Abstract: A method of and means of winding close wound helical coils of a thermoplastic monofilament material is proposed wherein, in order to avoid secondary twist in the resultant coil, the coil, after having been wound and heat set under controlled conditions on a first part of a mandrel, is twisted in a direction tending to close the individual turns of the coil during the cooling thereof while passing along and/or from the end of a second part of the mandrel to a twist arresting means arranged in spaced apart disposition relative to such end.

Abstract: Process for forming optically clear lenses or artifical corneas from a reaction product of 4,4' dicyclohexylmethane diisocyanate, polytetramethylene ether glycol and ethylene oxide-capped trimethylol propane. The resulting polyurethane is optically clear and suitable for use as an artificial cornea, or a permanently implantable lens.

Abstract: Molded product and method for providing a desired surface-hardness for its surface by means of a simple molding technique through several steps comprising the cutting of a thermoplastic film or sheet to the same form as the exterior form of the product, the placing of the cut piece on a mold-cavity surface, and the injecting of a molten resin for formation of the product into the mold cavity under a high pressure. The thermoplastic film or sheet is subjected, in advance, to a hard-coating treatment on its surface and a curing treatment to cure the agent thereon thereby forming a hard-coating layer on the surface of the product.

Abstract: A lens barrel assembly consisting essentially of a first and second barrel member having helicoid screw threads therebetween which enable said barrel members to be moved axially upon relative rotation therebetween is formed in a molding process wherein one of said barrel members is utilized as a mold element in the formation of the other barrel member with the other barrel member being formed by injection molding of resin material injected into a cavity defined at least in part by the first barrel member. The lens barrel assembly is formed with the barrel members in operative juxtaposition when they are removed from the mold cavity.

Abstract: Vibration isolators are manufactured by a co-injection molding process. Outer and inner parts of the isolators are molded first from a rigid or stiff thermoplastic material such as polystyrene and intermediate spring-like parts of the isolators are made of a thermoplastic elastomer such as copolymer of butadiene and styrene formed and bonded to the outer and inner parts in a subsequent molding step.

Abstract: For over-molding a thermo-plastic material on a connector, the connector is, at the outlet of the machine having crimped the connector on a conductor, carried into a gripper maintaining the connector when introducting a core mounted on a conveyor. The connector is then carried into an injection mold from which it is extracted before complete cooling, to be carried to a cooling station comprising a mold similar to that of the injection mold but being at a lower temperature.

Abstract: The invention relates to a fabrication process for molding a contact lens evincing the required optical properties.This method consists in designing a mold (1,2) with a high thermal inertia, transparent to, or little absorbing electromagnetic waves with wavelengths between 1 micron and 10.sup.-6 microns, in developing a base composition from polymerizing double-bond monomers which are absorbing with respect to these waves and in securing the polymerization of the composition inside the closed mold by irradiating with the above-cited electromagnetic waves at a power density such as to keep the temperature approximately less than 40.degree. C. at the mold level.

Abstract: A controlled dielectric barrier is created surrounding a fastener to isolate its sparking areas. The barrier is formed by creating a cap to define a desired cavity between the cap and the fastener and then dielectric isolation material is placed in the cavity and held in place by the cap until hardened. The cap may then be removed from the fastener as desired.

Abstract: In a sealed system, a polymerization initiator and a chain transfer agent are added to a methyl methacrylate monomer distilled under reduced pressure condition via a distillation step of the former both ingredients, the methyl methacrylate monomer is successively polymerized to prepare a core polymer while maintaining the reduced pressure condition, then the resulting core polymer is subjected to melt spinning to form a core fiber while maintaining the sealed system, and a clad of a macromolecular compound having a refractive index lower than that of the aforesaid core fiber is adhered around the periphery thereof, whereby a low-loss plastic optical fiber with excellent optical transmission characteristics having a core-cladding structure is fabricated. Plastic optical fibers so made exhibit light attenuation as low as 60 dB/km or lower.

Abstract: A process for embossing flexible polymeric substrates in a dielectric heating press having a platen and a design fixture by placing an insulating blanket of a composite sheet structure between the substrate being embossed and the platen of the press and embossing the substrate; wherein the composite sheet structure is an aromatic polyamide fabric coated on both sides with a 2-30 mil thick layer of a fluorosilicone rubber and having a dielectric constant of about 4-8 and a dissipation factor of about 0.015-0.030; the polymeric substrates generally are laminates of thermoplastic polyurethane form/short napped synthetic velour fabric used as upholstery for automobiles and trucks.

Abstract: In terminating a ribbon which comprises an array of lightguide fibers, a substrate having a plurality of parallel grooves is positioned in a nest and supported at its end portions after which an end portion of the ribbon is moved longitudinally to cause the fibers to be separated by a comb-like device adjacent one end of the nest after which the ribbon is secured with a clamp adjacent the other end of the nest. Another substrate having aligned grooves is placed over the fibers so that the fibers are held in channels formed by the opposing grooves after which the assembly of substrates and fibers are secured together with a temporary clamp which applies compressive forces to end portions of the assembly along a longitudinal centerline of the assembly. Then a vise which includes jaws having parallel surfaces for engaging the substrate is moved toward the assembly to position a lower jaw under the lower substrate and an upper jaw above the upper substrate.

Abstract: A process is described for the production of biaxially stretched and embossed polyvinyl chloride film, in which a polyvinyl chloride film is first stretched biaxially at specific stretching ratios and, immediately after being stretched, is embossed under specific conditions. The film produced by this process is employed with particular advantage as base film for adhesive tapes.

Abstract: Press for powder metallurgy and method of simultaneous compression of powder in a die disclosed which includes descent speed differentially control apparatuses for simultaneous compression powder in the die from both the upper and lower direction by an upper punch and a lower punch. The descent speed of an upper ram is transferred to the upper punch at that speed, and the speed is changed to lower speed through the control device than the upper punch speed and the controlled lower speed is transferred to a die holder which is simultaneously descended with the controlled lower speed together with the high speed upper punch.

Abstract: Apparatus for forming, compacting and finishing the top surface of concrete poured between a pair of removable longitudinally extending parallel opposed forms. The apparatus, which is self-propelled, travels along the tops of the forms. A heavy wooden vibrator member disposed at the forward end of the apparatus may be shaped so that concrete beneath the vibrator is formed and compacted to a depth which varies along transverse axes of the forms. The structural members of the apparatus may be interchanged or adjusted to adapt the apparatus for use with forms of arbitrary spacing. Simple adjustments may also be made to permit the apparatus to traverse forms of unequal height. Removable "skirts" enable use of the apparatus with relatively narrow forms supported above the grade on which the concrete segment is formed--the skirts serve as a "travelling form" to prevent poured concrete formed and compacted by the vibrator spilling beneath the forms.

Abstract: A method of manufacturing insulated electric wire of the enamelled-wire type wherein an insulating sheath adhering to the wire is formed by extrusion of selected thermoplastics which are heated to a temperature above their melting-point, then pressed onto the wire while in a fluid state. The extrusion apparatus includes a gauging die with a compressing cone having an aperture angle of from 2.degree. to 20.degree., preferably 7.degree..

Abstract: A piston rubber with a body of substantially cylindrical exterior shape with one end thereof reinforced with a textile fabric wound into a roll that is arranged generally coaxial with the cylindrical body. The method for making the piston rubber involves winding a length of rubberized fabric around a mandrel and forming a sleeve of desired radial thickness, cutting the sleeve into bands of desired widths, and placing the bands and elastomeric material in a mold and curing the same to define a piston rubber.

Abstract: Film of a wholly aromatic polyamide, at least 85% of the repeating units of which are meta-phenylene isophthalamide units, which is undrawn and noncrystalline and which has improved impact strength. Such film is made by heat-treating film of the polyamide which is undrawn and noncrystalline at 400.degree. to 300.degree. C. for from 2 seconds to 2 minutes while maintaining the film at constant length and width permitting it to shrink by at most 20% in each of the length and width.

Abstract: A polyimide semipermeable membrane is prepared by the process comprising the steps of:preparing a solution of a polyimide material consisting essentially of at least one aromatic polyimide comprising at least 90 molar % of at least one recurring unit of the formula (I): ##STR1## wherein R represents a divalent aromatic radical, in a solvent consisting of at least one phenol compound in the state of a liquid or melt;forming a thin layer of the polyimide solution, and;coagulating the thin layer of the polyimide solution by bringing the thin layer into contact with a coagulating liquid to form a semipermeable membrane.

Abstract: A large multi-cavity mold is loaded with a plurality of horizontal radially leaded capacitors. The closed mold grips the leads. A top knock-out pin pushes each component body downward a predetermined degree so that all the bodies are left in about the same position within the corresponding mold cavity. A bottom knock-out pin then pushes each component body upward only slightly above the cavity center so that upon its withdrawal, the programmed lead wire stresses cause the bodies to spring back just to the mold cavity center position. Molding resin is then introduced into the cavities. The incidence of show-throughs is greatly reduced.

Abstract: A two-dimensional integral net having a nap in form of relatively long fibres which are integral with the net and protrude from the edges which surround the apertures of the net.A method of producing this net from a film is by heating selected areas of the film to a molten state and dragging out this molten material into fibres to leave apertures in the film while controlling the fibre-dragging by cooling with an air jet.