Abstract: A mixture of substances is fed to an extruder and, after being homogenized and liquefied, is extruded on an electric conductor or as a pipe. To meet electric cable specifications, the insulating material used is a polyolefin, such as polyethylene, cross-linking of which is brought about by the addition of a silane, a free-radical generator, and a silanol condensation catalyst. After extrusion, cross-linking takes place in the presence of moisture. To facilitate penetration of the moisture and accelerate cross-linking, an agent capable of reducing the rate of crystallization of the polymer, such as vinyl acetate, is used as a further additive.

Abstract: An improved screw-type extruder intended to increase the output obtainable from a machine of certain dimensions while maintaining a satisfactory quality of the material extruded. This result is obtained by providing in the homogenization zone a thread crossed by a multitude of narrow passages, and in the feed zone means for overfeeding the plasticizing zone. These overfeeding means may, for example, consist in providing in this zone a cylinder grooved longitudinally or spirally or a double-screw section producing a forced pushing of the material toward the plasticizing zone.

Abstract: An apparatus for 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 one-screw extruder in which the mechanical thrust function is assigned to a first portion of the screw and of the cylinder, and in which the uniform heating of the material to be extruded is the function of a second portion, thus making it possible for each of the two portions to be specialized and to obtain a better performance of the extruder as a whole.

Abstract: An installation for treating metal wire, such as for coating a copper conductor, comprises at its upstream end a stationary wire-supply source having a reel support disposed within a loop-guard made of a gray iron or ductile cast-iron part in the form of a hollow body of revolution having an ogival profile. This part bears at its downstream end a conical tip defining the exit aperture for the wire. The inner surface of the loop-guard is machined by turning so as to be absolutely smooth and may also be subjected to a hardening treatment.

Abstract: A method of extruding a thin sheath of plastic material about electric wire, utilizing a plastic material capable of being shaped by extrusion after having been heated in a screw extruder, this material exhibiting the technical characteristics required for enamel-type insulation after cooling, without necessitating subsequent treatment. An extrusion material containing at least one partially crystalline thermoplastic polycondensate wherein the crystallites have a melting-point above 170.degree. C. answers these requirements.

Abstract: An installation is provided for extruding plastic material comprising a screw extruder having a cylinder provided with a hopper near the rearward end of said cylinder and with an extrusion head secured to the forward end of said cylinder, and at least one pump having a delivery pipe connected to at least one port disposed in the wall of said cylinder for delivering an additional fluid product to said extruder through said port or ports during the extrusion operation, the inner surface of said cylinder including a zone provided with grooves extending downstream starting from said hopper over a limited distance, said port or ports opening out into one or more of said grooved zone, said grooved zone being followed by a smooth zone, the inside diameter of which is less than the maximum diameter measured from the bottoms of said grooves, and wherein said screw extruder is of essentially uniform dimensions at the point of said zone and the portion of said screw extruder immediately upstream thereof.

Abstract: This document discloses apparatus for applying an insulating jacket to an advancing electrical conductor and includes a tubular enclosure for suspending said jacketed conductor in the presence of a treatment agent. The enclosure includes a stationary chamber and a telescoping tube to allow opening and closing of the upstream end of it. The telescoping tube is pressed axially against a pivotally supported extruder head.

Abstract: This invention is a screw-type extruder for plastics comprising a screw in a cylinder providing a feed zone, a plasticizing zone and a homogenization zone. The screw threads in the plasticizing zone are provided with marginal passageways so small as to provide heat exchange between the plastic and the screw, the latter being heated by friction.

Abstract: A double winding machine for winding metal wire and having an automatic wire-transfer device which includes a support, two pairs of coaxial reel-spindles borne by the support, and at least two reels. Each reel is provided with a wire-securing groove and is adapted to be held by a respective one of pairs of reel-spindles.The machine also includes two snagging members, each mounted on a respective one of the reel spindles of each of the pairs, and a deflection device operated at the time of transfer for changing the path of travel of the wire. The deflection device includes a wire-pushing mechanism adapted to engage the wire in the snagging member associated with an empty reel, a deflector adapted to cause relative displacement of the path of travel of the wire with respect to a full reel for engaging the wire in the securing groove of that reel, and a control for actuating the deflector just prior to the wire-pushing mechanism.

Abstract: A cooling installation for use in the production of insulated metal wire which installation includes a vat and means for guiding wire longitudinally within that vat and for ejecting cooling fluid against the wire, the installation also including a motor situated outside the vat and means for accumulating the wire and means for pulling the wire, both said means being disposed within the vat. More particularly the pulling means is disposed between two portions of the accumulating means, one portion of the accumulating means adapted to accumulate a constant length of wire and the other adapted to accumulate a variable length of wire.

Abstract: This invention relates to a device for regulating the water level in apparatus for treating an insulated electrical conductor, which device comprises two or more gates actuated by a control signal for filling and emptying the apparatus, a first control circuit having a broad range of adjustment, a second control circuit having a narrow range of adjustment, and an inverter, each circuit in turn comprising a first transmitter for producing a measuring signal, a second transmitter for transmitting a reference signal, and a comparator for producing a control signal and transmitting same to the inverter, the inverter supplying the control signal from the comparator of the first or of the second circuit to the gates.

Abstract: This invention relates to a downstream closure device for apparatus used in treating large-diameter insulated electrical conductors, the device comprising a main exit gasket, a movable plug, an auxiliary exit gasket borne by the plug, and means for controlling the movement of the plug.

Abstract: A machine for manufacturing cables by stranding individual wires, comprising: a pay-out apparatus having four pay-out reels and fixed supports therefor; a stranding apparatus situated after the pay-out apparatus and comprising a forming die receiving the individual wires; a take-up apparatus having a take-up reel, a support for the take-up reel, and a cable-puller for pulling the cable through the die at a predetermined speed; and further comprising wire-tensioning devices disposed between each of the pay-out reel supports and the die, each of the wire-tensioning devices comprising a guide member for one of the wires, disposed at a fixed location and coaxial with a respective one of the reels, a zone situated before the guide member for non-guided passage of a portion of the wire from the reel to the guide member, a motor for driving each of the pay-out reels at a variable speed of rotation, the speed being sufficient to cause the portion of wire to assume the form of a loop under the effect of centrifugal fo

Abstract: A winding machine equipped with a traverse mechanism to protect, for example, a reel or wire wound on a reel should feed wire break during feeding of the reel. The mechanism includes a carriage, borne by a support, which moves back and forth along the entire length of a reel and carries a pulley for guiding wire that is wound on the reel. A circular protective channel coaxial with the reel and borne by the carriage moves back and forth with the carriage. The channel includes a circular track portion extending in a plane parallel to and laterally offset with respect to the plane of the pulley, and a deflection portion situated in the same plane as the pulley and limited by a deflection wall.

Abstract: A cable-winding machine resting upon a foundation and having two uprights supporting two drum-supports respectively, a crosspiece connecting the uprights at their ends and a traverse mechanism movable along the crosspiece. Cooperative movement of the uprights and the traverse mechanism keeps the deflection of the cable to be wound at a desired level.

Abstract: A winding machine for metal wire including apparatus to protect, for example, a reel or wire wound on a reel should feed wire break during feeding of the reel. The apparatus includes: a support for at least one reel; a motor for driving the reel in rotation; a guiding mechanism including a traversing carriage bearing a pulley for guiding the wire as the wire is wound on the reel; and a protective device, to protect the reel in the event of wire breakage, including two protective plates of arcuate shape extending the entire length of the reel. At least one of the plates is hinged about an axis parallel to that of the reel and is movable between an open position and a closed position in which one of its edges meets a corresponding edge of the other of the plates, the opposite edges of the two plates being spaced from one another so as to define a longitudinal slot between them.

Abstract: This invention relates to an apparatus for winding a cable or a flexible tube on winding supports mounted on winding-machines, the apparatus comprising at least two winding supports, a guiding and shearing mechanism having at least one exit opening, and driving means, the guiding and shearing mechanism being disposed facing the winding supports, and the driving means being adapted to advance the cable or tube towards the guiding and shearing mechanism.

Abstract: A machine for alternate twisting of metal wire or cable, comprising a frame and a storage unit provided with two end-positioned twisting members and alternately driven about the axis of the wire or cable in first one direction and then the other, wherein the storage unit is linear and comprises a straight cable-supporting tube through which the wire or cable passes and which is caused to rotate at a speed equal to or greater than that of the twisting members and always in the same direction as the storage unit.