Method and device for producing an electric insulator made...

B - Operations – Transporting – 29 – C

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Details

B29C 39/02 (2006.01) B29C 33/00 (2006.01) B29C 39/10 (2006.01) B29C 39/24 (2006.01) B29C 70/70 (2006.01) B29C 31/04 (2006.01)

Patent

CA 2439975

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 addition 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 the 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 casting mould (4); c) injecting a liquid plastic material at a pressure (pe) which is higher than the ambient pressure (p0) in an axial section (10) of the casting mould (4), which is arranged axially above the tight connection (8) and axially below the upper end (11) of the casting mould (4).

L'invention concerne un procédé et un dispositif pour produire un isolateur électrique (1) en matière plastique, comprenant un noyau creux central (2) ainsi qu'une pluralité d'écrans d'isolation (3) placés de manière coaxiale autour du noyau creux (2) et décalés dans le sens axial de ce dernier (2). L'objectif de l'invention est d'améliorer la production d'un tel isolateur électrique (1) en matière plastique. A cet effet, le procédé selon l'invention comprend essentiellement les étapes suivantes : a) installation d'un moule (4) dans une position axiale prédéterminée autour du noyau creux (2) placé verticalement, ce moule (4) présentant une ouverture coaxiale (5) située dans une zone inférieure (6), dans le sens axial, du moule (4), ainsi qu'une zone de moule (7) ouverte vers le haut servant à former un écran d'isolation (3) ; b) création d'une liaison étanche (8) entre le noyau creux (2) et le moule (4) dans une zone inférieure (9), dans le sens axial, du moule (4) ; c) injection d'une matière plastique liquide à une pression (p¿e?) supérieure à la pression ambiante (p¿0?) dans une zone axiale (10) du moule (4), qui se situe axialement au-dessus de la liaison étanche (8) et sous l'extrémité supérieure (11) du moule (4).

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