METHOD AND DEVICE FOR PRODUCING AN ELECTRIC INSULATOR MADE FROM PLASTIC

摘要

The invention relates to a method and a device for producing an electric insulator (1) made of plastic comprising a central hollow core (2) in additi on to a plurality of insulating screens (3) which are arranged in a coaxial manner around the hollow core (2) and which are disposed in the axial direction of said hollow core (2). The aim of the invention is to improve th e production of said plastic insulator (1) by using a method comprising, essentially, the following steps: a) placing a casting mould (4) on a predetermined axial position around the vertically arranged hollow core (2), the casting mould (4) having a coaxial opening (5) which is arranged in an axial manner in a lower section (6) of the casting mould (4), and a superior section (7) being open towards the top for forming an insulating screen (3); b) producing a tight connection (8) between the hollow core (2) and the casting mould (4) in a lower section (9) in the axial direction of the casti ng mould (4); c) injecting a liquid plastic material at a pressure (pe) which i s higher than the ambient pressure (p0) in an axial section (10) of the castin g mould (4), which is arranged axially above the tight connection (8) and axially below the upper end (11) of the casting mould (4).