Abstract:
A process is disclosed to eliminate or diminish oxygen inhibition of the curing of coating resins in the composite industry. A free radical curable coating is applied to a mold surface and an inert gas is used to protect the coatings from oxygen in the air during the cure. The inert gases can be, but are not limited to, nitrogen gas and carbon dioxide gas. The inert gas or mold or both can be heated to a temperature above room temperature.
Abstract:
Method is disclosed including thermally processing a scaffold to increase the radial strength of the scaffold when the scaffold is deployed from a crimped state to a deployed state such as a nominal deployment diameter. The thermal processing may further maintain or increase the expansion capability of the scaffold when expanded beyond the nominal diameter.
Abstract:
Contact lens curing systems and methods are described. A contact lens curing system includes an oven that has a plurality of curing zones, a mold advancement system for moving the contact lens mold assemblies between the plurality of zones, and a controlled atmosphere within the curing zones that provides a substantially chemically inert environment in which contact lens precursor materials can be polymerized in contact lens mold assemblies located in the curing zones. Methods of producing contact lenses include curing contact lens precursor materials in contact lens mold assemblies in the lens curing system. As an example, an oven for curing contact precursor materials in molds, the curing process being done in an inert atmosphere, includes a plurality of heating zones, such as three heating zones 106, 107, 108 or two heating zones 307, 308 and a mold advancement system for moving the molds between the plurality of zones, wherein a first zone and second zone of the plurality of zones are maintained at different temperatures 106, 107 or 307, 308.
Abstract:
Method is disclosed including thermally processing a scaffold to increase the radial strength of the scaffold when the scaffold is deployed from a crimped state to a deployed state such as a nominal deployment diameter. The thermal processing may further maintain or increase the expansion capability of the scaffold when expanded beyond the nominal diameter.
Abstract:
It is disclosed a method and an apparatus for moulding and curing a tyre for vehicle wheels, said method comprising the steps of : building a green tyre on a toroidal support (10) having an outer surface the shape of which substantially matches that of an inter surface of said green tyre; placing said green tyre carried by said toroidal support (10) into a moulding cavity (104) defined in a vulcanization mould (102), said moulding cavity (104) having walls conforming in shape to an outer surface of said tyre when vulcanization has been completed; pressing an outer surface of said green tyre against the walls of said moulding cavity (104) by means of a working fluid under pressure flowing in at least one diffusion gap between said outer surface of said toroidal support (10) and said inner surface of said green tyre; heating said working fluid under pressure so as to supply heat to said green tyre in order to enable vulcanization of same, wherein said working fluid under pressure in contact with said green tyre is submitted to circulation.
Abstract:
A method for forming and curing an uncured tire-curing bladder with a bladder-curing bladder includes providing an uncured tire-curing bladder having an inner and outer surface on or in a recess of an outer-surface curing mold; inflating the bladder-curing bladder into the recess and exerting pressure on the inner surface of the uncured tire-curing bladder; and curing the uncured tire-curing bladder by providing heat, pressure, or both to the inner surface and the outer surface of the tire-curing bladder to form a cured tire-curing bladder. A thin tire-curing bladder and a curing apparatus are also provided.
Abstract:
L'invention concerne un procédé spécifique de fabrication d'une pièce de matériau composite thermoplastique comprenant un renfort fibreux et une matrice de polymère thermoplastique à base d'un polymère thermoplastique imprégnant ledit renfort fibreux lequel comprend: a) une étape d'imprégnation dudit renfort fibreux sec, par injection sur ledit renfort, à une température d'injection T1 supérieure à HDT dudit matériau composite si la matrice est amorphe et supérieure à Tf si ledit matériau est semi-cristallin, d'une composition réactive p) précurseur dudit polymère, à base de prépolymère réactif dudit polymère thermoplastique, et moulage, avec l'étape de polymérisation b) étant simultanée avec l'étape d'imprégnation et de moulage et avec la température de régulation T2 dudit moule étant maintenue constante pendant tout le cycle de moulage à une valeur inférieure à la HDT dudit matériau composite lorsque sa matrice est composée d'un polymère amorphe et à une valeur entre Tc et Tc-20°C pour une matrice semi-cristalline, et avec un réchauffage de la surface interne du moule, juste avant ladite injection, à une température T3 comprise entre T1-50°C et T1+50°C, par un moyen de chauffage externe au moule et amovible avec c) démoulage de la pièce quand sa température T4 est égale à T2, et d) éventuelle poursuite de la polymérisation, si partielle au démoulage, dans une étape séparée hors moule, par recuit dans une étuve à une température de recuit Tr
Abstract:
It is disclosed a method and an apparatus for moulding and curing a tyre for vehicle wheels, said method comprising the steps of : building a green tyre on a toroidal support (10) having an outer surface the shape of which substantially matches that of an inter surface of said green tyre; placing said green tyre carried by said toroidal support (10) into a moulding cavity (104) defined in a vulcanization mould (102), said moulding cavity (104) having walls conforming in shape to an outer surface of said tyre when vulcanization has been completed; pressing an outer surface of said green tyre against the walls of said moulding cavity (104) by means of a working fluid under pressure flowing in at least one diffusion gap between said outer surface of said toroidal support (10) and said inner surface of said green tyre; heating said working fluid under pressure so as to supply heat to said green tyre in order to enable vulcanization of same, wherein said working fluid under pressure in contact with said green tyre is submitted to circulation.