Plastic composite insulator with spiral shield and process for p

Details Plastic composite insulator with spiral shield and process for p Plastic composite insulator with spiral shield and process for p

1997-07-22

1999-07-20

Ramirez, Nestor

Electricity: conductors and insulators

Insulators

With terminal elements

174212, H01B 1706

Patent

active

059258551

ABSTRACT:
A plastic composite insulator (1) including a shank (2) and at least one shield and caps (19), in which the shank comprises a fiber-reinforced plastic core (3) and, around this core, a jacket (5) of a shielding sheath (4) and in which the shielding sheath is formed by the jacket and at least one shield (6) running spirally around the shank, wherein the shielding sheath is formed in one part and without joints.
A process for producing a plastic composite insulator in which an adhesion promoter is applied to a fiber-reinforced plastic core (3), the plastic core pretreated in this way being introduced into an extruder (21) or into a ram press, which have a side-fed die (22) with a rotatable die ring (23), the transporting speed of the plastic core is coupled with the rotating speed of the die ring, the composition (24) for producing the shielding sheath (4) is compressed around the pretreated plastic core and is forced through the rotatable die ring, so that the pretreated plastic core is provided in the longitudinal direction with a shielding sheath including a jacket and a shield/shields in the form of a spiral. A rotating device may be used on the transporting device instead of on the die ring.

REFERENCES:
patent: 3003022 (1961-10-01), Meier
patent: 3257501 (1966-06-01), Sauer
patent: 3685147 (1972-08-01), Nevin et al.
patent: 4246696 (1981-01-01), Bauer et al.
patent: 4375527 (1983-03-01), Zahner
patent: 4833278 (1989-05-01), Lambeth
patent: 5223190 (1993-06-01), Vallauri et al.

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