Abstract: A method for manufacturing a heat resistant resin film with a metal thin film is configured to include the steps of: biasing a conductive material to one surface of the heat resistant resin film; and applying electrolytic plating to the heat resistant resin film while using the conductive material biased to the one surface of the heat resistant resin film as an electrode, so as to form a metal thin film on the heat resistant resin film.

Abstract: A biofilm resistant fluid handling system is provided having at least one structural component adapted to retain or deliver fluid. The at least one structural component is formed from a biofilm resistant material comprising polymeric resin and an inorganic carrier conjugated with a biocidal metal ion. When a surface of the at least one structural component is exposed to a continuous or intermittent aqueous solution environment the formation of active biofilm on the surface is prevented and planktonic bacteria in proximity of said surface is killed. Additionally, methods for extending the biocidal properties of a biofilm resistant fluid handling system are provided.

Abstract: Rotationally molded plastic refuse container with an inner lining formed with an antimicrobial compound, such as silver based biocide, and method of molding the same.

Abstract: Polyethylene blend compositions suitable for rotomolding, rotomolded articles, and processes for rotomolding articles are provided. The polyethylene compositions include a first polyethylene having a melt index of 0.4 to 3.0 g/10 min and a density of from 0.910 to 0.930 g/cm3; and a second polyethylene having a melt index of 10 to 30 g/10 min and a density of 0.945 to 0.975 g/cm3. The composition has a density of from 0.930 to 0.955 g/cm3 and a melt index of 1.5 to 12 g/10 min, and the first and second polyethylenes differ in density by from 0.030 to 0.048 g/cm3. These compositions exhibit improved physical properties, such as Environmental Stress Crack Resistance and Izod Impact Strength. Articles produced from the compositions may also exhibit improved impact resistance properties, enhanced ductile break properties, and improved deflection resistance, which represents a combination of creep and fatigue resistance.

Abstract: Method for the production of a biocompatible polymer-ceramic composite material with a predetermined porosity, designed and determined a priori, which includes a first phase (a) of the production of a suspension of a bioceramic material in distilled water, a second phase (b) in the which a compact of the bioceramic material containing a desired quantity of water is obtained from the suspension, and a third phase (c) in the which the compact is mixed with a polymeric material and/or a liquid monomer.

Abstract: A method for producing a glass-like carbon pipe is provided. The method comprises the steps of producing a plurality of thermosetting resin molded articles by centrifugal molding, said molded articles each having the shape of the sections of a pipe divided in the longitudinal direction and each provided with threaded or fitting portions; integrating these molded articles by joining at the threaded or fitting portions; and carbonizing the joined pipe to thereby produce a glass-like carbon pipe. This method is capable of producing a straight or bent pipe with excellent mechanical strength and gas sealability at the joint, and this method enables production of a pipe at a low cost since no machining is required for providing the threaded or fitting portions.

Abstract: Disclosed are an electric pole manufacturing apparatus having an improved distal end, capable of reducing the cost, arranging tensile cores corresponding to a design load, and providing a high quality electric pole, and a method of manufacturing the electric pole.

Abstract: A plastic table structure includes a tabletop comprising a thin polymer shell layer surrounding an expanded foam core. The multiple layers of the finished tabletop are molded concurrently in a one-pass biaxial or centrifugal rotational molding process, and cured in an oven. The method includes the steps of introducing polymeric material into a mold, and rotating the mold while heating it to a first temperature so as to form a molten shell of a portion of the polymeric material on the inside of the mold. A foaming agent is introduced within the mold and mixes with a second unmelted portion of the polymeric material and distributes throughout the mold. When the mold reaches a second higher decomposition temperature, the foaming agent causes expansion of the second portion of the polymeric material, forming an expanded foam core inside the shell.

Abstract: A porous bat may be used on a pottery wheel including a locating pin at a nominal location. The porous bat includes an elongated hole at a location corresponding to the nominal location. The elongated hole is adapted to slidably fit over the locating pin. The hole has a first axis with a dimension sized to fit over the locating pin and a second axis with a dimension larger than the first dimension to compensate for variations in the location of the locating pin on the pottery wheel.

Abstract: A cylindrical element is manufactured by a process which includes depositing successive layers of thermoplastic materials in a cycle by rotation moulding, or by a technique enabling a deposit of successive layers, the cycle including at least one deposit by rotation moulding or by a technique enabling deposit of successive layers at a temperature from 170 to 240° C. The cylindrical element contains at least one layer containing an ethylene-vinyl alcohol copolymer with a density at the above temperature of between 0.94 and 1.4, and a melt flow index of between 1.3 and 4.2 g/10 minutes.

Abstract: Thermoplastic compositions containing metal materials and a method for preparing the same. The compositions are formed into particles having diameters suitable for a rotational thermoforming processing. The compositions are particularly applicable for use in slush molding processes where efficient heat transfer to the material is desired to form improved surface quality thermoplastic skin. A preferred method for preparing thermoplastic compositions containing metal material into a slush moldable powder comprises melt compounding the composition to form pellets, and further processing the pellets by cryogenic pulverization. A preferred method for forming micropellets uses an extruder having a gear pump to increase the melt pressure.

Abstract: A method of inhibiting the growth of algae and like organisms in plastic water tanks exposed to sunlight comprises providing an outer tank surface operative to reflect off a substantial portion of sunlight that hits the tank off the outer tank surface; and providing an opaque inner tank layer operative to substantially prevent sunlight passing through the outer tank surface from entering an interior of the tank. A two layer tank is provided comprising a light colored outer layer and a dark sun-blocking inner layer, and is conveniently made by a rotational molding process.

Abstract: The disclosed method for fabricating low cost laryngeal mask devices includes providing a mold, the mold including interior walls that define a hollow interior volume. The interior volume includes a first portion and a second portion. A liquid plastic material is introduced into the mold, and then the mold is moved so as to coat the mold's interior walls. The liquid plastic material and then allowed to cure. The cured plastic material is then removed from the mold and the cured plastic material includes a generally elliptically shaped plate and a cuff. The cuff is formed from plastic material that coated the portion of the interior walls that defined the first portion. The plate defines a laryngeal side, a pharyngeal side, and a central aperture. An interior perimeter of the cuff is attached to the laryngeal side of the plate proximal to a perimeter of the central aperture. An outer perimeter of the cuff is attached to the laryngeal side of the plate proximal to an outer perimeter of the plate.

Abstract: A method of manufacturing an integral one-piece solar collector panel 10 by a rotational moulding process is disclosed. The solar collector panel 10 has a plurality of fluid ways 15 extending between opposed ends 18, 19 and transverse headers 18, 19 opening into the open ends of the fluid ways 15. The panel 10 is moulded by a rotational moulding process using mould faces with a non planar topography, eg in the form of a plurality of lines projecting outwardly proud of the remainder of the mould plate. This enables areas of the moulded body 12 to be formed that are not hollow and form a solid wall in the moulded panel and other areas of the body to be formed that are hollow and form the fluid ways 15 and headers 18, 19. After the moulding of the panel 10 has taken place the two opposed mould faces are moved towards each other to cause the contacting layers of mould material to firmly adhere to each other.

Abstract: Liquid containes made from certain ethylene copolymers have been found to leak less, swell and wrap less than conventional plastic liquid containes. The invention therefore provides the use of an ethylene and at least one C3-10 ?-olefin copolymer having the following properties: i) MFR2=2–10; ii) MFR21/MFR2=15–20; iii) density —925–950 g/cm3; iv) molecular weight distribution Mw/MN=2.1–3.5 in the manufacture of a liquid container.

Abstract: An improved double wall tank has two or more threaded fittings, with a steel outer tank and a thermoplastic inner tank. The inner tank is formed within the outer tank by rotational molding. The inner tank is bonded to the outer tank in an area of the fittings, but is otherwise separate and apart from the outer tank. Before carrying out the rotational molding process, bonding material is applied to the outer tank in the area of the fittings. The thermoplastic material is in powder form and includes mold release material. The thermoplastic material is inserted into the outer tank before rotational molding. The degree of shrinkage of the inner tank can be controlled by air pressure including an area between the fittings.

Abstract: A multi-layer rotational-molded plastic article has an area, such as a sight line for viewing content levels, where an inside layer protrudes through the outside layer and may be bonded to it. A first flowable material such as plastic resin is introduced into a mold having an insulating member extending through an aperture or slot into the mold. The mold is rotated and heated to less than full cure. The insulating member is removed, a second, transparent flowable material is introduced into the mold, and a cover member replaces the insulating member. The mold is rotated and heated to cure both resins, and only then cooled and opened.

Abstract: A system for manufacturing an elastomeric tire utilizing a separate formation of a package having a tire core shape and containing tire belts, plies and beads. The package is formed by a laying up of layers of pre-cure elastomer intradigitated with sections of porous fabric, where the fabric fibers are placed at desired crossing angles to one another, and the pre-cure elastomer layers are positioned therebetween as a sandwich, with the sandwich then cold rolled into the tire core shape. Inelastic hoop shaped beads are fitted to and encapsulated in the tire core side walls ends and, as required, an inelastic belt is fitted around the tire core tread area that is secured thereto as by cold rolling a layer of pre-cure elastomer thereover, completing the tire core package. The tire core package is fitted into a mold, preferably a spin casting mold, and is supported therein equidistant from the mold cavity walls to receive an elastomer sprayed therein as the mold is spun.

Abstract: A variety of hollow structures with unique morphologies were manufactured with a rotational spinning technique. Phase separation of soluble solutions or emulsions was induced within a filled mold as it was being rotated about one of its axis. The density difference between phases results in sediment at the inner lumen of the mold under centrifugal forces. After or during sedimentation, gelation of the phase-separated particles fixes the hollow structure morphology and the solvent remains in the center of the mold. The solvent is removed from the mold resulting in a coating or tube. By controlling the rotational speed and the formulation chemistry, the tube dimensions and wall morphology can be manipulated. This technique offers a new approach to the manufacture of polymeric tubes. It requires small quantities of starting material, permits multi-layering of tubes, is applicable to diverse polymers and can result in highly diffusive hollow structures while maintaining good mechanical strength.

Abstract: Polyethylene blend compositions suitable for rotomolding, rotomolded articles, and processes for rotomolding articles are provided. The polyethylene compositions include a first polyethylene having a melt index of 0.4 to 3.0 g/10 min and a density of from 0.910 to 0.930 g/cm3; and a second polyethylene having a melt index of 10 to 30 g/10 min and a density of 0.945 to 0.975 g/cm3. The composition has a density of from 0.930 to 0.955 g/cm3 and a melt index of 1.5 to 12 g/10 min, and the first and second polyethylenes differ in density by from 0.030 to 0.048 g/cm3. These compositions exhibit improved physical properties, such as Environmental Stress Crack Resistance and Izod Impact Strength.

Abstract: Disclosed is a method for manufacturing composite granules having a homogeneous particle distribution, comprising powders of multimodal particle size distribution and phenol resins, and a method for manufacturing green bodies having homogeneous microstructure without particle separation from the granules.

Abstract: A process for manufacturing a capital for an architectural column. The inside of a mold for an architectural column is lightly coated with a mold release. A first opening of the mold is placed upon a surface, and a plug is positioned on the surface within the first opening. Through another opening foam is poured around the plug. After the foam has hardened, the mold is removed from the surface. All other openings in the mold are securely covered. Then an elastomer is introduced into the mold, and the mold is rotated about multiple different axes. The introduction of the elastomer is repeated after the prior coating created by the introduced elastomer has become tacky but before the prior coating has become firm. After the final coating of elastomer has become tacky but not firm, foam is introduced into the mold.

Abstract: A decorative cover for a post having a hollow body. The hollow body includes a continuous wall having a substantially uniform thickness, and a cavity having at least one undercut that would prevent a core from being pulled from the cavity. The decorative post can be manufactured by providing a mold, introducing a liquid thermosetting resin within the mold, rotating the mold about first and second axes, curing the liquid thermosetting resin as the mold is rotated to form a body with a substantially uniform wall thickness, and removing the cured liquid thermosetting resin from the mold.

Abstract: A balustrade product including an elongated molded housing formed of a synthetic material is disclosed. An insert member is embedded within the molded housing to form a plurality of holes extending longitudinally through the molded housing. The insert member includes supports having openings and pipes extended through the openings. The supports each have a circumferentially spaced plurality of tabs that are sized to extend to an outer portion of the molded housing. The pipes are positioned in parallel relation to one another and in parallel relation to a longitudinal axis of the balustrade product. Each of the holes is configured to receive connecting pins for releasable connection with the support structure. The balustrade product is formed by centrifuge molding process with the insert member placed within the mold halves allowing the tabs to engage the mold halves to position and hold the insert member in place.

Abstract: A spinner disc for fiberizing a molten thermoplastic fiberizable material in a rotary fiberization process includes a base plate, an annular peripheral sidewall, and an upper annular reinforcing flange. The annular peripheral sidewall of the disc has a plurality of annular extending rows of fiberizing holes therein for fiberizing thermoplastic materials by centrifugal force. At least an uppermost row of the annular extending rows of fiberizing holes is interrupted by a plurality of spaced apart generally vertically extending holeless retaining bands for maintaining the upper annular reinforcing flange connected to the annular peripheral sidewall when the annular peripheral sidewall cracks along one of the annular extending rows of fiberizing holes due to the hole wear and enlargement that occurs during service.

Abstract: A composite crucible for pulling up monocrystalline silicon, which is superior in shape stability and suitable for a large-sized one is provided. The composite crucible is characterized in that a carbonaceous material as an outer layer and a quartz glass as an inner layer are integrally formed. Methods for preparing and regenerating a composite crucible are also disclosed.

Abstract: A method of fabricating a PVC ornamental article having effects of imitated materials includes steps of: (a) mold casting: making a prototype of a desired ornamental article, exploding said prototype into a plurality of blank elements, coating said blank elements with silicone to form hollow silicone molds, injecting a wax material into said hollow silicone molds to obtain a wax object, taking out said wax object for trimming and electroplating said wax object, and melting said wax object to obtain a mold; (b) blank formation: adding colorants into said PVC plastic material and mixing said colorants to obtain desired colors, injecting said PVC plastic material into said mold, utilizing centrifugal force to affix said PVC plastic material onto an inner wall of said mold, and removing molded PVC from said mold to form a blank by force before said molded PVC dries, filling a filler into said blank to increase hardness; and (c) assembly: assembling blanks together and joining the blanks with other decorations to

Abstract: Hollow polymeric structures with unique morphologies are manufactured with a rotational spinning technique wherein phase separation of soluble solutions is induced within a filled mold as it is rotated. As phase-separation occurs, an increase in density of one phase results in sediment at a periphery under centrifugal forces and after or during sedimentation, gelation of phase-separated particles fixes a tube morphology. By controlling the rotational speed and the formulation chemistry, the tube dimensions and wall morphology can be manipulated. The method requires small quantities of starting material, permits multi-layering of tubes, is applicable to diverse polymers and results in highly diffusive hollow structures while maintaining good mechanical strength.

Abstract: A method of fabricating a PVC ornamental article having effects of imitated materials includes steps of: (a) mold casting: making a prototype of a desired ornamental article, exploding said prototype into a plurality of blank elements, coating said blank elements with silicone to form hollow silicone molds, injecting a wax material into said hollow silicone molds to obtain a wax object, taking out said wax object for trimming and electroplating said wax object, and melting said wax object to obtain a mold; (b) blank formation: adding colorants into said PVC plastic material and mixing said colorants to obtain desired colors, injecting said PVC plastic material into said mold, utilizing centrifugal force to affix said PVC plastic material onto an inner wall of said mold, and removing molded PVC from said mold to form a blank by force before said molded PVC dries, filling a filler into said blank to increase hardness; and (c) assembly: assembling blanks together and joining the blanks with other decorations to

Abstract: A cover for a rotary die is centrifugally cast with multiple layers to substantially eliminate stress when the cover is cast in an arcuate shape for use in a die cutting system. A locking mechanism attached to ends of the cover is designed to be convenient to install on and remove from a cutting cylinder.

Abstract: A method and apparatus for removing fouling materials from the surface of a plurality of porous membranes (9) arranged in a membrane module (4) by providing, from within the module, by means (10) other than gas passing through the pores of said membranes, gas bubbles in a uniform distribution relative to the porous membrane array such that the bubbles move past the surfaces of the membranes (9) to dislodge fouling materials therefrom. The membranes (9) are arranged in close proximity to one another and mounted to prevent excessive movement therebetween. The bubbles also produce vibration and rubbing together of the membranes to further assist removal of fouling materials.

Abstract: A method of forming a reinforced urethane product having a urethane wear layer and a integral reinforcing member. A reinforcing member is formed from a woven fiber material that has a shape generally corresponding to the desired urethane product, such as a composite urethane pipe. The reinforcing member is initially stiffened through application of a sizing compound. Once stiffened, the reinforcing member is inserted into a mold and a supply of urethane is forced outward toward the inner wall of the mold cavity such that the urethane penetrates into the woven fibers of the reinforcing member. The urethane is cured in the mold and the completed reinforced urethane product is removed from the mold for use. The liquid urethane is preferably forced outward within the mold through application of either a centrifugal force or the application of positive pressure.

Abstract: A multi-layer rotational-molded plastic article has an area, such as a sight line for viewing content levels, where an inside layer protrudes through the outside layer and may be bonded to it. A first flowable material such as plastic resin is introduced into a mold having an insulating member extending through an aperture or slot into the mold. The mold is rotated and heated to less than full cure. The insulating member is removed, a second, transparent flowable material is introduced into the mold, and a cover member replaces the insulating member. The mold is rotated and heated to cure both resins, and only then cooled and opened.

Abstract: The present invention pertains to a process for the rotational molding of polyurethane composite articles. The process is carried out by placing a polyurethane composite precursor composed of a hardener, a resin and a filler, wherein the hardener comprises one or more organic di- or polyisocyanates, and the resin comprises of one or more compounds containing at least two isocyanate-reactive groups, the filler is about 15% to about 50% by weight, or alternatively, about 15% to about 35% by weight, or, in a preferred embodiment, about 25% by weight, the % weight being based upon total weight of the mixture, and either the hardener or the filler optionally contains additives and/or catalysts in a rotational mold, and rotating said mold until at least the first cure time of the molded article is completed. The invention a also pertains to the articles produced by use of this method.

Abstract: A rotomolded plastic wall and ladder structure (10, 50, or 58)), which may be an article such as a window well (10) or a manhole (50 or 58), includes a thermoplastic wall (12), a ladder (16) whose rungs (18) each include an elongated metallic core (20) and a thermoplastic sleeve (22). Mold apparatus (70) includes a thermoplastic rotomold (72), an elongated hollow metallic core (20) having a heating passage (74) therein, and means for flowing hot air through the heating passage (74). The method includes disposing the hollow metallic core in a mold, placing a quantity of a thermoplastic inside a mold, heating the mold, rotating the heated mold, flowing heated air through the hollow metallic core, and bonding a layer of the thermoplastic onto the hollow metallic core.

Abstract: Electrical circuit elements such as electrically conductive strips are permanently applied to the surface of polyolefin parts, such as polyethylene parts which are manufactured by rotational molding, by use of a transfer which can be applied to the interior surface of a rotational mold at the start of the molding cycle or can be applied to the molded part after its formation. The transfer comprises a carrier sheet on which the conductive circuit elements are printed with a mixture of wax or polyethylene powders containing from 30 to about 60 weight percent of conductive particles, preferably metal flakes. After application, the carrier sheet is removed and the conductive circuit elements are permanently incorporated into the surface of the polyethylene part by heating, either during the rotational molding cycle or by post-cycle heating of the formed part.

Abstract: A process for producing a polymer optical waveguide, including the steps of: preparing a mold comprising a concave portion for forming a core; bringing a cladding film substrate, having good adhesiveness to the mold, into close contact with the mold; rotating the mold with which the cladding film substrate is brought into close contact and with one end of which an ultraviolet ray-curable resin or a thermosetting resin to serve as a core is brought into contact, so that a centrifugal force acts in a direction to move the ultraviolet ray-curable resin or the thermosetting resin into the mold, to fill the concave portion of the mold with the ultraviolet ray-curable resin or the thermosetting resin; and curing the ultraviolet ray-curable resin or the thermosetting resin.

Abstract: A method for making rotationally molded objects using resin blends. The resin blend comprises resin pellets and an amount of ground resin powder sufficient to yield rotomolded objects having desirable impact strength and other strength characteristics. Preferably, the resin blend comprises of from about 20% to about 40% by weight of ground resin powder. The resin pellets may optionally contain a reinforcing agent. In addition, resin blends can be used to produce colored objects by rotational molding techniques.

Abstract: A variety of hollow structures with unique morphologies were manufactured with a rotational spinning technique. Phase separation of soluble solutions or emulsions was induced within a filled mold as it was being rotated about one of its axis. The density difference between phases results in sediment at the inner lumen of the mold under centrifugal forces. After or during sedimentation, gelation of the phase-separated particles fixes the hollow structure morphology and the solvent remains in the center of the mold. The solvent is removed from the mold resulting in a coating or tube. By controlling the rotational speed and the formulation chemistry, the tube dimensions and wall morphology can be manipulated. This technique offers a new approach to the manufacture of polymeric tubes. It requires small quantities of starting material, permits multi-layering of tubes, is applicable to diverse polymers and can result in highly diffusive hollow structures while maintaining good mechanical strength.

Abstract: A multi element moving vacuum chamber (MEMVC) for rotational casting includes a mold having a predefined shape and an axis of rotation, and a box containing casting material. The MEMVC further includes a first vacuum element mounted to an outer mold surface and a second vacuum element mounted to an outer box surface. The mold and the box are detachably engageable with each other to define an engaged configuration in which air present in an enclosed area defined by the outer mold surface and an inner surface of the first vacuum element, by an inner mold surface and an inner box surface, and by the outer box surface and an inner surface of the second vacuum element, is removed to create a vacuum. Alternatively, the mold and/or the box may be constructed with vacuum loading capability, thereby eliminating the need for the first and/or the second vacuum elements.

Abstract: Cylindrical castings (174), suited to thermal insulation applications at high temperatures, are formed by a centrifugal casting process. A mixture of carbon-containing fibers, such as isotropic pitch fibers, and a suitable aqueous binder, such as a sugar solution, is supplied to a rotating drum (12). The mixture is supplied via a feed pipe (18) concentrically aligned with a screen (66) of the drum. The fibers and binder collect on a filter cloth (102) supported by an inner surface of the screen. Excess binder flows through the filter cloth and passes through adjacent apertures (100) in the screen. When a cylindrical preform of sufficient thickness has built up, the drum is disassembled. The preform is dried, to drive off excess water, and heated to a temperature of about 900° C.-2000° C. to form the casting.

Abstract: A centrifugal casting die according to the present invention includes a cylindrical die body, a backup layer releasably bonded to the inner surface 12b of the die body, and a top layer bonded to be integral to the inner surface of the backup layer, for holding a centrifugally casting material supplied to the inner surface thereof, whereby the centrifugally casting material having a uniform thickness is easily releasable from the centrifugal casting die without using a die-lubricant.

Abstract: A film is made of an insulating matrix resin and an electroconductive material, in which the electroconductive material is dispersed in the insulating matrix resin in such a manner that a surface resistivity of A [&OHgr;] of the film and a volume resistivity of B [&OHgr;·cm] of the film in the direction of a thickness thereof normal to the surface of the film satisfy a relationship of: A>B, and when the film has a thickness of T [cm], the electroconductive material is dispersed in the insulating matrix resin in such a manner that the surface resistivity of A [&OHgr;] of the film and the volume resistivity of B [&OHgr;·cm] of the film satisfy a relationship of; A[&OHgr;]'T [cm]>B [&OHgr;·cm]. This film can be prepared by a centrifugal molding method.

Abstract: The subject of the invention is a method of manufacturing centrifuged, glass fiber-reinforced synthetic material pipes wherein liquid, curable resin, which contains a filler, together with glass fibers, additives for the curing process, possibly also with sand, is introduced into a rotating mould and the temperature of the mould is between 40° C. and 75° C. as the raw materials are introduced. The resin used in the layers in the outer region of the pipe has a gel time which is equal to or greater than the gel time of the resin used for the inner region of the pipe and the resin comprising a filler content of at least 40% is used. Furthermore, once the exothermal reaction has commenced, warm water is sprayed onto the mould in order to maintain the temperature of the mould at least at 60° C. until the pipe is removed.

Abstract: A plastic particle is formed of a plastic material having at least one integral protruding ring disposed on its outer surface. The ring may be continuous or intermittent around a perimeter of the plastic particle. Preferably, the particles have an outer diameter in the range of 0.007 inches to 0.040 inches.

Abstract: A plasticizing barrel for a plastics processing machine includes a body having a hollow cylindrical configuration and defining an axis; and a coating formed on an inner wall surface of the body and including at least one groove extending in axial direction of the body. The coating, e.g., a wear-resisting protective layer, may be produced through centrifugal casting, whereby the grooves are formed by projections of a negative mold inserted in the hollow-cylindrical body.

Abstract: A system and method for molding the shell of a medical device or other molded article is provided. The system includes a multi-axis rotational molding machine in which a mold is mounted. The mold has a cavity in the shape of the article to be molded. The mold seals to hold a vacuum. In operation, silicone or other molding material is inserted into the mold, vacuum is applied to the mold, the mold is rotated about at least two axes and a molding material coats the inside walls of the mold to form the shell or other desired article. A rotationally molded medical article is also provided.

Abstract: A method for rotational molding uses a mold having first and second mold components defining therebetween a mold cavity. The first mold component includes a mold insert adapted to translate toward the second mold component. A spring-biased latch mechanism restrains the mold insert in the outward disposition, and a touch pad is struck to trigger the latch mechanism and urge the mold inwardly while the mold is rotating. In another aspect, the invention includes a method for rotational molding that employs the rotational mold described above. With the mold insert latched in the outward disposition, the rotational mold charged with thermoplastic material rotated biaxially and heated. After heating, while the mold assembly continues to rotate, the touch pad is struck to release the latch and cause the mold insert to move inwardly. The mold insert includes structural features that are moved more proximate to opposed mold portions.

Abstract: A process for manufacturing a capital for an architectural column. The inside of a mold for an architectural column is lightly coated with a mold release. A first opening of the mold is placed upon a surface, and a plug is positioned on the surface within the first opening. Through another opening foam is poured around the plug. After the foam has hardened, the mold is removed from the surface. All other openings in the mold are securely covered. Then an elastomer is introduced into the mold, and the mold is rotated about three different axes. The introduction of the elastomer is repeated after the prior coating created by the introduced elastomer has become tacky but before the prior coating has become firm. After the final coating of elastomer has become tacky but not firm, foam is introduced into the mold.

Abstract: The invention relates to a method and installation for the purpose of manufacturing centrifuged glass fibre-reinforced synthetic material pipes, wherein liquid curable resin, which can contain a filler, together with glass fibres and additives for the curing process, possibly also with sand, is introduced into a rotating mould. With respect to the mould temperature as the raw materials are introduced, the quantity and type of additives are adapted in a successive manner such that gelling commences in the outer part of the pipe when the last part of the raw materials is introduced. Upon gelling, the temperature is lower in the outer part than in the inner part and gelling only commences in the inner part of the pipe after all of the raw materials have been introduced.