heating, thermofixing, stretch-tearing, and texturing steps the roving is held under tension so that its filaments cannot tangle. When the filaments are of polyester they are stretched at between 60.degree. C. and 120.degree. C. and thermofixed at a temperature that can be somewhat higher.

Abstract: Apparatus for cutting thermoplastic filaments or rods with multiple blades in a granulation head of the type which is completely immersed in a cooling liquid, the blades acting with an extrusion die having extrusion orifices arranged in one or more rings centered on the axis of the die and coaxial with a rotary cutting means carrying cutting blades, wherein the cutting blades have an extrados surface inscribed within a regular convex polygon having an apex angle of 7.degree. or less and an intrados surface having a point of inflection situated at a distance between one quarter and one half of the width of the blade, the remainder of the intrados beyond the inflection point having a profile pattern similar to that of the extrados, and methods for chopping thermoplastics with such apparatus.

Abstract: A quick change locator wedge clamp assembly for a plastic molding machine ving opposed stationary and movable platens adapted to receive, mount and support a sectional die having stationary and movable clamp plates which comprises laterally spaced pairs of opposed locator wedge clamp assemblies mounted upon and projecting from the platens. Similarly spaced pairs of opposed wedge clamp guides are mounted upon the clamp plates on one side of the molding die and have similarly spaced opposed pairs of locator slots. Each clamp assembly includes a locator key mounted upon a platen of a shape to snugly receive the corresponding wedge ramp slot for locating the molding die in a predetermined position relative to the platen. A wedge is yieldably mounted upon and extends transversely of a key and has a tapered undersurface adapted for operative retaining engagement with the adjacent wedge ramp guide.

Abstract: A nozzle assembly for extruding a tube has an outer housing sleeve having an inner surface centered on an axis and having an axially forwardly directed front end and a core formed of attached-together front, intermediate, and rear core ports. The front core part lies within the sleeve at the front end thereof and forms with the inner housing surface an annular axially forwardly open extrusion passage. The intermediate core part lies within the sleeve axially behind the front core part and is formed with a pair of grooves opening radially outward into the passage and each defined by a respective annular rear face extending generally perpendicular to the axis, a respective annular front face confronting the rear face and extending generally perpendicular to the axis, and a heart-shaped annular surface axially bridging the respective faces, facing radially forward, and having a portion forming a radially forwardly directed point.

Abstract: In molding of plastic materials, particularly thermoset compounds, venting of dies is essential to obtain well molded parts, and this invention discloses improved venting of dies in molding of thermoset plastic compounds wherein a vent path 4 vents from the die into a vent well 3, said vent well comprises a wedge shape having a transition angle of 10.degree. to 35.degree. and a vent extension 6 extending from said vent well 3, to the atmosphere.