Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1992-01-29
1993-06-29
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264264, 26427215, 264278, 264279, 264318, 425111, 425118, 425150, B29C 4580
Patent
active
052231909
ABSTRACT:
A process and an apparatus to make composite insulators, consisting of a central core (3) provided with an insulating coating (4) of elastomeric material, for electric overhead lines. The apparatus comprises a base structure (6) to which a first and a second end pieces (5a, 5b) of the core (3) are respectively fastened by a bracket (7a), and two injection mould halves (8a) designed to be moved close to each other. Mounted to the base structure (6) are at least two forming mould halves (9a, 9b) arranged to define a filling housing (9c) around the core (3). An injection nozzle (11) communicates with a conveying hollow space (12) coaxial with the central core (3), which is formed between the injection mould halves (8a) and a containing sleeve (13) mounted on the second end piece (5b). The conveying hollow space (12) is directly in communication with the filling housing (9c) so that the injection flow of the elastomeric material takes place in an axial direction relative to the central core (3), which will avoid side bendings of the central core itself. The process includes the use of a load cell (24) and a fluid-operated actuator (25) operate between the bracket (7a) and base structure (6) for applying a mechanical tractive action to the central core (3), adapted to counteract the core deflection by effect of anomalous thrusts exerted by the elastomeric material during the injection step.
REFERENCES:
patent: 2197465 (1940-04-01), Brunetti
patent: 3109201 (1963-11-01), Dulmage
patent: 3380120 (1968-04-01), Rowland et al.
patent: 3385553 (1968-05-01), Braun
patent: 4318879 (1982-03-01), Gartner
Conference Internationale Sur Les Grandes Reseaux Electriques (Cigre) 1978 15-10, 1980 22-10 and 22-11, 1986 15-12, 1988 15-17 L'Energia Elettrica No. 1, 1983--pp. 36-46.
Lignes Aeriennes: Cables, Conducteurs, Isolateurs et Accessoires journees d'etudes Mar. 21, 1990.
Le Linee Elettriche, La Normativa, La Relazione Con L'Ambiente, GLI Sviluppi Tecnologici giornate di studio Nov. 15, 1988.
Portas Francesco
Vallauri Ubaldo
Heitbrink Jill L.
Pirelli Cavi S.p.A.
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