Method and device for producing an electric insulator made from plastic

A method for producing an electric insulator made of plastic, the insulator having a centrally arranged core, and having a plurality of insulation screens arranged coaxially around the core in an offset manner in an axial direction of the core, the steps comprising:

• positioning a casting mold in an axial position around a vertically arranged core, the casting mold having a coaxial opening arranged in an axially lower area of the casting mold, and having a mold area, open at the top, where an insulation screen is constructed;
• producing a sealing connection between the core and the casting mold in an axially lower area of the casting mold;
• injecting a liquid plastic material under pressure into an axial area of the casting mold until the casting mold is filled, such axial area being above the sealing connection and below an upper end of the casting mold;
• curing the liquid plastic material in the casting mold, thereby creating an insulation screen;
• deactivating the sealing connection;
• displacing the casting mold axially in a downward direction along a defined displacement path;
• and
• repeating the above steps until an insulator is produced having a desired number of insulation screens.