摘要:
A method of fabricating a preformed core material by utilizing a particulate preform process. The particulate core material is combined with an adhesive binder and deposited upon a porous surface (6), through which air is drawn, having the desired preform shape. Once the adhesive sets the deposited layer of core material is removed from the porous surface (6) and may be used as a core in a closed molding process. This method may also be used to fabricate a preformed laminate by depositing layers of fiber material before and/or after a core material is deposited.
摘要:
Dispositif de rotomoulage comprenant une première tourelle 11 porte-moules, et une deuxième tourelle 12 supportant des bacs à poudre plastique. Au poste de poudrage 13, un bac à poudre de la deuxième tourelle 12 est accouplé à un cadre 22 de réception du moule de la première tourelle 11, et l'ensemble est entraîné en rotation autour d'un axe longitudinal 23, de manière à répartir la poudre dans le moule préalablement chauffé. Un palier 24 escamotable est monté à pivotement entre une position inactive, et une position active dans laquelle il coopère avec un embout 27 du cadre 22 pour le redresser indépendamment de la flèche due au montage en porte-à-faux. Des moyens de percussion 35 sont aptes à transmettre une multitude de chocs mécaniques sur le cadre 22 du moule pendant la rotation avec le bac à poudre, et en position active du palier 24. Application : moulage de pièces plastiques à parois minces.
摘要:
A variety of hollow structures with unique morphologies were manufactured with a rotational spinning technique. Phase separation of soluble solutions was induced within a filled mold as it was being rotated about one of its axis. As phase-separation occurs within this rotating mold, the increase in density of one phase results in sediment at the periphery under centrifugal forces. After or during sedimentation, gelation of the phase-separated particles fixes the tube morphology and the solvent remains in the center of the mold. The solvent is removed from the mold resulting in a 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.
摘要:
A system and method for molding the shell of a medical device or other molded article is disclosed. The system includes a multi-axis rotational molding machine (50) in which a mold (100) is mounted. The mold (100) has a cavity (60) in the shape of the article to be molded. The mold (100) seals to hold a vacuum. In operation, silicone or other molding material is inserted into the mold (100), vacuum is applied to the mold (100), the mold (100) is rotated about at least two axes (A, B) and a molding material coats the inside walls of the mold (100) to form the shell or other desired article. A rotationally molded medical article is also disclosed.
摘要:
A method of the manufacture of an optical lens element. The method comprises providing a fixable liquid (A) separated from a different liquid (B) by a meniscus (12); varying a curvature of the separating meniscus (12) and fixing the shape of the fixable liquid when the curvature has a desired configuration.
摘要:
The present invention discloses a generic method for producing void and gas occlusion free materials, as well as apparatuses for batch and continuous production of same. This generic method can be utilized in the production of a wide variety of polymeric compounds and composites and specifically encompasses the two ends of the polymeric composite spectrum, that is, polymer concretes on the one hand, and fiber-reinforced polymer composites on the other. The composite materials of the present invention are characterized by visual count as being void and gas occlusion free to the level of 1 micron at 1250x magnification. Concomitantly, the invention produces useful polymer concrete materials which exhibit substantially improved integrity for easy machining at high speeds, and high dielectric and mechanical strength, as compared with composite materials produced by conventional methods. Thus, one particularly well-suited application for the materials of the present invention is the class of high voltage electrical insulating materials and insulators where the presence of voids, or gas occlusion flaws, may have deleterious effects, leading to their early failure.