Abstract: For producing rod-shaped tobacco-smoke filter components each having one or more annular tobacco-smoke barriers, annular grooves open at their peripheries are formed in rod-shaped bodies of smoke-filtration material, the grooved bodies are conveyed in a direction transverse to their longitudinal axes along an arcuate path, and settable barrier material is deposited in the grooves during the conveyance along said path, the bodies being rotated about their said axes during the deposition of the barrier material.

Abstract: A method of closing or sealing a filler passage formed in a neck or stem protruding from the small access opening in the upper end of a substantially closed centrifuge tube. The neck is formed of a readily fusible material and a heat conductive cap member is positioned over the open end portion of the neck closely confining it therein. Heat and pressure are applied to the cap causing progressive portions of the neck to melt and fold into the filler passage where it forms a molten mass within the filler passage above the access opening to the tube. Heat and pressure are removed, permitting the cap to cool and the molten mass to solidify completely sealing or filler passage of the centrifuge tube. The cap is then removed and the centrifuge tube is fully prepared for centrifugation.

Abstract: Device for the longitudinal drawing of thermoplastic preforms possessing a closed base and an open neck during the blow moulding of these preforms comprising a rod introduced in the preforms through their open neck and arranged so as to exert a controlled axial thrust on the base of the preforms in which the drawing rod is provided with slots and is actuated by a driving sleeve in which it can slide and with which it is rendered integral by means of retractable wedges housed in the slots and held in place by means of calibrated springs.

Abstract: A method and apparatus for belling a plastic pipe wherein the pipe is heated until a predetermined force can move the pipe onto a mandrel; the magnitude of the force being such that the pipe is heated to a temperature between its memory temperature and its breakdown temperature.

Abstract: A method for making a centrosymmetrical spider of a universal joint by extrusion molding involves pressing both end faces of a cylindrical blank the same distance towards the center of the blank to force the blank material radially outwards from the center of the cylindrical blank in a stream which is symmetrical relative to the two end faces and into a cavity of a split mold.Also disclosed is a molding apparatus for practicing the method. The apparatus includes a floating mold. One end of the apparatus can be rigidly fixed to a press for operating the punches which provide the extrusion pressure.

Abstract: The invention is a process for manufacturing an irradiation cross-linked molded article by utilization of molding apparatus wherein at least a portion of the molding apparatus is separable and capable of withstanding irradiation.

Abstract: A profiling die for use in processing tubular material where finish is a priority, such as for use in a catheter, the die being composed of a body of heat conductive material having a through passageway composed of a first bore extending from one face and a second coaxial bore extending from an opposite face, the second bore being larger than the first bore and there being an intermediate section between the bores which is tapered from the diameter of the second bore to the diameter of the first bore and wherein the tapered intermediate section and the first bore are aligned by an integral annular insert of Teflon material and preferably a keeper is provided to maintain the insert within the die.

Abstract: A mandrel for producing connecting sockets at the end of thermoplastic pipes, the mandrel containing a first and a second row of retractable segments and apparatus for actuating these segments. The apparatus comprises a first and a second actuating bush arranged so as to move axially on a central shaft. The segments of the first and second rows of segments are pivotably mounted on bushes by means of parallel, axially displaced joints. Support surfaces, which are orthogonal to the mandrel axis, serve to hold the segments during their radial movement.

Abstract: An inplace gasket belling machine wherein a plastic pipe is received in a tilt clamp fixture and tilted thereon for receiving a heating bell on one end portion of the pipe. Heated fluid is directed over the inserted pipe end portion. The heating bell may be withdrawn from the pipe in intermittent steps to afford a temperature gradient along the pipe end portion. The pipe is then tilted to a horizontal disposition for the insertion of a gasket belling mandrel into the heated end portion of the pipe. A gasket magazine is supported adjacent the mandrel for automatically placing an annular gasket on the mandrel for insertion into the pipe end portion. The mandrel includes an outer housing and a mandrel body portion telescopically received within the outer housing. The outer housing has a stop shoulder and a gasket positioning sleeve extended forwardly therefrom. The mandrel body portion has a flared pipe expanding portion and a gasket carrying portion rearwardly thereof.

Abstract: Disclosed is a thermoplastic container formed from a flattened thermoplastic sleeve that is fabricated at a first manufacturing location. These flattened sleeves are conveniently transported to a second manufacturing location where they can be compactly stored. As containers are needed, the ends of the sleeve are stiffened by forming a flange or bead, thereby providing a tubular central section with a stable cross-sectional shape suitable for the application of conventional end closures.

Abstract: A method of curing a polymeric hose are provided wherein a hose to be cured is confined within a tubular preformed spiral confining wall of a mold structure to thereby provide optimum support for the exterior surface of such hose during curing which assures provision of a precision outside surface yet enables curing of a substantial length of hose in a comparatively compact volume.

Abstract: The invention relates to a manual and portable device for crimping ferrules onto bundles of optical fibres comprising a number of fibres such that these fibres may be hexagonally arranged. The device primarily comprises means for holding the ferrule in the tool, crimping means essentially consisting of an element supporting three knurled rollers which is capable of being rotated whilst the three knurled rollers, at the same time as rotating, may be moved progressively nearer the axis of the bundle until their spacing corresponds to the minimum cross-section of the bundle. The device may also comprise a release mechanism enabling the approach movement of the knurled rollers to be stopped when this cross-section is reached.

Abstract: An apparatus for the manufacture of transversely contoured tubing from thermoplastic material. The tube emerges in the plastic state from an extrusion nozzle and is guided into a mold composed of a plurality of mold sections in series, with inner side working surfaces forming the transverse contours. Each of the mold sections is composed of two mold halves which are arrayed along a straight molding run in two confronting rows and which are circulated. In the circulation, the first two mold halves are moved apart and out of the molding run at the end of the molding run and are guided to a return run on which they are separately returned to the beginning of the molding run where they are rejoined to the preceding mold half. The mold halves are guided on the return run in a continuous, accelerated and then decelerated movement by a transfer mechanism which couples and uncouples from the mold halves as actuated by pneumatic cylinders under the control of limit switches.

Abstract: An insulation comprising a polyether polyester thermoplastic copolymer obtained by reacting 1,4 butane diol terephthalate with terephthalate esters of polytetramethylene glycol is coated over an irregularly configured conductor, such as for example, a tinsel conductor, suitable for use in telecommunications cordage by moving the copolymer through an extruder and along a flow path formed between a core tube and wall of a die cavity. The die cavity adjacent to the throat of the die has a frustoconical portion formed with an approach angle of sufficient magnitude to minimize the pressure drop through the extruder to extrude the copolymer at a temperature slightly above the melting point of the copolymer.

Abstract: In apparatus for producing corrugated thermoplastic tubing and which comprises a pair of complementary upper and lower mold assemblies each having an endless array of articulately interconnected mold blocks which are driven along a forward run and back along a return run, the mold blocks co-operatively interengaging in pairs along said forward run to form an axially extending tubular mold tunnel, there is disposed at the entrance to the tunnel an extrusion head having an inner core member and an outer member which surrounds the core member and is spaced therefrom to define therebetween an annular passage terminating in an annular orifice and through which the tubing of thermoplastic material is extruded for expansion by blow molding within the tubular mold tunnel, the annular orifice having portions of increased width in axial alignment with the locations of interengagement between the mold blocks of the mold assemblies in the forward runs thereof, thereby to provide the tubing with thickened portions at thes

Abstract: This invention pertains to the forming of a laminated plastic such as Formica (trademark of Formica Corporation) having a decorative facing layer. A controlled heating cylindrical column of metal is provided. This cylindrical column is secured to a base which may be secured to a workbench or the like. A control apparatus is also provided which includes an "on-off" switch, a temperature indicator, a variable voltage or current control and an indicator light for determining when the apparatus is in operation.

Abstract: A vulcanization apparatus for a continuous length of article comprises a curved vulcanizing pipe devised to ensure, with the aid of a heating liquid medium recirculation system assembled thereto, a stable and even vulcanization of such a continuous length of article without damaging the same, a tubular cleaner for removing the heating liquid medium deposited on said continuous length of article and a cooling pipe, said vulcanizing pipe, tubular cleaner and cooling pipe being connected together in the cited sequence, without a provision of any spacious separating means or sealing means therebetween, in an arrangement in which a mutual ingression between the heating liquid and cleaning and/or cooling medium can be prevented from and in which the economy can be improved in cost as well as in space while ensuring safety.

Abstract: Apparatus for forming an integrally formed thermoplastic conduit and washer for being connected with a second conduit by way of conventional fitting, characterized by means for of inserting a guide pin within the tubing so as to maintain a predetermined internal diameter within the tubing and washer; emplacing a mold about the guide pin and tubing to hold the tubing, the mold having a washer cavity to define the exterior dimensions and form of the washer with the tubing extending about the guide pins and into the washer cavity; means for heating at least the outer most portion of the wall of the tubing that is within the washer cavity to its softening temperature and means for compressing the softened tubing walls longitudinally of the pin to accordion pleat the walls into a washer having an exterior film thereabout and having the accordion pleated walls therewithin to have an inherent springiness that readily effects sealing interconnection with another conduit shape and that frictionally holds a tightened f

Abstract: A catheter assembly including a plastic tube having a cup-shaped bulb at one end and which is oval in cross section. The walls of the bulb are thicker than the remainder of the tube and a hub is molded about the bulb both interiorly and exteriorly thereof. The bulb is formed by placing the tube on a mandrel, which extends from a mandrel carrier, and thereafter placing the carrier on a base so that the upper end of the tube and mandrel extend through a slot and into a heating cavity defined by a housing. The upper end of the tube is subjected to radiant heat on opposite sides thereof to heat the circumference of the tube unevenly to form and define the cup-shaped bulb. The upper end of the tube is heated to a temperature close to its melting point.

Abstract: A method and apparatus for forming hollow members wherein a preformed tube is placed between an upper and lower die having the finished tube contour, while each end of the preformed tube has a cylindrical end which is held by the dies; each cylindrical end is flared outwardly by the tapered end of a nozzle which is inserted and forced into each end forming a seal therewith. An incompressible forming substance is injected into one inlet nozzle through said preformed tube and out the other outlet nozzle into a chamber, a bleed valve permits purging the air; the substance is contained within said preformed tube and a piston is inserted into said chamber to increase the pressure on said substance. This finally forms the preformed tube into the shape set by the dies.

Abstract: A method and an apparatus for treating mouth areas of rigid plastic containers in order to prevent cracking during the capping of the containers. The width of the mouth opening of the container is prior to capping temporarily increased by means of a mandrel, which at a relatively low speed is introduced into the mouth opening. This results in a cold working and stretching of the plastic material adjacent to the opening and when the mandrel after a short while is with-drawn from the mouth opening the plastic material around the same is given a molecular orientation in the circumferential direction. The preferred apparatus includes fixing elements for holding a container so that its mouth opening is aligned with the mandrel, which is cylindrical with a somewhat greater diameter than the mouth opening and axially displaceable into the mouth opening.

Abstract: The process modifies the thickness of the wall of a tube of thermoplastic material which issues at constant speed from an extruder and is driven downstream of and in the extension of the extruder by a drawing machine. The drawing machine has motorized rolling members which frictionally drive the tube and permit modifying the speed at which the tube is driven. The thickness of the wall is modified by producing a relative movement of translation between the extruder and drawing machine while maintaining the speed of rotation of the rolling members.

Abstract: A process and jig for field bending relatively large diameter plastic pipe, the jig being to guide the pipe at the point of tangency adjacent the bend after the pipe is heated and bent to form a smooth curvature to the desired radius and degree of bend as determined by the jig. The jig includes a two-piece spreader tube and a right and left hand guide, each adjustable in width, angle and spacing. The guides are U-shape and extend beneath the spreader tube so that the pipe may be placed on a flat horizontal surface. Each guide is provided with a protractor, one of which includes an offset scale so that offsets or curves with generally parallel tangents may be formed. The spreader tube includes a scale to ascertain the chord in terms of the radius for given degrees of bend.

Abstract: Disclosed herein is a device for forming the gasket housing in the socket joints of plastic material tubes, comprising a ring placed inside a housing made circumferentially in an expander that can be inserted in the end of the tube to be widened, the said ring comprising a first ring, that is to say, an inner ring, provided internally and circumferentially with a groove defining the chamber on which the expansion compressed air acts, the said first ring being made of an elastic material that "gives"; a second ring that can be coupled externally and coaxially to the said first ring, made of an elastic material of a hardness somewhat greater than that of the aforementioned first ring; and a number of metal pins, parallel with one another, placed over the outside circumference of the said first ring.

Abstract: For shaping a component of a smoke filter, a rod of the material to be shaped and a heated former are relatively moved in contact with each other, in an arcuate path, in a direction transverse to the longitudinal axis of the rod, whereby an impression, for example an annular or helical groove, is produced in the rod by the former. For the said relative movement, the rod may be supported at the periphery of a rotor, while the former comprises a heated arcuate stator element or elements projecting inwardly towards the rotor. The rod may be turned about its axis during the relative movement, for example by a pair of rollers by which it is supported at the periphery of the rotor. A surface or surfaces bounding the impression, for example the bottom surface of a groove, may be sealed, during the shaping operation, so as to be smoke-impervious.

Abstract: Control apparatus for automatically maintaining the desired blown tube diameter in the blown plastic film process where the blown tube is internally cooled by a gas flow into and out of the interior of the tube. A by-pass duct having a by-pass damper is provided on either the inlet or exhaust duct by-passing the inlet or exhaust duct damper respectively and this by-pass damper is controlled by tube diameter sensors. By thus controlling only a small percentage of the inlet or exhaust flow a very fine and stable control is achieved. Control apparatus is also provided to maintain the by-pass damper in its optimum operating range.

Abstract: In order, in the molding of corrugated thermoplastic tubing, to overcome the disadvantage that pressurized air which is supplied to a zone within the tube of thermoplastic material as it is extruded from an extrusion head into the entrance of a tubular mold tunnel may tend to cause rupturing of the tube at the area immediately adjacent to the extrusion head where the tube is unsupported by the wall of the tubular mold tunnel the pressurized gas is supplied at a low pressure to a first zone within the tube of thermoplastic material to support the tube against the wall of the tunnel, and pressurized gas at a higher pressure is supplied to a second zone within the tube to urge the tube outwardly into the corrugations of the tubular mold tunnel. A first sealing arrangement separates the first zone from the second zone which is disposed downstream of the first zone, and a second sealing arrangement defines the downstream end of the second zone.

Abstract: A method of molding a socket part on a synthetic resinous pipe end is disclosed. The socket part is for use in the connection of synthetic resinous pipes and is provided with a filler ring for filling a space created by a spigot pipe end, the inclined surface at the interior of the socket part, and a virtual inner surface formed by the two connected pipes. In addition, the filler ring fulfills a function in the capacity of a stopper which regulates the insertion length of the spigot pipe. For the purpose of its being retained in the socket part, the filler ring to be employed should have its external diameter be slightly larger than the internal diameter of the part which has been molded as the socket part, and is held through the medium of a holding means which is maintained concentrically with the core mold.

Abstract: An apparatus for continuously vulcanizing elastomeric hose employing a tubular, helically extending vulcanizing chamber with an entrance for unvulcanized hose at one end and an exit for vulcanized hose at the other end terminating in a fluid bath which collects the vulcanizing fluid for re-circulation. Means are provided to circulate a vulcanizing fluid at elevated temperatures and pressures through the chamber to transport the hose therethrough while providing the heat and pressure required for satisfactory vulcanization. The fluid bath provides means for effectively preventing escape of pressurized fluid contained in the system.

Abstract: A method of coating a fibre in which a sleeve of polymer is extruded, fibre is fed into the sleeve as it is formed, and the diameter of the sleeve is reduced by a drawing process to produce a sleeve of polymer which loosely envelops the fibre. We also provide a fibre having a tubular sleeve of polymer, the sleeve having its molecules orientated to lie longitudinally with respect to the axis of the fibre. The sleeve has relative strength in a longitudinal plane and relative weakness in a transverse plane.

Abstract: Apparatus for cold-forming a thermoplastic sheet to provide a circular container part such as a lid or dish comprising opposing concentric die members for engaging a sheet of thermoplastic material, the sheet being drawn around the circular edge of one of the die members to provide a concentric central portion and a concentric annular depending skirt having a proximal edge adjacent the central portion, an intermediate portion, and a distal free edge, providing an annular void in the die members adjacent the skirt. Apparatus is provided for moving the free edge toward the proximal edge while holding the proximal edge to buckle the intermediate portion into the void. The void has a tapered surface inclining radially outwardly and axially toward the proximal edge to hold the free edge radially inwardly, thereby to permit the intermediate portion to buckle outwardly into the void.

Abstract: Apparatus for manufacturing lengths of rubber hose of curved shape comprises means for feeding a sequence of flexible mandrels in end-to-end relation to and through a first extruder which extrudes a continuous rubber hose onto the string of mandrels. Downstream of the extruder there is means for wrapping reinforcing thread around the hose and a second extruder for extending a second layer of rubber onto the reinforced hose. Downstream of the second extruder the hose is cut at locations between successive mandrels to form separate lengths of hose each with a flexible mandrel therein. Clamping means engages opposite ends of each mandrel with a hose length thereon and forces the ends toward one another to bend the mandrel and hose to curved form. While thus held in curved form, the hose lengths are vulcanized. The mandrels are then removed while evacuating the interior of the mandrel to contract it and forcing pressure fluid between the mandrel and the curved hose length to facilitate the removal.

Abstract: A heat exchanger coil is formed by winding a plurality of flexible tubes to form a coil. The turns of the coil are separated in the axial direction of the coil by means of radially disposed separator elements. The turns of the coil are separated in the radial sense by inserting separating means. Said separating means are positively controlled by the radially disposed separating elements relatively to the coil, both in the direction of winding the coil and in the opposite direction. The separating means are locked in the radial direction of the coil by winding the tube over them.

Abstract: A method for molding an end portion of a tubular thermoplastic parison prior to a blow molding operation to form a parison finish and an annular support flange. The method includes closing a laterally movable, sectional mold onto a circumferential section of a parison so that at least one end portion of the parison extends out of the mold. The extending end portion of the parison is then thermally conditioned to a deformable temperature and thereafter the parison is axially displaced to telescopically insert the thermally conditioned end portion within the mold into general radial alignment with annular, longitudinally spaced finish and support flange cavities. Next, an internal support is telescopically inserted within the thermally conditioned parison portion in preparation for the compression molding steps; which include axially displacing the opposed ends of the parison to force thermally conditioned, deformable plastic parison material radially outwardly into the flange and finish cavities.

Abstract: Cooling an extruding thermoplastic tube by feeding the tube adjacent a cooling surface, maintaining a sheath of heat-transfer fluid between the tube and surface and preferentially cooling at least a selected area of the tube by transversely displacing the tube to decrease the thickness of the sheath between the selected area and the cooling surface. The invention is particularly suitable, for the production of thermoplastic films by orienting a cast tubular extrudate which has been cooled by means of an internal mandrel.

Abstract: A die for cooling, sizing and smoothing an extrudate includes a mounting plate having an orifice for receiving the extrudate, and a plurality of die members each having an aperture. The die members are mounted on the mounting plate in cascade relationship so that the members are axially spaced and the apertures are in alignment with the orifice in the mounting plate. The die members may be unitary flat metallic discs each having an aperture, or the die members may be a composite of a pair of overlying metallic discs each disc of the pair having an elongated slot extending inwardly from a peripheral edge, with the discs oriented so that the closed end of each slot defines a portion of the aperture.

Abstract: A device for the production of corrugated, protective separators for batteries which are made of woven polyester material. The device is provided with two alternating sets of shaping rods and two sets of clamping jaws which are movable in both the vertical and lateral direction. A third set of jaws is movable only in the vertical direction. The shaping rods are inserted into alternating channels in the material while the material is securely held by the clamping jaws and the material is hardened by means of a furnace. Once the channels are heat set, the shaping rods are withdrawn and the separator is severed by means of a cutting unit. A new piece of material is then positioned for similar fabrication.

Abstract: An apparatus for flaring plastic tubing comprising a motor and speed reducing unit mounted on a slide member for relative movement towards and away from a set of stationary die members in which various diameters of plastic tubing may be inserted. A flaring head is mounted on the output shaft of the speed reducing unit in alignment with the central axis of a tubing positioned in the dies. The maximum forward and rearward movement of the slide member is adjustable so that the necessary movement for producing the desired flare on various diameters of tubing can be produced.

Abstract: A method and device for forming grooves in a thermoplastic pipe, by surrounding said pipe with a mould having one or more grooves in its interior wall and positioning one or two annular chambers into said pipe, a flexible sealing circular body being sealingly movable in said chamber, and the outer circumference of said body in its free state being substantially equal to the inner circumference of the mould part facing said ring minus about twice the wall thickness of the pipe in its final state. The circular body can be retracted into the annular chamber which is provided with a bottom part having a clover-leaf-like cross section, the circumference of said cross section being substantially equal to the inner circumference of said circular body.

Abstract: Method and apparatus for forming silicon U-shaped carrier members from straight silicon rods using a combination of rod movement, zone heating, and controlled bending.

Abstract: In a blown tube process of producing thermoplastic film or sheeting, the blown tube is collapsed by passing it through a trapezoidal frame assembly to change the circular cross section of the tube to a square cross section. The square cross section tube passing from the trapezoidal frame assembly is then passed through a predeterminedly controlled flattening transition section to a pair of nip rolls in a manner that the film arrives at the nip rolls with minimal stretching.

Abstract: A forming apparatus comprising mold parts adapted to fit inside a tube to shape a groove or other profile therein. The parts are segments of the periphery arranged in at least two groups, such that the parts of one group alternate with the parts of the other group. The first group of parts is undercut to provide pockets in which the second group may rest when the mold parts are retracted. The first group is extended first, leaving spaces therebetween which are filled by the second group when they are extended. A mechanical actuation of the parts is disclosed in one embodiment and fluid-actuation is disclosed in a second embodiment.

Abstract: A continuously travelling web of material is processed at longitudinal intervals between a pair of confronting transverse processing tools. The tools are mounted on carriers guided in pairs on endless chains to follow a path composed of two parallel straight sections joined at the ends by semi-circular sections, the latter being relatively adjustable. The chains are guided on adjustable sprockets so that their runs are parallel and overlap. Confronting extensions of interconnecting hinge pins for the links of the chains are engageable in recesses provided in the tool carriers.

Abstract: An apparatus for supporting a sheathing material comprises a mandrel containing magnetically conductive material, and a plurality of spaced magnets. The magnets contain aligned circular apertures. The mandrel is centered within the apertures by a magnetic field applied substantially uniformly around the periphery of the mandrel. The mandrel is thus supported in a freely suspended manner. Sheathing material can be inserted onto the freely suspended mandrel and advanced freely therealong so as to be treated while mounted on the mandrel.

Abstract: A method and apparatus for making flexible rubber tubing with axially spaced annular or helical corrugations. A sleeve of uncured vulcanizable rubber is slipped over a forming mandrel and an external form comprising a length of flexible, corrugated, axially compressible rubber tubing is positioned over the sleeve. The interior wall of the external form defines a shaping surface for use in forming embryonic corrugations in the sleeve. The sleeve is radially expanded into the shaping surface and the form and sleeve are axially compressed concertina-fashion to increase the radial dimensions of bulged portions of the sleeve between the corrugations of the external form to make embryonic corrugations in the sleeve. The sleeve and external form are then removed from the forming mandrel and the sleeve is placed on a curing mandrel with the corrugations at desired spacings, after which the sleeve is cured.

Abstract: A method and apparatus for manufacturing a coiled slide-fastener filament, according to which an initially straight portion of the filament is deformed into a filament portion of substantially V-shaped configuration having a tooth formed at the crest where the legs of the V-shaped filament portion intersect, with these legs then being pushed together into side-by-side relation while being advanced into a gap between a pair of teeth of a gear-setting wheel.

Abstract: A method and apparatus for making concrete pipe and, more particularly, for the vibration treatment of concrete pipe for compaction and residual stress relief. A concrete pipe is formed within an external jacket employing a rotary packerhead method wherein the jacket is positioned vertically and the packerhead is moved progressively upwardly within the jacket rotating and distributing mix radially outwardly and troweling the internal surface of pipe under formation. On completion, the green pipe is removed from the pipe making machine and transported to and above a hollow vertically split and radially expandable and contractable cylinder. The pipe is lowered about the cylinder with the latter in a contracted condition, the cylinder is expanded into engagement with the pipe internal surface, and a vibrating means within the cylinder is actuated to vibrate the pipe throughout its length.

Abstract: A process and apparatus for making a container or like product having an end face and a tubular skirt extending from it. The container or like is made from a length of tubular thermoplastic material. This length is sleeved over a mandrel, with one end portion projecting from it. This end portion is heated to soften it, constricted inwardly and then moulded between the end of the mandrel and a presser cap. The end face may have a central hole or nozzle formed by moulding around a stem projecting from the end of the mandrel.

Abstract: Synthetic resinous thermoplastic tubing is reduced radially in diameter with minimal increase in length by passing the tube through a plurality of successively smaller dies wherein a minor portion of the die moves relative to a major portion of the die during the reduction step. Plastic tube is obtained which has a tendency to expand radially with a minimal alteration in its length. Such tubing is particularly suitable for lining of pipe.

Abstract: In continuous blow molding machinery employing a series of carriers successively traversing a closed path between preform loading, molding and molded article eject stations, an upwardly inclined removal ramp in the path of underblown parts but clear of the carriers is provided between the molding and loading stations for automatically removing such parts from the carriers. The method involves continuously stripping such parts before the loading station by elevating them relative to a rod portion of the carrier via interfering engagement with such ramp.